[deliverable/linux.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 const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
};

static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
	{ "Capture", NULL, "AINL" },
	{ "Capture", NULL, "AINR" },
};

static struct snd_soc_codec_driver soc_codec_ak5386 = {
	.dapm_widgets = ak5386_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
	.dapm_routes = ak5386_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
};

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
dcf1439a MB	25	static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
	26	SND_SOC_DAPM_INPUT("AINL"),
	27	SND_SOC_DAPM_INPUT("AINR"),
	28	};
	29
	30	static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
	31	{ "Capture", NULL, "AINL" },
	32	{ "Capture", NULL, "AINR" },
	33	};
	34
	35	static struct snd_soc_codec_driver soc_codec_ak5386 = {
	36	.dapm_widgets = ak5386_dapm_widgets,
	37	.num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
	38	.dapm_routes = ak5386_dapm_routes,
	39	.num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
	40	};
cc289be8 DM	41
	42	static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
	43	unsigned int format)
	44	{
	45	struct snd_soc_codec *codec = codec_dai->codec;
	46
	47	format &= SND_SOC_DAIFMT_FORMAT_MASK;
	48	if (format != SND_SOC_DAIFMT_LEFT_J &&
	49	format != SND_SOC_DAIFMT_I2S) {
	50	dev_err(codec->dev, "Invalid DAI format\n");
	51	return -EINVAL;
	52	}
	53
	54	return 0;
	55	}
	56
	57	static int ak5386_hw_params(struct snd_pcm_substream *substream,
	58	struct snd_pcm_hw_params *params,
	59	struct snd_soc_dai *dai)
	60	{
	61	struct snd_soc_codec *codec = dai->codec;
	62	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
	63
	64	/*
	65	* From the datasheet:
	66	*
	67	* All external clocks (MCLK, SCLK and LRCK) must be present unless
	68	* PDN pin = “L”. If these clocks are not provided, the AK5386 may
	69	* draw excess current due to its use of internal dynamically
	70	* refreshed logic. If the external clocks are not present, place
	71	* the AK5386 in power-down mode (PDN pin = “L”).
	72	*/
	73
	74	if (gpio_is_valid(priv->reset_gpio))
	75	gpio_set_value(priv->reset_gpio, 1);
	76
	77	return 0;
	78	}
	79
	80	static int ak5386_hw_free(struct snd_pcm_substream *substream,
	81	struct snd_soc_dai *dai)
	82	{
	83	struct snd_soc_codec *codec = dai->codec;
	84	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
	85
	86	if (gpio_is_valid(priv->reset_gpio))
	87	gpio_set_value(priv->reset_gpio, 0);
	88
	89	return 0;
	90	}
	91
	92	static const struct snd_soc_dai_ops ak5386_dai_ops = {
	93	.set_fmt = ak5386_set_dai_fmt,
	94	.hw_params = ak5386_hw_params,
	95	.hw_free = ak5386_hw_free,
	96	};
	97
	98	static struct snd_soc_dai_driver ak5386_dai = {
	99	.name = "ak5386-hifi",
	100	.capture = {
	101	.stream_name = "Capture",
	102	.channels_min = 1,
	103	.channels_max = 2,
	104	.rates = SNDRV_PCM_RATE_8000_192000,
105	.formats = SNDRV_PCM_FMTBIT_S8 \|
106	SNDRV_PCM_FMTBIT_S16_LE \|
107	SNDRV_PCM_FMTBIT_S24_LE \|
108	SNDRV_PCM_FMTBIT_S24_3LE,
109	},
110	.ops = &ak5386_dai_ops,
111	};
112
113	#ifdef CONFIG_OF
114	static const struct of_device_id ak5386_dt_ids[] = {
115	{ .compatible = "asahi-kasei,ak5386", },
116	{ }
117	};
118	MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
119	#endif
120
121	static int ak5386_probe(struct platform_device *pdev)
122	{
123	struct device *dev = &pdev->dev;
124	struct ak5386_priv *priv;
125
126	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
127	if (!priv)
128	return -ENOMEM;
129
130	priv->reset_gpio = -EINVAL;
131	dev_set_drvdata(dev, priv);
132
133	if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
134	priv->reset_gpio = of_get_named_gpio(dev->of_node,
135	"reset-gpio", 0);
136
137	if (gpio_is_valid(priv->reset_gpio))
138	if (devm_gpio_request_one(dev, priv->reset_gpio,
139	GPIOF_OUT_INIT_LOW,
140	"AK5386 Reset"))
141	priv->reset_gpio = -EINVAL;
142
143	return snd_soc_register_codec(dev, &soc_codec_ak5386,
144	&ak5386_dai, 1);
145	}
146
147	static int ak5386_remove(struct platform_device *pdev)
148	{
149	snd_soc_unregister_codec(&pdev->dev);
150	return 0;
151	}
152
153	static struct platform_driver ak5386_driver = {
154	.probe = ak5386_probe,
155	.remove = ak5386_remove,
156	.driver = {
157	.name = "ak5386",
158	.owner = THIS_MODULE,
159	.of_match_table = of_match_ptr(ak5386_dt_ids),
160	},
161	};
162
163	module_platform_driver(ak5386_driver);
164
165	MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
166	MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
167	MODULE_LICENSE("GPL");