sys/dev/ir/sir.h

   1 /*      $NetBSD: sir.h,v 1.6 2006/02/16 20:17:19 perry Exp $    */
   2
   3 /*
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Lennart Augustsson (lennart@augustsson.net) and Tommy Bohlin
   9  * (tommy@gatespace.com).
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Framing originally written by Tommy Bohlin.
  35  */
  36
  37 /* Protocol constants */
  38 #define SIR_EXTRA_BOF            0xff
  39 #define SIR_BOF                  0xc0
  40 #define SIR_CE                   0x7d
  41 #define SIR_EOF                  0xc1
  42
  43 #define SIR_ESC_BIT              0x20
  44
  45 int irda_sir_frame(u_int8_t *, u_int, struct uio *, u_int);
  46
  47 /*
  48  * CRC computation
  49  */
  50 #define INITFCS 0xffff
  51 #define GOODFCS 0xf0b8
  52
  53 extern const u_int16_t irda_fcstab[];
  54
  55 static __inline u_int16_t updateFCS(u_int16_t fcs, int c) {
  56         return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff];
  57 }