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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; | |
163 | map->format.val_bytes = config->val_bits / 8; | |
164 | map->dev = dev; | |
165 | map->bus = bus; | |
2e2ae66d MB |
166 | map->max_register = config->max_register; |
167 | map->writeable_reg = config->writeable_reg; | |
168 | map->readable_reg = config->readable_reg; | |
169 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 170 | map->precious_reg = config->precious_reg; |
5d1729e7 | 171 | map->cache_type = config->cache_type; |
b83a313b | 172 | |
6f306441 LPC |
173 | if (config->read_flag_mask || config->write_flag_mask) { |
174 | map->read_flag_mask = config->read_flag_mask; | |
175 | map->write_flag_mask = config->write_flag_mask; | |
176 | } else { | |
177 | map->read_flag_mask = bus->read_flag_mask; | |
178 | } | |
179 | ||
b83a313b MB |
180 | switch (config->reg_bits) { |
181 | case 4: | |
182 | switch (config->val_bits) { | |
183 | case 12: | |
184 | map->format.format_write = regmap_format_4_12_write; | |
185 | break; | |
186 | default: | |
187 | goto err_map; | |
188 | } | |
189 | break; | |
190 | ||
191 | case 7: | |
192 | switch (config->val_bits) { | |
193 | case 9: | |
194 | map->format.format_write = regmap_format_7_9_write; | |
195 | break; | |
196 | default: | |
197 | goto err_map; | |
198 | } | |
199 | break; | |
200 | ||
7e5ec63e LPC |
201 | case 10: |
202 | switch (config->val_bits) { | |
203 | case 14: | |
204 | map->format.format_write = regmap_format_10_14_write; | |
205 | break; | |
206 | default: | |
207 | goto err_map; | |
208 | } | |
209 | break; | |
210 | ||
b83a313b MB |
211 | case 8: |
212 | map->format.format_reg = regmap_format_8; | |
213 | break; | |
214 | ||
215 | case 16: | |
216 | map->format.format_reg = regmap_format_16; | |
217 | break; | |
218 | ||
219 | default: | |
220 | goto err_map; | |
221 | } | |
222 | ||
223 | switch (config->val_bits) { | |
224 | case 8: | |
225 | map->format.format_val = regmap_format_8; | |
226 | map->format.parse_val = regmap_parse_8; | |
227 | break; | |
228 | case 16: | |
229 | map->format.format_val = regmap_format_16; | |
230 | map->format.parse_val = regmap_parse_16; | |
231 | break; | |
232 | } | |
233 | ||
234 | if (!map->format.format_write && | |
235 | !(map->format.format_reg && map->format.format_val)) | |
236 | goto err_map; | |
237 | ||
238 | map->work_buf = kmalloc(map->format.buf_size, GFP_KERNEL); | |
239 | if (map->work_buf == NULL) { | |
240 | ret = -ENOMEM; | |
5204f5e3 | 241 | goto err_map; |
b83a313b MB |
242 | } |
243 | ||
052d2cd1 MB |
244 | regmap_debugfs_init(map); |
245 | ||
e5e3b8ab | 246 | ret = regcache_init(map, config); |
5d1729e7 | 247 | if (ret < 0) |
58072cbf | 248 | goto err_free_workbuf; |
5d1729e7 | 249 | |
b83a313b MB |
250 | return map; |
251 | ||
58072cbf LPC |
252 | err_free_workbuf: |
253 | kfree(map->work_buf); | |
b83a313b MB |
254 | err_map: |
255 | kfree(map); | |
256 | err: | |
257 | return ERR_PTR(ret); | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(regmap_init); | |
260 | ||
bf315173 MB |
261 | /** |
262 | * regmap_reinit_cache(): Reinitialise the current register cache | |
263 | * | |
264 | * @map: Register map to operate on. | |
265 | * @config: New configuration. Only the cache data will be used. | |
266 | * | |
267 | * Discard any existing register cache for the map and initialize a | |
268 | * new cache. This can be used to restore the cache to defaults or to | |
269 | * update the cache configuration to reflect runtime discovery of the | |
270 | * hardware. | |
271 | */ | |
272 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
273 | { | |
274 | int ret; | |
275 | ||
276 | mutex_lock(&map->lock); | |
277 | ||
278 | regcache_exit(map); | |
279 | ||
280 | map->max_register = config->max_register; | |
281 | map->writeable_reg = config->writeable_reg; | |
282 | map->readable_reg = config->readable_reg; | |
283 | map->volatile_reg = config->volatile_reg; | |
284 | map->precious_reg = config->precious_reg; | |
285 | map->cache_type = config->cache_type; | |
286 | ||
421e8d2d MB |
287 | map->cache_bypass = false; |
288 | map->cache_only = false; | |
289 | ||
bf315173 MB |
290 | ret = regcache_init(map, config); |
291 | ||
292 | mutex_unlock(&map->lock); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
b83a313b MB |
297 | /** |
298 | * regmap_exit(): Free a previously allocated register map | |
299 | */ | |
300 | void regmap_exit(struct regmap *map) | |
301 | { | |
5d1729e7 | 302 | regcache_exit(map); |
31244e39 | 303 | regmap_debugfs_exit(map); |
b83a313b | 304 | kfree(map->work_buf); |
b83a313b MB |
305 | kfree(map); |
306 | } | |
307 | EXPORT_SYMBOL_GPL(regmap_exit); | |
308 | ||
309 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
310 | const void *val, size_t val_len) | |
311 | { | |
6f306441 | 312 | u8 *u8 = map->work_buf; |
b83a313b MB |
313 | void *buf; |
314 | int ret = -ENOTSUPP; | |
315 | size_t len; | |
73304781 MB |
316 | int i; |
317 | ||
318 | /* Check for unwritable registers before we start */ | |
319 | if (map->writeable_reg) | |
320 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
321 | if (!map->writeable_reg(map->dev, reg + i)) | |
322 | return -EINVAL; | |
b83a313b | 323 | |
c9157198 LD |
324 | if (!map->cache_bypass && map->format.parse_val) { |
325 | unsigned int ival; | |
326 | int val_bytes = map->format.val_bytes; | |
327 | for (i = 0; i < val_len / val_bytes; i++) { | |
328 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
329 | ival = map->format.parse_val(map->work_buf); | |
330 | ret = regcache_write(map, reg + i, ival); | |
331 | if (ret) { | |
332 | dev_err(map->dev, | |
333 | "Error in caching of register: %u ret: %d\n", | |
334 | reg + i, ret); | |
335 | return ret; | |
336 | } | |
337 | } | |
338 | if (map->cache_only) { | |
339 | map->cache_dirty = true; | |
340 | return 0; | |
341 | } | |
342 | } | |
343 | ||
b83a313b MB |
344 | map->format.format_reg(map->work_buf, reg); |
345 | ||
6f306441 LPC |
346 | u8[0] |= map->write_flag_mask; |
347 | ||
fb2736bb MB |
348 | trace_regmap_hw_write_start(map->dev, reg, |
349 | val_len / map->format.val_bytes); | |
350 | ||
2547e201 MB |
351 | /* If we're doing a single register write we can probably just |
352 | * send the work_buf directly, otherwise try to do a gather | |
353 | * write. | |
354 | */ | |
355 | if (val == map->work_buf + map->format.reg_bytes) | |
356 | ret = map->bus->write(map->dev, map->work_buf, | |
357 | map->format.reg_bytes + val_len); | |
358 | else if (map->bus->gather_write) | |
b83a313b MB |
359 | ret = map->bus->gather_write(map->dev, map->work_buf, |
360 | map->format.reg_bytes, | |
361 | val, val_len); | |
362 | ||
2547e201 | 363 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b MB |
364 | if (ret == -ENOTSUPP) { |
365 | len = map->format.reg_bytes + val_len; | |
366 | buf = kmalloc(len, GFP_KERNEL); | |
367 | if (!buf) | |
368 | return -ENOMEM; | |
369 | ||
370 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
371 | memcpy(buf + map->format.reg_bytes, val, val_len); | |
372 | ret = map->bus->write(map->dev, buf, len); | |
373 | ||
374 | kfree(buf); | |
375 | } | |
376 | ||
fb2736bb MB |
377 | trace_regmap_hw_write_done(map->dev, reg, |
378 | val_len / map->format.val_bytes); | |
379 | ||
b83a313b MB |
380 | return ret; |
381 | } | |
382 | ||
4d2dc095 DP |
383 | int _regmap_write(struct regmap *map, unsigned int reg, |
384 | unsigned int val) | |
b83a313b | 385 | { |
fb2736bb | 386 | int ret; |
b83a313b MB |
387 | BUG_ON(!map->format.format_write && !map->format.format_val); |
388 | ||
c9157198 | 389 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
390 | ret = regcache_write(map, reg, val); |
391 | if (ret != 0) | |
392 | return ret; | |
8ae0d7e8 MB |
393 | if (map->cache_only) { |
394 | map->cache_dirty = true; | |
5d1729e7 | 395 | return 0; |
8ae0d7e8 | 396 | } |
5d1729e7 DP |
397 | } |
398 | ||
fb2736bb MB |
399 | trace_regmap_reg_write(map->dev, reg, val); |
400 | ||
b83a313b MB |
401 | if (map->format.format_write) { |
402 | map->format.format_write(map, reg, val); | |
403 | ||
fb2736bb MB |
404 | trace_regmap_hw_write_start(map->dev, reg, 1); |
405 | ||
406 | ret = map->bus->write(map->dev, map->work_buf, | |
407 | map->format.buf_size); | |
408 | ||
409 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
410 | ||
411 | return ret; | |
b83a313b MB |
412 | } else { |
413 | map->format.format_val(map->work_buf + map->format.reg_bytes, | |
414 | val); | |
415 | return _regmap_raw_write(map, reg, | |
416 | map->work_buf + map->format.reg_bytes, | |
417 | map->format.val_bytes); | |
418 | } | |
419 | } | |
420 | ||
421 | /** | |
422 | * regmap_write(): Write a value to a single register | |
423 | * | |
424 | * @map: Register map to write to | |
425 | * @reg: Register to write to | |
426 | * @val: Value to be written | |
427 | * | |
428 | * A value of zero will be returned on success, a negative errno will | |
429 | * be returned in error cases. | |
430 | */ | |
431 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
432 | { | |
433 | int ret; | |
434 | ||
435 | mutex_lock(&map->lock); | |
436 | ||
437 | ret = _regmap_write(map, reg, val); | |
438 | ||
439 | mutex_unlock(&map->lock); | |
440 | ||
441 | return ret; | |
442 | } | |
443 | EXPORT_SYMBOL_GPL(regmap_write); | |
444 | ||
445 | /** | |
446 | * regmap_raw_write(): Write raw values to one or more registers | |
447 | * | |
448 | * @map: Register map to write to | |
449 | * @reg: Initial register to write to | |
450 | * @val: Block of data to be written, laid out for direct transmission to the | |
451 | * device | |
452 | * @val_len: Length of data pointed to by val. | |
453 | * | |
454 | * This function is intended to be used for things like firmware | |
455 | * download where a large block of data needs to be transferred to the | |
456 | * device. No formatting will be done on the data provided. | |
457 | * | |
458 | * A value of zero will be returned on success, a negative errno will | |
459 | * be returned in error cases. | |
460 | */ | |
461 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
462 | const void *val, size_t val_len) | |
463 | { | |
464 | int ret; | |
465 | ||
466 | mutex_lock(&map->lock); | |
467 | ||
468 | ret = _regmap_raw_write(map, reg, val, val_len); | |
469 | ||
470 | mutex_unlock(&map->lock); | |
471 | ||
472 | return ret; | |
473 | } | |
474 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
475 | ||
476 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
477 | unsigned int val_len) | |
478 | { | |
479 | u8 *u8 = map->work_buf; | |
480 | int ret; | |
481 | ||
482 | map->format.format_reg(map->work_buf, reg); | |
483 | ||
484 | /* | |
6f306441 | 485 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
486 | * register addresss; since it's always the high bits for all |
487 | * current formats we can do this here rather than in | |
488 | * formatting. This may break if we get interesting formats. | |
489 | */ | |
6f306441 | 490 | u8[0] |= map->read_flag_mask; |
b83a313b | 491 | |
fb2736bb MB |
492 | trace_regmap_hw_read_start(map->dev, reg, |
493 | val_len / map->format.val_bytes); | |
494 | ||
b83a313b | 495 | ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes, |
40c5cc26 | 496 | val, val_len); |
b83a313b | 497 | |
fb2736bb MB |
498 | trace_regmap_hw_read_done(map->dev, reg, |
499 | val_len / map->format.val_bytes); | |
500 | ||
501 | return ret; | |
b83a313b MB |
502 | } |
503 | ||
504 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
505 | unsigned int *val) | |
506 | { | |
507 | int ret; | |
508 | ||
5d1729e7 DP |
509 | if (!map->cache_bypass) { |
510 | ret = regcache_read(map, reg, val); | |
511 | if (ret == 0) | |
512 | return 0; | |
513 | } | |
514 | ||
19254411 LPC |
515 | if (!map->format.parse_val) |
516 | return -EINVAL; | |
517 | ||
5d1729e7 DP |
518 | if (map->cache_only) |
519 | return -EBUSY; | |
520 | ||
b83a313b | 521 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 522 | if (ret == 0) { |
b83a313b | 523 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
524 | trace_regmap_reg_read(map->dev, reg, *val); |
525 | } | |
b83a313b MB |
526 | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /** | |
531 | * regmap_read(): Read a value from a single register | |
532 | * | |
533 | * @map: Register map to write to | |
534 | * @reg: Register to be read from | |
535 | * @val: Pointer to store read value | |
536 | * | |
537 | * A value of zero will be returned on success, a negative errno will | |
538 | * be returned in error cases. | |
539 | */ | |
540 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
541 | { | |
542 | int ret; | |
543 | ||
544 | mutex_lock(&map->lock); | |
545 | ||
546 | ret = _regmap_read(map, reg, val); | |
547 | ||
548 | mutex_unlock(&map->lock); | |
549 | ||
550 | return ret; | |
551 | } | |
552 | EXPORT_SYMBOL_GPL(regmap_read); | |
553 | ||
554 | /** | |
555 | * regmap_raw_read(): Read raw data from the device | |
556 | * | |
557 | * @map: Register map to write to | |
558 | * @reg: First register to be read from | |
559 | * @val: Pointer to store read value | |
560 | * @val_len: Size of data to read | |
561 | * | |
562 | * A value of zero will be returned on success, a negative errno will | |
563 | * be returned in error cases. | |
564 | */ | |
565 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
566 | size_t val_len) | |
567 | { | |
82cd9965 | 568 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b | 569 | int ret; |
de2d808f | 570 | |
82cd9965 LPC |
571 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
572 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 573 | |
b83a313b MB |
574 | mutex_lock(&map->lock); |
575 | ||
576 | ret = _regmap_raw_read(map, reg, val, val_len); | |
577 | ||
578 | mutex_unlock(&map->lock); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
583 | ||
584 | /** | |
585 | * regmap_bulk_read(): Read multiple registers from the device | |
586 | * | |
587 | * @map: Register map to write to | |
588 | * @reg: First register to be read from | |
589 | * @val: Pointer to store read value, in native register size for device | |
590 | * @val_count: Number of registers to read | |
591 | * | |
592 | * A value of zero will be returned on success, a negative errno will | |
593 | * be returned in error cases. | |
594 | */ | |
595 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
596 | size_t val_count) | |
597 | { | |
598 | int ret, i; | |
599 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 600 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 601 | |
b83a313b MB |
602 | if (!map->format.parse_val) |
603 | return -EINVAL; | |
604 | ||
de2d808f MB |
605 | if (vol || map->cache_type == REGCACHE_NONE) { |
606 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
607 | if (ret != 0) | |
608 | return ret; | |
609 | ||
610 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
611 | map->format.parse_val(val + i); | |
612 | } else { | |
613 | for (i = 0; i < val_count; i++) { | |
614 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
615 | if (ret != 0) | |
616 | return ret; | |
617 | } | |
618 | } | |
b83a313b MB |
619 | |
620 | return 0; | |
621 | } | |
622 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
623 | ||
018690d3 MB |
624 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
625 | unsigned int mask, unsigned int val, | |
626 | bool *change) | |
b83a313b MB |
627 | { |
628 | int ret; | |
d91e8db2 | 629 | unsigned int tmp, orig; |
b83a313b MB |
630 | |
631 | mutex_lock(&map->lock); | |
632 | ||
d91e8db2 | 633 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
634 | if (ret != 0) |
635 | goto out; | |
636 | ||
d91e8db2 | 637 | tmp = orig & ~mask; |
b83a313b MB |
638 | tmp |= val & mask; |
639 | ||
018690d3 | 640 | if (tmp != orig) { |
d91e8db2 | 641 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
642 | *change = true; |
643 | } else { | |
644 | *change = false; | |
645 | } | |
b83a313b MB |
646 | |
647 | out: | |
648 | mutex_unlock(&map->lock); | |
649 | ||
650 | return ret; | |
651 | } | |
018690d3 MB |
652 | |
653 | /** | |
654 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
655 | * | |
656 | * @map: Register map to update | |
657 | * @reg: Register to update | |
658 | * @mask: Bitmask to change | |
659 | * @val: New value for bitmask | |
660 | * | |
661 | * Returns zero for success, a negative number on error. | |
662 | */ | |
663 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
664 | unsigned int mask, unsigned int val) | |
665 | { | |
666 | bool change; | |
667 | return _regmap_update_bits(map, reg, mask, val, &change); | |
668 | } | |
b83a313b | 669 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 670 | |
018690d3 MB |
671 | /** |
672 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
673 | * register map and report if updated | |
674 | * | |
675 | * @map: Register map to update | |
676 | * @reg: Register to update | |
677 | * @mask: Bitmask to change | |
678 | * @val: New value for bitmask | |
679 | * @change: Boolean indicating if a write was done | |
680 | * | |
681 | * Returns zero for success, a negative number on error. | |
682 | */ | |
683 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
684 | unsigned int mask, unsigned int val, | |
685 | bool *change) | |
686 | { | |
687 | return _regmap_update_bits(map, reg, mask, val, change); | |
688 | } | |
689 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
690 | ||
31244e39 MB |
691 | static int __init regmap_initcall(void) |
692 | { | |
693 | regmap_debugfs_initcall(); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | postcore_initcall(regmap_initcall); |