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         unsigned char   *response;
 355         int             resp_code;
 356         int             type;
 357 } resp_type[] =
 358 {
 359         {"OK",          RSP_OK,         RT_NOTHING},
 360         {"ERROR",       RSP_ERROR,      RT_NOTHING},
 361         {"ZSAU",        RSP_ZSAU,       RT_ZSAU},
 362         {"ZCAU",        RSP_ZCAU,       RT_ZCAU},
 363         {"RING",        RSP_RING,       RT_RING},
 364         {"ZGCI",        RSP_ZGCI,       RT_NUMBER},
 365         {"ZVLS",        RSP_ZVLS,       RT_NUMBER},
 366         {"ZCTP",        RSP_ZCTP,       RT_NUMBER},
 367         {"ZDLE",        RSP_ZDLE,       RT_NUMBER},
 368         {"ZHLC",        RSP_ZHLC,       RT_STRING},
 369         {"ZBC",         RSP_ZBC,        RT_STRING},
 370         {"NMBR",        RSP_NMBR,       RT_STRING},
 371         {"ZCPN",        RSP_ZCPN,       RT_STRING},
 372         {"ZCON",        RSP_ZCON,       RT_STRING},
 373         {NULL,          0,              0}
 374 };
 375
 376 static const struct zsau_resp_t {
 377         unsigned char   *str;
 378         int             code;
 379 } zsau_resp[] =
 380 {
 381         {"OUTGOING_CALL_PROCEEDING",    ZSAU_OUTGOING_CALL_PROCEEDING},
 382         {"CALL_DELIVERED",              ZSAU_CALL_DELIVERED},
 383         {"ACTIVE",                      ZSAU_ACTIVE},
 384         {"DISCONNECT_IND",              ZSAU_DISCONNECT_IND},
 385         {"NULL",                        ZSAU_NULL},
 386         {"DISCONNECT_REQ",              ZSAU_DISCONNECT_REQ},
 387         {NULL,                          ZSAU_UNKNOWN}
 388 };
 389
 390 /* retrieve CID from parsed response
 391  * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
 392  */
 393 static int cid_of_response(char *s)
 394 {
 395         int cid;
 396         int rc;
 397
 398         if (s[-1] != ';')
 399                 return 0;       /* no CID separator */
 400         rc = kstrtoint(s, 10, &cid);
 401         if (rc)
 402                 return 0;       /* CID not numeric */
 403         if (cid < 1 || cid > 65535)
 404                 return -1;      /* CID out of range */
 405         return cid;
 406 }
 407
 408 /**
 409  * gigaset_handle_modem_response() - process received modem response
 410  * @cs:         device descriptor structure.
 411  *
 412  * Called by asyncdata/isocdata if a block of data received from the
 413  * device must be processed as a modem command response. The data is
 414  * already in the cs structure.
 415  */
 416 void gigaset_handle_modem_response(struct cardstate *cs)
 417 {
 418         unsigned char *argv[MAX_REC_PARAMS + 1];
 419         int params;
 420         int i, j;
 421         const struct resp_type_t *rt;
 422         const struct zsau_resp_t *zr;
 423         int curarg;
 424         unsigned long flags;
 425         unsigned next, tail, head;
 426         struct event_t *event;
 427         int resp_code;
 428         int param_type;
 429         int abort;
 430         size_t len;
 431         int cid;
 432         int rawstring;
 433
 434         len = cs->cbytes;
 435         if (!len) {
 436                 /* ignore additional LFs/CRs (M10x config mode or cx100) */
 437                 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[len]);
 438                 return;
 439         }
 440         cs->respdata[len] = 0;
 441         argv[0] = cs->respdata;
 442         params = 1;
 443         if (cs->at_state.getstring) {
 444                 /* getstring only allowed without cid at the moment */
 445                 cs->at_state.getstring = 0;
 446                 rawstring = 1;
 447                 cid = 0;
 448         } else {
 449                 /* parse line */
 450                 for (i = 0; i < len; i++)
 451                         switch (cs->respdata[i]) {
 452                         case ';':
 453                         case ',':
 454                         case '=':
 455                                 if (params > MAX_REC_PARAMS) {
 456                                         dev_warn(cs->dev,
 457                                            "too many parameters in response\n");
 458                                         /* need last parameter (might be CID) */
 459                                         params--;
 460                                 }
 461                                 argv[params++] = cs->respdata + i + 1;
 462                         }
 463
 464                 rawstring = 0;
 465                 cid = params > 1 ? cid_of_response(argv[params-1]) : 0;
 466                 if (cid < 0) {
 467                         gigaset_add_event(cs, &cs->at_state, RSP_INVAL,
 468                                           NULL, 0, NULL);
 469                         return;
 470                 }
 471
 472                 for (j = 1; j < params; ++j)
 473                         argv[j][-1] = 0;
 474
 475                 gig_dbg(DEBUG_EVENT, "CMD received: %s", argv[0]);
 476                 if (cid) {
 477                         --params;
 478                         gig_dbg(DEBUG_EVENT, "CID: %s", argv[params]);
 479                 }
 480                 gig_dbg(DEBUG_EVENT, "available params: %d", params - 1);
 481                 for (j = 1; j < params; j++)
 482                         gig_dbg(DEBUG_EVENT, "param %d: %s", j, argv[j]);
 483         }
 484
 485         spin_lock_irqsave(&cs->ev_lock, flags);
 486         head = cs->ev_head;
 487         tail = cs->ev_tail;
 488
 489         abort = 1;
 490         curarg = 0;
 491         while (curarg < params) {
 492                 next = (tail + 1) % MAX_EVENTS;
 493                 if (unlikely(next == head)) {
 494                         dev_err(cs->dev, "event queue full\n");
 495                         break;
 496                 }
 497
 498                 event = cs->events + tail;
 499                 event->at_state = NULL;
 500                 event->cid = cid;
 501                 event->ptr = NULL;
 502                 event->arg = NULL;
 503                 tail = next;
 504
 505                 if (rawstring) {
 506                         resp_code = RSP_STRING;
 507                         param_type = RT_STRING;
 508                 } else {
 509                         for (rt = resp_type; rt->response; ++rt)
 510                                 if (!strcmp(argv[curarg], rt->response))
 511                                         break;
 512
 513                         if (!rt->response) {
 514                                 event->type = RSP_NONE;
 515                                 gig_dbg(DEBUG_EVENT,
 516                                         "unknown modem response: '%s'\n",
 517                                         argv[curarg]);
 518                                 break;
 519                         }
 520
 521                         resp_code = rt->resp_code;
 522                         param_type = rt->type;
 523                         ++curarg;
 524                 }
 525
 526                 event->type = resp_code;
 527
 528                 switch (param_type) {
 529                 case RT_NOTHING:
 530                         break;
 531                 case RT_RING:
 532                         if (!cid) {
 533                                 dev_err(cs->dev,
 534                                         "received RING without CID!\n");
 535                                 event->type = RSP_INVAL;
 536                                 abort = 1;
 537                         } else {
 538                                 event->cid = 0;
 539                                 event->parameter = cid;
 540                                 abort = 0;
 541                         }
 542                         break;
 543                 case RT_ZSAU:
 544                         if (curarg >= params) {
 545                                 event->parameter = ZSAU_NONE;
 546                                 break;
 547                         }
 548                         for (zr = zsau_resp; zr->str; ++zr)
 549                                 if (!strcmp(argv[curarg], zr->str))
 550                                         break;
 551                         event->parameter = zr->code;
 552                         if (!zr->str)
 553                                 dev_warn(cs->dev,
 554                                         "%s: unknown parameter %s after ZSAU\n",
 555                                          __func__, argv[curarg]);
 556                         ++curarg;
 557                         break;
 558                 case RT_STRING:
 559                         if (curarg < params) {
 560                                 event->ptr = kstrdup(argv[curarg], GFP_ATOMIC);
 561                                 if (!event->ptr)
 562                                         dev_err(cs->dev, "out of memory\n");
 563                                 ++curarg;
 564                         }
 565                         gig_dbg(DEBUG_EVENT, "string==%s",
 566                                 event->ptr ? (char *) event->ptr : "NULL");
 567                         break;
 568                 case RT_ZCAU:
 569                         event->parameter = -1;
 570                         if (curarg + 1 < params) {
 571                                 u8 type, value;
 572
 573                                 i = kstrtou8(argv[curarg++], 16, &type);
 574                                 j = kstrtou8(argv[curarg++], 16, &value);
 575                                 if (i == 0 && j == 0)
 576                                         event->parameter = (type << 8) | value;
 577                         } else
 578                                 curarg = params - 1;
 579                         break;
 580                 case RT_NUMBER:
 581                         if (curarg >= params ||
 582                             kstrtoint(argv[curarg++], 10, &event->parameter))
 583                                 event->parameter = -1;
 584                         gig_dbg(DEBUG_EVENT, "parameter==%d", event->parameter);
 585                         break;
 586                 }
 587
 588                 if (resp_code == RSP_ZDLE)
 589                         cs->dle = event->parameter;
 590
 591                 if (abort)
 592                         break;
 593         }
 594
 595         cs->ev_tail = tail;
 596         spin_unlock_irqrestore(&cs->ev_lock, flags);
 597
 598         if (curarg != params)
 599                 gig_dbg(DEBUG_EVENT,
 600                         "invalid number of processed parameters: %d/%d",
 601                         curarg, params);
 602 }
 603 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
 604
 605 /* disconnect
 606  * process closing of connection associated with given AT state structure
 607  */
 608 static void disconnect(struct at_state_t **at_state_p)
 609 {
 610         unsigned long flags;
 611         struct bc_state *bcs = (*at_state_p)->bcs;
 612         struct cardstate *cs = (*at_state_p)->cs;
 613
 614         spin_lock_irqsave(&cs->lock, flags);
 615         ++(*at_state_p)->seq_index;
 616
 617         /* revert to selected idle mode */
 618         if (!cs->cidmode) {
 619                 cs->at_state.pending_commands |= PC_UMMODE;
 620                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
 621                 cs->commands_pending = 1;
 622         }
 623         spin_unlock_irqrestore(&cs->lock, flags);
 624
 625         if (bcs) {
 626                 /* B channel assigned: invoke hardware specific handler */
 627                 cs->ops->close_bchannel(bcs);
 628                 /* notify LL */
 629                 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 630                         bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 631                         gigaset_isdn_hupD(bcs);
 632                 }
 633         } else {
 634                 /* no B channel assigned: just deallocate */
 635                 spin_lock_irqsave(&cs->lock, flags);
 636                 list_del(&(*at_state_p)->list);
 637                 kfree(*at_state_p);
 638                 *at_state_p = NULL;
 639                 spin_unlock_irqrestore(&cs->lock, flags);
 640         }
 641 }
 642
 643 /* get_free_channel
 644  * get a free AT state structure: either one of those associated with the
 645  * B channels of the Gigaset device, or if none of those is available,
 646  * a newly allocated one with bcs=NULL
 647  * The structure should be freed by calling disconnect() after use.
 648  */
 649 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
 650                                                   int cid)
 651 /* cids: >0: siemens-cid
 652           0: without cid
 653          -1: no cid assigned yet
 654 */
 655 {
 656         unsigned long flags;
 657         int i;
 658         struct at_state_t *ret;
 659
 660         for (i = 0; i < cs->channels; ++i)
 661                 if (gigaset_get_channel(cs->bcs + i)) {
 662                         ret = &cs->bcs[i].at_state;
 663                         ret->cid = cid;
 664                         return ret;
 665                 }
 666
 667         spin_lock_irqsave(&cs->lock, flags);
 668         ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
 669         if (ret) {
 670                 gigaset_at_init(ret, NULL, cs, cid);
 671                 list_add(&ret->list, &cs->temp_at_states);
 672         }
 673         spin_unlock_irqrestore(&cs->lock, flags);
 674         return ret;
 675 }
 676
 677 static void init_failed(struct cardstate *cs, int mode)
 678 {
 679         int i;
 680         struct at_state_t *at_state;
 681
 682         cs->at_state.pending_commands &= ~PC_INIT;
 683         cs->mode = mode;
 684         cs->mstate = MS_UNINITIALIZED;
 685         gigaset_free_channels(cs);
 686         for (i = 0; i < cs->channels; ++i) {
 687                 at_state = &cs->bcs[i].at_state;
 688                 if (at_state->pending_commands & PC_CID) {
 689                         at_state->pending_commands &= ~PC_CID;
 690                         at_state->pending_commands |= PC_NOCID;
 691                         cs->commands_pending = 1;
 692                 }
 693         }
 694 }
 695
 696 static void schedule_init(struct cardstate *cs, int state)
 697 {
 698         if (cs->at_state.pending_commands & PC_INIT) {
 699                 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
 700                 return;
 701         }
 702         cs->mstate = state;
 703         cs->mode = M_UNKNOWN;
 704         gigaset_block_channels(cs);
 705         cs->at_state.pending_commands |= PC_INIT;
 706         gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
 707         cs->commands_pending = 1;
 708 }
 709
 710 /* Add "AT" to a command, add the cid, dle encode it, send the result to the
 711    hardware. */
 712 static void send_command(struct cardstate *cs, const char *cmd, int cid,
 713                          int dle, gfp_t kmallocflags)
 714 {
 715         struct cmdbuf_t *cb;
 716         size_t buflen;
 717
 718         buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
 719         cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, kmallocflags);
 720         if (!cb) {
 721                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 722                 return;
 723         }
 724         if (cid > 0 && cid <= 65535)
 725                 cb->len = snprintf(cb->buf, buflen,
 726                                   dle ? "\020(AT%d%s\020)" : "AT%d%s",
 727                                   cid, cmd);
 728         else
 729                 cb->len = snprintf(cb->buf, buflen,
 730                                   dle ? "\020(AT%s\020)" : "AT%s",
 731                                   cmd);
 732         cb->offset = 0;
 733         cb->next = NULL;
 734         cb->wake_tasklet = NULL;
 735         cs->ops->write_cmd(cs, cb);
 736 }
 737
 738 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
 739 {
 740         struct at_state_t *at_state;
 741         int i;
 742         unsigned long flags;
 743
 744         if (cid == 0)
 745                 return &cs->at_state;
 746
 747         for (i = 0; i < cs->channels; ++i)
 748                 if (cid == cs->bcs[i].at_state.cid)
 749                         return &cs->bcs[i].at_state;
 750
 751         spin_lock_irqsave(&cs->lock, flags);
 752
 753         list_for_each_entry(at_state, &cs->temp_at_states, list)
 754                 if (cid == at_state->cid) {
 755                         spin_unlock_irqrestore(&cs->lock, flags);
 756                         return at_state;
 757                 }
 758
 759         spin_unlock_irqrestore(&cs->lock, flags);
 760
 761         return NULL;
 762 }
 763
 764 static void bchannel_down(struct bc_state *bcs)
 765 {
 766         if (bcs->chstate & CHS_B_UP) {
 767                 bcs->chstate &= ~CHS_B_UP;
 768                 gigaset_isdn_hupB(bcs);
 769         }
 770
 771         if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
 772                 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
 773                 gigaset_isdn_hupD(bcs);
 774         }
 775
 776         gigaset_free_channel(bcs);
 777
 778         gigaset_bcs_reinit(bcs);
 779 }
 780
 781 static void bchannel_up(struct bc_state *bcs)
 782 {
 783         if (bcs->chstate & CHS_B_UP) {
 784                 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
 785                            __func__);
 786                 return;
 787         }
 788
 789         bcs->chstate |= CHS_B_UP;
 790         gigaset_isdn_connB(bcs);
 791 }
 792
 793 static void start_dial(struct at_state_t *at_state, void *data,
 794                         unsigned seq_index)
 795 {
 796         struct bc_state *bcs = at_state->bcs;
 797         struct cardstate *cs = at_state->cs;
 798         char **commands = data;
 799         unsigned long flags;
 800         int i;
 801
 802         bcs->chstate |= CHS_NOTIFY_LL;
 803
 804         spin_lock_irqsave(&cs->lock, flags);
 805         if (at_state->seq_index != seq_index) {
 806                 spin_unlock_irqrestore(&cs->lock, flags);
 807                 goto error;
 808         }
 809         spin_unlock_irqrestore(&cs->lock, flags);
 810
 811         for (i = 0; i < AT_NUM; ++i) {
 812                 kfree(bcs->commands[i]);
 813                 bcs->commands[i] = commands[i];
 814         }
 815
 816         at_state->pending_commands |= PC_CID;
 817         gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
 818         cs->commands_pending = 1;
 819         return;
 820
 821 error:
 822         for (i = 0; i < AT_NUM; ++i) {
 823                 kfree(commands[i]);
 824                 commands[i] = NULL;
 825         }
 826         at_state->pending_commands |= PC_NOCID;
 827         gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
 828         cs->commands_pending = 1;
 829         return;
 830 }
 831
 832 static void start_accept(struct at_state_t *at_state)
 833 {
 834         struct cardstate *cs = at_state->cs;
 835         struct bc_state *bcs = at_state->bcs;
 836         int i;
 837
 838         for (i = 0; i < AT_NUM; ++i) {
 839                 kfree(bcs->commands[i]);
 840                 bcs->commands[i] = NULL;
 841         }
 842
 843         bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
 844         bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
 845         if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
 846                 dev_err(at_state->cs->dev, "out of memory\n");
 847                 /* error reset */
 848                 at_state->pending_commands |= PC_HUP;
 849                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
 850                 cs->commands_pending = 1;
 851                 return;
 852         }
 853
 854         snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
 855         snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
 856
 857         at_state->pending_commands |= PC_ACCEPT;
 858         gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
 859         cs->commands_pending = 1;
 860 }
 861
 862 static void do_start(struct cardstate *cs)
 863 {
 864         gigaset_free_channels(cs);
 865
 866         if (cs->mstate != MS_LOCKED)
 867                 schedule_init(cs, MS_INIT);
 868
 869         cs->isdn_up = 1;
 870         gigaset_isdn_start(cs);
 871
 872         cs->waiting = 0;
 873         wake_up(&cs->waitqueue);
 874 }
 875
 876 static void finish_shutdown(struct cardstate *cs)
 877 {
 878         if (cs->mstate != MS_LOCKED) {
 879                 cs->mstate = MS_UNINITIALIZED;
 880                 cs->mode = M_UNKNOWN;
 881         }
 882
 883         /* Tell the LL that the device is not available .. */
 884         if (cs->isdn_up) {
 885                 cs->isdn_up = 0;
 886                 gigaset_isdn_stop(cs);
 887         }
 888
 889         /* The rest is done by cleanup_cs () in user mode. */
 890
 891         cs->cmd_result = -ENODEV;
 892         cs->waiting = 0;
 893         wake_up(&cs->waitqueue);
 894 }
 895
 896 static void do_shutdown(struct cardstate *cs)
 897 {
 898         gigaset_block_channels(cs);
 899
 900         if (cs->mstate == MS_READY) {
 901                 cs->mstate = MS_SHUTDOWN;
 902                 cs->at_state.pending_commands |= PC_SHUTDOWN;
 903                 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
 904                 cs->commands_pending = 1;
 905         } else
 906                 finish_shutdown(cs);
 907 }
 908
 909 static void do_stop(struct cardstate *cs)
 910 {
 911         unsigned long flags;
 912
 913         spin_lock_irqsave(&cs->lock, flags);
 914         cs->connected = 0;
 915         spin_unlock_irqrestore(&cs->lock, flags);
 916
 917         do_shutdown(cs);
 918 }
 919
 920 /* Entering cid mode or getting a cid failed:
 921  * try to initialize the device and try again.
 922  *
 923  * channel >= 0: getting cid for the channel failed
 924  * channel < 0:  entering cid mode failed
 925  *
 926  * returns 0 on failure
 927  */
 928 static int reinit_and_retry(struct cardstate *cs, int channel)
 929 {
 930         int i;
 931
 932         if (--cs->retry_count <= 0)
 933                 return 0;
 934
 935         for (i = 0; i < cs->channels; ++i)
 936                 if (cs->bcs[i].at_state.cid > 0)
 937                         return 0;
 938
 939         if (channel < 0)
 940                 dev_warn(cs->dev,
 941                     "Could not enter cid mode. Reinit device and try again.\n");
 942         else {
 943                 dev_warn(cs->dev,
 944                     "Could not get a call id. Reinit device and try again.\n");
 945                 cs->bcs[channel].at_state.pending_commands |= PC_CID;
 946         }
 947         schedule_init(cs, MS_INIT);
 948         return 1;
 949 }
 950
 951 static int at_state_invalid(struct cardstate *cs,
 952                             struct at_state_t *test_ptr)
 953 {
 954         unsigned long flags;
 955         unsigned channel;
 956         struct at_state_t *at_state;
 957         int retval = 0;
 958
 959         spin_lock_irqsave(&cs->lock, flags);
 960
 961         if (test_ptr == &cs->at_state)
 962                 goto exit;
 963
 964         list_for_each_entry(at_state, &cs->temp_at_states, list)
 965                 if (at_state == test_ptr)
 966                         goto exit;
 967
 968         for (channel = 0; channel < cs->channels; ++channel)
 969                 if (&cs->bcs[channel].at_state == test_ptr)
 970                         goto exit;
 971
 972         retval = 1;
 973 exit:
 974         spin_unlock_irqrestore(&cs->lock, flags);
 975         return retval;
 976 }
 977
 978 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
 979                          struct at_state_t **p_at_state)
 980 {
 981         int retval;
 982         struct at_state_t *at_state = *p_at_state;
 983
 984         retval = gigaset_isdn_icall(at_state);
 985         switch (retval) {
 986         case ICALL_ACCEPT:
 987                 break;
 988         default:
 989                 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
 990                 /* --v-- fall through --v-- */
 991         case ICALL_IGNORE:
 992         case ICALL_REJECT:
 993                 /* hang up actively
 994                  * Device doc says that would reject the call.
 995                  * In fact it doesn't.
 996                  */
 997                 at_state->pending_commands |= PC_HUP;
 998                 cs->commands_pending = 1;
 999                 break;
1000         }
1001 }
1002
1003 static int do_lock(struct cardstate *cs)
1004 {
1005         int mode;
1006         int i;
1007
1008         switch (cs->mstate) {
1009         case MS_UNINITIALIZED:
1010         case MS_READY:
1011                 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1012                     cs->at_state.pending_commands)
1013                         return -EBUSY;
1014
1015                 for (i = 0; i < cs->channels; ++i)
1016                         if (cs->bcs[i].at_state.pending_commands)
1017                                 return -EBUSY;
1018
1019                 if (!gigaset_get_channels(cs))
1020                         return -EBUSY;
1021
1022                 break;
1023         case MS_LOCKED:
1024                 break;
1025         default:
1026                 return -EBUSY;
1027         }
1028
1029         mode = cs->mode;
1030         cs->mstate = MS_LOCKED;
1031         cs->mode = M_UNKNOWN;
1032
1033         return mode;
1034 }
1035
1036 static int do_unlock(struct cardstate *cs)
1037 {
1038         if (cs->mstate != MS_LOCKED)
1039                 return -EINVAL;
1040
1041         cs->mstate = MS_UNINITIALIZED;
1042         cs->mode = M_UNKNOWN;
1043         gigaset_free_channels(cs);
1044         if (cs->connected)
1045                 schedule_init(cs, MS_INIT);
1046
1047         return 0;
1048 }
1049
1050 static void do_action(int action, struct cardstate *cs,
1051                       struct bc_state *bcs,
1052                       struct at_state_t **p_at_state, char **pp_command,
1053                       int *p_genresp, int *p_resp_code,
1054                       struct event_t *ev)
1055 {
1056         struct at_state_t *at_state = *p_at_state;
1057         struct at_state_t *at_state2;
1058         unsigned long flags;
1059
1060         int channel;
1061
1062         unsigned char *s, *e;
1063         int i;
1064         unsigned long val;
1065
1066         switch (action) {
1067         case ACT_NOTHING:
1068                 break;
1069         case ACT_TIMEOUT:
1070                 at_state->waiting = 1;
1071                 break;
1072         case ACT_INIT:
1073                 cs->at_state.pending_commands &= ~PC_INIT;
1074                 cs->cur_at_seq = SEQ_NONE;
1075                 cs->mode = M_UNIMODEM;
1076                 spin_lock_irqsave(&cs->lock, flags);
1077                 if (!cs->cidmode) {
1078                         spin_unlock_irqrestore(&cs->lock, flags);
1079                         gigaset_free_channels(cs);
1080                         cs->mstate = MS_READY;
1081                         break;
1082                 }
1083                 spin_unlock_irqrestore(&cs->lock, flags);
1084                 cs->at_state.pending_commands |= PC_CIDMODE;
1085                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1086                 cs->commands_pending = 1;
1087                 break;
1088         case ACT_FAILINIT:
1089                 dev_warn(cs->dev, "Could not initialize the device.\n");
1090                 cs->dle = 0;
1091                 init_failed(cs, M_UNKNOWN);
1092                 cs->cur_at_seq = SEQ_NONE;
1093                 break;
1094         case ACT_CONFIGMODE:
1095                 init_failed(cs, M_CONFIG);
1096                 cs->cur_at_seq = SEQ_NONE;
1097                 break;
1098         case ACT_SETDLE1:
1099                 cs->dle = 1;
1100                 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1101                 cs->inbuf[0].inputstate &=
1102                         ~(INS_command | INS_DLE_command);
1103                 break;
1104         case ACT_SETDLE0:
1105                 cs->dle = 0;
1106                 cs->inbuf[0].inputstate =
1107                         (cs->inbuf[0].inputstate & ~INS_DLE_command)
1108                         | INS_command;
1109                 break;
1110         case ACT_CMODESET:
1111                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1112                         gigaset_free_channels(cs);
1113                         cs->mstate = MS_READY;
1114                 }
1115                 cs->mode = M_CID;
1116                 cs->cur_at_seq = SEQ_NONE;
1117                 break;
1118         case ACT_UMODESET:
1119                 cs->mode = M_UNIMODEM;
1120                 cs->cur_at_seq = SEQ_NONE;
1121                 break;
1122         case ACT_FAILCMODE:
1123                 cs->cur_at_seq = SEQ_NONE;
1124                 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1125                         init_failed(cs, M_UNKNOWN);
1126                         break;
1127                 }
1128                 if (!reinit_and_retry(cs, -1))
1129                         schedule_init(cs, MS_RECOVER);
1130                 break;
1131         case ACT_FAILUMODE:
1132                 cs->cur_at_seq = SEQ_NONE;
1133                 schedule_init(cs, MS_RECOVER);
1134                 break;
1135         case ACT_HUPMODEM:
1136                 /* send "+++" (hangup in unimodem mode) */
1137                 if (cs->connected) {
1138                         struct cmdbuf_t *cb;
1139
1140                         cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1141                         if (!cb) {
1142                                 dev_err(cs->dev, "%s: out of memory\n",
1143                                         __func__);
1144                                 return;
1145                         }
1146                         memcpy(cb->buf, "+++", 3);
1147                         cb->len = 3;
1148                         cb->offset = 0;
1149                         cb->next = NULL;
1150                         cb->wake_tasklet = NULL;
1151                         cs->ops->write_cmd(cs, cb);
1152                 }
1153                 break;
1154         case ACT_RING:
1155                 /* get fresh AT state structure for new CID */
1156                 at_state2 = get_free_channel(cs, ev->parameter);
1157                 if (!at_state2) {
1158                         dev_warn(cs->dev,
1159                         "RING ignored: could not allocate channel structure\n");
1160                         break;
1161                 }
1162
1163                 /* initialize AT state structure
1164                  * note that bcs may be NULL if no B channel is free
1165                  */
1166                 at_state2->ConState = 700;
1167                 for (i = 0; i < STR_NUM; ++i) {
1168                         kfree(at_state2->str_var[i]);
1169                         at_state2->str_var[i] = NULL;
1170                 }
1171                 at_state2->int_var[VAR_ZCTP] = -1;
1172
1173                 spin_lock_irqsave(&cs->lock, flags);
1174                 at_state2->timer_expires = RING_TIMEOUT;
1175                 at_state2->timer_active = 1;
1176                 spin_unlock_irqrestore(&cs->lock, flags);
1177                 break;
1178         case ACT_ICALL:
1179                 handle_icall(cs, bcs, p_at_state);
1180                 break;
1181         case ACT_FAILSDOWN:
1182                 dev_warn(cs->dev, "Could not shut down the device.\n");
1183                 /* fall through */
1184         case ACT_FAKESDOWN:
1185         case ACT_SDOWN:
1186                 cs->cur_at_seq = SEQ_NONE;
1187                 finish_shutdown(cs);
1188                 break;
1189         case ACT_CONNECT:
1190                 if (cs->onechannel) {
1191                         at_state->pending_commands |= PC_DLE1;
1192                         cs->commands_pending = 1;
1193                         break;
1194                 }
1195                 bcs->chstate |= CHS_D_UP;
1196                 gigaset_isdn_connD(bcs);
1197                 cs->ops->init_bchannel(bcs);
1198                 break;
1199         case ACT_DLE1:
1200                 cs->cur_at_seq = SEQ_NONE;
1201                 bcs = cs->bcs + cs->curchannel;
1202
1203                 bcs->chstate |= CHS_D_UP;
1204                 gigaset_isdn_connD(bcs);
1205                 cs->ops->init_bchannel(bcs);
1206                 break;
1207         case ACT_FAKEHUP:
1208                 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1209                 /* fall through */
1210         case ACT_DISCONNECT:
1211                 cs->cur_at_seq = SEQ_NONE;
1212                 at_state->cid = -1;
1213                 if (bcs && cs->onechannel && cs->dle) {
1214                         /* Check for other open channels not needed:
1215                          * DLE only used for M10x with one B channel.
1216                          */
1217                         at_state->pending_commands |= PC_DLE0;
1218                         cs->commands_pending = 1;
1219                 } else
1220                         disconnect(p_at_state);
1221                 break;
1222         case ACT_FAKEDLE0:
1223                 at_state->int_var[VAR_ZDLE] = 0;
1224                 cs->dle = 0;
1225                 /* fall through */
1226         case ACT_DLE0:
1227                 cs->cur_at_seq = SEQ_NONE;
1228                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1229                 disconnect(&at_state2);
1230                 break;
1231         case ACT_ABORTHUP:
1232                 cs->cur_at_seq = SEQ_NONE;
1233                 dev_warn(cs->dev, "Could not hang up.\n");
1234                 at_state->cid = -1;
1235                 if (bcs && cs->onechannel)
1236                         at_state->pending_commands |= PC_DLE0;
1237                 else
1238                         disconnect(p_at_state);
1239                 schedule_init(cs, MS_RECOVER);
1240                 break;
1241         case ACT_FAILDLE0:
1242                 cs->cur_at_seq = SEQ_NONE;
1243                 dev_warn(cs->dev, "Could not leave DLE mode.\n");
1244                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1245                 disconnect(&at_state2);
1246                 schedule_init(cs, MS_RECOVER);
1247                 break;
1248         case ACT_FAILDLE1:
1249                 cs->cur_at_seq = SEQ_NONE;
1250                 dev_warn(cs->dev,
1251                          "Could not enter DLE mode. Trying to hang up.\n");
1252                 channel = cs->curchannel;
1253                 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1254                 cs->commands_pending = 1;
1255                 break;
1256
1257         case ACT_CID: /* got cid; start dialing */
1258                 cs->cur_at_seq = SEQ_NONE;
1259                 channel = cs->curchannel;
1260                 if (ev->parameter > 0 && ev->parameter <= 65535) {
1261                         cs->bcs[channel].at_state.cid = ev->parameter;
1262                         cs->bcs[channel].at_state.pending_commands |=
1263                                 PC_DIAL;
1264                         cs->commands_pending = 1;
1265                         break;
1266                 }
1267                 /* fall through */
1268         case ACT_FAILCID:
1269                 cs->cur_at_seq = SEQ_NONE;
1270                 channel = cs->curchannel;
1271                 if (!reinit_and_retry(cs, channel)) {
1272                         dev_warn(cs->dev,
1273                                  "Could not get a call ID. Cannot dial.\n");
1274                         at_state2 = &cs->bcs[channel].at_state;
1275                         disconnect(&at_state2);
1276                 }
1277                 break;
1278         case ACT_ABORTCID:
1279                 cs->cur_at_seq = SEQ_NONE;
1280                 at_state2 = &cs->bcs[cs->curchannel].at_state;
1281                 disconnect(&at_state2);
1282                 break;
1283
1284         case ACT_DIALING:
1285         case ACT_ACCEPTED:
1286                 cs->cur_at_seq = SEQ_NONE;
1287                 break;
1288
1289         case ACT_ABORTACCEPT:   /* hangup/error/timeout during ICALL procssng */
1290                 disconnect(p_at_state);
1291                 break;
1292
1293         case ACT_ABORTDIAL:     /* error/timeout during dial preparation */
1294                 cs->cur_at_seq = SEQ_NONE;
1295                 at_state->pending_commands |= PC_HUP;
1296                 cs->commands_pending = 1;
1297                 break;
1298
1299         case ACT_REMOTEREJECT:  /* DISCONNECT_IND after dialling */
1300         case ACT_CONNTIMEOUT:   /* timeout waiting for ZSAU=ACTIVE */
1301         case ACT_REMOTEHUP:     /* DISCONNECT_IND with established connection */
1302                 at_state->pending_commands |= PC_HUP;
1303                 cs->commands_pending = 1;
1304                 break;
1305         case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1306                                are not handled properly anymore */
1307                 at_state->getstring = 1;
1308                 break;
1309         case ACT_SETVER:
1310                 if (!ev->ptr) {
1311                         *p_genresp = 1;
1312                         *p_resp_code = RSP_ERROR;
1313                         break;
1314                 }
1315                 s = ev->ptr;
1316
1317                 if (!strcmp(s, "OK")) {
1318                         /* OK without version string: assume old response */
1319                         *p_genresp = 1;
1320                         *p_resp_code = RSP_NONE;
1321                         break;
1322                 }
1323
1324                 for (i = 0; i < 4; ++i) {
1325                         val = simple_strtoul(s, (char **) &e, 10);
1326                         if (val > INT_MAX || e == s)
1327                                 break;
1328                         if (i == 3) {
1329                                 if (*e)
1330                                         break;
1331                         } else if (*e != '.')
1332                                 break;
1333                         else
1334                                 s = e + 1;
1335                         cs->fwver[i] = val;
1336                 }
1337                 if (i != 4) {
1338                         *p_genresp = 1;
1339                         *p_resp_code = RSP_ERROR;
1340                         break;
1341                 }
1342                 /*at_state->getstring = 1;*/
1343                 cs->gotfwver = 0;
1344                 break;
1345         case ACT_GOTVER:
1346                 if (cs->gotfwver == 0) {
1347                         cs->gotfwver = 1;
1348                         gig_dbg(DEBUG_EVENT,
1349                                 "firmware version %02d.%03d.%02d.%02d",
1350                                 cs->fwver[0], cs->fwver[1],
1351                                 cs->fwver[2], cs->fwver[3]);
1352                         break;
1353                 }
1354                 /* fall through */
1355         case ACT_FAILVER:
1356                 cs->gotfwver = -1;
1357                 dev_err(cs->dev, "could not read firmware version.\n");
1358                 break;
1359         case ACT_ERROR:
1360                 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1361                         __func__, at_state->ConState);
1362                 cs->cur_at_seq = SEQ_NONE;
1363                 break;
1364         case ACT_DEBUG:
1365                 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1366                         __func__, ev->type, at_state->ConState);
1367                 break;
1368         case ACT_WARN:
1369                 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1370                          __func__, ev->type, at_state->ConState);
1371                 break;
1372         case ACT_ZCAU:
1373                 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1374                          ev->parameter, at_state->ConState);
1375                 break;
1376
1377         /* events from the LL */
1378         case ACT_DIAL:
1379                 start_dial(at_state, ev->ptr, ev->parameter);
1380                 break;
1381         case ACT_ACCEPT:
1382                 start_accept(at_state);
1383                 break;
1384         case ACT_HUP:
1385                 at_state->pending_commands |= PC_HUP;
1386                 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1387                 cs->commands_pending = 1;
1388                 break;
1389
1390         /* hotplug events */
1391         case ACT_STOP:
1392                 do_stop(cs);
1393                 break;
1394         case ACT_START:
1395                 do_start(cs);
1396                 break;
1397
1398         /* events from the interface */
1399         case ACT_IF_LOCK:
1400                 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1401                 cs->waiting = 0;
1402                 wake_up(&cs->waitqueue);
1403                 break;
1404         case ACT_IF_VER:
1405                 if (ev->parameter != 0)
1406                         cs->cmd_result = -EINVAL;
1407                 else if (cs->gotfwver != 1) {
1408                         cs->cmd_result = -ENOENT;
1409                 } else {
1410                         memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1411                         cs->cmd_result = 0;
1412                 }
1413                 cs->waiting = 0;
1414                 wake_up(&cs->waitqueue);
1415                 break;
1416
1417         /* events from the proc file system */
1418         case ACT_PROC_CIDMODE:
1419                 spin_lock_irqsave(&cs->lock, flags);
1420                 if (ev->parameter != cs->cidmode) {
1421                         cs->cidmode = ev->parameter;
1422                         if (ev->parameter) {
1423                                 cs->at_state.pending_commands |= PC_CIDMODE;
1424                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1425                         } else {
1426                                 cs->at_state.pending_commands |= PC_UMMODE;
1427                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1428                         }
1429                         cs->commands_pending = 1;
1430                 }
1431                 spin_unlock_irqrestore(&cs->lock, flags);
1432                 cs->waiting = 0;
1433                 wake_up(&cs->waitqueue);
1434                 break;
1435
1436         /* events from the hardware drivers */
1437         case ACT_NOTIFY_BC_DOWN:
1438                 bchannel_down(bcs);
1439                 break;
1440         case ACT_NOTIFY_BC_UP:
1441                 bchannel_up(bcs);
1442                 break;
1443         case ACT_SHUTDOWN:
1444                 do_shutdown(cs);
1445                 break;
1446
1447
1448         default:
1449                 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1450                         *pp_command = at_state->bcs->commands[action - ACT_CMD];
1451                         if (!*pp_command) {
1452                                 *p_genresp = 1;
1453                                 *p_resp_code = RSP_NULL;
1454                         }
1455                 } else
1456                         dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1457         }
1458 }
1459
1460 /* State machine to do the calling and hangup procedure */
1461 static void process_event(struct cardstate *cs, struct event_t *ev)
1462 {
1463         struct bc_state *bcs;
1464         char *p_command = NULL;
1465         struct reply_t *rep;
1466         int rcode;
1467         int genresp = 0;
1468         int resp_code = RSP_ERROR;
1469         int sendcid;
1470         struct at_state_t *at_state;
1471         int index;
1472         int curact;
1473         unsigned long flags;
1474
1475         if (ev->cid >= 0) {
1476                 at_state = at_state_from_cid(cs, ev->cid);
1477                 if (!at_state) {
1478                         gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1479                                 ev->type, ev->cid);
1480                         gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1481                                           NULL, 0, NULL);
1482                         return;
1483                 }
1484         } else {
1485                 at_state = ev->at_state;
1486                 if (at_state_invalid(cs, at_state)) {
1487                         gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1488                                 at_state);
1489                         return;
1490                 }
1491         }
1492
1493         gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1494                 at_state->ConState, ev->type);
1495
1496         bcs = at_state->bcs;
1497         sendcid = at_state->cid;
1498
1499         /* Setting the pointer to the dial array */
1500         rep = at_state->replystruct;
1501
1502         spin_lock_irqsave(&cs->lock, flags);
1503         if (ev->type == EV_TIMEOUT) {
1504                 if (ev->parameter != at_state->timer_index
1505                     || !at_state->timer_active) {
1506                         ev->type = RSP_NONE; /* old timeout */
1507                         gig_dbg(DEBUG_EVENT, "old timeout");
1508                 } else if (!at_state->waiting)
1509                         gig_dbg(DEBUG_EVENT, "timeout occurred");
1510                 else
1511                         gig_dbg(DEBUG_EVENT, "stopped waiting");
1512         }
1513         spin_unlock_irqrestore(&cs->lock, flags);
1514
1515         /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1516            or at_state->str_var[STR_XXXX], set it */
1517         if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1518                 index = ev->type - RSP_VAR;
1519                 at_state->int_var[index] = ev->parameter;
1520         } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1521                 index = ev->type - RSP_STR;
1522                 kfree(at_state->str_var[index]);
1523                 at_state->str_var[index] = ev->ptr;
1524                 ev->ptr = NULL; /* prevent process_events() from
1525                                    deallocating ptr */
1526         }
1527
1528         if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1529                 at_state->getstring = 0;
1530
1531         /* Search row in dial array which matches modem response and current
1532            constate */
1533         for (;; rep++) {
1534                 rcode = rep->resp_code;
1535                 if (rcode == RSP_LAST) {
1536                         /* found nothing...*/
1537                         dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1538                                         "resp_code %d in ConState %d!\n",
1539                                  __func__, ev->type, at_state->ConState);
1540                         return;
1541                 }
1542                 if ((rcode == RSP_ANY || rcode == ev->type)
1543                   && ((int) at_state->ConState >= rep->min_ConState)
1544                   && (rep->max_ConState < 0
1545                       || (int) at_state->ConState <= rep->max_ConState)
1546                   && (rep->parameter < 0 || rep->parameter == ev->parameter))
1547                         break;
1548         }
1549
1550         p_command = rep->command;
1551
1552         at_state->waiting = 0;
1553         for (curact = 0; curact < MAXACT; ++curact) {
1554                 /* The row tells us what we should do  ..
1555                  */
1556                 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1557                           &genresp, &resp_code, ev);
1558                 if (!at_state)
1559                         break; /* may be freed after disconnect */
1560         }
1561
1562         if (at_state) {
1563                 /* Jump to the next con-state regarding the array */
1564                 if (rep->new_ConState >= 0)
1565                         at_state->ConState = rep->new_ConState;
1566
1567                 if (genresp) {
1568                         spin_lock_irqsave(&cs->lock, flags);
1569                         at_state->timer_expires = 0;
1570                         at_state->timer_active = 0;
1571                         spin_unlock_irqrestore(&cs->lock, flags);
1572                         gigaset_add_event(cs, at_state, resp_code,
1573                                           NULL, 0, NULL);
1574                 } else {
1575                         /* Send command to modem if not NULL... */
1576                         if (p_command) {
1577                                 if (cs->connected)
1578                                         send_command(cs, p_command,
1579                                                      sendcid, cs->dle,
1580                                                      GFP_ATOMIC);
1581                                 else
1582                                         gigaset_add_event(cs, at_state,
1583                                                           RSP_NODEV,
1584                                                           NULL, 0, NULL);
1585                         }
1586
1587                         spin_lock_irqsave(&cs->lock, flags);
1588                         if (!rep->timeout) {
1589                                 at_state->timer_expires = 0;
1590                                 at_state->timer_active = 0;
1591                         } else if (rep->timeout > 0) { /* new timeout */
1592                                 at_state->timer_expires = rep->timeout * 10;
1593                                 at_state->timer_active = 1;
1594                                 ++at_state->timer_index;
1595                         }
1596                         spin_unlock_irqrestore(&cs->lock, flags);
1597                 }
1598         }
1599 }
1600
1601 static void schedule_sequence(struct cardstate *cs,
1602                               struct at_state_t *at_state, int sequence)
1603 {
1604         cs->cur_at_seq = sequence;
1605         gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1606 }
1607
1608 static void process_command_flags(struct cardstate *cs)
1609 {
1610         struct at_state_t *at_state = NULL;
1611         struct bc_state *bcs;
1612         int i;
1613         int sequence;
1614         unsigned long flags;
1615
1616         cs->commands_pending = 0;
1617
1618         if (cs->cur_at_seq) {
1619                 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1620                 return;
1621         }
1622
1623         gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1624
1625         sequence = SEQ_NONE;
1626
1627         /* clear pending_commands and hangup channels on shutdown */
1628         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1629                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1630                 for (i = 0; i < cs->channels; ++i) {
1631                         bcs = cs->bcs + i;
1632                         at_state = &bcs->at_state;
1633                         at_state->pending_commands &=
1634                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1635                         if (at_state->cid > 0)
1636                                 at_state->pending_commands |= PC_HUP;
1637                         if (at_state->pending_commands & PC_CID) {
1638                                 at_state->pending_commands |= PC_NOCID;
1639                                 at_state->pending_commands &= ~PC_CID;
1640                         }
1641                 }
1642         }
1643
1644         /* clear pending_commands and hangup channels on reset */
1645         if (cs->at_state.pending_commands & PC_INIT) {
1646                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1647                 for (i = 0; i < cs->channels; ++i) {
1648                         bcs = cs->bcs + i;
1649                         at_state = &bcs->at_state;
1650                         at_state->pending_commands &=
1651                                 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1652                         if (at_state->cid > 0)
1653                                 at_state->pending_commands |= PC_HUP;
1654                         if (cs->mstate == MS_RECOVER) {
1655                                 if (at_state->pending_commands & PC_CID) {
1656                                         at_state->pending_commands |= PC_NOCID;
1657                                         at_state->pending_commands &= ~PC_CID;
1658                                 }
1659                         }
1660                 }
1661         }
1662
1663         /* only switch back to unimodem mode if no commands are pending and
1664          * no channels are up */
1665         spin_lock_irqsave(&cs->lock, flags);
1666         if (cs->at_state.pending_commands == PC_UMMODE
1667             && !cs->cidmode
1668             && list_empty(&cs->temp_at_states)
1669             && cs->mode == M_CID) {
1670                 sequence = SEQ_UMMODE;
1671                 at_state = &cs->at_state;
1672                 for (i = 0; i < cs->channels; ++i) {
1673                         bcs = cs->bcs + i;
1674                         if (bcs->at_state.pending_commands ||
1675                             bcs->at_state.cid > 0) {
1676                                 sequence = SEQ_NONE;
1677                                 break;
1678                         }
1679                 }
1680         }
1681         spin_unlock_irqrestore(&cs->lock, flags);
1682         cs->at_state.pending_commands &= ~PC_UMMODE;
1683         if (sequence != SEQ_NONE) {
1684                 schedule_sequence(cs, at_state, sequence);
1685                 return;
1686         }
1687
1688         for (i = 0; i < cs->channels; ++i) {
1689                 bcs = cs->bcs + i;
1690                 if (bcs->at_state.pending_commands & PC_HUP) {
1691                         bcs->at_state.pending_commands &= ~PC_HUP;
1692                         if (bcs->at_state.pending_commands & PC_CID) {
1693                                 /* not yet dialing: PC_NOCID is sufficient */
1694                                 bcs->at_state.pending_commands |= PC_NOCID;
1695                                 bcs->at_state.pending_commands &= ~PC_CID;
1696                         } else {
1697                                 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1698                                 return;
1699                         }
1700                 }
1701                 if (bcs->at_state.pending_commands & PC_NOCID) {
1702                         bcs->at_state.pending_commands &= ~PC_NOCID;
1703                         cs->curchannel = bcs->channel;
1704                         schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1705                         return;
1706                 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1707                         bcs->at_state.pending_commands &= ~PC_DLE0;
1708                         cs->curchannel = bcs->channel;
1709                         schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1710                         return;
1711                 }
1712         }
1713
1714         list_for_each_entry(at_state, &cs->temp_at_states, list)
1715                 if (at_state->pending_commands & PC_HUP) {
1716                         at_state->pending_commands &= ~PC_HUP;
1717                         schedule_sequence(cs, at_state, SEQ_HUP);
1718                         return;
1719                 }
1720
1721         if (cs->at_state.pending_commands & PC_INIT) {
1722                 cs->at_state.pending_commands &= ~PC_INIT;
1723                 cs->dle = 0;
1724                 cs->inbuf->inputstate = INS_command;
1725                 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1726                 return;
1727         }
1728         if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1729                 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1730                 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1731                 return;
1732         }
1733         if (cs->at_state.pending_commands & PC_CIDMODE) {
1734                 cs->at_state.pending_commands &= ~PC_CIDMODE;
1735                 if (cs->mode == M_UNIMODEM) {
1736                         cs->retry_count = 1;
1737                         schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1738                         return;
1739                 }
1740         }
1741
1742         for (i = 0; i < cs->channels; ++i) {
1743                 bcs = cs->bcs + i;
1744                 if (bcs->at_state.pending_commands & PC_DLE1) {
1745                         bcs->at_state.pending_commands &= ~PC_DLE1;
1746                         cs->curchannel = bcs->channel;
1747                         schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1748                         return;
1749                 }
1750                 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1751                         bcs->at_state.pending_commands &= ~PC_ACCEPT;
1752                         schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1753                         return;
1754                 }
1755                 if (bcs->at_state.pending_commands & PC_DIAL) {
1756                         bcs->at_state.pending_commands &= ~PC_DIAL;
1757                         schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1758                         return;
1759                 }
1760                 if (bcs->at_state.pending_commands & PC_CID) {
1761                         switch (cs->mode) {
1762                         case M_UNIMODEM:
1763                                 cs->at_state.pending_commands |= PC_CIDMODE;
1764                                 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1765                                 cs->commands_pending = 1;
1766                                 return;
1767                         case M_UNKNOWN:
1768                                 schedule_init(cs, MS_INIT);
1769                                 return;
1770                         }
1771                         bcs->at_state.pending_commands &= ~PC_CID;
1772                         cs->curchannel = bcs->channel;
1773                         cs->retry_count = 2;
1774                         schedule_sequence(cs, &cs->at_state, SEQ_CID);
1775                         return;
1776                 }
1777         }
1778 }
1779
1780 static void process_events(struct cardstate *cs)
1781 {
1782         struct event_t *ev;
1783         unsigned head, tail;
1784         int i;
1785         int check_flags = 0;
1786         int was_busy;
1787         unsigned long flags;
1788
1789         spin_lock_irqsave(&cs->ev_lock, flags);
1790         head = cs->ev_head;
1791
1792         for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1793                 tail = cs->ev_tail;
1794                 if (tail == head) {
1795                         if (!check_flags && !cs->commands_pending)
1796                                 break;
1797                         check_flags = 0;
1798                         spin_unlock_irqrestore(&cs->ev_lock, flags);
1799                         process_command_flags(cs);
1800                         spin_lock_irqsave(&cs->ev_lock, flags);
1801                         tail = cs->ev_tail;
1802                         if (tail == head) {
1803                                 if (!cs->commands_pending)
1804                                         break;
1805                                 continue;
1806                         }
1807                 }
1808
1809                 ev = cs->events + head;
1810                 was_busy = cs->cur_at_seq != SEQ_NONE;
1811                 spin_unlock_irqrestore(&cs->ev_lock, flags);
1812                 process_event(cs, ev);
1813                 spin_lock_irqsave(&cs->ev_lock, flags);
1814                 kfree(ev->ptr);
1815                 ev->ptr = NULL;
1816                 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1817                         check_flags = 1;
1818
1819                 head = (head + 1) % MAX_EVENTS;
1820                 cs->ev_head = head;
1821         }
1822
1823         spin_unlock_irqrestore(&cs->ev_lock, flags);
1824
1825         if (i == 2 * MAX_EVENTS) {
1826                 dev_err(cs->dev,
1827                         "infinite loop in process_events; aborting.\n");
1828         }
1829 }
1830
1831 /* tasklet scheduled on any event received from the Gigaset device
1832  * parameter:
1833  *      data    ISDN controller state structure
1834  */
1835 void gigaset_handle_event(unsigned long data)
1836 {
1837         struct cardstate *cs = (struct cardstate *) data;
1838
1839         /* handle incoming data on control/common channel */
1840         if (cs->inbuf->head != cs->inbuf->tail) {
1841                 gig_dbg(DEBUG_INTR, "processing new data");
1842                 cs->ops->handle_input(cs->inbuf);
1843         }
1844
1845         process_events(cs);
1846 }