| /* 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 */ |
