Commit | Line | Data |
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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 | ||
f5d6eba7 | 13 | #include <linux/device.h> |
b83a313b | 14 | #include <linux/slab.h> |
19694b5e | 15 | #include <linux/export.h> |
b83a313b MB |
16 | #include <linux/mutex.h> |
17 | #include <linux/err.h> | |
18 | ||
fb2736bb MB |
19 | #define CREATE_TRACE_POINTS |
20 | #include <trace/events/regmap.h> | |
21 | ||
93de9124 | 22 | #include "internal.h" |
b83a313b | 23 | |
8de2f081 MB |
24 | bool regmap_writeable(struct regmap *map, unsigned int reg) |
25 | { | |
26 | if (map->max_register && reg > map->max_register) | |
27 | return false; | |
28 | ||
29 | if (map->writeable_reg) | |
30 | return map->writeable_reg(map->dev, reg); | |
31 | ||
32 | return true; | |
33 | } | |
34 | ||
35 | bool regmap_readable(struct regmap *map, unsigned int reg) | |
36 | { | |
37 | if (map->max_register && reg > map->max_register) | |
38 | return false; | |
39 | ||
4191f197 WS |
40 | if (map->format.format_write) |
41 | return false; | |
42 | ||
8de2f081 MB |
43 | if (map->readable_reg) |
44 | return map->readable_reg(map->dev, reg); | |
45 | ||
46 | return true; | |
47 | } | |
48 | ||
49 | bool regmap_volatile(struct regmap *map, unsigned int reg) | |
50 | { | |
4191f197 | 51 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
52 | return false; |
53 | ||
54 | if (map->volatile_reg) | |
55 | return map->volatile_reg(map->dev, reg); | |
56 | ||
57 | return true; | |
58 | } | |
59 | ||
60 | bool regmap_precious(struct regmap *map, unsigned int reg) | |
61 | { | |
4191f197 | 62 | if (!regmap_readable(map, reg)) |
8de2f081 MB |
63 | return false; |
64 | ||
65 | if (map->precious_reg) | |
66 | return map->precious_reg(map->dev, reg); | |
67 | ||
68 | return false; | |
69 | } | |
70 | ||
82cd9965 LPC |
71 | static bool regmap_volatile_range(struct regmap *map, unsigned int reg, |
72 | unsigned int num) | |
73 | { | |
74 | unsigned int i; | |
75 | ||
76 | for (i = 0; i < num; i++) | |
77 | if (!regmap_volatile(map, reg + i)) | |
78 | return false; | |
79 | ||
80 | return true; | |
81 | } | |
82 | ||
9aa50750 WS |
83 | static void regmap_format_2_6_write(struct regmap *map, |
84 | unsigned int reg, unsigned int val) | |
85 | { | |
86 | u8 *out = map->work_buf; | |
87 | ||
88 | *out = (reg << 6) | val; | |
89 | } | |
90 | ||
b83a313b MB |
91 | static void regmap_format_4_12_write(struct regmap *map, |
92 | unsigned int reg, unsigned int val) | |
93 | { | |
94 | __be16 *out = map->work_buf; | |
95 | *out = cpu_to_be16((reg << 12) | val); | |
96 | } | |
97 | ||
98 | static void regmap_format_7_9_write(struct regmap *map, | |
99 | unsigned int reg, unsigned int val) | |
100 | { | |
101 | __be16 *out = map->work_buf; | |
102 | *out = cpu_to_be16((reg << 9) | val); | |
103 | } | |
104 | ||
7e5ec63e LPC |
105 | static void regmap_format_10_14_write(struct regmap *map, |
106 | unsigned int reg, unsigned int val) | |
107 | { | |
108 | u8 *out = map->work_buf; | |
109 | ||
110 | out[2] = val; | |
111 | out[1] = (val >> 8) | (reg << 6); | |
112 | out[0] = reg >> 2; | |
113 | } | |
114 | ||
d939fb9a | 115 | static void regmap_format_8(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
116 | { |
117 | u8 *b = buf; | |
118 | ||
d939fb9a | 119 | b[0] = val << shift; |
b83a313b MB |
120 | } |
121 | ||
141eba2e | 122 | static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift) |
b83a313b MB |
123 | { |
124 | __be16 *b = buf; | |
125 | ||
d939fb9a | 126 | b[0] = cpu_to_be16(val << shift); |
b83a313b MB |
127 | } |
128 | ||
141eba2e SW |
129 | static void regmap_format_16_native(void *buf, unsigned int val, |
130 | unsigned int shift) | |
131 | { | |
132 | *(u16 *)buf = val << shift; | |
133 | } | |
134 | ||
d939fb9a | 135 | static void regmap_format_24(void *buf, unsigned int val, unsigned int shift) |
ea279fc5 MR |
136 | { |
137 | u8 *b = buf; | |
138 | ||
d939fb9a MR |
139 | val <<= shift; |
140 | ||
ea279fc5 MR |
141 | b[0] = val >> 16; |
142 | b[1] = val >> 8; | |
143 | b[2] = val; | |
144 | } | |
145 | ||
141eba2e | 146 | static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift) |
7d5e525b MB |
147 | { |
148 | __be32 *b = buf; | |
149 | ||
d939fb9a | 150 | b[0] = cpu_to_be32(val << shift); |
7d5e525b MB |
151 | } |
152 | ||
141eba2e SW |
153 | static void regmap_format_32_native(void *buf, unsigned int val, |
154 | unsigned int shift) | |
155 | { | |
156 | *(u32 *)buf = val << shift; | |
157 | } | |
158 | ||
b83a313b MB |
159 | static unsigned int regmap_parse_8(void *buf) |
160 | { | |
161 | u8 *b = buf; | |
162 | ||
163 | return b[0]; | |
164 | } | |
165 | ||
141eba2e | 166 | static unsigned int regmap_parse_16_be(void *buf) |
b83a313b MB |
167 | { |
168 | __be16 *b = buf; | |
169 | ||
170 | b[0] = be16_to_cpu(b[0]); | |
171 | ||
172 | return b[0]; | |
173 | } | |
174 | ||
141eba2e SW |
175 | static unsigned int regmap_parse_16_native(void *buf) |
176 | { | |
177 | return *(u16 *)buf; | |
178 | } | |
179 | ||
ea279fc5 MR |
180 | static unsigned int regmap_parse_24(void *buf) |
181 | { | |
182 | u8 *b = buf; | |
183 | unsigned int ret = b[2]; | |
184 | ret |= ((unsigned int)b[1]) << 8; | |
185 | ret |= ((unsigned int)b[0]) << 16; | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
141eba2e | 190 | static unsigned int regmap_parse_32_be(void *buf) |
7d5e525b MB |
191 | { |
192 | __be32 *b = buf; | |
193 | ||
194 | b[0] = be32_to_cpu(b[0]); | |
195 | ||
196 | return b[0]; | |
197 | } | |
198 | ||
141eba2e SW |
199 | static unsigned int regmap_parse_32_native(void *buf) |
200 | { | |
201 | return *(u32 *)buf; | |
202 | } | |
203 | ||
bacdbe07 SW |
204 | static void regmap_lock_mutex(struct regmap *map) |
205 | { | |
206 | mutex_lock(&map->mutex); | |
207 | } | |
208 | ||
209 | static void regmap_unlock_mutex(struct regmap *map) | |
210 | { | |
211 | mutex_unlock(&map->mutex); | |
212 | } | |
213 | ||
214 | static void regmap_lock_spinlock(struct regmap *map) | |
215 | { | |
216 | spin_lock(&map->spinlock); | |
217 | } | |
218 | ||
219 | static void regmap_unlock_spinlock(struct regmap *map) | |
220 | { | |
221 | spin_unlock(&map->spinlock); | |
222 | } | |
223 | ||
72b39f6f MB |
224 | static void dev_get_regmap_release(struct device *dev, void *res) |
225 | { | |
226 | /* | |
227 | * We don't actually have anything to do here; the goal here | |
228 | * is not to manage the regmap but to provide a simple way to | |
229 | * get the regmap back given a struct device. | |
230 | */ | |
231 | } | |
232 | ||
b83a313b MB |
233 | /** |
234 | * regmap_init(): Initialise register map | |
235 | * | |
236 | * @dev: Device that will be interacted with | |
237 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 238 | * @bus_context: Data passed to bus-specific callbacks |
b83a313b MB |
239 | * @config: Configuration for register map |
240 | * | |
241 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
242 | * a struct regmap. This function should generally not be called | |
243 | * directly, it should be called by bus-specific init functions. | |
244 | */ | |
245 | struct regmap *regmap_init(struct device *dev, | |
246 | const struct regmap_bus *bus, | |
0135bbcc | 247 | void *bus_context, |
b83a313b MB |
248 | const struct regmap_config *config) |
249 | { | |
72b39f6f | 250 | struct regmap *map, **m; |
b83a313b | 251 | int ret = -EINVAL; |
141eba2e | 252 | enum regmap_endian reg_endian, val_endian; |
b83a313b MB |
253 | |
254 | if (!bus || !config) | |
abbb18fb | 255 | goto err; |
b83a313b MB |
256 | |
257 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
258 | if (map == NULL) { | |
259 | ret = -ENOMEM; | |
260 | goto err; | |
261 | } | |
262 | ||
bacdbe07 SW |
263 | if (bus->fast_io) { |
264 | spin_lock_init(&map->spinlock); | |
265 | map->lock = regmap_lock_spinlock; | |
266 | map->unlock = regmap_unlock_spinlock; | |
267 | } else { | |
268 | mutex_init(&map->mutex); | |
269 | map->lock = regmap_lock_mutex; | |
270 | map->unlock = regmap_unlock_mutex; | |
271 | } | |
b83a313b | 272 | map->format.buf_size = (config->reg_bits + config->val_bits) / 8; |
c212accc | 273 | map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); |
82159ba8 | 274 | map->format.pad_bytes = config->pad_bits / 8; |
c212accc | 275 | map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); |
82159ba8 | 276 | map->format.buf_size += map->format.pad_bytes; |
d939fb9a | 277 | map->reg_shift = config->pad_bits % 8; |
f01ee60f SW |
278 | if (config->reg_stride) |
279 | map->reg_stride = config->reg_stride; | |
280 | else | |
281 | map->reg_stride = 1; | |
2e33caf1 | 282 | map->use_single_rw = config->use_single_rw; |
b83a313b MB |
283 | map->dev = dev; |
284 | map->bus = bus; | |
0135bbcc | 285 | map->bus_context = bus_context; |
2e2ae66d MB |
286 | map->max_register = config->max_register; |
287 | map->writeable_reg = config->writeable_reg; | |
288 | map->readable_reg = config->readable_reg; | |
289 | map->volatile_reg = config->volatile_reg; | |
2efe1642 | 290 | map->precious_reg = config->precious_reg; |
5d1729e7 | 291 | map->cache_type = config->cache_type; |
72b39f6f | 292 | map->name = config->name; |
b83a313b | 293 | |
6f306441 LPC |
294 | if (config->read_flag_mask || config->write_flag_mask) { |
295 | map->read_flag_mask = config->read_flag_mask; | |
296 | map->write_flag_mask = config->write_flag_mask; | |
297 | } else { | |
298 | map->read_flag_mask = bus->read_flag_mask; | |
299 | } | |
300 | ||
141eba2e SW |
301 | reg_endian = config->reg_format_endian; |
302 | if (reg_endian == REGMAP_ENDIAN_DEFAULT) | |
303 | reg_endian = bus->reg_format_endian_default; | |
304 | if (reg_endian == REGMAP_ENDIAN_DEFAULT) | |
305 | reg_endian = REGMAP_ENDIAN_BIG; | |
306 | ||
307 | val_endian = config->val_format_endian; | |
308 | if (val_endian == REGMAP_ENDIAN_DEFAULT) | |
309 | val_endian = bus->val_format_endian_default; | |
310 | if (val_endian == REGMAP_ENDIAN_DEFAULT) | |
311 | val_endian = REGMAP_ENDIAN_BIG; | |
312 | ||
d939fb9a | 313 | switch (config->reg_bits + map->reg_shift) { |
9aa50750 WS |
314 | case 2: |
315 | switch (config->val_bits) { | |
316 | case 6: | |
317 | map->format.format_write = regmap_format_2_6_write; | |
318 | break; | |
319 | default: | |
320 | goto err_map; | |
321 | } | |
322 | break; | |
323 | ||
b83a313b MB |
324 | case 4: |
325 | switch (config->val_bits) { | |
326 | case 12: | |
327 | map->format.format_write = regmap_format_4_12_write; | |
328 | break; | |
329 | default: | |
330 | goto err_map; | |
331 | } | |
332 | break; | |
333 | ||
334 | case 7: | |
335 | switch (config->val_bits) { | |
336 | case 9: | |
337 | map->format.format_write = regmap_format_7_9_write; | |
338 | break; | |
339 | default: | |
340 | goto err_map; | |
341 | } | |
342 | break; | |
343 | ||
7e5ec63e LPC |
344 | case 10: |
345 | switch (config->val_bits) { | |
346 | case 14: | |
347 | map->format.format_write = regmap_format_10_14_write; | |
348 | break; | |
349 | default: | |
350 | goto err_map; | |
351 | } | |
352 | break; | |
353 | ||
b83a313b MB |
354 | case 8: |
355 | map->format.format_reg = regmap_format_8; | |
356 | break; | |
357 | ||
358 | case 16: | |
141eba2e SW |
359 | switch (reg_endian) { |
360 | case REGMAP_ENDIAN_BIG: | |
361 | map->format.format_reg = regmap_format_16_be; | |
362 | break; | |
363 | case REGMAP_ENDIAN_NATIVE: | |
364 | map->format.format_reg = regmap_format_16_native; | |
365 | break; | |
366 | default: | |
367 | goto err_map; | |
368 | } | |
b83a313b MB |
369 | break; |
370 | ||
7d5e525b | 371 | case 32: |
141eba2e SW |
372 | switch (reg_endian) { |
373 | case REGMAP_ENDIAN_BIG: | |
374 | map->format.format_reg = regmap_format_32_be; | |
375 | break; | |
376 | case REGMAP_ENDIAN_NATIVE: | |
377 | map->format.format_reg = regmap_format_32_native; | |
378 | break; | |
379 | default: | |
380 | goto err_map; | |
381 | } | |
7d5e525b MB |
382 | break; |
383 | ||
b83a313b MB |
384 | default: |
385 | goto err_map; | |
386 | } | |
387 | ||
388 | switch (config->val_bits) { | |
389 | case 8: | |
390 | map->format.format_val = regmap_format_8; | |
391 | map->format.parse_val = regmap_parse_8; | |
392 | break; | |
393 | case 16: | |
141eba2e SW |
394 | switch (val_endian) { |
395 | case REGMAP_ENDIAN_BIG: | |
396 | map->format.format_val = regmap_format_16_be; | |
397 | map->format.parse_val = regmap_parse_16_be; | |
398 | break; | |
399 | case REGMAP_ENDIAN_NATIVE: | |
400 | map->format.format_val = regmap_format_16_native; | |
401 | map->format.parse_val = regmap_parse_16_native; | |
402 | break; | |
403 | default: | |
404 | goto err_map; | |
405 | } | |
b83a313b | 406 | break; |
ea279fc5 | 407 | case 24: |
141eba2e SW |
408 | if (val_endian != REGMAP_ENDIAN_BIG) |
409 | goto err_map; | |
ea279fc5 MR |
410 | map->format.format_val = regmap_format_24; |
411 | map->format.parse_val = regmap_parse_24; | |
412 | break; | |
7d5e525b | 413 | case 32: |
141eba2e SW |
414 | switch (val_endian) { |
415 | case REGMAP_ENDIAN_BIG: | |
416 | map->format.format_val = regmap_format_32_be; | |
417 | map->format.parse_val = regmap_parse_32_be; | |
418 | break; | |
419 | case REGMAP_ENDIAN_NATIVE: | |
420 | map->format.format_val = regmap_format_32_native; | |
421 | map->format.parse_val = regmap_parse_32_native; | |
422 | break; | |
423 | default: | |
424 | goto err_map; | |
425 | } | |
7d5e525b | 426 | break; |
b83a313b MB |
427 | } |
428 | ||
141eba2e SW |
429 | if (map->format.format_write) { |
430 | if ((reg_endian != REGMAP_ENDIAN_BIG) || | |
431 | (val_endian != REGMAP_ENDIAN_BIG)) | |
432 | goto err_map; | |
7a647614 | 433 | map->use_single_rw = true; |
141eba2e | 434 | } |
7a647614 | 435 | |
b83a313b MB |
436 | if (!map->format.format_write && |
437 | !(map->format.format_reg && map->format.format_val)) | |
438 | goto err_map; | |
439 | ||
82159ba8 | 440 | map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); |
b83a313b MB |
441 | if (map->work_buf == NULL) { |
442 | ret = -ENOMEM; | |
5204f5e3 | 443 | goto err_map; |
b83a313b MB |
444 | } |
445 | ||
d3c242e1 | 446 | regmap_debugfs_init(map, config->name); |
052d2cd1 | 447 | |
e5e3b8ab | 448 | ret = regcache_init(map, config); |
5d1729e7 | 449 | if (ret < 0) |
58072cbf | 450 | goto err_free_workbuf; |
5d1729e7 | 451 | |
72b39f6f MB |
452 | /* Add a devres resource for dev_get_regmap() */ |
453 | m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL); | |
454 | if (!m) { | |
455 | ret = -ENOMEM; | |
456 | goto err_cache; | |
457 | } | |
458 | *m = map; | |
459 | devres_add(dev, m); | |
460 | ||
b83a313b MB |
461 | return map; |
462 | ||
72b39f6f MB |
463 | err_cache: |
464 | regcache_exit(map); | |
58072cbf LPC |
465 | err_free_workbuf: |
466 | kfree(map->work_buf); | |
b83a313b MB |
467 | err_map: |
468 | kfree(map); | |
469 | err: | |
470 | return ERR_PTR(ret); | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(regmap_init); | |
473 | ||
c0eb4676 MB |
474 | static void devm_regmap_release(struct device *dev, void *res) |
475 | { | |
476 | regmap_exit(*(struct regmap **)res); | |
477 | } | |
478 | ||
479 | /** | |
480 | * devm_regmap_init(): Initialise managed register map | |
481 | * | |
482 | * @dev: Device that will be interacted with | |
483 | * @bus: Bus-specific callbacks to use with device | |
0135bbcc | 484 | * @bus_context: Data passed to bus-specific callbacks |
c0eb4676 MB |
485 | * @config: Configuration for register map |
486 | * | |
487 | * The return value will be an ERR_PTR() on error or a valid pointer | |
488 | * to a struct regmap. This function should generally not be called | |
489 | * directly, it should be called by bus-specific init functions. The | |
490 | * map will be automatically freed by the device management code. | |
491 | */ | |
492 | struct regmap *devm_regmap_init(struct device *dev, | |
493 | const struct regmap_bus *bus, | |
0135bbcc | 494 | void *bus_context, |
c0eb4676 MB |
495 | const struct regmap_config *config) |
496 | { | |
497 | struct regmap **ptr, *regmap; | |
498 | ||
499 | ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); | |
500 | if (!ptr) | |
501 | return ERR_PTR(-ENOMEM); | |
502 | ||
0135bbcc | 503 | regmap = regmap_init(dev, bus, bus_context, config); |
c0eb4676 MB |
504 | if (!IS_ERR(regmap)) { |
505 | *ptr = regmap; | |
506 | devres_add(dev, ptr); | |
507 | } else { | |
508 | devres_free(ptr); | |
509 | } | |
510 | ||
511 | return regmap; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(devm_regmap_init); | |
514 | ||
bf315173 MB |
515 | /** |
516 | * regmap_reinit_cache(): Reinitialise the current register cache | |
517 | * | |
518 | * @map: Register map to operate on. | |
519 | * @config: New configuration. Only the cache data will be used. | |
520 | * | |
521 | * Discard any existing register cache for the map and initialize a | |
522 | * new cache. This can be used to restore the cache to defaults or to | |
523 | * update the cache configuration to reflect runtime discovery of the | |
524 | * hardware. | |
525 | */ | |
526 | int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) | |
527 | { | |
528 | int ret; | |
529 | ||
bacdbe07 | 530 | map->lock(map); |
bf315173 MB |
531 | |
532 | regcache_exit(map); | |
a24f64a6 | 533 | regmap_debugfs_exit(map); |
bf315173 MB |
534 | |
535 | map->max_register = config->max_register; | |
536 | map->writeable_reg = config->writeable_reg; | |
537 | map->readable_reg = config->readable_reg; | |
538 | map->volatile_reg = config->volatile_reg; | |
539 | map->precious_reg = config->precious_reg; | |
540 | map->cache_type = config->cache_type; | |
541 | ||
d3c242e1 | 542 | regmap_debugfs_init(map, config->name); |
a24f64a6 | 543 | |
421e8d2d MB |
544 | map->cache_bypass = false; |
545 | map->cache_only = false; | |
546 | ||
bf315173 MB |
547 | ret = regcache_init(map, config); |
548 | ||
bacdbe07 | 549 | map->unlock(map); |
bf315173 MB |
550 | |
551 | return ret; | |
552 | } | |
553 | ||
b83a313b MB |
554 | /** |
555 | * regmap_exit(): Free a previously allocated register map | |
556 | */ | |
557 | void regmap_exit(struct regmap *map) | |
558 | { | |
5d1729e7 | 559 | regcache_exit(map); |
31244e39 | 560 | regmap_debugfs_exit(map); |
0135bbcc SW |
561 | if (map->bus->free_context) |
562 | map->bus->free_context(map->bus_context); | |
b83a313b | 563 | kfree(map->work_buf); |
b83a313b MB |
564 | kfree(map); |
565 | } | |
566 | EXPORT_SYMBOL_GPL(regmap_exit); | |
567 | ||
72b39f6f MB |
568 | static int dev_get_regmap_match(struct device *dev, void *res, void *data) |
569 | { | |
570 | struct regmap **r = res; | |
571 | if (!r || !*r) { | |
572 | WARN_ON(!r || !*r); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | /* If the user didn't specify a name match any */ | |
577 | if (data) | |
578 | return (*r)->name == data; | |
579 | else | |
580 | return 1; | |
581 | } | |
582 | ||
583 | /** | |
584 | * dev_get_regmap(): Obtain the regmap (if any) for a device | |
585 | * | |
586 | * @dev: Device to retrieve the map for | |
587 | * @name: Optional name for the register map, usually NULL. | |
588 | * | |
589 | * Returns the regmap for the device if one is present, or NULL. If | |
590 | * name is specified then it must match the name specified when | |
591 | * registering the device, if it is NULL then the first regmap found | |
592 | * will be used. Devices with multiple register maps are very rare, | |
593 | * generic code should normally not need to specify a name. | |
594 | */ | |
595 | struct regmap *dev_get_regmap(struct device *dev, const char *name) | |
596 | { | |
597 | struct regmap **r = devres_find(dev, dev_get_regmap_release, | |
598 | dev_get_regmap_match, (void *)name); | |
599 | ||
600 | if (!r) | |
601 | return NULL; | |
602 | return *r; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(dev_get_regmap); | |
605 | ||
b83a313b MB |
606 | static int _regmap_raw_write(struct regmap *map, unsigned int reg, |
607 | const void *val, size_t val_len) | |
608 | { | |
6f306441 | 609 | u8 *u8 = map->work_buf; |
b83a313b MB |
610 | void *buf; |
611 | int ret = -ENOTSUPP; | |
612 | size_t len; | |
73304781 MB |
613 | int i; |
614 | ||
615 | /* Check for unwritable registers before we start */ | |
616 | if (map->writeable_reg) | |
617 | for (i = 0; i < val_len / map->format.val_bytes; i++) | |
f01ee60f SW |
618 | if (!map->writeable_reg(map->dev, |
619 | reg + (i * map->reg_stride))) | |
73304781 | 620 | return -EINVAL; |
b83a313b | 621 | |
c9157198 LD |
622 | if (!map->cache_bypass && map->format.parse_val) { |
623 | unsigned int ival; | |
624 | int val_bytes = map->format.val_bytes; | |
625 | for (i = 0; i < val_len / val_bytes; i++) { | |
626 | memcpy(map->work_buf, val + (i * val_bytes), val_bytes); | |
627 | ival = map->format.parse_val(map->work_buf); | |
f01ee60f SW |
628 | ret = regcache_write(map, reg + (i * map->reg_stride), |
629 | ival); | |
c9157198 LD |
630 | if (ret) { |
631 | dev_err(map->dev, | |
632 | "Error in caching of register: %u ret: %d\n", | |
633 | reg + i, ret); | |
634 | return ret; | |
635 | } | |
636 | } | |
637 | if (map->cache_only) { | |
638 | map->cache_dirty = true; | |
639 | return 0; | |
640 | } | |
641 | } | |
642 | ||
d939fb9a | 643 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b | 644 | |
6f306441 LPC |
645 | u8[0] |= map->write_flag_mask; |
646 | ||
fb2736bb MB |
647 | trace_regmap_hw_write_start(map->dev, reg, |
648 | val_len / map->format.val_bytes); | |
649 | ||
2547e201 MB |
650 | /* If we're doing a single register write we can probably just |
651 | * send the work_buf directly, otherwise try to do a gather | |
652 | * write. | |
653 | */ | |
82159ba8 MB |
654 | if (val == (map->work_buf + map->format.pad_bytes + |
655 | map->format.reg_bytes)) | |
0135bbcc | 656 | ret = map->bus->write(map->bus_context, map->work_buf, |
82159ba8 MB |
657 | map->format.reg_bytes + |
658 | map->format.pad_bytes + | |
659 | val_len); | |
2547e201 | 660 | else if (map->bus->gather_write) |
0135bbcc | 661 | ret = map->bus->gather_write(map->bus_context, map->work_buf, |
82159ba8 MB |
662 | map->format.reg_bytes + |
663 | map->format.pad_bytes, | |
b83a313b MB |
664 | val, val_len); |
665 | ||
2547e201 | 666 | /* If that didn't work fall back on linearising by hand. */ |
b83a313b | 667 | if (ret == -ENOTSUPP) { |
82159ba8 MB |
668 | len = map->format.reg_bytes + map->format.pad_bytes + val_len; |
669 | buf = kzalloc(len, GFP_KERNEL); | |
b83a313b MB |
670 | if (!buf) |
671 | return -ENOMEM; | |
672 | ||
673 | memcpy(buf, map->work_buf, map->format.reg_bytes); | |
82159ba8 MB |
674 | memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, |
675 | val, val_len); | |
0135bbcc | 676 | ret = map->bus->write(map->bus_context, buf, len); |
b83a313b MB |
677 | |
678 | kfree(buf); | |
679 | } | |
680 | ||
fb2736bb MB |
681 | trace_regmap_hw_write_done(map->dev, reg, |
682 | val_len / map->format.val_bytes); | |
683 | ||
b83a313b MB |
684 | return ret; |
685 | } | |
686 | ||
4d2dc095 DP |
687 | int _regmap_write(struct regmap *map, unsigned int reg, |
688 | unsigned int val) | |
b83a313b | 689 | { |
fb2736bb | 690 | int ret; |
b83a313b MB |
691 | BUG_ON(!map->format.format_write && !map->format.format_val); |
692 | ||
c9157198 | 693 | if (!map->cache_bypass && map->format.format_write) { |
5d1729e7 DP |
694 | ret = regcache_write(map, reg, val); |
695 | if (ret != 0) | |
696 | return ret; | |
8ae0d7e8 MB |
697 | if (map->cache_only) { |
698 | map->cache_dirty = true; | |
5d1729e7 | 699 | return 0; |
8ae0d7e8 | 700 | } |
5d1729e7 DP |
701 | } |
702 | ||
fb2736bb MB |
703 | trace_regmap_reg_write(map->dev, reg, val); |
704 | ||
b83a313b MB |
705 | if (map->format.format_write) { |
706 | map->format.format_write(map, reg, val); | |
707 | ||
fb2736bb MB |
708 | trace_regmap_hw_write_start(map->dev, reg, 1); |
709 | ||
0135bbcc | 710 | ret = map->bus->write(map->bus_context, map->work_buf, |
fb2736bb MB |
711 | map->format.buf_size); |
712 | ||
713 | trace_regmap_hw_write_done(map->dev, reg, 1); | |
714 | ||
715 | return ret; | |
b83a313b | 716 | } else { |
82159ba8 | 717 | map->format.format_val(map->work_buf + map->format.reg_bytes |
d939fb9a | 718 | + map->format.pad_bytes, val, 0); |
b83a313b | 719 | return _regmap_raw_write(map, reg, |
82159ba8 MB |
720 | map->work_buf + |
721 | map->format.reg_bytes + | |
722 | map->format.pad_bytes, | |
b83a313b MB |
723 | map->format.val_bytes); |
724 | } | |
725 | } | |
726 | ||
727 | /** | |
728 | * regmap_write(): Write a value to a single register | |
729 | * | |
730 | * @map: Register map to write to | |
731 | * @reg: Register to write to | |
732 | * @val: Value to be written | |
733 | * | |
734 | * A value of zero will be returned on success, a negative errno will | |
735 | * be returned in error cases. | |
736 | */ | |
737 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) | |
738 | { | |
739 | int ret; | |
740 | ||
f01ee60f SW |
741 | if (reg % map->reg_stride) |
742 | return -EINVAL; | |
743 | ||
bacdbe07 | 744 | map->lock(map); |
b83a313b MB |
745 | |
746 | ret = _regmap_write(map, reg, val); | |
747 | ||
bacdbe07 | 748 | map->unlock(map); |
b83a313b MB |
749 | |
750 | return ret; | |
751 | } | |
752 | EXPORT_SYMBOL_GPL(regmap_write); | |
753 | ||
754 | /** | |
755 | * regmap_raw_write(): Write raw values to one or more registers | |
756 | * | |
757 | * @map: Register map to write to | |
758 | * @reg: Initial register to write to | |
759 | * @val: Block of data to be written, laid out for direct transmission to the | |
760 | * device | |
761 | * @val_len: Length of data pointed to by val. | |
762 | * | |
763 | * This function is intended to be used for things like firmware | |
764 | * download where a large block of data needs to be transferred to the | |
765 | * device. No formatting will be done on the data provided. | |
766 | * | |
767 | * A value of zero will be returned on success, a negative errno will | |
768 | * be returned in error cases. | |
769 | */ | |
770 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
771 | const void *val, size_t val_len) | |
772 | { | |
773 | int ret; | |
774 | ||
851960ba SW |
775 | if (val_len % map->format.val_bytes) |
776 | return -EINVAL; | |
f01ee60f SW |
777 | if (reg % map->reg_stride) |
778 | return -EINVAL; | |
851960ba | 779 | |
bacdbe07 | 780 | map->lock(map); |
b83a313b MB |
781 | |
782 | ret = _regmap_raw_write(map, reg, val, val_len); | |
783 | ||
bacdbe07 | 784 | map->unlock(map); |
b83a313b MB |
785 | |
786 | return ret; | |
787 | } | |
788 | EXPORT_SYMBOL_GPL(regmap_raw_write); | |
789 | ||
8eaeb219 LD |
790 | /* |
791 | * regmap_bulk_write(): Write multiple registers to the device | |
792 | * | |
793 | * @map: Register map to write to | |
794 | * @reg: First register to be write from | |
795 | * @val: Block of data to be written, in native register size for device | |
796 | * @val_count: Number of registers to write | |
797 | * | |
798 | * This function is intended to be used for writing a large block of | |
799 | * data to be device either in single transfer or multiple transfer. | |
800 | * | |
801 | * A value of zero will be returned on success, a negative errno will | |
802 | * be returned in error cases. | |
803 | */ | |
804 | int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, | |
805 | size_t val_count) | |
806 | { | |
807 | int ret = 0, i; | |
808 | size_t val_bytes = map->format.val_bytes; | |
809 | void *wval; | |
810 | ||
811 | if (!map->format.parse_val) | |
812 | return -EINVAL; | |
f01ee60f SW |
813 | if (reg % map->reg_stride) |
814 | return -EINVAL; | |
8eaeb219 | 815 | |
bacdbe07 | 816 | map->lock(map); |
8eaeb219 LD |
817 | |
818 | /* No formatting is require if val_byte is 1 */ | |
819 | if (val_bytes == 1) { | |
820 | wval = (void *)val; | |
821 | } else { | |
822 | wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL); | |
823 | if (!wval) { | |
824 | ret = -ENOMEM; | |
825 | dev_err(map->dev, "Error in memory allocation\n"); | |
826 | goto out; | |
827 | } | |
828 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
829 | map->format.parse_val(wval + i); | |
830 | } | |
2e33caf1 AJ |
831 | /* |
832 | * Some devices does not support bulk write, for | |
833 | * them we have a series of single write operations. | |
834 | */ | |
835 | if (map->use_single_rw) { | |
836 | for (i = 0; i < val_count; i++) { | |
837 | ret = regmap_raw_write(map, | |
838 | reg + (i * map->reg_stride), | |
839 | val + (i * val_bytes), | |
840 | val_bytes); | |
841 | if (ret != 0) | |
842 | return ret; | |
843 | } | |
844 | } else { | |
845 | ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count); | |
846 | } | |
8eaeb219 LD |
847 | |
848 | if (val_bytes != 1) | |
849 | kfree(wval); | |
850 | ||
851 | out: | |
bacdbe07 | 852 | map->unlock(map); |
8eaeb219 LD |
853 | return ret; |
854 | } | |
855 | EXPORT_SYMBOL_GPL(regmap_bulk_write); | |
856 | ||
b83a313b MB |
857 | static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, |
858 | unsigned int val_len) | |
859 | { | |
860 | u8 *u8 = map->work_buf; | |
861 | int ret; | |
862 | ||
d939fb9a | 863 | map->format.format_reg(map->work_buf, reg, map->reg_shift); |
b83a313b MB |
864 | |
865 | /* | |
6f306441 | 866 | * Some buses or devices flag reads by setting the high bits in the |
b83a313b MB |
867 | * register addresss; since it's always the high bits for all |
868 | * current formats we can do this here rather than in | |
869 | * formatting. This may break if we get interesting formats. | |
870 | */ | |
6f306441 | 871 | u8[0] |= map->read_flag_mask; |
b83a313b | 872 | |
fb2736bb MB |
873 | trace_regmap_hw_read_start(map->dev, reg, |
874 | val_len / map->format.val_bytes); | |
875 | ||
0135bbcc | 876 | ret = map->bus->read(map->bus_context, map->work_buf, |
82159ba8 | 877 | map->format.reg_bytes + map->format.pad_bytes, |
40c5cc26 | 878 | val, val_len); |
b83a313b | 879 | |
fb2736bb MB |
880 | trace_regmap_hw_read_done(map->dev, reg, |
881 | val_len / map->format.val_bytes); | |
882 | ||
883 | return ret; | |
b83a313b MB |
884 | } |
885 | ||
886 | static int _regmap_read(struct regmap *map, unsigned int reg, | |
887 | unsigned int *val) | |
888 | { | |
889 | int ret; | |
890 | ||
5d1729e7 DP |
891 | if (!map->cache_bypass) { |
892 | ret = regcache_read(map, reg, val); | |
893 | if (ret == 0) | |
894 | return 0; | |
895 | } | |
896 | ||
19254411 LPC |
897 | if (!map->format.parse_val) |
898 | return -EINVAL; | |
899 | ||
5d1729e7 DP |
900 | if (map->cache_only) |
901 | return -EBUSY; | |
902 | ||
b83a313b | 903 | ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); |
fb2736bb | 904 | if (ret == 0) { |
b83a313b | 905 | *val = map->format.parse_val(map->work_buf); |
fb2736bb MB |
906 | trace_regmap_reg_read(map->dev, reg, *val); |
907 | } | |
b83a313b | 908 | |
f2985367 MB |
909 | if (ret == 0 && !map->cache_bypass) |
910 | regcache_write(map, reg, *val); | |
911 | ||
b83a313b MB |
912 | return ret; |
913 | } | |
914 | ||
915 | /** | |
916 | * regmap_read(): Read a value from a single register | |
917 | * | |
918 | * @map: Register map to write to | |
919 | * @reg: Register to be read from | |
920 | * @val: Pointer to store read value | |
921 | * | |
922 | * A value of zero will be returned on success, a negative errno will | |
923 | * be returned in error cases. | |
924 | */ | |
925 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) | |
926 | { | |
927 | int ret; | |
928 | ||
f01ee60f SW |
929 | if (reg % map->reg_stride) |
930 | return -EINVAL; | |
931 | ||
bacdbe07 | 932 | map->lock(map); |
b83a313b MB |
933 | |
934 | ret = _regmap_read(map, reg, val); | |
935 | ||
bacdbe07 | 936 | map->unlock(map); |
b83a313b MB |
937 | |
938 | return ret; | |
939 | } | |
940 | EXPORT_SYMBOL_GPL(regmap_read); | |
941 | ||
942 | /** | |
943 | * regmap_raw_read(): Read raw data from the device | |
944 | * | |
945 | * @map: Register map to write to | |
946 | * @reg: First register to be read from | |
947 | * @val: Pointer to store read value | |
948 | * @val_len: Size of data to read | |
949 | * | |
950 | * A value of zero will be returned on success, a negative errno will | |
951 | * be returned in error cases. | |
952 | */ | |
953 | int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, | |
954 | size_t val_len) | |
955 | { | |
b8fb5ab1 MB |
956 | size_t val_bytes = map->format.val_bytes; |
957 | size_t val_count = val_len / val_bytes; | |
958 | unsigned int v; | |
959 | int ret, i; | |
04e016ad | 960 | |
851960ba SW |
961 | if (val_len % map->format.val_bytes) |
962 | return -EINVAL; | |
f01ee60f SW |
963 | if (reg % map->reg_stride) |
964 | return -EINVAL; | |
851960ba | 965 | |
bacdbe07 | 966 | map->lock(map); |
b83a313b | 967 | |
b8fb5ab1 MB |
968 | if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || |
969 | map->cache_type == REGCACHE_NONE) { | |
970 | /* Physical block read if there's no cache involved */ | |
971 | ret = _regmap_raw_read(map, reg, val, val_len); | |
972 | ||
973 | } else { | |
974 | /* Otherwise go word by word for the cache; should be low | |
975 | * cost as we expect to hit the cache. | |
976 | */ | |
977 | for (i = 0; i < val_count; i++) { | |
f01ee60f SW |
978 | ret = _regmap_read(map, reg + (i * map->reg_stride), |
979 | &v); | |
b8fb5ab1 MB |
980 | if (ret != 0) |
981 | goto out; | |
982 | ||
d939fb9a | 983 | map->format.format_val(val + (i * val_bytes), v, 0); |
b8fb5ab1 MB |
984 | } |
985 | } | |
b83a313b | 986 | |
b8fb5ab1 | 987 | out: |
bacdbe07 | 988 | map->unlock(map); |
b83a313b MB |
989 | |
990 | return ret; | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(regmap_raw_read); | |
993 | ||
994 | /** | |
995 | * regmap_bulk_read(): Read multiple registers from the device | |
996 | * | |
997 | * @map: Register map to write to | |
998 | * @reg: First register to be read from | |
999 | * @val: Pointer to store read value, in native register size for device | |
1000 | * @val_count: Number of registers to read | |
1001 | * | |
1002 | * A value of zero will be returned on success, a negative errno will | |
1003 | * be returned in error cases. | |
1004 | */ | |
1005 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
1006 | size_t val_count) | |
1007 | { | |
1008 | int ret, i; | |
1009 | size_t val_bytes = map->format.val_bytes; | |
82cd9965 | 1010 | bool vol = regmap_volatile_range(map, reg, val_count); |
5d1729e7 | 1011 | |
b83a313b MB |
1012 | if (!map->format.parse_val) |
1013 | return -EINVAL; | |
f01ee60f SW |
1014 | if (reg % map->reg_stride) |
1015 | return -EINVAL; | |
b83a313b | 1016 | |
de2d808f | 1017 | if (vol || map->cache_type == REGCACHE_NONE) { |
2e33caf1 AJ |
1018 | /* |
1019 | * Some devices does not support bulk read, for | |
1020 | * them we have a series of single read operations. | |
1021 | */ | |
1022 | if (map->use_single_rw) { | |
1023 | for (i = 0; i < val_count; i++) { | |
1024 | ret = regmap_raw_read(map, | |
1025 | reg + (i * map->reg_stride), | |
1026 | val + (i * val_bytes), | |
1027 | val_bytes); | |
1028 | if (ret != 0) | |
1029 | return ret; | |
1030 | } | |
1031 | } else { | |
1032 | ret = regmap_raw_read(map, reg, val, | |
1033 | val_bytes * val_count); | |
1034 | if (ret != 0) | |
1035 | return ret; | |
1036 | } | |
de2d808f MB |
1037 | |
1038 | for (i = 0; i < val_count * val_bytes; i += val_bytes) | |
1039 | map->format.parse_val(val + i); | |
1040 | } else { | |
1041 | for (i = 0; i < val_count; i++) { | |
6560ffd1 | 1042 | unsigned int ival; |
f01ee60f | 1043 | ret = regmap_read(map, reg + (i * map->reg_stride), |
25061d28 | 1044 | &ival); |
de2d808f MB |
1045 | if (ret != 0) |
1046 | return ret; | |
6560ffd1 | 1047 | memcpy(val + (i * val_bytes), &ival, val_bytes); |
de2d808f MB |
1048 | } |
1049 | } | |
b83a313b MB |
1050 | |
1051 | return 0; | |
1052 | } | |
1053 | EXPORT_SYMBOL_GPL(regmap_bulk_read); | |
1054 | ||
018690d3 MB |
1055 | static int _regmap_update_bits(struct regmap *map, unsigned int reg, |
1056 | unsigned int mask, unsigned int val, | |
1057 | bool *change) | |
b83a313b MB |
1058 | { |
1059 | int ret; | |
d91e8db2 | 1060 | unsigned int tmp, orig; |
b83a313b | 1061 | |
bacdbe07 | 1062 | map->lock(map); |
b83a313b | 1063 | |
d91e8db2 | 1064 | ret = _regmap_read(map, reg, &orig); |
b83a313b MB |
1065 | if (ret != 0) |
1066 | goto out; | |
1067 | ||
d91e8db2 | 1068 | tmp = orig & ~mask; |
b83a313b MB |
1069 | tmp |= val & mask; |
1070 | ||
018690d3 | 1071 | if (tmp != orig) { |
d91e8db2 | 1072 | ret = _regmap_write(map, reg, tmp); |
018690d3 MB |
1073 | *change = true; |
1074 | } else { | |
1075 | *change = false; | |
1076 | } | |
b83a313b MB |
1077 | |
1078 | out: | |
bacdbe07 | 1079 | map->unlock(map); |
b83a313b MB |
1080 | |
1081 | return ret; | |
1082 | } | |
018690d3 MB |
1083 | |
1084 | /** | |
1085 | * regmap_update_bits: Perform a read/modify/write cycle on the register map | |
1086 | * | |
1087 | * @map: Register map to update | |
1088 | * @reg: Register to update | |
1089 | * @mask: Bitmask to change | |
1090 | * @val: New value for bitmask | |
1091 | * | |
1092 | * Returns zero for success, a negative number on error. | |
1093 | */ | |
1094 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
1095 | unsigned int mask, unsigned int val) | |
1096 | { | |
1097 | bool change; | |
1098 | return _regmap_update_bits(map, reg, mask, val, &change); | |
1099 | } | |
b83a313b | 1100 | EXPORT_SYMBOL_GPL(regmap_update_bits); |
31244e39 | 1101 | |
018690d3 MB |
1102 | /** |
1103 | * regmap_update_bits_check: Perform a read/modify/write cycle on the | |
1104 | * register map and report if updated | |
1105 | * | |
1106 | * @map: Register map to update | |
1107 | * @reg: Register to update | |
1108 | * @mask: Bitmask to change | |
1109 | * @val: New value for bitmask | |
1110 | * @change: Boolean indicating if a write was done | |
1111 | * | |
1112 | * Returns zero for success, a negative number on error. | |
1113 | */ | |
1114 | int regmap_update_bits_check(struct regmap *map, unsigned int reg, | |
1115 | unsigned int mask, unsigned int val, | |
1116 | bool *change) | |
1117 | { | |
1118 | return _regmap_update_bits(map, reg, mask, val, change); | |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(regmap_update_bits_check); | |
1121 | ||
22f0d90a MB |
1122 | /** |
1123 | * regmap_register_patch: Register and apply register updates to be applied | |
1124 | * on device initialistion | |
1125 | * | |
1126 | * @map: Register map to apply updates to. | |
1127 | * @regs: Values to update. | |
1128 | * @num_regs: Number of entries in regs. | |
1129 | * | |
1130 | * Register a set of register updates to be applied to the device | |
1131 | * whenever the device registers are synchronised with the cache and | |
1132 | * apply them immediately. Typically this is used to apply | |
1133 | * corrections to be applied to the device defaults on startup, such | |
1134 | * as the updates some vendors provide to undocumented registers. | |
1135 | */ | |
1136 | int regmap_register_patch(struct regmap *map, const struct reg_default *regs, | |
1137 | int num_regs) | |
1138 | { | |
1139 | int i, ret; | |
1140 | bool bypass; | |
1141 | ||
1142 | /* If needed the implementation can be extended to support this */ | |
1143 | if (map->patch) | |
1144 | return -EBUSY; | |
1145 | ||
bacdbe07 | 1146 | map->lock(map); |
22f0d90a MB |
1147 | |
1148 | bypass = map->cache_bypass; | |
1149 | ||
1150 | map->cache_bypass = true; | |
1151 | ||
1152 | /* Write out first; it's useful to apply even if we fail later. */ | |
1153 | for (i = 0; i < num_regs; i++) { | |
1154 | ret = _regmap_write(map, regs[i].reg, regs[i].def); | |
1155 | if (ret != 0) { | |
1156 | dev_err(map->dev, "Failed to write %x = %x: %d\n", | |
1157 | regs[i].reg, regs[i].def, ret); | |
1158 | goto out; | |
1159 | } | |
1160 | } | |
1161 | ||
2a14d7d9 | 1162 | map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL); |
22f0d90a MB |
1163 | if (map->patch != NULL) { |
1164 | memcpy(map->patch, regs, | |
1165 | num_regs * sizeof(struct reg_default)); | |
1166 | map->patch_regs = num_regs; | |
1167 | } else { | |
1168 | ret = -ENOMEM; | |
1169 | } | |
1170 | ||
1171 | out: | |
1172 | map->cache_bypass = bypass; | |
1173 | ||
bacdbe07 | 1174 | map->unlock(map); |
22f0d90a MB |
1175 | |
1176 | return ret; | |
1177 | } | |
1178 | EXPORT_SYMBOL_GPL(regmap_register_patch); | |
1179 | ||
eae4b51b | 1180 | /* |
a6539c32 MB |
1181 | * regmap_get_val_bytes(): Report the size of a register value |
1182 | * | |
1183 | * Report the size of a register value, mainly intended to for use by | |
1184 | * generic infrastructure built on top of regmap. | |
1185 | */ | |
1186 | int regmap_get_val_bytes(struct regmap *map) | |
1187 | { | |
1188 | if (map->format.format_write) | |
1189 | return -EINVAL; | |
1190 | ||
1191 | return map->format.val_bytes; | |
1192 | } | |
1193 | EXPORT_SYMBOL_GPL(regmap_get_val_bytes); | |
1194 | ||
31244e39 MB |
1195 | static int __init regmap_initcall(void) |
1196 | { | |
1197 | regmap_debugfs_initcall(); | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | postcore_initcall(regmap_initcall); |