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Linux/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");
 82 

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