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