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ASoC: Add PCM3008 ALSA SoC driver
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The PCM3008 is a 16-bit stereo audio codec. It accepts
left-justified format for ADC, and right-justified format
for DAC. Independent power-down modes for ADC and DAC are
provided, as well as a digital de-emphasis filter (4 modes).

[Merged Makefile & Kconfig, changed asm/gpio.h to linux/gpio.h -- broonie]

Signed-off-by: Hugo Villeneuve <hugo@hugovil.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Hugo Villeneuve authored and Mark Brown committed Nov 19, 2008
1 parent ca3ea02 commit 1c0090c
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Showing 4 changed files with 232 additions and 0 deletions.
4 changes: 4 additions & 0 deletions sound/soc/codecs/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_AD73311 if I2C
select SND_SOC_AK4535 if I2C
select SND_SOC_CS4270 if I2C
select SND_SOC_PCM3008
select SND_SOC_SSM2602 if I2C
select SND_SOC_TLV320AIC23 if I2C
select SND_SOC_TLV320AIC26 if SPI_MASTER
Expand Down Expand Up @@ -70,6 +71,9 @@ config SND_SOC_CS4270_VD33_ERRATA
config SND_SOC_L3
tristate

config SND_SOC_PCM3008
tristate

config SND_SOC_SSM2602
tristate

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2 changes: 2 additions & 0 deletions sound/soc/codecs/Makefile
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Expand Up @@ -4,6 +4,7 @@ snd-soc-ad73311-objs := ad73311.o
snd-soc-ak4535-objs := ak4535.o
snd-soc-cs4270-objs := cs4270.o
snd-soc-l3-objs := l3.o
snd-soc-pcm3008-objs := pcm3008.o
snd-soc-ssm2602-objs := ssm2602.o
snd-soc-tlv320aic23-objs := tlv320aic23.o
snd-soc-tlv320aic26-objs := tlv320aic26.o
Expand All @@ -30,6 +31,7 @@ obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
obj-$(CONFIG_SND_SOC_CS4270) += snd-soc-cs4270.o
obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o
obj-$(CONFIG_SND_SOC_PCM3008) += snd-soc-pcm3008.o
obj-$(CONFIG_SND_SOC_SSM2602) += snd-soc-ssm2602.o
obj-$(CONFIG_SND_SOC_TLV320AIC23) += snd-soc-tlv320aic23.o
obj-$(CONFIG_SND_SOC_TLV320AIC26) += snd-soc-tlv320aic26.o
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201 changes: 201 additions & 0 deletions sound/soc/codecs/pcm3008.c
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@@ -0,0 +1,201 @@
/*
* ALSA Soc PCM3008 codec support
*
* Author: Hugo Villeneuve
* Copyright (C) 2008 Lyrtech inc
*
* Based on AC97 Soc codec, original copyright follow:
* Copyright 2005 Wolfson Microelectronics PLC.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* Generic PCM3008 support.
*/

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "pcm3008.h"

#define PCM3008_VERSION "0.2"

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000)

struct snd_soc_dai pcm3008_dai = {
.name = "PCM3008 HiFi",
.type = SND_SOC_DAI_I2S,
.playback = {
.stream_name = "PCM3008 Playback",
.channels_min = 1,
.channels_max = 2,
.rates = PCM3008_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.stream_name = "PCM3008 Capture",
.channels_min = 1,
.channels_max = 2,
.rates = PCM3008_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
};
EXPORT_SYMBOL_GPL(pcm3008_dai);

static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
{
gpio_free(setup->dem0_pin);
gpio_free(setup->dem1_pin);
gpio_free(setup->pdad_pin);
gpio_free(setup->pdda_pin);
}

static int pcm3008_soc_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
struct pcm3008_setup_data *setup = socdev->codec_data;
int ret = 0;

printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);

socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (!socdev->codec)
return -ENOMEM;

codec = socdev->codec;
mutex_init(&codec->mutex);

codec->name = "PCM3008";
codec->owner = THIS_MODULE;
codec->dai = &pcm3008_dai;
codec->num_dai = 1;
codec->write = NULL;
codec->read = NULL;
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);

/* Register PCMs. */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
printk(KERN_ERR "pcm3008: failed to create pcms\n");
goto pcm_err;
}

/* Register Card. */
ret = snd_soc_register_card(socdev);
if (ret < 0) {
printk(KERN_ERR "pcm3008: failed to register card\n");
goto card_err;
}

/* DEM1 DEM0 DE-EMPHASIS_MODE
* Low Low De-emphasis 44.1 kHz ON
* Low High De-emphasis OFF
* High Low De-emphasis 48 kHz ON
* High High De-emphasis 32 kHz ON
*/

/* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
ret = gpio_request(setup->dem0_pin, "codec_dem0");
if (ret == 0)
ret = gpio_direction_output(setup->dem0_pin, 1);
if (ret != 0)
goto gpio_err;

/* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
ret = gpio_request(setup->dem1_pin, "codec_dem1");
if (ret == 0)
ret = gpio_direction_output(setup->dem1_pin, 0);
if (ret != 0)
goto gpio_err;

/* Configure PDAD GPIO. */
ret = gpio_request(setup->pdad_pin, "codec_pdad");
if (ret == 0)
ret = gpio_direction_output(setup->pdad_pin, 1);
if (ret != 0)
goto gpio_err;

/* Configure PDDA GPIO. */
ret = gpio_request(setup->pdda_pin, "codec_pdda");
if (ret == 0)
ret = gpio_direction_output(setup->pdda_pin, 1);
if (ret != 0)
goto gpio_err;

return ret;

gpio_err:
pcm3008_gpio_free(setup);
card_err:
snd_soc_free_pcms(socdev);
pcm_err:
kfree(socdev->codec);

return ret;
}

static int pcm3008_soc_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->codec;
struct pcm3008_setup_data *setup = socdev->codec_data;

if (!codec)
return 0;

pcm3008_gpio_free(setup);
snd_soc_free_pcms(socdev);
kfree(socdev->codec);

return 0;
}

#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct pcm3008_setup_data *setup = socdev->codec_data;

gpio_set_value(setup->pdad_pin, 0);
gpio_set_value(setup->pdda_pin, 0);

return 0;
}

static int pcm3008_soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct pcm3008_setup_data *setup = socdev->codec_data;

gpio_set_value(setup->pdad_pin, 1);
gpio_set_value(setup->pdda_pin, 1);

return 0;
}
#else
#define pcm3008_soc_suspend NULL
#define pcm3008_soc_resume NULL
#endif

struct snd_soc_codec_device soc_codec_dev_pcm3008 = {
.probe = pcm3008_soc_probe,
.remove = pcm3008_soc_remove,
.suspend = pcm3008_soc_suspend,
.resume = pcm3008_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_pcm3008);

MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");
25 changes: 25 additions & 0 deletions sound/soc/codecs/pcm3008.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
/*
* PCM3008 ALSA SoC Layer
*
* Author: Hugo Villeneuve
* Copyright (C) 2008 Lyrtech inc
*
* 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.
*/

#ifndef __LINUX_SND_SOC_PCM3008_H
#define __LINUX_SND_SOC_PCM3008_H

struct pcm3008_setup_data {
unsigned dem0_pin;
unsigned dem1_pin;
unsigned pdad_pin;
unsigned pdda_pin;
};

extern struct snd_soc_codec_device soc_codec_dev_pcm3008;
extern struct snd_soc_dai pcm3008_dai;

#endif

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