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