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582 lines
16 KiB
C
582 lines
16 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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*
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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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#define ACPI_MDPS_CLASS "accelerometer"
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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 axis_conversion {
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s8 x;
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s8 y;
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s8 z;
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};
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struct acpi_lis3lv02d {
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struct acpi_device *device; /* The ACPI device */
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struct input_dev *idev; /* input device */
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struct task_struct *kthread; /* kthread for input */
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struct mutex lock;
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struct platform_device *pdev; /* platform device */
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atomic_t count; /* interrupt count after last read */
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int xcalib; /* calibrated null value for x */
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int ycalib; /* calibrated null value for y */
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int zcalib; /* calibrated null value for z */
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unsigned char is_on; /* whether the device is on or off */
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unsigned char usage; /* usage counter */
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struct axis_conversion ac; /* hw -> logical axis */
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};
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static struct acpi_lis3lv02d adev;
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static int lis3lv02d_remove_fs(void);
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static int lis3lv02d_add_fs(struct acpi_device *device);
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/* For automatic insertion of the module */
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static struct acpi_device_id lis3lv02d_device_ids[] = {
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{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
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/**
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* lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
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* @handle: the handle of the device
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*
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* Returns AE_OK on success.
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*/
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static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
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{
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return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
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}
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/**
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* lis3lv02d_acpi_read - ACPI ALRD method: read a register
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* @handle: the handle of the device
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* @reg: the register to read
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* @ret: result of the operation
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*
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* Returns AE_OK on success.
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*/
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static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
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{
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list args = { 1, &arg0 };
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unsigned long long lret;
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acpi_status status;
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arg0.integer.value = reg;
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status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
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*ret = lret;
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return status;
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}
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/**
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* lis3lv02d_acpi_write - ACPI ALWR method: write to a register
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* @handle: the handle of the device
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* @reg: the register to write to
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* @val: the value to write
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*
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* Returns AE_OK on success.
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*/
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static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
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{
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unsigned long long ret; /* Not used when writting */
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union acpi_object in_obj[2];
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struct acpi_object_list args = { 2, in_obj };
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in_obj[0].type = ACPI_TYPE_INTEGER;
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in_obj[0].integer.value = reg;
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in_obj[1].type = ACPI_TYPE_INTEGER;
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in_obj[1].integer.value = val;
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return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
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}
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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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lis3lv02d_acpi_read(handle, reg, &lo);
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lis3lv02d_acpi_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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static inline 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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lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
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}
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static 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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lis3lv02d_acpi_init(handle);
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lis3lv02d_acpi_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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lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
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val |= CTRL2_BDU | CTRL2_IEN;
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lis3lv02d_acpi_write(handle, CTRL_REG2, val);
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}
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#ifdef CONFIG_PM
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static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
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{
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/* make sure the device is off when we suspend */
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lis3lv02d_poweroff(device->handle);
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return 0;
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}
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static int lis3lv02d_resume(struct acpi_device *device)
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{
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/* put back the device in the right state (ACPI might turn it on) */
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mutex_lock(&adev.lock);
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if (adev.usage > 0)
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lis3lv02d_poweron(device->handle);
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else
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lis3lv02d_poweroff(device->handle);
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mutex_unlock(&adev.lock);
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return 0;
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}
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#else
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#define lis3lv02d_suspend NULL
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#define lis3lv02d_resume NULL
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#endif
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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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static 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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static 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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/*
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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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static 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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static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
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{
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adev.ac = *((struct axis_conversion *)dmi->driver_data);
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printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
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return 1;
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}
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/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
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* If the value is negative, the opposite of the hw value is used. */
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static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
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static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
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static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
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static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
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static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
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static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
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#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
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.ident = _ident, \
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.callback = lis3lv02d_dmi_matched, \
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.matches = { \
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DMI_MATCH(DMI_PRODUCT_NAME, _name) \
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}, \
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.driver_data = &lis3lv02d_axis_##_axis \
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}
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static struct dmi_system_id lis3lv02d_dmi_ids[] = {
|
||
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/* 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);
|