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_nobc
 608  * process closing of connection associated with given AT state structure
 609  * without B channel
 610  */
 611 static void disconnect_nobc(struct at_state_t **at_state_p,
 612                             struct cardstate *cs)
 613 {
 614         unsigned long flags;
 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
 626         /* check for and deallocate temporary AT state */
 627         if (!list_empty(&(*at_state_p)->list)) {
 628                 list_del(&(*at_state_p)->list);
 629                 kfree(*at_state_p);
 630                 *at_state_p = NULL;
 631         }
 632
 633         spin_unlock_irqrestore(&cs->lock, flags);
 634 }
 635
 636 /* disconnect_bc
 637  * process closing of connection associated with given AT state structure
 638  * and B channel
 639  */
 640 static void disconnect_bc(struct at_state_t *at_state,
 641                           struct cardstate *cs, struct bc_state *bcs)
 642 {
 643         unsigned long flags;
 644
 645         spin_lock_irqsave(&cs->lock, flags);
 646         ++at_state->seq_index;
 647
 648         /* revert to selected idle mode */
 649         if (!cs->cidmode) {
 650                 cs->at_state.pending_commands |= PC_UMMODE;
 651                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 652                 cs->commands_pending = 1;
 653         }
 654         spin_unlock_irqrestore(&cs->lock, flags);
 655
 656         /* invoke hardware specific handler */
 657         cs->ops->close_bchannel(bcs);
 658
 659         /* notify LL */
 660         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 661                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 662                 gigaset_isdn_hupD(bcs);
 663         }
 664 }
 665
 666 /* get_free_channel
 667  * get a free AT state structure: either one of those associated with the
 668  * B channels of the Gigaset device, or if none of those is available,
 669  * a newly allocated one with bcs=NULL
 670  * The structure should be freed by calling disconnect_nobc() after use.
 671  */
 672 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 673                                                   int cid)
 674 /* cids: >0: siemens-cid
 675  *        0: without cid
 676  *       -1: no cid assigned yet
 677  */
 678 {
 679         unsigned long flags;
 680         int i;
 681         struct at_state_t *ret;
 682
 683         for (i = 0; i < cs->channels; ++i)
 684                 if (gigaset_get_channel(cs->bcs + i) >= 0) {
 685                         ret = &cs->bcs[i].at_state;
 686                         ret->cid = cid;
 687                         return ret;
 688                 }
 689
 690         spin_lock_irqsave(&cs->lock, flags);
 691         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 692         if (ret) {
 693                 gigaset_at_init(ret, NULL, cs, cid);
 694                 list_add(&ret->list, &cs->temp_at_states);
 695         }
 696         spin_unlock_irqrestore(&cs->lock, flags);
 697         return ret;
 698 }
 699
 700 static void init_failed(struct cardstate *cs, int mode)
 701 {
 702         int i;
 703         struct at_state_t *at_state;
 704
 705         cs->at_state.pending_commands &= ~PC_INIT;
 706         cs->mode = mode;
 707         cs->mstate = MS_UNINITIALIZED;
 708         gigaset_free_channels(cs);
 709         for (i = 0; i < cs->channels; ++i) {
 710                 at_state = &cs->bcs[i].at_state;
 711                 if (at_state->pending_commands & PC_CID) {
 712                         at_state->pending_commands &= ~PC_CID;
 713                         at_state->pending_commands |= PC_NOCID;
 714                         cs->commands_pending = 1;
 715                 }
 716         }
 717 }
 718
 719 static void schedule_init(struct cardstate *cs, int state)
 720 {
 721         if (cs->at_state.pending_commands & PC_INIT) {
 722                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 723                 return;
 724         }
 725         cs->mstate = state;
 726         cs->mode = M_UNKNOWN;
 727         gigaset_block_channels(cs);
 728         cs->at_state.pending_commands |= PC_INIT;
 729         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 730         cs->commands_pending = 1;
 731 }
 732
 733 /* send an AT command
 734  * adding the "AT" prefix, cid and DLE encapsulation as appropriate
 735  */
 736 static void send_command(struct cardstate *cs, const char *cmd,
 737                          struct at_state_t *at_state)
 738 {
 739         int cid = at_state->cid;
 740         struct cmdbuf_t *cb;
 741         size_t buflen;
 742
 743         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 744         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, GFP_ATOMIC);
 745         if (!cb) {
 746                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 747                 return;
 748         }
 749         if (cid > 0 && cid <= 65535)
 750                 cb->len = snprintf(cb->buf, buflen,
 751                                    cs->dle ? "\020(AT%d%s\020)" : "AT%d%s",
 752                                    cid, cmd);
 753         else
 754                 cb->len = snprintf(cb->buf, buflen,
 755                                    cs->dle ? "\020(AT%s\020)" : "AT%s",
 756                                    cmd);
 757         cb->offset = 0;
 758         cb->next = NULL;
 759         cb->wake_tasklet = NULL;
 760         cs->ops->write_cmd(cs, cb);
 761 }
 762
 763 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 764 {
 765         struct at_state_t *at_state;
 766         int i;
 767         unsigned long flags;
 768
 769         if (cid == 0)
 770                 return &cs->at_state;
 771
 772         for (i = 0; i < cs->channels; ++i)
 773                 if (cid == cs->bcs[i].at_state.cid)
 774                         return &cs->bcs[i].at_state;
 775
 776         spin_lock_irqsave(&cs->lock, flags);
 777
 778         list_for_each_entry(at_state, &cs->temp_at_states, list)
 779                 if (cid == at_state->cid) {
 780                         spin_unlock_irqrestore(&cs->lock, flags);
 781                         return at_state;
 782                 }
 783
 784         spin_unlock_irqrestore(&cs->lock, flags);
 785
 786         return NULL;
 787 }
 788
 789 static void bchannel_down(struct bc_state *bcs)
 790 {
 791         if (bcs->chstate & CHS_B_UP) {
 792                 bcs->chstate &= ~CHS_B_UP;
 793                 gigaset_isdn_hupB(bcs);
 794         }
 795
 796         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 797                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 798                 gigaset_isdn_hupD(bcs);
 799         }
 800
 801         gigaset_free_channel(bcs);
 802
 803         gigaset_bcs_reinit(bcs);
 804 }
 805
 806 static void bchannel_up(struct bc_state *bcs)
 807 {
 808         if (bcs->chstate & CHS_B_UP) {
 809                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 810                            __func__);
 811                 return;
 812         }
 813
 814         bcs->chstate |= CHS_B_UP;
 815         gigaset_isdn_connB(bcs);
 816 }
 817
 818 static void start_dial(struct at_state_t *at_state, void *data,
 819                        unsigned seq_index)
 820 {
 821         struct bc_state *bcs = at_state->bcs;
 822         struct cardstate *cs = at_state->cs;
 823         char **commands = data;
 824         unsigned long flags;
 825         int i;
 826
 827         bcs->chstate |= CHS_NOTIFY_LL;
 828
 829         spin_lock_irqsave(&cs->lock, flags);
 830         if (at_state->seq_index != seq_index) {
 831                 spin_unlock_irqrestore(&cs->lock, flags);
 832                 goto error;
 833         }
 834         spin_unlock_irqrestore(&cs->lock, flags);
 835
 836         for (i = 0; i < AT_NUM; ++i) {
 837                 kfree(bcs->commands[i]);
 838                 bcs->commands[i] = commands[i];
 839         }
 840
 841         at_state->pending_commands |= PC_CID;
 842         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 843         cs->commands_pending = 1;
 844         return;
 845
 846 error:
 847         for (i = 0; i < AT_NUM; ++i) {
 848                 kfree(commands[i]);
 849                 commands[i] = NULL;
 850         }
 851         at_state->pending_commands |= PC_NOCID;
 852         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 853         cs->commands_pending = 1;
 854         return;
 855 }
 856
 857 static void start_accept(struct at_state_t *at_state)
 858 {
 859         struct cardstate *cs = at_state->cs;
 860         struct bc_state *bcs = at_state->bcs;
 861         int i;
 862
 863         for (i = 0; i < AT_NUM; ++i) {
 864                 kfree(bcs->commands[i]);
 865                 bcs->commands[i] = NULL;
 866         }
 867
 868         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 869         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 870         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 871                 dev_err(at_state->cs->dev, "out of memory\n");
 872                 /* error reset */
 873                 at_state->pending_commands |= PC_HUP;
 874                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 875                 cs->commands_pending = 1;
 876                 return;
 877         }
 878
 879         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 880         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 881
 882         at_state->pending_commands |= PC_ACCEPT;
 883         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 884         cs->commands_pending = 1;
 885 }
 886
 887 static void do_start(struct cardstate *cs)
 888 {
 889         gigaset_free_channels(cs);
 890
 891         if (cs->mstate != MS_LOCKED)
 892                 schedule_init(cs, MS_INIT);
 893
 894         cs->isdn_up = 1;
 895         gigaset_isdn_start(cs);
 896
 897         cs->waiting = 0;
 898         wake_up(&cs->waitqueue);
 899 }
 900
 901 static void finish_shutdown(struct cardstate *cs)
 902 {
 903         if (cs->mstate != MS_LOCKED) {
 904                 cs->mstate = MS_UNINITIALIZED;
 905                 cs->mode = M_UNKNOWN;
 906         }
 907
 908         /* Tell the LL that the device is not available .. */
 909         if (cs->isdn_up) {
 910                 cs->isdn_up = 0;
 911                 gigaset_isdn_stop(cs);
 912         }
 913
 914         /* The rest is done by cleanup_cs() in process context. */
 915
 916         cs->cmd_result = -ENODEV;
 917         cs->waiting = 0;
 918         wake_up(&cs->waitqueue);
 919 }
 920
 921 static void do_shutdown(struct cardstate *cs)
 922 {
 923         gigaset_block_channels(cs);
 924
 925         if (cs->mstate == MS_READY) {
 926                 cs->mstate = MS_SHUTDOWN;
 927                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 928                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 929                 cs->commands_pending = 1;
 930         } else
 931                 finish_shutdown(cs);
 932 }
 933
 934 static void do_stop(struct cardstate *cs)
 935 {
 936         unsigned long flags;
 937
 938         spin_lock_irqsave(&cs->lock, flags);
 939         cs->connected = 0;
 940         spin_unlock_irqrestore(&cs->lock, flags);
 941
 942         do_shutdown(cs);
 943 }
 944
 945 /* Entering cid mode or getting a cid failed:
 946  * try to initialize the device and try again.
 947  *
 948  * channel >= 0: getting cid for the channel failed
 949  * channel < 0:  entering cid mode failed
 950  *
 951  * returns 0 on success, <0 on failure
 952  */
 953 static int reinit_and_retry(struct cardstate *cs, int channel)
 954 {
 955         int i;
 956
 957         if (--cs->retry_count <= 0)
 958                 return -EFAULT;
 959
 960         for (i = 0; i < cs->channels; ++i)
 961                 if (cs->bcs[i].at_state.cid > 0)
 962                         return -EBUSY;
 963
 964         if (channel < 0)
 965                 dev_warn(cs->dev,
 966                          "Could not enter cid mode. Reinit device and try again.\n");
 967         else {
 968                 dev_warn(cs->dev,
 969                          "Could not get a call id. Reinit device and try again.\n");
 970                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 971         }
 972         schedule_init(cs, MS_INIT);
 973         return 0;
 974 }
 975
 976 static int at_state_invalid(struct cardstate *cs,
 977                             struct at_state_t *test_ptr)
 978 {
 979         unsigned long flags;
 980         unsigned channel;
 981         struct at_state_t *at_state;
 982         int retval = 0;
 983
 984         spin_lock_irqsave(&cs->lock, flags);
 985
 986         if (test_ptr == &cs->at_state)
 987                 goto exit;
 988
 989         list_for_each_entry(at_state, &cs->temp_at_states, list)
 990                 if (at_state == test_ptr)
 991                         goto exit;
 992
 993         for (channel = 0; channel < cs->channels; ++channel)
 994                 if (&cs->bcs[channel].at_state == test_ptr)
 995                         goto exit;
 996
 997         retval = 1;
 998 exit:
 999         spin_unlock_irqrestore(&cs->lock, flags);
1000         return retval;
1001 }
1002
1003 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
1004                          struct at_state_t *at_state)
1005 {
1006         int retval;
1007
1008         retval = gigaset_isdn_icall(at_state);
1009         switch (retval) {
1010         case ICALL_ACCEPT:
1011                 break;
1012         default:
1013                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
1014                 /* --v-- fall through --v-- */
1015         case ICALL_IGNORE:
1016         case ICALL_REJECT:
1017                 /* hang up actively
1018                  * Device doc says that would reject the call.
1019                  * In fact it doesn't.
1020                  */
1021                 at_state->pending_commands |= PC_HUP;
1022                 cs->commands_pending = 1;
1023                 break;
1024         }
1025 }
1026
1027 static int do_lock(struct cardstate *cs)
1028 {
1029         int mode;
1030         int i;
1031
1032         switch (cs->mstate) {
1033         case MS_UNINITIALIZED:
1034         case MS_READY:
1035                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1036                     cs->at_state.pending_commands)
1037                         return -EBUSY;
1038
1039                 for (i = 0; i < cs->channels; ++i)
1040                         if (cs->bcs[i].at_state.pending_commands)
1041                                 return -EBUSY;
1042
1043                 if (gigaset_get_channels(cs) < 0)
1044                         return -EBUSY;
1045
1046                 break;
1047         case MS_LOCKED:
1048                 break;
1049         default:
1050                 return -EBUSY;
1051         }
1052
1053         mode = cs->mode;
1054         cs->mstate = MS_LOCKED;
1055         cs->mode = M_UNKNOWN;
1056
1057         return mode;
1058 }
1059
1060 static int do_unlock(struct cardstate *cs)
1061 {
1062         if (cs->mstate != MS_LOCKED)
1063                 return -EINVAL;
1064
1065         cs->mstate = MS_UNINITIALIZED;
1066         cs->mode = M_UNKNOWN;
1067         gigaset_free_channels(cs);
1068         if (cs->connected)
1069                 schedule_init(cs, MS_INIT);
1070
1071         return 0;
1072 }
1073
1074 static void do_action(int action, struct cardstate *cs,
1075                       struct bc_state *bcs,
1076                       struct at_state_t **p_at_state, char **pp_command,
1077                       int *p_genresp, int *p_resp_code,
1078                       struct event_t *ev)
1079 {
1080         struct at_state_t *at_state = *p_at_state;
1081         struct bc_state *bcs2;
1082         unsigned long flags;
1083
1084         int channel;
1085
1086         unsigned char *s, *e;
1087         int i;
1088         unsigned long val;
1089
1090         switch (action) {
1091         case ACT_NOTHING:
1092                 break;
1093         case ACT_TIMEOUT:
1094                 at_state->waiting = 1;
1095                 break;
1096         case ACT_INIT:
1097                 cs->at_state.pending_commands &= ~PC_INIT;
1098                 cs->cur_at_seq = SEQ_NONE;
1099                 cs->mode = M_UNIMODEM;
1100                 spin_lock_irqsave(&cs->lock, flags);
1101                 if (!cs->cidmode) {
1102                         spin_unlock_irqrestore(&cs->lock, flags);
1103                         gigaset_free_channels(cs);
1104                         cs->mstate = MS_READY;
1105                         break;
1106                 }
1107                 spin_unlock_irqrestore(&cs->lock, flags);
1108                 cs->at_state.pending_commands |= PC_CIDMODE;
1109                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1110                 cs->commands_pending = 1;
1111                 break;
1112         case ACT_FAILINIT:
1113                 dev_warn(cs->dev, "Could not initialize the device.\n");
1114                 cs->dle = 0;
1115                 init_failed(cs, M_UNKNOWN);
1116                 cs->cur_at_seq = SEQ_NONE;
1117                 break;
1118         case ACT_CONFIGMODE:
1119                 init_failed(cs, M_CONFIG);
1120                 cs->cur_at_seq = SEQ_NONE;
1121                 break;
1122         case ACT_SETDLE1:
1123                 cs->dle = 1;
1124                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1125                 cs->inbuf[0].inputstate &=
1126                         ~(INS_command | INS_DLE_command);
1127                 break;
1128         case ACT_SETDLE0:
1129                 cs->dle = 0;
1130                 cs->inbuf[0].inputstate =
1131                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1132                         | INS_command;
1133                 break;
1134         case ACT_CMODESET:
1135                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1136                         gigaset_free_channels(cs);
1137                         cs->mstate = MS_READY;
1138                 }
1139                 cs->mode = M_CID;
1140                 cs->cur_at_seq = SEQ_NONE;
1141                 break;
1142         case ACT_UMODESET:
1143                 cs->mode = M_UNIMODEM;
1144                 cs->cur_at_seq = SEQ_NONE;
1145                 break;
1146         case ACT_FAILCMODE:
1147                 cs->cur_at_seq = SEQ_NONE;
1148                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1149                         init_failed(cs, M_UNKNOWN);
1150                         break;
1151                 }
1152                 if (reinit_and_retry(cs, -1) < 0)
1153                         schedule_init(cs, MS_RECOVER);
1154                 break;
1155         case ACT_FAILUMODE:
1156                 cs->cur_at_seq = SEQ_NONE;
1157                 schedule_init(cs, MS_RECOVER);
1158                 break;
1159         case ACT_HUPMODEM:
1160                 /* send "+++" (hangup in unimodem mode) */
1161                 if (cs->connected) {
1162                         struct cmdbuf_t *cb;
1163
1164                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1165                         if (!cb) {
1166                                 dev_err(cs->dev, "%s: out of memory\n",
1167                                         __func__);
1168                                 return;
1169                         }
1170                         memcpy(cb->buf, "+++", 3);
1171                         cb->len = 3;
1172                         cb->offset = 0;
1173                         cb->next = NULL;
1174                         cb->wake_tasklet = NULL;
1175                         cs->ops->write_cmd(cs, cb);
1176                 }
1177                 break;
1178         case ACT_RING:
1179                 /* get fresh AT state structure for new CID */
1180                 at_state = get_free_channel(cs, ev->parameter);
1181                 if (!at_state) {
1182                         dev_warn(cs->dev,
1183                                  "RING ignored: could not allocate channel structure\n");
1184                         break;
1185                 }
1186
1187                 /* initialize AT state structure
1188                  * note that bcs may be NULL if no B channel is free
1189                  */
1190                 at_state->ConState = 700;
1191                 for (i = 0; i < STR_NUM; ++i) {
1192                         kfree(at_state->str_var[i]);
1193                         at_state->str_var[i] = NULL;
1194                 }
1195                 at_state->int_var[VAR_ZCTP] = -1;
1196
1197                 spin_lock_irqsave(&cs->lock, flags);
1198                 at_state->timer_expires = RING_TIMEOUT;
1199                 at_state->timer_active = 1;
1200                 spin_unlock_irqrestore(&cs->lock, flags);
1201                 break;
1202         case ACT_ICALL:
1203                 handle_icall(cs, bcs, at_state);
1204                 break;
1205         case ACT_FAILSDOWN:
1206                 dev_warn(cs->dev, "Could not shut down the device.\n");
1207                 /* fall through */
1208         case ACT_FAKESDOWN:
1209         case ACT_SDOWN:
1210                 cs->cur_at_seq = SEQ_NONE;
1211                 finish_shutdown(cs);
1212                 break;
1213         case ACT_CONNECT:
1214                 if (cs->onechannel) {
1215                         at_state->pending_commands |= PC_DLE1;
1216                         cs->commands_pending = 1;
1217                         break;
1218                 }
1219                 bcs->chstate |= CHS_D_UP;
1220                 gigaset_isdn_connD(bcs);
1221                 cs->ops->init_bchannel(bcs);
1222                 break;
1223         case ACT_DLE1:
1224                 cs->cur_at_seq = SEQ_NONE;
1225                 bcs = cs->bcs + cs->curchannel;
1226
1227                 bcs->chstate |= CHS_D_UP;
1228                 gigaset_isdn_connD(bcs);
1229                 cs->ops->init_bchannel(bcs);
1230                 break;
1231         case ACT_FAKEHUP:
1232                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1233                 /* fall through */
1234         case ACT_DISCONNECT:
1235                 cs->cur_at_seq = SEQ_NONE;
1236                 at_state->cid = -1;
1237                 if (!bcs) {
1238                         disconnect_nobc(p_at_state, cs);
1239                 } else if (cs->onechannel && cs->dle) {
1240                         /* Check for other open channels not needed:
1241                          * DLE only used for M10x with one B channel.
1242                          */
1243                         at_state->pending_commands |= PC_DLE0;
1244                         cs->commands_pending = 1;
1245                 } else {
1246                         disconnect_bc(at_state, cs, bcs);
1247                 }
1248                 break;
1249         case ACT_FAKEDLE0:
1250                 at_state->int_var[VAR_ZDLE] = 0;
1251                 cs->dle = 0;
1252                 /* fall through */
1253         case ACT_DLE0:
1254                 cs->cur_at_seq = SEQ_NONE;
1255                 bcs2 = cs->bcs + cs->curchannel;
1256                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1257                 break;
1258         case ACT_ABORTHUP:
1259                 cs->cur_at_seq = SEQ_NONE;
1260                 dev_warn(cs->dev, "Could not hang up.\n");
1261                 at_state->cid = -1;
1262                 if (!bcs)
1263                         disconnect_nobc(p_at_state, cs);
1264                 else if (cs->onechannel)
1265                         at_state->pending_commands |= PC_DLE0;
1266                 else
1267                         disconnect_bc(at_state, cs, bcs);
1268                 schedule_init(cs, MS_RECOVER);
1269                 break;
1270         case ACT_FAILDLE0:
1271                 cs->cur_at_seq = SEQ_NONE;
1272                 dev_warn(cs->dev, "Error leaving DLE mode.\n");
1273                 cs->dle = 0;
1274                 bcs2 = cs->bcs + cs->curchannel;
1275                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1276                 schedule_init(cs, MS_RECOVER);
1277                 break;
1278         case ACT_FAILDLE1:
1279                 cs->cur_at_seq = SEQ_NONE;
1280                 dev_warn(cs->dev,
1281                          "Could not enter DLE mode. Trying to hang up.\n");
1282                 channel = cs->curchannel;
1283                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1284                 cs->commands_pending = 1;
1285                 break;
1286
1287         case ACT_CID: /* got cid; start dialing */
1288                 cs->cur_at_seq = SEQ_NONE;
1289                 channel = cs->curchannel;
1290                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1291                         cs->bcs[channel].at_state.cid = ev->parameter;
1292                         cs->bcs[channel].at_state.pending_commands |=
1293                                 PC_DIAL;
1294                         cs->commands_pending = 1;
1295                         break;
1296                 }
1297                 /* bad cid: fall through */
1298         case ACT_FAILCID:
1299                 cs->cur_at_seq = SEQ_NONE;
1300                 channel = cs->curchannel;
1301                 if (reinit_and_retry(cs, channel) < 0) {
1302                         dev_warn(cs->dev,
1303                                  "Could not get a call ID. Cannot dial.\n");
1304                         bcs2 = cs->bcs + channel;
1305                         disconnect_bc(&bcs2->at_state, cs, bcs2);
1306                 }
1307                 break;
1308         case ACT_ABORTCID:
1309                 cs->cur_at_seq = SEQ_NONE;
1310                 bcs2 = cs->bcs + cs->curchannel;
1311                 disconnect_bc(&bcs2->at_state, cs, bcs2);
1312                 break;
1313
1314         case ACT_DIALING:
1315         case ACT_ACCEPTED:
1316                 cs->cur_at_seq = SEQ_NONE;
1317                 break;
1318
1319         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1320                 if (bcs)
1321                         disconnect_bc(at_state, cs, bcs);
1322                 else
1323                         disconnect_nobc(p_at_state, cs);
1324                 break;
1325
1326         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1327                 cs->cur_at_seq = SEQ_NONE;
1328                 at_state->pending_commands |= PC_HUP;
1329                 cs->commands_pending = 1;
1330                 break;
1331
1332         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1333         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1334         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1335                 at_state->pending_commands |= PC_HUP;
1336                 cs->commands_pending = 1;
1337                 break;
1338         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1339                                are not handled properly anymore */
1340                 at_state->getstring = 1;
1341                 break;
1342         case ACT_SETVER:
1343                 if (!ev->ptr) {
1344                         *p_genresp = 1;
1345                         *p_resp_code = RSP_ERROR;
1346                         break;
1347                 }
1348                 s = ev->ptr;
1349
1350                 if (!strcmp(s, "OK")) {
1351                         /* OK without version string: assume old response */
1352                         *p_genresp = 1;
1353                         *p_resp_code = RSP_NONE;
1354                         break;
1355                 }
1356
1357                 for (i = 0; i < 4; ++i) {
1358                         val = simple_strtoul(s, (char **) &e, 10);
1359                         if (val > INT_MAX || e == s)
1360                                 break;
1361                         if (i == 3) {
1362                                 if (*e)
1363                                         break;
1364                         } else if (*e != '.')
1365                                 break;
1366                         else
1367                                 s = e + 1;
1368                         cs->fwver[i] = val;
1369                 }
1370                 if (i != 4) {
1371                         *p_genresp = 1;
1372                         *p_resp_code = RSP_ERROR;
1373                         break;
1374                 }
1375                 cs->gotfwver = 0;
1376                 break;
1377         case ACT_GOTVER:
1378                 if (cs->gotfwver == 0) {
1379                         cs->gotfwver = 1;
1380                         gig_dbg(DEBUG_EVENT,
1381                                 "firmware version %02d.%03d.%02d.%02d",
1382                                 cs->fwver[0], cs->fwver[1],
1383                                 cs->fwver[2], cs->fwver[3]);
1384                         break;
1385                 }
1386                 /* fall through */
1387         case ACT_FAILVER:
1388                 cs->gotfwver = -1;
1389                 dev_err(cs->dev, "could not read firmware version.\n");
1390                 break;
1391         case ACT_ERROR:
1392                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1393                         __func__, at_state->ConState);
1394                 cs->cur_at_seq = SEQ_NONE;
1395                 break;
1396         case ACT_DEBUG:
1397                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1398                         __func__, ev->type, at_state->ConState);
1399                 break;
1400         case ACT_WARN:
1401                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1402                          __func__, ev->type, at_state->ConState);
1403                 break;
1404         case ACT_ZCAU:
1405                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1406                          ev->parameter, at_state->ConState);
1407                 break;
1408
1409         /* events from the LL */
1410
1411         case ACT_DIAL:
1412                 if (!ev->ptr) {
1413                         *p_genresp = 1;
1414                         *p_resp_code = RSP_ERROR;
1415                         break;
1416                 }
1417                 start_dial(at_state, ev->ptr, ev->parameter);
1418                 break;
1419         case ACT_ACCEPT:
1420                 start_accept(at_state);
1421                 break;
1422         case ACT_HUP:
1423                 at_state->pending_commands |= PC_HUP;
1424                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1425                 cs->commands_pending = 1;
1426                 break;
1427
1428         /* hotplug events */
1429
1430         case ACT_STOP:
1431                 do_stop(cs);
1432                 break;
1433         case ACT_START:
1434                 do_start(cs);
1435                 break;
1436
1437         /* events from the interface */
1438
1439         case ACT_IF_LOCK:
1440                 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1441                 cs->waiting = 0;
1442                 wake_up(&cs->waitqueue);
1443                 break;
1444         case ACT_IF_VER:
1445                 if (ev->parameter != 0)
1446                         cs->cmd_result = -EINVAL;
1447                 else if (cs->gotfwver != 1) {
1448                         cs->cmd_result = -ENOENT;
1449                 } else {
1450                         memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1451                         cs->cmd_result = 0;
1452                 }
1453                 cs->waiting = 0;
1454                 wake_up(&cs->waitqueue);
1455                 break;
1456
1457         /* events from the proc file system */
1458
1459         case ACT_PROC_CIDMODE:
1460                 spin_lock_irqsave(&cs->lock, flags);
1461                 if (ev->parameter != cs->cidmode) {
1462                         cs->cidmode = ev->parameter;
1463                         if (ev->parameter) {
1464                                 cs->at_state.pending_commands |= PC_CIDMODE;
1465                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1466                         } else {
1467                                 cs->at_state.pending_commands |= PC_UMMODE;
1468                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1469                         }
1470                         cs->commands_pending = 1;
1471                 }
1472                 spin_unlock_irqrestore(&cs->lock, flags);
1473                 cs->waiting = 0;
1474                 wake_up(&cs->waitqueue);
1475                 break;
1476
1477         /* events from the hardware drivers */
1478
1479         case ACT_NOTIFY_BC_DOWN:
1480                 bchannel_down(bcs);
1481                 break;
1482         case ACT_NOTIFY_BC_UP:
1483                 bchannel_up(bcs);
1484                 break;
1485         case ACT_SHUTDOWN:
1486                 do_shutdown(cs);
1487                 break;
1488
1489
1490         default:
1491                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1492                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1493                         if (!*pp_command) {
1494                                 *p_genresp = 1;
1495                                 *p_resp_code = RSP_NULL;
1496                         }
1497                 } else
1498                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1499         }
1500 }
1501
1502 /* State machine to do the calling and hangup procedure */
1503 static void process_event(struct cardstate *cs, struct event_t *ev)
1504 {
1505         struct bc_state *bcs;
1506         char *p_command = NULL;
1507         struct reply_t *rep;
1508         int rcode;
1509         int genresp = 0;
1510         int resp_code = RSP_ERROR;
1511         struct at_state_t *at_state;
1512         int index;
1513         int curact;
1514         unsigned long flags;
1515
1516         if (ev->cid >= 0) {
1517                 at_state = at_state_from_cid(cs, ev->cid);
1518                 if (!at_state) {
1519                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1520                                 ev->type, ev->cid);
1521                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1522                                           NULL, 0, NULL);
1523                         return;
1524                 }
1525         } else {
1526                 at_state = ev->at_state;
1527                 if (at_state_invalid(cs, at_state)) {
1528                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1529                                 at_state);
1530                         return;
1531                 }
1532         }
1533
1534         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1535                 at_state->ConState, ev->type);
1536
1537         bcs = at_state->bcs;
1538
1539         /* Setting the pointer to the dial array */
1540         rep = at_state->replystruct;
1541
1542         spin_lock_irqsave(&cs->lock, flags);
1543         if (ev->type == EV_TIMEOUT) {
1544                 if (ev->parameter != at_state->timer_index
1545                     || !at_state->timer_active) {
1546                         ev->type = RSP_NONE; /* old timeout */
1547                         gig_dbg(DEBUG_EVENT, "old timeout");
1548                 } else {
1549                         if (at_state->waiting)
1550                                 gig_dbg(DEBUG_EVENT, "stopped waiting");
1551                         else
1552                                 gig_dbg(DEBUG_EVENT, "timeout occurred");
1553                 }
1554         }
1555         spin_unlock_irqrestore(&cs->lock, flags);
1556
1557         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1558            or at_state->str_var[STR_XXXX], set it */
1559         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1560                 index = ev->type - RSP_VAR;
1561                 at_state->int_var[index] = ev->parameter;
1562         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1563                 index = ev->type - RSP_STR;
1564                 kfree(at_state->str_var[index]);
1565                 at_state->str_var[index] = ev->ptr;
1566                 ev->ptr = NULL; /* prevent process_events() from
1567                                    deallocating ptr */
1568         }
1569
1570         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1571                 at_state->getstring = 0;
1572
1573         /* Search row in dial array which matches modem response and current
1574            constate */
1575         for (;; rep++) {
1576                 rcode = rep->resp_code;
1577                 if (rcode == RSP_LAST) {
1578                         /* found nothing...*/
1579                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1580                                  "resp_code %d in ConState %d!\n",
1581                                  __func__, ev->type, at_state->ConState);
1582                         return;
1583                 }
1584                 if ((rcode == RSP_ANY || rcode == ev->type)
1585                     && ((int) at_state->ConState >= rep->min_ConState)
1586                     && (rep->max_ConState < 0
1587                         || (int) at_state->ConState <= rep->max_ConState)
1588                     && (rep->parameter < 0 || rep->parameter == ev->parameter))
1589                         break;
1590         }
1591
1592         p_command = rep->command;
1593
1594         at_state->waiting = 0;
1595         for (curact = 0; curact < MAXACT; ++curact) {
1596                 /* The row tells us what we should do  ..
1597                  */
1598                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1599                           &genresp, &resp_code, ev);
1600                 if (!at_state)
1601                         /* at_state destroyed by disconnect */
1602                         return;
1603         }
1604
1605         /* Jump to the next con-state regarding the array */
1606         if (rep->new_ConState >= 0)
1607                 at_state->ConState = rep->new_ConState;
1608
1609         if (genresp) {
1610                 spin_lock_irqsave(&cs->lock, flags);
1611                 at_state->timer_expires = 0;
1612                 at_state->timer_active = 0;
1613                 spin_unlock_irqrestore(&cs->lock, flags);
1614                 gigaset_add_event(cs, at_state, resp_code, NULL, 0, NULL);
1615         } else {
1616                 /* Send command to modem if not NULL... */
1617                 if (p_command) {
1618                         if (cs->connected)
1619                                 send_command(cs, p_command, at_state);
1620                         else
1621                                 gigaset_add_event(cs, at_state, RSP_NODEV,
1622                                                   NULL, 0, NULL);
1623                 }
1624
1625                 spin_lock_irqsave(&cs->lock, flags);
1626                 if (!rep->timeout) {
1627                         at_state->timer_expires = 0;
1628                         at_state->timer_active = 0;
1629                 } else if (rep->timeout > 0) { /* new timeout */
1630                         at_state->timer_expires = rep->timeout * 10;
1631                         at_state->timer_active = 1;
1632                         ++at_state->timer_index;
1633                 }
1634                 spin_unlock_irqrestore(&cs->lock, flags);
1635         }
1636 }
1637
1638 static void schedule_sequence(struct cardstate *cs,
1639                               struct at_state_t *at_state, int sequence)
1640 {
1641         cs->cur_at_seq = sequence;
1642         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1643 }
1644
1645 static void process_command_flags(struct cardstate *cs)
1646 {
1647         struct at_state_t *at_state = NULL;
1648         struct bc_state *bcs;
1649         int i;
1650         int sequence;
1651         unsigned long flags;
1652
1653         cs->commands_pending = 0;
1654
1655         if (cs->cur_at_seq) {
1656                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1657                 return;
1658         }
1659
1660         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1661
1662         sequence = SEQ_NONE;
1663
1664         /* clear pending_commands and hangup channels on shutdown */
1665         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1666                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1667                 for (i = 0; i < cs->channels; ++i) {
1668                         bcs = cs->bcs + i;
1669                         at_state = &bcs->at_state;
1670                         at_state->pending_commands &=
1671                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1672                         if (at_state->cid > 0)
1673                                 at_state->pending_commands |= PC_HUP;
1674                         if (at_state->pending_commands & PC_CID) {
1675                                 at_state->pending_commands |= PC_NOCID;
1676                                 at_state->pending_commands &= ~PC_CID;
1677                         }
1678                 }
1679         }
1680
1681         /* clear pending_commands and hangup channels on reset */
1682         if (cs->at_state.pending_commands & PC_INIT) {
1683                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1684                 for (i = 0; i < cs->channels; ++i) {
1685                         bcs = cs->bcs + i;
1686                         at_state = &bcs->at_state;
1687                         at_state->pending_commands &=
1688                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1689                         if (at_state->cid > 0)
1690                                 at_state->pending_commands |= PC_HUP;
1691                         if (cs->mstate == MS_RECOVER) {
1692                                 if (at_state->pending_commands & PC_CID) {
1693                                         at_state->pending_commands |= PC_NOCID;
1694                                         at_state->pending_commands &= ~PC_CID;
1695                                 }
1696                         }
1697                 }
1698         }
1699
1700         /* only switch back to unimodem mode if no commands are pending and
1701          * no channels are up */
1702         spin_lock_irqsave(&cs->lock, flags);
1703         if (cs->at_state.pending_commands == PC_UMMODE
1704             && !cs->cidmode
1705             && list_empty(&cs->temp_at_states)
1706             && cs->mode == M_CID) {
1707                 sequence = SEQ_UMMODE;
1708                 at_state = &cs->at_state;
1709                 for (i = 0; i < cs->channels; ++i) {
1710                         bcs = cs->bcs + i;
1711                         if (bcs->at_state.pending_commands ||
1712                             bcs->at_state.cid > 0) {
1713                                 sequence = SEQ_NONE;
1714                                 break;
1715                         }
1716                 }
1717         }
1718         spin_unlock_irqrestore(&cs->lock, flags);
1719         cs->at_state.pending_commands &= ~PC_UMMODE;
1720         if (sequence != SEQ_NONE) {
1721                 schedule_sequence(cs, at_state, sequence);
1722                 return;
1723         }
1724
1725         for (i = 0; i < cs->channels; ++i) {
1726                 bcs = cs->bcs + i;
1727                 if (bcs->at_state.pending_commands & PC_HUP) {
1728                         if (cs->dle) {
1729                                 cs->curchannel = bcs->channel;
1730                                 schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1731                                 return;
1732                         }
1733                         bcs->at_state.pending_commands &= ~PC_HUP;
1734                         if (bcs->at_state.pending_commands & PC_CID) {
1735                                 /* not yet dialing: PC_NOCID is sufficient */
1736                                 bcs->at_state.pending_commands |= PC_NOCID;
1737                                 bcs->at_state.pending_commands &= ~PC_CID;
1738                         } else {
1739                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1740                                 return;
1741                         }
1742                 }
1743                 if (bcs->at_state.pending_commands & PC_NOCID) {
1744                         bcs->at_state.pending_commands &= ~PC_NOCID;
1745                         cs->curchannel = bcs->channel;
1746                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1747                         return;
1748                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1749                         bcs->at_state.pending_commands &= ~PC_DLE0;
1750                         cs->curchannel = bcs->channel;
1751                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1752                         return;
1753                 }
1754         }
1755
1756         list_for_each_entry(at_state, &cs->temp_at_states, list)
1757                 if (at_state->pending_commands & PC_HUP) {
1758                         at_state->pending_commands &= ~PC_HUP;
1759                         schedule_sequence(cs, at_state, SEQ_HUP);
1760                         return;
1761                 }
1762
1763         if (cs->at_state.pending_commands & PC_INIT) {
1764                 cs->at_state.pending_commands &= ~PC_INIT;
1765                 cs->dle = 0;
1766                 cs->inbuf->inputstate = INS_command;
1767                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1768                 return;
1769         }
1770         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1771                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1772                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1773                 return;
1774         }
1775         if (cs->at_state.pending_commands & PC_CIDMODE) {
1776                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1777                 if (cs->mode == M_UNIMODEM) {
1778                         cs->retry_count = 1;
1779                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1780                         return;
1781                 }
1782         }
1783
1784         for (i = 0; i < cs->channels; ++i) {
1785                 bcs = cs->bcs + i;
1786                 if (bcs->at_state.pending_commands & PC_DLE1) {
1787                         bcs->at_state.pending_commands &= ~PC_DLE1;
1788                         cs->curchannel = bcs->channel;
1789                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1790                         return;
1791                 }
1792                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1793                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1794                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1795                         return;
1796                 }
1797                 if (bcs->at_state.pending_commands & PC_DIAL) {
1798                         bcs->at_state.pending_commands &= ~PC_DIAL;
1799                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1800                         return;
1801                 }
1802                 if (bcs->at_state.pending_commands & PC_CID) {
1803                         switch (cs->mode) {
1804                         case M_UNIMODEM:
1805                                 cs->at_state.pending_commands |= PC_CIDMODE;
1806                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1807                                 cs->commands_pending = 1;
1808                                 return;
1809                         case M_UNKNOWN:
1810                                 schedule_init(cs, MS_INIT);
1811                                 return;
1812                         }
1813                         bcs->at_state.pending_commands &= ~PC_CID;
1814                         cs->curchannel = bcs->channel;
1815                         cs->retry_count = 2;
1816                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1817                         return;
1818                 }
1819         }
1820 }
1821
1822 static void process_events(struct cardstate *cs)
1823 {
1824         struct event_t *ev;
1825         unsigned head, tail;
1826         int i;
1827         int check_flags = 0;
1828         int was_busy;
1829         unsigned long flags;
1830
1831         spin_lock_irqsave(&cs->ev_lock, flags);
1832         head = cs->ev_head;
1833
1834         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1835                 tail = cs->ev_tail;
1836                 if (tail == head) {
1837                         if (!check_flags && !cs->commands_pending)
1838                                 break;
1839                         check_flags = 0;
1840                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1841                         process_command_flags(cs);
1842                         spin_lock_irqsave(&cs->ev_lock, flags);
1843                         tail = cs->ev_tail;
1844                         if (tail == head) {
1845                                 if (!cs->commands_pending)
1846                                         break;
1847                                 continue;
1848                         }
1849                 }
1850
1851                 ev = cs->events + head;
1852                 was_busy = cs->cur_at_seq != SEQ_NONE;
1853                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1854                 process_event(cs, ev);
1855                 spin_lock_irqsave(&cs->ev_lock, flags);
1856                 kfree(ev->ptr);
1857                 ev->ptr = NULL;
1858                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1859                         check_flags = 1;
1860
1861                 head = (head + 1) % MAX_EVENTS;
1862                 cs->ev_head = head;
1863         }
1864
1865         spin_unlock_irqrestore(&cs->ev_lock, flags);
1866
1867         if (i == 2 * MAX_EVENTS) {
1868                 dev_err(cs->dev,
1869                         "infinite loop in process_events; aborting.\n");
1870         }
1871 }
1872
1873 /* tasklet scheduled on any event received from the Gigaset device
1874  * parameter:
1875  *      data    ISDN controller state structure
1876  */
1877 void gigaset_handle_event(unsigned long data)
1878 {
1879         struct cardstate *cs = (struct cardstate *) data;
1880
1881         /* handle incoming data on control/common channel */
1882         if (cs->inbuf->head != cs->inbuf->tail) {
1883                 gig_dbg(DEBUG_INTR, "processing new data");
1884                 cs->ops->handle_input(cs->inbuf);
1885         }
1886
1887         process_events(cs);
1888 }