drivers/net/wan/x25_asy.h

   1 #ifndef _LINUX_X25_ASY_H
   2 #define _LINUX_X25_ASY_H
   3
   4 /* X.25 asy configuration. */
   5 #define SL_NRUNIT       256             /* MAX number of X.25 channels;
   6                                            This can be overridden with
   7                                            insmod -ox25_asy_maxdev=nnn  */
   8 #define SL_MTU          256
   9
  10 /* X25 async protocol characters. */
  11 #define X25_END         0x7E            /* indicates end of frame       */
  12 #define X25_ESC         0x7D            /* indicates byte stuffing      */
  13 #define X25_ESCAPE(x)   ((x)^0x20)
  14 #define X25_UNESCAPE(x) ((x)^0x20)
  15
  16
  17 struct x25_asy {
  18   int                   magic;
  19
  20   /* Various fields. */
  21   spinlock_t            lock;
  22   struct tty_struct     *tty;           /* ptr to TTY structure         */
  23   struct net_device     *dev;           /* easy for intr handling       */
  24
  25   /* These are pointers to the malloc()ed frame buffers. */
  26   unsigned char         *rbuff;         /* receiver buffer              */
  27   int                   rcount;         /* received chars counter       */
  28   unsigned char         *xbuff;         /* transmitter buffer           */
  29   unsigned char         *xhead;         /* pointer to next byte to XMIT */
  30   int                   xleft;          /* bytes left in XMIT queue     */
  31
  32   /* X.25 interface statistics. */
  33   struct net_device_stats stats;
  34
  35   int                   buffsize;       /* Max buffers sizes            */
  36
  37   unsigned long         flags;          /* Flag values/ mode etc        */
  38 #define SLF_INUSE       0               /* Channel in use               */
  39 #define SLF_ESCAPE      1               /* ESC received                 */
  40 #define SLF_ERROR       2               /* Parity, etc. error           */
  41 #define SLF_OUTWAIT     4               /* Waiting for output           */
  42 };
  43
  44
  45
  46 #define X25_ASY_MAGIC 0x5303
  47
  48 extern int x25_asy_init(struct net_device *dev);
  49
  50 #endif  /* _LINUX_X25_ASY.H */