Merge tag 'regulator-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[sfrench/cifs-2.6.git] / drivers / regulator / core.c
1 /*
2  * core.c  --  Voltage/Current Regulator framework.
3  *
4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5  * Copyright 2008 SlimLogic Ltd.
6  *
7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8  *
9  *  This program is free software; you can redistribute  it and/or modify it
10  *  under  the terms of  the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the  License, or (at your
12  *  option) any later version.
13  *
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/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
53 static DEFINE_MUTEX(regulator_list_mutex);
54 static LIST_HEAD(regulator_map_list);
55 static LIST_HEAD(regulator_ena_gpio_list);
56 static LIST_HEAD(regulator_supply_alias_list);
57 static bool has_full_constraints;
58
59 static struct dentry *debugfs_root;
60
61 /*
62  * struct regulator_map
63  *
64  * Used to provide symbolic supply names to devices.
65  */
66 struct regulator_map {
67         struct list_head list;
68         const char *dev_name;   /* The dev_name() for the consumer */
69         const char *supply;
70         struct regulator_dev *regulator;
71 };
72
73 /*
74  * struct regulator_enable_gpio
75  *
76  * Management for shared enable GPIO pin
77  */
78 struct regulator_enable_gpio {
79         struct list_head list;
80         struct gpio_desc *gpiod;
81         u32 enable_count;       /* a number of enabled shared GPIO */
82         u32 request_count;      /* a number of requested shared GPIO */
83         unsigned int ena_gpio_invert:1;
84 };
85
86 /*
87  * struct regulator_supply_alias
88  *
89  * Used to map lookups for a supply onto an alternative device.
90  */
91 struct regulator_supply_alias {
92         struct list_head list;
93         struct device *src_dev;
94         const char *src_supply;
95         struct device *alias_dev;
96         const char *alias_supply;
97 };
98
99 static int _regulator_is_enabled(struct regulator_dev *rdev);
100 static int _regulator_disable(struct regulator_dev *rdev);
101 static int _regulator_get_voltage(struct regulator_dev *rdev);
102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
104 static int _notifier_call_chain(struct regulator_dev *rdev,
105                                   unsigned long event, void *data);
106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
107                                      int min_uV, int max_uV);
108 static struct regulator *create_regulator(struct regulator_dev *rdev,
109                                           struct device *dev,
110                                           const char *supply_name);
111 static void _regulator_put(struct regulator *regulator);
112
113 static const char *rdev_get_name(struct regulator_dev *rdev)
114 {
115         if (rdev->constraints && rdev->constraints->name)
116                 return rdev->constraints->name;
117         else if (rdev->desc->name)
118                 return rdev->desc->name;
119         else
120                 return "";
121 }
122
123 static bool have_full_constraints(void)
124 {
125         return has_full_constraints || of_have_populated_dt();
126 }
127
128 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
129 {
130         if (!rdev->constraints) {
131                 rdev_err(rdev, "no constraints\n");
132                 return false;
133         }
134
135         if (rdev->constraints->valid_ops_mask & ops)
136                 return true;
137
138         return false;
139 }
140
141 static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
142 {
143         if (rdev && rdev->supply)
144                 return rdev->supply->rdev;
145
146         return NULL;
147 }
148
149 /**
150  * regulator_lock_supply - lock a regulator and its supplies
151  * @rdev:         regulator source
152  */
153 static void regulator_lock_supply(struct regulator_dev *rdev)
154 {
155         int i;
156
157         for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
158                 mutex_lock_nested(&rdev->mutex, i);
159 }
160
161 /**
162  * regulator_unlock_supply - unlock a regulator and its supplies
163  * @rdev:         regulator source
164  */
165 static void regulator_unlock_supply(struct regulator_dev *rdev)
166 {
167         struct regulator *supply;
168
169         while (1) {
170                 mutex_unlock(&rdev->mutex);
171                 supply = rdev->supply;
172
173                 if (!rdev->supply)
174                         return;
175
176                 rdev = supply->rdev;
177         }
178 }
179
180 /**
181  * of_get_regulator - get a regulator device node based on supply name
182  * @dev: Device pointer for the consumer (of regulator) device
183  * @supply: regulator supply name
184  *
185  * Extract the regulator device node corresponding to the supply name.
186  * returns the device node corresponding to the regulator if found, else
187  * returns NULL.
188  */
189 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
190 {
191         struct device_node *regnode = NULL;
192         char prop_name[32]; /* 32 is max size of property name */
193
194         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
195
196         snprintf(prop_name, 32, "%s-supply", supply);
197         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
198
199         if (!regnode) {
200                 dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
201                                 prop_name, dev->of_node);
202                 return NULL;
203         }
204         return regnode;
205 }
206
207 /* Platform voltage constraint check */
208 static int regulator_check_voltage(struct regulator_dev *rdev,
209                                    int *min_uV, int *max_uV)
210 {
211         BUG_ON(*min_uV > *max_uV);
212
213         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
214                 rdev_err(rdev, "voltage operation not allowed\n");
215                 return -EPERM;
216         }
217
218         if (*max_uV > rdev->constraints->max_uV)
219                 *max_uV = rdev->constraints->max_uV;
220         if (*min_uV < rdev->constraints->min_uV)
221                 *min_uV = rdev->constraints->min_uV;
222
223         if (*min_uV > *max_uV) {
224                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
225                          *min_uV, *max_uV);
226                 return -EINVAL;
227         }
228
229         return 0;
230 }
231
232 /* return 0 if the state is valid */
233 static int regulator_check_states(suspend_state_t state)
234 {
235         return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
236 }
237
238 /* Make sure we select a voltage that suits the needs of all
239  * regulator consumers
240  */
241 static int regulator_check_consumers(struct regulator_dev *rdev,
242                                      int *min_uV, int *max_uV,
243                                      suspend_state_t state)
244 {
245         struct regulator *regulator;
246         struct regulator_voltage *voltage;
247
248         list_for_each_entry(regulator, &rdev->consumer_list, list) {
249                 voltage = &regulator->voltage[state];
250                 /*
251                  * Assume consumers that didn't say anything are OK
252                  * with anything in the constraint range.
253                  */
254                 if (!voltage->min_uV && !voltage->max_uV)
255                         continue;
256
257                 if (*max_uV > voltage->max_uV)
258                         *max_uV = voltage->max_uV;
259                 if (*min_uV < voltage->min_uV)
260                         *min_uV = voltage->min_uV;
261         }
262
263         if (*min_uV > *max_uV) {
264                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
265                         *min_uV, *max_uV);
266                 return -EINVAL;
267         }
268
269         return 0;
270 }
271
272 /* current constraint check */
273 static int regulator_check_current_limit(struct regulator_dev *rdev,
274                                         int *min_uA, int *max_uA)
275 {
276         BUG_ON(*min_uA > *max_uA);
277
278         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
279                 rdev_err(rdev, "current operation not allowed\n");
280                 return -EPERM;
281         }
282
283         if (*max_uA > rdev->constraints->max_uA)
284                 *max_uA = rdev->constraints->max_uA;
285         if (*min_uA < rdev->constraints->min_uA)
286                 *min_uA = rdev->constraints->min_uA;
287
288         if (*min_uA > *max_uA) {
289                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
290                          *min_uA, *max_uA);
291                 return -EINVAL;
292         }
293
294         return 0;
295 }
296
297 /* operating mode constraint check */
298 static int regulator_mode_constrain(struct regulator_dev *rdev,
299                                     unsigned int *mode)
300 {
301         switch (*mode) {
302         case REGULATOR_MODE_FAST:
303         case REGULATOR_MODE_NORMAL:
304         case REGULATOR_MODE_IDLE:
305         case REGULATOR_MODE_STANDBY:
306                 break;
307         default:
308                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
309                 return -EINVAL;
310         }
311
312         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
313                 rdev_err(rdev, "mode operation not allowed\n");
314                 return -EPERM;
315         }
316
317         /* The modes are bitmasks, the most power hungry modes having
318          * the lowest values. If the requested mode isn't supported
319          * try higher modes. */
320         while (*mode) {
321                 if (rdev->constraints->valid_modes_mask & *mode)
322                         return 0;
323                 *mode /= 2;
324         }
325
326         return -EINVAL;
327 }
328
329 static inline struct regulator_state *
330 regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state)
331 {
332         if (rdev->constraints == NULL)
333                 return NULL;
334
335         switch (state) {
336         case PM_SUSPEND_STANDBY:
337                 return &rdev->constraints->state_standby;
338         case PM_SUSPEND_MEM:
339                 return &rdev->constraints->state_mem;
340         case PM_SUSPEND_MAX:
341                 return &rdev->constraints->state_disk;
342         default:
343                 return NULL;
344         }
345 }
346
347 static ssize_t regulator_uV_show(struct device *dev,
348                                 struct device_attribute *attr, char *buf)
349 {
350         struct regulator_dev *rdev = dev_get_drvdata(dev);
351         ssize_t ret;
352
353         mutex_lock(&rdev->mutex);
354         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
355         mutex_unlock(&rdev->mutex);
356
357         return ret;
358 }
359 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
360
361 static ssize_t regulator_uA_show(struct device *dev,
362                                 struct device_attribute *attr, char *buf)
363 {
364         struct regulator_dev *rdev = dev_get_drvdata(dev);
365
366         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
367 }
368 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
369
370 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
371                          char *buf)
372 {
373         struct regulator_dev *rdev = dev_get_drvdata(dev);
374
375         return sprintf(buf, "%s\n", rdev_get_name(rdev));
376 }
377 static DEVICE_ATTR_RO(name);
378
379 static ssize_t regulator_print_opmode(char *buf, int mode)
380 {
381         switch (mode) {
382         case REGULATOR_MODE_FAST:
383                 return sprintf(buf, "fast\n");
384         case REGULATOR_MODE_NORMAL:
385                 return sprintf(buf, "normal\n");
386         case REGULATOR_MODE_IDLE:
387                 return sprintf(buf, "idle\n");
388         case REGULATOR_MODE_STANDBY:
389                 return sprintf(buf, "standby\n");
390         }
391         return sprintf(buf, "unknown\n");
392 }
393
394 static ssize_t regulator_opmode_show(struct device *dev,
395                                     struct device_attribute *attr, char *buf)
396 {
397         struct regulator_dev *rdev = dev_get_drvdata(dev);
398
399         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
400 }
401 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
402
403 static ssize_t regulator_print_state(char *buf, int state)
404 {
405         if (state > 0)
406                 return sprintf(buf, "enabled\n");
407         else if (state == 0)
408                 return sprintf(buf, "disabled\n");
409         else
410                 return sprintf(buf, "unknown\n");
411 }
412
413 static ssize_t regulator_state_show(struct device *dev,
414                                    struct device_attribute *attr, char *buf)
415 {
416         struct regulator_dev *rdev = dev_get_drvdata(dev);
417         ssize_t ret;
418
419         mutex_lock(&rdev->mutex);
420         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
421         mutex_unlock(&rdev->mutex);
422
423         return ret;
424 }
425 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
426
427 static ssize_t regulator_status_show(struct device *dev,
428                                    struct device_attribute *attr, char *buf)
429 {
430         struct regulator_dev *rdev = dev_get_drvdata(dev);
431         int status;
432         char *label;
433
434         status = rdev->desc->ops->get_status(rdev);
435         if (status < 0)
436                 return status;
437
438         switch (status) {
439         case REGULATOR_STATUS_OFF:
440                 label = "off";
441                 break;
442         case REGULATOR_STATUS_ON:
443                 label = "on";
444                 break;
445         case REGULATOR_STATUS_ERROR:
446                 label = "error";
447                 break;
448         case REGULATOR_STATUS_FAST:
449                 label = "fast";
450                 break;
451         case REGULATOR_STATUS_NORMAL:
452                 label = "normal";
453                 break;
454         case REGULATOR_STATUS_IDLE:
455                 label = "idle";
456                 break;
457         case REGULATOR_STATUS_STANDBY:
458                 label = "standby";
459                 break;
460         case REGULATOR_STATUS_BYPASS:
461                 label = "bypass";
462                 break;
463         case REGULATOR_STATUS_UNDEFINED:
464                 label = "undefined";
465                 break;
466         default:
467                 return -ERANGE;
468         }
469
470         return sprintf(buf, "%s\n", label);
471 }
472 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
473
474 static ssize_t regulator_min_uA_show(struct device *dev,
475                                     struct device_attribute *attr, char *buf)
476 {
477         struct regulator_dev *rdev = dev_get_drvdata(dev);
478
479         if (!rdev->constraints)
480                 return sprintf(buf, "constraint not defined\n");
481
482         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
483 }
484 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
485
486 static ssize_t regulator_max_uA_show(struct device *dev,
487                                     struct device_attribute *attr, char *buf)
488 {
489         struct regulator_dev *rdev = dev_get_drvdata(dev);
490
491         if (!rdev->constraints)
492                 return sprintf(buf, "constraint not defined\n");
493
494         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
495 }
496 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
497
498 static ssize_t regulator_min_uV_show(struct device *dev,
499                                     struct device_attribute *attr, char *buf)
500 {
501         struct regulator_dev *rdev = dev_get_drvdata(dev);
502
503         if (!rdev->constraints)
504                 return sprintf(buf, "constraint not defined\n");
505
506         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
507 }
508 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
509
510 static ssize_t regulator_max_uV_show(struct device *dev,
511                                     struct device_attribute *attr, char *buf)
512 {
513         struct regulator_dev *rdev = dev_get_drvdata(dev);
514
515         if (!rdev->constraints)
516                 return sprintf(buf, "constraint not defined\n");
517
518         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
519 }
520 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
521
522 static ssize_t regulator_total_uA_show(struct device *dev,
523                                       struct device_attribute *attr, char *buf)
524 {
525         struct regulator_dev *rdev = dev_get_drvdata(dev);
526         struct regulator *regulator;
527         int uA = 0;
528
529         mutex_lock(&rdev->mutex);
530         list_for_each_entry(regulator, &rdev->consumer_list, list)
531                 uA += regulator->uA_load;
532         mutex_unlock(&rdev->mutex);
533         return sprintf(buf, "%d\n", uA);
534 }
535 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
536
537 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
538                               char *buf)
539 {
540         struct regulator_dev *rdev = dev_get_drvdata(dev);
541         return sprintf(buf, "%d\n", rdev->use_count);
542 }
543 static DEVICE_ATTR_RO(num_users);
544
545 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
546                          char *buf)
547 {
548         struct regulator_dev *rdev = dev_get_drvdata(dev);
549
550         switch (rdev->desc->type) {
551         case REGULATOR_VOLTAGE:
552                 return sprintf(buf, "voltage\n");
553         case REGULATOR_CURRENT:
554                 return sprintf(buf, "current\n");
555         }
556         return sprintf(buf, "unknown\n");
557 }
558 static DEVICE_ATTR_RO(type);
559
560 static ssize_t regulator_suspend_mem_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_mem.uV);
566 }
567 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
568                 regulator_suspend_mem_uV_show, NULL);
569
570 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
571                                 struct device_attribute *attr, char *buf)
572 {
573         struct regulator_dev *rdev = dev_get_drvdata(dev);
574
575         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
576 }
577 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
578                 regulator_suspend_disk_uV_show, NULL);
579
580 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
581                                 struct device_attribute *attr, char *buf)
582 {
583         struct regulator_dev *rdev = dev_get_drvdata(dev);
584
585         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
586 }
587 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
588                 regulator_suspend_standby_uV_show, NULL);
589
590 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
591                                 struct device_attribute *attr, char *buf)
592 {
593         struct regulator_dev *rdev = dev_get_drvdata(dev);
594
595         return regulator_print_opmode(buf,
596                 rdev->constraints->state_mem.mode);
597 }
598 static DEVICE_ATTR(suspend_mem_mode, 0444,
599                 regulator_suspend_mem_mode_show, NULL);
600
601 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
602                                 struct device_attribute *attr, char *buf)
603 {
604         struct regulator_dev *rdev = dev_get_drvdata(dev);
605
606         return regulator_print_opmode(buf,
607                 rdev->constraints->state_disk.mode);
608 }
609 static DEVICE_ATTR(suspend_disk_mode, 0444,
610                 regulator_suspend_disk_mode_show, NULL);
611
612 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
613                                 struct device_attribute *attr, char *buf)
614 {
615         struct regulator_dev *rdev = dev_get_drvdata(dev);
616
617         return regulator_print_opmode(buf,
618                 rdev->constraints->state_standby.mode);
619 }
620 static DEVICE_ATTR(suspend_standby_mode, 0444,
621                 regulator_suspend_standby_mode_show, NULL);
622
623 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
624                                    struct device_attribute *attr, char *buf)
625 {
626         struct regulator_dev *rdev = dev_get_drvdata(dev);
627
628         return regulator_print_state(buf,
629                         rdev->constraints->state_mem.enabled);
630 }
631 static DEVICE_ATTR(suspend_mem_state, 0444,
632                 regulator_suspend_mem_state_show, NULL);
633
634 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
635                                    struct device_attribute *attr, char *buf)
636 {
637         struct regulator_dev *rdev = dev_get_drvdata(dev);
638
639         return regulator_print_state(buf,
640                         rdev->constraints->state_disk.enabled);
641 }
642 static DEVICE_ATTR(suspend_disk_state, 0444,
643                 regulator_suspend_disk_state_show, NULL);
644
645 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
646                                    struct device_attribute *attr, char *buf)
647 {
648         struct regulator_dev *rdev = dev_get_drvdata(dev);
649
650         return regulator_print_state(buf,
651                         rdev->constraints->state_standby.enabled);
652 }
653 static DEVICE_ATTR(suspend_standby_state, 0444,
654                 regulator_suspend_standby_state_show, NULL);
655
656 static ssize_t regulator_bypass_show(struct device *dev,
657                                      struct device_attribute *attr, char *buf)
658 {
659         struct regulator_dev *rdev = dev_get_drvdata(dev);
660         const char *report;
661         bool bypass;
662         int ret;
663
664         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
665
666         if (ret != 0)
667                 report = "unknown";
668         else if (bypass)
669                 report = "enabled";
670         else
671                 report = "disabled";
672
673         return sprintf(buf, "%s\n", report);
674 }
675 static DEVICE_ATTR(bypass, 0444,
676                    regulator_bypass_show, NULL);
677
678 /* Calculate the new optimum regulator operating mode based on the new total
679  * consumer load. All locks held by caller */
680 static int drms_uA_update(struct regulator_dev *rdev)
681 {
682         struct regulator *sibling;
683         int current_uA = 0, output_uV, input_uV, err;
684         unsigned int mode;
685
686         lockdep_assert_held_once(&rdev->mutex);
687
688         /*
689          * first check to see if we can set modes at all, otherwise just
690          * tell the consumer everything is OK.
691          */
692         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
693                 return 0;
694
695         if (!rdev->desc->ops->get_optimum_mode &&
696             !rdev->desc->ops->set_load)
697                 return 0;
698
699         if (!rdev->desc->ops->set_mode &&
700             !rdev->desc->ops->set_load)
701                 return -EINVAL;
702
703         /* calc total requested load */
704         list_for_each_entry(sibling, &rdev->consumer_list, list)
705                 current_uA += sibling->uA_load;
706
707         current_uA += rdev->constraints->system_load;
708
709         if (rdev->desc->ops->set_load) {
710                 /* set the optimum mode for our new total regulator load */
711                 err = rdev->desc->ops->set_load(rdev, current_uA);
712                 if (err < 0)
713                         rdev_err(rdev, "failed to set load %d\n", current_uA);
714         } else {
715                 /* get output voltage */
716                 output_uV = _regulator_get_voltage(rdev);
717                 if (output_uV <= 0) {
718                         rdev_err(rdev, "invalid output voltage found\n");
719                         return -EINVAL;
720                 }
721
722                 /* get input voltage */
723                 input_uV = 0;
724                 if (rdev->supply)
725                         input_uV = regulator_get_voltage(rdev->supply);
726                 if (input_uV <= 0)
727                         input_uV = rdev->constraints->input_uV;
728                 if (input_uV <= 0) {
729                         rdev_err(rdev, "invalid input voltage found\n");
730                         return -EINVAL;
731                 }
732
733                 /* now get the optimum mode for our new total regulator load */
734                 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
735                                                          output_uV, current_uA);
736
737                 /* check the new mode is allowed */
738                 err = regulator_mode_constrain(rdev, &mode);
739                 if (err < 0) {
740                         rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
741                                  current_uA, input_uV, output_uV);
742                         return err;
743                 }
744
745                 err = rdev->desc->ops->set_mode(rdev, mode);
746                 if (err < 0)
747                         rdev_err(rdev, "failed to set optimum mode %x\n", mode);
748         }
749
750         return err;
751 }
752
753 static int suspend_set_state(struct regulator_dev *rdev,
754                                     suspend_state_t state)
755 {
756         int ret = 0;
757         struct regulator_state *rstate;
758
759         rstate = regulator_get_suspend_state(rdev, state);
760         if (rstate == NULL)
761                 return -EINVAL;
762
763         /* If we have no suspend mode configration don't set anything;
764          * only warn if the driver implements set_suspend_voltage or
765          * set_suspend_mode callback.
766          */
767         if (rstate->enabled != ENABLE_IN_SUSPEND &&
768             rstate->enabled != DISABLE_IN_SUSPEND) {
769                 if (rdev->desc->ops->set_suspend_voltage ||
770                     rdev->desc->ops->set_suspend_mode)
771                         rdev_warn(rdev, "No configuration\n");
772                 return 0;
773         }
774
775         if (rstate->enabled == ENABLE_IN_SUSPEND &&
776                 rdev->desc->ops->set_suspend_enable)
777                 ret = rdev->desc->ops->set_suspend_enable(rdev);
778         else if (rstate->enabled == DISABLE_IN_SUSPEND &&
779                 rdev->desc->ops->set_suspend_disable)
780                 ret = rdev->desc->ops->set_suspend_disable(rdev);
781         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
782                 ret = 0;
783
784         if (ret < 0) {
785                 rdev_err(rdev, "failed to enabled/disable\n");
786                 return ret;
787         }
788
789         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
790                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
791                 if (ret < 0) {
792                         rdev_err(rdev, "failed to set voltage\n");
793                         return ret;
794                 }
795         }
796
797         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
798                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
799                 if (ret < 0) {
800                         rdev_err(rdev, "failed to set mode\n");
801                         return ret;
802                 }
803         }
804
805         return ret;
806 }
807
808 static void print_constraints(struct regulator_dev *rdev)
809 {
810         struct regulation_constraints *constraints = rdev->constraints;
811         char buf[160] = "";
812         size_t len = sizeof(buf) - 1;
813         int count = 0;
814         int ret;
815
816         if (constraints->min_uV && constraints->max_uV) {
817                 if (constraints->min_uV == constraints->max_uV)
818                         count += scnprintf(buf + count, len - count, "%d mV ",
819                                            constraints->min_uV / 1000);
820                 else
821                         count += scnprintf(buf + count, len - count,
822                                            "%d <--> %d mV ",
823                                            constraints->min_uV / 1000,
824                                            constraints->max_uV / 1000);
825         }
826
827         if (!constraints->min_uV ||
828             constraints->min_uV != constraints->max_uV) {
829                 ret = _regulator_get_voltage(rdev);
830                 if (ret > 0)
831                         count += scnprintf(buf + count, len - count,
832                                            "at %d mV ", ret / 1000);
833         }
834
835         if (constraints->uV_offset)
836                 count += scnprintf(buf + count, len - count, "%dmV offset ",
837                                    constraints->uV_offset / 1000);
838
839         if (constraints->min_uA && constraints->max_uA) {
840                 if (constraints->min_uA == constraints->max_uA)
841                         count += scnprintf(buf + count, len - count, "%d mA ",
842                                            constraints->min_uA / 1000);
843                 else
844                         count += scnprintf(buf + count, len - count,
845                                            "%d <--> %d mA ",
846                                            constraints->min_uA / 1000,
847                                            constraints->max_uA / 1000);
848         }
849
850         if (!constraints->min_uA ||
851             constraints->min_uA != constraints->max_uA) {
852                 ret = _regulator_get_current_limit(rdev);
853                 if (ret > 0)
854                         count += scnprintf(buf + count, len - count,
855                                            "at %d mA ", ret / 1000);
856         }
857
858         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
859                 count += scnprintf(buf + count, len - count, "fast ");
860         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
861                 count += scnprintf(buf + count, len - count, "normal ");
862         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
863                 count += scnprintf(buf + count, len - count, "idle ");
864         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
865                 count += scnprintf(buf + count, len - count, "standby");
866
867         if (!count)
868                 scnprintf(buf, len, "no parameters");
869
870         rdev_dbg(rdev, "%s\n", buf);
871
872         if ((constraints->min_uV != constraints->max_uV) &&
873             !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
874                 rdev_warn(rdev,
875                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
876 }
877
878 static int machine_constraints_voltage(struct regulator_dev *rdev,
879         struct regulation_constraints *constraints)
880 {
881         const struct regulator_ops *ops = rdev->desc->ops;
882         int ret;
883
884         /* do we need to apply the constraint voltage */
885         if (rdev->constraints->apply_uV &&
886             rdev->constraints->min_uV && rdev->constraints->max_uV) {
887                 int target_min, target_max;
888                 int current_uV = _regulator_get_voltage(rdev);
889                 if (current_uV < 0) {
890                         rdev_err(rdev,
891                                  "failed to get the current voltage(%d)\n",
892                                  current_uV);
893                         return current_uV;
894                 }
895
896                 /*
897                  * If we're below the minimum voltage move up to the
898                  * minimum voltage, if we're above the maximum voltage
899                  * then move down to the maximum.
900                  */
901                 target_min = current_uV;
902                 target_max = current_uV;
903
904                 if (current_uV < rdev->constraints->min_uV) {
905                         target_min = rdev->constraints->min_uV;
906                         target_max = rdev->constraints->min_uV;
907                 }
908
909                 if (current_uV > rdev->constraints->max_uV) {
910                         target_min = rdev->constraints->max_uV;
911                         target_max = rdev->constraints->max_uV;
912                 }
913
914                 if (target_min != current_uV || target_max != current_uV) {
915                         rdev_info(rdev, "Bringing %duV into %d-%duV\n",
916                                   current_uV, target_min, target_max);
917                         ret = _regulator_do_set_voltage(
918                                 rdev, target_min, target_max);
919                         if (ret < 0) {
920                                 rdev_err(rdev,
921                                         "failed to apply %d-%duV constraint(%d)\n",
922                                         target_min, target_max, ret);
923                                 return ret;
924                         }
925                 }
926         }
927
928         /* constrain machine-level voltage specs to fit
929          * the actual range supported by this regulator.
930          */
931         if (ops->list_voltage && rdev->desc->n_voltages) {
932                 int     count = rdev->desc->n_voltages;
933                 int     i;
934                 int     min_uV = INT_MAX;
935                 int     max_uV = INT_MIN;
936                 int     cmin = constraints->min_uV;
937                 int     cmax = constraints->max_uV;
938
939                 /* it's safe to autoconfigure fixed-voltage supplies
940                    and the constraints are used by list_voltage. */
941                 if (count == 1 && !cmin) {
942                         cmin = 1;
943                         cmax = INT_MAX;
944                         constraints->min_uV = cmin;
945                         constraints->max_uV = cmax;
946                 }
947
948                 /* voltage constraints are optional */
949                 if ((cmin == 0) && (cmax == 0))
950                         return 0;
951
952                 /* else require explicit machine-level constraints */
953                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
954                         rdev_err(rdev, "invalid voltage constraints\n");
955                         return -EINVAL;
956                 }
957
958                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
959                 for (i = 0; i < count; i++) {
960                         int     value;
961
962                         value = ops->list_voltage(rdev, i);
963                         if (value <= 0)
964                                 continue;
965
966                         /* maybe adjust [min_uV..max_uV] */
967                         if (value >= cmin && value < min_uV)
968                                 min_uV = value;
969                         if (value <= cmax && value > max_uV)
970                                 max_uV = value;
971                 }
972
973                 /* final: [min_uV..max_uV] valid iff constraints valid */
974                 if (max_uV < min_uV) {
975                         rdev_err(rdev,
976                                  "unsupportable voltage constraints %u-%uuV\n",
977                                  min_uV, max_uV);
978                         return -EINVAL;
979                 }
980
981                 /* use regulator's subset of machine constraints */
982                 if (constraints->min_uV < min_uV) {
983                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
984                                  constraints->min_uV, min_uV);
985                         constraints->min_uV = min_uV;
986                 }
987                 if (constraints->max_uV > max_uV) {
988                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
989                                  constraints->max_uV, max_uV);
990                         constraints->max_uV = max_uV;
991                 }
992         }
993
994         return 0;
995 }
996
997 static int machine_constraints_current(struct regulator_dev *rdev,
998         struct regulation_constraints *constraints)
999 {
1000         const struct regulator_ops *ops = rdev->desc->ops;
1001         int ret;
1002
1003         if (!constraints->min_uA && !constraints->max_uA)
1004                 return 0;
1005
1006         if (constraints->min_uA > constraints->max_uA) {
1007                 rdev_err(rdev, "Invalid current constraints\n");
1008                 return -EINVAL;
1009         }
1010
1011         if (!ops->set_current_limit || !ops->get_current_limit) {
1012                 rdev_warn(rdev, "Operation of current configuration missing\n");
1013                 return 0;
1014         }
1015
1016         /* Set regulator current in constraints range */
1017         ret = ops->set_current_limit(rdev, constraints->min_uA,
1018                         constraints->max_uA);
1019         if (ret < 0) {
1020                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1021                 return ret;
1022         }
1023
1024         return 0;
1025 }
1026
1027 static int _regulator_do_enable(struct regulator_dev *rdev);
1028
1029 /**
1030  * set_machine_constraints - sets regulator constraints
1031  * @rdev: regulator source
1032  * @constraints: constraints to apply
1033  *
1034  * Allows platform initialisation code to define and constrain
1035  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
1036  * Constraints *must* be set by platform code in order for some
1037  * regulator operations to proceed i.e. set_voltage, set_current_limit,
1038  * set_mode.
1039  */
1040 static int set_machine_constraints(struct regulator_dev *rdev,
1041         const struct regulation_constraints *constraints)
1042 {
1043         int ret = 0;
1044         const struct regulator_ops *ops = rdev->desc->ops;
1045
1046         if (constraints)
1047                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1048                                             GFP_KERNEL);
1049         else
1050                 rdev->constraints = kzalloc(sizeof(*constraints),
1051                                             GFP_KERNEL);
1052         if (!rdev->constraints)
1053                 return -ENOMEM;
1054
1055         ret = machine_constraints_voltage(rdev, rdev->constraints);
1056         if (ret != 0)
1057                 return ret;
1058
1059         ret = machine_constraints_current(rdev, rdev->constraints);
1060         if (ret != 0)
1061                 return ret;
1062
1063         if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1064                 ret = ops->set_input_current_limit(rdev,
1065                                                    rdev->constraints->ilim_uA);
1066                 if (ret < 0) {
1067                         rdev_err(rdev, "failed to set input limit\n");
1068                         return ret;
1069                 }
1070         }
1071
1072         /* do we need to setup our suspend state */
1073         if (rdev->constraints->initial_state) {
1074                 ret = suspend_set_state(rdev, rdev->constraints->initial_state);
1075                 if (ret < 0) {
1076                         rdev_err(rdev, "failed to set suspend state\n");
1077                         return ret;
1078                 }
1079         }
1080
1081         if (rdev->constraints->initial_mode) {
1082                 if (!ops->set_mode) {
1083                         rdev_err(rdev, "no set_mode operation\n");
1084                         return -EINVAL;
1085                 }
1086
1087                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1088                 if (ret < 0) {
1089                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1090                         return ret;
1091                 }
1092         }
1093
1094         /* If the constraints say the regulator should be on at this point
1095          * and we have control then make sure it is enabled.
1096          */
1097         if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1098                 ret = _regulator_do_enable(rdev);
1099                 if (ret < 0 && ret != -EINVAL) {
1100                         rdev_err(rdev, "failed to enable\n");
1101                         return ret;
1102                 }
1103         }
1104
1105         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1106                 && ops->set_ramp_delay) {
1107                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1108                 if (ret < 0) {
1109                         rdev_err(rdev, "failed to set ramp_delay\n");
1110                         return ret;
1111                 }
1112         }
1113
1114         if (rdev->constraints->pull_down && ops->set_pull_down) {
1115                 ret = ops->set_pull_down(rdev);
1116                 if (ret < 0) {
1117                         rdev_err(rdev, "failed to set pull down\n");
1118                         return ret;
1119                 }
1120         }
1121
1122         if (rdev->constraints->soft_start && ops->set_soft_start) {
1123                 ret = ops->set_soft_start(rdev);
1124                 if (ret < 0) {
1125                         rdev_err(rdev, "failed to set soft start\n");
1126                         return ret;
1127                 }
1128         }
1129
1130         if (rdev->constraints->over_current_protection
1131                 && ops->set_over_current_protection) {
1132                 ret = ops->set_over_current_protection(rdev);
1133                 if (ret < 0) {
1134                         rdev_err(rdev, "failed to set over current protection\n");
1135                         return ret;
1136                 }
1137         }
1138
1139         if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1140                 bool ad_state = (rdev->constraints->active_discharge ==
1141                               REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1142
1143                 ret = ops->set_active_discharge(rdev, ad_state);
1144                 if (ret < 0) {
1145                         rdev_err(rdev, "failed to set active discharge\n");
1146                         return ret;
1147                 }
1148         }
1149
1150         print_constraints(rdev);
1151         return 0;
1152 }
1153
1154 /**
1155  * set_supply - set regulator supply regulator
1156  * @rdev: regulator name
1157  * @supply_rdev: supply regulator name
1158  *
1159  * Called by platform initialisation code to set the supply regulator for this
1160  * regulator. This ensures that a regulators supply will also be enabled by the
1161  * core if it's child is enabled.
1162  */
1163 static int set_supply(struct regulator_dev *rdev,
1164                       struct regulator_dev *supply_rdev)
1165 {
1166         int err;
1167
1168         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1169
1170         if (!try_module_get(supply_rdev->owner))
1171                 return -ENODEV;
1172
1173         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1174         if (rdev->supply == NULL) {
1175                 err = -ENOMEM;
1176                 return err;
1177         }
1178         supply_rdev->open_count++;
1179
1180         return 0;
1181 }
1182
1183 /**
1184  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1185  * @rdev:         regulator source
1186  * @consumer_dev_name: dev_name() string for device supply applies to
1187  * @supply:       symbolic name for supply
1188  *
1189  * Allows platform initialisation code to map physical regulator
1190  * sources to symbolic names for supplies for use by devices.  Devices
1191  * should use these symbolic names to request regulators, avoiding the
1192  * need to provide board-specific regulator names as platform data.
1193  */
1194 static int set_consumer_device_supply(struct regulator_dev *rdev,
1195                                       const char *consumer_dev_name,
1196                                       const char *supply)
1197 {
1198         struct regulator_map *node;
1199         int has_dev;
1200
1201         if (supply == NULL)
1202                 return -EINVAL;
1203
1204         if (consumer_dev_name != NULL)
1205                 has_dev = 1;
1206         else
1207                 has_dev = 0;
1208
1209         list_for_each_entry(node, &regulator_map_list, list) {
1210                 if (node->dev_name && consumer_dev_name) {
1211                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1212                                 continue;
1213                 } else if (node->dev_name || consumer_dev_name) {
1214                         continue;
1215                 }
1216
1217                 if (strcmp(node->supply, supply) != 0)
1218                         continue;
1219
1220                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1221                          consumer_dev_name,
1222                          dev_name(&node->regulator->dev),
1223                          node->regulator->desc->name,
1224                          supply,
1225                          dev_name(&rdev->dev), rdev_get_name(rdev));
1226                 return -EBUSY;
1227         }
1228
1229         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1230         if (node == NULL)
1231                 return -ENOMEM;
1232
1233         node->regulator = rdev;
1234         node->supply = supply;
1235
1236         if (has_dev) {
1237                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1238                 if (node->dev_name == NULL) {
1239                         kfree(node);
1240                         return -ENOMEM;
1241                 }
1242         }
1243
1244         list_add(&node->list, &regulator_map_list);
1245         return 0;
1246 }
1247
1248 static void unset_regulator_supplies(struct regulator_dev *rdev)
1249 {
1250         struct regulator_map *node, *n;
1251
1252         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1253                 if (rdev == node->regulator) {
1254                         list_del(&node->list);
1255                         kfree(node->dev_name);
1256                         kfree(node);
1257                 }
1258         }
1259 }
1260
1261 #ifdef CONFIG_DEBUG_FS
1262 static ssize_t constraint_flags_read_file(struct file *file,
1263                                           char __user *user_buf,
1264                                           size_t count, loff_t *ppos)
1265 {
1266         const struct regulator *regulator = file->private_data;
1267         const struct regulation_constraints *c = regulator->rdev->constraints;
1268         char *buf;
1269         ssize_t ret;
1270
1271         if (!c)
1272                 return 0;
1273
1274         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1275         if (!buf)
1276                 return -ENOMEM;
1277
1278         ret = snprintf(buf, PAGE_SIZE,
1279                         "always_on: %u\n"
1280                         "boot_on: %u\n"
1281                         "apply_uV: %u\n"
1282                         "ramp_disable: %u\n"
1283                         "soft_start: %u\n"
1284                         "pull_down: %u\n"
1285                         "over_current_protection: %u\n",
1286                         c->always_on,
1287                         c->boot_on,
1288                         c->apply_uV,
1289                         c->ramp_disable,
1290                         c->soft_start,
1291                         c->pull_down,
1292                         c->over_current_protection);
1293
1294         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1295         kfree(buf);
1296
1297         return ret;
1298 }
1299
1300 #endif
1301
1302 static const struct file_operations constraint_flags_fops = {
1303 #ifdef CONFIG_DEBUG_FS
1304         .open = simple_open,
1305         .read = constraint_flags_read_file,
1306         .llseek = default_llseek,
1307 #endif
1308 };
1309
1310 #define REG_STR_SIZE    64
1311
1312 static struct regulator *create_regulator(struct regulator_dev *rdev,
1313                                           struct device *dev,
1314                                           const char *supply_name)
1315 {
1316         struct regulator *regulator;
1317         char buf[REG_STR_SIZE];
1318         int err, size;
1319
1320         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1321         if (regulator == NULL)
1322                 return NULL;
1323
1324         mutex_lock(&rdev->mutex);
1325         regulator->rdev = rdev;
1326         list_add(&regulator->list, &rdev->consumer_list);
1327
1328         if (dev) {
1329                 regulator->dev = dev;
1330
1331                 /* Add a link to the device sysfs entry */
1332                 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1333                                 dev->kobj.name, supply_name);
1334                 if (size >= REG_STR_SIZE)
1335                         goto overflow_err;
1336
1337                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1338                 if (regulator->supply_name == NULL)
1339                         goto overflow_err;
1340
1341                 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1342                                         buf);
1343                 if (err) {
1344                         rdev_dbg(rdev, "could not add device link %s err %d\n",
1345                                   dev->kobj.name, err);
1346                         /* non-fatal */
1347                 }
1348         } else {
1349                 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1350                 if (regulator->supply_name == NULL)
1351                         goto overflow_err;
1352         }
1353
1354         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1355                                                 rdev->debugfs);
1356         if (!regulator->debugfs) {
1357                 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1358         } else {
1359                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1360                                    &regulator->uA_load);
1361                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1362                                    &regulator->voltage[PM_SUSPEND_ON].min_uV);
1363                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1364                                    &regulator->voltage[PM_SUSPEND_ON].max_uV);
1365                 debugfs_create_file("constraint_flags", 0444,
1366                                     regulator->debugfs, regulator,
1367                                     &constraint_flags_fops);
1368         }
1369
1370         /*
1371          * Check now if the regulator is an always on regulator - if
1372          * it is then we don't need to do nearly so much work for
1373          * enable/disable calls.
1374          */
1375         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1376             _regulator_is_enabled(rdev))
1377                 regulator->always_on = true;
1378
1379         mutex_unlock(&rdev->mutex);
1380         return regulator;
1381 overflow_err:
1382         list_del(&regulator->list);
1383         kfree(regulator);
1384         mutex_unlock(&rdev->mutex);
1385         return NULL;
1386 }
1387
1388 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1389 {
1390         if (rdev->constraints && rdev->constraints->enable_time)
1391                 return rdev->constraints->enable_time;
1392         if (!rdev->desc->ops->enable_time)
1393                 return rdev->desc->enable_time;
1394         return rdev->desc->ops->enable_time(rdev);
1395 }
1396
1397 static struct regulator_supply_alias *regulator_find_supply_alias(
1398                 struct device *dev, const char *supply)
1399 {
1400         struct regulator_supply_alias *map;
1401
1402         list_for_each_entry(map, &regulator_supply_alias_list, list)
1403                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1404                         return map;
1405
1406         return NULL;
1407 }
1408
1409 static void regulator_supply_alias(struct device **dev, const char **supply)
1410 {
1411         struct regulator_supply_alias *map;
1412
1413         map = regulator_find_supply_alias(*dev, *supply);
1414         if (map) {
1415                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1416                                 *supply, map->alias_supply,
1417                                 dev_name(map->alias_dev));
1418                 *dev = map->alias_dev;
1419                 *supply = map->alias_supply;
1420         }
1421 }
1422
1423 static int regulator_match(struct device *dev, const void *data)
1424 {
1425         struct regulator_dev *r = dev_to_rdev(dev);
1426
1427         return strcmp(rdev_get_name(r), data) == 0;
1428 }
1429
1430 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1431 {
1432         struct device *dev;
1433
1434         dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1435
1436         return dev ? dev_to_rdev(dev) : NULL;
1437 }
1438
1439 /**
1440  * regulator_dev_lookup - lookup a regulator device.
1441  * @dev: device for regulator "consumer".
1442  * @supply: Supply name or regulator ID.
1443  *
1444  * If successful, returns a struct regulator_dev that corresponds to the name
1445  * @supply and with the embedded struct device refcount incremented by one.
1446  * The refcount must be dropped by calling put_device().
1447  * On failure one of the following ERR-PTR-encoded values is returned:
1448  * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1449  * in the future.
1450  */
1451 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1452                                                   const char *supply)
1453 {
1454         struct regulator_dev *r = NULL;
1455         struct device_node *node;
1456         struct regulator_map *map;
1457         const char *devname = NULL;
1458
1459         regulator_supply_alias(&dev, &supply);
1460
1461         /* first do a dt based lookup */
1462         if (dev && dev->of_node) {
1463                 node = of_get_regulator(dev, supply);
1464                 if (node) {
1465                         r = of_find_regulator_by_node(node);
1466                         if (r)
1467                                 return r;
1468
1469                         /*
1470                          * We have a node, but there is no device.
1471                          * assume it has not registered yet.
1472                          */
1473                         return ERR_PTR(-EPROBE_DEFER);
1474                 }
1475         }
1476
1477         /* if not found, try doing it non-dt way */
1478         if (dev)
1479                 devname = dev_name(dev);
1480
1481         mutex_lock(&regulator_list_mutex);
1482         list_for_each_entry(map, &regulator_map_list, list) {
1483                 /* If the mapping has a device set up it must match */
1484                 if (map->dev_name &&
1485                     (!devname || strcmp(map->dev_name, devname)))
1486                         continue;
1487
1488                 if (strcmp(map->supply, supply) == 0 &&
1489                     get_device(&map->regulator->dev)) {
1490                         r = map->regulator;
1491                         break;
1492                 }
1493         }
1494         mutex_unlock(&regulator_list_mutex);
1495
1496         if (r)
1497                 return r;
1498
1499         r = regulator_lookup_by_name(supply);
1500         if (r)
1501                 return r;
1502
1503         return ERR_PTR(-ENODEV);
1504 }
1505
1506 static int regulator_resolve_supply(struct regulator_dev *rdev)
1507 {
1508         struct regulator_dev *r;
1509         struct device *dev = rdev->dev.parent;
1510         int ret;
1511
1512         /* No supply to resovle? */
1513         if (!rdev->supply_name)
1514                 return 0;
1515
1516         /* Supply already resolved? */
1517         if (rdev->supply)
1518                 return 0;
1519
1520         r = regulator_dev_lookup(dev, rdev->supply_name);
1521         if (IS_ERR(r)) {
1522                 ret = PTR_ERR(r);
1523
1524                 /* Did the lookup explicitly defer for us? */
1525                 if (ret == -EPROBE_DEFER)
1526                         return ret;
1527
1528                 if (have_full_constraints()) {
1529                         r = dummy_regulator_rdev;
1530                         get_device(&r->dev);
1531                 } else {
1532                         dev_err(dev, "Failed to resolve %s-supply for %s\n",
1533                                 rdev->supply_name, rdev->desc->name);
1534                         return -EPROBE_DEFER;
1535                 }
1536         }
1537
1538         /*
1539          * If the supply's parent device is not the same as the
1540          * regulator's parent device, then ensure the parent device
1541          * is bound before we resolve the supply, in case the parent
1542          * device get probe deferred and unregisters the supply.
1543          */
1544         if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1545                 if (!device_is_bound(r->dev.parent)) {
1546                         put_device(&r->dev);
1547                         return -EPROBE_DEFER;
1548                 }
1549         }
1550
1551         /* Recursively resolve the supply of the supply */
1552         ret = regulator_resolve_supply(r);
1553         if (ret < 0) {
1554                 put_device(&r->dev);
1555                 return ret;
1556         }
1557
1558         ret = set_supply(rdev, r);
1559         if (ret < 0) {
1560                 put_device(&r->dev);
1561                 return ret;
1562         }
1563
1564         /* Cascade always-on state to supply */
1565         if (_regulator_is_enabled(rdev)) {
1566                 ret = regulator_enable(rdev->supply);
1567                 if (ret < 0) {
1568                         _regulator_put(rdev->supply);
1569                         rdev->supply = NULL;
1570                         return ret;
1571                 }
1572         }
1573
1574         return 0;
1575 }
1576
1577 /* Internal regulator request function */
1578 struct regulator *_regulator_get(struct device *dev, const char *id,
1579                                  enum regulator_get_type get_type)
1580 {
1581         struct regulator_dev *rdev;
1582         struct regulator *regulator;
1583         const char *devname = dev ? dev_name(dev) : "deviceless";
1584         int ret;
1585
1586         if (get_type >= MAX_GET_TYPE) {
1587                 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1588                 return ERR_PTR(-EINVAL);
1589         }
1590
1591         if (id == NULL) {
1592                 pr_err("get() with no identifier\n");
1593                 return ERR_PTR(-EINVAL);
1594         }
1595
1596         rdev = regulator_dev_lookup(dev, id);
1597         if (IS_ERR(rdev)) {
1598                 ret = PTR_ERR(rdev);
1599
1600                 /*
1601                  * If regulator_dev_lookup() fails with error other
1602                  * than -ENODEV our job here is done, we simply return it.
1603                  */
1604                 if (ret != -ENODEV)
1605                         return ERR_PTR(ret);
1606
1607                 if (!have_full_constraints()) {
1608                         dev_warn(dev,
1609                                  "incomplete constraints, dummy supplies not allowed\n");
1610                         return ERR_PTR(-ENODEV);
1611                 }
1612
1613                 switch (get_type) {
1614                 case NORMAL_GET:
1615                         /*
1616                          * Assume that a regulator is physically present and
1617                          * enabled, even if it isn't hooked up, and just
1618                          * provide a dummy.
1619                          */
1620                         dev_warn(dev,
1621                                  "%s supply %s not found, using dummy regulator\n",
1622                                  devname, id);
1623                         rdev = dummy_regulator_rdev;
1624                         get_device(&rdev->dev);
1625                         break;
1626
1627                 case EXCLUSIVE_GET:
1628                         dev_warn(dev,
1629                                  "dummy supplies not allowed for exclusive requests\n");
1630                         /* fall through */
1631
1632                 default:
1633                         return ERR_PTR(-ENODEV);
1634                 }
1635         }
1636
1637         if (rdev->exclusive) {
1638                 regulator = ERR_PTR(-EPERM);
1639                 put_device(&rdev->dev);
1640                 return regulator;
1641         }
1642
1643         if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1644                 regulator = ERR_PTR(-EBUSY);
1645                 put_device(&rdev->dev);
1646                 return regulator;
1647         }
1648
1649         ret = regulator_resolve_supply(rdev);
1650         if (ret < 0) {
1651                 regulator = ERR_PTR(ret);
1652                 put_device(&rdev->dev);
1653                 return regulator;
1654         }
1655
1656         if (!try_module_get(rdev->owner)) {
1657                 regulator = ERR_PTR(-EPROBE_DEFER);
1658                 put_device(&rdev->dev);
1659                 return regulator;
1660         }
1661
1662         regulator = create_regulator(rdev, dev, id);
1663         if (regulator == NULL) {
1664                 regulator = ERR_PTR(-ENOMEM);
1665                 put_device(&rdev->dev);
1666                 module_put(rdev->owner);
1667                 return regulator;
1668         }
1669
1670         rdev->open_count++;
1671         if (get_type == EXCLUSIVE_GET) {
1672                 rdev->exclusive = 1;
1673
1674                 ret = _regulator_is_enabled(rdev);
1675                 if (ret > 0)
1676                         rdev->use_count = 1;
1677                 else
1678                         rdev->use_count = 0;
1679         }
1680
1681         return regulator;
1682 }
1683
1684 /**
1685  * regulator_get - lookup and obtain a reference to a regulator.
1686  * @dev: device for regulator "consumer"
1687  * @id: Supply name or regulator ID.
1688  *
1689  * Returns a struct regulator corresponding to the regulator producer,
1690  * or IS_ERR() condition containing errno.
1691  *
1692  * Use of supply names configured via regulator_set_device_supply() is
1693  * strongly encouraged.  It is recommended that the supply name used
1694  * should match the name used for the supply and/or the relevant
1695  * device pins in the datasheet.
1696  */
1697 struct regulator *regulator_get(struct device *dev, const char *id)
1698 {
1699         return _regulator_get(dev, id, NORMAL_GET);
1700 }
1701 EXPORT_SYMBOL_GPL(regulator_get);
1702
1703 /**
1704  * regulator_get_exclusive - obtain exclusive access to a regulator.
1705  * @dev: device for regulator "consumer"
1706  * @id: Supply name or regulator ID.
1707  *
1708  * Returns a struct regulator corresponding to the regulator producer,
1709  * or IS_ERR() condition containing errno.  Other consumers will be
1710  * unable to obtain this regulator while this reference is held and the
1711  * use count for the regulator will be initialised to reflect the current
1712  * state of the regulator.
1713  *
1714  * This is intended for use by consumers which cannot tolerate shared
1715  * use of the regulator such as those which need to force the
1716  * regulator off for correct operation of the hardware they are
1717  * controlling.
1718  *
1719  * Use of supply names configured via regulator_set_device_supply() is
1720  * strongly encouraged.  It is recommended that the supply name used
1721  * should match the name used for the supply and/or the relevant
1722  * device pins in the datasheet.
1723  */
1724 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1725 {
1726         return _regulator_get(dev, id, EXCLUSIVE_GET);
1727 }
1728 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1729
1730 /**
1731  * regulator_get_optional - obtain optional access to a regulator.
1732  * @dev: device for regulator "consumer"
1733  * @id: Supply name or regulator ID.
1734  *
1735  * Returns a struct regulator corresponding to the regulator producer,
1736  * or IS_ERR() condition containing errno.
1737  *
1738  * This is intended for use by consumers for devices which can have
1739  * some supplies unconnected in normal use, such as some MMC devices.
1740  * It can allow the regulator core to provide stub supplies for other
1741  * supplies requested using normal regulator_get() calls without
1742  * disrupting the operation of drivers that can handle absent
1743  * supplies.
1744  *
1745  * Use of supply names configured via regulator_set_device_supply() is
1746  * strongly encouraged.  It is recommended that the supply name used
1747  * should match the name used for the supply and/or the relevant
1748  * device pins in the datasheet.
1749  */
1750 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1751 {
1752         return _regulator_get(dev, id, OPTIONAL_GET);
1753 }
1754 EXPORT_SYMBOL_GPL(regulator_get_optional);
1755
1756 /* regulator_list_mutex lock held by regulator_put() */
1757 static void _regulator_put(struct regulator *regulator)
1758 {
1759         struct regulator_dev *rdev;
1760
1761         if (IS_ERR_OR_NULL(regulator))
1762                 return;
1763
1764         lockdep_assert_held_once(&regulator_list_mutex);
1765
1766         rdev = regulator->rdev;
1767
1768         debugfs_remove_recursive(regulator->debugfs);
1769
1770         /* remove any sysfs entries */
1771         if (regulator->dev)
1772                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1773         mutex_lock(&rdev->mutex);
1774         list_del(&regulator->list);
1775
1776         rdev->open_count--;
1777         rdev->exclusive = 0;
1778         put_device(&rdev->dev);
1779         mutex_unlock(&rdev->mutex);
1780
1781         kfree_const(regulator->supply_name);
1782         kfree(regulator);
1783
1784         module_put(rdev->owner);
1785 }
1786
1787 /**
1788  * regulator_put - "free" the regulator source
1789  * @regulator: regulator source
1790  *
1791  * Note: drivers must ensure that all regulator_enable calls made on this
1792  * regulator source are balanced by regulator_disable calls prior to calling
1793  * this function.
1794  */
1795 void regulator_put(struct regulator *regulator)
1796 {
1797         mutex_lock(&regulator_list_mutex);
1798         _regulator_put(regulator);
1799         mutex_unlock(&regulator_list_mutex);
1800 }
1801 EXPORT_SYMBOL_GPL(regulator_put);
1802
1803 /**
1804  * regulator_register_supply_alias - Provide device alias for supply lookup
1805  *
1806  * @dev: device that will be given as the regulator "consumer"
1807  * @id: Supply name or regulator ID
1808  * @alias_dev: device that should be used to lookup the supply
1809  * @alias_id: Supply name or regulator ID that should be used to lookup the
1810  * supply
1811  *
1812  * All lookups for id on dev will instead be conducted for alias_id on
1813  * alias_dev.
1814  */
1815 int regulator_register_supply_alias(struct device *dev, const char *id,
1816                                     struct device *alias_dev,
1817                                     const char *alias_id)
1818 {
1819         struct regulator_supply_alias *map;
1820
1821         map = regulator_find_supply_alias(dev, id);
1822         if (map)
1823                 return -EEXIST;
1824
1825         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1826         if (!map)
1827                 return -ENOMEM;
1828
1829         map->src_dev = dev;
1830         map->src_supply = id;
1831         map->alias_dev = alias_dev;
1832         map->alias_supply = alias_id;
1833
1834         list_add(&map->list, &regulator_supply_alias_list);
1835
1836         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1837                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1838
1839         return 0;
1840 }
1841 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1842
1843 /**
1844  * regulator_unregister_supply_alias - Remove device alias
1845  *
1846  * @dev: device that will be given as the regulator "consumer"
1847  * @id: Supply name or regulator ID
1848  *
1849  * Remove a lookup alias if one exists for id on dev.
1850  */
1851 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1852 {
1853         struct regulator_supply_alias *map;
1854
1855         map = regulator_find_supply_alias(dev, id);
1856         if (map) {
1857                 list_del(&map->list);
1858                 kfree(map);
1859         }
1860 }
1861 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1862
1863 /**
1864  * regulator_bulk_register_supply_alias - register multiple aliases
1865  *
1866  * @dev: device that will be given as the regulator "consumer"
1867  * @id: List of supply names or regulator IDs
1868  * @alias_dev: device that should be used to lookup the supply
1869  * @alias_id: List of supply names or regulator IDs that should be used to
1870  * lookup the supply
1871  * @num_id: Number of aliases to register
1872  *
1873  * @return 0 on success, an errno on failure.
1874  *
1875  * This helper function allows drivers to register several supply
1876  * aliases in one operation.  If any of the aliases cannot be
1877  * registered any aliases that were registered will be removed
1878  * before returning to the caller.
1879  */
1880 int regulator_bulk_register_supply_alias(struct device *dev,
1881                                          const char *const *id,
1882                                          struct device *alias_dev,
1883                                          const char *const *alias_id,
1884                                          int num_id)
1885 {
1886         int i;
1887         int ret;
1888
1889         for (i = 0; i < num_id; ++i) {
1890                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1891                                                       alias_id[i]);
1892                 if (ret < 0)
1893                         goto err;
1894         }
1895
1896         return 0;
1897
1898 err:
1899         dev_err(dev,
1900                 "Failed to create supply alias %s,%s -> %s,%s\n",
1901                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1902
1903         while (--i >= 0)
1904                 regulator_unregister_supply_alias(dev, id[i]);
1905
1906         return ret;
1907 }
1908 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1909
1910 /**
1911  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1912  *
1913  * @dev: device that will be given as the regulator "consumer"
1914  * @id: List of supply names or regulator IDs
1915  * @num_id: Number of aliases to unregister
1916  *
1917  * This helper function allows drivers to unregister several supply
1918  * aliases in one operation.
1919  */
1920 void regulator_bulk_unregister_supply_alias(struct device *dev,
1921                                             const char *const *id,
1922                                             int num_id)
1923 {
1924         int i;
1925
1926         for (i = 0; i < num_id; ++i)
1927                 regulator_unregister_supply_alias(dev, id[i]);
1928 }
1929 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1930
1931
1932 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1933 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1934                                 const struct regulator_config *config)
1935 {
1936         struct regulator_enable_gpio *pin;
1937         struct gpio_desc *gpiod;
1938         int ret;
1939
1940         gpiod = gpio_to_desc(config->ena_gpio);
1941
1942         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1943                 if (pin->gpiod == gpiod) {
1944                         rdev_dbg(rdev, "GPIO %d is already used\n",
1945                                 config->ena_gpio);
1946                         goto update_ena_gpio_to_rdev;
1947                 }
1948         }
1949
1950         ret = gpio_request_one(config->ena_gpio,
1951                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1952                                 rdev_get_name(rdev));
1953         if (ret)
1954                 return ret;
1955
1956         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1957         if (pin == NULL) {
1958                 gpio_free(config->ena_gpio);
1959                 return -ENOMEM;
1960         }
1961
1962         pin->gpiod = gpiod;
1963         pin->ena_gpio_invert = config->ena_gpio_invert;
1964         list_add(&pin->list, &regulator_ena_gpio_list);
1965
1966 update_ena_gpio_to_rdev:
1967         pin->request_count++;
1968         rdev->ena_pin = pin;
1969         return 0;
1970 }
1971
1972 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1973 {
1974         struct regulator_enable_gpio *pin, *n;
1975
1976         if (!rdev->ena_pin)
1977                 return;
1978
1979         /* Free the GPIO only in case of no use */
1980         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1981                 if (pin->gpiod == rdev->ena_pin->gpiod) {
1982                         if (pin->request_count <= 1) {
1983                                 pin->request_count = 0;
1984                                 gpiod_put(pin->gpiod);
1985                                 list_del(&pin->list);
1986                                 kfree(pin);
1987                                 rdev->ena_pin = NULL;
1988                                 return;
1989                         } else {
1990                                 pin->request_count--;
1991                         }
1992                 }
1993         }
1994 }
1995
1996 /**
1997  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1998  * @rdev: regulator_dev structure
1999  * @enable: enable GPIO at initial use?
2000  *
2001  * GPIO is enabled in case of initial use. (enable_count is 0)
2002  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2003  */
2004 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2005 {
2006         struct regulator_enable_gpio *pin = rdev->ena_pin;
2007
2008         if (!pin)
2009                 return -EINVAL;
2010
2011         if (enable) {
2012                 /* Enable GPIO at initial use */
2013                 if (pin->enable_count == 0)
2014                         gpiod_set_value_cansleep(pin->gpiod,
2015                                                  !pin->ena_gpio_invert);
2016
2017                 pin->enable_count++;
2018         } else {
2019                 if (pin->enable_count > 1) {
2020                         pin->enable_count--;
2021                         return 0;
2022                 }
2023
2024                 /* Disable GPIO if not used */
2025                 if (pin->enable_count <= 1) {
2026                         gpiod_set_value_cansleep(pin->gpiod,
2027                                                  pin->ena_gpio_invert);
2028                         pin->enable_count = 0;
2029                 }
2030         }
2031
2032         return 0;
2033 }
2034
2035 /**
2036  * _regulator_enable_delay - a delay helper function
2037  * @delay: time to delay in microseconds
2038  *
2039  * Delay for the requested amount of time as per the guidelines in:
2040  *
2041  *     Documentation/timers/timers-howto.txt
2042  *
2043  * The assumption here is that regulators will never be enabled in
2044  * atomic context and therefore sleeping functions can be used.
2045  */
2046 static void _regulator_enable_delay(unsigned int delay)
2047 {
2048         unsigned int ms = delay / 1000;
2049         unsigned int us = delay % 1000;
2050
2051         if (ms > 0) {
2052                 /*
2053                  * For small enough values, handle super-millisecond
2054                  * delays in the usleep_range() call below.
2055                  */
2056                 if (ms < 20)
2057                         us += ms * 1000;
2058                 else
2059                         msleep(ms);
2060         }
2061
2062         /*
2063          * Give the scheduler some room to coalesce with any other
2064          * wakeup sources. For delays shorter than 10 us, don't even
2065          * bother setting up high-resolution timers and just busy-
2066          * loop.
2067          */
2068         if (us >= 10)
2069                 usleep_range(us, us + 100);
2070         else
2071                 udelay(us);
2072 }
2073
2074 static int _regulator_do_enable(struct regulator_dev *rdev)
2075 {
2076         int ret, delay;
2077
2078         /* Query before enabling in case configuration dependent.  */
2079         ret = _regulator_get_enable_time(rdev);
2080         if (ret >= 0) {
2081                 delay = ret;
2082         } else {
2083                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2084                 delay = 0;
2085         }
2086
2087         trace_regulator_enable(rdev_get_name(rdev));
2088
2089         if (rdev->desc->off_on_delay) {
2090                 /* if needed, keep a distance of off_on_delay from last time
2091                  * this regulator was disabled.
2092                  */
2093                 unsigned long start_jiffy = jiffies;
2094                 unsigned long intended, max_delay, remaining;
2095
2096                 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2097                 intended = rdev->last_off_jiffy + max_delay;
2098
2099                 if (time_before(start_jiffy, intended)) {
2100                         /* calc remaining jiffies to deal with one-time
2101                          * timer wrapping.
2102                          * in case of multiple timer wrapping, either it can be
2103                          * detected by out-of-range remaining, or it cannot be
2104                          * detected and we gets a panelty of
2105                          * _regulator_enable_delay().
2106                          */
2107                         remaining = intended - start_jiffy;
2108                         if (remaining <= max_delay)
2109                                 _regulator_enable_delay(
2110                                                 jiffies_to_usecs(remaining));
2111                 }
2112         }
2113
2114         if (rdev->ena_pin) {
2115                 if (!rdev->ena_gpio_state) {
2116                         ret = regulator_ena_gpio_ctrl(rdev, true);
2117                         if (ret < 0)
2118                                 return ret;
2119                         rdev->ena_gpio_state = 1;
2120                 }
2121         } else if (rdev->desc->ops->enable) {
2122                 ret = rdev->desc->ops->enable(rdev);
2123                 if (ret < 0)
2124                         return ret;
2125         } else {
2126                 return -EINVAL;
2127         }
2128
2129         /* Allow the regulator to ramp; it would be useful to extend
2130          * this for bulk operations so that the regulators can ramp
2131          * together.  */
2132         trace_regulator_enable_delay(rdev_get_name(rdev));
2133
2134         _regulator_enable_delay(delay);
2135
2136         trace_regulator_enable_complete(rdev_get_name(rdev));
2137
2138         return 0;
2139 }
2140
2141 /* locks held by regulator_enable() */
2142 static int _regulator_enable(struct regulator_dev *rdev)
2143 {
2144         int ret;
2145
2146         lockdep_assert_held_once(&rdev->mutex);
2147
2148         /* check voltage and requested load before enabling */
2149         if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2150                 drms_uA_update(rdev);
2151
2152         if (rdev->use_count == 0) {
2153                 /* The regulator may on if it's not switchable or left on */
2154                 ret = _regulator_is_enabled(rdev);
2155                 if (ret == -EINVAL || ret == 0) {
2156                         if (!regulator_ops_is_valid(rdev,
2157                                         REGULATOR_CHANGE_STATUS))
2158                                 return -EPERM;
2159
2160                         ret = _regulator_do_enable(rdev);
2161                         if (ret < 0)
2162                                 return ret;
2163
2164                         _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2165                                              NULL);
2166                 } else if (ret < 0) {
2167                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2168                         return ret;
2169                 }
2170                 /* Fallthrough on positive return values - already enabled */
2171         }
2172
2173         rdev->use_count++;
2174
2175         return 0;
2176 }
2177
2178 /**
2179  * regulator_enable - enable regulator output
2180  * @regulator: regulator source
2181  *
2182  * Request that the regulator be enabled with the regulator output at
2183  * the predefined voltage or current value.  Calls to regulator_enable()
2184  * must be balanced with calls to regulator_disable().
2185  *
2186  * NOTE: the output value can be set by other drivers, boot loader or may be
2187  * hardwired in the regulator.
2188  */
2189 int regulator_enable(struct regulator *regulator)
2190 {
2191         struct regulator_dev *rdev = regulator->rdev;
2192         int ret = 0;
2193
2194         if (regulator->always_on)
2195                 return 0;
2196
2197         if (rdev->supply) {
2198                 ret = regulator_enable(rdev->supply);
2199                 if (ret != 0)
2200                         return ret;
2201         }
2202
2203         mutex_lock(&rdev->mutex);
2204         ret = _regulator_enable(rdev);
2205         mutex_unlock(&rdev->mutex);
2206
2207         if (ret != 0 && rdev->supply)
2208                 regulator_disable(rdev->supply);
2209
2210         return ret;
2211 }
2212 EXPORT_SYMBOL_GPL(regulator_enable);
2213
2214 static int _regulator_do_disable(struct regulator_dev *rdev)
2215 {
2216         int ret;
2217
2218         trace_regulator_disable(rdev_get_name(rdev));
2219
2220         if (rdev->ena_pin) {
2221                 if (rdev->ena_gpio_state) {
2222                         ret = regulator_ena_gpio_ctrl(rdev, false);
2223                         if (ret < 0)
2224                                 return ret;
2225                         rdev->ena_gpio_state = 0;
2226                 }
2227
2228         } else if (rdev->desc->ops->disable) {
2229                 ret = rdev->desc->ops->disable(rdev);
2230                 if (ret != 0)
2231                         return ret;
2232         }
2233
2234         /* cares about last_off_jiffy only if off_on_delay is required by
2235          * device.
2236          */
2237         if (rdev->desc->off_on_delay)
2238                 rdev->last_off_jiffy = jiffies;
2239
2240         trace_regulator_disable_complete(rdev_get_name(rdev));
2241
2242         return 0;
2243 }
2244
2245 /* locks held by regulator_disable() */
2246 static int _regulator_disable(struct regulator_dev *rdev)
2247 {
2248         int ret = 0;
2249
2250         lockdep_assert_held_once(&rdev->mutex);
2251
2252         if (WARN(rdev->use_count <= 0,
2253                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
2254                 return -EIO;
2255
2256         /* are we the last user and permitted to disable ? */
2257         if (rdev->use_count == 1 &&
2258             (rdev->constraints && !rdev->constraints->always_on)) {
2259
2260                 /* we are last user */
2261                 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2262                         ret = _notifier_call_chain(rdev,
2263                                                    REGULATOR_EVENT_PRE_DISABLE,
2264                                                    NULL);
2265                         if (ret & NOTIFY_STOP_MASK)
2266                                 return -EINVAL;
2267
2268                         ret = _regulator_do_disable(rdev);
2269                         if (ret < 0) {
2270                                 rdev_err(rdev, "failed to disable\n");
2271                                 _notifier_call_chain(rdev,
2272                                                 REGULATOR_EVENT_ABORT_DISABLE,
2273                                                 NULL);
2274                                 return ret;
2275                         }
2276                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2277                                         NULL);
2278                 }
2279
2280                 rdev->use_count = 0;
2281         } else if (rdev->use_count > 1) {
2282                 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2283                         drms_uA_update(rdev);
2284
2285                 rdev->use_count--;
2286         }
2287
2288         return ret;
2289 }
2290
2291 /**
2292  * regulator_disable - disable regulator output
2293  * @regulator: regulator source
2294  *
2295  * Disable the regulator output voltage or current.  Calls to
2296  * regulator_enable() must be balanced with calls to
2297  * regulator_disable().
2298  *
2299  * NOTE: this will only disable the regulator output if no other consumer
2300  * devices have it enabled, the regulator device supports disabling and
2301  * machine constraints permit this operation.
2302  */
2303 int regulator_disable(struct regulator *regulator)
2304 {
2305         struct regulator_dev *rdev = regulator->rdev;
2306         int ret = 0;
2307
2308         if (regulator->always_on)
2309                 return 0;
2310
2311         mutex_lock(&rdev->mutex);
2312         ret = _regulator_disable(rdev);
2313         mutex_unlock(&rdev->mutex);
2314
2315         if (ret == 0 && rdev->supply)
2316                 regulator_disable(rdev->supply);
2317
2318         return ret;
2319 }
2320 EXPORT_SYMBOL_GPL(regulator_disable);
2321
2322 /* locks held by regulator_force_disable() */
2323 static int _regulator_force_disable(struct regulator_dev *rdev)
2324 {
2325         int ret = 0;
2326
2327         lockdep_assert_held_once(&rdev->mutex);
2328
2329         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2330                         REGULATOR_EVENT_PRE_DISABLE, NULL);
2331         if (ret & NOTIFY_STOP_MASK)
2332                 return -EINVAL;
2333
2334         ret = _regulator_do_disable(rdev);
2335         if (ret < 0) {
2336                 rdev_err(rdev, "failed to force disable\n");
2337                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2338                                 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2339                 return ret;
2340         }
2341
2342         _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2343                         REGULATOR_EVENT_DISABLE, NULL);
2344
2345         return 0;
2346 }
2347
2348 /**
2349  * regulator_force_disable - force disable regulator output
2350  * @regulator: regulator source
2351  *
2352  * Forcibly disable the regulator output voltage or current.
2353  * NOTE: this *will* disable the regulator output even if other consumer
2354  * devices have it enabled. This should be used for situations when device
2355  * damage will likely occur if the regulator is not disabled (e.g. over temp).
2356  */
2357 int regulator_force_disable(struct regulator *regulator)
2358 {
2359         struct regulator_dev *rdev = regulator->rdev;
2360         int ret;
2361
2362         mutex_lock(&rdev->mutex);
2363         regulator->uA_load = 0;
2364         ret = _regulator_force_disable(regulator->rdev);
2365         mutex_unlock(&rdev->mutex);
2366
2367         if (rdev->supply)
2368                 while (rdev->open_count--)
2369                         regulator_disable(rdev->supply);
2370
2371         return ret;
2372 }
2373 EXPORT_SYMBOL_GPL(regulator_force_disable);
2374
2375 static void regulator_disable_work(struct work_struct *work)
2376 {
2377         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2378                                                   disable_work.work);
2379         int count, i, ret;
2380
2381         mutex_lock(&rdev->mutex);
2382
2383         BUG_ON(!rdev->deferred_disables);
2384
2385         count = rdev->deferred_disables;
2386         rdev->deferred_disables = 0;
2387
2388         /*
2389          * Workqueue functions queue the new work instance while the previous
2390          * work instance is being processed. Cancel the queued work instance
2391          * as the work instance under processing does the job of the queued
2392          * work instance.
2393          */
2394         cancel_delayed_work(&rdev->disable_work);
2395
2396         for (i = 0; i < count; i++) {
2397                 ret = _regulator_disable(rdev);
2398                 if (ret != 0)
2399                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2400         }
2401
2402         mutex_unlock(&rdev->mutex);
2403
2404         if (rdev->supply) {
2405                 for (i = 0; i < count; i++) {
2406                         ret = regulator_disable(rdev->supply);
2407                         if (ret != 0) {
2408                                 rdev_err(rdev,
2409                                          "Supply disable failed: %d\n", ret);
2410                         }
2411                 }
2412         }
2413 }
2414
2415 /**
2416  * regulator_disable_deferred - disable regulator output with delay
2417  * @regulator: regulator source
2418  * @ms: miliseconds until the regulator is disabled
2419  *
2420  * Execute regulator_disable() on the regulator after a delay.  This
2421  * is intended for use with devices that require some time to quiesce.
2422  *
2423  * NOTE: this will only disable the regulator output if no other consumer
2424  * devices have it enabled, the regulator device supports disabling and
2425  * machine constraints permit this operation.
2426  */
2427 int regulator_disable_deferred(struct regulator *regulator, int ms)
2428 {
2429         struct regulator_dev *rdev = regulator->rdev;
2430
2431         if (regulator->always_on)
2432                 return 0;
2433
2434         if (!ms)
2435                 return regulator_disable(regulator);
2436
2437         mutex_lock(&rdev->mutex);
2438         rdev->deferred_disables++;
2439         mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2440                          msecs_to_jiffies(ms));
2441         mutex_unlock(&rdev->mutex);
2442
2443         return 0;
2444 }
2445 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2446
2447 static int _regulator_is_enabled(struct regulator_dev *rdev)
2448 {
2449         /* A GPIO control always takes precedence */
2450         if (rdev->ena_pin)
2451                 return rdev->ena_gpio_state;
2452
2453         /* If we don't know then assume that the regulator is always on */
2454         if (!rdev->desc->ops->is_enabled)
2455                 return 1;
2456
2457         return rdev->desc->ops->is_enabled(rdev);
2458 }
2459
2460 static int _regulator_list_voltage(struct regulator_dev *rdev,
2461                                    unsigned selector, int lock)
2462 {
2463         const struct regulator_ops *ops = rdev->desc->ops;
2464         int ret;
2465
2466         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2467                 return rdev->desc->fixed_uV;
2468
2469         if (ops->list_voltage) {
2470                 if (selector >= rdev->desc->n_voltages)
2471                         return -EINVAL;
2472                 if (lock)
2473                         mutex_lock(&rdev->mutex);
2474                 ret = ops->list_voltage(rdev, selector);
2475                 if (lock)
2476                         mutex_unlock(&rdev->mutex);
2477         } else if (rdev->is_switch && rdev->supply) {
2478                 ret = _regulator_list_voltage(rdev->supply->rdev,
2479                                               selector, lock);
2480         } else {
2481                 return -EINVAL;
2482         }
2483
2484         if (ret > 0) {
2485                 if (ret < rdev->constraints->min_uV)
2486                         ret = 0;
2487                 else if (ret > rdev->constraints->max_uV)
2488                         ret = 0;
2489         }
2490
2491         return ret;
2492 }
2493
2494 /**
2495  * regulator_is_enabled - is the regulator output enabled
2496  * @regulator: regulator source
2497  *
2498  * Returns positive if the regulator driver backing the source/client
2499  * has requested that the device be enabled, zero if it hasn't, else a
2500  * negative errno code.
2501  *
2502  * Note that the device backing this regulator handle can have multiple
2503  * users, so it might be enabled even if regulator_enable() was never
2504  * called for this particular source.
2505  */
2506 int regulator_is_enabled(struct regulator *regulator)
2507 {
2508         int ret;
2509
2510         if (regulator->always_on)
2511                 return 1;
2512
2513         mutex_lock(&regulator->rdev->mutex);
2514         ret = _regulator_is_enabled(regulator->rdev);
2515         mutex_unlock(&regulator->rdev->mutex);
2516
2517         return ret;
2518 }
2519 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2520
2521 /**
2522  * regulator_count_voltages - count regulator_list_voltage() selectors
2523  * @regulator: regulator source
2524  *
2525  * Returns number of selectors, or negative errno.  Selectors are
2526  * numbered starting at zero, and typically correspond to bitfields
2527  * in hardware registers.
2528  */
2529 int regulator_count_voltages(struct regulator *regulator)
2530 {
2531         struct regulator_dev    *rdev = regulator->rdev;
2532
2533         if (rdev->desc->n_voltages)
2534                 return rdev->desc->n_voltages;
2535
2536         if (!rdev->is_switch || !rdev->supply)
2537                 return -EINVAL;
2538
2539         return regulator_count_voltages(rdev->supply);
2540 }
2541 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2542
2543 /**
2544  * regulator_list_voltage - enumerate supported voltages
2545  * @regulator: regulator source
2546  * @selector: identify voltage to list
2547  * Context: can sleep
2548  *
2549  * Returns a voltage that can be passed to @regulator_set_voltage(),
2550  * zero if this selector code can't be used on this system, or a
2551  * negative errno.
2552  */
2553 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2554 {
2555         return _regulator_list_voltage(regulator->rdev, selector, 1);
2556 }
2557 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2558
2559 /**
2560  * regulator_get_regmap - get the regulator's register map
2561  * @regulator: regulator source
2562  *
2563  * Returns the register map for the given regulator, or an ERR_PTR value
2564  * if the regulator doesn't use regmap.
2565  */
2566 struct regmap *regulator_get_regmap(struct regulator *regulator)
2567 {
2568         struct regmap *map = regulator->rdev->regmap;
2569
2570         return map ? map : ERR_PTR(-EOPNOTSUPP);
2571 }
2572
2573 /**
2574  * regulator_get_hardware_vsel_register - get the HW voltage selector register
2575  * @regulator: regulator source
2576  * @vsel_reg: voltage selector register, output parameter
2577  * @vsel_mask: mask for voltage selector bitfield, output parameter
2578  *
2579  * Returns the hardware register offset and bitmask used for setting the
2580  * regulator voltage. This might be useful when configuring voltage-scaling
2581  * hardware or firmware that can make I2C requests behind the kernel's back,
2582  * for example.
2583  *
2584  * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2585  * and 0 is returned, otherwise a negative errno is returned.
2586  */
2587 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2588                                          unsigned *vsel_reg,
2589                                          unsigned *vsel_mask)
2590 {
2591         struct regulator_dev *rdev = regulator->rdev;
2592         const struct regulator_ops *ops = rdev->desc->ops;
2593
2594         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2595                 return -EOPNOTSUPP;
2596
2597         *vsel_reg = rdev->desc->vsel_reg;
2598         *vsel_mask = rdev->desc->vsel_mask;
2599
2600          return 0;
2601 }
2602 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2603
2604 /**
2605  * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2606  * @regulator: regulator source
2607  * @selector: identify voltage to list
2608  *
2609  * Converts the selector to a hardware-specific voltage selector that can be
2610  * directly written to the regulator registers. The address of the voltage
2611  * register can be determined by calling @regulator_get_hardware_vsel_register.
2612  *
2613  * On error a negative errno is returned.
2614  */
2615 int regulator_list_hardware_vsel(struct regulator *regulator,
2616                                  unsigned selector)
2617 {
2618         struct regulator_dev *rdev = regulator->rdev;
2619         const struct regulator_ops *ops = rdev->desc->ops;
2620
2621         if (selector >= rdev->desc->n_voltages)
2622                 return -EINVAL;
2623         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2624                 return -EOPNOTSUPP;
2625
2626         return selector;
2627 }
2628 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2629
2630 /**
2631  * regulator_get_linear_step - return the voltage step size between VSEL values
2632  * @regulator: regulator source
2633  *
2634  * Returns the voltage step size between VSEL values for linear
2635  * regulators, or return 0 if the regulator isn't a linear regulator.
2636  */
2637 unsigned int regulator_get_linear_step(struct regulator *regulator)
2638 {
2639         struct regulator_dev *rdev = regulator->rdev;
2640
2641         return rdev->desc->uV_step;
2642 }
2643 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2644
2645 /**
2646  * regulator_is_supported_voltage - check if a voltage range can be supported
2647  *
2648  * @regulator: Regulator to check.
2649  * @min_uV: Minimum required voltage in uV.
2650  * @max_uV: Maximum required voltage in uV.
2651  *
2652  * Returns a boolean or a negative error code.
2653  */
2654 int regulator_is_supported_voltage(struct regulator *regulator,
2655                                    int min_uV, int max_uV)
2656 {
2657         struct regulator_dev *rdev = regulator->rdev;
2658         int i, voltages, ret;
2659
2660         /* If we can't change voltage check the current voltage */
2661         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2662                 ret = regulator_get_voltage(regulator);
2663                 if (ret >= 0)
2664                         return min_uV <= ret && ret <= max_uV;
2665                 else
2666                         return ret;
2667         }
2668
2669         /* Any voltage within constrains range is fine? */
2670         if (rdev->desc->continuous_voltage_range)
2671                 return min_uV >= rdev->constraints->min_uV &&
2672                                 max_uV <= rdev->constraints->max_uV;
2673
2674         ret = regulator_count_voltages(regulator);
2675         if (ret < 0)
2676                 return ret;
2677         voltages = ret;
2678
2679         for (i = 0; i < voltages; i++) {
2680                 ret = regulator_list_voltage(regulator, i);
2681
2682                 if (ret >= min_uV && ret <= max_uV)
2683                         return 1;
2684         }
2685
2686         return 0;
2687 }
2688 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2689
2690 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2691                                  int max_uV)
2692 {
2693         const struct regulator_desc *desc = rdev->desc;
2694
2695         if (desc->ops->map_voltage)
2696                 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2697
2698         if (desc->ops->list_voltage == regulator_list_voltage_linear)
2699                 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2700
2701         if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2702                 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2703
2704         return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2705 }
2706
2707 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2708                                        int min_uV, int max_uV,
2709                                        unsigned *selector)
2710 {
2711         struct pre_voltage_change_data data;
2712         int ret;
2713
2714         data.old_uV = _regulator_get_voltage(rdev);
2715         data.min_uV = min_uV;
2716         data.max_uV = max_uV;
2717         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2718                                    &data);
2719         if (ret & NOTIFY_STOP_MASK)
2720                 return -EINVAL;
2721
2722         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2723         if (ret >= 0)
2724                 return ret;
2725
2726         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2727                              (void *)data.old_uV);
2728
2729         return ret;
2730 }
2731
2732 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2733                                            int uV, unsigned selector)
2734 {
2735         struct pre_voltage_change_data data;
2736         int ret;
2737
2738         data.old_uV = _regulator_get_voltage(rdev);
2739         data.min_uV = uV;
2740         data.max_uV = uV;
2741         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2742                                    &data);
2743         if (ret & NOTIFY_STOP_MASK)
2744                 return -EINVAL;
2745
2746         ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2747         if (ret >= 0)
2748                 return ret;
2749
2750         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2751                              (void *)data.old_uV);
2752
2753         return ret;
2754 }
2755
2756 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2757                                        int old_uV, int new_uV)
2758 {
2759         unsigned int ramp_delay = 0;
2760
2761         if (rdev->constraints->ramp_delay)
2762                 ramp_delay = rdev->constraints->ramp_delay;
2763         else if (rdev->desc->ramp_delay)
2764                 ramp_delay = rdev->desc->ramp_delay;
2765         else if (rdev->constraints->settling_time)
2766                 return rdev->constraints->settling_time;
2767         else if (rdev->constraints->settling_time_up &&
2768                  (new_uV > old_uV))
2769                 return rdev->constraints->settling_time_up;
2770         else if (rdev->constraints->settling_time_down &&
2771                  (new_uV < old_uV))
2772                 return rdev->constraints->settling_time_down;
2773
2774         if (ramp_delay == 0) {
2775                 rdev_dbg(rdev, "ramp_delay not set\n");
2776                 return 0;
2777         }
2778
2779         return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2780 }
2781
2782 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2783                                      int min_uV, int max_uV)
2784 {
2785         int ret;
2786         int delay = 0;
2787         int best_val = 0;
2788         unsigned int selector;
2789         int old_selector = -1;
2790         const struct regulator_ops *ops = rdev->desc->ops;
2791         int old_uV = _regulator_get_voltage(rdev);
2792
2793         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2794
2795         min_uV += rdev->constraints->uV_offset;
2796         max_uV += rdev->constraints->uV_offset;
2797
2798         /*
2799          * If we can't obtain the old selector there is not enough
2800          * info to call set_voltage_time_sel().
2801          */
2802         if (_regulator_is_enabled(rdev) &&
2803             ops->set_voltage_time_sel && ops->get_voltage_sel) {
2804                 old_selector = ops->get_voltage_sel(rdev);
2805                 if (old_selector < 0)
2806                         return old_selector;
2807         }
2808
2809         if (ops->set_voltage) {
2810                 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2811                                                   &selector);
2812
2813                 if (ret >= 0) {
2814                         if (ops->list_voltage)
2815                                 best_val = ops->list_voltage(rdev,
2816                                                              selector);
2817                         else
2818                                 best_val = _regulator_get_voltage(rdev);
2819                 }
2820
2821         } else if (ops->set_voltage_sel) {
2822                 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2823                 if (ret >= 0) {
2824                         best_val = ops->list_voltage(rdev, ret);
2825                         if (min_uV <= best_val && max_uV >= best_val) {
2826                                 selector = ret;
2827                                 if (old_selector == selector)
2828                                         ret = 0;
2829                                 else
2830                                         ret = _regulator_call_set_voltage_sel(
2831                                                 rdev, best_val, selector);
2832                         } else {
2833                                 ret = -EINVAL;
2834                         }
2835                 }
2836         } else {
2837                 ret = -EINVAL;
2838         }
2839
2840         if (ret)
2841                 goto out;
2842
2843         if (ops->set_voltage_time_sel) {
2844                 /*
2845                  * Call set_voltage_time_sel if successfully obtained
2846                  * old_selector
2847                  */
2848                 if (old_selector >= 0 && old_selector != selector)
2849                         delay = ops->set_voltage_time_sel(rdev, old_selector,
2850                                                           selector);
2851         } else {
2852                 if (old_uV != best_val) {
2853                         if (ops->set_voltage_time)
2854                                 delay = ops->set_voltage_time(rdev, old_uV,
2855                                                               best_val);
2856                         else
2857                                 delay = _regulator_set_voltage_time(rdev,
2858                                                                     old_uV,
2859                                                                     best_val);
2860                 }
2861         }
2862
2863         if (delay < 0) {
2864                 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2865                 delay = 0;
2866         }
2867
2868         /* Insert any necessary delays */
2869         if (delay >= 1000) {
2870                 mdelay(delay / 1000);
2871                 udelay(delay % 1000);
2872         } else if (delay) {
2873                 udelay(delay);
2874         }
2875
2876         if (best_val >= 0) {
2877                 unsigned long data = best_val;
2878
2879                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2880                                      (void *)data);
2881         }
2882
2883 out:
2884         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2885
2886         return ret;
2887 }
2888
2889 static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
2890                                   int min_uV, int max_uV, suspend_state_t state)
2891 {
2892         struct regulator_state *rstate;
2893         int uV, sel;
2894
2895         rstate = regulator_get_suspend_state(rdev, state);
2896         if (rstate == NULL)
2897                 return -EINVAL;
2898
2899         if (min_uV < rstate->min_uV)
2900                 min_uV = rstate->min_uV;
2901         if (max_uV > rstate->max_uV)
2902                 max_uV = rstate->max_uV;
2903
2904         sel = regulator_map_voltage(rdev, min_uV, max_uV);
2905         if (sel < 0)
2906                 return sel;
2907
2908         uV = rdev->desc->ops->list_voltage(rdev, sel);
2909         if (uV >= min_uV && uV <= max_uV)
2910                 rstate->uV = uV;
2911
2912         return 0;
2913 }
2914
2915 static int regulator_set_voltage_unlocked(struct regulator *regulator,
2916                                           int min_uV, int max_uV,
2917                                           suspend_state_t state)
2918 {
2919         struct regulator_dev *rdev = regulator->rdev;
2920         struct regulator_voltage *voltage = &regulator->voltage[state];
2921         int ret = 0;
2922         int old_min_uV, old_max_uV;
2923         int current_uV;
2924         int best_supply_uV = 0;
2925         int supply_change_uV = 0;
2926
2927         /* If we're setting the same range as last time the change
2928          * should be a noop (some cpufreq implementations use the same
2929          * voltage for multiple frequencies, for example).
2930          */
2931         if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
2932                 goto out;
2933
2934         /* If we're trying to set a range that overlaps the current voltage,
2935          * return successfully even though the regulator does not support
2936          * changing the voltage.
2937          */
2938         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2939                 current_uV = _regulator_get_voltage(rdev);
2940                 if (min_uV <= current_uV && current_uV <= max_uV) {
2941                         voltage->min_uV = min_uV;
2942                         voltage->max_uV = max_uV;
2943                         goto out;
2944                 }
2945         }
2946
2947         /* sanity check */
2948         if (!rdev->desc->ops->set_voltage &&
2949             !rdev->desc->ops->set_voltage_sel) {
2950                 ret = -EINVAL;
2951                 goto out;
2952         }
2953
2954         /* constraints check */
2955         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2956         if (ret < 0)
2957                 goto out;
2958
2959         /* restore original values in case of error */
2960         old_min_uV = voltage->min_uV;
2961         old_max_uV = voltage->max_uV;
2962         voltage->min_uV = min_uV;
2963         voltage->max_uV = max_uV;
2964
2965         ret = regulator_check_consumers(rdev, &min_uV, &max_uV, state);
2966         if (ret < 0)
2967                 goto out2;
2968
2969         if (rdev->supply &&
2970             regulator_ops_is_valid(rdev->supply->rdev,
2971                                    REGULATOR_CHANGE_VOLTAGE) &&
2972             (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
2973                                            rdev->desc->ops->get_voltage_sel))) {
2974                 int current_supply_uV;
2975                 int selector;
2976
2977                 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2978                 if (selector < 0) {
2979                         ret = selector;
2980                         goto out2;
2981                 }
2982
2983                 best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
2984                 if (best_supply_uV < 0) {
2985                         ret = best_supply_uV;
2986                         goto out2;
2987                 }
2988
2989                 best_supply_uV += rdev->desc->min_dropout_uV;
2990
2991                 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2992                 if (current_supply_uV < 0) {
2993                         ret = current_supply_uV;
2994                         goto out2;
2995                 }
2996
2997                 supply_change_uV = best_supply_uV - current_supply_uV;
2998         }
2999
3000         if (supply_change_uV > 0) {
3001                 ret = regulator_set_voltage_unlocked(rdev->supply,
3002                                 best_supply_uV, INT_MAX, state);
3003                 if (ret) {
3004                         dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
3005                                         ret);
3006                         goto out2;
3007                 }
3008         }
3009
3010         if (state == PM_SUSPEND_ON)
3011                 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3012         else
3013                 ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
3014                                                         max_uV, state);
3015         if (ret < 0)
3016                 goto out2;
3017
3018         if (supply_change_uV < 0) {
3019                 ret = regulator_set_voltage_unlocked(rdev->supply,
3020                                 best_supply_uV, INT_MAX, state);
3021                 if (ret)
3022                         dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
3023                                         ret);
3024                 /* No need to fail here */
3025                 ret = 0;
3026         }
3027
3028 out:
3029         return ret;
3030 out2:
3031         voltage->min_uV = old_min_uV;
3032         voltage->max_uV = old_max_uV;
3033
3034         return ret;
3035 }
3036
3037 /**
3038  * regulator_set_voltage - set regulator output voltage
3039  * @regulator: regulator source
3040  * @min_uV: Minimum required voltage in uV
3041  * @max_uV: Maximum acceptable voltage in uV
3042  *
3043  * Sets a voltage regulator to the desired output voltage. This can be set
3044  * during any regulator state. IOW, regulator can be disabled or enabled.
3045  *
3046  * If the regulator is enabled then the voltage will change to the new value
3047  * immediately otherwise if the regulator is disabled the regulator will
3048  * output at the new voltage when enabled.
3049  *
3050  * NOTE: If the regulator is shared between several devices then the lowest
3051  * request voltage that meets the system constraints will be used.
3052  * Regulator system constraints must be set for this regulator before
3053  * calling this function otherwise this call will fail.
3054  */
3055 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3056 {
3057         int ret = 0;
3058
3059         regulator_lock_supply(regulator->rdev);
3060
3061         ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
3062                                              PM_SUSPEND_ON);
3063
3064         regulator_unlock_supply(regulator->rdev);
3065
3066         return ret;
3067 }
3068 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3069
3070 static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
3071                                            suspend_state_t state, bool en)
3072 {
3073         struct regulator_state *rstate;
3074
3075         rstate = regulator_get_suspend_state(rdev, state);
3076         if (rstate == NULL)
3077                 return -EINVAL;
3078
3079         if (!rstate->changeable)
3080                 return -EPERM;
3081
3082         rstate->enabled = en;
3083
3084         return 0;
3085 }
3086
3087 int regulator_suspend_enable(struct regulator_dev *rdev,
3088                                     suspend_state_t state)
3089 {
3090         return regulator_suspend_toggle(rdev, state, true);
3091 }
3092 EXPORT_SYMBOL_GPL(regulator_suspend_enable);
3093
3094 int regulator_suspend_disable(struct regulator_dev *rdev,
3095                                      suspend_state_t state)
3096 {
3097         struct regulator *regulator;
3098         struct regulator_voltage *voltage;
3099
3100         /*
3101          * if any consumer wants this regulator device keeping on in
3102          * suspend states, don't set it as disabled.
3103          */
3104         list_for_each_entry(regulator, &rdev->consumer_list, list) {
3105                 voltage = &regulator->voltage[state];
3106                 if (voltage->min_uV || voltage->max_uV)
3107                         return 0;
3108         }
3109
3110         return regulator_suspend_toggle(rdev, state, false);
3111 }
3112 EXPORT_SYMBOL_GPL(regulator_suspend_disable);
3113
3114 static int _regulator_set_suspend_voltage(struct regulator *regulator,
3115                                           int min_uV, int max_uV,
3116                                           suspend_state_t state)
3117 {
3118         struct regulator_dev *rdev = regulator->rdev;
3119         struct regulator_state *rstate;
3120
3121         rstate = regulator_get_suspend_state(rdev, state);
3122         if (rstate == NULL)
3123                 return -EINVAL;
3124
3125         if (rstate->min_uV == rstate->max_uV) {
3126                 rdev_err(rdev, "The suspend voltage can't be changed!\n");
3127                 return -EPERM;
3128         }
3129
3130         return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
3131 }
3132
3133 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
3134                                   int max_uV, suspend_state_t state)
3135 {
3136         int ret = 0;
3137
3138         /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
3139         if (regulator_check_states(state) || state == PM_SUSPEND_ON)
3140                 return -EINVAL;
3141
3142         regulator_lock_supply(regulator->rdev);
3143
3144         ret = _regulator_set_suspend_voltage(regulator, min_uV,
3145                                              max_uV, state);
3146
3147         regulator_unlock_supply(regulator->rdev);
3148
3149         return ret;
3150 }
3151 EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
3152
3153 /**
3154  * regulator_set_voltage_time - get raise/fall time
3155  * @regulator: regulator source
3156  * @old_uV: starting voltage in microvolts
3157  * @new_uV: target voltage in microvolts
3158  *
3159  * Provided with the starting and ending voltage, this function attempts to
3160  * calculate the time in microseconds required to rise or fall to this new
3161  * voltage.
3162  */
3163 int regulator_set_voltage_time(struct regulator *regulator,
3164                                int old_uV, int new_uV)
3165 {
3166         struct regulator_dev *rdev = regulator->rdev;
3167         const struct regulator_ops *ops = rdev->desc->ops;
3168         int old_sel = -1;
3169         int new_sel = -1;
3170         int voltage;
3171         int i;
3172
3173         if (ops->set_voltage_time)
3174                 return ops->set_voltage_time(rdev, old_uV, new_uV);
3175         else if (!ops->set_voltage_time_sel)
3176                 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3177
3178         /* Currently requires operations to do this */
3179         if (!ops->list_voltage || !rdev->desc->n_voltages)
3180                 return -EINVAL;
3181
3182         for (i = 0; i < rdev->desc->n_voltages; i++) {
3183                 /* We only look for exact voltage matches here */
3184                 voltage = regulator_list_voltage(regulator, i);
3185                 if (voltage < 0)
3186                         return -EINVAL;
3187                 if (voltage == 0)
3188                         continue;
3189                 if (voltage == old_uV)
3190                         old_sel = i;
3191                 if (voltage == new_uV)
3192                         new_sel = i;
3193         }
3194
3195         if (old_sel < 0 || new_sel < 0)
3196                 return -EINVAL;
3197
3198         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3199 }
3200 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3201
3202 /**
3203  * regulator_set_voltage_time_sel - get raise/fall time
3204  * @rdev: regulator source device
3205  * @old_selector: selector for starting voltage
3206  * @new_selector: selector for target voltage
3207  *
3208  * Provided with the starting and target voltage selectors, this function
3209  * returns time in microseconds required to rise or fall to this new voltage
3210  *
3211  * Drivers providing ramp_delay in regulation_constraints can use this as their
3212  * set_voltage_time_sel() operation.
3213  */
3214 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3215                                    unsigned int old_selector,
3216                                    unsigned int new_selector)
3217 {
3218         int old_volt, new_volt;
3219
3220         /* sanity check */
3221         if (!rdev->desc->ops->list_voltage)
3222                 return -EINVAL;
3223
3224         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3225         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3226
3227         if (rdev->desc->ops->set_voltage_time)
3228                 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3229                                                          new_volt);
3230         else
3231                 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3232 }
3233 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3234