diff options
Diffstat (limited to 'include/linux/isdn/hdlc.h')
| -rw-r--r-- | include/linux/isdn/hdlc.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/include/linux/isdn/hdlc.h b/include/linux/isdn/hdlc.h new file mode 100644 index 000000000000..4b3ecc40889a --- /dev/null +++ b/include/linux/isdn/hdlc.h | |||
| @@ -0,0 +1,82 @@ | |||
| 1 | /* | ||
| 2 | * hdlc.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. | ||
| 7 | * | ||
| 8 | * Copyright (C) | ||
| 9 | * 2009 Karsten Keil <keil@b1-systems.de> | ||
| 10 | * 2002 Wolfgang Mües <wolfgang@iksw-muees.de> | ||
| 11 | * 2001 Frode Isaksen <fisaksen@bewan.com> | ||
| 12 | * 2001 Kai Germaschewski <kai.germaschewski@gmx.de> | ||
| 13 | * | ||
| 14 | * This program is free software; you can redistribute it and/or modify | ||
| 15 | * it under the terms of the GNU General Public License as published by | ||
| 16 | * the Free Software Foundation; either version 2 of the License, or | ||
| 17 | * (at your option) any later version. | ||
| 18 | * | ||
| 19 | * This program is distributed in the hope that it will be useful, | ||
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 22 | * GNU General Public License for more details. | ||
| 23 | * | ||
| 24 | * You should have received a copy of the GNU General Public License | ||
| 25 | * along with this program; if not, write to the Free Software | ||
| 26 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 27 | */ | ||
| 28 | |||
| 29 | #ifndef __ISDNHDLC_H__ | ||
| 30 | #define __ISDNHDLC_H__ | ||
| 31 | |||
| 32 | struct isdnhdlc_vars { | ||
| 33 | int bit_shift; | ||
| 34 | int hdlc_bits1; | ||
| 35 | int data_bits; | ||
| 36 | int ffbit_shift; /* encoding only */ | ||
| 37 | int state; | ||
| 38 | int dstpos; | ||
| 39 | |||
| 40 | u16 crc; | ||
| 41 | |||
| 42 | u8 cbin; | ||
| 43 | u8 shift_reg; | ||
| 44 | u8 ffvalue; | ||
| 45 | |||
| 46 | /* set if transferring data */ | ||
| 47 | u32 data_received:1; | ||
| 48 | /* set if D channel (send idle instead of flags) */ | ||
| 49 | u32 dchannel:1; | ||
| 50 | /* set if 56K adaptation */ | ||
| 51 | u32 do_adapt56:1; | ||
| 52 | /* set if in closing phase (need to send CRC + flag) */ | ||
| 53 | u32 do_closing:1; | ||
| 54 | /* set if data is bitreverse */ | ||
| 55 | u32 do_bitreverse:1; | ||
| 56 | }; | ||
| 57 | |||
| 58 | /* Feature Flags */ | ||
| 59 | #define HDLC_56KBIT 0x01 | ||
| 60 | #define HDLC_DCHANNEL 0x02 | ||
| 61 | #define HDLC_BITREVERSE 0x04 | ||
| 62 | |||
| 63 | /* | ||
| 64 | The return value from isdnhdlc_decode is | ||
| 65 | the frame length, 0 if no complete frame was decoded, | ||
| 66 | or a negative error number | ||
| 67 | */ | ||
| 68 | #define HDLC_FRAMING_ERROR 1 | ||
| 69 | #define HDLC_CRC_ERROR 2 | ||
| 70 | #define HDLC_LENGTH_ERROR 3 | ||
| 71 | |||
| 72 | extern void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features); | ||
| 73 | |||
| 74 | extern int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src, | ||
| 75 | int slen, int *count, u8 *dst, int dsize); | ||
| 76 | |||
| 77 | extern void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features); | ||
| 78 | |||
| 79 | extern int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, | ||
| 80 | u16 slen, int *count, u8 *dst, int dsize); | ||
| 81 | |||
| 82 | #endif /* __ISDNHDLC_H__ */ | ||