iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
afa2f1066e
linux/sound/soc/codecs/wm8961.c

1327 lines
34 KiB
C
Raw Normal View History

ASoC: Add WM8961 driver The WM8961 is a low power, high quality stereo CODEC designed for portable digital applications with headphone and stereo class D speaker drivers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-09 12:55:51 +04:00
/*
* wm8961.c -- WM8961 ALSA SoC Audio driver
*
* Author: Mark Brown
*
* 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.
*
* Currently unimplemented features:
* - ALC
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include "wm8961.h"
#define WM8961_MAX_REGISTER 0xFC
static u16 wm8961_reg_defaults[] = {
0x009F, /* R0 - Left Input volume */
0x009F, /* R1 - Right Input volume */
0x0000, /* R2 - LOUT1 volume */
0x0000, /* R3 - ROUT1 volume */
0x0020, /* R4 - Clocking1 */
0x0008, /* R5 - ADC & DAC Control 1 */
0x0000, /* R6 - ADC & DAC Control 2 */
0x000A, /* R7 - Audio Interface 0 */
0x01F4, /* R8 - Clocking2 */
0x0000, /* R9 - Audio Interface 1 */
0x00FF, /* R10 - Left DAC volume */
0x00FF, /* R11 - Right DAC volume */
0x0000, /* R12 */
0x0000, /* R13 */
0x0040, /* R14 - Audio Interface 2 */
0x0000, /* R15 - Software Reset */
0x0000, /* R16 */
0x007B, /* R17 - ALC1 */
0x0000, /* R18 - ALC2 */
0x0032, /* R19 - ALC3 */
0x0000, /* R20 - Noise Gate */
0x00C0, /* R21 - Left ADC volume */
0x00C0, /* R22 - Right ADC volume */
0x0120, /* R23 - Additional control(1) */
0x0000, /* R24 - Additional control(2) */
0x0000, /* R25 - Pwr Mgmt (1) */
0x0000, /* R26 - Pwr Mgmt (2) */
0x0000, /* R27 - Additional Control (3) */
0x0000, /* R28 - Anti-pop */
0x0000, /* R29 */
0x005F, /* R30 - Clocking 3 */
0x0000, /* R31 */
0x0000, /* R32 - ADCL signal path */
0x0000, /* R33 - ADCR signal path */
0x0000, /* R34 */
0x0000, /* R35 */
0x0000, /* R36 */
0x0000, /* R37 */
0x0000, /* R38 */
0x0000, /* R39 */
0x0000, /* R40 - LOUT2 volume */
0x0000, /* R41 - ROUT2 volume */
0x0000, /* R42 */
0x0000, /* R43 */
0x0000, /* R44 */
0x0000, /* R45 */
0x0000, /* R46 */
0x0000, /* R47 - Pwr Mgmt (3) */
0x0023, /* R48 - Additional Control (4) */
0x0000, /* R49 - Class D Control 1 */
0x0000, /* R50 */
0x0003, /* R51 - Class D Control 2 */
0x0000, /* R52 */
0x0000, /* R53 */
0x0000, /* R54 */
0x0000, /* R55 */
0x0106, /* R56 - Clocking 4 */
0x0000, /* R57 - DSP Sidetone 0 */
0x0000, /* R58 - DSP Sidetone 1 */
0x0000, /* R59 */
0x0000, /* R60 - DC Servo 0 */
0x0000, /* R61 - DC Servo 1 */
0x0000, /* R62 */
0x015E, /* R63 - DC Servo 3 */
0x0010, /* R64 */
0x0010, /* R65 - DC Servo 5 */
0x0000, /* R66 */
0x0001, /* R67 */
0x0003, /* R68 - Analogue PGA Bias */
0x0000, /* R69 - Analogue HP 0 */
0x0060, /* R70 */
0x01FB, /* R71 - Analogue HP 2 */
0x0000, /* R72 - Charge Pump 1 */
0x0065, /* R73 */
0x005F, /* R74 */
0x0059, /* R75 */
0x006B, /* R76 */
0x0038, /* R77 */
0x000C, /* R78 */
0x000A, /* R79 */
0x006B, /* R80 */
0x0000, /* R81 */
0x0000, /* R82 - Charge Pump B */
0x0087, /* R83 */
0x0000, /* R84 */
0x005C, /* R85 */
0x0000, /* R86 */
0x0000, /* R87 - Write Sequencer 1 */
0x0000, /* R88 - Write Sequencer 2 */
0x0000, /* R89 - Write Sequencer 3 */
0x0000, /* R90 - Write Sequencer 4 */
0x0000, /* R91 - Write Sequencer 5 */
0x0000, /* R92 - Write Sequencer 6 */
0x0000, /* R93 - Write Sequencer 7 */
0x0000, /* R94 */
0x0000, /* R95 */
0x0000, /* R96 */
0x0000, /* R97 */
0x0000, /* R98 */
0x0000, /* R99 */
0x0000, /* R100 */
0x0000, /* R101 */
0x0000, /* R102 */
0x0000, /* R103 */
0x0000, /* R104 */
0x0000, /* R105 */
0x0000, /* R106 */
0x0000, /* R107 */
0x0000, /* R108 */
0x0000, /* R109 */
0x0000, /* R110 */
0x0000, /* R111 */
0x0000, /* R112 */
0x0000, /* R113 */
0x0000, /* R114 */
0x0000, /* R115 */
0x0000, /* R116 */
0x0000, /* R117 */
0x0000, /* R118 */
0x0000, /* R119 */
0x0000, /* R120 */
0x0000, /* R121 */
0x0000, /* R122 */
0x0000, /* R123 */
0x0000, /* R124 */
0x0000, /* R125 */
0x0000, /* R126 */
0x0000, /* R127 */
0x0000, /* R128 */
0x0000, /* R129 */
0x0000, /* R130 */
0x0000, /* R131 */
0x0000, /* R132 */
0x0000, /* R133 */
0x0000, /* R134 */
0x0000, /* R135 */
0x0000, /* R136 */
0x0000, /* R137 */
0x0000, /* R138 */
0x0000, /* R139 */
0x0000, /* R140 */
0x0000, /* R141 */
0x0000, /* R142 */
0x0000, /* R143 */
0x0000, /* R144 */
0x0000, /* R145 */
0x0000, /* R146 */
0x0000, /* R147 */
0x0000, /* R148 */
0x0000, /* R149 */
0x0000, /* R150 */
0x0000, /* R151 */
0x0000, /* R152 */
0x0000, /* R153 */
0x0000, /* R154 */
0x0000, /* R155 */
0x0000, /* R156 */
0x0000, /* R157 */
0x0000, /* R158 */
0x0000, /* R159 */
0x0000, /* R160 */
0x0000, /* R161 */
0x0000, /* R162 */
0x0000, /* R163 */
0x0000, /* R164 */
0x0000, /* R165 */
0x0000, /* R166 */
0x0000, /* R167 */
0x0000, /* R168 */
0x0000, /* R169 */
0x0000, /* R170 */
0x0000, /* R171 */
0x0000, /* R172 */
0x0000, /* R173 */
0x0000, /* R174 */
0x0000, /* R175 */
0x0000, /* R176 */
0x0000, /* R177 */
0x0000, /* R178 */
0x0000, /* R179 */
0x0000, /* R180 */
0x0000, /* R181 */
0x0000, /* R182 */
0x0000, /* R183 */
0x0000, /* R184 */
0x0000, /* R185 */
0x0000, /* R186 */
0x0000, /* R187 */
0x0000, /* R188 */
0x0000, /* R189 */
0x0000, /* R190 */
0x0000, /* R191 */
0x0000, /* R192 */
0x0000, /* R193 */
0x0000, /* R194 */
0x0000, /* R195 */
0x0030, /* R196 */
0x0006, /* R197 */
0x0000, /* R198 */
0x0060, /* R199 */
0x0000, /* R200 */
0x003F, /* R201 */
0x0000, /* R202 */
0x0000, /* R203 */
0x0000, /* R204 */
0x0001, /* R205 */
0x0000, /* R206 */
0x0181, /* R207 */
0x0005, /* R208 */
0x0008, /* R209 */
0x0008, /* R210 */
0x0000, /* R211 */
0x013B, /* R212 */
0x0000, /* R213 */
0x0000, /* R214 */
0x0000, /* R215 */
0x0000, /* R216 */
0x0070, /* R217 */
0x0000, /* R218 */
0x0000, /* R219 */
0x0000, /* R220 */
0x0000, /* R221 */
0x0000, /* R222 */
0x0003, /* R223 */
0x0000, /* R224 */
0x0000, /* R225 */
0x0001, /* R226 */
0x0008, /* R227 */
0x0000, /* R228 */
0x0000, /* R229 */
0x0000, /* R230 */
0x0000, /* R231 */
0x0004, /* R232 */
0x0000, /* R233 */
0x0000, /* R234 */
0x0000, /* R235 */
0x0000, /* R236 */
0x0000, /* R237 */
0x0080, /* R238 */
0x0000, /* R239 */
0x0000, /* R240 */
0x0000, /* R241 */
0x0000, /* R242 */
0x0000, /* R243 */
0x0000, /* R244 */
0x0052, /* R245 */
0x0110, /* R246 */
0x0040, /* R247 */
0x0000, /* R248 */
0x0030, /* R249 */
0x0000, /* R250 */
0x0000, /* R251 */
0x0001, /* R252 - General test 1 */
};
struct wm8961_priv {
struct snd_soc_codec codec;
int sysclk;
u16 reg_cache[WM8961_MAX_REGISTER];
};
static int wm8961_reg_is_volatile(int reg)
{
switch (reg) {
case WM8961_WRITE_SEQUENCER_7:
case WM8961_DC_SERVO_1:
return 1;
default:
return 0;
}
}
static unsigned int wm8961_read_reg_cache(struct snd_soc_codec *codec,
unsigned int reg)
{
u16 *cache = codec->reg_cache;
BUG_ON(reg > WM8961_MAX_REGISTER);
return cache[reg];
}
static unsigned int wm8961_read_hw(struct snd_soc_codec *codec, u8 reg)
{
struct i2c_msg xfer[2];
u16 data;
int ret;
struct i2c_client *client = codec->control_data;
BUG_ON(reg > WM8961_MAX_REGISTER);
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = &reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 2;
xfer[1].buf = (u8 *)&data;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret != 2) {
dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
return 0;
}
return (data >> 8) | ((data & 0xff) << 8);
}
static unsigned int wm8961_read(struct snd_soc_codec *codec, unsigned int reg)
{
if (wm8961_reg_is_volatile(reg))
return wm8961_read_hw(codec, reg);
else
return wm8961_read_reg_cache(codec, reg);
}
static int wm8961_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u16 *cache = codec->reg_cache;
u8 data[3];
BUG_ON(reg > WM8961_MAX_REGISTER);
if (!wm8961_reg_is_volatile(reg))
cache[reg] = value;
data[0] = reg;
data[1] = value >> 8;
data[2] = value & 0x00ff;
if (codec->hw_write(codec->control_data, data, 3) == 3)
return 0;
else
return -EIO;
}
static int wm8961_reset(struct snd_soc_codec *codec)
{
return wm8961_write(codec, WM8961_SOFTWARE_RESET, 0);
}
/*
* The headphone output supports special anti-pop sequences giving
* silent power up and power down.
*/
static int wm8961_hp_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_codec *codec = w->codec;
u16 hp_reg = wm8961_read(codec, WM8961_ANALOGUE_HP_0);
u16 cp_reg = wm8961_read(codec, WM8961_CHARGE_PUMP_1);
u16 pwr_reg = wm8961_read(codec, WM8961_PWR_MGMT_2);
u16 dcs_reg = wm8961_read(codec, WM8961_DC_SERVO_1);
int timeout = 500;
if (event & SND_SOC_DAPM_POST_PMU) {
/* Make sure the output is shorted */
hp_reg &= ~(WM8961_HPR_RMV_SHORT | WM8961_HPL_RMV_SHORT);
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Enable the charge pump */
cp_reg |= WM8961_CP_ENA;
wm8961_write(codec, WM8961_CHARGE_PUMP_1, cp_reg);
mdelay(5);
/* Enable the PGA */
pwr_reg |= WM8961_LOUT1_PGA | WM8961_ROUT1_PGA;
wm8961_write(codec, WM8961_PWR_MGMT_2, pwr_reg);
/* Enable the amplifier */
hp_reg |= WM8961_HPR_ENA | WM8961_HPL_ENA;
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Second stage enable */
hp_reg |= WM8961_HPR_ENA_DLY | WM8961_HPL_ENA_DLY;
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Enable the DC servo & trigger startup */
dcs_reg |=
WM8961_DCS_ENA_CHAN_HPR | WM8961_DCS_TRIG_STARTUP_HPR |
WM8961_DCS_ENA_CHAN_HPL | WM8961_DCS_TRIG_STARTUP_HPL;
dev_dbg(codec->dev, "Enabling DC servo\n");
wm8961_write(codec, WM8961_DC_SERVO_1, dcs_reg);
do {
msleep(1);
dcs_reg = wm8961_read(codec, WM8961_DC_SERVO_1);
} while (--timeout &&
dcs_reg & (WM8961_DCS_TRIG_STARTUP_HPR |
WM8961_DCS_TRIG_STARTUP_HPL));
if (dcs_reg & (WM8961_DCS_TRIG_STARTUP_HPR |
WM8961_DCS_TRIG_STARTUP_HPL))
dev_err(codec->dev, "DC servo timed out\n");
else
dev_dbg(codec->dev, "DC servo startup complete\n");
/* Enable the output stage */
hp_reg |= WM8961_HPR_ENA_OUTP | WM8961_HPL_ENA_OUTP;
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Remove the short on the output stage */
hp_reg |= WM8961_HPR_RMV_SHORT | WM8961_HPL_RMV_SHORT;
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
}
if (event & SND_SOC_DAPM_PRE_PMD) {
/* Short the output */
hp_reg &= ~(WM8961_HPR_RMV_SHORT | WM8961_HPL_RMV_SHORT);
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Disable the output stage */
hp_reg &= ~(WM8961_HPR_ENA_OUTP | WM8961_HPL_ENA_OUTP);
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Disable DC offset cancellation */
dcs_reg &= ~(WM8961_DCS_ENA_CHAN_HPR |
WM8961_DCS_ENA_CHAN_HPL);
wm8961_write(codec, WM8961_DC_SERVO_1, dcs_reg);
/* Finish up */
hp_reg &= ~(WM8961_HPR_ENA_DLY | WM8961_HPR_ENA |
WM8961_HPL_ENA_DLY | WM8961_HPL_ENA);
wm8961_write(codec, WM8961_ANALOGUE_HP_0, hp_reg);
/* Disable the PGA */
pwr_reg &= ~(WM8961_LOUT1_PGA | WM8961_ROUT1_PGA);
wm8961_write(codec, WM8961_PWR_MGMT_2, pwr_reg);
/* Disable the charge pump */
dev_dbg(codec->dev, "Disabling charge pump\n");
wm8961_write(codec, WM8961_CHARGE_PUMP_1,
cp_reg & ~WM8961_CP_ENA);
}
return 0;
}
static int wm8961_spk_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_codec *codec = w->codec;
u16 pwr_reg = wm8961_read(codec, WM8961_PWR_MGMT_2);
u16 spk_reg = wm8961_read(codec, WM8961_CLASS_D_CONTROL_1);
if (event & SND_SOC_DAPM_POST_PMU) {
/* Enable the PGA */
pwr_reg |= WM8961_SPKL_PGA | WM8961_SPKR_PGA;
wm8961_write(codec, WM8961_PWR_MGMT_2, pwr_reg);
/* Enable the amplifier */
spk_reg |= WM8961_SPKL_ENA | WM8961_SPKR_ENA;
wm8961_write(codec, WM8961_CLASS_D_CONTROL_1, spk_reg);
}
if (event & SND_SOC_DAPM_PRE_PMD) {
/* Enable the amplifier */
spk_reg &= ~(WM8961_SPKL_ENA | WM8961_SPKR_ENA);
wm8961_write(codec, WM8961_CLASS_D_CONTROL_1, spk_reg);
/* Enable the PGA */
pwr_reg &= ~(WM8961_SPKL_PGA | WM8961_SPKR_PGA);
wm8961_write(codec, WM8961_PWR_MGMT_2, pwr_reg);
}
return 0;
}
static const char *adc_hpf_text[] = {
"Hi-fi", "Voice 1", "Voice 2", "Voice 3",
};
static const struct soc_enum adc_hpf =
SOC_ENUM_SINGLE(WM8961_ADC_DAC_CONTROL_2, 7, 4, adc_hpf_text);
static const char *dac_deemph_text[] = {
"None", "32kHz", "44.1kHz", "48kHz",
};
static const struct soc_enum dac_deemph =
SOC_ENUM_SINGLE(WM8961_ADC_DAC_CONTROL_1, 1, 4, dac_deemph_text);
static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
static const DECLARE_TLV_DB_SCALE(hp_sec_tlv, -700, 100, 0);
static const DECLARE_TLV_DB_SCALE(adc_tlv, -7200, 75, 1);
static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -3600, 300, 0);
static unsigned int boost_tlv[] = {
TLV_DB_RANGE_HEAD(4),
0, 0, TLV_DB_SCALE_ITEM(0, 0, 0),
1, 1, TLV_DB_SCALE_ITEM(13, 0, 0),
2, 2, TLV_DB_SCALE_ITEM(20, 0, 0),
3, 3, TLV_DB_SCALE_ITEM(29, 0, 0),
};
static const DECLARE_TLV_DB_SCALE(pga_tlv, -2325, 75, 0);
static const struct snd_kcontrol_new wm8961_snd_controls[] = {
SOC_DOUBLE_R_TLV("Headphone Volume", WM8961_LOUT1_VOLUME, WM8961_ROUT1_VOLUME,
0, 127, 0, out_tlv),
SOC_DOUBLE_TLV("Headphone Secondary Volume", WM8961_ANALOGUE_HP_2,
6, 3, 7, 0, hp_sec_tlv),
SOC_DOUBLE_R("Headphone ZC Switch", WM8961_LOUT1_VOLUME, WM8961_ROUT1_VOLUME,
7, 1, 0),
SOC_DOUBLE_R_TLV("Speaker Volume", WM8961_LOUT2_VOLUME, WM8961_ROUT2_VOLUME,
0, 127, 0, out_tlv),
SOC_DOUBLE_R("Speaker ZC Switch", WM8961_LOUT2_VOLUME, WM8961_ROUT2_VOLUME,
7, 1, 0),
SOC_SINGLE("Speaker AC Gain", WM8961_CLASS_D_CONTROL_2, 0, 7, 0),
SOC_SINGLE("DAC x128 OSR Switch", WM8961_ADC_DAC_CONTROL_2, 0, 1, 0),
SOC_ENUM("DAC Deemphasis", dac_deemph),
SOC_SINGLE("DAC Soft Mute Switch", WM8961_ADC_DAC_CONTROL_2, 3, 1, 0),
SOC_DOUBLE_R_TLV("Sidetone Volume", WM8961_DSP_SIDETONE_0,
WM8961_DSP_SIDETONE_1, 4, 12, 0, sidetone_tlv),
SOC_SINGLE("ADC High Pass Filter Switch", WM8961_ADC_DAC_CONTROL_1, 0, 1, 0),
SOC_ENUM("ADC High Pass Filter Mode", adc_hpf),
SOC_DOUBLE_R_TLV("Capture Volume",
WM8961_LEFT_ADC_VOLUME, WM8961_RIGHT_ADC_VOLUME,
1, 119, 0, adc_tlv),
SOC_DOUBLE_R_TLV("Capture Boost Volume",
WM8961_ADCL_SIGNAL_PATH, WM8961_ADCR_SIGNAL_PATH,
4, 3, 0, boost_tlv),
SOC_DOUBLE_R_TLV("Capture PGA Volume",
WM8961_LEFT_INPUT_VOLUME, WM8961_RIGHT_INPUT_VOLUME,
0, 62, 0, pga_tlv),
SOC_DOUBLE_R("Capture PGA ZC Switch",
WM8961_LEFT_INPUT_VOLUME, WM8961_RIGHT_INPUT_VOLUME,
6, 1, 1),
SOC_DOUBLE_R("Capture PGA Switch",
WM8961_LEFT_INPUT_VOLUME, WM8961_RIGHT_INPUT_VOLUME,
7, 1, 1),
};
static const char *sidetone_text[] = {
"None", "Left", "Right"
};
static const struct soc_enum dacl_sidetone =
SOC_ENUM_SINGLE(WM8961_DSP_SIDETONE_0, 2, 3, sidetone_text);
static const struct soc_enum dacr_sidetone =
SOC_ENUM_SINGLE(WM8961_DSP_SIDETONE_1, 2, 3, sidetone_text);
static const struct snd_kcontrol_new dacl_mux =
SOC_DAPM_ENUM("DACL Sidetone", dacl_sidetone);
static const struct snd_kcontrol_new dacr_mux =
SOC_DAPM_ENUM("DACR Sidetone", dacr_sidetone);
static const struct snd_soc_dapm_widget wm8961_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("LINPUT"),
SND_SOC_DAPM_INPUT("RINPUT"),
SND_SOC_DAPM_SUPPLY("CLK_DSP", WM8961_CLOCKING2, 4, 0, NULL, 0),
SND_SOC_DAPM_PGA("Left Input", WM8961_PWR_MGMT_1, 5, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right Input", WM8961_PWR_MGMT_1, 4, 0, NULL, 0),
SND_SOC_DAPM_ADC("ADCL", "HiFi Capture", WM8961_PWR_MGMT_1, 3, 0),
SND_SOC_DAPM_ADC("ADCR", "HiFi Capture", WM8961_PWR_MGMT_1, 2, 0),
SND_SOC_DAPM_MICBIAS("MICBIAS", WM8961_PWR_MGMT_1, 1, 0),
SND_SOC_DAPM_MUX("DACL Sidetone", SND_SOC_NOPM, 0, 0, &dacl_mux),
SND_SOC_DAPM_MUX("DACR Sidetone", SND_SOC_NOPM, 0, 0, &dacr_mux),
SND_SOC_DAPM_DAC("DACL", "HiFi Playback", WM8961_PWR_MGMT_2, 8, 0),
SND_SOC_DAPM_DAC("DACR", "HiFi Playback", WM8961_PWR_MGMT_2, 7, 0),
/* Handle as a mono path for DCS */
SND_SOC_DAPM_PGA_E("Headphone Output", SND_SOC_NOPM,
4, 0, NULL, 0, wm8961_hp_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
SND_SOC_DAPM_PGA_E("Speaker Output", SND_SOC_NOPM,
4, 0, NULL, 0, wm8961_spk_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
SND_SOC_DAPM_OUTPUT("HP_L"),
SND_SOC_DAPM_OUTPUT("HP_R"),
SND_SOC_DAPM_OUTPUT("SPK_LN"),
SND_SOC_DAPM_OUTPUT("SPK_LP"),
SND_SOC_DAPM_OUTPUT("SPK_RN"),
SND_SOC_DAPM_OUTPUT("SPK_RP"),
};
static const struct snd_soc_dapm_route audio_paths[] = {
{ "DACL", NULL, "CLK_DSP" },
{ "DACL", NULL, "DACL Sidetone" },
{ "DACR", NULL, "CLK_DSP" },
{ "DACR", NULL, "DACR Sidetone" },
{ "DACL Sidetone", "Left", "ADCL" },
{ "DACL Sidetone", "Right", "ADCR" },
{ "DACR Sidetone", "Left", "ADCL" },
{ "DACR Sidetone", "Right", "ADCR" },
{ "HP_L", NULL, "Headphone Output" },
{ "HP_R", NULL, "Headphone Output" },
{ "Headphone Output", NULL, "DACL" },
{ "Headphone Output", NULL, "DACR" },
{ "SPK_LN", NULL, "Speaker Output" },
{ "SPK_LP", NULL, "Speaker Output" },
{ "SPK_RN", NULL, "Speaker Output" },
{ "SPK_RP", NULL, "Speaker Output" },
{ "Speaker Output", NULL, "DACL" },
{ "Speaker Output", NULL, "DACR" },
{ "ADCL", NULL, "Left Input" },
{ "ADCL", NULL, "CLK_DSP" },
{ "ADCR", NULL, "Right Input" },
{ "ADCR", NULL, "CLK_DSP" },
{ "Left Input", NULL, "LINPUT" },
{ "Right Input", NULL, "RINPUT" },
};
/* Values for CLK_SYS_RATE */
static struct {
int ratio;
u16 val;
} wm8961_clk_sys_ratio[] = {
{ 64, 0 },
{ 128, 1 },
{ 192, 2 },
{ 256, 3 },
{ 384, 4 },
{ 512, 5 },
{ 768, 6 },
{ 1024, 7 },
{ 1408, 8 },
{ 1536, 9 },
};
/* Values for SAMPLE_RATE */
static struct {
int rate;
u16 val;
} wm8961_srate[] = {
{ 48000, 0 },
{ 44100, 0 },
{ 32000, 1 },
{ 22050, 2 },
{ 24000, 2 },
{ 16000, 3 },
{ 11250, 4 },
{ 12000, 4 },
{ 8000, 5 },
};
static int wm8961_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;
struct wm8961_priv *wm8961 = codec->private_data;
int i, best, target, fs;
u16 reg;
fs = params_rate(params);
if (!wm8961->sysclk) {
dev_err(codec->dev, "MCLK has not been specified\n");
return -EINVAL;
}
/* Find the closest sample rate for the filters */
best = 0;
for (i = 0; i < ARRAY_SIZE(wm8961_srate); i++) {
if (abs(wm8961_srate[i].rate - fs) <
abs(wm8961_srate[best].rate - fs))
best = i;
}
reg = wm8961_read(codec, WM8961_ADDITIONAL_CONTROL_3);
reg &= ~WM8961_SAMPLE_RATE_MASK;
reg |= wm8961_srate[best].val;
wm8961_write(codec, WM8961_ADDITIONAL_CONTROL_3, reg);
dev_dbg(codec->dev, "Selected SRATE %dHz for %dHz\n",
wm8961_srate[best].rate, fs);
/* Select a CLK_SYS/fs ratio equal to or higher than required */
target = wm8961->sysclk / fs;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && target < 64) {
dev_err(codec->dev,
"SYSCLK must be at least 64*fs for DAC\n");
return -EINVAL;
}
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE && target < 256) {
dev_err(codec->dev,
"SYSCLK must be at least 256*fs for ADC\n");
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(wm8961_clk_sys_ratio); i++) {
if (wm8961_clk_sys_ratio[i].ratio >= target)
break;
}
if (i == ARRAY_SIZE(wm8961_clk_sys_ratio)) {
dev_err(codec->dev, "Unable to generate CLK_SYS_RATE\n");
return -EINVAL;
}
dev_dbg(codec->dev, "Selected CLK_SYS_RATE of %d for %d/%d=%d\n",
wm8961_clk_sys_ratio[i].ratio, wm8961->sysclk, fs,
wm8961->sysclk / fs);
reg = wm8961_read(codec, WM8961_CLOCKING_4);
reg &= ~WM8961_CLK_SYS_RATE_MASK;
reg |= wm8961_clk_sys_ratio[i].val << WM8961_CLK_SYS_RATE_SHIFT;
wm8961_write(codec, WM8961_CLOCKING_4, reg);
reg = wm8961_read(codec, WM8961_AUDIO_INTERFACE_0);
reg &= ~WM8961_WL_MASK;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
break;
case SNDRV_PCM_FORMAT_S20_3LE:
reg |= 1 << WM8961_WL_SHIFT;
break;
case SNDRV_PCM_FORMAT_S24_LE:
reg |= 2 << WM8961_WL_SHIFT;
break;
case SNDRV_PCM_FORMAT_S32_LE:
reg |= 3 << WM8961_WL_SHIFT;
break;
default:
return -EINVAL;
}
wm8961_write(codec, WM8961_AUDIO_INTERFACE_0, reg);
/* Sloping stop-band filter is recommended for <= 24kHz */
reg = wm8961_read(codec, WM8961_ADC_DAC_CONTROL_2);
if (fs <= 24000)
reg |= WM8961_DACSLOPE;
else
reg &= WM8961_DACSLOPE;
wm8961_write(codec, WM8961_ADC_DAC_CONTROL_2, reg);
return 0;
}
static int wm8961_set_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq,
int dir)
{
struct snd_soc_codec *codec = dai->codec;
struct wm8961_priv *wm8961 = codec->private_data;
u16 reg = wm8961_read(codec, WM8961_CLOCKING1);
if (freq > 33000000) {
dev_err(codec->dev, "MCLK must be <33MHz\n");
return -EINVAL;
}
if (freq > 16500000) {
dev_dbg(codec->dev, "Using MCLK/2 for %dHz MCLK\n", freq);
reg |= WM8961_MCLKDIV;
freq /= 2;
} else {
dev_dbg(codec->dev, "Using MCLK/1 for %dHz MCLK\n", freq);
reg &= WM8961_MCLKDIV;
}
wm8961_write(codec, WM8961_CLOCKING1, reg);
wm8961->sysclk = freq;
return 0;
}
static int wm8961_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct snd_soc_codec *codec = dai->codec;
u16 aif = wm8961_read(codec, WM8961_AUDIO_INTERFACE_0);
aif &= ~(WM8961_BCLKINV | WM8961_LRP |
WM8961_MS | WM8961_FORMAT_MASK);
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
aif |= WM8961_MS;
break;
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_LEFT_J:
aif |= 1;
break;
case SND_SOC_DAIFMT_I2S:
aif |= 2;
break;
case SND_SOC_DAIFMT_DSP_B:
aif |= WM8961_LRP;
case SND_SOC_DAIFMT_DSP_A:
aif |= 3;
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
case SND_SOC_DAIFMT_IB_NF:
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_NB_IF:
aif |= WM8961_LRP;
break;
case SND_SOC_DAIFMT_IB_NF:
aif |= WM8961_BCLKINV;
break;
case SND_SOC_DAIFMT_IB_IF:
aif |= WM8961_BCLKINV | WM8961_LRP;
break;
default:
return -EINVAL;
}
return wm8961_write(codec, WM8961_AUDIO_INTERFACE_0, aif);
}
static int wm8961_set_tristate(struct snd_soc_dai *dai, int tristate)
{
struct snd_soc_codec *codec = dai->codec;
u16 reg = wm8961_read(codec, WM8961_ADDITIONAL_CONTROL_2);
if (tristate)
reg |= WM8961_TRIS;
else
reg &= ~WM8961_TRIS;
return wm8961_write(codec, WM8961_ADDITIONAL_CONTROL_2, reg);
}
static int wm8961_digital_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
u16 reg = wm8961_read(codec, WM8961_ADC_DAC_CONTROL_1);
if (mute)
reg |= WM8961_DACMU;
else
reg &= ~WM8961_DACMU;
msleep(17);
return wm8961_write(codec, WM8961_ADC_DAC_CONTROL_1, reg);
}
static int wm8961_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
{
struct snd_soc_codec *codec = dai->codec;
u16 reg;
switch (div_id) {
case WM8961_BCLK:
reg = wm8961_read(codec, WM8961_CLOCKING2);
reg &= ~WM8961_BCLKDIV_MASK;
reg |= div;
wm8961_write(codec, WM8961_CLOCKING2, reg);
break;
case WM8961_LRCLK:
reg = wm8961_read(codec, WM8961_AUDIO_INTERFACE_2);
reg &= ~WM8961_LRCLK_RATE_MASK;
reg |= div;
wm8961_write(codec, WM8961_AUDIO_INTERFACE_2, reg);
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8961_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
u16 reg;
/* This is all slightly unusual since we have no bypass paths
* and the output amplifier structure means we can just slam
* the biases straight up rather than having to ramp them
* slowly.
*/
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
if (codec->bias_level == SND_SOC_BIAS_STANDBY) {
/* Enable bias generation */
reg = wm8961_read(codec, WM8961_ANTI_POP);
reg |= WM8961_BUFIOEN | WM8961_BUFDCOPEN;
wm8961_write(codec, WM8961_ANTI_POP, reg);
/* VMID=2*50k, VREF */
reg = wm8961_read(codec, WM8961_PWR_MGMT_1);
reg &= ~WM8961_VMIDSEL_MASK;
reg |= (1 << WM8961_VMIDSEL_SHIFT) | WM8961_VREF;
wm8961_write(codec, WM8961_PWR_MGMT_1, reg);
}
break;
case SND_SOC_BIAS_STANDBY:
if (codec->bias_level == SND_SOC_BIAS_PREPARE) {
/* VREF off */
reg = wm8961_read(codec, WM8961_PWR_MGMT_1);
reg &= ~WM8961_VREF;
wm8961_write(codec, WM8961_PWR_MGMT_1, reg);
/* Bias generation off */
reg = wm8961_read(codec, WM8961_ANTI_POP);
reg &= ~(WM8961_BUFIOEN | WM8961_BUFDCOPEN);
wm8961_write(codec, WM8961_ANTI_POP, reg);
/* VMID off */
reg = wm8961_read(codec, WM8961_PWR_MGMT_1);
reg &= ~WM8961_VMIDSEL_MASK;
wm8961_write(codec, WM8961_PWR_MGMT_1, reg);
}
break;
case SND_SOC_BIAS_OFF:
break;
}
codec->bias_level = level;
return 0;
}
#define WM8961_RATES SNDRV_PCM_RATE_8000_48000
#define WM8961_FORMATS \
(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
SNDRV_PCM_FMTBIT_S24_LE)
static struct snd_soc_dai_ops wm8961_dai_ops = {
.hw_params = wm8961_hw_params,
.set_sysclk = wm8961_set_sysclk,
.set_fmt = wm8961_set_fmt,
.digital_mute = wm8961_digital_mute,
.set_tristate = wm8961_set_tristate,
.set_clkdiv = wm8961_set_clkdiv,
};
struct snd_soc_dai wm8961_dai = {
.name = "WM8961",
.playback = {
.stream_name = "HiFi Playback",
.channels_min = 1,
.channels_max = 2,
.rates = WM8961_RATES,
.formats = WM8961_FORMATS,},
.capture = {
.stream_name = "HiFi Capture",
.channels_min = 1,
.channels_max = 2,
.rates = WM8961_RATES,
.formats = WM8961_FORMATS,},
.ops = &wm8961_dai_ops,
};
EXPORT_SYMBOL_GPL(wm8961_dai);
static struct snd_soc_codec *wm8961_codec;
static int wm8961_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
int ret = 0;
if (wm8961_codec == NULL) {
dev_err(&pdev->dev, "Codec device not registered\n");
return -ENODEV;
}
socdev->card->codec = wm8961_codec;
codec = wm8961_codec;
/* register pcms */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
dev_err(codec->dev, "failed to create pcms: %d\n", ret);
goto pcm_err;
}
snd_soc_add_controls(codec, wm8961_snd_controls,
ARRAY_SIZE(wm8961_snd_controls));
snd_soc_dapm_new_controls(codec, wm8961_dapm_widgets,
ARRAY_SIZE(wm8961_dapm_widgets));
snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
snd_soc_dapm_new_widgets(codec);
ret = snd_soc_init_card(socdev);
if (ret < 0) {
dev_err(codec->dev, "failed to register card: %d\n", ret);
goto card_err;
}
return ret;
card_err:
snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);
pcm_err:
return ret;
}
static int wm8961_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);
return 0;
}
#ifdef CONFIG_PM
static int wm8961_suspend(struct platform_device *pdev, pm_message_t state)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
wm8961_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static int wm8961_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
u16 *reg_cache = codec->reg_cache;
int i;
for (i = 0; i < codec->reg_cache_size; i++) {
if (i == WM8961_SOFTWARE_RESET)
continue;
wm8961_write(codec, i, reg_cache[i]);
}
wm8961_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
return 0;
}
#else
#define wm8961_suspend NULL
#define wm8961_resume NULL
#endif
struct snd_soc_codec_device soc_codec_dev_wm8961 = {
.probe = wm8961_probe,
.remove = wm8961_remove,
.suspend = wm8961_suspend,
.resume = wm8961_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8961);
static int wm8961_register(struct wm8961_priv *wm8961)
{
struct snd_soc_codec *codec = &wm8961->codec;
int ret;
u16 reg;
if (wm8961_codec) {
dev_err(codec->dev, "Another WM8961 is registered\n");
ret = -EINVAL;
goto err;
}
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->private_data = wm8961;
codec->name = "WM8961";
codec->owner = THIS_MODULE;
codec->read = wm8961_read;
codec->write = wm8961_write;
codec->dai = &wm8961_dai;
codec->num_dai = 1;
codec->reg_cache_size = ARRAY_SIZE(wm8961->reg_cache);
codec->reg_cache = &wm8961->reg_cache;
codec->bias_level = SND_SOC_BIAS_OFF;
codec->set_bias_level = wm8961_set_bias_level;
memcpy(codec->reg_cache, wm8961_reg_defaults,
sizeof(wm8961_reg_defaults));
reg = wm8961_read_hw(codec, WM8961_SOFTWARE_RESET);
if (reg != 0x1801) {
dev_err(codec->dev, "Device is not a WM8961: ID=0x%x\n", reg);
ret = -EINVAL;
goto err;
}
reg = wm8961_read_hw(codec, WM8961_RIGHT_INPUT_VOLUME);
dev_info(codec->dev, "WM8961 family %d revision %c\n",
(reg & WM8961_DEVICE_ID_MASK) >> WM8961_DEVICE_ID_SHIFT,
((reg & WM8961_CHIP_REV_MASK) >> WM8961_CHIP_REV_SHIFT)
+ 'A');
ret = wm8961_reset(codec);
if (ret < 0) {
dev_err(codec->dev, "Failed to issue reset\n");
return ret;
}
/* Enable class W */
reg = wm8961_read(codec, WM8961_CHARGE_PUMP_B);
reg |= WM8961_CP_DYN_PWR_MASK;
wm8961_write(codec, WM8961_CHARGE_PUMP_B, reg);
/* Latch volume update bits (right channel only, we always
* write both out) and default ZC on. */
reg = wm8961_read(codec, WM8961_ROUT1_VOLUME);
wm8961_write(codec, WM8961_ROUT1_VOLUME,
reg | WM8961_LO1ZC | WM8961_OUT1VU);
wm8961_write(codec, WM8961_LOUT1_VOLUME, reg | WM8961_LO1ZC);
reg = wm8961_read(codec, WM8961_ROUT2_VOLUME);
wm8961_write(codec, WM8961_ROUT2_VOLUME,
reg | WM8961_SPKRZC | WM8961_SPKVU);
wm8961_write(codec, WM8961_LOUT2_VOLUME, reg | WM8961_SPKLZC);
reg = wm8961_read(codec, WM8961_RIGHT_ADC_VOLUME);
wm8961_write(codec, WM8961_RIGHT_ADC_VOLUME, reg | WM8961_ADCVU);
reg = wm8961_read(codec, WM8961_RIGHT_INPUT_VOLUME);
wm8961_write(codec, WM8961_RIGHT_INPUT_VOLUME, reg | WM8961_IPVU);
/* Use soft mute by default */
reg = wm8961_read(codec, WM8961_ADC_DAC_CONTROL_2);
reg |= WM8961_DACSMM;
wm8961_write(codec, WM8961_ADC_DAC_CONTROL_2, reg);
/* Use automatic clocking mode by default; for now this is all
* we support.
*/
reg = wm8961_read(codec, WM8961_CLOCKING_3);
reg &= ~WM8961_MANUAL_MODE;
wm8961_write(codec, WM8961_CLOCKING_3, reg);
wm8961_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
wm8961_dai.dev = codec->dev;
wm8961_codec = codec;
ret = snd_soc_register_codec(codec);
if (ret != 0) {
dev_err(codec->dev, "Failed to register codec: %d\n", ret);
return ret;
}
ret = snd_soc_register_dai(&wm8961_dai);
if (ret != 0) {
dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
snd_soc_unregister_codec(codec);
return ret;
}
return 0;
err:
kfree(wm8961);
return ret;
}
static void wm8961_unregister(struct wm8961_priv *wm8961)
{
wm8961_set_bias_level(&wm8961->codec, SND_SOC_BIAS_OFF);
snd_soc_unregister_dai(&wm8961_dai);
snd_soc_unregister_codec(&wm8961->codec);
kfree(wm8961);
wm8961_codec = NULL;
}
static __devinit int wm8961_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8961_priv *wm8961;
struct snd_soc_codec *codec;
wm8961 = kzalloc(sizeof(struct wm8961_priv), GFP_KERNEL);
if (wm8961 == NULL)
return -ENOMEM;
codec = &wm8961->codec;
codec->hw_write = (hw_write_t)i2c_master_send;
i2c_set_clientdata(i2c, wm8961);
codec->control_data = i2c;
codec->dev = &i2c->dev;
return wm8961_register(wm8961);
}
static __devexit int wm8961_i2c_remove(struct i2c_client *client)
{
struct wm8961_priv *wm8961 = i2c_get_clientdata(client);
wm8961_unregister(wm8961);
return 0;
}
ASoC: Add core suspend and resume callbacks to WM8961 Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-25 16:57:59 +04:00
#ifdef CONFIG_PM
ASoC: Fix WM8961 suspend function type Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-29 19:29:06 +04:00
static int wm8961_i2c_suspend(struct i2c_client *client, pm_message_t state)
ASoC: Add core suspend and resume callbacks to WM8961 Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-25 16:57:59 +04:00
{
return snd_soc_suspend_device(&client->dev);
}
static int wm8961_i2c_resume(struct i2c_client *client)
{
return snd_soc_resume_device(&client->dev);
}
#else
#define wm8961_i2c_suspend NULL
#define wm8961_i2c_resume NULL
#endif
ASoC: Add WM8961 driver The WM8961 is a low power, high quality stereo CODEC designed for portable digital applications with headphone and stereo class D speaker drivers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-09 12:55:51 +04:00
static const struct i2c_device_id wm8961_i2c_id[] = {
{ "wm8961", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8961_i2c_id);
static struct i2c_driver wm8961_i2c_driver = {
.driver = {
.name = "wm8961",
.owner = THIS_MODULE,
},
.probe = wm8961_i2c_probe,
.remove = __devexit_p(wm8961_i2c_remove),
ASoC: Add core suspend and resume callbacks to WM8961 Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-25 16:57:59 +04:00
.suspend = wm8961_i2c_suspend,
.resume = wm8961_i2c_resume,
ASoC: Add WM8961 driver The WM8961 is a low power, high quality stereo CODEC designed for portable digital applications with headphone and stereo class D speaker drivers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-06-09 12:55:51 +04:00
.id_table = wm8961_i2c_id,
};
static int __init wm8961_modinit(void)
{
int ret;
ret = i2c_add_driver(&wm8961_i2c_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register WM8961 I2C driver: %d\n",
ret);
}
return ret;
}
module_init(wm8961_modinit);
static void __exit wm8961_exit(void)
{
i2c_del_driver(&wm8961_i2c_driver);
}
module_exit(wm8961_exit);
MODULE_DESCRIPTION("ASoC WM8961 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
Reference in New Issue Copy Permalink