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) 2008 Jiri Slaby
   9 */
  10
  11/*
  12 * This program is free software; you can redistribute it and/or modify it
  13 * under the terms of the GNU General Public License as published by the Free
  14 * Software Foundation; either version 2 of the License, or (at your option)
  15 * any later version.
  16 */
  17
  18#include <linux/device.h>
  19#include <linux/input.h>
  20#include <linux/hid.h>
  21#include <linux/module.h>
  22
  23#include "hid-ids.h"
  24
  25#define ez_map_rel(c)   hid_map_usage(hi, usage, bit, max, EV_REL, (c))
  26#define ez_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
  27
  28static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  29                struct hid_field *field, struct hid_usage *usage,
  30                unsigned long **bit, int *max)
  31{
  32        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  33                return 0;
  34
  35        switch (usage->hid & HID_USAGE) {
  36        case 0x230: ez_map_key(BTN_MOUSE);      break;
  37        case 0x231: ez_map_rel(REL_WHEEL);      break;
  38        /*
  39         * this keyboard has a scrollwheel implemented in
  40         * totally broken way. We map this usage temporarily
  41         * to HWHEEL and handle it in the event quirk handler
  42         */
  43        case 0x232: ez_map_rel(REL_HWHEEL);     break;
  44        default:
  45                return 0;
  46        }
  47        return 1;
  48}
  49
  50static int ez_event(struct hid_device *hdev, struct hid_field *field,
  51                struct hid_usage *usage, __s32 value)
  52{
  53        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  54                        !usage->type)
  55                return 0;
  56
  57        /* handle the temporary quirky mapping to HWHEEL */
  58        if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
  59                struct input_dev *input = field->hidinput->input;
  60                input_event(input, usage->type, REL_WHEEL, -value);
  61                return 1;
  62        }
  63
  64        return 0;
  65}
  66
  67static const struct hid_device_id ez_devices[] = {
  68        { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  69        { }
  70};
  71MODULE_DEVICE_TABLE(hid, ez_devices);
  72
  73static struct hid_driver ez_driver = {
  74        .name = "ezkey",
  75        .id_table = ez_devices,
  76        .input_mapping = ez_input_mapping,
  77        .event = ez_event,
  78};
  79module_hid_driver(ez_driver);
  80
  81MODULE_LICENSE("GPL");
  82
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