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Current File : /proc/5801/root/lib/modules/3.10.0-1160.76.1.el7.x86_64/source/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__ */

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