mirror of https://gitee.com/openkylin/linux.git
153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* ALSA SoC driver for
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* Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
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*
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* (c) 2013 Daniel Mack <zonque@gmail.com>
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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/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_device.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 ak5386_priv {
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int reset_gpio;
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};
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static struct snd_soc_codec_driver soc_codec_ak5386;
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static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
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unsigned int format)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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format &= SND_SOC_DAIFMT_FORMAT_MASK;
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if (format != SND_SOC_DAIFMT_LEFT_J &&
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format != SND_SOC_DAIFMT_I2S) {
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dev_err(codec->dev, "Invalid DAI format\n");
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return -EINVAL;
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}
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return 0;
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}
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static int ak5386_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_codec *codec = dai->codec;
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struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
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/*
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* From the datasheet:
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*
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* All external clocks (MCLK, SCLK and LRCK) must be present unless
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* PDN pin = “L”. If these clocks are not provided, the AK5386 may
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* draw excess current due to its use of internal dynamically
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* refreshed logic. If the external clocks are not present, place
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* the AK5386 in power-down mode (PDN pin = “L”).
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*/
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if (gpio_is_valid(priv->reset_gpio))
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gpio_set_value(priv->reset_gpio, 1);
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return 0;
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}
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static int ak5386_hw_free(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_codec *codec = dai->codec;
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struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
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if (gpio_is_valid(priv->reset_gpio))
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gpio_set_value(priv->reset_gpio, 0);
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return 0;
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}
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static const struct snd_soc_dai_ops ak5386_dai_ops = {
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.set_fmt = ak5386_set_dai_fmt,
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.hw_params = ak5386_hw_params,
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.hw_free = ak5386_hw_free,
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};
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static struct snd_soc_dai_driver ak5386_dai = {
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.name = "ak5386-hifi",
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.capture = {
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.stream_name = "Capture",
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.channels_min = 1,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_192000,
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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_S24_LE |
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SNDRV_PCM_FMTBIT_S24_3LE,
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},
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.ops = &ak5386_dai_ops,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id ak5386_dt_ids[] = {
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{ .compatible = "asahi-kasei,ak5386", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
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#endif
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static int ak5386_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ak5386_priv *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->reset_gpio = -EINVAL;
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dev_set_drvdata(dev, priv);
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if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
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priv->reset_gpio = of_get_named_gpio(dev->of_node,
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"reset-gpio", 0);
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if (gpio_is_valid(priv->reset_gpio))
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if (devm_gpio_request_one(dev, priv->reset_gpio,
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GPIOF_OUT_INIT_LOW,
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"AK5386 Reset"))
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priv->reset_gpio = -EINVAL;
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return snd_soc_register_codec(dev, &soc_codec_ak5386,
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&ak5386_dai, 1);
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}
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static int ak5386_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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static struct platform_driver ak5386_driver = {
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.probe = ak5386_probe,
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.remove = ak5386_remove,
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.driver = {
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.name = "ak5386",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(ak5386_dt_ids),
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},
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};
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module_platform_driver(ak5386_driver);
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MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
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MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
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MODULE_LICENSE("GPL");
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