[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / soc / codecs / ak5386.c

/*
 * ALSA SoC driver for
 *    Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
 *
 * (c) 2013 Daniel Mack <zonque@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>

struct ak5386_priv {
	int reset_gpio;
};

static struct snd_soc_codec_driver soc_codec_ak5386;

static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
			      unsigned int format)
{
	struct snd_soc_codec *codec = codec_dai->codec;

	format &= SND_SOC_DAIFMT_FORMAT_MASK;
	if (format != SND_SOC_DAIFMT_LEFT_J &&
	    format != SND_SOC_DAIFMT_I2S) {
		dev_err(codec->dev, "Invalid DAI format\n");
		return -EINVAL;
	}

	return 0;
}

static int ak5386_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);

	/*
	 * From the datasheet:
	 *
	 * All external clocks (MCLK, SCLK and LRCK) must be present unless
	 * PDN pin = “L”. If these clocks are not provided, the AK5386 may
	 * draw excess current due to its use of internal dynamically
	 * refreshed logic. If the external clocks are not present, place
	 * the AK5386 in power-down mode (PDN pin = “L”).
	 */

	if (gpio_is_valid(priv->reset_gpio))
		gpio_set_value(priv->reset_gpio, 1);

	return 0;
}

static int ak5386_hw_free(struct snd_pcm_substream *substream,
			  struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);

	if (gpio_is_valid(priv->reset_gpio))
		gpio_set_value(priv->reset_gpio, 0);

	return 0;
}

static const struct snd_soc_dai_ops ak5386_dai_ops = {
	.set_fmt	= ak5386_set_dai_fmt,
	.hw_params	= ak5386_hw_params,
	.hw_free	= ak5386_hw_free,
};

static struct snd_soc_dai_driver ak5386_dai = {
	.name		= "ak5386-hifi",
	.capture	= {
		.stream_name	= "Capture",
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= SNDRV_PCM_RATE_8000_192000,
		.formats	= SNDRV_PCM_FMTBIT_S8     |
				  SNDRV_PCM_FMTBIT_S16_LE |
				  SNDRV_PCM_FMTBIT_S24_LE |
				  SNDRV_PCM_FMTBIT_S24_3LE,
	},
	.ops	= &ak5386_dai_ops,
};

#ifdef CONFIG_OF
static const struct of_device_id ak5386_dt_ids[] = {
	{ .compatible = "asahi-kasei,ak5386", },
	{ }
};
MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
#endif

static int ak5386_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ak5386_priv *priv;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->reset_gpio = -EINVAL;
	dev_set_drvdata(dev, priv);

	if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
		priv->reset_gpio = of_get_named_gpio(dev->of_node,
						      "reset-gpio", 0);

	if (gpio_is_valid(priv->reset_gpio))
		if (devm_gpio_request_one(dev, priv->reset_gpio,
					  GPIOF_OUT_INIT_LOW,
					  "AK5386 Reset"))
			priv->reset_gpio = -EINVAL;

	return snd_soc_register_codec(dev, &soc_codec_ak5386,
				      &ak5386_dai, 1);
}

static int ak5386_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

static struct platform_driver ak5386_driver = {
	.probe		= ak5386_probe,
	.remove		= ak5386_remove,
	.driver		= {
		.name	= "ak5386",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(ak5386_dt_ids),
	},
};

module_platform_driver(ak5386_driver);

MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
cc289be8 DM	1	/*
	2	* ALSA SoC driver for
	3	* Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
	4	*
	5	* (c) 2013 Daniel Mack <zonque@gmail.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/of.h>
	15	#include <linux/of_gpio.h>
	16	#include <linux/of_device.h>
	17	#include <sound/soc.h>
	18	#include <sound/pcm.h>
	19	#include <sound/initval.h>
	20
	21	struct ak5386_priv {
	22	int reset_gpio;
	23	};
	24
	25	static struct snd_soc_codec_driver soc_codec_ak5386;
	26
	27	static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
	28	unsigned int format)
	29	{
	30	struct snd_soc_codec *codec = codec_dai->codec;
	31
	32	format &= SND_SOC_DAIFMT_FORMAT_MASK;
	33	if (format != SND_SOC_DAIFMT_LEFT_J &&
	34	format != SND_SOC_DAIFMT_I2S) {
	35	dev_err(codec->dev, "Invalid DAI format\n");
	36	return -EINVAL;
	37	}
	38
	39	return 0;
	40	}
	41
	42	static int ak5386_hw_params(struct snd_pcm_substream *substream,
	43	struct snd_pcm_hw_params *params,
	44	struct snd_soc_dai *dai)
	45	{
	46	struct snd_soc_codec *codec = dai->codec;
	47	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
	48
	49	/*
	50	* From the datasheet:
	51	*
	52	* All external clocks (MCLK, SCLK and LRCK) must be present unless
	53	* PDN pin = “L”. If these clocks are not provided, the AK5386 may
	54	* draw excess current due to its use of internal dynamically
	55	* refreshed logic. If the external clocks are not present, place
	56	* the AK5386 in power-down mode (PDN pin = “L”).
	57	*/
	58
	59	if (gpio_is_valid(priv->reset_gpio))
	60	gpio_set_value(priv->reset_gpio, 1);
	61
	62	return 0;
	63	}
	64
65	static int ak5386_hw_free(struct snd_pcm_substream *substream,
66	struct snd_soc_dai *dai)
67	{
68	struct snd_soc_codec *codec = dai->codec;
69	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
70
71	if (gpio_is_valid(priv->reset_gpio))
72	gpio_set_value(priv->reset_gpio, 0);
73
74	return 0;
75	}
76
77	static const struct snd_soc_dai_ops ak5386_dai_ops = {
78	.set_fmt = ak5386_set_dai_fmt,
79	.hw_params = ak5386_hw_params,
80	.hw_free = ak5386_hw_free,
81	};
82
83	static struct snd_soc_dai_driver ak5386_dai = {
84	.name = "ak5386-hifi",
85	.capture = {
86	.stream_name = "Capture",
87	.channels_min = 1,
88	.channels_max = 2,
89	.rates = SNDRV_PCM_RATE_8000_192000,
90	.formats = SNDRV_PCM_FMTBIT_S8 \|
91	SNDRV_PCM_FMTBIT_S16_LE \|
92	SNDRV_PCM_FMTBIT_S24_LE \|
93	SNDRV_PCM_FMTBIT_S24_3LE,
94	},
95	.ops = &ak5386_dai_ops,
96	};
97
98	#ifdef CONFIG_OF
99	static const struct of_device_id ak5386_dt_ids[] = {
100	{ .compatible = "asahi-kasei,ak5386", },
101	{ }
102	};
103	MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
104	#endif
105
106	static int ak5386_probe(struct platform_device *pdev)
107	{
108	struct device *dev = &pdev->dev;
109	struct ak5386_priv *priv;
110
111	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
112	if (!priv)
113	return -ENOMEM;
114
115	priv->reset_gpio = -EINVAL;
116	dev_set_drvdata(dev, priv);
117
118	if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
119	priv->reset_gpio = of_get_named_gpio(dev->of_node,
120	"reset-gpio", 0);
121
122	if (gpio_is_valid(priv->reset_gpio))
123	if (devm_gpio_request_one(dev, priv->reset_gpio,
124	GPIOF_OUT_INIT_LOW,
125	"AK5386 Reset"))
126	priv->reset_gpio = -EINVAL;
127
128	return snd_soc_register_codec(dev, &soc_codec_ak5386,
129	&ak5386_dai, 1);
130	}
131
132	static int ak5386_remove(struct platform_device *pdev)
133	{
134	snd_soc_unregister_codec(&pdev->dev);
135	return 0;
136	}
137
138	static struct platform_driver ak5386_driver = {
139	.probe = ak5386_probe,
140	.remove = ak5386_remove,
141	.driver = {
142	.name = "ak5386",
143	.owner = THIS_MODULE,
144	.of_match_table = of_match_ptr(ak5386_dt_ids),
145	},
146	};
147
148	module_platform_driver(ak5386_driver);
149
150	MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
151	MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
152	MODULE_LICENSE("GPL");