357 строки
9.5 KiB
C
357 строки
9.5 KiB
C
/*
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* lis3lv02d.c - ST LIS3LV02DL accelerometer driver
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*
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* Copyright (C) 2007-2008 Yan Burman
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* Copyright (C) 2008 Eric Piel
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* Copyright (C) 2008 Pavel Machek
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/kthread.h>
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#include <linux/semaphore.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/freezer.h>
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#include <linux/uaccess.h>
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#include <acpi/acpi_drivers.h>
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#include <asm/atomic.h>
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#include "lis3lv02d.h"
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#define DRIVER_NAME "lis3lv02d"
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/* joystick device poll interval in milliseconds */
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#define MDPS_POLL_INTERVAL 50
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/*
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* The sensor can also generate interrupts (DRDY) but it's pretty pointless
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* because their are generated even if the data do not change. So it's better
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* to keep the interrupt for the free-fall event. The values are updated at
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* 40Hz (at the lowest frequency), but as it can be pretty time consuming on
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* some low processor, we poll the sensor only at 20Hz... enough for the
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* joystick.
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*/
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/* Maximum value our axis may get for the input device (signed 12 bits) */
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#define MDPS_MAX_VAL 2048
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struct acpi_lis3lv02d adev;
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EXPORT_SYMBOL_GPL(adev);
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static int lis3lv02d_add_fs(struct acpi_device *device);
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static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
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{
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u8 lo, hi;
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adev.read(handle, reg, &lo);
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adev.read(handle, reg + 1, &hi);
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/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
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return (s16)((hi << 8) | lo);
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}
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/**
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* lis3lv02d_get_axis - For the given axis, give the value converted
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* @axis: 1,2,3 - can also be negative
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* @hw_values: raw values returned by the hardware
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*
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* Returns the converted value.
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*/
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static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
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{
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if (axis > 0)
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return hw_values[axis - 1];
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else
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return -hw_values[-axis - 1];
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}
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/**
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* lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
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* @handle: the handle to the device
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* @x: where to store the X axis value
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* @y: where to store the Y axis value
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* @z: where to store the Z axis value
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*
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* Note that 40Hz input device can eat up about 10% CPU at 800MHZ
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*/
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static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
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{
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int position[3];
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position[0] = lis3lv02d_read_16(handle, OUTX_L);
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position[1] = lis3lv02d_read_16(handle, OUTY_L);
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position[2] = lis3lv02d_read_16(handle, OUTZ_L);
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*x = lis3lv02d_get_axis(adev.ac.x, position);
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*y = lis3lv02d_get_axis(adev.ac.y, position);
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*z = lis3lv02d_get_axis(adev.ac.z, position);
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}
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void lis3lv02d_poweroff(acpi_handle handle)
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{
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adev.is_on = 0;
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/* disable X,Y,Z axis and power down */
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adev.write(handle, CTRL_REG1, 0x00);
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
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void lis3lv02d_poweron(acpi_handle handle)
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{
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u8 val;
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adev.is_on = 1;
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adev.init(handle);
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adev.write(handle, FF_WU_CFG, 0);
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/*
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* BDU: LSB and MSB values are not updated until both have been read.
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* So the value read will always be correct.
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* IEN: Interrupt for free-fall and DD, not for data-ready.
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*/
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adev.read(handle, CTRL_REG2, &val);
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val |= CTRL2_BDU | CTRL2_IEN;
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adev.write(handle, CTRL_REG2, val);
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
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/*
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* To be called before starting to use the device. It makes sure that the
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* device will always be on until a call to lis3lv02d_decrease_use(). Not to be
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* used from interrupt context.
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*/
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static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
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{
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mutex_lock(&dev->lock);
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dev->usage++;
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if (dev->usage == 1) {
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if (!dev->is_on)
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lis3lv02d_poweron(dev->device->handle);
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}
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mutex_unlock(&dev->lock);
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}
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/*
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* To be called whenever a usage of the device is stopped.
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* It will make sure to turn off the device when there is not usage.
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*/
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static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
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{
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mutex_lock(&dev->lock);
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dev->usage--;
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if (dev->usage == 0)
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lis3lv02d_poweroff(dev->device->handle);
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mutex_unlock(&dev->lock);
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}
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/**
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* lis3lv02d_joystick_kthread - Kthread polling function
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* @data: unused - here to conform to threadfn prototype
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*/
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static int lis3lv02d_joystick_kthread(void *data)
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{
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int x, y, z;
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while (!kthread_should_stop()) {
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lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
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input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
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input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
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input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);
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input_sync(adev.idev);
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try_to_freeze();
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msleep_interruptible(MDPS_POLL_INTERVAL);
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}
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return 0;
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}
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static int lis3lv02d_joystick_open(struct input_dev *input)
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{
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lis3lv02d_increase_use(&adev);
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adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
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if (IS_ERR(adev.kthread)) {
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lis3lv02d_decrease_use(&adev);
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return PTR_ERR(adev.kthread);
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}
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return 0;
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}
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static void lis3lv02d_joystick_close(struct input_dev *input)
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{
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kthread_stop(adev.kthread);
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lis3lv02d_decrease_use(&adev);
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}
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static inline void lis3lv02d_calibrate_joystick(void)
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{
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lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
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}
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int lis3lv02d_joystick_enable(void)
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{
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int err;
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if (adev.idev)
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return -EINVAL;
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adev.idev = input_allocate_device();
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if (!adev.idev)
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return -ENOMEM;
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lis3lv02d_calibrate_joystick();
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adev.idev->name = "ST LIS3LV02DL Accelerometer";
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adev.idev->phys = DRIVER_NAME "/input0";
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adev.idev->id.bustype = BUS_HOST;
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adev.idev->id.vendor = 0;
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adev.idev->dev.parent = &adev.pdev->dev;
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adev.idev->open = lis3lv02d_joystick_open;
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adev.idev->close = lis3lv02d_joystick_close;
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set_bit(EV_ABS, adev.idev->evbit);
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input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
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input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
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input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
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err = input_register_device(adev.idev);
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if (err) {
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input_free_device(adev.idev);
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adev.idev = NULL;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
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void lis3lv02d_joystick_disable(void)
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{
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if (!adev.idev)
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return;
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input_unregister_device(adev.idev);
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adev.idev = NULL;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
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/*
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* Initialise the accelerometer and the various subsystems.
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* Should be rather independant of the bus system.
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*/
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int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
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{
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mutex_init(&dev->lock);
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lis3lv02d_add_fs(dev->device);
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lis3lv02d_increase_use(dev);
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if (lis3lv02d_joystick_enable())
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printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
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lis3lv02d_decrease_use(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
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/* Sysfs stuff */
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static ssize_t lis3lv02d_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int x, y, z;
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lis3lv02d_increase_use(&adev);
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lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
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lis3lv02d_decrease_use(&adev);
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return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
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}
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static ssize_t lis3lv02d_calibrate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
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}
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static ssize_t lis3lv02d_calibrate_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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lis3lv02d_increase_use(&adev);
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lis3lv02d_calibrate_joystick();
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lis3lv02d_decrease_use(&adev);
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return count;
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}
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/* conversion btw sampling rate and the register values */
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static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
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static ssize_t lis3lv02d_rate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u8 ctrl;
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int val;
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lis3lv02d_increase_use(&adev);
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adev.read(adev.device->handle, CTRL_REG1, &ctrl);
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lis3lv02d_decrease_use(&adev);
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val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
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return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
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}
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static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
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static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
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lis3lv02d_calibrate_store);
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static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
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static struct attribute *lis3lv02d_attributes[] = {
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&dev_attr_position.attr,
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&dev_attr_calibrate.attr,
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&dev_attr_rate.attr,
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NULL
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};
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static struct attribute_group lis3lv02d_attribute_group = {
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.attrs = lis3lv02d_attributes
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};
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static int lis3lv02d_add_fs(struct acpi_device *device)
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{
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adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
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if (IS_ERR(adev.pdev))
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return PTR_ERR(adev.pdev);
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return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
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}
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int lis3lv02d_remove_fs(void)
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{
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sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
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platform_device_unregister(adev.pdev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
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MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
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MODULE_AUTHOR("Yan Burman and Eric Piel");
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MODULE_LICENSE("GPL");
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