[deliverable/linux.git] / sound / soc / codecs / wm1250-ev1.c

/*
 * Driver for the 1250-EV1 audio I/O module
 *
 * Copyright 2011 Wolfson Microelectronics plc
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>

#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/wm1250-ev1.h>

static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
	"WM1250 CLK_ENA",
	"WM1250 CLK_SEL0",
	"WM1250 CLK_SEL1",
	"WM1250 OSR",
	"WM1250 MASTER",
};

struct wm1250_priv {
	struct gpio gpios[WM1250_EV1_NUM_GPIOS];
};

static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
				     enum snd_soc_bias_level level)
{
	struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
	int ena;

	if (wm1250)
		ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
	else
		ena = -1;

	switch (level) {
	case SND_SOC_BIAS_ON:
		break;

	case SND_SOC_BIAS_PREPARE:
		break;

	case SND_SOC_BIAS_STANDBY:
		if (ena >= 0)
			gpio_set_value_cansleep(ena, 1);
		break;

	case SND_SOC_BIAS_OFF:
		if (ena >= 0)
			gpio_set_value_cansleep(ena, 0);
		break;
	}

	codec->dapm.bias_level = level;

	return 0;
}

static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_INPUT("WM1250 Input"),
SND_SOC_DAPM_OUTPUT("WM1250 Output"),
};

static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
	{ "ADC", NULL, "WM1250 Input" },
	{ "WM1250 Output", NULL, "DAC" },
};

static struct snd_soc_dai_driver wm1250_ev1_dai = {
	.name = "wm1250-ev1",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
	.dapm_widgets = wm1250_ev1_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
	.dapm_routes = wm1250_ev1_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),

	.set_bias_level = wm1250_ev1_set_bias_level,
	.idle_bias_off = true,
};

static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c)
{
	struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
	struct wm1250_priv *wm1250;
	int i, ret;

	if (!pdata)
		return 0;

	wm1250 = kzalloc(sizeof(*wm1250), GFP_KERNEL);
	if (!wm1250) {
		dev_err(&i2c->dev, "Unable to allocate private data\n");
		ret = -ENOMEM;
		goto err;
	}

	for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
		wm1250->gpios[i].gpio = pdata->gpios[i];
		wm1250->gpios[i].label = wm1250_gpio_names[i];
		wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
	}
	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;

	ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
	if (ret != 0) {
		dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
		goto err_alloc;
	}

	dev_set_drvdata(&i2c->dev, wm1250);

	return ret;

err_alloc:
	kfree(wm1250);
err:
	return ret;
}

static void wm1250_ev1_free(struct i2c_client *i2c)
{
	struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);

	if (wm1250) {
		gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
		kfree(wm1250);
	}
}

static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
				      const struct i2c_device_id *i2c_id)
{
	int id, board, rev, ret;

	dev_set_drvdata(&i2c->dev, NULL);

	board = i2c_smbus_read_byte_data(i2c, 0);
	if (board < 0) {
		dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
		return board;
	}

	id = (board & 0xfe) >> 2;
	rev = board & 0x3;

	if (id != 1) {
		dev_err(&i2c->dev, "Unknown board ID %d\n", id);
		return -ENODEV;
	}

	dev_info(&i2c->dev, "revision %d\n", rev + 1);

	ret = wm1250_ev1_pdata(i2c);
	if (ret != 0)
		return ret;

	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
				     &wm1250_ev1_dai, 1);
	if (ret != 0) {
		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
		wm1250_ev1_free(i2c);
		return ret;
	}

	return 0;
}

static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
{
	snd_soc_unregister_codec(&i2c->dev);
	wm1250_ev1_free(i2c);

	return 0;
}

static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
	{ "wm1250-ev1", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);

static struct i2c_driver wm1250_ev1_i2c_driver = {
	.driver = {
		.name = "wm1250-ev1",
		.owner = THIS_MODULE,
	},
	.probe =    wm1250_ev1_probe,
	.remove =   __devexit_p(wm1250_ev1_remove),
	.id_table = wm1250_ev1_i2c_id,
};

static int __init wm1250_ev1_modinit(void)
{
	int ret = 0;

	ret = i2c_add_driver(&wm1250_ev1_i2c_driver);
	if (ret != 0)
		pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret);

	return ret;
}
module_init(wm1250_ev1_modinit);

static void __exit wm1250_ev1_exit(void)
{
	i2c_del_driver(&wm1250_ev1_i2c_driver);
}
module_exit(wm1250_ev1_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4bb3f43c MB	1	/*
	2	* Driver for the 1250-EV1 audio I/O module
	3	*
	4	* Copyright 2011 Wolfson Microelectronics plc
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/module.h>
213eb0fb	15	#include <linux/slab.h>
4bb3f43c	16	#include <linux/i2c.h>
213eb0fb	17	#include <linux/gpio.h>
4bb3f43c MB	18
	19	#include <sound/soc.h>
	20	#include <sound/soc-dapm.h>
213eb0fb MB	21	#include <sound/wm1250-ev1.h>
	22
	23	static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
	24	"WM1250 CLK_ENA",
	25	"WM1250 CLK_SEL0",
	26	"WM1250 CLK_SEL1",
	27	"WM1250 OSR",
	28	"WM1250 MASTER",
	29	};
	30
	31	struct wm1250_priv {
	32	struct gpio gpios[WM1250_EV1_NUM_GPIOS];
	33	};
	34
	35	static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
	36	enum snd_soc_bias_level level)
	37	{
	38	struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
	39	int ena;
	40
	41	if (wm1250)
	42	ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
	43	else
	44	ena = -1;
	45
	46	switch (level) {
	47	case SND_SOC_BIAS_ON:
	48	break;
	49
	50	case SND_SOC_BIAS_PREPARE:
	51	break;
	52
	53	case SND_SOC_BIAS_STANDBY:
	54	if (ena >= 0)
	55	gpio_set_value_cansleep(ena, 1);
	56	break;
	57
	58	case SND_SOC_BIAS_OFF:
	59	if (ena >= 0)
	60	gpio_set_value_cansleep(ena, 0);
	61	break;
	62	}
	63
	64	codec->dapm.bias_level = level;
	65
	66	return 0;
	67	}
4bb3f43c MB	68
	69	static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
	70	SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
	71	SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
	72
	73	SND_SOC_DAPM_INPUT("WM1250 Input"),
979f4869	74	SND_SOC_DAPM_OUTPUT("WM1250 Output"),
4bb3f43c MB	75	};
	76
	77	static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
	78	{ "ADC", NULL, "WM1250 Input" },
	79	{ "WM1250 Output", NULL, "DAC" },
	80	};
	81
	82	static struct snd_soc_dai_driver wm1250_ev1_dai = {
	83	.name = "wm1250-ev1",
	84	.playback = {
	85	.stream_name = "Playback",
	86	.channels_min = 1,
	87	.channels_max = 1,
	88	.rates = SNDRV_PCM_RATE_8000,
	89	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	90	},
	91	.capture = {
	92	.stream_name = "Capture",
	93	.channels_min = 1,
	94	.channels_max = 1,
	95	.rates = SNDRV_PCM_RATE_8000,
	96	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	97	},
	98	};
	99
	100	static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
	101	.dapm_widgets = wm1250_ev1_dapm_widgets,
	102	.num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
	103	.dapm_routes = wm1250_ev1_dapm_routes,
	104	.num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
213eb0fb MB	105
213eb0fb MB	106	.set_bias_level = wm1250_ev1_set_bias_level,
a850260e	107	.idle_bias_off = true,
4bb3f43c MB	108	};
4bb3f43c MB	109
213eb0fb MB	110	static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c)
	111	{
	112	struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
	113	struct wm1250_priv *wm1250;
	114	int i, ret;
	115
	116	if (!pdata)
	117	return 0;
	118
	119	wm1250 = kzalloc(sizeof(*wm1250), GFP_KERNEL);
	120	if (!wm1250) {
	121	dev_err(&i2c->dev, "Unable to allocate private data\n");
	122	ret = -ENOMEM;
	123	goto err;
	124	}
	125
	126	for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
	127	wm1250->gpios[i].gpio = pdata->gpios[i];
	128	wm1250->gpios[i].label = wm1250_gpio_names[i];
	129	wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
	130	}
	131	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
	132	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
	133
	134	ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
	135	if (ret != 0) {
	136	dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
	137	goto err_alloc;
	138	}
	139
	140	dev_set_drvdata(&i2c->dev, wm1250);
	141
	142	return ret;
	143
	144	err_alloc:
	145	kfree(wm1250);
	146	err:
	147	return ret;
	148	}
	149
	150	static void wm1250_ev1_free(struct i2c_client *i2c)
	151	{
	152	struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
	153
	154	if (wm1250) {
	155	gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
	156	kfree(wm1250);
	157	}
	158	}
	159
4bb3f43c	160	static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
eaefb38f	161	const struct i2c_device_id *i2c_id)
4bb3f43c	162	{
213eb0fb MB	163	int id, board, rev, ret;
	164
	165	dev_set_drvdata(&i2c->dev, NULL);
eaefb38f MB	166
	167	board = i2c_smbus_read_byte_data(i2c, 0);
	168	if (board < 0) {
c38071c0 MB	169	dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
c38071c0 MB	170	return board;
eaefb38f MB	171	}
	172
	173	id = (board & 0xfe) >> 2;
	174	rev = board & 0x3;
	175
	176	if (id != 1) {
	177	dev_err(&i2c->dev, "Unknown board ID %d\n", id);
	178	return -ENODEV;
	179	}
	180
5c58b739	181	dev_info(&i2c->dev, "revision %d\n", rev + 1);
eaefb38f	182
213eb0fb MB	183	ret = wm1250_ev1_pdata(i2c);
	184	if (ret != 0)
	185	return ret;
	186
	187	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
	188	&wm1250_ev1_dai, 1);
	189	if (ret != 0) {
	190	dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
	191	wm1250_ev1_free(i2c);
	192	return ret;
	193	}
	194
	195	return 0;
4bb3f43c MB	196	}
	197
	198	static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
	199	{
	200	snd_soc_unregister_codec(&i2c->dev);
213eb0fb	201	wm1250_ev1_free(i2c);
4bb3f43c MB	202
	203	return 0;
	204	}
	205
	206	static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
	207	{ "wm1250-ev1", 0 },
	208	{ }
	209	};
420dd718	210	MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
4bb3f43c MB	211
	212	static struct i2c_driver wm1250_ev1_i2c_driver = {
	213	.driver = {
	214	.name = "wm1250-ev1",
	215	.owner = THIS_MODULE,
	216	},
	217	.probe = wm1250_ev1_probe,
	218	.remove = __devexit_p(wm1250_ev1_remove),
	219	.id_table = wm1250_ev1_i2c_id,
	220	};
	221
	222	static int __init wm1250_ev1_modinit(void)
	223	{
	224	int ret = 0;
	225
	226	ret = i2c_add_driver(&wm1250_ev1_i2c_driver);
	227	if (ret != 0)
	228	pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret);
	229
	230	return ret;
	231	}
	232	module_init(wm1250_ev1_modinit);
	233
	234	static void __exit wm1250_ev1_exit(void)
	235	{
	236	i2c_del_driver(&wm1250_ev1_i2c_driver);
	237	}
	238	module_exit(wm1250_ev1_exit);
	239
	240	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	241	MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
	242	MODULE_LICENSE("GPL");