[deliverable/linux.git] / drivers / iio / dac / mcp4725.c

/*
 * mcp4725.c - Support for Microchip MCP4725/6
 *
 * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * Based on max517 by Roland Stigge <stigge@antcom.de>
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
 * (7-bit I2C slave address 0x60, the three LSBs can be configured in
 * hardware)
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#include <linux/iio/dac/mcp4725.h>

#define MCP4725_DRV_NAME "mcp4725"

struct mcp4725_data {
	struct i2c_client *client;
	u16 vref_mv;
	u16 dac_value;
	bool powerdown;
	unsigned powerdown_mode;
};

static int mcp4725_suspend(struct device *dev)
{
	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
	u8 outbuf[2];

	outbuf[0] = (data->powerdown_mode + 1) << 4;
	outbuf[1] = 0;
	data->powerdown = true;

	return i2c_master_send(data->client, outbuf, 2);
}

static int mcp4725_resume(struct device *dev)
{
	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));
	u8 outbuf[2];

	/* restore previous DAC value */
	outbuf[0] = (data->dac_value >> 8) & 0xf;
	outbuf[1] = data->dac_value & 0xff;
	data->powerdown = false;

	return i2c_master_send(data->client, outbuf, 2);
}

#ifdef CONFIG_PM_SLEEP
static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
#define MCP4725_PM_OPS (&mcp4725_pm_ops)
#else
#define MCP4725_PM_OPS NULL
#endif

static ssize_t mcp4725_store_eeprom(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct mcp4725_data *data = iio_priv(indio_dev);
	int tries = 20;
	u8 inoutbuf[3];
	bool state;
	int ret;

	ret = strtobool(buf, &state);
	if (ret < 0)
		return ret;

	if (!state)
		return 0;

	inoutbuf[0] = 0x60; /* write EEPROM */
	inoutbuf[1] = data->dac_value >> 4;
	inoutbuf[2] = (data->dac_value & 0xf) << 4;

	ret = i2c_master_send(data->client, inoutbuf, 3);
	if (ret < 0)
		return ret;
	else if (ret != 3)
		return -EIO;

	/* wait for write complete, takes up to 50ms */
	while (tries--) {
		msleep(20);
		ret = i2c_master_recv(data->client, inoutbuf, 3);
		if (ret < 0)
			return ret;
		else if (ret != 3)
			return -EIO;

		if (inoutbuf[0] & 0x80)
			break;
	}

	if (tries < 0) {
		dev_err(&data->client->dev,
			"mcp4725_store_eeprom() failed, incomplete\n");
		return -EIO;
	}

	return len;
}

static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);

static struct attribute *mcp4725_attributes[] = {
	&iio_dev_attr_store_eeprom.dev_attr.attr,
	NULL,
};

static const struct attribute_group mcp4725_attribute_group = {
	.attrs = mcp4725_attributes,
};

static const char * const mcp4725_powerdown_modes[] = {
	"1kohm_to_gnd",
	"100kohm_to_gnd",
	"500kohm_to_gnd"
};

static const char * const mcp4726_powerdown_modes[] = {
	"1kohm_to_gnd",
	"125kohm_to_gnd",
	"640kohm_to_gnd"
};

static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct mcp4725_data *data = iio_priv(indio_dev);

	return data->powerdown_mode;
}

static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned mode)
{
	struct mcp4725_data *data = iio_priv(indio_dev);

	data->powerdown_mode = mode;

	return 0;
}

static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct mcp4725_data *data = iio_priv(indio_dev);

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

static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	 uintptr_t private, const struct iio_chan_spec *chan,
	 const char *buf, size_t len)
{
	struct mcp4725_data *data = iio_priv(indio_dev);
	bool state;
	int ret;

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

	if (state)
		ret = mcp4725_suspend(&data->client->dev);
	else
		ret = mcp4725_resume(&data->client->dev);
	if (ret < 0)
		return ret;

	return len;
}

enum {
	MCP4725,
	MCP4726,
};

static const struct iio_enum mcp472x_powerdown_mode_enum[] = {
	[MCP4725] = {
		.items = mcp4725_powerdown_modes,
		.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
		.get = mcp4725_get_powerdown_mode,
		.set = mcp4725_set_powerdown_mode,
	},
	[MCP4726] = {
		.items = mcp4726_powerdown_modes,
		.num_items = ARRAY_SIZE(mcp4726_powerdown_modes),
		.get = mcp4725_get_powerdown_mode,
		.set = mcp4725_set_powerdown_mode,
	},
};

static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	{
		.name = "powerdown",
		.read = mcp4725_read_powerdown,
		.write = mcp4725_write_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
			&mcp472x_powerdown_mode_enum[MCP4725]),
	IIO_ENUM_AVAILABLE("powerdown_mode",
			&mcp472x_powerdown_mode_enum[MCP4725]),
	{ },
};

static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = {
	{
		.name = "powerdown",
		.read = mcp4725_read_powerdown,
		.write = mcp4725_write_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
			&mcp472x_powerdown_mode_enum[MCP4726]),
	IIO_ENUM_AVAILABLE("powerdown_mode",
			&mcp472x_powerdown_mode_enum[MCP4726]),
	{ },
};

static const struct iio_chan_spec mcp472x_channel[] = {
	[MCP4725] = {
		.type		= IIO_VOLTAGE,
		.indexed	= 1,
		.output		= 1,
		.channel	= 0,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
		.ext_info	= mcp4725_ext_info,
	},
	[MCP4726] = {
		.type		= IIO_VOLTAGE,
		.indexed	= 1,
		.output		= 1,
		.channel	= 0,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
		.ext_info	= mcp4726_ext_info,
	},
};

static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
{
	struct mcp4725_data *data = iio_priv(indio_dev);
	u8 outbuf[2];
	int ret;

	if (val >= (1 << 12) || val < 0)
		return -EINVAL;

	outbuf[0] = (val >> 8) & 0xf;
	outbuf[1] = val & 0xff;

	ret = i2c_master_send(data->client, outbuf, 2);
	if (ret < 0)
		return ret;
	else if (ret != 2)
		return -EIO;
	else
		return 0;
}

static int mcp4725_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2, long mask)
{
	struct mcp4725_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		*val = data->dac_value;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = data->vref_mv;
		*val2 = 12;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
}

static int mcp4725_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val, int val2, long mask)
{
	struct mcp4725_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = mcp4725_set_value(indio_dev, val);
		data->dac_value = val;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static const struct iio_info mcp4725_info = {
	.read_raw = mcp4725_read_raw,
	.write_raw = mcp4725_write_raw,
	.attrs = &mcp4725_attribute_group,
	.driver_module = THIS_MODULE,
};

static int mcp4725_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct mcp4725_data *data;
	struct iio_dev *indio_dev;
	struct mcp4725_platform_data *platform_data = client->dev.platform_data;
	u8 inbuf[3];
	u8 pd;
	int err;

	if (!platform_data || !platform_data->vref_mv) {
		dev_err(&client->dev, "invalid platform data");
		return -EINVAL;
	}

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (indio_dev == NULL)
		return -ENOMEM;
	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	indio_dev->dev.parent = &client->dev;
	indio_dev->name = id->name;
	indio_dev->info = &mcp4725_info;
	indio_dev->channels = &mcp472x_channel[id->driver_data];
	indio_dev->num_channels = 1;
	indio_dev->modes = INDIO_DIRECT_MODE;

	data->vref_mv = platform_data->vref_mv;

	/* read current DAC value */
	err = i2c_master_recv(client, inbuf, 3);
	if (err < 0) {
		dev_err(&client->dev, "failed to read DAC value");
		return err;
	}
	pd = (inbuf[0] >> 1) & 0x3;
	data->powerdown = pd > 0 ? true : false;
	data->powerdown_mode = pd ? pd - 1 : 2; /* largest register to gnd */
	data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);

	return iio_device_register(indio_dev);
}

static int mcp4725_remove(struct i2c_client *client)
{
	iio_device_unregister(i2c_get_clientdata(client));
	return 0;
}

static const struct i2c_device_id mcp4725_id[] = {
	{ "mcp4725", MCP4725 },
	{ "mcp4726", MCP4726 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mcp4725_id);

static struct i2c_driver mcp4725_driver = {
	.driver = {
		.name	= MCP4725_DRV_NAME,
		.pm	= MCP4725_PM_OPS,
	},
	.probe		= mcp4725_probe,
	.remove		= mcp4725_remove,
	.id_table	= mcp4725_id,
};
module_i2c_driver(mcp4725_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");
MODULE_LICENSE("GPL");
Commit	Line	Data
cf35ad61	1	/*
35f73967	2	* mcp4725.c - Support for Microchip MCP4725/6
cf35ad61 PM	3	*
	4	* Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
	5	*
	6	* Based on max517 by Roland Stigge <stigge@antcom.de>
	7	*
	8	* This file is subject to the terms and conditions of version 2 of
	9	* the GNU General Public License. See the file COPYING in the main
	10	* directory of this archive for more details.
	11	*
	12	* driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
	13	* (7-bit I2C slave address 0x60, the three LSBs can be configured in
	14	* hardware)
cf35ad61 PM	15	*/
	16
	17	#include <linux/module.h>
cf35ad61 PM	18	#include <linux/i2c.h>
cf35ad61 PM	19	#include <linux/err.h>
f17b77d6	20	#include <linux/delay.h>
cf35ad61 PM	21
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24
	25	#include <linux/iio/dac/mcp4725.h>
	26
	27	#define MCP4725_DRV_NAME "mcp4725"
	28
	29	struct mcp4725_data {
	30	struct i2c_client *client;
	31	u16 vref_mv;
	32	u16 dac_value;
155f1b41 PM	33	bool powerdown;
155f1b41 PM	34	unsigned powerdown_mode;
cf35ad61 PM	35	};
cf35ad61 PM	36
cf35ad61 PM	37	static int mcp4725_suspend(struct device *dev)
cf35ad61 PM	38	{
a97dd069 PM	39	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	40	to_i2c_client(dev)));
cf35ad61 PM	41	u8 outbuf[2];
cf35ad61 PM	42
155f1b41	43	outbuf[0] = (data->powerdown_mode + 1) << 4;
cf35ad61	44	outbuf[1] = 0;
155f1b41	45	data->powerdown = true;
cf35ad61	46
a97dd069	47	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	48	}
	49
	50	static int mcp4725_resume(struct device *dev)
	51	{
a97dd069 PM	52	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	53	to_i2c_client(dev)));
cf35ad61 PM	54	u8 outbuf[2];
	55
	56	/* restore previous DAC value */
	57	outbuf[0] = (data->dac_value >> 8) & 0xf;
	58	outbuf[1] = data->dac_value & 0xff;
155f1b41	59	data->powerdown = false;
cf35ad61	60
a97dd069	61	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	62	}
cf35ad61 PM	63
155f1b41	64	#ifdef CONFIG_PM_SLEEP
cf35ad61 PM	65	static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
	66	#define MCP4725_PM_OPS (&mcp4725_pm_ops)
	67	#else
	68	#define MCP4725_PM_OPS NULL
	69	#endif
	70
4fd313da	71	static ssize_t mcp4725_store_eeprom(struct device *dev,
f17b77d6 PM	72	struct device_attribute attr, const char buf, size_t len)
	73	{
	74	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	75	struct mcp4725_data *data = iio_priv(indio_dev);
	76	int tries = 20;
	77	u8 inoutbuf[3];
	78	bool state;
	79	int ret;
	80
	81	ret = strtobool(buf, &state);
	82	if (ret < 0)
	83	return ret;
	84
	85	if (!state)
	86	return 0;
	87
	88	inoutbuf[0] = 0x60; /* write EEPROM */
	89	inoutbuf[1] = data->dac_value >> 4;
	90	inoutbuf[2] = (data->dac_value & 0xf) << 4;
	91
	92	ret = i2c_master_send(data->client, inoutbuf, 3);
	93	if (ret < 0)
	94	return ret;
	95	else if (ret != 3)
	96	return -EIO;
	97
	98	/* wait for write complete, takes up to 50ms */
	99	while (tries--) {
	100	msleep(20);
	101	ret = i2c_master_recv(data->client, inoutbuf, 3);
	102	if (ret < 0)
	103	return ret;
	104	else if (ret != 3)
	105	return -EIO;
	106
	107	if (inoutbuf[0] & 0x80)
	108	break;
	109	}
	110
	111	if (tries < 0) {
	112	dev_err(&data->client->dev,
	113	"mcp4725_store_eeprom() failed, incomplete\n");
	114	return -EIO;
	115	}
	116
	117	return len;
	118	}
	119
	120	static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);
	121
	122	static struct attribute *mcp4725_attributes[] = {
	123	&iio_dev_attr_store_eeprom.dev_attr.attr,
	124	NULL,
	125	};
	126
	127	static const struct attribute_group mcp4725_attribute_group = {
	128	.attrs = mcp4725_attributes,
	129	};
	130
155f1b41 PM	131	static const char * const mcp4725_powerdown_modes[] = {
	132	"1kohm_to_gnd",
	133	"100kohm_to_gnd",
	134	"500kohm_to_gnd"
	135	};
	136
35f73967 AM	137	static const char * const mcp4726_powerdown_modes[] = {
	138	"1kohm_to_gnd",
	139	"125kohm_to_gnd",
	140	"640kohm_to_gnd"
	141	};
	142
155f1b41 PM	143	static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	144	const struct iio_chan_spec *chan)
	145	{
	146	struct mcp4725_data *data = iio_priv(indio_dev);
	147
	148	return data->powerdown_mode;
	149	}
	150
	151	static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	152	const struct iio_chan_spec *chan, unsigned mode)
	153	{
	154	struct mcp4725_data *data = iio_priv(indio_dev);
	155
	156	data->powerdown_mode = mode;
	157
	158	return 0;
	159	}
	160
	161	static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	162	uintptr_t private, const struct iio_chan_spec chan, char buf)
	163	{
	164	struct mcp4725_data *data = iio_priv(indio_dev);
	165
	166	return sprintf(buf, "%d\n", data->powerdown);
	167	}
	168
	169	static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	170	uintptr_t private, const struct iio_chan_spec *chan,
	171	const char *buf, size_t len)
	172	{
	173	struct mcp4725_data *data = iio_priv(indio_dev);
	174	bool state;
	175	int ret;
	176
	177	ret = strtobool(buf, &state);
	178	if (ret)
	179	return ret;
	180
	181	if (state)
	182	ret = mcp4725_suspend(&data->client->dev);
	183	else
	184	ret = mcp4725_resume(&data->client->dev);
	185	if (ret < 0)
	186	return ret;
	187
	188	return len;
	189	}
	190
35f73967 AM	191	enum {
	192	MCP4725,
	193	MCP4726,
	194	};
	195
	196	static const struct iio_enum mcp472x_powerdown_mode_enum[] = {
	197	[MCP4725] = {
	198	.items = mcp4725_powerdown_modes,
	199	.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
	200	.get = mcp4725_get_powerdown_mode,
	201	.set = mcp4725_set_powerdown_mode,
	202	},
	203	[MCP4726] = {
	204	.items = mcp4726_powerdown_modes,
	205	.num_items = ARRAY_SIZE(mcp4726_powerdown_modes),
	206	.get = mcp4725_get_powerdown_mode,
	207	.set = mcp4725_set_powerdown_mode,
	208	},
155f1b41 PM	209	};
	210
	211	static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	212	{
	213	.name = "powerdown",
	214	.read = mcp4725_read_powerdown,
	215	.write = mcp4725_write_powerdown,
3704432f	216	.shared = IIO_SEPARATE,
155f1b41	217	},
35f73967 AM	218	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	219	&mcp472x_powerdown_mode_enum[MCP4725]),
	220	IIO_ENUM_AVAILABLE("powerdown_mode",
	221	&mcp472x_powerdown_mode_enum[MCP4725]),
	222	{ },
	223	};
	224
	225	static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = {
	226	{
	227	.name = "powerdown",
	228	.read = mcp4725_read_powerdown,
	229	.write = mcp4725_write_powerdown,
	230	.shared = IIO_SEPARATE,
	231	},
	232	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	233	&mcp472x_powerdown_mode_enum[MCP4726]),
	234	IIO_ENUM_AVAILABLE("powerdown_mode",
	235	&mcp472x_powerdown_mode_enum[MCP4726]),
155f1b41 PM	236	{ },
	237	};
	238
35f73967 AM	239	static const struct iio_chan_spec mcp472x_channel[] = {
	240	[MCP4725] = {
	241	.type = IIO_VOLTAGE,
	242	.indexed = 1,
	243	.output = 1,
	244	.channel = 0,
	245	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	246	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	247	.ext_info = mcp4725_ext_info,
	248	},
	249	[MCP4726] = {
	250	.type = IIO_VOLTAGE,
	251	.indexed = 1,
	252	.output = 1,
	253	.channel = 0,
	254	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	255	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	256	.ext_info = mcp4726_ext_info,
	257	},
cf35ad61 PM	258	};
	259
	260	static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
	261	{
	262	struct mcp4725_data *data = iio_priv(indio_dev);
	263	u8 outbuf[2];
	264	int ret;
	265
	266	if (val >= (1 << 12) \|\| val < 0)
	267	return -EINVAL;
	268
	269	outbuf[0] = (val >> 8) & 0xf;
	270	outbuf[1] = val & 0xff;
	271
	272	ret = i2c_master_send(data->client, outbuf, 2);
	273	if (ret < 0)
	274	return ret;
	275	else if (ret != 2)
	276	return -EIO;
	277	else
	278	return 0;
	279	}
	280
	281	static int mcp4725_read_raw(struct iio_dev *indio_dev,
	282	struct iio_chan_spec const *chan,
	283	int val, int val2, long mask)
	284	{
	285	struct mcp4725_data *data = iio_priv(indio_dev);
cf35ad61 PM	286
	287	switch (mask) {
	288	case IIO_CHAN_INFO_RAW:
	289	*val = data->dac_value;
	290	return IIO_VAL_INT;
	291	case IIO_CHAN_INFO_SCALE:
b117f96f LPC	292	*val = data->vref_mv;
	293	*val2 = 12;
	294	return IIO_VAL_FRACTIONAL_LOG2;
cf35ad61 PM	295	}
	296	return -EINVAL;
	297	}
	298
	299	static int mcp4725_write_raw(struct iio_dev *indio_dev,
	300	struct iio_chan_spec const *chan,
	301	int val, int val2, long mask)
	302	{
	303	struct mcp4725_data *data = iio_priv(indio_dev);
	304	int ret;
	305
	306	switch (mask) {
	307	case IIO_CHAN_INFO_RAW:
	308	ret = mcp4725_set_value(indio_dev, val);
	309	data->dac_value = val;
	310	break;
	311	default:
	312	ret = -EINVAL;
	313	break;
	314	}
	315
	316	return ret;
	317	}
	318
	319	static const struct iio_info mcp4725_info = {
	320	.read_raw = mcp4725_read_raw,
	321	.write_raw = mcp4725_write_raw,
f17b77d6	322	.attrs = &mcp4725_attribute_group,
cf35ad61 PM	323	.driver_module = THIS_MODULE,
	324	};
	325
fc52692c GKH	326	static int mcp4725_probe(struct i2c_client *client,
fc52692c GKH	327	const struct i2c_device_id *id)
cf35ad61 PM	328	{
	329	struct mcp4725_data *data;
	330	struct iio_dev *indio_dev;
	331	struct mcp4725_platform_data *platform_data = client->dev.platform_data;
	332	u8 inbuf[3];
155f1b41	333	u8 pd;
cf35ad61 PM	334	int err;
	335
	336	if (!platform_data \|\| !platform_data->vref_mv) {
	337	dev_err(&client->dev, "invalid platform data");
b6ff86f3	338	return -EINVAL;
cf35ad61 PM	339	}
cf35ad61 PM	340
b6ff86f3 PM	341	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	342	if (indio_dev == NULL)
	343	return -ENOMEM;
cf35ad61 PM	344	data = iio_priv(indio_dev);
	345	i2c_set_clientdata(client, indio_dev);
	346	data->client = client;
	347
	348	indio_dev->dev.parent = &client->dev;
97a249e9	349	indio_dev->name = id->name;
cf35ad61	350	indio_dev->info = &mcp4725_info;
35f73967	351	indio_dev->channels = &mcp472x_channel[id->driver_data];
cf35ad61 PM	352	indio_dev->num_channels = 1;
	353	indio_dev->modes = INDIO_DIRECT_MODE;
	354
	355	data->vref_mv = platform_data->vref_mv;
	356
	357	/* read current DAC value */
	358	err = i2c_master_recv(client, inbuf, 3);
	359	if (err < 0) {
	360	dev_err(&client->dev, "failed to read DAC value");
b6ff86f3	361	return err;
cf35ad61	362	}
155f1b41 PM	363	pd = (inbuf[0] >> 1) & 0x3;
155f1b41 PM	364	data->powerdown = pd > 0 ? true : false;
35f73967	365	data->powerdown_mode = pd ? pd - 1 : 2; /* largest register to gnd */
cf35ad61 PM	366	data->dac_value = (inbuf[1] << 4) \| (inbuf[2] >> 4);
cf35ad61 PM	367
a9b68511	368	return iio_device_register(indio_dev);
cf35ad61 PM	369	}
cf35ad61 PM	370
fc52692c	371	static int mcp4725_remove(struct i2c_client *client)
cf35ad61	372	{
b6ff86f3	373	iio_device_unregister(i2c_get_clientdata(client));
cf35ad61 PM	374	return 0;
	375	}
	376
	377	static const struct i2c_device_id mcp4725_id[] = {
35f73967 AM	378	{ "mcp4725", MCP4725 },
35f73967 AM	379	{ "mcp4726", MCP4726 },
cf35ad61 PM	380	{ }
	381	};
	382	MODULE_DEVICE_TABLE(i2c, mcp4725_id);
	383
	384	static struct i2c_driver mcp4725_driver = {
	385	.driver = {
	386	.name = MCP4725_DRV_NAME,
	387	.pm = MCP4725_PM_OPS,
	388	},
	389	.probe = mcp4725_probe,
fc52692c	390	.remove = mcp4725_remove,
cf35ad61 PM	391	.id_table = mcp4725_id,
	392	};
	393	module_i2c_driver(mcp4725_driver);
	394
	395	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
35f73967	396	MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");
cf35ad61	397	MODULE_LICENSE("GPL");