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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/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
141typedef 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
268typedef 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
283typedef struct T30_s {
284 /* session parameters */
285 __u8 resolution __attribute__ ((packed));
286 __u8 rate __attribute__ ((packed));
287 __u8 width __attribute__ ((packed));
288 __u8 length __attribute__ ((packed));
289 __u8 compression __attribute__ ((packed));
290 __u8 ecm __attribute__ ((packed));
291 __u8 binary __attribute__ ((packed));
292 __u8 scantime __attribute__ ((packed));
293 __u8 id[FAXIDLEN] __attribute__ ((packed));
294 /* additional parameters */
295 __u8 phase __attribute__ ((packed));
296 __u8 direction __attribute__ ((packed));
297 __u8 code __attribute__ ((packed));
298 __u8 badlin __attribute__ ((packed));
299 __u8 badmul __attribute__ ((packed));
300 __u8 bor __attribute__ ((packed));
301 __u8 fet __attribute__ ((packed));
302 __u8 pollid[FAXIDLEN] __attribute__ ((packed));
303 __u8 cq __attribute__ ((packed));
304 __u8 cr __attribute__ ((packed));
305 __u8 ctcrty __attribute__ ((packed));
306 __u8 minsp __attribute__ ((packed));
307 __u8 phcto __attribute__ ((packed));
308 __u8 rel __attribute__ ((packed));
309 __u8 nbc __attribute__ ((packed));
310 /* remote station parameters */
311 __u8 r_resolution __attribute__ ((packed));
312 __u8 r_rate __attribute__ ((packed));
313 __u8 r_width __attribute__ ((packed));
314 __u8 r_length __attribute__ ((packed));
315 __u8 r_compression __attribute__ ((packed));
316 __u8 r_ecm __attribute__ ((packed));
317 __u8 r_binary __attribute__ ((packed));
318 __u8 r_scantime __attribute__ ((packed));
319 __u8 r_id[FAXIDLEN] __attribute__ ((packed));
320 __u8 r_code __attribute__ ((packed));
321} 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
371typedef 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
387typedef 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 */
408typedef 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 */
438typedef 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 */
542extern int register_isdn(isdn_if*);
543#include <asm/uaccess.h>
544
545#endif /* __KERNEL__ */
546
547#endif /* __ISDNIF_H__ */
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