Release 4.7 include/linux/isdn/hdlc.h

/*
 * hdlc.h  --  General purpose ISDN HDLC decoder.
 *
 * Implementation of a HDLC decoder/encoder in software.
 * Necessary because some ISDN devices don't have HDLC
 * controllers.
 *
 * Copyright (C)
 *      2009    Karsten Keil            <keil@b1-systems.de>
 *      2002    Wolfgang Mües          <wolfgang@iksw-muees.de>
 *      2001    Frode Isaksen           <fisaksen@bewan.com>
 *      2001    Kai Germaschewski       <kai.germaschewski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __ISDNHDLC_H__

#define __ISDNHDLC_H__


struct isdnhdlc_vars {
	
int bit_shift;
	
int hdlc_bits1;
	
int data_bits;
	
int ffbit_shift;	/* encoding only */
	
int state;
	
int dstpos;

	
u16 crc;

	
u8 cbin;
	
u8 shift_reg;
	
u8 ffvalue;

	/* set if transferring data */
	
u32 data_received:1;
	/* set if D channel (send idle instead of flags) */
	
u32 dchannel:1;
	/* set if 56K adaptation */
	
u32 do_adapt56:1;
	/* set if in closing phase (need to send CRC + flag) */
	
u32 do_closing:1;
	/* set if data is bitreverse */
	
u32 do_bitreverse:1;
};

/* Feature Flags */

#define HDLC_56KBIT	0x01

#define HDLC_DCHANNEL	0x02

#define HDLC_BITREVERSE	0x04

/*
  The return value from isdnhdlc_decode is
  the frame length, 0 if no complete frame was decoded,
  or a negative error number
*/

#define HDLC_FRAMING_ERROR     1

#define HDLC_CRC_ERROR         2

#define HDLC_LENGTH_ERROR      3

extern void	isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features);

extern int	isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src,
			int slen, int *count, u8 *dst, int dsize);

extern void	isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features);

extern int	isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src,
			u16 slen, int *count, u8 *dst, int dsize);

#endif /* __ISDNHDLC_H__ */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew morton
andrew morton
144
77.42%
1
25.00%
karsten keil
karsten keil
41
22.04%
2
50.00%
lucas de marchi
lucas de marchi
1
0.54%
1
25.00%
Total
186
100.00%
4
100.00%
  
Directory: include/linux/isdn

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