[deliverable/linux.git] / drivers / iio / dac / ad5504.c

/*
 * AD5504, AD5501 High Voltage Digital to Analog Converter
 *
 * Copyright 2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2.
 */

#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/dac/ad5504.h>

#define AD5505_BITS			12
#define AD5504_RES_MASK			((1 << (AD5505_BITS)) - 1)

#define AD5504_CMD_READ			(1 << 15)
#define AD5504_CMD_WRITE		(0 << 15)
#define AD5504_ADDR(addr)		((addr) << 12)

/* Registers */
#define AD5504_ADDR_NOOP		0
#define AD5504_ADDR_DAC(x)		((x) + 1)
#define AD5504_ADDR_ALL_DAC		5
#define AD5504_ADDR_CTRL		7

/* Control Register */
#define AD5504_DAC_PWR(ch)		((ch) << 2)
#define AD5504_DAC_PWRDWN_MODE(mode)	((mode) << 6)
#define AD5504_DAC_PWRDN_20K		0
#define AD5504_DAC_PWRDN_3STATE		1

/**
 * struct ad5446_state - driver instance specific data
 * @us:			spi_device
 * @reg:		supply regulator
 * @vref_mv:		actual reference voltage used
 * @pwr_down_mask	power down mask
 * @pwr_down_mode	current power down mode
 */

struct ad5504_state {
	struct spi_device		*spi;
	struct regulator		*reg;
	unsigned short			vref_mv;
	unsigned			pwr_down_mask;
	unsigned			pwr_down_mode;
};

/**
 * ad5504_supported_device_ids:
 */

enum ad5504_supported_device_ids {
	ID_AD5504,
	ID_AD5501,
};

static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
{
	u16 tmp = cpu_to_be16(AD5504_CMD_WRITE |
			      AD5504_ADDR(addr) |
			      (val & AD5504_RES_MASK));

	return spi_write(spi, (u8 *)&tmp, 2);
}

static int ad5504_spi_read(struct spi_device *spi, u8 addr)
{
	u16 tmp = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
	u16 val;
	int ret;
	struct spi_transfer	t = {
			.tx_buf		= &tmp,
			.rx_buf		= &val,
			.len		= 2,
		};
	struct spi_message	m;

	spi_message_init(&m);
	spi_message_add_tail(&t, &m);
	ret = spi_sync(spi, &m);

	if (ret < 0)
		return ret;

	return be16_to_cpu(val) & AD5504_RES_MASK;
}

static int ad5504_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5504_state *st = iio_priv(indio_dev);
	unsigned long scale_uv;
	int ret;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		ret = ad5504_spi_read(st->spi, chan->address);
		if (ret < 0)
			return ret;

		*val = ret;

		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 ad5504_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct ad5504_state *st = iio_priv(indio_dev);
	int ret;

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

		return ad5504_spi_write(st->spi, chan->address, val);
	default:
		ret = -EINVAL;
	}

	return -EINVAL;
}

static const char * const ad5504_powerdown_modes[] = {
	"20kohm_to_gnd",
	"three_state",
};

static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5504_state *st = iio_priv(indio_dev);

	return st->pwr_down_mode;
}

static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5504_state *st = iio_priv(indio_dev);

	st->pwr_down_mode = mode;

	return 0;
}

static const struct iio_enum ad5504_powerdown_mode_enum = {
	.items = ad5504_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5504_powerdown_modes),
	.get = ad5504_get_powerdown_mode,
	.set = ad5504_set_powerdown_mode,
};

static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct ad5504_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n",
			!(st->pwr_down_mask & (1 << chan->channel)));
}

static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
	size_t len)
{
	bool pwr_down;
	int ret;
	struct ad5504_state *st = iio_priv(indio_dev);

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

	if (pwr_down)
		st->pwr_down_mask |= (1 << chan->channel);
	else
		st->pwr_down_mask &= ~(1 << chan->channel);

	ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL,
				AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
				AD5504_DAC_PWR(st->pwr_down_mask));

	/* writes to the CTRL register must be followed by a NOOP */
	ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0);

	return ret ? ret : len;
}

static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");

static struct attribute *ad5504_ev_attributes[] = {
	&iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
	&iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
	NULL,
};

static struct attribute_group ad5504_ev_attribute_group = {
	.attrs = ad5504_ev_attributes,
	.name = "events",
};

static irqreturn_t ad5504_event_handler(int irq, void *private)
{
	iio_push_event(private,
		       IIO_UNMOD_EVENT_CODE(IIO_TEMP,
					    0,
					    IIO_EV_TYPE_THRESH,
					    IIO_EV_DIR_RISING),
		       iio_get_time_ns());

	return IRQ_HANDLED;
}

static const struct iio_info ad5504_info = {
	.write_raw = ad5504_write_raw,
	.read_raw = ad5504_read_raw,
	.event_attrs = &ad5504_ev_attribute_group,
	.driver_module = THIS_MODULE,
};

static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
	{
		.name = "powerdown",
		.read = ad5504_read_dac_powerdown,
		.write = ad5504_write_dac_powerdown,
	},
	IIO_ENUM("powerdown_mode", true, &ad5504_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
	{ },
};

#define AD5504_CHANNEL(_chan) { \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.output = 1, \
	.channel = (_chan), \
	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
		     IIO_CHAN_INFO_SCALE_SHARED_BIT, \
	.address = AD5504_ADDR_DAC(_chan), \
	.scan_type = IIO_ST('u', 12, 16, 0), \
	.ext_info = ad5504_ext_info, \
}

static const struct iio_chan_spec ad5504_channels[] = {
	AD5504_CHANNEL(0),
	AD5504_CHANNEL(1),
	AD5504_CHANNEL(2),
	AD5504_CHANNEL(3),
};

static int __devinit ad5504_probe(struct spi_device *spi)
{
	struct ad5504_platform_data *pdata = spi->dev.platform_data;
	struct iio_dev *indio_dev;
	struct ad5504_state *st;
	struct regulator *reg;
	int ret, voltage_uv = 0;

	indio_dev = iio_device_alloc(sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
	}
	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);
	}

	spi_set_drvdata(spi, indio_dev);
	st = iio_priv(indio_dev);
	if (voltage_uv)
		st->vref_mv = voltage_uv / 1000;
	else if (pdata)
		st->vref_mv = pdata->vref_mv;
	else
		dev_warn(&spi->dev, "reference voltage unspecified\n");

	st->reg = reg;
	st->spi = spi;
	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = spi_get_device_id(st->spi)->name;
	indio_dev->info = &ad5504_info;
	if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
		indio_dev->num_channels = 1;
	else
		indio_dev->num_channels = 4;
	indio_dev->channels = ad5504_channels;
	indio_dev->modes = INDIO_DIRECT_MODE;

	if (spi->irq) {
		ret = request_threaded_irq(spi->irq,
					   NULL,
					   &ad5504_event_handler,
					   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					   spi_get_device_id(st->spi)->name,
					   indio_dev);
		if (ret)
			goto error_disable_reg;
	}

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

	return 0;

error_free_irq:
	if (spi->irq)
		free_irq(spi->irq, indio_dev);
error_disable_reg:
	if (!IS_ERR(reg))
		regulator_disable(reg);
error_put_reg:
	if (!IS_ERR(reg))
		regulator_put(reg);

	iio_device_free(indio_dev);
error_ret:
	return ret;
}

static int __devexit ad5504_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5504_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (spi->irq)
		free_irq(spi->irq, indio_dev);

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

	return 0;
}

static const struct spi_device_id ad5504_id[] = {
	{"ad5504", ID_AD5504},
	{"ad5501", ID_AD5501},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5504_id);

static struct spi_driver ad5504_driver = {
	.driver = {
		   .name = "ad5504",
		   .owner = THIS_MODULE,
		   },
	.probe = ad5504_probe,
	.remove = __devexit_p(ad5504_remove),
	.id_table = ad5504_id,
};
module_spi_driver(ad5504_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
59c23eab MH	1	/*
	2	* AD5504, AD5501 High Voltage Digital to Analog Converter
	3	*
	4	* Copyright 2011 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2.
	7	*/
	8
	9	#include <linux/interrupt.h>
59c23eab MH	10	#include <linux/fs.h>
	11	#include <linux/device.h>
	12	#include <linux/kernel.h>
	13	#include <linux/spi/spi.h>
	14	#include <linux/slab.h>
	15	#include <linux/sysfs.h>
	16	#include <linux/regulator/consumer.h>
99c97852	17	#include <linux/module.h>
59c23eab	18
06458e27 JC	19	#include <linux/iio/iio.h>
	20	#include <linux/iio/sysfs.h>
	21	#include <linux/iio/events.h>
dbdc025b	22	#include <linux/iio/dac/ad5504.h>
59c23eab	23
a98348b7 LPC	24	#define AD5505_BITS 12
	25	#define AD5504_RES_MASK ((1 << (AD5505_BITS)) - 1)
	26
	27	#define AD5504_CMD_READ (1 << 15)
	28	#define AD5504_CMD_WRITE (0 << 15)
	29	#define AD5504_ADDR(addr) ((addr) << 12)
	30
	31	/* Registers */
	32	#define AD5504_ADDR_NOOP 0
	33	#define AD5504_ADDR_DAC(x) ((x) + 1)
	34	#define AD5504_ADDR_ALL_DAC 5
	35	#define AD5504_ADDR_CTRL 7
	36
	37	/* Control Register */
	38	#define AD5504_DAC_PWR(ch) ((ch) << 2)
	39	#define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
	40	#define AD5504_DAC_PWRDN_20K 0
	41	#define AD5504_DAC_PWRDN_3STATE 1
	42
	43	/**
	44	* struct ad5446_state - driver instance specific data
	45	* @us: spi_device
	46	* @reg: supply regulator
	47	* @vref_mv: actual reference voltage used
	48	* @pwr_down_mask power down mask
	49	* @pwr_down_mode current power down mode
	50	*/
	51
	52	struct ad5504_state {
	53	struct spi_device *spi;
	54	struct regulator *reg;
	55	unsigned short vref_mv;
	56	unsigned pwr_down_mask;
	57	unsigned pwr_down_mode;
	58	};
	59
	60	/**
	61	* ad5504_supported_device_ids:
	62	*/
	63
	64	enum ad5504_supported_device_ids {
	65	ID_AD5504,
	66	ID_AD5501,
	67	};
	68
59c23eab MH	69	static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
	70	{
	71	u16 tmp = cpu_to_be16(AD5504_CMD_WRITE \|
	72	AD5504_ADDR(addr) \|
	73	(val & AD5504_RES_MASK));
	74
	75	return spi_write(spi, (u8 *)&tmp, 2);
	76	}
	77
a7b15288	78	static int ad5504_spi_read(struct spi_device *spi, u8 addr)
59c23eab MH	79	{
59c23eab MH	80	u16 tmp = cpu_to_be16(AD5504_CMD_READ \| AD5504_ADDR(addr));
a7b15288	81	u16 val;
59c23eab MH	82	int ret;
	83	struct spi_transfer t = {
	84	.tx_buf = &tmp,
a7b15288	85	.rx_buf = &val,
59c23eab MH	86	.len = 2,
	87	};
	88	struct spi_message m;
	89
	90	spi_message_init(&m);
	91	spi_message_add_tail(&t, &m);
	92	ret = spi_sync(spi, &m);
	93
a7b15288 LPC	94	if (ret < 0)
a7b15288 LPC	95	return ret;
59c23eab	96
a7b15288	97	return be16_to_cpu(val) & AD5504_RES_MASK;
59c23eab MH	98	}
59c23eab MH	99
a7b15288 LPC	100	static int ad5504_read_raw(struct iio_dev *indio_dev,
	101	struct iio_chan_spec const *chan,
	102	int *val,
	103	int *val2,
	104	long m)
59c23eab	105	{
a3684ded	106	struct ad5504_state *st = iio_priv(indio_dev);
a7b15288	107	unsigned long scale_uv;
59c23eab MH	108	int ret;
59c23eab MH	109
a7b15288	110	switch (m) {
09f4eb40	111	case IIO_CHAN_INFO_RAW:
a7b15288 LPC	112	ret = ad5504_spi_read(st->spi, chan->address);
	113	if (ret < 0)
	114	return ret;
59c23eab	115
a7b15288 LPC	116	*val = ret;
	117
	118	return IIO_VAL_INT;
	119	case IIO_CHAN_INFO_SCALE:
	120	scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
	121	*val = scale_uv / 1000;
	122	val2 = (scale_uv % 1000) 1000;
	123	return IIO_VAL_INT_PLUS_MICRO;
	124
	125	}
	126	return -EINVAL;
59c23eab MH	127	}
59c23eab MH	128
a7b15288 LPC	129	static int ad5504_write_raw(struct iio_dev *indio_dev,
	130	struct iio_chan_spec const *chan,
	131	int val,
	132	int val2,
	133	long mask)
59c23eab	134	{
a3684ded	135	struct ad5504_state *st = iio_priv(indio_dev);
59c23eab	136	int ret;
59c23eab	137
a7b15288	138	switch (mask) {
09f4eb40	139	case IIO_CHAN_INFO_RAW:
a7b15288 LPC	140	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
a7b15288 LPC	141	return -EINVAL;
59c23eab	142
a7b15288 LPC	143	return ad5504_spi_write(st->spi, chan->address, val);
	144	default:
	145	ret = -EINVAL;
	146	}
	147
	148	return -EINVAL;
59c23eab MH	149	}
59c23eab MH	150
8d05d777 LPC	151	static const char * const ad5504_powerdown_modes[] = {
	152	"20kohm_to_gnd",
	153	"three_state",
	154	};
	155
	156	static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
	157	const struct iio_chan_spec *chan)
59c23eab	158	{
a3684ded	159	struct ad5504_state *st = iio_priv(indio_dev);
59c23eab	160
8d05d777	161	return st->pwr_down_mode;
59c23eab MH	162	}
59c23eab MH	163
8d05d777 LPC	164	static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
8d05d777 LPC	165	const struct iio_chan_spec *chan, unsigned int mode)
59c23eab	166	{
a3684ded	167	struct ad5504_state *st = iio_priv(indio_dev);
59c23eab	168
8d05d777	169	st->pwr_down_mode = mode;
59c23eab	170
8d05d777	171	return 0;
59c23eab MH	172	}
59c23eab MH	173
8d05d777 LPC	174	static const struct iio_enum ad5504_powerdown_mode_enum = {
	175	.items = ad5504_powerdown_modes,
	176	.num_items = ARRAY_SIZE(ad5504_powerdown_modes),
	177	.get = ad5504_get_powerdown_mode,
	178	.set = ad5504_set_powerdown_mode,
	179	};
	180
	181	static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
	182	uintptr_t private, const struct iio_chan_spec chan, char buf)
59c23eab	183	{
a3684ded	184	struct ad5504_state *st = iio_priv(indio_dev);
59c23eab MH	185
59c23eab MH	186	return sprintf(buf, "%d\n",
8d05d777	187	!(st->pwr_down_mask & (1 << chan->channel)));
59c23eab MH	188	}
59c23eab MH	189
8d05d777 LPC	190	static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
	191	uintptr_t private, const struct iio_chan_spec chan, const char buf,
	192	size_t len)
59c23eab	193	{
3bbbf150	194	bool pwr_down;
59c23eab	195	int ret;
a3684ded	196	struct ad5504_state *st = iio_priv(indio_dev);
59c23eab	197
3bbbf150	198	ret = strtobool(buf, &pwr_down);
59c23eab MH	199	if (ret)
	200	return ret;
	201
3bbbf150	202	if (pwr_down)
8d05d777	203	st->pwr_down_mask \|= (1 << chan->channel);
59c23eab	204	else
3bbbf150	205	st->pwr_down_mask &= ~(1 << chan->channel);
59c23eab MH	206
	207	ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL,
	208	AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) \|
	209	AD5504_DAC_PWR(st->pwr_down_mask));
	210
	211	/* writes to the CTRL register must be followed by a NOOP */
	212	ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0);
	213
	214	return ret ? ret : len;
	215	}
	216
59c23eab MH	217	static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
	218	static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
	219
	220	static struct attribute *ad5504_ev_attributes[] = {
	221	&iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
	222	&iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
	223	NULL,
	224	};
	225
	226	static struct attribute_group ad5504_ev_attribute_group = {
	227	.attrs = ad5504_ev_attributes,
8e7d9672	228	.name = "events",
59c23eab MH	229	};
59c23eab MH	230
ce298d40	231	static irqreturn_t ad5504_event_handler(int irq, void *private)
59c23eab	232	{
5aa96188	233	iio_push_event(private,
c4b14d99	234	IIO_UNMOD_EVENT_CODE(IIO_TEMP,
ce298d40 JC	235	0,
	236	IIO_EV_TYPE_THRESH,
	237	IIO_EV_DIR_RISING),
	238	iio_get_time_ns());
	239
	240	return IRQ_HANDLED;
59c23eab MH	241	}
59c23eab MH	242
6fe8135f	243	static const struct iio_info ad5504_info = {
a7b15288 LPC	244	.write_raw = ad5504_write_raw,
a7b15288 LPC	245	.read_raw = ad5504_read_raw,
6fe8135f JC	246	.event_attrs = &ad5504_ev_attribute_group,
	247	.driver_module = THIS_MODULE,
	248	};
	249
8d05d777 LPC	250	static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
	251	{
	252	.name = "powerdown",
	253	.read = ad5504_read_dac_powerdown,
	254	.write = ad5504_write_dac_powerdown,
	255	},
	256	IIO_ENUM("powerdown_mode", true, &ad5504_powerdown_mode_enum),
	257	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
	258	{ },
	259	};
	260
	261	#define AD5504_CHANNEL(_chan) { \
	262	.type = IIO_VOLTAGE, \
	263	.indexed = 1, \
	264	.output = 1, \
	265	.channel = (_chan), \
	266	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT \| \
	267	IIO_CHAN_INFO_SCALE_SHARED_BIT, \
	268	.address = AD5504_ADDR_DAC(_chan), \
	269	.scan_type = IIO_ST('u', 12, 16, 0), \
	270	.ext_info = ad5504_ext_info, \
	271	}
	272
	273	static const struct iio_chan_spec ad5504_channels[] = {
	274	AD5504_CHANNEL(0),
	275	AD5504_CHANNEL(1),
	276	AD5504_CHANNEL(2),
	277	AD5504_CHANNEL(3),
6fe8135f JC	278	};
6fe8135f JC	279
59c23eab MH	280	static int __devinit ad5504_probe(struct spi_device *spi)
	281	{
	282	struct ad5504_platform_data *pdata = spi->dev.platform_data;
a3684ded	283	struct iio_dev *indio_dev;
59c23eab	284	struct ad5504_state *st;
a3684ded	285	struct regulator *reg;
59c23eab MH	286	int ret, voltage_uv = 0;
59c23eab MH	287
7cbb7537	288	indio_dev = iio_device_alloc(sizeof(*st));
26d25ae3 JC	289	if (indio_dev == NULL) {
	290	ret = -ENOMEM;
	291	goto error_ret;
	292	}
a3684ded JC	293	reg = regulator_get(&spi->dev, "vcc");
	294	if (!IS_ERR(reg)) {
	295	ret = regulator_enable(reg);
59c23eab MH	296	if (ret)
	297	goto error_put_reg;
	298
a3684ded	299	voltage_uv = regulator_get_voltage(reg);
59c23eab MH	300	}
59c23eab MH	301
a3684ded JC	302	spi_set_drvdata(spi, indio_dev);
a3684ded JC	303	st = iio_priv(indio_dev);
59c23eab MH	304	if (voltage_uv)
	305	st->vref_mv = voltage_uv / 1000;
	306	else if (pdata)
	307	st->vref_mv = pdata->vref_mv;
	308	else
	309	dev_warn(&spi->dev, "reference voltage unspecified\n");
	310
a3684ded	311	st->reg = reg;
59c23eab	312	st->spi = spi;
a3684ded JC	313	indio_dev->dev.parent = &spi->dev;
a3684ded JC	314	indio_dev->name = spi_get_device_id(st->spi)->name;
8d05d777 LPC	315	indio_dev->info = &ad5504_info;
8d05d777 LPC	316	if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
a7b15288	317	indio_dev->num_channels = 1;
8d05d777	318	else
a7b15288	319	indio_dev->num_channels = 4;
a7b15288	320	indio_dev->channels = ad5504_channels;
a3684ded	321	indio_dev->modes = INDIO_DIRECT_MODE;
59c23eab	322
59c23eab	323	if (spi->irq) {
ce298d40 JC	324	ret = request_threaded_irq(spi->irq,
	325	NULL,
	326	&ad5504_event_handler,
	327	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	328	spi_get_device_id(st->spi)->name,
a3684ded	329	indio_dev);
59c23eab	330	if (ret)
26d25ae3	331	goto error_disable_reg;
59c23eab MH	332	}
59c23eab MH	333
26d25ae3 JC	334	ret = iio_device_register(indio_dev);
	335	if (ret)
	336	goto error_free_irq;
	337
59c23eab MH	338	return 0;
59c23eab MH	339
26d25ae3	340	error_free_irq:
4f0a788d LPC	341	if (spi->irq)
4f0a788d LPC	342	free_irq(spi->irq, indio_dev);
59c23eab	343	error_disable_reg:
a3684ded	344	if (!IS_ERR(reg))
0cbb2b53	345	regulator_disable(reg);
59c23eab	346	error_put_reg:
a3684ded JC	347	if (!IS_ERR(reg))
a3684ded JC	348	regulator_put(reg);
59c23eab	349
7cbb7537	350	iio_device_free(indio_dev);
26d25ae3	351	error_ret:
59c23eab MH	352	return ret;
	353	}
	354
	355	static int __devexit ad5504_remove(struct spi_device *spi)
	356	{
a3684ded JC	357	struct iio_dev *indio_dev = spi_get_drvdata(spi);
a3684ded JC	358	struct ad5504_state *st = iio_priv(indio_dev);
26d25ae3	359
d2fffd6c	360	iio_device_unregister(indio_dev);
59c23eab	361	if (spi->irq)
a3684ded	362	free_irq(spi->irq, indio_dev);
59c23eab	363
26d25ae3 JC	364	if (!IS_ERR(st->reg)) {
	365	regulator_disable(st->reg);
	366	regulator_put(st->reg);
59c23eab	367	}
7cbb7537	368	iio_device_free(indio_dev);
26d25ae3	369
59c23eab MH	370	return 0;
	371	}
	372
	373	static const struct spi_device_id ad5504_id[] = {
	374	{"ad5504", ID_AD5504},
	375	{"ad5501", ID_AD5501},
	376	{}
	377	};
55e4390c	378	MODULE_DEVICE_TABLE(spi, ad5504_id);
59c23eab MH	379
	380	static struct spi_driver ad5504_driver = {
	381	.driver = {
	382	.name = "ad5504",
	383	.owner = THIS_MODULE,
	384	},
	385	.probe = ad5504_probe,
	386	.remove = __devexit_p(ad5504_remove),
	387	.id_table = ad5504_id,
	388	};
ae6ae6fe	389	module_spi_driver(ad5504_driver);
59c23eab MH	390
	391	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	392	MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
	393	MODULE_LICENSE("GPL v2");