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/*
* Apple Motion Sensor driver (joystick emulation)
*
* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
*
* 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.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include "ams.h"
static unsigned int joystick;
module_param(joystick, bool, 0644);
MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
static unsigned int invert;
module_param(invert, bool, 0644);
MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
static int ams_input_kthread(void *data)
{
s8 x, y, z;
while (!kthread_should_stop()) {
mutex_lock(&ams_info.lock);
ams_sensors(&x, &y, &z);
x -= ams_info.xcalib;
y -= ams_info.ycalib;
z -= ams_info.zcalib;
input_report_abs(ams_info.idev, ABS_X, invert ? -x : x);
input_report_abs(ams_info.idev, ABS_Y, invert ? -y : y);
input_report_abs(ams_info.idev, ABS_Z, z);
input_sync(ams_info.idev);
mutex_unlock(&ams_info.lock);
msleep(25);
}
return 0;
}
static int ams_input_open(struct input_dev *dev)
{
ams_info.kthread = kthread_run(ams_input_kthread, NULL, "kams");
return IS_ERR(ams_info.kthread) ? PTR_ERR(ams_info.kthread) : 0;
}
static void ams_input_close(struct input_dev *dev)
{
kthread_stop(ams_info.kthread);
}
/* Call with ams_info.lock held! */
static void ams_input_enable(void)
{
s8 x, y, z;
if (ams_info.idev)
return;
ams_sensors(&x, &y, &z);
ams_info.xcalib = x;
ams_info.ycalib = y;
ams_info.zcalib = z;
ams_info.idev = input_allocate_device();
if (!ams_info.idev)
return;
ams_info.idev->name = "Apple Motion Sensor";
ams_info.idev->id.bustype = ams_info.bustype;
ams_info.idev->id.vendor = 0;
ams_info.idev->open = ams_input_open;
ams_info.idev->close = ams_input_close;
ams_info.idev->dev.parent = &ams_info.of_dev->dev;
input_set_abs_params(ams_info.idev, ABS_X, -50, 50, 3, 0);
input_set_abs_params(ams_info.idev, ABS_Y, -50, 50, 3, 0);
input_set_abs_params(ams_info.idev, ABS_Z, -50, 50, 3, 0);
set_bit(EV_ABS, ams_info.idev->evbit);
set_bit(EV_KEY, ams_info.idev->evbit);
set_bit(BTN_TOUCH, ams_info.idev->keybit);
if (input_register_device(ams_info.idev)) {
input_free_device(ams_info.idev);
ams_info.idev = NULL;
return;
}
}
/* Call with ams_info.lock held! */
static void ams_input_disable(void)
{
if (ams_info.idev) {
input_unregister_device(ams_info.idev);
ams_info.idev = NULL;
}
}
static ssize_t ams_input_show_joystick(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", joystick);
}
static ssize_t ams_input_store_joystick(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
if (sscanf(buf, "%d\n", &joystick) != 1)
return -EINVAL;
mutex_lock(&ams_info.lock);
if (joystick)
ams_input_enable();
else
ams_input_disable();
mutex_unlock(&ams_info.lock);
return count;
}
static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
ams_input_show_joystick, ams_input_store_joystick);
/* Call with ams_info.lock held! */
int ams_input_init(void)
{
int result;
result = device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
if (!result && joystick)
ams_input_enable();
return result;
}
/* Call with ams_info.lock held! */
void ams_input_exit(void)
{
ams_input_disable();
device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
}
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