[mirror_ubuntu-artful-kernel.git] / drivers / iio / dac / ad5686.c

/*
 * AD5686R, AD5685R, AD5684R Digital to analog converters  driver
 *
 * Copyright 2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2.
 */

#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/module.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/iio/iio.h>
#include <linux/iio/sysfs.h>

#define AD5686_DAC_CHANNELS			4

#define AD5686_ADDR(x)				((x) << 16)
#define AD5686_CMD(x)				((x) << 20)

#define AD5686_ADDR_DAC(chan)		(0x1 << (chan))
#define AD5686_ADDR_ALL_DAC			0xF

#define AD5686_CMD_NOOP				0x0
#define AD5686_CMD_WRITE_INPUT_N		0x1
#define AD5686_CMD_UPDATE_DAC_N			0x2
#define AD5686_CMD_WRITE_INPUT_N_UPDATE_N	0x3
#define AD5686_CMD_POWERDOWN_DAC		0x4
#define AD5686_CMD_LDAC_MASK			0x5
#define AD5686_CMD_RESET			0x6
#define AD5686_CMD_INTERNAL_REFER_SETUP		0x7
#define AD5686_CMD_DAISY_CHAIN_ENABLE		0x8
#define AD5686_CMD_READBACK_ENABLE		0x9

#define AD5686_LDAC_PWRDN_NONE			0x0
#define AD5686_LDAC_PWRDN_1K			0x1
#define AD5686_LDAC_PWRDN_100K			0x2
#define AD5686_LDAC_PWRDN_3STATE		0x3

/**
 * struct ad5686_chip_info - chip specific information
 * @int_vref_mv:	AD5620/40/60: the internal reference voltage
 * @channel:		channel specification
*/

struct ad5686_chip_info {
	u16				int_vref_mv;
	struct iio_chan_spec		channel[AD5686_DAC_CHANNELS];
};

/**
 * 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
 * @pwr_down_mask:	power down mask
 * @pwr_down_mode:	current power down mode
 * @data:		spi transfer buffers
 */

struct ad5686_state {
	struct spi_device		*spi;
	const struct ad5686_chip_info	*chip_info;
	struct regulator		*reg;
	unsigned short			vref_mv;
	unsigned			pwr_down_mask;
	unsigned			pwr_down_mode;
	/*
	 * DMA (thus cache coherency maintenance) requires the
	 * transfer buffers to live in their own cache lines.
	 */

	union {
		__be32 d32;
		u8 d8[4];
	} data[3] ____cacheline_aligned;
};

/**
 * ad5686_supported_device_ids:
 */

enum ad5686_supported_device_ids {
	ID_AD5684,
	ID_AD5685,
	ID_AD5686,
};
static int ad5686_spi_write(struct ad5686_state *st,
			     u8 cmd, u8 addr, u16 val, u8 shift)
{
	val <<= shift;

	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
			      AD5686_ADDR(addr) |
			      val);

	return spi_write(st->spi, &st->data[0].d8[1], 3);
}

static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
{
	struct spi_transfer t[] = {
		{
			.tx_buf = &st->data[0].d8[1],
			.len = 3,
			.cs_change = 1,
		}, {
			.tx_buf = &st->data[1].d8[1],
			.rx_buf = &st->data[2].d8[1],
			.len = 3,
		},
	};
	int ret;

	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) |
			      AD5686_ADDR(addr));
	st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));

	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
	if (ret < 0)
		return ret;

	return be32_to_cpu(st->data[2].d32);
}

static const char * const ad5686_powerdown_modes[] = {
	"1kohm_to_gnd",
	"100kohm_to_gnd",
	"three_state"
};

static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5686_state *st = iio_priv(indio_dev);

	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
}

static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5686_state *st = iio_priv(indio_dev);

	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
	st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));

	return 0;
}

static const struct iio_enum ad5686_powerdown_mode_enum = {
	.items = ad5686_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),
	.get = ad5686_get_powerdown_mode,
	.set = ad5686_set_powerdown_mode,
};

static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct ad5686_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
			(0x3 << (chan->channel * 2))));
}

static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
	 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
	 size_t len)
{
	bool readin;
	int ret;
	struct ad5686_state *st = iio_priv(indio_dev);

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

	if (readin)
		st->pwr_down_mask |= (0x3 << (chan->channel * 2));
	else
		st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));

	ret = ad5686_spi_write(st, AD5686_CMD_POWERDOWN_DAC, 0,
			       st->pwr_down_mask & st->pwr_down_mode, 0);

	return ret ? ret : len;
}

static int ad5686_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5686_state *st = iio_priv(indio_dev);
	int ret;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&indio_dev->mlock);
		ret = ad5686_spi_read(st, chan->address);
		mutex_unlock(&indio_dev->mlock);
		if (ret < 0)
			return ret;
		*val = ret;
		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 ad5686_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct ad5686_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;

		mutex_lock(&indio_dev->mlock);
		ret = ad5686_spi_write(st,
				 AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
				 chan->address,
				 val,
				 chan->scan_type.shift);
		mutex_unlock(&indio_dev->mlock);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static const struct iio_info ad5686_info = {
	.read_raw = ad5686_read_raw,
	.write_raw = ad5686_write_raw,
	.driver_module = THIS_MODULE,
};

static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
	{
		.name = "powerdown",
		.read = ad5686_read_dac_powerdown,
		.write = ad5686_write_dac_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
	{ },
};

#define AD5868_CHANNEL(chan, bits, _shift) {			\
		.type = IIO_VOLTAGE,				\
		.indexed = 1,					\
		.output = 1,					\
		.channel = chan,				\
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
		.address = AD5686_ADDR_DAC(chan),		\
		.scan_type = {					\
			.sign = 'u',				\
			.realbits = (bits),			\
			.storagebits = 16,			\
			.shift = (_shift),			\
		},						\
		.ext_info = ad5686_ext_info,			\
}

static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
	[ID_AD5684] = {
		.channel[0] = AD5868_CHANNEL(0, 12, 4),
		.channel[1] = AD5868_CHANNEL(1, 12, 4),
		.channel[2] = AD5868_CHANNEL(2, 12, 4),
		.channel[3] = AD5868_CHANNEL(3, 12, 4),
		.int_vref_mv = 2500,
	},
	[ID_AD5685] = {
		.channel[0] = AD5868_CHANNEL(0, 14, 2),
		.channel[1] = AD5868_CHANNEL(1, 14, 2),
		.channel[2] = AD5868_CHANNEL(2, 14, 2),
		.channel[3] = AD5868_CHANNEL(3, 14, 2),
		.int_vref_mv = 2500,
	},
	[ID_AD5686] = {
		.channel[0] = AD5868_CHANNEL(0, 16, 0),
		.channel[1] = AD5868_CHANNEL(1, 16, 0),
		.channel[2] = AD5868_CHANNEL(2, 16, 0),
		.channel[3] = AD5868_CHANNEL(3, 16, 0),
		.int_vref_mv = 2500,
	},
};


static int ad5686_probe(struct spi_device *spi)
{
	struct ad5686_state *st;
	struct iio_dev *indio_dev;
	int ret, voltage_uv = 0;

	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	if (indio_dev == NULL)
		return  -ENOMEM;

	st = iio_priv(indio_dev);
	spi_set_drvdata(spi, indio_dev);

	st->reg = devm_regulator_get(&spi->dev, "vcc");
	if (!IS_ERR(st->reg)) {
		ret = regulator_enable(st->reg);
		if (ret)
			return ret;

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

		voltage_uv = ret;
	}

	st->chip_info =
		&ad5686_chip_info_tbl[spi_get_device_id(spi)->driver_data];

	if (voltage_uv)
		st->vref_mv = voltage_uv / 1000;
	else
		st->vref_mv = st->chip_info->int_vref_mv;

	st->spi = spi;

	/* Set all the power down mode for all channels to 1K pulldown */
	st->pwr_down_mode = 0x55;

	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = spi_get_device_id(spi)->name;
	indio_dev->info = &ad5686_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = st->chip_info->channel;
	indio_dev->num_channels = AD5686_DAC_CHANNELS;

	ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
				!!voltage_uv, 0);
	if (ret)
		goto error_disable_reg;

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

	return 0;

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

static int ad5686_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5686_state *st = iio_priv(indio_dev);

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

	return 0;
}

static const struct spi_device_id ad5686_id[] = {
	{"ad5684", ID_AD5684},
	{"ad5685", ID_AD5685},
	{"ad5686", ID_AD5686},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5686_id);

static struct spi_driver ad5686_driver = {
	.driver = {
		   .name = "ad5686",
		   .owner = THIS_MODULE,
		   },
	.probe = ad5686_probe,
	.remove = ad5686_remove,
	.id_table = ad5686_id,
};
module_spi_driver(ad5686_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
c2f37c8d MH	1	/*
	2	* AD5686R, AD5685R, AD5684R Digital to analog converters driver
	3	*
	4	* Copyright 2011 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2.
	7	*/
	8
	9	#include <linux/interrupt.h>
c2f37c8d MH	10	#include <linux/fs.h>
c2f37c8d MH	11	#include <linux/device.h>
99c97852	12	#include <linux/module.h>
c2f37c8d MH	13	#include <linux/kernel.h>
	14	#include <linux/spi/spi.h>
	15	#include <linux/slab.h>
	16	#include <linux/sysfs.h>
	17	#include <linux/regulator/consumer.h>
	18
06458e27 JC	19	#include <linux/iio/iio.h>
06458e27 JC	20	#include <linux/iio/sysfs.h>
c2f37c8d MH	21
	22	#define AD5686_DAC_CHANNELS 4
	23
	24	#define AD5686_ADDR(x) ((x) << 16)
	25	#define AD5686_CMD(x) ((x) << 20)
	26
a45186c0	27	#define AD5686_ADDR_DAC(chan) (0x1 << (chan))
c2f37c8d MH	28	#define AD5686_ADDR_ALL_DAC 0xF
	29
	30	#define AD5686_CMD_NOOP 0x0
	31	#define AD5686_CMD_WRITE_INPUT_N 0x1
	32	#define AD5686_CMD_UPDATE_DAC_N 0x2
	33	#define AD5686_CMD_WRITE_INPUT_N_UPDATE_N 0x3
	34	#define AD5686_CMD_POWERDOWN_DAC 0x4
	35	#define AD5686_CMD_LDAC_MASK 0x5
	36	#define AD5686_CMD_RESET 0x6
	37	#define AD5686_CMD_INTERNAL_REFER_SETUP 0x7
	38	#define AD5686_CMD_DAISY_CHAIN_ENABLE 0x8
	39	#define AD5686_CMD_READBACK_ENABLE 0x9
	40
	41	#define AD5686_LDAC_PWRDN_NONE 0x0
	42	#define AD5686_LDAC_PWRDN_1K 0x1
	43	#define AD5686_LDAC_PWRDN_100K 0x2
	44	#define AD5686_LDAC_PWRDN_3STATE 0x3
	45
	46	/**
	47	* struct ad5686_chip_info - chip specific information
	48	* @int_vref_mv: AD5620/40/60: the internal reference voltage
	49	* @channel: channel specification
	50	*/
	51
	52	struct ad5686_chip_info {
	53	u16 int_vref_mv;
	54	struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
	55	};
	56
	57	/**
	58	* struct ad5446_state - driver instance specific data
	59	* @spi: spi_device
	60	* @chip_info: chip model specific constants, available modes etc
	61	* @reg: supply regulator
	62	* @vref_mv: actual reference voltage used
	63	* @pwr_down_mask: power down mask
	64	* @pwr_down_mode: current power down mode
	65	* @data: spi transfer buffers
	66	*/
	67
	68	struct ad5686_state {
	69	struct spi_device *spi;
	70	const struct ad5686_chip_info *chip_info;
	71	struct regulator *reg;
	72	unsigned short vref_mv;
	73	unsigned pwr_down_mask;
	74	unsigned pwr_down_mode;
	75	/*
	76	* DMA (thus cache coherency maintenance) requires the
	77	* transfer buffers to live in their own cache lines.
	78	*/
	79
	80	union {
cf87534b	81	__be32 d32;
c2f37c8d MH	82	u8 d8[4];
	83	} data[3] ____cacheline_aligned;
	84	};
	85
	86	/**
	87	* ad5686_supported_device_ids:
	88	*/
	89
	90	enum ad5686_supported_device_ids {
	91	ID_AD5684,
	92	ID_AD5685,
	93	ID_AD5686,
	94	};
c2f37c8d MH	95	static int ad5686_spi_write(struct ad5686_state *st,
	96	u8 cmd, u8 addr, u16 val, u8 shift)
	97	{
	98	val <<= shift;
	99
	100	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) \|
	101	AD5686_ADDR(addr) \|
	102	val);
	103
	104	return spi_write(st->spi, &st->data[0].d8[1], 3);
	105	}
	106
	107	static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
	108	{
	109	struct spi_transfer t[] = {
	110	{
	111	.tx_buf = &st->data[0].d8[1],
	112	.len = 3,
	113	.cs_change = 1,
	114	}, {
	115	.tx_buf = &st->data[1].d8[1],
	116	.rx_buf = &st->data[2].d8[1],
	117	.len = 3,
	118	},
	119	};
c2f37c8d MH	120	int ret;
c2f37c8d MH	121
c2f37c8d MH	122	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) \|
	123	AD5686_ADDR(addr));
	124	st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
	125
14543a00	126	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
c2f37c8d MH	127	if (ret < 0)
	128	return ret;
	129
	130	return be32_to_cpu(st->data[2].d32);
	131	}
	132
fe4586a8 LPC	133	static const char * const ad5686_powerdown_modes[] = {
	134	"1kohm_to_gnd",
	135	"100kohm_to_gnd",
	136	"three_state"
	137	};
	138
	139	static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
	140	const struct iio_chan_spec *chan)
c2f37c8d	141	{
c2f37c8d	142	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d	143
fe4586a8	144	return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
c2f37c8d MH	145	}
c2f37c8d MH	146
fe4586a8 LPC	147	static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
fe4586a8 LPC	148	const struct iio_chan_spec *chan, unsigned int mode)
c2f37c8d	149	{
c2f37c8d	150	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d	151
fe4586a8 LPC	152	st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
fe4586a8 LPC	153	st->pwr_down_mode \|= ((mode + 1) << (chan->channel * 2));
c2f37c8d	154
fe4586a8	155	return 0;
c2f37c8d MH	156	}
c2f37c8d MH	157
fe4586a8 LPC	158	static const struct iio_enum ad5686_powerdown_mode_enum = {
	159	.items = ad5686_powerdown_modes,
	160	.num_items = ARRAY_SIZE(ad5686_powerdown_modes),
	161	.get = ad5686_get_powerdown_mode,
	162	.set = ad5686_set_powerdown_mode,
	163	};
	164
	165	static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
	166	uintptr_t private, const struct iio_chan_spec chan, char buf)
c2f37c8d	167	{
c2f37c8d	168	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d MH	169
c2f37c8d MH	170	return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
fe4586a8	171	(0x3 << (chan->channel * 2))));
c2f37c8d MH	172	}
c2f37c8d MH	173
fe4586a8 LPC	174	static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
	175	uintptr_t private, const struct iio_chan_spec chan, const char buf,
	176	size_t len)
c2f37c8d MH	177	{
	178	bool readin;
	179	int ret;
c2f37c8d	180	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d MH	181
	182	ret = strtobool(buf, &readin);
	183	if (ret)
	184	return ret;
	185
7737fa6d	186	if (readin)
fe4586a8	187	st->pwr_down_mask \|= (0x3 << (chan->channel * 2));
c2f37c8d	188	else
fe4586a8	189	st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
c2f37c8d MH	190
	191	ret = ad5686_spi_write(st, AD5686_CMD_POWERDOWN_DAC, 0,
	192	st->pwr_down_mask & st->pwr_down_mode, 0);
	193
	194	return ret ? ret : len;
	195	}
	196
c2f37c8d MH	197	static int ad5686_read_raw(struct iio_dev *indio_dev,
	198	struct iio_chan_spec const *chan,
	199	int *val,
	200	int *val2,
	201	long m)
	202	{
	203	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d MH	204	int ret;
	205
	206	switch (m) {
09f4eb40	207	case IIO_CHAN_INFO_RAW:
c2f37c8d MH	208	mutex_lock(&indio_dev->mlock);
	209	ret = ad5686_spi_read(st, chan->address);
	210	mutex_unlock(&indio_dev->mlock);
	211	if (ret < 0)
	212	return ret;
	213	*val = ret;
	214	return IIO_VAL_INT;
c8a9f805	215	case IIO_CHAN_INFO_SCALE:
ecc7e948 LPC	216	*val = st->vref_mv;
	217	*val2 = chan->scan_type.realbits;
	218	return IIO_VAL_FRACTIONAL_LOG2;
c2f37c8d MH	219	}
	220	return -EINVAL;
	221	}
	222
	223	static int ad5686_write_raw(struct iio_dev *indio_dev,
	224	struct iio_chan_spec const *chan,
	225	int val,
	226	int val2,
	227	long mask)
	228	{
	229	struct ad5686_state *st = iio_priv(indio_dev);
	230	int ret;
	231
	232	switch (mask) {
09f4eb40	233	case IIO_CHAN_INFO_RAW:
cd8eca6f	234	if (val > (1 << chan->scan_type.realbits) \|\| val < 0)
c2f37c8d MH	235	return -EINVAL;
	236
	237	mutex_lock(&indio_dev->mlock);
	238	ret = ad5686_spi_write(st,
	239	AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
	240	chan->address,
	241	val,
	242	chan->scan_type.shift);
	243	mutex_unlock(&indio_dev->mlock);
	244	break;
	245	default:
	246	ret = -EINVAL;
	247	}
	248
	249	return ret;
	250	}
	251
	252	static const struct iio_info ad5686_info = {
	253	.read_raw = ad5686_read_raw,
	254	.write_raw = ad5686_write_raw,
c2f37c8d MH	255	.driver_module = THIS_MODULE,
	256	};
	257
fe4586a8 LPC	258	static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
	259	{
	260	.name = "powerdown",
	261	.read = ad5686_read_dac_powerdown,
	262	.write = ad5686_write_dac_powerdown,
3704432f	263	.shared = IIO_SEPARATE,
fe4586a8	264	},
3704432f	265	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
fe4586a8 LPC	266	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
	267	{ },
	268	};
	269
44ba1593	270	#define AD5868_CHANNEL(chan, bits, _shift) { \
fe4586a8 LPC	271	.type = IIO_VOLTAGE, \
	272	.indexed = 1, \
	273	.output = 1, \
	274	.channel = chan, \
d87a1d78 JC	275	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	276	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
	277	.address = AD5686_ADDR_DAC(chan), \
44ba1593 JC	278	.scan_type = { \
	279	.sign = 'u', \
	280	.realbits = (bits), \
	281	.storagebits = 16, \
	282	.shift = (_shift), \
	283	}, \
fe4586a8 LPC	284	.ext_info = ad5686_ext_info, \
	285	}
	286
	287	static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
	288	[ID_AD5684] = {
	289	.channel[0] = AD5868_CHANNEL(0, 12, 4),
	290	.channel[1] = AD5868_CHANNEL(1, 12, 4),
	291	.channel[2] = AD5868_CHANNEL(2, 12, 4),
	292	.channel[3] = AD5868_CHANNEL(3, 12, 4),
	293	.int_vref_mv = 2500,
	294	},
	295	[ID_AD5685] = {
	296	.channel[0] = AD5868_CHANNEL(0, 14, 2),
	297	.channel[1] = AD5868_CHANNEL(1, 14, 2),
	298	.channel[2] = AD5868_CHANNEL(2, 14, 2),
	299	.channel[3] = AD5868_CHANNEL(3, 14, 2),
	300	.int_vref_mv = 2500,
	301	},
	302	[ID_AD5686] = {
	303	.channel[0] = AD5868_CHANNEL(0, 16, 0),
	304	.channel[1] = AD5868_CHANNEL(1, 16, 0),
	305	.channel[2] = AD5868_CHANNEL(2, 16, 0),
	306	.channel[3] = AD5868_CHANNEL(3, 16, 0),
	307	.int_vref_mv = 2500,
	308	},
	309	};
	310
	311
fc52692c	312	static int ad5686_probe(struct spi_device *spi)
c2f37c8d MH	313	{
	314	struct ad5686_state *st;
	315	struct iio_dev *indio_dev;
10215d86	316	int ret, voltage_uv = 0;
c2f37c8d	317
edf3fd41	318	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
c2f37c8d MH	319	if (indio_dev == NULL)
	320	return -ENOMEM;
	321
	322	st = iio_priv(indio_dev);
	323	spi_set_drvdata(spi, indio_dev);
	324
edf3fd41	325	st->reg = devm_regulator_get(&spi->dev, "vcc");
c2f37c8d MH	326	if (!IS_ERR(st->reg)) {
	327	ret = regulator_enable(st->reg);
	328	if (ret)
edf3fd41	329	return ret;
c2f37c8d	330
359570ad AL	331	ret = regulator_get_voltage(st->reg);
	332	if (ret < 0)
	333	goto error_disable_reg;
	334
	335	voltage_uv = ret;
c2f37c8d MH	336	}
	337
	338	st->chip_info =
	339	&ad5686_chip_info_tbl[spi_get_device_id(spi)->driver_data];
	340
	341	if (voltage_uv)
	342	st->vref_mv = voltage_uv / 1000;
	343	else
	344	st->vref_mv = st->chip_info->int_vref_mv;
	345
	346	st->spi = spi;
	347
fe4586a8 LPC	348	/* Set all the power down mode for all channels to 1K pulldown */
	349	st->pwr_down_mode = 0x55;
	350
c2f37c8d MH	351	indio_dev->dev.parent = &spi->dev;
	352	indio_dev->name = spi_get_device_id(spi)->name;
	353	indio_dev->info = &ad5686_info;
	354	indio_dev->modes = INDIO_DIRECT_MODE;
	355	indio_dev->channels = st->chip_info->channel;
	356	indio_dev->num_channels = AD5686_DAC_CHANNELS;
	357
c2f37c8d MH	358	ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
	359	!!voltage_uv, 0);
	360	if (ret)
	361	goto error_disable_reg;
	362
26d25ae3 JC	363	ret = iio_device_register(indio_dev);
	364	if (ret)
	365	goto error_disable_reg;
	366
c2f37c8d MH	367	return 0;
	368
	369	error_disable_reg:
	370	if (!IS_ERR(st->reg))
	371	regulator_disable(st->reg);
c2f37c8d MH	372	return ret;
	373	}
	374
fc52692c	375	static int ad5686_remove(struct spi_device *spi)
c2f37c8d MH	376	{
	377	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	378	struct ad5686_state *st = iio_priv(indio_dev);
c2f37c8d	379
d2fffd6c	380	iio_device_unregister(indio_dev);
edf3fd41	381	if (!IS_ERR(st->reg))
26a54797	382	regulator_disable(st->reg);
c2f37c8d MH	383
	384	return 0;
	385	}
	386
	387	static const struct spi_device_id ad5686_id[] = {
	388	{"ad5684", ID_AD5684},
	389	{"ad5685", ID_AD5685},
	390	{"ad5686", ID_AD5686},
	391	{}
	392	};
55e4390c	393	MODULE_DEVICE_TABLE(spi, ad5686_id);
c2f37c8d MH	394
	395	static struct spi_driver ad5686_driver = {
	396	.driver = {
	397	.name = "ad5686",
	398	.owner = THIS_MODULE,
	399	},
	400	.probe = ad5686_probe,
fc52692c	401	.remove = ad5686_remove,
c2f37c8d MH	402	.id_table = ad5686_id,
c2f37c8d MH	403	};
ae6ae6fe	404	module_spi_driver(ad5686_driver);
c2f37c8d MH	405
	406	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	407	MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
	408	MODULE_LICENSE("GPL v2");