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 | ||
70a7fb80 TR |
135 | static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev) |
136 | { | |
137 | if (rdev && rdev->supply) | |
138 | return rdev->supply->rdev; | |
139 | ||
140 | return NULL; | |
141 | } | |
142 | ||
9f01cd4a SH |
143 | /** |
144 | * regulator_lock_supply - lock a regulator and its supplies | |
145 | * @rdev: regulator source | |
146 | */ | |
147 | static void regulator_lock_supply(struct regulator_dev *rdev) | |
148 | { | |
fa731ac7 | 149 | int i; |
9f01cd4a | 150 | |
70a7fb80 | 151 | for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++) |
fa731ac7 | 152 | mutex_lock_nested(&rdev->mutex, i); |
9f01cd4a SH |
153 | } |
154 | ||
155 | /** | |
156 | * regulator_unlock_supply - unlock a regulator and its supplies | |
157 | * @rdev: regulator source | |
158 | */ | |
159 | static void regulator_unlock_supply(struct regulator_dev *rdev) | |
160 | { | |
161 | struct regulator *supply; | |
162 | ||
163 | while (1) { | |
164 | mutex_unlock(&rdev->mutex); | |
165 | supply = rdev->supply; | |
166 | ||
167 | if (!rdev->supply) | |
168 | return; | |
169 | ||
170 | rdev = supply->rdev; | |
171 | } | |
172 | } | |
173 | ||
69511a45 RN |
174 | /** |
175 | * of_get_regulator - get a regulator device node based on supply name | |
176 | * @dev: Device pointer for the consumer (of regulator) device | |
177 | * @supply: regulator supply name | |
178 | * | |
179 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 180 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
181 | * returns NULL. |
182 | */ | |
183 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
184 | { | |
185 | struct device_node *regnode = NULL; | |
186 | char prop_name[32]; /* 32 is max size of property name */ | |
187 | ||
188 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
189 | ||
190 | snprintf(prop_name, 32, "%s-supply", supply); | |
191 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
192 | ||
193 | if (!regnode) { | |
16fbcc3b | 194 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
195 | prop_name, dev->of_node->full_name); |
196 | return NULL; | |
197 | } | |
198 | return regnode; | |
199 | } | |
200 | ||
6492bc1b MB |
201 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
202 | { | |
203 | if (!rdev->constraints) | |
204 | return 0; | |
205 | ||
206 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
207 | return 1; | |
208 | else | |
209 | return 0; | |
210 | } | |
211 | ||
414c70cb LG |
212 | /* Platform voltage constraint check */ |
213 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
214 | int *min_uV, int *max_uV) | |
215 | { | |
216 | BUG_ON(*min_uV > *max_uV); | |
217 | ||
218 | if (!rdev->constraints) { | |
5da84fd9 | 219 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
220 | return -ENODEV; |
221 | } | |
222 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
7ebcf26c | 223 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
224 | return -EPERM; |
225 | } | |
226 | ||
227 | if (*max_uV > rdev->constraints->max_uV) | |
228 | *max_uV = rdev->constraints->max_uV; | |
229 | if (*min_uV < rdev->constraints->min_uV) | |
230 | *min_uV = rdev->constraints->min_uV; | |
231 | ||
89f425ed MB |
232 | if (*min_uV > *max_uV) { |
233 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 234 | *min_uV, *max_uV); |
414c70cb | 235 | return -EINVAL; |
89f425ed | 236 | } |
414c70cb LG |
237 | |
238 | return 0; | |
239 | } | |
240 | ||
05fda3b1 TP |
241 | /* Make sure we select a voltage that suits the needs of all |
242 | * regulator consumers | |
243 | */ | |
244 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
245 | int *min_uV, int *max_uV) | |
246 | { | |
247 | struct regulator *regulator; | |
248 | ||
249 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
250 | /* |
251 | * Assume consumers that didn't say anything are OK | |
252 | * with anything in the constraint range. | |
253 | */ | |
254 | if (!regulator->min_uV && !regulator->max_uV) | |
255 | continue; | |
256 | ||
05fda3b1 TP |
257 | if (*max_uV > regulator->max_uV) |
258 | *max_uV = regulator->max_uV; | |
259 | if (*min_uV < regulator->min_uV) | |
260 | *min_uV = regulator->min_uV; | |
261 | } | |
262 | ||
dd8004af | 263 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
264 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
265 | *min_uV, *max_uV); | |
05fda3b1 | 266 | return -EINVAL; |
dd8004af | 267 | } |
05fda3b1 TP |
268 | |
269 | return 0; | |
270 | } | |
271 | ||
414c70cb LG |
272 | /* current constraint check */ |
273 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
274 | int *min_uA, int *max_uA) | |
275 | { | |
276 | BUG_ON(*min_uA > *max_uA); | |
277 | ||
278 | if (!rdev->constraints) { | |
5da84fd9 | 279 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
280 | return -ENODEV; |
281 | } | |
282 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
7ebcf26c | 283 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
284 | return -EPERM; |
285 | } | |
286 | ||
287 | if (*max_uA > rdev->constraints->max_uA) | |
288 | *max_uA = rdev->constraints->max_uA; | |
289 | if (*min_uA < rdev->constraints->min_uA) | |
290 | *min_uA = rdev->constraints->min_uA; | |
291 | ||
89f425ed MB |
292 | if (*min_uA > *max_uA) { |
293 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 294 | *min_uA, *max_uA); |
414c70cb | 295 | return -EINVAL; |
89f425ed | 296 | } |
414c70cb LG |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
301 | /* operating mode constraint check */ | |
2c608234 | 302 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 303 | { |
2c608234 | 304 | switch (*mode) { |
e573520b DB |
305 | case REGULATOR_MODE_FAST: |
306 | case REGULATOR_MODE_NORMAL: | |
307 | case REGULATOR_MODE_IDLE: | |
308 | case REGULATOR_MODE_STANDBY: | |
309 | break; | |
310 | default: | |
89f425ed | 311 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
312 | return -EINVAL; |
313 | } | |
314 | ||
414c70cb | 315 | if (!rdev->constraints) { |
5da84fd9 | 316 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
317 | return -ENODEV; |
318 | } | |
319 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
7ebcf26c | 320 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
321 | return -EPERM; |
322 | } | |
2c608234 MB |
323 | |
324 | /* The modes are bitmasks, the most power hungry modes having | |
325 | * the lowest values. If the requested mode isn't supported | |
326 | * try higher modes. */ | |
327 | while (*mode) { | |
328 | if (rdev->constraints->valid_modes_mask & *mode) | |
329 | return 0; | |
330 | *mode /= 2; | |
414c70cb | 331 | } |
2c608234 MB |
332 | |
333 | return -EINVAL; | |
414c70cb LG |
334 | } |
335 | ||
336 | /* dynamic regulator mode switching constraint check */ | |
337 | static int regulator_check_drms(struct regulator_dev *rdev) | |
338 | { | |
339 | if (!rdev->constraints) { | |
5da84fd9 | 340 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
341 | return -ENODEV; |
342 | } | |
343 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
7ebcf26c | 344 | rdev_dbg(rdev, "drms operation not allowed\n"); |
414c70cb LG |
345 | return -EPERM; |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
414c70cb LG |
350 | static ssize_t regulator_uV_show(struct device *dev, |
351 | struct device_attribute *attr, char *buf) | |
352 | { | |
a5766f11 | 353 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
354 | ssize_t ret; |
355 | ||
356 | mutex_lock(&rdev->mutex); | |
357 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
358 | mutex_unlock(&rdev->mutex); | |
359 | ||
360 | return ret; | |
361 | } | |
7ad68e2f | 362 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
363 | |
364 | static ssize_t regulator_uA_show(struct device *dev, | |
365 | struct device_attribute *attr, char *buf) | |
366 | { | |
a5766f11 | 367 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
368 | |
369 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
370 | } | |
7ad68e2f | 371 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 372 | |
587cea27 GKH |
373 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
374 | char *buf) | |
bc558a60 MB |
375 | { |
376 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 377 | |
1083c393 | 378 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 379 | } |
587cea27 | 380 | static DEVICE_ATTR_RO(name); |
bc558a60 | 381 | |
4fca9545 | 382 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 383 | { |
414c70cb LG |
384 | switch (mode) { |
385 | case REGULATOR_MODE_FAST: | |
386 | return sprintf(buf, "fast\n"); | |
387 | case REGULATOR_MODE_NORMAL: | |
388 | return sprintf(buf, "normal\n"); | |
389 | case REGULATOR_MODE_IDLE: | |
390 | return sprintf(buf, "idle\n"); | |
391 | case REGULATOR_MODE_STANDBY: | |
392 | return sprintf(buf, "standby\n"); | |
393 | } | |
394 | return sprintf(buf, "unknown\n"); | |
395 | } | |
396 | ||
4fca9545 DB |
397 | static ssize_t regulator_opmode_show(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
414c70cb | 399 | { |
a5766f11 | 400 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 401 | |
4fca9545 DB |
402 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
403 | } | |
7ad68e2f | 404 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
405 | |
406 | static ssize_t regulator_print_state(char *buf, int state) | |
407 | { | |
414c70cb LG |
408 | if (state > 0) |
409 | return sprintf(buf, "enabled\n"); | |
410 | else if (state == 0) | |
411 | return sprintf(buf, "disabled\n"); | |
412 | else | |
413 | return sprintf(buf, "unknown\n"); | |
414 | } | |
415 | ||
4fca9545 DB |
416 | static ssize_t regulator_state_show(struct device *dev, |
417 | struct device_attribute *attr, char *buf) | |
418 | { | |
419 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
420 | ssize_t ret; |
421 | ||
422 | mutex_lock(&rdev->mutex); | |
423 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
424 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 425 | |
9332546f | 426 | return ret; |
4fca9545 | 427 | } |
7ad68e2f | 428 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 429 | |
853116a1 DB |
430 | static ssize_t regulator_status_show(struct device *dev, |
431 | struct device_attribute *attr, char *buf) | |
432 | { | |
433 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
434 | int status; | |
435 | char *label; | |
436 | ||
437 | status = rdev->desc->ops->get_status(rdev); | |
438 | if (status < 0) | |
439 | return status; | |
440 | ||
441 | switch (status) { | |
442 | case REGULATOR_STATUS_OFF: | |
443 | label = "off"; | |
444 | break; | |
445 | case REGULATOR_STATUS_ON: | |
446 | label = "on"; | |
447 | break; | |
448 | case REGULATOR_STATUS_ERROR: | |
449 | label = "error"; | |
450 | break; | |
451 | case REGULATOR_STATUS_FAST: | |
452 | label = "fast"; | |
453 | break; | |
454 | case REGULATOR_STATUS_NORMAL: | |
455 | label = "normal"; | |
456 | break; | |
457 | case REGULATOR_STATUS_IDLE: | |
458 | label = "idle"; | |
459 | break; | |
460 | case REGULATOR_STATUS_STANDBY: | |
461 | label = "standby"; | |
462 | break; | |
f59c8f9f MB |
463 | case REGULATOR_STATUS_BYPASS: |
464 | label = "bypass"; | |
465 | break; | |
1beaf762 KG |
466 | case REGULATOR_STATUS_UNDEFINED: |
467 | label = "undefined"; | |
468 | break; | |
853116a1 DB |
469 | default: |
470 | return -ERANGE; | |
471 | } | |
472 | ||
473 | return sprintf(buf, "%s\n", label); | |
474 | } | |
475 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
476 | ||
414c70cb LG |
477 | static ssize_t regulator_min_uA_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_uA); | |
486 | } | |
7ad68e2f | 487 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
488 | |
489 | static ssize_t regulator_max_uA_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_uA); | |
498 | } | |
7ad68e2f | 499 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
500 | |
501 | static ssize_t regulator_min_uV_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 | |
506 | if (!rdev->constraints) | |
507 | return sprintf(buf, "constraint not defined\n"); | |
508 | ||
509 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
510 | } | |
7ad68e2f | 511 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
512 | |
513 | static ssize_t regulator_max_uV_show(struct device *dev, | |
514 | struct device_attribute *attr, char *buf) | |
515 | { | |
a5766f11 | 516 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
517 | |
518 | if (!rdev->constraints) | |
519 | return sprintf(buf, "constraint not defined\n"); | |
520 | ||
521 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
522 | } | |
7ad68e2f | 523 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
524 | |
525 | static ssize_t regulator_total_uA_show(struct device *dev, | |
526 | struct device_attribute *attr, char *buf) | |
527 | { | |
a5766f11 | 528 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
529 | struct regulator *regulator; |
530 | int uA = 0; | |
531 | ||
532 | mutex_lock(&rdev->mutex); | |
533 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 534 | uA += regulator->uA_load; |
414c70cb LG |
535 | mutex_unlock(&rdev->mutex); |
536 | return sprintf(buf, "%d\n", uA); | |
537 | } | |
7ad68e2f | 538 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 539 | |
587cea27 GKH |
540 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
541 | char *buf) | |
414c70cb | 542 | { |
a5766f11 | 543 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
544 | return sprintf(buf, "%d\n", rdev->use_count); |
545 | } | |
587cea27 | 546 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 547 | |
587cea27 GKH |
548 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
549 | char *buf) | |
414c70cb | 550 | { |
a5766f11 | 551 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
552 | |
553 | switch (rdev->desc->type) { | |
554 | case REGULATOR_VOLTAGE: | |
555 | return sprintf(buf, "voltage\n"); | |
556 | case REGULATOR_CURRENT: | |
557 | return sprintf(buf, "current\n"); | |
558 | } | |
559 | return sprintf(buf, "unknown\n"); | |
560 | } | |
587cea27 | 561 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
562 | |
563 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
a5766f11 | 566 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 567 | |
414c70cb LG |
568 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
569 | } | |
7ad68e2f DB |
570 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
571 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
572 | |
573 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
574 | struct device_attribute *attr, char *buf) | |
575 | { | |
a5766f11 | 576 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 577 | |
414c70cb LG |
578 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
579 | } | |
7ad68e2f DB |
580 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
581 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
582 | |
583 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
584 | struct device_attribute *attr, char *buf) | |
585 | { | |
a5766f11 | 586 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 587 | |
414c70cb LG |
588 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
589 | } | |
7ad68e2f DB |
590 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
591 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 592 | |
414c70cb LG |
593 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
594 | struct device_attribute *attr, char *buf) | |
595 | { | |
a5766f11 | 596 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 597 | |
4fca9545 DB |
598 | return regulator_print_opmode(buf, |
599 | rdev->constraints->state_mem.mode); | |
414c70cb | 600 | } |
7ad68e2f DB |
601 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
602 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
603 | |
604 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
605 | struct device_attribute *attr, char *buf) | |
606 | { | |
a5766f11 | 607 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 608 | |
4fca9545 DB |
609 | return regulator_print_opmode(buf, |
610 | rdev->constraints->state_disk.mode); | |
414c70cb | 611 | } |
7ad68e2f DB |
612 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
613 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
614 | |
615 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
616 | struct device_attribute *attr, char *buf) | |
617 | { | |
a5766f11 | 618 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 619 | |
4fca9545 DB |
620 | return regulator_print_opmode(buf, |
621 | rdev->constraints->state_standby.mode); | |
414c70cb | 622 | } |
7ad68e2f DB |
623 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
624 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
625 | |
626 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
627 | struct device_attribute *attr, char *buf) | |
628 | { | |
a5766f11 | 629 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 630 | |
4fca9545 DB |
631 | return regulator_print_state(buf, |
632 | rdev->constraints->state_mem.enabled); | |
414c70cb | 633 | } |
7ad68e2f DB |
634 | static DEVICE_ATTR(suspend_mem_state, 0444, |
635 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
636 | |
637 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
638 | struct device_attribute *attr, char *buf) | |
639 | { | |
a5766f11 | 640 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 641 | |
4fca9545 DB |
642 | return regulator_print_state(buf, |
643 | rdev->constraints->state_disk.enabled); | |
414c70cb | 644 | } |
7ad68e2f DB |
645 | static DEVICE_ATTR(suspend_disk_state, 0444, |
646 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
647 | |
648 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
649 | struct device_attribute *attr, char *buf) | |
650 | { | |
a5766f11 | 651 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 652 | |
4fca9545 DB |
653 | return regulator_print_state(buf, |
654 | rdev->constraints->state_standby.enabled); | |
414c70cb | 655 | } |
7ad68e2f DB |
656 | static DEVICE_ATTR(suspend_standby_state, 0444, |
657 | regulator_suspend_standby_state_show, NULL); | |
658 | ||
f59c8f9f MB |
659 | static ssize_t regulator_bypass_show(struct device *dev, |
660 | struct device_attribute *attr, char *buf) | |
661 | { | |
662 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
663 | const char *report; | |
664 | bool bypass; | |
665 | int ret; | |
666 | ||
667 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
668 | ||
669 | if (ret != 0) | |
670 | report = "unknown"; | |
671 | else if (bypass) | |
672 | report = "enabled"; | |
673 | else | |
674 | report = "disabled"; | |
675 | ||
676 | return sprintf(buf, "%s\n", report); | |
677 | } | |
678 | static DEVICE_ATTR(bypass, 0444, | |
679 | regulator_bypass_show, NULL); | |
bc558a60 | 680 | |
414c70cb LG |
681 | /* Calculate the new optimum regulator operating mode based on the new total |
682 | * consumer load. All locks held by caller */ | |
8460ef38 | 683 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
684 | { |
685 | struct regulator *sibling; | |
686 | int current_uA = 0, output_uV, input_uV, err; | |
687 | unsigned int mode; | |
688 | ||
70cfef26 KK |
689 | lockdep_assert_held_once(&rdev->mutex); |
690 | ||
8460ef38 BA |
691 | /* |
692 | * first check to see if we can set modes at all, otherwise just | |
693 | * tell the consumer everything is OK. | |
694 | */ | |
414c70cb | 695 | err = regulator_check_drms(rdev); |
8460ef38 BA |
696 | if (err < 0) |
697 | return 0; | |
698 | ||
8f4490e0 BA |
699 | if (!rdev->desc->ops->get_optimum_mode && |
700 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
701 | return 0; |
702 | ||
8f4490e0 BA |
703 | if (!rdev->desc->ops->set_mode && |
704 | !rdev->desc->ops->set_load) | |
8460ef38 | 705 | return -EINVAL; |
414c70cb LG |
706 | |
707 | /* get output voltage */ | |
1bf5a1f8 | 708 | output_uV = _regulator_get_voltage(rdev); |
8460ef38 BA |
709 | if (output_uV <= 0) { |
710 | rdev_err(rdev, "invalid output voltage found\n"); | |
711 | return -EINVAL; | |
712 | } | |
414c70cb LG |
713 | |
714 | /* get input voltage */ | |
1bf5a1f8 MB |
715 | input_uV = 0; |
716 | if (rdev->supply) | |
3f24f5ad | 717 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 718 | if (input_uV <= 0) |
414c70cb | 719 | input_uV = rdev->constraints->input_uV; |
8460ef38 BA |
720 | if (input_uV <= 0) { |
721 | rdev_err(rdev, "invalid input voltage found\n"); | |
722 | return -EINVAL; | |
723 | } | |
414c70cb LG |
724 | |
725 | /* calc total requested load */ | |
726 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 727 | current_uA += sibling->uA_load; |
414c70cb | 728 | |
22a10bca SB |
729 | current_uA += rdev->constraints->system_load; |
730 | ||
8f4490e0 BA |
731 | if (rdev->desc->ops->set_load) { |
732 | /* set the optimum mode for our new total regulator load */ | |
733 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
734 | if (err < 0) | |
735 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
736 | } else { | |
737 | /* now get the optimum mode for our new total regulator load */ | |
738 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
739 | output_uV, current_uA); | |
740 | ||
741 | /* check the new mode is allowed */ | |
742 | err = regulator_mode_constrain(rdev, &mode); | |
743 | if (err < 0) { | |
744 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
745 | current_uA, input_uV, output_uV); | |
746 | return err; | |
747 | } | |
414c70cb | 748 | |
8f4490e0 BA |
749 | err = rdev->desc->ops->set_mode(rdev, mode); |
750 | if (err < 0) | |
751 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
752 | } |
753 | ||
8460ef38 | 754 | return err; |
414c70cb LG |
755 | } |
756 | ||
757 | static int suspend_set_state(struct regulator_dev *rdev, | |
758 | struct regulator_state *rstate) | |
759 | { | |
760 | int ret = 0; | |
638f85c5 MB |
761 | |
762 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
763 | * only warn if the driver implements set_suspend_voltage or |
764 | * set_suspend_mode callback. | |
638f85c5 MB |
765 | */ |
766 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
767 | if (rdev->desc->ops->set_suspend_voltage || |
768 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 769 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
770 | return 0; |
771 | } | |
772 | ||
773 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 774 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
775 | return -EINVAL; |
776 | } | |
414c70cb | 777 | |
8ac0e95d | 778 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 779 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 780 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 781 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
782 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
783 | ret = 0; | |
784 | ||
414c70cb | 785 | if (ret < 0) { |
5da84fd9 | 786 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
787 | return ret; |
788 | } | |
789 | ||
790 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
791 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
792 | if (ret < 0) { | |
5da84fd9 | 793 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
794 | return ret; |
795 | } | |
796 | } | |
797 | ||
798 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
799 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
800 | if (ret < 0) { | |
5da84fd9 | 801 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
802 | return ret; |
803 | } | |
804 | } | |
805 | return ret; | |
806 | } | |
807 | ||
808 | /* locks held by caller */ | |
809 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
810 | { | |
70cfef26 KK |
811 | lockdep_assert_held_once(&rdev->mutex); |
812 | ||
414c70cb LG |
813 | if (!rdev->constraints) |
814 | return -EINVAL; | |
815 | ||
816 | switch (state) { | |
817 | case PM_SUSPEND_STANDBY: | |
818 | return suspend_set_state(rdev, | |
819 | &rdev->constraints->state_standby); | |
820 | case PM_SUSPEND_MEM: | |
821 | return suspend_set_state(rdev, | |
822 | &rdev->constraints->state_mem); | |
823 | case PM_SUSPEND_MAX: | |
824 | return suspend_set_state(rdev, | |
825 | &rdev->constraints->state_disk); | |
826 | default: | |
827 | return -EINVAL; | |
828 | } | |
829 | } | |
830 | ||
831 | static void print_constraints(struct regulator_dev *rdev) | |
832 | { | |
833 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 834 | char buf[160] = ""; |
5751a99f | 835 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
836 | int count = 0; |
837 | int ret; | |
414c70cb | 838 | |
8f031b48 | 839 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 840 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
841 | count += scnprintf(buf + count, len - count, "%d mV ", |
842 | constraints->min_uV / 1000); | |
414c70cb | 843 | else |
5751a99f SW |
844 | count += scnprintf(buf + count, len - count, |
845 | "%d <--> %d mV ", | |
846 | constraints->min_uV / 1000, | |
847 | constraints->max_uV / 1000); | |
8f031b48 MB |
848 | } |
849 | ||
850 | if (!constraints->min_uV || | |
851 | constraints->min_uV != constraints->max_uV) { | |
852 | ret = _regulator_get_voltage(rdev); | |
853 | if (ret > 0) | |
5751a99f SW |
854 | count += scnprintf(buf + count, len - count, |
855 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
856 | } |
857 | ||
bf5892a8 | 858 | if (constraints->uV_offset) |
5751a99f SW |
859 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
860 | constraints->uV_offset / 1000); | |
bf5892a8 | 861 | |
8f031b48 | 862 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 863 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
864 | count += scnprintf(buf + count, len - count, "%d mA ", |
865 | constraints->min_uA / 1000); | |
414c70cb | 866 | else |
5751a99f SW |
867 | count += scnprintf(buf + count, len - count, |
868 | "%d <--> %d mA ", | |
869 | constraints->min_uA / 1000, | |
870 | constraints->max_uA / 1000); | |
8f031b48 MB |
871 | } |
872 | ||
873 | if (!constraints->min_uA || | |
874 | constraints->min_uA != constraints->max_uA) { | |
875 | ret = _regulator_get_current_limit(rdev); | |
876 | if (ret > 0) | |
5751a99f SW |
877 | count += scnprintf(buf + count, len - count, |
878 | "at %d mA ", ret / 1000); | |
414c70cb | 879 | } |
8f031b48 | 880 | |
414c70cb | 881 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 882 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 883 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 884 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 885 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 886 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 887 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 888 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 889 | |
215b8b05 | 890 | if (!count) |
5751a99f | 891 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 892 | |
194dbaef | 893 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
894 | |
895 | if ((constraints->min_uV != constraints->max_uV) && | |
896 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
897 | rdev_warn(rdev, | |
898 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
899 | } |
900 | ||
e79055d6 | 901 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 902 | struct regulation_constraints *constraints) |
a5766f11 | 903 | { |
272e2315 | 904 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
905 | int ret; |
906 | ||
907 | /* do we need to apply the constraint voltage */ | |
908 | if (rdev->constraints->apply_uV && | |
75790251 | 909 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
064d5cd1 AB |
910 | int current_uV = _regulator_get_voltage(rdev); |
911 | if (current_uV < 0) { | |
69d58839 NM |
912 | rdev_err(rdev, |
913 | "failed to get the current voltage(%d)\n", | |
914 | current_uV); | |
064d5cd1 AB |
915 | return current_uV; |
916 | } | |
917 | if (current_uV < rdev->constraints->min_uV || | |
918 | current_uV > rdev->constraints->max_uV) { | |
919 | ret = _regulator_do_set_voltage( | |
920 | rdev, rdev->constraints->min_uV, | |
921 | rdev->constraints->max_uV); | |
922 | if (ret < 0) { | |
923 | rdev_err(rdev, | |
69d58839 NM |
924 | "failed to apply %duV constraint(%d)\n", |
925 | rdev->constraints->min_uV, ret); | |
064d5cd1 AB |
926 | return ret; |
927 | } | |
75790251 | 928 | } |
af5866c9 | 929 | } |
e06f5b4f | 930 | |
4367cfdc DB |
931 | /* constrain machine-level voltage specs to fit |
932 | * the actual range supported by this regulator. | |
933 | */ | |
934 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
935 | int count = rdev->desc->n_voltages; | |
936 | int i; | |
937 | int min_uV = INT_MAX; | |
938 | int max_uV = INT_MIN; | |
939 | int cmin = constraints->min_uV; | |
940 | int cmax = constraints->max_uV; | |
941 | ||
3e590918 MB |
942 | /* it's safe to autoconfigure fixed-voltage supplies |
943 | and the constraints are used by list_voltage. */ | |
4367cfdc | 944 | if (count == 1 && !cmin) { |
3e590918 | 945 | cmin = 1; |
4367cfdc | 946 | cmax = INT_MAX; |
3e590918 MB |
947 | constraints->min_uV = cmin; |
948 | constraints->max_uV = cmax; | |
4367cfdc DB |
949 | } |
950 | ||
3e2b9abd MB |
951 | /* voltage constraints are optional */ |
952 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 953 | return 0; |
3e2b9abd | 954 | |
4367cfdc | 955 | /* else require explicit machine-level constraints */ |
3e2b9abd | 956 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 957 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 958 | return -EINVAL; |
4367cfdc DB |
959 | } |
960 | ||
961 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
962 | for (i = 0; i < count; i++) { | |
963 | int value; | |
964 | ||
965 | value = ops->list_voltage(rdev, i); | |
966 | if (value <= 0) | |
967 | continue; | |
968 | ||
969 | /* maybe adjust [min_uV..max_uV] */ | |
970 | if (value >= cmin && value < min_uV) | |
971 | min_uV = value; | |
972 | if (value <= cmax && value > max_uV) | |
973 | max_uV = value; | |
974 | } | |
975 | ||
976 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
977 | if (max_uV < min_uV) { | |
fff15bef MB |
978 | rdev_err(rdev, |
979 | "unsupportable voltage constraints %u-%uuV\n", | |
980 | min_uV, max_uV); | |
e79055d6 | 981 | return -EINVAL; |
4367cfdc DB |
982 | } |
983 | ||
984 | /* use regulator's subset of machine constraints */ | |
985 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
986 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
987 | constraints->min_uV, min_uV); | |
4367cfdc DB |
988 | constraints->min_uV = min_uV; |
989 | } | |
990 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
991 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
992 | constraints->max_uV, max_uV); | |
4367cfdc DB |
993 | constraints->max_uV = max_uV; |
994 | } | |
995 | } | |
996 | ||
e79055d6 MB |
997 | return 0; |
998 | } | |
999 | ||
f8c1700d LD |
1000 | static int machine_constraints_current(struct regulator_dev *rdev, |
1001 | struct regulation_constraints *constraints) | |
1002 | { | |
272e2315 | 1003 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1004 | int ret; |
1005 | ||
1006 | if (!constraints->min_uA && !constraints->max_uA) | |
1007 | return 0; | |
1008 | ||
1009 | if (constraints->min_uA > constraints->max_uA) { | |
1010 | rdev_err(rdev, "Invalid current constraints\n"); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | ||
1014 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1015 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /* Set regulator current in constraints range */ | |
1020 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1021 | constraints->max_uA); | |
1022 | if (ret < 0) { | |
1023 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1024 | return ret; | |
1025 | } | |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
30c21971 MP |
1030 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1031 | ||
e79055d6 MB |
1032 | /** |
1033 | * set_machine_constraints - sets regulator constraints | |
1034 | * @rdev: regulator source | |
1035 | * @constraints: constraints to apply | |
1036 | * | |
1037 | * Allows platform initialisation code to define and constrain | |
1038 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1039 | * Constraints *must* be set by platform code in order for some | |
1040 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1041 | * set_mode. | |
1042 | */ | |
1043 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1044 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1045 | { |
1046 | int ret = 0; | |
272e2315 | 1047 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1048 | |
9a8f5e07 MB |
1049 | if (constraints) |
1050 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1051 | GFP_KERNEL); | |
1052 | else | |
1053 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1054 | GFP_KERNEL); | |
f8c12fe3 MB |
1055 | if (!rdev->constraints) |
1056 | return -ENOMEM; | |
af5866c9 | 1057 | |
f8c12fe3 | 1058 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1059 | if (ret != 0) |
6333ef46 | 1060 | return ret; |
e79055d6 | 1061 | |
f8c1700d | 1062 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1063 | if (ret != 0) |
6333ef46 | 1064 | return ret; |
e79055d6 | 1065 | |
36e4f839 SB |
1066 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1067 | ret = ops->set_input_current_limit(rdev, | |
1068 | rdev->constraints->ilim_uA); | |
1069 | if (ret < 0) { | |
1070 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1071 | return ret; |
36e4f839 SB |
1072 | } |
1073 | } | |
1074 | ||
a5766f11 | 1075 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1076 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1077 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1078 | if (ret < 0) { |
5da84fd9 | 1079 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1080 | return ret; |
e06f5b4f MB |
1081 | } |
1082 | } | |
a5766f11 | 1083 | |
9a8f5e07 | 1084 | if (rdev->constraints->initial_mode) { |
a308466c | 1085 | if (!ops->set_mode) { |
5da84fd9 | 1086 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1087 | return -EINVAL; |
a308466c MB |
1088 | } |
1089 | ||
f8c12fe3 | 1090 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1091 | if (ret < 0) { |
5da84fd9 | 1092 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1093 | return ret; |
a308466c MB |
1094 | } |
1095 | } | |
1096 | ||
cacf90f2 MB |
1097 | /* If the constraints say the regulator should be on at this point |
1098 | * and we have control then make sure it is enabled. | |
1099 | */ | |
30c21971 MP |
1100 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1101 | ret = _regulator_do_enable(rdev); | |
1102 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1103 | rdev_err(rdev, "failed to enable\n"); |
6333ef46 | 1104 | return ret; |
e5fda26c MB |
1105 | } |
1106 | } | |
1107 | ||
1653ccf4 YSB |
1108 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1109 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1110 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1111 | if (ret < 0) { | |
1112 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1113 | return ret; |
6f0b2c69 YSB |
1114 | } |
1115 | } | |
1116 | ||
23c779b9 SB |
1117 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1118 | ret = ops->set_pull_down(rdev); | |
1119 | if (ret < 0) { | |
1120 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1121 | return ret; |
23c779b9 SB |
1122 | } |
1123 | } | |
1124 | ||
57f66b78 SB |
1125 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1126 | ret = ops->set_soft_start(rdev); | |
1127 | if (ret < 0) { | |
1128 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1129 | return ret; |
57f66b78 SB |
1130 | } |
1131 | } | |
1132 | ||
3a003bae SB |
1133 | if (rdev->constraints->over_current_protection |
1134 | && ops->set_over_current_protection) { | |
1135 | ret = ops->set_over_current_protection(rdev); | |
1136 | if (ret < 0) { | |
1137 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1138 | return ret; |
3a003bae SB |
1139 | } |
1140 | } | |
1141 | ||
670666b9 LD |
1142 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1143 | bool ad_state = (rdev->constraints->active_discharge == | |
1144 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1145 | ||
1146 | ret = ops->set_active_discharge(rdev, ad_state); | |
1147 | if (ret < 0) { | |
1148 | rdev_err(rdev, "failed to set active discharge\n"); | |
1149 | return ret; | |
1150 | } | |
1151 | } | |
1152 | ||
909f7ee0 LD |
1153 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1154 | bool ad_state = (rdev->constraints->active_discharge == | |
1155 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1156 | ||
1157 | ret = ops->set_active_discharge(rdev, ad_state); | |
1158 | if (ret < 0) { | |
1159 | rdev_err(rdev, "failed to set active discharge\n"); | |
1160 | return ret; | |
3a003bae SB |
1161 | } |
1162 | } | |
1163 | ||
a5766f11 | 1164 | print_constraints(rdev); |
1a6958e7 | 1165 | return 0; |
a5766f11 LG |
1166 | } |
1167 | ||
1168 | /** | |
1169 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1170 | * @rdev: regulator name |
1171 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1172 | * |
1173 | * Called by platform initialisation code to set the supply regulator for this | |
1174 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1175 | * core if it's child is enabled. | |
1176 | */ | |
1177 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1178 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1179 | { |
1180 | int err; | |
1181 | ||
3801b86a MB |
1182 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1183 | ||
e2c09ae7 JMC |
1184 | if (!try_module_get(supply_rdev->owner)) |
1185 | return -ENODEV; | |
1186 | ||
3801b86a | 1187 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1188 | if (rdev->supply == NULL) { |
1189 | err = -ENOMEM; | |
3801b86a | 1190 | return err; |
a5766f11 | 1191 | } |
57ad526a | 1192 | supply_rdev->open_count++; |
3801b86a MB |
1193 | |
1194 | return 0; | |
a5766f11 LG |
1195 | } |
1196 | ||
1197 | /** | |
06c63f93 | 1198 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1199 | * @rdev: regulator source |
40f9244f | 1200 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1201 | * @supply: symbolic name for supply |
a5766f11 LG |
1202 | * |
1203 | * Allows platform initialisation code to map physical regulator | |
1204 | * sources to symbolic names for supplies for use by devices. Devices | |
1205 | * should use these symbolic names to request regulators, avoiding the | |
1206 | * need to provide board-specific regulator names as platform data. | |
1207 | */ | |
1208 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1209 | const char *consumer_dev_name, |
1210 | const char *supply) | |
a5766f11 LG |
1211 | { |
1212 | struct regulator_map *node; | |
9ed2099e | 1213 | int has_dev; |
a5766f11 LG |
1214 | |
1215 | if (supply == NULL) | |
1216 | return -EINVAL; | |
1217 | ||
9ed2099e MB |
1218 | if (consumer_dev_name != NULL) |
1219 | has_dev = 1; | |
1220 | else | |
1221 | has_dev = 0; | |
1222 | ||
6001e13c | 1223 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1224 | if (node->dev_name && consumer_dev_name) { |
1225 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1226 | continue; | |
1227 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1228 | continue; |
23b5cc2a JN |
1229 | } |
1230 | ||
6001e13c DB |
1231 | if (strcmp(node->supply, supply) != 0) |
1232 | continue; | |
1233 | ||
737f360d MB |
1234 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1235 | consumer_dev_name, | |
1236 | dev_name(&node->regulator->dev), | |
1237 | node->regulator->desc->name, | |
1238 | supply, | |
1239 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1240 | return -EBUSY; |
1241 | } | |
1242 | ||
9ed2099e | 1243 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1244 | if (node == NULL) |
1245 | return -ENOMEM; | |
1246 | ||
1247 | node->regulator = rdev; | |
a5766f11 LG |
1248 | node->supply = supply; |
1249 | ||
9ed2099e MB |
1250 | if (has_dev) { |
1251 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1252 | if (node->dev_name == NULL) { | |
1253 | kfree(node); | |
1254 | return -ENOMEM; | |
1255 | } | |
40f9244f MB |
1256 | } |
1257 | ||
a5766f11 LG |
1258 | list_add(&node->list, ®ulator_map_list); |
1259 | return 0; | |
1260 | } | |
1261 | ||
0f1d747b MR |
1262 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1263 | { | |
1264 | struct regulator_map *node, *n; | |
1265 | ||
1266 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1267 | if (rdev == node->regulator) { | |
1268 | list_del(&node->list); | |
40f9244f | 1269 | kfree(node->dev_name); |
0f1d747b | 1270 | kfree(node); |
0f1d747b MR |
1271 | } |
1272 | } | |
1273 | } | |
1274 | ||
f5726ae3 | 1275 | #define REG_STR_SIZE 64 |
414c70cb LG |
1276 | |
1277 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1278 | struct device *dev, | |
1279 | const char *supply_name) | |
1280 | { | |
1281 | struct regulator *regulator; | |
1282 | char buf[REG_STR_SIZE]; | |
1283 | int err, size; | |
1284 | ||
1285 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1286 | if (regulator == NULL) | |
1287 | return NULL; | |
1288 | ||
1289 | mutex_lock(&rdev->mutex); | |
1290 | regulator->rdev = rdev; | |
1291 | list_add(®ulator->list, &rdev->consumer_list); | |
1292 | ||
1293 | if (dev) { | |
e2c98eaf SG |
1294 | regulator->dev = dev; |
1295 | ||
222cc7b1 | 1296 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1297 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1298 | dev->kobj.name, supply_name); | |
1299 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1300 | goto overflow_err; |
414c70cb LG |
1301 | |
1302 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1303 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1304 | goto overflow_err; |
414c70cb | 1305 | |
ff268b56 | 1306 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1307 | buf); |
1308 | if (err) { | |
ff268b56 | 1309 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1310 | dev->kobj.name, err); |
222cc7b1 | 1311 | /* non-fatal */ |
414c70cb | 1312 | } |
5de70519 MB |
1313 | } else { |
1314 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1315 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1316 | goto overflow_err; |
5de70519 MB |
1317 | } |
1318 | ||
5de70519 MB |
1319 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1320 | rdev->debugfs); | |
24751434 | 1321 | if (!regulator->debugfs) { |
ad3a942b | 1322 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1323 | } else { |
1324 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1325 | ®ulator->uA_load); | |
1326 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1327 | ®ulator->min_uV); | |
1328 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1329 | ®ulator->max_uV); | |
414c70cb | 1330 | } |
5de70519 | 1331 | |
6492bc1b MB |
1332 | /* |
1333 | * Check now if the regulator is an always on regulator - if | |
1334 | * it is then we don't need to do nearly so much work for | |
1335 | * enable/disable calls. | |
1336 | */ | |
1337 | if (!_regulator_can_change_status(rdev) && | |
1338 | _regulator_is_enabled(rdev)) | |
1339 | regulator->always_on = true; | |
1340 | ||
414c70cb LG |
1341 | mutex_unlock(&rdev->mutex); |
1342 | return regulator; | |
414c70cb LG |
1343 | overflow_err: |
1344 | list_del(®ulator->list); | |
1345 | kfree(regulator); | |
1346 | mutex_unlock(&rdev->mutex); | |
1347 | return NULL; | |
1348 | } | |
1349 | ||
31aae2be MB |
1350 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1351 | { | |
00c877c6 LD |
1352 | if (rdev->constraints && rdev->constraints->enable_time) |
1353 | return rdev->constraints->enable_time; | |
31aae2be | 1354 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1355 | return rdev->desc->enable_time; |
31aae2be MB |
1356 | return rdev->desc->ops->enable_time(rdev); |
1357 | } | |
1358 | ||
a06ccd9c CK |
1359 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1360 | struct device *dev, const char *supply) | |
1361 | { | |
1362 | struct regulator_supply_alias *map; | |
1363 | ||
1364 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1365 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1366 | return map; | |
1367 | ||
1368 | return NULL; | |
1369 | } | |
1370 | ||
1371 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1372 | { | |
1373 | struct regulator_supply_alias *map; | |
1374 | ||
1375 | map = regulator_find_supply_alias(*dev, *supply); | |
1376 | if (map) { | |
1377 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1378 | *supply, map->alias_supply, | |
1379 | dev_name(map->alias_dev)); | |
1380 | *dev = map->alias_dev; | |
1381 | *supply = map->alias_supply; | |
1382 | } | |
1383 | } | |
1384 | ||
85f3b431 TV |
1385 | static int of_node_match(struct device *dev, const void *data) |
1386 | { | |
1387 | return dev->of_node == data; | |
1388 | } | |
1389 | ||
1390 | static struct regulator_dev *of_find_regulator_by_node(struct device_node *np) | |
1391 | { | |
1392 | struct device *dev; | |
1393 | ||
1394 | dev = class_find_device(®ulator_class, NULL, np, of_node_match); | |
1395 | ||
1396 | return dev ? dev_to_rdev(dev) : NULL; | |
1397 | } | |
1398 | ||
1399 | static int regulator_match(struct device *dev, const void *data) | |
1400 | { | |
1401 | struct regulator_dev *r = dev_to_rdev(dev); | |
1402 | ||
1403 | return strcmp(rdev_get_name(r), data) == 0; | |
1404 | } | |
1405 | ||
1406 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1407 | { | |
1408 | struct device *dev; | |
1409 | ||
1410 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1411 | ||
1412 | return dev ? dev_to_rdev(dev) : NULL; | |
1413 | } | |
1414 | ||
1415 | /** | |
1416 | * regulator_dev_lookup - lookup a regulator device. | |
1417 | * @dev: device for regulator "consumer". | |
1418 | * @supply: Supply name or regulator ID. | |
1419 | * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if | |
1420 | * lookup could succeed in the future. | |
1421 | * | |
1422 | * If successful, returns a struct regulator_dev that corresponds to the name | |
1423 | * @supply and with the embedded struct device refcount incremented by one, | |
1424 | * or NULL on failure. The refcount must be dropped by calling put_device(). | |
1425 | */ | |
69511a45 | 1426 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1427 | const char *supply, |
1428 | int *ret) | |
69511a45 RN |
1429 | { |
1430 | struct regulator_dev *r; | |
1431 | struct device_node *node; | |
576ca436 MB |
1432 | struct regulator_map *map; |
1433 | const char *devname = NULL; | |
69511a45 | 1434 | |
a06ccd9c CK |
1435 | regulator_supply_alias(&dev, &supply); |
1436 | ||
69511a45 RN |
1437 | /* first do a dt based lookup */ |
1438 | if (dev && dev->of_node) { | |
1439 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1440 | if (node) { |
85f3b431 TV |
1441 | r = of_find_regulator_by_node(node); |
1442 | if (r) | |
1443 | return r; | |
317b5684 MB |
1444 | *ret = -EPROBE_DEFER; |
1445 | return NULL; | |
6d191a5f MB |
1446 | } else { |
1447 | /* | |
1448 | * If we couldn't even get the node then it's | |
1449 | * not just that the device didn't register | |
1450 | * yet, there's no node and we'll never | |
1451 | * succeed. | |
1452 | */ | |
1453 | *ret = -ENODEV; | |
1454 | } | |
69511a45 RN |
1455 | } |
1456 | ||
1457 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1458 | if (dev) |
1459 | devname = dev_name(dev); | |
1460 | ||
85f3b431 TV |
1461 | r = regulator_lookup_by_name(supply); |
1462 | if (r) | |
1463 | return r; | |
69511a45 | 1464 | |
85f3b431 | 1465 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1466 | list_for_each_entry(map, ®ulator_map_list, list) { |
1467 | /* If the mapping has a device set up it must match */ | |
1468 | if (map->dev_name && | |
1469 | (!devname || strcmp(map->dev_name, devname))) | |
1470 | continue; | |
1471 | ||
85f3b431 TV |
1472 | if (strcmp(map->supply, supply) == 0 && |
1473 | get_device(&map->regulator->dev)) { | |
1474 | mutex_unlock(®ulator_list_mutex); | |
576ca436 | 1475 | return map->regulator; |
85f3b431 | 1476 | } |
576ca436 | 1477 | } |
85f3b431 | 1478 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1479 | |
69511a45 RN |
1480 | return NULL; |
1481 | } | |
1482 | ||
6261b06d BA |
1483 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1484 | { | |
1485 | struct regulator_dev *r; | |
1486 | struct device *dev = rdev->dev.parent; | |
1487 | int ret; | |
1488 | ||
1489 | /* No supply to resovle? */ | |
1490 | if (!rdev->supply_name) | |
1491 | return 0; | |
1492 | ||
1493 | /* Supply already resolved? */ | |
1494 | if (rdev->supply) | |
1495 | return 0; | |
1496 | ||
1497 | r = regulator_dev_lookup(dev, rdev->supply_name, &ret); | |
6261b06d | 1498 | if (!r) { |
23c3f310 CK |
1499 | if (ret == -ENODEV) { |
1500 | /* | |
1501 | * No supply was specified for this regulator and | |
1502 | * there will never be one. | |
1503 | */ | |
1504 | return 0; | |
1505 | } | |
1506 | ||
06423121 MB |
1507 | /* Did the lookup explicitly defer for us? */ |
1508 | if (ret == -EPROBE_DEFER) | |
1509 | return ret; | |
1510 | ||
9f7e25ed MB |
1511 | if (have_full_constraints()) { |
1512 | r = dummy_regulator_rdev; | |
85f3b431 | 1513 | get_device(&r->dev); |
9f7e25ed MB |
1514 | } else { |
1515 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1516 | rdev->supply_name, rdev->desc->name); | |
1517 | return -EPROBE_DEFER; | |
1518 | } | |
6261b06d BA |
1519 | } |
1520 | ||
1521 | /* Recursively resolve the supply of the supply */ | |
1522 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1523 | if (ret < 0) { |
1524 | put_device(&r->dev); | |
6261b06d | 1525 | return ret; |
85f3b431 | 1526 | } |
6261b06d BA |
1527 | |
1528 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1529 | if (ret < 0) { |
1530 | put_device(&r->dev); | |
6261b06d | 1531 | return ret; |
85f3b431 | 1532 | } |
6261b06d BA |
1533 | |
1534 | /* Cascade always-on state to supply */ | |
9f8df6ad | 1535 | if (_regulator_is_enabled(rdev) && rdev->supply) { |
6261b06d | 1536 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1537 | if (ret < 0) { |
9f8df6ad | 1538 | _regulator_put(rdev->supply); |
6261b06d | 1539 | return ret; |
36a1f1b6 | 1540 | } |
6261b06d BA |
1541 | } |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
5ffbd136 MB |
1546 | /* Internal regulator request function */ |
1547 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1548 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1549 | { |
1550 | struct regulator_dev *rdev; | |
04bf3011 | 1551 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1552 | const char *devname = NULL; |
317b5684 | 1553 | int ret; |
414c70cb LG |
1554 | |
1555 | if (id == NULL) { | |
5da84fd9 | 1556 | pr_err("get() with no identifier\n"); |
043c998f | 1557 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1558 | } |
1559 | ||
40f9244f MB |
1560 | if (dev) |
1561 | devname = dev_name(dev); | |
1562 | ||
317b5684 MB |
1563 | if (have_full_constraints()) |
1564 | ret = -ENODEV; | |
1565 | else | |
1566 | ret = -EPROBE_DEFER; | |
1567 | ||
6d191a5f | 1568 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1569 | if (rdev) |
1570 | goto found; | |
1571 | ||
ef60abbb MB |
1572 | regulator = ERR_PTR(ret); |
1573 | ||
1e4b545c NM |
1574 | /* |
1575 | * If we have return value from dev_lookup fail, we do not expect to | |
1576 | * succeed, so, quit with appropriate error value | |
1577 | */ | |
0d25d09d | 1578 | if (ret && ret != -ENODEV) |
85f3b431 | 1579 | return regulator; |
1e4b545c | 1580 | |
34abbd68 MB |
1581 | if (!devname) |
1582 | devname = "deviceless"; | |
1583 | ||
4ddfebd3 MB |
1584 | /* |
1585 | * Assume that a regulator is physically present and enabled | |
1586 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1587 | */ |
87b28417 | 1588 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1589 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1590 | devname, id); | |
4ddfebd3 | 1591 | |
34abbd68 | 1592 | rdev = dummy_regulator_rdev; |
85f3b431 | 1593 | get_device(&rdev->dev); |
34abbd68 | 1594 | goto found; |
0781719b HG |
1595 | /* Don't log an error when called from regulator_get_optional() */ |
1596 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1597 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1598 | } |
34abbd68 | 1599 | |
414c70cb LG |
1600 | return regulator; |
1601 | ||
1602 | found: | |
5ffbd136 MB |
1603 | if (rdev->exclusive) { |
1604 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1605 | put_device(&rdev->dev); |
1606 | return regulator; | |
5ffbd136 MB |
1607 | } |
1608 | ||
1609 | if (exclusive && rdev->open_count) { | |
1610 | regulator = ERR_PTR(-EBUSY); | |
85f3b431 TV |
1611 | put_device(&rdev->dev); |
1612 | return regulator; | |
5ffbd136 MB |
1613 | } |
1614 | ||
6261b06d BA |
1615 | ret = regulator_resolve_supply(rdev); |
1616 | if (ret < 0) { | |
1617 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1618 | put_device(&rdev->dev); |
1619 | return regulator; | |
6261b06d BA |
1620 | } |
1621 | ||
85f3b431 TV |
1622 | if (!try_module_get(rdev->owner)) { |
1623 | put_device(&rdev->dev); | |
1624 | return regulator; | |
1625 | } | |
a5766f11 | 1626 | |
414c70cb LG |
1627 | regulator = create_regulator(rdev, dev, id); |
1628 | if (regulator == NULL) { | |
1629 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1630 | put_device(&rdev->dev); |
414c70cb | 1631 | module_put(rdev->owner); |
85f3b431 | 1632 | return regulator; |
414c70cb LG |
1633 | } |
1634 | ||
5ffbd136 MB |
1635 | rdev->open_count++; |
1636 | if (exclusive) { | |
1637 | rdev->exclusive = 1; | |
1638 | ||
1639 | ret = _regulator_is_enabled(rdev); | |
1640 | if (ret > 0) | |
1641 | rdev->use_count = 1; | |
1642 | else | |
1643 | rdev->use_count = 0; | |
1644 | } | |
1645 | ||
414c70cb LG |
1646 | return regulator; |
1647 | } | |
5ffbd136 MB |
1648 | |
1649 | /** | |
1650 | * regulator_get - lookup and obtain a reference to a regulator. | |
1651 | * @dev: device for regulator "consumer" | |
1652 | * @id: Supply name or regulator ID. | |
1653 | * | |
1654 | * Returns a struct regulator corresponding to the regulator producer, | |
1655 | * or IS_ERR() condition containing errno. | |
1656 | * | |
1657 | * Use of supply names configured via regulator_set_device_supply() is | |
1658 | * strongly encouraged. It is recommended that the supply name used | |
1659 | * should match the name used for the supply and/or the relevant | |
1660 | * device pins in the datasheet. | |
1661 | */ | |
1662 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1663 | { | |
4ddfebd3 | 1664 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1665 | } |
414c70cb LG |
1666 | EXPORT_SYMBOL_GPL(regulator_get); |
1667 | ||
5ffbd136 MB |
1668 | /** |
1669 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1670 | * @dev: device for regulator "consumer" | |
1671 | * @id: Supply name or regulator ID. | |
1672 | * | |
1673 | * Returns a struct regulator corresponding to the regulator producer, | |
1674 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1675 | * unable to obtain this regulator while this reference is held and the |
1676 | * use count for the regulator will be initialised to reflect the current | |
1677 | * state of the regulator. | |
5ffbd136 MB |
1678 | * |
1679 | * This is intended for use by consumers which cannot tolerate shared | |
1680 | * use of the regulator such as those which need to force the | |
1681 | * regulator off for correct operation of the hardware they are | |
1682 | * controlling. | |
1683 | * | |
1684 | * Use of supply names configured via regulator_set_device_supply() is | |
1685 | * strongly encouraged. It is recommended that the supply name used | |
1686 | * should match the name used for the supply and/or the relevant | |
1687 | * device pins in the datasheet. | |
1688 | */ | |
1689 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1690 | { | |
4ddfebd3 | 1691 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1692 | } |
1693 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1694 | ||
de1dd9fd MB |
1695 | /** |
1696 | * regulator_get_optional - obtain optional access to a regulator. | |
1697 | * @dev: device for regulator "consumer" | |
1698 | * @id: Supply name or regulator ID. | |
1699 | * | |
1700 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1701 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1702 | * |
1703 | * This is intended for use by consumers for devices which can have | |
1704 | * some supplies unconnected in normal use, such as some MMC devices. | |
1705 | * It can allow the regulator core to provide stub supplies for other | |
1706 | * supplies requested using normal regulator_get() calls without | |
1707 | * disrupting the operation of drivers that can handle absent | |
1708 | * supplies. | |
1709 | * | |
1710 | * Use of supply names configured via regulator_set_device_supply() is | |
1711 | * strongly encouraged. It is recommended that the supply name used | |
1712 | * should match the name used for the supply and/or the relevant | |
1713 | * device pins in the datasheet. | |
1714 | */ | |
1715 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1716 | { | |
4ddfebd3 | 1717 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1718 | } |
1719 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1720 | ||
83b0302d | 1721 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1722 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1723 | { |
1724 | struct regulator_dev *rdev; | |
1725 | ||
93576842 | 1726 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
1727 | return; |
1728 | ||
70cfef26 KK |
1729 | lockdep_assert_held_once(®ulator_list_mutex); |
1730 | ||
414c70cb LG |
1731 | rdev = regulator->rdev; |
1732 | ||
5de70519 | 1733 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1734 | |
414c70cb | 1735 | /* remove any sysfs entries */ |
e2c98eaf | 1736 | if (regulator->dev) |
414c70cb | 1737 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1738 | mutex_lock(&rdev->mutex); |
414c70cb | 1739 | list_del(®ulator->list); |
414c70cb | 1740 | |
5ffbd136 MB |
1741 | rdev->open_count--; |
1742 | rdev->exclusive = 0; | |
85f3b431 | 1743 | put_device(&rdev->dev); |
83b0302d | 1744 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1745 | |
1768514e MB |
1746 | kfree(regulator->supply_name); |
1747 | kfree(regulator); | |
1748 | ||
414c70cb | 1749 | module_put(rdev->owner); |
23ff2f0f CK |
1750 | } |
1751 | ||
1752 | /** | |
1753 | * regulator_put - "free" the regulator source | |
1754 | * @regulator: regulator source | |
1755 | * | |
1756 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1757 | * regulator source are balanced by regulator_disable calls prior to calling | |
1758 | * this function. | |
1759 | */ | |
1760 | void regulator_put(struct regulator *regulator) | |
1761 | { | |
1762 | mutex_lock(®ulator_list_mutex); | |
1763 | _regulator_put(regulator); | |
414c70cb LG |
1764 | mutex_unlock(®ulator_list_mutex); |
1765 | } | |
1766 | EXPORT_SYMBOL_GPL(regulator_put); | |
1767 | ||
a06ccd9c CK |
1768 | /** |
1769 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1770 | * | |
1771 | * @dev: device that will be given as the regulator "consumer" | |
1772 | * @id: Supply name or regulator ID | |
1773 | * @alias_dev: device that should be used to lookup the supply | |
1774 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1775 | * supply | |
1776 | * | |
1777 | * All lookups for id on dev will instead be conducted for alias_id on | |
1778 | * alias_dev. | |
1779 | */ | |
1780 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1781 | struct device *alias_dev, | |
1782 | const char *alias_id) | |
1783 | { | |
1784 | struct regulator_supply_alias *map; | |
1785 | ||
1786 | map = regulator_find_supply_alias(dev, id); | |
1787 | if (map) | |
1788 | return -EEXIST; | |
1789 | ||
1790 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1791 | if (!map) | |
1792 | return -ENOMEM; | |
1793 | ||
1794 | map->src_dev = dev; | |
1795 | map->src_supply = id; | |
1796 | map->alias_dev = alias_dev; | |
1797 | map->alias_supply = alias_id; | |
1798 | ||
1799 | list_add(&map->list, ®ulator_supply_alias_list); | |
1800 | ||
1801 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1802 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1803 | ||
1804 | return 0; | |
1805 | } | |
1806 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1807 | ||
1808 | /** | |
1809 | * regulator_unregister_supply_alias - Remove device alias | |
1810 | * | |
1811 | * @dev: device that will be given as the regulator "consumer" | |
1812 | * @id: Supply name or regulator ID | |
1813 | * | |
1814 | * Remove a lookup alias if one exists for id on dev. | |
1815 | */ | |
1816 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1817 | { | |
1818 | struct regulator_supply_alias *map; | |
1819 | ||
1820 | map = regulator_find_supply_alias(dev, id); | |
1821 | if (map) { | |
1822 | list_del(&map->list); | |
1823 | kfree(map); | |
1824 | } | |
1825 | } | |
1826 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1827 | ||
1828 | /** | |
1829 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1830 | * | |
1831 | * @dev: device that will be given as the regulator "consumer" | |
1832 | * @id: List of supply names or regulator IDs | |
1833 | * @alias_dev: device that should be used to lookup the supply | |
1834 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1835 | * lookup the supply | |
1836 | * @num_id: Number of aliases to register | |
1837 | * | |
1838 | * @return 0 on success, an errno on failure. | |
1839 | * | |
1840 | * This helper function allows drivers to register several supply | |
1841 | * aliases in one operation. If any of the aliases cannot be | |
1842 | * registered any aliases that were registered will be removed | |
1843 | * before returning to the caller. | |
1844 | */ | |
9f8c0fe9 LJ |
1845 | int regulator_bulk_register_supply_alias(struct device *dev, |
1846 | const char *const *id, | |
a06ccd9c | 1847 | struct device *alias_dev, |
9f8c0fe9 | 1848 | const char *const *alias_id, |
a06ccd9c CK |
1849 | int num_id) |
1850 | { | |
1851 | int i; | |
1852 | int ret; | |
1853 | ||
1854 | for (i = 0; i < num_id; ++i) { | |
1855 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1856 | alias_id[i]); | |
1857 | if (ret < 0) | |
1858 | goto err; | |
1859 | } | |
1860 | ||
1861 | return 0; | |
1862 | ||
1863 | err: | |
1864 | dev_err(dev, | |
1865 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1866 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1867 | ||
1868 | while (--i >= 0) | |
1869 | regulator_unregister_supply_alias(dev, id[i]); | |
1870 | ||
1871 | return ret; | |
1872 | } | |
1873 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1874 | ||
1875 | /** | |
1876 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1877 | * | |
1878 | * @dev: device that will be given as the regulator "consumer" | |
1879 | * @id: List of supply names or regulator IDs | |
1880 | * @num_id: Number of aliases to unregister | |
1881 | * | |
1882 | * This helper function allows drivers to unregister several supply | |
1883 | * aliases in one operation. | |
1884 | */ | |
1885 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1886 | const char *const *id, |
a06ccd9c CK |
1887 | int num_id) |
1888 | { | |
1889 | int i; | |
1890 | ||
1891 | for (i = 0; i < num_id; ++i) | |
1892 | regulator_unregister_supply_alias(dev, id[i]); | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1895 | ||
1896 | ||
f19b00da KM |
1897 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1898 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1899 | const struct regulator_config *config) | |
1900 | { | |
1901 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1902 | struct gpio_desc *gpiod; |
f19b00da KM |
1903 | int ret; |
1904 | ||
778b28b4 RK |
1905 | gpiod = gpio_to_desc(config->ena_gpio); |
1906 | ||
f19b00da | 1907 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1908 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1909 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1910 | config->ena_gpio); | |
1911 | goto update_ena_gpio_to_rdev; | |
1912 | } | |
1913 | } | |
1914 | ||
1915 | ret = gpio_request_one(config->ena_gpio, | |
1916 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1917 | rdev_get_name(rdev)); | |
1918 | if (ret) | |
1919 | return ret; | |
1920 | ||
1921 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1922 | if (pin == NULL) { | |
1923 | gpio_free(config->ena_gpio); | |
1924 | return -ENOMEM; | |
1925 | } | |
1926 | ||
778b28b4 | 1927 | pin->gpiod = gpiod; |
f19b00da KM |
1928 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1929 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1930 | ||
1931 | update_ena_gpio_to_rdev: | |
1932 | pin->request_count++; | |
1933 | rdev->ena_pin = pin; | |
1934 | return 0; | |
1935 | } | |
1936 | ||
1937 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1938 | { | |
1939 | struct regulator_enable_gpio *pin, *n; | |
1940 | ||
1941 | if (!rdev->ena_pin) | |
1942 | return; | |
1943 | ||
1944 | /* Free the GPIO only in case of no use */ | |
1945 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1946 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1947 | if (pin->request_count <= 1) { |
1948 | pin->request_count = 0; | |
778b28b4 | 1949 | gpiod_put(pin->gpiod); |
f19b00da KM |
1950 | list_del(&pin->list); |
1951 | kfree(pin); | |
60a2362f SWK |
1952 | rdev->ena_pin = NULL; |
1953 | return; | |
f19b00da KM |
1954 | } else { |
1955 | pin->request_count--; | |
1956 | } | |
1957 | } | |
1958 | } | |
1959 | } | |
1960 | ||
967cfb18 | 1961 | /** |
31d6eebf RD |
1962 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1963 | * @rdev: regulator_dev structure | |
1964 | * @enable: enable GPIO at initial use? | |
1965 | * | |
967cfb18 KM |
1966 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1967 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1968 | */ | |
1969 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1970 | { | |
1971 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1972 | ||
1973 | if (!pin) | |
1974 | return -EINVAL; | |
1975 | ||
1976 | if (enable) { | |
1977 | /* Enable GPIO at initial use */ | |
1978 | if (pin->enable_count == 0) | |
778b28b4 RK |
1979 | gpiod_set_value_cansleep(pin->gpiod, |
1980 | !pin->ena_gpio_invert); | |
967cfb18 KM |
1981 | |
1982 | pin->enable_count++; | |
1983 | } else { | |
1984 | if (pin->enable_count > 1) { | |
1985 | pin->enable_count--; | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | /* Disable GPIO if not used */ | |
1990 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
1991 | gpiod_set_value_cansleep(pin->gpiod, |
1992 | pin->ena_gpio_invert); | |
967cfb18 KM |
1993 | pin->enable_count = 0; |
1994 | } | |
1995 | } | |
1996 | ||
1997 | return 0; | |
1998 | } | |
1999 | ||
79fd1141 GX |
2000 | /** |
2001 | * _regulator_enable_delay - a delay helper function | |
2002 | * @delay: time to delay in microseconds | |
2003 | * | |
2004 | * Delay for the requested amount of time as per the guidelines in: | |
2005 | * | |
2006 | * Documentation/timers/timers-howto.txt | |
2007 | * | |
2008 | * The assumption here is that regulators will never be enabled in | |
2009 | * atomic context and therefore sleeping functions can be used. | |
2010 | */ | |
2011 | static void _regulator_enable_delay(unsigned int delay) | |
2012 | { | |
2013 | unsigned int ms = delay / 1000; | |
2014 | unsigned int us = delay % 1000; | |
2015 | ||
2016 | if (ms > 0) { | |
2017 | /* | |
2018 | * For small enough values, handle super-millisecond | |
2019 | * delays in the usleep_range() call below. | |
2020 | */ | |
2021 | if (ms < 20) | |
2022 | us += ms * 1000; | |
2023 | else | |
2024 | msleep(ms); | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Give the scheduler some room to coalesce with any other | |
2029 | * wakeup sources. For delays shorter than 10 us, don't even | |
2030 | * bother setting up high-resolution timers and just busy- | |
2031 | * loop. | |
2032 | */ | |
2033 | if (us >= 10) | |
2034 | usleep_range(us, us + 100); | |
2035 | else | |
2036 | udelay(us); | |
2037 | } | |
2038 | ||
5c5659d0 MB |
2039 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2040 | { | |
2041 | int ret, delay; | |
2042 | ||
2043 | /* Query before enabling in case configuration dependent. */ | |
2044 | ret = _regulator_get_enable_time(rdev); | |
2045 | if (ret >= 0) { | |
2046 | delay = ret; | |
2047 | } else { | |
2048 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2049 | delay = 0; | |
2050 | } | |
2051 | ||
2052 | trace_regulator_enable(rdev_get_name(rdev)); | |
2053 | ||
871f5650 GX |
2054 | if (rdev->desc->off_on_delay) { |
2055 | /* if needed, keep a distance of off_on_delay from last time | |
2056 | * this regulator was disabled. | |
2057 | */ | |
2058 | unsigned long start_jiffy = jiffies; | |
2059 | unsigned long intended, max_delay, remaining; | |
2060 | ||
2061 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2062 | intended = rdev->last_off_jiffy + max_delay; | |
2063 | ||
2064 | if (time_before(start_jiffy, intended)) { | |
2065 | /* calc remaining jiffies to deal with one-time | |
2066 | * timer wrapping. | |
2067 | * in case of multiple timer wrapping, either it can be | |
2068 | * detected by out-of-range remaining, or it cannot be | |
2069 | * detected and we gets a panelty of | |
2070 | * _regulator_enable_delay(). | |
2071 | */ | |
2072 | remaining = intended - start_jiffy; | |
2073 | if (remaining <= max_delay) | |
2074 | _regulator_enable_delay( | |
2075 | jiffies_to_usecs(remaining)); | |
2076 | } | |
2077 | } | |
2078 | ||
967cfb18 | 2079 | if (rdev->ena_pin) { |
29d62ec5 DA |
2080 | if (!rdev->ena_gpio_state) { |
2081 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2082 | if (ret < 0) | |
2083 | return ret; | |
2084 | rdev->ena_gpio_state = 1; | |
2085 | } | |
65f73508 | 2086 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2087 | ret = rdev->desc->ops->enable(rdev); |
2088 | if (ret < 0) | |
2089 | return ret; | |
2090 | } else { | |
2091 | return -EINVAL; | |
2092 | } | |
2093 | ||
2094 | /* Allow the regulator to ramp; it would be useful to extend | |
2095 | * this for bulk operations so that the regulators can ramp | |
2096 | * together. */ | |
2097 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2098 | ||
79fd1141 | 2099 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2100 | |
2101 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2102 | ||
2103 | return 0; | |
2104 | } | |
2105 | ||
414c70cb LG |
2106 | /* locks held by regulator_enable() */ |
2107 | static int _regulator_enable(struct regulator_dev *rdev) | |
2108 | { | |
5c5659d0 | 2109 | int ret; |
414c70cb | 2110 | |
70cfef26 KK |
2111 | lockdep_assert_held_once(&rdev->mutex); |
2112 | ||
414c70cb | 2113 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
2114 | if (rdev->constraints && |
2115 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
2116 | drms_uA_update(rdev); | |
414c70cb | 2117 | |
9a2372fa MB |
2118 | if (rdev->use_count == 0) { |
2119 | /* The regulator may on if it's not switchable or left on */ | |
2120 | ret = _regulator_is_enabled(rdev); | |
2121 | if (ret == -EINVAL || ret == 0) { | |
2122 | if (!_regulator_can_change_status(rdev)) | |
2123 | return -EPERM; | |
2124 | ||
5c5659d0 | 2125 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
2126 | if (ret < 0) |
2127 | return ret; | |
2128 | ||
a7433cff | 2129 | } else if (ret < 0) { |
5da84fd9 | 2130 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
2131 | return ret; |
2132 | } | |
a7433cff | 2133 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2134 | } |
2135 | ||
9a2372fa MB |
2136 | rdev->use_count++; |
2137 | ||
2138 | return 0; | |
414c70cb LG |
2139 | } |
2140 | ||
2141 | /** | |
2142 | * regulator_enable - enable regulator output | |
2143 | * @regulator: regulator source | |
2144 | * | |
cf7bbcdf MB |
2145 | * Request that the regulator be enabled with the regulator output at |
2146 | * the predefined voltage or current value. Calls to regulator_enable() | |
2147 | * must be balanced with calls to regulator_disable(). | |
2148 | * | |
414c70cb | 2149 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2150 | * hardwired in the regulator. |
414c70cb LG |
2151 | */ |
2152 | int regulator_enable(struct regulator *regulator) | |
2153 | { | |
412aec61 DB |
2154 | struct regulator_dev *rdev = regulator->rdev; |
2155 | int ret = 0; | |
414c70cb | 2156 | |
6492bc1b MB |
2157 | if (regulator->always_on) |
2158 | return 0; | |
2159 | ||
3801b86a MB |
2160 | if (rdev->supply) { |
2161 | ret = regulator_enable(rdev->supply); | |
2162 | if (ret != 0) | |
2163 | return ret; | |
2164 | } | |
2165 | ||
412aec61 | 2166 | mutex_lock(&rdev->mutex); |
cd94b505 | 2167 | ret = _regulator_enable(rdev); |
412aec61 | 2168 | mutex_unlock(&rdev->mutex); |
3801b86a | 2169 | |
d1685e4e | 2170 | if (ret != 0 && rdev->supply) |
3801b86a MB |
2171 | regulator_disable(rdev->supply); |
2172 | ||
414c70cb LG |
2173 | return ret; |
2174 | } | |
2175 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2176 | ||
5c5659d0 MB |
2177 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2178 | { | |
2179 | int ret; | |
2180 | ||
2181 | trace_regulator_disable(rdev_get_name(rdev)); | |
2182 | ||
967cfb18 | 2183 | if (rdev->ena_pin) { |
29d62ec5 DA |
2184 | if (rdev->ena_gpio_state) { |
2185 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2186 | if (ret < 0) | |
2187 | return ret; | |
2188 | rdev->ena_gpio_state = 0; | |
2189 | } | |
5c5659d0 MB |
2190 | |
2191 | } else if (rdev->desc->ops->disable) { | |
2192 | ret = rdev->desc->ops->disable(rdev); | |
2193 | if (ret != 0) | |
2194 | return ret; | |
2195 | } | |
2196 | ||
871f5650 GX |
2197 | /* cares about last_off_jiffy only if off_on_delay is required by |
2198 | * device. | |
2199 | */ | |
2200 | if (rdev->desc->off_on_delay) | |
2201 | rdev->last_off_jiffy = jiffies; | |
2202 | ||
5c5659d0 MB |
2203 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2204 | ||
5c5659d0 MB |
2205 | return 0; |
2206 | } | |
2207 | ||
414c70cb | 2208 | /* locks held by regulator_disable() */ |
3801b86a | 2209 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2210 | { |
2211 | int ret = 0; | |
2212 | ||
70cfef26 KK |
2213 | lockdep_assert_held_once(&rdev->mutex); |
2214 | ||
cd94b505 | 2215 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2216 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2217 | return -EIO; |
2218 | ||
414c70cb | 2219 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2220 | if (rdev->use_count == 1 && |
2221 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2222 | |
2223 | /* we are last user */ | |
5c5659d0 | 2224 | if (_regulator_can_change_status(rdev)) { |
a1c8a551 RF |
2225 | ret = _notifier_call_chain(rdev, |
2226 | REGULATOR_EVENT_PRE_DISABLE, | |
2227 | NULL); | |
2228 | if (ret & NOTIFY_STOP_MASK) | |
2229 | return -EINVAL; | |
2230 | ||
5c5659d0 | 2231 | ret = _regulator_do_disable(rdev); |
414c70cb | 2232 | if (ret < 0) { |
5da84fd9 | 2233 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2234 | _notifier_call_chain(rdev, |
2235 | REGULATOR_EVENT_ABORT_DISABLE, | |
2236 | NULL); | |
414c70cb LG |
2237 | return ret; |
2238 | } | |
66fda75f MP |
2239 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2240 | NULL); | |
414c70cb LG |
2241 | } |
2242 | ||
414c70cb LG |
2243 | rdev->use_count = 0; |
2244 | } else if (rdev->use_count > 1) { | |
2245 | ||
2246 | if (rdev->constraints && | |
2247 | (rdev->constraints->valid_ops_mask & | |
2248 | REGULATOR_CHANGE_DRMS)) | |
2249 | drms_uA_update(rdev); | |
2250 | ||
2251 | rdev->use_count--; | |
2252 | } | |
3801b86a | 2253 | |
414c70cb LG |
2254 | return ret; |
2255 | } | |
2256 | ||
2257 | /** | |
2258 | * regulator_disable - disable regulator output | |
2259 | * @regulator: regulator source | |
2260 | * | |
cf7bbcdf MB |
2261 | * Disable the regulator output voltage or current. Calls to |
2262 | * regulator_enable() must be balanced with calls to | |
2263 | * regulator_disable(). | |
69279fb9 | 2264 | * |
414c70cb | 2265 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2266 | * devices have it enabled, the regulator device supports disabling and |
2267 | * machine constraints permit this operation. | |
414c70cb LG |
2268 | */ |
2269 | int regulator_disable(struct regulator *regulator) | |
2270 | { | |
412aec61 DB |
2271 | struct regulator_dev *rdev = regulator->rdev; |
2272 | int ret = 0; | |
414c70cb | 2273 | |
6492bc1b MB |
2274 | if (regulator->always_on) |
2275 | return 0; | |
2276 | ||
412aec61 | 2277 | mutex_lock(&rdev->mutex); |
3801b86a | 2278 | ret = _regulator_disable(rdev); |
412aec61 | 2279 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2280 | |
3801b86a MB |
2281 | if (ret == 0 && rdev->supply) |
2282 | regulator_disable(rdev->supply); | |
8cbf811d | 2283 | |
414c70cb LG |
2284 | return ret; |
2285 | } | |
2286 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2287 | ||
2288 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2289 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2290 | { |
2291 | int ret = 0; | |
2292 | ||
70cfef26 KK |
2293 | lockdep_assert_held_once(&rdev->mutex); |
2294 | ||
a1c8a551 RF |
2295 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2296 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2297 | if (ret & NOTIFY_STOP_MASK) | |
2298 | return -EINVAL; | |
2299 | ||
66fda75f MP |
2300 | ret = _regulator_do_disable(rdev); |
2301 | if (ret < 0) { | |
2302 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2303 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2304 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2305 | return ret; |
414c70cb LG |
2306 | } |
2307 | ||
66fda75f MP |
2308 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2309 | REGULATOR_EVENT_DISABLE, NULL); | |
2310 | ||
2311 | return 0; | |
414c70cb LG |
2312 | } |
2313 | ||
2314 | /** | |
2315 | * regulator_force_disable - force disable regulator output | |
2316 | * @regulator: regulator source | |
2317 | * | |
2318 | * Forcibly disable the regulator output voltage or current. | |
2319 | * NOTE: this *will* disable the regulator output even if other consumer | |
2320 | * devices have it enabled. This should be used for situations when device | |
2321 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2322 | */ | |
2323 | int regulator_force_disable(struct regulator *regulator) | |
2324 | { | |
82d15839 | 2325 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2326 | int ret; |
2327 | ||
82d15839 | 2328 | mutex_lock(&rdev->mutex); |
414c70cb | 2329 | regulator->uA_load = 0; |
3801b86a | 2330 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2331 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2332 | |
3801b86a MB |
2333 | if (rdev->supply) |
2334 | while (rdev->open_count--) | |
2335 | regulator_disable(rdev->supply); | |
8cbf811d | 2336 | |
414c70cb LG |
2337 | return ret; |
2338 | } | |
2339 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2340 | ||
da07ecd9 MB |
2341 | static void regulator_disable_work(struct work_struct *work) |
2342 | { | |
2343 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2344 | disable_work.work); | |
2345 | int count, i, ret; | |
2346 | ||
2347 | mutex_lock(&rdev->mutex); | |
2348 | ||
2349 | BUG_ON(!rdev->deferred_disables); | |
2350 | ||
2351 | count = rdev->deferred_disables; | |
2352 | rdev->deferred_disables = 0; | |
2353 | ||
2354 | for (i = 0; i < count; i++) { | |
2355 | ret = _regulator_disable(rdev); | |
2356 | if (ret != 0) | |
2357 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2358 | } | |
2359 | ||
2360 | mutex_unlock(&rdev->mutex); | |
2361 | ||
2362 | if (rdev->supply) { | |
2363 | for (i = 0; i < count; i++) { | |
2364 | ret = regulator_disable(rdev->supply); | |
2365 | if (ret != 0) { | |
2366 | rdev_err(rdev, | |
2367 | "Supply disable failed: %d\n", ret); | |
2368 | } | |
2369 | } | |
2370 | } | |
2371 | } | |
2372 | ||
2373 | /** | |
2374 | * regulator_disable_deferred - disable regulator output with delay | |
2375 | * @regulator: regulator source | |
2376 | * @ms: miliseconds until the regulator is disabled | |
2377 | * | |
2378 | * Execute regulator_disable() on the regulator after a delay. This | |
2379 | * is intended for use with devices that require some time to quiesce. | |
2380 | * | |
2381 | * NOTE: this will only disable the regulator output if no other consumer | |
2382 | * devices have it enabled, the regulator device supports disabling and | |
2383 | * machine constraints permit this operation. | |
2384 | */ | |
2385 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2386 | { | |
2387 | struct regulator_dev *rdev = regulator->rdev; | |
2388 | ||
6492bc1b MB |
2389 | if (regulator->always_on) |
2390 | return 0; | |
2391 | ||
2b5a24a0 MB |
2392 | if (!ms) |
2393 | return regulator_disable(regulator); | |
2394 | ||
da07ecd9 MB |
2395 | mutex_lock(&rdev->mutex); |
2396 | rdev->deferred_disables++; | |
2397 | mutex_unlock(&rdev->mutex); | |
2398 | ||
70dc6daf DC |
2399 | queue_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2400 | msecs_to_jiffies(ms)); | |
2401 | return 0; | |
da07ecd9 MB |
2402 | } |
2403 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2404 | ||
414c70cb LG |
2405 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2406 | { | |
65f73508 | 2407 | /* A GPIO control always takes precedence */ |
7b74d149 | 2408 | if (rdev->ena_pin) |
65f73508 MB |
2409 | return rdev->ena_gpio_state; |
2410 | ||
9a7f6a4c | 2411 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2412 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2413 | return 1; |
414c70cb | 2414 | |
9332546f | 2415 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2416 | } |
2417 | ||
3a40cfc3 SH |
2418 | static int _regulator_list_voltage(struct regulator *regulator, |
2419 | unsigned selector, int lock) | |
2420 | { | |
2421 | struct regulator_dev *rdev = regulator->rdev; | |
2422 | const struct regulator_ops *ops = rdev->desc->ops; | |
2423 | int ret; | |
2424 | ||
2425 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2426 | return rdev->desc->fixed_uV; | |
2427 | ||
2428 | if (ops->list_voltage) { | |
2429 | if (selector >= rdev->desc->n_voltages) | |
2430 | return -EINVAL; | |
2431 | if (lock) | |
2432 | mutex_lock(&rdev->mutex); | |
2433 | ret = ops->list_voltage(rdev, selector); | |
2434 | if (lock) | |
2435 | mutex_unlock(&rdev->mutex); | |
2436 | } else if (rdev->supply) { | |
2437 | ret = _regulator_list_voltage(rdev->supply, selector, lock); | |
2438 | } else { | |
2439 | return -EINVAL; | |
2440 | } | |
2441 | ||
2442 | if (ret > 0) { | |
2443 | if (ret < rdev->constraints->min_uV) | |
2444 | ret = 0; | |
2445 | else if (ret > rdev->constraints->max_uV) | |
2446 | ret = 0; | |
2447 | } | |
2448 | ||
2449 | return ret; | |
2450 | } | |
2451 | ||
414c70cb LG |
2452 | /** |
2453 | * regulator_is_enabled - is the regulator output enabled | |
2454 | * @regulator: regulator source | |
2455 | * | |
412aec61 DB |
2456 | * Returns positive if the regulator driver backing the source/client |
2457 | * has requested that the device be enabled, zero if it hasn't, else a | |
2458 | * negative errno code. | |
2459 | * | |
2460 | * Note that the device backing this regulator handle can have multiple | |
2461 | * users, so it might be enabled even if regulator_enable() was never | |
2462 | * called for this particular source. | |
414c70cb LG |
2463 | */ |
2464 | int regulator_is_enabled(struct regulator *regulator) | |
2465 | { | |
9332546f MB |
2466 | int ret; |
2467 | ||
6492bc1b MB |
2468 | if (regulator->always_on) |
2469 | return 1; | |
2470 | ||
9332546f MB |
2471 | mutex_lock(®ulator->rdev->mutex); |
2472 | ret = _regulator_is_enabled(regulator->rdev); | |
2473 | mutex_unlock(®ulator->rdev->mutex); | |
2474 | ||
2475 | return ret; | |
414c70cb LG |
2476 | } |
2477 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2478 | ||
d1e7de30 MS |
2479 | /** |
2480 | * regulator_can_change_voltage - check if regulator can change voltage | |
2481 | * @regulator: regulator source | |
2482 | * | |
2483 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2484 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2485 | * or dummy regulators and disabling voltage change logic in the client |
2486 | * driver. | |
2487 | */ | |
2488 | int regulator_can_change_voltage(struct regulator *regulator) | |
2489 | { | |
2490 | struct regulator_dev *rdev = regulator->rdev; | |
2491 | ||
2492 | if (rdev->constraints && | |
19280e40 AL |
2493 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2494 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2495 | return 1; | |
2496 | ||
2497 | if (rdev->desc->continuous_voltage_range && | |
2498 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2499 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2500 | return 1; | |
2501 | } | |
d1e7de30 MS |
2502 | |
2503 | return 0; | |
2504 | } | |
2505 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2506 | ||
4367cfdc DB |
2507 | /** |
2508 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2509 | * @regulator: regulator source | |
2510 | * | |
2511 | * Returns number of selectors, or negative errno. Selectors are | |
2512 | * numbered starting at zero, and typically correspond to bitfields | |
2513 | * in hardware registers. | |
2514 | */ | |
2515 | int regulator_count_voltages(struct regulator *regulator) | |
2516 | { | |
2517 | struct regulator_dev *rdev = regulator->rdev; | |
2518 | ||
26988efe JMC |
2519 | if (rdev->desc->n_voltages) |
2520 | return rdev->desc->n_voltages; | |
2521 | ||
2522 | if (!rdev->supply) | |
2523 | return -EINVAL; | |
2524 | ||
2525 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2526 | } |
2527 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2528 | ||
2529 | /** | |
2530 | * regulator_list_voltage - enumerate supported voltages | |
2531 | * @regulator: regulator source | |
2532 | * @selector: identify voltage to list | |
2533 | * Context: can sleep | |
2534 | * | |
2535 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2536 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2537 | * negative errno. |
2538 | */ | |
2539 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2540 | { | |
3a40cfc3 | 2541 | return _regulator_list_voltage(regulator, selector, 1); |
4367cfdc DB |
2542 | } |
2543 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2544 | ||
04eca28c TT |
2545 | /** |
2546 | * regulator_get_regmap - get the regulator's register map | |
2547 | * @regulator: regulator source | |
2548 | * | |
2549 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2550 | * if the regulator doesn't use regmap. | |
2551 | */ | |
2552 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2553 | { | |
2554 | struct regmap *map = regulator->rdev->regmap; | |
2555 | ||
2556 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2557 | } | |
2558 | ||
2559 | /** | |
2560 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2561 | * @regulator: regulator source | |
2562 | * @vsel_reg: voltage selector register, output parameter | |
2563 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2564 | * | |
2565 | * Returns the hardware register offset and bitmask used for setting the | |
2566 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2567 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2568 | * for example. | |
2569 | * | |
2570 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2571 | * and 0 is returned, otherwise a negative errno is returned. | |
2572 | */ | |
2573 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2574 | unsigned *vsel_reg, | |
2575 | unsigned *vsel_mask) | |
2576 | { | |
39f5460d GX |
2577 | struct regulator_dev *rdev = regulator->rdev; |
2578 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2579 | |
2580 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2581 | return -EOPNOTSUPP; | |
2582 | ||
2583 | *vsel_reg = rdev->desc->vsel_reg; | |
2584 | *vsel_mask = rdev->desc->vsel_mask; | |
2585 | ||
2586 | return 0; | |
2587 | } | |
2588 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2589 | ||
2590 | /** | |
2591 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2592 | * @regulator: regulator source | |
2593 | * @selector: identify voltage to list | |
2594 | * | |
2595 | * Converts the selector to a hardware-specific voltage selector that can be | |
2596 | * directly written to the regulator registers. The address of the voltage | |
2597 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2598 | * | |
2599 | * On error a negative errno is returned. | |
2600 | */ | |
2601 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2602 | unsigned selector) | |
2603 | { | |
39f5460d GX |
2604 | struct regulator_dev *rdev = regulator->rdev; |
2605 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2606 | |
2607 | if (selector >= rdev->desc->n_voltages) | |
2608 | return -EINVAL; | |
2609 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2610 | return -EOPNOTSUPP; | |
2611 | ||
2612 | return selector; | |
2613 | } | |
2614 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2615 | ||
2a668a8b PW |
2616 | /** |
2617 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2618 | * @regulator: regulator source | |
2619 | * | |
2620 | * Returns the voltage step size between VSEL values for linear | |
2621 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2622 | */ | |
2623 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2624 | { | |
2625 | struct regulator_dev *rdev = regulator->rdev; | |
2626 | ||
2627 | return rdev->desc->uV_step; | |
2628 | } | |
2629 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2630 | ||
a7a1ad90 MB |
2631 | /** |
2632 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2633 | * | |
2634 | * @regulator: Regulator to check. | |
2635 | * @min_uV: Minimum required voltage in uV. | |
2636 | * @max_uV: Maximum required voltage in uV. | |
2637 | * | |
2638 | * Returns a boolean or a negative error code. | |
2639 | */ | |
2640 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2641 | int min_uV, int max_uV) | |
2642 | { | |
c5f3939b | 2643 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2644 | int i, voltages, ret; |
2645 | ||
c5f3939b MB |
2646 | /* If we can't change voltage check the current voltage */ |
2647 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2648 | ret = regulator_get_voltage(regulator); | |
2649 | if (ret >= 0) | |
0d25d09d | 2650 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2651 | else |
2652 | return ret; | |
2653 | } | |
2654 | ||
bd7a2b60 PM |
2655 | /* Any voltage within constrains range is fine? */ |
2656 | if (rdev->desc->continuous_voltage_range) | |
2657 | return min_uV >= rdev->constraints->min_uV && | |
2658 | max_uV <= rdev->constraints->max_uV; | |
2659 | ||
a7a1ad90 MB |
2660 | ret = regulator_count_voltages(regulator); |
2661 | if (ret < 0) | |
2662 | return ret; | |
2663 | voltages = ret; | |
2664 | ||
2665 | for (i = 0; i < voltages; i++) { | |
2666 | ret = regulator_list_voltage(regulator, i); | |
2667 | ||
2668 | if (ret >= min_uV && ret <= max_uV) | |
2669 | return 1; | |
2670 | } | |
2671 | ||
2672 | return 0; | |
2673 | } | |
a398eaa2 | 2674 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2675 | |
a204f41e SH |
2676 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
2677 | int max_uV) | |
2678 | { | |
2679 | const struct regulator_desc *desc = rdev->desc; | |
2680 | ||
2681 | if (desc->ops->map_voltage) | |
2682 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
2683 | ||
2684 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
2685 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
2686 | ||
2687 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
2688 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
2689 | ||
2690 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); | |
2691 | } | |
2692 | ||
7179569a HS |
2693 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2694 | int min_uV, int max_uV, | |
2695 | unsigned *selector) | |
2696 | { | |
2697 | struct pre_voltage_change_data data; | |
2698 | int ret; | |
2699 | ||
2700 | data.old_uV = _regulator_get_voltage(rdev); | |
2701 | data.min_uV = min_uV; | |
2702 | data.max_uV = max_uV; | |
2703 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2704 | &data); | |
2705 | if (ret & NOTIFY_STOP_MASK) | |
2706 | return -EINVAL; | |
2707 | ||
2708 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2709 | if (ret >= 0) | |
2710 | return ret; | |
2711 | ||
2712 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2713 | (void *)data.old_uV); | |
2714 | ||
2715 | return ret; | |
2716 | } | |
2717 | ||
2718 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2719 | int uV, unsigned selector) | |
2720 | { | |
2721 | struct pre_voltage_change_data data; | |
2722 | int ret; | |
2723 | ||
2724 | data.old_uV = _regulator_get_voltage(rdev); | |
2725 | data.min_uV = uV; | |
2726 | data.max_uV = uV; | |
2727 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2728 | &data); | |
2729 | if (ret & NOTIFY_STOP_MASK) | |
2730 | return -EINVAL; | |
2731 | ||
2732 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2733 | if (ret >= 0) | |
2734 | return ret; | |
2735 | ||
2736 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2737 | (void *)data.old_uV); | |
2738 | ||
2739 | return ret; | |
2740 | } | |
2741 | ||
75790251 MB |
2742 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2743 | int min_uV, int max_uV) | |
2744 | { | |
2745 | int ret; | |
77af1b26 | 2746 | int delay = 0; |
e113d792 | 2747 | int best_val = 0; |
75790251 | 2748 | unsigned int selector; |
eba41a5e | 2749 | int old_selector = -1; |
75790251 MB |
2750 | |
2751 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2752 | ||
bf5892a8 MB |
2753 | min_uV += rdev->constraints->uV_offset; |
2754 | max_uV += rdev->constraints->uV_offset; | |
2755 | ||
eba41a5e AL |
2756 | /* |
2757 | * If we can't obtain the old selector there is not enough | |
2758 | * info to call set_voltage_time_sel(). | |
2759 | */ | |
8b7485ef AL |
2760 | if (_regulator_is_enabled(rdev) && |
2761 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2762 | rdev->desc->ops->get_voltage_sel) { |
2763 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2764 | if (old_selector < 0) | |
2765 | return old_selector; | |
2766 | } | |
2767 | ||
75790251 | 2768 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2769 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2770 | &selector); | |
e113d792 MB |
2771 | |
2772 | if (ret >= 0) { | |
2773 | if (rdev->desc->ops->list_voltage) | |
2774 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2775 | selector); | |
2776 | else | |
2777 | best_val = _regulator_get_voltage(rdev); | |
2778 | } | |
2779 | ||
e8eef82b | 2780 | } else if (rdev->desc->ops->set_voltage_sel) { |
a204f41e | 2781 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 2782 | if (ret >= 0) { |
e113d792 MB |
2783 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2784 | if (min_uV <= best_val && max_uV >= best_val) { | |
2785 | selector = ret; | |
c66a566a AL |
2786 | if (old_selector == selector) |
2787 | ret = 0; | |
2788 | else | |
7179569a HS |
2789 | ret = _regulator_call_set_voltage_sel( |
2790 | rdev, best_val, selector); | |
e113d792 MB |
2791 | } else { |
2792 | ret = -EINVAL; | |
2793 | } | |
e8eef82b | 2794 | } |
75790251 MB |
2795 | } else { |
2796 | ret = -EINVAL; | |
2797 | } | |
e8eef82b | 2798 | |
eba41a5e | 2799 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2800 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2801 | && old_selector != selector) { | |
77af1b26 | 2802 | |
eba41a5e AL |
2803 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2804 | old_selector, selector); | |
2805 | if (delay < 0) { | |
2806 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2807 | delay); | |
2808 | delay = 0; | |
e8eef82b | 2809 | } |
75790251 | 2810 | |
8b96de31 PR |
2811 | /* Insert any necessary delays */ |
2812 | if (delay >= 1000) { | |
2813 | mdelay(delay / 1000); | |
2814 | udelay(delay % 1000); | |
2815 | } else if (delay) { | |
2816 | udelay(delay); | |
2817 | } | |
77af1b26 LW |
2818 | } |
2819 | ||
2f6c797f AL |
2820 | if (ret == 0 && best_val >= 0) { |
2821 | unsigned long data = best_val; | |
2822 | ||
ded06a52 | 2823 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2824 | (void *)data); |
2825 | } | |
ded06a52 | 2826 | |
eba41a5e | 2827 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2828 | |
2829 | return ret; | |
2830 | } | |
2831 | ||
a9f226bc SH |
2832 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
2833 | int min_uV, int max_uV) | |
414c70cb LG |
2834 | { |
2835 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2836 | int ret = 0; |
92d7a558 | 2837 | int old_min_uV, old_max_uV; |
c00dc359 | 2838 | int current_uV; |
fc42112c SH |
2839 | int best_supply_uV = 0; |
2840 | int supply_change_uV = 0; | |
414c70cb | 2841 | |
95a3c23a MB |
2842 | /* If we're setting the same range as last time the change |
2843 | * should be a noop (some cpufreq implementations use the same | |
2844 | * voltage for multiple frequencies, for example). | |
2845 | */ | |
2846 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2847 | goto out; | |
2848 | ||
c00dc359 | 2849 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 2850 | * return successfully even though the regulator does not support |
c00dc359 BA |
2851 | * changing the voltage. |
2852 | */ | |
2853 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2854 | current_uV = _regulator_get_voltage(rdev); | |
2855 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2856 | regulator->min_uV = min_uV; | |
2857 | regulator->max_uV = max_uV; | |
2858 | goto out; | |
2859 | } | |
2860 | } | |
2861 | ||
414c70cb | 2862 | /* sanity check */ |
e8eef82b MB |
2863 | if (!rdev->desc->ops->set_voltage && |
2864 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2865 | ret = -EINVAL; |
2866 | goto out; | |
2867 | } | |
2868 | ||
2869 | /* constraints check */ | |
2870 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2871 | if (ret < 0) | |
2872 | goto out; | |
0d25d09d | 2873 | |
92d7a558 PP |
2874 | /* restore original values in case of error */ |
2875 | old_min_uV = regulator->min_uV; | |
2876 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2877 | regulator->min_uV = min_uV; |
2878 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2879 | |
05fda3b1 TP |
2880 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2881 | if (ret < 0) | |
92d7a558 | 2882 | goto out2; |
05fda3b1 | 2883 | |
fc42112c SH |
2884 | if (rdev->supply && (rdev->desc->min_dropout_uV || |
2885 | !rdev->desc->ops->get_voltage)) { | |
2886 | int current_supply_uV; | |
2887 | int selector; | |
2888 | ||
2889 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
2890 | if (selector < 0) { | |
2891 | ret = selector; | |
2892 | goto out2; | |
2893 | } | |
2894 | ||
2895 | best_supply_uV = _regulator_list_voltage(regulator, selector, 0); | |
2896 | if (best_supply_uV < 0) { | |
2897 | ret = best_supply_uV; | |
2898 | goto out2; | |
2899 | } | |
2900 | ||
2901 | best_supply_uV += rdev->desc->min_dropout_uV; | |
2902 | ||
2903 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
2904 | if (current_supply_uV < 0) { | |
2905 | ret = current_supply_uV; | |
2906 | goto out2; | |
2907 | } | |
2908 | ||
2909 | supply_change_uV = best_supply_uV - current_supply_uV; | |
2910 | } | |
2911 | ||
2912 | if (supply_change_uV > 0) { | |
2913 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
2914 | best_supply_uV, INT_MAX); | |
2915 | if (ret) { | |
2916 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
2917 | ret); | |
2918 | goto out2; | |
2919 | } | |
2920 | } | |
2921 | ||
75790251 | 2922 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2923 | if (ret < 0) |
2924 | goto out2; | |
0d25d09d | 2925 | |
fc42112c SH |
2926 | if (supply_change_uV < 0) { |
2927 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
2928 | best_supply_uV, INT_MAX); | |
2929 | if (ret) | |
2930 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
2931 | ret); | |
2932 | /* No need to fail here */ | |
2933 | ret = 0; | |
2934 | } | |
2935 | ||
414c70cb | 2936 | out: |
414c70cb | 2937 | return ret; |
92d7a558 PP |
2938 | out2: |
2939 | regulator->min_uV = old_min_uV; | |
2940 | regulator->max_uV = old_max_uV; | |
a9f226bc SH |
2941 | |
2942 | return ret; | |
2943 | } | |
2944 | ||
2945 | /** | |
2946 | * regulator_set_voltage - set regulator output voltage | |
2947 | * @regulator: regulator source | |
2948 | * @min_uV: Minimum required voltage in uV | |
2949 | * @max_uV: Maximum acceptable voltage in uV | |
2950 | * | |
2951 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2952 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2953 | * | |
2954 | * If the regulator is enabled then the voltage will change to the new value | |
2955 | * immediately otherwise if the regulator is disabled the regulator will | |
2956 | * output at the new voltage when enabled. | |
2957 | * | |
2958 | * NOTE: If the regulator is shared between several devices then the lowest | |
2959 | * request voltage that meets the system constraints will be used. | |
2960 | * Regulator system constraints must be set for this regulator before | |
2961 | * calling this function otherwise this call will fail. | |
2962 | */ | |
2963 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2964 | { | |
2965 | int ret = 0; | |
2966 | ||
fc42112c | 2967 | regulator_lock_supply(regulator->rdev); |
a9f226bc SH |
2968 | |
2969 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV); | |
2970 | ||
fc42112c | 2971 | regulator_unlock_supply(regulator->rdev); |
a9f226bc | 2972 | |
414c70cb LG |
2973 | return ret; |
2974 | } | |
2975 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2976 | ||
88cd222b LW |
2977 | /** |
2978 | * regulator_set_voltage_time - get raise/fall time | |
2979 | * @regulator: regulator source | |
2980 | * @old_uV: starting voltage in microvolts | |
2981 | * @new_uV: target voltage in microvolts | |
2982 | * | |
2983 | * Provided with the starting and ending voltage, this function attempts to | |
2984 | * calculate the time in microseconds required to rise or fall to this new | |
2985 | * voltage. | |
2986 | */ | |
2987 | int regulator_set_voltage_time(struct regulator *regulator, | |
2988 | int old_uV, int new_uV) | |
2989 | { | |
272e2315 GX |
2990 | struct regulator_dev *rdev = regulator->rdev; |
2991 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
2992 | int old_sel = -1; |
2993 | int new_sel = -1; | |
2994 | int voltage; | |
2995 | int i; | |
2996 | ||
2997 | /* Currently requires operations to do this */ | |
2998 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2999 | || !rdev->desc->n_voltages) | |
3000 | return -EINVAL; | |
3001 | ||
3002 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3003 | /* We only look for exact voltage matches here */ | |
3004 | voltage = regulator_list_voltage(regulator, i); | |
3005 | if (voltage < 0) | |
3006 | return -EINVAL; | |
3007 | if (voltage == 0) | |
3008 | continue; | |
3009 | if (voltage == old_uV) | |
3010 | old_sel = i; | |
3011 | if (voltage == new_uV) | |
3012 | new_sel = i; | |
3013 | } | |
3014 | ||
3015 | if (old_sel < 0 || new_sel < 0) | |
3016 | return -EINVAL; | |
3017 | ||
3018 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3019 | } | |
3020 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3021 | ||
98a175b6 | 3022 | /** |
296c6566 RD |
3023 | * regulator_set_voltage_time_sel - get raise/fall time |
3024 | * @rdev: regulator source device | |
98a175b6 YSB |
3025 | * @old_selector: selector for starting voltage |
3026 | * @new_selector: selector for target voltage | |
3027 | * | |
3028 | * Provided with the starting and target voltage selectors, this function | |
3029 | * returns time in microseconds required to rise or fall to this new voltage | |
3030 | * | |
f11d08c3 | 3031 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3032 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3033 | */ |
3034 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3035 | unsigned int old_selector, | |
3036 | unsigned int new_selector) | |
3037 | { | |
398715ab | 3038 | unsigned int ramp_delay = 0; |
f11d08c3 | 3039 | int old_volt, new_volt; |
398715ab AL |
3040 | |
3041 | if (rdev->constraints->ramp_delay) | |
3042 | ramp_delay = rdev->constraints->ramp_delay; | |
3043 | else if (rdev->desc->ramp_delay) | |
3044 | ramp_delay = rdev->desc->ramp_delay; | |
3045 | ||
3046 | if (ramp_delay == 0) { | |
6f0b2c69 | 3047 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 3048 | return 0; |
6f0b2c69 | 3049 | } |
398715ab | 3050 | |
f11d08c3 AL |
3051 | /* sanity check */ |
3052 | if (!rdev->desc->ops->list_voltage) | |
3053 | return -EINVAL; | |
398715ab | 3054 | |
f11d08c3 AL |
3055 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3056 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3057 | ||
3058 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 3059 | } |
b19dbf71 | 3060 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3061 | |
606a2562 MB |
3062 | /** |
3063 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3064 | * @regulator: regulator source | |
3065 | * | |
3066 | * Re-apply the last configured voltage. This is intended to be used | |
3067 | * where some external control source the consumer is cooperating with | |
3068 | * has caused the configured voltage to change. | |
3069 | */ | |
3070 | int regulator_sync_voltage(struct regulator *regulator) | |
3071 | { | |
3072 | struct regulator_dev *rdev = regulator->rdev; | |
3073 | int ret, min_uV, max_uV; | |
3074 | ||
3075 | mutex_lock(&rdev->mutex); | |
3076 | ||
3077 | if (!rdev->desc->ops->set_voltage && | |
3078 | !rdev->desc->ops->set_voltage_sel) { | |
3079 | ret = -EINVAL; | |
3080 | goto out; | |
3081 | } | |
3082 | ||
3083 | /* This is only going to work if we've had a voltage configured. */ | |
3084 | if (!regulator->min_uV && !regulator->max_uV) { | |
3085 | ret = -EINVAL; | |
3086 | goto out; | |
3087 | } | |
3088 | ||
3089 | min_uV = regulator->min_uV; | |
3090 | max_uV = regulator->max_uV; | |
3091 | ||
3092 | /* This should be a paranoia check... */ | |
3093 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3094 | if (ret < 0) | |
3095 | goto out; | |
3096 | ||
3097 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
3098 | if (ret < 0) | |
3099 | goto out; | |
3100 | ||
3101 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3102 | ||
3103 | out: | |
3104 | mutex_unlock(&rdev->mutex); | |
3105 | return ret; | |
3106 | } | |
3107 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3108 | ||
414c70cb LG |
3109 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3110 | { | |
bf5892a8 | 3111 | int sel, ret; |
476c2d83 MB |
3112 | |
3113 | if (rdev->desc->ops->get_voltage_sel) { | |
3114 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3115 | if (sel < 0) | |
3116 | return sel; | |
bf5892a8 | 3117 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3118 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3119 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3120 | } else if (rdev->desc->ops->list_voltage) { |
3121 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3122 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3123 | ret = rdev->desc->fixed_uV; | |
e303996e | 3124 | } else if (rdev->supply) { |
d9b96d35 | 3125 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3126 | } else { |
414c70cb | 3127 | return -EINVAL; |
cb220d16 | 3128 | } |
bf5892a8 | 3129 | |
cb220d16 AL |
3130 | if (ret < 0) |
3131 | return ret; | |
bf5892a8 | 3132 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3133 | } |
3134 | ||
3135 | /** | |
3136 | * regulator_get_voltage - get regulator output voltage | |
3137 | * @regulator: regulator source | |
3138 | * | |
3139 | * This returns the current regulator voltage in uV. | |
3140 | * | |
3141 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
3142 | * function should not be used to determine regulator state. | |
3143 | */ | |
3144 | int regulator_get_voltage(struct regulator *regulator) | |
3145 | { | |
3146 | int ret; | |
3147 | ||
d9b96d35 | 3148 | regulator_lock_supply(regulator->rdev); |
414c70cb LG |
3149 | |
3150 | ret = _regulator_get_voltage(regulator->rdev); | |
3151 | ||
d9b96d35 | 3152 | regulator_unlock_supply(regulator->rdev); |
414c70cb LG |
3153 | |
3154 | return ret; | |
3155 | } | |
3156 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
3157 | ||
3158 | /** | |
3159 | * regulator_set_current_limit - set regulator output current limit | |
3160 | * @regulator: regulator source | |
ce0d10f8 | 3161 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
3162 | * @max_uA: Maximum supported current in uA |
3163 | * | |
3164 | * Sets current sink to the desired output current. This can be set during | |
3165 | * any regulator state. IOW, regulator can be disabled or enabled. | |
3166 | * | |
3167 | * If the regulator is enabled then the current will change to the new value | |
3168 | * immediately otherwise if the regulator is disabled the regulator will | |
3169 | * output at the new current when enabled. | |
3170 | * | |
3171 | * NOTE: Regulator system constraints must be set for this regulator before | |
3172 | * calling this function otherwise this call will fail. | |
3173 | */ | |
3174 | int regulator_set_current_limit(struct regulator *regulator, | |
3175 | int min_uA, int max_uA) | |
3176 | { | |
3177 | struct regulator_dev *rdev = regulator->rdev; | |
3178 | int ret; | |
3179 | ||
3180 | mutex_lock(&rdev->mutex); | |
3181 | ||
3182 | /* sanity check */ | |
3183 | if (!rdev->desc->ops->set_current_limit) { | |
3184 | ret = -EINVAL; | |
3185 | goto out; | |
3186 | } | |
3187 | ||
3188 | /* constraints check */ | |
3189 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
3190 | if (ret < 0) | |
3191 | goto out; | |
3192 | ||
3193 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
3194 | out: | |
3195 | mutex_unlock(&rdev->mutex); | |
3196 | return ret; | |
3197 | } | |
3198 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
3199 | ||
3200 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
3201 | { | |
3202 | int ret; | |
3203 | ||
3204 | mutex_lock(&rdev->mutex); | |
3205 | ||
3206 | /* sanity check */ | |
3207 | if (!rdev->desc->ops->get_current_limit) { | |
3208 | ret = -EINVAL; | |
3209 | goto out; | |
3210 | } | |
3211 | ||
3212 | ret = rdev->desc->ops->get_current_limit(rdev); | |
3213 | out: | |
3214 | mutex_unlock(&rdev->mutex); | |
3215 | return ret; | |
3216 | } | |
3217 | ||
3218 | /** | |
3219 | * regulator_get_current_limit - get regulator output current | |
3220 | * @regulator: regulator source | |
3221 | * | |
3222 | * This returns the current supplied by the specified current sink in uA. | |
3223 | * | |
3224 | * NOTE: If the regulator is disabled it will return the current value. This | |
3225 | * function should not be used to determine regulator state. | |
3226 | */ | |
3227 | int regulator_get_current_limit(struct regulator *regulator) | |
3228 | { | |
3229 | return _regulator_get_current_limit(regulator->rdev); | |
3230 | } | |
3231 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
3232 | ||
3233 | /** | |
3234 | * regulator_set_mode - set regulator operating mode | |
3235 | * @regulator: regulator source | |
3236 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
3237 | * | |
3238 | * Set regulator operating mode to increase regulator efficiency or improve | |
3239 | * regulation performance. | |
3240 | * | |
3241 | * NOTE: Regulator system constraints must be set for this regulator before | |
3242 | * calling this function otherwise this call will fail. | |
3243 | */ | |
3244 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3245 | { | |
3246 | struct regulator_dev *rdev = regulator->rdev; | |
3247 | int ret; | |
500b4ac9 | 3248 | int regulator_curr_mode; |
414c70cb LG |
3249 | |
3250 | mutex_lock(&rdev->mutex); | |
3251 | ||
3252 | /* sanity check */ | |
3253 | if (!rdev->desc->ops->set_mode) { | |
3254 | ret = -EINVAL; | |
3255 | goto out; | |
3256 | } | |
3257 | ||
500b4ac9 SI |
3258 | /* return if the same mode is requested */ |
3259 | if (rdev->desc->ops->get_mode) { | |
3260 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3261 | if (regulator_curr_mode == mode) { | |
3262 | ret = 0; | |
3263 | goto out; | |
3264 | } | |
3265 | } | |
3266 | ||
414c70cb | 3267 | /* constraints check */ |
22c51b47 | 3268 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3269 | if (ret < 0) |
3270 | goto out; | |
3271 | ||
3272 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3273 | out: | |
3274 | mutex_unlock(&rdev->mutex); | |
3275 | return ret; | |
3276 | } | |
3277 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3278 | ||
3279 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3280 | { | |
3281 | int ret; | |
3282 | ||
3283 | mutex_lock(&rdev->mutex); | |
3284 | ||
3285 | /* sanity check */ | |
3286 | if (!rdev->desc->ops->get_mode) { | |
3287 | ret = -EINVAL; | |
3288 | goto out; | |
3289 | } | |
3290 | ||
3291 | ret = rdev->desc->ops->get_mode(rdev); | |
3292 | out: | |
3293 | mutex_unlock(&rdev->mutex); | |
3294 | return ret; | |
3295 | } | |
3296 | ||
3297 | /** | |
3298 | * regulator_get_mode - get regulator operating mode | |
3299 | * @regulator: regulator source | |
3300 | * | |
3301 | * Get the current regulator operating mode. | |
3302 | */ | |
3303 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3304 | { | |
3305 | return _regulator_get_mode(regulator->rdev); | |
3306 | } | |
3307 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3308 | ||
3309 | /** | |
e39ce48f | 3310 | * regulator_set_load - set regulator load |
414c70cb LG |
3311 | * @regulator: regulator source |
3312 | * @uA_load: load current | |
3313 | * | |
3314 | * Notifies the regulator core of a new device load. This is then used by | |
3315 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3316 | * operating mode for the new regulator loading. | |
3317 | * | |
3318 | * Consumer devices notify their supply regulator of the maximum power | |
3319 | * they will require (can be taken from device datasheet in the power | |
3320 | * consumption tables) when they change operational status and hence power | |
3321 | * state. Examples of operational state changes that can affect power | |
3322 | * consumption are :- | |
3323 | * | |
3324 | * o Device is opened / closed. | |
3325 | * o Device I/O is about to begin or has just finished. | |
3326 | * o Device is idling in between work. | |
3327 | * | |
3328 | * This information is also exported via sysfs to userspace. | |
3329 | * | |
3330 | * DRMS will sum the total requested load on the regulator and change | |
3331 | * to the most efficient operating mode if platform constraints allow. | |
3332 | * | |
e39ce48f | 3333 | * On error a negative errno is returned. |
414c70cb | 3334 | */ |
e39ce48f | 3335 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3336 | { |
3337 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3338 | int ret; |
d92d95b6 | 3339 | |
414c70cb | 3340 | mutex_lock(&rdev->mutex); |
414c70cb | 3341 | regulator->uA_load = uA_load; |
8460ef38 | 3342 | ret = drms_uA_update(rdev); |
414c70cb | 3343 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3344 | |
414c70cb LG |
3345 | return ret; |
3346 | } | |
e39ce48f | 3347 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3348 | |
f59c8f9f MB |
3349 | /** |
3350 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3351 | * | |
3352 | * @regulator: Regulator to configure | |
9345dfb8 | 3353 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3354 | * |
3355 | * Allow the regulator to go into bypass mode if all other consumers | |
3356 | * for the regulator also enable bypass mode and the machine | |
3357 | * constraints allow this. Bypass mode means that the regulator is | |
3358 | * simply passing the input directly to the output with no regulation. | |
3359 | */ | |
3360 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3361 | { | |
3362 | struct regulator_dev *rdev = regulator->rdev; | |
3363 | int ret = 0; | |
3364 | ||
3365 | if (!rdev->desc->ops->set_bypass) | |
3366 | return 0; | |
3367 | ||
3368 | if (rdev->constraints && | |
3369 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
3370 | return 0; | |
3371 | ||
3372 | mutex_lock(&rdev->mutex); | |
3373 | ||
3374 | if (enable && !regulator->bypass) { | |
3375 | rdev->bypass_count++; | |
3376 | ||
3377 | if (rdev->bypass_count == rdev->open_count) { | |
3378 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3379 | if (ret != 0) | |
3380 | rdev->bypass_count--; | |
3381 | } | |
3382 | ||
3383 | } else if (!enable && regulator->bypass) { | |
3384 | rdev->bypass_count--; | |
3385 | ||
3386 | if (rdev->bypass_count != rdev->open_count) { | |
3387 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3388 | if (ret != 0) | |
3389 | rdev->bypass_count++; | |
3390 | } | |
3391 | } | |
3392 | ||
3393 | if (ret == 0) | |
3394 | regulator->bypass = enable; | |
3395 | ||
3396 | mutex_unlock(&rdev->mutex); | |
3397 | ||
3398 | return ret; | |
3399 | } | |
3400 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3401 | ||
414c70cb LG |
3402 | /** |
3403 | * regulator_register_notifier - register regulator event notifier | |
3404 | * @regulator: regulator source | |
69279fb9 | 3405 | * @nb: notifier block |
414c70cb LG |
3406 | * |
3407 | * Register notifier block to receive regulator events. | |
3408 | */ | |
3409 | int regulator_register_notifier(struct regulator *regulator, | |
3410 | struct notifier_block *nb) | |
3411 | { | |
3412 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3413 | nb); | |
3414 | } | |
3415 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3416 | ||
3417 | /** | |
3418 | * regulator_unregister_notifier - unregister regulator event notifier | |
3419 | * @regulator: regulator source | |
69279fb9 | 3420 | * @nb: notifier block |
414c70cb LG |
3421 | * |
3422 | * Unregister regulator event notifier block. | |
3423 | */ | |
3424 | int regulator_unregister_notifier(struct regulator *regulator, | |
3425 | struct notifier_block *nb) | |
3426 | { | |
3427 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3428 | nb); | |
3429 | } | |
3430 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3431 | ||
b136fb44 JC |
3432 | /* notify regulator consumers and downstream regulator consumers. |
3433 | * Note mutex must be held by caller. | |
3434 | */ | |
7179569a | 3435 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3436 | unsigned long event, void *data) |
3437 | { | |
414c70cb | 3438 | /* call rdev chain first */ |
7179569a | 3439 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3440 | } |
3441 | ||
3442 | /** | |
3443 | * regulator_bulk_get - get multiple regulator consumers | |
3444 | * | |
3445 | * @dev: Device to supply | |
3446 | * @num_consumers: Number of consumers to register | |
3447 | * @consumers: Configuration of consumers; clients are stored here. | |
3448 | * | |
3449 | * @return 0 on success, an errno on failure. | |
3450 | * | |
3451 | * This helper function allows drivers to get several regulator | |
3452 | * consumers in one operation. If any of the regulators cannot be | |
3453 | * acquired then any regulators that were allocated will be freed | |
3454 | * before returning to the caller. | |
3455 | */ | |
3456 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3457 | struct regulator_bulk_data *consumers) | |
3458 | { | |
3459 | int i; | |
3460 | int ret; | |
3461 | ||
3462 | for (i = 0; i < num_consumers; i++) | |
3463 | consumers[i].consumer = NULL; | |
3464 | ||
3465 | for (i = 0; i < num_consumers; i++) { | |
3ff3f518 BA |
3466 | consumers[i].consumer = _regulator_get(dev, |
3467 | consumers[i].supply, | |
3468 | false, | |
3469 | !consumers[i].optional); | |
414c70cb | 3470 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 3471 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3472 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3473 | consumers[i].supply, ret); | |
414c70cb LG |
3474 | consumers[i].consumer = NULL; |
3475 | goto err; | |
3476 | } | |
3477 | } | |
3478 | ||
3479 | return 0; | |
3480 | ||
3481 | err: | |
b29c7690 | 3482 | while (--i >= 0) |
414c70cb LG |
3483 | regulator_put(consumers[i].consumer); |
3484 | ||
3485 | return ret; | |
3486 | } | |
3487 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3488 | ||
f21e0e81 MB |
3489 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3490 | { | |
3491 | struct regulator_bulk_data *bulk = data; | |
3492 | ||
3493 | bulk->ret = regulator_enable(bulk->consumer); | |
3494 | } | |
3495 | ||
414c70cb LG |
3496 | /** |
3497 | * regulator_bulk_enable - enable multiple regulator consumers | |
3498 | * | |
3499 | * @num_consumers: Number of consumers | |
3500 | * @consumers: Consumer data; clients are stored here. | |
3501 | * @return 0 on success, an errno on failure | |
3502 | * | |
3503 | * This convenience API allows consumers to enable multiple regulator | |
3504 | * clients in a single API call. If any consumers cannot be enabled | |
3505 | * then any others that were enabled will be disabled again prior to | |
3506 | * return. | |
3507 | */ | |
3508 | int regulator_bulk_enable(int num_consumers, | |
3509 | struct regulator_bulk_data *consumers) | |
3510 | { | |
2955b47d | 3511 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3512 | int i; |
f21e0e81 | 3513 | int ret = 0; |
414c70cb | 3514 | |
6492bc1b MB |
3515 | for (i = 0; i < num_consumers; i++) { |
3516 | if (consumers[i].consumer->always_on) | |
3517 | consumers[i].ret = 0; | |
3518 | else | |
3519 | async_schedule_domain(regulator_bulk_enable_async, | |
3520 | &consumers[i], &async_domain); | |
3521 | } | |
f21e0e81 MB |
3522 | |
3523 | async_synchronize_full_domain(&async_domain); | |
3524 | ||
3525 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3526 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3527 | if (consumers[i].ret != 0) { |
3528 | ret = consumers[i].ret; | |
414c70cb | 3529 | goto err; |
f21e0e81 | 3530 | } |
414c70cb LG |
3531 | } |
3532 | ||
3533 | return 0; | |
3534 | ||
3535 | err: | |
fbe31057 AH |
3536 | for (i = 0; i < num_consumers; i++) { |
3537 | if (consumers[i].ret < 0) | |
3538 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3539 | consumers[i].ret); | |
3540 | else | |
3541 | regulator_disable(consumers[i].consumer); | |
3542 | } | |
414c70cb LG |
3543 | |
3544 | return ret; | |
3545 | } | |
3546 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3547 | ||
3548 | /** | |
3549 | * regulator_bulk_disable - disable multiple regulator consumers | |
3550 | * | |
3551 | * @num_consumers: Number of consumers | |
3552 | * @consumers: Consumer data; clients are stored here. | |
3553 | * @return 0 on success, an errno on failure | |
3554 | * | |
3555 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3556 | * clients in a single API call. If any consumers cannot be disabled |
3557 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3558 | * return. |
3559 | */ | |
3560 | int regulator_bulk_disable(int num_consumers, | |
3561 | struct regulator_bulk_data *consumers) | |
3562 | { | |
3563 | int i; | |
01e86f49 | 3564 | int ret, r; |
414c70cb | 3565 | |
49e22632 | 3566 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3567 | ret = regulator_disable(consumers[i].consumer); |
3568 | if (ret != 0) | |
3569 | goto err; | |
3570 | } | |
3571 | ||
3572 | return 0; | |
3573 | ||
3574 | err: | |
5da84fd9 | 3575 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3576 | for (++i; i < num_consumers; ++i) { |
3577 | r = regulator_enable(consumers[i].consumer); | |
3578 | if (r != 0) | |
3579 | pr_err("Failed to reename %s: %d\n", | |
3580 | consumers[i].supply, r); | |
3581 | } | |
414c70cb LG |
3582 | |
3583 | return ret; | |
3584 | } | |
3585 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3586 | ||
e1de2f42 DK |
3587 | /** |
3588 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3589 | * | |
3590 | * @num_consumers: Number of consumers | |
3591 | * @consumers: Consumer data; clients are stored here. | |
3592 | * @return 0 on success, an errno on failure | |
3593 | * | |
3594 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3595 | * clients in a single API call. | |
3596 | * NOTE: This should be used for situations when device damage will | |
3597 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3598 | * Although regulator_force_disable function call for some consumers can | |
3599 | * return error numbers, the function is called for all consumers. | |
3600 | */ | |
3601 | int regulator_bulk_force_disable(int num_consumers, | |
3602 | struct regulator_bulk_data *consumers) | |
3603 | { | |
3604 | int i; | |
3605 | int ret; | |
3606 | ||
3607 | for (i = 0; i < num_consumers; i++) | |
3608 | consumers[i].ret = | |
3609 | regulator_force_disable(consumers[i].consumer); | |
3610 | ||
3611 | for (i = 0; i < num_consumers; i++) { | |
3612 | if (consumers[i].ret != 0) { | |
3613 | ret = consumers[i].ret; | |
3614 | goto out; | |
3615 | } | |
3616 | } | |
3617 | ||
3618 | return 0; | |
3619 | out: | |
3620 | return ret; | |
3621 | } | |
3622 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3623 | ||
414c70cb LG |
3624 | /** |
3625 | * regulator_bulk_free - free multiple regulator consumers | |
3626 | * | |
3627 | * @num_consumers: Number of consumers | |
3628 | * @consumers: Consumer data; clients are stored here. | |
3629 | * | |
3630 | * This convenience API allows consumers to free multiple regulator | |
3631 | * clients in a single API call. | |
3632 | */ | |
3633 | void regulator_bulk_free(int num_consumers, | |
3634 | struct regulator_bulk_data *consumers) | |
3635 | { | |
3636 | int i; | |
3637 | ||
3638 | for (i = 0; i < num_consumers; i++) { | |
3639 | regulator_put(consumers[i].consumer); | |
3640 | consumers[i].consumer = NULL; | |
3641 | } | |
3642 | } | |
3643 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3644 | ||
3645 | /** | |
3646 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3647 | * @rdev: regulator source |
414c70cb | 3648 | * @event: notifier block |
69279fb9 | 3649 | * @data: callback-specific data. |
414c70cb LG |
3650 | * |
3651 | * Called by regulator drivers to notify clients a regulator event has | |
3652 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3653 | * Note lock must be held by caller. |
414c70cb LG |
3654 | */ |
3655 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3656 | unsigned long event, void *data) | |
3657 | { | |
70cfef26 KK |
3658 | lockdep_assert_held_once(&rdev->mutex); |
3659 | ||
414c70cb LG |
3660 | _notifier_call_chain(rdev, event, data); |
3661 | return NOTIFY_DONE; | |
3662 | ||
3663 | } | |
3664 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3665 | ||
be721979 MB |
3666 | /** |
3667 | * regulator_mode_to_status - convert a regulator mode into a status | |
3668 | * | |
3669 | * @mode: Mode to convert | |
3670 | * | |
3671 | * Convert a regulator mode into a status. | |
3672 | */ | |
3673 | int regulator_mode_to_status(unsigned int mode) | |
3674 | { | |
3675 | switch (mode) { | |
3676 | case REGULATOR_MODE_FAST: | |
3677 | return REGULATOR_STATUS_FAST; | |
3678 | case REGULATOR_MODE_NORMAL: | |
3679 | return REGULATOR_STATUS_NORMAL; | |
3680 | case REGULATOR_MODE_IDLE: | |
3681 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3682 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3683 | return REGULATOR_STATUS_STANDBY; |
3684 | default: | |
1beaf762 | 3685 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3686 | } |
3687 | } | |
3688 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3689 | ||
39f802d6 TI |
3690 | static struct attribute *regulator_dev_attrs[] = { |
3691 | &dev_attr_name.attr, | |
3692 | &dev_attr_num_users.attr, | |
3693 | &dev_attr_type.attr, | |
3694 | &dev_attr_microvolts.attr, | |
3695 | &dev_attr_microamps.attr, | |
3696 | &dev_attr_opmode.attr, | |
3697 | &dev_attr_state.attr, | |
3698 | &dev_attr_status.attr, | |
3699 | &dev_attr_bypass.attr, | |
3700 | &dev_attr_requested_microamps.attr, | |
3701 | &dev_attr_min_microvolts.attr, | |
3702 | &dev_attr_max_microvolts.attr, | |
3703 | &dev_attr_min_microamps.attr, | |
3704 | &dev_attr_max_microamps.attr, | |
3705 | &dev_attr_suspend_standby_state.attr, | |
3706 | &dev_attr_suspend_mem_state.attr, | |
3707 | &dev_attr_suspend_disk_state.attr, | |
3708 | &dev_attr_suspend_standby_microvolts.attr, | |
3709 | &dev_attr_suspend_mem_microvolts.attr, | |
3710 | &dev_attr_suspend_disk_microvolts.attr, | |
3711 | &dev_attr_suspend_standby_mode.attr, | |
3712 | &dev_attr_suspend_mem_mode.attr, | |
3713 | &dev_attr_suspend_disk_mode.attr, | |
3714 | NULL | |
3715 | }; | |
3716 | ||
7ad68e2f DB |
3717 | /* |
3718 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3719 | * create attributes that can be meaningfully displayed. | |
3720 | */ | |
39f802d6 TI |
3721 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3722 | struct attribute *attr, int idx) | |
7ad68e2f | 3723 | { |
39f802d6 | 3724 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 3725 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 3726 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3727 | umode_t mode = attr->mode; |
3728 | ||
3729 | /* these three are always present */ | |
3730 | if (attr == &dev_attr_name.attr || | |
3731 | attr == &dev_attr_num_users.attr || | |
3732 | attr == &dev_attr_type.attr) | |
3733 | return mode; | |
7ad68e2f DB |
3734 | |
3735 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3736 | if (attr == &dev_attr_microvolts.attr) { |
3737 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3738 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3739 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3740 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3741 | return mode; | |
3742 | return 0; | |
f59c8f9f | 3743 | } |
7ad68e2f | 3744 | |
39f802d6 TI |
3745 | if (attr == &dev_attr_microamps.attr) |
3746 | return ops->get_current_limit ? mode : 0; | |
3747 | ||
3748 | if (attr == &dev_attr_opmode.attr) | |
3749 | return ops->get_mode ? mode : 0; | |
3750 | ||
3751 | if (attr == &dev_attr_state.attr) | |
3752 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3753 | ||
3754 | if (attr == &dev_attr_status.attr) | |
3755 | return ops->get_status ? mode : 0; | |
3756 | ||
3757 | if (attr == &dev_attr_bypass.attr) | |
3758 | return ops->get_bypass ? mode : 0; | |
3759 | ||
7ad68e2f | 3760 | /* some attributes are type-specific */ |
39f802d6 TI |
3761 | if (attr == &dev_attr_requested_microamps.attr) |
3762 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3763 | |
7ad68e2f | 3764 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3765 | if (attr == &dev_attr_min_microvolts.attr || |
3766 | attr == &dev_attr_max_microvolts.attr) | |
3767 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3768 | ||
3769 | if (attr == &dev_attr_min_microamps.attr || | |
3770 | attr == &dev_attr_max_microamps.attr) | |
3771 | return ops->set_current_limit ? mode : 0; | |
3772 | ||
3773 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3774 | attr == &dev_attr_suspend_mem_state.attr || | |
3775 | attr == &dev_attr_suspend_disk_state.attr) | |
3776 | return mode; | |
3777 | ||
3778 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3779 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3780 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3781 | return ops->set_suspend_voltage ? mode : 0; | |
3782 | ||
3783 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
3784 | attr == &dev_attr_suspend_mem_mode.attr || | |
3785 | attr == &dev_attr_suspend_disk_mode.attr) | |
3786 | return ops->set_suspend_mode ? mode : 0; | |
3787 | ||
3788 | return mode; | |
3789 | } | |
3790 | ||
3791 | static const struct attribute_group regulator_dev_group = { | |
3792 | .attrs = regulator_dev_attrs, | |
3793 | .is_visible = regulator_attr_is_visible, | |
3794 | }; | |
3795 | ||
3796 | static const struct attribute_group *regulator_dev_groups[] = { | |
3797 | ®ulator_dev_group, | |
3798 | NULL | |
3799 | }; | |
7ad68e2f | 3800 | |
39f802d6 TI |
3801 | static void regulator_dev_release(struct device *dev) |
3802 | { | |
3803 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
3804 | |
3805 | kfree(rdev->constraints); | |
3806 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 3807 | kfree(rdev); |
7ad68e2f DB |
3808 | } |
3809 | ||
39f802d6 TI |
3810 | static struct class regulator_class = { |
3811 | .name = "regulator", | |
3812 | .dev_release = regulator_dev_release, | |
3813 | .dev_groups = regulator_dev_groups, | |
3814 | }; | |
3815 | ||
1130e5b3 MB |
3816 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3817 | { | |
a9eaa813 GR |
3818 | struct device *parent = rdev->dev.parent; |
3819 | const char *rname = rdev_get_name(rdev); | |
3820 | char name[NAME_MAX]; | |
3821 | ||
3822 | /* Avoid duplicate debugfs directory names */ | |
3823 | if (parent && rname == rdev->desc->name) { | |
3824 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
3825 | rname); | |
3826 | rname = name; | |
3827 | } | |
3828 | ||
3829 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 3830 | if (!rdev->debugfs) { |
1130e5b3 | 3831 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3832 | return; |
3833 | } | |
3834 | ||
3835 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3836 | &rdev->use_count); | |
3837 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3838 | &rdev->open_count); | |
f59c8f9f MB |
3839 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3840 | &rdev->bypass_count); | |
1130e5b3 MB |
3841 | } |
3842 | ||
414c70cb LG |
3843 | /** |
3844 | * regulator_register - register regulator | |
69279fb9 | 3845 | * @regulator_desc: regulator to register |
f47531b1 | 3846 | * @cfg: runtime configuration for regulator |
414c70cb LG |
3847 | * |
3848 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3849 | * Returns a valid pointer to struct regulator_dev on success |
3850 | * or an ERR_PTR() on error. | |
414c70cb | 3851 | */ |
65f26846 MB |
3852 | struct regulator_dev * |
3853 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 3854 | const struct regulator_config *cfg) |
414c70cb | 3855 | { |
9a8f5e07 | 3856 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3857 | const struct regulator_init_data *init_data; |
1b3de223 | 3858 | struct regulator_config *config = NULL; |
72dca06f | 3859 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 3860 | struct regulator_dev *rdev; |
32c8fad4 | 3861 | struct device *dev; |
a5766f11 | 3862 | int ret, i; |
414c70cb | 3863 | |
1b3de223 | 3864 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
3865 | return ERR_PTR(-EINVAL); |
3866 | ||
1b3de223 | 3867 | dev = cfg->dev; |
dcf70112 | 3868 | WARN_ON(!dev); |
32c8fad4 | 3869 | |
414c70cb LG |
3870 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3871 | return ERR_PTR(-EINVAL); | |
3872 | ||
cd78dfc6 DL |
3873 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3874 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3875 | return ERR_PTR(-EINVAL); |
3876 | ||
476c2d83 MB |
3877 | /* Only one of each should be implemented */ |
3878 | WARN_ON(regulator_desc->ops->get_voltage && | |
3879 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3880 | WARN_ON(regulator_desc->ops->set_voltage && |
3881 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3882 | |
3883 | /* If we're using selectors we must implement list_voltage. */ | |
3884 | if (regulator_desc->ops->get_voltage_sel && | |
3885 | !regulator_desc->ops->list_voltage) { | |
3886 | return ERR_PTR(-EINVAL); | |
3887 | } | |
e8eef82b MB |
3888 | if (regulator_desc->ops->set_voltage_sel && |
3889 | !regulator_desc->ops->list_voltage) { | |
3890 | return ERR_PTR(-EINVAL); | |
3891 | } | |
476c2d83 | 3892 | |
414c70cb LG |
3893 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3894 | if (rdev == NULL) | |
3895 | return ERR_PTR(-ENOMEM); | |
3896 | ||
1b3de223 KK |
3897 | /* |
3898 | * Duplicate the config so the driver could override it after | |
3899 | * parsing init data. | |
3900 | */ | |
3901 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
3902 | if (config == NULL) { | |
3903 | kfree(rdev); | |
3904 | return ERR_PTR(-ENOMEM); | |
3905 | } | |
3906 | ||
bfa21a0d | 3907 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
3908 | &rdev->dev.of_node); |
3909 | if (!init_data) { | |
3910 | init_data = config->init_data; | |
3911 | rdev->dev.of_node = of_node_get(config->of_node); | |
3912 | } | |
3913 | ||
414c70cb LG |
3914 | mutex_lock(®ulator_list_mutex); |
3915 | ||
3916 | mutex_init(&rdev->mutex); | |
c172708d | 3917 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3918 | rdev->owner = regulator_desc->owner; |
3919 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3920 | if (config->regmap) |
3921 | rdev->regmap = config->regmap; | |
52b84dac | 3922 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3923 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3924 | else if (dev->parent) |
3925 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3926 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3927 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3928 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3929 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3930 | |
a5766f11 | 3931 | /* preform any regulator specific init */ |
9a8f5e07 | 3932 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3933 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3934 | if (ret < 0) |
3935 | goto clean; | |
a5766f11 LG |
3936 | } |
3937 | ||
daad134d KA |
3938 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
3939 | gpio_is_valid(config->ena_gpio)) { | |
3940 | ret = regulator_ena_gpio_request(rdev, config); | |
3941 | if (ret != 0) { | |
3942 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3943 | config->ena_gpio, ret); | |
32165230 | 3944 | goto clean; |
daad134d KA |
3945 | } |
3946 | } | |
3947 | ||
a5766f11 | 3948 | /* register with sysfs */ |
414c70cb | 3949 | rdev->dev.class = ®ulator_class; |
a5766f11 | 3950 | rdev->dev.parent = dev; |
72dca06f | 3951 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 3952 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 3953 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3954 | if (ret != 0) { |
3955 | put_device(&rdev->dev); | |
32165230 | 3956 | goto wash; |
ad7725cb | 3957 | } |
a5766f11 LG |
3958 | |
3959 | dev_set_drvdata(&rdev->dev, rdev); | |
3960 | ||
74f544c1 | 3961 | /* set regulator constraints */ |
9a8f5e07 MB |
3962 | if (init_data) |
3963 | constraints = &init_data->constraints; | |
3964 | ||
3965 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3966 | if (ret < 0) |
3967 | goto scrub; | |
3968 | ||
9a8f5e07 | 3969 | if (init_data && init_data->supply_regulator) |
6261b06d | 3970 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 3971 | else if (regulator_desc->supply_name) |
6261b06d | 3972 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 3973 | |
a5766f11 | 3974 | /* add consumers devices */ |
9a8f5e07 MB |
3975 | if (init_data) { |
3976 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3977 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3978 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3979 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3980 | if (ret < 0) { |
3981 | dev_err(dev, "Failed to set supply %s\n", | |
3982 | init_data->consumer_supplies[i].supply); | |
3983 | goto unset_supplies; | |
3984 | } | |
23c2f041 | 3985 | } |
414c70cb | 3986 | } |
a5766f11 | 3987 | |
1130e5b3 | 3988 | rdev_init_debugfs(rdev); |
a5766f11 | 3989 | out: |
414c70cb | 3990 | mutex_unlock(®ulator_list_mutex); |
1b3de223 | 3991 | kfree(config); |
414c70cb | 3992 | return rdev; |
4fca9545 | 3993 | |
d4033b54 JN |
3994 | unset_supplies: |
3995 | unset_regulator_supplies(rdev); | |
3996 | ||
4fca9545 | 3997 | scrub: |
f19b00da | 3998 | regulator_ena_gpio_free(rdev); |
4fca9545 | 3999 | device_unregister(&rdev->dev); |
53032daf PW |
4000 | /* device core frees rdev */ |
4001 | rdev = ERR_PTR(ret); | |
4002 | goto out; | |
4003 | ||
32165230 KA |
4004 | wash: |
4005 | regulator_ena_gpio_free(rdev); | |
4fca9545 DB |
4006 | clean: |
4007 | kfree(rdev); | |
4008 | rdev = ERR_PTR(ret); | |
4009 | goto out; | |
414c70cb LG |
4010 | } |
4011 | EXPORT_SYMBOL_GPL(regulator_register); | |
4012 | ||
4013 | /** | |
4014 | * regulator_unregister - unregister regulator | |
69279fb9 | 4015 | * @rdev: regulator to unregister |
414c70cb LG |
4016 | * |
4017 | * Called by regulator drivers to unregister a regulator. | |
4018 | */ | |
4019 | void regulator_unregister(struct regulator_dev *rdev) | |
4020 | { | |
4021 | if (rdev == NULL) | |
4022 | return; | |
4023 | ||
891636ea MB |
4024 | if (rdev->supply) { |
4025 | while (rdev->use_count--) | |
4026 | regulator_disable(rdev->supply); | |
e032b376 | 4027 | regulator_put(rdev->supply); |
891636ea | 4028 | } |
414c70cb | 4029 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 4030 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 4031 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 4032 | WARN_ON(rdev->open_count); |
0f1d747b | 4033 | unset_regulator_supplies(rdev); |
414c70cb | 4034 | list_del(&rdev->list); |
7cd71c3b | 4035 | mutex_unlock(®ulator_list_mutex); |
f19b00da | 4036 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 4037 | device_unregister(&rdev->dev); |
414c70cb LG |
4038 | } |
4039 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
4040 | ||
85f3b431 TV |
4041 | static int _regulator_suspend_prepare(struct device *dev, void *data) |
4042 | { | |
4043 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4044 | const suspend_state_t *state = data; | |
4045 | int ret; | |
4046 | ||
4047 | mutex_lock(&rdev->mutex); | |
4048 | ret = suspend_prepare(rdev, *state); | |
4049 | mutex_unlock(&rdev->mutex); | |
4050 | ||
4051 | return ret; | |
4052 | } | |
4053 | ||
414c70cb | 4054 | /** |
cf7bbcdf | 4055 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
4056 | * @state: system suspend state |
4057 | * | |
4058 | * Configure each regulator with it's suspend operating parameters for state. | |
4059 | * This will usually be called by machine suspend code prior to supending. | |
4060 | */ | |
4061 | int regulator_suspend_prepare(suspend_state_t state) | |
4062 | { | |
414c70cb LG |
4063 | /* ON is handled by regulator active state */ |
4064 | if (state == PM_SUSPEND_ON) | |
4065 | return -EINVAL; | |
4066 | ||
85f3b431 TV |
4067 | return class_for_each_device(®ulator_class, NULL, &state, |
4068 | _regulator_suspend_prepare); | |
4069 | } | |
4070 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
414c70cb | 4071 | |
85f3b431 TV |
4072 | static int _regulator_suspend_finish(struct device *dev, void *data) |
4073 | { | |
4074 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4075 | int ret; | |
414c70cb | 4076 | |
85f3b431 TV |
4077 | mutex_lock(&rdev->mutex); |
4078 | if (rdev->use_count > 0 || rdev->constraints->always_on) { | |
4079 | if (!_regulator_is_enabled(rdev)) { | |
4080 | ret = _regulator_do_enable(rdev); | |
4081 | if (ret) | |
4082 | dev_err(dev, | |
4083 | "Failed to resume regulator %d\n", | |
4084 | ret); | |
414c70cb | 4085 | } |
85f3b431 TV |
4086 | } else { |
4087 | if (!have_full_constraints()) | |
4088 | goto unlock; | |
4089 | if (!_regulator_is_enabled(rdev)) | |
4090 | goto unlock; | |
4091 | ||
4092 | ret = _regulator_do_disable(rdev); | |
4093 | if (ret) | |
4094 | dev_err(dev, "Failed to suspend regulator %d\n", ret); | |
414c70cb | 4095 | } |
85f3b431 TV |
4096 | unlock: |
4097 | mutex_unlock(&rdev->mutex); | |
4098 | ||
4099 | /* Keep processing regulators in spite of any errors */ | |
4100 | return 0; | |
414c70cb | 4101 | } |
414c70cb | 4102 | |
7a32b589 MH |
4103 | /** |
4104 | * regulator_suspend_finish - resume regulators from system wide suspend | |
4105 | * | |
4106 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
4107 | * and that should be turned on according to the regulators properties. | |
4108 | */ | |
4109 | int regulator_suspend_finish(void) | |
4110 | { | |
85f3b431 TV |
4111 | return class_for_each_device(®ulator_class, NULL, NULL, |
4112 | _regulator_suspend_finish); | |
7a32b589 MH |
4113 | } |
4114 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
4115 | ||
ca725561 MB |
4116 | /** |
4117 | * regulator_has_full_constraints - the system has fully specified constraints | |
4118 | * | |
4119 | * Calling this function will cause the regulator API to disable all | |
4120 | * regulators which have a zero use count and don't have an always_on | |
4121 | * constraint in a late_initcall. | |
4122 | * | |
4123 | * The intention is that this will become the default behaviour in a | |
4124 | * future kernel release so users are encouraged to use this facility | |
4125 | * now. | |
4126 | */ | |
4127 | void regulator_has_full_constraints(void) | |
4128 | { | |
4129 | has_full_constraints = 1; | |
4130 | } | |
4131 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
4132 | ||
414c70cb LG |
4133 | /** |
4134 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 4135 | * @rdev: regulator |
414c70cb LG |
4136 | * |
4137 | * Get rdev regulator driver private data. This call can be used in the | |
4138 | * regulator driver context. | |
4139 | */ | |
4140 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
4141 | { | |
4142 | return rdev->reg_data; | |
4143 | } | |
4144 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
4145 | ||
4146 | /** | |
4147 | * regulator_get_drvdata - get regulator driver data | |
4148 | * @regulator: regulator | |
4149 | * | |
4150 | * Get regulator driver private data. This call can be used in the consumer | |
4151 | * driver context when non API regulator specific functions need to be called. | |
4152 | */ | |
4153 | void *regulator_get_drvdata(struct regulator *regulator) | |
4154 | { | |
4155 | return regulator->rdev->reg_data; | |
4156 | } | |
4157 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
4158 | ||
4159 | /** | |
4160 | * regulator_set_drvdata - set regulator driver data | |
4161 | * @regulator: regulator | |
4162 | * @data: data | |
4163 | */ | |
4164 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
4165 | { | |
4166 | regulator->rdev->reg_data = data; | |
4167 | } | |
4168 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
4169 | ||
4170 | /** | |
4171 | * regulator_get_id - get regulator ID | |
69279fb9 | 4172 | * @rdev: regulator |
414c70cb LG |
4173 | */ |
4174 | int rdev_get_id(struct regulator_dev *rdev) | |
4175 | { | |
4176 | return rdev->desc->id; | |
4177 | } | |
4178 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
4179 | ||
a5766f11 LG |
4180 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
4181 | { | |
4182 | return &rdev->dev; | |
4183 | } | |
4184 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
4185 | ||
4186 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
4187 | { | |
4188 | return reg_init_data->driver_data; | |
4189 | } | |
4190 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
4191 | ||
ba55a974 MB |
4192 | #ifdef CONFIG_DEBUG_FS |
4193 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
4194 | size_t count, loff_t *ppos) | |
4195 | { | |
4196 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
4197 | ssize_t len, ret = 0; | |
4198 | struct regulator_map *map; | |
4199 | ||
4200 | if (!buf) | |
4201 | return -ENOMEM; | |
4202 | ||
4203 | list_for_each_entry(map, ®ulator_map_list, list) { | |
4204 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
4205 | "%s -> %s.%s\n", | |
4206 | rdev_get_name(map->regulator), map->dev_name, | |
4207 | map->supply); | |
4208 | if (len >= 0) | |
4209 | ret += len; | |
4210 | if (ret > PAGE_SIZE) { | |
4211 | ret = PAGE_SIZE; | |
4212 | break; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
4217 | ||
4218 | kfree(buf); | |
4219 | ||
4220 | return ret; | |
4221 | } | |
24751434 | 4222 | #endif |
ba55a974 MB |
4223 | |
4224 | static const struct file_operations supply_map_fops = { | |
24751434 | 4225 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
4226 | .read = supply_map_read_file, |
4227 | .llseek = default_llseek, | |
ba55a974 | 4228 | #endif |
24751434 | 4229 | }; |
ba55a974 | 4230 | |
7c225ec9 | 4231 | #ifdef CONFIG_DEBUG_FS |
85f3b431 TV |
4232 | struct summary_data { |
4233 | struct seq_file *s; | |
4234 | struct regulator_dev *parent; | |
4235 | int level; | |
4236 | }; | |
4237 | ||
4238 | static void regulator_summary_show_subtree(struct seq_file *s, | |
4239 | struct regulator_dev *rdev, | |
4240 | int level); | |
4241 | ||
4242 | static int regulator_summary_show_children(struct device *dev, void *data) | |
4243 | { | |
4244 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4245 | struct summary_data *summary_data = data; | |
4246 | ||
4247 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
4248 | regulator_summary_show_subtree(summary_data->s, rdev, | |
4249 | summary_data->level + 1); | |
4250 | ||
4251 | return 0; | |
4252 | } | |
4253 | ||
7c225ec9 HS |
4254 | static void regulator_summary_show_subtree(struct seq_file *s, |
4255 | struct regulator_dev *rdev, | |
4256 | int level) | |
4257 | { | |
7c225ec9 HS |
4258 | struct regulation_constraints *c; |
4259 | struct regulator *consumer; | |
85f3b431 | 4260 | struct summary_data summary_data; |
7c225ec9 HS |
4261 | |
4262 | if (!rdev) | |
4263 | return; | |
4264 | ||
7c225ec9 HS |
4265 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
4266 | level * 3 + 1, "", | |
4267 | 30 - level * 3, rdev_get_name(rdev), | |
4268 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
4269 | ||
23296099 HS |
4270 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
4271 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
4272 | |
4273 | c = rdev->constraints; | |
4274 | if (c) { | |
4275 | switch (rdev->desc->type) { | |
4276 | case REGULATOR_VOLTAGE: | |
4277 | seq_printf(s, "%5dmV %5dmV ", | |
4278 | c->min_uV / 1000, c->max_uV / 1000); | |
4279 | break; | |
4280 | case REGULATOR_CURRENT: | |
4281 | seq_printf(s, "%5dmA %5dmA ", | |
4282 | c->min_uA / 1000, c->max_uA / 1000); | |
4283 | break; | |
4284 | } | |
4285 | } | |
4286 | ||
4287 | seq_puts(s, "\n"); | |
4288 | ||
4289 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
4290 | if (consumer->dev->class == ®ulator_class) | |
4291 | continue; | |
4292 | ||
4293 | seq_printf(s, "%*s%-*s ", | |
4294 | (level + 1) * 3 + 1, "", | |
4295 | 30 - (level + 1) * 3, dev_name(consumer->dev)); | |
4296 | ||
4297 | switch (rdev->desc->type) { | |
4298 | case REGULATOR_VOLTAGE: | |
23296099 | 4299 | seq_printf(s, "%37dmV %5dmV", |
7c225ec9 HS |
4300 | consumer->min_uV / 1000, |
4301 | consumer->max_uV / 1000); | |
4302 | break; | |
4303 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4304 | break; |
4305 | } | |
4306 | ||
4307 | seq_puts(s, "\n"); | |
4308 | } | |
4309 | ||
85f3b431 TV |
4310 | summary_data.s = s; |
4311 | summary_data.level = level; | |
4312 | summary_data.parent = rdev; | |
7c225ec9 | 4313 | |
85f3b431 TV |
4314 | class_for_each_device(®ulator_class, NULL, &summary_data, |
4315 | regulator_summary_show_children); | |
7c225ec9 HS |
4316 | } |
4317 | ||
85f3b431 | 4318 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 4319 | { |
85f3b431 TV |
4320 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4321 | struct seq_file *s = data; | |
7c225ec9 | 4322 | |
85f3b431 TV |
4323 | if (!rdev->supply) |
4324 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 4325 | |
85f3b431 TV |
4326 | return 0; |
4327 | } | |
7c225ec9 | 4328 | |
85f3b431 TV |
4329 | static int regulator_summary_show(struct seq_file *s, void *data) |
4330 | { | |
4331 | seq_puts(s, " regulator use open bypass voltage current min max\n"); | |
4332 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 | 4333 | |
85f3b431 TV |
4334 | class_for_each_device(®ulator_class, NULL, s, |
4335 | regulator_summary_show_roots); | |
7c225ec9 HS |
4336 | |
4337 | return 0; | |
4338 | } | |
4339 | ||
4340 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4341 | { | |
4342 | return single_open(file, regulator_summary_show, inode->i_private); | |
4343 | } | |
4344 | #endif | |
4345 | ||
4346 | static const struct file_operations regulator_summary_fops = { | |
4347 | #ifdef CONFIG_DEBUG_FS | |
4348 | .open = regulator_summary_open, | |
4349 | .read = seq_read, | |
4350 | .llseek = seq_lseek, | |
4351 | .release = single_release, | |
4352 | #endif | |
4353 | }; | |
4354 | ||
414c70cb LG |
4355 | static int __init regulator_init(void) |
4356 | { | |
34abbd68 MB |
4357 | int ret; |
4358 | ||
34abbd68 MB |
4359 | ret = class_register(®ulator_class); |
4360 | ||
1130e5b3 | 4361 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4362 | if (!debugfs_root) |
1130e5b3 | 4363 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4364 | |
f4d562c6 MB |
4365 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4366 | &supply_map_fops); | |
1130e5b3 | 4367 | |
7c225ec9 | 4368 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 4369 | NULL, ®ulator_summary_fops); |
7c225ec9 | 4370 | |
34abbd68 MB |
4371 | regulator_dummy_init(); |
4372 | ||
4373 | return ret; | |
414c70cb LG |
4374 | } |
4375 | ||
4376 | /* init early to allow our consumers to complete system booting */ | |
4377 | core_initcall(regulator_init); | |
ca725561 | 4378 | |
609ca5f3 | 4379 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 4380 | { |
609ca5f3 MB |
4381 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4382 | const struct regulator_ops *ops = rdev->desc->ops; | |
4383 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 4384 | int enabled, ret; |
ca725561 | 4385 | |
609ca5f3 MB |
4386 | if (c && c->always_on) |
4387 | return 0; | |
4388 | ||
4389 | if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) | |
4390 | return 0; | |
4391 | ||
4392 | mutex_lock(&rdev->mutex); | |
4393 | ||
4394 | if (rdev->use_count) | |
4395 | goto unlock; | |
4396 | ||
4397 | /* If we can't read the status assume it's on. */ | |
4398 | if (ops->is_enabled) | |
4399 | enabled = ops->is_enabled(rdev); | |
4400 | else | |
4401 | enabled = 1; | |
4402 | ||
4403 | if (!enabled) | |
4404 | goto unlock; | |
4405 | ||
4406 | if (have_full_constraints()) { | |
4407 | /* We log since this may kill the system if it goes | |
4408 | * wrong. */ | |
4409 | rdev_info(rdev, "disabling\n"); | |
4410 | ret = _regulator_do_disable(rdev); | |
4411 | if (ret != 0) | |
4412 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
4413 | } else { | |
4414 | /* The intention is that in future we will | |
4415 | * assume that full constraints are provided | |
4416 | * so warn even if we aren't going to do | |
4417 | * anything here. | |
4418 | */ | |
4419 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
4420 | } | |
4421 | ||
4422 | unlock: | |
4423 | mutex_unlock(&rdev->mutex); | |
4424 | ||
4425 | return 0; | |
4426 | } | |
4427 | ||
4428 | static int __init regulator_init_complete(void) | |
4429 | { | |
86f5fcfc MB |
4430 | /* |
4431 | * Since DT doesn't provide an idiomatic mechanism for | |
4432 | * enabling full constraints and since it's much more natural | |
4433 | * with DT to provide them just assume that a DT enabled | |
4434 | * system has full constraints. | |
4435 | */ | |
4436 | if (of_have_populated_dt()) | |
4437 | has_full_constraints = true; | |
4438 | ||
ca725561 | 4439 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
4440 | * we have permission to change the status for and which are |
4441 | * not in use or always_on. This is effectively the default | |
4442 | * for DT and ACPI as they have full constraints. | |
ca725561 | 4443 | */ |
609ca5f3 MB |
4444 | class_for_each_device(®ulator_class, NULL, NULL, |
4445 | regulator_late_cleanup); | |
ca725561 MB |
4446 | |
4447 | return 0; | |
4448 | } | |
fd482a3e | 4449 | late_initcall_sync(regulator_init_complete); |