[mirror_ubuntu-jammy-kernel.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/regulator/consumer.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 dac_value;
	bool powerdown;
	unsigned powerdown_mode;
	struct regulator *vdd_reg;
};

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);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		*val = data->dac_value;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		ret = regulator_get_voltage(data->vdd_reg);
		if (ret < 0)
			return ret;

		*val = ret / 1000;
		*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 *pdata = dev_get_platdata(&client->dev);
	u8 inbuf[3];
	u8 pd;
	int err;

	if (!pdata) {
		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;

	data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
	if (IS_ERR(data->vdd_reg))
		return PTR_ERR(data->vdd_reg);

	err = regulator_enable(data->vdd_reg);
	if (err)
		return err;

	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;

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

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

	return 0;


err_disable_vdd_reg:
	regulator_disable(data->vdd_reg);

	return err;
}

static int mcp4725_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct mcp4725_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	regulator_disable(data->vdd_reg);

	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>
b440f1d9	21	#include <linux/regulator/consumer.h>
cf35ad61 PM	22
	23	#include <linux/iio/iio.h>
	24	#include <linux/iio/sysfs.h>
	25
	26	#include <linux/iio/dac/mcp4725.h>
	27
	28	#define MCP4725_DRV_NAME "mcp4725"
	29
	30	struct mcp4725_data {
	31	struct i2c_client *client;
cf35ad61	32	u16 dac_value;
155f1b41 PM	33	bool powerdown;
155f1b41 PM	34	unsigned powerdown_mode;
b440f1d9	35	struct regulator *vdd_reg;
cf35ad61 PM	36	};
cf35ad61 PM	37
cf35ad61 PM	38	static int mcp4725_suspend(struct device *dev)
cf35ad61 PM	39	{
a97dd069 PM	40	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	41	to_i2c_client(dev)));
cf35ad61 PM	42	u8 outbuf[2];
cf35ad61 PM	43
155f1b41	44	outbuf[0] = (data->powerdown_mode + 1) << 4;
cf35ad61	45	outbuf[1] = 0;
155f1b41	46	data->powerdown = true;
cf35ad61	47
a97dd069	48	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	49	}
	50
	51	static int mcp4725_resume(struct device *dev)
	52	{
a97dd069 PM	53	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	54	to_i2c_client(dev)));
cf35ad61 PM	55	u8 outbuf[2];
	56
	57	/* restore previous DAC value */
	58	outbuf[0] = (data->dac_value >> 8) & 0xf;
	59	outbuf[1] = data->dac_value & 0xff;
155f1b41	60	data->powerdown = false;
cf35ad61	61
a97dd069	62	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	63	}
cf35ad61 PM	64
155f1b41	65	#ifdef CONFIG_PM_SLEEP
cf35ad61 PM	66	static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
	67	#define MCP4725_PM_OPS (&mcp4725_pm_ops)
	68	#else
	69	#define MCP4725_PM_OPS NULL
	70	#endif
	71
4fd313da	72	static ssize_t mcp4725_store_eeprom(struct device *dev,
f17b77d6 PM	73	struct device_attribute attr, const char buf, size_t len)
	74	{
	75	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	76	struct mcp4725_data *data = iio_priv(indio_dev);
	77	int tries = 20;
	78	u8 inoutbuf[3];
	79	bool state;
	80	int ret;
	81
	82	ret = strtobool(buf, &state);
	83	if (ret < 0)
	84	return ret;
	85
	86	if (!state)
	87	return 0;
	88
	89	inoutbuf[0] = 0x60; /* write EEPROM */
	90	inoutbuf[1] = data->dac_value >> 4;
	91	inoutbuf[2] = (data->dac_value & 0xf) << 4;
	92
	93	ret = i2c_master_send(data->client, inoutbuf, 3);
	94	if (ret < 0)
	95	return ret;
	96	else if (ret != 3)
	97	return -EIO;
	98
	99	/* wait for write complete, takes up to 50ms */
	100	while (tries--) {
	101	msleep(20);
	102	ret = i2c_master_recv(data->client, inoutbuf, 3);
	103	if (ret < 0)
	104	return ret;
	105	else if (ret != 3)
	106	return -EIO;
	107
	108	if (inoutbuf[0] & 0x80)
	109	break;
	110	}
	111
	112	if (tries < 0) {
	113	dev_err(&data->client->dev,
	114	"mcp4725_store_eeprom() failed, incomplete\n");
	115	return -EIO;
	116	}
	117
	118	return len;
	119	}
	120
	121	static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);
	122
	123	static struct attribute *mcp4725_attributes[] = {
	124	&iio_dev_attr_store_eeprom.dev_attr.attr,
	125	NULL,
	126	};
	127
	128	static const struct attribute_group mcp4725_attribute_group = {
	129	.attrs = mcp4725_attributes,
	130	};
	131
155f1b41 PM	132	static const char * const mcp4725_powerdown_modes[] = {
	133	"1kohm_to_gnd",
	134	"100kohm_to_gnd",
	135	"500kohm_to_gnd"
	136	};
	137
35f73967 AM	138	static const char * const mcp4726_powerdown_modes[] = {
	139	"1kohm_to_gnd",
	140	"125kohm_to_gnd",
	141	"640kohm_to_gnd"
	142	};
	143
155f1b41 PM	144	static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	145	const struct iio_chan_spec *chan)
	146	{
	147	struct mcp4725_data *data = iio_priv(indio_dev);
	148
	149	return data->powerdown_mode;
	150	}
	151
	152	static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	153	const struct iio_chan_spec *chan, unsigned mode)
	154	{
	155	struct mcp4725_data *data = iio_priv(indio_dev);
	156
	157	data->powerdown_mode = mode;
	158
	159	return 0;
	160	}
	161
	162	static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	163	uintptr_t private, const struct iio_chan_spec chan, char buf)
	164	{
	165	struct mcp4725_data *data = iio_priv(indio_dev);
	166
	167	return sprintf(buf, "%d\n", data->powerdown);
	168	}
	169
	170	static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	171	uintptr_t private, const struct iio_chan_spec *chan,
	172	const char *buf, size_t len)
	173	{
	174	struct mcp4725_data *data = iio_priv(indio_dev);
	175	bool state;
	176	int ret;
	177
	178	ret = strtobool(buf, &state);
	179	if (ret)
	180	return ret;
	181
	182	if (state)
	183	ret = mcp4725_suspend(&data->client->dev);
	184	else
	185	ret = mcp4725_resume(&data->client->dev);
	186	if (ret < 0)
	187	return ret;
	188
	189	return len;
	190	}
	191
35f73967 AM	192	enum {
	193	MCP4725,
	194	MCP4726,
	195	};
	196
	197	static const struct iio_enum mcp472x_powerdown_mode_enum[] = {
	198	[MCP4725] = {
	199	.items = mcp4725_powerdown_modes,
	200	.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
	201	.get = mcp4725_get_powerdown_mode,
	202	.set = mcp4725_set_powerdown_mode,
	203	},
	204	[MCP4726] = {
	205	.items = mcp4726_powerdown_modes,
	206	.num_items = ARRAY_SIZE(mcp4726_powerdown_modes),
	207	.get = mcp4725_get_powerdown_mode,
	208	.set = mcp4725_set_powerdown_mode,
	209	},
155f1b41 PM	210	};
	211
	212	static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	213	{
	214	.name = "powerdown",
	215	.read = mcp4725_read_powerdown,
	216	.write = mcp4725_write_powerdown,
3704432f	217	.shared = IIO_SEPARATE,
155f1b41	218	},
35f73967 AM	219	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	220	&mcp472x_powerdown_mode_enum[MCP4725]),
	221	IIO_ENUM_AVAILABLE("powerdown_mode",
	222	&mcp472x_powerdown_mode_enum[MCP4725]),
	223	{ },
	224	};
	225
	226	static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = {
	227	{
	228	.name = "powerdown",
	229	.read = mcp4725_read_powerdown,
	230	.write = mcp4725_write_powerdown,
	231	.shared = IIO_SEPARATE,
	232	},
	233	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	234	&mcp472x_powerdown_mode_enum[MCP4726]),
	235	IIO_ENUM_AVAILABLE("powerdown_mode",
	236	&mcp472x_powerdown_mode_enum[MCP4726]),
155f1b41 PM	237	{ },
	238	};
	239
35f73967 AM	240	static const struct iio_chan_spec mcp472x_channel[] = {
	241	[MCP4725] = {
	242	.type = IIO_VOLTAGE,
	243	.indexed = 1,
	244	.output = 1,
	245	.channel = 0,
	246	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	247	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	248	.ext_info = mcp4725_ext_info,
	249	},
	250	[MCP4726] = {
	251	.type = IIO_VOLTAGE,
	252	.indexed = 1,
	253	.output = 1,
	254	.channel = 0,
	255	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	256	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	257	.ext_info = mcp4726_ext_info,
	258	},
cf35ad61 PM	259	};
	260
	261	static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
	262	{
	263	struct mcp4725_data *data = iio_priv(indio_dev);
	264	u8 outbuf[2];
	265	int ret;
	266
	267	if (val >= (1 << 12) \|\| val < 0)
	268	return -EINVAL;
	269
	270	outbuf[0] = (val >> 8) & 0xf;
	271	outbuf[1] = val & 0xff;
	272
	273	ret = i2c_master_send(data->client, outbuf, 2);
	274	if (ret < 0)
	275	return ret;
	276	else if (ret != 2)
	277	return -EIO;
	278	else
	279	return 0;
	280	}
	281
	282	static int mcp4725_read_raw(struct iio_dev *indio_dev,
	283	struct iio_chan_spec const *chan,
	284	int val, int val2, long mask)
	285	{
	286	struct mcp4725_data *data = iio_priv(indio_dev);
b440f1d9	287	int ret;
cf35ad61 PM	288
	289	switch (mask) {
	290	case IIO_CHAN_INFO_RAW:
	291	*val = data->dac_value;
	292	return IIO_VAL_INT;
	293	case IIO_CHAN_INFO_SCALE:
b440f1d9 TN	294	ret = regulator_get_voltage(data->vdd_reg);
	295	if (ret < 0)
	296	return ret;
	297
	298	*val = ret / 1000;
b117f96f LPC	299	*val2 = 12;
b117f96f LPC	300	return IIO_VAL_FRACTIONAL_LOG2;
cf35ad61 PM	301	}
	302	return -EINVAL;
	303	}
	304
	305	static int mcp4725_write_raw(struct iio_dev *indio_dev,
	306	struct iio_chan_spec const *chan,
	307	int val, int val2, long mask)
	308	{
	309	struct mcp4725_data *data = iio_priv(indio_dev);
	310	int ret;
	311
	312	switch (mask) {
	313	case IIO_CHAN_INFO_RAW:
	314	ret = mcp4725_set_value(indio_dev, val);
	315	data->dac_value = val;
	316	break;
	317	default:
	318	ret = -EINVAL;
	319	break;
	320	}
	321
	322	return ret;
	323	}
	324
	325	static const struct iio_info mcp4725_info = {
	326	.read_raw = mcp4725_read_raw,
	327	.write_raw = mcp4725_write_raw,
f17b77d6	328	.attrs = &mcp4725_attribute_group,
cf35ad61 PM	329	.driver_module = THIS_MODULE,
	330	};
	331
fc52692c GKH	332	static int mcp4725_probe(struct i2c_client *client,
fc52692c GKH	333	const struct i2c_device_id *id)
cf35ad61 PM	334	{
	335	struct mcp4725_data *data;
	336	struct iio_dev *indio_dev;
b440f1d9	337	struct mcp4725_platform_data *pdata = dev_get_platdata(&client->dev);
cf35ad61	338	u8 inbuf[3];
155f1b41	339	u8 pd;
cf35ad61 PM	340	int err;
cf35ad61 PM	341
b440f1d9	342	if (!pdata) {
cf35ad61	343	dev_err(&client->dev, "invalid platform data");
b6ff86f3	344	return -EINVAL;
cf35ad61 PM	345	}
cf35ad61 PM	346
b6ff86f3 PM	347	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	348	if (indio_dev == NULL)
	349	return -ENOMEM;
cf35ad61 PM	350	data = iio_priv(indio_dev);
	351	i2c_set_clientdata(client, indio_dev);
	352	data->client = client;
	353
b440f1d9 TN	354	data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
	355	if (IS_ERR(data->vdd_reg))
	356	return PTR_ERR(data->vdd_reg);
	357
	358	err = regulator_enable(data->vdd_reg);
	359	if (err)
	360	return err;
	361
cf35ad61	362	indio_dev->dev.parent = &client->dev;
97a249e9	363	indio_dev->name = id->name;
cf35ad61	364	indio_dev->info = &mcp4725_info;
35f73967	365	indio_dev->channels = &mcp472x_channel[id->driver_data];
cf35ad61 PM	366	indio_dev->num_channels = 1;
	367	indio_dev->modes = INDIO_DIRECT_MODE;
	368
cf35ad61 PM	369	/* read current DAC value */
	370	err = i2c_master_recv(client, inbuf, 3);
	371	if (err < 0) {
	372	dev_err(&client->dev, "failed to read DAC value");
b440f1d9	373	goto err_disable_vdd_reg;
cf35ad61	374	}
155f1b41 PM	375	pd = (inbuf[0] >> 1) & 0x3;
155f1b41 PM	376	data->powerdown = pd > 0 ? true : false;
6a31c225	377	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */
cf35ad61 PM	378	data->dac_value = (inbuf[1] << 4) \| (inbuf[2] >> 4);
cf35ad61 PM	379
b440f1d9 TN	380	err = iio_device_register(indio_dev);
	381	if (err)
	382	goto err_disable_vdd_reg;
	383
	384	return 0;
	385
	386
	387	err_disable_vdd_reg:
	388	regulator_disable(data->vdd_reg);
	389
	390	return err;
cf35ad61 PM	391	}
cf35ad61 PM	392
fc52692c	393	static int mcp4725_remove(struct i2c_client *client)
cf35ad61	394	{
b440f1d9 TN	395	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	396	struct mcp4725_data *data = iio_priv(indio_dev);
	397
	398	iio_device_unregister(indio_dev);
	399
	400	regulator_disable(data->vdd_reg);
	401
cf35ad61 PM	402	return 0;
	403	}
	404
	405	static const struct i2c_device_id mcp4725_id[] = {
35f73967 AM	406	{ "mcp4725", MCP4725 },
35f73967 AM	407	{ "mcp4726", MCP4726 },
cf35ad61 PM	408	{ }
	409	};
	410	MODULE_DEVICE_TABLE(i2c, mcp4725_id);
	411
	412	static struct i2c_driver mcp4725_driver = {
	413	.driver = {
	414	.name = MCP4725_DRV_NAME,
	415	.pm = MCP4725_PM_OPS,
	416	},
	417	.probe = mcp4725_probe,
fc52692c	418	.remove = mcp4725_remove,
cf35ad61 PM	419	.id_table = mcp4725_id,
	420	};
	421	module_i2c_driver(mcp4725_driver);
	422
	423	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
35f73967	424	MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");
cf35ad61	425	MODULE_LICENSE("GPL");