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
 194 /* leave dle mode */
 195         {RSP_INIT,        0,   0, SEQ_DLE0,             201,  5, {0},   "^SDLE=0\r"},
 196         {RSP_OK,        201, 201, -1,                   202, -1},
 197         {RSP_ZDLE,      202, 202,  0,                     0,  0, {ACT_DLE0} },
 198         {RSP_NODEV,     200, 249, -1,                     0,  0, {ACT_FAKEDLE0} },
 199         {RSP_ERROR,     200, 249, -1,                     0,  0, {ACT_FAILDLE0} },
 200         {EV_TIMEOUT,    200, 249, -1,                     0,  0, {ACT_FAILDLE0} },
 201
 202 /* enter dle mode */
 203         {RSP_INIT,        0,   0, SEQ_DLE1,             251,  5, {0},   "^SDLE=1\r"},
 204         {RSP_OK,        251, 251, -1,                   252, -1},
 205         {RSP_ZDLE,      252, 252,  1,                     0,  0, {ACT_DLE1} },
 206         {RSP_ERROR,     250, 299, -1,                     0,  0, {ACT_FAILDLE1} },
 207         {EV_TIMEOUT,    250, 299, -1,                     0,  0, {ACT_FAILDLE1} },
 208
 209 /* incoming call */
 210         {RSP_RING,       -1,  -1, -1,                    -1, -1, {ACT_RING} },
 211
 212 /* get cid */
 213         {RSP_INIT,        0,   0, SEQ_CID,              301,  5, {0},   "^SGCI?\r"},
 214         {RSP_OK,        301, 301, -1,                   302, -1},
 215         {RSP_ZGCI,      302, 302, -1,                     0,  0, {ACT_CID} },
 216         {RSP_ERROR,     301, 349, -1,                     0,  0, {ACT_FAILCID} },
 217         {EV_TIMEOUT,    301, 349, -1,                     0,  0, {ACT_FAILCID} },
 218
 219 /* enter cid mode */
 220         {RSP_INIT,        0,   0, SEQ_CIDMODE,          150,  5, {0},   "^SGCI=1\r"},
 221         {RSP_OK,        150, 150, -1,                     0,  0, {ACT_CMODESET} },
 222         {RSP_ERROR,     150, 150, -1,                     0,  0, {ACT_FAILCMODE} },
 223         {EV_TIMEOUT,    150, 150, -1,                     0,  0, {ACT_FAILCMODE} },
 224
 225 /* leave cid mode */
 226         {RSP_INIT,        0,   0, SEQ_UMMODE,           160,  5, {0},   "Z\r"},
 227         {RSP_OK,        160, 160, -1,                     0,  0, {ACT_UMODESET} },
 228         {RSP_ERROR,     160, 160, -1,                     0,  0, {ACT_FAILUMODE} },
 229         {EV_TIMEOUT,    160, 160, -1,                     0,  0, {ACT_FAILUMODE} },
 230
 231 /* abort getting cid */
 232         {RSP_INIT,        0,   0, SEQ_NOCID,              0,  0, {ACT_ABORTCID} },
 233
 234 /* reset */
 235         {RSP_INIT,        0,   0, SEQ_SHUTDOWN,         504,  5, {0},   "Z\r"},
 236         {RSP_OK,        504, 504, -1,                     0,  0, {ACT_SDOWN} },
 237         {RSP_ERROR,     501, 599, -1,                     0,  0, {ACT_FAILSDOWN} },
 238         {EV_TIMEOUT,    501, 599, -1,                     0,  0, {ACT_FAILSDOWN} },
 239         {RSP_NODEV,     501, 599, -1,                     0,  0, {ACT_FAKESDOWN} },
 240
 241         {EV_PROC_CIDMODE, -1, -1, -1,                    -1, -1, {ACT_PROC_CIDMODE} },
 242         {EV_IF_LOCK,     -1,  -1, -1,                    -1, -1, {ACT_IF_LOCK} },
 243         {EV_IF_VER,      -1,  -1, -1,                    -1, -1, {ACT_IF_VER} },
 244         {EV_START,       -1,  -1, -1,                    -1, -1, {ACT_START} },
 245         {EV_STOP,        -1,  -1, -1,                    -1, -1, {ACT_STOP} },
 246         {EV_SHUTDOWN,    -1,  -1, -1,                    -1, -1, {ACT_SHUTDOWN} },
 247
 248 /* misc. */
 249         {RSP_ERROR,      -1,  -1, -1,                    -1, -1, {ACT_ERROR} },
 250         {RSP_ZCAU,       -1,  -1, -1,                    -1, -1, {ACT_ZCAU} },
 251         {RSP_NONE,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 252         {RSP_ANY,        -1,  -1, -1,                    -1, -1, {ACT_WARN} },
 253         {RSP_LAST}
 254 };
 255
 256 /* 600: start dialing, 650: dial in progress, 800: connection is up, 700: ring,
 257  * 400: hup, 750: accepted icall */
 258 struct reply_t gigaset_tab_cid[] =
 259 {
 260 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
 261  * action, command */
 262
 263 /* dial */
 264         {EV_DIAL,        -1,  -1, -1,                    -1, -1, {ACT_DIAL} },
 265         {RSP_INIT,        0,   0, SEQ_DIAL,             601,  5, {ACT_CMD + AT_BC} },
 266         {RSP_OK,        601, 601, -1,                   603,  5, {ACT_CMD + AT_PROTO} },
 267         {RSP_OK,        603, 603, -1,                   604,  5, {ACT_CMD + AT_TYPE} },
 268         {RSP_OK,        604, 604, -1,                   605,  5, {ACT_CMD + AT_MSN} },
 269         {RSP_NULL,      605, 605, -1,                   606,  5, {ACT_CMD + AT_CLIP} },
 270         {RSP_OK,        605, 605, -1,                   606,  5, {ACT_CMD + AT_CLIP} },
 271         {RSP_NULL,      606, 606, -1,                   607,  5, {ACT_CMD + AT_ISO} },
 272         {RSP_OK,        606, 606, -1,                   607,  5, {ACT_CMD + AT_ISO} },
 273         {RSP_OK,        607, 607, -1,                   608,  5, {0},   "+VLS=17\r"},
 274         {RSP_OK,        608, 608, -1,                   609, -1},
 275         {RSP_ZSAU,      609, 609, ZSAU_PROCEEDING,      610,  5, {ACT_CMD + AT_DIAL} },
 276         {RSP_OK,        610, 610, -1,                   650,  0, {ACT_DIALING} },
 277
 278         {RSP_ERROR,     601, 610, -1,                     0,  0, {ACT_ABORTDIAL} },
 279         {EV_TIMEOUT,    601, 610, -1,                     0,  0, {ACT_ABORTDIAL} },
 280
 281 /* optional dialing responses */
 282         {EV_BC_OPEN,    650, 650, -1,                   651, -1},
 283         {RSP_ZVLS,      609, 651, 17,                    -1, -1, {ACT_DEBUG} },
 284         {RSP_ZCTP,      610, 651, -1,                    -1, -1, {ACT_DEBUG} },
 285         {RSP_ZCPN,      610, 651, -1,                    -1, -1, {ACT_DEBUG} },
 286         {RSP_ZSAU,      650, 651, ZSAU_CALL_DELIVERED,   -1, -1, {ACT_DEBUG} },
 287
 288 /* connect */
 289         {RSP_ZSAU,      650, 650, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT} },
 290         {RSP_ZSAU,      651, 651, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT,
 291                                                                   ACT_NOTIFY_BC_UP} },
 292         {RSP_ZSAU,      750, 750, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT} },
 293         {RSP_ZSAU,      751, 751, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT,
 294                                                                   ACT_NOTIFY_BC_UP} },
 295         {EV_BC_OPEN,    800, 800, -1,                   800, -1, {ACT_NOTIFY_BC_UP} },
 296
 297 /* remote hangup */
 298         {RSP_ZSAU,      650, 651, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEREJECT} },
 299         {RSP_ZSAU,      750, 751, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEHUP} },
 300         {RSP_ZSAU,      800, 800, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEHUP} },
 301
 302 /* hangup */
 303         {EV_HUP,         -1,  -1, -1,                    -1, -1, {ACT_HUP} },
 304         {RSP_INIT,       -1,  -1, SEQ_HUP,              401,  5, {0},   "+VLS=0\r"},
 305         {RSP_OK,        401, 401, -1,                   402,  5},
 306         {RSP_ZVLS,      402, 402,  0,                   403,  5},
 307         {RSP_ZSAU,      403, 403, ZSAU_DISCONNECT_REQ,   -1, -1, {ACT_DEBUG} },
 308         {RSP_ZSAU,      403, 403, ZSAU_NULL,              0,  0, {ACT_DISCONNECT} },
 309         {RSP_NODEV,     401, 403, -1,                     0,  0, {ACT_FAKEHUP} },
 310         {RSP_ERROR,     401, 401, -1,                     0,  0, {ACT_ABORTHUP} },
 311         {EV_TIMEOUT,    401, 403, -1,                     0,  0, {ACT_ABORTHUP} },
 312
 313         {EV_BC_CLOSED,    0,   0, -1,                     0, -1, {ACT_NOTIFY_BC_DOWN} },
 314
 315 /* ring */
 316         {RSP_ZBC,       700, 700, -1,                    -1, -1, {0} },
 317         {RSP_ZHLC,      700, 700, -1,                    -1, -1, {0} },
 318         {RSP_NMBR,      700, 700, -1,                    -1, -1, {0} },
 319         {RSP_ZCPN,      700, 700, -1,                    -1, -1, {0} },
 320         {RSP_ZCTP,      700, 700, -1,                    -1, -1, {0} },
 321         {EV_TIMEOUT,    700, 700, -1,                   720, 720, {ACT_ICALL} },
 322         {EV_BC_CLOSED,  720, 720, -1,                     0, -1, {ACT_NOTIFY_BC_DOWN} },
 323
 324 /*accept icall*/
 325         {EV_ACCEPT,      -1,  -1, -1,                    -1, -1, {ACT_ACCEPT} },
 326         {RSP_INIT,      720, 720, SEQ_ACCEPT,           721,  5, {ACT_CMD + AT_PROTO} },
 327         {RSP_OK,        721, 721, -1,                   722,  5, {ACT_CMD + AT_ISO} },
 328         {RSP_OK,        722, 722, -1,                   723,  5, {0},   "+VLS=17\r"},
 329         {RSP_OK,        723, 723, -1,                   724,  5, {0} },
 330         {RSP_ZVLS,      724, 724, 17,                   750, 50, {ACT_ACCEPTED} },
 331         {RSP_ERROR,     721, 729, -1,                     0,  0, {ACT_ABORTACCEPT} },
 332         {EV_TIMEOUT,    721, 729, -1,                     0,  0, {ACT_ABORTACCEPT} },
 333         {RSP_ZSAU,      700, 729, ZSAU_NULL,              0,  0, {ACT_ABORTACCEPT} },
 334         {RSP_ZSAU,      700, 729, ZSAU_ACTIVE,            0,  0, {ACT_ABORTACCEPT} },
 335         {RSP_ZSAU,      700, 729, ZSAU_DISCONNECT_IND,    0,  0, {ACT_ABORTACCEPT} },
 336
 337         {EV_BC_OPEN,    750, 750, -1,                   751, -1},
 338         {EV_TIMEOUT,    750, 751, -1,                     0,  0, {ACT_CONNTIMEOUT} },
 339
 340 /* B channel closed (general case) */
 341         {EV_BC_CLOSED,   -1,  -1, -1,                    -1, -1, {ACT_NOTIFY_BC_DOWN} },
 342
 343 /* misc. */
 344         {RSP_ZCON,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 345         {RSP_ZCAU,       -1,  -1, -1,                    -1, -1, {ACT_ZCAU} },
 346         {RSP_NONE,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 347         {RSP_ANY,        -1,  -1, -1,                    -1, -1, {ACT_WARN} },
 348         {RSP_LAST}
 349 };
 350
 351
 352 static const struct resp_type_t {
 353         unsigned char   *response;
 354         int             resp_code;
 355         int             type;
 356 } resp_type[] =
 357 {
 358         {"OK",          RSP_OK,         RT_NOTHING},
 359         {"ERROR",       RSP_ERROR,      RT_NOTHING},
 360         {"ZSAU",        RSP_ZSAU,       RT_ZSAU},
 361         {"ZCAU",        RSP_ZCAU,       RT_ZCAU},
 362         {"RING",        RSP_RING,       RT_RING},
 363         {"ZGCI",        RSP_ZGCI,       RT_NUMBER},
 364         {"ZVLS",        RSP_ZVLS,       RT_NUMBER},
 365         {"ZCTP",        RSP_ZCTP,       RT_NUMBER},
 366         {"ZDLE",        RSP_ZDLE,       RT_NUMBER},
 367         {"ZHLC",        RSP_ZHLC,       RT_STRING},
 368         {"ZBC",         RSP_ZBC,        RT_STRING},
 369         {"NMBR",        RSP_NMBR,       RT_STRING},
 370         {"ZCPN",        RSP_ZCPN,       RT_STRING},
 371         {"ZCON",        RSP_ZCON,       RT_STRING},
 372         {NULL,          0,              0}
 373 };
 374
 375 static const struct zsau_resp_t {
 376         unsigned char   *str;
 377         int             code;
 378 } zsau_resp[] =
 379 {
 380         {"OUTGOING_CALL_PROCEEDING",    ZSAU_OUTGOING_CALL_PROCEEDING},
 381         {"CALL_DELIVERED",              ZSAU_CALL_DELIVERED},
 382         {"ACTIVE",                      ZSAU_ACTIVE},
 383         {"DISCONNECT_IND",              ZSAU_DISCONNECT_IND},
 384         {"NULL",                        ZSAU_NULL},
 385         {"DISCONNECT_REQ",              ZSAU_DISCONNECT_REQ},
 386         {NULL,                          ZSAU_UNKNOWN}
 387 };
 388
 389 /* retrieve CID from parsed response
 390  * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
 391  */
 392 static int cid_of_response(char *s)
 393 {
 394         int cid;
 395         int rc;
 396
 397         if (s[-1] != ';')
 398                 return 0;       /* no CID separator */
 399         rc = kstrtoint(s, 10, &cid);
 400         if (rc)
 401                 return 0;       /* CID not numeric */
 402         if (cid < 1 || cid > 65535)
 403                 return -1;      /* CID out of range */
 404         return cid;
 405 }
 406
 407 /**
 408  * gigaset_handle_modem_response() - process received modem response
 409  * @cs:         device descriptor structure.
 410  *
 411  * Called by asyncdata/isocdata if a block of data received from the
 412  * device must be processed as a modem command response. The data is
 413  * already in the cs structure.
 414  */
 415 void gigaset_handle_modem_response(struct cardstate *cs)
 416 {
 417         unsigned char *argv[MAX_REC_PARAMS + 1];
 418         int params;
 419         int i, j;
 420         const struct resp_type_t *rt;
 421         const struct zsau_resp_t *zr;
 422         int curarg;
 423         unsigned long flags;
 424         unsigned next, tail, head;
 425         struct event_t *event;
 426         int resp_code;
 427         int param_type;
 428         int abort;
 429         size_t len;
 430         int cid;
 431         int rawstring;
 432
 433         len = cs->cbytes;
 434         if (!len) {
 435                 /* ignore additional LFs/CRs (M10x config mode or cx100) */
 436                 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[len]);
 437                 return;
 438         }
 439         cs->respdata[len] = 0;
 440         argv[0] = cs->respdata;
 441         params = 1;
 442         if (cs->at_state.getstring) {
 443                 /* getstring only allowed without cid at the moment */
 444                 cs->at_state.getstring = 0;
 445                 rawstring = 1;
 446                 cid = 0;
 447         } else {
 448                 /* parse line */
 449                 for (i = 0; i < len; i++)
 450                         switch (cs->respdata[i]) {
 451                         case ';':
 452                         case ',':
 453                         case '=':
 454                                 if (params > MAX_REC_PARAMS) {
 455                                         dev_warn(cs->dev,
 456                                                  "too many parameters in response\n");
 457                                         /* need last parameter (might be CID) */
 458                                         params--;
 459                                 }
 460                                 argv[params++] = cs->respdata + i + 1;
 461                         }
 462
 463                 rawstring = 0;
 464                 cid = params > 1 ? cid_of_response(argv[params - 1]) : 0;
 465                 if (cid < 0) {
 466                         gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
 467                                           NULL, 0, NULL);
 468                         return;
 469                 }
 470
 471                 for (j = 1; j < params; ++j)
 472                         argv[j][-1] = 0;
 473
 474                 gig_dbg(DEBUG_EVENT, "CMD received: %s", argv[0]);
 475                 if (cid) {
 476                         --params;
 477                         gig_dbg(DEBUG_EVENT, "CID: %s", argv[params]);
 478                 }
 479                 gig_dbg(DEBUG_EVENT, "available params: %d", params - 1);
 480                 for (j = 1; j < params; j++)
 481                         gig_dbg(DEBUG_EVENT, "param %d: %s", j, argv[j]);
 482         }
 483
 484         spin_lock_irqsave(&cs->ev_lock, flags);
 485         head = cs->ev_head;
 486         tail = cs->ev_tail;
 487
 488         abort = 1;
 489         curarg = 0;
 490         while (curarg < params) {
 491                 next = (tail + 1) % MAX_EVENTS;
 492                 if (unlikely(next == head)) {
 493                         dev_err(cs->dev, "event queue full\n");
 494                         break;
 495                 }
 496
 497                 event = cs->events + tail;
 498                 event->at_state = NULL;
 499                 event->cid = cid;
 500                 event->ptr = NULL;
 501                 event->arg = NULL;
 502                 tail = next;
 503
 504                 if (rawstring) {
 505                         resp_code = RSP_STRING;
 506                         param_type = RT_STRING;
 507                 } else {
 508                         for (rt = resp_type; rt->response; ++rt)
 509                                 if (!strcmp(argv[curarg], rt->response))
 510                                         break;
 511
 512                         if (!rt->response) {
 513                                 event->type = RSP_NONE;
 514                                 gig_dbg(DEBUG_EVENT,
 515                                         "unknown modem response: '%s'\n",
 516                                         argv[curarg]);
 517                                 break;
 518                         }
 519
 520                         resp_code = rt->resp_code;
 521                         param_type = rt->type;
 522                         ++curarg;
 523                 }
 524
 525                 event->type = resp_code;
 526
 527                 switch (param_type) {
 528                 case RT_NOTHING:
 529                         break;
 530                 case RT_RING:
 531                         if (!cid) {
 532                                 dev_err(cs->dev,
 533                                         "received RING without CID!\n");
 534                                 event->type = RSP_INVAL;
 535                                 abort = 1;
 536                         } else {
 537                                 event->cid = 0;
 538                                 event->parameter = cid;
 539                                 abort = 0;
 540                         }
 541                         break;
 542                 case RT_ZSAU:
 543                         if (curarg >= params) {
 544                                 event->parameter = ZSAU_NONE;
 545                                 break;
 546                         }
 547                         for (zr = zsau_resp; zr->str; ++zr)
 548                                 if (!strcmp(argv[curarg], zr->str))
 549                                         break;
 550                         event->parameter = zr->code;
 551                         if (!zr->str)
 552                                 dev_warn(cs->dev,
 553                                          "%s: unknown parameter %s after ZSAU\n",
 554                                          __func__, argv[curarg]);
 555                         ++curarg;
 556                         break;
 557                 case RT_STRING:
 558                         if (curarg < params) {
 559                                 event->ptr = kstrdup(argv[curarg], GFP_ATOMIC);
 560                                 if (!event->ptr)
 561                                         dev_err(cs->dev, "out of memory\n");
 562                                 ++curarg;
 563                         }
 564                         gig_dbg(DEBUG_EVENT, "string==%s",
 565                                 event->ptr ? (char *) event->ptr : "NULL");
 566                         break;
 567                 case RT_ZCAU:
 568                         event->parameter = -1;
 569                         if (curarg + 1 < params) {
 570                                 u8 type, value;
 571
 572                                 i = kstrtou8(argv[curarg++], 16, &type);
 573                                 j = kstrtou8(argv[curarg++], 16, &value);
 574                                 if (i == 0 && j == 0)
 575                                         event->parameter = (type << 8) | value;
 576                         } else
 577                                 curarg = params - 1;
 578                         break;
 579                 case RT_NUMBER:
 580                         if (curarg >= params ||
 581                             kstrtoint(argv[curarg++], 10, &event->parameter))
 582                                 event->parameter = -1;
 583                         gig_dbg(DEBUG_EVENT, "parameter==%d", event->parameter);
 584                         break;
 585                 }
 586
 587                 if (resp_code == RSP_ZDLE)
 588                         cs->dle = event->parameter;
 589
 590                 if (abort)
 591                         break;
 592         }
 593
 594         cs->ev_tail = tail;
 595         spin_unlock_irqrestore(&cs->ev_lock, flags);
 596
 597         if (curarg != params)
 598                 gig_dbg(DEBUG_EVENT,
 599                         "invalid number of processed parameters: %d/%d",
 600                         curarg, params);
 601 }
 602 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
 603
 604 /* disconnect
 605  * process closing of connection associated with given AT state structure
 606  */
 607 static void disconnect(struct at_state_t **at_state_p)
 608 {
 609         unsigned long flags;
 610         struct bc_state *bcs = (*at_state_p)->bcs;
 611         struct cardstate *cs = (*at_state_p)->cs;
 612
 613         spin_lock_irqsave(&cs->lock, flags);
 614         ++(*at_state_p)->seq_index;
 615
 616         /* revert to selected idle mode */
 617         if (!cs->cidmode) {
 618                 cs->at_state.pending_commands |= PC_UMMODE;
 619                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 620                 cs->commands_pending = 1;
 621         }
 622         spin_unlock_irqrestore(&cs->lock, flags);
 623
 624         if (bcs) {
 625                 /* B channel assigned: invoke hardware specific handler */
 626                 cs->ops->close_bchannel(bcs);
 627                 /* notify LL */
 628                 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 629                         bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 630                         gigaset_isdn_hupD(bcs);
 631                 }
 632         } else {
 633                 /* no B channel assigned: just deallocate */
 634                 spin_lock_irqsave(&cs->lock, flags);
 635                 list_del(&(*at_state_p)->list);
 636                 kfree(*at_state_p);
 637                 *at_state_p = NULL;
 638                 spin_unlock_irqrestore(&cs->lock, flags);
 639         }
 640 }
 641
 642 /* get_free_channel
 643  * get a free AT state structure: either one of those associated with the
 644  * B channels of the Gigaset device, or if none of those is available,
 645  * a newly allocated one with bcs=NULL
 646  * The structure should be freed by calling disconnect() after use.
 647  */
 648 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 649                                                   int cid)
 650 /* cids: >0: siemens-cid
 651    0: without cid
 652    -1: no cid assigned yet
 653 */
 654 {
 655         unsigned long flags;
 656         int i;
 657         struct at_state_t *ret;
 658
 659         for (i = 0; i < cs->channels; ++i)
 660                 if (gigaset_get_channel(cs->bcs + i)) {
 661                         ret = &cs->bcs[i].at_state;
 662                         ret->cid = cid;
 663                         return ret;
 664                 }
 665
 666         spin_lock_irqsave(&cs->lock, flags);
 667         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 668         if (ret) {
 669                 gigaset_at_init(ret, NULL, cs, cid);
 670                 list_add(&ret->list, &cs->temp_at_states);
 671         }
 672         spin_unlock_irqrestore(&cs->lock, flags);
 673         return ret;
 674 }
 675
 676 static void init_failed(struct cardstate *cs, int mode)
 677 {
 678         int i;
 679         struct at_state_t *at_state;
 680
 681         cs->at_state.pending_commands &= ~PC_INIT;
 682         cs->mode = mode;
 683         cs->mstate = MS_UNINITIALIZED;
 684         gigaset_free_channels(cs);
 685         for (i = 0; i < cs->channels; ++i) {
 686                 at_state = &cs->bcs[i].at_state;
 687                 if (at_state->pending_commands & PC_CID) {
 688                         at_state->pending_commands &= ~PC_CID;
 689                         at_state->pending_commands |= PC_NOCID;
 690                         cs->commands_pending = 1;
 691                 }
 692         }
 693 }
 694
 695 static void schedule_init(struct cardstate *cs, int state)
 696 {
 697         if (cs->at_state.pending_commands & PC_INIT) {
 698                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 699                 return;
 700         }
 701         cs->mstate = state;
 702         cs->mode = M_UNKNOWN;
 703         gigaset_block_channels(cs);
 704         cs->at_state.pending_commands |= PC_INIT;
 705         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 706         cs->commands_pending = 1;
 707 }
 708
 709 /* Add "AT" to a command, add the cid, dle encode it, send the result to the
 710    hardware. */
 711 static void send_command(struct cardstate *cs, const char *cmd, int cid,
 712                          int dle, gfp_t kmallocflags)
 713 {
 714         struct cmdbuf_t *cb;
 715         size_t buflen;
 716
 717         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 718         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, kmallocflags);
 719         if (!cb) {
 720                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 721                 return;
 722         }
 723         if (cid > 0 && cid <= 65535)
 724                 cb->len = snprintf(cb->buf, buflen,
 725                                    dle ? "\020(AT%d%s\020)" : "AT%d%s",
 726                                    cid, cmd);
 727         else
 728                 cb->len = snprintf(cb->buf, buflen,
 729                                    dle ? "\020(AT%s\020)" : "AT%s",
 730                                    cmd);
 731         cb->offset = 0;
 732         cb->next = NULL;
 733         cb->wake_tasklet = NULL;
 734         cs->ops->write_cmd(cs, cb);
 735 }
 736
 737 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 738 {
 739         struct at_state_t *at_state;
 740         int i;
 741         unsigned long flags;
 742
 743         if (cid == 0)
 744                 return &cs->at_state;
 745
 746         for (i = 0; i < cs->channels; ++i)
 747                 if (cid == cs->bcs[i].at_state.cid)
 748                         return &cs->bcs[i].at_state;
 749
 750         spin_lock_irqsave(&cs->lock, flags);
 751
 752         list_for_each_entry(at_state, &cs->temp_at_states, list)
 753                 if (cid == at_state->cid) {
 754                         spin_unlock_irqrestore(&cs->lock, flags);
 755                         return at_state;
 756                 }
 757
 758         spin_unlock_irqrestore(&cs->lock, flags);
 759
 760         return NULL;
 761 }
 762
 763 static void bchannel_down(struct bc_state *bcs)
 764 {
 765         if (bcs->chstate & CHS_B_UP) {
 766                 bcs->chstate &= ~CHS_B_UP;
 767                 gigaset_isdn_hupB(bcs);
 768         }
 769
 770         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 771                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 772                 gigaset_isdn_hupD(bcs);
 773         }
 774
 775         gigaset_free_channel(bcs);
 776
 777         gigaset_bcs_reinit(bcs);
 778 }
 779
 780 static void bchannel_up(struct bc_state *bcs)
 781 {
 782         if (bcs->chstate & CHS_B_UP) {
 783                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 784                            __func__);
 785                 return;
 786         }
 787
 788         bcs->chstate |= CHS_B_UP;
 789         gigaset_isdn_connB(bcs);
 790 }
 791
 792 static void start_dial(struct at_state_t *at_state, void *data,
 793                        unsigned seq_index)
 794 {
 795         struct bc_state *bcs = at_state->bcs;
 796         struct cardstate *cs = at_state->cs;
 797         char **commands = data;
 798         unsigned long flags;
 799         int i;
 800
 801         bcs->chstate |= CHS_NOTIFY_LL;
 802
 803         spin_lock_irqsave(&cs->lock, flags);
 804         if (at_state->seq_index != seq_index) {
 805                 spin_unlock_irqrestore(&cs->lock, flags);
 806                 goto error;
 807         }
 808         spin_unlock_irqrestore(&cs->lock, flags);
 809
 810         for (i = 0; i < AT_NUM; ++i) {
 811                 kfree(bcs->commands[i]);
 812                 bcs->commands[i] = commands[i];
 813         }
 814
 815         at_state->pending_commands |= PC_CID;
 816         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 817         cs->commands_pending = 1;
 818         return;
 819
 820 error:
 821         for (i = 0; i < AT_NUM; ++i) {
 822                 kfree(commands[i]);
 823                 commands[i] = NULL;
 824         }
 825         at_state->pending_commands |= PC_NOCID;
 826         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 827         cs->commands_pending = 1;
 828         return;
 829 }
 830
 831 static void start_accept(struct at_state_t *at_state)
 832 {
 833         struct cardstate *cs = at_state->cs;
 834         struct bc_state *bcs = at_state->bcs;
 835         int i;
 836
 837         for (i = 0; i < AT_NUM; ++i) {
 838                 kfree(bcs->commands[i]);
 839                 bcs->commands[i] = NULL;
 840         }
 841
 842         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 843         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 844         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 845                 dev_err(at_state->cs->dev, "out of memory\n");
 846                 /* error reset */
 847                 at_state->pending_commands |= PC_HUP;
 848                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 849                 cs->commands_pending = 1;
 850                 return;
 851         }
 852
 853         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 854         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 855
 856         at_state->pending_commands |= PC_ACCEPT;
 857         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 858         cs->commands_pending = 1;
 859 }
 860
 861 static void do_start(struct cardstate *cs)
 862 {
 863         gigaset_free_channels(cs);
 864
 865         if (cs->mstate != MS_LOCKED)
 866                 schedule_init(cs, MS_INIT);
 867
 868         cs->isdn_up = 1;
 869         gigaset_isdn_start(cs);
 870
 871         cs->waiting = 0;
 872         wake_up(&cs->waitqueue);
 873 }
 874
 875 static void finish_shutdown(struct cardstate *cs)
 876 {
 877         if (cs->mstate != MS_LOCKED) {
 878                 cs->mstate = MS_UNINITIALIZED;
 879                 cs->mode = M_UNKNOWN;
 880         }
 881
 882         /* Tell the LL that the device is not available .. */
 883         if (cs->isdn_up) {
 884                 cs->isdn_up = 0;
 885                 gigaset_isdn_stop(cs);
 886         }
 887
 888         /* The rest is done by cleanup_cs () in user mode. */
 889
 890         cs->cmd_result = -ENODEV;
 891         cs->waiting = 0;
 892         wake_up(&cs->waitqueue);
 893 }
 894
 895 static void do_shutdown(struct cardstate *cs)
 896 {
 897         gigaset_block_channels(cs);
 898
 899         if (cs->mstate == MS_READY) {
 900                 cs->mstate = MS_SHUTDOWN;
 901                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 902                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 903                 cs->commands_pending = 1;
 904         } else
 905                 finish_shutdown(cs);
 906 }
 907
 908 static void do_stop(struct cardstate *cs)
 909 {
 910         unsigned long flags;
 911
 912         spin_lock_irqsave(&cs->lock, flags);
 913         cs->connected = 0;
 914         spin_unlock_irqrestore(&cs->lock, flags);
 915
 916         do_shutdown(cs);
 917 }
 918
 919 /* Entering cid mode or getting a cid failed:
 920  * try to initialize the device and try again.
 921  *
 922  * channel >= 0: getting cid for the channel failed
 923  * channel < 0:  entering cid mode failed
 924  *
 925  * returns 0 on failure
 926  */
 927 static int reinit_and_retry(struct cardstate *cs, int channel)
 928 {
 929         int i;
 930
 931         if (--cs->retry_count <= 0)
 932                 return 0;
 933
 934         for (i = 0; i < cs->channels; ++i)
 935                 if (cs->bcs[i].at_state.cid > 0)
 936                         return 0;
 937
 938         if (channel < 0)
 939                 dev_warn(cs->dev,
 940                          "Could not enter cid mode. Reinit device and try again.\n");
 941         else {
 942                 dev_warn(cs->dev,
 943                          "Could not get a call id. Reinit device and try again.\n");
 944                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 945         }
 946         schedule_init(cs, MS_INIT);
 947         return 1;
 948 }
 949
 950 static int at_state_invalid(struct cardstate *cs,
 951                             struct at_state_t *test_ptr)
 952 {
 953         unsigned long flags;
 954         unsigned channel;
 955         struct at_state_t *at_state;
 956         int retval = 0;
 957
 958         spin_lock_irqsave(&cs->lock, flags);
 959
 960         if (test_ptr == &cs->at_state)
 961                 goto exit;
 962
 963         list_for_each_entry(at_state, &cs->temp_at_states, list)
 964                 if (at_state == test_ptr)
 965                         goto exit;
 966
 967         for (channel = 0; channel < cs->channels; ++channel)
 968                 if (&cs->bcs[channel].at_state == test_ptr)
 969                         goto exit;
 970
 971         retval = 1;
 972 exit:
 973         spin_unlock_irqrestore(&cs->lock, flags);
 974         return retval;
 975 }
 976
 977 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
 978                          struct at_state_t **p_at_state)
 979 {
 980         int retval;
 981         struct at_state_t *at_state = *p_at_state;
 982
 983         retval = gigaset_isdn_icall(at_state);
 984         switch (retval) {
 985         case ICALL_ACCEPT:
 986                 break;
 987         default:
 988                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
 989                 /* --v-- fall through --v-- */
 990         case ICALL_IGNORE:
 991         case ICALL_REJECT:
 992                 /* hang up actively
 993                  * Device doc says that would reject the call.
 994                  * In fact it doesn't.
 995                  */
 996                 at_state->pending_commands |= PC_HUP;
 997                 cs->commands_pending = 1;
 998                 break;
 999         }
1000 }
1001
1002 static int do_lock(struct cardstate *cs)
1003 {
1004         int mode;
1005         int i;
1006
1007         switch (cs->mstate) {
1008         case MS_UNINITIALIZED:
1009         case MS_READY:
1010                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1011                     cs->at_state.pending_commands)
1012                         return -EBUSY;
1013
1014                 for (i = 0; i < cs->channels; ++i)
1015                         if (cs->bcs[i].at_state.pending_commands)
1016                                 return -EBUSY;
1017
1018                 if (!gigaset_get_channels(cs))
1019                         return -EBUSY;
1020
1021                 break;
1022         case MS_LOCKED:
1023                 break;
1024         default:
1025                 return -EBUSY;
1026         }
1027
1028         mode = cs->mode;
1029         cs->mstate = MS_LOCKED;
1030         cs->mode = M_UNKNOWN;
1031
1032         return mode;
1033 }
1034
1035 static int do_unlock(struct cardstate *cs)
1036 {
1037         if (cs->mstate != MS_LOCKED)
1038                 return -EINVAL;
1039
1040         cs->mstate = MS_UNINITIALIZED;
1041         cs->mode = M_UNKNOWN;
1042         gigaset_free_channels(cs);
1043         if (cs->connected)
1044                 schedule_init(cs, MS_INIT);
1045
1046         return 0;
1047 }
1048
1049 static void do_action(int action, struct cardstate *cs,
1050                       struct bc_state *bcs,
1051                       struct at_state_t **p_at_state, char **pp_command,
1052                       int *p_genresp, int *p_resp_code,
1053                       struct event_t *ev)
1054 {
1055         struct at_state_t *at_state = *p_at_state;
1056         struct at_state_t *at_state2;
1057         unsigned long flags;
1058
1059         int channel;
1060
1061         unsigned char *s, *e;
1062         int i;
1063         unsigned long val;
1064
1065         switch (action) {
1066         case ACT_NOTHING:
1067                 break;
1068         case ACT_TIMEOUT:
1069                 at_state->waiting = 1;
1070                 break;
1071         case ACT_INIT:
1072                 cs->at_state.pending_commands &= ~PC_INIT;
1073                 cs->cur_at_seq = SEQ_NONE;
1074                 cs->mode = M_UNIMODEM;
1075                 spin_lock_irqsave(&cs->lock, flags);
1076                 if (!cs->cidmode) {
1077                         spin_unlock_irqrestore(&cs->lock, flags);
1078                         gigaset_free_channels(cs);
1079                         cs->mstate = MS_READY;
1080                         break;
1081                 }
1082                 spin_unlock_irqrestore(&cs->lock, flags);
1083                 cs->at_state.pending_commands |= PC_CIDMODE;
1084                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1085                 cs->commands_pending = 1;
1086                 break;
1087         case ACT_FAILINIT:
1088                 dev_warn(cs->dev, "Could not initialize the device.\n");
1089                 cs->dle = 0;
1090                 init_failed(cs, M_UNKNOWN);
1091                 cs->cur_at_seq = SEQ_NONE;
1092                 break;
1093         case ACT_CONFIGMODE:
1094                 init_failed(cs, M_CONFIG);
1095                 cs->cur_at_seq = SEQ_NONE;
1096                 break;
1097         case ACT_SETDLE1:
1098                 cs->dle = 1;
1099                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1100                 cs->inbuf[0].inputstate &=
1101                         ~(INS_command | INS_DLE_command);
1102                 break;
1103         case ACT_SETDLE0:
1104                 cs->dle = 0;
1105                 cs->inbuf[0].inputstate =
1106                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1107                         | INS_command;
1108                 break;
1109         case ACT_CMODESET:
1110                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1111                         gigaset_free_channels(cs);
1112                         cs->mstate = MS_READY;
1113                 }
1114                 cs->mode = M_CID;
1115                 cs->cur_at_seq = SEQ_NONE;
1116                 break;
1117         case ACT_UMODESET:
1118                 cs->mode = M_UNIMODEM;
1119                 cs->cur_at_seq = SEQ_NONE;
1120                 break;
1121         case ACT_FAILCMODE:
1122                 cs->cur_at_seq = SEQ_NONE;
1123                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1124                         init_failed(cs, M_UNKNOWN);
1125                         break;
1126                 }
1127                 if (!reinit_and_retry(cs, -1))
1128                         schedule_init(cs, MS_RECOVER);
1129                 break;
1130         case ACT_FAILUMODE:
1131                 cs->cur_at_seq = SEQ_NONE;
1132                 schedule_init(cs, MS_RECOVER);
1133                 break;
1134         case ACT_HUPMODEM:
1135                 /* send "+++" (hangup in unimodem mode) */
1136                 if (cs->connected) {
1137                         struct cmdbuf_t *cb;
1138
1139                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1140                         if (!cb) {
1141                                 dev_err(cs->dev, "%s: out of memory\n",
1142                                         __func__);
1143                                 return;
1144                         }
1145                         memcpy(cb->buf, "+++", 3);
1146                         cb->len = 3;
1147                         cb->offset = 0;
1148                         cb->next = NULL;
1149                         cb->wake_tasklet = NULL;
1150                         cs->ops->write_cmd(cs, cb);
1151                 }
1152                 break;
1153         case ACT_RING:
1154                 /* get fresh AT state structure for new CID */
1155                 at_state2 = get_free_channel(cs, ev->parameter);
1156                 if (!at_state2) {
1157                         dev_warn(cs->dev,
1158                                  "RING ignored: could not allocate channel structure\n");
1159                         break;
1160                 }
1161
1162                 /* initialize AT state structure
1163                  * note that bcs may be NULL if no B channel is free
1164                  */
1165                 at_state2->ConState = 700;
1166                 for (i = 0; i < STR_NUM; ++i) {
1167                         kfree(at_state2->str_var[i]);
1168                         at_state2->str_var[i] = NULL;
1169                 }
1170                 at_state2->int_var[VAR_ZCTP] = -1;
1171
1172                 spin_lock_irqsave(&cs->lock, flags);
1173                 at_state2->timer_expires = RING_TIMEOUT;
1174                 at_state2->timer_active = 1;
1175                 spin_unlock_irqrestore(&cs->lock, flags);
1176                 break;
1177         case ACT_ICALL:
1178                 handle_icall(cs, bcs, p_at_state);
1179                 break;
1180         case ACT_FAILSDOWN:
1181                 dev_warn(cs->dev, "Could not shut down the device.\n");
1182                 /* fall through */
1183         case ACT_FAKESDOWN:
1184         case ACT_SDOWN:
1185                 cs->cur_at_seq = SEQ_NONE;
1186                 finish_shutdown(cs);
1187                 break;
1188         case ACT_CONNECT:
1189                 if (cs->onechannel) {
1190                         at_state->pending_commands |= PC_DLE1;
1191                         cs->commands_pending = 1;
1192                         break;
1193                 }
1194                 bcs->chstate |= CHS_D_UP;
1195                 gigaset_isdn_connD(bcs);
1196                 cs->ops->init_bchannel(bcs);
1197                 break;
1198         case ACT_DLE1:
1199                 cs->cur_at_seq = SEQ_NONE;
1200                 bcs = cs->bcs + cs->curchannel;
1201
1202                 bcs->chstate |= CHS_D_UP;
1203                 gigaset_isdn_connD(bcs);
1204                 cs->ops->init_bchannel(bcs);
1205                 break;
1206         case ACT_FAKEHUP:
1207                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1208                 /* fall through */
1209         case ACT_DISCONNECT:
1210                 cs->cur_at_seq = SEQ_NONE;
1211                 at_state->cid = -1;
1212                 if (bcs && cs->onechannel && cs->dle) {
1213                         /* Check for other open channels not needed:
1214                          * DLE only used for M10x with one B channel.
1215                          */
1216                         at_state->pending_commands |= PC_DLE0;
1217                         cs->commands_pending = 1;
1218                 } else
1219                         disconnect(p_at_state);
1220                 break;
1221         case ACT_FAKEDLE0:
1222                 at_state->int_var[VAR_ZDLE] = 0;
1223                 cs->dle = 0;
1224                 /* fall through */
1225         case ACT_DLE0:
1226                 cs->cur_at_seq = SEQ_NONE;
1227                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1228                 disconnect(&at_state2);
1229                 break;
1230         case ACT_ABORTHUP:
1231                 cs->cur_at_seq = SEQ_NONE;
1232                 dev_warn(cs->dev, "Could not hang up.\n");
1233                 at_state->cid = -1;
1234                 if (bcs && cs->onechannel)
1235                         at_state->pending_commands |= PC_DLE0;
1236                 else
1237                         disconnect(p_at_state);
1238                 schedule_init(cs, MS_RECOVER);
1239                 break;
1240         case ACT_FAILDLE0:
1241                 cs->cur_at_seq = SEQ_NONE;
1242                 dev_warn(cs->dev, "Could not leave DLE mode.\n");
1243                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1244                 disconnect(&at_state2);
1245                 schedule_init(cs, MS_RECOVER);
1246                 break;
1247         case ACT_FAILDLE1:
1248                 cs->cur_at_seq = SEQ_NONE;
1249                 dev_warn(cs->dev,
1250                          "Could not enter DLE mode. Trying to hang up.\n");
1251                 channel = cs->curchannel;
1252                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1253                 cs->commands_pending = 1;
1254                 break;
1255
1256         case ACT_CID: /* got cid; start dialing */
1257                 cs->cur_at_seq = SEQ_NONE;
1258                 channel = cs->curchannel;
1259                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1260                         cs->bcs[channel].at_state.cid = ev->parameter;
1261                         cs->bcs[channel].at_state.pending_commands |=
1262                                 PC_DIAL;
1263                         cs->commands_pending = 1;
1264                         break;
1265                 }
1266                 /* fall through */
1267         case ACT_FAILCID:
1268                 cs->cur_at_seq = SEQ_NONE;
1269                 channel = cs->curchannel;
1270                 if (!reinit_and_retry(cs, channel)) {
1271                         dev_warn(cs->dev,
1272                                  "Could not get a call ID. Cannot dial.\n");
1273                         at_state2 = &cs->bcs[channel].at_state;
1274                         disconnect(&at_state2);
1275                 }
1276                 break;
1277         case ACT_ABORTCID:
1278                 cs->cur_at_seq = SEQ_NONE;
1279                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1280                 disconnect(&at_state2);
1281                 break;
1282
1283         case ACT_DIALING:
1284         case ACT_ACCEPTED:
1285                 cs->cur_at_seq = SEQ_NONE;
1286                 break;
1287
1288         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1289                 disconnect(p_at_state);
1290                 break;
1291
1292         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1293                 cs->cur_at_seq = SEQ_NONE;
1294                 at_state->pending_commands |= PC_HUP;
1295                 cs->commands_pending = 1;
1296                 break;
1297
1298         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1299         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1300         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1301                 at_state->pending_commands |= PC_HUP;
1302                 cs->commands_pending = 1;
1303                 break;
1304         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1305                                are not handled properly anymore */
1306                 at_state->getstring = 1;
1307                 break;
1308         case ACT_SETVER:
1309                 if (!ev->ptr) {
1310                         *p_genresp = 1;
1311                         *p_resp_code = RSP_ERROR;
1312                         break;
1313                 }
1314                 s = ev->ptr;
1315
1316                 if (!strcmp(s, "OK")) {
1317                         *p_genresp = 1;
1318                         *p_resp_code = RSP_ERROR;
1319                         break;
1320                 }
1321
1322                 for (i = 0; i < 4; ++i) {
1323                         val = simple_strtoul(s, (char **) &e, 10);
1324                         if (val > INT_MAX || e == s)
1325                                 break;
1326                         if (i == 3) {
1327                                 if (*e)
1328                                         break;
1329                         } else if (*e != '.')
1330                                 break;
1331                         else
1332                                 s = e + 1;
1333                         cs->fwver[i] = val;
1334                 }
1335                 if (i != 4) {
1336                         *p_genresp = 1;
1337                         *p_resp_code = RSP_ERROR;
1338                         break;
1339                 }
1340                 /*at_state->getstring = 1;*/
1341                 cs->gotfwver = 0;
1342                 break;
1343         case ACT_GOTVER:
1344                 if (cs->gotfwver == 0) {
1345                         cs->gotfwver = 1;
1346                         gig_dbg(DEBUG_EVENT,
1347                                 "firmware version %02d.%03d.%02d.%02d",
1348                                 cs->fwver[0], cs->fwver[1],
1349                                 cs->fwver[2], cs->fwver[3]);
1350                         break;
1351                 }
1352                 /* fall through */
1353         case ACT_FAILVER:
1354                 cs->gotfwver = -1;
1355                 dev_err(cs->dev, "could not read firmware version.\n");
1356                 break;
1357         case ACT_ERROR:
1358                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1359                         __func__, at_state->ConState);
1360                 cs->cur_at_seq = SEQ_NONE;
1361                 break;
1362         case ACT_DEBUG:
1363                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1364                         __func__, ev->type, at_state->ConState);
1365                 break;
1366         case ACT_WARN:
1367                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1368                          __func__, ev->type, at_state->ConState);
1369                 break;
1370         case ACT_ZCAU:
1371                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1372                          ev->parameter, at_state->ConState);
1373                 break;
1374
1375                 /* events from the LL */
1376         case ACT_DIAL:
1377                 start_dial(at_state, ev->ptr, ev->parameter);
1378                 break;
1379         case ACT_ACCEPT:
1380                 start_accept(at_state);
1381                 break;
1382         case ACT_HUP:
1383                 at_state->pending_commands |= PC_HUP;
1384                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1385                 cs->commands_pending = 1;
1386                 break;
1387
1388                 /* hotplug events */
1389         case ACT_STOP:
1390                 do_stop(cs);
1391                 break;
1392         case ACT_START:
1393                 do_start(cs);
1394                 break;
1395
1396                 /* events from the interface */
1397         case ACT_IF_LOCK:
1398                 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1399                 cs->waiting = 0;
1400                 wake_up(&cs->waitqueue);
1401                 break;
1402         case ACT_IF_VER:
1403                 if (ev->parameter != 0)
1404                         cs->cmd_result = -EINVAL;
1405                 else if (cs->gotfwver != 1) {
1406                         cs->cmd_result = -ENOENT;
1407                 } else {
1408                         memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1409                         cs->cmd_result = 0;
1410                 }
1411                 cs->waiting = 0;
1412                 wake_up(&cs->waitqueue);
1413                 break;
1414
1415                 /* events from the proc file system */
1416         case ACT_PROC_CIDMODE:
1417                 spin_lock_irqsave(&cs->lock, flags);
1418                 if (ev->parameter != cs->cidmode) {
1419                         cs->cidmode = ev->parameter;
1420                         if (ev->parameter) {
1421                                 cs->at_state.pending_commands |= PC_CIDMODE;
1422                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1423                         } else {
1424                                 cs->at_state.pending_commands |= PC_UMMODE;
1425                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1426                         }
1427                         cs->commands_pending = 1;
1428                 }
1429                 spin_unlock_irqrestore(&cs->lock, flags);
1430                 cs->waiting = 0;
1431                 wake_up(&cs->waitqueue);
1432                 break;
1433
1434                 /* events from the hardware drivers */
1435         case ACT_NOTIFY_BC_DOWN:
1436                 bchannel_down(bcs);
1437                 break;
1438         case ACT_NOTIFY_BC_UP:
1439                 bchannel_up(bcs);
1440                 break;
1441         case ACT_SHUTDOWN:
1442                 do_shutdown(cs);
1443                 break;
1444
1445
1446         default:
1447                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1448                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1449                         if (!*pp_command) {
1450                                 *p_genresp = 1;
1451                                 *p_resp_code = RSP_NULL;
1452                         }
1453                 } else
1454                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1455         }
1456 }
1457
1458 /* State machine to do the calling and hangup procedure */
1459 static void process_event(struct cardstate *cs, struct event_t *ev)
1460 {
1461         struct bc_state *bcs;
1462         char *p_command = NULL;
1463         struct reply_t *rep;
1464         int rcode;
1465         int genresp = 0;
1466         int resp_code = RSP_ERROR;
1467         int sendcid;
1468         struct at_state_t *at_state;
1469         int index;
1470         int curact;
1471         unsigned long flags;
1472
1473         if (ev->cid >= 0) {
1474                 at_state = at_state_from_cid(cs, ev->cid);
1475                 if (!at_state) {
1476                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1477                                 ev->type, ev->cid);
1478                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1479                                           NULL, 0, NULL);
1480                         return;
1481                 }
1482         } else {
1483                 at_state = ev->at_state;
1484                 if (at_state_invalid(cs, at_state)) {
1485                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1486                                 at_state);
1487                         return;
1488                 }
1489         }
1490
1491         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1492                 at_state->ConState, ev->type);
1493
1494         bcs = at_state->bcs;
1495         sendcid = at_state->cid;
1496
1497         /* Setting the pointer to the dial array */
1498         rep = at_state->replystruct;
1499
1500         spin_lock_irqsave(&cs->lock, flags);
1501         if (ev->type == EV_TIMEOUT) {
1502                 if (ev->parameter != at_state->timer_index
1503                     || !at_state->timer_active) {
1504                         ev->type = RSP_NONE; /* old timeout */
1505                         gig_dbg(DEBUG_EVENT, "old timeout");
1506                 } else if (!at_state->waiting)
1507                         gig_dbg(DEBUG_EVENT, "timeout occurred");
1508                 else
1509                         gig_dbg(DEBUG_EVENT, "stopped waiting");
1510         }
1511         spin_unlock_irqrestore(&cs->lock, flags);
1512
1513         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1514            or at_state->str_var[STR_XXXX], set it */
1515         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1516                 index = ev->type - RSP_VAR;
1517                 at_state->int_var[index] = ev->parameter;
1518         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1519                 index = ev->type - RSP_STR;
1520                 kfree(at_state->str_var[index]);
1521                 at_state->str_var[index] = ev->ptr;
1522                 ev->ptr = NULL; /* prevent process_events() from
1523                                    deallocating ptr */
1524         }
1525
1526         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1527                 at_state->getstring = 0;
1528
1529         /* Search row in dial array which matches modem response and current
1530            constate */
1531         for (;; rep++) {
1532                 rcode = rep->resp_code;
1533                 if (rcode == RSP_LAST) {
1534                         /* found nothing...*/
1535                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1536                                  "resp_code %d in ConState %d!\n",
1537                                  __func__, ev->type, at_state->ConState);
1538                         return;
1539                 }
1540                 if ((rcode == RSP_ANY || rcode == ev->type)
1541                     && ((int) at_state->ConState >= rep->min_ConState)
1542                     && (rep->max_ConState < 0
1543                         || (int) at_state->ConState <= rep->max_ConState)
1544                     && (rep->parameter < 0 || rep->parameter == ev->parameter))
1545                         break;
1546         }
1547
1548         p_command = rep->command;
1549
1550         at_state->waiting = 0;
1551         for (curact = 0; curact < MAXACT; ++curact) {
1552                 /* The row tells us what we should do  ..
1553                  */
1554                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1555                           &genresp, &resp_code, ev);
1556                 if (!at_state)
1557                         break; /* may be freed after disconnect */
1558         }
1559
1560         if (at_state) {
1561                 /* Jump to the next con-state regarding the array */
1562                 if (rep->new_ConState >= 0)
1563                         at_state->ConState = rep->new_ConState;
1564
1565                 if (genresp) {
1566                         spin_lock_irqsave(&cs->lock, flags);
1567                         at_state->timer_expires = 0;
1568                         at_state->timer_active = 0;
1569                         spin_unlock_irqrestore(&cs->lock, flags);
1570                         gigaset_add_event(cs, at_state, resp_code,
1571                                           NULL, 0, NULL);
1572                 } else {
1573                         /* Send command to modem if not NULL... */
1574                         if (p_command) {
1575                                 if (cs->connected)
1576                                         send_command(cs, p_command,
1577                                                      sendcid, cs->dle,
1578                                                      GFP_ATOMIC);
1579                                 else
1580                                         gigaset_add_event(cs, at_state,
1581                                                           RSP_NODEV,
1582                                                           NULL, 0, NULL);
1583                         }
1584
1585                         spin_lock_irqsave(&cs->lock, flags);
1586                         if (!rep->timeout) {
1587                                 at_state->timer_expires = 0;
1588                                 at_state->timer_active = 0;
1589                         } else if (rep->timeout > 0) { /* new timeout */
1590                                 at_state->timer_expires = rep->timeout * 10;
1591                                 at_state->timer_active = 1;
1592                                 ++at_state->timer_index;
1593                         }
1594                         spin_unlock_irqrestore(&cs->lock, flags);
1595                 }
1596         }
1597 }
1598
1599 static void schedule_sequence(struct cardstate *cs,
1600                               struct at_state_t *at_state, int sequence)
1601 {
1602         cs->cur_at_seq = sequence;
1603         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1604 }
1605
1606 static void process_command_flags(struct cardstate *cs)
1607 {
1608         struct at_state_t *at_state = NULL;
1609         struct bc_state *bcs;
1610         int i;
1611         int sequence;
1612         unsigned long flags;
1613
1614         cs->commands_pending = 0;
1615
1616         if (cs->cur_at_seq) {
1617                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1618                 return;
1619         }
1620
1621         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1622
1623         sequence = SEQ_NONE;
1624
1625         /* clear pending_commands and hangup channels on shutdown */
1626         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1627                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1628                 for (i = 0; i < cs->channels; ++i) {
1629                         bcs = cs->bcs + i;
1630                         at_state = &bcs->at_state;
1631                         at_state->pending_commands &=
1632                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1633                         if (at_state->cid > 0)
1634                                 at_state->pending_commands |= PC_HUP;
1635                         if (at_state->pending_commands & PC_CID) {
1636                                 at_state->pending_commands |= PC_NOCID;
1637                                 at_state->pending_commands &= ~PC_CID;
1638                         }
1639                 }
1640         }
1641
1642         /* clear pending_commands and hangup channels on reset */
1643         if (cs->at_state.pending_commands & PC_INIT) {
1644                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1645                 for (i = 0; i < cs->channels; ++i) {
1646                         bcs = cs->bcs + i;
1647                         at_state = &bcs->at_state;
1648                         at_state->pending_commands &=
1649                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1650                         if (at_state->cid > 0)
1651                                 at_state->pending_commands |= PC_HUP;
1652                         if (cs->mstate == MS_RECOVER) {
1653                                 if (at_state->pending_commands & PC_CID) {
1654                                         at_state->pending_commands |= PC_NOCID;
1655                                         at_state->pending_commands &= ~PC_CID;
1656                                 }
1657                         }
1658                 }
1659         }
1660
1661         /* only switch back to unimodem mode if no commands are pending and
1662          * no channels are up */
1663         spin_lock_irqsave(&cs->lock, flags);
1664         if (cs->at_state.pending_commands == PC_UMMODE
1665             && !cs->cidmode
1666             && list_empty(&cs->temp_at_states)
1667             && cs->mode == M_CID) {
1668                 sequence = SEQ_UMMODE;
1669                 at_state = &cs->at_state;
1670                 for (i = 0; i < cs->channels; ++i) {
1671                         bcs = cs->bcs + i;
1672                         if (bcs->at_state.pending_commands ||
1673                             bcs->at_state.cid > 0) {
1674                                 sequence = SEQ_NONE;
1675                                 break;
1676                         }
1677                 }
1678         }
1679         spin_unlock_irqrestore(&cs->lock, flags);
1680         cs->at_state.pending_commands &= ~PC_UMMODE;
1681         if (sequence != SEQ_NONE) {
1682                 schedule_sequence(cs, at_state, sequence);
1683                 return;
1684         }
1685
1686         for (i = 0; i < cs->channels; ++i) {
1687                 bcs = cs->bcs + i;
1688                 if (bcs->at_state.pending_commands & PC_HUP) {
1689                         bcs->at_state.pending_commands &= ~PC_HUP;
1690                         if (bcs->at_state.pending_commands & PC_CID) {
1691                                 /* not yet dialing: PC_NOCID is sufficient */
1692                                 bcs->at_state.pending_commands |= PC_NOCID;
1693                                 bcs->at_state.pending_commands &= ~PC_CID;
1694                         } else {
1695                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1696                                 return;
1697                         }
1698                 }
1699                 if (bcs->at_state.pending_commands & PC_NOCID) {
1700                         bcs->at_state.pending_commands &= ~PC_NOCID;
1701                         cs->curchannel = bcs->channel;
1702                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1703                         return;
1704                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1705                         bcs->at_state.pending_commands &= ~PC_DLE0;
1706                         cs->curchannel = bcs->channel;
1707                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1708                         return;
1709                 }
1710         }
1711
1712         list_for_each_entry(at_state, &cs->temp_at_states, list)
1713                 if (at_state->pending_commands & PC_HUP) {
1714                         at_state->pending_commands &= ~PC_HUP;
1715                         schedule_sequence(cs, at_state, SEQ_HUP);
1716                         return;
1717                 }
1718
1719         if (cs->at_state.pending_commands & PC_INIT) {
1720                 cs->at_state.pending_commands &= ~PC_INIT;
1721                 cs->dle = 0;
1722                 cs->inbuf->inputstate = INS_command;
1723                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1724                 return;
1725         }
1726         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1727                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1728                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1729                 return;
1730         }
1731         if (cs->at_state.pending_commands & PC_CIDMODE) {
1732                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1733                 if (cs->mode == M_UNIMODEM) {
1734                         cs->retry_count = 1;
1735                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1736                         return;
1737                 }
1738         }
1739
1740         for (i = 0; i < cs->channels; ++i) {
1741                 bcs = cs->bcs + i;
1742                 if (bcs->at_state.pending_commands & PC_DLE1) {
1743                         bcs->at_state.pending_commands &= ~PC_DLE1;
1744                         cs->curchannel = bcs->channel;
1745                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1746                         return;
1747                 }
1748                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1749                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1750                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1751                         return;
1752                 }
1753                 if (bcs->at_state.pending_commands & PC_DIAL) {
1754                         bcs->at_state.pending_commands &= ~PC_DIAL;
1755                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1756                         return;
1757                 }
1758                 if (bcs->at_state.pending_commands & PC_CID) {
1759                         switch (cs->mode) {
1760                         case M_UNIMODEM:
1761                                 cs->at_state.pending_commands |= PC_CIDMODE;
1762                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1763                                 cs->commands_pending = 1;
1764                                 return;
1765                         case M_UNKNOWN:
1766                                 schedule_init(cs, MS_INIT);
1767                                 return;
1768                         }
1769                         bcs->at_state.pending_commands &= ~PC_CID;
1770                         cs->curchannel = bcs->channel;
1771                         cs->retry_count = 2;
1772                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1773                         return;
1774                 }
1775         }
1776 }
1777
1778 static void process_events(struct cardstate *cs)
1779 {
1780         struct event_t *ev;
1781         unsigned head, tail;
1782         int i;
1783         int check_flags = 0;
1784         int was_busy;
1785         unsigned long flags;
1786
1787         spin_lock_irqsave(&cs->ev_lock, flags);
1788         head = cs->ev_head;
1789
1790         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1791                 tail = cs->ev_tail;
1792                 if (tail == head) {
1793                         if (!check_flags && !cs->commands_pending)
1794                                 break;
1795                         check_flags = 0;
1796                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1797                         process_command_flags(cs);
1798                         spin_lock_irqsave(&cs->ev_lock, flags);
1799                         tail = cs->ev_tail;
1800                         if (tail == head) {
1801                                 if (!cs->commands_pending)
1802                                         break;
1803                                 continue;
1804                         }
1805                 }
1806
1807                 ev = cs->events + head;
1808                 was_busy = cs->cur_at_seq != SEQ_NONE;
1809                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1810                 process_event(cs, ev);
1811                 spin_lock_irqsave(&cs->ev_lock, flags);
1812                 kfree(ev->ptr);
1813                 ev->ptr = NULL;
1814                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1815                         check_flags = 1;
1816
1817                 head = (head + 1) % MAX_EVENTS;
1818                 cs->ev_head = head;
1819         }
1820
1821         spin_unlock_irqrestore(&cs->ev_lock, flags);
1822
1823         if (i == 2 * MAX_EVENTS) {
1824                 dev_err(cs->dev,
1825                         "infinite loop in process_events; aborting.\n");
1826         }
1827 }
1828
1829 /* tasklet scheduled on any event received from the Gigaset device
1830  * parameter:
1831  *      data    ISDN controller state structure
1832  */
1833 void gigaset_handle_event(unsigned long data)
1834 {
1835         struct cardstate *cs = (struct cardstate *) data;
1836
1837         /* handle incoming data on control/common channel */
1838         if (cs->inbuf->head != cs->inbuf->tail) {
1839                 gig_dbg(DEBUG_INTR, "processing new data");
1840                 cs->ops->handle_input(cs->inbuf);
1841         }
1842
1843         process_events(cs);
1844 }