[mirror_ubuntu-hirsute-kernel.git] / drivers / staging / 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/regulator/consumer.h>
#include <linux/err.h>
#include <linux/module.h>

#include "../iio.h"
#include "../sysfs.h"
#include "dac.h"

#include "ad5446.h"

static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
{
	st->data.d16 = cpu_to_be16(AD5446_LOAD | val);
}

static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
{
	st->data.d16 = cpu_to_be16(val);
}

static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
{
	st->data.d16 = cpu_to_be16(AD5620_LOAD | val);
}

static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
{
	val |= AD5660_LOAD;
	st->data.d24[0] = (val >> 16) & 0xFF;
	st->data.d24[1] = (val >> 8) & 0xFF;
	st->data.d24[2] = val & 0xFF;
}

static void ad5620_store_pwr_down(struct ad5446_state *st, unsigned mode)
{
	st->data.d16 = cpu_to_be16(mode << 14);
}

static void ad5660_store_pwr_down(struct ad5446_state *st, unsigned mode)
{
	unsigned val = mode << 16;

	st->data.d24[0] = (val >> 16) & 0xFF;
	st->data.d24[1] = (val >> 8) & 0xFF;
	st->data.d24[2] = val & 0xFF;
}

static ssize_t ad5446_write_powerdown_mode(struct device *dev,
				       struct device_attribute *attr,
				       const char *buf, size_t len)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);

	if (sysfs_streq(buf, "1kohm_to_gnd"))
		st->pwr_down_mode = MODE_PWRDWN_1k;
	else if (sysfs_streq(buf, "100kohm_to_gnd"))
		st->pwr_down_mode = MODE_PWRDWN_100k;
	else if (sysfs_streq(buf, "three_state"))
		st->pwr_down_mode = MODE_PWRDWN_TRISTATE;
	else
		return -EINVAL;

	return len;
}

static ssize_t ad5446_read_powerdown_mode(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);

	char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};

	return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
}

static ssize_t ad5446_read_dac_powerdown(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);

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

static ssize_t ad5446_write_dac_powerdown(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t len)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);
	unsigned long readin;
	int ret;

	ret = strict_strtol(buf, 10, &readin);
	if (ret)
		return ret;

	if (readin > 1)
		ret = -EINVAL;

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

	if (st->pwr_down)
		st->chip_info->store_pwr_down(st, st->pwr_down_mode);
	else
		st->chip_info->store_sample(st, st->cached_val);

	ret = spi_sync(st->spi, &st->msg);
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
}

static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO | S_IWUSR,
			ad5446_read_powerdown_mode,
			ad5446_write_powerdown_mode, 0);

static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
			"1kohm_to_gnd 100kohm_to_gnd three_state");

static IIO_DEVICE_ATTR(out_voltage0_powerdown, S_IRUGO | S_IWUSR,
			ad5446_read_dac_powerdown,
			ad5446_write_dac_powerdown, 0);

static struct attribute *ad5446_attributes[] = {
	&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
	&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group ad5446_attribute_group = {
	.attrs = ad5446_attributes,
};

#define AD5446_CHANNEL(bits, storage, shift) { \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.output = 1, \
	.channel = 0, \
	.info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \
	.scan_type = IIO_ST('u', (bits), (storage), (shift)) \
}

static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
	[ID_AD5444] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.store_sample = ad5446_store_sample,
	},
	[ID_AD5446] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.store_sample = ad5446_store_sample,
	},
	[ID_AD5541A] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.store_sample = ad5542_store_sample,
	},
	[ID_AD5542A] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.store_sample = ad5542_store_sample,
	},
	[ID_AD5543] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.store_sample = ad5542_store_sample,
	},
	[ID_AD5512A] = {
		.channel = AD5446_CHANNEL(12, 16, 4),
		.store_sample = ad5542_store_sample,
	},
	[ID_AD5553] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.store_sample = ad5542_store_sample,
	},
	[ID_AD5601] = {
		.channel = AD5446_CHANNEL(8, 16, 6),
		.store_sample = ad5542_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5611] = {
		.channel = AD5446_CHANNEL(10, 16, 4),
		.store_sample = ad5542_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5621] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.store_sample = ad5542_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5620_2500] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.int_vref_mv = 2500,
		.store_sample = ad5620_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5620_1250] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.int_vref_mv = 1250,
		.store_sample = ad5620_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5640_2500] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.int_vref_mv = 2500,
		.store_sample = ad5620_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5640_1250] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.int_vref_mv = 1250,
		.store_sample = ad5620_store_sample,
		.store_pwr_down = ad5620_store_pwr_down,
	},
	[ID_AD5660_2500] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.int_vref_mv = 2500,
		.store_sample = ad5660_store_sample,
		.store_pwr_down = ad5660_store_pwr_down,
	},
	[ID_AD5660_1250] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.int_vref_mv = 1250,
		.store_sample = ad5660_store_sample,
		.store_pwr_down = ad5660_store_pwr_down,
	},
};

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_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;

	switch (mask) {
	case 0:
		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;
		st->chip_info->store_sample(st, val);
		ret = spi_sync(st->spi, &st->msg);
		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,
	.attrs = &ad5446_attribute_group,
	.driver_module = THIS_MODULE,
};

static const struct iio_info ad5446_info_no_pwr_down = {
	.read_raw = ad5446_read_raw,
	.write_raw = ad5446_write_raw,
	.driver_module = THIS_MODULE,
};

static int __devinit ad5446_probe(struct spi_device *spi)
{
	struct ad5446_state *st;
	struct iio_dev *indio_dev;
	struct regulator *reg;
	int ret, voltage_uv = 0;

	reg = regulator_get(&spi->dev, "vcc");
	if (!IS_ERR(reg)) {
		ret = regulator_enable(reg);
		if (ret)
			goto error_put_reg;

		voltage_uv = regulator_get_voltage(reg);
	}

	indio_dev = iio_allocate_device(sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_disable_reg;
	}
	st = iio_priv(indio_dev);
	st->chip_info =
		&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];

	spi_set_drvdata(spi, indio_dev);
	st->reg = reg;
	st->spi = spi;

	/* Establish that the iio_dev is a child of the spi device */
	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = spi_get_device_id(spi)->name;
	if (st->chip_info->store_pwr_down)
		indio_dev->info = &ad5446_info;
	else
		indio_dev->info = &ad5446_info_no_pwr_down;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = &st->chip_info->channel;
	indio_dev->num_channels = 1;

	/* Setup default message */

	st->xfer.tx_buf = &st->data;
	st->xfer.len = st->chip_info->channel.scan_type.storagebits / 8;

	spi_message_init(&st->msg);
	spi_message_add_tail(&st->xfer, &st->msg);

	switch (spi_get_device_id(spi)->driver_data) {
	case ID_AD5620_2500:
	case ID_AD5620_1250:
	case ID_AD5640_2500:
	case ID_AD5640_1250:
	case ID_AD5660_2500:
	case ID_AD5660_1250:
		st->vref_mv = st->chip_info->int_vref_mv;
		break;
	default:
		if (voltage_uv)
			st->vref_mv = voltage_uv / 1000;
		else
			dev_warn(&spi->dev,
				 "reference voltage unspecified\n");
	}

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

	return 0;

error_free_device:
	iio_free_device(indio_dev);
error_disable_reg:
	if (!IS_ERR(reg))
		regulator_disable(reg);
error_put_reg:
	if (!IS_ERR(reg))
		regulator_put(reg);

	return ret;
}

static int ad5446_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5446_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!IS_ERR(st->reg)) {
		regulator_disable(st->reg);
		regulator_put(st->reg);
	}
	iio_free_device(indio_dev);

	return 0;
}

static const struct spi_device_id ad5446_id[] = {
	{"ad5444", ID_AD5444},
	{"ad5446", ID_AD5446},
	{"ad5512a", ID_AD5512A},
	{"ad5541a", ID_AD5541A},
	{"ad5542a", ID_AD5542A},
	{"ad5543", ID_AD5543},
	{"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},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5446_id);

static struct spi_driver ad5446_driver = {
	.driver = {
		.name	= "ad5446",
		.owner	= THIS_MODULE,
	},
	.probe		= ad5446_probe,
	.remove		= __devexit_p(ad5446_remove),
	.id_table	= ad5446_id,
};
module_spi_driver(ad5446_driver);

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>
	17	#include <linux/regulator/consumer.h>
	18	#include <linux/err.h>
99c97852	19	#include <linux/module.h>
b5a49481 MH	20
	21	#include "../iio.h"
	22	#include "../sysfs.h"
	23	#include "dac.h"
	24
	25	#include "ad5446.h"
	26
d846263d MH	27	static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
d846263d MH	28	{
33ad6b21	29	st->data.d16 = cpu_to_be16(AD5446_LOAD \| val);
d846263d MH	30	}
	31
	32	static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
	33	{
33ad6b21	34	st->data.d16 = cpu_to_be16(val);
d846263d MH	35	}
	36
	37	static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
	38	{
33ad6b21	39	st->data.d16 = cpu_to_be16(AD5620_LOAD \| val);
d846263d MH	40	}
	41
	42	static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
	43	{
	44	val \|= AD5660_LOAD;
	45	st->data.d24[0] = (val >> 16) & 0xFF;
	46	st->data.d24[1] = (val >> 8) & 0xFF;
	47	st->data.d24[2] = val & 0xFF;
	48	}
	49
bbed4dc7 MH	50	static void ad5620_store_pwr_down(struct ad5446_state *st, unsigned mode)
	51	{
	52	st->data.d16 = cpu_to_be16(mode << 14);
	53	}
	54
	55	static void ad5660_store_pwr_down(struct ad5446_state *st, unsigned mode)
	56	{
	57	unsigned val = mode << 16;
	58
	59	st->data.d24[0] = (val >> 16) & 0xFF;
	60	st->data.d24[1] = (val >> 8) & 0xFF;
	61	st->data.d24[2] = val & 0xFF;
	62	}
	63
bbed4dc7 MH	64	static ssize_t ad5446_write_powerdown_mode(struct device *dev,
	65	struct device_attribute *attr,
	66	const char *buf, size_t len)
	67	{
638e59fc JC	68	struct iio_dev *indio_dev = dev_get_drvdata(dev);
638e59fc JC	69	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7 MH	70
	71	if (sysfs_streq(buf, "1kohm_to_gnd"))
	72	st->pwr_down_mode = MODE_PWRDWN_1k;
	73	else if (sysfs_streq(buf, "100kohm_to_gnd"))
	74	st->pwr_down_mode = MODE_PWRDWN_100k;
	75	else if (sysfs_streq(buf, "three_state"))
	76	st->pwr_down_mode = MODE_PWRDWN_TRISTATE;
	77	else
	78	return -EINVAL;
	79
	80	return len;
	81	}
	82
	83	static ssize_t ad5446_read_powerdown_mode(struct device *dev,
	84	struct device_attribute attr, char buf)
	85	{
638e59fc JC	86	struct iio_dev *indio_dev = dev_get_drvdata(dev);
638e59fc JC	87	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7 MH	88
	89	char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
	90
	91	return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
	92	}
	93
	94	static ssize_t ad5446_read_dac_powerdown(struct device *dev,
	95	struct device_attribute *attr,
	96	char *buf)
	97	{
638e59fc JC	98	struct iio_dev *indio_dev = dev_get_drvdata(dev);
638e59fc JC	99	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7 MH	100
	101	return sprintf(buf, "%d\n", st->pwr_down);
	102	}
	103
	104	static ssize_t ad5446_write_dac_powerdown(struct device *dev,
	105	struct device_attribute *attr,
	106	const char *buf, size_t len)
	107	{
638e59fc JC	108	struct iio_dev *indio_dev = dev_get_drvdata(dev);
638e59fc JC	109	struct ad5446_state *st = iio_priv(indio_dev);
bbed4dc7 MH	110	unsigned long readin;
	111	int ret;
	112
	113	ret = strict_strtol(buf, 10, &readin);
	114	if (ret)
	115	return ret;
	116
	117	if (readin > 1)
	118	ret = -EINVAL;
	119
638e59fc	120	mutex_lock(&indio_dev->mlock);
bbed4dc7 MH	121	st->pwr_down = readin;
	122
	123	if (st->pwr_down)
	124	st->chip_info->store_pwr_down(st, st->pwr_down_mode);
	125	else
	126	st->chip_info->store_sample(st, st->cached_val);
	127
	128	ret = spi_sync(st->spi, &st->msg);
638e59fc	129	mutex_unlock(&indio_dev->mlock);
bbed4dc7 MH	130
	131	return ret ? ret : len;
	132	}
	133
322c9563	134	static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO \| S_IWUSR,
bbed4dc7 MH	135	ad5446_read_powerdown_mode,
	136	ad5446_write_powerdown_mode, 0);
	137
322c9563	138	static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
bbed4dc7 MH	139	"1kohm_to_gnd 100kohm_to_gnd three_state");
bbed4dc7 MH	140
322c9563	141	static IIO_DEVICE_ATTR(out_voltage0_powerdown, S_IRUGO \| S_IWUSR,
bbed4dc7 MH	142	ad5446_read_dac_powerdown,
	143	ad5446_write_dac_powerdown, 0);
	144
b5a49481	145	static struct attribute *ad5446_attributes[] = {
322c9563 JC	146	&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
	147	&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
	148	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
b5a49481 MH	149	NULL,
	150	};
	151
	152	static const struct attribute_group ad5446_attribute_group = {
	153	.attrs = ad5446_attributes,
	154	};
	155
33ad6b21 LPC	156	#define AD5446_CHANNEL(bits, storage, shift) { \
	157	.type = IIO_VOLTAGE, \
	158	.indexed = 1, \
	159	.output = 1, \
	160	.channel = 0, \
	161	.info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \
	162	.scan_type = IIO_ST('u', (bits), (storage), (shift)) \
	163	}
	164
b5a49481 MH	165	static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
b5a49481 MH	166	[ID_AD5444] = {
33ad6b21	167	.channel = AD5446_CHANNEL(12, 16, 2),
d846263d	168	.store_sample = ad5446_store_sample,
b5a49481 MH	169	},
b5a49481 MH	170	[ID_AD5446] = {
33ad6b21	171	.channel = AD5446_CHANNEL(14, 16, 0),
d846263d	172	.store_sample = ad5446_store_sample,
b5a49481	173	},
67d1c1f4	174	[ID_AD5541A] = {
33ad6b21	175	.channel = AD5446_CHANNEL(16, 16, 0),
67d1c1f4 MH	176	.store_sample = ad5542_store_sample,
67d1c1f4 MH	177	},
b5a49481	178	[ID_AD5542A] = {
33ad6b21	179	.channel = AD5446_CHANNEL(16, 16, 0),
d846263d	180	.store_sample = ad5542_store_sample,
b5a49481	181	},
0772268a	182	[ID_AD5543] = {
33ad6b21	183	.channel = AD5446_CHANNEL(16, 16, 0),
0772268a MH	184	.store_sample = ad5542_store_sample,
0772268a MH	185	},
b5a49481	186	[ID_AD5512A] = {
33ad6b21	187	.channel = AD5446_CHANNEL(12, 16, 4),
d846263d MH	188	.store_sample = ad5542_store_sample,
d846263d MH	189	},
0772268a	190	[ID_AD5553] = {
33ad6b21	191	.channel = AD5446_CHANNEL(14, 16, 0),
0772268a MH	192	.store_sample = ad5542_store_sample,
0772268a MH	193	},
2b61535a	194	[ID_AD5601] = {
33ad6b21	195	.channel = AD5446_CHANNEL(8, 16, 6),
2b61535a MH	196	.store_sample = ad5542_store_sample,
	197	.store_pwr_down = ad5620_store_pwr_down,
	198	},
	199	[ID_AD5611] = {
33ad6b21	200	.channel = AD5446_CHANNEL(10, 16, 4),
2b61535a MH	201	.store_sample = ad5542_store_sample,
	202	.store_pwr_down = ad5620_store_pwr_down,
	203	},
	204	[ID_AD5621] = {
33ad6b21	205	.channel = AD5446_CHANNEL(12, 16, 2),
2b61535a MH	206	.store_sample = ad5542_store_sample,
	207	.store_pwr_down = ad5620_store_pwr_down,
	208	},
d846263d	209	[ID_AD5620_2500] = {
33ad6b21	210	.channel = AD5446_CHANNEL(12, 16, 2),
d846263d MH	211	.int_vref_mv = 2500,
d846263d MH	212	.store_sample = ad5620_store_sample,
bbed4dc7	213	.store_pwr_down = ad5620_store_pwr_down,
d846263d MH	214	},
d846263d MH	215	[ID_AD5620_1250] = {
33ad6b21	216	.channel = AD5446_CHANNEL(12, 16, 2),
d846263d MH	217	.int_vref_mv = 1250,
d846263d MH	218	.store_sample = ad5620_store_sample,
bbed4dc7	219	.store_pwr_down = ad5620_store_pwr_down,
d846263d MH	220	},
d846263d MH	221	[ID_AD5640_2500] = {
33ad6b21	222	.channel = AD5446_CHANNEL(14, 16, 0),
d846263d MH	223	.int_vref_mv = 2500,
d846263d MH	224	.store_sample = ad5620_store_sample,
bbed4dc7	225	.store_pwr_down = ad5620_store_pwr_down,
d846263d MH	226	},
d846263d MH	227	[ID_AD5640_1250] = {
33ad6b21	228	.channel = AD5446_CHANNEL(14, 16, 0),
d846263d MH	229	.int_vref_mv = 1250,
d846263d MH	230	.store_sample = ad5620_store_sample,
bbed4dc7	231	.store_pwr_down = ad5620_store_pwr_down,
d846263d MH	232	},
d846263d MH	233	[ID_AD5660_2500] = {
33ad6b21	234	.channel = AD5446_CHANNEL(16, 16, 0),
d846263d MH	235	.int_vref_mv = 2500,
d846263d MH	236	.store_sample = ad5660_store_sample,
bbed4dc7	237	.store_pwr_down = ad5660_store_pwr_down,
d846263d MH	238	},
d846263d MH	239	[ID_AD5660_1250] = {
33ad6b21	240	.channel = AD5446_CHANNEL(16, 16, 0),
d846263d MH	241	.int_vref_mv = 1250,
d846263d MH	242	.store_sample = ad5660_store_sample,
bbed4dc7	243	.store_pwr_down = ad5660_store_pwr_down,
b5a49481 MH	244	},
	245	};
	246
33ad6b21 LPC	247	static int ad5446_read_raw(struct iio_dev *indio_dev,
	248	struct iio_chan_spec const *chan,
	249	int *val,
	250	int *val2,
	251	long m)
	252	{
	253	struct ad5446_state *st = iio_priv(indio_dev);
	254	unsigned long scale_uv;
	255
	256	switch (m) {
	257	case IIO_CHAN_INFO_SCALE:
	258	scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
	259	*val = scale_uv / 1000;
	260	val2 = (scale_uv % 1000) 1000;
	261	return IIO_VAL_INT_PLUS_MICRO;
	262
	263	}
	264	return -EINVAL;
	265	}
	266
	267	static int ad5446_write_raw(struct iio_dev *indio_dev,
	268	struct iio_chan_spec const *chan,
	269	int val,
	270	int val2,
	271	long mask)
	272	{
	273	struct ad5446_state *st = iio_priv(indio_dev);
	274	int ret;
	275
	276	switch (mask) {
	277	case 0:
	278	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
	279	return -EINVAL;
	280
	281	val <<= chan->scan_type.shift;
	282	mutex_lock(&indio_dev->mlock);
	283	st->cached_val = val;
	284	st->chip_info->store_sample(st, val);
	285	ret = spi_sync(st->spi, &st->msg);
	286	mutex_unlock(&indio_dev->mlock);
	287	break;
	288	default:
	289	ret = -EINVAL;
	290	}
	291
	292	return ret;
	293	}
	294
6fe8135f	295	static const struct iio_info ad5446_info = {
33ad6b21 LPC	296	.read_raw = ad5446_read_raw,
33ad6b21 LPC	297	.write_raw = ad5446_write_raw,
6fe8135f JC	298	.attrs = &ad5446_attribute_group,
	299	.driver_module = THIS_MODULE,
	300	};
	301
7389266c JC	302	static const struct iio_info ad5446_info_no_pwr_down = {
	303	.read_raw = ad5446_read_raw,
	304	.write_raw = ad5446_write_raw,
	305	.driver_module = THIS_MODULE,
	306	};
	307
b5a49481 MH	308	static int __devinit ad5446_probe(struct spi_device *spi)
	309	{
	310	struct ad5446_state *st;
86729fc4 JC	311	struct iio_dev *indio_dev;
86729fc4 JC	312	struct regulator *reg;
b5a49481 MH	313	int ret, voltage_uv = 0;
b5a49481 MH	314
86729fc4 JC	315	reg = regulator_get(&spi->dev, "vcc");
	316	if (!IS_ERR(reg)) {
	317	ret = regulator_enable(reg);
b5a49481 MH	318	if (ret)
	319	goto error_put_reg;
	320
86729fc4	321	voltage_uv = regulator_get_voltage(reg);
b5a49481 MH	322	}
b5a49481 MH	323
86729fc4 JC	324	indio_dev = iio_allocate_device(sizeof(*st));
	325	if (indio_dev == NULL) {
	326	ret = -ENOMEM;
	327	goto error_disable_reg;
	328	}
	329	st = iio_priv(indio_dev);
b5a49481 MH	330	st->chip_info =
	331	&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
	332
86729fc4 JC	333	spi_set_drvdata(spi, indio_dev);
86729fc4 JC	334	st->reg = reg;
b5a49481 MH	335	st->spi = spi;
b5a49481 MH	336
4abf6f8b	337	/* Establish that the iio_dev is a child of the spi device */
86729fc4 JC	338	indio_dev->dev.parent = &spi->dev;
86729fc4 JC	339	indio_dev->name = spi_get_device_id(spi)->name;
7389266c JC	340	if (st->chip_info->store_pwr_down)
	341	indio_dev->info = &ad5446_info;
	342	else
	343	indio_dev->info = &ad5446_info_no_pwr_down;
86729fc4	344	indio_dev->modes = INDIO_DIRECT_MODE;
33ad6b21 LPC	345	indio_dev->channels = &st->chip_info->channel;
33ad6b21 LPC	346	indio_dev->num_channels = 1;
b5a49481 MH	347
	348	/* Setup default message */
	349
d846263d	350	st->xfer.tx_buf = &st->data;
33ad6b21	351	st->xfer.len = st->chip_info->channel.scan_type.storagebits / 8;
b5a49481 MH	352
	353	spi_message_init(&st->msg);
	354	spi_message_add_tail(&st->xfer, &st->msg);
	355
d846263d	356	switch (spi_get_device_id(spi)->driver_data) {
bbed4dc7 MH	357	case ID_AD5620_2500:
	358	case ID_AD5620_1250:
	359	case ID_AD5640_2500:
	360	case ID_AD5640_1250:
	361	case ID_AD5660_2500:
	362	case ID_AD5660_1250:
	363	st->vref_mv = st->chip_info->int_vref_mv;
	364	break;
	365	default:
	366	if (voltage_uv)
	367	st->vref_mv = voltage_uv / 1000;
	368	else
	369	dev_warn(&spi->dev,
	370	"reference voltage unspecified\n");
d846263d	371	}
b5a49481	372
86729fc4	373	ret = iio_device_register(indio_dev);
b5a49481 MH	374	if (ret)
	375	goto error_free_device;
	376
	377	return 0;
	378
	379	error_free_device:
86729fc4	380	iio_free_device(indio_dev);
b5a49481	381	error_disable_reg:
86729fc4 JC	382	if (!IS_ERR(reg))
86729fc4 JC	383	regulator_disable(reg);
b5a49481	384	error_put_reg:
86729fc4 JC	385	if (!IS_ERR(reg))
	386	regulator_put(reg);
	387
b5a49481 MH	388	return ret;
	389	}
	390
	391	static int ad5446_remove(struct spi_device *spi)
	392	{
86729fc4 JC	393	struct iio_dev *indio_dev = spi_get_drvdata(spi);
86729fc4 JC	394	struct ad5446_state *st = iio_priv(indio_dev);
b5a49481 MH	395
b5a49481 MH	396	iio_device_unregister(indio_dev);
d2fffd6c JC	397	if (!IS_ERR(st->reg)) {
	398	regulator_disable(st->reg);
	399	regulator_put(st->reg);
b5a49481	400	}
d2fffd6c JC	401	iio_free_device(indio_dev);
d2fffd6c JC	402
b5a49481 MH	403	return 0;
	404	}
	405
	406	static const struct spi_device_id ad5446_id[] = {
	407	{"ad5444", ID_AD5444},
	408	{"ad5446", ID_AD5446},
b5a49481	409	{"ad5512a", ID_AD5512A},
67d1c1f4	410	{"ad5541a", ID_AD5541A},
bd51c0b0 MH	411	{"ad5542a", ID_AD5542A},
	412	{"ad5543", ID_AD5543},
	413	{"ad5553", ID_AD5553},
2b61535a MH	414	{"ad5601", ID_AD5601},
	415	{"ad5611", ID_AD5611},
	416	{"ad5621", ID_AD5621},
d846263d MH	417	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	418	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	419	{"ad5640-2500", ID_AD5640_2500},
	420	{"ad5640-1250", ID_AD5640_1250},
	421	{"ad5660-2500", ID_AD5660_2500},
	422	{"ad5660-1250", ID_AD5660_1250},
b5a49481 MH	423	{}
b5a49481 MH	424	};
55e4390c	425	MODULE_DEVICE_TABLE(spi, ad5446_id);
b5a49481 MH	426
	427	static struct spi_driver ad5446_driver = {
	428	.driver = {
	429	.name = "ad5446",
b5a49481 MH	430	.owner = THIS_MODULE,
	431	},
	432	.probe = ad5446_probe,
	433	.remove = __devexit_p(ad5446_remove),
	434	.id_table = ad5446_id,
	435	};
ae6ae6fe	436	module_spi_driver(ad5446_driver);
b5a49481 MH	437
	438	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	439	MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
	440	MODULE_LICENSE("GPL v2");