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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/suspend.h> | |
21 | #include <linux/regulator/consumer.h> | |
22 | #include <linux/regulator/driver.h> | |
23 | #include <linux/regulator/machine.h> | |
24 | ||
25 | #define REGULATOR_VERSION "0.5" | |
26 | ||
27 | static DEFINE_MUTEX(regulator_list_mutex); | |
28 | static LIST_HEAD(regulator_list); | |
29 | static LIST_HEAD(regulator_map_list); | |
30 | ||
31 | /** | |
32 | * struct regulator_dev | |
33 | * | |
34 | * Voltage / Current regulator class device. One for each regulator. | |
35 | */ | |
36 | struct regulator_dev { | |
37 | struct regulator_desc *desc; | |
38 | int use_count; | |
39 | ||
40 | /* lists we belong to */ | |
41 | struct list_head list; /* list of all regulators */ | |
42 | struct list_head slist; /* list of supplied regulators */ | |
43 | ||
44 | /* lists we own */ | |
45 | struct list_head consumer_list; /* consumers we supply */ | |
46 | struct list_head supply_list; /* regulators we supply */ | |
47 | ||
48 | struct blocking_notifier_head notifier; | |
49 | struct mutex mutex; /* consumer lock */ | |
50 | struct module *owner; | |
51 | struct device dev; | |
52 | struct regulation_constraints *constraints; | |
53 | struct regulator_dev *supply; /* for tree */ | |
54 | ||
55 | void *reg_data; /* regulator_dev data */ | |
56 | }; | |
57 | ||
58 | /** | |
59 | * struct regulator_map | |
60 | * | |
61 | * Used to provide symbolic supply names to devices. | |
62 | */ | |
63 | struct regulator_map { | |
64 | struct list_head list; | |
65 | struct device *dev; | |
66 | const char *supply; | |
67 | const char *regulator; | |
68 | }; | |
69 | ||
70 | static inline struct regulator_dev *to_rdev(struct device *d) | |
71 | { | |
72 | return container_of(d, struct regulator_dev, dev); | |
73 | } | |
74 | ||
75 | /* | |
76 | * struct regulator | |
77 | * | |
78 | * One for each consumer device. | |
79 | */ | |
80 | struct regulator { | |
81 | struct device *dev; | |
82 | struct list_head list; | |
83 | int uA_load; | |
84 | int min_uV; | |
85 | int max_uV; | |
86 | int enabled; /* client has called enabled */ | |
87 | char *supply_name; | |
88 | struct device_attribute dev_attr; | |
89 | struct regulator_dev *rdev; | |
90 | }; | |
91 | ||
92 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
93 | static int _regulator_disable(struct regulator_dev *rdev); | |
94 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
95 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
96 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
97 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
98 | unsigned long event, void *data); | |
99 | ||
100 | /* gets the regulator for a given consumer device */ | |
101 | static struct regulator *get_device_regulator(struct device *dev) | |
102 | { | |
103 | struct regulator *regulator = NULL; | |
104 | struct regulator_dev *rdev; | |
105 | ||
106 | mutex_lock(®ulator_list_mutex); | |
107 | list_for_each_entry(rdev, ®ulator_list, list) { | |
108 | mutex_lock(&rdev->mutex); | |
109 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
110 | if (regulator->dev == dev) { | |
111 | mutex_unlock(&rdev->mutex); | |
112 | mutex_unlock(®ulator_list_mutex); | |
113 | return regulator; | |
114 | } | |
115 | } | |
116 | mutex_unlock(&rdev->mutex); | |
117 | } | |
118 | mutex_unlock(®ulator_list_mutex); | |
119 | return NULL; | |
120 | } | |
121 | ||
122 | /* Platform voltage constraint check */ | |
123 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
124 | int *min_uV, int *max_uV) | |
125 | { | |
126 | BUG_ON(*min_uV > *max_uV); | |
127 | ||
128 | if (!rdev->constraints) { | |
129 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
130 | rdev->desc->name); | |
131 | return -ENODEV; | |
132 | } | |
133 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
134 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
135 | __func__, rdev->desc->name); | |
136 | return -EPERM; | |
137 | } | |
138 | ||
139 | if (*max_uV > rdev->constraints->max_uV) | |
140 | *max_uV = rdev->constraints->max_uV; | |
141 | if (*min_uV < rdev->constraints->min_uV) | |
142 | *min_uV = rdev->constraints->min_uV; | |
143 | ||
144 | if (*min_uV > *max_uV) | |
145 | return -EINVAL; | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | /* current constraint check */ | |
151 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
152 | int *min_uA, int *max_uA) | |
153 | { | |
154 | BUG_ON(*min_uA > *max_uA); | |
155 | ||
156 | if (!rdev->constraints) { | |
157 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
158 | rdev->desc->name); | |
159 | return -ENODEV; | |
160 | } | |
161 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
162 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
163 | __func__, rdev->desc->name); | |
164 | return -EPERM; | |
165 | } | |
166 | ||
167 | if (*max_uA > rdev->constraints->max_uA) | |
168 | *max_uA = rdev->constraints->max_uA; | |
169 | if (*min_uA < rdev->constraints->min_uA) | |
170 | *min_uA = rdev->constraints->min_uA; | |
171 | ||
172 | if (*min_uA > *max_uA) | |
173 | return -EINVAL; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | /* operating mode constraint check */ | |
179 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
180 | { | |
181 | if (!rdev->constraints) { | |
182 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
183 | rdev->desc->name); | |
184 | return -ENODEV; | |
185 | } | |
186 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
187 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
188 | __func__, rdev->desc->name); | |
189 | return -EPERM; | |
190 | } | |
191 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
192 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
193 | __func__, mode, rdev->desc->name); | |
194 | return -EINVAL; | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* dynamic regulator mode switching constraint check */ | |
200 | static int regulator_check_drms(struct regulator_dev *rdev) | |
201 | { | |
202 | if (!rdev->constraints) { | |
203 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
204 | rdev->desc->name); | |
205 | return -ENODEV; | |
206 | } | |
207 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
208 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
209 | __func__, rdev->desc->name); | |
210 | return -EPERM; | |
211 | } | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static ssize_t device_requested_uA_show(struct device *dev, | |
216 | struct device_attribute *attr, char *buf) | |
217 | { | |
218 | struct regulator *regulator; | |
219 | ||
220 | regulator = get_device_regulator(dev); | |
221 | if (regulator == NULL) | |
222 | return 0; | |
223 | ||
224 | return sprintf(buf, "%d\n", regulator->uA_load); | |
225 | } | |
226 | ||
227 | static ssize_t regulator_uV_show(struct device *dev, | |
228 | struct device_attribute *attr, char *buf) | |
229 | { | |
230 | struct regulator_dev *rdev = to_rdev(dev); | |
231 | ssize_t ret; | |
232 | ||
233 | mutex_lock(&rdev->mutex); | |
234 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
235 | mutex_unlock(&rdev->mutex); | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
240 | static ssize_t regulator_uA_show(struct device *dev, | |
241 | struct device_attribute *attr, char *buf) | |
242 | { | |
243 | struct regulator_dev *rdev = to_rdev(dev); | |
244 | ||
245 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
246 | } | |
247 | ||
248 | static ssize_t regulator_opmode_show(struct device *dev, | |
249 | struct device_attribute *attr, char *buf) | |
250 | { | |
251 | struct regulator_dev *rdev = to_rdev(dev); | |
252 | int mode = _regulator_get_mode(rdev); | |
253 | ||
254 | switch (mode) { | |
255 | case REGULATOR_MODE_FAST: | |
256 | return sprintf(buf, "fast\n"); | |
257 | case REGULATOR_MODE_NORMAL: | |
258 | return sprintf(buf, "normal\n"); | |
259 | case REGULATOR_MODE_IDLE: | |
260 | return sprintf(buf, "idle\n"); | |
261 | case REGULATOR_MODE_STANDBY: | |
262 | return sprintf(buf, "standby\n"); | |
263 | } | |
264 | return sprintf(buf, "unknown\n"); | |
265 | } | |
266 | ||
267 | static ssize_t regulator_state_show(struct device *dev, | |
268 | struct device_attribute *attr, char *buf) | |
269 | { | |
270 | struct regulator_dev *rdev = to_rdev(dev); | |
271 | int state = _regulator_is_enabled(rdev); | |
272 | ||
273 | if (state > 0) | |
274 | return sprintf(buf, "enabled\n"); | |
275 | else if (state == 0) | |
276 | return sprintf(buf, "disabled\n"); | |
277 | else | |
278 | return sprintf(buf, "unknown\n"); | |
279 | } | |
280 | ||
281 | static ssize_t regulator_min_uA_show(struct device *dev, | |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct regulator_dev *rdev = to_rdev(dev); | |
285 | ||
286 | if (!rdev->constraints) | |
287 | return sprintf(buf, "constraint not defined\n"); | |
288 | ||
289 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
290 | } | |
291 | ||
292 | static ssize_t regulator_max_uA_show(struct device *dev, | |
293 | struct device_attribute *attr, char *buf) | |
294 | { | |
295 | struct regulator_dev *rdev = to_rdev(dev); | |
296 | ||
297 | if (!rdev->constraints) | |
298 | return sprintf(buf, "constraint not defined\n"); | |
299 | ||
300 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
301 | } | |
302 | ||
303 | static ssize_t regulator_min_uV_show(struct device *dev, | |
304 | struct device_attribute *attr, char *buf) | |
305 | { | |
306 | struct regulator_dev *rdev = to_rdev(dev); | |
307 | ||
308 | if (!rdev->constraints) | |
309 | return sprintf(buf, "constraint not defined\n"); | |
310 | ||
311 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
312 | } | |
313 | ||
314 | static ssize_t regulator_max_uV_show(struct device *dev, | |
315 | struct device_attribute *attr, char *buf) | |
316 | { | |
317 | struct regulator_dev *rdev = to_rdev(dev); | |
318 | ||
319 | if (!rdev->constraints) | |
320 | return sprintf(buf, "constraint not defined\n"); | |
321 | ||
322 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
323 | } | |
324 | ||
325 | static ssize_t regulator_total_uA_show(struct device *dev, | |
326 | struct device_attribute *attr, char *buf) | |
327 | { | |
328 | struct regulator_dev *rdev = to_rdev(dev); | |
329 | struct regulator *regulator; | |
330 | int uA = 0; | |
331 | ||
332 | mutex_lock(&rdev->mutex); | |
333 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
334 | uA += regulator->uA_load; | |
335 | mutex_unlock(&rdev->mutex); | |
336 | return sprintf(buf, "%d\n", uA); | |
337 | } | |
338 | ||
339 | static ssize_t regulator_num_users_show(struct device *dev, | |
340 | struct device_attribute *attr, char *buf) | |
341 | { | |
342 | struct regulator_dev *rdev = to_rdev(dev); | |
343 | return sprintf(buf, "%d\n", rdev->use_count); | |
344 | } | |
345 | ||
346 | static ssize_t regulator_type_show(struct device *dev, | |
347 | struct device_attribute *attr, char *buf) | |
348 | { | |
349 | struct regulator_dev *rdev = to_rdev(dev); | |
350 | ||
351 | switch (rdev->desc->type) { | |
352 | case REGULATOR_VOLTAGE: | |
353 | return sprintf(buf, "voltage\n"); | |
354 | case REGULATOR_CURRENT: | |
355 | return sprintf(buf, "current\n"); | |
356 | } | |
357 | return sprintf(buf, "unknown\n"); | |
358 | } | |
359 | ||
360 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
361 | struct device_attribute *attr, char *buf) | |
362 | { | |
363 | struct regulator_dev *rdev = to_rdev(dev); | |
364 | ||
365 | if (!rdev->constraints) | |
366 | return sprintf(buf, "not defined\n"); | |
367 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); | |
368 | } | |
369 | ||
370 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
371 | struct device_attribute *attr, char *buf) | |
372 | { | |
373 | struct regulator_dev *rdev = to_rdev(dev); | |
374 | ||
375 | if (!rdev->constraints) | |
376 | return sprintf(buf, "not defined\n"); | |
377 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); | |
378 | } | |
379 | ||
380 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
381 | struct device_attribute *attr, char *buf) | |
382 | { | |
383 | struct regulator_dev *rdev = to_rdev(dev); | |
384 | ||
385 | if (!rdev->constraints) | |
386 | return sprintf(buf, "not defined\n"); | |
387 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); | |
388 | } | |
389 | ||
390 | static ssize_t suspend_opmode_show(struct regulator_dev *rdev, | |
391 | unsigned int mode, char *buf) | |
392 | { | |
393 | switch (mode) { | |
394 | case REGULATOR_MODE_FAST: | |
395 | return sprintf(buf, "fast\n"); | |
396 | case REGULATOR_MODE_NORMAL: | |
397 | return sprintf(buf, "normal\n"); | |
398 | case REGULATOR_MODE_IDLE: | |
399 | return sprintf(buf, "idle\n"); | |
400 | case REGULATOR_MODE_STANDBY: | |
401 | return sprintf(buf, "standby\n"); | |
402 | } | |
403 | return sprintf(buf, "unknown\n"); | |
404 | } | |
405 | ||
406 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, | |
407 | struct device_attribute *attr, char *buf) | |
408 | { | |
409 | struct regulator_dev *rdev = to_rdev(dev); | |
410 | ||
411 | if (!rdev->constraints) | |
412 | return sprintf(buf, "not defined\n"); | |
413 | return suspend_opmode_show(rdev, | |
414 | rdev->constraints->state_mem.mode, buf); | |
415 | } | |
416 | ||
417 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
418 | struct device_attribute *attr, char *buf) | |
419 | { | |
420 | struct regulator_dev *rdev = to_rdev(dev); | |
421 | ||
422 | if (!rdev->constraints) | |
423 | return sprintf(buf, "not defined\n"); | |
424 | return suspend_opmode_show(rdev, | |
425 | rdev->constraints->state_disk.mode, buf); | |
426 | } | |
427 | ||
428 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
429 | struct device_attribute *attr, char *buf) | |
430 | { | |
431 | struct regulator_dev *rdev = to_rdev(dev); | |
432 | ||
433 | if (!rdev->constraints) | |
434 | return sprintf(buf, "not defined\n"); | |
435 | return suspend_opmode_show(rdev, | |
436 | rdev->constraints->state_standby.mode, buf); | |
437 | } | |
438 | ||
439 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
440 | struct device_attribute *attr, char *buf) | |
441 | { | |
442 | struct regulator_dev *rdev = to_rdev(dev); | |
443 | ||
444 | if (!rdev->constraints) | |
445 | return sprintf(buf, "not defined\n"); | |
446 | ||
447 | if (rdev->constraints->state_mem.enabled) | |
448 | return sprintf(buf, "enabled\n"); | |
449 | else | |
450 | return sprintf(buf, "disabled\n"); | |
451 | } | |
452 | ||
453 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
454 | struct device_attribute *attr, char *buf) | |
455 | { | |
456 | struct regulator_dev *rdev = to_rdev(dev); | |
457 | ||
458 | if (!rdev->constraints) | |
459 | return sprintf(buf, "not defined\n"); | |
460 | ||
461 | if (rdev->constraints->state_disk.enabled) | |
462 | return sprintf(buf, "enabled\n"); | |
463 | else | |
464 | return sprintf(buf, "disabled\n"); | |
465 | } | |
466 | ||
467 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
468 | struct device_attribute *attr, char *buf) | |
469 | { | |
470 | struct regulator_dev *rdev = to_rdev(dev); | |
471 | ||
472 | if (!rdev->constraints) | |
473 | return sprintf(buf, "not defined\n"); | |
474 | ||
475 | if (rdev->constraints->state_standby.enabled) | |
476 | return sprintf(buf, "enabled\n"); | |
477 | else | |
478 | return sprintf(buf, "disabled\n"); | |
479 | } | |
480 | static struct device_attribute regulator_dev_attrs[] = { | |
481 | __ATTR(microvolts, 0444, regulator_uV_show, NULL), | |
482 | __ATTR(microamps, 0444, regulator_uA_show, NULL), | |
483 | __ATTR(opmode, 0444, regulator_opmode_show, NULL), | |
484 | __ATTR(state, 0444, regulator_state_show, NULL), | |
485 | __ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL), | |
486 | __ATTR(min_microamps, 0444, regulator_min_uA_show, NULL), | |
487 | __ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL), | |
488 | __ATTR(max_microamps, 0444, regulator_max_uA_show, NULL), | |
489 | __ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL), | |
490 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), | |
491 | __ATTR(type, 0444, regulator_type_show, NULL), | |
492 | __ATTR(suspend_mem_microvolts, 0444, | |
493 | regulator_suspend_mem_uV_show, NULL), | |
494 | __ATTR(suspend_disk_microvolts, 0444, | |
495 | regulator_suspend_disk_uV_show, NULL), | |
496 | __ATTR(suspend_standby_microvolts, 0444, | |
497 | regulator_suspend_standby_uV_show, NULL), | |
498 | __ATTR(suspend_mem_mode, 0444, | |
499 | regulator_suspend_mem_mode_show, NULL), | |
500 | __ATTR(suspend_disk_mode, 0444, | |
501 | regulator_suspend_disk_mode_show, NULL), | |
502 | __ATTR(suspend_standby_mode, 0444, | |
503 | regulator_suspend_standby_mode_show, NULL), | |
504 | __ATTR(suspend_mem_state, 0444, | |
505 | regulator_suspend_mem_state_show, NULL), | |
506 | __ATTR(suspend_disk_state, 0444, | |
507 | regulator_suspend_disk_state_show, NULL), | |
508 | __ATTR(suspend_standby_state, 0444, | |
509 | regulator_suspend_standby_state_show, NULL), | |
510 | __ATTR_NULL, | |
511 | }; | |
512 | ||
513 | static void regulator_dev_release(struct device *dev) | |
514 | { | |
515 | struct regulator_dev *rdev = to_rdev(dev); | |
516 | kfree(rdev); | |
517 | } | |
518 | ||
519 | static struct class regulator_class = { | |
520 | .name = "regulator", | |
521 | .dev_release = regulator_dev_release, | |
522 | .dev_attrs = regulator_dev_attrs, | |
523 | }; | |
524 | ||
525 | /* Calculate the new optimum regulator operating mode based on the new total | |
526 | * consumer load. All locks held by caller */ | |
527 | static void drms_uA_update(struct regulator_dev *rdev) | |
528 | { | |
529 | struct regulator *sibling; | |
530 | int current_uA = 0, output_uV, input_uV, err; | |
531 | unsigned int mode; | |
532 | ||
533 | err = regulator_check_drms(rdev); | |
534 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
535 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); | |
536 | return; | |
537 | ||
538 | /* get output voltage */ | |
539 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
540 | if (output_uV <= 0) | |
541 | return; | |
542 | ||
543 | /* get input voltage */ | |
544 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
545 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
546 | else | |
547 | input_uV = rdev->constraints->input_uV; | |
548 | if (input_uV <= 0) | |
549 | return; | |
550 | ||
551 | /* calc total requested load */ | |
552 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
553 | current_uA += sibling->uA_load; | |
554 | ||
555 | /* now get the optimum mode for our new total regulator load */ | |
556 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
557 | output_uV, current_uA); | |
558 | ||
559 | /* check the new mode is allowed */ | |
560 | err = regulator_check_mode(rdev, mode); | |
561 | if (err == 0) | |
562 | rdev->desc->ops->set_mode(rdev, mode); | |
563 | } | |
564 | ||
565 | static int suspend_set_state(struct regulator_dev *rdev, | |
566 | struct regulator_state *rstate) | |
567 | { | |
568 | int ret = 0; | |
569 | ||
570 | /* enable & disable are mandatory for suspend control */ | |
571 | if (!rdev->desc->ops->set_suspend_enable || | |
572 | !rdev->desc->ops->set_suspend_disable) | |
573 | return -EINVAL; | |
574 | ||
575 | if (rstate->enabled) | |
576 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
577 | else | |
578 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
579 | if (ret < 0) { | |
580 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
581 | return ret; | |
582 | } | |
583 | ||
584 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
585 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
586 | if (ret < 0) { | |
587 | printk(KERN_ERR "%s: failed to set voltage\n", | |
588 | __func__); | |
589 | return ret; | |
590 | } | |
591 | } | |
592 | ||
593 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
594 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
595 | if (ret < 0) { | |
596 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
597 | return ret; | |
598 | } | |
599 | } | |
600 | return ret; | |
601 | } | |
602 | ||
603 | /* locks held by caller */ | |
604 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
605 | { | |
606 | if (!rdev->constraints) | |
607 | return -EINVAL; | |
608 | ||
609 | switch (state) { | |
610 | case PM_SUSPEND_STANDBY: | |
611 | return suspend_set_state(rdev, | |
612 | &rdev->constraints->state_standby); | |
613 | case PM_SUSPEND_MEM: | |
614 | return suspend_set_state(rdev, | |
615 | &rdev->constraints->state_mem); | |
616 | case PM_SUSPEND_MAX: | |
617 | return suspend_set_state(rdev, | |
618 | &rdev->constraints->state_disk); | |
619 | default: | |
620 | return -EINVAL; | |
621 | } | |
622 | } | |
623 | ||
624 | static void print_constraints(struct regulator_dev *rdev) | |
625 | { | |
626 | struct regulation_constraints *constraints = rdev->constraints; | |
627 | char buf[80]; | |
628 | int count; | |
629 | ||
630 | if (rdev->desc->type == REGULATOR_VOLTAGE) { | |
631 | if (constraints->min_uV == constraints->max_uV) | |
632 | count = sprintf(buf, "%d mV ", | |
633 | constraints->min_uV / 1000); | |
634 | else | |
635 | count = sprintf(buf, "%d <--> %d mV ", | |
636 | constraints->min_uV / 1000, | |
637 | constraints->max_uV / 1000); | |
638 | } else { | |
639 | if (constraints->min_uA == constraints->max_uA) | |
640 | count = sprintf(buf, "%d mA ", | |
641 | constraints->min_uA / 1000); | |
642 | else | |
643 | count = sprintf(buf, "%d <--> %d mA ", | |
644 | constraints->min_uA / 1000, | |
645 | constraints->max_uA / 1000); | |
646 | } | |
647 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) | |
648 | count += sprintf(buf + count, "fast "); | |
649 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
650 | count += sprintf(buf + count, "normal "); | |
651 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
652 | count += sprintf(buf + count, "idle "); | |
653 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
654 | count += sprintf(buf + count, "standby"); | |
655 | ||
656 | printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf); | |
657 | } | |
658 | ||
659 | #define REG_STR_SIZE 32 | |
660 | ||
661 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
662 | struct device *dev, | |
663 | const char *supply_name) | |
664 | { | |
665 | struct regulator *regulator; | |
666 | char buf[REG_STR_SIZE]; | |
667 | int err, size; | |
668 | ||
669 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
670 | if (regulator == NULL) | |
671 | return NULL; | |
672 | ||
673 | mutex_lock(&rdev->mutex); | |
674 | regulator->rdev = rdev; | |
675 | list_add(®ulator->list, &rdev->consumer_list); | |
676 | ||
677 | if (dev) { | |
678 | /* create a 'requested_microamps_name' sysfs entry */ | |
679 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
680 | supply_name); | |
681 | if (size >= REG_STR_SIZE) | |
682 | goto overflow_err; | |
683 | ||
684 | regulator->dev = dev; | |
685 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); | |
686 | if (regulator->dev_attr.attr.name == NULL) | |
687 | goto attr_name_err; | |
688 | ||
689 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
690 | regulator->dev_attr.attr.mode = 0444; | |
691 | regulator->dev_attr.show = device_requested_uA_show; | |
692 | err = device_create_file(dev, ®ulator->dev_attr); | |
693 | if (err < 0) { | |
694 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
695 | " load sysfs\n", __func__); | |
696 | goto attr_name_err; | |
697 | } | |
698 | ||
699 | /* also add a link to the device sysfs entry */ | |
700 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
701 | dev->kobj.name, supply_name); | |
702 | if (size >= REG_STR_SIZE) | |
703 | goto attr_err; | |
704 | ||
705 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
706 | if (regulator->supply_name == NULL) | |
707 | goto attr_err; | |
708 | ||
709 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
710 | buf); | |
711 | if (err) { | |
712 | printk(KERN_WARNING | |
713 | "%s: could not add device link %s err %d\n", | |
714 | __func__, dev->kobj.name, err); | |
715 | device_remove_file(dev, ®ulator->dev_attr); | |
716 | goto link_name_err; | |
717 | } | |
718 | } | |
719 | mutex_unlock(&rdev->mutex); | |
720 | return regulator; | |
721 | link_name_err: | |
722 | kfree(regulator->supply_name); | |
723 | attr_err: | |
724 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
725 | attr_name_err: | |
726 | kfree(regulator->dev_attr.attr.name); | |
727 | overflow_err: | |
728 | list_del(®ulator->list); | |
729 | kfree(regulator); | |
730 | mutex_unlock(&rdev->mutex); | |
731 | return NULL; | |
732 | } | |
733 | ||
734 | /** | |
735 | * regulator_get - lookup and obtain a reference to a regulator. | |
736 | * @dev: device for regulator "consumer" | |
737 | * @id: Supply name or regulator ID. | |
738 | * | |
739 | * Returns a struct regulator corresponding to the regulator producer, | |
740 | * or IS_ERR() condition containing errno. Use of supply names | |
741 | * configured via regulator_set_device_supply() is strongly | |
742 | * encouraged. | |
743 | */ | |
744 | struct regulator *regulator_get(struct device *dev, const char *id) | |
745 | { | |
746 | struct regulator_dev *rdev; | |
747 | struct regulator_map *map; | |
748 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
749 | const char *supply = id; | |
750 | ||
751 | if (id == NULL) { | |
752 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
753 | return regulator; | |
754 | } | |
755 | ||
756 | mutex_lock(®ulator_list_mutex); | |
757 | ||
758 | list_for_each_entry(map, ®ulator_map_list, list) { | |
759 | if (dev == map->dev && | |
760 | strcmp(map->supply, id) == 0) { | |
761 | supply = map->regulator; | |
762 | break; | |
763 | } | |
764 | } | |
765 | ||
766 | list_for_each_entry(rdev, ®ulator_list, list) { | |
767 | if (strcmp(supply, rdev->desc->name) == 0 && | |
768 | try_module_get(rdev->owner)) | |
769 | goto found; | |
770 | } | |
771 | printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", | |
772 | id); | |
773 | mutex_unlock(®ulator_list_mutex); | |
774 | return regulator; | |
775 | ||
776 | found: | |
777 | regulator = create_regulator(rdev, dev, id); | |
778 | if (regulator == NULL) { | |
779 | regulator = ERR_PTR(-ENOMEM); | |
780 | module_put(rdev->owner); | |
781 | } | |
782 | ||
783 | mutex_unlock(®ulator_list_mutex); | |
784 | return regulator; | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(regulator_get); | |
787 | ||
788 | /** | |
789 | * regulator_put - "free" the regulator source | |
790 | * @regulator: regulator source | |
791 | * | |
792 | * Note: drivers must ensure that all regulator_enable calls made on this | |
793 | * regulator source are balanced by regulator_disable calls prior to calling | |
794 | * this function. | |
795 | */ | |
796 | void regulator_put(struct regulator *regulator) | |
797 | { | |
798 | struct regulator_dev *rdev; | |
799 | ||
800 | if (regulator == NULL || IS_ERR(regulator)) | |
801 | return; | |
802 | ||
803 | if (regulator->enabled) { | |
804 | printk(KERN_WARNING "Releasing supply %s while enabled\n", | |
805 | regulator->supply_name); | |
806 | WARN_ON(regulator->enabled); | |
807 | regulator_disable(regulator); | |
808 | } | |
809 | ||
810 | mutex_lock(®ulator_list_mutex); | |
811 | rdev = regulator->rdev; | |
812 | ||
813 | /* remove any sysfs entries */ | |
814 | if (regulator->dev) { | |
815 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
816 | kfree(regulator->supply_name); | |
817 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
818 | kfree(regulator->dev_attr.attr.name); | |
819 | } | |
820 | list_del(®ulator->list); | |
821 | kfree(regulator); | |
822 | ||
823 | module_put(rdev->owner); | |
824 | mutex_unlock(®ulator_list_mutex); | |
825 | } | |
826 | EXPORT_SYMBOL_GPL(regulator_put); | |
827 | ||
828 | /* locks held by regulator_enable() */ | |
829 | static int _regulator_enable(struct regulator_dev *rdev) | |
830 | { | |
831 | int ret = -EINVAL; | |
832 | ||
833 | if (!rdev->constraints) { | |
834 | printk(KERN_ERR "%s: %s has no constraints\n", | |
835 | __func__, rdev->desc->name); | |
836 | return ret; | |
837 | } | |
838 | ||
839 | /* do we need to enable the supply regulator first */ | |
840 | if (rdev->supply) { | |
841 | ret = _regulator_enable(rdev->supply); | |
842 | if (ret < 0) { | |
843 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
844 | __func__, rdev->desc->name, ret); | |
845 | return ret; | |
846 | } | |
847 | } | |
848 | ||
849 | /* check voltage and requested load before enabling */ | |
850 | if (rdev->desc->ops->enable) { | |
851 | ||
852 | if (rdev->constraints && | |
853 | (rdev->constraints->valid_ops_mask & | |
854 | REGULATOR_CHANGE_DRMS)) | |
855 | drms_uA_update(rdev); | |
856 | ||
857 | ret = rdev->desc->ops->enable(rdev); | |
858 | if (ret < 0) { | |
859 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
860 | __func__, rdev->desc->name, ret); | |
861 | return ret; | |
862 | } | |
863 | rdev->use_count++; | |
864 | return ret; | |
865 | } | |
866 | ||
867 | return ret; | |
868 | } | |
869 | ||
870 | /** | |
871 | * regulator_enable - enable regulator output | |
872 | * @regulator: regulator source | |
873 | * | |
874 | * Enable the regulator output at the predefined voltage or current value. | |
875 | * NOTE: the output value can be set by other drivers, boot loader or may be | |
876 | * hardwired in the regulator. | |
877 | * NOTE: calls to regulator_enable() must be balanced with calls to | |
878 | * regulator_disable(). | |
879 | */ | |
880 | int regulator_enable(struct regulator *regulator) | |
881 | { | |
882 | int ret; | |
883 | ||
884 | if (regulator->enabled) { | |
885 | printk(KERN_CRIT "Regulator %s already enabled\n", | |
886 | regulator->supply_name); | |
887 | WARN_ON(regulator->enabled); | |
888 | return 0; | |
889 | } | |
890 | ||
891 | mutex_lock(®ulator->rdev->mutex); | |
892 | regulator->enabled = 1; | |
893 | ret = _regulator_enable(regulator->rdev); | |
894 | if (ret != 0) | |
895 | regulator->enabled = 0; | |
896 | mutex_unlock(®ulator->rdev->mutex); | |
897 | return ret; | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(regulator_enable); | |
900 | ||
901 | /* locks held by regulator_disable() */ | |
902 | static int _regulator_disable(struct regulator_dev *rdev) | |
903 | { | |
904 | int ret = 0; | |
905 | ||
906 | /* are we the last user and permitted to disable ? */ | |
907 | if (rdev->use_count == 1 && !rdev->constraints->always_on) { | |
908 | ||
909 | /* we are last user */ | |
910 | if (rdev->desc->ops->disable) { | |
911 | ret = rdev->desc->ops->disable(rdev); | |
912 | if (ret < 0) { | |
913 | printk(KERN_ERR "%s: failed to disable %s\n", | |
914 | __func__, rdev->desc->name); | |
915 | return ret; | |
916 | } | |
917 | } | |
918 | ||
919 | /* decrease our supplies ref count and disable if required */ | |
920 | if (rdev->supply) | |
921 | _regulator_disable(rdev->supply); | |
922 | ||
923 | rdev->use_count = 0; | |
924 | } else if (rdev->use_count > 1) { | |
925 | ||
926 | if (rdev->constraints && | |
927 | (rdev->constraints->valid_ops_mask & | |
928 | REGULATOR_CHANGE_DRMS)) | |
929 | drms_uA_update(rdev); | |
930 | ||
931 | rdev->use_count--; | |
932 | } | |
933 | return ret; | |
934 | } | |
935 | ||
936 | /** | |
937 | * regulator_disable - disable regulator output | |
938 | * @regulator: regulator source | |
939 | * | |
940 | * Disable the regulator output voltage or current. | |
941 | * NOTE: this will only disable the regulator output if no other consumer | |
942 | * devices have it enabled. | |
943 | * NOTE: calls to regulator_enable() must be balanced with calls to | |
944 | * regulator_disable(). | |
945 | */ | |
946 | int regulator_disable(struct regulator *regulator) | |
947 | { | |
948 | int ret; | |
949 | ||
950 | if (!regulator->enabled) { | |
951 | printk(KERN_ERR "%s: not in use by this consumer\n", | |
952 | __func__); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | mutex_lock(®ulator->rdev->mutex); | |
957 | regulator->enabled = 0; | |
958 | regulator->uA_load = 0; | |
959 | ret = _regulator_disable(regulator->rdev); | |
960 | mutex_unlock(®ulator->rdev->mutex); | |
961 | return ret; | |
962 | } | |
963 | EXPORT_SYMBOL_GPL(regulator_disable); | |
964 | ||
965 | /* locks held by regulator_force_disable() */ | |
966 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
967 | { | |
968 | int ret = 0; | |
969 | ||
970 | /* force disable */ | |
971 | if (rdev->desc->ops->disable) { | |
972 | /* ah well, who wants to live forever... */ | |
973 | ret = rdev->desc->ops->disable(rdev); | |
974 | if (ret < 0) { | |
975 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
976 | __func__, rdev->desc->name); | |
977 | return ret; | |
978 | } | |
979 | /* notify other consumers that power has been forced off */ | |
980 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, | |
981 | NULL); | |
982 | } | |
983 | ||
984 | /* decrease our supplies ref count and disable if required */ | |
985 | if (rdev->supply) | |
986 | _regulator_disable(rdev->supply); | |
987 | ||
988 | rdev->use_count = 0; | |
989 | return ret; | |
990 | } | |
991 | ||
992 | /** | |
993 | * regulator_force_disable - force disable regulator output | |
994 | * @regulator: regulator source | |
995 | * | |
996 | * Forcibly disable the regulator output voltage or current. | |
997 | * NOTE: this *will* disable the regulator output even if other consumer | |
998 | * devices have it enabled. This should be used for situations when device | |
999 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1000 | */ | |
1001 | int regulator_force_disable(struct regulator *regulator) | |
1002 | { | |
1003 | int ret; | |
1004 | ||
1005 | mutex_lock(®ulator->rdev->mutex); | |
1006 | regulator->enabled = 0; | |
1007 | regulator->uA_load = 0; | |
1008 | ret = _regulator_force_disable(regulator->rdev); | |
1009 | mutex_unlock(®ulator->rdev->mutex); | |
1010 | return ret; | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1013 | ||
1014 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1015 | { | |
1016 | int ret; | |
1017 | ||
1018 | mutex_lock(&rdev->mutex); | |
1019 | ||
1020 | /* sanity check */ | |
1021 | if (!rdev->desc->ops->is_enabled) { | |
1022 | ret = -EINVAL; | |
1023 | goto out; | |
1024 | } | |
1025 | ||
1026 | ret = rdev->desc->ops->is_enabled(rdev); | |
1027 | out: | |
1028 | mutex_unlock(&rdev->mutex); | |
1029 | return ret; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * regulator_is_enabled - is the regulator output enabled | |
1034 | * @regulator: regulator source | |
1035 | * | |
1036 | * Returns zero for disabled otherwise return number of enable requests. | |
1037 | */ | |
1038 | int regulator_is_enabled(struct regulator *regulator) | |
1039 | { | |
1040 | return _regulator_is_enabled(regulator->rdev); | |
1041 | } | |
1042 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1043 | ||
1044 | /** | |
1045 | * regulator_set_voltage - set regulator output voltage | |
1046 | * @regulator: regulator source | |
1047 | * @min_uV: Minimum required voltage in uV | |
1048 | * @max_uV: Maximum acceptable voltage in uV | |
1049 | * | |
1050 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1051 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1052 | * | |
1053 | * If the regulator is enabled then the voltage will change to the new value | |
1054 | * immediately otherwise if the regulator is disabled the regulator will | |
1055 | * output at the new voltage when enabled. | |
1056 | * | |
1057 | * NOTE: If the regulator is shared between several devices then the lowest | |
1058 | * request voltage that meets the system constraints will be used. | |
1059 | * NOTE: Regulator system constraints must be set for this regulator before | |
1060 | * calling this function otherwise this call will fail. | |
1061 | */ | |
1062 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1063 | { | |
1064 | struct regulator_dev *rdev = regulator->rdev; | |
1065 | int ret; | |
1066 | ||
1067 | mutex_lock(&rdev->mutex); | |
1068 | ||
1069 | /* sanity check */ | |
1070 | if (!rdev->desc->ops->set_voltage) { | |
1071 | ret = -EINVAL; | |
1072 | goto out; | |
1073 | } | |
1074 | ||
1075 | /* constraints check */ | |
1076 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1077 | if (ret < 0) | |
1078 | goto out; | |
1079 | regulator->min_uV = min_uV; | |
1080 | regulator->max_uV = max_uV; | |
1081 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1082 | ||
1083 | out: | |
1084 | mutex_unlock(&rdev->mutex); | |
1085 | return ret; | |
1086 | } | |
1087 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1088 | ||
1089 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1090 | { | |
1091 | /* sanity check */ | |
1092 | if (rdev->desc->ops->get_voltage) | |
1093 | return rdev->desc->ops->get_voltage(rdev); | |
1094 | else | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1098 | /** | |
1099 | * regulator_get_voltage - get regulator output voltage | |
1100 | * @regulator: regulator source | |
1101 | * | |
1102 | * This returns the current regulator voltage in uV. | |
1103 | * | |
1104 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1105 | * function should not be used to determine regulator state. | |
1106 | */ | |
1107 | int regulator_get_voltage(struct regulator *regulator) | |
1108 | { | |
1109 | int ret; | |
1110 | ||
1111 | mutex_lock(®ulator->rdev->mutex); | |
1112 | ||
1113 | ret = _regulator_get_voltage(regulator->rdev); | |
1114 | ||
1115 | mutex_unlock(®ulator->rdev->mutex); | |
1116 | ||
1117 | return ret; | |
1118 | } | |
1119 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1120 | ||
1121 | /** | |
1122 | * regulator_set_current_limit - set regulator output current limit | |
1123 | * @regulator: regulator source | |
1124 | * @min_uA: Minimuum supported current in uA | |
1125 | * @max_uA: Maximum supported current in uA | |
1126 | * | |
1127 | * Sets current sink to the desired output current. This can be set during | |
1128 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1129 | * | |
1130 | * If the regulator is enabled then the current will change to the new value | |
1131 | * immediately otherwise if the regulator is disabled the regulator will | |
1132 | * output at the new current when enabled. | |
1133 | * | |
1134 | * NOTE: Regulator system constraints must be set for this regulator before | |
1135 | * calling this function otherwise this call will fail. | |
1136 | */ | |
1137 | int regulator_set_current_limit(struct regulator *regulator, | |
1138 | int min_uA, int max_uA) | |
1139 | { | |
1140 | struct regulator_dev *rdev = regulator->rdev; | |
1141 | int ret; | |
1142 | ||
1143 | mutex_lock(&rdev->mutex); | |
1144 | ||
1145 | /* sanity check */ | |
1146 | if (!rdev->desc->ops->set_current_limit) { | |
1147 | ret = -EINVAL; | |
1148 | goto out; | |
1149 | } | |
1150 | ||
1151 | /* constraints check */ | |
1152 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1153 | if (ret < 0) | |
1154 | goto out; | |
1155 | ||
1156 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1157 | out: | |
1158 | mutex_unlock(&rdev->mutex); | |
1159 | return ret; | |
1160 | } | |
1161 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1162 | ||
1163 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1164 | { | |
1165 | int ret; | |
1166 | ||
1167 | mutex_lock(&rdev->mutex); | |
1168 | ||
1169 | /* sanity check */ | |
1170 | if (!rdev->desc->ops->get_current_limit) { | |
1171 | ret = -EINVAL; | |
1172 | goto out; | |
1173 | } | |
1174 | ||
1175 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1176 | out: | |
1177 | mutex_unlock(&rdev->mutex); | |
1178 | return ret; | |
1179 | } | |
1180 | ||
1181 | /** | |
1182 | * regulator_get_current_limit - get regulator output current | |
1183 | * @regulator: regulator source | |
1184 | * | |
1185 | * This returns the current supplied by the specified current sink in uA. | |
1186 | * | |
1187 | * NOTE: If the regulator is disabled it will return the current value. This | |
1188 | * function should not be used to determine regulator state. | |
1189 | */ | |
1190 | int regulator_get_current_limit(struct regulator *regulator) | |
1191 | { | |
1192 | return _regulator_get_current_limit(regulator->rdev); | |
1193 | } | |
1194 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1195 | ||
1196 | /** | |
1197 | * regulator_set_mode - set regulator operating mode | |
1198 | * @regulator: regulator source | |
1199 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1200 | * | |
1201 | * Set regulator operating mode to increase regulator efficiency or improve | |
1202 | * regulation performance. | |
1203 | * | |
1204 | * NOTE: Regulator system constraints must be set for this regulator before | |
1205 | * calling this function otherwise this call will fail. | |
1206 | */ | |
1207 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1208 | { | |
1209 | struct regulator_dev *rdev = regulator->rdev; | |
1210 | int ret; | |
1211 | ||
1212 | mutex_lock(&rdev->mutex); | |
1213 | ||
1214 | /* sanity check */ | |
1215 | if (!rdev->desc->ops->set_mode) { | |
1216 | ret = -EINVAL; | |
1217 | goto out; | |
1218 | } | |
1219 | ||
1220 | /* constraints check */ | |
1221 | ret = regulator_check_mode(rdev, mode); | |
1222 | if (ret < 0) | |
1223 | goto out; | |
1224 | ||
1225 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1226 | out: | |
1227 | mutex_unlock(&rdev->mutex); | |
1228 | return ret; | |
1229 | } | |
1230 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1231 | ||
1232 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1233 | { | |
1234 | int ret; | |
1235 | ||
1236 | mutex_lock(&rdev->mutex); | |
1237 | ||
1238 | /* sanity check */ | |
1239 | if (!rdev->desc->ops->get_mode) { | |
1240 | ret = -EINVAL; | |
1241 | goto out; | |
1242 | } | |
1243 | ||
1244 | ret = rdev->desc->ops->get_mode(rdev); | |
1245 | out: | |
1246 | mutex_unlock(&rdev->mutex); | |
1247 | return ret; | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * regulator_get_mode - get regulator operating mode | |
1252 | * @regulator: regulator source | |
1253 | * | |
1254 | * Get the current regulator operating mode. | |
1255 | */ | |
1256 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1257 | { | |
1258 | return _regulator_get_mode(regulator->rdev); | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1261 | ||
1262 | /** | |
1263 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1264 | * @regulator: regulator source | |
1265 | * @uA_load: load current | |
1266 | * | |
1267 | * Notifies the regulator core of a new device load. This is then used by | |
1268 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1269 | * operating mode for the new regulator loading. | |
1270 | * | |
1271 | * Consumer devices notify their supply regulator of the maximum power | |
1272 | * they will require (can be taken from device datasheet in the power | |
1273 | * consumption tables) when they change operational status and hence power | |
1274 | * state. Examples of operational state changes that can affect power | |
1275 | * consumption are :- | |
1276 | * | |
1277 | * o Device is opened / closed. | |
1278 | * o Device I/O is about to begin or has just finished. | |
1279 | * o Device is idling in between work. | |
1280 | * | |
1281 | * This information is also exported via sysfs to userspace. | |
1282 | * | |
1283 | * DRMS will sum the total requested load on the regulator and change | |
1284 | * to the most efficient operating mode if platform constraints allow. | |
1285 | * | |
1286 | * Returns the new regulator mode or error. | |
1287 | */ | |
1288 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1289 | { | |
1290 | struct regulator_dev *rdev = regulator->rdev; | |
1291 | struct regulator *consumer; | |
1292 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1293 | unsigned int mode; | |
1294 | ||
1295 | mutex_lock(&rdev->mutex); | |
1296 | ||
1297 | regulator->uA_load = uA_load; | |
1298 | ret = regulator_check_drms(rdev); | |
1299 | if (ret < 0) | |
1300 | goto out; | |
1301 | ret = -EINVAL; | |
1302 | ||
1303 | /* sanity check */ | |
1304 | if (!rdev->desc->ops->get_optimum_mode) | |
1305 | goto out; | |
1306 | ||
1307 | /* get output voltage */ | |
1308 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1309 | if (output_uV <= 0) { | |
1310 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1311 | __func__, rdev->desc->name); | |
1312 | goto out; | |
1313 | } | |
1314 | ||
1315 | /* get input voltage */ | |
1316 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1317 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1318 | else | |
1319 | input_uV = rdev->constraints->input_uV; | |
1320 | if (input_uV <= 0) { | |
1321 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1322 | __func__, rdev->desc->name); | |
1323 | goto out; | |
1324 | } | |
1325 | ||
1326 | /* calc total requested load for this regulator */ | |
1327 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
1328 | total_uA_load += consumer->uA_load; | |
1329 | ||
1330 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1331 | input_uV, output_uV, | |
1332 | total_uA_load); | |
1333 | if (ret <= 0) { | |
1334 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" | |
1335 | " %d uA %d -> %d uV\n", __func__, rdev->desc->name, | |
1336 | total_uA_load, input_uV, output_uV); | |
1337 | goto out; | |
1338 | } | |
1339 | ||
1340 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1341 | if (ret <= 0) { | |
1342 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", | |
1343 | __func__, mode, rdev->desc->name); | |
1344 | goto out; | |
1345 | } | |
1346 | ret = mode; | |
1347 | out: | |
1348 | mutex_unlock(&rdev->mutex); | |
1349 | return ret; | |
1350 | } | |
1351 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1352 | ||
1353 | /** | |
1354 | * regulator_register_notifier - register regulator event notifier | |
1355 | * @regulator: regulator source | |
1356 | * @notifier_block: notifier block | |
1357 | * | |
1358 | * Register notifier block to receive regulator events. | |
1359 | */ | |
1360 | int regulator_register_notifier(struct regulator *regulator, | |
1361 | struct notifier_block *nb) | |
1362 | { | |
1363 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1364 | nb); | |
1365 | } | |
1366 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1367 | ||
1368 | /** | |
1369 | * regulator_unregister_notifier - unregister regulator event notifier | |
1370 | * @regulator: regulator source | |
1371 | * @notifier_block: notifier block | |
1372 | * | |
1373 | * Unregister regulator event notifier block. | |
1374 | */ | |
1375 | int regulator_unregister_notifier(struct regulator *regulator, | |
1376 | struct notifier_block *nb) | |
1377 | { | |
1378 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1379 | nb); | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1382 | ||
1383 | /* notify regulator consumers and downstream regulator consumers */ | |
1384 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
1385 | unsigned long event, void *data) | |
1386 | { | |
1387 | struct regulator_dev *_rdev; | |
1388 | ||
1389 | /* call rdev chain first */ | |
1390 | mutex_lock(&rdev->mutex); | |
1391 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); | |
1392 | mutex_unlock(&rdev->mutex); | |
1393 | ||
1394 | /* now notify regulator we supply */ | |
1395 | list_for_each_entry(_rdev, &rdev->supply_list, slist) | |
1396 | _notifier_call_chain(_rdev, event, data); | |
1397 | } | |
1398 | ||
1399 | /** | |
1400 | * regulator_bulk_get - get multiple regulator consumers | |
1401 | * | |
1402 | * @dev: Device to supply | |
1403 | * @num_consumers: Number of consumers to register | |
1404 | * @consumers: Configuration of consumers; clients are stored here. | |
1405 | * | |
1406 | * @return 0 on success, an errno on failure. | |
1407 | * | |
1408 | * This helper function allows drivers to get several regulator | |
1409 | * consumers in one operation. If any of the regulators cannot be | |
1410 | * acquired then any regulators that were allocated will be freed | |
1411 | * before returning to the caller. | |
1412 | */ | |
1413 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1414 | struct regulator_bulk_data *consumers) | |
1415 | { | |
1416 | int i; | |
1417 | int ret; | |
1418 | ||
1419 | for (i = 0; i < num_consumers; i++) | |
1420 | consumers[i].consumer = NULL; | |
1421 | ||
1422 | for (i = 0; i < num_consumers; i++) { | |
1423 | consumers[i].consumer = regulator_get(dev, | |
1424 | consumers[i].supply); | |
1425 | if (IS_ERR(consumers[i].consumer)) { | |
1426 | dev_err(dev, "Failed to get supply '%s'\n", | |
1427 | consumers[i].supply); | |
1428 | ret = PTR_ERR(consumers[i].consumer); | |
1429 | consumers[i].consumer = NULL; | |
1430 | goto err; | |
1431 | } | |
1432 | } | |
1433 | ||
1434 | return 0; | |
1435 | ||
1436 | err: | |
1437 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1438 | regulator_put(consumers[i].consumer); | |
1439 | ||
1440 | return ret; | |
1441 | } | |
1442 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1443 | ||
1444 | /** | |
1445 | * regulator_bulk_enable - enable multiple regulator consumers | |
1446 | * | |
1447 | * @num_consumers: Number of consumers | |
1448 | * @consumers: Consumer data; clients are stored here. | |
1449 | * @return 0 on success, an errno on failure | |
1450 | * | |
1451 | * This convenience API allows consumers to enable multiple regulator | |
1452 | * clients in a single API call. If any consumers cannot be enabled | |
1453 | * then any others that were enabled will be disabled again prior to | |
1454 | * return. | |
1455 | */ | |
1456 | int regulator_bulk_enable(int num_consumers, | |
1457 | struct regulator_bulk_data *consumers) | |
1458 | { | |
1459 | int i; | |
1460 | int ret; | |
1461 | ||
1462 | for (i = 0; i < num_consumers; i++) { | |
1463 | ret = regulator_enable(consumers[i].consumer); | |
1464 | if (ret != 0) | |
1465 | goto err; | |
1466 | } | |
1467 | ||
1468 | return 0; | |
1469 | ||
1470 | err: | |
1471 | printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); | |
1472 | for (i = 0; i < num_consumers; i++) | |
1473 | regulator_disable(consumers[i].consumer); | |
1474 | ||
1475 | return ret; | |
1476 | } | |
1477 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
1478 | ||
1479 | /** | |
1480 | * regulator_bulk_disable - disable multiple regulator consumers | |
1481 | * | |
1482 | * @num_consumers: Number of consumers | |
1483 | * @consumers: Consumer data; clients are stored here. | |
1484 | * @return 0 on success, an errno on failure | |
1485 | * | |
1486 | * This convenience API allows consumers to disable multiple regulator | |
1487 | * clients in a single API call. If any consumers cannot be enabled | |
1488 | * then any others that were disabled will be disabled again prior to | |
1489 | * return. | |
1490 | */ | |
1491 | int regulator_bulk_disable(int num_consumers, | |
1492 | struct regulator_bulk_data *consumers) | |
1493 | { | |
1494 | int i; | |
1495 | int ret; | |
1496 | ||
1497 | for (i = 0; i < num_consumers; i++) { | |
1498 | ret = regulator_disable(consumers[i].consumer); | |
1499 | if (ret != 0) | |
1500 | goto err; | |
1501 | } | |
1502 | ||
1503 | return 0; | |
1504 | ||
1505 | err: | |
1506 | printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); | |
1507 | for (i = 0; i < num_consumers; i++) | |
1508 | regulator_enable(consumers[i].consumer); | |
1509 | ||
1510 | return ret; | |
1511 | } | |
1512 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
1513 | ||
1514 | /** | |
1515 | * regulator_bulk_free - free multiple regulator consumers | |
1516 | * | |
1517 | * @num_consumers: Number of consumers | |
1518 | * @consumers: Consumer data; clients are stored here. | |
1519 | * | |
1520 | * This convenience API allows consumers to free multiple regulator | |
1521 | * clients in a single API call. | |
1522 | */ | |
1523 | void regulator_bulk_free(int num_consumers, | |
1524 | struct regulator_bulk_data *consumers) | |
1525 | { | |
1526 | int i; | |
1527 | ||
1528 | for (i = 0; i < num_consumers; i++) { | |
1529 | regulator_put(consumers[i].consumer); | |
1530 | consumers[i].consumer = NULL; | |
1531 | } | |
1532 | } | |
1533 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
1534 | ||
1535 | /** | |
1536 | * regulator_notifier_call_chain - call regulator event notifier | |
1537 | * @regulator: regulator source | |
1538 | * @event: notifier block | |
1539 | * @data: | |
1540 | * | |
1541 | * Called by regulator drivers to notify clients a regulator event has | |
1542 | * occurred. We also notify regulator clients downstream. | |
1543 | */ | |
1544 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
1545 | unsigned long event, void *data) | |
1546 | { | |
1547 | _notifier_call_chain(rdev, event, data); | |
1548 | return NOTIFY_DONE; | |
1549 | ||
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
1552 | ||
1553 | /** | |
1554 | * regulator_register - register regulator | |
1555 | * @regulator: regulator source | |
1556 | * @reg_data: private regulator data | |
1557 | * | |
1558 | * Called by regulator drivers to register a regulator. | |
1559 | * Returns 0 on success. | |
1560 | */ | |
1561 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
1562 | void *reg_data) | |
1563 | { | |
1564 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
1565 | struct regulator_dev *rdev; | |
1566 | int ret; | |
1567 | ||
1568 | if (regulator_desc == NULL) | |
1569 | return ERR_PTR(-EINVAL); | |
1570 | ||
1571 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
1572 | return ERR_PTR(-EINVAL); | |
1573 | ||
1574 | if (!regulator_desc->type == REGULATOR_VOLTAGE && | |
1575 | !regulator_desc->type == REGULATOR_CURRENT) | |
1576 | return ERR_PTR(-EINVAL); | |
1577 | ||
1578 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); | |
1579 | if (rdev == NULL) | |
1580 | return ERR_PTR(-ENOMEM); | |
1581 | ||
1582 | mutex_lock(®ulator_list_mutex); | |
1583 | ||
1584 | mutex_init(&rdev->mutex); | |
1585 | rdev->reg_data = reg_data; | |
1586 | rdev->owner = regulator_desc->owner; | |
1587 | rdev->desc = regulator_desc; | |
1588 | INIT_LIST_HEAD(&rdev->consumer_list); | |
1589 | INIT_LIST_HEAD(&rdev->supply_list); | |
1590 | INIT_LIST_HEAD(&rdev->list); | |
1591 | INIT_LIST_HEAD(&rdev->slist); | |
1592 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
1593 | ||
1594 | rdev->dev.class = ®ulator_class; | |
1595 | device_initialize(&rdev->dev); | |
1596 | snprintf(rdev->dev.bus_id, sizeof(rdev->dev.bus_id), | |
1597 | "regulator_%ld_%s", | |
1598 | (unsigned long)atomic_inc_return(®ulator_no) - 1, | |
1599 | regulator_desc->name); | |
1600 | ||
1601 | ret = device_add(&rdev->dev); | |
1602 | if (ret == 0) | |
1603 | list_add(&rdev->list, ®ulator_list); | |
1604 | else { | |
1605 | kfree(rdev); | |
1606 | rdev = ERR_PTR(ret); | |
1607 | } | |
1608 | mutex_unlock(®ulator_list_mutex); | |
1609 | return rdev; | |
1610 | } | |
1611 | EXPORT_SYMBOL_GPL(regulator_register); | |
1612 | ||
1613 | /** | |
1614 | * regulator_unregister - unregister regulator | |
1615 | * @regulator: regulator source | |
1616 | * | |
1617 | * Called by regulator drivers to unregister a regulator. | |
1618 | */ | |
1619 | void regulator_unregister(struct regulator_dev *rdev) | |
1620 | { | |
1621 | if (rdev == NULL) | |
1622 | return; | |
1623 | ||
1624 | mutex_lock(®ulator_list_mutex); | |
1625 | list_del(&rdev->list); | |
1626 | if (rdev->supply) | |
1627 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
1628 | device_unregister(&rdev->dev); | |
1629 | mutex_unlock(®ulator_list_mutex); | |
1630 | } | |
1631 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
1632 | ||
1633 | /** | |
1634 | * regulator_set_supply - set regulator supply regulator | |
1635 | * @regulator: regulator name | |
1636 | * @supply: supply regulator name | |
1637 | * | |
1638 | * Called by platform initialisation code to set the supply regulator for this | |
1639 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1640 | * core if it's child is enabled. | |
1641 | */ | |
1642 | int regulator_set_supply(const char *regulator, const char *supply) | |
1643 | { | |
1644 | struct regulator_dev *rdev, *supply_rdev; | |
1645 | int err; | |
1646 | ||
1647 | if (regulator == NULL || supply == NULL) | |
1648 | return -EINVAL; | |
1649 | ||
1650 | mutex_lock(®ulator_list_mutex); | |
1651 | ||
1652 | list_for_each_entry(rdev, ®ulator_list, list) { | |
1653 | if (!strcmp(rdev->desc->name, regulator)) | |
1654 | goto found_regulator; | |
1655 | } | |
1656 | mutex_unlock(®ulator_list_mutex); | |
1657 | return -ENODEV; | |
1658 | ||
1659 | found_regulator: | |
1660 | list_for_each_entry(supply_rdev, ®ulator_list, list) { | |
1661 | if (!strcmp(supply_rdev->desc->name, supply)) | |
1662 | goto found_supply; | |
1663 | } | |
1664 | mutex_unlock(®ulator_list_mutex); | |
1665 | return -ENODEV; | |
1666 | ||
1667 | found_supply: | |
1668 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
1669 | "supply"); | |
1670 | if (err) { | |
1671 | printk(KERN_ERR | |
1672 | "%s: could not add device link %s err %d\n", | |
1673 | __func__, supply_rdev->dev.kobj.name, err); | |
1674 | goto out; | |
1675 | } | |
1676 | rdev->supply = supply_rdev; | |
1677 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
1678 | out: | |
1679 | mutex_unlock(®ulator_list_mutex); | |
1680 | return err; | |
1681 | } | |
1682 | EXPORT_SYMBOL_GPL(regulator_set_supply); | |
1683 | ||
1684 | /** | |
1685 | * regulator_get_supply - get regulator supply regulator | |
1686 | * @regulator: regulator name | |
1687 | * | |
1688 | * Returns the supply supply regulator name or NULL if no supply regulator | |
1689 | * exists (i.e the regulator is supplied directly from USB, Line, Battery, etc) | |
1690 | */ | |
1691 | const char *regulator_get_supply(const char *regulator) | |
1692 | { | |
1693 | struct regulator_dev *rdev; | |
1694 | ||
1695 | if (regulator == NULL) | |
1696 | return NULL; | |
1697 | ||
1698 | mutex_lock(®ulator_list_mutex); | |
1699 | list_for_each_entry(rdev, ®ulator_list, list) { | |
1700 | if (!strcmp(rdev->desc->name, regulator)) | |
1701 | goto found; | |
1702 | } | |
1703 | mutex_unlock(®ulator_list_mutex); | |
1704 | return NULL; | |
1705 | ||
1706 | found: | |
1707 | mutex_unlock(®ulator_list_mutex); | |
1708 | if (rdev->supply) | |
1709 | return rdev->supply->desc->name; | |
1710 | else | |
1711 | return NULL; | |
1712 | } | |
1713 | EXPORT_SYMBOL_GPL(regulator_get_supply); | |
1714 | ||
1715 | /** | |
1716 | * regulator_set_machine_constraints - sets regulator constraints | |
1717 | * @regulator: regulator source | |
1718 | * | |
1719 | * Allows platform initialisation code to define and constrain | |
1720 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1721 | * Constraints *must* be set by platform code in order for some | |
1722 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1723 | * set_mode. | |
1724 | */ | |
1725 | int regulator_set_machine_constraints(const char *regulator_name, | |
1726 | struct regulation_constraints *constraints) | |
1727 | { | |
1728 | struct regulator_dev *rdev; | |
1729 | int ret = 0; | |
1730 | ||
1731 | if (regulator_name == NULL) | |
1732 | return -EINVAL; | |
1733 | ||
1734 | mutex_lock(®ulator_list_mutex); | |
1735 | ||
1736 | list_for_each_entry(rdev, ®ulator_list, list) { | |
1737 | if (!strcmp(regulator_name, rdev->desc->name)) | |
1738 | goto found; | |
1739 | } | |
1740 | ret = -ENODEV; | |
1741 | goto out; | |
1742 | ||
1743 | found: | |
1744 | mutex_lock(&rdev->mutex); | |
1745 | rdev->constraints = constraints; | |
1746 | ||
1747 | /* do we need to apply the constraint voltage */ | |
1748 | if (rdev->constraints->apply_uV && | |
1749 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
1750 | rdev->desc->ops->set_voltage) { | |
1751 | ret = rdev->desc->ops->set_voltage(rdev, | |
1752 | rdev->constraints->min_uV, rdev->constraints->max_uV); | |
1753 | if (ret < 0) { | |
1754 | printk(KERN_ERR "%s: failed to apply %duV" | |
1755 | " constraint\n", __func__, | |
1756 | rdev->constraints->min_uV); | |
1757 | rdev->constraints = NULL; | |
1758 | goto out; | |
1759 | } | |
1760 | } | |
1761 | ||
1762 | /* are we enabled at boot time by firmware / bootloader */ | |
1763 | if (rdev->constraints->boot_on) | |
1764 | rdev->use_count = 1; | |
1765 | ||
1766 | /* do we need to setup our suspend state */ | |
1767 | if (constraints->initial_state) | |
1768 | ret = suspend_prepare(rdev, constraints->initial_state); | |
1769 | ||
1770 | print_constraints(rdev); | |
1771 | mutex_unlock(&rdev->mutex); | |
1772 | ||
1773 | out: | |
1774 | mutex_unlock(®ulator_list_mutex); | |
1775 | return ret; | |
1776 | } | |
1777 | EXPORT_SYMBOL_GPL(regulator_set_machine_constraints); | |
1778 | ||
1779 | ||
1780 | /** | |
1781 | * regulator_set_device_supply: Bind a regulator to a symbolic supply | |
1782 | * @regulator: regulator source | |
1783 | * @dev: device the supply applies to | |
1784 | * @supply: symbolic name for supply | |
1785 | * | |
1786 | * Allows platform initialisation code to map physical regulator | |
1787 | * sources to symbolic names for supplies for use by devices. Devices | |
1788 | * should use these symbolic names to request regulators, avoiding the | |
1789 | * need to provide board-specific regulator names as platform data. | |
1790 | */ | |
1791 | int regulator_set_device_supply(const char *regulator, struct device *dev, | |
1792 | const char *supply) | |
1793 | { | |
1794 | struct regulator_map *node; | |
1795 | ||
1796 | if (regulator == NULL || supply == NULL) | |
1797 | return -EINVAL; | |
1798 | ||
1799 | node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); | |
1800 | if (node == NULL) | |
1801 | return -ENOMEM; | |
1802 | ||
1803 | node->regulator = regulator; | |
1804 | node->dev = dev; | |
1805 | node->supply = supply; | |
1806 | ||
1807 | mutex_lock(®ulator_list_mutex); | |
1808 | list_add(&node->list, ®ulator_map_list); | |
1809 | mutex_unlock(®ulator_list_mutex); | |
1810 | return 0; | |
1811 | } | |
1812 | EXPORT_SYMBOL_GPL(regulator_set_device_supply); | |
1813 | ||
1814 | /** | |
1815 | * regulator_suspend_prepare: prepare regulators for system wide suspend | |
1816 | * @state: system suspend state | |
1817 | * | |
1818 | * Configure each regulator with it's suspend operating parameters for state. | |
1819 | * This will usually be called by machine suspend code prior to supending. | |
1820 | */ | |
1821 | int regulator_suspend_prepare(suspend_state_t state) | |
1822 | { | |
1823 | struct regulator_dev *rdev; | |
1824 | int ret = 0; | |
1825 | ||
1826 | /* ON is handled by regulator active state */ | |
1827 | if (state == PM_SUSPEND_ON) | |
1828 | return -EINVAL; | |
1829 | ||
1830 | mutex_lock(®ulator_list_mutex); | |
1831 | list_for_each_entry(rdev, ®ulator_list, list) { | |
1832 | ||
1833 | mutex_lock(&rdev->mutex); | |
1834 | ret = suspend_prepare(rdev, state); | |
1835 | mutex_unlock(&rdev->mutex); | |
1836 | ||
1837 | if (ret < 0) { | |
1838 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1839 | __func__, rdev->desc->name); | |
1840 | goto out; | |
1841 | } | |
1842 | } | |
1843 | out: | |
1844 | mutex_unlock(®ulator_list_mutex); | |
1845 | return ret; | |
1846 | } | |
1847 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
1848 | ||
1849 | /** | |
1850 | * rdev_get_drvdata - get rdev regulator driver data | |
1851 | * @regulator: regulator | |
1852 | * | |
1853 | * Get rdev regulator driver private data. This call can be used in the | |
1854 | * regulator driver context. | |
1855 | */ | |
1856 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
1857 | { | |
1858 | return rdev->reg_data; | |
1859 | } | |
1860 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
1861 | ||
1862 | /** | |
1863 | * regulator_get_drvdata - get regulator driver data | |
1864 | * @regulator: regulator | |
1865 | * | |
1866 | * Get regulator driver private data. This call can be used in the consumer | |
1867 | * driver context when non API regulator specific functions need to be called. | |
1868 | */ | |
1869 | void *regulator_get_drvdata(struct regulator *regulator) | |
1870 | { | |
1871 | return regulator->rdev->reg_data; | |
1872 | } | |
1873 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
1874 | ||
1875 | /** | |
1876 | * regulator_set_drvdata - set regulator driver data | |
1877 | * @regulator: regulator | |
1878 | * @data: data | |
1879 | */ | |
1880 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
1881 | { | |
1882 | regulator->rdev->reg_data = data; | |
1883 | } | |
1884 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
1885 | ||
1886 | /** | |
1887 | * regulator_get_id - get regulator ID | |
1888 | * @regulator: regulator | |
1889 | */ | |
1890 | int rdev_get_id(struct regulator_dev *rdev) | |
1891 | { | |
1892 | return rdev->desc->id; | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
1895 | ||
1896 | static int __init regulator_init(void) | |
1897 | { | |
1898 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); | |
1899 | return class_register(®ulator_class); | |
1900 | } | |
1901 | ||
1902 | /* init early to allow our consumers to complete system booting */ | |
1903 | core_initcall(regulator_init); |