diff options
Diffstat (limited to 'drivers/hwmon/lis3lv02d.c')
| -rw-r--r-- | drivers/hwmon/lis3lv02d.c | 356 |
1 files changed, 0 insertions, 356 deletions
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c deleted file mode 100644 index 219d2d0d5a6..00000000000 --- a/drivers/hwmon/lis3lv02d.c +++ /dev/null @@ -1,356 +0,0 @@ -/* - * 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"); - |