]>
Commit | Line | Data |
---|---|---|
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); | |
f19b00da | 54 | static LIST_HEAD(regulator_ena_gpio_list); |
21cf891a | 55 | static bool has_full_constraints; |
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 | ||
f19b00da KM |
71 | /* |
72 | * struct regulator_enable_gpio | |
73 | * | |
74 | * Management for shared enable GPIO pin | |
75 | */ | |
76 | struct regulator_enable_gpio { | |
77 | struct list_head list; | |
78 | int gpio; | |
79 | u32 enable_count; /* a number of enabled shared GPIO */ | |
80 | u32 request_count; /* a number of requested shared GPIO */ | |
81 | unsigned int ena_gpio_invert:1; | |
82 | }; | |
83 | ||
414c70cb LG |
84 | /* |
85 | * struct regulator | |
86 | * | |
87 | * One for each consumer device. | |
88 | */ | |
89 | struct regulator { | |
90 | struct device *dev; | |
91 | struct list_head list; | |
6492bc1b | 92 | unsigned int always_on:1; |
f59c8f9f | 93 | unsigned int bypass:1; |
414c70cb LG |
94 | int uA_load; |
95 | int min_uV; | |
96 | int max_uV; | |
414c70cb LG |
97 | char *supply_name; |
98 | struct device_attribute dev_attr; | |
99 | struct regulator_dev *rdev; | |
5de70519 | 100 | struct dentry *debugfs; |
414c70cb LG |
101 | }; |
102 | ||
103 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 104 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
105 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
106 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
107 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
108 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
109 | unsigned long event, void *data); | |
75790251 MB |
110 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
111 | int min_uV, int max_uV); | |
3801b86a MB |
112 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
113 | struct device *dev, | |
114 | const char *supply_name); | |
414c70cb | 115 | |
1083c393 MB |
116 | static const char *rdev_get_name(struct regulator_dev *rdev) |
117 | { | |
118 | if (rdev->constraints && rdev->constraints->name) | |
119 | return rdev->constraints->name; | |
120 | else if (rdev->desc->name) | |
121 | return rdev->desc->name; | |
122 | else | |
123 | return ""; | |
124 | } | |
125 | ||
69511a45 RN |
126 | /** |
127 | * of_get_regulator - get a regulator device node based on supply name | |
128 | * @dev: Device pointer for the consumer (of regulator) device | |
129 | * @supply: regulator supply name | |
130 | * | |
131 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 132 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
133 | * returns NULL. |
134 | */ | |
135 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
136 | { | |
137 | struct device_node *regnode = NULL; | |
138 | char prop_name[32]; /* 32 is max size of property name */ | |
139 | ||
140 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
141 | ||
142 | snprintf(prop_name, 32, "%s-supply", supply); | |
143 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
144 | ||
145 | if (!regnode) { | |
16fbcc3b | 146 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
147 | prop_name, dev->of_node->full_name); |
148 | return NULL; | |
149 | } | |
150 | return regnode; | |
151 | } | |
152 | ||
6492bc1b MB |
153 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
154 | { | |
155 | if (!rdev->constraints) | |
156 | return 0; | |
157 | ||
158 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
159 | return 1; | |
160 | else | |
161 | return 0; | |
162 | } | |
163 | ||
414c70cb LG |
164 | /* Platform voltage constraint check */ |
165 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
166 | int *min_uV, int *max_uV) | |
167 | { | |
168 | BUG_ON(*min_uV > *max_uV); | |
169 | ||
170 | if (!rdev->constraints) { | |
5da84fd9 | 171 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
172 | return -ENODEV; |
173 | } | |
174 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 175 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
176 | return -EPERM; |
177 | } | |
178 | ||
179 | if (*max_uV > rdev->constraints->max_uV) | |
180 | *max_uV = rdev->constraints->max_uV; | |
181 | if (*min_uV < rdev->constraints->min_uV) | |
182 | *min_uV = rdev->constraints->min_uV; | |
183 | ||
89f425ed MB |
184 | if (*min_uV > *max_uV) { |
185 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 186 | *min_uV, *max_uV); |
414c70cb | 187 | return -EINVAL; |
89f425ed | 188 | } |
414c70cb LG |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
05fda3b1 TP |
193 | /* Make sure we select a voltage that suits the needs of all |
194 | * regulator consumers | |
195 | */ | |
196 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
197 | int *min_uV, int *max_uV) | |
198 | { | |
199 | struct regulator *regulator; | |
200 | ||
201 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
202 | /* |
203 | * Assume consumers that didn't say anything are OK | |
204 | * with anything in the constraint range. | |
205 | */ | |
206 | if (!regulator->min_uV && !regulator->max_uV) | |
207 | continue; | |
208 | ||
05fda3b1 TP |
209 | if (*max_uV > regulator->max_uV) |
210 | *max_uV = regulator->max_uV; | |
211 | if (*min_uV < regulator->min_uV) | |
212 | *min_uV = regulator->min_uV; | |
213 | } | |
214 | ||
dd8004af | 215 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
216 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
217 | *min_uV, *max_uV); | |
05fda3b1 | 218 | return -EINVAL; |
dd8004af | 219 | } |
05fda3b1 TP |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
414c70cb LG |
224 | /* current constraint check */ |
225 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
226 | int *min_uA, int *max_uA) | |
227 | { | |
228 | BUG_ON(*min_uA > *max_uA); | |
229 | ||
230 | if (!rdev->constraints) { | |
5da84fd9 | 231 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
232 | return -ENODEV; |
233 | } | |
234 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 235 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
236 | return -EPERM; |
237 | } | |
238 | ||
239 | if (*max_uA > rdev->constraints->max_uA) | |
240 | *max_uA = rdev->constraints->max_uA; | |
241 | if (*min_uA < rdev->constraints->min_uA) | |
242 | *min_uA = rdev->constraints->min_uA; | |
243 | ||
89f425ed MB |
244 | if (*min_uA > *max_uA) { |
245 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 246 | *min_uA, *max_uA); |
414c70cb | 247 | return -EINVAL; |
89f425ed | 248 | } |
414c70cb LG |
249 | |
250 | return 0; | |
251 | } | |
252 | ||
253 | /* operating mode constraint check */ | |
2c608234 | 254 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 255 | { |
2c608234 | 256 | switch (*mode) { |
e573520b DB |
257 | case REGULATOR_MODE_FAST: |
258 | case REGULATOR_MODE_NORMAL: | |
259 | case REGULATOR_MODE_IDLE: | |
260 | case REGULATOR_MODE_STANDBY: | |
261 | break; | |
262 | default: | |
89f425ed | 263 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
264 | return -EINVAL; |
265 | } | |
266 | ||
414c70cb | 267 | if (!rdev->constraints) { |
5da84fd9 | 268 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
269 | return -ENODEV; |
270 | } | |
271 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 272 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
273 | return -EPERM; |
274 | } | |
2c608234 MB |
275 | |
276 | /* The modes are bitmasks, the most power hungry modes having | |
277 | * the lowest values. If the requested mode isn't supported | |
278 | * try higher modes. */ | |
279 | while (*mode) { | |
280 | if (rdev->constraints->valid_modes_mask & *mode) | |
281 | return 0; | |
282 | *mode /= 2; | |
414c70cb | 283 | } |
2c608234 MB |
284 | |
285 | return -EINVAL; | |
414c70cb LG |
286 | } |
287 | ||
288 | /* dynamic regulator mode switching constraint check */ | |
289 | static int regulator_check_drms(struct regulator_dev *rdev) | |
290 | { | |
291 | if (!rdev->constraints) { | |
5da84fd9 | 292 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
293 | return -ENODEV; |
294 | } | |
295 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 296 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
297 | return -EPERM; |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
414c70cb LG |
302 | static ssize_t regulator_uV_show(struct device *dev, |
303 | struct device_attribute *attr, char *buf) | |
304 | { | |
a5766f11 | 305 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
306 | ssize_t ret; |
307 | ||
308 | mutex_lock(&rdev->mutex); | |
309 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
310 | mutex_unlock(&rdev->mutex); | |
311 | ||
312 | return ret; | |
313 | } | |
7ad68e2f | 314 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
315 | |
316 | static ssize_t regulator_uA_show(struct device *dev, | |
317 | struct device_attribute *attr, char *buf) | |
318 | { | |
a5766f11 | 319 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
320 | |
321 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
322 | } | |
7ad68e2f | 323 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 324 | |
587cea27 GKH |
325 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
326 | char *buf) | |
bc558a60 MB |
327 | { |
328 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 329 | |
1083c393 | 330 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 331 | } |
587cea27 | 332 | static DEVICE_ATTR_RO(name); |
bc558a60 | 333 | |
4fca9545 | 334 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 335 | { |
414c70cb LG |
336 | switch (mode) { |
337 | case REGULATOR_MODE_FAST: | |
338 | return sprintf(buf, "fast\n"); | |
339 | case REGULATOR_MODE_NORMAL: | |
340 | return sprintf(buf, "normal\n"); | |
341 | case REGULATOR_MODE_IDLE: | |
342 | return sprintf(buf, "idle\n"); | |
343 | case REGULATOR_MODE_STANDBY: | |
344 | return sprintf(buf, "standby\n"); | |
345 | } | |
346 | return sprintf(buf, "unknown\n"); | |
347 | } | |
348 | ||
4fca9545 DB |
349 | static ssize_t regulator_opmode_show(struct device *dev, |
350 | struct device_attribute *attr, char *buf) | |
414c70cb | 351 | { |
a5766f11 | 352 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 353 | |
4fca9545 DB |
354 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
355 | } | |
7ad68e2f | 356 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
357 | |
358 | static ssize_t regulator_print_state(char *buf, int state) | |
359 | { | |
414c70cb LG |
360 | if (state > 0) |
361 | return sprintf(buf, "enabled\n"); | |
362 | else if (state == 0) | |
363 | return sprintf(buf, "disabled\n"); | |
364 | else | |
365 | return sprintf(buf, "unknown\n"); | |
366 | } | |
367 | ||
4fca9545 DB |
368 | static ssize_t regulator_state_show(struct device *dev, |
369 | struct device_attribute *attr, char *buf) | |
370 | { | |
371 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
372 | ssize_t ret; |
373 | ||
374 | mutex_lock(&rdev->mutex); | |
375 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
376 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 377 | |
9332546f | 378 | return ret; |
4fca9545 | 379 | } |
7ad68e2f | 380 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 381 | |
853116a1 DB |
382 | static ssize_t regulator_status_show(struct device *dev, |
383 | struct device_attribute *attr, char *buf) | |
384 | { | |
385 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
386 | int status; | |
387 | char *label; | |
388 | ||
389 | status = rdev->desc->ops->get_status(rdev); | |
390 | if (status < 0) | |
391 | return status; | |
392 | ||
393 | switch (status) { | |
394 | case REGULATOR_STATUS_OFF: | |
395 | label = "off"; | |
396 | break; | |
397 | case REGULATOR_STATUS_ON: | |
398 | label = "on"; | |
399 | break; | |
400 | case REGULATOR_STATUS_ERROR: | |
401 | label = "error"; | |
402 | break; | |
403 | case REGULATOR_STATUS_FAST: | |
404 | label = "fast"; | |
405 | break; | |
406 | case REGULATOR_STATUS_NORMAL: | |
407 | label = "normal"; | |
408 | break; | |
409 | case REGULATOR_STATUS_IDLE: | |
410 | label = "idle"; | |
411 | break; | |
412 | case REGULATOR_STATUS_STANDBY: | |
413 | label = "standby"; | |
414 | break; | |
f59c8f9f MB |
415 | case REGULATOR_STATUS_BYPASS: |
416 | label = "bypass"; | |
417 | break; | |
1beaf762 KG |
418 | case REGULATOR_STATUS_UNDEFINED: |
419 | label = "undefined"; | |
420 | break; | |
853116a1 DB |
421 | default: |
422 | return -ERANGE; | |
423 | } | |
424 | ||
425 | return sprintf(buf, "%s\n", label); | |
426 | } | |
427 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
428 | ||
414c70cb LG |
429 | static ssize_t regulator_min_uA_show(struct device *dev, |
430 | struct device_attribute *attr, char *buf) | |
431 | { | |
a5766f11 | 432 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
433 | |
434 | if (!rdev->constraints) | |
435 | return sprintf(buf, "constraint not defined\n"); | |
436 | ||
437 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
438 | } | |
7ad68e2f | 439 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
440 | |
441 | static ssize_t regulator_max_uA_show(struct device *dev, | |
442 | struct device_attribute *attr, char *buf) | |
443 | { | |
a5766f11 | 444 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
445 | |
446 | if (!rdev->constraints) | |
447 | return sprintf(buf, "constraint not defined\n"); | |
448 | ||
449 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
450 | } | |
7ad68e2f | 451 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
452 | |
453 | static ssize_t regulator_min_uV_show(struct device *dev, | |
454 | struct device_attribute *attr, char *buf) | |
455 | { | |
a5766f11 | 456 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
457 | |
458 | if (!rdev->constraints) | |
459 | return sprintf(buf, "constraint not defined\n"); | |
460 | ||
461 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
462 | } | |
7ad68e2f | 463 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
464 | |
465 | static ssize_t regulator_max_uV_show(struct device *dev, | |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
a5766f11 | 468 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
469 | |
470 | if (!rdev->constraints) | |
471 | return sprintf(buf, "constraint not defined\n"); | |
472 | ||
473 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
474 | } | |
7ad68e2f | 475 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
476 | |
477 | static ssize_t regulator_total_uA_show(struct device *dev, | |
478 | struct device_attribute *attr, char *buf) | |
479 | { | |
a5766f11 | 480 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
481 | struct regulator *regulator; |
482 | int uA = 0; | |
483 | ||
484 | mutex_lock(&rdev->mutex); | |
485 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 486 | uA += regulator->uA_load; |
414c70cb LG |
487 | mutex_unlock(&rdev->mutex); |
488 | return sprintf(buf, "%d\n", uA); | |
489 | } | |
7ad68e2f | 490 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 491 | |
587cea27 GKH |
492 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
493 | char *buf) | |
414c70cb | 494 | { |
a5766f11 | 495 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
496 | return sprintf(buf, "%d\n", rdev->use_count); |
497 | } | |
587cea27 | 498 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 499 | |
587cea27 GKH |
500 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
501 | char *buf) | |
414c70cb | 502 | { |
a5766f11 | 503 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
504 | |
505 | switch (rdev->desc->type) { | |
506 | case REGULATOR_VOLTAGE: | |
507 | return sprintf(buf, "voltage\n"); | |
508 | case REGULATOR_CURRENT: | |
509 | return sprintf(buf, "current\n"); | |
510 | } | |
511 | return sprintf(buf, "unknown\n"); | |
512 | } | |
587cea27 | 513 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
514 | |
515 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
516 | struct device_attribute *attr, char *buf) | |
517 | { | |
a5766f11 | 518 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 519 | |
414c70cb LG |
520 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
521 | } | |
7ad68e2f DB |
522 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
523 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
524 | |
525 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
526 | struct device_attribute *attr, char *buf) | |
527 | { | |
a5766f11 | 528 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 529 | |
414c70cb LG |
530 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
531 | } | |
7ad68e2f DB |
532 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
533 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
534 | |
535 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
536 | struct device_attribute *attr, char *buf) | |
537 | { | |
a5766f11 | 538 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 539 | |
414c70cb LG |
540 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
541 | } | |
7ad68e2f DB |
542 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
543 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 544 | |
414c70cb LG |
545 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
546 | struct device_attribute *attr, char *buf) | |
547 | { | |
a5766f11 | 548 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 549 | |
4fca9545 DB |
550 | return regulator_print_opmode(buf, |
551 | rdev->constraints->state_mem.mode); | |
414c70cb | 552 | } |
7ad68e2f DB |
553 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
554 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
555 | |
556 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
557 | struct device_attribute *attr, char *buf) | |
558 | { | |
a5766f11 | 559 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 560 | |
4fca9545 DB |
561 | return regulator_print_opmode(buf, |
562 | rdev->constraints->state_disk.mode); | |
414c70cb | 563 | } |
7ad68e2f DB |
564 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
565 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
566 | |
567 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
568 | struct device_attribute *attr, char *buf) | |
569 | { | |
a5766f11 | 570 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 571 | |
4fca9545 DB |
572 | return regulator_print_opmode(buf, |
573 | rdev->constraints->state_standby.mode); | |
414c70cb | 574 | } |
7ad68e2f DB |
575 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
576 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
577 | |
578 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
579 | struct device_attribute *attr, char *buf) | |
580 | { | |
a5766f11 | 581 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 582 | |
4fca9545 DB |
583 | return regulator_print_state(buf, |
584 | rdev->constraints->state_mem.enabled); | |
414c70cb | 585 | } |
7ad68e2f DB |
586 | static DEVICE_ATTR(suspend_mem_state, 0444, |
587 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
588 | |
589 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
590 | struct device_attribute *attr, char *buf) | |
591 | { | |
a5766f11 | 592 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 593 | |
4fca9545 DB |
594 | return regulator_print_state(buf, |
595 | rdev->constraints->state_disk.enabled); | |
414c70cb | 596 | } |
7ad68e2f DB |
597 | static DEVICE_ATTR(suspend_disk_state, 0444, |
598 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
599 | |
600 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
601 | struct device_attribute *attr, char *buf) | |
602 | { | |
a5766f11 | 603 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 604 | |
4fca9545 DB |
605 | return regulator_print_state(buf, |
606 | rdev->constraints->state_standby.enabled); | |
414c70cb | 607 | } |
7ad68e2f DB |
608 | static DEVICE_ATTR(suspend_standby_state, 0444, |
609 | regulator_suspend_standby_state_show, NULL); | |
610 | ||
f59c8f9f MB |
611 | static ssize_t regulator_bypass_show(struct device *dev, |
612 | struct device_attribute *attr, char *buf) | |
613 | { | |
614 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
615 | const char *report; | |
616 | bool bypass; | |
617 | int ret; | |
618 | ||
619 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
620 | ||
621 | if (ret != 0) | |
622 | report = "unknown"; | |
623 | else if (bypass) | |
624 | report = "enabled"; | |
625 | else | |
626 | report = "disabled"; | |
627 | ||
628 | return sprintf(buf, "%s\n", report); | |
629 | } | |
630 | static DEVICE_ATTR(bypass, 0444, | |
631 | regulator_bypass_show, NULL); | |
bc558a60 | 632 | |
7ad68e2f DB |
633 | /* |
634 | * These are the only attributes are present for all regulators. | |
635 | * Other attributes are a function of regulator functionality. | |
636 | */ | |
587cea27 GKH |
637 | static struct attribute *regulator_dev_attrs[] = { |
638 | &dev_attr_name.attr, | |
639 | &dev_attr_num_users.attr, | |
640 | &dev_attr_type.attr, | |
641 | NULL, | |
414c70cb | 642 | }; |
587cea27 | 643 | ATTRIBUTE_GROUPS(regulator_dev); |
414c70cb LG |
644 | |
645 | static void regulator_dev_release(struct device *dev) | |
646 | { | |
a5766f11 | 647 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
648 | kfree(rdev); |
649 | } | |
650 | ||
651 | static struct class regulator_class = { | |
652 | .name = "regulator", | |
653 | .dev_release = regulator_dev_release, | |
587cea27 | 654 | .dev_groups = regulator_dev_groups, |
414c70cb LG |
655 | }; |
656 | ||
657 | /* Calculate the new optimum regulator operating mode based on the new total | |
658 | * consumer load. All locks held by caller */ | |
659 | static void drms_uA_update(struct regulator_dev *rdev) | |
660 | { | |
661 | struct regulator *sibling; | |
662 | int current_uA = 0, output_uV, input_uV, err; | |
663 | unsigned int mode; | |
664 | ||
665 | err = regulator_check_drms(rdev); | |
666 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
667 | (!rdev->desc->ops->get_voltage && |
668 | !rdev->desc->ops->get_voltage_sel) || | |
669 | !rdev->desc->ops->set_mode) | |
036de8ef | 670 | return; |
414c70cb LG |
671 | |
672 | /* get output voltage */ | |
1bf5a1f8 | 673 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
674 | if (output_uV <= 0) |
675 | return; | |
676 | ||
677 | /* get input voltage */ | |
1bf5a1f8 MB |
678 | input_uV = 0; |
679 | if (rdev->supply) | |
3f24f5ad | 680 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 681 | if (input_uV <= 0) |
414c70cb LG |
682 | input_uV = rdev->constraints->input_uV; |
683 | if (input_uV <= 0) | |
684 | return; | |
685 | ||
686 | /* calc total requested load */ | |
687 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 688 | current_uA += sibling->uA_load; |
414c70cb LG |
689 | |
690 | /* now get the optimum mode for our new total regulator load */ | |
691 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
692 | output_uV, current_uA); | |
693 | ||
694 | /* check the new mode is allowed */ | |
2c608234 | 695 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
696 | if (err == 0) |
697 | rdev->desc->ops->set_mode(rdev, mode); | |
698 | } | |
699 | ||
700 | static int suspend_set_state(struct regulator_dev *rdev, | |
701 | struct regulator_state *rstate) | |
702 | { | |
703 | int ret = 0; | |
638f85c5 MB |
704 | |
705 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
706 | * only warn if the driver implements set_suspend_voltage or |
707 | * set_suspend_mode callback. | |
638f85c5 MB |
708 | */ |
709 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
710 | if (rdev->desc->ops->set_suspend_voltage || |
711 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 712 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
713 | return 0; |
714 | } | |
715 | ||
716 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 717 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
718 | return -EINVAL; |
719 | } | |
414c70cb | 720 | |
8ac0e95d | 721 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 722 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 723 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 724 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
725 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
726 | ret = 0; | |
727 | ||
414c70cb | 728 | if (ret < 0) { |
5da84fd9 | 729 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
730 | return ret; |
731 | } | |
732 | ||
733 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
734 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
735 | if (ret < 0) { | |
5da84fd9 | 736 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
737 | return ret; |
738 | } | |
739 | } | |
740 | ||
741 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
742 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
743 | if (ret < 0) { | |
5da84fd9 | 744 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
745 | return ret; |
746 | } | |
747 | } | |
748 | return ret; | |
749 | } | |
750 | ||
751 | /* locks held by caller */ | |
752 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
753 | { | |
754 | if (!rdev->constraints) | |
755 | return -EINVAL; | |
756 | ||
757 | switch (state) { | |
758 | case PM_SUSPEND_STANDBY: | |
759 | return suspend_set_state(rdev, | |
760 | &rdev->constraints->state_standby); | |
761 | case PM_SUSPEND_MEM: | |
762 | return suspend_set_state(rdev, | |
763 | &rdev->constraints->state_mem); | |
764 | case PM_SUSPEND_MAX: | |
765 | return suspend_set_state(rdev, | |
766 | &rdev->constraints->state_disk); | |
767 | default: | |
768 | return -EINVAL; | |
769 | } | |
770 | } | |
771 | ||
772 | static void print_constraints(struct regulator_dev *rdev) | |
773 | { | |
774 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 775 | char buf[80] = ""; |
8f031b48 MB |
776 | int count = 0; |
777 | int ret; | |
414c70cb | 778 | |
8f031b48 | 779 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 780 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
781 | count += sprintf(buf + count, "%d mV ", |
782 | constraints->min_uV / 1000); | |
414c70cb | 783 | else |
8f031b48 MB |
784 | count += sprintf(buf + count, "%d <--> %d mV ", |
785 | constraints->min_uV / 1000, | |
786 | constraints->max_uV / 1000); | |
787 | } | |
788 | ||
789 | if (!constraints->min_uV || | |
790 | constraints->min_uV != constraints->max_uV) { | |
791 | ret = _regulator_get_voltage(rdev); | |
792 | if (ret > 0) | |
793 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
794 | } | |
795 | ||
bf5892a8 MB |
796 | if (constraints->uV_offset) |
797 | count += sprintf(buf, "%dmV offset ", | |
798 | constraints->uV_offset / 1000); | |
799 | ||
8f031b48 | 800 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 801 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
802 | count += sprintf(buf + count, "%d mA ", |
803 | constraints->min_uA / 1000); | |
414c70cb | 804 | else |
8f031b48 MB |
805 | count += sprintf(buf + count, "%d <--> %d mA ", |
806 | constraints->min_uA / 1000, | |
807 | constraints->max_uA / 1000); | |
808 | } | |
809 | ||
810 | if (!constraints->min_uA || | |
811 | constraints->min_uA != constraints->max_uA) { | |
812 | ret = _regulator_get_current_limit(rdev); | |
813 | if (ret > 0) | |
e4a6376b | 814 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 815 | } |
8f031b48 | 816 | |
414c70cb LG |
817 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
818 | count += sprintf(buf + count, "fast "); | |
819 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
820 | count += sprintf(buf + count, "normal "); | |
821 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
822 | count += sprintf(buf + count, "idle "); | |
823 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
824 | count += sprintf(buf + count, "standby"); | |
825 | ||
215b8b05 UKK |
826 | if (!count) |
827 | sprintf(buf, "no parameters"); | |
828 | ||
13ce29f8 | 829 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
830 | |
831 | if ((constraints->min_uV != constraints->max_uV) && | |
832 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
833 | rdev_warn(rdev, | |
834 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
835 | } |
836 | ||
e79055d6 | 837 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 838 | struct regulation_constraints *constraints) |
a5766f11 | 839 | { |
e5fda26c | 840 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
841 | int ret; |
842 | ||
843 | /* do we need to apply the constraint voltage */ | |
844 | if (rdev->constraints->apply_uV && | |
75790251 MB |
845 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
846 | ret = _regulator_do_set_voltage(rdev, | |
847 | rdev->constraints->min_uV, | |
848 | rdev->constraints->max_uV); | |
849 | if (ret < 0) { | |
850 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
851 | rdev->constraints->min_uV); | |
75790251 MB |
852 | return ret; |
853 | } | |
af5866c9 | 854 | } |
e06f5b4f | 855 | |
4367cfdc DB |
856 | /* constrain machine-level voltage specs to fit |
857 | * the actual range supported by this regulator. | |
858 | */ | |
859 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
860 | int count = rdev->desc->n_voltages; | |
861 | int i; | |
862 | int min_uV = INT_MAX; | |
863 | int max_uV = INT_MIN; | |
864 | int cmin = constraints->min_uV; | |
865 | int cmax = constraints->max_uV; | |
866 | ||
3e590918 MB |
867 | /* it's safe to autoconfigure fixed-voltage supplies |
868 | and the constraints are used by list_voltage. */ | |
4367cfdc | 869 | if (count == 1 && !cmin) { |
3e590918 | 870 | cmin = 1; |
4367cfdc | 871 | cmax = INT_MAX; |
3e590918 MB |
872 | constraints->min_uV = cmin; |
873 | constraints->max_uV = cmax; | |
4367cfdc DB |
874 | } |
875 | ||
3e2b9abd MB |
876 | /* voltage constraints are optional */ |
877 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 878 | return 0; |
3e2b9abd | 879 | |
4367cfdc | 880 | /* else require explicit machine-level constraints */ |
3e2b9abd | 881 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 882 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 883 | return -EINVAL; |
4367cfdc DB |
884 | } |
885 | ||
886 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
887 | for (i = 0; i < count; i++) { | |
888 | int value; | |
889 | ||
890 | value = ops->list_voltage(rdev, i); | |
891 | if (value <= 0) | |
892 | continue; | |
893 | ||
894 | /* maybe adjust [min_uV..max_uV] */ | |
895 | if (value >= cmin && value < min_uV) | |
896 | min_uV = value; | |
897 | if (value <= cmax && value > max_uV) | |
898 | max_uV = value; | |
899 | } | |
900 | ||
901 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
902 | if (max_uV < min_uV) { | |
fff15bef MB |
903 | rdev_err(rdev, |
904 | "unsupportable voltage constraints %u-%uuV\n", | |
905 | min_uV, max_uV); | |
e79055d6 | 906 | return -EINVAL; |
4367cfdc DB |
907 | } |
908 | ||
909 | /* use regulator's subset of machine constraints */ | |
910 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
911 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
912 | constraints->min_uV, min_uV); | |
4367cfdc DB |
913 | constraints->min_uV = min_uV; |
914 | } | |
915 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
916 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
917 | constraints->max_uV, max_uV); | |
4367cfdc DB |
918 | constraints->max_uV = max_uV; |
919 | } | |
920 | } | |
921 | ||
e79055d6 MB |
922 | return 0; |
923 | } | |
924 | ||
925 | /** | |
926 | * set_machine_constraints - sets regulator constraints | |
927 | * @rdev: regulator source | |
928 | * @constraints: constraints to apply | |
929 | * | |
930 | * Allows platform initialisation code to define and constrain | |
931 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
932 | * Constraints *must* be set by platform code in order for some | |
933 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
934 | * set_mode. | |
935 | */ | |
936 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 937 | const struct regulation_constraints *constraints) |
e79055d6 MB |
938 | { |
939 | int ret = 0; | |
e79055d6 MB |
940 | struct regulator_ops *ops = rdev->desc->ops; |
941 | ||
9a8f5e07 MB |
942 | if (constraints) |
943 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
944 | GFP_KERNEL); | |
945 | else | |
946 | rdev->constraints = kzalloc(sizeof(*constraints), | |
947 | GFP_KERNEL); | |
f8c12fe3 MB |
948 | if (!rdev->constraints) |
949 | return -ENOMEM; | |
af5866c9 | 950 | |
f8c12fe3 | 951 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
952 | if (ret != 0) |
953 | goto out; | |
954 | ||
a5766f11 | 955 | /* do we need to setup our suspend state */ |
9a8f5e07 | 956 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 957 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 958 | if (ret < 0) { |
5da84fd9 | 959 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
960 | goto out; |
961 | } | |
962 | } | |
a5766f11 | 963 | |
9a8f5e07 | 964 | if (rdev->constraints->initial_mode) { |
a308466c | 965 | if (!ops->set_mode) { |
5da84fd9 | 966 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
967 | ret = -EINVAL; |
968 | goto out; | |
969 | } | |
970 | ||
f8c12fe3 | 971 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 972 | if (ret < 0) { |
5da84fd9 | 973 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
974 | goto out; |
975 | } | |
976 | } | |
977 | ||
cacf90f2 MB |
978 | /* If the constraints say the regulator should be on at this point |
979 | * and we have control then make sure it is enabled. | |
980 | */ | |
f8c12fe3 MB |
981 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
982 | ops->enable) { | |
e5fda26c MB |
983 | ret = ops->enable(rdev); |
984 | if (ret < 0) { | |
5da84fd9 | 985 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
986 | goto out; |
987 | } | |
988 | } | |
989 | ||
1653ccf4 YSB |
990 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
991 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
992 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
993 | if (ret < 0) { | |
994 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
995 | goto out; | |
996 | } | |
997 | } | |
998 | ||
a5766f11 | 999 | print_constraints(rdev); |
1a6958e7 | 1000 | return 0; |
a5766f11 | 1001 | out: |
1a6958e7 AL |
1002 | kfree(rdev->constraints); |
1003 | rdev->constraints = NULL; | |
a5766f11 LG |
1004 | return ret; |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1009 | * @rdev: regulator name |
1010 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1011 | * |
1012 | * Called by platform initialisation code to set the supply regulator for this | |
1013 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1014 | * core if it's child is enabled. | |
1015 | */ | |
1016 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1017 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1018 | { |
1019 | int err; | |
1020 | ||
3801b86a MB |
1021 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1022 | ||
1023 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1024 | if (rdev->supply == NULL) { |
1025 | err = -ENOMEM; | |
3801b86a | 1026 | return err; |
a5766f11 | 1027 | } |
57ad526a | 1028 | supply_rdev->open_count++; |
3801b86a MB |
1029 | |
1030 | return 0; | |
a5766f11 LG |
1031 | } |
1032 | ||
1033 | /** | |
06c63f93 | 1034 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1035 | * @rdev: regulator source |
40f9244f | 1036 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1037 | * @supply: symbolic name for supply |
a5766f11 LG |
1038 | * |
1039 | * Allows platform initialisation code to map physical regulator | |
1040 | * sources to symbolic names for supplies for use by devices. Devices | |
1041 | * should use these symbolic names to request regulators, avoiding the | |
1042 | * need to provide board-specific regulator names as platform data. | |
1043 | */ | |
1044 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1045 | const char *consumer_dev_name, |
1046 | const char *supply) | |
a5766f11 LG |
1047 | { |
1048 | struct regulator_map *node; | |
9ed2099e | 1049 | int has_dev; |
a5766f11 LG |
1050 | |
1051 | if (supply == NULL) | |
1052 | return -EINVAL; | |
1053 | ||
9ed2099e MB |
1054 | if (consumer_dev_name != NULL) |
1055 | has_dev = 1; | |
1056 | else | |
1057 | has_dev = 0; | |
1058 | ||
6001e13c | 1059 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1060 | if (node->dev_name && consumer_dev_name) { |
1061 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1062 | continue; | |
1063 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1064 | continue; |
23b5cc2a JN |
1065 | } |
1066 | ||
6001e13c DB |
1067 | if (strcmp(node->supply, supply) != 0) |
1068 | continue; | |
1069 | ||
737f360d MB |
1070 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1071 | consumer_dev_name, | |
1072 | dev_name(&node->regulator->dev), | |
1073 | node->regulator->desc->name, | |
1074 | supply, | |
1075 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1076 | return -EBUSY; |
1077 | } | |
1078 | ||
9ed2099e | 1079 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1080 | if (node == NULL) |
1081 | return -ENOMEM; | |
1082 | ||
1083 | node->regulator = rdev; | |
a5766f11 LG |
1084 | node->supply = supply; |
1085 | ||
9ed2099e MB |
1086 | if (has_dev) { |
1087 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1088 | if (node->dev_name == NULL) { | |
1089 | kfree(node); | |
1090 | return -ENOMEM; | |
1091 | } | |
40f9244f MB |
1092 | } |
1093 | ||
a5766f11 LG |
1094 | list_add(&node->list, ®ulator_map_list); |
1095 | return 0; | |
1096 | } | |
1097 | ||
0f1d747b MR |
1098 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1099 | { | |
1100 | struct regulator_map *node, *n; | |
1101 | ||
1102 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1103 | if (rdev == node->regulator) { | |
1104 | list_del(&node->list); | |
40f9244f | 1105 | kfree(node->dev_name); |
0f1d747b | 1106 | kfree(node); |
0f1d747b MR |
1107 | } |
1108 | } | |
1109 | } | |
1110 | ||
f5726ae3 | 1111 | #define REG_STR_SIZE 64 |
414c70cb LG |
1112 | |
1113 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1114 | struct device *dev, | |
1115 | const char *supply_name) | |
1116 | { | |
1117 | struct regulator *regulator; | |
1118 | char buf[REG_STR_SIZE]; | |
1119 | int err, size; | |
1120 | ||
1121 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1122 | if (regulator == NULL) | |
1123 | return NULL; | |
1124 | ||
1125 | mutex_lock(&rdev->mutex); | |
1126 | regulator->rdev = rdev; | |
1127 | list_add(®ulator->list, &rdev->consumer_list); | |
1128 | ||
1129 | if (dev) { | |
e2c98eaf SG |
1130 | regulator->dev = dev; |
1131 | ||
222cc7b1 | 1132 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1133 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1134 | dev->kobj.name, supply_name); | |
1135 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1136 | goto overflow_err; |
414c70cb LG |
1137 | |
1138 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1139 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1140 | goto overflow_err; |
414c70cb LG |
1141 | |
1142 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1143 | buf); | |
1144 | if (err) { | |
5da84fd9 JP |
1145 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1146 | dev->kobj.name, err); | |
222cc7b1 | 1147 | /* non-fatal */ |
414c70cb | 1148 | } |
5de70519 MB |
1149 | } else { |
1150 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1151 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1152 | goto overflow_err; |
5de70519 MB |
1153 | } |
1154 | ||
5de70519 MB |
1155 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1156 | rdev->debugfs); | |
24751434 | 1157 | if (!regulator->debugfs) { |
5de70519 | 1158 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1159 | } else { |
1160 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1161 | ®ulator->uA_load); | |
1162 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1163 | ®ulator->min_uV); | |
1164 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1165 | ®ulator->max_uV); | |
414c70cb | 1166 | } |
5de70519 | 1167 | |
6492bc1b MB |
1168 | /* |
1169 | * Check now if the regulator is an always on regulator - if | |
1170 | * it is then we don't need to do nearly so much work for | |
1171 | * enable/disable calls. | |
1172 | */ | |
1173 | if (!_regulator_can_change_status(rdev) && | |
1174 | _regulator_is_enabled(rdev)) | |
1175 | regulator->always_on = true; | |
1176 | ||
414c70cb LG |
1177 | mutex_unlock(&rdev->mutex); |
1178 | return regulator; | |
414c70cb LG |
1179 | overflow_err: |
1180 | list_del(®ulator->list); | |
1181 | kfree(regulator); | |
1182 | mutex_unlock(&rdev->mutex); | |
1183 | return NULL; | |
1184 | } | |
1185 | ||
31aae2be MB |
1186 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1187 | { | |
1188 | if (!rdev->desc->ops->enable_time) | |
79511ed3 | 1189 | return rdev->desc->enable_time; |
31aae2be MB |
1190 | return rdev->desc->ops->enable_time(rdev); |
1191 | } | |
1192 | ||
69511a45 | 1193 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1194 | const char *supply, |
1195 | int *ret) | |
69511a45 RN |
1196 | { |
1197 | struct regulator_dev *r; | |
1198 | struct device_node *node; | |
576ca436 MB |
1199 | struct regulator_map *map; |
1200 | const char *devname = NULL; | |
69511a45 RN |
1201 | |
1202 | /* first do a dt based lookup */ | |
1203 | if (dev && dev->of_node) { | |
1204 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1205 | if (node) { |
69511a45 RN |
1206 | list_for_each_entry(r, ®ulator_list, list) |
1207 | if (r->dev.parent && | |
1208 | node == r->dev.of_node) | |
1209 | return r; | |
6d191a5f MB |
1210 | } else { |
1211 | /* | |
1212 | * If we couldn't even get the node then it's | |
1213 | * not just that the device didn't register | |
1214 | * yet, there's no node and we'll never | |
1215 | * succeed. | |
1216 | */ | |
1217 | *ret = -ENODEV; | |
1218 | } | |
69511a45 RN |
1219 | } |
1220 | ||
1221 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1222 | if (dev) |
1223 | devname = dev_name(dev); | |
1224 | ||
69511a45 RN |
1225 | list_for_each_entry(r, ®ulator_list, list) |
1226 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1227 | return r; | |
1228 | ||
576ca436 MB |
1229 | list_for_each_entry(map, ®ulator_map_list, list) { |
1230 | /* If the mapping has a device set up it must match */ | |
1231 | if (map->dev_name && | |
1232 | (!devname || strcmp(map->dev_name, devname))) | |
1233 | continue; | |
1234 | ||
1235 | if (strcmp(map->supply, supply) == 0) | |
1236 | return map->regulator; | |
1237 | } | |
1238 | ||
1239 | ||
69511a45 RN |
1240 | return NULL; |
1241 | } | |
1242 | ||
5ffbd136 MB |
1243 | /* Internal regulator request function */ |
1244 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1245 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1246 | { |
1247 | struct regulator_dev *rdev; | |
04bf3011 | 1248 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1249 | const char *devname = NULL; |
9b92da1f | 1250 | int ret = -EPROBE_DEFER; |
414c70cb LG |
1251 | |
1252 | if (id == NULL) { | |
5da84fd9 | 1253 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1254 | return regulator; |
1255 | } | |
1256 | ||
40f9244f MB |
1257 | if (dev) |
1258 | devname = dev_name(dev); | |
1259 | ||
414c70cb LG |
1260 | mutex_lock(®ulator_list_mutex); |
1261 | ||
6d191a5f | 1262 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1263 | if (rdev) |
1264 | goto found; | |
1265 | ||
1e4b545c NM |
1266 | /* |
1267 | * If we have return value from dev_lookup fail, we do not expect to | |
1268 | * succeed, so, quit with appropriate error value | |
1269 | */ | |
4ddfebd3 | 1270 | if (ret && ret != -ENODEV) { |
1e4b545c NM |
1271 | regulator = ERR_PTR(ret); |
1272 | goto out; | |
1273 | } | |
1274 | ||
34abbd68 MB |
1275 | if (!devname) |
1276 | devname = "deviceless"; | |
1277 | ||
4ddfebd3 MB |
1278 | /* |
1279 | * Assume that a regulator is physically present and enabled | |
1280 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1281 | */ |
4ddfebd3 MB |
1282 | if (has_full_constraints && allow_dummy) { |
1283 | /* | |
1284 | * Log the substitution if regulator configuration is | |
1285 | * not complete to help development. | |
1286 | */ | |
1287 | if (!has_full_constraints) | |
1288 | pr_warn("%s supply %s not found, using dummy regulator\n", | |
1289 | devname, id); | |
1290 | ||
34abbd68 MB |
1291 | rdev = dummy_regulator_rdev; |
1292 | goto found; | |
4ddfebd3 MB |
1293 | } else { |
1294 | dev_err(dev, "dummy supplies not allowed\n"); | |
34abbd68 | 1295 | } |
34abbd68 | 1296 | |
414c70cb LG |
1297 | mutex_unlock(®ulator_list_mutex); |
1298 | return regulator; | |
1299 | ||
1300 | found: | |
5ffbd136 MB |
1301 | if (rdev->exclusive) { |
1302 | regulator = ERR_PTR(-EPERM); | |
1303 | goto out; | |
1304 | } | |
1305 | ||
1306 | if (exclusive && rdev->open_count) { | |
1307 | regulator = ERR_PTR(-EBUSY); | |
1308 | goto out; | |
1309 | } | |
1310 | ||
a5766f11 LG |
1311 | if (!try_module_get(rdev->owner)) |
1312 | goto out; | |
1313 | ||
414c70cb LG |
1314 | regulator = create_regulator(rdev, dev, id); |
1315 | if (regulator == NULL) { | |
1316 | regulator = ERR_PTR(-ENOMEM); | |
1317 | module_put(rdev->owner); | |
bcda4321 | 1318 | goto out; |
414c70cb LG |
1319 | } |
1320 | ||
5ffbd136 MB |
1321 | rdev->open_count++; |
1322 | if (exclusive) { | |
1323 | rdev->exclusive = 1; | |
1324 | ||
1325 | ret = _regulator_is_enabled(rdev); | |
1326 | if (ret > 0) | |
1327 | rdev->use_count = 1; | |
1328 | else | |
1329 | rdev->use_count = 0; | |
1330 | } | |
1331 | ||
a5766f11 | 1332 | out: |
414c70cb | 1333 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1334 | |
414c70cb LG |
1335 | return regulator; |
1336 | } | |
5ffbd136 MB |
1337 | |
1338 | /** | |
1339 | * regulator_get - lookup and obtain a reference to a regulator. | |
1340 | * @dev: device for regulator "consumer" | |
1341 | * @id: Supply name or regulator ID. | |
1342 | * | |
1343 | * Returns a struct regulator corresponding to the regulator producer, | |
1344 | * or IS_ERR() condition containing errno. | |
1345 | * | |
1346 | * Use of supply names configured via regulator_set_device_supply() is | |
1347 | * strongly encouraged. It is recommended that the supply name used | |
1348 | * should match the name used for the supply and/or the relevant | |
1349 | * device pins in the datasheet. | |
1350 | */ | |
1351 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1352 | { | |
4ddfebd3 | 1353 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1354 | } |
414c70cb LG |
1355 | EXPORT_SYMBOL_GPL(regulator_get); |
1356 | ||
070b9079 SB |
1357 | static void devm_regulator_release(struct device *dev, void *res) |
1358 | { | |
1359 | regulator_put(*(struct regulator **)res); | |
1360 | } | |
1361 | ||
1362 | /** | |
1363 | * devm_regulator_get - Resource managed regulator_get() | |
1364 | * @dev: device for regulator "consumer" | |
1365 | * @id: Supply name or regulator ID. | |
1366 | * | |
1367 | * Managed regulator_get(). Regulators returned from this function are | |
1368 | * automatically regulator_put() on driver detach. See regulator_get() for more | |
1369 | * information. | |
1370 | */ | |
1371 | struct regulator *devm_regulator_get(struct device *dev, const char *id) | |
1372 | { | |
1373 | struct regulator **ptr, *regulator; | |
1374 | ||
1375 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1376 | if (!ptr) | |
1377 | return ERR_PTR(-ENOMEM); | |
1378 | ||
1379 | regulator = regulator_get(dev, id); | |
1380 | if (!IS_ERR(regulator)) { | |
1381 | *ptr = regulator; | |
1382 | devres_add(dev, ptr); | |
1383 | } else { | |
1384 | devres_free(ptr); | |
1385 | } | |
1386 | ||
1387 | return regulator; | |
1388 | } | |
1389 | EXPORT_SYMBOL_GPL(devm_regulator_get); | |
1390 | ||
5ffbd136 MB |
1391 | /** |
1392 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1393 | * @dev: device for regulator "consumer" | |
1394 | * @id: Supply name or regulator ID. | |
1395 | * | |
1396 | * Returns a struct regulator corresponding to the regulator producer, | |
1397 | * or IS_ERR() condition containing errno. Other consumers will be | |
1398 | * unable to obtain this reference is held and the use count for the | |
1399 | * regulator will be initialised to reflect the current state of the | |
1400 | * regulator. | |
1401 | * | |
1402 | * This is intended for use by consumers which cannot tolerate shared | |
1403 | * use of the regulator such as those which need to force the | |
1404 | * regulator off for correct operation of the hardware they are | |
1405 | * controlling. | |
1406 | * | |
1407 | * Use of supply names configured via regulator_set_device_supply() is | |
1408 | * strongly encouraged. It is recommended that the supply name used | |
1409 | * should match the name used for the supply and/or the relevant | |
1410 | * device pins in the datasheet. | |
1411 | */ | |
1412 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1413 | { | |
4ddfebd3 | 1414 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1415 | } |
1416 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1417 | ||
de1dd9fd MB |
1418 | /** |
1419 | * regulator_get_optional - obtain optional access to a regulator. | |
1420 | * @dev: device for regulator "consumer" | |
1421 | * @id: Supply name or regulator ID. | |
1422 | * | |
1423 | * Returns a struct regulator corresponding to the regulator producer, | |
1424 | * or IS_ERR() condition containing errno. Other consumers will be | |
1425 | * unable to obtain this reference is held and the use count for the | |
1426 | * regulator will be initialised to reflect the current state of the | |
1427 | * regulator. | |
1428 | * | |
1429 | * This is intended for use by consumers for devices which can have | |
1430 | * some supplies unconnected in normal use, such as some MMC devices. | |
1431 | * It can allow the regulator core to provide stub supplies for other | |
1432 | * supplies requested using normal regulator_get() calls without | |
1433 | * disrupting the operation of drivers that can handle absent | |
1434 | * supplies. | |
1435 | * | |
1436 | * Use of supply names configured via regulator_set_device_supply() is | |
1437 | * strongly encouraged. It is recommended that the supply name used | |
1438 | * should match the name used for the supply and/or the relevant | |
1439 | * device pins in the datasheet. | |
1440 | */ | |
1441 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1442 | { | |
4ddfebd3 | 1443 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1444 | } |
1445 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1446 | ||
1447 | /** | |
1448 | * devm_regulator_get_optional - Resource managed regulator_get_optional() | |
1449 | * @dev: device for regulator "consumer" | |
1450 | * @id: Supply name or regulator ID. | |
1451 | * | |
1452 | * Managed regulator_get_optional(). Regulators returned from this | |
1453 | * function are automatically regulator_put() on driver detach. See | |
1454 | * regulator_get_optional() for more information. | |
1455 | */ | |
1456 | struct regulator *devm_regulator_get_optional(struct device *dev, | |
1457 | const char *id) | |
1458 | { | |
1459 | struct regulator **ptr, *regulator; | |
1460 | ||
1461 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1462 | if (!ptr) | |
1463 | return ERR_PTR(-ENOMEM); | |
1464 | ||
1465 | regulator = regulator_get_optional(dev, id); | |
1466 | if (!IS_ERR(regulator)) { | |
1467 | *ptr = regulator; | |
1468 | devres_add(dev, ptr); | |
1469 | } else { | |
1470 | devres_free(ptr); | |
1471 | } | |
1472 | ||
1473 | return regulator; | |
1474 | } | |
1475 | EXPORT_SYMBOL_GPL(devm_regulator_get_optional); | |
1476 | ||
23ff2f0f CK |
1477 | /* Locks held by regulator_put() */ |
1478 | static void _regulator_put(struct regulator *regulator) | |
414c70cb LG |
1479 | { |
1480 | struct regulator_dev *rdev; | |
1481 | ||
1482 | if (regulator == NULL || IS_ERR(regulator)) | |
1483 | return; | |
1484 | ||
414c70cb LG |
1485 | rdev = regulator->rdev; |
1486 | ||
5de70519 | 1487 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1488 | |
414c70cb | 1489 | /* remove any sysfs entries */ |
e2c98eaf | 1490 | if (regulator->dev) |
414c70cb | 1491 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
5de70519 | 1492 | kfree(regulator->supply_name); |
414c70cb LG |
1493 | list_del(®ulator->list); |
1494 | kfree(regulator); | |
1495 | ||
5ffbd136 MB |
1496 | rdev->open_count--; |
1497 | rdev->exclusive = 0; | |
1498 | ||
414c70cb | 1499 | module_put(rdev->owner); |
23ff2f0f CK |
1500 | } |
1501 | ||
9efdd276 MK |
1502 | /** |
1503 | * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive() | |
1504 | * @dev: device for regulator "consumer" | |
1505 | * @id: Supply name or regulator ID. | |
1506 | * | |
1507 | * Managed regulator_get_exclusive(). Regulators returned from this function | |
1508 | * are automatically regulator_put() on driver detach. See regulator_get() for | |
1509 | * more information. | |
1510 | */ | |
1511 | struct regulator *devm_regulator_get_exclusive(struct device *dev, | |
1512 | const char *id) | |
1513 | { | |
1514 | struct regulator **ptr, *regulator; | |
1515 | ||
1516 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1517 | if (!ptr) | |
1518 | return ERR_PTR(-ENOMEM); | |
1519 | ||
1520 | regulator = _regulator_get(dev, id, 1); | |
1521 | if (!IS_ERR(regulator)) { | |
1522 | *ptr = regulator; | |
1523 | devres_add(dev, ptr); | |
1524 | } else { | |
1525 | devres_free(ptr); | |
1526 | } | |
1527 | ||
1528 | return regulator; | |
1529 | } | |
1530 | EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive); | |
1531 | ||
23ff2f0f CK |
1532 | /** |
1533 | * regulator_put - "free" the regulator source | |
1534 | * @regulator: regulator source | |
1535 | * | |
1536 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1537 | * regulator source are balanced by regulator_disable calls prior to calling | |
1538 | * this function. | |
1539 | */ | |
1540 | void regulator_put(struct regulator *regulator) | |
1541 | { | |
1542 | mutex_lock(®ulator_list_mutex); | |
1543 | _regulator_put(regulator); | |
414c70cb LG |
1544 | mutex_unlock(®ulator_list_mutex); |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(regulator_put); | |
1547 | ||
d5ad34f7 MB |
1548 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1549 | { | |
1550 | struct regulator **r = res; | |
1551 | if (!r || !*r) { | |
1552 | WARN_ON(!r || !*r); | |
1553 | return 0; | |
1554 | } | |
1555 | return *r == data; | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * devm_regulator_put - Resource managed regulator_put() | |
1560 | * @regulator: regulator to free | |
1561 | * | |
1562 | * Deallocate a regulator allocated with devm_regulator_get(). Normally | |
1563 | * this function will not need to be called and the resource management | |
1564 | * code will ensure that the resource is freed. | |
1565 | */ | |
1566 | void devm_regulator_put(struct regulator *regulator) | |
1567 | { | |
1568 | int rc; | |
1569 | ||
361ff501 | 1570 | rc = devres_release(regulator->dev, devm_regulator_release, |
d5ad34f7 | 1571 | devm_regulator_match, regulator); |
230a5a1c | 1572 | if (rc != 0) |
968c2c17 | 1573 | WARN_ON(rc); |
d5ad34f7 MB |
1574 | } |
1575 | EXPORT_SYMBOL_GPL(devm_regulator_put); | |
1576 | ||
f19b00da KM |
1577 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1578 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1579 | const struct regulator_config *config) | |
1580 | { | |
1581 | struct regulator_enable_gpio *pin; | |
1582 | int ret; | |
1583 | ||
1584 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { | |
1585 | if (pin->gpio == config->ena_gpio) { | |
1586 | rdev_dbg(rdev, "GPIO %d is already used\n", | |
1587 | config->ena_gpio); | |
1588 | goto update_ena_gpio_to_rdev; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | ret = gpio_request_one(config->ena_gpio, | |
1593 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1594 | rdev_get_name(rdev)); | |
1595 | if (ret) | |
1596 | return ret; | |
1597 | ||
1598 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1599 | if (pin == NULL) { | |
1600 | gpio_free(config->ena_gpio); | |
1601 | return -ENOMEM; | |
1602 | } | |
1603 | ||
1604 | pin->gpio = config->ena_gpio; | |
1605 | pin->ena_gpio_invert = config->ena_gpio_invert; | |
1606 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1607 | ||
1608 | update_ena_gpio_to_rdev: | |
1609 | pin->request_count++; | |
1610 | rdev->ena_pin = pin; | |
1611 | return 0; | |
1612 | } | |
1613 | ||
1614 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1615 | { | |
1616 | struct regulator_enable_gpio *pin, *n; | |
1617 | ||
1618 | if (!rdev->ena_pin) | |
1619 | return; | |
1620 | ||
1621 | /* Free the GPIO only in case of no use */ | |
1622 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
1623 | if (pin->gpio == rdev->ena_pin->gpio) { | |
1624 | if (pin->request_count <= 1) { | |
1625 | pin->request_count = 0; | |
1626 | gpio_free(pin->gpio); | |
1627 | list_del(&pin->list); | |
1628 | kfree(pin); | |
1629 | } else { | |
1630 | pin->request_count--; | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | } | |
1635 | ||
967cfb18 | 1636 | /** |
31d6eebf RD |
1637 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1638 | * @rdev: regulator_dev structure | |
1639 | * @enable: enable GPIO at initial use? | |
1640 | * | |
967cfb18 KM |
1641 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1642 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1643 | */ | |
1644 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1645 | { | |
1646 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1647 | ||
1648 | if (!pin) | |
1649 | return -EINVAL; | |
1650 | ||
1651 | if (enable) { | |
1652 | /* Enable GPIO at initial use */ | |
1653 | if (pin->enable_count == 0) | |
1654 | gpio_set_value_cansleep(pin->gpio, | |
1655 | !pin->ena_gpio_invert); | |
1656 | ||
1657 | pin->enable_count++; | |
1658 | } else { | |
1659 | if (pin->enable_count > 1) { | |
1660 | pin->enable_count--; | |
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | /* Disable GPIO if not used */ | |
1665 | if (pin->enable_count <= 1) { | |
1666 | gpio_set_value_cansleep(pin->gpio, | |
1667 | pin->ena_gpio_invert); | |
1668 | pin->enable_count = 0; | |
1669 | } | |
1670 | } | |
1671 | ||
1672 | return 0; | |
1673 | } | |
1674 | ||
5c5659d0 MB |
1675 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1676 | { | |
1677 | int ret, delay; | |
1678 | ||
1679 | /* Query before enabling in case configuration dependent. */ | |
1680 | ret = _regulator_get_enable_time(rdev); | |
1681 | if (ret >= 0) { | |
1682 | delay = ret; | |
1683 | } else { | |
1684 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1685 | delay = 0; | |
1686 | } | |
1687 | ||
1688 | trace_regulator_enable(rdev_get_name(rdev)); | |
1689 | ||
967cfb18 KM |
1690 | if (rdev->ena_pin) { |
1691 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1692 | if (ret < 0) | |
1693 | return ret; | |
65f73508 MB |
1694 | rdev->ena_gpio_state = 1; |
1695 | } else if (rdev->desc->ops->enable) { | |
5c5659d0 MB |
1696 | ret = rdev->desc->ops->enable(rdev); |
1697 | if (ret < 0) | |
1698 | return ret; | |
1699 | } else { | |
1700 | return -EINVAL; | |
1701 | } | |
1702 | ||
1703 | /* Allow the regulator to ramp; it would be useful to extend | |
1704 | * this for bulk operations so that the regulators can ramp | |
1705 | * together. */ | |
1706 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1707 | ||
1708 | if (delay >= 1000) { | |
1709 | mdelay(delay / 1000); | |
1710 | udelay(delay % 1000); | |
1711 | } else if (delay) { | |
1712 | udelay(delay); | |
1713 | } | |
1714 | ||
1715 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1716 | ||
1717 | return 0; | |
1718 | } | |
1719 | ||
414c70cb LG |
1720 | /* locks held by regulator_enable() */ |
1721 | static int _regulator_enable(struct regulator_dev *rdev) | |
1722 | { | |
5c5659d0 | 1723 | int ret; |
414c70cb | 1724 | |
414c70cb | 1725 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1726 | if (rdev->constraints && |
1727 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1728 | drms_uA_update(rdev); | |
414c70cb | 1729 | |
9a2372fa MB |
1730 | if (rdev->use_count == 0) { |
1731 | /* The regulator may on if it's not switchable or left on */ | |
1732 | ret = _regulator_is_enabled(rdev); | |
1733 | if (ret == -EINVAL || ret == 0) { | |
1734 | if (!_regulator_can_change_status(rdev)) | |
1735 | return -EPERM; | |
1736 | ||
5c5659d0 | 1737 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1738 | if (ret < 0) |
1739 | return ret; | |
1740 | ||
a7433cff | 1741 | } else if (ret < 0) { |
5da84fd9 | 1742 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1743 | return ret; |
1744 | } | |
a7433cff | 1745 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1746 | } |
1747 | ||
9a2372fa MB |
1748 | rdev->use_count++; |
1749 | ||
1750 | return 0; | |
414c70cb LG |
1751 | } |
1752 | ||
1753 | /** | |
1754 | * regulator_enable - enable regulator output | |
1755 | * @regulator: regulator source | |
1756 | * | |
cf7bbcdf MB |
1757 | * Request that the regulator be enabled with the regulator output at |
1758 | * the predefined voltage or current value. Calls to regulator_enable() | |
1759 | * must be balanced with calls to regulator_disable(). | |
1760 | * | |
414c70cb | 1761 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1762 | * hardwired in the regulator. |
414c70cb LG |
1763 | */ |
1764 | int regulator_enable(struct regulator *regulator) | |
1765 | { | |
412aec61 DB |
1766 | struct regulator_dev *rdev = regulator->rdev; |
1767 | int ret = 0; | |
414c70cb | 1768 | |
6492bc1b MB |
1769 | if (regulator->always_on) |
1770 | return 0; | |
1771 | ||
3801b86a MB |
1772 | if (rdev->supply) { |
1773 | ret = regulator_enable(rdev->supply); | |
1774 | if (ret != 0) | |
1775 | return ret; | |
1776 | } | |
1777 | ||
412aec61 | 1778 | mutex_lock(&rdev->mutex); |
cd94b505 | 1779 | ret = _regulator_enable(rdev); |
412aec61 | 1780 | mutex_unlock(&rdev->mutex); |
3801b86a | 1781 | |
d1685e4e | 1782 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1783 | regulator_disable(rdev->supply); |
1784 | ||
414c70cb LG |
1785 | return ret; |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1788 | ||
5c5659d0 MB |
1789 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1790 | { | |
1791 | int ret; | |
1792 | ||
1793 | trace_regulator_disable(rdev_get_name(rdev)); | |
1794 | ||
967cfb18 KM |
1795 | if (rdev->ena_pin) { |
1796 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
1797 | if (ret < 0) | |
1798 | return ret; | |
5c5659d0 MB |
1799 | rdev->ena_gpio_state = 0; |
1800 | ||
1801 | } else if (rdev->desc->ops->disable) { | |
1802 | ret = rdev->desc->ops->disable(rdev); | |
1803 | if (ret != 0) | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1807 | trace_regulator_disable_complete(rdev_get_name(rdev)); | |
1808 | ||
1809 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1810 | NULL); | |
1811 | return 0; | |
1812 | } | |
1813 | ||
414c70cb | 1814 | /* locks held by regulator_disable() */ |
3801b86a | 1815 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1816 | { |
1817 | int ret = 0; | |
1818 | ||
cd94b505 | 1819 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1820 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1821 | return -EIO; |
1822 | ||
414c70cb | 1823 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1824 | if (rdev->use_count == 1 && |
1825 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1826 | |
1827 | /* we are last user */ | |
5c5659d0 MB |
1828 | if (_regulator_can_change_status(rdev)) { |
1829 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1830 | if (ret < 0) { |
5da84fd9 | 1831 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1832 | return ret; |
1833 | } | |
1834 | } | |
1835 | ||
414c70cb LG |
1836 | rdev->use_count = 0; |
1837 | } else if (rdev->use_count > 1) { | |
1838 | ||
1839 | if (rdev->constraints && | |
1840 | (rdev->constraints->valid_ops_mask & | |
1841 | REGULATOR_CHANGE_DRMS)) | |
1842 | drms_uA_update(rdev); | |
1843 | ||
1844 | rdev->use_count--; | |
1845 | } | |
3801b86a | 1846 | |
414c70cb LG |
1847 | return ret; |
1848 | } | |
1849 | ||
1850 | /** | |
1851 | * regulator_disable - disable regulator output | |
1852 | * @regulator: regulator source | |
1853 | * | |
cf7bbcdf MB |
1854 | * Disable the regulator output voltage or current. Calls to |
1855 | * regulator_enable() must be balanced with calls to | |
1856 | * regulator_disable(). | |
69279fb9 | 1857 | * |
414c70cb | 1858 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1859 | * devices have it enabled, the regulator device supports disabling and |
1860 | * machine constraints permit this operation. | |
414c70cb LG |
1861 | */ |
1862 | int regulator_disable(struct regulator *regulator) | |
1863 | { | |
412aec61 DB |
1864 | struct regulator_dev *rdev = regulator->rdev; |
1865 | int ret = 0; | |
414c70cb | 1866 | |
6492bc1b MB |
1867 | if (regulator->always_on) |
1868 | return 0; | |
1869 | ||
412aec61 | 1870 | mutex_lock(&rdev->mutex); |
3801b86a | 1871 | ret = _regulator_disable(rdev); |
412aec61 | 1872 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1873 | |
3801b86a MB |
1874 | if (ret == 0 && rdev->supply) |
1875 | regulator_disable(rdev->supply); | |
8cbf811d | 1876 | |
414c70cb LG |
1877 | return ret; |
1878 | } | |
1879 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1880 | ||
1881 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1882 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1883 | { |
1884 | int ret = 0; | |
1885 | ||
1886 | /* force disable */ | |
1887 | if (rdev->desc->ops->disable) { | |
1888 | /* ah well, who wants to live forever... */ | |
1889 | ret = rdev->desc->ops->disable(rdev); | |
1890 | if (ret < 0) { | |
5da84fd9 | 1891 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1892 | return ret; |
1893 | } | |
1894 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1895 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1896 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1897 | } |
1898 | ||
414c70cb LG |
1899 | return ret; |
1900 | } | |
1901 | ||
1902 | /** | |
1903 | * regulator_force_disable - force disable regulator output | |
1904 | * @regulator: regulator source | |
1905 | * | |
1906 | * Forcibly disable the regulator output voltage or current. | |
1907 | * NOTE: this *will* disable the regulator output even if other consumer | |
1908 | * devices have it enabled. This should be used for situations when device | |
1909 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1910 | */ | |
1911 | int regulator_force_disable(struct regulator *regulator) | |
1912 | { | |
82d15839 | 1913 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1914 | int ret; |
1915 | ||
82d15839 | 1916 | mutex_lock(&rdev->mutex); |
414c70cb | 1917 | regulator->uA_load = 0; |
3801b86a | 1918 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1919 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1920 | |
3801b86a MB |
1921 | if (rdev->supply) |
1922 | while (rdev->open_count--) | |
1923 | regulator_disable(rdev->supply); | |
8cbf811d | 1924 | |
414c70cb LG |
1925 | return ret; |
1926 | } | |
1927 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1928 | ||
da07ecd9 MB |
1929 | static void regulator_disable_work(struct work_struct *work) |
1930 | { | |
1931 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1932 | disable_work.work); | |
1933 | int count, i, ret; | |
1934 | ||
1935 | mutex_lock(&rdev->mutex); | |
1936 | ||
1937 | BUG_ON(!rdev->deferred_disables); | |
1938 | ||
1939 | count = rdev->deferred_disables; | |
1940 | rdev->deferred_disables = 0; | |
1941 | ||
1942 | for (i = 0; i < count; i++) { | |
1943 | ret = _regulator_disable(rdev); | |
1944 | if (ret != 0) | |
1945 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1946 | } | |
1947 | ||
1948 | mutex_unlock(&rdev->mutex); | |
1949 | ||
1950 | if (rdev->supply) { | |
1951 | for (i = 0; i < count; i++) { | |
1952 | ret = regulator_disable(rdev->supply); | |
1953 | if (ret != 0) { | |
1954 | rdev_err(rdev, | |
1955 | "Supply disable failed: %d\n", ret); | |
1956 | } | |
1957 | } | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | /** | |
1962 | * regulator_disable_deferred - disable regulator output with delay | |
1963 | * @regulator: regulator source | |
1964 | * @ms: miliseconds until the regulator is disabled | |
1965 | * | |
1966 | * Execute regulator_disable() on the regulator after a delay. This | |
1967 | * is intended for use with devices that require some time to quiesce. | |
1968 | * | |
1969 | * NOTE: this will only disable the regulator output if no other consumer | |
1970 | * devices have it enabled, the regulator device supports disabling and | |
1971 | * machine constraints permit this operation. | |
1972 | */ | |
1973 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1974 | { | |
1975 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1976 | int ret; |
da07ecd9 | 1977 | |
6492bc1b MB |
1978 | if (regulator->always_on) |
1979 | return 0; | |
1980 | ||
2b5a24a0 MB |
1981 | if (!ms) |
1982 | return regulator_disable(regulator); | |
1983 | ||
da07ecd9 MB |
1984 | mutex_lock(&rdev->mutex); |
1985 | rdev->deferred_disables++; | |
1986 | mutex_unlock(&rdev->mutex); | |
1987 | ||
070260f0 MB |
1988 | ret = queue_delayed_work(system_power_efficient_wq, |
1989 | &rdev->disable_work, | |
1990 | msecs_to_jiffies(ms)); | |
aa59802d MB |
1991 | if (ret < 0) |
1992 | return ret; | |
1993 | else | |
1994 | return 0; | |
da07ecd9 MB |
1995 | } |
1996 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1997 | ||
414c70cb LG |
1998 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1999 | { | |
65f73508 | 2000 | /* A GPIO control always takes precedence */ |
7b74d149 | 2001 | if (rdev->ena_pin) |
65f73508 MB |
2002 | return rdev->ena_gpio_state; |
2003 | ||
9a7f6a4c | 2004 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2005 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2006 | return 1; |
414c70cb | 2007 | |
9332546f | 2008 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2009 | } |
2010 | ||
2011 | /** | |
2012 | * regulator_is_enabled - is the regulator output enabled | |
2013 | * @regulator: regulator source | |
2014 | * | |
412aec61 DB |
2015 | * Returns positive if the regulator driver backing the source/client |
2016 | * has requested that the device be enabled, zero if it hasn't, else a | |
2017 | * negative errno code. | |
2018 | * | |
2019 | * Note that the device backing this regulator handle can have multiple | |
2020 | * users, so it might be enabled even if regulator_enable() was never | |
2021 | * called for this particular source. | |
414c70cb LG |
2022 | */ |
2023 | int regulator_is_enabled(struct regulator *regulator) | |
2024 | { | |
9332546f MB |
2025 | int ret; |
2026 | ||
6492bc1b MB |
2027 | if (regulator->always_on) |
2028 | return 1; | |
2029 | ||
9332546f MB |
2030 | mutex_lock(®ulator->rdev->mutex); |
2031 | ret = _regulator_is_enabled(regulator->rdev); | |
2032 | mutex_unlock(®ulator->rdev->mutex); | |
2033 | ||
2034 | return ret; | |
414c70cb LG |
2035 | } |
2036 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2037 | ||
d1e7de30 MS |
2038 | /** |
2039 | * regulator_can_change_voltage - check if regulator can change voltage | |
2040 | * @regulator: regulator source | |
2041 | * | |
2042 | * Returns positive if the regulator driver backing the source/client | |
2043 | * can change its voltage, false otherwise. Usefull for detecting fixed | |
2044 | * or dummy regulators and disabling voltage change logic in the client | |
2045 | * driver. | |
2046 | */ | |
2047 | int regulator_can_change_voltage(struct regulator *regulator) | |
2048 | { | |
2049 | struct regulator_dev *rdev = regulator->rdev; | |
2050 | ||
2051 | if (rdev->constraints && | |
19280e40 AL |
2052 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2053 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2054 | return 1; | |
2055 | ||
2056 | if (rdev->desc->continuous_voltage_range && | |
2057 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2058 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2059 | return 1; | |
2060 | } | |
d1e7de30 MS |
2061 | |
2062 | return 0; | |
2063 | } | |
2064 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2065 | ||
4367cfdc DB |
2066 | /** |
2067 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2068 | * @regulator: regulator source | |
2069 | * | |
2070 | * Returns number of selectors, or negative errno. Selectors are | |
2071 | * numbered starting at zero, and typically correspond to bitfields | |
2072 | * in hardware registers. | |
2073 | */ | |
2074 | int regulator_count_voltages(struct regulator *regulator) | |
2075 | { | |
2076 | struct regulator_dev *rdev = regulator->rdev; | |
2077 | ||
2078 | return rdev->desc->n_voltages ? : -EINVAL; | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2081 | ||
2082 | /** | |
2083 | * regulator_list_voltage - enumerate supported voltages | |
2084 | * @regulator: regulator source | |
2085 | * @selector: identify voltage to list | |
2086 | * Context: can sleep | |
2087 | * | |
2088 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2089 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2090 | * negative errno. |
2091 | */ | |
2092 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2093 | { | |
2094 | struct regulator_dev *rdev = regulator->rdev; | |
2095 | struct regulator_ops *ops = rdev->desc->ops; | |
2096 | int ret; | |
2097 | ||
2098 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
2099 | return -EINVAL; | |
2100 | ||
2101 | mutex_lock(&rdev->mutex); | |
2102 | ret = ops->list_voltage(rdev, selector); | |
2103 | mutex_unlock(&rdev->mutex); | |
2104 | ||
2105 | if (ret > 0) { | |
2106 | if (ret < rdev->constraints->min_uV) | |
2107 | ret = 0; | |
2108 | else if (ret > rdev->constraints->max_uV) | |
2109 | ret = 0; | |
2110 | } | |
2111 | ||
2112 | return ret; | |
2113 | } | |
2114 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2115 | ||
2a668a8b PW |
2116 | /** |
2117 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2118 | * @regulator: regulator source | |
2119 | * | |
2120 | * Returns the voltage step size between VSEL values for linear | |
2121 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2122 | */ | |
2123 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2124 | { | |
2125 | struct regulator_dev *rdev = regulator->rdev; | |
2126 | ||
2127 | return rdev->desc->uV_step; | |
2128 | } | |
2129 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2130 | ||
a7a1ad90 MB |
2131 | /** |
2132 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2133 | * | |
2134 | * @regulator: Regulator to check. | |
2135 | * @min_uV: Minimum required voltage in uV. | |
2136 | * @max_uV: Maximum required voltage in uV. | |
2137 | * | |
2138 | * Returns a boolean or a negative error code. | |
2139 | */ | |
2140 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2141 | int min_uV, int max_uV) | |
2142 | { | |
c5f3939b | 2143 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2144 | int i, voltages, ret; |
2145 | ||
c5f3939b MB |
2146 | /* If we can't change voltage check the current voltage */ |
2147 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2148 | ret = regulator_get_voltage(regulator); | |
2149 | if (ret >= 0) | |
f0f98b19 | 2150 | return (min_uV <= ret && ret <= max_uV); |
c5f3939b MB |
2151 | else |
2152 | return ret; | |
2153 | } | |
2154 | ||
bd7a2b60 PM |
2155 | /* Any voltage within constrains range is fine? */ |
2156 | if (rdev->desc->continuous_voltage_range) | |
2157 | return min_uV >= rdev->constraints->min_uV && | |
2158 | max_uV <= rdev->constraints->max_uV; | |
2159 | ||
a7a1ad90 MB |
2160 | ret = regulator_count_voltages(regulator); |
2161 | if (ret < 0) | |
2162 | return ret; | |
2163 | voltages = ret; | |
2164 | ||
2165 | for (i = 0; i < voltages; i++) { | |
2166 | ret = regulator_list_voltage(regulator, i); | |
2167 | ||
2168 | if (ret >= min_uV && ret <= max_uV) | |
2169 | return 1; | |
2170 | } | |
2171 | ||
2172 | return 0; | |
2173 | } | |
a398eaa2 | 2174 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2175 | |
75790251 MB |
2176 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2177 | int min_uV, int max_uV) | |
2178 | { | |
2179 | int ret; | |
77af1b26 | 2180 | int delay = 0; |
e113d792 | 2181 | int best_val = 0; |
75790251 | 2182 | unsigned int selector; |
eba41a5e | 2183 | int old_selector = -1; |
75790251 MB |
2184 | |
2185 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2186 | ||
bf5892a8 MB |
2187 | min_uV += rdev->constraints->uV_offset; |
2188 | max_uV += rdev->constraints->uV_offset; | |
2189 | ||
eba41a5e AL |
2190 | /* |
2191 | * If we can't obtain the old selector there is not enough | |
2192 | * info to call set_voltage_time_sel(). | |
2193 | */ | |
8b7485ef AL |
2194 | if (_regulator_is_enabled(rdev) && |
2195 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2196 | rdev->desc->ops->get_voltage_sel) { |
2197 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2198 | if (old_selector < 0) | |
2199 | return old_selector; | |
2200 | } | |
2201 | ||
75790251 MB |
2202 | if (rdev->desc->ops->set_voltage) { |
2203 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2204 | &selector); | |
e113d792 MB |
2205 | |
2206 | if (ret >= 0) { | |
2207 | if (rdev->desc->ops->list_voltage) | |
2208 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2209 | selector); | |
2210 | else | |
2211 | best_val = _regulator_get_voltage(rdev); | |
2212 | } | |
2213 | ||
e8eef82b | 2214 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2215 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2216 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2217 | max_uV); | |
9152c36a AL |
2218 | } else { |
2219 | if (rdev->desc->ops->list_voltage == | |
2220 | regulator_list_voltage_linear) | |
2221 | ret = regulator_map_voltage_linear(rdev, | |
2222 | min_uV, max_uV); | |
2223 | else | |
2224 | ret = regulator_map_voltage_iterate(rdev, | |
2225 | min_uV, max_uV); | |
2226 | } | |
e8eef82b | 2227 | |
e843fc46 | 2228 | if (ret >= 0) { |
e113d792 MB |
2229 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2230 | if (min_uV <= best_val && max_uV >= best_val) { | |
2231 | selector = ret; | |
c66a566a AL |
2232 | if (old_selector == selector) |
2233 | ret = 0; | |
2234 | else | |
2235 | ret = rdev->desc->ops->set_voltage_sel( | |
2236 | rdev, ret); | |
e113d792 MB |
2237 | } else { |
2238 | ret = -EINVAL; | |
2239 | } | |
e8eef82b | 2240 | } |
75790251 MB |
2241 | } else { |
2242 | ret = -EINVAL; | |
2243 | } | |
e8eef82b | 2244 | |
eba41a5e | 2245 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2246 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2247 | && old_selector != selector) { | |
77af1b26 | 2248 | |
eba41a5e AL |
2249 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2250 | old_selector, selector); | |
2251 | if (delay < 0) { | |
2252 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2253 | delay); | |
2254 | delay = 0; | |
e8eef82b | 2255 | } |
75790251 | 2256 | |
8b96de31 PR |
2257 | /* Insert any necessary delays */ |
2258 | if (delay >= 1000) { | |
2259 | mdelay(delay / 1000); | |
2260 | udelay(delay % 1000); | |
2261 | } else if (delay) { | |
2262 | udelay(delay); | |
2263 | } | |
77af1b26 LW |
2264 | } |
2265 | ||
2f6c797f AL |
2266 | if (ret == 0 && best_val >= 0) { |
2267 | unsigned long data = best_val; | |
2268 | ||
ded06a52 | 2269 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2270 | (void *)data); |
2271 | } | |
ded06a52 | 2272 | |
eba41a5e | 2273 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2274 | |
2275 | return ret; | |
2276 | } | |
2277 | ||
414c70cb LG |
2278 | /** |
2279 | * regulator_set_voltage - set regulator output voltage | |
2280 | * @regulator: regulator source | |
2281 | * @min_uV: Minimum required voltage in uV | |
2282 | * @max_uV: Maximum acceptable voltage in uV | |
2283 | * | |
2284 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2285 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2286 | * | |
2287 | * If the regulator is enabled then the voltage will change to the new value | |
2288 | * immediately otherwise if the regulator is disabled the regulator will | |
2289 | * output at the new voltage when enabled. | |
2290 | * | |
2291 | * NOTE: If the regulator is shared between several devices then the lowest | |
2292 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2293 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2294 | * calling this function otherwise this call will fail. |
2295 | */ | |
2296 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2297 | { | |
2298 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2299 | int ret = 0; |
92d7a558 | 2300 | int old_min_uV, old_max_uV; |
414c70cb LG |
2301 | |
2302 | mutex_lock(&rdev->mutex); | |
2303 | ||
95a3c23a MB |
2304 | /* If we're setting the same range as last time the change |
2305 | * should be a noop (some cpufreq implementations use the same | |
2306 | * voltage for multiple frequencies, for example). | |
2307 | */ | |
2308 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2309 | goto out; | |
2310 | ||
414c70cb | 2311 | /* sanity check */ |
e8eef82b MB |
2312 | if (!rdev->desc->ops->set_voltage && |
2313 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2314 | ret = -EINVAL; |
2315 | goto out; | |
2316 | } | |
2317 | ||
2318 | /* constraints check */ | |
2319 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2320 | if (ret < 0) | |
2321 | goto out; | |
92d7a558 PP |
2322 | |
2323 | /* restore original values in case of error */ | |
2324 | old_min_uV = regulator->min_uV; | |
2325 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2326 | regulator->min_uV = min_uV; |
2327 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2328 | |
05fda3b1 TP |
2329 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2330 | if (ret < 0) | |
92d7a558 | 2331 | goto out2; |
05fda3b1 | 2332 | |
75790251 | 2333 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2334 | if (ret < 0) |
2335 | goto out2; | |
2336 | ||
414c70cb LG |
2337 | out: |
2338 | mutex_unlock(&rdev->mutex); | |
2339 | return ret; | |
92d7a558 PP |
2340 | out2: |
2341 | regulator->min_uV = old_min_uV; | |
2342 | regulator->max_uV = old_max_uV; | |
2343 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2344 | return ret; |
2345 | } | |
2346 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2347 | ||
88cd222b LW |
2348 | /** |
2349 | * regulator_set_voltage_time - get raise/fall time | |
2350 | * @regulator: regulator source | |
2351 | * @old_uV: starting voltage in microvolts | |
2352 | * @new_uV: target voltage in microvolts | |
2353 | * | |
2354 | * Provided with the starting and ending voltage, this function attempts to | |
2355 | * calculate the time in microseconds required to rise or fall to this new | |
2356 | * voltage. | |
2357 | */ | |
2358 | int regulator_set_voltage_time(struct regulator *regulator, | |
2359 | int old_uV, int new_uV) | |
2360 | { | |
2361 | struct regulator_dev *rdev = regulator->rdev; | |
2362 | struct regulator_ops *ops = rdev->desc->ops; | |
2363 | int old_sel = -1; | |
2364 | int new_sel = -1; | |
2365 | int voltage; | |
2366 | int i; | |
2367 | ||
2368 | /* Currently requires operations to do this */ | |
2369 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2370 | || !rdev->desc->n_voltages) | |
2371 | return -EINVAL; | |
2372 | ||
2373 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2374 | /* We only look for exact voltage matches here */ | |
2375 | voltage = regulator_list_voltage(regulator, i); | |
2376 | if (voltage < 0) | |
2377 | return -EINVAL; | |
2378 | if (voltage == 0) | |
2379 | continue; | |
2380 | if (voltage == old_uV) | |
2381 | old_sel = i; | |
2382 | if (voltage == new_uV) | |
2383 | new_sel = i; | |
2384 | } | |
2385 | ||
2386 | if (old_sel < 0 || new_sel < 0) | |
2387 | return -EINVAL; | |
2388 | ||
2389 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2390 | } | |
2391 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2392 | ||
98a175b6 | 2393 | /** |
296c6566 RD |
2394 | * regulator_set_voltage_time_sel - get raise/fall time |
2395 | * @rdev: regulator source device | |
98a175b6 YSB |
2396 | * @old_selector: selector for starting voltage |
2397 | * @new_selector: selector for target voltage | |
2398 | * | |
2399 | * Provided with the starting and target voltage selectors, this function | |
2400 | * returns time in microseconds required to rise or fall to this new voltage | |
2401 | * | |
f11d08c3 | 2402 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2403 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2404 | */ |
2405 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2406 | unsigned int old_selector, | |
2407 | unsigned int new_selector) | |
2408 | { | |
398715ab | 2409 | unsigned int ramp_delay = 0; |
f11d08c3 | 2410 | int old_volt, new_volt; |
398715ab AL |
2411 | |
2412 | if (rdev->constraints->ramp_delay) | |
2413 | ramp_delay = rdev->constraints->ramp_delay; | |
2414 | else if (rdev->desc->ramp_delay) | |
2415 | ramp_delay = rdev->desc->ramp_delay; | |
2416 | ||
2417 | if (ramp_delay == 0) { | |
6f0b2c69 | 2418 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2419 | return 0; |
6f0b2c69 | 2420 | } |
398715ab | 2421 | |
f11d08c3 AL |
2422 | /* sanity check */ |
2423 | if (!rdev->desc->ops->list_voltage) | |
2424 | return -EINVAL; | |
398715ab | 2425 | |
f11d08c3 AL |
2426 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2427 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2428 | ||
2429 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2430 | } |
b19dbf71 | 2431 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2432 | |
606a2562 MB |
2433 | /** |
2434 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2435 | * @regulator: regulator source | |
2436 | * | |
2437 | * Re-apply the last configured voltage. This is intended to be used | |
2438 | * where some external control source the consumer is cooperating with | |
2439 | * has caused the configured voltage to change. | |
2440 | */ | |
2441 | int regulator_sync_voltage(struct regulator *regulator) | |
2442 | { | |
2443 | struct regulator_dev *rdev = regulator->rdev; | |
2444 | int ret, min_uV, max_uV; | |
2445 | ||
2446 | mutex_lock(&rdev->mutex); | |
2447 | ||
2448 | if (!rdev->desc->ops->set_voltage && | |
2449 | !rdev->desc->ops->set_voltage_sel) { | |
2450 | ret = -EINVAL; | |
2451 | goto out; | |
2452 | } | |
2453 | ||
2454 | /* This is only going to work if we've had a voltage configured. */ | |
2455 | if (!regulator->min_uV && !regulator->max_uV) { | |
2456 | ret = -EINVAL; | |
2457 | goto out; | |
2458 | } | |
2459 | ||
2460 | min_uV = regulator->min_uV; | |
2461 | max_uV = regulator->max_uV; | |
2462 | ||
2463 | /* This should be a paranoia check... */ | |
2464 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2465 | if (ret < 0) | |
2466 | goto out; | |
2467 | ||
2468 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2469 | if (ret < 0) | |
2470 | goto out; | |
2471 | ||
2472 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2473 | ||
2474 | out: | |
2475 | mutex_unlock(&rdev->mutex); | |
2476 | return ret; | |
2477 | } | |
2478 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2479 | ||
414c70cb LG |
2480 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2481 | { | |
bf5892a8 | 2482 | int sel, ret; |
476c2d83 MB |
2483 | |
2484 | if (rdev->desc->ops->get_voltage_sel) { | |
2485 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2486 | if (sel < 0) | |
2487 | return sel; | |
bf5892a8 | 2488 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2489 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2490 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2491 | } else if (rdev->desc->ops->list_voltage) { |
2492 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
cb220d16 | 2493 | } else { |
414c70cb | 2494 | return -EINVAL; |
cb220d16 | 2495 | } |
bf5892a8 | 2496 | |
cb220d16 AL |
2497 | if (ret < 0) |
2498 | return ret; | |
bf5892a8 | 2499 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2500 | } |
2501 | ||
2502 | /** | |
2503 | * regulator_get_voltage - get regulator output voltage | |
2504 | * @regulator: regulator source | |
2505 | * | |
2506 | * This returns the current regulator voltage in uV. | |
2507 | * | |
2508 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2509 | * function should not be used to determine regulator state. | |
2510 | */ | |
2511 | int regulator_get_voltage(struct regulator *regulator) | |
2512 | { | |
2513 | int ret; | |
2514 | ||
2515 | mutex_lock(®ulator->rdev->mutex); | |
2516 | ||
2517 | ret = _regulator_get_voltage(regulator->rdev); | |
2518 | ||
2519 | mutex_unlock(®ulator->rdev->mutex); | |
2520 | ||
2521 | return ret; | |
2522 | } | |
2523 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2524 | ||
2525 | /** | |
2526 | * regulator_set_current_limit - set regulator output current limit | |
2527 | * @regulator: regulator source | |
ce0d10f8 | 2528 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2529 | * @max_uA: Maximum supported current in uA |
2530 | * | |
2531 | * Sets current sink to the desired output current. This can be set during | |
2532 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2533 | * | |
2534 | * If the regulator is enabled then the current will change to the new value | |
2535 | * immediately otherwise if the regulator is disabled the regulator will | |
2536 | * output at the new current when enabled. | |
2537 | * | |
2538 | * NOTE: Regulator system constraints must be set for this regulator before | |
2539 | * calling this function otherwise this call will fail. | |
2540 | */ | |
2541 | int regulator_set_current_limit(struct regulator *regulator, | |
2542 | int min_uA, int max_uA) | |
2543 | { | |
2544 | struct regulator_dev *rdev = regulator->rdev; | |
2545 | int ret; | |
2546 | ||
2547 | mutex_lock(&rdev->mutex); | |
2548 | ||
2549 | /* sanity check */ | |
2550 | if (!rdev->desc->ops->set_current_limit) { | |
2551 | ret = -EINVAL; | |
2552 | goto out; | |
2553 | } | |
2554 | ||
2555 | /* constraints check */ | |
2556 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2557 | if (ret < 0) | |
2558 | goto out; | |
2559 | ||
2560 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2561 | out: | |
2562 | mutex_unlock(&rdev->mutex); | |
2563 | return ret; | |
2564 | } | |
2565 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2566 | ||
2567 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2568 | { | |
2569 | int ret; | |
2570 | ||
2571 | mutex_lock(&rdev->mutex); | |
2572 | ||
2573 | /* sanity check */ | |
2574 | if (!rdev->desc->ops->get_current_limit) { | |
2575 | ret = -EINVAL; | |
2576 | goto out; | |
2577 | } | |
2578 | ||
2579 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2580 | out: | |
2581 | mutex_unlock(&rdev->mutex); | |
2582 | return ret; | |
2583 | } | |
2584 | ||
2585 | /** | |
2586 | * regulator_get_current_limit - get regulator output current | |
2587 | * @regulator: regulator source | |
2588 | * | |
2589 | * This returns the current supplied by the specified current sink in uA. | |
2590 | * | |
2591 | * NOTE: If the regulator is disabled it will return the current value. This | |
2592 | * function should not be used to determine regulator state. | |
2593 | */ | |
2594 | int regulator_get_current_limit(struct regulator *regulator) | |
2595 | { | |
2596 | return _regulator_get_current_limit(regulator->rdev); | |
2597 | } | |
2598 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2599 | ||
2600 | /** | |
2601 | * regulator_set_mode - set regulator operating mode | |
2602 | * @regulator: regulator source | |
2603 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2604 | * | |
2605 | * Set regulator operating mode to increase regulator efficiency or improve | |
2606 | * regulation performance. | |
2607 | * | |
2608 | * NOTE: Regulator system constraints must be set for this regulator before | |
2609 | * calling this function otherwise this call will fail. | |
2610 | */ | |
2611 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2612 | { | |
2613 | struct regulator_dev *rdev = regulator->rdev; | |
2614 | int ret; | |
500b4ac9 | 2615 | int regulator_curr_mode; |
414c70cb LG |
2616 | |
2617 | mutex_lock(&rdev->mutex); | |
2618 | ||
2619 | /* sanity check */ | |
2620 | if (!rdev->desc->ops->set_mode) { | |
2621 | ret = -EINVAL; | |
2622 | goto out; | |
2623 | } | |
2624 | ||
500b4ac9 SI |
2625 | /* return if the same mode is requested */ |
2626 | if (rdev->desc->ops->get_mode) { | |
2627 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2628 | if (regulator_curr_mode == mode) { | |
2629 | ret = 0; | |
2630 | goto out; | |
2631 | } | |
2632 | } | |
2633 | ||
414c70cb | 2634 | /* constraints check */ |
22c51b47 | 2635 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2636 | if (ret < 0) |
2637 | goto out; | |
2638 | ||
2639 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2640 | out: | |
2641 | mutex_unlock(&rdev->mutex); | |
2642 | return ret; | |
2643 | } | |
2644 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2645 | ||
2646 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2647 | { | |
2648 | int ret; | |
2649 | ||
2650 | mutex_lock(&rdev->mutex); | |
2651 | ||
2652 | /* sanity check */ | |
2653 | if (!rdev->desc->ops->get_mode) { | |
2654 | ret = -EINVAL; | |
2655 | goto out; | |
2656 | } | |
2657 | ||
2658 | ret = rdev->desc->ops->get_mode(rdev); | |
2659 | out: | |
2660 | mutex_unlock(&rdev->mutex); | |
2661 | return ret; | |
2662 | } | |
2663 | ||
2664 | /** | |
2665 | * regulator_get_mode - get regulator operating mode | |
2666 | * @regulator: regulator source | |
2667 | * | |
2668 | * Get the current regulator operating mode. | |
2669 | */ | |
2670 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2671 | { | |
2672 | return _regulator_get_mode(regulator->rdev); | |
2673 | } | |
2674 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2675 | ||
2676 | /** | |
2677 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2678 | * @regulator: regulator source | |
2679 | * @uA_load: load current | |
2680 | * | |
2681 | * Notifies the regulator core of a new device load. This is then used by | |
2682 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2683 | * operating mode for the new regulator loading. | |
2684 | * | |
2685 | * Consumer devices notify their supply regulator of the maximum power | |
2686 | * they will require (can be taken from device datasheet in the power | |
2687 | * consumption tables) when they change operational status and hence power | |
2688 | * state. Examples of operational state changes that can affect power | |
2689 | * consumption are :- | |
2690 | * | |
2691 | * o Device is opened / closed. | |
2692 | * o Device I/O is about to begin or has just finished. | |
2693 | * o Device is idling in between work. | |
2694 | * | |
2695 | * This information is also exported via sysfs to userspace. | |
2696 | * | |
2697 | * DRMS will sum the total requested load on the regulator and change | |
2698 | * to the most efficient operating mode if platform constraints allow. | |
2699 | * | |
2700 | * Returns the new regulator mode or error. | |
2701 | */ | |
2702 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2703 | { | |
2704 | struct regulator_dev *rdev = regulator->rdev; | |
2705 | struct regulator *consumer; | |
d92d95b6 | 2706 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
414c70cb LG |
2707 | unsigned int mode; |
2708 | ||
d92d95b6 SB |
2709 | if (rdev->supply) |
2710 | input_uV = regulator_get_voltage(rdev->supply); | |
2711 | ||
414c70cb LG |
2712 | mutex_lock(&rdev->mutex); |
2713 | ||
a4b41483 MB |
2714 | /* |
2715 | * first check to see if we can set modes at all, otherwise just | |
2716 | * tell the consumer everything is OK. | |
2717 | */ | |
414c70cb LG |
2718 | regulator->uA_load = uA_load; |
2719 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2720 | if (ret < 0) { |
2721 | ret = 0; | |
414c70cb | 2722 | goto out; |
a4b41483 | 2723 | } |
414c70cb | 2724 | |
414c70cb LG |
2725 | if (!rdev->desc->ops->get_optimum_mode) |
2726 | goto out; | |
2727 | ||
a4b41483 MB |
2728 | /* |
2729 | * we can actually do this so any errors are indicators of | |
2730 | * potential real failure. | |
2731 | */ | |
2732 | ret = -EINVAL; | |
2733 | ||
854ccbae AL |
2734 | if (!rdev->desc->ops->set_mode) |
2735 | goto out; | |
2736 | ||
414c70cb | 2737 | /* get output voltage */ |
1bf5a1f8 | 2738 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2739 | if (output_uV <= 0) { |
5da84fd9 | 2740 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2741 | goto out; |
2742 | } | |
2743 | ||
d92d95b6 | 2744 | /* No supply? Use constraint voltage */ |
1bf5a1f8 | 2745 | if (input_uV <= 0) |
414c70cb LG |
2746 | input_uV = rdev->constraints->input_uV; |
2747 | if (input_uV <= 0) { | |
5da84fd9 | 2748 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2749 | goto out; |
2750 | } | |
2751 | ||
2752 | /* calc total requested load for this regulator */ | |
2753 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2754 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2755 | |
2756 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2757 | input_uV, output_uV, | |
2758 | total_uA_load); | |
2c608234 | 2759 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2760 | if (ret < 0) { |
5da84fd9 JP |
2761 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2762 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2763 | goto out; |
2764 | } | |
2765 | ||
2766 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2767 | if (ret < 0) { |
5da84fd9 | 2768 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2769 | goto out; |
2770 | } | |
2771 | ret = mode; | |
2772 | out: | |
2773 | mutex_unlock(&rdev->mutex); | |
2774 | return ret; | |
2775 | } | |
2776 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2777 | ||
f59c8f9f MB |
2778 | /** |
2779 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
2780 | * | |
2781 | * @regulator: Regulator to configure | |
9345dfb8 | 2782 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
2783 | * |
2784 | * Allow the regulator to go into bypass mode if all other consumers | |
2785 | * for the regulator also enable bypass mode and the machine | |
2786 | * constraints allow this. Bypass mode means that the regulator is | |
2787 | * simply passing the input directly to the output with no regulation. | |
2788 | */ | |
2789 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
2790 | { | |
2791 | struct regulator_dev *rdev = regulator->rdev; | |
2792 | int ret = 0; | |
2793 | ||
2794 | if (!rdev->desc->ops->set_bypass) | |
2795 | return 0; | |
2796 | ||
2797 | if (rdev->constraints && | |
2798 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
2799 | return 0; | |
2800 | ||
2801 | mutex_lock(&rdev->mutex); | |
2802 | ||
2803 | if (enable && !regulator->bypass) { | |
2804 | rdev->bypass_count++; | |
2805 | ||
2806 | if (rdev->bypass_count == rdev->open_count) { | |
2807 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2808 | if (ret != 0) | |
2809 | rdev->bypass_count--; | |
2810 | } | |
2811 | ||
2812 | } else if (!enable && regulator->bypass) { | |
2813 | rdev->bypass_count--; | |
2814 | ||
2815 | if (rdev->bypass_count != rdev->open_count) { | |
2816 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2817 | if (ret != 0) | |
2818 | rdev->bypass_count++; | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | if (ret == 0) | |
2823 | regulator->bypass = enable; | |
2824 | ||
2825 | mutex_unlock(&rdev->mutex); | |
2826 | ||
2827 | return ret; | |
2828 | } | |
2829 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
2830 | ||
414c70cb LG |
2831 | /** |
2832 | * regulator_register_notifier - register regulator event notifier | |
2833 | * @regulator: regulator source | |
69279fb9 | 2834 | * @nb: notifier block |
414c70cb LG |
2835 | * |
2836 | * Register notifier block to receive regulator events. | |
2837 | */ | |
2838 | int regulator_register_notifier(struct regulator *regulator, | |
2839 | struct notifier_block *nb) | |
2840 | { | |
2841 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2842 | nb); | |
2843 | } | |
2844 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2845 | ||
2846 | /** | |
2847 | * regulator_unregister_notifier - unregister regulator event notifier | |
2848 | * @regulator: regulator source | |
69279fb9 | 2849 | * @nb: notifier block |
414c70cb LG |
2850 | * |
2851 | * Unregister regulator event notifier block. | |
2852 | */ | |
2853 | int regulator_unregister_notifier(struct regulator *regulator, | |
2854 | struct notifier_block *nb) | |
2855 | { | |
2856 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2857 | nb); | |
2858 | } | |
2859 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2860 | ||
b136fb44 JC |
2861 | /* notify regulator consumers and downstream regulator consumers. |
2862 | * Note mutex must be held by caller. | |
2863 | */ | |
414c70cb LG |
2864 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2865 | unsigned long event, void *data) | |
2866 | { | |
414c70cb | 2867 | /* call rdev chain first */ |
d8493d21 | 2868 | blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
2869 | } |
2870 | ||
2871 | /** | |
2872 | * regulator_bulk_get - get multiple regulator consumers | |
2873 | * | |
2874 | * @dev: Device to supply | |
2875 | * @num_consumers: Number of consumers to register | |
2876 | * @consumers: Configuration of consumers; clients are stored here. | |
2877 | * | |
2878 | * @return 0 on success, an errno on failure. | |
2879 | * | |
2880 | * This helper function allows drivers to get several regulator | |
2881 | * consumers in one operation. If any of the regulators cannot be | |
2882 | * acquired then any regulators that were allocated will be freed | |
2883 | * before returning to the caller. | |
2884 | */ | |
2885 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2886 | struct regulator_bulk_data *consumers) | |
2887 | { | |
2888 | int i; | |
2889 | int ret; | |
2890 | ||
2891 | for (i = 0; i < num_consumers; i++) | |
2892 | consumers[i].consumer = NULL; | |
2893 | ||
2894 | for (i = 0; i < num_consumers; i++) { | |
2895 | consumers[i].consumer = regulator_get(dev, | |
2896 | consumers[i].supply); | |
2897 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2898 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2899 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2900 | consumers[i].supply, ret); | |
414c70cb LG |
2901 | consumers[i].consumer = NULL; |
2902 | goto err; | |
2903 | } | |
2904 | } | |
2905 | ||
2906 | return 0; | |
2907 | ||
2908 | err: | |
b29c7690 | 2909 | while (--i >= 0) |
414c70cb LG |
2910 | regulator_put(consumers[i].consumer); |
2911 | ||
2912 | return ret; | |
2913 | } | |
2914 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2915 | ||
e6e74030 MB |
2916 | /** |
2917 | * devm_regulator_bulk_get - managed get multiple regulator consumers | |
2918 | * | |
2919 | * @dev: Device to supply | |
2920 | * @num_consumers: Number of consumers to register | |
2921 | * @consumers: Configuration of consumers; clients are stored here. | |
2922 | * | |
2923 | * @return 0 on success, an errno on failure. | |
2924 | * | |
2925 | * This helper function allows drivers to get several regulator | |
2926 | * consumers in one operation with management, the regulators will | |
2927 | * automatically be freed when the device is unbound. If any of the | |
2928 | * regulators cannot be acquired then any regulators that were | |
2929 | * allocated will be freed before returning to the caller. | |
2930 | */ | |
2931 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, | |
2932 | struct regulator_bulk_data *consumers) | |
2933 | { | |
2934 | int i; | |
2935 | int ret; | |
2936 | ||
2937 | for (i = 0; i < num_consumers; i++) | |
2938 | consumers[i].consumer = NULL; | |
2939 | ||
2940 | for (i = 0; i < num_consumers; i++) { | |
2941 | consumers[i].consumer = devm_regulator_get(dev, | |
2942 | consumers[i].supply); | |
2943 | if (IS_ERR(consumers[i].consumer)) { | |
2944 | ret = PTR_ERR(consumers[i].consumer); | |
2945 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
2946 | consumers[i].supply, ret); | |
2947 | consumers[i].consumer = NULL; | |
2948 | goto err; | |
2949 | } | |
2950 | } | |
2951 | ||
2952 | return 0; | |
2953 | ||
2954 | err: | |
2955 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2956 | devm_regulator_put(consumers[i].consumer); | |
2957 | ||
2958 | return ret; | |
2959 | } | |
2960 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); | |
2961 | ||
f21e0e81 MB |
2962 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2963 | { | |
2964 | struct regulator_bulk_data *bulk = data; | |
2965 | ||
2966 | bulk->ret = regulator_enable(bulk->consumer); | |
2967 | } | |
2968 | ||
414c70cb LG |
2969 | /** |
2970 | * regulator_bulk_enable - enable multiple regulator consumers | |
2971 | * | |
2972 | * @num_consumers: Number of consumers | |
2973 | * @consumers: Consumer data; clients are stored here. | |
2974 | * @return 0 on success, an errno on failure | |
2975 | * | |
2976 | * This convenience API allows consumers to enable multiple regulator | |
2977 | * clients in a single API call. If any consumers cannot be enabled | |
2978 | * then any others that were enabled will be disabled again prior to | |
2979 | * return. | |
2980 | */ | |
2981 | int regulator_bulk_enable(int num_consumers, | |
2982 | struct regulator_bulk_data *consumers) | |
2983 | { | |
2955b47d | 2984 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 2985 | int i; |
f21e0e81 | 2986 | int ret = 0; |
414c70cb | 2987 | |
6492bc1b MB |
2988 | for (i = 0; i < num_consumers; i++) { |
2989 | if (consumers[i].consumer->always_on) | |
2990 | consumers[i].ret = 0; | |
2991 | else | |
2992 | async_schedule_domain(regulator_bulk_enable_async, | |
2993 | &consumers[i], &async_domain); | |
2994 | } | |
f21e0e81 MB |
2995 | |
2996 | async_synchronize_full_domain(&async_domain); | |
2997 | ||
2998 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2999 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3000 | if (consumers[i].ret != 0) { |
3001 | ret = consumers[i].ret; | |
414c70cb | 3002 | goto err; |
f21e0e81 | 3003 | } |
414c70cb LG |
3004 | } |
3005 | ||
3006 | return 0; | |
3007 | ||
3008 | err: | |
fbe31057 AH |
3009 | for (i = 0; i < num_consumers; i++) { |
3010 | if (consumers[i].ret < 0) | |
3011 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3012 | consumers[i].ret); | |
3013 | else | |
3014 | regulator_disable(consumers[i].consumer); | |
3015 | } | |
414c70cb LG |
3016 | |
3017 | return ret; | |
3018 | } | |
3019 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3020 | ||
3021 | /** | |
3022 | * regulator_bulk_disable - disable multiple regulator consumers | |
3023 | * | |
3024 | * @num_consumers: Number of consumers | |
3025 | * @consumers: Consumer data; clients are stored here. | |
3026 | * @return 0 on success, an errno on failure | |
3027 | * | |
3028 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3029 | * clients in a single API call. If any consumers cannot be disabled |
3030 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3031 | * return. |
3032 | */ | |
3033 | int regulator_bulk_disable(int num_consumers, | |
3034 | struct regulator_bulk_data *consumers) | |
3035 | { | |
3036 | int i; | |
01e86f49 | 3037 | int ret, r; |
414c70cb | 3038 | |
49e22632 | 3039 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3040 | ret = regulator_disable(consumers[i].consumer); |
3041 | if (ret != 0) | |
3042 | goto err; | |
3043 | } | |
3044 | ||
3045 | return 0; | |
3046 | ||
3047 | err: | |
5da84fd9 | 3048 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3049 | for (++i; i < num_consumers; ++i) { |
3050 | r = regulator_enable(consumers[i].consumer); | |
3051 | if (r != 0) | |
3052 | pr_err("Failed to reename %s: %d\n", | |
3053 | consumers[i].supply, r); | |
3054 | } | |
414c70cb LG |
3055 | |
3056 | return ret; | |
3057 | } | |
3058 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3059 | ||
e1de2f42 DK |
3060 | /** |
3061 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3062 | * | |
3063 | * @num_consumers: Number of consumers | |
3064 | * @consumers: Consumer data; clients are stored here. | |
3065 | * @return 0 on success, an errno on failure | |
3066 | * | |
3067 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3068 | * clients in a single API call. | |
3069 | * NOTE: This should be used for situations when device damage will | |
3070 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3071 | * Although regulator_force_disable function call for some consumers can | |
3072 | * return error numbers, the function is called for all consumers. | |
3073 | */ | |
3074 | int regulator_bulk_force_disable(int num_consumers, | |
3075 | struct regulator_bulk_data *consumers) | |
3076 | { | |
3077 | int i; | |
3078 | int ret; | |
3079 | ||
3080 | for (i = 0; i < num_consumers; i++) | |
3081 | consumers[i].ret = | |
3082 | regulator_force_disable(consumers[i].consumer); | |
3083 | ||
3084 | for (i = 0; i < num_consumers; i++) { | |
3085 | if (consumers[i].ret != 0) { | |
3086 | ret = consumers[i].ret; | |
3087 | goto out; | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | return 0; | |
3092 | out: | |
3093 | return ret; | |
3094 | } | |
3095 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3096 | ||
414c70cb LG |
3097 | /** |
3098 | * regulator_bulk_free - free multiple regulator consumers | |
3099 | * | |
3100 | * @num_consumers: Number of consumers | |
3101 | * @consumers: Consumer data; clients are stored here. | |
3102 | * | |
3103 | * This convenience API allows consumers to free multiple regulator | |
3104 | * clients in a single API call. | |
3105 | */ | |
3106 | void regulator_bulk_free(int num_consumers, | |
3107 | struct regulator_bulk_data *consumers) | |
3108 | { | |
3109 | int i; | |
3110 | ||
3111 | for (i = 0; i < num_consumers; i++) { | |
3112 | regulator_put(consumers[i].consumer); | |
3113 | consumers[i].consumer = NULL; | |
3114 | } | |
3115 | } | |
3116 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3117 | ||
3118 | /** | |
3119 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3120 | * @rdev: regulator source |
414c70cb | 3121 | * @event: notifier block |
69279fb9 | 3122 | * @data: callback-specific data. |
414c70cb LG |
3123 | * |
3124 | * Called by regulator drivers to notify clients a regulator event has | |
3125 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3126 | * Note lock must be held by caller. |
414c70cb LG |
3127 | */ |
3128 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3129 | unsigned long event, void *data) | |
3130 | { | |
3131 | _notifier_call_chain(rdev, event, data); | |
3132 | return NOTIFY_DONE; | |
3133 | ||
3134 | } | |
3135 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3136 | ||
be721979 MB |
3137 | /** |
3138 | * regulator_mode_to_status - convert a regulator mode into a status | |
3139 | * | |
3140 | * @mode: Mode to convert | |
3141 | * | |
3142 | * Convert a regulator mode into a status. | |
3143 | */ | |
3144 | int regulator_mode_to_status(unsigned int mode) | |
3145 | { | |
3146 | switch (mode) { | |
3147 | case REGULATOR_MODE_FAST: | |
3148 | return REGULATOR_STATUS_FAST; | |
3149 | case REGULATOR_MODE_NORMAL: | |
3150 | return REGULATOR_STATUS_NORMAL; | |
3151 | case REGULATOR_MODE_IDLE: | |
3152 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3153 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3154 | return REGULATOR_STATUS_STANDBY; |
3155 | default: | |
1beaf762 | 3156 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3157 | } |
3158 | } | |
3159 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3160 | ||
7ad68e2f DB |
3161 | /* |
3162 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3163 | * create attributes that can be meaningfully displayed. | |
3164 | */ | |
3165 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3166 | { | |
3167 | struct device *dev = &rdev->dev; | |
3168 | struct regulator_ops *ops = rdev->desc->ops; | |
3169 | int status = 0; | |
3170 | ||
3171 | /* some attributes need specific methods to be displayed */ | |
4c78899b | 3172 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
f2889e65 MB |
3173 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
3174 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { | |
7ad68e2f DB |
3175 | status = device_create_file(dev, &dev_attr_microvolts); |
3176 | if (status < 0) | |
3177 | return status; | |
3178 | } | |
3179 | if (ops->get_current_limit) { | |
3180 | status = device_create_file(dev, &dev_attr_microamps); | |
3181 | if (status < 0) | |
3182 | return status; | |
3183 | } | |
3184 | if (ops->get_mode) { | |
3185 | status = device_create_file(dev, &dev_attr_opmode); | |
3186 | if (status < 0) | |
3187 | return status; | |
3188 | } | |
7b74d149 | 3189 | if (rdev->ena_pin || ops->is_enabled) { |
7ad68e2f DB |
3190 | status = device_create_file(dev, &dev_attr_state); |
3191 | if (status < 0) | |
3192 | return status; | |
3193 | } | |
853116a1 DB |
3194 | if (ops->get_status) { |
3195 | status = device_create_file(dev, &dev_attr_status); | |
3196 | if (status < 0) | |
3197 | return status; | |
3198 | } | |
f59c8f9f MB |
3199 | if (ops->get_bypass) { |
3200 | status = device_create_file(dev, &dev_attr_bypass); | |
3201 | if (status < 0) | |
3202 | return status; | |
3203 | } | |
7ad68e2f DB |
3204 | |
3205 | /* some attributes are type-specific */ | |
3206 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3207 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3208 | if (status < 0) | |
3209 | return status; | |
3210 | } | |
3211 | ||
3212 | /* all the other attributes exist to support constraints; | |
3213 | * don't show them if there are no constraints, or if the | |
3214 | * relevant supporting methods are missing. | |
3215 | */ | |
3216 | if (!rdev->constraints) | |
3217 | return status; | |
3218 | ||
3219 | /* constraints need specific supporting methods */ | |
e8eef82b | 3220 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3221 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3222 | if (status < 0) | |
3223 | return status; | |
3224 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3225 | if (status < 0) | |
3226 | return status; | |
3227 | } | |
3228 | if (ops->set_current_limit) { | |
3229 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3230 | if (status < 0) | |
3231 | return status; | |
3232 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3233 | if (status < 0) | |
3234 | return status; | |
3235 | } | |
3236 | ||
7ad68e2f DB |
3237 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3238 | if (status < 0) | |
3239 | return status; | |
3240 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3241 | if (status < 0) | |
3242 | return status; | |
3243 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3244 | if (status < 0) | |
3245 | return status; | |
3246 | ||
3247 | if (ops->set_suspend_voltage) { | |
3248 | status = device_create_file(dev, | |
3249 | &dev_attr_suspend_standby_microvolts); | |
3250 | if (status < 0) | |
3251 | return status; | |
3252 | status = device_create_file(dev, | |
3253 | &dev_attr_suspend_mem_microvolts); | |
3254 | if (status < 0) | |
3255 | return status; | |
3256 | status = device_create_file(dev, | |
3257 | &dev_attr_suspend_disk_microvolts); | |
3258 | if (status < 0) | |
3259 | return status; | |
3260 | } | |
3261 | ||
3262 | if (ops->set_suspend_mode) { | |
3263 | status = device_create_file(dev, | |
3264 | &dev_attr_suspend_standby_mode); | |
3265 | if (status < 0) | |
3266 | return status; | |
3267 | status = device_create_file(dev, | |
3268 | &dev_attr_suspend_mem_mode); | |
3269 | if (status < 0) | |
3270 | return status; | |
3271 | status = device_create_file(dev, | |
3272 | &dev_attr_suspend_disk_mode); | |
3273 | if (status < 0) | |
3274 | return status; | |
3275 | } | |
3276 | ||
3277 | return status; | |
3278 | } | |
3279 | ||
1130e5b3 MB |
3280 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3281 | { | |
1130e5b3 | 3282 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3283 | if (!rdev->debugfs) { |
1130e5b3 | 3284 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3285 | return; |
3286 | } | |
3287 | ||
3288 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3289 | &rdev->use_count); | |
3290 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3291 | &rdev->open_count); | |
f59c8f9f MB |
3292 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3293 | &rdev->bypass_count); | |
1130e5b3 MB |
3294 | } |
3295 | ||
414c70cb LG |
3296 | /** |
3297 | * regulator_register - register regulator | |
69279fb9 | 3298 | * @regulator_desc: regulator to register |
c172708d | 3299 | * @config: runtime configuration for regulator |
414c70cb LG |
3300 | * |
3301 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3302 | * Returns a valid pointer to struct regulator_dev on success |
3303 | * or an ERR_PTR() on error. | |
414c70cb | 3304 | */ |
65f26846 MB |
3305 | struct regulator_dev * |
3306 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3307 | const struct regulator_config *config) |
414c70cb | 3308 | { |
9a8f5e07 | 3309 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3310 | const struct regulator_init_data *init_data; |
414c70cb LG |
3311 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3312 | struct regulator_dev *rdev; | |
32c8fad4 | 3313 | struct device *dev; |
a5766f11 | 3314 | int ret, i; |
69511a45 | 3315 | const char *supply = NULL; |
414c70cb | 3316 | |
c172708d | 3317 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3318 | return ERR_PTR(-EINVAL); |
3319 | ||
32c8fad4 | 3320 | dev = config->dev; |
dcf70112 | 3321 | WARN_ON(!dev); |
32c8fad4 | 3322 | |
414c70cb LG |
3323 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3324 | return ERR_PTR(-EINVAL); | |
3325 | ||
cd78dfc6 DL |
3326 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3327 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3328 | return ERR_PTR(-EINVAL); |
3329 | ||
476c2d83 MB |
3330 | /* Only one of each should be implemented */ |
3331 | WARN_ON(regulator_desc->ops->get_voltage && | |
3332 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3333 | WARN_ON(regulator_desc->ops->set_voltage && |
3334 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3335 | |
3336 | /* If we're using selectors we must implement list_voltage. */ | |
3337 | if (regulator_desc->ops->get_voltage_sel && | |
3338 | !regulator_desc->ops->list_voltage) { | |
3339 | return ERR_PTR(-EINVAL); | |
3340 | } | |
e8eef82b MB |
3341 | if (regulator_desc->ops->set_voltage_sel && |
3342 | !regulator_desc->ops->list_voltage) { | |
3343 | return ERR_PTR(-EINVAL); | |
3344 | } | |
476c2d83 | 3345 | |
c172708d MB |
3346 | init_data = config->init_data; |
3347 | ||
414c70cb LG |
3348 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3349 | if (rdev == NULL) | |
3350 | return ERR_PTR(-ENOMEM); | |
3351 | ||
3352 | mutex_lock(®ulator_list_mutex); | |
3353 | ||
3354 | mutex_init(&rdev->mutex); | |
c172708d | 3355 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3356 | rdev->owner = regulator_desc->owner; |
3357 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3358 | if (config->regmap) |
3359 | rdev->regmap = config->regmap; | |
52b84dac | 3360 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3361 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3362 | else if (dev->parent) |
3363 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3364 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3365 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3366 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3367 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3368 | |
a5766f11 | 3369 | /* preform any regulator specific init */ |
9a8f5e07 | 3370 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3371 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3372 | if (ret < 0) |
3373 | goto clean; | |
a5766f11 LG |
3374 | } |
3375 | ||
a5766f11 | 3376 | /* register with sysfs */ |
414c70cb | 3377 | rdev->dev.class = ®ulator_class; |
c172708d | 3378 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3379 | rdev->dev.parent = dev; |
812460a9 KS |
3380 | dev_set_name(&rdev->dev, "regulator.%d", |
3381 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3382 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3383 | if (ret != 0) { |
3384 | put_device(&rdev->dev); | |
4fca9545 | 3385 | goto clean; |
ad7725cb | 3386 | } |
a5766f11 LG |
3387 | |
3388 | dev_set_drvdata(&rdev->dev, rdev); | |
3389 | ||
b2a1ef47 | 3390 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
f19b00da | 3391 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3392 | if (ret != 0) { |
3393 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3394 | config->ena_gpio, ret); | |
b2da55d9 | 3395 | goto wash; |
65f73508 MB |
3396 | } |
3397 | ||
65f73508 MB |
3398 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) |
3399 | rdev->ena_gpio_state = 1; | |
3400 | ||
7b74d149 | 3401 | if (config->ena_gpio_invert) |
65f73508 MB |
3402 | rdev->ena_gpio_state = !rdev->ena_gpio_state; |
3403 | } | |
3404 | ||
74f544c1 | 3405 | /* set regulator constraints */ |
9a8f5e07 MB |
3406 | if (init_data) |
3407 | constraints = &init_data->constraints; | |
3408 | ||
3409 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3410 | if (ret < 0) |
3411 | goto scrub; | |
3412 | ||
7ad68e2f DB |
3413 | /* add attributes supported by this regulator */ |
3414 | ret = add_regulator_attributes(rdev); | |
3415 | if (ret < 0) | |
3416 | goto scrub; | |
3417 | ||
9a8f5e07 | 3418 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3419 | supply = init_data->supply_regulator; |
3420 | else if (regulator_desc->supply_name) | |
3421 | supply = regulator_desc->supply_name; | |
3422 | ||
3423 | if (supply) { | |
0178f3e2 | 3424 | struct regulator_dev *r; |
0178f3e2 | 3425 | |
6d191a5f | 3426 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3427 | |
0f7b87f0 AB |
3428 | if (ret == -ENODEV) { |
3429 | /* | |
3430 | * No supply was specified for this regulator and | |
3431 | * there will never be one. | |
3432 | */ | |
3433 | ret = 0; | |
3434 | goto add_dev; | |
3435 | } else if (!r) { | |
69511a45 | 3436 | dev_err(dev, "Failed to find supply %s\n", supply); |
04bf3011 | 3437 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3438 | goto scrub; |
3439 | } | |
3440 | ||
3441 | ret = set_supply(rdev, r); | |
3442 | if (ret < 0) | |
3443 | goto scrub; | |
b2296bd4 LD |
3444 | |
3445 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3446 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3447 | ret = regulator_enable(rdev->supply); |
3448 | if (ret < 0) | |
3449 | goto scrub; | |
3450 | } | |
0178f3e2 MB |
3451 | } |
3452 | ||
0f7b87f0 | 3453 | add_dev: |
a5766f11 | 3454 | /* add consumers devices */ |
9a8f5e07 MB |
3455 | if (init_data) { |
3456 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3457 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3458 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3459 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3460 | if (ret < 0) { |
3461 | dev_err(dev, "Failed to set supply %s\n", | |
3462 | init_data->consumer_supplies[i].supply); | |
3463 | goto unset_supplies; | |
3464 | } | |
23c2f041 | 3465 | } |
414c70cb | 3466 | } |
a5766f11 LG |
3467 | |
3468 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3469 | |
3470 | rdev_init_debugfs(rdev); | |
a5766f11 | 3471 | out: |
414c70cb LG |
3472 | mutex_unlock(®ulator_list_mutex); |
3473 | return rdev; | |
4fca9545 | 3474 | |
d4033b54 JN |
3475 | unset_supplies: |
3476 | unset_regulator_supplies(rdev); | |
3477 | ||
4fca9545 | 3478 | scrub: |
e81dba85 | 3479 | if (rdev->supply) |
23ff2f0f | 3480 | _regulator_put(rdev->supply); |
f19b00da | 3481 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3482 | kfree(rdev->constraints); |
b2da55d9 | 3483 | wash: |
4fca9545 | 3484 | device_unregister(&rdev->dev); |
53032daf PW |
3485 | /* device core frees rdev */ |
3486 | rdev = ERR_PTR(ret); | |
3487 | goto out; | |
3488 | ||
4fca9545 DB |
3489 | clean: |
3490 | kfree(rdev); | |
3491 | rdev = ERR_PTR(ret); | |
3492 | goto out; | |
414c70cb LG |
3493 | } |
3494 | EXPORT_SYMBOL_GPL(regulator_register); | |
3495 | ||
3496 | /** | |
3497 | * regulator_unregister - unregister regulator | |
69279fb9 | 3498 | * @rdev: regulator to unregister |
414c70cb LG |
3499 | * |
3500 | * Called by regulator drivers to unregister a regulator. | |
3501 | */ | |
3502 | void regulator_unregister(struct regulator_dev *rdev) | |
3503 | { | |
3504 | if (rdev == NULL) | |
3505 | return; | |
3506 | ||
891636ea MB |
3507 | if (rdev->supply) { |
3508 | while (rdev->use_count--) | |
3509 | regulator_disable(rdev->supply); | |
e032b376 | 3510 | regulator_put(rdev->supply); |
891636ea | 3511 | } |
414c70cb | 3512 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3513 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3514 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3515 | WARN_ON(rdev->open_count); |
0f1d747b | 3516 | unset_regulator_supplies(rdev); |
414c70cb | 3517 | list_del(&rdev->list); |
f8c12fe3 | 3518 | kfree(rdev->constraints); |
f19b00da | 3519 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 3520 | device_unregister(&rdev->dev); |
414c70cb LG |
3521 | mutex_unlock(®ulator_list_mutex); |
3522 | } | |
3523 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3524 | ||
414c70cb | 3525 | /** |
cf7bbcdf | 3526 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3527 | * @state: system suspend state |
3528 | * | |
3529 | * Configure each regulator with it's suspend operating parameters for state. | |
3530 | * This will usually be called by machine suspend code prior to supending. | |
3531 | */ | |
3532 | int regulator_suspend_prepare(suspend_state_t state) | |
3533 | { | |
3534 | struct regulator_dev *rdev; | |
3535 | int ret = 0; | |
3536 | ||
3537 | /* ON is handled by regulator active state */ | |
3538 | if (state == PM_SUSPEND_ON) | |
3539 | return -EINVAL; | |
3540 | ||
3541 | mutex_lock(®ulator_list_mutex); | |
3542 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3543 | ||
3544 | mutex_lock(&rdev->mutex); | |
3545 | ret = suspend_prepare(rdev, state); | |
3546 | mutex_unlock(&rdev->mutex); | |
3547 | ||
3548 | if (ret < 0) { | |
5da84fd9 | 3549 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3550 | goto out; |
3551 | } | |
3552 | } | |
3553 | out: | |
3554 | mutex_unlock(®ulator_list_mutex); | |
3555 | return ret; | |
3556 | } | |
3557 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3558 | ||
7a32b589 MH |
3559 | /** |
3560 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3561 | * | |
3562 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3563 | * and that should be turned on according to the regulators properties. | |
3564 | */ | |
3565 | int regulator_suspend_finish(void) | |
3566 | { | |
3567 | struct regulator_dev *rdev; | |
3568 | int ret = 0, error; | |
3569 | ||
3570 | mutex_lock(®ulator_list_mutex); | |
3571 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3572 | struct regulator_ops *ops = rdev->desc->ops; | |
3573 | ||
3574 | mutex_lock(&rdev->mutex); | |
3575 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3576 | ops->enable) { | |
3577 | error = ops->enable(rdev); | |
3578 | if (error) | |
3579 | ret = error; | |
3580 | } else { | |
3581 | if (!has_full_constraints) | |
3582 | goto unlock; | |
3583 | if (!ops->disable) | |
3584 | goto unlock; | |
b1a86831 | 3585 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3586 | goto unlock; |
3587 | ||
3588 | error = ops->disable(rdev); | |
3589 | if (error) | |
3590 | ret = error; | |
3591 | } | |
3592 | unlock: | |
3593 | mutex_unlock(&rdev->mutex); | |
3594 | } | |
3595 | mutex_unlock(®ulator_list_mutex); | |
3596 | return ret; | |
3597 | } | |
3598 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3599 | ||
ca725561 MB |
3600 | /** |
3601 | * regulator_has_full_constraints - the system has fully specified constraints | |
3602 | * | |
3603 | * Calling this function will cause the regulator API to disable all | |
3604 | * regulators which have a zero use count and don't have an always_on | |
3605 | * constraint in a late_initcall. | |
3606 | * | |
3607 | * The intention is that this will become the default behaviour in a | |
3608 | * future kernel release so users are encouraged to use this facility | |
3609 | * now. | |
3610 | */ | |
3611 | void regulator_has_full_constraints(void) | |
3612 | { | |
3613 | has_full_constraints = 1; | |
3614 | } | |
3615 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3616 | ||
414c70cb LG |
3617 | /** |
3618 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3619 | * @rdev: regulator |
414c70cb LG |
3620 | * |
3621 | * Get rdev regulator driver private data. This call can be used in the | |
3622 | * regulator driver context. | |
3623 | */ | |
3624 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3625 | { | |
3626 | return rdev->reg_data; | |
3627 | } | |
3628 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3629 | ||
3630 | /** | |
3631 | * regulator_get_drvdata - get regulator driver data | |
3632 | * @regulator: regulator | |
3633 | * | |
3634 | * Get regulator driver private data. This call can be used in the consumer | |
3635 | * driver context when non API regulator specific functions need to be called. | |
3636 | */ | |
3637 | void *regulator_get_drvdata(struct regulator *regulator) | |
3638 | { | |
3639 | return regulator->rdev->reg_data; | |
3640 | } | |
3641 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3642 | ||
3643 | /** | |
3644 | * regulator_set_drvdata - set regulator driver data | |
3645 | * @regulator: regulator | |
3646 | * @data: data | |
3647 | */ | |
3648 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3649 | { | |
3650 | regulator->rdev->reg_data = data; | |
3651 | } | |
3652 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3653 | ||
3654 | /** | |
3655 | * regulator_get_id - get regulator ID | |
69279fb9 | 3656 | * @rdev: regulator |
414c70cb LG |
3657 | */ |
3658 | int rdev_get_id(struct regulator_dev *rdev) | |
3659 | { | |
3660 | return rdev->desc->id; | |
3661 | } | |
3662 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3663 | ||
a5766f11 LG |
3664 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3665 | { | |
3666 | return &rdev->dev; | |
3667 | } | |
3668 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3669 | ||
3670 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3671 | { | |
3672 | return reg_init_data->driver_data; | |
3673 | } | |
3674 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3675 | ||
ba55a974 MB |
3676 | #ifdef CONFIG_DEBUG_FS |
3677 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3678 | size_t count, loff_t *ppos) | |
3679 | { | |
3680 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3681 | ssize_t len, ret = 0; | |
3682 | struct regulator_map *map; | |
3683 | ||
3684 | if (!buf) | |
3685 | return -ENOMEM; | |
3686 | ||
3687 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3688 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3689 | "%s -> %s.%s\n", | |
3690 | rdev_get_name(map->regulator), map->dev_name, | |
3691 | map->supply); | |
3692 | if (len >= 0) | |
3693 | ret += len; | |
3694 | if (ret > PAGE_SIZE) { | |
3695 | ret = PAGE_SIZE; | |
3696 | break; | |
3697 | } | |
3698 | } | |
3699 | ||
3700 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3701 | ||
3702 | kfree(buf); | |
3703 | ||
3704 | return ret; | |
3705 | } | |
24751434 | 3706 | #endif |
ba55a974 MB |
3707 | |
3708 | static const struct file_operations supply_map_fops = { | |
24751434 | 3709 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3710 | .read = supply_map_read_file, |
3711 | .llseek = default_llseek, | |
ba55a974 | 3712 | #endif |
24751434 | 3713 | }; |
ba55a974 | 3714 | |
414c70cb LG |
3715 | static int __init regulator_init(void) |
3716 | { | |
34abbd68 MB |
3717 | int ret; |
3718 | ||
34abbd68 MB |
3719 | ret = class_register(®ulator_class); |
3720 | ||
1130e5b3 | 3721 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3722 | if (!debugfs_root) |
1130e5b3 | 3723 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3724 | |
f4d562c6 MB |
3725 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3726 | &supply_map_fops); | |
1130e5b3 | 3727 | |
34abbd68 MB |
3728 | regulator_dummy_init(); |
3729 | ||
3730 | return ret; | |
414c70cb LG |
3731 | } |
3732 | ||
3733 | /* init early to allow our consumers to complete system booting */ | |
3734 | core_initcall(regulator_init); | |
ca725561 MB |
3735 | |
3736 | static int __init regulator_init_complete(void) | |
3737 | { | |
3738 | struct regulator_dev *rdev; | |
3739 | struct regulator_ops *ops; | |
3740 | struct regulation_constraints *c; | |
3741 | int enabled, ret; | |
ca725561 | 3742 | |
86f5fcfc MB |
3743 | /* |
3744 | * Since DT doesn't provide an idiomatic mechanism for | |
3745 | * enabling full constraints and since it's much more natural | |
3746 | * with DT to provide them just assume that a DT enabled | |
3747 | * system has full constraints. | |
3748 | */ | |
3749 | if (of_have_populated_dt()) | |
3750 | has_full_constraints = true; | |
3751 | ||
ca725561 MB |
3752 | mutex_lock(®ulator_list_mutex); |
3753 | ||
3754 | /* If we have a full configuration then disable any regulators | |
3755 | * which are not in use or always_on. This will become the | |
3756 | * default behaviour in the future. | |
3757 | */ | |
3758 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3759 | ops = rdev->desc->ops; | |
3760 | c = rdev->constraints; | |
3761 | ||
f25e0b4f | 3762 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3763 | continue; |
3764 | ||
3765 | mutex_lock(&rdev->mutex); | |
3766 | ||
3767 | if (rdev->use_count) | |
3768 | goto unlock; | |
3769 | ||
3770 | /* If we can't read the status assume it's on. */ | |
3771 | if (ops->is_enabled) | |
3772 | enabled = ops->is_enabled(rdev); | |
3773 | else | |
3774 | enabled = 1; | |
3775 | ||
3776 | if (!enabled) | |
3777 | goto unlock; | |
3778 | ||
3779 | if (has_full_constraints) { | |
3780 | /* We log since this may kill the system if it | |
3781 | * goes wrong. */ | |
5da84fd9 | 3782 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3783 | ret = ops->disable(rdev); |
3784 | if (ret != 0) { | |
5da84fd9 | 3785 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3786 | } |
3787 | } else { | |
3788 | /* The intention is that in future we will | |
3789 | * assume that full constraints are provided | |
3790 | * so warn even if we aren't going to do | |
3791 | * anything here. | |
3792 | */ | |
5da84fd9 | 3793 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3794 | } |
3795 | ||
3796 | unlock: | |
3797 | mutex_unlock(&rdev->mutex); | |
3798 | } | |
3799 | ||
3800 | mutex_unlock(®ulator_list_mutex); | |
3801 | ||
3802 | return 0; | |
3803 | } | |
3804 | late_initcall(regulator_init_complete); |