[linux-2.6-block.git] / drivers / hwmon / lis3lv02d.c

/*
 *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
 *
 *  Copyright (C) 2007-2008 Yan Burman
 *  Copyright (C) 2008 Eric Piel
 *  Copyright (C) 2008 Pavel Machek
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/kthread.h>
#include <linux/semaphore.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/freezer.h>
#include <linux/uaccess.h>
#include <acpi/acpi_drivers.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"

#define DRIVER_NAME     "lis3lv02d"

/* joystick device poll interval in milliseconds */
#define MDPS_POLL_INTERVAL 50
/*
 * The sensor can also generate interrupts (DRDY) but it's pretty pointless
 * because their are generated even if the data do not change. So it's better
 * to keep the interrupt for the free-fall event. The values are updated at
 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
 * some low processor, we poll the sensor only at 20Hz... enough for the
 * joystick.
 */

/* Maximum value our axis may get for the input device (signed 12 bits) */
#define MDPS_MAX_VAL 2048

struct acpi_lis3lv02d adev;
EXPORT_SYMBOL_GPL(adev);

static int lis3lv02d_add_fs(struct acpi_device *device);

static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
{
	u8 lo, hi;

	adev.read(handle, reg, &lo);
	adev.read(handle, reg + 1, &hi);
	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
	return (s16)((hi << 8) | lo);
}

/**
 * lis3lv02d_get_axis - For the given axis, give the value converted
 * @axis:      1,2,3 - can also be negative
 * @hw_values: raw values returned by the hardware
 *
 * Returns the converted value.
 */
static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
{
	if (axis > 0)
		return hw_values[axis - 1];
	else
		return -hw_values[-axis - 1];
}

/**
 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 * @handle: the handle to the device
 * @x:      where to store the X axis value
 * @y:      where to store the Y axis value
 * @z:      where to store the Z axis value
 *
 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 */
static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
{
	int position[3];

	position[0] = lis3lv02d_read_16(handle, OUTX_L);
	position[1] = lis3lv02d_read_16(handle, OUTY_L);
	position[2] = lis3lv02d_read_16(handle, OUTZ_L);

	*x = lis3lv02d_get_axis(adev.ac.x, position);
	*y = lis3lv02d_get_axis(adev.ac.y, position);
	*z = lis3lv02d_get_axis(adev.ac.z, position);
}

void lis3lv02d_poweroff(acpi_handle handle)
{
	adev.is_on = 0;
	/* disable X,Y,Z axis and power down */
	adev.write(handle, CTRL_REG1, 0x00);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);

void lis3lv02d_poweron(acpi_handle handle)
{
	u8 val;

	adev.is_on = 1;
	adev.init(handle);
	adev.write(handle, FF_WU_CFG, 0);
	/*
	 * BDU: LSB and MSB values are not updated until both have been read.
	 *      So the value read will always be correct.
	 * IEN: Interrupt for free-fall and DD, not for data-ready.
	 */
	adev.read(handle, CTRL_REG2, &val);
	val |= CTRL2_BDU | CTRL2_IEN;
	adev.write(handle, CTRL_REG2, val);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);

/*
 * To be called before starting to use the device. It makes sure that the
 * device will always be on until a call to lis3lv02d_decrease_use(). Not to be
 * used from interrupt context.
 */
static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
{
	mutex_lock(&dev->lock);
	dev->usage++;
	if (dev->usage == 1) {
		if (!dev->is_on)
			lis3lv02d_poweron(dev->device->handle);
	}
	mutex_unlock(&dev->lock);
}

/*
 * To be called whenever a usage of the device is stopped.
 * It will make sure to turn off the device when there is not usage.
 */
static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
{
	mutex_lock(&dev->lock);
	dev->usage--;
	if (dev->usage == 0)
		lis3lv02d_poweroff(dev->device->handle);
	mutex_unlock(&dev->lock);
}

/**
 * lis3lv02d_joystick_kthread - Kthread polling function
 * @data: unused - here to conform to threadfn prototype
 */
static int lis3lv02d_joystick_kthread(void *data)
{
	int x, y, z;

	while (!kthread_should_stop()) {
		lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
		input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
		input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
		input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);

		input_sync(adev.idev);

		try_to_freeze();
		msleep_interruptible(MDPS_POLL_INTERVAL);
	}

	return 0;
}

static int lis3lv02d_joystick_open(struct input_dev *input)
{
	lis3lv02d_increase_use(&adev);
	adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
	if (IS_ERR(adev.kthread)) {
		lis3lv02d_decrease_use(&adev);
		return PTR_ERR(adev.kthread);
	}

	return 0;
}

static void lis3lv02d_joystick_close(struct input_dev *input)
{
	kthread_stop(adev.kthread);
	lis3lv02d_decrease_use(&adev);
}


static inline void lis3lv02d_calibrate_joystick(void)
{
	lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
}

int lis3lv02d_joystick_enable(void)
{
	int err;

	if (adev.idev)
		return -EINVAL;

	adev.idev = input_allocate_device();
	if (!adev.idev)
		return -ENOMEM;

	lis3lv02d_calibrate_joystick();

	adev.idev->name       = "ST LIS3LV02DL Accelerometer";
	adev.idev->phys       = DRIVER_NAME "/input0";
	adev.idev->id.bustype = BUS_HOST;
	adev.idev->id.vendor  = 0;
	adev.idev->dev.parent = &adev.pdev->dev;
	adev.idev->open       = lis3lv02d_joystick_open;
	adev.idev->close      = lis3lv02d_joystick_close;

	set_bit(EV_ABS, adev.idev->evbit);
	input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);

	err = input_register_device(adev.idev);
	if (err) {
		input_free_device(adev.idev);
		adev.idev = NULL;
	}

	return err;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);

void lis3lv02d_joystick_disable(void)
{
	if (!adev.idev)
		return;

	input_unregister_device(adev.idev);
	adev.idev = NULL;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);

/*
 * Initialise the accelerometer and the various subsystems.
 * Should be rather independant of the bus system.
 */
int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
{
	mutex_init(&dev->lock);
	lis3lv02d_add_fs(dev->device);
	lis3lv02d_increase_use(dev);

	if (lis3lv02d_joystick_enable())
		printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");

	lis3lv02d_decrease_use(dev);
	return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_init_device);

/* Sysfs stuff */
static ssize_t lis3lv02d_position_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int x, y, z;

	lis3lv02d_increase_use(&adev);
	lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
	lis3lv02d_decrease_use(&adev);
	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
}

static ssize_t lis3lv02d_calibrate_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
}

static ssize_t lis3lv02d_calibrate_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	lis3lv02d_increase_use(&adev);
	lis3lv02d_calibrate_joystick();
	lis3lv02d_decrease_use(&adev);
	return count;
}

/* conversion btw sampling rate and the register values */
static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
static ssize_t lis3lv02d_rate_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	u8 ctrl;
	int val;

	lis3lv02d_increase_use(&adev);
	adev.read(adev.device->handle, CTRL_REG1, &ctrl);
	lis3lv02d_decrease_use(&adev);
	val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
	return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
}

static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
	lis3lv02d_calibrate_store);
static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);

static struct attribute *lis3lv02d_attributes[] = {
	&dev_attr_position.attr,
	&dev_attr_calibrate.attr,
	&dev_attr_rate.attr,
	NULL
};

static struct attribute_group lis3lv02d_attribute_group = {
	.attrs = lis3lv02d_attributes
};


static int lis3lv02d_add_fs(struct acpi_device *device)
{
	adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	if (IS_ERR(adev.pdev))
		return PTR_ERR(adev.pdev);

	return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
}

int lis3lv02d_remove_fs(void)
{
	sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
	platform_device_unregister(adev.pdev);
	return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);

MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
MODULE_AUTHOR("Yan Burman and Eric Piel");
MODULE_LICENSE("GPL");
Commit	Line	Data
455fbdd3 PM	1	/*
	2	* lis3lv02d.c - ST LIS3LV02DL accelerometer driver
	3	*
	4	* Copyright (C) 2007-2008 Yan Burman
	5	* Copyright (C) 2008 Eric Piel
cfce41a6	6	* Copyright (C) 2008 Pavel Machek
455fbdd3 PM	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/init.h>
	25	#include <linux/dmi.h>
	26	#include <linux/module.h>
	27	#include <linux/types.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/input.h>
	31	#include <linux/kthread.h>
	32	#include <linux/semaphore.h>
	33	#include <linux/delay.h>
	34	#include <linux/wait.h>
	35	#include <linux/poll.h>
	36	#include <linux/freezer.h>
455fbdd3 PM	37	#include <linux/uaccess.h>
	38	#include <acpi/acpi_drivers.h>
	39	#include <asm/atomic.h>
	40	#include "lis3lv02d.h"
	41
	42	#define DRIVER_NAME "lis3lv02d"
455fbdd3 PM	43
	44	/* joystick device poll interval in milliseconds */
	45	#define MDPS_POLL_INTERVAL 50
	46	/*
	47	* The sensor can also generate interrupts (DRDY) but it's pretty pointless
	48	* because their are generated even if the data do not change. So it's better
	49	* to keep the interrupt for the free-fall event. The values are updated at
	50	* 40Hz (at the lowest frequency), but as it can be pretty time consuming on
	51	* some low processor, we poll the sensor only at 20Hz... enough for the
	52	* joystick.
	53	*/
	54
	55	/* Maximum value our axis may get for the input device (signed 12 bits) */
	56	#define MDPS_MAX_VAL 2048
	57
cfce41a6 EP	58	struct acpi_lis3lv02d adev;
cfce41a6 EP	59	EXPORT_SYMBOL_GPL(adev);
455fbdd3	60
455fbdd3 PM	61	static int lis3lv02d_add_fs(struct acpi_device *device);
455fbdd3 PM	62
455fbdd3 PM	63	static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
	64	{
	65	u8 lo, hi;
	66
cfce41a6 EP	67	adev.read(handle, reg, &lo);
cfce41a6 EP	68	adev.read(handle, reg + 1, &hi);
455fbdd3 PM	69	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
	70	return (s16)((hi << 8) \| lo);
	71	}
	72
	73	/**
	74	* lis3lv02d_get_axis - For the given axis, give the value converted
	75	* @axis: 1,2,3 - can also be negative
	76	* @hw_values: raw values returned by the hardware
	77	*
	78	* Returns the converted value.
	79	*/
	80	static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
	81	{
	82	if (axis > 0)
	83	return hw_values[axis - 1];
	84	else
	85	return -hw_values[-axis - 1];
	86	}
	87
	88	/**
	89	* lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
	90	* @handle: the handle to the device
	91	* @x: where to store the X axis value
	92	* @y: where to store the Y axis value
	93	* @z: where to store the Z axis value
	94	*
	95	* Note that 40Hz input device can eat up about 10% CPU at 800MHZ
	96	*/
	97	static void lis3lv02d_get_xyz(acpi_handle handle, int x, int y, int *z)
	98	{
	99	int position[3];
	100
	101	position[0] = lis3lv02d_read_16(handle, OUTX_L);
	102	position[1] = lis3lv02d_read_16(handle, OUTY_L);
	103	position[2] = lis3lv02d_read_16(handle, OUTZ_L);
	104
	105	*x = lis3lv02d_get_axis(adev.ac.x, position);
	106	*y = lis3lv02d_get_axis(adev.ac.y, position);
	107	*z = lis3lv02d_get_axis(adev.ac.z, position);
	108	}
	109
cfce41a6	110	void lis3lv02d_poweroff(acpi_handle handle)
455fbdd3 PM	111	{
	112	adev.is_on = 0;
	113	/* disable X,Y,Z axis and power down */
cfce41a6	114	adev.write(handle, CTRL_REG1, 0x00);
455fbdd3	115	}
cfce41a6	116	EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
455fbdd3	117
cfce41a6	118	void lis3lv02d_poweron(acpi_handle handle)
455fbdd3 PM	119	{
	120	u8 val;
	121
	122	adev.is_on = 1;
cfce41a6 EP	123	adev.init(handle);
cfce41a6 EP	124	adev.write(handle, FF_WU_CFG, 0);
455fbdd3 PM	125	/*
	126	* BDU: LSB and MSB values are not updated until both have been read.
	127	* So the value read will always be correct.
	128	* IEN: Interrupt for free-fall and DD, not for data-ready.
	129	*/
cfce41a6	130	adev.read(handle, CTRL_REG2, &val);
455fbdd3	131	val \|= CTRL2_BDU \| CTRL2_IEN;
cfce41a6	132	adev.write(handle, CTRL_REG2, val);
455fbdd3	133	}
cfce41a6	134	EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
455fbdd3 PM	135
	136	/*
	137	* To be called before starting to use the device. It makes sure that the
	138	* device will always be on until a call to lis3lv02d_decrease_use(). Not to be
	139	* used from interrupt context.
	140	*/
	141	static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
	142	{
	143	mutex_lock(&dev->lock);
	144	dev->usage++;
	145	if (dev->usage == 1) {
	146	if (!dev->is_on)
	147	lis3lv02d_poweron(dev->device->handle);
	148	}
	149	mutex_unlock(&dev->lock);
	150	}
	151
	152	/*
	153	* To be called whenever a usage of the device is stopped.
	154	* It will make sure to turn off the device when there is not usage.
	155	*/
	156	static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
	157	{
	158	mutex_lock(&dev->lock);
	159	dev->usage--;
	160	if (dev->usage == 0)
	161	lis3lv02d_poweroff(dev->device->handle);
	162	mutex_unlock(&dev->lock);
	163	}
	164
	165	/**
	166	* lis3lv02d_joystick_kthread - Kthread polling function
	167	* @data: unused - here to conform to threadfn prototype
	168	*/
	169	static int lis3lv02d_joystick_kthread(void *data)
	170	{
	171	int x, y, z;
	172
	173	while (!kthread_should_stop()) {
	174	lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
	175	input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
	176	input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
	177	input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);
	178
	179	input_sync(adev.idev);
	180
	181	try_to_freeze();
	182	msleep_interruptible(MDPS_POLL_INTERVAL);
	183	}
	184
	185	return 0;
	186	}
	187
	188	static int lis3lv02d_joystick_open(struct input_dev *input)
	189	{
	190	lis3lv02d_increase_use(&adev);
	191	adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
	192	if (IS_ERR(adev.kthread)) {
	193	lis3lv02d_decrease_use(&adev);
	194	return PTR_ERR(adev.kthread);
	195	}
	196
	197	return 0;
	198	}
199
200	static void lis3lv02d_joystick_close(struct input_dev *input)
201	{
202	kthread_stop(adev.kthread);
203	lis3lv02d_decrease_use(&adev);
204	}
205
206
207	static inline void lis3lv02d_calibrate_joystick(void)
208	{
209	lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
210	}
211
cfce41a6	212	int lis3lv02d_joystick_enable(void)
455fbdd3 PM	213	{
	214	int err;
	215
	216	if (adev.idev)
	217	return -EINVAL;
	218
	219	adev.idev = input_allocate_device();
	220	if (!adev.idev)
	221	return -ENOMEM;
	222
	223	lis3lv02d_calibrate_joystick();
	224
	225	adev.idev->name = "ST LIS3LV02DL Accelerometer";
	226	adev.idev->phys = DRIVER_NAME "/input0";
	227	adev.idev->id.bustype = BUS_HOST;
	228	adev.idev->id.vendor = 0;
	229	adev.idev->dev.parent = &adev.pdev->dev;
	230	adev.idev->open = lis3lv02d_joystick_open;
	231	adev.idev->close = lis3lv02d_joystick_close;
	232
	233	set_bit(EV_ABS, adev.idev->evbit);
	234	input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	235	input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	236	input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	237
	238	err = input_register_device(adev.idev);
	239	if (err) {
	240	input_free_device(adev.idev);
	241	adev.idev = NULL;
	242	}
	243
	244	return err;
	245	}
cfce41a6	246	EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
455fbdd3	247
cfce41a6	248	void lis3lv02d_joystick_disable(void)
455fbdd3 PM	249	{
	250	if (!adev.idev)
	251	return;
	252
	253	input_unregister_device(adev.idev);
	254	adev.idev = NULL;
	255	}
cfce41a6	256	EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
455fbdd3 PM	257
	258	/*
	259	* Initialise the accelerometer and the various subsystems.
	260	* Should be rather independant of the bus system.
	261	*/
cfce41a6	262	int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
455fbdd3 PM	263	{
	264	mutex_init(&dev->lock);
	265	lis3lv02d_add_fs(dev->device);
	266	lis3lv02d_increase_use(dev);
	267
	268	if (lis3lv02d_joystick_enable())
	269	printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
	270
	271	lis3lv02d_decrease_use(dev);
	272	return 0;
	273	}
cfce41a6	274	EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
455fbdd3 PM	275
	276	/* Sysfs stuff */
	277	static ssize_t lis3lv02d_position_show(struct device *dev,
	278	struct device_attribute attr, char buf)
	279	{
	280	int x, y, z;
	281
	282	lis3lv02d_increase_use(&adev);
	283	lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
	284	lis3lv02d_decrease_use(&adev);
	285	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
	286	}
	287
	288	static ssize_t lis3lv02d_calibrate_show(struct device *dev,
	289	struct device_attribute attr, char buf)
	290	{
	291	return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
	292	}
	293
	294	static ssize_t lis3lv02d_calibrate_store(struct device *dev,
	295	struct device_attribute *attr,
	296	const char *buf, size_t count)
	297	{
	298	lis3lv02d_increase_use(&adev);
	299	lis3lv02d_calibrate_joystick();
	300	lis3lv02d_decrease_use(&adev);
	301	return count;
	302	}
	303
	304	/* conversion btw sampling rate and the register values */
	305	static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
	306	static ssize_t lis3lv02d_rate_show(struct device *dev,
	307	struct device_attribute attr, char buf)
	308	{
	309	u8 ctrl;
	310	int val;
	311
	312	lis3lv02d_increase_use(&adev);
cfce41a6	313	adev.read(adev.device->handle, CTRL_REG1, &ctrl);
455fbdd3 PM	314	lis3lv02d_decrease_use(&adev);
	315	val = (ctrl & (CTRL1_DF0 \| CTRL1_DF1)) >> 4;
	316	return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
	317	}
	318
	319	static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
	320	static DEVICE_ATTR(calibrate, S_IRUGO\|S_IWUSR, lis3lv02d_calibrate_show,
	321	lis3lv02d_calibrate_store);
	322	static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
	323
	324	static struct attribute *lis3lv02d_attributes[] = {
	325	&dev_attr_position.attr,
	326	&dev_attr_calibrate.attr,
	327	&dev_attr_rate.attr,
	328	NULL
	329	};
	330
	331	static struct attribute_group lis3lv02d_attribute_group = {
	332	.attrs = lis3lv02d_attributes
	333	};
	334
cfce41a6	335
455fbdd3 PM	336	static int lis3lv02d_add_fs(struct acpi_device *device)
	337	{
	338	adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	339	if (IS_ERR(adev.pdev))
	340	return PTR_ERR(adev.pdev);
	341
	342	return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
	343	}
	344
cfce41a6	345	int lis3lv02d_remove_fs(void)
455fbdd3 PM	346	{
	347	sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
	348	platform_device_unregister(adev.pdev);
	349	return 0;
	350	}
cfce41a6	351	EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
455fbdd3 PM	352
	353	MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
	354	MODULE_AUTHOR("Yan Burman and Eric Piel");
	355	MODULE_LICENSE("GPL");
	356