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1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. |
3 | * |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. |
5 | * Copyright 2008 SlimLogic Ltd. |
6 | * |
7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the |
11 | * Free Software Foundation; either version 2 of the License, or (at your |
12 | * option) any later version. |
13 | * |
14 | */ |
15 | |
16 | #include <linux/kernel.h> |
17 | #include <linux/init.h> |
18 | #include <linux/debugfs.h> |
19 | #include <linux/device.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/async.h> |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> |
24 | #include <linux/suspend.h> |
25 | #include <linux/delay.h> |
26 | #include <linux/gpio.h> |
27 | #include <linux/of.h> |
28 | #include <linux/regmap.h> |
29 | #include <linux/regulator/of_regulator.h> |
30 | #include <linux/regulator/consumer.h> |
31 | #include <linux/regulator/driver.h> |
32 | #include <linux/regulator/machine.h> |
33 | #include <linux/module.h> |
34 | |
35 | #define CREATE_TRACE_POINTS |
36 | #include <trace/events/regulator.h> |
37 | |
38 | #include "dummy.h" |
39 | |
40 | #define rdev_crit(rdev, fmt, ...) \ |
41 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) |
42 | #define rdev_err(rdev, fmt, ...) \ |
43 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) |
44 | #define rdev_warn(rdev, fmt, ...) \ |
45 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) |
46 | #define rdev_info(rdev, fmt, ...) \ |
47 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) |
48 | #define rdev_dbg(rdev, fmt, ...) \ |
49 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) |
50 | |
51 | static DEFINE_MUTEX(regulator_list_mutex); |
52 | static LIST_HEAD(regulator_list); |
53 | static LIST_HEAD(regulator_map_list); |
54 | static bool has_full_constraints; |
55 | static bool board_wants_dummy_regulator; |
56 | |
57 | static struct dentry *debugfs_root; |
58 | |
59 | /* |
60 | * struct regulator_map |
61 | * |
62 | * Used to provide symbolic supply names to devices. |
63 | */ |
64 | struct regulator_map { |
65 | struct list_head list; |
66 | const char *dev_name; /* The dev_name() for the consumer */ |
67 | const char *supply; |
68 | struct regulator_dev *regulator; |
69 | }; |
70 | |
71 | /* |
72 | * struct regulator |
73 | * |
74 | * One for each consumer device. |
75 | */ |
76 | struct regulator { |
77 | struct device *dev; |
78 | struct list_head list; |
79 | unsigned int always_on:1; |
80 | unsigned int bypass:1; |
81 | int uA_load; |
82 | int min_uV; |
83 | int max_uV; |
84 | char *supply_name; |
85 | struct device_attribute dev_attr; |
86 | struct regulator_dev *rdev; |
87 | struct dentry *debugfs; |
88 | }; |
89 | |
90 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
91 | static int _regulator_disable(struct regulator_dev *rdev); |
92 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
93 | static int _regulator_get_current_limit(struct regulator_dev *rdev); |
94 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); |
95 | static void _notifier_call_chain(struct regulator_dev *rdev, |
96 | unsigned long event, void *data); |
97 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
98 | int min_uV, int max_uV); |
99 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
100 | struct device *dev, |
101 | const char *supply_name); |
102 | |
103 | static const char *rdev_get_name(struct regulator_dev *rdev) |
104 | { |
105 | if (rdev->constraints && rdev->constraints->name) |
106 | return rdev->constraints->name; |
107 | else if (rdev->desc->name) |
108 | return rdev->desc->name; |
109 | else |
110 | return ""; |
111 | } |
112 | |
113 | /** |
114 | * of_get_regulator - get a regulator device node based on supply name |
115 | * @dev: Device pointer for the consumer (of regulator) device |
116 | * @supply: regulator supply name |
117 | * |
118 | * Extract the regulator device node corresponding to the supply name. |
119 | * retruns the device node corresponding to the regulator if found, else |
120 | * returns NULL. |
121 | */ |
122 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) |
123 | { |
124 | struct device_node *regnode = NULL; |
125 | char prop_name[32]; /* 32 is max size of property name */ |
126 | |
127 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); |
128 | |
129 | snprintf(prop_name, 32, "%s-supply", supply); |
130 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); |
131 | |
132 | if (!regnode) { |
133 | dev_dbg(dev, "Looking up %s property in node %s failed", |
134 | prop_name, dev->of_node->full_name); |
135 | return NULL; |
136 | } |
137 | return regnode; |
138 | } |
139 | |
140 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
141 | { |
142 | if (!rdev->constraints) |
143 | return 0; |
144 | |
145 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) |
146 | return 1; |
147 | else |
148 | return 0; |
149 | } |
150 | |
151 | /* Platform voltage constraint check */ |
152 | static int regulator_check_voltage(struct regulator_dev *rdev, |
153 | int *min_uV, int *max_uV) |
154 | { |
155 | BUG_ON(*min_uV > *max_uV); |
156 | |
157 | if (!rdev->constraints) { |
158 | rdev_err(rdev, "no constraints\n"); |
159 | return -ENODEV; |
160 | } |
161 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
162 | rdev_err(rdev, "operation not allowed\n"); |
163 | return -EPERM; |
164 | } |
165 | |
166 | if (*max_uV > rdev->constraints->max_uV) |
167 | *max_uV = rdev->constraints->max_uV; |
168 | if (*min_uV < rdev->constraints->min_uV) |
169 | *min_uV = rdev->constraints->min_uV; |
170 | |
171 | if (*min_uV > *max_uV) { |
172 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", |
173 | *min_uV, *max_uV); |
174 | return -EINVAL; |
175 | } |
176 | |
177 | return 0; |
178 | } |
179 | |
180 | /* Make sure we select a voltage that suits the needs of all |
181 | * regulator consumers |
182 | */ |
183 | static int regulator_check_consumers(struct regulator_dev *rdev, |
184 | int *min_uV, int *max_uV) |
185 | { |
186 | struct regulator *regulator; |
187 | |
188 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
189 | /* |
190 | * Assume consumers that didn't say anything are OK |
191 | * with anything in the constraint range. |
192 | */ |
193 | if (!regulator->min_uV && !regulator->max_uV) |
194 | continue; |
195 | |
196 | if (*max_uV > regulator->max_uV) |
197 | *max_uV = regulator->max_uV; |
198 | if (*min_uV < regulator->min_uV) |
199 | *min_uV = regulator->min_uV; |
200 | } |
201 | |
202 | if (*min_uV > *max_uV) { |
203 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
204 | *min_uV, *max_uV); |
205 | return -EINVAL; |
206 | } |
207 | |
208 | return 0; |
209 | } |
210 | |
211 | /* current constraint check */ |
212 | static int regulator_check_current_limit(struct regulator_dev *rdev, |
213 | int *min_uA, int *max_uA) |
214 | { |
215 | BUG_ON(*min_uA > *max_uA); |
216 | |
217 | if (!rdev->constraints) { |
218 | rdev_err(rdev, "no constraints\n"); |
219 | return -ENODEV; |
220 | } |
221 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { |
222 | rdev_err(rdev, "operation not allowed\n"); |
223 | return -EPERM; |
224 | } |
225 | |
226 | if (*max_uA > rdev->constraints->max_uA) |
227 | *max_uA = rdev->constraints->max_uA; |
228 | if (*min_uA < rdev->constraints->min_uA) |
229 | *min_uA = rdev->constraints->min_uA; |
230 | |
231 | if (*min_uA > *max_uA) { |
232 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", |
233 | *min_uA, *max_uA); |
234 | return -EINVAL; |
235 | } |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | /* operating mode constraint check */ |
241 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
242 | { |
243 | switch (*mode) { |
244 | case REGULATOR_MODE_FAST: |
245 | case REGULATOR_MODE_NORMAL: |
246 | case REGULATOR_MODE_IDLE: |
247 | case REGULATOR_MODE_STANDBY: |
248 | break; |
249 | default: |
250 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
251 | return -EINVAL; |
252 | } |
253 | |
254 | if (!rdev->constraints) { |
255 | rdev_err(rdev, "no constraints\n"); |
256 | return -ENODEV; |
257 | } |
258 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { |
259 | rdev_err(rdev, "operation not allowed\n"); |
260 | return -EPERM; |
261 | } |
262 | |
263 | /* The modes are bitmasks, the most power hungry modes having |
264 | * the lowest values. If the requested mode isn't supported |
265 | * try higher modes. */ |
266 | while (*mode) { |
267 | if (rdev->constraints->valid_modes_mask & *mode) |
268 | return 0; |
269 | *mode /= 2; |
270 | } |
271 | |
272 | return -EINVAL; |
273 | } |
274 | |
275 | /* dynamic regulator mode switching constraint check */ |
276 | static int regulator_check_drms(struct regulator_dev *rdev) |
277 | { |
278 | if (!rdev->constraints) { |
279 | rdev_err(rdev, "no constraints\n"); |
280 | return -ENODEV; |
281 | } |
282 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { |
283 | rdev_err(rdev, "operation not allowed\n"); |
284 | return -EPERM; |
285 | } |
286 | return 0; |
287 | } |
288 | |
289 | static ssize_t regulator_uV_show(struct device *dev, |
290 | struct device_attribute *attr, char *buf) |
291 | { |
292 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
293 | ssize_t ret; |
294 | |
295 | mutex_lock(&rdev->mutex); |
296 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); |
297 | mutex_unlock(&rdev->mutex); |
298 | |
299 | return ret; |
300 | } |
301 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
302 | |
303 | static ssize_t regulator_uA_show(struct device *dev, |
304 | struct device_attribute *attr, char *buf) |
305 | { |
306 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
307 | |
308 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); |
309 | } |
310 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
311 | |
312 | static ssize_t regulator_name_show(struct device *dev, |
313 | struct device_attribute *attr, char *buf) |
314 | { |
315 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
316 | |
317 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
318 | } |
319 | |
320 | static ssize_t regulator_print_opmode(char *buf, int mode) |
321 | { |
322 | switch (mode) { |
323 | case REGULATOR_MODE_FAST: |
324 | return sprintf(buf, "fast\n"); |
325 | case REGULATOR_MODE_NORMAL: |
326 | return sprintf(buf, "normal\n"); |
327 | case REGULATOR_MODE_IDLE: |
328 | return sprintf(buf, "idle\n"); |
329 | case REGULATOR_MODE_STANDBY: |
330 | return sprintf(buf, "standby\n"); |
331 | } |
332 | return sprintf(buf, "unknown\n"); |
333 | } |
334 | |
335 | static ssize_t regulator_opmode_show(struct device *dev, |
336 | struct device_attribute *attr, char *buf) |
337 | { |
338 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
339 | |
340 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
341 | } |
342 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
343 | |
344 | static ssize_t regulator_print_state(char *buf, int state) |
345 | { |
346 | if (state > 0) |
347 | return sprintf(buf, "enabled\n"); |
348 | else if (state == 0) |
349 | return sprintf(buf, "disabled\n"); |
350 | else |
351 | return sprintf(buf, "unknown\n"); |
352 | } |
353 | |
354 | static ssize_t regulator_state_show(struct device *dev, |
355 | struct device_attribute *attr, char *buf) |
356 | { |
357 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
358 | ssize_t ret; |
359 | |
360 | mutex_lock(&rdev->mutex); |
361 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
362 | mutex_unlock(&rdev->mutex); |
363 | |
364 | return ret; |
365 | } |
366 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
367 | |
368 | static ssize_t regulator_status_show(struct device *dev, |
369 | struct device_attribute *attr, char *buf) |
370 | { |
371 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
372 | int status; |
373 | char *label; |
374 | |
375 | status = rdev->desc->ops->get_status(rdev); |
376 | if (status < 0) |
377 | return status; |
378 | |
379 | switch (status) { |
380 | case REGULATOR_STATUS_OFF: |
381 | label = "off"; |
382 | break; |
383 | case REGULATOR_STATUS_ON: |
384 | label = "on"; |
385 | break; |
386 | case REGULATOR_STATUS_ERROR: |
387 | label = "error"; |
388 | break; |
389 | case REGULATOR_STATUS_FAST: |
390 | label = "fast"; |
391 | break; |
392 | case REGULATOR_STATUS_NORMAL: |
393 | label = "normal"; |
394 | break; |
395 | case REGULATOR_STATUS_IDLE: |
396 | label = "idle"; |
397 | break; |
398 | case REGULATOR_STATUS_STANDBY: |
399 | label = "standby"; |
400 | break; |
401 | case REGULATOR_STATUS_BYPASS: |
402 | label = "bypass"; |
403 | break; |
404 | case REGULATOR_STATUS_UNDEFINED: |
405 | label = "undefined"; |
406 | break; |
407 | default: |
408 | return -ERANGE; |
409 | } |
410 | |
411 | return sprintf(buf, "%s\n", label); |
412 | } |
413 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); |
414 | |
415 | static ssize_t regulator_min_uA_show(struct device *dev, |
416 | struct device_attribute *attr, char *buf) |
417 | { |
418 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
419 | |
420 | if (!rdev->constraints) |
421 | return sprintf(buf, "constraint not defined\n"); |
422 | |
423 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); |
424 | } |
425 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
426 | |
427 | static ssize_t regulator_max_uA_show(struct device *dev, |
428 | struct device_attribute *attr, char *buf) |
429 | { |
430 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
431 | |
432 | if (!rdev->constraints) |
433 | return sprintf(buf, "constraint not defined\n"); |
434 | |
435 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); |
436 | } |
437 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
438 | |
439 | static ssize_t regulator_min_uV_show(struct device *dev, |
440 | struct device_attribute *attr, char *buf) |
441 | { |
442 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
443 | |
444 | if (!rdev->constraints) |
445 | return sprintf(buf, "constraint not defined\n"); |
446 | |
447 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); |
448 | } |
449 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
450 | |
451 | static ssize_t regulator_max_uV_show(struct device *dev, |
452 | struct device_attribute *attr, char *buf) |
453 | { |
454 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
455 | |
456 | if (!rdev->constraints) |
457 | return sprintf(buf, "constraint not defined\n"); |
458 | |
459 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); |
460 | } |
461 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
462 | |
463 | static ssize_t regulator_total_uA_show(struct device *dev, |
464 | struct device_attribute *attr, char *buf) |
465 | { |
466 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
467 | struct regulator *regulator; |
468 | int uA = 0; |
469 | |
470 | mutex_lock(&rdev->mutex); |
471 | list_for_each_entry(regulator, &rdev->consumer_list, list) |
472 | uA += regulator->uA_load; |
473 | mutex_unlock(&rdev->mutex); |
474 | return sprintf(buf, "%d\n", uA); |
475 | } |
476 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
477 | |
478 | static ssize_t regulator_num_users_show(struct device *dev, |
479 | struct device_attribute *attr, char *buf) |
480 | { |
481 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
482 | return sprintf(buf, "%d\n", rdev->use_count); |
483 | } |
484 | |
485 | static ssize_t regulator_type_show(struct device *dev, |
486 | struct device_attribute *attr, char *buf) |
487 | { |
488 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
489 | |
490 | switch (rdev->desc->type) { |
491 | case REGULATOR_VOLTAGE: |
492 | return sprintf(buf, "voltage\n"); |
493 | case REGULATOR_CURRENT: |
494 | return sprintf(buf, "current\n"); |
495 | } |
496 | return sprintf(buf, "unknown\n"); |
497 | } |
498 | |
499 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, |
500 | struct device_attribute *attr, char *buf) |
501 | { |
502 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
503 | |
504 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
505 | } |
506 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
507 | regulator_suspend_mem_uV_show, NULL); |
508 | |
509 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, |
510 | struct device_attribute *attr, char *buf) |
511 | { |
512 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
513 | |
514 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
515 | } |
516 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
517 | regulator_suspend_disk_uV_show, NULL); |
518 | |
519 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, |
520 | struct device_attribute *attr, char *buf) |
521 | { |
522 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
523 | |
524 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
525 | } |
526 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
527 | regulator_suspend_standby_uV_show, NULL); |
528 | |
529 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
530 | struct device_attribute *attr, char *buf) |
531 | { |
532 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
533 | |
534 | return regulator_print_opmode(buf, |
535 | rdev->constraints->state_mem.mode); |
536 | } |
537 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
538 | regulator_suspend_mem_mode_show, NULL); |
539 | |
540 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, |
541 | struct device_attribute *attr, char *buf) |
542 | { |
543 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
544 | |
545 | return regulator_print_opmode(buf, |
546 | rdev->constraints->state_disk.mode); |
547 | } |
548 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
549 | regulator_suspend_disk_mode_show, NULL); |
550 | |
551 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, |
552 | struct device_attribute *attr, char *buf) |
553 | { |
554 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
555 | |
556 | return regulator_print_opmode(buf, |
557 | rdev->constraints->state_standby.mode); |
558 | } |
559 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
560 | regulator_suspend_standby_mode_show, NULL); |
561 | |
562 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, |
563 | struct device_attribute *attr, char *buf) |
564 | { |
565 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
566 | |
567 | return regulator_print_state(buf, |
568 | rdev->constraints->state_mem.enabled); |
569 | } |
570 | static DEVICE_ATTR(suspend_mem_state, 0444, |
571 | regulator_suspend_mem_state_show, NULL); |
572 | |
573 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, |
574 | struct device_attribute *attr, char *buf) |
575 | { |
576 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
577 | |
578 | return regulator_print_state(buf, |
579 | rdev->constraints->state_disk.enabled); |
580 | } |
581 | static DEVICE_ATTR(suspend_disk_state, 0444, |
582 | regulator_suspend_disk_state_show, NULL); |
583 | |
584 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, |
585 | struct device_attribute *attr, char *buf) |
586 | { |
587 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
588 | |
589 | return regulator_print_state(buf, |
590 | rdev->constraints->state_standby.enabled); |
591 | } |
592 | static DEVICE_ATTR(suspend_standby_state, 0444, |
593 | regulator_suspend_standby_state_show, NULL); |
594 | |
595 | static ssize_t regulator_bypass_show(struct device *dev, |
596 | struct device_attribute *attr, char *buf) |
597 | { |
598 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
599 | const char *report; |
600 | bool bypass; |
601 | int ret; |
602 | |
603 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); |
604 | |
605 | if (ret != 0) |
606 | report = "unknown"; |
607 | else if (bypass) |
608 | report = "enabled"; |
609 | else |
610 | report = "disabled"; |
611 | |
612 | return sprintf(buf, "%s\n", report); |
613 | } |
614 | static DEVICE_ATTR(bypass, 0444, |
615 | regulator_bypass_show, NULL); |
616 | |
617 | /* |
618 | * These are the only attributes are present for all regulators. |
619 | * Other attributes are a function of regulator functionality. |
620 | */ |
621 | static struct device_attribute regulator_dev_attrs[] = { |
622 | __ATTR(name, 0444, regulator_name_show, NULL), |
623 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
624 | __ATTR(type, 0444, regulator_type_show, NULL), |
625 | __ATTR_NULL, |
626 | }; |
627 | |
628 | static void regulator_dev_release(struct device *dev) |
629 | { |
630 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
631 | kfree(rdev); |
632 | } |
633 | |
634 | static struct class regulator_class = { |
635 | .name = "regulator", |
636 | .dev_release = regulator_dev_release, |
637 | .dev_attrs = regulator_dev_attrs, |
638 | }; |
639 | |
640 | /* Calculate the new optimum regulator operating mode based on the new total |
641 | * consumer load. All locks held by caller */ |
642 | static void drms_uA_update(struct regulator_dev *rdev) |
643 | { |
644 | struct regulator *sibling; |
645 | int current_uA = 0, output_uV, input_uV, err; |
646 | unsigned int mode; |
647 | |
648 | err = regulator_check_drms(rdev); |
649 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || |
650 | (!rdev->desc->ops->get_voltage && |
651 | !rdev->desc->ops->get_voltage_sel) || |
652 | !rdev->desc->ops->set_mode) |
653 | return; |
654 | |
655 | /* get output voltage */ |
656 | output_uV = _regulator_get_voltage(rdev); |
657 | if (output_uV <= 0) |
658 | return; |
659 | |
660 | /* get input voltage */ |
661 | input_uV = 0; |
662 | if (rdev->supply) |
663 | input_uV = regulator_get_voltage(rdev->supply); |
664 | if (input_uV <= 0) |
665 | input_uV = rdev->constraints->input_uV; |
666 | if (input_uV <= 0) |
667 | return; |
668 | |
669 | /* calc total requested load */ |
670 | list_for_each_entry(sibling, &rdev->consumer_list, list) |
671 | current_uA += sibling->uA_load; |
672 | |
673 | /* now get the optimum mode for our new total regulator load */ |
674 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, |
675 | output_uV, current_uA); |
676 | |
677 | /* check the new mode is allowed */ |
678 | err = regulator_mode_constrain(rdev, &mode); |
679 | if (err == 0) |
680 | rdev->desc->ops->set_mode(rdev, mode); |
681 | } |
682 | |
683 | static int suspend_set_state(struct regulator_dev *rdev, |
684 | struct regulator_state *rstate) |
685 | { |
686 | int ret = 0; |
687 | |
688 | /* If we have no suspend mode configration don't set anything; |
689 | * only warn if the driver implements set_suspend_voltage or |
690 | * set_suspend_mode callback. |
691 | */ |
692 | if (!rstate->enabled && !rstate->disabled) { |
693 | if (rdev->desc->ops->set_suspend_voltage || |
694 | rdev->desc->ops->set_suspend_mode) |
695 | rdev_warn(rdev, "No configuration\n"); |
696 | return 0; |
697 | } |
698 | |
699 | if (rstate->enabled && rstate->disabled) { |
700 | rdev_err(rdev, "invalid configuration\n"); |
701 | return -EINVAL; |
702 | } |
703 | |
704 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
705 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
706 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
707 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
708 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
709 | ret = 0; |
710 | |
711 | if (ret < 0) { |
712 | rdev_err(rdev, "failed to enabled/disable\n"); |
713 | return ret; |
714 | } |
715 | |
716 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { |
717 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); |
718 | if (ret < 0) { |
719 | rdev_err(rdev, "failed to set voltage\n"); |
720 | return ret; |
721 | } |
722 | } |
723 | |
724 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { |
725 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); |
726 | if (ret < 0) { |
727 | rdev_err(rdev, "failed to set mode\n"); |
728 | return ret; |
729 | } |
730 | } |
731 | return ret; |
732 | } |
733 | |
734 | /* locks held by caller */ |
735 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) |
736 | { |
737 | if (!rdev->constraints) |
738 | return -EINVAL; |
739 | |
740 | switch (state) { |
741 | case PM_SUSPEND_STANDBY: |
742 | return suspend_set_state(rdev, |
743 | &rdev->constraints->state_standby); |
744 | case PM_SUSPEND_MEM: |
745 | return suspend_set_state(rdev, |
746 | &rdev->constraints->state_mem); |
747 | case PM_SUSPEND_MAX: |
748 | return suspend_set_state(rdev, |
749 | &rdev->constraints->state_disk); |
750 | default: |
751 | return -EINVAL; |
752 | } |
753 | } |
754 | |
755 | static void print_constraints(struct regulator_dev *rdev) |
756 | { |
757 | struct regulation_constraints *constraints = rdev->constraints; |
758 | char buf[80] = ""; |
759 | int count = 0; |
760 | int ret; |
761 | |
762 | if (constraints->min_uV && constraints->max_uV) { |
763 | if (constraints->min_uV == constraints->max_uV) |
764 | count += sprintf(buf + count, "%d mV ", |
765 | constraints->min_uV / 1000); |
766 | else |
767 | count += sprintf(buf + count, "%d <--> %d mV ", |
768 | constraints->min_uV / 1000, |
769 | constraints->max_uV / 1000); |
770 | } |
771 | |
772 | if (!constraints->min_uV || |
773 | constraints->min_uV != constraints->max_uV) { |
774 | ret = _regulator_get_voltage(rdev); |
775 | if (ret > 0) |
776 | count += sprintf(buf + count, "at %d mV ", ret / 1000); |
777 | } |
778 | |
779 | if (constraints->uV_offset) |
780 | count += sprintf(buf, "%dmV offset ", |
781 | constraints->uV_offset / 1000); |
782 | |
783 | if (constraints->min_uA && constraints->max_uA) { |
784 | if (constraints->min_uA == constraints->max_uA) |
785 | count += sprintf(buf + count, "%d mA ", |
786 | constraints->min_uA / 1000); |
787 | else |
788 | count += sprintf(buf + count, "%d <--> %d mA ", |
789 | constraints->min_uA / 1000, |
790 | constraints->max_uA / 1000); |
791 | } |
792 | |
793 | if (!constraints->min_uA || |
794 | constraints->min_uA != constraints->max_uA) { |
795 | ret = _regulator_get_current_limit(rdev); |
796 | if (ret > 0) |
797 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
798 | } |
799 | |
800 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
801 | count += sprintf(buf + count, "fast "); |
802 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
803 | count += sprintf(buf + count, "normal "); |
804 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
805 | count += sprintf(buf + count, "idle "); |
806 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
807 | count += sprintf(buf + count, "standby"); |
808 | |
809 | if (!count) |
810 | sprintf(buf, "no parameters"); |
811 | |
812 | rdev_info(rdev, "%s\n", buf); |
813 | |
814 | if ((constraints->min_uV != constraints->max_uV) && |
815 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) |
816 | rdev_warn(rdev, |
817 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); |
818 | } |
819 | |
820 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
821 | struct regulation_constraints *constraints) |
822 | { |
823 | struct regulator_ops *ops = rdev->desc->ops; |
824 | int ret; |
825 | |
826 | /* do we need to apply the constraint voltage */ |
827 | if (rdev->constraints->apply_uV && |
828 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
829 | ret = _regulator_do_set_voltage(rdev, |
830 | rdev->constraints->min_uV, |
831 | rdev->constraints->max_uV); |
832 | if (ret < 0) { |
833 | rdev_err(rdev, "failed to apply %duV constraint\n", |
834 | rdev->constraints->min_uV); |
835 | return ret; |
836 | } |
837 | } |
838 | |
839 | /* constrain machine-level voltage specs to fit |
840 | * the actual range supported by this regulator. |
841 | */ |
842 | if (ops->list_voltage && rdev->desc->n_voltages) { |
843 | int count = rdev->desc->n_voltages; |
844 | int i; |
845 | int min_uV = INT_MAX; |
846 | int max_uV = INT_MIN; |
847 | int cmin = constraints->min_uV; |
848 | int cmax = constraints->max_uV; |
849 | |
850 | /* it's safe to autoconfigure fixed-voltage supplies |
851 | and the constraints are used by list_voltage. */ |
852 | if (count == 1 && !cmin) { |
853 | cmin = 1; |
854 | cmax = INT_MAX; |
855 | constraints->min_uV = cmin; |
856 | constraints->max_uV = cmax; |
857 | } |
858 | |
859 | /* voltage constraints are optional */ |
860 | if ((cmin == 0) && (cmax == 0)) |
861 | return 0; |
862 | |
863 | /* else require explicit machine-level constraints */ |
864 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
865 | rdev_err(rdev, "invalid voltage constraints\n"); |
866 | return -EINVAL; |
867 | } |
868 | |
869 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
870 | for (i = 0; i < count; i++) { |
871 | int value; |
872 | |
873 | value = ops->list_voltage(rdev, i); |
874 | if (value <= 0) |
875 | continue; |
876 | |
877 | /* maybe adjust [min_uV..max_uV] */ |
878 | if (value >= cmin && value < min_uV) |
879 | min_uV = value; |
880 | if (value <= cmax && value > max_uV) |
881 | max_uV = value; |
882 | } |
883 | |
884 | /* final: [min_uV..max_uV] valid iff constraints valid */ |
885 | if (max_uV < min_uV) { |
886 | rdev_err(rdev, |
887 | "unsupportable voltage constraints %u-%uuV\n", |
888 | min_uV, max_uV); |
889 | return -EINVAL; |
890 | } |
891 | |
892 | /* use regulator's subset of machine constraints */ |
893 | if (constraints->min_uV < min_uV) { |
894 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
895 | constraints->min_uV, min_uV); |
896 | constraints->min_uV = min_uV; |
897 | } |
898 | if (constraints->max_uV > max_uV) { |
899 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
900 | constraints->max_uV, max_uV); |
901 | constraints->max_uV = max_uV; |
902 | } |
903 | } |
904 | |
905 | return 0; |
906 | } |
907 | |
908 | /** |
909 | * set_machine_constraints - sets regulator constraints |
910 | * @rdev: regulator source |
911 | * @constraints: constraints to apply |
912 | * |
913 | * Allows platform initialisation code to define and constrain |
914 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: |
915 | * Constraints *must* be set by platform code in order for some |
916 | * regulator operations to proceed i.e. set_voltage, set_current_limit, |
917 | * set_mode. |
918 | */ |
919 | static int set_machine_constraints(struct regulator_dev *rdev, |
920 | const struct regulation_constraints *constraints) |
921 | { |
922 | int ret = 0; |
923 | struct regulator_ops *ops = rdev->desc->ops; |
924 | |
925 | if (constraints) |
926 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
927 | GFP_KERNEL); |
928 | else |
929 | rdev->constraints = kzalloc(sizeof(*constraints), |
930 | GFP_KERNEL); |
931 | if (!rdev->constraints) |
932 | return -ENOMEM; |
933 | |
934 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
935 | if (ret != 0) |
936 | goto out; |
937 | |
938 | /* do we need to setup our suspend state */ |
939 | if (rdev->constraints->initial_state) { |
940 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
941 | if (ret < 0) { |
942 | rdev_err(rdev, "failed to set suspend state\n"); |
943 | goto out; |
944 | } |
945 | } |
946 | |
947 | if (rdev->constraints->initial_mode) { |
948 | if (!ops->set_mode) { |
949 | rdev_err(rdev, "no set_mode operation\n"); |
950 | ret = -EINVAL; |
951 | goto out; |
952 | } |
953 | |
954 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
955 | if (ret < 0) { |
956 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
957 | goto out; |
958 | } |
959 | } |
960 | |
961 | /* If the constraints say the regulator should be on at this point |
962 | * and we have control then make sure it is enabled. |
963 | */ |
964 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
965 | ops->enable) { |
966 | ret = ops->enable(rdev); |
967 | if (ret < 0) { |
968 | rdev_err(rdev, "failed to enable\n"); |
969 | goto out; |
970 | } |
971 | } |
972 | |
973 | if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { |
974 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
975 | if (ret < 0) { |
976 | rdev_err(rdev, "failed to set ramp_delay\n"); |
977 | goto out; |
978 | } |
979 | } |
980 | |
981 | print_constraints(rdev); |
982 | return 0; |
983 | out: |
984 | kfree(rdev->constraints); |
985 | rdev->constraints = NULL; |
986 | return ret; |
987 | } |
988 | |
989 | /** |
990 | * set_supply - set regulator supply regulator |
991 | * @rdev: regulator name |
992 | * @supply_rdev: supply regulator name |
993 | * |
994 | * Called by platform initialisation code to set the supply regulator for this |
995 | * regulator. This ensures that a regulators supply will also be enabled by the |
996 | * core if it's child is enabled. |
997 | */ |
998 | static int set_supply(struct regulator_dev *rdev, |
999 | struct regulator_dev *supply_rdev) |
1000 | { |
1001 | int err; |
1002 | |
1003 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1004 | |
1005 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
1006 | if (rdev->supply == NULL) { |
1007 | err = -ENOMEM; |
1008 | return err; |
1009 | } |
1010 | supply_rdev->open_count++; |
1011 | |
1012 | return 0; |
1013 | } |
1014 | |
1015 | /** |
1016 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
1017 | * @rdev: regulator source |
1018 | * @consumer_dev_name: dev_name() string for device supply applies to |
1019 | * @supply: symbolic name for supply |
1020 | * |
1021 | * Allows platform initialisation code to map physical regulator |
1022 | * sources to symbolic names for supplies for use by devices. Devices |
1023 | * should use these symbolic names to request regulators, avoiding the |
1024 | * need to provide board-specific regulator names as platform data. |
1025 | */ |
1026 | static int set_consumer_device_supply(struct regulator_dev *rdev, |
1027 | const char *consumer_dev_name, |
1028 | const char *supply) |
1029 | { |
1030 | struct regulator_map *node; |
1031 | int has_dev; |
1032 | |
1033 | if (supply == NULL) |
1034 | return -EINVAL; |
1035 | |
1036 | if (consumer_dev_name != NULL) |
1037 | has_dev = 1; |
1038 | else |
1039 | has_dev = 0; |
1040 | |
1041 | list_for_each_entry(node, ®ulator_map_list, list) { |
1042 | if (node->dev_name && consumer_dev_name) { |
1043 | if (strcmp(node->dev_name, consumer_dev_name) != 0) |
1044 | continue; |
1045 | } else if (node->dev_name || consumer_dev_name) { |
1046 | continue; |
1047 | } |
1048 | |
1049 | if (strcmp(node->supply, supply) != 0) |
1050 | continue; |
1051 | |
1052 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1053 | consumer_dev_name, |
1054 | dev_name(&node->regulator->dev), |
1055 | node->regulator->desc->name, |
1056 | supply, |
1057 | dev_name(&rdev->dev), rdev_get_name(rdev)); |
1058 | return -EBUSY; |
1059 | } |
1060 | |
1061 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1062 | if (node == NULL) |
1063 | return -ENOMEM; |
1064 | |
1065 | node->regulator = rdev; |
1066 | node->supply = supply; |
1067 | |
1068 | if (has_dev) { |
1069 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); |
1070 | if (node->dev_name == NULL) { |
1071 | kfree(node); |
1072 | return -ENOMEM; |
1073 | } |
1074 | } |
1075 | |
1076 | list_add(&node->list, ®ulator_map_list); |
1077 | return 0; |
1078 | } |
1079 | |
1080 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1081 | { |
1082 | struct regulator_map *node, *n; |
1083 | |
1084 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { |
1085 | if (rdev == node->regulator) { |
1086 | list_del(&node->list); |
1087 | kfree(node->dev_name); |
1088 | kfree(node); |
1089 | } |
1090 | } |
1091 | } |
1092 | |
1093 | #define REG_STR_SIZE 64 |
1094 | |
1095 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
1096 | struct device *dev, |
1097 | const char *supply_name) |
1098 | { |
1099 | struct regulator *regulator; |
1100 | char buf[REG_STR_SIZE]; |
1101 | int err, size; |
1102 | |
1103 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); |
1104 | if (regulator == NULL) |
1105 | return NULL; |
1106 | |
1107 | mutex_lock(&rdev->mutex); |
1108 | regulator->rdev = rdev; |
1109 | list_add(®ulator->list, &rdev->consumer_list); |
1110 | |
1111 | if (dev) { |
1112 | regulator->dev = dev; |
1113 | |
1114 | /* Add a link to the device sysfs entry */ |
1115 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1116 | dev->kobj.name, supply_name); |
1117 | if (size >= REG_STR_SIZE) |
1118 | goto overflow_err; |
1119 | |
1120 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); |
1121 | if (regulator->supply_name == NULL) |
1122 | goto overflow_err; |
1123 | |
1124 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, |
1125 | buf); |
1126 | if (err) { |
1127 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1128 | dev->kobj.name, err); |
1129 | /* non-fatal */ |
1130 | } |
1131 | } else { |
1132 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); |
1133 | if (regulator->supply_name == NULL) |
1134 | goto overflow_err; |
1135 | } |
1136 | |
1137 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1138 | rdev->debugfs); |
1139 | if (!regulator->debugfs) { |
1140 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1141 | } else { |
1142 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, |
1143 | ®ulator->uA_load); |
1144 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, |
1145 | ®ulator->min_uV); |
1146 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
1147 | ®ulator->max_uV); |
1148 | } |
1149 | |
1150 | /* |
1151 | * Check now if the regulator is an always on regulator - if |
1152 | * it is then we don't need to do nearly so much work for |
1153 | * enable/disable calls. |
1154 | */ |
1155 | if (!_regulator_can_change_status(rdev) && |
1156 | _regulator_is_enabled(rdev)) |
1157 | regulator->always_on = true; |
1158 | |
1159 | mutex_unlock(&rdev->mutex); |
1160 | return regulator; |
1161 | overflow_err: |
1162 | list_del(®ulator->list); |
1163 | kfree(regulator); |
1164 | mutex_unlock(&rdev->mutex); |
1165 | return NULL; |
1166 | } |
1167 | |
1168 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1169 | { |
1170 | if (!rdev->desc->ops->enable_time) |
1171 | return rdev->desc->enable_time; |
1172 | return rdev->desc->ops->enable_time(rdev); |
1173 | } |
1174 | |
1175 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
1176 | const char *supply, |
1177 | int *ret) |
1178 | { |
1179 | struct regulator_dev *r; |
1180 | struct device_node *node; |
1181 | struct regulator_map *map; |
1182 | const char *devname = NULL; |
1183 | |
1184 | /* first do a dt based lookup */ |
1185 | if (dev && dev->of_node) { |
1186 | node = of_get_regulator(dev, supply); |
1187 | if (node) { |
1188 | list_for_each_entry(r, ®ulator_list, list) |
1189 | if (r->dev.parent && |
1190 | node == r->dev.of_node) |
1191 | return r; |
1192 | } else { |
1193 | /* |
1194 | * If we couldn't even get the node then it's |
1195 | * not just that the device didn't register |
1196 | * yet, there's no node and we'll never |
1197 | * succeed. |
1198 | */ |
1199 | *ret = -ENODEV; |
1200 | } |
1201 | } |
1202 | |
1203 | /* if not found, try doing it non-dt way */ |
1204 | if (dev) |
1205 | devname = dev_name(dev); |
1206 | |
1207 | list_for_each_entry(r, ®ulator_list, list) |
1208 | if (strcmp(rdev_get_name(r), supply) == 0) |
1209 | return r; |
1210 | |
1211 | list_for_each_entry(map, ®ulator_map_list, list) { |
1212 | /* If the mapping has a device set up it must match */ |
1213 | if (map->dev_name && |
1214 | (!devname || strcmp(map->dev_name, devname))) |
1215 | continue; |
1216 | |
1217 | if (strcmp(map->supply, supply) == 0) |
1218 | return map->regulator; |
1219 | } |
1220 | |
1221 | |
1222 | return NULL; |
1223 | } |
1224 | |
1225 | /* Internal regulator request function */ |
1226 | static struct regulator *_regulator_get(struct device *dev, const char *id, |
1227 | int exclusive) |
1228 | { |
1229 | struct regulator_dev *rdev; |
1230 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
1231 | const char *devname = NULL; |
1232 | int ret; |
1233 | |
1234 | if (id == NULL) { |
1235 | pr_err("get() with no identifier\n"); |
1236 | return regulator; |
1237 | } |
1238 | |
1239 | if (dev) |
1240 | devname = dev_name(dev); |
1241 | |
1242 | mutex_lock(®ulator_list_mutex); |
1243 | |
1244 | rdev = regulator_dev_lookup(dev, id, &ret); |
1245 | if (rdev) |
1246 | goto found; |
1247 | |
1248 | if (board_wants_dummy_regulator) { |
1249 | rdev = dummy_regulator_rdev; |
1250 | goto found; |
1251 | } |
1252 | |
1253 | #ifdef CONFIG_REGULATOR_DUMMY |
1254 | if (!devname) |
1255 | devname = "deviceless"; |
1256 | |
1257 | /* If the board didn't flag that it was fully constrained then |
1258 | * substitute in a dummy regulator so consumers can continue. |
1259 | */ |
1260 | if (!has_full_constraints) { |
1261 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1262 | devname, id); |
1263 | rdev = dummy_regulator_rdev; |
1264 | goto found; |
1265 | } |
1266 | #endif |
1267 | |
1268 | mutex_unlock(®ulator_list_mutex); |
1269 | return regulator; |
1270 | |
1271 | found: |
1272 | if (rdev->exclusive) { |
1273 | regulator = ERR_PTR(-EPERM); |
1274 | goto out; |
1275 | } |
1276 | |
1277 | if (exclusive && rdev->open_count) { |
1278 | regulator = ERR_PTR(-EBUSY); |
1279 | goto out; |
1280 | } |
1281 | |
1282 | if (!try_module_get(rdev->owner)) |
1283 | goto out; |
1284 | |
1285 | regulator = create_regulator(rdev, dev, id); |
1286 | if (regulator == NULL) { |
1287 | regulator = ERR_PTR(-ENOMEM); |
1288 | module_put(rdev->owner); |
1289 | goto out; |
1290 | } |
1291 | |
1292 | rdev->open_count++; |
1293 | if (exclusive) { |
1294 | rdev->exclusive = 1; |
1295 | |
1296 | ret = _regulator_is_enabled(rdev); |
1297 | if (ret > 0) |
1298 | rdev->use_count = 1; |
1299 | else |
1300 | rdev->use_count = 0; |
1301 | } |
1302 | |
1303 | out: |
1304 | mutex_unlock(®ulator_list_mutex); |
1305 | |
1306 | return regulator; |
1307 | } |
1308 | |
1309 | /** |
1310 | * regulator_get - lookup and obtain a reference to a regulator. |
1311 | * @dev: device for regulator "consumer" |
1312 | * @id: Supply name or regulator ID. |
1313 | * |
1314 | * Returns a struct regulator corresponding to the regulator producer, |
1315 | * or IS_ERR() condition containing errno. |
1316 | * |
1317 | * Use of supply names configured via regulator_set_device_supply() is |
1318 | * strongly encouraged. It is recommended that the supply name used |
1319 | * should match the name used for the supply and/or the relevant |
1320 | * device pins in the datasheet. |
1321 | */ |
1322 | struct regulator *regulator_get(struct device *dev, const char *id) |
1323 | { |
1324 | return _regulator_get(dev, id, 0); |
1325 | } |
1326 | EXPORT_SYMBOL_GPL(regulator_get); |
1327 | |
1328 | static void devm_regulator_release(struct device *dev, void *res) |
1329 | { |
1330 | regulator_put(*(struct regulator **)res); |
1331 | } |
1332 | |
1333 | /** |
1334 | * devm_regulator_get - Resource managed regulator_get() |
1335 | * @dev: device for regulator "consumer" |
1336 | * @id: Supply name or regulator ID. |
1337 | * |
1338 | * Managed regulator_get(). Regulators returned from this function are |
1339 | * automatically regulator_put() on driver detach. See regulator_get() for more |
1340 | * information. |
1341 | */ |
1342 | struct regulator *devm_regulator_get(struct device *dev, const char *id) |
1343 | { |
1344 | struct regulator **ptr, *regulator; |
1345 | |
1346 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); |
1347 | if (!ptr) |
1348 | return ERR_PTR(-ENOMEM); |
1349 | |
1350 | regulator = regulator_get(dev, id); |
1351 | if (!IS_ERR(regulator)) { |
1352 | *ptr = regulator; |
1353 | devres_add(dev, ptr); |
1354 | } else { |
1355 | devres_free(ptr); |
1356 | } |
1357 | |
1358 | return regulator; |
1359 | } |
1360 | EXPORT_SYMBOL_GPL(devm_regulator_get); |
1361 | |
1362 | /** |
1363 | * regulator_get_exclusive - obtain exclusive access to a regulator. |
1364 | * @dev: device for regulator "consumer" |
1365 | * @id: Supply name or regulator ID. |
1366 | * |
1367 | * Returns a struct regulator corresponding to the regulator producer, |
1368 | * or IS_ERR() condition containing errno. Other consumers will be |
1369 | * unable to obtain this reference is held and the use count for the |
1370 | * regulator will be initialised to reflect the current state of the |
1371 | * regulator. |
1372 | * |
1373 | * This is intended for use by consumers which cannot tolerate shared |
1374 | * use of the regulator such as those which need to force the |
1375 | * regulator off for correct operation of the hardware they are |
1376 | * controlling. |
1377 | * |
1378 | * Use of supply names configured via regulator_set_device_supply() is |
1379 | * strongly encouraged. It is recommended that the supply name used |
1380 | * should match the name used for the supply and/or the relevant |
1381 | * device pins in the datasheet. |
1382 | */ |
1383 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) |
1384 | { |
1385 | return _regulator_get(dev, id, 1); |
1386 | } |
1387 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); |
1388 | |
1389 | /* Locks held by regulator_put() */ |
1390 | static void _regulator_put(struct regulator *regulator) |
1391 | { |
1392 | struct regulator_dev *rdev; |
1393 | |
1394 | if (regulator == NULL || IS_ERR(regulator)) |
1395 | return; |
1396 | |
1397 | rdev = regulator->rdev; |
1398 | |
1399 | debugfs_remove_recursive(regulator->debugfs); |
1400 | |
1401 | /* remove any sysfs entries */ |
1402 | if (regulator->dev) |
1403 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
1404 | kfree(regulator->supply_name); |
1405 | list_del(®ulator->list); |
1406 | kfree(regulator); |
1407 | |
1408 | rdev->open_count--; |
1409 | rdev->exclusive = 0; |
1410 | |
1411 | module_put(rdev->owner); |
1412 | } |
1413 | |
1414 | /** |
1415 | * regulator_put - "free" the regulator source |
1416 | * @regulator: regulator source |
1417 | * |
1418 | * Note: drivers must ensure that all regulator_enable calls made on this |
1419 | * regulator source are balanced by regulator_disable calls prior to calling |
1420 | * this function. |
1421 | */ |
1422 | void regulator_put(struct regulator *regulator) |
1423 | { |
1424 | mutex_lock(®ulator_list_mutex); |
1425 | _regulator_put(regulator); |
1426 | mutex_unlock(®ulator_list_mutex); |
1427 | } |
1428 | EXPORT_SYMBOL_GPL(regulator_put); |
1429 | |
1430 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1431 | { |
1432 | struct regulator **r = res; |
1433 | if (!r || !*r) { |
1434 | WARN_ON(!r || !*r); |
1435 | return 0; |
1436 | } |
1437 | return *r == data; |
1438 | } |
1439 | |
1440 | /** |
1441 | * devm_regulator_put - Resource managed regulator_put() |
1442 | * @regulator: regulator to free |
1443 | * |
1444 | * Deallocate a regulator allocated with devm_regulator_get(). Normally |
1445 | * this function will not need to be called and the resource management |
1446 | * code will ensure that the resource is freed. |
1447 | */ |
1448 | void devm_regulator_put(struct regulator *regulator) |
1449 | { |
1450 | int rc; |
1451 | |
1452 | rc = devres_release(regulator->dev, devm_regulator_release, |
1453 | devm_regulator_match, regulator); |
1454 | if (rc != 0) |
1455 | WARN_ON(rc); |
1456 | } |
1457 | EXPORT_SYMBOL_GPL(devm_regulator_put); |
1458 | |
1459 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1460 | { |
1461 | int ret, delay; |
1462 | |
1463 | /* Query before enabling in case configuration dependent. */ |
1464 | ret = _regulator_get_enable_time(rdev); |
1465 | if (ret >= 0) { |
1466 | delay = ret; |
1467 | } else { |
1468 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); |
1469 | delay = 0; |
1470 | } |
1471 | |
1472 | trace_regulator_enable(rdev_get_name(rdev)); |
1473 | |
1474 | if (rdev->ena_gpio) { |
1475 | gpio_set_value_cansleep(rdev->ena_gpio, |
1476 | !rdev->ena_gpio_invert); |
1477 | rdev->ena_gpio_state = 1; |
1478 | } else if (rdev->desc->ops->enable) { |
1479 | ret = rdev->desc->ops->enable(rdev); |
1480 | if (ret < 0) |
1481 | return ret; |
1482 | } else { |
1483 | return -EINVAL; |
1484 | } |
1485 | |
1486 | /* Allow the regulator to ramp; it would be useful to extend |
1487 | * this for bulk operations so that the regulators can ramp |
1488 | * together. */ |
1489 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1490 | |
1491 | if (delay >= 1000) { |
1492 | mdelay(delay / 1000); |
1493 | udelay(delay % 1000); |
1494 | } else if (delay) { |
1495 | udelay(delay); |
1496 | } |
1497 | |
1498 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1499 | |
1500 | return 0; |
1501 | } |
1502 | |
1503 | /* locks held by regulator_enable() */ |
1504 | static int _regulator_enable(struct regulator_dev *rdev) |
1505 | { |
1506 | int ret; |
1507 | |
1508 | /* check voltage and requested load before enabling */ |
1509 | if (rdev->constraints && |
1510 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) |
1511 | drms_uA_update(rdev); |
1512 | |
1513 | if (rdev->use_count == 0) { |
1514 | /* The regulator may on if it's not switchable or left on */ |
1515 | ret = _regulator_is_enabled(rdev); |
1516 | if (ret == -EINVAL || ret == 0) { |
1517 | if (!_regulator_can_change_status(rdev)) |
1518 | return -EPERM; |
1519 | |
1520 | ret = _regulator_do_enable(rdev); |
1521 | if (ret < 0) |
1522 | return ret; |
1523 | |
1524 | } else if (ret < 0) { |
1525 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
1526 | return ret; |
1527 | } |
1528 | /* Fallthrough on positive return values - already enabled */ |
1529 | } |
1530 | |
1531 | rdev->use_count++; |
1532 | |
1533 | return 0; |
1534 | } |
1535 | |
1536 | /** |
1537 | * regulator_enable - enable regulator output |
1538 | * @regulator: regulator source |
1539 | * |
1540 | * Request that the regulator be enabled with the regulator output at |
1541 | * the predefined voltage or current value. Calls to regulator_enable() |
1542 | * must be balanced with calls to regulator_disable(). |
1543 | * |
1544 | * NOTE: the output value can be set by other drivers, boot loader or may be |
1545 | * hardwired in the regulator. |
1546 | */ |
1547 | int regulator_enable(struct regulator *regulator) |
1548 | { |
1549 | struct regulator_dev *rdev = regulator->rdev; |
1550 | int ret = 0; |
1551 | |
1552 | if (regulator->always_on) |
1553 | return 0; |
1554 | |
1555 | if (rdev->supply) { |
1556 | ret = regulator_enable(rdev->supply); |
1557 | if (ret != 0) |
1558 | return ret; |
1559 | } |
1560 | |
1561 | mutex_lock(&rdev->mutex); |
1562 | ret = _regulator_enable(rdev); |
1563 | mutex_unlock(&rdev->mutex); |
1564 | |
1565 | if (ret != 0 && rdev->supply) |
1566 | regulator_disable(rdev->supply); |
1567 | |
1568 | return ret; |
1569 | } |
1570 | EXPORT_SYMBOL_GPL(regulator_enable); |
1571 | |
1572 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1573 | { |
1574 | int ret; |
1575 | |
1576 | trace_regulator_disable(rdev_get_name(rdev)); |
1577 | |
1578 | if (rdev->ena_gpio) { |
1579 | gpio_set_value_cansleep(rdev->ena_gpio, |
1580 | rdev->ena_gpio_invert); |
1581 | rdev->ena_gpio_state = 0; |
1582 | |
1583 | } else if (rdev->desc->ops->disable) { |
1584 | ret = rdev->desc->ops->disable(rdev); |
1585 | if (ret != 0) |
1586 | return ret; |
1587 | } |
1588 | |
1589 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1590 | |
1591 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1592 | NULL); |
1593 | return 0; |
1594 | } |
1595 | |
1596 | /* locks held by regulator_disable() */ |
1597 | static int _regulator_disable(struct regulator_dev *rdev) |
1598 | { |
1599 | int ret = 0; |
1600 | |
1601 | if (WARN(rdev->use_count <= 0, |
1602 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
1603 | return -EIO; |
1604 | |
1605 | /* are we the last user and permitted to disable ? */ |
1606 | if (rdev->use_count == 1 && |
1607 | (rdev->constraints && !rdev->constraints->always_on)) { |
1608 | |
1609 | /* we are last user */ |
1610 | if (_regulator_can_change_status(rdev)) { |
1611 | ret = _regulator_do_disable(rdev); |
1612 | if (ret < 0) { |
1613 | rdev_err(rdev, "failed to disable\n"); |
1614 | return ret; |
1615 | } |
1616 | } |
1617 | |
1618 | rdev->use_count = 0; |
1619 | } else if (rdev->use_count > 1) { |
1620 | |
1621 | if (rdev->constraints && |
1622 | (rdev->constraints->valid_ops_mask & |
1623 | REGULATOR_CHANGE_DRMS)) |
1624 | drms_uA_update(rdev); |
1625 | |
1626 | rdev->use_count--; |
1627 | } |
1628 | |
1629 | return ret; |
1630 | } |
1631 | |
1632 | /** |
1633 | * regulator_disable - disable regulator output |
1634 | * @regulator: regulator source |
1635 | * |
1636 | * Disable the regulator output voltage or current. Calls to |
1637 | * regulator_enable() must be balanced with calls to |
1638 | * regulator_disable(). |
1639 | * |
1640 | * NOTE: this will only disable the regulator output if no other consumer |
1641 | * devices have it enabled, the regulator device supports disabling and |
1642 | * machine constraints permit this operation. |
1643 | */ |
1644 | int regulator_disable(struct regulator *regulator) |
1645 | { |
1646 | struct regulator_dev *rdev = regulator->rdev; |
1647 | int ret = 0; |
1648 | |
1649 | if (regulator->always_on) |
1650 | return 0; |
1651 | |
1652 | mutex_lock(&rdev->mutex); |
1653 | ret = _regulator_disable(rdev); |
1654 | mutex_unlock(&rdev->mutex); |
1655 | |
1656 | if (ret == 0 && rdev->supply) |
1657 | regulator_disable(rdev->supply); |
1658 | |
1659 | return ret; |
1660 | } |
1661 | EXPORT_SYMBOL_GPL(regulator_disable); |
1662 | |
1663 | /* locks held by regulator_force_disable() */ |
1664 | static int _regulator_force_disable(struct regulator_dev *rdev) |
1665 | { |
1666 | int ret = 0; |
1667 | |
1668 | /* force disable */ |
1669 | if (rdev->desc->ops->disable) { |
1670 | /* ah well, who wants to live forever... */ |
1671 | ret = rdev->desc->ops->disable(rdev); |
1672 | if (ret < 0) { |
1673 | rdev_err(rdev, "failed to force disable\n"); |
1674 | return ret; |
1675 | } |
1676 | /* notify other consumers that power has been forced off */ |
1677 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1678 | REGULATOR_EVENT_DISABLE, NULL); |
1679 | } |
1680 | |
1681 | return ret; |
1682 | } |
1683 | |
1684 | /** |
1685 | * regulator_force_disable - force disable regulator output |
1686 | * @regulator: regulator source |
1687 | * |
1688 | * Forcibly disable the regulator output voltage or current. |
1689 | * NOTE: this *will* disable the regulator output even if other consumer |
1690 | * devices have it enabled. This should be used for situations when device |
1691 | * damage will likely occur if the regulator is not disabled (e.g. over temp). |
1692 | */ |
1693 | int regulator_force_disable(struct regulator *regulator) |
1694 | { |
1695 | struct regulator_dev *rdev = regulator->rdev; |
1696 | int ret; |
1697 | |
1698 | mutex_lock(&rdev->mutex); |
1699 | regulator->uA_load = 0; |
1700 | ret = _regulator_force_disable(regulator->rdev); |
1701 | mutex_unlock(&rdev->mutex); |
1702 | |
1703 | if (rdev->supply) |
1704 | while (rdev->open_count--) |
1705 | regulator_disable(rdev->supply); |
1706 | |
1707 | return ret; |
1708 | } |
1709 | EXPORT_SYMBOL_GPL(regulator_force_disable); |
1710 | |
1711 | static void regulator_disable_work(struct work_struct *work) |
1712 | { |
1713 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, |
1714 | disable_work.work); |
1715 | int count, i, ret; |
1716 | |
1717 | mutex_lock(&rdev->mutex); |
1718 | |
1719 | BUG_ON(!rdev->deferred_disables); |
1720 | |
1721 | count = rdev->deferred_disables; |
1722 | rdev->deferred_disables = 0; |
1723 | |
1724 | for (i = 0; i < count; i++) { |
1725 | ret = _regulator_disable(rdev); |
1726 | if (ret != 0) |
1727 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); |
1728 | } |
1729 | |
1730 | mutex_unlock(&rdev->mutex); |
1731 | |
1732 | if (rdev->supply) { |
1733 | for (i = 0; i < count; i++) { |
1734 | ret = regulator_disable(rdev->supply); |
1735 | if (ret != 0) { |
1736 | rdev_err(rdev, |
1737 | "Supply disable failed: %d\n", ret); |
1738 | } |
1739 | } |
1740 | } |
1741 | } |
1742 | |
1743 | /** |
1744 | * regulator_disable_deferred - disable regulator output with delay |
1745 | * @regulator: regulator source |
1746 | * @ms: miliseconds until the regulator is disabled |
1747 | * |
1748 | * Execute regulator_disable() on the regulator after a delay. This |
1749 | * is intended for use with devices that require some time to quiesce. |
1750 | * |
1751 | * NOTE: this will only disable the regulator output if no other consumer |
1752 | * devices have it enabled, the regulator device supports disabling and |
1753 | * machine constraints permit this operation. |
1754 | */ |
1755 | int regulator_disable_deferred(struct regulator *regulator, int ms) |
1756 | { |
1757 | struct regulator_dev *rdev = regulator->rdev; |
1758 | int ret; |
1759 | |
1760 | if (regulator->always_on) |
1761 | return 0; |
1762 | |
1763 | if (!ms) |
1764 | return regulator_disable(regulator); |
1765 | |
1766 | mutex_lock(&rdev->mutex); |
1767 | rdev->deferred_disables++; |
1768 | mutex_unlock(&rdev->mutex); |
1769 | |
1770 | ret = schedule_delayed_work(&rdev->disable_work, |
1771 | msecs_to_jiffies(ms)); |
1772 | if (ret < 0) |
1773 | return ret; |
1774 | else |
1775 | return 0; |
1776 | } |
1777 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); |
1778 | |
1779 | /** |
1780 | * regulator_is_enabled_regmap - standard is_enabled() for regmap users |
1781 | * |
1782 | * @rdev: regulator to operate on |
1783 | * |
1784 | * Regulators that use regmap for their register I/O can set the |
1785 | * enable_reg and enable_mask fields in their descriptor and then use |
1786 | * this as their is_enabled operation, saving some code. |
1787 | */ |
1788 | int regulator_is_enabled_regmap(struct regulator_dev *rdev) |
1789 | { |
1790 | unsigned int val; |
1791 | int ret; |
1792 | |
1793 | ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); |
1794 | if (ret != 0) |
1795 | return ret; |
1796 | |
1797 | return (val & rdev->desc->enable_mask) != 0; |
1798 | } |
1799 | EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); |
1800 | |
1801 | /** |
1802 | * regulator_enable_regmap - standard enable() for regmap users |
1803 | * |
1804 | * @rdev: regulator to operate on |
1805 | * |
1806 | * Regulators that use regmap for their register I/O can set the |
1807 | * enable_reg and enable_mask fields in their descriptor and then use |
1808 | * this as their enable() operation, saving some code. |
1809 | */ |
1810 | int regulator_enable_regmap(struct regulator_dev *rdev) |
1811 | { |
1812 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
1813 | rdev->desc->enable_mask, |
1814 | rdev->desc->enable_mask); |
1815 | } |
1816 | EXPORT_SYMBOL_GPL(regulator_enable_regmap); |
1817 | |
1818 | /** |
1819 | * regulator_disable_regmap - standard disable() for regmap users |
1820 | * |
1821 | * @rdev: regulator to operate on |
1822 | * |
1823 | * Regulators that use regmap for their register I/O can set the |
1824 | * enable_reg and enable_mask fields in their descriptor and then use |
1825 | * this as their disable() operation, saving some code. |
1826 | */ |
1827 | int regulator_disable_regmap(struct regulator_dev *rdev) |
1828 | { |
1829 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
1830 | rdev->desc->enable_mask, 0); |
1831 | } |
1832 | EXPORT_SYMBOL_GPL(regulator_disable_regmap); |
1833 | |
1834 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1835 | { |
1836 | /* A GPIO control always takes precedence */ |
1837 | if (rdev->ena_gpio) |
1838 | return rdev->ena_gpio_state; |
1839 | |
1840 | /* If we don't know then assume that the regulator is always on */ |
1841 | if (!rdev->desc->ops->is_enabled) |
1842 | return 1; |
1843 | |
1844 | return rdev->desc->ops->is_enabled(rdev); |
1845 | } |
1846 | |
1847 | /** |
1848 | * regulator_is_enabled - is the regulator output enabled |
1849 | * @regulator: regulator source |
1850 | * |
1851 | * Returns positive if the regulator driver backing the source/client |
1852 | * has requested that the device be enabled, zero if it hasn't, else a |
1853 | * negative errno code. |
1854 | * |
1855 | * Note that the device backing this regulator handle can have multiple |
1856 | * users, so it might be enabled even if regulator_enable() was never |
1857 | * called for this particular source. |
1858 | */ |
1859 | int regulator_is_enabled(struct regulator *regulator) |
1860 | { |
1861 | int ret; |
1862 | |
1863 | if (regulator->always_on) |
1864 | return 1; |
1865 | |
1866 | mutex_lock(®ulator->rdev->mutex); |
1867 | ret = _regulator_is_enabled(regulator->rdev); |
1868 | mutex_unlock(®ulator->rdev->mutex); |
1869 | |
1870 | return ret; |
1871 | } |
1872 | EXPORT_SYMBOL_GPL(regulator_is_enabled); |
1873 | |
1874 | /** |
1875 | * regulator_can_change_voltage - check if regulator can change voltage |
1876 | * @regulator: regulator source |
1877 | * |
1878 | * Returns positive if the regulator driver backing the source/client |
1879 | * can change its voltage, false otherwise. Usefull for detecting fixed |
1880 | * or dummy regulators and disabling voltage change logic in the client |
1881 | * driver. |
1882 | */ |
1883 | int regulator_can_change_voltage(struct regulator *regulator) |
1884 | { |
1885 | struct regulator_dev *rdev = regulator->rdev; |
1886 | |
1887 | if (rdev->constraints && |
1888 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
1889 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) |
1890 | return 1; |
1891 | |
1892 | if (rdev->desc->continuous_voltage_range && |
1893 | rdev->constraints->min_uV && rdev->constraints->max_uV && |
1894 | rdev->constraints->min_uV != rdev->constraints->max_uV) |
1895 | return 1; |
1896 | } |
1897 | |
1898 | return 0; |
1899 | } |
1900 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); |
1901 | |
1902 | /** |
1903 | * regulator_count_voltages - count regulator_list_voltage() selectors |
1904 | * @regulator: regulator source |
1905 | * |
1906 | * Returns number of selectors, or negative errno. Selectors are |
1907 | * numbered starting at zero, and typically correspond to bitfields |
1908 | * in hardware registers. |
1909 | */ |
1910 | int regulator_count_voltages(struct regulator *regulator) |
1911 | { |
1912 | struct regulator_dev *rdev = regulator->rdev; |
1913 | |
1914 | return rdev->desc->n_voltages ? : -EINVAL; |
1915 | } |
1916 | EXPORT_SYMBOL_GPL(regulator_count_voltages); |
1917 | |
1918 | /** |
1919 | * regulator_list_voltage_linear - List voltages with simple calculation |
1920 | * |
1921 | * @rdev: Regulator device |
1922 | * @selector: Selector to convert into a voltage |
1923 | * |
1924 | * Regulators with a simple linear mapping between voltages and |
1925 | * selectors can set min_uV and uV_step in the regulator descriptor |
1926 | * and then use this function as their list_voltage() operation, |
1927 | */ |
1928 | int regulator_list_voltage_linear(struct regulator_dev *rdev, |
1929 | unsigned int selector) |
1930 | { |
1931 | if (selector >= rdev->desc->n_voltages) |
1932 | return -EINVAL; |
1933 | if (selector < rdev->desc->linear_min_sel) |
1934 | return 0; |
1935 | |
1936 | selector -= rdev->desc->linear_min_sel; |
1937 | |
1938 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); |
1939 | } |
1940 | EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); |
1941 | |
1942 | /** |
1943 | * regulator_list_voltage_table - List voltages with table based mapping |
1944 | * |
1945 | * @rdev: Regulator device |
1946 | * @selector: Selector to convert into a voltage |
1947 | * |
1948 | * Regulators with table based mapping between voltages and |
1949 | * selectors can set volt_table in the regulator descriptor |
1950 | * and then use this function as their list_voltage() operation. |
1951 | */ |
1952 | int regulator_list_voltage_table(struct regulator_dev *rdev, |
1953 | unsigned int selector) |
1954 | { |
1955 | if (!rdev->desc->volt_table) { |
1956 | BUG_ON(!rdev->desc->volt_table); |
1957 | return -EINVAL; |
1958 | } |
1959 | |
1960 | if (selector >= rdev->desc->n_voltages) |
1961 | return -EINVAL; |
1962 | |
1963 | return rdev->desc->volt_table[selector]; |
1964 | } |
1965 | EXPORT_SYMBOL_GPL(regulator_list_voltage_table); |
1966 | |
1967 | /** |
1968 | * regulator_list_voltage - enumerate supported voltages |
1969 | * @regulator: regulator source |
1970 | * @selector: identify voltage to list |
1971 | * Context: can sleep |
1972 | * |
1973 | * Returns a voltage that can be passed to @regulator_set_voltage(), |
1974 | * zero if this selector code can't be used on this system, or a |
1975 | * negative errno. |
1976 | */ |
1977 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) |
1978 | { |
1979 | struct regulator_dev *rdev = regulator->rdev; |
1980 | struct regulator_ops *ops = rdev->desc->ops; |
1981 | int ret; |
1982 | |
1983 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) |
1984 | return -EINVAL; |
1985 | |
1986 | mutex_lock(&rdev->mutex); |
1987 | ret = ops->list_voltage(rdev, selector); |
1988 | mutex_unlock(&rdev->mutex); |
1989 | |
1990 | if (ret > 0) { |
1991 | if (ret < rdev->constraints->min_uV) |
1992 | ret = 0; |
1993 | else if (ret > rdev->constraints->max_uV) |
1994 | ret = 0; |
1995 | } |
1996 | |
1997 | return ret; |
1998 | } |
1999 | EXPORT_SYMBOL_GPL(regulator_list_voltage); |
2000 | |
2001 | /** |
2002 | * regulator_is_supported_voltage - check if a voltage range can be supported |
2003 | * |
2004 | * @regulator: Regulator to check. |
2005 | * @min_uV: Minimum required voltage in uV. |
2006 | * @max_uV: Maximum required voltage in uV. |
2007 | * |
2008 | * Returns a boolean or a negative error code. |
2009 | */ |
2010 | int regulator_is_supported_voltage(struct regulator *regulator, |
2011 | int min_uV, int max_uV) |
2012 | { |
2013 | struct regulator_dev *rdev = regulator->rdev; |
2014 | int i, voltages, ret; |
2015 | |
2016 | /* If we can't change voltage check the current voltage */ |
2017 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2018 | ret = regulator_get_voltage(regulator); |
2019 | if (ret >= 0) |
2020 | return (min_uV <= ret && ret <= max_uV); |
2021 | else |
2022 | return ret; |
2023 | } |
2024 | |
2025 | /* Any voltage within constrains range is fine? */ |
2026 | if (rdev->desc->continuous_voltage_range) |
2027 | return min_uV >= rdev->constraints->min_uV && |
2028 | max_uV <= rdev->constraints->max_uV; |
2029 | |
2030 | ret = regulator_count_voltages(regulator); |
2031 | if (ret < 0) |
2032 | return ret; |
2033 | voltages = ret; |
2034 | |
2035 | for (i = 0; i < voltages; i++) { |
2036 | ret = regulator_list_voltage(regulator, i); |
2037 | |
2038 | if (ret >= min_uV && ret <= max_uV) |
2039 | return 1; |
2040 | } |
2041 | |
2042 | return 0; |
2043 | } |
2044 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
2045 | |
2046 | /** |
2047 | * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users |
2048 | * |
2049 | * @rdev: regulator to operate on |
2050 | * |
2051 | * Regulators that use regmap for their register I/O can set the |
2052 | * vsel_reg and vsel_mask fields in their descriptor and then use this |
2053 | * as their get_voltage_vsel operation, saving some code. |
2054 | */ |
2055 | int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) |
2056 | { |
2057 | unsigned int val; |
2058 | int ret; |
2059 | |
2060 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); |
2061 | if (ret != 0) |
2062 | return ret; |
2063 | |
2064 | val &= rdev->desc->vsel_mask; |
2065 | val >>= ffs(rdev->desc->vsel_mask) - 1; |
2066 | |
2067 | return val; |
2068 | } |
2069 | EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); |
2070 | |
2071 | /** |
2072 | * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users |
2073 | * |
2074 | * @rdev: regulator to operate on |
2075 | * @sel: Selector to set |
2076 | * |
2077 | * Regulators that use regmap for their register I/O can set the |
2078 | * vsel_reg and vsel_mask fields in their descriptor and then use this |
2079 | * as their set_voltage_vsel operation, saving some code. |
2080 | */ |
2081 | int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) |
2082 | { |
2083 | int ret; |
2084 | |
2085 | sel <<= ffs(rdev->desc->vsel_mask) - 1; |
2086 | |
2087 | ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, |
2088 | rdev->desc->vsel_mask, sel); |
2089 | if (ret) |
2090 | return ret; |
2091 | |
2092 | if (rdev->desc->apply_bit) |
2093 | ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, |
2094 | rdev->desc->apply_bit, |
2095 | rdev->desc->apply_bit); |
2096 | return ret; |
2097 | } |
2098 | EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); |
2099 | |
2100 | /** |
2101 | * regulator_map_voltage_iterate - map_voltage() based on list_voltage() |
2102 | * |
2103 | * @rdev: Regulator to operate on |
2104 | * @min_uV: Lower bound for voltage |
2105 | * @max_uV: Upper bound for voltage |
2106 | * |
2107 | * Drivers implementing set_voltage_sel() and list_voltage() can use |
2108 | * this as their map_voltage() operation. It will find a suitable |
2109 | * voltage by calling list_voltage() until it gets something in bounds |
2110 | * for the requested voltages. |
2111 | */ |
2112 | int regulator_map_voltage_iterate(struct regulator_dev *rdev, |
2113 | int min_uV, int max_uV) |
2114 | { |
2115 | int best_val = INT_MAX; |
2116 | int selector = 0; |
2117 | int i, ret; |
2118 | |
2119 | /* Find the smallest voltage that falls within the specified |
2120 | * range. |
2121 | */ |
2122 | for (i = 0; i < rdev->desc->n_voltages; i++) { |
2123 | ret = rdev->desc->ops->list_voltage(rdev, i); |
2124 | if (ret < 0) |
2125 | continue; |
2126 | |
2127 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { |
2128 | best_val = ret; |
2129 | selector = i; |
2130 | } |
2131 | } |
2132 | |
2133 | if (best_val != INT_MAX) |
2134 | return selector; |
2135 | else |
2136 | return -EINVAL; |
2137 | } |
2138 | EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); |
2139 | |
2140 | /** |
2141 | * regulator_map_voltage_linear - map_voltage() for simple linear mappings |
2142 | * |
2143 | * @rdev: Regulator to operate on |
2144 | * @min_uV: Lower bound for voltage |
2145 | * @max_uV: Upper bound for voltage |
2146 | * |
2147 | * Drivers providing min_uV and uV_step in their regulator_desc can |
2148 | * use this as their map_voltage() operation. |
2149 | */ |
2150 | int regulator_map_voltage_linear(struct regulator_dev *rdev, |
2151 | int min_uV, int max_uV) |
2152 | { |
2153 | int ret, voltage; |
2154 | |
2155 | /* Allow uV_step to be 0 for fixed voltage */ |
2156 | if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { |
2157 | if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) |
2158 | return 0; |
2159 | else |
2160 | return -EINVAL; |
2161 | } |
2162 | |
2163 | if (!rdev->desc->uV_step) { |
2164 | BUG_ON(!rdev->desc->uV_step); |
2165 | return -EINVAL; |
2166 | } |
2167 | |
2168 | if (min_uV < rdev->desc->min_uV) |
2169 | min_uV = rdev->desc->min_uV; |
2170 | |
2171 | ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
2172 | if (ret < 0) |
2173 | return ret; |
2174 | |
2175 | ret += rdev->desc->linear_min_sel; |
2176 | |
2177 | /* Map back into a voltage to verify we're still in bounds */ |
2178 | voltage = rdev->desc->ops->list_voltage(rdev, ret); |
2179 | if (voltage < min_uV || voltage > max_uV) |
2180 | return -EINVAL; |
2181 | |
2182 | return ret; |
2183 | } |
2184 | EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); |
2185 | |
2186 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2187 | int min_uV, int max_uV) |
2188 | { |
2189 | int ret; |
2190 | int delay = 0; |
2191 | int best_val = 0; |
2192 | unsigned int selector; |
2193 | int old_selector = -1; |
2194 | |
2195 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); |
2196 | |
2197 | min_uV += rdev->constraints->uV_offset; |
2198 | max_uV += rdev->constraints->uV_offset; |
2199 | |
2200 | /* |
2201 | * If we can't obtain the old selector there is not enough |
2202 | * info to call set_voltage_time_sel(). |
2203 | */ |
2204 | if (_regulator_is_enabled(rdev) && |
2205 | rdev->desc->ops->set_voltage_time_sel && |
2206 | rdev->desc->ops->get_voltage_sel) { |
2207 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); |
2208 | if (old_selector < 0) |
2209 | return old_selector; |
2210 | } |
2211 | |
2212 | if (rdev->desc->ops->set_voltage) { |
2213 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, |
2214 | &selector); |
2215 | |
2216 | if (ret >= 0) { |
2217 | if (rdev->desc->ops->list_voltage) |
2218 | best_val = rdev->desc->ops->list_voltage(rdev, |
2219 | selector); |
2220 | else |
2221 | best_val = _regulator_get_voltage(rdev); |
2222 | } |
2223 | |
2224 | } else if (rdev->desc->ops->set_voltage_sel) { |
2225 | if (rdev->desc->ops->map_voltage) { |
2226 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2227 | max_uV); |
2228 | } else { |
2229 | if (rdev->desc->ops->list_voltage == |
2230 | regulator_list_voltage_linear) |
2231 | ret = regulator_map_voltage_linear(rdev, |
2232 | min_uV, max_uV); |
2233 | else |
2234 | ret = regulator_map_voltage_iterate(rdev, |
2235 | min_uV, max_uV); |
2236 | } |
2237 | |
2238 | if (ret >= 0) { |
2239 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2240 | if (min_uV <= best_val && max_uV >= best_val) { |
2241 | selector = ret; |
2242 | if (old_selector == selector) |
2243 | ret = 0; |
2244 | else |
2245 | ret = rdev->desc->ops->set_voltage_sel( |
2246 | rdev, ret); |
2247 | } else { |
2248 | ret = -EINVAL; |
2249 | } |
2250 | } |
2251 | } else { |
2252 | ret = -EINVAL; |
2253 | } |
2254 | |
2255 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
2256 | if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && |
2257 | old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { |
2258 | |
2259 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2260 | old_selector, selector); |
2261 | if (delay < 0) { |
2262 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", |
2263 | delay); |
2264 | delay = 0; |
2265 | } |
2266 | |
2267 | /* Insert any necessary delays */ |
2268 | if (delay >= 1000) { |
2269 | mdelay(delay / 1000); |
2270 | udelay(delay % 1000); |
2271 | } else if (delay) { |
2272 | udelay(delay); |
2273 | } |
2274 | } |
2275 | |
2276 | if (ret == 0 && best_val >= 0) { |
2277 | unsigned long data = best_val; |
2278 | |
2279 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2280 | (void *)data); |
2281 | } |
2282 | |
2283 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
2284 | |
2285 | return ret; |
2286 | } |
2287 | |
2288 | /** |
2289 | * regulator_set_voltage - set regulator output voltage |
2290 | * @regulator: regulator source |
2291 | * @min_uV: Minimum required voltage in uV |
2292 | * @max_uV: Maximum acceptable voltage in uV |
2293 | * |
2294 | * Sets a voltage regulator to the desired output voltage. This can be set |
2295 | * during any regulator state. IOW, regulator can be disabled or enabled. |
2296 | * |
2297 | * If the regulator is enabled then the voltage will change to the new value |
2298 | * immediately otherwise if the regulator is disabled the regulator will |
2299 | * output at the new voltage when enabled. |
2300 | * |
2301 | * NOTE: If the regulator is shared between several devices then the lowest |
2302 | * request voltage that meets the system constraints will be used. |
2303 | * Regulator system constraints must be set for this regulator before |
2304 | * calling this function otherwise this call will fail. |
2305 | */ |
2306 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) |
2307 | { |
2308 | struct regulator_dev *rdev = regulator->rdev; |
2309 | int ret = 0; |
2310 | int old_min_uV, old_max_uV; |
2311 | |
2312 | mutex_lock(&rdev->mutex); |
2313 | |
2314 | /* If we're setting the same range as last time the change |
2315 | * should be a noop (some cpufreq implementations use the same |
2316 | * voltage for multiple frequencies, for example). |
2317 | */ |
2318 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) |
2319 | goto out; |
2320 | |
2321 | /* sanity check */ |
2322 | if (!rdev->desc->ops->set_voltage && |
2323 | !rdev->desc->ops->set_voltage_sel) { |
2324 | ret = -EINVAL; |
2325 | goto out; |
2326 | } |
2327 | |
2328 | /* constraints check */ |
2329 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); |
2330 | if (ret < 0) |
2331 | goto out; |
2332 | |
2333 | /* restore original values in case of error */ |
2334 | old_min_uV = regulator->min_uV; |
2335 | old_max_uV = regulator->max_uV; |
2336 | regulator->min_uV = min_uV; |
2337 | regulator->max_uV = max_uV; |
2338 | |
2339 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2340 | if (ret < 0) |
2341 | goto out2; |
2342 | |
2343 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
2344 | if (ret < 0) |
2345 | goto out2; |
2346 | |
2347 | out: |
2348 | mutex_unlock(&rdev->mutex); |
2349 | return ret; |
2350 | out2: |
2351 | regulator->min_uV = old_min_uV; |
2352 | regulator->max_uV = old_max_uV; |
2353 | mutex_unlock(&rdev->mutex); |
2354 | return ret; |
2355 | } |
2356 | EXPORT_SYMBOL_GPL(regulator_set_voltage); |
2357 | |
2358 | /** |
2359 | * regulator_set_voltage_time - get raise/fall time |
2360 | * @regulator: regulator source |
2361 | * @old_uV: starting voltage in microvolts |
2362 | * @new_uV: target voltage in microvolts |
2363 | * |
2364 | * Provided with the starting and ending voltage, this function attempts to |
2365 | * calculate the time in microseconds required to rise or fall to this new |
2366 | * voltage. |
2367 | */ |
2368 | int regulator_set_voltage_time(struct regulator *regulator, |
2369 | int old_uV, int new_uV) |
2370 | { |
2371 | struct regulator_dev *rdev = regulator->rdev; |
2372 | struct regulator_ops *ops = rdev->desc->ops; |
2373 | int old_sel = -1; |
2374 | int new_sel = -1; |
2375 | int voltage; |
2376 | int i; |
2377 | |
2378 | /* Currently requires operations to do this */ |
2379 | if (!ops->list_voltage || !ops->set_voltage_time_sel |
2380 | || !rdev->desc->n_voltages) |
2381 | return -EINVAL; |
2382 | |
2383 | for (i = 0; i < rdev->desc->n_voltages; i++) { |
2384 | /* We only look for exact voltage matches here */ |
2385 | voltage = regulator_list_voltage(regulator, i); |
2386 | if (voltage < 0) |
2387 | return -EINVAL; |
2388 | if (voltage == 0) |
2389 | continue; |
2390 | if (voltage == old_uV) |
2391 | old_sel = i; |
2392 | if (voltage == new_uV) |
2393 | new_sel = i; |
2394 | } |
2395 | |
2396 | if (old_sel < 0 || new_sel < 0) |
2397 | return -EINVAL; |
2398 | |
2399 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); |
2400 | } |
2401 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); |
2402 | |
2403 | /** |
2404 | * regulator_set_voltage_time_sel - get raise/fall time |
2405 | * @rdev: regulator source device |
2406 | * @old_selector: selector for starting voltage |
2407 | * @new_selector: selector for target voltage |
2408 | * |
2409 | * Provided with the starting and target voltage selectors, this function |
2410 | * returns time in microseconds required to rise or fall to this new voltage |
2411 | * |
2412 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
2413 | * set_voltage_time_sel() operation. |
2414 | */ |
2415 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, |
2416 | unsigned int old_selector, |
2417 | unsigned int new_selector) |
2418 | { |
2419 | unsigned int ramp_delay = 0; |
2420 | int old_volt, new_volt; |
2421 | |
2422 | if (rdev->constraints->ramp_delay) |
2423 | ramp_delay = rdev->constraints->ramp_delay; |
2424 | else if (rdev->desc->ramp_delay) |
2425 | ramp_delay = rdev->desc->ramp_delay; |
2426 | |
2427 | if (ramp_delay == 0) { |
2428 | rdev_warn(rdev, "ramp_delay not set\n"); |
2429 | return 0; |
2430 | } |
2431 | |
2432 | /* sanity check */ |
2433 | if (!rdev->desc->ops->list_voltage) |
2434 | return -EINVAL; |
2435 | |
2436 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2437 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); |
2438 | |
2439 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); |
2440 | } |
2441 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
2442 | |
2443 | /** |
2444 | * regulator_sync_voltage - re-apply last regulator output voltage |
2445 | * @regulator: regulator source |
2446 | * |
2447 | * Re-apply the last configured voltage. This is intended to be used |
2448 | * where some external control source the consumer is cooperating with |
2449 | * has caused the configured voltage to change. |
2450 | */ |
2451 | int regulator_sync_voltage(struct regulator *regulator) |
2452 | { |
2453 | struct regulator_dev *rdev = regulator->rdev; |
2454 | int ret, min_uV, max_uV; |
2455 | |
2456 | mutex_lock(&rdev->mutex); |
2457 | |
2458 | if (!rdev->desc->ops->set_voltage && |
2459 | !rdev->desc->ops->set_voltage_sel) { |
2460 | ret = -EINVAL; |
2461 | goto out; |
2462 | } |
2463 | |
2464 | /* This is only going to work if we've had a voltage configured. */ |
2465 | if (!regulator->min_uV && !regulator->max_uV) { |
2466 | ret = -EINVAL; |
2467 | goto out; |
2468 | } |
2469 | |
2470 | min_uV = regulator->min_uV; |
2471 | max_uV = regulator->max_uV; |
2472 | |
2473 | /* This should be a paranoia check... */ |
2474 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); |
2475 | if (ret < 0) |
2476 | goto out; |
2477 | |
2478 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2479 | if (ret < 0) |
2480 | goto out; |
2481 | |
2482 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
2483 | |
2484 | out: |
2485 | mutex_unlock(&rdev->mutex); |
2486 | return ret; |
2487 | } |
2488 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); |
2489 | |
2490 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2491 | { |
2492 | int sel, ret; |
2493 | |
2494 | if (rdev->desc->ops->get_voltage_sel) { |
2495 | sel = rdev->desc->ops->get_voltage_sel(rdev); |
2496 | if (sel < 0) |
2497 | return sel; |
2498 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
2499 | } else if (rdev->desc->ops->get_voltage) { |
2500 | ret = rdev->desc->ops->get_voltage(rdev); |
2501 | } else if (rdev->desc->ops->list_voltage) { |
2502 | ret = rdev->desc->ops->list_voltage(rdev, 0); |
2503 | } else { |
2504 | return -EINVAL; |
2505 | } |
2506 | |
2507 | if (ret < 0) |
2508 | return ret; |
2509 | return ret - rdev->constraints->uV_offset; |
2510 | } |
2511 | |
2512 | /** |
2513 | * regulator_get_voltage - get regulator output voltage |
2514 | * @regulator: regulator source |
2515 | * |
2516 | * This returns the current regulator voltage in uV. |
2517 | * |
2518 | * NOTE: If the regulator is disabled it will return the voltage value. This |
2519 | * function should not be used to determine regulator state. |
2520 | */ |
2521 | int regulator_get_voltage(struct regulator *regulator) |
2522 | { |
2523 | int ret; |
2524 | |
2525 | mutex_lock(®ulator->rdev->mutex); |
2526 | |
2527 | ret = _regulator_get_voltage(regulator->rdev); |
2528 | |
2529 | mutex_unlock(®ulator->rdev->mutex); |
2530 | |
2531 | return ret; |
2532 | } |
2533 | EXPORT_SYMBOL_GPL(regulator_get_voltage); |
2534 | |
2535 | /** |
2536 | * regulator_set_current_limit - set regulator output current limit |
2537 | * @regulator: regulator source |
2538 | * @min_uA: Minimuum supported current in uA |
2539 | * @max_uA: Maximum supported current in uA |
2540 | * |
2541 | * Sets current sink to the desired output current. This can be set during |
2542 | * any regulator state. IOW, regulator can be disabled or enabled. |
2543 | * |
2544 | * If the regulator is enabled then the current will change to the new value |
2545 | * immediately otherwise if the regulator is disabled the regulator will |
2546 | * output at the new current when enabled. |
2547 | * |
2548 | * NOTE: Regulator system constraints must be set for this regulator before |
2549 | * calling this function otherwise this call will fail. |
2550 | */ |
2551 | int regulator_set_current_limit(struct regulator *regulator, |
2552 | int min_uA, int max_uA) |
2553 | { |
2554 | struct regulator_dev *rdev = regulator->rdev; |
2555 | int ret; |
2556 | |
2557 | mutex_lock(&rdev->mutex); |
2558 | |
2559 | /* sanity check */ |
2560 | if (!rdev->desc->ops->set_current_limit) { |
2561 | ret = -EINVAL; |
2562 | goto out; |
2563 | } |
2564 | |
2565 | /* constraints check */ |
2566 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); |
2567 | if (ret < 0) |
2568 | goto out; |
2569 | |
2570 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); |
2571 | out: |
2572 | mutex_unlock(&rdev->mutex); |
2573 | return ret; |
2574 | } |
2575 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); |
2576 | |
2577 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
2578 | { |
2579 | int ret; |
2580 | |
2581 | mutex_lock(&rdev->mutex); |
2582 | |
2583 | /* sanity check */ |
2584 | if (!rdev->desc->ops->get_current_limit) { |
2585 | ret = -EINVAL; |
2586 | goto out; |
2587 | } |
2588 | |
2589 | ret = rdev->desc->ops->get_current_limit(rdev); |
2590 | out: |
2591 | mutex_unlock(&rdev->mutex); |
2592 | return ret; |
2593 | } |
2594 | |
2595 | /** |
2596 | * regulator_get_current_limit - get regulator output current |
2597 | * @regulator: regulator source |
2598 | * |
2599 | * This returns the current supplied by the specified current sink in uA. |
2600 | * |
2601 | * NOTE: If the regulator is disabled it will return the current value. This |
2602 | * function should not be used to determine regulator state. |
2603 | */ |
2604 | int regulator_get_current_limit(struct regulator *regulator) |
2605 | { |
2606 | return _regulator_get_current_limit(regulator->rdev); |
2607 | } |
2608 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); |
2609 | |
2610 | /** |
2611 | * regulator_set_mode - set regulator operating mode |
2612 | * @regulator: regulator source |
2613 | * @mode: operating mode - one of the REGULATOR_MODE constants |
2614 | * |
2615 | * Set regulator operating mode to increase regulator efficiency or improve |
2616 | * regulation performance. |
2617 | * |
2618 | * NOTE: Regulator system constraints must be set for this regulator before |
2619 | * calling this function otherwise this call will fail. |
2620 | */ |
2621 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) |
2622 | { |
2623 | struct regulator_dev *rdev = regulator->rdev; |
2624 | int ret; |
2625 | int regulator_curr_mode; |
2626 | |
2627 | mutex_lock(&rdev->mutex); |
2628 | |
2629 | /* sanity check */ |
2630 | if (!rdev->desc->ops->set_mode) { |
2631 | ret = -EINVAL; |
2632 | goto out; |
2633 | } |
2634 | |
2635 | /* return if the same mode is requested */ |
2636 | if (rdev->desc->ops->get_mode) { |
2637 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); |
2638 | if (regulator_curr_mode == mode) { |
2639 | ret = 0; |
2640 | goto out; |
2641 | } |
2642 | } |
2643 | |
2644 | /* constraints check */ |
2645 | ret = regulator_mode_constrain(rdev, &mode); |
2646 | if (ret < 0) |
2647 | goto out; |
2648 | |
2649 | ret = rdev->desc->ops->set_mode(rdev, mode); |
2650 | out: |
2651 | mutex_unlock(&rdev->mutex); |
2652 | return ret; |
2653 | } |
2654 | EXPORT_SYMBOL_GPL(regulator_set_mode); |
2655 | |
2656 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
2657 | { |
2658 | int ret; |
2659 | |
2660 | mutex_lock(&rdev->mutex); |
2661 | |
2662 | /* sanity check */ |
2663 | if (!rdev->desc->ops->get_mode) { |
2664 | ret = -EINVAL; |
2665 | goto out; |
2666 | } |
2667 | |
2668 | ret = rdev->desc->ops->get_mode(rdev); |
2669 | out: |
2670 | mutex_unlock(&rdev->mutex); |
2671 | return ret; |
2672 | } |
2673 | |
2674 | /** |
2675 | * regulator_get_mode - get regulator operating mode |
2676 | * @regulator: regulator source |
2677 | * |
2678 | * Get the current regulator operating mode. |
2679 | */ |
2680 | unsigned int regulator_get_mode(struct regulator *regulator) |
2681 | { |
2682 | return _regulator_get_mode(regulator->rdev); |
2683 | } |
2684 | EXPORT_SYMBOL_GPL(regulator_get_mode); |
2685 | |
2686 | /** |
2687 | * regulator_set_optimum_mode - set regulator optimum operating mode |
2688 | * @regulator: regulator source |
2689 | * @uA_load: load current |
2690 | * |
2691 | * Notifies the regulator core of a new device load. This is then used by |
2692 | * DRMS (if enabled by constraints) to set the most efficient regulator |
2693 | * operating mode for the new regulator loading. |
2694 | * |
2695 | * Consumer devices notify their supply regulator of the maximum power |
2696 | * they will require (can be taken from device datasheet in the power |
2697 | * consumption tables) when they change operational status and hence power |
2698 | * state. Examples of operational state changes that can affect power |
2699 | * consumption are :- |
2700 | * |
2701 | * o Device is opened / closed. |
2702 | * o Device I/O is about to begin or has just finished. |
2703 | * o Device is idling in between work. |
2704 | * |
2705 | * This information is also exported via sysfs to userspace. |
2706 | * |
2707 | * DRMS will sum the total requested load on the regulator and change |
2708 | * to the most efficient operating mode if platform constraints allow. |
2709 | * |
2710 | * Returns the new regulator mode or error. |
2711 | */ |
2712 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) |
2713 | { |
2714 | struct regulator_dev *rdev = regulator->rdev; |
2715 | struct regulator *consumer; |
2716 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
2717 | unsigned int mode; |
2718 | |
2719 | if (rdev->supply) |
2720 | input_uV = regulator_get_voltage(rdev->supply); |
2721 | |
2722 | mutex_lock(&rdev->mutex); |
2723 | |
2724 | /* |
2725 | * first check to see if we can set modes at all, otherwise just |
2726 | * tell the consumer everything is OK. |
2727 | */ |
2728 | regulator->uA_load = uA_load; |
2729 | ret = regulator_check_drms(rdev); |
2730 | if (ret < 0) { |
2731 | ret = 0; |
2732 | goto out; |
2733 | } |
2734 | |
2735 | if (!rdev->desc->ops->get_optimum_mode) |
2736 | goto out; |
2737 | |
2738 | /* |
2739 | * we can actually do this so any errors are indicators of |
2740 | * potential real failure. |
2741 | */ |
2742 | ret = -EINVAL; |
2743 | |
2744 | if (!rdev->desc->ops->set_mode) |
2745 | goto out; |
2746 | |
2747 | /* get output voltage */ |
2748 | output_uV = _regulator_get_voltage(rdev); |
2749 | if (output_uV <= 0) { |
2750 | rdev_err(rdev, "invalid output voltage found\n"); |
2751 | goto out; |
2752 | } |
2753 | |
2754 | /* No supply? Use constraint voltage */ |
2755 | if (input_uV <= 0) |
2756 | input_uV = rdev->constraints->input_uV; |
2757 | if (input_uV <= 0) { |
2758 | rdev_err(rdev, "invalid input voltage found\n"); |
2759 | goto out; |
2760 | } |
2761 | |
2762 | /* calc total requested load for this regulator */ |
2763 | list_for_each_entry(consumer, &rdev->consumer_list, list) |
2764 | total_uA_load += consumer->uA_load; |
2765 | |
2766 | mode = rdev->desc->ops->get_optimum_mode(rdev, |
2767 | input_uV, output_uV, |
2768 | total_uA_load); |
2769 | ret = regulator_mode_constrain(rdev, &mode); |
2770 | if (ret < 0) { |
2771 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2772 | total_uA_load, input_uV, output_uV); |
2773 | goto out; |
2774 | } |
2775 | |
2776 | ret = rdev->desc->ops->set_mode(rdev, mode); |
2777 | if (ret < 0) { |
2778 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
2779 | goto out; |
2780 | } |
2781 | ret = mode; |
2782 | out: |
2783 | mutex_unlock(&rdev->mutex); |
2784 | return ret; |
2785 | } |
2786 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); |
2787 | |
2788 | /** |
2789 | * regulator_set_bypass_regmap - Default set_bypass() using regmap |
2790 | * |
2791 | * @rdev: device to operate on. |
2792 | * @enable: state to set. |
2793 | */ |
2794 | int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) |
2795 | { |
2796 | unsigned int val; |
2797 | |
2798 | if (enable) |
2799 | val = rdev->desc->bypass_mask; |
2800 | else |
2801 | val = 0; |
2802 | |
2803 | return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, |
2804 | rdev->desc->bypass_mask, val); |
2805 | } |
2806 | EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); |
2807 | |
2808 | /** |
2809 | * regulator_get_bypass_regmap - Default get_bypass() using regmap |
2810 | * |
2811 | * @rdev: device to operate on. |
2812 | * @enable: current state. |
2813 | */ |
2814 | int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) |
2815 | { |
2816 | unsigned int val; |
2817 | int ret; |
2818 | |
2819 | ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); |
2820 | if (ret != 0) |
2821 | return ret; |
2822 | |
2823 | *enable = val & rdev->desc->bypass_mask; |
2824 | |
2825 | return 0; |
2826 | } |
2827 | EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); |
2828 | |
2829 | /** |
2830 | * regulator_allow_bypass - allow the regulator to go into bypass mode |
2831 | * |
2832 | * @regulator: Regulator to configure |
2833 | * @enable: enable or disable bypass mode |
2834 | * |
2835 | * Allow the regulator to go into bypass mode if all other consumers |
2836 | * for the regulator also enable bypass mode and the machine |
2837 | * constraints allow this. Bypass mode means that the regulator is |
2838 | * simply passing the input directly to the output with no regulation. |
2839 | */ |
2840 | int regulator_allow_bypass(struct regulator *regulator, bool enable) |
2841 | { |
2842 | struct regulator_dev *rdev = regulator->rdev; |
2843 | int ret = 0; |
2844 | |
2845 | if (!rdev->desc->ops->set_bypass) |
2846 | return 0; |
2847 | |
2848 | if (rdev->constraints && |
2849 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) |
2850 | return 0; |
2851 | |
2852 | mutex_lock(&rdev->mutex); |
2853 | |
2854 | if (enable && !regulator->bypass) { |
2855 | rdev->bypass_count++; |
2856 | |
2857 | if (rdev->bypass_count == rdev->open_count) { |
2858 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
2859 | if (ret != 0) |
2860 | rdev->bypass_count--; |
2861 | } |
2862 | |
2863 | } else if (!enable && regulator->bypass) { |
2864 | rdev->bypass_count--; |
2865 | |
2866 | if (rdev->bypass_count != rdev->open_count) { |
2867 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
2868 | if (ret != 0) |
2869 | rdev->bypass_count++; |
2870 | } |
2871 | } |
2872 | |
2873 | if (ret == 0) |
2874 | regulator->bypass = enable; |
2875 | |
2876 | mutex_unlock(&rdev->mutex); |
2877 | |
2878 | return ret; |
2879 | } |
2880 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); |
2881 | |
2882 | /** |
2883 | * regulator_register_notifier - register regulator event notifier |
2884 | * @regulator: regulator source |
2885 | * @nb: notifier block |
2886 | * |
2887 | * Register notifier block to receive regulator events. |
2888 | */ |
2889 | int regulator_register_notifier(struct regulator *regulator, |
2890 | struct notifier_block *nb) |
2891 | { |
2892 | return blocking_notifier_chain_register(®ulator->rdev->notifier, |
2893 | nb); |
2894 | } |
2895 | EXPORT_SYMBOL_GPL(regulator_register_notifier); |
2896 | |
2897 | /** |
2898 | * regulator_unregister_notifier - unregister regulator event notifier |
2899 | * @regulator: regulator source |
2900 | * @nb: notifier block |
2901 | * |
2902 | * Unregister regulator event notifier block. |
2903 | */ |
2904 | int regulator_unregister_notifier(struct regulator *regulator, |
2905 | struct notifier_block *nb) |
2906 | { |
2907 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, |
2908 | nb); |
2909 | } |
2910 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); |
2911 | |
2912 | /* notify regulator consumers and downstream regulator consumers. |
2913 | * Note mutex must be held by caller. |
2914 | */ |
2915 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2916 | unsigned long event, void *data) |
2917 | { |
2918 | /* call rdev chain first */ |
2919 | blocking_notifier_call_chain(&rdev->notifier, event, data); |
2920 | } |
2921 | |
2922 | /** |
2923 | * regulator_bulk_get - get multiple regulator consumers |
2924 | * |
2925 | * @dev: Device to supply |
2926 | * @num_consumers: Number of consumers to register |
2927 | * @consumers: Configuration of consumers; clients are stored here. |
2928 | * |
2929 | * @return 0 on success, an errno on failure. |
2930 | * |
2931 | * This helper function allows drivers to get several regulator |
2932 | * consumers in one operation. If any of the regulators cannot be |
2933 | * acquired then any regulators that were allocated will be freed |
2934 | * before returning to the caller. |
2935 | */ |
2936 | int regulator_bulk_get(struct device *dev, int num_consumers, |
2937 | struct regulator_bulk_data *consumers) |
2938 | { |
2939 | int i; |
2940 | int ret; |
2941 | |
2942 | for (i = 0; i < num_consumers; i++) |
2943 | consumers[i].consumer = NULL; |
2944 | |
2945 | for (i = 0; i < num_consumers; i++) { |
2946 | consumers[i].consumer = regulator_get(dev, |
2947 | consumers[i].supply); |
2948 | if (IS_ERR(consumers[i].consumer)) { |
2949 | ret = PTR_ERR(consumers[i].consumer); |
2950 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2951 | consumers[i].supply, ret); |
2952 | consumers[i].consumer = NULL; |
2953 | goto err; |
2954 | } |
2955 | } |
2956 | |
2957 | return 0; |
2958 | |
2959 | err: |
2960 | while (--i >= 0) |
2961 | regulator_put(consumers[i].consumer); |
2962 | |
2963 | return ret; |
2964 | } |
2965 | EXPORT_SYMBOL_GPL(regulator_bulk_get); |
2966 | |
2967 | /** |
2968 | * devm_regulator_bulk_get - managed get multiple regulator consumers |
2969 | * |
2970 | * @dev: Device to supply |
2971 | * @num_consumers: Number of consumers to register |
2972 | * @consumers: Configuration of consumers; clients are stored here. |
2973 | * |
2974 | * @return 0 on success, an errno on failure. |
2975 | * |
2976 | * This helper function allows drivers to get several regulator |
2977 | * consumers in one operation with management, the regulators will |
2978 | * automatically be freed when the device is unbound. If any of the |
2979 | * regulators cannot be acquired then any regulators that were |
2980 | * allocated will be freed before returning to the caller. |
2981 | */ |
2982 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, |
2983 | struct regulator_bulk_data *consumers) |
2984 | { |
2985 | int i; |
2986 | int ret; |
2987 | |
2988 | for (i = 0; i < num_consumers; i++) |
2989 | consumers[i].consumer = NULL; |
2990 | |
2991 | for (i = 0; i < num_consumers; i++) { |
2992 | consumers[i].consumer = devm_regulator_get(dev, |
2993 | consumers[i].supply); |
2994 | if (IS_ERR(consumers[i].consumer)) { |
2995 | ret = PTR_ERR(consumers[i].consumer); |
2996 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2997 | consumers[i].supply, ret); |
2998 | consumers[i].consumer = NULL; |
2999 | goto err; |
3000 | } |
3001 | } |
3002 | |
3003 | return 0; |
3004 | |
3005 | err: |
3006 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) |
3007 | devm_regulator_put(consumers[i].consumer); |
3008 | |
3009 | return ret; |
3010 | } |
3011 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); |
3012 | |
3013 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3014 | { |
3015 | struct regulator_bulk_data *bulk = data; |
3016 | |
3017 | bulk->ret = regulator_enable(bulk->consumer); |
3018 | } |
3019 | |
3020 | /** |
3021 | * regulator_bulk_enable - enable multiple regulator consumers |
3022 | * |
3023 | * @num_consumers: Number of consumers |
3024 | * @consumers: Consumer data; clients are stored here. |
3025 | * @return 0 on success, an errno on failure |
3026 | * |
3027 | * This convenience API allows consumers to enable multiple regulator |
3028 | * clients in a single API call. If any consumers cannot be enabled |
3029 | * then any others that were enabled will be disabled again prior to |
3030 | * return. |
3031 | */ |
3032 | int regulator_bulk_enable(int num_consumers, |
3033 | struct regulator_bulk_data *consumers) |
3034 | { |
3035 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
3036 | int i; |
3037 | int ret = 0; |
3038 | |
3039 | for (i = 0; i < num_consumers; i++) { |
3040 | if (consumers[i].consumer->always_on) |
3041 | consumers[i].ret = 0; |
3042 | else |
3043 | async_schedule_domain(regulator_bulk_enable_async, |
3044 | &consumers[i], &async_domain); |
3045 | } |
3046 | |
3047 | async_synchronize_full_domain(&async_domain); |
3048 | |
3049 | /* If any consumer failed we need to unwind any that succeeded */ |
3050 | for (i = 0; i < num_consumers; i++) { |
3051 | if (consumers[i].ret != 0) { |
3052 | ret = consumers[i].ret; |
3053 | goto err; |
3054 | } |
3055 | } |
3056 | |
3057 | return 0; |
3058 | |
3059 | err: |
3060 | for (i = 0; i < num_consumers; i++) { |
3061 | if (consumers[i].ret < 0) |
3062 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, |
3063 | consumers[i].ret); |
3064 | else |
3065 | regulator_disable(consumers[i].consumer); |
3066 | } |
3067 | |
3068 | return ret; |
3069 | } |
3070 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); |
3071 | |
3072 | /** |
3073 | * regulator_bulk_disable - disable multiple regulator consumers |
3074 | * |
3075 | * @num_consumers: Number of consumers |
3076 | * @consumers: Consumer data; clients are stored here. |
3077 | * @return 0 on success, an errno on failure |
3078 | * |
3079 | * This convenience API allows consumers to disable multiple regulator |
3080 | * clients in a single API call. If any consumers cannot be disabled |
3081 | * then any others that were disabled will be enabled again prior to |
3082 | * return. |
3083 | */ |
3084 | int regulator_bulk_disable(int num_consumers, |
3085 | struct regulator_bulk_data *consumers) |
3086 | { |
3087 | int i; |
3088 | int ret, r; |
3089 | |
3090 | for (i = num_consumers - 1; i >= 0; --i) { |
3091 | ret = regulator_disable(consumers[i].consumer); |
3092 | if (ret != 0) |
3093 | goto err; |
3094 | } |
3095 | |
3096 | return 0; |
3097 | |
3098 | err: |
3099 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
3100 | for (++i; i < num_consumers; ++i) { |
3101 | r = regulator_enable(consumers[i].consumer); |
3102 | if (r != 0) |
3103 | pr_err("Failed to reename %s: %d\n", |
3104 | consumers[i].supply, r); |
3105 | } |
3106 | |
3107 | return ret; |
3108 | } |
3109 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); |
3110 | |
3111 | /** |
3112 | * regulator_bulk_force_disable - force disable multiple regulator consumers |
3113 | * |
3114 | * @num_consumers: Number of consumers |
3115 | * @consumers: Consumer data; clients are stored here. |
3116 | * @return 0 on success, an errno on failure |
3117 | * |
3118 | * This convenience API allows consumers to forcibly disable multiple regulator |
3119 | * clients in a single API call. |
3120 | * NOTE: This should be used for situations when device damage will |
3121 | * likely occur if the regulators are not disabled (e.g. over temp). |
3122 | * Although regulator_force_disable function call for some consumers can |
3123 | * return error numbers, the function is called for all consumers. |
3124 | */ |
3125 | int regulator_bulk_force_disable(int num_consumers, |
3126 | struct regulator_bulk_data *consumers) |
3127 | { |
3128 | int i; |
3129 | int ret; |
3130 | |
3131 | for (i = 0; i < num_consumers; i++) |
3132 | consumers[i].ret = |
3133 | regulator_force_disable(consumers[i].consumer); |
3134 | |
3135 | for (i = 0; i < num_consumers; i++) { |
3136 | if (consumers[i].ret != 0) { |
3137 | ret = consumers[i].ret; |
3138 | goto out; |
3139 | } |
3140 | } |
3141 | |
3142 | return 0; |
3143 | out: |
3144 | return ret; |
3145 | } |
3146 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); |
3147 | |
3148 | /** |
3149 | * regulator_bulk_free - free multiple regulator consumers |
3150 | * |
3151 | * @num_consumers: Number of consumers |
3152 | * @consumers: Consumer data; clients are stored here. |
3153 | * |
3154 | * This convenience API allows consumers to free multiple regulator |
3155 | * clients in a single API call. |
3156 | */ |
3157 | void regulator_bulk_free(int num_consumers, |
3158 | struct regulator_bulk_data *consumers) |
3159 | { |
3160 | int i; |
3161 | |
3162 | for (i = 0; i < num_consumers; i++) { |
3163 | regulator_put(consumers[i].consumer); |
3164 | consumers[i].consumer = NULL; |
3165 | } |
3166 | } |
3167 | EXPORT_SYMBOL_GPL(regulator_bulk_free); |
3168 | |
3169 | /** |
3170 | * regulator_notifier_call_chain - call regulator event notifier |
3171 | * @rdev: regulator source |
3172 | * @event: notifier block |
3173 | * @data: callback-specific data. |
3174 | * |
3175 | * Called by regulator drivers to notify clients a regulator event has |
3176 | * occurred. We also notify regulator clients downstream. |
3177 | * Note lock must be held by caller. |
3178 | */ |
3179 | int regulator_notifier_call_chain(struct regulator_dev *rdev, |
3180 | unsigned long event, void *data) |
3181 | { |
3182 | _notifier_call_chain(rdev, event, data); |
3183 | return NOTIFY_DONE; |
3184 | |
3185 | } |
3186 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); |
3187 | |
3188 | /** |
3189 | * regulator_mode_to_status - convert a regulator mode into a status |
3190 | * |
3191 | * @mode: Mode to convert |
3192 | * |
3193 | * Convert a regulator mode into a status. |
3194 | */ |
3195 | int regulator_mode_to_status(unsigned int mode) |
3196 | { |
3197 | switch (mode) { |
3198 | case REGULATOR_MODE_FAST: |
3199 | return REGULATOR_STATUS_FAST; |
3200 | case REGULATOR_MODE_NORMAL: |
3201 | return REGULATOR_STATUS_NORMAL; |
3202 | case REGULATOR_MODE_IDLE: |
3203 | return REGULATOR_STATUS_IDLE; |
3204 | case REGULATOR_MODE_STANDBY: |
3205 | return REGULATOR_STATUS_STANDBY; |
3206 | default: |
3207 | return REGULATOR_STATUS_UNDEFINED; |
3208 | } |
3209 | } |
3210 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); |
3211 | |
3212 | /* |
3213 | * To avoid cluttering sysfs (and memory) with useless state, only |
3214 | * create attributes that can be meaningfully displayed. |
3215 | */ |
3216 | static int add_regulator_attributes(struct regulator_dev *rdev) |
3217 | { |
3218 | struct device *dev = &rdev->dev; |
3219 | struct regulator_ops *ops = rdev->desc->ops; |
3220 | int status = 0; |
3221 | |
3222 | /* some attributes need specific methods to be displayed */ |
3223 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
3224 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
3225 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { |
3226 | status = device_create_file(dev, &dev_attr_microvolts); |
3227 | if (status < 0) |
3228 | return status; |
3229 | } |
3230 | if (ops->get_current_limit) { |
3231 | status = device_create_file(dev, &dev_attr_microamps); |
3232 | if (status < 0) |
3233 | return status; |
3234 | } |
3235 | if (ops->get_mode) { |
3236 | status = device_create_file(dev, &dev_attr_opmode); |
3237 | if (status < 0) |
3238 | return status; |
3239 | } |
3240 | if (rdev->ena_gpio || ops->is_enabled) { |
3241 | status = device_create_file(dev, &dev_attr_state); |
3242 | if (status < 0) |
3243 | return status; |
3244 | } |
3245 | if (ops->get_status) { |
3246 | status = device_create_file(dev, &dev_attr_status); |
3247 | if (status < 0) |
3248 | return status; |
3249 | } |
3250 | if (ops->get_bypass) { |
3251 | status = device_create_file(dev, &dev_attr_bypass); |
3252 | if (status < 0) |
3253 | return status; |
3254 | } |
3255 | |
3256 | /* some attributes are type-specific */ |
3257 | if (rdev->desc->type == REGULATOR_CURRENT) { |
3258 | status = device_create_file(dev, &dev_attr_requested_microamps); |
3259 | if (status < 0) |
3260 | return status; |
3261 | } |
3262 | |
3263 | /* all the other attributes exist to support constraints; |
3264 | * don't show them if there are no constraints, or if the |
3265 | * relevant supporting methods are missing. |
3266 | */ |
3267 | if (!rdev->constraints) |
3268 | return status; |
3269 | |
3270 | /* constraints need specific supporting methods */ |
3271 | if (ops->set_voltage || ops->set_voltage_sel) { |
3272 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3273 | if (status < 0) |
3274 | return status; |
3275 | status = device_create_file(dev, &dev_attr_max_microvolts); |
3276 | if (status < 0) |
3277 | return status; |
3278 | } |
3279 | if (ops->set_current_limit) { |
3280 | status = device_create_file(dev, &dev_attr_min_microamps); |
3281 | if (status < 0) |
3282 | return status; |
3283 | status = device_create_file(dev, &dev_attr_max_microamps); |
3284 | if (status < 0) |
3285 | return status; |
3286 | } |
3287 | |
3288 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3289 | if (status < 0) |
3290 | return status; |
3291 | status = device_create_file(dev, &dev_attr_suspend_mem_state); |
3292 | if (status < 0) |
3293 | return status; |
3294 | status = device_create_file(dev, &dev_attr_suspend_disk_state); |
3295 | if (status < 0) |
3296 | return status; |
3297 | |
3298 | if (ops->set_suspend_voltage) { |
3299 | status = device_create_file(dev, |
3300 | &dev_attr_suspend_standby_microvolts); |
3301 | if (status < 0) |
3302 | return status; |
3303 | status = device_create_file(dev, |
3304 | &dev_attr_suspend_mem_microvolts); |
3305 | if (status < 0) |
3306 | return status; |
3307 | status = device_create_file(dev, |
3308 | &dev_attr_suspend_disk_microvolts); |
3309 | if (status < 0) |
3310 | return status; |
3311 | } |
3312 | |
3313 | if (ops->set_suspend_mode) { |
3314 | status = device_create_file(dev, |
3315 | &dev_attr_suspend_standby_mode); |
3316 | if (status < 0) |
3317 | return status; |
3318 | status = device_create_file(dev, |
3319 | &dev_attr_suspend_mem_mode); |
3320 | if (status < 0) |
3321 | return status; |
3322 | status = device_create_file(dev, |
3323 | &dev_attr_suspend_disk_mode); |
3324 | if (status < 0) |
3325 | return status; |
3326 | } |
3327 | |
3328 | return status; |
3329 | } |
3330 | |
3331 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3332 | { |
3333 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
3334 | if (!rdev->debugfs) { |
3335 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
3336 | return; |
3337 | } |
3338 | |
3339 | debugfs_create_u32("use_count", 0444, rdev->debugfs, |
3340 | &rdev->use_count); |
3341 | debugfs_create_u32("open_count", 0444, rdev->debugfs, |
3342 | &rdev->open_count); |
3343 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3344 | &rdev->bypass_count); |
3345 | } |
3346 | |
3347 | /** |
3348 | * regulator_register - register regulator |
3349 | * @regulator_desc: regulator to register |
3350 | * @config: runtime configuration for regulator |
3351 | * |
3352 | * Called by regulator drivers to register a regulator. |
3353 | * Returns a valid pointer to struct regulator_dev on success |
3354 | * or an ERR_PTR() on error. |
3355 | */ |
3356 | struct regulator_dev * |
3357 | regulator_register(const struct regulator_desc *regulator_desc, |
3358 | const struct regulator_config *config) |
3359 | { |
3360 | const struct regulation_constraints *constraints = NULL; |
3361 | const struct regulator_init_data *init_data; |
3362 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3363 | struct regulator_dev *rdev; |
3364 | struct device *dev; |
3365 | int ret, i; |
3366 | const char *supply = NULL; |
3367 | |
3368 | if (regulator_desc == NULL || config == NULL) |
3369 | return ERR_PTR(-EINVAL); |
3370 | |
3371 | dev = config->dev; |
3372 | WARN_ON(!dev); |
3373 | |
3374 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3375 | return ERR_PTR(-EINVAL); |
3376 | |
3377 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3378 | regulator_desc->type != REGULATOR_CURRENT) |
3379 | return ERR_PTR(-EINVAL); |
3380 | |
3381 | /* Only one of each should be implemented */ |
3382 | WARN_ON(regulator_desc->ops->get_voltage && |
3383 | regulator_desc->ops->get_voltage_sel); |
3384 | WARN_ON(regulator_desc->ops->set_voltage && |
3385 | regulator_desc->ops->set_voltage_sel); |
3386 | |
3387 | /* If we're using selectors we must implement list_voltage. */ |
3388 | if (regulator_desc->ops->get_voltage_sel && |
3389 | !regulator_desc->ops->list_voltage) { |
3390 | return ERR_PTR(-EINVAL); |
3391 | } |
3392 | if (regulator_desc->ops->set_voltage_sel && |
3393 | !regulator_desc->ops->list_voltage) { |
3394 | return ERR_PTR(-EINVAL); |
3395 | } |
3396 | |
3397 | init_data = config->init_data; |
3398 | |
3399 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3400 | if (rdev == NULL) |
3401 | return ERR_PTR(-ENOMEM); |
3402 | |
3403 | mutex_lock(®ulator_list_mutex); |
3404 | |
3405 | mutex_init(&rdev->mutex); |
3406 | rdev->reg_data = config->driver_data; |
3407 | rdev->owner = regulator_desc->owner; |
3408 | rdev->desc = regulator_desc; |
3409 | if (config->regmap) |
3410 | rdev->regmap = config->regmap; |
3411 | else if (dev_get_regmap(dev, NULL)) |
3412 | rdev->regmap = dev_get_regmap(dev, NULL); |
3413 | else if (dev->parent) |
3414 | rdev->regmap = dev_get_regmap(dev->parent, NULL); |
3415 | INIT_LIST_HEAD(&rdev->consumer_list); |
3416 | INIT_LIST_HEAD(&rdev->list); |
3417 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
3418 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
3419 | |
3420 | /* preform any regulator specific init */ |
3421 | if (init_data && init_data->regulator_init) { |
3422 | ret = init_data->regulator_init(rdev->reg_data); |
3423 | if (ret < 0) |
3424 | goto clean; |
3425 | } |
3426 | |
3427 | /* register with sysfs */ |
3428 | rdev->dev.class = ®ulator_class; |
3429 | rdev->dev.of_node = config->of_node; |
3430 | rdev->dev.parent = dev; |
3431 | dev_set_name(&rdev->dev, "regulator.%d", |
3432 | atomic_inc_return(®ulator_no) - 1); |
3433 | ret = device_register(&rdev->dev); |
3434 | if (ret != 0) { |
3435 | put_device(&rdev->dev); |
3436 | goto clean; |
3437 | } |
3438 | |
3439 | dev_set_drvdata(&rdev->dev, rdev); |
3440 | |
3441 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
3442 | ret = gpio_request_one(config->ena_gpio, |
3443 | GPIOF_DIR_OUT | config->ena_gpio_flags, |
3444 | rdev_get_name(rdev)); |
3445 | if (ret != 0) { |
3446 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", |
3447 | config->ena_gpio, ret); |
3448 | goto wash; |
3449 | } |
3450 | |
3451 | rdev->ena_gpio = config->ena_gpio; |
3452 | rdev->ena_gpio_invert = config->ena_gpio_invert; |
3453 | |
3454 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) |
3455 | rdev->ena_gpio_state = 1; |
3456 | |
3457 | if (rdev->ena_gpio_invert) |
3458 | rdev->ena_gpio_state = !rdev->ena_gpio_state; |
3459 | } |
3460 | |
3461 | /* set regulator constraints */ |
3462 | if (init_data) |
3463 | constraints = &init_data->constraints; |
3464 | |
3465 | ret = set_machine_constraints(rdev, constraints); |
3466 | if (ret < 0) |
3467 | goto scrub; |
3468 | |
3469 | /* add attributes supported by this regulator */ |
3470 | ret = add_regulator_attributes(rdev); |
3471 | if (ret < 0) |
3472 | goto scrub; |
3473 | |
3474 | if (init_data && init_data->supply_regulator) |
3475 | supply = init_data->supply_regulator; |
3476 | else if (regulator_desc->supply_name) |
3477 | supply = regulator_desc->supply_name; |
3478 | |
3479 | if (supply) { |
3480 | struct regulator_dev *r; |
3481 | |
3482 | r = regulator_dev_lookup(dev, supply, &ret); |
3483 | |
3484 | if (!r) { |
3485 | dev_err(dev, "Failed to find supply %s\n", supply); |
3486 | ret = -EPROBE_DEFER; |
3487 | goto scrub; |
3488 | } |
3489 | |
3490 | ret = set_supply(rdev, r); |
3491 | if (ret < 0) |
3492 | goto scrub; |
3493 | |
3494 | /* Enable supply if rail is enabled */ |
3495 | if (_regulator_is_enabled(rdev)) { |
3496 | ret = regulator_enable(rdev->supply); |
3497 | if (ret < 0) |
3498 | goto scrub; |
3499 | } |
3500 | } |
3501 | |
3502 | /* add consumers devices */ |
3503 | if (init_data) { |
3504 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
3505 | ret = set_consumer_device_supply(rdev, |
3506 | init_data->consumer_supplies[i].dev_name, |
3507 | init_data->consumer_supplies[i].supply); |
3508 | if (ret < 0) { |
3509 | dev_err(dev, "Failed to set supply %s\n", |
3510 | init_data->consumer_supplies[i].supply); |
3511 | goto unset_supplies; |
3512 | } |
3513 | } |
3514 | } |
3515 | |
3516 | list_add(&rdev->list, ®ulator_list); |
3517 | |
3518 | rdev_init_debugfs(rdev); |
3519 | out: |
3520 | mutex_unlock(®ulator_list_mutex); |
3521 | return rdev; |
3522 | |
3523 | unset_supplies: |
3524 | unset_regulator_supplies(rdev); |
3525 | |
3526 | scrub: |
3527 | if (rdev->supply) |
3528 | _regulator_put(rdev->supply); |
3529 | if (rdev->ena_gpio) |
3530 | gpio_free(rdev->ena_gpio); |
3531 | kfree(rdev->constraints); |
3532 | wash: |
3533 | device_unregister(&rdev->dev); |
3534 | /* device core frees rdev */ |
3535 | rdev = ERR_PTR(ret); |
3536 | goto out; |
3537 | |
3538 | clean: |
3539 | kfree(rdev); |
3540 | rdev = ERR_PTR(ret); |
3541 | goto out; |
3542 | } |
3543 | EXPORT_SYMBOL_GPL(regulator_register); |
3544 | |
3545 | /** |
3546 | * regulator_unregister - unregister regulator |
3547 | * @rdev: regulator to unregister |
3548 | * |
3549 | * Called by regulator drivers to unregister a regulator. |
3550 | */ |
3551 | void regulator_unregister(struct regulator_dev *rdev) |
3552 | { |
3553 | if (rdev == NULL) |
3554 | return; |
3555 | |
3556 | if (rdev->supply) |
3557 | regulator_put(rdev->supply); |
3558 | mutex_lock(®ulator_list_mutex); |
3559 | debugfs_remove_recursive(rdev->debugfs); |
3560 | flush_work(&rdev->disable_work.work); |
3561 | WARN_ON(rdev->open_count); |
3562 | unset_regulator_supplies(rdev); |
3563 | list_del(&rdev->list); |
3564 | kfree(rdev->constraints); |
3565 | if (rdev->ena_gpio) |
3566 | gpio_free(rdev->ena_gpio); |
3567 | device_unregister(&rdev->dev); |
3568 | mutex_unlock(®ulator_list_mutex); |
3569 | } |
3570 | EXPORT_SYMBOL_GPL(regulator_unregister); |
3571 | |
3572 | /** |
3573 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
3574 | * @state: system suspend state |
3575 | * |
3576 | * Configure each regulator with it's suspend operating parameters for state. |
3577 | * This will usually be called by machine suspend code prior to supending. |
3578 | */ |
3579 | int regulator_suspend_prepare(suspend_state_t state) |
3580 | { |
3581 | struct regulator_dev *rdev; |
3582 | int ret = 0; |
3583 | |
3584 | /* ON is handled by regulator active state */ |
3585 | if (state == PM_SUSPEND_ON) |
3586 | return -EINVAL; |
3587 | |
3588 | mutex_lock(®ulator_list_mutex); |
3589 | list_for_each_entry(rdev, ®ulator_list, list) { |
3590 | |
3591 | mutex_lock(&rdev->mutex); |
3592 | ret = suspend_prepare(rdev, state); |
3593 | mutex_unlock(&rdev->mutex); |
3594 | |
3595 | if (ret < 0) { |
3596 | rdev_err(rdev, "failed to prepare\n"); |
3597 | goto out; |
3598 | } |
3599 | } |
3600 | out: |
3601 | mutex_unlock(®ulator_list_mutex); |
3602 | return ret; |
3603 | } |
3604 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); |
3605 | |
3606 | /** |
3607 | * regulator_suspend_finish - resume regulators from system wide suspend |
3608 | * |
3609 | * Turn on regulators that might be turned off by regulator_suspend_prepare |
3610 | * and that should be turned on according to the regulators properties. |
3611 | */ |
3612 | int regulator_suspend_finish(void) |
3613 | { |
3614 | struct regulator_dev *rdev; |
3615 | int ret = 0, error; |
3616 | |
3617 | mutex_lock(®ulator_list_mutex); |
3618 | list_for_each_entry(rdev, ®ulator_list, list) { |
3619 | struct regulator_ops *ops = rdev->desc->ops; |
3620 | |
3621 | mutex_lock(&rdev->mutex); |
3622 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && |
3623 | ops->enable) { |
3624 | error = ops->enable(rdev); |
3625 | if (error) |
3626 | ret = error; |
3627 | } else { |
3628 | if (!has_full_constraints) |
3629 | goto unlock; |
3630 | if (!ops->disable) |
3631 | goto unlock; |
3632 | if (!_regulator_is_enabled(rdev)) |
3633 | goto unlock; |
3634 | |
3635 | error = ops->disable(rdev); |
3636 | if (error) |
3637 | ret = error; |
3638 | } |
3639 | unlock: |
3640 | mutex_unlock(&rdev->mutex); |
3641 | } |
3642 | mutex_unlock(®ulator_list_mutex); |
3643 | return ret; |
3644 | } |
3645 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); |
3646 | |
3647 | /** |
3648 | * regulator_has_full_constraints - the system has fully specified constraints |
3649 | * |
3650 | * Calling this function will cause the regulator API to disable all |
3651 | * regulators which have a zero use count and don't have an always_on |
3652 | * constraint in a late_initcall. |
3653 | * |
3654 | * The intention is that this will become the default behaviour in a |
3655 | * future kernel release so users are encouraged to use this facility |
3656 | * now. |
3657 | */ |
3658 | void regulator_has_full_constraints(void) |
3659 | { |
3660 | has_full_constraints = 1; |
3661 | } |
3662 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); |
3663 | |
3664 | /** |
3665 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found |
3666 | * |
3667 | * Calling this function will cause the regulator API to provide a |
3668 | * dummy regulator to consumers if no physical regulator is found, |
3669 | * allowing most consumers to proceed as though a regulator were |
3670 | * configured. This allows systems such as those with software |
3671 | * controllable regulators for the CPU core only to be brought up more |
3672 | * readily. |
3673 | */ |
3674 | void regulator_use_dummy_regulator(void) |
3675 | { |
3676 | board_wants_dummy_regulator = true; |
3677 | } |
3678 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); |
3679 | |
3680 | /** |
3681 | * rdev_get_drvdata - get rdev regulator driver data |
3682 | * @rdev: regulator |
3683 | * |
3684 | * Get rdev regulator driver private data. This call can be used in the |
3685 | * regulator driver context. |
3686 | */ |
3687 | void *rdev_get_drvdata(struct regulator_dev *rdev) |
3688 | { |
3689 | return rdev->reg_data; |
3690 | } |
3691 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); |
3692 | |
3693 | /** |
3694 | * regulator_get_drvdata - get regulator driver data |
3695 | * @regulator: regulator |
3696 | * |
3697 | * Get regulator driver private data. This call can be used in the consumer |
3698 | * driver context when non API regulator specific functions need to be called. |
3699 | */ |
3700 | void *regulator_get_drvdata(struct regulator *regulator) |
3701 | { |
3702 | return regulator->rdev->reg_data; |
3703 | } |
3704 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); |
3705 | |
3706 | /** |
3707 | * regulator_set_drvdata - set regulator driver data |
3708 | * @regulator: regulator |
3709 | * @data: data |
3710 | */ |
3711 | void regulator_set_drvdata(struct regulator *regulator, void *data) |
3712 | { |
3713 | regulator->rdev->reg_data = data; |
3714 | } |
3715 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); |
3716 | |
3717 | /** |
3718 | * regulator_get_id - get regulator ID |
3719 | * @rdev: regulator |
3720 | */ |
3721 | int rdev_get_id(struct regulator_dev *rdev) |
3722 | { |
3723 | return rdev->desc->id; |
3724 | } |
3725 | EXPORT_SYMBOL_GPL(rdev_get_id); |
3726 | |
3727 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3728 | { |
3729 | return &rdev->dev; |
3730 | } |
3731 | EXPORT_SYMBOL_GPL(rdev_get_dev); |
3732 | |
3733 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
3734 | { |
3735 | return reg_init_data->driver_data; |
3736 | } |
3737 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); |
3738 | |
3739 | #ifdef CONFIG_DEBUG_FS |
3740 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, |
3741 | size_t count, loff_t *ppos) |
3742 | { |
3743 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3744 | ssize_t len, ret = 0; |
3745 | struct regulator_map *map; |
3746 | |
3747 | if (!buf) |
3748 | return -ENOMEM; |
3749 | |
3750 | list_for_each_entry(map, ®ulator_map_list, list) { |
3751 | len = snprintf(buf + ret, PAGE_SIZE - ret, |
3752 | "%s -> %s.%s\n", |
3753 | rdev_get_name(map->regulator), map->dev_name, |
3754 | map->supply); |
3755 | if (len >= 0) |
3756 | ret += len; |
3757 | if (ret > PAGE_SIZE) { |
3758 | ret = PAGE_SIZE; |
3759 | break; |
3760 | } |
3761 | } |
3762 | |
3763 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); |
3764 | |
3765 | kfree(buf); |
3766 | |
3767 | return ret; |
3768 | } |
3769 | #endif |
3770 | |
3771 | static const struct file_operations supply_map_fops = { |
3772 | #ifdef CONFIG_DEBUG_FS |
3773 | .read = supply_map_read_file, |
3774 | .llseek = default_llseek, |
3775 | #endif |
3776 | }; |
3777 | |
3778 | static int __init regulator_init(void) |
3779 | { |
3780 | int ret; |
3781 | |
3782 | ret = class_register(®ulator_class); |
3783 | |
3784 | debugfs_root = debugfs_create_dir("regulator", NULL); |
3785 | if (!debugfs_root) |
3786 | pr_warn("regulator: Failed to create debugfs directory\n"); |
3787 | |
3788 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3789 | &supply_map_fops); |
3790 | |
3791 | regulator_dummy_init(); |
3792 | |
3793 | return ret; |
3794 | } |
3795 | |
3796 | /* init early to allow our consumers to complete system booting */ |
3797 | core_initcall(regulator_init); |
3798 | |
3799 | static int __init regulator_init_complete(void) |
3800 | { |
3801 | struct regulator_dev *rdev; |
3802 | struct regulator_ops *ops; |
3803 | struct regulation_constraints *c; |
3804 | int enabled, ret; |
3805 | |
3806 | /* |
3807 | * Since DT doesn't provide an idiomatic mechanism for |
3808 | * enabling full constraints and since it's much more natural |
3809 | * with DT to provide them just assume that a DT enabled |
3810 | * system has full constraints. |
3811 | */ |
3812 | if (of_have_populated_dt()) |
3813 | has_full_constraints = true; |
3814 | |
3815 | mutex_lock(®ulator_list_mutex); |
3816 | |
3817 | /* If we have a full configuration then disable any regulators |
3818 | * which are not in use or always_on. This will become the |
3819 | * default behaviour in the future. |
3820 | */ |
3821 | list_for_each_entry(rdev, ®ulator_list, list) { |
3822 | ops = rdev->desc->ops; |
3823 | c = rdev->constraints; |
3824 | |
3825 | if (!ops->disable || (c && c->always_on)) |
3826 | continue; |
3827 | |
3828 | mutex_lock(&rdev->mutex); |
3829 | |
3830 | if (rdev->use_count) |
3831 | goto unlock; |
3832 | |
3833 | /* If we can't read the status assume it's on. */ |
3834 | if (ops->is_enabled) |
3835 | enabled = ops->is_enabled(rdev); |
3836 | else |
3837 | enabled = 1; |
3838 | |
3839 | if (!enabled) |
3840 | goto unlock; |
3841 | |
3842 | if (has_full_constraints) { |
3843 | /* We log since this may kill the system if it |
3844 | * goes wrong. */ |
3845 | rdev_info(rdev, "disabling\n"); |
3846 | ret = ops->disable(rdev); |
3847 | if (ret != 0) { |
3848 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
3849 | } |
3850 | } else { |
3851 | /* The intention is that in future we will |
3852 | * assume that full constraints are provided |
3853 | * so warn even if we aren't going to do |
3854 | * anything here. |
3855 | */ |
3856 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
3857 | } |
3858 | |
3859 | unlock: |
3860 | mutex_unlock(&rdev->mutex); |
3861 | } |
3862 | |
3863 | mutex_unlock(®ulator_list_mutex); |
3864 | |
3865 | return 0; |
3866 | } |
3867 | late_initcall(regulator_init_complete); |
3868 |
Branches:
ben-wpan
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javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9