180 lines
4.2 KiB
C
180 lines
4.2 KiB
C
/*
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* ALSA Soc PCM3008 codec support
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*
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* Author: Hugo Villeneuve
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* Copyright (C) 2008 Lyrtech inc
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*
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* Based on AC97 Soc codec, original copyright follow:
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* Copyright 2005 Wolfson Microelectronics PLC.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Generic PCM3008 support.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include "pcm3008.h"
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#define PCM3008_VERSION "0.2"
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#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
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SNDRV_PCM_RATE_48000)
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static struct snd_soc_dai_driver pcm3008_dai = {
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.name = "pcm3008-hifi",
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.playback = {
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.stream_name = "PCM3008 Playback",
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.channels_min = 1,
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.channels_max = 2,
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.rates = PCM3008_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.capture = {
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.stream_name = "PCM3008 Capture",
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.channels_min = 1,
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.channels_max = 2,
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.rates = PCM3008_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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};
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static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
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{
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gpio_free(setup->dem0_pin);
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gpio_free(setup->dem1_pin);
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gpio_free(setup->pdad_pin);
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gpio_free(setup->pdda_pin);
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}
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static int pcm3008_soc_probe(struct snd_soc_codec *codec)
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{
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struct pcm3008_setup_data *setup = codec->dev->platform_data;
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int ret = 0;
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printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);
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/* DEM1 DEM0 DE-EMPHASIS_MODE
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* Low Low De-emphasis 44.1 kHz ON
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* Low High De-emphasis OFF
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* High Low De-emphasis 48 kHz ON
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* High High De-emphasis 32 kHz ON
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*/
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/* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
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ret = gpio_request(setup->dem0_pin, "codec_dem0");
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if (ret == 0)
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ret = gpio_direction_output(setup->dem0_pin, 1);
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if (ret != 0)
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goto gpio_err;
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/* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
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ret = gpio_request(setup->dem1_pin, "codec_dem1");
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if (ret == 0)
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ret = gpio_direction_output(setup->dem1_pin, 0);
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if (ret != 0)
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goto gpio_err;
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/* Configure PDAD GPIO. */
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ret = gpio_request(setup->pdad_pin, "codec_pdad");
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if (ret == 0)
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ret = gpio_direction_output(setup->pdad_pin, 1);
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if (ret != 0)
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goto gpio_err;
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/* Configure PDDA GPIO. */
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ret = gpio_request(setup->pdda_pin, "codec_pdda");
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if (ret == 0)
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ret = gpio_direction_output(setup->pdda_pin, 1);
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if (ret != 0)
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goto gpio_err;
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return ret;
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gpio_err:
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pcm3008_gpio_free(setup);
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return ret;
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}
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static int pcm3008_soc_remove(struct snd_soc_codec *codec)
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{
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struct pcm3008_setup_data *setup = codec->dev->platform_data;
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pcm3008_gpio_free(setup);
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return 0;
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}
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#ifdef CONFIG_PM
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static int pcm3008_soc_suspend(struct snd_soc_codec *codec)
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{
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struct pcm3008_setup_data *setup = codec->dev->platform_data;
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gpio_set_value(setup->pdad_pin, 0);
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gpio_set_value(setup->pdda_pin, 0);
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return 0;
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}
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static int pcm3008_soc_resume(struct snd_soc_codec *codec)
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{
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struct pcm3008_setup_data *setup = codec->dev->platform_data;
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gpio_set_value(setup->pdad_pin, 1);
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gpio_set_value(setup->pdda_pin, 1);
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return 0;
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}
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#else
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#define pcm3008_soc_suspend NULL
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#define pcm3008_soc_resume NULL
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#endif
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static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
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.probe = pcm3008_soc_probe,
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.remove = pcm3008_soc_remove,
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.suspend = pcm3008_soc_suspend,
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.resume = pcm3008_soc_resume,
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};
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static int pcm3008_codec_probe(struct platform_device *pdev)
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{
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return snd_soc_register_codec(&pdev->dev,
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&soc_codec_dev_pcm3008, &pcm3008_dai, 1);
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}
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static int pcm3008_codec_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_codec(&pdev->dev);
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return 0;
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}
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MODULE_ALIAS("platform:pcm3008-codec");
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static struct platform_driver pcm3008_codec_driver = {
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.probe = pcm3008_codec_probe,
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.remove = pcm3008_codec_remove,
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.driver = {
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.name = "pcm3008-codec",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(pcm3008_codec_driver);
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MODULE_DESCRIPTION("Soc PCM3008 driver");
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MODULE_AUTHOR("Hugo Villeneuve");
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MODULE_LICENSE("GPL");
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