x25_asy.h

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#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

extern int x25_asy_init(struct net_device *dev);

#endif  /* _LINUX_X25_ASY.H */