GSoC 2017: Isochronous USB devices, guidance needed

[Tyler Jones]

Hello everyone,

I am a Computer Science student in the US, and I am interested in the
USB device work in Genode. I have experience with linux kernel USB device
drivers, and am interested in the challenge of widening that knowledge
with a separate and unique environment.

I have spent some time trying to familiarise myself with the Genode
code base and reading sections of the book, so I comfortable with how
the OS operates at a high level. However, I am uncertain with the most
appropriate direction in tackling the problem. Any help with this would
be greatly appreciated.

Thank you, in advance, for anyone willing to help guide me in a correct
direction. I look forward to contributing to this project in any way
that I am able!

Thanks again,

Tyler Jones

[Sebastian Sumpf]

Hello Tyler,

Post by Tyler Jones
Hello everyone,
I am a Computer Science student in the US, and I am interested in the
USB device work in Genode. I have experience with linux kernel USB device
drivers, and am interested in the challenge of widening that knowledge
with a separate and unique environment.
I have spent some time trying to familiarise myself with the Genode
code base and reading sections of the book, so I comfortable with how
the OS operates at a high level. However, I am uncertain with the most
appropriate direction in tackling the problem. Any help with this would
be greatly appreciated.

Basically, we imagine something like our 'usb_block' component
(repos/os/src/drivers/usb_block there is also a run script for testing
under repos/os/run/usb_block), just for isochronous devices (e.g,
external sound card or camera).

Our port of Linux's USB driver (repos/dde_linux) manages the USB host
controller(s) and offers an USB session (repos/os/include/usb_session),
which currently supports IRQ and BULK endpoints. Therefore, the session
interface would have to be extended to support isochronous requests, the
necessary support must be added to the USB driver's session
implementation, and a isochronous driver - lets say for an USB sound
card should be implemented or ported that communicates with the USB host
driver and offers a Genode audio session.

Regards,

Sebastian