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      1 /*	$NetBSD: sir.h,v 1.8 2013/05/27 16:23:20 kiyohara 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 (at) augustsson.net) and Tommy Bohlin
      9  * (tommy (at) 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 enum framefsmstate {
     46 	FSTATE_END_OF_FRAME,
     47 	FSTATE_START_OF_FRAME,
     48 	FSTATE_IN_DATA,
     49 	FSTATE_IN_END
     50 };
     51 
     52 enum frameresult {
     53 	FR_IDLE,
     54 	FR_INPROGRESS,
     55 	FR_FRAMEOK,
     56 	FR_FRAMEBADFCS,
     57 	FR_FRAMEMALFORMED,
     58 	FR_BUFFEROVERRUN
     59 };
     60 
     61 struct framestate {
     62 	u_int8_t *buffer;
     63 	size_t buflen;
     64 	size_t bufindex;
     65 
     66 	enum framefsmstate fsmstate;
     67 	u_int escaped;
     68 	u_int state_index;
     69 };
     70 
     71 #define deframe_isclear(fs) ((fs)->fsmstate == FSTATE_END_OF_FRAME)
     72 
     73 int irda_sir_frame(u_int8_t *, u_int, struct uio *, u_int);
     74 void deframe_init(struct framestate *, u_int8_t *, size_t);
     75 void deframe_clear(struct framestate *);
     76 enum frameresult deframe_process(struct framestate *, u_int8_t const **,
     77 				 size_t *);
     78 
     79 /*
     80  * CRC computation
     81  */
     82 #define INITFCS 0xffff
     83 #define GOODFCS 0xf0b8
     84 
     85 extern const u_int16_t irda_fcstab[];
     86 
     87 static __inline u_int16_t updateFCS(u_int16_t fcs, int c) {
     88 	return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff];
     89 }
     90 
     91 u_int32_t crc_ccitt_16(u_int32_t, u_int8_t const*, size_t);
     92