drivers/hid/hid-ezkey.c

   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
  29 static 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
  51 static 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
  68 static const struct hid_device_id ez_devices[] = {
  69         { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  70         { }
  71 };
  72 MODULE_DEVICE_TABLE(hid, ez_devices);
  73
  74 static 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
  81 static int __init ez_init(void)
  82 {
  83         return hid_register_driver(&ez_driver);
  84 }
  85
  86 static void __exit ez_exit(void)
  87 {
  88         hid_unregister_driver(&ez_driver);
  89 }
  90
  91 module_init(ez_init);
  92 module_exit(ez_exit);
  93 MODULE_LICENSE("GPL");