The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 1 | /* //device/system/reference-ril/atchannel.c |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "atchannel.h" |
| 19 | #include "at_tok.h" |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <pthread.h> |
| 24 | #include <ctype.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <errno.h> |
| 27 | #include <fcntl.h> |
| 28 | #include <sys/time.h> |
| 29 | #include <time.h> |
| 30 | #include <unistd.h> |
| 31 | |
| 32 | #define LOG_NDEBUG 0 |
| 33 | #define LOG_TAG "AT" |
| 34 | #include <utils/Log.h> |
| 35 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 36 | #include "misc.h" |
| 37 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 38 | |
Chih-Hung Hsieh | 434554c | 2016-05-12 10:01:16 -0700 | [diff] [blame] | 39 | #define NUM_ELEMS(x) (sizeof(x)/sizeof((x)[0])) |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 40 | |
| 41 | #define MAX_AT_RESPONSE (8 * 1024) |
| 42 | #define HANDSHAKE_RETRY_COUNT 8 |
| 43 | #define HANDSHAKE_TIMEOUT_MSEC 250 |
| 44 | |
| 45 | static pthread_t s_tid_reader; |
| 46 | static int s_fd = -1; /* fd of the AT channel */ |
| 47 | static ATUnsolHandler s_unsolHandler; |
| 48 | |
| 49 | /* for input buffering */ |
| 50 | |
| 51 | static char s_ATBuffer[MAX_AT_RESPONSE+1]; |
| 52 | static char *s_ATBufferCur = s_ATBuffer; |
| 53 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 54 | #if AT_DEBUG |
| 55 | void AT_DUMP(const char* prefix, const char* buff, int len) |
| 56 | { |
| 57 | if (len < 0) |
| 58 | len = strlen(buff); |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 59 | RLOGD("%.*s", len, buff); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 60 | } |
| 61 | #endif |
| 62 | |
| 63 | /* |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 64 | * There is one reader thread |s_tid_reader| and potentially multiple writer |
| 65 | * threads. |s_commandmutex| and |s_commandcond| are used to maintain the |
| 66 | * condition that the writer thread will not read from |sp_response| until the |
| 67 | * reader thread has signaled itself is finished, etc. |s_writeMutex| is used to |
| 68 | * prevent multiple writer threads from calling at_send_command_full_nolock |
| 69 | * function at the same time. |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 70 | */ |
| 71 | |
| 72 | static pthread_mutex_t s_commandmutex = PTHREAD_MUTEX_INITIALIZER; |
| 73 | static pthread_cond_t s_commandcond = PTHREAD_COND_INITIALIZER; |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 74 | static pthread_mutex_t s_writeMutex = PTHREAD_MUTEX_INITIALIZER; |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 75 | |
| 76 | static ATCommandType s_type; |
| 77 | static const char *s_responsePrefix = NULL; |
| 78 | static const char *s_smsPDU = NULL; |
| 79 | static ATResponse *sp_response = NULL; |
| 80 | |
| 81 | static void (*s_onTimeout)(void) = NULL; |
| 82 | static void (*s_onReaderClosed)(void) = NULL; |
| 83 | static int s_readerClosed; |
| 84 | |
| 85 | static void onReaderClosed(); |
| 86 | static int writeCtrlZ (const char *s); |
| 87 | static int writeline (const char *s); |
| 88 | |
Jinhui Li | 1147621 | 2016-03-24 08:55:10 +0800 | [diff] [blame] | 89 | #define NS_PER_S 1000000000 |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 90 | static void setTimespecRelative(struct timespec *p_ts, long long msec) |
| 91 | { |
| 92 | struct timeval tv; |
| 93 | |
| 94 | gettimeofday(&tv, (struct timezone *) NULL); |
| 95 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 96 | p_ts->tv_sec = tv.tv_sec + (msec / 1000); |
| 97 | p_ts->tv_nsec = (tv.tv_usec + (msec % 1000) * 1000L ) * 1000L; |
Jinhui Li | 1147621 | 2016-03-24 08:55:10 +0800 | [diff] [blame] | 98 | /* assuming tv.tv_usec < 10^6 */ |
| 99 | if (p_ts->tv_nsec >= NS_PER_S) { |
| 100 | p_ts->tv_sec++; |
| 101 | p_ts->tv_nsec -= NS_PER_S; |
| 102 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 103 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 104 | |
| 105 | static void sleepMsec(long long msec) |
| 106 | { |
| 107 | struct timespec ts; |
| 108 | int err; |
| 109 | |
| 110 | ts.tv_sec = (msec / 1000); |
| 111 | ts.tv_nsec = (msec % 1000) * 1000 * 1000; |
| 112 | |
| 113 | do { |
| 114 | err = nanosleep (&ts, &ts); |
| 115 | } while (err < 0 && errno == EINTR); |
| 116 | } |
| 117 | |
| 118 | |
| 119 | |
| 120 | /** add an intermediate response to sp_response*/ |
| 121 | static void addIntermediate(const char *line) |
| 122 | { |
| 123 | ATLine *p_new; |
| 124 | |
| 125 | p_new = (ATLine *) malloc(sizeof(ATLine)); |
| 126 | |
| 127 | p_new->line = strdup(line); |
| 128 | |
| 129 | /* note: this adds to the head of the list, so the list |
| 130 | will be in reverse order of lines received. the order is flipped |
| 131 | again before passing on to the command issuer */ |
| 132 | p_new->p_next = sp_response->p_intermediates; |
| 133 | sp_response->p_intermediates = p_new; |
| 134 | } |
| 135 | |
| 136 | |
| 137 | /** |
| 138 | * returns 1 if line is a final response indicating error |
| 139 | * See 27.007 annex B |
| 140 | * WARNING: NO CARRIER and others are sometimes unsolicited |
| 141 | */ |
| 142 | static const char * s_finalResponsesError[] = { |
| 143 | "ERROR", |
| 144 | "+CMS ERROR:", |
| 145 | "+CME ERROR:", |
| 146 | "NO CARRIER", /* sometimes! */ |
| 147 | "NO ANSWER", |
| 148 | "NO DIALTONE", |
| 149 | }; |
| 150 | static int isFinalResponseError(const char *line) |
| 151 | { |
| 152 | size_t i; |
| 153 | |
| 154 | for (i = 0 ; i < NUM_ELEMS(s_finalResponsesError) ; i++) { |
| 155 | if (strStartsWith(line, s_finalResponsesError[i])) { |
| 156 | return 1; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * returns 1 if line is a final response indicating success |
| 165 | * See 27.007 annex B |
| 166 | * WARNING: NO CARRIER and others are sometimes unsolicited |
| 167 | */ |
| 168 | static const char * s_finalResponsesSuccess[] = { |
| 169 | "OK", |
| 170 | "CONNECT" /* some stacks start up data on another channel */ |
| 171 | }; |
| 172 | static int isFinalResponseSuccess(const char *line) |
| 173 | { |
| 174 | size_t i; |
| 175 | |
| 176 | for (i = 0 ; i < NUM_ELEMS(s_finalResponsesSuccess) ; i++) { |
| 177 | if (strStartsWith(line, s_finalResponsesSuccess[i])) { |
| 178 | return 1; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * returns 1 if line is a final response, either error or success |
| 187 | * See 27.007 annex B |
| 188 | * WARNING: NO CARRIER and others are sometimes unsolicited |
| 189 | */ |
| 190 | static int isFinalResponse(const char *line) |
| 191 | { |
| 192 | return isFinalResponseSuccess(line) || isFinalResponseError(line); |
| 193 | } |
| 194 | |
| 195 | |
| 196 | /** |
| 197 | * returns 1 if line is the first line in (what will be) a two-line |
| 198 | * SMS unsolicited response |
| 199 | */ |
| 200 | static const char * s_smsUnsoliciteds[] = { |
| 201 | "+CMT:", |
| 202 | "+CDS:", |
| 203 | "+CBM:" |
| 204 | }; |
| 205 | static int isSMSUnsolicited(const char *line) |
| 206 | { |
| 207 | size_t i; |
| 208 | |
| 209 | for (i = 0 ; i < NUM_ELEMS(s_smsUnsoliciteds) ; i++) { |
| 210 | if (strStartsWith(line, s_smsUnsoliciteds[i])) { |
| 211 | return 1; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /** assumes s_commandmutex is held */ |
| 220 | static void handleFinalResponse(const char *line) |
| 221 | { |
| 222 | sp_response->finalResponse = strdup(line); |
| 223 | |
| 224 | pthread_cond_signal(&s_commandcond); |
| 225 | } |
| 226 | |
| 227 | static void handleUnsolicited(const char *line) |
| 228 | { |
| 229 | if (s_unsolHandler != NULL) { |
| 230 | s_unsolHandler(line, NULL); |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | static void processLine(const char *line) |
| 235 | { |
| 236 | pthread_mutex_lock(&s_commandmutex); |
| 237 | |
| 238 | if (sp_response == NULL) { |
| 239 | /* no command pending */ |
| 240 | handleUnsolicited(line); |
| 241 | } else if (isFinalResponseSuccess(line)) { |
| 242 | sp_response->success = 1; |
| 243 | handleFinalResponse(line); |
| 244 | } else if (isFinalResponseError(line)) { |
| 245 | sp_response->success = 0; |
| 246 | handleFinalResponse(line); |
| 247 | } else if (s_smsPDU != NULL && 0 == strcmp(line, "> ")) { |
| 248 | // See eg. TS 27.005 4.3 |
| 249 | // Commands like AT+CMGS have a "> " prompt |
| 250 | writeCtrlZ(s_smsPDU); |
| 251 | s_smsPDU = NULL; |
| 252 | } else switch (s_type) { |
| 253 | case NO_RESULT: |
| 254 | handleUnsolicited(line); |
| 255 | break; |
| 256 | case NUMERIC: |
| 257 | if (sp_response->p_intermediates == NULL |
| 258 | && isdigit(line[0]) |
| 259 | ) { |
| 260 | addIntermediate(line); |
| 261 | } else { |
| 262 | /* either we already have an intermediate response or |
| 263 | the line doesn't begin with a digit */ |
| 264 | handleUnsolicited(line); |
| 265 | } |
| 266 | break; |
| 267 | case SINGLELINE: |
| 268 | if (sp_response->p_intermediates == NULL |
| 269 | && strStartsWith (line, s_responsePrefix) |
| 270 | ) { |
| 271 | addIntermediate(line); |
| 272 | } else { |
| 273 | /* we already have an intermediate response */ |
| 274 | handleUnsolicited(line); |
| 275 | } |
| 276 | break; |
| 277 | case MULTILINE: |
| 278 | if (strStartsWith (line, s_responsePrefix)) { |
| 279 | addIntermediate(line); |
| 280 | } else { |
| 281 | handleUnsolicited(line); |
| 282 | } |
| 283 | break; |
| 284 | |
| 285 | default: /* this should never be reached */ |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 286 | RLOGE("Unsupported AT command type %d\n", s_type); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 287 | handleUnsolicited(line); |
| 288 | break; |
| 289 | } |
| 290 | |
| 291 | pthread_mutex_unlock(&s_commandmutex); |
| 292 | } |
| 293 | |
| 294 | |
| 295 | /** |
| 296 | * Returns a pointer to the end of the next line |
| 297 | * special-cases the "> " SMS prompt |
| 298 | * |
| 299 | * returns NULL if there is no complete line |
| 300 | */ |
| 301 | static char * findNextEOL(char *cur) |
| 302 | { |
| 303 | if (cur[0] == '>' && cur[1] == ' ' && cur[2] == '\0') { |
| 304 | /* SMS prompt character...not \r terminated */ |
| 305 | return cur+2; |
| 306 | } |
| 307 | |
| 308 | // Find next newline |
| 309 | while (*cur != '\0' && *cur != '\r' && *cur != '\n') cur++; |
| 310 | |
| 311 | return *cur == '\0' ? NULL : cur; |
| 312 | } |
| 313 | |
| 314 | |
| 315 | /** |
| 316 | * Reads a line from the AT channel, returns NULL on timeout. |
| 317 | * Assumes it has exclusive read access to the FD |
| 318 | * |
| 319 | * This line is valid only until the next call to readline |
| 320 | * |
| 321 | * This function exists because as of writing, android libc does not |
| 322 | * have buffered stdio. |
| 323 | */ |
| 324 | |
| 325 | static const char *readline() |
| 326 | { |
| 327 | ssize_t count; |
| 328 | |
| 329 | char *p_read = NULL; |
| 330 | char *p_eol = NULL; |
| 331 | char *ret; |
| 332 | |
| 333 | /* this is a little odd. I use *s_ATBufferCur == 0 to |
| 334 | * mean "buffer consumed completely". If it points to a character, than |
| 335 | * the buffer continues until a \0 |
| 336 | */ |
| 337 | if (*s_ATBufferCur == '\0') { |
| 338 | /* empty buffer */ |
| 339 | s_ATBufferCur = s_ATBuffer; |
| 340 | *s_ATBufferCur = '\0'; |
| 341 | p_read = s_ATBuffer; |
| 342 | } else { /* *s_ATBufferCur != '\0' */ |
| 343 | /* there's data in the buffer from the last read */ |
| 344 | |
| 345 | // skip over leading newlines |
| 346 | while (*s_ATBufferCur == '\r' || *s_ATBufferCur == '\n') |
| 347 | s_ATBufferCur++; |
| 348 | |
| 349 | p_eol = findNextEOL(s_ATBufferCur); |
| 350 | |
| 351 | if (p_eol == NULL) { |
| 352 | /* a partial line. move it up and prepare to read more */ |
| 353 | size_t len; |
| 354 | |
| 355 | len = strlen(s_ATBufferCur); |
| 356 | |
| 357 | memmove(s_ATBuffer, s_ATBufferCur, len + 1); |
| 358 | p_read = s_ATBuffer + len; |
| 359 | s_ATBufferCur = s_ATBuffer; |
| 360 | } |
| 361 | /* Otherwise, (p_eol !- NULL) there is a complete line */ |
| 362 | /* that will be returned the while () loop below */ |
| 363 | } |
| 364 | |
| 365 | while (p_eol == NULL) { |
| 366 | if (0 == MAX_AT_RESPONSE - (p_read - s_ATBuffer)) { |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 367 | RLOGE("ERROR: Input line exceeded buffer\n"); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 368 | /* ditch buffer and start over again */ |
| 369 | s_ATBufferCur = s_ATBuffer; |
| 370 | *s_ATBufferCur = '\0'; |
| 371 | p_read = s_ATBuffer; |
| 372 | } |
| 373 | |
| 374 | do { |
| 375 | count = read(s_fd, p_read, |
| 376 | MAX_AT_RESPONSE - (p_read - s_ATBuffer)); |
| 377 | } while (count < 0 && errno == EINTR); |
| 378 | |
| 379 | if (count > 0) { |
| 380 | AT_DUMP( "<< ", p_read, count ); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 381 | |
| 382 | p_read[count] = '\0'; |
| 383 | |
| 384 | // skip over leading newlines |
| 385 | while (*s_ATBufferCur == '\r' || *s_ATBufferCur == '\n') |
| 386 | s_ATBufferCur++; |
| 387 | |
| 388 | p_eol = findNextEOL(s_ATBufferCur); |
| 389 | p_read += count; |
| 390 | } else if (count <= 0) { |
| 391 | /* read error encountered or EOF reached */ |
| 392 | if(count == 0) { |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 393 | RLOGD("atchannel: EOF reached"); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 394 | } else { |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 395 | RLOGD("atchannel: read error %s", strerror(errno)); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 396 | } |
| 397 | return NULL; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | /* a full line in the buffer. Place a \0 over the \r and return */ |
| 402 | |
| 403 | ret = s_ATBufferCur; |
| 404 | *p_eol = '\0'; |
| 405 | s_ATBufferCur = p_eol + 1; /* this will always be <= p_read, */ |
| 406 | /* and there will be a \0 at *p_read */ |
| 407 | |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 408 | RLOGD("AT< %s\n", ret); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | |
| 413 | static void onReaderClosed() |
| 414 | { |
| 415 | if (s_onReaderClosed != NULL && s_readerClosed == 0) { |
| 416 | |
| 417 | pthread_mutex_lock(&s_commandmutex); |
| 418 | |
| 419 | s_readerClosed = 1; |
| 420 | |
| 421 | pthread_cond_signal(&s_commandcond); |
| 422 | |
| 423 | pthread_mutex_unlock(&s_commandmutex); |
| 424 | |
| 425 | s_onReaderClosed(); |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | |
Sanket Padawe | f0c8ca7 | 2016-06-30 15:01:08 -0700 | [diff] [blame] | 430 | static void *readerLoop(void *arg __unused) |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 431 | { |
| 432 | for (;;) { |
| 433 | const char * line; |
| 434 | |
| 435 | line = readline(); |
| 436 | |
| 437 | if (line == NULL) { |
| 438 | break; |
| 439 | } |
| 440 | |
| 441 | if(isSMSUnsolicited(line)) { |
| 442 | char *line1; |
| 443 | const char *line2; |
| 444 | |
| 445 | // The scope of string returned by 'readline()' is valid only |
| 446 | // till next call to 'readline()' hence making a copy of line |
| 447 | // before calling readline again. |
| 448 | line1 = strdup(line); |
| 449 | line2 = readline(); |
| 450 | |
| 451 | if (line2 == NULL) { |
Sanket Padawe | 1fbb382 | 2016-03-09 17:51:57 -0800 | [diff] [blame] | 452 | free(line1); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 453 | break; |
| 454 | } |
| 455 | |
| 456 | if (s_unsolHandler != NULL) { |
| 457 | s_unsolHandler (line1, line2); |
| 458 | } |
| 459 | free(line1); |
| 460 | } else { |
| 461 | processLine(line); |
| 462 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | onReaderClosed(); |
| 466 | |
| 467 | return NULL; |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * Sends string s to the radio with a \r appended. |
| 472 | * Returns AT_ERROR_* on error, 0 on success |
| 473 | * |
| 474 | * This function exists because as of writing, android libc does not |
| 475 | * have buffered stdio. |
| 476 | */ |
| 477 | static int writeline (const char *s) |
| 478 | { |
| 479 | size_t cur = 0; |
| 480 | size_t len = strlen(s); |
| 481 | ssize_t written; |
| 482 | |
| 483 | if (s_fd < 0 || s_readerClosed > 0) { |
| 484 | return AT_ERROR_CHANNEL_CLOSED; |
| 485 | } |
| 486 | |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 487 | RLOGD("AT> %s\n", s); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 488 | |
| 489 | AT_DUMP( ">> ", s, strlen(s) ); |
| 490 | |
| 491 | /* the main string */ |
| 492 | while (cur < len) { |
| 493 | do { |
| 494 | written = write (s_fd, s + cur, len - cur); |
| 495 | } while (written < 0 && errno == EINTR); |
| 496 | |
| 497 | if (written < 0) { |
| 498 | return AT_ERROR_GENERIC; |
| 499 | } |
| 500 | |
| 501 | cur += written; |
| 502 | } |
| 503 | |
| 504 | /* the \r */ |
| 505 | |
| 506 | do { |
| 507 | written = write (s_fd, "\r" , 1); |
| 508 | } while ((written < 0 && errno == EINTR) || (written == 0)); |
| 509 | |
| 510 | if (written < 0) { |
| 511 | return AT_ERROR_GENERIC; |
| 512 | } |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | static int writeCtrlZ (const char *s) |
| 517 | { |
| 518 | size_t cur = 0; |
| 519 | size_t len = strlen(s); |
| 520 | ssize_t written; |
| 521 | |
| 522 | if (s_fd < 0 || s_readerClosed > 0) { |
| 523 | return AT_ERROR_CHANNEL_CLOSED; |
| 524 | } |
| 525 | |
Wink Saville | 4dcab4f | 2012-11-19 16:05:13 -0800 | [diff] [blame] | 526 | RLOGD("AT> %s^Z\n", s); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 527 | |
| 528 | AT_DUMP( ">* ", s, strlen(s) ); |
| 529 | |
| 530 | /* the main string */ |
| 531 | while (cur < len) { |
| 532 | do { |
| 533 | written = write (s_fd, s + cur, len - cur); |
| 534 | } while (written < 0 && errno == EINTR); |
| 535 | |
| 536 | if (written < 0) { |
| 537 | return AT_ERROR_GENERIC; |
| 538 | } |
| 539 | |
| 540 | cur += written; |
| 541 | } |
| 542 | |
| 543 | /* the ^Z */ |
| 544 | |
| 545 | do { |
| 546 | written = write (s_fd, "\032" , 1); |
| 547 | } while ((written < 0 && errno == EINTR) || (written == 0)); |
| 548 | |
| 549 | if (written < 0) { |
| 550 | return AT_ERROR_GENERIC; |
| 551 | } |
| 552 | |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | static void clearPendingCommand() |
| 557 | { |
| 558 | if (sp_response != NULL) { |
| 559 | at_response_free(sp_response); |
| 560 | } |
| 561 | |
| 562 | sp_response = NULL; |
| 563 | s_responsePrefix = NULL; |
| 564 | s_smsPDU = NULL; |
| 565 | } |
| 566 | |
| 567 | |
| 568 | /** |
| 569 | * Starts AT handler on stream "fd' |
| 570 | * returns 0 on success, -1 on error |
| 571 | */ |
| 572 | int at_open(int fd, ATUnsolHandler h) |
| 573 | { |
| 574 | int ret; |
| 575 | pthread_t tid; |
| 576 | pthread_attr_t attr; |
| 577 | |
| 578 | s_fd = fd; |
| 579 | s_unsolHandler = h; |
| 580 | s_readerClosed = 0; |
| 581 | |
| 582 | s_responsePrefix = NULL; |
| 583 | s_smsPDU = NULL; |
| 584 | sp_response = NULL; |
| 585 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 586 | pthread_attr_init (&attr); |
| 587 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| 588 | |
| 589 | ret = pthread_create(&s_tid_reader, &attr, readerLoop, &attr); |
| 590 | |
| 591 | if (ret < 0) { |
| 592 | perror ("pthread_create"); |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | /* FIXME is it ok to call this from the reader and the command thread? */ |
| 601 | void at_close() |
| 602 | { |
| 603 | if (s_fd >= 0) { |
| 604 | close(s_fd); |
| 605 | } |
| 606 | s_fd = -1; |
| 607 | |
| 608 | pthread_mutex_lock(&s_commandmutex); |
| 609 | |
| 610 | s_readerClosed = 1; |
| 611 | |
| 612 | pthread_cond_signal(&s_commandcond); |
| 613 | |
| 614 | pthread_mutex_unlock(&s_commandmutex); |
| 615 | |
| 616 | /* the reader thread should eventually die */ |
| 617 | } |
| 618 | |
| 619 | static ATResponse * at_response_new() |
| 620 | { |
| 621 | return (ATResponse *) calloc(1, sizeof(ATResponse)); |
| 622 | } |
| 623 | |
| 624 | void at_response_free(ATResponse *p_response) |
| 625 | { |
| 626 | ATLine *p_line; |
| 627 | |
| 628 | if (p_response == NULL) return; |
| 629 | |
| 630 | p_line = p_response->p_intermediates; |
| 631 | |
| 632 | while (p_line != NULL) { |
| 633 | ATLine *p_toFree; |
| 634 | |
| 635 | p_toFree = p_line; |
| 636 | p_line = p_line->p_next; |
| 637 | |
| 638 | free(p_toFree->line); |
| 639 | free(p_toFree); |
| 640 | } |
| 641 | |
| 642 | free (p_response->finalResponse); |
| 643 | free (p_response); |
| 644 | } |
| 645 | |
| 646 | /** |
| 647 | * The line reader places the intermediate responses in reverse order |
| 648 | * here we flip them back |
| 649 | */ |
| 650 | static void reverseIntermediates(ATResponse *p_response) |
| 651 | { |
| 652 | ATLine *pcur,*pnext; |
| 653 | |
| 654 | pcur = p_response->p_intermediates; |
| 655 | p_response->p_intermediates = NULL; |
| 656 | |
| 657 | while (pcur != NULL) { |
| 658 | pnext = pcur->p_next; |
| 659 | pcur->p_next = p_response->p_intermediates; |
| 660 | p_response->p_intermediates = pcur; |
| 661 | pcur = pnext; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * Internal send_command implementation |
| 667 | * Doesn't lock or call the timeout callback |
| 668 | * |
| 669 | * timeoutMsec == 0 means infinite timeout |
| 670 | */ |
| 671 | |
| 672 | static int at_send_command_full_nolock (const char *command, ATCommandType type, |
| 673 | const char *responsePrefix, const char *smspdu, |
| 674 | long long timeoutMsec, ATResponse **pp_outResponse) |
| 675 | { |
| 676 | int err = 0; |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 677 | struct timespec ts; |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 678 | |
| 679 | if(sp_response != NULL) { |
| 680 | err = AT_ERROR_COMMAND_PENDING; |
| 681 | goto error; |
| 682 | } |
| 683 | |
| 684 | err = writeline (command); |
| 685 | |
| 686 | if (err < 0) { |
| 687 | goto error; |
| 688 | } |
| 689 | |
| 690 | s_type = type; |
| 691 | s_responsePrefix = responsePrefix; |
| 692 | s_smsPDU = smspdu; |
| 693 | sp_response = at_response_new(); |
| 694 | |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 695 | if (timeoutMsec != 0) { |
| 696 | setTimespecRelative(&ts, timeoutMsec); |
| 697 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 698 | |
| 699 | while (sp_response->finalResponse == NULL && s_readerClosed == 0) { |
| 700 | if (timeoutMsec != 0) { |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 701 | err = pthread_cond_timedwait(&s_commandcond, &s_commandmutex, &ts); |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 702 | } else { |
| 703 | err = pthread_cond_wait(&s_commandcond, &s_commandmutex); |
| 704 | } |
| 705 | |
| 706 | if (err == ETIMEDOUT) { |
| 707 | err = AT_ERROR_TIMEOUT; |
| 708 | goto error; |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | if (pp_outResponse == NULL) { |
| 713 | at_response_free(sp_response); |
| 714 | } else { |
| 715 | /* line reader stores intermediate responses in reverse order */ |
| 716 | reverseIntermediates(sp_response); |
| 717 | *pp_outResponse = sp_response; |
| 718 | } |
| 719 | |
| 720 | sp_response = NULL; |
| 721 | |
| 722 | if(s_readerClosed > 0) { |
| 723 | err = AT_ERROR_CHANNEL_CLOSED; |
| 724 | goto error; |
| 725 | } |
| 726 | |
| 727 | err = 0; |
| 728 | error: |
| 729 | clearPendingCommand(); |
| 730 | |
| 731 | return err; |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * Internal send_command implementation |
| 736 | * |
| 737 | * timeoutMsec == 0 means infinite timeout |
| 738 | */ |
| 739 | static int at_send_command_full (const char *command, ATCommandType type, |
| 740 | const char *responsePrefix, const char *smspdu, |
| 741 | long long timeoutMsec, ATResponse **pp_outResponse) |
| 742 | { |
| 743 | int err; |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 744 | bool inEmulator; |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 745 | |
| 746 | if (0 != pthread_equal(s_tid_reader, pthread_self())) { |
| 747 | /* cannot be called from reader thread */ |
| 748 | return AT_ERROR_INVALID_THREAD; |
| 749 | } |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 750 | inEmulator = isInEmulator(); |
| 751 | if (inEmulator) { |
| 752 | pthread_mutex_lock(&s_writeMutex); |
| 753 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 754 | pthread_mutex_lock(&s_commandmutex); |
| 755 | |
| 756 | err = at_send_command_full_nolock(command, type, |
| 757 | responsePrefix, smspdu, |
| 758 | timeoutMsec, pp_outResponse); |
| 759 | |
| 760 | pthread_mutex_unlock(&s_commandmutex); |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 761 | if (inEmulator) { |
| 762 | pthread_mutex_unlock(&s_writeMutex); |
| 763 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 764 | |
| 765 | if (err == AT_ERROR_TIMEOUT && s_onTimeout != NULL) { |
| 766 | s_onTimeout(); |
| 767 | } |
| 768 | |
| 769 | return err; |
| 770 | } |
| 771 | |
| 772 | |
| 773 | /** |
| 774 | * Issue a single normal AT command with no intermediate response expected |
| 775 | * |
| 776 | * "command" should not include \r |
| 777 | * pp_outResponse can be NULL |
| 778 | * |
| 779 | * if non-NULL, the resulting ATResponse * must be eventually freed with |
| 780 | * at_response_free |
| 781 | */ |
| 782 | int at_send_command (const char *command, ATResponse **pp_outResponse) |
| 783 | { |
| 784 | int err; |
| 785 | |
| 786 | err = at_send_command_full (command, NO_RESULT, NULL, |
| 787 | NULL, 0, pp_outResponse); |
| 788 | |
| 789 | return err; |
| 790 | } |
| 791 | |
| 792 | |
| 793 | int at_send_command_singleline (const char *command, |
| 794 | const char *responsePrefix, |
| 795 | ATResponse **pp_outResponse) |
| 796 | { |
| 797 | int err; |
| 798 | |
| 799 | err = at_send_command_full (command, SINGLELINE, responsePrefix, |
| 800 | NULL, 0, pp_outResponse); |
| 801 | |
| 802 | if (err == 0 && pp_outResponse != NULL |
| 803 | && (*pp_outResponse)->success > 0 |
| 804 | && (*pp_outResponse)->p_intermediates == NULL |
| 805 | ) { |
| 806 | /* successful command must have an intermediate response */ |
| 807 | at_response_free(*pp_outResponse); |
| 808 | *pp_outResponse = NULL; |
| 809 | return AT_ERROR_INVALID_RESPONSE; |
| 810 | } |
| 811 | |
| 812 | return err; |
| 813 | } |
| 814 | |
| 815 | |
| 816 | int at_send_command_numeric (const char *command, |
| 817 | ATResponse **pp_outResponse) |
| 818 | { |
| 819 | int err; |
| 820 | |
| 821 | err = at_send_command_full (command, NUMERIC, NULL, |
| 822 | NULL, 0, pp_outResponse); |
| 823 | |
| 824 | if (err == 0 && pp_outResponse != NULL |
| 825 | && (*pp_outResponse)->success > 0 |
| 826 | && (*pp_outResponse)->p_intermediates == NULL |
| 827 | ) { |
| 828 | /* successful command must have an intermediate response */ |
| 829 | at_response_free(*pp_outResponse); |
| 830 | *pp_outResponse = NULL; |
| 831 | return AT_ERROR_INVALID_RESPONSE; |
| 832 | } |
| 833 | |
| 834 | return err; |
| 835 | } |
| 836 | |
| 837 | |
| 838 | int at_send_command_sms (const char *command, |
| 839 | const char *pdu, |
| 840 | const char *responsePrefix, |
| 841 | ATResponse **pp_outResponse) |
| 842 | { |
| 843 | int err; |
| 844 | |
| 845 | err = at_send_command_full (command, SINGLELINE, responsePrefix, |
| 846 | pdu, 0, pp_outResponse); |
| 847 | |
| 848 | if (err == 0 && pp_outResponse != NULL |
| 849 | && (*pp_outResponse)->success > 0 |
| 850 | && (*pp_outResponse)->p_intermediates == NULL |
| 851 | ) { |
| 852 | /* successful command must have an intermediate response */ |
| 853 | at_response_free(*pp_outResponse); |
| 854 | *pp_outResponse = NULL; |
| 855 | return AT_ERROR_INVALID_RESPONSE; |
| 856 | } |
| 857 | |
| 858 | return err; |
| 859 | } |
| 860 | |
| 861 | |
| 862 | int at_send_command_multiline (const char *command, |
| 863 | const char *responsePrefix, |
| 864 | ATResponse **pp_outResponse) |
| 865 | { |
| 866 | int err; |
| 867 | |
| 868 | err = at_send_command_full (command, MULTILINE, responsePrefix, |
| 869 | NULL, 0, pp_outResponse); |
| 870 | |
| 871 | return err; |
| 872 | } |
| 873 | |
| 874 | |
| 875 | /** This callback is invoked on the command thread */ |
| 876 | void at_set_on_timeout(void (*onTimeout)(void)) |
| 877 | { |
| 878 | s_onTimeout = onTimeout; |
| 879 | } |
| 880 | |
| 881 | /** |
| 882 | * This callback is invoked on the reader thread (like ATUnsolHandler) |
| 883 | * when the input stream closes before you call at_close |
| 884 | * (not when you call at_close()) |
| 885 | * You should still call at_close() |
| 886 | */ |
| 887 | |
| 888 | void at_set_on_reader_closed(void (*onClose)(void)) |
| 889 | { |
| 890 | s_onReaderClosed = onClose; |
| 891 | } |
| 892 | |
| 893 | |
| 894 | /** |
| 895 | * Periodically issue an AT command and wait for a response. |
| 896 | * Used to ensure channel has start up and is active |
| 897 | */ |
| 898 | |
| 899 | int at_handshake() |
| 900 | { |
| 901 | int i; |
| 902 | int err = 0; |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 903 | bool inEmulator; |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 904 | |
| 905 | if (0 != pthread_equal(s_tid_reader, pthread_self())) { |
| 906 | /* cannot be called from reader thread */ |
| 907 | return AT_ERROR_INVALID_THREAD; |
| 908 | } |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 909 | inEmulator = isInEmulator(); |
| 910 | if (inEmulator) { |
| 911 | pthread_mutex_lock(&s_writeMutex); |
| 912 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 913 | pthread_mutex_lock(&s_commandmutex); |
| 914 | |
| 915 | for (i = 0 ; i < HANDSHAKE_RETRY_COUNT ; i++) { |
| 916 | /* some stacks start with verbose off */ |
| 917 | err = at_send_command_full_nolock ("ATE0Q0V1", NO_RESULT, |
| 918 | NULL, NULL, HANDSHAKE_TIMEOUT_MSEC, NULL); |
| 919 | |
| 920 | if (err == 0) { |
| 921 | break; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | if (err == 0) { |
| 926 | /* pause for a bit to let the input buffer drain any unmatched OK's |
| 927 | (they will appear as extraneous unsolicited responses) */ |
| 928 | |
| 929 | sleepMsec(HANDSHAKE_TIMEOUT_MSEC); |
| 930 | } |
| 931 | |
| 932 | pthread_mutex_unlock(&s_commandmutex); |
Weilun Du | 9f471e2 | 2017-02-07 10:47:19 -0800 | [diff] [blame] | 933 | if (inEmulator) { |
| 934 | pthread_mutex_unlock(&s_writeMutex); |
| 935 | } |
The Android Open Source Project | 00f06fc | 2009-03-03 19:32:15 -0800 | [diff] [blame] | 936 | |
| 937 | return err; |
| 938 | } |
| 939 | |
| 940 | /** |
| 941 | * Returns error code from response |
| 942 | * Assumes AT+CMEE=1 (numeric) mode |
| 943 | */ |
| 944 | AT_CME_Error at_get_cme_error(const ATResponse *p_response) |
| 945 | { |
| 946 | int ret; |
| 947 | int err; |
| 948 | char *p_cur; |
| 949 | |
| 950 | if (p_response->success > 0) { |
| 951 | return CME_SUCCESS; |
| 952 | } |
| 953 | |
| 954 | if (p_response->finalResponse == NULL |
| 955 | || !strStartsWith(p_response->finalResponse, "+CME ERROR:") |
| 956 | ) { |
| 957 | return CME_ERROR_NON_CME; |
| 958 | } |
| 959 | |
| 960 | p_cur = p_response->finalResponse; |
| 961 | err = at_tok_start(&p_cur); |
| 962 | |
| 963 | if (err < 0) { |
| 964 | return CME_ERROR_NON_CME; |
| 965 | } |
| 966 | |
| 967 | err = at_tok_nextint(&p_cur, &ret); |
| 968 | |
| 969 | if (err < 0) { |
| 970 | return CME_ERROR_NON_CME; |
| 971 | } |
| 972 | |
| 973 | return (AT_CME_Error) ret; |
| 974 | } |
| 975 | |