patch-2.4.21 linux-2.4.21/drivers/isdn/hisax/isdnhdlc.h

• Lines: 73
• Date: 2003-06-13 07:51:34.000000000 -0700
• Orig file: linux-2.4.20/drivers/isdn/hisax/isdnhdlc.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/isdn/hisax/isdnhdlc.h linux-2.4.21/drivers/isdn/hisax/isdnhdlc.h
@@ -0,0 +1,72 @@
+/*
+ * isdnhdlc.h  --  General purpose ISDN HDLC decoder.
+ *
+ * Implementation of a HDLC decoder/encoder in software.
+ * Neccessary because some ISDN devices don't have HDLC
+ * controllers. Also included: a bit reversal table.
+ *
+ *Copyright (C) 2002    Wolfgang Mües      <wolfgang@iksw-muees.de>
+ *		2001 	Frode Isaksen      <fisaksen@bewan.com>
+ *              2001 	Kai Germaschewski  <kai.germaschewski@gmx.de>
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#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;
+
+	unsigned short crc;
+
+	unsigned char cbin;
+	unsigned char shift_reg;
+	unsigned char ffvalue;
+
+	int data_received:1; 	// set if transferring data
+	int dchannel:1; 	// set if D channel (send idle instead of flags)
+	int do_adapt56:1; 	// set if 56K adaptation
+        int do_closing:1; 	// set if in closing phase (need to send CRC + flag
+};
+
+
+/*
+  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 const unsigned char isdnhdlc_bit_rev_tab[256];
+
+extern void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56);
+
+extern int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src, int slen,int *count,
+	                    unsigned char *dst, int dsize);
+
+extern void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc,int is_d_channel,int do_adapt56);
+
+extern int isdnhdlc_encode (struct isdnhdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count,
+	                    unsigned char *dst,int dsize);
+
+#endif /* __ISDNHDLC_H__ */