1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_X25_ASY_H
3 #define _LINUX_X25_ASY_H
4
5 /* X.25 asy configuration. */
6 #define SL_NRUNIT 256 /* MAX number of X.25 channels;
7 This can be overridden with
8 insmod -ox25_asy_maxdev=nnn */
9 #define SL_MTU 256
10
11 /* X25 async protocol characters. */
12 #define X25_END 0x7E /* indicates end of frame */
13 #define X25_ESC 0x7D /* indicates byte stuffing */
14 #define X25_ESCAPE(x) ((x)^0x20)
15 #define X25_UNESCAPE(x) ((x)^0x20)
16
17
18 struct x25_asy {
19 int magic;
20
21 /* Various fields. */
22 spinlock_t lock;
23 struct tty_struct *tty; /* ptr to TTY structure */
24 struct net_device *dev; /* easy for intr handling */
25
26 /* These are pointers to the malloc()ed frame buffers. */
27 unsigned char *rbuff; /* receiver buffer */
28 int rcount; /* received chars counter */
29 unsigned char *xbuff; /* transmitter buffer */
30 unsigned char *xhead; /* pointer to next byte to XMIT */
31 int xleft; /* bytes left in XMIT queue */
32 int buffsize; /* Max buffers sizes */
33
34 unsigned long flags; /* Flag values/ mode etc */
35 #define SLF_INUSE 0 /* Channel in use */
36 #define SLF_ESCAPE 1 /* ESC received */
37 #define SLF_ERROR 2 /* Parity, etc. error */
38 #define SLF_OUTWAIT 4 /* Waiting for output */
39 };
40
41
42
43 #define X25_ASY_MAGIC 0x5303
44
45 int x25_asy_init(struct net_device *dev);
46
47 #endif /* _LINUX_X25_ASY.H */