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 /* retrieve CID from parsed response
 393  * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
 394  */
 395 static int cid_of_response(char *s)
 396 {
 397         int cid;
 398         int rc;
 399
 400         if (s[-1] != ';')
 401                 return 0;       /* no CID separator */
 402         rc = kstrtoint(s, 10, &cid);
 403         if (rc)
 404                 return 0;       /* CID not numeric */
 405         if (cid < 1 || cid > 65535)
 406                 return -1;      /* CID out of range */
 407         return cid;
 408 }
 409
 410 /**
 411  * gigaset_handle_modem_response() - process received modem response
 412  * @cs:         device descriptor structure.
 413  *
 414  * Called by asyncdata/isocdata if a block of data received from the
 415  * device must be processed as a modem command response. The data is
 416  * already in the cs structure.
 417  */
 418 void gigaset_handle_modem_response(struct cardstate *cs)
 419 {
 420         unsigned char *argv[MAX_REC_PARAMS + 1];
 421         int params;
 422         int i, j;
 423         const struct resp_type_t *rt;
 424         const struct zsau_resp_t *zr;
 425         int curarg;
 426         unsigned long flags;
 427         unsigned next, tail, head;
 428         struct event_t *event;
 429         int resp_code;
 430         int param_type;
 431         int abort;
 432         size_t len;
 433         int cid;
 434         int rawstring;
 435
 436         len = cs->cbytes;
 437         if (!len) {
 438                 /* ignore additional LFs/CRs (M10x config mode or cx100) */
 439                 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[0]);
 440                 return;
 441         }
 442         cs->respdata[len] = 0;
 443         argv[0] = cs->respdata;
 444         params = 1;
 445         if (cs->at_state.getstring) {
 446                 /* getstring only allowed without cid at the moment */
 447                 cs->at_state.getstring = 0;
 448                 rawstring = 1;
 449                 cid = 0;
 450         } else {
 451                 /* parse line */
 452                 for (i = 0; i < len; i++)
 453                         switch (cs->respdata[i]) {
 454                         case ';':
 455                         case ',':
 456                         case '=':
 457                                 if (params > MAX_REC_PARAMS) {
 458                                         dev_warn(cs->dev,
 459                                                  "too many parameters in response\n");
 460                                         /* need last parameter (might be CID) */
 461                                         params--;
 462                                 }
 463                                 argv[params++] = cs->respdata + i + 1;
 464                         }
 465
 466                 rawstring = 0;
 467                 cid = params > 1 ? cid_of_response(argv[params - 1]) : 0;
 468                 if (cid < 0) {
 469                         gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
 470                                           NULL, 0, NULL);
 471                         return;
 472                 }
 473
 474                 for (j = 1; j < params; ++j)
 475                         argv[j][-1] = 0;
 476
 477                 gig_dbg(DEBUG_EVENT, "CMD received: %s", argv[0]);
 478                 if (cid) {
 479                         --params;
 480                         gig_dbg(DEBUG_EVENT, "CID: %s", argv[params]);
 481                 }
 482                 gig_dbg(DEBUG_EVENT, "available params: %d", params - 1);
 483                 for (j = 1; j < params; j++)
 484                         gig_dbg(DEBUG_EVENT, "param %d: %s", j, argv[j]);
 485         }
 486
 487         spin_lock_irqsave(&cs->ev_lock, flags);
 488         head = cs->ev_head;
 489         tail = cs->ev_tail;
 490
 491         abort = 1;
 492         curarg = 0;
 493         while (curarg < params) {
 494                 next = (tail + 1) % MAX_EVENTS;
 495                 if (unlikely(next == head)) {
 496                         dev_err(cs->dev, "event queue full\n");
 497                         break;
 498                 }
 499
 500                 event = cs->events + tail;
 501                 event->at_state = NULL;
 502                 event->cid = cid;
 503                 event->ptr = NULL;
 504                 event->arg = NULL;
 505                 tail = next;
 506
 507                 if (rawstring) {
 508                         resp_code = RSP_STRING;
 509                         param_type = RT_STRING;
 510                 } else {
 511                         for (rt = resp_type; rt->response; ++rt)
 512                                 if (!strcmp(argv[curarg], rt->response))
 513                                         break;
 514
 515                         if (!rt->response) {
 516                                 event->type = RSP_NONE;
 517                                 gig_dbg(DEBUG_EVENT,
 518                                         "unknown modem response: '%s'\n",
 519                                         argv[curarg]);
 520                                 break;
 521                         }
 522
 523                         resp_code = rt->resp_code;
 524                         param_type = rt->type;
 525                         ++curarg;
 526                 }
 527
 528                 event->type = resp_code;
 529
 530                 switch (param_type) {
 531                 case RT_NOTHING:
 532                         break;
 533                 case RT_RING:
 534                         if (!cid) {
 535                                 dev_err(cs->dev,
 536                                         "received RING without CID!\n");
 537                                 event->type = RSP_INVAL;
 538                                 abort = 1;
 539                         } else {
 540                                 event->cid = 0;
 541                                 event->parameter = cid;
 542                                 abort = 0;
 543                         }
 544                         break;
 545                 case RT_ZSAU:
 546                         if (curarg >= params) {
 547                                 event->parameter = ZSAU_NONE;
 548                                 break;
 549                         }
 550                         for (zr = zsau_resp; zr->str; ++zr)
 551                                 if (!strcmp(argv[curarg], zr->str))
 552                                         break;
 553                         event->parameter = zr->code;
 554                         if (!zr->str)
 555                                 dev_warn(cs->dev,
 556                                          "%s: unknown parameter %s after ZSAU\n",
 557                                          __func__, argv[curarg]);
 558                         ++curarg;
 559                         break;
 560                 case RT_STRING:
 561                         if (curarg < params) {
 562                                 event->ptr = kstrdup(argv[curarg], GFP_ATOMIC);
 563                                 if (!event->ptr)
 564                                         dev_err(cs->dev, "out of memory\n");
 565                                 ++curarg;
 566                         }
 567                         gig_dbg(DEBUG_EVENT, "string==%s",
 568                                 event->ptr ? (char *) event->ptr : "NULL");
 569                         break;
 570                 case RT_ZCAU:
 571                         event->parameter = -1;
 572                         if (curarg + 1 < params) {
 573                                 u8 type, value;
 574
 575                                 i = kstrtou8(argv[curarg++], 16, &type);
 576                                 j = kstrtou8(argv[curarg++], 16, &value);
 577                                 if (i == 0 && j == 0)
 578                                         event->parameter = (type << 8) | value;
 579                         } else
 580                                 curarg = params - 1;
 581                         break;
 582                 case RT_NUMBER:
 583                         if (curarg >= params ||
 584                             kstrtoint(argv[curarg++], 10, &event->parameter))
 585                                 event->parameter = -1;
 586                         gig_dbg(DEBUG_EVENT, "parameter==%d", event->parameter);
 587                         break;
 588                 }
 589
 590                 if (resp_code == RSP_ZDLE)
 591                         cs->dle = event->parameter;
 592
 593                 if (abort)
 594                         break;
 595         }
 596
 597         cs->ev_tail = tail;
 598         spin_unlock_irqrestore(&cs->ev_lock, flags);
 599
 600         if (curarg != params)
 601                 gig_dbg(DEBUG_EVENT,
 602                         "invalid number of processed parameters: %d/%d",
 603                         curarg, params);
 604 }
 605 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
 606
 607 /* disconnect
 608  * process closing of connection associated with given AT state structure
 609  */
 610 static void disconnect(struct at_state_t **at_state_p)
 611 {
 612         unsigned long flags;
 613         struct bc_state *bcs = (*at_state_p)->bcs;
 614         struct cardstate *cs = (*at_state_p)->cs;
 615
 616         spin_lock_irqsave(&cs->lock, flags);
 617         ++(*at_state_p)->seq_index;
 618
 619         /* revert to selected idle mode */
 620         if (!cs->cidmode) {
 621                 cs->at_state.pending_commands |= PC_UMMODE;
 622                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 623                 cs->commands_pending = 1;
 624         }
 625         spin_unlock_irqrestore(&cs->lock, flags);
 626
 627         if (bcs) {
 628                 /* B channel assigned: invoke hardware specific handler */
 629                 cs->ops->close_bchannel(bcs);
 630                 /* notify LL */
 631                 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 632                         bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 633                         gigaset_isdn_hupD(bcs);
 634                 }
 635         } else {
 636                 /* no B channel assigned: just deallocate */
 637                 spin_lock_irqsave(&cs->lock, flags);
 638                 list_del(&(*at_state_p)->list);
 639                 kfree(*at_state_p);
 640                 *at_state_p = NULL;
 641                 spin_unlock_irqrestore(&cs->lock, flags);
 642         }
 643 }
 644
 645 /* get_free_channel
 646  * get a free AT state structure: either one of those associated with the
 647  * B channels of the Gigaset device, or if none of those is available,
 648  * a newly allocated one with bcs=NULL
 649  * The structure should be freed by calling disconnect() after use.
 650  */
 651 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 652                                                   int cid)
 653 /* cids: >0: siemens-cid
 654  *        0: without cid
 655  *       -1: no cid assigned yet
 656  */
 657 {
 658         unsigned long flags;
 659         int i;
 660         struct at_state_t *ret;
 661
 662         for (i = 0; i < cs->channels; ++i)
 663                 if (gigaset_get_channel(cs->bcs + i) >= 0) {
 664                         ret = &cs->bcs[i].at_state;
 665                         ret->cid = cid;
 666                         return ret;
 667                 }
 668
 669         spin_lock_irqsave(&cs->lock, flags);
 670         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 671         if (ret) {
 672                 gigaset_at_init(ret, NULL, cs, cid);
 673                 list_add(&ret->list, &cs->temp_at_states);
 674         }
 675         spin_unlock_irqrestore(&cs->lock, flags);
 676         return ret;
 677 }
 678
 679 static void init_failed(struct cardstate *cs, int mode)
 680 {
 681         int i;
 682         struct at_state_t *at_state;
 683
 684         cs->at_state.pending_commands &= ~PC_INIT;
 685         cs->mode = mode;
 686         cs->mstate = MS_UNINITIALIZED;
 687         gigaset_free_channels(cs);
 688         for (i = 0; i < cs->channels; ++i) {
 689                 at_state = &cs->bcs[i].at_state;
 690                 if (at_state->pending_commands & PC_CID) {
 691                         at_state->pending_commands &= ~PC_CID;
 692                         at_state->pending_commands |= PC_NOCID;
 693                         cs->commands_pending = 1;
 694                 }
 695         }
 696 }
 697
 698 static void schedule_init(struct cardstate *cs, int state)
 699 {
 700         if (cs->at_state.pending_commands & PC_INIT) {
 701                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 702                 return;
 703         }
 704         cs->mstate = state;
 705         cs->mode = M_UNKNOWN;
 706         gigaset_block_channels(cs);
 707         cs->at_state.pending_commands |= PC_INIT;
 708         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 709         cs->commands_pending = 1;
 710 }
 711
 712 /* send an AT command
 713  * adding the "AT" prefix, cid and DLE encapsulation as appropriate
 714  */
 715 static void send_command(struct cardstate *cs, const char *cmd,
 716                          struct at_state_t *at_state)
 717 {
 718         int cid = at_state->cid;
 719         struct cmdbuf_t *cb;
 720         size_t buflen;
 721
 722         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 723         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, GFP_ATOMIC);
 724         if (!cb) {
 725                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 726                 return;
 727         }
 728         if (cid > 0 && cid <= 65535)
 729                 cb->len = snprintf(cb->buf, buflen,
 730                                    cs->dle ? "\020(AT%d%s\020)" : "AT%d%s",
 731                                    cid, cmd);
 732         else
 733                 cb->len = snprintf(cb->buf, buflen,
 734                                    cs->dle ? "\020(AT%s\020)" : "AT%s",
 735                                    cmd);
 736         cb->offset = 0;
 737         cb->next = NULL;
 738         cb->wake_tasklet = NULL;
 739         cs->ops->write_cmd(cs, cb);
 740 }
 741
 742 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 743 {
 744         struct at_state_t *at_state;
 745         int i;
 746         unsigned long flags;
 747
 748         if (cid == 0)
 749                 return &cs->at_state;
 750
 751         for (i = 0; i < cs->channels; ++i)
 752                 if (cid == cs->bcs[i].at_state.cid)
 753                         return &cs->bcs[i].at_state;
 754
 755         spin_lock_irqsave(&cs->lock, flags);
 756
 757         list_for_each_entry(at_state, &cs->temp_at_states, list)
 758                 if (cid == at_state->cid) {
 759                         spin_unlock_irqrestore(&cs->lock, flags);
 760                         return at_state;
 761                 }
 762
 763         spin_unlock_irqrestore(&cs->lock, flags);
 764
 765         return NULL;
 766 }
 767
 768 static void bchannel_down(struct bc_state *bcs)
 769 {
 770         if (bcs->chstate & CHS_B_UP) {
 771                 bcs->chstate &= ~CHS_B_UP;
 772                 gigaset_isdn_hupB(bcs);
 773         }
 774
 775         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 776                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 777                 gigaset_isdn_hupD(bcs);
 778         }
 779
 780         gigaset_free_channel(bcs);
 781
 782         gigaset_bcs_reinit(bcs);
 783 }
 784
 785 static void bchannel_up(struct bc_state *bcs)
 786 {
 787         if (bcs->chstate & CHS_B_UP) {
 788                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 789                            __func__);
 790                 return;
 791         }
 792
 793         bcs->chstate |= CHS_B_UP;
 794         gigaset_isdn_connB(bcs);
 795 }
 796
 797 static void start_dial(struct at_state_t *at_state, void *data,
 798                        unsigned seq_index)
 799 {
 800         struct bc_state *bcs = at_state->bcs;
 801         struct cardstate *cs = at_state->cs;
 802         char **commands = data;
 803         unsigned long flags;
 804         int i;
 805
 806         bcs->chstate |= CHS_NOTIFY_LL;
 807
 808         spin_lock_irqsave(&cs->lock, flags);
 809         if (at_state->seq_index != seq_index) {
 810                 spin_unlock_irqrestore(&cs->lock, flags);
 811                 goto error;
 812         }
 813         spin_unlock_irqrestore(&cs->lock, flags);
 814
 815         for (i = 0; i < AT_NUM; ++i) {
 816                 kfree(bcs->commands[i]);
 817                 bcs->commands[i] = commands[i];
 818         }
 819
 820         at_state->pending_commands |= PC_CID;
 821         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 822         cs->commands_pending = 1;
 823         return;
 824
 825 error:
 826         for (i = 0; i < AT_NUM; ++i) {
 827                 kfree(commands[i]);
 828                 commands[i] = NULL;
 829         }
 830         at_state->pending_commands |= PC_NOCID;
 831         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 832         cs->commands_pending = 1;
 833         return;
 834 }
 835
 836 static void start_accept(struct at_state_t *at_state)
 837 {
 838         struct cardstate *cs = at_state->cs;
 839         struct bc_state *bcs = at_state->bcs;
 840         int i;
 841
 842         for (i = 0; i < AT_NUM; ++i) {
 843                 kfree(bcs->commands[i]);
 844                 bcs->commands[i] = NULL;
 845         }
 846
 847         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 848         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 849         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 850                 dev_err(at_state->cs->dev, "out of memory\n");
 851                 /* error reset */
 852                 at_state->pending_commands |= PC_HUP;
 853                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 854                 cs->commands_pending = 1;
 855                 return;
 856         }
 857
 858         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 859         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 860
 861         at_state->pending_commands |= PC_ACCEPT;
 862         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 863         cs->commands_pending = 1;
 864 }
 865
 866 static void do_start(struct cardstate *cs)
 867 {
 868         gigaset_free_channels(cs);
 869
 870         if (cs->mstate != MS_LOCKED)
 871                 schedule_init(cs, MS_INIT);
 872
 873         cs->isdn_up = 1;
 874         gigaset_isdn_start(cs);
 875
 876         cs->waiting = 0;
 877         wake_up(&cs->waitqueue);
 878 }
 879
 880 static void finish_shutdown(struct cardstate *cs)
 881 {
 882         if (cs->mstate != MS_LOCKED) {
 883                 cs->mstate = MS_UNINITIALIZED;
 884                 cs->mode = M_UNKNOWN;
 885         }
 886
 887         /* Tell the LL that the device is not available .. */
 888         if (cs->isdn_up) {
 889                 cs->isdn_up = 0;
 890                 gigaset_isdn_stop(cs);
 891         }
 892
 893         /* The rest is done by cleanup_cs() in process context. */
 894
 895         cs->cmd_result = -ENODEV;
 896         cs->waiting = 0;
 897         wake_up(&cs->waitqueue);
 898 }
 899
 900 static void do_shutdown(struct cardstate *cs)
 901 {
 902         gigaset_block_channels(cs);
 903
 904         if (cs->mstate == MS_READY) {
 905                 cs->mstate = MS_SHUTDOWN;
 906                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 907                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 908                 cs->commands_pending = 1;
 909         } else
 910                 finish_shutdown(cs);
 911 }
 912
 913 static void do_stop(struct cardstate *cs)
 914 {
 915         unsigned long flags;
 916
 917         spin_lock_irqsave(&cs->lock, flags);
 918         cs->connected = 0;
 919         spin_unlock_irqrestore(&cs->lock, flags);
 920
 921         do_shutdown(cs);
 922 }
 923
 924 /* Entering cid mode or getting a cid failed:
 925  * try to initialize the device and try again.
 926  *
 927  * channel >= 0: getting cid for the channel failed
 928  * channel < 0:  entering cid mode failed
 929  *
 930  * returns 0 on success, <0 on failure
 931  */
 932 static int reinit_and_retry(struct cardstate *cs, int channel)
 933 {
 934         int i;
 935
 936         if (--cs->retry_count <= 0)
 937                 return -EFAULT;
 938
 939         for (i = 0; i < cs->channels; ++i)
 940                 if (cs->bcs[i].at_state.cid > 0)
 941                         return -EBUSY;
 942
 943         if (channel < 0)
 944                 dev_warn(cs->dev,
 945                          "Could not enter cid mode. Reinit device and try again.\n");
 946         else {
 947                 dev_warn(cs->dev,
 948                          "Could not get a call id. Reinit device and try again.\n");
 949                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 950         }
 951         schedule_init(cs, MS_INIT);
 952         return 0;
 953 }
 954
 955 static int at_state_invalid(struct cardstate *cs,
 956                             struct at_state_t *test_ptr)
 957 {
 958         unsigned long flags;
 959         unsigned channel;
 960         struct at_state_t *at_state;
 961         int retval = 0;
 962
 963         spin_lock_irqsave(&cs->lock, flags);
 964
 965         if (test_ptr == &cs->at_state)
 966                 goto exit;
 967
 968         list_for_each_entry(at_state, &cs->temp_at_states, list)
 969                 if (at_state == test_ptr)
 970                         goto exit;
 971
 972         for (channel = 0; channel < cs->channels; ++channel)
 973                 if (&cs->bcs[channel].at_state == test_ptr)
 974                         goto exit;
 975
 976         retval = 1;
 977 exit:
 978         spin_unlock_irqrestore(&cs->lock, flags);
 979         return retval;
 980 }
 981
 982 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
 983                          struct at_state_t *at_state)
 984 {
 985         int retval;
 986
 987         retval = gigaset_isdn_icall(at_state);
 988         switch (retval) {
 989         case ICALL_ACCEPT:
 990                 break;
 991         default:
 992                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
 993                 /* --v-- fall through --v-- */
 994         case ICALL_IGNORE:
 995         case ICALL_REJECT:
 996                 /* hang up actively
 997                  * Device doc says that would reject the call.
 998                  * In fact it doesn't.
 999                  */
1000                 at_state->pending_commands |= PC_HUP;
1001                 cs->commands_pending = 1;
1002                 break;
1003         }
1004 }
1005
1006 static int do_lock(struct cardstate *cs)
1007 {
1008         int mode;
1009         int i;
1010
1011         switch (cs->mstate) {
1012         case MS_UNINITIALIZED:
1013         case MS_READY:
1014                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1015                     cs->at_state.pending_commands)
1016                         return -EBUSY;
1017
1018                 for (i = 0; i < cs->channels; ++i)
1019                         if (cs->bcs[i].at_state.pending_commands)
1020                                 return -EBUSY;
1021
1022                 if (gigaset_get_channels(cs) < 0)
1023                         return -EBUSY;
1024
1025                 break;
1026         case MS_LOCKED:
1027                 break;
1028         default:
1029                 return -EBUSY;
1030         }
1031
1032         mode = cs->mode;
1033         cs->mstate = MS_LOCKED;
1034         cs->mode = M_UNKNOWN;
1035
1036         return mode;
1037 }
1038
1039 static int do_unlock(struct cardstate *cs)
1040 {
1041         if (cs->mstate != MS_LOCKED)
1042                 return -EINVAL;
1043
1044         cs->mstate = MS_UNINITIALIZED;
1045         cs->mode = M_UNKNOWN;
1046         gigaset_free_channels(cs);
1047         if (cs->connected)
1048                 schedule_init(cs, MS_INIT);
1049
1050         return 0;
1051 }
1052
1053 static void do_action(int action, struct cardstate *cs,
1054                       struct bc_state *bcs,
1055                       struct at_state_t **p_at_state, char **pp_command,
1056                       int *p_genresp, int *p_resp_code,
1057                       struct event_t *ev)
1058 {
1059         struct at_state_t *at_state = *p_at_state;
1060         struct at_state_t *at_state2;
1061         unsigned long flags;
1062
1063         int channel;
1064
1065         unsigned char *s, *e;
1066         int i;
1067         unsigned long val;
1068
1069         switch (action) {
1070         case ACT_NOTHING:
1071                 break;
1072         case ACT_TIMEOUT:
1073                 at_state->waiting = 1;
1074                 break;
1075         case ACT_INIT:
1076                 cs->at_state.pending_commands &= ~PC_INIT;
1077                 cs->cur_at_seq = SEQ_NONE;
1078                 cs->mode = M_UNIMODEM;
1079                 spin_lock_irqsave(&cs->lock, flags);
1080                 if (!cs->cidmode) {
1081                         spin_unlock_irqrestore(&cs->lock, flags);
1082                         gigaset_free_channels(cs);
1083                         cs->mstate = MS_READY;
1084                         break;
1085                 }
1086                 spin_unlock_irqrestore(&cs->lock, flags);
1087                 cs->at_state.pending_commands |= PC_CIDMODE;
1088                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1089                 cs->commands_pending = 1;
1090                 break;
1091         case ACT_FAILINIT:
1092                 dev_warn(cs->dev, "Could not initialize the device.\n");
1093                 cs->dle = 0;
1094                 init_failed(cs, M_UNKNOWN);
1095                 cs->cur_at_seq = SEQ_NONE;
1096                 break;
1097         case ACT_CONFIGMODE:
1098                 init_failed(cs, M_CONFIG);
1099                 cs->cur_at_seq = SEQ_NONE;
1100                 break;
1101         case ACT_SETDLE1:
1102                 cs->dle = 1;
1103                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1104                 cs->inbuf[0].inputstate &=
1105                         ~(INS_command | INS_DLE_command);
1106                 break;
1107         case ACT_SETDLE0:
1108                 cs->dle = 0;
1109                 cs->inbuf[0].inputstate =
1110                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1111                         | INS_command;
1112                 break;
1113         case ACT_CMODESET:
1114                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1115                         gigaset_free_channels(cs);
1116                         cs->mstate = MS_READY;
1117                 }
1118                 cs->mode = M_CID;
1119                 cs->cur_at_seq = SEQ_NONE;
1120                 break;
1121         case ACT_UMODESET:
1122                 cs->mode = M_UNIMODEM;
1123                 cs->cur_at_seq = SEQ_NONE;
1124                 break;
1125         case ACT_FAILCMODE:
1126                 cs->cur_at_seq = SEQ_NONE;
1127                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1128                         init_failed(cs, M_UNKNOWN);
1129                         break;
1130                 }
1131                 if (reinit_and_retry(cs, -1) < 0)
1132                         schedule_init(cs, MS_RECOVER);
1133                 break;
1134         case ACT_FAILUMODE:
1135                 cs->cur_at_seq = SEQ_NONE;
1136                 schedule_init(cs, MS_RECOVER);
1137                 break;
1138         case ACT_HUPMODEM:
1139                 /* send "+++" (hangup in unimodem mode) */
1140                 if (cs->connected) {
1141                         struct cmdbuf_t *cb;
1142
1143                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1144                         if (!cb) {
1145                                 dev_err(cs->dev, "%s: out of memory\n",
1146                                         __func__);
1147                                 return;
1148                         }
1149                         memcpy(cb->buf, "+++", 3);
1150                         cb->len = 3;
1151                         cb->offset = 0;
1152                         cb->next = NULL;
1153                         cb->wake_tasklet = NULL;
1154                         cs->ops->write_cmd(cs, cb);
1155                 }
1156                 break;
1157         case ACT_RING:
1158                 /* get fresh AT state structure for new CID */
1159                 at_state2 = get_free_channel(cs, ev->parameter);
1160                 if (!at_state2) {
1161                         dev_warn(cs->dev,
1162                                  "RING ignored: could not allocate channel structure\n");
1163                         break;
1164                 }
1165
1166                 /* initialize AT state structure
1167                  * note that bcs may be NULL if no B channel is free
1168                  */
1169                 at_state2->ConState = 700;
1170                 for (i = 0; i < STR_NUM; ++i) {
1171                         kfree(at_state2->str_var[i]);
1172                         at_state2->str_var[i] = NULL;
1173                 }
1174                 at_state2->int_var[VAR_ZCTP] = -1;
1175
1176                 spin_lock_irqsave(&cs->lock, flags);
1177                 at_state2->timer_expires = RING_TIMEOUT;
1178                 at_state2->timer_active = 1;
1179                 spin_unlock_irqrestore(&cs->lock, flags);
1180                 break;
1181         case ACT_ICALL:
1182                 handle_icall(cs, bcs, at_state);
1183                 break;
1184         case ACT_FAILSDOWN:
1185                 dev_warn(cs->dev, "Could not shut down the device.\n");
1186                 /* fall through */
1187         case ACT_FAKESDOWN:
1188         case ACT_SDOWN:
1189                 cs->cur_at_seq = SEQ_NONE;
1190                 finish_shutdown(cs);
1191                 break;
1192         case ACT_CONNECT:
1193                 if (cs->onechannel) {
1194                         at_state->pending_commands |= PC_DLE1;
1195                         cs->commands_pending = 1;
1196                         break;
1197                 }
1198                 bcs->chstate |= CHS_D_UP;
1199                 gigaset_isdn_connD(bcs);
1200                 cs->ops->init_bchannel(bcs);
1201                 break;
1202         case ACT_DLE1:
1203                 cs->cur_at_seq = SEQ_NONE;
1204                 bcs = cs->bcs + cs->curchannel;
1205
1206                 bcs->chstate |= CHS_D_UP;
1207                 gigaset_isdn_connD(bcs);
1208                 cs->ops->init_bchannel(bcs);
1209                 break;
1210         case ACT_FAKEHUP:
1211                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1212                 /* fall through */
1213         case ACT_DISCONNECT:
1214                 cs->cur_at_seq = SEQ_NONE;
1215                 at_state->cid = -1;
1216                 if (bcs && cs->onechannel && cs->dle) {
1217                         /* Check for other open channels not needed:
1218                          * DLE only used for M10x with one B channel.
1219                          */
1220                         at_state->pending_commands |= PC_DLE0;
1221                         cs->commands_pending = 1;
1222                 } else
1223                         disconnect(p_at_state);
1224                 break;
1225         case ACT_FAKEDLE0:
1226                 at_state->int_var[VAR_ZDLE] = 0;
1227                 cs->dle = 0;
1228                 /* fall through */
1229         case ACT_DLE0:
1230                 cs->cur_at_seq = SEQ_NONE;
1231                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1232                 disconnect(&at_state2);
1233                 break;
1234         case ACT_ABORTHUP:
1235                 cs->cur_at_seq = SEQ_NONE;
1236                 dev_warn(cs->dev, "Could not hang up.\n");
1237                 at_state->cid = -1;
1238                 if (bcs && cs->onechannel)
1239                         at_state->pending_commands |= PC_DLE0;
1240                 else
1241                         disconnect(p_at_state);
1242                 schedule_init(cs, MS_RECOVER);
1243                 break;
1244         case ACT_FAILDLE0:
1245                 cs->cur_at_seq = SEQ_NONE;
1246                 dev_warn(cs->dev, "Could not leave DLE mode.\n");
1247                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1248                 disconnect(&at_state2);
1249                 schedule_init(cs, MS_RECOVER);
1250                 break;
1251         case ACT_FAILDLE1:
1252                 cs->cur_at_seq = SEQ_NONE;
1253                 dev_warn(cs->dev,
1254                          "Could not enter DLE mode. Trying to hang up.\n");
1255                 channel = cs->curchannel;
1256                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1257                 cs->commands_pending = 1;
1258                 break;
1259
1260         case ACT_CID: /* got cid; start dialing */
1261                 cs->cur_at_seq = SEQ_NONE;
1262                 channel = cs->curchannel;
1263                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1264                         cs->bcs[channel].at_state.cid = ev->parameter;
1265                         cs->bcs[channel].at_state.pending_commands |=
1266                                 PC_DIAL;
1267                         cs->commands_pending = 1;
1268                         break;
1269                 }
1270                 /* bad cid: fall through */
1271         case ACT_FAILCID:
1272                 cs->cur_at_seq = SEQ_NONE;
1273                 channel = cs->curchannel;
1274                 if (reinit_and_retry(cs, channel) < 0) {
1275                         dev_warn(cs->dev,
1276                                  "Could not get a call ID. Cannot dial.\n");
1277                         at_state2 = &cs->bcs[channel].at_state;
1278                         disconnect(&at_state2);
1279                 }
1280                 break;
1281         case ACT_ABORTCID:
1282                 cs->cur_at_seq = SEQ_NONE;
1283                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1284                 disconnect(&at_state2);
1285                 break;
1286
1287         case ACT_DIALING:
1288         case ACT_ACCEPTED:
1289                 cs->cur_at_seq = SEQ_NONE;
1290                 break;
1291
1292         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1293                 disconnect(p_at_state);
1294                 break;
1295
1296         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1297                 cs->cur_at_seq = SEQ_NONE;
1298                 at_state->pending_commands |= PC_HUP;
1299                 cs->commands_pending = 1;
1300                 break;
1301
1302         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1303         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1304         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1305                 at_state->pending_commands |= PC_HUP;
1306                 cs->commands_pending = 1;
1307                 break;
1308         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1309                                are not handled properly anymore */
1310                 at_state->getstring = 1;
1311                 break;
1312         case ACT_SETVER:
1313                 if (!ev->ptr) {
1314                         *p_genresp = 1;
1315                         *p_resp_code = RSP_ERROR;
1316                         break;
1317                 }
1318                 s = ev->ptr;
1319
1320                 if (!strcmp(s, "OK")) {
1321                         /* OK without version string: assume old response */
1322                         *p_genresp = 1;
1323                         *p_resp_code = RSP_NONE;
1324                         break;
1325                 }
1326
1327                 for (i = 0; i < 4; ++i) {
1328                         val = simple_strtoul(s, (char **) &e, 10);
1329                         if (val > INT_MAX || e == s)
1330                                 break;
1331                         if (i == 3) {
1332                                 if (*e)
1333                                         break;
1334                         } else if (*e != '.')
1335                                 break;
1336                         else
1337                                 s = e + 1;
1338                         cs->fwver[i] = val;
1339                 }
1340                 if (i != 4) {
1341                         *p_genresp = 1;
1342                         *p_resp_code = RSP_ERROR;
1343                         break;
1344                 }
1345                 cs->gotfwver = 0;
1346                 break;
1347         case ACT_GOTVER:
1348                 if (cs->gotfwver == 0) {
1349                         cs->gotfwver = 1;
1350                         gig_dbg(DEBUG_EVENT,
1351                                 "firmware version %02d.%03d.%02d.%02d",
1352                                 cs->fwver[0], cs->fwver[1],
1353                                 cs->fwver[2], cs->fwver[3]);
1354                         break;
1355                 }
1356                 /* fall through */
1357         case ACT_FAILVER:
1358                 cs->gotfwver = -1;
1359                 dev_err(cs->dev, "could not read firmware version.\n");
1360                 break;
1361         case ACT_ERROR:
1362                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1363                         __func__, at_state->ConState);
1364                 cs->cur_at_seq = SEQ_NONE;
1365                 break;
1366         case ACT_DEBUG:
1367                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1368                         __func__, ev->type, at_state->ConState);
1369                 break;
1370         case ACT_WARN:
1371                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1372                          __func__, ev->type, at_state->ConState);
1373                 break;
1374         case ACT_ZCAU:
1375                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1376                          ev->parameter, at_state->ConState);
1377                 break;
1378
1379         /* events from the LL */
1380
1381         case ACT_DIAL:
1382                 start_dial(at_state, ev->ptr, ev->parameter);
1383                 break;
1384         case ACT_ACCEPT:
1385                 start_accept(at_state);
1386                 break;
1387         case ACT_HUP:
1388                 at_state->pending_commands |= PC_HUP;
1389                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1390                 cs->commands_pending = 1;
1391                 break;
1392
1393         /* hotplug events */
1394
1395         case ACT_STOP:
1396                 do_stop(cs);
1397                 break;
1398         case ACT_START:
1399                 do_start(cs);
1400                 break;
1401
1402         /* events from the interface */
1403
1404         case ACT_IF_LOCK:
1405                 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1406                 cs->waiting = 0;
1407                 wake_up(&cs->waitqueue);
1408                 break;
1409         case ACT_IF_VER:
1410                 if (ev->parameter != 0)
1411                         cs->cmd_result = -EINVAL;
1412                 else if (cs->gotfwver != 1) {
1413                         cs->cmd_result = -ENOENT;
1414                 } else {
1415                         memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1416                         cs->cmd_result = 0;
1417                 }
1418                 cs->waiting = 0;
1419                 wake_up(&cs->waitqueue);
1420                 break;
1421
1422         /* events from the proc file system */
1423
1424         case ACT_PROC_CIDMODE:
1425                 spin_lock_irqsave(&cs->lock, flags);
1426                 if (ev->parameter != cs->cidmode) {
1427                         cs->cidmode = ev->parameter;
1428                         if (ev->parameter) {
1429                                 cs->at_state.pending_commands |= PC_CIDMODE;
1430                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1431                         } else {
1432                                 cs->at_state.pending_commands |= PC_UMMODE;
1433                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1434                         }
1435                         cs->commands_pending = 1;
1436                 }
1437                 spin_unlock_irqrestore(&cs->lock, flags);
1438                 cs->waiting = 0;
1439                 wake_up(&cs->waitqueue);
1440                 break;
1441
1442         /* events from the hardware drivers */
1443
1444         case ACT_NOTIFY_BC_DOWN:
1445                 bchannel_down(bcs);
1446                 break;
1447         case ACT_NOTIFY_BC_UP:
1448                 bchannel_up(bcs);
1449                 break;
1450         case ACT_SHUTDOWN:
1451                 do_shutdown(cs);
1452                 break;
1453
1454
1455         default:
1456                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1457                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1458                         if (!*pp_command) {
1459                                 *p_genresp = 1;
1460                                 *p_resp_code = RSP_NULL;
1461                         }
1462                 } else
1463                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1464         }
1465 }
1466
1467 /* State machine to do the calling and hangup procedure */
1468 static void process_event(struct cardstate *cs, struct event_t *ev)
1469 {
1470         struct bc_state *bcs;
1471         char *p_command = NULL;
1472         struct reply_t *rep;
1473         int rcode;
1474         int genresp = 0;
1475         int resp_code = RSP_ERROR;
1476         struct at_state_t *at_state;
1477         int index;
1478         int curact;
1479         unsigned long flags;
1480
1481         if (ev->cid >= 0) {
1482                 at_state = at_state_from_cid(cs, ev->cid);
1483                 if (!at_state) {
1484                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1485                                 ev->type, ev->cid);
1486                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1487                                           NULL, 0, NULL);
1488                         return;
1489                 }
1490         } else {
1491                 at_state = ev->at_state;
1492                 if (at_state_invalid(cs, at_state)) {
1493                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1494                                 at_state);
1495                         return;
1496                 }
1497         }
1498
1499         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1500                 at_state->ConState, ev->type);
1501
1502         bcs = at_state->bcs;
1503
1504         /* Setting the pointer to the dial array */
1505         rep = at_state->replystruct;
1506
1507         spin_lock_irqsave(&cs->lock, flags);
1508         if (ev->type == EV_TIMEOUT) {
1509                 if (ev->parameter != at_state->timer_index
1510                     || !at_state->timer_active) {
1511                         ev->type = RSP_NONE; /* old timeout */
1512                         gig_dbg(DEBUG_EVENT, "old timeout");
1513                 } else {
1514                         if (at_state->waiting)
1515                                 gig_dbg(DEBUG_EVENT, "stopped waiting");
1516                         else
1517                                 gig_dbg(DEBUG_EVENT, "timeout occurred");
1518                 }
1519         }
1520         spin_unlock_irqrestore(&cs->lock, flags);
1521
1522         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1523            or at_state->str_var[STR_XXXX], set it */
1524         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1525                 index = ev->type - RSP_VAR;
1526                 at_state->int_var[index] = ev->parameter;
1527         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1528                 index = ev->type - RSP_STR;
1529                 kfree(at_state->str_var[index]);
1530                 at_state->str_var[index] = ev->ptr;
1531                 ev->ptr = NULL; /* prevent process_events() from
1532                                    deallocating ptr */
1533         }
1534
1535         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1536                 at_state->getstring = 0;
1537
1538         /* Search row in dial array which matches modem response and current
1539            constate */
1540         for (;; rep++) {
1541                 rcode = rep->resp_code;
1542                 if (rcode == RSP_LAST) {
1543                         /* found nothing...*/
1544                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1545                                  "resp_code %d in ConState %d!\n",
1546                                  __func__, ev->type, at_state->ConState);
1547                         return;
1548                 }
1549                 if ((rcode == RSP_ANY || rcode == ev->type)
1550                     && ((int) at_state->ConState >= rep->min_ConState)
1551                     && (rep->max_ConState < 0
1552                         || (int) at_state->ConState <= rep->max_ConState)
1553                     && (rep->parameter < 0 || rep->parameter == ev->parameter))
1554                         break;
1555         }
1556
1557         p_command = rep->command;
1558
1559         at_state->waiting = 0;
1560         for (curact = 0; curact < MAXACT; ++curact) {
1561                 /* The row tells us what we should do  ..
1562                  */
1563                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1564                           &genresp, &resp_code, ev);
1565                 if (!at_state)
1566                         /* at_state destroyed by disconnect */
1567                         return;
1568         }
1569
1570         /* Jump to the next con-state regarding the array */
1571         if (rep->new_ConState >= 0)
1572                 at_state->ConState = rep->new_ConState;
1573
1574         if (genresp) {
1575                 spin_lock_irqsave(&cs->lock, flags);
1576                 at_state->timer_expires = 0;
1577                 at_state->timer_active = 0;
1578                 spin_unlock_irqrestore(&cs->lock, flags);
1579                 gigaset_add_event(cs, at_state, resp_code, NULL, 0, NULL);
1580         } else {
1581                 /* Send command to modem if not NULL... */
1582                 if (p_command) {
1583                         if (cs->connected)
1584                                 send_command(cs, p_command, at_state);
1585                         else
1586                                 gigaset_add_event(cs, at_state, RSP_NODEV,
1587                                                   NULL, 0, NULL);
1588                 }
1589
1590                 spin_lock_irqsave(&cs->lock, flags);
1591                 if (!rep->timeout) {
1592                         at_state->timer_expires = 0;
1593                         at_state->timer_active = 0;
1594                 } else if (rep->timeout > 0) { /* new timeout */
1595                         at_state->timer_expires = rep->timeout * 10;
1596                         at_state->timer_active = 1;
1597                         ++at_state->timer_index;
1598                 }
1599                 spin_unlock_irqrestore(&cs->lock, flags);
1600         }
1601 }
1602
1603 static void schedule_sequence(struct cardstate *cs,
1604                               struct at_state_t *at_state, int sequence)
1605 {
1606         cs->cur_at_seq = sequence;
1607         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1608 }
1609
1610 static void process_command_flags(struct cardstate *cs)
1611 {
1612         struct at_state_t *at_state = NULL;
1613         struct bc_state *bcs;
1614         int i;
1615         int sequence;
1616         unsigned long flags;
1617
1618         cs->commands_pending = 0;
1619
1620         if (cs->cur_at_seq) {
1621                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1622                 return;
1623         }
1624
1625         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1626
1627         sequence = SEQ_NONE;
1628
1629         /* clear pending_commands and hangup channels on shutdown */
1630         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1631                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1632                 for (i = 0; i < cs->channels; ++i) {
1633                         bcs = cs->bcs + i;
1634                         at_state = &bcs->at_state;
1635                         at_state->pending_commands &=
1636                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1637                         if (at_state->cid > 0)
1638                                 at_state->pending_commands |= PC_HUP;
1639                         if (at_state->pending_commands & PC_CID) {
1640                                 at_state->pending_commands |= PC_NOCID;
1641                                 at_state->pending_commands &= ~PC_CID;
1642                         }
1643                 }
1644         }
1645
1646         /* clear pending_commands and hangup channels on reset */
1647         if (cs->at_state.pending_commands & PC_INIT) {
1648                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1649                 for (i = 0; i < cs->channels; ++i) {
1650                         bcs = cs->bcs + i;
1651                         at_state = &bcs->at_state;
1652                         at_state->pending_commands &=
1653                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1654                         if (at_state->cid > 0)
1655                                 at_state->pending_commands |= PC_HUP;
1656                         if (cs->mstate == MS_RECOVER) {
1657                                 if (at_state->pending_commands & PC_CID) {
1658                                         at_state->pending_commands |= PC_NOCID;
1659                                         at_state->pending_commands &= ~PC_CID;
1660                                 }
1661                         }
1662                 }
1663         }
1664
1665         /* only switch back to unimodem mode if no commands are pending and
1666          * no channels are up */
1667         spin_lock_irqsave(&cs->lock, flags);
1668         if (cs->at_state.pending_commands == PC_UMMODE
1669             && !cs->cidmode
1670             && list_empty(&cs->temp_at_states)
1671             && cs->mode == M_CID) {
1672                 sequence = SEQ_UMMODE;
1673                 at_state = &cs->at_state;
1674                 for (i = 0; i < cs->channels; ++i) {
1675                         bcs = cs->bcs + i;
1676                         if (bcs->at_state.pending_commands ||
1677                             bcs->at_state.cid > 0) {
1678                                 sequence = SEQ_NONE;
1679                                 break;
1680                         }
1681                 }
1682         }
1683         spin_unlock_irqrestore(&cs->lock, flags);
1684         cs->at_state.pending_commands &= ~PC_UMMODE;
1685         if (sequence != SEQ_NONE) {
1686                 schedule_sequence(cs, at_state, sequence);
1687                 return;
1688         }
1689
1690         for (i = 0; i < cs->channels; ++i) {
1691                 bcs = cs->bcs + i;
1692                 if (bcs->at_state.pending_commands & PC_HUP) {
1693                         if (cs->dle) {
1694                                 cs->curchannel = bcs->channel;
1695                                 schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1696                                 return;
1697                         }
1698                         bcs->at_state.pending_commands &= ~PC_HUP;
1699                         if (bcs->at_state.pending_commands & PC_CID) {
1700                                 /* not yet dialing: PC_NOCID is sufficient */
1701                                 bcs->at_state.pending_commands |= PC_NOCID;
1702                                 bcs->at_state.pending_commands &= ~PC_CID;
1703                         } else {
1704                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1705                                 return;
1706                         }
1707                 }
1708                 if (bcs->at_state.pending_commands & PC_NOCID) {
1709                         bcs->at_state.pending_commands &= ~PC_NOCID;
1710                         cs->curchannel = bcs->channel;
1711                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1712                         return;
1713                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1714                         bcs->at_state.pending_commands &= ~PC_DLE0;
1715                         cs->curchannel = bcs->channel;
1716                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1717                         return;
1718                 }
1719         }
1720
1721         list_for_each_entry(at_state, &cs->temp_at_states, list)
1722                 if (at_state->pending_commands & PC_HUP) {
1723                         at_state->pending_commands &= ~PC_HUP;
1724                         schedule_sequence(cs, at_state, SEQ_HUP);
1725                         return;
1726                 }
1727
1728         if (cs->at_state.pending_commands & PC_INIT) {
1729                 cs->at_state.pending_commands &= ~PC_INIT;
1730                 cs->dle = 0;
1731                 cs->inbuf->inputstate = INS_command;
1732                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1733                 return;
1734         }
1735         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1736                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1737                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1738                 return;
1739         }
1740         if (cs->at_state.pending_commands & PC_CIDMODE) {
1741                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1742                 if (cs->mode == M_UNIMODEM) {
1743                         cs->retry_count = 1;
1744                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1745                         return;
1746                 }
1747         }
1748
1749         for (i = 0; i < cs->channels; ++i) {
1750                 bcs = cs->bcs + i;
1751                 if (bcs->at_state.pending_commands & PC_DLE1) {
1752                         bcs->at_state.pending_commands &= ~PC_DLE1;
1753                         cs->curchannel = bcs->channel;
1754                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1755                         return;
1756                 }
1757                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1758                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1759                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1760                         return;
1761                 }
1762                 if (bcs->at_state.pending_commands & PC_DIAL) {
1763                         bcs->at_state.pending_commands &= ~PC_DIAL;
1764                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1765                         return;
1766                 }
1767                 if (bcs->at_state.pending_commands & PC_CID) {
1768                         switch (cs->mode) {
1769                         case M_UNIMODEM:
1770                                 cs->at_state.pending_commands |= PC_CIDMODE;
1771                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1772                                 cs->commands_pending = 1;
1773                                 return;
1774                         case M_UNKNOWN:
1775                                 schedule_init(cs, MS_INIT);
1776                                 return;
1777                         }
1778                         bcs->at_state.pending_commands &= ~PC_CID;
1779                         cs->curchannel = bcs->channel;
1780                         cs->retry_count = 2;
1781                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1782                         return;
1783                 }
1784         }
1785 }
1786
1787 static void process_events(struct cardstate *cs)
1788 {
1789         struct event_t *ev;
1790         unsigned head, tail;
1791         int i;
1792         int check_flags = 0;
1793         int was_busy;
1794         unsigned long flags;
1795
1796         spin_lock_irqsave(&cs->ev_lock, flags);
1797         head = cs->ev_head;
1798
1799         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1800                 tail = cs->ev_tail;
1801                 if (tail == head) {
1802                         if (!check_flags && !cs->commands_pending)
1803                                 break;
1804                         check_flags = 0;
1805                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1806                         process_command_flags(cs);
1807                         spin_lock_irqsave(&cs->ev_lock, flags);
1808                         tail = cs->ev_tail;
1809                         if (tail == head) {
1810                                 if (!cs->commands_pending)
1811                                         break;
1812                                 continue;
1813                         }
1814                 }
1815
1816                 ev = cs->events + head;
1817                 was_busy = cs->cur_at_seq != SEQ_NONE;
1818                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1819                 process_event(cs, ev);
1820                 spin_lock_irqsave(&cs->ev_lock, flags);
1821                 kfree(ev->ptr);
1822                 ev->ptr = NULL;
1823                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1824                         check_flags = 1;
1825
1826                 head = (head + 1) % MAX_EVENTS;
1827                 cs->ev_head = head;
1828         }
1829
1830         spin_unlock_irqrestore(&cs->ev_lock, flags);
1831
1832         if (i == 2 * MAX_EVENTS) {
1833                 dev_err(cs->dev,
1834                         "infinite loop in process_events; aborting.\n");
1835         }
1836 }
1837
1838 /* tasklet scheduled on any event received from the Gigaset device
1839  * parameter:
1840  *      data    ISDN controller state structure
1841  */
1842 void gigaset_handle_event(unsigned long data)
1843 {
1844         struct cardstate *cs = (struct cardstate *) data;
1845
1846         /* handle incoming data on control/common channel */
1847         if (cs->inbuf->head != cs->inbuf->tail) {
1848                 gig_dbg(DEBUG_INTR, "processing new data");
1849                 cs->ops->handle_input(cs->inbuf);
1850         }
1851
1852         process_events(cs);
1853 }