// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for some ezkey "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2008 Jiri Slaby
 */

/*
 */

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

#include "hid-ids.h"

#define ez_map_rel(c)   hid_map_usage(hi, usage, bit, max, EV_REL, (c))
#define ez_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))

static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
                struct hid_field *field, struct hid_usage *usage,
                unsigned long **bit, int *max)
{
        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
                return 0;

        switch (usage->hid & HID_USAGE) {
        case 0x230: ez_map_key(BTN_MOUSE);      break;
        case 0x231: ez_map_rel(REL_WHEEL);      break;
        /*
         * this keyboard has a scrollwheel implemented in
         * totally broken way. We map this usage temporarily
         * to HWHEEL and handle it in the event quirk handler
         */
        case 0x232: ez_map_rel(REL_HWHEEL);     break;
        default:
                return 0;
        }
        return 1;
}

static int ez_event(struct hid_device *hdev, struct hid_field *field,
                struct hid_usage *usage, __s32 value)
{
        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
                        !usage->type)
                return 0;

        /* handle the temporary quirky mapping to HWHEEL */
        if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
                struct input_dev *input = field->hidinput->input;
                input_event(input, usage->type, REL_WHEEL, -value);
                return 1;
        }

        return 0;
}

static const struct hid_device_id ez_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
        { }
};
MODULE_DEVICE_TABLE(hid, ez_devices);

static struct hid_driver ez_driver = {
        .name = "ezkey",
        .id_table = ez_devices,
        .input_mapping = ez_input_mapping,
        .event = ez_event,
};
module_hid_driver(ez_driver);

MODULE_DESCRIPTION("HID driver for some ezkey \"special\" devices");
MODULE_LICENSE("GPL");