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

/*
 * mcp4725.c - Support for Microchip MCP4725
 *
 * 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/init.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 iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct mcp4725_data *data = iio_priv(indio_dev);
	u8 outbuf[2];

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

	return i2c_master_send(to_i2c_client(dev), outbuf, 2);
}

static int mcp4725_resume(struct device *dev)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct mcp4725_data *data = iio_priv(indio_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(to_i2c_client(dev), 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 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;
}

static const struct iio_enum mcp4725_powerdown_mode_enum = {
	.items = mcp4725_powerdown_modes,
	.num_items = ARRAY_SIZE(mcp4725_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,
	},
	IIO_ENUM("powerdown_mode", false, &mcp4725_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &mcp4725_powerdown_mode_enum),
	{ },
};

static const struct iio_chan_spec mcp4725_channel = {
	.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),
	.scan_type	= IIO_ST('u', 12, 16, 0),
	.ext_info	= mcp4725_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);
	unsigned long scale_uv;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		*val = data->dac_value;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		scale_uv = (data->vref_mv * 1000) >> 12;
		*val =  scale_uv / 1000000;
		*val2 = scale_uv % 1000000;
		return IIO_VAL_INT_PLUS_MICRO;
	}
	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->info = &mcp4725_info;
	indio_dev->channels = &mcp4725_channel;
	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; /* 500kohm_to_gnd */
	data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);

	err = iio_device_register(indio_dev);
	if (err)
		return err;

	dev_info(&client->dev, "MCP4725 DAC registered\n");

	return 0;
}

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", 0 },
	{ }
};
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 12-bit DAC");
MODULE_LICENSE("GPL");
Commit	Line	Data
cf35ad61 PM	1	/*
	2	* mcp4725.c - Support for Microchip MCP4725
	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>
	18	#include <linux/init.h>
	19	#include <linux/i2c.h>
	20	#include <linux/err.h>
f17b77d6	21	#include <linux/delay.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;
	32	u16 vref_mv;
	33	u16 dac_value;
155f1b41 PM	34	bool powerdown;
155f1b41 PM	35	unsigned powerdown_mode;
cf35ad61 PM	36	};
cf35ad61 PM	37
cf35ad61 PM	38	static int mcp4725_suspend(struct device *dev)
cf35ad61 PM	39	{
155f1b41 PM	40	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
155f1b41 PM	41	struct mcp4725_data *data = iio_priv(indio_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 PM	47
	48	return i2c_master_send(to_i2c_client(dev), outbuf, 2);
	49	}
	50
	51	static int mcp4725_resume(struct device *dev)
	52	{
	53	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	54	struct mcp4725_data *data = iio_priv(indio_dev);
	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 PM	61
	62	return i2c_master_send(to_i2c_client(dev), outbuf, 2);
	63	}
	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
	138	static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev,
	139	const struct iio_chan_spec *chan)
	140	{
	141	struct mcp4725_data *data = iio_priv(indio_dev);
	142
	143	return data->powerdown_mode;
	144	}
	145
	146	static int mcp4725_set_powerdown_mode(struct iio_dev *indio_dev,
	147	const struct iio_chan_spec *chan, unsigned mode)
	148	{
	149	struct mcp4725_data *data = iio_priv(indio_dev);
	150
	151	data->powerdown_mode = mode;
	152
	153	return 0;
	154	}
	155
	156	static ssize_t mcp4725_read_powerdown(struct iio_dev *indio_dev,
	157	uintptr_t private, const struct iio_chan_spec chan, char buf)
	158	{
	159	struct mcp4725_data *data = iio_priv(indio_dev);
	160
	161	return sprintf(buf, "%d\n", data->powerdown);
	162	}
	163
	164	static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev,
	165	uintptr_t private, const struct iio_chan_spec *chan,
	166	const char *buf, size_t len)
	167	{
	168	struct mcp4725_data *data = iio_priv(indio_dev);
	169	bool state;
	170	int ret;
	171
	172	ret = strtobool(buf, &state);
	173	if (ret)
	174	return ret;
	175
	176	if (state)
	177	ret = mcp4725_suspend(&data->client->dev);
	178	else
	179	ret = mcp4725_resume(&data->client->dev);
	180	if (ret < 0)
	181	return ret;
	182
	183	return len;
	184	}
	185
	186	static const struct iio_enum mcp4725_powerdown_mode_enum = {
	187	.items = mcp4725_powerdown_modes,
	188	.num_items = ARRAY_SIZE(mcp4725_powerdown_modes),
	189	.get = mcp4725_get_powerdown_mode,
	190	.set = mcp4725_set_powerdown_mode,
	191	};
	192
	193	static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = {
	194	{
	195	.name = "powerdown",
196	.read = mcp4725_read_powerdown,
197	.write = mcp4725_write_powerdown,
198	},
199	IIO_ENUM("powerdown_mode", false, &mcp4725_powerdown_mode_enum),
200	IIO_ENUM_AVAILABLE("powerdown_mode", &mcp4725_powerdown_mode_enum),
201	{ },
202	};
203
cf35ad61 PM	204	static const struct iio_chan_spec mcp4725_channel = {
	205	.type = IIO_VOLTAGE,
	206	.indexed = 1,
	207	.output = 1,
	208	.channel = 0,
90b46374 JC	209	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
90b46374 JC	210	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
cf35ad61	211	.scan_type = IIO_ST('u', 12, 16, 0),
155f1b41	212	.ext_info = mcp4725_ext_info,
cf35ad61 PM	213	};
	214
	215	static int mcp4725_set_value(struct iio_dev *indio_dev, int val)
	216	{
	217	struct mcp4725_data *data = iio_priv(indio_dev);
	218	u8 outbuf[2];
	219	int ret;
	220
	221	if (val >= (1 << 12) \|\| val < 0)
	222	return -EINVAL;
	223
	224	outbuf[0] = (val >> 8) & 0xf;
	225	outbuf[1] = val & 0xff;
	226
	227	ret = i2c_master_send(data->client, outbuf, 2);
	228	if (ret < 0)
	229	return ret;
	230	else if (ret != 2)
	231	return -EIO;
	232	else
	233	return 0;
	234	}
	235
	236	static int mcp4725_read_raw(struct iio_dev *indio_dev,
	237	struct iio_chan_spec const *chan,
	238	int val, int val2, long mask)
	239	{
	240	struct mcp4725_data *data = iio_priv(indio_dev);
	241	unsigned long scale_uv;
	242
	243	switch (mask) {
	244	case IIO_CHAN_INFO_RAW:
	245	*val = data->dac_value;
	246	return IIO_VAL_INT;
	247	case IIO_CHAN_INFO_SCALE:
	248	scale_uv = (data->vref_mv * 1000) >> 12;
	249	*val = scale_uv / 1000000;
	250	*val2 = scale_uv % 1000000;
	251	return IIO_VAL_INT_PLUS_MICRO;
	252	}
	253	return -EINVAL;
	254	}
	255
	256	static int mcp4725_write_raw(struct iio_dev *indio_dev,
	257	struct iio_chan_spec const *chan,
	258	int val, int val2, long mask)
	259	{
	260	struct mcp4725_data *data = iio_priv(indio_dev);
	261	int ret;
	262
	263	switch (mask) {
	264	case IIO_CHAN_INFO_RAW:
	265	ret = mcp4725_set_value(indio_dev, val);
	266	data->dac_value = val;
	267	break;
	268	default:
	269	ret = -EINVAL;
	270	break;
	271	}
	272
	273	return ret;
	274	}
	275
	276	static const struct iio_info mcp4725_info = {
277	.read_raw = mcp4725_read_raw,
278	.write_raw = mcp4725_write_raw,
f17b77d6	279	.attrs = &mcp4725_attribute_group,
cf35ad61 PM	280	.driver_module = THIS_MODULE,
	281	};
	282
fc52692c GKH	283	static int mcp4725_probe(struct i2c_client *client,
fc52692c GKH	284	const struct i2c_device_id *id)
cf35ad61 PM	285	{
	286	struct mcp4725_data *data;
	287	struct iio_dev *indio_dev;
	288	struct mcp4725_platform_data *platform_data = client->dev.platform_data;
	289	u8 inbuf[3];
155f1b41	290	u8 pd;
cf35ad61 PM	291	int err;
	292
	293	if (!platform_data \|\| !platform_data->vref_mv) {
	294	dev_err(&client->dev, "invalid platform data");
b6ff86f3	295	return -EINVAL;
cf35ad61 PM	296	}
cf35ad61 PM	297
b6ff86f3 PM	298	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	299	if (indio_dev == NULL)
	300	return -ENOMEM;
cf35ad61 PM	301	data = iio_priv(indio_dev);
	302	i2c_set_clientdata(client, indio_dev);
	303	data->client = client;
	304
	305	indio_dev->dev.parent = &client->dev;
	306	indio_dev->info = &mcp4725_info;
	307	indio_dev->channels = &mcp4725_channel;
	308	indio_dev->num_channels = 1;
	309	indio_dev->modes = INDIO_DIRECT_MODE;
	310
	311	data->vref_mv = platform_data->vref_mv;
	312
	313	/* read current DAC value */
	314	err = i2c_master_recv(client, inbuf, 3);
	315	if (err < 0) {
	316	dev_err(&client->dev, "failed to read DAC value");
b6ff86f3	317	return err;
cf35ad61	318	}
155f1b41 PM	319	pd = (inbuf[0] >> 1) & 0x3;
	320	data->powerdown = pd > 0 ? true : false;
	321	data->powerdown_mode = pd ? pd-1 : 2; /* 500kohm_to_gnd */
cf35ad61 PM	322	data->dac_value = (inbuf[1] << 4) \| (inbuf[2] >> 4);
	323
	324	err = iio_device_register(indio_dev);
	325	if (err)
b6ff86f3	326	return err;
cf35ad61 PM	327
	328	dev_info(&client->dev, "MCP4725 DAC registered\n");
	329
	330	return 0;
cf35ad61 PM	331	}
cf35ad61 PM	332
fc52692c	333	static int mcp4725_remove(struct i2c_client *client)
cf35ad61	334	{
b6ff86f3	335	iio_device_unregister(i2c_get_clientdata(client));
cf35ad61 PM	336	return 0;
	337	}
	338
	339	static const struct i2c_device_id mcp4725_id[] = {
	340	{ "mcp4725", 0 },
	341	{ }
	342	};
	343	MODULE_DEVICE_TABLE(i2c, mcp4725_id);
	344
	345	static struct i2c_driver mcp4725_driver = {
	346	.driver = {
	347	.name = MCP4725_DRV_NAME,
	348	.pm = MCP4725_PM_OPS,
	349	},
	350	.probe = mcp4725_probe,
fc52692c	351	.remove = mcp4725_remove,
cf35ad61 PM	352	.id_table = mcp4725_id,
	353	};
	354	module_i2c_driver(mcp4725_driver);
	355
	356	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	357	MODULE_DESCRIPTION("MCP4725 12-bit DAC");
	358	MODULE_LICENSE("GPL");