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regulator: Allow boot_on regulators to be disabled by clients
[deliverable/linux.git] / drivers / regulator / core.c
1 /*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
6 *
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/device.h>
19 #include <linux/err.h>
20 #include <linux/mutex.h>
21 #include <linux/suspend.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25
26 #define REGULATOR_VERSION "0.5"
27
28 static DEFINE_MUTEX(regulator_list_mutex);
29 static LIST_HEAD(regulator_list);
30 static LIST_HEAD(regulator_map_list);
31
32 /*
33 * struct regulator_map
34 *
35 * Used to provide symbolic supply names to devices.
36 */
37 struct regulator_map {
38 struct list_head list;
39 struct device *dev;
40 const char *supply;
41 struct regulator_dev *regulator;
42 };
43
44 /*
45 * struct regulator
46 *
47 * One for each consumer device.
48 */
49 struct regulator {
50 struct device *dev;
51 struct list_head list;
52 int uA_load;
53 int min_uV;
54 int max_uV;
55 int enabled; /* count of client enables */
56 char *supply_name;
57 struct device_attribute dev_attr;
58 struct regulator_dev *rdev;
59 };
60
61 static int _regulator_is_enabled(struct regulator_dev *rdev);
62 static int _regulator_disable(struct regulator_dev *rdev);
63 static int _regulator_get_voltage(struct regulator_dev *rdev);
64 static int _regulator_get_current_limit(struct regulator_dev *rdev);
65 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
66 static void _notifier_call_chain(struct regulator_dev *rdev,
67 unsigned long event, void *data);
68
69 /* gets the regulator for a given consumer device */
70 static struct regulator *get_device_regulator(struct device *dev)
71 {
72 struct regulator *regulator = NULL;
73 struct regulator_dev *rdev;
74
75 mutex_lock(&regulator_list_mutex);
76 list_for_each_entry(rdev, &regulator_list, list) {
77 mutex_lock(&rdev->mutex);
78 list_for_each_entry(regulator, &rdev->consumer_list, list) {
79 if (regulator->dev == dev) {
80 mutex_unlock(&rdev->mutex);
81 mutex_unlock(&regulator_list_mutex);
82 return regulator;
83 }
84 }
85 mutex_unlock(&rdev->mutex);
86 }
87 mutex_unlock(&regulator_list_mutex);
88 return NULL;
89 }
90
91 /* Platform voltage constraint check */
92 static int regulator_check_voltage(struct regulator_dev *rdev,
93 int *min_uV, int *max_uV)
94 {
95 BUG_ON(*min_uV > *max_uV);
96
97 if (!rdev->constraints) {
98 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
99 rdev->desc->name);
100 return -ENODEV;
101 }
102 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
103 printk(KERN_ERR "%s: operation not allowed for %s\n",
104 __func__, rdev->desc->name);
105 return -EPERM;
106 }
107
108 if (*max_uV > rdev->constraints->max_uV)
109 *max_uV = rdev->constraints->max_uV;
110 if (*min_uV < rdev->constraints->min_uV)
111 *min_uV = rdev->constraints->min_uV;
112
113 if (*min_uV > *max_uV)
114 return -EINVAL;
115
116 return 0;
117 }
118
119 /* current constraint check */
120 static int regulator_check_current_limit(struct regulator_dev *rdev,
121 int *min_uA, int *max_uA)
122 {
123 BUG_ON(*min_uA > *max_uA);
124
125 if (!rdev->constraints) {
126 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
127 rdev->desc->name);
128 return -ENODEV;
129 }
130 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
131 printk(KERN_ERR "%s: operation not allowed for %s\n",
132 __func__, rdev->desc->name);
133 return -EPERM;
134 }
135
136 if (*max_uA > rdev->constraints->max_uA)
137 *max_uA = rdev->constraints->max_uA;
138 if (*min_uA < rdev->constraints->min_uA)
139 *min_uA = rdev->constraints->min_uA;
140
141 if (*min_uA > *max_uA)
142 return -EINVAL;
143
144 return 0;
145 }
146
147 /* operating mode constraint check */
148 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
149 {
150 switch (mode) {
151 case REGULATOR_MODE_FAST:
152 case REGULATOR_MODE_NORMAL:
153 case REGULATOR_MODE_IDLE:
154 case REGULATOR_MODE_STANDBY:
155 break;
156 default:
157 return -EINVAL;
158 }
159
160 if (!rdev->constraints) {
161 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
162 rdev->desc->name);
163 return -ENODEV;
164 }
165 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
166 printk(KERN_ERR "%s: operation not allowed for %s\n",
167 __func__, rdev->desc->name);
168 return -EPERM;
169 }
170 if (!(rdev->constraints->valid_modes_mask & mode)) {
171 printk(KERN_ERR "%s: invalid mode %x for %s\n",
172 __func__, mode, rdev->desc->name);
173 return -EINVAL;
174 }
175 return 0;
176 }
177
178 /* dynamic regulator mode switching constraint check */
179 static int regulator_check_drms(struct regulator_dev *rdev)
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_DRMS)) {
187 printk(KERN_ERR "%s: operation not allowed for %s\n",
188 __func__, rdev->desc->name);
189 return -EPERM;
190 }
191 return 0;
192 }
193
194 static ssize_t device_requested_uA_show(struct device *dev,
195 struct device_attribute *attr, char *buf)
196 {
197 struct regulator *regulator;
198
199 regulator = get_device_regulator(dev);
200 if (regulator == NULL)
201 return 0;
202
203 return sprintf(buf, "%d\n", regulator->uA_load);
204 }
205
206 static ssize_t regulator_uV_show(struct device *dev,
207 struct device_attribute *attr, char *buf)
208 {
209 struct regulator_dev *rdev = dev_get_drvdata(dev);
210 ssize_t ret;
211
212 mutex_lock(&rdev->mutex);
213 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
214 mutex_unlock(&rdev->mutex);
215
216 return ret;
217 }
218 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
219
220 static ssize_t regulator_uA_show(struct device *dev,
221 struct device_attribute *attr, char *buf)
222 {
223 struct regulator_dev *rdev = dev_get_drvdata(dev);
224
225 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
226 }
227 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
228
229 static ssize_t regulator_name_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
231 {
232 struct regulator_dev *rdev = dev_get_drvdata(dev);
233 const char *name;
234
235 if (rdev->constraints->name)
236 name = rdev->constraints->name;
237 else if (rdev->desc->name)
238 name = rdev->desc->name;
239 else
240 name = "";
241
242 return sprintf(buf, "%s\n", name);
243 }
244
245 static ssize_t regulator_print_opmode(char *buf, int mode)
246 {
247 switch (mode) {
248 case REGULATOR_MODE_FAST:
249 return sprintf(buf, "fast\n");
250 case REGULATOR_MODE_NORMAL:
251 return sprintf(buf, "normal\n");
252 case REGULATOR_MODE_IDLE:
253 return sprintf(buf, "idle\n");
254 case REGULATOR_MODE_STANDBY:
255 return sprintf(buf, "standby\n");
256 }
257 return sprintf(buf, "unknown\n");
258 }
259
260 static ssize_t regulator_opmode_show(struct device *dev,
261 struct device_attribute *attr, char *buf)
262 {
263 struct regulator_dev *rdev = dev_get_drvdata(dev);
264
265 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
266 }
267 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
268
269 static ssize_t regulator_print_state(char *buf, int state)
270 {
271 if (state > 0)
272 return sprintf(buf, "enabled\n");
273 else if (state == 0)
274 return sprintf(buf, "disabled\n");
275 else
276 return sprintf(buf, "unknown\n");
277 }
278
279 static ssize_t regulator_state_show(struct device *dev,
280 struct device_attribute *attr, char *buf)
281 {
282 struct regulator_dev *rdev = dev_get_drvdata(dev);
283
284 return regulator_print_state(buf, _regulator_is_enabled(rdev));
285 }
286 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
287
288 static ssize_t regulator_status_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290 {
291 struct regulator_dev *rdev = dev_get_drvdata(dev);
292 int status;
293 char *label;
294
295 status = rdev->desc->ops->get_status(rdev);
296 if (status < 0)
297 return status;
298
299 switch (status) {
300 case REGULATOR_STATUS_OFF:
301 label = "off";
302 break;
303 case REGULATOR_STATUS_ON:
304 label = "on";
305 break;
306 case REGULATOR_STATUS_ERROR:
307 label = "error";
308 break;
309 case REGULATOR_STATUS_FAST:
310 label = "fast";
311 break;
312 case REGULATOR_STATUS_NORMAL:
313 label = "normal";
314 break;
315 case REGULATOR_STATUS_IDLE:
316 label = "idle";
317 break;
318 case REGULATOR_STATUS_STANDBY:
319 label = "standby";
320 break;
321 default:
322 return -ERANGE;
323 }
324
325 return sprintf(buf, "%s\n", label);
326 }
327 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
328
329 static ssize_t regulator_min_uA_show(struct device *dev,
330 struct device_attribute *attr, char *buf)
331 {
332 struct regulator_dev *rdev = dev_get_drvdata(dev);
333
334 if (!rdev->constraints)
335 return sprintf(buf, "constraint not defined\n");
336
337 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
338 }
339 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
340
341 static ssize_t regulator_max_uA_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343 {
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
345
346 if (!rdev->constraints)
347 return sprintf(buf, "constraint not defined\n");
348
349 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
350 }
351 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
352
353 static ssize_t regulator_min_uV_show(struct device *dev,
354 struct device_attribute *attr, char *buf)
355 {
356 struct regulator_dev *rdev = dev_get_drvdata(dev);
357
358 if (!rdev->constraints)
359 return sprintf(buf, "constraint not defined\n");
360
361 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
362 }
363 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
364
365 static ssize_t regulator_max_uV_show(struct device *dev,
366 struct device_attribute *attr, char *buf)
367 {
368 struct regulator_dev *rdev = dev_get_drvdata(dev);
369
370 if (!rdev->constraints)
371 return sprintf(buf, "constraint not defined\n");
372
373 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
374 }
375 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
376
377 static ssize_t regulator_total_uA_show(struct device *dev,
378 struct device_attribute *attr, char *buf)
379 {
380 struct regulator_dev *rdev = dev_get_drvdata(dev);
381 struct regulator *regulator;
382 int uA = 0;
383
384 mutex_lock(&rdev->mutex);
385 list_for_each_entry(regulator, &rdev->consumer_list, list)
386 uA += regulator->uA_load;
387 mutex_unlock(&rdev->mutex);
388 return sprintf(buf, "%d\n", uA);
389 }
390 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
391
392 static ssize_t regulator_num_users_show(struct device *dev,
393 struct device_attribute *attr, char *buf)
394 {
395 struct regulator_dev *rdev = dev_get_drvdata(dev);
396 return sprintf(buf, "%d\n", rdev->use_count);
397 }
398
399 static ssize_t regulator_type_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
401 {
402 struct regulator_dev *rdev = dev_get_drvdata(dev);
403
404 switch (rdev->desc->type) {
405 case REGULATOR_VOLTAGE:
406 return sprintf(buf, "voltage\n");
407 case REGULATOR_CURRENT:
408 return sprintf(buf, "current\n");
409 }
410 return sprintf(buf, "unknown\n");
411 }
412
413 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
415 {
416 struct regulator_dev *rdev = dev_get_drvdata(dev);
417
418 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
419 }
420 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
421 regulator_suspend_mem_uV_show, NULL);
422
423 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
424 struct device_attribute *attr, char *buf)
425 {
426 struct regulator_dev *rdev = dev_get_drvdata(dev);
427
428 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
429 }
430 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
431 regulator_suspend_disk_uV_show, NULL);
432
433 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
434 struct device_attribute *attr, char *buf)
435 {
436 struct regulator_dev *rdev = dev_get_drvdata(dev);
437
438 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
439 }
440 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
441 regulator_suspend_standby_uV_show, NULL);
442
443 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
445 {
446 struct regulator_dev *rdev = dev_get_drvdata(dev);
447
448 return regulator_print_opmode(buf,
449 rdev->constraints->state_mem.mode);
450 }
451 static DEVICE_ATTR(suspend_mem_mode, 0444,
452 regulator_suspend_mem_mode_show, NULL);
453
454 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
456 {
457 struct regulator_dev *rdev = dev_get_drvdata(dev);
458
459 return regulator_print_opmode(buf,
460 rdev->constraints->state_disk.mode);
461 }
462 static DEVICE_ATTR(suspend_disk_mode, 0444,
463 regulator_suspend_disk_mode_show, NULL);
464
465 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
467 {
468 struct regulator_dev *rdev = dev_get_drvdata(dev);
469
470 return regulator_print_opmode(buf,
471 rdev->constraints->state_standby.mode);
472 }
473 static DEVICE_ATTR(suspend_standby_mode, 0444,
474 regulator_suspend_standby_mode_show, NULL);
475
476 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
477 struct device_attribute *attr, char *buf)
478 {
479 struct regulator_dev *rdev = dev_get_drvdata(dev);
480
481 return regulator_print_state(buf,
482 rdev->constraints->state_mem.enabled);
483 }
484 static DEVICE_ATTR(suspend_mem_state, 0444,
485 regulator_suspend_mem_state_show, NULL);
486
487 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
488 struct device_attribute *attr, char *buf)
489 {
490 struct regulator_dev *rdev = dev_get_drvdata(dev);
491
492 return regulator_print_state(buf,
493 rdev->constraints->state_disk.enabled);
494 }
495 static DEVICE_ATTR(suspend_disk_state, 0444,
496 regulator_suspend_disk_state_show, NULL);
497
498 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
499 struct device_attribute *attr, char *buf)
500 {
501 struct regulator_dev *rdev = dev_get_drvdata(dev);
502
503 return regulator_print_state(buf,
504 rdev->constraints->state_standby.enabled);
505 }
506 static DEVICE_ATTR(suspend_standby_state, 0444,
507 regulator_suspend_standby_state_show, NULL);
508
509
510 /*
511 * These are the only attributes are present for all regulators.
512 * Other attributes are a function of regulator functionality.
513 */
514 static struct device_attribute regulator_dev_attrs[] = {
515 __ATTR(name, 0444, regulator_name_show, NULL),
516 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
517 __ATTR(type, 0444, regulator_type_show, NULL),
518 __ATTR_NULL,
519 };
520
521 static void regulator_dev_release(struct device *dev)
522 {
523 struct regulator_dev *rdev = dev_get_drvdata(dev);
524 kfree(rdev);
525 }
526
527 static struct class regulator_class = {
528 .name = "regulator",
529 .dev_release = regulator_dev_release,
530 .dev_attrs = regulator_dev_attrs,
531 };
532
533 /* Calculate the new optimum regulator operating mode based on the new total
534 * consumer load. All locks held by caller */
535 static void drms_uA_update(struct regulator_dev *rdev)
536 {
537 struct regulator *sibling;
538 int current_uA = 0, output_uV, input_uV, err;
539 unsigned int mode;
540
541 err = regulator_check_drms(rdev);
542 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
543 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
544 return;
545
546 /* get output voltage */
547 output_uV = rdev->desc->ops->get_voltage(rdev);
548 if (output_uV <= 0)
549 return;
550
551 /* get input voltage */
552 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
553 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
554 else
555 input_uV = rdev->constraints->input_uV;
556 if (input_uV <= 0)
557 return;
558
559 /* calc total requested load */
560 list_for_each_entry(sibling, &rdev->consumer_list, list)
561 current_uA += sibling->uA_load;
562
563 /* now get the optimum mode for our new total regulator load */
564 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
565 output_uV, current_uA);
566
567 /* check the new mode is allowed */
568 err = regulator_check_mode(rdev, mode);
569 if (err == 0)
570 rdev->desc->ops->set_mode(rdev, mode);
571 }
572
573 static int suspend_set_state(struct regulator_dev *rdev,
574 struct regulator_state *rstate)
575 {
576 int ret = 0;
577
578 /* enable & disable are mandatory for suspend control */
579 if (!rdev->desc->ops->set_suspend_enable ||
580 !rdev->desc->ops->set_suspend_disable) {
581 printk(KERN_ERR "%s: no way to set suspend state\n",
582 __func__);
583 return -EINVAL;
584 }
585
586 if (rstate->enabled)
587 ret = rdev->desc->ops->set_suspend_enable(rdev);
588 else
589 ret = rdev->desc->ops->set_suspend_disable(rdev);
590 if (ret < 0) {
591 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
592 return ret;
593 }
594
595 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
596 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
597 if (ret < 0) {
598 printk(KERN_ERR "%s: failed to set voltage\n",
599 __func__);
600 return ret;
601 }
602 }
603
604 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
605 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
606 if (ret < 0) {
607 printk(KERN_ERR "%s: failed to set mode\n", __func__);
608 return ret;
609 }
610 }
611 return ret;
612 }
613
614 /* locks held by caller */
615 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
616 {
617 if (!rdev->constraints)
618 return -EINVAL;
619
620 switch (state) {
621 case PM_SUSPEND_STANDBY:
622 return suspend_set_state(rdev,
623 &rdev->constraints->state_standby);
624 case PM_SUSPEND_MEM:
625 return suspend_set_state(rdev,
626 &rdev->constraints->state_mem);
627 case PM_SUSPEND_MAX:
628 return suspend_set_state(rdev,
629 &rdev->constraints->state_disk);
630 default:
631 return -EINVAL;
632 }
633 }
634
635 static void print_constraints(struct regulator_dev *rdev)
636 {
637 struct regulation_constraints *constraints = rdev->constraints;
638 char buf[80];
639 int count;
640
641 if (rdev->desc->type == REGULATOR_VOLTAGE) {
642 if (constraints->min_uV == constraints->max_uV)
643 count = sprintf(buf, "%d mV ",
644 constraints->min_uV / 1000);
645 else
646 count = sprintf(buf, "%d <--> %d mV ",
647 constraints->min_uV / 1000,
648 constraints->max_uV / 1000);
649 } else {
650 if (constraints->min_uA == constraints->max_uA)
651 count = sprintf(buf, "%d mA ",
652 constraints->min_uA / 1000);
653 else
654 count = sprintf(buf, "%d <--> %d mA ",
655 constraints->min_uA / 1000,
656 constraints->max_uA / 1000);
657 }
658 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
659 count += sprintf(buf + count, "fast ");
660 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
661 count += sprintf(buf + count, "normal ");
662 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
663 count += sprintf(buf + count, "idle ");
664 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
665 count += sprintf(buf + count, "standby");
666
667 printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
668 }
669
670 /**
671 * set_machine_constraints - sets regulator constraints
672 * @rdev: regulator source
673 * @constraints: constraints to apply
674 *
675 * Allows platform initialisation code to define and constrain
676 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
677 * Constraints *must* be set by platform code in order for some
678 * regulator operations to proceed i.e. set_voltage, set_current_limit,
679 * set_mode.
680 */
681 static int set_machine_constraints(struct regulator_dev *rdev,
682 struct regulation_constraints *constraints)
683 {
684 int ret = 0;
685 const char *name;
686 struct regulator_ops *ops = rdev->desc->ops;
687
688 if (constraints->name)
689 name = constraints->name;
690 else if (rdev->desc->name)
691 name = rdev->desc->name;
692 else
693 name = "regulator";
694
695 /* constrain machine-level voltage specs to fit
696 * the actual range supported by this regulator.
697 */
698 if (ops->list_voltage && rdev->desc->n_voltages) {
699 int count = rdev->desc->n_voltages;
700 int i;
701 int min_uV = INT_MAX;
702 int max_uV = INT_MIN;
703 int cmin = constraints->min_uV;
704 int cmax = constraints->max_uV;
705
706 /* it's safe to autoconfigure fixed-voltage supplies */
707 if (count == 1 && !cmin) {
708 cmin = INT_MIN;
709 cmax = INT_MAX;
710 }
711
712 /* voltage constraints are optional */
713 if ((cmin == 0) && (cmax == 0))
714 goto out;
715
716 /* else require explicit machine-level constraints */
717 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
718 pr_err("%s: %s '%s' voltage constraints\n",
719 __func__, "invalid", name);
720 ret = -EINVAL;
721 goto out;
722 }
723
724 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
725 for (i = 0; i < count; i++) {
726 int value;
727
728 value = ops->list_voltage(rdev, i);
729 if (value <= 0)
730 continue;
731
732 /* maybe adjust [min_uV..max_uV] */
733 if (value >= cmin && value < min_uV)
734 min_uV = value;
735 if (value <= cmax && value > max_uV)
736 max_uV = value;
737 }
738
739 /* final: [min_uV..max_uV] valid iff constraints valid */
740 if (max_uV < min_uV) {
741 pr_err("%s: %s '%s' voltage constraints\n",
742 __func__, "unsupportable", name);
743 ret = -EINVAL;
744 goto out;
745 }
746
747 /* use regulator's subset of machine constraints */
748 if (constraints->min_uV < min_uV) {
749 pr_debug("%s: override '%s' %s, %d -> %d\n",
750 __func__, name, "min_uV",
751 constraints->min_uV, min_uV);
752 constraints->min_uV = min_uV;
753 }
754 if (constraints->max_uV > max_uV) {
755 pr_debug("%s: override '%s' %s, %d -> %d\n",
756 __func__, name, "max_uV",
757 constraints->max_uV, max_uV);
758 constraints->max_uV = max_uV;
759 }
760 }
761
762 rdev->constraints = constraints;
763
764 /* do we need to apply the constraint voltage */
765 if (rdev->constraints->apply_uV &&
766 rdev->constraints->min_uV == rdev->constraints->max_uV &&
767 ops->set_voltage) {
768 ret = ops->set_voltage(rdev,
769 rdev->constraints->min_uV, rdev->constraints->max_uV);
770 if (ret < 0) {
771 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
772 __func__,
773 rdev->constraints->min_uV, name);
774 rdev->constraints = NULL;
775 goto out;
776 }
777 }
778
779 /* do we need to setup our suspend state */
780 if (constraints->initial_state) {
781 ret = suspend_prepare(rdev, constraints->initial_state);
782 if (ret < 0) {
783 printk(KERN_ERR "%s: failed to set suspend state for %s\n",
784 __func__, name);
785 rdev->constraints = NULL;
786 goto out;
787 }
788 }
789
790 if (constraints->initial_mode) {
791 if (!ops->set_mode) {
792 printk(KERN_ERR "%s: no set_mode operation for %s\n",
793 __func__, name);
794 ret = -EINVAL;
795 goto out;
796 }
797
798 ret = ops->set_mode(rdev, constraints->initial_mode);
799 if (ret < 0) {
800 printk(KERN_ERR
801 "%s: failed to set initial mode for %s: %d\n",
802 __func__, name, ret);
803 goto out;
804 }
805 }
806
807 /* If the constraints say the regulator should be on at this point
808 * and we have control then make sure it is enabled.
809 */
810 if ((constraints->always_on || constraints->boot_on) && ops->enable) {
811 ret = ops->enable(rdev);
812 if (ret < 0) {
813 printk(KERN_ERR "%s: failed to enable %s\n",
814 __func__, name);
815 rdev->constraints = NULL;
816 goto out;
817 }
818 }
819
820 print_constraints(rdev);
821 out:
822 return ret;
823 }
824
825 /**
826 * set_supply - set regulator supply regulator
827 * @rdev: regulator name
828 * @supply_rdev: supply regulator name
829 *
830 * Called by platform initialisation code to set the supply regulator for this
831 * regulator. This ensures that a regulators supply will also be enabled by the
832 * core if it's child is enabled.
833 */
834 static int set_supply(struct regulator_dev *rdev,
835 struct regulator_dev *supply_rdev)
836 {
837 int err;
838
839 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
840 "supply");
841 if (err) {
842 printk(KERN_ERR
843 "%s: could not add device link %s err %d\n",
844 __func__, supply_rdev->dev.kobj.name, err);
845 goto out;
846 }
847 rdev->supply = supply_rdev;
848 list_add(&rdev->slist, &supply_rdev->supply_list);
849 out:
850 return err;
851 }
852
853 /**
854 * set_consumer_device_supply: Bind a regulator to a symbolic supply
855 * @rdev: regulator source
856 * @consumer_dev: device the supply applies to
857 * @supply: symbolic name for supply
858 *
859 * Allows platform initialisation code to map physical regulator
860 * sources to symbolic names for supplies for use by devices. Devices
861 * should use these symbolic names to request regulators, avoiding the
862 * need to provide board-specific regulator names as platform data.
863 */
864 static int set_consumer_device_supply(struct regulator_dev *rdev,
865 struct device *consumer_dev, const char *supply)
866 {
867 struct regulator_map *node;
868
869 if (supply == NULL)
870 return -EINVAL;
871
872 list_for_each_entry(node, &regulator_map_list, list) {
873 if (consumer_dev != node->dev)
874 continue;
875 if (strcmp(node->supply, supply) != 0)
876 continue;
877
878 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
879 dev_name(&node->regulator->dev),
880 node->regulator->desc->name,
881 supply,
882 dev_name(&rdev->dev), rdev->desc->name);
883 return -EBUSY;
884 }
885
886 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
887 if (node == NULL)
888 return -ENOMEM;
889
890 node->regulator = rdev;
891 node->dev = consumer_dev;
892 node->supply = supply;
893
894 list_add(&node->list, &regulator_map_list);
895 return 0;
896 }
897
898 static void unset_consumer_device_supply(struct regulator_dev *rdev,
899 struct device *consumer_dev)
900 {
901 struct regulator_map *node, *n;
902
903 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
904 if (rdev == node->regulator &&
905 consumer_dev == node->dev) {
906 list_del(&node->list);
907 kfree(node);
908 return;
909 }
910 }
911 }
912
913 static void unset_regulator_supplies(struct regulator_dev *rdev)
914 {
915 struct regulator_map *node, *n;
916
917 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
918 if (rdev == node->regulator) {
919 list_del(&node->list);
920 kfree(node);
921 return;
922 }
923 }
924 }
925
926 #define REG_STR_SIZE 32
927
928 static struct regulator *create_regulator(struct regulator_dev *rdev,
929 struct device *dev,
930 const char *supply_name)
931 {
932 struct regulator *regulator;
933 char buf[REG_STR_SIZE];
934 int err, size;
935
936 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
937 if (regulator == NULL)
938 return NULL;
939
940 mutex_lock(&rdev->mutex);
941 regulator->rdev = rdev;
942 list_add(&regulator->list, &rdev->consumer_list);
943
944 if (dev) {
945 /* create a 'requested_microamps_name' sysfs entry */
946 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
947 supply_name);
948 if (size >= REG_STR_SIZE)
949 goto overflow_err;
950
951 regulator->dev = dev;
952 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
953 if (regulator->dev_attr.attr.name == NULL)
954 goto attr_name_err;
955
956 regulator->dev_attr.attr.owner = THIS_MODULE;
957 regulator->dev_attr.attr.mode = 0444;
958 regulator->dev_attr.show = device_requested_uA_show;
959 err = device_create_file(dev, &regulator->dev_attr);
960 if (err < 0) {
961 printk(KERN_WARNING "%s: could not add regulator_dev"
962 " load sysfs\n", __func__);
963 goto attr_name_err;
964 }
965
966 /* also add a link to the device sysfs entry */
967 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
968 dev->kobj.name, supply_name);
969 if (size >= REG_STR_SIZE)
970 goto attr_err;
971
972 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
973 if (regulator->supply_name == NULL)
974 goto attr_err;
975
976 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
977 buf);
978 if (err) {
979 printk(KERN_WARNING
980 "%s: could not add device link %s err %d\n",
981 __func__, dev->kobj.name, err);
982 device_remove_file(dev, &regulator->dev_attr);
983 goto link_name_err;
984 }
985 }
986 mutex_unlock(&rdev->mutex);
987 return regulator;
988 link_name_err:
989 kfree(regulator->supply_name);
990 attr_err:
991 device_remove_file(regulator->dev, &regulator->dev_attr);
992 attr_name_err:
993 kfree(regulator->dev_attr.attr.name);
994 overflow_err:
995 list_del(&regulator->list);
996 kfree(regulator);
997 mutex_unlock(&rdev->mutex);
998 return NULL;
999 }
1000
1001 /**
1002 * regulator_get - lookup and obtain a reference to a regulator.
1003 * @dev: device for regulator "consumer"
1004 * @id: Supply name or regulator ID.
1005 *
1006 * Returns a struct regulator corresponding to the regulator producer,
1007 * or IS_ERR() condition containing errno.
1008 *
1009 * Use of supply names configured via regulator_set_device_supply() is
1010 * strongly encouraged. It is recommended that the supply name used
1011 * should match the name used for the supply and/or the relevant
1012 * device pins in the datasheet.
1013 */
1014 struct regulator *regulator_get(struct device *dev, const char *id)
1015 {
1016 struct regulator_dev *rdev;
1017 struct regulator_map *map;
1018 struct regulator *regulator = ERR_PTR(-ENODEV);
1019
1020 if (id == NULL) {
1021 printk(KERN_ERR "regulator: get() with no identifier\n");
1022 return regulator;
1023 }
1024
1025 mutex_lock(&regulator_list_mutex);
1026
1027 list_for_each_entry(map, &regulator_map_list, list) {
1028 if (dev == map->dev &&
1029 strcmp(map->supply, id) == 0) {
1030 rdev = map->regulator;
1031 goto found;
1032 }
1033 }
1034 printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
1035 id);
1036 mutex_unlock(&regulator_list_mutex);
1037 return regulator;
1038
1039 found:
1040 if (!try_module_get(rdev->owner))
1041 goto out;
1042
1043 regulator = create_regulator(rdev, dev, id);
1044 if (regulator == NULL) {
1045 regulator = ERR_PTR(-ENOMEM);
1046 module_put(rdev->owner);
1047 }
1048
1049 out:
1050 mutex_unlock(&regulator_list_mutex);
1051 return regulator;
1052 }
1053 EXPORT_SYMBOL_GPL(regulator_get);
1054
1055 /**
1056 * regulator_put - "free" the regulator source
1057 * @regulator: regulator source
1058 *
1059 * Note: drivers must ensure that all regulator_enable calls made on this
1060 * regulator source are balanced by regulator_disable calls prior to calling
1061 * this function.
1062 */
1063 void regulator_put(struct regulator *regulator)
1064 {
1065 struct regulator_dev *rdev;
1066
1067 if (regulator == NULL || IS_ERR(regulator))
1068 return;
1069
1070 mutex_lock(&regulator_list_mutex);
1071 rdev = regulator->rdev;
1072
1073 if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
1074 regulator->supply_name))
1075 _regulator_disable(rdev);
1076
1077 /* remove any sysfs entries */
1078 if (regulator->dev) {
1079 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1080 kfree(regulator->supply_name);
1081 device_remove_file(regulator->dev, &regulator->dev_attr);
1082 kfree(regulator->dev_attr.attr.name);
1083 }
1084 list_del(&regulator->list);
1085 kfree(regulator);
1086
1087 module_put(rdev->owner);
1088 mutex_unlock(&regulator_list_mutex);
1089 }
1090 EXPORT_SYMBOL_GPL(regulator_put);
1091
1092 /* locks held by regulator_enable() */
1093 static int _regulator_enable(struct regulator_dev *rdev)
1094 {
1095 int ret = -EINVAL;
1096
1097 if (!rdev->constraints) {
1098 printk(KERN_ERR "%s: %s has no constraints\n",
1099 __func__, rdev->desc->name);
1100 return ret;
1101 }
1102
1103 /* do we need to enable the supply regulator first */
1104 if (rdev->supply) {
1105 ret = _regulator_enable(rdev->supply);
1106 if (ret < 0) {
1107 printk(KERN_ERR "%s: failed to enable %s: %d\n",
1108 __func__, rdev->desc->name, ret);
1109 return ret;
1110 }
1111 }
1112
1113 /* check voltage and requested load before enabling */
1114 if (rdev->desc->ops->enable) {
1115
1116 if (rdev->constraints &&
1117 (rdev->constraints->valid_ops_mask &
1118 REGULATOR_CHANGE_DRMS))
1119 drms_uA_update(rdev);
1120
1121 ret = rdev->desc->ops->enable(rdev);
1122 if (ret < 0) {
1123 printk(KERN_ERR "%s: failed to enable %s: %d\n",
1124 __func__, rdev->desc->name, ret);
1125 return ret;
1126 }
1127 rdev->use_count++;
1128 return ret;
1129 }
1130
1131 return ret;
1132 }
1133
1134 /**
1135 * regulator_enable - enable regulator output
1136 * @regulator: regulator source
1137 *
1138 * Request that the regulator be enabled with the regulator output at
1139 * the predefined voltage or current value. Calls to regulator_enable()
1140 * must be balanced with calls to regulator_disable().
1141 *
1142 * NOTE: the output value can be set by other drivers, boot loader or may be
1143 * hardwired in the regulator.
1144 */
1145 int regulator_enable(struct regulator *regulator)
1146 {
1147 struct regulator_dev *rdev = regulator->rdev;
1148 int ret = 0;
1149
1150 mutex_lock(&rdev->mutex);
1151 if (regulator->enabled == 0)
1152 ret = _regulator_enable(rdev);
1153 else if (regulator->enabled < 0)
1154 ret = -EIO;
1155 if (ret == 0)
1156 regulator->enabled++;
1157 mutex_unlock(&rdev->mutex);
1158 return ret;
1159 }
1160 EXPORT_SYMBOL_GPL(regulator_enable);
1161
1162 /* locks held by regulator_disable() */
1163 static int _regulator_disable(struct regulator_dev *rdev)
1164 {
1165 int ret = 0;
1166
1167 /* are we the last user and permitted to disable ? */
1168 if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1169
1170 /* we are last user */
1171 if (rdev->desc->ops->disable) {
1172 ret = rdev->desc->ops->disable(rdev);
1173 if (ret < 0) {
1174 printk(KERN_ERR "%s: failed to disable %s\n",
1175 __func__, rdev->desc->name);
1176 return ret;
1177 }
1178 }
1179
1180 /* decrease our supplies ref count and disable if required */
1181 if (rdev->supply)
1182 _regulator_disable(rdev->supply);
1183
1184 rdev->use_count = 0;
1185 } else if (rdev->use_count > 1) {
1186
1187 if (rdev->constraints &&
1188 (rdev->constraints->valid_ops_mask &
1189 REGULATOR_CHANGE_DRMS))
1190 drms_uA_update(rdev);
1191
1192 rdev->use_count--;
1193 }
1194 return ret;
1195 }
1196
1197 /**
1198 * regulator_disable - disable regulator output
1199 * @regulator: regulator source
1200 *
1201 * Disable the regulator output voltage or current. Calls to
1202 * regulator_enable() must be balanced with calls to
1203 * regulator_disable().
1204 *
1205 * NOTE: this will only disable the regulator output if no other consumer
1206 * devices have it enabled, the regulator device supports disabling and
1207 * machine constraints permit this operation.
1208 */
1209 int regulator_disable(struct regulator *regulator)
1210 {
1211 struct regulator_dev *rdev = regulator->rdev;
1212 int ret = 0;
1213
1214 mutex_lock(&rdev->mutex);
1215 if (regulator->enabled == 1) {
1216 ret = _regulator_disable(rdev);
1217 if (ret == 0)
1218 regulator->uA_load = 0;
1219 } else if (WARN(regulator->enabled <= 0,
1220 "unbalanced disables for supply %s\n",
1221 regulator->supply_name))
1222 ret = -EIO;
1223 if (ret == 0)
1224 regulator->enabled--;
1225 mutex_unlock(&rdev->mutex);
1226 return ret;
1227 }
1228 EXPORT_SYMBOL_GPL(regulator_disable);
1229
1230 /* locks held by regulator_force_disable() */
1231 static int _regulator_force_disable(struct regulator_dev *rdev)
1232 {
1233 int ret = 0;
1234
1235 /* force disable */
1236 if (rdev->desc->ops->disable) {
1237 /* ah well, who wants to live forever... */
1238 ret = rdev->desc->ops->disable(rdev);
1239 if (ret < 0) {
1240 printk(KERN_ERR "%s: failed to force disable %s\n",
1241 __func__, rdev->desc->name);
1242 return ret;
1243 }
1244 /* notify other consumers that power has been forced off */
1245 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1246 NULL);
1247 }
1248
1249 /* decrease our supplies ref count and disable if required */
1250 if (rdev->supply)
1251 _regulator_disable(rdev->supply);
1252
1253 rdev->use_count = 0;
1254 return ret;
1255 }
1256
1257 /**
1258 * regulator_force_disable - force disable regulator output
1259 * @regulator: regulator source
1260 *
1261 * Forcibly disable the regulator output voltage or current.
1262 * NOTE: this *will* disable the regulator output even if other consumer
1263 * devices have it enabled. This should be used for situations when device
1264 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1265 */
1266 int regulator_force_disable(struct regulator *regulator)
1267 {
1268 int ret;
1269
1270 mutex_lock(&regulator->rdev->mutex);
1271 regulator->enabled = 0;
1272 regulator->uA_load = 0;
1273 ret = _regulator_force_disable(regulator->rdev);
1274 mutex_unlock(&regulator->rdev->mutex);
1275 return ret;
1276 }
1277 EXPORT_SYMBOL_GPL(regulator_force_disable);
1278
1279 static int _regulator_is_enabled(struct regulator_dev *rdev)
1280 {
1281 int ret;
1282
1283 mutex_lock(&rdev->mutex);
1284
1285 /* sanity check */
1286 if (!rdev->desc->ops->is_enabled) {
1287 ret = -EINVAL;
1288 goto out;
1289 }
1290
1291 ret = rdev->desc->ops->is_enabled(rdev);
1292 out:
1293 mutex_unlock(&rdev->mutex);
1294 return ret;
1295 }
1296
1297 /**
1298 * regulator_is_enabled - is the regulator output enabled
1299 * @regulator: regulator source
1300 *
1301 * Returns positive if the regulator driver backing the source/client
1302 * has requested that the device be enabled, zero if it hasn't, else a
1303 * negative errno code.
1304 *
1305 * Note that the device backing this regulator handle can have multiple
1306 * users, so it might be enabled even if regulator_enable() was never
1307 * called for this particular source.
1308 */
1309 int regulator_is_enabled(struct regulator *regulator)
1310 {
1311 return _regulator_is_enabled(regulator->rdev);
1312 }
1313 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1314
1315 /**
1316 * regulator_count_voltages - count regulator_list_voltage() selectors
1317 * @regulator: regulator source
1318 *
1319 * Returns number of selectors, or negative errno. Selectors are
1320 * numbered starting at zero, and typically correspond to bitfields
1321 * in hardware registers.
1322 */
1323 int regulator_count_voltages(struct regulator *regulator)
1324 {
1325 struct regulator_dev *rdev = regulator->rdev;
1326
1327 return rdev->desc->n_voltages ? : -EINVAL;
1328 }
1329 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1330
1331 /**
1332 * regulator_list_voltage - enumerate supported voltages
1333 * @regulator: regulator source
1334 * @selector: identify voltage to list
1335 * Context: can sleep
1336 *
1337 * Returns a voltage that can be passed to @regulator_set_voltage(),
1338 * zero if this selector code can't be used on this sytem, or a
1339 * negative errno.
1340 */
1341 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1342 {
1343 struct regulator_dev *rdev = regulator->rdev;
1344 struct regulator_ops *ops = rdev->desc->ops;
1345 int ret;
1346
1347 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1348 return -EINVAL;
1349
1350 mutex_lock(&rdev->mutex);
1351 ret = ops->list_voltage(rdev, selector);
1352 mutex_unlock(&rdev->mutex);
1353
1354 if (ret > 0) {
1355 if (ret < rdev->constraints->min_uV)
1356 ret = 0;
1357 else if (ret > rdev->constraints->max_uV)
1358 ret = 0;
1359 }
1360
1361 return ret;
1362 }
1363 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1364
1365 /**
1366 * regulator_set_voltage - set regulator output voltage
1367 * @regulator: regulator source
1368 * @min_uV: Minimum required voltage in uV
1369 * @max_uV: Maximum acceptable voltage in uV
1370 *
1371 * Sets a voltage regulator to the desired output voltage. This can be set
1372 * during any regulator state. IOW, regulator can be disabled or enabled.
1373 *
1374 * If the regulator is enabled then the voltage will change to the new value
1375 * immediately otherwise if the regulator is disabled the regulator will
1376 * output at the new voltage when enabled.
1377 *
1378 * NOTE: If the regulator is shared between several devices then the lowest
1379 * request voltage that meets the system constraints will be used.
1380 * Regulator system constraints must be set for this regulator before
1381 * calling this function otherwise this call will fail.
1382 */
1383 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1384 {
1385 struct regulator_dev *rdev = regulator->rdev;
1386 int ret;
1387
1388 mutex_lock(&rdev->mutex);
1389
1390 /* sanity check */
1391 if (!rdev->desc->ops->set_voltage) {
1392 ret = -EINVAL;
1393 goto out;
1394 }
1395
1396 /* constraints check */
1397 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1398 if (ret < 0)
1399 goto out;
1400 regulator->min_uV = min_uV;
1401 regulator->max_uV = max_uV;
1402 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1403
1404 out:
1405 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1406 mutex_unlock(&rdev->mutex);
1407 return ret;
1408 }
1409 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1410
1411 static int _regulator_get_voltage(struct regulator_dev *rdev)
1412 {
1413 /* sanity check */
1414 if (rdev->desc->ops->get_voltage)
1415 return rdev->desc->ops->get_voltage(rdev);
1416 else
1417 return -EINVAL;
1418 }
1419
1420 /**
1421 * regulator_get_voltage - get regulator output voltage
1422 * @regulator: regulator source
1423 *
1424 * This returns the current regulator voltage in uV.
1425 *
1426 * NOTE: If the regulator is disabled it will return the voltage value. This
1427 * function should not be used to determine regulator state.
1428 */
1429 int regulator_get_voltage(struct regulator *regulator)
1430 {
1431 int ret;
1432
1433 mutex_lock(&regulator->rdev->mutex);
1434
1435 ret = _regulator_get_voltage(regulator->rdev);
1436
1437 mutex_unlock(&regulator->rdev->mutex);
1438
1439 return ret;
1440 }
1441 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1442
1443 /**
1444 * regulator_set_current_limit - set regulator output current limit
1445 * @regulator: regulator source
1446 * @min_uA: Minimuum supported current in uA
1447 * @max_uA: Maximum supported current in uA
1448 *
1449 * Sets current sink to the desired output current. This can be set during
1450 * any regulator state. IOW, regulator can be disabled or enabled.
1451 *
1452 * If the regulator is enabled then the current will change to the new value
1453 * immediately otherwise if the regulator is disabled the regulator will
1454 * output at the new current when enabled.
1455 *
1456 * NOTE: Regulator system constraints must be set for this regulator before
1457 * calling this function otherwise this call will fail.
1458 */
1459 int regulator_set_current_limit(struct regulator *regulator,
1460 int min_uA, int max_uA)
1461 {
1462 struct regulator_dev *rdev = regulator->rdev;
1463 int ret;
1464
1465 mutex_lock(&rdev->mutex);
1466
1467 /* sanity check */
1468 if (!rdev->desc->ops->set_current_limit) {
1469 ret = -EINVAL;
1470 goto out;
1471 }
1472
1473 /* constraints check */
1474 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1475 if (ret < 0)
1476 goto out;
1477
1478 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1479 out:
1480 mutex_unlock(&rdev->mutex);
1481 return ret;
1482 }
1483 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1484
1485 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1486 {
1487 int ret;
1488
1489 mutex_lock(&rdev->mutex);
1490
1491 /* sanity check */
1492 if (!rdev->desc->ops->get_current_limit) {
1493 ret = -EINVAL;
1494 goto out;
1495 }
1496
1497 ret = rdev->desc->ops->get_current_limit(rdev);
1498 out:
1499 mutex_unlock(&rdev->mutex);
1500 return ret;
1501 }
1502
1503 /**
1504 * regulator_get_current_limit - get regulator output current
1505 * @regulator: regulator source
1506 *
1507 * This returns the current supplied by the specified current sink in uA.
1508 *
1509 * NOTE: If the regulator is disabled it will return the current value. This
1510 * function should not be used to determine regulator state.
1511 */
1512 int regulator_get_current_limit(struct regulator *regulator)
1513 {
1514 return _regulator_get_current_limit(regulator->rdev);
1515 }
1516 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1517
1518 /**
1519 * regulator_set_mode - set regulator operating mode
1520 * @regulator: regulator source
1521 * @mode: operating mode - one of the REGULATOR_MODE constants
1522 *
1523 * Set regulator operating mode to increase regulator efficiency or improve
1524 * regulation performance.
1525 *
1526 * NOTE: Regulator system constraints must be set for this regulator before
1527 * calling this function otherwise this call will fail.
1528 */
1529 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1530 {
1531 struct regulator_dev *rdev = regulator->rdev;
1532 int ret;
1533
1534 mutex_lock(&rdev->mutex);
1535
1536 /* sanity check */
1537 if (!rdev->desc->ops->set_mode) {
1538 ret = -EINVAL;
1539 goto out;
1540 }
1541
1542 /* constraints check */
1543 ret = regulator_check_mode(rdev, mode);
1544 if (ret < 0)
1545 goto out;
1546
1547 ret = rdev->desc->ops->set_mode(rdev, mode);
1548 out:
1549 mutex_unlock(&rdev->mutex);
1550 return ret;
1551 }
1552 EXPORT_SYMBOL_GPL(regulator_set_mode);
1553
1554 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1555 {
1556 int ret;
1557
1558 mutex_lock(&rdev->mutex);
1559
1560 /* sanity check */
1561 if (!rdev->desc->ops->get_mode) {
1562 ret = -EINVAL;
1563 goto out;
1564 }
1565
1566 ret = rdev->desc->ops->get_mode(rdev);
1567 out:
1568 mutex_unlock(&rdev->mutex);
1569 return ret;
1570 }
1571
1572 /**
1573 * regulator_get_mode - get regulator operating mode
1574 * @regulator: regulator source
1575 *
1576 * Get the current regulator operating mode.
1577 */
1578 unsigned int regulator_get_mode(struct regulator *regulator)
1579 {
1580 return _regulator_get_mode(regulator->rdev);
1581 }
1582 EXPORT_SYMBOL_GPL(regulator_get_mode);
1583
1584 /**
1585 * regulator_set_optimum_mode - set regulator optimum operating mode
1586 * @regulator: regulator source
1587 * @uA_load: load current
1588 *
1589 * Notifies the regulator core of a new device load. This is then used by
1590 * DRMS (if enabled by constraints) to set the most efficient regulator
1591 * operating mode for the new regulator loading.
1592 *
1593 * Consumer devices notify their supply regulator of the maximum power
1594 * they will require (can be taken from device datasheet in the power
1595 * consumption tables) when they change operational status and hence power
1596 * state. Examples of operational state changes that can affect power
1597 * consumption are :-
1598 *
1599 * o Device is opened / closed.
1600 * o Device I/O is about to begin or has just finished.
1601 * o Device is idling in between work.
1602 *
1603 * This information is also exported via sysfs to userspace.
1604 *
1605 * DRMS will sum the total requested load on the regulator and change
1606 * to the most efficient operating mode if platform constraints allow.
1607 *
1608 * Returns the new regulator mode or error.
1609 */
1610 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1611 {
1612 struct regulator_dev *rdev = regulator->rdev;
1613 struct regulator *consumer;
1614 int ret, output_uV, input_uV, total_uA_load = 0;
1615 unsigned int mode;
1616
1617 mutex_lock(&rdev->mutex);
1618
1619 regulator->uA_load = uA_load;
1620 ret = regulator_check_drms(rdev);
1621 if (ret < 0)
1622 goto out;
1623 ret = -EINVAL;
1624
1625 /* sanity check */
1626 if (!rdev->desc->ops->get_optimum_mode)
1627 goto out;
1628
1629 /* get output voltage */
1630 output_uV = rdev->desc->ops->get_voltage(rdev);
1631 if (output_uV <= 0) {
1632 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1633 __func__, rdev->desc->name);
1634 goto out;
1635 }
1636
1637 /* get input voltage */
1638 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1639 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1640 else
1641 input_uV = rdev->constraints->input_uV;
1642 if (input_uV <= 0) {
1643 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1644 __func__, rdev->desc->name);
1645 goto out;
1646 }
1647
1648 /* calc total requested load for this regulator */
1649 list_for_each_entry(consumer, &rdev->consumer_list, list)
1650 total_uA_load += consumer->uA_load;
1651
1652 mode = rdev->desc->ops->get_optimum_mode(rdev,
1653 input_uV, output_uV,
1654 total_uA_load);
1655 ret = regulator_check_mode(rdev, mode);
1656 if (ret < 0) {
1657 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1658 " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1659 total_uA_load, input_uV, output_uV);
1660 goto out;
1661 }
1662
1663 ret = rdev->desc->ops->set_mode(rdev, mode);
1664 if (ret < 0) {
1665 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1666 __func__, mode, rdev->desc->name);
1667 goto out;
1668 }
1669 ret = mode;
1670 out:
1671 mutex_unlock(&rdev->mutex);
1672 return ret;
1673 }
1674 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1675
1676 /**
1677 * regulator_register_notifier - register regulator event notifier
1678 * @regulator: regulator source
1679 * @nb: notifier block
1680 *
1681 * Register notifier block to receive regulator events.
1682 */
1683 int regulator_register_notifier(struct regulator *regulator,
1684 struct notifier_block *nb)
1685 {
1686 return blocking_notifier_chain_register(&regulator->rdev->notifier,
1687 nb);
1688 }
1689 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1690
1691 /**
1692 * regulator_unregister_notifier - unregister regulator event notifier
1693 * @regulator: regulator source
1694 * @nb: notifier block
1695 *
1696 * Unregister regulator event notifier block.
1697 */
1698 int regulator_unregister_notifier(struct regulator *regulator,
1699 struct notifier_block *nb)
1700 {
1701 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1702 nb);
1703 }
1704 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1705
1706 /* notify regulator consumers and downstream regulator consumers.
1707 * Note mutex must be held by caller.
1708 */
1709 static void _notifier_call_chain(struct regulator_dev *rdev,
1710 unsigned long event, void *data)
1711 {
1712 struct regulator_dev *_rdev;
1713
1714 /* call rdev chain first */
1715 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1716
1717 /* now notify regulator we supply */
1718 list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1719 mutex_lock(&_rdev->mutex);
1720 _notifier_call_chain(_rdev, event, data);
1721 mutex_unlock(&_rdev->mutex);
1722 }
1723 }
1724
1725 /**
1726 * regulator_bulk_get - get multiple regulator consumers
1727 *
1728 * @dev: Device to supply
1729 * @num_consumers: Number of consumers to register
1730 * @consumers: Configuration of consumers; clients are stored here.
1731 *
1732 * @return 0 on success, an errno on failure.
1733 *
1734 * This helper function allows drivers to get several regulator
1735 * consumers in one operation. If any of the regulators cannot be
1736 * acquired then any regulators that were allocated will be freed
1737 * before returning to the caller.
1738 */
1739 int regulator_bulk_get(struct device *dev, int num_consumers,
1740 struct regulator_bulk_data *consumers)
1741 {
1742 int i;
1743 int ret;
1744
1745 for (i = 0; i < num_consumers; i++)
1746 consumers[i].consumer = NULL;
1747
1748 for (i = 0; i < num_consumers; i++) {
1749 consumers[i].consumer = regulator_get(dev,
1750 consumers[i].supply);
1751 if (IS_ERR(consumers[i].consumer)) {
1752 dev_err(dev, "Failed to get supply '%s'\n",
1753 consumers[i].supply);
1754 ret = PTR_ERR(consumers[i].consumer);
1755 consumers[i].consumer = NULL;
1756 goto err;
1757 }
1758 }
1759
1760 return 0;
1761
1762 err:
1763 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1764 regulator_put(consumers[i].consumer);
1765
1766 return ret;
1767 }
1768 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1769
1770 /**
1771 * regulator_bulk_enable - enable multiple regulator consumers
1772 *
1773 * @num_consumers: Number of consumers
1774 * @consumers: Consumer data; clients are stored here.
1775 * @return 0 on success, an errno on failure
1776 *
1777 * This convenience API allows consumers to enable multiple regulator
1778 * clients in a single API call. If any consumers cannot be enabled
1779 * then any others that were enabled will be disabled again prior to
1780 * return.
1781 */
1782 int regulator_bulk_enable(int num_consumers,
1783 struct regulator_bulk_data *consumers)
1784 {
1785 int i;
1786 int ret;
1787
1788 for (i = 0; i < num_consumers; i++) {
1789 ret = regulator_enable(consumers[i].consumer);
1790 if (ret != 0)
1791 goto err;
1792 }
1793
1794 return 0;
1795
1796 err:
1797 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1798 for (i = 0; i < num_consumers; i++)
1799 regulator_disable(consumers[i].consumer);
1800
1801 return ret;
1802 }
1803 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1804
1805 /**
1806 * regulator_bulk_disable - disable multiple regulator consumers
1807 *
1808 * @num_consumers: Number of consumers
1809 * @consumers: Consumer data; clients are stored here.
1810 * @return 0 on success, an errno on failure
1811 *
1812 * This convenience API allows consumers to disable multiple regulator
1813 * clients in a single API call. If any consumers cannot be enabled
1814 * then any others that were disabled will be disabled again prior to
1815 * return.
1816 */
1817 int regulator_bulk_disable(int num_consumers,
1818 struct regulator_bulk_data *consumers)
1819 {
1820 int i;
1821 int ret;
1822
1823 for (i = 0; i < num_consumers; i++) {
1824 ret = regulator_disable(consumers[i].consumer);
1825 if (ret != 0)
1826 goto err;
1827 }
1828
1829 return 0;
1830
1831 err:
1832 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1833 for (i = 0; i < num_consumers; i++)
1834 regulator_enable(consumers[i].consumer);
1835
1836 return ret;
1837 }
1838 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1839
1840 /**
1841 * regulator_bulk_free - free multiple regulator consumers
1842 *
1843 * @num_consumers: Number of consumers
1844 * @consumers: Consumer data; clients are stored here.
1845 *
1846 * This convenience API allows consumers to free multiple regulator
1847 * clients in a single API call.
1848 */
1849 void regulator_bulk_free(int num_consumers,
1850 struct regulator_bulk_data *consumers)
1851 {
1852 int i;
1853
1854 for (i = 0; i < num_consumers; i++) {
1855 regulator_put(consumers[i].consumer);
1856 consumers[i].consumer = NULL;
1857 }
1858 }
1859 EXPORT_SYMBOL_GPL(regulator_bulk_free);
1860
1861 /**
1862 * regulator_notifier_call_chain - call regulator event notifier
1863 * @rdev: regulator source
1864 * @event: notifier block
1865 * @data: callback-specific data.
1866 *
1867 * Called by regulator drivers to notify clients a regulator event has
1868 * occurred. We also notify regulator clients downstream.
1869 * Note lock must be held by caller.
1870 */
1871 int regulator_notifier_call_chain(struct regulator_dev *rdev,
1872 unsigned long event, void *data)
1873 {
1874 _notifier_call_chain(rdev, event, data);
1875 return NOTIFY_DONE;
1876
1877 }
1878 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1879
1880 /*
1881 * To avoid cluttering sysfs (and memory) with useless state, only
1882 * create attributes that can be meaningfully displayed.
1883 */
1884 static int add_regulator_attributes(struct regulator_dev *rdev)
1885 {
1886 struct device *dev = &rdev->dev;
1887 struct regulator_ops *ops = rdev->desc->ops;
1888 int status = 0;
1889
1890 /* some attributes need specific methods to be displayed */
1891 if (ops->get_voltage) {
1892 status = device_create_file(dev, &dev_attr_microvolts);
1893 if (status < 0)
1894 return status;
1895 }
1896 if (ops->get_current_limit) {
1897 status = device_create_file(dev, &dev_attr_microamps);
1898 if (status < 0)
1899 return status;
1900 }
1901 if (ops->get_mode) {
1902 status = device_create_file(dev, &dev_attr_opmode);
1903 if (status < 0)
1904 return status;
1905 }
1906 if (ops->is_enabled) {
1907 status = device_create_file(dev, &dev_attr_state);
1908 if (status < 0)
1909 return status;
1910 }
1911 if (ops->get_status) {
1912 status = device_create_file(dev, &dev_attr_status);
1913 if (status < 0)
1914 return status;
1915 }
1916
1917 /* some attributes are type-specific */
1918 if (rdev->desc->type == REGULATOR_CURRENT) {
1919 status = device_create_file(dev, &dev_attr_requested_microamps);
1920 if (status < 0)
1921 return status;
1922 }
1923
1924 /* all the other attributes exist to support constraints;
1925 * don't show them if there are no constraints, or if the
1926 * relevant supporting methods are missing.
1927 */
1928 if (!rdev->constraints)
1929 return status;
1930
1931 /* constraints need specific supporting methods */
1932 if (ops->set_voltage) {
1933 status = device_create_file(dev, &dev_attr_min_microvolts);
1934 if (status < 0)
1935 return status;
1936 status = device_create_file(dev, &dev_attr_max_microvolts);
1937 if (status < 0)
1938 return status;
1939 }
1940 if (ops->set_current_limit) {
1941 status = device_create_file(dev, &dev_attr_min_microamps);
1942 if (status < 0)
1943 return status;
1944 status = device_create_file(dev, &dev_attr_max_microamps);
1945 if (status < 0)
1946 return status;
1947 }
1948
1949 /* suspend mode constraints need multiple supporting methods */
1950 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
1951 return status;
1952
1953 status = device_create_file(dev, &dev_attr_suspend_standby_state);
1954 if (status < 0)
1955 return status;
1956 status = device_create_file(dev, &dev_attr_suspend_mem_state);
1957 if (status < 0)
1958 return status;
1959 status = device_create_file(dev, &dev_attr_suspend_disk_state);
1960 if (status < 0)
1961 return status;
1962
1963 if (ops->set_suspend_voltage) {
1964 status = device_create_file(dev,
1965 &dev_attr_suspend_standby_microvolts);
1966 if (status < 0)
1967 return status;
1968 status = device_create_file(dev,
1969 &dev_attr_suspend_mem_microvolts);
1970 if (status < 0)
1971 return status;
1972 status = device_create_file(dev,
1973 &dev_attr_suspend_disk_microvolts);
1974 if (status < 0)
1975 return status;
1976 }
1977
1978 if (ops->set_suspend_mode) {
1979 status = device_create_file(dev,
1980 &dev_attr_suspend_standby_mode);
1981 if (status < 0)
1982 return status;
1983 status = device_create_file(dev,
1984 &dev_attr_suspend_mem_mode);
1985 if (status < 0)
1986 return status;
1987 status = device_create_file(dev,
1988 &dev_attr_suspend_disk_mode);
1989 if (status < 0)
1990 return status;
1991 }
1992
1993 return status;
1994 }
1995
1996 /**
1997 * regulator_register - register regulator
1998 * @regulator_desc: regulator to register
1999 * @dev: struct device for the regulator
2000 * @init_data: platform provided init data, passed through by driver
2001 * @driver_data: private regulator data
2002 *
2003 * Called by regulator drivers to register a regulator.
2004 * Returns 0 on success.
2005 */
2006 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2007 struct device *dev, struct regulator_init_data *init_data,
2008 void *driver_data)
2009 {
2010 static atomic_t regulator_no = ATOMIC_INIT(0);
2011 struct regulator_dev *rdev;
2012 int ret, i;
2013
2014 if (regulator_desc == NULL)
2015 return ERR_PTR(-EINVAL);
2016
2017 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2018 return ERR_PTR(-EINVAL);
2019
2020 if (!regulator_desc->type == REGULATOR_VOLTAGE &&
2021 !regulator_desc->type == REGULATOR_CURRENT)
2022 return ERR_PTR(-EINVAL);
2023
2024 if (!init_data)
2025 return ERR_PTR(-EINVAL);
2026
2027 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2028 if (rdev == NULL)
2029 return ERR_PTR(-ENOMEM);
2030
2031 mutex_lock(&regulator_list_mutex);
2032
2033 mutex_init(&rdev->mutex);
2034 rdev->reg_data = driver_data;
2035 rdev->owner = regulator_desc->owner;
2036 rdev->desc = regulator_desc;
2037 INIT_LIST_HEAD(&rdev->consumer_list);
2038 INIT_LIST_HEAD(&rdev->supply_list);
2039 INIT_LIST_HEAD(&rdev->list);
2040 INIT_LIST_HEAD(&rdev->slist);
2041 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2042
2043 /* preform any regulator specific init */
2044 if (init_data->regulator_init) {
2045 ret = init_data->regulator_init(rdev->reg_data);
2046 if (ret < 0)
2047 goto clean;
2048 }
2049
2050 /* register with sysfs */
2051 rdev->dev.class = &regulator_class;
2052 rdev->dev.parent = dev;
2053 dev_set_name(&rdev->dev, "regulator.%d",
2054 atomic_inc_return(&regulator_no) - 1);
2055 ret = device_register(&rdev->dev);
2056 if (ret != 0)
2057 goto clean;
2058
2059 dev_set_drvdata(&rdev->dev, rdev);
2060
2061 /* set regulator constraints */
2062 ret = set_machine_constraints(rdev, &init_data->constraints);
2063 if (ret < 0)
2064 goto scrub;
2065
2066 /* add attributes supported by this regulator */
2067 ret = add_regulator_attributes(rdev);
2068 if (ret < 0)
2069 goto scrub;
2070
2071 /* set supply regulator if it exists */
2072 if (init_data->supply_regulator_dev) {
2073 ret = set_supply(rdev,
2074 dev_get_drvdata(init_data->supply_regulator_dev));
2075 if (ret < 0)
2076 goto scrub;
2077 }
2078
2079 /* add consumers devices */
2080 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2081 ret = set_consumer_device_supply(rdev,
2082 init_data->consumer_supplies[i].dev,
2083 init_data->consumer_supplies[i].supply);
2084 if (ret < 0) {
2085 for (--i; i >= 0; i--)
2086 unset_consumer_device_supply(rdev,
2087 init_data->consumer_supplies[i].dev);
2088 goto scrub;
2089 }
2090 }
2091
2092 list_add(&rdev->list, &regulator_list);
2093 out:
2094 mutex_unlock(&regulator_list_mutex);
2095 return rdev;
2096
2097 scrub:
2098 device_unregister(&rdev->dev);
2099 clean:
2100 kfree(rdev);
2101 rdev = ERR_PTR(ret);
2102 goto out;
2103 }
2104 EXPORT_SYMBOL_GPL(regulator_register);
2105
2106 /**
2107 * regulator_unregister - unregister regulator
2108 * @rdev: regulator to unregister
2109 *
2110 * Called by regulator drivers to unregister a regulator.
2111 */
2112 void regulator_unregister(struct regulator_dev *rdev)
2113 {
2114 if (rdev == NULL)
2115 return;
2116
2117 mutex_lock(&regulator_list_mutex);
2118 unset_regulator_supplies(rdev);
2119 list_del(&rdev->list);
2120 if (rdev->supply)
2121 sysfs_remove_link(&rdev->dev.kobj, "supply");
2122 device_unregister(&rdev->dev);
2123 mutex_unlock(&regulator_list_mutex);
2124 }
2125 EXPORT_SYMBOL_GPL(regulator_unregister);
2126
2127 /**
2128 * regulator_suspend_prepare - prepare regulators for system wide suspend
2129 * @state: system suspend state
2130 *
2131 * Configure each regulator with it's suspend operating parameters for state.
2132 * This will usually be called by machine suspend code prior to supending.
2133 */
2134 int regulator_suspend_prepare(suspend_state_t state)
2135 {
2136 struct regulator_dev *rdev;
2137 int ret = 0;
2138
2139 /* ON is handled by regulator active state */
2140 if (state == PM_SUSPEND_ON)
2141 return -EINVAL;
2142
2143 mutex_lock(&regulator_list_mutex);
2144 list_for_each_entry(rdev, &regulator_list, list) {
2145
2146 mutex_lock(&rdev->mutex);
2147 ret = suspend_prepare(rdev, state);
2148 mutex_unlock(&rdev->mutex);
2149
2150 if (ret < 0) {
2151 printk(KERN_ERR "%s: failed to prepare %s\n",
2152 __func__, rdev->desc->name);
2153 goto out;
2154 }
2155 }
2156 out:
2157 mutex_unlock(&regulator_list_mutex);
2158 return ret;
2159 }
2160 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2161
2162 /**
2163 * rdev_get_drvdata - get rdev regulator driver data
2164 * @rdev: regulator
2165 *
2166 * Get rdev regulator driver private data. This call can be used in the
2167 * regulator driver context.
2168 */
2169 void *rdev_get_drvdata(struct regulator_dev *rdev)
2170 {
2171 return rdev->reg_data;
2172 }
2173 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2174
2175 /**
2176 * regulator_get_drvdata - get regulator driver data
2177 * @regulator: regulator
2178 *
2179 * Get regulator driver private data. This call can be used in the consumer
2180 * driver context when non API regulator specific functions need to be called.
2181 */
2182 void *regulator_get_drvdata(struct regulator *regulator)
2183 {
2184 return regulator->rdev->reg_data;
2185 }
2186 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2187
2188 /**
2189 * regulator_set_drvdata - set regulator driver data
2190 * @regulator: regulator
2191 * @data: data
2192 */
2193 void regulator_set_drvdata(struct regulator *regulator, void *data)
2194 {
2195 regulator->rdev->reg_data = data;
2196 }
2197 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2198
2199 /**
2200 * regulator_get_id - get regulator ID
2201 * @rdev: regulator
2202 */
2203 int rdev_get_id(struct regulator_dev *rdev)
2204 {
2205 return rdev->desc->id;
2206 }
2207 EXPORT_SYMBOL_GPL(rdev_get_id);
2208
2209 struct device *rdev_get_dev(struct regulator_dev *rdev)
2210 {
2211 return &rdev->dev;
2212 }
2213 EXPORT_SYMBOL_GPL(rdev_get_dev);
2214
2215 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2216 {
2217 return reg_init_data->driver_data;
2218 }
2219 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2220
2221 static int __init regulator_init(void)
2222 {
2223 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2224 return class_register(&regulator_class);
2225 }
2226
2227 /* init early to allow our consumers to complete system booting */
2228 core_initcall(regulator_init);
Linux kernel - Deliverables
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