ISDN: Make isdnhdlc usable for other ISDN drivers

isdnhdlc is useful for other ISDN drivers as well.
Move the include file to a central location and the source
to the central isdn location.

Signed-off-by: Karsten Keil <keil@b1-systems.de>

1 files changed, 70 insertions, 0 deletions

diff --git a/include/linux/isdn/hdlc.h b/include/linux/isdn/hdlc.h
new file mode 100644
index 000000000000..cf0a95a24015
--- /dev/null
+++ b/include/linux/isdn/hdlc.h
@@ -0,0 +1,70 @@
+/*
+ * 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;
+
+        unsigned int data_received:1;   // set if transferring data
+        unsigned int dchannel:1;        // set if D channel (send idle instead of flags)
+        unsigned int do_adapt56:1;      // set if 56K adaptation
+        unsigned 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 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__ */