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) 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
  28 static 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
  50 static 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
  67 static const struct hid_device_id ez_devices[] = {
  68         { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
  69         { }
  70 };
  71 MODULE_DEVICE_TABLE(hid, ez_devices);
  72
  73 static struct hid_driver ez_driver = {
  74         .name = "ezkey",
  75         .id_table = ez_devices,
  76         .input_mapping = ez_input_mapping,
  77         .event = ez_event,
  78 };
  79 module_hid_driver(ez_driver);
  80
  81 MODULE_LICENSE("GPL");