| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for ST5481 USB ISDN modem |
| 3 | * |
| 4 | * Author Frode Isaksen |
| 5 | * Copyright 2001 by Frode Isaksen <fisaksen@bewan.com> |
| 6 | * 2001 by Kai Germaschewski <kai.germaschewski@gmx.de> |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms |
| 9 | * of the GNU General Public License, incorporated herein by reference. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #ifndef __ST5481_HDLC_H__ |
| 14 | #define __ST5481_HDLC_H__ |
| 15 | |
| 16 | struct hdlc_vars { |
| 17 | int bit_shift; |
| 18 | int hdlc_bits1; |
| 19 | int data_bits; |
| 20 | int ffbit_shift; // encoding only |
| 21 | int state; |
| 22 | int dstpos; |
| 23 | |
| 24 | int data_received:1; // set if transferring data |
| 25 | int dchannel:1; // set if D channel (send idle instead of flags) |
| 26 | int do_adapt56:1; // set if 56K adaptation |
| 27 | int do_closing:1; // set if in closing phase (need to send CRC + flag |
| 28 | |
| 29 | unsigned short crc; |
| 30 | |
| 31 | unsigned char cbin; |
| 32 | unsigned char shift_reg; |
| 33 | unsigned char ffvalue; |
| 34 | |
| 35 | }; |
| 36 | |
| 37 | |
| 38 | /* |
| 39 | The return value from hdlc_decode is |
| 40 | the frame length, 0 if no complete frame was decoded, |
| 41 | or a negative error number |
| 42 | */ |
| 43 | |
| 44 | #define HDLC_FRAMING_ERROR 1 |
| 45 | #define HDLC_CRC_ERROR 2 |
| 46 | #define HDLC_LENGTH_ERROR 3 |
| 47 | |
| 48 | void |
| 49 | hdlc_rcv_init(struct hdlc_vars *hdlc, int do_adapt56); |
| 50 | |
| 51 | int |
| 52 | hdlc_decode(struct hdlc_vars *hdlc, const unsigned char *src, int slen,int *count, |
| 53 | unsigned char *dst, int dsize); |
| 54 | |
| 55 | void |
| 56 | hdlc_out_init(struct hdlc_vars *hdlc,int is_d_channel,int do_adapt56); |
| 57 | |
| 58 | int |
| 59 | hdlc_encode(struct hdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count, |
| 60 | unsigned char *dst,int dsize); |
| 61 | |
| 62 | #endif |