/*
 *  HID driver for TouchPack touchscreen
 *  (ASUS eee top touch screen)
 *
 *  Copyright (c) 2009 Gabriele Turchi - gabriele.turchi@l39a.com
 */

/*
 * 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/device.h>
#include <linux/hid.h>
#include <linux/module.h>

#include "hid-ids.h"

static int tp_input_mapping(struct hid_device *device, struct hid_input *hi,
		struct hid_field *field, struct hid_usage *usage,
		unsigned long **bit, int *max)
{
	/* This is needed for evdev compatibility: these events are (apparently) never generated, but
         * X11 evdev driver goes mad with it.
         */

	if ( (usage->hid & HID_USAGE_PAGE) == HID_UP_DIGITIZER) {
		printk(KERN_INFO "tp_input_mapping: discard HID_UP_DIGITIZER => 0x%04X\n", usage->hid);
		return -1;
	}

	return 0;
}

static int tp_event(struct hid_device *device, struct hid_field *field, struct hid_usage *usage, __s32 value)
{
	/* "Somewere" the right axis number is changed with the wrong one.
         * Here we restore the correct values.
         */

	if ( (usage->code == 0x02) || (usage->code == 0x03) )
		usage->code -= 2;
	return 0;
}


static const struct hid_device_id tp_devices[] = {
	{ HID_USB_DEVICE( 0x1bfd, 0x1688) },
	{ }
};
MODULE_DEVICE_TABLE(hid, tp_devices);

static struct hid_driver tp_driver = {
	.name = "touchpack",
	.id_table = tp_devices,
	.input_mapping = tp_input_mapping,
	.event = tp_event,
};

static int tp_init(void)
{
	return hid_register_driver(&tp_driver);
}

static void tp_exit(void)
{
	hid_unregister_driver(&tp_driver);
}

module_init(tp_init);
module_exit(tp_exit);
MODULE_LICENSE("GPL");

HID_COMPAT_LOAD_DRIVER(touchpack);