diff options
Diffstat (limited to 'drivers/net/wan/x25_asy.h')
| -rw-r--r-- | drivers/net/wan/x25_asy.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/net/wan/x25_asy.h b/drivers/net/wan/x25_asy.h new file mode 100644 index 000000000..eb4a4216e --- /dev/null +++ b/drivers/net/wan/x25_asy.h @@ -0,0 +1,47 @@ +/* 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 SLF_OUTWAIT 4 /* Waiting for output */ +}; + + + +#define X25_ASY_MAGIC 0x5303 + +int x25_asy_init(struct net_device *dev); + +#endif /* _LINUX_X25_ASY.H */ |