lkml.org 
[lkml]   [2013]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Non-enumerable devices on USB and other enumerable buses
On Wed, 14 Aug 2013, Mark Brown wrote:

> On Mon, Aug 12, 2013 at 09:04:00PM -0400, Alan Stern wrote:
>
> > The bus code would need hooks installed wherever the platform wants to
> > do something extra. This could end up growing to a lot of hooks. How
> > can the whole thing be done in a reasonable fashion?
>
> I'd expect that we're just looking at hooks around connection and
> disconnection here here - if we're looking at much more it seems like we
> must be doing something wrong.

Connection and disconnection of what?

In the example mentioned earlier, the GPIOs to power an on-board USB
hub would have to be initialized when the host controller was started.
You wouldn't want to wait for the on-board hub to be detected, because
without those GPIOs set properly, it never would be discovered on the
USB bus. Right?

Perhaps the platform-level code would need to hook into the places
where the discoverable bus is registered and unregistered.

Alan Stern



\
 
 \ /
  Last update: 2013-08-14 17:01    [W:0.106 / U:1.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site