drivers/net/wan/x25_asy.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_X25_ASY_H
   3 #define _LINUX_X25_ASY_H
   4
   5 /* X.25 asy configuration. */
   6 #define SL_NRUNIT       256             /* MAX number of X.25 channels;
   7                                            This can be overridden with
   8                                            insmod -ox25_asy_maxdev=nnn  */
   9 #define SL_MTU          256
  10
  11 /* X25 async protocol characters. */
  12 #define X25_END         0x7E            /* indicates end of frame       */
  13 #define X25_ESC         0x7D            /* indicates byte stuffing      */
  14 #define X25_ESCAPE(x)   ((x)^0x20)
  15 #define X25_UNESCAPE(x) ((x)^0x20)
  16
  17
  18 struct x25_asy {
  19   int                   magic;
  20
  21   /* Various fields. */
  22   spinlock_t            lock;
  23   struct tty_struct     *tty;           /* ptr to TTY structure         */
  24   struct net_device     *dev;           /* easy for intr handling       */
  25
  26   /* These are pointers to the malloc()ed frame buffers. */
  27   unsigned char         *rbuff;         /* receiver buffer              */
  28   int                   rcount;         /* received chars counter       */
  29   unsigned char         *xbuff;         /* transmitter buffer           */
  30   unsigned char         *xhead;         /* pointer to next byte to XMIT */
  31   int                   xleft;          /* bytes left in XMIT queue     */
  32   int                   buffsize;       /* Max buffers sizes            */
  33
  34   unsigned long         flags;          /* Flag values/ mode etc        */
  35 #define SLF_INUSE       0               /* Channel in use               */
  36 #define SLF_ESCAPE      1               /* ESC received                 */
  37 #define SLF_ERROR       2               /* Parity, etc. error           */
  38 #define SLF_OUTWAIT     4               /* Waiting for output           */
  39 };
  40
  41
  42
  43 #define X25_ASY_MAGIC 0x5303
  44
  45 int x25_asy_init(struct net_device *dev);
  46
  47 #endif  /* _LINUX_X25_ASY.H */