int cpi_open( void **cpi_data, unicap_device_t *device )
{
dcam_handle_t dcamhandle;
unicap_status_t status;
int port, node, directory;
int i_tmp;
char *env;
int is_initializing;
struct timeval init_timeout;
*cpi_data = malloc( sizeof( struct _dcam_handle ) );
if( !*cpi_data )
{
return STATUS_NO_MEM;
}
dcamhandle = (dcam_handle_t) *cpi_data;
memset( dcamhandle, 0x0, sizeof( struct _dcam_handle ) );
TIME("dcam_find_device",
{
status = _dcam_find_device( device, &port, &node, &directory );
if( !SUCCESS( status ) )
{
TRACE( "cpi_open: Could not find device\n" );
free( *cpi_data );
return status;
}
}
/*
bus reset handler checks if device is still on the bus.
if it is removed
-> set device_present to 0 . bandwidth and channel are remotely freed on bus reset
if device still present
-> reallocate bw and channel
-> channel is not guarranted to be the same after reallocation -> set new channel to camera if changed
*/
int dcam_busreset_handler( raw1394handle_t raw1394handle, unsigned int generation )
{
dcam_handle_t dcamhandle = ( dcam_handle_t ) raw1394_get_userdata( raw1394handle );
int port;
int channel;
raw1394_update_generation( raw1394handle, generation );
// check if the device is still there or if it has changed
if( _dcam_find_device( &dcamhandle->unicap_device,
&port,
&dcamhandle->node,
&dcamhandle->directory ) != STATUS_SUCCESS )
{
dcamhandle->device_present = 0;
dcam_device_removed_event( dcamhandle );
return 0;
}
// what happens if a PC-Card is removed ? does this change the port???
if( port != dcamhandle->port )
{
if( raw1394_set_port( raw1394handle, port ) < 0 )
{
dcamhandle->device_present = 0;
dcam_device_removed_event( dcamhandle );
return 0;
}
dcamhandle->port = port;
}
// reallocate bandwidth
// ( reallocation should always succeed )
if( dcamhandle->allocate_bandwidth )
{
if( !SUCCESS(_1394util_allocate_bandwidth( dcamhandle->raw1394handle, dcam_isoch_table[dcamhandle->current_iso_index].bytes_per_packet ) ) )
{
TRACE( "dcam.cpi: failed to reallocate bandwidth\n" );
dcam_capture_stop( dcamhandle );
return 0;
}
}
// channel is freed on busreset
// -> reallocate channel
// check if newly allocated channel matches previous channel
// -> conditionaly set new channel on the camera
if( !SUCCESS(_1394util_allocate_channel(dcamhandle->raw1394handle, dcamhandle->channel_allocated ) ) )
{
if( ( channel = _1394util_find_free_channel( dcamhandle->raw1394handle ) ) < 0 )
{
TRACE( "dcam.cpi: failed to allocate channel\n");
_1394util_free_bandwidth( dcamhandle->raw1394handle, dcam_isoch_table[dcamhandle->current_iso_index].bytes_per_packet );
dcam_capture_stop( dcamhandle );
return 0;
}
if( channel != dcamhandle->channel_allocated )
{
quadlet_t quad = 0;
if( dcam_isoch_table[dcamhandle->current_iso_index].min_speed <= S400 )
{
quad = ( channel << 28 ) | ( S400 << 24 );
}
else
{
quad = ( channel << 28 ) |
( dcam_isoch_table[dcamhandle->current_iso_index].min_speed << 24 );
}
if( _dcam_write_register( dcamhandle->raw1394handle,
dcamhandle->node,
dcamhandle->command_regs_base + 0x60c,
quad ) < 0 )
{
_1394util_free_channel( dcamhandle->raw1394handle,
channel );
_1394util_free_bandwidth( dcamhandle->raw1394handle,
dcam_isoch_table[dcamhandle->current_iso_index].bytes_per_packet );
return 0;
}
}
}
return 0;
}