[deliverable/linux.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 = { \
		.sign = 'u', \
		.realbits = (bits), \
		.storagebits = (storage), \
		.shift = (_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);

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		*val = st->cached_val;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = st->vref_mv;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	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_AD5641,
	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_AD5641] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.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},
	{"ad5641", ID_AD5641},
	{"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",
	},
	.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",
	},
	.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
e3019c21	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), \
e3019c21 JC	149	.scan_type = { \
	150	.sign = 'u', \
	151	.realbits = (bits), \
	152	.storagebits = (storage), \
	153	.shift = (_shift), \
	154	}, \
83f0f572	155	.ext_info = (ext), \
33ad6b21 LPC	156	}
33ad6b21 LPC	157
83f0f572 LPC	158	#define AD5446_CHANNEL(bits, storage, shift) \
	159	_AD5446_CHANNEL(bits, storage, shift, NULL)
	160
	161	#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
3ec36a2c	162	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)
b5a49481	163
33ad6b21 LPC	164	static int ad5446_read_raw(struct iio_dev *indio_dev,
	165	struct iio_chan_spec const *chan,
	166	int *val,
	167	int *val2,
	168	long m)
	169	{
	170	struct ad5446_state *st = iio_priv(indio_dev);
33ad6b21 LPC	171
33ad6b21 LPC	172	switch (m) {
5e06bdfb LPC	173	case IIO_CHAN_INFO_RAW:
	174	*val = st->cached_val;
	175	return IIO_VAL_INT;
33ad6b21	176	case IIO_CHAN_INFO_SCALE:
0a99b601 LPC	177	*val = st->vref_mv;
	178	*val2 = chan->scan_type.realbits;
	179	return IIO_VAL_FRACTIONAL_LOG2;
33ad6b21 LPC	180	}
	181	return -EINVAL;
	182	}
	183
	184	static int ad5446_write_raw(struct iio_dev *indio_dev,
	185	struct iio_chan_spec const *chan,
	186	int val,
	187	int val2,
	188	long mask)
	189	{
	190	struct ad5446_state *st = iio_priv(indio_dev);
07ffd0d0	191	int ret = 0;
33ad6b21 LPC	192
33ad6b21 LPC	193	switch (mask) {
09f4eb40	194	case IIO_CHAN_INFO_RAW:
33ad6b21 LPC	195	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
	196	return -EINVAL;
	197
	198	val <<= chan->scan_type.shift;
	199	mutex_lock(&indio_dev->mlock);
	200	st->cached_val = val;
af836d9a	201	if (!st->pwr_down)
cae329e0	202	ret = st->chip_info->write(st, val);
33ad6b21 LPC	203	mutex_unlock(&indio_dev->mlock);
	204	break;
	205	default:
	206	ret = -EINVAL;
	207	}
	208
	209	return ret;
	210	}
	211
6fe8135f	212	static const struct iio_info ad5446_info = {
7389266c JC	213	.read_raw = ad5446_read_raw,
	214	.write_raw = ad5446_write_raw,
	215	.driver_module = THIS_MODULE,
	216	};
	217
fc52692c GKH	218	static int ad5446_probe(struct device dev, const char name,
fc52692c GKH	219	const struct ad5446_chip_info *chip_info)
b5a49481 MH	220	{
b5a49481 MH	221	struct ad5446_state *st;
86729fc4 JC	222	struct iio_dev *indio_dev;
86729fc4 JC	223	struct regulator *reg;
b5a49481 MH	224	int ret, voltage_uv = 0;
b5a49481 MH	225
ba727295	226	reg = devm_regulator_get(dev, "vcc");
86729fc4 JC	227	if (!IS_ERR(reg)) {
86729fc4 JC	228	ret = regulator_enable(reg);
b5a49481	229	if (ret)
ba727295	230	return ret;
b5a49481	231
13e57ee2 AL	232	ret = regulator_get_voltage(reg);
	233	if (ret < 0)
	234	goto error_disable_reg;
	235
	236	voltage_uv = ret;
b5a49481 MH	237	}
b5a49481 MH	238
ba727295	239	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
86729fc4 JC	240	if (indio_dev == NULL) {
	241	ret = -ENOMEM;
	242	goto error_disable_reg;
	243	}
	244	st = iio_priv(indio_dev);
3ec36a2c	245	st->chip_info = chip_info;
b5a49481	246
3ec36a2c	247	dev_set_drvdata(dev, indio_dev);
86729fc4	248	st->reg = reg;
3ec36a2c	249	st->dev = dev;
b5a49481	250
3ec36a2c JFD	251	/* Establish that the iio_dev is a child of the device */
	252	indio_dev->dev.parent = dev;
	253	indio_dev->name = name;
83f0f572	254	indio_dev->info = &ad5446_info;
86729fc4	255	indio_dev->modes = INDIO_DIRECT_MODE;
33ad6b21 LPC	256	indio_dev->channels = &st->chip_info->channel;
33ad6b21 LPC	257	indio_dev->num_channels = 1;
b5a49481	258
09d48aa9 LPC	259	st->pwr_down_mode = MODE_PWRDWN_1k;
09d48aa9 LPC	260
4e5d3f92	261	if (st->chip_info->int_vref_mv)
bbed4dc7	262	st->vref_mv = st->chip_info->int_vref_mv;
4e5d3f92 LPC	263	else if (voltage_uv)
	264	st->vref_mv = voltage_uv / 1000;
	265	else
3ec36a2c	266	dev_warn(dev, "reference voltage unspecified\n");
b5a49481	267
86729fc4	268	ret = iio_device_register(indio_dev);
b5a49481	269	if (ret)
ba727295	270	goto error_disable_reg;
b5a49481 MH	271
	272	return 0;
	273
b5a49481	274	error_disable_reg:
86729fc4 JC	275	if (!IS_ERR(reg))
86729fc4 JC	276	regulator_disable(reg);
b5a49481 MH	277	return ret;
	278	}
	279
3ec36a2c	280	static int ad5446_remove(struct device *dev)
b5a49481	281	{
3ec36a2c	282	struct iio_dev *indio_dev = dev_get_drvdata(dev);
86729fc4	283	struct ad5446_state *st = iio_priv(indio_dev);
b5a49481 MH	284
b5a49481 MH	285	iio_device_unregister(indio_dev);
ba727295	286	if (!IS_ERR(st->reg))
d2fffd6c	287	regulator_disable(st->reg);
d2fffd6c	288
b5a49481 MH	289	return 0;
	290	}
	291
3ec36a2c JFD	292	#if IS_ENABLED(CONFIG_SPI_MASTER)
	293
	294	static int ad5446_write(struct ad5446_state *st, unsigned val)
	295	{
	296	struct spi_device *spi = to_spi_device(st->dev);
	297	__be16 data = cpu_to_be16(val);
	298
	299	return spi_write(spi, &data, sizeof(data));
	300	}
	301
	302	static int ad5660_write(struct ad5446_state *st, unsigned val)
	303	{
	304	struct spi_device *spi = to_spi_device(st->dev);
	305	uint8_t data[3];
	306
	307	data[0] = (val >> 16) & 0xFF;
	308	data[1] = (val >> 8) & 0xFF;
	309	data[2] = val & 0xFF;
	310
	311	return spi_write(spi, data, sizeof(data));
	312	}
	313
	314	/**
	315	* ad5446_supported_spi_device_ids:
	316	* The AD5620/40/60 parts are available in different fixed internal reference
	317	* voltage options. The actual part numbers may look differently
	318	* (and a bit cryptic), however this style is used to make clear which
	319	* parts are supported here.
	320	*/
	321	enum ad5446_supported_spi_device_ids {
2fafbce2 LPC	322	ID_AD5300,
	323	ID_AD5310,
	324	ID_AD5320,
3ec36a2c JFD	325	ID_AD5444,
	326	ID_AD5446,
	327	ID_AD5450,
	328	ID_AD5451,
	329	ID_AD5541A,
	330	ID_AD5512A,
	331	ID_AD5553,
	332	ID_AD5601,
	333	ID_AD5611,
	334	ID_AD5621,
4fa2a9e4	335	ID_AD5641,
3ec36a2c JFD	336	ID_AD5620_2500,
	337	ID_AD5620_1250,
	338	ID_AD5640_2500,
	339	ID_AD5640_1250,
	340	ID_AD5660_2500,
	341	ID_AD5660_1250,
	342	ID_AD5662,
	343	};
	344
	345	static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
2fafbce2 LPC	346	[ID_AD5300] = {
	347	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	348	.write = ad5446_write,
	349	},
	350	[ID_AD5310] = {
	351	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	352	.write = ad5446_write,
	353	},
	354	[ID_AD5320] = {
	355	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	356	.write = ad5446_write,
	357	},
3ec36a2c JFD	358	[ID_AD5444] = {
	359	.channel = AD5446_CHANNEL(12, 16, 2),
	360	.write = ad5446_write,
	361	},
	362	[ID_AD5446] = {
	363	.channel = AD5446_CHANNEL(14, 16, 0),
	364	.write = ad5446_write,
	365	},
	366	[ID_AD5450] = {
	367	.channel = AD5446_CHANNEL(8, 16, 6),
	368	.write = ad5446_write,
	369	},
	370	[ID_AD5451] = {
	371	.channel = AD5446_CHANNEL(10, 16, 4),
	372	.write = ad5446_write,
	373	},
	374	[ID_AD5541A] = {
	375	.channel = AD5446_CHANNEL(16, 16, 0),
	376	.write = ad5446_write,
	377	},
	378	[ID_AD5512A] = {
	379	.channel = AD5446_CHANNEL(12, 16, 4),
	380	.write = ad5446_write,
	381	},
	382	[ID_AD5553] = {
	383	.channel = AD5446_CHANNEL(14, 16, 0),
	384	.write = ad5446_write,
	385	},
	386	[ID_AD5601] = {
	387	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
	388	.write = ad5446_write,
	389	},
	390	[ID_AD5611] = {
	391	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
	392	.write = ad5446_write,
	393	},
	394	[ID_AD5621] = {
	395	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	396	.write = ad5446_write,
	397	},
4fa2a9e4 AM	398	[ID_AD5641] = {
	399	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	400	.write = ad5446_write,
	401	},
3ec36a2c JFD	402	[ID_AD5620_2500] = {
	403	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	404	.int_vref_mv = 2500,
	405	.write = ad5446_write,
	406	},
	407	[ID_AD5620_1250] = {
	408	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
	409	.int_vref_mv = 1250,
	410	.write = ad5446_write,
	411	},
	412	[ID_AD5640_2500] = {
	413	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	414	.int_vref_mv = 2500,
	415	.write = ad5446_write,
	416	},
	417	[ID_AD5640_1250] = {
	418	.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
	419	.int_vref_mv = 1250,
	420	.write = ad5446_write,
	421	},
	422	[ID_AD5660_2500] = {
	423	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
	424	.int_vref_mv = 2500,
	425	.write = ad5660_write,
	426	},
	427	[ID_AD5660_1250] = {
	428	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
	429	.int_vref_mv = 1250,
	430	.write = ad5660_write,
	431	},
	432	[ID_AD5662] = {
	433	.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
	434	.write = ad5660_write,
	435	},
	436	};
	437
	438	static const struct spi_device_id ad5446_spi_ids[] = {
2fafbce2 LPC	439	{"ad5300", ID_AD5300},
	440	{"ad5310", ID_AD5310},
	441	{"ad5320", ID_AD5320},
b5a49481 MH	442	{"ad5444", ID_AD5444},
b5a49481 MH	443	{"ad5446", ID_AD5446},
779c0c46 LPC	444	{"ad5450", ID_AD5450},
	445	{"ad5451", ID_AD5451},
	446	{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
	447	{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
b5a49481	448	{"ad5512a", ID_AD5512A},
67d1c1f4	449	{"ad5541a", ID_AD5541A},
11a7df48 LPC	450	{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
11a7df48 LPC	451	{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
bd51c0b0	452	{"ad5553", ID_AD5553},
2b61535a MH	453	{"ad5601", ID_AD5601},
	454	{"ad5611", ID_AD5611},
	455	{"ad5621", ID_AD5621},
4fa2a9e4	456	{"ad5641", ID_AD5641},
d846263d MH	457	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	458	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	459	{"ad5640-2500", ID_AD5640_2500},
	460	{"ad5640-1250", ID_AD5640_1250},
	461	{"ad5660-2500", ID_AD5660_2500},
	462	{"ad5660-1250", ID_AD5660_1250},
18e5ab31	463	{"ad5662", ID_AD5662},
b5a49481 MH	464	{}
b5a49481 MH	465	};
3ec36a2c JFD	466	MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);
3ec36a2c JFD	467
fc52692c	468	static int ad5446_spi_probe(struct spi_device *spi)
3ec36a2c JFD	469	{
	470	const struct spi_device_id *id = spi_get_device_id(spi);
	471
	472	return ad5446_probe(&spi->dev, id->name,
	473	&ad5446_spi_chip_info[id->driver_data]);
	474	}
b5a49481	475
fc52692c	476	static int ad5446_spi_remove(struct spi_device *spi)
3ec36a2c JFD	477	{
	478	return ad5446_remove(&spi->dev);
	479	}
	480
	481	static struct spi_driver ad5446_spi_driver = {
b5a49481 MH	482	.driver = {
b5a49481 MH	483	.name = "ad5446",
b5a49481	484	},
3ec36a2c	485	.probe = ad5446_spi_probe,
fc52692c	486	.remove = ad5446_spi_remove,
3ec36a2c JFD	487	.id_table = ad5446_spi_ids,
	488	};
	489
	490	static int __init ad5446_spi_register_driver(void)
	491	{
	492	return spi_register_driver(&ad5446_spi_driver);
	493	}
	494
	495	static void ad5446_spi_unregister_driver(void)
	496	{
	497	spi_unregister_driver(&ad5446_spi_driver);
	498	}
	499
	500	#else
	501
	502	static inline int ad5446_spi_register_driver(void) { return 0; }
	503	static inline void ad5446_spi_unregister_driver(void) { }
	504
	505	#endif
	506
	507	#if IS_ENABLED(CONFIG_I2C)
	508
	509	static int ad5622_write(struct ad5446_state *st, unsigned val)
	510	{
	511	struct i2c_client *client = to_i2c_client(st->dev);
	512	__be16 data = cpu_to_be16(val);
	513
	514	return i2c_master_send(client, (char *)&data, sizeof(data));
	515	}
	516
	517	/**
	518	* ad5446_supported_i2c_device_ids:
	519	* The AD5620/40/60 parts are available in different fixed internal reference
	520	* voltage options. The actual part numbers may look differently
	521	* (and a bit cryptic), however this style is used to make clear which
	522	* parts are supported here.
	523	*/
	524	enum ad5446_supported_i2c_device_ids {
	525	ID_AD5602,
	526	ID_AD5612,
	527	ID_AD5622,
	528	};
	529
	530	static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
	531	[ID_AD5602] = {
	532	.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
	533	.write = ad5622_write,
	534	},
	535	[ID_AD5612] = {
	536	.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
	537	.write = ad5622_write,
	538	},
	539	[ID_AD5622] = {
	540	.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
	541	.write = ad5622_write,
	542	},
b5a49481	543	};
3ec36a2c	544
fc52692c GKH	545	static int ad5446_i2c_probe(struct i2c_client *i2c,
fc52692c GKH	546	const struct i2c_device_id *id)
3ec36a2c JFD	547	{
	548	return ad5446_probe(&i2c->dev, id->name,
	549	&ad5446_i2c_chip_info[id->driver_data]);
	550	}
	551
fc52692c	552	static int ad5446_i2c_remove(struct i2c_client *i2c)
3ec36a2c JFD	553	{
	554	return ad5446_remove(&i2c->dev);
	555	}
	556
	557	static const struct i2c_device_id ad5446_i2c_ids[] = {
bf832380 LPC	558	{"ad5301", ID_AD5602},
	559	{"ad5311", ID_AD5612},
	560	{"ad5321", ID_AD5622},
3ec36a2c JFD	561	{"ad5602", ID_AD5602},
	562	{"ad5612", ID_AD5612},
	563	{"ad5622", ID_AD5622},
	564	{}
	565	};
	566	MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
	567
	568	static struct i2c_driver ad5446_i2c_driver = {
	569	.driver = {
	570	.name = "ad5446",
3ec36a2c JFD	571	},
3ec36a2c JFD	572	.probe = ad5446_i2c_probe,
fc52692c	573	.remove = ad5446_i2c_remove,
3ec36a2c JFD	574	.id_table = ad5446_i2c_ids,
	575	};
	576
	577	static int __init ad5446_i2c_register_driver(void)
	578	{
	579	return i2c_add_driver(&ad5446_i2c_driver);
	580	}
	581
	582	static void __exit ad5446_i2c_unregister_driver(void)
	583	{
	584	i2c_del_driver(&ad5446_i2c_driver);
	585	}
	586
	587	#else
	588
	589	static inline int ad5446_i2c_register_driver(void) { return 0; }
	590	static inline void ad5446_i2c_unregister_driver(void) { }
	591
	592	#endif
	593
	594	static int __init ad5446_init(void)
	595	{
	596	int ret;
	597
	598	ret = ad5446_spi_register_driver();
	599	if (ret)
	600	return ret;
	601
	602	ret = ad5446_i2c_register_driver();
	603	if (ret) {
	604	ad5446_spi_unregister_driver();
	605	return ret;
	606	}
	607
	608	return 0;
	609	}
	610	module_init(ad5446_init);
	611
	612	static void __exit ad5446_exit(void)
	613	{
	614	ad5446_i2c_unregister_driver();
	615	ad5446_spi_unregister_driver();
	616	}
	617	module_exit(ad5446_exit);
b5a49481 MH	618
	619	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	620	MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
	621	MODULE_LICENSE("GPL v2");