kernel/drivers/isdn/gigaset/ev-layer.c

   1 /*
   2  * Stuff used by all variants of the driver
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers,
   5  *                       Hansjoerg Lipp <hjlipp@web.de>,
   6  *                       Tilman Schmidt <tilman@imap.cc>.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include <linux/export.h>
  17 #include "gigaset.h"
  18
  19 /* ========================================================== */
  20 /* bit masks for pending commands */
  21 #define PC_DIAL         0x001
  22 #define PC_HUP          0x002
  23 #define PC_INIT         0x004
  24 #define PC_DLE0         0x008
  25 #define PC_DLE1         0x010
  26 #define PC_SHUTDOWN     0x020
  27 #define PC_ACCEPT       0x040
  28 #define PC_CID          0x080
  29 #define PC_NOCID        0x100
  30 #define PC_CIDMODE      0x200
  31 #define PC_UMMODE       0x400
  32
  33 /* types of modem responses */
  34 #define RT_NOTHING      0
  35 #define RT_ZSAU         1
  36 #define RT_RING         2
  37 #define RT_NUMBER       3
  38 #define RT_STRING       4
  39 #define RT_ZCAU         6
  40
  41 /* Possible ASCII responses */
  42 #define RSP_OK          0
  43 #define RSP_ERROR       1
  44 #define RSP_ZGCI        3
  45 #define RSP_RING        4
  46 #define RSP_ZVLS        5
  47 #define RSP_ZCAU        6
  48
  49 /* responses with values to store in at_state */
  50 /* - numeric */
  51 #define RSP_VAR         100
  52 #define RSP_ZSAU        (RSP_VAR + VAR_ZSAU)
  53 #define RSP_ZDLE        (RSP_VAR + VAR_ZDLE)
  54 #define RSP_ZCTP        (RSP_VAR + VAR_ZCTP)
  55 /* - string */
  56 #define RSP_STR         (RSP_VAR + VAR_NUM)
  57 #define RSP_NMBR        (RSP_STR + STR_NMBR)
  58 #define RSP_ZCPN        (RSP_STR + STR_ZCPN)
  59 #define RSP_ZCON        (RSP_STR + STR_ZCON)
  60 #define RSP_ZBC         (RSP_STR + STR_ZBC)
  61 #define RSP_ZHLC        (RSP_STR + STR_ZHLC)
  62
  63 #define RSP_WRONG_CID   -2      /* unknown cid in cmd */
  64 #define RSP_INVAL       -6      /* invalid response   */
  65 #define RSP_NODEV       -9      /* device not connected */
  66
  67 #define RSP_NONE        -19
  68 #define RSP_STRING      -20
  69 #define RSP_NULL        -21
  70 #define RSP_INIT        -27
  71 #define RSP_ANY         -26
  72 #define RSP_LAST        -28
  73
  74 /* actions for process_response */
  75 #define ACT_NOTHING             0
  76 #define ACT_SETDLE1             1
  77 #define ACT_SETDLE0             2
  78 #define ACT_FAILINIT            3
  79 #define ACT_HUPMODEM            4
  80 #define ACT_CONFIGMODE          5
  81 #define ACT_INIT                6
  82 #define ACT_DLE0                7
  83 #define ACT_DLE1                8
  84 #define ACT_FAILDLE0            9
  85 #define ACT_FAILDLE1            10
  86 #define ACT_RING                11
  87 #define ACT_CID                 12
  88 #define ACT_FAILCID             13
  89 #define ACT_SDOWN               14
  90 #define ACT_FAILSDOWN           15
  91 #define ACT_DEBUG               16
  92 #define ACT_WARN                17
  93 #define ACT_DIALING             18
  94 #define ACT_ABORTDIAL           19
  95 #define ACT_DISCONNECT          20
  96 #define ACT_CONNECT             21
  97 #define ACT_REMOTEREJECT        22
  98 #define ACT_CONNTIMEOUT         23
  99 #define ACT_REMOTEHUP           24
 100 #define ACT_ABORTHUP            25
 101 #define ACT_ICALL               26
 102 #define ACT_ACCEPTED            27
 103 #define ACT_ABORTACCEPT         28
 104 #define ACT_TIMEOUT             29
 105 #define ACT_GETSTRING           30
 106 #define ACT_SETVER              31
 107 #define ACT_FAILVER             32
 108 #define ACT_GOTVER              33
 109 #define ACT_TEST                34
 110 #define ACT_ERROR               35
 111 #define ACT_ABORTCID            36
 112 #define ACT_ZCAU                37
 113 #define ACT_NOTIFY_BC_DOWN      38
 114 #define ACT_NOTIFY_BC_UP        39
 115 #define ACT_DIAL                40
 116 #define ACT_ACCEPT              41
 117 #define ACT_HUP                 43
 118 #define ACT_IF_LOCK             44
 119 #define ACT_START               45
 120 #define ACT_STOP                46
 121 #define ACT_FAKEDLE0            47
 122 #define ACT_FAKEHUP             48
 123 #define ACT_FAKESDOWN           49
 124 #define ACT_SHUTDOWN            50
 125 #define ACT_PROC_CIDMODE        51
 126 #define ACT_UMODESET            52
 127 #define ACT_FAILUMODE           53
 128 #define ACT_CMODESET            54
 129 #define ACT_FAILCMODE           55
 130 #define ACT_IF_VER              56
 131 #define ACT_CMD                 100
 132
 133 /* at command sequences */
 134 #define SEQ_NONE        0
 135 #define SEQ_INIT        100
 136 #define SEQ_DLE0        200
 137 #define SEQ_DLE1        250
 138 #define SEQ_CID         300
 139 #define SEQ_NOCID       350
 140 #define SEQ_HUP         400
 141 #define SEQ_DIAL        600
 142 #define SEQ_ACCEPT      720
 143 #define SEQ_SHUTDOWN    500
 144 #define SEQ_CIDMODE     10
 145 #define SEQ_UMMODE      11
 146
 147
 148 /* 100: init, 200: dle0, 250:dle1, 300: get cid (dial), 350: "hup" (no cid),
 149  * 400: hup, 500: reset, 600: dial, 700: ring */
 150 struct reply_t gigaset_tab_nocid[] =
 151 {
 152 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
 153  * action, command */
 154
 155 /* initialize device, set cid mode if possible */
 156         {RSP_INIT,       -1,  -1, SEQ_INIT,     100,  1, {ACT_TIMEOUT} },
 157
 158         {EV_TIMEOUT,    100, 100, -1,           101,  3, {0},   "Z\r"},
 159         {RSP_OK,        101, 103, -1,           120,  5, {ACT_GETSTRING},
 160                                                                 "+GMR\r"},
 161
 162         {EV_TIMEOUT,    101, 101, -1,           102,  5, {0},   "Z\r"},
 163         {RSP_ERROR,     101, 101, -1,           102,  5, {0},   "Z\r"},
 164
 165         {EV_TIMEOUT,    102, 102, -1,           108,  5, {ACT_SETDLE1},
 166                                                                 "^SDLE=0\r"},
 167         {RSP_OK,        108, 108, -1,           104, -1},
 168         {RSP_ZDLE,      104, 104,  0,           103,  5, {0},   "Z\r"},
 169         {EV_TIMEOUT,    104, 104, -1,             0,  0, {ACT_FAILINIT} },
 170         {RSP_ERROR,     108, 108, -1,             0,  0, {ACT_FAILINIT} },
 171
 172         {EV_TIMEOUT,    108, 108, -1,           105,  2, {ACT_SETDLE0,
 173                                                           ACT_HUPMODEM,
 174                                                           ACT_TIMEOUT} },
 175         {EV_TIMEOUT,    105, 105, -1,           103,  5, {0},   "Z\r"},
 176
 177         {RSP_ERROR,     102, 102, -1,           107,  5, {0},   "^GETPRE\r"},
 178         {RSP_OK,        107, 107, -1,             0,  0, {ACT_CONFIGMODE} },
 179         {RSP_ERROR,     107, 107, -1,             0,  0, {ACT_FAILINIT} },
 180         {EV_TIMEOUT,    107, 107, -1,             0,  0, {ACT_FAILINIT} },
 181
 182         {RSP_ERROR,     103, 103, -1,             0,  0, {ACT_FAILINIT} },
 183         {EV_TIMEOUT,    103, 103, -1,             0,  0, {ACT_FAILINIT} },
 184
 185         {RSP_STRING,    120, 120, -1,           121, -1, {ACT_SETVER} },
 186
 187         {EV_TIMEOUT,    120, 121, -1,             0,  0, {ACT_FAILVER,
 188                                                           ACT_INIT} },
 189         {RSP_ERROR,     120, 121, -1,             0,  0, {ACT_FAILVER,
 190                                                           ACT_INIT} },
 191         {RSP_OK,        121, 121, -1,             0,  0, {ACT_GOTVER,
 192                                                           ACT_INIT} },
 193         {RSP_NONE,      121, 121, -1,           120,  0, {ACT_GETSTRING} },
 194
 195 /* leave dle mode */
 196         {RSP_INIT,        0,   0, SEQ_DLE0,     201,  5, {0},   "^SDLE=0\r"},
 197         {RSP_OK,        201, 201, -1,           202, -1},
 198         {RSP_ZDLE,      202, 202,  0,             0,  0, {ACT_DLE0} },
 199         {RSP_NODEV,     200, 249, -1,             0,  0, {ACT_FAKEDLE0} },
 200         {RSP_ERROR,     200, 249, -1,             0,  0, {ACT_FAILDLE0} },
 201         {EV_TIMEOUT,    200, 249, -1,             0,  0, {ACT_FAILDLE0} },
 202
 203 /* enter dle mode */
 204         {RSP_INIT,        0,   0, SEQ_DLE1,     251,  5, {0},   "^SDLE=1\r"},
 205         {RSP_OK,        251, 251, -1,           252, -1},
 206         {RSP_ZDLE,      252, 252,  1,             0,  0, {ACT_DLE1} },
 207         {RSP_ERROR,     250, 299, -1,             0,  0, {ACT_FAILDLE1} },
 208         {EV_TIMEOUT,    250, 299, -1,             0,  0, {ACT_FAILDLE1} },
 209
 210 /* incoming call */
 211         {RSP_RING,       -1,  -1, -1,            -1, -1, {ACT_RING} },
 212
 213 /* get cid */
 214         {RSP_INIT,        0,   0, SEQ_CID,      301,  5, {0},   "^SGCI?\r"},
 215         {RSP_OK,        301, 301, -1,           302, -1},
 216         {RSP_ZGCI,      302, 302, -1,             0,  0, {ACT_CID} },
 217         {RSP_ERROR,     301, 349, -1,             0,  0, {ACT_FAILCID} },
 218         {EV_TIMEOUT,    301, 349, -1,             0,  0, {ACT_FAILCID} },
 219
 220 /* enter cid mode */
 221         {RSP_INIT,        0,   0, SEQ_CIDMODE,  150,  5, {0},   "^SGCI=1\r"},
 222         {RSP_OK,        150, 150, -1,             0,  0, {ACT_CMODESET} },
 223         {RSP_ERROR,     150, 150, -1,             0,  0, {ACT_FAILCMODE} },
 224         {EV_TIMEOUT,    150, 150, -1,             0,  0, {ACT_FAILCMODE} },
 225
 226 /* leave cid mode */
 227         {RSP_INIT,        0,   0, SEQ_UMMODE,   160,  5, {0},   "Z\r"},
 228         {RSP_OK,        160, 160, -1,             0,  0, {ACT_UMODESET} },
 229         {RSP_ERROR,     160, 160, -1,             0,  0, {ACT_FAILUMODE} },
 230         {EV_TIMEOUT,    160, 160, -1,             0,  0, {ACT_FAILUMODE} },
 231
 232 /* abort getting cid */
 233         {RSP_INIT,        0,   0, SEQ_NOCID,      0,  0, {ACT_ABORTCID} },
 234
 235 /* reset */
 236         {RSP_INIT,        0,   0, SEQ_SHUTDOWN, 504,  5, {0},   "Z\r"},
 237         {RSP_OK,        504, 504, -1,             0,  0, {ACT_SDOWN} },
 238         {RSP_ERROR,     501, 599, -1,             0,  0, {ACT_FAILSDOWN} },
 239         {EV_TIMEOUT,    501, 599, -1,             0,  0, {ACT_FAILSDOWN} },
 240         {RSP_NODEV,     501, 599, -1,             0,  0, {ACT_FAKESDOWN} },
 241
 242         {EV_PROC_CIDMODE, -1, -1, -1,            -1, -1, {ACT_PROC_CIDMODE} },
 243         {EV_IF_LOCK,     -1,  -1, -1,            -1, -1, {ACT_IF_LOCK} },
 244         {EV_IF_VER,      -1,  -1, -1,            -1, -1, {ACT_IF_VER} },
 245         {EV_START,       -1,  -1, -1,            -1, -1, {ACT_START} },
 246         {EV_STOP,        -1,  -1, -1,            -1, -1, {ACT_STOP} },
 247         {EV_SHUTDOWN,    -1,  -1, -1,            -1, -1, {ACT_SHUTDOWN} },
 248
 249 /* misc. */
 250         {RSP_ERROR,      -1,  -1, -1,            -1, -1, {ACT_ERROR} },
 251         {RSP_ZCAU,       -1,  -1, -1,            -1, -1, {ACT_ZCAU} },
 252         {RSP_NONE,       -1,  -1, -1,            -1, -1, {ACT_DEBUG} },
 253         {RSP_ANY,        -1,  -1, -1,            -1, -1, {ACT_WARN} },
 254         {RSP_LAST}
 255 };
 256
 257 /* 600: start dialing, 650: dial in progress, 800: connection is up, 700: ring,
 258  * 400: hup, 750: accepted icall */
 259 struct reply_t gigaset_tab_cid[] =
 260 {
 261 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
 262  * action, command */
 263
 264 /* dial */
 265         {EV_DIAL,        -1,  -1, -1,            -1, -1, {ACT_DIAL} },
 266         {RSP_INIT,        0,   0, SEQ_DIAL,     601,  5, {ACT_CMD + AT_BC} },
 267         {RSP_OK,        601, 601, -1,           603,  5, {ACT_CMD + AT_PROTO} },
 268         {RSP_OK,        603, 603, -1,           604,  5, {ACT_CMD + AT_TYPE} },
 269         {RSP_OK,        604, 604, -1,           605,  5, {ACT_CMD + AT_MSN} },
 270         {RSP_NULL,      605, 605, -1,           606,  5, {ACT_CMD + AT_CLIP} },
 271         {RSP_OK,        605, 605, -1,           606,  5, {ACT_CMD + AT_CLIP} },
 272         {RSP_NULL,      606, 606, -1,           607,  5, {ACT_CMD + AT_ISO} },
 273         {RSP_OK,        606, 606, -1,           607,  5, {ACT_CMD + AT_ISO} },
 274         {RSP_OK,        607, 607, -1,           608,  5, {0},   "+VLS=17\r"},
 275         {RSP_OK,        608, 608, -1,           609, -1},
 276         {RSP_ZSAU,      609, 609, ZSAU_PROCEEDING, 610, 5, {ACT_CMD + AT_DIAL} },
 277         {RSP_OK,        610, 610, -1,           650,  0, {ACT_DIALING} },
 278
 279         {RSP_ERROR,     601, 610, -1,             0,  0, {ACT_ABORTDIAL} },
 280         {EV_TIMEOUT,    601, 610, -1,             0,  0, {ACT_ABORTDIAL} },
 281
 282 /* optional dialing responses */
 283         {EV_BC_OPEN,    650, 650, -1,           651, -1},
 284         {RSP_ZVLS,      609, 651, 17,            -1, -1, {ACT_DEBUG} },
 285         {RSP_ZCTP,      610, 651, -1,            -1, -1, {ACT_DEBUG} },
 286         {RSP_ZCPN,      610, 651, -1,            -1, -1, {ACT_DEBUG} },
 287         {RSP_ZSAU,      650, 651, ZSAU_CALL_DELIVERED, -1, -1, {ACT_DEBUG} },
 288
 289 /* connect */
 290         {RSP_ZSAU,      650, 650, ZSAU_ACTIVE,  800, -1, {ACT_CONNECT} },
 291         {RSP_ZSAU,      651, 651, ZSAU_ACTIVE,  800, -1, {ACT_CONNECT,
 292                                                           ACT_NOTIFY_BC_UP} },
 293         {RSP_ZSAU,      750, 750, ZSAU_ACTIVE,  800, -1, {ACT_CONNECT} },
 294         {RSP_ZSAU,      751, 751, ZSAU_ACTIVE,  800, -1, {ACT_CONNECT,
 295                                                           ACT_NOTIFY_BC_UP} },
 296         {EV_BC_OPEN,    800, 800, -1,           800, -1, {ACT_NOTIFY_BC_UP} },
 297
 298 /* remote hangup */
 299         {RSP_ZSAU,      650, 651, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEREJECT} },
 300         {RSP_ZSAU,      750, 751, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEHUP} },
 301         {RSP_ZSAU,      800, 800, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEHUP} },
 302
 303 /* hangup */
 304         {EV_HUP,         -1,  -1, -1,            -1, -1, {ACT_HUP} },
 305         {RSP_INIT,       -1,  -1, SEQ_HUP,      401,  5, {0},   "+VLS=0\r"},
 306         {RSP_OK,        401, 401, -1,           402,  5},
 307         {RSP_ZVLS,      402, 402,  0,           403,  5},
 308         {RSP_ZSAU,      403, 403, ZSAU_DISCONNECT_REQ, -1, -1, {ACT_DEBUG} },
 309         {RSP_ZSAU,      403, 403, ZSAU_NULL,      0,  0, {ACT_DISCONNECT} },
 310         {RSP_NODEV,     401, 403, -1,             0,  0, {ACT_FAKEHUP} },
 311         {RSP_ERROR,     401, 401, -1,             0,  0, {ACT_ABORTHUP} },
 312         {EV_TIMEOUT,    401, 403, -1,             0,  0, {ACT_ABORTHUP} },
 313
 314         {EV_BC_CLOSED,    0,   0, -1,             0, -1, {ACT_NOTIFY_BC_DOWN} },
 315
 316 /* ring */
 317         {RSP_ZBC,       700, 700, -1,            -1, -1, {0} },
 318         {RSP_ZHLC,      700, 700, -1,            -1, -1, {0} },
 319         {RSP_NMBR,      700, 700, -1,            -1, -1, {0} },
 320         {RSP_ZCPN,      700, 700, -1,            -1, -1, {0} },
 321         {RSP_ZCTP,      700, 700, -1,            -1, -1, {0} },
 322         {EV_TIMEOUT,    700, 700, -1,           720, 720, {ACT_ICALL} },
 323         {EV_BC_CLOSED,  720, 720, -1,             0, -1, {ACT_NOTIFY_BC_DOWN} },
 324
 325 /*accept icall*/
 326         {EV_ACCEPT,      -1,  -1, -1,            -1, -1, {ACT_ACCEPT} },
 327         {RSP_INIT,      720, 720, SEQ_ACCEPT,   721,  5, {ACT_CMD + AT_PROTO} },
 328         {RSP_OK,        721, 721, -1,           722,  5, {ACT_CMD + AT_ISO} },
 329         {RSP_OK,        722, 722, -1,           723,  5, {0},   "+VLS=17\r"},
 330         {RSP_OK,        723, 723, -1,           724,  5, {0} },
 331         {RSP_ZVLS,      724, 724, 17,           750, 50, {ACT_ACCEPTED} },
 332         {RSP_ERROR,     721, 729, -1,             0,  0, {ACT_ABORTACCEPT} },
 333         {EV_TIMEOUT,    721, 729, -1,             0,  0, {ACT_ABORTACCEPT} },
 334         {RSP_ZSAU,      700, 729, ZSAU_NULL,      0,  0, {ACT_ABORTACCEPT} },
 335         {RSP_ZSAU,      700, 729, ZSAU_ACTIVE,    0,  0, {ACT_ABORTACCEPT} },
 336         {RSP_ZSAU,      700, 729, ZSAU_DISCONNECT_IND, 0, 0, {ACT_ABORTACCEPT} },
 337
 338         {EV_BC_OPEN,    750, 750, -1,           751, -1},
 339         {EV_TIMEOUT,    750, 751, -1,             0,  0, {ACT_CONNTIMEOUT} },
 340
 341 /* B channel closed (general case) */
 342         {EV_BC_CLOSED,   -1,  -1, -1,            -1, -1, {ACT_NOTIFY_BC_DOWN} },
 343
 344 /* misc. */
 345         {RSP_ZCON,       -1,  -1, -1,            -1, -1, {ACT_DEBUG} },
 346         {RSP_ZCAU,       -1,  -1, -1,            -1, -1, {ACT_ZCAU} },
 347         {RSP_NONE,       -1,  -1, -1,            -1, -1, {ACT_DEBUG} },
 348         {RSP_ANY,        -1,  -1, -1,            -1, -1, {ACT_WARN} },
 349         {RSP_LAST}
 350 };
 351
 352
 353 static const struct resp_type_t {
 354         char    *response;
 355         int     resp_code;
 356         int     type;
 357 }
 358 resp_type[] =
 359 {
 360         {"OK",          RSP_OK,         RT_NOTHING},
 361         {"ERROR",       RSP_ERROR,      RT_NOTHING},
 362         {"ZSAU",        RSP_ZSAU,       RT_ZSAU},
 363         {"ZCAU",        RSP_ZCAU,       RT_ZCAU},
 364         {"RING",        RSP_RING,       RT_RING},
 365         {"ZGCI",        RSP_ZGCI,       RT_NUMBER},
 366         {"ZVLS",        RSP_ZVLS,       RT_NUMBER},
 367         {"ZCTP",        RSP_ZCTP,       RT_NUMBER},
 368         {"ZDLE",        RSP_ZDLE,       RT_NUMBER},
 369         {"ZHLC",        RSP_ZHLC,       RT_STRING},
 370         {"ZBC",         RSP_ZBC,        RT_STRING},
 371         {"NMBR",        RSP_NMBR,       RT_STRING},
 372         {"ZCPN",        RSP_ZCPN,       RT_STRING},
 373         {"ZCON",        RSP_ZCON,       RT_STRING},
 374         {NULL,          0,              0}
 375 };
 376
 377 static const struct zsau_resp_t {
 378         char    *str;
 379         int     code;
 380 }
 381 zsau_resp[] =
 382 {
 383         {"OUTGOING_CALL_PROCEEDING",    ZSAU_PROCEEDING},
 384         {"CALL_DELIVERED",              ZSAU_CALL_DELIVERED},
 385         {"ACTIVE",                      ZSAU_ACTIVE},
 386         {"DISCONNECT_IND",              ZSAU_DISCONNECT_IND},
 387         {"NULL",                        ZSAU_NULL},
 388         {"DISCONNECT_REQ",              ZSAU_DISCONNECT_REQ},
 389         {NULL,                          ZSAU_UNKNOWN}
 390 };
 391
 392 /* check for and remove fixed string prefix
 393  * If s starts with prefix terminated by a non-alphanumeric character,
 394  * return pointer to the first character after that, otherwise return NULL.
 395  */
 396 static char *skip_prefix(char *s, const char *prefix)
 397 {
 398         while (*prefix)
 399                 if (*s++ != *prefix++)
 400                         return NULL;
 401         if (isalnum(*s))
 402                 return NULL;
 403         return s;
 404 }
 405
 406 /* queue event with CID */
 407 static void add_cid_event(struct cardstate *cs, int cid, int type,
 408                           void *ptr, int parameter)
 409 {
 410         unsigned long flags;
 411         unsigned next, tail;
 412         struct event_t *event;
 413
 414         gig_dbg(DEBUG_EVENT, "queueing event %d for cid %d", type, cid);
 415
 416         spin_lock_irqsave(&cs->ev_lock, flags);
 417
 418         tail = cs->ev_tail;
 419         next = (tail + 1) % MAX_EVENTS;
 420         if (unlikely(next == cs->ev_head)) {
 421                 dev_err(cs->dev, "event queue full\n");
 422                 kfree(ptr);
 423         } else {
 424                 event = cs->events + tail;
 425                 event->type = type;
 426                 event->cid = cid;
 427                 event->ptr = ptr;
 428                 event->arg = NULL;
 429                 event->parameter = parameter;
 430                 event->at_state = NULL;
 431                 cs->ev_tail = next;
 432         }
 433
 434         spin_unlock_irqrestore(&cs->ev_lock, flags);
 435 }
 436
 437 /**
 438  * gigaset_handle_modem_response() - process received modem response
 439  * @cs:         device descriptor structure.
 440  *
 441  * Called by asyncdata/isocdata if a block of data received from the
 442  * device must be processed as a modem command response. The data is
 443  * already in the cs structure.
 444  */
 445 void gigaset_handle_modem_response(struct cardstate *cs)
 446 {
 447         char *eoc, *psep, *ptr;
 448         const struct resp_type_t *rt;
 449         const struct zsau_resp_t *zr;
 450         int cid, parameter;
 451         u8 type, value;
 452
 453         if (!cs->cbytes) {
 454                 /* ignore additional LFs/CRs (M10x config mode or cx100) */
 455                 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[0]);
 456                 return;
 457         }
 458         cs->respdata[cs->cbytes] = 0;
 459
 460         if (cs->at_state.getstring) {
 461                 /* state machine wants next line verbatim */
 462                 cs->at_state.getstring = 0;
 463                 ptr = kstrdup(cs->respdata, GFP_ATOMIC);
 464                 gig_dbg(DEBUG_EVENT, "string==%s", ptr ? ptr : "NULL");
 465                 add_cid_event(cs, 0, RSP_STRING, ptr, 0);
 466                 return;
 467         }
 468
 469         /* look up response type */
 470         for (rt = resp_type; rt->response; ++rt) {
 471                 eoc = skip_prefix(cs->respdata, rt->response);
 472                 if (eoc)
 473                         break;
 474         }
 475         if (!rt->response) {
 476                 add_cid_event(cs, 0, RSP_NONE, NULL, 0);
 477                 gig_dbg(DEBUG_EVENT, "unknown modem response: '%s'\n",
 478                         cs->respdata);
 479                 return;
 480         }
 481
 482         /* check for CID */
 483         psep = strrchr(cs->respdata, ';');
 484         if (psep &&
 485             !kstrtoint(psep + 1, 10, &cid) &&
 486             cid >= 1 && cid <= 65535) {
 487                 /* valid CID: chop it off */
 488                 *psep = 0;
 489         } else {
 490                 /* no valid CID: leave unchanged */
 491                 cid = 0;
 492         }
 493
 494         gig_dbg(DEBUG_EVENT, "CMD received: %s", cs->respdata);
 495         if (cid)
 496                 gig_dbg(DEBUG_EVENT, "CID: %d", cid);
 497
 498         switch (rt->type) {
 499         case RT_NOTHING:
 500                 /* check parameter separator */
 501                 if (*eoc)
 502                         goto bad_param; /* extra parameter */
 503
 504                 add_cid_event(cs, cid, rt->resp_code, NULL, 0);
 505                 break;
 506
 507         case RT_RING:
 508                 /* check parameter separator */
 509                 if (!*eoc)
 510                         eoc = NULL;     /* no parameter */
 511                 else if (*eoc++ != ',')
 512                         goto bad_param;
 513
 514                 add_cid_event(cs, 0, rt->resp_code, NULL, cid);
 515
 516                 /* process parameters as individual responses */
 517                 while (eoc) {
 518                         /* look up parameter type */
 519                         psep = NULL;
 520                         for (rt = resp_type; rt->response; ++rt) {
 521                                 psep = skip_prefix(eoc, rt->response);
 522                                 if (psep)
 523                                         break;
 524                         }
 525
 526                         /* all legal parameters are of type RT_STRING */
 527                         if (!psep || rt->type != RT_STRING) {
 528                                 dev_warn(cs->dev,
 529                                          "illegal RING parameter: '%s'\n",
 530                                          eoc);
 531                                 return;
 532                         }
 533
 534                         /* skip parameter value separator */
 535                         if (*psep++ != '=')
 536                                 goto bad_param;
 537
 538                         /* look up end of parameter */
 539                         eoc = strchr(psep, ',');
 540                         if (eoc)
 541                                 *eoc++ = 0;
 542
 543                         /* retrieve parameter value */
 544                         ptr = kstrdup(psep, GFP_ATOMIC);
 545
 546                         /* queue event */
 547                         add_cid_event(cs, cid, rt->resp_code, ptr, 0);
 548                 }
 549                 break;
 550
 551         case RT_ZSAU:
 552                 /* check parameter separator */
 553                 if (!*eoc) {
 554                         /* no parameter */
 555                         add_cid_event(cs, cid, rt->resp_code, NULL, ZSAU_NONE);
 556                         break;
 557                 }
 558                 if (*eoc++ != '=')
 559                         goto bad_param;
 560
 561                 /* look up parameter value */
 562                 for (zr = zsau_resp; zr->str; ++zr)
 563                         if (!strcmp(eoc, zr->str))
 564                                 break;
 565                 if (!zr->str)
 566                         goto bad_param;
 567
 568                 add_cid_event(cs, cid, rt->resp_code, NULL, zr->code);
 569                 break;
 570
 571         case RT_STRING:
 572                 /* check parameter separator */
 573                 if (*eoc++ != '=')
 574                         goto bad_param;
 575
 576                 /* retrieve parameter value */
 577                 ptr = kstrdup(eoc, GFP_ATOMIC);
 578
 579                 /* queue event */
 580                 add_cid_event(cs, cid, rt->resp_code, ptr, 0);
 581                 break;
 582
 583         case RT_ZCAU:
 584                 /* check parameter separators */
 585                 if (*eoc++ != '=')
 586                         goto bad_param;
 587                 psep = strchr(eoc, ',');
 588                 if (!psep)
 589                         goto bad_param;
 590                 *psep++ = 0;
 591
 592                 /* decode parameter values */
 593                 if (kstrtou8(eoc, 16, &type) || kstrtou8(psep, 16, &value)) {
 594                         *--psep = ',';
 595                         goto bad_param;
 596                 }
 597                 parameter = (type << 8) | value;
 598
 599                 add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
 600                 break;
 601
 602         case RT_NUMBER:
 603                 /* check parameter separator */
 604                 if (*eoc++ != '=')
 605                         goto bad_param;
 606
 607                 /* decode parameter value */
 608                 if (kstrtoint(eoc, 10, &parameter))
 609                         goto bad_param;
 610
 611                 /* special case ZDLE: set flag before queueing event */
 612                 if (rt->resp_code == RSP_ZDLE)
 613                         cs->dle = parameter;
 614
 615                 add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
 616                 break;
 617
 618 bad_param:
 619                 /* parameter unexpected, incomplete or malformed */
 620                 dev_warn(cs->dev, "bad parameter in response '%s'\n",
 621                          cs->respdata);
 622                 add_cid_event(cs, cid, rt->resp_code, NULL, -1);
 623                 break;
 624
 625         default:
 626                 dev_err(cs->dev, "%s: internal error on '%s'\n",
 627                         __func__, cs->respdata);
 628         }
 629 }
 630 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
 631
 632 /* disconnect_nobc
 633  * process closing of connection associated with given AT state structure
 634  * without B channel
 635  */
 636 static void disconnect_nobc(struct at_state_t **at_state_p,
 637                             struct cardstate *cs)
 638 {
 639         unsigned long flags;
 640
 641         spin_lock_irqsave(&cs->lock, flags);
 642         ++(*at_state_p)->seq_index;
 643
 644         /* revert to selected idle mode */
 645         if (!cs->cidmode) {
 646                 cs->at_state.pending_commands |= PC_UMMODE;
 647                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 648                 cs->commands_pending = 1;
 649         }
 650
 651         /* check for and deallocate temporary AT state */
 652         if (!list_empty(&(*at_state_p)->list)) {
 653                 list_del(&(*at_state_p)->list);
 654                 kfree(*at_state_p);
 655                 *at_state_p = NULL;
 656         }
 657
 658         spin_unlock_irqrestore(&cs->lock, flags);
 659 }
 660
 661 /* disconnect_bc
 662  * process closing of connection associated with given AT state structure
 663  * and B channel
 664  */
 665 static void disconnect_bc(struct at_state_t *at_state,
 666                           struct cardstate *cs, struct bc_state *bcs)
 667 {
 668         unsigned long flags;
 669
 670         spin_lock_irqsave(&cs->lock, flags);
 671         ++at_state->seq_index;
 672
 673         /* revert to selected idle mode */
 674         if (!cs->cidmode) {
 675                 cs->at_state.pending_commands |= PC_UMMODE;
 676                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 677                 cs->commands_pending = 1;
 678         }
 679         spin_unlock_irqrestore(&cs->lock, flags);
 680
 681         /* invoke hardware specific handler */
 682         cs->ops->close_bchannel(bcs);
 683
 684         /* notify LL */
 685         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 686                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 687                 gigaset_isdn_hupD(bcs);
 688         }
 689 }
 690
 691 /* get_free_channel
 692  * get a free AT state structure: either one of those associated with the
 693  * B channels of the Gigaset device, or if none of those is available,
 694  * a newly allocated one with bcs=NULL
 695  * The structure should be freed by calling disconnect_nobc() after use.
 696  */
 697 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 698                                                   int cid)
 699 /* cids: >0: siemens-cid
 700  *        0: without cid
 701  *       -1: no cid assigned yet
 702  */
 703 {
 704         unsigned long flags;
 705         int i;
 706         struct at_state_t *ret;
 707
 708         for (i = 0; i < cs->channels; ++i)
 709                 if (gigaset_get_channel(cs->bcs + i) >= 0) {
 710                         ret = &cs->bcs[i].at_state;
 711                         ret->cid = cid;
 712                         return ret;
 713                 }
 714
 715         spin_lock_irqsave(&cs->lock, flags);
 716         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 717         if (ret) {
 718                 gigaset_at_init(ret, NULL, cs, cid);
 719                 list_add(&ret->list, &cs->temp_at_states);
 720         }
 721         spin_unlock_irqrestore(&cs->lock, flags);
 722         return ret;
 723 }
 724
 725 static void init_failed(struct cardstate *cs, int mode)
 726 {
 727         int i;
 728         struct at_state_t *at_state;
 729
 730         cs->at_state.pending_commands &= ~PC_INIT;
 731         cs->mode = mode;
 732         cs->mstate = MS_UNINITIALIZED;
 733         gigaset_free_channels(cs);
 734         for (i = 0; i < cs->channels; ++i) {
 735                 at_state = &cs->bcs[i].at_state;
 736                 if (at_state->pending_commands & PC_CID) {
 737                         at_state->pending_commands &= ~PC_CID;
 738                         at_state->pending_commands |= PC_NOCID;
 739                         cs->commands_pending = 1;
 740                 }
 741         }
 742 }
 743
 744 static void schedule_init(struct cardstate *cs, int state)
 745 {
 746         if (cs->at_state.pending_commands & PC_INIT) {
 747                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 748                 return;
 749         }
 750         cs->mstate = state;
 751         cs->mode = M_UNKNOWN;
 752         gigaset_block_channels(cs);
 753         cs->at_state.pending_commands |= PC_INIT;
 754         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 755         cs->commands_pending = 1;
 756 }
 757
 758 /* send an AT command
 759  * adding the "AT" prefix, cid and DLE encapsulation as appropriate
 760  */
 761 static void send_command(struct cardstate *cs, const char *cmd,
 762                          struct at_state_t *at_state)
 763 {
 764         int cid = at_state->cid;
 765         struct cmdbuf_t *cb;
 766         size_t buflen;
 767
 768         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 769         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, GFP_ATOMIC);
 770         if (!cb) {
 771                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 772                 return;
 773         }
 774         if (cid > 0 && cid <= 65535)
 775                 cb->len = snprintf(cb->buf, buflen,
 776                                    cs->dle ? "\020(AT%d%s\020)" : "AT%d%s",
 777                                    cid, cmd);
 778         else
 779                 cb->len = snprintf(cb->buf, buflen,
 780                                    cs->dle ? "\020(AT%s\020)" : "AT%s",
 781                                    cmd);
 782         cb->offset = 0;
 783         cb->next = NULL;
 784         cb->wake_tasklet = NULL;
 785         cs->ops->write_cmd(cs, cb);
 786 }
 787
 788 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 789 {
 790         struct at_state_t *at_state;
 791         int i;
 792         unsigned long flags;
 793
 794         if (cid == 0)
 795                 return &cs->at_state;
 796
 797         for (i = 0; i < cs->channels; ++i)
 798                 if (cid == cs->bcs[i].at_state.cid)
 799                         return &cs->bcs[i].at_state;
 800
 801         spin_lock_irqsave(&cs->lock, flags);
 802
 803         list_for_each_entry(at_state, &cs->temp_at_states, list)
 804                 if (cid == at_state->cid) {
 805                         spin_unlock_irqrestore(&cs->lock, flags);
 806                         return at_state;
 807                 }
 808
 809         spin_unlock_irqrestore(&cs->lock, flags);
 810
 811         return NULL;
 812 }
 813
 814 static void bchannel_down(struct bc_state *bcs)
 815 {
 816         if (bcs->chstate & CHS_B_UP) {
 817                 bcs->chstate &= ~CHS_B_UP;
 818                 gigaset_isdn_hupB(bcs);
 819         }
 820
 821         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 822                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 823                 gigaset_isdn_hupD(bcs);
 824         }
 825
 826         gigaset_free_channel(bcs);
 827
 828         gigaset_bcs_reinit(bcs);
 829 }
 830
 831 static void bchannel_up(struct bc_state *bcs)
 832 {
 833         if (bcs->chstate & CHS_B_UP) {
 834                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 835                            __func__);
 836                 return;
 837         }
 838
 839         bcs->chstate |= CHS_B_UP;
 840         gigaset_isdn_connB(bcs);
 841 }
 842
 843 static void start_dial(struct at_state_t *at_state, void *data,
 844                        unsigned seq_index)
 845 {
 846         struct bc_state *bcs = at_state->bcs;
 847         struct cardstate *cs = at_state->cs;
 848         char **commands = data;
 849         unsigned long flags;
 850         int i;
 851
 852         bcs->chstate |= CHS_NOTIFY_LL;
 853
 854         spin_lock_irqsave(&cs->lock, flags);
 855         if (at_state->seq_index != seq_index) {
 856                 spin_unlock_irqrestore(&cs->lock, flags);
 857                 goto error;
 858         }
 859         spin_unlock_irqrestore(&cs->lock, flags);
 860
 861         for (i = 0; i < AT_NUM; ++i) {
 862                 kfree(bcs->commands[i]);
 863                 bcs->commands[i] = commands[i];
 864         }
 865
 866         at_state->pending_commands |= PC_CID;
 867         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 868         cs->commands_pending = 1;
 869         return;
 870
 871 error:
 872         for (i = 0; i < AT_NUM; ++i) {
 873                 kfree(commands[i]);
 874                 commands[i] = NULL;
 875         }
 876         at_state->pending_commands |= PC_NOCID;
 877         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 878         cs->commands_pending = 1;
 879         return;
 880 }
 881
 882 static void start_accept(struct at_state_t *at_state)
 883 {
 884         struct cardstate *cs = at_state->cs;
 885         struct bc_state *bcs = at_state->bcs;
 886         int i;
 887
 888         for (i = 0; i < AT_NUM; ++i) {
 889                 kfree(bcs->commands[i]);
 890                 bcs->commands[i] = NULL;
 891         }
 892
 893         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 894         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 895         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 896                 dev_err(at_state->cs->dev, "out of memory\n");
 897                 /* error reset */
 898                 at_state->pending_commands |= PC_HUP;
 899                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 900                 cs->commands_pending = 1;
 901                 return;
 902         }
 903
 904         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 905         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 906
 907         at_state->pending_commands |= PC_ACCEPT;
 908         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 909         cs->commands_pending = 1;
 910 }
 911
 912 static void do_start(struct cardstate *cs)
 913 {
 914         gigaset_free_channels(cs);
 915
 916         if (cs->mstate != MS_LOCKED)
 917                 schedule_init(cs, MS_INIT);
 918
 919         cs->isdn_up = 1;
 920         gigaset_isdn_start(cs);
 921
 922         cs->waiting = 0;
 923         wake_up(&cs->waitqueue);
 924 }
 925
 926 static void finish_shutdown(struct cardstate *cs)
 927 {
 928         if (cs->mstate != MS_LOCKED) {
 929                 cs->mstate = MS_UNINITIALIZED;
 930                 cs->mode = M_UNKNOWN;
 931         }
 932
 933         /* Tell the LL that the device is not available .. */
 934         if (cs->isdn_up) {
 935                 cs->isdn_up = 0;
 936                 gigaset_isdn_stop(cs);
 937         }
 938
 939         /* The rest is done by cleanup_cs() in process context. */
 940
 941         cs->cmd_result = -ENODEV;
 942         cs->waiting = 0;
 943         wake_up(&cs->waitqueue);
 944 }
 945
 946 static void do_shutdown(struct cardstate *cs)
 947 {
 948         gigaset_block_channels(cs);
 949
 950         if (cs->mstate == MS_READY) {
 951                 cs->mstate = MS_SHUTDOWN;
 952                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 953                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 954                 cs->commands_pending = 1;
 955         } else
 956                 finish_shutdown(cs);
 957 }
 958
 959 static void do_stop(struct cardstate *cs)
 960 {
 961         unsigned long flags;
 962
 963         spin_lock_irqsave(&cs->lock, flags);
 964         cs->connected = 0;
 965         spin_unlock_irqrestore(&cs->lock, flags);
 966
 967         do_shutdown(cs);
 968 }
 969
 970 /* Entering cid mode or getting a cid failed:
 971  * try to initialize the device and try again.
 972  *
 973  * channel >= 0: getting cid for the channel failed
 974  * channel < 0:  entering cid mode failed
 975  *
 976  * returns 0 on success, <0 on failure
 977  */
 978 static int reinit_and_retry(struct cardstate *cs, int channel)
 979 {
 980         int i;
 981
 982         if (--cs->retry_count <= 0)
 983                 return -EFAULT;
 984
 985         for (i = 0; i < cs->channels; ++i)
 986                 if (cs->bcs[i].at_state.cid > 0)
 987                         return -EBUSY;
 988
 989         if (channel < 0)
 990                 dev_warn(cs->dev,
 991                          "Could not enter cid mode. Reinit device and try again.\n");
 992         else {
 993                 dev_warn(cs->dev,
 994                          "Could not get a call id. Reinit device and try again.\n");
 995                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 996         }
 997         schedule_init(cs, MS_INIT);
 998         return 0;
 999 }
1000
1001 static int at_state_invalid(struct cardstate *cs,
1002                             struct at_state_t *test_ptr)
1003 {
1004         unsigned long flags;
1005         unsigned channel;
1006         struct at_state_t *at_state;
1007         int retval = 0;
1008
1009         spin_lock_irqsave(&cs->lock, flags);
1010
1011         if (test_ptr == &cs->at_state)
1012                 goto exit;
1013
1014         list_for_each_entry(at_state, &cs->temp_at_states, list)
1015                 if (at_state == test_ptr)
1016                         goto exit;
1017
1018         for (channel = 0; channel < cs->channels; ++channel)
1019                 if (&cs->bcs[channel].at_state == test_ptr)
1020                         goto exit;
1021
1022         retval = 1;
1023 exit:
1024         spin_unlock_irqrestore(&cs->lock, flags);
1025         return retval;
1026 }
1027
1028 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
1029                          struct at_state_t *at_state)
1030 {
1031         int retval;
1032
1033         retval = gigaset_isdn_icall(at_state);
1034         switch (retval) {
1035         case ICALL_ACCEPT:
1036                 break;
1037         default:
1038                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
1039                 /* --v-- fall through --v-- */
1040         case ICALL_IGNORE:
1041         case ICALL_REJECT:
1042                 /* hang up actively
1043                  * Device doc says that would reject the call.
1044                  * In fact it doesn't.
1045                  */
1046                 at_state->pending_commands |= PC_HUP;
1047                 cs->commands_pending = 1;
1048                 break;
1049         }
1050 }
1051
1052 static int do_lock(struct cardstate *cs)
1053 {
1054         int mode;
1055         int i;
1056
1057         switch (cs->mstate) {
1058         case MS_UNINITIALIZED:
1059         case MS_READY:
1060                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1061                     cs->at_state.pending_commands)
1062                         return -EBUSY;
1063
1064                 for (i = 0; i < cs->channels; ++i)
1065                         if (cs->bcs[i].at_state.pending_commands)
1066                                 return -EBUSY;
1067
1068                 if (gigaset_get_channels(cs) < 0)
1069                         return -EBUSY;
1070
1071                 break;
1072         case MS_LOCKED:
1073                 break;
1074         default:
1075                 return -EBUSY;
1076         }
1077
1078         mode = cs->mode;
1079         cs->mstate = MS_LOCKED;
1080         cs->mode = M_UNKNOWN;
1081
1082         return mode;
1083 }
1084
1085 static int do_unlock(struct cardstate *cs)
1086 {
1087         if (cs->mstate != MS_LOCKED)
1088                 return -EINVAL;
1089
1090         cs->mstate = MS_UNINITIALIZED;
1091         cs->mode = M_UNKNOWN;
1092         gigaset_free_channels(cs);
1093         if (cs->connected)
1094                 schedule_init(cs, MS_INIT);
1095
1096         return 0;
1097 }
1098
1099 static void do_action(int action, struct cardstate *cs,
1100                       struct bc_state *bcs,
1101                       struct at_state_t **p_at_state, char **pp_command,
1102                       int *p_genresp, int *p_resp_code,
1103                       struct event_t *ev)
1104 {
1105         struct at_state_t *at_state = *p_at_state;
1106         struct bc_state *bcs2;
1107         unsigned long flags;
1108
1109         int channel;
1110
1111         unsigned char *s, *e;
1112         int i;
1113         unsigned long val;
1114
1115         switch (action) {
1116         case ACT_NOTHING:
1117                 break;
1118         case ACT_TIMEOUT:
1119                 at_state->waiting = 1;
1120                 break;
1121         case ACT_INIT:
1122                 cs->at_state.pending_commands &= ~PC_INIT;
1123                 cs->cur_at_seq = SEQ_NONE;
1124                 cs->mode = M_UNIMODEM;
1125                 spin_lock_irqsave(&cs->lock, flags);
1126                 if (!cs->cidmode) {
1127                         spin_unlock_irqrestore(&cs->lock, flags);
1128                         gigaset_free_channels(cs);
1129                         cs->mstate = MS_READY;
1130                         break;
1131                 }
1132                 spin_unlock_irqrestore(&cs->lock, flags);
1133                 cs->at_state.pending_commands |= PC_CIDMODE;
1134                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1135                 cs->commands_pending = 1;
1136                 break;
1137         case ACT_FAILINIT:
1138                 dev_warn(cs->dev, "Could not initialize the device.\n");
1139                 cs->dle = 0;
1140                 init_failed(cs, M_UNKNOWN);
1141                 cs->cur_at_seq = SEQ_NONE;
1142                 break;
1143         case ACT_CONFIGMODE:
1144                 init_failed(cs, M_CONFIG);
1145                 cs->cur_at_seq = SEQ_NONE;
1146                 break;
1147         case ACT_SETDLE1:
1148                 cs->dle = 1;
1149                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1150                 cs->inbuf[0].inputstate &=
1151                         ~(INS_command | INS_DLE_command);
1152                 break;
1153         case ACT_SETDLE0:
1154                 cs->dle = 0;
1155                 cs->inbuf[0].inputstate =
1156                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1157                         | INS_command;
1158                 break;
1159         case ACT_CMODESET:
1160                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1161                         gigaset_free_channels(cs);
1162                         cs->mstate = MS_READY;
1163                 }
1164                 cs->mode = M_CID;
1165                 cs->cur_at_seq = SEQ_NONE;
1166                 break;
1167         case ACT_UMODESET:
1168                 cs->mode = M_UNIMODEM;
1169                 cs->cur_at_seq = SEQ_NONE;
1170                 break;
1171         case ACT_FAILCMODE:
1172                 cs->cur_at_seq = SEQ_NONE;
1173                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1174                         init_failed(cs, M_UNKNOWN);
1175                         break;
1176                 }
1177                 if (reinit_and_retry(cs, -1) < 0)
1178                         schedule_init(cs, MS_RECOVER);
1179                 break;
1180         case ACT_FAILUMODE:
1181                 cs->cur_at_seq = SEQ_NONE;
1182                 schedule_init(cs, MS_RECOVER);
1183                 break;
1184         case ACT_HUPMODEM:
1185                 /* send "+++" (hangup in unimodem mode) */
1186                 if (cs->connected) {
1187                         struct cmdbuf_t *cb;
1188
1189                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1190                         if (!cb) {
1191                                 dev_err(cs->dev, "%s: out of memory\n",
1192                                         __func__);
1193                                 return;
1194                         }
1195                         memcpy(cb->buf, "+++", 3);
1196                         cb->len = 3;
1197                         cb->offset = 0;
1198                         cb->next = NULL;
1199                         cb->wake_tasklet = NULL;
1200                         cs->ops->write_cmd(cs, cb);
1201                 }
1202                 break;
1203         case ACT_RING:
1204                 /* get fresh AT state structure for new CID */
1205                 at_state = get_free_channel(cs, ev->parameter);
1206                 if (!at_state) {
1207                         dev_warn(cs->dev,
1208                                  "RING ignored: could not allocate channel structure\n");
1209                         break;
1210                 }
1211
1212                 /* initialize AT state structure
1213                  * note that bcs may be NULL if no B channel is free
1214                  */
1215                 at_state->ConState = 700;
1216                 for (i = 0; i < STR_NUM; ++i) {
1217                         kfree(at_state->str_var[i]);
1218                         at_state->str_var[i] = NULL;
1219                 }
1220                 at_state->int_var[VAR_ZCTP] = -1;
1221
1222                 spin_lock_irqsave(&cs->lock, flags);
1223                 at_state->timer_expires = RING_TIMEOUT;
1224                 at_state->timer_active = 1;
1225                 spin_unlock_irqrestore(&cs->lock, flags);
1226                 break;
1227         case ACT_ICALL:
1228                 handle_icall(cs, bcs, at_state);
1229                 break;
1230         case ACT_FAILSDOWN:
1231                 dev_warn(cs->dev, "Could not shut down the device.\n");
1232                 /* fall through */
1233         case ACT_FAKESDOWN:
1234         case ACT_SDOWN:
1235                 cs->cur_at_seq = SEQ_NONE;
1236                 finish_shutdown(cs);
1237                 break;
1238         case ACT_CONNECT:
1239                 if (cs->onechannel) {
1240                         at_state->pending_commands |= PC_DLE1;
1241                         cs->commands_pending = 1;
1242                         break;
1243                 }
1244                 bcs->chstate |= CHS_D_UP;
1245                 gigaset_isdn_connD(bcs);
1246                 cs->ops->init_bchannel(bcs);
1247                 break;
1248         case ACT_DLE1:
1249                 cs->cur_at_seq = SEQ_NONE;
1250                 bcs = cs->bcs + cs->curchannel;
1251
1252                 bcs->chstate |= CHS_D_UP;
1253                 gigaset_isdn_connD(bcs);
1254                 cs->ops->init_bchannel(bcs);
1255                 break;
1256         case ACT_FAKEHUP:
1257                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1258                 /* fall through */
1259         case ACT_DISCONNECT:
1260                 cs->cur_at_seq = SEQ_NONE;
1261                 at_state->cid = -1;
1262                 if (!bcs) {
1263                         disconnect_nobc(p_at_state, cs);
1264                 } else if (cs->onechannel && cs->dle) {
1265                         /* Check for other open channels not needed:
1266                          * DLE only used for M10x with one B channel.
1267                          */
1268                         at_state->pending_commands |= PC_DLE0;
1269                         cs->commands_pending = 1;
1270                 } else {
1271                         disconnect_bc(at_state, cs, bcs);
1272                 }
1273                 break;
1274         case ACT_FAKEDLE0:
1275                 at_state->int_var[VAR_ZDLE] = 0;
1276                 cs->dle = 0;
1277                 /* fall through */
1278         case ACT_DLE0:
1279                 cs->cur_at_seq = SEQ_NONE;
1280                 bcs2 = cs->bcs + cs->curchannel;
1281                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1282                 break;
1283         case ACT_ABORTHUP:
1284                 cs->cur_at_seq = SEQ_NONE;
1285                 dev_warn(cs->dev, "Could not hang up.\n");
1286                 at_state->cid = -1;
1287                 if (!bcs)
1288                         disconnect_nobc(p_at_state, cs);
1289                 else if (cs->onechannel)
1290                         at_state->pending_commands |= PC_DLE0;
1291                 else
1292                         disconnect_bc(at_state, cs, bcs);
1293                 schedule_init(cs, MS_RECOVER);
1294                 break;
1295         case ACT_FAILDLE0:
1296                 cs->cur_at_seq = SEQ_NONE;
1297                 dev_warn(cs->dev, "Error leaving DLE mode.\n");
1298                 cs->dle = 0;
1299                 bcs2 = cs->bcs + cs->curchannel;
1300                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1301                 schedule_init(cs, MS_RECOVER);
1302                 break;
1303         case ACT_FAILDLE1:
1304                 cs->cur_at_seq = SEQ_NONE;
1305                 dev_warn(cs->dev,
1306                          "Could not enter DLE mode. Trying to hang up.\n");
1307                 channel = cs->curchannel;
1308                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1309                 cs->commands_pending = 1;
1310                 break;
1311
1312         case ACT_CID: /* got cid; start dialing */
1313                 cs->cur_at_seq = SEQ_NONE;
1314                 channel = cs->curchannel;
1315                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1316                         cs->bcs[channel].at_state.cid = ev->parameter;
1317                         cs->bcs[channel].at_state.pending_commands |=
1318                                 PC_DIAL;
1319                         cs->commands_pending = 1;
1320                         break;
1321                 }
1322                 /* bad cid: fall through */
1323         case ACT_FAILCID:
1324                 cs->cur_at_seq = SEQ_NONE;
1325                 channel = cs->curchannel;
1326                 if (reinit_and_retry(cs, channel) < 0) {
1327                         dev_warn(cs->dev,
1328                                  "Could not get a call ID. Cannot dial.\n");
1329                         bcs2 = cs->bcs + channel;
1330                         disconnect_bc(&bcs2->at_state, cs, bcs2);
1331                 }
1332                 break;
1333         case ACT_ABORTCID:
1334                 cs->cur_at_seq = SEQ_NONE;
1335                 bcs2 = cs->bcs + cs->curchannel;
1336                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1337                 break;
1338
1339         case ACT_DIALING:
1340         case ACT_ACCEPTED:
1341                 cs->cur_at_seq = SEQ_NONE;
1342                 break;
1343
1344         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1345                 if (bcs)
1346                         disconnect_bc(at_state, cs, bcs);
1347                 else
1348                         disconnect_nobc(p_at_state, cs);
1349                 break;
1350
1351         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1352                 cs->cur_at_seq = SEQ_NONE;
1353                 at_state->pending_commands |= PC_HUP;
1354                 cs->commands_pending = 1;
1355                 break;
1356
1357         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1358         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1359         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1360                 at_state->pending_commands |= PC_HUP;
1361                 cs->commands_pending = 1;
1362                 break;
1363         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1364                                are not handled properly anymore */
1365                 at_state->getstring = 1;
1366                 break;
1367         case ACT_SETVER:
1368                 if (!ev->ptr) {
1369                         *p_genresp = 1;
1370                         *p_resp_code = RSP_ERROR;
1371                         break;
1372                 }
1373                 s = ev->ptr;
1374
1375                 if (!strcmp(s, "OK")) {
1376                         /* OK without version string: assume old response */
1377                         *p_genresp = 1;
1378                         *p_resp_code = RSP_NONE;
1379                         break;
1380                 }
1381
1382                 for (i = 0; i < 4; ++i) {
1383                         val = simple_strtoul(s, (char **) &e, 10);
1384                         if (val > INT_MAX || e == s)
1385                                 break;
1386                         if (i == 3) {
1387                                 if (*e)
1388                                         break;
1389                         } else if (*e != '.')
1390                                 break;
1391                         else
1392                                 s = e + 1;
1393                         cs->fwver[i] = val;
1394                 }
1395                 if (i != 4) {
1396                         *p_genresp = 1;
1397                         *p_resp_code = RSP_ERROR;
1398                         break;
1399                 }
1400                 cs->gotfwver = 0;
1401                 break;
1402         case ACT_GOTVER:
1403                 if (cs->gotfwver == 0) {
1404                         cs->gotfwver = 1;
1405                         gig_dbg(DEBUG_EVENT,
1406                                 "firmware version %02d.%03d.%02d.%02d",
1407                                 cs->fwver[0], cs->fwver[1],
1408                                 cs->fwver[2], cs->fwver[3]);
1409                         break;
1410                 }
1411                 /* fall through */
1412         case ACT_FAILVER:
1413                 cs->gotfwver = -1;
1414                 dev_err(cs->dev, "could not read firmware version.\n");
1415                 break;
1416         case ACT_ERROR:
1417                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1418                         __func__, at_state->ConState);
1419                 cs->cur_at_seq = SEQ_NONE;
1420                 break;
1421         case ACT_DEBUG:
1422                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1423                         __func__, ev->type, at_state->ConState);
1424                 break;
1425         case ACT_WARN:
1426                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1427                          __func__, ev->type, at_state->ConState);
1428                 break;
1429         case ACT_ZCAU:
1430                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1431                          ev->parameter, at_state->ConState);
1432                 break;
1433
1434         /* events from the LL */
1435
1436         case ACT_DIAL:
1437                 if (!ev->ptr) {
1438                         *p_genresp = 1;
1439                         *p_resp_code = RSP_ERROR;
1440                         break;
1441                 }
1442                 start_dial(at_state, ev->ptr, ev->parameter);
1443                 break;
1444         case ACT_ACCEPT:
1445                 start_accept(at_state);
1446                 break;
1447         case ACT_HUP:
1448                 at_state->pending_commands |= PC_HUP;
1449                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1450                 cs->commands_pending = 1;
1451                 break;
1452
1453         /* hotplug events */
1454
1455         case ACT_STOP:
1456                 do_stop(cs);
1457                 break;
1458         case ACT_START:
1459                 do_start(cs);
1460                 break;
1461
1462         /* events from the interface */
1463
1464         case ACT_IF_LOCK:
1465                 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1466                 cs->waiting = 0;
1467                 wake_up(&cs->waitqueue);
1468                 break;
1469         case ACT_IF_VER:
1470                 if (ev->parameter != 0)
1471                         cs->cmd_result = -EINVAL;
1472                 else if (cs->gotfwver != 1) {
1473                         cs->cmd_result = -ENOENT;
1474                 } else {
1475                         memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1476                         cs->cmd_result = 0;
1477                 }
1478                 cs->waiting = 0;
1479                 wake_up(&cs->waitqueue);
1480                 break;
1481
1482         /* events from the proc file system */
1483
1484         case ACT_PROC_CIDMODE:
1485                 spin_lock_irqsave(&cs->lock, flags);
1486                 if (ev->parameter != cs->cidmode) {
1487                         cs->cidmode = ev->parameter;
1488                         if (ev->parameter) {
1489                                 cs->at_state.pending_commands |= PC_CIDMODE;
1490                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1491                         } else {
1492                                 cs->at_state.pending_commands |= PC_UMMODE;
1493                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1494                         }
1495                         cs->commands_pending = 1;
1496                 }
1497                 spin_unlock_irqrestore(&cs->lock, flags);
1498                 cs->waiting = 0;
1499                 wake_up(&cs->waitqueue);
1500                 break;
1501
1502         /* events from the hardware drivers */
1503
1504         case ACT_NOTIFY_BC_DOWN:
1505                 bchannel_down(bcs);
1506                 break;
1507         case ACT_NOTIFY_BC_UP:
1508                 bchannel_up(bcs);
1509                 break;
1510         case ACT_SHUTDOWN:
1511                 do_shutdown(cs);
1512                 break;
1513
1514
1515         default:
1516                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1517                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1518                         if (!*pp_command) {
1519                                 *p_genresp = 1;
1520                                 *p_resp_code = RSP_NULL;
1521                         }
1522                 } else
1523                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1524         }
1525 }
1526
1527 /* State machine to do the calling and hangup procedure */
1528 static void process_event(struct cardstate *cs, struct event_t *ev)
1529 {
1530         struct bc_state *bcs;
1531         char *p_command = NULL;
1532         struct reply_t *rep;
1533         int rcode;
1534         int genresp = 0;
1535         int resp_code = RSP_ERROR;
1536         struct at_state_t *at_state;
1537         int index;
1538         int curact;
1539         unsigned long flags;
1540
1541         if (ev->cid >= 0) {
1542                 at_state = at_state_from_cid(cs, ev->cid);
1543                 if (!at_state) {
1544                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1545                                 ev->type, ev->cid);
1546                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1547                                           NULL, 0, NULL);
1548                         return;
1549                 }
1550         } else {
1551                 at_state = ev->at_state;
1552                 if (at_state_invalid(cs, at_state)) {
1553                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1554                                 at_state);
1555                         return;
1556                 }
1557         }
1558
1559         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1560                 at_state->ConState, ev->type);
1561
1562         bcs = at_state->bcs;
1563
1564         /* Setting the pointer to the dial array */
1565         rep = at_state->replystruct;
1566
1567         spin_lock_irqsave(&cs->lock, flags);
1568         if (ev->type == EV_TIMEOUT) {
1569                 if (ev->parameter != at_state->timer_index
1570                     || !at_state->timer_active) {
1571                         ev->type = RSP_NONE; /* old timeout */
1572                         gig_dbg(DEBUG_EVENT, "old timeout");
1573                 } else {
1574                         if (at_state->waiting)
1575                                 gig_dbg(DEBUG_EVENT, "stopped waiting");
1576                         else
1577                                 gig_dbg(DEBUG_EVENT, "timeout occurred");
1578                 }
1579         }
1580         spin_unlock_irqrestore(&cs->lock, flags);
1581
1582         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1583            or at_state->str_var[STR_XXXX], set it */
1584         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1585                 index = ev->type - RSP_VAR;
1586                 at_state->int_var[index] = ev->parameter;
1587         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1588                 index = ev->type - RSP_STR;
1589                 kfree(at_state->str_var[index]);
1590                 at_state->str_var[index] = ev->ptr;
1591                 ev->ptr = NULL; /* prevent process_events() from
1592                                    deallocating ptr */
1593         }
1594
1595         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1596                 at_state->getstring = 0;
1597
1598         /* Search row in dial array which matches modem response and current
1599            constate */
1600         for (;; rep++) {
1601                 rcode = rep->resp_code;
1602                 if (rcode == RSP_LAST) {
1603                         /* found nothing...*/
1604                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1605                                  "resp_code %d in ConState %d!\n",
1606                                  __func__, ev->type, at_state->ConState);
1607                         return;
1608                 }
1609                 if ((rcode == RSP_ANY || rcode == ev->type)
1610                     && ((int) at_state->ConState >= rep->min_ConState)
1611                     && (rep->max_ConState < 0
1612                         || (int) at_state->ConState <= rep->max_ConState)
1613                     && (rep->parameter < 0 || rep->parameter == ev->parameter))
1614                         break;
1615         }
1616
1617         p_command = rep->command;
1618
1619         at_state->waiting = 0;
1620         for (curact = 0; curact < MAXACT; ++curact) {
1621                 /* The row tells us what we should do  ..
1622                  */
1623                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1624                           &genresp, &resp_code, ev);
1625                 if (!at_state)
1626                         /* at_state destroyed by disconnect */
1627                         return;
1628         }
1629
1630         /* Jump to the next con-state regarding the array */
1631         if (rep->new_ConState >= 0)
1632                 at_state->ConState = rep->new_ConState;
1633
1634         if (genresp) {
1635                 spin_lock_irqsave(&cs->lock, flags);
1636                 at_state->timer_expires = 0;
1637                 at_state->timer_active = 0;
1638                 spin_unlock_irqrestore(&cs->lock, flags);
1639                 gigaset_add_event(cs, at_state, resp_code, NULL, 0, NULL);
1640         } else {
1641                 /* Send command to modem if not NULL... */
1642                 if (p_command) {
1643                         if (cs->connected)
1644                                 send_command(cs, p_command, at_state);
1645                         else
1646                                 gigaset_add_event(cs, at_state, RSP_NODEV,
1647                                                   NULL, 0, NULL);
1648                 }
1649
1650                 spin_lock_irqsave(&cs->lock, flags);
1651                 if (!rep->timeout) {
1652                         at_state->timer_expires = 0;
1653                         at_state->timer_active = 0;
1654                 } else if (rep->timeout > 0) { /* new timeout */
1655                         at_state->timer_expires = rep->timeout * 10;
1656                         at_state->timer_active = 1;
1657                         ++at_state->timer_index;
1658                 }
1659                 spin_unlock_irqrestore(&cs->lock, flags);
1660         }
1661 }
1662
1663 static void schedule_sequence(struct cardstate *cs,
1664                               struct at_state_t *at_state, int sequence)
1665 {
1666         cs->cur_at_seq = sequence;
1667         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1668 }
1669
1670 static void process_command_flags(struct cardstate *cs)
1671 {
1672         struct at_state_t *at_state = NULL;
1673         struct bc_state *bcs;
1674         int i;
1675         int sequence;
1676         unsigned long flags;
1677
1678         cs->commands_pending = 0;
1679
1680         if (cs->cur_at_seq) {
1681                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1682                 return;
1683         }
1684
1685         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1686
1687         sequence = SEQ_NONE;
1688
1689         /* clear pending_commands and hangup channels on shutdown */
1690         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1691                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1692                 for (i = 0; i < cs->channels; ++i) {
1693                         bcs = cs->bcs + i;
1694                         at_state = &bcs->at_state;
1695                         at_state->pending_commands &=
1696                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1697                         if (at_state->cid > 0)
1698                                 at_state->pending_commands |= PC_HUP;
1699                         if (at_state->pending_commands & PC_CID) {
1700                                 at_state->pending_commands |= PC_NOCID;
1701                                 at_state->pending_commands &= ~PC_CID;
1702                         }
1703                 }
1704         }
1705
1706         /* clear pending_commands and hangup channels on reset */
1707         if (cs->at_state.pending_commands & PC_INIT) {
1708                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1709                 for (i = 0; i < cs->channels; ++i) {
1710                         bcs = cs->bcs + i;
1711                         at_state = &bcs->at_state;
1712                         at_state->pending_commands &=
1713                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1714                         if (at_state->cid > 0)
1715                                 at_state->pending_commands |= PC_HUP;
1716                         if (cs->mstate == MS_RECOVER) {
1717                                 if (at_state->pending_commands & PC_CID) {
1718                                         at_state->pending_commands |= PC_NOCID;
1719                                         at_state->pending_commands &= ~PC_CID;
1720                                 }
1721                         }
1722                 }
1723         }
1724
1725         /* only switch back to unimodem mode if no commands are pending and
1726          * no channels are up */
1727         spin_lock_irqsave(&cs->lock, flags);
1728         if (cs->at_state.pending_commands == PC_UMMODE
1729             && !cs->cidmode
1730             && list_empty(&cs->temp_at_states)
1731             && cs->mode == M_CID) {
1732                 sequence = SEQ_UMMODE;
1733                 at_state = &cs->at_state;
1734                 for (i = 0; i < cs->channels; ++i) {
1735                         bcs = cs->bcs + i;
1736                         if (bcs->at_state.pending_commands ||
1737                             bcs->at_state.cid > 0) {
1738                                 sequence = SEQ_NONE;
1739                                 break;
1740                         }
1741                 }
1742         }
1743         spin_unlock_irqrestore(&cs->lock, flags);
1744         cs->at_state.pending_commands &= ~PC_UMMODE;
1745         if (sequence != SEQ_NONE) {
1746                 schedule_sequence(cs, at_state, sequence);
1747                 return;
1748         }
1749
1750         for (i = 0; i < cs->channels; ++i) {
1751                 bcs = cs->bcs + i;
1752                 if (bcs->at_state.pending_commands & PC_HUP) {
1753                         if (cs->dle) {
1754                                 cs->curchannel = bcs->channel;
1755                                 schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1756                                 return;
1757                         }
1758                         bcs->at_state.pending_commands &= ~PC_HUP;
1759                         if (bcs->at_state.pending_commands & PC_CID) {
1760                                 /* not yet dialing: PC_NOCID is sufficient */
1761                                 bcs->at_state.pending_commands |= PC_NOCID;
1762                                 bcs->at_state.pending_commands &= ~PC_CID;
1763                         } else {
1764                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1765                                 return;
1766                         }
1767                 }
1768                 if (bcs->at_state.pending_commands & PC_NOCID) {
1769                         bcs->at_state.pending_commands &= ~PC_NOCID;
1770                         cs->curchannel = bcs->channel;
1771                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1772                         return;
1773                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1774                         bcs->at_state.pending_commands &= ~PC_DLE0;
1775                         cs->curchannel = bcs->channel;
1776                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1777                         return;
1778                 }
1779         }
1780
1781         list_for_each_entry(at_state, &cs->temp_at_states, list)
1782                 if (at_state->pending_commands & PC_HUP) {
1783                         at_state->pending_commands &= ~PC_HUP;
1784                         schedule_sequence(cs, at_state, SEQ_HUP);
1785                         return;
1786                 }
1787
1788         if (cs->at_state.pending_commands & PC_INIT) {
1789                 cs->at_state.pending_commands &= ~PC_INIT;
1790                 cs->dle = 0;
1791                 cs->inbuf->inputstate = INS_command;
1792                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1793                 return;
1794         }
1795         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1796                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1797                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1798                 return;
1799         }
1800         if (cs->at_state.pending_commands & PC_CIDMODE) {
1801                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1802                 if (cs->mode == M_UNIMODEM) {
1803                         cs->retry_count = 1;
1804                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1805                         return;
1806                 }
1807         }
1808
1809         for (i = 0; i < cs->channels; ++i) {
1810                 bcs = cs->bcs + i;
1811                 if (bcs->at_state.pending_commands & PC_DLE1) {
1812                         bcs->at_state.pending_commands &= ~PC_DLE1;
1813                         cs->curchannel = bcs->channel;
1814                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1815                         return;
1816                 }
1817                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1818                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1819                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1820                         return;
1821                 }
1822                 if (bcs->at_state.pending_commands & PC_DIAL) {
1823                         bcs->at_state.pending_commands &= ~PC_DIAL;
1824                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1825                         return;
1826                 }
1827                 if (bcs->at_state.pending_commands & PC_CID) {
1828                         switch (cs->mode) {
1829                         case M_UNIMODEM:
1830                                 cs->at_state.pending_commands |= PC_CIDMODE;
1831                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1832                                 cs->commands_pending = 1;
1833                                 return;
1834                         case M_UNKNOWN:
1835                                 schedule_init(cs, MS_INIT);
1836                                 return;
1837                         }
1838                         bcs->at_state.pending_commands &= ~PC_CID;
1839                         cs->curchannel = bcs->channel;
1840                         cs->retry_count = 2;
1841                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1842                         return;
1843                 }
1844         }
1845 }
1846
1847 static void process_events(struct cardstate *cs)
1848 {
1849         struct event_t *ev;
1850         unsigned head, tail;
1851         int i;
1852         int check_flags = 0;
1853         int was_busy;
1854         unsigned long flags;
1855
1856         spin_lock_irqsave(&cs->ev_lock, flags);
1857         head = cs->ev_head;
1858
1859         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1860                 tail = cs->ev_tail;
1861                 if (tail == head) {
1862                         if (!check_flags && !cs->commands_pending)
1863                                 break;
1864                         check_flags = 0;
1865                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1866                         process_command_flags(cs);
1867                         spin_lock_irqsave(&cs->ev_lock, flags);
1868                         tail = cs->ev_tail;
1869                         if (tail == head) {
1870                                 if (!cs->commands_pending)
1871                                         break;
1872                                 continue;
1873                         }
1874                 }
1875
1876                 ev = cs->events + head;
1877                 was_busy = cs->cur_at_seq != SEQ_NONE;
1878                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1879                 process_event(cs, ev);
1880                 spin_lock_irqsave(&cs->ev_lock, flags);
1881                 kfree(ev->ptr);
1882                 ev->ptr = NULL;
1883                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1884                         check_flags = 1;
1885
1886                 head = (head + 1) % MAX_EVENTS;
1887                 cs->ev_head = head;
1888         }
1889
1890         spin_unlock_irqrestore(&cs->ev_lock, flags);
1891
1892         if (i == 2 * MAX_EVENTS) {
1893                 dev_err(cs->dev,
1894                         "infinite loop in process_events; aborting.\n");
1895         }
1896 }
1897
1898 /* tasklet scheduled on any event received from the Gigaset device
1899  * parameter:
1900  *      data    ISDN controller state structure
1901  */
1902 void gigaset_handle_event(unsigned long data)
1903 {
1904         struct cardstate *cs = (struct cardstate *) data;
1905
1906         /* handle incoming data on control/common channel */
1907         if (cs->inbuf->head != cs->inbuf->tail) {
1908                 gig_dbg(DEBUG_INTR, "processing new data");
1909                 cs->ops->handle_input(cs->inbuf);
1910         }
1911
1912         process_events(cs);
1913 }