linux/drivers/hid/hid-ezkey.c
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   1/*
   2 *  HID driver for some ezkey "special" devices
   3 *
   4 *  Copyright (c) 1999 Andreas Gal
   5 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7 *  Copyright (c) 2006-2007 Jiri Kosina
   8 *  Copyright (c) 2007 Paul Walmsley
   9 *  Copyright (c) 2008 Jiri Slaby
  10 */
  11
  12/*
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of the GNU General Public License as published by the Free
  15 * Software Foundation; either version 2 of the License, or (at your option)
  16 * any later version.
  17 */
  18
  19#include <linux/device.h>
  20#include <linux/input.h>
  21#include <linux/hid.h>
  22#include <linux/module.h>
  23
  24#include "hid-ids.h"
  25
  26#define ez_map_rel(c)   hid_map_usage(hi, usage, bit, max, EV_REL, (c))
  27#define ez_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
  28
  29static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  30                struct hid_field *field, struct hid_usage *usage,
  31                unsigned long **bit, int *max)
  32{
  33        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  34                return 0;
  35
  36        switch (usage->hid & HID_USAGE) {
  37        case 0x230: ez_map_key(BTN_MOUSE);      break;
  38        case 0x231: ez_map_rel(REL_WHEEL);      break;
  39        /*
  40         * this keyboard has a scrollwheel implemented in
  41         * totally broken way. We map this usage temporarily
  42         * to HWHEEL and handle it in the event quirk handler
  43         */
  44        case 0x232: ez_map_rel(REL_HWHEEL);     break;
  45        default:
  46                return 0;
  47        }
  48        return 1;
  49}
  50
  51static int ez_event(struct hid_device *hdev, struct hid_field *field,
  52                struct hid_usage *usage, __s32 value)
  53{
  54        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  55                        !usage->type)
  56                return 0;
  57
  58        /* handle the temporary quirky mapping to HWHEEL */
  59        if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
  60                struct input_dev *input = field->hidinput->input;
  61                input_event(input, usage->type, REL_WHEEL, -value);
  62                return 1;
  63        }
  64
  65        return 0;
  66}
  67
  68static const struct hid_device_id ez_devices[] = {
  69        { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  70        { }
  71};
  72MODULE_DEVICE_TABLE(hid, ez_devices);
  73
  74static struct hid_driver ez_driver = {
  75        .name = "ezkey",
  76        .id_table = ez_devices,
  77        .input_mapping = ez_input_mapping,
  78        .event = ez_event,
  79};
  80
  81static int __init ez_init(void)
  82{
  83        return hid_register_driver(&ez_driver);
  84}
  85
  86static void __exit ez_exit(void)
  87{
  88        hid_unregister_driver(&ez_driver);
  89}
  90
  91module_init(ez_init);
  92module_exit(ez_exit);
  93MODULE_LICENSE("GPL");
  94
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