1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/debugfs.h>
19#include <linux/device.h>
20#include <linux/slab.h>
21#include <linux/async.h>
22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
25#include <linux/delay.h>
26#include <linux/gpio.h>
27#include <linux/of.h>
28#include <linux/regmap.h>
29#include <linux/regulator/of_regulator.h>
30#include <linux/regulator/consumer.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
33#include <linux/module.h>
34
35#define CREATE_TRACE_POINTS
36#include <trace/events/regulator.h>
37
38#include "dummy.h"
39
40#define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42#define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50
51static DEFINE_MUTEX(regulator_list_mutex);
52static LIST_HEAD(regulator_list);
53static LIST_HEAD(regulator_map_list);
54static LIST_HEAD(regulator_ena_gpio_list);
55static bool has_full_constraints;
56static bool board_wants_dummy_regulator;
57
58static struct dentry *debugfs_root;
59
60
61
62
63
64
65struct regulator_map {
66 struct list_head list;
67 const char *dev_name;
68 const char *supply;
69 struct regulator_dev *regulator;
70};
71
72
73
74
75
76
77struct regulator_enable_gpio {
78 struct list_head list;
79 int gpio;
80 u32 enable_count;
81 u32 request_count;
82 unsigned int ena_gpio_invert:1;
83};
84
85
86
87
88
89
90struct regulator {
91 struct device *dev;
92 struct list_head list;
93 unsigned int always_on:1;
94 unsigned int bypass:1;
95 int uA_load;
96 int min_uV;
97 int max_uV;
98 char *supply_name;
99 struct device_attribute dev_attr;
100 struct regulator_dev *rdev;
101 struct dentry *debugfs;
102};
103
104static int _regulator_is_enabled(struct regulator_dev *rdev);
105static int _regulator_disable(struct regulator_dev *rdev);
106static int _regulator_get_voltage(struct regulator_dev *rdev);
107static int _regulator_get_current_limit(struct regulator_dev *rdev);
108static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
109static void _notifier_call_chain(struct regulator_dev *rdev,
110 unsigned long event, void *data);
111static int _regulator_do_set_voltage(struct regulator_dev *rdev,
112 int min_uV, int max_uV);
113static struct regulator *create_regulator(struct regulator_dev *rdev,
114 struct device *dev,
115 const char *supply_name);
116
117static const char *rdev_get_name(struct regulator_dev *rdev)
118{
119 if (rdev->constraints && rdev->constraints->name)
120 return rdev->constraints->name;
121 else if (rdev->desc->name)
122 return rdev->desc->name;
123 else
124 return "";
125}
126
127
128
129
130
131
132
133
134
135
136static struct device_node *of_get_regulator(struct device *dev, const char *supply)
137{
138 struct device_node *regnode = NULL;
139 char prop_name[32];
140
141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
142
143 snprintf(prop_name, 32, "%s-supply", supply);
144 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
145
146 if (!regnode) {
147 dev_dbg(dev, "Looking up %s property in node %s failed",
148 prop_name, dev->of_node->full_name);
149 return NULL;
150 }
151 return regnode;
152}
153
154static int _regulator_can_change_status(struct regulator_dev *rdev)
155{
156 if (!rdev->constraints)
157 return 0;
158
159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
160 return 1;
161 else
162 return 0;
163}
164
165
166static int regulator_check_voltage(struct regulator_dev *rdev,
167 int *min_uV, int *max_uV)
168{
169 BUG_ON(*min_uV > *max_uV);
170
171 if (!rdev->constraints) {
172 rdev_err(rdev, "no constraints\n");
173 return -ENODEV;
174 }
175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
176 rdev_err(rdev, "operation not allowed\n");
177 return -EPERM;
178 }
179
180 if (*max_uV > rdev->constraints->max_uV)
181 *max_uV = rdev->constraints->max_uV;
182 if (*min_uV < rdev->constraints->min_uV)
183 *min_uV = rdev->constraints->min_uV;
184
185 if (*min_uV > *max_uV) {
186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
187 *min_uV, *max_uV);
188 return -EINVAL;
189 }
190
191 return 0;
192}
193
194
195
196
197static int regulator_check_consumers(struct regulator_dev *rdev,
198 int *min_uV, int *max_uV)
199{
200 struct regulator *regulator;
201
202 list_for_each_entry(regulator, &rdev->consumer_list, list) {
203
204
205
206
207 if (!regulator->min_uV && !regulator->max_uV)
208 continue;
209
210 if (*max_uV > regulator->max_uV)
211 *max_uV = regulator->max_uV;
212 if (*min_uV < regulator->min_uV)
213 *min_uV = regulator->min_uV;
214 }
215
216 if (*min_uV > *max_uV) {
217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
218 *min_uV, *max_uV);
219 return -EINVAL;
220 }
221
222 return 0;
223}
224
225
226static int regulator_check_current_limit(struct regulator_dev *rdev,
227 int *min_uA, int *max_uA)
228{
229 BUG_ON(*min_uA > *max_uA);
230
231 if (!rdev->constraints) {
232 rdev_err(rdev, "no constraints\n");
233 return -ENODEV;
234 }
235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
236 rdev_err(rdev, "operation not allowed\n");
237 return -EPERM;
238 }
239
240 if (*max_uA > rdev->constraints->max_uA)
241 *max_uA = rdev->constraints->max_uA;
242 if (*min_uA < rdev->constraints->min_uA)
243 *min_uA = rdev->constraints->min_uA;
244
245 if (*min_uA > *max_uA) {
246 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
247 *min_uA, *max_uA);
248 return -EINVAL;
249 }
250
251 return 0;
252}
253
254
255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
256{
257 switch (*mode) {
258 case REGULATOR_MODE_FAST:
259 case REGULATOR_MODE_NORMAL:
260 case REGULATOR_MODE_IDLE:
261 case REGULATOR_MODE_STANDBY:
262 break;
263 default:
264 rdev_err(rdev, "invalid mode %x specified\n", *mode);
265 return -EINVAL;
266 }
267
268 if (!rdev->constraints) {
269 rdev_err(rdev, "no constraints\n");
270 return -ENODEV;
271 }
272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
273 rdev_err(rdev, "operation not allowed\n");
274 return -EPERM;
275 }
276
277
278
279
280 while (*mode) {
281 if (rdev->constraints->valid_modes_mask & *mode)
282 return 0;
283 *mode /= 2;
284 }
285
286 return -EINVAL;
287}
288
289
290static int regulator_check_drms(struct regulator_dev *rdev)
291{
292 if (!rdev->constraints) {
293 rdev_err(rdev, "no constraints\n");
294 return -ENODEV;
295 }
296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
297 rdev_err(rdev, "operation not allowed\n");
298 return -EPERM;
299 }
300 return 0;
301}
302
303static ssize_t regulator_uV_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
305{
306 struct regulator_dev *rdev = dev_get_drvdata(dev);
307 ssize_t ret;
308
309 mutex_lock(&rdev->mutex);
310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
311 mutex_unlock(&rdev->mutex);
312
313 return ret;
314}
315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
316
317static ssize_t regulator_uA_show(struct device *dev,
318 struct device_attribute *attr, char *buf)
319{
320 struct regulator_dev *rdev = dev_get_drvdata(dev);
321
322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
323}
324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
325
326static ssize_t name_show(struct device *dev, struct device_attribute *attr,
327 char *buf)
328{
329 struct regulator_dev *rdev = dev_get_drvdata(dev);
330
331 return sprintf(buf, "%s\n", rdev_get_name(rdev));
332}
333static DEVICE_ATTR_RO(name);
334
335static ssize_t regulator_print_opmode(char *buf, int mode)
336{
337 switch (mode) {
338 case REGULATOR_MODE_FAST:
339 return sprintf(buf, "fast\n");
340 case REGULATOR_MODE_NORMAL:
341 return sprintf(buf, "normal\n");
342 case REGULATOR_MODE_IDLE:
343 return sprintf(buf, "idle\n");
344 case REGULATOR_MODE_STANDBY:
345 return sprintf(buf, "standby\n");
346 }
347 return sprintf(buf, "unknown\n");
348}
349
350static ssize_t regulator_opmode_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
354
355 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
356}
357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
358
359static ssize_t regulator_print_state(char *buf, int state)
360{
361 if (state > 0)
362 return sprintf(buf, "enabled\n");
363 else if (state == 0)
364 return sprintf(buf, "disabled\n");
365 else
366 return sprintf(buf, "unknown\n");
367}
368
369static ssize_t regulator_state_show(struct device *dev,
370 struct device_attribute *attr, char *buf)
371{
372 struct regulator_dev *rdev = dev_get_drvdata(dev);
373 ssize_t ret;
374
375 mutex_lock(&rdev->mutex);
376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
377 mutex_unlock(&rdev->mutex);
378
379 return ret;
380}
381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
382
383static ssize_t regulator_status_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
387 int status;
388 char *label;
389
390 status = rdev->desc->ops->get_status(rdev);
391 if (status < 0)
392 return status;
393
394 switch (status) {
395 case REGULATOR_STATUS_OFF:
396 label = "off";
397 break;
398 case REGULATOR_STATUS_ON:
399 label = "on";
400 break;
401 case REGULATOR_STATUS_ERROR:
402 label = "error";
403 break;
404 case REGULATOR_STATUS_FAST:
405 label = "fast";
406 break;
407 case REGULATOR_STATUS_NORMAL:
408 label = "normal";
409 break;
410 case REGULATOR_STATUS_IDLE:
411 label = "idle";
412 break;
413 case REGULATOR_STATUS_STANDBY:
414 label = "standby";
415 break;
416 case REGULATOR_STATUS_BYPASS:
417 label = "bypass";
418 break;
419 case REGULATOR_STATUS_UNDEFINED:
420 label = "undefined";
421 break;
422 default:
423 return -ERANGE;
424 }
425
426 return sprintf(buf, "%s\n", label);
427}
428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
429
430static ssize_t regulator_min_uA_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
434
435 if (!rdev->constraints)
436 return sprintf(buf, "constraint not defined\n");
437
438 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
439}
440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
441
442static ssize_t regulator_max_uA_show(struct device *dev,
443 struct device_attribute *attr, char *buf)
444{
445 struct regulator_dev *rdev = dev_get_drvdata(dev);
446
447 if (!rdev->constraints)
448 return sprintf(buf, "constraint not defined\n");
449
450 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
451}
452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
453
454static ssize_t regulator_min_uV_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
456{
457 struct regulator_dev *rdev = dev_get_drvdata(dev);
458
459 if (!rdev->constraints)
460 return sprintf(buf, "constraint not defined\n");
461
462 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
463}
464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
465
466static ssize_t regulator_max_uV_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
468{
469 struct regulator_dev *rdev = dev_get_drvdata(dev);
470
471 if (!rdev->constraints)
472 return sprintf(buf, "constraint not defined\n");
473
474 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
475}
476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
477
478static ssize_t regulator_total_uA_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
482 struct regulator *regulator;
483 int uA = 0;
484
485 mutex_lock(&rdev->mutex);
486 list_for_each_entry(regulator, &rdev->consumer_list, list)
487 uA += regulator->uA_load;
488 mutex_unlock(&rdev->mutex);
489 return sprintf(buf, "%d\n", uA);
490}
491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
492
493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
494 char *buf)
495{
496 struct regulator_dev *rdev = dev_get_drvdata(dev);
497 return sprintf(buf, "%d\n", rdev->use_count);
498}
499static DEVICE_ATTR_RO(num_users);
500
501static ssize_t type_show(struct device *dev, struct device_attribute *attr,
502 char *buf)
503{
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
505
506 switch (rdev->desc->type) {
507 case REGULATOR_VOLTAGE:
508 return sprintf(buf, "voltage\n");
509 case REGULATOR_CURRENT:
510 return sprintf(buf, "current\n");
511 }
512 return sprintf(buf, "unknown\n");
513}
514static DEVICE_ATTR_RO(type);
515
516static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
517 struct device_attribute *attr, char *buf)
518{
519 struct regulator_dev *rdev = dev_get_drvdata(dev);
520
521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
522}
523static DEVICE_ATTR(suspend_mem_microvolts, 0444,
524 regulator_suspend_mem_uV_show, NULL);
525
526static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
528{
529 struct regulator_dev *rdev = dev_get_drvdata(dev);
530
531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
532}
533static DEVICE_ATTR(suspend_disk_microvolts, 0444,
534 regulator_suspend_disk_uV_show, NULL);
535
536static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
538{
539 struct regulator_dev *rdev = dev_get_drvdata(dev);
540
541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
542}
543static DEVICE_ATTR(suspend_standby_microvolts, 0444,
544 regulator_suspend_standby_uV_show, NULL);
545
546static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
547 struct device_attribute *attr, char *buf)
548{
549 struct regulator_dev *rdev = dev_get_drvdata(dev);
550
551 return regulator_print_opmode(buf,
552 rdev->constraints->state_mem.mode);
553}
554static DEVICE_ATTR(suspend_mem_mode, 0444,
555 regulator_suspend_mem_mode_show, NULL);
556
557static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
558 struct device_attribute *attr, char *buf)
559{
560 struct regulator_dev *rdev = dev_get_drvdata(dev);
561
562 return regulator_print_opmode(buf,
563 rdev->constraints->state_disk.mode);
564}
565static DEVICE_ATTR(suspend_disk_mode, 0444,
566 regulator_suspend_disk_mode_show, NULL);
567
568static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
569 struct device_attribute *attr, char *buf)
570{
571 struct regulator_dev *rdev = dev_get_drvdata(dev);
572
573 return regulator_print_opmode(buf,
574 rdev->constraints->state_standby.mode);
575}
576static DEVICE_ATTR(suspend_standby_mode, 0444,
577 regulator_suspend_standby_mode_show, NULL);
578
579static ssize_t regulator_suspend_mem_state_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
581{
582 struct regulator_dev *rdev = dev_get_drvdata(dev);
583
584 return regulator_print_state(buf,
585 rdev->constraints->state_mem.enabled);
586}
587static DEVICE_ATTR(suspend_mem_state, 0444,
588 regulator_suspend_mem_state_show, NULL);
589
590static ssize_t regulator_suspend_disk_state_show(struct device *dev,
591 struct device_attribute *attr, char *buf)
592{
593 struct regulator_dev *rdev = dev_get_drvdata(dev);
594
595 return regulator_print_state(buf,
596 rdev->constraints->state_disk.enabled);
597}
598static DEVICE_ATTR(suspend_disk_state, 0444,
599 regulator_suspend_disk_state_show, NULL);
600
601static ssize_t regulator_suspend_standby_state_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
603{
604 struct regulator_dev *rdev = dev_get_drvdata(dev);
605
606 return regulator_print_state(buf,
607 rdev->constraints->state_standby.enabled);
608}
609static DEVICE_ATTR(suspend_standby_state, 0444,
610 regulator_suspend_standby_state_show, NULL);
611
612static ssize_t regulator_bypass_show(struct device *dev,
613 struct device_attribute *attr, char *buf)
614{
615 struct regulator_dev *rdev = dev_get_drvdata(dev);
616 const char *report;
617 bool bypass;
618 int ret;
619
620 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
621
622 if (ret != 0)
623 report = "unknown";
624 else if (bypass)
625 report = "enabled";
626 else
627 report = "disabled";
628
629 return sprintf(buf, "%s\n", report);
630}
631static DEVICE_ATTR(bypass, 0444,
632 regulator_bypass_show, NULL);
633
634
635
636
637
638static struct attribute *regulator_dev_attrs[] = {
639 &dev_attr_name.attr,
640 &dev_attr_num_users.attr,
641 &dev_attr_type.attr,
642 NULL,
643};
644ATTRIBUTE_GROUPS(regulator_dev);
645
646static void regulator_dev_release(struct device *dev)
647{
648 struct regulator_dev *rdev = dev_get_drvdata(dev);
649 kfree(rdev);
650}
651
652static struct class regulator_class = {
653 .name = "regulator",
654 .dev_release = regulator_dev_release,
655 .dev_groups = regulator_dev_groups,
656};
657
658
659
660static void drms_uA_update(struct regulator_dev *rdev)
661{
662 struct regulator *sibling;
663 int current_uA = 0, output_uV, input_uV, err;
664 unsigned int mode;
665
666 err = regulator_check_drms(rdev);
667 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
668 (!rdev->desc->ops->get_voltage &&
669 !rdev->desc->ops->get_voltage_sel) ||
670 !rdev->desc->ops->set_mode)
671 return;
672
673
674 output_uV = _regulator_get_voltage(rdev);
675 if (output_uV <= 0)
676 return;
677
678
679 input_uV = 0;
680 if (rdev->supply)
681 input_uV = regulator_get_voltage(rdev->supply);
682 if (input_uV <= 0)
683 input_uV = rdev->constraints->input_uV;
684 if (input_uV <= 0)
685 return;
686
687
688 list_for_each_entry(sibling, &rdev->consumer_list, list)
689 current_uA += sibling->uA_load;
690
691
692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
693 output_uV, current_uA);
694
695
696 err = regulator_mode_constrain(rdev, &mode);
697 if (err == 0)
698 rdev->desc->ops->set_mode(rdev, mode);
699}
700
701static int suspend_set_state(struct regulator_dev *rdev,
702 struct regulator_state *rstate)
703{
704 int ret = 0;
705
706
707
708
709
710 if (!rstate->enabled && !rstate->disabled) {
711 if (rdev->desc->ops->set_suspend_voltage ||
712 rdev->desc->ops->set_suspend_mode)
713 rdev_warn(rdev, "No configuration\n");
714 return 0;
715 }
716
717 if (rstate->enabled && rstate->disabled) {
718 rdev_err(rdev, "invalid configuration\n");
719 return -EINVAL;
720 }
721
722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
723 ret = rdev->desc->ops->set_suspend_enable(rdev);
724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
725 ret = rdev->desc->ops->set_suspend_disable(rdev);
726 else
727 ret = 0;
728
729 if (ret < 0) {
730 rdev_err(rdev, "failed to enabled/disable\n");
731 return ret;
732 }
733
734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
736 if (ret < 0) {
737 rdev_err(rdev, "failed to set voltage\n");
738 return ret;
739 }
740 }
741
742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
744 if (ret < 0) {
745 rdev_err(rdev, "failed to set mode\n");
746 return ret;
747 }
748 }
749 return ret;
750}
751
752
753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
754{
755 if (!rdev->constraints)
756 return -EINVAL;
757
758 switch (state) {
759 case PM_SUSPEND_STANDBY:
760 return suspend_set_state(rdev,
761 &rdev->constraints->state_standby);
762 case PM_SUSPEND_MEM:
763 return suspend_set_state(rdev,
764 &rdev->constraints->state_mem);
765 case PM_SUSPEND_MAX:
766 return suspend_set_state(rdev,
767 &rdev->constraints->state_disk);
768 default:
769 return -EINVAL;
770 }
771}
772
773static void print_constraints(struct regulator_dev *rdev)
774{
775 struct regulation_constraints *constraints = rdev->constraints;
776 char buf[80] = "";
777 int count = 0;
778 int ret;
779
780 if (constraints->min_uV && constraints->max_uV) {
781 if (constraints->min_uV == constraints->max_uV)
782 count += sprintf(buf + count, "%d mV ",
783 constraints->min_uV / 1000);
784 else
785 count += sprintf(buf + count, "%d <--> %d mV ",
786 constraints->min_uV / 1000,
787 constraints->max_uV / 1000);
788 }
789
790 if (!constraints->min_uV ||
791 constraints->min_uV != constraints->max_uV) {
792 ret = _regulator_get_voltage(rdev);
793 if (ret > 0)
794 count += sprintf(buf + count, "at %d mV ", ret / 1000);
795 }
796
797 if (constraints->uV_offset)
798 count += sprintf(buf, "%dmV offset ",
799 constraints->uV_offset / 1000);
800
801 if (constraints->min_uA && constraints->max_uA) {
802 if (constraints->min_uA == constraints->max_uA)
803 count += sprintf(buf + count, "%d mA ",
804 constraints->min_uA / 1000);
805 else
806 count += sprintf(buf + count, "%d <--> %d mA ",
807 constraints->min_uA / 1000,
808 constraints->max_uA / 1000);
809 }
810
811 if (!constraints->min_uA ||
812 constraints->min_uA != constraints->max_uA) {
813 ret = _regulator_get_current_limit(rdev);
814 if (ret > 0)
815 count += sprintf(buf + count, "at %d mA ", ret / 1000);
816 }
817
818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
819 count += sprintf(buf + count, "fast ");
820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
821 count += sprintf(buf + count, "normal ");
822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
823 count += sprintf(buf + count, "idle ");
824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
825 count += sprintf(buf + count, "standby");
826
827 if (!count)
828 sprintf(buf, "no parameters");
829
830 rdev_info(rdev, "%s\n", buf);
831
832 if ((constraints->min_uV != constraints->max_uV) &&
833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
834 rdev_warn(rdev,
835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
836}
837
838static int machine_constraints_voltage(struct regulator_dev *rdev,
839 struct regulation_constraints *constraints)
840{
841 struct regulator_ops *ops = rdev->desc->ops;
842 int ret;
843
844
845 if (rdev->constraints->apply_uV &&
846 rdev->constraints->min_uV == rdev->constraints->max_uV) {
847 ret = _regulator_do_set_voltage(rdev,
848 rdev->constraints->min_uV,
849 rdev->constraints->max_uV);
850 if (ret < 0) {
851 rdev_err(rdev, "failed to apply %duV constraint\n",
852 rdev->constraints->min_uV);
853 return ret;
854 }
855 }
856
857
858
859
860 if (ops->list_voltage && rdev->desc->n_voltages) {
861 int count = rdev->desc->n_voltages;
862 int i;
863 int min_uV = INT_MAX;
864 int max_uV = INT_MIN;
865 int cmin = constraints->min_uV;
866 int cmax = constraints->max_uV;
867
868
869
870 if (count == 1 && !cmin) {
871 cmin = 1;
872 cmax = INT_MAX;
873 constraints->min_uV = cmin;
874 constraints->max_uV = cmax;
875 }
876
877
878 if ((cmin == 0) && (cmax == 0))
879 return 0;
880
881
882 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
883 rdev_err(rdev, "invalid voltage constraints\n");
884 return -EINVAL;
885 }
886
887
888 for (i = 0; i < count; i++) {
889 int value;
890
891 value = ops->list_voltage(rdev, i);
892 if (value <= 0)
893 continue;
894
895
896 if (value >= cmin && value < min_uV)
897 min_uV = value;
898 if (value <= cmax && value > max_uV)
899 max_uV = value;
900 }
901
902
903 if (max_uV < min_uV) {
904 rdev_err(rdev,
905 "unsupportable voltage constraints %u-%uuV\n",
906 min_uV, max_uV);
907 return -EINVAL;
908 }
909
910
911 if (constraints->min_uV < min_uV) {
912 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
913 constraints->min_uV, min_uV);
914 constraints->min_uV = min_uV;
915 }
916 if (constraints->max_uV > max_uV) {
917 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
918 constraints->max_uV, max_uV);
919 constraints->max_uV = max_uV;
920 }
921 }
922
923 return 0;
924}
925
926
927
928
929
930
931
932
933
934
935
936
937static int set_machine_constraints(struct regulator_dev *rdev,
938 const struct regulation_constraints *constraints)
939{
940 int ret = 0;
941 struct regulator_ops *ops = rdev->desc->ops;
942
943 if (constraints)
944 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
945 GFP_KERNEL);
946 else
947 rdev->constraints = kzalloc(sizeof(*constraints),
948 GFP_KERNEL);
949 if (!rdev->constraints)
950 return -ENOMEM;
951
952 ret = machine_constraints_voltage(rdev, rdev->constraints);
953 if (ret != 0)
954 goto out;
955
956
957 if (rdev->constraints->initial_state) {
958 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
959 if (ret < 0) {
960 rdev_err(rdev, "failed to set suspend state\n");
961 goto out;
962 }
963 }
964
965 if (rdev->constraints->initial_mode) {
966 if (!ops->set_mode) {
967 rdev_err(rdev, "no set_mode operation\n");
968 ret = -EINVAL;
969 goto out;
970 }
971
972 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
973 if (ret < 0) {
974 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
975 goto out;
976 }
977 }
978
979
980
981
982 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
983 ops->enable) {
984 ret = ops->enable(rdev);
985 if (ret < 0) {
986 rdev_err(rdev, "failed to enable\n");
987 goto out;
988 }
989 }
990
991 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
992 && ops->set_ramp_delay) {
993 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
994 if (ret < 0) {
995 rdev_err(rdev, "failed to set ramp_delay\n");
996 goto out;
997 }
998 }
999
1000 print_constraints(rdev);
1001 return 0;
1002out:
1003 kfree(rdev->constraints);
1004 rdev->constraints = NULL;
1005 return ret;
1006}
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017static int set_supply(struct regulator_dev *rdev,
1018 struct regulator_dev *supply_rdev)
1019{
1020 int err;
1021
1022 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1023
1024 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1025 if (rdev->supply == NULL) {
1026 err = -ENOMEM;
1027 return err;
1028 }
1029 supply_rdev->open_count++;
1030
1031 return 0;
1032}
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045static int set_consumer_device_supply(struct regulator_dev *rdev,
1046 const char *consumer_dev_name,
1047 const char *supply)
1048{
1049 struct regulator_map *node;
1050 int has_dev;
1051
1052 if (supply == NULL)
1053 return -EINVAL;
1054
1055 if (consumer_dev_name != NULL)
1056 has_dev = 1;
1057 else
1058 has_dev = 0;
1059
1060 list_for_each_entry(node, ®ulator_map_list, list) {
1061 if (node->dev_name && consumer_dev_name) {
1062 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1063 continue;
1064 } else if (node->dev_name || consumer_dev_name) {
1065 continue;
1066 }
1067
1068 if (strcmp(node->supply, supply) != 0)
1069 continue;
1070
1071 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1072 consumer_dev_name,
1073 dev_name(&node->regulator->dev),
1074 node->regulator->desc->name,
1075 supply,
1076 dev_name(&rdev->dev), rdev_get_name(rdev));
1077 return -EBUSY;
1078 }
1079
1080 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1081 if (node == NULL)
1082 return -ENOMEM;
1083
1084 node->regulator = rdev;
1085 node->supply = supply;
1086
1087 if (has_dev) {
1088 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1089 if (node->dev_name == NULL) {
1090 kfree(node);
1091 return -ENOMEM;
1092 }
1093 }
1094
1095 list_add(&node->list, ®ulator_map_list);
1096 return 0;
1097}
1098
1099static void unset_regulator_supplies(struct regulator_dev *rdev)
1100{
1101 struct regulator_map *node, *n;
1102
1103 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1104 if (rdev == node->regulator) {
1105 list_del(&node->list);
1106 kfree(node->dev_name);
1107 kfree(node);
1108 }
1109 }
1110}
1111
1112#define REG_STR_SIZE 64
1113
1114static struct regulator *create_regulator(struct regulator_dev *rdev,
1115 struct device *dev,
1116 const char *supply_name)
1117{
1118 struct regulator *regulator;
1119 char buf[REG_STR_SIZE];
1120 int err, size;
1121
1122 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1123 if (regulator == NULL)
1124 return NULL;
1125
1126 mutex_lock(&rdev->mutex);
1127 regulator->rdev = rdev;
1128 list_add(®ulator->list, &rdev->consumer_list);
1129
1130 if (dev) {
1131 regulator->dev = dev;
1132
1133
1134 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1135 dev->kobj.name, supply_name);
1136 if (size >= REG_STR_SIZE)
1137 goto overflow_err;
1138
1139 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1140 if (regulator->supply_name == NULL)
1141 goto overflow_err;
1142
1143 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1144 buf);
1145 if (err) {
1146 rdev_warn(rdev, "could not add device link %s err %d\n",
1147 dev->kobj.name, err);
1148
1149 }
1150 } else {
1151 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1152 if (regulator->supply_name == NULL)
1153 goto overflow_err;
1154 }
1155
1156 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1157 rdev->debugfs);
1158 if (!regulator->debugfs) {
1159 rdev_warn(rdev, "Failed to create debugfs directory\n");
1160 } else {
1161 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1162 ®ulator->uA_load);
1163 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1164 ®ulator->min_uV);
1165 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1166 ®ulator->max_uV);
1167 }
1168
1169
1170
1171
1172
1173
1174 if (!_regulator_can_change_status(rdev) &&
1175 _regulator_is_enabled(rdev))
1176 regulator->always_on = true;
1177
1178 mutex_unlock(&rdev->mutex);
1179 return regulator;
1180overflow_err:
1181 list_del(®ulator->list);
1182 kfree(regulator);
1183 mutex_unlock(&rdev->mutex);
1184 return NULL;
1185}
1186
1187static int _regulator_get_enable_time(struct regulator_dev *rdev)
1188{
1189 if (!rdev->desc->ops->enable_time)
1190 return rdev->desc->enable_time;
1191 return rdev->desc->ops->enable_time(rdev);
1192}
1193
1194static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1195 const char *supply,
1196 int *ret)
1197{
1198 struct regulator_dev *r;
1199 struct device_node *node;
1200 struct regulator_map *map;
1201 const char *devname = NULL;
1202
1203
1204 if (dev && dev->of_node) {
1205 node = of_get_regulator(dev, supply);
1206 if (node) {
1207 list_for_each_entry(r, ®ulator_list, list)
1208 if (r->dev.parent &&
1209 node == r->dev.of_node)
1210 return r;
1211 } else {
1212
1213
1214
1215
1216
1217
1218 *ret = -ENODEV;
1219 }
1220 }
1221
1222
1223 if (dev)
1224 devname = dev_name(dev);
1225
1226 list_for_each_entry(r, ®ulator_list, list)
1227 if (strcmp(rdev_get_name(r), supply) == 0)
1228 return r;
1229
1230 list_for_each_entry(map, ®ulator_map_list, list) {
1231
1232 if (map->dev_name &&
1233 (!devname || strcmp(map->dev_name, devname)))
1234 continue;
1235
1236 if (strcmp(map->supply, supply) == 0)
1237 return map->regulator;
1238 }
1239
1240
1241 return NULL;
1242}
1243
1244
1245static struct regulator *_regulator_get(struct device *dev, const char *id,
1246 bool exclusive)
1247{
1248 struct regulator_dev *rdev;
1249 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1250 const char *devname = NULL;
1251 int ret = 0;
1252
1253 if (id == NULL) {
1254 pr_err("get() with no identifier\n");
1255 return regulator;
1256 }
1257
1258 if (dev)
1259 devname = dev_name(dev);
1260
1261 mutex_lock(®ulator_list_mutex);
1262
1263 rdev = regulator_dev_lookup(dev, id, &ret);
1264 if (rdev)
1265 goto found;
1266
1267
1268
1269
1270
1271 if (ret) {
1272 regulator = ERR_PTR(ret);
1273 goto out;
1274 }
1275
1276 if (board_wants_dummy_regulator) {
1277 rdev = dummy_regulator_rdev;
1278 goto found;
1279 }
1280
1281#ifdef CONFIG_REGULATOR_DUMMY
1282 if (!devname)
1283 devname = "deviceless";
1284
1285
1286
1287
1288 if (!has_full_constraints) {
1289 pr_warn("%s supply %s not found, using dummy regulator\n",
1290 devname, id);
1291 rdev = dummy_regulator_rdev;
1292 goto found;
1293 }
1294#endif
1295
1296 mutex_unlock(®ulator_list_mutex);
1297 return regulator;
1298
1299found:
1300 if (rdev->exclusive) {
1301 regulator = ERR_PTR(-EPERM);
1302 goto out;
1303 }
1304
1305 if (exclusive && rdev->open_count) {
1306 regulator = ERR_PTR(-EBUSY);
1307 goto out;
1308 }
1309
1310 if (!try_module_get(rdev->owner))
1311 goto out;
1312
1313 regulator = create_regulator(rdev, dev, id);
1314 if (regulator == NULL) {
1315 regulator = ERR_PTR(-ENOMEM);
1316 module_put(rdev->owner);
1317 goto out;
1318 }
1319
1320 rdev->open_count++;
1321 if (exclusive) {
1322 rdev->exclusive = 1;
1323
1324 ret = _regulator_is_enabled(rdev);
1325 if (ret > 0)
1326 rdev->use_count = 1;
1327 else
1328 rdev->use_count = 0;
1329 }
1330
1331out:
1332 mutex_unlock(®ulator_list_mutex);
1333
1334 return regulator;
1335}
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350struct regulator *regulator_get(struct device *dev, const char *id)
1351{
1352 return _regulator_get(dev, id, false);
1353}
1354EXPORT_SYMBOL_GPL(regulator_get);
1355
1356static void devm_regulator_release(struct device *dev, void *res)
1357{
1358 regulator_put(*(struct regulator **)res);
1359}
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370struct regulator *devm_regulator_get(struct device *dev, const char *id)
1371{
1372 struct regulator **ptr, *regulator;
1373
1374 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1375 if (!ptr)
1376 return ERR_PTR(-ENOMEM);
1377
1378 regulator = regulator_get(dev, id);
1379 if (!IS_ERR(regulator)) {
1380 *ptr = regulator;
1381 devres_add(dev, ptr);
1382 } else {
1383 devres_free(ptr);
1384 }
1385
1386 return regulator;
1387}
1388EXPORT_SYMBOL_GPL(devm_regulator_get);
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1412{
1413 return _regulator_get(dev, id, true);
1414}
1415EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440struct regulator *regulator_get_optional(struct device *dev, const char *id)
1441{
1442 return _regulator_get(dev, id, 0);
1443}
1444EXPORT_SYMBOL_GPL(regulator_get_optional);
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455struct regulator *devm_regulator_get_optional(struct device *dev,
1456 const char *id)
1457{
1458 struct regulator **ptr, *regulator;
1459
1460 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1461 if (!ptr)
1462 return ERR_PTR(-ENOMEM);
1463
1464 regulator = regulator_get_optional(dev, id);
1465 if (!IS_ERR(regulator)) {
1466 *ptr = regulator;
1467 devres_add(dev, ptr);
1468 } else {
1469 devres_free(ptr);
1470 }
1471
1472 return regulator;
1473}
1474EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
1475
1476
1477static void _regulator_put(struct regulator *regulator)
1478{
1479 struct regulator_dev *rdev;
1480
1481 if (regulator == NULL || IS_ERR(regulator))
1482 return;
1483
1484 rdev = regulator->rdev;
1485
1486 debugfs_remove_recursive(regulator->debugfs);
1487
1488
1489 if (regulator->dev)
1490 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1491 kfree(regulator->supply_name);
1492 list_del(®ulator->list);
1493 kfree(regulator);
1494
1495 rdev->open_count--;
1496 rdev->exclusive = 0;
1497
1498 module_put(rdev->owner);
1499}
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510struct regulator *devm_regulator_get_exclusive(struct device *dev,
1511 const char *id)
1512{
1513 struct regulator **ptr, *regulator;
1514
1515 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1516 if (!ptr)
1517 return ERR_PTR(-ENOMEM);
1518
1519 regulator = _regulator_get(dev, id, 1);
1520 if (!IS_ERR(regulator)) {
1521 *ptr = regulator;
1522 devres_add(dev, ptr);
1523 } else {
1524 devres_free(ptr);
1525 }
1526
1527 return regulator;
1528}
1529EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539void regulator_put(struct regulator *regulator)
1540{
1541 mutex_lock(®ulator_list_mutex);
1542 _regulator_put(regulator);
1543 mutex_unlock(®ulator_list_mutex);
1544}
1545EXPORT_SYMBOL_GPL(regulator_put);
1546
1547static int devm_regulator_match(struct device *dev, void *res, void *data)
1548{
1549 struct regulator **r = res;
1550 if (!r || !*r) {
1551 WARN_ON(!r || !*r);
1552 return 0;
1553 }
1554 return *r == data;
1555}
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565void devm_regulator_put(struct regulator *regulator)
1566{
1567 int rc;
1568
1569 rc = devres_release(regulator->dev, devm_regulator_release,
1570 devm_regulator_match, regulator);
1571 if (rc != 0)
1572 WARN_ON(rc);
1573}
1574EXPORT_SYMBOL_GPL(devm_regulator_put);
1575
1576
1577static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1578 const struct regulator_config *config)
1579{
1580 struct regulator_enable_gpio *pin;
1581 int ret;
1582
1583 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1584 if (pin->gpio == config->ena_gpio) {
1585 rdev_dbg(rdev, "GPIO %d is already used\n",
1586 config->ena_gpio);
1587 goto update_ena_gpio_to_rdev;
1588 }
1589 }
1590
1591 ret = gpio_request_one(config->ena_gpio,
1592 GPIOF_DIR_OUT | config->ena_gpio_flags,
1593 rdev_get_name(rdev));
1594 if (ret)
1595 return ret;
1596
1597 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1598 if (pin == NULL) {
1599 gpio_free(config->ena_gpio);
1600 return -ENOMEM;
1601 }
1602
1603 pin->gpio = config->ena_gpio;
1604 pin->ena_gpio_invert = config->ena_gpio_invert;
1605 list_add(&pin->list, ®ulator_ena_gpio_list);
1606
1607update_ena_gpio_to_rdev:
1608 pin->request_count++;
1609 rdev->ena_pin = pin;
1610 return 0;
1611}
1612
1613static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1614{
1615 struct regulator_enable_gpio *pin, *n;
1616
1617 if (!rdev->ena_pin)
1618 return;
1619
1620
1621 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1622 if (pin->gpio == rdev->ena_pin->gpio) {
1623 if (pin->request_count <= 1) {
1624 pin->request_count = 0;
1625 gpio_free(pin->gpio);
1626 list_del(&pin->list);
1627 kfree(pin);
1628 } else {
1629 pin->request_count--;
1630 }
1631 }
1632 }
1633}
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1644{
1645 struct regulator_enable_gpio *pin = rdev->ena_pin;
1646
1647 if (!pin)
1648 return -EINVAL;
1649
1650 if (enable) {
1651
1652 if (pin->enable_count == 0)
1653 gpio_set_value_cansleep(pin->gpio,
1654 !pin->ena_gpio_invert);
1655
1656 pin->enable_count++;
1657 } else {
1658 if (pin->enable_count > 1) {
1659 pin->enable_count--;
1660 return 0;
1661 }
1662
1663
1664 if (pin->enable_count <= 1) {
1665 gpio_set_value_cansleep(pin->gpio,
1666 pin->ena_gpio_invert);
1667 pin->enable_count = 0;
1668 }
1669 }
1670
1671 return 0;
1672}
1673
1674static int _regulator_do_enable(struct regulator_dev *rdev)
1675{
1676 int ret, delay;
1677
1678
1679 ret = _regulator_get_enable_time(rdev);
1680 if (ret >= 0) {
1681 delay = ret;
1682 } else {
1683 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1684 delay = 0;
1685 }
1686
1687 trace_regulator_enable(rdev_get_name(rdev));
1688
1689 if (rdev->ena_pin) {
1690 ret = regulator_ena_gpio_ctrl(rdev, true);
1691 if (ret < 0)
1692 return ret;
1693 rdev->ena_gpio_state = 1;
1694 } else if (rdev->desc->ops->enable) {
1695 ret = rdev->desc->ops->enable(rdev);
1696 if (ret < 0)
1697 return ret;
1698 } else {
1699 return -EINVAL;
1700 }
1701
1702
1703
1704
1705 trace_regulator_enable_delay(rdev_get_name(rdev));
1706
1707 if (delay >= 1000) {
1708 mdelay(delay / 1000);
1709 udelay(delay % 1000);
1710 } else if (delay) {
1711 udelay(delay);
1712 }
1713
1714 trace_regulator_enable_complete(rdev_get_name(rdev));
1715
1716 return 0;
1717}
1718
1719
1720static int _regulator_enable(struct regulator_dev *rdev)
1721{
1722 int ret;
1723
1724
1725 if (rdev->constraints &&
1726 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1727 drms_uA_update(rdev);
1728
1729 if (rdev->use_count == 0) {
1730
1731 ret = _regulator_is_enabled(rdev);
1732 if (ret == -EINVAL || ret == 0) {
1733 if (!_regulator_can_change_status(rdev))
1734 return -EPERM;
1735
1736 ret = _regulator_do_enable(rdev);
1737 if (ret < 0)
1738 return ret;
1739
1740 } else if (ret < 0) {
1741 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1742 return ret;
1743 }
1744
1745 }
1746
1747 rdev->use_count++;
1748
1749 return 0;
1750}
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763int regulator_enable(struct regulator *regulator)
1764{
1765 struct regulator_dev *rdev = regulator->rdev;
1766 int ret = 0;
1767
1768 if (regulator->always_on)
1769 return 0;
1770
1771 if (rdev->supply) {
1772 ret = regulator_enable(rdev->supply);
1773 if (ret != 0)
1774 return ret;
1775 }
1776
1777 mutex_lock(&rdev->mutex);
1778 ret = _regulator_enable(rdev);
1779 mutex_unlock(&rdev->mutex);
1780
1781 if (ret != 0 && rdev->supply)
1782 regulator_disable(rdev->supply);
1783
1784 return ret;
1785}
1786EXPORT_SYMBOL_GPL(regulator_enable);
1787
1788static int _regulator_do_disable(struct regulator_dev *rdev)
1789{
1790 int ret;
1791
1792 trace_regulator_disable(rdev_get_name(rdev));
1793
1794 if (rdev->ena_pin) {
1795 ret = regulator_ena_gpio_ctrl(rdev, false);
1796 if (ret < 0)
1797 return ret;
1798 rdev->ena_gpio_state = 0;
1799
1800 } else if (rdev->desc->ops->disable) {
1801 ret = rdev->desc->ops->disable(rdev);
1802 if (ret != 0)
1803 return ret;
1804 }
1805
1806 trace_regulator_disable_complete(rdev_get_name(rdev));
1807
1808 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1809 NULL);
1810 return 0;
1811}
1812
1813
1814static int _regulator_disable(struct regulator_dev *rdev)
1815{
1816 int ret = 0;
1817
1818 if (WARN(rdev->use_count <= 0,
1819 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1820 return -EIO;
1821
1822
1823 if (rdev->use_count == 1 &&
1824 (rdev->constraints && !rdev->constraints->always_on)) {
1825
1826
1827 if (_regulator_can_change_status(rdev)) {
1828 ret = _regulator_do_disable(rdev);
1829 if (ret < 0) {
1830 rdev_err(rdev, "failed to disable\n");
1831 return ret;
1832 }
1833 }
1834
1835 rdev->use_count = 0;
1836 } else if (rdev->use_count > 1) {
1837
1838 if (rdev->constraints &&
1839 (rdev->constraints->valid_ops_mask &
1840 REGULATOR_CHANGE_DRMS))
1841 drms_uA_update(rdev);
1842
1843 rdev->use_count--;
1844 }
1845
1846 return ret;
1847}
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861int regulator_disable(struct regulator *regulator)
1862{
1863 struct regulator_dev *rdev = regulator->rdev;
1864 int ret = 0;
1865
1866 if (regulator->always_on)
1867 return 0;
1868
1869 mutex_lock(&rdev->mutex);
1870 ret = _regulator_disable(rdev);
1871 mutex_unlock(&rdev->mutex);
1872
1873 if (ret == 0 && rdev->supply)
1874 regulator_disable(rdev->supply);
1875
1876 return ret;
1877}
1878EXPORT_SYMBOL_GPL(regulator_disable);
1879
1880
1881static int _regulator_force_disable(struct regulator_dev *rdev)
1882{
1883 int ret = 0;
1884
1885
1886 if (rdev->desc->ops->disable) {
1887
1888 ret = rdev->desc->ops->disable(rdev);
1889 if (ret < 0) {
1890 rdev_err(rdev, "failed to force disable\n");
1891 return ret;
1892 }
1893
1894 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1895 REGULATOR_EVENT_DISABLE, NULL);
1896 }
1897
1898 return ret;
1899}
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910int regulator_force_disable(struct regulator *regulator)
1911{
1912 struct regulator_dev *rdev = regulator->rdev;
1913 int ret;
1914
1915 mutex_lock(&rdev->mutex);
1916 regulator->uA_load = 0;
1917 ret = _regulator_force_disable(regulator->rdev);
1918 mutex_unlock(&rdev->mutex);
1919
1920 if (rdev->supply)
1921 while (rdev->open_count--)
1922 regulator_disable(rdev->supply);
1923
1924 return ret;
1925}
1926EXPORT_SYMBOL_GPL(regulator_force_disable);
1927
1928static void regulator_disable_work(struct work_struct *work)
1929{
1930 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1931 disable_work.work);
1932 int count, i, ret;
1933
1934 mutex_lock(&rdev->mutex);
1935
1936 BUG_ON(!rdev->deferred_disables);
1937
1938 count = rdev->deferred_disables;
1939 rdev->deferred_disables = 0;
1940
1941 for (i = 0; i < count; i++) {
1942 ret = _regulator_disable(rdev);
1943 if (ret != 0)
1944 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1945 }
1946
1947 mutex_unlock(&rdev->mutex);
1948
1949 if (rdev->supply) {
1950 for (i = 0; i < count; i++) {
1951 ret = regulator_disable(rdev->supply);
1952 if (ret != 0) {
1953 rdev_err(rdev,
1954 "Supply disable failed: %d\n", ret);
1955 }
1956 }
1957 }
1958}
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972int regulator_disable_deferred(struct regulator *regulator, int ms)
1973{
1974 struct regulator_dev *rdev = regulator->rdev;
1975 int ret;
1976
1977 if (regulator->always_on)
1978 return 0;
1979
1980 if (!ms)
1981 return regulator_disable(regulator);
1982
1983 mutex_lock(&rdev->mutex);
1984 rdev->deferred_disables++;
1985 mutex_unlock(&rdev->mutex);
1986
1987 ret = queue_delayed_work(system_power_efficient_wq,
1988 &rdev->disable_work,
1989 msecs_to_jiffies(ms));
1990 if (ret < 0)
1991 return ret;
1992 else
1993 return 0;
1994}
1995EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1996
1997static int _regulator_is_enabled(struct regulator_dev *rdev)
1998{
1999
2000 if (rdev->ena_pin)
2001 return rdev->ena_gpio_state;
2002
2003
2004 if (!rdev->desc->ops->is_enabled)
2005 return 1;
2006
2007 return rdev->desc->ops->is_enabled(rdev);
2008}
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022int regulator_is_enabled(struct regulator *regulator)
2023{
2024 int ret;
2025
2026 if (regulator->always_on)
2027 return 1;
2028
2029 mutex_lock(®ulator->rdev->mutex);
2030 ret = _regulator_is_enabled(regulator->rdev);
2031 mutex_unlock(®ulator->rdev->mutex);
2032
2033 return ret;
2034}
2035EXPORT_SYMBOL_GPL(regulator_is_enabled);
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046int regulator_can_change_voltage(struct regulator *regulator)
2047{
2048 struct regulator_dev *rdev = regulator->rdev;
2049
2050 if (rdev->constraints &&
2051 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2052 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2053 return 1;
2054
2055 if (rdev->desc->continuous_voltage_range &&
2056 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2057 rdev->constraints->min_uV != rdev->constraints->max_uV)
2058 return 1;
2059 }
2060
2061 return 0;
2062}
2063EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073int regulator_count_voltages(struct regulator *regulator)
2074{
2075 struct regulator_dev *rdev = regulator->rdev;
2076
2077 return rdev->desc->n_voltages ? : -EINVAL;
2078}
2079EXPORT_SYMBOL_GPL(regulator_count_voltages);
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2092{
2093 struct regulator_dev *rdev = regulator->rdev;
2094 struct regulator_ops *ops = rdev->desc->ops;
2095 int ret;
2096
2097 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2098 return -EINVAL;
2099
2100 mutex_lock(&rdev->mutex);
2101 ret = ops->list_voltage(rdev, selector);
2102 mutex_unlock(&rdev->mutex);
2103
2104 if (ret > 0) {
2105 if (ret < rdev->constraints->min_uV)
2106 ret = 0;
2107 else if (ret > rdev->constraints->max_uV)
2108 ret = 0;
2109 }
2110
2111 return ret;
2112}
2113EXPORT_SYMBOL_GPL(regulator_list_voltage);
2114
2115
2116
2117
2118
2119
2120
2121
2122unsigned int regulator_get_linear_step(struct regulator *regulator)
2123{
2124 struct regulator_dev *rdev = regulator->rdev;
2125
2126 return rdev->desc->uV_step;
2127}
2128EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139int regulator_is_supported_voltage(struct regulator *regulator,
2140 int min_uV, int max_uV)
2141{
2142 struct regulator_dev *rdev = regulator->rdev;
2143 int i, voltages, ret;
2144
2145
2146 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2147 ret = regulator_get_voltage(regulator);
2148 if (ret >= 0)
2149 return (min_uV <= ret && ret <= max_uV);
2150 else
2151 return ret;
2152 }
2153
2154
2155 if (rdev->desc->continuous_voltage_range)
2156 return min_uV >= rdev->constraints->min_uV &&
2157 max_uV <= rdev->constraints->max_uV;
2158
2159 ret = regulator_count_voltages(regulator);
2160 if (ret < 0)
2161 return ret;
2162 voltages = ret;
2163
2164 for (i = 0; i < voltages; i++) {
2165 ret = regulator_list_voltage(regulator, i);
2166
2167 if (ret >= min_uV && ret <= max_uV)
2168 return 1;
2169 }
2170
2171 return 0;
2172}
2173EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2174
2175static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2176 int min_uV, int max_uV)
2177{
2178 int ret;
2179 int delay = 0;
2180 int best_val = 0;
2181 unsigned int selector;
2182 int old_selector = -1;
2183
2184 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2185
2186 min_uV += rdev->constraints->uV_offset;
2187 max_uV += rdev->constraints->uV_offset;
2188
2189
2190
2191
2192
2193 if (_regulator_is_enabled(rdev) &&
2194 rdev->desc->ops->set_voltage_time_sel &&
2195 rdev->desc->ops->get_voltage_sel) {
2196 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2197 if (old_selector < 0)
2198 return old_selector;
2199 }
2200
2201 if (rdev->desc->ops->set_voltage) {
2202 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2203 &selector);
2204
2205 if (ret >= 0) {
2206 if (rdev->desc->ops->list_voltage)
2207 best_val = rdev->desc->ops->list_voltage(rdev,
2208 selector);
2209 else
2210 best_val = _regulator_get_voltage(rdev);
2211 }
2212
2213 } else if (rdev->desc->ops->set_voltage_sel) {
2214 if (rdev->desc->ops->map_voltage) {
2215 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2216 max_uV);
2217 } else {
2218 if (rdev->desc->ops->list_voltage ==
2219 regulator_list_voltage_linear)
2220 ret = regulator_map_voltage_linear(rdev,
2221 min_uV, max_uV);
2222 else
2223 ret = regulator_map_voltage_iterate(rdev,
2224 min_uV, max_uV);
2225 }
2226
2227 if (ret >= 0) {
2228 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2229 if (min_uV <= best_val && max_uV >= best_val) {
2230 selector = ret;
2231 if (old_selector == selector)
2232 ret = 0;
2233 else
2234 ret = rdev->desc->ops->set_voltage_sel(
2235 rdev, ret);
2236 } else {
2237 ret = -EINVAL;
2238 }
2239 }
2240 } else {
2241 ret = -EINVAL;
2242 }
2243
2244
2245 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2246 && old_selector != selector) {
2247
2248 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2249 old_selector, selector);
2250 if (delay < 0) {
2251 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2252 delay);
2253 delay = 0;
2254 }
2255
2256
2257 if (delay >= 1000) {
2258 mdelay(delay / 1000);
2259 udelay(delay % 1000);
2260 } else if (delay) {
2261 udelay(delay);
2262 }
2263 }
2264
2265 if (ret == 0 && best_val >= 0) {
2266 unsigned long data = best_val;
2267
2268 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2269 (void *)data);
2270 }
2271
2272 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2273
2274 return ret;
2275}
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2296{
2297 struct regulator_dev *rdev = regulator->rdev;
2298 int ret = 0;
2299 int old_min_uV, old_max_uV;
2300
2301 mutex_lock(&rdev->mutex);
2302
2303
2304
2305
2306
2307 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2308 goto out;
2309
2310
2311 if (!rdev->desc->ops->set_voltage &&
2312 !rdev->desc->ops->set_voltage_sel) {
2313 ret = -EINVAL;
2314 goto out;
2315 }
2316
2317
2318 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2319 if (ret < 0)
2320 goto out;
2321
2322
2323 old_min_uV = regulator->min_uV;
2324 old_max_uV = regulator->max_uV;
2325 regulator->min_uV = min_uV;
2326 regulator->max_uV = max_uV;
2327
2328 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2329 if (ret < 0)
2330 goto out2;
2331
2332 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2333 if (ret < 0)
2334 goto out2;
2335
2336out:
2337 mutex_unlock(&rdev->mutex);
2338 return ret;
2339out2:
2340 regulator->min_uV = old_min_uV;
2341 regulator->max_uV = old_max_uV;
2342 mutex_unlock(&rdev->mutex);
2343 return ret;
2344}
2345EXPORT_SYMBOL_GPL(regulator_set_voltage);
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357int regulator_set_voltage_time(struct regulator *regulator,
2358 int old_uV, int new_uV)
2359{
2360 struct regulator_dev *rdev = regulator->rdev;
2361 struct regulator_ops *ops = rdev->desc->ops;
2362 int old_sel = -1;
2363 int new_sel = -1;
2364 int voltage;
2365 int i;
2366
2367
2368 if (!ops->list_voltage || !ops->set_voltage_time_sel
2369 || !rdev->desc->n_voltages)
2370 return -EINVAL;
2371
2372 for (i = 0; i < rdev->desc->n_voltages; i++) {
2373
2374 voltage = regulator_list_voltage(regulator, i);
2375 if (voltage < 0)
2376 return -EINVAL;
2377 if (voltage == 0)
2378 continue;
2379 if (voltage == old_uV)
2380 old_sel = i;
2381 if (voltage == new_uV)
2382 new_sel = i;
2383 }
2384
2385 if (old_sel < 0 || new_sel < 0)
2386 return -EINVAL;
2387
2388 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2389}
2390EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2405 unsigned int old_selector,
2406 unsigned int new_selector)
2407{
2408 unsigned int ramp_delay = 0;
2409 int old_volt, new_volt;
2410
2411 if (rdev->constraints->ramp_delay)
2412 ramp_delay = rdev->constraints->ramp_delay;
2413 else if (rdev->desc->ramp_delay)
2414 ramp_delay = rdev->desc->ramp_delay;
2415
2416 if (ramp_delay == 0) {
2417 rdev_warn(rdev, "ramp_delay not set\n");
2418 return 0;
2419 }
2420
2421
2422 if (!rdev->desc->ops->list_voltage)
2423 return -EINVAL;
2424
2425 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2426 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2427
2428 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2429}
2430EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440int regulator_sync_voltage(struct regulator *regulator)
2441{
2442 struct regulator_dev *rdev = regulator->rdev;
2443 int ret, min_uV, max_uV;
2444
2445 mutex_lock(&rdev->mutex);
2446
2447 if (!rdev->desc->ops->set_voltage &&
2448 !rdev->desc->ops->set_voltage_sel) {
2449 ret = -EINVAL;
2450 goto out;
2451 }
2452
2453
2454 if (!regulator->min_uV && !regulator->max_uV) {
2455 ret = -EINVAL;
2456 goto out;
2457 }
2458
2459 min_uV = regulator->min_uV;
2460 max_uV = regulator->max_uV;
2461
2462
2463 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2464 if (ret < 0)
2465 goto out;
2466
2467 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2468 if (ret < 0)
2469 goto out;
2470
2471 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2472
2473out:
2474 mutex_unlock(&rdev->mutex);
2475 return ret;
2476}
2477EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2478
2479static int _regulator_get_voltage(struct regulator_dev *rdev)
2480{
2481 int sel, ret;
2482
2483 if (rdev->desc->ops->get_voltage_sel) {
2484 sel = rdev->desc->ops->get_voltage_sel(rdev);
2485 if (sel < 0)
2486 return sel;
2487 ret = rdev->desc->ops->list_voltage(rdev, sel);
2488 } else if (rdev->desc->ops->get_voltage) {
2489 ret = rdev->desc->ops->get_voltage(rdev);
2490 } else if (rdev->desc->ops->list_voltage) {
2491 ret = rdev->desc->ops->list_voltage(rdev, 0);
2492 } else {
2493 return -EINVAL;
2494 }
2495
2496 if (ret < 0)
2497 return ret;
2498 return ret - rdev->constraints->uV_offset;
2499}
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510int regulator_get_voltage(struct regulator *regulator)
2511{
2512 int ret;
2513
2514 mutex_lock(®ulator->rdev->mutex);
2515
2516 ret = _regulator_get_voltage(regulator->rdev);
2517
2518 mutex_unlock(®ulator->rdev->mutex);
2519
2520 return ret;
2521}
2522EXPORT_SYMBOL_GPL(regulator_get_voltage);
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540int regulator_set_current_limit(struct regulator *regulator,
2541 int min_uA, int max_uA)
2542{
2543 struct regulator_dev *rdev = regulator->rdev;
2544 int ret;
2545
2546 mutex_lock(&rdev->mutex);
2547
2548
2549 if (!rdev->desc->ops->set_current_limit) {
2550 ret = -EINVAL;
2551 goto out;
2552 }
2553
2554
2555 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2556 if (ret < 0)
2557 goto out;
2558
2559 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2560out:
2561 mutex_unlock(&rdev->mutex);
2562 return ret;
2563}
2564EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2565
2566static int _regulator_get_current_limit(struct regulator_dev *rdev)
2567{
2568 int ret;
2569
2570 mutex_lock(&rdev->mutex);
2571
2572
2573 if (!rdev->desc->ops->get_current_limit) {
2574 ret = -EINVAL;
2575 goto out;
2576 }
2577
2578 ret = rdev->desc->ops->get_current_limit(rdev);
2579out:
2580 mutex_unlock(&rdev->mutex);
2581 return ret;
2582}
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593int regulator_get_current_limit(struct regulator *regulator)
2594{
2595 return _regulator_get_current_limit(regulator->rdev);
2596}
2597EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2611{
2612 struct regulator_dev *rdev = regulator->rdev;
2613 int ret;
2614 int regulator_curr_mode;
2615
2616 mutex_lock(&rdev->mutex);
2617
2618
2619 if (!rdev->desc->ops->set_mode) {
2620 ret = -EINVAL;
2621 goto out;
2622 }
2623
2624
2625 if (rdev->desc->ops->get_mode) {
2626 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2627 if (regulator_curr_mode == mode) {
2628 ret = 0;
2629 goto out;
2630 }
2631 }
2632
2633
2634 ret = regulator_mode_constrain(rdev, &mode);
2635 if (ret < 0)
2636 goto out;
2637
2638 ret = rdev->desc->ops->set_mode(rdev, mode);
2639out:
2640 mutex_unlock(&rdev->mutex);
2641 return ret;
2642}
2643EXPORT_SYMBOL_GPL(regulator_set_mode);
2644
2645static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2646{
2647 int ret;
2648
2649 mutex_lock(&rdev->mutex);
2650
2651
2652 if (!rdev->desc->ops->get_mode) {
2653 ret = -EINVAL;
2654 goto out;
2655 }
2656
2657 ret = rdev->desc->ops->get_mode(rdev);
2658out:
2659 mutex_unlock(&rdev->mutex);
2660 return ret;
2661}
2662
2663
2664
2665
2666
2667
2668
2669unsigned int regulator_get_mode(struct regulator *regulator)
2670{
2671 return _regulator_get_mode(regulator->rdev);
2672}
2673EXPORT_SYMBOL_GPL(regulator_get_mode);
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2702{
2703 struct regulator_dev *rdev = regulator->rdev;
2704 struct regulator *consumer;
2705 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2706 unsigned int mode;
2707
2708 if (rdev->supply)
2709 input_uV = regulator_get_voltage(rdev->supply);
2710
2711 mutex_lock(&rdev->mutex);
2712
2713
2714
2715
2716
2717 regulator->uA_load = uA_load;
2718 ret = regulator_check_drms(rdev);
2719 if (ret < 0) {
2720 ret = 0;
2721 goto out;
2722 }
2723
2724 if (!rdev->desc->ops->get_optimum_mode)
2725 goto out;
2726
2727
2728
2729
2730
2731 ret = -EINVAL;
2732
2733 if (!rdev->desc->ops->set_mode)
2734 goto out;
2735
2736
2737 output_uV = _regulator_get_voltage(rdev);
2738 if (output_uV <= 0) {
2739 rdev_err(rdev, "invalid output voltage found\n");
2740 goto out;
2741 }
2742
2743
2744 if (input_uV <= 0)
2745 input_uV = rdev->constraints->input_uV;
2746 if (input_uV <= 0) {
2747 rdev_err(rdev, "invalid input voltage found\n");
2748 goto out;
2749 }
2750
2751
2752 list_for_each_entry(consumer, &rdev->consumer_list, list)
2753 total_uA_load += consumer->uA_load;
2754
2755 mode = rdev->desc->ops->get_optimum_mode(rdev,
2756 input_uV, output_uV,
2757 total_uA_load);
2758 ret = regulator_mode_constrain(rdev, &mode);
2759 if (ret < 0) {
2760 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2761 total_uA_load, input_uV, output_uV);
2762 goto out;
2763 }
2764
2765 ret = rdev->desc->ops->set_mode(rdev, mode);
2766 if (ret < 0) {
2767 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2768 goto out;
2769 }
2770 ret = mode;
2771out:
2772 mutex_unlock(&rdev->mutex);
2773 return ret;
2774}
2775EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788int regulator_allow_bypass(struct regulator *regulator, bool enable)
2789{
2790 struct regulator_dev *rdev = regulator->rdev;
2791 int ret = 0;
2792
2793 if (!rdev->desc->ops->set_bypass)
2794 return 0;
2795
2796 if (rdev->constraints &&
2797 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2798 return 0;
2799
2800 mutex_lock(&rdev->mutex);
2801
2802 if (enable && !regulator->bypass) {
2803 rdev->bypass_count++;
2804
2805 if (rdev->bypass_count == rdev->open_count) {
2806 ret = rdev->desc->ops->set_bypass(rdev, enable);
2807 if (ret != 0)
2808 rdev->bypass_count--;
2809 }
2810
2811 } else if (!enable && regulator->bypass) {
2812 rdev->bypass_count--;
2813
2814 if (rdev->bypass_count != rdev->open_count) {
2815 ret = rdev->desc->ops->set_bypass(rdev, enable);
2816 if (ret != 0)
2817 rdev->bypass_count++;
2818 }
2819 }
2820
2821 if (ret == 0)
2822 regulator->bypass = enable;
2823
2824 mutex_unlock(&rdev->mutex);
2825
2826 return ret;
2827}
2828EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2829
2830
2831
2832
2833
2834
2835
2836
2837int regulator_register_notifier(struct regulator *regulator,
2838 struct notifier_block *nb)
2839{
2840 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2841 nb);
2842}
2843EXPORT_SYMBOL_GPL(regulator_register_notifier);
2844
2845
2846
2847
2848
2849
2850
2851
2852int regulator_unregister_notifier(struct regulator *regulator,
2853 struct notifier_block *nb)
2854{
2855 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2856 nb);
2857}
2858EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2859
2860
2861
2862
2863static void _notifier_call_chain(struct regulator_dev *rdev,
2864 unsigned long event, void *data)
2865{
2866
2867 blocking_notifier_call_chain(&rdev->notifier, event, data);
2868}
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884int regulator_bulk_get(struct device *dev, int num_consumers,
2885 struct regulator_bulk_data *consumers)
2886{
2887 int i;
2888 int ret;
2889
2890 for (i = 0; i < num_consumers; i++)
2891 consumers[i].consumer = NULL;
2892
2893 for (i = 0; i < num_consumers; i++) {
2894 consumers[i].consumer = regulator_get(dev,
2895 consumers[i].supply);
2896 if (IS_ERR(consumers[i].consumer)) {
2897 ret = PTR_ERR(consumers[i].consumer);
2898 dev_err(dev, "Failed to get supply '%s': %d\n",
2899 consumers[i].supply, ret);
2900 consumers[i].consumer = NULL;
2901 goto err;
2902 }
2903 }
2904
2905 return 0;
2906
2907err:
2908 while (--i >= 0)
2909 regulator_put(consumers[i].consumer);
2910
2911 return ret;
2912}
2913EXPORT_SYMBOL_GPL(regulator_bulk_get);
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2931 struct regulator_bulk_data *consumers)
2932{
2933 int i;
2934 int ret;
2935
2936 for (i = 0; i < num_consumers; i++)
2937 consumers[i].consumer = NULL;
2938
2939 for (i = 0; i < num_consumers; i++) {
2940 consumers[i].consumer = devm_regulator_get(dev,
2941 consumers[i].supply);
2942 if (IS_ERR(consumers[i].consumer)) {
2943 ret = PTR_ERR(consumers[i].consumer);
2944 dev_err(dev, "Failed to get supply '%s': %d\n",
2945 consumers[i].supply, ret);
2946 consumers[i].consumer = NULL;
2947 goto err;
2948 }
2949 }
2950
2951 return 0;
2952
2953err:
2954 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2955 devm_regulator_put(consumers[i].consumer);
2956
2957 return ret;
2958}
2959EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2960
2961static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2962{
2963 struct regulator_bulk_data *bulk = data;
2964
2965 bulk->ret = regulator_enable(bulk->consumer);
2966}
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980int regulator_bulk_enable(int num_consumers,
2981 struct regulator_bulk_data *consumers)
2982{
2983 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
2984 int i;
2985 int ret = 0;
2986
2987 for (i = 0; i < num_consumers; i++) {
2988 if (consumers[i].consumer->always_on)
2989 consumers[i].ret = 0;
2990 else
2991 async_schedule_domain(regulator_bulk_enable_async,
2992 &consumers[i], &async_domain);
2993 }
2994
2995 async_synchronize_full_domain(&async_domain);
2996
2997
2998 for (i = 0; i < num_consumers; i++) {
2999 if (consumers[i].ret != 0) {
3000 ret = consumers[i].ret;
3001 goto err;
3002 }
3003 }
3004
3005 return 0;
3006
3007err:
3008 for (i = 0; i < num_consumers; i++) {
3009 if (consumers[i].ret < 0)
3010 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3011 consumers[i].ret);
3012 else
3013 regulator_disable(consumers[i].consumer);
3014 }
3015
3016 return ret;
3017}
3018EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032int regulator_bulk_disable(int num_consumers,
3033 struct regulator_bulk_data *consumers)
3034{
3035 int i;
3036 int ret, r;
3037
3038 for (i = num_consumers - 1; i >= 0; --i) {
3039 ret = regulator_disable(consumers[i].consumer);
3040 if (ret != 0)
3041 goto err;
3042 }
3043
3044 return 0;
3045
3046err:
3047 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3048 for (++i; i < num_consumers; ++i) {
3049 r = regulator_enable(consumers[i].consumer);
3050 if (r != 0)
3051 pr_err("Failed to reename %s: %d\n",
3052 consumers[i].supply, r);
3053 }
3054
3055 return ret;
3056}
3057EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073int regulator_bulk_force_disable(int num_consumers,
3074 struct regulator_bulk_data *consumers)
3075{
3076 int i;
3077 int ret;
3078
3079 for (i = 0; i < num_consumers; i++)
3080 consumers[i].ret =
3081 regulator_force_disable(consumers[i].consumer);
3082
3083 for (i = 0; i < num_consumers; i++) {
3084 if (consumers[i].ret != 0) {
3085 ret = consumers[i].ret;
3086 goto out;
3087 }
3088 }
3089
3090 return 0;
3091out:
3092 return ret;
3093}
3094EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105void regulator_bulk_free(int num_consumers,
3106 struct regulator_bulk_data *consumers)
3107{
3108 int i;
3109
3110 for (i = 0; i < num_consumers; i++) {
3111 regulator_put(consumers[i].consumer);
3112 consumers[i].consumer = NULL;
3113 }
3114}
3115EXPORT_SYMBOL_GPL(regulator_bulk_free);
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127int regulator_notifier_call_chain(struct regulator_dev *rdev,
3128 unsigned long event, void *data)
3129{
3130 _notifier_call_chain(rdev, event, data);
3131 return NOTIFY_DONE;
3132
3133}
3134EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3135
3136
3137
3138
3139
3140
3141
3142
3143int regulator_mode_to_status(unsigned int mode)
3144{
3145 switch (mode) {
3146 case REGULATOR_MODE_FAST:
3147 return REGULATOR_STATUS_FAST;
3148 case REGULATOR_MODE_NORMAL:
3149 return REGULATOR_STATUS_NORMAL;
3150 case REGULATOR_MODE_IDLE:
3151 return REGULATOR_STATUS_IDLE;
3152 case REGULATOR_MODE_STANDBY:
3153 return REGULATOR_STATUS_STANDBY;
3154 default:
3155 return REGULATOR_STATUS_UNDEFINED;
3156 }
3157}
3158EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3159
3160
3161
3162
3163
3164static int add_regulator_attributes(struct regulator_dev *rdev)
3165{
3166 struct device *dev = &rdev->dev;
3167 struct regulator_ops *ops = rdev->desc->ops;
3168 int status = 0;
3169
3170
3171 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3172 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3173 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3174 status = device_create_file(dev, &dev_attr_microvolts);
3175 if (status < 0)
3176 return status;
3177 }
3178 if (ops->get_current_limit) {
3179 status = device_create_file(dev, &dev_attr_microamps);
3180 if (status < 0)
3181 return status;
3182 }
3183 if (ops->get_mode) {
3184 status = device_create_file(dev, &dev_attr_opmode);
3185 if (status < 0)
3186 return status;
3187 }
3188 if (rdev->ena_pin || ops->is_enabled) {
3189 status = device_create_file(dev, &dev_attr_state);
3190 if (status < 0)
3191 return status;
3192 }
3193 if (ops->get_status) {
3194 status = device_create_file(dev, &dev_attr_status);
3195 if (status < 0)
3196 return status;
3197 }
3198 if (ops->get_bypass) {
3199 status = device_create_file(dev, &dev_attr_bypass);
3200 if (status < 0)
3201 return status;
3202 }
3203
3204
3205 if (rdev->desc->type == REGULATOR_CURRENT) {
3206 status = device_create_file(dev, &dev_attr_requested_microamps);
3207 if (status < 0)
3208 return status;
3209 }
3210
3211
3212
3213
3214
3215 if (!rdev->constraints)
3216 return status;
3217
3218
3219 if (ops->set_voltage || ops->set_voltage_sel) {
3220 status = device_create_file(dev, &dev_attr_min_microvolts);
3221 if (status < 0)
3222 return status;
3223 status = device_create_file(dev, &dev_attr_max_microvolts);
3224 if (status < 0)
3225 return status;
3226 }
3227 if (ops->set_current_limit) {
3228 status = device_create_file(dev, &dev_attr_min_microamps);
3229 if (status < 0)
3230 return status;
3231 status = device_create_file(dev, &dev_attr_max_microamps);
3232 if (status < 0)
3233 return status;
3234 }
3235
3236 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3237 if (status < 0)
3238 return status;
3239 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3240 if (status < 0)
3241 return status;
3242 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3243 if (status < 0)
3244 return status;
3245
3246 if (ops->set_suspend_voltage) {
3247 status = device_create_file(dev,
3248 &dev_attr_suspend_standby_microvolts);
3249 if (status < 0)
3250 return status;
3251 status = device_create_file(dev,
3252 &dev_attr_suspend_mem_microvolts);
3253 if (status < 0)
3254 return status;
3255 status = device_create_file(dev,
3256 &dev_attr_suspend_disk_microvolts);
3257 if (status < 0)
3258 return status;
3259 }
3260
3261 if (ops->set_suspend_mode) {
3262 status = device_create_file(dev,
3263 &dev_attr_suspend_standby_mode);
3264 if (status < 0)
3265 return status;
3266 status = device_create_file(dev,
3267 &dev_attr_suspend_mem_mode);
3268 if (status < 0)
3269 return status;
3270 status = device_create_file(dev,
3271 &dev_attr_suspend_disk_mode);
3272 if (status < 0)
3273 return status;
3274 }
3275
3276 return status;
3277}
3278
3279static void rdev_init_debugfs(struct regulator_dev *rdev)
3280{
3281 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3282 if (!rdev->debugfs) {
3283 rdev_warn(rdev, "Failed to create debugfs directory\n");
3284 return;
3285 }
3286
3287 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3288 &rdev->use_count);
3289 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3290 &rdev->open_count);
3291 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3292 &rdev->bypass_count);
3293}
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304struct regulator_dev *
3305regulator_register(const struct regulator_desc *regulator_desc,
3306 const struct regulator_config *config)
3307{
3308 const struct regulation_constraints *constraints = NULL;
3309 const struct regulator_init_data *init_data;
3310 static atomic_t regulator_no = ATOMIC_INIT(0);
3311 struct regulator_dev *rdev;
3312 struct device *dev;
3313 int ret, i;
3314 const char *supply = NULL;
3315
3316 if (regulator_desc == NULL || config == NULL)
3317 return ERR_PTR(-EINVAL);
3318
3319 dev = config->dev;
3320 WARN_ON(!dev);
3321
3322 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3323 return ERR_PTR(-EINVAL);
3324
3325 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3326 regulator_desc->type != REGULATOR_CURRENT)
3327 return ERR_PTR(-EINVAL);
3328
3329
3330 WARN_ON(regulator_desc->ops->get_voltage &&
3331 regulator_desc->ops->get_voltage_sel);
3332 WARN_ON(regulator_desc->ops->set_voltage &&
3333 regulator_desc->ops->set_voltage_sel);
3334
3335
3336 if (regulator_desc->ops->get_voltage_sel &&
3337 !regulator_desc->ops->list_voltage) {
3338 return ERR_PTR(-EINVAL);
3339 }
3340 if (regulator_desc->ops->set_voltage_sel &&
3341 !regulator_desc->ops->list_voltage) {
3342 return ERR_PTR(-EINVAL);
3343 }
3344
3345 init_data = config->init_data;
3346
3347 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3348 if (rdev == NULL)
3349 return ERR_PTR(-ENOMEM);
3350
3351 mutex_lock(®ulator_list_mutex);
3352
3353 mutex_init(&rdev->mutex);
3354 rdev->reg_data = config->driver_data;
3355 rdev->owner = regulator_desc->owner;
3356 rdev->desc = regulator_desc;
3357 if (config->regmap)
3358 rdev->regmap = config->regmap;
3359 else if (dev_get_regmap(dev, NULL))
3360 rdev->regmap = dev_get_regmap(dev, NULL);
3361 else if (dev->parent)
3362 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3363 INIT_LIST_HEAD(&rdev->consumer_list);
3364 INIT_LIST_HEAD(&rdev->list);
3365 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3366 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3367
3368
3369 if (init_data && init_data->regulator_init) {
3370 ret = init_data->regulator_init(rdev->reg_data);
3371 if (ret < 0)
3372 goto clean;
3373 }
3374
3375
3376 rdev->dev.class = ®ulator_class;
3377 rdev->dev.of_node = config->of_node;
3378 rdev->dev.parent = dev;
3379 dev_set_name(&rdev->dev, "regulator.%d",
3380 atomic_inc_return(®ulator_no) - 1);
3381 ret = device_register(&rdev->dev);
3382 if (ret != 0) {
3383 put_device(&rdev->dev);
3384 goto clean;
3385 }
3386
3387 dev_set_drvdata(&rdev->dev, rdev);
3388
3389 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3390 ret = regulator_ena_gpio_request(rdev, config);
3391 if (ret != 0) {
3392 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3393 config->ena_gpio, ret);
3394 goto wash;
3395 }
3396
3397 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3398 rdev->ena_gpio_state = 1;
3399
3400 if (config->ena_gpio_invert)
3401 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3402 }
3403
3404
3405 if (init_data)
3406 constraints = &init_data->constraints;
3407
3408 ret = set_machine_constraints(rdev, constraints);
3409 if (ret < 0)
3410 goto scrub;
3411
3412
3413 ret = add_regulator_attributes(rdev);
3414 if (ret < 0)
3415 goto scrub;
3416
3417 if (init_data && init_data->supply_regulator)
3418 supply = init_data->supply_regulator;
3419 else if (regulator_desc->supply_name)
3420 supply = regulator_desc->supply_name;
3421
3422 if (supply) {
3423 struct regulator_dev *r;
3424
3425 r = regulator_dev_lookup(dev, supply, &ret);
3426
3427 if (ret == -ENODEV) {
3428
3429
3430
3431
3432 ret = 0;
3433 goto add_dev;
3434 } else if (!r) {
3435 dev_err(dev, "Failed to find supply %s\n", supply);
3436 ret = -EPROBE_DEFER;
3437 goto scrub;
3438 }
3439
3440 ret = set_supply(rdev, r);
3441 if (ret < 0)
3442 goto scrub;
3443
3444
3445 if (_regulator_is_enabled(rdev)) {
3446 ret = regulator_enable(rdev->supply);
3447 if (ret < 0)
3448 goto scrub;
3449 }
3450 }
3451
3452add_dev:
3453
3454 if (init_data) {
3455 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3456 ret = set_consumer_device_supply(rdev,
3457 init_data->consumer_supplies[i].dev_name,
3458 init_data->consumer_supplies[i].supply);
3459 if (ret < 0) {
3460 dev_err(dev, "Failed to set supply %s\n",
3461 init_data->consumer_supplies[i].supply);
3462 goto unset_supplies;
3463 }
3464 }
3465 }
3466
3467 list_add(&rdev->list, ®ulator_list);
3468
3469 rdev_init_debugfs(rdev);
3470out:
3471 mutex_unlock(®ulator_list_mutex);
3472 return rdev;
3473
3474unset_supplies:
3475 unset_regulator_supplies(rdev);
3476
3477scrub:
3478 if (rdev->supply)
3479 _regulator_put(rdev->supply);
3480 regulator_ena_gpio_free(rdev);
3481 kfree(rdev->constraints);
3482wash:
3483 device_unregister(&rdev->dev);
3484
3485 rdev = ERR_PTR(ret);
3486 goto out;
3487
3488clean:
3489 kfree(rdev);
3490 rdev = ERR_PTR(ret);
3491 goto out;
3492}
3493EXPORT_SYMBOL_GPL(regulator_register);
3494
3495
3496
3497
3498
3499
3500
3501void regulator_unregister(struct regulator_dev *rdev)
3502{
3503 if (rdev == NULL)
3504 return;
3505
3506 if (rdev->supply) {
3507 while (rdev->use_count--)
3508 regulator_disable(rdev->supply);
3509 regulator_put(rdev->supply);
3510 }
3511 mutex_lock(®ulator_list_mutex);
3512 debugfs_remove_recursive(rdev->debugfs);
3513 flush_work(&rdev->disable_work.work);
3514 WARN_ON(rdev->open_count);
3515 unset_regulator_supplies(rdev);
3516 list_del(&rdev->list);
3517 kfree(rdev->constraints);
3518 regulator_ena_gpio_free(rdev);
3519 device_unregister(&rdev->dev);
3520 mutex_unlock(®ulator_list_mutex);
3521}
3522EXPORT_SYMBOL_GPL(regulator_unregister);
3523
3524
3525
3526
3527
3528
3529
3530
3531int regulator_suspend_prepare(suspend_state_t state)
3532{
3533 struct regulator_dev *rdev;
3534 int ret = 0;
3535
3536
3537 if (state == PM_SUSPEND_ON)
3538 return -EINVAL;
3539
3540 mutex_lock(®ulator_list_mutex);
3541 list_for_each_entry(rdev, ®ulator_list, list) {
3542
3543 mutex_lock(&rdev->mutex);
3544 ret = suspend_prepare(rdev, state);
3545 mutex_unlock(&rdev->mutex);
3546
3547 if (ret < 0) {
3548 rdev_err(rdev, "failed to prepare\n");
3549 goto out;
3550 }
3551 }
3552out:
3553 mutex_unlock(®ulator_list_mutex);
3554 return ret;
3555}
3556EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3557
3558
3559
3560
3561
3562
3563
3564int regulator_suspend_finish(void)
3565{
3566 struct regulator_dev *rdev;
3567 int ret = 0, error;
3568
3569 mutex_lock(®ulator_list_mutex);
3570 list_for_each_entry(rdev, ®ulator_list, list) {
3571 struct regulator_ops *ops = rdev->desc->ops;
3572
3573 mutex_lock(&rdev->mutex);
3574 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3575 ops->enable) {
3576 error = ops->enable(rdev);
3577 if (error)
3578 ret = error;
3579 } else {
3580 if (!has_full_constraints)
3581 goto unlock;
3582 if (!ops->disable)
3583 goto unlock;
3584 if (!_regulator_is_enabled(rdev))
3585 goto unlock;
3586
3587 error = ops->disable(rdev);
3588 if (error)
3589 ret = error;
3590 }
3591unlock:
3592 mutex_unlock(&rdev->mutex);
3593 }
3594 mutex_unlock(®ulator_list_mutex);
3595 return ret;
3596}
3597EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610void regulator_has_full_constraints(void)
3611{
3612 has_full_constraints = 1;
3613}
3614EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626void regulator_use_dummy_regulator(void)
3627{
3628 board_wants_dummy_regulator = true;
3629}
3630EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3631
3632
3633
3634
3635
3636
3637
3638
3639void *rdev_get_drvdata(struct regulator_dev *rdev)
3640{
3641 return rdev->reg_data;
3642}
3643EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3644
3645
3646
3647
3648
3649
3650
3651
3652void *regulator_get_drvdata(struct regulator *regulator)
3653{
3654 return regulator->rdev->reg_data;
3655}
3656EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3657
3658
3659
3660
3661
3662
3663void regulator_set_drvdata(struct regulator *regulator, void *data)
3664{
3665 regulator->rdev->reg_data = data;
3666}
3667EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3668
3669
3670
3671
3672
3673int rdev_get_id(struct regulator_dev *rdev)
3674{
3675 return rdev->desc->id;
3676}
3677EXPORT_SYMBOL_GPL(rdev_get_id);
3678
3679struct device *rdev_get_dev(struct regulator_dev *rdev)
3680{
3681 return &rdev->dev;
3682}
3683EXPORT_SYMBOL_GPL(rdev_get_dev);
3684
3685void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3686{
3687 return reg_init_data->driver_data;
3688}
3689EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3690
3691#ifdef CONFIG_DEBUG_FS
3692static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3693 size_t count, loff_t *ppos)
3694{
3695 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3696 ssize_t len, ret = 0;
3697 struct regulator_map *map;
3698
3699 if (!buf)
3700 return -ENOMEM;
3701
3702 list_for_each_entry(map, ®ulator_map_list, list) {
3703 len = snprintf(buf + ret, PAGE_SIZE - ret,
3704 "%s -> %s.%s\n",
3705 rdev_get_name(map->regulator), map->dev_name,
3706 map->supply);
3707 if (len >= 0)
3708 ret += len;
3709 if (ret > PAGE_SIZE) {
3710 ret = PAGE_SIZE;
3711 break;
3712 }
3713 }
3714
3715 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3716
3717 kfree(buf);
3718
3719 return ret;
3720}
3721#endif
3722
3723static const struct file_operations supply_map_fops = {
3724#ifdef CONFIG_DEBUG_FS
3725 .read = supply_map_read_file,
3726 .llseek = default_llseek,
3727#endif
3728};
3729
3730static int __init regulator_init(void)
3731{
3732 int ret;
3733
3734 ret = class_register(®ulator_class);
3735
3736 debugfs_root = debugfs_create_dir("regulator", NULL);
3737 if (!debugfs_root)
3738 pr_warn("regulator: Failed to create debugfs directory\n");
3739
3740 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3741 &supply_map_fops);
3742
3743 regulator_dummy_init();
3744
3745 return ret;
3746}
3747
3748
3749core_initcall(regulator_init);
3750
3751static int __init regulator_init_complete(void)
3752{
3753 struct regulator_dev *rdev;
3754 struct regulator_ops *ops;
3755 struct regulation_constraints *c;
3756 int enabled, ret;
3757
3758
3759
3760
3761
3762
3763
3764 if (of_have_populated_dt())
3765 has_full_constraints = true;
3766
3767 mutex_lock(®ulator_list_mutex);
3768
3769
3770
3771
3772
3773 list_for_each_entry(rdev, ®ulator_list, list) {
3774 ops = rdev->desc->ops;
3775 c = rdev->constraints;
3776
3777 if (!ops->disable || (c && c->always_on))
3778 continue;
3779
3780 mutex_lock(&rdev->mutex);
3781
3782 if (rdev->use_count)
3783 goto unlock;
3784
3785
3786 if (ops->is_enabled)
3787 enabled = ops->is_enabled(rdev);
3788 else
3789 enabled = 1;
3790
3791 if (!enabled)
3792 goto unlock;
3793
3794 if (has_full_constraints) {
3795
3796
3797 rdev_info(rdev, "disabling\n");
3798 ret = ops->disable(rdev);
3799 if (ret != 0) {
3800 rdev_err(rdev, "couldn't disable: %d\n", ret);
3801 }
3802 } else {
3803
3804
3805
3806
3807
3808 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3809 }
3810
3811unlock:
3812 mutex_unlock(&rdev->mutex);
3813 }
3814
3815 mutex_unlock(®ulator_list_mutex);
3816
3817 return 0;
3818}
3819late_initcall(regulator_init_complete);
3820