LXR linux/drivers/hid/hid-ezkey.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  HID driver for some ezkey "special" devices
   4 *
   5 *  Copyright (c) 1999 Andreas Gal
   6 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8 *  Copyright (c) 2006-2007 Jiri Kosina
   9 *  Copyright (c) 2008 Jiri Slaby
  10 */
  11
  12/*
  13 */
  14
  15#include <linux/device.h>
  16#include <linux/input.h>
  17#include <linux/hid.h>
  18#include <linux/module.h>
  19
  20#include "hid-ids.h"
  21
  22#define ez_map_rel(c)   hid_map_usage(hi, usage, bit, max, EV_REL, (c))
  23#define ez_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
  24
  25static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  26                struct hid_field *field, struct hid_usage *usage,
  27                unsigned long **bit, int *max)
  28{
  29        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  30                return 0;
  31
  32        switch (usage->hid & HID_USAGE) {
  33        case 0x230: ez_map_key(BTN_MOUSE);      break;
  34        case 0x231: ez_map_rel(REL_WHEEL);      break;
  35        /*
  36         * this keyboard has a scrollwheel implemented in
  37         * totally broken way. We map this usage temporarily
  38         * to HWHEEL and handle it in the event quirk handler
  39         */
  40        case 0x232: ez_map_rel(REL_HWHEEL);     break;
  41        default:
  42                return 0;
  43        }
  44        return 1;
  45}
  46
  47static int ez_event(struct hid_device *hdev, struct hid_field *field,
  48                struct hid_usage *usage, __s32 value)
  49{
  50        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  51                        !usage->type)
  52                return 0;
  53
  54        /* handle the temporary quirky mapping to HWHEEL */
  55        if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
  56                struct input_dev *input = field->hidinput->input;
  57                input_event(input, usage->type, REL_WHEEL, -value);
  58                return 1;
  59        }
  60
  61        return 0;
  62}
  63
  64static const struct hid_device_id ez_devices[] = {
  65        { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  66        { }
  67};
  68MODULE_DEVICE_TABLE(hid, ez_devices);
  69
  70static struct hid_driver ez_driver = {
  71        .name = "ezkey",
  72        .id_table = ez_devices,
  73        .input_mapping = ez_input_mapping,
  74        .event = ez_event,
  75};
  76module_hid_driver(ez_driver);
  77
  78MODULE_LICENSE("GPL");
  79