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