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Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
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> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
69511a45 | 27 | #include <linux/of.h> |
65b19ce6 | 28 | #include <linux/regmap.h> |
69511a45 | 29 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
30 | #include <linux/regulator/consumer.h> |
31 | #include <linux/regulator/driver.h> | |
32 | #include <linux/regulator/machine.h> | |
65602c32 | 33 | #include <linux/module.h> |
414c70cb | 34 | |
02fa3ec0 MB |
35 | #define CREATE_TRACE_POINTS |
36 | #include <trace/events/regulator.h> | |
37 | ||
34abbd68 MB |
38 | #include "dummy.h" |
39 | ||
7d51a0db MB |
40 | #define rdev_crit(rdev, fmt, ...) \ |
41 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
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 | ||
414c70cb LG |
51 | static DEFINE_MUTEX(regulator_list_mutex); |
52 | static LIST_HEAD(regulator_list); | |
53 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 54 | static bool has_full_constraints; |
688fe99a | 55 | static bool board_wants_dummy_regulator; |
414c70cb | 56 | |
1130e5b3 | 57 | static struct dentry *debugfs_root; |
1130e5b3 | 58 | |
8dc5390d | 59 | /* |
414c70cb LG |
60 | * struct regulator_map |
61 | * | |
62 | * Used to provide symbolic supply names to devices. | |
63 | */ | |
64 | struct regulator_map { | |
65 | struct list_head list; | |
40f9244f | 66 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 67 | const char *supply; |
a5766f11 | 68 | struct regulator_dev *regulator; |
414c70cb LG |
69 | }; |
70 | ||
414c70cb LG |
71 | /* |
72 | * struct regulator | |
73 | * | |
74 | * One for each consumer device. | |
75 | */ | |
76 | struct regulator { | |
77 | struct device *dev; | |
78 | struct list_head list; | |
6492bc1b | 79 | unsigned int always_on:1; |
f59c8f9f | 80 | unsigned int bypass:1; |
414c70cb LG |
81 | int uA_load; |
82 | int min_uV; | |
83 | int max_uV; | |
414c70cb LG |
84 | char *supply_name; |
85 | struct device_attribute dev_attr; | |
86 | struct regulator_dev *rdev; | |
5de70519 | 87 | struct dentry *debugfs; |
414c70cb LG |
88 | }; |
89 | ||
90 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 91 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
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); | |
75790251 MB |
97 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
98 | int min_uV, int max_uV); | |
3801b86a MB |
99 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
100 | struct device *dev, | |
101 | const char *supply_name); | |
414c70cb | 102 | |
1083c393 MB |
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 | ||
69511a45 RN |
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) { | |
16fbcc3b | 133 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
134 | prop_name, dev->of_node->full_name); |
135 | return NULL; | |
136 | } | |
137 | return regnode; | |
138 | } | |
139 | ||
6492bc1b MB |
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 | ||
414c70cb LG |
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) { | |
5da84fd9 | 158 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
159 | return -ENODEV; |
160 | } | |
161 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 162 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
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 | ||
89f425ed MB |
171 | if (*min_uV > *max_uV) { |
172 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 173 | *min_uV, *max_uV); |
414c70cb | 174 | return -EINVAL; |
89f425ed | 175 | } |
414c70cb LG |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
05fda3b1 TP |
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) { | |
4aa922c0 MB |
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 | ||
05fda3b1 TP |
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 | return -EINVAL; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
414c70cb LG |
208 | /* current constraint check */ |
209 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
210 | int *min_uA, int *max_uA) | |
211 | { | |
212 | BUG_ON(*min_uA > *max_uA); | |
213 | ||
214 | if (!rdev->constraints) { | |
5da84fd9 | 215 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
216 | return -ENODEV; |
217 | } | |
218 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 219 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
220 | return -EPERM; |
221 | } | |
222 | ||
223 | if (*max_uA > rdev->constraints->max_uA) | |
224 | *max_uA = rdev->constraints->max_uA; | |
225 | if (*min_uA < rdev->constraints->min_uA) | |
226 | *min_uA = rdev->constraints->min_uA; | |
227 | ||
89f425ed MB |
228 | if (*min_uA > *max_uA) { |
229 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 230 | *min_uA, *max_uA); |
414c70cb | 231 | return -EINVAL; |
89f425ed | 232 | } |
414c70cb LG |
233 | |
234 | return 0; | |
235 | } | |
236 | ||
237 | /* operating mode constraint check */ | |
2c608234 | 238 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 239 | { |
2c608234 | 240 | switch (*mode) { |
e573520b DB |
241 | case REGULATOR_MODE_FAST: |
242 | case REGULATOR_MODE_NORMAL: | |
243 | case REGULATOR_MODE_IDLE: | |
244 | case REGULATOR_MODE_STANDBY: | |
245 | break; | |
246 | default: | |
89f425ed | 247 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
248 | return -EINVAL; |
249 | } | |
250 | ||
414c70cb | 251 | if (!rdev->constraints) { |
5da84fd9 | 252 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
253 | return -ENODEV; |
254 | } | |
255 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 256 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
257 | return -EPERM; |
258 | } | |
2c608234 MB |
259 | |
260 | /* The modes are bitmasks, the most power hungry modes having | |
261 | * the lowest values. If the requested mode isn't supported | |
262 | * try higher modes. */ | |
263 | while (*mode) { | |
264 | if (rdev->constraints->valid_modes_mask & *mode) | |
265 | return 0; | |
266 | *mode /= 2; | |
414c70cb | 267 | } |
2c608234 MB |
268 | |
269 | return -EINVAL; | |
414c70cb LG |
270 | } |
271 | ||
272 | /* dynamic regulator mode switching constraint check */ | |
273 | static int regulator_check_drms(struct regulator_dev *rdev) | |
274 | { | |
275 | if (!rdev->constraints) { | |
5da84fd9 | 276 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
277 | return -ENODEV; |
278 | } | |
279 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 280 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
281 | return -EPERM; |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
414c70cb LG |
286 | static ssize_t regulator_uV_show(struct device *dev, |
287 | struct device_attribute *attr, char *buf) | |
288 | { | |
a5766f11 | 289 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
290 | ssize_t ret; |
291 | ||
292 | mutex_lock(&rdev->mutex); | |
293 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
294 | mutex_unlock(&rdev->mutex); | |
295 | ||
296 | return ret; | |
297 | } | |
7ad68e2f | 298 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
299 | |
300 | static ssize_t regulator_uA_show(struct device *dev, | |
301 | struct device_attribute *attr, char *buf) | |
302 | { | |
a5766f11 | 303 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
304 | |
305 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
306 | } | |
7ad68e2f | 307 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 308 | |
bc558a60 MB |
309 | static ssize_t regulator_name_show(struct device *dev, |
310 | struct device_attribute *attr, char *buf) | |
311 | { | |
312 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 313 | |
1083c393 | 314 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
315 | } |
316 | ||
4fca9545 | 317 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 318 | { |
414c70cb LG |
319 | switch (mode) { |
320 | case REGULATOR_MODE_FAST: | |
321 | return sprintf(buf, "fast\n"); | |
322 | case REGULATOR_MODE_NORMAL: | |
323 | return sprintf(buf, "normal\n"); | |
324 | case REGULATOR_MODE_IDLE: | |
325 | return sprintf(buf, "idle\n"); | |
326 | case REGULATOR_MODE_STANDBY: | |
327 | return sprintf(buf, "standby\n"); | |
328 | } | |
329 | return sprintf(buf, "unknown\n"); | |
330 | } | |
331 | ||
4fca9545 DB |
332 | static ssize_t regulator_opmode_show(struct device *dev, |
333 | struct device_attribute *attr, char *buf) | |
414c70cb | 334 | { |
a5766f11 | 335 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 336 | |
4fca9545 DB |
337 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
338 | } | |
7ad68e2f | 339 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
340 | |
341 | static ssize_t regulator_print_state(char *buf, int state) | |
342 | { | |
414c70cb LG |
343 | if (state > 0) |
344 | return sprintf(buf, "enabled\n"); | |
345 | else if (state == 0) | |
346 | return sprintf(buf, "disabled\n"); | |
347 | else | |
348 | return sprintf(buf, "unknown\n"); | |
349 | } | |
350 | ||
4fca9545 DB |
351 | static ssize_t regulator_state_show(struct device *dev, |
352 | struct device_attribute *attr, char *buf) | |
353 | { | |
354 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
355 | ssize_t ret; |
356 | ||
357 | mutex_lock(&rdev->mutex); | |
358 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
359 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 360 | |
9332546f | 361 | return ret; |
4fca9545 | 362 | } |
7ad68e2f | 363 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 364 | |
853116a1 DB |
365 | static ssize_t regulator_status_show(struct device *dev, |
366 | struct device_attribute *attr, char *buf) | |
367 | { | |
368 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
369 | int status; | |
370 | char *label; | |
371 | ||
372 | status = rdev->desc->ops->get_status(rdev); | |
373 | if (status < 0) | |
374 | return status; | |
375 | ||
376 | switch (status) { | |
377 | case REGULATOR_STATUS_OFF: | |
378 | label = "off"; | |
379 | break; | |
380 | case REGULATOR_STATUS_ON: | |
381 | label = "on"; | |
382 | break; | |
383 | case REGULATOR_STATUS_ERROR: | |
384 | label = "error"; | |
385 | break; | |
386 | case REGULATOR_STATUS_FAST: | |
387 | label = "fast"; | |
388 | break; | |
389 | case REGULATOR_STATUS_NORMAL: | |
390 | label = "normal"; | |
391 | break; | |
392 | case REGULATOR_STATUS_IDLE: | |
393 | label = "idle"; | |
394 | break; | |
395 | case REGULATOR_STATUS_STANDBY: | |
396 | label = "standby"; | |
397 | break; | |
f59c8f9f MB |
398 | case REGULATOR_STATUS_BYPASS: |
399 | label = "bypass"; | |
400 | break; | |
1beaf762 KG |
401 | case REGULATOR_STATUS_UNDEFINED: |
402 | label = "undefined"; | |
403 | break; | |
853116a1 DB |
404 | default: |
405 | return -ERANGE; | |
406 | } | |
407 | ||
408 | return sprintf(buf, "%s\n", label); | |
409 | } | |
410 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
411 | ||
414c70cb LG |
412 | static ssize_t regulator_min_uA_show(struct device *dev, |
413 | struct device_attribute *attr, char *buf) | |
414 | { | |
a5766f11 | 415 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
416 | |
417 | if (!rdev->constraints) | |
418 | return sprintf(buf, "constraint not defined\n"); | |
419 | ||
420 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
421 | } | |
7ad68e2f | 422 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
423 | |
424 | static ssize_t regulator_max_uA_show(struct device *dev, | |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
a5766f11 | 427 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
428 | |
429 | if (!rdev->constraints) | |
430 | return sprintf(buf, "constraint not defined\n"); | |
431 | ||
432 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
433 | } | |
7ad68e2f | 434 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
435 | |
436 | static ssize_t regulator_min_uV_show(struct device *dev, | |
437 | struct device_attribute *attr, char *buf) | |
438 | { | |
a5766f11 | 439 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
440 | |
441 | if (!rdev->constraints) | |
442 | return sprintf(buf, "constraint not defined\n"); | |
443 | ||
444 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
445 | } | |
7ad68e2f | 446 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
447 | |
448 | static ssize_t regulator_max_uV_show(struct device *dev, | |
449 | struct device_attribute *attr, char *buf) | |
450 | { | |
a5766f11 | 451 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
452 | |
453 | if (!rdev->constraints) | |
454 | return sprintf(buf, "constraint not defined\n"); | |
455 | ||
456 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
457 | } | |
7ad68e2f | 458 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
459 | |
460 | static ssize_t regulator_total_uA_show(struct device *dev, | |
461 | struct device_attribute *attr, char *buf) | |
462 | { | |
a5766f11 | 463 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
464 | struct regulator *regulator; |
465 | int uA = 0; | |
466 | ||
467 | mutex_lock(&rdev->mutex); | |
468 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 469 | uA += regulator->uA_load; |
414c70cb LG |
470 | mutex_unlock(&rdev->mutex); |
471 | return sprintf(buf, "%d\n", uA); | |
472 | } | |
7ad68e2f | 473 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
474 | |
475 | static ssize_t regulator_num_users_show(struct device *dev, | |
476 | struct device_attribute *attr, char *buf) | |
477 | { | |
a5766f11 | 478 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
479 | return sprintf(buf, "%d\n", rdev->use_count); |
480 | } | |
481 | ||
482 | static ssize_t regulator_type_show(struct device *dev, | |
483 | struct device_attribute *attr, char *buf) | |
484 | { | |
a5766f11 | 485 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
486 | |
487 | switch (rdev->desc->type) { | |
488 | case REGULATOR_VOLTAGE: | |
489 | return sprintf(buf, "voltage\n"); | |
490 | case REGULATOR_CURRENT: | |
491 | return sprintf(buf, "current\n"); | |
492 | } | |
493 | return sprintf(buf, "unknown\n"); | |
494 | } | |
495 | ||
496 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
497 | struct device_attribute *attr, char *buf) | |
498 | { | |
a5766f11 | 499 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 500 | |
414c70cb LG |
501 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
502 | } | |
7ad68e2f DB |
503 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
504 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
505 | |
506 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
507 | struct device_attribute *attr, char *buf) | |
508 | { | |
a5766f11 | 509 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 510 | |
414c70cb LG |
511 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
512 | } | |
7ad68e2f DB |
513 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
514 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
515 | |
516 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
517 | struct device_attribute *attr, char *buf) | |
518 | { | |
a5766f11 | 519 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 520 | |
414c70cb LG |
521 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
522 | } | |
7ad68e2f DB |
523 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
524 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 525 | |
414c70cb LG |
526 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
527 | struct device_attribute *attr, char *buf) | |
528 | { | |
a5766f11 | 529 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 530 | |
4fca9545 DB |
531 | return regulator_print_opmode(buf, |
532 | rdev->constraints->state_mem.mode); | |
414c70cb | 533 | } |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
535 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
4fca9545 DB |
542 | return regulator_print_opmode(buf, |
543 | rdev->constraints->state_disk.mode); | |
414c70cb | 544 | } |
7ad68e2f DB |
545 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
546 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
547 | |
548 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
549 | struct device_attribute *attr, char *buf) | |
550 | { | |
a5766f11 | 551 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 552 | |
4fca9545 DB |
553 | return regulator_print_opmode(buf, |
554 | rdev->constraints->state_standby.mode); | |
414c70cb | 555 | } |
7ad68e2f DB |
556 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
557 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
558 | |
559 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
560 | struct device_attribute *attr, char *buf) | |
561 | { | |
a5766f11 | 562 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 563 | |
4fca9545 DB |
564 | return regulator_print_state(buf, |
565 | rdev->constraints->state_mem.enabled); | |
414c70cb | 566 | } |
7ad68e2f DB |
567 | static DEVICE_ATTR(suspend_mem_state, 0444, |
568 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
569 | |
570 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
571 | struct device_attribute *attr, char *buf) | |
572 | { | |
a5766f11 | 573 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 574 | |
4fca9545 DB |
575 | return regulator_print_state(buf, |
576 | rdev->constraints->state_disk.enabled); | |
414c70cb | 577 | } |
7ad68e2f DB |
578 | static DEVICE_ATTR(suspend_disk_state, 0444, |
579 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
580 | |
581 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
582 | struct device_attribute *attr, char *buf) | |
583 | { | |
a5766f11 | 584 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 585 | |
4fca9545 DB |
586 | return regulator_print_state(buf, |
587 | rdev->constraints->state_standby.enabled); | |
414c70cb | 588 | } |
7ad68e2f DB |
589 | static DEVICE_ATTR(suspend_standby_state, 0444, |
590 | regulator_suspend_standby_state_show, NULL); | |
591 | ||
f59c8f9f MB |
592 | static ssize_t regulator_bypass_show(struct device *dev, |
593 | struct device_attribute *attr, char *buf) | |
594 | { | |
595 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
596 | const char *report; | |
597 | bool bypass; | |
598 | int ret; | |
599 | ||
600 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
601 | ||
602 | if (ret != 0) | |
603 | report = "unknown"; | |
604 | else if (bypass) | |
605 | report = "enabled"; | |
606 | else | |
607 | report = "disabled"; | |
608 | ||
609 | return sprintf(buf, "%s\n", report); | |
610 | } | |
611 | static DEVICE_ATTR(bypass, 0444, | |
612 | regulator_bypass_show, NULL); | |
bc558a60 | 613 | |
7ad68e2f DB |
614 | /* |
615 | * These are the only attributes are present for all regulators. | |
616 | * Other attributes are a function of regulator functionality. | |
617 | */ | |
414c70cb | 618 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 619 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
620 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
621 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
622 | __ATTR_NULL, |
623 | }; | |
624 | ||
625 | static void regulator_dev_release(struct device *dev) | |
626 | { | |
a5766f11 | 627 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
628 | kfree(rdev); |
629 | } | |
630 | ||
631 | static struct class regulator_class = { | |
632 | .name = "regulator", | |
633 | .dev_release = regulator_dev_release, | |
634 | .dev_attrs = regulator_dev_attrs, | |
635 | }; | |
636 | ||
637 | /* Calculate the new optimum regulator operating mode based on the new total | |
638 | * consumer load. All locks held by caller */ | |
639 | static void drms_uA_update(struct regulator_dev *rdev) | |
640 | { | |
641 | struct regulator *sibling; | |
642 | int current_uA = 0, output_uV, input_uV, err; | |
643 | unsigned int mode; | |
644 | ||
645 | err = regulator_check_drms(rdev); | |
646 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
647 | (!rdev->desc->ops->get_voltage && |
648 | !rdev->desc->ops->get_voltage_sel) || | |
649 | !rdev->desc->ops->set_mode) | |
036de8ef | 650 | return; |
414c70cb LG |
651 | |
652 | /* get output voltage */ | |
1bf5a1f8 | 653 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
654 | if (output_uV <= 0) |
655 | return; | |
656 | ||
657 | /* get input voltage */ | |
1bf5a1f8 MB |
658 | input_uV = 0; |
659 | if (rdev->supply) | |
3f24f5ad | 660 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 661 | if (input_uV <= 0) |
414c70cb LG |
662 | input_uV = rdev->constraints->input_uV; |
663 | if (input_uV <= 0) | |
664 | return; | |
665 | ||
666 | /* calc total requested load */ | |
667 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 668 | current_uA += sibling->uA_load; |
414c70cb LG |
669 | |
670 | /* now get the optimum mode for our new total regulator load */ | |
671 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
672 | output_uV, current_uA); | |
673 | ||
674 | /* check the new mode is allowed */ | |
2c608234 | 675 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
676 | if (err == 0) |
677 | rdev->desc->ops->set_mode(rdev, mode); | |
678 | } | |
679 | ||
680 | static int suspend_set_state(struct regulator_dev *rdev, | |
681 | struct regulator_state *rstate) | |
682 | { | |
683 | int ret = 0; | |
638f85c5 MB |
684 | |
685 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
686 | * only warn if the driver implements set_suspend_voltage or |
687 | * set_suspend_mode callback. | |
638f85c5 MB |
688 | */ |
689 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
690 | if (rdev->desc->ops->set_suspend_voltage || |
691 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 692 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
693 | return 0; |
694 | } | |
695 | ||
696 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 697 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
698 | return -EINVAL; |
699 | } | |
414c70cb | 700 | |
8ac0e95d | 701 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 702 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 703 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 704 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
705 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
706 | ret = 0; | |
707 | ||
414c70cb | 708 | if (ret < 0) { |
5da84fd9 | 709 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
710 | return ret; |
711 | } | |
712 | ||
713 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
714 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
715 | if (ret < 0) { | |
5da84fd9 | 716 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
717 | return ret; |
718 | } | |
719 | } | |
720 | ||
721 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
722 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
723 | if (ret < 0) { | |
5da84fd9 | 724 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
725 | return ret; |
726 | } | |
727 | } | |
728 | return ret; | |
729 | } | |
730 | ||
731 | /* locks held by caller */ | |
732 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
733 | { | |
734 | if (!rdev->constraints) | |
735 | return -EINVAL; | |
736 | ||
737 | switch (state) { | |
738 | case PM_SUSPEND_STANDBY: | |
739 | return suspend_set_state(rdev, | |
740 | &rdev->constraints->state_standby); | |
741 | case PM_SUSPEND_MEM: | |
742 | return suspend_set_state(rdev, | |
743 | &rdev->constraints->state_mem); | |
744 | case PM_SUSPEND_MAX: | |
745 | return suspend_set_state(rdev, | |
746 | &rdev->constraints->state_disk); | |
747 | default: | |
748 | return -EINVAL; | |
749 | } | |
750 | } | |
751 | ||
752 | static void print_constraints(struct regulator_dev *rdev) | |
753 | { | |
754 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 755 | char buf[80] = ""; |
8f031b48 MB |
756 | int count = 0; |
757 | int ret; | |
414c70cb | 758 | |
8f031b48 | 759 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 760 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
761 | count += sprintf(buf + count, "%d mV ", |
762 | constraints->min_uV / 1000); | |
414c70cb | 763 | else |
8f031b48 MB |
764 | count += sprintf(buf + count, "%d <--> %d mV ", |
765 | constraints->min_uV / 1000, | |
766 | constraints->max_uV / 1000); | |
767 | } | |
768 | ||
769 | if (!constraints->min_uV || | |
770 | constraints->min_uV != constraints->max_uV) { | |
771 | ret = _regulator_get_voltage(rdev); | |
772 | if (ret > 0) | |
773 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
774 | } | |
775 | ||
bf5892a8 MB |
776 | if (constraints->uV_offset) |
777 | count += sprintf(buf, "%dmV offset ", | |
778 | constraints->uV_offset / 1000); | |
779 | ||
8f031b48 | 780 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 781 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
782 | count += sprintf(buf + count, "%d mA ", |
783 | constraints->min_uA / 1000); | |
414c70cb | 784 | else |
8f031b48 MB |
785 | count += sprintf(buf + count, "%d <--> %d mA ", |
786 | constraints->min_uA / 1000, | |
787 | constraints->max_uA / 1000); | |
788 | } | |
789 | ||
790 | if (!constraints->min_uA || | |
791 | constraints->min_uA != constraints->max_uA) { | |
792 | ret = _regulator_get_current_limit(rdev); | |
793 | if (ret > 0) | |
e4a6376b | 794 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 795 | } |
8f031b48 | 796 | |
414c70cb LG |
797 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
798 | count += sprintf(buf + count, "fast "); | |
799 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
800 | count += sprintf(buf + count, "normal "); | |
801 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
802 | count += sprintf(buf + count, "idle "); | |
803 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
804 | count += sprintf(buf + count, "standby"); | |
805 | ||
215b8b05 UKK |
806 | if (!count) |
807 | sprintf(buf, "no parameters"); | |
808 | ||
13ce29f8 | 809 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
810 | |
811 | if ((constraints->min_uV != constraints->max_uV) && | |
812 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
813 | rdev_warn(rdev, | |
814 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
815 | } |
816 | ||
e79055d6 | 817 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 818 | struct regulation_constraints *constraints) |
a5766f11 | 819 | { |
e5fda26c | 820 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
821 | int ret; |
822 | ||
823 | /* do we need to apply the constraint voltage */ | |
824 | if (rdev->constraints->apply_uV && | |
75790251 MB |
825 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
826 | ret = _regulator_do_set_voltage(rdev, | |
827 | rdev->constraints->min_uV, | |
828 | rdev->constraints->max_uV); | |
829 | if (ret < 0) { | |
830 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
831 | rdev->constraints->min_uV); | |
75790251 MB |
832 | return ret; |
833 | } | |
af5866c9 | 834 | } |
e06f5b4f | 835 | |
4367cfdc DB |
836 | /* constrain machine-level voltage specs to fit |
837 | * the actual range supported by this regulator. | |
838 | */ | |
839 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
840 | int count = rdev->desc->n_voltages; | |
841 | int i; | |
842 | int min_uV = INT_MAX; | |
843 | int max_uV = INT_MIN; | |
844 | int cmin = constraints->min_uV; | |
845 | int cmax = constraints->max_uV; | |
846 | ||
3e590918 MB |
847 | /* it's safe to autoconfigure fixed-voltage supplies |
848 | and the constraints are used by list_voltage. */ | |
4367cfdc | 849 | if (count == 1 && !cmin) { |
3e590918 | 850 | cmin = 1; |
4367cfdc | 851 | cmax = INT_MAX; |
3e590918 MB |
852 | constraints->min_uV = cmin; |
853 | constraints->max_uV = cmax; | |
4367cfdc DB |
854 | } |
855 | ||
3e2b9abd MB |
856 | /* voltage constraints are optional */ |
857 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 858 | return 0; |
3e2b9abd | 859 | |
4367cfdc | 860 | /* else require explicit machine-level constraints */ |
3e2b9abd | 861 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 862 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 863 | return -EINVAL; |
4367cfdc DB |
864 | } |
865 | ||
866 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
867 | for (i = 0; i < count; i++) { | |
868 | int value; | |
869 | ||
870 | value = ops->list_voltage(rdev, i); | |
871 | if (value <= 0) | |
872 | continue; | |
873 | ||
874 | /* maybe adjust [min_uV..max_uV] */ | |
875 | if (value >= cmin && value < min_uV) | |
876 | min_uV = value; | |
877 | if (value <= cmax && value > max_uV) | |
878 | max_uV = value; | |
879 | } | |
880 | ||
881 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
882 | if (max_uV < min_uV) { | |
5da84fd9 | 883 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 884 | return -EINVAL; |
4367cfdc DB |
885 | } |
886 | ||
887 | /* use regulator's subset of machine constraints */ | |
888 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
889 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
890 | constraints->min_uV, min_uV); | |
4367cfdc DB |
891 | constraints->min_uV = min_uV; |
892 | } | |
893 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
894 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
895 | constraints->max_uV, max_uV); | |
4367cfdc DB |
896 | constraints->max_uV = max_uV; |
897 | } | |
898 | } | |
899 | ||
e79055d6 MB |
900 | return 0; |
901 | } | |
902 | ||
903 | /** | |
904 | * set_machine_constraints - sets regulator constraints | |
905 | * @rdev: regulator source | |
906 | * @constraints: constraints to apply | |
907 | * | |
908 | * Allows platform initialisation code to define and constrain | |
909 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
910 | * Constraints *must* be set by platform code in order for some | |
911 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
912 | * set_mode. | |
913 | */ | |
914 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 915 | const struct regulation_constraints *constraints) |
e79055d6 MB |
916 | { |
917 | int ret = 0; | |
e79055d6 MB |
918 | struct regulator_ops *ops = rdev->desc->ops; |
919 | ||
9a8f5e07 MB |
920 | if (constraints) |
921 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
922 | GFP_KERNEL); | |
923 | else | |
924 | rdev->constraints = kzalloc(sizeof(*constraints), | |
925 | GFP_KERNEL); | |
f8c12fe3 MB |
926 | if (!rdev->constraints) |
927 | return -ENOMEM; | |
af5866c9 | 928 | |
f8c12fe3 | 929 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
930 | if (ret != 0) |
931 | goto out; | |
932 | ||
a5766f11 | 933 | /* do we need to setup our suspend state */ |
9a8f5e07 | 934 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 935 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 936 | if (ret < 0) { |
5da84fd9 | 937 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
938 | goto out; |
939 | } | |
940 | } | |
a5766f11 | 941 | |
9a8f5e07 | 942 | if (rdev->constraints->initial_mode) { |
a308466c | 943 | if (!ops->set_mode) { |
5da84fd9 | 944 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
945 | ret = -EINVAL; |
946 | goto out; | |
947 | } | |
948 | ||
f8c12fe3 | 949 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 950 | if (ret < 0) { |
5da84fd9 | 951 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
952 | goto out; |
953 | } | |
954 | } | |
955 | ||
cacf90f2 MB |
956 | /* If the constraints say the regulator should be on at this point |
957 | * and we have control then make sure it is enabled. | |
958 | */ | |
f8c12fe3 MB |
959 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
960 | ops->enable) { | |
e5fda26c MB |
961 | ret = ops->enable(rdev); |
962 | if (ret < 0) { | |
5da84fd9 | 963 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
964 | goto out; |
965 | } | |
966 | } | |
967 | ||
6f0b2c69 YSB |
968 | if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { |
969 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); | |
970 | if (ret < 0) { | |
971 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
972 | goto out; | |
973 | } | |
974 | } | |
975 | ||
a5766f11 | 976 | print_constraints(rdev); |
1a6958e7 | 977 | return 0; |
a5766f11 | 978 | out: |
1a6958e7 AL |
979 | kfree(rdev->constraints); |
980 | rdev->constraints = NULL; | |
a5766f11 LG |
981 | return ret; |
982 | } | |
983 | ||
984 | /** | |
985 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
986 | * @rdev: regulator name |
987 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
988 | * |
989 | * Called by platform initialisation code to set the supply regulator for this | |
990 | * regulator. This ensures that a regulators supply will also be enabled by the | |
991 | * core if it's child is enabled. | |
992 | */ | |
993 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 994 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
995 | { |
996 | int err; | |
997 | ||
3801b86a MB |
998 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
999 | ||
1000 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1001 | if (rdev->supply == NULL) { |
1002 | err = -ENOMEM; | |
3801b86a | 1003 | return err; |
a5766f11 | 1004 | } |
57ad526a | 1005 | supply_rdev->open_count++; |
3801b86a MB |
1006 | |
1007 | return 0; | |
a5766f11 LG |
1008 | } |
1009 | ||
1010 | /** | |
06c63f93 | 1011 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1012 | * @rdev: regulator source |
40f9244f | 1013 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1014 | * @supply: symbolic name for supply |
a5766f11 LG |
1015 | * |
1016 | * Allows platform initialisation code to map physical regulator | |
1017 | * sources to symbolic names for supplies for use by devices. Devices | |
1018 | * should use these symbolic names to request regulators, avoiding the | |
1019 | * need to provide board-specific regulator names as platform data. | |
1020 | */ | |
1021 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1022 | const char *consumer_dev_name, |
1023 | const char *supply) | |
a5766f11 LG |
1024 | { |
1025 | struct regulator_map *node; | |
9ed2099e | 1026 | int has_dev; |
a5766f11 LG |
1027 | |
1028 | if (supply == NULL) | |
1029 | return -EINVAL; | |
1030 | ||
9ed2099e MB |
1031 | if (consumer_dev_name != NULL) |
1032 | has_dev = 1; | |
1033 | else | |
1034 | has_dev = 0; | |
1035 | ||
6001e13c | 1036 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1037 | if (node->dev_name && consumer_dev_name) { |
1038 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1039 | continue; | |
1040 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1041 | continue; |
23b5cc2a JN |
1042 | } |
1043 | ||
6001e13c DB |
1044 | if (strcmp(node->supply, supply) != 0) |
1045 | continue; | |
1046 | ||
737f360d MB |
1047 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1048 | consumer_dev_name, | |
1049 | dev_name(&node->regulator->dev), | |
1050 | node->regulator->desc->name, | |
1051 | supply, | |
1052 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1053 | return -EBUSY; |
1054 | } | |
1055 | ||
9ed2099e | 1056 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1057 | if (node == NULL) |
1058 | return -ENOMEM; | |
1059 | ||
1060 | node->regulator = rdev; | |
a5766f11 LG |
1061 | node->supply = supply; |
1062 | ||
9ed2099e MB |
1063 | if (has_dev) { |
1064 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1065 | if (node->dev_name == NULL) { | |
1066 | kfree(node); | |
1067 | return -ENOMEM; | |
1068 | } | |
40f9244f MB |
1069 | } |
1070 | ||
a5766f11 LG |
1071 | list_add(&node->list, ®ulator_map_list); |
1072 | return 0; | |
1073 | } | |
1074 | ||
0f1d747b MR |
1075 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1076 | { | |
1077 | struct regulator_map *node, *n; | |
1078 | ||
1079 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1080 | if (rdev == node->regulator) { | |
1081 | list_del(&node->list); | |
40f9244f | 1082 | kfree(node->dev_name); |
0f1d747b | 1083 | kfree(node); |
0f1d747b MR |
1084 | } |
1085 | } | |
1086 | } | |
1087 | ||
f5726ae3 | 1088 | #define REG_STR_SIZE 64 |
414c70cb LG |
1089 | |
1090 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1091 | struct device *dev, | |
1092 | const char *supply_name) | |
1093 | { | |
1094 | struct regulator *regulator; | |
1095 | char buf[REG_STR_SIZE]; | |
1096 | int err, size; | |
1097 | ||
1098 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1099 | if (regulator == NULL) | |
1100 | return NULL; | |
1101 | ||
1102 | mutex_lock(&rdev->mutex); | |
1103 | regulator->rdev = rdev; | |
1104 | list_add(®ulator->list, &rdev->consumer_list); | |
1105 | ||
1106 | if (dev) { | |
e2c98eaf SG |
1107 | regulator->dev = dev; |
1108 | ||
222cc7b1 | 1109 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1110 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1111 | dev->kobj.name, supply_name); | |
1112 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1113 | goto overflow_err; |
414c70cb LG |
1114 | |
1115 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1116 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1117 | goto overflow_err; |
414c70cb LG |
1118 | |
1119 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1120 | buf); | |
1121 | if (err) { | |
5da84fd9 JP |
1122 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1123 | dev->kobj.name, err); | |
222cc7b1 | 1124 | /* non-fatal */ |
414c70cb | 1125 | } |
5de70519 MB |
1126 | } else { |
1127 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1128 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1129 | goto overflow_err; |
5de70519 MB |
1130 | } |
1131 | ||
5de70519 MB |
1132 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1133 | rdev->debugfs); | |
24751434 | 1134 | if (!regulator->debugfs) { |
5de70519 | 1135 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1136 | } else { |
1137 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1138 | ®ulator->uA_load); | |
1139 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1140 | ®ulator->min_uV); | |
1141 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1142 | ®ulator->max_uV); | |
414c70cb | 1143 | } |
5de70519 | 1144 | |
6492bc1b MB |
1145 | /* |
1146 | * Check now if the regulator is an always on regulator - if | |
1147 | * it is then we don't need to do nearly so much work for | |
1148 | * enable/disable calls. | |
1149 | */ | |
1150 | if (!_regulator_can_change_status(rdev) && | |
1151 | _regulator_is_enabled(rdev)) | |
1152 | regulator->always_on = true; | |
1153 | ||
414c70cb LG |
1154 | mutex_unlock(&rdev->mutex); |
1155 | return regulator; | |
414c70cb LG |
1156 | overflow_err: |
1157 | list_del(®ulator->list); | |
1158 | kfree(regulator); | |
1159 | mutex_unlock(&rdev->mutex); | |
1160 | return NULL; | |
1161 | } | |
1162 | ||
31aae2be MB |
1163 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1164 | { | |
1165 | if (!rdev->desc->ops->enable_time) | |
79511ed3 | 1166 | return rdev->desc->enable_time; |
31aae2be MB |
1167 | return rdev->desc->ops->enable_time(rdev); |
1168 | } | |
1169 | ||
69511a45 | 1170 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1171 | const char *supply, |
1172 | int *ret) | |
69511a45 RN |
1173 | { |
1174 | struct regulator_dev *r; | |
1175 | struct device_node *node; | |
576ca436 MB |
1176 | struct regulator_map *map; |
1177 | const char *devname = NULL; | |
69511a45 RN |
1178 | |
1179 | /* first do a dt based lookup */ | |
1180 | if (dev && dev->of_node) { | |
1181 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1182 | if (node) { |
69511a45 RN |
1183 | list_for_each_entry(r, ®ulator_list, list) |
1184 | if (r->dev.parent && | |
1185 | node == r->dev.of_node) | |
1186 | return r; | |
6d191a5f MB |
1187 | } else { |
1188 | /* | |
1189 | * If we couldn't even get the node then it's | |
1190 | * not just that the device didn't register | |
1191 | * yet, there's no node and we'll never | |
1192 | * succeed. | |
1193 | */ | |
1194 | *ret = -ENODEV; | |
1195 | } | |
69511a45 RN |
1196 | } |
1197 | ||
1198 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1199 | if (dev) |
1200 | devname = dev_name(dev); | |
1201 | ||
69511a45 RN |
1202 | list_for_each_entry(r, ®ulator_list, list) |
1203 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1204 | return r; | |
1205 | ||
576ca436 MB |
1206 | list_for_each_entry(map, ®ulator_map_list, list) { |
1207 | /* If the mapping has a device set up it must match */ | |
1208 | if (map->dev_name && | |
1209 | (!devname || strcmp(map->dev_name, devname))) | |
1210 | continue; | |
1211 | ||
1212 | if (strcmp(map->supply, supply) == 0) | |
1213 | return map->regulator; | |
1214 | } | |
1215 | ||
1216 | ||
69511a45 RN |
1217 | return NULL; |
1218 | } | |
1219 | ||
5ffbd136 MB |
1220 | /* Internal regulator request function */ |
1221 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1222 | int exclusive) | |
414c70cb LG |
1223 | { |
1224 | struct regulator_dev *rdev; | |
04bf3011 | 1225 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1226 | const char *devname = NULL; |
5ffbd136 | 1227 | int ret; |
414c70cb LG |
1228 | |
1229 | if (id == NULL) { | |
5da84fd9 | 1230 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1231 | return regulator; |
1232 | } | |
1233 | ||
40f9244f MB |
1234 | if (dev) |
1235 | devname = dev_name(dev); | |
1236 | ||
414c70cb LG |
1237 | mutex_lock(®ulator_list_mutex); |
1238 | ||
6d191a5f | 1239 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1240 | if (rdev) |
1241 | goto found; | |
1242 | ||
688fe99a MB |
1243 | if (board_wants_dummy_regulator) { |
1244 | rdev = dummy_regulator_rdev; | |
1245 | goto found; | |
1246 | } | |
1247 | ||
34abbd68 MB |
1248 | #ifdef CONFIG_REGULATOR_DUMMY |
1249 | if (!devname) | |
1250 | devname = "deviceless"; | |
1251 | ||
1252 | /* If the board didn't flag that it was fully constrained then | |
1253 | * substitute in a dummy regulator so consumers can continue. | |
1254 | */ | |
1255 | if (!has_full_constraints) { | |
5da84fd9 JP |
1256 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1257 | devname, id); | |
34abbd68 MB |
1258 | rdev = dummy_regulator_rdev; |
1259 | goto found; | |
1260 | } | |
1261 | #endif | |
1262 | ||
414c70cb LG |
1263 | mutex_unlock(®ulator_list_mutex); |
1264 | return regulator; | |
1265 | ||
1266 | found: | |
5ffbd136 MB |
1267 | if (rdev->exclusive) { |
1268 | regulator = ERR_PTR(-EPERM); | |
1269 | goto out; | |
1270 | } | |
1271 | ||
1272 | if (exclusive && rdev->open_count) { | |
1273 | regulator = ERR_PTR(-EBUSY); | |
1274 | goto out; | |
1275 | } | |
1276 | ||
a5766f11 LG |
1277 | if (!try_module_get(rdev->owner)) |
1278 | goto out; | |
1279 | ||
414c70cb LG |
1280 | regulator = create_regulator(rdev, dev, id); |
1281 | if (regulator == NULL) { | |
1282 | regulator = ERR_PTR(-ENOMEM); | |
1283 | module_put(rdev->owner); | |
bcda4321 | 1284 | goto out; |
414c70cb LG |
1285 | } |
1286 | ||
5ffbd136 MB |
1287 | rdev->open_count++; |
1288 | if (exclusive) { | |
1289 | rdev->exclusive = 1; | |
1290 | ||
1291 | ret = _regulator_is_enabled(rdev); | |
1292 | if (ret > 0) | |
1293 | rdev->use_count = 1; | |
1294 | else | |
1295 | rdev->use_count = 0; | |
1296 | } | |
1297 | ||
a5766f11 | 1298 | out: |
414c70cb | 1299 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1300 | |
414c70cb LG |
1301 | return regulator; |
1302 | } | |
5ffbd136 MB |
1303 | |
1304 | /** | |
1305 | * regulator_get - lookup and obtain a reference to a regulator. | |
1306 | * @dev: device for regulator "consumer" | |
1307 | * @id: Supply name or regulator ID. | |
1308 | * | |
1309 | * Returns a struct regulator corresponding to the regulator producer, | |
1310 | * or IS_ERR() condition containing errno. | |
1311 | * | |
1312 | * Use of supply names configured via regulator_set_device_supply() is | |
1313 | * strongly encouraged. It is recommended that the supply name used | |
1314 | * should match the name used for the supply and/or the relevant | |
1315 | * device pins in the datasheet. | |
1316 | */ | |
1317 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1318 | { | |
1319 | return _regulator_get(dev, id, 0); | |
1320 | } | |
414c70cb LG |
1321 | EXPORT_SYMBOL_GPL(regulator_get); |
1322 | ||
070b9079 SB |
1323 | static void devm_regulator_release(struct device *dev, void *res) |
1324 | { | |
1325 | regulator_put(*(struct regulator **)res); | |
1326 | } | |
1327 | ||
1328 | /** | |
1329 | * devm_regulator_get - Resource managed regulator_get() | |
1330 | * @dev: device for regulator "consumer" | |
1331 | * @id: Supply name or regulator ID. | |
1332 | * | |
1333 | * Managed regulator_get(). Regulators returned from this function are | |
1334 | * automatically regulator_put() on driver detach. See regulator_get() for more | |
1335 | * information. | |
1336 | */ | |
1337 | struct regulator *devm_regulator_get(struct device *dev, const char *id) | |
1338 | { | |
1339 | struct regulator **ptr, *regulator; | |
1340 | ||
1341 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1342 | if (!ptr) | |
1343 | return ERR_PTR(-ENOMEM); | |
1344 | ||
1345 | regulator = regulator_get(dev, id); | |
1346 | if (!IS_ERR(regulator)) { | |
1347 | *ptr = regulator; | |
1348 | devres_add(dev, ptr); | |
1349 | } else { | |
1350 | devres_free(ptr); | |
1351 | } | |
1352 | ||
1353 | return regulator; | |
1354 | } | |
1355 | EXPORT_SYMBOL_GPL(devm_regulator_get); | |
1356 | ||
5ffbd136 MB |
1357 | /** |
1358 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1359 | * @dev: device for regulator "consumer" | |
1360 | * @id: Supply name or regulator ID. | |
1361 | * | |
1362 | * Returns a struct regulator corresponding to the regulator producer, | |
1363 | * or IS_ERR() condition containing errno. Other consumers will be | |
1364 | * unable to obtain this reference is held and the use count for the | |
1365 | * regulator will be initialised to reflect the current state of the | |
1366 | * regulator. | |
1367 | * | |
1368 | * This is intended for use by consumers which cannot tolerate shared | |
1369 | * use of the regulator such as those which need to force the | |
1370 | * regulator off for correct operation of the hardware they are | |
1371 | * controlling. | |
1372 | * | |
1373 | * Use of supply names configured via regulator_set_device_supply() is | |
1374 | * strongly encouraged. It is recommended that the supply name used | |
1375 | * should match the name used for the supply and/or the relevant | |
1376 | * device pins in the datasheet. | |
1377 | */ | |
1378 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1379 | { | |
1380 | return _regulator_get(dev, id, 1); | |
1381 | } | |
1382 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1383 | ||
414c70cb LG |
1384 | /** |
1385 | * regulator_put - "free" the regulator source | |
1386 | * @regulator: regulator source | |
1387 | * | |
1388 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1389 | * regulator source are balanced by regulator_disable calls prior to calling | |
1390 | * this function. | |
1391 | */ | |
1392 | void regulator_put(struct regulator *regulator) | |
1393 | { | |
1394 | struct regulator_dev *rdev; | |
1395 | ||
1396 | if (regulator == NULL || IS_ERR(regulator)) | |
1397 | return; | |
1398 | ||
414c70cb LG |
1399 | mutex_lock(®ulator_list_mutex); |
1400 | rdev = regulator->rdev; | |
1401 | ||
5de70519 | 1402 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1403 | |
414c70cb | 1404 | /* remove any sysfs entries */ |
e2c98eaf | 1405 | if (regulator->dev) |
414c70cb | 1406 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
5de70519 | 1407 | kfree(regulator->supply_name); |
414c70cb LG |
1408 | list_del(®ulator->list); |
1409 | kfree(regulator); | |
1410 | ||
5ffbd136 MB |
1411 | rdev->open_count--; |
1412 | rdev->exclusive = 0; | |
1413 | ||
414c70cb LG |
1414 | module_put(rdev->owner); |
1415 | mutex_unlock(®ulator_list_mutex); | |
1416 | } | |
1417 | EXPORT_SYMBOL_GPL(regulator_put); | |
1418 | ||
d5ad34f7 MB |
1419 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1420 | { | |
1421 | struct regulator **r = res; | |
1422 | if (!r || !*r) { | |
1423 | WARN_ON(!r || !*r); | |
1424 | return 0; | |
1425 | } | |
1426 | return *r == data; | |
1427 | } | |
1428 | ||
1429 | /** | |
1430 | * devm_regulator_put - Resource managed regulator_put() | |
1431 | * @regulator: regulator to free | |
1432 | * | |
1433 | * Deallocate a regulator allocated with devm_regulator_get(). Normally | |
1434 | * this function will not need to be called and the resource management | |
1435 | * code will ensure that the resource is freed. | |
1436 | */ | |
1437 | void devm_regulator_put(struct regulator *regulator) | |
1438 | { | |
1439 | int rc; | |
1440 | ||
361ff501 | 1441 | rc = devres_release(regulator->dev, devm_regulator_release, |
d5ad34f7 | 1442 | devm_regulator_match, regulator); |
230a5a1c | 1443 | if (rc != 0) |
968c2c17 | 1444 | WARN_ON(rc); |
d5ad34f7 MB |
1445 | } |
1446 | EXPORT_SYMBOL_GPL(devm_regulator_put); | |
1447 | ||
5c5659d0 MB |
1448 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1449 | { | |
1450 | int ret, delay; | |
1451 | ||
1452 | /* Query before enabling in case configuration dependent. */ | |
1453 | ret = _regulator_get_enable_time(rdev); | |
1454 | if (ret >= 0) { | |
1455 | delay = ret; | |
1456 | } else { | |
1457 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1458 | delay = 0; | |
1459 | } | |
1460 | ||
1461 | trace_regulator_enable(rdev_get_name(rdev)); | |
1462 | ||
65f73508 MB |
1463 | if (rdev->ena_gpio) { |
1464 | gpio_set_value_cansleep(rdev->ena_gpio, | |
1465 | !rdev->ena_gpio_invert); | |
1466 | rdev->ena_gpio_state = 1; | |
1467 | } else if (rdev->desc->ops->enable) { | |
5c5659d0 MB |
1468 | ret = rdev->desc->ops->enable(rdev); |
1469 | if (ret < 0) | |
1470 | return ret; | |
1471 | } else { | |
1472 | return -EINVAL; | |
1473 | } | |
1474 | ||
1475 | /* Allow the regulator to ramp; it would be useful to extend | |
1476 | * this for bulk operations so that the regulators can ramp | |
1477 | * together. */ | |
1478 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1479 | ||
1480 | if (delay >= 1000) { | |
1481 | mdelay(delay / 1000); | |
1482 | udelay(delay % 1000); | |
1483 | } else if (delay) { | |
1484 | udelay(delay); | |
1485 | } | |
1486 | ||
1487 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1488 | ||
1489 | return 0; | |
1490 | } | |
1491 | ||
414c70cb LG |
1492 | /* locks held by regulator_enable() */ |
1493 | static int _regulator_enable(struct regulator_dev *rdev) | |
1494 | { | |
5c5659d0 | 1495 | int ret; |
414c70cb | 1496 | |
414c70cb | 1497 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1498 | if (rdev->constraints && |
1499 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1500 | drms_uA_update(rdev); | |
414c70cb | 1501 | |
9a2372fa MB |
1502 | if (rdev->use_count == 0) { |
1503 | /* The regulator may on if it's not switchable or left on */ | |
1504 | ret = _regulator_is_enabled(rdev); | |
1505 | if (ret == -EINVAL || ret == 0) { | |
1506 | if (!_regulator_can_change_status(rdev)) | |
1507 | return -EPERM; | |
1508 | ||
5c5659d0 | 1509 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1510 | if (ret < 0) |
1511 | return ret; | |
1512 | ||
a7433cff | 1513 | } else if (ret < 0) { |
5da84fd9 | 1514 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1515 | return ret; |
1516 | } | |
a7433cff | 1517 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1518 | } |
1519 | ||
9a2372fa MB |
1520 | rdev->use_count++; |
1521 | ||
1522 | return 0; | |
414c70cb LG |
1523 | } |
1524 | ||
1525 | /** | |
1526 | * regulator_enable - enable regulator output | |
1527 | * @regulator: regulator source | |
1528 | * | |
cf7bbcdf MB |
1529 | * Request that the regulator be enabled with the regulator output at |
1530 | * the predefined voltage or current value. Calls to regulator_enable() | |
1531 | * must be balanced with calls to regulator_disable(). | |
1532 | * | |
414c70cb | 1533 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1534 | * hardwired in the regulator. |
414c70cb LG |
1535 | */ |
1536 | int regulator_enable(struct regulator *regulator) | |
1537 | { | |
412aec61 DB |
1538 | struct regulator_dev *rdev = regulator->rdev; |
1539 | int ret = 0; | |
414c70cb | 1540 | |
6492bc1b MB |
1541 | if (regulator->always_on) |
1542 | return 0; | |
1543 | ||
3801b86a MB |
1544 | if (rdev->supply) { |
1545 | ret = regulator_enable(rdev->supply); | |
1546 | if (ret != 0) | |
1547 | return ret; | |
1548 | } | |
1549 | ||
412aec61 | 1550 | mutex_lock(&rdev->mutex); |
cd94b505 | 1551 | ret = _regulator_enable(rdev); |
412aec61 | 1552 | mutex_unlock(&rdev->mutex); |
3801b86a | 1553 | |
d1685e4e | 1554 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1555 | regulator_disable(rdev->supply); |
1556 | ||
414c70cb LG |
1557 | return ret; |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1560 | ||
5c5659d0 MB |
1561 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1562 | { | |
1563 | int ret; | |
1564 | ||
1565 | trace_regulator_disable(rdev_get_name(rdev)); | |
1566 | ||
1567 | if (rdev->ena_gpio) { | |
1568 | gpio_set_value_cansleep(rdev->ena_gpio, | |
1569 | rdev->ena_gpio_invert); | |
1570 | rdev->ena_gpio_state = 0; | |
1571 | ||
1572 | } else if (rdev->desc->ops->disable) { | |
1573 | ret = rdev->desc->ops->disable(rdev); | |
1574 | if (ret != 0) | |
1575 | return ret; | |
1576 | } | |
1577 | ||
1578 | trace_regulator_disable_complete(rdev_get_name(rdev)); | |
1579 | ||
1580 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1581 | NULL); | |
1582 | return 0; | |
1583 | } | |
1584 | ||
414c70cb | 1585 | /* locks held by regulator_disable() */ |
3801b86a | 1586 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1587 | { |
1588 | int ret = 0; | |
1589 | ||
cd94b505 | 1590 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1591 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1592 | return -EIO; |
1593 | ||
414c70cb | 1594 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1595 | if (rdev->use_count == 1 && |
1596 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1597 | |
1598 | /* we are last user */ | |
5c5659d0 MB |
1599 | if (_regulator_can_change_status(rdev)) { |
1600 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1601 | if (ret < 0) { |
5da84fd9 | 1602 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1603 | return ret; |
1604 | } | |
1605 | } | |
1606 | ||
414c70cb LG |
1607 | rdev->use_count = 0; |
1608 | } else if (rdev->use_count > 1) { | |
1609 | ||
1610 | if (rdev->constraints && | |
1611 | (rdev->constraints->valid_ops_mask & | |
1612 | REGULATOR_CHANGE_DRMS)) | |
1613 | drms_uA_update(rdev); | |
1614 | ||
1615 | rdev->use_count--; | |
1616 | } | |
3801b86a | 1617 | |
414c70cb LG |
1618 | return ret; |
1619 | } | |
1620 | ||
1621 | /** | |
1622 | * regulator_disable - disable regulator output | |
1623 | * @regulator: regulator source | |
1624 | * | |
cf7bbcdf MB |
1625 | * Disable the regulator output voltage or current. Calls to |
1626 | * regulator_enable() must be balanced with calls to | |
1627 | * regulator_disable(). | |
69279fb9 | 1628 | * |
414c70cb | 1629 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1630 | * devices have it enabled, the regulator device supports disabling and |
1631 | * machine constraints permit this operation. | |
414c70cb LG |
1632 | */ |
1633 | int regulator_disable(struct regulator *regulator) | |
1634 | { | |
412aec61 DB |
1635 | struct regulator_dev *rdev = regulator->rdev; |
1636 | int ret = 0; | |
414c70cb | 1637 | |
6492bc1b MB |
1638 | if (regulator->always_on) |
1639 | return 0; | |
1640 | ||
412aec61 | 1641 | mutex_lock(&rdev->mutex); |
3801b86a | 1642 | ret = _regulator_disable(rdev); |
412aec61 | 1643 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1644 | |
3801b86a MB |
1645 | if (ret == 0 && rdev->supply) |
1646 | regulator_disable(rdev->supply); | |
8cbf811d | 1647 | |
414c70cb LG |
1648 | return ret; |
1649 | } | |
1650 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1651 | ||
1652 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1653 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1654 | { |
1655 | int ret = 0; | |
1656 | ||
1657 | /* force disable */ | |
1658 | if (rdev->desc->ops->disable) { | |
1659 | /* ah well, who wants to live forever... */ | |
1660 | ret = rdev->desc->ops->disable(rdev); | |
1661 | if (ret < 0) { | |
5da84fd9 | 1662 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1663 | return ret; |
1664 | } | |
1665 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1666 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1667 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1668 | } |
1669 | ||
414c70cb LG |
1670 | return ret; |
1671 | } | |
1672 | ||
1673 | /** | |
1674 | * regulator_force_disable - force disable regulator output | |
1675 | * @regulator: regulator source | |
1676 | * | |
1677 | * Forcibly disable the regulator output voltage or current. | |
1678 | * NOTE: this *will* disable the regulator output even if other consumer | |
1679 | * devices have it enabled. This should be used for situations when device | |
1680 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1681 | */ | |
1682 | int regulator_force_disable(struct regulator *regulator) | |
1683 | { | |
82d15839 | 1684 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1685 | int ret; |
1686 | ||
82d15839 | 1687 | mutex_lock(&rdev->mutex); |
414c70cb | 1688 | regulator->uA_load = 0; |
3801b86a | 1689 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1690 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1691 | |
3801b86a MB |
1692 | if (rdev->supply) |
1693 | while (rdev->open_count--) | |
1694 | regulator_disable(rdev->supply); | |
8cbf811d | 1695 | |
414c70cb LG |
1696 | return ret; |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1699 | ||
da07ecd9 MB |
1700 | static void regulator_disable_work(struct work_struct *work) |
1701 | { | |
1702 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1703 | disable_work.work); | |
1704 | int count, i, ret; | |
1705 | ||
1706 | mutex_lock(&rdev->mutex); | |
1707 | ||
1708 | BUG_ON(!rdev->deferred_disables); | |
1709 | ||
1710 | count = rdev->deferred_disables; | |
1711 | rdev->deferred_disables = 0; | |
1712 | ||
1713 | for (i = 0; i < count; i++) { | |
1714 | ret = _regulator_disable(rdev); | |
1715 | if (ret != 0) | |
1716 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1717 | } | |
1718 | ||
1719 | mutex_unlock(&rdev->mutex); | |
1720 | ||
1721 | if (rdev->supply) { | |
1722 | for (i = 0; i < count; i++) { | |
1723 | ret = regulator_disable(rdev->supply); | |
1724 | if (ret != 0) { | |
1725 | rdev_err(rdev, | |
1726 | "Supply disable failed: %d\n", ret); | |
1727 | } | |
1728 | } | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | /** | |
1733 | * regulator_disable_deferred - disable regulator output with delay | |
1734 | * @regulator: regulator source | |
1735 | * @ms: miliseconds until the regulator is disabled | |
1736 | * | |
1737 | * Execute regulator_disable() on the regulator after a delay. This | |
1738 | * is intended for use with devices that require some time to quiesce. | |
1739 | * | |
1740 | * NOTE: this will only disable the regulator output if no other consumer | |
1741 | * devices have it enabled, the regulator device supports disabling and | |
1742 | * machine constraints permit this operation. | |
1743 | */ | |
1744 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1745 | { | |
1746 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1747 | int ret; |
da07ecd9 | 1748 | |
6492bc1b MB |
1749 | if (regulator->always_on) |
1750 | return 0; | |
1751 | ||
2b5a24a0 MB |
1752 | if (!ms) |
1753 | return regulator_disable(regulator); | |
1754 | ||
da07ecd9 MB |
1755 | mutex_lock(&rdev->mutex); |
1756 | rdev->deferred_disables++; | |
1757 | mutex_unlock(&rdev->mutex); | |
1758 | ||
aa59802d MB |
1759 | ret = schedule_delayed_work(&rdev->disable_work, |
1760 | msecs_to_jiffies(ms)); | |
1761 | if (ret < 0) | |
1762 | return ret; | |
1763 | else | |
1764 | return 0; | |
da07ecd9 MB |
1765 | } |
1766 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1767 | ||
cd6dffb4 MB |
1768 | /** |
1769 | * regulator_is_enabled_regmap - standard is_enabled() for regmap users | |
1770 | * | |
1771 | * @rdev: regulator to operate on | |
1772 | * | |
1773 | * Regulators that use regmap for their register I/O can set the | |
1774 | * enable_reg and enable_mask fields in their descriptor and then use | |
1775 | * this as their is_enabled operation, saving some code. | |
1776 | */ | |
1777 | int regulator_is_enabled_regmap(struct regulator_dev *rdev) | |
1778 | { | |
1779 | unsigned int val; | |
1780 | int ret; | |
1781 | ||
1782 | ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); | |
1783 | if (ret != 0) | |
1784 | return ret; | |
1785 | ||
1786 | return (val & rdev->desc->enable_mask) != 0; | |
1787 | } | |
1788 | EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); | |
1789 | ||
1790 | /** | |
1791 | * regulator_enable_regmap - standard enable() for regmap users | |
1792 | * | |
1793 | * @rdev: regulator to operate on | |
1794 | * | |
1795 | * Regulators that use regmap for their register I/O can set the | |
1796 | * enable_reg and enable_mask fields in their descriptor and then use | |
1797 | * this as their enable() operation, saving some code. | |
1798 | */ | |
1799 | int regulator_enable_regmap(struct regulator_dev *rdev) | |
1800 | { | |
1801 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1802 | rdev->desc->enable_mask, | |
1803 | rdev->desc->enable_mask); | |
1804 | } | |
1805 | EXPORT_SYMBOL_GPL(regulator_enable_regmap); | |
1806 | ||
1807 | /** | |
1808 | * regulator_disable_regmap - standard disable() for regmap users | |
1809 | * | |
1810 | * @rdev: regulator to operate on | |
1811 | * | |
1812 | * Regulators that use regmap for their register I/O can set the | |
1813 | * enable_reg and enable_mask fields in their descriptor and then use | |
1814 | * this as their disable() operation, saving some code. | |
1815 | */ | |
1816 | int regulator_disable_regmap(struct regulator_dev *rdev) | |
1817 | { | |
1818 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1819 | rdev->desc->enable_mask, 0); | |
1820 | } | |
1821 | EXPORT_SYMBOL_GPL(regulator_disable_regmap); | |
1822 | ||
414c70cb LG |
1823 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1824 | { | |
65f73508 MB |
1825 | /* A GPIO control always takes precedence */ |
1826 | if (rdev->ena_gpio) | |
1827 | return rdev->ena_gpio_state; | |
1828 | ||
9a7f6a4c | 1829 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1830 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1831 | return 1; |
414c70cb | 1832 | |
9332546f | 1833 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1834 | } |
1835 | ||
1836 | /** | |
1837 | * regulator_is_enabled - is the regulator output enabled | |
1838 | * @regulator: regulator source | |
1839 | * | |
412aec61 DB |
1840 | * Returns positive if the regulator driver backing the source/client |
1841 | * has requested that the device be enabled, zero if it hasn't, else a | |
1842 | * negative errno code. | |
1843 | * | |
1844 | * Note that the device backing this regulator handle can have multiple | |
1845 | * users, so it might be enabled even if regulator_enable() was never | |
1846 | * called for this particular source. | |
414c70cb LG |
1847 | */ |
1848 | int regulator_is_enabled(struct regulator *regulator) | |
1849 | { | |
9332546f MB |
1850 | int ret; |
1851 | ||
6492bc1b MB |
1852 | if (regulator->always_on) |
1853 | return 1; | |
1854 | ||
9332546f MB |
1855 | mutex_lock(®ulator->rdev->mutex); |
1856 | ret = _regulator_is_enabled(regulator->rdev); | |
1857 | mutex_unlock(®ulator->rdev->mutex); | |
1858 | ||
1859 | return ret; | |
414c70cb LG |
1860 | } |
1861 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1862 | ||
4367cfdc DB |
1863 | /** |
1864 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1865 | * @regulator: regulator source | |
1866 | * | |
1867 | * Returns number of selectors, or negative errno. Selectors are | |
1868 | * numbered starting at zero, and typically correspond to bitfields | |
1869 | * in hardware registers. | |
1870 | */ | |
1871 | int regulator_count_voltages(struct regulator *regulator) | |
1872 | { | |
1873 | struct regulator_dev *rdev = regulator->rdev; | |
1874 | ||
1875 | return rdev->desc->n_voltages ? : -EINVAL; | |
1876 | } | |
1877 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1878 | ||
bca7bbff MB |
1879 | /** |
1880 | * regulator_list_voltage_linear - List voltages with simple calculation | |
1881 | * | |
1882 | * @rdev: Regulator device | |
1883 | * @selector: Selector to convert into a voltage | |
1884 | * | |
1885 | * Regulators with a simple linear mapping between voltages and | |
1886 | * selectors can set min_uV and uV_step in the regulator descriptor | |
1887 | * and then use this function as their list_voltage() operation, | |
1888 | */ | |
1889 | int regulator_list_voltage_linear(struct regulator_dev *rdev, | |
1890 | unsigned int selector) | |
1891 | { | |
1892 | if (selector >= rdev->desc->n_voltages) | |
1893 | return -EINVAL; | |
1894 | ||
1895 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); | |
1896 | } | |
1897 | EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); | |
1898 | ||
cffc9592 AL |
1899 | /** |
1900 | * regulator_list_voltage_table - List voltages with table based mapping | |
1901 | * | |
1902 | * @rdev: Regulator device | |
1903 | * @selector: Selector to convert into a voltage | |
1904 | * | |
1905 | * Regulators with table based mapping between voltages and | |
1906 | * selectors can set volt_table in the regulator descriptor | |
1907 | * and then use this function as their list_voltage() operation. | |
1908 | */ | |
1909 | int regulator_list_voltage_table(struct regulator_dev *rdev, | |
1910 | unsigned int selector) | |
1911 | { | |
1912 | if (!rdev->desc->volt_table) { | |
1913 | BUG_ON(!rdev->desc->volt_table); | |
1914 | return -EINVAL; | |
1915 | } | |
1916 | ||
1917 | if (selector >= rdev->desc->n_voltages) | |
1918 | return -EINVAL; | |
1919 | ||
1920 | return rdev->desc->volt_table[selector]; | |
1921 | } | |
1922 | EXPORT_SYMBOL_GPL(regulator_list_voltage_table); | |
1923 | ||
4367cfdc DB |
1924 | /** |
1925 | * regulator_list_voltage - enumerate supported voltages | |
1926 | * @regulator: regulator source | |
1927 | * @selector: identify voltage to list | |
1928 | * Context: can sleep | |
1929 | * | |
1930 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1931 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1932 | * negative errno. |
1933 | */ | |
1934 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1935 | { | |
1936 | struct regulator_dev *rdev = regulator->rdev; | |
1937 | struct regulator_ops *ops = rdev->desc->ops; | |
1938 | int ret; | |
1939 | ||
1940 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1941 | return -EINVAL; | |
1942 | ||
1943 | mutex_lock(&rdev->mutex); | |
1944 | ret = ops->list_voltage(rdev, selector); | |
1945 | mutex_unlock(&rdev->mutex); | |
1946 | ||
1947 | if (ret > 0) { | |
1948 | if (ret < rdev->constraints->min_uV) | |
1949 | ret = 0; | |
1950 | else if (ret > rdev->constraints->max_uV) | |
1951 | ret = 0; | |
1952 | } | |
1953 | ||
1954 | return ret; | |
1955 | } | |
1956 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1957 | ||
a7a1ad90 MB |
1958 | /** |
1959 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1960 | * | |
1961 | * @regulator: Regulator to check. | |
1962 | * @min_uV: Minimum required voltage in uV. | |
1963 | * @max_uV: Maximum required voltage in uV. | |
1964 | * | |
1965 | * Returns a boolean or a negative error code. | |
1966 | */ | |
1967 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1968 | int min_uV, int max_uV) | |
1969 | { | |
c5f3939b | 1970 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
1971 | int i, voltages, ret; |
1972 | ||
c5f3939b MB |
1973 | /* If we can't change voltage check the current voltage */ |
1974 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
1975 | ret = regulator_get_voltage(regulator); | |
1976 | if (ret >= 0) | |
1977 | return (min_uV >= ret && ret <= max_uV); | |
1978 | else | |
1979 | return ret; | |
1980 | } | |
1981 | ||
a7a1ad90 MB |
1982 | ret = regulator_count_voltages(regulator); |
1983 | if (ret < 0) | |
1984 | return ret; | |
1985 | voltages = ret; | |
1986 | ||
1987 | for (i = 0; i < voltages; i++) { | |
1988 | ret = regulator_list_voltage(regulator, i); | |
1989 | ||
1990 | if (ret >= min_uV && ret <= max_uV) | |
1991 | return 1; | |
1992 | } | |
1993 | ||
1994 | return 0; | |
1995 | } | |
a398eaa2 | 1996 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 1997 | |
4ab5b3d9 MB |
1998 | /** |
1999 | * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users | |
2000 | * | |
2001 | * @rdev: regulator to operate on | |
2002 | * | |
2003 | * Regulators that use regmap for their register I/O can set the | |
2004 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
2005 | * as their get_voltage_vsel operation, saving some code. | |
2006 | */ | |
2007 | int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) | |
2008 | { | |
2009 | unsigned int val; | |
2010 | int ret; | |
2011 | ||
2012 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
2013 | if (ret != 0) | |
2014 | return ret; | |
2015 | ||
2016 | val &= rdev->desc->vsel_mask; | |
2017 | val >>= ffs(rdev->desc->vsel_mask) - 1; | |
2018 | ||
2019 | return val; | |
2020 | } | |
2021 | EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); | |
2022 | ||
2023 | /** | |
2024 | * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users | |
2025 | * | |
2026 | * @rdev: regulator to operate on | |
2027 | * @sel: Selector to set | |
2028 | * | |
2029 | * Regulators that use regmap for their register I/O can set the | |
2030 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
2031 | * as their set_voltage_vsel operation, saving some code. | |
2032 | */ | |
2033 | int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) | |
2034 | { | |
2035 | sel <<= ffs(rdev->desc->vsel_mask) - 1; | |
2036 | ||
2037 | return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, | |
2038 | rdev->desc->vsel_mask, sel); | |
2039 | } | |
2040 | EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); | |
2041 | ||
e843fc46 MB |
2042 | /** |
2043 | * regulator_map_voltage_iterate - map_voltage() based on list_voltage() | |
2044 | * | |
2045 | * @rdev: Regulator to operate on | |
2046 | * @min_uV: Lower bound for voltage | |
2047 | * @max_uV: Upper bound for voltage | |
2048 | * | |
2049 | * Drivers implementing set_voltage_sel() and list_voltage() can use | |
2050 | * this as their map_voltage() operation. It will find a suitable | |
2051 | * voltage by calling list_voltage() until it gets something in bounds | |
2052 | * for the requested voltages. | |
2053 | */ | |
2054 | int regulator_map_voltage_iterate(struct regulator_dev *rdev, | |
2055 | int min_uV, int max_uV) | |
2056 | { | |
2057 | int best_val = INT_MAX; | |
2058 | int selector = 0; | |
2059 | int i, ret; | |
2060 | ||
2061 | /* Find the smallest voltage that falls within the specified | |
2062 | * range. | |
2063 | */ | |
2064 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2065 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
2066 | if (ret < 0) | |
2067 | continue; | |
2068 | ||
2069 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
2070 | best_val = ret; | |
2071 | selector = i; | |
2072 | } | |
2073 | } | |
2074 | ||
2075 | if (best_val != INT_MAX) | |
2076 | return selector; | |
2077 | else | |
2078 | return -EINVAL; | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); | |
2081 | ||
bca7bbff MB |
2082 | /** |
2083 | * regulator_map_voltage_linear - map_voltage() for simple linear mappings | |
2084 | * | |
2085 | * @rdev: Regulator to operate on | |
2086 | * @min_uV: Lower bound for voltage | |
2087 | * @max_uV: Upper bound for voltage | |
2088 | * | |
2089 | * Drivers providing min_uV and uV_step in their regulator_desc can | |
2090 | * use this as their map_voltage() operation. | |
2091 | */ | |
2092 | int regulator_map_voltage_linear(struct regulator_dev *rdev, | |
2093 | int min_uV, int max_uV) | |
2094 | { | |
2095 | int ret, voltage; | |
2096 | ||
5a6881e8 AL |
2097 | /* Allow uV_step to be 0 for fixed voltage */ |
2098 | if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { | |
2099 | if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) | |
2100 | return 0; | |
2101 | else | |
2102 | return -EINVAL; | |
2103 | } | |
2104 | ||
bca7bbff MB |
2105 | if (!rdev->desc->uV_step) { |
2106 | BUG_ON(!rdev->desc->uV_step); | |
2107 | return -EINVAL; | |
2108 | } | |
2109 | ||
0bdc81e4 AL |
2110 | if (min_uV < rdev->desc->min_uV) |
2111 | min_uV = rdev->desc->min_uV; | |
2112 | ||
ccfcb1c3 | 2113 | ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
bca7bbff MB |
2114 | if (ret < 0) |
2115 | return ret; | |
2116 | ||
2117 | /* Map back into a voltage to verify we're still in bounds */ | |
2118 | voltage = rdev->desc->ops->list_voltage(rdev, ret); | |
2119 | if (voltage < min_uV || voltage > max_uV) | |
2120 | return -EINVAL; | |
2121 | ||
2122 | return ret; | |
2123 | } | |
2124 | EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); | |
2125 | ||
75790251 MB |
2126 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2127 | int min_uV, int max_uV) | |
2128 | { | |
2129 | int ret; | |
77af1b26 | 2130 | int delay = 0; |
e113d792 | 2131 | int best_val = 0; |
75790251 | 2132 | unsigned int selector; |
eba41a5e | 2133 | int old_selector = -1; |
75790251 MB |
2134 | |
2135 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2136 | ||
bf5892a8 MB |
2137 | min_uV += rdev->constraints->uV_offset; |
2138 | max_uV += rdev->constraints->uV_offset; | |
2139 | ||
eba41a5e AL |
2140 | /* |
2141 | * If we can't obtain the old selector there is not enough | |
2142 | * info to call set_voltage_time_sel(). | |
2143 | */ | |
8b7485ef AL |
2144 | if (_regulator_is_enabled(rdev) && |
2145 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2146 | rdev->desc->ops->get_voltage_sel) { |
2147 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2148 | if (old_selector < 0) | |
2149 | return old_selector; | |
2150 | } | |
2151 | ||
75790251 MB |
2152 | if (rdev->desc->ops->set_voltage) { |
2153 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2154 | &selector); | |
e113d792 MB |
2155 | |
2156 | if (ret >= 0) { | |
2157 | if (rdev->desc->ops->list_voltage) | |
2158 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2159 | selector); | |
2160 | else | |
2161 | best_val = _regulator_get_voltage(rdev); | |
2162 | } | |
2163 | ||
e8eef82b | 2164 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2165 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2166 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2167 | max_uV); | |
9152c36a AL |
2168 | } else { |
2169 | if (rdev->desc->ops->list_voltage == | |
2170 | regulator_list_voltage_linear) | |
2171 | ret = regulator_map_voltage_linear(rdev, | |
2172 | min_uV, max_uV); | |
2173 | else | |
2174 | ret = regulator_map_voltage_iterate(rdev, | |
2175 | min_uV, max_uV); | |
2176 | } | |
e8eef82b | 2177 | |
e843fc46 | 2178 | if (ret >= 0) { |
e113d792 MB |
2179 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2180 | if (min_uV <= best_val && max_uV >= best_val) { | |
2181 | selector = ret; | |
2182 | ret = rdev->desc->ops->set_voltage_sel(rdev, | |
2183 | ret); | |
2184 | } else { | |
2185 | ret = -EINVAL; | |
2186 | } | |
e8eef82b | 2187 | } |
75790251 MB |
2188 | } else { |
2189 | ret = -EINVAL; | |
2190 | } | |
e8eef82b | 2191 | |
eba41a5e | 2192 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5aff3a8b | 2193 | if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && |
eba41a5e | 2194 | rdev->desc->ops->set_voltage_time_sel) { |
77af1b26 | 2195 | |
eba41a5e AL |
2196 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2197 | old_selector, selector); | |
2198 | if (delay < 0) { | |
2199 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2200 | delay); | |
2201 | delay = 0; | |
e8eef82b | 2202 | } |
75790251 | 2203 | |
8b96de31 PR |
2204 | /* Insert any necessary delays */ |
2205 | if (delay >= 1000) { | |
2206 | mdelay(delay / 1000); | |
2207 | udelay(delay % 1000); | |
2208 | } else if (delay) { | |
2209 | udelay(delay); | |
2210 | } | |
77af1b26 LW |
2211 | } |
2212 | ||
2f6c797f AL |
2213 | if (ret == 0 && best_val >= 0) { |
2214 | unsigned long data = best_val; | |
2215 | ||
ded06a52 | 2216 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2217 | (void *)data); |
2218 | } | |
ded06a52 | 2219 | |
eba41a5e | 2220 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2221 | |
2222 | return ret; | |
2223 | } | |
2224 | ||
414c70cb LG |
2225 | /** |
2226 | * regulator_set_voltage - set regulator output voltage | |
2227 | * @regulator: regulator source | |
2228 | * @min_uV: Minimum required voltage in uV | |
2229 | * @max_uV: Maximum acceptable voltage in uV | |
2230 | * | |
2231 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2232 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2233 | * | |
2234 | * If the regulator is enabled then the voltage will change to the new value | |
2235 | * immediately otherwise if the regulator is disabled the regulator will | |
2236 | * output at the new voltage when enabled. | |
2237 | * | |
2238 | * NOTE: If the regulator is shared between several devices then the lowest | |
2239 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2240 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2241 | * calling this function otherwise this call will fail. |
2242 | */ | |
2243 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2244 | { | |
2245 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2246 | int ret = 0; |
414c70cb LG |
2247 | |
2248 | mutex_lock(&rdev->mutex); | |
2249 | ||
95a3c23a MB |
2250 | /* If we're setting the same range as last time the change |
2251 | * should be a noop (some cpufreq implementations use the same | |
2252 | * voltage for multiple frequencies, for example). | |
2253 | */ | |
2254 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2255 | goto out; | |
2256 | ||
414c70cb | 2257 | /* sanity check */ |
e8eef82b MB |
2258 | if (!rdev->desc->ops->set_voltage && |
2259 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2260 | ret = -EINVAL; |
2261 | goto out; | |
2262 | } | |
2263 | ||
2264 | /* constraints check */ | |
2265 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2266 | if (ret < 0) | |
2267 | goto out; | |
2268 | regulator->min_uV = min_uV; | |
2269 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2270 | |
05fda3b1 TP |
2271 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2272 | if (ret < 0) | |
2273 | goto out; | |
2274 | ||
75790251 | 2275 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 2276 | |
414c70cb LG |
2277 | out: |
2278 | mutex_unlock(&rdev->mutex); | |
2279 | return ret; | |
2280 | } | |
2281 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2282 | ||
88cd222b LW |
2283 | /** |
2284 | * regulator_set_voltage_time - get raise/fall time | |
2285 | * @regulator: regulator source | |
2286 | * @old_uV: starting voltage in microvolts | |
2287 | * @new_uV: target voltage in microvolts | |
2288 | * | |
2289 | * Provided with the starting and ending voltage, this function attempts to | |
2290 | * calculate the time in microseconds required to rise or fall to this new | |
2291 | * voltage. | |
2292 | */ | |
2293 | int regulator_set_voltage_time(struct regulator *regulator, | |
2294 | int old_uV, int new_uV) | |
2295 | { | |
2296 | struct regulator_dev *rdev = regulator->rdev; | |
2297 | struct regulator_ops *ops = rdev->desc->ops; | |
2298 | int old_sel = -1; | |
2299 | int new_sel = -1; | |
2300 | int voltage; | |
2301 | int i; | |
2302 | ||
2303 | /* Currently requires operations to do this */ | |
2304 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2305 | || !rdev->desc->n_voltages) | |
2306 | return -EINVAL; | |
2307 | ||
2308 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2309 | /* We only look for exact voltage matches here */ | |
2310 | voltage = regulator_list_voltage(regulator, i); | |
2311 | if (voltage < 0) | |
2312 | return -EINVAL; | |
2313 | if (voltage == 0) | |
2314 | continue; | |
2315 | if (voltage == old_uV) | |
2316 | old_sel = i; | |
2317 | if (voltage == new_uV) | |
2318 | new_sel = i; | |
2319 | } | |
2320 | ||
2321 | if (old_sel < 0 || new_sel < 0) | |
2322 | return -EINVAL; | |
2323 | ||
2324 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2325 | } | |
2326 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2327 | ||
98a175b6 | 2328 | /** |
296c6566 RD |
2329 | * regulator_set_voltage_time_sel - get raise/fall time |
2330 | * @rdev: regulator source device | |
98a175b6 YSB |
2331 | * @old_selector: selector for starting voltage |
2332 | * @new_selector: selector for target voltage | |
2333 | * | |
2334 | * Provided with the starting and target voltage selectors, this function | |
2335 | * returns time in microseconds required to rise or fall to this new voltage | |
2336 | * | |
f11d08c3 | 2337 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2338 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2339 | */ |
2340 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2341 | unsigned int old_selector, | |
2342 | unsigned int new_selector) | |
2343 | { | |
398715ab | 2344 | unsigned int ramp_delay = 0; |
f11d08c3 | 2345 | int old_volt, new_volt; |
398715ab AL |
2346 | |
2347 | if (rdev->constraints->ramp_delay) | |
2348 | ramp_delay = rdev->constraints->ramp_delay; | |
2349 | else if (rdev->desc->ramp_delay) | |
2350 | ramp_delay = rdev->desc->ramp_delay; | |
2351 | ||
2352 | if (ramp_delay == 0) { | |
6f0b2c69 | 2353 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2354 | return 0; |
6f0b2c69 | 2355 | } |
398715ab | 2356 | |
f11d08c3 AL |
2357 | /* sanity check */ |
2358 | if (!rdev->desc->ops->list_voltage) | |
2359 | return -EINVAL; | |
398715ab | 2360 | |
f11d08c3 AL |
2361 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2362 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2363 | ||
2364 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2365 | } |
b19dbf71 | 2366 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2367 | |
606a2562 MB |
2368 | /** |
2369 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2370 | * @regulator: regulator source | |
2371 | * | |
2372 | * Re-apply the last configured voltage. This is intended to be used | |
2373 | * where some external control source the consumer is cooperating with | |
2374 | * has caused the configured voltage to change. | |
2375 | */ | |
2376 | int regulator_sync_voltage(struct regulator *regulator) | |
2377 | { | |
2378 | struct regulator_dev *rdev = regulator->rdev; | |
2379 | int ret, min_uV, max_uV; | |
2380 | ||
2381 | mutex_lock(&rdev->mutex); | |
2382 | ||
2383 | if (!rdev->desc->ops->set_voltage && | |
2384 | !rdev->desc->ops->set_voltage_sel) { | |
2385 | ret = -EINVAL; | |
2386 | goto out; | |
2387 | } | |
2388 | ||
2389 | /* This is only going to work if we've had a voltage configured. */ | |
2390 | if (!regulator->min_uV && !regulator->max_uV) { | |
2391 | ret = -EINVAL; | |
2392 | goto out; | |
2393 | } | |
2394 | ||
2395 | min_uV = regulator->min_uV; | |
2396 | max_uV = regulator->max_uV; | |
2397 | ||
2398 | /* This should be a paranoia check... */ | |
2399 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2400 | if (ret < 0) | |
2401 | goto out; | |
2402 | ||
2403 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2404 | if (ret < 0) | |
2405 | goto out; | |
2406 | ||
2407 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2408 | ||
2409 | out: | |
2410 | mutex_unlock(&rdev->mutex); | |
2411 | return ret; | |
2412 | } | |
2413 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2414 | ||
414c70cb LG |
2415 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2416 | { | |
bf5892a8 | 2417 | int sel, ret; |
476c2d83 MB |
2418 | |
2419 | if (rdev->desc->ops->get_voltage_sel) { | |
2420 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2421 | if (sel < 0) | |
2422 | return sel; | |
bf5892a8 | 2423 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2424 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2425 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2426 | } else if (rdev->desc->ops->list_voltage) { |
2427 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
cb220d16 | 2428 | } else { |
414c70cb | 2429 | return -EINVAL; |
cb220d16 | 2430 | } |
bf5892a8 | 2431 | |
cb220d16 AL |
2432 | if (ret < 0) |
2433 | return ret; | |
bf5892a8 | 2434 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2435 | } |
2436 | ||
2437 | /** | |
2438 | * regulator_get_voltage - get regulator output voltage | |
2439 | * @regulator: regulator source | |
2440 | * | |
2441 | * This returns the current regulator voltage in uV. | |
2442 | * | |
2443 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2444 | * function should not be used to determine regulator state. | |
2445 | */ | |
2446 | int regulator_get_voltage(struct regulator *regulator) | |
2447 | { | |
2448 | int ret; | |
2449 | ||
2450 | mutex_lock(®ulator->rdev->mutex); | |
2451 | ||
2452 | ret = _regulator_get_voltage(regulator->rdev); | |
2453 | ||
2454 | mutex_unlock(®ulator->rdev->mutex); | |
2455 | ||
2456 | return ret; | |
2457 | } | |
2458 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2459 | ||
2460 | /** | |
2461 | * regulator_set_current_limit - set regulator output current limit | |
2462 | * @regulator: regulator source | |
2463 | * @min_uA: Minimuum supported current in uA | |
2464 | * @max_uA: Maximum supported current in uA | |
2465 | * | |
2466 | * Sets current sink to the desired output current. This can be set during | |
2467 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2468 | * | |
2469 | * If the regulator is enabled then the current will change to the new value | |
2470 | * immediately otherwise if the regulator is disabled the regulator will | |
2471 | * output at the new current when enabled. | |
2472 | * | |
2473 | * NOTE: Regulator system constraints must be set for this regulator before | |
2474 | * calling this function otherwise this call will fail. | |
2475 | */ | |
2476 | int regulator_set_current_limit(struct regulator *regulator, | |
2477 | int min_uA, int max_uA) | |
2478 | { | |
2479 | struct regulator_dev *rdev = regulator->rdev; | |
2480 | int ret; | |
2481 | ||
2482 | mutex_lock(&rdev->mutex); | |
2483 | ||
2484 | /* sanity check */ | |
2485 | if (!rdev->desc->ops->set_current_limit) { | |
2486 | ret = -EINVAL; | |
2487 | goto out; | |
2488 | } | |
2489 | ||
2490 | /* constraints check */ | |
2491 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2492 | if (ret < 0) | |
2493 | goto out; | |
2494 | ||
2495 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2496 | out: | |
2497 | mutex_unlock(&rdev->mutex); | |
2498 | return ret; | |
2499 | } | |
2500 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2501 | ||
2502 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2503 | { | |
2504 | int ret; | |
2505 | ||
2506 | mutex_lock(&rdev->mutex); | |
2507 | ||
2508 | /* sanity check */ | |
2509 | if (!rdev->desc->ops->get_current_limit) { | |
2510 | ret = -EINVAL; | |
2511 | goto out; | |
2512 | } | |
2513 | ||
2514 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2515 | out: | |
2516 | mutex_unlock(&rdev->mutex); | |
2517 | return ret; | |
2518 | } | |
2519 | ||
2520 | /** | |
2521 | * regulator_get_current_limit - get regulator output current | |
2522 | * @regulator: regulator source | |
2523 | * | |
2524 | * This returns the current supplied by the specified current sink in uA. | |
2525 | * | |
2526 | * NOTE: If the regulator is disabled it will return the current value. This | |
2527 | * function should not be used to determine regulator state. | |
2528 | */ | |
2529 | int regulator_get_current_limit(struct regulator *regulator) | |
2530 | { | |
2531 | return _regulator_get_current_limit(regulator->rdev); | |
2532 | } | |
2533 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2534 | ||
2535 | /** | |
2536 | * regulator_set_mode - set regulator operating mode | |
2537 | * @regulator: regulator source | |
2538 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2539 | * | |
2540 | * Set regulator operating mode to increase regulator efficiency or improve | |
2541 | * regulation performance. | |
2542 | * | |
2543 | * NOTE: Regulator system constraints must be set for this regulator before | |
2544 | * calling this function otherwise this call will fail. | |
2545 | */ | |
2546 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2547 | { | |
2548 | struct regulator_dev *rdev = regulator->rdev; | |
2549 | int ret; | |
500b4ac9 | 2550 | int regulator_curr_mode; |
414c70cb LG |
2551 | |
2552 | mutex_lock(&rdev->mutex); | |
2553 | ||
2554 | /* sanity check */ | |
2555 | if (!rdev->desc->ops->set_mode) { | |
2556 | ret = -EINVAL; | |
2557 | goto out; | |
2558 | } | |
2559 | ||
500b4ac9 SI |
2560 | /* return if the same mode is requested */ |
2561 | if (rdev->desc->ops->get_mode) { | |
2562 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2563 | if (regulator_curr_mode == mode) { | |
2564 | ret = 0; | |
2565 | goto out; | |
2566 | } | |
2567 | } | |
2568 | ||
414c70cb | 2569 | /* constraints check */ |
22c51b47 | 2570 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2571 | if (ret < 0) |
2572 | goto out; | |
2573 | ||
2574 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2575 | out: | |
2576 | mutex_unlock(&rdev->mutex); | |
2577 | return ret; | |
2578 | } | |
2579 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2580 | ||
2581 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2582 | { | |
2583 | int ret; | |
2584 | ||
2585 | mutex_lock(&rdev->mutex); | |
2586 | ||
2587 | /* sanity check */ | |
2588 | if (!rdev->desc->ops->get_mode) { | |
2589 | ret = -EINVAL; | |
2590 | goto out; | |
2591 | } | |
2592 | ||
2593 | ret = rdev->desc->ops->get_mode(rdev); | |
2594 | out: | |
2595 | mutex_unlock(&rdev->mutex); | |
2596 | return ret; | |
2597 | } | |
2598 | ||
2599 | /** | |
2600 | * regulator_get_mode - get regulator operating mode | |
2601 | * @regulator: regulator source | |
2602 | * | |
2603 | * Get the current regulator operating mode. | |
2604 | */ | |
2605 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2606 | { | |
2607 | return _regulator_get_mode(regulator->rdev); | |
2608 | } | |
2609 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2610 | ||
2611 | /** | |
2612 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2613 | * @regulator: regulator source | |
2614 | * @uA_load: load current | |
2615 | * | |
2616 | * Notifies the regulator core of a new device load. This is then used by | |
2617 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2618 | * operating mode for the new regulator loading. | |
2619 | * | |
2620 | * Consumer devices notify their supply regulator of the maximum power | |
2621 | * they will require (can be taken from device datasheet in the power | |
2622 | * consumption tables) when they change operational status and hence power | |
2623 | * state. Examples of operational state changes that can affect power | |
2624 | * consumption are :- | |
2625 | * | |
2626 | * o Device is opened / closed. | |
2627 | * o Device I/O is about to begin or has just finished. | |
2628 | * o Device is idling in between work. | |
2629 | * | |
2630 | * This information is also exported via sysfs to userspace. | |
2631 | * | |
2632 | * DRMS will sum the total requested load on the regulator and change | |
2633 | * to the most efficient operating mode if platform constraints allow. | |
2634 | * | |
2635 | * Returns the new regulator mode or error. | |
2636 | */ | |
2637 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2638 | { | |
2639 | struct regulator_dev *rdev = regulator->rdev; | |
2640 | struct regulator *consumer; | |
d92d95b6 | 2641 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
414c70cb LG |
2642 | unsigned int mode; |
2643 | ||
d92d95b6 SB |
2644 | if (rdev->supply) |
2645 | input_uV = regulator_get_voltage(rdev->supply); | |
2646 | ||
414c70cb LG |
2647 | mutex_lock(&rdev->mutex); |
2648 | ||
a4b41483 MB |
2649 | /* |
2650 | * first check to see if we can set modes at all, otherwise just | |
2651 | * tell the consumer everything is OK. | |
2652 | */ | |
414c70cb LG |
2653 | regulator->uA_load = uA_load; |
2654 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2655 | if (ret < 0) { |
2656 | ret = 0; | |
414c70cb | 2657 | goto out; |
a4b41483 | 2658 | } |
414c70cb | 2659 | |
414c70cb LG |
2660 | if (!rdev->desc->ops->get_optimum_mode) |
2661 | goto out; | |
2662 | ||
a4b41483 MB |
2663 | /* |
2664 | * we can actually do this so any errors are indicators of | |
2665 | * potential real failure. | |
2666 | */ | |
2667 | ret = -EINVAL; | |
2668 | ||
854ccbae AL |
2669 | if (!rdev->desc->ops->set_mode) |
2670 | goto out; | |
2671 | ||
414c70cb | 2672 | /* get output voltage */ |
1bf5a1f8 | 2673 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2674 | if (output_uV <= 0) { |
5da84fd9 | 2675 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2676 | goto out; |
2677 | } | |
2678 | ||
d92d95b6 | 2679 | /* No supply? Use constraint voltage */ |
1bf5a1f8 | 2680 | if (input_uV <= 0) |
414c70cb LG |
2681 | input_uV = rdev->constraints->input_uV; |
2682 | if (input_uV <= 0) { | |
5da84fd9 | 2683 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2684 | goto out; |
2685 | } | |
2686 | ||
2687 | /* calc total requested load for this regulator */ | |
2688 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2689 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2690 | |
2691 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2692 | input_uV, output_uV, | |
2693 | total_uA_load); | |
2c608234 | 2694 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2695 | if (ret < 0) { |
5da84fd9 JP |
2696 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2697 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2698 | goto out; |
2699 | } | |
2700 | ||
2701 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2702 | if (ret < 0) { |
5da84fd9 | 2703 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2704 | goto out; |
2705 | } | |
2706 | ret = mode; | |
2707 | out: | |
2708 | mutex_unlock(&rdev->mutex); | |
2709 | return ret; | |
2710 | } | |
2711 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2712 | ||
df367931 MB |
2713 | /** |
2714 | * regulator_set_bypass_regmap - Default set_bypass() using regmap | |
2715 | * | |
2716 | * @rdev: device to operate on. | |
2717 | * @enable: state to set. | |
2718 | */ | |
2719 | int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) | |
2720 | { | |
2721 | unsigned int val; | |
2722 | ||
2723 | if (enable) | |
2724 | val = rdev->desc->bypass_mask; | |
2725 | else | |
2726 | val = 0; | |
2727 | ||
2728 | return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, | |
2729 | rdev->desc->bypass_mask, val); | |
2730 | } | |
2731 | EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); | |
2732 | ||
2733 | /** | |
2734 | * regulator_get_bypass_regmap - Default get_bypass() using regmap | |
2735 | * | |
2736 | * @rdev: device to operate on. | |
2737 | * @enable: current state. | |
2738 | */ | |
2739 | int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) | |
2740 | { | |
2741 | unsigned int val; | |
2742 | int ret; | |
2743 | ||
2744 | ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); | |
2745 | if (ret != 0) | |
2746 | return ret; | |
2747 | ||
2748 | *enable = val & rdev->desc->bypass_mask; | |
2749 | ||
2750 | return 0; | |
2751 | } | |
2752 | EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); | |
2753 | ||
f59c8f9f MB |
2754 | /** |
2755 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
2756 | * | |
2757 | * @regulator: Regulator to configure | |
2758 | * @allow: enable or disable bypass mode | |
2759 | * | |
2760 | * Allow the regulator to go into bypass mode if all other consumers | |
2761 | * for the regulator also enable bypass mode and the machine | |
2762 | * constraints allow this. Bypass mode means that the regulator is | |
2763 | * simply passing the input directly to the output with no regulation. | |
2764 | */ | |
2765 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
2766 | { | |
2767 | struct regulator_dev *rdev = regulator->rdev; | |
2768 | int ret = 0; | |
2769 | ||
2770 | if (!rdev->desc->ops->set_bypass) | |
2771 | return 0; | |
2772 | ||
2773 | if (rdev->constraints && | |
2774 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
2775 | return 0; | |
2776 | ||
2777 | mutex_lock(&rdev->mutex); | |
2778 | ||
2779 | if (enable && !regulator->bypass) { | |
2780 | rdev->bypass_count++; | |
2781 | ||
2782 | if (rdev->bypass_count == rdev->open_count) { | |
2783 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2784 | if (ret != 0) | |
2785 | rdev->bypass_count--; | |
2786 | } | |
2787 | ||
2788 | } else if (!enable && regulator->bypass) { | |
2789 | rdev->bypass_count--; | |
2790 | ||
2791 | if (rdev->bypass_count != rdev->open_count) { | |
2792 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2793 | if (ret != 0) | |
2794 | rdev->bypass_count++; | |
2795 | } | |
2796 | } | |
2797 | ||
2798 | if (ret == 0) | |
2799 | regulator->bypass = enable; | |
2800 | ||
2801 | mutex_unlock(&rdev->mutex); | |
2802 | ||
2803 | return ret; | |
2804 | } | |
2805 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
2806 | ||
414c70cb LG |
2807 | /** |
2808 | * regulator_register_notifier - register regulator event notifier | |
2809 | * @regulator: regulator source | |
69279fb9 | 2810 | * @nb: notifier block |
414c70cb LG |
2811 | * |
2812 | * Register notifier block to receive regulator events. | |
2813 | */ | |
2814 | int regulator_register_notifier(struct regulator *regulator, | |
2815 | struct notifier_block *nb) | |
2816 | { | |
2817 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2818 | nb); | |
2819 | } | |
2820 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2821 | ||
2822 | /** | |
2823 | * regulator_unregister_notifier - unregister regulator event notifier | |
2824 | * @regulator: regulator source | |
69279fb9 | 2825 | * @nb: notifier block |
414c70cb LG |
2826 | * |
2827 | * Unregister regulator event notifier block. | |
2828 | */ | |
2829 | int regulator_unregister_notifier(struct regulator *regulator, | |
2830 | struct notifier_block *nb) | |
2831 | { | |
2832 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2833 | nb); | |
2834 | } | |
2835 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2836 | ||
b136fb44 JC |
2837 | /* notify regulator consumers and downstream regulator consumers. |
2838 | * Note mutex must be held by caller. | |
2839 | */ | |
414c70cb LG |
2840 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2841 | unsigned long event, void *data) | |
2842 | { | |
414c70cb | 2843 | /* call rdev chain first */ |
d8493d21 | 2844 | blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
2845 | } |
2846 | ||
2847 | /** | |
2848 | * regulator_bulk_get - get multiple regulator consumers | |
2849 | * | |
2850 | * @dev: Device to supply | |
2851 | * @num_consumers: Number of consumers to register | |
2852 | * @consumers: Configuration of consumers; clients are stored here. | |
2853 | * | |
2854 | * @return 0 on success, an errno on failure. | |
2855 | * | |
2856 | * This helper function allows drivers to get several regulator | |
2857 | * consumers in one operation. If any of the regulators cannot be | |
2858 | * acquired then any regulators that were allocated will be freed | |
2859 | * before returning to the caller. | |
2860 | */ | |
2861 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2862 | struct regulator_bulk_data *consumers) | |
2863 | { | |
2864 | int i; | |
2865 | int ret; | |
2866 | ||
2867 | for (i = 0; i < num_consumers; i++) | |
2868 | consumers[i].consumer = NULL; | |
2869 | ||
2870 | for (i = 0; i < num_consumers; i++) { | |
2871 | consumers[i].consumer = regulator_get(dev, | |
2872 | consumers[i].supply); | |
2873 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2874 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2875 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2876 | consumers[i].supply, ret); | |
414c70cb LG |
2877 | consumers[i].consumer = NULL; |
2878 | goto err; | |
2879 | } | |
2880 | } | |
2881 | ||
2882 | return 0; | |
2883 | ||
2884 | err: | |
b29c7690 | 2885 | while (--i >= 0) |
414c70cb LG |
2886 | regulator_put(consumers[i].consumer); |
2887 | ||
2888 | return ret; | |
2889 | } | |
2890 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2891 | ||
e6e74030 MB |
2892 | /** |
2893 | * devm_regulator_bulk_get - managed get multiple regulator consumers | |
2894 | * | |
2895 | * @dev: Device to supply | |
2896 | * @num_consumers: Number of consumers to register | |
2897 | * @consumers: Configuration of consumers; clients are stored here. | |
2898 | * | |
2899 | * @return 0 on success, an errno on failure. | |
2900 | * | |
2901 | * This helper function allows drivers to get several regulator | |
2902 | * consumers in one operation with management, the regulators will | |
2903 | * automatically be freed when the device is unbound. If any of the | |
2904 | * regulators cannot be acquired then any regulators that were | |
2905 | * allocated will be freed before returning to the caller. | |
2906 | */ | |
2907 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, | |
2908 | struct regulator_bulk_data *consumers) | |
2909 | { | |
2910 | int i; | |
2911 | int ret; | |
2912 | ||
2913 | for (i = 0; i < num_consumers; i++) | |
2914 | consumers[i].consumer = NULL; | |
2915 | ||
2916 | for (i = 0; i < num_consumers; i++) { | |
2917 | consumers[i].consumer = devm_regulator_get(dev, | |
2918 | consumers[i].supply); | |
2919 | if (IS_ERR(consumers[i].consumer)) { | |
2920 | ret = PTR_ERR(consumers[i].consumer); | |
2921 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
2922 | consumers[i].supply, ret); | |
2923 | consumers[i].consumer = NULL; | |
2924 | goto err; | |
2925 | } | |
2926 | } | |
2927 | ||
2928 | return 0; | |
2929 | ||
2930 | err: | |
2931 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2932 | devm_regulator_put(consumers[i].consumer); | |
2933 | ||
2934 | return ret; | |
2935 | } | |
2936 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); | |
2937 | ||
f21e0e81 MB |
2938 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2939 | { | |
2940 | struct regulator_bulk_data *bulk = data; | |
2941 | ||
2942 | bulk->ret = regulator_enable(bulk->consumer); | |
2943 | } | |
2944 | ||
414c70cb LG |
2945 | /** |
2946 | * regulator_bulk_enable - enable multiple regulator consumers | |
2947 | * | |
2948 | * @num_consumers: Number of consumers | |
2949 | * @consumers: Consumer data; clients are stored here. | |
2950 | * @return 0 on success, an errno on failure | |
2951 | * | |
2952 | * This convenience API allows consumers to enable multiple regulator | |
2953 | * clients in a single API call. If any consumers cannot be enabled | |
2954 | * then any others that were enabled will be disabled again prior to | |
2955 | * return. | |
2956 | */ | |
2957 | int regulator_bulk_enable(int num_consumers, | |
2958 | struct regulator_bulk_data *consumers) | |
2959 | { | |
2955b47d | 2960 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 2961 | int i; |
f21e0e81 | 2962 | int ret = 0; |
414c70cb | 2963 | |
6492bc1b MB |
2964 | for (i = 0; i < num_consumers; i++) { |
2965 | if (consumers[i].consumer->always_on) | |
2966 | consumers[i].ret = 0; | |
2967 | else | |
2968 | async_schedule_domain(regulator_bulk_enable_async, | |
2969 | &consumers[i], &async_domain); | |
2970 | } | |
f21e0e81 MB |
2971 | |
2972 | async_synchronize_full_domain(&async_domain); | |
2973 | ||
2974 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2975 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2976 | if (consumers[i].ret != 0) { |
2977 | ret = consumers[i].ret; | |
414c70cb | 2978 | goto err; |
f21e0e81 | 2979 | } |
414c70cb LG |
2980 | } |
2981 | ||
2982 | return 0; | |
2983 | ||
2984 | err: | |
b29c7690 AL |
2985 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); |
2986 | while (--i >= 0) | |
2987 | regulator_disable(consumers[i].consumer); | |
414c70cb LG |
2988 | |
2989 | return ret; | |
2990 | } | |
2991 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2992 | ||
2993 | /** | |
2994 | * regulator_bulk_disable - disable multiple regulator consumers | |
2995 | * | |
2996 | * @num_consumers: Number of consumers | |
2997 | * @consumers: Consumer data; clients are stored here. | |
2998 | * @return 0 on success, an errno on failure | |
2999 | * | |
3000 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3001 | * clients in a single API call. If any consumers cannot be disabled |
3002 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3003 | * return. |
3004 | */ | |
3005 | int regulator_bulk_disable(int num_consumers, | |
3006 | struct regulator_bulk_data *consumers) | |
3007 | { | |
3008 | int i; | |
01e86f49 | 3009 | int ret, r; |
414c70cb | 3010 | |
49e22632 | 3011 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3012 | ret = regulator_disable(consumers[i].consumer); |
3013 | if (ret != 0) | |
3014 | goto err; | |
3015 | } | |
3016 | ||
3017 | return 0; | |
3018 | ||
3019 | err: | |
5da84fd9 | 3020 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3021 | for (++i; i < num_consumers; ++i) { |
3022 | r = regulator_enable(consumers[i].consumer); | |
3023 | if (r != 0) | |
3024 | pr_err("Failed to reename %s: %d\n", | |
3025 | consumers[i].supply, r); | |
3026 | } | |
414c70cb LG |
3027 | |
3028 | return ret; | |
3029 | } | |
3030 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3031 | ||
e1de2f42 DK |
3032 | /** |
3033 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3034 | * | |
3035 | * @num_consumers: Number of consumers | |
3036 | * @consumers: Consumer data; clients are stored here. | |
3037 | * @return 0 on success, an errno on failure | |
3038 | * | |
3039 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3040 | * clients in a single API call. | |
3041 | * NOTE: This should be used for situations when device damage will | |
3042 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3043 | * Although regulator_force_disable function call for some consumers can | |
3044 | * return error numbers, the function is called for all consumers. | |
3045 | */ | |
3046 | int regulator_bulk_force_disable(int num_consumers, | |
3047 | struct regulator_bulk_data *consumers) | |
3048 | { | |
3049 | int i; | |
3050 | int ret; | |
3051 | ||
3052 | for (i = 0; i < num_consumers; i++) | |
3053 | consumers[i].ret = | |
3054 | regulator_force_disable(consumers[i].consumer); | |
3055 | ||
3056 | for (i = 0; i < num_consumers; i++) { | |
3057 | if (consumers[i].ret != 0) { | |
3058 | ret = consumers[i].ret; | |
3059 | goto out; | |
3060 | } | |
3061 | } | |
3062 | ||
3063 | return 0; | |
3064 | out: | |
3065 | return ret; | |
3066 | } | |
3067 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3068 | ||
414c70cb LG |
3069 | /** |
3070 | * regulator_bulk_free - free multiple regulator consumers | |
3071 | * | |
3072 | * @num_consumers: Number of consumers | |
3073 | * @consumers: Consumer data; clients are stored here. | |
3074 | * | |
3075 | * This convenience API allows consumers to free multiple regulator | |
3076 | * clients in a single API call. | |
3077 | */ | |
3078 | void regulator_bulk_free(int num_consumers, | |
3079 | struct regulator_bulk_data *consumers) | |
3080 | { | |
3081 | int i; | |
3082 | ||
3083 | for (i = 0; i < num_consumers; i++) { | |
3084 | regulator_put(consumers[i].consumer); | |
3085 | consumers[i].consumer = NULL; | |
3086 | } | |
3087 | } | |
3088 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3089 | ||
3090 | /** | |
3091 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3092 | * @rdev: regulator source |
414c70cb | 3093 | * @event: notifier block |
69279fb9 | 3094 | * @data: callback-specific data. |
414c70cb LG |
3095 | * |
3096 | * Called by regulator drivers to notify clients a regulator event has | |
3097 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3098 | * Note lock must be held by caller. |
414c70cb LG |
3099 | */ |
3100 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3101 | unsigned long event, void *data) | |
3102 | { | |
3103 | _notifier_call_chain(rdev, event, data); | |
3104 | return NOTIFY_DONE; | |
3105 | ||
3106 | } | |
3107 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3108 | ||
be721979 MB |
3109 | /** |
3110 | * regulator_mode_to_status - convert a regulator mode into a status | |
3111 | * | |
3112 | * @mode: Mode to convert | |
3113 | * | |
3114 | * Convert a regulator mode into a status. | |
3115 | */ | |
3116 | int regulator_mode_to_status(unsigned int mode) | |
3117 | { | |
3118 | switch (mode) { | |
3119 | case REGULATOR_MODE_FAST: | |
3120 | return REGULATOR_STATUS_FAST; | |
3121 | case REGULATOR_MODE_NORMAL: | |
3122 | return REGULATOR_STATUS_NORMAL; | |
3123 | case REGULATOR_MODE_IDLE: | |
3124 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3125 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3126 | return REGULATOR_STATUS_STANDBY; |
3127 | default: | |
1beaf762 | 3128 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3129 | } |
3130 | } | |
3131 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3132 | ||
7ad68e2f DB |
3133 | /* |
3134 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3135 | * create attributes that can be meaningfully displayed. | |
3136 | */ | |
3137 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3138 | { | |
3139 | struct device *dev = &rdev->dev; | |
3140 | struct regulator_ops *ops = rdev->desc->ops; | |
3141 | int status = 0; | |
3142 | ||
3143 | /* some attributes need specific methods to be displayed */ | |
4c78899b | 3144 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
f2889e65 MB |
3145 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
3146 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { | |
7ad68e2f DB |
3147 | status = device_create_file(dev, &dev_attr_microvolts); |
3148 | if (status < 0) | |
3149 | return status; | |
3150 | } | |
3151 | if (ops->get_current_limit) { | |
3152 | status = device_create_file(dev, &dev_attr_microamps); | |
3153 | if (status < 0) | |
3154 | return status; | |
3155 | } | |
3156 | if (ops->get_mode) { | |
3157 | status = device_create_file(dev, &dev_attr_opmode); | |
3158 | if (status < 0) | |
3159 | return status; | |
3160 | } | |
3161 | if (ops->is_enabled) { | |
3162 | status = device_create_file(dev, &dev_attr_state); | |
3163 | if (status < 0) | |
3164 | return status; | |
3165 | } | |
853116a1 DB |
3166 | if (ops->get_status) { |
3167 | status = device_create_file(dev, &dev_attr_status); | |
3168 | if (status < 0) | |
3169 | return status; | |
3170 | } | |
f59c8f9f MB |
3171 | if (ops->get_bypass) { |
3172 | status = device_create_file(dev, &dev_attr_bypass); | |
3173 | if (status < 0) | |
3174 | return status; | |
3175 | } | |
7ad68e2f DB |
3176 | |
3177 | /* some attributes are type-specific */ | |
3178 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3179 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3180 | if (status < 0) | |
3181 | return status; | |
3182 | } | |
3183 | ||
3184 | /* all the other attributes exist to support constraints; | |
3185 | * don't show them if there are no constraints, or if the | |
3186 | * relevant supporting methods are missing. | |
3187 | */ | |
3188 | if (!rdev->constraints) | |
3189 | return status; | |
3190 | ||
3191 | /* constraints need specific supporting methods */ | |
e8eef82b | 3192 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3193 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3194 | if (status < 0) | |
3195 | return status; | |
3196 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3197 | if (status < 0) | |
3198 | return status; | |
3199 | } | |
3200 | if (ops->set_current_limit) { | |
3201 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3202 | if (status < 0) | |
3203 | return status; | |
3204 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3205 | if (status < 0) | |
3206 | return status; | |
3207 | } | |
3208 | ||
7ad68e2f DB |
3209 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3210 | if (status < 0) | |
3211 | return status; | |
3212 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3213 | if (status < 0) | |
3214 | return status; | |
3215 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3216 | if (status < 0) | |
3217 | return status; | |
3218 | ||
3219 | if (ops->set_suspend_voltage) { | |
3220 | status = device_create_file(dev, | |
3221 | &dev_attr_suspend_standby_microvolts); | |
3222 | if (status < 0) | |
3223 | return status; | |
3224 | status = device_create_file(dev, | |
3225 | &dev_attr_suspend_mem_microvolts); | |
3226 | if (status < 0) | |
3227 | return status; | |
3228 | status = device_create_file(dev, | |
3229 | &dev_attr_suspend_disk_microvolts); | |
3230 | if (status < 0) | |
3231 | return status; | |
3232 | } | |
3233 | ||
3234 | if (ops->set_suspend_mode) { | |
3235 | status = device_create_file(dev, | |
3236 | &dev_attr_suspend_standby_mode); | |
3237 | if (status < 0) | |
3238 | return status; | |
3239 | status = device_create_file(dev, | |
3240 | &dev_attr_suspend_mem_mode); | |
3241 | if (status < 0) | |
3242 | return status; | |
3243 | status = device_create_file(dev, | |
3244 | &dev_attr_suspend_disk_mode); | |
3245 | if (status < 0) | |
3246 | return status; | |
3247 | } | |
3248 | ||
3249 | return status; | |
3250 | } | |
3251 | ||
1130e5b3 MB |
3252 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3253 | { | |
1130e5b3 | 3254 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3255 | if (!rdev->debugfs) { |
1130e5b3 | 3256 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3257 | return; |
3258 | } | |
3259 | ||
3260 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3261 | &rdev->use_count); | |
3262 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3263 | &rdev->open_count); | |
f59c8f9f MB |
3264 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3265 | &rdev->bypass_count); | |
1130e5b3 MB |
3266 | } |
3267 | ||
414c70cb LG |
3268 | /** |
3269 | * regulator_register - register regulator | |
69279fb9 | 3270 | * @regulator_desc: regulator to register |
c172708d | 3271 | * @config: runtime configuration for regulator |
414c70cb LG |
3272 | * |
3273 | * Called by regulator drivers to register a regulator. | |
3274 | * Returns 0 on success. | |
3275 | */ | |
65f26846 MB |
3276 | struct regulator_dev * |
3277 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3278 | const struct regulator_config *config) |
414c70cb | 3279 | { |
9a8f5e07 | 3280 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3281 | const struct regulator_init_data *init_data; |
414c70cb LG |
3282 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3283 | struct regulator_dev *rdev; | |
32c8fad4 | 3284 | struct device *dev; |
a5766f11 | 3285 | int ret, i; |
69511a45 | 3286 | const char *supply = NULL; |
414c70cb | 3287 | |
c172708d | 3288 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3289 | return ERR_PTR(-EINVAL); |
3290 | ||
32c8fad4 | 3291 | dev = config->dev; |
dcf70112 | 3292 | WARN_ON(!dev); |
32c8fad4 | 3293 | |
414c70cb LG |
3294 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3295 | return ERR_PTR(-EINVAL); | |
3296 | ||
cd78dfc6 DL |
3297 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3298 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3299 | return ERR_PTR(-EINVAL); |
3300 | ||
476c2d83 MB |
3301 | /* Only one of each should be implemented */ |
3302 | WARN_ON(regulator_desc->ops->get_voltage && | |
3303 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3304 | WARN_ON(regulator_desc->ops->set_voltage && |
3305 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3306 | |
3307 | /* If we're using selectors we must implement list_voltage. */ | |
3308 | if (regulator_desc->ops->get_voltage_sel && | |
3309 | !regulator_desc->ops->list_voltage) { | |
3310 | return ERR_PTR(-EINVAL); | |
3311 | } | |
e8eef82b MB |
3312 | if (regulator_desc->ops->set_voltage_sel && |
3313 | !regulator_desc->ops->list_voltage) { | |
3314 | return ERR_PTR(-EINVAL); | |
3315 | } | |
476c2d83 | 3316 | |
c172708d MB |
3317 | init_data = config->init_data; |
3318 | ||
414c70cb LG |
3319 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3320 | if (rdev == NULL) | |
3321 | return ERR_PTR(-ENOMEM); | |
3322 | ||
3323 | mutex_lock(®ulator_list_mutex); | |
3324 | ||
3325 | mutex_init(&rdev->mutex); | |
c172708d | 3326 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3327 | rdev->owner = regulator_desc->owner; |
3328 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3329 | if (config->regmap) |
3330 | rdev->regmap = config->regmap; | |
52b84dac | 3331 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3332 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3333 | else if (dev->parent) |
3334 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3335 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3336 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3337 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3338 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3339 | |
a5766f11 | 3340 | /* preform any regulator specific init */ |
9a8f5e07 | 3341 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3342 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3343 | if (ret < 0) |
3344 | goto clean; | |
a5766f11 LG |
3345 | } |
3346 | ||
a5766f11 | 3347 | /* register with sysfs */ |
414c70cb | 3348 | rdev->dev.class = ®ulator_class; |
c172708d | 3349 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3350 | rdev->dev.parent = dev; |
812460a9 KS |
3351 | dev_set_name(&rdev->dev, "regulator.%d", |
3352 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3353 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3354 | if (ret != 0) { |
3355 | put_device(&rdev->dev); | |
4fca9545 | 3356 | goto clean; |
ad7725cb | 3357 | } |
a5766f11 LG |
3358 | |
3359 | dev_set_drvdata(&rdev->dev, rdev); | |
3360 | ||
b2a1ef47 | 3361 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
65f73508 MB |
3362 | ret = gpio_request_one(config->ena_gpio, |
3363 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
3364 | rdev_get_name(rdev)); | |
3365 | if (ret != 0) { | |
3366 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3367 | config->ena_gpio, ret); | |
3368 | goto clean; | |
3369 | } | |
3370 | ||
3371 | rdev->ena_gpio = config->ena_gpio; | |
3372 | rdev->ena_gpio_invert = config->ena_gpio_invert; | |
3373 | ||
3374 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) | |
3375 | rdev->ena_gpio_state = 1; | |
3376 | ||
3377 | if (rdev->ena_gpio_invert) | |
3378 | rdev->ena_gpio_state = !rdev->ena_gpio_state; | |
3379 | } | |
3380 | ||
74f544c1 | 3381 | /* set regulator constraints */ |
9a8f5e07 MB |
3382 | if (init_data) |
3383 | constraints = &init_data->constraints; | |
3384 | ||
3385 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3386 | if (ret < 0) |
3387 | goto scrub; | |
3388 | ||
7ad68e2f DB |
3389 | /* add attributes supported by this regulator */ |
3390 | ret = add_regulator_attributes(rdev); | |
3391 | if (ret < 0) | |
3392 | goto scrub; | |
3393 | ||
9a8f5e07 | 3394 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3395 | supply = init_data->supply_regulator; |
3396 | else if (regulator_desc->supply_name) | |
3397 | supply = regulator_desc->supply_name; | |
3398 | ||
3399 | if (supply) { | |
0178f3e2 | 3400 | struct regulator_dev *r; |
0178f3e2 | 3401 | |
6d191a5f | 3402 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3403 | |
69511a45 RN |
3404 | if (!r) { |
3405 | dev_err(dev, "Failed to find supply %s\n", supply); | |
04bf3011 | 3406 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3407 | goto scrub; |
3408 | } | |
3409 | ||
3410 | ret = set_supply(rdev, r); | |
3411 | if (ret < 0) | |
3412 | goto scrub; | |
b2296bd4 LD |
3413 | |
3414 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3415 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3416 | ret = regulator_enable(rdev->supply); |
3417 | if (ret < 0) | |
3418 | goto scrub; | |
3419 | } | |
0178f3e2 MB |
3420 | } |
3421 | ||
a5766f11 | 3422 | /* add consumers devices */ |
9a8f5e07 MB |
3423 | if (init_data) { |
3424 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3425 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3426 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3427 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3428 | if (ret < 0) { |
3429 | dev_err(dev, "Failed to set supply %s\n", | |
3430 | init_data->consumer_supplies[i].supply); | |
3431 | goto unset_supplies; | |
3432 | } | |
23c2f041 | 3433 | } |
414c70cb | 3434 | } |
a5766f11 LG |
3435 | |
3436 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3437 | |
3438 | rdev_init_debugfs(rdev); | |
a5766f11 | 3439 | out: |
414c70cb LG |
3440 | mutex_unlock(®ulator_list_mutex); |
3441 | return rdev; | |
4fca9545 | 3442 | |
d4033b54 JN |
3443 | unset_supplies: |
3444 | unset_regulator_supplies(rdev); | |
3445 | ||
4fca9545 | 3446 | scrub: |
e81dba85 MB |
3447 | if (rdev->supply) |
3448 | regulator_put(rdev->supply); | |
65f73508 MB |
3449 | if (rdev->ena_gpio) |
3450 | gpio_free(rdev->ena_gpio); | |
1a6958e7 | 3451 | kfree(rdev->constraints); |
4fca9545 | 3452 | device_unregister(&rdev->dev); |
53032daf PW |
3453 | /* device core frees rdev */ |
3454 | rdev = ERR_PTR(ret); | |
3455 | goto out; | |
3456 | ||
4fca9545 DB |
3457 | clean: |
3458 | kfree(rdev); | |
3459 | rdev = ERR_PTR(ret); | |
3460 | goto out; | |
414c70cb LG |
3461 | } |
3462 | EXPORT_SYMBOL_GPL(regulator_register); | |
3463 | ||
3464 | /** | |
3465 | * regulator_unregister - unregister regulator | |
69279fb9 | 3466 | * @rdev: regulator to unregister |
414c70cb LG |
3467 | * |
3468 | * Called by regulator drivers to unregister a regulator. | |
3469 | */ | |
3470 | void regulator_unregister(struct regulator_dev *rdev) | |
3471 | { | |
3472 | if (rdev == NULL) | |
3473 | return; | |
3474 | ||
e032b376 MB |
3475 | if (rdev->supply) |
3476 | regulator_put(rdev->supply); | |
414c70cb | 3477 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3478 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3479 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3480 | WARN_ON(rdev->open_count); |
0f1d747b | 3481 | unset_regulator_supplies(rdev); |
414c70cb | 3482 | list_del(&rdev->list); |
f8c12fe3 | 3483 | kfree(rdev->constraints); |
65f73508 MB |
3484 | if (rdev->ena_gpio) |
3485 | gpio_free(rdev->ena_gpio); | |
58fb5cf5 | 3486 | device_unregister(&rdev->dev); |
414c70cb LG |
3487 | mutex_unlock(®ulator_list_mutex); |
3488 | } | |
3489 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3490 | ||
414c70cb | 3491 | /** |
cf7bbcdf | 3492 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3493 | * @state: system suspend state |
3494 | * | |
3495 | * Configure each regulator with it's suspend operating parameters for state. | |
3496 | * This will usually be called by machine suspend code prior to supending. | |
3497 | */ | |
3498 | int regulator_suspend_prepare(suspend_state_t state) | |
3499 | { | |
3500 | struct regulator_dev *rdev; | |
3501 | int ret = 0; | |
3502 | ||
3503 | /* ON is handled by regulator active state */ | |
3504 | if (state == PM_SUSPEND_ON) | |
3505 | return -EINVAL; | |
3506 | ||
3507 | mutex_lock(®ulator_list_mutex); | |
3508 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3509 | ||
3510 | mutex_lock(&rdev->mutex); | |
3511 | ret = suspend_prepare(rdev, state); | |
3512 | mutex_unlock(&rdev->mutex); | |
3513 | ||
3514 | if (ret < 0) { | |
5da84fd9 | 3515 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3516 | goto out; |
3517 | } | |
3518 | } | |
3519 | out: | |
3520 | mutex_unlock(®ulator_list_mutex); | |
3521 | return ret; | |
3522 | } | |
3523 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3524 | ||
7a32b589 MH |
3525 | /** |
3526 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3527 | * | |
3528 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3529 | * and that should be turned on according to the regulators properties. | |
3530 | */ | |
3531 | int regulator_suspend_finish(void) | |
3532 | { | |
3533 | struct regulator_dev *rdev; | |
3534 | int ret = 0, error; | |
3535 | ||
3536 | mutex_lock(®ulator_list_mutex); | |
3537 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3538 | struct regulator_ops *ops = rdev->desc->ops; | |
3539 | ||
3540 | mutex_lock(&rdev->mutex); | |
3541 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3542 | ops->enable) { | |
3543 | error = ops->enable(rdev); | |
3544 | if (error) | |
3545 | ret = error; | |
3546 | } else { | |
3547 | if (!has_full_constraints) | |
3548 | goto unlock; | |
3549 | if (!ops->disable) | |
3550 | goto unlock; | |
b1a86831 | 3551 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3552 | goto unlock; |
3553 | ||
3554 | error = ops->disable(rdev); | |
3555 | if (error) | |
3556 | ret = error; | |
3557 | } | |
3558 | unlock: | |
3559 | mutex_unlock(&rdev->mutex); | |
3560 | } | |
3561 | mutex_unlock(®ulator_list_mutex); | |
3562 | return ret; | |
3563 | } | |
3564 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3565 | ||
ca725561 MB |
3566 | /** |
3567 | * regulator_has_full_constraints - the system has fully specified constraints | |
3568 | * | |
3569 | * Calling this function will cause the regulator API to disable all | |
3570 | * regulators which have a zero use count and don't have an always_on | |
3571 | * constraint in a late_initcall. | |
3572 | * | |
3573 | * The intention is that this will become the default behaviour in a | |
3574 | * future kernel release so users are encouraged to use this facility | |
3575 | * now. | |
3576 | */ | |
3577 | void regulator_has_full_constraints(void) | |
3578 | { | |
3579 | has_full_constraints = 1; | |
3580 | } | |
3581 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3582 | ||
688fe99a MB |
3583 | /** |
3584 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
3585 | * | |
3586 | * Calling this function will cause the regulator API to provide a | |
3587 | * dummy regulator to consumers if no physical regulator is found, | |
3588 | * allowing most consumers to proceed as though a regulator were | |
3589 | * configured. This allows systems such as those with software | |
3590 | * controllable regulators for the CPU core only to be brought up more | |
3591 | * readily. | |
3592 | */ | |
3593 | void regulator_use_dummy_regulator(void) | |
3594 | { | |
3595 | board_wants_dummy_regulator = true; | |
3596 | } | |
3597 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
3598 | ||
414c70cb LG |
3599 | /** |
3600 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3601 | * @rdev: regulator |
414c70cb LG |
3602 | * |
3603 | * Get rdev regulator driver private data. This call can be used in the | |
3604 | * regulator driver context. | |
3605 | */ | |
3606 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3607 | { | |
3608 | return rdev->reg_data; | |
3609 | } | |
3610 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3611 | ||
3612 | /** | |
3613 | * regulator_get_drvdata - get regulator driver data | |
3614 | * @regulator: regulator | |
3615 | * | |
3616 | * Get regulator driver private data. This call can be used in the consumer | |
3617 | * driver context when non API regulator specific functions need to be called. | |
3618 | */ | |
3619 | void *regulator_get_drvdata(struct regulator *regulator) | |
3620 | { | |
3621 | return regulator->rdev->reg_data; | |
3622 | } | |
3623 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3624 | ||
3625 | /** | |
3626 | * regulator_set_drvdata - set regulator driver data | |
3627 | * @regulator: regulator | |
3628 | * @data: data | |
3629 | */ | |
3630 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3631 | { | |
3632 | regulator->rdev->reg_data = data; | |
3633 | } | |
3634 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3635 | ||
3636 | /** | |
3637 | * regulator_get_id - get regulator ID | |
69279fb9 | 3638 | * @rdev: regulator |
414c70cb LG |
3639 | */ |
3640 | int rdev_get_id(struct regulator_dev *rdev) | |
3641 | { | |
3642 | return rdev->desc->id; | |
3643 | } | |
3644 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3645 | ||
a5766f11 LG |
3646 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3647 | { | |
3648 | return &rdev->dev; | |
3649 | } | |
3650 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3651 | ||
3652 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3653 | { | |
3654 | return reg_init_data->driver_data; | |
3655 | } | |
3656 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3657 | ||
ba55a974 MB |
3658 | #ifdef CONFIG_DEBUG_FS |
3659 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3660 | size_t count, loff_t *ppos) | |
3661 | { | |
3662 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3663 | ssize_t len, ret = 0; | |
3664 | struct regulator_map *map; | |
3665 | ||
3666 | if (!buf) | |
3667 | return -ENOMEM; | |
3668 | ||
3669 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3670 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3671 | "%s -> %s.%s\n", | |
3672 | rdev_get_name(map->regulator), map->dev_name, | |
3673 | map->supply); | |
3674 | if (len >= 0) | |
3675 | ret += len; | |
3676 | if (ret > PAGE_SIZE) { | |
3677 | ret = PAGE_SIZE; | |
3678 | break; | |
3679 | } | |
3680 | } | |
3681 | ||
3682 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3683 | ||
3684 | kfree(buf); | |
3685 | ||
3686 | return ret; | |
3687 | } | |
24751434 | 3688 | #endif |
ba55a974 MB |
3689 | |
3690 | static const struct file_operations supply_map_fops = { | |
24751434 | 3691 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3692 | .read = supply_map_read_file, |
3693 | .llseek = default_llseek, | |
ba55a974 | 3694 | #endif |
24751434 | 3695 | }; |
ba55a974 | 3696 | |
414c70cb LG |
3697 | static int __init regulator_init(void) |
3698 | { | |
34abbd68 MB |
3699 | int ret; |
3700 | ||
34abbd68 MB |
3701 | ret = class_register(®ulator_class); |
3702 | ||
1130e5b3 | 3703 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3704 | if (!debugfs_root) |
1130e5b3 | 3705 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3706 | |
f4d562c6 MB |
3707 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3708 | &supply_map_fops); | |
1130e5b3 | 3709 | |
34abbd68 MB |
3710 | regulator_dummy_init(); |
3711 | ||
3712 | return ret; | |
414c70cb LG |
3713 | } |
3714 | ||
3715 | /* init early to allow our consumers to complete system booting */ | |
3716 | core_initcall(regulator_init); | |
ca725561 MB |
3717 | |
3718 | static int __init regulator_init_complete(void) | |
3719 | { | |
3720 | struct regulator_dev *rdev; | |
3721 | struct regulator_ops *ops; | |
3722 | struct regulation_constraints *c; | |
3723 | int enabled, ret; | |
ca725561 | 3724 | |
86f5fcfc MB |
3725 | /* |
3726 | * Since DT doesn't provide an idiomatic mechanism for | |
3727 | * enabling full constraints and since it's much more natural | |
3728 | * with DT to provide them just assume that a DT enabled | |
3729 | * system has full constraints. | |
3730 | */ | |
3731 | if (of_have_populated_dt()) | |
3732 | has_full_constraints = true; | |
3733 | ||
ca725561 MB |
3734 | mutex_lock(®ulator_list_mutex); |
3735 | ||
3736 | /* If we have a full configuration then disable any regulators | |
3737 | * which are not in use or always_on. This will become the | |
3738 | * default behaviour in the future. | |
3739 | */ | |
3740 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3741 | ops = rdev->desc->ops; | |
3742 | c = rdev->constraints; | |
3743 | ||
f25e0b4f | 3744 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3745 | continue; |
3746 | ||
3747 | mutex_lock(&rdev->mutex); | |
3748 | ||
3749 | if (rdev->use_count) | |
3750 | goto unlock; | |
3751 | ||
3752 | /* If we can't read the status assume it's on. */ | |
3753 | if (ops->is_enabled) | |
3754 | enabled = ops->is_enabled(rdev); | |
3755 | else | |
3756 | enabled = 1; | |
3757 | ||
3758 | if (!enabled) | |
3759 | goto unlock; | |
3760 | ||
3761 | if (has_full_constraints) { | |
3762 | /* We log since this may kill the system if it | |
3763 | * goes wrong. */ | |
5da84fd9 | 3764 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3765 | ret = ops->disable(rdev); |
3766 | if (ret != 0) { | |
5da84fd9 | 3767 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3768 | } |
3769 | } else { | |
3770 | /* The intention is that in future we will | |
3771 | * assume that full constraints are provided | |
3772 | * so warn even if we aren't going to do | |
3773 | * anything here. | |
3774 | */ | |
5da84fd9 | 3775 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3776 | } |
3777 | ||
3778 | unlock: | |
3779 | mutex_unlock(&rdev->mutex); | |
3780 | } | |
3781 | ||
3782 | mutex_unlock(®ulator_list_mutex); | |
3783 | ||
3784 | return 0; | |
3785 | } | |
3786 | late_initcall(regulator_init_complete); |