int
main (int argc, char *argv[])
{
static const struct option options[] = {
{"help", no_argument, NULL, 'h'},
{}
};
int fd = 0;
char *device;
struct v4l2_capability v2cap;
char cap_str[4097];
memset (cap_str, 0, 4097);
for (;;)
{
int option;
option = getopt_long (argc, argv, "h", options, NULL);
if (option == -1)
{
break;
}
switch (option)
{
case 'h':
printf ("%s [-h,--help] <device file>\n\n"
"Video4Linux device identification.\n\n"
" -h Print this message\n", argv[0]);
return 0;
default:
return 1;
}
}
device = argv[optind];
if (device == NULL)
{
return 2;
}
fd = open (device, O_RDONLY);
if (fd < 0)
{
return 3;
}
if (ioctl (fd, VIDIOC_QUERYCAP, &v2cap) == 0)
{
vdev_property_add ("VDEV_V4L_VERSION", "2");
vdev_property_add ("VDEV_V4L_PRODUCT", (char *) v2cap.card);
strcat (cap_str, ":");
if ((v2cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0)
{
strcat (cap_str, "capture:");
}
if ((v2cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0)
{
strcat (cap_str, "video_output:");
}
if ((v2cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
{
strcat (cap_str, "video_overlay:");
}
if ((v2cap.capabilities & V4L2_CAP_AUDIO) > 0)
{
strcat (cap_str, "audio:");
}
if ((v2cap.capabilities & V4L2_CAP_TUNER) > 0)
{
strcat (cap_str, "tuner:");
}
if ((v2cap.capabilities & V4L2_CAP_RADIO) > 0)
{
strcat (cap_str, "radio:");
}
vdev_property_add ("VDEV_V4L_CAPABILITIES", cap_str);
}
close (fd);
vdev_property_print ();
vdev_property_free_all ();
return 0;
}
int main( int argc, char** argv ) {
if( argc != 2 ) {
usage( argv[0] );
}
char* next_bus = NULL;
char subsystem_list[ 4097 ];
char subsystem_list_uniq[ 4097 ];
char* delim = NULL;
char* subsystem_buf = (char*)calloc( strlen(argv[1]) + strlen("/subsystem") + 1, 1 );
char readlink_buf[ 4097 ];
int rc = 0;
struct stat sb;
if( subsystem_buf == NULL ) {
exit(1);
}
next_bus = argv[1];
memset( subsystem_list, 0, 4097 );
memset( subsystem_list_uniq, 0, 4097 );
// directory must exist
rc = stat( next_bus, &sb );
if( rc != 0 ) {
exit(1);
}
while( 1 ) {
// what's the subsystem here?
sprintf( subsystem_buf, "%s/subsystem", next_bus );
rc = lstat( subsystem_buf, &sb );
if( rc != 0 ) {
rc = remove_child( next_bus );
if( rc != 0 ) {
break;
}
else {
continue;
}
}
if( !S_ISLNK( sb.st_mode ) ) {
rc = remove_child( next_bus );
if( rc != 0 ) {
break;
}
else {
continue;
}
}
memset( readlink_buf, 0, 4097 );
rc = readlink( subsystem_buf, readlink_buf, 4096 );
if( rc < 0 ) {
rc = remove_child( next_bus );
if( rc != 0 ) {
break;
}
else {
continue;
}
}
delim = strrchr( readlink_buf, '/' );
if( delim == NULL ) {
rc = remove_child( next_bus );
if( rc != 0 ) {
break;
}
else {
continue;
}
}
// delim + 1 is the subsystem name
if( subsystem_list[0] != 0 ) {
strncat( subsystem_list, ",", 4096 - strlen(subsystem_list) - 1 );
}
strncat( subsystem_list, delim + 1, 4096 - strlen(subsystem_list) - 1 );
if( strstr( subsystem_list_uniq, delim + 1 ) == NULL ) {
// haven't seen this subsystem name before...
if( subsystem_list_uniq[0] != 0 ) {
strncat( subsystem_list_uniq, ",", 4096 - strlen(subsystem_list_uniq) - 1 );
}
strncat( subsystem_list_uniq, delim + 1, 4096 - strlen(subsystem_list_uniq) - 1 );
}
rc = remove_child( next_bus );
if( rc != 0 ) {
break;
}
else {
continue;
}
}
free( subsystem_buf );
vdev_property_add( "VDEV_BUS_SUBSYSTEMS", subsystem_list );
vdev_property_add( "VDEV_BUS_SUBSYSTEMS_UNIQ", subsystem_list_uniq );
vdev_property_print();
vdev_property_free_all();
exit(0);
}