text: /* $Id: isdn.h,v 1.125.2.3 2004/02/10 01:07:14 keil Exp $
   *
   * Main header for the Linux ISDN subsystem (linklevel).
   *
   * Copyright 1994,95,96 by Fritz Elfert (fritz@isdn4linux.de)
   * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   * 
   * This software may be used and distributed according to the terms
   * of the GNU General Public License, incorporated herein by reference.
   *
   */
  
  #ifndef __ISDN_H__
  #define __ISDN_H__
  
  #include <linux/ioctl.h>
  
  #define ISDN_MAX_DRIVERS    32
  #define ISDN_MAX_CHANNELS   64
  
  /* New ioctl-codes */
  #define IIOCNETAIF  _IO('I',1)
  #define IIOCNETDIF  _IO('I',2)
  #define IIOCNETSCF  _IO('I',3)
  #define IIOCNETGCF  _IO('I',4)
  #define IIOCNETANM  _IO('I',5)
  #define IIOCNETDNM  _IO('I',6)
  #define IIOCNETGNM  _IO('I',7)
  #define IIOCGETSET  _IO('I',8) /* no longer supported */
  #define IIOCSETSET  _IO('I',9) /* no longer supported */
  #define IIOCSETVER  _IO('I',10)
  #define IIOCNETHUP  _IO('I',11)
  #define IIOCSETGST  _IO('I',12)
  #define IIOCSETBRJ  _IO('I',13)
  #define IIOCSIGPRF  _IO('I',14)
  #define IIOCGETPRF  _IO('I',15)
  #define IIOCSETPRF  _IO('I',16)
  #define IIOCGETMAP  _IO('I',17)
  #define IIOCSETMAP  _IO('I',18)
  #define IIOCNETASL  _IO('I',19)
  #define IIOCNETDIL  _IO('I',20)
  #define IIOCGETCPS  _IO('I',21)
  #define IIOCGETDVR  _IO('I',22)
  #define IIOCNETLCR  _IO('I',23) /* dwabc ioctl for LCR from isdnlog */
  #define IIOCNETDWRSET  _IO('I',24) /* dwabc ioctl to reset abc-values to default on a net-interface */
  
  #define IIOCNETALN  _IO('I',32)
  #define IIOCNETDLN  _IO('I',33)
  
  #define IIOCNETGPN  _IO('I',34)
  
  #define IIOCDBGVAR  _IO('I',127)
  
  #define IIOCDRVCTL  _IO('I',128)
  
  /* cisco hdlck device private ioctls */
  #define SIOCGKEEPPERIOD	(SIOCDEVPRIVATE + 0)
  #define SIOCSKEEPPERIOD	(SIOCDEVPRIVATE + 1)
  #define SIOCGDEBSERINT	(SIOCDEVPRIVATE + 2)
  #define SIOCSDEBSERINT	(SIOCDEVPRIVATE + 3)
  
  /* Packet encapsulations for net-interfaces */
  #define ISDN_NET_ENCAP_ETHER      0
  #define ISDN_NET_ENCAP_RAWIP      1
  #define ISDN_NET_ENCAP_IPTYP      2
  #define ISDN_NET_ENCAP_CISCOHDLC  3 /* Without SLARP and keepalive */
  #define ISDN_NET_ENCAP_SYNCPPP    4
  #define ISDN_NET_ENCAP_UIHDLC     5
  #define ISDN_NET_ENCAP_CISCOHDLCK 6 /* With SLARP and keepalive    */
  #define ISDN_NET_ENCAP_X25IFACE   7 /* Documentation/networking/x25-iface.txt*/
  #define ISDN_NET_ENCAP_MAX_ENCAP  ISDN_NET_ENCAP_X25IFACE
  
  /* Facility which currently uses an ISDN-channel */
  #define ISDN_USAGE_NONE       0
  #define ISDN_USAGE_RAW        1
  #define ISDN_USAGE_MODEM      2
  #define ISDN_USAGE_NET        3
  #define ISDN_USAGE_VOICE      4
  #define ISDN_USAGE_FAX        5
  #define ISDN_USAGE_MASK       7 /* Mask to get plain usage */
  #define ISDN_USAGE_DISABLED  32 /* This bit is set, if channel is disabled */
  #define ISDN_USAGE_EXCLUSIVE 64 /* This bit is set, if channel is exclusive */
  #define ISDN_USAGE_OUTGOING 128 /* This bit is set, if channel is outgoing  */
  
  #define ISDN_MODEM_NUMREG    24        /* Number of Modem-Registers        */
  #define ISDN_LMSNLEN         255 /* Length of tty's Listen-MSN string */
  #define ISDN_CMSGLEN	     50	 /* Length of CONNECT-Message to add for Modem */
  
  #define ISDN_MSNLEN          32
  #define NET_DV 0x06  /* Data version for isdn_net_ioctl_cfg   */
  #define TTY_DV 0x06  /* Data version for iprofd etc.          */
  
  #define INF_DV 0x01  /* Data version for /dev/isdninfo        */
  
  typedef struct {
    char drvid[25];
    unsigned long arg;
  } isdn_ioctl_struct;
  
  typedef struct {
    char name[10];
    char phone[ISDN_MSNLEN];
    int  outgoing;
  } isdn_net_ioctl_phone;
  
  typedef struct {
    char name[10];     /* Name of interface                     */
    char master[10];   /* Name of Master for Bundling           */
    char slave[10];    /* Name of Slave for Bundling            */
    char eaz[256];     /* EAZ/MSN                               */
    char drvid[25];    /* DriverId for Bindings                 */
    int  onhtime;      /* Hangup-Timeout                        */
    int  charge;       /* Charge-Units                          */
    int  l2_proto;     /* Layer-2 protocol                      */
    int  l3_proto;     /* Layer-3 protocol                      */
    int  p_encap;      /* Encapsulation                         */
    int  exclusive;    /* Channel, if bound exclusive           */
    int  dialmax;      /* Dial Retry-Counter                    */
    int  slavedelay;   /* Delay until slave starts up           */
    int  cbdelay;      /* Delay before Callback                 */
    int  chargehup;    /* Flag: Charge-Hangup                   */
    int  ihup;         /* Flag: Hangup-Timeout on incoming line */
    int  secure;       /* Flag: Secure                          */
    int  callback;     /* Flag: Callback                        */
    int  cbhup;        /* Flag: Reject Call before Callback     */
    int  pppbind;      /* ippp device for bindings              */
    int  chargeint;    /* Use fixed charge interval length      */
    int  triggercps;   /* BogoCPS needed for triggering slave   */
    int  dialtimeout;  /* Dial-Timeout                          */
    int  dialwait;     /* Time to wait after failed dial        */
    int  dialmode;     /* Flag: off / on / auto                 */
  } isdn_net_ioctl_cfg;
  
  #define ISDN_NET_DIALMODE_MASK  0xC0    /* bits for status                */
  #define ISDN_NET_DM_OFF	        0x00    /* this interface is stopped      */
  #define ISDN_NET_DM_MANUAL	0x40    /* this interface is on (manual)  */
  #define ISDN_NET_DM_AUTO	0x80    /* this interface is autodial     */
  #define ISDN_NET_DIALMODE(x) ((&(x))->flags & ISDN_NET_DIALMODE_MASK)
  
  #ifdef __KERNEL__
  
  #include <linux/errno.h>
  #include <linux/fs.h>
  #include <linux/major.h>
  #include <asm/io.h>
  #include <linux/kernel.h>
  #include <linux/signal.h>
  #include <linux/slab.h>
  #include <linux/timer.h>
  #include <linux/wait.h>
  #include <linux/tty.h>
  #include <linux/tty_flip.h>
  #include <linux/serial_reg.h>
  #include <linux/fcntl.h>
  #include <linux/types.h>
  #include <linux/interrupt.h>
  #include <linux/ip.h>
  #include <linux/in.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/tcp.h>
  #include <linux/mutex.h>
  
  #define ISDN_TTY_MAJOR    43
  #define ISDN_TTYAUX_MAJOR 44
  #define ISDN_MAJOR        45
  
  /* The minor-devicenumbers for Channel 0 and 1 are used as arguments for
   * physical Channel-Mapping, so they MUST NOT be changed without changing
   * the correspondent code in isdn.c
   */
  
  #define ISDN_MINOR_B        0
  #define ISDN_MINOR_BMAX     (ISDN_MAX_CHANNELS-1)
  #define ISDN_MINOR_CTRL     64
  #define ISDN_MINOR_CTRLMAX  (64 + (ISDN_MAX_CHANNELS-1))
  #define ISDN_MINOR_PPP      128
  #define ISDN_MINOR_PPPMAX   (128 + (ISDN_MAX_CHANNELS-1))
  #define ISDN_MINOR_STATUS   255
  
  #ifdef CONFIG_ISDN_PPP
  
  #ifdef CONFIG_ISDN_PPP_VJ
  #  include <net/slhc_vj.h>
  #endif
  
  #include <linux/ppp_defs.h>
  #include <linux/if_ppp.h>
  
  #include <linux/isdn_ppp.h>
  #endif
  
  #ifdef CONFIG_ISDN_X25
  #  include <linux/concap.h>
  #endif
  
  #include <linux/isdnif.h>
  
  #define ISDN_DRVIOCTL_MASK       0x7f  /* Mask for Device-ioctl */
  
  /* Until now unused */
  #define ISDN_SERVICE_VOICE 1
  #define ISDN_SERVICE_AB    1<<1 
  #define ISDN_SERVICE_X21   1<<2
  #define ISDN_SERVICE_G4    1<<3
  #define ISDN_SERVICE_BTX   1<<4
  #define ISDN_SERVICE_DFUE  1<<5
  #define ISDN_SERVICE_X25   1<<6
  #define ISDN_SERVICE_TTX   1<<7
  #define ISDN_SERVICE_MIXED 1<<8
  #define ISDN_SERVICE_FW    1<<9
  #define ISDN_SERVICE_GTEL  1<<10
  #define ISDN_SERVICE_BTXN  1<<11
  #define ISDN_SERVICE_BTEL  1<<12
  
  /* Macros checking plain usage */
  #define USG_NONE(x)         ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NONE)
  #define USG_RAW(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_RAW)
  #define USG_MODEM(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM)
  #define USG_VOICE(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)
  #define USG_NET(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NET)
  #define USG_FAX(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_FAX)
  #define USG_OUTGOING(x)     ((x & ISDN_USAGE_OUTGOING)==ISDN_USAGE_OUTGOING)
  #define USG_MODEMORVOICE(x) (((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM) || \
                               ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)     )
  
  /* Timer-delays and scheduling-flags */
  #define ISDN_TIMER_RES         4                         /* Main Timer-Resolution   */
  #define ISDN_TIMER_02SEC       (HZ/ISDN_TIMER_RES/5)     /* Slow-Timer1 .2 sec      */
  #define ISDN_TIMER_1SEC        (HZ/ISDN_TIMER_RES)       /* Slow-Timer2 1 sec       */
  #define ISDN_TIMER_RINGING     5 /* tty RINGs = ISDN_TIMER_1SEC * this factor       */
  #define ISDN_TIMER_KEEPINT    10 /* Cisco-Keepalive = ISDN_TIMER_1SEC * this factor */
  #define ISDN_TIMER_MODEMREAD   1
  #define ISDN_TIMER_MODEMPLUS   2
  #define ISDN_TIMER_MODEMRING   4
  #define ISDN_TIMER_MODEMXMIT   8
  #define ISDN_TIMER_NETDIAL    16 
  #define ISDN_TIMER_NETHANGUP  32
  #define ISDN_TIMER_CARRIER   256 /* Wait for Carrier */
  #define ISDN_TIMER_FAST      (ISDN_TIMER_MODEMREAD | ISDN_TIMER_MODEMPLUS | \
                                ISDN_TIMER_MODEMXMIT)
  #define ISDN_TIMER_SLOW      (ISDN_TIMER_MODEMRING | ISDN_TIMER_NETHANGUP | \
                                ISDN_TIMER_NETDIAL | ISDN_TIMER_CARRIER)
  
  /* Timeout-Values for isdn_net_dial() */
  #define ISDN_TIMER_DTIMEOUT10 (10*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
  #define ISDN_TIMER_DTIMEOUT15 (15*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
  #define ISDN_TIMER_DTIMEOUT60 (60*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))
  
  /* GLOBAL_FLAGS */
  #define ISDN_GLOBAL_STOPPED 1
  
  /*=================== Start of ip-over-ISDN stuff =========================*/
  
  /* Feature- and status-flags for a net-interface */
  #define ISDN_NET_CONNECTED  0x01       /* Bound to ISDN-Channel             */
  #define ISDN_NET_SECURE     0x02       /* Accept calls from phonelist only  */
  #define ISDN_NET_CALLBACK   0x04       /* activate callback                 */
  #define ISDN_NET_CBHUP      0x08       /* hangup before callback            */
  #define ISDN_NET_CBOUT      0x10       /* remote machine does callback      */
  
  #define ISDN_NET_MAGIC      0x49344C02 /* for paranoia-checking             */
  
  /* Phone-list-element */
  typedef struct {
    void *next;
    char num[ISDN_MSNLEN];
  } isdn_net_phone;
  
  /*
     Principles when extending structures for generic encapsulation protocol
     ("concap") support:
     - Stuff which is hardware specific (here i4l-specific) goes in 
       the netdev -> local structure (here: isdn_net_local)
     - Stuff which is encapsulation protocol specific goes in the structure
       which holds the linux device structure (here: isdn_net_device)
  */
  
  /* Local interface-data */
  typedef struct isdn_net_local_s {
    ulong                  magic;
    struct net_device_stats stats;       /* Ethernet Statistics              */
    int                    isdn_device;  /* Index to isdn-device             */
    int                    isdn_channel; /* Index to isdn-channel            */
    int			 ppp_slot;     /* PPPD device slot number          */
    int                    pre_device;   /* Preselected isdn-device          */
    int                    pre_channel;  /* Preselected isdn-channel         */
    int                    exclusive;    /* If non-zero idx to reserved chan.*/
    int                    flags;        /* Connection-flags                 */
    int                    dialretry;    /* Counter for Dialout-retries      */
    int                    dialmax;      /* Max. Number of Dial-retries      */
    int                    cbdelay;      /* Delay before Callback starts     */
    int                    dtimer;       /* Timeout-counter for dialing      */
    char                   msn[ISDN_MSNLEN]; /* MSNs/EAZs for this interface */
    u_char                 cbhup;        /* Flag: Reject Call before Callback*/
    u_char                 dialstate;    /* State for dialing                */
    u_char                 p_encap;      /* Packet encapsulation             */
                                         /*   0 = Ethernet over ISDN         */
  				       /*   1 = RAW-IP                     */
                                         /*   2 = IP with type field         */
    u_char                 l2_proto;     /* Layer-2-protocol                 */
  				       /* See ISDN_PROTO_L2..-constants in */
                                         /* isdnif.h                         */
                                         /*   0 = X75/LAPB with I-Frames     */
  				       /*   1 = X75/LAPB with UI-Frames    */
  				       /*   2 = X75/LAPB with BUI-Frames   */
  				       /*   3 = HDLC                       */
    u_char                 l3_proto;     /* Layer-3-protocol                 */
  				       /* See ISDN_PROTO_L3..-constants in */
                                         /* isdnif.h                         */
                                         /*   0 = Transparent                */
    int                    huptimer;     /* Timeout-counter for auto-hangup  */
    int                    charge;       /* Counter for charging units       */
    ulong                  chargetime;   /* Timer for Charging info          */
    int                    hupflags;     /* Flags for charge-unit-hangup:    */
  				       /* bit0: chargeint is invalid       */
  				       /* bit1: Getting charge-interval    */
                                         /* bit2: Do charge-unit-hangup      */
                                         /* bit3: Do hangup even on incoming */
    int                    outgoing;     /* Flag: outgoing call              */
    int                    onhtime;      /* Time to keep link up             */
    int                    chargeint;    /* Interval between charge-infos    */
    int                    onum;         /* Flag: at least 1 outgoing number */
    int                    cps;          /* current speed of this interface  */
    int                    transcount;   /* byte-counter for cps-calculation */
    int                    sqfull;       /* Flag: netdev-queue overloaded    */
    ulong                  sqfull_stamp; /* Start-Time of overload           */
    ulong                  slavedelay;   /* Dynamic bundling delaytime       */
    int                    triggercps;   /* BogoCPS needed for trigger slave */
    isdn_net_phone         *phone[2];    /* List of remote-phonenumbers      */
  				       /* phone[0] = Incoming Numbers      */
  				       /* phone[1] = Outgoing Numbers      */
    isdn_net_phone         *dial;        /* Pointer to dialed number         */
    struct net_device      *master;      /* Ptr to Master device for slaves  */
    struct net_device      *slave;       /* Ptr to Slave device for masters  */
    struct isdn_net_local_s *next;       /* Ptr to next link in bundle       */
    struct isdn_net_local_s *last;       /* Ptr to last link in bundle       */
    struct isdn_net_dev_s  *netdev;      /* Ptr to netdev                    */
    struct sk_buff_head    super_tx_queue; /* List of supervisory frames to  */
  	                               /* be transmitted asap              */
    atomic_t frame_cnt;                  /* number of frames currently       */
                          	       /* queued in HL driver              */    
                                         /* Ptr to orig. hard_header_cache   */
    spinlock_t             xmit_lock;    /* used to protect the xmit path of */
                                         /* a particular channel (including  */
                                         /* the frame_cnt                    */
  
    int  pppbind;                        /* ippp device for bindings         */
    int					dialtimeout;	/* How long shall we try on dialing? (jiffies) */
    int					dialwait;		/* How long shall we wait after failed attempt? (jiffies) */
    ulong					dialstarted;	/* jiffies of first dialing-attempt */
    ulong					dialwait_timer;	/* jiffies of earliest next dialing-attempt */
    int					huptimeout;		/* How long will the connection be up? (seconds) */
  #ifdef CONFIG_ISDN_X25
    struct concap_device_ops *dops;      /* callbacks used by encapsulator   */
  #endif
    /* use an own struct for that in later versions */
    ulong cisco_myseq;                   /* Local keepalive seq. for Cisco   */
    ulong cisco_mineseen;                /* returned keepalive seq. from remote */
    ulong cisco_yourseq;                 /* Remote keepalive seq. for Cisco  */
    int cisco_keepalive_period;		/* keepalive period */
    ulong cisco_last_slarp_in;		/* jiffie of last keepalive packet we received */
    char cisco_line_state;		/* state of line according to keepalive packets */
    char cisco_debserint;			/* debugging flag of cisco hdlc with slarp */
    struct timer_list cisco_timer;
    struct work_struct tqueue;
  } isdn_net_local;
  
  /* the interface itself */
  typedef struct isdn_net_dev_s {
    isdn_net_local *local;
    isdn_net_local *queue;               /* circular list of all bundled
  					  channels, which are currently
  					  online                           */
    spinlock_t queue_lock;               /* lock to protect queue            */
    void *next;                          /* Pointer to next isdn-interface   */
    struct net_device *dev;              /* interface to upper levels        */
  #ifdef CONFIG_ISDN_PPP
    ippp_bundle * pb;		/* pointer to the common bundle structure
     			         * with the per-bundle data */
  #endif
  #ifdef CONFIG_ISDN_X25
    struct concap_proto  *cprot; /* connection oriented encapsulation protocol */
  #endif
  
  } isdn_net_dev;
  
  /*===================== End of ip-over-ISDN stuff ===========================*/
  
  /*======================= Start of ISDN-tty stuff ===========================*/
  
  #define ISDN_ASYNC_MAGIC          0x49344C01 /* for paranoia-checking        */
  #define ISDN_ASYNC_INITIALIZED	  0x80000000 /* port was initialized         */
  #define ISDN_ASYNC_CALLOUT_ACTIVE 0x40000000 /* Call out device active       */
  #define ISDN_ASYNC_NORMAL_ACTIVE  0x20000000 /* Normal device active         */
  #define ISDN_ASYNC_CLOSING	  0x08000000 /* Serial port is closing       */
  #define ISDN_ASYNC_CTS_FLOW	  0x04000000 /* Do CTS flow control          */
  #define ISDN_ASYNC_CHECK_CD	  0x02000000 /* i.e., CLOCAL                 */
  #define ISDN_ASYNC_HUP_NOTIFY         0x0001 /* Notify tty on hangups/closes */
  #define ISDN_ASYNC_SESSION_LOCKOUT    0x0100 /* Lock cua opens on session    */
  #define ISDN_ASYNC_PGRP_LOCKOUT       0x0200 /* Lock cua opens on pgrp       */
  #define ISDN_ASYNC_CALLOUT_NOHUP      0x0400 /* No hangup for cui            */
  #define ISDN_ASYNC_SPLIT_TERMIOS      0x0008 /* Sep. termios for dialin/out  */
  #define ISDN_SERIAL_XMIT_SIZE           1024 /* Default bufsize for write    */
  #define ISDN_SERIAL_XMIT_MAX            4000 /* Maximum bufsize for write    */
  #define ISDN_SERIAL_TYPE_NORMAL            1
  #define ISDN_SERIAL_TYPE_CALLOUT           2
  
  #ifdef CONFIG_ISDN_AUDIO
  /* For using sk_buffs with audio we need some private variables
   * within each sk_buff. For this purpose, we declare a struct here,
   * and put it always at the private skb->cb data array. A few macros help
   * accessing the variables.
   */
  typedef struct _isdn_audio_data {
    unsigned short dle_count;
    unsigned char  lock;
  } isdn_audio_data_t;
  
  #define ISDN_AUDIO_SKB_DLECOUNT(skb)	(((isdn_audio_data_t *)&skb->cb[0])->dle_count)
  #define ISDN_AUDIO_SKB_LOCK(skb)	(((isdn_audio_data_t *)&skb->cb[0])->lock)
  #endif
  
  /* Private data of AT-command-interpreter */
  typedef struct atemu {
  	u_char       profile[ISDN_MODEM_NUMREG]; /* Modem-Regs. Profile 0              */
  	u_char       mdmreg[ISDN_MODEM_NUMREG];  /* Modem-Registers                    */
  	char         pmsn[ISDN_MSNLEN];          /* EAZ/MSNs Profile 0                 */
  	char         msn[ISDN_MSNLEN];           /* EAZ/MSN                            */
  	char         plmsn[ISDN_LMSNLEN];        /* Listening MSNs Profile 0           */
  	char         lmsn[ISDN_LMSNLEN];         /* Listening MSNs                     */
  	char         cpn[ISDN_MSNLEN];           /* CalledPartyNumber on incoming call */
  	char         connmsg[ISDN_CMSGLEN];	 /* CONNECT-Msg from HL-Driver	       */
  #ifdef CONFIG_ISDN_AUDIO
  	u_char       vpar[10];                   /* Voice-parameters                   */
  	int          lastDLE;                    /* Flag for voice-coding: DLE seen    */
  #endif
  	int          mdmcmdl;                    /* Length of Modem-Commandbuffer      */
  	int          pluscount;                  /* Counter for +++ sequence           */
  	u_long       lastplus;                   /* Timestamp of last +                */
  	int	     carrierwait;                /* Seconds of carrier waiting         */
  	char         mdmcmd[255];                /* Modem-Commandbuffer                */
  	unsigned int charge;                     /* Charge units of current connection */
  } atemu;
  
  /* Private data (similar to async_struct in <linux/serial.h>) */
  typedef struct modem_info {
    int			magic;
    struct module		*owner;
    int			flags;		 /* defined in tty.h               */
    int			x_char;		 /* xon/xoff character             */
    int			mcr;		 /* Modem control register         */
    int                   msr;             /* Modem status register          */
    int                   lsr;             /* Line status register           */
    int			line;
    int			count;		 /* # of fd on device              */
    int			blocked_open;	 /* # of blocked opens             */
    long			session;	 /* Session of opening process     */
    long			pgrp;		 /* pgrp of opening process        */
    int                   online;          /* 1 = B-Channel is up, drop data */
  					 /* 2 = B-Channel is up, deliver d.*/
    int                   dialing;         /* Dial in progress or ATA        */
    int                   rcvsched;        /* Receive needs schedule         */
    int                   isdn_driver;	 /* Index to isdn-driver           */
    int                   isdn_channel;    /* Index to isdn-channel          */
    int                   drv_index;       /* Index to dev->usage            */
    int                   ncarrier;        /* Flag: schedule NO CARRIER      */
    unsigned char         last_cause[8];   /* Last cause message             */
    unsigned char         last_num[ISDN_MSNLEN];
  	                                 /* Last phone-number              */
    unsigned char         last_l2;         /* Last layer-2 protocol          */
    unsigned char         last_si;         /* Last service                   */
    unsigned char         last_lhup;       /* Last hangup local?             */
    unsigned char         last_dir;        /* Last direction (in or out)     */
    struct timer_list     nc_timer;        /* Timer for delayed NO CARRIER   */
    int                   send_outstanding;/* # of outstanding send-requests */
    int                   xmit_size;       /* max. # of chars in xmit_buf    */
    int                   xmit_count;      /* # of chars in xmit_buf         */
    unsigned char         *xmit_buf;       /* transmit buffer                */
    struct sk_buff_head   xmit_queue;      /* transmit queue                 */
    atomic_t              xmit_lock;       /* Semaphore for isdn_tty_write   */
  #ifdef CONFIG_ISDN_AUDIO
    int                   vonline;         /* Voice-channel status           */
  					 /* Bit 0 = recording              */
  					 /* Bit 1 = playback               */
  					 /* Bit 2 = playback, DLE-ETX seen */
    struct sk_buff_head   dtmf_queue;      /* queue for dtmf results         */
    void                  *adpcms;         /* state for adpcm decompression  */
    void                  *adpcmr;         /* state for adpcm compression    */
    void                  *dtmf_state;     /* state for dtmf decoder         */
    void                  *silence_state;  /* state for silence detection    */
  #endif
  #ifdef CONFIG_ISDN_TTY_FAX
    struct T30_s		*fax;		 /* T30 Fax Group 3 data/interface */
    int			faxonline;	 /* Fax-channel status             */
  #endif
    struct tty_struct 	*tty;            /* Pointer to corresponding tty   */
    atemu                 emu;             /* AT-emulator data               */
    struct ktermios	normal_termios;  /* For saving termios structs     */
    struct ktermios	callout_termios;
    wait_queue_head_t	open_wait, close_wait;
    spinlock_t	        readlock;
  } modem_info;
  
  #define ISDN_MODEM_WINSIZE 8
  
  /* Description of one ISDN-tty */
  typedef struct _isdn_modem {
    int                refcount;				/* Number of opens        */
    struct tty_driver  *tty_modem;			/* tty-device             */
    struct tty_struct  *modem_table[ISDN_MAX_CHANNELS];	/* ?? copied from Orig    */
    struct ktermios     *modem_termios[ISDN_MAX_CHANNELS];
    struct ktermios     *modem_termios_locked[ISDN_MAX_CHANNELS];
    modem_info         info[ISDN_MAX_CHANNELS];	   /* Private data           */
  } isdn_modem_t;
  
  /*======================= End of ISDN-tty stuff ============================*/
  
  /*======================== Start of V.110 stuff ============================*/
  #define V110_BUFSIZE 1024
  
  typedef struct {
  	int nbytes;                    /* 1 Matrixbyte -> nbytes in stream     */
  	int nbits;                     /* Number of used bits in streambyte    */
  	unsigned char key;             /* Bitmask in stream eg. 11 (nbits=2)   */
  	int decodelen;                 /* Amount of data in decodebuf          */
  	int SyncInit;                  /* Number of sync frames to send        */
  	unsigned char *OnlineFrame;    /* Precalculated V110 idle frame        */
  	unsigned char *OfflineFrame;   /* Precalculated V110 sync Frame        */
  	int framelen;                  /* Length of frames                     */
  	int skbuser;                   /* Number of unacked userdata skbs      */
  	int skbidle;                   /* Number of unacked idle/sync skbs     */
  	int introducer;                /* Local vars for decoder               */
  	int dbit;
  	unsigned char b;
  	int skbres;                    /* space to reserve in outgoing skb     */
  	int maxsize;                   /* maxbufsize of lowlevel driver        */
  	unsigned char *encodebuf;      /* temporary buffer for encoding        */
  	unsigned char decodebuf[V110_BUFSIZE]; /* incomplete V110 matrices     */
  } isdn_v110_stream;
  
  /*========================= End of V.110 stuff =============================*/
  
  /*======================= Start of general stuff ===========================*/
  
  typedef struct {
  	char *next;
  	char *private;
  } infostruct;
  
  #define DRV_FLAG_RUNNING 1
  #define DRV_FLAG_REJBUS  2
  #define DRV_FLAG_LOADED  4
  
  /* Description of hardware-level-driver */
  typedef struct _isdn_driver {
  	ulong               online;           /* Channel-Online flags             */
  	ulong               flags;            /* Misc driver Flags                */
  	int                 locks;            /* Number of locks for this driver  */
  	int                 channels;         /* Number of channels               */
  	wait_queue_head_t   st_waitq;         /* Wait-Queue for status-read's     */
  	int                 maxbufsize;       /* Maximum Buffersize supported     */
  	unsigned long       pktcount;         /* Until now: unused                */
  	int                 stavail;          /* Chars avail on Status-device     */
  	isdn_if            *interface;        /* Interface to driver              */
  	int                *rcverr;           /* Error-counters for B-Ch.-receive */
  	int                *rcvcount;         /* Byte-counters for B-Ch.-receive  */
  #ifdef CONFIG_ISDN_AUDIO
  	unsigned long      DLEflag;           /* Flags: Insert DLE at next read   */
  #endif
  	struct sk_buff_head *rpqueue;         /* Pointers to start of Rcv-Queue   */
  	wait_queue_head_t  *rcv_waitq;       /* Wait-Queues for B-Channel-Reads  */
  	wait_queue_head_t  *snd_waitq;       /* Wait-Queue for B-Channel-Send's  */
  	char               msn2eaz[10][ISDN_MSNLEN];  /* Mapping-Table MSN->EAZ   */
  } isdn_driver_t;
  
  /* Main driver-data */
  typedef struct isdn_devt {
  	struct module     *owner;
  	spinlock_t	  lock;
  	unsigned short    flags;		      /* Bitmapped Flags:           */
  	int               drivers;		      /* Current number of drivers  */
  	int               channels;		      /* Current number of channels */
  	int               net_verbose;                /* Verbose-Flag               */
  	int               modempoll;		      /* Flag: tty-read active      */
  	spinlock_t	  timerlock;
  	int               tflags;                     /* Timer-Flags:               */
  	/*  see ISDN_TIMER_..defines  */
  	int               global_flags;
  	infostruct        *infochain;                 /* List of open info-devs.    */
  	wait_queue_head_t info_waitq;                 /* Wait-Queue for isdninfo    */
  	struct timer_list timer;		      /* Misc.-function Timer       */
  	int               chanmap[ISDN_MAX_CHANNELS]; /* Map minor->device-channel  */
  	int               drvmap[ISDN_MAX_CHANNELS];  /* Map minor->driver-index    */
  	int               usage[ISDN_MAX_CHANNELS];   /* Used by tty/ip/voice       */
  	char              num[ISDN_MAX_CHANNELS][ISDN_MSNLEN];
  	/* Remote number of active ch.*/
  	int               m_idx[ISDN_MAX_CHANNELS];   /* Index for mdm....          */
  	isdn_driver_t     *drv[ISDN_MAX_DRIVERS];     /* Array of drivers           */
  	isdn_net_dev      *netdev;		      /* Linked list of net-if's    */
  	char              drvid[ISDN_MAX_DRIVERS][20];/* Driver-ID                 */
  	struct task_struct *profd;                    /* For iprofd                 */
  	isdn_modem_t      mdm;			      /* tty-driver-data            */
  	isdn_net_dev      *rx_netdev[ISDN_MAX_CHANNELS]; /* rx netdev-pointers     */
  	isdn_net_dev      *st_netdev[ISDN_MAX_CHANNELS]; /* stat netdev-pointers   */
  	ulong             ibytes[ISDN_MAX_CHANNELS];  /* Statistics incoming bytes  */
  	ulong             obytes[ISDN_MAX_CHANNELS];  /* Statistics outgoing bytes  */
  	int               v110emu[ISDN_MAX_CHANNELS]; /* V.110 emulator-mode 0=none */
  	atomic_t          v110use[ISDN_MAX_CHANNELS]; /* Usage-Semaphore for stream */
  	isdn_v110_stream  *v110[ISDN_MAX_CHANNELS];   /* V.110 private data         */
  	struct mutex      mtx;                        /* serialize list access*/
  	unsigned long     global_features;
  } isdn_dev;
  
  extern isdn_dev *dev;
  
  
  #endif /* __KERNEL__ */
  
  #endif /* __ISDN_H__ */
  