[mirror_ubuntu-artful-kernel.git] / drivers / iio / dac / ad5446.c

/*
 * AD5446 SPI DAC driver
 *
 * Copyright 2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/module.h>

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

#define MODE_PWRDWN_1k		0x1
#define MODE_PWRDWN_100k	0x2
#define MODE_PWRDWN_TRISTATE	0x3

/**
 * struct ad5446_state - driver instance specific data
 * @spi:		spi_device
 * @chip_info:		chip model specific constants, available modes etc
 * @reg:		supply regulator
 * @vref_mv:		actual reference voltage used
 */

struct ad5446_state {
	struct device		*dev;
	const struct ad5446_chip_info	*chip_info;
	struct regulator		*reg;
	unsigned short			vref_mv;
	unsigned			cached_val;
	unsigned			pwr_down_mode;
	unsigned			pwr_down;
};

/**
 * struct ad5446_chip_info - chip specific information
 * @channel:		channel spec for the DAC
 * @int_vref_mv:	AD5620/40/60: the internal reference voltage
 * @write:		chip specific helper function to write to the register
 */

struct ad5446_chip_info {
	struct iio_chan_spec	channel;
	u16			int_vref_mv;
	int			(*write)(struct ad5446_state *st, unsigned val);
};

static const char * const ad5446_powerdown_modes[] = {
	"1kohm_to_gnd", "100kohm_to_gnd", "three_state"
};

static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	st->pwr_down_mode = mode + 1;

	return 0;
}

static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	return st->pwr_down_mode - 1;
}

static const struct iio_enum ad5446_powerdown_mode_enum = {
	.items = ad5446_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5446_powerdown_modes),
	.get = ad5446_get_powerdown_mode,
	.set = ad5446_set_powerdown_mode,
};

static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
					   uintptr_t private,
					   const struct iio_chan_spec *chan,
					   char *buf)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", st->pwr_down);
}

static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
					    uintptr_t private,
					    const struct iio_chan_spec *chan,
					    const char *buf, size_t len)
{
	struct ad5446_state *st = iio_priv(indio_dev);
	unsigned int shift;
	unsigned int val;
	bool powerdown;
	int ret;

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

	mutex_lock(&indio_dev->mlock);
	st->pwr_down = powerdown;

	if (st->pwr_down) {
		shift = chan->scan_type.realbits + chan->scan_type.shift;
		val = st->pwr_down_mode << shift;
	} else {
		val = st->cached_val;
	}

	ret = st->chip_info->write(st, val);
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
}

static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = {
	{
		.name = "powerdown",
		.read = ad5446_read_dac_powerdown,
		.write = ad5446_write_dac_powerdown,
	},
	IIO_ENUM("powerdown_mode", false, &ad5446_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
	{ },
};

#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
	.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', (bits), (storage), (shift)), \
	.ext_info = (ext), \
}

#define AD5446_CHANNEL(bits, storage, shift) \
	_AD5446_CHANNEL(bits, storage, shift, NULL)

#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)

static int ad5446_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5446_state *st = iio_priv(indio_dev);
	unsigned long scale_uv;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		*val = st->cached_val;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
		*val =  scale_uv / 1000;
		*val2 = (scale_uv % 1000) * 1000;
		return IIO_VAL_INT_PLUS_MICRO;

	}
	return -EINVAL;
}

static int ad5446_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct ad5446_state *st = iio_priv(indio_dev);
	int ret = 0;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (val >= (1 << chan->scan_type.realbits) || val < 0)
			return -EINVAL;

		val <<= chan->scan_type.shift;
		mutex_lock(&indio_dev->mlock);
		st->cached_val = val;
		if (!st->pwr_down)
			ret = st->chip_info->write(st, val);
		mutex_unlock(&indio_dev->mlock);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static const struct iio_info ad5446_info = {
	.read_raw = ad5446_read_raw,
	.write_raw = ad5446_write_raw,
	.driver_module = THIS_MODULE,
};

static int ad5446_probe(struct device *dev, const char *name,
			const struct ad5446_chip_info *chip_info)
{
	struct ad5446_state *st;
	struct iio_dev *indio_dev;
	struct regulator *reg;
	int ret, voltage_uv = 0;

	reg = devm_regulator_get(dev, "vcc");
	if (!IS_ERR(reg)) {
		ret = regulator_enable(reg);
		if (ret)
			return ret;

		ret = regulator_get_voltage(reg);
		if (ret < 0)
			goto error_disable_reg;

		voltage_uv = ret;
	}

	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_disable_reg;
	}
	st = iio_priv(indio_dev);
	st->chip_info = chip_info;

	dev_set_drvdata(dev, indio_dev);
	st->reg = reg;
	st->dev = dev;

	/* Establish that the iio_dev is a child of the device */
	indio_dev->dev.parent = dev;
	indio_dev->name = name;
	indio_dev->info = &ad5446_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = &st->chip_info->channel;
	indio_dev->num_channels = 1;

	st->pwr_down_mode = MODE_PWRDWN_1k;

	if (st->chip_info->int_vref_mv)
		st->vref_mv = st->chip_info->int_vref_mv;
	else if (voltage_uv)
		st->vref_mv = voltage_uv / 1000;
	else
		dev_warn(dev, "reference voltage unspecified\n");

	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_disable_reg;

	return 0;

error_disable_reg:
	if (!IS_ERR(reg))
		regulator_disable(reg);
	return ret;
}

static int ad5446_remove(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!IS_ERR(st->reg))
		regulator_disable(st->reg);

	return 0;
}

#if IS_ENABLED(CONFIG_SPI_MASTER)

static int ad5446_write(struct ad5446_state *st, unsigned val)
{
	struct spi_device *spi = to_spi_device(st->dev);
	__be16 data = cpu_to_be16(val);

	return spi_write(spi, &data, sizeof(data));
}

static int ad5660_write(struct ad5446_state *st, unsigned val)
{
	struct spi_device *spi = to_spi_device(st->dev);
	uint8_t data[3];

	data[0] = (val >> 16) & 0xFF;
	data[1] = (val >> 8) & 0xFF;
	data[2] = val & 0xFF;

	return spi_write(spi, data, sizeof(data));
}

/**
 * ad5446_supported_spi_device_ids:
 * The AD5620/40/60 parts are available in different fixed internal reference
 * voltage options. The actual part numbers may look differently
 * (and a bit cryptic), however this style is used to make clear which
 * parts are supported here.
 */
enum ad5446_supported_spi_device_ids {
	ID_AD5300,
	ID_AD5310,
	ID_AD5320,
	ID_AD5444,
	ID_AD5446,
	ID_AD5450,
	ID_AD5451,
	ID_AD5541A,
	ID_AD5512A,
	ID_AD5553,
	ID_AD5601,
	ID_AD5611,
	ID_AD5621,
	ID_AD5620_2500,
	ID_AD5620_1250,
	ID_AD5640_2500,
	ID_AD5640_1250,
	ID_AD5660_2500,
	ID_AD5660_1250,
	ID_AD5662,
};

static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
	[ID_AD5300] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
		.write = ad5446_write,
	},
	[ID_AD5310] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
		.write = ad5446_write,
	},
	[ID_AD5320] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
		.write = ad5446_write,
	},
	[ID_AD5444] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.write = ad5446_write,
	},
	[ID_AD5446] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.write = ad5446_write,
	},
	[ID_AD5450] = {
		.channel = AD5446_CHANNEL(8, 16, 6),
		.write = ad5446_write,
	},
	[ID_AD5451] = {
		.channel = AD5446_CHANNEL(10, 16, 4),
		.write = ad5446_write,
	},
	[ID_AD5541A] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.write = ad5446_write,
	},
	[ID_AD5512A] = {
		.channel = AD5446_CHANNEL(12, 16, 4),
		.write = ad5446_write,
	},
	[ID_AD5553] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.write = ad5446_write,
	},
	[ID_AD5601] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
		.write = ad5446_write,
	},
	[ID_AD5611] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
		.write = ad5446_write,
	},
	[ID_AD5621] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.write = ad5446_write,
	},
	[ID_AD5620_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.int_vref_mv = 2500,
		.write = ad5446_write,
	},
	[ID_AD5620_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.int_vref_mv = 1250,
		.write = ad5446_write,
	},
	[ID_AD5640_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.int_vref_mv = 2500,
		.write = ad5446_write,
	},
	[ID_AD5640_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.int_vref_mv = 1250,
		.write = ad5446_write,
	},
	[ID_AD5660_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.int_vref_mv = 2500,
		.write = ad5660_write,
	},
	[ID_AD5660_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.int_vref_mv = 1250,
		.write = ad5660_write,
	},
	[ID_AD5662] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.write = ad5660_write,
	},
};

static const struct spi_device_id ad5446_spi_ids[] = {
	{"ad5300", ID_AD5300},
	{"ad5310", ID_AD5310},
	{"ad5320", ID_AD5320},
	{"ad5444", ID_AD5444},
	{"ad5446", ID_AD5446},
	{"ad5450", ID_AD5450},
	{"ad5451", ID_AD5451},
	{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
	{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
	{"ad5512a", ID_AD5512A},
	{"ad5541a", ID_AD5541A},
	{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
	{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
	{"ad5553", ID_AD5553},
	{"ad5601", ID_AD5601},
	{"ad5611", ID_AD5611},
	{"ad5621", ID_AD5621},
	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	{"ad5640-2500", ID_AD5640_2500},
	{"ad5640-1250", ID_AD5640_1250},
	{"ad5660-2500", ID_AD5660_2500},
	{"ad5660-1250", ID_AD5660_1250},
	{"ad5662", ID_AD5662},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);

static int ad5446_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);

	return ad5446_probe(&spi->dev, id->name,
		&ad5446_spi_chip_info[id->driver_data]);
}

static int ad5446_spi_remove(struct spi_device *spi)
{
	return ad5446_remove(&spi->dev);
}

static struct spi_driver ad5446_spi_driver = {
	.driver = {
		.name	= "ad5446",
		.owner	= THIS_MODULE,
	},
	.probe		= ad5446_spi_probe,
	.remove		= ad5446_spi_remove,
	.id_table	= ad5446_spi_ids,
};

static int __init ad5446_spi_register_driver(void)
{
	return spi_register_driver(&ad5446_spi_driver);
}

static void ad5446_spi_unregister_driver(void)
{
	spi_unregister_driver(&ad5446_spi_driver);
}

#else

static inline int ad5446_spi_register_driver(void) { return 0; }
static inline void ad5446_spi_unregister_driver(void) { }

#endif

#if IS_ENABLED(CONFIG_I2C)

static int ad5622_write(struct ad5446_state *st, unsigned val)
{
	struct i2c_client *client = to_i2c_client(st->dev);
	__be16 data = cpu_to_be16(val);

	return i2c_master_send(client, (char *)&data, sizeof(data));
}

/**
 * ad5446_supported_i2c_device_ids:
 * The AD5620/40/60 parts are available in different fixed internal reference
 * voltage options. The actual part numbers may look differently
 * (and a bit cryptic), however this style is used to make clear which
 * parts are supported here.
 */
enum ad5446_supported_i2c_device_ids {
	ID_AD5602,
	ID_AD5612,
	ID_AD5622,
};

static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
	[ID_AD5602] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
		.write = ad5622_write,
	},
	[ID_AD5612] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
		.write = ad5622_write,
	},
	[ID_AD5622] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
		.write = ad5622_write,
	},
};

static int ad5446_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	return ad5446_probe(&i2c->dev, id->name,
		&ad5446_i2c_chip_info[id->driver_data]);
}

static int ad5446_i2c_remove(struct i2c_client *i2c)
{
	return ad5446_remove(&i2c->dev);
}

static const struct i2c_device_id ad5446_i2c_ids[] = {
	{"ad5301", ID_AD5602},
	{"ad5311", ID_AD5612},
	{"ad5321", ID_AD5622},
	{"ad5602", ID_AD5602},
	{"ad5612", ID_AD5612},
	{"ad5622", ID_AD5622},
	{}
};
MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);

static struct i2c_driver ad5446_i2c_driver = {
	.driver = {
		   .name = "ad5446",
		   .owner = THIS_MODULE,
	},
	.probe = ad5446_i2c_probe,
	.remove = ad5446_i2c_remove,
	.id_table = ad5446_i2c_ids,
};

static int __init ad5446_i2c_register_driver(void)
{
	return i2c_add_driver(&ad5446_i2c_driver);
}

static void __exit ad5446_i2c_unregister_driver(void)
{
	i2c_del_driver(&ad5446_i2c_driver);
}

#else

static inline int ad5446_i2c_register_driver(void) { return 0; }
static inline void ad5446_i2c_unregister_driver(void) { }

#endif

static int __init ad5446_init(void)
{
	int ret;

	ret = ad5446_spi_register_driver();
	if (ret)
		return ret;

	ret = ad5446_i2c_register_driver();
	if (ret) {
		ad5446_spi_unregister_driver();
		return ret;
	}

	return 0;
}
module_init(ad5446_init);

static void __exit ad5446_exit(void)
{
	ad5446_i2c_unregister_driver();
	ad5446_spi_unregister_driver();
}
module_exit(ad5446_exit);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
b5a49481 MH	1	/*
	2	* AD5446 SPI DAC driver
	3	*
	4	* Copyright 2010 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
	9	#include <linux/interrupt.h>
	10	#include <linux/workqueue.h>
	11	#include <linux/device.h>
	12	#include <linux/kernel.h>
	13	#include <linux/slab.h>
	14	#include <linux/sysfs.h>
	15	#include <linux/list.h>
	16	#include <linux/spi/spi.h>
3ec36a2c	17	#include <linux/i2c.h>
b5a49481 MH	18	#include <linux/regulator/consumer.h>
b5a49481 MH	19	#include <linux/err.h>
99c97852	20	#include <linux/module.h>
b5a49481	21
06458e27 JC	22	#include <linux/iio/iio.h>
06458e27 JC	23	#include <linux/iio/sysfs.h>
b5a49481	24
2e15c903 JFD	25	#define MODE_PWRDWN_1k 0x1
	26	#define MODE_PWRDWN_100k 0x2
	27	#define MODE_PWRDWN_TRISTATE 0x3
	28
	29	/**
	30	* struct ad5446_state - driver instance specific data
	31	* @spi: spi_device
	32	* @chip_info: chip model specific constants, available modes etc
	33	* @reg: supply regulator
	34	* @vref_mv: actual reference voltage used
	35	*/
	36
	37	struct ad5446_state {
	38	struct device *dev;
	39	const struct ad5446_chip_info *chip_info;
	40	struct regulator *reg;
	41	unsigned short vref_mv;
	42	unsigned cached_val;
	43	unsigned pwr_down_mode;
	44	unsigned pwr_down;
	45	};
	46
	47	/**
	48	* struct ad5446_chip_info - chip specific information
	49	* @channel: channel spec for the DAC
	50	* @int_vref_mv: AD5620/40/60: the internal reference voltage
	51	* @write: chip specific helper function to write to the register
	52	*/
	53
	54	struct ad5446_chip_info {
	55	struct iio_chan_spec channel;
	56	u16 int_vref_mv;
	57	int (write)(struct ad5446_state st, unsigned val);
	58	};
b5a49481	59
83f0f572	60	static const char * const ad5446_powerdown_modes[] = {
09d48aa9	61	"1kohm_to_gnd", "100kohm_to_gnd", "three_state"
83f0f572 LPC	62	};
83f0f572 LPC	63
09d48aa9 LPC	64	static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
09d48aa9 LPC	65	const struct iio_chan_spec *chan, unsigned int mode)
bbed4dc7	66	{
638e59fc	67	struct ad5446_state *st = iio_priv(indio_dev);
83f0f572	68
09d48aa9	69	st->pwr_down_mode = mode + 1;
bbed4dc7	70
09d48aa9	71	return 0;
bbed4dc7 MH	72	}
bbed4dc7 MH	73
09d48aa9 LPC	74	static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
09d48aa9 LPC	75	const struct iio_chan_spec *chan)
bbed4dc7	76	{
638e59fc	77	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7	78
09d48aa9	79	return st->pwr_down_mode - 1;
bbed4dc7 MH	80	}
bbed4dc7 MH	81
09d48aa9 LPC	82	static const struct iio_enum ad5446_powerdown_mode_enum = {
	83	.items = ad5446_powerdown_modes,
	84	.num_items = ARRAY_SIZE(ad5446_powerdown_modes),
	85	.get = ad5446_get_powerdown_mode,
	86	.set = ad5446_set_powerdown_mode,
	87	};
	88
83f0f572	89	static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
fc6d1139	90	uintptr_t private,
83f0f572	91	const struct iio_chan_spec *chan,
bbed4dc7 MH	92	char *buf)
bbed4dc7 MH	93	{
638e59fc	94	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7 MH	95
	96	return sprintf(buf, "%d\n", st->pwr_down);
	97	}
	98
83f0f572	99	static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
fc6d1139	100	uintptr_t private,
83f0f572	101	const struct iio_chan_spec *chan,
bbed4dc7 MH	102	const char *buf, size_t len)
bbed4dc7 MH	103	{
638e59fc	104	struct ad5446_state *st = iio_priv(indio_dev);
cae329e0 LPC	105	unsigned int shift;
cae329e0 LPC	106	unsigned int val;
83f0f572	107	bool powerdown;
bbed4dc7 MH	108	int ret;
bbed4dc7 MH	109
83f0f572	110	ret = strtobool(buf, &powerdown);
bbed4dc7 MH	111	if (ret)
	112	return ret;
	113
638e59fc	114	mutex_lock(&indio_dev->mlock);
83f0f572	115	st->pwr_down = powerdown;
bbed4dc7	116
cae329e0 LPC	117	if (st->pwr_down) {
	118	shift = chan->scan_type.realbits + chan->scan_type.shift;
	119	val = st->pwr_down_mode << shift;
	120	} else {
	121	val = st->cached_val;
	122	}
bbed4dc7	123
cae329e0	124	ret = st->chip_info->write(st, val);
638e59fc	125	mutex_unlock(&indio_dev->mlock);
bbed4dc7 MH	126
	127	return ret ? ret : len;
	128	}
	129
3ec36a2c	130	static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = {
83f0f572 LPC	131	{
	132	.name = "powerdown",
	133	.read = ad5446_read_dac_powerdown,
	134	.write = ad5446_write_dac_powerdown,
83f0f572	135	},
09d48aa9 LPC	136	IIO_ENUM("powerdown_mode", false, &ad5446_powerdown_mode_enum),
09d48aa9 LPC	137	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
83f0f572	138	{ },
b5a49481 MH	139	};
b5a49481 MH	140
83f0f572	141	#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
33ad6b21 LPC	142	.type = IIO_VOLTAGE, \
	143	.indexed = 1, \
	144	.output = 1, \
	145	.channel = 0, \
2f6a4a44 JC	146	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
2f6a4a44 JC	147	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
83f0f572 LPC	148	.scan_type = IIO_ST('u', (bits), (storage), (shift)), \
83f0f572 LPC	149	.ext_info = (ext), \
33ad6b21 LPC	150	}
33ad6b21 LPC	151
83f0f572 LPC	152	#define AD5446_CHANNEL(bits, storage, shift) \
	153	_AD5446_CHANNEL(bits, storage, shift, NULL)
	154
	155	#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
3ec36a2c	156	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)
b5a49481	157
33ad6b21 LPC	158	static int ad5446_read_raw(struct iio_dev *indio_dev,
	159	struct iio_chan_spec const *chan,
	160	int *val,
	161	int *val2,
	162	long m)
	163	{
	164	struct ad5446_state *st = iio_priv(indio_dev);
	165	unsigned long scale_uv;
	166
	167	switch (m) {
5e06bdfb LPC	168	case IIO_CHAN_INFO_RAW:
	169	*val = st->cached_val;
	170	return IIO_VAL_INT;
33ad6b21 LPC	171	case IIO_CHAN_INFO_SCALE:
	172	scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
	173	*val = scale_uv / 1000;
	174	val2 = (scale_uv % 1000) 1000;
	175	return IIO_VAL_INT_PLUS_MICRO;
	176
	177	}
	178	return -EINVAL;
	179	}
	180
	181	static int ad5446_write_raw(struct iio_dev *indio_dev,
	182	struct iio_chan_spec const *chan,
	183	int val,
	184	int val2,
	185	long mask)
	186	{
	187	struct ad5446_state *st = iio_priv(indio_dev);
07ffd0d0	188	int ret = 0;
33ad6b21 LPC	189
33ad6b21 LPC	190	switch (mask) {
09f4eb40	191	case IIO_CHAN_INFO_RAW:
33ad6b21 LPC	192	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
	193	return -EINVAL;
	194
	195	val <<= chan->scan_type.shift;
	196	mutex_lock(&indio_dev->mlock);
	197	st->cached_val = val;
af836d9a	198	if (!st->pwr_down)
cae329e0	199	ret = st->chip_info->write(st, val);
33ad6b21 LPC	200	mutex_unlock(&indio_dev->mlock);
	201	break;
	202	default:
	203	ret = -EINVAL;
	204	}
	205
	206	return ret;
	207	}
	208
6fe8135f	209	static const struct iio_info ad5446_info = {
7389266c JC	210	.read_raw = ad5446_read_raw,
	211	.write_raw = ad5446_write_raw,
	212	.driver_module = THIS_MODULE,
	213	};
	214
fc52692c GKH	215	static int ad5446_probe(struct device dev, const char name,
fc52692c GKH	216	const struct ad5446_chip_info *chip_info)
b5a49481 MH	217	{
b5a49481 MH	218	struct ad5446_state *st;
86729fc4 JC	219	struct iio_dev *indio_dev;
86729fc4 JC	220	struct regulator *reg;
b5a49481 MH	221	int ret, voltage_uv = 0;
b5a49481 MH	222
ba727295	223	reg = devm_regulator_get(dev, "vcc");
86729fc4 JC	224	if (!IS_ERR(reg)) {
86729fc4 JC	225	ret = regulator_enable(reg);
b5a49481	226	if (ret)
ba727295	227	return ret;
b5a49481	228
13e57ee2 AL	229	ret = regulator_get_voltage(reg);
	230	if (ret < 0)
	231	goto error_disable_reg;
	232
	233	voltage_uv = ret;
b5a49481 MH	234	}
b5a49481 MH	235
ba727295	236	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
86729fc4 JC	237	if (indio_dev == NULL) {
	238	ret = -ENOMEM;
	239	goto error_disable_reg;
	240	}
	241	st = iio_priv(indio_dev);
3ec36a2c	242	st->chip_info = chip_info;
b5a49481	243
3ec36a2c	244	dev_set_drvdata(dev, indio_dev);
86729fc4	245	st->reg = reg;
3ec36a2c	246	st->dev = dev;
b5a49481	247
3ec36a2c JFD	248	/* Establish that the iio_dev is a child of the device */
	249	indio_dev->dev.parent = dev;
	250	indio_dev->name = name;
83f0f572	251	indio_dev->info = &ad5446_info;
86729fc4	252	indio_dev->modes = INDIO_DIRECT_MODE;
33ad6b21 LPC	253	indio_dev->channels = &st->chip_info->channel;
33ad6b21 LPC	254	indio_dev->num_channels = 1;
b5a49481	255
09d48aa9 LPC	256	st->pwr_down_mode = MODE_PWRDWN_1k;
09d48aa9 LPC	257
4e5d3f92	258	if (st->chip_info->int_vref_mv)
bbed4dc7	259	st->vref_mv = st->chip_info->int_vref_mv;
4e5d3f92 LPC	260	else if (voltage_uv)
	261	st->vref_mv = voltage_uv / 1000;
	262	else
3ec36a2c	263	dev_warn(dev, "reference voltage unspecified\n");
b5a49481	264
86729fc4	265	ret = iio_device_register(indio_dev);
b5a49481	266	if (ret)
ba727295	267	goto error_disable_reg;
b5a49481 MH	268
	269	return 0;
	270
b5a49481	271	error_disable_reg:
86729fc4 JC	272	if (!IS_ERR(reg))
86729fc4 JC	273	regulator_disable(reg);
b5a49481 MH	274	return ret;
	275	}
	276
3ec36a2c	277	static int ad5446_remove(struct device *dev)
b5a49481	278	{
3ec36a2c	279	struct iio_dev *indio_dev = dev_get_drvdata(dev);
86729fc4	280	struct ad5446_state *st = iio_priv(indio_dev);
b5a49481 MH	281
b5a49481 MH	282	iio_device_unregister(indio_dev);
ba727295	283	if (!IS_ERR(st->reg))
d2fffd6c	284	regulator_disable(st->reg);
d2fffd6c	285
b5a49481 MH	286	return 0;
	287	}
	288
3ec36a2c JFD	289	#if IS_ENABLED(CONFIG_SPI_MASTER)
	290
	291	static int ad5446_write(struct ad5446_state *st, unsigned val)
	292	{
	293	struct spi_device *spi = to_spi_device(st->dev);
	294	__be16 data = cpu_to_be16(val);
	295
	296	return spi_write(spi, &data, sizeof(data));
	297	}
	298
	299	static int ad5660_write(struct ad5446_state *st, unsigned val)
	300	{
	301	struct spi_device *spi = to_spi_device(st->dev);
	302	uint8_t data[3];
	303
	304	data[0] = (val >> 16) & 0xFF;
	305	data[1] = (val >> 8) & 0xFF;
	306	data[2] = val & 0xFF;
	307
	308	return spi_write(spi, data, sizeof(data));
	309	}
	310
	311	/**
	312	* ad5446_supported_spi_device_ids:
	313	* The AD5620/40/60 parts are available in different fixed internal reference
	314	* voltage options. The actual part numbers may look differently
	315	* (and a bit cryptic), however this style is used to make clear which
	316	* parts are supported here.
	317	*/
	318	enum ad5446_supported_spi_device_ids {
2fafbce2 LPC	319	ID_AD5300,
	320	ID_AD5310,
	321	ID_AD5320,
3ec36a2c JFD	322	ID_AD5444,
	323	ID_AD5446,
	324	ID_AD5450,
	325	ID_AD5451,
	326	ID_AD5541A,
	327	ID_AD5512A,
	328	ID_AD5553,
	329	ID_AD5601,
	330	ID_AD5611,
	331	ID_AD5621,
	332	ID_AD5620_2500,
	333	ID_AD5620_1250,
	334	ID_AD5640_2500,
	335	ID_AD5640_1250,
	336	ID_AD5660_2500,
	337	ID_AD5660_1250,
	338	ID_AD5662,
	339	};
	340
	341	static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
2fafbce2 LPC	342	[ID_AD5300] = {
	343	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	344	.write = ad5446_write,
	345	},
	346	[ID_AD5310] = {
	347	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	348	.write = ad5446_write,
	349	},
	350	[ID_AD5320] = {
	351	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	352	.write = ad5446_write,
	353	},
3ec36a2c JFD	354	[ID_AD5444] = {
	355	.channel = AD5446_CHANNEL(12, 16, 2),
	356	.write = ad5446_write,
	357	},
	358	[ID_AD5446] = {
	359	.channel = AD5446_CHANNEL(14, 16, 0),
	360	.write = ad5446_write,
	361	},
	362	[ID_AD5450] = {
	363	.channel = AD5446_CHANNEL(8, 16, 6),
	364	.write = ad5446_write,
	365	},
	366	[ID_AD5451] = {
	367	.channel = AD5446_CHANNEL(10, 16, 4),
	368	.write = ad5446_write,
	369	},
	370	[ID_AD5541A] = {
	371	.channel = AD5446_CHANNEL(16, 16, 0),
	372	.write = ad5446_write,
	373	},
	374	[ID_AD5512A] = {
	375	.channel = AD5446_CHANNEL(12, 16, 4),
	376	.write = ad5446_write,
	377	},
	378	[ID_AD5553] = {
	379	.channel = AD5446_CHANNEL(14, 16, 0),
	380	.write = ad5446_write,
	381	},
	382	[ID_AD5601] = {
	383	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
	384	.write = ad5446_write,
	385	},
	386	[ID_AD5611] = {
	387	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
	388	.write = ad5446_write,
	389	},
	390	[ID_AD5621] = {
	391	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	392	.write = ad5446_write,
	393	},
	394	[ID_AD5620_2500] = {
	395	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	396	.int_vref_mv = 2500,
	397	.write = ad5446_write,
	398	},
	399	[ID_AD5620_1250] = {
	400	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	401	.int_vref_mv = 1250,
	402	.write = ad5446_write,
	403	},
	404	[ID_AD5640_2500] = {
	405	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	406	.int_vref_mv = 2500,
	407	.write = ad5446_write,
	408	},
	409	[ID_AD5640_1250] = {
	410	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	411	.int_vref_mv = 1250,
	412	.write = ad5446_write,
	413	},
	414	[ID_AD5660_2500] = {
	415	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
	416	.int_vref_mv = 2500,
	417	.write = ad5660_write,
418	},
419	[ID_AD5660_1250] = {
420	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
421	.int_vref_mv = 1250,
422	.write = ad5660_write,
423	},
424	[ID_AD5662] = {
425	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
426	.write = ad5660_write,
427	},
428	};
429
430	static const struct spi_device_id ad5446_spi_ids[] = {
2fafbce2 LPC	431	{"ad5300", ID_AD5300},
	432	{"ad5310", ID_AD5310},
	433	{"ad5320", ID_AD5320},
b5a49481 MH	434	{"ad5444", ID_AD5444},
b5a49481 MH	435	{"ad5446", ID_AD5446},
779c0c46 LPC	436	{"ad5450", ID_AD5450},
	437	{"ad5451", ID_AD5451},
	438	{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
	439	{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
b5a49481	440	{"ad5512a", ID_AD5512A},
67d1c1f4	441	{"ad5541a", ID_AD5541A},
11a7df48 LPC	442	{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
11a7df48 LPC	443	{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
bd51c0b0	444	{"ad5553", ID_AD5553},
2b61535a MH	445	{"ad5601", ID_AD5601},
	446	{"ad5611", ID_AD5611},
	447	{"ad5621", ID_AD5621},
d846263d MH	448	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	449	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	450	{"ad5640-2500", ID_AD5640_2500},
	451	{"ad5640-1250", ID_AD5640_1250},
	452	{"ad5660-2500", ID_AD5660_2500},
	453	{"ad5660-1250", ID_AD5660_1250},
18e5ab31	454	{"ad5662", ID_AD5662},
b5a49481 MH	455	{}
b5a49481 MH	456	};
3ec36a2c JFD	457	MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);
3ec36a2c JFD	458
fc52692c	459	static int ad5446_spi_probe(struct spi_device *spi)
3ec36a2c JFD	460	{
	461	const struct spi_device_id *id = spi_get_device_id(spi);
	462
	463	return ad5446_probe(&spi->dev, id->name,
	464	&ad5446_spi_chip_info[id->driver_data]);
	465	}
b5a49481	466
fc52692c	467	static int ad5446_spi_remove(struct spi_device *spi)
3ec36a2c JFD	468	{
	469	return ad5446_remove(&spi->dev);
	470	}
	471
	472	static struct spi_driver ad5446_spi_driver = {
b5a49481 MH	473	.driver = {
b5a49481 MH	474	.name = "ad5446",
b5a49481 MH	475	.owner = THIS_MODULE,
b5a49481 MH	476	},
3ec36a2c	477	.probe = ad5446_spi_probe,
fc52692c	478	.remove = ad5446_spi_remove,
3ec36a2c JFD	479	.id_table = ad5446_spi_ids,
	480	};
	481
	482	static int __init ad5446_spi_register_driver(void)
	483	{
	484	return spi_register_driver(&ad5446_spi_driver);
	485	}
	486
	487	static void ad5446_spi_unregister_driver(void)
	488	{
	489	spi_unregister_driver(&ad5446_spi_driver);
	490	}
	491
	492	#else
	493
	494	static inline int ad5446_spi_register_driver(void) { return 0; }
	495	static inline void ad5446_spi_unregister_driver(void) { }
	496
	497	#endif
	498
	499	#if IS_ENABLED(CONFIG_I2C)
	500
	501	static int ad5622_write(struct ad5446_state *st, unsigned val)
	502	{
	503	struct i2c_client *client = to_i2c_client(st->dev);
	504	__be16 data = cpu_to_be16(val);
	505
	506	return i2c_master_send(client, (char *)&data, sizeof(data));
	507	}
	508
	509	/**
	510	* ad5446_supported_i2c_device_ids:
	511	* The AD5620/40/60 parts are available in different fixed internal reference
	512	* voltage options. The actual part numbers may look differently
	513	* (and a bit cryptic), however this style is used to make clear which
	514	* parts are supported here.
	515	*/
	516	enum ad5446_supported_i2c_device_ids {
	517	ID_AD5602,
	518	ID_AD5612,
	519	ID_AD5622,
	520	};
	521
	522	static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
	523	[ID_AD5602] = {
	524	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	525	.write = ad5622_write,
	526	},
	527	[ID_AD5612] = {
	528	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	529	.write = ad5622_write,
	530	},
	531	[ID_AD5622] = {
	532	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	533	.write = ad5622_write,
	534	},
b5a49481	535	};
3ec36a2c	536
fc52692c GKH	537	static int ad5446_i2c_probe(struct i2c_client *i2c,
fc52692c GKH	538	const struct i2c_device_id *id)
3ec36a2c JFD	539	{
	540	return ad5446_probe(&i2c->dev, id->name,
	541	&ad5446_i2c_chip_info[id->driver_data]);
	542	}
	543
fc52692c	544	static int ad5446_i2c_remove(struct i2c_client *i2c)
3ec36a2c JFD	545	{
	546	return ad5446_remove(&i2c->dev);
	547	}
	548
	549	static const struct i2c_device_id ad5446_i2c_ids[] = {
bf832380 LPC	550	{"ad5301", ID_AD5602},
	551	{"ad5311", ID_AD5612},
	552	{"ad5321", ID_AD5622},
3ec36a2c JFD	553	{"ad5602", ID_AD5602},
	554	{"ad5612", ID_AD5612},
	555	{"ad5622", ID_AD5622},
	556	{}
	557	};
	558	MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
	559
	560	static struct i2c_driver ad5446_i2c_driver = {
	561	.driver = {
	562	.name = "ad5446",
	563	.owner = THIS_MODULE,
	564	},
	565	.probe = ad5446_i2c_probe,
fc52692c	566	.remove = ad5446_i2c_remove,
3ec36a2c JFD	567	.id_table = ad5446_i2c_ids,
	568	};
	569
	570	static int __init ad5446_i2c_register_driver(void)
	571	{
	572	return i2c_add_driver(&ad5446_i2c_driver);
	573	}
	574
	575	static void __exit ad5446_i2c_unregister_driver(void)
	576	{
	577	i2c_del_driver(&ad5446_i2c_driver);
	578	}
	579
	580	#else
	581
	582	static inline int ad5446_i2c_register_driver(void) { return 0; }
	583	static inline void ad5446_i2c_unregister_driver(void) { }
	584
	585	#endif
	586
	587	static int __init ad5446_init(void)
	588	{
	589	int ret;
	590
	591	ret = ad5446_spi_register_driver();
	592	if (ret)
	593	return ret;
	594
	595	ret = ad5446_i2c_register_driver();
	596	if (ret) {
	597	ad5446_spi_unregister_driver();
	598	return ret;
	599	}
	600
	601	return 0;
	602	}
	603	module_init(ad5446_init);
	604
	605	static void __exit ad5446_exit(void)
	606	{
	607	ad5446_i2c_unregister_driver();
	608	ad5446_spi_unregister_driver();
	609	}
	610	module_exit(ad5446_exit);
b5a49481 MH	611
	612	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	613	MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
	614	MODULE_LICENSE("GPL v2");