linux/include/linux/isdnif.h
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   1/* $Id: isdnif.h,v 1.43.2.2 2004/01/12 23:08:35 keil Exp $
   2 *
   3 * Linux ISDN subsystem
   4 * Definition of the interface between the subsystem and its low-level drivers.
   5 *
   6 * Copyright 1994,95,96 by Fritz Elfert (fritz@isdn4linux.de)
   7 * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   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
  14#ifndef __ISDNIF_H__
  15#define __ISDNIF_H__
  16
  17
  18/*
  19 * Values for general protocol-selection
  20 */
  21#define ISDN_PTYPE_UNKNOWN   0   /* Protocol undefined   */
  22#define ISDN_PTYPE_1TR6      1   /* german 1TR6-protocol */
  23#define ISDN_PTYPE_EURO      2   /* EDSS1-protocol       */
  24#define ISDN_PTYPE_LEASED    3   /* for leased lines     */
  25#define ISDN_PTYPE_NI1       4   /* US NI-1 protocol     */
  26#define ISDN_PTYPE_MAX       7   /* Max. 8 Protocols     */
  27
  28/*
  29 * Values for Layer-2-protocol-selection
  30 */
  31#define ISDN_PROTO_L2_X75I   0   /* X75/LAPB with I-Frames            */
  32#define ISDN_PROTO_L2_X75UI  1   /* X75/LAPB with UI-Frames           */
  33#define ISDN_PROTO_L2_X75BUI 2   /* X75/LAPB with UI-Frames           */
  34#define ISDN_PROTO_L2_HDLC   3   /* HDLC                              */
  35#define ISDN_PROTO_L2_TRANS  4   /* Transparent (Voice)               */
  36#define ISDN_PROTO_L2_X25DTE 5   /* X25/LAPB DTE mode                 */
  37#define ISDN_PROTO_L2_X25DCE 6   /* X25/LAPB DCE mode                 */
  38#define ISDN_PROTO_L2_V11096 7   /* V.110 bitrate adaption 9600 Baud  */
  39#define ISDN_PROTO_L2_V11019 8   /* V.110 bitrate adaption 19200 Baud */
  40#define ISDN_PROTO_L2_V11038 9   /* V.110 bitrate adaption 38400 Baud */
  41#define ISDN_PROTO_L2_MODEM  10  /* Analog Modem on Board */
  42#define ISDN_PROTO_L2_FAX    11  /* Fax Group 2/3         */
  43#define ISDN_PROTO_L2_HDLC_56K 12   /* HDLC 56k                          */
  44#define ISDN_PROTO_L2_MAX    15  /* Max. 16 Protocols                 */
  45
  46/*
  47 * Values for Layer-3-protocol-selection
  48 */
  49#define ISDN_PROTO_L3_TRANS     0       /* Transparent */
  50#define ISDN_PROTO_L3_TRANSDSP  1       /* Transparent with DSP */
  51#define ISDN_PROTO_L3_FCLASS2   2       /* Fax Group 2/3 CLASS 2 */
  52#define ISDN_PROTO_L3_FCLASS1   3       /* Fax Group 2/3 CLASS 1 */
  53#define ISDN_PROTO_L3_MAX       7       /* Max. 8 Protocols */
  54
  55#ifdef __KERNEL__
  56
  57#include <linux/skbuff.h>
  58
  59/***************************************************************************/
  60/* Extensions made by Werner Cornelius (werner@ikt.de)                     */
  61/*                                                                         */ 
  62/* The proceed command holds a incoming call in a state to leave processes */
  63/* enough time to check whether ist should be accepted.                    */
  64/* The PROT_IO Command extends the interface to make protocol dependent    */
  65/* features available (call diversion, call waiting...).                   */
  66/*                                                                         */ 
  67/* The PROT_IO Command is executed with the desired driver id and the arg  */
  68/* parameter coded as follows:                                             */
  69/* The lower 8 bits of arg contain the desired protocol from ISDN_PTYPE    */
  70/* definitions. The upper 24 bits represent the protocol specific cmd/stat.*/
  71/* Any additional data is protocol and command specific.                   */
  72/* This mechanism also applies to the statcallb callback STAT_PROT.        */    
  73/*                                                                         */
  74/* This suggested extension permits an easy expansion of protocol specific */
  75/* handling. Extensions may be added at any time without changing the HL   */
  76/* driver code and not getting conflicts without certifications.           */
  77/* The well known CAPI 2.0 interface handles such extensions in a similar  */
  78/* way. Perhaps a protocol specific module may be added and separately     */
  79/* loaded and linked to the basic isdn module for handling.                */                    
  80/***************************************************************************/
  81
  82/*****************/
  83/* DSS1 commands */ 
  84/*****************/
  85#define DSS1_CMD_INVOKE       ((0x00 << 8) | ISDN_PTYPE_EURO)   /* invoke a supplementary service */
  86#define DSS1_CMD_INVOKE_ABORT ((0x01 << 8) | ISDN_PTYPE_EURO)   /* abort a invoke cmd */
  87
  88/*******************************/
  89/* DSS1 Status callback values */
  90/*******************************/
  91#define DSS1_STAT_INVOKE_RES  ((0x80 << 8) | ISDN_PTYPE_EURO)   /* Result for invocation */
  92#define DSS1_STAT_INVOKE_ERR  ((0x81 << 8) | ISDN_PTYPE_EURO)   /* Error Return for invocation */
  93#define DSS1_STAT_INVOKE_BRD  ((0x82 << 8) | ISDN_PTYPE_EURO)   /* Deliver invoke broadcast info */
  94
  95
  96/*********************************************************************/
  97/* structures for DSS1 commands and callback                         */
  98/*                                                                   */
  99/* An action is invoked by sending a DSS1_CMD_INVOKE. The ll_id, proc*/
 100/* timeout, datalen and data fields must be set before calling.      */
 101/*                                                                   */
 102/* The return value is a positive hl_id value also delivered in the  */
 103/* hl_id field. A value of zero signals no more left hl_id capacitys.*/
 104/* A negative return value signals errors in LL. So if the return    */
 105/* value is <= 0 no action in LL will be taken -> request ignored    */
 106/*                                                                   */
 107/* The timeout field must be filled with a positive value specifying */
 108/* the amount of time the INVOKED process waits for a reaction from  */
 109/* the network.                                                      */
 110/* If a response (either error or result) is received during this    */
 111/* intervall, a reporting callback is initiated and the process will */
 112/* be deleted, the hl identifier will be freed.                      */
 113/* If no response is received during the specified intervall, a error*/
 114/* callback is initiated with timeout set to -1 and a datalen set    */
 115/* to 0.                                                             */
 116/* If timeout is set to a value <= 0 during INVOCATION the process is*/
 117/* immediately deleted after sending the data. No callback occurs !  */
 118/*                                                                   */
 119/* A currently waiting process may be aborted with INVOKE_ABORT. No  */
 120/* callback will occur when a process has been aborted.              */
 121/*                                                                   */
 122/* Broadcast invoke frames from the network are reported via the     */
 123/* STAT_INVOKE_BRD callback. The ll_id is set to 0, the other fields */
 124/* are supplied by the network and not by the HL.                    */   
 125/*********************************************************************/
 126
 127/*****************/
 128/* NI1 commands */ 
 129/*****************/
 130#define NI1_CMD_INVOKE       ((0x00 << 8) | ISDN_PTYPE_NI1)   /* invoke a supplementary service */
 131#define NI1_CMD_INVOKE_ABORT ((0x01 << 8) | ISDN_PTYPE_NI1)   /* abort a invoke cmd */
 132
 133/*******************************/
 134/* NI1 Status callback values */
 135/*******************************/
 136#define NI1_STAT_INVOKE_RES  ((0x80 << 8) | ISDN_PTYPE_NI1)   /* Result for invocation */
 137#define NI1_STAT_INVOKE_ERR  ((0x81 << 8) | ISDN_PTYPE_NI1)   /* Error Return for invocation */
 138#define NI1_STAT_INVOKE_BRD  ((0x82 << 8) | ISDN_PTYPE_NI1)   /* Deliver invoke broadcast info */
 139
 140typedef struct
 141  { ulong ll_id; /* ID supplied by LL when executing    */
 142                 /* a command and returned by HL for    */
 143                 /* INVOKE_RES and INVOKE_ERR           */
 144    int hl_id;   /* ID supplied by HL when called       */
 145                 /* for executing a cmd and delivered   */
 146                 /* for results and errors              */
 147                 /* must be supplied by LL when aborting*/  
 148    int proc;    /* invoke procedure used by CMD_INVOKE */
 149                 /* returned by callback and broadcast  */ 
 150    int timeout; /* timeout for INVOKE CMD in ms        */
 151                 /* -1  in stat callback when timed out */
 152                 /* error value when error callback     */
 153    int datalen; /* length of cmd or stat data          */
 154    u_char *data;/* pointer to data delivered or send   */
 155  } isdn_cmd_stat;
 156
 157/*
 158 * Commands from linklevel to lowlevel
 159 *
 160 */
 161#define ISDN_CMD_IOCTL    0       /* Perform ioctl                         */
 162#define ISDN_CMD_DIAL     1       /* Dial out                              */
 163#define ISDN_CMD_ACCEPTD  2       /* Accept an incoming call on D-Chan.    */
 164#define ISDN_CMD_ACCEPTB  3       /* Request B-Channel connect.            */
 165#define ISDN_CMD_HANGUP   4       /* Hangup                                */
 166#define ISDN_CMD_CLREAZ   5       /* Clear EAZ(s) of channel               */
 167#define ISDN_CMD_SETEAZ   6       /* Set EAZ(s) of channel                 */
 168#define ISDN_CMD_GETEAZ   7       /* Get EAZ(s) of channel                 */
 169#define ISDN_CMD_SETSIL   8       /* Set Service-Indicator-List of channel */
 170#define ISDN_CMD_GETSIL   9       /* Get Service-Indicator-List of channel */
 171#define ISDN_CMD_SETL2   10       /* Set B-Chan. Layer2-Parameter          */
 172#define ISDN_CMD_GETL2   11       /* Get B-Chan. Layer2-Parameter          */
 173#define ISDN_CMD_SETL3   12       /* Set B-Chan. Layer3-Parameter          */
 174#define ISDN_CMD_GETL3   13       /* Get B-Chan. Layer3-Parameter          */
 175// #define ISDN_CMD_LOCK    14       /* Signal usage by upper levels          */
 176// #define ISDN_CMD_UNLOCK  15       /* Release usage-lock                    */
 177#define ISDN_CMD_SUSPEND 16       /* Suspend connection                    */
 178#define ISDN_CMD_RESUME  17       /* Resume connection                     */
 179#define ISDN_CMD_PROCEED 18       /* Proceed with call establishment       */
 180#define ISDN_CMD_ALERT   19       /* Alert after Proceeding                */
 181#define ISDN_CMD_REDIR   20       /* Redir a incoming call                 */
 182#define ISDN_CMD_PROT_IO 21       /* Protocol specific commands            */
 183#define CAPI_PUT_MESSAGE 22       /* CAPI message send down or up          */
 184#define ISDN_CMD_FAXCMD  23       /* FAX commands to HL-driver             */
 185#define ISDN_CMD_AUDIO   24       /* DSP, DTMF, ... settings               */
 186
 187/*
 188 * Status-Values delivered from lowlevel to linklevel via
 189 * statcallb().
 190 *
 191 */
 192#define ISDN_STAT_STAVAIL 256    /* Raw status-data available             */
 193#define ISDN_STAT_ICALL   257    /* Incoming call detected                */
 194#define ISDN_STAT_RUN     258    /* Signal protocol-code is running       */
 195#define ISDN_STAT_STOP    259    /* Signal halt of protocol-code          */
 196#define ISDN_STAT_DCONN   260    /* Signal D-Channel connect              */
 197#define ISDN_STAT_BCONN   261    /* Signal B-Channel connect              */
 198#define ISDN_STAT_DHUP    262    /* Signal D-Channel disconnect           */
 199#define ISDN_STAT_BHUP    263    /* Signal B-Channel disconnect           */
 200#define ISDN_STAT_CINF    264    /* Charge-Info                           */
 201#define ISDN_STAT_LOAD    265    /* Signal new lowlevel-driver is loaded  */
 202#define ISDN_STAT_UNLOAD  266    /* Signal unload of lowlevel-driver      */
 203#define ISDN_STAT_BSENT   267    /* Signal packet sent                    */
 204#define ISDN_STAT_NODCH   268    /* Signal no D-Channel                   */
 205#define ISDN_STAT_ADDCH   269    /* Add more Channels                     */
 206#define ISDN_STAT_CAUSE   270    /* Cause-Message                         */
 207#define ISDN_STAT_ICALLW  271    /* Incoming call without B-chan waiting  */
 208#define ISDN_STAT_REDIR   272    /* Redir result                          */
 209#define ISDN_STAT_PROT    273    /* protocol IO specific callback         */
 210#define ISDN_STAT_DISPLAY 274    /* deliver a received display message    */
 211#define ISDN_STAT_L1ERR   275    /* Signal Layer-1 Error                  */
 212#define ISDN_STAT_FAXIND  276    /* FAX indications from HL-driver        */
 213#define ISDN_STAT_AUDIO   277    /* DTMF, DSP indications                 */
 214#define ISDN_STAT_DISCH   278    /* Disable/Enable channel usage          */
 215
 216/*
 217 * Audio commands
 218 */
 219#define ISDN_AUDIO_SETDD        0       /* Set DTMF detection           */
 220#define ISDN_AUDIO_DTMF         1       /* Rx/Tx DTMF                   */
 221
 222/*
 223 * Values for errcode field
 224 */
 225#define ISDN_STAT_L1ERR_SEND 1
 226#define ISDN_STAT_L1ERR_RECV 2
 227
 228/*
 229 * Values for feature-field of interface-struct.
 230 */
 231/* Layer 2 */
 232#define ISDN_FEATURE_L2_X75I    (0x0001 << ISDN_PROTO_L2_X75I)
 233#define ISDN_FEATURE_L2_X75UI   (0x0001 << ISDN_PROTO_L2_X75UI)
 234#define ISDN_FEATURE_L2_X75BUI  (0x0001 << ISDN_PROTO_L2_X75BUI)
 235#define ISDN_FEATURE_L2_HDLC    (0x0001 << ISDN_PROTO_L2_HDLC)
 236#define ISDN_FEATURE_L2_TRANS   (0x0001 << ISDN_PROTO_L2_TRANS)
 237#define ISDN_FEATURE_L2_X25DTE  (0x0001 << ISDN_PROTO_L2_X25DTE)
 238#define ISDN_FEATURE_L2_X25DCE  (0x0001 << ISDN_PROTO_L2_X25DCE)
 239#define ISDN_FEATURE_L2_V11096  (0x0001 << ISDN_PROTO_L2_V11096)
 240#define ISDN_FEATURE_L2_V11019  (0x0001 << ISDN_PROTO_L2_V11019)
 241#define ISDN_FEATURE_L2_V11038  (0x0001 << ISDN_PROTO_L2_V11038)
 242#define ISDN_FEATURE_L2_MODEM   (0x0001 << ISDN_PROTO_L2_MODEM)
 243#define ISDN_FEATURE_L2_FAX     (0x0001 << ISDN_PROTO_L2_FAX)
 244#define ISDN_FEATURE_L2_HDLC_56K (0x0001 << ISDN_PROTO_L2_HDLC_56K)
 245
 246#define ISDN_FEATURE_L2_MASK    (0x0FFFF) /* Max. 16 protocols */
 247#define ISDN_FEATURE_L2_SHIFT   (0)
 248
 249/* Layer 3 */
 250#define ISDN_FEATURE_L3_TRANS   (0x10000 << ISDN_PROTO_L3_TRANS)
 251#define ISDN_FEATURE_L3_TRANSDSP (0x10000 << ISDN_PROTO_L3_TRANSDSP)
 252#define ISDN_FEATURE_L3_FCLASS2 (0x10000 << ISDN_PROTO_L3_FCLASS2)
 253#define ISDN_FEATURE_L3_FCLASS1 (0x10000 << ISDN_PROTO_L3_FCLASS1)
 254
 255#define ISDN_FEATURE_L3_MASK    (0x0FF0000) /* Max. 8 Protocols */
 256#define ISDN_FEATURE_L3_SHIFT   (16)
 257
 258/* Signaling */
 259#define ISDN_FEATURE_P_UNKNOWN  (0x1000000 << ISDN_PTYPE_UNKNOWN)
 260#define ISDN_FEATURE_P_1TR6     (0x1000000 << ISDN_PTYPE_1TR6)
 261#define ISDN_FEATURE_P_EURO     (0x1000000 << ISDN_PTYPE_EURO)
 262#define ISDN_FEATURE_P_NI1      (0x1000000 << ISDN_PTYPE_NI1)
 263
 264#define ISDN_FEATURE_P_MASK     (0x0FF000000) /* Max. 8 Protocols */
 265#define ISDN_FEATURE_P_SHIFT    (24)
 266
 267typedef struct setup_parm {
 268    unsigned char phone[32];    /* Remote Phone-Number */
 269    unsigned char eazmsn[32];   /* Local EAZ or MSN    */
 270    unsigned char si1;      /* Service Indicator 1 */
 271    unsigned char si2;      /* Service Indicator 2 */
 272    unsigned char plan;     /* Numbering plan      */
 273    unsigned char screen;   /* Screening info      */
 274} setup_parm;
 275
 276
 277#ifdef CONFIG_ISDN_TTY_FAX
 278/* T.30 Fax G3 */
 279
 280#define FAXIDLEN 21
 281
 282typedef struct T30_s {
 283        /* session parameters */
 284        __u8 resolution;
 285        __u8 rate;
 286        __u8 width;
 287        __u8 length;
 288        __u8 compression;
 289        __u8 ecm;
 290        __u8 binary;
 291        __u8 scantime;
 292        __u8 id[FAXIDLEN];
 293        /* additional parameters */
 294        __u8 phase;
 295        __u8 direction;
 296        __u8 code;
 297        __u8 badlin;
 298        __u8 badmul;
 299        __u8 bor;
 300        __u8 fet;
 301        __u8 pollid[FAXIDLEN];
 302        __u8 cq;
 303        __u8 cr;
 304        __u8 ctcrty;
 305        __u8 minsp;
 306        __u8 phcto;
 307        __u8 rel;
 308        __u8 nbc;
 309        /* remote station parameters */
 310        __u8 r_resolution;
 311        __u8 r_rate;
 312        __u8 r_width;
 313        __u8 r_length;
 314        __u8 r_compression;
 315        __u8 r_ecm;
 316        __u8 r_binary;
 317        __u8 r_scantime;
 318        __u8 r_id[FAXIDLEN];
 319        __u8 r_code;
 320} __packed T30_s;
 321
 322#define ISDN_TTY_FAX_CONN_IN    0
 323#define ISDN_TTY_FAX_CONN_OUT   1
 324
 325#define ISDN_TTY_FAX_FCON       0
 326#define ISDN_TTY_FAX_DIS        1
 327#define ISDN_TTY_FAX_FTT        2
 328#define ISDN_TTY_FAX_MCF        3
 329#define ISDN_TTY_FAX_DCS        4
 330#define ISDN_TTY_FAX_TRAIN_OK   5
 331#define ISDN_TTY_FAX_EOP        6
 332#define ISDN_TTY_FAX_EOM        7
 333#define ISDN_TTY_FAX_MPS        8
 334#define ISDN_TTY_FAX_DTC        9
 335#define ISDN_TTY_FAX_RID        10
 336#define ISDN_TTY_FAX_HNG        11
 337#define ISDN_TTY_FAX_DT         12
 338#define ISDN_TTY_FAX_FCON_I     13
 339#define ISDN_TTY_FAX_DR         14
 340#define ISDN_TTY_FAX_ET         15
 341#define ISDN_TTY_FAX_CFR        16
 342#define ISDN_TTY_FAX_PTS        17
 343#define ISDN_TTY_FAX_SENT       18
 344
 345#define ISDN_FAX_PHASE_IDLE     0
 346#define ISDN_FAX_PHASE_A        1
 347#define ISDN_FAX_PHASE_B        2
 348#define ISDN_FAX_PHASE_C        3
 349#define ISDN_FAX_PHASE_D        4
 350#define ISDN_FAX_PHASE_E        5
 351
 352#endif /* TTY_FAX */
 353
 354#define ISDN_FAX_CLASS1_FAE     0
 355#define ISDN_FAX_CLASS1_FTS     1
 356#define ISDN_FAX_CLASS1_FRS     2
 357#define ISDN_FAX_CLASS1_FTM     3
 358#define ISDN_FAX_CLASS1_FRM     4
 359#define ISDN_FAX_CLASS1_FTH     5
 360#define ISDN_FAX_CLASS1_FRH     6
 361#define ISDN_FAX_CLASS1_CTRL    7
 362
 363#define ISDN_FAX_CLASS1_OK      0
 364#define ISDN_FAX_CLASS1_CONNECT 1
 365#define ISDN_FAX_CLASS1_NOCARR  2
 366#define ISDN_FAX_CLASS1_ERROR   3
 367#define ISDN_FAX_CLASS1_FCERROR 4
 368#define ISDN_FAX_CLASS1_QUERY   5
 369
 370typedef struct {
 371        __u8    cmd;
 372        __u8    subcmd;
 373        __u8    para[50];
 374} aux_s;
 375
 376#define AT_COMMAND      0
 377#define AT_EQ_VALUE     1
 378#define AT_QUERY        2
 379#define AT_EQ_QUERY     3
 380
 381/* CAPI structs */
 382
 383/* this is compatible to the old union size */
 384#define MAX_CAPI_PARA_LEN 50
 385
 386typedef struct {
 387        /* Header */
 388        __u16 Length;
 389        __u16 ApplId;
 390        __u8 Command;
 391        __u8 Subcommand;
 392        __u16 Messagenumber;
 393
 394        /* Parameter */
 395        union {
 396                __u32 Controller;
 397                __u32 PLCI;
 398                __u32 NCCI;
 399        } adr;
 400        __u8 para[MAX_CAPI_PARA_LEN];
 401} capi_msg;
 402
 403/*
 404 * Structure for exchanging above infos
 405 *
 406 */
 407typedef struct {
 408        int   driver;           /* Lowlevel-Driver-ID            */
 409        int   command;          /* Command or Status (see above) */
 410        ulong arg;              /* Additional Data               */
 411        union {
 412                ulong errcode;  /* Type of error with STAT_L1ERR        */
 413                int length;     /* Amount of bytes sent with STAT_BSENT */
 414                u_char num[50]; /* Additional Data                      */
 415                setup_parm setup;/* For SETUP msg                       */
 416                capi_msg cmsg;  /* For CAPI like messages               */
 417                char display[85];/* display message data                */ 
 418                isdn_cmd_stat isdn_io; /* ISDN IO-parameter/result      */
 419                aux_s aux;      /* for modem commands/indications       */
 420#ifdef CONFIG_ISDN_TTY_FAX
 421                T30_s   *fax;   /* Pointer to ttys fax struct           */
 422#endif
 423                ulong userdata; /* User Data */
 424        } parm;
 425} isdn_ctrl;
 426
 427#define dss1_io    isdn_io
 428#define ni1_io     isdn_io
 429
 430/*
 431 * The interface-struct itself (initialized at load-time of lowlevel-driver)
 432 *
 433 * See Documentation/isdn/INTERFACE for a description, how the communication
 434 * between the ISDN subsystem and its drivers is done.
 435 *
 436 */
 437typedef struct {
 438  struct module *owner;
 439
 440  /* Number of channels supported by this driver
 441   */
 442  int channels;
 443
 444  /* 
 445   * Maximum Size of transmit/receive-buffer this driver supports.
 446   */
 447  int maxbufsize;
 448
 449  /* Feature-Flags for this driver.
 450   * See defines ISDN_FEATURE_... for Values
 451   */
 452  unsigned long features;
 453
 454  /*
 455   * Needed for calculating
 456   * dev->hard_header_len = linklayer header + hl_hdrlen;
 457   * Drivers, not supporting sk_buff's should set this to 0.
 458   */
 459  unsigned short hl_hdrlen;
 460
 461  /*
 462   * Receive-Callback using sk_buff's
 463   * Parameters:
 464   *             int                    Driver-ID
 465   *             int                    local channel-number (0 ...)
 466   *             struct sk_buff *skb    received Data
 467   */
 468  void (*rcvcallb_skb)(int, int, struct sk_buff *);
 469
 470  /* Status-Callback
 471   * Parameters:
 472   *             isdn_ctrl*
 473   *                   driver  = Driver ID.
 474   *                   command = One of above ISDN_STAT_... constants.
 475   *                   arg     = depending on status-type.
 476   *                   num     = depending on status-type.
 477   */
 478  int (*statcallb)(isdn_ctrl*);
 479
 480  /* Send command
 481   * Parameters:
 482   *             isdn_ctrl*
 483   *                   driver  = Driver ID.
 484   *                   command = One of above ISDN_CMD_... constants.
 485   *                   arg     = depending on command.
 486   *                   num     = depending on command.
 487   */
 488  int (*command)(isdn_ctrl*);
 489
 490  /*
 491   * Send data using sk_buff's
 492   * Parameters:
 493   *             int                    driverId
 494   *             int                    local channel-number (0...)
 495   *             int                    Flag: Need ACK for this packet.
 496   *             struct sk_buff *skb    Data to send
 497   */
 498  int (*writebuf_skb) (int, int, int, struct sk_buff *);
 499
 500  /* Send raw D-Channel-Commands
 501   * Parameters:
 502   *             u_char pointer data
 503   *             int    length of data
 504   *             int    driverId
 505   *             int    local channel-number (0 ...)
 506   */
 507  int (*writecmd)(const u_char __user *, int, int, int);
 508
 509  /* Read raw Status replies
 510   *             u_char pointer data (volatile)
 511   *             int    length of buffer
 512   *             int    driverId
 513   *             int    local channel-number (0 ...)
 514   */
 515  int (*readstat)(u_char __user *, int, int, int);
 516
 517  char id[20];
 518} isdn_if;
 519
 520/*
 521 * Function which must be called by lowlevel-driver at loadtime with
 522 * the following fields of above struct set:
 523 *
 524 * channels     Number of channels that will be supported.
 525 * hl_hdrlen    Space to preserve in sk_buff's when sending. Drivers, not
 526 *              supporting sk_buff's should set this to 0.
 527 * command      Address of Command-Handler.
 528 * features     Bitwise coded Features of this driver. (use ISDN_FEATURE_...)
 529 * writebuf_skb Address of Skbuff-Send-Handler.
 530 * writecmd        "    "  D-Channel  " which accepts raw D-Ch-Commands.
 531 * readstat        "    "  D-Channel  " which delivers raw Status-Data.
 532 *
 533 * The linklevel-driver fills the following fields:
 534 *
 535 * channels      Driver-ID assigned to this driver. (Must be used on all
 536 *               subsequent callbacks.
 537 * rcvcallb_skb  Address of handler for received Skbuff's.
 538 * statcallb        "    "     "    for status-changes.
 539 *
 540 */
 541extern int register_isdn(isdn_if*);
 542#include <asm/uaccess.h>
 543
 544#endif /* __KERNEL__ */
 545
 546#endif /* __ISDNIF_H__ */
 547
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