Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb | 53 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 54 | static LIST_HEAD(regulator_map_list); |
f19b00da | 55 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 56 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 57 | static bool has_full_constraints; |
414c70cb | 58 | |
1130e5b3 | 59 | static struct dentry *debugfs_root; |
1130e5b3 | 60 | |
85f3b431 TV |
61 | static struct class regulator_class; |
62 | ||
8dc5390d | 63 | /* |
414c70cb LG |
64 | * struct regulator_map |
65 | * | |
66 | * Used to provide symbolic supply names to devices. | |
67 | */ | |
68 | struct regulator_map { | |
69 | struct list_head list; | |
40f9244f | 70 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 71 | const char *supply; |
a5766f11 | 72 | struct regulator_dev *regulator; |
414c70cb LG |
73 | }; |
74 | ||
f19b00da KM |
75 | /* |
76 | * struct regulator_enable_gpio | |
77 | * | |
78 | * Management for shared enable GPIO pin | |
79 | */ | |
80 | struct regulator_enable_gpio { | |
81 | struct list_head list; | |
778b28b4 | 82 | struct gpio_desc *gpiod; |
f19b00da KM |
83 | u32 enable_count; /* a number of enabled shared GPIO */ |
84 | u32 request_count; /* a number of requested shared GPIO */ | |
85 | unsigned int ena_gpio_invert:1; | |
86 | }; | |
87 | ||
a06ccd9c CK |
88 | /* |
89 | * struct regulator_supply_alias | |
90 | * | |
91 | * Used to map lookups for a supply onto an alternative device. | |
92 | */ | |
93 | struct regulator_supply_alias { | |
94 | struct list_head list; | |
95 | struct device *src_dev; | |
96 | const char *src_supply; | |
97 | struct device *alias_dev; | |
98 | const char *alias_supply; | |
99 | }; | |
100 | ||
414c70cb | 101 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 102 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
103 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
104 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
105 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 106 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 107 | unsigned long event, void *data); |
75790251 MB |
108 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
109 | int min_uV, int max_uV); | |
3801b86a MB |
110 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
111 | struct device *dev, | |
112 | const char *supply_name); | |
36a1f1b6 | 113 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 114 | |
609ca5f3 MB |
115 | static struct regulator_dev *dev_to_rdev(struct device *dev) |
116 | { | |
117 | return container_of(dev, struct regulator_dev, dev); | |
118 | } | |
414c70cb | 119 | |
1083c393 MB |
120 | static const char *rdev_get_name(struct regulator_dev *rdev) |
121 | { | |
122 | if (rdev->constraints && rdev->constraints->name) | |
123 | return rdev->constraints->name; | |
124 | else if (rdev->desc->name) | |
125 | return rdev->desc->name; | |
126 | else | |
127 | return ""; | |
128 | } | |
129 | ||
87b28417 MB |
130 | static bool have_full_constraints(void) |
131 | { | |
75bc9641 | 132 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
133 | } |
134 | ||
8a34e979 WP |
135 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
136 | { | |
137 | if (!rdev->constraints) { | |
138 | rdev_err(rdev, "no constraints\n"); | |
139 | return false; | |
140 | } | |
141 | ||
142 | if (rdev->constraints->valid_ops_mask & ops) | |
143 | return true; | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
70a7fb80 TR |
148 | static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev) |
149 | { | |
150 | if (rdev && rdev->supply) | |
151 | return rdev->supply->rdev; | |
152 | ||
153 | return NULL; | |
154 | } | |
155 | ||
9f01cd4a SH |
156 | /** |
157 | * regulator_lock_supply - lock a regulator and its supplies | |
158 | * @rdev: regulator source | |
159 | */ | |
160 | static void regulator_lock_supply(struct regulator_dev *rdev) | |
161 | { | |
fa731ac7 | 162 | int i; |
9f01cd4a | 163 | |
70a7fb80 | 164 | for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++) |
fa731ac7 | 165 | mutex_lock_nested(&rdev->mutex, i); |
9f01cd4a SH |
166 | } |
167 | ||
168 | /** | |
169 | * regulator_unlock_supply - unlock a regulator and its supplies | |
170 | * @rdev: regulator source | |
171 | */ | |
172 | static void regulator_unlock_supply(struct regulator_dev *rdev) | |
173 | { | |
174 | struct regulator *supply; | |
175 | ||
176 | while (1) { | |
177 | mutex_unlock(&rdev->mutex); | |
178 | supply = rdev->supply; | |
179 | ||
180 | if (!rdev->supply) | |
181 | return; | |
182 | ||
183 | rdev = supply->rdev; | |
184 | } | |
185 | } | |
186 | ||
69511a45 RN |
187 | /** |
188 | * of_get_regulator - get a regulator device node based on supply name | |
189 | * @dev: Device pointer for the consumer (of regulator) device | |
190 | * @supply: regulator supply name | |
191 | * | |
192 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 193 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
194 | * returns NULL. |
195 | */ | |
196 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
197 | { | |
198 | struct device_node *regnode = NULL; | |
199 | char prop_name[32]; /* 32 is max size of property name */ | |
200 | ||
201 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
202 | ||
203 | snprintf(prop_name, 32, "%s-supply", supply); | |
204 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
205 | ||
206 | if (!regnode) { | |
16fbcc3b | 207 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
208 | prop_name, dev->of_node->full_name); |
209 | return NULL; | |
210 | } | |
211 | return regnode; | |
212 | } | |
213 | ||
414c70cb LG |
214 | /* Platform voltage constraint check */ |
215 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
216 | int *min_uV, int *max_uV) | |
217 | { | |
218 | BUG_ON(*min_uV > *max_uV); | |
219 | ||
8a34e979 | 220 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 221 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
222 | return -EPERM; |
223 | } | |
224 | ||
225 | if (*max_uV > rdev->constraints->max_uV) | |
226 | *max_uV = rdev->constraints->max_uV; | |
227 | if (*min_uV < rdev->constraints->min_uV) | |
228 | *min_uV = rdev->constraints->min_uV; | |
229 | ||
89f425ed MB |
230 | if (*min_uV > *max_uV) { |
231 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 232 | *min_uV, *max_uV); |
414c70cb | 233 | return -EINVAL; |
89f425ed | 234 | } |
414c70cb LG |
235 | |
236 | return 0; | |
237 | } | |
238 | ||
05fda3b1 TP |
239 | /* Make sure we select a voltage that suits the needs of all |
240 | * regulator consumers | |
241 | */ | |
242 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
243 | int *min_uV, int *max_uV) | |
244 | { | |
245 | struct regulator *regulator; | |
246 | ||
247 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
248 | /* |
249 | * Assume consumers that didn't say anything are OK | |
250 | * with anything in the constraint range. | |
251 | */ | |
252 | if (!regulator->min_uV && !regulator->max_uV) | |
253 | continue; | |
254 | ||
05fda3b1 TP |
255 | if (*max_uV > regulator->max_uV) |
256 | *max_uV = regulator->max_uV; | |
257 | if (*min_uV < regulator->min_uV) | |
258 | *min_uV = regulator->min_uV; | |
259 | } | |
260 | ||
dd8004af | 261 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
262 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
263 | *min_uV, *max_uV); | |
05fda3b1 | 264 | return -EINVAL; |
dd8004af | 265 | } |
05fda3b1 TP |
266 | |
267 | return 0; | |
268 | } | |
269 | ||
414c70cb LG |
270 | /* current constraint check */ |
271 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
272 | int *min_uA, int *max_uA) | |
273 | { | |
274 | BUG_ON(*min_uA > *max_uA); | |
275 | ||
8a34e979 | 276 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 277 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
278 | return -EPERM; |
279 | } | |
280 | ||
281 | if (*max_uA > rdev->constraints->max_uA) | |
282 | *max_uA = rdev->constraints->max_uA; | |
283 | if (*min_uA < rdev->constraints->min_uA) | |
284 | *min_uA = rdev->constraints->min_uA; | |
285 | ||
89f425ed MB |
286 | if (*min_uA > *max_uA) { |
287 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 288 | *min_uA, *max_uA); |
414c70cb | 289 | return -EINVAL; |
89f425ed | 290 | } |
414c70cb LG |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /* operating mode constraint check */ | |
2c608234 | 296 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 297 | { |
2c608234 | 298 | switch (*mode) { |
e573520b DB |
299 | case REGULATOR_MODE_FAST: |
300 | case REGULATOR_MODE_NORMAL: | |
301 | case REGULATOR_MODE_IDLE: | |
302 | case REGULATOR_MODE_STANDBY: | |
303 | break; | |
304 | default: | |
89f425ed | 305 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
306 | return -EINVAL; |
307 | } | |
308 | ||
8a34e979 | 309 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 310 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
311 | return -EPERM; |
312 | } | |
2c608234 MB |
313 | |
314 | /* The modes are bitmasks, the most power hungry modes having | |
315 | * the lowest values. If the requested mode isn't supported | |
316 | * try higher modes. */ | |
317 | while (*mode) { | |
318 | if (rdev->constraints->valid_modes_mask & *mode) | |
319 | return 0; | |
320 | *mode /= 2; | |
414c70cb | 321 | } |
2c608234 MB |
322 | |
323 | return -EINVAL; | |
414c70cb LG |
324 | } |
325 | ||
414c70cb LG |
326 | static ssize_t regulator_uV_show(struct device *dev, |
327 | struct device_attribute *attr, char *buf) | |
328 | { | |
a5766f11 | 329 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
330 | ssize_t ret; |
331 | ||
332 | mutex_lock(&rdev->mutex); | |
333 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
334 | mutex_unlock(&rdev->mutex); | |
335 | ||
336 | return ret; | |
337 | } | |
7ad68e2f | 338 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
339 | |
340 | static ssize_t regulator_uA_show(struct device *dev, | |
341 | struct device_attribute *attr, char *buf) | |
342 | { | |
a5766f11 | 343 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
344 | |
345 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
346 | } | |
7ad68e2f | 347 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 348 | |
587cea27 GKH |
349 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
350 | char *buf) | |
bc558a60 MB |
351 | { |
352 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 353 | |
1083c393 | 354 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 355 | } |
587cea27 | 356 | static DEVICE_ATTR_RO(name); |
bc558a60 | 357 | |
4fca9545 | 358 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 359 | { |
414c70cb LG |
360 | switch (mode) { |
361 | case REGULATOR_MODE_FAST: | |
362 | return sprintf(buf, "fast\n"); | |
363 | case REGULATOR_MODE_NORMAL: | |
364 | return sprintf(buf, "normal\n"); | |
365 | case REGULATOR_MODE_IDLE: | |
366 | return sprintf(buf, "idle\n"); | |
367 | case REGULATOR_MODE_STANDBY: | |
368 | return sprintf(buf, "standby\n"); | |
369 | } | |
370 | return sprintf(buf, "unknown\n"); | |
371 | } | |
372 | ||
4fca9545 DB |
373 | static ssize_t regulator_opmode_show(struct device *dev, |
374 | struct device_attribute *attr, char *buf) | |
414c70cb | 375 | { |
a5766f11 | 376 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 377 | |
4fca9545 DB |
378 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
379 | } | |
7ad68e2f | 380 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
381 | |
382 | static ssize_t regulator_print_state(char *buf, int state) | |
383 | { | |
414c70cb LG |
384 | if (state > 0) |
385 | return sprintf(buf, "enabled\n"); | |
386 | else if (state == 0) | |
387 | return sprintf(buf, "disabled\n"); | |
388 | else | |
389 | return sprintf(buf, "unknown\n"); | |
390 | } | |
391 | ||
4fca9545 DB |
392 | static ssize_t regulator_state_show(struct device *dev, |
393 | struct device_attribute *attr, char *buf) | |
394 | { | |
395 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
396 | ssize_t ret; |
397 | ||
398 | mutex_lock(&rdev->mutex); | |
399 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
400 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 401 | |
9332546f | 402 | return ret; |
4fca9545 | 403 | } |
7ad68e2f | 404 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 405 | |
853116a1 DB |
406 | static ssize_t regulator_status_show(struct device *dev, |
407 | struct device_attribute *attr, char *buf) | |
408 | { | |
409 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
410 | int status; | |
411 | char *label; | |
412 | ||
413 | status = rdev->desc->ops->get_status(rdev); | |
414 | if (status < 0) | |
415 | return status; | |
416 | ||
417 | switch (status) { | |
418 | case REGULATOR_STATUS_OFF: | |
419 | label = "off"; | |
420 | break; | |
421 | case REGULATOR_STATUS_ON: | |
422 | label = "on"; | |
423 | break; | |
424 | case REGULATOR_STATUS_ERROR: | |
425 | label = "error"; | |
426 | break; | |
427 | case REGULATOR_STATUS_FAST: | |
428 | label = "fast"; | |
429 | break; | |
430 | case REGULATOR_STATUS_NORMAL: | |
431 | label = "normal"; | |
432 | break; | |
433 | case REGULATOR_STATUS_IDLE: | |
434 | label = "idle"; | |
435 | break; | |
436 | case REGULATOR_STATUS_STANDBY: | |
437 | label = "standby"; | |
438 | break; | |
f59c8f9f MB |
439 | case REGULATOR_STATUS_BYPASS: |
440 | label = "bypass"; | |
441 | break; | |
1beaf762 KG |
442 | case REGULATOR_STATUS_UNDEFINED: |
443 | label = "undefined"; | |
444 | break; | |
853116a1 DB |
445 | default: |
446 | return -ERANGE; | |
447 | } | |
448 | ||
449 | return sprintf(buf, "%s\n", label); | |
450 | } | |
451 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
452 | ||
414c70cb LG |
453 | static ssize_t regulator_min_uA_show(struct device *dev, |
454 | struct device_attribute *attr, char *buf) | |
455 | { | |
a5766f11 | 456 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
457 | |
458 | if (!rdev->constraints) | |
459 | return sprintf(buf, "constraint not defined\n"); | |
460 | ||
461 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
462 | } | |
7ad68e2f | 463 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
464 | |
465 | static ssize_t regulator_max_uA_show(struct device *dev, | |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
a5766f11 | 468 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
469 | |
470 | if (!rdev->constraints) | |
471 | return sprintf(buf, "constraint not defined\n"); | |
472 | ||
473 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
474 | } | |
7ad68e2f | 475 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
476 | |
477 | static ssize_t regulator_min_uV_show(struct device *dev, | |
478 | struct device_attribute *attr, char *buf) | |
479 | { | |
a5766f11 | 480 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
481 | |
482 | if (!rdev->constraints) | |
483 | return sprintf(buf, "constraint not defined\n"); | |
484 | ||
485 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
486 | } | |
7ad68e2f | 487 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
488 | |
489 | static ssize_t regulator_max_uV_show(struct device *dev, | |
490 | struct device_attribute *attr, char *buf) | |
491 | { | |
a5766f11 | 492 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
493 | |
494 | if (!rdev->constraints) | |
495 | return sprintf(buf, "constraint not defined\n"); | |
496 | ||
497 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
498 | } | |
7ad68e2f | 499 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
500 | |
501 | static ssize_t regulator_total_uA_show(struct device *dev, | |
502 | struct device_attribute *attr, char *buf) | |
503 | { | |
a5766f11 | 504 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
505 | struct regulator *regulator; |
506 | int uA = 0; | |
507 | ||
508 | mutex_lock(&rdev->mutex); | |
509 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 510 | uA += regulator->uA_load; |
414c70cb LG |
511 | mutex_unlock(&rdev->mutex); |
512 | return sprintf(buf, "%d\n", uA); | |
513 | } | |
7ad68e2f | 514 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 515 | |
587cea27 GKH |
516 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
517 | char *buf) | |
414c70cb | 518 | { |
a5766f11 | 519 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
520 | return sprintf(buf, "%d\n", rdev->use_count); |
521 | } | |
587cea27 | 522 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 523 | |
587cea27 GKH |
524 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
525 | char *buf) | |
414c70cb | 526 | { |
a5766f11 | 527 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
528 | |
529 | switch (rdev->desc->type) { | |
530 | case REGULATOR_VOLTAGE: | |
531 | return sprintf(buf, "voltage\n"); | |
532 | case REGULATOR_CURRENT: | |
533 | return sprintf(buf, "current\n"); | |
534 | } | |
535 | return sprintf(buf, "unknown\n"); | |
536 | } | |
587cea27 | 537 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
538 | |
539 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
540 | struct device_attribute *attr, char *buf) | |
541 | { | |
a5766f11 | 542 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 543 | |
414c70cb LG |
544 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
545 | } | |
7ad68e2f DB |
546 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
547 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
548 | |
549 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
550 | struct device_attribute *attr, char *buf) | |
551 | { | |
a5766f11 | 552 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 553 | |
414c70cb LG |
554 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
555 | } | |
7ad68e2f DB |
556 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
557 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
558 | |
559 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
560 | struct device_attribute *attr, char *buf) | |
561 | { | |
a5766f11 | 562 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 563 | |
414c70cb LG |
564 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
565 | } | |
7ad68e2f DB |
566 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
567 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 568 | |
414c70cb LG |
569 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
a5766f11 | 572 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 573 | |
4fca9545 DB |
574 | return regulator_print_opmode(buf, |
575 | rdev->constraints->state_mem.mode); | |
414c70cb | 576 | } |
7ad68e2f DB |
577 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
578 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
579 | |
580 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
581 | struct device_attribute *attr, char *buf) | |
582 | { | |
a5766f11 | 583 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 584 | |
4fca9545 DB |
585 | return regulator_print_opmode(buf, |
586 | rdev->constraints->state_disk.mode); | |
414c70cb | 587 | } |
7ad68e2f DB |
588 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
589 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
590 | |
591 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
a5766f11 | 594 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 595 | |
4fca9545 DB |
596 | return regulator_print_opmode(buf, |
597 | rdev->constraints->state_standby.mode); | |
414c70cb | 598 | } |
7ad68e2f DB |
599 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
600 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
601 | |
602 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
603 | struct device_attribute *attr, char *buf) | |
604 | { | |
a5766f11 | 605 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 606 | |
4fca9545 DB |
607 | return regulator_print_state(buf, |
608 | rdev->constraints->state_mem.enabled); | |
414c70cb | 609 | } |
7ad68e2f DB |
610 | static DEVICE_ATTR(suspend_mem_state, 0444, |
611 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
612 | |
613 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
614 | struct device_attribute *attr, char *buf) | |
615 | { | |
a5766f11 | 616 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 617 | |
4fca9545 DB |
618 | return regulator_print_state(buf, |
619 | rdev->constraints->state_disk.enabled); | |
414c70cb | 620 | } |
7ad68e2f DB |
621 | static DEVICE_ATTR(suspend_disk_state, 0444, |
622 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
623 | |
624 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
625 | struct device_attribute *attr, char *buf) | |
626 | { | |
a5766f11 | 627 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 628 | |
4fca9545 DB |
629 | return regulator_print_state(buf, |
630 | rdev->constraints->state_standby.enabled); | |
414c70cb | 631 | } |
7ad68e2f DB |
632 | static DEVICE_ATTR(suspend_standby_state, 0444, |
633 | regulator_suspend_standby_state_show, NULL); | |
634 | ||
f59c8f9f MB |
635 | static ssize_t regulator_bypass_show(struct device *dev, |
636 | struct device_attribute *attr, char *buf) | |
637 | { | |
638 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
639 | const char *report; | |
640 | bool bypass; | |
641 | int ret; | |
642 | ||
643 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
644 | ||
645 | if (ret != 0) | |
646 | report = "unknown"; | |
647 | else if (bypass) | |
648 | report = "enabled"; | |
649 | else | |
650 | report = "disabled"; | |
651 | ||
652 | return sprintf(buf, "%s\n", report); | |
653 | } | |
654 | static DEVICE_ATTR(bypass, 0444, | |
655 | regulator_bypass_show, NULL); | |
bc558a60 | 656 | |
414c70cb LG |
657 | /* Calculate the new optimum regulator operating mode based on the new total |
658 | * consumer load. All locks held by caller */ | |
8460ef38 | 659 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
660 | { |
661 | struct regulator *sibling; | |
662 | int current_uA = 0, output_uV, input_uV, err; | |
663 | unsigned int mode; | |
664 | ||
70cfef26 KK |
665 | lockdep_assert_held_once(&rdev->mutex); |
666 | ||
8460ef38 BA |
667 | /* |
668 | * first check to see if we can set modes at all, otherwise just | |
669 | * tell the consumer everything is OK. | |
670 | */ | |
8a34e979 | 671 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
8460ef38 BA |
672 | return 0; |
673 | ||
8f4490e0 BA |
674 | if (!rdev->desc->ops->get_optimum_mode && |
675 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
676 | return 0; |
677 | ||
8f4490e0 BA |
678 | if (!rdev->desc->ops->set_mode && |
679 | !rdev->desc->ops->set_load) | |
8460ef38 | 680 | return -EINVAL; |
414c70cb LG |
681 | |
682 | /* get output voltage */ | |
1bf5a1f8 | 683 | output_uV = _regulator_get_voltage(rdev); |
8460ef38 BA |
684 | if (output_uV <= 0) { |
685 | rdev_err(rdev, "invalid output voltage found\n"); | |
686 | return -EINVAL; | |
687 | } | |
414c70cb LG |
688 | |
689 | /* get input voltage */ | |
1bf5a1f8 MB |
690 | input_uV = 0; |
691 | if (rdev->supply) | |
3f24f5ad | 692 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 693 | if (input_uV <= 0) |
414c70cb | 694 | input_uV = rdev->constraints->input_uV; |
8460ef38 BA |
695 | if (input_uV <= 0) { |
696 | rdev_err(rdev, "invalid input voltage found\n"); | |
697 | return -EINVAL; | |
698 | } | |
414c70cb LG |
699 | |
700 | /* calc total requested load */ | |
701 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 702 | current_uA += sibling->uA_load; |
414c70cb | 703 | |
22a10bca SB |
704 | current_uA += rdev->constraints->system_load; |
705 | ||
8f4490e0 BA |
706 | if (rdev->desc->ops->set_load) { |
707 | /* set the optimum mode for our new total regulator load */ | |
708 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
709 | if (err < 0) | |
710 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
711 | } else { | |
712 | /* now get the optimum mode for our new total regulator load */ | |
713 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
714 | output_uV, current_uA); | |
715 | ||
716 | /* check the new mode is allowed */ | |
717 | err = regulator_mode_constrain(rdev, &mode); | |
718 | if (err < 0) { | |
719 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
720 | current_uA, input_uV, output_uV); | |
721 | return err; | |
722 | } | |
414c70cb | 723 | |
8f4490e0 BA |
724 | err = rdev->desc->ops->set_mode(rdev, mode); |
725 | if (err < 0) | |
726 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
727 | } |
728 | ||
8460ef38 | 729 | return err; |
414c70cb LG |
730 | } |
731 | ||
732 | static int suspend_set_state(struct regulator_dev *rdev, | |
733 | struct regulator_state *rstate) | |
734 | { | |
735 | int ret = 0; | |
638f85c5 MB |
736 | |
737 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
738 | * only warn if the driver implements set_suspend_voltage or |
739 | * set_suspend_mode callback. | |
638f85c5 MB |
740 | */ |
741 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
742 | if (rdev->desc->ops->set_suspend_voltage || |
743 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 744 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
745 | return 0; |
746 | } | |
747 | ||
748 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 749 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
750 | return -EINVAL; |
751 | } | |
414c70cb | 752 | |
8ac0e95d | 753 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 754 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 755 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 756 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
757 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
758 | ret = 0; | |
759 | ||
414c70cb | 760 | if (ret < 0) { |
5da84fd9 | 761 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
762 | return ret; |
763 | } | |
764 | ||
765 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
766 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
767 | if (ret < 0) { | |
5da84fd9 | 768 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
769 | return ret; |
770 | } | |
771 | } | |
772 | ||
773 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
774 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
775 | if (ret < 0) { | |
5da84fd9 | 776 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
777 | return ret; |
778 | } | |
779 | } | |
780 | return ret; | |
781 | } | |
782 | ||
783 | /* locks held by caller */ | |
784 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
785 | { | |
786 | if (!rdev->constraints) | |
787 | return -EINVAL; | |
788 | ||
789 | switch (state) { | |
790 | case PM_SUSPEND_STANDBY: | |
791 | return suspend_set_state(rdev, | |
792 | &rdev->constraints->state_standby); | |
793 | case PM_SUSPEND_MEM: | |
794 | return suspend_set_state(rdev, | |
795 | &rdev->constraints->state_mem); | |
796 | case PM_SUSPEND_MAX: | |
797 | return suspend_set_state(rdev, | |
798 | &rdev->constraints->state_disk); | |
799 | default: | |
800 | return -EINVAL; | |
801 | } | |
802 | } | |
803 | ||
804 | static void print_constraints(struct regulator_dev *rdev) | |
805 | { | |
806 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 807 | char buf[160] = ""; |
5751a99f | 808 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
809 | int count = 0; |
810 | int ret; | |
414c70cb | 811 | |
8f031b48 | 812 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 813 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
814 | count += scnprintf(buf + count, len - count, "%d mV ", |
815 | constraints->min_uV / 1000); | |
414c70cb | 816 | else |
5751a99f SW |
817 | count += scnprintf(buf + count, len - count, |
818 | "%d <--> %d mV ", | |
819 | constraints->min_uV / 1000, | |
820 | constraints->max_uV / 1000); | |
8f031b48 MB |
821 | } |
822 | ||
823 | if (!constraints->min_uV || | |
824 | constraints->min_uV != constraints->max_uV) { | |
825 | ret = _regulator_get_voltage(rdev); | |
826 | if (ret > 0) | |
5751a99f SW |
827 | count += scnprintf(buf + count, len - count, |
828 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
829 | } |
830 | ||
bf5892a8 | 831 | if (constraints->uV_offset) |
5751a99f SW |
832 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
833 | constraints->uV_offset / 1000); | |
bf5892a8 | 834 | |
8f031b48 | 835 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 836 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
837 | count += scnprintf(buf + count, len - count, "%d mA ", |
838 | constraints->min_uA / 1000); | |
414c70cb | 839 | else |
5751a99f SW |
840 | count += scnprintf(buf + count, len - count, |
841 | "%d <--> %d mA ", | |
842 | constraints->min_uA / 1000, | |
843 | constraints->max_uA / 1000); | |
8f031b48 MB |
844 | } |
845 | ||
846 | if (!constraints->min_uA || | |
847 | constraints->min_uA != constraints->max_uA) { | |
848 | ret = _regulator_get_current_limit(rdev); | |
849 | if (ret > 0) | |
5751a99f SW |
850 | count += scnprintf(buf + count, len - count, |
851 | "at %d mA ", ret / 1000); | |
414c70cb | 852 | } |
8f031b48 | 853 | |
414c70cb | 854 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 855 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 856 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 857 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 858 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 859 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 860 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 861 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 862 | |
215b8b05 | 863 | if (!count) |
5751a99f | 864 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 865 | |
194dbaef | 866 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
867 | |
868 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 869 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
870 | rdev_warn(rdev, |
871 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
872 | } |
873 | ||
e79055d6 | 874 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 875 | struct regulation_constraints *constraints) |
a5766f11 | 876 | { |
272e2315 | 877 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
878 | int ret; |
879 | ||
880 | /* do we need to apply the constraint voltage */ | |
881 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
882 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
883 | int target_min, target_max; | |
064d5cd1 AB |
884 | int current_uV = _regulator_get_voltage(rdev); |
885 | if (current_uV < 0) { | |
69d58839 NM |
886 | rdev_err(rdev, |
887 | "failed to get the current voltage(%d)\n", | |
888 | current_uV); | |
064d5cd1 AB |
889 | return current_uV; |
890 | } | |
fa93fd4e MB |
891 | |
892 | /* | |
893 | * If we're below the minimum voltage move up to the | |
894 | * minimum voltage, if we're above the maximum voltage | |
895 | * then move down to the maximum. | |
896 | */ | |
897 | target_min = current_uV; | |
898 | target_max = current_uV; | |
899 | ||
900 | if (current_uV < rdev->constraints->min_uV) { | |
901 | target_min = rdev->constraints->min_uV; | |
902 | target_max = rdev->constraints->min_uV; | |
903 | } | |
904 | ||
905 | if (current_uV > rdev->constraints->max_uV) { | |
906 | target_min = rdev->constraints->max_uV; | |
907 | target_max = rdev->constraints->max_uV; | |
908 | } | |
909 | ||
910 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
911 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
912 | current_uV, target_min, target_max); | |
064d5cd1 | 913 | ret = _regulator_do_set_voltage( |
fa93fd4e | 914 | rdev, target_min, target_max); |
064d5cd1 AB |
915 | if (ret < 0) { |
916 | rdev_err(rdev, | |
fa93fd4e MB |
917 | "failed to apply %d-%duV constraint(%d)\n", |
918 | target_min, target_max, ret); | |
064d5cd1 AB |
919 | return ret; |
920 | } | |
75790251 | 921 | } |
af5866c9 | 922 | } |
e06f5b4f | 923 | |
4367cfdc DB |
924 | /* constrain machine-level voltage specs to fit |
925 | * the actual range supported by this regulator. | |
926 | */ | |
927 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
928 | int count = rdev->desc->n_voltages; | |
929 | int i; | |
930 | int min_uV = INT_MAX; | |
931 | int max_uV = INT_MIN; | |
932 | int cmin = constraints->min_uV; | |
933 | int cmax = constraints->max_uV; | |
934 | ||
3e590918 MB |
935 | /* it's safe to autoconfigure fixed-voltage supplies |
936 | and the constraints are used by list_voltage. */ | |
4367cfdc | 937 | if (count == 1 && !cmin) { |
3e590918 | 938 | cmin = 1; |
4367cfdc | 939 | cmax = INT_MAX; |
3e590918 MB |
940 | constraints->min_uV = cmin; |
941 | constraints->max_uV = cmax; | |
4367cfdc DB |
942 | } |
943 | ||
3e2b9abd MB |
944 | /* voltage constraints are optional */ |
945 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 946 | return 0; |
3e2b9abd | 947 | |
4367cfdc | 948 | /* else require explicit machine-level constraints */ |
3e2b9abd | 949 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 950 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 951 | return -EINVAL; |
4367cfdc DB |
952 | } |
953 | ||
954 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
955 | for (i = 0; i < count; i++) { | |
956 | int value; | |
957 | ||
958 | value = ops->list_voltage(rdev, i); | |
959 | if (value <= 0) | |
960 | continue; | |
961 | ||
962 | /* maybe adjust [min_uV..max_uV] */ | |
963 | if (value >= cmin && value < min_uV) | |
964 | min_uV = value; | |
965 | if (value <= cmax && value > max_uV) | |
966 | max_uV = value; | |
967 | } | |
968 | ||
969 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
970 | if (max_uV < min_uV) { | |
fff15bef MB |
971 | rdev_err(rdev, |
972 | "unsupportable voltage constraints %u-%uuV\n", | |
973 | min_uV, max_uV); | |
e79055d6 | 974 | return -EINVAL; |
4367cfdc DB |
975 | } |
976 | ||
977 | /* use regulator's subset of machine constraints */ | |
978 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
979 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
980 | constraints->min_uV, min_uV); | |
4367cfdc DB |
981 | constraints->min_uV = min_uV; |
982 | } | |
983 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
984 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
985 | constraints->max_uV, max_uV); | |
4367cfdc DB |
986 | constraints->max_uV = max_uV; |
987 | } | |
988 | } | |
989 | ||
e79055d6 MB |
990 | return 0; |
991 | } | |
992 | ||
f8c1700d LD |
993 | static int machine_constraints_current(struct regulator_dev *rdev, |
994 | struct regulation_constraints *constraints) | |
995 | { | |
272e2315 | 996 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
997 | int ret; |
998 | ||
999 | if (!constraints->min_uA && !constraints->max_uA) | |
1000 | return 0; | |
1001 | ||
1002 | if (constraints->min_uA > constraints->max_uA) { | |
1003 | rdev_err(rdev, "Invalid current constraints\n"); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | ||
1007 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1008 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | /* Set regulator current in constraints range */ | |
1013 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1014 | constraints->max_uA); | |
1015 | if (ret < 0) { | |
1016 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1017 | return ret; | |
1018 | } | |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
30c21971 MP |
1023 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1024 | ||
e79055d6 MB |
1025 | /** |
1026 | * set_machine_constraints - sets regulator constraints | |
1027 | * @rdev: regulator source | |
1028 | * @constraints: constraints to apply | |
1029 | * | |
1030 | * Allows platform initialisation code to define and constrain | |
1031 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1032 | * Constraints *must* be set by platform code in order for some | |
1033 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1034 | * set_mode. | |
1035 | */ | |
1036 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1037 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1038 | { |
1039 | int ret = 0; | |
272e2315 | 1040 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1041 | |
9a8f5e07 MB |
1042 | if (constraints) |
1043 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1044 | GFP_KERNEL); | |
1045 | else | |
1046 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1047 | GFP_KERNEL); | |
f8c12fe3 MB |
1048 | if (!rdev->constraints) |
1049 | return -ENOMEM; | |
af5866c9 | 1050 | |
f8c12fe3 | 1051 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1052 | if (ret != 0) |
6333ef46 | 1053 | return ret; |
e79055d6 | 1054 | |
f8c1700d | 1055 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1056 | if (ret != 0) |
6333ef46 | 1057 | return ret; |
e79055d6 | 1058 | |
36e4f839 SB |
1059 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1060 | ret = ops->set_input_current_limit(rdev, | |
1061 | rdev->constraints->ilim_uA); | |
1062 | if (ret < 0) { | |
1063 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1064 | return ret; |
36e4f839 SB |
1065 | } |
1066 | } | |
1067 | ||
a5766f11 | 1068 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1069 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1070 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1071 | if (ret < 0) { |
5da84fd9 | 1072 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1073 | return ret; |
e06f5b4f MB |
1074 | } |
1075 | } | |
a5766f11 | 1076 | |
9a8f5e07 | 1077 | if (rdev->constraints->initial_mode) { |
a308466c | 1078 | if (!ops->set_mode) { |
5da84fd9 | 1079 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1080 | return -EINVAL; |
a308466c MB |
1081 | } |
1082 | ||
f8c12fe3 | 1083 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1084 | if (ret < 0) { |
5da84fd9 | 1085 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1086 | return ret; |
a308466c MB |
1087 | } |
1088 | } | |
1089 | ||
cacf90f2 MB |
1090 | /* If the constraints say the regulator should be on at this point |
1091 | * and we have control then make sure it is enabled. | |
1092 | */ | |
30c21971 MP |
1093 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1094 | ret = _regulator_do_enable(rdev); | |
1095 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1096 | rdev_err(rdev, "failed to enable\n"); |
6333ef46 | 1097 | return ret; |
e5fda26c MB |
1098 | } |
1099 | } | |
1100 | ||
1653ccf4 YSB |
1101 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1102 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1103 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1104 | if (ret < 0) { | |
1105 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1106 | return ret; |
6f0b2c69 YSB |
1107 | } |
1108 | } | |
1109 | ||
23c779b9 SB |
1110 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1111 | ret = ops->set_pull_down(rdev); | |
1112 | if (ret < 0) { | |
1113 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1114 | return ret; |
23c779b9 SB |
1115 | } |
1116 | } | |
1117 | ||
57f66b78 SB |
1118 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1119 | ret = ops->set_soft_start(rdev); | |
1120 | if (ret < 0) { | |
1121 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1122 | return ret; |
57f66b78 SB |
1123 | } |
1124 | } | |
1125 | ||
3a003bae SB |
1126 | if (rdev->constraints->over_current_protection |
1127 | && ops->set_over_current_protection) { | |
1128 | ret = ops->set_over_current_protection(rdev); | |
1129 | if (ret < 0) { | |
1130 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1131 | return ret; |
3a003bae SB |
1132 | } |
1133 | } | |
1134 | ||
670666b9 LD |
1135 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1136 | bool ad_state = (rdev->constraints->active_discharge == | |
1137 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1138 | ||
1139 | ret = ops->set_active_discharge(rdev, ad_state); | |
1140 | if (ret < 0) { | |
1141 | rdev_err(rdev, "failed to set active discharge\n"); | |
1142 | return ret; | |
1143 | } | |
1144 | } | |
1145 | ||
a5766f11 | 1146 | print_constraints(rdev); |
1a6958e7 | 1147 | return 0; |
a5766f11 LG |
1148 | } |
1149 | ||
1150 | /** | |
1151 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1152 | * @rdev: regulator name |
1153 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1154 | * |
1155 | * Called by platform initialisation code to set the supply regulator for this | |
1156 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1157 | * core if it's child is enabled. | |
1158 | */ | |
1159 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1160 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1161 | { |
1162 | int err; | |
1163 | ||
3801b86a MB |
1164 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1165 | ||
e2c09ae7 JMC |
1166 | if (!try_module_get(supply_rdev->owner)) |
1167 | return -ENODEV; | |
1168 | ||
3801b86a | 1169 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1170 | if (rdev->supply == NULL) { |
1171 | err = -ENOMEM; | |
3801b86a | 1172 | return err; |
a5766f11 | 1173 | } |
57ad526a | 1174 | supply_rdev->open_count++; |
3801b86a MB |
1175 | |
1176 | return 0; | |
a5766f11 LG |
1177 | } |
1178 | ||
1179 | /** | |
06c63f93 | 1180 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1181 | * @rdev: regulator source |
40f9244f | 1182 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1183 | * @supply: symbolic name for supply |
a5766f11 LG |
1184 | * |
1185 | * Allows platform initialisation code to map physical regulator | |
1186 | * sources to symbolic names for supplies for use by devices. Devices | |
1187 | * should use these symbolic names to request regulators, avoiding the | |
1188 | * need to provide board-specific regulator names as platform data. | |
1189 | */ | |
1190 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1191 | const char *consumer_dev_name, |
1192 | const char *supply) | |
a5766f11 LG |
1193 | { |
1194 | struct regulator_map *node; | |
9ed2099e | 1195 | int has_dev; |
a5766f11 LG |
1196 | |
1197 | if (supply == NULL) | |
1198 | return -EINVAL; | |
1199 | ||
9ed2099e MB |
1200 | if (consumer_dev_name != NULL) |
1201 | has_dev = 1; | |
1202 | else | |
1203 | has_dev = 0; | |
1204 | ||
6001e13c | 1205 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1206 | if (node->dev_name && consumer_dev_name) { |
1207 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1208 | continue; | |
1209 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1210 | continue; |
23b5cc2a JN |
1211 | } |
1212 | ||
6001e13c DB |
1213 | if (strcmp(node->supply, supply) != 0) |
1214 | continue; | |
1215 | ||
737f360d MB |
1216 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1217 | consumer_dev_name, | |
1218 | dev_name(&node->regulator->dev), | |
1219 | node->regulator->desc->name, | |
1220 | supply, | |
1221 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1222 | return -EBUSY; |
1223 | } | |
1224 | ||
9ed2099e | 1225 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1226 | if (node == NULL) |
1227 | return -ENOMEM; | |
1228 | ||
1229 | node->regulator = rdev; | |
a5766f11 LG |
1230 | node->supply = supply; |
1231 | ||
9ed2099e MB |
1232 | if (has_dev) { |
1233 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1234 | if (node->dev_name == NULL) { | |
1235 | kfree(node); | |
1236 | return -ENOMEM; | |
1237 | } | |
40f9244f MB |
1238 | } |
1239 | ||
a5766f11 LG |
1240 | list_add(&node->list, ®ulator_map_list); |
1241 | return 0; | |
1242 | } | |
1243 | ||
0f1d747b MR |
1244 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1245 | { | |
1246 | struct regulator_map *node, *n; | |
1247 | ||
1248 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1249 | if (rdev == node->regulator) { | |
1250 | list_del(&node->list); | |
40f9244f | 1251 | kfree(node->dev_name); |
0f1d747b | 1252 | kfree(node); |
0f1d747b MR |
1253 | } |
1254 | } | |
1255 | } | |
1256 | ||
2d80a91b RF |
1257 | #ifdef CONFIG_DEBUG_FS |
1258 | static ssize_t constraint_flags_read_file(struct file *file, | |
1259 | char __user *user_buf, | |
1260 | size_t count, loff_t *ppos) | |
1261 | { | |
1262 | const struct regulator *regulator = file->private_data; | |
1263 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1264 | char *buf; | |
1265 | ssize_t ret; | |
1266 | ||
1267 | if (!c) | |
1268 | return 0; | |
1269 | ||
1270 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1271 | if (!buf) | |
1272 | return -ENOMEM; | |
1273 | ||
1274 | ret = snprintf(buf, PAGE_SIZE, | |
1275 | "always_on: %u\n" | |
1276 | "boot_on: %u\n" | |
1277 | "apply_uV: %u\n" | |
1278 | "ramp_disable: %u\n" | |
1279 | "soft_start: %u\n" | |
1280 | "pull_down: %u\n" | |
1281 | "over_current_protection: %u\n", | |
1282 | c->always_on, | |
1283 | c->boot_on, | |
1284 | c->apply_uV, | |
1285 | c->ramp_disable, | |
1286 | c->soft_start, | |
1287 | c->pull_down, | |
1288 | c->over_current_protection); | |
1289 | ||
1290 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1291 | kfree(buf); | |
1292 | ||
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | #endif | |
1297 | ||
1298 | static const struct file_operations constraint_flags_fops = { | |
1299 | #ifdef CONFIG_DEBUG_FS | |
1300 | .open = simple_open, | |
1301 | .read = constraint_flags_read_file, | |
1302 | .llseek = default_llseek, | |
1303 | #endif | |
1304 | }; | |
1305 | ||
f5726ae3 | 1306 | #define REG_STR_SIZE 64 |
414c70cb LG |
1307 | |
1308 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1309 | struct device *dev, | |
1310 | const char *supply_name) | |
1311 | { | |
1312 | struct regulator *regulator; | |
1313 | char buf[REG_STR_SIZE]; | |
1314 | int err, size; | |
1315 | ||
1316 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1317 | if (regulator == NULL) | |
1318 | return NULL; | |
1319 | ||
1320 | mutex_lock(&rdev->mutex); | |
1321 | regulator->rdev = rdev; | |
1322 | list_add(®ulator->list, &rdev->consumer_list); | |
1323 | ||
1324 | if (dev) { | |
e2c98eaf SG |
1325 | regulator->dev = dev; |
1326 | ||
222cc7b1 | 1327 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1328 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1329 | dev->kobj.name, supply_name); | |
1330 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1331 | goto overflow_err; |
414c70cb LG |
1332 | |
1333 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1334 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1335 | goto overflow_err; |
414c70cb | 1336 | |
ff268b56 | 1337 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1338 | buf); |
1339 | if (err) { | |
ff268b56 | 1340 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1341 | dev->kobj.name, err); |
222cc7b1 | 1342 | /* non-fatal */ |
414c70cb | 1343 | } |
5de70519 MB |
1344 | } else { |
1345 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1346 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1347 | goto overflow_err; |
5de70519 MB |
1348 | } |
1349 | ||
5de70519 MB |
1350 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1351 | rdev->debugfs); | |
24751434 | 1352 | if (!regulator->debugfs) { |
ad3a942b | 1353 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1354 | } else { |
1355 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1356 | ®ulator->uA_load); | |
1357 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1358 | ®ulator->min_uV); | |
1359 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1360 | ®ulator->max_uV); | |
2d80a91b RF |
1361 | debugfs_create_file("constraint_flags", 0444, |
1362 | regulator->debugfs, regulator, | |
1363 | &constraint_flags_fops); | |
414c70cb | 1364 | } |
5de70519 | 1365 | |
6492bc1b MB |
1366 | /* |
1367 | * Check now if the regulator is an always on regulator - if | |
1368 | * it is then we don't need to do nearly so much work for | |
1369 | * enable/disable calls. | |
1370 | */ | |
8a34e979 | 1371 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1372 | _regulator_is_enabled(rdev)) |
1373 | regulator->always_on = true; | |
1374 | ||
414c70cb LG |
1375 | mutex_unlock(&rdev->mutex); |
1376 | return regulator; | |
414c70cb LG |
1377 | overflow_err: |
1378 | list_del(®ulator->list); | |
1379 | kfree(regulator); | |
1380 | mutex_unlock(&rdev->mutex); | |
1381 | return NULL; | |
1382 | } | |
1383 | ||
31aae2be MB |
1384 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1385 | { | |
00c877c6 LD |
1386 | if (rdev->constraints && rdev->constraints->enable_time) |
1387 | return rdev->constraints->enable_time; | |
31aae2be | 1388 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1389 | return rdev->desc->enable_time; |
31aae2be MB |
1390 | return rdev->desc->ops->enable_time(rdev); |
1391 | } | |
1392 | ||
a06ccd9c CK |
1393 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1394 | struct device *dev, const char *supply) | |
1395 | { | |
1396 | struct regulator_supply_alias *map; | |
1397 | ||
1398 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1399 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1400 | return map; | |
1401 | ||
1402 | return NULL; | |
1403 | } | |
1404 | ||
1405 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1406 | { | |
1407 | struct regulator_supply_alias *map; | |
1408 | ||
1409 | map = regulator_find_supply_alias(*dev, *supply); | |
1410 | if (map) { | |
1411 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1412 | *supply, map->alias_supply, | |
1413 | dev_name(map->alias_dev)); | |
1414 | *dev = map->alias_dev; | |
1415 | *supply = map->alias_supply; | |
1416 | } | |
1417 | } | |
1418 | ||
85f3b431 TV |
1419 | static int of_node_match(struct device *dev, const void *data) |
1420 | { | |
1421 | return dev->of_node == data; | |
1422 | } | |
1423 | ||
1424 | static struct regulator_dev *of_find_regulator_by_node(struct device_node *np) | |
1425 | { | |
1426 | struct device *dev; | |
1427 | ||
1428 | dev = class_find_device(®ulator_class, NULL, np, of_node_match); | |
1429 | ||
1430 | return dev ? dev_to_rdev(dev) : NULL; | |
1431 | } | |
1432 | ||
1433 | static int regulator_match(struct device *dev, const void *data) | |
1434 | { | |
1435 | struct regulator_dev *r = dev_to_rdev(dev); | |
1436 | ||
1437 | return strcmp(rdev_get_name(r), data) == 0; | |
1438 | } | |
1439 | ||
1440 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1441 | { | |
1442 | struct device *dev; | |
1443 | ||
1444 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1445 | ||
1446 | return dev ? dev_to_rdev(dev) : NULL; | |
1447 | } | |
1448 | ||
1449 | /** | |
1450 | * regulator_dev_lookup - lookup a regulator device. | |
1451 | * @dev: device for regulator "consumer". | |
1452 | * @supply: Supply name or regulator ID. | |
1453 | * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if | |
1454 | * lookup could succeed in the future. | |
1455 | * | |
1456 | * If successful, returns a struct regulator_dev that corresponds to the name | |
1457 | * @supply and with the embedded struct device refcount incremented by one, | |
1458 | * or NULL on failure. The refcount must be dropped by calling put_device(). | |
1459 | */ | |
69511a45 | 1460 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1461 | const char *supply, |
1462 | int *ret) | |
69511a45 RN |
1463 | { |
1464 | struct regulator_dev *r; | |
1465 | struct device_node *node; | |
576ca436 MB |
1466 | struct regulator_map *map; |
1467 | const char *devname = NULL; | |
69511a45 | 1468 | |
a06ccd9c CK |
1469 | regulator_supply_alias(&dev, &supply); |
1470 | ||
69511a45 RN |
1471 | /* first do a dt based lookup */ |
1472 | if (dev && dev->of_node) { | |
1473 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1474 | if (node) { |
85f3b431 TV |
1475 | r = of_find_regulator_by_node(node); |
1476 | if (r) | |
1477 | return r; | |
317b5684 MB |
1478 | *ret = -EPROBE_DEFER; |
1479 | return NULL; | |
6d191a5f MB |
1480 | } else { |
1481 | /* | |
1482 | * If we couldn't even get the node then it's | |
1483 | * not just that the device didn't register | |
1484 | * yet, there's no node and we'll never | |
1485 | * succeed. | |
1486 | */ | |
1487 | *ret = -ENODEV; | |
1488 | } | |
69511a45 RN |
1489 | } |
1490 | ||
1491 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1492 | if (dev) |
1493 | devname = dev_name(dev); | |
1494 | ||
85f3b431 TV |
1495 | r = regulator_lookup_by_name(supply); |
1496 | if (r) | |
1497 | return r; | |
69511a45 | 1498 | |
85f3b431 | 1499 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1500 | list_for_each_entry(map, ®ulator_map_list, list) { |
1501 | /* If the mapping has a device set up it must match */ | |
1502 | if (map->dev_name && | |
1503 | (!devname || strcmp(map->dev_name, devname))) | |
1504 | continue; | |
1505 | ||
85f3b431 TV |
1506 | if (strcmp(map->supply, supply) == 0 && |
1507 | get_device(&map->regulator->dev)) { | |
1508 | mutex_unlock(®ulator_list_mutex); | |
576ca436 | 1509 | return map->regulator; |
85f3b431 | 1510 | } |
576ca436 | 1511 | } |
85f3b431 | 1512 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1513 | |
69511a45 RN |
1514 | return NULL; |
1515 | } | |
1516 | ||
6261b06d BA |
1517 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1518 | { | |
1519 | struct regulator_dev *r; | |
1520 | struct device *dev = rdev->dev.parent; | |
1521 | int ret; | |
1522 | ||
1523 | /* No supply to resovle? */ | |
1524 | if (!rdev->supply_name) | |
1525 | return 0; | |
1526 | ||
1527 | /* Supply already resolved? */ | |
1528 | if (rdev->supply) | |
1529 | return 0; | |
1530 | ||
1531 | r = regulator_dev_lookup(dev, rdev->supply_name, &ret); | |
6261b06d | 1532 | if (!r) { |
23c3f310 CK |
1533 | if (ret == -ENODEV) { |
1534 | /* | |
1535 | * No supply was specified for this regulator and | |
1536 | * there will never be one. | |
1537 | */ | |
1538 | return 0; | |
1539 | } | |
1540 | ||
06423121 MB |
1541 | /* Did the lookup explicitly defer for us? */ |
1542 | if (ret == -EPROBE_DEFER) | |
1543 | return ret; | |
1544 | ||
9f7e25ed MB |
1545 | if (have_full_constraints()) { |
1546 | r = dummy_regulator_rdev; | |
85f3b431 | 1547 | get_device(&r->dev); |
9f7e25ed MB |
1548 | } else { |
1549 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1550 | rdev->supply_name, rdev->desc->name); | |
1551 | return -EPROBE_DEFER; | |
1552 | } | |
6261b06d BA |
1553 | } |
1554 | ||
1555 | /* Recursively resolve the supply of the supply */ | |
1556 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1557 | if (ret < 0) { |
1558 | put_device(&r->dev); | |
6261b06d | 1559 | return ret; |
85f3b431 | 1560 | } |
6261b06d BA |
1561 | |
1562 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1563 | if (ret < 0) { |
1564 | put_device(&r->dev); | |
6261b06d | 1565 | return ret; |
85f3b431 | 1566 | } |
6261b06d BA |
1567 | |
1568 | /* Cascade always-on state to supply */ | |
95a293c7 | 1569 | if (_regulator_is_enabled(rdev)) { |
6261b06d | 1570 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1571 | if (ret < 0) { |
9f8df6ad | 1572 | _regulator_put(rdev->supply); |
8e5356a7 | 1573 | rdev->supply = NULL; |
6261b06d | 1574 | return ret; |
36a1f1b6 | 1575 | } |
6261b06d BA |
1576 | } |
1577 | ||
1578 | return 0; | |
1579 | } | |
1580 | ||
5ffbd136 MB |
1581 | /* Internal regulator request function */ |
1582 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1583 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1584 | { |
1585 | struct regulator_dev *rdev; | |
04bf3011 | 1586 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1587 | const char *devname = NULL; |
317b5684 | 1588 | int ret; |
414c70cb LG |
1589 | |
1590 | if (id == NULL) { | |
5da84fd9 | 1591 | pr_err("get() with no identifier\n"); |
043c998f | 1592 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1593 | } |
1594 | ||
40f9244f MB |
1595 | if (dev) |
1596 | devname = dev_name(dev); | |
1597 | ||
317b5684 MB |
1598 | if (have_full_constraints()) |
1599 | ret = -ENODEV; | |
1600 | else | |
1601 | ret = -EPROBE_DEFER; | |
1602 | ||
6d191a5f | 1603 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1604 | if (rdev) |
1605 | goto found; | |
1606 | ||
ef60abbb MB |
1607 | regulator = ERR_PTR(ret); |
1608 | ||
1e4b545c NM |
1609 | /* |
1610 | * If we have return value from dev_lookup fail, we do not expect to | |
1611 | * succeed, so, quit with appropriate error value | |
1612 | */ | |
0d25d09d | 1613 | if (ret && ret != -ENODEV) |
85f3b431 | 1614 | return regulator; |
1e4b545c | 1615 | |
34abbd68 MB |
1616 | if (!devname) |
1617 | devname = "deviceless"; | |
1618 | ||
4ddfebd3 MB |
1619 | /* |
1620 | * Assume that a regulator is physically present and enabled | |
1621 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1622 | */ |
87b28417 | 1623 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1624 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1625 | devname, id); | |
4ddfebd3 | 1626 | |
34abbd68 | 1627 | rdev = dummy_regulator_rdev; |
85f3b431 | 1628 | get_device(&rdev->dev); |
34abbd68 | 1629 | goto found; |
0781719b HG |
1630 | /* Don't log an error when called from regulator_get_optional() */ |
1631 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1632 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1633 | } |
34abbd68 | 1634 | |
414c70cb LG |
1635 | return regulator; |
1636 | ||
1637 | found: | |
5ffbd136 MB |
1638 | if (rdev->exclusive) { |
1639 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1640 | put_device(&rdev->dev); |
1641 | return regulator; | |
5ffbd136 MB |
1642 | } |
1643 | ||
1644 | if (exclusive && rdev->open_count) { | |
1645 | regulator = ERR_PTR(-EBUSY); | |
85f3b431 TV |
1646 | put_device(&rdev->dev); |
1647 | return regulator; | |
5ffbd136 MB |
1648 | } |
1649 | ||
6261b06d BA |
1650 | ret = regulator_resolve_supply(rdev); |
1651 | if (ret < 0) { | |
1652 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1653 | put_device(&rdev->dev); |
1654 | return regulator; | |
6261b06d BA |
1655 | } |
1656 | ||
85f3b431 TV |
1657 | if (!try_module_get(rdev->owner)) { |
1658 | put_device(&rdev->dev); | |
1659 | return regulator; | |
1660 | } | |
a5766f11 | 1661 | |
414c70cb LG |
1662 | regulator = create_regulator(rdev, dev, id); |
1663 | if (regulator == NULL) { | |
1664 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1665 | put_device(&rdev->dev); |
414c70cb | 1666 | module_put(rdev->owner); |
85f3b431 | 1667 | return regulator; |
414c70cb LG |
1668 | } |
1669 | ||
5ffbd136 MB |
1670 | rdev->open_count++; |
1671 | if (exclusive) { | |
1672 | rdev->exclusive = 1; | |
1673 | ||
1674 | ret = _regulator_is_enabled(rdev); | |
1675 | if (ret > 0) | |
1676 | rdev->use_count = 1; | |
1677 | else | |
1678 | rdev->use_count = 0; | |
1679 | } | |
1680 | ||
414c70cb LG |
1681 | return regulator; |
1682 | } | |
5ffbd136 MB |
1683 | |
1684 | /** | |
1685 | * regulator_get - lookup and obtain a reference to a regulator. | |
1686 | * @dev: device for regulator "consumer" | |
1687 | * @id: Supply name or regulator ID. | |
1688 | * | |
1689 | * Returns a struct regulator corresponding to the regulator producer, | |
1690 | * or IS_ERR() condition containing errno. | |
1691 | * | |
1692 | * Use of supply names configured via regulator_set_device_supply() is | |
1693 | * strongly encouraged. It is recommended that the supply name used | |
1694 | * should match the name used for the supply and/or the relevant | |
1695 | * device pins in the datasheet. | |
1696 | */ | |
1697 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1698 | { | |
4ddfebd3 | 1699 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1700 | } |
414c70cb LG |
1701 | EXPORT_SYMBOL_GPL(regulator_get); |
1702 | ||
5ffbd136 MB |
1703 | /** |
1704 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1705 | * @dev: device for regulator "consumer" | |
1706 | * @id: Supply name or regulator ID. | |
1707 | * | |
1708 | * Returns a struct regulator corresponding to the regulator producer, | |
1709 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1710 | * unable to obtain this regulator while this reference is held and the |
1711 | * use count for the regulator will be initialised to reflect the current | |
1712 | * state of the regulator. | |
5ffbd136 MB |
1713 | * |
1714 | * This is intended for use by consumers which cannot tolerate shared | |
1715 | * use of the regulator such as those which need to force the | |
1716 | * regulator off for correct operation of the hardware they are | |
1717 | * controlling. | |
1718 | * | |
1719 | * Use of supply names configured via regulator_set_device_supply() is | |
1720 | * strongly encouraged. It is recommended that the supply name used | |
1721 | * should match the name used for the supply and/or the relevant | |
1722 | * device pins in the datasheet. | |
1723 | */ | |
1724 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1725 | { | |
4ddfebd3 | 1726 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1727 | } |
1728 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1729 | ||
de1dd9fd MB |
1730 | /** |
1731 | * regulator_get_optional - obtain optional access to a regulator. | |
1732 | * @dev: device for regulator "consumer" | |
1733 | * @id: Supply name or regulator ID. | |
1734 | * | |
1735 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1736 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1737 | * |
1738 | * This is intended for use by consumers for devices which can have | |
1739 | * some supplies unconnected in normal use, such as some MMC devices. | |
1740 | * It can allow the regulator core to provide stub supplies for other | |
1741 | * supplies requested using normal regulator_get() calls without | |
1742 | * disrupting the operation of drivers that can handle absent | |
1743 | * supplies. | |
1744 | * | |
1745 | * Use of supply names configured via regulator_set_device_supply() is | |
1746 | * strongly encouraged. It is recommended that the supply name used | |
1747 | * should match the name used for the supply and/or the relevant | |
1748 | * device pins in the datasheet. | |
1749 | */ | |
1750 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1751 | { | |
4ddfebd3 | 1752 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1753 | } |
1754 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1755 | ||
83b0302d | 1756 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1757 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1758 | { |
1759 | struct regulator_dev *rdev; | |
1760 | ||
93576842 | 1761 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
1762 | return; |
1763 | ||
70cfef26 KK |
1764 | lockdep_assert_held_once(®ulator_list_mutex); |
1765 | ||
414c70cb LG |
1766 | rdev = regulator->rdev; |
1767 | ||
5de70519 | 1768 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1769 | |
414c70cb | 1770 | /* remove any sysfs entries */ |
e2c98eaf | 1771 | if (regulator->dev) |
414c70cb | 1772 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1773 | mutex_lock(&rdev->mutex); |
414c70cb | 1774 | list_del(®ulator->list); |
414c70cb | 1775 | |
5ffbd136 MB |
1776 | rdev->open_count--; |
1777 | rdev->exclusive = 0; | |
85f3b431 | 1778 | put_device(&rdev->dev); |
83b0302d | 1779 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1780 | |
1768514e MB |
1781 | kfree(regulator->supply_name); |
1782 | kfree(regulator); | |
1783 | ||
414c70cb | 1784 | module_put(rdev->owner); |
23ff2f0f CK |
1785 | } |
1786 | ||
1787 | /** | |
1788 | * regulator_put - "free" the regulator source | |
1789 | * @regulator: regulator source | |
1790 | * | |
1791 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1792 | * regulator source are balanced by regulator_disable calls prior to calling | |
1793 | * this function. | |
1794 | */ | |
1795 | void regulator_put(struct regulator *regulator) | |
1796 | { | |
1797 | mutex_lock(®ulator_list_mutex); | |
1798 | _regulator_put(regulator); | |
414c70cb LG |
1799 | mutex_unlock(®ulator_list_mutex); |
1800 | } | |
1801 | EXPORT_SYMBOL_GPL(regulator_put); | |
1802 | ||
a06ccd9c CK |
1803 | /** |
1804 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1805 | * | |
1806 | * @dev: device that will be given as the regulator "consumer" | |
1807 | * @id: Supply name or regulator ID | |
1808 | * @alias_dev: device that should be used to lookup the supply | |
1809 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1810 | * supply | |
1811 | * | |
1812 | * All lookups for id on dev will instead be conducted for alias_id on | |
1813 | * alias_dev. | |
1814 | */ | |
1815 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1816 | struct device *alias_dev, | |
1817 | const char *alias_id) | |
1818 | { | |
1819 | struct regulator_supply_alias *map; | |
1820 | ||
1821 | map = regulator_find_supply_alias(dev, id); | |
1822 | if (map) | |
1823 | return -EEXIST; | |
1824 | ||
1825 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1826 | if (!map) | |
1827 | return -ENOMEM; | |
1828 | ||
1829 | map->src_dev = dev; | |
1830 | map->src_supply = id; | |
1831 | map->alias_dev = alias_dev; | |
1832 | map->alias_supply = alias_id; | |
1833 | ||
1834 | list_add(&map->list, ®ulator_supply_alias_list); | |
1835 | ||
1836 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1837 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1842 | ||
1843 | /** | |
1844 | * regulator_unregister_supply_alias - Remove device alias | |
1845 | * | |
1846 | * @dev: device that will be given as the regulator "consumer" | |
1847 | * @id: Supply name or regulator ID | |
1848 | * | |
1849 | * Remove a lookup alias if one exists for id on dev. | |
1850 | */ | |
1851 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1852 | { | |
1853 | struct regulator_supply_alias *map; | |
1854 | ||
1855 | map = regulator_find_supply_alias(dev, id); | |
1856 | if (map) { | |
1857 | list_del(&map->list); | |
1858 | kfree(map); | |
1859 | } | |
1860 | } | |
1861 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1862 | ||
1863 | /** | |
1864 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1865 | * | |
1866 | * @dev: device that will be given as the regulator "consumer" | |
1867 | * @id: List of supply names or regulator IDs | |
1868 | * @alias_dev: device that should be used to lookup the supply | |
1869 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1870 | * lookup the supply | |
1871 | * @num_id: Number of aliases to register | |
1872 | * | |
1873 | * @return 0 on success, an errno on failure. | |
1874 | * | |
1875 | * This helper function allows drivers to register several supply | |
1876 | * aliases in one operation. If any of the aliases cannot be | |
1877 | * registered any aliases that were registered will be removed | |
1878 | * before returning to the caller. | |
1879 | */ | |
9f8c0fe9 LJ |
1880 | int regulator_bulk_register_supply_alias(struct device *dev, |
1881 | const char *const *id, | |
a06ccd9c | 1882 | struct device *alias_dev, |
9f8c0fe9 | 1883 | const char *const *alias_id, |
a06ccd9c CK |
1884 | int num_id) |
1885 | { | |
1886 | int i; | |
1887 | int ret; | |
1888 | ||
1889 | for (i = 0; i < num_id; ++i) { | |
1890 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1891 | alias_id[i]); | |
1892 | if (ret < 0) | |
1893 | goto err; | |
1894 | } | |
1895 | ||
1896 | return 0; | |
1897 | ||
1898 | err: | |
1899 | dev_err(dev, | |
1900 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1901 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1902 | ||
1903 | while (--i >= 0) | |
1904 | regulator_unregister_supply_alias(dev, id[i]); | |
1905 | ||
1906 | return ret; | |
1907 | } | |
1908 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1909 | ||
1910 | /** | |
1911 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1912 | * | |
1913 | * @dev: device that will be given as the regulator "consumer" | |
1914 | * @id: List of supply names or regulator IDs | |
1915 | * @num_id: Number of aliases to unregister | |
1916 | * | |
1917 | * This helper function allows drivers to unregister several supply | |
1918 | * aliases in one operation. | |
1919 | */ | |
1920 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1921 | const char *const *id, |
a06ccd9c CK |
1922 | int num_id) |
1923 | { | |
1924 | int i; | |
1925 | ||
1926 | for (i = 0; i < num_id; ++i) | |
1927 | regulator_unregister_supply_alias(dev, id[i]); | |
1928 | } | |
1929 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1930 | ||
1931 | ||
f19b00da KM |
1932 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1933 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1934 | const struct regulator_config *config) | |
1935 | { | |
1936 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1937 | struct gpio_desc *gpiod; |
f19b00da KM |
1938 | int ret; |
1939 | ||
778b28b4 RK |
1940 | gpiod = gpio_to_desc(config->ena_gpio); |
1941 | ||
f19b00da | 1942 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1943 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1944 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1945 | config->ena_gpio); | |
1946 | goto update_ena_gpio_to_rdev; | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | ret = gpio_request_one(config->ena_gpio, | |
1951 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1952 | rdev_get_name(rdev)); | |
1953 | if (ret) | |
1954 | return ret; | |
1955 | ||
1956 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1957 | if (pin == NULL) { | |
1958 | gpio_free(config->ena_gpio); | |
1959 | return -ENOMEM; | |
1960 | } | |
1961 | ||
778b28b4 | 1962 | pin->gpiod = gpiod; |
f19b00da KM |
1963 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1964 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1965 | ||
1966 | update_ena_gpio_to_rdev: | |
1967 | pin->request_count++; | |
1968 | rdev->ena_pin = pin; | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1973 | { | |
1974 | struct regulator_enable_gpio *pin, *n; | |
1975 | ||
1976 | if (!rdev->ena_pin) | |
1977 | return; | |
1978 | ||
1979 | /* Free the GPIO only in case of no use */ | |
1980 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1981 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1982 | if (pin->request_count <= 1) { |
1983 | pin->request_count = 0; | |
778b28b4 | 1984 | gpiod_put(pin->gpiod); |
f19b00da KM |
1985 | list_del(&pin->list); |
1986 | kfree(pin); | |
60a2362f SWK |
1987 | rdev->ena_pin = NULL; |
1988 | return; | |
f19b00da KM |
1989 | } else { |
1990 | pin->request_count--; | |
1991 | } | |
1992 | } | |
1993 | } | |
1994 | } | |
1995 | ||
967cfb18 | 1996 | /** |
31d6eebf RD |
1997 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1998 | * @rdev: regulator_dev structure | |
1999 | * @enable: enable GPIO at initial use? | |
2000 | * | |
967cfb18 KM |
2001 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2002 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2003 | */ | |
2004 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2005 | { | |
2006 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2007 | ||
2008 | if (!pin) | |
2009 | return -EINVAL; | |
2010 | ||
2011 | if (enable) { | |
2012 | /* Enable GPIO at initial use */ | |
2013 | if (pin->enable_count == 0) | |
778b28b4 RK |
2014 | gpiod_set_value_cansleep(pin->gpiod, |
2015 | !pin->ena_gpio_invert); | |
967cfb18 KM |
2016 | |
2017 | pin->enable_count++; | |
2018 | } else { | |
2019 | if (pin->enable_count > 1) { | |
2020 | pin->enable_count--; | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | /* Disable GPIO if not used */ | |
2025 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
2026 | gpiod_set_value_cansleep(pin->gpiod, |
2027 | pin->ena_gpio_invert); | |
967cfb18 KM |
2028 | pin->enable_count = 0; |
2029 | } | |
2030 | } | |
2031 | ||
2032 | return 0; | |
2033 | } | |
2034 | ||
79fd1141 GX |
2035 | /** |
2036 | * _regulator_enable_delay - a delay helper function | |
2037 | * @delay: time to delay in microseconds | |
2038 | * | |
2039 | * Delay for the requested amount of time as per the guidelines in: | |
2040 | * | |
2041 | * Documentation/timers/timers-howto.txt | |
2042 | * | |
2043 | * The assumption here is that regulators will never be enabled in | |
2044 | * atomic context and therefore sleeping functions can be used. | |
2045 | */ | |
2046 | static void _regulator_enable_delay(unsigned int delay) | |
2047 | { | |
2048 | unsigned int ms = delay / 1000; | |
2049 | unsigned int us = delay % 1000; | |
2050 | ||
2051 | if (ms > 0) { | |
2052 | /* | |
2053 | * For small enough values, handle super-millisecond | |
2054 | * delays in the usleep_range() call below. | |
2055 | */ | |
2056 | if (ms < 20) | |
2057 | us += ms * 1000; | |
2058 | else | |
2059 | msleep(ms); | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * Give the scheduler some room to coalesce with any other | |
2064 | * wakeup sources. For delays shorter than 10 us, don't even | |
2065 | * bother setting up high-resolution timers and just busy- | |
2066 | * loop. | |
2067 | */ | |
2068 | if (us >= 10) | |
2069 | usleep_range(us, us + 100); | |
2070 | else | |
2071 | udelay(us); | |
2072 | } | |
2073 | ||
5c5659d0 MB |
2074 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2075 | { | |
2076 | int ret, delay; | |
2077 | ||
2078 | /* Query before enabling in case configuration dependent. */ | |
2079 | ret = _regulator_get_enable_time(rdev); | |
2080 | if (ret >= 0) { | |
2081 | delay = ret; | |
2082 | } else { | |
2083 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2084 | delay = 0; | |
2085 | } | |
2086 | ||
2087 | trace_regulator_enable(rdev_get_name(rdev)); | |
2088 | ||
871f5650 GX |
2089 | if (rdev->desc->off_on_delay) { |
2090 | /* if needed, keep a distance of off_on_delay from last time | |
2091 | * this regulator was disabled. | |
2092 | */ | |
2093 | unsigned long start_jiffy = jiffies; | |
2094 | unsigned long intended, max_delay, remaining; | |
2095 | ||
2096 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2097 | intended = rdev->last_off_jiffy + max_delay; | |
2098 | ||
2099 | if (time_before(start_jiffy, intended)) { | |
2100 | /* calc remaining jiffies to deal with one-time | |
2101 | * timer wrapping. | |
2102 | * in case of multiple timer wrapping, either it can be | |
2103 | * detected by out-of-range remaining, or it cannot be | |
2104 | * detected and we gets a panelty of | |
2105 | * _regulator_enable_delay(). | |
2106 | */ | |
2107 | remaining = intended - start_jiffy; | |
2108 | if (remaining <= max_delay) | |
2109 | _regulator_enable_delay( | |
2110 | jiffies_to_usecs(remaining)); | |
2111 | } | |
2112 | } | |
2113 | ||
967cfb18 | 2114 | if (rdev->ena_pin) { |
29d62ec5 DA |
2115 | if (!rdev->ena_gpio_state) { |
2116 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2117 | if (ret < 0) | |
2118 | return ret; | |
2119 | rdev->ena_gpio_state = 1; | |
2120 | } | |
65f73508 | 2121 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2122 | ret = rdev->desc->ops->enable(rdev); |
2123 | if (ret < 0) | |
2124 | return ret; | |
2125 | } else { | |
2126 | return -EINVAL; | |
2127 | } | |
2128 | ||
2129 | /* Allow the regulator to ramp; it would be useful to extend | |
2130 | * this for bulk operations so that the regulators can ramp | |
2131 | * together. */ | |
2132 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2133 | ||
79fd1141 | 2134 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2135 | |
2136 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
414c70cb LG |
2141 | /* locks held by regulator_enable() */ |
2142 | static int _regulator_enable(struct regulator_dev *rdev) | |
2143 | { | |
5c5659d0 | 2144 | int ret; |
414c70cb | 2145 | |
70cfef26 KK |
2146 | lockdep_assert_held_once(&rdev->mutex); |
2147 | ||
414c70cb | 2148 | /* check voltage and requested load before enabling */ |
8a34e979 | 2149 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
9a2372fa | 2150 | drms_uA_update(rdev); |
414c70cb | 2151 | |
9a2372fa MB |
2152 | if (rdev->use_count == 0) { |
2153 | /* The regulator may on if it's not switchable or left on */ | |
2154 | ret = _regulator_is_enabled(rdev); | |
2155 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 WP |
2156 | if (!regulator_ops_is_valid(rdev, |
2157 | REGULATOR_CHANGE_STATUS)) | |
9a2372fa MB |
2158 | return -EPERM; |
2159 | ||
5c5659d0 | 2160 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
2161 | if (ret < 0) |
2162 | return ret; | |
2163 | ||
a7433cff | 2164 | } else if (ret < 0) { |
5da84fd9 | 2165 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
2166 | return ret; |
2167 | } | |
a7433cff | 2168 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2169 | } |
2170 | ||
9a2372fa MB |
2171 | rdev->use_count++; |
2172 | ||
2173 | return 0; | |
414c70cb LG |
2174 | } |
2175 | ||
2176 | /** | |
2177 | * regulator_enable - enable regulator output | |
2178 | * @regulator: regulator source | |
2179 | * | |
cf7bbcdf MB |
2180 | * Request that the regulator be enabled with the regulator output at |
2181 | * the predefined voltage or current value. Calls to regulator_enable() | |
2182 | * must be balanced with calls to regulator_disable(). | |
2183 | * | |
414c70cb | 2184 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2185 | * hardwired in the regulator. |
414c70cb LG |
2186 | */ |
2187 | int regulator_enable(struct regulator *regulator) | |
2188 | { | |
412aec61 DB |
2189 | struct regulator_dev *rdev = regulator->rdev; |
2190 | int ret = 0; | |
414c70cb | 2191 | |
6492bc1b MB |
2192 | if (regulator->always_on) |
2193 | return 0; | |
2194 | ||
3801b86a MB |
2195 | if (rdev->supply) { |
2196 | ret = regulator_enable(rdev->supply); | |
2197 | if (ret != 0) | |
2198 | return ret; | |
2199 | } | |
2200 | ||
412aec61 | 2201 | mutex_lock(&rdev->mutex); |
cd94b505 | 2202 | ret = _regulator_enable(rdev); |
412aec61 | 2203 | mutex_unlock(&rdev->mutex); |
3801b86a | 2204 | |
d1685e4e | 2205 | if (ret != 0 && rdev->supply) |
3801b86a MB |
2206 | regulator_disable(rdev->supply); |
2207 | ||
414c70cb LG |
2208 | return ret; |
2209 | } | |
2210 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2211 | ||
5c5659d0 MB |
2212 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2213 | { | |
2214 | int ret; | |
2215 | ||
2216 | trace_regulator_disable(rdev_get_name(rdev)); | |
2217 | ||
967cfb18 | 2218 | if (rdev->ena_pin) { |
29d62ec5 DA |
2219 | if (rdev->ena_gpio_state) { |
2220 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2221 | if (ret < 0) | |
2222 | return ret; | |
2223 | rdev->ena_gpio_state = 0; | |
2224 | } | |
5c5659d0 MB |
2225 | |
2226 | } else if (rdev->desc->ops->disable) { | |
2227 | ret = rdev->desc->ops->disable(rdev); | |
2228 | if (ret != 0) | |
2229 | return ret; | |
2230 | } | |
2231 | ||
871f5650 GX |
2232 | /* cares about last_off_jiffy only if off_on_delay is required by |
2233 | * device. | |
2234 | */ | |
2235 | if (rdev->desc->off_on_delay) | |
2236 | rdev->last_off_jiffy = jiffies; | |
2237 | ||
5c5659d0 MB |
2238 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2239 | ||
5c5659d0 MB |
2240 | return 0; |
2241 | } | |
2242 | ||
414c70cb | 2243 | /* locks held by regulator_disable() */ |
3801b86a | 2244 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2245 | { |
2246 | int ret = 0; | |
2247 | ||
70cfef26 KK |
2248 | lockdep_assert_held_once(&rdev->mutex); |
2249 | ||
cd94b505 | 2250 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2251 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2252 | return -EIO; |
2253 | ||
414c70cb | 2254 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2255 | if (rdev->use_count == 1 && |
2256 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2257 | |
2258 | /* we are last user */ | |
8a34e979 | 2259 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2260 | ret = _notifier_call_chain(rdev, |
2261 | REGULATOR_EVENT_PRE_DISABLE, | |
2262 | NULL); | |
2263 | if (ret & NOTIFY_STOP_MASK) | |
2264 | return -EINVAL; | |
2265 | ||
5c5659d0 | 2266 | ret = _regulator_do_disable(rdev); |
414c70cb | 2267 | if (ret < 0) { |
5da84fd9 | 2268 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2269 | _notifier_call_chain(rdev, |
2270 | REGULATOR_EVENT_ABORT_DISABLE, | |
2271 | NULL); | |
414c70cb LG |
2272 | return ret; |
2273 | } | |
66fda75f MP |
2274 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2275 | NULL); | |
414c70cb LG |
2276 | } |
2277 | ||
414c70cb LG |
2278 | rdev->use_count = 0; |
2279 | } else if (rdev->use_count > 1) { | |
8a34e979 | 2280 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
414c70cb LG |
2281 | drms_uA_update(rdev); |
2282 | ||
2283 | rdev->use_count--; | |
2284 | } | |
3801b86a | 2285 | |
414c70cb LG |
2286 | return ret; |
2287 | } | |
2288 | ||
2289 | /** | |
2290 | * regulator_disable - disable regulator output | |
2291 | * @regulator: regulator source | |
2292 | * | |
cf7bbcdf MB |
2293 | * Disable the regulator output voltage or current. Calls to |
2294 | * regulator_enable() must be balanced with calls to | |
2295 | * regulator_disable(). | |
69279fb9 | 2296 | * |
414c70cb | 2297 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2298 | * devices have it enabled, the regulator device supports disabling and |
2299 | * machine constraints permit this operation. | |
414c70cb LG |
2300 | */ |
2301 | int regulator_disable(struct regulator *regulator) | |
2302 | { | |
412aec61 DB |
2303 | struct regulator_dev *rdev = regulator->rdev; |
2304 | int ret = 0; | |
414c70cb | 2305 | |
6492bc1b MB |
2306 | if (regulator->always_on) |
2307 | return 0; | |
2308 | ||
412aec61 | 2309 | mutex_lock(&rdev->mutex); |
3801b86a | 2310 | ret = _regulator_disable(rdev); |
412aec61 | 2311 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2312 | |
3801b86a MB |
2313 | if (ret == 0 && rdev->supply) |
2314 | regulator_disable(rdev->supply); | |
8cbf811d | 2315 | |
414c70cb LG |
2316 | return ret; |
2317 | } | |
2318 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2319 | ||
2320 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2321 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2322 | { |
2323 | int ret = 0; | |
2324 | ||
70cfef26 KK |
2325 | lockdep_assert_held_once(&rdev->mutex); |
2326 | ||
a1c8a551 RF |
2327 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2328 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2329 | if (ret & NOTIFY_STOP_MASK) | |
2330 | return -EINVAL; | |
2331 | ||
66fda75f MP |
2332 | ret = _regulator_do_disable(rdev); |
2333 | if (ret < 0) { | |
2334 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2335 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2336 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2337 | return ret; |
414c70cb LG |
2338 | } |
2339 | ||
66fda75f MP |
2340 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2341 | REGULATOR_EVENT_DISABLE, NULL); | |
2342 | ||
2343 | return 0; | |
414c70cb LG |
2344 | } |
2345 | ||
2346 | /** | |
2347 | * regulator_force_disable - force disable regulator output | |
2348 | * @regulator: regulator source | |
2349 | * | |
2350 | * Forcibly disable the regulator output voltage or current. | |
2351 | * NOTE: this *will* disable the regulator output even if other consumer | |
2352 | * devices have it enabled. This should be used for situations when device | |
2353 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2354 | */ | |
2355 | int regulator_force_disable(struct regulator *regulator) | |
2356 | { | |
82d15839 | 2357 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2358 | int ret; |
2359 | ||
82d15839 | 2360 | mutex_lock(&rdev->mutex); |
414c70cb | 2361 | regulator->uA_load = 0; |
3801b86a | 2362 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2363 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2364 | |
3801b86a MB |
2365 | if (rdev->supply) |
2366 | while (rdev->open_count--) | |
2367 | regulator_disable(rdev->supply); | |
8cbf811d | 2368 | |
414c70cb LG |
2369 | return ret; |
2370 | } | |
2371 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2372 | ||
da07ecd9 MB |
2373 | static void regulator_disable_work(struct work_struct *work) |
2374 | { | |
2375 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2376 | disable_work.work); | |
2377 | int count, i, ret; | |
2378 | ||
2379 | mutex_lock(&rdev->mutex); | |
2380 | ||
2381 | BUG_ON(!rdev->deferred_disables); | |
2382 | ||
2383 | count = rdev->deferred_disables; | |
2384 | rdev->deferred_disables = 0; | |
2385 | ||
2386 | for (i = 0; i < count; i++) { | |
2387 | ret = _regulator_disable(rdev); | |
2388 | if (ret != 0) | |
2389 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2390 | } | |
2391 | ||
2392 | mutex_unlock(&rdev->mutex); | |
2393 | ||
2394 | if (rdev->supply) { | |
2395 | for (i = 0; i < count; i++) { | |
2396 | ret = regulator_disable(rdev->supply); | |
2397 | if (ret != 0) { | |
2398 | rdev_err(rdev, | |
2399 | "Supply disable failed: %d\n", ret); | |
2400 | } | |
2401 | } | |
2402 | } | |
2403 | } | |
2404 | ||
2405 | /** | |
2406 | * regulator_disable_deferred - disable regulator output with delay | |
2407 | * @regulator: regulator source | |
2408 | * @ms: miliseconds until the regulator is disabled | |
2409 | * | |
2410 | * Execute regulator_disable() on the regulator after a delay. This | |
2411 | * is intended for use with devices that require some time to quiesce. | |
2412 | * | |
2413 | * NOTE: this will only disable the regulator output if no other consumer | |
2414 | * devices have it enabled, the regulator device supports disabling and | |
2415 | * machine constraints permit this operation. | |
2416 | */ | |
2417 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2418 | { | |
2419 | struct regulator_dev *rdev = regulator->rdev; | |
2420 | ||
6492bc1b MB |
2421 | if (regulator->always_on) |
2422 | return 0; | |
2423 | ||
2b5a24a0 MB |
2424 | if (!ms) |
2425 | return regulator_disable(regulator); | |
2426 | ||
da07ecd9 MB |
2427 | mutex_lock(&rdev->mutex); |
2428 | rdev->deferred_disables++; | |
2429 | mutex_unlock(&rdev->mutex); | |
2430 | ||
70dc6daf DC |
2431 | queue_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2432 | msecs_to_jiffies(ms)); | |
2433 | return 0; | |
da07ecd9 MB |
2434 | } |
2435 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2436 | ||
414c70cb LG |
2437 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2438 | { | |
65f73508 | 2439 | /* A GPIO control always takes precedence */ |
7b74d149 | 2440 | if (rdev->ena_pin) |
65f73508 MB |
2441 | return rdev->ena_gpio_state; |
2442 | ||
9a7f6a4c | 2443 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2444 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2445 | return 1; |
414c70cb | 2446 | |
9332546f | 2447 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2448 | } |
2449 | ||
3a40cfc3 SH |
2450 | static int _regulator_list_voltage(struct regulator *regulator, |
2451 | unsigned selector, int lock) | |
2452 | { | |
2453 | struct regulator_dev *rdev = regulator->rdev; | |
2454 | const struct regulator_ops *ops = rdev->desc->ops; | |
2455 | int ret; | |
2456 | ||
2457 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2458 | return rdev->desc->fixed_uV; | |
2459 | ||
2460 | if (ops->list_voltage) { | |
2461 | if (selector >= rdev->desc->n_voltages) | |
2462 | return -EINVAL; | |
2463 | if (lock) | |
2464 | mutex_lock(&rdev->mutex); | |
2465 | ret = ops->list_voltage(rdev, selector); | |
2466 | if (lock) | |
2467 | mutex_unlock(&rdev->mutex); | |
2468 | } else if (rdev->supply) { | |
2469 | ret = _regulator_list_voltage(rdev->supply, selector, lock); | |
2470 | } else { | |
2471 | return -EINVAL; | |
2472 | } | |
2473 | ||
2474 | if (ret > 0) { | |
2475 | if (ret < rdev->constraints->min_uV) | |
2476 | ret = 0; | |
2477 | else if (ret > rdev->constraints->max_uV) | |
2478 | ret = 0; | |
2479 | } | |
2480 | ||
2481 | return ret; | |
2482 | } | |
2483 | ||
414c70cb LG |
2484 | /** |
2485 | * regulator_is_enabled - is the regulator output enabled | |
2486 | * @regulator: regulator source | |
2487 | * | |
412aec61 DB |
2488 | * Returns positive if the regulator driver backing the source/client |
2489 | * has requested that the device be enabled, zero if it hasn't, else a | |
2490 | * negative errno code. | |
2491 | * | |
2492 | * Note that the device backing this regulator handle can have multiple | |
2493 | * users, so it might be enabled even if regulator_enable() was never | |
2494 | * called for this particular source. | |
414c70cb LG |
2495 | */ |
2496 | int regulator_is_enabled(struct regulator *regulator) | |
2497 | { | |
9332546f MB |
2498 | int ret; |
2499 | ||
6492bc1b MB |
2500 | if (regulator->always_on) |
2501 | return 1; | |
2502 | ||
9332546f MB |
2503 | mutex_lock(®ulator->rdev->mutex); |
2504 | ret = _regulator_is_enabled(regulator->rdev); | |
2505 | mutex_unlock(®ulator->rdev->mutex); | |
2506 | ||
2507 | return ret; | |
414c70cb LG |
2508 | } |
2509 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2510 | ||
d1e7de30 MS |
2511 | /** |
2512 | * regulator_can_change_voltage - check if regulator can change voltage | |
2513 | * @regulator: regulator source | |
2514 | * | |
2515 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2516 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2517 | * or dummy regulators and disabling voltage change logic in the client |
2518 | * driver. | |
2519 | */ | |
2520 | int regulator_can_change_voltage(struct regulator *regulator) | |
2521 | { | |
2522 | struct regulator_dev *rdev = regulator->rdev; | |
2523 | ||
8a34e979 | 2524 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
19280e40 AL |
2525 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) |
2526 | return 1; | |
2527 | ||
2528 | if (rdev->desc->continuous_voltage_range && | |
2529 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2530 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2531 | return 1; | |
2532 | } | |
d1e7de30 MS |
2533 | |
2534 | return 0; | |
2535 | } | |
2536 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2537 | ||
4367cfdc DB |
2538 | /** |
2539 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2540 | * @regulator: regulator source | |
2541 | * | |
2542 | * Returns number of selectors, or negative errno. Selectors are | |
2543 | * numbered starting at zero, and typically correspond to bitfields | |
2544 | * in hardware registers. | |
2545 | */ | |
2546 | int regulator_count_voltages(struct regulator *regulator) | |
2547 | { | |
2548 | struct regulator_dev *rdev = regulator->rdev; | |
2549 | ||
26988efe JMC |
2550 | if (rdev->desc->n_voltages) |
2551 | return rdev->desc->n_voltages; | |
2552 | ||
2553 | if (!rdev->supply) | |
2554 | return -EINVAL; | |
2555 | ||
2556 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2557 | } |
2558 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2559 | ||
2560 | /** | |
2561 | * regulator_list_voltage - enumerate supported voltages | |
2562 | * @regulator: regulator source | |
2563 | * @selector: identify voltage to list | |
2564 | * Context: can sleep | |
2565 | * | |
2566 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2567 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2568 | * negative errno. |
2569 | */ | |
2570 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2571 | { | |
3a40cfc3 | 2572 | return _regulator_list_voltage(regulator, selector, 1); |
4367cfdc DB |
2573 | } |
2574 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2575 | ||
04eca28c TT |
2576 | /** |
2577 | * regulator_get_regmap - get the regulator's register map | |
2578 | * @regulator: regulator source | |
2579 | * | |
2580 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2581 | * if the regulator doesn't use regmap. | |
2582 | */ | |
2583 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2584 | { | |
2585 | struct regmap *map = regulator->rdev->regmap; | |
2586 | ||
2587 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2588 | } | |
2589 | ||
2590 | /** | |
2591 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2592 | * @regulator: regulator source | |
2593 | * @vsel_reg: voltage selector register, output parameter | |
2594 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2595 | * | |
2596 | * Returns the hardware register offset and bitmask used for setting the | |
2597 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2598 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2599 | * for example. | |
2600 | * | |
2601 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2602 | * and 0 is returned, otherwise a negative errno is returned. | |
2603 | */ | |
2604 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2605 | unsigned *vsel_reg, | |
2606 | unsigned *vsel_mask) | |
2607 | { | |
39f5460d GX |
2608 | struct regulator_dev *rdev = regulator->rdev; |
2609 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2610 | |
2611 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2612 | return -EOPNOTSUPP; | |
2613 | ||
2614 | *vsel_reg = rdev->desc->vsel_reg; | |
2615 | *vsel_mask = rdev->desc->vsel_mask; | |
2616 | ||
2617 | return 0; | |
2618 | } | |
2619 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2620 | ||
2621 | /** | |
2622 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2623 | * @regulator: regulator source | |
2624 | * @selector: identify voltage to list | |
2625 | * | |
2626 | * Converts the selector to a hardware-specific voltage selector that can be | |
2627 | * directly written to the regulator registers. The address of the voltage | |
2628 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2629 | * | |
2630 | * On error a negative errno is returned. | |
2631 | */ | |
2632 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2633 | unsigned selector) | |
2634 | { | |
39f5460d GX |
2635 | struct regulator_dev *rdev = regulator->rdev; |
2636 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2637 | |
2638 | if (selector >= rdev->desc->n_voltages) | |
2639 | return -EINVAL; | |
2640 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2641 | return -EOPNOTSUPP; | |
2642 | ||
2643 | return selector; | |
2644 | } | |
2645 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2646 | ||
2a668a8b PW |
2647 | /** |
2648 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2649 | * @regulator: regulator source | |
2650 | * | |
2651 | * Returns the voltage step size between VSEL values for linear | |
2652 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2653 | */ | |
2654 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2655 | { | |
2656 | struct regulator_dev *rdev = regulator->rdev; | |
2657 | ||
2658 | return rdev->desc->uV_step; | |
2659 | } | |
2660 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2661 | ||
a7a1ad90 MB |
2662 | /** |
2663 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2664 | * | |
2665 | * @regulator: Regulator to check. | |
2666 | * @min_uV: Minimum required voltage in uV. | |
2667 | * @max_uV: Maximum required voltage in uV. | |
2668 | * | |
2669 | * Returns a boolean or a negative error code. | |
2670 | */ | |
2671 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2672 | int min_uV, int max_uV) | |
2673 | { | |
c5f3939b | 2674 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2675 | int i, voltages, ret; |
2676 | ||
c5f3939b | 2677 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 2678 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
2679 | ret = regulator_get_voltage(regulator); |
2680 | if (ret >= 0) | |
0d25d09d | 2681 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2682 | else |
2683 | return ret; | |
2684 | } | |
2685 | ||
bd7a2b60 PM |
2686 | /* Any voltage within constrains range is fine? */ |
2687 | if (rdev->desc->continuous_voltage_range) | |
2688 | return min_uV >= rdev->constraints->min_uV && | |
2689 | max_uV <= rdev->constraints->max_uV; | |
2690 | ||
a7a1ad90 MB |
2691 | ret = regulator_count_voltages(regulator); |
2692 | if (ret < 0) | |
2693 | return ret; | |
2694 | voltages = ret; | |
2695 | ||
2696 | for (i = 0; i < voltages; i++) { | |
2697 | ret = regulator_list_voltage(regulator, i); | |
2698 | ||
2699 | if (ret >= min_uV && ret <= max_uV) | |
2700 | return 1; | |
2701 | } | |
2702 | ||
2703 | return 0; | |
2704 | } | |
a398eaa2 | 2705 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2706 | |
a204f41e SH |
2707 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
2708 | int max_uV) | |
2709 | { | |
2710 | const struct regulator_desc *desc = rdev->desc; | |
2711 | ||
2712 | if (desc->ops->map_voltage) | |
2713 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
2714 | ||
2715 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
2716 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
2717 | ||
2718 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
2719 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
2720 | ||
2721 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); | |
2722 | } | |
2723 | ||
7179569a HS |
2724 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2725 | int min_uV, int max_uV, | |
2726 | unsigned *selector) | |
2727 | { | |
2728 | struct pre_voltage_change_data data; | |
2729 | int ret; | |
2730 | ||
2731 | data.old_uV = _regulator_get_voltage(rdev); | |
2732 | data.min_uV = min_uV; | |
2733 | data.max_uV = max_uV; | |
2734 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2735 | &data); | |
2736 | if (ret & NOTIFY_STOP_MASK) | |
2737 | return -EINVAL; | |
2738 | ||
2739 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2740 | if (ret >= 0) | |
2741 | return ret; | |
2742 | ||
2743 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2744 | (void *)data.old_uV); | |
2745 | ||
2746 | return ret; | |
2747 | } | |
2748 | ||
2749 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2750 | int uV, unsigned selector) | |
2751 | { | |
2752 | struct pre_voltage_change_data data; | |
2753 | int ret; | |
2754 | ||
2755 | data.old_uV = _regulator_get_voltage(rdev); | |
2756 | data.min_uV = uV; | |
2757 | data.max_uV = uV; | |
2758 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2759 | &data); | |
2760 | if (ret & NOTIFY_STOP_MASK) | |
2761 | return -EINVAL; | |
2762 | ||
2763 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2764 | if (ret >= 0) | |
2765 | return ret; | |
2766 | ||
2767 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2768 | (void *)data.old_uV); | |
2769 | ||
2770 | return ret; | |
2771 | } | |
2772 | ||
75790251 MB |
2773 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2774 | int min_uV, int max_uV) | |
2775 | { | |
2776 | int ret; | |
77af1b26 | 2777 | int delay = 0; |
e113d792 | 2778 | int best_val = 0; |
75790251 | 2779 | unsigned int selector; |
eba41a5e | 2780 | int old_selector = -1; |
75790251 MB |
2781 | |
2782 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2783 | ||
bf5892a8 MB |
2784 | min_uV += rdev->constraints->uV_offset; |
2785 | max_uV += rdev->constraints->uV_offset; | |
2786 | ||
eba41a5e AL |
2787 | /* |
2788 | * If we can't obtain the old selector there is not enough | |
2789 | * info to call set_voltage_time_sel(). | |
2790 | */ | |
8b7485ef AL |
2791 | if (_regulator_is_enabled(rdev) && |
2792 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2793 | rdev->desc->ops->get_voltage_sel) { |
2794 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2795 | if (old_selector < 0) | |
2796 | return old_selector; | |
2797 | } | |
2798 | ||
75790251 | 2799 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2800 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2801 | &selector); | |
e113d792 MB |
2802 | |
2803 | if (ret >= 0) { | |
2804 | if (rdev->desc->ops->list_voltage) | |
2805 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2806 | selector); | |
2807 | else | |
2808 | best_val = _regulator_get_voltage(rdev); | |
2809 | } | |
2810 | ||
e8eef82b | 2811 | } else if (rdev->desc->ops->set_voltage_sel) { |
a204f41e | 2812 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 2813 | if (ret >= 0) { |
e113d792 MB |
2814 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2815 | if (min_uV <= best_val && max_uV >= best_val) { | |
2816 | selector = ret; | |
c66a566a AL |
2817 | if (old_selector == selector) |
2818 | ret = 0; | |
2819 | else | |
7179569a HS |
2820 | ret = _regulator_call_set_voltage_sel( |
2821 | rdev, best_val, selector); | |
e113d792 MB |
2822 | } else { |
2823 | ret = -EINVAL; | |
2824 | } | |
e8eef82b | 2825 | } |
75790251 MB |
2826 | } else { |
2827 | ret = -EINVAL; | |
2828 | } | |
e8eef82b | 2829 | |
eba41a5e | 2830 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2831 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2832 | && old_selector != selector) { | |
77af1b26 | 2833 | |
eba41a5e AL |
2834 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2835 | old_selector, selector); | |
2836 | if (delay < 0) { | |
2837 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2838 | delay); | |
2839 | delay = 0; | |
e8eef82b | 2840 | } |
75790251 | 2841 | |
8b96de31 PR |
2842 | /* Insert any necessary delays */ |
2843 | if (delay >= 1000) { | |
2844 | mdelay(delay / 1000); | |
2845 | udelay(delay % 1000); | |
2846 | } else if (delay) { | |
2847 | udelay(delay); | |
2848 | } | |
77af1b26 LW |
2849 | } |
2850 | ||
2f6c797f AL |
2851 | if (ret == 0 && best_val >= 0) { |
2852 | unsigned long data = best_val; | |
2853 | ||
ded06a52 | 2854 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2855 | (void *)data); |
2856 | } | |
ded06a52 | 2857 | |
eba41a5e | 2858 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2859 | |
2860 | return ret; | |
2861 | } | |
2862 | ||
a9f226bc SH |
2863 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
2864 | int min_uV, int max_uV) | |
414c70cb LG |
2865 | { |
2866 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2867 | int ret = 0; |
92d7a558 | 2868 | int old_min_uV, old_max_uV; |
c00dc359 | 2869 | int current_uV; |
fc42112c SH |
2870 | int best_supply_uV = 0; |
2871 | int supply_change_uV = 0; | |
414c70cb | 2872 | |
95a3c23a MB |
2873 | /* If we're setting the same range as last time the change |
2874 | * should be a noop (some cpufreq implementations use the same | |
2875 | * voltage for multiple frequencies, for example). | |
2876 | */ | |
2877 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2878 | goto out; | |
2879 | ||
c00dc359 | 2880 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 2881 | * return successfully even though the regulator does not support |
c00dc359 BA |
2882 | * changing the voltage. |
2883 | */ | |
8a34e979 | 2884 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c00dc359 BA |
2885 | current_uV = _regulator_get_voltage(rdev); |
2886 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2887 | regulator->min_uV = min_uV; | |
2888 | regulator->max_uV = max_uV; | |
2889 | goto out; | |
2890 | } | |
2891 | } | |
2892 | ||
414c70cb | 2893 | /* sanity check */ |
e8eef82b MB |
2894 | if (!rdev->desc->ops->set_voltage && |
2895 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2896 | ret = -EINVAL; |
2897 | goto out; | |
2898 | } | |
2899 | ||
2900 | /* constraints check */ | |
2901 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2902 | if (ret < 0) | |
2903 | goto out; | |
0d25d09d | 2904 | |
92d7a558 PP |
2905 | /* restore original values in case of error */ |
2906 | old_min_uV = regulator->min_uV; | |
2907 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2908 | regulator->min_uV = min_uV; |
2909 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2910 | |
05fda3b1 TP |
2911 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2912 | if (ret < 0) | |
92d7a558 | 2913 | goto out2; |
05fda3b1 | 2914 | |
fc42112c SH |
2915 | if (rdev->supply && (rdev->desc->min_dropout_uV || |
2916 | !rdev->desc->ops->get_voltage)) { | |
2917 | int current_supply_uV; | |
2918 | int selector; | |
2919 | ||
2920 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
2921 | if (selector < 0) { | |
2922 | ret = selector; | |
2923 | goto out2; | |
2924 | } | |
2925 | ||
2926 | best_supply_uV = _regulator_list_voltage(regulator, selector, 0); | |
2927 | if (best_supply_uV < 0) { | |
2928 | ret = best_supply_uV; | |
2929 | goto out2; | |
2930 | } | |
2931 | ||
2932 | best_supply_uV += rdev->desc->min_dropout_uV; | |
2933 | ||
2934 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
2935 | if (current_supply_uV < 0) { | |
2936 | ret = current_supply_uV; | |
2937 | goto out2; | |
2938 | } | |
2939 | ||
2940 | supply_change_uV = best_supply_uV - current_supply_uV; | |
2941 | } | |
2942 | ||
2943 | if (supply_change_uV > 0) { | |
2944 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
2945 | best_supply_uV, INT_MAX); | |
2946 | if (ret) { | |
2947 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
2948 | ret); | |
2949 | goto out2; | |
2950 | } | |
2951 | } | |
2952 | ||
75790251 | 2953 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2954 | if (ret < 0) |
2955 | goto out2; | |
0d25d09d | 2956 | |
fc42112c SH |
2957 | if (supply_change_uV < 0) { |
2958 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
2959 | best_supply_uV, INT_MAX); | |
2960 | if (ret) | |
2961 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
2962 | ret); | |
2963 | /* No need to fail here */ | |
2964 | ret = 0; | |
2965 | } | |
2966 | ||
414c70cb | 2967 | out: |
414c70cb | 2968 | return ret; |
92d7a558 PP |
2969 | out2: |
2970 | regulator->min_uV = old_min_uV; | |
2971 | regulator->max_uV = old_max_uV; | |
a9f226bc SH |
2972 | |
2973 | return ret; | |
2974 | } | |
2975 | ||
2976 | /** | |
2977 | * regulator_set_voltage - set regulator output voltage | |
2978 | * @regulator: regulator source | |
2979 | * @min_uV: Minimum required voltage in uV | |
2980 | * @max_uV: Maximum acceptable voltage in uV | |
2981 | * | |
2982 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2983 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2984 | * | |
2985 | * If the regulator is enabled then the voltage will change to the new value | |
2986 | * immediately otherwise if the regulator is disabled the regulator will | |
2987 | * output at the new voltage when enabled. | |
2988 | * | |
2989 | * NOTE: If the regulator is shared between several devices then the lowest | |
2990 | * request voltage that meets the system constraints will be used. | |
2991 | * Regulator system constraints must be set for this regulator before | |
2992 | * calling this function otherwise this call will fail. | |
2993 | */ | |
2994 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2995 | { | |
2996 | int ret = 0; | |
2997 | ||
fc42112c | 2998 | regulator_lock_supply(regulator->rdev); |
a9f226bc SH |
2999 | |
3000 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV); | |
3001 | ||
fc42112c | 3002 | regulator_unlock_supply(regulator->rdev); |
a9f226bc | 3003 | |
414c70cb LG |
3004 | return ret; |
3005 | } | |
3006 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3007 | ||
88cd222b LW |
3008 | /** |
3009 | * regulator_set_voltage_time - get raise/fall time | |
3010 | * @regulator: regulator source | |
3011 | * @old_uV: starting voltage in microvolts | |
3012 | * @new_uV: target voltage in microvolts | |
3013 | * | |
3014 | * Provided with the starting and ending voltage, this function attempts to | |
3015 | * calculate the time in microseconds required to rise or fall to this new | |
3016 | * voltage. | |
3017 | */ | |
3018 | int regulator_set_voltage_time(struct regulator *regulator, | |
3019 | int old_uV, int new_uV) | |
3020 | { | |
272e2315 GX |
3021 | struct regulator_dev *rdev = regulator->rdev; |
3022 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3023 | int old_sel = -1; |
3024 | int new_sel = -1; | |
3025 | int voltage; | |
3026 | int i; | |
3027 | ||
3028 | /* Currently requires operations to do this */ | |
3029 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
3030 | || !rdev->desc->n_voltages) | |
3031 | return -EINVAL; | |
3032 | ||
3033 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3034 | /* We only look for exact voltage matches here */ | |
3035 | voltage = regulator_list_voltage(regulator, i); | |
3036 | if (voltage < 0) | |
3037 | return -EINVAL; | |
3038 | if (voltage == 0) | |
3039 | continue; | |
3040 | if (voltage == old_uV) | |
3041 | old_sel = i; | |
3042 | if (voltage == new_uV) | |
3043 | new_sel = i; | |
3044 | } | |
3045 | ||
3046 | if (old_sel < 0 || new_sel < 0) | |
3047 | return -EINVAL; | |
3048 | ||
3049 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3050 | } | |
3051 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3052 | ||
98a175b6 | 3053 | /** |
296c6566 RD |
3054 | * regulator_set_voltage_time_sel - get raise/fall time |
3055 | * @rdev: regulator source device | |
98a175b6 YSB |
3056 | * @old_selector: selector for starting voltage |
3057 | * @new_selector: selector for target voltage | |
3058 | * | |
3059 | * Provided with the starting and target voltage selectors, this function | |
3060 | * returns time in microseconds required to rise or fall to this new voltage | |
3061 | * | |
f11d08c3 | 3062 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3063 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3064 | */ |
3065 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3066 | unsigned int old_selector, | |
3067 | unsigned int new_selector) | |
3068 | { | |
398715ab | 3069 | unsigned int ramp_delay = 0; |
f11d08c3 | 3070 | int old_volt, new_volt; |
398715ab AL |
3071 | |
3072 | if (rdev->constraints->ramp_delay) | |
3073 | ramp_delay = rdev->constraints->ramp_delay; | |
3074 | else if (rdev->desc->ramp_delay) | |
3075 | ramp_delay = rdev->desc->ramp_delay; | |
3076 | ||
3077 | if (ramp_delay == 0) { | |
6f0b2c69 | 3078 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 3079 | return 0; |
6f0b2c69 | 3080 | } |
398715ab | 3081 | |
f11d08c3 AL |
3082 | /* sanity check */ |
3083 | if (!rdev->desc->ops->list_voltage) | |
3084 | return -EINVAL; | |
398715ab | 3085 | |
f11d08c3 AL |
3086 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3087 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3088 | ||
3089 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 3090 | } |
b19dbf71 | 3091 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3092 | |
606a2562 MB |
3093 | /** |
3094 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3095 | * @regulator: regulator source | |
3096 | * | |
3097 | * Re-apply the last configured voltage. This is intended to be used | |
3098 | * where some external control source the consumer is cooperating with | |
3099 | * has caused the configured voltage to change. | |
3100 | */ | |
3101 | int regulator_sync_voltage(struct regulator *regulator) | |
3102 | { | |
3103 | struct regulator_dev *rdev = regulator->rdev; | |
3104 | int ret, min_uV, max_uV; | |
3105 | ||
3106 | mutex_lock(&rdev->mutex); | |
3107 | ||
3108 | if (!rdev->desc->ops->set_voltage && | |
3109 | !rdev->desc->ops->set_voltage_sel) { | |
3110 | ret = -EINVAL; | |
3111 | goto out; | |
3112 | } | |
3113 | ||
3114 | /* This is only going to work if we've had a voltage configured. */ | |
3115 | if (!regulator->min_uV && !regulator->max_uV) { | |
3116 | ret = -EINVAL; | |
3117 | goto out; | |
3118 | } | |
3119 | ||
3120 | min_uV = regulator->min_uV; | |
3121 | max_uV = regulator->max_uV; | |
3122 | ||
3123 | /* This should be a paranoia check... */ | |
3124 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3125 | if (ret < 0) | |
3126 | goto out; | |
3127 | ||
3128 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
3129 | if (ret < 0) | |
3130 | goto out; | |
3131 | ||
3132 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3133 | ||
3134 | out: | |
3135 | mutex_unlock(&rdev->mutex); | |
3136 | return ret; | |
3137 | } | |
3138 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3139 | ||
414c70cb LG |
3140 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3141 | { | |
bf5892a8 | 3142 | int sel, ret; |
fef95019 MB |
3143 | bool bypassed; |
3144 | ||
3145 | if (rdev->desc->ops->get_bypass) { | |
3146 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
3147 | if (ret < 0) | |
3148 | return ret; | |
3149 | if (bypassed) { | |
3150 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
3151 | if (!rdev->supply) { |
3152 | rdev_err(rdev, | |
3153 | "bypassed regulator has no supply!\n"); | |
3154 | return -EPROBE_DEFER; | |
3155 | } | |
fef95019 MB |
3156 | |
3157 | return _regulator_get_voltage(rdev->supply->rdev); | |
3158 | } | |
3159 | } | |
476c2d83 MB |
3160 | |
3161 | if (rdev->desc->ops->get_voltage_sel) { | |
3162 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3163 | if (sel < 0) | |
3164 | return sel; | |
bf5892a8 | 3165 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3166 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3167 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3168 | } else if (rdev->desc->ops->list_voltage) { |
3169 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3170 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3171 | ret = rdev->desc->fixed_uV; | |
e303996e | 3172 | } else if (rdev->supply) { |
d9b96d35 | 3173 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3174 | } else { |
414c70cb | 3175 | return -EINVAL; |
cb220d16 | 3176 | } |
bf5892a8 | 3177 | |
cb220d16 AL |
3178 | if (ret < 0) |
3179 | return ret; | |
bf5892a8 | 3180 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3181 | } |
3182 | ||
3183 | /** | |
3184 | * regulator_get_voltage - get regulator output voltage | |
3185 | * @regulator: regulator source | |
3186 | * | |
3187 | * This returns the current regulator voltage in uV. | |
3188 | * | |
3189 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
3190 | * function should not be used to determine regulator state. | |
3191 | */ | |
3192 | int regulator_get_voltage(struct regulator *regulator) | |
3193 | { | |
3194 | int ret; | |
3195 | ||
d9b96d35 | 3196 | regulator_lock_supply(regulator->rdev); |
414c70cb LG |
3197 | |
3198 | ret = _regulator_get_voltage(regulator->rdev); | |
3199 | ||
d9b96d35 | 3200 | regulator_unlock_supply(regulator->rdev); |
414c70cb LG |
3201 | |
3202 | return ret; | |
3203 | } | |
3204 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
3205 | ||
3206 | /** | |
3207 | * regulator_set_current_limit - set regulator output current limit | |
3208 | * @regulator: regulator source | |
ce0d10f8 | 3209 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
3210 | * @max_uA: Maximum supported current in uA |
3211 | * | |
3212 | * Sets current sink to the desired output current. This can be set during | |
3213 | * any regulator state. IOW, regulator can be disabled or enabled. | |
3214 | * | |
3215 | * If the regulator is enabled then the current will change to the new value | |
3216 | * immediately otherwise if the regulator is disabled the regulator will | |
3217 | * output at the new current when enabled. | |
3218 | * | |
3219 | * NOTE: Regulator system constraints must be set for this regulator before | |
3220 | * calling this function otherwise this call will fail. | |
3221 | */ | |
3222 | int regulator_set_current_limit(struct regulator *regulator, | |
3223 | int min_uA, int max_uA) | |
3224 | { | |
3225 | struct regulator_dev *rdev = regulator->rdev; | |
3226 | int ret; | |
3227 | ||
3228 | mutex_lock(&rdev->mutex); | |
3229 | ||
3230 | /* sanity check */ | |
3231 | if (!rdev->desc->ops->set_current_limit) { | |
3232 | ret = -EINVAL; | |
3233 | goto out; | |
3234 | } | |
3235 | ||
3236 | /* constraints check */ | |
3237 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
3238 | if (ret < 0) | |
3239 | goto out; | |
3240 | ||
3241 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
3242 | out: | |
3243 | mutex_unlock(&rdev->mutex); | |
3244 | return ret; | |
3245 | } | |
3246 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
3247 | ||
3248 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
3249 | { | |
3250 | int ret; | |
3251 | ||
3252 | mutex_lock(&rdev->mutex); | |
3253 | ||
3254 | /* sanity check */ | |
3255 | if (!rdev->desc->ops->get_current_limit) { | |
3256 | ret = -EINVAL; | |
3257 | goto out; | |
3258 | } | |
3259 | ||
3260 | ret = rdev->desc->ops->get_current_limit(rdev); | |
3261 | out: | |
3262 | mutex_unlock(&rdev->mutex); | |
3263 | return ret; | |
3264 | } | |
3265 | ||
3266 | /** | |
3267 | * regulator_get_current_limit - get regulator output current | |
3268 | * @regulator: regulator source | |
3269 | * | |
3270 | * This returns the current supplied by the specified current sink in uA. | |
3271 | * | |
3272 | * NOTE: If the regulator is disabled it will return the current value. This | |
3273 | * function should not be used to determine regulator state. | |
3274 | */ | |
3275 | int regulator_get_current_limit(struct regulator *regulator) | |
3276 | { | |
3277 | return _regulator_get_current_limit(regulator->rdev); | |
3278 | } | |
3279 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
3280 | ||
3281 | /** | |
3282 | * regulator_set_mode - set regulator operating mode | |
3283 | * @regulator: regulator source | |
3284 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
3285 | * | |
3286 | * Set regulator operating mode to increase regulator efficiency or improve | |
3287 | * regulation performance. | |
3288 | * | |
3289 | * NOTE: Regulator system constraints must be set for this regulator before | |
3290 | * calling this function otherwise this call will fail. | |
3291 | */ | |
3292 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3293 | { | |
3294 | struct regulator_dev *rdev = regulator->rdev; | |
3295 | int ret; | |
500b4ac9 | 3296 | int regulator_curr_mode; |
414c70cb LG |
3297 | |
3298 | mutex_lock(&rdev->mutex); | |
3299 | ||
3300 | /* sanity check */ | |
3301 | if (!rdev->desc->ops->set_mode) { | |
3302 | ret = -EINVAL; | |
3303 | goto out; | |
3304 | } | |
3305 | ||
500b4ac9 SI |
3306 | /* return if the same mode is requested */ |
3307 | if (rdev->desc->ops->get_mode) { | |
3308 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3309 | if (regulator_curr_mode == mode) { | |
3310 | ret = 0; | |
3311 | goto out; | |
3312 | } | |
3313 | } | |
3314 | ||
414c70cb | 3315 | /* constraints check */ |
22c51b47 | 3316 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3317 | if (ret < 0) |
3318 | goto out; | |
3319 | ||
3320 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3321 | out: | |
3322 | mutex_unlock(&rdev->mutex); | |
3323 | return ret; | |
3324 | } | |
3325 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3326 | ||
3327 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3328 | { | |
3329 | int ret; | |
3330 | ||
3331 | mutex_lock(&rdev->mutex); | |
3332 | ||
3333 | /* sanity check */ | |
3334 | if (!rdev->desc->ops->get_mode) { | |
3335 | ret = -EINVAL; | |
3336 | goto out; | |
3337 | } | |
3338 | ||
3339 | ret = rdev->desc->ops->get_mode(rdev); | |
3340 | out: | |
3341 | mutex_unlock(&rdev->mutex); | |
3342 | return ret; | |
3343 | } | |
3344 | ||
3345 | /** | |
3346 | * regulator_get_mode - get regulator operating mode | |
3347 | * @regulator: regulator source | |
3348 | * | |
3349 | * Get the current regulator operating mode. | |
3350 | */ | |
3351 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3352 | { | |
3353 | return _regulator_get_mode(regulator->rdev); | |
3354 | } | |
3355 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3356 | ||
3357 | /** | |
e39ce48f | 3358 | * regulator_set_load - set regulator load |
414c70cb LG |
3359 | * @regulator: regulator source |
3360 | * @uA_load: load current | |
3361 | * | |
3362 | * Notifies the regulator core of a new device load. This is then used by | |
3363 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3364 | * operating mode for the new regulator loading. | |
3365 | * | |
3366 | * Consumer devices notify their supply regulator of the maximum power | |
3367 | * they will require (can be taken from device datasheet in the power | |
3368 | * consumption tables) when they change operational status and hence power | |
3369 | * state. Examples of operational state changes that can affect power | |
3370 | * consumption are :- | |
3371 | * | |
3372 | * o Device is opened / closed. | |
3373 | * o Device I/O is about to begin or has just finished. | |
3374 | * o Device is idling in between work. | |
3375 | * | |
3376 | * This information is also exported via sysfs to userspace. | |
3377 | * | |
3378 | * DRMS will sum the total requested load on the regulator and change | |
3379 | * to the most efficient operating mode if platform constraints allow. | |
3380 | * | |
e39ce48f | 3381 | * On error a negative errno is returned. |
414c70cb | 3382 | */ |
e39ce48f | 3383 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3384 | { |
3385 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3386 | int ret; |
d92d95b6 | 3387 | |
414c70cb | 3388 | mutex_lock(&rdev->mutex); |
414c70cb | 3389 | regulator->uA_load = uA_load; |
8460ef38 | 3390 | ret = drms_uA_update(rdev); |
414c70cb | 3391 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3392 | |
414c70cb LG |
3393 | return ret; |
3394 | } | |
e39ce48f | 3395 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3396 | |
f59c8f9f MB |
3397 | /** |
3398 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3399 | * | |
3400 | * @regulator: Regulator to configure | |
9345dfb8 | 3401 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3402 | * |
3403 | * Allow the regulator to go into bypass mode if all other consumers | |
3404 | * for the regulator also enable bypass mode and the machine | |
3405 | * constraints allow this. Bypass mode means that the regulator is | |
3406 | * simply passing the input directly to the output with no regulation. | |
3407 | */ | |
3408 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3409 | { | |
3410 | struct regulator_dev *rdev = regulator->rdev; | |
3411 | int ret = 0; | |
3412 | ||
3413 | if (!rdev->desc->ops->set_bypass) | |
3414 | return 0; | |
3415 | ||
8a34e979 | 3416 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
3417 | return 0; |
3418 | ||
3419 | mutex_lock(&rdev->mutex); | |
3420 | ||
3421 | if (enable && !regulator->bypass) { | |
3422 | rdev->bypass_count++; | |
3423 | ||
3424 | if (rdev->bypass_count == rdev->open_count) { | |
3425 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3426 | if (ret != 0) | |
3427 | rdev->bypass_count--; | |
3428 | } | |
3429 | ||
3430 | } else if (!enable && regulator->bypass) { | |
3431 | rdev->bypass_count--; | |
3432 | ||
3433 | if (rdev->bypass_count != rdev->open_count) { | |
3434 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3435 | if (ret != 0) | |
3436 | rdev->bypass_count++; | |
3437 | } | |
3438 | } | |
3439 | ||
3440 | if (ret == 0) | |
3441 | regulator->bypass = enable; | |
3442 | ||
3443 | mutex_unlock(&rdev->mutex); | |
3444 | ||
3445 | return ret; | |
3446 | } | |
3447 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3448 | ||
414c70cb LG |
3449 | /** |
3450 | * regulator_register_notifier - register regulator event notifier | |
3451 | * @regulator: regulator source | |
69279fb9 | 3452 | * @nb: notifier block |
414c70cb LG |
3453 | * |
3454 | * Register notifier block to receive regulator events. | |
3455 | */ | |
3456 | int regulator_register_notifier(struct regulator *regulator, | |
3457 | struct notifier_block *nb) | |
3458 | { | |
3459 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3460 | nb); | |
3461 | } | |
3462 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3463 | ||
3464 | /** | |
3465 | * regulator_unregister_notifier - unregister regulator event notifier | |
3466 | * @regulator: regulator source | |
69279fb9 | 3467 | * @nb: notifier block |
414c70cb LG |
3468 | * |
3469 | * Unregister regulator event notifier block. | |
3470 | */ | |
3471 | int regulator_unregister_notifier(struct regulator *regulator, | |
3472 | struct notifier_block *nb) | |
3473 | { | |
3474 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3475 | nb); | |
3476 | } | |
3477 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3478 | ||
b136fb44 JC |
3479 | /* notify regulator consumers and downstream regulator consumers. |
3480 | * Note mutex must be held by caller. | |
3481 | */ | |
7179569a | 3482 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3483 | unsigned long event, void *data) |
3484 | { | |
414c70cb | 3485 | /* call rdev chain first */ |
7179569a | 3486 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3487 | } |
3488 | ||
3489 | /** | |
3490 | * regulator_bulk_get - get multiple regulator consumers | |
3491 | * | |
3492 | * @dev: Device to supply | |
3493 | * @num_consumers: Number of consumers to register | |
3494 | * @consumers: Configuration of consumers; clients are stored here. | |
3495 | * | |
3496 | * @return 0 on success, an errno on failure. | |
3497 | * | |
3498 | * This helper function allows drivers to get several regulator | |
3499 | * consumers in one operation. If any of the regulators cannot be | |
3500 | * acquired then any regulators that were allocated will be freed | |
3501 | * before returning to the caller. | |
3502 | */ | |
3503 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3504 | struct regulator_bulk_data *consumers) | |
3505 | { | |
3506 | int i; | |
3507 | int ret; | |
3508 | ||
3509 | for (i = 0; i < num_consumers; i++) | |
3510 | consumers[i].consumer = NULL; | |
3511 | ||
3512 | for (i = 0; i < num_consumers; i++) { | |
3ff3f518 BA |
3513 | consumers[i].consumer = _regulator_get(dev, |
3514 | consumers[i].supply, | |
3515 | false, | |
3516 | !consumers[i].optional); | |
414c70cb | 3517 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 3518 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3519 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3520 | consumers[i].supply, ret); | |
414c70cb LG |
3521 | consumers[i].consumer = NULL; |
3522 | goto err; | |
3523 | } | |
3524 | } | |
3525 | ||
3526 | return 0; | |
3527 | ||
3528 | err: | |
b29c7690 | 3529 | while (--i >= 0) |
414c70cb LG |
3530 | regulator_put(consumers[i].consumer); |
3531 | ||
3532 | return ret; | |
3533 | } | |
3534 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3535 | ||
f21e0e81 MB |
3536 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3537 | { | |
3538 | struct regulator_bulk_data *bulk = data; | |
3539 | ||
3540 | bulk->ret = regulator_enable(bulk->consumer); | |
3541 | } | |
3542 | ||
414c70cb LG |
3543 | /** |
3544 | * regulator_bulk_enable - enable multiple regulator consumers | |
3545 | * | |
3546 | * @num_consumers: Number of consumers | |
3547 | * @consumers: Consumer data; clients are stored here. | |
3548 | * @return 0 on success, an errno on failure | |
3549 | * | |
3550 | * This convenience API allows consumers to enable multiple regulator | |
3551 | * clients in a single API call. If any consumers cannot be enabled | |
3552 | * then any others that were enabled will be disabled again prior to | |
3553 | * return. | |
3554 | */ | |
3555 | int regulator_bulk_enable(int num_consumers, | |
3556 | struct regulator_bulk_data *consumers) | |
3557 | { | |
2955b47d | 3558 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3559 | int i; |
f21e0e81 | 3560 | int ret = 0; |
414c70cb | 3561 | |
6492bc1b MB |
3562 | for (i = 0; i < num_consumers; i++) { |
3563 | if (consumers[i].consumer->always_on) | |
3564 | consumers[i].ret = 0; | |
3565 | else | |
3566 | async_schedule_domain(regulator_bulk_enable_async, | |
3567 | &consumers[i], &async_domain); | |
3568 | } | |
f21e0e81 MB |
3569 | |
3570 | async_synchronize_full_domain(&async_domain); | |
3571 | ||
3572 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3573 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3574 | if (consumers[i].ret != 0) { |
3575 | ret = consumers[i].ret; | |
414c70cb | 3576 | goto err; |
f21e0e81 | 3577 | } |
414c70cb LG |
3578 | } |
3579 | ||
3580 | return 0; | |
3581 | ||
3582 | err: | |
fbe31057 AH |
3583 | for (i = 0; i < num_consumers; i++) { |
3584 | if (consumers[i].ret < 0) | |
3585 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3586 | consumers[i].ret); | |
3587 | else | |
3588 | regulator_disable(consumers[i].consumer); | |
3589 | } | |
414c70cb LG |
3590 | |
3591 | return ret; | |
3592 | } | |
3593 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3594 | ||
3595 | /** | |
3596 | * regulator_bulk_disable - disable multiple regulator consumers | |
3597 | * | |
3598 | * @num_consumers: Number of consumers | |
3599 | * @consumers: Consumer data; clients are stored here. | |
3600 | * @return 0 on success, an errno on failure | |
3601 | * | |
3602 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3603 | * clients in a single API call. If any consumers cannot be disabled |
3604 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3605 | * return. |
3606 | */ | |
3607 | int regulator_bulk_disable(int num_consumers, | |
3608 | struct regulator_bulk_data *consumers) | |
3609 | { | |
3610 | int i; | |
01e86f49 | 3611 | int ret, r; |
414c70cb | 3612 | |
49e22632 | 3613 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3614 | ret = regulator_disable(consumers[i].consumer); |
3615 | if (ret != 0) | |
3616 | goto err; | |
3617 | } | |
3618 | ||
3619 | return 0; | |
3620 | ||
3621 | err: | |
5da84fd9 | 3622 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3623 | for (++i; i < num_consumers; ++i) { |
3624 | r = regulator_enable(consumers[i].consumer); | |
3625 | if (r != 0) | |
3626 | pr_err("Failed to reename %s: %d\n", | |
3627 | consumers[i].supply, r); | |
3628 | } | |
414c70cb LG |
3629 | |
3630 | return ret; | |
3631 | } | |
3632 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3633 | ||
e1de2f42 DK |
3634 | /** |
3635 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3636 | * | |
3637 | * @num_consumers: Number of consumers | |
3638 | * @consumers: Consumer data; clients are stored here. | |
3639 | * @return 0 on success, an errno on failure | |
3640 | * | |
3641 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3642 | * clients in a single API call. | |
3643 | * NOTE: This should be used for situations when device damage will | |
3644 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3645 | * Although regulator_force_disable function call for some consumers can | |
3646 | * return error numbers, the function is called for all consumers. | |
3647 | */ | |
3648 | int regulator_bulk_force_disable(int num_consumers, | |
3649 | struct regulator_bulk_data *consumers) | |
3650 | { | |
3651 | int i; | |
3652 | int ret; | |
3653 | ||
3654 | for (i = 0; i < num_consumers; i++) | |
3655 | consumers[i].ret = | |
3656 | regulator_force_disable(consumers[i].consumer); | |
3657 | ||
3658 | for (i = 0; i < num_consumers; i++) { | |
3659 | if (consumers[i].ret != 0) { | |
3660 | ret = consumers[i].ret; | |
3661 | goto out; | |
3662 | } | |
3663 | } | |
3664 | ||
3665 | return 0; | |
3666 | out: | |
3667 | return ret; | |
3668 | } | |
3669 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3670 | ||
414c70cb LG |
3671 | /** |
3672 | * regulator_bulk_free - free multiple regulator consumers | |
3673 | * | |
3674 | * @num_consumers: Number of consumers | |
3675 | * @consumers: Consumer data; clients are stored here. | |
3676 | * | |
3677 | * This convenience API allows consumers to free multiple regulator | |
3678 | * clients in a single API call. | |
3679 | */ | |
3680 | void regulator_bulk_free(int num_consumers, | |
3681 | struct regulator_bulk_data *consumers) | |
3682 | { | |
3683 | int i; | |
3684 | ||
3685 | for (i = 0; i < num_consumers; i++) { | |
3686 | regulator_put(consumers[i].consumer); | |
3687 | consumers[i].consumer = NULL; | |
3688 | } | |
3689 | } | |
3690 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3691 | ||
3692 | /** | |
3693 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3694 | * @rdev: regulator source |
414c70cb | 3695 | * @event: notifier block |
69279fb9 | 3696 | * @data: callback-specific data. |
414c70cb LG |
3697 | * |
3698 | * Called by regulator drivers to notify clients a regulator event has | |
3699 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3700 | * Note lock must be held by caller. |
414c70cb LG |
3701 | */ |
3702 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3703 | unsigned long event, void *data) | |
3704 | { | |
70cfef26 KK |
3705 | lockdep_assert_held_once(&rdev->mutex); |
3706 | ||
414c70cb LG |
3707 | _notifier_call_chain(rdev, event, data); |
3708 | return NOTIFY_DONE; | |
3709 | ||
3710 | } | |
3711 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3712 | ||
be721979 MB |
3713 | /** |
3714 | * regulator_mode_to_status - convert a regulator mode into a status | |
3715 | * | |
3716 | * @mode: Mode to convert | |
3717 | * | |
3718 | * Convert a regulator mode into a status. | |
3719 | */ | |
3720 | int regulator_mode_to_status(unsigned int mode) | |
3721 | { | |
3722 | switch (mode) { | |
3723 | case REGULATOR_MODE_FAST: | |
3724 | return REGULATOR_STATUS_FAST; | |
3725 | case REGULATOR_MODE_NORMAL: | |
3726 | return REGULATOR_STATUS_NORMAL; | |
3727 | case REGULATOR_MODE_IDLE: | |
3728 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3729 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3730 | return REGULATOR_STATUS_STANDBY; |
3731 | default: | |
1beaf762 | 3732 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3733 | } |
3734 | } | |
3735 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3736 | ||
39f802d6 TI |
3737 | static struct attribute *regulator_dev_attrs[] = { |
3738 | &dev_attr_name.attr, | |
3739 | &dev_attr_num_users.attr, | |
3740 | &dev_attr_type.attr, | |
3741 | &dev_attr_microvolts.attr, | |
3742 | &dev_attr_microamps.attr, | |
3743 | &dev_attr_opmode.attr, | |
3744 | &dev_attr_state.attr, | |
3745 | &dev_attr_status.attr, | |
3746 | &dev_attr_bypass.attr, | |
3747 | &dev_attr_requested_microamps.attr, | |
3748 | &dev_attr_min_microvolts.attr, | |
3749 | &dev_attr_max_microvolts.attr, | |
3750 | &dev_attr_min_microamps.attr, | |
3751 | &dev_attr_max_microamps.attr, | |
3752 | &dev_attr_suspend_standby_state.attr, | |
3753 | &dev_attr_suspend_mem_state.attr, | |
3754 | &dev_attr_suspend_disk_state.attr, | |
3755 | &dev_attr_suspend_standby_microvolts.attr, | |
3756 | &dev_attr_suspend_mem_microvolts.attr, | |
3757 | &dev_attr_suspend_disk_microvolts.attr, | |
3758 | &dev_attr_suspend_standby_mode.attr, | |
3759 | &dev_attr_suspend_mem_mode.attr, | |
3760 | &dev_attr_suspend_disk_mode.attr, | |
3761 | NULL | |
3762 | }; | |
3763 | ||
7ad68e2f DB |
3764 | /* |
3765 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3766 | * create attributes that can be meaningfully displayed. | |
3767 | */ | |
39f802d6 TI |
3768 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3769 | struct attribute *attr, int idx) | |
7ad68e2f | 3770 | { |
39f802d6 | 3771 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 3772 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 3773 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3774 | umode_t mode = attr->mode; |
3775 | ||
3776 | /* these three are always present */ | |
3777 | if (attr == &dev_attr_name.attr || | |
3778 | attr == &dev_attr_num_users.attr || | |
3779 | attr == &dev_attr_type.attr) | |
3780 | return mode; | |
7ad68e2f DB |
3781 | |
3782 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3783 | if (attr == &dev_attr_microvolts.attr) { |
3784 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3785 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3786 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3787 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3788 | return mode; | |
3789 | return 0; | |
f59c8f9f | 3790 | } |
7ad68e2f | 3791 | |
39f802d6 TI |
3792 | if (attr == &dev_attr_microamps.attr) |
3793 | return ops->get_current_limit ? mode : 0; | |
3794 | ||
3795 | if (attr == &dev_attr_opmode.attr) | |
3796 | return ops->get_mode ? mode : 0; | |
3797 | ||
3798 | if (attr == &dev_attr_state.attr) | |
3799 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3800 | ||
3801 | if (attr == &dev_attr_status.attr) | |
3802 | return ops->get_status ? mode : 0; | |
3803 | ||
3804 | if (attr == &dev_attr_bypass.attr) | |
3805 | return ops->get_bypass ? mode : 0; | |
3806 | ||
7ad68e2f | 3807 | /* some attributes are type-specific */ |
39f802d6 TI |
3808 | if (attr == &dev_attr_requested_microamps.attr) |
3809 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3810 | |
7ad68e2f | 3811 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3812 | if (attr == &dev_attr_min_microvolts.attr || |
3813 | attr == &dev_attr_max_microvolts.attr) | |
3814 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3815 | ||
3816 | if (attr == &dev_attr_min_microamps.attr || | |
3817 | attr == &dev_attr_max_microamps.attr) | |
3818 | return ops->set_current_limit ? mode : 0; | |
3819 | ||
3820 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3821 | attr == &dev_attr_suspend_mem_state.attr || | |
3822 | attr == &dev_attr_suspend_disk_state.attr) | |
3823 | return mode; | |
3824 | ||
3825 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3826 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3827 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3828 | return ops->set_suspend_voltage ? mode : 0; | |
3829 | ||
3830 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
3831 | attr == &dev_attr_suspend_mem_mode.attr || | |
3832 | attr == &dev_attr_suspend_disk_mode.attr) | |
3833 | return ops->set_suspend_mode ? mode : 0; | |
3834 | ||
3835 | return mode; | |
3836 | } | |
3837 | ||
3838 | static const struct attribute_group regulator_dev_group = { | |
3839 | .attrs = regulator_dev_attrs, | |
3840 | .is_visible = regulator_attr_is_visible, | |
3841 | }; | |
3842 | ||
3843 | static const struct attribute_group *regulator_dev_groups[] = { | |
3844 | ®ulator_dev_group, | |
3845 | NULL | |
3846 | }; | |
7ad68e2f | 3847 | |
39f802d6 TI |
3848 | static void regulator_dev_release(struct device *dev) |
3849 | { | |
3850 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
3851 | |
3852 | kfree(rdev->constraints); | |
3853 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 3854 | kfree(rdev); |
7ad68e2f DB |
3855 | } |
3856 | ||
39f802d6 TI |
3857 | static struct class regulator_class = { |
3858 | .name = "regulator", | |
3859 | .dev_release = regulator_dev_release, | |
3860 | .dev_groups = regulator_dev_groups, | |
3861 | }; | |
3862 | ||
1130e5b3 MB |
3863 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3864 | { | |
a9eaa813 GR |
3865 | struct device *parent = rdev->dev.parent; |
3866 | const char *rname = rdev_get_name(rdev); | |
3867 | char name[NAME_MAX]; | |
3868 | ||
3869 | /* Avoid duplicate debugfs directory names */ | |
3870 | if (parent && rname == rdev->desc->name) { | |
3871 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
3872 | rname); | |
3873 | rname = name; | |
3874 | } | |
3875 | ||
3876 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 3877 | if (!rdev->debugfs) { |
1130e5b3 | 3878 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3879 | return; |
3880 | } | |
3881 | ||
3882 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3883 | &rdev->use_count); | |
3884 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3885 | &rdev->open_count); | |
f59c8f9f MB |
3886 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3887 | &rdev->bypass_count); | |
1130e5b3 MB |
3888 | } |
3889 | ||
5e3ca2b3 JMC |
3890 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
3891 | { | |
7ddede6a JH |
3892 | struct regulator_dev *rdev = dev_to_rdev(dev); |
3893 | ||
3894 | if (regulator_resolve_supply(rdev)) | |
3895 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
3896 | ||
3897 | return 0; | |
5e3ca2b3 JMC |
3898 | } |
3899 | ||
414c70cb LG |
3900 | /** |
3901 | * regulator_register - register regulator | |
69279fb9 | 3902 | * @regulator_desc: regulator to register |
f47531b1 | 3903 | * @cfg: runtime configuration for regulator |
414c70cb LG |
3904 | * |
3905 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3906 | * Returns a valid pointer to struct regulator_dev on success |
3907 | * or an ERR_PTR() on error. | |
414c70cb | 3908 | */ |
65f26846 MB |
3909 | struct regulator_dev * |
3910 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 3911 | const struct regulator_config *cfg) |
414c70cb | 3912 | { |
9a8f5e07 | 3913 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3914 | const struct regulator_init_data *init_data; |
1b3de223 | 3915 | struct regulator_config *config = NULL; |
72dca06f | 3916 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 3917 | struct regulator_dev *rdev; |
32c8fad4 | 3918 | struct device *dev; |
a5766f11 | 3919 | int ret, i; |
414c70cb | 3920 | |
1b3de223 | 3921 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
3922 | return ERR_PTR(-EINVAL); |
3923 | ||
1b3de223 | 3924 | dev = cfg->dev; |
dcf70112 | 3925 | WARN_ON(!dev); |
32c8fad4 | 3926 | |
414c70cb LG |
3927 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3928 | return ERR_PTR(-EINVAL); | |
3929 | ||
cd78dfc6 DL |
3930 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3931 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3932 | return ERR_PTR(-EINVAL); |
3933 | ||
476c2d83 MB |
3934 | /* Only one of each should be implemented */ |
3935 | WARN_ON(regulator_desc->ops->get_voltage && | |
3936 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3937 | WARN_ON(regulator_desc->ops->set_voltage && |
3938 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3939 | |
3940 | /* If we're using selectors we must implement list_voltage. */ | |
3941 | if (regulator_desc->ops->get_voltage_sel && | |
3942 | !regulator_desc->ops->list_voltage) { | |
3943 | return ERR_PTR(-EINVAL); | |
3944 | } | |
e8eef82b MB |
3945 | if (regulator_desc->ops->set_voltage_sel && |
3946 | !regulator_desc->ops->list_voltage) { | |
3947 | return ERR_PTR(-EINVAL); | |
3948 | } | |
476c2d83 | 3949 | |
414c70cb LG |
3950 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3951 | if (rdev == NULL) | |
3952 | return ERR_PTR(-ENOMEM); | |
3953 | ||
1b3de223 KK |
3954 | /* |
3955 | * Duplicate the config so the driver could override it after | |
3956 | * parsing init data. | |
3957 | */ | |
3958 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
3959 | if (config == NULL) { | |
3960 | kfree(rdev); | |
3961 | return ERR_PTR(-ENOMEM); | |
3962 | } | |
3963 | ||
bfa21a0d | 3964 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
3965 | &rdev->dev.of_node); |
3966 | if (!init_data) { | |
3967 | init_data = config->init_data; | |
3968 | rdev->dev.of_node = of_node_get(config->of_node); | |
3969 | } | |
3970 | ||
414c70cb | 3971 | mutex_init(&rdev->mutex); |
c172708d | 3972 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3973 | rdev->owner = regulator_desc->owner; |
3974 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3975 | if (config->regmap) |
3976 | rdev->regmap = config->regmap; | |
52b84dac | 3977 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3978 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3979 | else if (dev->parent) |
3980 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3981 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3982 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3983 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3984 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3985 | |
a5766f11 | 3986 | /* preform any regulator specific init */ |
9a8f5e07 | 3987 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3988 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3989 | if (ret < 0) |
3990 | goto clean; | |
a5766f11 LG |
3991 | } |
3992 | ||
daad134d KA |
3993 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
3994 | gpio_is_valid(config->ena_gpio)) { | |
45389c47 | 3995 | mutex_lock(®ulator_list_mutex); |
daad134d | 3996 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 3997 | mutex_unlock(®ulator_list_mutex); |
daad134d KA |
3998 | if (ret != 0) { |
3999 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
4000 | config->ena_gpio, ret); | |
32165230 | 4001 | goto clean; |
daad134d KA |
4002 | } |
4003 | } | |
4004 | ||
a5766f11 | 4005 | /* register with sysfs */ |
414c70cb | 4006 | rdev->dev.class = ®ulator_class; |
a5766f11 | 4007 | rdev->dev.parent = dev; |
72dca06f | 4008 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 4009 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 4010 | |
74f544c1 | 4011 | /* set regulator constraints */ |
9a8f5e07 MB |
4012 | if (init_data) |
4013 | constraints = &init_data->constraints; | |
4014 | ||
9a8f5e07 | 4015 | if (init_data && init_data->supply_regulator) |
6261b06d | 4016 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 4017 | else if (regulator_desc->supply_name) |
6261b06d | 4018 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 4019 | |
45389c47 JH |
4020 | /* |
4021 | * Attempt to resolve the regulator supply, if specified, | |
4022 | * but don't return an error if we fail because we will try | |
4023 | * to resolve it again later as more regulators are added. | |
4024 | */ | |
4025 | if (regulator_resolve_supply(rdev)) | |
4026 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4027 | ||
4028 | ret = set_machine_constraints(rdev, constraints); | |
4029 | if (ret < 0) | |
4030 | goto wash; | |
4031 | ||
a5766f11 | 4032 | /* add consumers devices */ |
9a8f5e07 | 4033 | if (init_data) { |
45389c47 | 4034 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
4035 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
4036 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 4037 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 4038 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 4039 | if (ret < 0) { |
45389c47 | 4040 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
4041 | dev_err(dev, "Failed to set supply %s\n", |
4042 | init_data->consumer_supplies[i].supply); | |
4043 | goto unset_supplies; | |
4044 | } | |
23c2f041 | 4045 | } |
45389c47 | 4046 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 4047 | } |
a5766f11 | 4048 | |
c438b9d0 JH |
4049 | ret = device_register(&rdev->dev); |
4050 | if (ret != 0) { | |
4051 | put_device(&rdev->dev); | |
4052 | goto unset_supplies; | |
4053 | } | |
4054 | ||
4055 | dev_set_drvdata(&rdev->dev, rdev); | |
1130e5b3 | 4056 | rdev_init_debugfs(rdev); |
5e3ca2b3 JMC |
4057 | |
4058 | /* try to resolve regulators supply since a new one was registered */ | |
4059 | class_for_each_device(®ulator_class, NULL, NULL, | |
4060 | regulator_register_resolve_supply); | |
1b3de223 | 4061 | kfree(config); |
414c70cb | 4062 | return rdev; |
4fca9545 | 4063 | |
d4033b54 | 4064 | unset_supplies: |
45389c47 | 4065 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 4066 | unset_regulator_supplies(rdev); |
45389c47 | 4067 | mutex_unlock(®ulator_list_mutex); |
32165230 | 4068 | wash: |
469b640e | 4069 | kfree(rdev->constraints); |
45389c47 | 4070 | mutex_lock(®ulator_list_mutex); |
32165230 | 4071 | regulator_ena_gpio_free(rdev); |
45389c47 | 4072 | mutex_unlock(®ulator_list_mutex); |
4fca9545 DB |
4073 | clean: |
4074 | kfree(rdev); | |
a2151374 JH |
4075 | kfree(config); |
4076 | return ERR_PTR(ret); | |
414c70cb LG |
4077 | } |
4078 | EXPORT_SYMBOL_GPL(regulator_register); | |
4079 | ||
4080 | /** | |
4081 | * regulator_unregister - unregister regulator | |
69279fb9 | 4082 | * @rdev: regulator to unregister |
414c70cb LG |
4083 | * |
4084 | * Called by regulator drivers to unregister a regulator. | |
4085 | */ | |
4086 | void regulator_unregister(struct regulator_dev *rdev) | |
4087 | { | |
4088 | if (rdev == NULL) | |
4089 | return; | |
4090 | ||
891636ea MB |
4091 | if (rdev->supply) { |
4092 | while (rdev->use_count--) | |
4093 | regulator_disable(rdev->supply); | |
e032b376 | 4094 | regulator_put(rdev->supply); |
891636ea | 4095 | } |
414c70cb | 4096 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 4097 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 4098 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 4099 | WARN_ON(rdev->open_count); |
0f1d747b | 4100 | unset_regulator_supplies(rdev); |
414c70cb | 4101 | list_del(&rdev->list); |
f19b00da | 4102 | regulator_ena_gpio_free(rdev); |
2c0a303a | 4103 | mutex_unlock(®ulator_list_mutex); |
58fb5cf5 | 4104 | device_unregister(&rdev->dev); |
414c70cb LG |
4105 | } |
4106 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
4107 | ||
85f3b431 TV |
4108 | static int _regulator_suspend_prepare(struct device *dev, void *data) |
4109 | { | |
4110 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4111 | const suspend_state_t *state = data; | |
4112 | int ret; | |
4113 | ||
4114 | mutex_lock(&rdev->mutex); | |
4115 | ret = suspend_prepare(rdev, *state); | |
4116 | mutex_unlock(&rdev->mutex); | |
4117 | ||
4118 | return ret; | |
4119 | } | |
4120 | ||
414c70cb | 4121 | /** |
cf7bbcdf | 4122 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
4123 | * @state: system suspend state |
4124 | * | |
4125 | * Configure each regulator with it's suspend operating parameters for state. | |
4126 | * This will usually be called by machine suspend code prior to supending. | |
4127 | */ | |
4128 | int regulator_suspend_prepare(suspend_state_t state) | |
4129 | { | |
414c70cb LG |
4130 | /* ON is handled by regulator active state */ |
4131 | if (state == PM_SUSPEND_ON) | |
4132 | return -EINVAL; | |
4133 | ||
85f3b431 TV |
4134 | return class_for_each_device(®ulator_class, NULL, &state, |
4135 | _regulator_suspend_prepare); | |
4136 | } | |
4137 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
414c70cb | 4138 | |
85f3b431 TV |
4139 | static int _regulator_suspend_finish(struct device *dev, void *data) |
4140 | { | |
4141 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4142 | int ret; | |
414c70cb | 4143 | |
85f3b431 TV |
4144 | mutex_lock(&rdev->mutex); |
4145 | if (rdev->use_count > 0 || rdev->constraints->always_on) { | |
4146 | if (!_regulator_is_enabled(rdev)) { | |
4147 | ret = _regulator_do_enable(rdev); | |
4148 | if (ret) | |
4149 | dev_err(dev, | |
4150 | "Failed to resume regulator %d\n", | |
4151 | ret); | |
414c70cb | 4152 | } |
85f3b431 TV |
4153 | } else { |
4154 | if (!have_full_constraints()) | |
4155 | goto unlock; | |
4156 | if (!_regulator_is_enabled(rdev)) | |
4157 | goto unlock; | |
4158 | ||
4159 | ret = _regulator_do_disable(rdev); | |
4160 | if (ret) | |
4161 | dev_err(dev, "Failed to suspend regulator %d\n", ret); | |
414c70cb | 4162 | } |
85f3b431 TV |
4163 | unlock: |
4164 | mutex_unlock(&rdev->mutex); | |
4165 | ||
4166 | /* Keep processing regulators in spite of any errors */ | |
4167 | return 0; | |
414c70cb | 4168 | } |
414c70cb | 4169 | |
7a32b589 MH |
4170 | /** |
4171 | * regulator_suspend_finish - resume regulators from system wide suspend | |
4172 | * | |
4173 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
4174 | * and that should be turned on according to the regulators properties. | |
4175 | */ | |
4176 | int regulator_suspend_finish(void) | |
4177 | { | |
85f3b431 TV |
4178 | return class_for_each_device(®ulator_class, NULL, NULL, |
4179 | _regulator_suspend_finish); | |
7a32b589 MH |
4180 | } |
4181 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
4182 | ||
ca725561 MB |
4183 | /** |
4184 | * regulator_has_full_constraints - the system has fully specified constraints | |
4185 | * | |
4186 | * Calling this function will cause the regulator API to disable all | |
4187 | * regulators which have a zero use count and don't have an always_on | |
4188 | * constraint in a late_initcall. | |
4189 | * | |
4190 | * The intention is that this will become the default behaviour in a | |
4191 | * future kernel release so users are encouraged to use this facility | |
4192 | * now. | |
4193 | */ | |
4194 | void regulator_has_full_constraints(void) | |
4195 | { | |
4196 | has_full_constraints = 1; | |
4197 | } | |
4198 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
4199 | ||
414c70cb LG |
4200 | /** |
4201 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 4202 | * @rdev: regulator |
414c70cb LG |
4203 | * |
4204 | * Get rdev regulator driver private data. This call can be used in the | |
4205 | * regulator driver context. | |
4206 | */ | |
4207 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
4208 | { | |
4209 | return rdev->reg_data; | |
4210 | } | |
4211 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
4212 | ||
4213 | /** | |
4214 | * regulator_get_drvdata - get regulator driver data | |
4215 | * @regulator: regulator | |
4216 | * | |
4217 | * Get regulator driver private data. This call can be used in the consumer | |
4218 | * driver context when non API regulator specific functions need to be called. | |
4219 | */ | |
4220 | void *regulator_get_drvdata(struct regulator *regulator) | |
4221 | { | |
4222 | return regulator->rdev->reg_data; | |
4223 | } | |
4224 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
4225 | ||
4226 | /** | |
4227 | * regulator_set_drvdata - set regulator driver data | |
4228 | * @regulator: regulator | |
4229 | * @data: data | |
4230 | */ | |
4231 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
4232 | { | |
4233 | regulator->rdev->reg_data = data; | |
4234 | } | |
4235 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
4236 | ||
4237 | /** | |
4238 | * regulator_get_id - get regulator ID | |
69279fb9 | 4239 | * @rdev: regulator |
414c70cb LG |
4240 | */ |
4241 | int rdev_get_id(struct regulator_dev *rdev) | |
4242 | { | |
4243 | return rdev->desc->id; | |
4244 | } | |
4245 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
4246 | ||
a5766f11 LG |
4247 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
4248 | { | |
4249 | return &rdev->dev; | |
4250 | } | |
4251 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
4252 | ||
4253 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
4254 | { | |
4255 | return reg_init_data->driver_data; | |
4256 | } | |
4257 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
4258 | ||
ba55a974 MB |
4259 | #ifdef CONFIG_DEBUG_FS |
4260 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
4261 | size_t count, loff_t *ppos) | |
4262 | { | |
4263 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
4264 | ssize_t len, ret = 0; | |
4265 | struct regulator_map *map; | |
4266 | ||
4267 | if (!buf) | |
4268 | return -ENOMEM; | |
4269 | ||
4270 | list_for_each_entry(map, ®ulator_map_list, list) { | |
4271 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
4272 | "%s -> %s.%s\n", | |
4273 | rdev_get_name(map->regulator), map->dev_name, | |
4274 | map->supply); | |
4275 | if (len >= 0) | |
4276 | ret += len; | |
4277 | if (ret > PAGE_SIZE) { | |
4278 | ret = PAGE_SIZE; | |
4279 | break; | |
4280 | } | |
4281 | } | |
4282 | ||
4283 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
4284 | ||
4285 | kfree(buf); | |
4286 | ||
4287 | return ret; | |
4288 | } | |
24751434 | 4289 | #endif |
ba55a974 MB |
4290 | |
4291 | static const struct file_operations supply_map_fops = { | |
24751434 | 4292 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
4293 | .read = supply_map_read_file, |
4294 | .llseek = default_llseek, | |
ba55a974 | 4295 | #endif |
24751434 | 4296 | }; |
ba55a974 | 4297 | |
7c225ec9 | 4298 | #ifdef CONFIG_DEBUG_FS |
85f3b431 TV |
4299 | struct summary_data { |
4300 | struct seq_file *s; | |
4301 | struct regulator_dev *parent; | |
4302 | int level; | |
4303 | }; | |
4304 | ||
4305 | static void regulator_summary_show_subtree(struct seq_file *s, | |
4306 | struct regulator_dev *rdev, | |
4307 | int level); | |
4308 | ||
4309 | static int regulator_summary_show_children(struct device *dev, void *data) | |
4310 | { | |
4311 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4312 | struct summary_data *summary_data = data; | |
4313 | ||
4314 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
4315 | regulator_summary_show_subtree(summary_data->s, rdev, | |
4316 | summary_data->level + 1); | |
4317 | ||
4318 | return 0; | |
4319 | } | |
4320 | ||
7c225ec9 HS |
4321 | static void regulator_summary_show_subtree(struct seq_file *s, |
4322 | struct regulator_dev *rdev, | |
4323 | int level) | |
4324 | { | |
7c225ec9 HS |
4325 | struct regulation_constraints *c; |
4326 | struct regulator *consumer; | |
85f3b431 | 4327 | struct summary_data summary_data; |
7c225ec9 HS |
4328 | |
4329 | if (!rdev) | |
4330 | return; | |
4331 | ||
7c225ec9 HS |
4332 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
4333 | level * 3 + 1, "", | |
4334 | 30 - level * 3, rdev_get_name(rdev), | |
4335 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
4336 | ||
23296099 HS |
4337 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
4338 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
4339 | |
4340 | c = rdev->constraints; | |
4341 | if (c) { | |
4342 | switch (rdev->desc->type) { | |
4343 | case REGULATOR_VOLTAGE: | |
4344 | seq_printf(s, "%5dmV %5dmV ", | |
4345 | c->min_uV / 1000, c->max_uV / 1000); | |
4346 | break; | |
4347 | case REGULATOR_CURRENT: | |
4348 | seq_printf(s, "%5dmA %5dmA ", | |
4349 | c->min_uA / 1000, c->max_uA / 1000); | |
4350 | break; | |
4351 | } | |
4352 | } | |
4353 | ||
4354 | seq_puts(s, "\n"); | |
4355 | ||
4356 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
4357 | if (consumer->dev->class == ®ulator_class) | |
4358 | continue; | |
4359 | ||
4360 | seq_printf(s, "%*s%-*s ", | |
4361 | (level + 1) * 3 + 1, "", | |
4362 | 30 - (level + 1) * 3, dev_name(consumer->dev)); | |
4363 | ||
4364 | switch (rdev->desc->type) { | |
4365 | case REGULATOR_VOLTAGE: | |
23296099 | 4366 | seq_printf(s, "%37dmV %5dmV", |
7c225ec9 HS |
4367 | consumer->min_uV / 1000, |
4368 | consumer->max_uV / 1000); | |
4369 | break; | |
4370 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4371 | break; |
4372 | } | |
4373 | ||
4374 | seq_puts(s, "\n"); | |
4375 | } | |
4376 | ||
85f3b431 TV |
4377 | summary_data.s = s; |
4378 | summary_data.level = level; | |
4379 | summary_data.parent = rdev; | |
7c225ec9 | 4380 | |
85f3b431 TV |
4381 | class_for_each_device(®ulator_class, NULL, &summary_data, |
4382 | regulator_summary_show_children); | |
7c225ec9 HS |
4383 | } |
4384 | ||
85f3b431 | 4385 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 4386 | { |
85f3b431 TV |
4387 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4388 | struct seq_file *s = data; | |
7c225ec9 | 4389 | |
85f3b431 TV |
4390 | if (!rdev->supply) |
4391 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 4392 | |
85f3b431 TV |
4393 | return 0; |
4394 | } | |
7c225ec9 | 4395 | |
85f3b431 TV |
4396 | static int regulator_summary_show(struct seq_file *s, void *data) |
4397 | { | |
4398 | seq_puts(s, " regulator use open bypass voltage current min max\n"); | |
4399 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 | 4400 | |
85f3b431 TV |
4401 | class_for_each_device(®ulator_class, NULL, s, |
4402 | regulator_summary_show_roots); | |
7c225ec9 HS |
4403 | |
4404 | return 0; | |
4405 | } | |
4406 | ||
4407 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4408 | { | |
4409 | return single_open(file, regulator_summary_show, inode->i_private); | |
4410 | } | |
4411 | #endif | |
4412 | ||
4413 | static const struct file_operations regulator_summary_fops = { | |
4414 | #ifdef CONFIG_DEBUG_FS | |
4415 | .open = regulator_summary_open, | |
4416 | .read = seq_read, | |
4417 | .llseek = seq_lseek, | |
4418 | .release = single_release, | |
4419 | #endif | |
4420 | }; | |
4421 | ||
414c70cb LG |
4422 | static int __init regulator_init(void) |
4423 | { | |
34abbd68 MB |
4424 | int ret; |
4425 | ||
34abbd68 MB |
4426 | ret = class_register(®ulator_class); |
4427 | ||
1130e5b3 | 4428 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4429 | if (!debugfs_root) |
1130e5b3 | 4430 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4431 | |
f4d562c6 MB |
4432 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4433 | &supply_map_fops); | |
1130e5b3 | 4434 | |
7c225ec9 | 4435 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 4436 | NULL, ®ulator_summary_fops); |
7c225ec9 | 4437 | |
34abbd68 MB |
4438 | regulator_dummy_init(); |
4439 | ||
4440 | return ret; | |
414c70cb LG |
4441 | } |
4442 | ||
4443 | /* init early to allow our consumers to complete system booting */ | |
4444 | core_initcall(regulator_init); | |
ca725561 | 4445 | |
609ca5f3 | 4446 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 4447 | { |
609ca5f3 MB |
4448 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4449 | const struct regulator_ops *ops = rdev->desc->ops; | |
4450 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 4451 | int enabled, ret; |
ca725561 | 4452 | |
609ca5f3 MB |
4453 | if (c && c->always_on) |
4454 | return 0; | |
4455 | ||
8a34e979 | 4456 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
4457 | return 0; |
4458 | ||
4459 | mutex_lock(&rdev->mutex); | |
4460 | ||
4461 | if (rdev->use_count) | |
4462 | goto unlock; | |
4463 | ||
4464 | /* If we can't read the status assume it's on. */ | |
4465 | if (ops->is_enabled) | |
4466 | enabled = ops->is_enabled(rdev); | |
4467 | else | |
4468 | enabled = 1; | |
4469 | ||
4470 | if (!enabled) | |
4471 | goto unlock; | |
4472 | ||
4473 | if (have_full_constraints()) { | |
4474 | /* We log since this may kill the system if it goes | |
4475 | * wrong. */ | |
4476 | rdev_info(rdev, "disabling\n"); | |
4477 | ret = _regulator_do_disable(rdev); | |
4478 | if (ret != 0) | |
4479 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
4480 | } else { | |
4481 | /* The intention is that in future we will | |
4482 | * assume that full constraints are provided | |
4483 | * so warn even if we aren't going to do | |
4484 | * anything here. | |
4485 | */ | |
4486 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
4487 | } | |
4488 | ||
4489 | unlock: | |
4490 | mutex_unlock(&rdev->mutex); | |
4491 | ||
4492 | return 0; | |
4493 | } | |
4494 | ||
4495 | static int __init regulator_init_complete(void) | |
4496 | { | |
86f5fcfc MB |
4497 | /* |
4498 | * Since DT doesn't provide an idiomatic mechanism for | |
4499 | * enabling full constraints and since it's much more natural | |
4500 | * with DT to provide them just assume that a DT enabled | |
4501 | * system has full constraints. | |
4502 | */ | |
4503 | if (of_have_populated_dt()) | |
4504 | has_full_constraints = true; | |
4505 | ||
ca725561 | 4506 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
4507 | * we have permission to change the status for and which are |
4508 | * not in use or always_on. This is effectively the default | |
4509 | * for DT and ACPI as they have full constraints. | |
ca725561 | 4510 | */ |
609ca5f3 MB |
4511 | class_for_each_device(®ulator_class, NULL, NULL, |
4512 | regulator_late_cleanup); | |
ca725561 MB |
4513 | |
4514 | return 0; | |
4515 | } | |
fd482a3e | 4516 | late_initcall_sync(regulator_init_complete); |