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/*
* 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 <linux/slab.h>
#include <linux/module.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)
static struct snd_soc_dai_driver pcm3008_dai = {
.name = "pcm3008-hifi",
.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,
},
};
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 snd_soc_codec *codec)
{
struct pcm3008_setup_data *setup = codec->dev->platform_data;
int ret = 0;
printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);
/* 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);
return ret;
}
static int pcm3008_soc_remove(struct snd_soc_codec *codec)
{
struct pcm3008_setup_data *setup = codec->dev->platform_data;
pcm3008_gpio_free(setup);
return 0;
}
#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
{
struct pcm3008_setup_data *setup = codec->dev->platform_data;
gpio_set_value(setup->pdad_pin, 0);
gpio_set_value(setup->pdda_pin, 0);
return 0;
}
static int pcm3008_soc_resume(struct snd_soc_codec *codec)
{
struct pcm3008_setup_data *setup = codec->dev->platform_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
static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
.probe = pcm3008_soc_probe,
.remove = pcm3008_soc_remove,
.suspend = pcm3008_soc_suspend,
.resume = pcm3008_soc_resume,
};
static int __devinit pcm3008_codec_probe(struct platform_device *pdev)
{
return snd_soc_register_codec(&pdev->dev,
&soc_codec_dev_pcm3008, &pcm3008_dai, 1);
}
static int __devexit pcm3008_codec_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
MODULE_ALIAS("platform:pcm3008-codec");
static struct platform_driver pcm3008_codec_driver = {
.probe = pcm3008_codec_probe,
.remove = __devexit_p(pcm3008_codec_remove),
.driver = {
.name = "pcm3008-codec",
.owner = THIS_MODULE,
},
};
module_platform_driver(pcm3008_codec_driver);
MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");
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