[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/of_device.h>
#include <linux/of.h>

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

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

#define MCP4725_DRV_NAME "mcp4725"

#define MCP472X_REF_VDD			0x00
#define MCP472X_REF_VREF_UNBUFFERED	0x02
#define MCP472X_REF_VREF_BUFFERED	0x03

struct mcp4725_data {
	struct i2c_client *client;
	int id;
	unsigned ref_mode;
	bool vref_buffered;
	u16 dac_value;
	bool powerdown;
	unsigned powerdown_mode;
	struct regulator *vdd_reg;
	struct regulator *vref_reg;
};

static int __maybe_unused 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 __maybe_unused 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);
}
static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);

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[0] |= data->ref_mode << 3;
	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 chip_id {
	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 mcp4726_set_cfg(struct iio_dev *indio_dev)
{
	struct mcp4725_data *data = iio_priv(indio_dev);
	u8 outbuf[3];
	int ret;

	outbuf[0] = 0x40;
	outbuf[0] |= data->ref_mode << 3;
	if (data->powerdown)
		outbuf[0] |= data->powerdown << 1;
	outbuf[1] = data->dac_value >> 4;
	outbuf[2] = (data->dac_value & 0xf) << 4;

	ret = i2c_master_send(data->client, outbuf, 3);
	if (ret < 0)
		return ret;
	else if (ret != 3)
		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:
		if (data->ref_mode == MCP472X_REF_VDD)
			ret = regulator_get_voltage(data->vdd_reg);
		else
			ret = regulator_get_voltage(data->vref_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,
};

#ifdef CONFIG_OF
static int mcp4725_probe_dt(struct device *dev,
			    struct mcp4725_platform_data *pdata)
{
	struct device_node *np = dev->of_node;

	if (!np)
		return -ENODEV;

	/* check if is the vref-supply defined */
	pdata->use_vref = of_property_read_bool(np, "vref-supply");
	pdata->vref_buffered =
		of_property_read_bool(np, "microchip,vref-buffered");

	return 0;
}
#else
static int mcp4725_probe_dt(struct device *dev,
			    struct mcp4725_platform_data *platform_data)
{
	return -ENODEV;
}
#endif

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, pdata_dt;
	u8 inbuf[4];
	u8 pd;
	u8 ref;
	int err;

	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;
	if (client->dev.of_node)
		data->id = (enum chip_id)of_device_get_match_data(&client->dev);
	else
		data->id = id->driver_data;
	pdata = dev_get_platdata(&client->dev);

	if (!pdata) {
		err = mcp4725_probe_dt(&client->dev, &pdata_dt);
		if (err) {
			dev_err(&client->dev,
				"invalid platform or devicetree data");
			return err;
		}
		pdata = &pdata_dt;
	}

	if (data->id == MCP4725 && pdata->use_vref) {
		dev_err(&client->dev,
			"external reference is unavailable on MCP4725");
		return -EINVAL;
	}

	if (!pdata->use_vref && pdata->vref_buffered) {
		dev_err(&client->dev,
			"buffering is unavailable on the internal reference");
		return -EINVAL;
	}

	if (!pdata->use_vref)
		data->ref_mode = MCP472X_REF_VDD;
	else
		data->ref_mode = pdata->vref_buffered ?
			MCP472X_REF_VREF_BUFFERED :
			MCP472X_REF_VREF_UNBUFFERED;

	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;

	if (pdata->use_vref) {
		data->vref_reg = devm_regulator_get(&client->dev, "vref");
		if (IS_ERR(data->vref_reg)) {
			err = PTR_ERR(data->vref_reg);
			goto err_disable_vdd_reg;
		}

		err = regulator_enable(data->vref_reg);
		if (err)
			goto err_disable_vdd_reg;
	}

	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 and settings */
	err = i2c_master_recv(client, inbuf, data->id == MCP4725 ? 3 : 4);

	if (err < 0) {
		dev_err(&client->dev, "failed to read DAC value");
		goto err_disable_vref_reg;
	}
	pd = (inbuf[0] >> 1) & 0x3;
	data->powerdown = pd > 0;
	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */
	data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);
	if (data->id == MCP4726)
		ref = (inbuf[3] >> 3) & 0x3;

	if (data->id == MCP4726 && ref != data->ref_mode) {
		dev_info(&client->dev,
			"voltage reference mode differs (conf: %u, eeprom: %u), setting %u",
			data->ref_mode, ref, data->ref_mode);
		err = mcp4726_set_cfg(indio_dev);
		if (err < 0)
			goto err_disable_vref_reg;
	}
 
	err = iio_device_register(indio_dev);
	if (err)
		goto err_disable_vref_reg;

	return 0;

err_disable_vref_reg:
	if (data->vref_reg)
		regulator_disable(data->vref_reg);

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);

	if (data->vref_reg)
		regulator_disable(data->vref_reg);
	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);

#ifdef CONFIG_OF
static const struct of_device_id mcp4725_of_match[] = {
	{
		.compatible = "microchip,mcp4725",
		.data = (void *)MCP4725
	},
	{
		.compatible = "microchip,mcp4726",
		.data = (void *)MCP4726
	},
	{ }
};
MODULE_DEVICE_TABLE(of, mcp4725_of_match);
#endif

static struct i2c_driver mcp4725_driver = {
	.driver = {
		.name	= MCP4725_DRV_NAME,
		.of_match_table = of_match_ptr(mcp4725_of_match),
		.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>
8414af1e	22	#include <linux/of_device.h>
88e39a88	23	#include <linux/of.h>
cf35ad61 PM	24
	25	#include <linux/iio/iio.h>
	26	#include <linux/iio/sysfs.h>
	27
	28	#include <linux/iio/dac/mcp4725.h>
	29
	30	#define MCP4725_DRV_NAME "mcp4725"
	31
29157c6d TN	32	#define MCP472X_REF_VDD 0x00
	33	#define MCP472X_REF_VREF_UNBUFFERED 0x02
	34	#define MCP472X_REF_VREF_BUFFERED 0x03
	35
cf35ad61 PM	36	struct mcp4725_data {
cf35ad61 PM	37	struct i2c_client *client;
29157c6d TN	38	int id;
	39	unsigned ref_mode;
	40	bool vref_buffered;
cf35ad61	41	u16 dac_value;
155f1b41 PM	42	bool powerdown;
155f1b41 PM	43	unsigned powerdown_mode;
b440f1d9	44	struct regulator *vdd_reg;
29157c6d	45	struct regulator *vref_reg;
cf35ad61 PM	46	};
cf35ad61 PM	47
1a5bc41a	48	static int __maybe_unused mcp4725_suspend(struct device *dev)
cf35ad61	49	{
a97dd069 PM	50	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	51	to_i2c_client(dev)));
cf35ad61 PM	52	u8 outbuf[2];
cf35ad61 PM	53
155f1b41	54	outbuf[0] = (data->powerdown_mode + 1) << 4;
cf35ad61	55	outbuf[1] = 0;
155f1b41	56	data->powerdown = true;
cf35ad61	57
a97dd069	58	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	59	}
cf35ad61 PM	60
1a5bc41a	61	static int __maybe_unused mcp4725_resume(struct device *dev)
cf35ad61	62	{
a97dd069 PM	63	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	64	to_i2c_client(dev)));
cf35ad61 PM	65	u8 outbuf[2];
	66
	67	/* restore previous DAC value */
	68	outbuf[0] = (data->dac_value >> 8) & 0xf;
	69	outbuf[1] = data->dac_value & 0xff;
155f1b41	70	data->powerdown = false;
cf35ad61	71
a97dd069	72	return i2c_master_send(data->client, outbuf, 2);
cf35ad61	73	}
cf35ad61	74	static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
cf35ad61	75
4fd313da	76	static ssize_t mcp4725_store_eeprom(struct device *dev,
f17b77d6 PM	77	struct device_attribute attr, const char buf, size_t len)
	78	{
	79	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	80	struct mcp4725_data *data = iio_priv(indio_dev);
	81	int tries = 20;
	82	u8 inoutbuf[3];
	83	bool state;
	84	int ret;
	85
	86	ret = strtobool(buf, &state);
	87	if (ret < 0)
	88	return ret;
	89
	90	if (!state)
	91	return 0;
	92
	93	inoutbuf[0] = 0x60; /* write EEPROM */
29157c6d	94	inoutbuf[0] \|= data->ref_mode << 3;
f17b77d6 PM	95	inoutbuf[1] = data->dac_value >> 4;
	96	inoutbuf[2] = (data->dac_value & 0xf) << 4;
	97
	98	ret = i2c_master_send(data->client, inoutbuf, 3);
	99	if (ret < 0)
	100	return ret;
	101	else if (ret != 3)
	102	return -EIO;
	103
	104	/* wait for write complete, takes up to 50ms */
	105	while (tries--) {
	106	msleep(20);
	107	ret = i2c_master_recv(data->client, inoutbuf, 3);
	108	if (ret < 0)
	109	return ret;
	110	else if (ret != 3)
	111	return -EIO;
	112
	113	if (inoutbuf[0] & 0x80)
	114	break;
	115	}
	116
	117	if (tries < 0) {
	118	dev_err(&data->client->dev,
	119	"mcp4725_store_eeprom() failed, incomplete\n");
	120	return -EIO;
	121	}
	122
	123	return len;
	124	}
	125
	126	static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);
	127
	128	static struct attribute *mcp4725_attributes[] = {
	129	&iio_dev_attr_store_eeprom.dev_attr.attr,
	130	NULL,
	131	};
	132
	133	static const struct attribute_group mcp4725_attribute_group = {
	134	.attrs = mcp4725_attributes,
	135	};
	136
155f1b41 PM	137	static const char * const mcp4725_powerdown_modes[] = {
	138	"1kohm_to_gnd",
	139	"100kohm_to_gnd",
	140	"500kohm_to_gnd"
	141	};
	142
35f73967 AM	143	static const char * const mcp4726_powerdown_modes[] = {
	144	"1kohm_to_gnd",
	145	"125kohm_to_gnd",
	146	"640kohm_to_gnd"
	147	};
	148
155f1b41 PM	149	static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	150	const struct iio_chan_spec *chan)
	151	{
	152	struct mcp4725_data *data = iio_priv(indio_dev);
	153
	154	return data->powerdown_mode;
	155	}
	156
	157	static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	158	const struct iio_chan_spec *chan, unsigned mode)
	159	{
	160	struct mcp4725_data *data = iio_priv(indio_dev);
	161
	162	data->powerdown_mode = mode;
	163
	164	return 0;
	165	}
	166
	167	static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	168	uintptr_t private, const struct iio_chan_spec chan, char buf)
	169	{
	170	struct mcp4725_data *data = iio_priv(indio_dev);
	171
	172	return sprintf(buf, "%d\n", data->powerdown);
	173	}
	174
	175	static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	176	uintptr_t private, const struct iio_chan_spec *chan,
	177	const char *buf, size_t len)
	178	{
	179	struct mcp4725_data *data = iio_priv(indio_dev);
	180	bool state;
	181	int ret;
	182
	183	ret = strtobool(buf, &state);
	184	if (ret)
	185	return ret;
	186
	187	if (state)
	188	ret = mcp4725_suspend(&data->client->dev);
	189	else
	190	ret = mcp4725_resume(&data->client->dev);
	191	if (ret < 0)
	192	return ret;
	193
	194	return len;
	195	}
	196
8414af1e	197	enum chip_id {
35f73967 AM	198	MCP4725,
	199	MCP4726,
	200	};
	201
	202	static const struct iio_enum mcp472x_powerdown_mode_enum[] = {
	203	[MCP4725] = {
	204	.items = mcp4725_powerdown_modes,
	205	.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
	206	.get = mcp4725_get_powerdown_mode,
	207	.set = mcp4725_set_powerdown_mode,
	208	},
	209	[MCP4726] = {
	210	.items = mcp4726_powerdown_modes,
	211	.num_items = ARRAY_SIZE(mcp4726_powerdown_modes),
	212	.get = mcp4725_get_powerdown_mode,
	213	.set = mcp4725_set_powerdown_mode,
	214	},
155f1b41 PM	215	};
	216
	217	static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	218	{
	219	.name = "powerdown",
	220	.read = mcp4725_read_powerdown,
	221	.write = mcp4725_write_powerdown,
3704432f	222	.shared = IIO_SEPARATE,
155f1b41	223	},
35f73967 AM	224	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	225	&mcp472x_powerdown_mode_enum[MCP4725]),
	226	IIO_ENUM_AVAILABLE("powerdown_mode",
	227	&mcp472x_powerdown_mode_enum[MCP4725]),
	228	{ },
	229	};
	230
	231	static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = {
	232	{
	233	.name = "powerdown",
	234	.read = mcp4725_read_powerdown,
	235	.write = mcp4725_write_powerdown,
	236	.shared = IIO_SEPARATE,
	237	},
	238	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	239	&mcp472x_powerdown_mode_enum[MCP4726]),
	240	IIO_ENUM_AVAILABLE("powerdown_mode",
	241	&mcp472x_powerdown_mode_enum[MCP4726]),
155f1b41 PM	242	{ },
	243	};
	244
35f73967 AM	245	static const struct iio_chan_spec mcp472x_channel[] = {
	246	[MCP4725] = {
	247	.type = IIO_VOLTAGE,
	248	.indexed = 1,
	249	.output = 1,
	250	.channel = 0,
	251	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	252	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	253	.ext_info = mcp4725_ext_info,
	254	},
	255	[MCP4726] = {
	256	.type = IIO_VOLTAGE,
	257	.indexed = 1,
	258	.output = 1,
	259	.channel = 0,
	260	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	261	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	262	.ext_info = mcp4726_ext_info,
	263	},
cf35ad61 PM	264	};
	265
	266	static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
	267	{
	268	struct mcp4725_data *data = iio_priv(indio_dev);
	269	u8 outbuf[2];
	270	int ret;
	271
	272	if (val >= (1 << 12) \|\| val < 0)
	273	return -EINVAL;
	274
	275	outbuf[0] = (val >> 8) & 0xf;
	276	outbuf[1] = val & 0xff;
	277
	278	ret = i2c_master_send(data->client, outbuf, 2);
	279	if (ret < 0)
	280	return ret;
	281	else if (ret != 2)
	282	return -EIO;
	283	else
	284	return 0;
	285	}
	286
29157c6d TN	287	static int mcp4726_set_cfg(struct iio_dev *indio_dev)
	288	{
	289	struct mcp4725_data *data = iio_priv(indio_dev);
	290	u8 outbuf[3];
	291	int ret;
	292
	293	outbuf[0] = 0x40;
	294	outbuf[0] \|= data->ref_mode << 3;
	295	if (data->powerdown)
	296	outbuf[0] \|= data->powerdown << 1;
	297	outbuf[1] = data->dac_value >> 4;
	298	outbuf[2] = (data->dac_value & 0xf) << 4;
	299
	300	ret = i2c_master_send(data->client, outbuf, 3);
	301	if (ret < 0)
	302	return ret;
	303	else if (ret != 3)
	304	return -EIO;
	305	else
	306	return 0;
	307	}
	308
cf35ad61 PM	309	static int mcp4725_read_raw(struct iio_dev *indio_dev,
	310	struct iio_chan_spec const *chan,
	311	int val, int val2, long mask)
	312	{
	313	struct mcp4725_data *data = iio_priv(indio_dev);
b440f1d9	314	int ret;
cf35ad61 PM	315
	316	switch (mask) {
	317	case IIO_CHAN_INFO_RAW:
	318	*val = data->dac_value;
	319	return IIO_VAL_INT;
	320	case IIO_CHAN_INFO_SCALE:
29157c6d TN	321	if (data->ref_mode == MCP472X_REF_VDD)
	322	ret = regulator_get_voltage(data->vdd_reg);
	323	else
	324	ret = regulator_get_voltage(data->vref_reg);
	325
b440f1d9 TN	326	if (ret < 0)
	327	return ret;
	328
	329	*val = ret / 1000;
b117f96f LPC	330	*val2 = 12;
b117f96f LPC	331	return IIO_VAL_FRACTIONAL_LOG2;
cf35ad61 PM	332	}
	333	return -EINVAL;
	334	}
	335
	336	static int mcp4725_write_raw(struct iio_dev *indio_dev,
	337	struct iio_chan_spec const *chan,
	338	int val, int val2, long mask)
	339	{
	340	struct mcp4725_data *data = iio_priv(indio_dev);
	341	int ret;
	342
	343	switch (mask) {
	344	case IIO_CHAN_INFO_RAW:
	345	ret = mcp4725_set_value(indio_dev, val);
	346	data->dac_value = val;
	347	break;
	348	default:
	349	ret = -EINVAL;
	350	break;
	351	}
	352
	353	return ret;
	354	}
	355
	356	static const struct iio_info mcp4725_info = {
	357	.read_raw = mcp4725_read_raw,
	358	.write_raw = mcp4725_write_raw,
f17b77d6	359	.attrs = &mcp4725_attribute_group,
cf35ad61 PM	360	};
cf35ad61 PM	361
88e39a88 TN	362	#ifdef CONFIG_OF
	363	static int mcp4725_probe_dt(struct device *dev,
	364	struct mcp4725_platform_data *pdata)
	365	{
	366	struct device_node *np = dev->of_node;
	367
	368	if (!np)
	369	return -ENODEV;
	370
	371	/* check if is the vref-supply defined */
	372	pdata->use_vref = of_property_read_bool(np, "vref-supply");
	373	pdata->vref_buffered =
	374	of_property_read_bool(np, "microchip,vref-buffered");
	375
	376	return 0;
	377	}
	378	#else
	379	static int mcp4725_probe_dt(struct device *dev,
	380	struct mcp4725_platform_data *platform_data)
	381	{
	382	return -ENODEV;
	383	}
	384	#endif
	385
fc52692c GKH	386	static int mcp4725_probe(struct i2c_client *client,
fc52692c GKH	387	const struct i2c_device_id *id)
cf35ad61 PM	388	{
	389	struct mcp4725_data *data;
	390	struct iio_dev *indio_dev;
88e39a88	391	struct mcp4725_platform_data *pdata, pdata_dt;
29157c6d	392	u8 inbuf[4];
155f1b41	393	u8 pd;
29157c6d	394	u8 ref;
cf35ad61 PM	395	int err;
cf35ad61 PM	396
b6ff86f3 PM	397	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	398	if (indio_dev == NULL)
	399	return -ENOMEM;
cf35ad61 PM	400	data = iio_priv(indio_dev);
	401	i2c_set_clientdata(client, indio_dev);
	402	data->client = client;
8414af1e JMC	403	if (client->dev.of_node)
	404	data->id = (enum chip_id)of_device_get_match_data(&client->dev);
	405	else
	406	data->id = id->driver_data;
88e39a88 TN	407	pdata = dev_get_platdata(&client->dev);
	408
	409	if (!pdata) {
	410	err = mcp4725_probe_dt(&client->dev, &pdata_dt);
	411	if (err) {
	412	dev_err(&client->dev,
	413	"invalid platform or devicetree data");
	414	return err;
	415	}
	416	pdata = &pdata_dt;
	417	}
29157c6d TN	418
	419	if (data->id == MCP4725 && pdata->use_vref) {
	420	dev_err(&client->dev,
	421	"external reference is unavailable on MCP4725");
	422	return -EINVAL;
	423	}
	424
	425	if (!pdata->use_vref && pdata->vref_buffered) {
	426	dev_err(&client->dev,
	427	"buffering is unavailable on the internal reference");
	428	return -EINVAL;
	429	}
	430
	431	if (!pdata->use_vref)
	432	data->ref_mode = MCP472X_REF_VDD;
	433	else
	434	data->ref_mode = pdata->vref_buffered ?
	435	MCP472X_REF_VREF_BUFFERED :
	436	MCP472X_REF_VREF_UNBUFFERED;
cf35ad61	437
b440f1d9 TN	438	data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
	439	if (IS_ERR(data->vdd_reg))
	440	return PTR_ERR(data->vdd_reg);
	441
	442	err = regulator_enable(data->vdd_reg);
	443	if (err)
	444	return err;
	445
29157c6d TN	446	if (pdata->use_vref) {
	447	data->vref_reg = devm_regulator_get(&client->dev, "vref");
	448	if (IS_ERR(data->vref_reg)) {
30df2d18	449	err = PTR_ERR(data->vref_reg);
29157c6d TN	450	goto err_disable_vdd_reg;
	451	}
	452
	453	err = regulator_enable(data->vref_reg);
	454	if (err)
	455	goto err_disable_vdd_reg;
	456	}
	457
cf35ad61	458	indio_dev->dev.parent = &client->dev;
97a249e9	459	indio_dev->name = id->name;
cf35ad61	460	indio_dev->info = &mcp4725_info;
35f73967	461	indio_dev->channels = &mcp472x_channel[id->driver_data];
cf35ad61 PM	462	indio_dev->num_channels = 1;
	463	indio_dev->modes = INDIO_DIRECT_MODE;
	464
29157c6d TN	465	/* read current DAC value and settings */
	466	err = i2c_master_recv(client, inbuf, data->id == MCP4725 ? 3 : 4);
	467
cf35ad61 PM	468	if (err < 0) {
cf35ad61 PM	469	dev_err(&client->dev, "failed to read DAC value");
29157c6d	470	goto err_disable_vref_reg;
cf35ad61	471	}
155f1b41	472	pd = (inbuf[0] >> 1) & 0x3;
f272f19c	473	data->powerdown = pd > 0;
6a31c225	474	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */
cf35ad61	475	data->dac_value = (inbuf[1] << 4) \| (inbuf[2] >> 4);
29157c6d TN	476	if (data->id == MCP4726)
	477	ref = (inbuf[3] >> 3) & 0x3;
	478
	479	if (data->id == MCP4726 && ref != data->ref_mode) {
	480	dev_info(&client->dev,
	481	"voltage reference mode differs (conf: %u, eeprom: %u), setting %u",
	482	data->ref_mode, ref, data->ref_mode);
	483	err = mcp4726_set_cfg(indio_dev);
	484	if (err < 0)
	485	goto err_disable_vref_reg;
	486	}
	487
b440f1d9 TN	488	err = iio_device_register(indio_dev);
b440f1d9 TN	489	if (err)
29157c6d	490	goto err_disable_vref_reg;
b440f1d9 TN	491
	492	return 0;
	493
29157c6d TN	494	err_disable_vref_reg:
	495	if (data->vref_reg)
	496	regulator_disable(data->vref_reg);
b440f1d9 TN	497
	498	err_disable_vdd_reg:
	499	regulator_disable(data->vdd_reg);
	500
	501	return err;
cf35ad61 PM	502	}
cf35ad61 PM	503
fc52692c	504	static int mcp4725_remove(struct i2c_client *client)
cf35ad61	505	{
b440f1d9 TN	506	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	507	struct mcp4725_data *data = iio_priv(indio_dev);
	508
	509	iio_device_unregister(indio_dev);
	510
29157c6d TN	511	if (data->vref_reg)
29157c6d TN	512	regulator_disable(data->vref_reg);
b440f1d9 TN	513	regulator_disable(data->vdd_reg);
b440f1d9 TN	514
cf35ad61 PM	515	return 0;
	516	}
	517
	518	static const struct i2c_device_id mcp4725_id[] = {
35f73967 AM	519	{ "mcp4725", MCP4725 },
35f73967 AM	520	{ "mcp4726", MCP4726 },
cf35ad61 PM	521	{ }
	522	};
	523	MODULE_DEVICE_TABLE(i2c, mcp4725_id);
	524
8414af1e JMC	525	#ifdef CONFIG_OF
	526	static const struct of_device_id mcp4725_of_match[] = {
	527	{
	528	.compatible = "microchip,mcp4725",
	529	.data = (void *)MCP4725
	530	},
	531	{
	532	.compatible = "microchip,mcp4726",
	533	.data = (void *)MCP4726
	534	},
	535	{ }
	536	};
	537	MODULE_DEVICE_TABLE(of, mcp4725_of_match);
	538	#endif
	539
cf35ad61 PM	540	static struct i2c_driver mcp4725_driver = {
	541	.driver = {
	542	.name = MCP4725_DRV_NAME,
8414af1e	543	.of_match_table = of_match_ptr(mcp4725_of_match),
1a5bc41a	544	.pm = &mcp4725_pm_ops,
cf35ad61 PM	545	},
cf35ad61 PM	546	.probe = mcp4725_probe,
fc52692c	547	.remove = mcp4725_remove,
cf35ad61 PM	548	.id_table = mcp4725_id,
	549	};
	550	module_i2c_driver(mcp4725_driver);
	551
	552	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
35f73967	553	MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");
cf35ad61	554	MODULE_LICENSE("GPL");