drivers/staging/iio/gyro/adxrs450_core.c - kernel/mindspeed - Git at Google

 /*
  * ADXRS450 Digital Output Gyroscope Driver
  *
  * Copyright 2011 Analog Devices Inc.
  *
  * Licensed under the GPL-2.
  */

 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 #include <linux/module.h>

 #include "../iio.h"
 #include "../sysfs.h"

 #include "adxrs450.h"

 /**
  * adxrs450_spi_read_reg_16() - read 2 bytes from a register pair
  * @dev: device associated with child of actual iio_dev
  * @reg_address: the address of the lower of the two registers,which should be an even address,
  * Second register's address is reg_address + 1.
  * @val: somewhere to pass back the value read
  **/
 static int adxrs450_spi_read_reg_16(struct iio_dev *indio_dev,
 				    u8 reg_address,
 				    u16 *val)
 {
 	struct adxrs450_state *st = iio_priv(indio_dev);
 	int ret;

 	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADXRS450_READ_DATA | (reg_address >> 7);
 	st->tx[1] = reg_address << 1;
 	st->tx[2] = 0;
 	st->tx[3] = 0;

 	if (!(hweight32(be32_to_cpu(*(u32 *)st->tx)) & 1))
 		st->tx[3]  |= ADXRS450_P;

 	ret = spi_write(st->us, st->tx, 4);
 	if (ret) {
 		dev_err(&st->us->dev, "problem while reading 16 bit register 0x%02x\n",
 			reg_address);
 		goto error_ret;
 	}
 	ret = spi_read(st->us, st->rx, 4);
 	if (ret) {
 		dev_err(&st->us->dev, "problem while reading 16 bit register 0x%02x\n",
 				reg_address);
 		goto error_ret;
 	}

 	*val = (be32_to_cpu(*(u32 *)st->rx) >> 5) & 0xFFFF;

 error_ret:
 	mutex_unlock(&st->buf_lock);
 	return ret;
 }

 /**
  * adxrs450_spi_write_reg_16() - write 2 bytes data to a register pair
  * @dev: device associated with child of actual actual iio_dev
  * @reg_address: the address of the lower of the two registers,which should be an even address,
  * Second register's address is reg_address + 1.
  * @val: value to be written.
  **/
 static int adxrs450_spi_write_reg_16(struct iio_dev *indio_dev,
 				     u8 reg_address,
 				     u16 val)
 {
 	struct adxrs450_state *st = iio_priv(indio_dev);
 	int ret;

 	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADXRS450_WRITE_DATA | reg_address >> 7;
 	st->tx[1] = reg_address << 1 | val >> 15;
 	st->tx[2] = val >> 7;
 	st->tx[3] = val << 1;

 	if (!(hweight32(be32_to_cpu(*(u32 *)st->tx)) & 1))
 		st->tx[3] |= ADXRS450_P;

 	ret = spi_write(st->us, st->tx, 4);
 	if (ret)
 		dev_err(&st->us->dev, "problem while writing 16 bit register 0x%02x\n",
 			reg_address);
 	msleep(1); /* enforce sequential transfer delay 0.1ms */
 	mutex_unlock(&st->buf_lock);
 	return ret;
 }

 /**
  * adxrs450_spi_sensor_data() - read 2 bytes sensor data
  * @dev: device associated with child of actual iio_dev
  * @val: somewhere to pass back the value read
  **/
 static int adxrs450_spi_sensor_data(struct iio_dev *indio_dev, s16 *val)
 {
 	struct adxrs450_state *st = iio_priv(indio_dev);
 	int ret;

 	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADXRS450_SENSOR_DATA;
 	st->tx[1] = 0;
 	st->tx[2] = 0;
 	st->tx[3] = 0;

 	ret = spi_write(st->us, st->tx, 4);
 	if (ret) {
 		dev_err(&st->us->dev, "Problem while reading sensor data\n");
 		goto error_ret;
 	}

 	ret = spi_read(st->us, st->rx, 4);
 	if (ret) {
 		dev_err(&st->us->dev, "Problem while reading sensor data\n");
 		goto error_ret;
 	}

 	*val = (be32_to_cpu(*(u32 *)st->rx) >> 10) & 0xFFFF;

 error_ret:
 	mutex_unlock(&st->buf_lock);
 	return ret;
 }

 /**
  * adxrs450_spi_initial() - use for initializing procedure.
  * @st: device instance specific data
  * @val: somewhere to pass back the value read
  **/
 static int adxrs450_spi_initial(struct adxrs450_state *st,
 		u32 *val, char chk)
 {
 	struct spi_message msg;
 	int ret;
 	struct spi_transfer xfers = {
 		.tx_buf = st->tx,
 		.rx_buf = st->rx,
 		.bits_per_word = 8,
 		.len = 4,
 	};

 	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADXRS450_SENSOR_DATA;
 	st->tx[1] = 0;
 	st->tx[2] = 0;
 	st->tx[3] = 0;
 	if (chk)
 		st->tx[3] |= (ADXRS450_CHK | ADXRS450_P);
 	spi_message_init(&msg);
 	spi_message_add_tail(&xfers, &msg);
 	ret = spi_sync(st->us, &msg);
 	if (ret) {
 		dev_err(&st->us->dev, "Problem while reading initializing data\n");
 		goto error_ret;
 	}

 	*val = be32_to_cpu(*(u32 *)st->rx);

 error_ret:
 	mutex_unlock(&st->buf_lock);
 	return ret;
 }

 /* Recommended Startup Sequence by spec */
 static int adxrs450_initial_setup(struct iio_dev *indio_dev)
 {
 	u32 t;
 	u16 data;
 	int ret;
 	struct adxrs450_state *st = iio_priv(indio_dev);

 	msleep(ADXRS450_STARTUP_DELAY*2);
 	ret = adxrs450_spi_initial(st, &t, 1);
 	if (ret)
 		return ret;
 	if (t != 0x01)
 		dev_warn(&st->us->dev, "The initial power on response "
 			 "is not correct! Restart without reset?\n");

 	msleep(ADXRS450_STARTUP_DELAY);
 	ret = adxrs450_spi_initial(st, &t, 0);
 	if (ret)
 		return ret;

 	msleep(ADXRS450_STARTUP_DELAY);
 	ret = adxrs450_spi_initial(st, &t, 0);
 	if (ret)
 		return ret;
 	if (((t & 0xff) | 0x01) != 0xff || ADXRS450_GET_ST(t) != 2) {
 		dev_err(&st->us->dev, "The second response is not correct!\n");
 		return -EIO;

 	}
 	ret = adxrs450_spi_initial(st, &t, 0);
 	if (ret)
 		return ret;
 	if (((t & 0xff) | 0x01) != 0xff || ADXRS450_GET_ST(t) != 2) {
 		dev_err(&st->us->dev, "The third response is not correct!\n");
 		return -EIO;

 	}
 	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_FAULT1, &data);
 	if (ret)
 		return ret;
 	if (data & 0x0fff) {
 		dev_err(&st->us->dev, "The device is not in normal status!\n");
 		return -EINVAL;
 	}
 	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_PID1, &data);
 	if (ret)
 		return ret;
 	dev_info(&st->us->dev, "The Part ID is 0x%x\n", data);

 	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_SNL, &data);
 	if (ret)
 		return ret;
 	t = data;
 	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_SNH, &data);
 	if (ret)
 		return ret;
 	t |= data << 16;
 	dev_info(&st->us->dev, "The Serial Number is 0x%x\n", t);

 	return 0;
 }

 static int adxrs450_write_raw(struct iio_dev *indio_dev,
 			      struct iio_chan_spec const *chan,
 			      int val,
 			      int val2,
 			      long mask)
 {
 	int ret;
 	switch (mask) {
 	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
 		ret = adxrs450_spi_write_reg_16(indio_dev,
 						ADXRS450_DNC1,
 						val & 0x3FF);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static int adxrs450_read_raw(struct iio_dev *indio_dev,
 			     struct iio_chan_spec const *chan,
 			     int *val,
 			     int *val2,
 			     long mask)
 {
 	int ret;
 	s16 t;
 	u16 ut;
 	switch (mask) {
 	case 0:
 		switch (chan->type) {
 		case IIO_ANGL_VEL:
 			ret = adxrs450_spi_sensor_data(indio_dev, &t);
 			if (ret)
 				break;
 			*val = t;
 			ret = IIO_VAL_INT;
 			break;
 		case IIO_TEMP:
 			ret = adxrs450_spi_read_reg_16(indio_dev,
 						       ADXRS450_TEMP1, &ut);
 			if (ret)
 				break;
 			*val = ut;
 			ret = IIO_VAL_INT;
 			break;
 		default:
 			ret = -EINVAL;
 			break;
 		}
 		break;
 	case (1 << IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE):
 		ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_QUAD1, &t);
 		if (ret)
 			break;
 		*val = t;
 		ret = IIO_VAL_INT;
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static const struct iio_chan_spec adxrs450_channels[] = {
 	{
 		.type = IIO_ANGL_VEL,
 		.modified = 1,
 		.channel2 = IIO_MOD_Z,
 		.info_mask = (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
 		(1 << IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE)
 	}, {
 		.type = IIO_TEMP,
 		.indexed = 1,
 		.channel = 0,
 	}
 };

 static const struct iio_info adxrs450_info = {
 	.driver_module = THIS_MODULE,
 	.read_raw = &adxrs450_read_raw,
 	.write_raw = &adxrs450_write_raw,
 };

 static int __devinit adxrs450_probe(struct spi_device *spi)
 {
 	int ret;
 	struct adxrs450_state *st;
 	struct iio_dev *indio_dev;

 	/* setup the industrialio driver allocated elements */
 	indio_dev = iio_allocate_device(sizeof(*st));
 	if (indio_dev == NULL) {
 		ret = -ENOMEM;
 		goto error_ret;
 	}
 	st = iio_priv(indio_dev);
 	st->us = spi;
 	mutex_init(&st->buf_lock);
 	/* This is only used for removal purposes */
 	spi_set_drvdata(spi, indio_dev);

 	indio_dev->dev.parent = &spi->dev;
 	indio_dev->info = &adxrs450_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = adxrs450_channels;
 	indio_dev->num_channels = ARRAY_SIZE(adxrs450_channels);
 	indio_dev->name = spi->dev.driver->name;

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

 	/* Get the device into a sane initial state */
 	ret = adxrs450_initial_setup(indio_dev);
 	if (ret)
 		goto error_initial;
 	return 0;
 error_initial:
 	iio_device_unregister(indio_dev);
 error_free_dev:
 	iio_free_device(indio_dev);

 error_ret:
 	return ret;
 }

 static int adxrs450_remove(struct spi_device *spi)
 {
 	iio_device_unregister(spi_get_drvdata(spi));
 	iio_free_device(spi_get_drvdata(spi));

 	return 0;
 }

 static struct spi_driver adxrs450_driver = {
 	.driver = {
 		.name = "adxrs450",
 		.owner = THIS_MODULE,
 	},
 	.probe = adxrs450_probe,
 	.remove = __devexit_p(adxrs450_remove),
 };

 static __init int adxrs450_init(void)
 {
 	return spi_register_driver(&adxrs450_driver);
 }
 module_init(adxrs450_init);

 static __exit void adxrs450_exit(void)
 {
 	spi_unregister_driver(&adxrs450_driver);
 }
 module_exit(adxrs450_exit);

 MODULE_AUTHOR("Cliff Cai <cliff.cai@xxxxxxxxxx>");
 MODULE_DESCRIPTION("Analog Devices ADXRS450 Gyroscope SPI driver");
 MODULE_LICENSE("GPL v2");
	/*
	* ADXRS450 Digital Output Gyroscope Driver
	*
	* Copyright 2011 Analog Devices Inc.
	*
	* Licensed under the GPL-2.
	*/

	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/delay.h>
	#include <linux/mutex.h>
	#include <linux/device.h>
	#include <linux/kernel.h>
	#include <linux/spi/spi.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/list.h>
	#include <linux/module.h>

	#include "../iio.h"
	#include "../sysfs.h"

	#include "adxrs450.h"

	/**
	* adxrs450_spi_read_reg_16() - read 2 bytes from a register pair
	* @dev: device associated with child of actual iio_dev
	* @reg_address: the address of the lower of the two registers,which should be an even address,
	* Second register's address is reg_address + 1.
	* @val: somewhere to pass back the value read
	**/
	static int adxrs450_spi_read_reg_16(struct iio_dev *indio_dev,
	u8 reg_address,
	u16 *val)
	{
	struct adxrs450_state *st = iio_priv(indio_dev);
	int ret;

	mutex_lock(&st->buf_lock);
	st->tx[0] = ADXRS450_READ_DATA \| (reg_address >> 7);
	st->tx[1] = reg_address << 1;
	st->tx[2] = 0;
	st->tx[3] = 0;

	if (!(hweight32(be32_to_cpu((u32 )st->tx)) & 1))
	st->tx[3] \|= ADXRS450_P;

	ret = spi_write(st->us, st->tx, 4);
	if (ret) {
	dev_err(&st->us->dev, "problem while reading 16 bit register 0x%02x\n",
	reg_address);
	goto error_ret;
	}
	ret = spi_read(st->us, st->rx, 4);
	if (ret) {
	dev_err(&st->us->dev, "problem while reading 16 bit register 0x%02x\n",
	reg_address);
	goto error_ret;
	}

	val = (be32_to_cpu((u32 *)st->rx) >> 5) & 0xFFFF;

	error_ret:
	mutex_unlock(&st->buf_lock);
	return ret;
	}

	/**
	* adxrs450_spi_write_reg_16() - write 2 bytes data to a register pair
	* @dev: device associated with child of actual actual iio_dev
	* @reg_address: the address of the lower of the two registers,which should be an even address,
	* Second register's address is reg_address + 1.
	* @val: value to be written.
	**/
	static int adxrs450_spi_write_reg_16(struct iio_dev *indio_dev,
	u8 reg_address,
	u16 val)
	{
	struct adxrs450_state *st = iio_priv(indio_dev);
	int ret;

	mutex_lock(&st->buf_lock);
	st->tx[0] = ADXRS450_WRITE_DATA \| reg_address >> 7;
	st->tx[1] = reg_address << 1 \| val >> 15;
	st->tx[2] = val >> 7;
	st->tx[3] = val << 1;

	if (!(hweight32(be32_to_cpu((u32 )st->tx)) & 1))
	st->tx[3] \|= ADXRS450_P;

	ret = spi_write(st->us, st->tx, 4);
	if (ret)
	dev_err(&st->us->dev, "problem while writing 16 bit register 0x%02x\n",
	reg_address);
	msleep(1); /* enforce sequential transfer delay 0.1ms */
	mutex_unlock(&st->buf_lock);
	return ret;
	}

	/**
	* adxrs450_spi_sensor_data() - read 2 bytes sensor data
	* @dev: device associated with child of actual iio_dev
	* @val: somewhere to pass back the value read
	**/
	static int adxrs450_spi_sensor_data(struct iio_dev indio_dev, s16 val)
	{
	struct adxrs450_state *st = iio_priv(indio_dev);
	int ret;

	mutex_lock(&st->buf_lock);
	st->tx[0] = ADXRS450_SENSOR_DATA;
	st->tx[1] = 0;
	st->tx[2] = 0;
	st->tx[3] = 0;

	ret = spi_write(st->us, st->tx, 4);
	if (ret) {
	dev_err(&st->us->dev, "Problem while reading sensor data\n");
	goto error_ret;
	}

	ret = spi_read(st->us, st->rx, 4);
	if (ret) {
	dev_err(&st->us->dev, "Problem while reading sensor data\n");
	goto error_ret;
	}

	val = (be32_to_cpu((u32 *)st->rx) >> 10) & 0xFFFF;

	error_ret:
	mutex_unlock(&st->buf_lock);
	return ret;
	}

	/**
	* adxrs450_spi_initial() - use for initializing procedure.
	* @st: device instance specific data
	* @val: somewhere to pass back the value read
	**/
	static int adxrs450_spi_initial(struct adxrs450_state *st,
	u32 *val, char chk)
	{
	struct spi_message msg;
	int ret;
	struct spi_transfer xfers = {
	.tx_buf = st->tx,
	.rx_buf = st->rx,
	.bits_per_word = 8,
	.len = 4,
	};

	mutex_lock(&st->buf_lock);
	st->tx[0] = ADXRS450_SENSOR_DATA;
	st->tx[1] = 0;
	st->tx[2] = 0;
	st->tx[3] = 0;
	if (chk)
	st->tx[3] \|= (ADXRS450_CHK \| ADXRS450_P);
	spi_message_init(&msg);
	spi_message_add_tail(&xfers, &msg);
	ret = spi_sync(st->us, &msg);
	if (ret) {
	dev_err(&st->us->dev, "Problem while reading initializing data\n");
	goto error_ret;
	}

	val = be32_to_cpu((u32 *)st->rx);

	error_ret:
	mutex_unlock(&st->buf_lock);
	return ret;
	}

	/* Recommended Startup Sequence by spec */
	static int adxrs450_initial_setup(struct iio_dev *indio_dev)
	{
	u32 t;
	u16 data;
	int ret;
	struct adxrs450_state *st = iio_priv(indio_dev);

	msleep(ADXRS450_STARTUP_DELAY*2);
	ret = adxrs450_spi_initial(st, &t, 1);
	if (ret)
	return ret;
	if (t != 0x01)
	dev_warn(&st->us->dev, "The initial power on response "
	"is not correct! Restart without reset?\n");

	msleep(ADXRS450_STARTUP_DELAY);
	ret = adxrs450_spi_initial(st, &t, 0);
	if (ret)
	return ret;

	msleep(ADXRS450_STARTUP_DELAY);
	ret = adxrs450_spi_initial(st, &t, 0);
	if (ret)
	return ret;
	if (((t & 0xff) \| 0x01) != 0xff \|\| ADXRS450_GET_ST(t) != 2) {
	dev_err(&st->us->dev, "The second response is not correct!\n");
	return -EIO;

	}
	ret = adxrs450_spi_initial(st, &t, 0);
	if (ret)
	return ret;
	if (((t & 0xff) \| 0x01) != 0xff \|\| ADXRS450_GET_ST(t) != 2) {
	dev_err(&st->us->dev, "The third response is not correct!\n");
	return -EIO;

	}
	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_FAULT1, &data);
	if (ret)
	return ret;
	if (data & 0x0fff) {
	dev_err(&st->us->dev, "The device is not in normal status!\n");
	return -EINVAL;
	}
	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_PID1, &data);
	if (ret)
	return ret;
	dev_info(&st->us->dev, "The Part ID is 0x%x\n", data);

	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_SNL, &data);
	if (ret)
	return ret;
	t = data;
	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_SNH, &data);
	if (ret)
	return ret;
	t \|= data << 16;
	dev_info(&st->us->dev, "The Serial Number is 0x%x\n", t);

	return 0;
	}

	static int adxrs450_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val,
	int val2,
	long mask)
	{
	int ret;
	switch (mask) {
	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
	ret = adxrs450_spi_write_reg_16(indio_dev,
	ADXRS450_DNC1,
	val & 0x3FF);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static int adxrs450_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int *val,
	int *val2,
	long mask)
	{
	int ret;
	s16 t;
	u16 ut;
	switch (mask) {
	case 0:
	switch (chan->type) {
	case IIO_ANGL_VEL:
	ret = adxrs450_spi_sensor_data(indio_dev, &t);
	if (ret)
	break;
	*val = t;
	ret = IIO_VAL_INT;
	break;
	case IIO_TEMP:
	ret = adxrs450_spi_read_reg_16(indio_dev,
	ADXRS450_TEMP1, &ut);
	if (ret)
	break;
	*val = ut;
	ret = IIO_VAL_INT;
	break;
	default:
	ret = -EINVAL;
	break;
	}
	break;
	case (1 << IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE):
	ret = adxrs450_spi_read_reg_16(indio_dev, ADXRS450_QUAD1, &t);
	if (ret)
	break;
	*val = t;
	ret = IIO_VAL_INT;
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static const struct iio_chan_spec adxrs450_channels[] = {
	{
	.type = IIO_ANGL_VEL,
	.modified = 1,
	.channel2 = IIO_MOD_Z,
	.info_mask = (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) \|
	(1 << IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE)
	}, {
	.type = IIO_TEMP,
	.indexed = 1,
	.channel = 0,
	}
	};

	static const struct iio_info adxrs450_info = {
	.driver_module = THIS_MODULE,
	.read_raw = &adxrs450_read_raw,
	.write_raw = &adxrs450_write_raw,
	};

	static int __devinit adxrs450_probe(struct spi_device *spi)
	{
	int ret;
	struct adxrs450_state *st;
	struct iio_dev *indio_dev;

	/* setup the industrialio driver allocated elements */
	indio_dev = iio_allocate_device(sizeof(*st));
	if (indio_dev == NULL) {
	ret = -ENOMEM;
	goto error_ret;
	}
	st = iio_priv(indio_dev);
	st->us = spi;
	mutex_init(&st->buf_lock);
	/* This is only used for removal purposes */
	spi_set_drvdata(spi, indio_dev);

	indio_dev->dev.parent = &spi->dev;
	indio_dev->info = &adxrs450_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = adxrs450_channels;
	indio_dev->num_channels = ARRAY_SIZE(adxrs450_channels);
	indio_dev->name = spi->dev.driver->name;

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

	/* Get the device into a sane initial state */
	ret = adxrs450_initial_setup(indio_dev);
	if (ret)
	goto error_initial;
	return 0;
	error_initial:
	iio_device_unregister(indio_dev);
	error_free_dev:
	iio_free_device(indio_dev);

	error_ret:
	return ret;
	}

	static int adxrs450_remove(struct spi_device *spi)
	{
	iio_device_unregister(spi_get_drvdata(spi));
	iio_free_device(spi_get_drvdata(spi));

	return 0;
	}

	static struct spi_driver adxrs450_driver = {
	.driver = {
	.name = "adxrs450",
	.owner = THIS_MODULE,
	},
	.probe = adxrs450_probe,
	.remove = __devexit_p(adxrs450_remove),
	};

	static __init int adxrs450_init(void)
	{
	return spi_register_driver(&adxrs450_driver);
	}
	module_init(adxrs450_init);

	static __exit void adxrs450_exit(void)
	{
	spi_unregister_driver(&adxrs450_driver);
	}
	module_exit(adxrs450_exit);

	MODULE_AUTHOR("Cliff Cai <cliff.cai@xxxxxxxxxx>");
	MODULE_DESCRIPTION("Analog Devices ADXRS450 Gyroscope SPI driver");
	MODULE_LICENSE("GPL v2");