Re: Serial MIDI driver for PL011 - as found on BCM2835 hardware

[Daniel Mack <daniel@zonque.org>]

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