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   1 /*
   2  * Kernel CAPI interface for the Gigaset driver
   3  *
   4  * Copyright (c) 2009 by Tilman Schmidt <tilman@imap.cc>.
   5  *
   6  * =====================================================================
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License as
   9  *      published by the Free Software Foundation; either version 2 of
  10  *      the License, or (at your option) any later version.
  11  * =====================================================================
  12  */
  13
  14 #include "gigaset.h"
  15 #include <linux/ctype.h>
  16 #include <linux/isdn/capilli.h>
  17 #include <linux/isdn/capicmd.h>
  18 #include <linux/isdn/capiutil.h>
  19
  20 /* missing from kernelcapi.h */
  21 #define CapiNcpiNotSupportedByProtocol  0x0001
  22 #define CapiFlagsNotSupportedByProtocol 0x0002
  23 #define CapiAlertAlreadySent            0x0003
  24 #define CapiFacilitySpecificFunctionNotSupported        0x3011
  25
  26 /* missing from capicmd.h */
  27 #define CAPI_CONNECT_IND_BASELEN        (CAPI_MSG_BASELEN+4+2+8*1)
  28 #define CAPI_CONNECT_ACTIVE_IND_BASELEN (CAPI_MSG_BASELEN+4+3*1)
  29 #define CAPI_CONNECT_B3_IND_BASELEN     (CAPI_MSG_BASELEN+4+1)
  30 #define CAPI_CONNECT_B3_ACTIVE_IND_BASELEN      (CAPI_MSG_BASELEN+4+1)
  31 #define CAPI_DATA_B3_REQ_LEN64          (CAPI_MSG_BASELEN+4+4+2+2+2+8)
  32 #define CAPI_DATA_B3_CONF_LEN           (CAPI_MSG_BASELEN+4+2+2)
  33 #define CAPI_DISCONNECT_IND_LEN         (CAPI_MSG_BASELEN+4+2)
  34 #define CAPI_DISCONNECT_B3_IND_BASELEN  (CAPI_MSG_BASELEN+4+2+1)
  35 #define CAPI_FACILITY_CONF_BASELEN      (CAPI_MSG_BASELEN+4+2+2+1)
  36 /* most _CONF messages contain only Controller/PLCI/NCCI and Info parameters */
  37 #define CAPI_STDCONF_LEN                (CAPI_MSG_BASELEN+4+2)
  38
  39 #define CAPI_FACILITY_HANDSET   0x0000
  40 #define CAPI_FACILITY_DTMF      0x0001
  41 #define CAPI_FACILITY_V42BIS    0x0002
  42 #define CAPI_FACILITY_SUPPSVC   0x0003
  43 #define CAPI_FACILITY_WAKEUP    0x0004
  44 #define CAPI_FACILITY_LI        0x0005
  45
  46 #define CAPI_SUPPSVC_GETSUPPORTED       0x0000
  47
  48 /* missing from capiutil.h */
  49 #define CAPIMSG_PLCI_PART(m)    CAPIMSG_U8(m, 9)
  50 #define CAPIMSG_NCCI_PART(m)    CAPIMSG_U16(m, 10)
  51 #define CAPIMSG_HANDLE_REQ(m)   CAPIMSG_U16(m, 18) /* DATA_B3_REQ/_IND only! */
  52 #define CAPIMSG_FLAGS(m)        CAPIMSG_U16(m, 20)
  53 #define CAPIMSG_SETCONTROLLER(m, contr) capimsg_setu8(m, 8, contr)
  54 #define CAPIMSG_SETPLCI_PART(m, plci)   capimsg_setu8(m, 9, plci)
  55 #define CAPIMSG_SETNCCI_PART(m, ncci)   capimsg_setu16(m, 10, ncci)
  56 #define CAPIMSG_SETFLAGS(m, flags)      capimsg_setu16(m, 20, flags)
  57
  58 /* parameters with differing location in DATA_B3_CONF/_RESP: */
  59 #define CAPIMSG_SETHANDLE_CONF(m, handle)       capimsg_setu16(m, 12, handle)
  60 #define CAPIMSG_SETINFO_CONF(m, info)           capimsg_setu16(m, 14, info)
  61
  62 /* Flags (DATA_B3_REQ/_IND) */
  63 #define CAPI_FLAGS_DELIVERY_CONFIRMATION        0x04
  64 #define CAPI_FLAGS_RESERVED                     (~0x1f)
  65
  66 /* buffer sizes */
  67 #define MAX_BC_OCTETS 11
  68 #define MAX_HLC_OCTETS 3
  69 #define MAX_NUMBER_DIGITS 20
  70 #define MAX_FMT_IE_LEN 20
  71
  72 /* values for gigaset_capi_appl.connected */
  73 #define APCONN_NONE     0       /* inactive/listening */
  74 #define APCONN_SETUP    1       /* connecting */
  75 #define APCONN_ACTIVE   2       /* B channel up */
  76
  77 /* registered application data structure */
  78 struct gigaset_capi_appl {
  79         struct list_head ctrlist;
  80         struct gigaset_capi_appl *bcnext;
  81         u16 id;
  82         u16 nextMessageNumber;
  83         u32 listenInfoMask;
  84         u32 listenCIPmask;
  85         int connected;
  86 };
  87
  88 /* CAPI specific controller data structure */
  89 struct gigaset_capi_ctr {
  90         struct capi_ctr ctr;
  91         struct list_head appls;
  92         struct sk_buff_head sendqueue;
  93         atomic_t sendqlen;
  94         /* two _cmsg structures possibly used concurrently: */
  95         _cmsg hcmsg;    /* for message composition triggered from hardware */
  96         _cmsg acmsg;    /* for dissection of messages sent from application */
  97         u8 bc_buf[MAX_BC_OCTETS+1];
  98         u8 hlc_buf[MAX_HLC_OCTETS+1];
  99         u8 cgpty_buf[MAX_NUMBER_DIGITS+3];
 100         u8 cdpty_buf[MAX_NUMBER_DIGITS+2];
 101 };
 102
 103 /* CIP Value table (from CAPI 2.0 standard, ch. 6.1) */
 104 static struct {
 105         u8 *bc;
 106         u8 *hlc;
 107 } cip2bchlc[] = {
 108         [1] = { "8090A3", NULL },
 109                 /* Speech (A-law) */
 110         [2] = { "8890", NULL },
 111                 /* Unrestricted digital information */
 112         [3] = { "8990", NULL },
 113                 /* Restricted digital information */
 114         [4] = { "9090A3", NULL },
 115                 /* 3,1 kHz audio (A-law) */
 116         [5] = { "9190", NULL },
 117                 /* 7 kHz audio */
 118         [6] = { "9890", NULL },
 119                 /* Video */
 120         [7] = { "88C0C6E6", NULL },
 121                 /* Packet mode */
 122         [8] = { "8890218F", NULL },
 123                 /* 56 kbit/s rate adaptation */
 124         [9] = { "9190A5", NULL },
 125                 /* Unrestricted digital information with tones/announcements */
 126         [16] = { "8090A3", "9181" },
 127                 /* Telephony */
 128         [17] = { "9090A3", "9184" },
 129                 /* Group 2/3 facsimile */
 130         [18] = { "8890", "91A1" },
 131                 /* Group 4 facsimile Class 1 */
 132         [19] = { "8890", "91A4" },
 133                 /* Teletex service basic and mixed mode
 134                    and Group 4 facsimile service Classes II and III */
 135         [20] = { "8890", "91A8" },
 136                 /* Teletex service basic and processable mode */
 137         [21] = { "8890", "91B1" },
 138                 /* Teletex service basic mode */
 139         [22] = { "8890", "91B2" },
 140                 /* International interworking for Videotex */
 141         [23] = { "8890", "91B5" },
 142                 /* Telex */
 143         [24] = { "8890", "91B8" },
 144                 /* Message Handling Systems in accordance with X.400 */
 145         [25] = { "8890", "91C1" },
 146                 /* OSI application in accordance with X.200 */
 147         [26] = { "9190A5", "9181" },
 148                 /* 7 kHz telephony */
 149         [27] = { "9190A5", "916001" },
 150                 /* Video telephony, first connection */
 151         [28] = { "8890", "916002" },
 152                 /* Video telephony, second connection */
 153 };
 154
 155 /*
 156  * helper functions
 157  * ================
 158  */
 159
 160 /*
 161  * emit unsupported parameter warning
 162  */
 163 static inline void ignore_cstruct_param(struct cardstate *cs, _cstruct param,
 164                                        char *msgname, char *paramname)
 165 {
 166         if (param && *param)
 167                 dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
 168                          msgname, paramname);
 169 }
 170
 171 static inline void ignore_cmstruct_param(struct cardstate *cs, _cmstruct param,
 172                                        char *msgname, char *paramname)
 173 {
 174         if (param != CAPI_DEFAULT)
 175                 dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
 176                          msgname, paramname);
 177 }
 178
 179 /*
 180  * check for legal hex digit
 181  */
 182 static inline int ishexdigit(char c)
 183 {
 184         if (c >= '0' && c <= '9')
 185                 return 1;
 186         if (c >= 'A' && c <= 'F')
 187                 return 1;
 188         if (c >= 'a' && c <= 'f')
 189                 return 1;
 190         return 0;
 191 }
 192
 193 /*
 194  * convert hex to binary
 195  */
 196 static inline u8 hex2bin(char c)
 197 {
 198         int result = c & 0x0f;
 199         if (c & 0x40)
 200                 result += 9;
 201         return result;
 202 }
 203
 204 /*
 205  * convert an IE from Gigaset hex string to ETSI binary representation
 206  * including length byte
 207  * return value: result length, -1 on error
 208  */
 209 static int encode_ie(char *in, u8 *out, int maxlen)
 210 {
 211         int l = 0;
 212         while (*in) {
 213                 if (!ishexdigit(in[0]) || !ishexdigit(in[1]) || l >= maxlen)
 214                         return -1;
 215                 out[++l] = (hex2bin(in[0]) << 4) + hex2bin(in[1]);
 216                 in += 2;
 217         }
 218         out[0] = l;
 219         return l;
 220 }
 221
 222 /*
 223  * convert an IE from ETSI binary representation including length byte
 224  * to Gigaset hex string
 225  */
 226 static void decode_ie(u8 *in, char *out)
 227 {
 228         int i = *in;
 229         while (i-- > 0) {
 230                 /* ToDo: conversion to upper case necessary? */
 231                 *out++ = toupper(hex_asc_hi(*++in));
 232                 *out++ = toupper(hex_asc_lo(*in));
 233         }
 234 }
 235
 236 /*
 237  * retrieve application data structure for an application ID
 238  */
 239 static inline struct gigaset_capi_appl *
 240 get_appl(struct gigaset_capi_ctr *iif, u16 appl)
 241 {
 242         struct gigaset_capi_appl *ap;
 243
 244         list_for_each_entry(ap, &iif->appls, ctrlist)
 245                 if (ap->id == appl)
 246                         return ap;
 247         return NULL;
 248 }
 249
 250 /*
 251  * dump CAPI message to kernel messages for debugging
 252  */
 253 static inline void dump_cmsg(enum debuglevel level, const char *tag, _cmsg *p)
 254 {
 255 #ifdef CONFIG_GIGASET_DEBUG
 256         _cdebbuf *cdb;
 257
 258         if (!(gigaset_debuglevel & level))
 259                 return;
 260
 261         cdb = capi_cmsg2str(p);
 262         if (cdb) {
 263                 gig_dbg(level, "%s: [%d] %s", tag, p->ApplId, cdb->buf);
 264                 cdebbuf_free(cdb);
 265         } else {
 266                 gig_dbg(level, "%s: [%d] %s", tag, p->ApplId,
 267                         capi_cmd2str(p->Command, p->Subcommand));
 268         }
 269 #endif
 270 }
 271
 272 static inline void dump_rawmsg(enum debuglevel level, const char *tag,
 273                                unsigned char *data)
 274 {
 275 #ifdef CONFIG_GIGASET_DEBUG
 276         char *dbgline;
 277         int i, l;
 278
 279         if (!(gigaset_debuglevel & level))
 280                 return;
 281
 282         l = CAPIMSG_LEN(data);
 283         if (l < 12) {
 284                 gig_dbg(level, "%s: ??? LEN=%04d", tag, l);
 285                 return;
 286         }
 287         gig_dbg(level, "%s: 0x%02x:0x%02x: ID=%03d #0x%04x LEN=%04d NCCI=0x%x",
 288                 tag, CAPIMSG_COMMAND(data), CAPIMSG_SUBCOMMAND(data),
 289                 CAPIMSG_APPID(data), CAPIMSG_MSGID(data), l,
 290                 CAPIMSG_CONTROL(data));
 291         l -= 12;
 292         dbgline = kmalloc(3*l, GFP_ATOMIC);
 293         if (!dbgline)
 294                 return;
 295         for (i = 0; i < l; i++) {
 296                 dbgline[3*i] = hex_asc_hi(data[12+i]);
 297                 dbgline[3*i+1] = hex_asc_lo(data[12+i]);
 298                 dbgline[3*i+2] = ' ';
 299         }
 300         dbgline[3*l-1] = '\0';
 301         gig_dbg(level, "  %s", dbgline);
 302         kfree(dbgline);
 303         if (CAPIMSG_COMMAND(data) == CAPI_DATA_B3 &&
 304             (CAPIMSG_SUBCOMMAND(data) == CAPI_REQ ||
 305              CAPIMSG_SUBCOMMAND(data) == CAPI_IND) &&
 306             CAPIMSG_DATALEN(data) > 0) {
 307                 l = CAPIMSG_DATALEN(data);
 308                 dbgline = kmalloc(3*l, GFP_ATOMIC);
 309                 if (!dbgline)
 310                         return;
 311                 data += CAPIMSG_LEN(data);
 312                 for (i = 0; i < l; i++) {
 313                         dbgline[3*i] = hex_asc_hi(data[i]);
 314                         dbgline[3*i+1] = hex_asc_lo(data[i]);
 315                         dbgline[3*i+2] = ' ';
 316                 }
 317                 dbgline[3*l-1] = '\0';
 318                 gig_dbg(level, "  %s", dbgline);
 319                 kfree(dbgline);
 320         }
 321 #endif
 322 }
 323
 324 /*
 325  * format CAPI IE as string
 326  */
 327
 328 static const char *format_ie(const char *ie)
 329 {
 330         static char result[3*MAX_FMT_IE_LEN];
 331         int len, count;
 332         char *pout = result;
 333
 334         if (!ie)
 335                 return "NULL";
 336
 337         count = len = ie[0];
 338         if (count > MAX_FMT_IE_LEN)
 339                 count = MAX_FMT_IE_LEN-1;
 340         while (count--) {
 341                 *pout++ = hex_asc_hi(*++ie);
 342                 *pout++ = hex_asc_lo(*ie);
 343                 *pout++ = ' ';
 344         }
 345         if (len > MAX_FMT_IE_LEN) {
 346                 *pout++ = '.';
 347                 *pout++ = '.';
 348                 *pout++ = '.';
 349         }
 350         *--pout = 0;
 351         return result;
 352 }
 353
 354
 355 /*
 356  * driver interface functions
 357  * ==========================
 358  */
 359
 360 /**
 361  * gigaset_skb_sent() - acknowledge transmission of outgoing skb
 362  * @bcs:        B channel descriptor structure.
 363  * @skb:        sent data.
 364  *
 365  * Called by hardware module {bas,ser,usb}_gigaset when the data in a
 366  * skb has been successfully sent, for signalling completion to the LL.
 367  */
 368 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *dskb)
 369 {
 370         struct cardstate *cs = bcs->cs;
 371         struct gigaset_capi_ctr *iif = cs->iif;
 372         struct gigaset_capi_appl *ap = bcs->ap;
 373         struct sk_buff *cskb;
 374         u16 flags;
 375
 376         /* update statistics */
 377         ++bcs->trans_up;
 378
 379         if (!ap) {
 380                 dev_err(cs->dev, "%s: no application\n", __func__);
 381                 return;
 382         }
 383
 384         /* don't send further B3 messages if disconnected */
 385         if (ap->connected < APCONN_ACTIVE) {
 386                 gig_dbg(DEBUG_LLDATA, "disconnected, discarding ack");
 387                 return;
 388         }
 389
 390         /* ToDo: honor unset "delivery confirmation" bit */
 391         flags = CAPIMSG_FLAGS(dskb->head);
 392
 393         /* build DATA_B3_CONF message */
 394         cskb = alloc_skb(CAPI_DATA_B3_CONF_LEN, GFP_ATOMIC);
 395         if (!cskb) {
 396                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 397                 return;
 398         }
 399         /* frequent message, avoid _cmsg overhead */
 400         CAPIMSG_SETLEN(cskb->data, CAPI_DATA_B3_CONF_LEN);
 401         CAPIMSG_SETAPPID(cskb->data, ap->id);
 402         CAPIMSG_SETCOMMAND(cskb->data, CAPI_DATA_B3);
 403         CAPIMSG_SETSUBCOMMAND(cskb->data,  CAPI_CONF);
 404         CAPIMSG_SETMSGID(cskb->data, CAPIMSG_MSGID(dskb->head));
 405         CAPIMSG_SETCONTROLLER(cskb->data, iif->ctr.cnr);
 406         CAPIMSG_SETPLCI_PART(cskb->data, bcs->channel + 1);
 407         CAPIMSG_SETNCCI_PART(cskb->data, 1);
 408         CAPIMSG_SETHANDLE_CONF(cskb->data, CAPIMSG_HANDLE_REQ(dskb->head));
 409         if (flags & ~CAPI_FLAGS_DELIVERY_CONFIRMATION)
 410                 CAPIMSG_SETINFO_CONF(cskb->data,
 411                                      CapiFlagsNotSupportedByProtocol);
 412         else
 413                 CAPIMSG_SETINFO_CONF(cskb->data, CAPI_NOERROR);
 414
 415         /* emit message */
 416         dump_rawmsg(DEBUG_LLDATA, "DATA_B3_CONF", cskb->data);
 417         capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
 418 }
 419 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 420
 421 /**
 422  * gigaset_skb_rcvd() - pass received skb to LL
 423  * @bcs:        B channel descriptor structure.
 424  * @skb:        received data.
 425  *
 426  * Called by hardware module {bas,ser,usb}_gigaset when user data has
 427  * been successfully received, for passing to the LL.
 428  * Warning: skb must not be accessed anymore!
 429  */
 430 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
 431 {
 432         struct cardstate *cs = bcs->cs;
 433         struct gigaset_capi_ctr *iif = cs->iif;
 434         struct gigaset_capi_appl *ap = bcs->ap;
 435         int len = skb->len;
 436
 437         /* update statistics */
 438         bcs->trans_down++;
 439
 440         if (!ap) {
 441                 dev_err(cs->dev, "%s: no application\n", __func__);
 442                 return;
 443         }
 444
 445         /* don't send further B3 messages if disconnected */
 446         if (ap->connected < APCONN_ACTIVE) {
 447                 gig_dbg(DEBUG_LLDATA, "disconnected, discarding data");
 448                 dev_kfree_skb(skb);
 449                 return;
 450         }
 451
 452         /*
 453          * prepend DATA_B3_IND message to payload
 454          * Parameters: NCCI = 1, all others 0/unused
 455          * frequent message, avoid _cmsg overhead
 456          */
 457         skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 458         CAPIMSG_SETLEN(skb->data, CAPI_DATA_B3_REQ_LEN);
 459         CAPIMSG_SETAPPID(skb->data, ap->id);
 460         CAPIMSG_SETCOMMAND(skb->data, CAPI_DATA_B3);
 461         CAPIMSG_SETSUBCOMMAND(skb->data,  CAPI_IND);
 462         CAPIMSG_SETMSGID(skb->data, ap->nextMessageNumber++);
 463         CAPIMSG_SETCONTROLLER(skb->data, iif->ctr.cnr);
 464         CAPIMSG_SETPLCI_PART(skb->data, bcs->channel + 1);
 465         CAPIMSG_SETNCCI_PART(skb->data, 1);
 466         /* Data parameter not used */
 467         CAPIMSG_SETDATALEN(skb->data, len);
 468         /* Data handle parameter not used */
 469         CAPIMSG_SETFLAGS(skb->data, 0);
 470         /* Data64 parameter not present */
 471
 472         /* emit message */
 473         dump_rawmsg(DEBUG_LLDATA, "DATA_B3_IND", skb->data);
 474         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 475 }
 476 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
 477
 478 /**
 479  * gigaset_isdn_rcv_err() - signal receive error
 480  * @bcs:        B channel descriptor structure.
 481  *
 482  * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 483  * has occurred, for signalling to the LL.
 484  */
 485 void gigaset_isdn_rcv_err(struct bc_state *bcs)
 486 {
 487         /* if currently ignoring packets, just count down */
 488         if (bcs->ignore) {
 489                 bcs->ignore--;
 490                 return;
 491         }
 492
 493         /* update statistics */
 494         bcs->corrupted++;
 495
 496         /* ToDo: signal error -> LL */
 497 }
 498 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
 499
 500 /**
 501  * gigaset_isdn_icall() - signal incoming call
 502  * @at_state:   connection state structure.
 503  *
 504  * Called by main module at tasklet level to notify the LL that an incoming
 505  * call has been received. @at_state contains the parameters of the call.
 506  *
 507  * Return value: call disposition (ICALL_*)
 508  */
 509 int gigaset_isdn_icall(struct at_state_t *at_state)
 510 {
 511         struct cardstate *cs = at_state->cs;
 512         struct bc_state *bcs = at_state->bcs;
 513         struct gigaset_capi_ctr *iif = cs->iif;
 514         struct gigaset_capi_appl *ap;
 515         u32 actCIPmask;
 516         struct sk_buff *skb;
 517         unsigned int msgsize;
 518         int i;
 519
 520         /*
 521          * ToDo: signal calls without a free B channel, too
 522          * (requires a u8 handle for the at_state structure that can
 523          * be stored in the PLCI and used in the CONNECT_RESP message
 524          * handler to retrieve it)
 525          */
 526         if (!bcs)
 527                 return ICALL_IGNORE;
 528
 529         /* prepare CONNECT_IND message, using B channel number as PLCI */
 530         capi_cmsg_header(&iif->hcmsg, 0, CAPI_CONNECT, CAPI_IND, 0,
 531                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 532
 533         /* minimum size, all structs empty */
 534         msgsize = CAPI_CONNECT_IND_BASELEN;
 535
 536         /* Bearer Capability (mandatory) */
 537         if (at_state->str_var[STR_ZBC]) {
 538                 /* pass on BC from Gigaset */
 539                 if (encode_ie(at_state->str_var[STR_ZBC], iif->bc_buf,
 540                               MAX_BC_OCTETS) < 0) {
 541                         dev_warn(cs->dev, "RING ignored - bad BC %s\n",
 542                                  at_state->str_var[STR_ZBC]);
 543                         return ICALL_IGNORE;
 544                 }
 545
 546                 /* look up corresponding CIP value */
 547                 iif->hcmsg.CIPValue = 0;        /* default if nothing found */
 548                 for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
 549                         if (cip2bchlc[i].bc != NULL &&
 550                             cip2bchlc[i].hlc == NULL &&
 551                             !strcmp(cip2bchlc[i].bc,
 552                                     at_state->str_var[STR_ZBC])) {
 553                                 iif->hcmsg.CIPValue = i;
 554                                 break;
 555                         }
 556         } else {
 557                 /* no BC (internal call): assume CIP 1 (speech, A-law) */
 558                 iif->hcmsg.CIPValue = 1;
 559                 encode_ie(cip2bchlc[1].bc, iif->bc_buf, MAX_BC_OCTETS);
 560         }
 561         iif->hcmsg.BC = iif->bc_buf;
 562         msgsize += iif->hcmsg.BC[0];
 563
 564         /* High Layer Compatibility (optional) */
 565         if (at_state->str_var[STR_ZHLC]) {
 566                 /* pass on HLC from Gigaset */
 567                 if (encode_ie(at_state->str_var[STR_ZHLC], iif->hlc_buf,
 568                               MAX_HLC_OCTETS) < 0) {
 569                         dev_warn(cs->dev, "RING ignored - bad HLC %s\n",
 570                                  at_state->str_var[STR_ZHLC]);
 571                         return ICALL_IGNORE;
 572                 }
 573                 iif->hcmsg.HLC = iif->hlc_buf;
 574                 msgsize += iif->hcmsg.HLC[0];
 575
 576                 /* look up corresponding CIP value */
 577                 /* keep BC based CIP value if none found */
 578                 if (at_state->str_var[STR_ZBC])
 579                         for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
 580                                 if (cip2bchlc[i].hlc != NULL &&
 581                                     !strcmp(cip2bchlc[i].hlc,
 582                                             at_state->str_var[STR_ZHLC]) &&
 583                                     !strcmp(cip2bchlc[i].bc,
 584                                             at_state->str_var[STR_ZBC])) {
 585                                         iif->hcmsg.CIPValue = i;
 586                                         break;
 587                                 }
 588         }
 589
 590         /* Called Party Number (optional) */
 591         if (at_state->str_var[STR_ZCPN]) {
 592                 i = strlen(at_state->str_var[STR_ZCPN]);
 593                 if (i > MAX_NUMBER_DIGITS) {
 594                         dev_warn(cs->dev, "RING ignored - bad number %s\n",
 595                                  at_state->str_var[STR_ZBC]);
 596                         return ICALL_IGNORE;
 597                 }
 598                 iif->cdpty_buf[0] = i + 1;
 599                 iif->cdpty_buf[1] = 0x80; /* type / numbering plan unknown */
 600                 memcpy(iif->cdpty_buf+2, at_state->str_var[STR_ZCPN], i);
 601                 iif->hcmsg.CalledPartyNumber = iif->cdpty_buf;
 602                 msgsize += iif->hcmsg.CalledPartyNumber[0];
 603         }
 604
 605         /* Calling Party Number (optional) */
 606         if (at_state->str_var[STR_NMBR]) {
 607                 i = strlen(at_state->str_var[STR_NMBR]);
 608                 if (i > MAX_NUMBER_DIGITS) {
 609                         dev_warn(cs->dev, "RING ignored - bad number %s\n",
 610                                  at_state->str_var[STR_ZBC]);
 611                         return ICALL_IGNORE;
 612                 }
 613                 iif->cgpty_buf[0] = i + 2;
 614                 iif->cgpty_buf[1] = 0x00; /* type / numbering plan unknown */
 615                 iif->cgpty_buf[2] = 0x80; /* pres. allowed, not screened */
 616                 memcpy(iif->cgpty_buf+3, at_state->str_var[STR_NMBR], i);
 617                 iif->hcmsg.CallingPartyNumber = iif->cgpty_buf;
 618                 msgsize += iif->hcmsg.CallingPartyNumber[0];
 619         }
 620
 621         /* remaining parameters (not supported, always left NULL):
 622          * - CalledPartySubaddress
 623          * - CallingPartySubaddress
 624          * - AdditionalInfo
 625          *   - BChannelinformation
 626          *   - Keypadfacility
 627          *   - Useruserdata
 628          *   - Facilitydataarray
 629          */
 630
 631         gig_dbg(DEBUG_CMD, "icall: PLCI %x CIP %d BC %s",
 632                 iif->hcmsg.adr.adrPLCI, iif->hcmsg.CIPValue,
 633                 format_ie(iif->hcmsg.BC));
 634         gig_dbg(DEBUG_CMD, "icall: HLC %s",
 635                 format_ie(iif->hcmsg.HLC));
 636         gig_dbg(DEBUG_CMD, "icall: CgPty %s",
 637                 format_ie(iif->hcmsg.CallingPartyNumber));
 638         gig_dbg(DEBUG_CMD, "icall: CdPty %s",
 639                 format_ie(iif->hcmsg.CalledPartyNumber));
 640
 641         /* scan application list for matching listeners */
 642         bcs->ap = NULL;
 643         actCIPmask = 1 | (1 << iif->hcmsg.CIPValue);
 644         list_for_each_entry(ap, &iif->appls, ctrlist)
 645                 if (actCIPmask & ap->listenCIPmask) {
 646                         /* build CONNECT_IND message for this application */
 647                         iif->hcmsg.ApplId = ap->id;
 648                         iif->hcmsg.Messagenumber = ap->nextMessageNumber++;
 649
 650                         skb = alloc_skb(msgsize, GFP_ATOMIC);
 651                         if (!skb) {
 652                                 dev_err(cs->dev, "%s: out of memory\n",
 653                                         __func__);
 654                                 break;
 655                         }
 656                         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 657                         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 658
 659                         /* add to listeners on this B channel, update state */
 660                         ap->bcnext = bcs->ap;
 661                         bcs->ap = ap;
 662                         bcs->chstate |= CHS_NOTIFY_LL;
 663                         ap->connected = APCONN_SETUP;
 664
 665                         /* emit message */
 666                         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 667                 }
 668
 669         /*
 670          * Return "accept" if any listeners.
 671          * Gigaset will send ALERTING.
 672          * There doesn't seem to be a way to avoid this.
 673          */
 674         return bcs->ap ? ICALL_ACCEPT : ICALL_IGNORE;
 675 }
 676
 677 /*
 678  * send a DISCONNECT_IND message to an application
 679  * does not sleep, clobbers the controller's hcmsg structure
 680  */
 681 static void send_disconnect_ind(struct bc_state *bcs,
 682                                 struct gigaset_capi_appl *ap, u16 reason)
 683 {
 684         struct cardstate *cs = bcs->cs;
 685         struct gigaset_capi_ctr *iif = cs->iif;
 686         struct sk_buff *skb;
 687
 688         if (ap->connected == APCONN_NONE)
 689                 return;
 690
 691         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT, CAPI_IND,
 692                          ap->nextMessageNumber++,
 693                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 694         iif->hcmsg.Reason = reason;
 695         skb = alloc_skb(CAPI_DISCONNECT_IND_LEN, GFP_ATOMIC);
 696         if (!skb) {
 697                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 698                 return;
 699         }
 700         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, CAPI_DISCONNECT_IND_LEN));
 701         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 702         ap->connected = APCONN_NONE;
 703         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 704 }
 705
 706 /*
 707  * send a DISCONNECT_B3_IND message to an application
 708  * Parameters: NCCI = 1, NCPI empty, Reason_B3 = 0
 709  * does not sleep, clobbers the controller's hcmsg structure
 710  */
 711 static void send_disconnect_b3_ind(struct bc_state *bcs,
 712                                    struct gigaset_capi_appl *ap)
 713 {
 714         struct cardstate *cs = bcs->cs;
 715         struct gigaset_capi_ctr *iif = cs->iif;
 716         struct sk_buff *skb;
 717
 718         /* nothing to do if no logical connection active */
 719         if (ap->connected < APCONN_ACTIVE)
 720                 return;
 721         ap->connected = APCONN_SETUP;
 722
 723         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
 724                          ap->nextMessageNumber++,
 725                          iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
 726         skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_ATOMIC);
 727         if (!skb) {
 728                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 729                 return;
 730         }
 731         capi_cmsg2message(&iif->hcmsg,
 732                           __skb_put(skb, CAPI_DISCONNECT_B3_IND_BASELEN));
 733         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 734         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 735 }
 736
 737 /**
 738  * gigaset_isdn_connD() - signal D channel connect
 739  * @bcs:        B channel descriptor structure.
 740  *
 741  * Called by main module at tasklet level to notify the LL that the D channel
 742  * connection has been established.
 743  */
 744 void gigaset_isdn_connD(struct bc_state *bcs)
 745 {
 746         struct cardstate *cs = bcs->cs;
 747         struct gigaset_capi_ctr *iif = cs->iif;
 748         struct gigaset_capi_appl *ap = bcs->ap;
 749         struct sk_buff *skb;
 750         unsigned int msgsize;
 751
 752         if (!ap) {
 753                 dev_err(cs->dev, "%s: no application\n", __func__);
 754                 return;
 755         }
 756         while (ap->bcnext) {
 757                 /* this should never happen */
 758                 dev_warn(cs->dev, "%s: dropping extra application %u\n",
 759                          __func__, ap->bcnext->id);
 760                 send_disconnect_ind(bcs, ap->bcnext,
 761                                     CapiCallGivenToOtherApplication);
 762                 ap->bcnext = ap->bcnext->bcnext;
 763         }
 764         if (ap->connected == APCONN_NONE) {
 765                 dev_warn(cs->dev, "%s: application %u not connected\n",
 766                          __func__, ap->id);
 767                 return;
 768         }
 769
 770         /* prepare CONNECT_ACTIVE_IND message
 771          * Note: LLC not supported by device
 772          */
 773         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_CONNECT_ACTIVE, CAPI_IND,
 774                          ap->nextMessageNumber++,
 775                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 776
 777         /* minimum size, all structs empty */
 778         msgsize = CAPI_CONNECT_ACTIVE_IND_BASELEN;
 779
 780         /* ToDo: set parameter: Connected number
 781          * (requires ev-layer state machine extension to collect
 782          * ZCON device reply)
 783          */
 784
 785         /* build and emit CONNECT_ACTIVE_IND message */
 786         skb = alloc_skb(msgsize, GFP_ATOMIC);
 787         if (!skb) {
 788                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 789                 return;
 790         }
 791         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 792         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 793         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 794 }
 795
 796 /**
 797  * gigaset_isdn_hupD() - signal D channel hangup
 798  * @bcs:        B channel descriptor structure.
 799  *
 800  * Called by main module at tasklet level to notify the LL that the D channel
 801  * connection has been shut down.
 802  */
 803 void gigaset_isdn_hupD(struct bc_state *bcs)
 804 {
 805         struct gigaset_capi_appl *ap;
 806
 807         /*
 808          * ToDo: pass on reason code reported by device
 809          * (requires ev-layer state machine extension to collect
 810          * ZCAU device reply)
 811          */
 812         for (ap = bcs->ap; ap != NULL; ap = ap->bcnext) {
 813                 send_disconnect_b3_ind(bcs, ap);
 814                 send_disconnect_ind(bcs, ap, 0);
 815         }
 816         bcs->ap = NULL;
 817 }
 818
 819 /**
 820  * gigaset_isdn_connB() - signal B channel connect
 821  * @bcs:        B channel descriptor structure.
 822  *
 823  * Called by main module at tasklet level to notify the LL that the B channel
 824  * connection has been established.
 825  */
 826 void gigaset_isdn_connB(struct bc_state *bcs)
 827 {
 828         struct cardstate *cs = bcs->cs;
 829         struct gigaset_capi_ctr *iif = cs->iif;
 830         struct gigaset_capi_appl *ap = bcs->ap;
 831         struct sk_buff *skb;
 832         unsigned int msgsize;
 833         u8 command;
 834
 835         if (!ap) {
 836                 dev_err(cs->dev, "%s: no application\n", __func__);
 837                 return;
 838         }
 839         while (ap->bcnext) {
 840                 /* this should never happen */
 841                 dev_warn(cs->dev, "%s: dropping extra application %u\n",
 842                          __func__, ap->bcnext->id);
 843                 send_disconnect_ind(bcs, ap->bcnext,
 844                                     CapiCallGivenToOtherApplication);
 845                 ap->bcnext = ap->bcnext->bcnext;
 846         }
 847         if (!ap->connected) {
 848                 dev_warn(cs->dev, "%s: application %u not connected\n",
 849                          __func__, ap->id);
 850                 return;
 851         }
 852
 853         /*
 854          * emit CONNECT_B3_ACTIVE_IND if we already got CONNECT_B3_REQ;
 855          * otherwise we have to emit CONNECT_B3_IND first, and follow up with
 856          * CONNECT_B3_ACTIVE_IND in reply to CONNECT_B3_RESP
 857          * Parameters in both cases always: NCCI = 1, NCPI empty
 858          */
 859         if (ap->connected >= APCONN_ACTIVE) {
 860                 command = CAPI_CONNECT_B3_ACTIVE;
 861                 msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
 862         } else {
 863                 command = CAPI_CONNECT_B3;
 864                 msgsize = CAPI_CONNECT_B3_IND_BASELEN;
 865         }
 866         capi_cmsg_header(&iif->hcmsg, ap->id, command, CAPI_IND,
 867                          ap->nextMessageNumber++,
 868                          iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
 869         skb = alloc_skb(msgsize, GFP_ATOMIC);
 870         if (!skb) {
 871                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 872                 return;
 873         }
 874         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 875         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 876         ap->connected = APCONN_ACTIVE;
 877         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 878 }
 879
 880 /**
 881  * gigaset_isdn_hupB() - signal B channel hangup
 882  * @bcs:        B channel descriptor structure.
 883  *
 884  * Called by main module to notify the LL that the B channel connection has
 885  * been shut down.
 886  */
 887 void gigaset_isdn_hupB(struct bc_state *bcs)
 888 {
 889         struct cardstate *cs = bcs->cs;
 890         struct gigaset_capi_appl *ap = bcs->ap;
 891
 892         /* ToDo: assure order of DISCONNECT_B3_IND and DISCONNECT_IND ? */
 893
 894         if (!ap) {
 895                 dev_err(cs->dev, "%s: no application\n", __func__);
 896                 return;
 897         }
 898
 899         send_disconnect_b3_ind(bcs, ap);
 900 }
 901
 902 /**
 903  * gigaset_isdn_start() - signal device availability
 904  * @cs:         device descriptor structure.
 905  *
 906  * Called by main module to notify the LL that the device is available for
 907  * use.
 908  */
 909 void gigaset_isdn_start(struct cardstate *cs)
 910 {
 911         struct gigaset_capi_ctr *iif = cs->iif;
 912
 913         /* fill profile data: manufacturer name */
 914         strcpy(iif->ctr.manu, "Siemens");
 915         /* CAPI and device version */
 916         iif->ctr.version.majorversion = 2;              /* CAPI 2.0 */
 917         iif->ctr.version.minorversion = 0;
 918         /* ToDo: check/assert cs->gotfwver? */
 919         iif->ctr.version.majormanuversion = cs->fwver[0];
 920         iif->ctr.version.minormanuversion = cs->fwver[1];
 921         /* number of B channels supported */
 922         iif->ctr.profile.nbchannel = cs->channels;
 923         /* global options: internal controller, supplementary services */
 924         iif->ctr.profile.goptions = 0x11;
 925         /* B1 protocols: 64 kbit/s HDLC or transparent */
 926         iif->ctr.profile.support1 =  0x03;
 927         /* B2 protocols: transparent only */
 928         /* ToDo: X.75 SLP ? */
 929         iif->ctr.profile.support2 =  0x02;
 930         /* B3 protocols: transparent only */
 931         iif->ctr.profile.support3 =  0x01;
 932         /* no serial number */
 933         strcpy(iif->ctr.serial, "0");
 934         capi_ctr_ready(&iif->ctr);
 935 }
 936
 937 /**
 938  * gigaset_isdn_stop() - signal device unavailability
 939  * @cs:         device descriptor structure.
 940  *
 941  * Called by main module to notify the LL that the device is no longer
 942  * available for use.
 943  */
 944 void gigaset_isdn_stop(struct cardstate *cs)
 945 {
 946         struct gigaset_capi_ctr *iif = cs->iif;
 947         capi_ctr_down(&iif->ctr);
 948 }
 949
 950 /*
 951  * kernel CAPI callback methods
 952  * ============================
 953  */
 954
 955 /*
 956  * load firmware
 957  */
 958 static int gigaset_load_firmware(struct capi_ctr *ctr, capiloaddata *data)
 959 {
 960         struct cardstate *cs = ctr->driverdata;
 961
 962         /* AVM specific operation, not needed for Gigaset -- ignore */
 963         dev_notice(cs->dev, "load_firmware ignored\n");
 964
 965         return 0;
 966 }
 967
 968 /*
 969  * reset (deactivate) controller
 970  */
 971 static void gigaset_reset_ctr(struct capi_ctr *ctr)
 972 {
 973         struct cardstate *cs = ctr->driverdata;
 974
 975         /* AVM specific operation, not needed for Gigaset -- ignore */
 976         dev_notice(cs->dev, "reset_ctr ignored\n");
 977 }
 978
 979 /*
 980  * register CAPI application
 981  */
 982 static void gigaset_register_appl(struct capi_ctr *ctr, u16 appl,
 983                            capi_register_params *rp)
 984 {
 985         struct gigaset_capi_ctr *iif
 986                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
 987         struct cardstate *cs = ctr->driverdata;
 988         struct gigaset_capi_appl *ap;
 989
 990         list_for_each_entry(ap, &iif->appls, ctrlist)
 991                 if (ap->id == appl) {
 992                         dev_notice(cs->dev,
 993                                    "application %u already registered\n", appl);
 994                         return;
 995                 }
 996
 997         ap = kzalloc(sizeof(*ap), GFP_KERNEL);
 998         if (!ap) {
 999                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1000                 return;
1001         }
1002         ap->id = appl;
1003
1004         list_add(&ap->ctrlist, &iif->appls);
1005 }
1006
1007 /*
1008  * release CAPI application
1009  */
1010 static void gigaset_release_appl(struct capi_ctr *ctr, u16 appl)
1011 {
1012         struct gigaset_capi_ctr *iif
1013                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
1014         struct cardstate *cs = iif->ctr.driverdata;
1015         struct gigaset_capi_appl *ap, *tmp;
1016
1017         list_for_each_entry_safe(ap, tmp, &iif->appls, ctrlist)
1018                 if (ap->id == appl) {
1019                         if (ap->connected != APCONN_NONE) {
1020                                 dev_err(cs->dev,
1021                                         "%s: application %u still connected\n",
1022                                         __func__, ap->id);
1023                                 /* ToDo: clear active connection */
1024                         }
1025                         list_del(&ap->ctrlist);
1026                         kfree(ap);
1027                 }
1028
1029 }
1030
1031 /*
1032  * =====================================================================
1033  * outgoing CAPI message handler
1034  * =====================================================================
1035  */
1036
1037 /*
1038  * helper function: emit reply message with given Info value
1039  */
1040 static void send_conf(struct gigaset_capi_ctr *iif,
1041                       struct gigaset_capi_appl *ap,
1042                       struct sk_buff *skb,
1043                       u16 info)
1044 {
1045         /*
1046          * _CONF replies always only have NCCI and Info parameters
1047          * so they'll fit into the _REQ message skb
1048          */
1049         capi_cmsg_answer(&iif->acmsg);
1050         iif->acmsg.Info = info;
1051         capi_cmsg2message(&iif->acmsg, skb->data);
1052         __skb_trim(skb, CAPI_STDCONF_LEN);
1053         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1054         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
1055 }
1056
1057 /*
1058  * process FACILITY_REQ message
1059  */
1060 static void do_facility_req(struct gigaset_capi_ctr *iif,
1061                             struct gigaset_capi_appl *ap,
1062                             struct sk_buff *skb)
1063 {
1064         struct cardstate *cs = iif->ctr.driverdata;
1065         struct sk_buff *cskb;
1066         u8 *pparam;
1067         unsigned int msgsize = CAPI_FACILITY_CONF_BASELEN;
1068         u16 function, info;
1069         static u8 confparam[10];        /* max. 9 octets + length byte */
1070
1071         /* decode message */
1072         capi_message2cmsg(&iif->acmsg, skb->data);
1073         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1074
1075         /*
1076          * Facility Request Parameter is not decoded by capi_message2cmsg()
1077          * encoding depends on Facility Selector
1078          */
1079         switch (iif->acmsg.FacilitySelector) {
1080         case CAPI_FACILITY_DTMF:        /* ToDo */
1081                 info = CapiFacilityNotSupported;
1082                 confparam[0] = 2;       /* length */
1083                 /* DTMF information: Unknown DTMF request */
1084                 capimsg_setu16(confparam, 1, 2);
1085                 break;
1086
1087         case CAPI_FACILITY_V42BIS:      /* not supported */
1088                 info = CapiFacilityNotSupported;
1089                 confparam[0] = 2;       /* length */
1090                 /* V.42 bis information: not available */
1091                 capimsg_setu16(confparam, 1, 1);
1092                 break;
1093
1094         case CAPI_FACILITY_SUPPSVC:
1095                 /* decode Function parameter */
1096                 pparam = iif->acmsg.FacilityRequestParameter;
1097                 if (pparam == NULL || *pparam < 2) {
1098                         dev_notice(cs->dev, "%s: %s missing\n", "FACILITY_REQ",
1099                                    "Facility Request Parameter");
1100                         send_conf(iif, ap, skb, CapiIllMessageParmCoding);
1101                         return;
1102                 }
1103                 function = CAPIMSG_U16(pparam, 1);
1104                 switch (function) {
1105                 case CAPI_SUPPSVC_GETSUPPORTED:
1106                         info = CapiSuccess;
1107                         /* Supplementary Service specific parameter */
1108                         confparam[3] = 6;       /* length */
1109                         /* Supplementary services info: Success */
1110                         capimsg_setu16(confparam, 4, CapiSuccess);
1111                         /* Supported Services: none */
1112                         capimsg_setu32(confparam, 6, 0);
1113                         break;
1114                 /* ToDo: add supported services */
1115                 default:
1116                         info = CapiFacilitySpecificFunctionNotSupported;
1117                         /* Supplementary Service specific parameter */
1118                         confparam[3] = 2;       /* length */
1119                         /* Supplementary services info: not supported */
1120                         capimsg_setu16(confparam, 4,
1121                                        CapiSupplementaryServiceNotSupported);
1122                 }
1123
1124                 /* Facility confirmation parameter */
1125                 confparam[0] = confparam[3] + 3;        /* total length */
1126                 /* Function: copy from _REQ message */
1127                 capimsg_setu16(confparam, 1, function);
1128                 /* Supplementary Service specific parameter already set above */
1129                 break;
1130
1131         case CAPI_FACILITY_WAKEUP:      /* ToDo */
1132                 info = CapiFacilityNotSupported;
1133                 confparam[0] = 2;       /* length */
1134                 /* Number of accepted awake request parameters: 0 */
1135                 capimsg_setu16(confparam, 1, 0);
1136                 break;
1137
1138         default:
1139                 info = CapiFacilityNotSupported;
1140                 confparam[0] = 0;       /* empty struct */
1141         }
1142
1143         /* send FACILITY_CONF with given Info and confirmation parameter */
1144         capi_cmsg_answer(&iif->acmsg);
1145         iif->acmsg.Info = info;
1146         iif->acmsg.FacilityConfirmationParameter = confparam;
1147         msgsize += confparam[0];        /* length */
1148         cskb = alloc_skb(msgsize, GFP_ATOMIC);
1149         if (!cskb) {
1150                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1151                 return;
1152         }
1153         capi_cmsg2message(&iif->acmsg, __skb_put(cskb, msgsize));
1154         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1155                 capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
1156 }
1157
1158
1159 /*
1160  * process LISTEN_REQ message
1161  * just store the masks in the application data structure
1162  */
1163 static void do_listen_req(struct gigaset_capi_ctr *iif,
1164                           struct gigaset_capi_appl *ap,
1165                           struct sk_buff *skb)
1166 {
1167         /* decode message */
1168         capi_message2cmsg(&iif->acmsg, skb->data);
1169         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1170
1171         /* store listening parameters */
1172         ap->listenInfoMask = iif->acmsg.InfoMask;
1173         ap->listenCIPmask = iif->acmsg.CIPmask;
1174         send_conf(iif, ap, skb, CapiSuccess);
1175 }
1176
1177 /*
1178  * process ALERT_REQ message
1179  * nothing to do, Gigaset always alerts anyway
1180  */
1181 static void do_alert_req(struct gigaset_capi_ctr *iif,
1182                          struct gigaset_capi_appl *ap,
1183                          struct sk_buff *skb)
1184 {
1185         /* decode message */
1186         capi_message2cmsg(&iif->acmsg, skb->data);
1187         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1188         send_conf(iif, ap, skb, CapiAlertAlreadySent);
1189 }
1190
1191 /*
1192  * process CONNECT_REQ message
1193  * allocate a B channel, prepare dial commands, queue a DIAL event,
1194  * emit CONNECT_CONF reply
1195  */
1196 static void do_connect_req(struct gigaset_capi_ctr *iif,
1197                            struct gigaset_capi_appl *ap,
1198                            struct sk_buff *skb)
1199 {
1200         struct cardstate *cs = iif->ctr.driverdata;
1201         _cmsg *cmsg = &iif->acmsg;
1202         struct bc_state *bcs;
1203         char **commands;
1204         char *s;
1205         u8 *pp;
1206         int i, l;
1207         u16 info;
1208
1209         /* decode message */
1210         capi_message2cmsg(&iif->acmsg, skb->data);
1211         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1212
1213         /* get free B channel & construct PLCI */
1214         bcs = gigaset_get_free_channel(cs);
1215         if (!bcs) {
1216                 dev_notice(cs->dev, "%s: no B channel available\n",
1217                            "CONNECT_REQ");
1218                 send_conf(iif, ap, skb, CapiNoPlciAvailable);
1219                 return;
1220         }
1221         ap->bcnext = NULL;
1222         bcs->ap = ap;
1223         cmsg->adr.adrPLCI |= (bcs->channel + 1) << 8;
1224
1225         /* build command table */
1226         commands = kzalloc(AT_NUM*(sizeof *commands), GFP_KERNEL);
1227         if (!commands)
1228                 goto oom;
1229
1230         /* encode parameter: Called party number */
1231         pp = cmsg->CalledPartyNumber;
1232         if (pp == NULL || *pp == 0) {
1233                 dev_notice(cs->dev, "%s: %s missing\n",
1234                            "CONNECT_REQ", "Called party number");
1235                 info = CapiIllMessageParmCoding;
1236                 goto error;
1237         }
1238         l = *pp++;
1239         /* check type of number/numbering plan byte */
1240         switch (*pp) {
1241         case 0x80:      /* unknown type / unknown numbering plan */
1242         case 0x81:      /* unknown type / ISDN/Telephony numbering plan */
1243                 break;
1244         default:        /* others: warn about potential misinterpretation */
1245                 dev_notice(cs->dev, "%s: %s type/plan 0x%02x unsupported\n",
1246                            "CONNECT_REQ", "Called party number", *pp);
1247         }
1248         pp++;
1249         l--;
1250         /* translate "**" internal call prefix to CTP value */
1251         if (l >= 2 && pp[0] == '*' && pp[1] == '*') {
1252                 s = "^SCTP=0\r";
1253                 pp += 2;
1254                 l -= 2;
1255         } else {
1256                 s = "^SCTP=1\r";
1257         }
1258         commands[AT_TYPE] = kstrdup(s, GFP_KERNEL);
1259         if (!commands[AT_TYPE])
1260                 goto oom;
1261         commands[AT_DIAL] = kmalloc(l+3, GFP_KERNEL);
1262         if (!commands[AT_DIAL])
1263                 goto oom;
1264         snprintf(commands[AT_DIAL], l+3, "D%*s\r", l, pp);
1265
1266         /* encode parameter: Calling party number */
1267         pp = cmsg->CallingPartyNumber;
1268         if (pp != NULL && *pp > 0) {
1269                 l = *pp++;
1270
1271                 /* check type of number/numbering plan byte */
1272                 /* ToDo: allow for/handle Ext=1? */
1273                 switch (*pp) {
1274                 case 0x00:      /* unknown type / unknown numbering plan */
1275                 case 0x01:      /* unknown type / ISDN/Telephony num. plan */
1276                         break;
1277                 default:
1278                         dev_notice(cs->dev,
1279                                    "%s: %s type/plan 0x%02x unsupported\n",
1280                                    "CONNECT_REQ", "Calling party number", *pp);
1281                 }
1282                 pp++;
1283                 l--;
1284
1285                 /* check presentation indicator */
1286                 if (!l) {
1287                         dev_notice(cs->dev, "%s: %s IE truncated\n",
1288                                    "CONNECT_REQ", "Calling party number");
1289                         info = CapiIllMessageParmCoding;
1290                         goto error;
1291                 }
1292                 switch (*pp & 0xfc) { /* ignore Screening indicator */
1293                 case 0x80:      /* Presentation allowed */
1294                         s = "^SCLIP=1\r";
1295                         break;
1296                 case 0xa0:      /* Presentation restricted */
1297                         s = "^SCLIP=0\r";
1298                         break;
1299                 default:
1300                         dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1301                                    "CONNECT_REQ",
1302                                    "Presentation/Screening indicator",
1303                                    *pp);
1304                         s = "^SCLIP=1\r";
1305                 }
1306                 commands[AT_CLIP] = kstrdup(s, GFP_KERNEL);
1307                 if (!commands[AT_CLIP])
1308                         goto oom;
1309                 pp++;
1310                 l--;
1311
1312                 if (l) {
1313                         /* number */
1314                         commands[AT_MSN] = kmalloc(l+8, GFP_KERNEL);
1315                         if (!commands[AT_MSN])
1316                                 goto oom;
1317                         snprintf(commands[AT_MSN], l+8, "^SMSN=%*s\r", l, pp);
1318                 }
1319         }
1320
1321         /* check parameter: CIP Value */
1322         if (cmsg->CIPValue > ARRAY_SIZE(cip2bchlc) ||
1323             (cmsg->CIPValue > 0 && cip2bchlc[cmsg->CIPValue].bc == NULL)) {
1324                 dev_notice(cs->dev, "%s: unknown CIP value %d\n",
1325                            "CONNECT_REQ", cmsg->CIPValue);
1326                 info = CapiCipValueUnknown;
1327                 goto error;
1328         }
1329
1330         /* check/encode parameter: BC */
1331         if (cmsg->BC && cmsg->BC[0]) {
1332                 /* explicit BC overrides CIP */
1333                 l = 2*cmsg->BC[0] + 7;
1334                 commands[AT_BC] = kmalloc(l, GFP_KERNEL);
1335                 if (!commands[AT_BC])
1336                         goto oom;
1337                 strcpy(commands[AT_BC], "^SBC=");
1338                 decode_ie(cmsg->BC, commands[AT_BC]+5);
1339                 strcpy(commands[AT_BC] + l - 2, "\r");
1340         } else if (cip2bchlc[cmsg->CIPValue].bc) {
1341                 l = strlen(cip2bchlc[cmsg->CIPValue].bc) + 7;
1342                 commands[AT_BC] = kmalloc(l, GFP_KERNEL);
1343                 if (!commands[AT_BC])
1344                         goto oom;
1345                 snprintf(commands[AT_BC], l, "^SBC=%s\r",
1346                          cip2bchlc[cmsg->CIPValue].bc);
1347         }
1348
1349         /* check/encode parameter: HLC */
1350         if (cmsg->HLC && cmsg->HLC[0]) {
1351                 /* explicit HLC overrides CIP */
1352                 l = 2*cmsg->HLC[0] + 7;
1353                 commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
1354                 if (!commands[AT_HLC])
1355                         goto oom;
1356                 strcpy(commands[AT_HLC], "^SHLC=");
1357                 decode_ie(cmsg->HLC, commands[AT_HLC]+5);
1358                 strcpy(commands[AT_HLC] + l - 2, "\r");
1359         } else if (cip2bchlc[cmsg->CIPValue].hlc) {
1360                 l = strlen(cip2bchlc[cmsg->CIPValue].hlc) + 7;
1361                 commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
1362                 if (!commands[AT_HLC])
1363                         goto oom;
1364                 snprintf(commands[AT_HLC], l, "^SHLC=%s\r",
1365                          cip2bchlc[cmsg->CIPValue].hlc);
1366         }
1367
1368         /* check/encode parameter: B Protocol */
1369         if (cmsg->BProtocol == CAPI_DEFAULT) {
1370                 bcs->proto2 = L2_HDLC;
1371                 dev_warn(cs->dev,
1372                     "B2 Protocol X.75 SLP unsupported, using Transparent\n");
1373         } else {
1374                 switch (cmsg->B1protocol) {
1375                 case 0:
1376                         bcs->proto2 = L2_HDLC;
1377                         break;
1378                 case 1:
1379                         bcs->proto2 = L2_BITSYNC;
1380                         break;
1381                 default:
1382                         dev_warn(cs->dev,
1383                             "B1 Protocol %u unsupported, using Transparent\n",
1384                                  cmsg->B1protocol);
1385                         bcs->proto2 = L2_BITSYNC;
1386                 }
1387                 if (cmsg->B2protocol != 1)
1388                         dev_warn(cs->dev,
1389                             "B2 Protocol %u unsupported, using Transparent\n",
1390                                  cmsg->B2protocol);
1391                 if (cmsg->B3protocol != 0)
1392                         dev_warn(cs->dev,
1393                             "B3 Protocol %u unsupported, using Transparent\n",
1394                                  cmsg->B3protocol);
1395                 ignore_cstruct_param(cs, cmsg->B1configuration,
1396                                         "CONNECT_REQ", "B1 Configuration");
1397                 ignore_cstruct_param(cs, cmsg->B2configuration,
1398                                         "CONNECT_REQ", "B2 Configuration");
1399                 ignore_cstruct_param(cs, cmsg->B3configuration,
1400                                         "CONNECT_REQ", "B3 Configuration");
1401         }
1402         commands[AT_PROTO] = kmalloc(9, GFP_KERNEL);
1403         if (!commands[AT_PROTO])
1404                 goto oom;
1405         snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
1406
1407         /* ToDo: check/encode remaining parameters */
1408         ignore_cstruct_param(cs, cmsg->CalledPartySubaddress,
1409                                         "CONNECT_REQ", "Called pty subaddr");
1410         ignore_cstruct_param(cs, cmsg->CallingPartySubaddress,
1411                                         "CONNECT_REQ", "Calling pty subaddr");
1412         ignore_cstruct_param(cs, cmsg->LLC,
1413                                         "CONNECT_REQ", "LLC");
1414         ignore_cmstruct_param(cs, cmsg->AdditionalInfo,
1415                                         "CONNECT_REQ", "Additional Info");
1416
1417         /* encode parameter: B channel to use */
1418         commands[AT_ISO] = kmalloc(9, GFP_KERNEL);
1419         if (!commands[AT_ISO])
1420                 goto oom;
1421         snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
1422                  (unsigned) bcs->channel + 1);
1423
1424         /* queue & schedule EV_DIAL event */
1425         if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
1426                                bcs->at_state.seq_index, NULL))
1427                 goto oom;
1428         gig_dbg(DEBUG_CMD, "scheduling DIAL");
1429         gigaset_schedule_event(cs);
1430         ap->connected = APCONN_SETUP;
1431         send_conf(iif, ap, skb, CapiSuccess);
1432         return;
1433
1434 oom:
1435         dev_err(cs->dev, "%s: out of memory\n", __func__);
1436         info = CAPI_MSGOSRESOURCEERR;
1437 error:
1438         if (commands)
1439                 for (i = 0; i < AT_NUM; i++)
1440                         kfree(commands[i]);
1441         kfree(commands);
1442         gigaset_free_channel(bcs);
1443         send_conf(iif, ap, skb, info);
1444 }
1445
1446 /*
1447  * process CONNECT_RESP message
1448  * checks protocol parameters and queues an ACCEPT or HUP event
1449  */
1450 static void do_connect_resp(struct gigaset_capi_ctr *iif,
1451                             struct gigaset_capi_appl *ap,
1452                             struct sk_buff *skb)
1453 {
1454         struct cardstate *cs = iif->ctr.driverdata;
1455         _cmsg *cmsg = &iif->acmsg;
1456         struct bc_state *bcs;
1457         struct gigaset_capi_appl *oap;
1458         int channel;
1459
1460         /* decode message */
1461         capi_message2cmsg(&iif->acmsg, skb->data);
1462         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1463         dev_kfree_skb(skb);
1464
1465         /* extract and check channel number from PLCI */
1466         channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
1467         if (!channel || channel > cs->channels) {
1468                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1469                            "CONNECT_RESP", "PLCI", cmsg->adr.adrPLCI);
1470                 return;
1471         }
1472         bcs = cs->bcs + channel - 1;
1473
1474         switch (cmsg->Reject) {
1475         case 0:         /* Accept */
1476                 /* drop all competing applications, keep only this one */
1477                 for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
1478                         if (oap != ap)
1479                                 send_disconnect_ind(bcs, oap,
1480                                         CapiCallGivenToOtherApplication);
1481                 ap->bcnext = NULL;
1482                 bcs->ap = ap;
1483                 bcs->chstate |= CHS_NOTIFY_LL;
1484
1485                 /* check/encode B channel protocol */
1486                 if (cmsg->BProtocol == CAPI_DEFAULT) {
1487                         bcs->proto2 = L2_HDLC;
1488                         dev_warn(cs->dev,
1489                 "B2 Protocol X.75 SLP unsupported, using Transparent\n");
1490                 } else {
1491                         switch (cmsg->B1protocol) {
1492                         case 0:
1493                                 bcs->proto2 = L2_HDLC;
1494                                 break;
1495                         case 1:
1496                                 bcs->proto2 = L2_BITSYNC;
1497                                 break;
1498                         default:
1499                                 dev_warn(cs->dev,
1500                         "B1 Protocol %u unsupported, using Transparent\n",
1501                                          cmsg->B1protocol);
1502                                 bcs->proto2 = L2_BITSYNC;
1503                         }
1504                         if (cmsg->B2protocol != 1)
1505                                 dev_warn(cs->dev,
1506                         "B2 Protocol %u unsupported, using Transparent\n",
1507                                          cmsg->B2protocol);
1508                         if (cmsg->B3protocol != 0)
1509                                 dev_warn(cs->dev,
1510                         "B3 Protocol %u unsupported, using Transparent\n",
1511                                          cmsg->B3protocol);
1512                         ignore_cstruct_param(cs, cmsg->B1configuration,
1513                                         "CONNECT_RESP", "B1 Configuration");
1514                         ignore_cstruct_param(cs, cmsg->B2configuration,
1515                                         "CONNECT_RESP", "B2 Configuration");
1516                         ignore_cstruct_param(cs, cmsg->B3configuration,
1517                                         "CONNECT_RESP", "B3 Configuration");
1518                 }
1519
1520                 /* ToDo: check/encode remaining parameters */
1521                 ignore_cstruct_param(cs, cmsg->ConnectedNumber,
1522                                         "CONNECT_RESP", "Connected Number");
1523                 ignore_cstruct_param(cs, cmsg->ConnectedSubaddress,
1524                                         "CONNECT_RESP", "Connected Subaddress");
1525                 ignore_cstruct_param(cs, cmsg->LLC,
1526                                         "CONNECT_RESP", "LLC");
1527                 ignore_cmstruct_param(cs, cmsg->AdditionalInfo,
1528                                         "CONNECT_RESP", "Additional Info");
1529
1530                 /* Accept call */
1531                 if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
1532                                        EV_ACCEPT, NULL, 0, NULL))
1533                         return;
1534                 gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
1535                 gigaset_schedule_event(cs);
1536                 return;
1537
1538         case 1:                 /* Ignore */
1539                 /* send DISCONNECT_IND to this application */
1540                 send_disconnect_ind(bcs, ap, 0);
1541
1542                 /* remove it from the list of listening apps */
1543                 if (bcs->ap == ap) {
1544                         bcs->ap = ap->bcnext;
1545                         if (bcs->ap == NULL)
1546                                 /* last one: stop ev-layer hupD notifications */
1547                                 bcs->chstate &= ~CHS_NOTIFY_LL;
1548                         return;
1549                 }
1550                 for (oap = bcs->ap; oap != NULL; oap = oap->bcnext) {
1551                         if (oap->bcnext == ap) {
1552                                 oap->bcnext = oap->bcnext->bcnext;
1553                                 return;
1554                         }
1555                 }
1556                 dev_err(cs->dev, "%s: application %u not found\n",
1557                         __func__, ap->id);
1558                 return;
1559
1560         default:                /* Reject */
1561                 /* drop all competing applications, keep only this one */
1562                 for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
1563                         if (oap != ap)
1564                                 send_disconnect_ind(bcs, oap,
1565                                         CapiCallGivenToOtherApplication);
1566                 ap->bcnext = NULL;
1567                 bcs->ap = ap;
1568
1569                 /* reject call - will trigger DISCONNECT_IND for this app */
1570                 dev_info(cs->dev, "%s: Reject=%x\n",
1571                          "CONNECT_RESP", cmsg->Reject);
1572                 if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
1573                                        EV_HUP, NULL, 0, NULL))
1574                         return;
1575                 gig_dbg(DEBUG_CMD, "scheduling HUP");
1576                 gigaset_schedule_event(cs);
1577                 return;
1578         }
1579 }
1580
1581 /*
1582  * process CONNECT_B3_REQ message
1583  * build NCCI and emit CONNECT_B3_CONF reply
1584  */
1585 static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
1586                               struct gigaset_capi_appl *ap,
1587                               struct sk_buff *skb)
1588 {
1589         struct cardstate *cs = iif->ctr.driverdata;
1590         int channel;
1591
1592         /* decode message */
1593         capi_message2cmsg(&iif->acmsg, skb->data);
1594         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1595
1596         /* extract and check channel number from PLCI */
1597         channel = (iif->acmsg.adr.adrPLCI >> 8) & 0xff;
1598         if (!channel || channel > cs->channels) {
1599                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1600                            "CONNECT_B3_REQ", "PLCI", iif->acmsg.adr.adrPLCI);
1601                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1602                 return;
1603         }
1604
1605         /* mark logical connection active */
1606         ap->connected = APCONN_ACTIVE;
1607
1608         /* build NCCI: always 1 (one B3 connection only) */
1609         iif->acmsg.adr.adrNCCI |= 1 << 16;
1610
1611         /* NCPI parameter: not applicable for B3 Transparent */
1612         ignore_cstruct_param(cs, iif->acmsg.NCPI,
1613                                 "CONNECT_B3_REQ", "NCPI");
1614         send_conf(iif, ap, skb,
1615                   (iif->acmsg.NCPI && iif->acmsg.NCPI[0]) ?
1616                         CapiNcpiNotSupportedByProtocol : CapiSuccess);
1617 }
1618
1619 /*
1620  * process CONNECT_B3_RESP message
1621  * Depending on the Reject parameter, either emit CONNECT_B3_ACTIVE_IND
1622  * or queue EV_HUP and emit DISCONNECT_B3_IND.
1623  * The emitted message is always shorter than the received one,
1624  * allowing to reuse the skb.
1625  */
1626 static void do_connect_b3_resp(struct gigaset_capi_ctr *iif,
1627                                struct gigaset_capi_appl *ap,
1628                                struct sk_buff *skb)
1629 {
1630         struct cardstate *cs = iif->ctr.driverdata;
1631         struct bc_state *bcs = NULL;
1632         int channel;
1633         unsigned int msgsize;
1634         u8 command;
1635
1636         /* decode message */
1637         capi_message2cmsg(&iif->acmsg, skb->data);
1638         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1639
1640         /* extract and check channel number and NCCI */
1641         channel = (iif->acmsg.adr.adrNCCI >> 8) & 0xff;
1642         if (!channel || channel > cs->channels ||
1643             ((iif->acmsg.adr.adrNCCI >> 16) & 0xffff) != 1) {
1644                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1645                            "CONNECT_B3_RESP", "NCCI", iif->acmsg.adr.adrNCCI);
1646                 dev_kfree_skb(skb);
1647                 return;
1648         }
1649         bcs = &cs->bcs[channel-1];
1650
1651         if (iif->acmsg.Reject) {
1652                 /* Reject: clear B3 connect received flag */
1653                 ap->connected = APCONN_SETUP;
1654
1655                 /* trigger hangup, causing eventual DISCONNECT_IND */
1656                 if (!gigaset_add_event(cs, &bcs->at_state,
1657                                        EV_HUP, NULL, 0, NULL)) {
1658                         dev_err(cs->dev, "%s: out of memory\n", __func__);
1659                         dev_kfree_skb(skb);
1660                         return;
1661                 }
1662                 gig_dbg(DEBUG_CMD, "scheduling HUP");
1663                 gigaset_schedule_event(cs);
1664
1665                 /* emit DISCONNECT_B3_IND */
1666                 command = CAPI_DISCONNECT_B3;
1667                 msgsize = CAPI_DISCONNECT_B3_IND_BASELEN;
1668         } else {
1669                 /*
1670                  * Accept: emit CONNECT_B3_ACTIVE_IND immediately, as
1671                  * we only send CONNECT_B3_IND if the B channel is up
1672                  */
1673                 command = CAPI_CONNECT_B3_ACTIVE;
1674                 msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
1675         }
1676         capi_cmsg_header(&iif->acmsg, ap->id, command, CAPI_IND,
1677                          ap->nextMessageNumber++, iif->acmsg.adr.adrNCCI);
1678         __skb_trim(skb, msgsize);
1679         capi_cmsg2message(&iif->acmsg, skb->data);
1680         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1681         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
1682 }
1683
1684 /*
1685  * process DISCONNECT_REQ message
1686  * schedule EV_HUP and emit DISCONNECT_B3_IND if necessary,
1687  * emit DISCONNECT_CONF reply
1688  */
1689 static void do_disconnect_req(struct gigaset_capi_ctr *iif,
1690                               struct gigaset_capi_appl *ap,
1691                               struct sk_buff *skb)
1692 {
1693         struct cardstate *cs = iif->ctr.driverdata;
1694         struct bc_state *bcs;
1695         _cmsg *b3cmsg;
1696         struct sk_buff *b3skb;
1697         int channel;
1698
1699         /* decode message */
1700         capi_message2cmsg(&iif->acmsg, skb->data);
1701         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1702
1703         /* extract and check channel number from PLCI */
1704         channel = (iif->acmsg.adr.adrPLCI >> 8) & 0xff;
1705         if (!channel || channel > cs->channels) {
1706                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1707                            "DISCONNECT_REQ", "PLCI", iif->acmsg.adr.adrPLCI);
1708                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1709                 return;
1710         }
1711         bcs = cs->bcs + channel - 1;
1712
1713         /* ToDo: process parameter: Additional info */
1714         ignore_cmstruct_param(cs, iif->acmsg.AdditionalInfo,
1715                               "DISCONNECT_REQ", "Additional Info");
1716
1717         /* skip if DISCONNECT_IND already sent */
1718         if (!ap->connected)
1719                 return;
1720
1721         /* check for active logical connection */
1722         if (ap->connected >= APCONN_ACTIVE) {
1723                 /*
1724                  * emit DISCONNECT_B3_IND with cause 0x3301
1725                  * use separate cmsg structure, as the content of iif->acmsg
1726                  * is still needed for creating the _CONF message
1727                  */
1728                 b3cmsg = kmalloc(sizeof(*b3cmsg), GFP_KERNEL);
1729                 if (!b3cmsg) {
1730                         dev_err(cs->dev, "%s: out of memory\n", __func__);
1731                         send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1732                         return;
1733                 }
1734                 capi_cmsg_header(b3cmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
1735                                  ap->nextMessageNumber++,
1736                                  iif->acmsg.adr.adrPLCI | (1 << 16));
1737                 b3cmsg->Reason_B3 = CapiProtocolErrorLayer1;
1738                 b3skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_KERNEL);
1739                 if (b3skb == NULL) {
1740                         dev_err(cs->dev, "%s: out of memory\n", __func__);
1741                         send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1742                         return;
1743                 }
1744                 capi_cmsg2message(b3cmsg,
1745                         __skb_put(b3skb, CAPI_DISCONNECT_B3_IND_BASELEN));
1746                 kfree(b3cmsg);
1747                 capi_ctr_handle_message(&iif->ctr, ap->id, b3skb);
1748         }
1749
1750         /* trigger hangup, causing eventual DISCONNECT_IND */
1751         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
1752                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1753                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1754                 return;
1755         }
1756         gig_dbg(DEBUG_CMD, "scheduling HUP");
1757         gigaset_schedule_event(cs);
1758
1759         /* emit reply */
1760         send_conf(iif, ap, skb, CapiSuccess);
1761 }
1762
1763 /*
1764  * process DISCONNECT_B3_REQ message
1765  * schedule EV_HUP and emit DISCONNECT_B3_CONF reply
1766  */
1767 static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
1768                                  struct gigaset_capi_appl *ap,
1769                                  struct sk_buff *skb)
1770 {
1771         struct cardstate *cs = iif->ctr.driverdata;
1772         int channel;
1773
1774         /* decode message */
1775         capi_message2cmsg(&iif->acmsg, skb->data);
1776         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1777
1778         /* extract and check channel number and NCCI */
1779         channel = (iif->acmsg.adr.adrNCCI >> 8) & 0xff;
1780         if (!channel || channel > cs->channels ||
1781             ((iif->acmsg.adr.adrNCCI >> 16) & 0xffff) != 1) {
1782                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1783                            "DISCONNECT_B3_REQ", "NCCI", iif->acmsg.adr.adrNCCI);
1784                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1785                 return;
1786         }
1787
1788         /* reject if logical connection not active */
1789         if (ap->connected < APCONN_ACTIVE) {
1790                 send_conf(iif, ap, skb,
1791                           CapiMessageNotSupportedInCurrentState);
1792                 return;
1793         }
1794
1795         /* trigger hangup, causing eventual DISCONNECT_B3_IND */
1796         if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
1797                                EV_HUP, NULL, 0, NULL)) {
1798                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1799                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1800                 return;
1801         }
1802         gig_dbg(DEBUG_CMD, "scheduling HUP");
1803         gigaset_schedule_event(cs);
1804
1805         /* NCPI parameter: not applicable for B3 Transparent */
1806         ignore_cstruct_param(cs, iif->acmsg.NCPI,
1807                                 "DISCONNECT_B3_REQ", "NCPI");
1808         send_conf(iif, ap, skb,
1809                   (iif->acmsg.NCPI && iif->acmsg.NCPI[0]) ?
1810                         CapiNcpiNotSupportedByProtocol : CapiSuccess);
1811 }
1812
1813 /*
1814  * process DATA_B3_REQ message
1815  */
1816 static void do_data_b3_req(struct gigaset_capi_ctr *iif,
1817                            struct gigaset_capi_appl *ap,
1818                            struct sk_buff *skb)
1819 {
1820         struct cardstate *cs = iif->ctr.driverdata;
1821         int channel = CAPIMSG_PLCI_PART(skb->data);
1822         u16 ncci = CAPIMSG_NCCI_PART(skb->data);
1823         u16 msglen = CAPIMSG_LEN(skb->data);
1824         u16 datalen = CAPIMSG_DATALEN(skb->data);
1825         u16 flags = CAPIMSG_FLAGS(skb->data);
1826
1827         /* frequent message, avoid _cmsg overhead */
1828         dump_rawmsg(DEBUG_LLDATA, "DATA_B3_REQ", skb->data);
1829
1830         gig_dbg(DEBUG_LLDATA,
1831                 "Receiving data from LL (ch: %d, flg: %x, sz: %d|%d)",
1832                 channel, flags, msglen, datalen);
1833
1834         /* check parameters */
1835         if (channel == 0 || channel > cs->channels || ncci != 1) {
1836                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1837                            "DATA_B3_REQ", "NCCI", CAPIMSG_NCCI(skb->data));
1838                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1839                 return;
1840         }
1841         if (msglen != CAPI_DATA_B3_REQ_LEN && msglen != CAPI_DATA_B3_REQ_LEN64)
1842                 dev_notice(cs->dev, "%s: unexpected length %d\n",
1843                            "DATA_B3_REQ", msglen);
1844         if (msglen + datalen != skb->len)
1845                 dev_notice(cs->dev, "%s: length mismatch (%d+%d!=%d)\n",
1846                            "DATA_B3_REQ", msglen, datalen, skb->len);
1847         if (msglen + datalen > skb->len) {
1848                 /* message too short for announced data length */
1849                 send_conf(iif, ap, skb, CapiIllMessageParmCoding); /* ? */
1850                 return;
1851         }
1852         if (flags & CAPI_FLAGS_RESERVED) {
1853                 dev_notice(cs->dev, "%s: reserved flags set (%x)\n",
1854                            "DATA_B3_REQ", flags);
1855                 send_conf(iif, ap, skb, CapiIllMessageParmCoding);
1856                 return;
1857         }
1858
1859         /* reject if logical connection not active */
1860         if (ap->connected < APCONN_ACTIVE) {
1861                 send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
1862                 return;
1863         }
1864
1865         /*
1866          * pull CAPI message from skb,
1867          * pass payload data to device-specific module
1868          * CAPI message will be preserved in headroom
1869          */
1870         skb_pull(skb, msglen);
1871         if (cs->ops->send_skb(&cs->bcs[channel-1], skb) < 0) {
1872                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1873                 return;
1874         }
1875
1876         /* DATA_B3_CONF reply will be sent by gigaset_skb_sent() */
1877
1878         /*
1879          * ToDo: honor unset "delivery confirmation" bit
1880          * (send DATA_B3_CONF immediately?)
1881          */
1882 }
1883
1884 /*
1885  * process RESET_B3_REQ message
1886  * just always reply "not supported by current protocol"
1887  */
1888 static void do_reset_b3_req(struct gigaset_capi_ctr *iif,
1889                             struct gigaset_capi_appl *ap,
1890                             struct sk_buff *skb)
1891 {
1892         /* decode message */
1893         capi_message2cmsg(&iif->acmsg, skb->data);
1894         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1895         send_conf(iif, ap, skb,
1896                   CapiResetProcedureNotSupportedByCurrentProtocol);
1897 }
1898
1899 /*
1900  * dump unsupported/ignored messages at most twice per minute,
1901  * some apps send those very frequently
1902  */
1903 static unsigned long ignored_msg_dump_time;
1904
1905 /*
1906  * unsupported CAPI message handler
1907  */
1908 static void do_unsupported(struct gigaset_capi_ctr *iif,
1909                            struct gigaset_capi_appl *ap,
1910                            struct sk_buff *skb)
1911 {
1912         /* decode message */
1913         capi_message2cmsg(&iif->acmsg, skb->data);
1914         if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000))
1915                 dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1916         send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
1917 }
1918
1919 /*
1920  * CAPI message handler: no-op
1921  */
1922 static void do_nothing(struct gigaset_capi_ctr *iif,
1923                        struct gigaset_capi_appl *ap,
1924                        struct sk_buff *skb)
1925 {
1926         if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000)) {
1927                 /* decode message */
1928                 capi_message2cmsg(&iif->acmsg, skb->data);
1929                 dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1930         }
1931         dev_kfree_skb(skb);
1932 }
1933
1934 static void do_data_b3_resp(struct gigaset_capi_ctr *iif,
1935                             struct gigaset_capi_appl *ap,
1936                             struct sk_buff *skb)
1937 {
1938         dump_rawmsg(DEBUG_LLDATA, __func__, skb->data);
1939         dev_kfree_skb(skb);
1940 }
1941
1942 /* table of outgoing CAPI message handlers with lookup function */
1943 typedef void (*capi_send_handler_t)(struct gigaset_capi_ctr *,
1944                                     struct gigaset_capi_appl *,
1945                                     struct sk_buff *);
1946
1947 static struct {
1948         u16 cmd;
1949         capi_send_handler_t handler;
1950 } capi_send_handler_table[] = {
1951         /* most frequent messages first for faster lookup */
1952         { CAPI_DATA_B3_REQ, do_data_b3_req },
1953         { CAPI_DATA_B3_RESP, do_data_b3_resp },
1954
1955         { CAPI_ALERT_REQ, do_alert_req },
1956         { CAPI_CONNECT_ACTIVE_RESP, do_nothing },
1957         { CAPI_CONNECT_B3_ACTIVE_RESP, do_nothing },
1958         { CAPI_CONNECT_B3_REQ, do_connect_b3_req },
1959         { CAPI_CONNECT_B3_RESP, do_connect_b3_resp },
1960         { CAPI_CONNECT_B3_T90_ACTIVE_RESP, do_nothing },
1961         { CAPI_CONNECT_REQ, do_connect_req },
1962         { CAPI_CONNECT_RESP, do_connect_resp },
1963         { CAPI_DISCONNECT_B3_REQ, do_disconnect_b3_req },
1964         { CAPI_DISCONNECT_B3_RESP, do_nothing },
1965         { CAPI_DISCONNECT_REQ, do_disconnect_req },
1966         { CAPI_DISCONNECT_RESP, do_nothing },
1967         { CAPI_FACILITY_REQ, do_facility_req },
1968         { CAPI_FACILITY_RESP, do_nothing },
1969         { CAPI_LISTEN_REQ, do_listen_req },
1970         { CAPI_SELECT_B_PROTOCOL_REQ, do_unsupported },
1971         { CAPI_RESET_B3_REQ, do_reset_b3_req },
1972         { CAPI_RESET_B3_RESP, do_nothing },
1973
1974         /*
1975          * ToDo: support overlap sending (requires ev-layer state
1976          * machine extension to generate additional ATD commands)
1977          */
1978         { CAPI_INFO_REQ, do_unsupported },
1979         { CAPI_INFO_RESP, do_nothing },
1980
1981         /*
1982          * ToDo: what's the proper response for these?
1983          */
1984         { CAPI_MANUFACTURER_REQ, do_nothing },
1985         { CAPI_MANUFACTURER_RESP, do_nothing },
1986 };
1987
1988 /* look up handler */
1989 static inline capi_send_handler_t lookup_capi_send_handler(const u16 cmd)
1990 {
1991         size_t i;
1992
1993         for (i = 0; i < ARRAY_SIZE(capi_send_handler_table); i++)
1994                 if (capi_send_handler_table[i].cmd == cmd)
1995                         return capi_send_handler_table[i].handler;
1996         return NULL;
1997 }
1998
1999
2000 /**
2001  * gigaset_send_message() - accept a CAPI message from an application
2002  * @ctr:        controller descriptor structure.
2003  * @skb:        CAPI message.
2004  *
2005  * Return value: CAPI error code
2006  * Note: capidrv (and probably others, too) only uses the return value to
2007  * decide whether it has to free the skb (only if result != CAPI_NOERROR (0))
2008  */
2009 static u16 gigaset_send_message(struct capi_ctr *ctr, struct sk_buff *skb)
2010 {
2011         struct gigaset_capi_ctr *iif
2012                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
2013         struct cardstate *cs = ctr->driverdata;
2014         struct gigaset_capi_appl *ap;
2015         capi_send_handler_t handler;
2016
2017         /* can only handle linear sk_buffs */
2018         if (skb_linearize(skb) < 0) {
2019                 dev_warn(cs->dev, "%s: skb_linearize failed\n", __func__);
2020                 return CAPI_MSGOSRESOURCEERR;
2021         }
2022
2023         /* retrieve application data structure */
2024         ap = get_appl(iif, CAPIMSG_APPID(skb->data));
2025         if (!ap) {
2026                 dev_notice(cs->dev, "%s: application %u not registered\n",
2027                            __func__, CAPIMSG_APPID(skb->data));
2028                 return CAPI_ILLAPPNR;
2029         }
2030
2031         /* look up command */
2032         handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
2033         if (!handler) {
2034                 /* unknown/unsupported message type */
2035                 if (printk_ratelimit())
2036                         dev_notice(cs->dev, "%s: unsupported message %u\n",
2037                                    __func__, CAPIMSG_CMD(skb->data));
2038                 return CAPI_ILLCMDORSUBCMDORMSGTOSMALL;
2039         }
2040
2041         /* serialize */
2042         if (atomic_add_return(1, &iif->sendqlen) > 1) {
2043                 /* queue behind other messages */
2044                 skb_queue_tail(&iif->sendqueue, skb);
2045                 return CAPI_NOERROR;
2046         }
2047
2048         /* process message */
2049         handler(iif, ap, skb);
2050
2051         /* process other messages arrived in the meantime */
2052         while (atomic_sub_return(1, &iif->sendqlen) > 0) {
2053                 skb = skb_dequeue(&iif->sendqueue);
2054                 if (!skb) {
2055                         /* should never happen */
2056                         dev_err(cs->dev, "%s: send queue empty\n", __func__);
2057                         continue;
2058                 }
2059                 ap = get_appl(iif, CAPIMSG_APPID(skb->data));
2060                 if (!ap) {
2061                         /* could that happen? */
2062                         dev_warn(cs->dev, "%s: application %u vanished\n",
2063                                  __func__, CAPIMSG_APPID(skb->data));
2064                         continue;
2065                 }
2066                 handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
2067                 if (!handler) {
2068                         /* should never happen */
2069                         dev_err(cs->dev, "%s: handler %x vanished\n",
2070                                 __func__, CAPIMSG_CMD(skb->data));
2071                         continue;
2072                 }
2073                 handler(iif, ap, skb);
2074         }
2075
2076         return CAPI_NOERROR;
2077 }
2078
2079 /**
2080  * gigaset_procinfo() - build single line description for controller
2081  * @ctr:        controller descriptor structure.
2082  *
2083  * Return value: pointer to generated string (null terminated)
2084  */
2085 static char *gigaset_procinfo(struct capi_ctr *ctr)
2086 {
2087         return ctr->name;       /* ToDo: more? */
2088 }
2089
2090 /**
2091  * gigaset_ctr_read_proc() - build controller proc file entry
2092  * @page:       buffer of PAGE_SIZE bytes for receiving the entry.
2093  * @start:      unused.
2094  * @off:        unused.
2095  * @count:      unused.
2096  * @eof:        unused.
2097  * @ctr:        controller descriptor structure.
2098  *
2099  * Return value: length of generated entry
2100  */
2101 static int gigaset_ctr_read_proc(char *page, char **start, off_t off,
2102                           int count, int *eof, struct capi_ctr *ctr)
2103 {
2104         struct cardstate *cs = ctr->driverdata;
2105         char *s;
2106         int i;
2107         int len = 0;
2108         len += sprintf(page+len, "%-16s %s\n", "name", ctr->name);
2109         len += sprintf(page+len, "%-16s %s %s\n", "dev",
2110                         dev_driver_string(cs->dev), dev_name(cs->dev));
2111         len += sprintf(page+len, "%-16s %d\n", "id", cs->myid);
2112         if (cs->gotfwver)
2113                 len += sprintf(page+len, "%-16s %d.%d.%d.%d\n", "firmware",
2114                         cs->fwver[0], cs->fwver[1], cs->fwver[2], cs->fwver[3]);
2115         len += sprintf(page+len, "%-16s %d\n", "channels",
2116                         cs->channels);
2117         len += sprintf(page+len, "%-16s %s\n", "onechannel",
2118                         cs->onechannel ? "yes" : "no");
2119
2120         switch (cs->mode) {
2121         case M_UNKNOWN:
2122                 s = "unknown";
2123                 break;
2124         case M_CONFIG:
2125                 s = "config";
2126                 break;
2127         case M_UNIMODEM:
2128                 s = "Unimodem";
2129                 break;
2130         case M_CID:
2131                 s = "CID";
2132                 break;
2133         default:
2134                 s = "??";
2135         }
2136         len += sprintf(page+len, "%-16s %s\n", "mode", s);
2137
2138         switch (cs->mstate) {
2139         case MS_UNINITIALIZED:
2140                 s = "uninitialized";
2141                 break;
2142         case MS_INIT:
2143                 s = "init";
2144                 break;
2145         case MS_LOCKED:
2146                 s = "locked";
2147                 break;
2148         case MS_SHUTDOWN:
2149                 s = "shutdown";
2150                 break;
2151         case MS_RECOVER:
2152                 s = "recover";
2153                 break;
2154         case MS_READY:
2155                 s = "ready";
2156                 break;
2157         default:
2158                 s = "??";
2159         }
2160         len += sprintf(page+len, "%-16s %s\n", "mstate", s);
2161
2162         len += sprintf(page+len, "%-16s %s\n", "running",
2163                         cs->running ? "yes" : "no");
2164         len += sprintf(page+len, "%-16s %s\n", "connected",
2165                         cs->connected ? "yes" : "no");
2166         len += sprintf(page+len, "%-16s %s\n", "isdn_up",
2167                         cs->isdn_up ? "yes" : "no");
2168         len += sprintf(page+len, "%-16s %s\n", "cidmode",
2169                         cs->cidmode ? "yes" : "no");
2170
2171         for (i = 0; i < cs->channels; i++) {
2172                 len += sprintf(page+len, "[%d]%-13s %d\n", i, "corrupted",
2173                                 cs->bcs[i].corrupted);
2174                 len += sprintf(page+len, "[%d]%-13s %d\n", i, "trans_down",
2175                                 cs->bcs[i].trans_down);
2176                 len += sprintf(page+len, "[%d]%-13s %d\n", i, "trans_up",
2177                                 cs->bcs[i].trans_up);
2178                 len += sprintf(page+len, "[%d]%-13s %d\n", i, "chstate",
2179                                 cs->bcs[i].chstate);
2180                 switch (cs->bcs[i].proto2) {
2181                 case L2_BITSYNC:
2182                         s = "bitsync";
2183                         break;
2184                 case L2_HDLC:
2185                         s = "HDLC";
2186                         break;
2187                 case L2_VOICE:
2188                         s = "voice";
2189                         break;
2190                 default:
2191                         s = "??";
2192                 }
2193                 len += sprintf(page+len, "[%d]%-13s %s\n", i, "proto2", s);
2194         }
2195         return len;
2196 }
2197
2198
2199 static struct capi_driver capi_driver_gigaset = {
2200         .name           = "gigaset",
2201         .revision       = "1.0",
2202 };
2203
2204 /**
2205  * gigaset_isdn_register() - register to LL
2206  * @cs:         device descriptor structure.
2207  * @isdnid:     device name.
2208  *
2209  * Called by main module to register the device with the LL.
2210  *
2211  * Return value: 1 for success, 0 for failure
2212  */
2213 int gigaset_isdn_register(struct cardstate *cs, const char *isdnid)
2214 {
2215         struct gigaset_capi_ctr *iif;
2216         int rc;
2217
2218         pr_info("Kernel CAPI interface\n");
2219
2220         iif = kmalloc(sizeof(*iif), GFP_KERNEL);
2221         if (!iif) {
2222                 pr_err("%s: out of memory\n", __func__);
2223                 return 0;
2224         }
2225
2226         /* register driver with CAPI (ToDo: what for?) */
2227         register_capi_driver(&capi_driver_gigaset);
2228
2229         /* prepare controller structure */
2230         iif->ctr.owner         = THIS_MODULE;
2231         iif->ctr.driverdata    = cs;
2232         strncpy(iif->ctr.name, isdnid, sizeof(iif->ctr.name));
2233         iif->ctr.driver_name   = "gigaset";
2234         iif->ctr.load_firmware = gigaset_load_firmware;
2235         iif->ctr.reset_ctr     = gigaset_reset_ctr;
2236         iif->ctr.register_appl = gigaset_register_appl;
2237         iif->ctr.release_appl  = gigaset_release_appl;
2238         iif->ctr.send_message  = gigaset_send_message;
2239         iif->ctr.procinfo      = gigaset_procinfo;
2240         iif->ctr.ctr_read_proc = gigaset_ctr_read_proc;
2241         INIT_LIST_HEAD(&iif->appls);
2242         skb_queue_head_init(&iif->sendqueue);
2243         atomic_set(&iif->sendqlen, 0);
2244
2245         /* register controller with CAPI */
2246         rc = attach_capi_ctr(&iif->ctr);
2247         if (rc) {
2248                 pr_err("attach_capi_ctr failed (%d)\n", rc);
2249                 unregister_capi_driver(&capi_driver_gigaset);
2250                 kfree(iif);
2251                 return 0;
2252         }
2253
2254         cs->iif = iif;
2255         cs->hw_hdr_len = CAPI_DATA_B3_REQ_LEN;
2256         return 1;
2257 }
2258
2259 /**
2260  * gigaset_isdn_unregister() - unregister from LL
2261  * @cs:         device descriptor structure.
2262  *
2263  * Called by main module to unregister the device from the LL.
2264  */
2265 void gigaset_isdn_unregister(struct cardstate *cs)
2266 {
2267         struct gigaset_capi_ctr *iif = cs->iif;
2268
2269         detach_capi_ctr(&iif->ctr);
2270         kfree(iif);
2271         cs->iif = NULL;
2272         unregister_capi_driver(&capi_driver_gigaset);
2273 }