[mirror_ubuntu-artful-kernel.git] / drivers / iio / gyro / itg3200_core.c

/*
 * itg3200_core.c -- support InvenSense ITG3200
 *                   Digital 3-Axis Gyroscope driver
 *
 * Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de>
 * Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
 * Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
 *
 * 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.
 *
 * TODO:
 * - Support digital low pass filter
 * - Support power management
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/module.h>
#include <linux/delay.h>

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

#include <linux/iio/gyro/itg3200.h>


int itg3200_write_reg_8(struct iio_dev *indio_dev,
		u8 reg_address, u8 val)
{
	struct itg3200 *st = iio_priv(indio_dev);

	return i2c_smbus_write_byte_data(st->i2c, 0x80 | reg_address, val);
}

int itg3200_read_reg_8(struct iio_dev *indio_dev,
		u8 reg_address, u8 *val)
{
	struct itg3200 *st = iio_priv(indio_dev);
	int ret;

	ret = i2c_smbus_read_byte_data(st->i2c, reg_address);
	if (ret < 0)
		return ret;
	*val = ret;
	return 0;
}

static int itg3200_read_reg_s16(struct iio_dev *indio_dev, u8 lower_reg_address,
		int *val)
{
	struct itg3200 *st = iio_priv(indio_dev);
	struct i2c_client *client = st->i2c;
	int ret;
	s16 out;

	struct i2c_msg msg[2] = {
		{
			.addr = client->addr,
			.flags = client->flags,
			.len = 1,
			.buf = (char *)&lower_reg_address,
		},
		{
			.addr = client->addr,
			.flags = client->flags | I2C_M_RD,
			.len = 2,
			.buf = (char *)&out,
		},
	};

	lower_reg_address |= 0x80;
	ret = i2c_transfer(client->adapter, msg, 2);
	be16_to_cpus(&out);
	*val = out;

	return (ret == 2) ? 0 : ret;
}

static int itg3200_read_raw(struct iio_dev *indio_dev,
		const struct iio_chan_spec *chan,
		int *val, int *val2, long info)
{
	int ret = 0;
	u8 reg;
	u8 regval;

	switch (info) {
	case IIO_CHAN_INFO_RAW:
		reg = (u8)chan->address;
		ret = itg3200_read_reg_s16(indio_dev, reg, val);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		if (chan->type == IIO_TEMP)
			*val2 = 1000000000/280;
		else
			*val2 = 1214142; /* (1 / 14,375) * (PI / 180) */
		return IIO_VAL_INT_PLUS_NANO;
	case IIO_CHAN_INFO_OFFSET:
		/* Only the temperature channel has an offset */
		*val = 23000;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &regval);
		if (ret)
			return ret;

		*val = (regval & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;

		ret = itg3200_read_reg_8(indio_dev,
					 ITG3200_REG_SAMPLE_RATE_DIV,
					 &regval);
		if (ret)
			return ret;

		*val /= regval + 1;
		return IIO_VAL_INT;

	default:
		return -EINVAL;
	}
}

static int itg3200_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val,
			     int val2,
			     long mask)
{
	int ret;
	u8 t;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		if (val == 0 || val2 != 0)
			return -EINVAL;

		mutex_lock(&indio_dev->mlock);

		ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &t);
		if (ret) {
			mutex_unlock(&indio_dev->mlock);
			return ret;
		}
		t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;

		ret = itg3200_write_reg_8(indio_dev,
					  ITG3200_REG_SAMPLE_RATE_DIV,
					  t);

		mutex_unlock(&indio_dev->mlock);
	return ret;

	default:
		return -EINVAL;
	}
}

/*
 * Reset device and internal registers to the power-up-default settings
 * Use the gyro clock as reference, as suggested by the datasheet
 */
static int itg3200_reset(struct iio_dev *indio_dev)
{
	struct itg3200 *st = iio_priv(indio_dev);
	int ret;

	dev_dbg(&st->i2c->dev, "reset device");

	ret = itg3200_write_reg_8(indio_dev,
			ITG3200_REG_POWER_MANAGEMENT,
			ITG3200_RESET);
	if (ret) {
		dev_err(&st->i2c->dev, "error resetting device");
		goto error_ret;
	}

	/* Wait for PLL (1ms according to datasheet) */
	udelay(1500);

	ret = itg3200_write_reg_8(indio_dev,
			ITG3200_REG_IRQ_CONFIG,
			ITG3200_IRQ_ACTIVE_HIGH |
			ITG3200_IRQ_PUSH_PULL |
			ITG3200_IRQ_LATCH_50US_PULSE |
			ITG3200_IRQ_LATCH_CLEAR_ANY);

	if (ret)
		dev_err(&st->i2c->dev, "error init device");

error_ret:
	return ret;
}

/* itg3200_enable_full_scale() - Disables the digital low pass filter */
static int itg3200_enable_full_scale(struct iio_dev *indio_dev)
{
	u8 val;
	int ret;

	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &val);
	if (ret)
		goto err_ret;

	val |= ITG3200_DLPF_FS_SEL_2000;
	return itg3200_write_reg_8(indio_dev, ITG3200_REG_DLPF, val);

err_ret:
	return ret;
}

static int itg3200_initial_setup(struct iio_dev *indio_dev)
{
	struct itg3200 *st = iio_priv(indio_dev);
	int ret;
	u8 val;

	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_ADDRESS, &val);
	if (ret)
		goto err_ret;

	if (((val >> 1) & 0x3f) != 0x34) {
		dev_err(&st->i2c->dev, "invalid reg value 0x%02x", val);
		ret = -ENXIO;
		goto err_ret;
	}

	ret = itg3200_reset(indio_dev);
	if (ret)
		goto err_ret;

	ret = itg3200_enable_full_scale(indio_dev);
err_ret:
	return ret;
}

#define ITG3200_ST						\
	{ .sign = 's', .realbits = 16, .storagebits = 16, .endianness = IIO_BE }

#define ITG3200_GYRO_CHAN(_mod) { \
	.type = IIO_ANGL_VEL, \
	.modified = 1, \
	.channel2 = IIO_MOD_ ## _mod, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
	.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
	.scan_type = ITG3200_ST, \
}

static const struct iio_chan_spec itg3200_channels[] = {
	{
		.type = IIO_TEMP,
		.channel2 = IIO_NO_MOD,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
		BIT(IIO_CHAN_INFO_SCALE),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
		.address = ITG3200_REG_TEMP_OUT_H,
		.scan_index = ITG3200_SCAN_TEMP,
		.scan_type = ITG3200_ST,
	},
	ITG3200_GYRO_CHAN(X),
	ITG3200_GYRO_CHAN(Y),
	ITG3200_GYRO_CHAN(Z),
	IIO_CHAN_SOFT_TIMESTAMP(ITG3200_SCAN_ELEMENTS),
};

static const struct iio_info itg3200_info = {
	.read_raw = &itg3200_read_raw,
	.write_raw = &itg3200_write_raw,
	.driver_module = THIS_MODULE,
};

static const unsigned long itg3200_available_scan_masks[] = { 0xffffffff, 0x0 };

static int itg3200_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	int ret;
	struct itg3200 *st;
	struct iio_dev *indio_dev;

	dev_dbg(&client->dev, "probe I2C dev with IRQ %i", client->irq);

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

	st = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);
	st->i2c = client;

	indio_dev->dev.parent = &client->dev;
	indio_dev->name = client->dev.driver->name;
	indio_dev->channels = itg3200_channels;
	indio_dev->num_channels = ARRAY_SIZE(itg3200_channels);
	indio_dev->available_scan_masks = itg3200_available_scan_masks;
	indio_dev->info = &itg3200_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = itg3200_buffer_configure(indio_dev);
	if (ret)
		return ret;

	if (client->irq) {
		ret = itg3200_probe_trigger(indio_dev);
		if (ret)
			goto error_unconfigure_buffer;
	}

	ret = itg3200_initial_setup(indio_dev);
	if (ret)
		goto error_remove_trigger;

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

	return 0;

error_remove_trigger:
	if (client->irq)
		itg3200_remove_trigger(indio_dev);
error_unconfigure_buffer:
	itg3200_buffer_unconfigure(indio_dev);
	return ret;
}

static int itg3200_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);

	if (client->irq)
		itg3200_remove_trigger(indio_dev);

	itg3200_buffer_unconfigure(indio_dev);

	return 0;
}

static const struct i2c_device_id itg3200_id[] = {
	{ "itg3200", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, itg3200_id);

static struct i2c_driver itg3200_driver = {
	.driver = {
		.owner  = THIS_MODULE,
		.name	= "itg3200",
	},
	.id_table	= itg3200_id,
	.probe		= itg3200_probe,
	.remove		= itg3200_remove,
};

module_i2c_driver(itg3200_driver);

MODULE_AUTHOR("Christian Strobel <christian.strobel@iis.fraunhofer.de>");
MODULE_DESCRIPTION("ITG3200 Gyroscope I2C driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
9dbf091d MS	1	/*
	2	* itg3200_core.c -- support InvenSense ITG3200
	3	* Digital 3-Axis Gyroscope driver
	4	*
	5	* Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de>
	6	* Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
	7	* Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* TODO:
	14	* - Support digital low pass filter
	15	* - Support power management
	16	*/
	17
	18	#include <linux/interrupt.h>
	19	#include <linux/irq.h>
	20	#include <linux/i2c.h>
	21	#include <linux/gpio.h>
	22	#include <linux/slab.h>
	23	#include <linux/stat.h>
	24	#include <linux/module.h>
	25	#include <linux/delay.h>
	26
	27	#include <linux/iio/iio.h>
	28	#include <linux/iio/sysfs.h>
	29	#include <linux/iio/events.h>
	30	#include <linux/iio/buffer.h>
	31
	32	#include <linux/iio/gyro/itg3200.h>
	33
	34
	35	int itg3200_write_reg_8(struct iio_dev *indio_dev,
	36	u8 reg_address, u8 val)
	37	{
	38	struct itg3200 *st = iio_priv(indio_dev);
	39
	40	return i2c_smbus_write_byte_data(st->i2c, 0x80 \| reg_address, val);
	41	}
	42
	43	int itg3200_read_reg_8(struct iio_dev *indio_dev,
	44	u8 reg_address, u8 *val)
	45	{
	46	struct itg3200 *st = iio_priv(indio_dev);
	47	int ret;
	48
	49	ret = i2c_smbus_read_byte_data(st->i2c, reg_address);
	50	if (ret < 0)
	51	return ret;
	52	*val = ret;
	53	return 0;
	54	}
	55
	56	static int itg3200_read_reg_s16(struct iio_dev *indio_dev, u8 lower_reg_address,
	57	int *val)
	58	{
	59	struct itg3200 *st = iio_priv(indio_dev);
	60	struct i2c_client *client = st->i2c;
	61	int ret;
	62	s16 out;
	63
	64	struct i2c_msg msg[2] = {
65	{
66	.addr = client->addr,
67	.flags = client->flags,
68	.len = 1,
69	.buf = (char *)&lower_reg_address,
70	},
71	{
72	.addr = client->addr,
73	.flags = client->flags \| I2C_M_RD,
74	.len = 2,
75	.buf = (char *)&out,
76	},
77	};
78
79	lower_reg_address \|= 0x80;
80	ret = i2c_transfer(client->adapter, msg, 2);
81	be16_to_cpus(&out);
82	*val = out;
83
84	return (ret == 2) ? 0 : ret;
85	}
86
87	static int itg3200_read_raw(struct iio_dev *indio_dev,
88	const struct iio_chan_spec *chan,
89	int val, int val2, long info)
90	{
91	int ret = 0;
92	u8 reg;
95bb8918	93	u8 regval;
9dbf091d MS	94
	95	switch (info) {
	96	case IIO_CHAN_INFO_RAW:
	97	reg = (u8)chan->address;
	98	ret = itg3200_read_reg_s16(indio_dev, reg, val);
	99	return IIO_VAL_INT;
	100	case IIO_CHAN_INFO_SCALE:
	101	*val = 0;
	102	if (chan->type == IIO_TEMP)
	103	*val2 = 1000000000/280;
	104	else
	105	val2 = 1214142; / (1 / 14,375) * (PI / 180) */
	106	return IIO_VAL_INT_PLUS_NANO;
	107	case IIO_CHAN_INFO_OFFSET:
	108	/* Only the temperature channel has an offset */
	109	*val = 23000;
	110	return IIO_VAL_INT;
95bb8918 JC	111	case IIO_CHAN_INFO_SAMP_FREQ:
	112	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &regval);
	113	if (ret)
	114	return ret;
9dbf091d	115
95bb8918	116	*val = (regval & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;
9dbf091d	117
95bb8918 JC	118	ret = itg3200_read_reg_8(indio_dev,
	119	ITG3200_REG_SAMPLE_RATE_DIV,
	120	&regval);
	121	if (ret)
	122	return ret;
9dbf091d	123
95bb8918 JC	124	*val /= regval + 1;
95bb8918 JC	125	return IIO_VAL_INT;
9dbf091d	126
95bb8918 JC	127	default:
	128	return -EINVAL;
	129	}
9dbf091d MS	130	}
9dbf091d MS	131
95bb8918 JC	132	static int itg3200_write_raw(struct iio_dev *indio_dev,
	133	struct iio_chan_spec const *chan,
	134	int val,
	135	int val2,
	136	long mask)
9dbf091d	137	{
9dbf091d MS	138	int ret;
	139	u8 t;
	140
95bb8918 JC	141	switch (mask) {
	142	case IIO_CHAN_INFO_SAMP_FREQ:
	143	if (val == 0 \|\| val2 != 0)
	144	return -EINVAL;
9dbf091d	145
95bb8918	146	mutex_lock(&indio_dev->mlock);
9dbf091d	147
95bb8918 JC	148	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &t);
	149	if (ret) {
	150	mutex_unlock(&indio_dev->mlock);
	151	return ret;
	152	}
	153	t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;
9dbf091d	154
95bb8918 JC	155	ret = itg3200_write_reg_8(indio_dev,
	156	ITG3200_REG_SAMPLE_RATE_DIV,
	157	t);
9dbf091d	158
95bb8918 JC	159	mutex_unlock(&indio_dev->mlock);
95bb8918 JC	160	return ret;
9dbf091d	161
95bb8918 JC	162	default:
	163	return -EINVAL;
	164	}
9dbf091d MS	165	}
	166
	167	/*
	168	* Reset device and internal registers to the power-up-default settings
	169	* Use the gyro clock as reference, as suggested by the datasheet
	170	*/
	171	static int itg3200_reset(struct iio_dev *indio_dev)
	172	{
	173	struct itg3200 *st = iio_priv(indio_dev);
	174	int ret;
	175
	176	dev_dbg(&st->i2c->dev, "reset device");
	177
	178	ret = itg3200_write_reg_8(indio_dev,
	179	ITG3200_REG_POWER_MANAGEMENT,
	180	ITG3200_RESET);
	181	if (ret) {
	182	dev_err(&st->i2c->dev, "error resetting device");
	183	goto error_ret;
	184	}
	185
	186	/* Wait for PLL (1ms according to datasheet) */
	187	udelay(1500);
	188
	189	ret = itg3200_write_reg_8(indio_dev,
	190	ITG3200_REG_IRQ_CONFIG,
	191	ITG3200_IRQ_ACTIVE_HIGH \|
	192	ITG3200_IRQ_PUSH_PULL \|
	193	ITG3200_IRQ_LATCH_50US_PULSE \|
	194	ITG3200_IRQ_LATCH_CLEAR_ANY);
	195
	196	if (ret)
	197	dev_err(&st->i2c->dev, "error init device");
	198
	199	error_ret:
	200	return ret;
	201	}
	202
	203	/* itg3200_enable_full_scale() - Disables the digital low pass filter */
	204	static int itg3200_enable_full_scale(struct iio_dev *indio_dev)
	205	{
	206	u8 val;
	207	int ret;
	208
	209	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &val);
	210	if (ret)
	211	goto err_ret;
	212
	213	val \|= ITG3200_DLPF_FS_SEL_2000;
	214	return itg3200_write_reg_8(indio_dev, ITG3200_REG_DLPF, val);
	215
	216	err_ret:
	217	return ret;
	218	}
	219
	220	static int itg3200_initial_setup(struct iio_dev *indio_dev)
	221	{
	222	struct itg3200 *st = iio_priv(indio_dev);
	223	int ret;
	224	u8 val;
	225
	226	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_ADDRESS, &val);
	227	if (ret)
	228	goto err_ret;
229
230	if (((val >> 1) & 0x3f) != 0x34) {
231	dev_err(&st->i2c->dev, "invalid reg value 0x%02x", val);
232	ret = -ENXIO;
233	goto err_ret;
234	}
235
236	ret = itg3200_reset(indio_dev);
237	if (ret)
238	goto err_ret;
239
240	ret = itg3200_enable_full_scale(indio_dev);
241	err_ret:
242	return ret;
243	}
244
9dbf091d MS	245	#define ITG3200_ST \
	246	{ .sign = 's', .realbits = 16, .storagebits = 16, .endianness = IIO_BE }
	247
	248	#define ITG3200_GYRO_CHAN(_mod) { \
	249	.type = IIO_ANGL_VEL, \
	250	.modified = 1, \
	251	.channel2 = IIO_MOD_ ## _mod, \
e1865aa1 JC	252	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
e1865aa1 JC	253	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
95bb8918	254	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
9dbf091d MS	255	.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
	256	.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
	257	.scan_type = ITG3200_ST, \
	258	}
	259
	260	static const struct iio_chan_spec itg3200_channels[] = {
	261	{
	262	.type = IIO_TEMP,
	263	.channel2 = IIO_NO_MOD,
e1865aa1 JC	264	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	265	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	266	BIT(IIO_CHAN_INFO_SCALE),
95bb8918	267	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
9dbf091d MS	268	.address = ITG3200_REG_TEMP_OUT_H,
	269	.scan_index = ITG3200_SCAN_TEMP,
	270	.scan_type = ITG3200_ST,
	271	},
	272	ITG3200_GYRO_CHAN(X),
	273	ITG3200_GYRO_CHAN(Y),
	274	ITG3200_GYRO_CHAN(Z),
	275	IIO_CHAN_SOFT_TIMESTAMP(ITG3200_SCAN_ELEMENTS),
	276	};
	277
9dbf091d	278	static const struct iio_info itg3200_info = {
9dbf091d	279	.read_raw = &itg3200_read_raw,
95bb8918	280	.write_raw = &itg3200_write_raw,
9dbf091d MS	281	.driver_module = THIS_MODULE,
	282	};
	283
	284	static const unsigned long itg3200_available_scan_masks[] = { 0xffffffff, 0x0 };
	285
	286	static int itg3200_probe(struct i2c_client *client,
	287	const struct i2c_device_id *id)
	288	{
	289	int ret;
	290	struct itg3200 *st;
	291	struct iio_dev *indio_dev;
	292
	293	dev_dbg(&client->dev, "probe I2C dev with IRQ %i", client->irq);
	294
d243b3c0 SK	295	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
	296	if (!indio_dev)
	297	return -ENOMEM;
9dbf091d MS	298
	299	st = iio_priv(indio_dev);
	300
	301	i2c_set_clientdata(client, indio_dev);
	302	st->i2c = client;
	303
	304	indio_dev->dev.parent = &client->dev;
	305	indio_dev->name = client->dev.driver->name;
	306	indio_dev->channels = itg3200_channels;
	307	indio_dev->num_channels = ARRAY_SIZE(itg3200_channels);
	308	indio_dev->available_scan_masks = itg3200_available_scan_masks;
	309	indio_dev->info = &itg3200_info;
	310	indio_dev->modes = INDIO_DIRECT_MODE;
	311
	312	ret = itg3200_buffer_configure(indio_dev);
	313	if (ret)
d243b3c0	314	return ret;
9dbf091d MS	315
	316	if (client->irq) {
	317	ret = itg3200_probe_trigger(indio_dev);
	318	if (ret)
	319	goto error_unconfigure_buffer;
	320	}
	321
	322	ret = itg3200_initial_setup(indio_dev);
	323	if (ret)
	324	goto error_remove_trigger;
	325
	326	ret = iio_device_register(indio_dev);
	327	if (ret)
	328	goto error_remove_trigger;
	329
	330	return 0;
	331
	332	error_remove_trigger:
	333	if (client->irq)
	334	itg3200_remove_trigger(indio_dev);
	335	error_unconfigure_buffer:
	336	itg3200_buffer_unconfigure(indio_dev);
9dbf091d MS	337	return ret;
	338	}
	339
	340	static int itg3200_remove(struct i2c_client *client)
	341	{
	342	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	343
	344	iio_device_unregister(indio_dev);
	345
	346	if (client->irq)
	347	itg3200_remove_trigger(indio_dev);
	348
	349	itg3200_buffer_unconfigure(indio_dev);
	350
9dbf091d MS	351	return 0;
	352	}
	353
	354	static const struct i2c_device_id itg3200_id[] = {
	355	{ "itg3200", 0 },
	356	{ }
	357	};
	358	MODULE_DEVICE_TABLE(i2c, itg3200_id);
	359
	360	static struct i2c_driver itg3200_driver = {
	361	.driver = {
	362	.owner = THIS_MODULE,
	363	.name = "itg3200",
	364	},
	365	.id_table = itg3200_id,
	366	.probe = itg3200_probe,
	367	.remove = itg3200_remove,
	368	};
	369
	370	module_i2c_driver(itg3200_driver);
	371
	372	MODULE_AUTHOR("Christian Strobel <christian.strobel@iis.fraunhofer.de>");
	373	MODULE_DESCRIPTION("ITG3200 Gyroscope I2C driver");
	374	MODULE_LICENSE("GPL v2");