/*
* 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",
.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->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (!socdev->card->codec)
return -ENOMEM;
codec = socdev->card->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;
}
/* 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);
pcm_err:
kfree(socdev->card->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->card->codec;
struct pcm3008_setup_data *setup = socdev->codec_data;
if (!codec)
return 0;
pcm3008_gpio_free(setup);
snd_soc_free_pcms(socdev);
kfree(socdev->card->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);
static int __init pcm3008_init(void)
{
return snd_soc_register_dai(&pcm3008_dai);
}
module_init(pcm3008_init);
static void __exit pcm3008_exit(void)
{
snd_soc_unregister_dai(&pcm3008_dai);
}
module_exit(pcm3008_exit);
MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");
