167 lines
3.7 KiB
C
167 lines
3.7 KiB
C
/*
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* ALSA SoC SPDIF DIT driver
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*
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* This driver is used by controllers which can operate in DIT (SPDI/F) where
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* no codec is needed. This file provides stub codec that can be used
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* in these configurations. TI DaVinci Audio controller uses this driver.
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*
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* Author: Steve Chen, <schen@mvista.com>
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* Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com>
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* Copyright: (C) 2009 Texas Instruments, India
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <sound/soc.h>
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#include <sound/pcm.h>
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#include <sound/initval.h>
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#include "spdif_transciever.h"
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MODULE_LICENSE("GPL");
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#define STUB_RATES SNDRV_PCM_RATE_8000_96000
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#define STUB_FORMATS SNDRV_PCM_FMTBIT_S16_LE
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static struct snd_soc_codec *spdif_dit_codec;
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static int spdif_dit_codec_probe(struct platform_device *pdev)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec;
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int ret;
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if (spdif_dit_codec == NULL) {
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dev_err(&pdev->dev, "Codec device not registered\n");
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return -ENODEV;
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}
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socdev->card->codec = spdif_dit_codec;
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codec = spdif_dit_codec;
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ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
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if (ret < 0) {
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dev_err(codec->dev, "failed to create pcms: %d\n", ret);
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goto err_create_pcms;
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}
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return 0;
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err_create_pcms:
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return ret;
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}
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static int spdif_dit_codec_remove(struct platform_device *pdev)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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snd_soc_free_pcms(socdev);
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return 0;
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}
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struct snd_soc_codec_device soc_codec_dev_spdif_dit = {
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.probe = spdif_dit_codec_probe,
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.remove = spdif_dit_codec_remove,
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}; EXPORT_SYMBOL_GPL(soc_codec_dev_spdif_dit);
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struct snd_soc_dai dit_stub_dai = {
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.name = "DIT",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 1,
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.channels_max = 384,
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.rates = STUB_RATES,
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.formats = STUB_FORMATS,
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},
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};
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EXPORT_SYMBOL_GPL(dit_stub_dai);
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static int spdif_dit_probe(struct platform_device *pdev)
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{
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struct snd_soc_codec *codec;
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int ret;
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if (spdif_dit_codec) {
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dev_err(&pdev->dev, "Another Codec is registered\n");
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ret = -EINVAL;
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goto err_reg_codec;
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}
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codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
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if (codec == NULL)
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return -ENOMEM;
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codec->dev = &pdev->dev;
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mutex_init(&codec->mutex);
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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codec->name = "spdif-dit";
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codec->owner = THIS_MODULE;
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codec->dai = &dit_stub_dai;
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codec->num_dai = 1;
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spdif_dit_codec = codec;
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ret = snd_soc_register_codec(codec);
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if (ret < 0) {
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dev_err(codec->dev, "Failed to register codec: %d\n", ret);
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goto err_reg_codec;
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}
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dit_stub_dai.dev = &pdev->dev;
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ret = snd_soc_register_dai(&dit_stub_dai);
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if (ret < 0) {
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dev_err(codec->dev, "Failed to register dai: %d\n", ret);
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goto err_reg_dai;
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}
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return 0;
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err_reg_dai:
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snd_soc_unregister_codec(codec);
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err_reg_codec:
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kfree(spdif_dit_codec);
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return ret;
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}
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static int spdif_dit_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_dai(&dit_stub_dai);
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snd_soc_unregister_codec(spdif_dit_codec);
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kfree(spdif_dit_codec);
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spdif_dit_codec = NULL;
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return 0;
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}
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static struct platform_driver spdif_dit_driver = {
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.probe = spdif_dit_probe,
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.remove = spdif_dit_remove,
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.driver = {
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.name = "spdif-dit",
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.owner = THIS_MODULE,
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},
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};
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static int __init dit_modinit(void)
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{
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return platform_driver_register(&spdif_dit_driver);
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}
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static void __exit dit_exit(void)
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{
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platform_driver_unregister(&spdif_dit_driver);
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}
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module_init(dit_modinit);
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module_exit(dit_exit);
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