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b83a313b MB |
1 | /* |
2 | * Register map access API | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/slab.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/mutex.h> | |
16 | #include <linux/err.h> | |
17 | ||
fb2736bb MB |
18 | #define CREATE_TRACE_POINTS |
19 | #include <trace/events/regmap.h> | |
20 | ||
93de9124 | 21 | #include "internal.h" |
b83a313b | 22 | |
8de2f081 MB |
23 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
24 | { | |
25 | if (map->max_register && reg > map->max_register) | |
26 | return false; | |
27 | ||
28 | if (map->writeable_reg) | |
29 | return map->writeable_reg(map->dev, reg); | |
30 | ||
31 | return true; | |
32 | } | |
33 | ||
34 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
35 | { | |
36 | if (map->max_register && reg > map->max_register) | |
37 | return false; | |
38 | ||
39 | if (map->readable_reg) | |
40 | return map->readable_reg(map->dev, reg); | |
41 | ||
42 | return true; | |
43 | } | |
44 | ||
45 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
46 | { | |
47 | if (map->max_register && reg > map->max_register) | |
48 | return false; | |
49 | ||
50 | if (map->volatile_reg) | |
51 | return map->volatile_reg(map->dev, reg); | |
52 | ||
53 | return true; | |
54 | } | |
55 | ||
56 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
57 | { | |
58 | if (map->max_register && reg > map->max_register) | |
59 | return false; | |
60 | ||
61 | if (map->precious_reg) | |
62 | return map->precious_reg(map->dev, reg); | |
63 | ||
64 | return false; | |
65 | } | |
66 | ||
82cd9965 LPC |
67 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
68 | unsigned int num) | |
69 | { | |
70 | unsigned int i; | |
71 | ||
72 | for (i = 0; i < num; i++) | |
73 | if (!regmap_volatile(map, reg + i)) | |
74 | return false; | |
75 | ||
76 | return true; | |
77 | } | |
78 | ||
b83a313b MB |
79 | static void regmap_format_4_12_write(struct regmap *map, |
80 | unsigned int reg, unsigned int val) | |
81 | { | |
82 | __be16 *out = map->work_buf; | |
83 | *out = cpu_to_be16((reg << 12) | val); | |
84 | } | |
85 | ||
86 | static void regmap_format_7_9_write(struct regmap *map, | |
87 | unsigned int reg, unsigned int val) | |
88 | { | |
89 | __be16 *out = map->work_buf; | |
90 | *out = cpu_to_be16((reg << 9) | val); | |
91 | } | |
92 | ||
7e5ec63e LPC |
93 | static void regmap_format_10_14_write(struct regmap *map, |
94 | unsigned int reg, unsigned int val) | |
95 | { | |
96 | u8 *out = map->work_buf; | |
97 | ||
98 | out[2] = val; | |
99 | out[1] = (val >> 8) | (reg << 6); | |
100 | out[0] = reg >> 2; | |
101 | } | |
102 | ||
b83a313b MB |
103 | static void regmap_format_8(void *buf, unsigned int val) |
104 | { | |
105 | u8 *b = buf; | |
106 | ||
107 | b[0] = val; | |
108 | } | |
109 | ||
110 | static void regmap_format_16(void *buf, unsigned int val) | |
111 | { | |
112 | __be16 *b = buf; | |
113 | ||
114 | b[0] = cpu_to_be16(val); | |
115 | } | |
116 | ||
117 | static unsigned int regmap_parse_8(void *buf) | |
118 | { | |
119 | u8 *b = buf; | |
120 | ||
121 | return b[0]; | |
122 | } | |
123 | ||
124 | static unsigned int regmap_parse_16(void *buf) | |
125 | { | |
126 | __be16 *b = buf; | |
127 | ||
128 | b[0] = be16_to_cpu(b[0]); | |
129 | ||
130 | return b[0]; | |
131 | } | |
132 | ||
133 | /** | |
134 | * regmap_init(): Initialise register map | |
135 | * | |
136 | * @dev: Device that will be interacted with | |
137 | * @bus: Bus-specific callbacks to use with device | |
138 | * @config: Configuration for register map | |
139 | * | |
140 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
141 | * a struct regmap. This function should generally not be called | |
142 | * directly, it should be called by bus-specific init functions. | |
143 | */ | |
144 | struct regmap *regmap_init(struct device *dev, | |
145 | const struct regmap_bus *bus, | |
146 | const struct regmap_config *config) | |
147 | { | |
148 | struct regmap *map; | |
149 | int ret = -EINVAL; | |
150 | ||
151 | if (!bus || !config) | |
abbb18fb | 152 | goto err; |
b83a313b MB |
153 | |
154 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
155 | if (map == NULL) { | |
156 | ret = -ENOMEM; | |
157 | goto err; | |
158 | } | |
159 | ||
160 | mutex_init(&map->lock); | |
161 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
162 | map->format.reg_bytes = config->reg_bits / 8; | |
82159ba8 | 163 | map->format.pad_bytes = config->pad_bits / 8; |
b83a313b | 164 | map->format.val_bytes = config->val_bits / 8; |
82159ba8 | 165 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
166 | map->dev = dev; |
167 | map->bus = bus; | |
2e2ae66d MB |
168 | map->max_register = config->max_register; |
169 | map->writeable_reg = config->writeable_reg; | |
170 | map->readable_reg = config->readable_reg; | |
171 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 172 | map->precious_reg = config->precious_reg; |
5d1729e7 | 173 | map->cache_type = config->cache_type; |
b83a313b | 174 | |
6f306441 LPC |
175 | if (config->read_flag_mask || config->write_flag_mask) { |
176 | map->read_flag_mask = config->read_flag_mask; | |
177 | map->write_flag_mask = config->write_flag_mask; | |
178 | } else { | |
179 | map->read_flag_mask = bus->read_flag_mask; | |
180 | } | |
181 | ||
b83a313b MB |
182 | switch (config->reg_bits) { |
183 | case 4: | |
184 | switch (config->val_bits) { | |
185 | case 12: | |
186 | map->format.format_write = regmap_format_4_12_write; | |
187 | break; | |
188 | default: | |
189 | goto err_map; | |
190 | } | |
191 | break; | |
192 | ||
193 | case 7: | |
194 | switch (config->val_bits) { | |
195 | case 9: | |
196 | map->format.format_write = regmap_format_7_9_write; | |
197 | break; | |
198 | default: | |
199 | goto err_map; | |
200 | } | |
201 | break; | |
202 | ||
7e5ec63e LPC |
203 | case 10: |
204 | switch (config->val_bits) { | |
205 | case 14: | |
206 | map->format.format_write = regmap_format_10_14_write; | |
207 | break; | |
208 | default: | |
209 | goto err_map; | |
210 | } | |
211 | break; | |
212 | ||
b83a313b MB |
213 | case 8: |
214 | map->format.format_reg = regmap_format_8; | |
215 | break; | |
216 | ||
217 | case 16: | |
218 | map->format.format_reg = regmap_format_16; | |
219 | break; | |
220 | ||
221 | default: | |
222 | goto err_map; | |
223 | } | |
224 | ||
225 | switch (config->val_bits) { | |
226 | case 8: | |
227 | map->format.format_val = regmap_format_8; | |
228 | map->format.parse_val = regmap_parse_8; | |
229 | break; | |
230 | case 16: | |
231 | map->format.format_val = regmap_format_16; | |
232 | map->format.parse_val = regmap_parse_16; | |
233 | break; | |
234 | } | |
235 | ||
236 | if (!map->format.format_write && | |
237 | !(map->format.format_reg && map->format.format_val)) | |
238 | goto err_map; | |
239 | ||
82159ba8 | 240 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
241 | if (map->work_buf == NULL) { |
242 | ret = -ENOMEM; | |
5204f5e3 | 243 | goto err_map; |
b83a313b MB |
244 | } |
245 | ||
052d2cd1 MB |
246 | regmap_debugfs_init(map); |
247 | ||
e5e3b8ab | 248 | ret = regcache_init(map, config); |
5d1729e7 | 249 | if (ret < 0) |
58072cbf | 250 | goto err_free_workbuf; |
5d1729e7 | 251 | |
b83a313b MB |
252 | return map; |
253 | ||
58072cbf LPC |
254 | err_free_workbuf: |
255 | kfree(map->work_buf); | |
b83a313b MB |
256 | err_map: |
257 | kfree(map); | |
258 | err: | |
259 | return ERR_PTR(ret); | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(regmap_init); | |
262 | ||
bf315173 MB |
263 | /** |
264 | * regmap_reinit_cache(): Reinitialise the current register cache | |
265 | * | |
266 | * @map: Register map to operate on. | |
267 | * @config: New configuration. Only the cache data will be used. | |
268 | * | |
269 | * Discard any existing register cache for the map and initialize a | |
270 | * new cache. This can be used to restore the cache to defaults or to | |
271 | * update the cache configuration to reflect runtime discovery of the | |
272 | * hardware. | |
273 | */ | |
274 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
275 | { | |
276 | int ret; | |
277 | ||
278 | mutex_lock(&map->lock); | |
279 | ||
280 | regcache_exit(map); | |
a24f64a6 | 281 | regmap_debugfs_exit(map); |
bf315173 MB |
282 | |
283 | map->max_register = config->max_register; | |
284 | map->writeable_reg = config->writeable_reg; | |
285 | map->readable_reg = config->readable_reg; | |
286 | map->volatile_reg = config->volatile_reg; | |
287 | map->precious_reg = config->precious_reg; | |
288 | map->cache_type = config->cache_type; | |
289 | ||
a24f64a6 MB |
290 | regmap_debugfs_init(map); |
291 | ||
bf315173 MB |
292 | ret = regcache_init(map, config); |
293 | ||
294 | mutex_unlock(&map->lock); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
b83a313b MB |
299 | /** |
300 | * regmap_exit(): Free a previously allocated register map | |
301 | */ | |
302 | void regmap_exit(struct regmap *map) | |
303 | { | |
5d1729e7 | 304 | regcache_exit(map); |
31244e39 | 305 | regmap_debugfs_exit(map); |
b83a313b | 306 | kfree(map->work_buf); |
b83a313b MB |
307 | kfree(map); |
308 | } | |
309 | EXPORT_SYMBOL_GPL(regmap_exit); | |
310 | ||
311 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
312 | const void *val, size_t val_len) | |
313 | { | |
6f306441 | 314 | u8 *u8 = map->work_buf; |
b83a313b MB |
315 | void *buf; |
316 | int ret = -ENOTSUPP; | |
317 | size_t len; | |
73304781 MB |
318 | int i; |
319 | ||
320 | /* Check for unwritable registers before we start */ | |
321 | if (map->writeable_reg) | |
322 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
323 | if (!map->writeable_reg(map->dev, reg + i)) | |
324 | return -EINVAL; | |
b83a313b MB |
325 | |
326 | map->format.format_reg(map->work_buf, reg); | |
327 | ||
6f306441 LPC |
328 | u8[0] |= map->write_flag_mask; |
329 | ||
fb2736bb MB |
330 | trace_regmap_hw_write_start(map->dev, reg, |
331 | val_len / map->format.val_bytes); | |
332 | ||
2547e201 MB |
333 | /* If we're doing a single register write we can probably just |
334 | * send the work_buf directly, otherwise try to do a gather | |
335 | * write. | |
336 | */ | |
82159ba8 MB |
337 | if (val == (map->work_buf + map->format.pad_bytes + |
338 | map->format.reg_bytes)) | |
2547e201 | 339 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
340 | map->format.reg_bytes + |
341 | map->format.pad_bytes + | |
342 | val_len); | |
2547e201 | 343 | else if (map->bus->gather_write) |
b83a313b | 344 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
345 | map->format.reg_bytes + |
346 | map->format.pad_bytes, | |
b83a313b MB |
347 | val, val_len); |
348 | ||
2547e201 | 349 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 350 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
351 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
352 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
353 | if (!buf) |
354 | return -ENOMEM; | |
355 | ||
356 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
357 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
358 | val, val_len); | |
b83a313b MB |
359 | ret = map->bus->write(map->dev, buf, len); |
360 | ||
361 | kfree(buf); | |
362 | } | |
363 | ||
fb2736bb MB |
364 | trace_regmap_hw_write_done(map->dev, reg, |
365 | val_len / map->format.val_bytes); | |
366 | ||
b83a313b MB |
367 | return ret; |
368 | } | |
369 | ||
4d2dc095 DP |
370 | int _regmap_write(struct regmap *map, unsigned int reg, |
371 | unsigned int val) | |
b83a313b | 372 | { |
fb2736bb | 373 | int ret; |
b83a313b MB |
374 | BUG_ON(!map->format.format_write && !map->format.format_val); |
375 | ||
5d1729e7 DP |
376 | if (!map->cache_bypass) { |
377 | ret = regcache_write(map, reg, val); | |
378 | if (ret != 0) | |
379 | return ret; | |
8ae0d7e8 MB |
380 | if (map->cache_only) { |
381 | map->cache_dirty = true; | |
5d1729e7 | 382 | return 0; |
8ae0d7e8 | 383 | } |
5d1729e7 DP |
384 | } |
385 | ||
fb2736bb MB |
386 | trace_regmap_reg_write(map->dev, reg, val); |
387 | ||
b83a313b MB |
388 | if (map->format.format_write) { |
389 | map->format.format_write(map, reg, val); | |
390 | ||
fb2736bb MB |
391 | trace_regmap_hw_write_start(map->dev, reg, 1); |
392 | ||
393 | ret = map->bus->write(map->dev, map->work_buf, | |
394 | map->format.buf_size); | |
395 | ||
396 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
397 | ||
398 | return ret; | |
b83a313b | 399 | } else { |
82159ba8 MB |
400 | map->format.format_val(map->work_buf + map->format.reg_bytes |
401 | + map->format.pad_bytes, val); | |
b83a313b | 402 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
403 | map->work_buf + |
404 | map->format.reg_bytes + | |
405 | map->format.pad_bytes, | |
b83a313b MB |
406 | map->format.val_bytes); |
407 | } | |
408 | } | |
409 | ||
410 | /** | |
411 | * regmap_write(): Write a value to a single register | |
412 | * | |
413 | * @map: Register map to write to | |
414 | * @reg: Register to write to | |
415 | * @val: Value to be written | |
416 | * | |
417 | * A value of zero will be returned on success, a negative errno will | |
418 | * be returned in error cases. | |
419 | */ | |
420 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
421 | { | |
422 | int ret; | |
423 | ||
424 | mutex_lock(&map->lock); | |
425 | ||
426 | ret = _regmap_write(map, reg, val); | |
427 | ||
428 | mutex_unlock(&map->lock); | |
429 | ||
430 | return ret; | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(regmap_write); | |
433 | ||
434 | /** | |
435 | * regmap_raw_write(): Write raw values to one or more registers | |
436 | * | |
437 | * @map: Register map to write to | |
438 | * @reg: Initial register to write to | |
439 | * @val: Block of data to be written, laid out for direct transmission to the | |
440 | * device | |
441 | * @val_len: Length of data pointed to by val. | |
442 | * | |
443 | * This function is intended to be used for things like firmware | |
444 | * download where a large block of data needs to be transferred to the | |
445 | * device. No formatting will be done on the data provided. | |
446 | * | |
447 | * A value of zero will be returned on success, a negative errno will | |
448 | * be returned in error cases. | |
449 | */ | |
450 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
451 | const void *val, size_t val_len) | |
452 | { | |
c48a9d74 | 453 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b MB |
454 | int ret; |
455 | ||
c48a9d74 LPC |
456 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
457 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 458 | |
b83a313b MB |
459 | mutex_lock(&map->lock); |
460 | ||
461 | ret = _regmap_raw_write(map, reg, val, val_len); | |
462 | ||
463 | mutex_unlock(&map->lock); | |
464 | ||
465 | return ret; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
468 | ||
469 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
470 | unsigned int val_len) | |
471 | { | |
472 | u8 *u8 = map->work_buf; | |
473 | int ret; | |
474 | ||
475 | map->format.format_reg(map->work_buf, reg); | |
476 | ||
477 | /* | |
6f306441 | 478 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
479 | * register addresss; since it's always the high bits for all |
480 | * current formats we can do this here rather than in | |
481 | * formatting. This may break if we get interesting formats. | |
482 | */ | |
6f306441 | 483 | u8[0] |= map->read_flag_mask; |
b83a313b | 484 | |
fb2736bb MB |
485 | trace_regmap_hw_read_start(map->dev, reg, |
486 | val_len / map->format.val_bytes); | |
487 | ||
82159ba8 MB |
488 | ret = map->bus->read(map->dev, map->work_buf, |
489 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 490 | val, val_len); |
b83a313b | 491 | |
fb2736bb MB |
492 | trace_regmap_hw_read_done(map->dev, reg, |
493 | val_len / map->format.val_bytes); | |
494 | ||
495 | return ret; | |
b83a313b MB |
496 | } |
497 | ||
498 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
499 | unsigned int *val) | |
500 | { | |
501 | int ret; | |
502 | ||
5d1729e7 DP |
503 | if (!map->cache_bypass) { |
504 | ret = regcache_read(map, reg, val); | |
505 | if (ret == 0) | |
506 | return 0; | |
507 | } | |
508 | ||
19254411 LPC |
509 | if (!map->format.parse_val) |
510 | return -EINVAL; | |
511 | ||
5d1729e7 DP |
512 | if (map->cache_only) |
513 | return -EBUSY; | |
514 | ||
b83a313b | 515 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 516 | if (ret == 0) { |
b83a313b | 517 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
518 | trace_regmap_reg_read(map->dev, reg, *val); |
519 | } | |
b83a313b MB |
520 | |
521 | return ret; | |
522 | } | |
523 | ||
524 | /** | |
525 | * regmap_read(): Read a value from a single register | |
526 | * | |
527 | * @map: Register map to write to | |
528 | * @reg: Register to be read from | |
529 | * @val: Pointer to store read value | |
530 | * | |
531 | * A value of zero will be returned on success, a negative errno will | |
532 | * be returned in error cases. | |
533 | */ | |
534 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
535 | { | |
536 | int ret; | |
537 | ||
538 | mutex_lock(&map->lock); | |
539 | ||
540 | ret = _regmap_read(map, reg, val); | |
541 | ||
542 | mutex_unlock(&map->lock); | |
543 | ||
544 | return ret; | |
545 | } | |
546 | EXPORT_SYMBOL_GPL(regmap_read); | |
547 | ||
548 | /** | |
549 | * regmap_raw_read(): Read raw data from the device | |
550 | * | |
551 | * @map: Register map to write to | |
552 | * @reg: First register to be read from | |
553 | * @val: Pointer to store read value | |
554 | * @val_len: Size of data to read | |
555 | * | |
556 | * A value of zero will be returned on success, a negative errno will | |
557 | * be returned in error cases. | |
558 | */ | |
559 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
560 | size_t val_len) | |
561 | { | |
82cd9965 | 562 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b | 563 | int ret; |
de2d808f | 564 | |
82cd9965 LPC |
565 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
566 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 567 | |
b83a313b MB |
568 | mutex_lock(&map->lock); |
569 | ||
570 | ret = _regmap_raw_read(map, reg, val, val_len); | |
571 | ||
572 | mutex_unlock(&map->lock); | |
573 | ||
574 | return ret; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
577 | ||
578 | /** | |
579 | * regmap_bulk_read(): Read multiple registers from the device | |
580 | * | |
581 | * @map: Register map to write to | |
582 | * @reg: First register to be read from | |
583 | * @val: Pointer to store read value, in native register size for device | |
584 | * @val_count: Number of registers to read | |
585 | * | |
586 | * A value of zero will be returned on success, a negative errno will | |
587 | * be returned in error cases. | |
588 | */ | |
589 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
590 | size_t val_count) | |
591 | { | |
592 | int ret, i; | |
593 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 594 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 595 | |
b83a313b MB |
596 | if (!map->format.parse_val) |
597 | return -EINVAL; | |
598 | ||
de2d808f MB |
599 | if (vol || map->cache_type == REGCACHE_NONE) { |
600 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
601 | if (ret != 0) | |
602 | return ret; | |
603 | ||
604 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
605 | map->format.parse_val(val + i); | |
606 | } else { | |
607 | for (i = 0; i < val_count; i++) { | |
608 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
609 | if (ret != 0) | |
610 | return ret; | |
611 | } | |
612 | } | |
b83a313b MB |
613 | |
614 | return 0; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
617 | ||
018690d3 MB |
618 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
619 | unsigned int mask, unsigned int val, | |
620 | bool *change) | |
b83a313b MB |
621 | { |
622 | int ret; | |
d91e8db2 | 623 | unsigned int tmp, orig; |
b83a313b MB |
624 | |
625 | mutex_lock(&map->lock); | |
626 | ||
d91e8db2 | 627 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
628 | if (ret != 0) |
629 | goto out; | |
630 | ||
d91e8db2 | 631 | tmp = orig & ~mask; |
b83a313b MB |
632 | tmp |= val & mask; |
633 | ||
018690d3 | 634 | if (tmp != orig) { |
d91e8db2 | 635 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
636 | *change = true; |
637 | } else { | |
638 | *change = false; | |
639 | } | |
b83a313b MB |
640 | |
641 | out: | |
642 | mutex_unlock(&map->lock); | |
643 | ||
644 | return ret; | |
645 | } | |
018690d3 MB |
646 | |
647 | /** | |
648 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
649 | * | |
650 | * @map: Register map to update | |
651 | * @reg: Register to update | |
652 | * @mask: Bitmask to change | |
653 | * @val: New value for bitmask | |
654 | * | |
655 | * Returns zero for success, a negative number on error. | |
656 | */ | |
657 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
658 | unsigned int mask, unsigned int val) | |
659 | { | |
660 | bool change; | |
661 | return _regmap_update_bits(map, reg, mask, val, &change); | |
662 | } | |
b83a313b | 663 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 664 | |
018690d3 MB |
665 | /** |
666 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
667 | * register map and report if updated | |
668 | * | |
669 | * @map: Register map to update | |
670 | * @reg: Register to update | |
671 | * @mask: Bitmask to change | |
672 | * @val: New value for bitmask | |
673 | * @change: Boolean indicating if a write was done | |
674 | * | |
675 | * Returns zero for success, a negative number on error. | |
676 | */ | |
677 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
678 | unsigned int mask, unsigned int val, | |
679 | bool *change) | |
680 | { | |
681 | return _regmap_update_bits(map, reg, mask, val, change); | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
684 | ||
31244e39 MB |
685 | static int __init regmap_initcall(void) |
686 | { | |
687 | regmap_debugfs_initcall(); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | postcore_initcall(regmap_initcall); |