[deliverable/linux.git] / drivers / iio / dac / ad5624r_spi.c

/*
 * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
 *
 * Copyright 2010-2011 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 "ad5624r.h"

static int ad5624r_spi_write(struct spi_device *spi,
			     u8 cmd, u8 addr, u16 val, u8 shift)
{
	u32 data;
	u8 msg[3];

	/*
	 * The input shift register is 24 bits wide. The first two bits are
	 * don't care bits. The next three are the command bits, C2 to C0,
	 * followed by the 3-bit DAC address, A2 to A0, and then the
	 * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
	 * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
	 * for the AD5664R, AD5644R, and AD5624R, respectively.
	 */
	data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift);
	msg[0] = data >> 16;
	msg[1] = data >> 8;
	msg[2] = data;

	return spi_write(spi, msg, 3);
}

static int ad5624r_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5624r_state *st = iio_priv(indio_dev);

	switch (m) {
	case IIO_CHAN_INFO_SCALE:
		*val = st->vref_mv;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
}

static int ad5624r_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct ad5624r_state *st = iio_priv(indio_dev);

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

		return ad5624r_spi_write(st->us,
				AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
				chan->address, val,
				chan->scan_type.shift);
	default:
		return -EINVAL;
	}
}

static const char * const ad5624r_powerdown_modes[] = {
	"1kohm_to_gnd",
	"100kohm_to_gnd",
	"three_state"
};

static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5624r_state *st = iio_priv(indio_dev);

	return st->pwr_down_mode;
}

static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5624r_state *st = iio_priv(indio_dev);

	st->pwr_down_mode = mode;

	return 0;
}

static const struct iio_enum ad5624r_powerdown_mode_enum = {
	.items = ad5624r_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
	.get = ad5624r_get_powerdown_mode,
	.set = ad5624r_set_powerdown_mode,
};

static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
	uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
	struct ad5624r_state *st = iio_priv(indio_dev);

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

static ssize_t ad5624r_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 ad5624r_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 = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
				(st->pwr_down_mode << 4) |
				st->pwr_down_mask, 16);

	return ret ? ret : len;
}

static const struct iio_info ad5624r_info = {
	.write_raw = ad5624r_write_raw,
	.read_raw = ad5624r_read_raw,
	.driver_module = THIS_MODULE,
};

static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
	{
		.name = "powerdown",
		.read = ad5624r_read_dac_powerdown,
		.write = ad5624r_write_dac_powerdown,
		.shared = IIO_SEPARATE,
	},
	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
		 &ad5624r_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
	{ },
};

#define AD5624R_CHANNEL(_chan, _bits) { \
	.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 = (_chan), \
	.scan_type = { \
		.sign = 'u', \
		.realbits = (_bits), \
		.storagebits = 16, \
		.shift = 16 - (_bits), \
	}, \
	.ext_info = ad5624r_ext_info, \
}

#define DECLARE_AD5624R_CHANNELS(_name, _bits) \
	const struct iio_chan_spec _name##_channels[] = { \
		AD5624R_CHANNEL(0, _bits), \
		AD5624R_CHANNEL(1, _bits), \
		AD5624R_CHANNEL(2, _bits), \
		AD5624R_CHANNEL(3, _bits), \
}

static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
static DECLARE_AD5624R_CHANNELS(ad5664r, 16);

static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
	[ID_AD5624R3] = {
		.channels = ad5624r_channels,
		.int_vref_mv = 1250,
	},
	[ID_AD5624R5] = {
		.channels = ad5624r_channels,
		.int_vref_mv = 2500,
	},
	[ID_AD5644R3] = {
		.channels = ad5644r_channels,
		.int_vref_mv = 1250,
	},
	[ID_AD5644R5] = {
		.channels = ad5644r_channels,
		.int_vref_mv = 2500,
	},
	[ID_AD5664R3] = {
		.channels = ad5664r_channels,
		.int_vref_mv = 1250,
	},
	[ID_AD5664R5] = {
		.channels = ad5664r_channels,
		.int_vref_mv = 2500,
	},
};

static int ad5624r_probe(struct spi_device *spi)
{
	struct ad5624r_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)
		return -ENOMEM;
	st = iio_priv(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;
	}

	spi_set_drvdata(spi, indio_dev);
	st->chip_info =
		&ad5624r_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->us = spi;

	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = spi_get_device_id(spi)->name;
	indio_dev->info = &ad5624r_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = st->chip_info->channels;
	indio_dev->num_channels = AD5624R_DAC_CHANNELS;

	ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
				!!voltage_uv, 16);
	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 ad5624r_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct ad5624r_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 ad5624r_id[] = {
	{"ad5624r3", ID_AD5624R3},
	{"ad5644r3", ID_AD5644R3},
	{"ad5664r3", ID_AD5664R3},
	{"ad5624r5", ID_AD5624R5},
	{"ad5644r5", ID_AD5644R5},
	{"ad5664r5", ID_AD5664R5},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5624r_id);

static struct spi_driver ad5624r_driver = {
	.driver = {
		   .name = "ad5624r",
		   },
	.probe = ad5624r_probe,
	.remove = ad5624r_remove,
	.id_table = ad5624r_id,
};
module_spi_driver(ad5624r_driver);

MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
6790e29f BS	1	/*
	2	* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
	3	*
14f88f1b	4	* Copyright 2010-2011 Analog Devices Inc.
6790e29f	5	*
14f88f1b	6	* Licensed under the GPL-2.
6790e29f BS	7	*/
	8
	9	#include <linux/interrupt.h>
6790e29f BS	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>
14f88f1b	16	#include <linux/regulator/consumer.h>
99c97852	17	#include <linux/module.h>
6790e29f	18
06458e27 JC	19	#include <linux/iio/iio.h>
06458e27 JC	20	#include <linux/iio/sysfs.h>
cadb6951	21
6790e29f BS	22	#include "ad5624r.h"
6790e29f BS	23
df9cd105	24	static int ad5624r_spi_write(struct spi_device *spi,
adfa9698	25	u8 cmd, u8 addr, u16 val, u8 shift)
6790e29f	26	{
6790e29f BS	27	u32 data;
	28	u8 msg[3];
	29
	30	/*
14f88f1b MH	31	* The input shift register is 24 bits wide. The first two bits are
	32	* don't care bits. The next three are the command bits, C2 to C0,
	33	* followed by the 3-bit DAC address, A2 to A0, and then the
	34	* 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
	35	* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
	36	* for the AD5664R, AD5644R, and AD5624R, respectively.
6790e29f	37	*/
adfa9698	38	data = (0 << 22) \| (cmd << 19) \| (addr << 16) \| (val << shift);
6790e29f BS	39	msg[0] = data >> 16;
	40	msg[1] = data >> 8;
	41	msg[2] = data;
	42
df9cd105	43	return spi_write(spi, msg, 3);
6790e29f BS	44	}
6790e29f BS	45
275de9f7 LPC	46	static int ad5624r_read_raw(struct iio_dev *indio_dev,
	47	struct iio_chan_spec const *chan,
	48	int *val,
	49	int *val2,
	50	long m)
6790e29f	51	{
3ff24205	52	struct ad5624r_state *st = iio_priv(indio_dev);
6790e29f	53
275de9f7 LPC	54	switch (m) {
275de9f7 LPC	55	case IIO_CHAN_INFO_SCALE:
14229e87 LPC	56	*val = st->vref_mv;
	57	*val2 = chan->scan_type.realbits;
	58	return IIO_VAL_FRACTIONAL_LOG2;
275de9f7 LPC	59	}
	60	return -EINVAL;
	61	}
	62
	63	static int ad5624r_write_raw(struct iio_dev *indio_dev,
	64	struct iio_chan_spec const *chan,
	65	int val,
	66	int val2,
	67	long mask)
	68	{
	69	struct ad5624r_state *st = iio_priv(indio_dev);
275de9f7 LPC	70
275de9f7 LPC	71	switch (mask) {
09f4eb40	72	case IIO_CHAN_INFO_RAW:
275de9f7 LPC	73	if (val >= (1 << chan->scan_type.realbits) \|\| val < 0)
	74	return -EINVAL;
	75
	76	return ad5624r_spi_write(st->us,
	77	AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
	78	chan->address, val,
	79	chan->scan_type.shift);
	80	default:
15255c6b	81	return -EINVAL;
275de9f7	82	}
6790e29f BS	83	}
6790e29f BS	84
66eb9050 LPC	85	static const char * const ad5624r_powerdown_modes[] = {
	86	"1kohm_to_gnd",
	87	"100kohm_to_gnd",
	88	"three_state"
	89	};
	90
	91	static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
	92	const struct iio_chan_spec *chan)
6790e29f	93	{
3ff24205	94	struct ad5624r_state *st = iio_priv(indio_dev);
6790e29f	95
66eb9050	96	return st->pwr_down_mode;
6790e29f BS	97	}
6790e29f BS	98
66eb9050 LPC	99	static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
66eb9050 LPC	100	const struct iio_chan_spec *chan, unsigned int mode)
6790e29f	101	{
3ff24205	102	struct ad5624r_state *st = iio_priv(indio_dev);
6790e29f	103
66eb9050	104	st->pwr_down_mode = mode;
6790e29f	105
66eb9050	106	return 0;
6790e29f BS	107	}
6790e29f BS	108
66eb9050 LPC	109	static const struct iio_enum ad5624r_powerdown_mode_enum = {
	110	.items = ad5624r_powerdown_modes,
	111	.num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
	112	.get = ad5624r_get_powerdown_mode,
	113	.set = ad5624r_set_powerdown_mode,
	114	};
	115
	116	static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
	117	uintptr_t private, const struct iio_chan_spec chan, char buf)
6790e29f	118	{
3ff24205	119	struct ad5624r_state *st = iio_priv(indio_dev);
6790e29f	120
14f88f1b	121	return sprintf(buf, "%d\n",
66eb9050	122	!!(st->pwr_down_mask & (1 << chan->channel)));
6790e29f BS	123	}
6790e29f BS	124
66eb9050 LPC	125	static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,
	126	uintptr_t private, const struct iio_chan_spec chan, const char buf,
	127	size_t len)
6790e29f	128	{
2490594e	129	bool pwr_down;
6790e29f	130	int ret;
3ff24205	131	struct ad5624r_state *st = iio_priv(indio_dev);
6790e29f	132
2490594e	133	ret = strtobool(buf, &pwr_down);
6790e29f BS	134	if (ret)
	135	return ret;
	136
2490594e	137	if (pwr_down)
66eb9050	138	st->pwr_down_mask \|= (1 << chan->channel);
14f88f1b	139	else
2490594e	140	st->pwr_down_mask &= ~(1 << chan->channel);
6790e29f	141
14f88f1b MH	142	ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
	143	(st->pwr_down_mode << 4) \|
	144	st->pwr_down_mask, 16);
6790e29f BS	145
	146	return ret ? ret : len;
	147	}
	148
6fe8135f	149	static const struct iio_info ad5624r_info = {
275de9f7 LPC	150	.write_raw = ad5624r_write_raw,
275de9f7 LPC	151	.read_raw = ad5624r_read_raw,
6fe8135f JC	152	.driver_module = THIS_MODULE,
	153	};
	154
66eb9050 LPC	155	static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
	156	{
	157	.name = "powerdown",
	158	.read = ad5624r_read_dac_powerdown,
	159	.write = ad5624r_write_dac_powerdown,
3704432f	160	.shared = IIO_SEPARATE,
66eb9050	161	},
3704432f JC	162	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
3704432f JC	163	&ad5624r_powerdown_mode_enum),
66eb9050 LPC	164	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
	165	{ },
	166	};
	167
	168	#define AD5624R_CHANNEL(_chan, _bits) { \
	169	.type = IIO_VOLTAGE, \
	170	.indexed = 1, \
	171	.output = 1, \
	172	.channel = (_chan), \
8b686348 JC	173	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
8b686348 JC	174	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
66eb9050	175	.address = (_chan), \
4974600b JC	176	.scan_type = { \
	177	.sign = 'u', \
	178	.realbits = (_bits), \
	179	.storagebits = 16, \
	180	.shift = 16 - (_bits), \
	181	}, \
66eb9050 LPC	182	.ext_info = ad5624r_ext_info, \
	183	}
	184
	185	#define DECLARE_AD5624R_CHANNELS(_name, _bits) \
	186	const struct iio_chan_spec _name##_channels[] = { \
	187	AD5624R_CHANNEL(0, _bits), \
	188	AD5624R_CHANNEL(1, _bits), \
	189	AD5624R_CHANNEL(2, _bits), \
	190	AD5624R_CHANNEL(3, _bits), \
	191	}
	192
	193	static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
	194	static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
	195	static DECLARE_AD5624R_CHANNELS(ad5664r, 16);
	196
	197	static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
	198	[ID_AD5624R3] = {
	199	.channels = ad5624r_channels,
	200	.int_vref_mv = 1250,
	201	},
	202	[ID_AD5624R5] = {
	203	.channels = ad5624r_channels,
	204	.int_vref_mv = 2500,
	205	},
	206	[ID_AD5644R3] = {
	207	.channels = ad5644r_channels,
	208	.int_vref_mv = 1250,
	209	},
	210	[ID_AD5644R5] = {
	211	.channels = ad5644r_channels,
	212	.int_vref_mv = 2500,
	213	},
	214	[ID_AD5664R3] = {
	215	.channels = ad5664r_channels,
	216	.int_vref_mv = 1250,
	217	},
	218	[ID_AD5664R5] = {
	219	.channels = ad5664r_channels,
	220	.int_vref_mv = 2500,
	221	},
	222	};
	223
fc52692c	224	static int ad5624r_probe(struct spi_device *spi)
6790e29f	225	{
6790e29f	226	struct ad5624r_state *st;
3ff24205	227	struct iio_dev *indio_dev;
14f88f1b	228	int ret, voltage_uv = 0;
6790e29f	229
75238230 SK	230	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	231	if (!indio_dev)
	232	return -ENOMEM;
3ff24205	233	st = iio_priv(indio_dev);
75238230	234	st->reg = devm_regulator_get(&spi->dev, "vcc");
26a54797 JC	235	if (!IS_ERR(st->reg)) {
	236	ret = regulator_enable(st->reg);
	237	if (ret)
75238230	238	return ret;
26a54797	239
8434e785 AL	240	ret = regulator_get_voltage(st->reg);
	241	if (ret < 0)
	242	goto error_disable_reg;
	243
	244	voltage_uv = ret;
26a54797 JC	245	}
26a54797 JC	246
3ff24205	247	spi_set_drvdata(spi, indio_dev);
14f88f1b MH	248	st->chip_info =
	249	&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
	250
	251	if (voltage_uv)
	252	st->vref_mv = voltage_uv / 1000;
	253	else
	254	st->vref_mv = st->chip_info->int_vref_mv;
6790e29f BS	255
6790e29f BS	256	st->us = spi;
6790e29f	257
3ff24205 JC	258	indio_dev->dev.parent = &spi->dev;
	259	indio_dev->name = spi_get_device_id(spi)->name;
	260	indio_dev->info = &ad5624r_info;
	261	indio_dev->modes = INDIO_DIRECT_MODE;
275de9f7 LPC	262	indio_dev->channels = st->chip_info->channels;
275de9f7 LPC	263	indio_dev->num_channels = AD5624R_DAC_CHANNELS;
3ff24205	264
3e394407 JC	265	ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
3e394407 JC	266	!!voltage_uv, 16);
6790e29f	267	if (ret)
26a54797	268	goto error_disable_reg;
6790e29f	269
3e394407	270	ret = iio_device_register(indio_dev);
14f88f1b	271	if (ret)
26a54797	272	goto error_disable_reg;
6790e29f BS	273
	274	return 0;
	275
14f88f1b	276	error_disable_reg:
26a54797 JC	277	if (!IS_ERR(st->reg))
26a54797 JC	278	regulator_disable(st->reg);
14f88f1b	279
6790e29f BS	280	return ret;
	281	}
	282
fc52692c	283	static int ad5624r_remove(struct spi_device *spi)
6790e29f	284	{
3ff24205 JC	285	struct iio_dev *indio_dev = spi_get_drvdata(spi);
3ff24205 JC	286	struct ad5624r_state *st = iio_priv(indio_dev);
3ff24205	287
d2fffd6c	288	iio_device_unregister(indio_dev);
75238230	289	if (!IS_ERR(st->reg))
26a54797	290	regulator_disable(st->reg);
14f88f1b	291
6790e29f BS	292	return 0;
	293	}
	294
ece30c15	295	static const struct spi_device_id ad5624r_id[] = {
14f88f1b MH	296	{"ad5624r3", ID_AD5624R3},
	297	{"ad5644r3", ID_AD5644R3},
	298	{"ad5664r3", ID_AD5664R3},
	299	{"ad5624r5", ID_AD5624R5},
	300	{"ad5644r5", ID_AD5644R5},
	301	{"ad5664r5", ID_AD5664R5},
ece30c15 MH	302	{}
ece30c15 MH	303	};
55e4390c	304	MODULE_DEVICE_TABLE(spi, ad5624r_id);
ece30c15	305
6790e29f BS	306	static struct spi_driver ad5624r_driver = {
6790e29f BS	307	.driver = {
24d6050b	308	.name = "ad5624r",
24d6050b	309	},
6790e29f	310	.probe = ad5624r_probe,
fc52692c	311	.remove = ad5624r_remove,
ece30c15	312	.id_table = ad5624r_id,
6790e29f	313	};
ae6ae6fe	314	module_spi_driver(ad5624r_driver);
6790e29f BS	315
	316	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	317	MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
	318	MODULE_LICENSE("GPL v2");