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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 MB |
323 | |
324 | map->format.format_reg(map->work_buf, reg); | |
325 | ||
6f306441 LPC |
326 | u8[0] |= map->write_flag_mask; |
327 | ||
fb2736bb MB |
328 | trace_regmap_hw_write_start(map->dev, reg, |
329 | val_len / map->format.val_bytes); | |
330 | ||
2547e201 MB |
331 | /* If we're doing a single register write we can probably just |
332 | * send the work_buf directly, otherwise try to do a gather | |
333 | * write. | |
334 | */ | |
335 | if (val == map->work_buf + map->format.reg_bytes) | |
336 | ret = map->bus->write(map->dev, map->work_buf, | |
337 | map->format.reg_bytes + val_len); | |
338 | else if (map->bus->gather_write) | |
b83a313b MB |
339 | ret = map->bus->gather_write(map->dev, map->work_buf, |
340 | map->format.reg_bytes, | |
341 | val, val_len); | |
342 | ||
2547e201 | 343 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b MB |
344 | if (ret == -ENOTSUPP) { |
345 | len = map->format.reg_bytes + val_len; | |
346 | buf = kmalloc(len, GFP_KERNEL); | |
347 | if (!buf) | |
348 | return -ENOMEM; | |
349 | ||
350 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
351 | memcpy(buf + map->format.reg_bytes, val, val_len); | |
352 | ret = map->bus->write(map->dev, buf, len); | |
353 | ||
354 | kfree(buf); | |
355 | } | |
356 | ||
fb2736bb MB |
357 | trace_regmap_hw_write_done(map->dev, reg, |
358 | val_len / map->format.val_bytes); | |
359 | ||
b83a313b MB |
360 | return ret; |
361 | } | |
362 | ||
4d2dc095 DP |
363 | int _regmap_write(struct regmap *map, unsigned int reg, |
364 | unsigned int val) | |
b83a313b | 365 | { |
fb2736bb | 366 | int ret; |
b83a313b MB |
367 | BUG_ON(!map->format.format_write && !map->format.format_val); |
368 | ||
5d1729e7 DP |
369 | if (!map->cache_bypass) { |
370 | ret = regcache_write(map, reg, val); | |
371 | if (ret != 0) | |
372 | return ret; | |
8ae0d7e8 MB |
373 | if (map->cache_only) { |
374 | map->cache_dirty = true; | |
5d1729e7 | 375 | return 0; |
8ae0d7e8 | 376 | } |
5d1729e7 DP |
377 | } |
378 | ||
fb2736bb MB |
379 | trace_regmap_reg_write(map->dev, reg, val); |
380 | ||
b83a313b MB |
381 | if (map->format.format_write) { |
382 | map->format.format_write(map, reg, val); | |
383 | ||
fb2736bb MB |
384 | trace_regmap_hw_write_start(map->dev, reg, 1); |
385 | ||
386 | ret = map->bus->write(map->dev, map->work_buf, | |
387 | map->format.buf_size); | |
388 | ||
389 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
390 | ||
391 | return ret; | |
b83a313b MB |
392 | } else { |
393 | map->format.format_val(map->work_buf + map->format.reg_bytes, | |
394 | val); | |
395 | return _regmap_raw_write(map, reg, | |
396 | map->work_buf + map->format.reg_bytes, | |
397 | map->format.val_bytes); | |
398 | } | |
399 | } | |
400 | ||
401 | /** | |
402 | * regmap_write(): Write a value to a single register | |
403 | * | |
404 | * @map: Register map to write to | |
405 | * @reg: Register to write to | |
406 | * @val: Value to be written | |
407 | * | |
408 | * A value of zero will be returned on success, a negative errno will | |
409 | * be returned in error cases. | |
410 | */ | |
411 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
412 | { | |
413 | int ret; | |
414 | ||
415 | mutex_lock(&map->lock); | |
416 | ||
417 | ret = _regmap_write(map, reg, val); | |
418 | ||
419 | mutex_unlock(&map->lock); | |
420 | ||
421 | return ret; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(regmap_write); | |
424 | ||
425 | /** | |
426 | * regmap_raw_write(): Write raw values to one or more registers | |
427 | * | |
428 | * @map: Register map to write to | |
429 | * @reg: Initial register to write to | |
430 | * @val: Block of data to be written, laid out for direct transmission to the | |
431 | * device | |
432 | * @val_len: Length of data pointed to by val. | |
433 | * | |
434 | * This function is intended to be used for things like firmware | |
435 | * download where a large block of data needs to be transferred to the | |
436 | * device. No formatting will be done on the data provided. | |
437 | * | |
438 | * A value of zero will be returned on success, a negative errno will | |
439 | * be returned in error cases. | |
440 | */ | |
441 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
442 | const void *val, size_t val_len) | |
443 | { | |
c48a9d74 | 444 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b MB |
445 | int ret; |
446 | ||
c48a9d74 LPC |
447 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
448 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 449 | |
b83a313b MB |
450 | mutex_lock(&map->lock); |
451 | ||
452 | ret = _regmap_raw_write(map, reg, val, val_len); | |
453 | ||
454 | mutex_unlock(&map->lock); | |
455 | ||
456 | return ret; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
459 | ||
460 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
461 | unsigned int val_len) | |
462 | { | |
463 | u8 *u8 = map->work_buf; | |
464 | int ret; | |
465 | ||
466 | map->format.format_reg(map->work_buf, reg); | |
467 | ||
468 | /* | |
6f306441 | 469 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
470 | * register addresss; since it's always the high bits for all |
471 | * current formats we can do this here rather than in | |
472 | * formatting. This may break if we get interesting formats. | |
473 | */ | |
6f306441 | 474 | u8[0] |= map->read_flag_mask; |
b83a313b | 475 | |
fb2736bb MB |
476 | trace_regmap_hw_read_start(map->dev, reg, |
477 | val_len / map->format.val_bytes); | |
478 | ||
b83a313b | 479 | ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes, |
40c5cc26 | 480 | val, val_len); |
b83a313b | 481 | |
fb2736bb MB |
482 | trace_regmap_hw_read_done(map->dev, reg, |
483 | val_len / map->format.val_bytes); | |
484 | ||
485 | return ret; | |
b83a313b MB |
486 | } |
487 | ||
488 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
489 | unsigned int *val) | |
490 | { | |
491 | int ret; | |
492 | ||
5d1729e7 DP |
493 | if (!map->cache_bypass) { |
494 | ret = regcache_read(map, reg, val); | |
495 | if (ret == 0) | |
496 | return 0; | |
497 | } | |
498 | ||
19254411 LPC |
499 | if (!map->format.parse_val) |
500 | return -EINVAL; | |
501 | ||
5d1729e7 DP |
502 | if (map->cache_only) |
503 | return -EBUSY; | |
504 | ||
b83a313b | 505 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 506 | if (ret == 0) { |
b83a313b | 507 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
508 | trace_regmap_reg_read(map->dev, reg, *val); |
509 | } | |
b83a313b MB |
510 | |
511 | return ret; | |
512 | } | |
513 | ||
514 | /** | |
515 | * regmap_read(): Read a value from a single register | |
516 | * | |
517 | * @map: Register map to write to | |
518 | * @reg: Register to be read from | |
519 | * @val: Pointer to store read value | |
520 | * | |
521 | * A value of zero will be returned on success, a negative errno will | |
522 | * be returned in error cases. | |
523 | */ | |
524 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
525 | { | |
526 | int ret; | |
527 | ||
528 | mutex_lock(&map->lock); | |
529 | ||
530 | ret = _regmap_read(map, reg, val); | |
531 | ||
532 | mutex_unlock(&map->lock); | |
533 | ||
534 | return ret; | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(regmap_read); | |
537 | ||
538 | /** | |
539 | * regmap_raw_read(): Read raw data from the device | |
540 | * | |
541 | * @map: Register map to write to | |
542 | * @reg: First register to be read from | |
543 | * @val: Pointer to store read value | |
544 | * @val_len: Size of data to read | |
545 | * | |
546 | * A value of zero will be returned on success, a negative errno will | |
547 | * be returned in error cases. | |
548 | */ | |
549 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
550 | size_t val_len) | |
551 | { | |
82cd9965 | 552 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b | 553 | int ret; |
de2d808f | 554 | |
82cd9965 LPC |
555 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
556 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 557 | |
b83a313b MB |
558 | mutex_lock(&map->lock); |
559 | ||
560 | ret = _regmap_raw_read(map, reg, val, val_len); | |
561 | ||
562 | mutex_unlock(&map->lock); | |
563 | ||
564 | return ret; | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
567 | ||
568 | /** | |
569 | * regmap_bulk_read(): Read multiple registers from the device | |
570 | * | |
571 | * @map: Register map to write to | |
572 | * @reg: First register to be read from | |
573 | * @val: Pointer to store read value, in native register size for device | |
574 | * @val_count: Number of registers to read | |
575 | * | |
576 | * A value of zero will be returned on success, a negative errno will | |
577 | * be returned in error cases. | |
578 | */ | |
579 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
580 | size_t val_count) | |
581 | { | |
582 | int ret, i; | |
583 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 584 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 585 | |
b83a313b MB |
586 | if (!map->format.parse_val) |
587 | return -EINVAL; | |
588 | ||
de2d808f MB |
589 | if (vol || map->cache_type == REGCACHE_NONE) { |
590 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
591 | if (ret != 0) | |
592 | return ret; | |
593 | ||
594 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
595 | map->format.parse_val(val + i); | |
596 | } else { | |
597 | for (i = 0; i < val_count; i++) { | |
598 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
599 | if (ret != 0) | |
600 | return ret; | |
601 | } | |
602 | } | |
b83a313b MB |
603 | |
604 | return 0; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
607 | ||
018690d3 MB |
608 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
609 | unsigned int mask, unsigned int val, | |
610 | bool *change) | |
b83a313b MB |
611 | { |
612 | int ret; | |
d91e8db2 | 613 | unsigned int tmp, orig; |
b83a313b MB |
614 | |
615 | mutex_lock(&map->lock); | |
616 | ||
d91e8db2 | 617 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
618 | if (ret != 0) |
619 | goto out; | |
620 | ||
d91e8db2 | 621 | tmp = orig & ~mask; |
b83a313b MB |
622 | tmp |= val & mask; |
623 | ||
018690d3 | 624 | if (tmp != orig) { |
d91e8db2 | 625 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
626 | *change = true; |
627 | } else { | |
628 | *change = false; | |
629 | } | |
b83a313b MB |
630 | |
631 | out: | |
632 | mutex_unlock(&map->lock); | |
633 | ||
634 | return ret; | |
635 | } | |
018690d3 MB |
636 | |
637 | /** | |
638 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
639 | * | |
640 | * @map: Register map to update | |
641 | * @reg: Register to update | |
642 | * @mask: Bitmask to change | |
643 | * @val: New value for bitmask | |
644 | * | |
645 | * Returns zero for success, a negative number on error. | |
646 | */ | |
647 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
648 | unsigned int mask, unsigned int val) | |
649 | { | |
650 | bool change; | |
651 | return _regmap_update_bits(map, reg, mask, val, &change); | |
652 | } | |
b83a313b | 653 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 654 | |
018690d3 MB |
655 | /** |
656 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
657 | * register map and report if updated | |
658 | * | |
659 | * @map: Register map to update | |
660 | * @reg: Register to update | |
661 | * @mask: Bitmask to change | |
662 | * @val: New value for bitmask | |
663 | * @change: Boolean indicating if a write was done | |
664 | * | |
665 | * Returns zero for success, a negative number on error. | |
666 | */ | |
667 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
668 | unsigned int mask, unsigned int val, | |
669 | bool *change) | |
670 | { | |
671 | return _regmap_update_bits(map, reg, mask, val, change); | |
672 | } | |
673 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
674 | ||
a6539c32 MB |
675 | /** |
676 | * regmap_get_val_bytes(): Report the size of a register value | |
677 | * | |
678 | * Report the size of a register value, mainly intended to for use by | |
679 | * generic infrastructure built on top of regmap. | |
680 | */ | |
681 | int regmap_get_val_bytes(struct regmap *map) | |
682 | { | |
683 | if (map->format.format_write) | |
684 | return -EINVAL; | |
685 | ||
686 | return map->format.val_bytes; | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
689 | ||
31244e39 MB |
690 | static int __init regmap_initcall(void) |
691 | { | |
692 | regmap_debugfs_initcall(); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | postcore_initcall(regmap_initcall); |