drivers/isdn/gigaset/capi.c

   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/proc_fs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/ratelimit.h>
  18 #include <linux/isdn/capilli.h>
  19 #include <linux/isdn/capicmd.h>
  20 #include <linux/isdn/capiutil.h>
  21 #include <linux/export.h>
  22
  23 /* missing from kernelcapi.h */
  24 #define CapiNcpiNotSupportedByProtocol  0x0001
  25 #define CapiFlagsNotSupportedByProtocol 0x0002
  26 #define CapiAlertAlreadySent            0x0003
  27 #define CapiFacilitySpecificFunctionNotSupported        0x3011
  28
  29 /* missing from capicmd.h */
  30 #define CAPI_CONNECT_IND_BASELEN        (CAPI_MSG_BASELEN + 4 + 2 + 8 * 1)
  31 #define CAPI_CONNECT_ACTIVE_IND_BASELEN (CAPI_MSG_BASELEN + 4 + 3 * 1)
  32 #define CAPI_CONNECT_B3_IND_BASELEN     (CAPI_MSG_BASELEN + 4 + 1)
  33 #define CAPI_CONNECT_B3_ACTIVE_IND_BASELEN      (CAPI_MSG_BASELEN + 4 + 1)
  34 #define CAPI_DATA_B3_REQ_LEN64          (CAPI_MSG_BASELEN + 4 + 4 + 2 + 2 + 2 + 8)
  35 #define CAPI_DATA_B3_CONF_LEN           (CAPI_MSG_BASELEN + 4 + 2 + 2)
  36 #define CAPI_DISCONNECT_IND_LEN         (CAPI_MSG_BASELEN + 4 + 2)
  37 #define CAPI_DISCONNECT_B3_IND_BASELEN  (CAPI_MSG_BASELEN + 4 + 2 + 1)
  38 #define CAPI_FACILITY_CONF_BASELEN      (CAPI_MSG_BASELEN + 4 + 2 + 2 + 1)
  39 /* most _CONF messages contain only Controller/PLCI/NCCI and Info parameters */
  40 #define CAPI_STDCONF_LEN                (CAPI_MSG_BASELEN + 4 + 2)
  41
  42 #define CAPI_FACILITY_HANDSET   0x0000
  43 #define CAPI_FACILITY_DTMF      0x0001
  44 #define CAPI_FACILITY_V42BIS    0x0002
  45 #define CAPI_FACILITY_SUPPSVC   0x0003
  46 #define CAPI_FACILITY_WAKEUP    0x0004
  47 #define CAPI_FACILITY_LI        0x0005
  48
  49 #define CAPI_SUPPSVC_GETSUPPORTED       0x0000
  50 #define CAPI_SUPPSVC_LISTEN             0x0001
  51
  52 /* missing from capiutil.h */
  53 #define CAPIMSG_PLCI_PART(m)    CAPIMSG_U8(m, 9)
  54 #define CAPIMSG_NCCI_PART(m)    CAPIMSG_U16(m, 10)
  55 #define CAPIMSG_HANDLE_REQ(m)   CAPIMSG_U16(m, 18) /* DATA_B3_REQ/_IND only! */
  56 #define CAPIMSG_FLAGS(m)        CAPIMSG_U16(m, 20)
  57 #define CAPIMSG_SETCONTROLLER(m, contr) capimsg_setu8(m, 8, contr)
  58 #define CAPIMSG_SETPLCI_PART(m, plci)   capimsg_setu8(m, 9, plci)
  59 #define CAPIMSG_SETNCCI_PART(m, ncci)   capimsg_setu16(m, 10, ncci)
  60 #define CAPIMSG_SETFLAGS(m, flags)      capimsg_setu16(m, 20, flags)
  61
  62 /* parameters with differing location in DATA_B3_CONF/_RESP: */
  63 #define CAPIMSG_SETHANDLE_CONF(m, handle)       capimsg_setu16(m, 12, handle)
  64 #define CAPIMSG_SETINFO_CONF(m, info)           capimsg_setu16(m, 14, info)
  65
  66 /* Flags (DATA_B3_REQ/_IND) */
  67 #define CAPI_FLAGS_DELIVERY_CONFIRMATION        0x04
  68 #define CAPI_FLAGS_RESERVED                     (~0x1f)
  69
  70 /* buffer sizes */
  71 #define MAX_BC_OCTETS 11
  72 #define MAX_HLC_OCTETS 3
  73 #define MAX_NUMBER_DIGITS 20
  74 #define MAX_FMT_IE_LEN 20
  75
  76 /* values for bcs->apconnstate */
  77 #define APCONN_NONE     0       /* inactive/listening */
  78 #define APCONN_SETUP    1       /* connecting */
  79 #define APCONN_ACTIVE   2       /* B channel up */
  80
  81 /* registered application data structure */
  82 struct gigaset_capi_appl {
  83         struct list_head ctrlist;
  84         struct gigaset_capi_appl *bcnext;
  85         u16 id;
  86         struct capi_register_params rp;
  87         u16 nextMessageNumber;
  88         u32 listenInfoMask;
  89         u32 listenCIPmask;
  90 };
  91
  92 /* CAPI specific controller data structure */
  93 struct gigaset_capi_ctr {
  94         struct capi_ctr ctr;
  95         struct list_head appls;
  96         struct sk_buff_head sendqueue;
  97         atomic_t sendqlen;
  98         /* two _cmsg structures possibly used concurrently: */
  99         _cmsg hcmsg;    /* for message composition triggered from hardware */
 100         _cmsg acmsg;    /* for dissection of messages sent from application */
 101         u8 bc_buf[MAX_BC_OCTETS + 1];
 102         u8 hlc_buf[MAX_HLC_OCTETS + 1];
 103         u8 cgpty_buf[MAX_NUMBER_DIGITS + 3];
 104         u8 cdpty_buf[MAX_NUMBER_DIGITS + 2];
 105 };
 106
 107 /* CIP Value table (from CAPI 2.0 standard, ch. 6.1) */
 108 static struct {
 109         u8 *bc;
 110         u8 *hlc;
 111 } cip2bchlc[] = {
 112         [1] = { "8090A3", NULL },       /* Speech (A-law) */
 113         [2] = { "8890", NULL },         /* Unrestricted digital information */
 114         [3] = { "8990", NULL },         /* Restricted digital information */
 115         [4] = { "9090A3", NULL },       /* 3,1 kHz audio (A-law) */
 116         [5] = { "9190", NULL },         /* 7 kHz audio */
 117         [6] = { "9890", NULL },         /* Video */
 118         [7] = { "88C0C6E6", NULL },     /* Packet mode */
 119         [8] = { "8890218F", NULL },     /* 56 kbit/s rate adaptation */
 120         [9] = { "9190A5", NULL },       /* Unrestricted digital information
 121                                          * with tones/announcements */
 122         [16] = { "8090A3", "9181" },    /* Telephony */
 123         [17] = { "9090A3", "9184" },    /* Group 2/3 facsimile */
 124         [18] = { "8890", "91A1" },      /* Group 4 facsimile Class 1 */
 125         [19] = { "8890", "91A4" },      /* Teletex service basic and mixed mode
 126                                          * and Group 4 facsimile service
 127                                          * Classes II and III */
 128         [20] = { "8890", "91A8" },      /* Teletex service basic and
 129                                          * processable mode */
 130         [21] = { "8890", "91B1" },      /* Teletex service basic mode */
 131         [22] = { "8890", "91B2" },      /* International interworking for
 132                                          * Videotex */
 133         [23] = { "8890", "91B5" },      /* Telex */
 134         [24] = { "8890", "91B8" },      /* Message Handling Systems
 135                                          * in accordance with X.400 */
 136         [25] = { "8890", "91C1" },      /* OSI application
 137                                          * in accordance with X.200 */
 138         [26] = { "9190A5", "9181" },    /* 7 kHz telephony */
 139         [27] = { "9190A5", "916001" },  /* Video telephony, first connection */
 140         [28] = { "8890", "916002" },    /* Video telephony, second connection */
 141 };
 142
 143 /*
 144  * helper functions
 145  * ================
 146  */
 147
 148 /*
 149  * emit unsupported parameter warning
 150  */
 151 static inline void ignore_cstruct_param(struct cardstate *cs, _cstruct param,
 152                                         char *msgname, char *paramname)
 153 {
 154         if (param && *param)
 155                 dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
 156                          msgname, paramname);
 157 }
 158
 159 /*
 160  * convert an IE from Gigaset hex string to ETSI binary representation
 161  * including length byte
 162  * return value: result length, -1 on error
 163  */
 164 static int encode_ie(char *in, u8 *out, int maxlen)
 165 {
 166         int l = 0;
 167         while (*in) {
 168                 if (!isxdigit(in[0]) || !isxdigit(in[1]) || l >= maxlen)
 169                         return -1;
 170                 out[++l] = (hex_to_bin(in[0]) << 4) + hex_to_bin(in[1]);
 171                 in += 2;
 172         }
 173         out[0] = l;
 174         return l;
 175 }
 176
 177 /*
 178  * convert an IE from ETSI binary representation including length byte
 179  * to Gigaset hex string
 180  */
 181 static void decode_ie(u8 *in, char *out)
 182 {
 183         int i = *in;
 184         while (i-- > 0) {
 185                 /* ToDo: conversion to upper case necessary? */
 186                 *out++ = toupper(hex_asc_hi(*++in));
 187                 *out++ = toupper(hex_asc_lo(*in));
 188         }
 189 }
 190
 191 /*
 192  * retrieve application data structure for an application ID
 193  */
 194 static inline struct gigaset_capi_appl *
 195 get_appl(struct gigaset_capi_ctr *iif, u16 appl)
 196 {
 197         struct gigaset_capi_appl *ap;
 198
 199         list_for_each_entry(ap, &iif->appls, ctrlist)
 200                 if (ap->id == appl)
 201                         return ap;
 202         return NULL;
 203 }
 204
 205 /*
 206  * dump CAPI message to kernel messages for debugging
 207  */
 208 static inline void dump_cmsg(enum debuglevel level, const char *tag, _cmsg *p)
 209 {
 210 #ifdef CONFIG_GIGASET_DEBUG
 211         /* dump at most 20 messages in 20 secs */
 212         static DEFINE_RATELIMIT_STATE(msg_dump_ratelimit, 20 * HZ, 20);
 213         _cdebbuf *cdb;
 214
 215         if (!(gigaset_debuglevel & level))
 216                 return;
 217         if (!___ratelimit(&msg_dump_ratelimit, tag))
 218                 return;
 219
 220         cdb = capi_cmsg2str(p);
 221         if (cdb) {
 222                 gig_dbg(level, "%s: [%d] %s", tag, p->ApplId, cdb->buf);
 223                 cdebbuf_free(cdb);
 224         } else {
 225                 gig_dbg(level, "%s: [%d] %s", tag, p->ApplId,
 226                         capi_cmd2str(p->Command, p->Subcommand));
 227         }
 228 #endif
 229 }
 230
 231 static inline void dump_rawmsg(enum debuglevel level, const char *tag,
 232                                unsigned char *data)
 233 {
 234 #ifdef CONFIG_GIGASET_DEBUG
 235         char *dbgline;
 236         int i, l;
 237
 238         if (!(gigaset_debuglevel & level))
 239                 return;
 240
 241         l = CAPIMSG_LEN(data);
 242         if (l < 12) {
 243                 gig_dbg(level, "%s: ??? LEN=%04d", tag, l);
 244                 return;
 245         }
 246         gig_dbg(level, "%s: 0x%02x:0x%02x: ID=%03d #0x%04x LEN=%04d NCCI=0x%x",
 247                 tag, CAPIMSG_COMMAND(data), CAPIMSG_SUBCOMMAND(data),
 248                 CAPIMSG_APPID(data), CAPIMSG_MSGID(data), l,
 249                 CAPIMSG_CONTROL(data));
 250         l -= 12;
 251         if (l <= 0)
 252                 return;
 253         dbgline = kmalloc(3 * l, GFP_ATOMIC);
 254         if (!dbgline)
 255                 return;
 256         for (i = 0; i < l; i++) {
 257                 dbgline[3 * i] = hex_asc_hi(data[12 + i]);
 258                 dbgline[3 * i + 1] = hex_asc_lo(data[12 + i]);
 259                 dbgline[3 * i + 2] = ' ';
 260         }
 261         dbgline[3 * l - 1] = '\0';
 262         gig_dbg(level, "  %s", dbgline);
 263         kfree(dbgline);
 264         if (CAPIMSG_COMMAND(data) == CAPI_DATA_B3 &&
 265             (CAPIMSG_SUBCOMMAND(data) == CAPI_REQ ||
 266              CAPIMSG_SUBCOMMAND(data) == CAPI_IND)) {
 267                 l = CAPIMSG_DATALEN(data);
 268                 gig_dbg(level, "   DataLength=%d", l);
 269                 if (l <= 0 || !(gigaset_debuglevel & DEBUG_LLDATA))
 270                         return;
 271                 if (l > 64)
 272                         l = 64; /* arbitrary limit */
 273                 dbgline = kmalloc(3 * l, GFP_ATOMIC);
 274                 if (!dbgline)
 275                         return;
 276                 data += CAPIMSG_LEN(data);
 277                 for (i = 0; i < l; i++) {
 278                         dbgline[3 * i] = hex_asc_hi(data[i]);
 279                         dbgline[3 * i + 1] = hex_asc_lo(data[i]);
 280                         dbgline[3 * i + 2] = ' ';
 281                 }
 282                 dbgline[3 * l - 1] = '\0';
 283                 gig_dbg(level, "  %s", dbgline);
 284                 kfree(dbgline);
 285         }
 286 #endif
 287 }
 288
 289 /*
 290  * format CAPI IE as string
 291  */
 292
 293 #ifdef CONFIG_GIGASET_DEBUG
 294 static const char *format_ie(const char *ie)
 295 {
 296         static char result[3 * MAX_FMT_IE_LEN];
 297         int len, count;
 298         char *pout = result;
 299
 300         if (!ie)
 301                 return "NULL";
 302
 303         count = len = ie[0];
 304         if (count > MAX_FMT_IE_LEN)
 305                 count = MAX_FMT_IE_LEN - 1;
 306         while (count--) {
 307                 *pout++ = hex_asc_hi(*++ie);
 308                 *pout++ = hex_asc_lo(*ie);
 309                 *pout++ = ' ';
 310         }
 311         if (len > MAX_FMT_IE_LEN) {
 312                 *pout++ = '.';
 313                 *pout++ = '.';
 314                 *pout++ = '.';
 315         }
 316         *--pout = 0;
 317         return result;
 318 }
 319 #endif
 320
 321 /*
 322  * emit DATA_B3_CONF message
 323  */
 324 static void send_data_b3_conf(struct cardstate *cs, struct capi_ctr *ctr,
 325                               u16 appl, u16 msgid, int channel,
 326                               u16 handle, u16 info)
 327 {
 328         struct sk_buff *cskb;
 329         u8 *msg;
 330
 331         cskb = alloc_skb(CAPI_DATA_B3_CONF_LEN, GFP_ATOMIC);
 332         if (!cskb) {
 333                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 334                 return;
 335         }
 336         /* frequent message, avoid _cmsg overhead */
 337         msg = __skb_put(cskb, CAPI_DATA_B3_CONF_LEN);
 338         CAPIMSG_SETLEN(msg, CAPI_DATA_B3_CONF_LEN);
 339         CAPIMSG_SETAPPID(msg, appl);
 340         CAPIMSG_SETCOMMAND(msg, CAPI_DATA_B3);
 341         CAPIMSG_SETSUBCOMMAND(msg,  CAPI_CONF);
 342         CAPIMSG_SETMSGID(msg, msgid);
 343         CAPIMSG_SETCONTROLLER(msg, ctr->cnr);
 344         CAPIMSG_SETPLCI_PART(msg, channel);
 345         CAPIMSG_SETNCCI_PART(msg, 1);
 346         CAPIMSG_SETHANDLE_CONF(msg, handle);
 347         CAPIMSG_SETINFO_CONF(msg, info);
 348
 349         /* emit message */
 350         dump_rawmsg(DEBUG_MCMD, __func__, msg);
 351         capi_ctr_handle_message(ctr, appl, cskb);
 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         unsigned char *req = skb_mac_header(dskb);
 374         u16 flags;
 375
 376         /* update statistics */
 377         ++bcs->trans_up;
 378
 379         if (!ap) {
 380                 gig_dbg(DEBUG_MCMD, "%s: application gone", __func__);
 381                 return;
 382         }
 383
 384         /* don't send further B3 messages if disconnected */
 385         if (bcs->apconnstate < APCONN_ACTIVE) {
 386                 gig_dbg(DEBUG_MCMD, "%s: disconnected", __func__);
 387                 return;
 388         }
 389
 390         /*
 391          * send DATA_B3_CONF if "delivery confirmation" bit was set in request;
 392          * otherwise it has already been sent by do_data_b3_req()
 393          */
 394         flags = CAPIMSG_FLAGS(req);
 395         if (flags & CAPI_FLAGS_DELIVERY_CONFIRMATION)
 396                 send_data_b3_conf(cs, &iif->ctr, ap->id, CAPIMSG_MSGID(req),
 397                                   bcs->channel + 1, CAPIMSG_HANDLE_REQ(req),
 398                                   (flags & ~CAPI_FLAGS_DELIVERY_CONFIRMATION) ?
 399                                   CapiFlagsNotSupportedByProtocol :
 400                                   CAPI_NOERROR);
 401 }
 402 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
 403
 404 /**
 405  * gigaset_skb_rcvd() - pass received skb to LL
 406  * @bcs:        B channel descriptor structure.
 407  * @skb:        received data.
 408  *
 409  * Called by hardware module {bas,ser,usb}_gigaset when user data has
 410  * been successfully received, for passing to the LL.
 411  * Warning: skb must not be accessed anymore!
 412  */
 413 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
 414 {
 415         struct cardstate *cs = bcs->cs;
 416         struct gigaset_capi_ctr *iif = cs->iif;
 417         struct gigaset_capi_appl *ap = bcs->ap;
 418         int len = skb->len;
 419
 420         /* update statistics */
 421         bcs->trans_down++;
 422
 423         if (!ap) {
 424                 gig_dbg(DEBUG_MCMD, "%s: application gone", __func__);
 425                 dev_kfree_skb_any(skb);
 426                 return;
 427         }
 428
 429         /* don't send further B3 messages if disconnected */
 430         if (bcs->apconnstate < APCONN_ACTIVE) {
 431                 gig_dbg(DEBUG_MCMD, "%s: disconnected", __func__);
 432                 dev_kfree_skb_any(skb);
 433                 return;
 434         }
 435
 436         /*
 437          * prepend DATA_B3_IND message to payload
 438          * Parameters: NCCI = 1, all others 0/unused
 439          * frequent message, avoid _cmsg overhead
 440          */
 441         skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 442         CAPIMSG_SETLEN(skb->data, CAPI_DATA_B3_REQ_LEN);
 443         CAPIMSG_SETAPPID(skb->data, ap->id);
 444         CAPIMSG_SETCOMMAND(skb->data, CAPI_DATA_B3);
 445         CAPIMSG_SETSUBCOMMAND(skb->data,  CAPI_IND);
 446         CAPIMSG_SETMSGID(skb->data, ap->nextMessageNumber++);
 447         CAPIMSG_SETCONTROLLER(skb->data, iif->ctr.cnr);
 448         CAPIMSG_SETPLCI_PART(skb->data, bcs->channel + 1);
 449         CAPIMSG_SETNCCI_PART(skb->data, 1);
 450         /* Data parameter not used */
 451         CAPIMSG_SETDATALEN(skb->data, len);
 452         /* Data handle parameter not used */
 453         CAPIMSG_SETFLAGS(skb->data, 0);
 454         /* Data64 parameter not present */
 455
 456         /* emit message */
 457         dump_rawmsg(DEBUG_MCMD, __func__, skb->data);
 458         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 459 }
 460 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
 461
 462 /**
 463  * gigaset_isdn_rcv_err() - signal receive error
 464  * @bcs:        B channel descriptor structure.
 465  *
 466  * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 467  * has occurred, for signalling to the LL.
 468  */
 469 void gigaset_isdn_rcv_err(struct bc_state *bcs)
 470 {
 471         /* if currently ignoring packets, just count down */
 472         if (bcs->ignore) {
 473                 bcs->ignore--;
 474                 return;
 475         }
 476
 477         /* update statistics */
 478         bcs->corrupted++;
 479
 480         /* ToDo: signal error -> LL */
 481 }
 482 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
 483
 484 /**
 485  * gigaset_isdn_icall() - signal incoming call
 486  * @at_state:   connection state structure.
 487  *
 488  * Called by main module at tasklet level to notify the LL that an incoming
 489  * call has been received. @at_state contains the parameters of the call.
 490  *
 491  * Return value: call disposition (ICALL_*)
 492  */
 493 int gigaset_isdn_icall(struct at_state_t *at_state)
 494 {
 495         struct cardstate *cs = at_state->cs;
 496         struct bc_state *bcs = at_state->bcs;
 497         struct gigaset_capi_ctr *iif = cs->iif;
 498         struct gigaset_capi_appl *ap;
 499         u32 actCIPmask;
 500         struct sk_buff *skb;
 501         unsigned int msgsize;
 502         unsigned long flags;
 503         int i;
 504
 505         /*
 506          * ToDo: signal calls without a free B channel, too
 507          * (requires a u8 handle for the at_state structure that can
 508          * be stored in the PLCI and used in the CONNECT_RESP message
 509          * handler to retrieve it)
 510          */
 511         if (!bcs)
 512                 return ICALL_IGNORE;
 513
 514         /* prepare CONNECT_IND message, using B channel number as PLCI */
 515         capi_cmsg_header(&iif->hcmsg, 0, CAPI_CONNECT, CAPI_IND, 0,
 516                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 517
 518         /* minimum size, all structs empty */
 519         msgsize = CAPI_CONNECT_IND_BASELEN;
 520
 521         /* Bearer Capability (mandatory) */
 522         if (at_state->str_var[STR_ZBC]) {
 523                 /* pass on BC from Gigaset */
 524                 if (encode_ie(at_state->str_var[STR_ZBC], iif->bc_buf,
 525                               MAX_BC_OCTETS) < 0) {
 526                         dev_warn(cs->dev, "RING ignored - bad BC %s\n",
 527                                  at_state->str_var[STR_ZBC]);
 528                         return ICALL_IGNORE;
 529                 }
 530
 531                 /* look up corresponding CIP value */
 532                 iif->hcmsg.CIPValue = 0;        /* default if nothing found */
 533                 for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
 534                         if (cip2bchlc[i].bc != NULL &&
 535                             cip2bchlc[i].hlc == NULL &&
 536                             !strcmp(cip2bchlc[i].bc,
 537                                     at_state->str_var[STR_ZBC])) {
 538                                 iif->hcmsg.CIPValue = i;
 539                                 break;
 540                         }
 541         } else {
 542                 /* no BC (internal call): assume CIP 1 (speech, A-law) */
 543                 iif->hcmsg.CIPValue = 1;
 544                 encode_ie(cip2bchlc[1].bc, iif->bc_buf, MAX_BC_OCTETS);
 545         }
 546         iif->hcmsg.BC = iif->bc_buf;
 547         msgsize += iif->hcmsg.BC[0];
 548
 549         /* High Layer Compatibility (optional) */
 550         if (at_state->str_var[STR_ZHLC]) {
 551                 /* pass on HLC from Gigaset */
 552                 if (encode_ie(at_state->str_var[STR_ZHLC], iif->hlc_buf,
 553                               MAX_HLC_OCTETS) < 0) {
 554                         dev_warn(cs->dev, "RING ignored - bad HLC %s\n",
 555                                  at_state->str_var[STR_ZHLC]);
 556                         return ICALL_IGNORE;
 557                 }
 558                 iif->hcmsg.HLC = iif->hlc_buf;
 559                 msgsize += iif->hcmsg.HLC[0];
 560
 561                 /* look up corresponding CIP value */
 562                 /* keep BC based CIP value if none found */
 563                 if (at_state->str_var[STR_ZBC])
 564                         for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
 565                                 if (cip2bchlc[i].hlc != NULL &&
 566                                     !strcmp(cip2bchlc[i].hlc,
 567                                             at_state->str_var[STR_ZHLC]) &&
 568                                     !strcmp(cip2bchlc[i].bc,
 569                                             at_state->str_var[STR_ZBC])) {
 570                                         iif->hcmsg.CIPValue = i;
 571                                         break;
 572                                 }
 573         }
 574
 575         /* Called Party Number (optional) */
 576         if (at_state->str_var[STR_ZCPN]) {
 577                 i = strlen(at_state->str_var[STR_ZCPN]);
 578                 if (i > MAX_NUMBER_DIGITS) {
 579                         dev_warn(cs->dev, "RING ignored - bad number %s\n",
 580                                  at_state->str_var[STR_ZBC]);
 581                         return ICALL_IGNORE;
 582                 }
 583                 iif->cdpty_buf[0] = i + 1;
 584                 iif->cdpty_buf[1] = 0x80; /* type / numbering plan unknown */
 585                 memcpy(iif->cdpty_buf + 2, at_state->str_var[STR_ZCPN], i);
 586                 iif->hcmsg.CalledPartyNumber = iif->cdpty_buf;
 587                 msgsize += iif->hcmsg.CalledPartyNumber[0];
 588         }
 589
 590         /* Calling Party Number (optional) */
 591         if (at_state->str_var[STR_NMBR]) {
 592                 i = strlen(at_state->str_var[STR_NMBR]);
 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->cgpty_buf[0] = i + 2;
 599                 iif->cgpty_buf[1] = 0x00; /* type / numbering plan unknown */
 600                 iif->cgpty_buf[2] = 0x80; /* pres. allowed, not screened */
 601                 memcpy(iif->cgpty_buf + 3, at_state->str_var[STR_NMBR], i);
 602                 iif->hcmsg.CallingPartyNumber = iif->cgpty_buf;
 603                 msgsize += iif->hcmsg.CallingPartyNumber[0];
 604         }
 605
 606         /* remaining parameters (not supported, always left NULL):
 607          * - CalledPartySubaddress
 608          * - CallingPartySubaddress
 609          * - AdditionalInfo
 610          *   - BChannelinformation
 611          *   - Keypadfacility
 612          *   - Useruserdata
 613          *   - Facilitydataarray
 614          */
 615
 616         gig_dbg(DEBUG_CMD, "icall: PLCI %x CIP %d BC %s",
 617                 iif->hcmsg.adr.adrPLCI, iif->hcmsg.CIPValue,
 618                 format_ie(iif->hcmsg.BC));
 619         gig_dbg(DEBUG_CMD, "icall: HLC %s",
 620                 format_ie(iif->hcmsg.HLC));
 621         gig_dbg(DEBUG_CMD, "icall: CgPty %s",
 622                 format_ie(iif->hcmsg.CallingPartyNumber));
 623         gig_dbg(DEBUG_CMD, "icall: CdPty %s",
 624                 format_ie(iif->hcmsg.CalledPartyNumber));
 625
 626         /* scan application list for matching listeners */
 627         spin_lock_irqsave(&bcs->aplock, flags);
 628         if (bcs->ap != NULL || bcs->apconnstate != APCONN_NONE) {
 629                 dev_warn(cs->dev, "%s: channel not properly cleared (%p/%d)\n",
 630                          __func__, bcs->ap, bcs->apconnstate);
 631                 bcs->ap = NULL;
 632                 bcs->apconnstate = APCONN_NONE;
 633         }
 634         spin_unlock_irqrestore(&bcs->aplock, flags);
 635         actCIPmask = 1 | (1 << iif->hcmsg.CIPValue);
 636         list_for_each_entry(ap, &iif->appls, ctrlist)
 637                 if (actCIPmask & ap->listenCIPmask) {
 638                         /* build CONNECT_IND message for this application */
 639                         iif->hcmsg.ApplId = ap->id;
 640                         iif->hcmsg.Messagenumber = ap->nextMessageNumber++;
 641
 642                         skb = alloc_skb(msgsize, GFP_ATOMIC);
 643                         if (!skb) {
 644                                 dev_err(cs->dev, "%s: out of memory\n",
 645                                         __func__);
 646                                 break;
 647                         }
 648                         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 649                         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 650
 651                         /* add to listeners on this B channel, update state */
 652                         spin_lock_irqsave(&bcs->aplock, flags);
 653                         ap->bcnext = bcs->ap;
 654                         bcs->ap = ap;
 655                         bcs->chstate |= CHS_NOTIFY_LL;
 656                         bcs->apconnstate = APCONN_SETUP;
 657                         spin_unlock_irqrestore(&bcs->aplock, flags);
 658
 659                         /* emit message */
 660                         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 661                 }
 662
 663         /*
 664          * Return "accept" if any listeners.
 665          * Gigaset will send ALERTING.
 666          * There doesn't seem to be a way to avoid this.
 667          */
 668         return bcs->ap ? ICALL_ACCEPT : ICALL_IGNORE;
 669 }
 670
 671 /*
 672  * send a DISCONNECT_IND message to an application
 673  * does not sleep, clobbers the controller's hcmsg structure
 674  */
 675 static void send_disconnect_ind(struct bc_state *bcs,
 676                                 struct gigaset_capi_appl *ap, u16 reason)
 677 {
 678         struct cardstate *cs = bcs->cs;
 679         struct gigaset_capi_ctr *iif = cs->iif;
 680         struct sk_buff *skb;
 681
 682         if (bcs->apconnstate == APCONN_NONE)
 683                 return;
 684
 685         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT, CAPI_IND,
 686                          ap->nextMessageNumber++,
 687                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 688         iif->hcmsg.Reason = reason;
 689         skb = alloc_skb(CAPI_DISCONNECT_IND_LEN, GFP_ATOMIC);
 690         if (!skb) {
 691                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 692                 return;
 693         }
 694         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, CAPI_DISCONNECT_IND_LEN));
 695         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 696         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 697 }
 698
 699 /*
 700  * send a DISCONNECT_B3_IND message to an application
 701  * Parameters: NCCI = 1, NCPI empty, Reason_B3 = 0
 702  * does not sleep, clobbers the controller's hcmsg structure
 703  */
 704 static void send_disconnect_b3_ind(struct bc_state *bcs,
 705                                    struct gigaset_capi_appl *ap)
 706 {
 707         struct cardstate *cs = bcs->cs;
 708         struct gigaset_capi_ctr *iif = cs->iif;
 709         struct sk_buff *skb;
 710
 711         /* nothing to do if no logical connection active */
 712         if (bcs->apconnstate < APCONN_ACTIVE)
 713                 return;
 714         bcs->apconnstate = APCONN_SETUP;
 715
 716         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
 717                          ap->nextMessageNumber++,
 718                          iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
 719         skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_ATOMIC);
 720         if (!skb) {
 721                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 722                 return;
 723         }
 724         capi_cmsg2message(&iif->hcmsg,
 725                           __skb_put(skb, CAPI_DISCONNECT_B3_IND_BASELEN));
 726         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 727         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 728 }
 729
 730 /**
 731  * gigaset_isdn_connD() - signal D channel connect
 732  * @bcs:        B channel descriptor structure.
 733  *
 734  * Called by main module at tasklet level to notify the LL that the D channel
 735  * connection has been established.
 736  */
 737 void gigaset_isdn_connD(struct bc_state *bcs)
 738 {
 739         struct cardstate *cs = bcs->cs;
 740         struct gigaset_capi_ctr *iif = cs->iif;
 741         struct gigaset_capi_appl *ap;
 742         struct sk_buff *skb;
 743         unsigned int msgsize;
 744         unsigned long flags;
 745
 746         spin_lock_irqsave(&bcs->aplock, flags);
 747         ap = bcs->ap;
 748         if (!ap) {
 749                 spin_unlock_irqrestore(&bcs->aplock, flags);
 750                 gig_dbg(DEBUG_CMD, "%s: application gone", __func__);
 751                 return;
 752         }
 753         if (bcs->apconnstate == APCONN_NONE) {
 754                 spin_unlock_irqrestore(&bcs->aplock, flags);
 755                 dev_warn(cs->dev, "%s: application %u not connected\n",
 756                          __func__, ap->id);
 757                 return;
 758         }
 759         spin_unlock_irqrestore(&bcs->aplock, flags);
 760         while (ap->bcnext) {
 761                 /* this should never happen */
 762                 dev_warn(cs->dev, "%s: dropping extra application %u\n",
 763                          __func__, ap->bcnext->id);
 764                 send_disconnect_ind(bcs, ap->bcnext,
 765                                     CapiCallGivenToOtherApplication);
 766                 ap->bcnext = ap->bcnext->bcnext;
 767         }
 768
 769         /* prepare CONNECT_ACTIVE_IND message
 770          * Note: LLC not supported by device
 771          */
 772         capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_CONNECT_ACTIVE, CAPI_IND,
 773                          ap->nextMessageNumber++,
 774                          iif->ctr.cnr | ((bcs->channel + 1) << 8));
 775
 776         /* minimum size, all structs empty */
 777         msgsize = CAPI_CONNECT_ACTIVE_IND_BASELEN;
 778
 779         /* ToDo: set parameter: Connected number
 780          * (requires ev-layer state machine extension to collect
 781          * ZCON device reply)
 782          */
 783
 784         /* build and emit CONNECT_ACTIVE_IND message */
 785         skb = alloc_skb(msgsize, GFP_ATOMIC);
 786         if (!skb) {
 787                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 788                 return;
 789         }
 790         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 791         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 792         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 793 }
 794
 795 /**
 796  * gigaset_isdn_hupD() - signal D channel hangup
 797  * @bcs:        B channel descriptor structure.
 798  *
 799  * Called by main module at tasklet level to notify the LL that the D channel
 800  * connection has been shut down.
 801  */
 802 void gigaset_isdn_hupD(struct bc_state *bcs)
 803 {
 804         struct gigaset_capi_appl *ap;
 805         unsigned long flags;
 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         spin_lock_irqsave(&bcs->aplock, flags);
 813         while (bcs->ap != NULL) {
 814                 ap = bcs->ap;
 815                 bcs->ap = ap->bcnext;
 816                 spin_unlock_irqrestore(&bcs->aplock, flags);
 817                 send_disconnect_b3_ind(bcs, ap);
 818                 send_disconnect_ind(bcs, ap, 0);
 819                 spin_lock_irqsave(&bcs->aplock, flags);
 820         }
 821         bcs->apconnstate = APCONN_NONE;
 822         spin_unlock_irqrestore(&bcs->aplock, flags);
 823 }
 824
 825 /**
 826  * gigaset_isdn_connB() - signal B channel connect
 827  * @bcs:        B channel descriptor structure.
 828  *
 829  * Called by main module at tasklet level to notify the LL that the B channel
 830  * connection has been established.
 831  */
 832 void gigaset_isdn_connB(struct bc_state *bcs)
 833 {
 834         struct cardstate *cs = bcs->cs;
 835         struct gigaset_capi_ctr *iif = cs->iif;
 836         struct gigaset_capi_appl *ap;
 837         struct sk_buff *skb;
 838         unsigned long flags;
 839         unsigned int msgsize;
 840         u8 command;
 841
 842         spin_lock_irqsave(&bcs->aplock, flags);
 843         ap = bcs->ap;
 844         if (!ap) {
 845                 spin_unlock_irqrestore(&bcs->aplock, flags);
 846                 gig_dbg(DEBUG_CMD, "%s: application gone", __func__);
 847                 return;
 848         }
 849         if (!bcs->apconnstate) {
 850                 spin_unlock_irqrestore(&bcs->aplock, flags);
 851                 dev_warn(cs->dev, "%s: application %u not connected\n",
 852                          __func__, ap->id);
 853                 return;
 854         }
 855
 856         /*
 857          * emit CONNECT_B3_ACTIVE_IND if we already got CONNECT_B3_REQ;
 858          * otherwise we have to emit CONNECT_B3_IND first, and follow up with
 859          * CONNECT_B3_ACTIVE_IND in reply to CONNECT_B3_RESP
 860          * Parameters in both cases always: NCCI = 1, NCPI empty
 861          */
 862         if (bcs->apconnstate >= APCONN_ACTIVE) {
 863                 command = CAPI_CONNECT_B3_ACTIVE;
 864                 msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
 865         } else {
 866                 command = CAPI_CONNECT_B3;
 867                 msgsize = CAPI_CONNECT_B3_IND_BASELEN;
 868         }
 869         bcs->apconnstate = APCONN_ACTIVE;
 870
 871         spin_unlock_irqrestore(&bcs->aplock, flags);
 872
 873         while (ap->bcnext) {
 874                 /* this should never happen */
 875                 dev_warn(cs->dev, "%s: dropping extra application %u\n",
 876                          __func__, ap->bcnext->id);
 877                 send_disconnect_ind(bcs, ap->bcnext,
 878                                     CapiCallGivenToOtherApplication);
 879                 ap->bcnext = ap->bcnext->bcnext;
 880         }
 881
 882         capi_cmsg_header(&iif->hcmsg, ap->id, command, CAPI_IND,
 883                          ap->nextMessageNumber++,
 884                          iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
 885         skb = alloc_skb(msgsize, GFP_ATOMIC);
 886         if (!skb) {
 887                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 888                 return;
 889         }
 890         capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
 891         dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
 892         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
 893 }
 894
 895 /**
 896  * gigaset_isdn_hupB() - signal B channel hangup
 897  * @bcs:        B channel descriptor structure.
 898  *
 899  * Called by main module to notify the LL that the B channel connection has
 900  * been shut down.
 901  */
 902 void gigaset_isdn_hupB(struct bc_state *bcs)
 903 {
 904         struct gigaset_capi_appl *ap = bcs->ap;
 905
 906         /* ToDo: assure order of DISCONNECT_B3_IND and DISCONNECT_IND ? */
 907
 908         if (!ap) {
 909                 gig_dbg(DEBUG_CMD, "%s: application gone", __func__);
 910                 return;
 911         }
 912
 913         send_disconnect_b3_ind(bcs, ap);
 914 }
 915
 916 /**
 917  * gigaset_isdn_start() - signal device availability
 918  * @cs:         device descriptor structure.
 919  *
 920  * Called by main module to notify the LL that the device is available for
 921  * use.
 922  */
 923 void gigaset_isdn_start(struct cardstate *cs)
 924 {
 925         struct gigaset_capi_ctr *iif = cs->iif;
 926
 927         /* fill profile data: manufacturer name */
 928         strcpy(iif->ctr.manu, "Siemens");
 929         /* CAPI and device version */
 930         iif->ctr.version.majorversion = 2;              /* CAPI 2.0 */
 931         iif->ctr.version.minorversion = 0;
 932         /* ToDo: check/assert cs->gotfwver? */
 933         iif->ctr.version.majormanuversion = cs->fwver[0];
 934         iif->ctr.version.minormanuversion = cs->fwver[1];
 935         /* number of B channels supported */
 936         iif->ctr.profile.nbchannel = cs->channels;
 937         /* global options: internal controller, supplementary services */
 938         iif->ctr.profile.goptions = 0x11;
 939         /* B1 protocols: 64 kbit/s HDLC or transparent */
 940         iif->ctr.profile.support1 =  0x03;
 941         /* B2 protocols: transparent only */
 942         /* ToDo: X.75 SLP ? */
 943         iif->ctr.profile.support2 =  0x02;
 944         /* B3 protocols: transparent only */
 945         iif->ctr.profile.support3 =  0x01;
 946         /* no serial number */
 947         strcpy(iif->ctr.serial, "0");
 948         capi_ctr_ready(&iif->ctr);
 949 }
 950
 951 /**
 952  * gigaset_isdn_stop() - signal device unavailability
 953  * @cs:         device descriptor structure.
 954  *
 955  * Called by main module to notify the LL that the device is no longer
 956  * available for use.
 957  */
 958 void gigaset_isdn_stop(struct cardstate *cs)
 959 {
 960         struct gigaset_capi_ctr *iif = cs->iif;
 961         capi_ctr_down(&iif->ctr);
 962 }
 963
 964 /*
 965  * kernel CAPI callback methods
 966  * ============================
 967  */
 968
 969 /*
 970  * register CAPI application
 971  */
 972 static void gigaset_register_appl(struct capi_ctr *ctr, u16 appl,
 973                                   capi_register_params *rp)
 974 {
 975         struct gigaset_capi_ctr *iif
 976                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
 977         struct cardstate *cs = ctr->driverdata;
 978         struct gigaset_capi_appl *ap;
 979
 980         gig_dbg(DEBUG_CMD, "%s [%u] l3cnt=%u blkcnt=%u blklen=%u",
 981                 __func__, appl, rp->level3cnt, rp->datablkcnt, rp->datablklen);
 982
 983         list_for_each_entry(ap, &iif->appls, ctrlist)
 984                 if (ap->id == appl) {
 985                         dev_notice(cs->dev,
 986                                    "application %u already registered\n", appl);
 987                         return;
 988                 }
 989
 990         ap = kzalloc(sizeof(*ap), GFP_KERNEL);
 991         if (!ap) {
 992                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 993                 return;
 994         }
 995         ap->id = appl;
 996         ap->rp = *rp;
 997
 998         list_add(&ap->ctrlist, &iif->appls);
 999         dev_info(cs->dev, "application %u registered\n", ap->id);
1000 }
1001
1002 /*
1003  * remove CAPI application from channel
1004  * helper function to keep indentation levels down and stay in 80 columns
1005  */
1006
1007 static inline void remove_appl_from_channel(struct bc_state *bcs,
1008                                             struct gigaset_capi_appl *ap)
1009 {
1010         struct cardstate *cs = bcs->cs;
1011         struct gigaset_capi_appl *bcap;
1012         unsigned long flags;
1013         int prevconnstate;
1014
1015         spin_lock_irqsave(&bcs->aplock, flags);
1016         bcap = bcs->ap;
1017         if (bcap == NULL) {
1018                 spin_unlock_irqrestore(&bcs->aplock, flags);
1019                 return;
1020         }
1021
1022         /* check first application on channel */
1023         if (bcap == ap) {
1024                 bcs->ap = ap->bcnext;
1025                 if (bcs->ap != NULL) {
1026                         spin_unlock_irqrestore(&bcs->aplock, flags);
1027                         return;
1028                 }
1029
1030                 /* none left, clear channel state */
1031                 prevconnstate = bcs->apconnstate;
1032                 bcs->apconnstate = APCONN_NONE;
1033                 spin_unlock_irqrestore(&bcs->aplock, flags);
1034
1035                 if (prevconnstate == APCONN_ACTIVE) {
1036                         dev_notice(cs->dev, "%s: hanging up channel %u\n",
1037                                    __func__, bcs->channel);
1038                         gigaset_add_event(cs, &bcs->at_state,
1039                                           EV_HUP, NULL, 0, NULL);
1040                         gigaset_schedule_event(cs);
1041                 }
1042                 return;
1043         }
1044
1045         /* check remaining list */
1046         do {
1047                 if (bcap->bcnext == ap) {
1048                         bcap->bcnext = bcap->bcnext->bcnext;
1049                         spin_unlock_irqrestore(&bcs->aplock, flags);
1050                         return;
1051                 }
1052                 bcap = bcap->bcnext;
1053         } while (bcap != NULL);
1054         spin_unlock_irqrestore(&bcs->aplock, flags);
1055 }
1056
1057 /*
1058  * release CAPI application
1059  */
1060 static void gigaset_release_appl(struct capi_ctr *ctr, u16 appl)
1061 {
1062         struct gigaset_capi_ctr *iif
1063                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
1064         struct cardstate *cs = iif->ctr.driverdata;
1065         struct gigaset_capi_appl *ap, *tmp;
1066         unsigned ch;
1067
1068         gig_dbg(DEBUG_CMD, "%s [%u]", __func__, appl);
1069
1070         list_for_each_entry_safe(ap, tmp, &iif->appls, ctrlist)
1071                 if (ap->id == appl) {
1072                         /* remove from any channels */
1073                         for (ch = 0; ch < cs->channels; ch++)
1074                                 remove_appl_from_channel(&cs->bcs[ch], ap);
1075
1076                         /* remove from registration list */
1077                         list_del(&ap->ctrlist);
1078                         kfree(ap);
1079                         dev_info(cs->dev, "application %u released\n", appl);
1080                 }
1081 }
1082
1083 /*
1084  * =====================================================================
1085  * outgoing CAPI message handler
1086  * =====================================================================
1087  */
1088
1089 /*
1090  * helper function: emit reply message with given Info value
1091  */
1092 static void send_conf(struct gigaset_capi_ctr *iif,
1093                       struct gigaset_capi_appl *ap,
1094                       struct sk_buff *skb,
1095                       u16 info)
1096 {
1097         /*
1098          * _CONF replies always only have NCCI and Info parameters
1099          * so they'll fit into the _REQ message skb
1100          */
1101         capi_cmsg_answer(&iif->acmsg);
1102         iif->acmsg.Info = info;
1103         capi_cmsg2message(&iif->acmsg, skb->data);
1104         __skb_trim(skb, CAPI_STDCONF_LEN);
1105         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1106         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
1107 }
1108
1109 /*
1110  * process FACILITY_REQ message
1111  */
1112 static void do_facility_req(struct gigaset_capi_ctr *iif,
1113                             struct gigaset_capi_appl *ap,
1114                             struct sk_buff *skb)
1115 {
1116         struct cardstate *cs = iif->ctr.driverdata;
1117         _cmsg *cmsg = &iif->acmsg;
1118         struct sk_buff *cskb;
1119         u8 *pparam;
1120         unsigned int msgsize = CAPI_FACILITY_CONF_BASELEN;
1121         u16 function, info;
1122         static u8 confparam[10];        /* max. 9 octets + length byte */
1123
1124         /* decode message */
1125         capi_message2cmsg(cmsg, skb->data);
1126         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1127
1128         /*
1129          * Facility Request Parameter is not decoded by capi_message2cmsg()
1130          * encoding depends on Facility Selector
1131          */
1132         switch (cmsg->FacilitySelector) {
1133         case CAPI_FACILITY_DTMF:        /* ToDo */
1134                 info = CapiFacilityNotSupported;
1135                 confparam[0] = 2;       /* length */
1136                 /* DTMF information: Unknown DTMF request */
1137                 capimsg_setu16(confparam, 1, 2);
1138                 break;
1139
1140         case CAPI_FACILITY_V42BIS:      /* not supported */
1141                 info = CapiFacilityNotSupported;
1142                 confparam[0] = 2;       /* length */
1143                 /* V.42 bis information: not available */
1144                 capimsg_setu16(confparam, 1, 1);
1145                 break;
1146
1147         case CAPI_FACILITY_SUPPSVC:
1148                 /* decode Function parameter */
1149                 pparam = cmsg->FacilityRequestParameter;
1150                 if (pparam == NULL || pparam[0] < 2) {
1151                         dev_notice(cs->dev, "%s: %s missing\n", "FACILITY_REQ",
1152                                    "Facility Request Parameter");
1153                         send_conf(iif, ap, skb, CapiIllMessageParmCoding);
1154                         return;
1155                 }
1156                 function = CAPIMSG_U16(pparam, 1);
1157                 switch (function) {
1158                 case CAPI_SUPPSVC_GETSUPPORTED:
1159                         info = CapiSuccess;
1160                         /* Supplementary Service specific parameter */
1161                         confparam[3] = 6;       /* length */
1162                         /* Supplementary services info: Success */
1163                         capimsg_setu16(confparam, 4, CapiSuccess);
1164                         /* Supported Services: none */
1165                         capimsg_setu32(confparam, 6, 0);
1166                         break;
1167                 case CAPI_SUPPSVC_LISTEN:
1168                         if (pparam[0] < 7 || pparam[3] < 4) {
1169                                 dev_notice(cs->dev, "%s: %s missing\n",
1170                                            "FACILITY_REQ", "Notification Mask");
1171                                 send_conf(iif, ap, skb,
1172                                           CapiIllMessageParmCoding);
1173                                 return;
1174                         }
1175                         if (CAPIMSG_U32(pparam, 4) != 0) {
1176                                 dev_notice(cs->dev,
1177                                            "%s: unsupported supplementary service notification mask 0x%x\n",
1178                                            "FACILITY_REQ", CAPIMSG_U32(pparam, 4));
1179                                 info = CapiFacilitySpecificFunctionNotSupported;
1180                                 confparam[3] = 2;       /* length */
1181                                 capimsg_setu16(confparam, 4,
1182                                                CapiSupplementaryServiceNotSupported);
1183                         }
1184                         info = CapiSuccess;
1185                         confparam[3] = 2;       /* length */
1186                         capimsg_setu16(confparam, 4, CapiSuccess);
1187                         break;
1188
1189                 /* ToDo: add supported services */
1190
1191                 default:
1192                         dev_notice(cs->dev,
1193                                    "%s: unsupported supplementary service function 0x%04x\n",
1194                                    "FACILITY_REQ", function);
1195                         info = CapiFacilitySpecificFunctionNotSupported;
1196                         /* Supplementary Service specific parameter */
1197                         confparam[3] = 2;       /* length */
1198                         /* Supplementary services info: not supported */
1199                         capimsg_setu16(confparam, 4,
1200                                        CapiSupplementaryServiceNotSupported);
1201                 }
1202
1203                 /* Facility confirmation parameter */
1204                 confparam[0] = confparam[3] + 3;        /* total length */
1205                 /* Function: copy from _REQ message */
1206                 capimsg_setu16(confparam, 1, function);
1207                 /* Supplementary Service specific parameter already set above */
1208                 break;
1209
1210         case CAPI_FACILITY_WAKEUP:      /* ToDo */
1211                 info = CapiFacilityNotSupported;
1212                 confparam[0] = 2;       /* length */
1213                 /* Number of accepted awake request parameters: 0 */
1214                 capimsg_setu16(confparam, 1, 0);
1215                 break;
1216
1217         default:
1218                 info = CapiFacilityNotSupported;
1219                 confparam[0] = 0;       /* empty struct */
1220         }
1221
1222         /* send FACILITY_CONF with given Info and confirmation parameter */
1223         capi_cmsg_answer(cmsg);
1224         cmsg->Info = info;
1225         cmsg->FacilityConfirmationParameter = confparam;
1226         msgsize += confparam[0];        /* length */
1227         cskb = alloc_skb(msgsize, GFP_ATOMIC);
1228         if (!cskb) {
1229                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1230                 return;
1231         }
1232         capi_cmsg2message(cmsg, __skb_put(cskb, msgsize));
1233         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1234         capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
1235 }
1236
1237
1238 /*
1239  * process LISTEN_REQ message
1240  * just store the masks in the application data structure
1241  */
1242 static void do_listen_req(struct gigaset_capi_ctr *iif,
1243                           struct gigaset_capi_appl *ap,
1244                           struct sk_buff *skb)
1245 {
1246         /* decode message */
1247         capi_message2cmsg(&iif->acmsg, skb->data);
1248         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1249
1250         /* store listening parameters */
1251         ap->listenInfoMask = iif->acmsg.InfoMask;
1252         ap->listenCIPmask = iif->acmsg.CIPmask;
1253         send_conf(iif, ap, skb, CapiSuccess);
1254 }
1255
1256 /*
1257  * process ALERT_REQ message
1258  * nothing to do, Gigaset always alerts anyway
1259  */
1260 static void do_alert_req(struct gigaset_capi_ctr *iif,
1261                          struct gigaset_capi_appl *ap,
1262                          struct sk_buff *skb)
1263 {
1264         /* decode message */
1265         capi_message2cmsg(&iif->acmsg, skb->data);
1266         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
1267         send_conf(iif, ap, skb, CapiAlertAlreadySent);
1268 }
1269
1270 /*
1271  * process CONNECT_REQ message
1272  * allocate a B channel, prepare dial commands, queue a DIAL event,
1273  * emit CONNECT_CONF reply
1274  */
1275 static void do_connect_req(struct gigaset_capi_ctr *iif,
1276                            struct gigaset_capi_appl *ap,
1277                            struct sk_buff *skb)
1278 {
1279         struct cardstate *cs = iif->ctr.driverdata;
1280         _cmsg *cmsg = &iif->acmsg;
1281         struct bc_state *bcs;
1282         char **commands;
1283         char *s;
1284         u8 *pp;
1285         unsigned long flags;
1286         int i, l, lbc, lhlc;
1287         u16 info;
1288
1289         /* decode message */
1290         capi_message2cmsg(cmsg, skb->data);
1291         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1292
1293         /* get free B channel & construct PLCI */
1294         bcs = gigaset_get_free_channel(cs);
1295         if (!bcs) {
1296                 dev_notice(cs->dev, "%s: no B channel available\n",
1297                            "CONNECT_REQ");
1298                 send_conf(iif, ap, skb, CapiNoPlciAvailable);
1299                 return;
1300         }
1301         spin_lock_irqsave(&bcs->aplock, flags);
1302         if (bcs->ap != NULL || bcs->apconnstate != APCONN_NONE)
1303                 dev_warn(cs->dev, "%s: channel not properly cleared (%p/%d)\n",
1304                          __func__, bcs->ap, bcs->apconnstate);
1305         ap->bcnext = NULL;
1306         bcs->ap = ap;
1307         bcs->apconnstate = APCONN_SETUP;
1308         spin_unlock_irqrestore(&bcs->aplock, flags);
1309
1310         bcs->rx_bufsize = ap->rp.datablklen;
1311         dev_kfree_skb(bcs->rx_skb);
1312         gigaset_new_rx_skb(bcs);
1313         cmsg->adr.adrPLCI |= (bcs->channel + 1) << 8;
1314
1315         /* build command table */
1316         commands = kzalloc(AT_NUM * (sizeof *commands), GFP_KERNEL);
1317         if (!commands)
1318                 goto oom;
1319
1320         /* encode parameter: Called party number */
1321         pp = cmsg->CalledPartyNumber;
1322         if (pp == NULL || *pp == 0) {
1323                 dev_notice(cs->dev, "%s: %s missing\n",
1324                            "CONNECT_REQ", "Called party number");
1325                 info = CapiIllMessageParmCoding;
1326                 goto error;
1327         }
1328         l = *pp++;
1329         /* check type of number/numbering plan byte */
1330         switch (*pp) {
1331         case 0x80:      /* unknown type / unknown numbering plan */
1332         case 0x81:      /* unknown type / ISDN/Telephony numbering plan */
1333                 break;
1334         default:        /* others: warn about potential misinterpretation */
1335                 dev_notice(cs->dev, "%s: %s type/plan 0x%02x unsupported\n",
1336                            "CONNECT_REQ", "Called party number", *pp);
1337         }
1338         pp++;
1339         l--;
1340         /* translate "**" internal call prefix to CTP value */
1341         if (l >= 2 && pp[0] == '*' && pp[1] == '*') {
1342                 s = "^SCTP=0\r";
1343                 pp += 2;
1344                 l -= 2;
1345         } else {
1346                 s = "^SCTP=1\r";
1347         }
1348         commands[AT_TYPE] = kstrdup(s, GFP_KERNEL);
1349         if (!commands[AT_TYPE])
1350                 goto oom;
1351         commands[AT_DIAL] = kmalloc(l + 3, GFP_KERNEL);
1352         if (!commands[AT_DIAL])
1353                 goto oom;
1354         snprintf(commands[AT_DIAL], l + 3, "D%.*s\r", l, pp);
1355
1356         /* encode parameter: Calling party number */
1357         pp = cmsg->CallingPartyNumber;
1358         if (pp != NULL && *pp > 0) {
1359                 l = *pp++;
1360
1361                 /* check type of number/numbering plan byte */
1362                 /* ToDo: allow for/handle Ext=1? */
1363                 switch (*pp) {
1364                 case 0x00:      /* unknown type / unknown numbering plan */
1365                 case 0x01:      /* unknown type / ISDN/Telephony num. plan */
1366                         break;
1367                 default:
1368                         dev_notice(cs->dev,
1369                                    "%s: %s type/plan 0x%02x unsupported\n",
1370                                    "CONNECT_REQ", "Calling party number", *pp);
1371                 }
1372                 pp++;
1373                 l--;
1374
1375                 /* check presentation indicator */
1376                 if (!l) {
1377                         dev_notice(cs->dev, "%s: %s IE truncated\n",
1378                                    "CONNECT_REQ", "Calling party number");
1379                         info = CapiIllMessageParmCoding;
1380                         goto error;
1381                 }
1382                 switch (*pp & 0xfc) { /* ignore Screening indicator */
1383                 case 0x80:      /* Presentation allowed */
1384                         s = "^SCLIP=1\r";
1385                         break;
1386                 case 0xa0:      /* Presentation restricted */
1387                         s = "^SCLIP=0\r";
1388                         break;
1389                 default:
1390                         dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1391                                    "CONNECT_REQ",
1392                                    "Presentation/Screening indicator",
1393                                    *pp);
1394                         s = "^SCLIP=1\r";
1395                 }
1396                 commands[AT_CLIP] = kstrdup(s, GFP_KERNEL);
1397                 if (!commands[AT_CLIP])
1398                         goto oom;
1399                 pp++;
1400                 l--;
1401
1402                 if (l) {
1403                         /* number */
1404                         commands[AT_MSN] = kmalloc(l + 8, GFP_KERNEL);
1405                         if (!commands[AT_MSN])
1406                                 goto oom;
1407                         snprintf(commands[AT_MSN], l + 8, "^SMSN=%*s\r", l, pp);
1408                 }
1409         }
1410
1411         /* check parameter: CIP Value */
1412         if (cmsg->CIPValue >= ARRAY_SIZE(cip2bchlc) ||
1413             (cmsg->CIPValue > 0 && cip2bchlc[cmsg->CIPValue].bc == NULL)) {
1414                 dev_notice(cs->dev, "%s: unknown CIP value %d\n",
1415                            "CONNECT_REQ", cmsg->CIPValue);
1416                 info = CapiCipValueUnknown;
1417                 goto error;
1418         }
1419
1420         /*
1421          * check/encode parameters: BC & HLC
1422          * must be encoded together as device doesn't accept HLC separately
1423          * explicit parameters override values derived from CIP
1424          */
1425
1426         /* determine lengths */
1427         if (cmsg->BC && cmsg->BC[0])            /* BC specified explicitly */
1428                 lbc = 2 * cmsg->BC[0];
1429         else if (cip2bchlc[cmsg->CIPValue].bc)  /* BC derived from CIP */
1430                 lbc = strlen(cip2bchlc[cmsg->CIPValue].bc);
1431         else                                    /* no BC */
1432                 lbc = 0;
1433         if (cmsg->HLC && cmsg->HLC[0])          /* HLC specified explicitly */
1434                 lhlc = 2 * cmsg->HLC[0];
1435         else if (cip2bchlc[cmsg->CIPValue].hlc) /* HLC derived from CIP */
1436                 lhlc = strlen(cip2bchlc[cmsg->CIPValue].hlc);
1437         else                                    /* no HLC */
1438                 lhlc = 0;
1439
1440         if (lbc) {
1441                 /* have BC: allocate and assemble command string */
1442                 l = lbc + 7;            /* "^SBC=" + value + "\r" + null byte */
1443                 if (lhlc)
1444                         l += lhlc + 7;  /* ";^SHLC=" + value */
1445                 commands[AT_BC] = kmalloc(l, GFP_KERNEL);
1446                 if (!commands[AT_BC])
1447                         goto oom;
1448                 strcpy(commands[AT_BC], "^SBC=");
1449                 if (cmsg->BC && cmsg->BC[0])    /* BC specified explicitly */
1450                         decode_ie(cmsg->BC, commands[AT_BC] + 5);
1451                 else                            /* BC derived from CIP */
1452                         strcpy(commands[AT_BC] + 5,
1453                                cip2bchlc[cmsg->CIPValue].bc);
1454                 if (lhlc) {
1455                         strcpy(commands[AT_BC] + lbc + 5, ";^SHLC=");
1456                         if (cmsg->HLC && cmsg->HLC[0])
1457                                 /* HLC specified explicitly */
1458                                 decode_ie(cmsg->HLC,
1459                                           commands[AT_BC] + lbc + 12);
1460                         else    /* HLC derived from CIP */
1461                                 strcpy(commands[AT_BC] + lbc + 12,
1462                                        cip2bchlc[cmsg->CIPValue].hlc);
1463                 }
1464                 strcpy(commands[AT_BC] + l - 2, "\r");
1465         } else {
1466                 /* no BC */
1467                 if (lhlc) {
1468                         dev_notice(cs->dev, "%s: cannot set HLC without BC\n",
1469                                    "CONNECT_REQ");
1470                         info = CapiIllMessageParmCoding; /* ? */
1471                         goto error;
1472                 }
1473         }
1474
1475         /* check/encode parameter: B Protocol */
1476         if (cmsg->BProtocol == CAPI_DEFAULT) {
1477                 bcs->proto2 = L2_HDLC;
1478                 dev_warn(cs->dev,
1479                          "B2 Protocol X.75 SLP unsupported, using Transparent\n");
1480         } else {
1481                 switch (cmsg->B1protocol) {
1482                 case 0:
1483                         bcs->proto2 = L2_HDLC;
1484                         break;
1485                 case 1:
1486                         bcs->proto2 = L2_VOICE;
1487                         break;
1488                 default:
1489                         dev_warn(cs->dev,
1490                                  "B1 Protocol %u unsupported, using Transparent\n",
1491                                  cmsg->B1protocol);
1492                         bcs->proto2 = L2_VOICE;
1493                 }
1494                 if (cmsg->B2protocol != 1)
1495                         dev_warn(cs->dev,
1496                                  "B2 Protocol %u unsupported, using Transparent\n",
1497                                  cmsg->B2protocol);
1498                 if (cmsg->B3protocol != 0)
1499                         dev_warn(cs->dev,
1500                                  "B3 Protocol %u unsupported, using Transparent\n",
1501                                  cmsg->B3protocol);
1502                 ignore_cstruct_param(cs, cmsg->B1configuration,
1503                                      "CONNECT_REQ", "B1 Configuration");
1504                 ignore_cstruct_param(cs, cmsg->B2configuration,
1505                                      "CONNECT_REQ", "B2 Configuration");
1506                 ignore_cstruct_param(cs, cmsg->B3configuration,
1507                                      "CONNECT_REQ", "B3 Configuration");
1508         }
1509         commands[AT_PROTO] = kmalloc(9, GFP_KERNEL);
1510         if (!commands[AT_PROTO])
1511                 goto oom;
1512         snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
1513
1514         /* ToDo: check/encode remaining parameters */
1515         ignore_cstruct_param(cs, cmsg->CalledPartySubaddress,
1516                              "CONNECT_REQ", "Called pty subaddr");
1517         ignore_cstruct_param(cs, cmsg->CallingPartySubaddress,
1518                              "CONNECT_REQ", "Calling pty subaddr");
1519         ignore_cstruct_param(cs, cmsg->LLC,
1520                              "CONNECT_REQ", "LLC");
1521         if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
1522                 ignore_cstruct_param(cs, cmsg->BChannelinformation,
1523                                      "CONNECT_REQ", "B Channel Information");
1524                 ignore_cstruct_param(cs, cmsg->Keypadfacility,
1525                                      "CONNECT_REQ", "Keypad Facility");
1526                 ignore_cstruct_param(cs, cmsg->Useruserdata,
1527                                      "CONNECT_REQ", "User-User Data");
1528                 ignore_cstruct_param(cs, cmsg->Facilitydataarray,
1529                                      "CONNECT_REQ", "Facility Data Array");
1530         }
1531
1532         /* encode parameter: B channel to use */
1533         commands[AT_ISO] = kmalloc(9, GFP_KERNEL);
1534         if (!commands[AT_ISO])
1535                 goto oom;
1536         snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
1537                  (unsigned) bcs->channel + 1);
1538
1539         /* queue & schedule EV_DIAL event */
1540         if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
1541                                bcs->at_state.seq_index, NULL)) {
1542                 info = CAPI_MSGOSRESOURCEERR;
1543                 goto error;
1544         }
1545         gigaset_schedule_event(cs);
1546         send_conf(iif, ap, skb, CapiSuccess);
1547         return;
1548
1549 oom:
1550         dev_err(cs->dev, "%s: out of memory\n", __func__);
1551         info = CAPI_MSGOSRESOURCEERR;
1552 error:
1553         if (commands)
1554                 for (i = 0; i < AT_NUM; i++)
1555                         kfree(commands[i]);
1556         kfree(commands);
1557         gigaset_free_channel(bcs);
1558         send_conf(iif, ap, skb, info);
1559 }
1560
1561 /*
1562  * process CONNECT_RESP message
1563  * checks protocol parameters and queues an ACCEPT or HUP event
1564  */
1565 static void do_connect_resp(struct gigaset_capi_ctr *iif,
1566                             struct gigaset_capi_appl *ap,
1567                             struct sk_buff *skb)
1568 {
1569         struct cardstate *cs = iif->ctr.driverdata;
1570         _cmsg *cmsg = &iif->acmsg;
1571         struct bc_state *bcs;
1572         struct gigaset_capi_appl *oap;
1573         unsigned long flags;
1574         int channel;
1575
1576         /* decode message */
1577         capi_message2cmsg(cmsg, skb->data);
1578         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1579         dev_kfree_skb_any(skb);
1580
1581         /* extract and check channel number from PLCI */
1582         channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
1583         if (!channel || channel > cs->channels) {
1584                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1585                            "CONNECT_RESP", "PLCI", cmsg->adr.adrPLCI);
1586                 return;
1587         }
1588         bcs = cs->bcs + channel - 1;
1589
1590         switch (cmsg->Reject) {
1591         case 0:         /* Accept */
1592                 /* drop all competing applications, keep only this one */
1593                 spin_lock_irqsave(&bcs->aplock, flags);
1594                 while (bcs->ap != NULL) {
1595                         oap = bcs->ap;
1596                         bcs->ap = oap->bcnext;
1597                         if (oap != ap) {
1598                                 spin_unlock_irqrestore(&bcs->aplock, flags);
1599                                 send_disconnect_ind(bcs, oap,
1600                                                     CapiCallGivenToOtherApplication);
1601                                 spin_lock_irqsave(&bcs->aplock, flags);
1602                         }
1603                 }
1604                 ap->bcnext = NULL;
1605                 bcs->ap = ap;
1606                 spin_unlock_irqrestore(&bcs->aplock, flags);
1607
1608                 bcs->rx_bufsize = ap->rp.datablklen;
1609                 dev_kfree_skb(bcs->rx_skb);
1610                 gigaset_new_rx_skb(bcs);
1611                 bcs->chstate |= CHS_NOTIFY_LL;
1612
1613                 /* check/encode B channel protocol */
1614                 if (cmsg->BProtocol == CAPI_DEFAULT) {
1615                         bcs->proto2 = L2_HDLC;
1616                         dev_warn(cs->dev,
1617                                  "B2 Protocol X.75 SLP unsupported, using Transparent\n");
1618                 } else {
1619                         switch (cmsg->B1protocol) {
1620                         case 0:
1621                                 bcs->proto2 = L2_HDLC;
1622                                 break;
1623                         case 1:
1624                                 bcs->proto2 = L2_VOICE;
1625                                 break;
1626                         default:
1627                                 dev_warn(cs->dev,
1628                                          "B1 Protocol %u unsupported, using Transparent\n",
1629                                          cmsg->B1protocol);
1630                                 bcs->proto2 = L2_VOICE;
1631                         }
1632                         if (cmsg->B2protocol != 1)
1633                                 dev_warn(cs->dev,
1634                                          "B2 Protocol %u unsupported, using Transparent\n",
1635                                          cmsg->B2protocol);
1636                         if (cmsg->B3protocol != 0)
1637                                 dev_warn(cs->dev,
1638                                          "B3 Protocol %u unsupported, using Transparent\n",
1639                                          cmsg->B3protocol);
1640                         ignore_cstruct_param(cs, cmsg->B1configuration,
1641                                              "CONNECT_RESP", "B1 Configuration");
1642                         ignore_cstruct_param(cs, cmsg->B2configuration,
1643                                              "CONNECT_RESP", "B2 Configuration");
1644                         ignore_cstruct_param(cs, cmsg->B3configuration,
1645                                              "CONNECT_RESP", "B3 Configuration");
1646                 }
1647
1648                 /* ToDo: check/encode remaining parameters */
1649                 ignore_cstruct_param(cs, cmsg->ConnectedNumber,
1650                                      "CONNECT_RESP", "Connected Number");
1651                 ignore_cstruct_param(cs, cmsg->ConnectedSubaddress,
1652                                      "CONNECT_RESP", "Connected Subaddress");
1653                 ignore_cstruct_param(cs, cmsg->LLC,
1654                                      "CONNECT_RESP", "LLC");
1655                 if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
1656                         ignore_cstruct_param(cs, cmsg->BChannelinformation,
1657                                              "CONNECT_RESP", "BChannel Information");
1658                         ignore_cstruct_param(cs, cmsg->Keypadfacility,
1659                                              "CONNECT_RESP", "Keypad Facility");
1660                         ignore_cstruct_param(cs, cmsg->Useruserdata,
1661                                              "CONNECT_RESP", "User-User Data");
1662                         ignore_cstruct_param(cs, cmsg->Facilitydataarray,
1663                                              "CONNECT_RESP", "Facility Data Array");
1664                 }
1665
1666                 /* Accept call */
1667                 if (!gigaset_add_event(cs, &cs->bcs[channel - 1].at_state,
1668                                        EV_ACCEPT, NULL, 0, NULL))
1669                         return;
1670                 gigaset_schedule_event(cs);
1671                 return;
1672
1673         case 1:                 /* Ignore */
1674                 /* send DISCONNECT_IND to this application */
1675                 send_disconnect_ind(bcs, ap, 0);
1676
1677                 /* remove it from the list of listening apps */
1678                 spin_lock_irqsave(&bcs->aplock, flags);
1679                 if (bcs->ap == ap) {
1680                         bcs->ap = ap->bcnext;
1681                         if (bcs->ap == NULL) {
1682                                 /* last one: stop ev-layer hupD notifications */
1683                                 bcs->apconnstate = APCONN_NONE;
1684                                 bcs->chstate &= ~CHS_NOTIFY_LL;
1685                         }
1686                         spin_unlock_irqrestore(&bcs->aplock, flags);
1687                         return;
1688                 }
1689                 for (oap = bcs->ap; oap != NULL; oap = oap->bcnext) {
1690                         if (oap->bcnext == ap) {
1691                                 oap->bcnext = oap->bcnext->bcnext;
1692                                 spin_unlock_irqrestore(&bcs->aplock, flags);
1693                                 return;
1694                         }
1695                 }
1696                 spin_unlock_irqrestore(&bcs->aplock, flags);
1697                 dev_err(cs->dev, "%s: application %u not found\n",
1698                         __func__, ap->id);
1699                 return;
1700
1701         default:                /* Reject */
1702                 /* drop all competing applications, keep only this one */
1703                 spin_lock_irqsave(&bcs->aplock, flags);
1704                 while (bcs->ap != NULL) {
1705                         oap = bcs->ap;
1706                         bcs->ap = oap->bcnext;
1707                         if (oap != ap) {
1708                                 spin_unlock_irqrestore(&bcs->aplock, flags);
1709                                 send_disconnect_ind(bcs, oap,
1710                                                     CapiCallGivenToOtherApplication);
1711                                 spin_lock_irqsave(&bcs->aplock, flags);
1712                         }
1713                 }
1714                 ap->bcnext = NULL;
1715                 bcs->ap = ap;
1716                 spin_unlock_irqrestore(&bcs->aplock, flags);
1717
1718                 /* reject call - will trigger DISCONNECT_IND for this app */
1719                 dev_info(cs->dev, "%s: Reject=%x\n",
1720                          "CONNECT_RESP", cmsg->Reject);
1721                 if (!gigaset_add_event(cs, &cs->bcs[channel - 1].at_state,
1722                                        EV_HUP, NULL, 0, NULL))
1723                         return;
1724                 gigaset_schedule_event(cs);
1725                 return;
1726         }
1727 }
1728
1729 /*
1730  * process CONNECT_B3_REQ message
1731  * build NCCI and emit CONNECT_B3_CONF reply
1732  */
1733 static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
1734                               struct gigaset_capi_appl *ap,
1735                               struct sk_buff *skb)
1736 {
1737         struct cardstate *cs = iif->ctr.driverdata;
1738         _cmsg *cmsg = &iif->acmsg;
1739         struct bc_state *bcs;
1740         int channel;
1741
1742         /* decode message */
1743         capi_message2cmsg(cmsg, skb->data);
1744         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1745
1746         /* extract and check channel number from PLCI */
1747         channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
1748         if (!channel || channel > cs->channels) {
1749                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1750                            "CONNECT_B3_REQ", "PLCI", cmsg->adr.adrPLCI);
1751                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1752                 return;
1753         }
1754         bcs = &cs->bcs[channel - 1];
1755
1756         /* mark logical connection active */
1757         bcs->apconnstate = APCONN_ACTIVE;
1758
1759         /* build NCCI: always 1 (one B3 connection only) */
1760         cmsg->adr.adrNCCI |= 1 << 16;
1761
1762         /* NCPI parameter: not applicable for B3 Transparent */
1763         ignore_cstruct_param(cs, cmsg->NCPI, "CONNECT_B3_REQ", "NCPI");
1764         send_conf(iif, ap, skb,
1765                   (cmsg->NCPI && cmsg->NCPI[0]) ?
1766                   CapiNcpiNotSupportedByProtocol : CapiSuccess);
1767 }
1768
1769 /*
1770  * process CONNECT_B3_RESP message
1771  * Depending on the Reject parameter, either emit CONNECT_B3_ACTIVE_IND
1772  * or queue EV_HUP and emit DISCONNECT_B3_IND.
1773  * The emitted message is always shorter than the received one,
1774  * allowing to reuse the skb.
1775  */
1776 static void do_connect_b3_resp(struct gigaset_capi_ctr *iif,
1777                                struct gigaset_capi_appl *ap,
1778                                struct sk_buff *skb)
1779 {
1780         struct cardstate *cs = iif->ctr.driverdata;
1781         _cmsg *cmsg = &iif->acmsg;
1782         struct bc_state *bcs;
1783         int channel;
1784         unsigned int msgsize;
1785         u8 command;
1786
1787         /* decode message */
1788         capi_message2cmsg(cmsg, skb->data);
1789         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1790
1791         /* extract and check channel number and NCCI */
1792         channel = (cmsg->adr.adrNCCI >> 8) & 0xff;
1793         if (!channel || channel > cs->channels ||
1794             ((cmsg->adr.adrNCCI >> 16) & 0xffff) != 1) {
1795                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1796                            "CONNECT_B3_RESP", "NCCI", cmsg->adr.adrNCCI);
1797                 dev_kfree_skb_any(skb);
1798                 return;
1799         }
1800         bcs = &cs->bcs[channel - 1];
1801
1802         if (cmsg->Reject) {
1803                 /* Reject: clear B3 connect received flag */
1804                 bcs->apconnstate = APCONN_SETUP;
1805
1806                 /* trigger hangup, causing eventual DISCONNECT_IND */
1807                 if (!gigaset_add_event(cs, &bcs->at_state,
1808                                        EV_HUP, NULL, 0, NULL)) {
1809                         dev_kfree_skb_any(skb);
1810                         return;
1811                 }
1812                 gigaset_schedule_event(cs);
1813
1814                 /* emit DISCONNECT_B3_IND */
1815                 command = CAPI_DISCONNECT_B3;
1816                 msgsize = CAPI_DISCONNECT_B3_IND_BASELEN;
1817         } else {
1818                 /*
1819                  * Accept: emit CONNECT_B3_ACTIVE_IND immediately, as
1820                  * we only send CONNECT_B3_IND if the B channel is up
1821                  */
1822                 command = CAPI_CONNECT_B3_ACTIVE;
1823                 msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
1824         }
1825         capi_cmsg_header(cmsg, ap->id, command, CAPI_IND,
1826                          ap->nextMessageNumber++, cmsg->adr.adrNCCI);
1827         __skb_trim(skb, msgsize);
1828         capi_cmsg2message(cmsg, skb->data);
1829         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1830         capi_ctr_handle_message(&iif->ctr, ap->id, skb);
1831 }
1832
1833 /*
1834  * process DISCONNECT_REQ message
1835  * schedule EV_HUP and emit DISCONNECT_B3_IND if necessary,
1836  * emit DISCONNECT_CONF reply
1837  */
1838 static void do_disconnect_req(struct gigaset_capi_ctr *iif,
1839                               struct gigaset_capi_appl *ap,
1840                               struct sk_buff *skb)
1841 {
1842         struct cardstate *cs = iif->ctr.driverdata;
1843         _cmsg *cmsg = &iif->acmsg;
1844         struct bc_state *bcs;
1845         _cmsg *b3cmsg;
1846         struct sk_buff *b3skb;
1847         int channel;
1848
1849         /* decode message */
1850         capi_message2cmsg(cmsg, skb->data);
1851         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1852
1853         /* extract and check channel number from PLCI */
1854         channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
1855         if (!channel || channel > cs->channels) {
1856                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1857                            "DISCONNECT_REQ", "PLCI", cmsg->adr.adrPLCI);
1858                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1859                 return;
1860         }
1861         bcs = cs->bcs + channel - 1;
1862
1863         /* ToDo: process parameter: Additional info */
1864         if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
1865                 ignore_cstruct_param(cs, cmsg->BChannelinformation,
1866                                      "DISCONNECT_REQ", "B Channel Information");
1867                 ignore_cstruct_param(cs, cmsg->Keypadfacility,
1868                                      "DISCONNECT_REQ", "Keypad Facility");
1869                 ignore_cstruct_param(cs, cmsg->Useruserdata,
1870                                      "DISCONNECT_REQ", "User-User Data");
1871                 ignore_cstruct_param(cs, cmsg->Facilitydataarray,
1872                                      "DISCONNECT_REQ", "Facility Data Array");
1873         }
1874
1875         /* skip if DISCONNECT_IND already sent */
1876         if (!bcs->apconnstate)
1877                 return;
1878
1879         /* check for active logical connection */
1880         if (bcs->apconnstate >= APCONN_ACTIVE) {
1881                 /* clear it */
1882                 bcs->apconnstate = APCONN_SETUP;
1883
1884                 /*
1885                  * emit DISCONNECT_B3_IND with cause 0x3301
1886                  * use separate cmsg structure, as the content of iif->acmsg
1887                  * is still needed for creating the _CONF message
1888                  */
1889                 b3cmsg = kmalloc(sizeof(*b3cmsg), GFP_KERNEL);
1890                 if (!b3cmsg) {
1891                         dev_err(cs->dev, "%s: out of memory\n", __func__);
1892                         send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1893                         return;
1894                 }
1895                 capi_cmsg_header(b3cmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
1896                                  ap->nextMessageNumber++,
1897                                  cmsg->adr.adrPLCI | (1 << 16));
1898                 b3cmsg->Reason_B3 = CapiProtocolErrorLayer1;
1899                 b3skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_KERNEL);
1900                 if (b3skb == NULL) {
1901                         dev_err(cs->dev, "%s: out of memory\n", __func__);
1902                         send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1903                         kfree(b3cmsg);
1904                         return;
1905                 }
1906                 capi_cmsg2message(b3cmsg,
1907                                   __skb_put(b3skb, CAPI_DISCONNECT_B3_IND_BASELEN));
1908                 dump_cmsg(DEBUG_CMD, __func__, b3cmsg);
1909                 kfree(b3cmsg);
1910                 capi_ctr_handle_message(&iif->ctr, ap->id, b3skb);
1911         }
1912
1913         /* trigger hangup, causing eventual DISCONNECT_IND */
1914         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
1915                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1916                 return;
1917         }
1918         gigaset_schedule_event(cs);
1919
1920         /* emit reply */
1921         send_conf(iif, ap, skb, CapiSuccess);
1922 }
1923
1924 /*
1925  * process DISCONNECT_B3_REQ message
1926  * schedule EV_HUP and emit DISCONNECT_B3_CONF reply
1927  */
1928 static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
1929                                  struct gigaset_capi_appl *ap,
1930                                  struct sk_buff *skb)
1931 {
1932         struct cardstate *cs = iif->ctr.driverdata;
1933         _cmsg *cmsg = &iif->acmsg;
1934         struct bc_state *bcs;
1935         int channel;
1936
1937         /* decode message */
1938         capi_message2cmsg(cmsg, skb->data);
1939         dump_cmsg(DEBUG_CMD, __func__, cmsg);
1940
1941         /* extract and check channel number and NCCI */
1942         channel = (cmsg->adr.adrNCCI >> 8) & 0xff;
1943         if (!channel || channel > cs->channels ||
1944             ((cmsg->adr.adrNCCI >> 16) & 0xffff) != 1) {
1945                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1946                            "DISCONNECT_B3_REQ", "NCCI", cmsg->adr.adrNCCI);
1947                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1948                 return;
1949         }
1950         bcs = &cs->bcs[channel - 1];
1951
1952         /* reject if logical connection not active */
1953         if (bcs->apconnstate < APCONN_ACTIVE) {
1954                 send_conf(iif, ap, skb,
1955                           CapiMessageNotSupportedInCurrentState);
1956                 return;
1957         }
1958
1959         /* trigger hangup, causing eventual DISCONNECT_B3_IND */
1960         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
1961                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
1962                 return;
1963         }
1964         gigaset_schedule_event(cs);
1965
1966         /* NCPI parameter: not applicable for B3 Transparent */
1967         ignore_cstruct_param(cs, cmsg->NCPI,
1968                              "DISCONNECT_B3_REQ", "NCPI");
1969         send_conf(iif, ap, skb,
1970                   (cmsg->NCPI && cmsg->NCPI[0]) ?
1971                   CapiNcpiNotSupportedByProtocol : CapiSuccess);
1972 }
1973
1974 /*
1975  * process DATA_B3_REQ message
1976  */
1977 static void do_data_b3_req(struct gigaset_capi_ctr *iif,
1978                            struct gigaset_capi_appl *ap,
1979                            struct sk_buff *skb)
1980 {
1981         struct cardstate *cs = iif->ctr.driverdata;
1982         struct bc_state *bcs;
1983         int channel = CAPIMSG_PLCI_PART(skb->data);
1984         u16 ncci = CAPIMSG_NCCI_PART(skb->data);
1985         u16 msglen = CAPIMSG_LEN(skb->data);
1986         u16 datalen = CAPIMSG_DATALEN(skb->data);
1987         u16 flags = CAPIMSG_FLAGS(skb->data);
1988         u16 msgid = CAPIMSG_MSGID(skb->data);
1989         u16 handle = CAPIMSG_HANDLE_REQ(skb->data);
1990
1991         /* frequent message, avoid _cmsg overhead */
1992         dump_rawmsg(DEBUG_MCMD, __func__, skb->data);
1993
1994         /* check parameters */
1995         if (channel == 0 || channel > cs->channels || ncci != 1) {
1996                 dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
1997                            "DATA_B3_REQ", "NCCI", CAPIMSG_NCCI(skb->data));
1998                 send_conf(iif, ap, skb, CapiIllContrPlciNcci);
1999                 return;
2000         }
2001         bcs = &cs->bcs[channel - 1];
2002         if (msglen != CAPI_DATA_B3_REQ_LEN && msglen != CAPI_DATA_B3_REQ_LEN64)
2003                 dev_notice(cs->dev, "%s: unexpected length %d\n",
2004                            "DATA_B3_REQ", msglen);
2005         if (msglen + datalen != skb->len)
2006                 dev_notice(cs->dev, "%s: length mismatch (%d+%d!=%d)\n",
2007                            "DATA_B3_REQ", msglen, datalen, skb->len);
2008         if (msglen + datalen > skb->len) {
2009                 /* message too short for announced data length */
2010                 send_conf(iif, ap, skb, CapiIllMessageParmCoding); /* ? */
2011                 return;
2012         }
2013         if (flags & CAPI_FLAGS_RESERVED) {
2014                 dev_notice(cs->dev, "%s: reserved flags set (%x)\n",
2015                            "DATA_B3_REQ", flags);
2016                 send_conf(iif, ap, skb, CapiIllMessageParmCoding);
2017                 return;
2018         }
2019
2020         /* reject if logical connection not active */
2021         if (bcs->apconnstate < APCONN_ACTIVE) {
2022                 send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
2023                 return;
2024         }
2025
2026         /* pull CAPI message into link layer header */
2027         skb_reset_mac_header(skb);
2028         skb->mac_len = msglen;
2029         skb_pull(skb, msglen);
2030
2031         /* pass to device-specific module */
2032         if (cs->ops->send_skb(bcs, skb) < 0) {
2033                 send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
2034                 return;
2035         }
2036
2037         /*
2038          * DATA_B3_CONF will be sent by gigaset_skb_sent() only if "delivery
2039          * confirmation" bit is set; otherwise we have to send it now
2040          */
2041         if (!(flags & CAPI_FLAGS_DELIVERY_CONFIRMATION))
2042                 send_data_b3_conf(cs, &iif->ctr, ap->id, msgid, channel, handle,
2043                                   flags ? CapiFlagsNotSupportedByProtocol
2044                                   : CAPI_NOERROR);
2045 }
2046
2047 /*
2048  * process RESET_B3_REQ message
2049  * just always reply "not supported by current protocol"
2050  */
2051 static void do_reset_b3_req(struct gigaset_capi_ctr *iif,
2052                             struct gigaset_capi_appl *ap,
2053                             struct sk_buff *skb)
2054 {
2055         /* decode message */
2056         capi_message2cmsg(&iif->acmsg, skb->data);
2057         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
2058         send_conf(iif, ap, skb,
2059                   CapiResetProcedureNotSupportedByCurrentProtocol);
2060 }
2061
2062 /*
2063  * unsupported CAPI message handler
2064  */
2065 static void do_unsupported(struct gigaset_capi_ctr *iif,
2066                            struct gigaset_capi_appl *ap,
2067                            struct sk_buff *skb)
2068 {
2069         /* decode message */
2070         capi_message2cmsg(&iif->acmsg, skb->data);
2071         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
2072         send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
2073 }
2074
2075 /*
2076  * CAPI message handler: no-op
2077  */
2078 static void do_nothing(struct gigaset_capi_ctr *iif,
2079                        struct gigaset_capi_appl *ap,
2080                        struct sk_buff *skb)
2081 {
2082         /* decode message */
2083         capi_message2cmsg(&iif->acmsg, skb->data);
2084         dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
2085         dev_kfree_skb_any(skb);
2086 }
2087
2088 static void do_data_b3_resp(struct gigaset_capi_ctr *iif,
2089                             struct gigaset_capi_appl *ap,
2090                             struct sk_buff *skb)
2091 {
2092         dump_rawmsg(DEBUG_MCMD, __func__, skb->data);
2093         dev_kfree_skb_any(skb);
2094 }
2095
2096 /* table of outgoing CAPI message handlers with lookup function */
2097 typedef void (*capi_send_handler_t)(struct gigaset_capi_ctr *,
2098                                     struct gigaset_capi_appl *,
2099                                     struct sk_buff *);
2100
2101 static struct {
2102         u16 cmd;
2103         capi_send_handler_t handler;
2104 } capi_send_handler_table[] = {
2105         /* most frequent messages first for faster lookup */
2106         { CAPI_DATA_B3_REQ, do_data_b3_req },
2107         { CAPI_DATA_B3_RESP, do_data_b3_resp },
2108
2109         { CAPI_ALERT_REQ, do_alert_req },
2110         { CAPI_CONNECT_ACTIVE_RESP, do_nothing },
2111         { CAPI_CONNECT_B3_ACTIVE_RESP, do_nothing },
2112         { CAPI_CONNECT_B3_REQ, do_connect_b3_req },
2113         { CAPI_CONNECT_B3_RESP, do_connect_b3_resp },
2114         { CAPI_CONNECT_B3_T90_ACTIVE_RESP, do_nothing },
2115         { CAPI_CONNECT_REQ, do_connect_req },
2116         { CAPI_CONNECT_RESP, do_connect_resp },
2117         { CAPI_DISCONNECT_B3_REQ, do_disconnect_b3_req },
2118         { CAPI_DISCONNECT_B3_RESP, do_nothing },
2119         { CAPI_DISCONNECT_REQ, do_disconnect_req },
2120         { CAPI_DISCONNECT_RESP, do_nothing },
2121         { CAPI_FACILITY_REQ, do_facility_req },
2122         { CAPI_FACILITY_RESP, do_nothing },
2123         { CAPI_LISTEN_REQ, do_listen_req },
2124         { CAPI_SELECT_B_PROTOCOL_REQ, do_unsupported },
2125         { CAPI_RESET_B3_REQ, do_reset_b3_req },
2126         { CAPI_RESET_B3_RESP, do_nothing },
2127
2128         /*
2129          * ToDo: support overlap sending (requires ev-layer state
2130          * machine extension to generate additional ATD commands)
2131          */
2132         { CAPI_INFO_REQ, do_unsupported },
2133         { CAPI_INFO_RESP, do_nothing },
2134
2135         /*
2136          * ToDo: what's the proper response for these?
2137          */
2138         { CAPI_MANUFACTURER_REQ, do_nothing },
2139         { CAPI_MANUFACTURER_RESP, do_nothing },
2140 };
2141
2142 /* look up handler */
2143 static inline capi_send_handler_t lookup_capi_send_handler(const u16 cmd)
2144 {
2145         size_t i;
2146
2147         for (i = 0; i < ARRAY_SIZE(capi_send_handler_table); i++)
2148                 if (capi_send_handler_table[i].cmd == cmd)
2149                         return capi_send_handler_table[i].handler;
2150         return NULL;
2151 }
2152
2153
2154 /**
2155  * gigaset_send_message() - accept a CAPI message from an application
2156  * @ctr:        controller descriptor structure.
2157  * @skb:        CAPI message.
2158  *
2159  * Return value: CAPI error code
2160  * Note: capidrv (and probably others, too) only uses the return value to
2161  * decide whether it has to free the skb (only if result != CAPI_NOERROR (0))
2162  */
2163 static u16 gigaset_send_message(struct capi_ctr *ctr, struct sk_buff *skb)
2164 {
2165         struct gigaset_capi_ctr *iif
2166                 = container_of(ctr, struct gigaset_capi_ctr, ctr);
2167         struct cardstate *cs = ctr->driverdata;
2168         struct gigaset_capi_appl *ap;
2169         capi_send_handler_t handler;
2170
2171         /* can only handle linear sk_buffs */
2172         if (skb_linearize(skb) < 0) {
2173                 dev_warn(cs->dev, "%s: skb_linearize failed\n", __func__);
2174                 return CAPI_MSGOSRESOURCEERR;
2175         }
2176
2177         /* retrieve application data structure */
2178         ap = get_appl(iif, CAPIMSG_APPID(skb->data));
2179         if (!ap) {
2180                 dev_notice(cs->dev, "%s: application %u not registered\n",
2181                            __func__, CAPIMSG_APPID(skb->data));
2182                 return CAPI_ILLAPPNR;
2183         }
2184
2185         /* look up command */
2186         handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
2187         if (!handler) {
2188                 /* unknown/unsupported message type */
2189                 if (printk_ratelimit())
2190                         dev_notice(cs->dev, "%s: unsupported message %u\n",
2191                                    __func__, CAPIMSG_CMD(skb->data));
2192                 return CAPI_ILLCMDORSUBCMDORMSGTOSMALL;
2193         }
2194
2195         /* serialize */
2196         if (atomic_add_return(1, &iif->sendqlen) > 1) {
2197                 /* queue behind other messages */
2198                 skb_queue_tail(&iif->sendqueue, skb);
2199                 return CAPI_NOERROR;
2200         }
2201
2202         /* process message */
2203         handler(iif, ap, skb);
2204
2205         /* process other messages arrived in the meantime */
2206         while (atomic_sub_return(1, &iif->sendqlen) > 0) {
2207                 skb = skb_dequeue(&iif->sendqueue);
2208                 if (!skb) {
2209                         /* should never happen */
2210                         dev_err(cs->dev, "%s: send queue empty\n", __func__);
2211                         continue;
2212                 }
2213                 ap = get_appl(iif, CAPIMSG_APPID(skb->data));
2214                 if (!ap) {
2215                         /* could that happen? */
2216                         dev_warn(cs->dev, "%s: application %u vanished\n",
2217                                  __func__, CAPIMSG_APPID(skb->data));
2218                         continue;
2219                 }
2220                 handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
2221                 if (!handler) {
2222                         /* should never happen */
2223                         dev_err(cs->dev, "%s: handler %x vanished\n",
2224                                 __func__, CAPIMSG_CMD(skb->data));
2225                         continue;
2226                 }
2227                 handler(iif, ap, skb);
2228         }
2229
2230         return CAPI_NOERROR;
2231 }
2232
2233 /**
2234  * gigaset_procinfo() - build single line description for controller
2235  * @ctr:        controller descriptor structure.
2236  *
2237  * Return value: pointer to generated string (null terminated)
2238  */
2239 static char *gigaset_procinfo(struct capi_ctr *ctr)
2240 {
2241         return ctr->name;       /* ToDo: more? */
2242 }
2243
2244 static int gigaset_proc_show(struct seq_file *m, void *v)
2245 {
2246         struct capi_ctr *ctr = m->private;
2247         struct cardstate *cs = ctr->driverdata;
2248         char *s;
2249         int i;
2250
2251         seq_printf(m, "%-16s %s\n", "name", ctr->name);
2252         seq_printf(m, "%-16s %s %s\n", "dev",
2253                    dev_driver_string(cs->dev), dev_name(cs->dev));
2254         seq_printf(m, "%-16s %d\n", "id", cs->myid);
2255         if (cs->gotfwver)
2256                 seq_printf(m, "%-16s %d.%d.%d.%d\n", "firmware",
2257                            cs->fwver[0], cs->fwver[1], cs->fwver[2], cs->fwver[3]);
2258         seq_printf(m, "%-16s %d\n", "channels", cs->channels);
2259         seq_printf(m, "%-16s %s\n", "onechannel", cs->onechannel ? "yes" : "no");
2260
2261         switch (cs->mode) {
2262         case M_UNKNOWN:
2263                 s = "unknown";
2264                 break;
2265         case M_CONFIG:
2266                 s = "config";
2267                 break;
2268         case M_UNIMODEM:
2269                 s = "Unimodem";
2270                 break;
2271         case M_CID:
2272                 s = "CID";
2273                 break;
2274         default:
2275                 s = "??";
2276         }
2277         seq_printf(m, "%-16s %s\n", "mode", s);
2278
2279         switch (cs->mstate) {
2280         case MS_UNINITIALIZED:
2281                 s = "uninitialized";
2282                 break;
2283         case MS_INIT:
2284                 s = "init";
2285                 break;
2286         case MS_LOCKED:
2287                 s = "locked";
2288                 break;
2289         case MS_SHUTDOWN:
2290                 s = "shutdown";
2291                 break;
2292         case MS_RECOVER:
2293                 s = "recover";
2294                 break;
2295         case MS_READY:
2296                 s = "ready";
2297                 break;
2298         default:
2299                 s = "??";
2300         }
2301         seq_printf(m, "%-16s %s\n", "mstate", s);
2302
2303         seq_printf(m, "%-16s %s\n", "running", cs->running ? "yes" : "no");
2304         seq_printf(m, "%-16s %s\n", "connected", cs->connected ? "yes" : "no");
2305         seq_printf(m, "%-16s %s\n", "isdn_up", cs->isdn_up ? "yes" : "no");
2306         seq_printf(m, "%-16s %s\n", "cidmode", cs->cidmode ? "yes" : "no");
2307
2308         for (i = 0; i < cs->channels; i++) {
2309                 seq_printf(m, "[%d]%-13s %d\n", i, "corrupted",
2310                            cs->bcs[i].corrupted);
2311                 seq_printf(m, "[%d]%-13s %d\n", i, "trans_down",
2312                            cs->bcs[i].trans_down);
2313                 seq_printf(m, "[%d]%-13s %d\n", i, "trans_up",
2314                            cs->bcs[i].trans_up);
2315                 seq_printf(m, "[%d]%-13s %d\n", i, "chstate",
2316                            cs->bcs[i].chstate);
2317                 switch (cs->bcs[i].proto2) {
2318                 case L2_BITSYNC:
2319                         s = "bitsync";
2320                         break;
2321                 case L2_HDLC:
2322                         s = "HDLC";
2323                         break;
2324                 case L2_VOICE:
2325                         s = "voice";
2326                         break;
2327                 default:
2328                         s = "??";
2329                 }
2330                 seq_printf(m, "[%d]%-13s %s\n", i, "proto2", s);
2331         }
2332         return 0;
2333 }
2334
2335 static int gigaset_proc_open(struct inode *inode, struct file *file)
2336 {
2337         return single_open(file, gigaset_proc_show, PDE_DATA(inode));
2338 }
2339
2340 static const struct file_operations gigaset_proc_fops = {
2341         .owner          = THIS_MODULE,
2342         .open           = gigaset_proc_open,
2343         .read           = seq_read,
2344         .llseek         = seq_lseek,
2345         .release        = single_release,
2346 };
2347
2348 /**
2349  * gigaset_isdn_regdev() - register device to LL
2350  * @cs:         device descriptor structure.
2351  * @isdnid:     device name.
2352  *
2353  * Return value: 0 on success, error code < 0 on failure
2354  */
2355 int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
2356 {
2357         struct gigaset_capi_ctr *iif;
2358         int rc;
2359
2360         iif = kmalloc(sizeof(*iif), GFP_KERNEL);
2361         if (!iif) {
2362                 pr_err("%s: out of memory\n", __func__);
2363                 return -ENOMEM;
2364         }
2365
2366         /* prepare controller structure */
2367         iif->ctr.owner         = THIS_MODULE;
2368         iif->ctr.driverdata    = cs;
2369         strncpy(iif->ctr.name, isdnid, sizeof(iif->ctr.name));
2370         iif->ctr.driver_name   = "gigaset";
2371         iif->ctr.load_firmware = NULL;
2372         iif->ctr.reset_ctr     = NULL;
2373         iif->ctr.register_appl = gigaset_register_appl;
2374         iif->ctr.release_appl  = gigaset_release_appl;
2375         iif->ctr.send_message  = gigaset_send_message;
2376         iif->ctr.procinfo      = gigaset_procinfo;
2377         iif->ctr.proc_fops = &gigaset_proc_fops;
2378         INIT_LIST_HEAD(&iif->appls);
2379         skb_queue_head_init(&iif->sendqueue);
2380         atomic_set(&iif->sendqlen, 0);
2381
2382         /* register controller with CAPI */
2383         rc = attach_capi_ctr(&iif->ctr);
2384         if (rc) {
2385                 pr_err("attach_capi_ctr failed (%d)\n", rc);
2386                 kfree(iif);
2387                 return rc;
2388         }
2389
2390         cs->iif = iif;
2391         cs->hw_hdr_len = CAPI_DATA_B3_REQ_LEN;
2392         return 0;
2393 }
2394
2395 /**
2396  * gigaset_isdn_unregdev() - unregister device from LL
2397  * @cs:         device descriptor structure.
2398  */
2399 void gigaset_isdn_unregdev(struct cardstate *cs)
2400 {
2401         struct gigaset_capi_ctr *iif = cs->iif;
2402
2403         detach_capi_ctr(&iif->ctr);
2404         kfree(iif);
2405         cs->iif = NULL;
2406 }
2407
2408 static struct capi_driver capi_driver_gigaset = {
2409         .name           = "gigaset",
2410         .revision       = "1.0",
2411 };
2412
2413 /**
2414  * gigaset_isdn_regdrv() - register driver to LL
2415  */
2416 void gigaset_isdn_regdrv(void)
2417 {
2418         pr_info("Kernel CAPI interface\n");
2419         register_capi_driver(&capi_driver_gigaset);
2420 }
2421
2422 /**
2423  * gigaset_isdn_unregdrv() - unregister driver from LL
2424  */
2425 void gigaset_isdn_unregdrv(void)
2426 {
2427         unregister_capi_driver(&capi_driver_gigaset);
2428 }