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> |
69511a45 | 26 | #include <linux/of.h> |
65b19ce6 | 27 | #include <linux/regmap.h> |
69511a45 | 28 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
29 | #include <linux/regulator/consumer.h> |
30 | #include <linux/regulator/driver.h> | |
31 | #include <linux/regulator/machine.h> | |
65602c32 | 32 | #include <linux/module.h> |
414c70cb | 33 | |
02fa3ec0 MB |
34 | #define CREATE_TRACE_POINTS |
35 | #include <trace/events/regulator.h> | |
36 | ||
34abbd68 MB |
37 | #include "dummy.h" |
38 | ||
7d51a0db MB |
39 | #define rdev_crit(rdev, fmt, ...) \ |
40 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
41 | #define rdev_err(rdev, fmt, ...) \ |
42 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | #define rdev_warn(rdev, fmt, ...) \ | |
44 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | #define rdev_info(rdev, fmt, ...) \ | |
46 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
47 | #define rdev_dbg(rdev, fmt, ...) \ | |
48 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
49 | ||
414c70cb LG |
50 | static DEFINE_MUTEX(regulator_list_mutex); |
51 | static LIST_HEAD(regulator_list); | |
52 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 53 | static bool has_full_constraints; |
688fe99a | 54 | static bool board_wants_dummy_regulator; |
414c70cb | 55 | |
1130e5b3 | 56 | static struct dentry *debugfs_root; |
1130e5b3 | 57 | |
8dc5390d | 58 | /* |
414c70cb LG |
59 | * struct regulator_map |
60 | * | |
61 | * Used to provide symbolic supply names to devices. | |
62 | */ | |
63 | struct regulator_map { | |
64 | struct list_head list; | |
40f9244f | 65 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 66 | const char *supply; |
a5766f11 | 67 | struct regulator_dev *regulator; |
414c70cb LG |
68 | }; |
69 | ||
414c70cb LG |
70 | /* |
71 | * struct regulator | |
72 | * | |
73 | * One for each consumer device. | |
74 | */ | |
75 | struct regulator { | |
76 | struct device *dev; | |
77 | struct list_head list; | |
6492bc1b | 78 | unsigned int always_on:1; |
414c70cb LG |
79 | int uA_load; |
80 | int min_uV; | |
81 | int max_uV; | |
414c70cb LG |
82 | char *supply_name; |
83 | struct device_attribute dev_attr; | |
84 | struct regulator_dev *rdev; | |
5de70519 | 85 | struct dentry *debugfs; |
414c70cb LG |
86 | }; |
87 | ||
88 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 89 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
90 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
91 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
92 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
93 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
94 | unsigned long event, void *data); | |
75790251 MB |
95 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
96 | int min_uV, int max_uV); | |
3801b86a MB |
97 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
98 | struct device *dev, | |
99 | const char *supply_name); | |
414c70cb | 100 | |
1083c393 MB |
101 | static const char *rdev_get_name(struct regulator_dev *rdev) |
102 | { | |
103 | if (rdev->constraints && rdev->constraints->name) | |
104 | return rdev->constraints->name; | |
105 | else if (rdev->desc->name) | |
106 | return rdev->desc->name; | |
107 | else | |
108 | return ""; | |
109 | } | |
110 | ||
414c70cb LG |
111 | /* gets the regulator for a given consumer device */ |
112 | static struct regulator *get_device_regulator(struct device *dev) | |
113 | { | |
114 | struct regulator *regulator = NULL; | |
115 | struct regulator_dev *rdev; | |
116 | ||
117 | mutex_lock(®ulator_list_mutex); | |
118 | list_for_each_entry(rdev, ®ulator_list, list) { | |
119 | mutex_lock(&rdev->mutex); | |
120 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
121 | if (regulator->dev == dev) { | |
122 | mutex_unlock(&rdev->mutex); | |
123 | mutex_unlock(®ulator_list_mutex); | |
124 | return regulator; | |
125 | } | |
126 | } | |
127 | mutex_unlock(&rdev->mutex); | |
128 | } | |
129 | mutex_unlock(®ulator_list_mutex); | |
130 | return NULL; | |
131 | } | |
132 | ||
69511a45 RN |
133 | /** |
134 | * of_get_regulator - get a regulator device node based on supply name | |
135 | * @dev: Device pointer for the consumer (of regulator) device | |
136 | * @supply: regulator supply name | |
137 | * | |
138 | * Extract the regulator device node corresponding to the supply name. | |
139 | * retruns the device node corresponding to the regulator if found, else | |
140 | * returns NULL. | |
141 | */ | |
142 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
143 | { | |
144 | struct device_node *regnode = NULL; | |
145 | char prop_name[32]; /* 32 is max size of property name */ | |
146 | ||
147 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
148 | ||
149 | snprintf(prop_name, 32, "%s-supply", supply); | |
150 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
151 | ||
152 | if (!regnode) { | |
16fbcc3b | 153 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
154 | prop_name, dev->of_node->full_name); |
155 | return NULL; | |
156 | } | |
157 | return regnode; | |
158 | } | |
159 | ||
6492bc1b MB |
160 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
161 | { | |
162 | if (!rdev->constraints) | |
163 | return 0; | |
164 | ||
165 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
166 | return 1; | |
167 | else | |
168 | return 0; | |
169 | } | |
170 | ||
414c70cb LG |
171 | /* Platform voltage constraint check */ |
172 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
173 | int *min_uV, int *max_uV) | |
174 | { | |
175 | BUG_ON(*min_uV > *max_uV); | |
176 | ||
177 | if (!rdev->constraints) { | |
5da84fd9 | 178 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
179 | return -ENODEV; |
180 | } | |
181 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 182 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
183 | return -EPERM; |
184 | } | |
185 | ||
186 | if (*max_uV > rdev->constraints->max_uV) | |
187 | *max_uV = rdev->constraints->max_uV; | |
188 | if (*min_uV < rdev->constraints->min_uV) | |
189 | *min_uV = rdev->constraints->min_uV; | |
190 | ||
89f425ed MB |
191 | if (*min_uV > *max_uV) { |
192 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 193 | *min_uV, *max_uV); |
414c70cb | 194 | return -EINVAL; |
89f425ed | 195 | } |
414c70cb LG |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
05fda3b1 TP |
200 | /* Make sure we select a voltage that suits the needs of all |
201 | * regulator consumers | |
202 | */ | |
203 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
204 | int *min_uV, int *max_uV) | |
205 | { | |
206 | struct regulator *regulator; | |
207 | ||
208 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
209 | /* |
210 | * Assume consumers that didn't say anything are OK | |
211 | * with anything in the constraint range. | |
212 | */ | |
213 | if (!regulator->min_uV && !regulator->max_uV) | |
214 | continue; | |
215 | ||
05fda3b1 TP |
216 | if (*max_uV > regulator->max_uV) |
217 | *max_uV = regulator->max_uV; | |
218 | if (*min_uV < regulator->min_uV) | |
219 | *min_uV = regulator->min_uV; | |
220 | } | |
221 | ||
222 | if (*min_uV > *max_uV) | |
223 | return -EINVAL; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
414c70cb LG |
228 | /* current constraint check */ |
229 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
230 | int *min_uA, int *max_uA) | |
231 | { | |
232 | BUG_ON(*min_uA > *max_uA); | |
233 | ||
234 | if (!rdev->constraints) { | |
5da84fd9 | 235 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
236 | return -ENODEV; |
237 | } | |
238 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 239 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
240 | return -EPERM; |
241 | } | |
242 | ||
243 | if (*max_uA > rdev->constraints->max_uA) | |
244 | *max_uA = rdev->constraints->max_uA; | |
245 | if (*min_uA < rdev->constraints->min_uA) | |
246 | *min_uA = rdev->constraints->min_uA; | |
247 | ||
89f425ed MB |
248 | if (*min_uA > *max_uA) { |
249 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 250 | *min_uA, *max_uA); |
414c70cb | 251 | return -EINVAL; |
89f425ed | 252 | } |
414c70cb LG |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
257 | /* operating mode constraint check */ | |
2c608234 | 258 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 259 | { |
2c608234 | 260 | switch (*mode) { |
e573520b DB |
261 | case REGULATOR_MODE_FAST: |
262 | case REGULATOR_MODE_NORMAL: | |
263 | case REGULATOR_MODE_IDLE: | |
264 | case REGULATOR_MODE_STANDBY: | |
265 | break; | |
266 | default: | |
89f425ed | 267 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
268 | return -EINVAL; |
269 | } | |
270 | ||
414c70cb | 271 | if (!rdev->constraints) { |
5da84fd9 | 272 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
273 | return -ENODEV; |
274 | } | |
275 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 276 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
277 | return -EPERM; |
278 | } | |
2c608234 MB |
279 | |
280 | /* The modes are bitmasks, the most power hungry modes having | |
281 | * the lowest values. If the requested mode isn't supported | |
282 | * try higher modes. */ | |
283 | while (*mode) { | |
284 | if (rdev->constraints->valid_modes_mask & *mode) | |
285 | return 0; | |
286 | *mode /= 2; | |
414c70cb | 287 | } |
2c608234 MB |
288 | |
289 | return -EINVAL; | |
414c70cb LG |
290 | } |
291 | ||
292 | /* dynamic regulator mode switching constraint check */ | |
293 | static int regulator_check_drms(struct regulator_dev *rdev) | |
294 | { | |
295 | if (!rdev->constraints) { | |
5da84fd9 | 296 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
297 | return -ENODEV; |
298 | } | |
299 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 300 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
301 | return -EPERM; |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static ssize_t device_requested_uA_show(struct device *dev, | |
307 | struct device_attribute *attr, char *buf) | |
308 | { | |
309 | struct regulator *regulator; | |
310 | ||
311 | regulator = get_device_regulator(dev); | |
312 | if (regulator == NULL) | |
313 | return 0; | |
314 | ||
315 | return sprintf(buf, "%d\n", regulator->uA_load); | |
316 | } | |
317 | ||
318 | static ssize_t regulator_uV_show(struct device *dev, | |
319 | struct device_attribute *attr, char *buf) | |
320 | { | |
a5766f11 | 321 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
322 | ssize_t ret; |
323 | ||
324 | mutex_lock(&rdev->mutex); | |
325 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
326 | mutex_unlock(&rdev->mutex); | |
327 | ||
328 | return ret; | |
329 | } | |
7ad68e2f | 330 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
331 | |
332 | static ssize_t regulator_uA_show(struct device *dev, | |
333 | struct device_attribute *attr, char *buf) | |
334 | { | |
a5766f11 | 335 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
336 | |
337 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
338 | } | |
7ad68e2f | 339 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 340 | |
bc558a60 MB |
341 | static ssize_t regulator_name_show(struct device *dev, |
342 | struct device_attribute *attr, char *buf) | |
343 | { | |
344 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 345 | |
1083c393 | 346 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
347 | } |
348 | ||
4fca9545 | 349 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 350 | { |
414c70cb LG |
351 | switch (mode) { |
352 | case REGULATOR_MODE_FAST: | |
353 | return sprintf(buf, "fast\n"); | |
354 | case REGULATOR_MODE_NORMAL: | |
355 | return sprintf(buf, "normal\n"); | |
356 | case REGULATOR_MODE_IDLE: | |
357 | return sprintf(buf, "idle\n"); | |
358 | case REGULATOR_MODE_STANDBY: | |
359 | return sprintf(buf, "standby\n"); | |
360 | } | |
361 | return sprintf(buf, "unknown\n"); | |
362 | } | |
363 | ||
4fca9545 DB |
364 | static ssize_t regulator_opmode_show(struct device *dev, |
365 | struct device_attribute *attr, char *buf) | |
414c70cb | 366 | { |
a5766f11 | 367 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 368 | |
4fca9545 DB |
369 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
370 | } | |
7ad68e2f | 371 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
372 | |
373 | static ssize_t regulator_print_state(char *buf, int state) | |
374 | { | |
414c70cb LG |
375 | if (state > 0) |
376 | return sprintf(buf, "enabled\n"); | |
377 | else if (state == 0) | |
378 | return sprintf(buf, "disabled\n"); | |
379 | else | |
380 | return sprintf(buf, "unknown\n"); | |
381 | } | |
382 | ||
4fca9545 DB |
383 | static ssize_t regulator_state_show(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
387 | ssize_t ret; |
388 | ||
389 | mutex_lock(&rdev->mutex); | |
390 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
391 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 392 | |
9332546f | 393 | return ret; |
4fca9545 | 394 | } |
7ad68e2f | 395 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 396 | |
853116a1 DB |
397 | static ssize_t regulator_status_show(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
399 | { | |
400 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
401 | int status; | |
402 | char *label; | |
403 | ||
404 | status = rdev->desc->ops->get_status(rdev); | |
405 | if (status < 0) | |
406 | return status; | |
407 | ||
408 | switch (status) { | |
409 | case REGULATOR_STATUS_OFF: | |
410 | label = "off"; | |
411 | break; | |
412 | case REGULATOR_STATUS_ON: | |
413 | label = "on"; | |
414 | break; | |
415 | case REGULATOR_STATUS_ERROR: | |
416 | label = "error"; | |
417 | break; | |
418 | case REGULATOR_STATUS_FAST: | |
419 | label = "fast"; | |
420 | break; | |
421 | case REGULATOR_STATUS_NORMAL: | |
422 | label = "normal"; | |
423 | break; | |
424 | case REGULATOR_STATUS_IDLE: | |
425 | label = "idle"; | |
426 | break; | |
427 | case REGULATOR_STATUS_STANDBY: | |
428 | label = "standby"; | |
429 | break; | |
430 | default: | |
431 | return -ERANGE; | |
432 | } | |
433 | ||
434 | return sprintf(buf, "%s\n", label); | |
435 | } | |
436 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
437 | ||
414c70cb LG |
438 | static ssize_t regulator_min_uA_show(struct device *dev, |
439 | struct device_attribute *attr, char *buf) | |
440 | { | |
a5766f11 | 441 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
442 | |
443 | if (!rdev->constraints) | |
444 | return sprintf(buf, "constraint not defined\n"); | |
445 | ||
446 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
447 | } | |
7ad68e2f | 448 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
449 | |
450 | static ssize_t regulator_max_uA_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
454 | |
455 | if (!rdev->constraints) | |
456 | return sprintf(buf, "constraint not defined\n"); | |
457 | ||
458 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
459 | } | |
7ad68e2f | 460 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
461 | |
462 | static ssize_t regulator_min_uV_show(struct device *dev, | |
463 | struct device_attribute *attr, char *buf) | |
464 | { | |
a5766f11 | 465 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
466 | |
467 | if (!rdev->constraints) | |
468 | return sprintf(buf, "constraint not defined\n"); | |
469 | ||
470 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
471 | } | |
7ad68e2f | 472 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
473 | |
474 | static ssize_t regulator_max_uV_show(struct device *dev, | |
475 | struct device_attribute *attr, char *buf) | |
476 | { | |
a5766f11 | 477 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
478 | |
479 | if (!rdev->constraints) | |
480 | return sprintf(buf, "constraint not defined\n"); | |
481 | ||
482 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
483 | } | |
7ad68e2f | 484 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
485 | |
486 | static ssize_t regulator_total_uA_show(struct device *dev, | |
487 | struct device_attribute *attr, char *buf) | |
488 | { | |
a5766f11 | 489 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
490 | struct regulator *regulator; |
491 | int uA = 0; | |
492 | ||
493 | mutex_lock(&rdev->mutex); | |
494 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 495 | uA += regulator->uA_load; |
414c70cb LG |
496 | mutex_unlock(&rdev->mutex); |
497 | return sprintf(buf, "%d\n", uA); | |
498 | } | |
7ad68e2f | 499 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
500 | |
501 | static ssize_t regulator_num_users_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 | return sprintf(buf, "%d\n", rdev->use_count); |
506 | } | |
507 | ||
508 | static ssize_t regulator_type_show(struct device *dev, | |
509 | struct device_attribute *attr, char *buf) | |
510 | { | |
a5766f11 | 511 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
512 | |
513 | switch (rdev->desc->type) { | |
514 | case REGULATOR_VOLTAGE: | |
515 | return sprintf(buf, "voltage\n"); | |
516 | case REGULATOR_CURRENT: | |
517 | return sprintf(buf, "current\n"); | |
518 | } | |
519 | return sprintf(buf, "unknown\n"); | |
520 | } | |
521 | ||
522 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
523 | struct device_attribute *attr, char *buf) | |
524 | { | |
a5766f11 | 525 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 526 | |
414c70cb LG |
527 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
528 | } | |
7ad68e2f DB |
529 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
530 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
531 | |
532 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
533 | struct device_attribute *attr, char *buf) | |
534 | { | |
a5766f11 | 535 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 536 | |
414c70cb LG |
537 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
538 | } | |
7ad68e2f DB |
539 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
540 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
541 | |
542 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
543 | struct device_attribute *attr, char *buf) | |
544 | { | |
a5766f11 | 545 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 546 | |
414c70cb LG |
547 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
548 | } | |
7ad68e2f DB |
549 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
550 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 551 | |
414c70cb LG |
552 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
553 | struct device_attribute *attr, char *buf) | |
554 | { | |
a5766f11 | 555 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 556 | |
4fca9545 DB |
557 | return regulator_print_opmode(buf, |
558 | rdev->constraints->state_mem.mode); | |
414c70cb | 559 | } |
7ad68e2f DB |
560 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
561 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
562 | |
563 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
a5766f11 | 566 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 567 | |
4fca9545 DB |
568 | return regulator_print_opmode(buf, |
569 | rdev->constraints->state_disk.mode); | |
414c70cb | 570 | } |
7ad68e2f DB |
571 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
572 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
573 | |
574 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
575 | struct device_attribute *attr, char *buf) | |
576 | { | |
a5766f11 | 577 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 578 | |
4fca9545 DB |
579 | return regulator_print_opmode(buf, |
580 | rdev->constraints->state_standby.mode); | |
414c70cb | 581 | } |
7ad68e2f DB |
582 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
583 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
584 | |
585 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
586 | struct device_attribute *attr, char *buf) | |
587 | { | |
a5766f11 | 588 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 589 | |
4fca9545 DB |
590 | return regulator_print_state(buf, |
591 | rdev->constraints->state_mem.enabled); | |
414c70cb | 592 | } |
7ad68e2f DB |
593 | static DEVICE_ATTR(suspend_mem_state, 0444, |
594 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
595 | |
596 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
597 | struct device_attribute *attr, char *buf) | |
598 | { | |
a5766f11 | 599 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 600 | |
4fca9545 DB |
601 | return regulator_print_state(buf, |
602 | rdev->constraints->state_disk.enabled); | |
414c70cb | 603 | } |
7ad68e2f DB |
604 | static DEVICE_ATTR(suspend_disk_state, 0444, |
605 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
606 | |
607 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
608 | struct device_attribute *attr, char *buf) | |
609 | { | |
a5766f11 | 610 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 611 | |
4fca9545 DB |
612 | return regulator_print_state(buf, |
613 | rdev->constraints->state_standby.enabled); | |
414c70cb | 614 | } |
7ad68e2f DB |
615 | static DEVICE_ATTR(suspend_standby_state, 0444, |
616 | regulator_suspend_standby_state_show, NULL); | |
617 | ||
bc558a60 | 618 | |
7ad68e2f DB |
619 | /* |
620 | * These are the only attributes are present for all regulators. | |
621 | * Other attributes are a function of regulator functionality. | |
622 | */ | |
414c70cb | 623 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 624 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
625 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
626 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
627 | __ATTR_NULL, |
628 | }; | |
629 | ||
630 | static void regulator_dev_release(struct device *dev) | |
631 | { | |
a5766f11 | 632 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
633 | kfree(rdev); |
634 | } | |
635 | ||
636 | static struct class regulator_class = { | |
637 | .name = "regulator", | |
638 | .dev_release = regulator_dev_release, | |
639 | .dev_attrs = regulator_dev_attrs, | |
640 | }; | |
641 | ||
642 | /* Calculate the new optimum regulator operating mode based on the new total | |
643 | * consumer load. All locks held by caller */ | |
644 | static void drms_uA_update(struct regulator_dev *rdev) | |
645 | { | |
646 | struct regulator *sibling; | |
647 | int current_uA = 0, output_uV, input_uV, err; | |
648 | unsigned int mode; | |
649 | ||
650 | err = regulator_check_drms(rdev); | |
651 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
652 | (!rdev->desc->ops->get_voltage && |
653 | !rdev->desc->ops->get_voltage_sel) || | |
654 | !rdev->desc->ops->set_mode) | |
036de8ef | 655 | return; |
414c70cb LG |
656 | |
657 | /* get output voltage */ | |
1bf5a1f8 | 658 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
659 | if (output_uV <= 0) |
660 | return; | |
661 | ||
662 | /* get input voltage */ | |
1bf5a1f8 MB |
663 | input_uV = 0; |
664 | if (rdev->supply) | |
3f24f5ad | 665 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 666 | if (input_uV <= 0) |
414c70cb LG |
667 | input_uV = rdev->constraints->input_uV; |
668 | if (input_uV <= 0) | |
669 | return; | |
670 | ||
671 | /* calc total requested load */ | |
672 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 673 | current_uA += sibling->uA_load; |
414c70cb LG |
674 | |
675 | /* now get the optimum mode for our new total regulator load */ | |
676 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
677 | output_uV, current_uA); | |
678 | ||
679 | /* check the new mode is allowed */ | |
2c608234 | 680 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
681 | if (err == 0) |
682 | rdev->desc->ops->set_mode(rdev, mode); | |
683 | } | |
684 | ||
685 | static int suspend_set_state(struct regulator_dev *rdev, | |
686 | struct regulator_state *rstate) | |
687 | { | |
688 | int ret = 0; | |
638f85c5 MB |
689 | |
690 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
691 | * only warn if the driver implements set_suspend_voltage or |
692 | * set_suspend_mode callback. | |
638f85c5 MB |
693 | */ |
694 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
695 | if (rdev->desc->ops->set_suspend_voltage || |
696 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 697 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
698 | return 0; |
699 | } | |
700 | ||
701 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 702 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
703 | return -EINVAL; |
704 | } | |
414c70cb | 705 | |
8ac0e95d | 706 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 707 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 708 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 709 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
710 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
711 | ret = 0; | |
712 | ||
414c70cb | 713 | if (ret < 0) { |
5da84fd9 | 714 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
715 | return ret; |
716 | } | |
717 | ||
718 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
719 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
720 | if (ret < 0) { | |
5da84fd9 | 721 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
722 | return ret; |
723 | } | |
724 | } | |
725 | ||
726 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
727 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
728 | if (ret < 0) { | |
5da84fd9 | 729 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
730 | return ret; |
731 | } | |
732 | } | |
733 | return ret; | |
734 | } | |
735 | ||
736 | /* locks held by caller */ | |
737 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
738 | { | |
739 | if (!rdev->constraints) | |
740 | return -EINVAL; | |
741 | ||
742 | switch (state) { | |
743 | case PM_SUSPEND_STANDBY: | |
744 | return suspend_set_state(rdev, | |
745 | &rdev->constraints->state_standby); | |
746 | case PM_SUSPEND_MEM: | |
747 | return suspend_set_state(rdev, | |
748 | &rdev->constraints->state_mem); | |
749 | case PM_SUSPEND_MAX: | |
750 | return suspend_set_state(rdev, | |
751 | &rdev->constraints->state_disk); | |
752 | default: | |
753 | return -EINVAL; | |
754 | } | |
755 | } | |
756 | ||
757 | static void print_constraints(struct regulator_dev *rdev) | |
758 | { | |
759 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 760 | char buf[80] = ""; |
8f031b48 MB |
761 | int count = 0; |
762 | int ret; | |
414c70cb | 763 | |
8f031b48 | 764 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 765 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
766 | count += sprintf(buf + count, "%d mV ", |
767 | constraints->min_uV / 1000); | |
414c70cb | 768 | else |
8f031b48 MB |
769 | count += sprintf(buf + count, "%d <--> %d mV ", |
770 | constraints->min_uV / 1000, | |
771 | constraints->max_uV / 1000); | |
772 | } | |
773 | ||
774 | if (!constraints->min_uV || | |
775 | constraints->min_uV != constraints->max_uV) { | |
776 | ret = _regulator_get_voltage(rdev); | |
777 | if (ret > 0) | |
778 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
779 | } | |
780 | ||
bf5892a8 MB |
781 | if (constraints->uV_offset) |
782 | count += sprintf(buf, "%dmV offset ", | |
783 | constraints->uV_offset / 1000); | |
784 | ||
8f031b48 | 785 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 786 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
787 | count += sprintf(buf + count, "%d mA ", |
788 | constraints->min_uA / 1000); | |
414c70cb | 789 | else |
8f031b48 MB |
790 | count += sprintf(buf + count, "%d <--> %d mA ", |
791 | constraints->min_uA / 1000, | |
792 | constraints->max_uA / 1000); | |
793 | } | |
794 | ||
795 | if (!constraints->min_uA || | |
796 | constraints->min_uA != constraints->max_uA) { | |
797 | ret = _regulator_get_current_limit(rdev); | |
798 | if (ret > 0) | |
e4a6376b | 799 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 800 | } |
8f031b48 | 801 | |
414c70cb LG |
802 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
803 | count += sprintf(buf + count, "fast "); | |
804 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
805 | count += sprintf(buf + count, "normal "); | |
806 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
807 | count += sprintf(buf + count, "idle "); | |
808 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
809 | count += sprintf(buf + count, "standby"); | |
810 | ||
13ce29f8 | 811 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
812 | |
813 | if ((constraints->min_uV != constraints->max_uV) && | |
814 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
815 | rdev_warn(rdev, | |
816 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
817 | } |
818 | ||
e79055d6 | 819 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 820 | struct regulation_constraints *constraints) |
a5766f11 | 821 | { |
e5fda26c | 822 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
823 | int ret; |
824 | ||
825 | /* do we need to apply the constraint voltage */ | |
826 | if (rdev->constraints->apply_uV && | |
75790251 MB |
827 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
828 | ret = _regulator_do_set_voltage(rdev, | |
829 | rdev->constraints->min_uV, | |
830 | rdev->constraints->max_uV); | |
831 | if (ret < 0) { | |
832 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
833 | rdev->constraints->min_uV); | |
75790251 MB |
834 | return ret; |
835 | } | |
af5866c9 | 836 | } |
e06f5b4f | 837 | |
4367cfdc DB |
838 | /* constrain machine-level voltage specs to fit |
839 | * the actual range supported by this regulator. | |
840 | */ | |
841 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
842 | int count = rdev->desc->n_voltages; | |
843 | int i; | |
844 | int min_uV = INT_MAX; | |
845 | int max_uV = INT_MIN; | |
846 | int cmin = constraints->min_uV; | |
847 | int cmax = constraints->max_uV; | |
848 | ||
3e590918 MB |
849 | /* it's safe to autoconfigure fixed-voltage supplies |
850 | and the constraints are used by list_voltage. */ | |
4367cfdc | 851 | if (count == 1 && !cmin) { |
3e590918 | 852 | cmin = 1; |
4367cfdc | 853 | cmax = INT_MAX; |
3e590918 MB |
854 | constraints->min_uV = cmin; |
855 | constraints->max_uV = cmax; | |
4367cfdc DB |
856 | } |
857 | ||
3e2b9abd MB |
858 | /* voltage constraints are optional */ |
859 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 860 | return 0; |
3e2b9abd | 861 | |
4367cfdc | 862 | /* else require explicit machine-level constraints */ |
3e2b9abd | 863 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 864 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 865 | return -EINVAL; |
4367cfdc DB |
866 | } |
867 | ||
868 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
869 | for (i = 0; i < count; i++) { | |
870 | int value; | |
871 | ||
872 | value = ops->list_voltage(rdev, i); | |
873 | if (value <= 0) | |
874 | continue; | |
875 | ||
876 | /* maybe adjust [min_uV..max_uV] */ | |
877 | if (value >= cmin && value < min_uV) | |
878 | min_uV = value; | |
879 | if (value <= cmax && value > max_uV) | |
880 | max_uV = value; | |
881 | } | |
882 | ||
883 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
884 | if (max_uV < min_uV) { | |
5da84fd9 | 885 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 886 | return -EINVAL; |
4367cfdc DB |
887 | } |
888 | ||
889 | /* use regulator's subset of machine constraints */ | |
890 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
891 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
892 | constraints->min_uV, min_uV); | |
4367cfdc DB |
893 | constraints->min_uV = min_uV; |
894 | } | |
895 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
896 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
897 | constraints->max_uV, max_uV); | |
4367cfdc DB |
898 | constraints->max_uV = max_uV; |
899 | } | |
900 | } | |
901 | ||
e79055d6 MB |
902 | return 0; |
903 | } | |
904 | ||
905 | /** | |
906 | * set_machine_constraints - sets regulator constraints | |
907 | * @rdev: regulator source | |
908 | * @constraints: constraints to apply | |
909 | * | |
910 | * Allows platform initialisation code to define and constrain | |
911 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
912 | * Constraints *must* be set by platform code in order for some | |
913 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
914 | * set_mode. | |
915 | */ | |
916 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 917 | const struct regulation_constraints *constraints) |
e79055d6 MB |
918 | { |
919 | int ret = 0; | |
e79055d6 MB |
920 | struct regulator_ops *ops = rdev->desc->ops; |
921 | ||
9a8f5e07 MB |
922 | if (constraints) |
923 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
924 | GFP_KERNEL); | |
925 | else | |
926 | rdev->constraints = kzalloc(sizeof(*constraints), | |
927 | GFP_KERNEL); | |
f8c12fe3 MB |
928 | if (!rdev->constraints) |
929 | return -ENOMEM; | |
af5866c9 | 930 | |
f8c12fe3 | 931 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
932 | if (ret != 0) |
933 | goto out; | |
934 | ||
a5766f11 | 935 | /* do we need to setup our suspend state */ |
9a8f5e07 | 936 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 937 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 938 | if (ret < 0) { |
5da84fd9 | 939 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
940 | goto out; |
941 | } | |
942 | } | |
a5766f11 | 943 | |
9a8f5e07 | 944 | if (rdev->constraints->initial_mode) { |
a308466c | 945 | if (!ops->set_mode) { |
5da84fd9 | 946 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
947 | ret = -EINVAL; |
948 | goto out; | |
949 | } | |
950 | ||
f8c12fe3 | 951 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 952 | if (ret < 0) { |
5da84fd9 | 953 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
954 | goto out; |
955 | } | |
956 | } | |
957 | ||
cacf90f2 MB |
958 | /* If the constraints say the regulator should be on at this point |
959 | * and we have control then make sure it is enabled. | |
960 | */ | |
f8c12fe3 MB |
961 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
962 | ops->enable) { | |
e5fda26c MB |
963 | ret = ops->enable(rdev); |
964 | if (ret < 0) { | |
5da84fd9 | 965 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
966 | goto out; |
967 | } | |
968 | } | |
969 | ||
a5766f11 | 970 | print_constraints(rdev); |
1a6958e7 | 971 | return 0; |
a5766f11 | 972 | out: |
1a6958e7 AL |
973 | kfree(rdev->constraints); |
974 | rdev->constraints = NULL; | |
a5766f11 LG |
975 | return ret; |
976 | } | |
977 | ||
978 | /** | |
979 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
980 | * @rdev: regulator name |
981 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
982 | * |
983 | * Called by platform initialisation code to set the supply regulator for this | |
984 | * regulator. This ensures that a regulators supply will also be enabled by the | |
985 | * core if it's child is enabled. | |
986 | */ | |
987 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 988 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
989 | { |
990 | int err; | |
991 | ||
3801b86a MB |
992 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
993 | ||
994 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
995 | if (rdev->supply == NULL) { |
996 | err = -ENOMEM; | |
3801b86a | 997 | return err; |
a5766f11 | 998 | } |
3801b86a MB |
999 | |
1000 | return 0; | |
a5766f11 LG |
1001 | } |
1002 | ||
1003 | /** | |
06c63f93 | 1004 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1005 | * @rdev: regulator source |
40f9244f | 1006 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1007 | * @supply: symbolic name for supply |
a5766f11 LG |
1008 | * |
1009 | * Allows platform initialisation code to map physical regulator | |
1010 | * sources to symbolic names for supplies for use by devices. Devices | |
1011 | * should use these symbolic names to request regulators, avoiding the | |
1012 | * need to provide board-specific regulator names as platform data. | |
1013 | */ | |
1014 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1015 | const char *consumer_dev_name, |
1016 | const char *supply) | |
a5766f11 LG |
1017 | { |
1018 | struct regulator_map *node; | |
9ed2099e | 1019 | int has_dev; |
a5766f11 LG |
1020 | |
1021 | if (supply == NULL) | |
1022 | return -EINVAL; | |
1023 | ||
9ed2099e MB |
1024 | if (consumer_dev_name != NULL) |
1025 | has_dev = 1; | |
1026 | else | |
1027 | has_dev = 0; | |
1028 | ||
6001e13c | 1029 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1030 | if (node->dev_name && consumer_dev_name) { |
1031 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1032 | continue; | |
1033 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1034 | continue; |
23b5cc2a JN |
1035 | } |
1036 | ||
6001e13c DB |
1037 | if (strcmp(node->supply, supply) != 0) |
1038 | continue; | |
1039 | ||
737f360d MB |
1040 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1041 | consumer_dev_name, | |
1042 | dev_name(&node->regulator->dev), | |
1043 | node->regulator->desc->name, | |
1044 | supply, | |
1045 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1046 | return -EBUSY; |
1047 | } | |
1048 | ||
9ed2099e | 1049 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1050 | if (node == NULL) |
1051 | return -ENOMEM; | |
1052 | ||
1053 | node->regulator = rdev; | |
a5766f11 LG |
1054 | node->supply = supply; |
1055 | ||
9ed2099e MB |
1056 | if (has_dev) { |
1057 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1058 | if (node->dev_name == NULL) { | |
1059 | kfree(node); | |
1060 | return -ENOMEM; | |
1061 | } | |
40f9244f MB |
1062 | } |
1063 | ||
a5766f11 LG |
1064 | list_add(&node->list, ®ulator_map_list); |
1065 | return 0; | |
1066 | } | |
1067 | ||
0f1d747b MR |
1068 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1069 | { | |
1070 | struct regulator_map *node, *n; | |
1071 | ||
1072 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1073 | if (rdev == node->regulator) { | |
1074 | list_del(&node->list); | |
40f9244f | 1075 | kfree(node->dev_name); |
0f1d747b | 1076 | kfree(node); |
0f1d747b MR |
1077 | } |
1078 | } | |
1079 | } | |
1080 | ||
f5726ae3 | 1081 | #define REG_STR_SIZE 64 |
414c70cb LG |
1082 | |
1083 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1084 | struct device *dev, | |
1085 | const char *supply_name) | |
1086 | { | |
1087 | struct regulator *regulator; | |
1088 | char buf[REG_STR_SIZE]; | |
1089 | int err, size; | |
1090 | ||
1091 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1092 | if (regulator == NULL) | |
1093 | return NULL; | |
1094 | ||
1095 | mutex_lock(&rdev->mutex); | |
1096 | regulator->rdev = rdev; | |
1097 | list_add(®ulator->list, &rdev->consumer_list); | |
1098 | ||
1099 | if (dev) { | |
1100 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1101 | size = scnprintf(buf, REG_STR_SIZE, |
1102 | "microamps_requested_%s-%s", | |
1103 | dev_name(dev), supply_name); | |
414c70cb LG |
1104 | if (size >= REG_STR_SIZE) |
1105 | goto overflow_err; | |
1106 | ||
1107 | regulator->dev = dev; | |
4f26a2ab | 1108 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1109 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1110 | if (regulator->dev_attr.attr.name == NULL) | |
1111 | goto attr_name_err; | |
1112 | ||
414c70cb LG |
1113 | regulator->dev_attr.attr.mode = 0444; |
1114 | regulator->dev_attr.show = device_requested_uA_show; | |
1115 | err = device_create_file(dev, ®ulator->dev_attr); | |
1116 | if (err < 0) { | |
5da84fd9 | 1117 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1118 | goto attr_name_err; |
1119 | } | |
1120 | ||
1121 | /* also add a link to the device sysfs entry */ | |
1122 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1123 | dev->kobj.name, supply_name); | |
1124 | if (size >= REG_STR_SIZE) | |
1125 | goto attr_err; | |
1126 | ||
1127 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1128 | if (regulator->supply_name == NULL) | |
1129 | goto attr_err; | |
1130 | ||
1131 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1132 | buf); | |
1133 | if (err) { | |
5da84fd9 JP |
1134 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1135 | dev->kobj.name, err); | |
414c70cb LG |
1136 | goto link_name_err; |
1137 | } | |
5de70519 MB |
1138 | } else { |
1139 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1140 | if (regulator->supply_name == NULL) | |
1141 | goto attr_err; | |
1142 | } | |
1143 | ||
5de70519 MB |
1144 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1145 | rdev->debugfs); | |
24751434 | 1146 | if (!regulator->debugfs) { |
5de70519 | 1147 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1148 | } else { |
1149 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1150 | ®ulator->uA_load); | |
1151 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1152 | ®ulator->min_uV); | |
1153 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1154 | ®ulator->max_uV); | |
414c70cb | 1155 | } |
5de70519 | 1156 | |
6492bc1b MB |
1157 | /* |
1158 | * Check now if the regulator is an always on regulator - if | |
1159 | * it is then we don't need to do nearly so much work for | |
1160 | * enable/disable calls. | |
1161 | */ | |
1162 | if (!_regulator_can_change_status(rdev) && | |
1163 | _regulator_is_enabled(rdev)) | |
1164 | regulator->always_on = true; | |
1165 | ||
414c70cb LG |
1166 | mutex_unlock(&rdev->mutex); |
1167 | return regulator; | |
1168 | link_name_err: | |
1169 | kfree(regulator->supply_name); | |
1170 | attr_err: | |
1171 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1172 | attr_name_err: | |
1173 | kfree(regulator->dev_attr.attr.name); | |
1174 | overflow_err: | |
1175 | list_del(®ulator->list); | |
1176 | kfree(regulator); | |
1177 | mutex_unlock(&rdev->mutex); | |
1178 | return NULL; | |
1179 | } | |
1180 | ||
31aae2be MB |
1181 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1182 | { | |
1183 | if (!rdev->desc->ops->enable_time) | |
1184 | return 0; | |
1185 | return rdev->desc->ops->enable_time(rdev); | |
1186 | } | |
1187 | ||
69511a45 | 1188 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1189 | const char *supply, |
1190 | int *ret) | |
69511a45 RN |
1191 | { |
1192 | struct regulator_dev *r; | |
1193 | struct device_node *node; | |
576ca436 MB |
1194 | struct regulator_map *map; |
1195 | const char *devname = NULL; | |
69511a45 RN |
1196 | |
1197 | /* first do a dt based lookup */ | |
1198 | if (dev && dev->of_node) { | |
1199 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1200 | if (node) { |
69511a45 RN |
1201 | list_for_each_entry(r, ®ulator_list, list) |
1202 | if (r->dev.parent && | |
1203 | node == r->dev.of_node) | |
1204 | return r; | |
6d191a5f MB |
1205 | } else { |
1206 | /* | |
1207 | * If we couldn't even get the node then it's | |
1208 | * not just that the device didn't register | |
1209 | * yet, there's no node and we'll never | |
1210 | * succeed. | |
1211 | */ | |
1212 | *ret = -ENODEV; | |
1213 | } | |
69511a45 RN |
1214 | } |
1215 | ||
1216 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1217 | if (dev) |
1218 | devname = dev_name(dev); | |
1219 | ||
69511a45 RN |
1220 | list_for_each_entry(r, ®ulator_list, list) |
1221 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1222 | return r; | |
1223 | ||
576ca436 MB |
1224 | list_for_each_entry(map, ®ulator_map_list, list) { |
1225 | /* If the mapping has a device set up it must match */ | |
1226 | if (map->dev_name && | |
1227 | (!devname || strcmp(map->dev_name, devname))) | |
1228 | continue; | |
1229 | ||
1230 | if (strcmp(map->supply, supply) == 0) | |
1231 | return map->regulator; | |
1232 | } | |
1233 | ||
1234 | ||
69511a45 RN |
1235 | return NULL; |
1236 | } | |
1237 | ||
5ffbd136 MB |
1238 | /* Internal regulator request function */ |
1239 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1240 | int exclusive) | |
414c70cb LG |
1241 | { |
1242 | struct regulator_dev *rdev; | |
04bf3011 | 1243 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1244 | const char *devname = NULL; |
5ffbd136 | 1245 | int ret; |
414c70cb LG |
1246 | |
1247 | if (id == NULL) { | |
5da84fd9 | 1248 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1249 | return regulator; |
1250 | } | |
1251 | ||
40f9244f MB |
1252 | if (dev) |
1253 | devname = dev_name(dev); | |
1254 | ||
414c70cb LG |
1255 | mutex_lock(®ulator_list_mutex); |
1256 | ||
6d191a5f | 1257 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1258 | if (rdev) |
1259 | goto found; | |
1260 | ||
688fe99a MB |
1261 | if (board_wants_dummy_regulator) { |
1262 | rdev = dummy_regulator_rdev; | |
1263 | goto found; | |
1264 | } | |
1265 | ||
34abbd68 MB |
1266 | #ifdef CONFIG_REGULATOR_DUMMY |
1267 | if (!devname) | |
1268 | devname = "deviceless"; | |
1269 | ||
1270 | /* If the board didn't flag that it was fully constrained then | |
1271 | * substitute in a dummy regulator so consumers can continue. | |
1272 | */ | |
1273 | if (!has_full_constraints) { | |
5da84fd9 JP |
1274 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1275 | devname, id); | |
34abbd68 MB |
1276 | rdev = dummy_regulator_rdev; |
1277 | goto found; | |
1278 | } | |
1279 | #endif | |
1280 | ||
414c70cb LG |
1281 | mutex_unlock(®ulator_list_mutex); |
1282 | return regulator; | |
1283 | ||
1284 | found: | |
5ffbd136 MB |
1285 | if (rdev->exclusive) { |
1286 | regulator = ERR_PTR(-EPERM); | |
1287 | goto out; | |
1288 | } | |
1289 | ||
1290 | if (exclusive && rdev->open_count) { | |
1291 | regulator = ERR_PTR(-EBUSY); | |
1292 | goto out; | |
1293 | } | |
1294 | ||
a5766f11 LG |
1295 | if (!try_module_get(rdev->owner)) |
1296 | goto out; | |
1297 | ||
414c70cb LG |
1298 | regulator = create_regulator(rdev, dev, id); |
1299 | if (regulator == NULL) { | |
1300 | regulator = ERR_PTR(-ENOMEM); | |
1301 | module_put(rdev->owner); | |
bcda4321 | 1302 | goto out; |
414c70cb LG |
1303 | } |
1304 | ||
5ffbd136 MB |
1305 | rdev->open_count++; |
1306 | if (exclusive) { | |
1307 | rdev->exclusive = 1; | |
1308 | ||
1309 | ret = _regulator_is_enabled(rdev); | |
1310 | if (ret > 0) | |
1311 | rdev->use_count = 1; | |
1312 | else | |
1313 | rdev->use_count = 0; | |
1314 | } | |
1315 | ||
a5766f11 | 1316 | out: |
414c70cb | 1317 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1318 | |
414c70cb LG |
1319 | return regulator; |
1320 | } | |
5ffbd136 MB |
1321 | |
1322 | /** | |
1323 | * regulator_get - lookup and obtain a reference to a regulator. | |
1324 | * @dev: device for regulator "consumer" | |
1325 | * @id: Supply name or regulator ID. | |
1326 | * | |
1327 | * Returns a struct regulator corresponding to the regulator producer, | |
1328 | * or IS_ERR() condition containing errno. | |
1329 | * | |
1330 | * Use of supply names configured via regulator_set_device_supply() is | |
1331 | * strongly encouraged. It is recommended that the supply name used | |
1332 | * should match the name used for the supply and/or the relevant | |
1333 | * device pins in the datasheet. | |
1334 | */ | |
1335 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1336 | { | |
1337 | return _regulator_get(dev, id, 0); | |
1338 | } | |
414c70cb LG |
1339 | EXPORT_SYMBOL_GPL(regulator_get); |
1340 | ||
070b9079 SB |
1341 | static void devm_regulator_release(struct device *dev, void *res) |
1342 | { | |
1343 | regulator_put(*(struct regulator **)res); | |
1344 | } | |
1345 | ||
1346 | /** | |
1347 | * devm_regulator_get - Resource managed regulator_get() | |
1348 | * @dev: device for regulator "consumer" | |
1349 | * @id: Supply name or regulator ID. | |
1350 | * | |
1351 | * Managed regulator_get(). Regulators returned from this function are | |
1352 | * automatically regulator_put() on driver detach. See regulator_get() for more | |
1353 | * information. | |
1354 | */ | |
1355 | struct regulator *devm_regulator_get(struct device *dev, const char *id) | |
1356 | { | |
1357 | struct regulator **ptr, *regulator; | |
1358 | ||
1359 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1360 | if (!ptr) | |
1361 | return ERR_PTR(-ENOMEM); | |
1362 | ||
1363 | regulator = regulator_get(dev, id); | |
1364 | if (!IS_ERR(regulator)) { | |
1365 | *ptr = regulator; | |
1366 | devres_add(dev, ptr); | |
1367 | } else { | |
1368 | devres_free(ptr); | |
1369 | } | |
1370 | ||
1371 | return regulator; | |
1372 | } | |
1373 | EXPORT_SYMBOL_GPL(devm_regulator_get); | |
1374 | ||
5ffbd136 MB |
1375 | /** |
1376 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1377 | * @dev: device for regulator "consumer" | |
1378 | * @id: Supply name or regulator ID. | |
1379 | * | |
1380 | * Returns a struct regulator corresponding to the regulator producer, | |
1381 | * or IS_ERR() condition containing errno. Other consumers will be | |
1382 | * unable to obtain this reference is held and the use count for the | |
1383 | * regulator will be initialised to reflect the current state of the | |
1384 | * regulator. | |
1385 | * | |
1386 | * This is intended for use by consumers which cannot tolerate shared | |
1387 | * use of the regulator such as those which need to force the | |
1388 | * regulator off for correct operation of the hardware they are | |
1389 | * controlling. | |
1390 | * | |
1391 | * Use of supply names configured via regulator_set_device_supply() is | |
1392 | * strongly encouraged. It is recommended that the supply name used | |
1393 | * should match the name used for the supply and/or the relevant | |
1394 | * device pins in the datasheet. | |
1395 | */ | |
1396 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1397 | { | |
1398 | return _regulator_get(dev, id, 1); | |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1401 | ||
414c70cb LG |
1402 | /** |
1403 | * regulator_put - "free" the regulator source | |
1404 | * @regulator: regulator source | |
1405 | * | |
1406 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1407 | * regulator source are balanced by regulator_disable calls prior to calling | |
1408 | * this function. | |
1409 | */ | |
1410 | void regulator_put(struct regulator *regulator) | |
1411 | { | |
1412 | struct regulator_dev *rdev; | |
1413 | ||
1414 | if (regulator == NULL || IS_ERR(regulator)) | |
1415 | return; | |
1416 | ||
414c70cb LG |
1417 | mutex_lock(®ulator_list_mutex); |
1418 | rdev = regulator->rdev; | |
1419 | ||
5de70519 | 1420 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1421 | |
414c70cb LG |
1422 | /* remove any sysfs entries */ |
1423 | if (regulator->dev) { | |
1424 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
414c70cb LG |
1425 | device_remove_file(regulator->dev, ®ulator->dev_attr); |
1426 | kfree(regulator->dev_attr.attr.name); | |
1427 | } | |
5de70519 | 1428 | kfree(regulator->supply_name); |
414c70cb LG |
1429 | list_del(®ulator->list); |
1430 | kfree(regulator); | |
1431 | ||
5ffbd136 MB |
1432 | rdev->open_count--; |
1433 | rdev->exclusive = 0; | |
1434 | ||
414c70cb LG |
1435 | module_put(rdev->owner); |
1436 | mutex_unlock(®ulator_list_mutex); | |
1437 | } | |
1438 | EXPORT_SYMBOL_GPL(regulator_put); | |
1439 | ||
d5ad34f7 MB |
1440 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1441 | { | |
1442 | struct regulator **r = res; | |
1443 | if (!r || !*r) { | |
1444 | WARN_ON(!r || !*r); | |
1445 | return 0; | |
1446 | } | |
1447 | return *r == data; | |
1448 | } | |
1449 | ||
1450 | /** | |
1451 | * devm_regulator_put - Resource managed regulator_put() | |
1452 | * @regulator: regulator to free | |
1453 | * | |
1454 | * Deallocate a regulator allocated with devm_regulator_get(). Normally | |
1455 | * this function will not need to be called and the resource management | |
1456 | * code will ensure that the resource is freed. | |
1457 | */ | |
1458 | void devm_regulator_put(struct regulator *regulator) | |
1459 | { | |
1460 | int rc; | |
1461 | ||
1462 | rc = devres_destroy(regulator->dev, devm_regulator_release, | |
1463 | devm_regulator_match, regulator); | |
968c2c17 MB |
1464 | if (rc == 0) |
1465 | regulator_put(regulator); | |
1466 | else | |
1467 | WARN_ON(rc); | |
d5ad34f7 MB |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(devm_regulator_put); | |
1470 | ||
414c70cb LG |
1471 | /* locks held by regulator_enable() */ |
1472 | static int _regulator_enable(struct regulator_dev *rdev) | |
1473 | { | |
31aae2be | 1474 | int ret, delay; |
414c70cb | 1475 | |
414c70cb | 1476 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1477 | if (rdev->constraints && |
1478 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1479 | drms_uA_update(rdev); | |
414c70cb | 1480 | |
9a2372fa MB |
1481 | if (rdev->use_count == 0) { |
1482 | /* The regulator may on if it's not switchable or left on */ | |
1483 | ret = _regulator_is_enabled(rdev); | |
1484 | if (ret == -EINVAL || ret == 0) { | |
1485 | if (!_regulator_can_change_status(rdev)) | |
1486 | return -EPERM; | |
1487 | ||
31aae2be | 1488 | if (!rdev->desc->ops->enable) |
9a2372fa | 1489 | return -EINVAL; |
31aae2be MB |
1490 | |
1491 | /* Query before enabling in case configuration | |
25985edc | 1492 | * dependent. */ |
31aae2be MB |
1493 | ret = _regulator_get_enable_time(rdev); |
1494 | if (ret >= 0) { | |
1495 | delay = ret; | |
1496 | } else { | |
5da84fd9 | 1497 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1498 | ret); |
31aae2be | 1499 | delay = 0; |
9a2372fa | 1500 | } |
31aae2be | 1501 | |
02fa3ec0 MB |
1502 | trace_regulator_enable(rdev_get_name(rdev)); |
1503 | ||
31aae2be MB |
1504 | /* Allow the regulator to ramp; it would be useful |
1505 | * to extend this for bulk operations so that the | |
1506 | * regulators can ramp together. */ | |
1507 | ret = rdev->desc->ops->enable(rdev); | |
1508 | if (ret < 0) | |
1509 | return ret; | |
1510 | ||
02fa3ec0 MB |
1511 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1512 | ||
e36c1df8 | 1513 | if (delay >= 1000) { |
31aae2be | 1514 | mdelay(delay / 1000); |
e36c1df8 AL |
1515 | udelay(delay % 1000); |
1516 | } else if (delay) { | |
31aae2be | 1517 | udelay(delay); |
e36c1df8 | 1518 | } |
31aae2be | 1519 | |
02fa3ec0 MB |
1520 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1521 | ||
a7433cff | 1522 | } else if (ret < 0) { |
5da84fd9 | 1523 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1524 | return ret; |
1525 | } | |
a7433cff | 1526 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1527 | } |
1528 | ||
9a2372fa MB |
1529 | rdev->use_count++; |
1530 | ||
1531 | return 0; | |
414c70cb LG |
1532 | } |
1533 | ||
1534 | /** | |
1535 | * regulator_enable - enable regulator output | |
1536 | * @regulator: regulator source | |
1537 | * | |
cf7bbcdf MB |
1538 | * Request that the regulator be enabled with the regulator output at |
1539 | * the predefined voltage or current value. Calls to regulator_enable() | |
1540 | * must be balanced with calls to regulator_disable(). | |
1541 | * | |
414c70cb | 1542 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1543 | * hardwired in the regulator. |
414c70cb LG |
1544 | */ |
1545 | int regulator_enable(struct regulator *regulator) | |
1546 | { | |
412aec61 DB |
1547 | struct regulator_dev *rdev = regulator->rdev; |
1548 | int ret = 0; | |
414c70cb | 1549 | |
6492bc1b MB |
1550 | if (regulator->always_on) |
1551 | return 0; | |
1552 | ||
3801b86a MB |
1553 | if (rdev->supply) { |
1554 | ret = regulator_enable(rdev->supply); | |
1555 | if (ret != 0) | |
1556 | return ret; | |
1557 | } | |
1558 | ||
412aec61 | 1559 | mutex_lock(&rdev->mutex); |
cd94b505 | 1560 | ret = _regulator_enable(rdev); |
412aec61 | 1561 | mutex_unlock(&rdev->mutex); |
3801b86a | 1562 | |
d1685e4e | 1563 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1564 | regulator_disable(rdev->supply); |
1565 | ||
414c70cb LG |
1566 | return ret; |
1567 | } | |
1568 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1569 | ||
1570 | /* locks held by regulator_disable() */ | |
3801b86a | 1571 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1572 | { |
1573 | int ret = 0; | |
1574 | ||
cd94b505 | 1575 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1576 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1577 | return -EIO; |
1578 | ||
414c70cb | 1579 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1580 | if (rdev->use_count == 1 && |
1581 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1582 | |
1583 | /* we are last user */ | |
9a2372fa MB |
1584 | if (_regulator_can_change_status(rdev) && |
1585 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1586 | trace_regulator_disable(rdev_get_name(rdev)); |
1587 | ||
414c70cb LG |
1588 | ret = rdev->desc->ops->disable(rdev); |
1589 | if (ret < 0) { | |
5da84fd9 | 1590 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1591 | return ret; |
1592 | } | |
84b68263 | 1593 | |
02fa3ec0 MB |
1594 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1595 | ||
84b68263 MB |
1596 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1597 | NULL); | |
414c70cb LG |
1598 | } |
1599 | ||
414c70cb LG |
1600 | rdev->use_count = 0; |
1601 | } else if (rdev->use_count > 1) { | |
1602 | ||
1603 | if (rdev->constraints && | |
1604 | (rdev->constraints->valid_ops_mask & | |
1605 | REGULATOR_CHANGE_DRMS)) | |
1606 | drms_uA_update(rdev); | |
1607 | ||
1608 | rdev->use_count--; | |
1609 | } | |
3801b86a | 1610 | |
414c70cb LG |
1611 | return ret; |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * regulator_disable - disable regulator output | |
1616 | * @regulator: regulator source | |
1617 | * | |
cf7bbcdf MB |
1618 | * Disable the regulator output voltage or current. Calls to |
1619 | * regulator_enable() must be balanced with calls to | |
1620 | * regulator_disable(). | |
69279fb9 | 1621 | * |
414c70cb | 1622 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1623 | * devices have it enabled, the regulator device supports disabling and |
1624 | * machine constraints permit this operation. | |
414c70cb LG |
1625 | */ |
1626 | int regulator_disable(struct regulator *regulator) | |
1627 | { | |
412aec61 DB |
1628 | struct regulator_dev *rdev = regulator->rdev; |
1629 | int ret = 0; | |
414c70cb | 1630 | |
6492bc1b MB |
1631 | if (regulator->always_on) |
1632 | return 0; | |
1633 | ||
412aec61 | 1634 | mutex_lock(&rdev->mutex); |
3801b86a | 1635 | ret = _regulator_disable(rdev); |
412aec61 | 1636 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1637 | |
3801b86a MB |
1638 | if (ret == 0 && rdev->supply) |
1639 | regulator_disable(rdev->supply); | |
8cbf811d | 1640 | |
414c70cb LG |
1641 | return ret; |
1642 | } | |
1643 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1644 | ||
1645 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1646 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1647 | { |
1648 | int ret = 0; | |
1649 | ||
1650 | /* force disable */ | |
1651 | if (rdev->desc->ops->disable) { | |
1652 | /* ah well, who wants to live forever... */ | |
1653 | ret = rdev->desc->ops->disable(rdev); | |
1654 | if (ret < 0) { | |
5da84fd9 | 1655 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1656 | return ret; |
1657 | } | |
1658 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1659 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1660 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1661 | } |
1662 | ||
414c70cb LG |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | /** | |
1667 | * regulator_force_disable - force disable regulator output | |
1668 | * @regulator: regulator source | |
1669 | * | |
1670 | * Forcibly disable the regulator output voltage or current. | |
1671 | * NOTE: this *will* disable the regulator output even if other consumer | |
1672 | * devices have it enabled. This should be used for situations when device | |
1673 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1674 | */ | |
1675 | int regulator_force_disable(struct regulator *regulator) | |
1676 | { | |
82d15839 | 1677 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1678 | int ret; |
1679 | ||
82d15839 | 1680 | mutex_lock(&rdev->mutex); |
414c70cb | 1681 | regulator->uA_load = 0; |
3801b86a | 1682 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1683 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1684 | |
3801b86a MB |
1685 | if (rdev->supply) |
1686 | while (rdev->open_count--) | |
1687 | regulator_disable(rdev->supply); | |
8cbf811d | 1688 | |
414c70cb LG |
1689 | return ret; |
1690 | } | |
1691 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1692 | ||
da07ecd9 MB |
1693 | static void regulator_disable_work(struct work_struct *work) |
1694 | { | |
1695 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1696 | disable_work.work); | |
1697 | int count, i, ret; | |
1698 | ||
1699 | mutex_lock(&rdev->mutex); | |
1700 | ||
1701 | BUG_ON(!rdev->deferred_disables); | |
1702 | ||
1703 | count = rdev->deferred_disables; | |
1704 | rdev->deferred_disables = 0; | |
1705 | ||
1706 | for (i = 0; i < count; i++) { | |
1707 | ret = _regulator_disable(rdev); | |
1708 | if (ret != 0) | |
1709 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1710 | } | |
1711 | ||
1712 | mutex_unlock(&rdev->mutex); | |
1713 | ||
1714 | if (rdev->supply) { | |
1715 | for (i = 0; i < count; i++) { | |
1716 | ret = regulator_disable(rdev->supply); | |
1717 | if (ret != 0) { | |
1718 | rdev_err(rdev, | |
1719 | "Supply disable failed: %d\n", ret); | |
1720 | } | |
1721 | } | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | /** | |
1726 | * regulator_disable_deferred - disable regulator output with delay | |
1727 | * @regulator: regulator source | |
1728 | * @ms: miliseconds until the regulator is disabled | |
1729 | * | |
1730 | * Execute regulator_disable() on the regulator after a delay. This | |
1731 | * is intended for use with devices that require some time to quiesce. | |
1732 | * | |
1733 | * NOTE: this will only disable the regulator output if no other consumer | |
1734 | * devices have it enabled, the regulator device supports disabling and | |
1735 | * machine constraints permit this operation. | |
1736 | */ | |
1737 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1738 | { | |
1739 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1740 | int ret; |
da07ecd9 | 1741 | |
6492bc1b MB |
1742 | if (regulator->always_on) |
1743 | return 0; | |
1744 | ||
da07ecd9 MB |
1745 | mutex_lock(&rdev->mutex); |
1746 | rdev->deferred_disables++; | |
1747 | mutex_unlock(&rdev->mutex); | |
1748 | ||
aa59802d MB |
1749 | ret = schedule_delayed_work(&rdev->disable_work, |
1750 | msecs_to_jiffies(ms)); | |
1751 | if (ret < 0) | |
1752 | return ret; | |
1753 | else | |
1754 | return 0; | |
da07ecd9 MB |
1755 | } |
1756 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1757 | ||
cd6dffb4 MB |
1758 | /** |
1759 | * regulator_is_enabled_regmap - standard is_enabled() for regmap users | |
1760 | * | |
1761 | * @rdev: regulator to operate on | |
1762 | * | |
1763 | * Regulators that use regmap for their register I/O can set the | |
1764 | * enable_reg and enable_mask fields in their descriptor and then use | |
1765 | * this as their is_enabled operation, saving some code. | |
1766 | */ | |
1767 | int regulator_is_enabled_regmap(struct regulator_dev *rdev) | |
1768 | { | |
1769 | unsigned int val; | |
1770 | int ret; | |
1771 | ||
1772 | ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); | |
1773 | if (ret != 0) | |
1774 | return ret; | |
1775 | ||
1776 | return (val & rdev->desc->enable_mask) != 0; | |
1777 | } | |
1778 | EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); | |
1779 | ||
1780 | /** | |
1781 | * regulator_enable_regmap - standard enable() for regmap users | |
1782 | * | |
1783 | * @rdev: regulator to operate on | |
1784 | * | |
1785 | * Regulators that use regmap for their register I/O can set the | |
1786 | * enable_reg and enable_mask fields in their descriptor and then use | |
1787 | * this as their enable() operation, saving some code. | |
1788 | */ | |
1789 | int regulator_enable_regmap(struct regulator_dev *rdev) | |
1790 | { | |
1791 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1792 | rdev->desc->enable_mask, | |
1793 | rdev->desc->enable_mask); | |
1794 | } | |
1795 | EXPORT_SYMBOL_GPL(regulator_enable_regmap); | |
1796 | ||
1797 | /** | |
1798 | * regulator_disable_regmap - standard disable() for regmap users | |
1799 | * | |
1800 | * @rdev: regulator to operate on | |
1801 | * | |
1802 | * Regulators that use regmap for their register I/O can set the | |
1803 | * enable_reg and enable_mask fields in their descriptor and then use | |
1804 | * this as their disable() operation, saving some code. | |
1805 | */ | |
1806 | int regulator_disable_regmap(struct regulator_dev *rdev) | |
1807 | { | |
1808 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1809 | rdev->desc->enable_mask, 0); | |
1810 | } | |
1811 | EXPORT_SYMBOL_GPL(regulator_disable_regmap); | |
1812 | ||
414c70cb LG |
1813 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1814 | { | |
9a7f6a4c | 1815 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1816 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1817 | return 1; |
414c70cb | 1818 | |
9332546f | 1819 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1820 | } |
1821 | ||
1822 | /** | |
1823 | * regulator_is_enabled - is the regulator output enabled | |
1824 | * @regulator: regulator source | |
1825 | * | |
412aec61 DB |
1826 | * Returns positive if the regulator driver backing the source/client |
1827 | * has requested that the device be enabled, zero if it hasn't, else a | |
1828 | * negative errno code. | |
1829 | * | |
1830 | * Note that the device backing this regulator handle can have multiple | |
1831 | * users, so it might be enabled even if regulator_enable() was never | |
1832 | * called for this particular source. | |
414c70cb LG |
1833 | */ |
1834 | int regulator_is_enabled(struct regulator *regulator) | |
1835 | { | |
9332546f MB |
1836 | int ret; |
1837 | ||
6492bc1b MB |
1838 | if (regulator->always_on) |
1839 | return 1; | |
1840 | ||
9332546f MB |
1841 | mutex_lock(®ulator->rdev->mutex); |
1842 | ret = _regulator_is_enabled(regulator->rdev); | |
1843 | mutex_unlock(®ulator->rdev->mutex); | |
1844 | ||
1845 | return ret; | |
414c70cb LG |
1846 | } |
1847 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1848 | ||
4367cfdc DB |
1849 | /** |
1850 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1851 | * @regulator: regulator source | |
1852 | * | |
1853 | * Returns number of selectors, or negative errno. Selectors are | |
1854 | * numbered starting at zero, and typically correspond to bitfields | |
1855 | * in hardware registers. | |
1856 | */ | |
1857 | int regulator_count_voltages(struct regulator *regulator) | |
1858 | { | |
1859 | struct regulator_dev *rdev = regulator->rdev; | |
1860 | ||
1861 | return rdev->desc->n_voltages ? : -EINVAL; | |
1862 | } | |
1863 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1864 | ||
bca7bbff MB |
1865 | /** |
1866 | * regulator_list_voltage_linear - List voltages with simple calculation | |
1867 | * | |
1868 | * @rdev: Regulator device | |
1869 | * @selector: Selector to convert into a voltage | |
1870 | * | |
1871 | * Regulators with a simple linear mapping between voltages and | |
1872 | * selectors can set min_uV and uV_step in the regulator descriptor | |
1873 | * and then use this function as their list_voltage() operation, | |
1874 | */ | |
1875 | int regulator_list_voltage_linear(struct regulator_dev *rdev, | |
1876 | unsigned int selector) | |
1877 | { | |
1878 | if (selector >= rdev->desc->n_voltages) | |
1879 | return -EINVAL; | |
1880 | ||
1881 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); | |
1882 | } | |
1883 | EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); | |
1884 | ||
4367cfdc DB |
1885 | /** |
1886 | * regulator_list_voltage - enumerate supported voltages | |
1887 | * @regulator: regulator source | |
1888 | * @selector: identify voltage to list | |
1889 | * Context: can sleep | |
1890 | * | |
1891 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1892 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1893 | * negative errno. |
1894 | */ | |
1895 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1896 | { | |
1897 | struct regulator_dev *rdev = regulator->rdev; | |
1898 | struct regulator_ops *ops = rdev->desc->ops; | |
1899 | int ret; | |
1900 | ||
1901 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1902 | return -EINVAL; | |
1903 | ||
1904 | mutex_lock(&rdev->mutex); | |
1905 | ret = ops->list_voltage(rdev, selector); | |
1906 | mutex_unlock(&rdev->mutex); | |
1907 | ||
1908 | if (ret > 0) { | |
1909 | if (ret < rdev->constraints->min_uV) | |
1910 | ret = 0; | |
1911 | else if (ret > rdev->constraints->max_uV) | |
1912 | ret = 0; | |
1913 | } | |
1914 | ||
1915 | return ret; | |
1916 | } | |
1917 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1918 | ||
a7a1ad90 MB |
1919 | /** |
1920 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1921 | * | |
1922 | * @regulator: Regulator to check. | |
1923 | * @min_uV: Minimum required voltage in uV. | |
1924 | * @max_uV: Maximum required voltage in uV. | |
1925 | * | |
1926 | * Returns a boolean or a negative error code. | |
1927 | */ | |
1928 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1929 | int min_uV, int max_uV) | |
1930 | { | |
1931 | int i, voltages, ret; | |
1932 | ||
1933 | ret = regulator_count_voltages(regulator); | |
1934 | if (ret < 0) | |
1935 | return ret; | |
1936 | voltages = ret; | |
1937 | ||
1938 | for (i = 0; i < voltages; i++) { | |
1939 | ret = regulator_list_voltage(regulator, i); | |
1940 | ||
1941 | if (ret >= min_uV && ret <= max_uV) | |
1942 | return 1; | |
1943 | } | |
1944 | ||
1945 | return 0; | |
1946 | } | |
a398eaa2 | 1947 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 1948 | |
4ab5b3d9 MB |
1949 | /** |
1950 | * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users | |
1951 | * | |
1952 | * @rdev: regulator to operate on | |
1953 | * | |
1954 | * Regulators that use regmap for their register I/O can set the | |
1955 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
1956 | * as their get_voltage_vsel operation, saving some code. | |
1957 | */ | |
1958 | int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) | |
1959 | { | |
1960 | unsigned int val; | |
1961 | int ret; | |
1962 | ||
1963 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
1964 | if (ret != 0) | |
1965 | return ret; | |
1966 | ||
1967 | val &= rdev->desc->vsel_mask; | |
1968 | val >>= ffs(rdev->desc->vsel_mask) - 1; | |
1969 | ||
1970 | return val; | |
1971 | } | |
1972 | EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); | |
1973 | ||
1974 | /** | |
1975 | * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users | |
1976 | * | |
1977 | * @rdev: regulator to operate on | |
1978 | * @sel: Selector to set | |
1979 | * | |
1980 | * Regulators that use regmap for their register I/O can set the | |
1981 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
1982 | * as their set_voltage_vsel operation, saving some code. | |
1983 | */ | |
1984 | int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) | |
1985 | { | |
1986 | sel <<= ffs(rdev->desc->vsel_mask) - 1; | |
1987 | ||
1988 | return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, | |
1989 | rdev->desc->vsel_mask, sel); | |
1990 | } | |
1991 | EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); | |
1992 | ||
e843fc46 MB |
1993 | /** |
1994 | * regulator_map_voltage_iterate - map_voltage() based on list_voltage() | |
1995 | * | |
1996 | * @rdev: Regulator to operate on | |
1997 | * @min_uV: Lower bound for voltage | |
1998 | * @max_uV: Upper bound for voltage | |
1999 | * | |
2000 | * Drivers implementing set_voltage_sel() and list_voltage() can use | |
2001 | * this as their map_voltage() operation. It will find a suitable | |
2002 | * voltage by calling list_voltage() until it gets something in bounds | |
2003 | * for the requested voltages. | |
2004 | */ | |
2005 | int regulator_map_voltage_iterate(struct regulator_dev *rdev, | |
2006 | int min_uV, int max_uV) | |
2007 | { | |
2008 | int best_val = INT_MAX; | |
2009 | int selector = 0; | |
2010 | int i, ret; | |
2011 | ||
2012 | /* Find the smallest voltage that falls within the specified | |
2013 | * range. | |
2014 | */ | |
2015 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2016 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
2017 | if (ret < 0) | |
2018 | continue; | |
2019 | ||
2020 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
2021 | best_val = ret; | |
2022 | selector = i; | |
2023 | } | |
2024 | } | |
2025 | ||
2026 | if (best_val != INT_MAX) | |
2027 | return selector; | |
2028 | else | |
2029 | return -EINVAL; | |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); | |
2032 | ||
bca7bbff MB |
2033 | /** |
2034 | * regulator_map_voltage_linear - map_voltage() for simple linear mappings | |
2035 | * | |
2036 | * @rdev: Regulator to operate on | |
2037 | * @min_uV: Lower bound for voltage | |
2038 | * @max_uV: Upper bound for voltage | |
2039 | * | |
2040 | * Drivers providing min_uV and uV_step in their regulator_desc can | |
2041 | * use this as their map_voltage() operation. | |
2042 | */ | |
2043 | int regulator_map_voltage_linear(struct regulator_dev *rdev, | |
2044 | int min_uV, int max_uV) | |
2045 | { | |
2046 | int ret, voltage; | |
2047 | ||
2048 | if (!rdev->desc->uV_step) { | |
2049 | BUG_ON(!rdev->desc->uV_step); | |
2050 | return -EINVAL; | |
2051 | } | |
2052 | ||
0bdc81e4 AL |
2053 | if (min_uV < rdev->desc->min_uV) |
2054 | min_uV = rdev->desc->min_uV; | |
2055 | ||
ccfcb1c3 | 2056 | ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
bca7bbff MB |
2057 | if (ret < 0) |
2058 | return ret; | |
2059 | ||
2060 | /* Map back into a voltage to verify we're still in bounds */ | |
2061 | voltage = rdev->desc->ops->list_voltage(rdev, ret); | |
2062 | if (voltage < min_uV || voltage > max_uV) | |
2063 | return -EINVAL; | |
2064 | ||
2065 | return ret; | |
2066 | } | |
2067 | EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); | |
2068 | ||
75790251 MB |
2069 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2070 | int min_uV, int max_uV) | |
2071 | { | |
2072 | int ret; | |
77af1b26 | 2073 | int delay = 0; |
e843fc46 | 2074 | int best_val; |
75790251 | 2075 | unsigned int selector; |
eba41a5e | 2076 | int old_selector = -1; |
75790251 MB |
2077 | |
2078 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2079 | ||
bf5892a8 MB |
2080 | min_uV += rdev->constraints->uV_offset; |
2081 | max_uV += rdev->constraints->uV_offset; | |
2082 | ||
eba41a5e AL |
2083 | /* |
2084 | * If we can't obtain the old selector there is not enough | |
2085 | * info to call set_voltage_time_sel(). | |
2086 | */ | |
2087 | if (rdev->desc->ops->set_voltage_time_sel && | |
2088 | rdev->desc->ops->get_voltage_sel) { | |
2089 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2090 | if (old_selector < 0) | |
2091 | return old_selector; | |
2092 | } | |
2093 | ||
75790251 MB |
2094 | if (rdev->desc->ops->set_voltage) { |
2095 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2096 | &selector); | |
e8eef82b | 2097 | } else if (rdev->desc->ops->set_voltage_sel) { |
e843fc46 MB |
2098 | if (rdev->desc->ops->map_voltage) |
2099 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, | |
2100 | max_uV); | |
2101 | else | |
2102 | ret = regulator_map_voltage_iterate(rdev, min_uV, | |
2103 | max_uV); | |
e8eef82b | 2104 | |
e843fc46 MB |
2105 | if (ret >= 0) { |
2106 | selector = ret; | |
2107 | ret = rdev->desc->ops->set_voltage_sel(rdev, ret); | |
e8eef82b | 2108 | } |
75790251 MB |
2109 | } else { |
2110 | ret = -EINVAL; | |
2111 | } | |
e8eef82b | 2112 | |
e843fc46 MB |
2113 | if (rdev->desc->ops->list_voltage) |
2114 | best_val = rdev->desc->ops->list_voltage(rdev, selector); | |
2115 | else | |
2116 | best_val = -1; | |
77af1b26 | 2117 | |
eba41a5e AL |
2118 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
2119 | if (ret == 0 && old_selector >= 0 && | |
2120 | rdev->desc->ops->set_voltage_time_sel) { | |
77af1b26 | 2121 | |
eba41a5e AL |
2122 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2123 | old_selector, selector); | |
2124 | if (delay < 0) { | |
2125 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2126 | delay); | |
2127 | delay = 0; | |
e8eef82b | 2128 | } |
75790251 MB |
2129 | } |
2130 | ||
77af1b26 LW |
2131 | /* Insert any necessary delays */ |
2132 | if (delay >= 1000) { | |
2133 | mdelay(delay / 1000); | |
2134 | udelay(delay % 1000); | |
2135 | } else if (delay) { | |
2136 | udelay(delay); | |
2137 | } | |
2138 | ||
ded06a52 MB |
2139 | if (ret == 0) |
2140 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
2141 | NULL); | |
2142 | ||
eba41a5e | 2143 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2144 | |
2145 | return ret; | |
2146 | } | |
2147 | ||
414c70cb LG |
2148 | /** |
2149 | * regulator_set_voltage - set regulator output voltage | |
2150 | * @regulator: regulator source | |
2151 | * @min_uV: Minimum required voltage in uV | |
2152 | * @max_uV: Maximum acceptable voltage in uV | |
2153 | * | |
2154 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2155 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2156 | * | |
2157 | * If the regulator is enabled then the voltage will change to the new value | |
2158 | * immediately otherwise if the regulator is disabled the regulator will | |
2159 | * output at the new voltage when enabled. | |
2160 | * | |
2161 | * NOTE: If the regulator is shared between several devices then the lowest | |
2162 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2163 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2164 | * calling this function otherwise this call will fail. |
2165 | */ | |
2166 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2167 | { | |
2168 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2169 | int ret = 0; |
414c70cb LG |
2170 | |
2171 | mutex_lock(&rdev->mutex); | |
2172 | ||
95a3c23a MB |
2173 | /* If we're setting the same range as last time the change |
2174 | * should be a noop (some cpufreq implementations use the same | |
2175 | * voltage for multiple frequencies, for example). | |
2176 | */ | |
2177 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2178 | goto out; | |
2179 | ||
414c70cb | 2180 | /* sanity check */ |
e8eef82b MB |
2181 | if (!rdev->desc->ops->set_voltage && |
2182 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2183 | ret = -EINVAL; |
2184 | goto out; | |
2185 | } | |
2186 | ||
2187 | /* constraints check */ | |
2188 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2189 | if (ret < 0) | |
2190 | goto out; | |
2191 | regulator->min_uV = min_uV; | |
2192 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2193 | |
05fda3b1 TP |
2194 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2195 | if (ret < 0) | |
2196 | goto out; | |
2197 | ||
75790251 | 2198 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 2199 | |
414c70cb LG |
2200 | out: |
2201 | mutex_unlock(&rdev->mutex); | |
2202 | return ret; | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2205 | ||
88cd222b LW |
2206 | /** |
2207 | * regulator_set_voltage_time - get raise/fall time | |
2208 | * @regulator: regulator source | |
2209 | * @old_uV: starting voltage in microvolts | |
2210 | * @new_uV: target voltage in microvolts | |
2211 | * | |
2212 | * Provided with the starting and ending voltage, this function attempts to | |
2213 | * calculate the time in microseconds required to rise or fall to this new | |
2214 | * voltage. | |
2215 | */ | |
2216 | int regulator_set_voltage_time(struct regulator *regulator, | |
2217 | int old_uV, int new_uV) | |
2218 | { | |
2219 | struct regulator_dev *rdev = regulator->rdev; | |
2220 | struct regulator_ops *ops = rdev->desc->ops; | |
2221 | int old_sel = -1; | |
2222 | int new_sel = -1; | |
2223 | int voltage; | |
2224 | int i; | |
2225 | ||
2226 | /* Currently requires operations to do this */ | |
2227 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2228 | || !rdev->desc->n_voltages) | |
2229 | return -EINVAL; | |
2230 | ||
2231 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2232 | /* We only look for exact voltage matches here */ | |
2233 | voltage = regulator_list_voltage(regulator, i); | |
2234 | if (voltage < 0) | |
2235 | return -EINVAL; | |
2236 | if (voltage == 0) | |
2237 | continue; | |
2238 | if (voltage == old_uV) | |
2239 | old_sel = i; | |
2240 | if (voltage == new_uV) | |
2241 | new_sel = i; | |
2242 | } | |
2243 | ||
2244 | if (old_sel < 0 || new_sel < 0) | |
2245 | return -EINVAL; | |
2246 | ||
2247 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2248 | } | |
2249 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2250 | ||
606a2562 MB |
2251 | /** |
2252 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2253 | * @regulator: regulator source | |
2254 | * | |
2255 | * Re-apply the last configured voltage. This is intended to be used | |
2256 | * where some external control source the consumer is cooperating with | |
2257 | * has caused the configured voltage to change. | |
2258 | */ | |
2259 | int regulator_sync_voltage(struct regulator *regulator) | |
2260 | { | |
2261 | struct regulator_dev *rdev = regulator->rdev; | |
2262 | int ret, min_uV, max_uV; | |
2263 | ||
2264 | mutex_lock(&rdev->mutex); | |
2265 | ||
2266 | if (!rdev->desc->ops->set_voltage && | |
2267 | !rdev->desc->ops->set_voltage_sel) { | |
2268 | ret = -EINVAL; | |
2269 | goto out; | |
2270 | } | |
2271 | ||
2272 | /* This is only going to work if we've had a voltage configured. */ | |
2273 | if (!regulator->min_uV && !regulator->max_uV) { | |
2274 | ret = -EINVAL; | |
2275 | goto out; | |
2276 | } | |
2277 | ||
2278 | min_uV = regulator->min_uV; | |
2279 | max_uV = regulator->max_uV; | |
2280 | ||
2281 | /* This should be a paranoia check... */ | |
2282 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2283 | if (ret < 0) | |
2284 | goto out; | |
2285 | ||
2286 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2287 | if (ret < 0) | |
2288 | goto out; | |
2289 | ||
2290 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2291 | ||
2292 | out: | |
2293 | mutex_unlock(&rdev->mutex); | |
2294 | return ret; | |
2295 | } | |
2296 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2297 | ||
414c70cb LG |
2298 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2299 | { | |
bf5892a8 | 2300 | int sel, ret; |
476c2d83 MB |
2301 | |
2302 | if (rdev->desc->ops->get_voltage_sel) { | |
2303 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2304 | if (sel < 0) | |
2305 | return sel; | |
bf5892a8 | 2306 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2307 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2308 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 2309 | } else { |
414c70cb | 2310 | return -EINVAL; |
cb220d16 | 2311 | } |
bf5892a8 | 2312 | |
cb220d16 AL |
2313 | if (ret < 0) |
2314 | return ret; | |
bf5892a8 | 2315 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2316 | } |
2317 | ||
2318 | /** | |
2319 | * regulator_get_voltage - get regulator output voltage | |
2320 | * @regulator: regulator source | |
2321 | * | |
2322 | * This returns the current regulator voltage in uV. | |
2323 | * | |
2324 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2325 | * function should not be used to determine regulator state. | |
2326 | */ | |
2327 | int regulator_get_voltage(struct regulator *regulator) | |
2328 | { | |
2329 | int ret; | |
2330 | ||
2331 | mutex_lock(®ulator->rdev->mutex); | |
2332 | ||
2333 | ret = _regulator_get_voltage(regulator->rdev); | |
2334 | ||
2335 | mutex_unlock(®ulator->rdev->mutex); | |
2336 | ||
2337 | return ret; | |
2338 | } | |
2339 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2340 | ||
2341 | /** | |
2342 | * regulator_set_current_limit - set regulator output current limit | |
2343 | * @regulator: regulator source | |
2344 | * @min_uA: Minimuum supported current in uA | |
2345 | * @max_uA: Maximum supported current in uA | |
2346 | * | |
2347 | * Sets current sink to the desired output current. This can be set during | |
2348 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2349 | * | |
2350 | * If the regulator is enabled then the current will change to the new value | |
2351 | * immediately otherwise if the regulator is disabled the regulator will | |
2352 | * output at the new current when enabled. | |
2353 | * | |
2354 | * NOTE: Regulator system constraints must be set for this regulator before | |
2355 | * calling this function otherwise this call will fail. | |
2356 | */ | |
2357 | int regulator_set_current_limit(struct regulator *regulator, | |
2358 | int min_uA, int max_uA) | |
2359 | { | |
2360 | struct regulator_dev *rdev = regulator->rdev; | |
2361 | int ret; | |
2362 | ||
2363 | mutex_lock(&rdev->mutex); | |
2364 | ||
2365 | /* sanity check */ | |
2366 | if (!rdev->desc->ops->set_current_limit) { | |
2367 | ret = -EINVAL; | |
2368 | goto out; | |
2369 | } | |
2370 | ||
2371 | /* constraints check */ | |
2372 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2373 | if (ret < 0) | |
2374 | goto out; | |
2375 | ||
2376 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2377 | out: | |
2378 | mutex_unlock(&rdev->mutex); | |
2379 | return ret; | |
2380 | } | |
2381 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2382 | ||
2383 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2384 | { | |
2385 | int ret; | |
2386 | ||
2387 | mutex_lock(&rdev->mutex); | |
2388 | ||
2389 | /* sanity check */ | |
2390 | if (!rdev->desc->ops->get_current_limit) { | |
2391 | ret = -EINVAL; | |
2392 | goto out; | |
2393 | } | |
2394 | ||
2395 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2396 | out: | |
2397 | mutex_unlock(&rdev->mutex); | |
2398 | return ret; | |
2399 | } | |
2400 | ||
2401 | /** | |
2402 | * regulator_get_current_limit - get regulator output current | |
2403 | * @regulator: regulator source | |
2404 | * | |
2405 | * This returns the current supplied by the specified current sink in uA. | |
2406 | * | |
2407 | * NOTE: If the regulator is disabled it will return the current value. This | |
2408 | * function should not be used to determine regulator state. | |
2409 | */ | |
2410 | int regulator_get_current_limit(struct regulator *regulator) | |
2411 | { | |
2412 | return _regulator_get_current_limit(regulator->rdev); | |
2413 | } | |
2414 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2415 | ||
2416 | /** | |
2417 | * regulator_set_mode - set regulator operating mode | |
2418 | * @regulator: regulator source | |
2419 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2420 | * | |
2421 | * Set regulator operating mode to increase regulator efficiency or improve | |
2422 | * regulation performance. | |
2423 | * | |
2424 | * NOTE: Regulator system constraints must be set for this regulator before | |
2425 | * calling this function otherwise this call will fail. | |
2426 | */ | |
2427 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2428 | { | |
2429 | struct regulator_dev *rdev = regulator->rdev; | |
2430 | int ret; | |
500b4ac9 | 2431 | int regulator_curr_mode; |
414c70cb LG |
2432 | |
2433 | mutex_lock(&rdev->mutex); | |
2434 | ||
2435 | /* sanity check */ | |
2436 | if (!rdev->desc->ops->set_mode) { | |
2437 | ret = -EINVAL; | |
2438 | goto out; | |
2439 | } | |
2440 | ||
500b4ac9 SI |
2441 | /* return if the same mode is requested */ |
2442 | if (rdev->desc->ops->get_mode) { | |
2443 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2444 | if (regulator_curr_mode == mode) { | |
2445 | ret = 0; | |
2446 | goto out; | |
2447 | } | |
2448 | } | |
2449 | ||
414c70cb | 2450 | /* constraints check */ |
22c51b47 | 2451 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2452 | if (ret < 0) |
2453 | goto out; | |
2454 | ||
2455 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2456 | out: | |
2457 | mutex_unlock(&rdev->mutex); | |
2458 | return ret; | |
2459 | } | |
2460 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2461 | ||
2462 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2463 | { | |
2464 | int ret; | |
2465 | ||
2466 | mutex_lock(&rdev->mutex); | |
2467 | ||
2468 | /* sanity check */ | |
2469 | if (!rdev->desc->ops->get_mode) { | |
2470 | ret = -EINVAL; | |
2471 | goto out; | |
2472 | } | |
2473 | ||
2474 | ret = rdev->desc->ops->get_mode(rdev); | |
2475 | out: | |
2476 | mutex_unlock(&rdev->mutex); | |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | /** | |
2481 | * regulator_get_mode - get regulator operating mode | |
2482 | * @regulator: regulator source | |
2483 | * | |
2484 | * Get the current regulator operating mode. | |
2485 | */ | |
2486 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2487 | { | |
2488 | return _regulator_get_mode(regulator->rdev); | |
2489 | } | |
2490 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2491 | ||
2492 | /** | |
2493 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2494 | * @regulator: regulator source | |
2495 | * @uA_load: load current | |
2496 | * | |
2497 | * Notifies the regulator core of a new device load. This is then used by | |
2498 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2499 | * operating mode for the new regulator loading. | |
2500 | * | |
2501 | * Consumer devices notify their supply regulator of the maximum power | |
2502 | * they will require (can be taken from device datasheet in the power | |
2503 | * consumption tables) when they change operational status and hence power | |
2504 | * state. Examples of operational state changes that can affect power | |
2505 | * consumption are :- | |
2506 | * | |
2507 | * o Device is opened / closed. | |
2508 | * o Device I/O is about to begin or has just finished. | |
2509 | * o Device is idling in between work. | |
2510 | * | |
2511 | * This information is also exported via sysfs to userspace. | |
2512 | * | |
2513 | * DRMS will sum the total requested load on the regulator and change | |
2514 | * to the most efficient operating mode if platform constraints allow. | |
2515 | * | |
2516 | * Returns the new regulator mode or error. | |
2517 | */ | |
2518 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2519 | { | |
2520 | struct regulator_dev *rdev = regulator->rdev; | |
2521 | struct regulator *consumer; | |
2522 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2523 | unsigned int mode; | |
2524 | ||
2525 | mutex_lock(&rdev->mutex); | |
2526 | ||
a4b41483 MB |
2527 | /* |
2528 | * first check to see if we can set modes at all, otherwise just | |
2529 | * tell the consumer everything is OK. | |
2530 | */ | |
414c70cb LG |
2531 | regulator->uA_load = uA_load; |
2532 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2533 | if (ret < 0) { |
2534 | ret = 0; | |
414c70cb | 2535 | goto out; |
a4b41483 | 2536 | } |
414c70cb | 2537 | |
414c70cb LG |
2538 | if (!rdev->desc->ops->get_optimum_mode) |
2539 | goto out; | |
2540 | ||
a4b41483 MB |
2541 | /* |
2542 | * we can actually do this so any errors are indicators of | |
2543 | * potential real failure. | |
2544 | */ | |
2545 | ret = -EINVAL; | |
2546 | ||
854ccbae AL |
2547 | if (!rdev->desc->ops->set_mode) |
2548 | goto out; | |
2549 | ||
414c70cb | 2550 | /* get output voltage */ |
1bf5a1f8 | 2551 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2552 | if (output_uV <= 0) { |
5da84fd9 | 2553 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2554 | goto out; |
2555 | } | |
2556 | ||
2557 | /* get input voltage */ | |
1bf5a1f8 MB |
2558 | input_uV = 0; |
2559 | if (rdev->supply) | |
3801b86a | 2560 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 2561 | if (input_uV <= 0) |
414c70cb LG |
2562 | input_uV = rdev->constraints->input_uV; |
2563 | if (input_uV <= 0) { | |
5da84fd9 | 2564 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2565 | goto out; |
2566 | } | |
2567 | ||
2568 | /* calc total requested load for this regulator */ | |
2569 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2570 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2571 | |
2572 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2573 | input_uV, output_uV, | |
2574 | total_uA_load); | |
2c608234 | 2575 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2576 | if (ret < 0) { |
5da84fd9 JP |
2577 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2578 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2579 | goto out; |
2580 | } | |
2581 | ||
2582 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2583 | if (ret < 0) { |
5da84fd9 | 2584 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2585 | goto out; |
2586 | } | |
2587 | ret = mode; | |
2588 | out: | |
2589 | mutex_unlock(&rdev->mutex); | |
2590 | return ret; | |
2591 | } | |
2592 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2593 | ||
2594 | /** | |
2595 | * regulator_register_notifier - register regulator event notifier | |
2596 | * @regulator: regulator source | |
69279fb9 | 2597 | * @nb: notifier block |
414c70cb LG |
2598 | * |
2599 | * Register notifier block to receive regulator events. | |
2600 | */ | |
2601 | int regulator_register_notifier(struct regulator *regulator, | |
2602 | struct notifier_block *nb) | |
2603 | { | |
2604 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2605 | nb); | |
2606 | } | |
2607 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2608 | ||
2609 | /** | |
2610 | * regulator_unregister_notifier - unregister regulator event notifier | |
2611 | * @regulator: regulator source | |
69279fb9 | 2612 | * @nb: notifier block |
414c70cb LG |
2613 | * |
2614 | * Unregister regulator event notifier block. | |
2615 | */ | |
2616 | int regulator_unregister_notifier(struct regulator *regulator, | |
2617 | struct notifier_block *nb) | |
2618 | { | |
2619 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2620 | nb); | |
2621 | } | |
2622 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2623 | ||
b136fb44 JC |
2624 | /* notify regulator consumers and downstream regulator consumers. |
2625 | * Note mutex must be held by caller. | |
2626 | */ | |
414c70cb LG |
2627 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2628 | unsigned long event, void *data) | |
2629 | { | |
414c70cb | 2630 | /* call rdev chain first */ |
414c70cb | 2631 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2632 | } |
2633 | ||
2634 | /** | |
2635 | * regulator_bulk_get - get multiple regulator consumers | |
2636 | * | |
2637 | * @dev: Device to supply | |
2638 | * @num_consumers: Number of consumers to register | |
2639 | * @consumers: Configuration of consumers; clients are stored here. | |
2640 | * | |
2641 | * @return 0 on success, an errno on failure. | |
2642 | * | |
2643 | * This helper function allows drivers to get several regulator | |
2644 | * consumers in one operation. If any of the regulators cannot be | |
2645 | * acquired then any regulators that were allocated will be freed | |
2646 | * before returning to the caller. | |
2647 | */ | |
2648 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2649 | struct regulator_bulk_data *consumers) | |
2650 | { | |
2651 | int i; | |
2652 | int ret; | |
2653 | ||
2654 | for (i = 0; i < num_consumers; i++) | |
2655 | consumers[i].consumer = NULL; | |
2656 | ||
2657 | for (i = 0; i < num_consumers; i++) { | |
2658 | consumers[i].consumer = regulator_get(dev, | |
2659 | consumers[i].supply); | |
2660 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2661 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2662 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2663 | consumers[i].supply, ret); | |
414c70cb LG |
2664 | consumers[i].consumer = NULL; |
2665 | goto err; | |
2666 | } | |
2667 | } | |
2668 | ||
2669 | return 0; | |
2670 | ||
2671 | err: | |
b29c7690 | 2672 | while (--i >= 0) |
414c70cb LG |
2673 | regulator_put(consumers[i].consumer); |
2674 | ||
2675 | return ret; | |
2676 | } | |
2677 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2678 | ||
e6e74030 MB |
2679 | /** |
2680 | * devm_regulator_bulk_get - managed get multiple regulator consumers | |
2681 | * | |
2682 | * @dev: Device to supply | |
2683 | * @num_consumers: Number of consumers to register | |
2684 | * @consumers: Configuration of consumers; clients are stored here. | |
2685 | * | |
2686 | * @return 0 on success, an errno on failure. | |
2687 | * | |
2688 | * This helper function allows drivers to get several regulator | |
2689 | * consumers in one operation with management, the regulators will | |
2690 | * automatically be freed when the device is unbound. If any of the | |
2691 | * regulators cannot be acquired then any regulators that were | |
2692 | * allocated will be freed before returning to the caller. | |
2693 | */ | |
2694 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, | |
2695 | struct regulator_bulk_data *consumers) | |
2696 | { | |
2697 | int i; | |
2698 | int ret; | |
2699 | ||
2700 | for (i = 0; i < num_consumers; i++) | |
2701 | consumers[i].consumer = NULL; | |
2702 | ||
2703 | for (i = 0; i < num_consumers; i++) { | |
2704 | consumers[i].consumer = devm_regulator_get(dev, | |
2705 | consumers[i].supply); | |
2706 | if (IS_ERR(consumers[i].consumer)) { | |
2707 | ret = PTR_ERR(consumers[i].consumer); | |
2708 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
2709 | consumers[i].supply, ret); | |
2710 | consumers[i].consumer = NULL; | |
2711 | goto err; | |
2712 | } | |
2713 | } | |
2714 | ||
2715 | return 0; | |
2716 | ||
2717 | err: | |
2718 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2719 | devm_regulator_put(consumers[i].consumer); | |
2720 | ||
2721 | return ret; | |
2722 | } | |
2723 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); | |
2724 | ||
f21e0e81 MB |
2725 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2726 | { | |
2727 | struct regulator_bulk_data *bulk = data; | |
2728 | ||
2729 | bulk->ret = regulator_enable(bulk->consumer); | |
2730 | } | |
2731 | ||
414c70cb LG |
2732 | /** |
2733 | * regulator_bulk_enable - enable multiple regulator consumers | |
2734 | * | |
2735 | * @num_consumers: Number of consumers | |
2736 | * @consumers: Consumer data; clients are stored here. | |
2737 | * @return 0 on success, an errno on failure | |
2738 | * | |
2739 | * This convenience API allows consumers to enable multiple regulator | |
2740 | * clients in a single API call. If any consumers cannot be enabled | |
2741 | * then any others that were enabled will be disabled again prior to | |
2742 | * return. | |
2743 | */ | |
2744 | int regulator_bulk_enable(int num_consumers, | |
2745 | struct regulator_bulk_data *consumers) | |
2746 | { | |
f21e0e81 | 2747 | LIST_HEAD(async_domain); |
414c70cb | 2748 | int i; |
f21e0e81 | 2749 | int ret = 0; |
414c70cb | 2750 | |
6492bc1b MB |
2751 | for (i = 0; i < num_consumers; i++) { |
2752 | if (consumers[i].consumer->always_on) | |
2753 | consumers[i].ret = 0; | |
2754 | else | |
2755 | async_schedule_domain(regulator_bulk_enable_async, | |
2756 | &consumers[i], &async_domain); | |
2757 | } | |
f21e0e81 MB |
2758 | |
2759 | async_synchronize_full_domain(&async_domain); | |
2760 | ||
2761 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2762 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2763 | if (consumers[i].ret != 0) { |
2764 | ret = consumers[i].ret; | |
414c70cb | 2765 | goto err; |
f21e0e81 | 2766 | } |
414c70cb LG |
2767 | } |
2768 | ||
2769 | return 0; | |
2770 | ||
2771 | err: | |
b29c7690 AL |
2772 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); |
2773 | while (--i >= 0) | |
2774 | regulator_disable(consumers[i].consumer); | |
414c70cb LG |
2775 | |
2776 | return ret; | |
2777 | } | |
2778 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2779 | ||
2780 | /** | |
2781 | * regulator_bulk_disable - disable multiple regulator consumers | |
2782 | * | |
2783 | * @num_consumers: Number of consumers | |
2784 | * @consumers: Consumer data; clients are stored here. | |
2785 | * @return 0 on success, an errno on failure | |
2786 | * | |
2787 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
2788 | * clients in a single API call. If any consumers cannot be disabled |
2789 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
2790 | * return. |
2791 | */ | |
2792 | int regulator_bulk_disable(int num_consumers, | |
2793 | struct regulator_bulk_data *consumers) | |
2794 | { | |
2795 | int i; | |
01e86f49 | 2796 | int ret, r; |
414c70cb | 2797 | |
49e22632 | 2798 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
2799 | ret = regulator_disable(consumers[i].consumer); |
2800 | if (ret != 0) | |
2801 | goto err; | |
2802 | } | |
2803 | ||
2804 | return 0; | |
2805 | ||
2806 | err: | |
5da84fd9 | 2807 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
2808 | for (++i; i < num_consumers; ++i) { |
2809 | r = regulator_enable(consumers[i].consumer); | |
2810 | if (r != 0) | |
2811 | pr_err("Failed to reename %s: %d\n", | |
2812 | consumers[i].supply, r); | |
2813 | } | |
414c70cb LG |
2814 | |
2815 | return ret; | |
2816 | } | |
2817 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2818 | ||
e1de2f42 DK |
2819 | /** |
2820 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
2821 | * | |
2822 | * @num_consumers: Number of consumers | |
2823 | * @consumers: Consumer data; clients are stored here. | |
2824 | * @return 0 on success, an errno on failure | |
2825 | * | |
2826 | * This convenience API allows consumers to forcibly disable multiple regulator | |
2827 | * clients in a single API call. | |
2828 | * NOTE: This should be used for situations when device damage will | |
2829 | * likely occur if the regulators are not disabled (e.g. over temp). | |
2830 | * Although regulator_force_disable function call for some consumers can | |
2831 | * return error numbers, the function is called for all consumers. | |
2832 | */ | |
2833 | int regulator_bulk_force_disable(int num_consumers, | |
2834 | struct regulator_bulk_data *consumers) | |
2835 | { | |
2836 | int i; | |
2837 | int ret; | |
2838 | ||
2839 | for (i = 0; i < num_consumers; i++) | |
2840 | consumers[i].ret = | |
2841 | regulator_force_disable(consumers[i].consumer); | |
2842 | ||
2843 | for (i = 0; i < num_consumers; i++) { | |
2844 | if (consumers[i].ret != 0) { | |
2845 | ret = consumers[i].ret; | |
2846 | goto out; | |
2847 | } | |
2848 | } | |
2849 | ||
2850 | return 0; | |
2851 | out: | |
2852 | return ret; | |
2853 | } | |
2854 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
2855 | ||
414c70cb LG |
2856 | /** |
2857 | * regulator_bulk_free - free multiple regulator consumers | |
2858 | * | |
2859 | * @num_consumers: Number of consumers | |
2860 | * @consumers: Consumer data; clients are stored here. | |
2861 | * | |
2862 | * This convenience API allows consumers to free multiple regulator | |
2863 | * clients in a single API call. | |
2864 | */ | |
2865 | void regulator_bulk_free(int num_consumers, | |
2866 | struct regulator_bulk_data *consumers) | |
2867 | { | |
2868 | int i; | |
2869 | ||
2870 | for (i = 0; i < num_consumers; i++) { | |
2871 | regulator_put(consumers[i].consumer); | |
2872 | consumers[i].consumer = NULL; | |
2873 | } | |
2874 | } | |
2875 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2876 | ||
2877 | /** | |
2878 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2879 | * @rdev: regulator source |
414c70cb | 2880 | * @event: notifier block |
69279fb9 | 2881 | * @data: callback-specific data. |
414c70cb LG |
2882 | * |
2883 | * Called by regulator drivers to notify clients a regulator event has | |
2884 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2885 | * Note lock must be held by caller. |
414c70cb LG |
2886 | */ |
2887 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2888 | unsigned long event, void *data) | |
2889 | { | |
2890 | _notifier_call_chain(rdev, event, data); | |
2891 | return NOTIFY_DONE; | |
2892 | ||
2893 | } | |
2894 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2895 | ||
be721979 MB |
2896 | /** |
2897 | * regulator_mode_to_status - convert a regulator mode into a status | |
2898 | * | |
2899 | * @mode: Mode to convert | |
2900 | * | |
2901 | * Convert a regulator mode into a status. | |
2902 | */ | |
2903 | int regulator_mode_to_status(unsigned int mode) | |
2904 | { | |
2905 | switch (mode) { | |
2906 | case REGULATOR_MODE_FAST: | |
2907 | return REGULATOR_STATUS_FAST; | |
2908 | case REGULATOR_MODE_NORMAL: | |
2909 | return REGULATOR_STATUS_NORMAL; | |
2910 | case REGULATOR_MODE_IDLE: | |
2911 | return REGULATOR_STATUS_IDLE; | |
2912 | case REGULATOR_STATUS_STANDBY: | |
2913 | return REGULATOR_STATUS_STANDBY; | |
2914 | default: | |
2915 | return 0; | |
2916 | } | |
2917 | } | |
2918 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2919 | ||
7ad68e2f DB |
2920 | /* |
2921 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2922 | * create attributes that can be meaningfully displayed. | |
2923 | */ | |
2924 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2925 | { | |
2926 | struct device *dev = &rdev->dev; | |
2927 | struct regulator_ops *ops = rdev->desc->ops; | |
2928 | int status = 0; | |
2929 | ||
2930 | /* some attributes need specific methods to be displayed */ | |
4c78899b MB |
2931 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
2932 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { | |
7ad68e2f DB |
2933 | status = device_create_file(dev, &dev_attr_microvolts); |
2934 | if (status < 0) | |
2935 | return status; | |
2936 | } | |
2937 | if (ops->get_current_limit) { | |
2938 | status = device_create_file(dev, &dev_attr_microamps); | |
2939 | if (status < 0) | |
2940 | return status; | |
2941 | } | |
2942 | if (ops->get_mode) { | |
2943 | status = device_create_file(dev, &dev_attr_opmode); | |
2944 | if (status < 0) | |
2945 | return status; | |
2946 | } | |
2947 | if (ops->is_enabled) { | |
2948 | status = device_create_file(dev, &dev_attr_state); | |
2949 | if (status < 0) | |
2950 | return status; | |
2951 | } | |
853116a1 DB |
2952 | if (ops->get_status) { |
2953 | status = device_create_file(dev, &dev_attr_status); | |
2954 | if (status < 0) | |
2955 | return status; | |
2956 | } | |
7ad68e2f DB |
2957 | |
2958 | /* some attributes are type-specific */ | |
2959 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2960 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2961 | if (status < 0) | |
2962 | return status; | |
2963 | } | |
2964 | ||
2965 | /* all the other attributes exist to support constraints; | |
2966 | * don't show them if there are no constraints, or if the | |
2967 | * relevant supporting methods are missing. | |
2968 | */ | |
2969 | if (!rdev->constraints) | |
2970 | return status; | |
2971 | ||
2972 | /* constraints need specific supporting methods */ | |
e8eef82b | 2973 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2974 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2975 | if (status < 0) | |
2976 | return status; | |
2977 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2978 | if (status < 0) | |
2979 | return status; | |
2980 | } | |
2981 | if (ops->set_current_limit) { | |
2982 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2983 | if (status < 0) | |
2984 | return status; | |
2985 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2986 | if (status < 0) | |
2987 | return status; | |
2988 | } | |
2989 | ||
7ad68e2f DB |
2990 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
2991 | if (status < 0) | |
2992 | return status; | |
2993 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2994 | if (status < 0) | |
2995 | return status; | |
2996 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2997 | if (status < 0) | |
2998 | return status; | |
2999 | ||
3000 | if (ops->set_suspend_voltage) { | |
3001 | status = device_create_file(dev, | |
3002 | &dev_attr_suspend_standby_microvolts); | |
3003 | if (status < 0) | |
3004 | return status; | |
3005 | status = device_create_file(dev, | |
3006 | &dev_attr_suspend_mem_microvolts); | |
3007 | if (status < 0) | |
3008 | return status; | |
3009 | status = device_create_file(dev, | |
3010 | &dev_attr_suspend_disk_microvolts); | |
3011 | if (status < 0) | |
3012 | return status; | |
3013 | } | |
3014 | ||
3015 | if (ops->set_suspend_mode) { | |
3016 | status = device_create_file(dev, | |
3017 | &dev_attr_suspend_standby_mode); | |
3018 | if (status < 0) | |
3019 | return status; | |
3020 | status = device_create_file(dev, | |
3021 | &dev_attr_suspend_mem_mode); | |
3022 | if (status < 0) | |
3023 | return status; | |
3024 | status = device_create_file(dev, | |
3025 | &dev_attr_suspend_disk_mode); | |
3026 | if (status < 0) | |
3027 | return status; | |
3028 | } | |
3029 | ||
3030 | return status; | |
3031 | } | |
3032 | ||
1130e5b3 MB |
3033 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3034 | { | |
1130e5b3 | 3035 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3036 | if (!rdev->debugfs) { |
1130e5b3 | 3037 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3038 | return; |
3039 | } | |
3040 | ||
3041 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3042 | &rdev->use_count); | |
3043 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3044 | &rdev->open_count); | |
1130e5b3 MB |
3045 | } |
3046 | ||
414c70cb LG |
3047 | /** |
3048 | * regulator_register - register regulator | |
69279fb9 | 3049 | * @regulator_desc: regulator to register |
c172708d | 3050 | * @config: runtime configuration for regulator |
414c70cb LG |
3051 | * |
3052 | * Called by regulator drivers to register a regulator. | |
3053 | * Returns 0 on success. | |
3054 | */ | |
65f26846 MB |
3055 | struct regulator_dev * |
3056 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3057 | const struct regulator_config *config) |
414c70cb | 3058 | { |
9a8f5e07 | 3059 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3060 | const struct regulator_init_data *init_data; |
414c70cb LG |
3061 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3062 | struct regulator_dev *rdev; | |
32c8fad4 | 3063 | struct device *dev; |
a5766f11 | 3064 | int ret, i; |
69511a45 | 3065 | const char *supply = NULL; |
414c70cb | 3066 | |
c172708d | 3067 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3068 | return ERR_PTR(-EINVAL); |
3069 | ||
32c8fad4 | 3070 | dev = config->dev; |
dcf70112 | 3071 | WARN_ON(!dev); |
32c8fad4 | 3072 | |
414c70cb LG |
3073 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3074 | return ERR_PTR(-EINVAL); | |
3075 | ||
cd78dfc6 DL |
3076 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3077 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3078 | return ERR_PTR(-EINVAL); |
3079 | ||
476c2d83 MB |
3080 | /* Only one of each should be implemented */ |
3081 | WARN_ON(regulator_desc->ops->get_voltage && | |
3082 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3083 | WARN_ON(regulator_desc->ops->set_voltage && |
3084 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3085 | |
3086 | /* If we're using selectors we must implement list_voltage. */ | |
3087 | if (regulator_desc->ops->get_voltage_sel && | |
3088 | !regulator_desc->ops->list_voltage) { | |
3089 | return ERR_PTR(-EINVAL); | |
3090 | } | |
e8eef82b MB |
3091 | if (regulator_desc->ops->set_voltage_sel && |
3092 | !regulator_desc->ops->list_voltage) { | |
3093 | return ERR_PTR(-EINVAL); | |
3094 | } | |
476c2d83 | 3095 | |
c172708d MB |
3096 | init_data = config->init_data; |
3097 | ||
414c70cb LG |
3098 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3099 | if (rdev == NULL) | |
3100 | return ERR_PTR(-ENOMEM); | |
3101 | ||
3102 | mutex_lock(®ulator_list_mutex); | |
3103 | ||
3104 | mutex_init(&rdev->mutex); | |
c172708d | 3105 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3106 | rdev->owner = regulator_desc->owner; |
3107 | rdev->desc = regulator_desc; | |
65b19ce6 | 3108 | rdev->regmap = config->regmap; |
414c70cb | 3109 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3110 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3111 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3112 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3113 | |
a5766f11 | 3114 | /* preform any regulator specific init */ |
9a8f5e07 | 3115 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3116 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3117 | if (ret < 0) |
3118 | goto clean; | |
a5766f11 LG |
3119 | } |
3120 | ||
a5766f11 | 3121 | /* register with sysfs */ |
414c70cb | 3122 | rdev->dev.class = ®ulator_class; |
c172708d | 3123 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3124 | rdev->dev.parent = dev; |
812460a9 KS |
3125 | dev_set_name(&rdev->dev, "regulator.%d", |
3126 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3127 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3128 | if (ret != 0) { |
3129 | put_device(&rdev->dev); | |
4fca9545 | 3130 | goto clean; |
ad7725cb | 3131 | } |
a5766f11 LG |
3132 | |
3133 | dev_set_drvdata(&rdev->dev, rdev); | |
3134 | ||
74f544c1 | 3135 | /* set regulator constraints */ |
9a8f5e07 MB |
3136 | if (init_data) |
3137 | constraints = &init_data->constraints; | |
3138 | ||
3139 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3140 | if (ret < 0) |
3141 | goto scrub; | |
3142 | ||
7ad68e2f DB |
3143 | /* add attributes supported by this regulator */ |
3144 | ret = add_regulator_attributes(rdev); | |
3145 | if (ret < 0) | |
3146 | goto scrub; | |
3147 | ||
9a8f5e07 | 3148 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3149 | supply = init_data->supply_regulator; |
3150 | else if (regulator_desc->supply_name) | |
3151 | supply = regulator_desc->supply_name; | |
3152 | ||
3153 | if (supply) { | |
0178f3e2 | 3154 | struct regulator_dev *r; |
0178f3e2 | 3155 | |
6d191a5f | 3156 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3157 | |
69511a45 RN |
3158 | if (!r) { |
3159 | dev_err(dev, "Failed to find supply %s\n", supply); | |
04bf3011 | 3160 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3161 | goto scrub; |
3162 | } | |
3163 | ||
3164 | ret = set_supply(rdev, r); | |
3165 | if (ret < 0) | |
3166 | goto scrub; | |
b2296bd4 LD |
3167 | |
3168 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3169 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3170 | ret = regulator_enable(rdev->supply); |
3171 | if (ret < 0) | |
3172 | goto scrub; | |
3173 | } | |
0178f3e2 MB |
3174 | } |
3175 | ||
a5766f11 | 3176 | /* add consumers devices */ |
9a8f5e07 MB |
3177 | if (init_data) { |
3178 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3179 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3180 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3181 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3182 | if (ret < 0) { |
3183 | dev_err(dev, "Failed to set supply %s\n", | |
3184 | init_data->consumer_supplies[i].supply); | |
3185 | goto unset_supplies; | |
3186 | } | |
23c2f041 | 3187 | } |
414c70cb | 3188 | } |
a5766f11 LG |
3189 | |
3190 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3191 | |
3192 | rdev_init_debugfs(rdev); | |
a5766f11 | 3193 | out: |
414c70cb LG |
3194 | mutex_unlock(®ulator_list_mutex); |
3195 | return rdev; | |
4fca9545 | 3196 | |
d4033b54 JN |
3197 | unset_supplies: |
3198 | unset_regulator_supplies(rdev); | |
3199 | ||
4fca9545 | 3200 | scrub: |
e81dba85 MB |
3201 | if (rdev->supply) |
3202 | regulator_put(rdev->supply); | |
1a6958e7 | 3203 | kfree(rdev->constraints); |
4fca9545 | 3204 | device_unregister(&rdev->dev); |
53032daf PW |
3205 | /* device core frees rdev */ |
3206 | rdev = ERR_PTR(ret); | |
3207 | goto out; | |
3208 | ||
4fca9545 DB |
3209 | clean: |
3210 | kfree(rdev); | |
3211 | rdev = ERR_PTR(ret); | |
3212 | goto out; | |
414c70cb LG |
3213 | } |
3214 | EXPORT_SYMBOL_GPL(regulator_register); | |
3215 | ||
3216 | /** | |
3217 | * regulator_unregister - unregister regulator | |
69279fb9 | 3218 | * @rdev: regulator to unregister |
414c70cb LG |
3219 | * |
3220 | * Called by regulator drivers to unregister a regulator. | |
3221 | */ | |
3222 | void regulator_unregister(struct regulator_dev *rdev) | |
3223 | { | |
3224 | if (rdev == NULL) | |
3225 | return; | |
3226 | ||
e032b376 MB |
3227 | if (rdev->supply) |
3228 | regulator_put(rdev->supply); | |
414c70cb | 3229 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3230 | debugfs_remove_recursive(rdev->debugfs); |
da07ecd9 | 3231 | flush_work_sync(&rdev->disable_work.work); |
6bf87d17 | 3232 | WARN_ON(rdev->open_count); |
0f1d747b | 3233 | unset_regulator_supplies(rdev); |
414c70cb | 3234 | list_del(&rdev->list); |
f8c12fe3 | 3235 | kfree(rdev->constraints); |
58fb5cf5 | 3236 | device_unregister(&rdev->dev); |
414c70cb LG |
3237 | mutex_unlock(®ulator_list_mutex); |
3238 | } | |
3239 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3240 | ||
414c70cb | 3241 | /** |
cf7bbcdf | 3242 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3243 | * @state: system suspend state |
3244 | * | |
3245 | * Configure each regulator with it's suspend operating parameters for state. | |
3246 | * This will usually be called by machine suspend code prior to supending. | |
3247 | */ | |
3248 | int regulator_suspend_prepare(suspend_state_t state) | |
3249 | { | |
3250 | struct regulator_dev *rdev; | |
3251 | int ret = 0; | |
3252 | ||
3253 | /* ON is handled by regulator active state */ | |
3254 | if (state == PM_SUSPEND_ON) | |
3255 | return -EINVAL; | |
3256 | ||
3257 | mutex_lock(®ulator_list_mutex); | |
3258 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3259 | ||
3260 | mutex_lock(&rdev->mutex); | |
3261 | ret = suspend_prepare(rdev, state); | |
3262 | mutex_unlock(&rdev->mutex); | |
3263 | ||
3264 | if (ret < 0) { | |
5da84fd9 | 3265 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3266 | goto out; |
3267 | } | |
3268 | } | |
3269 | out: | |
3270 | mutex_unlock(®ulator_list_mutex); | |
3271 | return ret; | |
3272 | } | |
3273 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3274 | ||
7a32b589 MH |
3275 | /** |
3276 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3277 | * | |
3278 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3279 | * and that should be turned on according to the regulators properties. | |
3280 | */ | |
3281 | int regulator_suspend_finish(void) | |
3282 | { | |
3283 | struct regulator_dev *rdev; | |
3284 | int ret = 0, error; | |
3285 | ||
3286 | mutex_lock(®ulator_list_mutex); | |
3287 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3288 | struct regulator_ops *ops = rdev->desc->ops; | |
3289 | ||
3290 | mutex_lock(&rdev->mutex); | |
3291 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3292 | ops->enable) { | |
3293 | error = ops->enable(rdev); | |
3294 | if (error) | |
3295 | ret = error; | |
3296 | } else { | |
3297 | if (!has_full_constraints) | |
3298 | goto unlock; | |
3299 | if (!ops->disable) | |
3300 | goto unlock; | |
b1a86831 | 3301 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3302 | goto unlock; |
3303 | ||
3304 | error = ops->disable(rdev); | |
3305 | if (error) | |
3306 | ret = error; | |
3307 | } | |
3308 | unlock: | |
3309 | mutex_unlock(&rdev->mutex); | |
3310 | } | |
3311 | mutex_unlock(®ulator_list_mutex); | |
3312 | return ret; | |
3313 | } | |
3314 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3315 | ||
ca725561 MB |
3316 | /** |
3317 | * regulator_has_full_constraints - the system has fully specified constraints | |
3318 | * | |
3319 | * Calling this function will cause the regulator API to disable all | |
3320 | * regulators which have a zero use count and don't have an always_on | |
3321 | * constraint in a late_initcall. | |
3322 | * | |
3323 | * The intention is that this will become the default behaviour in a | |
3324 | * future kernel release so users are encouraged to use this facility | |
3325 | * now. | |
3326 | */ | |
3327 | void regulator_has_full_constraints(void) | |
3328 | { | |
3329 | has_full_constraints = 1; | |
3330 | } | |
3331 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3332 | ||
688fe99a MB |
3333 | /** |
3334 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
3335 | * | |
3336 | * Calling this function will cause the regulator API to provide a | |
3337 | * dummy regulator to consumers if no physical regulator is found, | |
3338 | * allowing most consumers to proceed as though a regulator were | |
3339 | * configured. This allows systems such as those with software | |
3340 | * controllable regulators for the CPU core only to be brought up more | |
3341 | * readily. | |
3342 | */ | |
3343 | void regulator_use_dummy_regulator(void) | |
3344 | { | |
3345 | board_wants_dummy_regulator = true; | |
3346 | } | |
3347 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
3348 | ||
414c70cb LG |
3349 | /** |
3350 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3351 | * @rdev: regulator |
414c70cb LG |
3352 | * |
3353 | * Get rdev regulator driver private data. This call can be used in the | |
3354 | * regulator driver context. | |
3355 | */ | |
3356 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3357 | { | |
3358 | return rdev->reg_data; | |
3359 | } | |
3360 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3361 | ||
3362 | /** | |
3363 | * regulator_get_drvdata - get regulator driver data | |
3364 | * @regulator: regulator | |
3365 | * | |
3366 | * Get regulator driver private data. This call can be used in the consumer | |
3367 | * driver context when non API regulator specific functions need to be called. | |
3368 | */ | |
3369 | void *regulator_get_drvdata(struct regulator *regulator) | |
3370 | { | |
3371 | return regulator->rdev->reg_data; | |
3372 | } | |
3373 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3374 | ||
3375 | /** | |
3376 | * regulator_set_drvdata - set regulator driver data | |
3377 | * @regulator: regulator | |
3378 | * @data: data | |
3379 | */ | |
3380 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3381 | { | |
3382 | regulator->rdev->reg_data = data; | |
3383 | } | |
3384 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3385 | ||
3386 | /** | |
3387 | * regulator_get_id - get regulator ID | |
69279fb9 | 3388 | * @rdev: regulator |
414c70cb LG |
3389 | */ |
3390 | int rdev_get_id(struct regulator_dev *rdev) | |
3391 | { | |
3392 | return rdev->desc->id; | |
3393 | } | |
3394 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3395 | ||
a5766f11 LG |
3396 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3397 | { | |
3398 | return &rdev->dev; | |
3399 | } | |
3400 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3401 | ||
3402 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3403 | { | |
3404 | return reg_init_data->driver_data; | |
3405 | } | |
3406 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3407 | ||
ba55a974 MB |
3408 | #ifdef CONFIG_DEBUG_FS |
3409 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3410 | size_t count, loff_t *ppos) | |
3411 | { | |
3412 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3413 | ssize_t len, ret = 0; | |
3414 | struct regulator_map *map; | |
3415 | ||
3416 | if (!buf) | |
3417 | return -ENOMEM; | |
3418 | ||
3419 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3420 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3421 | "%s -> %s.%s\n", | |
3422 | rdev_get_name(map->regulator), map->dev_name, | |
3423 | map->supply); | |
3424 | if (len >= 0) | |
3425 | ret += len; | |
3426 | if (ret > PAGE_SIZE) { | |
3427 | ret = PAGE_SIZE; | |
3428 | break; | |
3429 | } | |
3430 | } | |
3431 | ||
3432 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3433 | ||
3434 | kfree(buf); | |
3435 | ||
3436 | return ret; | |
3437 | } | |
24751434 | 3438 | #endif |
ba55a974 MB |
3439 | |
3440 | static const struct file_operations supply_map_fops = { | |
24751434 | 3441 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3442 | .read = supply_map_read_file, |
3443 | .llseek = default_llseek, | |
ba55a974 | 3444 | #endif |
24751434 | 3445 | }; |
ba55a974 | 3446 | |
414c70cb LG |
3447 | static int __init regulator_init(void) |
3448 | { | |
34abbd68 MB |
3449 | int ret; |
3450 | ||
34abbd68 MB |
3451 | ret = class_register(®ulator_class); |
3452 | ||
1130e5b3 | 3453 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3454 | if (!debugfs_root) |
1130e5b3 | 3455 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3456 | |
f4d562c6 MB |
3457 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3458 | &supply_map_fops); | |
1130e5b3 | 3459 | |
34abbd68 MB |
3460 | regulator_dummy_init(); |
3461 | ||
3462 | return ret; | |
414c70cb LG |
3463 | } |
3464 | ||
3465 | /* init early to allow our consumers to complete system booting */ | |
3466 | core_initcall(regulator_init); | |
ca725561 MB |
3467 | |
3468 | static int __init regulator_init_complete(void) | |
3469 | { | |
3470 | struct regulator_dev *rdev; | |
3471 | struct regulator_ops *ops; | |
3472 | struct regulation_constraints *c; | |
3473 | int enabled, ret; | |
ca725561 MB |
3474 | |
3475 | mutex_lock(®ulator_list_mutex); | |
3476 | ||
3477 | /* If we have a full configuration then disable any regulators | |
3478 | * which are not in use or always_on. This will become the | |
3479 | * default behaviour in the future. | |
3480 | */ | |
3481 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3482 | ops = rdev->desc->ops; | |
3483 | c = rdev->constraints; | |
3484 | ||
f25e0b4f | 3485 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3486 | continue; |
3487 | ||
3488 | mutex_lock(&rdev->mutex); | |
3489 | ||
3490 | if (rdev->use_count) | |
3491 | goto unlock; | |
3492 | ||
3493 | /* If we can't read the status assume it's on. */ | |
3494 | if (ops->is_enabled) | |
3495 | enabled = ops->is_enabled(rdev); | |
3496 | else | |
3497 | enabled = 1; | |
3498 | ||
3499 | if (!enabled) | |
3500 | goto unlock; | |
3501 | ||
3502 | if (has_full_constraints) { | |
3503 | /* We log since this may kill the system if it | |
3504 | * goes wrong. */ | |
5da84fd9 | 3505 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3506 | ret = ops->disable(rdev); |
3507 | if (ret != 0) { | |
5da84fd9 | 3508 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3509 | } |
3510 | } else { | |
3511 | /* The intention is that in future we will | |
3512 | * assume that full constraints are provided | |
3513 | * so warn even if we aren't going to do | |
3514 | * anything here. | |
3515 | */ | |
5da84fd9 | 3516 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3517 | } |
3518 | ||
3519 | unlock: | |
3520 | mutex_unlock(&rdev->mutex); | |
3521 | } | |
3522 | ||
3523 | mutex_unlock(®ulator_list_mutex); | |
3524 | ||
3525 | return 0; | |
3526 | } | |
3527 | late_initcall(regulator_init_complete); |