iio: gyro: Add itg3200 (9dbf091d) · Commits · e / devices / android_kernel_sony_msm8998

drivers/iio/gyro/Kconfig

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Original line number	Diff line number	Diff line
		@@ -70,4 +70,12 @@ config IIO_ST_GYRO_SPI_3AXIS
		depends on IIO_ST_GYRO_3AXIS
		depends on IIO_ST_SENSORS_SPI

		config ITG3200
		tristate "InvenSense ITG3200 Digital 3-Axis Gyroscope I2C driver"
		depends on I2C
		select IIO_TRIGGERED_BUFFER if IIO_BUFFER
		help
		Say yes here to add support for the InvenSense ITG3200 digital
		3-axis gyroscope sensor.

		endmenu

drivers/iio/gyro/Makefile

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Original line number	Diff line number	Diff line
		@@ -8,6 +8,10 @@ obj-$(CONFIG_ADXRS450) += adxrs450.o

		obj-$(CONFIG_HID_SENSOR_GYRO_3D) += hid-sensor-gyro-3d.o

		itg3200-y := itg3200_core.o
		itg3200-$(CONFIG_IIO_BUFFER) += itg3200_buffer.o
		obj-$(CONFIG_ITG3200) += itg3200.o

		obj-$(CONFIG_IIO_ST_GYRO_3AXIS) += st_gyro.o
		st_gyro-y := st_gyro_core.o
		st_gyro-$(CONFIG_IIO_BUFFER) += st_gyro_buffer.o

drivers/iio/gyro/itg3200_buffer.c

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Original line number	Diff line number	Diff line
		/*
		* itg3200_buffer.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.
		*/

		#include <linux/slab.h>
		#include <linux/i2c.h>
		#include <linux/interrupt.h>

		#include <linux/iio/iio.h>
		#include <linux/iio/buffer.h>
		#include <linux/iio/trigger.h>
		#include <linux/iio/trigger_consumer.h>
		#include <linux/iio/triggered_buffer.h>
		#include <linux/iio/gyro/itg3200.h>


		static int itg3200_read_all_channels(struct i2c_client i2c, __be16 buf)
		{
		u8 tx = 0x80 \| ITG3200_REG_TEMP_OUT_H;
		struct i2c_msg msg[2] = {
		{
		.addr = i2c->addr,
		.flags = i2c->flags,
		.len = 1,
		.buf = &tx,
		},
		{
		.addr = i2c->addr,
		.flags = i2c->flags \| I2C_M_RD,
		.len = ITG3200_SCAN_ELEMENTS * sizeof(s16),
		.buf = (char *)&buf,
		},
		};

		return i2c_transfer(i2c->adapter, msg, 2);
		}

		static irqreturn_t itg3200_trigger_handler(int irq, void *p)
		{
		struct iio_poll_func *pf = p;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct itg3200 *st = iio_priv(indio_dev);
		__be16 buf[ITG3200_SCAN_ELEMENTS + sizeof(s64)/sizeof(u16)];

		int ret = itg3200_read_all_channels(st->i2c, buf);
		if (ret < 0)
		goto error_ret;

		if (indio_dev->scan_timestamp)
		memcpy(buf + indio_dev->scan_bytes - sizeof(s64),
		&pf->timestamp, sizeof(pf->timestamp));

		iio_push_to_buffers(indio_dev, (u8 *)buf);
		iio_trigger_notify_done(indio_dev->trig);

		error_ret:
		return IRQ_HANDLED;
		}

		int itg3200_buffer_configure(struct iio_dev *indio_dev)
		{
		return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
		itg3200_trigger_handler, NULL);
		}

		void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
		{
		iio_triggered_buffer_cleanup(indio_dev);
		}


		static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig,
		bool state)
		{
		struct iio_dev *indio_dev = trig->private_data;
		int ret;
		u8 msc;

		ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, &msc);
		if (ret)
		goto error_ret;

		if (state)
		msc \|= ITG3200_IRQ_DATA_RDY_ENABLE;
		else
		msc &= ~ITG3200_IRQ_DATA_RDY_ENABLE;

		ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, msc);
		if (ret)
		goto error_ret;

		error_ret:
		return ret;

		}

		static const struct iio_trigger_ops itg3200_trigger_ops = {
		.owner = THIS_MODULE,
		.set_trigger_state = &itg3200_data_rdy_trigger_set_state,
		};

		int itg3200_probe_trigger(struct iio_dev *indio_dev)
		{
		int ret;
		struct itg3200 *st = iio_priv(indio_dev);

		st->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
		indio_dev->id);
		if (!st->trig)
		return -ENOMEM;

		ret = request_irq(st->i2c->irq,
		&iio_trigger_generic_data_rdy_poll,
		IRQF_TRIGGER_RISING,
		"itg3200_data_rdy",
		st->trig);
		if (ret)
		goto error_free_trig;


		st->trig->dev.parent = &st->i2c->dev;
		st->trig->ops = &itg3200_trigger_ops;
		st->trig->private_data = indio_dev;
		ret = iio_trigger_register(st->trig);
		if (ret)
		goto error_free_irq;

		/* select default trigger */
		indio_dev->trig = st->trig;

		return 0;

		error_free_irq:
		free_irq(st->i2c->irq, st->trig);
		error_free_trig:
		iio_trigger_free(st->trig);
		return ret;
		}

		void itg3200_remove_trigger(struct iio_dev *indio_dev)
		{
		struct itg3200 *st = iio_priv(indio_dev);

		iio_trigger_unregister(st->trig);
		free_irq(st->i2c->irq, st->trig);
		iio_trigger_free(st->trig);
		}

drivers/iio/gyro/itg3200_core.c

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* 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_TEMP_INFO_MASK (IIO_CHAN_INFO_OFFSET_SHARED_BIT \| \
		IIO_CHAN_INFO_SCALE_SHARED_BIT \| \
		IIO_CHAN_INFO_RAW_SEPARATE_BIT)
		#define ITG3200_GYRO_INFO_MASK (IIO_CHAN_INFO_SCALE_SHARED_BIT \| \
		IIO_CHAN_INFO_RAW_SEPARATE_BIT)

		#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 = ITG3200_GYRO_INFO_MASK, \
		.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 = ITG3200_TEMP_INFO_MASK,
		.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 = iio_device_alloc(sizeof(*st));
		if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
		}

		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)
		goto error_free_dev;

		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);
		error_free_dev:
		iio_device_free(indio_dev);
		error_ret:
		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);

		iio_device_free(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");

include/linux/iio/gyro/itg3200.h

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* itg3200.h -- 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.
		*/

		#ifndef I2C_ITG3200_H_
		#define I2C_ITG3200_H_

		#include <linux/iio/iio.h>

		/* Register with I2C address (34h) */
		#define ITG3200_REG_ADDRESS 0x00

		/* Sample rate divider
		* Range: 0 to 255
		* Default value: 0x00 */
		#define ITG3200_REG_SAMPLE_RATE_DIV 0x15

		/* Digital low pass filter settings */
		#define ITG3200_REG_DLPF 0x16
		/* DLPF full scale range */
		#define ITG3200_DLPF_FS_SEL_2000 0x18
		/* Bandwidth (Hz) and internal sample rate
		* (kHz) of DLPF */
		#define ITG3200_DLPF_256_8 0x00
		#define ITG3200_DLPF_188_1 0x01
		#define ITG3200_DLPF_98_1 0x02
		#define ITG3200_DLPF_42_1 0x03
		#define ITG3200_DLPF_20_1 0x04
		#define ITG3200_DLPF_10_1 0x05
		#define ITG3200_DLPF_5_1 0x06

		#define ITG3200_DLPF_CFG_MASK 0x07

		/* Configuration for interrupt operations */
		#define ITG3200_REG_IRQ_CONFIG 0x17
		/* Logic level */
		#define ITG3200_IRQ_ACTIVE_LOW 0x80
		#define ITG3200_IRQ_ACTIVE_HIGH 0x00
		/* Drive type */
		#define ITG3200_IRQ_OPEN_DRAIN 0x40
		#define ITG3200_IRQ_PUSH_PULL 0x00
		/* Latch mode */
		#define ITG3200_IRQ_LATCH_UNTIL_CLEARED 0x20
		#define ITG3200_IRQ_LATCH_50US_PULSE 0x00
		/* Latch clear method */
		#define ITG3200_IRQ_LATCH_CLEAR_ANY 0x10
		#define ITG3200_IRQ_LATCH_CLEAR_STATUS 0x00
		/* Enable interrupt when device is ready */
		#define ITG3200_IRQ_DEVICE_RDY_ENABLE 0x04
		/* Enable interrupt when data is available */
		#define ITG3200_IRQ_DATA_RDY_ENABLE 0x01

		/* Determine the status of ITG-3200 interrupts */
		#define ITG3200_REG_IRQ_STATUS 0x1A
		/* Status of 'device is ready'-interrupt */
		#define ITG3200_IRQ_DEVICE_RDY_STATUS 0x04
		/* Status of 'data is available'-interrupt */
		#define ITG3200_IRQ_DATA_RDY_STATUS 0x01

		/* Sensor registers */
		#define ITG3200_REG_TEMP_OUT_H 0x1B
		#define ITG3200_REG_TEMP_OUT_L 0x1C
		#define ITG3200_REG_GYRO_XOUT_H 0x1D
		#define ITG3200_REG_GYRO_XOUT_L 0x1E
		#define ITG3200_REG_GYRO_YOUT_H 0x1F
		#define ITG3200_REG_GYRO_YOUT_L 0x20
		#define ITG3200_REG_GYRO_ZOUT_H 0x21
		#define ITG3200_REG_GYRO_ZOUT_L 0x22

		/* Power management */
		#define ITG3200_REG_POWER_MANAGEMENT 0x3E
		/* Reset device and internal registers to the
		* power-up-default settings */
		#define ITG3200_RESET 0x80
		/* Enable low power sleep mode */
		#define ITG3200_SLEEP 0x40
		/* Put according gyroscope in standby mode */
		#define ITG3200_STANDBY_GYRO_X 0x20
		#define ITG3200_STANDBY_GYRO_Y 0x10
		#define ITG3200_STANDBY_GYRO_Z 0x08
		/* Determine the device clock source */
		#define ITG3200_CLK_INTERNAL 0x00
		#define ITG3200_CLK_GYRO_X 0x01
		#define ITG3200_CLK_GYRO_Y 0x02
		#define ITG3200_CLK_GYRO_Z 0x03
		#define ITG3200_CLK_EXT_32K 0x04
		#define ITG3200_CLK_EXT_19M 0x05


		/**
		* struct itg3200 - device instance specific data
		* @i2c: actual i2c_client
		* @trig: data ready trigger from itg3200 pin
		**/
		struct itg3200 {
		struct i2c_client *i2c;
		struct iio_trigger *trig;
		};

		enum ITG3200_SCAN_INDEX {
		ITG3200_SCAN_TEMP,
		ITG3200_SCAN_GYRO_X,
		ITG3200_SCAN_GYRO_Y,
		ITG3200_SCAN_GYRO_Z,
		ITG3200_SCAN_ELEMENTS,
		};

		int itg3200_write_reg_8(struct iio_dev *indio_dev,
		u8 reg_address, u8 val);

		int itg3200_read_reg_8(struct iio_dev *indio_dev,
		u8 reg_address, u8 *val);


		#ifdef CONFIG_IIO_BUFFER

		void itg3200_remove_trigger(struct iio_dev *indio_dev);
		int itg3200_probe_trigger(struct iio_dev *indio_dev);

		int itg3200_buffer_configure(struct iio_dev *indio_dev);
		void itg3200_buffer_unconfigure(struct iio_dev *indio_dev);

		#else /* CONFIG_IIO_BUFFER */

		static inline void itg3200_remove_trigger(struct iio_dev *indio_dev)
		{
		}

		static inline int itg3200_probe_trigger(struct iio_dev *indio_dev)
		{
		return 0;
		}

		static inline int itg3200_buffer_configure(struct iio_dev *indio_dev)
		{
		return 0;
		}

		static inline void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
		{
		}

		#endif /* CONFIG_IIO_RING_BUFFER */

		#endif /* ITG3200_H_ */