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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_X25_ASY_H
#define _LINUX_X25_ASY_H
/* X.25 asy configuration. */
#define SL_NRUNIT 256 /* MAX number of X.25 channels;
This can be overridden with
insmod -ox25_asy_maxdev=nnn */
#define SL_MTU 256
/* X25 async protocol characters. */
#define X25_END 0x7E /* indicates end of frame */
#define X25_ESC 0x7D /* indicates byte stuffing */
#define X25_ESCAPE(x) ((x)^0x20)
#define X25_UNESCAPE(x) ((x)^0x20)
struct x25_asy {
int magic;
/* Various fields. */
spinlock_t lock;
struct tty_struct *tty; /* ptr to TTY structure */
struct net_device *dev; /* easy for intr handling */
/* These are pointers to the malloc()ed frame buffers. */
unsigned char *rbuff; /* receiver buffer */
int rcount; /* received chars counter */
unsigned char *xbuff; /* transmitter buffer */
unsigned char *xhead; /* pointer to next byte to XMIT */
int xleft; /* bytes left in XMIT queue */
int buffsize; /* Max buffers sizes */
unsigned long flags; /* Flag values/ mode etc */
#define SLF_INUSE 0 /* Channel in use */
#define SLF_ESCAPE 1 /* ESC received */
#define SLF_ERROR 2 /* Parity, etc. error */
};
#define X25_ASY_MAGIC 0x5303
int x25_asy_init(struct net_device *dev);
#endif /* _LINUX_X25_ASY.H */
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