include/linux/isdnif.h

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