[mirror_ubuntu-jammy-kernel.git] / drivers / iio / dac / mcp4725.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * mcp4725.c - Support for Microchip MCP4725/6
 *
 * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * Based on max517 by Roland Stigge <stigge@antcom.de>
 *
 * 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[0] |= data->powerdown ? ((data->powerdown_mode + 1) << 1) : 0;
	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
36edc939	1	// SPDX-License-Identifier: GPL-2.0-only
cf35ad61	2	/*
35f73967	3	* mcp4725.c - Support for Microchip MCP4725/6
cf35ad61 PM	4	*
	5	* Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
	6	*
	7	* Based on max517 by Roland Stigge <stigge@antcom.de>
	8	*
cf35ad61 PM	9	* driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
	10	* (7-bit I2C slave address 0x60, the three LSBs can be configured in
	11	* hardware)
cf35ad61 PM	12	*/
	13
	14	#include <linux/module.h>
cf35ad61 PM	15	#include <linux/i2c.h>
cf35ad61 PM	16	#include <linux/err.h>
f17b77d6	17	#include <linux/delay.h>
b440f1d9	18	#include <linux/regulator/consumer.h>
8414af1e	19	#include <linux/of_device.h>
88e39a88	20	#include <linux/of.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
29157c6d TN	29	#define MCP472X_REF_VDD 0x00
	30	#define MCP472X_REF_VREF_UNBUFFERED 0x02
	31	#define MCP472X_REF_VREF_BUFFERED 0x03
	32
cf35ad61 PM	33	struct mcp4725_data {
cf35ad61 PM	34	struct i2c_client *client;
29157c6d TN	35	int id;
	36	unsigned ref_mode;
	37	bool vref_buffered;
cf35ad61	38	u16 dac_value;
155f1b41 PM	39	bool powerdown;
155f1b41 PM	40	unsigned powerdown_mode;
b440f1d9	41	struct regulator *vdd_reg;
29157c6d	42	struct regulator *vref_reg;
cf35ad61 PM	43	};
cf35ad61 PM	44
1a5bc41a	45	static int __maybe_unused mcp4725_suspend(struct device *dev)
cf35ad61	46	{
a97dd069 PM	47	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	48	to_i2c_client(dev)));
cf35ad61 PM	49	u8 outbuf[2];
cf35ad61 PM	50
155f1b41	51	outbuf[0] = (data->powerdown_mode + 1) << 4;
cf35ad61	52	outbuf[1] = 0;
155f1b41	53	data->powerdown = true;
cf35ad61	54
a97dd069	55	return i2c_master_send(data->client, outbuf, 2);
cf35ad61 PM	56	}
cf35ad61 PM	57
1a5bc41a	58	static int __maybe_unused mcp4725_resume(struct device *dev)
cf35ad61	59	{
a97dd069 PM	60	struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
a97dd069 PM	61	to_i2c_client(dev)));
cf35ad61 PM	62	u8 outbuf[2];
	63
	64	/* restore previous DAC value */
	65	outbuf[0] = (data->dac_value >> 8) & 0xf;
	66	outbuf[1] = data->dac_value & 0xff;
155f1b41	67	data->powerdown = false;
cf35ad61	68
a97dd069	69	return i2c_master_send(data->client, outbuf, 2);
cf35ad61	70	}
cf35ad61	71	static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
cf35ad61	72
4fd313da	73	static ssize_t mcp4725_store_eeprom(struct device *dev,
f17b77d6 PM	74	struct device_attribute attr, const char buf, size_t len)
	75	{
	76	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	77	struct mcp4725_data *data = iio_priv(indio_dev);
	78	int tries = 20;
	79	u8 inoutbuf[3];
	80	bool state;
	81	int ret;
	82
	83	ret = strtobool(buf, &state);
	84	if (ret < 0)
	85	return ret;
	86
	87	if (!state)
	88	return 0;
	89
	90	inoutbuf[0] = 0x60; /* write EEPROM */
29157c6d	91	inoutbuf[0] \|= data->ref_mode << 3;
06003531	92	inoutbuf[0] \|= data->powerdown ? ((data->powerdown_mode + 1) << 1) : 0;
f17b77d6 PM	93	inoutbuf[1] = data->dac_value >> 4;
	94	inoutbuf[2] = (data->dac_value & 0xf) << 4;
	95
	96	ret = i2c_master_send(data->client, inoutbuf, 3);
	97	if (ret < 0)
	98	return ret;
	99	else if (ret != 3)
	100	return -EIO;
	101
	102	/* wait for write complete, takes up to 50ms */
	103	while (tries--) {
	104	msleep(20);
	105	ret = i2c_master_recv(data->client, inoutbuf, 3);
	106	if (ret < 0)
	107	return ret;
	108	else if (ret != 3)
	109	return -EIO;
	110
	111	if (inoutbuf[0] & 0x80)
	112	break;
	113	}
	114
	115	if (tries < 0) {
	116	dev_err(&data->client->dev,
	117	"mcp4725_store_eeprom() failed, incomplete\n");
	118	return -EIO;
	119	}
	120
	121	return len;
	122	}
	123
	124	static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);
	125
	126	static struct attribute *mcp4725_attributes[] = {
	127	&iio_dev_attr_store_eeprom.dev_attr.attr,
	128	NULL,
	129	};
	130
	131	static const struct attribute_group mcp4725_attribute_group = {
	132	.attrs = mcp4725_attributes,
	133	};
	134
155f1b41 PM	135	static const char * const mcp4725_powerdown_modes[] = {
	136	"1kohm_to_gnd",
	137	"100kohm_to_gnd",
	138	"500kohm_to_gnd"
	139	};
	140
35f73967 AM	141	static const char * const mcp4726_powerdown_modes[] = {
	142	"1kohm_to_gnd",
	143	"125kohm_to_gnd",
	144	"640kohm_to_gnd"
	145	};
	146
155f1b41 PM	147	static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	148	const struct iio_chan_spec *chan)
	149	{
	150	struct mcp4725_data *data = iio_priv(indio_dev);
	151
	152	return data->powerdown_mode;
	153	}
	154
	155	static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	156	const struct iio_chan_spec *chan, unsigned mode)
	157	{
	158	struct mcp4725_data *data = iio_priv(indio_dev);
	159
	160	data->powerdown_mode = mode;
	161
	162	return 0;
	163	}
	164
	165	static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	166	uintptr_t private, const struct iio_chan_spec chan, char buf)
	167	{
	168	struct mcp4725_data *data = iio_priv(indio_dev);
	169
	170	return sprintf(buf, "%d\n", data->powerdown);
	171	}
	172
	173	static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	174	uintptr_t private, const struct iio_chan_spec *chan,
	175	const char *buf, size_t len)
	176	{
	177	struct mcp4725_data *data = iio_priv(indio_dev);
	178	bool state;
	179	int ret;
	180
	181	ret = strtobool(buf, &state);
	182	if (ret)
	183	return ret;
	184
	185	if (state)
	186	ret = mcp4725_suspend(&data->client->dev);
	187	else
	188	ret = mcp4725_resume(&data->client->dev);
	189	if (ret < 0)
	190	return ret;
	191
	192	return len;
	193	}
	194
8414af1e	195	enum chip_id {
35f73967 AM	196	MCP4725,
	197	MCP4726,
	198	};
	199
	200	static const struct iio_enum mcp472x_powerdown_mode_enum[] = {
	201	[MCP4725] = {
	202	.items = mcp4725_powerdown_modes,
	203	.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
	204	.get = mcp4725_get_powerdown_mode,
	205	.set = mcp4725_set_powerdown_mode,
	206	},
	207	[MCP4726] = {
	208	.items = mcp4726_powerdown_modes,
	209	.num_items = ARRAY_SIZE(mcp4726_powerdown_modes),
	210	.get = mcp4725_get_powerdown_mode,
	211	.set = mcp4725_set_powerdown_mode,
	212	},
155f1b41 PM	213	};
	214
	215	static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	216	{
	217	.name = "powerdown",
	218	.read = mcp4725_read_powerdown,
	219	.write = mcp4725_write_powerdown,
3704432f	220	.shared = IIO_SEPARATE,
155f1b41	221	},
35f73967 AM	222	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	223	&mcp472x_powerdown_mode_enum[MCP4725]),
	224	IIO_ENUM_AVAILABLE("powerdown_mode",
	225	&mcp472x_powerdown_mode_enum[MCP4725]),
	226	{ },
	227	};
	228
	229	static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = {
	230	{
	231	.name = "powerdown",
	232	.read = mcp4725_read_powerdown,
	233	.write = mcp4725_write_powerdown,
	234	.shared = IIO_SEPARATE,
	235	},
	236	IIO_ENUM("powerdown_mode", IIO_SEPARATE,
	237	&mcp472x_powerdown_mode_enum[MCP4726]),
	238	IIO_ENUM_AVAILABLE("powerdown_mode",
	239	&mcp472x_powerdown_mode_enum[MCP4726]),
155f1b41 PM	240	{ },
	241	};
	242
35f73967 AM	243	static const struct iio_chan_spec mcp472x_channel[] = {
	244	[MCP4725] = {
	245	.type = IIO_VOLTAGE,
	246	.indexed = 1,
	247	.output = 1,
	248	.channel = 0,
	249	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	250	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	251	.ext_info = mcp4725_ext_info,
	252	},
	253	[MCP4726] = {
	254	.type = IIO_VOLTAGE,
	255	.indexed = 1,
	256	.output = 1,
	257	.channel = 0,
	258	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	259	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
	260	.ext_info = mcp4726_ext_info,
	261	},
cf35ad61 PM	262	};
	263
	264	static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
	265	{
	266	struct mcp4725_data *data = iio_priv(indio_dev);
	267	u8 outbuf[2];
	268	int ret;
	269
	270	if (val >= (1 << 12) \|\| val < 0)
	271	return -EINVAL;
	272
	273	outbuf[0] = (val >> 8) & 0xf;
	274	outbuf[1] = val & 0xff;
	275
	276	ret = i2c_master_send(data->client, outbuf, 2);
	277	if (ret < 0)
	278	return ret;
	279	else if (ret != 2)
	280	return -EIO;
	281	else
	282	return 0;
	283	}
	284
29157c6d TN	285	static int mcp4726_set_cfg(struct iio_dev *indio_dev)
	286	{
	287	struct mcp4725_data *data = iio_priv(indio_dev);
	288	u8 outbuf[3];
	289	int ret;
	290
	291	outbuf[0] = 0x40;
	292	outbuf[0] \|= data->ref_mode << 3;
	293	if (data->powerdown)
	294	outbuf[0] \|= data->powerdown << 1;
	295	outbuf[1] = data->dac_value >> 4;
	296	outbuf[2] = (data->dac_value & 0xf) << 4;
	297
	298	ret = i2c_master_send(data->client, outbuf, 3);
	299	if (ret < 0)
	300	return ret;
	301	else if (ret != 3)
	302	return -EIO;
	303	else
	304	return 0;
	305	}
	306
cf35ad61 PM	307	static int mcp4725_read_raw(struct iio_dev *indio_dev,
	308	struct iio_chan_spec const *chan,
	309	int val, int val2, long mask)
	310	{
	311	struct mcp4725_data *data = iio_priv(indio_dev);
b440f1d9	312	int ret;
cf35ad61 PM	313
	314	switch (mask) {
	315	case IIO_CHAN_INFO_RAW:
	316	*val = data->dac_value;
	317	return IIO_VAL_INT;
	318	case IIO_CHAN_INFO_SCALE:
29157c6d TN	319	if (data->ref_mode == MCP472X_REF_VDD)
	320	ret = regulator_get_voltage(data->vdd_reg);
	321	else
	322	ret = regulator_get_voltage(data->vref_reg);
	323
b440f1d9 TN	324	if (ret < 0)
	325	return ret;
	326
	327	*val = ret / 1000;
b117f96f LPC	328	*val2 = 12;
b117f96f LPC	329	return IIO_VAL_FRACTIONAL_LOG2;
cf35ad61 PM	330	}
	331	return -EINVAL;
	332	}
	333
	334	static int mcp4725_write_raw(struct iio_dev *indio_dev,
	335	struct iio_chan_spec const *chan,
	336	int val, int val2, long mask)
	337	{
	338	struct mcp4725_data *data = iio_priv(indio_dev);
	339	int ret;
	340
	341	switch (mask) {
	342	case IIO_CHAN_INFO_RAW:
	343	ret = mcp4725_set_value(indio_dev, val);
	344	data->dac_value = val;
	345	break;
	346	default:
	347	ret = -EINVAL;
	348	break;
	349	}
	350
	351	return ret;
	352	}
	353
	354	static const struct iio_info mcp4725_info = {
	355	.read_raw = mcp4725_read_raw,
	356	.write_raw = mcp4725_write_raw,
f17b77d6	357	.attrs = &mcp4725_attribute_group,
cf35ad61 PM	358	};
cf35ad61 PM	359
88e39a88 TN	360	#ifdef CONFIG_OF
	361	static int mcp4725_probe_dt(struct device *dev,
	362	struct mcp4725_platform_data *pdata)
	363	{
	364	struct device_node *np = dev->of_node;
	365
	366	if (!np)
	367	return -ENODEV;
	368
	369	/* check if is the vref-supply defined */
	370	pdata->use_vref = of_property_read_bool(np, "vref-supply");
	371	pdata->vref_buffered =
	372	of_property_read_bool(np, "microchip,vref-buffered");
	373
	374	return 0;
	375	}
	376	#else
	377	static int mcp4725_probe_dt(struct device *dev,
	378	struct mcp4725_platform_data *platform_data)
	379	{
	380	return -ENODEV;
	381	}
	382	#endif
	383
fc52692c GKH	384	static int mcp4725_probe(struct i2c_client *client,
fc52692c GKH	385	const struct i2c_device_id *id)
cf35ad61 PM	386	{
	387	struct mcp4725_data *data;
	388	struct iio_dev *indio_dev;
88e39a88	389	struct mcp4725_platform_data *pdata, pdata_dt;
29157c6d	390	u8 inbuf[4];
155f1b41	391	u8 pd;
29157c6d	392	u8 ref;
cf35ad61 PM	393	int err;
cf35ad61 PM	394
b6ff86f3 PM	395	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	396	if (indio_dev == NULL)
	397	return -ENOMEM;
cf35ad61 PM	398	data = iio_priv(indio_dev);
	399	i2c_set_clientdata(client, indio_dev);
	400	data->client = client;
8414af1e JMC	401	if (client->dev.of_node)
	402	data->id = (enum chip_id)of_device_get_match_data(&client->dev);
	403	else
	404	data->id = id->driver_data;
88e39a88 TN	405	pdata = dev_get_platdata(&client->dev);
	406
	407	if (!pdata) {
	408	err = mcp4725_probe_dt(&client->dev, &pdata_dt);
	409	if (err) {
	410	dev_err(&client->dev,
	411	"invalid platform or devicetree data");
	412	return err;
	413	}
	414	pdata = &pdata_dt;
	415	}
29157c6d TN	416
	417	if (data->id == MCP4725 && pdata->use_vref) {
	418	dev_err(&client->dev,
	419	"external reference is unavailable on MCP4725");
	420	return -EINVAL;
	421	}
	422
	423	if (!pdata->use_vref && pdata->vref_buffered) {
	424	dev_err(&client->dev,
	425	"buffering is unavailable on the internal reference");
	426	return -EINVAL;
	427	}
	428
	429	if (!pdata->use_vref)
	430	data->ref_mode = MCP472X_REF_VDD;
	431	else
	432	data->ref_mode = pdata->vref_buffered ?
	433	MCP472X_REF_VREF_BUFFERED :
	434	MCP472X_REF_VREF_UNBUFFERED;
cf35ad61	435
b440f1d9 TN	436	data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
	437	if (IS_ERR(data->vdd_reg))
	438	return PTR_ERR(data->vdd_reg);
	439
	440	err = regulator_enable(data->vdd_reg);
	441	if (err)
	442	return err;
	443
29157c6d TN	444	if (pdata->use_vref) {
	445	data->vref_reg = devm_regulator_get(&client->dev, "vref");
	446	if (IS_ERR(data->vref_reg)) {
30df2d18	447	err = PTR_ERR(data->vref_reg);
29157c6d TN	448	goto err_disable_vdd_reg;
	449	}
	450
	451	err = regulator_enable(data->vref_reg);
	452	if (err)
	453	goto err_disable_vdd_reg;
	454	}
	455
cf35ad61	456	indio_dev->dev.parent = &client->dev;
97a249e9	457	indio_dev->name = id->name;
cf35ad61	458	indio_dev->info = &mcp4725_info;
35f73967	459	indio_dev->channels = &mcp472x_channel[id->driver_data];
cf35ad61 PM	460	indio_dev->num_channels = 1;
	461	indio_dev->modes = INDIO_DIRECT_MODE;
	462
29157c6d TN	463	/* read current DAC value and settings */
	464	err = i2c_master_recv(client, inbuf, data->id == MCP4725 ? 3 : 4);
	465
cf35ad61 PM	466	if (err < 0) {
cf35ad61 PM	467	dev_err(&client->dev, "failed to read DAC value");
29157c6d	468	goto err_disable_vref_reg;
cf35ad61	469	}
155f1b41	470	pd = (inbuf[0] >> 1) & 0x3;
f272f19c	471	data->powerdown = pd > 0;
6a31c225	472	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */
cf35ad61	473	data->dac_value = (inbuf[1] << 4) \| (inbuf[2] >> 4);
29157c6d TN	474	if (data->id == MCP4726)
	475	ref = (inbuf[3] >> 3) & 0x3;
	476
	477	if (data->id == MCP4726 && ref != data->ref_mode) {
	478	dev_info(&client->dev,
	479	"voltage reference mode differs (conf: %u, eeprom: %u), setting %u",
	480	data->ref_mode, ref, data->ref_mode);
	481	err = mcp4726_set_cfg(indio_dev);
	482	if (err < 0)
	483	goto err_disable_vref_reg;
	484	}
	485
b440f1d9 TN	486	err = iio_device_register(indio_dev);
b440f1d9 TN	487	if (err)
29157c6d	488	goto err_disable_vref_reg;
b440f1d9 TN	489
	490	return 0;
	491
29157c6d TN	492	err_disable_vref_reg:
	493	if (data->vref_reg)
	494	regulator_disable(data->vref_reg);
b440f1d9 TN	495
	496	err_disable_vdd_reg:
	497	regulator_disable(data->vdd_reg);
	498
	499	return err;
cf35ad61 PM	500	}
cf35ad61 PM	501
fc52692c	502	static int mcp4725_remove(struct i2c_client *client)
cf35ad61	503	{
b440f1d9 TN	504	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	505	struct mcp4725_data *data = iio_priv(indio_dev);
	506
	507	iio_device_unregister(indio_dev);
	508
29157c6d TN	509	if (data->vref_reg)
29157c6d TN	510	regulator_disable(data->vref_reg);
b440f1d9 TN	511	regulator_disable(data->vdd_reg);
b440f1d9 TN	512
cf35ad61 PM	513	return 0;
	514	}
	515
	516	static const struct i2c_device_id mcp4725_id[] = {
35f73967 AM	517	{ "mcp4725", MCP4725 },
35f73967 AM	518	{ "mcp4726", MCP4726 },
cf35ad61 PM	519	{ }
	520	};
	521	MODULE_DEVICE_TABLE(i2c, mcp4725_id);
	522
8414af1e JMC	523	#ifdef CONFIG_OF
	524	static const struct of_device_id mcp4725_of_match[] = {
	525	{
	526	.compatible = "microchip,mcp4725",
	527	.data = (void *)MCP4725
	528	},
	529	{
	530	.compatible = "microchip,mcp4726",
	531	.data = (void *)MCP4726
	532	},
	533	{ }
	534	};
	535	MODULE_DEVICE_TABLE(of, mcp4725_of_match);
	536	#endif
	537
cf35ad61 PM	538	static struct i2c_driver mcp4725_driver = {
	539	.driver = {
	540	.name = MCP4725_DRV_NAME,
8414af1e	541	.of_match_table = of_match_ptr(mcp4725_of_match),
1a5bc41a	542	.pm = &mcp4725_pm_ops,
cf35ad61 PM	543	},
cf35ad61 PM	544	.probe = mcp4725_probe,
fc52692c	545	.remove = mcp4725_remove,
cf35ad61 PM	546	.id_table = mcp4725_id,
	547	};
	548	module_i2c_driver(mcp4725_driver);
	549
	550	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
35f73967	551	MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");
cf35ad61	552	MODULE_LICENSE("GPL");