drivers/hid/hid-ntrig.c

   1 /*
   2  *  HID driver for some ntrig "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  *  Copyright (c) 2008 Rafi Rubin
  11  *
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the Free
  17  * Software Foundation; either version 2 of the License, or (at your option)
  18  * any later version.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/hid.h>
  23 #include <linux/module.h>
  24
  25 #include "hid-ids.h"
  26
  27 #define NTRIG_DUPLICATE_USAGES  0x001
  28
  29 #define nt_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
  30                                         EV_KEY, (c))
  31
  32 static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  33                 struct hid_field *field, struct hid_usage *usage,
  34                 unsigned long **bit, int *max)
  35 {
  36         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_DIGITIZER &&
  37                         (usage->hid & 0xff) == 0x47) {
  38                 nt_map_key_clear(BTN_TOOL_DOUBLETAP);
  39                 return 1;
  40         }
  41         return 0;
  42 }
  43
  44 static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  45                 struct hid_field *field, struct hid_usage *usage,
  46                 unsigned long **bit, int *max)
  47 {
  48         if (usage->type == EV_KEY || usage->type == EV_REL
  49                         || usage->type == EV_ABS)
  50                 clear_bit(usage->code, *bit);
  51
  52         return 0;
  53 }
  54 static const struct hid_device_id ntrig_devices[] = {
  55         { HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
  56                 .driver_data = NTRIG_DUPLICATE_USAGES },
  57         { }
  58 };
  59 MODULE_DEVICE_TABLE(hid, ntrig_devices);
  60
  61 static struct hid_driver ntrig_driver = {
  62         .name = "ntrig",
  63         .id_table = ntrig_devices,
  64         .input_mapping = ntrig_input_mapping,
  65         .input_mapped = ntrig_input_mapped,
  66 };
  67
  68 static int ntrig_init(void)
  69 {
  70         return hid_register_driver(&ntrig_driver);
  71 }
  72
  73 static void ntrig_exit(void)
  74 {
  75         hid_unregister_driver(&ntrig_driver);
  76 }
  77
  78 module_init(ntrig_init);
  79 module_exit(ntrig_exit);
  80 MODULE_LICENSE("GPL");
  81
  82 HID_COMPAT_LOAD_DRIVER(ntrig);