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ams-input.c

/*
 * 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 void ams_idev_poll(struct input_polled_dev *dev)
{
      struct input_dev *idev = dev->input;
      s8 x, y, z;

      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(idev, ABS_X, invert ? -x : x);
      input_report_abs(idev, ABS_Y, invert ? -y : y);
      input_report_abs(idev, ABS_Z, z);

      input_sync(idev);

      mutex_unlock(&ams_info.lock);
}

/* Call with ams_info.lock held! */
static void ams_input_enable(void)
{
      struct input_dev *input;
      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_polled_device();
      if (!ams_info.idev)
            return;

      ams_info.idev->poll = ams_idev_poll;
      ams_info.idev->poll_interval = 25;

      input = ams_info.idev->input;
      input->name = "Apple Motion Sensor";
      input->id.bustype = ams_info.bustype;
      input->id.vendor = 0;
      input->dev.parent = &ams_info.of_dev->dev;

      input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
      input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
      input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);

      set_bit(EV_ABS, input->evbit);
      set_bit(EV_KEY, input->evbit);
      set_bit(BTN_TOUCH, input->keybit);

      if (input_register_polled_device(ams_info.idev)) {
            input_free_polled_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_polled_device(ams_info.idev);
            input_free_polled_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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