1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * wm8731.c  --  WM8731 ALSA SoC Audio driver
4  *
5  * Copyright 2005 Openedhand Ltd.
6  * Copyright 2006-12 Wolfson Microelectronics, plc
7  *
8  * Author: Richard Purdie <richard@openedhand.com>
9  *
10  * Based on wm8753.c by Liam Girdwood
11  */
12 
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/pm.h>
18 #include <linux/slab.h>
19 #include <linux/regmap.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/clk.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/initval.h>
27 #include <sound/tlv.h>
28 
29 #include "wm8731.h"
30 
31 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
32 	"AVDD",
33 	"HPVDD",
34 	"DCVDD",
35 	"DBVDD",
36 };
37 
38 /*
39  * wm8731 register cache
40  */
41 static const struct reg_default wm8731_reg_defaults[] = {
42 	{ 0, 0x0097 },
43 	{ 1, 0x0097 },
44 	{ 2, 0x0079 },
45 	{ 3, 0x0079 },
46 	{ 4, 0x000a },
47 	{ 5, 0x0008 },
48 	{ 6, 0x009f },
49 	{ 7, 0x000a },
50 	{ 8, 0x0000 },
51 	{ 9, 0x0000 },
52 };
53 
wm8731_volatile(struct device * dev,unsigned int reg)54 static bool wm8731_volatile(struct device *dev, unsigned int reg)
55 {
56 	return reg == WM8731_RESET;
57 }
58 
59 #define wm8731_reset(m)	regmap_write(m, WM8731_RESET, 0)
60 
61 static const char *wm8731_input_select[] = {"Line In", "Mic"};
62 
63 static SOC_ENUM_SINGLE_DECL(wm8731_insel_enum,
64 			    WM8731_APANA, 2, wm8731_input_select);
65 
66 static int wm8731_deemph[] = { 0, 32000, 44100, 48000 };
67 
wm8731_set_deemph(struct snd_soc_component * component)68 static int wm8731_set_deemph(struct snd_soc_component *component)
69 {
70 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
71 	int val, i, best;
72 
73 	/* If we're using deemphasis select the nearest available sample
74 	 * rate.
75 	 */
76 	if (wm8731->deemph) {
77 		best = 1;
78 		for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) {
79 			if (abs(wm8731_deemph[i] - wm8731->playback_fs) <
80 			    abs(wm8731_deemph[best] - wm8731->playback_fs))
81 				best = i;
82 		}
83 
84 		val = best << 1;
85 	} else {
86 		best = 0;
87 		val = 0;
88 	}
89 
90 	dev_dbg(component->dev, "Set deemphasis %d (%dHz)\n",
91 		best, wm8731_deemph[best]);
92 
93 	return snd_soc_component_update_bits(component, WM8731_APDIGI, 0x6, val);
94 }
95 
wm8731_get_deemph(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)96 static int wm8731_get_deemph(struct snd_kcontrol *kcontrol,
97 			     struct snd_ctl_elem_value *ucontrol)
98 {
99 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
100 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
101 
102 	ucontrol->value.integer.value[0] = wm8731->deemph;
103 
104 	return 0;
105 }
106 
wm8731_put_deemph(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)107 static int wm8731_put_deemph(struct snd_kcontrol *kcontrol,
108 			     struct snd_ctl_elem_value *ucontrol)
109 {
110 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
111 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
112 	unsigned int deemph = ucontrol->value.integer.value[0];
113 	int ret = 0;
114 
115 	if (deemph > 1)
116 		return -EINVAL;
117 
118 	mutex_lock(&wm8731->lock);
119 	if (wm8731->deemph != deemph) {
120 		wm8731->deemph = deemph;
121 
122 		wm8731_set_deemph(component);
123 
124 		ret = 1;
125 	}
126 	mutex_unlock(&wm8731->lock);
127 
128 	return ret;
129 }
130 
131 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
132 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
133 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
134 static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0);
135 
136 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
137 
138 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
139 		 0, 127, 0, out_tlv),
140 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
141 	7, 1, 0),
142 
143 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
144 		 in_tlv),
145 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
146 
147 SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv),
148 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
149 
150 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
151 	       sidetone_tlv),
152 
153 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
154 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
155 
156 SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
157 		    wm8731_get_deemph, wm8731_put_deemph),
158 };
159 
160 /* Output Mixer */
161 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
162 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
163 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
164 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
165 };
166 
167 /* Input mux */
168 static const struct snd_kcontrol_new wm8731_input_mux_controls =
169 SOC_DAPM_ENUM("Input Select", wm8731_insel_enum);
170 
171 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
172 SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0),
173 SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
174 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
175 	&wm8731_output_mixer_controls[0],
176 	ARRAY_SIZE(wm8731_output_mixer_controls)),
177 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
178 SND_SOC_DAPM_OUTPUT("LOUT"),
179 SND_SOC_DAPM_OUTPUT("LHPOUT"),
180 SND_SOC_DAPM_OUTPUT("ROUT"),
181 SND_SOC_DAPM_OUTPUT("RHPOUT"),
182 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
183 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
184 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
185 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
186 SND_SOC_DAPM_INPUT("MICIN"),
187 SND_SOC_DAPM_INPUT("RLINEIN"),
188 SND_SOC_DAPM_INPUT("LLINEIN"),
189 };
190 
wm8731_check_osc(struct snd_soc_dapm_widget * source,struct snd_soc_dapm_widget * sink)191 static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
192 			    struct snd_soc_dapm_widget *sink)
193 {
194 	struct snd_soc_component *component = snd_soc_dapm_to_component(source->dapm);
195 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
196 
197 	return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
198 }
199 
200 static const struct snd_soc_dapm_route wm8731_intercon[] = {
201 	{"DAC", NULL, "OSC", wm8731_check_osc},
202 	{"ADC", NULL, "OSC", wm8731_check_osc},
203 	{"DAC", NULL, "ACTIVE"},
204 	{"ADC", NULL, "ACTIVE"},
205 
206 	/* output mixer */
207 	{"Output Mixer", "Line Bypass Switch", "Line Input"},
208 	{"Output Mixer", "HiFi Playback Switch", "DAC"},
209 	{"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
210 
211 	/* outputs */
212 	{"RHPOUT", NULL, "Output Mixer"},
213 	{"ROUT", NULL, "Output Mixer"},
214 	{"LHPOUT", NULL, "Output Mixer"},
215 	{"LOUT", NULL, "Output Mixer"},
216 
217 	/* input mux */
218 	{"Input Mux", "Line In", "Line Input"},
219 	{"Input Mux", "Mic", "Mic Bias"},
220 	{"ADC", NULL, "Input Mux"},
221 
222 	/* inputs */
223 	{"Line Input", NULL, "LLINEIN"},
224 	{"Line Input", NULL, "RLINEIN"},
225 	{"Mic Bias", NULL, "MICIN"},
226 };
227 
228 struct _coeff_div {
229 	u32 mclk;
230 	u32 rate;
231 	u16 fs;
232 	u8 sr:4;
233 	u8 bosr:1;
234 	u8 usb:1;
235 };
236 
237 /* codec mclk clock divider coefficients */
238 static const struct _coeff_div coeff_div[] = {
239 	/* 48k */
240 	{12288000, 48000, 256, 0x0, 0x0, 0x0},
241 	{18432000, 48000, 384, 0x0, 0x1, 0x0},
242 	{12000000, 48000, 250, 0x0, 0x0, 0x1},
243 
244 	/* 32k */
245 	{12288000, 32000, 384, 0x6, 0x0, 0x0},
246 	{18432000, 32000, 576, 0x6, 0x1, 0x0},
247 	{12000000, 32000, 375, 0x6, 0x0, 0x1},
248 
249 	/* 8k */
250 	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
251 	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
252 	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
253 	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
254 	{12000000, 8000, 1500, 0x3, 0x0, 0x1},
255 
256 	/* 96k */
257 	{12288000, 96000, 128, 0x7, 0x0, 0x0},
258 	{18432000, 96000, 192, 0x7, 0x1, 0x0},
259 	{12000000, 96000, 125, 0x7, 0x0, 0x1},
260 
261 	/* 44.1k */
262 	{11289600, 44100, 256, 0x8, 0x0, 0x0},
263 	{16934400, 44100, 384, 0x8, 0x1, 0x0},
264 	{12000000, 44100, 272, 0x8, 0x1, 0x1},
265 
266 	/* 88.2k */
267 	{11289600, 88200, 128, 0xf, 0x0, 0x0},
268 	{16934400, 88200, 192, 0xf, 0x1, 0x0},
269 	{12000000, 88200, 136, 0xf, 0x1, 0x1},
270 };
271 
272 /* rates constraints */
273 static const unsigned int wm8731_rates_12000000[] = {
274 	8000, 32000, 44100, 48000, 96000, 88200,
275 };
276 
277 static const unsigned int wm8731_rates_12288000_18432000[] = {
278 	8000, 32000, 48000, 96000,
279 };
280 
281 static const unsigned int wm8731_rates_11289600_16934400[] = {
282 	8000, 44100, 88200,
283 };
284 
285 static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = {
286 	.list = wm8731_rates_12000000,
287 	.count = ARRAY_SIZE(wm8731_rates_12000000),
288 };
289 
290 static const
291 struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = {
292 	.list = wm8731_rates_12288000_18432000,
293 	.count = ARRAY_SIZE(wm8731_rates_12288000_18432000),
294 };
295 
296 static const
297 struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = {
298 	.list = wm8731_rates_11289600_16934400,
299 	.count = ARRAY_SIZE(wm8731_rates_11289600_16934400),
300 };
301 
get_coeff(int mclk,int rate)302 static inline int get_coeff(int mclk, int rate)
303 {
304 	int i;
305 
306 	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
307 		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
308 			return i;
309 	}
310 	return 0;
311 }
312 
wm8731_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)313 static int wm8731_hw_params(struct snd_pcm_substream *substream,
314 			    struct snd_pcm_hw_params *params,
315 			    struct snd_soc_dai *dai)
316 {
317 	struct snd_soc_component *component = dai->component;
318 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
319 	u16 iface = snd_soc_component_read(component, WM8731_IFACE) & 0xfff3;
320 	int i = get_coeff(wm8731->sysclk, params_rate(params));
321 	u16 srate = (coeff_div[i].sr << 2) |
322 		(coeff_div[i].bosr << 1) | coeff_div[i].usb;
323 
324 	wm8731->playback_fs = params_rate(params);
325 
326 	snd_soc_component_write(component, WM8731_SRATE, srate);
327 
328 	/* bit size */
329 	switch (params_width(params)) {
330 	case 16:
331 		break;
332 	case 20:
333 		iface |= 0x0004;
334 		break;
335 	case 24:
336 		iface |= 0x0008;
337 		break;
338 	case 32:
339 		iface |= 0x000c;
340 		break;
341 	}
342 
343 	wm8731_set_deemph(component);
344 
345 	snd_soc_component_write(component, WM8731_IFACE, iface);
346 	return 0;
347 }
348 
wm8731_mute(struct snd_soc_dai * dai,int mute,int direction)349 static int wm8731_mute(struct snd_soc_dai *dai, int mute, int direction)
350 {
351 	struct snd_soc_component *component = dai->component;
352 	u16 mute_reg = snd_soc_component_read(component, WM8731_APDIGI) & 0xfff7;
353 
354 	if (mute)
355 		snd_soc_component_write(component, WM8731_APDIGI, mute_reg | 0x8);
356 	else
357 		snd_soc_component_write(component, WM8731_APDIGI, mute_reg);
358 	return 0;
359 }
360 
wm8731_set_dai_sysclk(struct snd_soc_dai * codec_dai,int clk_id,unsigned int freq,int dir)361 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
362 		int clk_id, unsigned int freq, int dir)
363 {
364 	struct snd_soc_component *component = codec_dai->component;
365 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
366 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
367 
368 	switch (clk_id) {
369 	case WM8731_SYSCLK_XTAL:
370 	case WM8731_SYSCLK_MCLK:
371 		if (wm8731->mclk && clk_set_rate(wm8731->mclk, freq))
372 			return -EINVAL;
373 		wm8731->sysclk_type = clk_id;
374 		break;
375 	default:
376 		return -EINVAL;
377 	}
378 
379 	switch (freq) {
380 	case 0:
381 		wm8731->constraints = NULL;
382 		break;
383 	case 12000000:
384 		wm8731->constraints = &wm8731_constraints_12000000;
385 		break;
386 	case 12288000:
387 	case 18432000:
388 		wm8731->constraints = &wm8731_constraints_12288000_18432000;
389 		break;
390 	case 16934400:
391 	case 11289600:
392 		wm8731->constraints = &wm8731_constraints_11289600_16934400;
393 		break;
394 	default:
395 		return -EINVAL;
396 	}
397 
398 	wm8731->sysclk = freq;
399 
400 	snd_soc_dapm_sync(dapm);
401 
402 	return 0;
403 }
404 
405 
wm8731_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)406 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
407 		unsigned int fmt)
408 {
409 	struct snd_soc_component *component = codec_dai->component;
410 	u16 iface = 0;
411 
412 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
413 	case SND_SOC_DAIFMT_CBP_CFP:
414 		iface |= 0x0040;
415 		break;
416 	case SND_SOC_DAIFMT_CBC_CFC:
417 		break;
418 	default:
419 		return -EINVAL;
420 	}
421 
422 	/* interface format */
423 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
424 	case SND_SOC_DAIFMT_I2S:
425 		iface |= 0x0002;
426 		break;
427 	case SND_SOC_DAIFMT_RIGHT_J:
428 		break;
429 	case SND_SOC_DAIFMT_LEFT_J:
430 		iface |= 0x0001;
431 		break;
432 	case SND_SOC_DAIFMT_DSP_A:
433 		iface |= 0x0013;
434 		break;
435 	case SND_SOC_DAIFMT_DSP_B:
436 		iface |= 0x0003;
437 		break;
438 	default:
439 		return -EINVAL;
440 	}
441 
442 	/* clock inversion */
443 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
444 	case SND_SOC_DAIFMT_NB_NF:
445 		break;
446 	case SND_SOC_DAIFMT_IB_IF:
447 		iface |= 0x0090;
448 		break;
449 	case SND_SOC_DAIFMT_IB_NF:
450 		iface |= 0x0080;
451 		break;
452 	case SND_SOC_DAIFMT_NB_IF:
453 		iface |= 0x0010;
454 		break;
455 	default:
456 		return -EINVAL;
457 	}
458 
459 	/* set iface */
460 	snd_soc_component_write(component, WM8731_IFACE, iface);
461 	return 0;
462 }
463 
wm8731_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)464 static int wm8731_set_bias_level(struct snd_soc_component *component,
465 				 enum snd_soc_bias_level level)
466 {
467 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(component);
468 	int ret;
469 	u16 reg;
470 
471 	switch (level) {
472 	case SND_SOC_BIAS_ON:
473 		if (wm8731->mclk) {
474 			ret = clk_prepare_enable(wm8731->mclk);
475 			if (ret)
476 				return ret;
477 		}
478 		break;
479 	case SND_SOC_BIAS_PREPARE:
480 		break;
481 	case SND_SOC_BIAS_STANDBY:
482 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
483 			ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
484 						    wm8731->supplies);
485 			if (ret != 0)
486 				return ret;
487 
488 			regcache_sync(wm8731->regmap);
489 		}
490 
491 		/* Clear PWROFF, gate CLKOUT, everything else as-is */
492 		reg = snd_soc_component_read(component, WM8731_PWR) & 0xff7f;
493 		snd_soc_component_write(component, WM8731_PWR, reg | 0x0040);
494 		break;
495 	case SND_SOC_BIAS_OFF:
496 		if (wm8731->mclk)
497 			clk_disable_unprepare(wm8731->mclk);
498 		snd_soc_component_write(component, WM8731_PWR, 0xffff);
499 		regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
500 				       wm8731->supplies);
501 		regcache_mark_dirty(wm8731->regmap);
502 		break;
503 	}
504 	return 0;
505 }
506 
wm8731_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)507 static int wm8731_startup(struct snd_pcm_substream *substream,
508 	struct snd_soc_dai *dai)
509 {
510 	struct wm8731_priv *wm8731 = snd_soc_component_get_drvdata(dai->component);
511 
512 	if (wm8731->constraints)
513 		snd_pcm_hw_constraint_list(substream->runtime, 0,
514 					   SNDRV_PCM_HW_PARAM_RATE,
515 					   wm8731->constraints);
516 
517 	return 0;
518 }
519 
520 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
521 
522 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
523 	SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
524 
525 static const struct snd_soc_dai_ops wm8731_dai_ops = {
526 	.startup	= wm8731_startup,
527 	.hw_params	= wm8731_hw_params,
528 	.mute_stream	= wm8731_mute,
529 	.set_sysclk	= wm8731_set_dai_sysclk,
530 	.set_fmt	= wm8731_set_dai_fmt,
531 	.no_capture_mute = 1,
532 };
533 
534 static struct snd_soc_dai_driver wm8731_dai = {
535 	.name = "wm8731-hifi",
536 	.playback = {
537 		.stream_name = "Playback",
538 		.channels_min = 1,
539 		.channels_max = 2,
540 		.rates = WM8731_RATES,
541 		.formats = WM8731_FORMATS,},
542 	.capture = {
543 		.stream_name = "Capture",
544 		.channels_min = 1,
545 		.channels_max = 2,
546 		.rates = WM8731_RATES,
547 		.formats = WM8731_FORMATS,},
548 	.ops = &wm8731_dai_ops,
549 	.symmetric_rate = 1,
550 };
551 
552 static const struct snd_soc_component_driver soc_component_dev_wm8731 = {
553 	.set_bias_level		= wm8731_set_bias_level,
554 	.controls		= wm8731_snd_controls,
555 	.num_controls		= ARRAY_SIZE(wm8731_snd_controls),
556 	.dapm_widgets		= wm8731_dapm_widgets,
557 	.num_dapm_widgets	= ARRAY_SIZE(wm8731_dapm_widgets),
558 	.dapm_routes		= wm8731_intercon,
559 	.num_dapm_routes	= ARRAY_SIZE(wm8731_intercon),
560 	.suspend_bias_off	= 1,
561 	.idle_bias_on		= 1,
562 	.use_pmdown_time	= 1,
563 	.endianness		= 1,
564 	.non_legacy_dai_naming	= 1,
565 };
566 
wm8731_init(struct device * dev,struct wm8731_priv * wm8731)567 int wm8731_init(struct device *dev, struct wm8731_priv *wm8731)
568 {
569 	int ret = 0, i;
570 
571 	wm8731->mclk = devm_clk_get(dev, "mclk");
572 	if (IS_ERR(wm8731->mclk)) {
573 		ret = PTR_ERR(wm8731->mclk);
574 		if (ret == -ENOENT) {
575 			wm8731->mclk = NULL;
576 			dev_warn(dev, "Assuming static MCLK\n");
577 		} else {
578 			dev_err(dev, "Failed to get MCLK: %d\n", ret);
579 			return ret;
580 		}
581 	}
582 
583 	mutex_init(&wm8731->lock);
584 
585 	for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
586 		wm8731->supplies[i].supply = wm8731_supply_names[i];
587 
588 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8731->supplies),
589 				 wm8731->supplies);
590 	if (ret != 0) {
591 		dev_err(dev, "Failed to request supplies: %d\n", ret);
592 		return ret;
593 	}
594 
595 	ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
596 				    wm8731->supplies);
597 	if (ret != 0) {
598 		dev_err(dev, "Failed to enable supplies: %d\n", ret);
599 		return ret;
600 	}
601 
602 	ret = wm8731_reset(wm8731->regmap);
603 	if (ret < 0) {
604 		dev_err(dev, "Failed to issue reset: %d\n", ret);
605 		goto err_regulator_enable;
606 	}
607 
608 	/* Clear POWEROFF, keep everything else disabled */
609 	regmap_write(wm8731->regmap, WM8731_PWR, 0x7f);
610 
611 	/* Latch the update bits */
612 	regmap_update_bits(wm8731->regmap, WM8731_LOUT1V, 0x100, 0);
613 	regmap_update_bits(wm8731->regmap, WM8731_ROUT1V, 0x100, 0);
614 	regmap_update_bits(wm8731->regmap, WM8731_LINVOL, 0x100, 0);
615 	regmap_update_bits(wm8731->regmap, WM8731_RINVOL, 0x100, 0);
616 
617 	/* Disable bypass path by default */
618 	regmap_update_bits(wm8731->regmap, WM8731_APANA, 0x8, 0);
619 
620 	regcache_mark_dirty(wm8731->regmap);
621 
622 	ret = devm_snd_soc_register_component(dev,
623 			&soc_component_dev_wm8731, &wm8731_dai, 1);
624 	if (ret != 0) {
625 		dev_err(dev, "Failed to register CODEC: %d\n", ret);
626 		goto err_regulator_enable;
627 	}
628 
629 	return 0;
630 
631 err_regulator_enable:
632 	/* Regulators will be enabled by bias management */
633 	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
634 
635 	return ret;
636 }
637 EXPORT_SYMBOL_GPL(wm8731_init);
638 
639 const struct regmap_config wm8731_regmap = {
640 	.reg_bits = 7,
641 	.val_bits = 9,
642 
643 	.max_register = WM8731_RESET,
644 	.volatile_reg = wm8731_volatile,
645 
646 	.cache_type = REGCACHE_RBTREE,
647 	.reg_defaults = wm8731_reg_defaults,
648 	.num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults),
649 };
650 EXPORT_SYMBOL_GPL(wm8731_regmap);
651 
652 MODULE_DESCRIPTION("ASoC WM8731 driver");
653 MODULE_AUTHOR("Richard Purdie");
654 MODULE_LICENSE("GPL");
655