![Eric Piel](/assets/img/avatar_default.png)
The sensor can be accessed via various buses. In particular, SPI, I²C and, on HP laptops, via a specific ACPI API (the only one currently supported). Separate this latest platform from the core of the sensor driver to allow support for the other bus type. The second, and more direct goal is actually to be able to merge this part with the hp-disk-leds driver, which has the same ACPI PNP number. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
357 lines
9.5 KiB
C
357 lines
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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