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 "gigaset.h"
  17
  18 /* ========================================================== */
  19 /* bit masks for pending commands */
  20 #define PC_DIAL         0x001
  21 #define PC_HUP          0x002
  22 #define PC_INIT         0x004
  23 #define PC_DLE0         0x008
  24 #define PC_DLE1         0x010
  25 #define PC_SHUTDOWN     0x020
  26 #define PC_ACCEPT       0x040
  27 #define PC_CID          0x080
  28 #define PC_NOCID        0x100
  29 #define PC_CIDMODE      0x200
  30 #define PC_UMMODE       0x400
  31
  32 /* types of modem responses */
  33 #define RT_NOTHING      0
  34 #define RT_ZSAU         1
  35 #define RT_RING         2
  36 #define RT_NUMBER       3
  37 #define RT_STRING       4
  38 #define RT_ZCAU         6
  39
  40 /* Possible ASCII responses */
  41 #define RSP_OK          0
  42 #define RSP_ERROR       1
  43 #define RSP_ZGCI        3
  44 #define RSP_RING        4
  45 #define RSP_ZVLS        5
  46 #define RSP_ZCAU        6
  47
  48 /* responses with values to store in at_state */
  49 /* - numeric */
  50 #define RSP_VAR         100
  51 #define RSP_ZSAU        (RSP_VAR + VAR_ZSAU)
  52 #define RSP_ZDLE        (RSP_VAR + VAR_ZDLE)
  53 #define RSP_ZCTP        (RSP_VAR + VAR_ZCTP)
  54 /* - string */
  55 #define RSP_STR         (RSP_VAR + VAR_NUM)
  56 #define RSP_NMBR        (RSP_STR + STR_NMBR)
  57 #define RSP_ZCPN        (RSP_STR + STR_ZCPN)
  58 #define RSP_ZCON        (RSP_STR + STR_ZCON)
  59 #define RSP_ZBC         (RSP_STR + STR_ZBC)
  60 #define RSP_ZHLC        (RSP_STR + STR_ZHLC)
  61
  62 #define RSP_WRONG_CID   -2      /* unknown cid in cmd */
  63 #define RSP_INVAL       -6      /* invalid response   */
  64 #define RSP_NODEV       -9      /* device not connected */
  65
  66 #define RSP_NONE        -19
  67 #define RSP_STRING      -20
  68 #define RSP_NULL        -21
  69 #define RSP_INIT        -27
  70 #define RSP_ANY         -26
  71 #define RSP_LAST        -28
  72
  73 /* actions for process_response */
  74 #define ACT_NOTHING             0
  75 #define ACT_SETDLE1             1
  76 #define ACT_SETDLE0             2
  77 #define ACT_FAILINIT            3
  78 #define ACT_HUPMODEM            4
  79 #define ACT_CONFIGMODE          5
  80 #define ACT_INIT                6
  81 #define ACT_DLE0                7
  82 #define ACT_DLE1                8
  83 #define ACT_FAILDLE0            9
  84 #define ACT_FAILDLE1            10
  85 #define ACT_RING                11
  86 #define ACT_CID                 12
  87 #define ACT_FAILCID             13
  88 #define ACT_SDOWN               14
  89 #define ACT_FAILSDOWN           15
  90 #define ACT_DEBUG               16
  91 #define ACT_WARN                17
  92 #define ACT_DIALING             18
  93 #define ACT_ABORTDIAL           19
  94 #define ACT_DISCONNECT          20
  95 #define ACT_CONNECT             21
  96 #define ACT_REMOTEREJECT        22
  97 #define ACT_CONNTIMEOUT         23
  98 #define ACT_REMOTEHUP           24
  99 #define ACT_ABORTHUP            25
 100 #define ACT_ICALL               26
 101 #define ACT_ACCEPTED            27
 102 #define ACT_ABORTACCEPT         28
 103 #define ACT_TIMEOUT             29
 104 #define ACT_GETSTRING           30
 105 #define ACT_SETVER              31
 106 #define ACT_FAILVER             32
 107 #define ACT_GOTVER              33
 108 #define ACT_TEST                34
 109 #define ACT_ERROR               35
 110 #define ACT_ABORTCID            36
 111 #define ACT_ZCAU                37
 112 #define ACT_NOTIFY_BC_DOWN      38
 113 #define ACT_NOTIFY_BC_UP        39
 114 #define ACT_DIAL                40
 115 #define ACT_ACCEPT              41
 116 #define ACT_HUP                 43
 117 #define ACT_IF_LOCK             44
 118 #define ACT_START               45
 119 #define ACT_STOP                46
 120 #define ACT_FAKEDLE0            47
 121 #define ACT_FAKEHUP             48
 122 #define ACT_FAKESDOWN           49
 123 #define ACT_SHUTDOWN            50
 124 #define ACT_PROC_CIDMODE        51
 125 #define ACT_UMODESET            52
 126 #define ACT_FAILUMODE           53
 127 #define ACT_CMODESET            54
 128 #define ACT_FAILCMODE           55
 129 #define ACT_IF_VER              56
 130 #define ACT_CMD                 100
 131
 132 /* at command sequences */
 133 #define SEQ_NONE        0
 134 #define SEQ_INIT        100
 135 #define SEQ_DLE0        200
 136 #define SEQ_DLE1        250
 137 #define SEQ_CID         300
 138 #define SEQ_NOCID       350
 139 #define SEQ_HUP         400
 140 #define SEQ_DIAL        600
 141 #define SEQ_ACCEPT      720
 142 #define SEQ_SHUTDOWN    500
 143 #define SEQ_CIDMODE     10
 144 #define SEQ_UMMODE      11
 145
 146
 147 /* 100: init, 200: dle0, 250:dle1, 300: get cid (dial), 350: "hup" (no cid),
 148  * 400: hup, 500: reset, 600: dial, 700: ring */
 149 struct reply_t gigaset_tab_nocid[] =
 150 {
 151 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
 152  * action, command */
 153
 154 /* initialize device, set cid mode if possible */
 155 {RSP_INIT,       -1,  -1, SEQ_INIT,             100,  1, {ACT_TIMEOUT} },
 156
 157 {EV_TIMEOUT,    100, 100, -1,                   101,  3, {0},   "Z\r"},
 158 {RSP_OK,        101, 103, -1,                   120,  5, {ACT_GETSTRING},
 159                                                                 "+GMR\r"},
 160
 161 {EV_TIMEOUT,    101, 101, -1,                   102,  5, {0},   "Z\r"},
 162 {RSP_ERROR,     101, 101, -1,                   102,  5, {0},   "Z\r"},
 163
 164 {EV_TIMEOUT,    102, 102, -1,                   108,  5, {ACT_SETDLE1},
 165                                                                 "^SDLE=0\r"},
 166 {RSP_OK,        108, 108, -1,                   104, -1},
 167 {RSP_ZDLE,      104, 104,  0,                   103,  5, {0},   "Z\r"},
 168 {EV_TIMEOUT,    104, 104, -1,                     0,  0, {ACT_FAILINIT} },
 169 {RSP_ERROR,     108, 108, -1,                     0,  0, {ACT_FAILINIT} },
 170
 171 {EV_TIMEOUT,    108, 108, -1,                   105,  2, {ACT_SETDLE0,
 172                                                           ACT_HUPMODEM,
 173                                                           ACT_TIMEOUT} },
 174 {EV_TIMEOUT,    105, 105, -1,                   103,  5, {0},   "Z\r"},
 175
 176 {RSP_ERROR,     102, 102, -1,                   107,  5, {0},   "^GETPRE\r"},
 177 {RSP_OK,        107, 107, -1,                     0,  0, {ACT_CONFIGMODE} },
 178 {RSP_ERROR,     107, 107, -1,                     0,  0, {ACT_FAILINIT} },
 179 {EV_TIMEOUT,    107, 107, -1,                     0,  0, {ACT_FAILINIT} },
 180
 181 {RSP_ERROR,     103, 103, -1,                     0,  0, {ACT_FAILINIT} },
 182 {EV_TIMEOUT,    103, 103, -1,                     0,  0, {ACT_FAILINIT} },
 183
 184 {RSP_STRING,    120, 120, -1,                   121, -1, {ACT_SETVER} },
 185
 186 {EV_TIMEOUT,    120, 121, -1,                     0,  0, {ACT_FAILVER,
 187                                                           ACT_INIT} },
 188 {RSP_ERROR,     120, 121, -1,                     0,  0, {ACT_FAILVER,
 189                                                           ACT_INIT} },
 190 {RSP_OK,        121, 121, -1,                     0,  0, {ACT_GOTVER,
 191                                                           ACT_INIT} },
 192
 193 /* leave dle mode */
 194 {RSP_INIT,        0,   0, SEQ_DLE0,             201,  5, {0},   "^SDLE=0\r"},
 195 {RSP_OK,        201, 201, -1,                   202, -1},
 196 {RSP_ZDLE,      202, 202,  0,                     0,  0, {ACT_DLE0} },
 197 {RSP_NODEV,     200, 249, -1,                     0,  0, {ACT_FAKEDLE0} },
 198 {RSP_ERROR,     200, 249, -1,                     0,  0, {ACT_FAILDLE0} },
 199 {EV_TIMEOUT,    200, 249, -1,                     0,  0, {ACT_FAILDLE0} },
 200
 201 /* enter dle mode */
 202 {RSP_INIT,        0,   0, SEQ_DLE1,             251,  5, {0},   "^SDLE=1\r"},
 203 {RSP_OK,        251, 251, -1,                   252, -1},
 204 {RSP_ZDLE,      252, 252,  1,                     0,  0, {ACT_DLE1} },
 205 {RSP_ERROR,     250, 299, -1,                     0,  0, {ACT_FAILDLE1} },
 206 {EV_TIMEOUT,    250, 299, -1,                     0,  0, {ACT_FAILDLE1} },
 207
 208 /* incoming call */
 209 {RSP_RING,       -1,  -1, -1,                    -1, -1, {ACT_RING} },
 210
 211 /* get cid */
 212 {RSP_INIT,        0,   0, SEQ_CID,              301,  5, {0},   "^SGCI?\r"},
 213 {RSP_OK,        301, 301, -1,                   302, -1},
 214 {RSP_ZGCI,      302, 302, -1,                     0,  0, {ACT_CID} },
 215 {RSP_ERROR,     301, 349, -1,                     0,  0, {ACT_FAILCID} },
 216 {EV_TIMEOUT,    301, 349, -1,                     0,  0, {ACT_FAILCID} },
 217
 218 /* enter cid mode */
 219 {RSP_INIT,        0,   0, SEQ_CIDMODE,          150,  5, {0},   "^SGCI=1\r"},
 220 {RSP_OK,        150, 150, -1,                     0,  0, {ACT_CMODESET} },
 221 {RSP_ERROR,     150, 150, -1,                     0,  0, {ACT_FAILCMODE} },
 222 {EV_TIMEOUT,    150, 150, -1,                     0,  0, {ACT_FAILCMODE} },
 223
 224 /* leave cid mode */
 225 {RSP_INIT,        0,   0, SEQ_UMMODE,           160,  5, {0},   "Z\r"},
 226 {RSP_OK,        160, 160, -1,                     0,  0, {ACT_UMODESET} },
 227 {RSP_ERROR,     160, 160, -1,                     0,  0, {ACT_FAILUMODE} },
 228 {EV_TIMEOUT,    160, 160, -1,                     0,  0, {ACT_FAILUMODE} },
 229
 230 /* abort getting cid */
 231 {RSP_INIT,        0,   0, SEQ_NOCID,              0,  0, {ACT_ABORTCID} },
 232
 233 /* reset */
 234 {RSP_INIT,        0,   0, SEQ_SHUTDOWN,         504,  5, {0},   "Z\r"},
 235 {RSP_OK,        504, 504, -1,                     0,  0, {ACT_SDOWN} },
 236 {RSP_ERROR,     501, 599, -1,                     0,  0, {ACT_FAILSDOWN} },
 237 {EV_TIMEOUT,    501, 599, -1,                     0,  0, {ACT_FAILSDOWN} },
 238 {RSP_NODEV,     501, 599, -1,                     0,  0, {ACT_FAKESDOWN} },
 239
 240 {EV_PROC_CIDMODE, -1, -1, -1,                    -1, -1, {ACT_PROC_CIDMODE} },
 241 {EV_IF_LOCK,     -1,  -1, -1,                    -1, -1, {ACT_IF_LOCK} },
 242 {EV_IF_VER,      -1,  -1, -1,                    -1, -1, {ACT_IF_VER} },
 243 {EV_START,       -1,  -1, -1,                    -1, -1, {ACT_START} },
 244 {EV_STOP,        -1,  -1, -1,                    -1, -1, {ACT_STOP} },
 245 {EV_SHUTDOWN,    -1,  -1, -1,                    -1, -1, {ACT_SHUTDOWN} },
 246
 247 /* misc. */
 248 {RSP_ERROR,      -1,  -1, -1,                    -1, -1, {ACT_ERROR} },
 249 {RSP_ZCAU,       -1,  -1, -1,                    -1, -1, {ACT_ZCAU} },
 250 {RSP_NONE,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 251 {RSP_ANY,        -1,  -1, -1,                    -1, -1, {ACT_WARN} },
 252 {RSP_LAST}
 253 };
 254
 255 /* 600: start dialing, 650: dial in progress, 800: connection is up, 700: ring,
 256  * 400: hup, 750: accepted icall */
 257 struct reply_t gigaset_tab_cid[] =
 258 {
 259 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
 260  * action, command */
 261
 262 /* dial */
 263 {EV_DIAL,        -1,  -1, -1,                    -1, -1, {ACT_DIAL} },
 264 {RSP_INIT,        0,   0, SEQ_DIAL,             601,  5, {ACT_CMD+AT_BC} },
 265 {RSP_OK,        601, 601, -1,                   603,  5, {ACT_CMD+AT_PROTO} },
 266 {RSP_OK,        603, 603, -1,                   604,  5, {ACT_CMD+AT_TYPE} },
 267 {RSP_OK,        604, 604, -1,                   605,  5, {ACT_CMD+AT_MSN} },
 268 {RSP_NULL,      605, 605, -1,                   606,  5, {ACT_CMD+AT_CLIP} },
 269 {RSP_OK,        605, 605, -1,                   606,  5, {ACT_CMD+AT_CLIP} },
 270 {RSP_NULL,      606, 606, -1,                   607,  5, {ACT_CMD+AT_ISO} },
 271 {RSP_OK,        606, 606, -1,                   607,  5, {ACT_CMD+AT_ISO} },
 272 {RSP_OK,        607, 607, -1,                   608,  5, {0},   "+VLS=17\r"},
 273 {RSP_OK,        608, 608, -1,                   609, -1},
 274 {RSP_ZSAU,      609, 609, ZSAU_PROCEEDING,      610,  5, {ACT_CMD+AT_DIAL} },
 275 {RSP_OK,        610, 610, -1,                   650,  0, {ACT_DIALING} },
 276
 277 {RSP_ERROR,     601, 610, -1,                     0,  0, {ACT_ABORTDIAL} },
 278 {EV_TIMEOUT,    601, 610, -1,                     0,  0, {ACT_ABORTDIAL} },
 279
 280 /* optional dialing responses */
 281 {EV_BC_OPEN,    650, 650, -1,                   651, -1},
 282 {RSP_ZVLS,      609, 651, 17,                    -1, -1, {ACT_DEBUG} },
 283 {RSP_ZCTP,      610, 651, -1,                    -1, -1, {ACT_DEBUG} },
 284 {RSP_ZCPN,      610, 651, -1,                    -1, -1, {ACT_DEBUG} },
 285 {RSP_ZSAU,      650, 651, ZSAU_CALL_DELIVERED,   -1, -1, {ACT_DEBUG} },
 286
 287 /* connect */
 288 {RSP_ZSAU,      650, 650, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT} },
 289 {RSP_ZSAU,      651, 651, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT,
 290                                                           ACT_NOTIFY_BC_UP} },
 291 {RSP_ZSAU,      750, 750, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT} },
 292 {RSP_ZSAU,      751, 751, ZSAU_ACTIVE,          800, -1, {ACT_CONNECT,
 293                                                           ACT_NOTIFY_BC_UP} },
 294 {EV_BC_OPEN,    800, 800, -1,                   800, -1, {ACT_NOTIFY_BC_UP} },
 295
 296 /* remote hangup */
 297 {RSP_ZSAU,      650, 651, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEREJECT} },
 298 {RSP_ZSAU,      750, 751, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEHUP} },
 299 {RSP_ZSAU,      800, 800, ZSAU_DISCONNECT_IND,    0,  0, {ACT_REMOTEHUP} },
 300
 301 /* hangup */
 302 {EV_HUP,         -1,  -1, -1,                    -1, -1, {ACT_HUP} },
 303 {RSP_INIT,       -1,  -1, SEQ_HUP,              401,  5, {0},   "+VLS=0\r"},
 304 {RSP_OK,        401, 401, -1,                   402,  5},
 305 {RSP_ZVLS,      402, 402,  0,                   403,  5},
 306 {RSP_ZSAU,      403, 403, ZSAU_DISCONNECT_REQ,   -1, -1, {ACT_DEBUG} },
 307 {RSP_ZSAU,      403, 403, ZSAU_NULL,              0,  0, {ACT_DISCONNECT} },
 308 {RSP_NODEV,     401, 403, -1,                     0,  0, {ACT_FAKEHUP} },
 309 {RSP_ERROR,     401, 401, -1,                     0,  0, {ACT_ABORTHUP} },
 310 {EV_TIMEOUT,    401, 403, -1,                     0,  0, {ACT_ABORTHUP} },
 311
 312 {EV_BC_CLOSED,    0,   0, -1,                     0, -1, {ACT_NOTIFY_BC_DOWN} },
 313
 314 /* ring */
 315 {RSP_ZBC,       700, 700, -1,                    -1, -1, {0} },
 316 {RSP_ZHLC,      700, 700, -1,                    -1, -1, {0} },
 317 {RSP_NMBR,      700, 700, -1,                    -1, -1, {0} },
 318 {RSP_ZCPN,      700, 700, -1,                    -1, -1, {0} },
 319 {RSP_ZCTP,      700, 700, -1,                    -1, -1, {0} },
 320 {EV_TIMEOUT,    700, 700, -1,                   720, 720, {ACT_ICALL} },
 321 {EV_BC_CLOSED,  720, 720, -1,                     0, -1, {ACT_NOTIFY_BC_DOWN} },
 322
 323 /*accept icall*/
 324 {EV_ACCEPT,      -1,  -1, -1,                    -1, -1, {ACT_ACCEPT} },
 325 {RSP_INIT,      720, 720, SEQ_ACCEPT,           721,  5, {ACT_CMD+AT_PROTO} },
 326 {RSP_OK,        721, 721, -1,                   722,  5, {ACT_CMD+AT_ISO} },
 327 {RSP_OK,        722, 722, -1,                   723,  5, {0},   "+VLS=17\r"},
 328 {RSP_OK,        723, 723, -1,                   724,  5, {0} },
 329 {RSP_ZVLS,      724, 724, 17,                   750, 50, {ACT_ACCEPTED} },
 330 {RSP_ERROR,     721, 729, -1,                     0,  0, {ACT_ABORTACCEPT} },
 331 {EV_TIMEOUT,    721, 729, -1,                     0,  0, {ACT_ABORTACCEPT} },
 332 {RSP_ZSAU,      700, 729, ZSAU_NULL,              0,  0, {ACT_ABORTACCEPT} },
 333 {RSP_ZSAU,      700, 729, ZSAU_ACTIVE,            0,  0, {ACT_ABORTACCEPT} },
 334 {RSP_ZSAU,      700, 729, ZSAU_DISCONNECT_IND,    0,  0, {ACT_ABORTACCEPT} },
 335
 336 {EV_BC_OPEN,    750, 750, -1,                   751, -1},
 337 {EV_TIMEOUT,    750, 751, -1,                     0,  0, {ACT_CONNTIMEOUT} },
 338
 339 /* B channel closed (general case) */
 340 {EV_BC_CLOSED,   -1,  -1, -1,                    -1, -1, {ACT_NOTIFY_BC_DOWN} },
 341
 342 /* misc. */
 343 {RSP_ZCON,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 344 {RSP_ZCAU,       -1,  -1, -1,                    -1, -1, {ACT_ZCAU} },
 345 {RSP_NONE,       -1,  -1, -1,                    -1, -1, {ACT_DEBUG} },
 346 {RSP_ANY,        -1,  -1, -1,                    -1, -1, {ACT_WARN} },
 347 {RSP_LAST}
 348 };
 349
 350
 351 static const struct resp_type_t {
 352         unsigned char   *response;
 353         int             resp_code;
 354         int             type;
 355 } resp_type[] =
 356 {
 357         {"OK",          RSP_OK,         RT_NOTHING},
 358         {"ERROR",       RSP_ERROR,      RT_NOTHING},
 359         {"ZSAU",        RSP_ZSAU,       RT_ZSAU},
 360         {"ZCAU",        RSP_ZCAU,       RT_ZCAU},
 361         {"RING",        RSP_RING,       RT_RING},
 362         {"ZGCI",        RSP_ZGCI,       RT_NUMBER},
 363         {"ZVLS",        RSP_ZVLS,       RT_NUMBER},
 364         {"ZCTP",        RSP_ZCTP,       RT_NUMBER},
 365         {"ZDLE",        RSP_ZDLE,       RT_NUMBER},
 366         {"ZHLC",        RSP_ZHLC,       RT_STRING},
 367         {"ZBC",         RSP_ZBC,        RT_STRING},
 368         {"NMBR",        RSP_NMBR,       RT_STRING},
 369         {"ZCPN",        RSP_ZCPN,       RT_STRING},
 370         {"ZCON",        RSP_ZCON,       RT_STRING},
 371         {NULL,          0,              0}
 372 };
 373
 374 static const struct zsau_resp_t {
 375         unsigned char   *str;
 376         int             code;
 377 } zsau_resp[] =
 378 {
 379         {"OUTGOING_CALL_PROCEEDING",    ZSAU_OUTGOING_CALL_PROCEEDING},
 380         {"CALL_DELIVERED",              ZSAU_CALL_DELIVERED},
 381         {"ACTIVE",                      ZSAU_ACTIVE},
 382         {"DISCONNECT_IND",              ZSAU_DISCONNECT_IND},
 383         {"NULL",                        ZSAU_NULL},
 384         {"DISCONNECT_REQ",              ZSAU_DISCONNECT_REQ},
 385         {NULL,                          ZSAU_UNKNOWN}
 386 };
 387
 388 /* retrieve CID from parsed response
 389  * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
 390  */
 391 static int cid_of_response(char *s)
 392 {
 393         unsigned long cid;
 394         int rc;
 395
 396         if (s[-1] != ';')
 397                 return 0;       /* no CID separator */
 398         rc = strict_strtoul(s, 10, &cid);
 399         if (rc)
 400                 return 0;       /* CID not numeric */
 401         if (cid < 1 || cid > 65535)
 402                 return -1;      /* CID out of range */
 403         return cid;
 404 }
 405
 406 /**
 407  * gigaset_handle_modem_response() - process received modem response
 408  * @cs:         device descriptor structure.
 409  *
 410  * Called by asyncdata/isocdata if a block of data received from the
 411  * device must be processed as a modem command response. The data is
 412  * already in the cs structure.
 413  */
 414 void gigaset_handle_modem_response(struct cardstate *cs)
 415 {
 416         unsigned char *argv[MAX_REC_PARAMS + 1];
 417         int params;
 418         int i, j;
 419         const struct resp_type_t *rt;
 420         const struct zsau_resp_t *zr;
 421         int curarg;
 422         unsigned long flags;
 423         unsigned next, tail, head;
 424         struct event_t *event;
 425         int resp_code;
 426         int param_type;
 427         int abort;
 428         size_t len;
 429         int cid;
 430         int rawstring;
 431
 432         len = cs->cbytes;
 433         if (!len) {
 434                 /* ignore additional LFs/CRs (M10x config mode or cx100) */
 435                 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[len]);
 436                 return;
 437         }
 438         cs->respdata[len] = 0;
 439         argv[0] = cs->respdata;
 440         params = 1;
 441         if (cs->at_state.getstring) {
 442                 /* getstring only allowed without cid at the moment */
 443                 cs->at_state.getstring = 0;
 444                 rawstring = 1;
 445                 cid = 0;
 446         } else {
 447                 /* parse line */
 448                 for (i = 0; i < len; i++)
 449                         switch (cs->respdata[i]) {
 450                         case ';':
 451                         case ',':
 452                         case '=':
 453                                 if (params > MAX_REC_PARAMS) {
 454                                         dev_warn(cs->dev,
 455                                            "too many parameters in response\n");
 456                                         /* need last parameter (might be CID) */
 457                                         params--;
 458                                 }
 459                                 argv[params++] = cs->respdata + i + 1;
 460                         }
 461
 462                 rawstring = 0;
 463                 cid = params > 1 ? cid_of_response(argv[params-1]) : 0;
 464                 if (cid < 0) {
 465                         gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
 466                                           NULL, 0, NULL);
 467                         return;
 468                 }
 469
 470                 for (j = 1; j < params; ++j)
 471                         argv[j][-1] = 0;
 472
 473                 gig_dbg(DEBUG_EVENT, "CMD received: %s", argv[0]);
 474                 if (cid) {
 475                         --params;
 476                         gig_dbg(DEBUG_EVENT, "CID: %s", argv[params]);
 477                 }
 478                 gig_dbg(DEBUG_EVENT, "available params: %d", params - 1);
 479                 for (j = 1; j < params; j++)
 480                         gig_dbg(DEBUG_EVENT, "param %d: %s", j, argv[j]);
 481         }
 482
 483         spin_lock_irqsave(&cs->ev_lock, flags);
 484         head = cs->ev_head;
 485         tail = cs->ev_tail;
 486
 487         abort = 1;
 488         curarg = 0;
 489         while (curarg < params) {
 490                 next = (tail + 1) % MAX_EVENTS;
 491                 if (unlikely(next == head)) {
 492                         dev_err(cs->dev, "event queue full\n");
 493                         break;
 494                 }
 495
 496                 event = cs->events + tail;
 497                 event->at_state = NULL;
 498                 event->cid = cid;
 499                 event->ptr = NULL;
 500                 event->arg = NULL;
 501                 tail = next;
 502
 503                 if (rawstring) {
 504                         resp_code = RSP_STRING;
 505                         param_type = RT_STRING;
 506                 } else {
 507                         for (rt = resp_type; rt->response; ++rt)
 508                                 if (!strcmp(argv[curarg], rt->response))
 509                                         break;
 510
 511                         if (!rt->response) {
 512                                 event->type = RSP_NONE;
 513                                 gig_dbg(DEBUG_EVENT,
 514                                         "unknown modem response: '%s'\n",
 515                                         argv[curarg]);
 516                                 break;
 517                         }
 518
 519                         resp_code = rt->resp_code;
 520                         param_type = rt->type;
 521                         ++curarg;
 522                 }
 523
 524                 event->type = resp_code;
 525
 526                 switch (param_type) {
 527                 case RT_NOTHING:
 528                         break;
 529                 case RT_RING:
 530                         if (!cid) {
 531                                 dev_err(cs->dev,
 532                                         "received RING without CID!\n");
 533                                 event->type = RSP_INVAL;
 534                                 abort = 1;
 535                         } else {
 536                                 event->cid = 0;
 537                                 event->parameter = cid;
 538                                 abort = 0;
 539                         }
 540                         break;
 541                 case RT_ZSAU:
 542                         if (curarg >= params) {
 543                                 event->parameter = ZSAU_NONE;
 544                                 break;
 545                         }
 546                         for (zr = zsau_resp; zr->str; ++zr)
 547                                 if (!strcmp(argv[curarg], zr->str))
 548                                         break;
 549                         event->parameter = zr->code;
 550                         if (!zr->str)
 551                                 dev_warn(cs->dev,
 552                                         "%s: unknown parameter %s after ZSAU\n",
 553                                          __func__, argv[curarg]);
 554                         ++curarg;
 555                         break;
 556                 case RT_STRING:
 557                         if (curarg < params) {
 558                                 event->ptr = kstrdup(argv[curarg], GFP_ATOMIC);
 559                                 if (!event->ptr)
 560                                         dev_err(cs->dev, "out of memory\n");
 561                                 ++curarg;
 562                         }
 563                         gig_dbg(DEBUG_EVENT, "string==%s",
 564                                 event->ptr ? (char *) event->ptr : "NULL");
 565                         break;
 566                 case RT_ZCAU:
 567                         event->parameter = -1;
 568                         if (curarg + 1 < params) {
 569                                 unsigned long type, value;
 570
 571                                 i = strict_strtoul(argv[curarg++], 16, &type);
 572                                 j = strict_strtoul(argv[curarg++], 16, &value);
 573
 574                                 if (i == 0 && type < 256 &&
 575                                     j == 0 && value < 256)
 576                                         event->parameter = (type << 8) | value;
 577                         } else
 578                                 curarg = params - 1;
 579                         break;
 580                 case RT_NUMBER:
 581                         event->parameter = -1;
 582                         if (curarg < params) {
 583                                 unsigned long res;
 584                                 int rc;
 585
 586                                 rc = strict_strtoul(argv[curarg++], 10, &res);
 587                                 if (rc == 0)
 588                                         event->parameter = res;
 589                         }
 590                         gig_dbg(DEBUG_EVENT, "parameter==%d", event->parameter);
 591                         break;
 592                 }
 593
 594                 if (resp_code == RSP_ZDLE)
 595                         cs->dle = event->parameter;
 596
 597                 if (abort)
 598                         break;
 599         }
 600
 601         cs->ev_tail = tail;
 602         spin_unlock_irqrestore(&cs->ev_lock, flags);
 603
 604         if (curarg != params)
 605                 gig_dbg(DEBUG_EVENT,
 606                         "invalid number of processed parameters: %d/%d",
 607                         curarg, params);
 608 }
 609 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
 610
 611 /* disconnect
 612  * process closing of connection associated with given AT state structure
 613  */
 614 static void disconnect(struct at_state_t **at_state_p)
 615 {
 616         unsigned long flags;
 617         struct bc_state *bcs = (*at_state_p)->bcs;
 618         struct cardstate *cs = (*at_state_p)->cs;
 619
 620         spin_lock_irqsave(&cs->lock, flags);
 621         ++(*at_state_p)->seq_index;
 622
 623         /* revert to selected idle mode */
 624         if (!cs->cidmode) {
 625                 cs->at_state.pending_commands |= PC_UMMODE;
 626                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 627                 cs->commands_pending = 1;
 628         }
 629         spin_unlock_irqrestore(&cs->lock, flags);
 630
 631         if (bcs) {
 632                 /* B channel assigned: invoke hardware specific handler */
 633                 cs->ops->close_bchannel(bcs);
 634                 /* notify LL */
 635                 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 636                         bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 637                         gigaset_isdn_hupD(bcs);
 638                 }
 639         } else {
 640                 /* no B channel assigned: just deallocate */
 641                 spin_lock_irqsave(&cs->lock, flags);
 642                 list_del(&(*at_state_p)->list);
 643                 kfree(*at_state_p);
 644                 *at_state_p = NULL;
 645                 spin_unlock_irqrestore(&cs->lock, flags);
 646         }
 647 }
 648
 649 /* get_free_channel
 650  * get a free AT state structure: either one of those associated with the
 651  * B channels of the Gigaset device, or if none of those is available,
 652  * a newly allocated one with bcs=NULL
 653  * The structure should be freed by calling disconnect() after use.
 654  */
 655 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 656                                                   int cid)
 657 /* cids: >0: siemens-cid
 658           0: without cid
 659          -1: no cid assigned yet
 660 */
 661 {
 662         unsigned long flags;
 663         int i;
 664         struct at_state_t *ret;
 665
 666         for (i = 0; i < cs->channels; ++i)
 667                 if (gigaset_get_channel(cs->bcs + i)) {
 668                         ret = &cs->bcs[i].at_state;
 669                         ret->cid = cid;
 670                         return ret;
 671                 }
 672
 673         spin_lock_irqsave(&cs->lock, flags);
 674         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 675         if (ret) {
 676                 gigaset_at_init(ret, NULL, cs, cid);
 677                 list_add(&ret->list, &cs->temp_at_states);
 678         }
 679         spin_unlock_irqrestore(&cs->lock, flags);
 680         return ret;
 681 }
 682
 683 static void init_failed(struct cardstate *cs, int mode)
 684 {
 685         int i;
 686         struct at_state_t *at_state;
 687
 688         cs->at_state.pending_commands &= ~PC_INIT;
 689         cs->mode = mode;
 690         cs->mstate = MS_UNINITIALIZED;
 691         gigaset_free_channels(cs);
 692         for (i = 0; i < cs->channels; ++i) {
 693                 at_state = &cs->bcs[i].at_state;
 694                 if (at_state->pending_commands & PC_CID) {
 695                         at_state->pending_commands &= ~PC_CID;
 696                         at_state->pending_commands |= PC_NOCID;
 697                         cs->commands_pending = 1;
 698                 }
 699         }
 700 }
 701
 702 static void schedule_init(struct cardstate *cs, int state)
 703 {
 704         if (cs->at_state.pending_commands & PC_INIT) {
 705                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 706                 return;
 707         }
 708         cs->mstate = state;
 709         cs->mode = M_UNKNOWN;
 710         gigaset_block_channels(cs);
 711         cs->at_state.pending_commands |= PC_INIT;
 712         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 713         cs->commands_pending = 1;
 714 }
 715
 716 /* Add "AT" to a command, add the cid, dle encode it, send the result to the
 717    hardware. */
 718 static void send_command(struct cardstate *cs, const char *cmd, int cid,
 719                          int dle, gfp_t kmallocflags)
 720 {
 721         struct cmdbuf_t *cb;
 722         size_t buflen;
 723
 724         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 725         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, kmallocflags);
 726         if (!cb) {
 727                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 728                 return;
 729         }
 730         if (cid > 0 && cid <= 65535)
 731                 cb->len = snprintf(cb->buf, buflen,
 732                                   dle ? "\020(AT%d%s\020)" : "AT%d%s",
 733                                   cid, cmd);
 734         else
 735                 cb->len = snprintf(cb->buf, buflen,
 736                                   dle ? "\020(AT%s\020)" : "AT%s",
 737                                   cmd);
 738         cb->offset = 0;
 739         cb->next = NULL;
 740         cb->wake_tasklet = NULL;
 741         cs->ops->write_cmd(cs, cb);
 742 }
 743
 744 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 745 {
 746         struct at_state_t *at_state;
 747         int i;
 748         unsigned long flags;
 749
 750         if (cid == 0)
 751                 return &cs->at_state;
 752
 753         for (i = 0; i < cs->channels; ++i)
 754                 if (cid == cs->bcs[i].at_state.cid)
 755                         return &cs->bcs[i].at_state;
 756
 757         spin_lock_irqsave(&cs->lock, flags);
 758
 759         list_for_each_entry(at_state, &cs->temp_at_states, list)
 760                 if (cid == at_state->cid) {
 761                         spin_unlock_irqrestore(&cs->lock, flags);
 762                         return at_state;
 763                 }
 764
 765         spin_unlock_irqrestore(&cs->lock, flags);
 766
 767         return NULL;
 768 }
 769
 770 static void bchannel_down(struct bc_state *bcs)
 771 {
 772         if (bcs->chstate & CHS_B_UP) {
 773                 bcs->chstate &= ~CHS_B_UP;
 774                 gigaset_isdn_hupB(bcs);
 775         }
 776
 777         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 778                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 779                 gigaset_isdn_hupD(bcs);
 780         }
 781
 782         gigaset_free_channel(bcs);
 783
 784         gigaset_bcs_reinit(bcs);
 785 }
 786
 787 static void bchannel_up(struct bc_state *bcs)
 788 {
 789         if (bcs->chstate & CHS_B_UP) {
 790                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 791                            __func__);
 792                 return;
 793         }
 794
 795         bcs->chstate |= CHS_B_UP;
 796         gigaset_isdn_connB(bcs);
 797 }
 798
 799 static void start_dial(struct at_state_t *at_state, void *data,
 800                         unsigned seq_index)
 801 {
 802         struct bc_state *bcs = at_state->bcs;
 803         struct cardstate *cs = at_state->cs;
 804         char **commands = data;
 805         unsigned long flags;
 806         int i;
 807
 808         bcs->chstate |= CHS_NOTIFY_LL;
 809
 810         spin_lock_irqsave(&cs->lock, flags);
 811         if (at_state->seq_index != seq_index) {
 812                 spin_unlock_irqrestore(&cs->lock, flags);
 813                 goto error;
 814         }
 815         spin_unlock_irqrestore(&cs->lock, flags);
 816
 817         for (i = 0; i < AT_NUM; ++i) {
 818                 kfree(bcs->commands[i]);
 819                 bcs->commands[i] = commands[i];
 820         }
 821
 822         at_state->pending_commands |= PC_CID;
 823         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 824         cs->commands_pending = 1;
 825         return;
 826
 827 error:
 828         for (i = 0; i < AT_NUM; ++i) {
 829                 kfree(commands[i]);
 830                 commands[i] = NULL;
 831         }
 832         at_state->pending_commands |= PC_NOCID;
 833         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 834         cs->commands_pending = 1;
 835         return;
 836 }
 837
 838 static void start_accept(struct at_state_t *at_state)
 839 {
 840         struct cardstate *cs = at_state->cs;
 841         struct bc_state *bcs = at_state->bcs;
 842         int i;
 843
 844         for (i = 0; i < AT_NUM; ++i) {
 845                 kfree(bcs->commands[i]);
 846                 bcs->commands[i] = NULL;
 847         }
 848
 849         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 850         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 851         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 852                 dev_err(at_state->cs->dev, "out of memory\n");
 853                 /* error reset */
 854                 at_state->pending_commands |= PC_HUP;
 855                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 856                 cs->commands_pending = 1;
 857                 return;
 858         }
 859
 860         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 861         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 862
 863         at_state->pending_commands |= PC_ACCEPT;
 864         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 865         cs->commands_pending = 1;
 866 }
 867
 868 static void do_start(struct cardstate *cs)
 869 {
 870         gigaset_free_channels(cs);
 871
 872         if (cs->mstate != MS_LOCKED)
 873                 schedule_init(cs, MS_INIT);
 874
 875         cs->isdn_up = 1;
 876         gigaset_isdn_start(cs);
 877
 878         cs->waiting = 0;
 879         wake_up(&cs->waitqueue);
 880 }
 881
 882 static void finish_shutdown(struct cardstate *cs)
 883 {
 884         if (cs->mstate != MS_LOCKED) {
 885                 cs->mstate = MS_UNINITIALIZED;
 886                 cs->mode = M_UNKNOWN;
 887         }
 888
 889         /* Tell the LL that the device is not available .. */
 890         if (cs->isdn_up) {
 891                 cs->isdn_up = 0;
 892                 gigaset_isdn_stop(cs);
 893         }
 894
 895         /* The rest is done by cleanup_cs () in user mode. */
 896
 897         cs->cmd_result = -ENODEV;
 898         cs->waiting = 0;
 899         wake_up(&cs->waitqueue);
 900 }
 901
 902 static void do_shutdown(struct cardstate *cs)
 903 {
 904         gigaset_block_channels(cs);
 905
 906         if (cs->mstate == MS_READY) {
 907                 cs->mstate = MS_SHUTDOWN;
 908                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 909                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 910                 cs->commands_pending = 1;
 911         } else
 912                 finish_shutdown(cs);
 913 }
 914
 915 static void do_stop(struct cardstate *cs)
 916 {
 917         unsigned long flags;
 918
 919         spin_lock_irqsave(&cs->lock, flags);
 920         cs->connected = 0;
 921         spin_unlock_irqrestore(&cs->lock, flags);
 922
 923         do_shutdown(cs);
 924 }
 925
 926 /* Entering cid mode or getting a cid failed:
 927  * try to initialize the device and try again.
 928  *
 929  * channel >= 0: getting cid for the channel failed
 930  * channel < 0:  entering cid mode failed
 931  *
 932  * returns 0 on failure
 933  */
 934 static int reinit_and_retry(struct cardstate *cs, int channel)
 935 {
 936         int i;
 937
 938         if (--cs->retry_count <= 0)
 939                 return 0;
 940
 941         for (i = 0; i < cs->channels; ++i)
 942                 if (cs->bcs[i].at_state.cid > 0)
 943                         return 0;
 944
 945         if (channel < 0)
 946                 dev_warn(cs->dev,
 947                     "Could not enter cid mode. Reinit device and try again.\n");
 948         else {
 949                 dev_warn(cs->dev,
 950                     "Could not get a call id. Reinit device and try again.\n");
 951                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 952         }
 953         schedule_init(cs, MS_INIT);
 954         return 1;
 955 }
 956
 957 static int at_state_invalid(struct cardstate *cs,
 958                             struct at_state_t *test_ptr)
 959 {
 960         unsigned long flags;
 961         unsigned channel;
 962         struct at_state_t *at_state;
 963         int retval = 0;
 964
 965         spin_lock_irqsave(&cs->lock, flags);
 966
 967         if (test_ptr == &cs->at_state)
 968                 goto exit;
 969
 970         list_for_each_entry(at_state, &cs->temp_at_states, list)
 971                 if (at_state == test_ptr)
 972                         goto exit;
 973
 974         for (channel = 0; channel < cs->channels; ++channel)
 975                 if (&cs->bcs[channel].at_state == test_ptr)
 976                         goto exit;
 977
 978         retval = 1;
 979 exit:
 980         spin_unlock_irqrestore(&cs->lock, flags);
 981         return retval;
 982 }
 983
 984 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
 985                          struct at_state_t **p_at_state)
 986 {
 987         int retval;
 988         struct at_state_t *at_state = *p_at_state;
 989
 990         retval = gigaset_isdn_icall(at_state);
 991         switch (retval) {
 992         case ICALL_ACCEPT:
 993                 break;
 994         default:
 995                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
 996                 /* --v-- fall through --v-- */
 997         case ICALL_IGNORE:
 998         case ICALL_REJECT:
 999                 /* hang up actively
1000                  * Device doc says that would reject the call.
1001                  * In fact it doesn't.
1002                  */
1003                 at_state->pending_commands |= PC_HUP;
1004                 cs->commands_pending = 1;
1005                 break;
1006         }
1007 }
1008
1009 static int do_lock(struct cardstate *cs)
1010 {
1011         int mode;
1012         int i;
1013
1014         switch (cs->mstate) {
1015         case MS_UNINITIALIZED:
1016         case MS_READY:
1017                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1018                     cs->at_state.pending_commands)
1019                         return -EBUSY;
1020
1021                 for (i = 0; i < cs->channels; ++i)
1022                         if (cs->bcs[i].at_state.pending_commands)
1023                                 return -EBUSY;
1024
1025                 if (!gigaset_get_channels(cs))
1026                         return -EBUSY;
1027
1028                 break;
1029         case MS_LOCKED:
1030                 break;
1031         default:
1032                 return -EBUSY;
1033         }
1034
1035         mode = cs->mode;
1036         cs->mstate = MS_LOCKED;
1037         cs->mode = M_UNKNOWN;
1038
1039         return mode;
1040 }
1041
1042 static int do_unlock(struct cardstate *cs)
1043 {
1044         if (cs->mstate != MS_LOCKED)
1045                 return -EINVAL;
1046
1047         cs->mstate = MS_UNINITIALIZED;
1048         cs->mode = M_UNKNOWN;
1049         gigaset_free_channels(cs);
1050         if (cs->connected)
1051                 schedule_init(cs, MS_INIT);
1052
1053         return 0;
1054 }
1055
1056 static void do_action(int action, struct cardstate *cs,
1057                       struct bc_state *bcs,
1058                       struct at_state_t **p_at_state, char **pp_command,
1059                       int *p_genresp, int *p_resp_code,
1060                       struct event_t *ev)
1061 {
1062         struct at_state_t *at_state = *p_at_state;
1063         struct at_state_t *at_state2;
1064         unsigned long flags;
1065
1066         int channel;
1067
1068         unsigned char *s, *e;
1069         int i;
1070         unsigned long val;
1071
1072         switch (action) {
1073         case ACT_NOTHING:
1074                 break;
1075         case ACT_TIMEOUT:
1076                 at_state->waiting = 1;
1077                 break;
1078         case ACT_INIT:
1079                 cs->at_state.pending_commands &= ~PC_INIT;
1080                 cs->cur_at_seq = SEQ_NONE;
1081                 cs->mode = M_UNIMODEM;
1082                 spin_lock_irqsave(&cs->lock, flags);
1083                 if (!cs->cidmode) {
1084                         spin_unlock_irqrestore(&cs->lock, flags);
1085                         gigaset_free_channels(cs);
1086                         cs->mstate = MS_READY;
1087                         break;
1088                 }
1089                 spin_unlock_irqrestore(&cs->lock, flags);
1090                 cs->at_state.pending_commands |= PC_CIDMODE;
1091                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1092                 cs->commands_pending = 1;
1093                 break;
1094         case ACT_FAILINIT:
1095                 dev_warn(cs->dev, "Could not initialize the device.\n");
1096                 cs->dle = 0;
1097                 init_failed(cs, M_UNKNOWN);
1098                 cs->cur_at_seq = SEQ_NONE;
1099                 break;
1100         case ACT_CONFIGMODE:
1101                 init_failed(cs, M_CONFIG);
1102                 cs->cur_at_seq = SEQ_NONE;
1103                 break;
1104         case ACT_SETDLE1:
1105                 cs->dle = 1;
1106                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1107                 cs->inbuf[0].inputstate &=
1108                         ~(INS_command | INS_DLE_command);
1109                 break;
1110         case ACT_SETDLE0:
1111                 cs->dle = 0;
1112                 cs->inbuf[0].inputstate =
1113                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1114                         | INS_command;
1115                 break;
1116         case ACT_CMODESET:
1117                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1118                         gigaset_free_channels(cs);
1119                         cs->mstate = MS_READY;
1120                 }
1121                 cs->mode = M_CID;
1122                 cs->cur_at_seq = SEQ_NONE;
1123                 break;
1124         case ACT_UMODESET:
1125                 cs->mode = M_UNIMODEM;
1126                 cs->cur_at_seq = SEQ_NONE;
1127                 break;
1128         case ACT_FAILCMODE:
1129                 cs->cur_at_seq = SEQ_NONE;
1130                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1131                         init_failed(cs, M_UNKNOWN);
1132                         break;
1133                 }
1134                 if (!reinit_and_retry(cs, -1))
1135                         schedule_init(cs, MS_RECOVER);
1136                 break;
1137         case ACT_FAILUMODE:
1138                 cs->cur_at_seq = SEQ_NONE;
1139                 schedule_init(cs, MS_RECOVER);
1140                 break;
1141         case ACT_HUPMODEM:
1142                 /* send "+++" (hangup in unimodem mode) */
1143                 if (cs->connected) {
1144                         struct cmdbuf_t *cb;
1145
1146                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1147                         if (!cb) {
1148                                 dev_err(cs->dev, "%s: out of memory\n",
1149                                         __func__);
1150                                 return;
1151                         }
1152                         memcpy(cb->buf, "+++", 3);
1153                         cb->len = 3;
1154                         cb->offset = 0;
1155                         cb->next = NULL;
1156                         cb->wake_tasklet = NULL;
1157                         cs->ops->write_cmd(cs, cb);
1158                 }
1159                 break;
1160         case ACT_RING:
1161                 /* get fresh AT state structure for new CID */
1162                 at_state2 = get_free_channel(cs, ev->parameter);
1163                 if (!at_state2) {
1164                         dev_warn(cs->dev,
1165                         "RING ignored: could not allocate channel structure\n");
1166                         break;
1167                 }
1168
1169                 /* initialize AT state structure
1170                  * note that bcs may be NULL if no B channel is free
1171                  */
1172                 at_state2->ConState = 700;
1173                 for (i = 0; i < STR_NUM; ++i) {
1174                         kfree(at_state2->str_var[i]);
1175                         at_state2->str_var[i] = NULL;
1176                 }
1177                 at_state2->int_var[VAR_ZCTP] = -1;
1178
1179                 spin_lock_irqsave(&cs->lock, flags);
1180                 at_state2->timer_expires = RING_TIMEOUT;
1181                 at_state2->timer_active = 1;
1182                 spin_unlock_irqrestore(&cs->lock, flags);
1183                 break;
1184         case ACT_ICALL:
1185                 handle_icall(cs, bcs, p_at_state);
1186                 break;
1187         case ACT_FAILSDOWN:
1188                 dev_warn(cs->dev, "Could not shut down the device.\n");
1189                 /* fall through */
1190         case ACT_FAKESDOWN:
1191         case ACT_SDOWN:
1192                 cs->cur_at_seq = SEQ_NONE;
1193                 finish_shutdown(cs);
1194                 break;
1195         case ACT_CONNECT:
1196                 if (cs->onechannel) {
1197                         at_state->pending_commands |= PC_DLE1;
1198                         cs->commands_pending = 1;
1199                         break;
1200                 }
1201                 bcs->chstate |= CHS_D_UP;
1202                 gigaset_isdn_connD(bcs);
1203                 cs->ops->init_bchannel(bcs);
1204                 break;
1205         case ACT_DLE1:
1206                 cs->cur_at_seq = SEQ_NONE;
1207                 bcs = cs->bcs + cs->curchannel;
1208
1209                 bcs->chstate |= CHS_D_UP;
1210                 gigaset_isdn_connD(bcs);
1211                 cs->ops->init_bchannel(bcs);
1212                 break;
1213         case ACT_FAKEHUP:
1214                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1215                 /* fall through */
1216         case ACT_DISCONNECT:
1217                 cs->cur_at_seq = SEQ_NONE;
1218                 at_state->cid = -1;
1219                 if (bcs && cs->onechannel && cs->dle) {
1220                         /* Check for other open channels not needed:
1221                          * DLE only used for M10x with one B channel.
1222                          */
1223                         at_state->pending_commands |= PC_DLE0;
1224                         cs->commands_pending = 1;
1225                 } else
1226                         disconnect(p_at_state);
1227                 break;
1228         case ACT_FAKEDLE0:
1229                 at_state->int_var[VAR_ZDLE] = 0;
1230                 cs->dle = 0;
1231                 /* fall through */
1232         case ACT_DLE0:
1233                 cs->cur_at_seq = SEQ_NONE;
1234                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1235                 disconnect(&at_state2);
1236                 break;
1237         case ACT_ABORTHUP:
1238                 cs->cur_at_seq = SEQ_NONE;
1239                 dev_warn(cs->dev, "Could not hang up.\n");
1240                 at_state->cid = -1;
1241                 if (bcs && cs->onechannel)
1242                         at_state->pending_commands |= PC_DLE0;
1243                 else
1244                         disconnect(p_at_state);
1245                 schedule_init(cs, MS_RECOVER);
1246                 break;
1247         case ACT_FAILDLE0:
1248                 cs->cur_at_seq = SEQ_NONE;
1249                 dev_warn(cs->dev, "Could not leave DLE mode.\n");
1250                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1251                 disconnect(&at_state2);
1252                 schedule_init(cs, MS_RECOVER);
1253                 break;
1254         case ACT_FAILDLE1:
1255                 cs->cur_at_seq = SEQ_NONE;
1256                 dev_warn(cs->dev,
1257                          "Could not enter DLE mode. Trying to hang up.\n");
1258                 channel = cs->curchannel;
1259                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1260                 cs->commands_pending = 1;
1261                 break;
1262
1263         case ACT_CID: /* got cid; start dialing */
1264                 cs->cur_at_seq = SEQ_NONE;
1265                 channel = cs->curchannel;
1266                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1267                         cs->bcs[channel].at_state.cid = ev->parameter;
1268                         cs->bcs[channel].at_state.pending_commands |=
1269                                 PC_DIAL;
1270                         cs->commands_pending = 1;
1271                         break;
1272                 }
1273                 /* fall through */
1274         case ACT_FAILCID:
1275                 cs->cur_at_seq = SEQ_NONE;
1276                 channel = cs->curchannel;
1277                 if (!reinit_and_retry(cs, channel)) {
1278                         dev_warn(cs->dev,
1279                                  "Could not get a call ID. Cannot dial.\n");
1280                         at_state2 = &cs->bcs[channel].at_state;
1281                         disconnect(&at_state2);
1282                 }
1283                 break;
1284         case ACT_ABORTCID:
1285                 cs->cur_at_seq = SEQ_NONE;
1286                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1287                 disconnect(&at_state2);
1288                 break;
1289
1290         case ACT_DIALING:
1291         case ACT_ACCEPTED:
1292                 cs->cur_at_seq = SEQ_NONE;
1293                 break;
1294
1295         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1296                 disconnect(p_at_state);
1297                 break;
1298
1299         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1300                 cs->cur_at_seq = SEQ_NONE;
1301                 at_state->pending_commands |= PC_HUP;
1302                 cs->commands_pending = 1;
1303                 break;
1304
1305         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1306         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1307         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1308                 at_state->pending_commands |= PC_HUP;
1309                 cs->commands_pending = 1;
1310                 break;
1311         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1312                                are not handled properly anymore */
1313                 at_state->getstring = 1;
1314                 break;
1315         case ACT_SETVER:
1316                 if (!ev->ptr) {
1317                         *p_genresp = 1;
1318                         *p_resp_code = RSP_ERROR;
1319                         break;
1320                 }
1321                 s = ev->ptr;
1322
1323                 if (!strcmp(s, "OK")) {
1324                         *p_genresp = 1;
1325                         *p_resp_code = RSP_ERROR;
1326                         break;
1327                 }
1328
1329                 for (i = 0; i < 4; ++i) {
1330                         val = simple_strtoul(s, (char **) &e, 10);
1331                         if (val > INT_MAX || e == s)
1332                                 break;
1333                         if (i == 3) {
1334                                 if (*e)
1335                                         break;
1336                         } else if (*e != '.')
1337                                 break;
1338                         else
1339                                 s = e + 1;
1340                         cs->fwver[i] = val;
1341                 }
1342                 if (i != 4) {
1343                         *p_genresp = 1;
1344                         *p_resp_code = RSP_ERROR;
1345                         break;
1346                 }
1347                 /*at_state->getstring = 1;*/
1348                 cs->gotfwver = 0;
1349                 break;
1350         case ACT_GOTVER:
1351                 if (cs->gotfwver == 0) {
1352                         cs->gotfwver = 1;
1353                         gig_dbg(DEBUG_EVENT,
1354                                 "firmware version %02d.%03d.%02d.%02d",
1355                                 cs->fwver[0], cs->fwver[1],
1356                                 cs->fwver[2], cs->fwver[3]);
1357                         break;
1358                 }
1359                 /* fall through */
1360         case ACT_FAILVER:
1361                 cs->gotfwver = -1;
1362                 dev_err(cs->dev, "could not read firmware version.\n");
1363                 break;
1364         case ACT_ERROR:
1365                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1366                         __func__, at_state->ConState);
1367                 cs->cur_at_seq = SEQ_NONE;
1368                 break;
1369         case ACT_DEBUG:
1370                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1371                         __func__, ev->type, at_state->ConState);
1372                 break;
1373         case ACT_WARN:
1374                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1375                          __func__, ev->type, at_state->ConState);
1376                 break;
1377         case ACT_ZCAU:
1378                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1379                          ev->parameter, at_state->ConState);
1380                 break;
1381
1382         /* events from the LL */
1383         case ACT_DIAL:
1384                 start_dial(at_state, ev->ptr, ev->parameter);
1385                 break;
1386         case ACT_ACCEPT:
1387                 start_accept(at_state);
1388                 break;
1389         case ACT_HUP:
1390                 at_state->pending_commands |= PC_HUP;
1391                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1392                 cs->commands_pending = 1;
1393                 break;
1394
1395         /* hotplug events */
1396         case ACT_STOP:
1397                 do_stop(cs);
1398                 break;
1399         case ACT_START:
1400                 do_start(cs);
1401                 break;
1402
1403         /* events from the interface */
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         case ACT_PROC_CIDMODE:
1424                 spin_lock_irqsave(&cs->lock, flags);
1425                 if (ev->parameter != cs->cidmode) {
1426                         cs->cidmode = ev->parameter;
1427                         if (ev->parameter) {
1428                                 cs->at_state.pending_commands |= PC_CIDMODE;
1429                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1430                         } else {
1431                                 cs->at_state.pending_commands |= PC_UMMODE;
1432                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1433                         }
1434                         cs->commands_pending = 1;
1435                 }
1436                 spin_unlock_irqrestore(&cs->lock, flags);
1437                 cs->waiting = 0;
1438                 wake_up(&cs->waitqueue);
1439                 break;
1440
1441         /* events from the hardware drivers */
1442         case ACT_NOTIFY_BC_DOWN:
1443                 bchannel_down(bcs);
1444                 break;
1445         case ACT_NOTIFY_BC_UP:
1446                 bchannel_up(bcs);
1447                 break;
1448         case ACT_SHUTDOWN:
1449                 do_shutdown(cs);
1450                 break;
1451
1452
1453         default:
1454                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1455                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1456                         if (!*pp_command) {
1457                                 *p_genresp = 1;
1458                                 *p_resp_code = RSP_NULL;
1459                         }
1460                 } else
1461                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1462         }
1463 }
1464
1465 /* State machine to do the calling and hangup procedure */
1466 static void process_event(struct cardstate *cs, struct event_t *ev)
1467 {
1468         struct bc_state *bcs;
1469         char *p_command = NULL;
1470         struct reply_t *rep;
1471         int rcode;
1472         int genresp = 0;
1473         int resp_code = RSP_ERROR;
1474         int sendcid;
1475         struct at_state_t *at_state;
1476         int index;
1477         int curact;
1478         unsigned long flags;
1479
1480         if (ev->cid >= 0) {
1481                 at_state = at_state_from_cid(cs, ev->cid);
1482                 if (!at_state) {
1483                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1484                                 ev->type, ev->cid);
1485                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1486                                           NULL, 0, NULL);
1487                         return;
1488                 }
1489         } else {
1490                 at_state = ev->at_state;
1491                 if (at_state_invalid(cs, at_state)) {
1492                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1493                                 at_state);
1494                         return;
1495                 }
1496         }
1497
1498         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1499                 at_state->ConState, ev->type);
1500
1501         bcs = at_state->bcs;
1502         sendcid = at_state->cid;
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 if (!at_state->waiting)
1514                         gig_dbg(DEBUG_EVENT, "timeout occurred");
1515                 else
1516                         gig_dbg(DEBUG_EVENT, "stopped waiting");
1517         }
1518         spin_unlock_irqrestore(&cs->lock, flags);
1519
1520         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1521            or at_state->str_var[STR_XXXX], set it */
1522         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1523                 index = ev->type - RSP_VAR;
1524                 at_state->int_var[index] = ev->parameter;
1525         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1526                 index = ev->type - RSP_STR;
1527                 kfree(at_state->str_var[index]);
1528                 at_state->str_var[index] = ev->ptr;
1529                 ev->ptr = NULL; /* prevent process_events() from
1530                                    deallocating ptr */
1531         }
1532
1533         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1534                 at_state->getstring = 0;
1535
1536         /* Search row in dial array which matches modem response and current
1537            constate */
1538         for (;; rep++) {
1539                 rcode = rep->resp_code;
1540                 if (rcode == RSP_LAST) {
1541                         /* found nothing...*/
1542                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1543                                         "resp_code %d in ConState %d!\n",
1544                                  __func__, ev->type, at_state->ConState);
1545                         return;
1546                 }
1547                 if ((rcode == RSP_ANY || rcode == ev->type)
1548                   && ((int) at_state->ConState >= rep->min_ConState)
1549                   && (rep->max_ConState < 0
1550                       || (int) at_state->ConState <= rep->max_ConState)
1551                   && (rep->parameter < 0 || rep->parameter == ev->parameter))
1552                         break;
1553         }
1554
1555         p_command = rep->command;
1556
1557         at_state->waiting = 0;
1558         for (curact = 0; curact < MAXACT; ++curact) {
1559                 /* The row tells us what we should do  ..
1560                  */
1561                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1562                           &genresp, &resp_code, ev);
1563                 if (!at_state)
1564                         break; /* may be freed after disconnect */
1565         }
1566
1567         if (at_state) {
1568                 /* Jump to the next con-state regarding the array */
1569                 if (rep->new_ConState >= 0)
1570                         at_state->ConState = rep->new_ConState;
1571
1572                 if (genresp) {
1573                         spin_lock_irqsave(&cs->lock, flags);
1574                         at_state->timer_expires = 0;
1575                         at_state->timer_active = 0;
1576                         spin_unlock_irqrestore(&cs->lock, flags);
1577                         gigaset_add_event(cs, at_state, resp_code,
1578                                           NULL, 0, NULL);
1579                 } else {
1580                         /* Send command to modem if not NULL... */
1581                         if (p_command) {
1582                                 if (cs->connected)
1583                                         send_command(cs, p_command,
1584                                                      sendcid, cs->dle,
1585                                                      GFP_ATOMIC);
1586                                 else
1587                                         gigaset_add_event(cs, at_state,
1588                                                           RSP_NODEV,
1589                                                           NULL, 0, NULL);
1590                         }
1591
1592                         spin_lock_irqsave(&cs->lock, flags);
1593                         if (!rep->timeout) {
1594                                 at_state->timer_expires = 0;
1595                                 at_state->timer_active = 0;
1596                         } else if (rep->timeout > 0) { /* new timeout */
1597                                 at_state->timer_expires = rep->timeout * 10;
1598                                 at_state->timer_active = 1;
1599                                 ++at_state->timer_index;
1600                         }
1601                         spin_unlock_irqrestore(&cs->lock, flags);
1602                 }
1603         }
1604 }
1605
1606 static void schedule_sequence(struct cardstate *cs,
1607                               struct at_state_t *at_state, int sequence)
1608 {
1609         cs->cur_at_seq = sequence;
1610         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1611 }
1612
1613 static void process_command_flags(struct cardstate *cs)
1614 {
1615         struct at_state_t *at_state = NULL;
1616         struct bc_state *bcs;
1617         int i;
1618         int sequence;
1619         unsigned long flags;
1620
1621         cs->commands_pending = 0;
1622
1623         if (cs->cur_at_seq) {
1624                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1625                 return;
1626         }
1627
1628         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1629
1630         sequence = SEQ_NONE;
1631
1632         /* clear pending_commands and hangup channels on shutdown */
1633         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1634                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1635                 for (i = 0; i < cs->channels; ++i) {
1636                         bcs = cs->bcs + i;
1637                         at_state = &bcs->at_state;
1638                         at_state->pending_commands &=
1639                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1640                         if (at_state->cid > 0)
1641                                 at_state->pending_commands |= PC_HUP;
1642                         if (at_state->pending_commands & PC_CID) {
1643                                 at_state->pending_commands |= PC_NOCID;
1644                                 at_state->pending_commands &= ~PC_CID;
1645                         }
1646                 }
1647         }
1648
1649         /* clear pending_commands and hangup channels on reset */
1650         if (cs->at_state.pending_commands & PC_INIT) {
1651                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1652                 for (i = 0; i < cs->channels; ++i) {
1653                         bcs = cs->bcs + i;
1654                         at_state = &bcs->at_state;
1655                         at_state->pending_commands &=
1656                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1657                         if (at_state->cid > 0)
1658                                 at_state->pending_commands |= PC_HUP;
1659                         if (cs->mstate == MS_RECOVER) {
1660                                 if (at_state->pending_commands & PC_CID) {
1661                                         at_state->pending_commands |= PC_NOCID;
1662                                         at_state->pending_commands &= ~PC_CID;
1663                                 }
1664                         }
1665                 }
1666         }
1667
1668         /* only switch back to unimodem mode if no commands are pending and
1669          * no channels are up */
1670         spin_lock_irqsave(&cs->lock, flags);
1671         if (cs->at_state.pending_commands == PC_UMMODE
1672             && !cs->cidmode
1673             && list_empty(&cs->temp_at_states)
1674             && cs->mode == M_CID) {
1675                 sequence = SEQ_UMMODE;
1676                 at_state = &cs->at_state;
1677                 for (i = 0; i < cs->channels; ++i) {
1678                         bcs = cs->bcs + i;
1679                         if (bcs->at_state.pending_commands ||
1680                             bcs->at_state.cid > 0) {
1681                                 sequence = SEQ_NONE;
1682                                 break;
1683                         }
1684                 }
1685         }
1686         spin_unlock_irqrestore(&cs->lock, flags);
1687         cs->at_state.pending_commands &= ~PC_UMMODE;
1688         if (sequence != SEQ_NONE) {
1689                 schedule_sequence(cs, at_state, sequence);
1690                 return;
1691         }
1692
1693         for (i = 0; i < cs->channels; ++i) {
1694                 bcs = cs->bcs + i;
1695                 if (bcs->at_state.pending_commands & PC_HUP) {
1696                         bcs->at_state.pending_commands &= ~PC_HUP;
1697                         if (bcs->at_state.pending_commands & PC_CID) {
1698                                 /* not yet dialing: PC_NOCID is sufficient */
1699                                 bcs->at_state.pending_commands |= PC_NOCID;
1700                                 bcs->at_state.pending_commands &= ~PC_CID;
1701                         } else {
1702                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1703                                 return;
1704                         }
1705                 }
1706                 if (bcs->at_state.pending_commands & PC_NOCID) {
1707                         bcs->at_state.pending_commands &= ~PC_NOCID;
1708                         cs->curchannel = bcs->channel;
1709                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1710                         return;
1711                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1712                         bcs->at_state.pending_commands &= ~PC_DLE0;
1713                         cs->curchannel = bcs->channel;
1714                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1715                         return;
1716                 }
1717         }
1718
1719         list_for_each_entry(at_state, &cs->temp_at_states, list)
1720                 if (at_state->pending_commands & PC_HUP) {
1721                         at_state->pending_commands &= ~PC_HUP;
1722                         schedule_sequence(cs, at_state, SEQ_HUP);
1723                         return;
1724                 }
1725
1726         if (cs->at_state.pending_commands & PC_INIT) {
1727                 cs->at_state.pending_commands &= ~PC_INIT;
1728                 cs->dle = 0;
1729                 cs->inbuf->inputstate = INS_command;
1730                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1731                 return;
1732         }
1733         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1734                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1735                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1736                 return;
1737         }
1738         if (cs->at_state.pending_commands & PC_CIDMODE) {
1739                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1740                 if (cs->mode == M_UNIMODEM) {
1741                         cs->retry_count = 1;
1742                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1743                         return;
1744                 }
1745         }
1746
1747         for (i = 0; i < cs->channels; ++i) {
1748                 bcs = cs->bcs + i;
1749                 if (bcs->at_state.pending_commands & PC_DLE1) {
1750                         bcs->at_state.pending_commands &= ~PC_DLE1;
1751                         cs->curchannel = bcs->channel;
1752                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1753                         return;
1754                 }
1755                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1756                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1757                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1758                         return;
1759                 }
1760                 if (bcs->at_state.pending_commands & PC_DIAL) {
1761                         bcs->at_state.pending_commands &= ~PC_DIAL;
1762                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1763                         return;
1764                 }
1765                 if (bcs->at_state.pending_commands & PC_CID) {
1766                         switch (cs->mode) {
1767                         case M_UNIMODEM:
1768                                 cs->at_state.pending_commands |= PC_CIDMODE;
1769                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1770                                 cs->commands_pending = 1;
1771                                 return;
1772                         case M_UNKNOWN:
1773                                 schedule_init(cs, MS_INIT);
1774                                 return;
1775                         }
1776                         bcs->at_state.pending_commands &= ~PC_CID;
1777                         cs->curchannel = bcs->channel;
1778                         cs->retry_count = 2;
1779                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1780                         return;
1781                 }
1782         }
1783 }
1784
1785 static void process_events(struct cardstate *cs)
1786 {
1787         struct event_t *ev;
1788         unsigned head, tail;
1789         int i;
1790         int check_flags = 0;
1791         int was_busy;
1792         unsigned long flags;
1793
1794         spin_lock_irqsave(&cs->ev_lock, flags);
1795         head = cs->ev_head;
1796
1797         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1798                 tail = cs->ev_tail;
1799                 if (tail == head) {
1800                         if (!check_flags && !cs->commands_pending)
1801                                 break;
1802                         check_flags = 0;
1803                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1804                         process_command_flags(cs);
1805                         spin_lock_irqsave(&cs->ev_lock, flags);
1806                         tail = cs->ev_tail;
1807                         if (tail == head) {
1808                                 if (!cs->commands_pending)
1809                                         break;
1810                                 continue;
1811                         }
1812                 }
1813
1814                 ev = cs->events + head;
1815                 was_busy = cs->cur_at_seq != SEQ_NONE;
1816                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1817                 process_event(cs, ev);
1818                 spin_lock_irqsave(&cs->ev_lock, flags);
1819                 kfree(ev->ptr);
1820                 ev->ptr = NULL;
1821                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1822                         check_flags = 1;
1823
1824                 head = (head + 1) % MAX_EVENTS;
1825                 cs->ev_head = head;
1826         }
1827
1828         spin_unlock_irqrestore(&cs->ev_lock, flags);
1829
1830         if (i == 2 * MAX_EVENTS) {
1831                 dev_err(cs->dev,
1832                         "infinite loop in process_events; aborting.\n");
1833         }
1834 }
1835
1836 /* tasklet scheduled on any event received from the Gigaset device
1837  * parameter:
1838  *      data    ISDN controller state structure
1839  */
1840 void gigaset_handle_event(unsigned long data)
1841 {
1842         struct cardstate *cs = (struct cardstate *) data;
1843
1844         /* handle incoming data on control/common channel */
1845         if (cs->inbuf->head != cs->inbuf->tail) {
1846                 gig_dbg(DEBUG_INTR, "processing new data");
1847                 cs->ops->handle_input(cs->inbuf);
1848         }
1849
1850         process_events(cs);
1851 }