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Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb LG |
53 | static DEFINE_MUTEX(regulator_list_mutex); |
54 | static LIST_HEAD(regulator_list); | |
55 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 56 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 57 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 58 | static bool has_full_constraints; |
414c70cb | 59 | |
1130e5b3 | 60 | static struct dentry *debugfs_root; |
1130e5b3 | 61 | |
8dc5390d | 62 | /* |
414c70cb LG |
63 | * struct regulator_map |
64 | * | |
65 | * Used to provide symbolic supply names to devices. | |
66 | */ | |
67 | struct regulator_map { | |
68 | struct list_head list; | |
40f9244f | 69 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 70 | const char *supply; |
a5766f11 | 71 | struct regulator_dev *regulator; |
414c70cb LG |
72 | }; |
73 | ||
f19b00da KM |
74 | /* |
75 | * struct regulator_enable_gpio | |
76 | * | |
77 | * Management for shared enable GPIO pin | |
78 | */ | |
79 | struct regulator_enable_gpio { | |
80 | struct list_head list; | |
778b28b4 | 81 | struct gpio_desc *gpiod; |
f19b00da KM |
82 | u32 enable_count; /* a number of enabled shared GPIO */ |
83 | u32 request_count; /* a number of requested shared GPIO */ | |
84 | unsigned int ena_gpio_invert:1; | |
85 | }; | |
86 | ||
a06ccd9c CK |
87 | /* |
88 | * struct regulator_supply_alias | |
89 | * | |
90 | * Used to map lookups for a supply onto an alternative device. | |
91 | */ | |
92 | struct regulator_supply_alias { | |
93 | struct list_head list; | |
94 | struct device *src_dev; | |
95 | const char *src_supply; | |
96 | struct device *alias_dev; | |
97 | const char *alias_supply; | |
98 | }; | |
99 | ||
414c70cb | 100 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 101 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
102 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
103 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
104 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 105 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 106 | unsigned long event, void *data); |
75790251 MB |
107 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
108 | int min_uV, int max_uV); | |
3801b86a MB |
109 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
110 | struct device *dev, | |
111 | const char *supply_name); | |
414c70cb | 112 | |
1083c393 MB |
113 | static const char *rdev_get_name(struct regulator_dev *rdev) |
114 | { | |
115 | if (rdev->constraints && rdev->constraints->name) | |
116 | return rdev->constraints->name; | |
117 | else if (rdev->desc->name) | |
118 | return rdev->desc->name; | |
119 | else | |
120 | return ""; | |
121 | } | |
122 | ||
87b28417 MB |
123 | static bool have_full_constraints(void) |
124 | { | |
75bc9641 | 125 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
126 | } |
127 | ||
69511a45 RN |
128 | /** |
129 | * of_get_regulator - get a regulator device node based on supply name | |
130 | * @dev: Device pointer for the consumer (of regulator) device | |
131 | * @supply: regulator supply name | |
132 | * | |
133 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 134 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
135 | * returns NULL. |
136 | */ | |
137 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
138 | { | |
139 | struct device_node *regnode = NULL; | |
140 | char prop_name[32]; /* 32 is max size of property name */ | |
141 | ||
142 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
143 | ||
144 | snprintf(prop_name, 32, "%s-supply", supply); | |
145 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
146 | ||
147 | if (!regnode) { | |
16fbcc3b | 148 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
149 | prop_name, dev->of_node->full_name); |
150 | return NULL; | |
151 | } | |
152 | return regnode; | |
153 | } | |
154 | ||
6492bc1b MB |
155 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
156 | { | |
157 | if (!rdev->constraints) | |
158 | return 0; | |
159 | ||
160 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
161 | return 1; | |
162 | else | |
163 | return 0; | |
164 | } | |
165 | ||
414c70cb LG |
166 | /* Platform voltage constraint check */ |
167 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
168 | int *min_uV, int *max_uV) | |
169 | { | |
170 | BUG_ON(*min_uV > *max_uV); | |
171 | ||
172 | if (!rdev->constraints) { | |
5da84fd9 | 173 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
174 | return -ENODEV; |
175 | } | |
176 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 177 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
178 | return -EPERM; |
179 | } | |
180 | ||
181 | if (*max_uV > rdev->constraints->max_uV) | |
182 | *max_uV = rdev->constraints->max_uV; | |
183 | if (*min_uV < rdev->constraints->min_uV) | |
184 | *min_uV = rdev->constraints->min_uV; | |
185 | ||
89f425ed MB |
186 | if (*min_uV > *max_uV) { |
187 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 188 | *min_uV, *max_uV); |
414c70cb | 189 | return -EINVAL; |
89f425ed | 190 | } |
414c70cb LG |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
05fda3b1 TP |
195 | /* Make sure we select a voltage that suits the needs of all |
196 | * regulator consumers | |
197 | */ | |
198 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
199 | int *min_uV, int *max_uV) | |
200 | { | |
201 | struct regulator *regulator; | |
202 | ||
203 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
204 | /* |
205 | * Assume consumers that didn't say anything are OK | |
206 | * with anything in the constraint range. | |
207 | */ | |
208 | if (!regulator->min_uV && !regulator->max_uV) | |
209 | continue; | |
210 | ||
05fda3b1 TP |
211 | if (*max_uV > regulator->max_uV) |
212 | *max_uV = regulator->max_uV; | |
213 | if (*min_uV < regulator->min_uV) | |
214 | *min_uV = regulator->min_uV; | |
215 | } | |
216 | ||
dd8004af | 217 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
218 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
219 | *min_uV, *max_uV); | |
05fda3b1 | 220 | return -EINVAL; |
dd8004af | 221 | } |
05fda3b1 TP |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
414c70cb LG |
226 | /* current constraint check */ |
227 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
228 | int *min_uA, int *max_uA) | |
229 | { | |
230 | BUG_ON(*min_uA > *max_uA); | |
231 | ||
232 | if (!rdev->constraints) { | |
5da84fd9 | 233 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
234 | return -ENODEV; |
235 | } | |
236 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 237 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
238 | return -EPERM; |
239 | } | |
240 | ||
241 | if (*max_uA > rdev->constraints->max_uA) | |
242 | *max_uA = rdev->constraints->max_uA; | |
243 | if (*min_uA < rdev->constraints->min_uA) | |
244 | *min_uA = rdev->constraints->min_uA; | |
245 | ||
89f425ed MB |
246 | if (*min_uA > *max_uA) { |
247 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 248 | *min_uA, *max_uA); |
414c70cb | 249 | return -EINVAL; |
89f425ed | 250 | } |
414c70cb LG |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* operating mode constraint check */ | |
2c608234 | 256 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 257 | { |
2c608234 | 258 | switch (*mode) { |
e573520b DB |
259 | case REGULATOR_MODE_FAST: |
260 | case REGULATOR_MODE_NORMAL: | |
261 | case REGULATOR_MODE_IDLE: | |
262 | case REGULATOR_MODE_STANDBY: | |
263 | break; | |
264 | default: | |
89f425ed | 265 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
266 | return -EINVAL; |
267 | } | |
268 | ||
414c70cb | 269 | if (!rdev->constraints) { |
5da84fd9 | 270 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
271 | return -ENODEV; |
272 | } | |
273 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 274 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
275 | return -EPERM; |
276 | } | |
2c608234 MB |
277 | |
278 | /* The modes are bitmasks, the most power hungry modes having | |
279 | * the lowest values. If the requested mode isn't supported | |
280 | * try higher modes. */ | |
281 | while (*mode) { | |
282 | if (rdev->constraints->valid_modes_mask & *mode) | |
283 | return 0; | |
284 | *mode /= 2; | |
414c70cb | 285 | } |
2c608234 MB |
286 | |
287 | return -EINVAL; | |
414c70cb LG |
288 | } |
289 | ||
290 | /* dynamic regulator mode switching constraint check */ | |
291 | static int regulator_check_drms(struct regulator_dev *rdev) | |
292 | { | |
293 | if (!rdev->constraints) { | |
5da84fd9 | 294 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
295 | return -ENODEV; |
296 | } | |
297 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 298 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
299 | return -EPERM; |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
414c70cb LG |
304 | static ssize_t regulator_uV_show(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
a5766f11 | 307 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
308 | ssize_t ret; |
309 | ||
310 | mutex_lock(&rdev->mutex); | |
311 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
312 | mutex_unlock(&rdev->mutex); | |
313 | ||
314 | return ret; | |
315 | } | |
7ad68e2f | 316 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
317 | |
318 | static ssize_t regulator_uA_show(struct device *dev, | |
319 | struct device_attribute *attr, char *buf) | |
320 | { | |
a5766f11 | 321 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
322 | |
323 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
324 | } | |
7ad68e2f | 325 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 326 | |
587cea27 GKH |
327 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
328 | char *buf) | |
bc558a60 MB |
329 | { |
330 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 331 | |
1083c393 | 332 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 333 | } |
587cea27 | 334 | static DEVICE_ATTR_RO(name); |
bc558a60 | 335 | |
4fca9545 | 336 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 337 | { |
414c70cb LG |
338 | switch (mode) { |
339 | case REGULATOR_MODE_FAST: | |
340 | return sprintf(buf, "fast\n"); | |
341 | case REGULATOR_MODE_NORMAL: | |
342 | return sprintf(buf, "normal\n"); | |
343 | case REGULATOR_MODE_IDLE: | |
344 | return sprintf(buf, "idle\n"); | |
345 | case REGULATOR_MODE_STANDBY: | |
346 | return sprintf(buf, "standby\n"); | |
347 | } | |
348 | return sprintf(buf, "unknown\n"); | |
349 | } | |
350 | ||
4fca9545 DB |
351 | static ssize_t regulator_opmode_show(struct device *dev, |
352 | struct device_attribute *attr, char *buf) | |
414c70cb | 353 | { |
a5766f11 | 354 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 355 | |
4fca9545 DB |
356 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
357 | } | |
7ad68e2f | 358 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
359 | |
360 | static ssize_t regulator_print_state(char *buf, int state) | |
361 | { | |
414c70cb LG |
362 | if (state > 0) |
363 | return sprintf(buf, "enabled\n"); | |
364 | else if (state == 0) | |
365 | return sprintf(buf, "disabled\n"); | |
366 | else | |
367 | return sprintf(buf, "unknown\n"); | |
368 | } | |
369 | ||
4fca9545 DB |
370 | static ssize_t regulator_state_show(struct device *dev, |
371 | struct device_attribute *attr, char *buf) | |
372 | { | |
373 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
374 | ssize_t ret; |
375 | ||
376 | mutex_lock(&rdev->mutex); | |
377 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
378 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 379 | |
9332546f | 380 | return ret; |
4fca9545 | 381 | } |
7ad68e2f | 382 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 383 | |
853116a1 DB |
384 | static ssize_t regulator_status_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
388 | int status; | |
389 | char *label; | |
390 | ||
391 | status = rdev->desc->ops->get_status(rdev); | |
392 | if (status < 0) | |
393 | return status; | |
394 | ||
395 | switch (status) { | |
396 | case REGULATOR_STATUS_OFF: | |
397 | label = "off"; | |
398 | break; | |
399 | case REGULATOR_STATUS_ON: | |
400 | label = "on"; | |
401 | break; | |
402 | case REGULATOR_STATUS_ERROR: | |
403 | label = "error"; | |
404 | break; | |
405 | case REGULATOR_STATUS_FAST: | |
406 | label = "fast"; | |
407 | break; | |
408 | case REGULATOR_STATUS_NORMAL: | |
409 | label = "normal"; | |
410 | break; | |
411 | case REGULATOR_STATUS_IDLE: | |
412 | label = "idle"; | |
413 | break; | |
414 | case REGULATOR_STATUS_STANDBY: | |
415 | label = "standby"; | |
416 | break; | |
f59c8f9f MB |
417 | case REGULATOR_STATUS_BYPASS: |
418 | label = "bypass"; | |
419 | break; | |
1beaf762 KG |
420 | case REGULATOR_STATUS_UNDEFINED: |
421 | label = "undefined"; | |
422 | break; | |
853116a1 DB |
423 | default: |
424 | return -ERANGE; | |
425 | } | |
426 | ||
427 | return sprintf(buf, "%s\n", label); | |
428 | } | |
429 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
430 | ||
414c70cb LG |
431 | static ssize_t regulator_min_uA_show(struct device *dev, |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | |
436 | if (!rdev->constraints) | |
437 | return sprintf(buf, "constraint not defined\n"); | |
438 | ||
439 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
440 | } | |
7ad68e2f | 441 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
442 | |
443 | static ssize_t regulator_max_uA_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
447 | |
448 | if (!rdev->constraints) | |
449 | return sprintf(buf, "constraint not defined\n"); | |
450 | ||
451 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
452 | } | |
7ad68e2f | 453 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
454 | |
455 | static ssize_t regulator_min_uV_show(struct device *dev, | |
456 | struct device_attribute *attr, char *buf) | |
457 | { | |
a5766f11 | 458 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
459 | |
460 | if (!rdev->constraints) | |
461 | return sprintf(buf, "constraint not defined\n"); | |
462 | ||
463 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
464 | } | |
7ad68e2f | 465 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
466 | |
467 | static ssize_t regulator_max_uV_show(struct device *dev, | |
468 | struct device_attribute *attr, char *buf) | |
469 | { | |
a5766f11 | 470 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
471 | |
472 | if (!rdev->constraints) | |
473 | return sprintf(buf, "constraint not defined\n"); | |
474 | ||
475 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
476 | } | |
7ad68e2f | 477 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
478 | |
479 | static ssize_t regulator_total_uA_show(struct device *dev, | |
480 | struct device_attribute *attr, char *buf) | |
481 | { | |
a5766f11 | 482 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
483 | struct regulator *regulator; |
484 | int uA = 0; | |
485 | ||
486 | mutex_lock(&rdev->mutex); | |
487 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 488 | uA += regulator->uA_load; |
414c70cb LG |
489 | mutex_unlock(&rdev->mutex); |
490 | return sprintf(buf, "%d\n", uA); | |
491 | } | |
7ad68e2f | 492 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 493 | |
587cea27 GKH |
494 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
495 | char *buf) | |
414c70cb | 496 | { |
a5766f11 | 497 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
498 | return sprintf(buf, "%d\n", rdev->use_count); |
499 | } | |
587cea27 | 500 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 501 | |
587cea27 GKH |
502 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
503 | char *buf) | |
414c70cb | 504 | { |
a5766f11 | 505 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
506 | |
507 | switch (rdev->desc->type) { | |
508 | case REGULATOR_VOLTAGE: | |
509 | return sprintf(buf, "voltage\n"); | |
510 | case REGULATOR_CURRENT: | |
511 | return sprintf(buf, "current\n"); | |
512 | } | |
513 | return sprintf(buf, "unknown\n"); | |
514 | } | |
587cea27 | 515 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
516 | |
517 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
518 | struct device_attribute *attr, char *buf) | |
519 | { | |
a5766f11 | 520 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 521 | |
414c70cb LG |
522 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
523 | } | |
7ad68e2f DB |
524 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
525 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
526 | |
527 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
528 | struct device_attribute *attr, char *buf) | |
529 | { | |
a5766f11 | 530 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 531 | |
414c70cb LG |
532 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
533 | } | |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
535 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
414c70cb LG |
542 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
543 | } | |
7ad68e2f DB |
544 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
545 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 546 | |
414c70cb LG |
547 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
548 | struct device_attribute *attr, char *buf) | |
549 | { | |
a5766f11 | 550 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 551 | |
4fca9545 DB |
552 | return regulator_print_opmode(buf, |
553 | rdev->constraints->state_mem.mode); | |
414c70cb | 554 | } |
7ad68e2f DB |
555 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
556 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
557 | |
558 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
559 | struct device_attribute *attr, char *buf) | |
560 | { | |
a5766f11 | 561 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 562 | |
4fca9545 DB |
563 | return regulator_print_opmode(buf, |
564 | rdev->constraints->state_disk.mode); | |
414c70cb | 565 | } |
7ad68e2f DB |
566 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
567 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
568 | |
569 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
a5766f11 | 572 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 573 | |
4fca9545 DB |
574 | return regulator_print_opmode(buf, |
575 | rdev->constraints->state_standby.mode); | |
414c70cb | 576 | } |
7ad68e2f DB |
577 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
578 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
579 | |
580 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
581 | struct device_attribute *attr, char *buf) | |
582 | { | |
a5766f11 | 583 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 584 | |
4fca9545 DB |
585 | return regulator_print_state(buf, |
586 | rdev->constraints->state_mem.enabled); | |
414c70cb | 587 | } |
7ad68e2f DB |
588 | static DEVICE_ATTR(suspend_mem_state, 0444, |
589 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
590 | |
591 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
a5766f11 | 594 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 595 | |
4fca9545 DB |
596 | return regulator_print_state(buf, |
597 | rdev->constraints->state_disk.enabled); | |
414c70cb | 598 | } |
7ad68e2f DB |
599 | static DEVICE_ATTR(suspend_disk_state, 0444, |
600 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
601 | |
602 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
603 | struct device_attribute *attr, char *buf) | |
604 | { | |
a5766f11 | 605 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 606 | |
4fca9545 DB |
607 | return regulator_print_state(buf, |
608 | rdev->constraints->state_standby.enabled); | |
414c70cb | 609 | } |
7ad68e2f DB |
610 | static DEVICE_ATTR(suspend_standby_state, 0444, |
611 | regulator_suspend_standby_state_show, NULL); | |
612 | ||
f59c8f9f MB |
613 | static ssize_t regulator_bypass_show(struct device *dev, |
614 | struct device_attribute *attr, char *buf) | |
615 | { | |
616 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
617 | const char *report; | |
618 | bool bypass; | |
619 | int ret; | |
620 | ||
621 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
622 | ||
623 | if (ret != 0) | |
624 | report = "unknown"; | |
625 | else if (bypass) | |
626 | report = "enabled"; | |
627 | else | |
628 | report = "disabled"; | |
629 | ||
630 | return sprintf(buf, "%s\n", report); | |
631 | } | |
632 | static DEVICE_ATTR(bypass, 0444, | |
633 | regulator_bypass_show, NULL); | |
bc558a60 | 634 | |
7ad68e2f DB |
635 | /* |
636 | * These are the only attributes are present for all regulators. | |
637 | * Other attributes are a function of regulator functionality. | |
638 | */ | |
587cea27 GKH |
639 | static struct attribute *regulator_dev_attrs[] = { |
640 | &dev_attr_name.attr, | |
641 | &dev_attr_num_users.attr, | |
642 | &dev_attr_type.attr, | |
643 | NULL, | |
414c70cb | 644 | }; |
587cea27 | 645 | ATTRIBUTE_GROUPS(regulator_dev); |
414c70cb LG |
646 | |
647 | static void regulator_dev_release(struct device *dev) | |
648 | { | |
a5766f11 | 649 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
650 | kfree(rdev); |
651 | } | |
652 | ||
653 | static struct class regulator_class = { | |
654 | .name = "regulator", | |
655 | .dev_release = regulator_dev_release, | |
587cea27 | 656 | .dev_groups = regulator_dev_groups, |
414c70cb LG |
657 | }; |
658 | ||
659 | /* Calculate the new optimum regulator operating mode based on the new total | |
660 | * consumer load. All locks held by caller */ | |
661 | static void drms_uA_update(struct regulator_dev *rdev) | |
662 | { | |
663 | struct regulator *sibling; | |
664 | int current_uA = 0, output_uV, input_uV, err; | |
665 | unsigned int mode; | |
666 | ||
667 | err = regulator_check_drms(rdev); | |
668 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
669 | (!rdev->desc->ops->get_voltage && |
670 | !rdev->desc->ops->get_voltage_sel) || | |
671 | !rdev->desc->ops->set_mode) | |
036de8ef | 672 | return; |
414c70cb LG |
673 | |
674 | /* get output voltage */ | |
1bf5a1f8 | 675 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
676 | if (output_uV <= 0) |
677 | return; | |
678 | ||
679 | /* get input voltage */ | |
1bf5a1f8 MB |
680 | input_uV = 0; |
681 | if (rdev->supply) | |
3f24f5ad | 682 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 683 | if (input_uV <= 0) |
414c70cb LG |
684 | input_uV = rdev->constraints->input_uV; |
685 | if (input_uV <= 0) | |
686 | return; | |
687 | ||
688 | /* calc total requested load */ | |
689 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 690 | current_uA += sibling->uA_load; |
414c70cb LG |
691 | |
692 | /* now get the optimum mode for our new total regulator load */ | |
693 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
694 | output_uV, current_uA); | |
695 | ||
696 | /* check the new mode is allowed */ | |
2c608234 | 697 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
698 | if (err == 0) |
699 | rdev->desc->ops->set_mode(rdev, mode); | |
700 | } | |
701 | ||
702 | static int suspend_set_state(struct regulator_dev *rdev, | |
703 | struct regulator_state *rstate) | |
704 | { | |
705 | int ret = 0; | |
638f85c5 MB |
706 | |
707 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
708 | * only warn if the driver implements set_suspend_voltage or |
709 | * set_suspend_mode callback. | |
638f85c5 MB |
710 | */ |
711 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
712 | if (rdev->desc->ops->set_suspend_voltage || |
713 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 714 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
715 | return 0; |
716 | } | |
717 | ||
718 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 719 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
720 | return -EINVAL; |
721 | } | |
414c70cb | 722 | |
8ac0e95d | 723 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 724 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 725 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 726 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
727 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
728 | ret = 0; | |
729 | ||
414c70cb | 730 | if (ret < 0) { |
5da84fd9 | 731 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
732 | return ret; |
733 | } | |
734 | ||
735 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
736 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
737 | if (ret < 0) { | |
5da84fd9 | 738 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
739 | return ret; |
740 | } | |
741 | } | |
742 | ||
743 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
744 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
745 | if (ret < 0) { | |
5da84fd9 | 746 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
747 | return ret; |
748 | } | |
749 | } | |
750 | return ret; | |
751 | } | |
752 | ||
753 | /* locks held by caller */ | |
754 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
755 | { | |
756 | if (!rdev->constraints) | |
757 | return -EINVAL; | |
758 | ||
759 | switch (state) { | |
760 | case PM_SUSPEND_STANDBY: | |
761 | return suspend_set_state(rdev, | |
762 | &rdev->constraints->state_standby); | |
763 | case PM_SUSPEND_MEM: | |
764 | return suspend_set_state(rdev, | |
765 | &rdev->constraints->state_mem); | |
766 | case PM_SUSPEND_MAX: | |
767 | return suspend_set_state(rdev, | |
768 | &rdev->constraints->state_disk); | |
769 | default: | |
770 | return -EINVAL; | |
771 | } | |
772 | } | |
773 | ||
774 | static void print_constraints(struct regulator_dev *rdev) | |
775 | { | |
776 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 777 | char buf[80] = ""; |
8f031b48 MB |
778 | int count = 0; |
779 | int ret; | |
414c70cb | 780 | |
8f031b48 | 781 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 782 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
783 | count += sprintf(buf + count, "%d mV ", |
784 | constraints->min_uV / 1000); | |
414c70cb | 785 | else |
8f031b48 MB |
786 | count += sprintf(buf + count, "%d <--> %d mV ", |
787 | constraints->min_uV / 1000, | |
788 | constraints->max_uV / 1000); | |
789 | } | |
790 | ||
791 | if (!constraints->min_uV || | |
792 | constraints->min_uV != constraints->max_uV) { | |
793 | ret = _regulator_get_voltage(rdev); | |
794 | if (ret > 0) | |
795 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
796 | } | |
797 | ||
bf5892a8 MB |
798 | if (constraints->uV_offset) |
799 | count += sprintf(buf, "%dmV offset ", | |
800 | constraints->uV_offset / 1000); | |
801 | ||
8f031b48 | 802 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 803 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
804 | count += sprintf(buf + count, "%d mA ", |
805 | constraints->min_uA / 1000); | |
414c70cb | 806 | else |
8f031b48 MB |
807 | count += sprintf(buf + count, "%d <--> %d mA ", |
808 | constraints->min_uA / 1000, | |
809 | constraints->max_uA / 1000); | |
810 | } | |
811 | ||
812 | if (!constraints->min_uA || | |
813 | constraints->min_uA != constraints->max_uA) { | |
814 | ret = _regulator_get_current_limit(rdev); | |
815 | if (ret > 0) | |
e4a6376b | 816 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 817 | } |
8f031b48 | 818 | |
414c70cb LG |
819 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
820 | count += sprintf(buf + count, "fast "); | |
821 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
822 | count += sprintf(buf + count, "normal "); | |
823 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
824 | count += sprintf(buf + count, "idle "); | |
825 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
826 | count += sprintf(buf + count, "standby"); | |
827 | ||
215b8b05 UKK |
828 | if (!count) |
829 | sprintf(buf, "no parameters"); | |
830 | ||
13ce29f8 | 831 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
832 | |
833 | if ((constraints->min_uV != constraints->max_uV) && | |
834 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
835 | rdev_warn(rdev, | |
836 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
837 | } |
838 | ||
e79055d6 | 839 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 840 | struct regulation_constraints *constraints) |
a5766f11 | 841 | { |
272e2315 | 842 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
843 | int ret; |
844 | ||
845 | /* do we need to apply the constraint voltage */ | |
846 | if (rdev->constraints->apply_uV && | |
75790251 | 847 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
064d5cd1 AB |
848 | int current_uV = _regulator_get_voltage(rdev); |
849 | if (current_uV < 0) { | |
69d58839 NM |
850 | rdev_err(rdev, |
851 | "failed to get the current voltage(%d)\n", | |
852 | current_uV); | |
064d5cd1 AB |
853 | return current_uV; |
854 | } | |
855 | if (current_uV < rdev->constraints->min_uV || | |
856 | current_uV > rdev->constraints->max_uV) { | |
857 | ret = _regulator_do_set_voltage( | |
858 | rdev, rdev->constraints->min_uV, | |
859 | rdev->constraints->max_uV); | |
860 | if (ret < 0) { | |
861 | rdev_err(rdev, | |
69d58839 NM |
862 | "failed to apply %duV constraint(%d)\n", |
863 | rdev->constraints->min_uV, ret); | |
064d5cd1 AB |
864 | return ret; |
865 | } | |
75790251 | 866 | } |
af5866c9 | 867 | } |
e06f5b4f | 868 | |
4367cfdc DB |
869 | /* constrain machine-level voltage specs to fit |
870 | * the actual range supported by this regulator. | |
871 | */ | |
872 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
873 | int count = rdev->desc->n_voltages; | |
874 | int i; | |
875 | int min_uV = INT_MAX; | |
876 | int max_uV = INT_MIN; | |
877 | int cmin = constraints->min_uV; | |
878 | int cmax = constraints->max_uV; | |
879 | ||
3e590918 MB |
880 | /* it's safe to autoconfigure fixed-voltage supplies |
881 | and the constraints are used by list_voltage. */ | |
4367cfdc | 882 | if (count == 1 && !cmin) { |
3e590918 | 883 | cmin = 1; |
4367cfdc | 884 | cmax = INT_MAX; |
3e590918 MB |
885 | constraints->min_uV = cmin; |
886 | constraints->max_uV = cmax; | |
4367cfdc DB |
887 | } |
888 | ||
3e2b9abd MB |
889 | /* voltage constraints are optional */ |
890 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 891 | return 0; |
3e2b9abd | 892 | |
4367cfdc | 893 | /* else require explicit machine-level constraints */ |
3e2b9abd | 894 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 895 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 896 | return -EINVAL; |
4367cfdc DB |
897 | } |
898 | ||
899 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
900 | for (i = 0; i < count; i++) { | |
901 | int value; | |
902 | ||
903 | value = ops->list_voltage(rdev, i); | |
904 | if (value <= 0) | |
905 | continue; | |
906 | ||
907 | /* maybe adjust [min_uV..max_uV] */ | |
908 | if (value >= cmin && value < min_uV) | |
909 | min_uV = value; | |
910 | if (value <= cmax && value > max_uV) | |
911 | max_uV = value; | |
912 | } | |
913 | ||
914 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
915 | if (max_uV < min_uV) { | |
fff15bef MB |
916 | rdev_err(rdev, |
917 | "unsupportable voltage constraints %u-%uuV\n", | |
918 | min_uV, max_uV); | |
e79055d6 | 919 | return -EINVAL; |
4367cfdc DB |
920 | } |
921 | ||
922 | /* use regulator's subset of machine constraints */ | |
923 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
924 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
925 | constraints->min_uV, min_uV); | |
4367cfdc DB |
926 | constraints->min_uV = min_uV; |
927 | } | |
928 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
929 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
930 | constraints->max_uV, max_uV); | |
4367cfdc DB |
931 | constraints->max_uV = max_uV; |
932 | } | |
933 | } | |
934 | ||
e79055d6 MB |
935 | return 0; |
936 | } | |
937 | ||
f8c1700d LD |
938 | static int machine_constraints_current(struct regulator_dev *rdev, |
939 | struct regulation_constraints *constraints) | |
940 | { | |
272e2315 | 941 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
942 | int ret; |
943 | ||
944 | if (!constraints->min_uA && !constraints->max_uA) | |
945 | return 0; | |
946 | ||
947 | if (constraints->min_uA > constraints->max_uA) { | |
948 | rdev_err(rdev, "Invalid current constraints\n"); | |
949 | return -EINVAL; | |
950 | } | |
951 | ||
952 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
953 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | /* Set regulator current in constraints range */ | |
958 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
959 | constraints->max_uA); | |
960 | if (ret < 0) { | |
961 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
962 | return ret; | |
963 | } | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
30c21971 MP |
968 | static int _regulator_do_enable(struct regulator_dev *rdev); |
969 | ||
e79055d6 MB |
970 | /** |
971 | * set_machine_constraints - sets regulator constraints | |
972 | * @rdev: regulator source | |
973 | * @constraints: constraints to apply | |
974 | * | |
975 | * Allows platform initialisation code to define and constrain | |
976 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
977 | * Constraints *must* be set by platform code in order for some | |
978 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
979 | * set_mode. | |
980 | */ | |
981 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 982 | const struct regulation_constraints *constraints) |
e79055d6 MB |
983 | { |
984 | int ret = 0; | |
272e2315 | 985 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 986 | |
9a8f5e07 MB |
987 | if (constraints) |
988 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
989 | GFP_KERNEL); | |
990 | else | |
991 | rdev->constraints = kzalloc(sizeof(*constraints), | |
992 | GFP_KERNEL); | |
f8c12fe3 MB |
993 | if (!rdev->constraints) |
994 | return -ENOMEM; | |
af5866c9 | 995 | |
f8c12fe3 | 996 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
997 | if (ret != 0) |
998 | goto out; | |
999 | ||
f8c1700d | 1000 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 MB |
1001 | if (ret != 0) |
1002 | goto out; | |
1003 | ||
a5766f11 | 1004 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1005 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1006 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1007 | if (ret < 0) { |
5da84fd9 | 1008 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
1009 | goto out; |
1010 | } | |
1011 | } | |
a5766f11 | 1012 | |
9a8f5e07 | 1013 | if (rdev->constraints->initial_mode) { |
a308466c | 1014 | if (!ops->set_mode) { |
5da84fd9 | 1015 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
1016 | ret = -EINVAL; |
1017 | goto out; | |
1018 | } | |
1019 | ||
f8c12fe3 | 1020 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1021 | if (ret < 0) { |
5da84fd9 | 1022 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
1023 | goto out; |
1024 | } | |
1025 | } | |
1026 | ||
cacf90f2 MB |
1027 | /* If the constraints say the regulator should be on at this point |
1028 | * and we have control then make sure it is enabled. | |
1029 | */ | |
30c21971 MP |
1030 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1031 | ret = _regulator_do_enable(rdev); | |
1032 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1033 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
1034 | goto out; |
1035 | } | |
1036 | } | |
1037 | ||
1653ccf4 YSB |
1038 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1039 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1040 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1041 | if (ret < 0) { | |
1042 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
1043 | goto out; | |
1044 | } | |
1045 | } | |
1046 | ||
a5766f11 | 1047 | print_constraints(rdev); |
1a6958e7 | 1048 | return 0; |
a5766f11 | 1049 | out: |
1a6958e7 AL |
1050 | kfree(rdev->constraints); |
1051 | rdev->constraints = NULL; | |
a5766f11 LG |
1052 | return ret; |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1057 | * @rdev: regulator name |
1058 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1059 | * |
1060 | * Called by platform initialisation code to set the supply regulator for this | |
1061 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1062 | * core if it's child is enabled. | |
1063 | */ | |
1064 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1065 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1066 | { |
1067 | int err; | |
1068 | ||
3801b86a MB |
1069 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1070 | ||
1071 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1072 | if (rdev->supply == NULL) { |
1073 | err = -ENOMEM; | |
3801b86a | 1074 | return err; |
a5766f11 | 1075 | } |
57ad526a | 1076 | supply_rdev->open_count++; |
3801b86a MB |
1077 | |
1078 | return 0; | |
a5766f11 LG |
1079 | } |
1080 | ||
1081 | /** | |
06c63f93 | 1082 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1083 | * @rdev: regulator source |
40f9244f | 1084 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1085 | * @supply: symbolic name for supply |
a5766f11 LG |
1086 | * |
1087 | * Allows platform initialisation code to map physical regulator | |
1088 | * sources to symbolic names for supplies for use by devices. Devices | |
1089 | * should use these symbolic names to request regulators, avoiding the | |
1090 | * need to provide board-specific regulator names as platform data. | |
1091 | */ | |
1092 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1093 | const char *consumer_dev_name, |
1094 | const char *supply) | |
a5766f11 LG |
1095 | { |
1096 | struct regulator_map *node; | |
9ed2099e | 1097 | int has_dev; |
a5766f11 LG |
1098 | |
1099 | if (supply == NULL) | |
1100 | return -EINVAL; | |
1101 | ||
9ed2099e MB |
1102 | if (consumer_dev_name != NULL) |
1103 | has_dev = 1; | |
1104 | else | |
1105 | has_dev = 0; | |
1106 | ||
6001e13c | 1107 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1108 | if (node->dev_name && consumer_dev_name) { |
1109 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1110 | continue; | |
1111 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1112 | continue; |
23b5cc2a JN |
1113 | } |
1114 | ||
6001e13c DB |
1115 | if (strcmp(node->supply, supply) != 0) |
1116 | continue; | |
1117 | ||
737f360d MB |
1118 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1119 | consumer_dev_name, | |
1120 | dev_name(&node->regulator->dev), | |
1121 | node->regulator->desc->name, | |
1122 | supply, | |
1123 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1124 | return -EBUSY; |
1125 | } | |
1126 | ||
9ed2099e | 1127 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1128 | if (node == NULL) |
1129 | return -ENOMEM; | |
1130 | ||
1131 | node->regulator = rdev; | |
a5766f11 LG |
1132 | node->supply = supply; |
1133 | ||
9ed2099e MB |
1134 | if (has_dev) { |
1135 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1136 | if (node->dev_name == NULL) { | |
1137 | kfree(node); | |
1138 | return -ENOMEM; | |
1139 | } | |
40f9244f MB |
1140 | } |
1141 | ||
a5766f11 LG |
1142 | list_add(&node->list, ®ulator_map_list); |
1143 | return 0; | |
1144 | } | |
1145 | ||
0f1d747b MR |
1146 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1147 | { | |
1148 | struct regulator_map *node, *n; | |
1149 | ||
1150 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1151 | if (rdev == node->regulator) { | |
1152 | list_del(&node->list); | |
40f9244f | 1153 | kfree(node->dev_name); |
0f1d747b | 1154 | kfree(node); |
0f1d747b MR |
1155 | } |
1156 | } | |
1157 | } | |
1158 | ||
f5726ae3 | 1159 | #define REG_STR_SIZE 64 |
414c70cb LG |
1160 | |
1161 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1162 | struct device *dev, | |
1163 | const char *supply_name) | |
1164 | { | |
1165 | struct regulator *regulator; | |
1166 | char buf[REG_STR_SIZE]; | |
1167 | int err, size; | |
1168 | ||
1169 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1170 | if (regulator == NULL) | |
1171 | return NULL; | |
1172 | ||
1173 | mutex_lock(&rdev->mutex); | |
1174 | regulator->rdev = rdev; | |
1175 | list_add(®ulator->list, &rdev->consumer_list); | |
1176 | ||
1177 | if (dev) { | |
e2c98eaf SG |
1178 | regulator->dev = dev; |
1179 | ||
222cc7b1 | 1180 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1181 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1182 | dev->kobj.name, supply_name); | |
1183 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1184 | goto overflow_err; |
414c70cb LG |
1185 | |
1186 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1187 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1188 | goto overflow_err; |
414c70cb LG |
1189 | |
1190 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1191 | buf); | |
1192 | if (err) { | |
5da84fd9 JP |
1193 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1194 | dev->kobj.name, err); | |
222cc7b1 | 1195 | /* non-fatal */ |
414c70cb | 1196 | } |
5de70519 MB |
1197 | } else { |
1198 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1199 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1200 | goto overflow_err; |
5de70519 MB |
1201 | } |
1202 | ||
5de70519 MB |
1203 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1204 | rdev->debugfs); | |
24751434 | 1205 | if (!regulator->debugfs) { |
5de70519 | 1206 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1207 | } else { |
1208 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1209 | ®ulator->uA_load); | |
1210 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1211 | ®ulator->min_uV); | |
1212 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1213 | ®ulator->max_uV); | |
414c70cb | 1214 | } |
5de70519 | 1215 | |
6492bc1b MB |
1216 | /* |
1217 | * Check now if the regulator is an always on regulator - if | |
1218 | * it is then we don't need to do nearly so much work for | |
1219 | * enable/disable calls. | |
1220 | */ | |
1221 | if (!_regulator_can_change_status(rdev) && | |
1222 | _regulator_is_enabled(rdev)) | |
1223 | regulator->always_on = true; | |
1224 | ||
414c70cb LG |
1225 | mutex_unlock(&rdev->mutex); |
1226 | return regulator; | |
414c70cb LG |
1227 | overflow_err: |
1228 | list_del(®ulator->list); | |
1229 | kfree(regulator); | |
1230 | mutex_unlock(&rdev->mutex); | |
1231 | return NULL; | |
1232 | } | |
1233 | ||
31aae2be MB |
1234 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1235 | { | |
00c877c6 LD |
1236 | if (rdev->constraints && rdev->constraints->enable_time) |
1237 | return rdev->constraints->enable_time; | |
31aae2be | 1238 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1239 | return rdev->desc->enable_time; |
31aae2be MB |
1240 | return rdev->desc->ops->enable_time(rdev); |
1241 | } | |
1242 | ||
a06ccd9c CK |
1243 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1244 | struct device *dev, const char *supply) | |
1245 | { | |
1246 | struct regulator_supply_alias *map; | |
1247 | ||
1248 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1249 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1250 | return map; | |
1251 | ||
1252 | return NULL; | |
1253 | } | |
1254 | ||
1255 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1256 | { | |
1257 | struct regulator_supply_alias *map; | |
1258 | ||
1259 | map = regulator_find_supply_alias(*dev, *supply); | |
1260 | if (map) { | |
1261 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1262 | *supply, map->alias_supply, | |
1263 | dev_name(map->alias_dev)); | |
1264 | *dev = map->alias_dev; | |
1265 | *supply = map->alias_supply; | |
1266 | } | |
1267 | } | |
1268 | ||
69511a45 | 1269 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1270 | const char *supply, |
1271 | int *ret) | |
69511a45 RN |
1272 | { |
1273 | struct regulator_dev *r; | |
1274 | struct device_node *node; | |
576ca436 MB |
1275 | struct regulator_map *map; |
1276 | const char *devname = NULL; | |
69511a45 | 1277 | |
a06ccd9c CK |
1278 | regulator_supply_alias(&dev, &supply); |
1279 | ||
69511a45 RN |
1280 | /* first do a dt based lookup */ |
1281 | if (dev && dev->of_node) { | |
1282 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1283 | if (node) { |
69511a45 RN |
1284 | list_for_each_entry(r, ®ulator_list, list) |
1285 | if (r->dev.parent && | |
1286 | node == r->dev.of_node) | |
1287 | return r; | |
317b5684 MB |
1288 | *ret = -EPROBE_DEFER; |
1289 | return NULL; | |
6d191a5f MB |
1290 | } else { |
1291 | /* | |
1292 | * If we couldn't even get the node then it's | |
1293 | * not just that the device didn't register | |
1294 | * yet, there's no node and we'll never | |
1295 | * succeed. | |
1296 | */ | |
1297 | *ret = -ENODEV; | |
1298 | } | |
69511a45 RN |
1299 | } |
1300 | ||
1301 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1302 | if (dev) |
1303 | devname = dev_name(dev); | |
1304 | ||
69511a45 RN |
1305 | list_for_each_entry(r, ®ulator_list, list) |
1306 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1307 | return r; | |
1308 | ||
576ca436 MB |
1309 | list_for_each_entry(map, ®ulator_map_list, list) { |
1310 | /* If the mapping has a device set up it must match */ | |
1311 | if (map->dev_name && | |
1312 | (!devname || strcmp(map->dev_name, devname))) | |
1313 | continue; | |
1314 | ||
1315 | if (strcmp(map->supply, supply) == 0) | |
1316 | return map->regulator; | |
1317 | } | |
1318 | ||
1319 | ||
69511a45 RN |
1320 | return NULL; |
1321 | } | |
1322 | ||
5ffbd136 MB |
1323 | /* Internal regulator request function */ |
1324 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1325 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1326 | { |
1327 | struct regulator_dev *rdev; | |
04bf3011 | 1328 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1329 | const char *devname = NULL; |
317b5684 | 1330 | int ret; |
414c70cb LG |
1331 | |
1332 | if (id == NULL) { | |
5da84fd9 | 1333 | pr_err("get() with no identifier\n"); |
043c998f | 1334 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1335 | } |
1336 | ||
40f9244f MB |
1337 | if (dev) |
1338 | devname = dev_name(dev); | |
1339 | ||
317b5684 MB |
1340 | if (have_full_constraints()) |
1341 | ret = -ENODEV; | |
1342 | else | |
1343 | ret = -EPROBE_DEFER; | |
1344 | ||
414c70cb LG |
1345 | mutex_lock(®ulator_list_mutex); |
1346 | ||
6d191a5f | 1347 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1348 | if (rdev) |
1349 | goto found; | |
1350 | ||
ef60abbb MB |
1351 | regulator = ERR_PTR(ret); |
1352 | ||
1e4b545c NM |
1353 | /* |
1354 | * If we have return value from dev_lookup fail, we do not expect to | |
1355 | * succeed, so, quit with appropriate error value | |
1356 | */ | |
0d25d09d | 1357 | if (ret && ret != -ENODEV) |
1e4b545c | 1358 | goto out; |
1e4b545c | 1359 | |
34abbd68 MB |
1360 | if (!devname) |
1361 | devname = "deviceless"; | |
1362 | ||
4ddfebd3 MB |
1363 | /* |
1364 | * Assume that a regulator is physically present and enabled | |
1365 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1366 | */ |
87b28417 | 1367 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1368 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1369 | devname, id); | |
4ddfebd3 | 1370 | |
34abbd68 MB |
1371 | rdev = dummy_regulator_rdev; |
1372 | goto found; | |
0781719b HG |
1373 | /* Don't log an error when called from regulator_get_optional() */ |
1374 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1375 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1376 | } |
34abbd68 | 1377 | |
414c70cb LG |
1378 | mutex_unlock(®ulator_list_mutex); |
1379 | return regulator; | |
1380 | ||
1381 | found: | |
5ffbd136 MB |
1382 | if (rdev->exclusive) { |
1383 | regulator = ERR_PTR(-EPERM); | |
1384 | goto out; | |
1385 | } | |
1386 | ||
1387 | if (exclusive && rdev->open_count) { | |
1388 | regulator = ERR_PTR(-EBUSY); | |
1389 | goto out; | |
1390 | } | |
1391 | ||
a5766f11 LG |
1392 | if (!try_module_get(rdev->owner)) |
1393 | goto out; | |
1394 | ||
414c70cb LG |
1395 | regulator = create_regulator(rdev, dev, id); |
1396 | if (regulator == NULL) { | |
1397 | regulator = ERR_PTR(-ENOMEM); | |
1398 | module_put(rdev->owner); | |
bcda4321 | 1399 | goto out; |
414c70cb LG |
1400 | } |
1401 | ||
5ffbd136 MB |
1402 | rdev->open_count++; |
1403 | if (exclusive) { | |
1404 | rdev->exclusive = 1; | |
1405 | ||
1406 | ret = _regulator_is_enabled(rdev); | |
1407 | if (ret > 0) | |
1408 | rdev->use_count = 1; | |
1409 | else | |
1410 | rdev->use_count = 0; | |
1411 | } | |
1412 | ||
a5766f11 | 1413 | out: |
414c70cb | 1414 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1415 | |
414c70cb LG |
1416 | return regulator; |
1417 | } | |
5ffbd136 MB |
1418 | |
1419 | /** | |
1420 | * regulator_get - lookup and obtain a reference to a regulator. | |
1421 | * @dev: device for regulator "consumer" | |
1422 | * @id: Supply name or regulator ID. | |
1423 | * | |
1424 | * Returns a struct regulator corresponding to the regulator producer, | |
1425 | * or IS_ERR() condition containing errno. | |
1426 | * | |
1427 | * Use of supply names configured via regulator_set_device_supply() is | |
1428 | * strongly encouraged. It is recommended that the supply name used | |
1429 | * should match the name used for the supply and/or the relevant | |
1430 | * device pins in the datasheet. | |
1431 | */ | |
1432 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1433 | { | |
4ddfebd3 | 1434 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1435 | } |
414c70cb LG |
1436 | EXPORT_SYMBOL_GPL(regulator_get); |
1437 | ||
5ffbd136 MB |
1438 | /** |
1439 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1440 | * @dev: device for regulator "consumer" | |
1441 | * @id: Supply name or regulator ID. | |
1442 | * | |
1443 | * Returns a struct regulator corresponding to the regulator producer, | |
1444 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1445 | * unable to obtain this regulator while this reference is held and the |
1446 | * use count for the regulator will be initialised to reflect the current | |
1447 | * state of the regulator. | |
5ffbd136 MB |
1448 | * |
1449 | * This is intended for use by consumers which cannot tolerate shared | |
1450 | * use of the regulator such as those which need to force the | |
1451 | * regulator off for correct operation of the hardware they are | |
1452 | * controlling. | |
1453 | * | |
1454 | * Use of supply names configured via regulator_set_device_supply() is | |
1455 | * strongly encouraged. It is recommended that the supply name used | |
1456 | * should match the name used for the supply and/or the relevant | |
1457 | * device pins in the datasheet. | |
1458 | */ | |
1459 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1460 | { | |
4ddfebd3 | 1461 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1462 | } |
1463 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1464 | ||
de1dd9fd MB |
1465 | /** |
1466 | * regulator_get_optional - obtain optional access to a regulator. | |
1467 | * @dev: device for regulator "consumer" | |
1468 | * @id: Supply name or regulator ID. | |
1469 | * | |
1470 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1471 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1472 | * |
1473 | * This is intended for use by consumers for devices which can have | |
1474 | * some supplies unconnected in normal use, such as some MMC devices. | |
1475 | * It can allow the regulator core to provide stub supplies for other | |
1476 | * supplies requested using normal regulator_get() calls without | |
1477 | * disrupting the operation of drivers that can handle absent | |
1478 | * supplies. | |
1479 | * | |
1480 | * Use of supply names configured via regulator_set_device_supply() is | |
1481 | * strongly encouraged. It is recommended that the supply name used | |
1482 | * should match the name used for the supply and/or the relevant | |
1483 | * device pins in the datasheet. | |
1484 | */ | |
1485 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1486 | { | |
4ddfebd3 | 1487 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1488 | } |
1489 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1490 | ||
23ff2f0f CK |
1491 | /* Locks held by regulator_put() */ |
1492 | static void _regulator_put(struct regulator *regulator) | |
414c70cb LG |
1493 | { |
1494 | struct regulator_dev *rdev; | |
1495 | ||
1496 | if (regulator == NULL || IS_ERR(regulator)) | |
1497 | return; | |
1498 | ||
414c70cb LG |
1499 | rdev = regulator->rdev; |
1500 | ||
5de70519 | 1501 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1502 | |
414c70cb | 1503 | /* remove any sysfs entries */ |
e2c98eaf | 1504 | if (regulator->dev) |
414c70cb | 1505 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
5de70519 | 1506 | kfree(regulator->supply_name); |
414c70cb LG |
1507 | list_del(®ulator->list); |
1508 | kfree(regulator); | |
1509 | ||
5ffbd136 MB |
1510 | rdev->open_count--; |
1511 | rdev->exclusive = 0; | |
1512 | ||
414c70cb | 1513 | module_put(rdev->owner); |
23ff2f0f CK |
1514 | } |
1515 | ||
1516 | /** | |
1517 | * regulator_put - "free" the regulator source | |
1518 | * @regulator: regulator source | |
1519 | * | |
1520 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1521 | * regulator source are balanced by regulator_disable calls prior to calling | |
1522 | * this function. | |
1523 | */ | |
1524 | void regulator_put(struct regulator *regulator) | |
1525 | { | |
1526 | mutex_lock(®ulator_list_mutex); | |
1527 | _regulator_put(regulator); | |
414c70cb LG |
1528 | mutex_unlock(®ulator_list_mutex); |
1529 | } | |
1530 | EXPORT_SYMBOL_GPL(regulator_put); | |
1531 | ||
a06ccd9c CK |
1532 | /** |
1533 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1534 | * | |
1535 | * @dev: device that will be given as the regulator "consumer" | |
1536 | * @id: Supply name or regulator ID | |
1537 | * @alias_dev: device that should be used to lookup the supply | |
1538 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1539 | * supply | |
1540 | * | |
1541 | * All lookups for id on dev will instead be conducted for alias_id on | |
1542 | * alias_dev. | |
1543 | */ | |
1544 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1545 | struct device *alias_dev, | |
1546 | const char *alias_id) | |
1547 | { | |
1548 | struct regulator_supply_alias *map; | |
1549 | ||
1550 | map = regulator_find_supply_alias(dev, id); | |
1551 | if (map) | |
1552 | return -EEXIST; | |
1553 | ||
1554 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1555 | if (!map) | |
1556 | return -ENOMEM; | |
1557 | ||
1558 | map->src_dev = dev; | |
1559 | map->src_supply = id; | |
1560 | map->alias_dev = alias_dev; | |
1561 | map->alias_supply = alias_id; | |
1562 | ||
1563 | list_add(&map->list, ®ulator_supply_alias_list); | |
1564 | ||
1565 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1566 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1571 | ||
1572 | /** | |
1573 | * regulator_unregister_supply_alias - Remove device alias | |
1574 | * | |
1575 | * @dev: device that will be given as the regulator "consumer" | |
1576 | * @id: Supply name or regulator ID | |
1577 | * | |
1578 | * Remove a lookup alias if one exists for id on dev. | |
1579 | */ | |
1580 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1581 | { | |
1582 | struct regulator_supply_alias *map; | |
1583 | ||
1584 | map = regulator_find_supply_alias(dev, id); | |
1585 | if (map) { | |
1586 | list_del(&map->list); | |
1587 | kfree(map); | |
1588 | } | |
1589 | } | |
1590 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1591 | ||
1592 | /** | |
1593 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1594 | * | |
1595 | * @dev: device that will be given as the regulator "consumer" | |
1596 | * @id: List of supply names or regulator IDs | |
1597 | * @alias_dev: device that should be used to lookup the supply | |
1598 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1599 | * lookup the supply | |
1600 | * @num_id: Number of aliases to register | |
1601 | * | |
1602 | * @return 0 on success, an errno on failure. | |
1603 | * | |
1604 | * This helper function allows drivers to register several supply | |
1605 | * aliases in one operation. If any of the aliases cannot be | |
1606 | * registered any aliases that were registered will be removed | |
1607 | * before returning to the caller. | |
1608 | */ | |
9f8c0fe9 LJ |
1609 | int regulator_bulk_register_supply_alias(struct device *dev, |
1610 | const char *const *id, | |
a06ccd9c | 1611 | struct device *alias_dev, |
9f8c0fe9 | 1612 | const char *const *alias_id, |
a06ccd9c CK |
1613 | int num_id) |
1614 | { | |
1615 | int i; | |
1616 | int ret; | |
1617 | ||
1618 | for (i = 0; i < num_id; ++i) { | |
1619 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1620 | alias_id[i]); | |
1621 | if (ret < 0) | |
1622 | goto err; | |
1623 | } | |
1624 | ||
1625 | return 0; | |
1626 | ||
1627 | err: | |
1628 | dev_err(dev, | |
1629 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1630 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1631 | ||
1632 | while (--i >= 0) | |
1633 | regulator_unregister_supply_alias(dev, id[i]); | |
1634 | ||
1635 | return ret; | |
1636 | } | |
1637 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1638 | ||
1639 | /** | |
1640 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1641 | * | |
1642 | * @dev: device that will be given as the regulator "consumer" | |
1643 | * @id: List of supply names or regulator IDs | |
1644 | * @num_id: Number of aliases to unregister | |
1645 | * | |
1646 | * This helper function allows drivers to unregister several supply | |
1647 | * aliases in one operation. | |
1648 | */ | |
1649 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1650 | const char *const *id, |
a06ccd9c CK |
1651 | int num_id) |
1652 | { | |
1653 | int i; | |
1654 | ||
1655 | for (i = 0; i < num_id; ++i) | |
1656 | regulator_unregister_supply_alias(dev, id[i]); | |
1657 | } | |
1658 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1659 | ||
1660 | ||
f19b00da KM |
1661 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1662 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1663 | const struct regulator_config *config) | |
1664 | { | |
1665 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1666 | struct gpio_desc *gpiod; |
f19b00da KM |
1667 | int ret; |
1668 | ||
778b28b4 RK |
1669 | gpiod = gpio_to_desc(config->ena_gpio); |
1670 | ||
f19b00da | 1671 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1672 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1673 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1674 | config->ena_gpio); | |
1675 | goto update_ena_gpio_to_rdev; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | ret = gpio_request_one(config->ena_gpio, | |
1680 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1681 | rdev_get_name(rdev)); | |
1682 | if (ret) | |
1683 | return ret; | |
1684 | ||
1685 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1686 | if (pin == NULL) { | |
1687 | gpio_free(config->ena_gpio); | |
1688 | return -ENOMEM; | |
1689 | } | |
1690 | ||
778b28b4 | 1691 | pin->gpiod = gpiod; |
f19b00da KM |
1692 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1693 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1694 | ||
1695 | update_ena_gpio_to_rdev: | |
1696 | pin->request_count++; | |
1697 | rdev->ena_pin = pin; | |
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1702 | { | |
1703 | struct regulator_enable_gpio *pin, *n; | |
1704 | ||
1705 | if (!rdev->ena_pin) | |
1706 | return; | |
1707 | ||
1708 | /* Free the GPIO only in case of no use */ | |
1709 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1710 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1711 | if (pin->request_count <= 1) { |
1712 | pin->request_count = 0; | |
778b28b4 | 1713 | gpiod_put(pin->gpiod); |
f19b00da KM |
1714 | list_del(&pin->list); |
1715 | kfree(pin); | |
1716 | } else { | |
1717 | pin->request_count--; | |
1718 | } | |
1719 | } | |
1720 | } | |
1721 | } | |
1722 | ||
967cfb18 | 1723 | /** |
31d6eebf RD |
1724 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1725 | * @rdev: regulator_dev structure | |
1726 | * @enable: enable GPIO at initial use? | |
1727 | * | |
967cfb18 KM |
1728 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1729 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1730 | */ | |
1731 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1732 | { | |
1733 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1734 | ||
1735 | if (!pin) | |
1736 | return -EINVAL; | |
1737 | ||
1738 | if (enable) { | |
1739 | /* Enable GPIO at initial use */ | |
1740 | if (pin->enable_count == 0) | |
778b28b4 RK |
1741 | gpiod_set_value_cansleep(pin->gpiod, |
1742 | !pin->ena_gpio_invert); | |
967cfb18 KM |
1743 | |
1744 | pin->enable_count++; | |
1745 | } else { | |
1746 | if (pin->enable_count > 1) { | |
1747 | pin->enable_count--; | |
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | /* Disable GPIO if not used */ | |
1752 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
1753 | gpiod_set_value_cansleep(pin->gpiod, |
1754 | pin->ena_gpio_invert); | |
967cfb18 KM |
1755 | pin->enable_count = 0; |
1756 | } | |
1757 | } | |
1758 | ||
1759 | return 0; | |
1760 | } | |
1761 | ||
79fd1141 GX |
1762 | /** |
1763 | * _regulator_enable_delay - a delay helper function | |
1764 | * @delay: time to delay in microseconds | |
1765 | * | |
1766 | * Delay for the requested amount of time as per the guidelines in: | |
1767 | * | |
1768 | * Documentation/timers/timers-howto.txt | |
1769 | * | |
1770 | * The assumption here is that regulators will never be enabled in | |
1771 | * atomic context and therefore sleeping functions can be used. | |
1772 | */ | |
1773 | static void _regulator_enable_delay(unsigned int delay) | |
1774 | { | |
1775 | unsigned int ms = delay / 1000; | |
1776 | unsigned int us = delay % 1000; | |
1777 | ||
1778 | if (ms > 0) { | |
1779 | /* | |
1780 | * For small enough values, handle super-millisecond | |
1781 | * delays in the usleep_range() call below. | |
1782 | */ | |
1783 | if (ms < 20) | |
1784 | us += ms * 1000; | |
1785 | else | |
1786 | msleep(ms); | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * Give the scheduler some room to coalesce with any other | |
1791 | * wakeup sources. For delays shorter than 10 us, don't even | |
1792 | * bother setting up high-resolution timers and just busy- | |
1793 | * loop. | |
1794 | */ | |
1795 | if (us >= 10) | |
1796 | usleep_range(us, us + 100); | |
1797 | else | |
1798 | udelay(us); | |
1799 | } | |
1800 | ||
5c5659d0 MB |
1801 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1802 | { | |
1803 | int ret, delay; | |
1804 | ||
1805 | /* Query before enabling in case configuration dependent. */ | |
1806 | ret = _regulator_get_enable_time(rdev); | |
1807 | if (ret >= 0) { | |
1808 | delay = ret; | |
1809 | } else { | |
1810 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1811 | delay = 0; | |
1812 | } | |
1813 | ||
1814 | trace_regulator_enable(rdev_get_name(rdev)); | |
1815 | ||
871f5650 GX |
1816 | if (rdev->desc->off_on_delay) { |
1817 | /* if needed, keep a distance of off_on_delay from last time | |
1818 | * this regulator was disabled. | |
1819 | */ | |
1820 | unsigned long start_jiffy = jiffies; | |
1821 | unsigned long intended, max_delay, remaining; | |
1822 | ||
1823 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
1824 | intended = rdev->last_off_jiffy + max_delay; | |
1825 | ||
1826 | if (time_before(start_jiffy, intended)) { | |
1827 | /* calc remaining jiffies to deal with one-time | |
1828 | * timer wrapping. | |
1829 | * in case of multiple timer wrapping, either it can be | |
1830 | * detected by out-of-range remaining, or it cannot be | |
1831 | * detected and we gets a panelty of | |
1832 | * _regulator_enable_delay(). | |
1833 | */ | |
1834 | remaining = intended - start_jiffy; | |
1835 | if (remaining <= max_delay) | |
1836 | _regulator_enable_delay( | |
1837 | jiffies_to_usecs(remaining)); | |
1838 | } | |
1839 | } | |
1840 | ||
967cfb18 KM |
1841 | if (rdev->ena_pin) { |
1842 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1843 | if (ret < 0) | |
1844 | return ret; | |
65f73508 MB |
1845 | rdev->ena_gpio_state = 1; |
1846 | } else if (rdev->desc->ops->enable) { | |
5c5659d0 MB |
1847 | ret = rdev->desc->ops->enable(rdev); |
1848 | if (ret < 0) | |
1849 | return ret; | |
1850 | } else { | |
1851 | return -EINVAL; | |
1852 | } | |
1853 | ||
1854 | /* Allow the regulator to ramp; it would be useful to extend | |
1855 | * this for bulk operations so that the regulators can ramp | |
1856 | * together. */ | |
1857 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1858 | ||
79fd1141 | 1859 | _regulator_enable_delay(delay); |
5c5659d0 MB |
1860 | |
1861 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
414c70cb LG |
1866 | /* locks held by regulator_enable() */ |
1867 | static int _regulator_enable(struct regulator_dev *rdev) | |
1868 | { | |
5c5659d0 | 1869 | int ret; |
414c70cb | 1870 | |
414c70cb | 1871 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1872 | if (rdev->constraints && |
1873 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1874 | drms_uA_update(rdev); | |
414c70cb | 1875 | |
9a2372fa MB |
1876 | if (rdev->use_count == 0) { |
1877 | /* The regulator may on if it's not switchable or left on */ | |
1878 | ret = _regulator_is_enabled(rdev); | |
1879 | if (ret == -EINVAL || ret == 0) { | |
1880 | if (!_regulator_can_change_status(rdev)) | |
1881 | return -EPERM; | |
1882 | ||
5c5659d0 | 1883 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1884 | if (ret < 0) |
1885 | return ret; | |
1886 | ||
a7433cff | 1887 | } else if (ret < 0) { |
5da84fd9 | 1888 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1889 | return ret; |
1890 | } | |
a7433cff | 1891 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1892 | } |
1893 | ||
9a2372fa MB |
1894 | rdev->use_count++; |
1895 | ||
1896 | return 0; | |
414c70cb LG |
1897 | } |
1898 | ||
1899 | /** | |
1900 | * regulator_enable - enable regulator output | |
1901 | * @regulator: regulator source | |
1902 | * | |
cf7bbcdf MB |
1903 | * Request that the regulator be enabled with the regulator output at |
1904 | * the predefined voltage or current value. Calls to regulator_enable() | |
1905 | * must be balanced with calls to regulator_disable(). | |
1906 | * | |
414c70cb | 1907 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1908 | * hardwired in the regulator. |
414c70cb LG |
1909 | */ |
1910 | int regulator_enable(struct regulator *regulator) | |
1911 | { | |
412aec61 DB |
1912 | struct regulator_dev *rdev = regulator->rdev; |
1913 | int ret = 0; | |
414c70cb | 1914 | |
6492bc1b MB |
1915 | if (regulator->always_on) |
1916 | return 0; | |
1917 | ||
3801b86a MB |
1918 | if (rdev->supply) { |
1919 | ret = regulator_enable(rdev->supply); | |
1920 | if (ret != 0) | |
1921 | return ret; | |
1922 | } | |
1923 | ||
412aec61 | 1924 | mutex_lock(&rdev->mutex); |
cd94b505 | 1925 | ret = _regulator_enable(rdev); |
412aec61 | 1926 | mutex_unlock(&rdev->mutex); |
3801b86a | 1927 | |
d1685e4e | 1928 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1929 | regulator_disable(rdev->supply); |
1930 | ||
414c70cb LG |
1931 | return ret; |
1932 | } | |
1933 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1934 | ||
5c5659d0 MB |
1935 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1936 | { | |
1937 | int ret; | |
1938 | ||
1939 | trace_regulator_disable(rdev_get_name(rdev)); | |
1940 | ||
967cfb18 KM |
1941 | if (rdev->ena_pin) { |
1942 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
1943 | if (ret < 0) | |
1944 | return ret; | |
5c5659d0 MB |
1945 | rdev->ena_gpio_state = 0; |
1946 | ||
1947 | } else if (rdev->desc->ops->disable) { | |
1948 | ret = rdev->desc->ops->disable(rdev); | |
1949 | if (ret != 0) | |
1950 | return ret; | |
1951 | } | |
1952 | ||
871f5650 GX |
1953 | /* cares about last_off_jiffy only if off_on_delay is required by |
1954 | * device. | |
1955 | */ | |
1956 | if (rdev->desc->off_on_delay) | |
1957 | rdev->last_off_jiffy = jiffies; | |
1958 | ||
5c5659d0 MB |
1959 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1960 | ||
5c5659d0 MB |
1961 | return 0; |
1962 | } | |
1963 | ||
414c70cb | 1964 | /* locks held by regulator_disable() */ |
3801b86a | 1965 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1966 | { |
1967 | int ret = 0; | |
1968 | ||
cd94b505 | 1969 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1970 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1971 | return -EIO; |
1972 | ||
414c70cb | 1973 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1974 | if (rdev->use_count == 1 && |
1975 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1976 | |
1977 | /* we are last user */ | |
5c5659d0 MB |
1978 | if (_regulator_can_change_status(rdev)) { |
1979 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1980 | if (ret < 0) { |
5da84fd9 | 1981 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1982 | return ret; |
1983 | } | |
66fda75f MP |
1984 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1985 | NULL); | |
414c70cb LG |
1986 | } |
1987 | ||
414c70cb LG |
1988 | rdev->use_count = 0; |
1989 | } else if (rdev->use_count > 1) { | |
1990 | ||
1991 | if (rdev->constraints && | |
1992 | (rdev->constraints->valid_ops_mask & | |
1993 | REGULATOR_CHANGE_DRMS)) | |
1994 | drms_uA_update(rdev); | |
1995 | ||
1996 | rdev->use_count--; | |
1997 | } | |
3801b86a | 1998 | |
414c70cb LG |
1999 | return ret; |
2000 | } | |
2001 | ||
2002 | /** | |
2003 | * regulator_disable - disable regulator output | |
2004 | * @regulator: regulator source | |
2005 | * | |
cf7bbcdf MB |
2006 | * Disable the regulator output voltage or current. Calls to |
2007 | * regulator_enable() must be balanced with calls to | |
2008 | * regulator_disable(). | |
69279fb9 | 2009 | * |
414c70cb | 2010 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2011 | * devices have it enabled, the regulator device supports disabling and |
2012 | * machine constraints permit this operation. | |
414c70cb LG |
2013 | */ |
2014 | int regulator_disable(struct regulator *regulator) | |
2015 | { | |
412aec61 DB |
2016 | struct regulator_dev *rdev = regulator->rdev; |
2017 | int ret = 0; | |
414c70cb | 2018 | |
6492bc1b MB |
2019 | if (regulator->always_on) |
2020 | return 0; | |
2021 | ||
412aec61 | 2022 | mutex_lock(&rdev->mutex); |
3801b86a | 2023 | ret = _regulator_disable(rdev); |
412aec61 | 2024 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2025 | |
3801b86a MB |
2026 | if (ret == 0 && rdev->supply) |
2027 | regulator_disable(rdev->supply); | |
8cbf811d | 2028 | |
414c70cb LG |
2029 | return ret; |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2032 | ||
2033 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2034 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2035 | { |
2036 | int ret = 0; | |
2037 | ||
66fda75f MP |
2038 | ret = _regulator_do_disable(rdev); |
2039 | if (ret < 0) { | |
2040 | rdev_err(rdev, "failed to force disable\n"); | |
2041 | return ret; | |
414c70cb LG |
2042 | } |
2043 | ||
66fda75f MP |
2044 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2045 | REGULATOR_EVENT_DISABLE, NULL); | |
2046 | ||
2047 | return 0; | |
414c70cb LG |
2048 | } |
2049 | ||
2050 | /** | |
2051 | * regulator_force_disable - force disable regulator output | |
2052 | * @regulator: regulator source | |
2053 | * | |
2054 | * Forcibly disable the regulator output voltage or current. | |
2055 | * NOTE: this *will* disable the regulator output even if other consumer | |
2056 | * devices have it enabled. This should be used for situations when device | |
2057 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2058 | */ | |
2059 | int regulator_force_disable(struct regulator *regulator) | |
2060 | { | |
82d15839 | 2061 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2062 | int ret; |
2063 | ||
82d15839 | 2064 | mutex_lock(&rdev->mutex); |
414c70cb | 2065 | regulator->uA_load = 0; |
3801b86a | 2066 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2067 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2068 | |
3801b86a MB |
2069 | if (rdev->supply) |
2070 | while (rdev->open_count--) | |
2071 | regulator_disable(rdev->supply); | |
8cbf811d | 2072 | |
414c70cb LG |
2073 | return ret; |
2074 | } | |
2075 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2076 | ||
da07ecd9 MB |
2077 | static void regulator_disable_work(struct work_struct *work) |
2078 | { | |
2079 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2080 | disable_work.work); | |
2081 | int count, i, ret; | |
2082 | ||
2083 | mutex_lock(&rdev->mutex); | |
2084 | ||
2085 | BUG_ON(!rdev->deferred_disables); | |
2086 | ||
2087 | count = rdev->deferred_disables; | |
2088 | rdev->deferred_disables = 0; | |
2089 | ||
2090 | for (i = 0; i < count; i++) { | |
2091 | ret = _regulator_disable(rdev); | |
2092 | if (ret != 0) | |
2093 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2094 | } | |
2095 | ||
2096 | mutex_unlock(&rdev->mutex); | |
2097 | ||
2098 | if (rdev->supply) { | |
2099 | for (i = 0; i < count; i++) { | |
2100 | ret = regulator_disable(rdev->supply); | |
2101 | if (ret != 0) { | |
2102 | rdev_err(rdev, | |
2103 | "Supply disable failed: %d\n", ret); | |
2104 | } | |
2105 | } | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | /** | |
2110 | * regulator_disable_deferred - disable regulator output with delay | |
2111 | * @regulator: regulator source | |
2112 | * @ms: miliseconds until the regulator is disabled | |
2113 | * | |
2114 | * Execute regulator_disable() on the regulator after a delay. This | |
2115 | * is intended for use with devices that require some time to quiesce. | |
2116 | * | |
2117 | * NOTE: this will only disable the regulator output if no other consumer | |
2118 | * devices have it enabled, the regulator device supports disabling and | |
2119 | * machine constraints permit this operation. | |
2120 | */ | |
2121 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2122 | { | |
2123 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 2124 | int ret; |
da07ecd9 | 2125 | |
6492bc1b MB |
2126 | if (regulator->always_on) |
2127 | return 0; | |
2128 | ||
2b5a24a0 MB |
2129 | if (!ms) |
2130 | return regulator_disable(regulator); | |
2131 | ||
da07ecd9 MB |
2132 | mutex_lock(&rdev->mutex); |
2133 | rdev->deferred_disables++; | |
2134 | mutex_unlock(&rdev->mutex); | |
2135 | ||
070260f0 MB |
2136 | ret = queue_delayed_work(system_power_efficient_wq, |
2137 | &rdev->disable_work, | |
2138 | msecs_to_jiffies(ms)); | |
aa59802d MB |
2139 | if (ret < 0) |
2140 | return ret; | |
2141 | else | |
2142 | return 0; | |
da07ecd9 MB |
2143 | } |
2144 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2145 | ||
414c70cb LG |
2146 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2147 | { | |
65f73508 | 2148 | /* A GPIO control always takes precedence */ |
7b74d149 | 2149 | if (rdev->ena_pin) |
65f73508 MB |
2150 | return rdev->ena_gpio_state; |
2151 | ||
9a7f6a4c | 2152 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2153 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2154 | return 1; |
414c70cb | 2155 | |
9332546f | 2156 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2157 | } |
2158 | ||
2159 | /** | |
2160 | * regulator_is_enabled - is the regulator output enabled | |
2161 | * @regulator: regulator source | |
2162 | * | |
412aec61 DB |
2163 | * Returns positive if the regulator driver backing the source/client |
2164 | * has requested that the device be enabled, zero if it hasn't, else a | |
2165 | * negative errno code. | |
2166 | * | |
2167 | * Note that the device backing this regulator handle can have multiple | |
2168 | * users, so it might be enabled even if regulator_enable() was never | |
2169 | * called for this particular source. | |
414c70cb LG |
2170 | */ |
2171 | int regulator_is_enabled(struct regulator *regulator) | |
2172 | { | |
9332546f MB |
2173 | int ret; |
2174 | ||
6492bc1b MB |
2175 | if (regulator->always_on) |
2176 | return 1; | |
2177 | ||
9332546f MB |
2178 | mutex_lock(®ulator->rdev->mutex); |
2179 | ret = _regulator_is_enabled(regulator->rdev); | |
2180 | mutex_unlock(®ulator->rdev->mutex); | |
2181 | ||
2182 | return ret; | |
414c70cb LG |
2183 | } |
2184 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2185 | ||
d1e7de30 MS |
2186 | /** |
2187 | * regulator_can_change_voltage - check if regulator can change voltage | |
2188 | * @regulator: regulator source | |
2189 | * | |
2190 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2191 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2192 | * or dummy regulators and disabling voltage change logic in the client |
2193 | * driver. | |
2194 | */ | |
2195 | int regulator_can_change_voltage(struct regulator *regulator) | |
2196 | { | |
2197 | struct regulator_dev *rdev = regulator->rdev; | |
2198 | ||
2199 | if (rdev->constraints && | |
19280e40 AL |
2200 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2201 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2202 | return 1; | |
2203 | ||
2204 | if (rdev->desc->continuous_voltage_range && | |
2205 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2206 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2207 | return 1; | |
2208 | } | |
d1e7de30 MS |
2209 | |
2210 | return 0; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2213 | ||
4367cfdc DB |
2214 | /** |
2215 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2216 | * @regulator: regulator source | |
2217 | * | |
2218 | * Returns number of selectors, or negative errno. Selectors are | |
2219 | * numbered starting at zero, and typically correspond to bitfields | |
2220 | * in hardware registers. | |
2221 | */ | |
2222 | int regulator_count_voltages(struct regulator *regulator) | |
2223 | { | |
2224 | struct regulator_dev *rdev = regulator->rdev; | |
2225 | ||
26988efe JMC |
2226 | if (rdev->desc->n_voltages) |
2227 | return rdev->desc->n_voltages; | |
2228 | ||
2229 | if (!rdev->supply) | |
2230 | return -EINVAL; | |
2231 | ||
2232 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2233 | } |
2234 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2235 | ||
2236 | /** | |
2237 | * regulator_list_voltage - enumerate supported voltages | |
2238 | * @regulator: regulator source | |
2239 | * @selector: identify voltage to list | |
2240 | * Context: can sleep | |
2241 | * | |
2242 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2243 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2244 | * negative errno. |
2245 | */ | |
2246 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2247 | { | |
272e2315 GX |
2248 | struct regulator_dev *rdev = regulator->rdev; |
2249 | const struct regulator_ops *ops = rdev->desc->ops; | |
2250 | int ret; | |
4367cfdc | 2251 | |
f446043f GL |
2252 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) |
2253 | return rdev->desc->fixed_uV; | |
2254 | ||
26988efe JMC |
2255 | if (ops->list_voltage) { |
2256 | if (selector >= rdev->desc->n_voltages) | |
2257 | return -EINVAL; | |
2258 | mutex_lock(&rdev->mutex); | |
2259 | ret = ops->list_voltage(rdev, selector); | |
2260 | mutex_unlock(&rdev->mutex); | |
2261 | } else if (rdev->supply) { | |
2262 | ret = regulator_list_voltage(rdev->supply, selector); | |
2263 | } else { | |
4367cfdc | 2264 | return -EINVAL; |
26988efe | 2265 | } |
4367cfdc DB |
2266 | |
2267 | if (ret > 0) { | |
2268 | if (ret < rdev->constraints->min_uV) | |
2269 | ret = 0; | |
2270 | else if (ret > rdev->constraints->max_uV) | |
2271 | ret = 0; | |
2272 | } | |
2273 | ||
2274 | return ret; | |
2275 | } | |
2276 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2277 | ||
04eca28c TT |
2278 | /** |
2279 | * regulator_get_regmap - get the regulator's register map | |
2280 | * @regulator: regulator source | |
2281 | * | |
2282 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2283 | * if the regulator doesn't use regmap. | |
2284 | */ | |
2285 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2286 | { | |
2287 | struct regmap *map = regulator->rdev->regmap; | |
2288 | ||
2289 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2290 | } | |
2291 | ||
2292 | /** | |
2293 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2294 | * @regulator: regulator source | |
2295 | * @vsel_reg: voltage selector register, output parameter | |
2296 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2297 | * | |
2298 | * Returns the hardware register offset and bitmask used for setting the | |
2299 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2300 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2301 | * for example. | |
2302 | * | |
2303 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2304 | * and 0 is returned, otherwise a negative errno is returned. | |
2305 | */ | |
2306 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2307 | unsigned *vsel_reg, | |
2308 | unsigned *vsel_mask) | |
2309 | { | |
39f5460d GX |
2310 | struct regulator_dev *rdev = regulator->rdev; |
2311 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2312 | |
2313 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2314 | return -EOPNOTSUPP; | |
2315 | ||
2316 | *vsel_reg = rdev->desc->vsel_reg; | |
2317 | *vsel_mask = rdev->desc->vsel_mask; | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2322 | ||
2323 | /** | |
2324 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2325 | * @regulator: regulator source | |
2326 | * @selector: identify voltage to list | |
2327 | * | |
2328 | * Converts the selector to a hardware-specific voltage selector that can be | |
2329 | * directly written to the regulator registers. The address of the voltage | |
2330 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2331 | * | |
2332 | * On error a negative errno is returned. | |
2333 | */ | |
2334 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2335 | unsigned selector) | |
2336 | { | |
39f5460d GX |
2337 | struct regulator_dev *rdev = regulator->rdev; |
2338 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2339 | |
2340 | if (selector >= rdev->desc->n_voltages) | |
2341 | return -EINVAL; | |
2342 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2343 | return -EOPNOTSUPP; | |
2344 | ||
2345 | return selector; | |
2346 | } | |
2347 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2348 | ||
2a668a8b PW |
2349 | /** |
2350 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2351 | * @regulator: regulator source | |
2352 | * | |
2353 | * Returns the voltage step size between VSEL values for linear | |
2354 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2355 | */ | |
2356 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2357 | { | |
2358 | struct regulator_dev *rdev = regulator->rdev; | |
2359 | ||
2360 | return rdev->desc->uV_step; | |
2361 | } | |
2362 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2363 | ||
a7a1ad90 MB |
2364 | /** |
2365 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2366 | * | |
2367 | * @regulator: Regulator to check. | |
2368 | * @min_uV: Minimum required voltage in uV. | |
2369 | * @max_uV: Maximum required voltage in uV. | |
2370 | * | |
2371 | * Returns a boolean or a negative error code. | |
2372 | */ | |
2373 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2374 | int min_uV, int max_uV) | |
2375 | { | |
c5f3939b | 2376 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2377 | int i, voltages, ret; |
2378 | ||
c5f3939b MB |
2379 | /* If we can't change voltage check the current voltage */ |
2380 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2381 | ret = regulator_get_voltage(regulator); | |
2382 | if (ret >= 0) | |
0d25d09d | 2383 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2384 | else |
2385 | return ret; | |
2386 | } | |
2387 | ||
bd7a2b60 PM |
2388 | /* Any voltage within constrains range is fine? */ |
2389 | if (rdev->desc->continuous_voltage_range) | |
2390 | return min_uV >= rdev->constraints->min_uV && | |
2391 | max_uV <= rdev->constraints->max_uV; | |
2392 | ||
a7a1ad90 MB |
2393 | ret = regulator_count_voltages(regulator); |
2394 | if (ret < 0) | |
2395 | return ret; | |
2396 | voltages = ret; | |
2397 | ||
2398 | for (i = 0; i < voltages; i++) { | |
2399 | ret = regulator_list_voltage(regulator, i); | |
2400 | ||
2401 | if (ret >= min_uV && ret <= max_uV) | |
2402 | return 1; | |
2403 | } | |
2404 | ||
2405 | return 0; | |
2406 | } | |
a398eaa2 | 2407 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2408 | |
7179569a HS |
2409 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2410 | int min_uV, int max_uV, | |
2411 | unsigned *selector) | |
2412 | { | |
2413 | struct pre_voltage_change_data data; | |
2414 | int ret; | |
2415 | ||
2416 | data.old_uV = _regulator_get_voltage(rdev); | |
2417 | data.min_uV = min_uV; | |
2418 | data.max_uV = max_uV; | |
2419 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2420 | &data); | |
2421 | if (ret & NOTIFY_STOP_MASK) | |
2422 | return -EINVAL; | |
2423 | ||
2424 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2425 | if (ret >= 0) | |
2426 | return ret; | |
2427 | ||
2428 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2429 | (void *)data.old_uV); | |
2430 | ||
2431 | return ret; | |
2432 | } | |
2433 | ||
2434 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2435 | int uV, unsigned selector) | |
2436 | { | |
2437 | struct pre_voltage_change_data data; | |
2438 | int ret; | |
2439 | ||
2440 | data.old_uV = _regulator_get_voltage(rdev); | |
2441 | data.min_uV = uV; | |
2442 | data.max_uV = uV; | |
2443 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2444 | &data); | |
2445 | if (ret & NOTIFY_STOP_MASK) | |
2446 | return -EINVAL; | |
2447 | ||
2448 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2449 | if (ret >= 0) | |
2450 | return ret; | |
2451 | ||
2452 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2453 | (void *)data.old_uV); | |
2454 | ||
2455 | return ret; | |
2456 | } | |
2457 | ||
75790251 MB |
2458 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2459 | int min_uV, int max_uV) | |
2460 | { | |
2461 | int ret; | |
77af1b26 | 2462 | int delay = 0; |
e113d792 | 2463 | int best_val = 0; |
75790251 | 2464 | unsigned int selector; |
eba41a5e | 2465 | int old_selector = -1; |
75790251 MB |
2466 | |
2467 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2468 | ||
bf5892a8 MB |
2469 | min_uV += rdev->constraints->uV_offset; |
2470 | max_uV += rdev->constraints->uV_offset; | |
2471 | ||
eba41a5e AL |
2472 | /* |
2473 | * If we can't obtain the old selector there is not enough | |
2474 | * info to call set_voltage_time_sel(). | |
2475 | */ | |
8b7485ef AL |
2476 | if (_regulator_is_enabled(rdev) && |
2477 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2478 | rdev->desc->ops->get_voltage_sel) { |
2479 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2480 | if (old_selector < 0) | |
2481 | return old_selector; | |
2482 | } | |
2483 | ||
75790251 | 2484 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2485 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2486 | &selector); | |
e113d792 MB |
2487 | |
2488 | if (ret >= 0) { | |
2489 | if (rdev->desc->ops->list_voltage) | |
2490 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2491 | selector); | |
2492 | else | |
2493 | best_val = _regulator_get_voltage(rdev); | |
2494 | } | |
2495 | ||
e8eef82b | 2496 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2497 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2498 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2499 | max_uV); | |
9152c36a AL |
2500 | } else { |
2501 | if (rdev->desc->ops->list_voltage == | |
2502 | regulator_list_voltage_linear) | |
2503 | ret = regulator_map_voltage_linear(rdev, | |
2504 | min_uV, max_uV); | |
36698627 AL |
2505 | else if (rdev->desc->ops->list_voltage == |
2506 | regulator_list_voltage_linear_range) | |
2507 | ret = regulator_map_voltage_linear_range(rdev, | |
2508 | min_uV, max_uV); | |
9152c36a AL |
2509 | else |
2510 | ret = regulator_map_voltage_iterate(rdev, | |
2511 | min_uV, max_uV); | |
2512 | } | |
e8eef82b | 2513 | |
e843fc46 | 2514 | if (ret >= 0) { |
e113d792 MB |
2515 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2516 | if (min_uV <= best_val && max_uV >= best_val) { | |
2517 | selector = ret; | |
c66a566a AL |
2518 | if (old_selector == selector) |
2519 | ret = 0; | |
2520 | else | |
7179569a HS |
2521 | ret = _regulator_call_set_voltage_sel( |
2522 | rdev, best_val, selector); | |
e113d792 MB |
2523 | } else { |
2524 | ret = -EINVAL; | |
2525 | } | |
e8eef82b | 2526 | } |
75790251 MB |
2527 | } else { |
2528 | ret = -EINVAL; | |
2529 | } | |
e8eef82b | 2530 | |
eba41a5e | 2531 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2532 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2533 | && old_selector != selector) { | |
77af1b26 | 2534 | |
eba41a5e AL |
2535 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2536 | old_selector, selector); | |
2537 | if (delay < 0) { | |
2538 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2539 | delay); | |
2540 | delay = 0; | |
e8eef82b | 2541 | } |
75790251 | 2542 | |
8b96de31 PR |
2543 | /* Insert any necessary delays */ |
2544 | if (delay >= 1000) { | |
2545 | mdelay(delay / 1000); | |
2546 | udelay(delay % 1000); | |
2547 | } else if (delay) { | |
2548 | udelay(delay); | |
2549 | } | |
77af1b26 LW |
2550 | } |
2551 | ||
2f6c797f AL |
2552 | if (ret == 0 && best_val >= 0) { |
2553 | unsigned long data = best_val; | |
2554 | ||
ded06a52 | 2555 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2556 | (void *)data); |
2557 | } | |
ded06a52 | 2558 | |
eba41a5e | 2559 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2560 | |
2561 | return ret; | |
2562 | } | |
2563 | ||
414c70cb LG |
2564 | /** |
2565 | * regulator_set_voltage - set regulator output voltage | |
2566 | * @regulator: regulator source | |
2567 | * @min_uV: Minimum required voltage in uV | |
2568 | * @max_uV: Maximum acceptable voltage in uV | |
2569 | * | |
2570 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2571 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2572 | * | |
2573 | * If the regulator is enabled then the voltage will change to the new value | |
2574 | * immediately otherwise if the regulator is disabled the regulator will | |
2575 | * output at the new voltage when enabled. | |
2576 | * | |
2577 | * NOTE: If the regulator is shared between several devices then the lowest | |
2578 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2579 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2580 | * calling this function otherwise this call will fail. |
2581 | */ | |
2582 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2583 | { | |
2584 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2585 | int ret = 0; |
92d7a558 | 2586 | int old_min_uV, old_max_uV; |
c00dc359 | 2587 | int current_uV; |
414c70cb LG |
2588 | |
2589 | mutex_lock(&rdev->mutex); | |
2590 | ||
95a3c23a MB |
2591 | /* If we're setting the same range as last time the change |
2592 | * should be a noop (some cpufreq implementations use the same | |
2593 | * voltage for multiple frequencies, for example). | |
2594 | */ | |
2595 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2596 | goto out; | |
2597 | ||
c00dc359 BA |
2598 | /* If we're trying to set a range that overlaps the current voltage, |
2599 | * return succesfully even though the regulator does not support | |
2600 | * changing the voltage. | |
2601 | */ | |
2602 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2603 | current_uV = _regulator_get_voltage(rdev); | |
2604 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2605 | regulator->min_uV = min_uV; | |
2606 | regulator->max_uV = max_uV; | |
2607 | goto out; | |
2608 | } | |
2609 | } | |
2610 | ||
414c70cb | 2611 | /* sanity check */ |
e8eef82b MB |
2612 | if (!rdev->desc->ops->set_voltage && |
2613 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2614 | ret = -EINVAL; |
2615 | goto out; | |
2616 | } | |
2617 | ||
2618 | /* constraints check */ | |
2619 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2620 | if (ret < 0) | |
2621 | goto out; | |
0d25d09d | 2622 | |
92d7a558 PP |
2623 | /* restore original values in case of error */ |
2624 | old_min_uV = regulator->min_uV; | |
2625 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2626 | regulator->min_uV = min_uV; |
2627 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2628 | |
05fda3b1 TP |
2629 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2630 | if (ret < 0) | |
92d7a558 | 2631 | goto out2; |
05fda3b1 | 2632 | |
75790251 | 2633 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2634 | if (ret < 0) |
2635 | goto out2; | |
0d25d09d | 2636 | |
414c70cb LG |
2637 | out: |
2638 | mutex_unlock(&rdev->mutex); | |
2639 | return ret; | |
92d7a558 PP |
2640 | out2: |
2641 | regulator->min_uV = old_min_uV; | |
2642 | regulator->max_uV = old_max_uV; | |
2643 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2644 | return ret; |
2645 | } | |
2646 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2647 | ||
88cd222b LW |
2648 | /** |
2649 | * regulator_set_voltage_time - get raise/fall time | |
2650 | * @regulator: regulator source | |
2651 | * @old_uV: starting voltage in microvolts | |
2652 | * @new_uV: target voltage in microvolts | |
2653 | * | |
2654 | * Provided with the starting and ending voltage, this function attempts to | |
2655 | * calculate the time in microseconds required to rise or fall to this new | |
2656 | * voltage. | |
2657 | */ | |
2658 | int regulator_set_voltage_time(struct regulator *regulator, | |
2659 | int old_uV, int new_uV) | |
2660 | { | |
272e2315 GX |
2661 | struct regulator_dev *rdev = regulator->rdev; |
2662 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
2663 | int old_sel = -1; |
2664 | int new_sel = -1; | |
2665 | int voltage; | |
2666 | int i; | |
2667 | ||
2668 | /* Currently requires operations to do this */ | |
2669 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2670 | || !rdev->desc->n_voltages) | |
2671 | return -EINVAL; | |
2672 | ||
2673 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2674 | /* We only look for exact voltage matches here */ | |
2675 | voltage = regulator_list_voltage(regulator, i); | |
2676 | if (voltage < 0) | |
2677 | return -EINVAL; | |
2678 | if (voltage == 0) | |
2679 | continue; | |
2680 | if (voltage == old_uV) | |
2681 | old_sel = i; | |
2682 | if (voltage == new_uV) | |
2683 | new_sel = i; | |
2684 | } | |
2685 | ||
2686 | if (old_sel < 0 || new_sel < 0) | |
2687 | return -EINVAL; | |
2688 | ||
2689 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2690 | } | |
2691 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2692 | ||
98a175b6 | 2693 | /** |
296c6566 RD |
2694 | * regulator_set_voltage_time_sel - get raise/fall time |
2695 | * @rdev: regulator source device | |
98a175b6 YSB |
2696 | * @old_selector: selector for starting voltage |
2697 | * @new_selector: selector for target voltage | |
2698 | * | |
2699 | * Provided with the starting and target voltage selectors, this function | |
2700 | * returns time in microseconds required to rise or fall to this new voltage | |
2701 | * | |
f11d08c3 | 2702 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2703 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2704 | */ |
2705 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2706 | unsigned int old_selector, | |
2707 | unsigned int new_selector) | |
2708 | { | |
398715ab | 2709 | unsigned int ramp_delay = 0; |
f11d08c3 | 2710 | int old_volt, new_volt; |
398715ab AL |
2711 | |
2712 | if (rdev->constraints->ramp_delay) | |
2713 | ramp_delay = rdev->constraints->ramp_delay; | |
2714 | else if (rdev->desc->ramp_delay) | |
2715 | ramp_delay = rdev->desc->ramp_delay; | |
2716 | ||
2717 | if (ramp_delay == 0) { | |
6f0b2c69 | 2718 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2719 | return 0; |
6f0b2c69 | 2720 | } |
398715ab | 2721 | |
f11d08c3 AL |
2722 | /* sanity check */ |
2723 | if (!rdev->desc->ops->list_voltage) | |
2724 | return -EINVAL; | |
398715ab | 2725 | |
f11d08c3 AL |
2726 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2727 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2728 | ||
2729 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2730 | } |
b19dbf71 | 2731 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2732 | |
606a2562 MB |
2733 | /** |
2734 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2735 | * @regulator: regulator source | |
2736 | * | |
2737 | * Re-apply the last configured voltage. This is intended to be used | |
2738 | * where some external control source the consumer is cooperating with | |
2739 | * has caused the configured voltage to change. | |
2740 | */ | |
2741 | int regulator_sync_voltage(struct regulator *regulator) | |
2742 | { | |
2743 | struct regulator_dev *rdev = regulator->rdev; | |
2744 | int ret, min_uV, max_uV; | |
2745 | ||
2746 | mutex_lock(&rdev->mutex); | |
2747 | ||
2748 | if (!rdev->desc->ops->set_voltage && | |
2749 | !rdev->desc->ops->set_voltage_sel) { | |
2750 | ret = -EINVAL; | |
2751 | goto out; | |
2752 | } | |
2753 | ||
2754 | /* This is only going to work if we've had a voltage configured. */ | |
2755 | if (!regulator->min_uV && !regulator->max_uV) { | |
2756 | ret = -EINVAL; | |
2757 | goto out; | |
2758 | } | |
2759 | ||
2760 | min_uV = regulator->min_uV; | |
2761 | max_uV = regulator->max_uV; | |
2762 | ||
2763 | /* This should be a paranoia check... */ | |
2764 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2765 | if (ret < 0) | |
2766 | goto out; | |
2767 | ||
2768 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2769 | if (ret < 0) | |
2770 | goto out; | |
2771 | ||
2772 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2773 | ||
2774 | out: | |
2775 | mutex_unlock(&rdev->mutex); | |
2776 | return ret; | |
2777 | } | |
2778 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2779 | ||
414c70cb LG |
2780 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2781 | { | |
bf5892a8 | 2782 | int sel, ret; |
476c2d83 MB |
2783 | |
2784 | if (rdev->desc->ops->get_voltage_sel) { | |
2785 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2786 | if (sel < 0) | |
2787 | return sel; | |
bf5892a8 | 2788 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2789 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2790 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2791 | } else if (rdev->desc->ops->list_voltage) { |
2792 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
2793 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
2794 | ret = rdev->desc->fixed_uV; | |
e303996e JMC |
2795 | } else if (rdev->supply) { |
2796 | ret = regulator_get_voltage(rdev->supply); | |
cb220d16 | 2797 | } else { |
414c70cb | 2798 | return -EINVAL; |
cb220d16 | 2799 | } |
bf5892a8 | 2800 | |
cb220d16 AL |
2801 | if (ret < 0) |
2802 | return ret; | |
bf5892a8 | 2803 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2804 | } |
2805 | ||
2806 | /** | |
2807 | * regulator_get_voltage - get regulator output voltage | |
2808 | * @regulator: regulator source | |
2809 | * | |
2810 | * This returns the current regulator voltage in uV. | |
2811 | * | |
2812 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2813 | * function should not be used to determine regulator state. | |
2814 | */ | |
2815 | int regulator_get_voltage(struct regulator *regulator) | |
2816 | { | |
2817 | int ret; | |
2818 | ||
2819 | mutex_lock(®ulator->rdev->mutex); | |
2820 | ||
2821 | ret = _regulator_get_voltage(regulator->rdev); | |
2822 | ||
2823 | mutex_unlock(®ulator->rdev->mutex); | |
2824 | ||
2825 | return ret; | |
2826 | } | |
2827 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2828 | ||
2829 | /** | |
2830 | * regulator_set_current_limit - set regulator output current limit | |
2831 | * @regulator: regulator source | |
ce0d10f8 | 2832 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2833 | * @max_uA: Maximum supported current in uA |
2834 | * | |
2835 | * Sets current sink to the desired output current. This can be set during | |
2836 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2837 | * | |
2838 | * If the regulator is enabled then the current will change to the new value | |
2839 | * immediately otherwise if the regulator is disabled the regulator will | |
2840 | * output at the new current when enabled. | |
2841 | * | |
2842 | * NOTE: Regulator system constraints must be set for this regulator before | |
2843 | * calling this function otherwise this call will fail. | |
2844 | */ | |
2845 | int regulator_set_current_limit(struct regulator *regulator, | |
2846 | int min_uA, int max_uA) | |
2847 | { | |
2848 | struct regulator_dev *rdev = regulator->rdev; | |
2849 | int ret; | |
2850 | ||
2851 | mutex_lock(&rdev->mutex); | |
2852 | ||
2853 | /* sanity check */ | |
2854 | if (!rdev->desc->ops->set_current_limit) { | |
2855 | ret = -EINVAL; | |
2856 | goto out; | |
2857 | } | |
2858 | ||
2859 | /* constraints check */ | |
2860 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2861 | if (ret < 0) | |
2862 | goto out; | |
2863 | ||
2864 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2865 | out: | |
2866 | mutex_unlock(&rdev->mutex); | |
2867 | return ret; | |
2868 | } | |
2869 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2870 | ||
2871 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2872 | { | |
2873 | int ret; | |
2874 | ||
2875 | mutex_lock(&rdev->mutex); | |
2876 | ||
2877 | /* sanity check */ | |
2878 | if (!rdev->desc->ops->get_current_limit) { | |
2879 | ret = -EINVAL; | |
2880 | goto out; | |
2881 | } | |
2882 | ||
2883 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2884 | out: | |
2885 | mutex_unlock(&rdev->mutex); | |
2886 | return ret; | |
2887 | } | |
2888 | ||
2889 | /** | |
2890 | * regulator_get_current_limit - get regulator output current | |
2891 | * @regulator: regulator source | |
2892 | * | |
2893 | * This returns the current supplied by the specified current sink in uA. | |
2894 | * | |
2895 | * NOTE: If the regulator is disabled it will return the current value. This | |
2896 | * function should not be used to determine regulator state. | |
2897 | */ | |
2898 | int regulator_get_current_limit(struct regulator *regulator) | |
2899 | { | |
2900 | return _regulator_get_current_limit(regulator->rdev); | |
2901 | } | |
2902 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2903 | ||
2904 | /** | |
2905 | * regulator_set_mode - set regulator operating mode | |
2906 | * @regulator: regulator source | |
2907 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2908 | * | |
2909 | * Set regulator operating mode to increase regulator efficiency or improve | |
2910 | * regulation performance. | |
2911 | * | |
2912 | * NOTE: Regulator system constraints must be set for this regulator before | |
2913 | * calling this function otherwise this call will fail. | |
2914 | */ | |
2915 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2916 | { | |
2917 | struct regulator_dev *rdev = regulator->rdev; | |
2918 | int ret; | |
500b4ac9 | 2919 | int regulator_curr_mode; |
414c70cb LG |
2920 | |
2921 | mutex_lock(&rdev->mutex); | |
2922 | ||
2923 | /* sanity check */ | |
2924 | if (!rdev->desc->ops->set_mode) { | |
2925 | ret = -EINVAL; | |
2926 | goto out; | |
2927 | } | |
2928 | ||
500b4ac9 SI |
2929 | /* return if the same mode is requested */ |
2930 | if (rdev->desc->ops->get_mode) { | |
2931 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2932 | if (regulator_curr_mode == mode) { | |
2933 | ret = 0; | |
2934 | goto out; | |
2935 | } | |
2936 | } | |
2937 | ||
414c70cb | 2938 | /* constraints check */ |
22c51b47 | 2939 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2940 | if (ret < 0) |
2941 | goto out; | |
2942 | ||
2943 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2944 | out: | |
2945 | mutex_unlock(&rdev->mutex); | |
2946 | return ret; | |
2947 | } | |
2948 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2949 | ||
2950 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2951 | { | |
2952 | int ret; | |
2953 | ||
2954 | mutex_lock(&rdev->mutex); | |
2955 | ||
2956 | /* sanity check */ | |
2957 | if (!rdev->desc->ops->get_mode) { | |
2958 | ret = -EINVAL; | |
2959 | goto out; | |
2960 | } | |
2961 | ||
2962 | ret = rdev->desc->ops->get_mode(rdev); | |
2963 | out: | |
2964 | mutex_unlock(&rdev->mutex); | |
2965 | return ret; | |
2966 | } | |
2967 | ||
2968 | /** | |
2969 | * regulator_get_mode - get regulator operating mode | |
2970 | * @regulator: regulator source | |
2971 | * | |
2972 | * Get the current regulator operating mode. | |
2973 | */ | |
2974 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2975 | { | |
2976 | return _regulator_get_mode(regulator->rdev); | |
2977 | } | |
2978 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2979 | ||
2980 | /** | |
2981 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2982 | * @regulator: regulator source | |
2983 | * @uA_load: load current | |
2984 | * | |
2985 | * Notifies the regulator core of a new device load. This is then used by | |
2986 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2987 | * operating mode for the new regulator loading. | |
2988 | * | |
2989 | * Consumer devices notify their supply regulator of the maximum power | |
2990 | * they will require (can be taken from device datasheet in the power | |
2991 | * consumption tables) when they change operational status and hence power | |
2992 | * state. Examples of operational state changes that can affect power | |
2993 | * consumption are :- | |
2994 | * | |
2995 | * o Device is opened / closed. | |
2996 | * o Device I/O is about to begin or has just finished. | |
2997 | * o Device is idling in between work. | |
2998 | * | |
2999 | * This information is also exported via sysfs to userspace. | |
3000 | * | |
3001 | * DRMS will sum the total requested load on the regulator and change | |
3002 | * to the most efficient operating mode if platform constraints allow. | |
3003 | * | |
3004 | * Returns the new regulator mode or error. | |
3005 | */ | |
3006 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
3007 | { | |
3008 | struct regulator_dev *rdev = regulator->rdev; | |
3009 | struct regulator *consumer; | |
d92d95b6 | 3010 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
414c70cb LG |
3011 | unsigned int mode; |
3012 | ||
d92d95b6 SB |
3013 | if (rdev->supply) |
3014 | input_uV = regulator_get_voltage(rdev->supply); | |
3015 | ||
414c70cb LG |
3016 | mutex_lock(&rdev->mutex); |
3017 | ||
a4b41483 MB |
3018 | /* |
3019 | * first check to see if we can set modes at all, otherwise just | |
3020 | * tell the consumer everything is OK. | |
3021 | */ | |
414c70cb LG |
3022 | regulator->uA_load = uA_load; |
3023 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
3024 | if (ret < 0) { |
3025 | ret = 0; | |
414c70cb | 3026 | goto out; |
a4b41483 | 3027 | } |
414c70cb | 3028 | |
414c70cb LG |
3029 | if (!rdev->desc->ops->get_optimum_mode) |
3030 | goto out; | |
3031 | ||
a4b41483 MB |
3032 | /* |
3033 | * we can actually do this so any errors are indicators of | |
3034 | * potential real failure. | |
3035 | */ | |
3036 | ret = -EINVAL; | |
3037 | ||
854ccbae AL |
3038 | if (!rdev->desc->ops->set_mode) |
3039 | goto out; | |
3040 | ||
414c70cb | 3041 | /* get output voltage */ |
1bf5a1f8 | 3042 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 3043 | if (output_uV <= 0) { |
5da84fd9 | 3044 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
3045 | goto out; |
3046 | } | |
3047 | ||
d92d95b6 | 3048 | /* No supply? Use constraint voltage */ |
1bf5a1f8 | 3049 | if (input_uV <= 0) |
414c70cb LG |
3050 | input_uV = rdev->constraints->input_uV; |
3051 | if (input_uV <= 0) { | |
5da84fd9 | 3052 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
3053 | goto out; |
3054 | } | |
3055 | ||
3056 | /* calc total requested load for this regulator */ | |
3057 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 3058 | total_uA_load += consumer->uA_load; |
414c70cb LG |
3059 | |
3060 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
3061 | input_uV, output_uV, | |
3062 | total_uA_load); | |
2c608234 | 3063 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 3064 | if (ret < 0) { |
5da84fd9 JP |
3065 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
3066 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
3067 | goto out; |
3068 | } | |
3069 | ||
3070 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 3071 | if (ret < 0) { |
5da84fd9 | 3072 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
3073 | goto out; |
3074 | } | |
3075 | ret = mode; | |
3076 | out: | |
3077 | mutex_unlock(&rdev->mutex); | |
3078 | return ret; | |
3079 | } | |
3080 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
3081 | ||
f59c8f9f MB |
3082 | /** |
3083 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3084 | * | |
3085 | * @regulator: Regulator to configure | |
9345dfb8 | 3086 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3087 | * |
3088 | * Allow the regulator to go into bypass mode if all other consumers | |
3089 | * for the regulator also enable bypass mode and the machine | |
3090 | * constraints allow this. Bypass mode means that the regulator is | |
3091 | * simply passing the input directly to the output with no regulation. | |
3092 | */ | |
3093 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3094 | { | |
3095 | struct regulator_dev *rdev = regulator->rdev; | |
3096 | int ret = 0; | |
3097 | ||
3098 | if (!rdev->desc->ops->set_bypass) | |
3099 | return 0; | |
3100 | ||
3101 | if (rdev->constraints && | |
3102 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
3103 | return 0; | |
3104 | ||
3105 | mutex_lock(&rdev->mutex); | |
3106 | ||
3107 | if (enable && !regulator->bypass) { | |
3108 | rdev->bypass_count++; | |
3109 | ||
3110 | if (rdev->bypass_count == rdev->open_count) { | |
3111 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3112 | if (ret != 0) | |
3113 | rdev->bypass_count--; | |
3114 | } | |
3115 | ||
3116 | } else if (!enable && regulator->bypass) { | |
3117 | rdev->bypass_count--; | |
3118 | ||
3119 | if (rdev->bypass_count != rdev->open_count) { | |
3120 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3121 | if (ret != 0) | |
3122 | rdev->bypass_count++; | |
3123 | } | |
3124 | } | |
3125 | ||
3126 | if (ret == 0) | |
3127 | regulator->bypass = enable; | |
3128 | ||
3129 | mutex_unlock(&rdev->mutex); | |
3130 | ||
3131 | return ret; | |
3132 | } | |
3133 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3134 | ||
414c70cb LG |
3135 | /** |
3136 | * regulator_register_notifier - register regulator event notifier | |
3137 | * @regulator: regulator source | |
69279fb9 | 3138 | * @nb: notifier block |
414c70cb LG |
3139 | * |
3140 | * Register notifier block to receive regulator events. | |
3141 | */ | |
3142 | int regulator_register_notifier(struct regulator *regulator, | |
3143 | struct notifier_block *nb) | |
3144 | { | |
3145 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3146 | nb); | |
3147 | } | |
3148 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3149 | ||
3150 | /** | |
3151 | * regulator_unregister_notifier - unregister regulator event notifier | |
3152 | * @regulator: regulator source | |
69279fb9 | 3153 | * @nb: notifier block |
414c70cb LG |
3154 | * |
3155 | * Unregister regulator event notifier block. | |
3156 | */ | |
3157 | int regulator_unregister_notifier(struct regulator *regulator, | |
3158 | struct notifier_block *nb) | |
3159 | { | |
3160 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3161 | nb); | |
3162 | } | |
3163 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3164 | ||
b136fb44 JC |
3165 | /* notify regulator consumers and downstream regulator consumers. |
3166 | * Note mutex must be held by caller. | |
3167 | */ | |
7179569a | 3168 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3169 | unsigned long event, void *data) |
3170 | { | |
414c70cb | 3171 | /* call rdev chain first */ |
7179569a | 3172 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3173 | } |
3174 | ||
3175 | /** | |
3176 | * regulator_bulk_get - get multiple regulator consumers | |
3177 | * | |
3178 | * @dev: Device to supply | |
3179 | * @num_consumers: Number of consumers to register | |
3180 | * @consumers: Configuration of consumers; clients are stored here. | |
3181 | * | |
3182 | * @return 0 on success, an errno on failure. | |
3183 | * | |
3184 | * This helper function allows drivers to get several regulator | |
3185 | * consumers in one operation. If any of the regulators cannot be | |
3186 | * acquired then any regulators that were allocated will be freed | |
3187 | * before returning to the caller. | |
3188 | */ | |
3189 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3190 | struct regulator_bulk_data *consumers) | |
3191 | { | |
3192 | int i; | |
3193 | int ret; | |
3194 | ||
3195 | for (i = 0; i < num_consumers; i++) | |
3196 | consumers[i].consumer = NULL; | |
3197 | ||
3198 | for (i = 0; i < num_consumers; i++) { | |
3199 | consumers[i].consumer = regulator_get(dev, | |
3200 | consumers[i].supply); | |
3201 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 3202 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3203 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3204 | consumers[i].supply, ret); | |
414c70cb LG |
3205 | consumers[i].consumer = NULL; |
3206 | goto err; | |
3207 | } | |
3208 | } | |
3209 | ||
3210 | return 0; | |
3211 | ||
3212 | err: | |
b29c7690 | 3213 | while (--i >= 0) |
414c70cb LG |
3214 | regulator_put(consumers[i].consumer); |
3215 | ||
3216 | return ret; | |
3217 | } | |
3218 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3219 | ||
f21e0e81 MB |
3220 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3221 | { | |
3222 | struct regulator_bulk_data *bulk = data; | |
3223 | ||
3224 | bulk->ret = regulator_enable(bulk->consumer); | |
3225 | } | |
3226 | ||
414c70cb LG |
3227 | /** |
3228 | * regulator_bulk_enable - enable multiple regulator consumers | |
3229 | * | |
3230 | * @num_consumers: Number of consumers | |
3231 | * @consumers: Consumer data; clients are stored here. | |
3232 | * @return 0 on success, an errno on failure | |
3233 | * | |
3234 | * This convenience API allows consumers to enable multiple regulator | |
3235 | * clients in a single API call. If any consumers cannot be enabled | |
3236 | * then any others that were enabled will be disabled again prior to | |
3237 | * return. | |
3238 | */ | |
3239 | int regulator_bulk_enable(int num_consumers, | |
3240 | struct regulator_bulk_data *consumers) | |
3241 | { | |
2955b47d | 3242 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3243 | int i; |
f21e0e81 | 3244 | int ret = 0; |
414c70cb | 3245 | |
6492bc1b MB |
3246 | for (i = 0; i < num_consumers; i++) { |
3247 | if (consumers[i].consumer->always_on) | |
3248 | consumers[i].ret = 0; | |
3249 | else | |
3250 | async_schedule_domain(regulator_bulk_enable_async, | |
3251 | &consumers[i], &async_domain); | |
3252 | } | |
f21e0e81 MB |
3253 | |
3254 | async_synchronize_full_domain(&async_domain); | |
3255 | ||
3256 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3257 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3258 | if (consumers[i].ret != 0) { |
3259 | ret = consumers[i].ret; | |
414c70cb | 3260 | goto err; |
f21e0e81 | 3261 | } |
414c70cb LG |
3262 | } |
3263 | ||
3264 | return 0; | |
3265 | ||
3266 | err: | |
fbe31057 AH |
3267 | for (i = 0; i < num_consumers; i++) { |
3268 | if (consumers[i].ret < 0) | |
3269 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3270 | consumers[i].ret); | |
3271 | else | |
3272 | regulator_disable(consumers[i].consumer); | |
3273 | } | |
414c70cb LG |
3274 | |
3275 | return ret; | |
3276 | } | |
3277 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3278 | ||
3279 | /** | |
3280 | * regulator_bulk_disable - disable multiple regulator consumers | |
3281 | * | |
3282 | * @num_consumers: Number of consumers | |
3283 | * @consumers: Consumer data; clients are stored here. | |
3284 | * @return 0 on success, an errno on failure | |
3285 | * | |
3286 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3287 | * clients in a single API call. If any consumers cannot be disabled |
3288 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3289 | * return. |
3290 | */ | |
3291 | int regulator_bulk_disable(int num_consumers, | |
3292 | struct regulator_bulk_data *consumers) | |
3293 | { | |
3294 | int i; | |
01e86f49 | 3295 | int ret, r; |
414c70cb | 3296 | |
49e22632 | 3297 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3298 | ret = regulator_disable(consumers[i].consumer); |
3299 | if (ret != 0) | |
3300 | goto err; | |
3301 | } | |
3302 | ||
3303 | return 0; | |
3304 | ||
3305 | err: | |
5da84fd9 | 3306 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3307 | for (++i; i < num_consumers; ++i) { |
3308 | r = regulator_enable(consumers[i].consumer); | |
3309 | if (r != 0) | |
3310 | pr_err("Failed to reename %s: %d\n", | |
3311 | consumers[i].supply, r); | |
3312 | } | |
414c70cb LG |
3313 | |
3314 | return ret; | |
3315 | } | |
3316 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3317 | ||
e1de2f42 DK |
3318 | /** |
3319 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3320 | * | |
3321 | * @num_consumers: Number of consumers | |
3322 | * @consumers: Consumer data; clients are stored here. | |
3323 | * @return 0 on success, an errno on failure | |
3324 | * | |
3325 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3326 | * clients in a single API call. | |
3327 | * NOTE: This should be used for situations when device damage will | |
3328 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3329 | * Although regulator_force_disable function call for some consumers can | |
3330 | * return error numbers, the function is called for all consumers. | |
3331 | */ | |
3332 | int regulator_bulk_force_disable(int num_consumers, | |
3333 | struct regulator_bulk_data *consumers) | |
3334 | { | |
3335 | int i; | |
3336 | int ret; | |
3337 | ||
3338 | for (i = 0; i < num_consumers; i++) | |
3339 | consumers[i].ret = | |
3340 | regulator_force_disable(consumers[i].consumer); | |
3341 | ||
3342 | for (i = 0; i < num_consumers; i++) { | |
3343 | if (consumers[i].ret != 0) { | |
3344 | ret = consumers[i].ret; | |
3345 | goto out; | |
3346 | } | |
3347 | } | |
3348 | ||
3349 | return 0; | |
3350 | out: | |
3351 | return ret; | |
3352 | } | |
3353 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3354 | ||
414c70cb LG |
3355 | /** |
3356 | * regulator_bulk_free - free multiple regulator consumers | |
3357 | * | |
3358 | * @num_consumers: Number of consumers | |
3359 | * @consumers: Consumer data; clients are stored here. | |
3360 | * | |
3361 | * This convenience API allows consumers to free multiple regulator | |
3362 | * clients in a single API call. | |
3363 | */ | |
3364 | void regulator_bulk_free(int num_consumers, | |
3365 | struct regulator_bulk_data *consumers) | |
3366 | { | |
3367 | int i; | |
3368 | ||
3369 | for (i = 0; i < num_consumers; i++) { | |
3370 | regulator_put(consumers[i].consumer); | |
3371 | consumers[i].consumer = NULL; | |
3372 | } | |
3373 | } | |
3374 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3375 | ||
3376 | /** | |
3377 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3378 | * @rdev: regulator source |
414c70cb | 3379 | * @event: notifier block |
69279fb9 | 3380 | * @data: callback-specific data. |
414c70cb LG |
3381 | * |
3382 | * Called by regulator drivers to notify clients a regulator event has | |
3383 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3384 | * Note lock must be held by caller. |
414c70cb LG |
3385 | */ |
3386 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3387 | unsigned long event, void *data) | |
3388 | { | |
3389 | _notifier_call_chain(rdev, event, data); | |
3390 | return NOTIFY_DONE; | |
3391 | ||
3392 | } | |
3393 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3394 | ||
be721979 MB |
3395 | /** |
3396 | * regulator_mode_to_status - convert a regulator mode into a status | |
3397 | * | |
3398 | * @mode: Mode to convert | |
3399 | * | |
3400 | * Convert a regulator mode into a status. | |
3401 | */ | |
3402 | int regulator_mode_to_status(unsigned int mode) | |
3403 | { | |
3404 | switch (mode) { | |
3405 | case REGULATOR_MODE_FAST: | |
3406 | return REGULATOR_STATUS_FAST; | |
3407 | case REGULATOR_MODE_NORMAL: | |
3408 | return REGULATOR_STATUS_NORMAL; | |
3409 | case REGULATOR_MODE_IDLE: | |
3410 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3411 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3412 | return REGULATOR_STATUS_STANDBY; |
3413 | default: | |
1beaf762 | 3414 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3415 | } |
3416 | } | |
3417 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3418 | ||
7ad68e2f DB |
3419 | /* |
3420 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3421 | * create attributes that can be meaningfully displayed. | |
3422 | */ | |
3423 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3424 | { | |
272e2315 GX |
3425 | struct device *dev = &rdev->dev; |
3426 | const struct regulator_ops *ops = rdev->desc->ops; | |
3427 | int status = 0; | |
7ad68e2f DB |
3428 | |
3429 | /* some attributes need specific methods to be displayed */ | |
4c78899b | 3430 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
f2889e65 | 3431 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
5a523605 LD |
3432 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || |
3433 | (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { | |
7ad68e2f DB |
3434 | status = device_create_file(dev, &dev_attr_microvolts); |
3435 | if (status < 0) | |
3436 | return status; | |
3437 | } | |
3438 | if (ops->get_current_limit) { | |
3439 | status = device_create_file(dev, &dev_attr_microamps); | |
3440 | if (status < 0) | |
3441 | return status; | |
3442 | } | |
3443 | if (ops->get_mode) { | |
3444 | status = device_create_file(dev, &dev_attr_opmode); | |
3445 | if (status < 0) | |
3446 | return status; | |
3447 | } | |
7b74d149 | 3448 | if (rdev->ena_pin || ops->is_enabled) { |
7ad68e2f DB |
3449 | status = device_create_file(dev, &dev_attr_state); |
3450 | if (status < 0) | |
3451 | return status; | |
3452 | } | |
853116a1 DB |
3453 | if (ops->get_status) { |
3454 | status = device_create_file(dev, &dev_attr_status); | |
3455 | if (status < 0) | |
3456 | return status; | |
3457 | } | |
f59c8f9f MB |
3458 | if (ops->get_bypass) { |
3459 | status = device_create_file(dev, &dev_attr_bypass); | |
3460 | if (status < 0) | |
3461 | return status; | |
3462 | } | |
7ad68e2f DB |
3463 | |
3464 | /* some attributes are type-specific */ | |
3465 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3466 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3467 | if (status < 0) | |
3468 | return status; | |
3469 | } | |
3470 | ||
3471 | /* all the other attributes exist to support constraints; | |
3472 | * don't show them if there are no constraints, or if the | |
3473 | * relevant supporting methods are missing. | |
3474 | */ | |
3475 | if (!rdev->constraints) | |
3476 | return status; | |
3477 | ||
3478 | /* constraints need specific supporting methods */ | |
e8eef82b | 3479 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3480 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3481 | if (status < 0) | |
3482 | return status; | |
3483 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3484 | if (status < 0) | |
3485 | return status; | |
3486 | } | |
3487 | if (ops->set_current_limit) { | |
3488 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3489 | if (status < 0) | |
3490 | return status; | |
3491 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3492 | if (status < 0) | |
3493 | return status; | |
3494 | } | |
3495 | ||
7ad68e2f DB |
3496 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3497 | if (status < 0) | |
3498 | return status; | |
3499 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3500 | if (status < 0) | |
3501 | return status; | |
3502 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3503 | if (status < 0) | |
3504 | return status; | |
3505 | ||
3506 | if (ops->set_suspend_voltage) { | |
3507 | status = device_create_file(dev, | |
3508 | &dev_attr_suspend_standby_microvolts); | |
3509 | if (status < 0) | |
3510 | return status; | |
3511 | status = device_create_file(dev, | |
3512 | &dev_attr_suspend_mem_microvolts); | |
3513 | if (status < 0) | |
3514 | return status; | |
3515 | status = device_create_file(dev, | |
3516 | &dev_attr_suspend_disk_microvolts); | |
3517 | if (status < 0) | |
3518 | return status; | |
3519 | } | |
3520 | ||
3521 | if (ops->set_suspend_mode) { | |
3522 | status = device_create_file(dev, | |
3523 | &dev_attr_suspend_standby_mode); | |
3524 | if (status < 0) | |
3525 | return status; | |
3526 | status = device_create_file(dev, | |
3527 | &dev_attr_suspend_mem_mode); | |
3528 | if (status < 0) | |
3529 | return status; | |
3530 | status = device_create_file(dev, | |
3531 | &dev_attr_suspend_disk_mode); | |
3532 | if (status < 0) | |
3533 | return status; | |
3534 | } | |
3535 | ||
3536 | return status; | |
3537 | } | |
3538 | ||
1130e5b3 MB |
3539 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3540 | { | |
1130e5b3 | 3541 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3542 | if (!rdev->debugfs) { |
1130e5b3 | 3543 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3544 | return; |
3545 | } | |
3546 | ||
3547 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3548 | &rdev->use_count); | |
3549 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3550 | &rdev->open_count); | |
f59c8f9f MB |
3551 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3552 | &rdev->bypass_count); | |
1130e5b3 MB |
3553 | } |
3554 | ||
414c70cb LG |
3555 | /** |
3556 | * regulator_register - register regulator | |
69279fb9 | 3557 | * @regulator_desc: regulator to register |
c172708d | 3558 | * @config: runtime configuration for regulator |
414c70cb LG |
3559 | * |
3560 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3561 | * Returns a valid pointer to struct regulator_dev on success |
3562 | * or an ERR_PTR() on error. | |
414c70cb | 3563 | */ |
65f26846 MB |
3564 | struct regulator_dev * |
3565 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3566 | const struct regulator_config *config) |
414c70cb | 3567 | { |
9a8f5e07 | 3568 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3569 | const struct regulator_init_data *init_data; |
414c70cb LG |
3570 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3571 | struct regulator_dev *rdev; | |
32c8fad4 | 3572 | struct device *dev; |
a5766f11 | 3573 | int ret, i; |
69511a45 | 3574 | const char *supply = NULL; |
414c70cb | 3575 | |
c172708d | 3576 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3577 | return ERR_PTR(-EINVAL); |
3578 | ||
32c8fad4 | 3579 | dev = config->dev; |
dcf70112 | 3580 | WARN_ON(!dev); |
32c8fad4 | 3581 | |
414c70cb LG |
3582 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3583 | return ERR_PTR(-EINVAL); | |
3584 | ||
cd78dfc6 DL |
3585 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3586 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3587 | return ERR_PTR(-EINVAL); |
3588 | ||
476c2d83 MB |
3589 | /* Only one of each should be implemented */ |
3590 | WARN_ON(regulator_desc->ops->get_voltage && | |
3591 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3592 | WARN_ON(regulator_desc->ops->set_voltage && |
3593 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3594 | |
3595 | /* If we're using selectors we must implement list_voltage. */ | |
3596 | if (regulator_desc->ops->get_voltage_sel && | |
3597 | !regulator_desc->ops->list_voltage) { | |
3598 | return ERR_PTR(-EINVAL); | |
3599 | } | |
e8eef82b MB |
3600 | if (regulator_desc->ops->set_voltage_sel && |
3601 | !regulator_desc->ops->list_voltage) { | |
3602 | return ERR_PTR(-EINVAL); | |
3603 | } | |
476c2d83 | 3604 | |
414c70cb LG |
3605 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3606 | if (rdev == NULL) | |
3607 | return ERR_PTR(-ENOMEM); | |
3608 | ||
a0c7b164 MB |
3609 | init_data = regulator_of_get_init_data(dev, regulator_desc, |
3610 | &rdev->dev.of_node); | |
3611 | if (!init_data) { | |
3612 | init_data = config->init_data; | |
3613 | rdev->dev.of_node = of_node_get(config->of_node); | |
3614 | } | |
3615 | ||
414c70cb LG |
3616 | mutex_lock(®ulator_list_mutex); |
3617 | ||
3618 | mutex_init(&rdev->mutex); | |
c172708d | 3619 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3620 | rdev->owner = regulator_desc->owner; |
3621 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3622 | if (config->regmap) |
3623 | rdev->regmap = config->regmap; | |
52b84dac | 3624 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3625 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3626 | else if (dev->parent) |
3627 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3628 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3629 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3630 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3631 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3632 | |
a5766f11 | 3633 | /* preform any regulator specific init */ |
9a8f5e07 | 3634 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3635 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3636 | if (ret < 0) |
3637 | goto clean; | |
a5766f11 LG |
3638 | } |
3639 | ||
a5766f11 | 3640 | /* register with sysfs */ |
414c70cb | 3641 | rdev->dev.class = ®ulator_class; |
a5766f11 | 3642 | rdev->dev.parent = dev; |
812460a9 KS |
3643 | dev_set_name(&rdev->dev, "regulator.%d", |
3644 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3645 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3646 | if (ret != 0) { |
3647 | put_device(&rdev->dev); | |
4fca9545 | 3648 | goto clean; |
ad7725cb | 3649 | } |
a5766f11 LG |
3650 | |
3651 | dev_set_drvdata(&rdev->dev, rdev); | |
3652 | ||
b2a1ef47 | 3653 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
f19b00da | 3654 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3655 | if (ret != 0) { |
3656 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3657 | config->ena_gpio, ret); | |
b2da55d9 | 3658 | goto wash; |
65f73508 MB |
3659 | } |
3660 | ||
65f73508 MB |
3661 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) |
3662 | rdev->ena_gpio_state = 1; | |
3663 | ||
7b74d149 | 3664 | if (config->ena_gpio_invert) |
65f73508 MB |
3665 | rdev->ena_gpio_state = !rdev->ena_gpio_state; |
3666 | } | |
3667 | ||
74f544c1 | 3668 | /* set regulator constraints */ |
9a8f5e07 MB |
3669 | if (init_data) |
3670 | constraints = &init_data->constraints; | |
3671 | ||
3672 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3673 | if (ret < 0) |
3674 | goto scrub; | |
3675 | ||
7ad68e2f DB |
3676 | /* add attributes supported by this regulator */ |
3677 | ret = add_regulator_attributes(rdev); | |
3678 | if (ret < 0) | |
3679 | goto scrub; | |
3680 | ||
9a8f5e07 | 3681 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3682 | supply = init_data->supply_regulator; |
3683 | else if (regulator_desc->supply_name) | |
3684 | supply = regulator_desc->supply_name; | |
3685 | ||
3686 | if (supply) { | |
0178f3e2 | 3687 | struct regulator_dev *r; |
0178f3e2 | 3688 | |
6d191a5f | 3689 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3690 | |
0f7b87f0 AB |
3691 | if (ret == -ENODEV) { |
3692 | /* | |
3693 | * No supply was specified for this regulator and | |
3694 | * there will never be one. | |
3695 | */ | |
3696 | ret = 0; | |
3697 | goto add_dev; | |
3698 | } else if (!r) { | |
69511a45 | 3699 | dev_err(dev, "Failed to find supply %s\n", supply); |
04bf3011 | 3700 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3701 | goto scrub; |
3702 | } | |
3703 | ||
3704 | ret = set_supply(rdev, r); | |
3705 | if (ret < 0) | |
3706 | goto scrub; | |
b2296bd4 LD |
3707 | |
3708 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3709 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3710 | ret = regulator_enable(rdev->supply); |
3711 | if (ret < 0) | |
3712 | goto scrub; | |
3713 | } | |
0178f3e2 MB |
3714 | } |
3715 | ||
0f7b87f0 | 3716 | add_dev: |
a5766f11 | 3717 | /* add consumers devices */ |
9a8f5e07 MB |
3718 | if (init_data) { |
3719 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3720 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3721 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3722 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3723 | if (ret < 0) { |
3724 | dev_err(dev, "Failed to set supply %s\n", | |
3725 | init_data->consumer_supplies[i].supply); | |
3726 | goto unset_supplies; | |
3727 | } | |
23c2f041 | 3728 | } |
414c70cb | 3729 | } |
a5766f11 LG |
3730 | |
3731 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3732 | |
3733 | rdev_init_debugfs(rdev); | |
a5766f11 | 3734 | out: |
414c70cb LG |
3735 | mutex_unlock(®ulator_list_mutex); |
3736 | return rdev; | |
4fca9545 | 3737 | |
d4033b54 JN |
3738 | unset_supplies: |
3739 | unset_regulator_supplies(rdev); | |
3740 | ||
4fca9545 | 3741 | scrub: |
e81dba85 | 3742 | if (rdev->supply) |
23ff2f0f | 3743 | _regulator_put(rdev->supply); |
f19b00da | 3744 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3745 | kfree(rdev->constraints); |
b2da55d9 | 3746 | wash: |
4fca9545 | 3747 | device_unregister(&rdev->dev); |
53032daf PW |
3748 | /* device core frees rdev */ |
3749 | rdev = ERR_PTR(ret); | |
3750 | goto out; | |
3751 | ||
4fca9545 DB |
3752 | clean: |
3753 | kfree(rdev); | |
3754 | rdev = ERR_PTR(ret); | |
3755 | goto out; | |
414c70cb LG |
3756 | } |
3757 | EXPORT_SYMBOL_GPL(regulator_register); | |
3758 | ||
3759 | /** | |
3760 | * regulator_unregister - unregister regulator | |
69279fb9 | 3761 | * @rdev: regulator to unregister |
414c70cb LG |
3762 | * |
3763 | * Called by regulator drivers to unregister a regulator. | |
3764 | */ | |
3765 | void regulator_unregister(struct regulator_dev *rdev) | |
3766 | { | |
3767 | if (rdev == NULL) | |
3768 | return; | |
3769 | ||
891636ea MB |
3770 | if (rdev->supply) { |
3771 | while (rdev->use_count--) | |
3772 | regulator_disable(rdev->supply); | |
e032b376 | 3773 | regulator_put(rdev->supply); |
891636ea | 3774 | } |
414c70cb | 3775 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3776 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3777 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3778 | WARN_ON(rdev->open_count); |
0f1d747b | 3779 | unset_regulator_supplies(rdev); |
414c70cb | 3780 | list_del(&rdev->list); |
f8c12fe3 | 3781 | kfree(rdev->constraints); |
f19b00da | 3782 | regulator_ena_gpio_free(rdev); |
63c7c9e1 | 3783 | of_node_put(rdev->dev.of_node); |
58fb5cf5 | 3784 | device_unregister(&rdev->dev); |
414c70cb LG |
3785 | mutex_unlock(®ulator_list_mutex); |
3786 | } | |
3787 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3788 | ||
414c70cb | 3789 | /** |
cf7bbcdf | 3790 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3791 | * @state: system suspend state |
3792 | * | |
3793 | * Configure each regulator with it's suspend operating parameters for state. | |
3794 | * This will usually be called by machine suspend code prior to supending. | |
3795 | */ | |
3796 | int regulator_suspend_prepare(suspend_state_t state) | |
3797 | { | |
3798 | struct regulator_dev *rdev; | |
3799 | int ret = 0; | |
3800 | ||
3801 | /* ON is handled by regulator active state */ | |
3802 | if (state == PM_SUSPEND_ON) | |
3803 | return -EINVAL; | |
3804 | ||
3805 | mutex_lock(®ulator_list_mutex); | |
3806 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3807 | ||
3808 | mutex_lock(&rdev->mutex); | |
3809 | ret = suspend_prepare(rdev, state); | |
3810 | mutex_unlock(&rdev->mutex); | |
3811 | ||
3812 | if (ret < 0) { | |
5da84fd9 | 3813 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3814 | goto out; |
3815 | } | |
3816 | } | |
3817 | out: | |
3818 | mutex_unlock(®ulator_list_mutex); | |
3819 | return ret; | |
3820 | } | |
3821 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3822 | ||
7a32b589 MH |
3823 | /** |
3824 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3825 | * | |
3826 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3827 | * and that should be turned on according to the regulators properties. | |
3828 | */ | |
3829 | int regulator_suspend_finish(void) | |
3830 | { | |
3831 | struct regulator_dev *rdev; | |
3832 | int ret = 0, error; | |
3833 | ||
3834 | mutex_lock(®ulator_list_mutex); | |
3835 | list_for_each_entry(rdev, ®ulator_list, list) { | |
7a32b589 | 3836 | mutex_lock(&rdev->mutex); |
30c21971 MP |
3837 | if (rdev->use_count > 0 || rdev->constraints->always_on) { |
3838 | error = _regulator_do_enable(rdev); | |
7a32b589 MH |
3839 | if (error) |
3840 | ret = error; | |
3841 | } else { | |
87b28417 | 3842 | if (!have_full_constraints()) |
7a32b589 | 3843 | goto unlock; |
b1a86831 | 3844 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3845 | goto unlock; |
3846 | ||
66fda75f | 3847 | error = _regulator_do_disable(rdev); |
7a32b589 MH |
3848 | if (error) |
3849 | ret = error; | |
3850 | } | |
3851 | unlock: | |
3852 | mutex_unlock(&rdev->mutex); | |
3853 | } | |
3854 | mutex_unlock(®ulator_list_mutex); | |
3855 | return ret; | |
3856 | } | |
3857 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3858 | ||
ca725561 MB |
3859 | /** |
3860 | * regulator_has_full_constraints - the system has fully specified constraints | |
3861 | * | |
3862 | * Calling this function will cause the regulator API to disable all | |
3863 | * regulators which have a zero use count and don't have an always_on | |
3864 | * constraint in a late_initcall. | |
3865 | * | |
3866 | * The intention is that this will become the default behaviour in a | |
3867 | * future kernel release so users are encouraged to use this facility | |
3868 | * now. | |
3869 | */ | |
3870 | void regulator_has_full_constraints(void) | |
3871 | { | |
3872 | has_full_constraints = 1; | |
3873 | } | |
3874 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3875 | ||
414c70cb LG |
3876 | /** |
3877 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3878 | * @rdev: regulator |
414c70cb LG |
3879 | * |
3880 | * Get rdev regulator driver private data. This call can be used in the | |
3881 | * regulator driver context. | |
3882 | */ | |
3883 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3884 | { | |
3885 | return rdev->reg_data; | |
3886 | } | |
3887 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3888 | ||
3889 | /** | |
3890 | * regulator_get_drvdata - get regulator driver data | |
3891 | * @regulator: regulator | |
3892 | * | |
3893 | * Get regulator driver private data. This call can be used in the consumer | |
3894 | * driver context when non API regulator specific functions need to be called. | |
3895 | */ | |
3896 | void *regulator_get_drvdata(struct regulator *regulator) | |
3897 | { | |
3898 | return regulator->rdev->reg_data; | |
3899 | } | |
3900 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3901 | ||
3902 | /** | |
3903 | * regulator_set_drvdata - set regulator driver data | |
3904 | * @regulator: regulator | |
3905 | * @data: data | |
3906 | */ | |
3907 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3908 | { | |
3909 | regulator->rdev->reg_data = data; | |
3910 | } | |
3911 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3912 | ||
3913 | /** | |
3914 | * regulator_get_id - get regulator ID | |
69279fb9 | 3915 | * @rdev: regulator |
414c70cb LG |
3916 | */ |
3917 | int rdev_get_id(struct regulator_dev *rdev) | |
3918 | { | |
3919 | return rdev->desc->id; | |
3920 | } | |
3921 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3922 | ||
a5766f11 LG |
3923 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3924 | { | |
3925 | return &rdev->dev; | |
3926 | } | |
3927 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3928 | ||
3929 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3930 | { | |
3931 | return reg_init_data->driver_data; | |
3932 | } | |
3933 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3934 | ||
ba55a974 MB |
3935 | #ifdef CONFIG_DEBUG_FS |
3936 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3937 | size_t count, loff_t *ppos) | |
3938 | { | |
3939 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3940 | ssize_t len, ret = 0; | |
3941 | struct regulator_map *map; | |
3942 | ||
3943 | if (!buf) | |
3944 | return -ENOMEM; | |
3945 | ||
3946 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3947 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3948 | "%s -> %s.%s\n", | |
3949 | rdev_get_name(map->regulator), map->dev_name, | |
3950 | map->supply); | |
3951 | if (len >= 0) | |
3952 | ret += len; | |
3953 | if (ret > PAGE_SIZE) { | |
3954 | ret = PAGE_SIZE; | |
3955 | break; | |
3956 | } | |
3957 | } | |
3958 | ||
3959 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3960 | ||
3961 | kfree(buf); | |
3962 | ||
3963 | return ret; | |
3964 | } | |
24751434 | 3965 | #endif |
ba55a974 MB |
3966 | |
3967 | static const struct file_operations supply_map_fops = { | |
24751434 | 3968 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3969 | .read = supply_map_read_file, |
3970 | .llseek = default_llseek, | |
ba55a974 | 3971 | #endif |
24751434 | 3972 | }; |
ba55a974 | 3973 | |
414c70cb LG |
3974 | static int __init regulator_init(void) |
3975 | { | |
34abbd68 MB |
3976 | int ret; |
3977 | ||
34abbd68 MB |
3978 | ret = class_register(®ulator_class); |
3979 | ||
1130e5b3 | 3980 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3981 | if (!debugfs_root) |
1130e5b3 | 3982 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3983 | |
f4d562c6 MB |
3984 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3985 | &supply_map_fops); | |
1130e5b3 | 3986 | |
34abbd68 MB |
3987 | regulator_dummy_init(); |
3988 | ||
3989 | return ret; | |
414c70cb LG |
3990 | } |
3991 | ||
3992 | /* init early to allow our consumers to complete system booting */ | |
3993 | core_initcall(regulator_init); | |
ca725561 MB |
3994 | |
3995 | static int __init regulator_init_complete(void) | |
3996 | { | |
3997 | struct regulator_dev *rdev; | |
272e2315 | 3998 | const struct regulator_ops *ops; |
ca725561 MB |
3999 | struct regulation_constraints *c; |
4000 | int enabled, ret; | |
ca725561 | 4001 | |
86f5fcfc MB |
4002 | /* |
4003 | * Since DT doesn't provide an idiomatic mechanism for | |
4004 | * enabling full constraints and since it's much more natural | |
4005 | * with DT to provide them just assume that a DT enabled | |
4006 | * system has full constraints. | |
4007 | */ | |
4008 | if (of_have_populated_dt()) | |
4009 | has_full_constraints = true; | |
4010 | ||
ca725561 MB |
4011 | mutex_lock(®ulator_list_mutex); |
4012 | ||
4013 | /* If we have a full configuration then disable any regulators | |
e9535834 MB |
4014 | * we have permission to change the status for and which are |
4015 | * not in use or always_on. This is effectively the default | |
4016 | * for DT and ACPI as they have full constraints. | |
ca725561 MB |
4017 | */ |
4018 | list_for_each_entry(rdev, ®ulator_list, list) { | |
4019 | ops = rdev->desc->ops; | |
4020 | c = rdev->constraints; | |
4021 | ||
66fda75f | 4022 | if (c && c->always_on) |
ca725561 MB |
4023 | continue; |
4024 | ||
e9535834 MB |
4025 | if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) |
4026 | continue; | |
4027 | ||
ca725561 MB |
4028 | mutex_lock(&rdev->mutex); |
4029 | ||
4030 | if (rdev->use_count) | |
4031 | goto unlock; | |
4032 | ||
4033 | /* If we can't read the status assume it's on. */ | |
4034 | if (ops->is_enabled) | |
4035 | enabled = ops->is_enabled(rdev); | |
4036 | else | |
4037 | enabled = 1; | |
4038 | ||
4039 | if (!enabled) | |
4040 | goto unlock; | |
4041 | ||
87b28417 | 4042 | if (have_full_constraints()) { |
ca725561 MB |
4043 | /* We log since this may kill the system if it |
4044 | * goes wrong. */ | |
5da84fd9 | 4045 | rdev_info(rdev, "disabling\n"); |
66fda75f | 4046 | ret = _regulator_do_disable(rdev); |
0d25d09d | 4047 | if (ret != 0) |
5da84fd9 | 4048 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
4049 | } else { |
4050 | /* The intention is that in future we will | |
4051 | * assume that full constraints are provided | |
4052 | * so warn even if we aren't going to do | |
4053 | * anything here. | |
4054 | */ | |
5da84fd9 | 4055 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
4056 | } |
4057 | ||
4058 | unlock: | |
4059 | mutex_unlock(&rdev->mutex); | |
4060 | } | |
4061 | ||
4062 | mutex_unlock(®ulator_list_mutex); | |
4063 | ||
4064 | return 0; | |
4065 | } | |
fd482a3e | 4066 | late_initcall_sync(regulator_init_complete); |