]>
Commit | Line | Data |
---|---|---|
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 | ||
1d7372e1 | 16 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
c5e28ed7 | 17 | |
414c70cb LG |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/device.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
414c70cb LG |
26 | #include <linux/regulator/consumer.h> |
27 | #include <linux/regulator/driver.h> | |
28 | #include <linux/regulator/machine.h> | |
29 | ||
02fa3ec0 MB |
30 | #define CREATE_TRACE_POINTS |
31 | #include <trace/events/regulator.h> | |
32 | ||
34abbd68 MB |
33 | #include "dummy.h" |
34 | ||
5da84fd9 JP |
35 | #define rdev_err(rdev, fmt, ...) \ |
36 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
37 | #define rdev_warn(rdev, fmt, ...) \ | |
38 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
39 | #define rdev_info(rdev, fmt, ...) \ | |
40 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
41 | #define rdev_dbg(rdev, fmt, ...) \ | |
42 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | ||
414c70cb LG |
44 | static DEFINE_MUTEX(regulator_list_mutex); |
45 | static LIST_HEAD(regulator_list); | |
46 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 47 | static int has_full_constraints; |
688fe99a | 48 | static bool board_wants_dummy_regulator; |
414c70cb | 49 | |
8dc5390d | 50 | /* |
414c70cb LG |
51 | * struct regulator_map |
52 | * | |
53 | * Used to provide symbolic supply names to devices. | |
54 | */ | |
55 | struct regulator_map { | |
56 | struct list_head list; | |
40f9244f | 57 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 58 | const char *supply; |
a5766f11 | 59 | struct regulator_dev *regulator; |
414c70cb LG |
60 | }; |
61 | ||
414c70cb LG |
62 | /* |
63 | * struct regulator | |
64 | * | |
65 | * One for each consumer device. | |
66 | */ | |
67 | struct regulator { | |
68 | struct device *dev; | |
69 | struct list_head list; | |
70 | int uA_load; | |
71 | int min_uV; | |
72 | int max_uV; | |
414c70cb LG |
73 | char *supply_name; |
74 | struct device_attribute dev_attr; | |
75 | struct regulator_dev *rdev; | |
76 | }; | |
77 | ||
78 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
8cbf811d JC |
79 | static int _regulator_disable(struct regulator_dev *rdev, |
80 | struct regulator_dev **supply_rdev_ptr); | |
414c70cb LG |
81 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
82 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
83 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
84 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
85 | unsigned long event, void *data); | |
75790251 MB |
86 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
87 | int min_uV, int max_uV); | |
414c70cb | 88 | |
1083c393 MB |
89 | static const char *rdev_get_name(struct regulator_dev *rdev) |
90 | { | |
91 | if (rdev->constraints && rdev->constraints->name) | |
92 | return rdev->constraints->name; | |
93 | else if (rdev->desc->name) | |
94 | return rdev->desc->name; | |
95 | else | |
96 | return ""; | |
97 | } | |
98 | ||
414c70cb LG |
99 | /* gets the regulator for a given consumer device */ |
100 | static struct regulator *get_device_regulator(struct device *dev) | |
101 | { | |
102 | struct regulator *regulator = NULL; | |
103 | struct regulator_dev *rdev; | |
104 | ||
105 | mutex_lock(®ulator_list_mutex); | |
106 | list_for_each_entry(rdev, ®ulator_list, list) { | |
107 | mutex_lock(&rdev->mutex); | |
108 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
109 | if (regulator->dev == dev) { | |
110 | mutex_unlock(&rdev->mutex); | |
111 | mutex_unlock(®ulator_list_mutex); | |
112 | return regulator; | |
113 | } | |
114 | } | |
115 | mutex_unlock(&rdev->mutex); | |
116 | } | |
117 | mutex_unlock(®ulator_list_mutex); | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | /* Platform voltage constraint check */ | |
122 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
123 | int *min_uV, int *max_uV) | |
124 | { | |
125 | BUG_ON(*min_uV > *max_uV); | |
126 | ||
127 | if (!rdev->constraints) { | |
5da84fd9 | 128 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
129 | return -ENODEV; |
130 | } | |
131 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 132 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
133 | return -EPERM; |
134 | } | |
135 | ||
136 | if (*max_uV > rdev->constraints->max_uV) | |
137 | *max_uV = rdev->constraints->max_uV; | |
138 | if (*min_uV < rdev->constraints->min_uV) | |
139 | *min_uV = rdev->constraints->min_uV; | |
140 | ||
141 | if (*min_uV > *max_uV) | |
142 | return -EINVAL; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
05fda3b1 TP |
147 | /* Make sure we select a voltage that suits the needs of all |
148 | * regulator consumers | |
149 | */ | |
150 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
151 | int *min_uV, int *max_uV) | |
152 | { | |
153 | struct regulator *regulator; | |
154 | ||
155 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
156 | if (*max_uV > regulator->max_uV) | |
157 | *max_uV = regulator->max_uV; | |
158 | if (*min_uV < regulator->min_uV) | |
159 | *min_uV = regulator->min_uV; | |
160 | } | |
161 | ||
162 | if (*min_uV > *max_uV) | |
163 | return -EINVAL; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
414c70cb LG |
168 | /* current constraint check */ |
169 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
170 | int *min_uA, int *max_uA) | |
171 | { | |
172 | BUG_ON(*min_uA > *max_uA); | |
173 | ||
174 | if (!rdev->constraints) { | |
5da84fd9 | 175 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
176 | return -ENODEV; |
177 | } | |
178 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 179 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
180 | return -EPERM; |
181 | } | |
182 | ||
183 | if (*max_uA > rdev->constraints->max_uA) | |
184 | *max_uA = rdev->constraints->max_uA; | |
185 | if (*min_uA < rdev->constraints->min_uA) | |
186 | *min_uA = rdev->constraints->min_uA; | |
187 | ||
188 | if (*min_uA > *max_uA) | |
189 | return -EINVAL; | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | /* operating mode constraint check */ | |
195 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
196 | { | |
e573520b DB |
197 | switch (mode) { |
198 | case REGULATOR_MODE_FAST: | |
199 | case REGULATOR_MODE_NORMAL: | |
200 | case REGULATOR_MODE_IDLE: | |
201 | case REGULATOR_MODE_STANDBY: | |
202 | break; | |
203 | default: | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
414c70cb | 207 | if (!rdev->constraints) { |
5da84fd9 | 208 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
209 | return -ENODEV; |
210 | } | |
211 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 212 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
213 | return -EPERM; |
214 | } | |
215 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
5da84fd9 | 216 | rdev_err(rdev, "invalid mode %x\n", mode); |
414c70cb LG |
217 | return -EINVAL; |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /* dynamic regulator mode switching constraint check */ | |
223 | static int regulator_check_drms(struct regulator_dev *rdev) | |
224 | { | |
225 | if (!rdev->constraints) { | |
5da84fd9 | 226 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
227 | return -ENODEV; |
228 | } | |
229 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 230 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
231 | return -EPERM; |
232 | } | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static ssize_t device_requested_uA_show(struct device *dev, | |
237 | struct device_attribute *attr, char *buf) | |
238 | { | |
239 | struct regulator *regulator; | |
240 | ||
241 | regulator = get_device_regulator(dev); | |
242 | if (regulator == NULL) | |
243 | return 0; | |
244 | ||
245 | return sprintf(buf, "%d\n", regulator->uA_load); | |
246 | } | |
247 | ||
248 | static ssize_t regulator_uV_show(struct device *dev, | |
249 | struct device_attribute *attr, char *buf) | |
250 | { | |
a5766f11 | 251 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
252 | ssize_t ret; |
253 | ||
254 | mutex_lock(&rdev->mutex); | |
255 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
256 | mutex_unlock(&rdev->mutex); | |
257 | ||
258 | return ret; | |
259 | } | |
7ad68e2f | 260 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
261 | |
262 | static ssize_t regulator_uA_show(struct device *dev, | |
263 | struct device_attribute *attr, char *buf) | |
264 | { | |
a5766f11 | 265 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
266 | |
267 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
268 | } | |
7ad68e2f | 269 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 270 | |
bc558a60 MB |
271 | static ssize_t regulator_name_show(struct device *dev, |
272 | struct device_attribute *attr, char *buf) | |
273 | { | |
274 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 275 | |
1083c393 | 276 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
277 | } |
278 | ||
4fca9545 | 279 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 280 | { |
414c70cb LG |
281 | switch (mode) { |
282 | case REGULATOR_MODE_FAST: | |
283 | return sprintf(buf, "fast\n"); | |
284 | case REGULATOR_MODE_NORMAL: | |
285 | return sprintf(buf, "normal\n"); | |
286 | case REGULATOR_MODE_IDLE: | |
287 | return sprintf(buf, "idle\n"); | |
288 | case REGULATOR_MODE_STANDBY: | |
289 | return sprintf(buf, "standby\n"); | |
290 | } | |
291 | return sprintf(buf, "unknown\n"); | |
292 | } | |
293 | ||
4fca9545 DB |
294 | static ssize_t regulator_opmode_show(struct device *dev, |
295 | struct device_attribute *attr, char *buf) | |
414c70cb | 296 | { |
a5766f11 | 297 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 298 | |
4fca9545 DB |
299 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
300 | } | |
7ad68e2f | 301 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
302 | |
303 | static ssize_t regulator_print_state(char *buf, int state) | |
304 | { | |
414c70cb LG |
305 | if (state > 0) |
306 | return sprintf(buf, "enabled\n"); | |
307 | else if (state == 0) | |
308 | return sprintf(buf, "disabled\n"); | |
309 | else | |
310 | return sprintf(buf, "unknown\n"); | |
311 | } | |
312 | ||
4fca9545 DB |
313 | static ssize_t regulator_state_show(struct device *dev, |
314 | struct device_attribute *attr, char *buf) | |
315 | { | |
316 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
317 | ssize_t ret; |
318 | ||
319 | mutex_lock(&rdev->mutex); | |
320 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
321 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 322 | |
9332546f | 323 | return ret; |
4fca9545 | 324 | } |
7ad68e2f | 325 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 326 | |
853116a1 DB |
327 | static ssize_t regulator_status_show(struct device *dev, |
328 | struct device_attribute *attr, char *buf) | |
329 | { | |
330 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
331 | int status; | |
332 | char *label; | |
333 | ||
334 | status = rdev->desc->ops->get_status(rdev); | |
335 | if (status < 0) | |
336 | return status; | |
337 | ||
338 | switch (status) { | |
339 | case REGULATOR_STATUS_OFF: | |
340 | label = "off"; | |
341 | break; | |
342 | case REGULATOR_STATUS_ON: | |
343 | label = "on"; | |
344 | break; | |
345 | case REGULATOR_STATUS_ERROR: | |
346 | label = "error"; | |
347 | break; | |
348 | case REGULATOR_STATUS_FAST: | |
349 | label = "fast"; | |
350 | break; | |
351 | case REGULATOR_STATUS_NORMAL: | |
352 | label = "normal"; | |
353 | break; | |
354 | case REGULATOR_STATUS_IDLE: | |
355 | label = "idle"; | |
356 | break; | |
357 | case REGULATOR_STATUS_STANDBY: | |
358 | label = "standby"; | |
359 | break; | |
360 | default: | |
361 | return -ERANGE; | |
362 | } | |
363 | ||
364 | return sprintf(buf, "%s\n", label); | |
365 | } | |
366 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
367 | ||
414c70cb LG |
368 | static ssize_t regulator_min_uA_show(struct device *dev, |
369 | struct device_attribute *attr, char *buf) | |
370 | { | |
a5766f11 | 371 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
372 | |
373 | if (!rdev->constraints) | |
374 | return sprintf(buf, "constraint not defined\n"); | |
375 | ||
376 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
377 | } | |
7ad68e2f | 378 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
379 | |
380 | static ssize_t regulator_max_uA_show(struct device *dev, | |
381 | struct device_attribute *attr, char *buf) | |
382 | { | |
a5766f11 | 383 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
384 | |
385 | if (!rdev->constraints) | |
386 | return sprintf(buf, "constraint not defined\n"); | |
387 | ||
388 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
389 | } | |
7ad68e2f | 390 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
391 | |
392 | static ssize_t regulator_min_uV_show(struct device *dev, | |
393 | struct device_attribute *attr, char *buf) | |
394 | { | |
a5766f11 | 395 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
396 | |
397 | if (!rdev->constraints) | |
398 | return sprintf(buf, "constraint not defined\n"); | |
399 | ||
400 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
401 | } | |
7ad68e2f | 402 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
403 | |
404 | static ssize_t regulator_max_uV_show(struct device *dev, | |
405 | struct device_attribute *attr, char *buf) | |
406 | { | |
a5766f11 | 407 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
408 | |
409 | if (!rdev->constraints) | |
410 | return sprintf(buf, "constraint not defined\n"); | |
411 | ||
412 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
413 | } | |
7ad68e2f | 414 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
415 | |
416 | static ssize_t regulator_total_uA_show(struct device *dev, | |
417 | struct device_attribute *attr, char *buf) | |
418 | { | |
a5766f11 | 419 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
420 | struct regulator *regulator; |
421 | int uA = 0; | |
422 | ||
423 | mutex_lock(&rdev->mutex); | |
424 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 425 | uA += regulator->uA_load; |
414c70cb LG |
426 | mutex_unlock(&rdev->mutex); |
427 | return sprintf(buf, "%d\n", uA); | |
428 | } | |
7ad68e2f | 429 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
430 | |
431 | static ssize_t regulator_num_users_show(struct device *dev, | |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | return sprintf(buf, "%d\n", rdev->use_count); |
436 | } | |
437 | ||
438 | static ssize_t regulator_type_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 | switch (rdev->desc->type) { | |
444 | case REGULATOR_VOLTAGE: | |
445 | return sprintf(buf, "voltage\n"); | |
446 | case REGULATOR_CURRENT: | |
447 | return sprintf(buf, "current\n"); | |
448 | } | |
449 | return sprintf(buf, "unknown\n"); | |
450 | } | |
451 | ||
452 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
453 | struct device_attribute *attr, char *buf) | |
454 | { | |
a5766f11 | 455 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 456 | |
414c70cb LG |
457 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
458 | } | |
7ad68e2f DB |
459 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
460 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
461 | |
462 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
463 | struct device_attribute *attr, char *buf) | |
464 | { | |
a5766f11 | 465 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 466 | |
414c70cb LG |
467 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
468 | } | |
7ad68e2f DB |
469 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
470 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
471 | |
472 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
473 | struct device_attribute *attr, char *buf) | |
474 | { | |
a5766f11 | 475 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 476 | |
414c70cb LG |
477 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
478 | } | |
7ad68e2f DB |
479 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
480 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 481 | |
414c70cb LG |
482 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
483 | struct device_attribute *attr, char *buf) | |
484 | { | |
a5766f11 | 485 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 486 | |
4fca9545 DB |
487 | return regulator_print_opmode(buf, |
488 | rdev->constraints->state_mem.mode); | |
414c70cb | 489 | } |
7ad68e2f DB |
490 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
491 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
492 | |
493 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
494 | struct device_attribute *attr, char *buf) | |
495 | { | |
a5766f11 | 496 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 497 | |
4fca9545 DB |
498 | return regulator_print_opmode(buf, |
499 | rdev->constraints->state_disk.mode); | |
414c70cb | 500 | } |
7ad68e2f DB |
501 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
502 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
503 | |
504 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
505 | struct device_attribute *attr, char *buf) | |
506 | { | |
a5766f11 | 507 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 508 | |
4fca9545 DB |
509 | return regulator_print_opmode(buf, |
510 | rdev->constraints->state_standby.mode); | |
414c70cb | 511 | } |
7ad68e2f DB |
512 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
513 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
514 | |
515 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
516 | struct device_attribute *attr, char *buf) | |
517 | { | |
a5766f11 | 518 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 519 | |
4fca9545 DB |
520 | return regulator_print_state(buf, |
521 | rdev->constraints->state_mem.enabled); | |
414c70cb | 522 | } |
7ad68e2f DB |
523 | static DEVICE_ATTR(suspend_mem_state, 0444, |
524 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
525 | |
526 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
527 | struct device_attribute *attr, char *buf) | |
528 | { | |
a5766f11 | 529 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 530 | |
4fca9545 DB |
531 | return regulator_print_state(buf, |
532 | rdev->constraints->state_disk.enabled); | |
414c70cb | 533 | } |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_disk_state, 0444, |
535 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
4fca9545 DB |
542 | return regulator_print_state(buf, |
543 | rdev->constraints->state_standby.enabled); | |
414c70cb | 544 | } |
7ad68e2f DB |
545 | static DEVICE_ATTR(suspend_standby_state, 0444, |
546 | regulator_suspend_standby_state_show, NULL); | |
547 | ||
bc558a60 | 548 | |
7ad68e2f DB |
549 | /* |
550 | * These are the only attributes are present for all regulators. | |
551 | * Other attributes are a function of regulator functionality. | |
552 | */ | |
414c70cb | 553 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 554 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
555 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
556 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
557 | __ATTR_NULL, |
558 | }; | |
559 | ||
560 | static void regulator_dev_release(struct device *dev) | |
561 | { | |
a5766f11 | 562 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
563 | kfree(rdev); |
564 | } | |
565 | ||
566 | static struct class regulator_class = { | |
567 | .name = "regulator", | |
568 | .dev_release = regulator_dev_release, | |
569 | .dev_attrs = regulator_dev_attrs, | |
570 | }; | |
571 | ||
572 | /* Calculate the new optimum regulator operating mode based on the new total | |
573 | * consumer load. All locks held by caller */ | |
574 | static void drms_uA_update(struct regulator_dev *rdev) | |
575 | { | |
576 | struct regulator *sibling; | |
577 | int current_uA = 0, output_uV, input_uV, err; | |
578 | unsigned int mode; | |
579 | ||
580 | err = regulator_check_drms(rdev); | |
581 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
582 | (!rdev->desc->ops->get_voltage && |
583 | !rdev->desc->ops->get_voltage_sel) || | |
584 | !rdev->desc->ops->set_mode) | |
036de8ef | 585 | return; |
414c70cb LG |
586 | |
587 | /* get output voltage */ | |
1bf5a1f8 | 588 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
589 | if (output_uV <= 0) |
590 | return; | |
591 | ||
592 | /* get input voltage */ | |
1bf5a1f8 MB |
593 | input_uV = 0; |
594 | if (rdev->supply) | |
595 | input_uV = _regulator_get_voltage(rdev); | |
596 | if (input_uV <= 0) | |
414c70cb LG |
597 | input_uV = rdev->constraints->input_uV; |
598 | if (input_uV <= 0) | |
599 | return; | |
600 | ||
601 | /* calc total requested load */ | |
602 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 603 | current_uA += sibling->uA_load; |
414c70cb LG |
604 | |
605 | /* now get the optimum mode for our new total regulator load */ | |
606 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
607 | output_uV, current_uA); | |
608 | ||
609 | /* check the new mode is allowed */ | |
610 | err = regulator_check_mode(rdev, mode); | |
611 | if (err == 0) | |
612 | rdev->desc->ops->set_mode(rdev, mode); | |
613 | } | |
614 | ||
615 | static int suspend_set_state(struct regulator_dev *rdev, | |
616 | struct regulator_state *rstate) | |
617 | { | |
618 | int ret = 0; | |
638f85c5 MB |
619 | bool can_set_state; |
620 | ||
621 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
622 | rdev->desc->ops->set_suspend_disable; | |
623 | ||
624 | /* If we have no suspend mode configration don't set anything; | |
625 | * only warn if the driver actually makes the suspend mode | |
626 | * configurable. | |
627 | */ | |
628 | if (!rstate->enabled && !rstate->disabled) { | |
629 | if (can_set_state) | |
5da84fd9 | 630 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
631 | return 0; |
632 | } | |
633 | ||
634 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 635 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
636 | return -EINVAL; |
637 | } | |
414c70cb | 638 | |
638f85c5 | 639 | if (!can_set_state) { |
5da84fd9 | 640 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 641 | return -EINVAL; |
a5766f11 | 642 | } |
414c70cb LG |
643 | |
644 | if (rstate->enabled) | |
645 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
646 | else | |
647 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
648 | if (ret < 0) { | |
5da84fd9 | 649 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
650 | return ret; |
651 | } | |
652 | ||
653 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
654 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
655 | if (ret < 0) { | |
5da84fd9 | 656 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
657 | return ret; |
658 | } | |
659 | } | |
660 | ||
661 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
662 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
663 | if (ret < 0) { | |
5da84fd9 | 664 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
665 | return ret; |
666 | } | |
667 | } | |
668 | return ret; | |
669 | } | |
670 | ||
671 | /* locks held by caller */ | |
672 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
673 | { | |
674 | if (!rdev->constraints) | |
675 | return -EINVAL; | |
676 | ||
677 | switch (state) { | |
678 | case PM_SUSPEND_STANDBY: | |
679 | return suspend_set_state(rdev, | |
680 | &rdev->constraints->state_standby); | |
681 | case PM_SUSPEND_MEM: | |
682 | return suspend_set_state(rdev, | |
683 | &rdev->constraints->state_mem); | |
684 | case PM_SUSPEND_MAX: | |
685 | return suspend_set_state(rdev, | |
686 | &rdev->constraints->state_disk); | |
687 | default: | |
688 | return -EINVAL; | |
689 | } | |
690 | } | |
691 | ||
692 | static void print_constraints(struct regulator_dev *rdev) | |
693 | { | |
694 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 695 | char buf[80] = ""; |
8f031b48 MB |
696 | int count = 0; |
697 | int ret; | |
414c70cb | 698 | |
8f031b48 | 699 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 700 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
701 | count += sprintf(buf + count, "%d mV ", |
702 | constraints->min_uV / 1000); | |
414c70cb | 703 | else |
8f031b48 MB |
704 | count += sprintf(buf + count, "%d <--> %d mV ", |
705 | constraints->min_uV / 1000, | |
706 | constraints->max_uV / 1000); | |
707 | } | |
708 | ||
709 | if (!constraints->min_uV || | |
710 | constraints->min_uV != constraints->max_uV) { | |
711 | ret = _regulator_get_voltage(rdev); | |
712 | if (ret > 0) | |
713 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
714 | } | |
715 | ||
716 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 717 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
718 | count += sprintf(buf + count, "%d mA ", |
719 | constraints->min_uA / 1000); | |
414c70cb | 720 | else |
8f031b48 MB |
721 | count += sprintf(buf + count, "%d <--> %d mA ", |
722 | constraints->min_uA / 1000, | |
723 | constraints->max_uA / 1000); | |
724 | } | |
725 | ||
726 | if (!constraints->min_uA || | |
727 | constraints->min_uA != constraints->max_uA) { | |
728 | ret = _regulator_get_current_limit(rdev); | |
729 | if (ret > 0) | |
e4a6376b | 730 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 731 | } |
8f031b48 | 732 | |
414c70cb LG |
733 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
734 | count += sprintf(buf + count, "fast "); | |
735 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
736 | count += sprintf(buf + count, "normal "); | |
737 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
738 | count += sprintf(buf + count, "idle "); | |
739 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
740 | count += sprintf(buf + count, "standby"); | |
741 | ||
5da84fd9 | 742 | rdev_info(rdev, "regulator: %s\n", buf); |
414c70cb LG |
743 | } |
744 | ||
e79055d6 | 745 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 746 | struct regulation_constraints *constraints) |
a5766f11 | 747 | { |
e5fda26c | 748 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
749 | int ret; |
750 | ||
751 | /* do we need to apply the constraint voltage */ | |
752 | if (rdev->constraints->apply_uV && | |
75790251 MB |
753 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
754 | ret = _regulator_do_set_voltage(rdev, | |
755 | rdev->constraints->min_uV, | |
756 | rdev->constraints->max_uV); | |
757 | if (ret < 0) { | |
758 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
759 | rdev->constraints->min_uV); | |
760 | rdev->constraints = NULL; | |
761 | return ret; | |
762 | } | |
af5866c9 | 763 | } |
e06f5b4f | 764 | |
4367cfdc DB |
765 | /* constrain machine-level voltage specs to fit |
766 | * the actual range supported by this regulator. | |
767 | */ | |
768 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
769 | int count = rdev->desc->n_voltages; | |
770 | int i; | |
771 | int min_uV = INT_MAX; | |
772 | int max_uV = INT_MIN; | |
773 | int cmin = constraints->min_uV; | |
774 | int cmax = constraints->max_uV; | |
775 | ||
3e590918 MB |
776 | /* it's safe to autoconfigure fixed-voltage supplies |
777 | and the constraints are used by list_voltage. */ | |
4367cfdc | 778 | if (count == 1 && !cmin) { |
3e590918 | 779 | cmin = 1; |
4367cfdc | 780 | cmax = INT_MAX; |
3e590918 MB |
781 | constraints->min_uV = cmin; |
782 | constraints->max_uV = cmax; | |
4367cfdc DB |
783 | } |
784 | ||
3e2b9abd MB |
785 | /* voltage constraints are optional */ |
786 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 787 | return 0; |
3e2b9abd | 788 | |
4367cfdc | 789 | /* else require explicit machine-level constraints */ |
3e2b9abd | 790 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 791 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 792 | return -EINVAL; |
4367cfdc DB |
793 | } |
794 | ||
795 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
796 | for (i = 0; i < count; i++) { | |
797 | int value; | |
798 | ||
799 | value = ops->list_voltage(rdev, i); | |
800 | if (value <= 0) | |
801 | continue; | |
802 | ||
803 | /* maybe adjust [min_uV..max_uV] */ | |
804 | if (value >= cmin && value < min_uV) | |
805 | min_uV = value; | |
806 | if (value <= cmax && value > max_uV) | |
807 | max_uV = value; | |
808 | } | |
809 | ||
810 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
811 | if (max_uV < min_uV) { | |
5da84fd9 | 812 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 813 | return -EINVAL; |
4367cfdc DB |
814 | } |
815 | ||
816 | /* use regulator's subset of machine constraints */ | |
817 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
818 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
819 | constraints->min_uV, min_uV); | |
4367cfdc DB |
820 | constraints->min_uV = min_uV; |
821 | } | |
822 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
823 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
824 | constraints->max_uV, max_uV); | |
4367cfdc DB |
825 | constraints->max_uV = max_uV; |
826 | } | |
827 | } | |
828 | ||
e79055d6 MB |
829 | return 0; |
830 | } | |
831 | ||
832 | /** | |
833 | * set_machine_constraints - sets regulator constraints | |
834 | * @rdev: regulator source | |
835 | * @constraints: constraints to apply | |
836 | * | |
837 | * Allows platform initialisation code to define and constrain | |
838 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
839 | * Constraints *must* be set by platform code in order for some | |
840 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
841 | * set_mode. | |
842 | */ | |
843 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 844 | const struct regulation_constraints *constraints) |
e79055d6 MB |
845 | { |
846 | int ret = 0; | |
e79055d6 MB |
847 | struct regulator_ops *ops = rdev->desc->ops; |
848 | ||
f8c12fe3 MB |
849 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
850 | GFP_KERNEL); | |
851 | if (!rdev->constraints) | |
852 | return -ENOMEM; | |
af5866c9 | 853 | |
f8c12fe3 | 854 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
855 | if (ret != 0) |
856 | goto out; | |
857 | ||
a5766f11 | 858 | /* do we need to setup our suspend state */ |
e06f5b4f | 859 | if (constraints->initial_state) { |
f8c12fe3 | 860 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 861 | if (ret < 0) { |
5da84fd9 | 862 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
863 | rdev->constraints = NULL; |
864 | goto out; | |
865 | } | |
866 | } | |
a5766f11 | 867 | |
a308466c MB |
868 | if (constraints->initial_mode) { |
869 | if (!ops->set_mode) { | |
5da84fd9 | 870 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
871 | ret = -EINVAL; |
872 | goto out; | |
873 | } | |
874 | ||
f8c12fe3 | 875 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 876 | if (ret < 0) { |
5da84fd9 | 877 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
878 | goto out; |
879 | } | |
880 | } | |
881 | ||
cacf90f2 MB |
882 | /* If the constraints say the regulator should be on at this point |
883 | * and we have control then make sure it is enabled. | |
884 | */ | |
f8c12fe3 MB |
885 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
886 | ops->enable) { | |
e5fda26c MB |
887 | ret = ops->enable(rdev); |
888 | if (ret < 0) { | |
5da84fd9 | 889 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
890 | rdev->constraints = NULL; |
891 | goto out; | |
892 | } | |
893 | } | |
894 | ||
a5766f11 LG |
895 | print_constraints(rdev); |
896 | out: | |
897 | return ret; | |
898 | } | |
899 | ||
900 | /** | |
901 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
902 | * @rdev: regulator name |
903 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
904 | * |
905 | * Called by platform initialisation code to set the supply regulator for this | |
906 | * regulator. This ensures that a regulators supply will also be enabled by the | |
907 | * core if it's child is enabled. | |
908 | */ | |
909 | static int set_supply(struct regulator_dev *rdev, | |
910 | struct regulator_dev *supply_rdev) | |
911 | { | |
912 | int err; | |
913 | ||
914 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
915 | "supply"); | |
916 | if (err) { | |
5da84fd9 JP |
917 | rdev_err(rdev, "could not add device link %s err %d\n", |
918 | supply_rdev->dev.kobj.name, err); | |
a5766f11 LG |
919 | goto out; |
920 | } | |
921 | rdev->supply = supply_rdev; | |
922 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
923 | out: | |
924 | return err; | |
925 | } | |
926 | ||
927 | /** | |
06c63f93 | 928 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
929 | * @rdev: regulator source |
930 | * @consumer_dev: device the supply applies to | |
40f9244f | 931 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 932 | * @supply: symbolic name for supply |
a5766f11 LG |
933 | * |
934 | * Allows platform initialisation code to map physical regulator | |
935 | * sources to symbolic names for supplies for use by devices. Devices | |
936 | * should use these symbolic names to request regulators, avoiding the | |
937 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
938 | * |
939 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
940 | */ |
941 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
942 | struct device *consumer_dev, const char *consumer_dev_name, |
943 | const char *supply) | |
a5766f11 LG |
944 | { |
945 | struct regulator_map *node; | |
9ed2099e | 946 | int has_dev; |
a5766f11 | 947 | |
40f9244f MB |
948 | if (consumer_dev && consumer_dev_name) |
949 | return -EINVAL; | |
950 | ||
951 | if (!consumer_dev_name && consumer_dev) | |
952 | consumer_dev_name = dev_name(consumer_dev); | |
953 | ||
a5766f11 LG |
954 | if (supply == NULL) |
955 | return -EINVAL; | |
956 | ||
9ed2099e MB |
957 | if (consumer_dev_name != NULL) |
958 | has_dev = 1; | |
959 | else | |
960 | has_dev = 0; | |
961 | ||
6001e13c | 962 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
963 | if (node->dev_name && consumer_dev_name) { |
964 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
965 | continue; | |
966 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 967 | continue; |
23b5cc2a JN |
968 | } |
969 | ||
6001e13c DB |
970 | if (strcmp(node->supply, supply) != 0) |
971 | continue; | |
972 | ||
973 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
974 | dev_name(&node->regulator->dev), |
975 | node->regulator->desc->name, | |
976 | supply, | |
977 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
978 | return -EBUSY; |
979 | } | |
980 | ||
9ed2099e | 981 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
982 | if (node == NULL) |
983 | return -ENOMEM; | |
984 | ||
985 | node->regulator = rdev; | |
a5766f11 LG |
986 | node->supply = supply; |
987 | ||
9ed2099e MB |
988 | if (has_dev) { |
989 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
990 | if (node->dev_name == NULL) { | |
991 | kfree(node); | |
992 | return -ENOMEM; | |
993 | } | |
40f9244f MB |
994 | } |
995 | ||
a5766f11 LG |
996 | list_add(&node->list, ®ulator_map_list); |
997 | return 0; | |
998 | } | |
999 | ||
0f1d747b MR |
1000 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1001 | { | |
1002 | struct regulator_map *node, *n; | |
1003 | ||
1004 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1005 | if (rdev == node->regulator) { | |
1006 | list_del(&node->list); | |
40f9244f | 1007 | kfree(node->dev_name); |
0f1d747b | 1008 | kfree(node); |
0f1d747b MR |
1009 | } |
1010 | } | |
1011 | } | |
1012 | ||
414c70cb LG |
1013 | #define REG_STR_SIZE 32 |
1014 | ||
1015 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1016 | struct device *dev, | |
1017 | const char *supply_name) | |
1018 | { | |
1019 | struct regulator *regulator; | |
1020 | char buf[REG_STR_SIZE]; | |
1021 | int err, size; | |
1022 | ||
1023 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1024 | if (regulator == NULL) | |
1025 | return NULL; | |
1026 | ||
1027 | mutex_lock(&rdev->mutex); | |
1028 | regulator->rdev = rdev; | |
1029 | list_add(®ulator->list, &rdev->consumer_list); | |
1030 | ||
1031 | if (dev) { | |
1032 | /* create a 'requested_microamps_name' sysfs entry */ | |
1033 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1034 | supply_name); | |
1035 | if (size >= REG_STR_SIZE) | |
1036 | goto overflow_err; | |
1037 | ||
1038 | regulator->dev = dev; | |
4f26a2ab | 1039 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1040 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1041 | if (regulator->dev_attr.attr.name == NULL) | |
1042 | goto attr_name_err; | |
1043 | ||
414c70cb LG |
1044 | regulator->dev_attr.attr.mode = 0444; |
1045 | regulator->dev_attr.show = device_requested_uA_show; | |
1046 | err = device_create_file(dev, ®ulator->dev_attr); | |
1047 | if (err < 0) { | |
5da84fd9 | 1048 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1049 | goto attr_name_err; |
1050 | } | |
1051 | ||
1052 | /* also add a link to the device sysfs entry */ | |
1053 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1054 | dev->kobj.name, supply_name); | |
1055 | if (size >= REG_STR_SIZE) | |
1056 | goto attr_err; | |
1057 | ||
1058 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1059 | if (regulator->supply_name == NULL) | |
1060 | goto attr_err; | |
1061 | ||
1062 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1063 | buf); | |
1064 | if (err) { | |
5da84fd9 JP |
1065 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1066 | dev->kobj.name, err); | |
414c70cb LG |
1067 | goto link_name_err; |
1068 | } | |
1069 | } | |
1070 | mutex_unlock(&rdev->mutex); | |
1071 | return regulator; | |
1072 | link_name_err: | |
1073 | kfree(regulator->supply_name); | |
1074 | attr_err: | |
1075 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1076 | attr_name_err: | |
1077 | kfree(regulator->dev_attr.attr.name); | |
1078 | overflow_err: | |
1079 | list_del(®ulator->list); | |
1080 | kfree(regulator); | |
1081 | mutex_unlock(&rdev->mutex); | |
1082 | return NULL; | |
1083 | } | |
1084 | ||
31aae2be MB |
1085 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1086 | { | |
1087 | if (!rdev->desc->ops->enable_time) | |
1088 | return 0; | |
1089 | return rdev->desc->ops->enable_time(rdev); | |
1090 | } | |
1091 | ||
5ffbd136 MB |
1092 | /* Internal regulator request function */ |
1093 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1094 | int exclusive) | |
414c70cb LG |
1095 | { |
1096 | struct regulator_dev *rdev; | |
1097 | struct regulator_map *map; | |
1098 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1099 | const char *devname = NULL; |
5ffbd136 | 1100 | int ret; |
414c70cb LG |
1101 | |
1102 | if (id == NULL) { | |
5da84fd9 | 1103 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1104 | return regulator; |
1105 | } | |
1106 | ||
40f9244f MB |
1107 | if (dev) |
1108 | devname = dev_name(dev); | |
1109 | ||
414c70cb LG |
1110 | mutex_lock(®ulator_list_mutex); |
1111 | ||
1112 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1113 | /* If the mapping has a device set up it must match */ |
1114 | if (map->dev_name && | |
1115 | (!devname || strcmp(map->dev_name, devname))) | |
1116 | continue; | |
1117 | ||
1118 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1119 | rdev = map->regulator; |
414c70cb | 1120 | goto found; |
a5766f11 | 1121 | } |
414c70cb | 1122 | } |
34abbd68 | 1123 | |
688fe99a MB |
1124 | if (board_wants_dummy_regulator) { |
1125 | rdev = dummy_regulator_rdev; | |
1126 | goto found; | |
1127 | } | |
1128 | ||
34abbd68 MB |
1129 | #ifdef CONFIG_REGULATOR_DUMMY |
1130 | if (!devname) | |
1131 | devname = "deviceless"; | |
1132 | ||
1133 | /* If the board didn't flag that it was fully constrained then | |
1134 | * substitute in a dummy regulator so consumers can continue. | |
1135 | */ | |
1136 | if (!has_full_constraints) { | |
5da84fd9 JP |
1137 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1138 | devname, id); | |
34abbd68 MB |
1139 | rdev = dummy_regulator_rdev; |
1140 | goto found; | |
1141 | } | |
1142 | #endif | |
1143 | ||
414c70cb LG |
1144 | mutex_unlock(®ulator_list_mutex); |
1145 | return regulator; | |
1146 | ||
1147 | found: | |
5ffbd136 MB |
1148 | if (rdev->exclusive) { |
1149 | regulator = ERR_PTR(-EPERM); | |
1150 | goto out; | |
1151 | } | |
1152 | ||
1153 | if (exclusive && rdev->open_count) { | |
1154 | regulator = ERR_PTR(-EBUSY); | |
1155 | goto out; | |
1156 | } | |
1157 | ||
a5766f11 LG |
1158 | if (!try_module_get(rdev->owner)) |
1159 | goto out; | |
1160 | ||
414c70cb LG |
1161 | regulator = create_regulator(rdev, dev, id); |
1162 | if (regulator == NULL) { | |
1163 | regulator = ERR_PTR(-ENOMEM); | |
1164 | module_put(rdev->owner); | |
1165 | } | |
1166 | ||
5ffbd136 MB |
1167 | rdev->open_count++; |
1168 | if (exclusive) { | |
1169 | rdev->exclusive = 1; | |
1170 | ||
1171 | ret = _regulator_is_enabled(rdev); | |
1172 | if (ret > 0) | |
1173 | rdev->use_count = 1; | |
1174 | else | |
1175 | rdev->use_count = 0; | |
1176 | } | |
1177 | ||
a5766f11 | 1178 | out: |
414c70cb | 1179 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1180 | |
414c70cb LG |
1181 | return regulator; |
1182 | } | |
5ffbd136 MB |
1183 | |
1184 | /** | |
1185 | * regulator_get - lookup and obtain a reference to a regulator. | |
1186 | * @dev: device for regulator "consumer" | |
1187 | * @id: Supply name or regulator ID. | |
1188 | * | |
1189 | * Returns a struct regulator corresponding to the regulator producer, | |
1190 | * or IS_ERR() condition containing errno. | |
1191 | * | |
1192 | * Use of supply names configured via regulator_set_device_supply() is | |
1193 | * strongly encouraged. It is recommended that the supply name used | |
1194 | * should match the name used for the supply and/or the relevant | |
1195 | * device pins in the datasheet. | |
1196 | */ | |
1197 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1198 | { | |
1199 | return _regulator_get(dev, id, 0); | |
1200 | } | |
414c70cb LG |
1201 | EXPORT_SYMBOL_GPL(regulator_get); |
1202 | ||
5ffbd136 MB |
1203 | /** |
1204 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1205 | * @dev: device for regulator "consumer" | |
1206 | * @id: Supply name or regulator ID. | |
1207 | * | |
1208 | * Returns a struct regulator corresponding to the regulator producer, | |
1209 | * or IS_ERR() condition containing errno. Other consumers will be | |
1210 | * unable to obtain this reference is held and the use count for the | |
1211 | * regulator will be initialised to reflect the current state of the | |
1212 | * regulator. | |
1213 | * | |
1214 | * This is intended for use by consumers which cannot tolerate shared | |
1215 | * use of the regulator such as those which need to force the | |
1216 | * regulator off for correct operation of the hardware they are | |
1217 | * controlling. | |
1218 | * | |
1219 | * Use of supply names configured via regulator_set_device_supply() is | |
1220 | * strongly encouraged. It is recommended that the supply name used | |
1221 | * should match the name used for the supply and/or the relevant | |
1222 | * device pins in the datasheet. | |
1223 | */ | |
1224 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1225 | { | |
1226 | return _regulator_get(dev, id, 1); | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1229 | ||
414c70cb LG |
1230 | /** |
1231 | * regulator_put - "free" the regulator source | |
1232 | * @regulator: regulator source | |
1233 | * | |
1234 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1235 | * regulator source are balanced by regulator_disable calls prior to calling | |
1236 | * this function. | |
1237 | */ | |
1238 | void regulator_put(struct regulator *regulator) | |
1239 | { | |
1240 | struct regulator_dev *rdev; | |
1241 | ||
1242 | if (regulator == NULL || IS_ERR(regulator)) | |
1243 | return; | |
1244 | ||
414c70cb LG |
1245 | mutex_lock(®ulator_list_mutex); |
1246 | rdev = regulator->rdev; | |
1247 | ||
1248 | /* remove any sysfs entries */ | |
1249 | if (regulator->dev) { | |
1250 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1251 | kfree(regulator->supply_name); | |
1252 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1253 | kfree(regulator->dev_attr.attr.name); | |
1254 | } | |
1255 | list_del(®ulator->list); | |
1256 | kfree(regulator); | |
1257 | ||
5ffbd136 MB |
1258 | rdev->open_count--; |
1259 | rdev->exclusive = 0; | |
1260 | ||
414c70cb LG |
1261 | module_put(rdev->owner); |
1262 | mutex_unlock(®ulator_list_mutex); | |
1263 | } | |
1264 | EXPORT_SYMBOL_GPL(regulator_put); | |
1265 | ||
9a2372fa MB |
1266 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1267 | { | |
1268 | if (!rdev->constraints) | |
1269 | return 0; | |
1270 | ||
1271 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1272 | return 1; | |
1273 | else | |
1274 | return 0; | |
1275 | } | |
1276 | ||
414c70cb LG |
1277 | /* locks held by regulator_enable() */ |
1278 | static int _regulator_enable(struct regulator_dev *rdev) | |
1279 | { | |
31aae2be | 1280 | int ret, delay; |
414c70cb | 1281 | |
acaf6ffe BJ |
1282 | if (rdev->use_count == 0) { |
1283 | /* do we need to enable the supply regulator first */ | |
1284 | if (rdev->supply) { | |
1285 | mutex_lock(&rdev->supply->mutex); | |
1286 | ret = _regulator_enable(rdev->supply); | |
1287 | mutex_unlock(&rdev->supply->mutex); | |
1288 | if (ret < 0) { | |
5da84fd9 | 1289 | rdev_err(rdev, "failed to enable: %d\n", ret); |
acaf6ffe BJ |
1290 | return ret; |
1291 | } | |
414c70cb LG |
1292 | } |
1293 | } | |
1294 | ||
1295 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1296 | if (rdev->constraints && |
1297 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1298 | drms_uA_update(rdev); | |
414c70cb | 1299 | |
9a2372fa MB |
1300 | if (rdev->use_count == 0) { |
1301 | /* The regulator may on if it's not switchable or left on */ | |
1302 | ret = _regulator_is_enabled(rdev); | |
1303 | if (ret == -EINVAL || ret == 0) { | |
1304 | if (!_regulator_can_change_status(rdev)) | |
1305 | return -EPERM; | |
1306 | ||
31aae2be | 1307 | if (!rdev->desc->ops->enable) |
9a2372fa | 1308 | return -EINVAL; |
31aae2be MB |
1309 | |
1310 | /* Query before enabling in case configuration | |
1311 | * dependant. */ | |
1312 | ret = _regulator_get_enable_time(rdev); | |
1313 | if (ret >= 0) { | |
1314 | delay = ret; | |
1315 | } else { | |
5da84fd9 | 1316 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1317 | ret); |
31aae2be | 1318 | delay = 0; |
9a2372fa | 1319 | } |
31aae2be | 1320 | |
02fa3ec0 MB |
1321 | trace_regulator_enable(rdev_get_name(rdev)); |
1322 | ||
31aae2be MB |
1323 | /* Allow the regulator to ramp; it would be useful |
1324 | * to extend this for bulk operations so that the | |
1325 | * regulators can ramp together. */ | |
1326 | ret = rdev->desc->ops->enable(rdev); | |
1327 | if (ret < 0) | |
1328 | return ret; | |
1329 | ||
02fa3ec0 MB |
1330 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1331 | ||
e36c1df8 | 1332 | if (delay >= 1000) { |
31aae2be | 1333 | mdelay(delay / 1000); |
e36c1df8 AL |
1334 | udelay(delay % 1000); |
1335 | } else if (delay) { | |
31aae2be | 1336 | udelay(delay); |
e36c1df8 | 1337 | } |
31aae2be | 1338 | |
02fa3ec0 MB |
1339 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1340 | ||
a7433cff | 1341 | } else if (ret < 0) { |
5da84fd9 | 1342 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1343 | return ret; |
1344 | } | |
a7433cff | 1345 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1346 | } |
1347 | ||
9a2372fa MB |
1348 | rdev->use_count++; |
1349 | ||
1350 | return 0; | |
414c70cb LG |
1351 | } |
1352 | ||
1353 | /** | |
1354 | * regulator_enable - enable regulator output | |
1355 | * @regulator: regulator source | |
1356 | * | |
cf7bbcdf MB |
1357 | * Request that the regulator be enabled with the regulator output at |
1358 | * the predefined voltage or current value. Calls to regulator_enable() | |
1359 | * must be balanced with calls to regulator_disable(). | |
1360 | * | |
414c70cb | 1361 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1362 | * hardwired in the regulator. |
414c70cb LG |
1363 | */ |
1364 | int regulator_enable(struct regulator *regulator) | |
1365 | { | |
412aec61 DB |
1366 | struct regulator_dev *rdev = regulator->rdev; |
1367 | int ret = 0; | |
414c70cb | 1368 | |
412aec61 | 1369 | mutex_lock(&rdev->mutex); |
cd94b505 | 1370 | ret = _regulator_enable(rdev); |
412aec61 | 1371 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1372 | return ret; |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1375 | ||
1376 | /* locks held by regulator_disable() */ | |
8cbf811d JC |
1377 | static int _regulator_disable(struct regulator_dev *rdev, |
1378 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1379 | { |
1380 | int ret = 0; | |
b12a1e29 | 1381 | *supply_rdev_ptr = NULL; |
414c70cb | 1382 | |
cd94b505 | 1383 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1384 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1385 | return -EIO; |
1386 | ||
414c70cb | 1387 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1388 | if (rdev->use_count == 1 && |
1389 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1390 | |
1391 | /* we are last user */ | |
9a2372fa MB |
1392 | if (_regulator_can_change_status(rdev) && |
1393 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1394 | trace_regulator_disable(rdev_get_name(rdev)); |
1395 | ||
414c70cb LG |
1396 | ret = rdev->desc->ops->disable(rdev); |
1397 | if (ret < 0) { | |
5da84fd9 | 1398 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1399 | return ret; |
1400 | } | |
84b68263 | 1401 | |
02fa3ec0 MB |
1402 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1403 | ||
84b68263 MB |
1404 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1405 | NULL); | |
414c70cb LG |
1406 | } |
1407 | ||
1408 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1409 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1410 | |
1411 | rdev->use_count = 0; | |
1412 | } else if (rdev->use_count > 1) { | |
1413 | ||
1414 | if (rdev->constraints && | |
1415 | (rdev->constraints->valid_ops_mask & | |
1416 | REGULATOR_CHANGE_DRMS)) | |
1417 | drms_uA_update(rdev); | |
1418 | ||
1419 | rdev->use_count--; | |
1420 | } | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | /** | |
1425 | * regulator_disable - disable regulator output | |
1426 | * @regulator: regulator source | |
1427 | * | |
cf7bbcdf MB |
1428 | * Disable the regulator output voltage or current. Calls to |
1429 | * regulator_enable() must be balanced with calls to | |
1430 | * regulator_disable(). | |
69279fb9 | 1431 | * |
414c70cb | 1432 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1433 | * devices have it enabled, the regulator device supports disabling and |
1434 | * machine constraints permit this operation. | |
414c70cb LG |
1435 | */ |
1436 | int regulator_disable(struct regulator *regulator) | |
1437 | { | |
412aec61 | 1438 | struct regulator_dev *rdev = regulator->rdev; |
8cbf811d | 1439 | struct regulator_dev *supply_rdev = NULL; |
412aec61 | 1440 | int ret = 0; |
414c70cb | 1441 | |
412aec61 | 1442 | mutex_lock(&rdev->mutex); |
8cbf811d | 1443 | ret = _regulator_disable(rdev, &supply_rdev); |
412aec61 | 1444 | mutex_unlock(&rdev->mutex); |
8cbf811d JC |
1445 | |
1446 | /* decrease our supplies ref count and disable if required */ | |
1447 | while (supply_rdev != NULL) { | |
1448 | rdev = supply_rdev; | |
1449 | ||
1450 | mutex_lock(&rdev->mutex); | |
1451 | _regulator_disable(rdev, &supply_rdev); | |
1452 | mutex_unlock(&rdev->mutex); | |
1453 | } | |
1454 | ||
414c70cb LG |
1455 | return ret; |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1458 | ||
1459 | /* locks held by regulator_force_disable() */ | |
8cbf811d JC |
1460 | static int _regulator_force_disable(struct regulator_dev *rdev, |
1461 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1462 | { |
1463 | int ret = 0; | |
1464 | ||
1465 | /* force disable */ | |
1466 | if (rdev->desc->ops->disable) { | |
1467 | /* ah well, who wants to live forever... */ | |
1468 | ret = rdev->desc->ops->disable(rdev); | |
1469 | if (ret < 0) { | |
5da84fd9 | 1470 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1471 | return ret; |
1472 | } | |
1473 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1474 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1475 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1476 | } |
1477 | ||
1478 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1479 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1480 | |
1481 | rdev->use_count = 0; | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1485 | /** | |
1486 | * regulator_force_disable - force disable regulator output | |
1487 | * @regulator: regulator source | |
1488 | * | |
1489 | * Forcibly disable the regulator output voltage or current. | |
1490 | * NOTE: this *will* disable the regulator output even if other consumer | |
1491 | * devices have it enabled. This should be used for situations when device | |
1492 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1493 | */ | |
1494 | int regulator_force_disable(struct regulator *regulator) | |
1495 | { | |
8cbf811d | 1496 | struct regulator_dev *supply_rdev = NULL; |
414c70cb LG |
1497 | int ret; |
1498 | ||
1499 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb | 1500 | regulator->uA_load = 0; |
8cbf811d | 1501 | ret = _regulator_force_disable(regulator->rdev, &supply_rdev); |
414c70cb | 1502 | mutex_unlock(®ulator->rdev->mutex); |
8cbf811d JC |
1503 | |
1504 | if (supply_rdev) | |
1505 | regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); | |
1506 | ||
414c70cb LG |
1507 | return ret; |
1508 | } | |
1509 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1510 | ||
1511 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1512 | { | |
9a7f6a4c | 1513 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1514 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1515 | return 1; |
414c70cb | 1516 | |
9332546f | 1517 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1518 | } |
1519 | ||
1520 | /** | |
1521 | * regulator_is_enabled - is the regulator output enabled | |
1522 | * @regulator: regulator source | |
1523 | * | |
412aec61 DB |
1524 | * Returns positive if the regulator driver backing the source/client |
1525 | * has requested that the device be enabled, zero if it hasn't, else a | |
1526 | * negative errno code. | |
1527 | * | |
1528 | * Note that the device backing this regulator handle can have multiple | |
1529 | * users, so it might be enabled even if regulator_enable() was never | |
1530 | * called for this particular source. | |
414c70cb LG |
1531 | */ |
1532 | int regulator_is_enabled(struct regulator *regulator) | |
1533 | { | |
9332546f MB |
1534 | int ret; |
1535 | ||
1536 | mutex_lock(®ulator->rdev->mutex); | |
1537 | ret = _regulator_is_enabled(regulator->rdev); | |
1538 | mutex_unlock(®ulator->rdev->mutex); | |
1539 | ||
1540 | return ret; | |
414c70cb LG |
1541 | } |
1542 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1543 | ||
4367cfdc DB |
1544 | /** |
1545 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1546 | * @regulator: regulator source | |
1547 | * | |
1548 | * Returns number of selectors, or negative errno. Selectors are | |
1549 | * numbered starting at zero, and typically correspond to bitfields | |
1550 | * in hardware registers. | |
1551 | */ | |
1552 | int regulator_count_voltages(struct regulator *regulator) | |
1553 | { | |
1554 | struct regulator_dev *rdev = regulator->rdev; | |
1555 | ||
1556 | return rdev->desc->n_voltages ? : -EINVAL; | |
1557 | } | |
1558 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1559 | ||
1560 | /** | |
1561 | * regulator_list_voltage - enumerate supported voltages | |
1562 | * @regulator: regulator source | |
1563 | * @selector: identify voltage to list | |
1564 | * Context: can sleep | |
1565 | * | |
1566 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1567 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1568 | * negative errno. |
1569 | */ | |
1570 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1571 | { | |
1572 | struct regulator_dev *rdev = regulator->rdev; | |
1573 | struct regulator_ops *ops = rdev->desc->ops; | |
1574 | int ret; | |
1575 | ||
1576 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1577 | return -EINVAL; | |
1578 | ||
1579 | mutex_lock(&rdev->mutex); | |
1580 | ret = ops->list_voltage(rdev, selector); | |
1581 | mutex_unlock(&rdev->mutex); | |
1582 | ||
1583 | if (ret > 0) { | |
1584 | if (ret < rdev->constraints->min_uV) | |
1585 | ret = 0; | |
1586 | else if (ret > rdev->constraints->max_uV) | |
1587 | ret = 0; | |
1588 | } | |
1589 | ||
1590 | return ret; | |
1591 | } | |
1592 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1593 | ||
a7a1ad90 MB |
1594 | /** |
1595 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1596 | * | |
1597 | * @regulator: Regulator to check. | |
1598 | * @min_uV: Minimum required voltage in uV. | |
1599 | * @max_uV: Maximum required voltage in uV. | |
1600 | * | |
1601 | * Returns a boolean or a negative error code. | |
1602 | */ | |
1603 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1604 | int min_uV, int max_uV) | |
1605 | { | |
1606 | int i, voltages, ret; | |
1607 | ||
1608 | ret = regulator_count_voltages(regulator); | |
1609 | if (ret < 0) | |
1610 | return ret; | |
1611 | voltages = ret; | |
1612 | ||
1613 | for (i = 0; i < voltages; i++) { | |
1614 | ret = regulator_list_voltage(regulator, i); | |
1615 | ||
1616 | if (ret >= min_uV && ret <= max_uV) | |
1617 | return 1; | |
1618 | } | |
1619 | ||
1620 | return 0; | |
1621 | } | |
1622 | ||
75790251 MB |
1623 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
1624 | int min_uV, int max_uV) | |
1625 | { | |
1626 | int ret; | |
1627 | unsigned int selector; | |
1628 | ||
1629 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
1630 | ||
1631 | if (rdev->desc->ops->set_voltage) { | |
1632 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
1633 | &selector); | |
1634 | ||
1635 | if (rdev->desc->ops->list_voltage) | |
1636 | selector = rdev->desc->ops->list_voltage(rdev, | |
1637 | selector); | |
1638 | else | |
1639 | selector = -1; | |
e8eef82b MB |
1640 | } else if (rdev->desc->ops->set_voltage_sel) { |
1641 | int best_val = INT_MAX; | |
1642 | int i; | |
1643 | ||
1644 | selector = 0; | |
1645 | ||
1646 | /* Find the smallest voltage that falls within the specified | |
1647 | * range. | |
1648 | */ | |
1649 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1650 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
1651 | if (ret < 0) | |
1652 | continue; | |
1653 | ||
1654 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
1655 | best_val = ret; | |
1656 | selector = i; | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | if (best_val != INT_MAX) { | |
1661 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
1662 | selector = best_val; | |
1663 | } else { | |
1664 | ret = -EINVAL; | |
1665 | } | |
75790251 MB |
1666 | } else { |
1667 | ret = -EINVAL; | |
1668 | } | |
1669 | ||
ded06a52 MB |
1670 | if (ret == 0) |
1671 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
1672 | NULL); | |
1673 | ||
75790251 MB |
1674 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1675 | ||
1676 | return ret; | |
1677 | } | |
1678 | ||
414c70cb LG |
1679 | /** |
1680 | * regulator_set_voltage - set regulator output voltage | |
1681 | * @regulator: regulator source | |
1682 | * @min_uV: Minimum required voltage in uV | |
1683 | * @max_uV: Maximum acceptable voltage in uV | |
1684 | * | |
1685 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1686 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1687 | * | |
1688 | * If the regulator is enabled then the voltage will change to the new value | |
1689 | * immediately otherwise if the regulator is disabled the regulator will | |
1690 | * output at the new voltage when enabled. | |
1691 | * | |
1692 | * NOTE: If the regulator is shared between several devices then the lowest | |
1693 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1694 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1695 | * calling this function otherwise this call will fail. |
1696 | */ | |
1697 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1698 | { | |
1699 | struct regulator_dev *rdev = regulator->rdev; | |
1700 | int ret; | |
1701 | ||
1702 | mutex_lock(&rdev->mutex); | |
1703 | ||
1704 | /* sanity check */ | |
e8eef82b MB |
1705 | if (!rdev->desc->ops->set_voltage && |
1706 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
1707 | ret = -EINVAL; |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | /* constraints check */ | |
1712 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1713 | if (ret < 0) | |
1714 | goto out; | |
1715 | regulator->min_uV = min_uV; | |
1716 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1717 | |
05fda3b1 TP |
1718 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1719 | if (ret < 0) | |
1720 | goto out; | |
1721 | ||
75790251 | 1722 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 1723 | |
414c70cb LG |
1724 | out: |
1725 | mutex_unlock(&rdev->mutex); | |
1726 | return ret; | |
1727 | } | |
1728 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1729 | ||
606a2562 MB |
1730 | /** |
1731 | * regulator_sync_voltage - re-apply last regulator output voltage | |
1732 | * @regulator: regulator source | |
1733 | * | |
1734 | * Re-apply the last configured voltage. This is intended to be used | |
1735 | * where some external control source the consumer is cooperating with | |
1736 | * has caused the configured voltage to change. | |
1737 | */ | |
1738 | int regulator_sync_voltage(struct regulator *regulator) | |
1739 | { | |
1740 | struct regulator_dev *rdev = regulator->rdev; | |
1741 | int ret, min_uV, max_uV; | |
1742 | ||
1743 | mutex_lock(&rdev->mutex); | |
1744 | ||
1745 | if (!rdev->desc->ops->set_voltage && | |
1746 | !rdev->desc->ops->set_voltage_sel) { | |
1747 | ret = -EINVAL; | |
1748 | goto out; | |
1749 | } | |
1750 | ||
1751 | /* This is only going to work if we've had a voltage configured. */ | |
1752 | if (!regulator->min_uV && !regulator->max_uV) { | |
1753 | ret = -EINVAL; | |
1754 | goto out; | |
1755 | } | |
1756 | ||
1757 | min_uV = regulator->min_uV; | |
1758 | max_uV = regulator->max_uV; | |
1759 | ||
1760 | /* This should be a paranoia check... */ | |
1761 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1762 | if (ret < 0) | |
1763 | goto out; | |
1764 | ||
1765 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
1766 | if (ret < 0) | |
1767 | goto out; | |
1768 | ||
1769 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
1770 | ||
1771 | out: | |
1772 | mutex_unlock(&rdev->mutex); | |
1773 | return ret; | |
1774 | } | |
1775 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
1776 | ||
414c70cb LG |
1777 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
1778 | { | |
476c2d83 MB |
1779 | int sel; |
1780 | ||
1781 | if (rdev->desc->ops->get_voltage_sel) { | |
1782 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
1783 | if (sel < 0) | |
1784 | return sel; | |
1785 | return rdev->desc->ops->list_voltage(rdev, sel); | |
1786 | } | |
414c70cb LG |
1787 | if (rdev->desc->ops->get_voltage) |
1788 | return rdev->desc->ops->get_voltage(rdev); | |
1789 | else | |
1790 | return -EINVAL; | |
1791 | } | |
1792 | ||
1793 | /** | |
1794 | * regulator_get_voltage - get regulator output voltage | |
1795 | * @regulator: regulator source | |
1796 | * | |
1797 | * This returns the current regulator voltage in uV. | |
1798 | * | |
1799 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1800 | * function should not be used to determine regulator state. | |
1801 | */ | |
1802 | int regulator_get_voltage(struct regulator *regulator) | |
1803 | { | |
1804 | int ret; | |
1805 | ||
1806 | mutex_lock(®ulator->rdev->mutex); | |
1807 | ||
1808 | ret = _regulator_get_voltage(regulator->rdev); | |
1809 | ||
1810 | mutex_unlock(®ulator->rdev->mutex); | |
1811 | ||
1812 | return ret; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1815 | ||
1816 | /** | |
1817 | * regulator_set_current_limit - set regulator output current limit | |
1818 | * @regulator: regulator source | |
1819 | * @min_uA: Minimuum supported current in uA | |
1820 | * @max_uA: Maximum supported current in uA | |
1821 | * | |
1822 | * Sets current sink to the desired output current. This can be set during | |
1823 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1824 | * | |
1825 | * If the regulator is enabled then the current will change to the new value | |
1826 | * immediately otherwise if the regulator is disabled the regulator will | |
1827 | * output at the new current when enabled. | |
1828 | * | |
1829 | * NOTE: Regulator system constraints must be set for this regulator before | |
1830 | * calling this function otherwise this call will fail. | |
1831 | */ | |
1832 | int regulator_set_current_limit(struct regulator *regulator, | |
1833 | int min_uA, int max_uA) | |
1834 | { | |
1835 | struct regulator_dev *rdev = regulator->rdev; | |
1836 | int ret; | |
1837 | ||
1838 | mutex_lock(&rdev->mutex); | |
1839 | ||
1840 | /* sanity check */ | |
1841 | if (!rdev->desc->ops->set_current_limit) { | |
1842 | ret = -EINVAL; | |
1843 | goto out; | |
1844 | } | |
1845 | ||
1846 | /* constraints check */ | |
1847 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1848 | if (ret < 0) | |
1849 | goto out; | |
1850 | ||
1851 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1852 | out: | |
1853 | mutex_unlock(&rdev->mutex); | |
1854 | return ret; | |
1855 | } | |
1856 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1857 | ||
1858 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1859 | { | |
1860 | int ret; | |
1861 | ||
1862 | mutex_lock(&rdev->mutex); | |
1863 | ||
1864 | /* sanity check */ | |
1865 | if (!rdev->desc->ops->get_current_limit) { | |
1866 | ret = -EINVAL; | |
1867 | goto out; | |
1868 | } | |
1869 | ||
1870 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1871 | out: | |
1872 | mutex_unlock(&rdev->mutex); | |
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | /** | |
1877 | * regulator_get_current_limit - get regulator output current | |
1878 | * @regulator: regulator source | |
1879 | * | |
1880 | * This returns the current supplied by the specified current sink in uA. | |
1881 | * | |
1882 | * NOTE: If the regulator is disabled it will return the current value. This | |
1883 | * function should not be used to determine regulator state. | |
1884 | */ | |
1885 | int regulator_get_current_limit(struct regulator *regulator) | |
1886 | { | |
1887 | return _regulator_get_current_limit(regulator->rdev); | |
1888 | } | |
1889 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1890 | ||
1891 | /** | |
1892 | * regulator_set_mode - set regulator operating mode | |
1893 | * @regulator: regulator source | |
1894 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1895 | * | |
1896 | * Set regulator operating mode to increase regulator efficiency or improve | |
1897 | * regulation performance. | |
1898 | * | |
1899 | * NOTE: Regulator system constraints must be set for this regulator before | |
1900 | * calling this function otherwise this call will fail. | |
1901 | */ | |
1902 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1903 | { | |
1904 | struct regulator_dev *rdev = regulator->rdev; | |
1905 | int ret; | |
500b4ac9 | 1906 | int regulator_curr_mode; |
414c70cb LG |
1907 | |
1908 | mutex_lock(&rdev->mutex); | |
1909 | ||
1910 | /* sanity check */ | |
1911 | if (!rdev->desc->ops->set_mode) { | |
1912 | ret = -EINVAL; | |
1913 | goto out; | |
1914 | } | |
1915 | ||
500b4ac9 SI |
1916 | /* return if the same mode is requested */ |
1917 | if (rdev->desc->ops->get_mode) { | |
1918 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
1919 | if (regulator_curr_mode == mode) { | |
1920 | ret = 0; | |
1921 | goto out; | |
1922 | } | |
1923 | } | |
1924 | ||
414c70cb LG |
1925 | /* constraints check */ |
1926 | ret = regulator_check_mode(rdev, mode); | |
1927 | if (ret < 0) | |
1928 | goto out; | |
1929 | ||
1930 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1931 | out: | |
1932 | mutex_unlock(&rdev->mutex); | |
1933 | return ret; | |
1934 | } | |
1935 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1936 | ||
1937 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1938 | { | |
1939 | int ret; | |
1940 | ||
1941 | mutex_lock(&rdev->mutex); | |
1942 | ||
1943 | /* sanity check */ | |
1944 | if (!rdev->desc->ops->get_mode) { | |
1945 | ret = -EINVAL; | |
1946 | goto out; | |
1947 | } | |
1948 | ||
1949 | ret = rdev->desc->ops->get_mode(rdev); | |
1950 | out: | |
1951 | mutex_unlock(&rdev->mutex); | |
1952 | return ret; | |
1953 | } | |
1954 | ||
1955 | /** | |
1956 | * regulator_get_mode - get regulator operating mode | |
1957 | * @regulator: regulator source | |
1958 | * | |
1959 | * Get the current regulator operating mode. | |
1960 | */ | |
1961 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1962 | { | |
1963 | return _regulator_get_mode(regulator->rdev); | |
1964 | } | |
1965 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1966 | ||
1967 | /** | |
1968 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1969 | * @regulator: regulator source | |
1970 | * @uA_load: load current | |
1971 | * | |
1972 | * Notifies the regulator core of a new device load. This is then used by | |
1973 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1974 | * operating mode for the new regulator loading. | |
1975 | * | |
1976 | * Consumer devices notify their supply regulator of the maximum power | |
1977 | * they will require (can be taken from device datasheet in the power | |
1978 | * consumption tables) when they change operational status and hence power | |
1979 | * state. Examples of operational state changes that can affect power | |
1980 | * consumption are :- | |
1981 | * | |
1982 | * o Device is opened / closed. | |
1983 | * o Device I/O is about to begin or has just finished. | |
1984 | * o Device is idling in between work. | |
1985 | * | |
1986 | * This information is also exported via sysfs to userspace. | |
1987 | * | |
1988 | * DRMS will sum the total requested load on the regulator and change | |
1989 | * to the most efficient operating mode if platform constraints allow. | |
1990 | * | |
1991 | * Returns the new regulator mode or error. | |
1992 | */ | |
1993 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1994 | { | |
1995 | struct regulator_dev *rdev = regulator->rdev; | |
1996 | struct regulator *consumer; | |
1997 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1998 | unsigned int mode; | |
1999 | ||
2000 | mutex_lock(&rdev->mutex); | |
2001 | ||
2002 | regulator->uA_load = uA_load; | |
2003 | ret = regulator_check_drms(rdev); | |
2004 | if (ret < 0) | |
2005 | goto out; | |
2006 | ret = -EINVAL; | |
2007 | ||
2008 | /* sanity check */ | |
2009 | if (!rdev->desc->ops->get_optimum_mode) | |
2010 | goto out; | |
2011 | ||
2012 | /* get output voltage */ | |
1bf5a1f8 | 2013 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2014 | if (output_uV <= 0) { |
5da84fd9 | 2015 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2016 | goto out; |
2017 | } | |
2018 | ||
2019 | /* get input voltage */ | |
1bf5a1f8 MB |
2020 | input_uV = 0; |
2021 | if (rdev->supply) | |
2022 | input_uV = _regulator_get_voltage(rdev->supply); | |
2023 | if (input_uV <= 0) | |
414c70cb LG |
2024 | input_uV = rdev->constraints->input_uV; |
2025 | if (input_uV <= 0) { | |
5da84fd9 | 2026 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2027 | goto out; |
2028 | } | |
2029 | ||
2030 | /* calc total requested load for this regulator */ | |
2031 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2032 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2033 | |
2034 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2035 | input_uV, output_uV, | |
2036 | total_uA_load); | |
e573520b DB |
2037 | ret = regulator_check_mode(rdev, mode); |
2038 | if (ret < 0) { | |
5da84fd9 JP |
2039 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2040 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2041 | goto out; |
2042 | } | |
2043 | ||
2044 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2045 | if (ret < 0) { |
5da84fd9 | 2046 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2047 | goto out; |
2048 | } | |
2049 | ret = mode; | |
2050 | out: | |
2051 | mutex_unlock(&rdev->mutex); | |
2052 | return ret; | |
2053 | } | |
2054 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2055 | ||
2056 | /** | |
2057 | * regulator_register_notifier - register regulator event notifier | |
2058 | * @regulator: regulator source | |
69279fb9 | 2059 | * @nb: notifier block |
414c70cb LG |
2060 | * |
2061 | * Register notifier block to receive regulator events. | |
2062 | */ | |
2063 | int regulator_register_notifier(struct regulator *regulator, | |
2064 | struct notifier_block *nb) | |
2065 | { | |
2066 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2067 | nb); | |
2068 | } | |
2069 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2070 | ||
2071 | /** | |
2072 | * regulator_unregister_notifier - unregister regulator event notifier | |
2073 | * @regulator: regulator source | |
69279fb9 | 2074 | * @nb: notifier block |
414c70cb LG |
2075 | * |
2076 | * Unregister regulator event notifier block. | |
2077 | */ | |
2078 | int regulator_unregister_notifier(struct regulator *regulator, | |
2079 | struct notifier_block *nb) | |
2080 | { | |
2081 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2082 | nb); | |
2083 | } | |
2084 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2085 | ||
b136fb44 JC |
2086 | /* notify regulator consumers and downstream regulator consumers. |
2087 | * Note mutex must be held by caller. | |
2088 | */ | |
414c70cb LG |
2089 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2090 | unsigned long event, void *data) | |
2091 | { | |
2092 | struct regulator_dev *_rdev; | |
2093 | ||
2094 | /* call rdev chain first */ | |
414c70cb | 2095 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2096 | |
2097 | /* now notify regulator we supply */ | |
b136fb44 | 2098 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
2099 | mutex_lock(&_rdev->mutex); |
2100 | _notifier_call_chain(_rdev, event, data); | |
2101 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 2102 | } |
414c70cb LG |
2103 | } |
2104 | ||
2105 | /** | |
2106 | * regulator_bulk_get - get multiple regulator consumers | |
2107 | * | |
2108 | * @dev: Device to supply | |
2109 | * @num_consumers: Number of consumers to register | |
2110 | * @consumers: Configuration of consumers; clients are stored here. | |
2111 | * | |
2112 | * @return 0 on success, an errno on failure. | |
2113 | * | |
2114 | * This helper function allows drivers to get several regulator | |
2115 | * consumers in one operation. If any of the regulators cannot be | |
2116 | * acquired then any regulators that were allocated will be freed | |
2117 | * before returning to the caller. | |
2118 | */ | |
2119 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2120 | struct regulator_bulk_data *consumers) | |
2121 | { | |
2122 | int i; | |
2123 | int ret; | |
2124 | ||
2125 | for (i = 0; i < num_consumers; i++) | |
2126 | consumers[i].consumer = NULL; | |
2127 | ||
2128 | for (i = 0; i < num_consumers; i++) { | |
2129 | consumers[i].consumer = regulator_get(dev, | |
2130 | consumers[i].supply); | |
2131 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2132 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2133 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2134 | consumers[i].supply, ret); | |
414c70cb LG |
2135 | consumers[i].consumer = NULL; |
2136 | goto err; | |
2137 | } | |
2138 | } | |
2139 | ||
2140 | return 0; | |
2141 | ||
2142 | err: | |
2143 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2144 | regulator_put(consumers[i].consumer); | |
2145 | ||
2146 | return ret; | |
2147 | } | |
2148 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2149 | ||
2150 | /** | |
2151 | * regulator_bulk_enable - enable multiple regulator consumers | |
2152 | * | |
2153 | * @num_consumers: Number of consumers | |
2154 | * @consumers: Consumer data; clients are stored here. | |
2155 | * @return 0 on success, an errno on failure | |
2156 | * | |
2157 | * This convenience API allows consumers to enable multiple regulator | |
2158 | * clients in a single API call. If any consumers cannot be enabled | |
2159 | * then any others that were enabled will be disabled again prior to | |
2160 | * return. | |
2161 | */ | |
2162 | int regulator_bulk_enable(int num_consumers, | |
2163 | struct regulator_bulk_data *consumers) | |
2164 | { | |
2165 | int i; | |
2166 | int ret; | |
2167 | ||
2168 | for (i = 0; i < num_consumers; i++) { | |
2169 | ret = regulator_enable(consumers[i].consumer); | |
2170 | if (ret != 0) | |
2171 | goto err; | |
2172 | } | |
2173 | ||
2174 | return 0; | |
2175 | ||
2176 | err: | |
5da84fd9 | 2177 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2178 | for (--i; i >= 0; --i) |
414c70cb LG |
2179 | regulator_disable(consumers[i].consumer); |
2180 | ||
2181 | return ret; | |
2182 | } | |
2183 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2184 | ||
2185 | /** | |
2186 | * regulator_bulk_disable - disable multiple regulator consumers | |
2187 | * | |
2188 | * @num_consumers: Number of consumers | |
2189 | * @consumers: Consumer data; clients are stored here. | |
2190 | * @return 0 on success, an errno on failure | |
2191 | * | |
2192 | * This convenience API allows consumers to disable multiple regulator | |
2193 | * clients in a single API call. If any consumers cannot be enabled | |
2194 | * then any others that were disabled will be disabled again prior to | |
2195 | * return. | |
2196 | */ | |
2197 | int regulator_bulk_disable(int num_consumers, | |
2198 | struct regulator_bulk_data *consumers) | |
2199 | { | |
2200 | int i; | |
2201 | int ret; | |
2202 | ||
2203 | for (i = 0; i < num_consumers; i++) { | |
2204 | ret = regulator_disable(consumers[i].consumer); | |
2205 | if (ret != 0) | |
2206 | goto err; | |
2207 | } | |
2208 | ||
2209 | return 0; | |
2210 | ||
2211 | err: | |
5da84fd9 | 2212 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2213 | for (--i; i >= 0; --i) |
414c70cb LG |
2214 | regulator_enable(consumers[i].consumer); |
2215 | ||
2216 | return ret; | |
2217 | } | |
2218 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2219 | ||
2220 | /** | |
2221 | * regulator_bulk_free - free multiple regulator consumers | |
2222 | * | |
2223 | * @num_consumers: Number of consumers | |
2224 | * @consumers: Consumer data; clients are stored here. | |
2225 | * | |
2226 | * This convenience API allows consumers to free multiple regulator | |
2227 | * clients in a single API call. | |
2228 | */ | |
2229 | void regulator_bulk_free(int num_consumers, | |
2230 | struct regulator_bulk_data *consumers) | |
2231 | { | |
2232 | int i; | |
2233 | ||
2234 | for (i = 0; i < num_consumers; i++) { | |
2235 | regulator_put(consumers[i].consumer); | |
2236 | consumers[i].consumer = NULL; | |
2237 | } | |
2238 | } | |
2239 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2240 | ||
2241 | /** | |
2242 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2243 | * @rdev: regulator source |
414c70cb | 2244 | * @event: notifier block |
69279fb9 | 2245 | * @data: callback-specific data. |
414c70cb LG |
2246 | * |
2247 | * Called by regulator drivers to notify clients a regulator event has | |
2248 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2249 | * Note lock must be held by caller. |
414c70cb LG |
2250 | */ |
2251 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2252 | unsigned long event, void *data) | |
2253 | { | |
2254 | _notifier_call_chain(rdev, event, data); | |
2255 | return NOTIFY_DONE; | |
2256 | ||
2257 | } | |
2258 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2259 | ||
be721979 MB |
2260 | /** |
2261 | * regulator_mode_to_status - convert a regulator mode into a status | |
2262 | * | |
2263 | * @mode: Mode to convert | |
2264 | * | |
2265 | * Convert a regulator mode into a status. | |
2266 | */ | |
2267 | int regulator_mode_to_status(unsigned int mode) | |
2268 | { | |
2269 | switch (mode) { | |
2270 | case REGULATOR_MODE_FAST: | |
2271 | return REGULATOR_STATUS_FAST; | |
2272 | case REGULATOR_MODE_NORMAL: | |
2273 | return REGULATOR_STATUS_NORMAL; | |
2274 | case REGULATOR_MODE_IDLE: | |
2275 | return REGULATOR_STATUS_IDLE; | |
2276 | case REGULATOR_STATUS_STANDBY: | |
2277 | return REGULATOR_STATUS_STANDBY; | |
2278 | default: | |
2279 | return 0; | |
2280 | } | |
2281 | } | |
2282 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2283 | ||
7ad68e2f DB |
2284 | /* |
2285 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2286 | * create attributes that can be meaningfully displayed. | |
2287 | */ | |
2288 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2289 | { | |
2290 | struct device *dev = &rdev->dev; | |
2291 | struct regulator_ops *ops = rdev->desc->ops; | |
2292 | int status = 0; | |
2293 | ||
2294 | /* some attributes need specific methods to be displayed */ | |
476c2d83 | 2295 | if (ops->get_voltage || ops->get_voltage_sel) { |
7ad68e2f DB |
2296 | status = device_create_file(dev, &dev_attr_microvolts); |
2297 | if (status < 0) | |
2298 | return status; | |
2299 | } | |
2300 | if (ops->get_current_limit) { | |
2301 | status = device_create_file(dev, &dev_attr_microamps); | |
2302 | if (status < 0) | |
2303 | return status; | |
2304 | } | |
2305 | if (ops->get_mode) { | |
2306 | status = device_create_file(dev, &dev_attr_opmode); | |
2307 | if (status < 0) | |
2308 | return status; | |
2309 | } | |
2310 | if (ops->is_enabled) { | |
2311 | status = device_create_file(dev, &dev_attr_state); | |
2312 | if (status < 0) | |
2313 | return status; | |
2314 | } | |
853116a1 DB |
2315 | if (ops->get_status) { |
2316 | status = device_create_file(dev, &dev_attr_status); | |
2317 | if (status < 0) | |
2318 | return status; | |
2319 | } | |
7ad68e2f DB |
2320 | |
2321 | /* some attributes are type-specific */ | |
2322 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2323 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2324 | if (status < 0) | |
2325 | return status; | |
2326 | } | |
2327 | ||
2328 | /* all the other attributes exist to support constraints; | |
2329 | * don't show them if there are no constraints, or if the | |
2330 | * relevant supporting methods are missing. | |
2331 | */ | |
2332 | if (!rdev->constraints) | |
2333 | return status; | |
2334 | ||
2335 | /* constraints need specific supporting methods */ | |
e8eef82b | 2336 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2337 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2338 | if (status < 0) | |
2339 | return status; | |
2340 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2341 | if (status < 0) | |
2342 | return status; | |
2343 | } | |
2344 | if (ops->set_current_limit) { | |
2345 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2346 | if (status < 0) | |
2347 | return status; | |
2348 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2349 | if (status < 0) | |
2350 | return status; | |
2351 | } | |
2352 | ||
2353 | /* suspend mode constraints need multiple supporting methods */ | |
2354 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2355 | return status; | |
2356 | ||
2357 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2358 | if (status < 0) | |
2359 | return status; | |
2360 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2361 | if (status < 0) | |
2362 | return status; | |
2363 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2364 | if (status < 0) | |
2365 | return status; | |
2366 | ||
2367 | if (ops->set_suspend_voltage) { | |
2368 | status = device_create_file(dev, | |
2369 | &dev_attr_suspend_standby_microvolts); | |
2370 | if (status < 0) | |
2371 | return status; | |
2372 | status = device_create_file(dev, | |
2373 | &dev_attr_suspend_mem_microvolts); | |
2374 | if (status < 0) | |
2375 | return status; | |
2376 | status = device_create_file(dev, | |
2377 | &dev_attr_suspend_disk_microvolts); | |
2378 | if (status < 0) | |
2379 | return status; | |
2380 | } | |
2381 | ||
2382 | if (ops->set_suspend_mode) { | |
2383 | status = device_create_file(dev, | |
2384 | &dev_attr_suspend_standby_mode); | |
2385 | if (status < 0) | |
2386 | return status; | |
2387 | status = device_create_file(dev, | |
2388 | &dev_attr_suspend_mem_mode); | |
2389 | if (status < 0) | |
2390 | return status; | |
2391 | status = device_create_file(dev, | |
2392 | &dev_attr_suspend_disk_mode); | |
2393 | if (status < 0) | |
2394 | return status; | |
2395 | } | |
2396 | ||
2397 | return status; | |
2398 | } | |
2399 | ||
414c70cb LG |
2400 | /** |
2401 | * regulator_register - register regulator | |
69279fb9 MB |
2402 | * @regulator_desc: regulator to register |
2403 | * @dev: struct device for the regulator | |
0527100f | 2404 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2405 | * @driver_data: private regulator data |
414c70cb LG |
2406 | * |
2407 | * Called by regulator drivers to register a regulator. | |
2408 | * Returns 0 on success. | |
2409 | */ | |
2410 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2411 | struct device *dev, const struct regulator_init_data *init_data, |
0527100f | 2412 | void *driver_data) |
414c70cb LG |
2413 | { |
2414 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2415 | struct regulator_dev *rdev; | |
a5766f11 | 2416 | int ret, i; |
414c70cb LG |
2417 | |
2418 | if (regulator_desc == NULL) | |
2419 | return ERR_PTR(-EINVAL); | |
2420 | ||
2421 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2422 | return ERR_PTR(-EINVAL); | |
2423 | ||
cd78dfc6 DL |
2424 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2425 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2426 | return ERR_PTR(-EINVAL); |
2427 | ||
46fabe1e MB |
2428 | if (!init_data) |
2429 | return ERR_PTR(-EINVAL); | |
2430 | ||
476c2d83 MB |
2431 | /* Only one of each should be implemented */ |
2432 | WARN_ON(regulator_desc->ops->get_voltage && | |
2433 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
2434 | WARN_ON(regulator_desc->ops->set_voltage && |
2435 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
2436 | |
2437 | /* If we're using selectors we must implement list_voltage. */ | |
2438 | if (regulator_desc->ops->get_voltage_sel && | |
2439 | !regulator_desc->ops->list_voltage) { | |
2440 | return ERR_PTR(-EINVAL); | |
2441 | } | |
e8eef82b MB |
2442 | if (regulator_desc->ops->set_voltage_sel && |
2443 | !regulator_desc->ops->list_voltage) { | |
2444 | return ERR_PTR(-EINVAL); | |
2445 | } | |
476c2d83 | 2446 | |
414c70cb LG |
2447 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2448 | if (rdev == NULL) | |
2449 | return ERR_PTR(-ENOMEM); | |
2450 | ||
2451 | mutex_lock(®ulator_list_mutex); | |
2452 | ||
2453 | mutex_init(&rdev->mutex); | |
a5766f11 | 2454 | rdev->reg_data = driver_data; |
414c70cb LG |
2455 | rdev->owner = regulator_desc->owner; |
2456 | rdev->desc = regulator_desc; | |
2457 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2458 | INIT_LIST_HEAD(&rdev->supply_list); | |
2459 | INIT_LIST_HEAD(&rdev->list); | |
2460 | INIT_LIST_HEAD(&rdev->slist); | |
2461 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2462 | ||
a5766f11 LG |
2463 | /* preform any regulator specific init */ |
2464 | if (init_data->regulator_init) { | |
2465 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2466 | if (ret < 0) |
2467 | goto clean; | |
a5766f11 LG |
2468 | } |
2469 | ||
a5766f11 | 2470 | /* register with sysfs */ |
414c70cb | 2471 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2472 | rdev->dev.parent = dev; |
812460a9 KS |
2473 | dev_set_name(&rdev->dev, "regulator.%d", |
2474 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2475 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2476 | if (ret != 0) { |
2477 | put_device(&rdev->dev); | |
4fca9545 | 2478 | goto clean; |
ad7725cb | 2479 | } |
a5766f11 LG |
2480 | |
2481 | dev_set_drvdata(&rdev->dev, rdev); | |
2482 | ||
74f544c1 MR |
2483 | /* set regulator constraints */ |
2484 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2485 | if (ret < 0) | |
2486 | goto scrub; | |
2487 | ||
7ad68e2f DB |
2488 | /* add attributes supported by this regulator */ |
2489 | ret = add_regulator_attributes(rdev); | |
2490 | if (ret < 0) | |
2491 | goto scrub; | |
2492 | ||
a5766f11 | 2493 | /* set supply regulator if it exists */ |
0178f3e2 MB |
2494 | if (init_data->supply_regulator && init_data->supply_regulator_dev) { |
2495 | dev_err(dev, | |
2496 | "Supply regulator specified by both name and dev\n"); | |
7727da22 | 2497 | ret = -EINVAL; |
0178f3e2 MB |
2498 | goto scrub; |
2499 | } | |
2500 | ||
2501 | if (init_data->supply_regulator) { | |
2502 | struct regulator_dev *r; | |
2503 | int found = 0; | |
2504 | ||
2505 | list_for_each_entry(r, ®ulator_list, list) { | |
2506 | if (strcmp(rdev_get_name(r), | |
2507 | init_data->supply_regulator) == 0) { | |
2508 | found = 1; | |
2509 | break; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | if (!found) { | |
2514 | dev_err(dev, "Failed to find supply %s\n", | |
2515 | init_data->supply_regulator); | |
7727da22 | 2516 | ret = -ENODEV; |
0178f3e2 MB |
2517 | goto scrub; |
2518 | } | |
2519 | ||
2520 | ret = set_supply(rdev, r); | |
2521 | if (ret < 0) | |
2522 | goto scrub; | |
2523 | } | |
2524 | ||
a5766f11 | 2525 | if (init_data->supply_regulator_dev) { |
0178f3e2 | 2526 | dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); |
a5766f11 LG |
2527 | ret = set_supply(rdev, |
2528 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2529 | if (ret < 0) |
2530 | goto scrub; | |
a5766f11 LG |
2531 | } |
2532 | ||
2533 | /* add consumers devices */ | |
2534 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2535 | ret = set_consumer_device_supply(rdev, | |
2536 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2537 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2538 | init_data->consumer_supplies[i].supply); |
d4033b54 JN |
2539 | if (ret < 0) |
2540 | goto unset_supplies; | |
414c70cb | 2541 | } |
a5766f11 LG |
2542 | |
2543 | list_add(&rdev->list, ®ulator_list); | |
2544 | out: | |
414c70cb LG |
2545 | mutex_unlock(®ulator_list_mutex); |
2546 | return rdev; | |
4fca9545 | 2547 | |
d4033b54 JN |
2548 | unset_supplies: |
2549 | unset_regulator_supplies(rdev); | |
2550 | ||
4fca9545 DB |
2551 | scrub: |
2552 | device_unregister(&rdev->dev); | |
53032daf PW |
2553 | /* device core frees rdev */ |
2554 | rdev = ERR_PTR(ret); | |
2555 | goto out; | |
2556 | ||
4fca9545 DB |
2557 | clean: |
2558 | kfree(rdev); | |
2559 | rdev = ERR_PTR(ret); | |
2560 | goto out; | |
414c70cb LG |
2561 | } |
2562 | EXPORT_SYMBOL_GPL(regulator_register); | |
2563 | ||
2564 | /** | |
2565 | * regulator_unregister - unregister regulator | |
69279fb9 | 2566 | * @rdev: regulator to unregister |
414c70cb LG |
2567 | * |
2568 | * Called by regulator drivers to unregister a regulator. | |
2569 | */ | |
2570 | void regulator_unregister(struct regulator_dev *rdev) | |
2571 | { | |
2572 | if (rdev == NULL) | |
2573 | return; | |
2574 | ||
2575 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2576 | WARN_ON(rdev->open_count); |
0f1d747b | 2577 | unset_regulator_supplies(rdev); |
414c70cb LG |
2578 | list_del(&rdev->list); |
2579 | if (rdev->supply) | |
2580 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2581 | device_unregister(&rdev->dev); | |
f8c12fe3 | 2582 | kfree(rdev->constraints); |
414c70cb LG |
2583 | mutex_unlock(®ulator_list_mutex); |
2584 | } | |
2585 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2586 | ||
414c70cb | 2587 | /** |
cf7bbcdf | 2588 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2589 | * @state: system suspend state |
2590 | * | |
2591 | * Configure each regulator with it's suspend operating parameters for state. | |
2592 | * This will usually be called by machine suspend code prior to supending. | |
2593 | */ | |
2594 | int regulator_suspend_prepare(suspend_state_t state) | |
2595 | { | |
2596 | struct regulator_dev *rdev; | |
2597 | int ret = 0; | |
2598 | ||
2599 | /* ON is handled by regulator active state */ | |
2600 | if (state == PM_SUSPEND_ON) | |
2601 | return -EINVAL; | |
2602 | ||
2603 | mutex_lock(®ulator_list_mutex); | |
2604 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2605 | ||
2606 | mutex_lock(&rdev->mutex); | |
2607 | ret = suspend_prepare(rdev, state); | |
2608 | mutex_unlock(&rdev->mutex); | |
2609 | ||
2610 | if (ret < 0) { | |
5da84fd9 | 2611 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2612 | goto out; |
2613 | } | |
2614 | } | |
2615 | out: | |
2616 | mutex_unlock(®ulator_list_mutex); | |
2617 | return ret; | |
2618 | } | |
2619 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2620 | ||
ca725561 MB |
2621 | /** |
2622 | * regulator_has_full_constraints - the system has fully specified constraints | |
2623 | * | |
2624 | * Calling this function will cause the regulator API to disable all | |
2625 | * regulators which have a zero use count and don't have an always_on | |
2626 | * constraint in a late_initcall. | |
2627 | * | |
2628 | * The intention is that this will become the default behaviour in a | |
2629 | * future kernel release so users are encouraged to use this facility | |
2630 | * now. | |
2631 | */ | |
2632 | void regulator_has_full_constraints(void) | |
2633 | { | |
2634 | has_full_constraints = 1; | |
2635 | } | |
2636 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2637 | ||
688fe99a MB |
2638 | /** |
2639 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2640 | * | |
2641 | * Calling this function will cause the regulator API to provide a | |
2642 | * dummy regulator to consumers if no physical regulator is found, | |
2643 | * allowing most consumers to proceed as though a regulator were | |
2644 | * configured. This allows systems such as those with software | |
2645 | * controllable regulators for the CPU core only to be brought up more | |
2646 | * readily. | |
2647 | */ | |
2648 | void regulator_use_dummy_regulator(void) | |
2649 | { | |
2650 | board_wants_dummy_regulator = true; | |
2651 | } | |
2652 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2653 | ||
414c70cb LG |
2654 | /** |
2655 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2656 | * @rdev: regulator |
414c70cb LG |
2657 | * |
2658 | * Get rdev regulator driver private data. This call can be used in the | |
2659 | * regulator driver context. | |
2660 | */ | |
2661 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2662 | { | |
2663 | return rdev->reg_data; | |
2664 | } | |
2665 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2666 | ||
2667 | /** | |
2668 | * regulator_get_drvdata - get regulator driver data | |
2669 | * @regulator: regulator | |
2670 | * | |
2671 | * Get regulator driver private data. This call can be used in the consumer | |
2672 | * driver context when non API regulator specific functions need to be called. | |
2673 | */ | |
2674 | void *regulator_get_drvdata(struct regulator *regulator) | |
2675 | { | |
2676 | return regulator->rdev->reg_data; | |
2677 | } | |
2678 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2679 | ||
2680 | /** | |
2681 | * regulator_set_drvdata - set regulator driver data | |
2682 | * @regulator: regulator | |
2683 | * @data: data | |
2684 | */ | |
2685 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2686 | { | |
2687 | regulator->rdev->reg_data = data; | |
2688 | } | |
2689 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2690 | ||
2691 | /** | |
2692 | * regulator_get_id - get regulator ID | |
69279fb9 | 2693 | * @rdev: regulator |
414c70cb LG |
2694 | */ |
2695 | int rdev_get_id(struct regulator_dev *rdev) | |
2696 | { | |
2697 | return rdev->desc->id; | |
2698 | } | |
2699 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2700 | ||
a5766f11 LG |
2701 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2702 | { | |
2703 | return &rdev->dev; | |
2704 | } | |
2705 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2706 | ||
2707 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2708 | { | |
2709 | return reg_init_data->driver_data; | |
2710 | } | |
2711 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2712 | ||
414c70cb LG |
2713 | static int __init regulator_init(void) |
2714 | { | |
34abbd68 MB |
2715 | int ret; |
2716 | ||
34abbd68 MB |
2717 | ret = class_register(®ulator_class); |
2718 | ||
2719 | regulator_dummy_init(); | |
2720 | ||
2721 | return ret; | |
414c70cb LG |
2722 | } |
2723 | ||
2724 | /* init early to allow our consumers to complete system booting */ | |
2725 | core_initcall(regulator_init); | |
ca725561 MB |
2726 | |
2727 | static int __init regulator_init_complete(void) | |
2728 | { | |
2729 | struct regulator_dev *rdev; | |
2730 | struct regulator_ops *ops; | |
2731 | struct regulation_constraints *c; | |
2732 | int enabled, ret; | |
ca725561 MB |
2733 | |
2734 | mutex_lock(®ulator_list_mutex); | |
2735 | ||
2736 | /* If we have a full configuration then disable any regulators | |
2737 | * which are not in use or always_on. This will become the | |
2738 | * default behaviour in the future. | |
2739 | */ | |
2740 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2741 | ops = rdev->desc->ops; | |
2742 | c = rdev->constraints; | |
2743 | ||
f25e0b4f | 2744 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2745 | continue; |
2746 | ||
2747 | mutex_lock(&rdev->mutex); | |
2748 | ||
2749 | if (rdev->use_count) | |
2750 | goto unlock; | |
2751 | ||
2752 | /* If we can't read the status assume it's on. */ | |
2753 | if (ops->is_enabled) | |
2754 | enabled = ops->is_enabled(rdev); | |
2755 | else | |
2756 | enabled = 1; | |
2757 | ||
2758 | if (!enabled) | |
2759 | goto unlock; | |
2760 | ||
2761 | if (has_full_constraints) { | |
2762 | /* We log since this may kill the system if it | |
2763 | * goes wrong. */ | |
5da84fd9 | 2764 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
2765 | ret = ops->disable(rdev); |
2766 | if (ret != 0) { | |
5da84fd9 | 2767 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
2768 | } |
2769 | } else { | |
2770 | /* The intention is that in future we will | |
2771 | * assume that full constraints are provided | |
2772 | * so warn even if we aren't going to do | |
2773 | * anything here. | |
2774 | */ | |
5da84fd9 | 2775 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
2776 | } |
2777 | ||
2778 | unlock: | |
2779 | mutex_unlock(&rdev->mutex); | |
2780 | } | |
2781 | ||
2782 | mutex_unlock(®ulator_list_mutex); | |
2783 | ||
2784 | return 0; | |
2785 | } | |
2786 | late_initcall(regulator_init_complete); |