[linux-2.6-block.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,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &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,
3704432f	135	.shared = IIO_SEPARATE,
83f0f572	136	},
3704432f	137	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5446_powerdown_mode_enum),
09d48aa9	138	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
83f0f572	139	{ },
b5a49481 MH	140	};
b5a49481 MH	141
83f0f572	142	#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
33ad6b21 LPC	143	.type = IIO_VOLTAGE, \
	144	.indexed = 1, \
	145	.output = 1, \
	146	.channel = 0, \
2f6a4a44 JC	147	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
2f6a4a44 JC	148	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
83f0f572 LPC	149	.scan_type = IIO_ST('u', (bits), (storage), (shift)), \
83f0f572 LPC	150	.ext_info = (ext), \
33ad6b21 LPC	151	}
33ad6b21 LPC	152
83f0f572 LPC	153	#define AD5446_CHANNEL(bits, storage, shift) \
	154	_AD5446_CHANNEL(bits, storage, shift, NULL)
	155
	156	#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
3ec36a2c	157	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)
b5a49481	158
33ad6b21 LPC	159	static int ad5446_read_raw(struct iio_dev *indio_dev,
	160	struct iio_chan_spec const *chan,
	161	int *val,
	162	int *val2,
	163	long m)
	164	{
	165	struct ad5446_state *st = iio_priv(indio_dev);
	166	unsigned long scale_uv;
	167
	168	switch (m) {
5e06bdfb LPC	169	case IIO_CHAN_INFO_RAW:
	170	*val = st->cached_val;
	171	return IIO_VAL_INT;
33ad6b21 LPC	172	case IIO_CHAN_INFO_SCALE:
	173	scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
	174	*val = scale_uv / 1000;
	175	val2 = (scale_uv % 1000) 1000;
	176	return IIO_VAL_INT_PLUS_MICRO;
	177
	178	}
	179	return -EINVAL;
	180	}
	181
	182	static int ad5446_write_raw(struct iio_dev *indio_dev,
	183	struct iio_chan_spec const *chan,
	184	int val,
	185	int val2,
	186	long mask)
	187	{
	188	struct ad5446_state *st = iio_priv(indio_dev);
07ffd0d0	189	int ret = 0;
33ad6b21 LPC	190
33ad6b21 LPC	191	switch (mask) {
09f4eb40	192	case IIO_CHAN_INFO_RAW:
33ad6b21 LPC	193	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
	194	return -EINVAL;
	195
	196	val <<= chan->scan_type.shift;
	197	mutex_lock(&indio_dev->mlock);
	198	st->cached_val = val;
af836d9a	199	if (!st->pwr_down)
cae329e0	200	ret = st->chip_info->write(st, val);
33ad6b21 LPC	201	mutex_unlock(&indio_dev->mlock);
	202	break;
	203	default:
	204	ret = -EINVAL;
	205	}
	206
	207	return ret;
	208	}
	209
6fe8135f	210	static const struct iio_info ad5446_info = {
7389266c JC	211	.read_raw = ad5446_read_raw,
	212	.write_raw = ad5446_write_raw,
	213	.driver_module = THIS_MODULE,
	214	};
	215
fc52692c GKH	216	static int ad5446_probe(struct device dev, const char name,
fc52692c GKH	217	const struct ad5446_chip_info *chip_info)
b5a49481 MH	218	{
b5a49481 MH	219	struct ad5446_state *st;
86729fc4 JC	220	struct iio_dev *indio_dev;
86729fc4 JC	221	struct regulator *reg;
b5a49481 MH	222	int ret, voltage_uv = 0;
b5a49481 MH	223
ba727295	224	reg = devm_regulator_get(dev, "vcc");
86729fc4 JC	225	if (!IS_ERR(reg)) {
86729fc4 JC	226	ret = regulator_enable(reg);
b5a49481	227	if (ret)
ba727295	228	return ret;
b5a49481	229
13e57ee2 AL	230	ret = regulator_get_voltage(reg);
	231	if (ret < 0)
	232	goto error_disable_reg;
	233
	234	voltage_uv = ret;
b5a49481 MH	235	}
b5a49481 MH	236
ba727295	237	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
86729fc4 JC	238	if (indio_dev == NULL) {
	239	ret = -ENOMEM;
	240	goto error_disable_reg;
	241	}
	242	st = iio_priv(indio_dev);
3ec36a2c	243	st->chip_info = chip_info;
b5a49481	244
3ec36a2c	245	dev_set_drvdata(dev, indio_dev);
86729fc4	246	st->reg = reg;
3ec36a2c	247	st->dev = dev;
b5a49481	248
3ec36a2c JFD	249	/* Establish that the iio_dev is a child of the device */
	250	indio_dev->dev.parent = dev;
	251	indio_dev->name = name;
83f0f572	252	indio_dev->info = &ad5446_info;
86729fc4	253	indio_dev->modes = INDIO_DIRECT_MODE;
33ad6b21 LPC	254	indio_dev->channels = &st->chip_info->channel;
33ad6b21 LPC	255	indio_dev->num_channels = 1;
b5a49481	256
09d48aa9 LPC	257	st->pwr_down_mode = MODE_PWRDWN_1k;
09d48aa9 LPC	258
4e5d3f92	259	if (st->chip_info->int_vref_mv)
bbed4dc7	260	st->vref_mv = st->chip_info->int_vref_mv;
4e5d3f92 LPC	261	else if (voltage_uv)
	262	st->vref_mv = voltage_uv / 1000;
	263	else
3ec36a2c	264	dev_warn(dev, "reference voltage unspecified\n");
b5a49481	265
86729fc4	266	ret = iio_device_register(indio_dev);
b5a49481	267	if (ret)
ba727295	268	goto error_disable_reg;
b5a49481 MH	269
	270	return 0;
	271
b5a49481	272	error_disable_reg:
86729fc4 JC	273	if (!IS_ERR(reg))
86729fc4 JC	274	regulator_disable(reg);
b5a49481 MH	275	return ret;
	276	}
	277
3ec36a2c	278	static int ad5446_remove(struct device *dev)
b5a49481	279	{
3ec36a2c	280	struct iio_dev *indio_dev = dev_get_drvdata(dev);
86729fc4	281	struct ad5446_state *st = iio_priv(indio_dev);
b5a49481 MH	282
b5a49481 MH	283	iio_device_unregister(indio_dev);
ba727295	284	if (!IS_ERR(st->reg))
d2fffd6c	285	regulator_disable(st->reg);
d2fffd6c	286
b5a49481 MH	287	return 0;
	288	}
	289
3ec36a2c JFD	290	#if IS_ENABLED(CONFIG_SPI_MASTER)
	291
	292	static int ad5446_write(struct ad5446_state *st, unsigned val)
	293	{
	294	struct spi_device *spi = to_spi_device(st->dev);
	295	__be16 data = cpu_to_be16(val);
	296
	297	return spi_write(spi, &data, sizeof(data));
	298	}
	299
	300	static int ad5660_write(struct ad5446_state *st, unsigned val)
	301	{
	302	struct spi_device *spi = to_spi_device(st->dev);
	303	uint8_t data[3];
	304
	305	data[0] = (val >> 16) & 0xFF;
	306	data[1] = (val >> 8) & 0xFF;
	307	data[2] = val & 0xFF;
	308
	309	return spi_write(spi, data, sizeof(data));
	310	}
	311
	312	/**
	313	* ad5446_supported_spi_device_ids:
	314	* The AD5620/40/60 parts are available in different fixed internal reference
	315	* voltage options. The actual part numbers may look differently
	316	* (and a bit cryptic), however this style is used to make clear which
	317	* parts are supported here.
	318	*/
	319	enum ad5446_supported_spi_device_ids {
2fafbce2 LPC	320	ID_AD5300,
	321	ID_AD5310,
	322	ID_AD5320,
3ec36a2c JFD	323	ID_AD5444,
	324	ID_AD5446,
	325	ID_AD5450,
	326	ID_AD5451,
	327	ID_AD5541A,
	328	ID_AD5512A,
	329	ID_AD5553,
	330	ID_AD5601,
	331	ID_AD5611,
	332	ID_AD5621,
	333	ID_AD5620_2500,
	334	ID_AD5620_1250,
	335	ID_AD5640_2500,
	336	ID_AD5640_1250,
	337	ID_AD5660_2500,
	338	ID_AD5660_1250,
	339	ID_AD5662,
	340	};
	341
	342	static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
2fafbce2 LPC	343	[ID_AD5300] = {
	344	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	345	.write = ad5446_write,
	346	},
	347	[ID_AD5310] = {
	348	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	349	.write = ad5446_write,
	350	},
	351	[ID_AD5320] = {
	352	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	353	.write = ad5446_write,
	354	},
3ec36a2c JFD	355	[ID_AD5444] = {
	356	.channel = AD5446_CHANNEL(12, 16, 2),
	357	.write = ad5446_write,
	358	},
	359	[ID_AD5446] = {
	360	.channel = AD5446_CHANNEL(14, 16, 0),
	361	.write = ad5446_write,
	362	},
	363	[ID_AD5450] = {
	364	.channel = AD5446_CHANNEL(8, 16, 6),
	365	.write = ad5446_write,
	366	},
	367	[ID_AD5451] = {
	368	.channel = AD5446_CHANNEL(10, 16, 4),
	369	.write = ad5446_write,
	370	},
	371	[ID_AD5541A] = {
	372	.channel = AD5446_CHANNEL(16, 16, 0),
	373	.write = ad5446_write,
	374	},
	375	[ID_AD5512A] = {
	376	.channel = AD5446_CHANNEL(12, 16, 4),
	377	.write = ad5446_write,
	378	},
	379	[ID_AD5553] = {
	380	.channel = AD5446_CHANNEL(14, 16, 0),
	381	.write = ad5446_write,
	382	},
	383	[ID_AD5601] = {
	384	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
	385	.write = ad5446_write,
	386	},
	387	[ID_AD5611] = {
	388	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
	389	.write = ad5446_write,
	390	},
	391	[ID_AD5621] = {
	392	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	393	.write = ad5446_write,
	394	},
	395	[ID_AD5620_2500] = {
	396	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	397	.int_vref_mv = 2500,
	398	.write = ad5446_write,
	399	},
	400	[ID_AD5620_1250] = {
	401	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	402	.int_vref_mv = 1250,
	403	.write = ad5446_write,
	404	},
	405	[ID_AD5640_2500] = {
	406	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	407	.int_vref_mv = 2500,
	408	.write = ad5446_write,
	409	},
	410	[ID_AD5640_1250] = {
	411	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	412	.int_vref_mv = 1250,
	413	.write = ad5446_write,
	414	},
	415	[ID_AD5660_2500] = {
	416	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
	417	.int_vref_mv = 2500,
	418	.write = ad5660_write,
419	},
420	[ID_AD5660_1250] = {
421	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
422	.int_vref_mv = 1250,
423	.write = ad5660_write,
424	},
425	[ID_AD5662] = {
426	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
427	.write = ad5660_write,
428	},
429	};
430
431	static const struct spi_device_id ad5446_spi_ids[] = {
2fafbce2 LPC	432	{"ad5300", ID_AD5300},
	433	{"ad5310", ID_AD5310},
	434	{"ad5320", ID_AD5320},
b5a49481 MH	435	{"ad5444", ID_AD5444},
b5a49481 MH	436	{"ad5446", ID_AD5446},
779c0c46 LPC	437	{"ad5450", ID_AD5450},
	438	{"ad5451", ID_AD5451},
	439	{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
	440	{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
b5a49481	441	{"ad5512a", ID_AD5512A},
67d1c1f4	442	{"ad5541a", ID_AD5541A},
11a7df48 LPC	443	{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
11a7df48 LPC	444	{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
bd51c0b0	445	{"ad5553", ID_AD5553},
2b61535a MH	446	{"ad5601", ID_AD5601},
	447	{"ad5611", ID_AD5611},
	448	{"ad5621", ID_AD5621},
d846263d MH	449	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	450	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	451	{"ad5640-2500", ID_AD5640_2500},
	452	{"ad5640-1250", ID_AD5640_1250},
	453	{"ad5660-2500", ID_AD5660_2500},
	454	{"ad5660-1250", ID_AD5660_1250},
18e5ab31	455	{"ad5662", ID_AD5662},
b5a49481 MH	456	{}
b5a49481 MH	457	};
3ec36a2c JFD	458	MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);
3ec36a2c JFD	459
fc52692c	460	static int ad5446_spi_probe(struct spi_device *spi)
3ec36a2c JFD	461	{
	462	const struct spi_device_id *id = spi_get_device_id(spi);
	463
	464	return ad5446_probe(&spi->dev, id->name,
	465	&ad5446_spi_chip_info[id->driver_data]);
	466	}
b5a49481	467
fc52692c	468	static int ad5446_spi_remove(struct spi_device *spi)
3ec36a2c JFD	469	{
	470	return ad5446_remove(&spi->dev);
	471	}
	472
	473	static struct spi_driver ad5446_spi_driver = {
b5a49481 MH	474	.driver = {
b5a49481 MH	475	.name = "ad5446",
b5a49481 MH	476	.owner = THIS_MODULE,
b5a49481 MH	477	},
3ec36a2c	478	.probe = ad5446_spi_probe,
fc52692c	479	.remove = ad5446_spi_remove,
3ec36a2c JFD	480	.id_table = ad5446_spi_ids,
	481	};
	482
	483	static int __init ad5446_spi_register_driver(void)
	484	{
	485	return spi_register_driver(&ad5446_spi_driver);
	486	}
	487
	488	static void ad5446_spi_unregister_driver(void)
	489	{
	490	spi_unregister_driver(&ad5446_spi_driver);
	491	}
	492
	493	#else
	494
	495	static inline int ad5446_spi_register_driver(void) { return 0; }
	496	static inline void ad5446_spi_unregister_driver(void) { }
	497
	498	#endif
	499
	500	#if IS_ENABLED(CONFIG_I2C)
	501
	502	static int ad5622_write(struct ad5446_state *st, unsigned val)
	503	{
	504	struct i2c_client *client = to_i2c_client(st->dev);
	505	__be16 data = cpu_to_be16(val);
	506
	507	return i2c_master_send(client, (char *)&data, sizeof(data));
	508	}
	509
	510	/**
	511	* ad5446_supported_i2c_device_ids:
	512	* The AD5620/40/60 parts are available in different fixed internal reference
	513	* voltage options. The actual part numbers may look differently
	514	* (and a bit cryptic), however this style is used to make clear which
	515	* parts are supported here.
	516	*/
	517	enum ad5446_supported_i2c_device_ids {
	518	ID_AD5602,
	519	ID_AD5612,
	520	ID_AD5622,
	521	};
	522
	523	static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
	524	[ID_AD5602] = {
	525	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	526	.write = ad5622_write,
	527	},
	528	[ID_AD5612] = {
	529	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	530	.write = ad5622_write,
	531	},
	532	[ID_AD5622] = {
	533	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	534	.write = ad5622_write,
	535	},
b5a49481	536	};
3ec36a2c	537
fc52692c GKH	538	static int ad5446_i2c_probe(struct i2c_client *i2c,
fc52692c GKH	539	const struct i2c_device_id *id)
3ec36a2c JFD	540	{
	541	return ad5446_probe(&i2c->dev, id->name,
	542	&ad5446_i2c_chip_info[id->driver_data]);
	543	}
	544
fc52692c	545	static int ad5446_i2c_remove(struct i2c_client *i2c)
3ec36a2c JFD	546	{
	547	return ad5446_remove(&i2c->dev);
	548	}
	549
	550	static const struct i2c_device_id ad5446_i2c_ids[] = {
bf832380 LPC	551	{"ad5301", ID_AD5602},
	552	{"ad5311", ID_AD5612},
	553	{"ad5321", ID_AD5622},
3ec36a2c JFD	554	{"ad5602", ID_AD5602},
	555	{"ad5612", ID_AD5612},
	556	{"ad5622", ID_AD5622},
	557	{}
	558	};
	559	MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
	560
	561	static struct i2c_driver ad5446_i2c_driver = {
	562	.driver = {
	563	.name = "ad5446",
	564	.owner = THIS_MODULE,
	565	},
	566	.probe = ad5446_i2c_probe,
fc52692c	567	.remove = ad5446_i2c_remove,
3ec36a2c JFD	568	.id_table = ad5446_i2c_ids,
	569	};
	570
	571	static int __init ad5446_i2c_register_driver(void)
	572	{
	573	return i2c_add_driver(&ad5446_i2c_driver);
	574	}
	575
	576	static void __exit ad5446_i2c_unregister_driver(void)
	577	{
	578	i2c_del_driver(&ad5446_i2c_driver);
	579	}
	580
	581	#else
	582
	583	static inline int ad5446_i2c_register_driver(void) { return 0; }
	584	static inline void ad5446_i2c_unregister_driver(void) { }
	585
	586	#endif
	587
	588	static int __init ad5446_init(void)
	589	{
	590	int ret;
	591
	592	ret = ad5446_spi_register_driver();
	593	if (ret)
	594	return ret;
	595
	596	ret = ad5446_i2c_register_driver();
	597	if (ret) {
	598	ad5446_spi_unregister_driver();
	599	return ret;
	600	}
	601
	602	return 0;
	603	}
	604	module_init(ad5446_init);
	605
	606	static void __exit ad5446_exit(void)
	607	{
	608	ad5446_i2c_unregister_driver();
	609	ad5446_spi_unregister_driver();
	610	}
	611	module_exit(ad5446_exit);
b5a49481 MH	612
	613	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	614	MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
	615	MODULE_LICENSE("GPL v2");