Hi,
Thanks for sharing this!
On 10/21/2014 01:40 AM, Kim Taylor wrote:
I've written a driver for raw MIDI using the PL011. It is obviously based on the snd-serial-u16550 module, with a couple of improvements:
I've implemented a drain() callback.
I've also implemented a half duplex mode based on a timer callback
which was necessary for reliable communication with my eMagic Unitor 8 hardware. (Testing with a serial link to other hardware shows that the full duplex mode is also working.)
So I guess you could patch the existing driver to make it work for your use case, right? I haven't looked at the code in detail, but from what you describe, that should be possible.
It can be found here: https://github.com/kmtaylor/rpi_patches/blob/master/serial-pl011.c
If you think it should be included in the ALSA repository, please let me know what to do next.
Clone this repository:
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
and integrate your changes there, then send patches to this mailing list. Especially if you're doing it for the first time, Documentation/SubmittingPatches is a good read to omit some typical pitfalls.
Best regards, Daniel