Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * hdlc.h  --  General purpose ISDN HDLC decoder.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Implementation of a HDLC decoder/encoder in software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Necessary because some ISDN devices don't have HDLC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * controllers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Copyright (C)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *	2009	Karsten Keil		<keil@b1-systems.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *	2002	Wolfgang Mües		<wolfgang@iksw-muees.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *	2001	Frode Isaksen		<fisaksen@bewan.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *	2001	Kai Germaschewski	<kai.germaschewski@gmx.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #ifndef __ISDNHDLC_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define __ISDNHDLC_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct isdnhdlc_vars {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int bit_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	int hdlc_bits1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	int data_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	int ffbit_shift;	/* encoding only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	int state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	int dstpos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	u16 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	u8 cbin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	u8 shift_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	u8 ffvalue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	/* set if transferring data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	u32 data_received:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	/* set if D channel (send idle instead of flags) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	u32 dchannel:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	/* set if 56K adaptation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	u32 do_adapt56:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	/* set if in closing phase (need to send CRC + flag) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	u32 do_closing:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	/* set if data is bitreverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	u32 do_bitreverse:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* Feature Flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define HDLC_56KBIT	0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define HDLC_DCHANNEL	0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define HDLC_BITREVERSE	0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)   The return value from isdnhdlc_decode is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)   the frame length, 0 if no complete frame was decoded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)   or a negative error number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define HDLC_FRAMING_ERROR     1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #define HDLC_CRC_ERROR         2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define HDLC_LENGTH_ERROR      3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) extern void	isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) extern int	isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 			int slen, int *count, u8 *dst, int dsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) extern void	isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) extern int	isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 			u16 slen, int *count, u8 *dst, int dsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #endif /* __ISDNHDLC_H__ */