Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4d75faa0 TI |
2 | /* |
3 | * Regmap support for HD-audio verbs | |
4 | * | |
5 | * A virtual register is translated to one or more hda verbs for write, | |
6 | * vice versa for read. | |
7 | * | |
8 | * A few limitations: | |
9 | * - Provided for not all verbs but only subset standard non-volatile verbs. | |
10 | * - For reading, only AC_VERB_GET_* variants can be used. | |
11 | * - For writing, mapped to the *corresponding* AC_VERB_SET_* variants, | |
12 | * so can't handle asymmetric verbs for read and write | |
13 | */ | |
14 | ||
15 | #include <linux/slab.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/export.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/pm_runtime.h> | |
21 | #include <sound/core.h> | |
22 | #include <sound/hdaudio.h> | |
23 | #include <sound/hda_regmap.h> | |
ddf7cb83 | 24 | #include "local.h" |
4d75faa0 | 25 | |
fc4f000b TI |
26 | static int codec_pm_lock(struct hdac_device *codec) |
27 | { | |
28 | return snd_hdac_keep_power_up(codec); | |
29 | } | |
30 | ||
31 | static void codec_pm_unlock(struct hdac_device *codec, int lock) | |
32 | { | |
33 | if (lock == 1) | |
34 | snd_hdac_power_down_pm(codec); | |
35 | } | |
4d75faa0 TI |
36 | |
37 | #define get_verb(reg) (((reg) >> 8) & 0xfff) | |
38 | ||
39 | static bool hda_volatile_reg(struct device *dev, unsigned int reg) | |
40 | { | |
40ba66a7 | 41 | struct hdac_device *codec = dev_to_hdac_dev(dev); |
4d75faa0 TI |
42 | unsigned int verb = get_verb(reg); |
43 | ||
44 | switch (verb) { | |
45 | case AC_VERB_GET_PROC_COEF: | |
40ba66a7 | 46 | return !codec->cache_coef; |
4d75faa0 TI |
47 | case AC_VERB_GET_COEF_INDEX: |
48 | case AC_VERB_GET_PROC_STATE: | |
49 | case AC_VERB_GET_POWER_STATE: | |
50 | case AC_VERB_GET_PIN_SENSE: | |
51 | case AC_VERB_GET_HDMI_DIP_SIZE: | |
52 | case AC_VERB_GET_HDMI_ELDD: | |
53 | case AC_VERB_GET_HDMI_DIP_INDEX: | |
54 | case AC_VERB_GET_HDMI_DIP_DATA: | |
55 | case AC_VERB_GET_HDMI_DIP_XMIT: | |
56 | case AC_VERB_GET_HDMI_CP_CTRL: | |
57 | case AC_VERB_GET_HDMI_CHAN_SLOT: | |
58 | case AC_VERB_GET_DEVICE_SEL: | |
59 | case AC_VERB_GET_DEVICE_LIST: /* read-only volatile */ | |
60 | return true; | |
61 | } | |
62 | ||
63 | return false; | |
64 | } | |
65 | ||
66 | static bool hda_writeable_reg(struct device *dev, unsigned int reg) | |
67 | { | |
faa75f8a | 68 | struct hdac_device *codec = dev_to_hdac_dev(dev); |
4d75faa0 | 69 | unsigned int verb = get_verb(reg); |
a9c2dfc8 | 70 | const unsigned int *v; |
5e56bcea TI |
71 | int i; |
72 | ||
a9c2dfc8 | 73 | snd_array_for_each(&codec->vendor_verbs, i, v) { |
5e56bcea TI |
74 | if (verb == *v) |
75 | return true; | |
76 | } | |
4d75faa0 | 77 | |
faa75f8a TI |
78 | if (codec->caps_overwriting) |
79 | return true; | |
80 | ||
4d75faa0 TI |
81 | switch (verb & 0xf00) { |
82 | case AC_VERB_GET_STREAM_FORMAT: | |
83 | case AC_VERB_GET_AMP_GAIN_MUTE: | |
84 | return true; | |
40ba66a7 TI |
85 | case AC_VERB_GET_PROC_COEF: |
86 | return codec->cache_coef; | |
4d75faa0 TI |
87 | case 0xf00: |
88 | break; | |
89 | default: | |
90 | return false; | |
91 | } | |
92 | ||
93 | switch (verb) { | |
94 | case AC_VERB_GET_CONNECT_SEL: | |
95 | case AC_VERB_GET_SDI_SELECT: | |
4d75faa0 TI |
96 | case AC_VERB_GET_PIN_WIDGET_CONTROL: |
97 | case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ | |
98 | case AC_VERB_GET_BEEP_CONTROL: | |
99 | case AC_VERB_GET_EAPD_BTLENABLE: | |
100 | case AC_VERB_GET_DIGI_CONVERT_1: | |
101 | case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ | |
102 | case AC_VERB_GET_VOLUME_KNOB_CONTROL: | |
4d75faa0 TI |
103 | case AC_VERB_GET_GPIO_MASK: |
104 | case AC_VERB_GET_GPIO_DIRECTION: | |
105 | case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ | |
106 | case AC_VERB_GET_GPIO_WAKE_MASK: | |
107 | case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: | |
108 | case AC_VERB_GET_GPIO_STICKY_MASK: | |
4d75faa0 TI |
109 | return true; |
110 | } | |
111 | ||
112 | return false; | |
113 | } | |
114 | ||
115 | static bool hda_readable_reg(struct device *dev, unsigned int reg) | |
116 | { | |
faa75f8a | 117 | struct hdac_device *codec = dev_to_hdac_dev(dev); |
4d75faa0 TI |
118 | unsigned int verb = get_verb(reg); |
119 | ||
faa75f8a TI |
120 | if (codec->caps_overwriting) |
121 | return true; | |
122 | ||
4d75faa0 TI |
123 | switch (verb) { |
124 | case AC_VERB_PARAMETERS: | |
125 | case AC_VERB_GET_CONNECT_LIST: | |
126 | case AC_VERB_GET_SUBSYSTEM_ID: | |
127 | return true; | |
8bc174e9 TI |
128 | /* below are basically writable, but disabled for reducing unnecessary |
129 | * writes at sync | |
130 | */ | |
131 | case AC_VERB_GET_CONFIG_DEFAULT: /* usually just read */ | |
132 | case AC_VERB_GET_CONV: /* managed in PCM code */ | |
133 | case AC_VERB_GET_CVT_CHAN_COUNT: /* managed in HDMI CA code */ | |
134 | return true; | |
4d75faa0 TI |
135 | } |
136 | ||
137 | return hda_writeable_reg(dev, reg); | |
138 | } | |
139 | ||
d313e0a8 TI |
140 | /* |
141 | * Stereo amp pseudo register: | |
142 | * for making easier to handle the stereo volume control, we provide a | |
143 | * fake register to deal both left and right channels by a single | |
144 | * (pseudo) register access. A verb consisting of SET_AMP_GAIN with | |
145 | * *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit | |
146 | * for the left and the upper 8bit for the right channel. | |
147 | */ | |
148 | static bool is_stereo_amp_verb(unsigned int reg) | |
149 | { | |
150 | if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE) | |
151 | return false; | |
152 | return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) == | |
153 | (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); | |
154 | } | |
155 | ||
156 | /* read a pseudo stereo amp register (16bit left+right) */ | |
157 | static int hda_reg_read_stereo_amp(struct hdac_device *codec, | |
158 | unsigned int reg, unsigned int *val) | |
159 | { | |
160 | unsigned int left, right; | |
161 | int err; | |
162 | ||
163 | reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); | |
164 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left); | |
165 | if (err < 0) | |
166 | return err; | |
167 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right); | |
168 | if (err < 0) | |
169 | return err; | |
170 | *val = left | (right << 8); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* write a pseudo stereo amp register (16bit left+right) */ | |
175 | static int hda_reg_write_stereo_amp(struct hdac_device *codec, | |
176 | unsigned int reg, unsigned int val) | |
177 | { | |
178 | int err; | |
179 | unsigned int verb, left, right; | |
180 | ||
181 | verb = AC_VERB_SET_AMP_GAIN_MUTE << 8; | |
182 | if (reg & AC_AMP_GET_OUTPUT) | |
183 | verb |= AC_AMP_SET_OUTPUT; | |
184 | else | |
185 | verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8); | |
186 | reg = (reg & ~0xfffff) | verb; | |
187 | ||
188 | left = val & 0xff; | |
189 | right = (val >> 8) & 0xff; | |
190 | if (left == right) { | |
191 | reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT; | |
192 | return snd_hdac_exec_verb(codec, reg | left, 0, NULL); | |
193 | } | |
194 | ||
195 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL); | |
196 | if (err < 0) | |
197 | return err; | |
198 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL); | |
199 | if (err < 0) | |
200 | return err; | |
201 | return 0; | |
202 | } | |
203 | ||
40ba66a7 TI |
204 | /* read a pseudo coef register (16bit) */ |
205 | static int hda_reg_read_coef(struct hdac_device *codec, unsigned int reg, | |
206 | unsigned int *val) | |
207 | { | |
208 | unsigned int verb; | |
209 | int err; | |
210 | ||
211 | if (!codec->cache_coef) | |
212 | return -EINVAL; | |
213 | /* LSB 8bit = coef index */ | |
214 | verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); | |
215 | err = snd_hdac_exec_verb(codec, verb, 0, NULL); | |
216 | if (err < 0) | |
217 | return err; | |
218 | verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8); | |
219 | return snd_hdac_exec_verb(codec, verb, 0, val); | |
220 | } | |
221 | ||
222 | /* write a pseudo coef register (16bit) */ | |
223 | static int hda_reg_write_coef(struct hdac_device *codec, unsigned int reg, | |
224 | unsigned int val) | |
225 | { | |
226 | unsigned int verb; | |
227 | int err; | |
228 | ||
229 | if (!codec->cache_coef) | |
230 | return -EINVAL; | |
231 | /* LSB 8bit = coef index */ | |
232 | verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); | |
233 | err = snd_hdac_exec_verb(codec, verb, 0, NULL); | |
234 | if (err < 0) | |
235 | return err; | |
236 | verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) | | |
237 | (val & 0xffff); | |
238 | return snd_hdac_exec_verb(codec, verb, 0, NULL); | |
239 | } | |
240 | ||
4d75faa0 TI |
241 | static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) |
242 | { | |
243 | struct hdac_device *codec = context; | |
40ba66a7 | 244 | int verb = get_verb(reg); |
33f81940 | 245 | int err; |
fc4f000b | 246 | int pm_lock = 0; |
4d75faa0 | 247 | |
fc4f000b TI |
248 | if (verb != AC_VERB_GET_POWER_STATE) { |
249 | pm_lock = codec_pm_lock(codec); | |
250 | if (pm_lock < 0) | |
251 | return -EAGAIN; | |
252 | } | |
4d75faa0 | 253 | reg |= (codec->addr << 28); |
fc4f000b TI |
254 | if (is_stereo_amp_verb(reg)) { |
255 | err = hda_reg_read_stereo_amp(codec, reg, val); | |
256 | goto out; | |
257 | } | |
258 | if (verb == AC_VERB_GET_PROC_COEF) { | |
259 | err = hda_reg_read_coef(codec, reg, val); | |
260 | goto out; | |
261 | } | |
a686ec4c TI |
262 | if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE) |
263 | reg &= ~AC_AMP_FAKE_MUTE; | |
264 | ||
33f81940 TI |
265 | err = snd_hdac_exec_verb(codec, reg, 0, val); |
266 | if (err < 0) | |
fc4f000b | 267 | goto out; |
33f81940 | 268 | /* special handling for asymmetric reads */ |
40ba66a7 | 269 | if (verb == AC_VERB_GET_POWER_STATE) { |
33f81940 TI |
270 | if (*val & AC_PWRST_ERROR) |
271 | *val = -1; | |
272 | else /* take only the actual state */ | |
273 | *val = (*val >> 4) & 0x0f; | |
274 | } | |
fc4f000b TI |
275 | out: |
276 | codec_pm_unlock(codec, pm_lock); | |
277 | return err; | |
4d75faa0 TI |
278 | } |
279 | ||
280 | static int hda_reg_write(void *context, unsigned int reg, unsigned int val) | |
281 | { | |
282 | struct hdac_device *codec = context; | |
283 | unsigned int verb; | |
284 | int i, bytes, err; | |
fc4f000b | 285 | int pm_lock = 0; |
4d75faa0 | 286 | |
98a226ed TI |
287 | if (codec->caps_overwriting) |
288 | return 0; | |
289 | ||
4d75faa0 TI |
290 | reg &= ~0x00080000U; /* drop GET bit */ |
291 | reg |= (codec->addr << 28); | |
9efe2731 TI |
292 | verb = get_verb(reg); |
293 | ||
fc4f000b TI |
294 | if (verb != AC_VERB_SET_POWER_STATE) { |
295 | pm_lock = codec_pm_lock(codec); | |
296 | if (pm_lock < 0) | |
297 | return codec->lazy_cache ? 0 : -EAGAIN; | |
298 | } | |
4d75faa0 | 299 | |
fc4f000b TI |
300 | if (is_stereo_amp_verb(reg)) { |
301 | err = hda_reg_write_stereo_amp(codec, reg, val); | |
302 | goto out; | |
303 | } | |
d313e0a8 | 304 | |
fc4f000b TI |
305 | if (verb == AC_VERB_SET_PROC_COEF) { |
306 | err = hda_reg_write_coef(codec, reg, val); | |
307 | goto out; | |
308 | } | |
40ba66a7 | 309 | |
4d75faa0 TI |
310 | switch (verb & 0xf00) { |
311 | case AC_VERB_SET_AMP_GAIN_MUTE: | |
a686ec4c TI |
312 | if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE)) |
313 | val = 0; | |
4d75faa0 TI |
314 | verb = AC_VERB_SET_AMP_GAIN_MUTE; |
315 | if (reg & AC_AMP_GET_LEFT) | |
316 | verb |= AC_AMP_SET_LEFT >> 8; | |
317 | else | |
318 | verb |= AC_AMP_SET_RIGHT >> 8; | |
319 | if (reg & AC_AMP_GET_OUTPUT) { | |
320 | verb |= AC_AMP_SET_OUTPUT >> 8; | |
321 | } else { | |
322 | verb |= AC_AMP_SET_INPUT >> 8; | |
323 | verb |= reg & 0xf; | |
324 | } | |
325 | break; | |
326 | } | |
327 | ||
328 | switch (verb) { | |
329 | case AC_VERB_SET_DIGI_CONVERT_1: | |
330 | bytes = 2; | |
331 | break; | |
332 | case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: | |
333 | bytes = 4; | |
334 | break; | |
335 | default: | |
336 | bytes = 1; | |
337 | break; | |
338 | } | |
339 | ||
340 | for (i = 0; i < bytes; i++) { | |
341 | reg &= ~0xfffff; | |
342 | reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); | |
343 | err = snd_hdac_exec_verb(codec, reg, 0, NULL); | |
344 | if (err < 0) | |
fc4f000b | 345 | goto out; |
4d75faa0 TI |
346 | } |
347 | ||
fc4f000b TI |
348 | out: |
349 | codec_pm_unlock(codec, pm_lock); | |
350 | return err; | |
4d75faa0 TI |
351 | } |
352 | ||
353 | static const struct regmap_config hda_regmap_cfg = { | |
354 | .name = "hdaudio", | |
355 | .reg_bits = 32, | |
356 | .val_bits = 32, | |
357 | .max_register = 0xfffffff, | |
358 | .writeable_reg = hda_writeable_reg, | |
359 | .readable_reg = hda_readable_reg, | |
360 | .volatile_reg = hda_volatile_reg, | |
361 | .cache_type = REGCACHE_RBTREE, | |
362 | .reg_read = hda_reg_read, | |
363 | .reg_write = hda_reg_write, | |
1c96a2f6 DF |
364 | .use_single_read = true, |
365 | .use_single_write = true, | |
4d75faa0 TI |
366 | }; |
367 | ||
78dd5e21 TI |
368 | /** |
369 | * snd_hdac_regmap_init - Initialize regmap for HDA register accesses | |
370 | * @codec: the codec object | |
371 | * | |
372 | * Returns zero for success or a negative error code. | |
373 | */ | |
4d75faa0 TI |
374 | int snd_hdac_regmap_init(struct hdac_device *codec) |
375 | { | |
376 | struct regmap *regmap; | |
377 | ||
378 | regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); | |
379 | if (IS_ERR(regmap)) | |
380 | return PTR_ERR(regmap); | |
381 | codec->regmap = regmap; | |
5e56bcea | 382 | snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); |
4d75faa0 TI |
383 | return 0; |
384 | } | |
385 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); | |
386 | ||
78dd5e21 TI |
387 | /** |
388 | * snd_hdac_regmap_init - Release the regmap from HDA codec | |
389 | * @codec: the codec object | |
390 | */ | |
4d75faa0 TI |
391 | void snd_hdac_regmap_exit(struct hdac_device *codec) |
392 | { | |
393 | if (codec->regmap) { | |
394 | regmap_exit(codec->regmap); | |
395 | codec->regmap = NULL; | |
5e56bcea | 396 | snd_array_free(&codec->vendor_verbs); |
4d75faa0 TI |
397 | } |
398 | } | |
399 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); | |
400 | ||
5e56bcea TI |
401 | /** |
402 | * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap | |
403 | * @codec: the codec object | |
404 | * @verb: verb to allow accessing via regmap | |
405 | * | |
406 | * Returns zero for success or a negative error code. | |
407 | */ | |
408 | int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, | |
409 | unsigned int verb) | |
410 | { | |
411 | unsigned int *p = snd_array_new(&codec->vendor_verbs); | |
412 | ||
413 | if (!p) | |
414 | return -ENOMEM; | |
d6eb9e3e | 415 | *p = verb | 0x800; /* set GET bit */ |
5e56bcea TI |
416 | return 0; |
417 | } | |
418 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); | |
419 | ||
4d75faa0 TI |
420 | /* |
421 | * helper functions | |
422 | */ | |
423 | ||
424 | /* write a pseudo-register value (w/o power sequence) */ | |
425 | static int reg_raw_write(struct hdac_device *codec, unsigned int reg, | |
426 | unsigned int val) | |
427 | { | |
428 | if (!codec->regmap) | |
429 | return hda_reg_write(codec, reg, val); | |
430 | else | |
431 | return regmap_write(codec->regmap, reg, val); | |
432 | } | |
433 | ||
434 | /** | |
435 | * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt | |
436 | * @codec: the codec object | |
437 | * @reg: pseudo register | |
438 | * @val: value to write | |
439 | * | |
440 | * Returns zero if successful or a negative error code. | |
441 | */ | |
442 | int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, | |
443 | unsigned int val) | |
444 | { | |
445 | int err; | |
446 | ||
447 | err = reg_raw_write(codec, reg, val); | |
448 | if (err == -EAGAIN) { | |
fbce23a0 | 449 | err = snd_hdac_power_up_pm(codec); |
8198868f | 450 | if (err >= 0) |
fbce23a0 | 451 | err = reg_raw_write(codec, reg, val); |
664c7155 | 452 | snd_hdac_power_down_pm(codec); |
4d75faa0 TI |
453 | } |
454 | return err; | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); | |
457 | ||
458 | static int reg_raw_read(struct hdac_device *codec, unsigned int reg, | |
3194ed49 | 459 | unsigned int *val, bool uncached) |
4d75faa0 | 460 | { |
3194ed49 | 461 | if (uncached || !codec->regmap) |
4d75faa0 TI |
462 | return hda_reg_read(codec, reg, val); |
463 | else | |
464 | return regmap_read(codec->regmap, reg, val); | |
465 | } | |
466 | ||
3194ed49 TI |
467 | static int __snd_hdac_regmap_read_raw(struct hdac_device *codec, |
468 | unsigned int reg, unsigned int *val, | |
469 | bool uncached) | |
470 | { | |
471 | int err; | |
472 | ||
473 | err = reg_raw_read(codec, reg, val, uncached); | |
474 | if (err == -EAGAIN) { | |
475 | err = snd_hdac_power_up_pm(codec); | |
8198868f | 476 | if (err >= 0) |
3194ed49 TI |
477 | err = reg_raw_read(codec, reg, val, uncached); |
478 | snd_hdac_power_down_pm(codec); | |
479 | } | |
480 | return err; | |
481 | } | |
482 | ||
4d75faa0 TI |
483 | /** |
484 | * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt | |
485 | * @codec: the codec object | |
486 | * @reg: pseudo register | |
487 | * @val: pointer to store the read value | |
488 | * | |
489 | * Returns zero if successful or a negative error code. | |
490 | */ | |
491 | int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, | |
492 | unsigned int *val) | |
493 | { | |
3194ed49 | 494 | return __snd_hdac_regmap_read_raw(codec, reg, val, false); |
4d75faa0 TI |
495 | } |
496 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); | |
497 | ||
3194ed49 TI |
498 | /* Works like snd_hdac_regmap_read_raw(), but this doesn't read from the |
499 | * cache but always via hda verbs. | |
500 | */ | |
501 | int snd_hdac_regmap_read_raw_uncached(struct hdac_device *codec, | |
502 | unsigned int reg, unsigned int *val) | |
503 | { | |
504 | return __snd_hdac_regmap_read_raw(codec, reg, val, true); | |
505 | } | |
506 | ||
4d75faa0 TI |
507 | /** |
508 | * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt | |
509 | * @codec: the codec object | |
510 | * @reg: pseudo register | |
511 | * @mask: bit mask to udpate | |
512 | * @val: value to update | |
513 | * | |
514 | * Returns zero if successful or a negative error code. | |
515 | */ | |
516 | int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, | |
517 | unsigned int mask, unsigned int val) | |
518 | { | |
519 | unsigned int orig; | |
520 | int err; | |
521 | ||
522 | val &= mask; | |
523 | err = snd_hdac_regmap_read_raw(codec, reg, &orig); | |
524 | if (err < 0) | |
525 | return err; | |
526 | val |= orig & ~mask; | |
527 | if (val == orig) | |
528 | return 0; | |
529 | err = snd_hdac_regmap_write_raw(codec, reg, val); | |
530 | if (err < 0) | |
531 | return err; | |
532 | return 1; | |
533 | } | |
534 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |