include/linux/isdn.h

   1 /* $Id: isdn.h,v 1.125.2.3 2004/02/10 01:07:14 keil Exp $
   2  *
   3  * Main header for the Linux ISDN subsystem (linklevel).
   4  *
   5  * Copyright 1994,95,96 by Fritz Elfert (fritz@isdn4linux.de)
   6  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13 #ifndef __ISDN_H__
  14 #define __ISDN_H__
  15
  16
  17 #include <linux/errno.h>
  18 #include <linux/fs.h>
  19 #include <linux/major.h>
  20 #include <asm/io.h>
  21 #include <linux/kernel.h>
  22 #include <linux/signal.h>
  23 #include <linux/slab.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/serial_reg.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/ip.h>
  33 #include <linux/in.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/tcp.h>
  38 #include <linux/mutex.h>
  39 #include <uapi/linux/isdn.h>
  40
  41 #define ISDN_TTY_MAJOR    43
  42 #define ISDN_TTYAUX_MAJOR 44
  43 #define ISDN_MAJOR        45
  44
  45 /* The minor-devicenumbers for Channel 0 and 1 are used as arguments for
  46  * physical Channel-Mapping, so they MUST NOT be changed without changing
  47  * the correspondent code in isdn.c
  48  */
  49
  50 #define ISDN_MINOR_B        0
  51 #define ISDN_MINOR_BMAX     (ISDN_MAX_CHANNELS-1)
  52 #define ISDN_MINOR_CTRL     64
  53 #define ISDN_MINOR_CTRLMAX  (64 + (ISDN_MAX_CHANNELS-1))
  54 #define ISDN_MINOR_PPP      128
  55 #define ISDN_MINOR_PPPMAX   (128 + (ISDN_MAX_CHANNELS-1))
  56 #define ISDN_MINOR_STATUS   255
  57
  58 #ifdef CONFIG_ISDN_PPP
  59
  60 #ifdef CONFIG_ISDN_PPP_VJ
  61 #  include <net/slhc_vj.h>
  62 #endif
  63
  64 #include <linux/ppp_defs.h>
  65 #include <linux/ppp-ioctl.h>
  66
  67 #include <linux/isdn_ppp.h>
  68 #endif
  69
  70 #ifdef CONFIG_ISDN_X25
  71 #  include <linux/concap.h>
  72 #endif
  73
  74 #include <linux/isdnif.h>
  75
  76 #define ISDN_DRVIOCTL_MASK       0x7f  /* Mask for Device-ioctl */
  77
  78 /* Until now unused */
  79 #define ISDN_SERVICE_VOICE 1
  80 #define ISDN_SERVICE_AB    1<<1
  81 #define ISDN_SERVICE_X21   1<<2
  82 #define ISDN_SERVICE_G4    1<<3
  83 #define ISDN_SERVICE_BTX   1<<4
  84 #define ISDN_SERVICE_DFUE  1<<5
  85 #define ISDN_SERVICE_X25   1<<6
  86 #define ISDN_SERVICE_TTX   1<<7
  87 #define ISDN_SERVICE_MIXED 1<<8
  88 #define ISDN_SERVICE_FW    1<<9
  89 #define ISDN_SERVICE_GTEL  1<<10
  90 #define ISDN_SERVICE_BTXN  1<<11
  91 #define ISDN_SERVICE_BTEL  1<<12
  92
  93 /* Macros checking plain usage */
  94 #define USG_NONE(x)         ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NONE)
  95 #define USG_RAW(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_RAW)
  96 #define USG_MODEM(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM)
  97 #define USG_VOICE(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)
  98 #define USG_NET(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NET)
  99 #define USG_FAX(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_FAX)
 100 #define USG_OUTGOING(x)     ((x & ISDN_USAGE_OUTGOING)==ISDN_USAGE_OUTGOING)
 101 #define USG_MODEMORVOICE(x) (((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM) || \
 102                              ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)     )
 103
 104 /* Timer-delays and scheduling-flags */
 105 #define ISDN_TIMER_RES         4                         /* Main Timer-Resolution   */
 106 #define ISDN_TIMER_02SEC       (HZ/ISDN_TIMER_RES/5)     /* Slow-Timer1 .2 sec      */
 107 #define ISDN_TIMER_1SEC        (HZ/ISDN_TIMER_RES)       /* Slow-Timer2 1 sec       */
 108 #define ISDN_TIMER_RINGING     5 /* tty RINGs = ISDN_TIMER_1SEC * this factor       */
 109 #define ISDN_TIMER_KEEPINT    10 /* Cisco-Keepalive = ISDN_TIMER_1SEC * this factor */
 110 #define ISDN_TIMER_MODEMREAD   1
 111 #define ISDN_TIMER_MODEMPLUS   2
 112 #define ISDN_TIMER_MODEMRING   4
 113 #define ISDN_TIMER_MODEMXMIT   8
 114 #define ISDN_TIMER_NETDIAL    16
 115 #define ISDN_TIMER_NETHANGUP  32
 116 #define ISDN_TIMER_CARRIER   256 /* Wait for Carrier */
 117 #define ISDN_TIMER_FAST      (ISDN_TIMER_MODEMREAD | ISDN_TIMER_MODEMPLUS | \
 118                               ISDN_TIMER_MODEMXMIT)
 119 #define ISDN_TIMER_SLOW      (ISDN_TIMER_MODEMRING | ISDN_TIMER_NETHANGUP | \
 120                               ISDN_TIMER_NETDIAL | ISDN_TIMER_CARRIER)
 121
 122 /* Timeout-Values for isdn_net_dial() */
 123 #define ISDN_TIMER_DTIMEOUT10 (10*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
 124 #define ISDN_TIMER_DTIMEOUT15 (15*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
 125 #define ISDN_TIMER_DTIMEOUT60 (60*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
 126
 127 /* GLOBAL_FLAGS */
 128 #define ISDN_GLOBAL_STOPPED 1
 129
 130 /*=================== Start of ip-over-ISDN stuff =========================*/
 131
 132 /* Feature- and status-flags for a net-interface */
 133 #define ISDN_NET_CONNECTED  0x01       /* Bound to ISDN-Channel             */
 134 #define ISDN_NET_SECURE     0x02       /* Accept calls from phonelist only  */
 135 #define ISDN_NET_CALLBACK   0x04       /* activate callback                 */
 136 #define ISDN_NET_CBHUP      0x08       /* hangup before callback            */
 137 #define ISDN_NET_CBOUT      0x10       /* remote machine does callback      */
 138
 139 #define ISDN_NET_MAGIC      0x49344C02 /* for paranoia-checking             */
 140
 141 /* Phone-list-element */
 142 typedef struct {
 143   void *next;
 144   char num[ISDN_MSNLEN];
 145 } isdn_net_phone;
 146
 147 /*
 148    Principles when extending structures for generic encapsulation protocol
 149    ("concap") support:
 150    - Stuff which is hardware specific (here i4l-specific) goes in
 151      the netdev -> local structure (here: isdn_net_local)
 152    - Stuff which is encapsulation protocol specific goes in the structure
 153      which holds the linux device structure (here: isdn_net_device)
 154 */
 155
 156 /* Local interface-data */
 157 typedef struct isdn_net_local_s {
 158   ulong                  magic;
 159   struct net_device_stats stats;       /* Ethernet Statistics              */
 160   int                    isdn_device;  /* Index to isdn-device             */
 161   int                    isdn_channel; /* Index to isdn-channel            */
 162   int                    ppp_slot;     /* PPPD device slot number          */
 163   int                    pre_device;   /* Preselected isdn-device          */
 164   int                    pre_channel;  /* Preselected isdn-channel         */
 165   int                    exclusive;    /* If non-zero idx to reserved chan.*/
 166   int                    flags;        /* Connection-flags                 */
 167   int                    dialretry;    /* Counter for Dialout-retries      */
 168   int                    dialmax;      /* Max. Number of Dial-retries      */
 169   int                    cbdelay;      /* Delay before Callback starts     */
 170   int                    dtimer;       /* Timeout-counter for dialing      */
 171   char                   msn[ISDN_MSNLEN]; /* MSNs/EAZs for this interface */
 172   u_char                 cbhup;        /* Flag: Reject Call before Callback*/
 173   u_char                 dialstate;    /* State for dialing                */
 174   u_char                 p_encap;      /* Packet encapsulation             */
 175                                        /*   0 = Ethernet over ISDN         */
 176                                        /*   1 = RAW-IP                     */
 177                                        /*   2 = IP with type field         */
 178   u_char                 l2_proto;     /* Layer-2-protocol                 */
 179                                        /* See ISDN_PROTO_L2..-constants in */
 180                                        /* isdnif.h                         */
 181                                        /*   0 = X75/LAPB with I-Frames     */
 182                                        /*   1 = X75/LAPB with UI-Frames    */
 183                                        /*   2 = X75/LAPB with BUI-Frames   */
 184                                        /*   3 = HDLC                       */
 185   u_char                 l3_proto;     /* Layer-3-protocol                 */
 186                                        /* See ISDN_PROTO_L3..-constants in */
 187                                        /* isdnif.h                         */
 188                                        /*   0 = Transparent                */
 189   int                    huptimer;     /* Timeout-counter for auto-hangup  */
 190   int                    charge;       /* Counter for charging units       */
 191   ulong                  chargetime;   /* Timer for Charging info          */
 192   int                    hupflags;     /* Flags for charge-unit-hangup:    */
 193                                        /* bit0: chargeint is invalid       */
 194                                        /* bit1: Getting charge-interval    */
 195                                        /* bit2: Do charge-unit-hangup      */
 196                                        /* bit3: Do hangup even on incoming */
 197   int                    outgoing;     /* Flag: outgoing call              */
 198   int                    onhtime;      /* Time to keep link up             */
 199   int                    chargeint;    /* Interval between charge-infos    */
 200   int                    onum;         /* Flag: at least 1 outgoing number */
 201   int                    cps;          /* current speed of this interface  */
 202   int                    transcount;   /* byte-counter for cps-calculation */
 203   int                    sqfull;       /* Flag: netdev-queue overloaded    */
 204   ulong                  sqfull_stamp; /* Start-Time of overload           */
 205   ulong                  slavedelay;   /* Dynamic bundling delaytime       */
 206   int                    triggercps;   /* BogoCPS needed for trigger slave */
 207   isdn_net_phone         *phone[2];    /* List of remote-phonenumbers      */
 208                                        /* phone[0] = Incoming Numbers      */
 209                                        /* phone[1] = Outgoing Numbers      */
 210   isdn_net_phone         *dial;        /* Pointer to dialed number         */
 211   struct net_device      *master;      /* Ptr to Master device for slaves  */
 212   struct net_device      *slave;       /* Ptr to Slave device for masters  */
 213   struct isdn_net_local_s *next;       /* Ptr to next link in bundle       */
 214   struct isdn_net_local_s *last;       /* Ptr to last link in bundle       */
 215   struct isdn_net_dev_s  *netdev;      /* Ptr to netdev                    */
 216   struct sk_buff_head    super_tx_queue; /* List of supervisory frames to  */
 217                                        /* be transmitted asap              */
 218   atomic_t frame_cnt;                  /* number of frames currently       */
 219                                        /* queued in HL driver              */
 220                                        /* Ptr to orig. hard_header_cache   */
 221   spinlock_t             xmit_lock;    /* used to protect the xmit path of */
 222                                        /* a particular channel (including  */
 223                                        /* the frame_cnt                    */
 224
 225   int  pppbind;                        /* ippp device for bindings         */
 226   int                                   dialtimeout;    /* How long shall we try on dialing? (jiffies) */
 227   int                                   dialwait;               /* How long shall we wait after failed attempt? (jiffies) */
 228   ulong                                 dialstarted;    /* jiffies of first dialing-attempt */
 229   ulong                                 dialwait_timer; /* jiffies of earliest next dialing-attempt */
 230   int                                   huptimeout;             /* How long will the connection be up? (seconds) */
 231 #ifdef CONFIG_ISDN_X25
 232   struct concap_device_ops *dops;      /* callbacks used by encapsulator   */
 233 #endif
 234   /* use an own struct for that in later versions */
 235   ulong cisco_myseq;                   /* Local keepalive seq. for Cisco   */
 236   ulong cisco_mineseen;                /* returned keepalive seq. from remote */
 237   ulong cisco_yourseq;                 /* Remote keepalive seq. for Cisco  */
 238   int cisco_keepalive_period;           /* keepalive period */
 239   ulong cisco_last_slarp_in;            /* jiffie of last keepalive packet we received */
 240   char cisco_line_state;                /* state of line according to keepalive packets */
 241   char cisco_debserint;                 /* debugging flag of cisco hdlc with slarp */
 242   struct timer_list cisco_timer;
 243   struct work_struct tqueue;
 244 } isdn_net_local;
 245
 246 /* the interface itself */
 247 typedef struct isdn_net_dev_s {
 248   isdn_net_local *local;
 249   isdn_net_local *queue;               /* circular list of all bundled
 250                                           channels, which are currently
 251                                           online                           */
 252   spinlock_t queue_lock;               /* lock to protect queue            */
 253   void *next;                          /* Pointer to next isdn-interface   */
 254   struct net_device *dev;              /* interface to upper levels        */
 255 #ifdef CONFIG_ISDN_PPP
 256   ippp_bundle * pb;             /* pointer to the common bundle structure
 257                                  * with the per-bundle data */
 258 #endif
 259 #ifdef CONFIG_ISDN_X25
 260   struct concap_proto  *cprot; /* connection oriented encapsulation protocol */
 261 #endif
 262
 263 } isdn_net_dev;
 264
 265 /*===================== End of ip-over-ISDN stuff ===========================*/
 266
 267 /*======================= Start of ISDN-tty stuff ===========================*/
 268
 269 #define ISDN_ASYNC_MAGIC          0x49344C01 /* for paranoia-checking        */
 270 #define ISDN_SERIAL_XMIT_SIZE           1024 /* Default bufsize for write    */
 271 #define ISDN_SERIAL_XMIT_MAX            4000 /* Maximum bufsize for write    */
 272
 273 #ifdef CONFIG_ISDN_AUDIO
 274 /* For using sk_buffs with audio we need some private variables
 275  * within each sk_buff. For this purpose, we declare a struct here,
 276  * and put it always at the private skb->cb data array. A few macros help
 277  * accessing the variables.
 278  */
 279 typedef struct _isdn_audio_data {
 280   unsigned short dle_count;
 281   unsigned char  lock;
 282 } isdn_audio_data_t;
 283
 284 #define ISDN_AUDIO_SKB_DLECOUNT(skb)    (((isdn_audio_data_t *)&skb->cb[0])->dle_count)
 285 #define ISDN_AUDIO_SKB_LOCK(skb)        (((isdn_audio_data_t *)&skb->cb[0])->lock)
 286 #endif
 287
 288 /* Private data of AT-command-interpreter */
 289 typedef struct atemu {
 290         u_char       profile[ISDN_MODEM_NUMREG]; /* Modem-Regs. Profile 0              */
 291         u_char       mdmreg[ISDN_MODEM_NUMREG];  /* Modem-Registers                    */
 292         char         pmsn[ISDN_MSNLEN];          /* EAZ/MSNs Profile 0                 */
 293         char         msn[ISDN_MSNLEN];           /* EAZ/MSN                            */
 294         char         plmsn[ISDN_LMSNLEN];        /* Listening MSNs Profile 0           */
 295         char         lmsn[ISDN_LMSNLEN];         /* Listening MSNs                     */
 296         char         cpn[ISDN_MSNLEN];           /* CalledPartyNumber on incoming call */
 297         char         connmsg[ISDN_CMSGLEN];      /* CONNECT-Msg from HL-Driver         */
 298 #ifdef CONFIG_ISDN_AUDIO
 299         u_char       vpar[10];                   /* Voice-parameters                   */
 300         int          lastDLE;                    /* Flag for voice-coding: DLE seen    */
 301 #endif
 302         int          mdmcmdl;                    /* Length of Modem-Commandbuffer      */
 303         int          pluscount;                  /* Counter for +++ sequence           */
 304         u_long       lastplus;                   /* Timestamp of last +                */
 305         int          carrierwait;                /* Seconds of carrier waiting         */
 306         char         mdmcmd[255];                /* Modem-Commandbuffer                */
 307         unsigned int charge;                     /* Charge units of current connection */
 308 } atemu;
 309
 310 /* Private data (similar to async_struct in <linux/serial.h>) */
 311 typedef struct modem_info {
 312   int                   magic;
 313   struct tty_port       port;
 314   int                   x_char;          /* xon/xoff character             */
 315   int                   mcr;             /* Modem control register         */
 316   int                   msr;             /* Modem status register          */
 317   int                   lsr;             /* Line status register           */
 318   int                   line;
 319   int                   online;          /* 1 = B-Channel is up, drop data */
 320                                          /* 2 = B-Channel is up, deliver d.*/
 321   int                   dialing;         /* Dial in progress or ATA        */
 322   int                   closing;
 323   int                   rcvsched;        /* Receive needs schedule         */
 324   int                   isdn_driver;     /* Index to isdn-driver           */
 325   int                   isdn_channel;    /* Index to isdn-channel          */
 326   int                   drv_index;       /* Index to dev->usage            */
 327   int                   ncarrier;        /* Flag: schedule NO CARRIER      */
 328   unsigned char         last_cause[8];   /* Last cause message             */
 329   unsigned char         last_num[ISDN_MSNLEN];
 330                                          /* Last phone-number              */
 331   unsigned char         last_l2;         /* Last layer-2 protocol          */
 332   unsigned char         last_si;         /* Last service                   */
 333   unsigned char         last_lhup;       /* Last hangup local?             */
 334   unsigned char         last_dir;        /* Last direction (in or out)     */
 335   struct timer_list     nc_timer;        /* Timer for delayed NO CARRIER   */
 336   int                   send_outstanding;/* # of outstanding send-requests */
 337   int                   xmit_size;       /* max. # of chars in xmit_buf    */
 338   int                   xmit_count;      /* # of chars in xmit_buf         */
 339   struct sk_buff_head   xmit_queue;      /* transmit queue                 */
 340   atomic_t              xmit_lock;       /* Semaphore for isdn_tty_write   */
 341 #ifdef CONFIG_ISDN_AUDIO
 342   int                   vonline;         /* Voice-channel status           */
 343                                          /* Bit 0 = recording              */
 344                                          /* Bit 1 = playback               */
 345                                          /* Bit 2 = playback, DLE-ETX seen */
 346   struct sk_buff_head   dtmf_queue;      /* queue for dtmf results         */
 347   void                  *adpcms;         /* state for adpcm decompression  */
 348   void                  *adpcmr;         /* state for adpcm compression    */
 349   void                  *dtmf_state;     /* state for dtmf decoder         */
 350   void                  *silence_state;  /* state for silence detection    */
 351 #endif
 352 #ifdef CONFIG_ISDN_TTY_FAX
 353   struct T30_s          *fax;            /* T30 Fax Group 3 data/interface */
 354   int                   faxonline;       /* Fax-channel status             */
 355 #endif
 356   atemu                 emu;             /* AT-emulator data               */
 357   spinlock_t            readlock;
 358 } modem_info;
 359
 360 #define ISDN_MODEM_WINSIZE 8
 361
 362 /* Description of one ISDN-tty */
 363 typedef struct _isdn_modem {
 364   int                refcount;                          /* Number of opens        */
 365   struct tty_driver  *tty_modem;                        /* tty-device             */
 366   struct tty_struct  *modem_table[ISDN_MAX_CHANNELS];   /* ?? copied from Orig    */
 367   struct ktermios     *modem_termios[ISDN_MAX_CHANNELS];
 368   struct ktermios     *modem_termios_locked[ISDN_MAX_CHANNELS];
 369   modem_info         info[ISDN_MAX_CHANNELS];      /* Private data           */
 370 } isdn_modem_t;
 371
 372 /*======================= End of ISDN-tty stuff ============================*/
 373
 374 /*======================== Start of V.110 stuff ============================*/
 375 #define V110_BUFSIZE 1024
 376
 377 typedef struct {
 378         int nbytes;                    /* 1 Matrixbyte -> nbytes in stream     */
 379         int nbits;                     /* Number of used bits in streambyte    */
 380         unsigned char key;             /* Bitmask in stream eg. 11 (nbits=2)   */
 381         int decodelen;                 /* Amount of data in decodebuf          */
 382         int SyncInit;                  /* Number of sync frames to send        */
 383         unsigned char *OnlineFrame;    /* Precalculated V110 idle frame        */
 384         unsigned char *OfflineFrame;   /* Precalculated V110 sync Frame        */
 385         int framelen;                  /* Length of frames                     */
 386         int skbuser;                   /* Number of unacked userdata skbs      */
 387         int skbidle;                   /* Number of unacked idle/sync skbs     */
 388         int introducer;                /* Local vars for decoder               */
 389         int dbit;
 390         unsigned char b;
 391         int skbres;                    /* space to reserve in outgoing skb     */
 392         int maxsize;                   /* maxbufsize of lowlevel driver        */
 393         unsigned char *encodebuf;      /* temporary buffer for encoding        */
 394         unsigned char decodebuf[V110_BUFSIZE]; /* incomplete V110 matrices     */
 395 } isdn_v110_stream;
 396
 397 /*========================= End of V.110 stuff =============================*/
 398
 399 /*======================= Start of general stuff ===========================*/
 400
 401 typedef struct {
 402         char *next;
 403         char *private;
 404 } infostruct;
 405
 406 #define DRV_FLAG_RUNNING 1
 407 #define DRV_FLAG_REJBUS  2
 408 #define DRV_FLAG_LOADED  4
 409
 410 /* Description of hardware-level-driver */
 411 typedef struct _isdn_driver {
 412         ulong               online;           /* Channel-Online flags             */
 413         ulong               flags;            /* Misc driver Flags                */
 414         int                 locks;            /* Number of locks for this driver  */
 415         int                 channels;         /* Number of channels               */
 416         wait_queue_head_t   st_waitq;         /* Wait-Queue for status-read's     */
 417         int                 maxbufsize;       /* Maximum Buffersize supported     */
 418         unsigned long       pktcount;         /* Until now: unused                */
 419         int                 stavail;          /* Chars avail on Status-device     */
 420         isdn_if            *interface;        /* Interface to driver              */
 421         int                *rcverr;           /* Error-counters for B-Ch.-receive */
 422         int                *rcvcount;         /* Byte-counters for B-Ch.-receive  */
 423 #ifdef CONFIG_ISDN_AUDIO
 424         unsigned long      DLEflag;           /* Flags: Insert DLE at next read   */
 425 #endif
 426         struct sk_buff_head *rpqueue;         /* Pointers to start of Rcv-Queue   */
 427         wait_queue_head_t  *rcv_waitq;       /* Wait-Queues for B-Channel-Reads  */
 428         wait_queue_head_t  *snd_waitq;       /* Wait-Queue for B-Channel-Send's  */
 429         char               msn2eaz[10][ISDN_MSNLEN];  /* Mapping-Table MSN->EAZ   */
 430 } isdn_driver_t;
 431
 432 /* Main driver-data */
 433 typedef struct isdn_devt {
 434         struct module     *owner;
 435         spinlock_t        lock;
 436         unsigned short    flags;                      /* Bitmapped Flags:           */
 437         int               drivers;                    /* Current number of drivers  */
 438         int               channels;                   /* Current number of channels */
 439         int               net_verbose;                /* Verbose-Flag               */
 440         int               modempoll;                  /* Flag: tty-read active      */
 441         spinlock_t        timerlock;
 442         int               tflags;                     /* Timer-Flags:               */
 443         /*  see ISDN_TIMER_..defines  */
 444         int               global_flags;
 445         infostruct        *infochain;                 /* List of open info-devs.    */
 446         wait_queue_head_t info_waitq;                 /* Wait-Queue for isdninfo    */
 447         struct timer_list timer;                      /* Misc.-function Timer       */
 448         int               chanmap[ISDN_MAX_CHANNELS]; /* Map minor->device-channel  */
 449         int               drvmap[ISDN_MAX_CHANNELS];  /* Map minor->driver-index    */
 450         int               usage[ISDN_MAX_CHANNELS];   /* Used by tty/ip/voice       */
 451         char              num[ISDN_MAX_CHANNELS][ISDN_MSNLEN];
 452         /* Remote number of active ch.*/
 453         int               m_idx[ISDN_MAX_CHANNELS];   /* Index for mdm....          */
 454         isdn_driver_t     *drv[ISDN_MAX_DRIVERS];     /* Array of drivers           */
 455         isdn_net_dev      *netdev;                    /* Linked list of net-if's    */
 456         char              drvid[ISDN_MAX_DRIVERS][20];/* Driver-ID                 */
 457         struct task_struct *profd;                    /* For iprofd                 */
 458         isdn_modem_t      mdm;                        /* tty-driver-data            */
 459         isdn_net_dev      *rx_netdev[ISDN_MAX_CHANNELS]; /* rx netdev-pointers     */
 460         isdn_net_dev      *st_netdev[ISDN_MAX_CHANNELS]; /* stat netdev-pointers   */
 461         ulong             ibytes[ISDN_MAX_CHANNELS];  /* Statistics incoming bytes  */
 462         ulong             obytes[ISDN_MAX_CHANNELS];  /* Statistics outgoing bytes  */
 463         int               v110emu[ISDN_MAX_CHANNELS]; /* V.110 emulator-mode 0=none */
 464         atomic_t          v110use[ISDN_MAX_CHANNELS]; /* Usage-Semaphore for stream */
 465         isdn_v110_stream  *v110[ISDN_MAX_CHANNELS];   /* V.110 private data         */
 466         struct mutex      mtx;                        /* serialize list access*/
 467         unsigned long     global_features;
 468 } isdn_dev;
 469
 470 extern isdn_dev *dev;
 471
 472
 473 #endif /* __ISDN_H__ */