[linux.git] / drivers / iio / dac / ti-dac5571.c

/*
 * ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver
 *
 * Copyright (C) 2018 Prevas A/S
 *
 * http://www.ti.com/lit/ds/symlink/dac5571.pdf
 * http://www.ti.com/lit/ds/symlink/dac6571.pdf
 * http://www.ti.com/lit/ds/symlink/dac7571.pdf
 * http://www.ti.com/lit/ds/symlink/dac5574.pdf
 * http://www.ti.com/lit/ds/symlink/dac6574.pdf
 * http://www.ti.com/lit/ds/symlink/dac7574.pdf
 * http://www.ti.com/lit/ds/symlink/dac5573.pdf
 * http://www.ti.com/lit/ds/symlink/dac6573.pdf
 * http://www.ti.com/lit/ds/symlink/dac7573.pdf
 *
 * 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/iio/iio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

enum chip_id {
	single_8bit, single_10bit, single_12bit,
	quad_8bit, quad_10bit, quad_12bit
};

struct dac5571_spec {
	u8 num_channels;
	u8 resolution;
};

static const struct dac5571_spec dac5571_spec[] = {
	[single_8bit]  = {.num_channels = 1, .resolution =  8},
	[single_10bit] = {.num_channels = 1, .resolution = 10},
	[single_12bit] = {.num_channels = 1, .resolution = 12},
	[quad_8bit]    = {.num_channels = 4, .resolution =  8},
	[quad_10bit]   = {.num_channels = 4, .resolution = 10},
	[quad_12bit]   = {.num_channels = 4, .resolution = 12},
};

struct dac5571_data {
	struct i2c_client *client;
	int id;
	struct mutex lock;
	struct regulator *vref;
	u16 val[4];
	bool powerdown;
	u8 powerdown_mode;
	struct dac5571_spec const *spec;
	int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
	int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
	u8 buf[3] ____cacheline_aligned;
};

#define DAC5571_POWERDOWN(mode)		((mode) + 1)
#define DAC5571_POWERDOWN_FLAG		BIT(0)
#define DAC5571_CHANNEL_SELECT		1
#define DAC5571_LOADMODE_DIRECT		BIT(4)
#define DAC5571_SINGLE_PWRDWN_BITS	4
#define DAC5571_QUAD_PWRDWN_BITS	6

static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
{
	unsigned int shift;

	shift = 12 - data->spec->resolution;
	data->buf[1] = val << shift;
	data->buf[0] = val >> (8 - shift);

	if (i2c_master_send(data->client, data->buf, 2) != 2)
		return -EIO;

	return 0;
}

static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
{
	unsigned int shift;

	shift = 16 - data->spec->resolution;
	data->buf[2] = val << shift;
	data->buf[1] = (val >> (8 - shift));
	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
		       DAC5571_LOADMODE_DIRECT;

	if (i2c_master_send(data->client, data->buf, 3) != 3)
		return -EIO;

	return 0;
}

static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
{
	data->buf[1] = 0;
	data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;

	if (i2c_master_send(data->client, data->buf, 2) != 2)
		return -EIO;

	return 0;
}

static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
{
	data->buf[2] = 0;
	data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
		       DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;

	if (i2c_master_send(data->client, data->buf, 3) != 3)
		return -EIO;

	return 0;
}

static const char *const dac5571_powerdown_modes[] = {
	"1kohm_to_gnd", "100kohm_to_gnd", "three_state",
};

static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
				      const struct iio_chan_spec *chan)
{
	struct dac5571_data *data = iio_priv(indio_dev);

	return data->powerdown_mode;
}

static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
				      const struct iio_chan_spec *chan,
				      unsigned int mode)
{
	struct dac5571_data *data = iio_priv(indio_dev);
	int ret = 0;

	if (data->powerdown_mode == mode)
		return 0;

	mutex_lock(&data->lock);
	if (data->powerdown) {
		ret = data->dac5571_pwrdwn(data, chan->channel,
					   DAC5571_POWERDOWN(mode));
		if (ret)
			goto out;
	}
	data->powerdown_mode = mode;

 out:
	mutex_unlock(&data->lock);

	return ret;
}

static const struct iio_enum dac5571_powerdown_mode = {
	.items = dac5571_powerdown_modes,
	.num_items = ARRAY_SIZE(dac5571_powerdown_modes),
	.get = dac5571_get_powerdown_mode,
	.set = dac5571_set_powerdown_mode,
};

static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
				      uintptr_t private,
				      const struct iio_chan_spec *chan,
				      char *buf)
{
	struct dac5571_data *data = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", data->powerdown);
}

static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
				       uintptr_t private,
				       const struct iio_chan_spec *chan,
				       const char *buf, size_t len)
{
	struct dac5571_data *data = iio_priv(indio_dev);
	bool powerdown;
	int ret;

	ret = strtobool(buf, &powerdown);
	if (ret)
		return ret;

	if (data->powerdown == powerdown)
		return len;

	mutex_lock(&data->lock);
	if (powerdown)
		ret = data->dac5571_pwrdwn(data, chan->channel,
			    DAC5571_POWERDOWN(data->powerdown_mode));
	else
		ret = data->dac5571_cmd(data, chan->channel, data->val[0]);
	if (ret)
		goto out;

	data->powerdown = powerdown;

 out:
	mutex_unlock(&data->lock);

	return ret ? ret : len;
}


static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
	{
		.name	   = "powerdown",
		.read	   = dac5571_read_powerdown,
		.write	   = dac5571_write_powerdown,
		.shared	   = IIO_SHARED_BY_TYPE,
	},
	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
	IIO_ENUM_AVAILABLE("powerdown_mode", &dac5571_powerdown_mode),
	{},
};

#define dac5571_CHANNEL(chan, name) {				\
	.type = IIO_VOLTAGE,					\
	.channel = (chan),					\
	.address = (chan),					\
	.indexed = true,					\
	.output = true,						\
	.datasheet_name = name,					\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
	.ext_info = dac5571_ext_info,				\
}

static const struct iio_chan_spec dac5571_channels[] = {
	dac5571_CHANNEL(0, "A"),
	dac5571_CHANNEL(1, "B"),
	dac5571_CHANNEL(2, "C"),
	dac5571_CHANNEL(3, "D"),
};

static int dac5571_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct dac5571_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		*val = data->val[chan->channel];
		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:
		ret = regulator_get_voltage(data->vref);
		if (ret < 0)
			return ret;

		*val = ret / 1000;
		*val2 = data->spec->resolution;
		return IIO_VAL_FRACTIONAL_LOG2;

	default:
		return -EINVAL;
	}
}

static int dac5571_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct dac5571_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (data->val[chan->channel] == val)
			return 0;

		if (val >= (1 << data->spec->resolution) || val < 0)
			return -EINVAL;

		if (data->powerdown)
			return -EBUSY;

		mutex_lock(&data->lock);
		ret = data->dac5571_cmd(data, chan->channel, val);
		if (ret == 0)
			data->val[chan->channel] = val;
		mutex_unlock(&data->lock);
		return ret;

	default:
		return -EINVAL;
	}
}

static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
				     struct iio_chan_spec const *chan,
				     long mask)
{
	return IIO_VAL_INT;
}

static const struct iio_info dac5571_info = {
	.read_raw = dac5571_read_raw,
	.write_raw = dac5571_write_raw,
	.write_raw_get_fmt = dac5571_write_raw_get_fmt,
};

static int dac5571_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	const struct dac5571_spec *spec;
	struct dac5571_data *data;
	struct iio_dev *indio_dev;
	int ret, i;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	indio_dev->dev.parent = dev;
	indio_dev->dev.of_node = client->dev.of_node;
	indio_dev->info = &dac5571_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = dac5571_channels;

	spec = &dac5571_spec[id->driver_data];
	indio_dev->num_channels = spec->num_channels;
	data->spec = spec;

	data->vref = devm_regulator_get(dev, "vref");
	if (IS_ERR(data->vref))
		return PTR_ERR(data->vref);

	ret = regulator_enable(data->vref);
	if (ret < 0)
		return ret;

	mutex_init(&data->lock);

	switch (spec->num_channels) {
	case 1:
		data->dac5571_cmd = dac5571_cmd_single;
		data->dac5571_pwrdwn = dac5571_pwrdwn_single;
		break;
	case 4:
		data->dac5571_cmd = dac5571_cmd_quad;
		data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
		break;
	default:
		goto err;
	}

	for (i = 0; i < spec->num_channels; i++) {
		ret = data->dac5571_cmd(data, i, 0);
		if (ret) {
			dev_err(dev, "failed to initialize channel %d to 0\n", i);
			goto err;
		}
	}

	ret = iio_device_register(indio_dev);
	if (ret)
		goto err;

	return 0;

 err:
	regulator_disable(data->vref);
	return ret;
}

static int dac5571_remove(struct i2c_client *i2c)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
	struct dac5571_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	regulator_disable(data->vref);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id dac5571_of_id[] = {
	{.compatible = "ti,dac5571"},
	{.compatible = "ti,dac6571"},
	{.compatible = "ti,dac7571"},
	{.compatible = "ti,dac5574"},
	{.compatible = "ti,dac6574"},
	{.compatible = "ti,dac7574"},
	{.compatible = "ti,dac5573"},
	{.compatible = "ti,dac6573"},
	{.compatible = "ti,dac7573"},
	{}
};
MODULE_DEVICE_TABLE(of, dac5571_of_id);
#endif

static const struct i2c_device_id dac5571_id[] = {
	{"dac5571", single_8bit},
	{"dac6571", single_10bit},
	{"dac7571", single_12bit},
	{"dac5574", quad_8bit},
	{"dac6574", quad_10bit},
	{"dac7574", quad_12bit},
	{"dac5573", quad_8bit},
	{"dac6573", quad_10bit},
	{"dac7573", quad_12bit},
	{}
};
MODULE_DEVICE_TABLE(i2c, dac5571_id);

static struct i2c_driver dac5571_driver = {
	.driver = {
		   .name = "ti-dac5571",
		   .of_match_table = of_match_ptr(dac5571_of_id),
	},
	.probe	  = dac5571_probe,
	.remove   = dac5571_remove,
	.id_table = dac5571_id,
};
module_i2c_driver(dac5571_driver);

MODULE_AUTHOR("Sean Nyekjaer <[email protected]>");
MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
df38a4a7 SN	1	/*
	2	* ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver
	3	*
	4	* Copyright (C) 2018 Prevas A/S
	5	*
	6	* http://www.ti.com/lit/ds/symlink/dac5571.pdf
	7	* http://www.ti.com/lit/ds/symlink/dac6571.pdf
	8	* http://www.ti.com/lit/ds/symlink/dac7571.pdf
	9	* http://www.ti.com/lit/ds/symlink/dac5574.pdf
	10	* http://www.ti.com/lit/ds/symlink/dac6574.pdf
	11	* http://www.ti.com/lit/ds/symlink/dac7574.pdf
	12	* http://www.ti.com/lit/ds/symlink/dac5573.pdf
	13	* http://www.ti.com/lit/ds/symlink/dac6573.pdf
	14	* http://www.ti.com/lit/ds/symlink/dac7573.pdf
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License (version 2) as
	18	* published by the Free Software Foundation.
	19	*/
	20
	21	#include <linux/iio/iio.h>
	22	#include <linux/i2c.h>
	23	#include <linux/module.h>
	24	#include <linux/of_device.h>
	25	#include <linux/of.h>
	26	#include <linux/regulator/consumer.h>
	27
	28	enum chip_id {
	29	single_8bit, single_10bit, single_12bit,
	30	quad_8bit, quad_10bit, quad_12bit
	31	};
	32
	33	struct dac5571_spec {
	34	u8 num_channels;
	35	u8 resolution;
	36	};
	37
	38	static const struct dac5571_spec dac5571_spec[] = {
	39	[single_8bit] = {.num_channels = 1, .resolution = 8},
	40	[single_10bit] = {.num_channels = 1, .resolution = 10},
	41	[single_12bit] = {.num_channels = 1, .resolution = 12},
	42	[quad_8bit] = {.num_channels = 4, .resolution = 8},
	43	[quad_10bit] = {.num_channels = 4, .resolution = 10},
	44	[quad_12bit] = {.num_channels = 4, .resolution = 12},
	45	};
	46
	47	struct dac5571_data {
	48	struct i2c_client *client;
	49	int id;
	50	struct mutex lock;
	51	struct regulator *vref;
	52	u16 val[4];
	53	bool powerdown;
	54	u8 powerdown_mode;
	55	struct dac5571_spec const *spec;
	56	int (dac5571_cmd)(struct dac5571_data data, int channel, u16 val);
	57	int (dac5571_pwrdwn)(struct dac5571_data data, int channel, u8 pwrdwn);
	58	u8 buf[3] ____cacheline_aligned;
	59	};
	60
	61	#define DAC5571_POWERDOWN(mode) ((mode) + 1)
	62	#define DAC5571_POWERDOWN_FLAG BIT(0)
	63	#define DAC5571_CHANNEL_SELECT 1
	64	#define DAC5571_LOADMODE_DIRECT BIT(4)
65	#define DAC5571_SINGLE_PWRDWN_BITS 4
66	#define DAC5571_QUAD_PWRDWN_BITS 6
67
68	static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
69	{
70	unsigned int shift;
71
72	shift = 12 - data->spec->resolution;
73	data->buf[1] = val << shift;
74	data->buf[0] = val >> (8 - shift);
75
76	if (i2c_master_send(data->client, data->buf, 2) != 2)
77	return -EIO;
78
79	return 0;
80	}
81
82	static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
83	{
84	unsigned int shift;
85
86	shift = 16 - data->spec->resolution;
87	data->buf[2] = val << shift;
88	data->buf[1] = (val >> (8 - shift));
89	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) \|
90	DAC5571_LOADMODE_DIRECT;
91
92	if (i2c_master_send(data->client, data->buf, 3) != 3)
93	return -EIO;
94
95	return 0;
96	}
97
98	static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
99	{
df38a4a7 SN	100	data->buf[1] = 0;
	101	data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;
	102
	103	if (i2c_master_send(data->client, data->buf, 2) != 2)
	104	return -EIO;
	105
	106	return 0;
	107	}
	108
	109	static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
	110	{
df38a4a7 SN	111	data->buf[2] = 0;
	112	data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
	113	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) \|
	114	DAC5571_LOADMODE_DIRECT \| DAC5571_POWERDOWN_FLAG;
	115
	116	if (i2c_master_send(data->client, data->buf, 3) != 3)
	117	return -EIO;
	118
	119	return 0;
	120	}
	121
	122	static const char *const dac5571_powerdown_modes[] = {
	123	"1kohm_to_gnd", "100kohm_to_gnd", "three_state",
	124	};
	125
	126	static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
	127	const struct iio_chan_spec *chan)
	128	{
	129	struct dac5571_data *data = iio_priv(indio_dev);
	130
	131	return data->powerdown_mode;
	132	}
	133
	134	static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
	135	const struct iio_chan_spec *chan,
	136	unsigned int mode)
	137	{
	138	struct dac5571_data *data = iio_priv(indio_dev);
	139	int ret = 0;
	140
	141	if (data->powerdown_mode == mode)
	142	return 0;
	143
	144	mutex_lock(&data->lock);
	145	if (data->powerdown) {
	146	ret = data->dac5571_pwrdwn(data, chan->channel,
	147	DAC5571_POWERDOWN(mode));
	148	if (ret)
	149	goto out;
	150	}
	151	data->powerdown_mode = mode;
	152
	153	out:
	154	mutex_unlock(&data->lock);
	155
	156	return ret;
	157	}
	158
	159	static const struct iio_enum dac5571_powerdown_mode = {
	160	.items = dac5571_powerdown_modes,
	161	.num_items = ARRAY_SIZE(dac5571_powerdown_modes),
	162	.get = dac5571_get_powerdown_mode,
	163	.set = dac5571_set_powerdown_mode,
	164	};
	165
	166	static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
	167	uintptr_t private,
	168	const struct iio_chan_spec *chan,
	169	char *buf)
	170	{
	171	struct dac5571_data *data = iio_priv(indio_dev);
	172
	173	return sprintf(buf, "%d\n", data->powerdown);
	174	}
175
176	static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
177	uintptr_t private,
178	const struct iio_chan_spec *chan,
179	const char *buf, size_t len)
180	{
181	struct dac5571_data *data = iio_priv(indio_dev);
182	bool powerdown;
183	int ret;
184
185	ret = strtobool(buf, &powerdown);
186	if (ret)
187	return ret;
188
189	if (data->powerdown == powerdown)
190	return len;
191
192	mutex_lock(&data->lock);
193	if (powerdown)
194	ret = data->dac5571_pwrdwn(data, chan->channel,
195	DAC5571_POWERDOWN(data->powerdown_mode));
196	else
197	ret = data->dac5571_cmd(data, chan->channel, data->val[0]);
198	if (ret)
199	goto out;
200
201	data->powerdown = powerdown;
202
203	out:
204	mutex_unlock(&data->lock);
205
206	return ret ? ret : len;
207	}
208
209
210	static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
211	{
212	.name = "powerdown",
213	.read = dac5571_read_powerdown,
214	.write = dac5571_write_powerdown,
215	.shared = IIO_SHARED_BY_TYPE,
216	},
217	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
218	IIO_ENUM_AVAILABLE("powerdown_mode", &dac5571_powerdown_mode),
219	{},
220	};
221
222	#define dac5571_CHANNEL(chan, name) { \
223	.type = IIO_VOLTAGE, \
224	.channel = (chan), \
225	.address = (chan), \
226	.indexed = true, \
227	.output = true, \
228	.datasheet_name = name, \
229	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
230	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
231	.ext_info = dac5571_ext_info, \
232	}
233
234	static const struct iio_chan_spec dac5571_channels[] = {
235	dac5571_CHANNEL(0, "A"),
236	dac5571_CHANNEL(1, "B"),
237	dac5571_CHANNEL(2, "C"),
238	dac5571_CHANNEL(3, "D"),
239	};
240
241	static int dac5571_read_raw(struct iio_dev *indio_dev,
242	struct iio_chan_spec const *chan,
243	int val, int val2, long mask)
244	{
245	struct dac5571_data *data = iio_priv(indio_dev);
246	int ret;
247
248	switch (mask) {
249	case IIO_CHAN_INFO_RAW:
250	*val = data->val[chan->channel];
251	return IIO_VAL_INT;
252
253	case IIO_CHAN_INFO_SCALE:
254	ret = regulator_get_voltage(data->vref);
255	if (ret < 0)
256	return ret;
257
258	*val = ret / 1000;
259	*val2 = data->spec->resolution;
260	return IIO_VAL_FRACTIONAL_LOG2;
261
262	default:
263	return -EINVAL;
264	}
265	}
266
267	static int dac5571_write_raw(struct iio_dev *indio_dev,
268	struct iio_chan_spec const *chan,
269	int val, int val2, long mask)
270	{
271	struct dac5571_data *data = iio_priv(indio_dev);
272	int ret;
273
274	switch (mask) {
275	case IIO_CHAN_INFO_RAW:
276	if (data->val[chan->channel] == val)
277	return 0;
278
279	if (val >= (1 << data->spec->resolution) \|\| val < 0)
280	return -EINVAL;
281
282	if (data->powerdown)
283	return -EBUSY;
284
285	mutex_lock(&data->lock);
286	ret = data->dac5571_cmd(data, chan->channel, val);
287	if (ret == 0)
288	data->val[chan->channel] = val;
289	mutex_unlock(&data->lock);
290	return ret;
291
292	default:
293	return -EINVAL;
294	}
295	}
296
297	static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
298	struct iio_chan_spec const *chan,
299	long mask)
300	{
301	return IIO_VAL_INT;
302	}
303
304	static const struct iio_info dac5571_info = {
305	.read_raw = dac5571_read_raw,
306	.write_raw = dac5571_write_raw,
307	.write_raw_get_fmt = dac5571_write_raw_get_fmt,
308	};
309
310	static int dac5571_probe(struct i2c_client *client,
311	const struct i2c_device_id *id)
312	{
313	struct device *dev = &client->dev;
314	const struct dac5571_spec *spec;
315	struct dac5571_data *data;
316	struct iio_dev *indio_dev;
317	int ret, i;
318
319	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
320	if (!indio_dev)
321	return -ENOMEM;
322
323	data = iio_priv(indio_dev);
324	i2c_set_clientdata(client, indio_dev);
325	data->client = client;
326
327	indio_dev->dev.parent = dev;
328	indio_dev->dev.of_node = client->dev.of_node;
329	indio_dev->info = &dac5571_info;
330	indio_dev->name = id->name;
331	indio_dev->modes = INDIO_DIRECT_MODE;
332	indio_dev->channels = dac5571_channels;
333
334	spec = &dac5571_spec[id->driver_data];
335	indio_dev->num_channels = spec->num_channels;
336	data->spec = spec;
337
338	data->vref = devm_regulator_get(dev, "vref");
339	if (IS_ERR(data->vref))
340	return PTR_ERR(data->vref);
341
342	ret = regulator_enable(data->vref);
343	if (ret < 0)
344	return ret;
345
346	mutex_init(&data->lock);
347
348	switch (spec->num_channels) {
349	case 1:
350	data->dac5571_cmd = dac5571_cmd_single;
351	data->dac5571_pwrdwn = dac5571_pwrdwn_single;
352	break;
353	case 4:
354	data->dac5571_cmd = dac5571_cmd_quad;
355	data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
356	break;
357	default:
358	goto err;
359	}
360
361	for (i = 0; i < spec->num_channels; i++) {
362	ret = data->dac5571_cmd(data, i, 0);
363	if (ret) {
364	dev_err(dev, "failed to initialize channel %d to 0\n", i);
365	goto err;
366	}
367	}
368
369	ret = iio_device_register(indio_dev);
370	if (ret)
371	goto err;
372
373	return 0;
374
375	err:
376	regulator_disable(data->vref);
377	return ret;
378	}
379
380	static int dac5571_remove(struct i2c_client *i2c)
381	{
382	struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
383	struct dac5571_data *data = iio_priv(indio_dev);
384
385	iio_device_unregister(indio_dev);
386	regulator_disable(data->vref);
387
388	return 0;
389	}
390
391	#ifdef CONFIG_OF
392	static const struct of_device_id dac5571_of_id[] = {
393	{.compatible = "ti,dac5571"},
394	{.compatible = "ti,dac6571"},
395	{.compatible = "ti,dac7571"},
396	{.compatible = "ti,dac5574"},
397	{.compatible = "ti,dac6574"},
398	{.compatible = "ti,dac7574"},
399	{.compatible = "ti,dac5573"},
400	{.compatible = "ti,dac6573"},
401	{.compatible = "ti,dac7573"},
402	{}
403	};
404	MODULE_DEVICE_TABLE(of, dac5571_of_id);
405	#endif
406
407	static const struct i2c_device_id dac5571_id[] = {
408	{"dac5571", single_8bit},
409	{"dac6571", single_10bit},
410	{"dac7571", single_12bit},
411	{"dac5574", quad_8bit},
412	{"dac6574", quad_10bit},
413	{"dac7574", quad_12bit},
414	{"dac5573", quad_8bit},
415	{"dac6573", quad_10bit},
416	{"dac7573", quad_12bit},
417	{}
418	};
419	MODULE_DEVICE_TABLE(i2c, dac5571_id);
420
421	static struct i2c_driver dac5571_driver = {
422	.driver = {
423	.name = "ti-dac5571",
91d05d76	424	.of_match_table = of_match_ptr(dac5571_of_id),
df38a4a7 SN	425	},
	426	.probe = dac5571_probe,
	427	.remove = dac5571_remove,
	428	.id_table = dac5571_id,
	429	};
	430	module_i2c_driver(dac5571_driver);
	431
	432	MODULE_AUTHOR("Sean Nyekjaer <[email protected]>");
	433	MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
	434	MODULE_LICENSE("GPL v2");