| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * 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 <[email protected]>
- * 2002 Wolfgang Mües <[email protected]>
- * 2001 Frode Isaksen <[email protected]>
- * 2001 Kai Germaschewski <[email protected]>
- */
- #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__ */
|
