[deliverable/linux.git] / drivers / iio / dac / ad5791.c

/*
 * AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output 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/dac/ad5791.h>

#define AD5791_RES_MASK(x)		((1 << (x)) - 1)
#define AD5791_DAC_MASK			AD5791_RES_MASK(20)
#define AD5791_DAC_MSB			(1 << 19)

#define AD5791_CMD_READ			(1 << 23)
#define AD5791_CMD_WRITE		(0 << 23)
#define AD5791_ADDR(addr)		((addr) << 20)

/* Registers */
#define AD5791_ADDR_NOOP		0
#define AD5791_ADDR_DAC0		1
#define AD5791_ADDR_CTRL		2
#define AD5791_ADDR_CLRCODE		3
#define AD5791_ADDR_SW_CTRL		4

/* Control Register */
#define AD5791_CTRL_RBUF		(1 << 1)
#define AD5791_CTRL_OPGND		(1 << 2)
#define AD5791_CTRL_DACTRI		(1 << 3)
#define AD5791_CTRL_BIN2SC		(1 << 4)
#define AD5791_CTRL_SDODIS		(1 << 5)
#define AD5761_CTRL_LINCOMP(x)		((x) << 6)

#define AD5791_LINCOMP_0_10		0
#define AD5791_LINCOMP_10_12		1
#define AD5791_LINCOMP_12_16		2
#define AD5791_LINCOMP_16_19		3
#define AD5791_LINCOMP_19_20		12

#define AD5780_LINCOMP_0_10		0
#define AD5780_LINCOMP_10_20		12

/* Software Control Register */
#define AD5791_SWCTRL_LDAC		(1 << 0)
#define AD5791_SWCTRL_CLR		(1 << 1)
#define AD5791_SWCTRL_RESET		(1 << 2)

#define AD5791_DAC_PWRDN_6K		0
#define AD5791_DAC_PWRDN_3STATE		1

/**
 * struct ad5791_chip_info - chip specific information
 * @get_lin_comp:	function pointer to the device specific function
 */

struct ad5791_chip_info {
	int (*get_lin_comp)	(unsigned int span);
};

/**
 * struct ad5791_state - driver instance specific data
 * @us:			spi_device
 * @reg_vdd:		positive supply regulator
 * @reg_vss:		negative supply regulator
 * @chip_info:		chip model specific constants
 * @vref_mv:		actual reference voltage used
 * @vref_neg_mv:	voltage of the negative supply
 * @pwr_down_mode	current power down mode
 */

struct ad5791_state {
	struct spi_device		*spi;
	struct regulator		*reg_vdd;
	struct regulator		*reg_vss;
	const struct ad5791_chip_info	*chip_info;
	unsigned short			vref_mv;
	unsigned int			vref_neg_mv;
	unsigned			ctrl;
	unsigned			pwr_down_mode;
	bool				pwr_down;
};

/**
 * ad5791_supported_device_ids:
 */

enum ad5791_supported_device_ids {
	ID_AD5760,
	ID_AD5780,
	ID_AD5781,
	ID_AD5791,
};

static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
{
	union {
		u32 d32;
		u8 d8[4];
	} data;

	data.d32 = cpu_to_be32(AD5791_CMD_WRITE |
			      AD5791_ADDR(addr) |
			      (val & AD5791_DAC_MASK));

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

static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
{
	union {
		u32 d32;
		u8 d8[4];
	} data[3];
	int ret;
	struct spi_message msg;
	struct spi_transfer xfers[] = {
		{
			.tx_buf = &data[0].d8[1],
			.bits_per_word = 8,
			.len = 3,
			.cs_change = 1,
		}, {
			.tx_buf = &data[1].d8[1],
			.rx_buf = &data[2].d8[1],
			.bits_per_word = 8,
			.len = 3,
		},
	};

	data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
			      AD5791_ADDR(addr));
	data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));

	spi_message_init(&msg);
	spi_message_add_tail(&xfers[0], &msg);
	spi_message_add_tail(&xfers[1], &msg);
	ret = spi_sync(spi, &msg);

	*val = be32_to_cpu(data[2].d32);

	return ret;
}

static const char * const ad5791_powerdown_modes[] = {
	"6kohm_to_gnd",
	"three_state",
};

static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5791_state *st = iio_priv(indio_dev);

	return st->pwr_down_mode;
}

static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5791_state *st = iio_priv(indio_dev);

	st->pwr_down_mode = mode;

	return 0;
}

static const struct iio_enum ad5791_powerdown_mode_enum = {
	.items = ad5791_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5791_powerdown_modes),
	.get = ad5791_get_powerdown_mode,
	.set = ad5791_set_powerdown_mode,
};

static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct ad5791_state *st = iio_priv(indio_dev);

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

static ssize_t ad5791_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 ad5791_state *st = iio_priv(indio_dev);

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

	if (!pwr_down) {
		st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
	} else {
		if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
			st->ctrl |= AD5791_CTRL_OPGND;
		else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
			st->ctrl |= AD5791_CTRL_DACTRI;
	}
	st->pwr_down = pwr_down;

	ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);

	return ret ? ret : len;
}

static int ad5791_get_lin_comp(unsigned int span)
{
	if (span <= 10000)
		return AD5791_LINCOMP_0_10;
	else if (span <= 12000)
		return AD5791_LINCOMP_10_12;
	else if (span <= 16000)
		return AD5791_LINCOMP_12_16;
	else if (span <= 19000)
		return AD5791_LINCOMP_16_19;
	else
		return AD5791_LINCOMP_19_20;
}

static int ad5780_get_lin_comp(unsigned int span)
{
	if (span <= 10000)
		return AD5780_LINCOMP_0_10;
	else
		return AD5780_LINCOMP_10_20;
}
static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
	[ID_AD5760] = {
		.get_lin_comp = ad5780_get_lin_comp,
	},
	[ID_AD5780] = {
		.get_lin_comp = ad5780_get_lin_comp,
	},
	[ID_AD5781] = {
		.get_lin_comp = ad5791_get_lin_comp,
	},
	[ID_AD5791] = {
		.get_lin_comp = ad5791_get_lin_comp,
	},
};

static int ad5791_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5791_state *st = iio_priv(indio_dev);
	u64 val64;
	int ret;

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		ret = ad5791_spi_read(st->spi, chan->address, val);
		if (ret)
			return ret;
		*val &= AD5791_DAC_MASK;
		*val >>= chan->scan_type.shift;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits;
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_OFFSET:
		val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
		do_div(val64, st->vref_mv);
		*val = -val64;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}

};

static const struct iio_chan_spec_ext_info ad5791_ext_info[] = {
	{
		.name = "powerdown",
		.shared = true,
		.read = ad5791_read_dac_powerdown,
		.write = ad5791_write_dac_powerdown,
	},
	IIO_ENUM("powerdown_mode", true, &ad5791_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum),
	{ },
};

#define AD5791_CHAN(bits, shift) {			\
	.type = IIO_VOLTAGE,				\
	.output = 1,					\
	.indexed = 1,					\
	.address = AD5791_ADDR_DAC0,			\
	.channel = 0,					\
	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |	\
		IIO_CHAN_INFO_SCALE_SHARED_BIT |	\
		IIO_CHAN_INFO_OFFSET_SHARED_BIT,	\
	.scan_type = IIO_ST('u', bits, 24, shift),	\
	.ext_info = ad5791_ext_info,			\
}

static const struct iio_chan_spec ad5791_channels[] = {
	[ID_AD5760] = AD5791_CHAN(16, 4),
	[ID_AD5780] = AD5791_CHAN(18, 2),
	[ID_AD5781] = AD5791_CHAN(18, 2),
	[ID_AD5791] = AD5791_CHAN(20, 0)
};

static int ad5791_write_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int val,
			    int val2,
			    long mask)
{
	struct ad5791_state *st = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		val &= AD5791_RES_MASK(chan->scan_type.realbits);
		val <<= chan->scan_type.shift;

		return ad5791_spi_write(st->spi, chan->address, val);

	default:
		return -EINVAL;
	}
}

static const struct iio_info ad5791_info = {
	.read_raw = &ad5791_read_raw,
	.write_raw = &ad5791_write_raw,
	.driver_module = THIS_MODULE,
};

static int ad5791_probe(struct spi_device *spi)
{
	struct ad5791_platform_data *pdata = spi->dev.platform_data;
	struct iio_dev *indio_dev;
	struct ad5791_state *st;
	int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;

	indio_dev = iio_device_alloc(sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
	}
	st = iio_priv(indio_dev);
	st->reg_vdd = regulator_get(&spi->dev, "vdd");
	if (!IS_ERR(st->reg_vdd)) {
		ret = regulator_enable(st->reg_vdd);
		if (ret)
			goto error_put_reg_pos;

		ret = regulator_get_voltage(st->reg_vdd);
		if (ret < 0)
			goto error_disable_reg_pos;

		pos_voltage_uv = ret;
	}

	st->reg_vss = regulator_get(&spi->dev, "vss");
	if (!IS_ERR(st->reg_vss)) {
		ret = regulator_enable(st->reg_vss);
		if (ret)
			goto error_put_reg_neg;

		ret = regulator_get_voltage(st->reg_vss);
		if (ret < 0)
			goto error_disable_reg_neg;

		neg_voltage_uv = ret;
	}

	st->pwr_down = true;
	st->spi = spi;

	if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
		st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
		st->vref_neg_mv = neg_voltage_uv / 1000;
	} else if (pdata) {
		st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
		st->vref_neg_mv = pdata->vref_neg_mv;
	} else {
		dev_warn(&spi->dev, "reference voltage unspecified\n");
	}

	ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
	if (ret)
		goto error_disable_reg_neg;

	st->chip_info =	&ad5791_chip_info_tbl[spi_get_device_id(spi)
					      ->driver_data];


	st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
		  | ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
		  AD5791_CTRL_BIN2SC;

	ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
		AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
	if (ret)
		goto error_disable_reg_neg;

	spi_set_drvdata(spi, indio_dev);
	indio_dev->dev.parent = &spi->dev;
	indio_dev->info = &ad5791_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels
		= &ad5791_channels[spi_get_device_id(spi)->driver_data];
	indio_dev->num_channels = 1;
	indio_dev->name = spi_get_device_id(st->spi)->name;
	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_disable_reg_neg;

	return 0;

error_disable_reg_neg:
	if (!IS_ERR(st->reg_vss))
		regulator_disable(st->reg_vss);
error_put_reg_neg:
	if (!IS_ERR(st->reg_vss))
		regulator_put(st->reg_vss);

error_disable_reg_pos:
	if (!IS_ERR(st->reg_vdd))
		regulator_disable(st->reg_vdd);
error_put_reg_pos:
	if (!IS_ERR(st->reg_vdd))
		regulator_put(st->reg_vdd);
	iio_device_free(indio_dev);
error_ret:

	return ret;
}

static int ad5791_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5791_state *st = iio_priv(indio_dev);

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

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

	return 0;
}

static const struct spi_device_id ad5791_id[] = {
	{"ad5760", ID_AD5760},
	{"ad5780", ID_AD5780},
	{"ad5781", ID_AD5781},
	{"ad5790", ID_AD5791},
	{"ad5791", ID_AD5791},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5791_id);

static struct spi_driver ad5791_driver = {
	.driver = {
		   .name = "ad5791",
		   .owner = THIS_MODULE,
		   },
	.probe = ad5791_probe,
	.remove = ad5791_remove,
	.id_table = ad5791_id,
};
module_spi_driver(ad5791_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
69d900a6	1	/*
9d41c5bb LPC	2	* AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog
9d41c5bb LPC	3	* Converter
69d900a6 MH	4	*
	5	* Copyright 2011 Analog Devices Inc.
	6	*
	7	* Licensed under the GPL-2.
	8	*/
	9
	10	#include <linux/interrupt.h>
69d900a6 MH	11	#include <linux/fs.h>
	12	#include <linux/device.h>
	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>
99c97852	18	#include <linux/module.h>
69d900a6	19
06458e27 JC	20	#include <linux/iio/iio.h>
06458e27 JC	21	#include <linux/iio/sysfs.h>
dbdc025b	22	#include <linux/iio/dac/ad5791.h>
69d900a6	23
20374d1a LPC	24	#define AD5791_RES_MASK(x) ((1 << (x)) - 1)
	25	#define AD5791_DAC_MASK AD5791_RES_MASK(20)
	26	#define AD5791_DAC_MSB (1 << 19)
	27
	28	#define AD5791_CMD_READ (1 << 23)
	29	#define AD5791_CMD_WRITE (0 << 23)
	30	#define AD5791_ADDR(addr) ((addr) << 20)
	31
	32	/* Registers */
	33	#define AD5791_ADDR_NOOP 0
	34	#define AD5791_ADDR_DAC0 1
	35	#define AD5791_ADDR_CTRL 2
	36	#define AD5791_ADDR_CLRCODE 3
	37	#define AD5791_ADDR_SW_CTRL 4
	38
	39	/* Control Register */
	40	#define AD5791_CTRL_RBUF (1 << 1)
	41	#define AD5791_CTRL_OPGND (1 << 2)
	42	#define AD5791_CTRL_DACTRI (1 << 3)
	43	#define AD5791_CTRL_BIN2SC (1 << 4)
	44	#define AD5791_CTRL_SDODIS (1 << 5)
	45	#define AD5761_CTRL_LINCOMP(x) ((x) << 6)
	46
	47	#define AD5791_LINCOMP_0_10 0
	48	#define AD5791_LINCOMP_10_12 1
	49	#define AD5791_LINCOMP_12_16 2
	50	#define AD5791_LINCOMP_16_19 3
	51	#define AD5791_LINCOMP_19_20 12
	52
	53	#define AD5780_LINCOMP_0_10 0
	54	#define AD5780_LINCOMP_10_20 12
	55
	56	/* Software Control Register */
	57	#define AD5791_SWCTRL_LDAC (1 << 0)
	58	#define AD5791_SWCTRL_CLR (1 << 1)
	59	#define AD5791_SWCTRL_RESET (1 << 2)
	60
	61	#define AD5791_DAC_PWRDN_6K 0
	62	#define AD5791_DAC_PWRDN_3STATE 1
	63
	64	/**
	65	* struct ad5791_chip_info - chip specific information
	66	* @get_lin_comp: function pointer to the device specific function
	67	*/
	68
	69	struct ad5791_chip_info {
	70	int (*get_lin_comp) (unsigned int span);
	71	};
	72
	73	/**
	74	* struct ad5791_state - driver instance specific data
	75	* @us: spi_device
	76	* @reg_vdd: positive supply regulator
	77	* @reg_vss: negative supply regulator
	78	* @chip_info: chip model specific constants
	79	* @vref_mv: actual reference voltage used
	80	* @vref_neg_mv: voltage of the negative supply
	81	* @pwr_down_mode current power down mode
	82	*/
	83
	84	struct ad5791_state {
	85	struct spi_device *spi;
	86	struct regulator *reg_vdd;
	87	struct regulator *reg_vss;
88	const struct ad5791_chip_info *chip_info;
89	unsigned short vref_mv;
90	unsigned int vref_neg_mv;
91	unsigned ctrl;
92	unsigned pwr_down_mode;
93	bool pwr_down;
94	};
95
96	/**
97	* ad5791_supported_device_ids:
98	*/
99
100	enum ad5791_supported_device_ids {
101	ID_AD5760,
102	ID_AD5780,
103	ID_AD5781,
104	ID_AD5791,
105	};
106
69d900a6 MH	107	static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
	108	{
	109	union {
	110	u32 d32;
	111	u8 d8[4];
	112	} data;
	113
	114	data.d32 = cpu_to_be32(AD5791_CMD_WRITE \|
	115	AD5791_ADDR(addr) \|
	116	(val & AD5791_DAC_MASK));
	117
	118	return spi_write(spi, &data.d8[1], 3);
	119	}
	120
	121	static int ad5791_spi_read(struct spi_device spi, u8 addr, u32 val)
	122	{
	123	union {
	124	u32 d32;
	125	u8 d8[4];
	126	} data[3];
	127	int ret;
	128	struct spi_message msg;
	129	struct spi_transfer xfers[] = {
	130	{
	131	.tx_buf = &data[0].d8[1],
	132	.bits_per_word = 8,
	133	.len = 3,
	134	.cs_change = 1,
	135	}, {
	136	.tx_buf = &data[1].d8[1],
	137	.rx_buf = &data[2].d8[1],
	138	.bits_per_word = 8,
	139	.len = 3,
	140	},
	141	};
	142
	143	data[0].d32 = cpu_to_be32(AD5791_CMD_READ \|
	144	AD5791_ADDR(addr));
	145	data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
	146
	147	spi_message_init(&msg);
	148	spi_message_add_tail(&xfers[0], &msg);
	149	spi_message_add_tail(&xfers[1], &msg);
	150	ret = spi_sync(spi, &msg);
	151
	152	*val = be32_to_cpu(data[2].d32);
	153
	154	return ret;
	155	}
	156
4571b39b LPC	157	static const char * const ad5791_powerdown_modes[] = {
	158	"6kohm_to_gnd",
	159	"three_state",
c5b99396	160	};
69d900a6	161
4571b39b LPC	162	static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev,
4571b39b LPC	163	const struct iio_chan_spec *chan)
69d900a6	164	{
f5730d52	165	struct ad5791_state *st = iio_priv(indio_dev);
69d900a6	166
4571b39b	167	return st->pwr_down_mode;
69d900a6 MH	168	}
69d900a6 MH	169
4571b39b LPC	170	static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev,
4571b39b LPC	171	const struct iio_chan_spec *chan, unsigned int mode)
69d900a6	172	{
f5730d52	173	struct ad5791_state *st = iio_priv(indio_dev);
69d900a6	174
4571b39b	175	st->pwr_down_mode = mode;
69d900a6	176
4571b39b	177	return 0;
69d900a6 MH	178	}
69d900a6 MH	179
4571b39b LPC	180	static const struct iio_enum ad5791_powerdown_mode_enum = {
	181	.items = ad5791_powerdown_modes,
	182	.num_items = ARRAY_SIZE(ad5791_powerdown_modes),
	183	.get = ad5791_get_powerdown_mode,
	184	.set = ad5791_set_powerdown_mode,
	185	};
	186
	187	static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev,
	188	uintptr_t private, const struct iio_chan_spec chan, char buf)
69d900a6	189	{
f5730d52	190	struct ad5791_state *st = iio_priv(indio_dev);
69d900a6 MH	191
	192	return sprintf(buf, "%d\n", st->pwr_down);
	193	}
	194
4571b39b LPC	195	static ssize_t ad5791_write_dac_powerdown(struct iio_dev *indio_dev,
	196	uintptr_t private, const struct iio_chan_spec chan, const char buf,
	197	size_t len)
69d900a6	198	{
4468cb55	199	bool pwr_down;
69d900a6	200	int ret;
f5730d52	201	struct ad5791_state *st = iio_priv(indio_dev);
69d900a6	202
4468cb55	203	ret = strtobool(buf, &pwr_down);
69d900a6 MH	204	if (ret)
	205	return ret;
	206
4468cb55	207	if (!pwr_down) {
69d900a6	208	st->ctrl &= ~(AD5791_CTRL_OPGND \| AD5791_CTRL_DACTRI);
4468cb55	209	} else {
69d900a6 MH	210	if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
	211	st->ctrl \|= AD5791_CTRL_OPGND;
	212	else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
	213	st->ctrl \|= AD5791_CTRL_DACTRI;
4468cb55 LPC	214	}
4468cb55 LPC	215	st->pwr_down = pwr_down;
69d900a6 MH	216
	217	ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);
	218
	219	return ret ? ret : len;
	220	}
	221
69d900a6 MH	222	static int ad5791_get_lin_comp(unsigned int span)
	223	{
	224	if (span <= 10000)
	225	return AD5791_LINCOMP_0_10;
	226	else if (span <= 12000)
	227	return AD5791_LINCOMP_10_12;
	228	else if (span <= 16000)
	229	return AD5791_LINCOMP_12_16;
	230	else if (span <= 19000)
	231	return AD5791_LINCOMP_16_19;
	232	else
	233	return AD5791_LINCOMP_19_20;
	234	}
	235
ba1c2bb2 MH	236	static int ad5780_get_lin_comp(unsigned int span)
	237	{
	238	if (span <= 10000)
	239	return AD5780_LINCOMP_0_10;
	240	else
	241	return AD5780_LINCOMP_10_20;
	242	}
ba1c2bb2 MH	243	static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
ba1c2bb2 MH	244	[ID_AD5760] = {
ba1c2bb2 MH	245	.get_lin_comp = ad5780_get_lin_comp,
	246	},
	247	[ID_AD5780] = {
ba1c2bb2 MH	248	.get_lin_comp = ad5780_get_lin_comp,
	249	},
	250	[ID_AD5781] = {
ba1c2bb2 MH	251	.get_lin_comp = ad5791_get_lin_comp,
	252	},
	253	[ID_AD5791] = {
ba1c2bb2 MH	254	.get_lin_comp = ad5791_get_lin_comp,
	255	},
	256	};
	257
c5b99396 JC	258	static int ad5791_read_raw(struct iio_dev *indio_dev,
	259	struct iio_chan_spec const *chan,
	260	int *val,
	261	int *val2,
	262	long m)
	263	{
	264	struct ad5791_state *st = iio_priv(indio_dev);
9dc9961d	265	u64 val64;
c5b99396 JC	266	int ret;
	267
	268	switch (m) {
09f4eb40	269	case IIO_CHAN_INFO_RAW:
c5b99396 JC	270	ret = ad5791_spi_read(st->spi, chan->address, val);
	271	if (ret)
	272	return ret;
	273	*val &= AD5791_DAC_MASK;
	274	*val >>= chan->scan_type.shift;
c5b99396	275	return IIO_VAL_INT;
c8a9f805	276	case IIO_CHAN_INFO_SCALE:
c5b99396	277	*val = 0;
75bb23a2	278	val2 = (((u64)st->vref_mv) 1000000ULL) >> chan->scan_type.realbits;
c5b99396	279	return IIO_VAL_INT_PLUS_MICRO;
c8a9f805	280	case IIO_CHAN_INFO_OFFSET:
9dc9961d LPC	281	val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
	282	do_div(val64, st->vref_mv);
	283	*val = -val64;
	284	return IIO_VAL_INT;
c5b99396 JC	285	default:
	286	return -EINVAL;
	287	}
	288
	289	};
	290
4571b39b LPC	291	static const struct iio_chan_spec_ext_info ad5791_ext_info[] = {
	292	{
	293	.name = "powerdown",
	294	.shared = true,
	295	.read = ad5791_read_dac_powerdown,
	296	.write = ad5791_write_dac_powerdown,
	297	},
	298	IIO_ENUM("powerdown_mode", true, &ad5791_powerdown_mode_enum),
	299	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum),
	300	{ },
	301	};
	302
	303	#define AD5791_CHAN(bits, shift) { \
	304	.type = IIO_VOLTAGE, \
	305	.output = 1, \
	306	.indexed = 1, \
	307	.address = AD5791_ADDR_DAC0, \
	308	.channel = 0, \
	309	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT \| \
	310	IIO_CHAN_INFO_SCALE_SHARED_BIT \| \
	311	IIO_CHAN_INFO_OFFSET_SHARED_BIT, \
	312	.scan_type = IIO_ST('u', bits, 24, shift), \
	313	.ext_info = ad5791_ext_info, \
	314	}
	315
	316	static const struct iio_chan_spec ad5791_channels[] = {
	317	[ID_AD5760] = AD5791_CHAN(16, 4),
	318	[ID_AD5780] = AD5791_CHAN(18, 2),
	319	[ID_AD5781] = AD5791_CHAN(18, 2),
	320	[ID_AD5791] = AD5791_CHAN(20, 0)
	321	};
c5b99396 JC	322
	323	static int ad5791_write_raw(struct iio_dev *indio_dev,
	324	struct iio_chan_spec const *chan,
	325	int val,
	326	int val2,
	327	long mask)
	328	{
	329	struct ad5791_state *st = iio_priv(indio_dev);
	330
	331	switch (mask) {
09f4eb40	332	case IIO_CHAN_INFO_RAW:
021c0a38	333	val &= AD5791_RES_MASK(chan->scan_type.realbits);
c5b99396 JC	334	val <<= chan->scan_type.shift;
	335
	336	return ad5791_spi_write(st->spi, chan->address, val);
	337
	338	default:
	339	return -EINVAL;
	340	}
	341	}
	342
6fe8135f	343	static const struct iio_info ad5791_info = {
c5b99396 JC	344	.read_raw = &ad5791_read_raw,
c5b99396 JC	345	.write_raw = &ad5791_write_raw,
6fe8135f JC	346	.driver_module = THIS_MODULE,
	347	};
	348
fc52692c	349	static int ad5791_probe(struct spi_device *spi)
69d900a6 MH	350	{
69d900a6 MH	351	struct ad5791_platform_data *pdata = spi->dev.platform_data;
f5730d52	352	struct iio_dev *indio_dev;
69d900a6 MH	353	struct ad5791_state *st;
	354	int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
	355
7cbb7537	356	indio_dev = iio_device_alloc(sizeof(*st));
26a54797 JC	357	if (indio_dev == NULL) {
	358	ret = -ENOMEM;
	359	goto error_ret;
	360	}
	361	st = iio_priv(indio_dev);
	362	st->reg_vdd = regulator_get(&spi->dev, "vdd");
	363	if (!IS_ERR(st->reg_vdd)) {
	364	ret = regulator_enable(st->reg_vdd);
69d900a6 MH	365	if (ret)
	366	goto error_put_reg_pos;
	367
7e2dcc69 AL	368	ret = regulator_get_voltage(st->reg_vdd);
	369	if (ret < 0)
	370	goto error_disable_reg_pos;
	371
	372	pos_voltage_uv = ret;
69d900a6 MH	373	}
69d900a6 MH	374
26a54797 JC	375	st->reg_vss = regulator_get(&spi->dev, "vss");
	376	if (!IS_ERR(st->reg_vss)) {
	377	ret = regulator_enable(st->reg_vss);
69d900a6 MH	378	if (ret)
	379	goto error_put_reg_neg;
	380
7e2dcc69 AL	381	ret = regulator_get_voltage(st->reg_vss);
	382	if (ret < 0)
	383	goto error_disable_reg_neg;
	384
	385	neg_voltage_uv = ret;
69d900a6 MH	386	}
69d900a6 MH	387
f5730d52 JC	388	st->pwr_down = true;
	389	st->spi = spi;
	390
9dc9961d LPC	391	if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
	392	st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
	393	st->vref_neg_mv = neg_voltage_uv / 1000;
	394	} else if (pdata) {
	395	st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
	396	st->vref_neg_mv = pdata->vref_neg_mv;
	397	} else {
69d900a6	398	dev_warn(&spi->dev, "reference voltage unspecified\n");
9dc9961d	399	}
69d900a6 MH	400
	401	ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
	402	if (ret)
26a54797	403	goto error_disable_reg_neg;
69d900a6	404
c5b99396 JC	405	st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
c5b99396 JC	406	->driver_data];
69d900a6 MH	407
69d900a6 MH	408
ba1c2bb2 MH	409	st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
ba1c2bb2 MH	410	\| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) \|
69d900a6 MH	411	AD5791_CTRL_BIN2SC;
	412
	413	ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl \|
	414	AD5791_CTRL_OPGND \| AD5791_CTRL_DACTRI);
	415	if (ret)
26a54797	416	goto error_disable_reg_neg;
69d900a6	417
f5730d52 JC	418	spi_set_drvdata(spi, indio_dev);
	419	indio_dev->dev.parent = &spi->dev;
	420	indio_dev->info = &ad5791_info;
	421	indio_dev->modes = INDIO_DIRECT_MODE;
c5b99396 JC	422	indio_dev->channels
	423	= &ad5791_channels[spi_get_device_id(spi)->driver_data];
	424	indio_dev->num_channels = 1;
	425	indio_dev->name = spi_get_device_id(st->spi)->name;
f5730d52	426	ret = iio_device_register(indio_dev);
69d900a6	427	if (ret)
26a54797	428	goto error_disable_reg_neg;
69d900a6 MH	429
	430	return 0;
	431
69d900a6	432	error_disable_reg_neg:
26a54797 JC	433	if (!IS_ERR(st->reg_vss))
26a54797 JC	434	regulator_disable(st->reg_vss);
69d900a6	435	error_put_reg_neg:
26a54797 JC	436	if (!IS_ERR(st->reg_vss))
26a54797 JC	437	regulator_put(st->reg_vss);
69d900a6	438
7e2dcc69	439	error_disable_reg_pos:
26a54797 JC	440	if (!IS_ERR(st->reg_vdd))
26a54797 JC	441	regulator_disable(st->reg_vdd);
69d900a6	442	error_put_reg_pos:
26a54797 JC	443	if (!IS_ERR(st->reg_vdd))
26a54797 JC	444	regulator_put(st->reg_vdd);
7cbb7537	445	iio_device_free(indio_dev);
26a54797	446	error_ret:
69d900a6	447
69d900a6 MH	448	return ret;
	449	}
	450
fc52692c	451	static int ad5791_remove(struct spi_device *spi)
69d900a6	452	{
f5730d52 JC	453	struct iio_dev *indio_dev = spi_get_drvdata(spi);
f5730d52 JC	454	struct ad5791_state *st = iio_priv(indio_dev);
69d900a6	455
d2fffd6c	456	iio_device_unregister(indio_dev);
69d900a6	457	if (!IS_ERR(st->reg_vdd)) {
26a54797 JC	458	regulator_disable(st->reg_vdd);
26a54797 JC	459	regulator_put(st->reg_vdd);
69d900a6 MH	460	}
	461
	462	if (!IS_ERR(st->reg_vss)) {
26a54797 JC	463	regulator_disable(st->reg_vss);
26a54797 JC	464	regulator_put(st->reg_vss);
69d900a6	465	}
7cbb7537	466	iio_device_free(indio_dev);
26d25ae3	467
69d900a6 MH	468	return 0;
	469	}
	470
	471	static const struct spi_device_id ad5791_id[] = {
ba1c2bb2 MH	472	{"ad5760", ID_AD5760},
ba1c2bb2 MH	473	{"ad5780", ID_AD5780},
69d900a6	474	{"ad5781", ID_AD5781},
9d41c5bb	475	{"ad5790", ID_AD5791},
ba1c2bb2	476	{"ad5791", ID_AD5791},
69d900a6 MH	477	{}
69d900a6 MH	478	};
55e4390c	479	MODULE_DEVICE_TABLE(spi, ad5791_id);
69d900a6 MH	480
	481	static struct spi_driver ad5791_driver = {
	482	.driver = {
	483	.name = "ad5791",
	484	.owner = THIS_MODULE,
	485	},
	486	.probe = ad5791_probe,
fc52692c	487	.remove = ad5791_remove,
69d900a6 MH	488	.id_table = ad5791_id,
69d900a6 MH	489	};
ae6ae6fe	490	module_spi_driver(ad5791_driver);
69d900a6 MH	491
69d900a6 MH	492	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
9d41c5bb	493	MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
69d900a6	494	MODULE_LICENSE("GPL v2");