Krzysztof Halasa wrote: > Mauro Carvalho Chehab <mche...@redhat.com> writes: > >>> What is the interface for attaching an in-kernel decoder? >> IMO, it should use the kfifo for it. However, if we allow both raw data and >> in-kernel decoders to read data there, we'll need a spinlock to protect the >> kfifo. > > This may be an option, but I think we should be able to attach protocol > decoders in parallel, directly to the IRQ handler. At least with RC-5 > (that's what I personally use) it means reliable decoding, no need for > any timeouts, the code is clean, fast (can be a part of hard IRQ > handler) and simple. > > The decoder needs something like > rc5_signal_change(ptr, space_or_mark, microseconds). > > At least mark->space or space->mark events must be reported. For better > reliability, both of them.
If you use a kfifo to store the event (space_or_mark, timestamp), the IRQ handler can return immediately, and a separate kernel thread can do the decode without needing to touch at the IRQ. It also helps to have a decoder independent of the kernel driver. Cheers, Mauro. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
