/usr/include/brltty/brldefs-hd.h is in libbrlapi-dev 5.5-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /*
 * BRLTTY - A background process providing access to the console screen (when in
 *          text mode) for a blind person using a refreshable braille display.
 *
 * Copyright (C) 1995-2017 by The BRLTTY Developers.
 *
 * BRLTTY comes with ABSOLUTELY NO WARRANTY.
 *
 * This is free software, placed under the terms of the
 * GNU Lesser General Public License, as published by the Free Software
 * Foundation; either version 2.1 of the License, or (at your option) any
 * later version. Please see the file LICENSE-LGPL for details.
 *
 * Web Page: http://brltty.com/
 *
 * This software is maintained by Dave Mielke <dave@mielke.cc>.
 */
#ifndef BRLTTY_INCLUDED_HD_BRLDEFS
#define BRLTTY_INCLUDED_HD_BRLDEFS
typedef enum {
  HD_REQ_WRITE_CELLS = 0X01
} HD_RequestCode;
typedef enum {
  HD_PFL_K1 = 0X04,
  HD_PFL_K2 = 0X03,
  HD_PFL_K3 = 0X08,
  HD_PFL_B1 = 0X03,
  HD_PFL_B2 = 0X07,
  HD_PFL_B3 = 0X0B,
  HD_PFL_B4 = 0X0F,
  HD_PFL_B5 = 0X13,
  HD_PFL_B6 = 0X17,
  HD_PFL_B7 = 0X1B,
  HD_PFL_B8 = 0X1F
} HD_KeyCode_ProfiLine;
typedef enum {
  HD_MBL_B1 =  0,
  HD_MBL_B2 =  1,
  HD_MBL_B3 =  2,
  HD_MBL_B4 =  4,
  HD_MBL_B5 =  5,
  HD_MBL_B6 =  6,
  HD_MBL_K1 =  8,
  HD_MBL_K2 =  9,
  HD_MBL_K3 = 10
} HD_KeyCode_MobilLine;
typedef enum {
  HD_GRP_NavigationKeys,
  HD_GRP_RoutingKeys
} HD_KeyGroup;
#endif /* BRLTTY_INCLUDED_HD_BRLDEFS */ 
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