diff options
Diffstat (limited to 'include/linux/isdn')
| -rw-r--r-- | include/linux/isdn/hdlc.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/include/linux/isdn/hdlc.h b/include/linux/isdn/hdlc.h new file mode 100644 index 000000000000..cf0a95a24015 --- /dev/null +++ b/include/linux/isdn/hdlc.h | |||
| @@ -0,0 +1,70 @@ | |||
| 1 | /* | ||
| 2 | * isdnhdlc.h -- General purpose ISDN HDLC decoder. | ||
| 3 | * | ||
| 4 | * Implementation of a HDLC decoder/encoder in software. | ||
| 5 | * Neccessary because some ISDN devices don't have HDLC | ||
| 6 | * controllers. Also included: a bit reversal table. | ||
| 7 | * | ||
| 8 | *Copyright (C) 2002 Wolfgang Mües <wolfgang@iksw-muees.de> | ||
| 9 | * 2001 Frode Isaksen <fisaksen@bewan.com> | ||
| 10 | * 2001 Kai Germaschewski <kai.germaschewski@gmx.de> | ||
| 11 | * | ||
| 12 | * This program is free software; you can redistribute it and/or modify | ||
| 13 | * it under the terms of the GNU General Public License as published by | ||
| 14 | * the Free Software Foundation; either version 2 of the License, or | ||
| 15 | * (at your option) any later version. | ||
| 16 | * | ||
| 17 | * This program is distributed in the hope that it will be useful, | ||
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 20 | * GNU General Public License for more details. | ||
| 21 | * | ||
| 22 | * You should have received a copy of the GNU General Public License | ||
| 23 | * along with this program; if not, write to the Free Software | ||
| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 25 | */ | ||
| 26 | |||
| 27 | #ifndef __ISDNHDLC_H__ | ||
| 28 | #define __ISDNHDLC_H__ | ||
| 29 | |||
| 30 | struct isdnhdlc_vars { | ||
| 31 | int bit_shift; | ||
| 32 | int hdlc_bits1; | ||
| 33 | int data_bits; | ||
| 34 | int ffbit_shift; // encoding only | ||
| 35 | int state; | ||
| 36 | int dstpos; | ||
| 37 | |||
| 38 | unsigned short crc; | ||
| 39 | |||
| 40 | unsigned char cbin; | ||
| 41 | unsigned char shift_reg; | ||
| 42 | unsigned char ffvalue; | ||
| 43 | |||
| 44 | unsigned int data_received:1; // set if transferring data | ||
| 45 | unsigned int dchannel:1; // set if D channel (send idle instead of flags) | ||
| 46 | unsigned int do_adapt56:1; // set if 56K adaptation | ||
| 47 | unsigned int do_closing:1; // set if in closing phase (need to send CRC + flag | ||
| 48 | }; | ||
| 49 | |||
| 50 | |||
| 51 | /* | ||
| 52 | The return value from isdnhdlc_decode is | ||
| 53 | the frame length, 0 if no complete frame was decoded, | ||
| 54 | or a negative error number | ||
| 55 | */ | ||
| 56 | #define HDLC_FRAMING_ERROR 1 | ||
| 57 | #define HDLC_CRC_ERROR 2 | ||
| 58 | #define HDLC_LENGTH_ERROR 3 | ||
| 59 | |||
| 60 | extern void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56); | ||
| 61 | |||
| 62 | extern int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src, int slen,int *count, | ||
| 63 | unsigned char *dst, int dsize); | ||
| 64 | |||
| 65 | extern void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc,int is_d_channel,int do_adapt56); | ||
| 66 | |||
| 67 | extern int isdnhdlc_encode (struct isdnhdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count, | ||
| 68 | unsigned char *dst,int dsize); | ||
| 69 | |||
| 70 | #endif /* __ISDNHDLC_H__ */ | ||