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} __attribute__((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