2de1a8b1a9
The Greybus audio source files included no copyright statements. Add them. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
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* Greybus audio Digital Audio Interface (DAI) driver
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*
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* Copyright 2015 Google Inc.
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* Copyright 2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/i2c.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/simple_card.h>
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#include "greybus.h"
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#include "audio.h"
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/*
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* This is the greybus cpu dai logic. It really doesn't do much
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* other then provide the TRIGGER_START/STOP hooks that start
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* and stop the timer sending audio data in the pcm logic.
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*/
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static int gb_dai_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct gb_snd *snd_dev;
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snd_dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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gb_pcm_hrtimer_start(snd_dev);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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gb_pcm_hrtimer_stop(snd_dev);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/*
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* XXX This is annoying, if we don't have a set_fmt function
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* the subsystem returns -ENOTSUPP, which causes applications
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* to fail, so add a dummy function here.
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*/
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static int gb_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
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{
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return 0;
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}
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static const struct snd_soc_dai_ops gb_dai_ops = {
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.trigger = gb_dai_trigger,
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.set_fmt = gb_dai_set_fmt,
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};
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static struct snd_soc_dai_driver gb_cpu_dai = {
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.name = "gb-cpu-dai",
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.playback = {
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.rates = GB_RATES,
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.formats = GB_FMTS,
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.channels_min = 1,
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.channels_max = 2,
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},
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.ops = &gb_dai_ops,
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};
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static const struct snd_soc_component_driver gb_soc_component = {
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.name = "gb-component",
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};
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static int gb_plat_probe(struct platform_device *pdev)
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{
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struct gb_snd *snd_dev;
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int ret;
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snd_dev = (struct gb_snd *)pdev->dev.platform_data;
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dev_set_drvdata(&pdev->dev, snd_dev);
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ret = snd_soc_register_component(&pdev->dev, &gb_soc_component,
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&gb_cpu_dai, 1);
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return ret;
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}
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static int gb_plat_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_component(&pdev->dev);
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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struct platform_driver gb_audio_plat_driver = {
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.driver = {
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.name = "gb-dai-audio",
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},
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.probe = gb_plat_probe,
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.remove = gb_plat_remove,
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};
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