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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 | ||
9aa50750 WS |
79 | static void regmap_format_2_6_write(struct regmap *map, |
80 | unsigned int reg, unsigned int val) | |
81 | { | |
82 | u8 *out = map->work_buf; | |
83 | ||
84 | *out = (reg << 6) | val; | |
85 | } | |
86 | ||
b83a313b MB |
87 | static void regmap_format_4_12_write(struct regmap *map, |
88 | unsigned int reg, unsigned int val) | |
89 | { | |
90 | __be16 *out = map->work_buf; | |
91 | *out = cpu_to_be16((reg << 12) | val); | |
92 | } | |
93 | ||
94 | static void regmap_format_7_9_write(struct regmap *map, | |
95 | unsigned int reg, unsigned int val) | |
96 | { | |
97 | __be16 *out = map->work_buf; | |
98 | *out = cpu_to_be16((reg << 9) | val); | |
99 | } | |
100 | ||
7e5ec63e LPC |
101 | static void regmap_format_10_14_write(struct regmap *map, |
102 | unsigned int reg, unsigned int val) | |
103 | { | |
104 | u8 *out = map->work_buf; | |
105 | ||
106 | out[2] = val; | |
107 | out[1] = (val >> 8) | (reg << 6); | |
108 | out[0] = reg >> 2; | |
109 | } | |
110 | ||
b83a313b MB |
111 | static void regmap_format_8(void *buf, unsigned int val) |
112 | { | |
113 | u8 *b = buf; | |
114 | ||
115 | b[0] = val; | |
116 | } | |
117 | ||
118 | static void regmap_format_16(void *buf, unsigned int val) | |
119 | { | |
120 | __be16 *b = buf; | |
121 | ||
122 | b[0] = cpu_to_be16(val); | |
123 | } | |
124 | ||
125 | static unsigned int regmap_parse_8(void *buf) | |
126 | { | |
127 | u8 *b = buf; | |
128 | ||
129 | return b[0]; | |
130 | } | |
131 | ||
132 | static unsigned int regmap_parse_16(void *buf) | |
133 | { | |
134 | __be16 *b = buf; | |
135 | ||
136 | b[0] = be16_to_cpu(b[0]); | |
137 | ||
138 | return b[0]; | |
139 | } | |
140 | ||
141 | /** | |
142 | * regmap_init(): Initialise register map | |
143 | * | |
144 | * @dev: Device that will be interacted with | |
145 | * @bus: Bus-specific callbacks to use with device | |
146 | * @config: Configuration for register map | |
147 | * | |
148 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
149 | * a struct regmap. This function should generally not be called | |
150 | * directly, it should be called by bus-specific init functions. | |
151 | */ | |
152 | struct regmap *regmap_init(struct device *dev, | |
153 | const struct regmap_bus *bus, | |
154 | const struct regmap_config *config) | |
155 | { | |
156 | struct regmap *map; | |
157 | int ret = -EINVAL; | |
158 | ||
159 | if (!bus || !config) | |
abbb18fb | 160 | goto err; |
b83a313b MB |
161 | |
162 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
163 | if (map == NULL) { | |
164 | ret = -ENOMEM; | |
165 | goto err; | |
166 | } | |
167 | ||
168 | mutex_init(&map->lock); | |
169 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; | |
c212accc | 170 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 171 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 172 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 173 | map->format.buf_size += map->format.pad_bytes; |
b83a313b MB |
174 | map->dev = dev; |
175 | map->bus = bus; | |
2e2ae66d MB |
176 | map->max_register = config->max_register; |
177 | map->writeable_reg = config->writeable_reg; | |
178 | map->readable_reg = config->readable_reg; | |
179 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 180 | map->precious_reg = config->precious_reg; |
5d1729e7 | 181 | map->cache_type = config->cache_type; |
b83a313b | 182 | |
6f306441 LPC |
183 | if (config->read_flag_mask || config->write_flag_mask) { |
184 | map->read_flag_mask = config->read_flag_mask; | |
185 | map->write_flag_mask = config->write_flag_mask; | |
186 | } else { | |
187 | map->read_flag_mask = bus->read_flag_mask; | |
188 | } | |
189 | ||
b83a313b | 190 | switch (config->reg_bits) { |
9aa50750 WS |
191 | case 2: |
192 | switch (config->val_bits) { | |
193 | case 6: | |
194 | map->format.format_write = regmap_format_2_6_write; | |
195 | break; | |
196 | default: | |
197 | goto err_map; | |
198 | } | |
199 | break; | |
200 | ||
b83a313b MB |
201 | case 4: |
202 | switch (config->val_bits) { | |
203 | case 12: | |
204 | map->format.format_write = regmap_format_4_12_write; | |
205 | break; | |
206 | default: | |
207 | goto err_map; | |
208 | } | |
209 | break; | |
210 | ||
211 | case 7: | |
212 | switch (config->val_bits) { | |
213 | case 9: | |
214 | map->format.format_write = regmap_format_7_9_write; | |
215 | break; | |
216 | default: | |
217 | goto err_map; | |
218 | } | |
219 | break; | |
220 | ||
7e5ec63e LPC |
221 | case 10: |
222 | switch (config->val_bits) { | |
223 | case 14: | |
224 | map->format.format_write = regmap_format_10_14_write; | |
225 | break; | |
226 | default: | |
227 | goto err_map; | |
228 | } | |
229 | break; | |
230 | ||
b83a313b MB |
231 | case 8: |
232 | map->format.format_reg = regmap_format_8; | |
233 | break; | |
234 | ||
235 | case 16: | |
236 | map->format.format_reg = regmap_format_16; | |
237 | break; | |
238 | ||
239 | default: | |
240 | goto err_map; | |
241 | } | |
242 | ||
243 | switch (config->val_bits) { | |
244 | case 8: | |
245 | map->format.format_val = regmap_format_8; | |
246 | map->format.parse_val = regmap_parse_8; | |
247 | break; | |
248 | case 16: | |
249 | map->format.format_val = regmap_format_16; | |
250 | map->format.parse_val = regmap_parse_16; | |
251 | break; | |
252 | } | |
253 | ||
254 | if (!map->format.format_write && | |
255 | !(map->format.format_reg && map->format.format_val)) | |
256 | goto err_map; | |
257 | ||
82159ba8 | 258 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
259 | if (map->work_buf == NULL) { |
260 | ret = -ENOMEM; | |
5204f5e3 | 261 | goto err_map; |
b83a313b MB |
262 | } |
263 | ||
052d2cd1 MB |
264 | regmap_debugfs_init(map); |
265 | ||
e5e3b8ab | 266 | ret = regcache_init(map, config); |
5d1729e7 | 267 | if (ret < 0) |
58072cbf | 268 | goto err_free_workbuf; |
5d1729e7 | 269 | |
b83a313b MB |
270 | return map; |
271 | ||
58072cbf LPC |
272 | err_free_workbuf: |
273 | kfree(map->work_buf); | |
b83a313b MB |
274 | err_map: |
275 | kfree(map); | |
276 | err: | |
277 | return ERR_PTR(ret); | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(regmap_init); | |
280 | ||
bf315173 MB |
281 | /** |
282 | * regmap_reinit_cache(): Reinitialise the current register cache | |
283 | * | |
284 | * @map: Register map to operate on. | |
285 | * @config: New configuration. Only the cache data will be used. | |
286 | * | |
287 | * Discard any existing register cache for the map and initialize a | |
288 | * new cache. This can be used to restore the cache to defaults or to | |
289 | * update the cache configuration to reflect runtime discovery of the | |
290 | * hardware. | |
291 | */ | |
292 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
293 | { | |
294 | int ret; | |
295 | ||
296 | mutex_lock(&map->lock); | |
297 | ||
298 | regcache_exit(map); | |
a24f64a6 | 299 | regmap_debugfs_exit(map); |
bf315173 MB |
300 | |
301 | map->max_register = config->max_register; | |
302 | map->writeable_reg = config->writeable_reg; | |
303 | map->readable_reg = config->readable_reg; | |
304 | map->volatile_reg = config->volatile_reg; | |
305 | map->precious_reg = config->precious_reg; | |
306 | map->cache_type = config->cache_type; | |
307 | ||
a24f64a6 MB |
308 | regmap_debugfs_init(map); |
309 | ||
bf315173 MB |
310 | ret = regcache_init(map, config); |
311 | ||
312 | mutex_unlock(&map->lock); | |
313 | ||
314 | return ret; | |
315 | } | |
316 | ||
b83a313b MB |
317 | /** |
318 | * regmap_exit(): Free a previously allocated register map | |
319 | */ | |
320 | void regmap_exit(struct regmap *map) | |
321 | { | |
5d1729e7 | 322 | regcache_exit(map); |
31244e39 | 323 | regmap_debugfs_exit(map); |
b83a313b | 324 | kfree(map->work_buf); |
b83a313b MB |
325 | kfree(map); |
326 | } | |
327 | EXPORT_SYMBOL_GPL(regmap_exit); | |
328 | ||
329 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, | |
330 | const void *val, size_t val_len) | |
331 | { | |
6f306441 | 332 | u8 *u8 = map->work_buf; |
b83a313b MB |
333 | void *buf; |
334 | int ret = -ENOTSUPP; | |
335 | size_t len; | |
73304781 MB |
336 | int i; |
337 | ||
338 | /* Check for unwritable registers before we start */ | |
339 | if (map->writeable_reg) | |
340 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
341 | if (!map->writeable_reg(map->dev, reg + i)) | |
342 | return -EINVAL; | |
b83a313b MB |
343 | |
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 | */ | |
82159ba8 MB |
355 | if (val == (map->work_buf + map->format.pad_bytes + |
356 | map->format.reg_bytes)) | |
2547e201 | 357 | ret = map->bus->write(map->dev, map->work_buf, |
82159ba8 MB |
358 | map->format.reg_bytes + |
359 | map->format.pad_bytes + | |
360 | val_len); | |
2547e201 | 361 | else if (map->bus->gather_write) |
b83a313b | 362 | ret = map->bus->gather_write(map->dev, map->work_buf, |
82159ba8 MB |
363 | map->format.reg_bytes + |
364 | map->format.pad_bytes, | |
b83a313b MB |
365 | val, val_len); |
366 | ||
2547e201 | 367 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 368 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
369 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
370 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
371 | if (!buf) |
372 | return -ENOMEM; | |
373 | ||
374 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
375 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
376 | val, val_len); | |
b83a313b MB |
377 | ret = map->bus->write(map->dev, buf, len); |
378 | ||
379 | kfree(buf); | |
380 | } | |
381 | ||
fb2736bb MB |
382 | trace_regmap_hw_write_done(map->dev, reg, |
383 | val_len / map->format.val_bytes); | |
384 | ||
b83a313b MB |
385 | return ret; |
386 | } | |
387 | ||
4d2dc095 DP |
388 | int _regmap_write(struct regmap *map, unsigned int reg, |
389 | unsigned int val) | |
b83a313b | 390 | { |
fb2736bb | 391 | int ret; |
b83a313b MB |
392 | BUG_ON(!map->format.format_write && !map->format.format_val); |
393 | ||
5d1729e7 DP |
394 | if (!map->cache_bypass) { |
395 | ret = regcache_write(map, reg, val); | |
396 | if (ret != 0) | |
397 | return ret; | |
8ae0d7e8 MB |
398 | if (map->cache_only) { |
399 | map->cache_dirty = true; | |
5d1729e7 | 400 | return 0; |
8ae0d7e8 | 401 | } |
5d1729e7 DP |
402 | } |
403 | ||
fb2736bb MB |
404 | trace_regmap_reg_write(map->dev, reg, val); |
405 | ||
b83a313b MB |
406 | if (map->format.format_write) { |
407 | map->format.format_write(map, reg, val); | |
408 | ||
fb2736bb MB |
409 | trace_regmap_hw_write_start(map->dev, reg, 1); |
410 | ||
411 | ret = map->bus->write(map->dev, map->work_buf, | |
412 | map->format.buf_size); | |
413 | ||
414 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
415 | ||
416 | return ret; | |
b83a313b | 417 | } else { |
82159ba8 MB |
418 | map->format.format_val(map->work_buf + map->format.reg_bytes |
419 | + map->format.pad_bytes, val); | |
b83a313b | 420 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
421 | map->work_buf + |
422 | map->format.reg_bytes + | |
423 | map->format.pad_bytes, | |
b83a313b MB |
424 | map->format.val_bytes); |
425 | } | |
426 | } | |
427 | ||
428 | /** | |
429 | * regmap_write(): Write a value to a single register | |
430 | * | |
431 | * @map: Register map to write to | |
432 | * @reg: Register to write to | |
433 | * @val: Value to be written | |
434 | * | |
435 | * A value of zero will be returned on success, a negative errno will | |
436 | * be returned in error cases. | |
437 | */ | |
438 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
439 | { | |
440 | int ret; | |
441 | ||
442 | mutex_lock(&map->lock); | |
443 | ||
444 | ret = _regmap_write(map, reg, val); | |
445 | ||
446 | mutex_unlock(&map->lock); | |
447 | ||
448 | return ret; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(regmap_write); | |
451 | ||
452 | /** | |
453 | * regmap_raw_write(): Write raw values to one or more registers | |
454 | * | |
455 | * @map: Register map to write to | |
456 | * @reg: Initial register to write to | |
457 | * @val: Block of data to be written, laid out for direct transmission to the | |
458 | * device | |
459 | * @val_len: Length of data pointed to by val. | |
460 | * | |
461 | * This function is intended to be used for things like firmware | |
462 | * download where a large block of data needs to be transferred to the | |
463 | * device. No formatting will be done on the data provided. | |
464 | * | |
465 | * A value of zero will be returned on success, a negative errno will | |
466 | * be returned in error cases. | |
467 | */ | |
468 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
469 | const void *val, size_t val_len) | |
470 | { | |
c48a9d74 | 471 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b MB |
472 | int ret; |
473 | ||
c48a9d74 LPC |
474 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
475 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 476 | |
b83a313b MB |
477 | mutex_lock(&map->lock); |
478 | ||
479 | ret = _regmap_raw_write(map, reg, val, val_len); | |
480 | ||
481 | mutex_unlock(&map->lock); | |
482 | ||
483 | return ret; | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
486 | ||
487 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
488 | unsigned int val_len) | |
489 | { | |
490 | u8 *u8 = map->work_buf; | |
491 | int ret; | |
492 | ||
493 | map->format.format_reg(map->work_buf, reg); | |
494 | ||
495 | /* | |
6f306441 | 496 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
497 | * register addresss; since it's always the high bits for all |
498 | * current formats we can do this here rather than in | |
499 | * formatting. This may break if we get interesting formats. | |
500 | */ | |
6f306441 | 501 | u8[0] |= map->read_flag_mask; |
b83a313b | 502 | |
fb2736bb MB |
503 | trace_regmap_hw_read_start(map->dev, reg, |
504 | val_len / map->format.val_bytes); | |
505 | ||
82159ba8 MB |
506 | ret = map->bus->read(map->dev, map->work_buf, |
507 | map->format.reg_bytes + map->format.pad_bytes, | |
40c5cc26 | 508 | val, val_len); |
b83a313b | 509 | |
fb2736bb MB |
510 | trace_regmap_hw_read_done(map->dev, reg, |
511 | val_len / map->format.val_bytes); | |
512 | ||
513 | return ret; | |
b83a313b MB |
514 | } |
515 | ||
516 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
517 | unsigned int *val) | |
518 | { | |
519 | int ret; | |
520 | ||
5d1729e7 DP |
521 | if (!map->cache_bypass) { |
522 | ret = regcache_read(map, reg, val); | |
523 | if (ret == 0) | |
524 | return 0; | |
525 | } | |
526 | ||
19254411 LPC |
527 | if (!map->format.parse_val) |
528 | return -EINVAL; | |
529 | ||
5d1729e7 DP |
530 | if (map->cache_only) |
531 | return -EBUSY; | |
532 | ||
b83a313b | 533 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 534 | if (ret == 0) { |
b83a313b | 535 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
536 | trace_regmap_reg_read(map->dev, reg, *val); |
537 | } | |
b83a313b MB |
538 | |
539 | return ret; | |
540 | } | |
541 | ||
542 | /** | |
543 | * regmap_read(): Read a value from a single register | |
544 | * | |
545 | * @map: Register map to write to | |
546 | * @reg: Register to be read from | |
547 | * @val: Pointer to store read value | |
548 | * | |
549 | * A value of zero will be returned on success, a negative errno will | |
550 | * be returned in error cases. | |
551 | */ | |
552 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | mutex_lock(&map->lock); | |
557 | ||
558 | ret = _regmap_read(map, reg, val); | |
559 | ||
560 | mutex_unlock(&map->lock); | |
561 | ||
562 | return ret; | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(regmap_read); | |
565 | ||
566 | /** | |
567 | * regmap_raw_read(): Read raw data from the device | |
568 | * | |
569 | * @map: Register map to write to | |
570 | * @reg: First register to be read from | |
571 | * @val: Pointer to store read value | |
572 | * @val_len: Size of data to read | |
573 | * | |
574 | * A value of zero will be returned on success, a negative errno will | |
575 | * be returned in error cases. | |
576 | */ | |
577 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
578 | size_t val_len) | |
579 | { | |
82cd9965 | 580 | size_t val_count = val_len / map->format.val_bytes; |
b83a313b | 581 | int ret; |
de2d808f | 582 | |
82cd9965 LPC |
583 | WARN_ON(!regmap_volatile_range(map, reg, val_count) && |
584 | map->cache_type != REGCACHE_NONE); | |
04e016ad | 585 | |
b83a313b MB |
586 | mutex_lock(&map->lock); |
587 | ||
588 | ret = _regmap_raw_read(map, reg, val, val_len); | |
589 | ||
590 | mutex_unlock(&map->lock); | |
591 | ||
592 | return ret; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
595 | ||
596 | /** | |
597 | * regmap_bulk_read(): Read multiple registers from the device | |
598 | * | |
599 | * @map: Register map to write to | |
600 | * @reg: First register to be read from | |
601 | * @val: Pointer to store read value, in native register size for device | |
602 | * @val_count: Number of registers to read | |
603 | * | |
604 | * A value of zero will be returned on success, a negative errno will | |
605 | * be returned in error cases. | |
606 | */ | |
607 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
608 | size_t val_count) | |
609 | { | |
610 | int ret, i; | |
611 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 612 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 613 | |
b83a313b MB |
614 | if (!map->format.parse_val) |
615 | return -EINVAL; | |
616 | ||
de2d808f MB |
617 | if (vol || map->cache_type == REGCACHE_NONE) { |
618 | ret = regmap_raw_read(map, reg, val, val_bytes * val_count); | |
619 | if (ret != 0) | |
620 | return ret; | |
621 | ||
622 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
623 | map->format.parse_val(val + i); | |
624 | } else { | |
625 | for (i = 0; i < val_count; i++) { | |
626 | ret = regmap_read(map, reg + i, val + (i * val_bytes)); | |
627 | if (ret != 0) | |
628 | return ret; | |
629 | } | |
630 | } | |
b83a313b MB |
631 | |
632 | return 0; | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
635 | ||
018690d3 MB |
636 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
637 | unsigned int mask, unsigned int val, | |
638 | bool *change) | |
b83a313b MB |
639 | { |
640 | int ret; | |
d91e8db2 | 641 | unsigned int tmp, orig; |
b83a313b MB |
642 | |
643 | mutex_lock(&map->lock); | |
644 | ||
d91e8db2 | 645 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
646 | if (ret != 0) |
647 | goto out; | |
648 | ||
d91e8db2 | 649 | tmp = orig & ~mask; |
b83a313b MB |
650 | tmp |= val & mask; |
651 | ||
018690d3 | 652 | if (tmp != orig) { |
d91e8db2 | 653 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
654 | *change = true; |
655 | } else { | |
656 | *change = false; | |
657 | } | |
b83a313b MB |
658 | |
659 | out: | |
660 | mutex_unlock(&map->lock); | |
661 | ||
662 | return ret; | |
663 | } | |
018690d3 MB |
664 | |
665 | /** | |
666 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
667 | * | |
668 | * @map: Register map to update | |
669 | * @reg: Register to update | |
670 | * @mask: Bitmask to change | |
671 | * @val: New value for bitmask | |
672 | * | |
673 | * Returns zero for success, a negative number on error. | |
674 | */ | |
675 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
676 | unsigned int mask, unsigned int val) | |
677 | { | |
678 | bool change; | |
679 | return _regmap_update_bits(map, reg, mask, val, &change); | |
680 | } | |
b83a313b | 681 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 682 | |
018690d3 MB |
683 | /** |
684 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
685 | * register map and report if updated | |
686 | * | |
687 | * @map: Register map to update | |
688 | * @reg: Register to update | |
689 | * @mask: Bitmask to change | |
690 | * @val: New value for bitmask | |
691 | * @change: Boolean indicating if a write was done | |
692 | * | |
693 | * Returns zero for success, a negative number on error. | |
694 | */ | |
695 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
696 | unsigned int mask, unsigned int val, | |
697 | bool *change) | |
698 | { | |
699 | return _regmap_update_bits(map, reg, mask, val, change); | |
700 | } | |
701 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
702 | ||
31244e39 MB |
703 | static int __init regmap_initcall(void) |
704 | { | |
705 | regmap_debugfs_initcall(); | |
706 | ||
707 | return 0; | |
708 | } | |
709 | postcore_initcall(regmap_initcall); |