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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
| commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
| tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/isdn/hardware/mISDN/isdnhdlc.h | |
| parent | Initial commit. (diff) | |
| download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip | |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/isdn/hardware/mISDN/isdnhdlc.h')
| -rw-r--r-- | drivers/isdn/hardware/mISDN/isdnhdlc.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/mISDN/isdnhdlc.h b/drivers/isdn/hardware/mISDN/isdnhdlc.h new file mode 100644 index 000000000..fe2c1279c --- /dev/null +++ b/drivers/isdn/hardware/mISDN/isdnhdlc.h @@ -0,0 +1,69 @@ +/* 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 <keil@b1-systems.de> + * 2002 Wolfgang Mües <wolfgang@iksw-muees.de> + * 2001 Frode Isaksen <fisaksen@bewan.com> + * 2001 Kai Germaschewski <kai.germaschewski@gmx.de> + */ + +#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__ */ |