[mirror_ubuntu-jammy-kernel.git] / drivers / staging / iio / adc / ad799x_core.c

/*
 * iio/adc/ad799x.c
 * Copyright (C) 2010-1011 Michael Hennerich, Analog Devices Inc.
 *
 * based on iio/adc/max1363
 * Copyright (C) 2008-2010 Jonathan Cameron
 *
 * based on linux/drivers/i2c/chips/max123x
 * Copyright (C) 2002-2004 Stefan Eletzhofer
 *
 * based on linux/drivers/acron/char/pcf8583.c
 * Copyright (C) 2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * ad799x.c
 *
 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
 * ad7998 and similar chips.
 *
 */

#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/buffer.h>

#include "ad799x.h"

/*
 * ad799x register access by I2C
 */
static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
{
	struct i2c_client *client = st->client;
	int ret = 0;

	ret = i2c_smbus_read_word_swapped(client, reg);
	if (ret < 0) {
		dev_err(&client->dev, "I2C read error\n");
		return ret;
	}

	*data = (u16)ret;

	return 0;
}

static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
{
	struct i2c_client *client = st->client;
	int ret = 0;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0) {
		dev_err(&client->dev, "I2C read error\n");
		return ret;
	}

	*data = (u8)ret;

	return 0;
}

static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
{
	struct i2c_client *client = st->client;
	int ret = 0;

	ret = i2c_smbus_write_word_swapped(client, reg, data);
	if (ret < 0)
		dev_err(&client->dev, "I2C write error\n");

	return ret;
}

static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
{
	struct i2c_client *client = st->client;
	int ret = 0;

	ret = i2c_smbus_write_byte_data(client, reg, data);
	if (ret < 0)
		dev_err(&client->dev, "I2C write error\n");

	return ret;
}

static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
	const unsigned long *scan_mask)
{
	struct ad799x_state *st = iio_priv(indio_dev);

	kfree(st->rx_buf);
	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
	if (!st->rx_buf)
		return -ENOMEM;

	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;

	switch (st->id) {
	case ad7997:
	case ad7998:
		return ad799x_i2c_write16(st, AD7998_CONF_REG,
			st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
	default:
		break;
	}

	return 0;
}

static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
{
	u16 rxbuf;
	u8 cmd;
	int ret;

	switch (st->id) {
	case ad7991:
	case ad7995:
	case ad7999:
		cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
		break;
	case ad7992:
	case ad7993:
	case ad7994:
		cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
		break;
	case ad7997:
	case ad7998:
		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
		break;
	default:
		return -EINVAL;
	}

	ret = ad799x_i2c_read16(st, cmd, &rxbuf);
	if (ret < 0)
		return ret;

	return rxbuf;
}

static int ad799x_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&indio_dev->mlock);
		if (iio_buffer_enabled(indio_dev))
			ret = -EBUSY;
		else
			ret = ad799x_scan_direct(st, chan->scan_index);
		mutex_unlock(&indio_dev->mlock);

		if (ret < 0)
			return ret;
		*val = (ret >> chan->scan_type.shift) &
			RES_MASK(chan->scan_type.realbits);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = st->int_vref_mv;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
}
static const unsigned int ad7998_frequencies[] = {
	[AD7998_CYC_DIS]	= 0,
	[AD7998_CYC_TCONF_32]	= 15625,
	[AD7998_CYC_TCONF_64]	= 7812,
	[AD7998_CYC_TCONF_128]	= 3906,
	[AD7998_CYC_TCONF_512]	= 976,
	[AD7998_CYC_TCONF_1024]	= 488,
	[AD7998_CYC_TCONF_2048]	= 244,
};
static ssize_t ad799x_read_frequency(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad799x_state *st = iio_priv(indio_dev);

	int ret;
	u8 val;
	ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
	if (ret)
		return ret;

	val &= AD7998_CYC_MASK;

	return sprintf(buf, "%u\n", ad7998_frequencies[val]);
}

static ssize_t ad799x_write_frequency(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf,
					 size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad799x_state *st = iio_priv(indio_dev);

	long val;
	int ret, i;
	u8 t;

	ret = kstrtol(buf, 10, &val);
	if (ret)
		return ret;

	mutex_lock(&indio_dev->mlock);
	ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
	if (ret)
		goto error_ret_mutex;
	/* Wipe the bits clean */
	t &= ~AD7998_CYC_MASK;

	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
		if (val == ad7998_frequencies[i])
			break;
	if (i == ARRAY_SIZE(ad7998_frequencies)) {
		ret = -EINVAL;
		goto error_ret_mutex;
	}
	t |= i;
	ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);

error_ret_mutex:
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
}

static int ad799x_read_event_config(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir)
{
	return 1;
}

static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
					 enum iio_event_direction dir,
					 enum iio_event_info info)
{
	switch (info) {
	case IIO_EV_INFO_VALUE:
		if (dir == IIO_EV_DIR_FALLING)
			return AD7998_DATALOW_REG(chan->channel);
		else
			return AD7998_DATAHIGH_REG(chan->channel);
	case IIO_EV_INFO_HYSTERESIS:
		return AD7998_HYST_REG(chan->channel);
	default:
		return -EINVAL;
	}

	return 0;
}

static int ad799x_write_event_value(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir,
				    enum iio_event_info info,
				    int val, int val2)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);

	mutex_lock(&indio_dev->mlock);
	ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
		val);
	mutex_unlock(&indio_dev->mlock);

	return ret;
}

static int ad799x_read_event_value(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir,
				    enum iio_event_info info,
				    int *val, int *val2)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);
	u16 valin;

	mutex_lock(&indio_dev->mlock);
	ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
		&valin);
	mutex_unlock(&indio_dev->mlock);
	if (ret < 0)
		return ret;
	*val = valin;

	return IIO_VAL_INT;
}

static irqreturn_t ad799x_event_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct ad799x_state *st = iio_priv(private);
	u8 status;
	int i, ret;

	ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
	if (ret)
		goto done;

	if (!status)
		goto done;

	ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);

	for (i = 0; i < 8; i++) {
		if (status & (1 << i))
			iio_push_event(indio_dev,
				       i & 0x1 ?
				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
							    (i >> 1),
							    IIO_EV_TYPE_THRESH,
							    IIO_EV_DIR_RISING) :
				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
							    (i >> 1),
							    IIO_EV_TYPE_THRESH,
							    IIO_EV_DIR_FALLING),
				       iio_get_time_ns());
	}

done:
	return IRQ_HANDLED;
}

static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
			      ad799x_read_frequency,
			      ad799x_write_frequency);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");

static struct attribute *ad799x_event_attributes[] = {
	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static struct attribute_group ad799x_event_attrs_group = {
	.attrs = ad799x_event_attributes,
	.name = "events",
};

static const struct iio_info ad7991_info = {
	.read_raw = &ad799x_read_raw,
	.driver_module = THIS_MODULE,
};

static const struct iio_info ad7993_4_7_8_info = {
	.read_raw = &ad799x_read_raw,
	.event_attrs = &ad799x_event_attrs_group,
	.read_event_config = &ad799x_read_event_config,
	.read_event_value = &ad799x_read_event_value,
	.write_event_value = &ad799x_write_event_value,
	.driver_module = THIS_MODULE,
	.update_scan_mode = ad7997_8_update_scan_mode,
};

static const struct iio_event_spec ad799x_events[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_EITHER,
		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
	},
};

#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.channel = (_index), \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	.scan_index = (_index), \
	.scan_type = { \
		.sign = 'u', \
		.realbits = (_realbits), \
		.storagebits = 16, \
		.shift = 12 - (_realbits), \
		.endianness = IIO_BE, \
	}, \
	.event_spec = _ev_spec, \
	.num_event_specs = _num_ev_spec, \
}

#define AD799X_CHANNEL(_index, _realbits) \
	_AD799X_CHANNEL(_index, _realbits, NULL, 0)

#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
		ARRAY_SIZE(ad799x_events))

static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
	[ad7991] = {
		.channel = {
			AD799X_CHANNEL(0, 12),
			AD799X_CHANNEL(1, 12),
			AD799X_CHANNEL(2, 12),
			AD799X_CHANNEL(3, 12),
			IIO_CHAN_SOFT_TIMESTAMP(4),
		},
		.num_channels = 5,
		.info = &ad7991_info,
	},
	[ad7995] = {
		.channel = {
			AD799X_CHANNEL(0, 10),
			AD799X_CHANNEL(1, 10),
			AD799X_CHANNEL(2, 10),
			AD799X_CHANNEL(3, 10),
			IIO_CHAN_SOFT_TIMESTAMP(4),
		},
		.num_channels = 5,
		.info = &ad7991_info,
	},
	[ad7999] = {
		.channel = {
			AD799X_CHANNEL(0, 8),
			AD799X_CHANNEL(1, 8),
			AD799X_CHANNEL(2, 8),
			AD799X_CHANNEL(3, 8),
			IIO_CHAN_SOFT_TIMESTAMP(4),
		},
		.num_channels = 5,
		.info = &ad7991_info,
	},
	[ad7992] = {
		.channel = {
			AD799X_CHANNEL_WITH_EVENTS(0, 12),
			AD799X_CHANNEL_WITH_EVENTS(1, 12),
			IIO_CHAN_SOFT_TIMESTAMP(3),
		},
		.num_channels = 3,
		.default_config = AD7998_ALERT_EN,
		.info = &ad7993_4_7_8_info,
	},
	[ad7993] = {
		.channel = {
			AD799X_CHANNEL_WITH_EVENTS(0, 10),
			AD799X_CHANNEL_WITH_EVENTS(1, 10),
			AD799X_CHANNEL_WITH_EVENTS(2, 10),
			AD799X_CHANNEL_WITH_EVENTS(3, 10),
			IIO_CHAN_SOFT_TIMESTAMP(4),
		},
		.num_channels = 5,
		.default_config = AD7998_ALERT_EN,
		.info = &ad7993_4_7_8_info,
	},
	[ad7994] = {
		.channel = {
			AD799X_CHANNEL_WITH_EVENTS(0, 12),
			AD799X_CHANNEL_WITH_EVENTS(1, 12),
			AD799X_CHANNEL_WITH_EVENTS(2, 12),
			AD799X_CHANNEL_WITH_EVENTS(3, 12),
			IIO_CHAN_SOFT_TIMESTAMP(4),
		},
		.num_channels = 5,
		.default_config = AD7998_ALERT_EN,
		.info = &ad7993_4_7_8_info,
	},
	[ad7997] = {
		.channel = {
			AD799X_CHANNEL_WITH_EVENTS(0, 10),
			AD799X_CHANNEL_WITH_EVENTS(1, 10),
			AD799X_CHANNEL_WITH_EVENTS(2, 10),
			AD799X_CHANNEL_WITH_EVENTS(3, 10),
			AD799X_CHANNEL(4, 10),
			AD799X_CHANNEL(5, 10),
			AD799X_CHANNEL(6, 10),
			AD799X_CHANNEL(7, 10),
			IIO_CHAN_SOFT_TIMESTAMP(8),
		},
		.num_channels = 9,
		.default_config = AD7998_ALERT_EN,
		.info = &ad7993_4_7_8_info,
	},
	[ad7998] = {
		.channel = {
			AD799X_CHANNEL_WITH_EVENTS(0, 12),
			AD799X_CHANNEL_WITH_EVENTS(1, 12),
			AD799X_CHANNEL_WITH_EVENTS(2, 12),
			AD799X_CHANNEL_WITH_EVENTS(3, 12),
			AD799X_CHANNEL(4, 12),
			AD799X_CHANNEL(5, 12),
			AD799X_CHANNEL(6, 12),
			AD799X_CHANNEL(7, 12),
			IIO_CHAN_SOFT_TIMESTAMP(8),
		},
		.num_channels = 9,
		.default_config = AD7998_ALERT_EN,
		.info = &ad7993_4_7_8_info,
	},
};

static int ad799x_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	int ret;
	struct ad799x_platform_data *pdata = client->dev.platform_data;
	struct ad799x_state *st;
	struct iio_dev *indio_dev;

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

	st = iio_priv(indio_dev);
	/* this is only used for device removal purposes */
	i2c_set_clientdata(client, indio_dev);

	st->id = id->driver_data;
	st->chip_info = &ad799x_chip_info_tbl[st->id];
	st->config = st->chip_info->default_config;

	/* TODO: Add pdata options for filtering and bit delay */

	if (!pdata)
		return -EINVAL;

	st->int_vref_mv = pdata->vref_mv;

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

	indio_dev->dev.parent = &client->dev;
	indio_dev->name = id->name;
	indio_dev->info = st->chip_info->info;

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = st->chip_info->channel;
	indio_dev->num_channels = st->chip_info->num_channels;

	ret = ad799x_register_ring_funcs_and_init(indio_dev);
	if (ret)
		goto error_disable_reg;

	if (client->irq > 0) {
		ret = request_threaded_irq(client->irq,
					   NULL,
					   ad799x_event_handler,
					   IRQF_TRIGGER_FALLING |
					   IRQF_ONESHOT,
					   client->name,
					   indio_dev);
		if (ret)
			goto error_cleanup_ring;
	}
	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_free_irq;

	return 0;

error_free_irq:
	if (client->irq > 0)
		free_irq(client->irq, indio_dev);
error_cleanup_ring:
	ad799x_ring_cleanup(indio_dev);
error_disable_reg:
	if (!IS_ERR(st->reg))
		regulator_disable(st->reg);

	return ret;
}

static int ad799x_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct ad799x_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (client->irq > 0)
		free_irq(client->irq, indio_dev);

	ad799x_ring_cleanup(indio_dev);
	if (!IS_ERR(st->reg))
		regulator_disable(st->reg);
	kfree(st->rx_buf);

	return 0;
}

static const struct i2c_device_id ad799x_id[] = {
	{ "ad7991", ad7991 },
	{ "ad7995", ad7995 },
	{ "ad7999", ad7999 },
	{ "ad7992", ad7992 },
	{ "ad7993", ad7993 },
	{ "ad7994", ad7994 },
	{ "ad7997", ad7997 },
	{ "ad7998", ad7998 },
	{}
};

MODULE_DEVICE_TABLE(i2c, ad799x_id);

static struct i2c_driver ad799x_driver = {
	.driver = {
		.name = "ad799x",
	},
	.probe = ad799x_probe,
	.remove = ad799x_remove,
	.id_table = ad799x_id,
};
module_i2c_driver(ad799x_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
985dbe77 MH	1	/*
985dbe77 MH	2	* iio/adc/ad799x.c
d22fd9c5	3	* Copyright (C) 2010-1011 Michael Hennerich, Analog Devices Inc.
985dbe77 MH	4	*
	5	* based on iio/adc/max1363
	6	* Copyright (C) 2008-2010 Jonathan Cameron
	7	*
	8	* based on linux/drivers/i2c/chips/max123x
	9	* Copyright (C) 2002-2004 Stefan Eletzhofer
	10	*
	11	* based on linux/drivers/acron/char/pcf8583.c
	12	* Copyright (C) 2000 Russell King
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License version 2 as
	16	* published by the Free Software Foundation.
	17	*
	18	* ad799x.c
	19	*
	20	* Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
	21	* ad7998 and similar chips.
	22	*
	23	*/
	24
	25	#include <linux/interrupt.h>
985dbe77 MH	26	#include <linux/device.h>
	27	#include <linux/kernel.h>
	28	#include <linux/sysfs.h>
985dbe77 MH	29	#include <linux/i2c.h>
	30	#include <linux/regulator/consumer.h>
	31	#include <linux/slab.h>
	32	#include <linux/types.h>
	33	#include <linux/err.h>
99c97852	34	#include <linux/module.h>
985dbe77	35
06458e27 JC	36	#include <linux/iio/iio.h>
	37	#include <linux/iio/sysfs.h>
	38	#include <linux/iio/events.h>
	39	#include <linux/iio/buffer.h>
cdf38709	40
985dbe77 MH	41	#include "ad799x.h"
	42
	43	/*
	44	* ad799x register access by I2C
	45	*/
	46	static int ad799x_i2c_read16(struct ad799x_state st, u8 reg, u16 data)
	47	{
	48	struct i2c_client *client = st->client;
	49	int ret = 0;
	50
34244cec	51	ret = i2c_smbus_read_word_swapped(client, reg);
985dbe77 MH	52	if (ret < 0) {
	53	dev_err(&client->dev, "I2C read error\n");
	54	return ret;
	55	}
	56
34244cec	57	*data = (u16)ret;
985dbe77 MH	58
	59	return 0;
	60	}
	61
	62	static int ad799x_i2c_read8(struct ad799x_state st, u8 reg, u8 data)
	63	{
	64	struct i2c_client *client = st->client;
	65	int ret = 0;
	66
aecac191	67	ret = i2c_smbus_read_byte_data(client, reg);
985dbe77 MH	68	if (ret < 0) {
	69	dev_err(&client->dev, "I2C read error\n");
	70	return ret;
	71	}
	72
aecac191	73	*data = (u8)ret;
985dbe77 MH	74
	75	return 0;
	76	}
	77
	78	static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
	79	{
	80	struct i2c_client *client = st->client;
	81	int ret = 0;
	82
34244cec	83	ret = i2c_smbus_write_word_swapped(client, reg, data);
985dbe77 MH	84	if (ret < 0)
	85	dev_err(&client->dev, "I2C write error\n");
	86
	87	return ret;
	88	}
	89
	90	static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
	91	{
	92	struct i2c_client *client = st->client;
	93	int ret = 0;
	94
	95	ret = i2c_smbus_write_byte_data(client, reg, data);
	96	if (ret < 0)
	97	dev_err(&client->dev, "I2C write error\n");
	98
	99	return ret;
	100	}
	101
ae3805c3 LPC	102	static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
ae3805c3 LPC	103	const unsigned long *scan_mask)
985dbe77	104	{
ae3805c3 LPC	105	struct ad799x_state *st = iio_priv(indio_dev);
ae3805c3 LPC	106
d8dca330 LPC	107	kfree(st->rx_buf);
	108	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
	109	if (!st->rx_buf)
	110	return -ENOMEM;
	111
	112	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
	113
ae3805c3 LPC	114	switch (st->id) {
	115	case ad7997:
	116	case ad7998:
	117	return ad799x_i2c_write16(st, AD7998_CONF_REG,
	118	st->config \| (*scan_mask << AD799X_CHANNEL_SHIFT));
	119	default:
	120	break;
	121	}
	122
	123	return 0;
985dbe77 MH	124	}
985dbe77 MH	125
d22fd9c5	126	static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
985dbe77	127	{
d22fd9c5 MH	128	u16 rxbuf;
d22fd9c5 MH	129	u8 cmd;
985dbe77 MH	130	int ret;
985dbe77 MH	131
d22fd9c5 MH	132	switch (st->id) {
	133	case ad7991:
	134	case ad7995:
	135	case ad7999:
	136	cmd = st->config \| ((1 << ch) << AD799X_CHANNEL_SHIFT);
	137	break;
	138	case ad7992:
	139	case ad7993:
	140	case ad7994:
	141	cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
	142	break;
	143	case ad7997:
	144	case ad7998:
	145	cmd = (ch << AD799X_CHANNEL_SHIFT) \| AD7997_8_READ_SINGLE;
	146	break;
	147	default:
	148	return -EINVAL;
985dbe77 MH	149	}
985dbe77 MH	150
d22fd9c5 MH	151	ret = ad799x_i2c_read16(st, cmd, &rxbuf);
	152	if (ret < 0)
	153	return ret;
	154
	155	return rxbuf;
985dbe77 MH	156	}
985dbe77 MH	157
84f79ecb	158	static int ad799x_read_raw(struct iio_dev *indio_dev,
d22fd9c5 MH	159	struct iio_chan_spec const *chan,
	160	int *val,
	161	int *val2,
	162	long m)
985dbe77	163	{
d22fd9c5	164	int ret;
84f79ecb	165	struct ad799x_state *st = iio_priv(indio_dev);
d22fd9c5 MH	166
d22fd9c5 MH	167	switch (m) {
b11f98ff	168	case IIO_CHAN_INFO_RAW:
84f79ecb JC	169	mutex_lock(&indio_dev->mlock);
84f79ecb JC	170	if (iio_buffer_enabled(indio_dev))
729bbf54	171	ret = -EBUSY;
d22fd9c5	172	else
58dffaed	173	ret = ad799x_scan_direct(st, chan->scan_index);
84f79ecb	174	mutex_unlock(&indio_dev->mlock);
985dbe77	175
985dbe77	176	if (ret < 0)
d22fd9c5	177	return ret;
5357ba3d JC	178	*val = (ret >> chan->scan_type.shift) &
5357ba3d JC	179	RES_MASK(chan->scan_type.realbits);
d22fd9c5	180	return IIO_VAL_INT;
c8a9f805	181	case IIO_CHAN_INFO_SCALE:
b740f48a LPC	182	*val = st->int_vref_mv;
	183	*val2 = chan->scan_type.realbits;
	184	return IIO_VAL_FRACTIONAL_LOG2;
985dbe77	185	}
d22fd9c5	186	return -EINVAL;
985dbe77	187	}
24cba406 JC	188	static const unsigned int ad7998_frequencies[] = {
	189	[AD7998_CYC_DIS] = 0,
	190	[AD7998_CYC_TCONF_32] = 15625,
	191	[AD7998_CYC_TCONF_64] = 7812,
	192	[AD7998_CYC_TCONF_128] = 3906,
	193	[AD7998_CYC_TCONF_512] = 976,
	194	[AD7998_CYC_TCONF_1024] = 488,
	195	[AD7998_CYC_TCONF_2048] = 244,
	196	};
985dbe77 MH	197	static ssize_t ad799x_read_frequency(struct device *dev,
	198	struct device_attribute *attr,
	199	char *buf)
	200	{
62c51839	201	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
84f79ecb	202	struct ad799x_state *st = iio_priv(indio_dev);
985dbe77	203
24cba406	204	int ret;
985dbe77 MH	205	u8 val;
	206	ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
	207	if (ret)
	208	return ret;
	209
	210	val &= AD7998_CYC_MASK;
	211
24cba406	212	return sprintf(buf, "%u\n", ad7998_frequencies[val]);
985dbe77 MH	213	}
	214
	215	static ssize_t ad799x_write_frequency(struct device *dev,
	216	struct device_attribute *attr,
	217	const char *buf,
	218	size_t len)
	219	{
62c51839	220	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
84f79ecb	221	struct ad799x_state *st = iio_priv(indio_dev);
985dbe77 MH	222
985dbe77 MH	223	long val;
24cba406	224	int ret, i;
985dbe77 MH	225	u8 t;
985dbe77 MH	226
f86f8362	227	ret = kstrtol(buf, 10, &val);
985dbe77 MH	228	if (ret)
	229	return ret;
	230
84f79ecb	231	mutex_lock(&indio_dev->mlock);
985dbe77 MH	232	ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
	233	if (ret)
	234	goto error_ret_mutex;
	235	/* Wipe the bits clean */
	236	t &= ~AD7998_CYC_MASK;
	237
24cba406 JC	238	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
	239	if (val == ad7998_frequencies[i])
	240	break;
	241	if (i == ARRAY_SIZE(ad7998_frequencies)) {
985dbe77 MH	242	ret = -EINVAL;
	243	goto error_ret_mutex;
	244	}
24cba406	245	t \|= i;
985dbe77 MH	246	ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
	247
	248	error_ret_mutex:
84f79ecb	249	mutex_unlock(&indio_dev->mlock);
985dbe77 MH	250
	251	return ret ? ret : len;
	252	}
	253
84f79ecb	254	static int ad799x_read_event_config(struct iio_dev *indio_dev,
5b9e048a LPC	255	const struct iio_chan_spec *chan,
	256	enum iio_event_type type,
	257	enum iio_event_direction dir)
231c5c3b JC	258	{
	259	return 1;
	260	}
	261
ba1d7961 LPC	262	static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
	263	enum iio_event_direction dir,
	264	enum iio_event_info info)
69582b88	265	{
ba1d7961 LPC	266	switch (info) {
	267	case IIO_EV_INFO_VALUE:
	268	if (dir == IIO_EV_DIR_FALLING)
	269	return AD7998_DATALOW_REG(chan->channel);
	270	else
	271	return AD7998_DATAHIGH_REG(chan->channel);
	272	case IIO_EV_INFO_HYSTERESIS:
	273	return AD7998_HYST_REG(chan->channel);
	274	default:
	275	return -EINVAL;
	276	}
	277
	278	return 0;
69582b88	279	}
231c5c3b JC	280
231c5c3b JC	281	static int ad799x_write_event_value(struct iio_dev *indio_dev,
5b9e048a LPC	282	const struct iio_chan_spec *chan,
	283	enum iio_event_type type,
	284	enum iio_event_direction dir,
	285	enum iio_event_info info,
	286	int val, int val2)
231c5c3b JC	287	{
	288	int ret;
	289	struct ad799x_state *st = iio_priv(indio_dev);
231c5c3b JC	290
231c5c3b JC	291	mutex_lock(&indio_dev->mlock);
ba1d7961 LPC	292	ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
ba1d7961 LPC	293	val);
231c5c3b JC	294	mutex_unlock(&indio_dev->mlock);
	295
	296	return ret;
	297	}
	298
	299	static int ad799x_read_event_value(struct iio_dev *indio_dev,
5b9e048a LPC	300	const struct iio_chan_spec *chan,
	301	enum iio_event_type type,
	302	enum iio_event_direction dir,
	303	enum iio_event_info info,
	304	int val, int val2)
231c5c3b JC	305	{
	306	int ret;
	307	struct ad799x_state *st = iio_priv(indio_dev);
231c5c3b JC	308	u16 valin;
	309
	310	mutex_lock(&indio_dev->mlock);
ba1d7961 LPC	311	ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
ba1d7961 LPC	312	&valin);
231c5c3b JC	313	mutex_unlock(&indio_dev->mlock);
	314	if (ret < 0)
	315	return ret;
	316	*val = valin;
	317
5b9e048a	318	return IIO_VAL_INT;
231c5c3b JC	319	}
231c5c3b JC	320
72148f6e	321	static irqreturn_t ad799x_event_handler(int irq, void *private)
985dbe77	322	{
72148f6e	323	struct iio_dev *indio_dev = private;
d8aea29b	324	struct ad799x_state *st = iio_priv(private);
985dbe77	325	u8 status;
72148f6e	326	int i, ret;
985dbe77	327
72148f6e JC	328	ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
72148f6e JC	329	if (ret)
f654a7e2	330	goto done;
985dbe77 MH	331
985dbe77 MH	332	if (!status)
f654a7e2	333	goto done;
985dbe77 MH	334
	335	ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
	336
	337	for (i = 0; i < 8; i++) {
	338	if (status & (1 << i))
5aa96188	339	iio_push_event(indio_dev,
72148f6e	340	i & 0x1 ?
6835cb6b	341	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
cdf38709 JC	342	(i >> 1),
	343	IIO_EV_TYPE_THRESH,
	344	IIO_EV_DIR_RISING) :
6835cb6b	345	IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
cdf38709 JC	346	(i >> 1),
	347	IIO_EV_TYPE_THRESH,
	348	IIO_EV_DIR_FALLING),
72148f6e	349	iio_get_time_ns());
985dbe77 MH	350	}
985dbe77 MH	351
f654a7e2	352	done:
72148f6e	353	return IRQ_HANDLED;
985dbe77 MH	354	}
985dbe77 MH	355
985dbe77 MH	356	static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR \| S_IRUGO,
	357	ad799x_read_frequency,
	358	ad799x_write_frequency);
	359	static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
	360
ba1d7961	361	static struct attribute *ad799x_event_attributes[] = {
985dbe77 MH	362	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	363	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	364	NULL,
	365	};
	366
ba1d7961 LPC	367	static struct attribute_group ad799x_event_attrs_group = {
ba1d7961 LPC	368	.attrs = ad799x_event_attributes,
8e7d9672	369	.name = "events",
985dbe77 MH	370	};
985dbe77 MH	371
6fe8135f JC	372	static const struct iio_info ad7991_info = {
	373	.read_raw = &ad799x_read_raw,
	374	.driver_module = THIS_MODULE,
	375	};
	376
6fe8135f JC	377	static const struct iio_info ad7993_4_7_8_info = {
6fe8135f JC	378	.read_raw = &ad799x_read_raw,
ba1d7961	379	.event_attrs = &ad799x_event_attrs_group,
cb955852 LPC	380	.read_event_config = &ad799x_read_event_config,
	381	.read_event_value = &ad799x_read_event_value,
	382	.write_event_value = &ad799x_write_event_value,
6fe8135f	383	.driver_module = THIS_MODULE,
ae3805c3	384	.update_scan_mode = ad7997_8_update_scan_mode,
6fe8135f JC	385	};
6fe8135f JC	386
5b9e048a LPC	387	static const struct iio_event_spec ad799x_events[] = {
	388	{
	389	.type = IIO_EV_TYPE_THRESH,
	390	.dir = IIO_EV_DIR_RISING,
	391	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
	392	BIT(IIO_EV_INFO_ENABLE),
	393	}, {
	394	.type = IIO_EV_TYPE_THRESH,
	395	.dir = IIO_EV_DIR_FALLING,
d180371d	396	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
5b9e048a	397	BIT(IIO_EV_INFO_ENABLE),
ba1d7961 LPC	398	}, {
	399	.type = IIO_EV_TYPE_THRESH,
	400	.dir = IIO_EV_DIR_EITHER,
	401	.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
5b9e048a LPC	402	},
5b9e048a LPC	403	};
231c5c3b	404
5b9e048a	405	#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
ae6d6489 LPC	406	.type = IIO_VOLTAGE, \
	407	.indexed = 1, \
	408	.channel = (_index), \
	409	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
d00698df	410	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
ae6d6489	411	.scan_index = (_index), \
83d5f324 JC	412	.scan_type = { \
	413	.sign = 'u', \
	414	.realbits = (_realbits), \
	415	.storagebits = 16, \
	416	.shift = 12 - (_realbits), \
	417	.endianness = IIO_BE, \
	418	}, \
5b9e048a LPC	419	.event_spec = _ev_spec, \
5b9e048a LPC	420	.num_event_specs = _num_ev_spec, \
ae6d6489 LPC	421	}
ae6d6489 LPC	422
5b9e048a LPC	423	#define AD799X_CHANNEL(_index, _realbits) \
	424	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
	425
	426	#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
	427	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
	428	ARRAY_SIZE(ad799x_events))
	429
985dbe77 MH	430	static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
985dbe77 MH	431	[ad7991] = {
7c626f58	432	.channel = {
5b9e048a LPC	433	AD799X_CHANNEL(0, 12),
	434	AD799X_CHANNEL(1, 12),
	435	AD799X_CHANNEL(2, 12),
	436	AD799X_CHANNEL(3, 12),
ae6d6489	437	IIO_CHAN_SOFT_TIMESTAMP(4),
7c626f58	438	},
d22fd9c5	439	.num_channels = 5,
6fe8135f	440	.info = &ad7991_info,
985dbe77 MH	441	},
985dbe77 MH	442	[ad7995] = {
7c626f58	443	.channel = {
5b9e048a LPC	444	AD799X_CHANNEL(0, 10),
	445	AD799X_CHANNEL(1, 10),
	446	AD799X_CHANNEL(2, 10),
	447	AD799X_CHANNEL(3, 10),
ae6d6489	448	IIO_CHAN_SOFT_TIMESTAMP(4),
7c626f58	449	},
d22fd9c5	450	.num_channels = 5,
6fe8135f	451	.info = &ad7991_info,
985dbe77 MH	452	},
985dbe77 MH	453	[ad7999] = {
7c626f58	454	.channel = {
5b9e048a LPC	455	AD799X_CHANNEL(0, 8),
	456	AD799X_CHANNEL(1, 8),
	457	AD799X_CHANNEL(2, 8),
	458	AD799X_CHANNEL(3, 8),
ae6d6489	459	IIO_CHAN_SOFT_TIMESTAMP(4),
7c626f58	460	},
d22fd9c5	461	.num_channels = 5,
6fe8135f	462	.info = &ad7991_info,
985dbe77 MH	463	},
985dbe77 MH	464	[ad7992] = {
7c626f58	465	.channel = {
5b9e048a LPC	466	AD799X_CHANNEL_WITH_EVENTS(0, 12),
5b9e048a LPC	467	AD799X_CHANNEL_WITH_EVENTS(1, 12),
ae6d6489	468	IIO_CHAN_SOFT_TIMESTAMP(3),
7c626f58	469	},
d22fd9c5	470	.num_channels = 3,
985dbe77	471	.default_config = AD7998_ALERT_EN,
ba1d7961	472	.info = &ad7993_4_7_8_info,
985dbe77 MH	473	},
985dbe77 MH	474	[ad7993] = {
7c626f58	475	.channel = {
5b9e048a LPC	476	AD799X_CHANNEL_WITH_EVENTS(0, 10),
	477	AD799X_CHANNEL_WITH_EVENTS(1, 10),
	478	AD799X_CHANNEL_WITH_EVENTS(2, 10),
	479	AD799X_CHANNEL_WITH_EVENTS(3, 10),
ae6d6489	480	IIO_CHAN_SOFT_TIMESTAMP(4),
7c626f58	481	},
d22fd9c5	482	.num_channels = 5,
985dbe77	483	.default_config = AD7998_ALERT_EN,
6fe8135f	484	.info = &ad7993_4_7_8_info,
985dbe77 MH	485	},
985dbe77 MH	486	[ad7994] = {
7c626f58	487	.channel = {
5b9e048a LPC	488	AD799X_CHANNEL_WITH_EVENTS(0, 12),
	489	AD799X_CHANNEL_WITH_EVENTS(1, 12),
	490	AD799X_CHANNEL_WITH_EVENTS(2, 12),
	491	AD799X_CHANNEL_WITH_EVENTS(3, 12),
ae6d6489	492	IIO_CHAN_SOFT_TIMESTAMP(4),
7c626f58	493	},
d22fd9c5	494	.num_channels = 5,
985dbe77	495	.default_config = AD7998_ALERT_EN,
6fe8135f	496	.info = &ad7993_4_7_8_info,
985dbe77 MH	497	},
985dbe77 MH	498	[ad7997] = {
7c626f58	499	.channel = {
5b9e048a LPC	500	AD799X_CHANNEL_WITH_EVENTS(0, 10),
	501	AD799X_CHANNEL_WITH_EVENTS(1, 10),
	502	AD799X_CHANNEL_WITH_EVENTS(2, 10),
	503	AD799X_CHANNEL_WITH_EVENTS(3, 10),
	504	AD799X_CHANNEL(4, 10),
	505	AD799X_CHANNEL(5, 10),
	506	AD799X_CHANNEL(6, 10),
	507	AD799X_CHANNEL(7, 10),
ae6d6489	508	IIO_CHAN_SOFT_TIMESTAMP(8),
7c626f58	509	},
d22fd9c5	510	.num_channels = 9,
985dbe77	511	.default_config = AD7998_ALERT_EN,
6fe8135f	512	.info = &ad7993_4_7_8_info,
985dbe77 MH	513	},
985dbe77 MH	514	[ad7998] = {
7c626f58	515	.channel = {
5b9e048a LPC	516	AD799X_CHANNEL_WITH_EVENTS(0, 12),
	517	AD799X_CHANNEL_WITH_EVENTS(1, 12),
	518	AD799X_CHANNEL_WITH_EVENTS(2, 12),
	519	AD799X_CHANNEL_WITH_EVENTS(3, 12),
	520	AD799X_CHANNEL(4, 12),
	521	AD799X_CHANNEL(5, 12),
	522	AD799X_CHANNEL(6, 12),
	523	AD799X_CHANNEL(7, 12),
ae6d6489	524	IIO_CHAN_SOFT_TIMESTAMP(8),
7c626f58	525	},
d22fd9c5	526	.num_channels = 9,
985dbe77	527	.default_config = AD7998_ALERT_EN,
6fe8135f	528	.info = &ad7993_4_7_8_info,
985dbe77 MH	529	},
	530	};
	531
4ae1c61f	532	static int ad799x_probe(struct i2c_client *client,
985dbe77 MH	533	const struct i2c_device_id *id)
985dbe77 MH	534	{
26d25ae3	535	int ret;
985dbe77	536	struct ad799x_platform_data *pdata = client->dev.platform_data;
1bf7ac76	537	struct ad799x_state *st;
6a88fa48	538	struct iio_dev *indio_dev;
1bf7ac76	539
6a88fa48	540	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
1bf7ac76 MH	541	if (indio_dev == NULL)
1bf7ac76 MH	542	return -ENOMEM;
985dbe77	543
1bf7ac76	544	st = iio_priv(indio_dev);
985dbe77	545	/* this is only used for device removal purposes */
1bf7ac76	546	i2c_set_clientdata(client, indio_dev);
985dbe77	547
985dbe77 MH	548	st->id = id->driver_data;
	549	st->chip_info = &ad799x_chip_info_tbl[st->id];
	550	st->config = st->chip_info->default_config;
	551
	552	/* TODO: Add pdata options for filtering and bit delay */
	553
8c7e8627 LPC	554	if (!pdata)
	555	return -EINVAL;
	556
	557	st->int_vref_mv = pdata->vref_mv;
985dbe77	558
6a88fa48	559	st->reg = devm_regulator_get(&client->dev, "vcc");
985dbe77 MH	560	if (!IS_ERR(st->reg)) {
	561	ret = regulator_enable(st->reg);
	562	if (ret)
6a88fa48	563	return ret;
985dbe77 MH	564	}
	565	st->client = client;
	566
1bf7ac76 MH	567	indio_dev->dev.parent = &client->dev;
1bf7ac76 MH	568	indio_dev->name = id->name;
6fe8135f	569	indio_dev->info = st->chip_info->info;
6fe8135f	570
1bf7ac76	571	indio_dev->modes = INDIO_DIRECT_MODE;
1bf7ac76 MH	572	indio_dev->channels = st->chip_info->channel;
1bf7ac76 MH	573	indio_dev->num_channels = st->chip_info->num_channels;
1bf7ac76 MH	574
1bf7ac76 MH	575	ret = ad799x_register_ring_funcs_and_init(indio_dev);
985dbe77	576	if (ret)
1bf7ac76	577	goto error_disable_reg;
985dbe77	578
6fe8135f	579	if (client->irq > 0) {
72148f6e JC	580	ret = request_threaded_irq(client->irq,
	581	NULL,
	582	ad799x_event_handler,
	583	IRQF_TRIGGER_FALLING \|
	584	IRQF_ONESHOT,
	585	client->name,
1bf7ac76	586	indio_dev);
985dbe77 MH	587	if (ret)
985dbe77 MH	588	goto error_cleanup_ring;
985dbe77	589	}
26d25ae3 JC	590	ret = iio_device_register(indio_dev);
	591	if (ret)
	592	goto error_free_irq;
985dbe77 MH	593
985dbe77 MH	594	return 0;
1bf7ac76	595
26d25ae3	596	error_free_irq:
38408d05 HK	597	if (client->irq > 0)
38408d05 HK	598	free_irq(client->irq, indio_dev);
985dbe77	599	error_cleanup_ring:
1bf7ac76	600	ad799x_ring_cleanup(indio_dev);
985dbe77 MH	601	error_disable_reg:
	602	if (!IS_ERR(st->reg))
	603	regulator_disable(st->reg);
1bf7ac76	604
985dbe77 MH	605	return ret;
	606	}
	607
447d4f29	608	static int ad799x_remove(struct i2c_client *client)
985dbe77	609	{
1bf7ac76 MH	610	struct iio_dev *indio_dev = i2c_get_clientdata(client);
1bf7ac76 MH	611	struct ad799x_state *st = iio_priv(indio_dev);
985dbe77	612
d2fffd6c	613	iio_device_unregister(indio_dev);
6fe8135f	614	if (client->irq > 0)
72148f6e	615	free_irq(client->irq, indio_dev);
985dbe77	616
985dbe77	617	ad799x_ring_cleanup(indio_dev);
6a88fa48	618	if (!IS_ERR(st->reg))
985dbe77	619	regulator_disable(st->reg);
d8dca330	620	kfree(st->rx_buf);
985dbe77 MH	621
	622	return 0;
	623	}
	624
	625	static const struct i2c_device_id ad799x_id[] = {
	626	{ "ad7991", ad7991 },
	627	{ "ad7995", ad7995 },
	628	{ "ad7999", ad7999 },
	629	{ "ad7992", ad7992 },
	630	{ "ad7993", ad7993 },
	631	{ "ad7994", ad7994 },
	632	{ "ad7997", ad7997 },
	633	{ "ad7998", ad7998 },
	634	{}
	635	};
	636
	637	MODULE_DEVICE_TABLE(i2c, ad799x_id);
	638
	639	static struct i2c_driver ad799x_driver = {
	640	.driver = {
	641	.name = "ad799x",
	642	},
	643	.probe = ad799x_probe,
e543acf0	644	.remove = ad799x_remove,
985dbe77 MH	645	.id_table = ad799x_id,
985dbe77 MH	646	};
6e5af184	647	module_i2c_driver(ad799x_driver);
985dbe77 MH	648
	649	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	650	MODULE_DESCRIPTION("Analog Devices AD799x ADC");
	651	MODULE_LICENSE("GPL v2");