2 * wm8974.c -- WM8974 ALSA Soc Audio driver
4 * Copyright 2006-2009 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood <linux@wolfsonmicro.com>
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.
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
19 #include <linux/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.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/soc-dapm.h>
27 #include <sound/initval.h>
28 #include <sound/tlv.h>
32 static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
33 0x0000, 0x0000, 0x0000, 0x0000,
34 0x0050, 0x0000, 0x0140, 0x0000,
35 0x0000, 0x0000, 0x0000, 0x00ff,
36 0x0000, 0x0000, 0x0100, 0x00ff,
37 0x0000, 0x0000, 0x012c, 0x002c,
38 0x002c, 0x002c, 0x002c, 0x0000,
39 0x0032, 0x0000, 0x0000, 0x0000,
40 0x0000, 0x0000, 0x0000, 0x0000,
41 0x0038, 0x000b, 0x0032, 0x0000,
42 0x0008, 0x000c, 0x0093, 0x00e9,
43 0x0000, 0x0000, 0x0000, 0x0000,
44 0x0003, 0x0010, 0x0000, 0x0000,
45 0x0000, 0x0002, 0x0000, 0x0000,
46 0x0000, 0x0000, 0x0039, 0x0000,
50 #define WM8974_POWER1_BIASEN 0x08
51 #define WM8974_POWER1_BUFIOEN 0x04
54 enum snd_soc_control_type control_type;
55 u16 reg_cache[WM8974_CACHEREGNUM];
58 #define wm8974_reset(c) snd_soc_write(c, WM8974_RESET, 0)
60 static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
61 static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
62 static const char *wm8974_eqmode[] = {"Capture", "Playback" };
63 static const char *wm8974_bw[] = {"Narrow", "Wide" };
64 static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
65 static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
66 static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
67 static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
68 static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
69 static const char *wm8974_alc[] = {"ALC", "Limiter" };
71 static const struct soc_enum wm8974_enum[] = {
72 SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
73 SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
74 SOC_ENUM_SINGLE(WM8974_DAC, 4, 4, wm8974_deemp),
75 SOC_ENUM_SINGLE(WM8974_EQ1, 8, 2, wm8974_eqmode),
77 SOC_ENUM_SINGLE(WM8974_EQ1, 5, 4, wm8974_eq1),
78 SOC_ENUM_SINGLE(WM8974_EQ2, 8, 2, wm8974_bw),
79 SOC_ENUM_SINGLE(WM8974_EQ2, 5, 4, wm8974_eq2),
80 SOC_ENUM_SINGLE(WM8974_EQ3, 8, 2, wm8974_bw),
82 SOC_ENUM_SINGLE(WM8974_EQ3, 5, 4, wm8974_eq3),
83 SOC_ENUM_SINGLE(WM8974_EQ4, 8, 2, wm8974_bw),
84 SOC_ENUM_SINGLE(WM8974_EQ4, 5, 4, wm8974_eq4),
85 SOC_ENUM_SINGLE(WM8974_EQ5, 8, 2, wm8974_bw),
87 SOC_ENUM_SINGLE(WM8974_EQ5, 5, 4, wm8974_eq5),
88 SOC_ENUM_SINGLE(WM8974_ALC3, 8, 2, wm8974_alc),
91 static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };
93 static const struct soc_enum wm8974_auxmode =
94 SOC_ENUM_SINGLE(WM8974_INPUT, 3, 2, wm8974_auxmode_text);
96 static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
97 static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
98 static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
99 static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
101 static const struct snd_kcontrol_new wm8974_snd_controls[] = {
103 SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),
105 SOC_ENUM("DAC Companding", wm8974_enum[1]),
106 SOC_ENUM("ADC Companding", wm8974_enum[0]),
108 SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
109 SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),
111 SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),
113 SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
114 SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
115 SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),
117 SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL, 0, 255, 0, digital_tlv),
119 SOC_ENUM("Equaliser Function", wm8974_enum[3]),
120 SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
121 SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1, 0, 24, 1, eq_tlv),
123 SOC_ENUM("Equaliser EQ2 Bandwith", wm8974_enum[5]),
124 SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
125 SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2, 0, 24, 1, eq_tlv),
127 SOC_ENUM("Equaliser EQ3 Bandwith", wm8974_enum[7]),
128 SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
129 SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3, 0, 24, 1, eq_tlv),
131 SOC_ENUM("Equaliser EQ4 Bandwith", wm8974_enum[9]),
132 SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
133 SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4, 0, 24, 1, eq_tlv),
135 SOC_ENUM("Equaliser EQ5 Bandwith", wm8974_enum[11]),
136 SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
137 SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5, 0, 24, 1, eq_tlv),
139 SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1, 8, 1, 0),
140 SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1, 4, 15, 0),
141 SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1, 0, 15, 0),
143 SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2, 4, 7, 0),
144 SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2, 0, 15, 0),
146 SOC_SINGLE("ALC Enable Switch", WM8974_ALC1, 8, 1, 0),
147 SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1, 3, 7, 0),
148 SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1, 0, 7, 0),
150 SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2, 8, 1, 0),
151 SOC_SINGLE("ALC Capture Hold", WM8974_ALC2, 4, 7, 0),
152 SOC_SINGLE("ALC Capture Target", WM8974_ALC2, 0, 15, 0),
154 SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
155 SOC_SINGLE("ALC Capture Decay", WM8974_ALC3, 4, 15, 0),
156 SOC_SINGLE("ALC Capture Attack", WM8974_ALC3, 0, 15, 0),
158 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE, 3, 1, 0),
159 SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE, 0, 7, 0),
161 SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA, 7, 1, 0),
162 SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA, 0, 63, 0, inpga_tlv),
164 SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL, 7, 1, 0),
165 SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL, 6, 1, 1),
166 SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL, 0, 63, 0, spk_tlv),
168 SOC_ENUM("Aux Mode", wm8974_auxmode),
170 SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST, 8, 1, 0),
171 SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),
173 /* DAC / ADC oversampling */
174 SOC_SINGLE("DAC 128x Oversampling Switch", WM8974_DAC, 8, 1, 0),
175 SOC_SINGLE("ADC 128x Oversampling Switch", WM8974_ADC, 8, 1, 0),
178 /* Speaker Output Mixer */
179 static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
180 SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
181 SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
182 SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 0),
185 /* Mono Output Mixer */
186 static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
187 SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
188 SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
189 SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
193 static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
194 SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
198 static const struct snd_kcontrol_new wm8974_inpga[] = {
199 SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
200 SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
201 SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
204 /* AUX Input boost vol */
205 static const struct snd_kcontrol_new wm8974_aux_boost_controls =
206 SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);
208 /* Mic Input boost vol */
209 static const struct snd_kcontrol_new wm8974_mic_boost_controls =
210 SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);
212 static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
213 SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
214 &wm8974_speaker_mixer_controls[0],
215 ARRAY_SIZE(wm8974_speaker_mixer_controls)),
216 SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
217 &wm8974_mono_mixer_controls[0],
218 ARRAY_SIZE(wm8974_mono_mixer_controls)),
219 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
220 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
221 SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
222 SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
223 SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
224 SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),
226 SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
227 ARRAY_SIZE(wm8974_inpga)),
228 SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
229 wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),
231 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),
233 SND_SOC_DAPM_INPUT("MICN"),
234 SND_SOC_DAPM_INPUT("MICP"),
235 SND_SOC_DAPM_INPUT("AUX"),
236 SND_SOC_DAPM_OUTPUT("MONOOUT"),
237 SND_SOC_DAPM_OUTPUT("SPKOUTP"),
238 SND_SOC_DAPM_OUTPUT("SPKOUTN"),
241 static const struct snd_soc_dapm_route audio_map[] = {
242 /* Mono output mixer */
243 {"Mono Mixer", "PCM Playback Switch", "DAC"},
244 {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
245 {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
247 /* Speaker output mixer */
248 {"Speaker Mixer", "PCM Playback Switch", "DAC"},
249 {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
250 {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
253 {"Mono Out", NULL, "Mono Mixer"},
254 {"MONOOUT", NULL, "Mono Out"},
255 {"SpkN Out", NULL, "Speaker Mixer"},
256 {"SpkP Out", NULL, "Speaker Mixer"},
257 {"SPKOUTN", NULL, "SpkN Out"},
258 {"SPKOUTP", NULL, "SpkP Out"},
261 {"ADC", NULL, "Boost Mixer"},
262 {"Boost Mixer", "Aux Switch", "Aux Input"},
263 {"Boost Mixer", NULL, "Input PGA"},
264 {"Boost Mixer", NULL, "MICP"},
267 {"Input PGA", "Aux Switch", "Aux Input"},
268 {"Input PGA", "MicN Switch", "MICN"},
269 {"Input PGA", "MicP Switch", "MICP"},
272 {"Aux Input", NULL, "AUX"},
275 static int wm8974_add_widgets(struct snd_soc_codec *codec)
277 snd_soc_dapm_new_controls(codec, wm8974_dapm_widgets,
278 ARRAY_SIZE(wm8974_dapm_widgets));
280 snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
286 unsigned int pre_div:1;
291 /* The size in bits of the pll divide multiplied by 10
292 * to allow rounding later */
293 #define FIXED_PLL_SIZE ((1 << 24) * 10)
295 static void pll_factors(struct pll_ *pll_div,
296 unsigned int target, unsigned int source)
298 unsigned long long Kpart;
299 unsigned int K, Ndiv, Nmod;
301 /* There is a fixed divide by 4 in the output path */
304 Ndiv = target / source;
307 pll_div->pre_div = 1;
308 Ndiv = target / source;
310 pll_div->pre_div = 0;
312 if ((Ndiv < 6) || (Ndiv > 12))
314 "WM8974 N value %u outwith recommended range!\n",
318 Nmod = target % source;
319 Kpart = FIXED_PLL_SIZE * (long long)Nmod;
321 do_div(Kpart, source);
323 K = Kpart & 0xFFFFFFFF;
325 /* Check if we need to round */
329 /* Move down to proper range now rounding is done */
335 static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
336 int source, unsigned int freq_in, unsigned int freq_out)
338 struct snd_soc_codec *codec = codec_dai->codec;
342 if (freq_in == 0 || freq_out == 0) {
343 /* Clock CODEC directly from MCLK */
344 reg = snd_soc_read(codec, WM8974_CLOCK);
345 snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);
348 reg = snd_soc_read(codec, WM8974_POWER1);
349 snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
353 pll_factors(&pll_div, freq_out, freq_in);
355 snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
356 snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
357 snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
358 snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
359 reg = snd_soc_read(codec, WM8974_POWER1);
360 snd_soc_write(codec, WM8974_POWER1, reg | 0x020);
362 /* Run CODEC from PLL instead of MCLK */
363 reg = snd_soc_read(codec, WM8974_CLOCK);
364 snd_soc_write(codec, WM8974_CLOCK, reg | 0x100);
370 * Configure WM8974 clock dividers.
372 static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
375 struct snd_soc_codec *codec = codec_dai->codec;
379 case WM8974_OPCLKDIV:
380 reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
381 snd_soc_write(codec, WM8974_GPIO, reg | div);
384 reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
385 snd_soc_write(codec, WM8974_CLOCK, reg | div);
388 reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
389 snd_soc_write(codec, WM8974_CLOCK, reg | div);
398 static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
401 struct snd_soc_codec *codec = codec_dai->codec;
403 u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;
405 /* set master/slave audio interface */
406 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
407 case SND_SOC_DAIFMT_CBM_CFM:
410 case SND_SOC_DAIFMT_CBS_CFS:
416 /* interface format */
417 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
418 case SND_SOC_DAIFMT_I2S:
421 case SND_SOC_DAIFMT_RIGHT_J:
423 case SND_SOC_DAIFMT_LEFT_J:
426 case SND_SOC_DAIFMT_DSP_A:
433 /* clock inversion */
434 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
435 case SND_SOC_DAIFMT_NB_NF:
437 case SND_SOC_DAIFMT_IB_IF:
440 case SND_SOC_DAIFMT_IB_NF:
443 case SND_SOC_DAIFMT_NB_IF:
450 snd_soc_write(codec, WM8974_IFACE, iface);
451 snd_soc_write(codec, WM8974_CLOCK, clk);
455 static int wm8974_pcm_hw_params(struct snd_pcm_substream *substream,
456 struct snd_pcm_hw_params *params,
457 struct snd_soc_dai *dai)
459 struct snd_soc_codec *codec = dai->codec;
460 u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
461 u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;
464 switch (params_format(params)) {
465 case SNDRV_PCM_FORMAT_S16_LE:
467 case SNDRV_PCM_FORMAT_S20_3LE:
470 case SNDRV_PCM_FORMAT_S24_LE:
473 case SNDRV_PCM_FORMAT_S32_LE:
478 /* filter coefficient */
479 switch (params_rate(params)) {
500 snd_soc_write(codec, WM8974_IFACE, iface);
501 snd_soc_write(codec, WM8974_ADD, adn);
505 static int wm8974_mute(struct snd_soc_dai *dai, int mute)
507 struct snd_soc_codec *codec = dai->codec;
508 u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;
511 snd_soc_write(codec, WM8974_DAC, mute_reg | 0x40);
513 snd_soc_write(codec, WM8974_DAC, mute_reg);
517 /* liam need to make this lower power with dapm */
518 static int wm8974_set_bias_level(struct snd_soc_codec *codec,
519 enum snd_soc_bias_level level)
521 u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;
524 case SND_SOC_BIAS_ON:
525 case SND_SOC_BIAS_PREPARE:
526 power1 |= 0x1; /* VMID 50k */
527 snd_soc_write(codec, WM8974_POWER1, power1);
530 case SND_SOC_BIAS_STANDBY:
531 power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;
533 if (codec->bias_level == SND_SOC_BIAS_OFF) {
534 /* Initial cap charge at VMID 5k */
535 snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
539 power1 |= 0x2; /* VMID 500k */
540 snd_soc_write(codec, WM8974_POWER1, power1);
543 case SND_SOC_BIAS_OFF:
544 snd_soc_write(codec, WM8974_POWER1, 0);
545 snd_soc_write(codec, WM8974_POWER2, 0);
546 snd_soc_write(codec, WM8974_POWER3, 0);
550 codec->bias_level = level;
554 #define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)
556 #define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
557 SNDRV_PCM_FMTBIT_S24_LE)
559 static struct snd_soc_dai_ops wm8974_ops = {
560 .hw_params = wm8974_pcm_hw_params,
561 .digital_mute = wm8974_mute,
562 .set_fmt = wm8974_set_dai_fmt,
563 .set_clkdiv = wm8974_set_dai_clkdiv,
564 .set_pll = wm8974_set_dai_pll,
567 static struct snd_soc_dai_driver wm8974_dai = {
568 .name = "wm8974-hifi",
570 .stream_name = "Playback",
572 .channels_max = 2, /* Only 1 channel of data */
573 .rates = WM8974_RATES,
574 .formats = WM8974_FORMATS,},
576 .stream_name = "Capture",
578 .channels_max = 2, /* Only 1 channel of data */
579 .rates = WM8974_RATES,
580 .formats = WM8974_FORMATS,},
582 .symmetric_rates = 1,
585 static int wm8974_suspend(struct snd_soc_codec *codec, pm_message_t state)
587 wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
591 static int wm8974_resume(struct snd_soc_codec *codec)
595 u16 *cache = codec->reg_cache;
597 /* Sync reg_cache with the hardware */
598 for (i = 0; i < ARRAY_SIZE(wm8974_reg); i++) {
599 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
600 data[1] = cache[i] & 0x00ff;
601 codec->hw_write(codec->control_data, data, 2);
603 wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
608 static int wm8974_probe(struct snd_soc_codec *codec)
612 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
614 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
618 ret = wm8974_reset(codec);
620 dev_err(codec->dev, "Failed to issue reset\n");
624 wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
625 snd_soc_add_controls(codec, wm8974_snd_controls,
626 ARRAY_SIZE(wm8974_snd_controls));
627 wm8974_add_widgets(codec);
632 /* power down chip */
633 static int wm8974_remove(struct snd_soc_codec *codec)
635 wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
639 static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
640 .probe = wm8974_probe,
641 .remove = wm8974_remove,
642 .suspend = wm8974_suspend,
643 .resume = wm8974_resume,
644 .set_bias_level = wm8974_set_bias_level,
645 .reg_cache_size = ARRAY_SIZE(wm8974_reg),
646 .reg_word_size = sizeof(u16),
647 .reg_cache_default = wm8974_reg,
650 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
651 static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
652 const struct i2c_device_id *id)
654 struct wm8974_priv *wm8974;
657 wm8974 = kzalloc(sizeof(struct wm8974_priv), GFP_KERNEL);
661 i2c_set_clientdata(i2c, wm8974);
663 ret = snd_soc_register_codec(&i2c->dev,
664 &soc_codec_dev_wm8974, &wm8974_dai, 1);
670 static __devexit int wm8974_i2c_remove(struct i2c_client *client)
672 snd_soc_unregister_codec(&client->dev);
673 kfree(i2c_get_clientdata(client));
677 static const struct i2c_device_id wm8974_i2c_id[] = {
681 MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);
683 static struct i2c_driver wm8974_i2c_driver = {
685 .name = "wm8974-codec",
686 .owner = THIS_MODULE,
688 .probe = wm8974_i2c_probe,
689 .remove = __devexit_p(wm8974_i2c_remove),
690 .id_table = wm8974_i2c_id,
694 static int __init wm8974_modinit(void)
697 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
698 ret = i2c_add_driver(&wm8974_i2c_driver);
700 printk(KERN_ERR "Failed to register wm8974 I2C driver: %d\n",
706 module_init(wm8974_modinit);
708 static void __exit wm8974_exit(void)
710 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
711 i2c_del_driver(&wm8974_i2c_driver);
714 module_exit(wm8974_exit);
716 MODULE_DESCRIPTION("ASoC WM8974 driver");
717 MODULE_AUTHOR("Liam Girdwood");
718 MODULE_LICENSE("GPL");