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gps_msm7k.c
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gps_msm7k.c
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//code comes from qemu gps code
#include <errno.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <math.h>
#include <time.h>
#include <sys/time.h>
#define LOG_NDEBUG 1
#define LOG_TAG "gps_msm7k"
#include <cutils/log.h>
#include <cutils/sockets.h>
#include <cutils/array.h>
#include <hardware/gps.h>
#define XTRA_BLOCK_SIZE 400
#define GPS_DEBUG 0
#define XTRA_DEBUG 1
#if GPS_DEBUG
# define D(...) LOGD(__VA_ARGS__)
# define V(...) LOGV(__VA_ARGS__)
#else
# define D(...) ((void)0)
# define V(...) ((void)0)
#endif
#if XTRA_DEBUG
# define pr_dbg_xtra(...) LOGD(__VA_ARGS__)
#else
# define pr_dbg_xtra(...) ((void)0)
#endif
/* Functions from RPC driver */
extern void gps_get_position();
extern void exit_gps_rpc();
extern void start_gps_rpc();
extern int init_gps_rpc();
/*****************************************************************/
/*****************************************************************/
/***** *****/
/***** N M E A T O K E N I Z E R *****/
/***** *****/
/*****************************************************************/
/*****************************************************************/
/* this is the state of our connection */
typedef struct {
const char* p;
const char* end;
} Token;
#define MAX_NMEA_TOKENS 32
typedef struct {
int count;
Token tokens[ MAX_NMEA_TOKENS ];
} NmeaTokenizer;
static int
nmea_tokenizer_init( NmeaTokenizer* t, const char* p, const char* end )
{
int count = 0;
char* q;
// the initial '$' is optional
if (p < end && p[0] == '$')
p += 1;
// remove trailing newline
if (end > p && end[-1] == '\n') {
end -= 1;
if (end > p && end[-1] == '\r')
end -= 1;
}
// get rid of checksum at the end of the sentecne
if (end >= p+3 && end[-3] == '*') {
end -= 3;
}
while (p < end) {
const char* q = p;
q = memchr(p, ',', end-p);
if (q == NULL)
q = end;
if (count < MAX_NMEA_TOKENS) {
t->tokens[count].p = p;
t->tokens[count].end = q;
count += 1;
}
if (q < end)
q += 1;
p = q;
}
t->count = count;
return count;
}
static Token
nmea_tokenizer_get( NmeaTokenizer* t, int index )
{
Token tok;
static const char* dummy = "";
if (index < 0 || index >= t->count) {
tok.p = tok.end = dummy;
} else
tok = t->tokens[index];
return tok;
}
static int
str2int( const char* p, const char* end )
{
int result = 0;
int len = end - p;
for ( ; len > 0; len--, p++ )
{
int c;
if (p >= end)
goto Fail;
c = *p - '0';
if ((unsigned)c >= 10)
goto Fail;
result = result*10 + c;
}
return result;
Fail:
return -1;
}
static double
str2float( const char* p, const char* end )
{
int result = 0;
int len = end - p;
char temp[16];
if (len >= (int)sizeof(temp))
return 0.;
memcpy( temp, p, len );
temp[len] = 0;
return strtod( temp, NULL );
}
/*****************************************************************/
/*****************************************************************/
/***** *****/
/***** N M E A P A R S E R *****/
/***** *****/
/*****************************************************************/
/*****************************************************************/
#define NMEA_MAX_SIZE 255
typedef struct {
int pos;
int overflow;
int utc_year;
int utc_mon;
int utc_day;
int utc_diff;
GpsLocation fix;
GpsSvStatus sv_status;
char in[ NMEA_MAX_SIZE+1 ];
} NmeaReader;
enum update_event_type {
STATUS,
SV_STATUS,
LOCATION
};
typedef struct {
int type;
void* object;
} GpsUpdateEvent;
typedef struct {
int init;
int fd;
GpsCallbacks callbacks;
GpsXtraCallbacks xtra_callbacks;
AGpsCallbacks agps_callbacks;
int control[2];
pthread_t thread;
pthread_mutex_t update_mutex;
Array* update_events;
} GpsState;
static GpsState _gps_state[1];
static void
nmea_reader_update_utc_diff( NmeaReader* r )
{
time_t now = time(NULL);
struct tm tm_local;
struct tm tm_utc;
long time_local, time_utc;
gmtime_r( &now, &tm_utc );
localtime_r( &now, &tm_local );
time_local = tm_local.tm_sec +
60*(tm_local.tm_min +
60*(tm_local.tm_hour +
24*(tm_local.tm_yday +
365*tm_local.tm_year)));
time_utc = tm_utc.tm_sec +
60*(tm_utc.tm_min +
60*(tm_utc.tm_hour +
24*(tm_utc.tm_yday +
365*tm_utc.tm_year)));
r->utc_diff = time_utc - time_local;
}
static void
nmea_reader_init( NmeaReader* r )
{
memset( r, 0, sizeof(*r) );
r->pos = 0;
r->overflow = 0;
r->utc_year = -1;
r->utc_mon = -1;
r->utc_day = -1;
nmea_reader_update_utc_diff( r );
}
static int
nmea_reader_update_time( NmeaReader* r, Token tok )
{
int hour, minute;
double seconds;
struct tm tm;
time_t fix_time;
if (tok.p + 6 > tok.end)
return -1;
if (r->utc_year < 0) {
// no date yet, get current one
time_t now = time(NULL);
gmtime_r( &now, &tm );
r->utc_year = tm.tm_year + 1900;
r->utc_mon = tm.tm_mon + 1;
r->utc_day = tm.tm_mday;
}
hour = str2int(tok.p, tok.p+2);
minute = str2int(tok.p+2, tok.p+4);
seconds = str2float(tok.p+4, tok.end);
tm.tm_hour = hour;
tm.tm_min = minute;
tm.tm_sec = (int) seconds;
tm.tm_year = r->utc_year - 1900;
tm.tm_mon = r->utc_mon - 1;
tm.tm_mday = r->utc_day;
tm.tm_isdst = -1;
fix_time = mktime( &tm ) + r->utc_diff;
r->fix.timestamp = (long long)fix_time * 1000+(int)(seconds*1000)%1000;
return 0;
}
static int
nmea_reader_update_date( NmeaReader* r, Token date, Token time )
{
Token tok = date;
int day, mon, year;
if (tok.p + 6 != tok.end) {
D("date not properly formatted: '%.*s'", tok.end-tok.p, tok.p);
return -1;
}
day = str2int(tok.p, tok.p+2);
mon = str2int(tok.p+2, tok.p+4);
year = str2int(tok.p+4, tok.p+6) + 2000;
if ((day|mon|year) < 0) {
D("date not properly formatted: '%.*s'", tok.end-tok.p, tok.p);
return -1;
}
r->utc_year = year;
r->utc_mon = mon;
r->utc_day = day;
return nmea_reader_update_time( r, time );
}
static double
convert_from_hhmm( Token tok )
{
double val = str2float(tok.p, tok.end);
int degrees = (int)(floor(val) / 100);
double minutes = val - degrees*100.;
double dcoord = degrees + minutes / 60.0;
return dcoord;
}
static int
nmea_reader_update_latlong( NmeaReader* r,
Token latitude,
char latitudeHemi,
Token longitude,
char longitudeHemi )
{
double lat, lon;
Token tok;
tok = latitude;
if (tok.p + 6 > tok.end) {
D("latitude is too short: '%.*s'", tok.end-tok.p, tok.p);
return -1;
}
lat = convert_from_hhmm(tok);
if (latitudeHemi == 'S')
lat = -lat;
tok = longitude;
if (tok.p + 6 > tok.end) {
D("longitude is too short: '%.*s'", tok.end-tok.p, tok.p);
return -1;
}
lon = convert_from_hhmm(tok);
if (longitudeHemi == 'W')
lon = -lon;
r->fix.flags |= GPS_LOCATION_HAS_LAT_LONG;
r->fix.latitude = lat;
r->fix.longitude = lon;
return 0;
}
static int
nmea_reader_update_altitude( NmeaReader* r,
Token altitude,
Token units )
{
double alt;
Token tok = altitude;
if (tok.p >= tok.end)
return -1;
r->fix.flags |= GPS_LOCATION_HAS_ALTITUDE;
r->fix.altitude = str2float(tok.p, tok.end);
return 0;
}
static int
nmea_reader_update_bearing( NmeaReader* r,
Token bearing )
{
double alt;
Token tok = bearing;
if (tok.p >= tok.end)
return -1;
r->fix.flags |= GPS_LOCATION_HAS_BEARING;
r->fix.bearing = str2float(tok.p, tok.end);
return 0;
}
static int
nmea_reader_update_speed( NmeaReader* r,
Token speed )
{
double alt;
Token tok = speed;
if (tok.p >= tok.end)
return -1;
r->fix.flags |= GPS_LOCATION_HAS_SPEED;
r->fix.speed = str2float(tok.p, tok.end);
return 0;
}
static void
nmea_reader_parse( NmeaReader* r )
{
/* we received a complete sentence, now parse it to generate
* a new GPS fix...
*/
NmeaTokenizer tzer[1];
Token tok;
int i;
D("Received: '%.*s'", r->pos, r->in);
if (r->pos < 9) {
D("Too short. discarded.");
return;
}
{
struct timeval tv;
gettimeofday(&tv, NULL);
_gps_state->callbacks.nmea_cb(tv.tv_sec*1000+tv.tv_usec/1000, r->in, r->pos);
}
nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#if GPS_DEBUG
{
int n;
D("Found %d tokens", tzer->count);
for (n = 0; n < tzer->count; n++) {
Token tok = nmea_tokenizer_get(tzer,n);
D("size of %2d: '%d', ptr=%x", n, tok.end-tok.p, (unsigned int)tok.p);
D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
}
}
#endif
tok = nmea_tokenizer_get(tzer, 0);
if (tok.p + 5 > tok.end) {
D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
return;
}
// ignore first two characters.
tok.p += 2;
if ( !memcmp(tok.p, "GGA", 3) ) {
// GPS fix
Token tok_time = nmea_tokenizer_get(tzer,1);
Token tok_latitude = nmea_tokenizer_get(tzer,2);
Token tok_latitudeHemi = nmea_tokenizer_get(tzer,3);
Token tok_longitude = nmea_tokenizer_get(tzer,4);
Token tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
Token tok_altitude = nmea_tokenizer_get(tzer,9);
Token tok_altitudeUnits = nmea_tokenizer_get(tzer,10);
nmea_reader_update_time(r, tok_time);
nmea_reader_update_latlong(r, tok_latitude,
tok_latitudeHemi.p[0],
tok_longitude,
tok_longitudeHemi.p[0]);
nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);
} else if ( !memcmp(tok.p, "GSA", 3) ) {
//Satellites are handled by RPC-side code.
} else if ( !memcmp(tok.p, "GSV", 3) ) {
//Satellites are handled by RPC-side code.
} else if ( !memcmp(tok.p, "RMC", 3) ) {
Token tok_time = nmea_tokenizer_get(tzer,1);
Token tok_fixStatus = nmea_tokenizer_get(tzer,2);
Token tok_latitude = nmea_tokenizer_get(tzer,3);
Token tok_latitudeHemi = nmea_tokenizer_get(tzer,4);
Token tok_longitude = nmea_tokenizer_get(tzer,5);
Token tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
Token tok_speed = nmea_tokenizer_get(tzer,7);
Token tok_bearing = nmea_tokenizer_get(tzer,8);
Token tok_date = nmea_tokenizer_get(tzer,9);
D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
if (tok_fixStatus.p[0] == 'A')
{
nmea_reader_update_date( r, tok_date, tok_time );
nmea_reader_update_latlong( r, tok_latitude,
tok_latitudeHemi.p[0],
tok_longitude,
tok_longitudeHemi.p[0] );
nmea_reader_update_bearing( r, tok_bearing );
nmea_reader_update_speed ( r, tok_speed );
}
} else {
tok.p -= 2;
D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
}
if (r->fix.flags != 0) {
#if GPS_DEBUG
char temp[256];
char* p = temp;
char* end = p + sizeof(temp);
struct tm utc;
p += snprintf( p, end-p, "sending fix" );
if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
}
if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
}
if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
p += snprintf(p, end-p, " speed=%g", r->fix.speed);
}
if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
}
if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
}
gmtime_r( (time_t*) &r->fix.timestamp, &utc );
p += snprintf(p, end-p, " time=%s", asctime( &utc ) );
D("%s", temp);
#endif
if (_gps_state->callbacks.location_cb) {
_gps_state->callbacks.location_cb( &r->fix );
r->fix.flags = 0;
}
else {
D("no callback, keeping data until needed !");
}
}
}
static void
nmea_reader_addc( NmeaReader* r, int c )
{
if (r->overflow) {
r->overflow = (c != '\n');
return;
}
if (r->pos >= (int) sizeof(r->in)-1 ) {
r->overflow = 1;
r->pos = 0;
return;
}
r->in[r->pos] = (char)c;
r->pos += 1;
if (c == '\n') {
nmea_reader_parse( r );
r->pos = 0;
}
}
/*****************************************************************/
/*****************************************************************/
/***** *****/
/***** C O N N E C T I O N S T A T E *****/
/***** *****/
/*****************************************************************/
/*****************************************************************/
/* commands sent to the gps thread */
enum state_thread_cmd {
CMD_QUIT = 0,
CMD_START = 1,
CMD_STOP = 2,
CMD_SEND = 3,
CMD_PAUSE = 4,
CMD_RESUME = 5
};
static void gps_state_thread_ctl(GpsState* state, enum state_thread_cmd val) {
char cmd = (char)val;
int ret;
V("%s: command %d", __func__, val);
do { ret=write( state->control[0], &cmd, 1 ); }
while (ret < 0 && errno == EINTR);
if (ret != 1)
LOGE("%s: could not send command %d: ret=%d: %s", __func__, val, ret,
strerror(errno));
}
static int epoll_register( int epoll_fd, int fd ) {
struct epoll_event ev;
int ret, flags;
/* important: make the fd non-blocking */
flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
ev.events = EPOLLIN;
ev.data.fd = fd;
do {
ret = epoll_ctl( epoll_fd, EPOLL_CTL_ADD, fd, &ev );
} while (ret < 0 && errno == EINTR);
return ret;
}
static int epoll_deregister( int epoll_fd, int fd ) {
int ret;
do {
ret = epoll_ctl( epoll_fd, EPOLL_CTL_DEL, fd, NULL );
} while (ret < 0 && errno == EINTR);
return ret;
}
void enqueue_update_event(void* object, enum update_event_type type) {
GpsState* state = _gps_state;
if (!state->init) {
/* There's some sparse events coming in from the rpc system after
* the state thread has been stopped. We just ignore these.
*/
V("%s: gps state not initialized. Won't enqueue event type %d!",
__func__, type);
free(object);
return;
}
GpsUpdateEvent* event = malloc(sizeof(GpsUpdateEvent));
event->type = type;
event->object = object;
pthread_mutex_lock(&state->update_mutex);
arrayAdd(state->update_events, event);
pthread_mutex_unlock(&state->update_mutex);
gps_state_thread_ctl(state, CMD_SEND);
}
void update_gps_status(GpsStatusValue val) {
V("%s", __func__);
GpsStatus* status = malloc(sizeof(GpsStatus));
status->size = sizeof(GpsStatus);
status->status = val;
enqueue_update_event(status, STATUS);
}
void update_gps_svstatus(GpsSvStatus *val) {
V("%s", __func__);
GpsSvStatus* sv_status = malloc(sizeof(GpsSvStatus));
memcpy(sv_status, val, sizeof(GpsSvStatus));
sv_status->size = sizeof(GpsSvStatus);
enqueue_update_event(sv_status, SV_STATUS);
}
void update_gps_location(GpsLocation *fix) {
V("%s", __func__);
GpsLocation* location = malloc(sizeof(GpsLocation));
memcpy(location, fix, sizeof(GpsLocation));
location->size = sizeof(GpsLocation);
enqueue_update_event(location, LOCATION);
}
static void send_update_events(GpsState* state) {
int event_size;
pthread_mutex_lock(&state->update_mutex);
event_size = arraySize(state->update_events);
if (!event_size) {
pthread_mutex_unlock(&state->update_mutex);
return;
}
do {
GpsUpdateEvent* event = arrayRemove(state->update_events, 0);
switch (event->type) {
case STATUS: {
if (state->callbacks.status_cb) {
D("%s: sending STATUS event (status=%d)", __func__,
((GpsStatus*)event->object)->status);
state->callbacks.status_cb(event->object);
}
break;
}
case SV_STATUS: {
if (state->callbacks.sv_status_cb) {
D("%s: sending SV_STATUS event (num_svs=%d)", __func__,
((GpsSvStatus*)event->object)->num_svs);
state->callbacks.sv_status_cb(event->object);
}
break;
}
case LOCATION: {
if (state->callbacks.location_cb) {
D("%s: sending LOCATION event (flags=0x%x)", __func__,
((GpsLocation*)event->object)->flags);
state->callbacks.location_cb(event->object);
}
break;
}
default: {
D("%s: unknown event type %d", __func__, event->type);
}
}
free(event->object);
free(event);
--event_size;
} while (event_size > 0);
pthread_mutex_unlock(&state->update_mutex);
}
/* this is the main thread, it waits for commands from gps_state_thread_ctl() and,
* when started, messages from the NMEA SMD. these are simple NMEA sentences
* that must be parsed to be converted into GPS fixes sent to the framework
*/
uint32_t scan_interval = 0;
static void gps_state_thread( void* arg ) {
GpsState* state = (GpsState*) arg;
NmeaReader reader[1];
int epoll_fd = epoll_create(2);
int started = 0;
int paused = 0;
int gps_fd = state->fd;
int control_fd = state->control[1];
// Engine is enabled when the thread is started.
GpsStatus gps_status;
memset(&gps_status, 0, sizeof(GpsStatus));
gps_status.size = sizeof(GpsStatus);
gps_status.status = GPS_STATUS_ENGINE_ON;
if(state->callbacks.status_cb)
state->callbacks.status_cb(&gps_status);
nmea_reader_init( reader );
// register control file descriptors for polling
epoll_register( epoll_fd, control_fd );
if (gps_fd > -1) {
epoll_register( epoll_fd, gps_fd );
}
D("%s: start tid=%d", __func__, gettid());
// now loop
for (;;) {
struct epoll_event events[2];
int ne, nevents;
nevents = epoll_wait( epoll_fd, events, gps_fd>-1 ? 2 : 1,
started ? (int)scan_interval : -1);
if (nevents < 0) {
if (errno != EINTR)
LOGE("epoll_wait() unexpected error: %s", strerror(errno));
continue;
}
for (ne = 0; ne < nevents; ne++) {
if ((events[ne].events & (EPOLLERR|EPOLLHUP)) != 0) {
LOGE("EPOLLERR or EPOLLHUP after epoll_wait() !?");
goto Exit;
}
if ((events[ne].events & EPOLLIN) != 0) {
int fd = events[ne].data.fd;
if (fd == control_fd) {
int ret;
int i;
char buf[255];
int update_handled = 0;
memset(buf, 0xff, 255);
V("%s: control fd event", __func__);
do {
ret = read(fd, buf, 255);
} while (ret < 0 && errno == EINTR);
for (i = 0; i < ret && buf[i] != 0xff; i++) {
char cmd = buf[i];
V("%s: handling cmd=%d\n", __func__, cmd);
if (cmd == CMD_QUIT) {
V("%s: quit", __func__);
gps_status.status = GPS_STATUS_ENGINE_OFF;
if(state->callbacks.status_cb)
state->callbacks.status_cb(&gps_status);
goto Exit;
} else if (cmd == CMD_START) {
if (!started) {
V("%s: start", __func__);
started = 1;
start_gps_rpc();
}
} else if (cmd == CMD_PAUSE) {
paused = 1;
} else if (cmd == CMD_RESUME) {
paused = 0;
} else if (cmd == CMD_STOP) {
if (started) {
V("%s: stop", __func__);
started = 0;
exit_gps_rpc();
}
} else if (cmd == CMD_SEND) {
/* Don't try sending update events when we already
* have in this run.
*/
if (!update_handled) {
send_update_events(state);
update_handled = 1;
}
}
}
} else if (fd == gps_fd) {
char buff[32];
D("gps fd event");
for (;;) {
int nn, ret;
ret = read( fd, buff, sizeof(buff) );
if (ret < 0) {
if (errno == EINTR)
continue;
if (errno != EWOULDBLOCK)
LOGE("error while reading from gps daemon socket: %s:", strerror(errno));
break;
}
D("received %d bytes: %.*s", ret, ret, buff);
for (nn = 0; nn < ret; nn++)
nmea_reader_addc( reader, buff[nn] );
}
D("gps fd event end");
} else {
LOGE("epoll_wait() returned unkown fd %d ?", fd);
}
}
}
if (started && !paused) {
gps_get_position();
}
}
Exit:
D("%s: exit tid=%d", __func__, gettid());
return;
}
static void gps_state_deinit(GpsState*);
static void gps_state_init(GpsState* state) {
state->init = 1;
state->control[0] = -1;
state->control[1] = -1;
state->fd = -1; // open("/dev/smd27", O_RDONLY );
state->update_events = arrayCreate();
pthread_mutex_init(&state->update_mutex, NULL);
if ( socketpair( AF_LOCAL, SOCK_STREAM, 0, state->control ) < 0 ) {
LOGE("%s: could not create thread control socket pair: %s", __func__,
strerror(errno));
goto Fail;
}
state->thread = state->callbacks.create_thread_cb("gps_xdandroid",
gps_state_thread, state);
if (!state->thread) {
state->thread = 0;
LOGE("%s could not create gps state thread: %s", __func__,
strerror(errno));
goto Fail;
}
if(init_gps_rpc())
goto Fail;
D("%s: done", __func__);
return;
Fail:
gps_state_deinit( state );
}
static void gps_state_deinit(GpsState* state) {
GpsUpdateEvent* event;
D("%s", __func__);
// tell the thread to quit, and wait for it
gps_state_thread_ctl(state, CMD_QUIT);
pthread_join(state->thread, NULL);
// close the control socket pair
close(state->control[0]);
state->control[0] = -1;
close(state->control[1]);
state->control[1] = -1;
// close connection to the QEMU GPS daemon
close(state->fd);
state->fd = -1;
state->init = 0;
// cleanup
pthread_mutex_lock(&state->update_mutex);
// free any pending events
while (arraySize(state->update_events)) {
event = arrayRemove(state->update_events, 0);
free(event->object);
free(event);
}
arrayFree(state->update_events);
state->update_events = NULL;
pthread_mutex_unlock(&state->update_mutex);
pthread_mutex_destroy(&state->update_mutex);
}
/*****************************************************************/
/*****************************************************************/
/***** *****/
/***** I N T E R F A C E *****/
/***** *****/
/*****************************************************************/
/*****************************************************************/
/***** GpsXtraInterface *****/
static int gps_xtra_init(GpsXtraCallbacks* callbacks) {
pr_dbg_xtra("%s() is called", __func__);
GpsState* s = _gps_state;
s->xtra_callbacks = *callbacks;
return 0;
}
static int gps_xtra_inject_xtra_data(char* data, int length) {
pr_dbg_xtra("%s(): xtra size = %d, data ptr = 0x%x\n", __func__, length, (int) data);
GpsState* s = _gps_state;
if (!s->init)
return 0;
gps_state_thread_ctl(s, CMD_PAUSE);
int rpc_ret_val = -1;
int ret_val = -1;
unsigned char *xtra_data_ptr;
uint32_t part_len;
uint8_t part;
uint8_t total_parts;
uint16_t len_injected;
total_parts = (length / XTRA_BLOCK_SIZE);
if ((total_parts % XTRA_BLOCK_SIZE) != 0)
{
total_parts += 1;
}
len_injected = 0; // O bytes injected
// XTRA injection starts with part 1
for (part = 1; part <= total_parts; part++)
{
part_len = XTRA_BLOCK_SIZE;
if (XTRA_BLOCK_SIZE > (length - len_injected))
{
part_len = length - len_injected;
}
xtra_data_ptr = data + len_injected;
#if 0
pr_dbg_xtra("%s(): inject part = %d/%d, len = %d\n", __func__, part, total_parts, part_len);
#endif
if (part < total_parts)
{
rpc_ret_val = gps_xtra_set_data(xtra_data_ptr, part_len, part, total_parts);
if (!rpc_ret_val)
{
LOGE("gps_xtra_set_data() for xtra returned %d, part=%d/%d, len=%d; aborting! \n", rpc_ret_val, part, total_parts, part_len);
ret_val = EINVAL; // return error
break;
}
}
else // part == total_parts
{
ret_val = gps_xtra_set_data(xtra_data_ptr, part_len, part, total_parts);
break; // done with injection
}
len_injected += part_len;
}
gps_state_thread_ctl(s, CMD_RESUME);
return ret_val;
}