// SPDX-License-Identifier: GPL-2.0
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//
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// dummy_codec.c -- dummy audio codec for rockchip
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//
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// Copyright (C) 2018 Fuzhou Rockchip Electronics Co., Ltd
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#include <linux/clk.h>
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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 <linux/of.h>
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#include <linux/of_gpio.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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struct dummy_codec_priv {
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struct snd_soc_component *component;
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struct clk *mclk;
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};
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static int dummy_codec_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct dummy_codec_priv *dcp = snd_soc_component_get_drvdata(dai->component);
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if (!IS_ERR(dcp->mclk))
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clk_prepare_enable(dcp->mclk);
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return 0;
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}
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static void dummy_codec_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct dummy_codec_priv *dcp = snd_soc_component_get_drvdata(dai->component);
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if (!IS_ERR(dcp->mclk))
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clk_disable_unprepare(dcp->mclk);
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}
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static struct snd_soc_dai_ops dummy_codec_dai_ops = {
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.startup = dummy_codec_startup,
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.shutdown = dummy_codec_shutdown,
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};
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struct snd_soc_dai_driver dummy_dai = {
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.name = "dummy_codec",
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.playback = {
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.stream_name = "Dummy Playback",
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.channels_min = 1,
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.channels_max = 384,
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.rates = SNDRV_PCM_RATE_8000_384000,
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.formats = (SNDRV_PCM_FMTBIT_S8 |
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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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SNDRV_PCM_FMTBIT_S32_LE),
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},
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.capture = {
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.stream_name = "Dummy Capture",
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.channels_min = 1,
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.channels_max = 384,
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.rates = SNDRV_PCM_RATE_8000_384000,
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.formats = (SNDRV_PCM_FMTBIT_S8 |
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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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SNDRV_PCM_FMTBIT_S32_LE),
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},
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.ops = &dummy_codec_dai_ops,
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};
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static const struct snd_soc_component_driver soc_dummy_codec;
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static int rockchip_dummy_codec_probe(struct platform_device *pdev)
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{
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struct dummy_codec_priv *dcp;
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dcp = devm_kzalloc(&pdev->dev, sizeof(*dcp), GFP_KERNEL);
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if (!dcp)
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return -ENOMEM;
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platform_set_drvdata(pdev, dcp);
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/* optional mclk, if needs, assign mclk in dts node */
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dcp->mclk = devm_clk_get(&pdev->dev, "mclk");
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if (IS_ERR(dcp->mclk)) {
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if (PTR_ERR(dcp->mclk) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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else if (PTR_ERR(dcp->mclk) != -ENOENT)
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return -EINVAL;
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}
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return devm_snd_soc_register_component(&pdev->dev, &soc_dummy_codec,
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&dummy_dai, 1);
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}
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static const struct of_device_id rockchip_dummy_codec_of_match[] = {
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{ .compatible = "rockchip,dummy-codec", },
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{},
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};
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MODULE_DEVICE_TABLE(of, rockchip_dummy_codec_of_match);
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static struct platform_driver rockchip_dummy_codec_driver = {
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.driver = {
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.name = "dummy_codec",
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.of_match_table = of_match_ptr(rockchip_dummy_codec_of_match),
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},
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.probe = rockchip_dummy_codec_probe,
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};
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module_platform_driver(rockchip_dummy_codec_driver);
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MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
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MODULE_DESCRIPTION("Rockchip Dummy Codec Driver");
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MODULE_LICENSE("GPL v2");
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