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1) generic digital or analog IOs to communicate with shutter, sensors, cameras (onboard IOs or the HSMC card with a daughter board);
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These sort of low level tasks may not be well suited for OpenCL, but it I'm not quite sure.
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2) asynchronous FIFO channels for buffering incoming data and transferring data to host;
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This will be extremely easy and convenient with OpenCL. The SDK will basically do all the work for you.
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3) interruptions or control signals that allow the host and the kernel to communicate with each other about their status (data transfer completed, acquisition finished, FIFO full, etc.).
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Communication between kernels is usually realized with the Altera channel extension for OpenCL. Communication with the host generally uses memory accesses. If you only have to synchronize host code with OpenCL kernel completion, there are function calls to do just that.
If you come from a VHDL/VERILOG background, let me just tell you that OpenCL for FPGAs is very very high level programming in comparison.
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