6ad709482e
CODECs without any outputs now remain powered down, which means any paths to these codecs also remain powered down. Add an always-enabled output pin widget to the spdif transceiver codec. This enables DAPM to correctly identify that the spdif transceiver is in use when playback is enabled, which will then allow DAPM to power up any links from the CPU DAI to the S/PDIF transceiver. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Mark Brown <broonie@linaro.org>
94 lines
2.4 KiB
C
94 lines
2.4 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 <linux/of.h>
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#define DRV_NAME "spdif-dit"
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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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SNDRV_PCM_FMTBIT_S20_3LE | \
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SNDRV_PCM_FMTBIT_S24_LE)
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static const struct snd_soc_dapm_widget dit_widgets[] = {
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SND_SOC_DAPM_OUTPUT("spdif-out"),
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};
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static const const struct snd_soc_dapm_route dit_routes[] = {
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{ "spdif-out", NULL, "Playback" },
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};
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static struct snd_soc_codec_driver soc_codec_spdif_dit = {
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.dapm_widgets = dit_widgets,
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.num_dapm_widgets = ARRAY_SIZE(dit_widgets),
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.dapm_routes = dit_routes,
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.num_dapm_routes = ARRAY_SIZE(dit_routes),
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};
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static struct snd_soc_dai_driver dit_stub_dai = {
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.name = "dit-hifi",
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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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static int spdif_dit_probe(struct platform_device *pdev)
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{
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return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
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&dit_stub_dai, 1);
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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_codec(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id spdif_dit_dt_ids[] = {
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{ .compatible = "linux,spdif-dit", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
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#endif
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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 = DRV_NAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(spdif_dit_dt_ids),
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},
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};
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module_platform_driver(spdif_dit_driver);
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MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
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MODULE_DESCRIPTION("SPDIF dummy codec driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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