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
  25 static 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
  47 static 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
  64 static const struct hid_device_id ez_devices[] = {
  65         { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  66         { }
  67 };
  68 MODULE_DEVICE_TABLE(hid, ez_devices);
  69
  70 static struct hid_driver ez_driver = {
  71         .name = "ezkey",
  72         .id_table = ez_devices,
  73         .input_mapping = ez_input_mapping,
  74         .event = ez_event,
  75 };
  76 module_hid_driver(ez_driver);
  77
  78 MODULE_DESCRIPTION("HID driver for some ezkey \"special\" devices");
  79 MODULE_LICENSE("GPL");