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regulator: core: Fix size limit of supply_map
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1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
6 *
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/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/gpio/consumer.h>
28#include <linux/of.h>
29#include <linux/regmap.h>
30#include <linux/regulator/of_regulator.h>
31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
34#include <linux/module.h>
35
36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
39#include "dummy.h"
40#include "internal.h"
41
42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
53static DEFINE_MUTEX(regulator_list_mutex);
54static LIST_HEAD(regulator_map_list);
55static LIST_HEAD(regulator_ena_gpio_list);
56static LIST_HEAD(regulator_supply_alias_list);
57static bool has_full_constraints;
58
59static struct dentry *debugfs_root;
60
61static struct class regulator_class;
62
63/*
64 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
71 const char *supply;
72 struct regulator_dev *regulator;
73};
74
75/*
76 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
82 struct gpio_desc *gpiod;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
88/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
101static int _regulator_is_enabled(struct regulator_dev *rdev);
102static int _regulator_disable(struct regulator_dev *rdev);
103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
106static int _notifier_call_chain(struct regulator_dev *rdev,
107 unsigned long event, void *data);
108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
113static void _regulator_put(struct regulator *regulator);
114
115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
119
120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
130static bool have_full_constraints(void)
131{
132 return has_full_constraints || of_have_populated_dt();
133}
134
135static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
136{
137 if (!rdev->constraints) {
138 rdev_err(rdev, "no constraints\n");
139 return false;
140 }
141
142 if (rdev->constraints->valid_ops_mask & ops)
143 return true;
144
145 return false;
146}
147
148static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
149{
150 if (rdev && rdev->supply)
151 return rdev->supply->rdev;
152
153 return NULL;
154}
155
156/**
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
159 */
160static void regulator_lock_supply(struct regulator_dev *rdev)
161{
162 int i;
163
164 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
165 mutex_lock_nested(&rdev->mutex, i);
166}
167
168/**
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
171 */
172static void regulator_unlock_supply(struct regulator_dev *rdev)
173{
174 struct regulator *supply;
175
176 while (1) {
177 mutex_unlock(&rdev->mutex);
178 supply = rdev->supply;
179
180 if (!rdev->supply)
181 return;
182
183 rdev = supply->rdev;
184 }
185}
186
187/**
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
191 *
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
194 * returns NULL.
195 */
196static struct device_node *of_get_regulator(struct device *dev, const char *supply)
197{
198 struct device_node *regnode = NULL;
199 char prop_name[32]; /* 32 is max size of property name */
200
201 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
202
203 snprintf(prop_name, 32, "%s-supply", supply);
204 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
205
206 if (!regnode) {
207 dev_dbg(dev, "Looking up %s property in node %s failed\n",
208 prop_name, dev->of_node->full_name);
209 return NULL;
210 }
211 return regnode;
212}
213
214/* Platform voltage constraint check */
215static int regulator_check_voltage(struct regulator_dev *rdev,
216 int *min_uV, int *max_uV)
217{
218 BUG_ON(*min_uV > *max_uV);
219
220 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
221 rdev_err(rdev, "voltage operation not allowed\n");
222 return -EPERM;
223 }
224
225 if (*max_uV > rdev->constraints->max_uV)
226 *max_uV = rdev->constraints->max_uV;
227 if (*min_uV < rdev->constraints->min_uV)
228 *min_uV = rdev->constraints->min_uV;
229
230 if (*min_uV > *max_uV) {
231 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
232 *min_uV, *max_uV);
233 return -EINVAL;
234 }
235
236 return 0;
237}
238
239/* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
241 */
242static int regulator_check_consumers(struct regulator_dev *rdev,
243 int *min_uV, int *max_uV)
244{
245 struct regulator *regulator;
246
247 list_for_each_entry(regulator, &rdev->consumer_list, list) {
248 /*
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
251 */
252 if (!regulator->min_uV && !regulator->max_uV)
253 continue;
254
255 if (*max_uV > regulator->max_uV)
256 *max_uV = regulator->max_uV;
257 if (*min_uV < regulator->min_uV)
258 *min_uV = regulator->min_uV;
259 }
260
261 if (*min_uV > *max_uV) {
262 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
263 *min_uV, *max_uV);
264 return -EINVAL;
265 }
266
267 return 0;
268}
269
270/* current constraint check */
271static int regulator_check_current_limit(struct regulator_dev *rdev,
272 int *min_uA, int *max_uA)
273{
274 BUG_ON(*min_uA > *max_uA);
275
276 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
277 rdev_err(rdev, "current operation not allowed\n");
278 return -EPERM;
279 }
280
281 if (*max_uA > rdev->constraints->max_uA)
282 *max_uA = rdev->constraints->max_uA;
283 if (*min_uA < rdev->constraints->min_uA)
284 *min_uA = rdev->constraints->min_uA;
285
286 if (*min_uA > *max_uA) {
287 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
288 *min_uA, *max_uA);
289 return -EINVAL;
290 }
291
292 return 0;
293}
294
295/* operating mode constraint check */
296static int regulator_mode_constrain(struct regulator_dev *rdev,
297 unsigned int *mode)
298{
299 switch (*mode) {
300 case REGULATOR_MODE_FAST:
301 case REGULATOR_MODE_NORMAL:
302 case REGULATOR_MODE_IDLE:
303 case REGULATOR_MODE_STANDBY:
304 break;
305 default:
306 rdev_err(rdev, "invalid mode %x specified\n", *mode);
307 return -EINVAL;
308 }
309
310 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
311 rdev_err(rdev, "mode operation not allowed\n");
312 return -EPERM;
313 }
314
315 /* The modes are bitmasks, the most power hungry modes having
316 * the lowest values. If the requested mode isn't supported
317 * try higher modes. */
318 while (*mode) {
319 if (rdev->constraints->valid_modes_mask & *mode)
320 return 0;
321 *mode /= 2;
322 }
323
324 return -EINVAL;
325}
326
327static ssize_t regulator_uV_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329{
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
331 ssize_t ret;
332
333 mutex_lock(&rdev->mutex);
334 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
335 mutex_unlock(&rdev->mutex);
336
337 return ret;
338}
339static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
340
341static ssize_t regulator_uA_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343{
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
345
346 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
347}
348static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
349
350static ssize_t name_show(struct device *dev, struct device_attribute *attr,
351 char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
354
355 return sprintf(buf, "%s\n", rdev_get_name(rdev));
356}
357static DEVICE_ATTR_RO(name);
358
359static ssize_t regulator_print_opmode(char *buf, int mode)
360{
361 switch (mode) {
362 case REGULATOR_MODE_FAST:
363 return sprintf(buf, "fast\n");
364 case REGULATOR_MODE_NORMAL:
365 return sprintf(buf, "normal\n");
366 case REGULATOR_MODE_IDLE:
367 return sprintf(buf, "idle\n");
368 case REGULATOR_MODE_STANDBY:
369 return sprintf(buf, "standby\n");
370 }
371 return sprintf(buf, "unknown\n");
372}
373
374static ssize_t regulator_opmode_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
376{
377 struct regulator_dev *rdev = dev_get_drvdata(dev);
378
379 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
380}
381static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
382
383static ssize_t regulator_print_state(char *buf, int state)
384{
385 if (state > 0)
386 return sprintf(buf, "enabled\n");
387 else if (state == 0)
388 return sprintf(buf, "disabled\n");
389 else
390 return sprintf(buf, "unknown\n");
391}
392
393static ssize_t regulator_state_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395{
396 struct regulator_dev *rdev = dev_get_drvdata(dev);
397 ssize_t ret;
398
399 mutex_lock(&rdev->mutex);
400 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
401 mutex_unlock(&rdev->mutex);
402
403 return ret;
404}
405static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
406
407static ssize_t regulator_status_show(struct device *dev,
408 struct device_attribute *attr, char *buf)
409{
410 struct regulator_dev *rdev = dev_get_drvdata(dev);
411 int status;
412 char *label;
413
414 status = rdev->desc->ops->get_status(rdev);
415 if (status < 0)
416 return status;
417
418 switch (status) {
419 case REGULATOR_STATUS_OFF:
420 label = "off";
421 break;
422 case REGULATOR_STATUS_ON:
423 label = "on";
424 break;
425 case REGULATOR_STATUS_ERROR:
426 label = "error";
427 break;
428 case REGULATOR_STATUS_FAST:
429 label = "fast";
430 break;
431 case REGULATOR_STATUS_NORMAL:
432 label = "normal";
433 break;
434 case REGULATOR_STATUS_IDLE:
435 label = "idle";
436 break;
437 case REGULATOR_STATUS_STANDBY:
438 label = "standby";
439 break;
440 case REGULATOR_STATUS_BYPASS:
441 label = "bypass";
442 break;
443 case REGULATOR_STATUS_UNDEFINED:
444 label = "undefined";
445 break;
446 default:
447 return -ERANGE;
448 }
449
450 return sprintf(buf, "%s\n", label);
451}
452static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
453
454static ssize_t regulator_min_uA_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_uA);
463}
464static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
465
466static ssize_t regulator_max_uA_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_uA);
475}
476static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
477
478static ssize_t regulator_min_uV_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
482
483 if (!rdev->constraints)
484 return sprintf(buf, "constraint not defined\n");
485
486 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
487}
488static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
489
490static ssize_t regulator_max_uV_show(struct device *dev,
491 struct device_attribute *attr, char *buf)
492{
493 struct regulator_dev *rdev = dev_get_drvdata(dev);
494
495 if (!rdev->constraints)
496 return sprintf(buf, "constraint not defined\n");
497
498 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
499}
500static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
501
502static ssize_t regulator_total_uA_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
504{
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
506 struct regulator *regulator;
507 int uA = 0;
508
509 mutex_lock(&rdev->mutex);
510 list_for_each_entry(regulator, &rdev->consumer_list, list)
511 uA += regulator->uA_load;
512 mutex_unlock(&rdev->mutex);
513 return sprintf(buf, "%d\n", uA);
514}
515static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
516
517static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
518 char *buf)
519{
520 struct regulator_dev *rdev = dev_get_drvdata(dev);
521 return sprintf(buf, "%d\n", rdev->use_count);
522}
523static DEVICE_ATTR_RO(num_users);
524
525static ssize_t type_show(struct device *dev, struct device_attribute *attr,
526 char *buf)
527{
528 struct regulator_dev *rdev = dev_get_drvdata(dev);
529
530 switch (rdev->desc->type) {
531 case REGULATOR_VOLTAGE:
532 return sprintf(buf, "voltage\n");
533 case REGULATOR_CURRENT:
534 return sprintf(buf, "current\n");
535 }
536 return sprintf(buf, "unknown\n");
537}
538static DEVICE_ATTR_RO(type);
539
540static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542{
543 struct regulator_dev *rdev = dev_get_drvdata(dev);
544
545 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
546}
547static DEVICE_ATTR(suspend_mem_microvolts, 0444,
548 regulator_suspend_mem_uV_show, NULL);
549
550static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
551 struct device_attribute *attr, char *buf)
552{
553 struct regulator_dev *rdev = dev_get_drvdata(dev);
554
555 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
556}
557static DEVICE_ATTR(suspend_disk_microvolts, 0444,
558 regulator_suspend_disk_uV_show, NULL);
559
560static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
561 struct device_attribute *attr, char *buf)
562{
563 struct regulator_dev *rdev = dev_get_drvdata(dev);
564
565 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
566}
567static DEVICE_ATTR(suspend_standby_microvolts, 0444,
568 regulator_suspend_standby_uV_show, NULL);
569
570static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
571 struct device_attribute *attr, char *buf)
572{
573 struct regulator_dev *rdev = dev_get_drvdata(dev);
574
575 return regulator_print_opmode(buf,
576 rdev->constraints->state_mem.mode);
577}
578static DEVICE_ATTR(suspend_mem_mode, 0444,
579 regulator_suspend_mem_mode_show, NULL);
580
581static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
583{
584 struct regulator_dev *rdev = dev_get_drvdata(dev);
585
586 return regulator_print_opmode(buf,
587 rdev->constraints->state_disk.mode);
588}
589static DEVICE_ATTR(suspend_disk_mode, 0444,
590 regulator_suspend_disk_mode_show, NULL);
591
592static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
594{
595 struct regulator_dev *rdev = dev_get_drvdata(dev);
596
597 return regulator_print_opmode(buf,
598 rdev->constraints->state_standby.mode);
599}
600static DEVICE_ATTR(suspend_standby_mode, 0444,
601 regulator_suspend_standby_mode_show, NULL);
602
603static ssize_t regulator_suspend_mem_state_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
605{
606 struct regulator_dev *rdev = dev_get_drvdata(dev);
607
608 return regulator_print_state(buf,
609 rdev->constraints->state_mem.enabled);
610}
611static DEVICE_ATTR(suspend_mem_state, 0444,
612 regulator_suspend_mem_state_show, NULL);
613
614static ssize_t regulator_suspend_disk_state_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
616{
617 struct regulator_dev *rdev = dev_get_drvdata(dev);
618
619 return regulator_print_state(buf,
620 rdev->constraints->state_disk.enabled);
621}
622static DEVICE_ATTR(suspend_disk_state, 0444,
623 regulator_suspend_disk_state_show, NULL);
624
625static ssize_t regulator_suspend_standby_state_show(struct device *dev,
626 struct device_attribute *attr, char *buf)
627{
628 struct regulator_dev *rdev = dev_get_drvdata(dev);
629
630 return regulator_print_state(buf,
631 rdev->constraints->state_standby.enabled);
632}
633static DEVICE_ATTR(suspend_standby_state, 0444,
634 regulator_suspend_standby_state_show, NULL);
635
636static ssize_t regulator_bypass_show(struct device *dev,
637 struct device_attribute *attr, char *buf)
638{
639 struct regulator_dev *rdev = dev_get_drvdata(dev);
640 const char *report;
641 bool bypass;
642 int ret;
643
644 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
645
646 if (ret != 0)
647 report = "unknown";
648 else if (bypass)
649 report = "enabled";
650 else
651 report = "disabled";
652
653 return sprintf(buf, "%s\n", report);
654}
655static DEVICE_ATTR(bypass, 0444,
656 regulator_bypass_show, NULL);
657
658/* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660static int 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 lockdep_assert_held_once(&rdev->mutex);
667
668 /*
669 * first check to see if we can set modes at all, otherwise just
670 * tell the consumer everything is OK.
671 */
672 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
673 return 0;
674
675 if (!rdev->desc->ops->get_optimum_mode &&
676 !rdev->desc->ops->set_load)
677 return 0;
678
679 if (!rdev->desc->ops->set_mode &&
680 !rdev->desc->ops->set_load)
681 return -EINVAL;
682
683 /* calc total requested load */
684 list_for_each_entry(sibling, &rdev->consumer_list, list)
685 current_uA += sibling->uA_load;
686
687 current_uA += rdev->constraints->system_load;
688
689 if (rdev->desc->ops->set_load) {
690 /* set the optimum mode for our new total regulator load */
691 err = rdev->desc->ops->set_load(rdev, current_uA);
692 if (err < 0)
693 rdev_err(rdev, "failed to set load %d\n", current_uA);
694 } else {
695 /* get output voltage */
696 output_uV = _regulator_get_voltage(rdev);
697 if (output_uV <= 0) {
698 rdev_err(rdev, "invalid output voltage found\n");
699 return -EINVAL;
700 }
701
702 /* get input voltage */
703 input_uV = 0;
704 if (rdev->supply)
705 input_uV = regulator_get_voltage(rdev->supply);
706 if (input_uV <= 0)
707 input_uV = rdev->constraints->input_uV;
708 if (input_uV <= 0) {
709 rdev_err(rdev, "invalid input voltage found\n");
710 return -EINVAL;
711 }
712
713 /* now get the optimum mode for our new total regulator load */
714 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
715 output_uV, current_uA);
716
717 /* check the new mode is allowed */
718 err = regulator_mode_constrain(rdev, &mode);
719 if (err < 0) {
720 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
721 current_uA, input_uV, output_uV);
722 return err;
723 }
724
725 err = rdev->desc->ops->set_mode(rdev, mode);
726 if (err < 0)
727 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
728 }
729
730 return err;
731}
732
733static int suspend_set_state(struct regulator_dev *rdev,
734 struct regulator_state *rstate)
735{
736 int ret = 0;
737
738 /* If we have no suspend mode configration don't set anything;
739 * only warn if the driver implements set_suspend_voltage or
740 * set_suspend_mode callback.
741 */
742 if (!rstate->enabled && !rstate->disabled) {
743 if (rdev->desc->ops->set_suspend_voltage ||
744 rdev->desc->ops->set_suspend_mode)
745 rdev_warn(rdev, "No configuration\n");
746 return 0;
747 }
748
749 if (rstate->enabled && rstate->disabled) {
750 rdev_err(rdev, "invalid configuration\n");
751 return -EINVAL;
752 }
753
754 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
755 ret = rdev->desc->ops->set_suspend_enable(rdev);
756 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
757 ret = rdev->desc->ops->set_suspend_disable(rdev);
758 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
759 ret = 0;
760
761 if (ret < 0) {
762 rdev_err(rdev, "failed to enabled/disable\n");
763 return ret;
764 }
765
766 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
767 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
768 if (ret < 0) {
769 rdev_err(rdev, "failed to set voltage\n");
770 return ret;
771 }
772 }
773
774 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
775 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
776 if (ret < 0) {
777 rdev_err(rdev, "failed to set mode\n");
778 return ret;
779 }
780 }
781 return ret;
782}
783
784/* locks held by caller */
785static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
786{
787 if (!rdev->constraints)
788 return -EINVAL;
789
790 switch (state) {
791 case PM_SUSPEND_STANDBY:
792 return suspend_set_state(rdev,
793 &rdev->constraints->state_standby);
794 case PM_SUSPEND_MEM:
795 return suspend_set_state(rdev,
796 &rdev->constraints->state_mem);
797 case PM_SUSPEND_MAX:
798 return suspend_set_state(rdev,
799 &rdev->constraints->state_disk);
800 default:
801 return -EINVAL;
802 }
803}
804
805static void print_constraints(struct regulator_dev *rdev)
806{
807 struct regulation_constraints *constraints = rdev->constraints;
808 char buf[160] = "";
809 size_t len = sizeof(buf) - 1;
810 int count = 0;
811 int ret;
812
813 if (constraints->min_uV && constraints->max_uV) {
814 if (constraints->min_uV == constraints->max_uV)
815 count += scnprintf(buf + count, len - count, "%d mV ",
816 constraints->min_uV / 1000);
817 else
818 count += scnprintf(buf + count, len - count,
819 "%d <--> %d mV ",
820 constraints->min_uV / 1000,
821 constraints->max_uV / 1000);
822 }
823
824 if (!constraints->min_uV ||
825 constraints->min_uV != constraints->max_uV) {
826 ret = _regulator_get_voltage(rdev);
827 if (ret > 0)
828 count += scnprintf(buf + count, len - count,
829 "at %d mV ", ret / 1000);
830 }
831
832 if (constraints->uV_offset)
833 count += scnprintf(buf + count, len - count, "%dmV offset ",
834 constraints->uV_offset / 1000);
835
836 if (constraints->min_uA && constraints->max_uA) {
837 if (constraints->min_uA == constraints->max_uA)
838 count += scnprintf(buf + count, len - count, "%d mA ",
839 constraints->min_uA / 1000);
840 else
841 count += scnprintf(buf + count, len - count,
842 "%d <--> %d mA ",
843 constraints->min_uA / 1000,
844 constraints->max_uA / 1000);
845 }
846
847 if (!constraints->min_uA ||
848 constraints->min_uA != constraints->max_uA) {
849 ret = _regulator_get_current_limit(rdev);
850 if (ret > 0)
851 count += scnprintf(buf + count, len - count,
852 "at %d mA ", ret / 1000);
853 }
854
855 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
856 count += scnprintf(buf + count, len - count, "fast ");
857 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
858 count += scnprintf(buf + count, len - count, "normal ");
859 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
860 count += scnprintf(buf + count, len - count, "idle ");
861 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
862 count += scnprintf(buf + count, len - count, "standby");
863
864 if (!count)
865 scnprintf(buf, len, "no parameters");
866
867 rdev_dbg(rdev, "%s\n", buf);
868
869 if ((constraints->min_uV != constraints->max_uV) &&
870 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
871 rdev_warn(rdev,
872 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
873}
874
875static int machine_constraints_voltage(struct regulator_dev *rdev,
876 struct regulation_constraints *constraints)
877{
878 const struct regulator_ops *ops = rdev->desc->ops;
879 int ret;
880
881 /* do we need to apply the constraint voltage */
882 if (rdev->constraints->apply_uV &&
883 rdev->constraints->min_uV && rdev->constraints->max_uV) {
884 int target_min, target_max;
885 int current_uV = _regulator_get_voltage(rdev);
886 if (current_uV < 0) {
887 rdev_err(rdev,
888 "failed to get the current voltage(%d)\n",
889 current_uV);
890 return current_uV;
891 }
892
893 /*
894 * If we're below the minimum voltage move up to the
895 * minimum voltage, if we're above the maximum voltage
896 * then move down to the maximum.
897 */
898 target_min = current_uV;
899 target_max = current_uV;
900
901 if (current_uV < rdev->constraints->min_uV) {
902 target_min = rdev->constraints->min_uV;
903 target_max = rdev->constraints->min_uV;
904 }
905
906 if (current_uV > rdev->constraints->max_uV) {
907 target_min = rdev->constraints->max_uV;
908 target_max = rdev->constraints->max_uV;
909 }
910
911 if (target_min != current_uV || target_max != current_uV) {
912 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
913 current_uV, target_min, target_max);
914 ret = _regulator_do_set_voltage(
915 rdev, target_min, target_max);
916 if (ret < 0) {
917 rdev_err(rdev,
918 "failed to apply %d-%duV constraint(%d)\n",
919 target_min, target_max, ret);
920 return ret;
921 }
922 }
923 }
924
925 /* constrain machine-level voltage specs to fit
926 * the actual range supported by this regulator.
927 */
928 if (ops->list_voltage && rdev->desc->n_voltages) {
929 int count = rdev->desc->n_voltages;
930 int i;
931 int min_uV = INT_MAX;
932 int max_uV = INT_MIN;
933 int cmin = constraints->min_uV;
934 int cmax = constraints->max_uV;
935
936 /* it's safe to autoconfigure fixed-voltage supplies
937 and the constraints are used by list_voltage. */
938 if (count == 1 && !cmin) {
939 cmin = 1;
940 cmax = INT_MAX;
941 constraints->min_uV = cmin;
942 constraints->max_uV = cmax;
943 }
944
945 /* voltage constraints are optional */
946 if ((cmin == 0) && (cmax == 0))
947 return 0;
948
949 /* else require explicit machine-level constraints */
950 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
951 rdev_err(rdev, "invalid voltage constraints\n");
952 return -EINVAL;
953 }
954
955 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
956 for (i = 0; i < count; i++) {
957 int value;
958
959 value = ops->list_voltage(rdev, i);
960 if (value <= 0)
961 continue;
962
963 /* maybe adjust [min_uV..max_uV] */
964 if (value >= cmin && value < min_uV)
965 min_uV = value;
966 if (value <= cmax && value > max_uV)
967 max_uV = value;
968 }
969
970 /* final: [min_uV..max_uV] valid iff constraints valid */
971 if (max_uV < min_uV) {
972 rdev_err(rdev,
973 "unsupportable voltage constraints %u-%uuV\n",
974 min_uV, max_uV);
975 return -EINVAL;
976 }
977
978 /* use regulator's subset of machine constraints */
979 if (constraints->min_uV < min_uV) {
980 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
981 constraints->min_uV, min_uV);
982 constraints->min_uV = min_uV;
983 }
984 if (constraints->max_uV > max_uV) {
985 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
986 constraints->max_uV, max_uV);
987 constraints->max_uV = max_uV;
988 }
989 }
990
991 return 0;
992}
993
994static int machine_constraints_current(struct regulator_dev *rdev,
995 struct regulation_constraints *constraints)
996{
997 const struct regulator_ops *ops = rdev->desc->ops;
998 int ret;
999
1000 if (!constraints->min_uA && !constraints->max_uA)
1001 return 0;
1002
1003 if (constraints->min_uA > constraints->max_uA) {
1004 rdev_err(rdev, "Invalid current constraints\n");
1005 return -EINVAL;
1006 }
1007
1008 if (!ops->set_current_limit || !ops->get_current_limit) {
1009 rdev_warn(rdev, "Operation of current configuration missing\n");
1010 return 0;
1011 }
1012
1013 /* Set regulator current in constraints range */
1014 ret = ops->set_current_limit(rdev, constraints->min_uA,
1015 constraints->max_uA);
1016 if (ret < 0) {
1017 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1018 return ret;
1019 }
1020
1021 return 0;
1022}
1023
1024static int _regulator_do_enable(struct regulator_dev *rdev);
1025
1026/**
1027 * set_machine_constraints - sets regulator constraints
1028 * @rdev: regulator source
1029 * @constraints: constraints to apply
1030 *
1031 * Allows platform initialisation code to define and constrain
1032 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1033 * Constraints *must* be set by platform code in order for some
1034 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1035 * set_mode.
1036 */
1037static int set_machine_constraints(struct regulator_dev *rdev,
1038 const struct regulation_constraints *constraints)
1039{
1040 int ret = 0;
1041 const struct regulator_ops *ops = rdev->desc->ops;
1042
1043 if (constraints)
1044 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1045 GFP_KERNEL);
1046 else
1047 rdev->constraints = kzalloc(sizeof(*constraints),
1048 GFP_KERNEL);
1049 if (!rdev->constraints)
1050 return -ENOMEM;
1051
1052 ret = machine_constraints_voltage(rdev, rdev->constraints);
1053 if (ret != 0)
1054 return ret;
1055
1056 ret = machine_constraints_current(rdev, rdev->constraints);
1057 if (ret != 0)
1058 return ret;
1059
1060 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1061 ret = ops->set_input_current_limit(rdev,
1062 rdev->constraints->ilim_uA);
1063 if (ret < 0) {
1064 rdev_err(rdev, "failed to set input limit\n");
1065 return ret;
1066 }
1067 }
1068
1069 /* do we need to setup our suspend state */
1070 if (rdev->constraints->initial_state) {
1071 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1072 if (ret < 0) {
1073 rdev_err(rdev, "failed to set suspend state\n");
1074 return ret;
1075 }
1076 }
1077
1078 if (rdev->constraints->initial_mode) {
1079 if (!ops->set_mode) {
1080 rdev_err(rdev, "no set_mode operation\n");
1081 return -EINVAL;
1082 }
1083
1084 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1085 if (ret < 0) {
1086 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1087 return ret;
1088 }
1089 }
1090
1091 /* If the constraints say the regulator should be on at this point
1092 * and we have control then make sure it is enabled.
1093 */
1094 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1095 ret = _regulator_do_enable(rdev);
1096 if (ret < 0 && ret != -EINVAL) {
1097 rdev_err(rdev, "failed to enable\n");
1098 return ret;
1099 }
1100 }
1101
1102 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1103 && ops->set_ramp_delay) {
1104 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1105 if (ret < 0) {
1106 rdev_err(rdev, "failed to set ramp_delay\n");
1107 return ret;
1108 }
1109 }
1110
1111 if (rdev->constraints->pull_down && ops->set_pull_down) {
1112 ret = ops->set_pull_down(rdev);
1113 if (ret < 0) {
1114 rdev_err(rdev, "failed to set pull down\n");
1115 return ret;
1116 }
1117 }
1118
1119 if (rdev->constraints->soft_start && ops->set_soft_start) {
1120 ret = ops->set_soft_start(rdev);
1121 if (ret < 0) {
1122 rdev_err(rdev, "failed to set soft start\n");
1123 return ret;
1124 }
1125 }
1126
1127 if (rdev->constraints->over_current_protection
1128 && ops->set_over_current_protection) {
1129 ret = ops->set_over_current_protection(rdev);
1130 if (ret < 0) {
1131 rdev_err(rdev, "failed to set over current protection\n");
1132 return ret;
1133 }
1134 }
1135
1136 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1137 bool ad_state = (rdev->constraints->active_discharge ==
1138 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1139
1140 ret = ops->set_active_discharge(rdev, ad_state);
1141 if (ret < 0) {
1142 rdev_err(rdev, "failed to set active discharge\n");
1143 return ret;
1144 }
1145 }
1146
1147 print_constraints(rdev);
1148 return 0;
1149}
1150
1151/**
1152 * set_supply - set regulator supply regulator
1153 * @rdev: regulator name
1154 * @supply_rdev: supply regulator name
1155 *
1156 * Called by platform initialisation code to set the supply regulator for this
1157 * regulator. This ensures that a regulators supply will also be enabled by the
1158 * core if it's child is enabled.
1159 */
1160static int set_supply(struct regulator_dev *rdev,
1161 struct regulator_dev *supply_rdev)
1162{
1163 int err;
1164
1165 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166
1167 if (!try_module_get(supply_rdev->owner))
1168 return -ENODEV;
1169
1170 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1171 if (rdev->supply == NULL) {
1172 err = -ENOMEM;
1173 return err;
1174 }
1175 supply_rdev->open_count++;
1176
1177 return 0;
1178}
1179
1180/**
1181 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1182 * @rdev: regulator source
1183 * @consumer_dev_name: dev_name() string for device supply applies to
1184 * @supply: symbolic name for supply
1185 *
1186 * Allows platform initialisation code to map physical regulator
1187 * sources to symbolic names for supplies for use by devices. Devices
1188 * should use these symbolic names to request regulators, avoiding the
1189 * need to provide board-specific regulator names as platform data.
1190 */
1191static int set_consumer_device_supply(struct regulator_dev *rdev,
1192 const char *consumer_dev_name,
1193 const char *supply)
1194{
1195 struct regulator_map *node;
1196 int has_dev;
1197
1198 if (supply == NULL)
1199 return -EINVAL;
1200
1201 if (consumer_dev_name != NULL)
1202 has_dev = 1;
1203 else
1204 has_dev = 0;
1205
1206 list_for_each_entry(node, &regulator_map_list, list) {
1207 if (node->dev_name && consumer_dev_name) {
1208 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209 continue;
1210 } else if (node->dev_name || consumer_dev_name) {
1211 continue;
1212 }
1213
1214 if (strcmp(node->supply, supply) != 0)
1215 continue;
1216
1217 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218 consumer_dev_name,
1219 dev_name(&node->regulator->dev),
1220 node->regulator->desc->name,
1221 supply,
1222 dev_name(&rdev->dev), rdev_get_name(rdev));
1223 return -EBUSY;
1224 }
1225
1226 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1227 if (node == NULL)
1228 return -ENOMEM;
1229
1230 node->regulator = rdev;
1231 node->supply = supply;
1232
1233 if (has_dev) {
1234 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1235 if (node->dev_name == NULL) {
1236 kfree(node);
1237 return -ENOMEM;
1238 }
1239 }
1240
1241 list_add(&node->list, &regulator_map_list);
1242 return 0;
1243}
1244
1245static void unset_regulator_supplies(struct regulator_dev *rdev)
1246{
1247 struct regulator_map *node, *n;
1248
1249 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1250 if (rdev == node->regulator) {
1251 list_del(&node->list);
1252 kfree(node->dev_name);
1253 kfree(node);
1254 }
1255 }
1256}
1257
1258#ifdef CONFIG_DEBUG_FS
1259static ssize_t constraint_flags_read_file(struct file *file,
1260 char __user *user_buf,
1261 size_t count, loff_t *ppos)
1262{
1263 const struct regulator *regulator = file->private_data;
1264 const struct regulation_constraints *c = regulator->rdev->constraints;
1265 char *buf;
1266 ssize_t ret;
1267
1268 if (!c)
1269 return 0;
1270
1271 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1272 if (!buf)
1273 return -ENOMEM;
1274
1275 ret = snprintf(buf, PAGE_SIZE,
1276 "always_on: %u\n"
1277 "boot_on: %u\n"
1278 "apply_uV: %u\n"
1279 "ramp_disable: %u\n"
1280 "soft_start: %u\n"
1281 "pull_down: %u\n"
1282 "over_current_protection: %u\n",
1283 c->always_on,
1284 c->boot_on,
1285 c->apply_uV,
1286 c->ramp_disable,
1287 c->soft_start,
1288 c->pull_down,
1289 c->over_current_protection);
1290
1291 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1292 kfree(buf);
1293
1294 return ret;
1295}
1296
1297#endif
1298
1299static const struct file_operations constraint_flags_fops = {
1300#ifdef CONFIG_DEBUG_FS
1301 .open = simple_open,
1302 .read = constraint_flags_read_file,
1303 .llseek = default_llseek,
1304#endif
1305};
1306
1307#define REG_STR_SIZE 64
1308
1309static struct regulator *create_regulator(struct regulator_dev *rdev,
1310 struct device *dev,
1311 const char *supply_name)
1312{
1313 struct regulator *regulator;
1314 char buf[REG_STR_SIZE];
1315 int err, size;
1316
1317 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1318 if (regulator == NULL)
1319 return NULL;
1320
1321 mutex_lock(&rdev->mutex);
1322 regulator->rdev = rdev;
1323 list_add(&regulator->list, &rdev->consumer_list);
1324
1325 if (dev) {
1326 regulator->dev = dev;
1327
1328 /* Add a link to the device sysfs entry */
1329 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1330 dev->kobj.name, supply_name);
1331 if (size >= REG_STR_SIZE)
1332 goto overflow_err;
1333
1334 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1335 if (regulator->supply_name == NULL)
1336 goto overflow_err;
1337
1338 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1339 buf);
1340 if (err) {
1341 rdev_dbg(rdev, "could not add device link %s err %d\n",
1342 dev->kobj.name, err);
1343 /* non-fatal */
1344 }
1345 } else {
1346 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1347 if (regulator->supply_name == NULL)
1348 goto overflow_err;
1349 }
1350
1351 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1352 rdev->debugfs);
1353 if (!regulator->debugfs) {
1354 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1355 } else {
1356 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1357 &regulator->uA_load);
1358 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1359 &regulator->min_uV);
1360 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1361 &regulator->max_uV);
1362 debugfs_create_file("constraint_flags", 0444,
1363 regulator->debugfs, regulator,
1364 &constraint_flags_fops);
1365 }
1366
1367 /*
1368 * Check now if the regulator is an always on regulator - if
1369 * it is then we don't need to do nearly so much work for
1370 * enable/disable calls.
1371 */
1372 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1373 _regulator_is_enabled(rdev))
1374 regulator->always_on = true;
1375
1376 mutex_unlock(&rdev->mutex);
1377 return regulator;
1378overflow_err:
1379 list_del(&regulator->list);
1380 kfree(regulator);
1381 mutex_unlock(&rdev->mutex);
1382 return NULL;
1383}
1384
1385static int _regulator_get_enable_time(struct regulator_dev *rdev)
1386{
1387 if (rdev->constraints && rdev->constraints->enable_time)
1388 return rdev->constraints->enable_time;
1389 if (!rdev->desc->ops->enable_time)
1390 return rdev->desc->enable_time;
1391 return rdev->desc->ops->enable_time(rdev);
1392}
1393
1394static struct regulator_supply_alias *regulator_find_supply_alias(
1395 struct device *dev, const char *supply)
1396{
1397 struct regulator_supply_alias *map;
1398
1399 list_for_each_entry(map, &regulator_supply_alias_list, list)
1400 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1401 return map;
1402
1403 return NULL;
1404}
1405
1406static void regulator_supply_alias(struct device **dev, const char **supply)
1407{
1408 struct regulator_supply_alias *map;
1409
1410 map = regulator_find_supply_alias(*dev, *supply);
1411 if (map) {
1412 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1413 *supply, map->alias_supply,
1414 dev_name(map->alias_dev));
1415 *dev = map->alias_dev;
1416 *supply = map->alias_supply;
1417 }
1418}
1419
1420static int of_node_match(struct device *dev, const void *data)
1421{
1422 return dev->of_node == data;
1423}
1424
1425static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1426{
1427 struct device *dev;
1428
1429 dev = class_find_device(&regulator_class, NULL, np, of_node_match);
1430
1431 return dev ? dev_to_rdev(dev) : NULL;
1432}
1433
1434static int regulator_match(struct device *dev, const void *data)
1435{
1436 struct regulator_dev *r = dev_to_rdev(dev);
1437
1438 return strcmp(rdev_get_name(r), data) == 0;
1439}
1440
1441static struct regulator_dev *regulator_lookup_by_name(const char *name)
1442{
1443 struct device *dev;
1444
1445 dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1446
1447 return dev ? dev_to_rdev(dev) : NULL;
1448}
1449
1450/**
1451 * regulator_dev_lookup - lookup a regulator device.
1452 * @dev: device for regulator "consumer".
1453 * @supply: Supply name or regulator ID.
1454 *
1455 * If successful, returns a struct regulator_dev that corresponds to the name
1456 * @supply and with the embedded struct device refcount incremented by one.
1457 * The refcount must be dropped by calling put_device().
1458 * On failure one of the following ERR-PTR-encoded values is returned:
1459 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1460 * in the future.
1461 */
1462static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1463 const char *supply)
1464{
1465 struct regulator_dev *r = NULL;
1466 struct device_node *node;
1467 struct regulator_map *map;
1468 const char *devname = NULL;
1469
1470 regulator_supply_alias(&dev, &supply);
1471
1472 /* first do a dt based lookup */
1473 if (dev && dev->of_node) {
1474 node = of_get_regulator(dev, supply);
1475 if (node) {
1476 r = of_find_regulator_by_node(node);
1477 if (r)
1478 return r;
1479
1480 /*
1481 * We have a node, but there is no device.
1482 * assume it has not registered yet.
1483 */
1484 return ERR_PTR(-EPROBE_DEFER);
1485 }
1486 }
1487
1488 /* if not found, try doing it non-dt way */
1489 if (dev)
1490 devname = dev_name(dev);
1491
1492 mutex_lock(&regulator_list_mutex);
1493 list_for_each_entry(map, &regulator_map_list, list) {
1494 /* If the mapping has a device set up it must match */
1495 if (map->dev_name &&
1496 (!devname || strcmp(map->dev_name, devname)))
1497 continue;
1498
1499 if (strcmp(map->supply, supply) == 0 &&
1500 get_device(&map->regulator->dev)) {
1501 r = map->regulator;
1502 break;
1503 }
1504 }
1505 mutex_unlock(&regulator_list_mutex);
1506
1507 if (r)
1508 return r;
1509
1510 r = regulator_lookup_by_name(supply);
1511 if (r)
1512 return r;
1513
1514 return ERR_PTR(-ENODEV);
1515}
1516
1517static int regulator_resolve_supply(struct regulator_dev *rdev)
1518{
1519 struct regulator_dev *r;
1520 struct device *dev = rdev->dev.parent;
1521 int ret;
1522
1523 /* No supply to resovle? */
1524 if (!rdev->supply_name)
1525 return 0;
1526
1527 /* Supply already resolved? */
1528 if (rdev->supply)
1529 return 0;
1530
1531 r = regulator_dev_lookup(dev, rdev->supply_name);
1532 if (IS_ERR(r)) {
1533 ret = PTR_ERR(r);
1534
1535 /* Did the lookup explicitly defer for us? */
1536 if (ret == -EPROBE_DEFER)
1537 return ret;
1538
1539 if (have_full_constraints()) {
1540 r = dummy_regulator_rdev;
1541 get_device(&r->dev);
1542 } else {
1543 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1544 rdev->supply_name, rdev->desc->name);
1545 return -EPROBE_DEFER;
1546 }
1547 }
1548
1549 /*
1550 * If the supply's parent device is not the same as the
1551 * regulator's parent device, then ensure the parent device
1552 * is bound before we resolve the supply, in case the parent
1553 * device get probe deferred and unregisters the supply.
1554 */
1555 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1556 if (!device_is_bound(r->dev.parent)) {
1557 put_device(&r->dev);
1558 return -EPROBE_DEFER;
1559 }
1560 }
1561
1562 /* Recursively resolve the supply of the supply */
1563 ret = regulator_resolve_supply(r);
1564 if (ret < 0) {
1565 put_device(&r->dev);
1566 return ret;
1567 }
1568
1569 ret = set_supply(rdev, r);
1570 if (ret < 0) {
1571 put_device(&r->dev);
1572 return ret;
1573 }
1574
1575 /* Cascade always-on state to supply */
1576 if (_regulator_is_enabled(rdev)) {
1577 ret = regulator_enable(rdev->supply);
1578 if (ret < 0) {
1579 _regulator_put(rdev->supply);
1580 rdev->supply = NULL;
1581 return ret;
1582 }
1583 }
1584
1585 return 0;
1586}
1587
1588/* Internal regulator request function */
1589struct regulator *_regulator_get(struct device *dev, const char *id,
1590 enum regulator_get_type get_type)
1591{
1592 struct regulator_dev *rdev;
1593 struct regulator *regulator;
1594 const char *devname = dev ? dev_name(dev) : "deviceless";
1595 int ret;
1596
1597 if (get_type >= MAX_GET_TYPE) {
1598 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1599 return ERR_PTR(-EINVAL);
1600 }
1601
1602 if (id == NULL) {
1603 pr_err("get() with no identifier\n");
1604 return ERR_PTR(-EINVAL);
1605 }
1606
1607 rdev = regulator_dev_lookup(dev, id);
1608 if (IS_ERR(rdev)) {
1609 ret = PTR_ERR(rdev);
1610
1611 /*
1612 * If regulator_dev_lookup() fails with error other
1613 * than -ENODEV our job here is done, we simply return it.
1614 */
1615 if (ret != -ENODEV)
1616 return ERR_PTR(ret);
1617
1618 if (!have_full_constraints()) {
1619 dev_warn(dev,
1620 "incomplete constraints, dummy supplies not allowed\n");
1621 return ERR_PTR(-ENODEV);
1622 }
1623
1624 switch (get_type) {
1625 case NORMAL_GET:
1626 /*
1627 * Assume that a regulator is physically present and
1628 * enabled, even if it isn't hooked up, and just
1629 * provide a dummy.
1630 */
1631 dev_warn(dev,
1632 "%s supply %s not found, using dummy regulator\n",
1633 devname, id);
1634 rdev = dummy_regulator_rdev;
1635 get_device(&rdev->dev);
1636 break;
1637
1638 case EXCLUSIVE_GET:
1639 dev_warn(dev,
1640 "dummy supplies not allowed for exclusive requests\n");
1641 /* fall through */
1642
1643 default:
1644 return ERR_PTR(-ENODEV);
1645 }
1646 }
1647
1648 if (rdev->exclusive) {
1649 regulator = ERR_PTR(-EPERM);
1650 put_device(&rdev->dev);
1651 return regulator;
1652 }
1653
1654 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1655 regulator = ERR_PTR(-EBUSY);
1656 put_device(&rdev->dev);
1657 return regulator;
1658 }
1659
1660 ret = regulator_resolve_supply(rdev);
1661 if (ret < 0) {
1662 regulator = ERR_PTR(ret);
1663 put_device(&rdev->dev);
1664 return regulator;
1665 }
1666
1667 if (!try_module_get(rdev->owner)) {
1668 regulator = ERR_PTR(-EPROBE_DEFER);
1669 put_device(&rdev->dev);
1670 return regulator;
1671 }
1672
1673 regulator = create_regulator(rdev, dev, id);
1674 if (regulator == NULL) {
1675 regulator = ERR_PTR(-ENOMEM);
1676 put_device(&rdev->dev);
1677 module_put(rdev->owner);
1678 return regulator;
1679 }
1680
1681 rdev->open_count++;
1682 if (get_type == EXCLUSIVE_GET) {
1683 rdev->exclusive = 1;
1684
1685 ret = _regulator_is_enabled(rdev);
1686 if (ret > 0)
1687 rdev->use_count = 1;
1688 else
1689 rdev->use_count = 0;
1690 }
1691
1692 return regulator;
1693}
1694
1695/**
1696 * regulator_get - lookup and obtain a reference to a regulator.
1697 * @dev: device for regulator "consumer"
1698 * @id: Supply name or regulator ID.
1699 *
1700 * Returns a struct regulator corresponding to the regulator producer,
1701 * or IS_ERR() condition containing errno.
1702 *
1703 * Use of supply names configured via regulator_set_device_supply() is
1704 * strongly encouraged. It is recommended that the supply name used
1705 * should match the name used for the supply and/or the relevant
1706 * device pins in the datasheet.
1707 */
1708struct regulator *regulator_get(struct device *dev, const char *id)
1709{
1710 return _regulator_get(dev, id, NORMAL_GET);
1711}
1712EXPORT_SYMBOL_GPL(regulator_get);
1713
1714/**
1715 * regulator_get_exclusive - obtain exclusive access to a regulator.
1716 * @dev: device for regulator "consumer"
1717 * @id: Supply name or regulator ID.
1718 *
1719 * Returns a struct regulator corresponding to the regulator producer,
1720 * or IS_ERR() condition containing errno. Other consumers will be
1721 * unable to obtain this regulator while this reference is held and the
1722 * use count for the regulator will be initialised to reflect the current
1723 * state of the regulator.
1724 *
1725 * This is intended for use by consumers which cannot tolerate shared
1726 * use of the regulator such as those which need to force the
1727 * regulator off for correct operation of the hardware they are
1728 * controlling.
1729 *
1730 * Use of supply names configured via regulator_set_device_supply() is
1731 * strongly encouraged. It is recommended that the supply name used
1732 * should match the name used for the supply and/or the relevant
1733 * device pins in the datasheet.
1734 */
1735struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1736{
1737 return _regulator_get(dev, id, EXCLUSIVE_GET);
1738}
1739EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1740
1741/**
1742 * regulator_get_optional - obtain optional access to a regulator.
1743 * @dev: device for regulator "consumer"
1744 * @id: Supply name or regulator ID.
1745 *
1746 * Returns a struct regulator corresponding to the regulator producer,
1747 * or IS_ERR() condition containing errno.
1748 *
1749 * This is intended for use by consumers for devices which can have
1750 * some supplies unconnected in normal use, such as some MMC devices.
1751 * It can allow the regulator core to provide stub supplies for other
1752 * supplies requested using normal regulator_get() calls without
1753 * disrupting the operation of drivers that can handle absent
1754 * supplies.
1755 *
1756 * Use of supply names configured via regulator_set_device_supply() is
1757 * strongly encouraged. It is recommended that the supply name used
1758 * should match the name used for the supply and/or the relevant
1759 * device pins in the datasheet.
1760 */
1761struct regulator *regulator_get_optional(struct device *dev, const char *id)
1762{
1763 return _regulator_get(dev, id, OPTIONAL_GET);
1764}
1765EXPORT_SYMBOL_GPL(regulator_get_optional);
1766
1767/* regulator_list_mutex lock held by regulator_put() */
1768static void _regulator_put(struct regulator *regulator)
1769{
1770 struct regulator_dev *rdev;
1771
1772 if (IS_ERR_OR_NULL(regulator))
1773 return;
1774
1775 lockdep_assert_held_once(&regulator_list_mutex);
1776
1777 rdev = regulator->rdev;
1778
1779 debugfs_remove_recursive(regulator->debugfs);
1780
1781 /* remove any sysfs entries */
1782 if (regulator->dev)
1783 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1784 mutex_lock(&rdev->mutex);
1785 list_del(&regulator->list);
1786
1787 rdev->open_count--;
1788 rdev->exclusive = 0;
1789 put_device(&rdev->dev);
1790 mutex_unlock(&rdev->mutex);
1791
1792 kfree_const(regulator->supply_name);
1793 kfree(regulator);
1794
1795 module_put(rdev->owner);
1796}
1797
1798/**
1799 * regulator_put - "free" the regulator source
1800 * @regulator: regulator source
1801 *
1802 * Note: drivers must ensure that all regulator_enable calls made on this
1803 * regulator source are balanced by regulator_disable calls prior to calling
1804 * this function.
1805 */
1806void regulator_put(struct regulator *regulator)
1807{
1808 mutex_lock(&regulator_list_mutex);
1809 _regulator_put(regulator);
1810 mutex_unlock(&regulator_list_mutex);
1811}
1812EXPORT_SYMBOL_GPL(regulator_put);
1813
1814/**
1815 * regulator_register_supply_alias - Provide device alias for supply lookup
1816 *
1817 * @dev: device that will be given as the regulator "consumer"
1818 * @id: Supply name or regulator ID
1819 * @alias_dev: device that should be used to lookup the supply
1820 * @alias_id: Supply name or regulator ID that should be used to lookup the
1821 * supply
1822 *
1823 * All lookups for id on dev will instead be conducted for alias_id on
1824 * alias_dev.
1825 */
1826int regulator_register_supply_alias(struct device *dev, const char *id,
1827 struct device *alias_dev,
1828 const char *alias_id)
1829{
1830 struct regulator_supply_alias *map;
1831
1832 map = regulator_find_supply_alias(dev, id);
1833 if (map)
1834 return -EEXIST;
1835
1836 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1837 if (!map)
1838 return -ENOMEM;
1839
1840 map->src_dev = dev;
1841 map->src_supply = id;
1842 map->alias_dev = alias_dev;
1843 map->alias_supply = alias_id;
1844
1845 list_add(&map->list, &regulator_supply_alias_list);
1846
1847 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1848 id, dev_name(dev), alias_id, dev_name(alias_dev));
1849
1850 return 0;
1851}
1852EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1853
1854/**
1855 * regulator_unregister_supply_alias - Remove device alias
1856 *
1857 * @dev: device that will be given as the regulator "consumer"
1858 * @id: Supply name or regulator ID
1859 *
1860 * Remove a lookup alias if one exists for id on dev.
1861 */
1862void regulator_unregister_supply_alias(struct device *dev, const char *id)
1863{
1864 struct regulator_supply_alias *map;
1865
1866 map = regulator_find_supply_alias(dev, id);
1867 if (map) {
1868 list_del(&map->list);
1869 kfree(map);
1870 }
1871}
1872EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1873
1874/**
1875 * regulator_bulk_register_supply_alias - register multiple aliases
1876 *
1877 * @dev: device that will be given as the regulator "consumer"
1878 * @id: List of supply names or regulator IDs
1879 * @alias_dev: device that should be used to lookup the supply
1880 * @alias_id: List of supply names or regulator IDs that should be used to
1881 * lookup the supply
1882 * @num_id: Number of aliases to register
1883 *
1884 * @return 0 on success, an errno on failure.
1885 *
1886 * This helper function allows drivers to register several supply
1887 * aliases in one operation. If any of the aliases cannot be
1888 * registered any aliases that were registered will be removed
1889 * before returning to the caller.
1890 */
1891int regulator_bulk_register_supply_alias(struct device *dev,
1892 const char *const *id,
1893 struct device *alias_dev,
1894 const char *const *alias_id,
1895 int num_id)
1896{
1897 int i;
1898 int ret;
1899
1900 for (i = 0; i < num_id; ++i) {
1901 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1902 alias_id[i]);
1903 if (ret < 0)
1904 goto err;
1905 }
1906
1907 return 0;
1908
1909err:
1910 dev_err(dev,
1911 "Failed to create supply alias %s,%s -> %s,%s\n",
1912 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1913
1914 while (--i >= 0)
1915 regulator_unregister_supply_alias(dev, id[i]);
1916
1917 return ret;
1918}
1919EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1920
1921/**
1922 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1923 *
1924 * @dev: device that will be given as the regulator "consumer"
1925 * @id: List of supply names or regulator IDs
1926 * @num_id: Number of aliases to unregister
1927 *
1928 * This helper function allows drivers to unregister several supply
1929 * aliases in one operation.
1930 */
1931void regulator_bulk_unregister_supply_alias(struct device *dev,
1932 const char *const *id,
1933 int num_id)
1934{
1935 int i;
1936
1937 for (i = 0; i < num_id; ++i)
1938 regulator_unregister_supply_alias(dev, id[i]);
1939}
1940EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1941
1942
1943/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1944static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1945 const struct regulator_config *config)
1946{
1947 struct regulator_enable_gpio *pin;
1948 struct gpio_desc *gpiod;
1949 int ret;
1950
1951 gpiod = gpio_to_desc(config->ena_gpio);
1952
1953 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1954 if (pin->gpiod == gpiod) {
1955 rdev_dbg(rdev, "GPIO %d is already used\n",
1956 config->ena_gpio);
1957 goto update_ena_gpio_to_rdev;
1958 }
1959 }
1960
1961 ret = gpio_request_one(config->ena_gpio,
1962 GPIOF_DIR_OUT | config->ena_gpio_flags,
1963 rdev_get_name(rdev));
1964 if (ret)
1965 return ret;
1966
1967 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1968 if (pin == NULL) {
1969 gpio_free(config->ena_gpio);
1970 return -ENOMEM;
1971 }
1972
1973 pin->gpiod = gpiod;
1974 pin->ena_gpio_invert = config->ena_gpio_invert;
1975 list_add(&pin->list, &regulator_ena_gpio_list);
1976
1977update_ena_gpio_to_rdev:
1978 pin->request_count++;
1979 rdev->ena_pin = pin;
1980 return 0;
1981}
1982
1983static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1984{
1985 struct regulator_enable_gpio *pin, *n;
1986
1987 if (!rdev->ena_pin)
1988 return;
1989
1990 /* Free the GPIO only in case of no use */
1991 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1992 if (pin->gpiod == rdev->ena_pin->gpiod) {
1993 if (pin->request_count <= 1) {
1994 pin->request_count = 0;
1995 gpiod_put(pin->gpiod);
1996 list_del(&pin->list);
1997 kfree(pin);
1998 rdev->ena_pin = NULL;
1999 return;
2000 } else {
2001 pin->request_count--;
2002 }
2003 }
2004 }
2005}
2006
2007/**
2008 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2009 * @rdev: regulator_dev structure
2010 * @enable: enable GPIO at initial use?
2011 *
2012 * GPIO is enabled in case of initial use. (enable_count is 0)
2013 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2014 */
2015static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2016{
2017 struct regulator_enable_gpio *pin = rdev->ena_pin;
2018
2019 if (!pin)
2020 return -EINVAL;
2021
2022 if (enable) {
2023 /* Enable GPIO at initial use */
2024 if (pin->enable_count == 0)
2025 gpiod_set_value_cansleep(pin->gpiod,
2026 !pin->ena_gpio_invert);
2027
2028 pin->enable_count++;
2029 } else {
2030 if (pin->enable_count > 1) {
2031 pin->enable_count--;
2032 return 0;
2033 }
2034
2035 /* Disable GPIO if not used */
2036 if (pin->enable_count <= 1) {
2037 gpiod_set_value_cansleep(pin->gpiod,
2038 pin->ena_gpio_invert);
2039 pin->enable_count = 0;
2040 }
2041 }
2042
2043 return 0;
2044}
2045
2046/**
2047 * _regulator_enable_delay - a delay helper function
2048 * @delay: time to delay in microseconds
2049 *
2050 * Delay for the requested amount of time as per the guidelines in:
2051 *
2052 * Documentation/timers/timers-howto.txt
2053 *
2054 * The assumption here is that regulators will never be enabled in
2055 * atomic context and therefore sleeping functions can be used.
2056 */
2057static void _regulator_enable_delay(unsigned int delay)
2058{
2059 unsigned int ms = delay / 1000;
2060 unsigned int us = delay % 1000;
2061
2062 if (ms > 0) {
2063 /*
2064 * For small enough values, handle super-millisecond
2065 * delays in the usleep_range() call below.
2066 */
2067 if (ms < 20)
2068 us += ms * 1000;
2069 else
2070 msleep(ms);
2071 }
2072
2073 /*
2074 * Give the scheduler some room to coalesce with any other
2075 * wakeup sources. For delays shorter than 10 us, don't even
2076 * bother setting up high-resolution timers and just busy-
2077 * loop.
2078 */
2079 if (us >= 10)
2080 usleep_range(us, us + 100);
2081 else
2082 udelay(us);
2083}
2084
2085static int _regulator_do_enable(struct regulator_dev *rdev)
2086{
2087 int ret, delay;
2088
2089 /* Query before enabling in case configuration dependent. */
2090 ret = _regulator_get_enable_time(rdev);
2091 if (ret >= 0) {
2092 delay = ret;
2093 } else {
2094 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2095 delay = 0;
2096 }
2097
2098 trace_regulator_enable(rdev_get_name(rdev));
2099
2100 if (rdev->desc->off_on_delay) {
2101 /* if needed, keep a distance of off_on_delay from last time
2102 * this regulator was disabled.
2103 */
2104 unsigned long start_jiffy = jiffies;
2105 unsigned long intended, max_delay, remaining;
2106
2107 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2108 intended = rdev->last_off_jiffy + max_delay;
2109
2110 if (time_before(start_jiffy, intended)) {
2111 /* calc remaining jiffies to deal with one-time
2112 * timer wrapping.
2113 * in case of multiple timer wrapping, either it can be
2114 * detected by out-of-range remaining, or it cannot be
2115 * detected and we gets a panelty of
2116 * _regulator_enable_delay().
2117 */
2118 remaining = intended - start_jiffy;
2119 if (remaining <= max_delay)
2120 _regulator_enable_delay(
2121 jiffies_to_usecs(remaining));
2122 }
2123 }
2124
2125 if (rdev->ena_pin) {
2126 if (!rdev->ena_gpio_state) {
2127 ret = regulator_ena_gpio_ctrl(rdev, true);
2128 if (ret < 0)
2129 return ret;
2130 rdev->ena_gpio_state = 1;
2131 }
2132 } else if (rdev->desc->ops->enable) {
2133 ret = rdev->desc->ops->enable(rdev);
2134 if (ret < 0)
2135 return ret;
2136 } else {
2137 return -EINVAL;
2138 }
2139
2140 /* Allow the regulator to ramp; it would be useful to extend
2141 * this for bulk operations so that the regulators can ramp
2142 * together. */
2143 trace_regulator_enable_delay(rdev_get_name(rdev));
2144
2145 _regulator_enable_delay(delay);
2146
2147 trace_regulator_enable_complete(rdev_get_name(rdev));
2148
2149 return 0;
2150}
2151
2152/* locks held by regulator_enable() */
2153static int _regulator_enable(struct regulator_dev *rdev)
2154{
2155 int ret;
2156
2157 lockdep_assert_held_once(&rdev->mutex);
2158
2159 /* check voltage and requested load before enabling */
2160 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2161 drms_uA_update(rdev);
2162
2163 if (rdev->use_count == 0) {
2164 /* The regulator may on if it's not switchable or left on */
2165 ret = _regulator_is_enabled(rdev);
2166 if (ret == -EINVAL || ret == 0) {
2167 if (!regulator_ops_is_valid(rdev,
2168 REGULATOR_CHANGE_STATUS))
2169 return -EPERM;
2170
2171 ret = _regulator_do_enable(rdev);
2172 if (ret < 0)
2173 return ret;
2174
2175 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2176 NULL);
2177 } else if (ret < 0) {
2178 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2179 return ret;
2180 }
2181 /* Fallthrough on positive return values - already enabled */
2182 }
2183
2184 rdev->use_count++;
2185
2186 return 0;
2187}
2188
2189/**
2190 * regulator_enable - enable regulator output
2191 * @regulator: regulator source
2192 *
2193 * Request that the regulator be enabled with the regulator output at
2194 * the predefined voltage or current value. Calls to regulator_enable()
2195 * must be balanced with calls to regulator_disable().
2196 *
2197 * NOTE: the output value can be set by other drivers, boot loader or may be
2198 * hardwired in the regulator.
2199 */
2200int regulator_enable(struct regulator *regulator)
2201{
2202 struct regulator_dev *rdev = regulator->rdev;
2203 int ret = 0;
2204
2205 if (regulator->always_on)
2206 return 0;
2207
2208 if (rdev->supply) {
2209 ret = regulator_enable(rdev->supply);
2210 if (ret != 0)
2211 return ret;
2212 }
2213
2214 mutex_lock(&rdev->mutex);
2215 ret = _regulator_enable(rdev);
2216 mutex_unlock(&rdev->mutex);
2217
2218 if (ret != 0 && rdev->supply)
2219 regulator_disable(rdev->supply);
2220
2221 return ret;
2222}
2223EXPORT_SYMBOL_GPL(regulator_enable);
2224
2225static int _regulator_do_disable(struct regulator_dev *rdev)
2226{
2227 int ret;
2228
2229 trace_regulator_disable(rdev_get_name(rdev));
2230
2231 if (rdev->ena_pin) {
2232 if (rdev->ena_gpio_state) {
2233 ret = regulator_ena_gpio_ctrl(rdev, false);
2234 if (ret < 0)
2235 return ret;
2236 rdev->ena_gpio_state = 0;
2237 }
2238
2239 } else if (rdev->desc->ops->disable) {
2240 ret = rdev->desc->ops->disable(rdev);
2241 if (ret != 0)
2242 return ret;
2243 }
2244
2245 /* cares about last_off_jiffy only if off_on_delay is required by
2246 * device.
2247 */
2248 if (rdev->desc->off_on_delay)
2249 rdev->last_off_jiffy = jiffies;
2250
2251 trace_regulator_disable_complete(rdev_get_name(rdev));
2252
2253 return 0;
2254}
2255
2256/* locks held by regulator_disable() */
2257static int _regulator_disable(struct regulator_dev *rdev)
2258{
2259 int ret = 0;
2260
2261 lockdep_assert_held_once(&rdev->mutex);
2262
2263 if (WARN(rdev->use_count <= 0,
2264 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2265 return -EIO;
2266
2267 /* are we the last user and permitted to disable ? */
2268 if (rdev->use_count == 1 &&
2269 (rdev->constraints && !rdev->constraints->always_on)) {
2270
2271 /* we are last user */
2272 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2273 ret = _notifier_call_chain(rdev,
2274 REGULATOR_EVENT_PRE_DISABLE,
2275 NULL);
2276 if (ret & NOTIFY_STOP_MASK)
2277 return -EINVAL;
2278
2279 ret = _regulator_do_disable(rdev);
2280 if (ret < 0) {
2281 rdev_err(rdev, "failed to disable\n");
2282 _notifier_call_chain(rdev,
2283 REGULATOR_EVENT_ABORT_DISABLE,
2284 NULL);
2285 return ret;
2286 }
2287 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2288 NULL);
2289 }
2290
2291 rdev->use_count = 0;
2292 } else if (rdev->use_count > 1) {
2293 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2294 drms_uA_update(rdev);
2295
2296 rdev->use_count--;
2297 }
2298
2299 return ret;
2300}
2301
2302/**
2303 * regulator_disable - disable regulator output
2304 * @regulator: regulator source
2305 *
2306 * Disable the regulator output voltage or current. Calls to
2307 * regulator_enable() must be balanced with calls to
2308 * regulator_disable().
2309 *
2310 * NOTE: this will only disable the regulator output if no other consumer
2311 * devices have it enabled, the regulator device supports disabling and
2312 * machine constraints permit this operation.
2313 */
2314int regulator_disable(struct regulator *regulator)
2315{
2316 struct regulator_dev *rdev = regulator->rdev;
2317 int ret = 0;
2318
2319 if (regulator->always_on)
2320 return 0;
2321
2322 mutex_lock(&rdev->mutex);
2323 ret = _regulator_disable(rdev);
2324 mutex_unlock(&rdev->mutex);
2325
2326 if (ret == 0 && rdev->supply)
2327 regulator_disable(rdev->supply);
2328
2329 return ret;
2330}
2331EXPORT_SYMBOL_GPL(regulator_disable);
2332
2333/* locks held by regulator_force_disable() */
2334static int _regulator_force_disable(struct regulator_dev *rdev)
2335{
2336 int ret = 0;
2337
2338 lockdep_assert_held_once(&rdev->mutex);
2339
2340 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2341 REGULATOR_EVENT_PRE_DISABLE, NULL);
2342 if (ret & NOTIFY_STOP_MASK)
2343 return -EINVAL;
2344
2345 ret = _regulator_do_disable(rdev);
2346 if (ret < 0) {
2347 rdev_err(rdev, "failed to force disable\n");
2348 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2349 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2350 return ret;
2351 }
2352
2353 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2354 REGULATOR_EVENT_DISABLE, NULL);
2355
2356 return 0;
2357}
2358
2359/**
2360 * regulator_force_disable - force disable regulator output
2361 * @regulator: regulator source
2362 *
2363 * Forcibly disable the regulator output voltage or current.
2364 * NOTE: this *will* disable the regulator output even if other consumer
2365 * devices have it enabled. This should be used for situations when device
2366 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2367 */
2368int regulator_force_disable(struct regulator *regulator)
2369{
2370 struct regulator_dev *rdev = regulator->rdev;
2371 int ret;
2372
2373 mutex_lock(&rdev->mutex);
2374 regulator->uA_load = 0;
2375 ret = _regulator_force_disable(regulator->rdev);
2376 mutex_unlock(&rdev->mutex);
2377
2378 if (rdev->supply)
2379 while (rdev->open_count--)
2380 regulator_disable(rdev->supply);
2381
2382 return ret;
2383}
2384EXPORT_SYMBOL_GPL(regulator_force_disable);
2385
2386static void regulator_disable_work(struct work_struct *work)
2387{
2388 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2389 disable_work.work);
2390 int count, i, ret;
2391
2392 mutex_lock(&rdev->mutex);
2393
2394 BUG_ON(!rdev->deferred_disables);
2395
2396 count = rdev->deferred_disables;
2397 rdev->deferred_disables = 0;
2398
2399 for (i = 0; i < count; i++) {
2400 ret = _regulator_disable(rdev);
2401 if (ret != 0)
2402 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2403 }
2404
2405 mutex_unlock(&rdev->mutex);
2406
2407 if (rdev->supply) {
2408 for (i = 0; i < count; i++) {
2409 ret = regulator_disable(rdev->supply);
2410 if (ret != 0) {
2411 rdev_err(rdev,
2412 "Supply disable failed: %d\n", ret);
2413 }
2414 }
2415 }
2416}
2417
2418/**
2419 * regulator_disable_deferred - disable regulator output with delay
2420 * @regulator: regulator source
2421 * @ms: miliseconds until the regulator is disabled
2422 *
2423 * Execute regulator_disable() on the regulator after a delay. This
2424 * is intended for use with devices that require some time to quiesce.
2425 *
2426 * NOTE: this will only disable the regulator output if no other consumer
2427 * devices have it enabled, the regulator device supports disabling and
2428 * machine constraints permit this operation.
2429 */
2430int regulator_disable_deferred(struct regulator *regulator, int ms)
2431{
2432 struct regulator_dev *rdev = regulator->rdev;
2433
2434 if (regulator->always_on)
2435 return 0;
2436
2437 if (!ms)
2438 return regulator_disable(regulator);
2439
2440 mutex_lock(&rdev->mutex);
2441 rdev->deferred_disables++;
2442 mutex_unlock(&rdev->mutex);
2443
2444 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2445 msecs_to_jiffies(ms));
2446 return 0;
2447}
2448EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2449
2450static int _regulator_is_enabled(struct regulator_dev *rdev)
2451{
2452 /* A GPIO control always takes precedence */
2453 if (rdev->ena_pin)
2454 return rdev->ena_gpio_state;
2455
2456 /* If we don't know then assume that the regulator is always on */
2457 if (!rdev->desc->ops->is_enabled)
2458 return 1;
2459
2460 return rdev->desc->ops->is_enabled(rdev);
2461}
2462
2463static int _regulator_list_voltage(struct regulator *regulator,
2464 unsigned selector, int lock)
2465{
2466 struct regulator_dev *rdev = regulator->rdev;
2467 const struct regulator_ops *ops = rdev->desc->ops;
2468 int ret;
2469
2470 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2471 return rdev->desc->fixed_uV;
2472
2473 if (ops->list_voltage) {
2474 if (selector >= rdev->desc->n_voltages)
2475 return -EINVAL;
2476 if (lock)
2477 mutex_lock(&rdev->mutex);
2478 ret = ops->list_voltage(rdev, selector);
2479 if (lock)
2480 mutex_unlock(&rdev->mutex);
2481 } else if (rdev->is_switch && rdev->supply) {
2482 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2483 } else {
2484 return -EINVAL;
2485 }
2486
2487 if (ret > 0) {
2488 if (ret < rdev->constraints->min_uV)
2489 ret = 0;
2490 else if (ret > rdev->constraints->max_uV)
2491 ret = 0;
2492 }
2493
2494 return ret;
2495}
2496
2497/**
2498 * regulator_is_enabled - is the regulator output enabled
2499 * @regulator: regulator source
2500 *
2501 * Returns positive if the regulator driver backing the source/client
2502 * has requested that the device be enabled, zero if it hasn't, else a
2503 * negative errno code.
2504 *
2505 * Note that the device backing this regulator handle can have multiple
2506 * users, so it might be enabled even if regulator_enable() was never
2507 * called for this particular source.
2508 */
2509int regulator_is_enabled(struct regulator *regulator)
2510{
2511 int ret;
2512
2513 if (regulator->always_on)
2514 return 1;
2515
2516 mutex_lock(&regulator->rdev->mutex);
2517 ret = _regulator_is_enabled(regulator->rdev);
2518 mutex_unlock(&regulator->rdev->mutex);
2519
2520 return ret;
2521}
2522EXPORT_SYMBOL_GPL(regulator_is_enabled);
2523
2524/**
2525 * regulator_count_voltages - count regulator_list_voltage() selectors
2526 * @regulator: regulator source
2527 *
2528 * Returns number of selectors, or negative errno. Selectors are
2529 * numbered starting at zero, and typically correspond to bitfields
2530 * in hardware registers.
2531 */
2532int regulator_count_voltages(struct regulator *regulator)
2533{
2534 struct regulator_dev *rdev = regulator->rdev;
2535
2536 if (rdev->desc->n_voltages)
2537 return rdev->desc->n_voltages;
2538
2539 if (!rdev->is_switch || !rdev->supply)
2540 return -EINVAL;
2541
2542 return regulator_count_voltages(rdev->supply);
2543}
2544EXPORT_SYMBOL_GPL(regulator_count_voltages);
2545
2546/**
2547 * regulator_list_voltage - enumerate supported voltages
2548 * @regulator: regulator source
2549 * @selector: identify voltage to list
2550 * Context: can sleep
2551 *
2552 * Returns a voltage that can be passed to @regulator_set_voltage(),
2553 * zero if this selector code can't be used on this system, or a
2554 * negative errno.
2555 */
2556int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2557{
2558 return _regulator_list_voltage(regulator, selector, 1);
2559}
2560EXPORT_SYMBOL_GPL(regulator_list_voltage);
2561
2562/**
2563 * regulator_get_regmap - get the regulator's register map
2564 * @regulator: regulator source
2565 *
2566 * Returns the register map for the given regulator, or an ERR_PTR value
2567 * if the regulator doesn't use regmap.
2568 */
2569struct regmap *regulator_get_regmap(struct regulator *regulator)
2570{
2571 struct regmap *map = regulator->rdev->regmap;
2572
2573 return map ? map : ERR_PTR(-EOPNOTSUPP);
2574}
2575
2576/**
2577 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2578 * @regulator: regulator source
2579 * @vsel_reg: voltage selector register, output parameter
2580 * @vsel_mask: mask for voltage selector bitfield, output parameter
2581 *
2582 * Returns the hardware register offset and bitmask used for setting the
2583 * regulator voltage. This might be useful when configuring voltage-scaling
2584 * hardware or firmware that can make I2C requests behind the kernel's back,
2585 * for example.
2586 *
2587 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2588 * and 0 is returned, otherwise a negative errno is returned.
2589 */
2590int regulator_get_hardware_vsel_register(struct regulator *regulator,
2591 unsigned *vsel_reg,
2592 unsigned *vsel_mask)
2593{
2594 struct regulator_dev *rdev = regulator->rdev;
2595 const struct regulator_ops *ops = rdev->desc->ops;
2596
2597 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2598 return -EOPNOTSUPP;
2599
2600 *vsel_reg = rdev->desc->vsel_reg;
2601 *vsel_mask = rdev->desc->vsel_mask;
2602
2603 return 0;
2604}
2605EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2606
2607/**
2608 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2609 * @regulator: regulator source
2610 * @selector: identify voltage to list
2611 *
2612 * Converts the selector to a hardware-specific voltage selector that can be
2613 * directly written to the regulator registers. The address of the voltage
2614 * register can be determined by calling @regulator_get_hardware_vsel_register.
2615 *
2616 * On error a negative errno is returned.
2617 */
2618int regulator_list_hardware_vsel(struct regulator *regulator,
2619 unsigned selector)
2620{
2621 struct regulator_dev *rdev = regulator->rdev;
2622 const struct regulator_ops *ops = rdev->desc->ops;
2623
2624 if (selector >= rdev->desc->n_voltages)
2625 return -EINVAL;
2626 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2627 return -EOPNOTSUPP;
2628
2629 return selector;
2630}
2631EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2632
2633/**
2634 * regulator_get_linear_step - return the voltage step size between VSEL values
2635 * @regulator: regulator source
2636 *
2637 * Returns the voltage step size between VSEL values for linear
2638 * regulators, or return 0 if the regulator isn't a linear regulator.
2639 */
2640unsigned int regulator_get_linear_step(struct regulator *regulator)
2641{
2642 struct regulator_dev *rdev = regulator->rdev;
2643
2644 return rdev->desc->uV_step;
2645}
2646EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2647
2648/**
2649 * regulator_is_supported_voltage - check if a voltage range can be supported
2650 *
2651 * @regulator: Regulator to check.
2652 * @min_uV: Minimum required voltage in uV.
2653 * @max_uV: Maximum required voltage in uV.
2654 *
2655 * Returns a boolean or a negative error code.
2656 */
2657int regulator_is_supported_voltage(struct regulator *regulator,
2658 int min_uV, int max_uV)
2659{
2660 struct regulator_dev *rdev = regulator->rdev;
2661 int i, voltages, ret;
2662
2663 /* If we can't change voltage check the current voltage */
2664 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2665 ret = regulator_get_voltage(regulator);
2666 if (ret >= 0)
2667 return min_uV <= ret && ret <= max_uV;
2668 else
2669 return ret;
2670 }
2671
2672 /* Any voltage within constrains range is fine? */
2673 if (rdev->desc->continuous_voltage_range)
2674 return min_uV >= rdev->constraints->min_uV &&
2675 max_uV <= rdev->constraints->max_uV;
2676
2677 ret = regulator_count_voltages(regulator);
2678 if (ret < 0)
2679 return ret;
2680 voltages = ret;
2681
2682 for (i = 0; i < voltages; i++) {
2683 ret = regulator_list_voltage(regulator, i);
2684
2685 if (ret >= min_uV && ret <= max_uV)
2686 return 1;
2687 }
2688
2689 return 0;
2690}
2691EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2692
2693static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2694 int max_uV)
2695{
2696 const struct regulator_desc *desc = rdev->desc;
2697
2698 if (desc->ops->map_voltage)
2699 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2700
2701 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2702 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2703
2704 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2705 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2706
2707 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2708}
2709
2710static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2711 int min_uV, int max_uV,
2712 unsigned *selector)
2713{
2714 struct pre_voltage_change_data data;
2715 int ret;
2716
2717 data.old_uV = _regulator_get_voltage(rdev);
2718 data.min_uV = min_uV;
2719 data.max_uV = max_uV;
2720 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2721 &data);
2722 if (ret & NOTIFY_STOP_MASK)
2723 return -EINVAL;
2724
2725 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2726 if (ret >= 0)
2727 return ret;
2728
2729 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2730 (void *)data.old_uV);
2731
2732 return ret;
2733}
2734
2735static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2736 int uV, unsigned selector)
2737{
2738 struct pre_voltage_change_data data;
2739 int ret;
2740
2741 data.old_uV = _regulator_get_voltage(rdev);
2742 data.min_uV = uV;
2743 data.max_uV = uV;
2744 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2745 &data);
2746 if (ret & NOTIFY_STOP_MASK)
2747 return -EINVAL;
2748
2749 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2750 if (ret >= 0)
2751 return ret;
2752
2753 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2754 (void *)data.old_uV);
2755
2756 return ret;
2757}
2758
2759static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2760 int old_uV, int new_uV)
2761{
2762 unsigned int ramp_delay = 0;
2763
2764 if (rdev->constraints->ramp_delay)
2765 ramp_delay = rdev->constraints->ramp_delay;
2766 else if (rdev->desc->ramp_delay)
2767 ramp_delay = rdev->desc->ramp_delay;
2768 else if (rdev->constraints->settling_time)
2769 return rdev->constraints->settling_time;
2770
2771 if (ramp_delay == 0) {
2772 rdev_dbg(rdev, "ramp_delay not set\n");
2773 return 0;
2774 }
2775
2776 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2777}
2778
2779static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2780 int min_uV, int max_uV)
2781{
2782 int ret;
2783 int delay = 0;
2784 int best_val = 0;
2785 unsigned int selector;
2786 int old_selector = -1;
2787 const struct regulator_ops *ops = rdev->desc->ops;
2788 int old_uV = _regulator_get_voltage(rdev);
2789
2790 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2791
2792 min_uV += rdev->constraints->uV_offset;
2793 max_uV += rdev->constraints->uV_offset;
2794
2795 /*
2796 * If we can't obtain the old selector there is not enough
2797 * info to call set_voltage_time_sel().
2798 */
2799 if (_regulator_is_enabled(rdev) &&
2800 ops->set_voltage_time_sel && ops->get_voltage_sel) {
2801 old_selector = ops->get_voltage_sel(rdev);
2802 if (old_selector < 0)
2803 return old_selector;
2804 }
2805
2806 if (ops->set_voltage) {
2807 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2808 &selector);
2809
2810 if (ret >= 0) {
2811 if (ops->list_voltage)
2812 best_val = ops->list_voltage(rdev,
2813 selector);
2814 else
2815 best_val = _regulator_get_voltage(rdev);
2816 }
2817
2818 } else if (ops->set_voltage_sel) {
2819 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2820 if (ret >= 0) {
2821 best_val = ops->list_voltage(rdev, ret);
2822 if (min_uV <= best_val && max_uV >= best_val) {
2823 selector = ret;
2824 if (old_selector == selector)
2825 ret = 0;
2826 else
2827 ret = _regulator_call_set_voltage_sel(
2828 rdev, best_val, selector);
2829 } else {
2830 ret = -EINVAL;
2831 }
2832 }
2833 } else {
2834 ret = -EINVAL;
2835 }
2836
2837 if (ret)
2838 goto out;
2839
2840 if (ops->set_voltage_time_sel) {
2841 /*
2842 * Call set_voltage_time_sel if successfully obtained
2843 * old_selector
2844 */
2845 if (old_selector >= 0 && old_selector != selector)
2846 delay = ops->set_voltage_time_sel(rdev, old_selector,
2847 selector);
2848 } else {
2849 if (old_uV != best_val) {
2850 if (ops->set_voltage_time)
2851 delay = ops->set_voltage_time(rdev, old_uV,
2852 best_val);
2853 else
2854 delay = _regulator_set_voltage_time(rdev,
2855 old_uV,
2856 best_val);
2857 }
2858 }
2859
2860 if (delay < 0) {
2861 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2862 delay = 0;
2863 }
2864
2865 /* Insert any necessary delays */
2866 if (delay >= 1000) {
2867 mdelay(delay / 1000);
2868 udelay(delay % 1000);
2869 } else if (delay) {
2870 udelay(delay);
2871 }
2872
2873 if (best_val >= 0) {
2874 unsigned long data = best_val;
2875
2876 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2877 (void *)data);
2878 }
2879
2880out:
2881 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2882
2883 return ret;
2884}
2885
2886static int regulator_set_voltage_unlocked(struct regulator *regulator,
2887 int min_uV, int max_uV)
2888{
2889 struct regulator_dev *rdev = regulator->rdev;
2890 int ret = 0;
2891 int old_min_uV, old_max_uV;
2892 int current_uV;
2893 int best_supply_uV = 0;
2894 int supply_change_uV = 0;
2895
2896 /* If we're setting the same range as last time the change
2897 * should be a noop (some cpufreq implementations use the same
2898 * voltage for multiple frequencies, for example).
2899 */
2900 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2901 goto out;
2902
2903 /* If we're trying to set a range that overlaps the current voltage,
2904 * return successfully even though the regulator does not support
2905 * changing the voltage.
2906 */
2907 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2908 current_uV = _regulator_get_voltage(rdev);
2909 if (min_uV <= current_uV && current_uV <= max_uV) {
2910 regulator->min_uV = min_uV;
2911 regulator->max_uV = max_uV;
2912 goto out;
2913 }
2914 }
2915
2916 /* sanity check */
2917 if (!rdev->desc->ops->set_voltage &&
2918 !rdev->desc->ops->set_voltage_sel) {
2919 ret = -EINVAL;
2920 goto out;
2921 }
2922
2923 /* constraints check */
2924 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2925 if (ret < 0)
2926 goto out;
2927
2928 /* restore original values in case of error */
2929 old_min_uV = regulator->min_uV;
2930 old_max_uV = regulator->max_uV;
2931 regulator->min_uV = min_uV;
2932 regulator->max_uV = max_uV;
2933
2934 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2935 if (ret < 0)
2936 goto out2;
2937
2938 if (rdev->supply &&
2939 regulator_ops_is_valid(rdev->supply->rdev,
2940 REGULATOR_CHANGE_VOLTAGE) &&
2941 (rdev->desc->min_dropout_uV || !rdev->desc->ops->get_voltage)) {
2942 int current_supply_uV;
2943 int selector;
2944
2945 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2946 if (selector < 0) {
2947 ret = selector;
2948 goto out2;
2949 }
2950
2951 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2952 if (best_supply_uV < 0) {
2953 ret = best_supply_uV;
2954 goto out2;
2955 }
2956
2957 best_supply_uV += rdev->desc->min_dropout_uV;
2958
2959 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2960 if (current_supply_uV < 0) {
2961 ret = current_supply_uV;
2962 goto out2;
2963 }
2964
2965 supply_change_uV = best_supply_uV - current_supply_uV;
2966 }
2967
2968 if (supply_change_uV > 0) {
2969 ret = regulator_set_voltage_unlocked(rdev->supply,
2970 best_supply_uV, INT_MAX);
2971 if (ret) {
2972 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2973 ret);
2974 goto out2;
2975 }
2976 }
2977
2978 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2979 if (ret < 0)
2980 goto out2;
2981
2982 if (supply_change_uV < 0) {
2983 ret = regulator_set_voltage_unlocked(rdev->supply,
2984 best_supply_uV, INT_MAX);
2985 if (ret)
2986 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2987 ret);
2988 /* No need to fail here */
2989 ret = 0;
2990 }
2991
2992out:
2993 return ret;
2994out2:
2995 regulator->min_uV = old_min_uV;
2996 regulator->max_uV = old_max_uV;
2997
2998 return ret;
2999}
3000
3001/**
3002 * regulator_set_voltage - set regulator output voltage
3003 * @regulator: regulator source
3004 * @min_uV: Minimum required voltage in uV
3005 * @max_uV: Maximum acceptable voltage in uV
3006 *
3007 * Sets a voltage regulator to the desired output voltage. This can be set
3008 * during any regulator state. IOW, regulator can be disabled or enabled.
3009 *
3010 * If the regulator is enabled then the voltage will change to the new value
3011 * immediately otherwise if the regulator is disabled the regulator will
3012 * output at the new voltage when enabled.
3013 *
3014 * NOTE: If the regulator is shared between several devices then the lowest
3015 * request voltage that meets the system constraints will be used.
3016 * Regulator system constraints must be set for this regulator before
3017 * calling this function otherwise this call will fail.
3018 */
3019int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3020{
3021 int ret = 0;
3022
3023 regulator_lock_supply(regulator->rdev);
3024
3025 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
3026
3027 regulator_unlock_supply(regulator->rdev);
3028
3029 return ret;
3030}
3031EXPORT_SYMBOL_GPL(regulator_set_voltage);
3032
3033/**
3034 * regulator_set_voltage_time - get raise/fall time
3035 * @regulator: regulator source
3036 * @old_uV: starting voltage in microvolts
3037 * @new_uV: target voltage in microvolts
3038 *
3039 * Provided with the starting and ending voltage, this function attempts to
3040 * calculate the time in microseconds required to rise or fall to this new
3041 * voltage.
3042 */
3043int regulator_set_voltage_time(struct regulator *regulator,
3044 int old_uV, int new_uV)
3045{
3046 struct regulator_dev *rdev = regulator->rdev;
3047 const struct regulator_ops *ops = rdev->desc->ops;
3048 int old_sel = -1;
3049 int new_sel = -1;
3050 int voltage;
3051 int i;
3052
3053 if (ops->set_voltage_time)
3054 return ops->set_voltage_time(rdev, old_uV, new_uV);
3055 else if (!ops->set_voltage_time_sel)
3056 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3057
3058 /* Currently requires operations to do this */
3059 if (!ops->list_voltage || !rdev->desc->n_voltages)
3060 return -EINVAL;
3061
3062 for (i = 0; i < rdev->desc->n_voltages; i++) {
3063 /* We only look for exact voltage matches here */
3064 voltage = regulator_list_voltage(regulator, i);
3065 if (voltage < 0)
3066 return -EINVAL;
3067 if (voltage == 0)
3068 continue;
3069 if (voltage == old_uV)
3070 old_sel = i;
3071 if (voltage == new_uV)
3072 new_sel = i;
3073 }
3074
3075 if (old_sel < 0 || new_sel < 0)
3076 return -EINVAL;
3077
3078 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3079}
3080EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3081
3082/**
3083 * regulator_set_voltage_time_sel - get raise/fall time
3084 * @rdev: regulator source device
3085 * @old_selector: selector for starting voltage
3086 * @new_selector: selector for target voltage
3087 *
3088 * Provided with the starting and target voltage selectors, this function
3089 * returns time in microseconds required to rise or fall to this new voltage
3090 *
3091 * Drivers providing ramp_delay in regulation_constraints can use this as their
3092 * set_voltage_time_sel() operation.
3093 */
3094int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3095 unsigned int old_selector,
3096 unsigned int new_selector)
3097{
3098 int old_volt, new_volt;
3099
3100 /* sanity check */
3101 if (!rdev->desc->ops->list_voltage)
3102 return -EINVAL;
3103
3104 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3105 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3106
3107 if (rdev->desc->ops->set_voltage_time)
3108 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3109 new_volt);
3110 else
3111 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3112}
3113EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3114
3115/**
3116 * regulator_sync_voltage - re-apply last regulator output voltage
3117 * @regulator: regulator source
3118 *
3119 * Re-apply the last configured voltage. This is intended to be used
3120 * where some external control source the consumer is cooperating with
3121 * has caused the configured voltage to change.
3122 */
3123int regulator_sync_voltage(struct regulator *regulator)
3124{
3125 struct regulator_dev *rdev = regulator->rdev;
3126 int ret, min_uV, max_uV;
3127
3128 mutex_lock(&rdev->mutex);
3129
3130 if (!rdev->desc->ops->set_voltage &&
3131 !rdev->desc->ops->set_voltage_sel) {
3132 ret = -EINVAL;
3133 goto out;
3134 }
3135
3136 /* This is only going to work if we've had a voltage configured. */
3137 if (!regulator->min_uV && !regulator->max_uV) {
3138 ret = -EINVAL;
3139 goto out;
3140 }
3141
3142 min_uV = regulator->min_uV;
3143 max_uV = regulator->max_uV;
3144
3145 /* This should be a paranoia check... */
3146 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3147 if (ret < 0)
3148 goto out;
3149
3150 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3151 if (ret < 0)
3152 goto out;
3153
3154 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3155
3156out:
3157 mutex_unlock(&rdev->mutex);
3158 return ret;
3159}
3160EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3161
3162static int _regulator_get_voltage(struct regulator_dev *rdev)
3163{
3164 int sel, ret;
3165 bool bypassed;
3166
3167 if (rdev->desc->ops->get_bypass) {
3168 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3169 if (ret < 0)
3170 return ret;
3171 if (bypassed) {
3172 /* if bypassed the regulator must have a supply */
3173 if (!rdev->supply) {
3174 rdev_err(rdev,
3175 "bypassed regulator has no supply!\n");
3176 return -EPROBE_DEFER;
3177 }
3178
3179 return _regulator_get_voltage(rdev->supply->rdev);
3180 }
3181 }
3182
3183 if (rdev->desc->ops->get_voltage_sel) {
3184 sel = rdev->desc->ops->get_voltage_sel(rdev);
3185 if (sel < 0)
3186 return sel;
3187 ret = rdev->desc->ops->list_voltage(rdev, sel);
3188 } else if (rdev->desc->ops->get_voltage) {
3189 ret = rdev->desc->ops->get_voltage(rdev);
3190 } else if (rdev->desc->ops->list_voltage) {
3191 ret = rdev->desc->ops->list_voltage(rdev, 0);
3192 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3193 ret = rdev->desc->fixed_uV;
3194 } else if (rdev->supply) {
3195 ret = _regulator_get_voltage(rdev->supply->rdev);
3196 } else {
3197 return -EINVAL;
3198 }
3199
3200 if (ret < 0)
3201 return ret;
3202 return ret - rdev->constraints->uV_offset;
3203}
3204
3205/**
3206 * regulator_get_voltage - get regulator output voltage
3207 * @regulator: regulator source
3208 *
3209 * This returns the current regulator voltage in uV.
3210 *
3211 * NOTE: If the regulator is disabled it will return the voltage value. This
3212 * function should not be used to determine regulator state.
3213 */
3214int regulator_get_voltage(struct regulator *regulator)
3215{
3216 int ret;
3217
3218 regulator_lock_supply(regulator->rdev);
3219
3220 ret = _regulator_get_voltage(regulator->rdev);
3221
3222 regulator_unlock_supply(regulator->rdev);
3223
3224 return ret;
3225}
3226EXPORT_SYMBOL_GPL(regulator_get_voltage);
3227
3228/**
3229 * regulator_set_current_limit - set regulator output current limit
3230 * @regulator: regulator source
3231 * @min_uA: Minimum supported current in uA
3232 * @max_uA: Maximum supported current in uA
3233 *
3234 * Sets current sink to the desired output current. This can be set during
3235 * any regulator state. IOW, regulator can be disabled or enabled.
3236 *
3237 * If the regulator is enabled then the current will change to the new value
3238 * immediately otherwise if the regulator is disabled the regulator will
3239 * output at the new current when enabled.
3240 *
3241 * NOTE: Regulator system constraints must be set for this regulator before
3242 * calling this function otherwise this call will fail.
3243 */
3244int regulator_set_current_limit(struct regulator *regulator,
3245 int min_uA, int max_uA)
3246{
3247 struct regulator_dev *rdev = regulator->rdev;
3248 int ret;
3249
3250 mutex_lock(&rdev->mutex);
3251
3252 /* sanity check */
3253 if (!rdev->desc->ops->set_current_limit) {
3254 ret = -EINVAL;
3255 goto out;
3256 }
3257
3258 /* constraints check */
3259 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3260 if (ret < 0)
3261 goto out;
3262
3263 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3264out:
3265 mutex_unlock(&rdev->mutex);
3266 return ret;
3267}
3268EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3269
3270static int _regulator_get_current_limit(struct regulator_dev *rdev)
3271{
3272 int ret;
3273
3274 mutex_lock(&rdev->mutex);
3275
3276 /* sanity check */
3277 if (!rdev->desc->ops->get_current_limit) {
3278 ret = -EINVAL;
3279 goto out;
3280 }
3281
3282 ret = rdev->desc->ops->get_current_limit(rdev);
3283out:
3284 mutex_unlock(&rdev->mutex);
3285 return ret;
3286}
3287
3288/**
3289 * regulator_get_current_limit - get regulator output current
3290 * @regulator: regulator source
3291 *
3292 * This returns the current supplied by the specified current sink in uA.
3293 *
3294 * NOTE: If the regulator is disabled it will return the current value. This
3295 * function should not be used to determine regulator state.
3296 */
3297int regulator_get_current_limit(struct regulator *regulator)
3298{
3299 return _regulator_get_current_limit(regulator->rdev);
3300}
3301EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3302
3303/**
3304 * regulator_set_mode - set regulator operating mode
3305 * @regulator: regulator source
3306 * @mode: operating mode - one of the REGULATOR_MODE constants
3307 *
3308 * Set regulator operating mode to increase regulator efficiency or improve
3309 * regulation performance.
3310 *
3311 * NOTE: Regulator system constraints must be set for this regulator before
3312 * calling this function otherwise this call will fail.
3313 */
3314int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3315{
3316 struct regulator_dev *rdev = regulator->rdev;
3317 int ret;
3318 int regulator_curr_mode;
3319
3320 mutex_lock(&rdev->mutex);
3321
3322 /* sanity check */
3323 if (!rdev->desc->ops->set_mode) {
3324 ret = -EINVAL;
3325 goto out;
3326 }
3327
3328 /* return if the same mode is requested */
3329 if (rdev->desc->ops->get_mode) {
3330 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3331 if (regulator_curr_mode == mode) {
3332 ret = 0;
3333 goto out;
3334 }
3335 }
3336
3337 /* constraints check */
3338 ret = regulator_mode_constrain(rdev, &mode);
3339 if (ret < 0)
3340 goto out;
3341
3342 ret = rdev->desc->ops->set_mode(rdev, mode);
3343out:
3344 mutex_unlock(&rdev->mutex);
3345 return ret;
3346}
3347EXPORT_SYMBOL_GPL(regulator_set_mode);
3348
3349static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3350{
3351 int ret;
3352
3353 mutex_lock(&rdev->mutex);
3354
3355 /* sanity check */
3356 if (!rdev->desc->ops->get_mode) {
3357 ret = -EINVAL;
3358 goto out;
3359 }
3360
3361 ret = rdev->desc->ops->get_mode(rdev);
3362out:
3363 mutex_unlock(&rdev->mutex);
3364 return ret;
3365}
3366
3367/**
3368 * regulator_get_mode - get regulator operating mode
3369 * @regulator: regulator source
3370 *
3371 * Get the current regulator operating mode.
3372 */
3373unsigned int regulator_get_mode(struct regulator *regulator)
3374{
3375 return _regulator_get_mode(regulator->rdev);
3376}
3377EXPORT_SYMBOL_GPL(regulator_get_mode);
3378
3379static int _regulator_get_error_flags(struct regulator_dev *rdev,
3380 unsigned int *flags)
3381{
3382 int ret;
3383
3384 mutex_lock(&rdev->mutex);
3385
3386 /* sanity check */
3387 if (!rdev->desc->ops->get_error_flags) {
3388 ret = -EINVAL;
3389 goto out;
3390 }
3391
3392 ret = rdev->desc->ops->get_error_flags(rdev, flags);
3393out:
3394 mutex_unlock(&rdev->mutex);
3395 return ret;
3396}
3397
3398/**
3399 * regulator_get_error_flags - get regulator error information
3400 * @regulator: regulator source
3401 * @flags: pointer to store error flags
3402 *
3403 * Get the current regulator error information.
3404 */
3405int regulator_get_error_flags(struct regulator *regulator,
3406 unsigned int *flags)
3407{
3408 return _regulator_get_error_flags(regulator->rdev, flags);
3409}
3410EXPORT_SYMBOL_GPL(regulator_get_error_flags);
3411
3412/**
3413 * regulator_set_load - set regulator load
3414 * @regulator: regulator source
3415 * @uA_load: load current
3416 *
3417 * Notifies the regulator core of a new device load. This is then used by
3418 * DRMS (if enabled by constraints) to set the most efficient regulator
3419 * operating mode for the new regulator loading.
3420 *
3421 * Consumer devices notify their supply regulator of the maximum power
3422 * they will require (can be taken from device datasheet in the power
3423 * consumption tables) when they change operational status and hence power
3424 * state. Examples of operational state changes that can affect power
3425 * consumption are :-
3426 *
3427 * o Device is opened / closed.
3428 * o Device I/O is about to begin or has just finished.
3429 * o Device is idling in between work.
3430 *
3431 * This information is also exported via sysfs to userspace.
3432 *
3433 * DRMS will sum the total requested load on the regulator and change
3434 * to the most efficient operating mode if platform constraints allow.
3435 *
3436 * On error a negative errno is returned.
3437 */
3438int regulator_set_load(struct regulator *regulator, int uA_load)
3439{
3440 struct regulator_dev *rdev = regulator->rdev;
3441 int ret;
3442
3443 mutex_lock(&rdev->mutex);
3444 regulator->uA_load = uA_load;
3445 ret = drms_uA_update(rdev);
3446 mutex_unlock(&rdev->mutex);
3447
3448 return ret;
3449}
3450EXPORT_SYMBOL_GPL(regulator_set_load);
3451
3452/**
3453 * regulator_allow_bypass - allow the regulator to go into bypass mode
3454 *
3455 * @regulator: Regulator to configure
3456 * @enable: enable or disable bypass mode
3457 *
3458 * Allow the regulator to go into bypass mode if all other consumers
3459 * for the regulator also enable bypass mode and the machine
3460 * constraints allow this. Bypass mode means that the regulator is
3461 * simply passing the input directly to the output with no regulation.
3462 */
3463int regulator_allow_bypass(struct regulator *regulator, bool enable)
3464{
3465 struct regulator_dev *rdev = regulator->rdev;
3466 int ret = 0;
3467
3468 if (!rdev->desc->ops->set_bypass)
3469 return 0;
3470
3471 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3472 return 0;
3473
3474 mutex_lock(&rdev->mutex);
3475
3476 if (enable && !regulator->bypass) {
3477 rdev->bypass_count++;
3478
3479 if (rdev->bypass_count == rdev->open_count) {
3480 ret = rdev->desc->ops->set_bypass(rdev, enable);
3481 if (ret != 0)
3482 rdev->bypass_count--;
3483 }
3484
3485 } else if (!enable && regulator->bypass) {
3486 rdev->bypass_count--;
3487
3488 if (rdev->bypass_count != rdev->open_count) {
3489 ret = rdev->desc->ops->set_bypass(rdev, enable);
3490 if (ret != 0)
3491 rdev->bypass_count++;
3492 }
3493 }
3494
3495 if (ret == 0)
3496 regulator->bypass = enable;
3497
3498 mutex_unlock(&rdev->mutex);
3499
3500 return ret;
3501}
3502EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3503
3504/**
3505 * regulator_register_notifier - register regulator event notifier
3506 * @regulator: regulator source
3507 * @nb: notifier block
3508 *
3509 * Register notifier block to receive regulator events.
3510 */
3511int regulator_register_notifier(struct regulator *regulator,
3512 struct notifier_block *nb)
3513{
3514 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3515 nb);
3516}
3517EXPORT_SYMBOL_GPL(regulator_register_notifier);
3518
3519/**
3520 * regulator_unregister_notifier - unregister regulator event notifier
3521 * @regulator: regulator source
3522 * @nb: notifier block
3523 *
3524 * Unregister regulator event notifier block.
3525 */
3526int regulator_unregister_notifier(struct regulator *regulator,
3527 struct notifier_block *nb)
3528{
3529 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3530 nb);
3531}
3532EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3533
3534/* notify regulator consumers and downstream regulator consumers.
3535 * Note mutex must be held by caller.
3536 */
3537static int _notifier_call_chain(struct regulator_dev *rdev,
3538 unsigned long event, void *data)
3539{
3540 /* call rdev chain first */
3541 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3542}
3543
3544/**
3545 * regulator_bulk_get - get multiple regulator consumers
3546 *
3547 * @dev: Device to supply
3548 * @num_consumers: Number of consumers to register
3549 * @consumers: Configuration of consumers; clients are stored here.
3550 *
3551 * @return 0 on success, an errno on failure.
3552 *
3553 * This helper function allows drivers to get several regulator
3554 * consumers in one operation. If any of the regulators cannot be
3555 * acquired then any regulators that were allocated will be freed
3556 * before returning to the caller.
3557 */
3558int regulator_bulk_get(struct device *dev, int num_consumers,
3559 struct regulator_bulk_data *consumers)
3560{
3561 int i;
3562 int ret;
3563
3564 for (i = 0; i < num_consumers; i++)
3565 consumers[i].consumer = NULL;
3566
3567 for (i = 0; i < num_consumers; i++) {
3568 consumers[i].consumer = regulator_get(dev,
3569 consumers[i].supply);
3570 if (IS_ERR(consumers[i].consumer)) {
3571 ret = PTR_ERR(consumers[i].consumer);
3572 dev_err(dev, "Failed to get supply '%s': %d\n",
3573 consumers[i].supply, ret);
3574 consumers[i].consumer = NULL;
3575 goto err;
3576 }
3577 }
3578
3579 return 0;
3580
3581err:
3582 while (--i >= 0)
3583 regulator_put(consumers[i].consumer);
3584
3585 return ret;
3586}
3587EXPORT_SYMBOL_GPL(regulator_bulk_get);
3588
3589static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3590{
3591 struct regulator_bulk_data *bulk = data;
3592
3593 bulk->ret = regulator_enable(bulk->consumer);
3594}
3595
3596/**
3597 * regulator_bulk_enable - enable multiple regulator consumers
3598 *
3599 * @num_consumers: Number of consumers
3600 * @consumers: Consumer data; clients are stored here.
3601 * @return 0 on success, an errno on failure
3602 *
3603 * This convenience API allows consumers to enable multiple regulator
3604 * clients in a single API call. If any consumers cannot be enabled
3605 * then any others that were enabled will be disabled again prior to
3606 * return.
3607 */
3608int regulator_bulk_enable(int num_consumers,
3609 struct regulator_bulk_data *consumers)
3610{
3611 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3612 int i;
3613 int ret = 0;
3614
3615 for (i = 0; i < num_consumers; i++) {
3616 if (consumers[i].consumer->always_on)
3617 consumers[i].ret = 0;
3618 else
3619 async_schedule_domain(regulator_bulk_enable_async,
3620 &consumers[i], &async_domain);
3621 }
3622
3623 async_synchronize_full_domain(&async_domain);
3624
3625 /* If any consumer failed we need to unwind any that succeeded */
3626 for (i = 0; i < num_consumers; i++) {
3627 if (consumers[i].ret != 0) {
3628 ret = consumers[i].ret;
3629 goto err;
3630 }
3631 }
3632
3633 return 0;
3634
3635err:
3636 for (i = 0; i < num_consumers; i++) {
3637 if (consumers[i].ret < 0)
3638 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3639 consumers[i].ret);
3640 else
3641 regulator_disable(consumers[i].consumer);
3642 }
3643
3644 return ret;
3645}
3646EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3647
3648/**
3649 * regulator_bulk_disable - disable multiple regulator consumers
3650 *
3651 * @num_consumers: Number of consumers
3652 * @consumers: Consumer data; clients are stored here.
3653 * @return 0 on success, an errno on failure
3654 *
3655 * This convenience API allows consumers to disable multiple regulator
3656 * clients in a single API call. If any consumers cannot be disabled
3657 * then any others that were disabled will be enabled again prior to
3658 * return.
3659 */
3660int regulator_bulk_disable(int num_consumers,
3661 struct regulator_bulk_data *consumers)
3662{
3663 int i;
3664 int ret, r;
3665
3666 for (i = num_consumers - 1; i >= 0; --i) {
3667 ret = regulator_disable(consumers[i].consumer);
3668 if (ret != 0)
3669 goto err;
3670 }
3671
3672 return 0;
3673
3674err:
3675 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3676 for (++i; i < num_consumers; ++i) {
3677 r = regulator_enable(consumers[i].consumer);
3678 if (r != 0)
3679 pr_err("Failed to re-enable %s: %d\n",
3680 consumers[i].supply, r);
3681 }
3682
3683 return ret;
3684}
3685EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3686
3687/**
3688 * regulator_bulk_force_disable - force disable multiple regulator consumers
3689 *
3690 * @num_consumers: Number of consumers
3691 * @consumers: Consumer data; clients are stored here.
3692 * @return 0 on success, an errno on failure
3693 *
3694 * This convenience API allows consumers to forcibly disable multiple regulator
3695 * clients in a single API call.
3696 * NOTE: This should be used for situations when device damage will
3697 * likely occur if the regulators are not disabled (e.g. over temp).
3698 * Although regulator_force_disable function call for some consumers can
3699 * return error numbers, the function is called for all consumers.
3700 */
3701int regulator_bulk_force_disable(int num_consumers,
3702 struct regulator_bulk_data *consumers)
3703{
3704 int i;
3705 int ret = 0;
3706
3707 for (i = 0; i < num_consumers; i++) {
3708 consumers[i].ret =
3709 regulator_force_disable(consumers[i].consumer);
3710
3711 /* Store first error for reporting */
3712 if (consumers[i].ret && !ret)
3713 ret = consumers[i].ret;
3714 }
3715
3716 return ret;
3717}
3718EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3719
3720/**
3721 * regulator_bulk_free - free multiple regulator consumers
3722 *
3723 * @num_consumers: Number of consumers
3724 * @consumers: Consumer data; clients are stored here.
3725 *
3726 * This convenience API allows consumers to free multiple regulator
3727 * clients in a single API call.
3728 */
3729void regulator_bulk_free(int num_consumers,
3730 struct regulator_bulk_data *consumers)
3731{
3732 int i;
3733
3734 for (i = 0; i < num_consumers; i++) {
3735 regulator_put(consumers[i].consumer);
3736 consumers[i].consumer = NULL;
3737 }
3738}
3739EXPORT_SYMBOL_GPL(regulator_bulk_free);
3740
3741/**
3742 * regulator_notifier_call_chain - call regulator event notifier
3743 * @rdev: regulator source
3744 * @event: notifier block
3745 * @data: callback-specific data.
3746 *
3747 * Called by regulator drivers to notify clients a regulator event has
3748 * occurred. We also notify regulator clients downstream.
3749 * Note lock must be held by caller.
3750 */
3751int regulator_notifier_call_chain(struct regulator_dev *rdev,
3752 unsigned long event, void *data)
3753{
3754 lockdep_assert_held_once(&rdev->mutex);
3755
3756 _notifier_call_chain(rdev, event, data);
3757 return NOTIFY_DONE;
3758
3759}
3760EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3761
3762/**
3763 * regulator_mode_to_status - convert a regulator mode into a status
3764 *
3765 * @mode: Mode to convert
3766 *
3767 * Convert a regulator mode into a status.
3768 */
3769int regulator_mode_to_status(unsigned int mode)
3770{
3771 switch (mode) {
3772 case REGULATOR_MODE_FAST:
3773 return REGULATOR_STATUS_FAST;
3774 case REGULATOR_MODE_NORMAL:
3775 return REGULATOR_STATUS_NORMAL;
3776 case REGULATOR_MODE_IDLE:
3777 return REGULATOR_STATUS_IDLE;
3778 case REGULATOR_MODE_STANDBY:
3779 return REGULATOR_STATUS_STANDBY;
3780 default:
3781 return REGULATOR_STATUS_UNDEFINED;
3782 }
3783}
3784EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3785
3786static struct attribute *regulator_dev_attrs[] = {
3787 &dev_attr_name.attr,
3788 &dev_attr_num_users.attr,
3789 &dev_attr_type.attr,
3790 &dev_attr_microvolts.attr,
3791 &dev_attr_microamps.attr,
3792 &dev_attr_opmode.attr,
3793 &dev_attr_state.attr,
3794 &dev_attr_status.attr,
3795 &dev_attr_bypass.attr,
3796 &dev_attr_requested_microamps.attr,
3797 &dev_attr_min_microvolts.attr,
3798 &dev_attr_max_microvolts.attr,
3799 &dev_attr_min_microamps.attr,
3800 &dev_attr_max_microamps.attr,
3801 &dev_attr_suspend_standby_state.attr,
3802 &dev_attr_suspend_mem_state.attr,
3803 &dev_attr_suspend_disk_state.attr,
3804 &dev_attr_suspend_standby_microvolts.attr,
3805 &dev_attr_suspend_mem_microvolts.attr,
3806 &dev_attr_suspend_disk_microvolts.attr,
3807 &dev_attr_suspend_standby_mode.attr,
3808 &dev_attr_suspend_mem_mode.attr,
3809 &dev_attr_suspend_disk_mode.attr,
3810 NULL
3811};
3812
3813/*
3814 * To avoid cluttering sysfs (and memory) with useless state, only
3815 * create attributes that can be meaningfully displayed.
3816 */
3817static umode_t regulator_attr_is_visible(struct kobject *kobj,
3818 struct attribute *attr, int idx)
3819{
3820 struct device *dev = kobj_to_dev(kobj);
3821 struct regulator_dev *rdev = dev_to_rdev(dev);
3822 const struct regulator_ops *ops = rdev->desc->ops;
3823 umode_t mode = attr->mode;
3824
3825 /* these three are always present */
3826 if (attr == &dev_attr_name.attr ||
3827 attr == &dev_attr_num_users.attr ||
3828 attr == &dev_attr_type.attr)
3829 return mode;
3830
3831 /* some attributes need specific methods to be displayed */
3832 if (attr == &dev_attr_microvolts.attr) {
3833 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3834 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3835 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3836 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3837 return mode;
3838 return 0;
3839 }
3840
3841 if (attr == &dev_attr_microamps.attr)
3842 return ops->get_current_limit ? mode : 0;
3843
3844 if (attr == &dev_attr_opmode.attr)
3845 return ops->get_mode ? mode : 0;
3846
3847 if (attr == &dev_attr_state.attr)
3848 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3849
3850 if (attr == &dev_attr_status.attr)
3851 return ops->get_status ? mode : 0;
3852
3853 if (attr == &dev_attr_bypass.attr)
3854 return ops->get_bypass ? mode : 0;
3855
3856 /* some attributes are type-specific */
3857 if (attr == &dev_attr_requested_microamps.attr)
3858 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3859
3860 /* constraints need specific supporting methods */
3861 if (attr == &dev_attr_min_microvolts.attr ||
3862 attr == &dev_attr_max_microvolts.attr)
3863 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3864
3865 if (attr == &dev_attr_min_microamps.attr ||
3866 attr == &dev_attr_max_microamps.attr)
3867 return ops->set_current_limit ? mode : 0;
3868
3869 if (attr == &dev_attr_suspend_standby_state.attr ||
3870 attr == &dev_attr_suspend_mem_state.attr ||
3871 attr == &dev_attr_suspend_disk_state.attr)
3872 return mode;
3873
3874 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3875 attr == &dev_attr_suspend_mem_microvolts.attr ||
3876 attr == &dev_attr_suspend_disk_microvolts.attr)
3877 return ops->set_suspend_voltage ? mode : 0;
3878
3879 if (attr == &dev_attr_suspend_standby_mode.attr ||
3880 attr == &dev_attr_suspend_mem_mode.attr ||
3881 attr == &dev_attr_suspend_disk_mode.attr)
3882 return ops->set_suspend_mode ? mode : 0;
3883
3884 return mode;
3885}
3886
3887static const struct attribute_group regulator_dev_group = {
3888 .attrs = regulator_dev_attrs,
3889 .is_visible = regulator_attr_is_visible,
3890};
3891
3892static const struct attribute_group *regulator_dev_groups[] = {
3893 &regulator_dev_group,
3894 NULL
3895};
3896
3897static void regulator_dev_release(struct device *dev)
3898{
3899 struct regulator_dev *rdev = dev_get_drvdata(dev);
3900
3901 kfree(rdev->constraints);
3902 of_node_put(rdev->dev.of_node);
3903 kfree(rdev);
3904}
3905
3906static struct class regulator_class = {
3907 .name = "regulator",
3908 .dev_release = regulator_dev_release,
3909 .dev_groups = regulator_dev_groups,
3910};
3911
3912static void rdev_init_debugfs(struct regulator_dev *rdev)
3913{
3914 struct device *parent = rdev->dev.parent;
3915 const char *rname = rdev_get_name(rdev);
3916 char name[NAME_MAX];
3917
3918 /* Avoid duplicate debugfs directory names */
3919 if (parent && rname == rdev->desc->name) {
3920 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3921 rname);
3922 rname = name;
3923 }
3924
3925 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3926 if (!rdev->debugfs) {
3927 rdev_warn(rdev, "Failed to create debugfs directory\n");
3928 return;
3929 }
3930
3931 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3932 &rdev->use_count);
3933 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3934 &rdev->open_count);
3935 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3936 &rdev->bypass_count);
3937}
3938
3939static int regulator_register_resolve_supply(struct device *dev, void *data)
3940{
3941 struct regulator_dev *rdev = dev_to_rdev(dev);
3942
3943 if (regulator_resolve_supply(rdev))
3944 rdev_dbg(rdev, "unable to resolve supply\n");
3945
3946 return 0;
3947}
3948
3949/**
3950 * regulator_register - register regulator
3951 * @regulator_desc: regulator to register
3952 * @cfg: runtime configuration for regulator
3953 *
3954 * Called by regulator drivers to register a regulator.
3955 * Returns a valid pointer to struct regulator_dev on success
3956 * or an ERR_PTR() on error.
3957 */
3958struct regulator_dev *
3959regulator_register(const struct regulator_desc *regulator_desc,
3960 const struct regulator_config *cfg)
3961{
3962 const struct regulation_constraints *constraints = NULL;
3963 const struct regulator_init_data *init_data;
3964 struct regulator_config *config = NULL;
3965 static atomic_t regulator_no = ATOMIC_INIT(-1);
3966 struct regulator_dev *rdev;
3967 struct device *dev;
3968 int ret, i;
3969
3970 if (regulator_desc == NULL || cfg == NULL)
3971 return ERR_PTR(-EINVAL);
3972
3973 dev = cfg->dev;
3974 WARN_ON(!dev);
3975
3976 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3977 return ERR_PTR(-EINVAL);
3978
3979 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3980 regulator_desc->type != REGULATOR_CURRENT)
3981 return ERR_PTR(-EINVAL);
3982
3983 /* Only one of each should be implemented */
3984 WARN_ON(regulator_desc->ops->get_voltage &&
3985 regulator_desc->ops->get_voltage_sel);
3986 WARN_ON(regulator_desc->ops->set_voltage &&
3987 regulator_desc->ops->set_voltage_sel);
3988
3989 /* If we're using selectors we must implement list_voltage. */
3990 if (regulator_desc->ops->get_voltage_sel &&
3991 !regulator_desc->ops->list_voltage) {
3992 return ERR_PTR(-EINVAL);
3993 }
3994 if (regulator_desc->ops->set_voltage_sel &&
3995 !regulator_desc->ops->list_voltage) {
3996 return ERR_PTR(-EINVAL);
3997 }
3998
3999 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4000 if (rdev == NULL)
4001 return ERR_PTR(-ENOMEM);
4002
4003 /*
4004 * Duplicate the config so the driver could override it after
4005 * parsing init data.
4006 */
4007 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4008 if (config == NULL) {
4009 kfree(rdev);
4010 return ERR_PTR(-ENOMEM);
4011 }
4012
4013 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4014 &rdev->dev.of_node);
4015 if (!init_data) {
4016 init_data = config->init_data;
4017 rdev->dev.of_node = of_node_get(config->of_node);
4018 }
4019
4020 mutex_init(&rdev->mutex);
4021 rdev->reg_data = config->driver_data;
4022 rdev->owner = regulator_desc->owner;
4023 rdev->desc = regulator_desc;
4024 if (config->regmap)
4025 rdev->regmap = config->regmap;
4026 else if (dev_get_regmap(dev, NULL))
4027 rdev->regmap = dev_get_regmap(dev, NULL);
4028 else if (dev->parent)
4029 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4030 INIT_LIST_HEAD(&rdev->consumer_list);
4031 INIT_LIST_HEAD(&rdev->list);
4032 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4033 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4034
4035 /* preform any regulator specific init */
4036 if (init_data && init_data->regulator_init) {
4037 ret = init_data->regulator_init(rdev->reg_data);
4038 if (ret < 0)
4039 goto clean;
4040 }
4041
4042 if ((config->ena_gpio || config->ena_gpio_initialized) &&
4043 gpio_is_valid(config->ena_gpio)) {
4044 mutex_lock(&regulator_list_mutex);
4045 ret = regulator_ena_gpio_request(rdev, config);
4046 mutex_unlock(&regulator_list_mutex);
4047 if (ret != 0) {
4048 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4049 config->ena_gpio, ret);
4050 goto clean;
4051 }
4052 }
4053
4054 /* register with sysfs */
4055 rdev->dev.class = &regulator_class;
4056 rdev->dev.parent = dev;
4057 dev_set_name(&rdev->dev, "regulator.%lu",
4058 (unsigned long) atomic_inc_return(&regulator_no));
4059
4060 /* set regulator constraints */
4061 if (init_data)
4062 constraints = &init_data->constraints;
4063
4064 if (init_data && init_data->supply_regulator)
4065 rdev->supply_name = init_data->supply_regulator;
4066 else if (regulator_desc->supply_name)
4067 rdev->supply_name = regulator_desc->supply_name;
4068
4069 /*
4070 * Attempt to resolve the regulator supply, if specified,
4071 * but don't return an error if we fail because we will try
4072 * to resolve it again later as more regulators are added.
4073 */
4074 if (regulator_resolve_supply(rdev))
4075 rdev_dbg(rdev, "unable to resolve supply\n");
4076
4077 ret = set_machine_constraints(rdev, constraints);
4078 if (ret < 0)
4079 goto wash;
4080
4081 /* add consumers devices */
4082 if (init_data) {
4083 mutex_lock(&regulator_list_mutex);
4084 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4085 ret = set_consumer_device_supply(rdev,
4086 init_data->consumer_supplies[i].dev_name,
4087 init_data->consumer_supplies[i].supply);
4088 if (ret < 0) {
4089 mutex_unlock(&regulator_list_mutex);
4090 dev_err(dev, "Failed to set supply %s\n",
4091 init_data->consumer_supplies[i].supply);
4092 goto unset_supplies;
4093 }
4094 }
4095 mutex_unlock(&regulator_list_mutex);
4096 }
4097
4098 if (!rdev->desc->ops->get_voltage &&
4099 !rdev->desc->ops->list_voltage &&
4100 !rdev->desc->fixed_uV)
4101 rdev->is_switch = true;
4102
4103 ret = device_register(&rdev->dev);
4104 if (ret != 0) {
4105 put_device(&rdev->dev);
4106 goto unset_supplies;
4107 }
4108
4109 dev_set_drvdata(&rdev->dev, rdev);
4110 rdev_init_debugfs(rdev);
4111
4112 /* try to resolve regulators supply since a new one was registered */
4113 class_for_each_device(&regulator_class, NULL, NULL,
4114 regulator_register_resolve_supply);
4115 kfree(config);
4116 return rdev;
4117
4118unset_supplies:
4119 mutex_lock(&regulator_list_mutex);
4120 unset_regulator_supplies(rdev);
4121 mutex_unlock(&regulator_list_mutex);
4122wash:
4123 kfree(rdev->constraints);
4124 mutex_lock(&regulator_list_mutex);
4125 regulator_ena_gpio_free(rdev);
4126 mutex_unlock(&regulator_list_mutex);
4127clean:
4128 kfree(rdev);
4129 kfree(config);
4130 return ERR_PTR(ret);
4131}
4132EXPORT_SYMBOL_GPL(regulator_register);
4133
4134/**
4135 * regulator_unregister - unregister regulator
4136 * @rdev: regulator to unregister
4137 *
4138 * Called by regulator drivers to unregister a regulator.
4139 */
4140void regulator_unregister(struct regulator_dev *rdev)
4141{
4142 if (rdev == NULL)
4143 return;
4144
4145 if (rdev->supply) {
4146 while (rdev->use_count--)
4147 regulator_disable(rdev->supply);
4148 regulator_put(rdev->supply);
4149 }
4150 mutex_lock(&regulator_list_mutex);
4151 debugfs_remove_recursive(rdev->debugfs);
4152 flush_work(&rdev->disable_work.work);
4153 WARN_ON(rdev->open_count);
4154 unset_regulator_supplies(rdev);
4155 list_del(&rdev->list);
4156 regulator_ena_gpio_free(rdev);
4157 mutex_unlock(&regulator_list_mutex);
4158 device_unregister(&rdev->dev);
4159}
4160EXPORT_SYMBOL_GPL(regulator_unregister);
4161
4162static int _regulator_suspend_prepare(struct device *dev, void *data)
4163{
4164 struct regulator_dev *rdev = dev_to_rdev(dev);
4165 const suspend_state_t *state = data;
4166 int ret;
4167
4168 mutex_lock(&rdev->mutex);
4169 ret = suspend_prepare(rdev, *state);
4170 mutex_unlock(&rdev->mutex);
4171
4172 return ret;
4173}
4174
4175/**
4176 * regulator_suspend_prepare - prepare regulators for system wide suspend
4177 * @state: system suspend state
4178 *
4179 * Configure each regulator with it's suspend operating parameters for state.
4180 * This will usually be called by machine suspend code prior to supending.
4181 */
4182int regulator_suspend_prepare(suspend_state_t state)
4183{
4184 /* ON is handled by regulator active state */
4185 if (state == PM_SUSPEND_ON)
4186 return -EINVAL;
4187
4188 return class_for_each_device(&regulator_class, NULL, &state,
4189 _regulator_suspend_prepare);
4190}
4191EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4192
4193static int _regulator_suspend_finish(struct device *dev, void *data)
4194{
4195 struct regulator_dev *rdev = dev_to_rdev(dev);
4196 int ret;
4197
4198 mutex_lock(&rdev->mutex);
4199 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4200 if (!_regulator_is_enabled(rdev)) {
4201 ret = _regulator_do_enable(rdev);
4202 if (ret)
4203 dev_err(dev,
4204 "Failed to resume regulator %d\n",
4205 ret);
4206 }
4207 } else {
4208 if (!have_full_constraints())
4209 goto unlock;
4210 if (!_regulator_is_enabled(rdev))
4211 goto unlock;
4212
4213 ret = _regulator_do_disable(rdev);
4214 if (ret)
4215 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4216 }
4217unlock:
4218 mutex_unlock(&rdev->mutex);
4219
4220 /* Keep processing regulators in spite of any errors */
4221 return 0;
4222}
4223
4224/**
4225 * regulator_suspend_finish - resume regulators from system wide suspend
4226 *
4227 * Turn on regulators that might be turned off by regulator_suspend_prepare
4228 * and that should be turned on according to the regulators properties.
4229 */
4230int regulator_suspend_finish(void)
4231{
4232 return class_for_each_device(&regulator_class, NULL, NULL,
4233 _regulator_suspend_finish);
4234}
4235EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4236
4237/**
4238 * regulator_has_full_constraints - the system has fully specified constraints
4239 *
4240 * Calling this function will cause the regulator API to disable all
4241 * regulators which have a zero use count and don't have an always_on
4242 * constraint in a late_initcall.
4243 *
4244 * The intention is that this will become the default behaviour in a
4245 * future kernel release so users are encouraged to use this facility
4246 * now.
4247 */
4248void regulator_has_full_constraints(void)
4249{
4250 has_full_constraints = 1;
4251}
4252EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4253
4254/**
4255 * rdev_get_drvdata - get rdev regulator driver data
4256 * @rdev: regulator
4257 *
4258 * Get rdev regulator driver private data. This call can be used in the
4259 * regulator driver context.
4260 */
4261void *rdev_get_drvdata(struct regulator_dev *rdev)
4262{
4263 return rdev->reg_data;
4264}
4265EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4266
4267/**
4268 * regulator_get_drvdata - get regulator driver data
4269 * @regulator: regulator
4270 *
4271 * Get regulator driver private data. This call can be used in the consumer
4272 * driver context when non API regulator specific functions need to be called.
4273 */
4274void *regulator_get_drvdata(struct regulator *regulator)
4275{
4276 return regulator->rdev->reg_data;
4277}
4278EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4279
4280/**
4281 * regulator_set_drvdata - set regulator driver data
4282 * @regulator: regulator
4283 * @data: data
4284 */
4285void regulator_set_drvdata(struct regulator *regulator, void *data)
4286{
4287 regulator->rdev->reg_data = data;
4288}
4289EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4290
4291/**
4292 * regulator_get_id - get regulator ID
4293 * @rdev: regulator
4294 */
4295int rdev_get_id(struct regulator_dev *rdev)
4296{
4297 return rdev->desc->id;
4298}
4299EXPORT_SYMBOL_GPL(rdev_get_id);
4300
4301struct device *rdev_get_dev(struct regulator_dev *rdev)
4302{
4303 return &rdev->dev;
4304}
4305EXPORT_SYMBOL_GPL(rdev_get_dev);
4306
4307void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4308{
4309 return reg_init_data->driver_data;
4310}
4311EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4312
4313#ifdef CONFIG_DEBUG_FS
4314static int supply_map_show(struct seq_file *sf, void *data)
4315{
4316 struct regulator_map *map;
4317
4318 list_for_each_entry(map, &regulator_map_list, list) {
4319 seq_printf(sf, "%s -> %s.%s\n",
4320 rdev_get_name(map->regulator), map->dev_name,
4321 map->supply);
4322 }
4323
4324 return 0;
4325}
4326
4327static int supply_map_open(struct inode *inode, struct file *file)
4328{
4329 return single_open(file, supply_map_show, inode->i_private);
4330}
4331#endif
4332
4333static const struct file_operations supply_map_fops = {
4334#ifdef CONFIG_DEBUG_FS
4335 .open = supply_map_open,
4336 .read = seq_read,
4337 .llseek = seq_lseek,
4338 .release = single_release,
4339#endif
4340};
4341
4342#ifdef CONFIG_DEBUG_FS
4343struct summary_data {
4344 struct seq_file *s;
4345 struct regulator_dev *parent;
4346 int level;
4347};
4348
4349static void regulator_summary_show_subtree(struct seq_file *s,
4350 struct regulator_dev *rdev,
4351 int level);
4352
4353static int regulator_summary_show_children(struct device *dev, void *data)
4354{
4355 struct regulator_dev *rdev = dev_to_rdev(dev);
4356 struct summary_data *summary_data = data;
4357
4358 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4359 regulator_summary_show_subtree(summary_data->s, rdev,
4360 summary_data->level + 1);
4361
4362 return 0;
4363}
4364
4365static void regulator_summary_show_subtree(struct seq_file *s,
4366 struct regulator_dev *rdev,
4367 int level)
4368{
4369 struct regulation_constraints *c;
4370 struct regulator *consumer;
4371 struct summary_data summary_data;
4372
4373 if (!rdev)
4374 return;
4375
4376 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4377 level * 3 + 1, "",
4378 30 - level * 3, rdev_get_name(rdev),
4379 rdev->use_count, rdev->open_count, rdev->bypass_count);
4380
4381 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4382 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4383
4384 c = rdev->constraints;
4385 if (c) {
4386 switch (rdev->desc->type) {
4387 case REGULATOR_VOLTAGE:
4388 seq_printf(s, "%5dmV %5dmV ",
4389 c->min_uV / 1000, c->max_uV / 1000);
4390 break;
4391 case REGULATOR_CURRENT:
4392 seq_printf(s, "%5dmA %5dmA ",
4393 c->min_uA / 1000, c->max_uA / 1000);
4394 break;
4395 }
4396 }
4397
4398 seq_puts(s, "\n");
4399
4400 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4401 if (consumer->dev && consumer->dev->class == &regulator_class)
4402 continue;
4403
4404 seq_printf(s, "%*s%-*s ",
4405 (level + 1) * 3 + 1, "",
4406 30 - (level + 1) * 3,
4407 consumer->dev ? dev_name(consumer->dev) : "deviceless");
4408
4409 switch (rdev->desc->type) {
4410 case REGULATOR_VOLTAGE:
4411 seq_printf(s, "%37dmV %5dmV",
4412 consumer->min_uV / 1000,
4413 consumer->max_uV / 1000);
4414 break;
4415 case REGULATOR_CURRENT:
4416 break;
4417 }
4418
4419 seq_puts(s, "\n");
4420 }
4421
4422 summary_data.s = s;
4423 summary_data.level = level;
4424 summary_data.parent = rdev;
4425
4426 class_for_each_device(&regulator_class, NULL, &summary_data,
4427 regulator_summary_show_children);
4428}
4429
4430static int regulator_summary_show_roots(struct device *dev, void *data)
4431{
4432 struct regulator_dev *rdev = dev_to_rdev(dev);
4433 struct seq_file *s = data;
4434
4435 if (!rdev->supply)
4436 regulator_summary_show_subtree(s, rdev, 0);
4437
4438 return 0;
4439}
4440
4441static int regulator_summary_show(struct seq_file *s, void *data)
4442{
4443 seq_puts(s, " regulator use open bypass voltage current min max\n");
4444 seq_puts(s, "-------------------------------------------------------------------------------\n");
4445
4446 class_for_each_device(&regulator_class, NULL, s,
4447 regulator_summary_show_roots);
4448
4449 return 0;
4450}
4451
4452static int regulator_summary_open(struct inode *inode, struct file *file)
4453{
4454 return single_open(file, regulator_summary_show, inode->i_private);
4455}
4456#endif
4457
4458static const struct file_operations regulator_summary_fops = {
4459#ifdef CONFIG_DEBUG_FS
4460 .open = regulator_summary_open,
4461 .read = seq_read,
4462 .llseek = seq_lseek,
4463 .release = single_release,
4464#endif
4465};
4466
4467static int __init regulator_init(void)
4468{
4469 int ret;
4470
4471 ret = class_register(&regulator_class);
4472
4473 debugfs_root = debugfs_create_dir("regulator", NULL);
4474 if (!debugfs_root)
4475 pr_warn("regulator: Failed to create debugfs directory\n");
4476
4477 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4478 &supply_map_fops);
4479
4480 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4481 NULL, &regulator_summary_fops);
4482
4483 regulator_dummy_init();
4484
4485 return ret;
4486}
4487
4488/* init early to allow our consumers to complete system booting */
4489core_initcall(regulator_init);
4490
4491static int __init regulator_late_cleanup(struct device *dev, void *data)
4492{
4493 struct regulator_dev *rdev = dev_to_rdev(dev);
4494 const struct regulator_ops *ops = rdev->desc->ops;
4495 struct regulation_constraints *c = rdev->constraints;
4496 int enabled, ret;
4497
4498 if (c && c->always_on)
4499 return 0;
4500
4501 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4502 return 0;
4503
4504 mutex_lock(&rdev->mutex);
4505
4506 if (rdev->use_count)
4507 goto unlock;
4508
4509 /* If we can't read the status assume it's on. */
4510 if (ops->is_enabled)
4511 enabled = ops->is_enabled(rdev);
4512 else
4513 enabled = 1;
4514
4515 if (!enabled)
4516 goto unlock;
4517
4518 if (have_full_constraints()) {
4519 /* We log since this may kill the system if it goes
4520 * wrong. */
4521 rdev_info(rdev, "disabling\n");
4522 ret = _regulator_do_disable(rdev);
4523 if (ret != 0)
4524 rdev_err(rdev, "couldn't disable: %d\n", ret);
4525 } else {
4526 /* The intention is that in future we will
4527 * assume that full constraints are provided
4528 * so warn even if we aren't going to do
4529 * anything here.
4530 */
4531 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4532 }
4533
4534unlock:
4535 mutex_unlock(&rdev->mutex);
4536
4537 return 0;
4538}
4539
4540static int __init regulator_init_complete(void)
4541{
4542 /*
4543 * Since DT doesn't provide an idiomatic mechanism for
4544 * enabling full constraints and since it's much more natural
4545 * with DT to provide them just assume that a DT enabled
4546 * system has full constraints.
4547 */
4548 if (of_have_populated_dt())
4549 has_full_constraints = true;
4550
4551 /*
4552 * Regulators may had failed to resolve their input supplies
4553 * when were registered, either because the input supply was
4554 * not registered yet or because its parent device was not
4555 * bound yet. So attempt to resolve the input supplies for
4556 * pending regulators before trying to disable unused ones.
4557 */
4558 class_for_each_device(&regulator_class, NULL, NULL,
4559 regulator_register_resolve_supply);
4560
4561 /* If we have a full configuration then disable any regulators
4562 * we have permission to change the status for and which are
4563 * not in use or always_on. This is effectively the default
4564 * for DT and ACPI as they have full constraints.
4565 */
4566 class_for_each_device(&regulator_class, NULL, NULL,
4567 regulator_late_cleanup);
4568
4569 return 0;
4570}
4571late_initcall_sync(regulator_init_complete);
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