Hi,
1. Get the port handle of the target block. (in this example, MATLAB Funciton)
2. Get the line handle of the connected signal line from the obtained port handle.
3. Get the source block handle of the connection source from the obtained line handle.
4. Get the block properties from the obtained source block handle.
mlBlockPath = 'sample/MATLAB Function';
% get port Handle of MATLAB Function.
mlfPh = get_param(mlBlockPath,'PortHandles');
% get line handle of input signal.
inLine = get_param(mlfPh.Inport,'Line');
% get source block handle(In this case the inport block).
srcBlkH = get_param(inLine,'SrcBlockHandle');
% get source block name
blockName = get_param(srcBlkH,'Name');
