[linux-block.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;

	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;
	default:
		return -EINVAL;
	}

	return ret;
}

static ssize_t itg3200_read_frequency(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	int ret, sps;
	u8 val;

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

	sps = (val & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;

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

	sps /= val + 1;

	return sprintf(buf, "%d\n", sps);
}

static ssize_t itg3200_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);
	unsigned val;
	int ret;
	u8 t;

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

	mutex_lock(&indio_dev->mlock);

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

	if (val == 0) {
		ret = -EINVAL;
		goto err_ret;
	}
	t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;

	ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_SAMPLE_RATE_DIV, t);

err_ret:
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
}

/*
 * 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), \
	.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),
		.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),
};

/* IIO device attributes */
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, itg3200_read_frequency,
		itg3200_write_frequency);

static struct attribute *itg3200_attributes[] = {
	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	NULL
};

static const struct attribute_group itg3200_attribute_group = {
	.attrs = itg3200_attributes,
};

static const struct iio_info itg3200_info = {
	.attrs = &itg3200_attribute_group,
	.read_raw = &itg3200_read_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;
93
94	switch (info) {
95	case IIO_CHAN_INFO_RAW:
96	reg = (u8)chan->address;
97	ret = itg3200_read_reg_s16(indio_dev, reg, val);
98	return IIO_VAL_INT;
99	case IIO_CHAN_INFO_SCALE:
100	*val = 0;
101	if (chan->type == IIO_TEMP)
102	*val2 = 1000000000/280;
103	else
104	val2 = 1214142; / (1 / 14,375) * (PI / 180) */
105	return IIO_VAL_INT_PLUS_NANO;
106	case IIO_CHAN_INFO_OFFSET:
107	/* Only the temperature channel has an offset */
108	*val = 23000;
109	return IIO_VAL_INT;
110	default:
111	return -EINVAL;
112	}
113
114	return ret;
115	}
116
117	static ssize_t itg3200_read_frequency(struct device *dev,
118	struct device_attribute attr, char buf)
119	{
120	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
121	int ret, sps;
122	u8 val;
123
124	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &val);
125	if (ret)
126	return ret;
127
128	sps = (val & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;
129
130	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_SAMPLE_RATE_DIV, &val);
131	if (ret)
132	return ret;
133
134	sps /= val + 1;
135
136	return sprintf(buf, "%d\n", sps);
137	}
138
139	static ssize_t itg3200_write_frequency(struct device *dev,
140	struct device_attribute *attr,
141	const char *buf,
142	size_t len)
143	{
144	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
145	unsigned val;
146	int ret;
147	u8 t;
148
149	ret = kstrtouint(buf, 10, &val);
150	if (ret)
151	return ret;
152
153	mutex_lock(&indio_dev->mlock);
154
155	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &t);
156	if (ret)
157	goto err_ret;
158
159	if (val == 0) {
160	ret = -EINVAL;
161	goto err_ret;
162	}
163	t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;
164
165	ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_SAMPLE_RATE_DIV, t);
166
167	err_ret:
168	mutex_unlock(&indio_dev->mlock);
169
170	return ret ? ret : len;
171	}
172
173	/*
174	* Reset device and internal registers to the power-up-default settings
175	* Use the gyro clock as reference, as suggested by the datasheet
176	*/
177	static int itg3200_reset(struct iio_dev *indio_dev)
178	{
179	struct itg3200 *st = iio_priv(indio_dev);
180	int ret;
181
182	dev_dbg(&st->i2c->dev, "reset device");
183
184	ret = itg3200_write_reg_8(indio_dev,
185	ITG3200_REG_POWER_MANAGEMENT,
186	ITG3200_RESET);
187	if (ret) {
188	dev_err(&st->i2c->dev, "error resetting device");
189	goto error_ret;
190	}
191
192	/* Wait for PLL (1ms according to datasheet) */
193	udelay(1500);
194
195	ret = itg3200_write_reg_8(indio_dev,
196	ITG3200_REG_IRQ_CONFIG,
197	ITG3200_IRQ_ACTIVE_HIGH \|
198	ITG3200_IRQ_PUSH_PULL \|
199	ITG3200_IRQ_LATCH_50US_PULSE \|
200	ITG3200_IRQ_LATCH_CLEAR_ANY);
201
202	if (ret)
203	dev_err(&st->i2c->dev, "error init device");
204
205	error_ret:
206	return ret;
207	}
208
209	/* itg3200_enable_full_scale() - Disables the digital low pass filter */
210	static int itg3200_enable_full_scale(struct iio_dev *indio_dev)
211	{
212	u8 val;
213	int ret;
214
215	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &val);
216	if (ret)
217	goto err_ret;
218
219	val \|= ITG3200_DLPF_FS_SEL_2000;
220	return itg3200_write_reg_8(indio_dev, ITG3200_REG_DLPF, val);
221
222	err_ret:
223	return ret;
224	}
225
226	static int itg3200_initial_setup(struct iio_dev *indio_dev)
227	{
228	struct itg3200 *st = iio_priv(indio_dev);
229	int ret;
230	u8 val;
231
232	ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_ADDRESS, &val);
233	if (ret)
234	goto err_ret;
235
236	if (((val >> 1) & 0x3f) != 0x34) {
237	dev_err(&st->i2c->dev, "invalid reg value 0x%02x", val);
238	ret = -ENXIO;
239	goto err_ret;
240	}
241
242	ret = itg3200_reset(indio_dev);
243	if (ret)
244	goto err_ret;
245
246	ret = itg3200_enable_full_scale(indio_dev);
247	err_ret:
248	return ret;
249	}
250
9dbf091d MS	251	#define ITG3200_ST \
	252	{ .sign = 's', .realbits = 16, .storagebits = 16, .endianness = IIO_BE }
	253
	254	#define ITG3200_GYRO_CHAN(_mod) { \
	255	.type = IIO_ANGL_VEL, \
	256	.modified = 1, \
	257	.channel2 = IIO_MOD_ ## _mod, \
e1865aa1 JC	258	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
e1865aa1 JC	259	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
9dbf091d MS	260	.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
	261	.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
	262	.scan_type = ITG3200_ST, \
	263	}
	264
	265	static const struct iio_chan_spec itg3200_channels[] = {
	266	{
	267	.type = IIO_TEMP,
	268	.channel2 = IIO_NO_MOD,
e1865aa1 JC	269	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	270	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	271	BIT(IIO_CHAN_INFO_SCALE),
9dbf091d MS	272	.address = ITG3200_REG_TEMP_OUT_H,
	273	.scan_index = ITG3200_SCAN_TEMP,
	274	.scan_type = ITG3200_ST,
	275	},
	276	ITG3200_GYRO_CHAN(X),
	277	ITG3200_GYRO_CHAN(Y),
	278	ITG3200_GYRO_CHAN(Z),
	279	IIO_CHAN_SOFT_TIMESTAMP(ITG3200_SCAN_ELEMENTS),
	280	};
	281
	282	/* IIO device attributes */
	283	static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR \| S_IRUGO, itg3200_read_frequency,
	284	itg3200_write_frequency);
	285
	286	static struct attribute *itg3200_attributes[] = {
	287	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	288	NULL
	289	};
	290
	291	static const struct attribute_group itg3200_attribute_group = {
	292	.attrs = itg3200_attributes,
	293	};
	294
	295	static const struct iio_info itg3200_info = {
	296	.attrs = &itg3200_attribute_group,
	297	.read_raw = &itg3200_read_raw,
	298	.driver_module = THIS_MODULE,
	299	};
	300
	301	static const unsigned long itg3200_available_scan_masks[] = { 0xffffffff, 0x0 };
	302
	303	static int itg3200_probe(struct i2c_client *client,
	304	const struct i2c_device_id *id)
	305	{
	306	int ret;
	307	struct itg3200 *st;
	308	struct iio_dev *indio_dev;
	309
	310	dev_dbg(&client->dev, "probe I2C dev with IRQ %i", client->irq);
	311
d243b3c0 SK	312	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
	313	if (!indio_dev)
	314	return -ENOMEM;
9dbf091d MS	315
	316	st = iio_priv(indio_dev);
	317
	318	i2c_set_clientdata(client, indio_dev);
	319	st->i2c = client;
	320
	321	indio_dev->dev.parent = &client->dev;
	322	indio_dev->name = client->dev.driver->name;
	323	indio_dev->channels = itg3200_channels;
	324	indio_dev->num_channels = ARRAY_SIZE(itg3200_channels);
	325	indio_dev->available_scan_masks = itg3200_available_scan_masks;
	326	indio_dev->info = &itg3200_info;
	327	indio_dev->modes = INDIO_DIRECT_MODE;
	328
	329	ret = itg3200_buffer_configure(indio_dev);
	330	if (ret)
d243b3c0	331	return ret;
9dbf091d MS	332
	333	if (client->irq) {
	334	ret = itg3200_probe_trigger(indio_dev);
	335	if (ret)
	336	goto error_unconfigure_buffer;
	337	}
	338
	339	ret = itg3200_initial_setup(indio_dev);
	340	if (ret)
	341	goto error_remove_trigger;
	342
	343	ret = iio_device_register(indio_dev);
	344	if (ret)
	345	goto error_remove_trigger;
	346
	347	return 0;
	348
	349	error_remove_trigger:
	350	if (client->irq)
	351	itg3200_remove_trigger(indio_dev);
	352	error_unconfigure_buffer:
	353	itg3200_buffer_unconfigure(indio_dev);
9dbf091d MS	354	return ret;
	355	}
	356
	357	static int itg3200_remove(struct i2c_client *client)
	358	{
	359	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	360
	361	iio_device_unregister(indio_dev);
	362
	363	if (client->irq)
	364	itg3200_remove_trigger(indio_dev);
	365
	366	itg3200_buffer_unconfigure(indio_dev);
	367
9dbf091d MS	368	return 0;
	369	}
	370
	371	static const struct i2c_device_id itg3200_id[] = {
	372	{ "itg3200", 0 },
	373	{ }
	374	};
	375	MODULE_DEVICE_TABLE(i2c, itg3200_id);
	376
	377	static struct i2c_driver itg3200_driver = {
	378	.driver = {
	379	.owner = THIS_MODULE,
	380	.name = "itg3200",
	381	},
	382	.id_table = itg3200_id,
	383	.probe = itg3200_probe,
	384	.remove = itg3200_remove,
	385	};
	386
	387	module_i2c_driver(itg3200_driver);
	388
	389	MODULE_AUTHOR("Christian Strobel <christian.strobel@iis.fraunhofer.de>");
	390	MODULE_DESCRIPTION("ITG3200 Gyroscope I2C driver");
	391	MODULE_LICENSE("GPL v2");