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/*
 *  Input driver event debug module - dumps all events into syslog
 */


/*
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */


#include <linuxcomp.h>

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/device.h>

//#define DEBUG_JOY

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input driver joystick module");
MODULE_LICENSE("GPL");

static char joystick_name[] = "joystick";
static struct input_handler joystick_handler;

static void joystick_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
#ifdef DEBUG_JOY
        printk(KERN_DEBUG "joystick.c: Event. Dev: %s, Type: %d, Code: %d, Value: %d\n", handle->dev->phys, type, code, value);
#endif
}

static struct input_handle *joystick_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
{
        struct input_handle *handle;

        /* Avoid tablets */
        if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
                return NULL;

        if (!(handle = kmalloc(sizeof(struct input_handle), GFP_KERNEL)))
                return NULL;
        memset(handle, 0, sizeof(struct input_handle));

        handle->dev = dev;
        handle->handler = handler;
        handle->name = joystick_name;

        input_open_device(handle);

#ifdef DEBUG_JOY
        printk(KERN_DEBUG "joystick.c: Connected device: \"%s\", %s\n", dev->name, dev->phys);
#endif

        return handle;
}

static void joystick_disconnect(struct input_handle *handle)
{
#ifdef DEBUG_JOY
        printk(KERN_DEBUG "joystick.c: Disconnected device: %s\n", handle->dev->phys);
#endif 
        input_close_device(handle);

        kfree(handle);
}

/*static struct input_device_id joystick_ids[] = {
        { .driver_info = 1 },   // Matches all devices
        { },                    // Terminating zero entry
};*/


static struct input_device_id joystick_ids[] = {
        {
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
                .evbit = { BIT(EV_ABS) },
                .absbit = { BIT(ABS_X) },
        },
        {
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
                .evbit = { BIT(EV_ABS) },
                .absbit = { BIT(ABS_WHEEL) },
        },
        {
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
                .evbit = { BIT(EV_ABS) },
                .absbit = { BIT(ABS_THROTTLE) },
        },
        { },    /* Terminating entry */
};

MODULE_DEVICE_TABLE(input, joystick_ids);
       
static struct input_handler joystick_handler = {
        .event =        joystick_event,
        .connect =      joystick_connect,
        .disconnect =   joystick_disconnect,
        .name =         "joystick",
        .id_table =     joystick_ids,
};

int __init joystick_init(void)
{
        input_register_handler(&joystick_handler);
        return 0;
}

void __exit joystick_exit(void)
{
        input_unregister_handler(&joystick_handler);
}

module_init(joystick_init);
module_exit(joystick_exit);