# isdn.h

    /* $Id$
     *
     * Main header for the Linux ISDN subsystem (linklevel).
     *
     * Copyright 1994,95,96 by Fritz Elfert (fritz@wuemaus.franken.de)
     * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
     * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation; either version 2, or (at your option)
     * any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     *
     * $Log$
     * Revision 1.55  1998/06/26 15:13:17  fritz
     * Added handling of STAT_ICALL with incomplete CPN.
     * Added AT&L for ttyI emulator.
     * Added more locking stuff in tty_write.
     *
     * Revision 1.54  1998/06/18 23:32:01  fritz
     * Replaced cli()/restore_flags() in isdn_tty_write() by locking.
     * Removed direct-senddown feature in isdn_tty_write because it will
     * never succeed with locking and is useless anyway.
     *
     * Revision 1.53  1998/06/17 19:51:51  he
     * merged with 2.1.10[34] (cosmetics and udelay() -> mdelay())
     * brute force fix to avoid Ugh's in isdn_tty_write()
     * cleaned up some dead code
     *
     * Revision 1.52  1998/06/12 11:42:18  detabc
     * cleanup abc
     *
     * Revision 1.51  1998/06/02 12:10:30  detabc
     * wegen einer einstweiliger verfuegung gegen DW ist zur zeit
     * die abc-extension bis zur klaerung der rechtslage nicht verfuegbar
     *
     * Revision 1.50  1998/05/05 23:11:51  detabc
     * add Item to stop icmp-unreach (max. 6 times of dialwait delay)
     *
     * Revision 1.49  1998/05/03 17:45:00  detabc
     * Add Item to send icmp-host-unreach to all packets
     *
     * Revision 1.48  1998/04/26 19:58:14  detabc
     * include the new abc-extension-items from 2.0.xx kernels
     * remove some unused code
     *
     * Revision 1.47  1998/04/21 18:00:25  detabc
     * Add items for secure-callback (abc-extension only)
     *
     * Revision 1.46  1998/04/14 16:28:59  he
     * Fixed user space access with interrupts off and remaining
     * copy_{to,from}_user() -> -EFAULT return codes
     *
     * Revision 1.45  1998/03/24 16:33:12  hipp
     * More CCP changes. BSD compression now "works" on a local loopback link.
     * Moved some isdn_ppp stuff from isdn.h to isdn_ppp.h
     *
     * Revision 1.44  1998/03/22 18:50:56  hipp
     * Added BSD Compression for syncPPP .. UNTESTED at the moment
     *
     * Revision 1.43  1998/03/09 17:46:44  he
     * merged in 2.1.89 changes
     *
     * Revision 1.42  1998/03/08 13:53:46  detabc
     * add ABC-variables in structur isdn_devt
     *
     * Revision 1.41  1998/03/08 13:14:37  detabc
     * abc-extension support for kernels > 2.1.x
     * first try (sorry experimental)
     *
     * Revision 1.40  1998/03/08 01:08:29  fritz
     * Increased NET_DV because of TIMRU
     *
     * Revision 1.39  1998/03/07 22:42:49  fritz
     * Starting generic module support (Nothing usable yet).
     *
     * Revision 1.38  1998/03/07 18:21:29  cal
     * Dynamic Timeout-Rule-Handling vs. 971110 included
     *
     * Revision 1.37  1998/02/22 19:45:24  fritz
     * Some changes regarding V.110
     *
     * Revision 1.36  1998/02/20 17:35:55  fritz
     * Added V.110 stuff.
     *
     * Revision 1.35  1998/01/31 22:14:14  keil
     * changes for 2.1.82
     *
     * Revision 1.34  1997/10/09 21:28:11  fritz
     * New HL<->LL interface:
     *   New BSENT callback with nr. of bytes included.
     *   Sending without ACK.
     *   New L1 error status (not yet in use).
     *   Cleaned up obsolete structures.
     * Implemented Cisco-SLARP.
     * Changed local net-interface data to be dynamically allocated.
     * Removed old 2.0 compatibility stuff.
     *
     * Revision 1.33  1997/08/21 14:44:22  fritz
     * Moved triggercps to end of struct for backwards-compatibility.
     *
     * Revision 1.32  1997/08/21 09:49:46  fritz
     * Increased NET_DV
     *
     * Revision 1.31  1997/06/22 11:57:07  fritz
     * Added ability to adjust slave triggerlevel.
     *
     * Revision 1.30  1997/06/17 13:07:23  hipp
     * compression changes , MP changes
     *
     * Revision 1.29  1997/05/27 15:18:02  fritz
     * Added changes for recent 2.1.x kernels:
     *   changed return type of isdn_close
     *   queue_task_* -> queue_task
     *   clear/set_bit -> test_and_... where apropriate.
     *   changed type of hard_header_cache parameter.
     *
     * Revision 1.28  1997/03/07 01:33:01  fritz
     * Added proper ifdef's for CONFIG_ISDN_AUDIO
     *
     * Revision 1.27  1997/03/05 21:11:49  fritz
     * Minor fixes.
     *
     * Revision 1.26  1997/02/28 02:37:53  fritz
     * Added some comments.
     *
     * Revision 1.25  1997/02/23 16:54:23  hipp
     * some initial changes for future PPP compresion
     *
     * Revision 1.24  1997/02/18 09:42:45  fritz
     * Bugfix: Increased ISDN_MODEM_ANZREG.
     * Increased TTY_DV.
     *
     * Revision 1.23  1997/02/10 22:07:13  fritz
     * Added 2 modem registers for numbering plan and screening info.
     *
     * Revision 1.22  1997/02/03 23:42:08  fritz
     * Added ISDN_TIMER_RINGING
     * Misc. changes for Kernel 2.1.X compatibility
     *
     * Revision 1.21  1997/01/17 01:19:10  fritz
     * Applied chargeint patch.
     *
     * Revision 1.20  1997/01/17 00:41:19  fritz
     * Increased TTY_DV.
     *
     * Revision 1.19  1997/01/14 01:41:07  fritz
     * Added ATI2 related variables.
     * Added variables for audio support in skbuffs.
     *
     * Revision 1.18  1996/11/06 17:37:50  keil
     * more changes for 2.1.X
     *
     * Revision 1.17  1996/09/07 12:53:57  hipp
     * moved a few isdn_ppp.c specific defines to drives/isdn/isdn_ppp.h
     *
     * Revision 1.16  1996/08/12 16:20:56  hipp
     * renamed ppp_minor to ppp_slot
     *
     * Revision 1.15  1996/06/15 14:56:57  fritz
     * Added version signatures for data structures used
     * by userlevel programs.
     *
     * Revision 1.14  1996/06/06 21:24:23  fritz
     * Started adding support for suspend/resume.
     *
     * Revision 1.13  1996/06/05 02:18:20  fritz
     * Added DTMF decoding stuff.
     *
     * Revision 1.12  1996/06/03 19:55:08  fritz
     * Fixed typos.
     *
     * Revision 1.11  1996/05/31 01:37:47  fritz
     * Minor changes, due to changes in isdn_tty.c
     *
     * Revision 1.10  1996/05/18 01:37:18  fritz
     * Added spelling corrections and some minor changes
     * to stay in sync with kernel.
     *
     * Revision 1.9  1996/05/17 03:58:20  fritz
     * Added flags for DLE handling.
     *
     * Revision 1.8  1996/05/11 21:49:55  fritz
     * Removed queue management variables.
     * Changed queue management to use sk_buffs.
     *
     * Revision 1.7  1996/05/07 09:10:06  fritz
     * Reorganized tty-related structs.
     *
     * Revision 1.6  1996/05/06 11:38:27  hipp
     * minor change in ippp struct
     *
     * Revision 1.5  1996/04/30 11:03:16  fritz
     * Added Michael's ippp-bind patch.
     *
     * Revision 1.4  1996/04/29 23:00:02  fritz
     * Added variables for voice-support.
     *
     * Revision 1.3  1996/04/20 16:54:58  fritz
     * Increased maximum number of channels.
     * Added some flags for isdn_net to handle callback more reliable.
     * Fixed delay-definitions to be more accurate.
     * Misc. typos
     *
     * Revision 1.2  1996/02/11 02:10:02  fritz
     * Changed IOCTL-names
     * Added rx_netdev, st_netdev, first_skb, org_hcb, and org_hcu to
     * Netdevice-local struct.
     *
     * Revision 1.1  1996/01/10 20:55:07  fritz
     * Initial revision
     *
     */

    #ifndef isdn_h
    #define isdn_h

    #include <linux/ioctl.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_MAX_DRIVERS    32
    #define ISDN_MAX_CHANNELS   64
    #define ISDN_MINOR_B        0
    #define ISDN_MINOR_BMAX     (ISDN_MAX_CHANNELS-1)
    #define ISDN_MINOR_CTRL     ISDN_MAX_CHANNELS
    #define ISDN_MINOR_CTRLMAX  (2*ISDN_MAX_CHANNELS-1)
    #define ISDN_MINOR_PPP      (2*ISDN_MAX_CHANNELS)
    #define ISDN_MINOR_PPPMAX   (3*ISDN_MAX_CHANNELS-1)
    #define ISDN_MINOR_STATUS   255

    /* 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)
    #define IIOCSETSET  _IO('I',9)
    #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 IIOCNETARU  _IO('I',23)
    #define IIOCNETDRU  _IO('I',24)
    #define IIOCNETGRU  _IO('I',25)

    #define IIOCNETBUD  _IO('I',26)

    #define IIOCNETALN  _IO('I',32)
    #define IIOCNETDLN  _IO('I',33)

    #define IIOCDBGVAR  _IO('I',127)

    #define IIOCDRVCTL  _IO('I',128)

    /* 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_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_ANZREG    23        /* Number of Modem-Registers        */
    #define ISDN_MSNLEN          20
    #define ISDN_LMSNLEN         255 /* Length of tty's Listen-MSN string */

    typedef struct {
      char drvid[25];
      unsigned long arg;
    } isdn_ioctl_struct;

    typedef struct {
      unsigned long isdndev;
      unsigned long atmodem[ISDN_MAX_CHANNELS];
      unsigned long info[ISDN_MAX_CHANNELS];
    } debugvar_addr;

    typedef struct {
      char name[10];
      char phone[ISDN_MSNLEN];
      int  outgoing;
    } isdn_net_ioctl_phone;

    #define NET_DV 0x05 /* Data version for net_cfg       */
    #define TTY_DV 0x05 /* Data version for iprofd etc.   */
    #define INF_DV 0x01 /* Data version for /dev/isdninfo */

    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  stopped;      /* Flag: Stopped                         */
    } isdn_net_ioctl_cfg;

    #ifdef __KERNEL__

    #ifndef STANDALONE
    #include <linux/config.h>
    #endif
    #include <linux/errno.h>
    #include <linux/fs.h>
    #include <linux/major.h>
    #include <asm/segment.h>
    #include <asm/io.h>
    #include <linux/kernel.h>
    #include <linux/signal.h>
    #include <linux/malloc.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>

    #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/if_pppvar.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_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         3                         /* Main Timer-Resolution   */
    #define ISDN_TIMER_02SEC       (HZ/(ISDN_TIMER_RES+1)/5) /* Slow-Timer1 .2 sec      */
    #define ISDN_TIMER_1SEC        (HZ/(ISDN_TIMER_RES+1))   /* 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_IPPP       64
    #define ISDN_TIMER_KEEPALIVE 128 /* Cisco-Keepalive */
    #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_KEEPALIVE)

    /* 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)))

    /* 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      */
    #if 0
    /* Unused??? */
    #define ISDN_NET_CLONE      0x08       /* clone a tmp interface when called */
    #define ISDN_NET_TMP        0x10       /* tmp interface until getting an IP */
    #define ISDN_NET_DYNAMIC    0x20       /* this link is dynamically allocated */
    #endif

    #define ISDN_NET_STOPPED    0x40       /* this interface is stopped         */

    #define ISDN_NET_MAGIC      0x49344C02 /* for paranoia-checking             */

    /* Phone-list-element */
    typedef struct {
      void *next;
      char num[ISDN_MSNLEN];
    } isdn_net_phone;

    #ifdef CONFIG_ISDN_TIMEOUT_RULES
    #include <linux/isdn_timru.h>

    struct isdn_timeout_rules {
    	isdn_timeout_rule	*timru[ISDN_TIMRU_NUM_CHECK][ISDN_TIMRU_NUM_PROTFAM];
    	int			defaults[ISDN_TIMRU_NUM_CHECK];
    };
    #endif

    #ifdef CONFIG_ISDN_BUDGET
    #include <linux/isdn_budget.h>

    typedef struct {
    	int		amount,			/* usable amount */
    			used,			/* used so far */
    			period,			/* length of period */
    			notified;		/* flag: notified user about low budget */
    	time_t	period_started,	/* when did the current period start? */
    			last_check;		/* last time checked */
    }	isdn_budget;
    #endif

    /*
       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;
      char                   name[10];     /* Name of device                   */
      struct enet_statistics 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       */
      int                    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 */
      struct device          *srobin;      /* Ptr to Master device for slaves  */
      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 device          *master;      /* Ptr to Master device for slaves  */
      struct 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         *first_skb;   /* Ptr to skb that triggers dialing */
      struct sk_buff         *sav_skb;     /* Ptr to skb, rejected by LL-driver*/
                                           /* Ptr to orig. hard_header_cache   */
      int                    (*org_hhc)(
    				    struct neighbour *neigh,
    				    struct hh_cache *hh);
                                           /* Ptr to orig. header_cache_update */
      void                   (*org_hcu)(struct hh_cache *,
    				    struct device *,
                                        unsigned char *);
      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_TIMEOUT_RULES
      struct isdn_timeout_rules	*timeout_rules;
    #endif
    #ifdef CONFIG_ISDN_BUDGET
      isdn_budget	budget [ISDN_BUDGET_NUM_BUDGET];
    #endif
    #ifdef CONFIG_ISDN_X25
      struct concap_device_ops *dops;      /* callbacks used by encapsulator   */
    #endif
      int  cisco_loop;                     /* Loop counter for Cisco-SLARP     */
      ulong cisco_myseq;                   /* Local keepalive seq. for Cisco   */
      ulong cisco_yourseq;                 /* Remote keepalive seq. for Cisco  */
    } isdn_net_local;

    /* the interface itself */
    typedef struct isdn_net_dev_s {
      isdn_net_local *local;
      isdn_net_local *queue;
      void           *next;                /* Pointer to next isdn-interface   */
      struct device   dev;	       /* interface to upper levels        */
    #ifdef CONFIG_ISDN_PPP
      struct mpqueue *mp_last;
      struct ippp_bundle ib;
    #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 skb->head. A few macros help accessing the
     * variables. Of course, we need to check skb_headroom prior to
     * any access.
     */
    typedef struct isdn_audio_skb {
      unsigned short dle_count;
      unsigned char  lock;
    } isdn_audio_skb;

    #define ISDN_AUDIO_SKB_DLECOUNT(skb) (((isdn_audio_skb*)skb->head)->dle_count)
    #define ISDN_AUDIO_SKB_LOCK(skb) (((isdn_audio_skb*)skb->head)->lock)
    #endif

    /* Private data of AT-command-interpreter */
    typedef struct atemu {
    	u_char       profile[ISDN_MODEM_ANZREG]; /* Modem-Regs. Profile 0              */
    	u_char       mdmreg[ISDN_MODEM_ANZREG];  /* 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 */
    #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           */
    	int          lastplus;                   /* Timestamp of last +                */
    	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;
      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               */
      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         */
    #endif
      struct tty_struct 	*tty;            /* Pointer to corresponding tty   */
      atemu                 emu;             /* AT-emulator data               */
      struct termios	normal_termios;  /* For saving termios structs     */
      struct termios	callout_termios;
      struct wait_queue	*open_wait;
      struct wait_queue	*close_wait;
      struct semaphore      write_sem;
    } modem_info;

    #define ISDN_MODEM_WINSIZE 8

    /* Description of one ISDN-tty */
    typedef struct {
      int                refcount;			   /* Number of opens        */
      struct tty_driver  tty_modem;			   /* tty-device             */
      struct tty_driver  cua_modem;			   /* cua-device             */
      struct tty_struct  *modem_table[ISDN_MAX_CHANNELS]; /* ?? copied from Orig */
      struct termios     *modem_termios[ISDN_MAX_CHANNELS];
      struct termios     *modem_termios_locked[ISDN_MAX_CHANNELS];
      modem_info         info[ISDN_MAX_CHANNELS];	   /* Private data           */
    } modem;

    /*======================= 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;

    typedef struct isdn_module {
    	struct isdn_module *prev;
    	struct isdn_module *next;
    	char *name;
    	int (*get_free_channel)(int, int, int, int, int);
    	int (*free_channel)(int, int, int);
    	int (*status_callback)(isdn_ctrl *);
    	int (*command)(isdn_ctrl *);
    	int (*receive_callback)(int, int, struct sk_buff *);
    	int (*writebuf_skb)(int, int, int, struct sk_buff *);
    	int (*net_start_xmit)(struct sk_buff *, struct device *);
    	int (*net_receive)(struct device *, struct sk_buff *);
    	int (*net_open)(struct device *);
    	int (*net_close)(struct device *);
    	int priority;
    } isdn_module;

    /* Description of hardware-level-driver */
    typedef struct {
    	ulong               flags;            /* Flags                            */
    	int                 channels;         /* Number of channels               */
    	int                 reject_bus;       /* Flag: Reject rejected call on bus*/
    	struct wait_queue  *st_waitq;         /* Wait-Queue for status-read's     */
    	int                 maxbufsize;       /* Maximum Buffersize supported     */
    	unsigned long       pktcount;         /* Until now: unused                */
    	int                 running;          /* Flag: Protocolcode running       */
    	int                 loaded;           /* Flag: Driver loaded              */
    	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   */
    	struct wait_queue  **rcv_waitq;       /* Wait-Queues for B-Channel-Reads  */
    	struct wait_queue  **snd_waitq;       /* Wait-Queue for B-Channel-Send's  */
    	char               msn2eaz[10][ISDN_MSNLEN];  /* Mapping-Table MSN->EAZ   */
    } driver;

    /* Main driver-data */
    typedef struct isdn_devt {
    	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      */
    	int               tflags;                    /* Timer-Flags:               */
    	/*  see ISDN_TIMER_..defines  */
    	int               global_flags;
    	infostruct        *infochain;                /* List of open info-devs.    */
    	struct wait_queue *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....          */
    	driver            *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                 */
    	modem             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 semaphore  sem;                       /* serialize list access*/
    	isdn_module       *modules;
    } isdn_dev;

    extern isdn_dev *dev;

    /* Utility-Macros */
    #define MIN(a,b) ((a<b)?a:b)
    #define MAX(a,b) ((a>b)?a:b)

    #if (LINUX_VERSION_CODE < 0x020159) /* 2.1.89 */
    #define poll_wait(f,wq,w) poll_wait((wq),(w))
    #endif
    #endif /* __KERNEL__ */
    #endif /* isdn_h */