1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /* this implements a GPS hardware library for the Android emulator.
18 * the following code should be built as a shared library that will be
19 * placed into /system/lib/hw/gps.goldfish.so
20 *
21 * it will be loaded by the code in hardware/libhardware/hardware.c
22 * which is itself called from android_location_GpsLocationProvider.cpp
23 */
24
25
26 #include <errno.h>
27 #include <pthread.h>
28 #include <fcntl.h>
29 #include <sys/epoll.h>
30 #include <math.h>
31 #include <time.h>
32
33 #define LOG_TAG "gps_qemu"
34 #include <cutils/log.h>
35 #include <cutils/sockets.h>
36 #include <hardware/gps.h>
37 #include "qemu_pipe.h"
38
39 /* the name of the qemu-controlled pipe */
40 #define QEMU_CHANNEL_NAME "qemud:gps"
41
42 #define GPS_DEBUG 0
43
44 #if GPS_DEBUG
45 # define D(...) ALOGD(__VA_ARGS__)
46 #else
47 # define D(...) ((void)0)
48 #endif
49
50 /*****************************************************************/
51 /*****************************************************************/
52 /***** *****/
53 /***** N M E A T O K E N I Z E R *****/
54 /***** *****/
55 /*****************************************************************/
56 /*****************************************************************/
57
58 typedef struct {
59 const char* p;
60 const char* end;
61 } Token;
62
63 #define MAX_NMEA_TOKENS 16
64
65 typedef struct {
66 int count;
67 Token tokens[ MAX_NMEA_TOKENS ];
68 } NmeaTokenizer;
69
70 static int
nmea_tokenizer_init(NmeaTokenizer * t,const char * p,const char * end)71 nmea_tokenizer_init( NmeaTokenizer* t, const char* p, const char* end )
72 {
73 int count = 0;
74 char* q;
75
76 // the initial '$' is optional
77 if (p < end && p[0] == '$')
78 p += 1;
79
80 // remove trailing newline
81 if (end > p && end[-1] == '\n') {
82 end -= 1;
83 if (end > p && end[-1] == '\r')
84 end -= 1;
85 }
86
87 // get rid of checksum at the end of the sentecne
88 if (end >= p+3 && end[-3] == '*') {
89 end -= 3;
90 }
91
92 while (p < end) {
93 const char* q = p;
94
95 q = memchr(p, ',', end-p);
96 if (q == NULL)
97 q = end;
98
99 if (count < MAX_NMEA_TOKENS) {
100 t->tokens[count].p = p;
101 t->tokens[count].end = q;
102 count += 1;
103 }
104 if (q < end)
105 q += 1;
106
107 p = q;
108 }
109
110 t->count = count;
111 return count;
112 }
113
114 static Token
nmea_tokenizer_get(NmeaTokenizer * t,int index)115 nmea_tokenizer_get( NmeaTokenizer* t, int index )
116 {
117 Token tok;
118 static const char* dummy = "";
119
120 if (index < 0 || index >= t->count) {
121 tok.p = tok.end = dummy;
122 } else
123 tok = t->tokens[index];
124
125 return tok;
126 }
127
128
129 static int
str2int(const char * p,const char * end)130 str2int( const char* p, const char* end )
131 {
132 int result = 0;
133 int len = end - p;
134
135 for ( ; len > 0; len--, p++ )
136 {
137 int c;
138
139 if (p >= end)
140 goto Fail;
141
142 c = *p - '0';
143 if ((unsigned)c >= 10)
144 goto Fail;
145
146 result = result*10 + c;
147 }
148 return result;
149
150 Fail:
151 return -1;
152 }
153
154 static double
str2float(const char * p,const char * end)155 str2float( const char* p, const char* end )
156 {
157 int result = 0;
158 int len = end - p;
159 char temp[16];
160
161 if (len >= (int)sizeof(temp))
162 return 0.;
163
164 memcpy( temp, p, len );
165 temp[len] = 0;
166 return strtod( temp, NULL );
167 }
168
169 /*****************************************************************/
170 /*****************************************************************/
171 /***** *****/
172 /***** N M E A P A R S E R *****/
173 /***** *****/
174 /*****************************************************************/
175 /*****************************************************************/
176
177 #define NMEA_MAX_SIZE 83
178
179 typedef struct {
180 int pos;
181 int overflow;
182 int utc_year;
183 int utc_mon;
184 int utc_day;
185 int utc_diff;
186 GpsLocation fix;
187 gps_location_callback callback;
188 char in[ NMEA_MAX_SIZE+1 ];
189 } NmeaReader;
190
191
192 static void
nmea_reader_update_utc_diff(NmeaReader * r)193 nmea_reader_update_utc_diff( NmeaReader* r )
194 {
195 time_t now = time(NULL);
196 struct tm tm_local;
197 struct tm tm_utc;
198 long time_local, time_utc;
199
200 gmtime_r( &now, &tm_utc );
201 localtime_r( &now, &tm_local );
202
203 time_local = tm_local.tm_sec +
204 60*(tm_local.tm_min +
205 60*(tm_local.tm_hour +
206 24*(tm_local.tm_yday +
207 365*tm_local.tm_year)));
208
209 time_utc = tm_utc.tm_sec +
210 60*(tm_utc.tm_min +
211 60*(tm_utc.tm_hour +
212 24*(tm_utc.tm_yday +
213 365*tm_utc.tm_year)));
214
215 r->utc_diff = time_utc - time_local;
216 }
217
218
219 static void
nmea_reader_init(NmeaReader * r)220 nmea_reader_init( NmeaReader* r )
221 {
222 memset( r, 0, sizeof(*r) );
223
224 r->pos = 0;
225 r->overflow = 0;
226 r->utc_year = -1;
227 r->utc_mon = -1;
228 r->utc_day = -1;
229 r->callback = NULL;
230 r->fix.size = sizeof(r->fix);
231
232 nmea_reader_update_utc_diff( r );
233 }
234
235
236 static void
nmea_reader_set_callback(NmeaReader * r,gps_location_callback cb)237 nmea_reader_set_callback( NmeaReader* r, gps_location_callback cb )
238 {
239 r->callback = cb;
240 if (cb != NULL && r->fix.flags != 0) {
241 D("%s: sending latest fix to new callback", __FUNCTION__);
242 r->callback( &r->fix );
243 r->fix.flags = 0;
244 }
245 }
246
247
248 static int
nmea_reader_update_time(NmeaReader * r,Token tok)249 nmea_reader_update_time( NmeaReader* r, Token tok )
250 {
251 int hour, minute;
252 double seconds;
253 struct tm tm;
254 time_t fix_time;
255
256 if (tok.p + 6 > tok.end)
257 return -1;
258
259 if (r->utc_year < 0) {
260 // no date yet, get current one
261 time_t now = time(NULL);
262 gmtime_r( &now, &tm );
263 r->utc_year = tm.tm_year + 1900;
264 r->utc_mon = tm.tm_mon + 1;
265 r->utc_day = tm.tm_mday;
266 }
267
268 hour = str2int(tok.p, tok.p+2);
269 minute = str2int(tok.p+2, tok.p+4);
270 seconds = str2float(tok.p+4, tok.end);
271
272 tm.tm_hour = hour;
273 tm.tm_min = minute;
274 tm.tm_sec = (int) seconds;
275 tm.tm_year = r->utc_year - 1900;
276 tm.tm_mon = r->utc_mon - 1;
277 tm.tm_mday = r->utc_day;
278 tm.tm_isdst = -1;
279
280 // This is a little confusing, let's use an example:
281 // Suppose now it's 1970-1-1 01:00 GMT, local time is 1970-1-1 00:00 GMT-1
282 // Then the utc_diff is 3600.
283 // The time string from GPS is 01:00:00, mktime assumes it's a local
284 // time. So we are doing mktime for 1970-1-1 01:00 GMT-1. The result of
285 // mktime is 7200 (1970-1-1 02:00 GMT) actually. To get the correct
286 // timestamp, we have to subtract utc_diff here.
287 fix_time = mktime( &tm ) - r->utc_diff;
288 r->fix.timestamp = (long long)fix_time * 1000;
289 return 0;
290 }
291
292 static int
nmea_reader_update_date(NmeaReader * r,Token date,Token time)293 nmea_reader_update_date( NmeaReader* r, Token date, Token time )
294 {
295 Token tok = date;
296 int day, mon, year;
297
298 if (tok.p + 6 != tok.end) {
299 D("date not properly formatted: '%.*s'", tok.end-tok.p, tok.p);
300 return -1;
301 }
302 day = str2int(tok.p, tok.p+2);
303 mon = str2int(tok.p+2, tok.p+4);
304 year = str2int(tok.p+4, tok.p+6) + 2000;
305
306 if ((day|mon|year) < 0) {
307 D("date not properly formatted: '%.*s'", tok.end-tok.p, tok.p);
308 return -1;
309 }
310
311 r->utc_year = year;
312 r->utc_mon = mon;
313 r->utc_day = day;
314
315 return nmea_reader_update_time( r, time );
316 }
317
318
319 static double
convert_from_hhmm(Token tok)320 convert_from_hhmm( Token tok )
321 {
322 double val = str2float(tok.p, tok.end);
323 int degrees = (int)(floor(val) / 100);
324 double minutes = val - degrees*100.;
325 double dcoord = degrees + minutes / 60.0;
326 return dcoord;
327 }
328
329
330 static int
nmea_reader_update_latlong(NmeaReader * r,Token latitude,char latitudeHemi,Token longitude,char longitudeHemi)331 nmea_reader_update_latlong( NmeaReader* r,
332 Token latitude,
333 char latitudeHemi,
334 Token longitude,
335 char longitudeHemi )
336 {
337 double lat, lon;
338 Token tok;
339
340 tok = latitude;
341 if (tok.p + 6 > tok.end) {
342 D("latitude is too short: '%.*s'", tok.end-tok.p, tok.p);
343 return -1;
344 }
345 lat = convert_from_hhmm(tok);
346 if (latitudeHemi == 'S')
347 lat = -lat;
348
349 tok = longitude;
350 if (tok.p + 6 > tok.end) {
351 D("longitude is too short: '%.*s'", tok.end-tok.p, tok.p);
352 return -1;
353 }
354 lon = convert_from_hhmm(tok);
355 if (longitudeHemi == 'W')
356 lon = -lon;
357
358 r->fix.flags |= GPS_LOCATION_HAS_LAT_LONG;
359 r->fix.latitude = lat;
360 r->fix.longitude = lon;
361 return 0;
362 }
363
364
365 static int
nmea_reader_update_altitude(NmeaReader * r,Token altitude,Token __unused units)366 nmea_reader_update_altitude( NmeaReader* r,
367 Token altitude,
368 Token __unused units )
369 {
370 double alt;
371 Token tok = altitude;
372
373 if (tok.p >= tok.end)
374 return -1;
375
376 r->fix.flags |= GPS_LOCATION_HAS_ALTITUDE;
377 r->fix.altitude = str2float(tok.p, tok.end);
378 return 0;
379 }
380
381
382 static int
nmea_reader_update_bearing(NmeaReader * r,Token bearing)383 nmea_reader_update_bearing( NmeaReader* r,
384 Token bearing )
385 {
386 double alt;
387 Token tok = bearing;
388
389 if (tok.p >= tok.end)
390 return -1;
391
392 r->fix.flags |= GPS_LOCATION_HAS_BEARING;
393 r->fix.bearing = str2float(tok.p, tok.end);
394 return 0;
395 }
396
397
398 static int
nmea_reader_update_speed(NmeaReader * r,Token speed)399 nmea_reader_update_speed( NmeaReader* r,
400 Token speed )
401 {
402 double alt;
403 Token tok = speed;
404
405 if (tok.p >= tok.end)
406 return -1;
407
408 r->fix.flags |= GPS_LOCATION_HAS_SPEED;
409 r->fix.speed = str2float(tok.p, tok.end);
410 return 0;
411 }
412
413 static int
nmea_reader_update_accuracy(NmeaReader * r)414 nmea_reader_update_accuracy( NmeaReader* r )
415 {
416 // Always return 20m accuracy.
417 // Possibly parse it from the NMEA sentence in the future.
418 r->fix.flags |= GPS_LOCATION_HAS_ACCURACY;
419 r->fix.accuracy = 20;
420 return 0;
421 }
422
423
424 static void
nmea_reader_parse(NmeaReader * r)425 nmea_reader_parse( NmeaReader* r )
426 {
427 /* we received a complete sentence, now parse it to generate
428 * a new GPS fix...
429 */
430 NmeaTokenizer tzer[1];
431 Token tok;
432
433 D("Received: '%.*s'", r->pos, r->in);
434 if (r->pos < 9) {
435 D("Too short. discarded.");
436 return;
437 }
438
439 nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
440 #if GPS_DEBUG
441 {
442 int n;
443 D("Found %d tokens", tzer->count);
444 for (n = 0; n < tzer->count; n++) {
445 Token tok = nmea_tokenizer_get(tzer,n);
446 D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
447 }
448 }
449 #endif
450
451 tok = nmea_tokenizer_get(tzer, 0);
452 if (tok.p + 5 > tok.end) {
453 D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
454 return;
455 }
456
457 // ignore first two characters.
458 tok.p += 2;
459 if ( !memcmp(tok.p, "GGA", 3) ) {
460 // GPS fix
461 Token tok_time = nmea_tokenizer_get(tzer,1);
462 Token tok_latitude = nmea_tokenizer_get(tzer,2);
463 Token tok_latitudeHemi = nmea_tokenizer_get(tzer,3);
464 Token tok_longitude = nmea_tokenizer_get(tzer,4);
465 Token tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
466 Token tok_altitude = nmea_tokenizer_get(tzer,9);
467 Token tok_altitudeUnits = nmea_tokenizer_get(tzer,10);
468
469 nmea_reader_update_time(r, tok_time);
470 nmea_reader_update_latlong(r, tok_latitude,
471 tok_latitudeHemi.p[0],
472 tok_longitude,
473 tok_longitudeHemi.p[0]);
474 nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);
475
476 } else if ( !memcmp(tok.p, "GSA", 3) ) {
477 // do something ?
478 } else if ( !memcmp(tok.p, "RMC", 3) ) {
479 Token tok_time = nmea_tokenizer_get(tzer,1);
480 Token tok_fixStatus = nmea_tokenizer_get(tzer,2);
481 Token tok_latitude = nmea_tokenizer_get(tzer,3);
482 Token tok_latitudeHemi = nmea_tokenizer_get(tzer,4);
483 Token tok_longitude = nmea_tokenizer_get(tzer,5);
484 Token tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
485 Token tok_speed = nmea_tokenizer_get(tzer,7);
486 Token tok_bearing = nmea_tokenizer_get(tzer,8);
487 Token tok_date = nmea_tokenizer_get(tzer,9);
488
489 D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
490 if (tok_fixStatus.p[0] == 'A')
491 {
492 nmea_reader_update_date( r, tok_date, tok_time );
493
494 nmea_reader_update_latlong( r, tok_latitude,
495 tok_latitudeHemi.p[0],
496 tok_longitude,
497 tok_longitudeHemi.p[0] );
498
499 nmea_reader_update_bearing( r, tok_bearing );
500 nmea_reader_update_speed ( r, tok_speed );
501 }
502 } else {
503 tok.p -= 2;
504 D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
505 }
506
507 // Always update accuracy
508 nmea_reader_update_accuracy( r );
509
510 if (r->fix.flags != 0) {
511 #if GPS_DEBUG
512 char temp[256];
513 char* p = temp;
514 char* end = p + sizeof(temp);
515 struct tm utc;
516
517 p += snprintf( p, end-p, "sending fix" );
518 if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
519 p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
520 }
521 if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
522 p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
523 }
524 if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
525 p += snprintf(p, end-p, " speed=%g", r->fix.speed);
526 }
527 if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
528 p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
529 }
530 if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
531 p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
532 }
533 gmtime_r( (time_t*) &r->fix.timestamp, &utc );
534 p += snprintf(p, end-p, " time=%s", asctime( &utc ) );
535 D(temp);
536 #endif
537 if (r->callback) {
538 r->callback( &r->fix );
539 r->fix.flags = 0;
540 }
541 else {
542 D("no callback, keeping data until needed !");
543 }
544 }
545 }
546
547
548 static void
nmea_reader_addc(NmeaReader * r,int c)549 nmea_reader_addc( NmeaReader* r, int c )
550 {
551 if (r->overflow) {
552 r->overflow = (c != '\n');
553 return;
554 }
555
556 if (r->pos >= (int) sizeof(r->in)-1 ) {
557 r->overflow = 1;
558 r->pos = 0;
559 return;
560 }
561
562 r->in[r->pos] = (char)c;
563 r->pos += 1;
564
565 if (c == '\n') {
566 nmea_reader_parse( r );
567 r->pos = 0;
568 }
569 }
570
571
572 /*****************************************************************/
573 /*****************************************************************/
574 /***** *****/
575 /***** C O N N E C T I O N S T A T E *****/
576 /***** *****/
577 /*****************************************************************/
578 /*****************************************************************/
579
580 /* commands sent to the gps thread */
581 enum {
582 CMD_QUIT = 0,
583 CMD_START = 1,
584 CMD_STOP = 2
585 };
586
587
588 /* this is the state of our connection to the qemu_gpsd daemon */
589 typedef struct {
590 int init;
591 int fd;
592 GpsCallbacks callbacks;
593 pthread_t thread;
594 int control[2];
595 } GpsState;
596
597 static GpsState _gps_state[1];
598
599
600 static void
gps_state_done(GpsState * s)601 gps_state_done( GpsState* s )
602 {
603 // tell the thread to quit, and wait for it
604 char cmd = CMD_QUIT;
605 void* dummy;
606 write( s->control[0], &cmd, 1 );
607 pthread_join(s->thread, &dummy);
608
609 // close the control socket pair
610 close( s->control[0] ); s->control[0] = -1;
611 close( s->control[1] ); s->control[1] = -1;
612
613 // close connection to the QEMU GPS daemon
614 close( s->fd ); s->fd = -1;
615 s->init = 0;
616 }
617
618
619 static void
gps_state_start(GpsState * s)620 gps_state_start( GpsState* s )
621 {
622 char cmd = CMD_START;
623 int ret;
624
625 do { ret=write( s->control[0], &cmd, 1 ); }
626 while (ret < 0 && errno == EINTR);
627
628 if (ret != 1)
629 D("%s: could not send CMD_START command: ret=%d: %s",
630 __FUNCTION__, ret, strerror(errno));
631 }
632
633
634 static void
gps_state_stop(GpsState * s)635 gps_state_stop( GpsState* s )
636 {
637 char cmd = CMD_STOP;
638 int ret;
639
640 do { ret=write( s->control[0], &cmd, 1 ); }
641 while (ret < 0 && errno == EINTR);
642
643 if (ret != 1)
644 D("%s: could not send CMD_STOP command: ret=%d: %s",
645 __FUNCTION__, ret, strerror(errno));
646 }
647
648
649 static int
epoll_register(int epoll_fd,int fd)650 epoll_register( int epoll_fd, int fd )
651 {
652 struct epoll_event ev;
653 int ret, flags;
654
655 /* important: make the fd non-blocking */
656 flags = fcntl(fd, F_GETFL);
657 fcntl(fd, F_SETFL, flags | O_NONBLOCK);
658
659 ev.events = EPOLLIN;
660 ev.data.fd = fd;
661 do {
662 ret = epoll_ctl( epoll_fd, EPOLL_CTL_ADD, fd, &ev );
663 } while (ret < 0 && errno == EINTR);
664 return ret;
665 }
666
667
668 static int
epoll_deregister(int epoll_fd,int fd)669 epoll_deregister( int epoll_fd, int fd )
670 {
671 int ret;
672 do {
673 ret = epoll_ctl( epoll_fd, EPOLL_CTL_DEL, fd, NULL );
674 } while (ret < 0 && errno == EINTR);
675 return ret;
676 }
677
678 /* this is the main thread, it waits for commands from gps_state_start/stop and,
679 * when started, messages from the QEMU GPS daemon. these are simple NMEA sentences
680 * that must be parsed to be converted into GPS fixes sent to the framework
681 */
682 static void
gps_state_thread(void * arg)683 gps_state_thread( void* arg )
684 {
685 GpsState* state = (GpsState*) arg;
686 NmeaReader reader[1];
687 int epoll_fd = epoll_create(2);
688 int started = 0;
689 int gps_fd = state->fd;
690 int control_fd = state->control[1];
691
692 nmea_reader_init( reader );
693
694 // register control file descriptors for polling
695 epoll_register( epoll_fd, control_fd );
696 epoll_register( epoll_fd, gps_fd );
697
698 D("gps thread running");
699
700 // now loop
701 for (;;) {
702 struct epoll_event events[2];
703 int ne, nevents;
704
705 nevents = epoll_wait( epoll_fd, events, 2, -1 );
706 if (nevents < 0) {
707 if (errno != EINTR)
708 ALOGE("epoll_wait() unexpected error: %s", strerror(errno));
709 continue;
710 }
711 D("gps thread received %d events", nevents);
712 for (ne = 0; ne < nevents; ne++) {
713 if ((events[ne].events & (EPOLLERR|EPOLLHUP)) != 0) {
714 ALOGE("EPOLLERR or EPOLLHUP after epoll_wait() !?");
715 return;
716 }
717 if ((events[ne].events & EPOLLIN) != 0) {
718 int fd = events[ne].data.fd;
719
720 if (fd == control_fd)
721 {
722 char cmd = 255;
723 int ret;
724 D("gps control fd event");
725 do {
726 ret = read( fd, &cmd, 1 );
727 } while (ret < 0 && errno == EINTR);
728
729 if (cmd == CMD_QUIT) {
730 D("gps thread quitting on demand");
731 return;
732 }
733 else if (cmd == CMD_START) {
734 if (!started) {
735 D("gps thread starting location_cb=%p", state->callbacks.location_cb);
736 started = 1;
737 nmea_reader_set_callback( reader, state->callbacks.location_cb );
738 }
739 }
740 else if (cmd == CMD_STOP) {
741 if (started) {
742 D("gps thread stopping");
743 started = 0;
744 nmea_reader_set_callback( reader, NULL );
745 }
746 }
747 }
748 else if (fd == gps_fd)
749 {
750 char buff[32];
751 D("gps fd event");
752 for (;;) {
753 int nn, ret;
754
755 ret = read( fd, buff, sizeof(buff) );
756 if (ret < 0) {
757 if (errno == EINTR)
758 continue;
759 if (errno != EWOULDBLOCK)
760 ALOGE("error while reading from gps daemon socket: %s:", strerror(errno));
761 break;
762 }
763 D("received %d bytes: %.*s", ret, ret, buff);
764 for (nn = 0; nn < ret; nn++)
765 nmea_reader_addc( reader, buff[nn] );
766 }
767 D("gps fd event end");
768 }
769 else
770 {
771 ALOGE("epoll_wait() returned unkown fd %d ?", fd);
772 }
773 }
774 }
775 }
776 }
777
778
779 static void
gps_state_init(GpsState * state,GpsCallbacks * callbacks)780 gps_state_init( GpsState* state, GpsCallbacks* callbacks )
781 {
782 state->init = 1;
783 state->control[0] = -1;
784 state->control[1] = -1;
785 state->fd = -1;
786
787 state->fd = qemu_pipe_open(QEMU_CHANNEL_NAME);
788
789 if (state->fd < 0) {
790 D("no gps emulation detected");
791 return;
792 }
793
794 D("gps emulation will read from '%s' qemu pipe", QEMU_CHANNEL_NAME );
795
796 if ( socketpair( AF_LOCAL, SOCK_STREAM, 0, state->control ) < 0 ) {
797 ALOGE("could not create thread control socket pair: %s", strerror(errno));
798 goto Fail;
799 }
800
801 state->thread = callbacks->create_thread_cb( "gps_state_thread", gps_state_thread, state );
802
803 if ( !state->thread ) {
804 ALOGE("could not create gps thread: %s", strerror(errno));
805 goto Fail;
806 }
807
808 state->callbacks = *callbacks;
809
810 D("gps state initialized");
811 return;
812
813 Fail:
814 gps_state_done( state );
815 }
816
817
818 /*****************************************************************/
819 /*****************************************************************/
820 /***** *****/
821 /***** I N T E R F A C E *****/
822 /***** *****/
823 /*****************************************************************/
824 /*****************************************************************/
825
826
827 static int
qemu_gps_init(GpsCallbacks * callbacks)828 qemu_gps_init(GpsCallbacks* callbacks)
829 {
830 GpsState* s = _gps_state;
831
832 if (!s->init)
833 gps_state_init(s, callbacks);
834
835 if (s->fd < 0)
836 return -1;
837
838 return 0;
839 }
840
841 static void
qemu_gps_cleanup(void)842 qemu_gps_cleanup(void)
843 {
844 GpsState* s = _gps_state;
845
846 if (s->init)
847 gps_state_done(s);
848 }
849
850
851 static int
qemu_gps_start()852 qemu_gps_start()
853 {
854 GpsState* s = _gps_state;
855
856 if (!s->init) {
857 D("%s: called with uninitialized state !!", __FUNCTION__);
858 return -1;
859 }
860
861 D("%s: called", __FUNCTION__);
862 gps_state_start(s);
863 return 0;
864 }
865
866
867 static int
qemu_gps_stop()868 qemu_gps_stop()
869 {
870 GpsState* s = _gps_state;
871
872 if (!s->init) {
873 D("%s: called with uninitialized state !!", __FUNCTION__);
874 return -1;
875 }
876
877 D("%s: called", __FUNCTION__);
878 gps_state_stop(s);
879 return 0;
880 }
881
882
883 static int
qemu_gps_inject_time(GpsUtcTime __unused time,int64_t __unused timeReference,int __unused uncertainty)884 qemu_gps_inject_time(GpsUtcTime __unused time,
885 int64_t __unused timeReference,
886 int __unused uncertainty)
887 {
888 return 0;
889 }
890
891 static int
qemu_gps_inject_location(double __unused latitude,double __unused longitude,float __unused accuracy)892 qemu_gps_inject_location(double __unused latitude,
893 double __unused longitude,
894 float __unused accuracy)
895 {
896 return 0;
897 }
898
899 static void
qemu_gps_delete_aiding_data(GpsAidingData __unused flags)900 qemu_gps_delete_aiding_data(GpsAidingData __unused flags)
901 {
902 }
903
qemu_gps_set_position_mode(GpsPositionMode __unused mode,GpsPositionRecurrence __unused recurrence,uint32_t __unused min_interval,uint32_t __unused preferred_accuracy,uint32_t __unused preferred_time)904 static int qemu_gps_set_position_mode(GpsPositionMode __unused mode,
905 GpsPositionRecurrence __unused recurrence,
906 uint32_t __unused min_interval,
907 uint32_t __unused preferred_accuracy,
908 uint32_t __unused preferred_time)
909 {
910 // FIXME - support fix_frequency
911 return 0;
912 }
913
914 static const void*
qemu_gps_get_extension(const char * __unused name)915 qemu_gps_get_extension(const char* __unused name)
916 {
917 // no extensions supported
918 return NULL;
919 }
920
921 static const GpsInterface qemuGpsInterface = {
922 sizeof(GpsInterface),
923 qemu_gps_init,
924 qemu_gps_start,
925 qemu_gps_stop,
926 qemu_gps_cleanup,
927 qemu_gps_inject_time,
928 qemu_gps_inject_location,
929 qemu_gps_delete_aiding_data,
930 qemu_gps_set_position_mode,
931 qemu_gps_get_extension,
932 };
933
gps__get_gps_interface(struct gps_device_t * __unused dev)934 const GpsInterface* gps__get_gps_interface(struct gps_device_t* __unused dev)
935 {
936 return &qemuGpsInterface;
937 }
938
open_gps(const struct hw_module_t * module,char const * __unused name,struct hw_device_t ** device)939 static int open_gps(const struct hw_module_t* module,
940 char const* __unused name,
941 struct hw_device_t** device)
942 {
943 struct gps_device_t *dev = malloc(sizeof(struct gps_device_t));
944 memset(dev, 0, sizeof(*dev));
945
946 dev->common.tag = HARDWARE_DEVICE_TAG;
947 dev->common.version = 0;
948 dev->common.module = (struct hw_module_t*)module;
949 // dev->common.close = (int (*)(struct hw_device_t*))close_lights;
950 dev->get_gps_interface = gps__get_gps_interface;
951
952 *device = (struct hw_device_t*)dev;
953 return 0;
954 }
955
956
957 static struct hw_module_methods_t gps_module_methods = {
958 .open = open_gps
959 };
960
961 struct hw_module_t HAL_MODULE_INFO_SYM = {
962 .tag = HARDWARE_MODULE_TAG,
963 .version_major = 1,
964 .version_minor = 0,
965 .id = GPS_HARDWARE_MODULE_ID,
966 .name = "Goldfish GPS Module",
967 .author = "The Android Open Source Project",
968 .methods = &gps_module_methods,
969 };
970