- 根目录:
- sound
- soc
- codecs
- wm8974.c
/*
* wm8974.c -- WM8974 ALSA Soc Audio driver
*
* Copyright 2006-2009 Wolfson Microelectronics PLC.
*
* Author: Liam Girdwood <linux@wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include "wm8974.h"
static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
0x0000, 0x0000, 0x0000, 0x0000,
0x0050, 0x0000, 0x0140, 0x0000,
0x0000, 0x0000, 0x0000, 0x00ff,
0x0000, 0x0000, 0x0100, 0x00ff,
0x0000, 0x0000, 0x012c, 0x002c,
0x002c, 0x002c, 0x002c, 0x0000,
0x0032, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000,
0x0038, 0x000b, 0x0032, 0x0000,
0x0008, 0x000c, 0x0093, 0x00e9,
0x0000, 0x0000, 0x0000, 0x0000,
0x0003, 0x0010, 0x0000, 0x0000,
0x0000, 0x0002, 0x0000, 0x0000,
0x0000, 0x0000, 0x0039, 0x0000,
0x0000,
};
#define WM8974_POWER1_BIASEN 0x08
#define WM8974_POWER1_BUFIOEN 0x04
struct wm8974_priv {
enum snd_soc_control_type control_type;
};
#define wm8974_reset(c) snd_soc_write(c, WM8974_RESET, 0)
static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
static const char *wm8974_eqmode[] = {"Capture", "Playback" };
static const char *wm8974_bw[] = {"Narrow", "Wide" };
static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
static const char *wm8974_alc[] = {"ALC", "Limiter" };
static const struct soc_enum wm8974_enum[] = {
SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
SOC_ENUM_SINGLE(WM8974_DAC, 4, 4, wm8974_deemp),
SOC_ENUM_SINGLE(WM8974_EQ1, 8, 2, wm8974_eqmode),
SOC_ENUM_SINGLE(WM8974_EQ1, 5, 4, wm8974_eq1),
SOC_ENUM_SINGLE(WM8974_EQ2, 8, 2, wm8974_bw),
SOC_ENUM_SINGLE(WM8974_EQ2, 5, 4, wm8974_eq2),
SOC_ENUM_SINGLE(WM8974_EQ3, 8, 2, wm8974_bw),
SOC_ENUM_SINGLE(WM8974_EQ3, 5, 4, wm8974_eq3),
SOC_ENUM_SINGLE(WM8974_EQ4, 8, 2, wm8974_bw),
SOC_ENUM_SINGLE(WM8974_EQ4, 5, 4, wm8974_eq4),
SOC_ENUM_SINGLE(WM8974_EQ5, 8, 2, wm8974_bw),
SOC_ENUM_SINGLE(WM8974_EQ5, 5, 4, wm8974_eq5),
SOC_ENUM_SINGLE(WM8974_ALC3, 8, 2, wm8974_alc),
};
static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };
static const struct soc_enum wm8974_auxmode =
SOC_ENUM_SINGLE(WM8974_INPUT, 3, 2, wm8974_auxmode_text);
static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
static const struct snd_kcontrol_new wm8974_snd_controls[] = {
SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),
SOC_ENUM("DAC Companding", wm8974_enum[1]),
SOC_ENUM("ADC Companding", wm8974_enum[0]),
SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),
SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),
SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),
SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL, 0, 255, 0, digital_tlv),
SOC_ENUM("Equaliser Function", wm8974_enum[3]),
SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ2 Bandwith", wm8974_enum[5]),
SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ3 Bandwith", wm8974_enum[7]),
SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ4 Bandwith", wm8974_enum[9]),
SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ5 Bandwith", wm8974_enum[11]),
SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5, 0, 24, 1, eq_tlv),
SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1, 8, 1, 0),
SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1, 4, 15, 0),
SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1, 0, 15, 0),
SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2, 4, 7, 0),
SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2, 0, 15, 0),
SOC_SINGLE("ALC Enable Switch", WM8974_ALC1, 8, 1, 0),
SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1, 3, 7, 0),
SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1, 0, 7, 0),
SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2, 8, 1, 0),
SOC_SINGLE("ALC Capture Hold", WM8974_ALC2, 4, 7, 0),
SOC_SINGLE("ALC Capture Target", WM8974_ALC2, 0, 15, 0),
SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
SOC_SINGLE("ALC Capture Decay", WM8974_ALC3, 4, 15, 0),
SOC_SINGLE("ALC Capture Attack", WM8974_ALC3, 0, 15, 0),
SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE, 3, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE, 0, 7, 0),
SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA, 7, 1, 0),
SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA, 0, 63, 0, inpga_tlv),
SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL, 7, 1, 0),
SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL, 6, 1, 1),
SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL, 0, 63, 0, spk_tlv),
SOC_ENUM("Aux Mode", wm8974_auxmode),
SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST, 8, 1, 0),
SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),
/* DAC / ADC oversampling */
SOC_SINGLE("DAC 128x Oversampling Switch", WM8974_DAC, 8, 1, 0),
SOC_SINGLE("ADC 128x Oversampling Switch", WM8974_ADC, 8, 1, 0),
};
/* Speaker Output Mixer */
static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 0),
};
/* Mono Output Mixer */
static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
};
/* Boost mixer */
static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
};
/* Input PGA */
static const struct snd_kcontrol_new wm8974_inpga[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
};
/* AUX Input boost vol */
static const struct snd_kcontrol_new wm8974_aux_boost_controls =
SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);
/* Mic Input boost vol */
static const struct snd_kcontrol_new wm8974_mic_boost_controls =
SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);
static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
&wm8974_speaker_mixer_controls[0],
ARRAY_SIZE(wm8974_speaker_mixer_controls)),
SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
&wm8974_mono_mixer_controls[0],
ARRAY_SIZE(wm8974_mono_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),
SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
ARRAY_SIZE(wm8974_inpga)),
SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),
SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),
SND_SOC_DAPM_INPUT("MICN"),
SND_SOC_DAPM_INPUT("MICP"),
SND_SOC_DAPM_INPUT("AUX"),
SND_SOC_DAPM_OUTPUT("MONOOUT"),
SND_SOC_DAPM_OUTPUT("SPKOUTP"),
SND_SOC_DAPM_OUTPUT("SPKOUTN"),
};
static const struct snd_soc_dapm_route audio_map[] = {
/* Mono output mixer */
{"Mono Mixer", "PCM Playback Switch", "DAC"},
{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
/* Speaker output mixer */
{"Speaker Mixer", "PCM Playback Switch", "DAC"},
{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
/* Outputs */
{"Mono Out", NULL, "Mono Mixer"},
{"MONOOUT", NULL, "Mono Out"},
{"SpkN Out", NULL, "Speaker Mixer"},
{"SpkP Out", NULL, "Speaker Mixer"},
{"SPKOUTN", NULL, "SpkN Out"},
{"SPKOUTP", NULL, "SpkP Out"},
/* Boost Mixer */
{"ADC", NULL, "Boost Mixer"},
{"Boost Mixer", "Aux Switch", "Aux Input"},
{"Boost Mixer", NULL, "Input PGA"},
{"Boost Mixer", NULL, "MICP"},
/* Input PGA */
{"Input PGA", "Aux Switch", "Aux Input"},
{"Input PGA", "MicN Switch", "MICN"},
{"Input PGA", "MicP Switch", "MICP"},
/* Inputs */
{"Aux Input", NULL, "AUX"},
};
static int wm8974_add_widgets(struct snd_soc_codec *codec)
{
struct snd_soc_dapm_context *dapm = &codec->dapm;
snd_soc_dapm_new_controls(dapm, wm8974_dapm_widgets,
ARRAY_SIZE(wm8974_dapm_widgets));
snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
return 0;
}
struct pll_ {
unsigned int pre_div:1;
unsigned int n:4;
unsigned int k;
};
/* The size in bits of the pll divide multiplied by 10
* to allow rounding later */
#define FIXED_PLL_SIZE ((1 << 24) * 10)
static void pll_factors(struct pll_ *pll_div,
unsigned int target, unsigned int source)
{
unsigned long long Kpart;
unsigned int K, Ndiv, Nmod;
/* There is a fixed divide by 4 in the output path */
target *= 4;
Ndiv = target / source;
if (Ndiv < 6) {
source /= 2;
pll_div->pre_div = 1;
Ndiv = target / source;
} else
pll_div->pre_div = 0;
if ((Ndiv < 6) || (Ndiv > 12))
printk(KERN_WARNING
"WM8974 N value %u outwith recommended range!\n",
Ndiv);
pll_div->n = Ndiv;
Nmod = target % source;
Kpart = FIXED_PLL_SIZE * (long long)Nmod;
do_div(Kpart, source);
K = Kpart & 0xFFFFFFFF;
/* Check if we need to round */
if ((K % 10) >= 5)
K += 5;
/* Move down to proper range now rounding is done */
K /= 10;
pll_div->k = K;
}
static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
int source, unsigned int freq_in, unsigned int freq_out)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct pll_ pll_div;
u16 reg;
if (freq_in == 0 || freq_out == 0) {
/* Clock CODEC directly from MCLK */
reg = snd_soc_read(codec, WM8974_CLOCK);
snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);
/* Turn off PLL */
reg = snd_soc_read(codec, WM8974_POWER1);
snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
return 0;
}
pll_factors(&pll_div, freq_out, freq_in);
snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
reg = snd_soc_read(codec, WM8974_POWER1);
snd_soc_write(codec, WM8974_POWER1, reg | 0x020);
/* Run CODEC from PLL instead of MCLK */
reg = snd_soc_read(codec, WM8974_CLOCK);
snd_soc_write(codec, WM8974_CLOCK, reg | 0x100);
return 0;
}
/*
* Configure WM8974 clock dividers.
*/
static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
int div_id, int div)
{
struct snd_soc_codec *codec = codec_dai->codec;
u16 reg;
switch (div_id) {
case WM8974_OPCLKDIV:
reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
snd_soc_write(codec, WM8974_GPIO, reg | div);
break;
case WM8974_MCLKDIV:
reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
snd_soc_write(codec, WM8974_CLOCK, reg | div);
break;
case WM8974_BCLKDIV:
reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
snd_soc_write(codec, WM8974_CLOCK, reg | div);
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int fmt)
{
struct snd_soc_codec *codec = codec_dai->codec;
u16 iface = 0;
u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;
/* set master/slave audio interface */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
clk |= 0x0001;
break;
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
iface |= 0x0010;
break;
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_LEFT_J:
iface |= 0x0008;
break;
case SND_SOC_DAIFMT_DSP_A:
iface |= 0x00018;
break;
default:
return -EINVAL;
}
/* clock inversion */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_IB_IF:
iface |= 0x0180;
break;
case SND_SOC_DAIFMT_IB_NF:
iface |= 0x0100;
break;
case SND_SOC_DAIFMT_NB_IF:
iface |= 0x0080;
break;
default:
return -EINVAL;
}
snd_soc_write(codec, WM8974_IFACE, iface);
snd_soc_write(codec, WM8974_CLOCK, clk);
return 0;
}
static int wm8974_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;
/* bit size */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
break;
case SNDRV_PCM_FORMAT_S20_3LE:
iface |= 0x0020;
break;
case SNDRV_PCM_FORMAT_S24_LE:
iface |= 0x0040;
break;
case SNDRV_PCM_FORMAT_S32_LE:
iface |= 0x0060;
break;
}
/* filter coefficient */
switch (params_rate(params)) {
case 8000:
adn |= 0x5 << 1;
break;
case 11025:
adn |= 0x4 << 1;
break;
case 16000:
adn |= 0x3 << 1;
break;
case 22050:
adn |= 0x2 << 1;
break;
case 32000:
adn |= 0x1 << 1;
break;
case 44100:
case 48000:
break;
}
snd_soc_write(codec, WM8974_IFACE, iface);
snd_soc_write(codec, WM8974_ADD, adn);
return 0;
}
static int wm8974_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;
if (mute)
snd_soc_write(codec, WM8974_DAC, mute_reg | 0x40);
else
snd_soc_write(codec, WM8974_DAC, mute_reg);
return 0;
}
/* liam need to make this lower power with dapm */
static int wm8974_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
power1 |= 0x1; /* VMID 50k */
snd_soc_write(codec, WM8974_POWER1, power1);
break;
case SND_SOC_BIAS_STANDBY:
power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
/* Initial cap charge at VMID 5k */
snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
mdelay(100);
}
power1 |= 0x2; /* VMID 500k */
snd_soc_write(codec, WM8974_POWER1, power1);
break;
case SND_SOC_BIAS_OFF:
snd_soc_write(codec, WM8974_POWER1, 0);
snd_soc_write(codec, WM8974_POWER2, 0);
snd_soc_write(codec, WM8974_POWER3, 0);
break;
}
codec->dapm.bias_level = level;
return 0;
}
#define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)
#define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
SNDRV_PCM_FMTBIT_S24_LE)
static struct snd_soc_dai_ops wm8974_ops = {
.hw_params = wm8974_pcm_hw_params,
.digital_mute = wm8974_mute,
.set_fmt = wm8974_set_dai_fmt,
.set_clkdiv = wm8974_set_dai_clkdiv,
.set_pll = wm8974_set_dai_pll,
};
static struct snd_soc_dai_driver wm8974_dai = {
.name = "wm8974-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2, /* Only 1 channel of data */
.rates = WM8974_RATES,
.formats = WM8974_FORMATS,},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2, /* Only 1 channel of data */
.rates = WM8974_RATES,
.formats = WM8974_FORMATS,},
.ops = &wm8974_ops,
.symmetric_rates = 1,
};
static int wm8974_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static int wm8974_resume(struct snd_soc_codec *codec)
{
int i;
u8 data[2];
u16 *cache = codec->reg_cache;
/* Sync reg_cache with the hardware */
for (i = 0; i < ARRAY_SIZE(wm8974_reg); i++) {
data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
data[1] = cache[i] & 0x00ff;
codec->hw_write(codec->control_data, data, 2);
}
wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
return 0;
}
static int wm8974_probe(struct snd_soc_codec *codec)
{
int ret = 0;
ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
if (ret < 0) {
dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
return ret;
}
ret = wm8974_reset(codec);
if (ret < 0) {
dev_err(codec->dev, "Failed to issue reset\n");
return ret;
}
wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
snd_soc_add_controls(codec, wm8974_snd_controls,
ARRAY_SIZE(wm8974_snd_controls));
wm8974_add_widgets(codec);
return ret;
}
/* power down chip */
static int wm8974_remove(struct snd_soc_codec *codec)
{
wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static struct snd_soc_codec_driver soc_codec_dev_wm8974 = {
.probe = wm8974_probe,
.remove = wm8974_remove,
.suspend = wm8974_suspend,
.resume = wm8974_resume,
.set_bias_level = wm8974_set_bias_level,
.reg_cache_size = ARRAY_SIZE(wm8974_reg),
.reg_word_size = sizeof(u16),
.reg_cache_default = wm8974_reg,
};
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8974_priv *wm8974;
int ret;
wm8974 = kzalloc(sizeof(struct wm8974_priv), GFP_KERNEL);
if (wm8974 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, wm8974);
ret = snd_soc_register_codec(&i2c->dev,
&soc_codec_dev_wm8974, &wm8974_dai, 1);
if (ret < 0)
kfree(wm8974);
return ret;
}
static __devexit int wm8974_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
kfree(i2c_get_clientdata(client));
return 0;
}
static const struct i2c_device_id wm8974_i2c_id[] = {
{ "wm8974", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);
static struct i2c_driver wm8974_i2c_driver = {
.driver = {
.name = "wm8974-codec",
.owner = THIS_MODULE,
},
.probe = wm8974_i2c_probe,
.remove = __devexit_p(wm8974_i2c_remove),
.id_table = wm8974_i2c_id,
};
#endif
static int __init wm8974_modinit(void)
{
int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
ret = i2c_add_driver(&wm8974_i2c_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register wm8974 I2C driver: %d\n",
ret);
}
#endif
return ret;
}
module_init(wm8974_modinit);
static void __exit wm8974_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_del_driver(&wm8974_i2c_driver);
#endif
}
module_exit(wm8974_exit);
MODULE_DESCRIPTION("ASoC WM8974 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");