drivers/hwmon/lis3lv02d.c - kernel/msm-4.9 - Gitiles

 /*
  *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
  *
  *  Copyright (C) 2007-2008 Yan Burman
  *  Copyright (C) 2008 Eric Piel
  *
  *  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"
 #define ACPI_MDPS_CLASS "accelerometer"

 /* 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 axis_conversion {
 	s8	x;
 	s8	y;
 	s8	z;
 };

 struct acpi_lis3lv02d {
 	struct acpi_device	*device;   /* The ACPI device */
 	struct input_dev	*idev;     /* input device */
 	struct task_struct	*kthread;  /* kthread for input */
 	struct mutex            lock;
 	struct platform_device	*pdev;     /* platform device */
 	atomic_t		count;     /* interrupt count after last read */
 	int			xcalib;    /* calibrated null value for x */
 	int			ycalib;    /* calibrated null value for y */
 	int			zcalib;    /* calibrated null value for z */
 	unsigned char		is_on;     /* whether the device is on or off */
 	unsigned char		usage;     /* usage counter */
 	struct axis_conversion	ac;        /* hw -> logical axis */
 };

 static struct acpi_lis3lv02d adev;

 static int lis3lv02d_remove_fs(void);
 static int lis3lv02d_add_fs(struct acpi_device *device);

 /* For automatic insertion of the module */
 static struct acpi_device_id lis3lv02d_device_ids[] = {
 	{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);

 /**
  * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
  * @handle: the handle of the device
  *
  * Returns AE_OK on success.
  */
 static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
 {
 	return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
 }

 /**
  * lis3lv02d_acpi_read - ACPI ALRD method: read a register
  * @handle: the handle of the device
  * @reg:    the register to read
  * @ret:    result of the operation
  *
  * Returns AE_OK on success.
  */
 static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
 {
 	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 	struct acpi_object_list args = { 1, &arg0 };
 	unsigned long long lret;
 	acpi_status status;

 	arg0.integer.value = reg;

 	status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
 	*ret = lret;
 	return status;
 }

 /**
  * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
  * @handle: the handle of the device
  * @reg:    the register to write to
  * @val:    the value to write
  *
  * Returns AE_OK on success.
  */
 static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
 {
 	unsigned long long ret; /* Not used when writting */
 	union acpi_object in_obj[2];
 	struct acpi_object_list args = { 2, in_obj };

 	in_obj[0].type          = ACPI_TYPE_INTEGER;
 	in_obj[0].integer.value = reg;
 	in_obj[1].type          = ACPI_TYPE_INTEGER;
 	in_obj[1].integer.value = val;

 	return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
 }

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

 	lis3lv02d_acpi_read(handle, reg, &lo);
 	lis3lv02d_acpi_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);
 }

 static inline void lis3lv02d_poweroff(acpi_handle handle)
 {
 	adev.is_on = 0;
 	/* disable X,Y,Z axis and power down */
 	lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
 }

 static void lis3lv02d_poweron(acpi_handle handle)
 {
 	u8 val;

 	adev.is_on = 1;
 	lis3lv02d_acpi_init(handle);
 	lis3lv02d_acpi_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.
 	 */
 	lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
 	val |= CTRL2_BDU | CTRL2_IEN;
 	lis3lv02d_acpi_write(handle, CTRL_REG2, val);
 }

 #ifdef CONFIG_PM
 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 {
 	/* make sure the device is off when we suspend */
 	lis3lv02d_poweroff(device->handle);
 	return 0;
 }

 static int lis3lv02d_resume(struct acpi_device *device)
 {
 	/* put back the device in the right state (ACPI might turn it on) */
 	mutex_lock(&adev.lock);
 	if (adev.usage > 0)
 		lis3lv02d_poweron(device->handle);
 	else
 		lis3lv02d_poweroff(device->handle);
 	mutex_unlock(&adev.lock);
 	return 0;
 }
 #else
 #define lis3lv02d_suspend NULL
 #define lis3lv02d_resume NULL
 #endif


 /*
  * 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);
 }

 static 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;
 }

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

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


 /*
  * Initialise the accelerometer and the various subsystems.
  * Should be rather independant of the bus system.
  */
 static 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;
 }

 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
 {
 	adev.ac = *((struct axis_conversion *)dmi->driver_data);
 	printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);

 	return 1;
 }

 /* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
  * If the value is negative, the opposite of the hw value is used. */
 static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
 static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
 static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
 static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
 static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
 static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};

 #define AXIS_DMI_MATCH(_ident, _name, _axis) {		\
 	.ident = _ident,				\
 	.callback = lis3lv02d_dmi_matched,		\
 	.matches = {					\
 		DMI_MATCH(DMI_PRODUCT_NAME, _name)	\
 	},						\
 	.driver_data = &lis3lv02d_axis_##_axis		\
 }
 static struct dmi_system_id lis3lv02d_dmi_ids[] = {
 	/* product names are truncated to match all kinds of a same model */
 	AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
 	AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
 	AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
 	AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
 	AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
 	AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
 	AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
 	{ NULL, }
 /* Laptop models without axis info (yet):
  * "NC651xx" "HP Compaq 651"
  * "NC671xx" "HP Compaq 671"
  * "NC6910" "HP Compaq 6910"
  * HP Compaq 8710x Notebook PC / Mobile Workstation
  * "NC2400" "HP Compaq nc2400"
  * "NX74x0" "HP Compaq nx74"
  * "NX6325" "HP Compaq nx6325"
  * "NC4400" "HP Compaq nc4400"
  */
 };

 static int lis3lv02d_add(struct acpi_device *device)
 {
 	u8 val;

 	if (!device)
 		return -EINVAL;

 	adev.device = device;
 	strcpy(acpi_device_name(device), DRIVER_NAME);
 	strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 	device->driver_data = &adev;

 	lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
 	if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
 		printk(KERN_ERR DRIVER_NAME
 				": Accelerometer chip not LIS3LV02D{L,Q}\n");
 	}

 	/* If possible use a "standard" axes order */
 	if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
 		printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
 				 "using default axes configuration\n");
 		adev.ac = lis3lv02d_axis_normal;
 	}

 	return lis3lv02d_init_device(&adev);
 }

 static int lis3lv02d_remove(struct acpi_device *device, int type)
 {
 	if (!device)
 		return -EINVAL;

 	lis3lv02d_joystick_disable();
 	lis3lv02d_poweroff(device->handle);

 	return lis3lv02d_remove_fs();
 }


 /* 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);
 	lis3lv02d_acpi_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);
 }

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

 /* For the HP MDPS aka 3D Driveguard */
 static struct acpi_driver lis3lv02d_driver = {
 	.name  = DRIVER_NAME,
 	.class = ACPI_MDPS_CLASS,
 	.ids   = lis3lv02d_device_ids,
 	.ops = {
 		.add     = lis3lv02d_add,
 		.remove  = lis3lv02d_remove,
 		.suspend = lis3lv02d_suspend,
 		.resume  = lis3lv02d_resume,
 	}
 };

 static int __init lis3lv02d_init_module(void)
 {
 	int ret;

 	if (acpi_disabled)
 		return -ENODEV;

 	ret = acpi_bus_register_driver(&lis3lv02d_driver);
 	if (ret < 0)
 		return ret;

 	printk(KERN_INFO DRIVER_NAME " driver loaded.\n");

 	return 0;
 }

 static void __exit lis3lv02d_exit_module(void)
 {
 	acpi_bus_unregister_driver(&lis3lv02d_driver);
 }

 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 MODULE_AUTHOR("Yan Burman and Eric Piel");
 MODULE_LICENSE("GPL");

 module_init(lis3lv02d_init_module);
 module_exit(lis3lv02d_exit_module);
	/*
	* lis3lv02d.c - ST LIS3LV02DL accelerometer driver
	*
	* Copyright (C) 2007-2008 Yan Burman
	* Copyright (C) 2008 Eric Piel
	*
	* 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"
	#define ACPI_MDPS_CLASS "accelerometer"

	/* 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 axis_conversion {
	s8 x;
	s8 y;
	s8 z;
	};

	struct acpi_lis3lv02d {
	struct acpi_device device; / The ACPI device */
	struct input_dev idev; / input device */
	struct task_struct kthread; / kthread for input */
	struct mutex lock;
	struct platform_device pdev; / platform device */
	atomic_t count; /* interrupt count after last read */
	int xcalib; /* calibrated null value for x */
	int ycalib; /* calibrated null value for y */
	int zcalib; /* calibrated null value for z */
	unsigned char is_on; /* whether the device is on or off */
	unsigned char usage; /* usage counter */
	struct axis_conversion ac; /* hw -> logical axis */
	};

	static struct acpi_lis3lv02d adev;

	static int lis3lv02d_remove_fs(void);
	static int lis3lv02d_add_fs(struct acpi_device *device);

	/* For automatic insertion of the module */
	static struct acpi_device_id lis3lv02d_device_ids[] = {
	{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
	{"", 0},
	};
	MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);

	/**
	* lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
	* @handle: the handle of the device
	*
	* Returns AE_OK on success.
	*/
	static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
	{
	return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
	}

	/**
	* lis3lv02d_acpi_read - ACPI ALRD method: read a register
	* @handle: the handle of the device
	* @reg: the register to read
	* @ret: result of the operation
	*
	* Returns AE_OK on success.
	*/
	static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
	{
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
	unsigned long long lret;
	acpi_status status;

	arg0.integer.value = reg;

	status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
	*ret = lret;
	return status;
	}

	/**
	* lis3lv02d_acpi_write - ACPI ALWR method: write to a register
	* @handle: the handle of the device
	* @reg: the register to write to
	* @val: the value to write
	*
	* Returns AE_OK on success.
	*/
	static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
	{
	unsigned long long ret; /* Not used when writting */
	union acpi_object in_obj[2];
	struct acpi_object_list args = { 2, in_obj };

	in_obj[0].type = ACPI_TYPE_INTEGER;
	in_obj[0].integer.value = reg;
	in_obj[1].type = ACPI_TYPE_INTEGER;
	in_obj[1].integer.value = val;

	return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
	}

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

	lis3lv02d_acpi_read(handle, reg, &lo);
	lis3lv02d_acpi_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);
	}

	static inline void lis3lv02d_poweroff(acpi_handle handle)
	{
	adev.is_on = 0;
	/* disable X,Y,Z axis and power down */
	lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
	}

	static void lis3lv02d_poweron(acpi_handle handle)
	{
	u8 val;

	adev.is_on = 1;
	lis3lv02d_acpi_init(handle);
	lis3lv02d_acpi_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.
	*/
	lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
	val \|= CTRL2_BDU \| CTRL2_IEN;
	lis3lv02d_acpi_write(handle, CTRL_REG2, val);
	}

	#ifdef CONFIG_PM
	static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
	{
	/* make sure the device is off when we suspend */
	lis3lv02d_poweroff(device->handle);
	return 0;
	}

	static int lis3lv02d_resume(struct acpi_device *device)
	{
	/* put back the device in the right state (ACPI might turn it on) */
	mutex_lock(&adev.lock);
	if (adev.usage > 0)
	lis3lv02d_poweron(device->handle);
	else
	lis3lv02d_poweroff(device->handle);
	mutex_unlock(&adev.lock);
	return 0;
	}
	#else
	#define lis3lv02d_suspend NULL
	#define lis3lv02d_resume NULL
	#endif


	/*
	* 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);
	}

	static 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;
	}

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

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


	/*
	* Initialise the accelerometer and the various subsystems.
	* Should be rather independant of the bus system.
	*/
	static 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;
	}

	static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
	{
	adev.ac = ((struct axis_conversion )dmi->driver_data);
	printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);

	return 1;
	}

	/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
	* If the value is negative, the opposite of the hw value is used. */
	static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
	static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
	static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
	static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
	static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
	static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};

	#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
	.ident = _ident, \
	.callback = lis3lv02d_dmi_matched, \
	.matches = { \
	DMI_MATCH(DMI_PRODUCT_NAME, _name) \
	}, \
	.driver_data = &lis3lv02d_axis_##_axis \
	}
	static struct dmi_system_id lis3lv02d_dmi_ids[] = {
	/* product names are truncated to match all kinds of a same model */
	AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
	AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
	AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
	AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
	AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
	AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
	AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
	{ NULL, }
	/* Laptop models without axis info (yet):
	* "NC651xx" "HP Compaq 651"
	* "NC671xx" "HP Compaq 671"
	* "NC6910" "HP Compaq 6910"
	* HP Compaq 8710x Notebook PC / Mobile Workstation
	* "NC2400" "HP Compaq nc2400"
	* "NX74x0" "HP Compaq nx74"
	* "NX6325" "HP Compaq nx6325"
	* "NC4400" "HP Compaq nc4400"
	*/
	};

	static int lis3lv02d_add(struct acpi_device *device)
	{
	u8 val;

	if (!device)
	return -EINVAL;

	adev.device = device;
	strcpy(acpi_device_name(device), DRIVER_NAME);
	strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
	device->driver_data = &adev;

	lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
	if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
	printk(KERN_ERR DRIVER_NAME
	": Accelerometer chip not LIS3LV02D{L,Q}\n");
	}

	/* If possible use a "standard" axes order */
	if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
	printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
	"using default axes configuration\n");
	adev.ac = lis3lv02d_axis_normal;
	}

	return lis3lv02d_init_device(&adev);
	}

	static int lis3lv02d_remove(struct acpi_device *device, int type)
	{
	if (!device)
	return -EINVAL;

	lis3lv02d_joystick_disable();
	lis3lv02d_poweroff(device->handle);

	return lis3lv02d_remove_fs();
	}


	/* 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);
	lis3lv02d_acpi_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);
	}

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

	/* For the HP MDPS aka 3D Driveguard */
	static struct acpi_driver lis3lv02d_driver = {
	.name = DRIVER_NAME,
	.class = ACPI_MDPS_CLASS,
	.ids = lis3lv02d_device_ids,
	.ops = {
	.add = lis3lv02d_add,
	.remove = lis3lv02d_remove,
	.suspend = lis3lv02d_suspend,
	.resume = lis3lv02d_resume,
	}
	};

	static int __init lis3lv02d_init_module(void)
	{
	int ret;

	if (acpi_disabled)
	return -ENODEV;

	ret = acpi_bus_register_driver(&lis3lv02d_driver);
	if (ret < 0)
	return ret;

	printk(KERN_INFO DRIVER_NAME " driver loaded.\n");

	return 0;
	}

	static void __exit lis3lv02d_exit_module(void)
	{
	acpi_bus_unregister_driver(&lis3lv02d_driver);
	}

	MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
	MODULE_AUTHOR("Yan Burman and Eric Piel");
	MODULE_LICENSE("GPL");

	module_init(lis3lv02d_init_module);
	module_exit(lis3lv02d_exit_module);