Am Donnerstag, 4. Januar 2007 07:58 schrieb Mike King:
> >
> > Am Donnerstag, 4. Januar 2007 07:30 schrieb Mike King:
> > > Anytime a SET_CONFIGURATION is sent to the device without being preceeded
> > > by the secret vendor specific command the device reverts to the previous
> > > device descriptor data indicating 100ma. A normal reset causes it
> > > to default to the normal power setting.
> > >
> > > So, my basic problem is that the Linux USB core does the SET_CONFIGURATION
> > > as part of device initialization after the device is plugged in, long
> > > before my driver is probed. I never get the opportunity to send
> > > the secret command to the device. If I actually write the secret
> > > command followed by a SET_CONFIGURATION from my driver the BB device
> > > will reset itself but the Linux core does another SET_CONFIGURATION
> > > upon seeing the reset and so the hidden device descriptor data has
> > > reverted back to the low power setting.
> >
> > Does it work if you issue the secret command, wait and then reset the device
> > in your probe method?
> >
> > Regards
> > Oliver
> >
>
> Oliver,
>
> Nope. Writing the secret command and the SET_CONFIGURATION causes the
> device to reset itself. USB Core reassigns the address and issues yet
> another SET_CONFIGURATION which causes the default device descriptor to
> reappear.
Sorry, I was unclear. I am suggesting that in your probe() method you:
- issue the secret command
- wait the settling time
- issue a full device reset, not SET_CONFIGURATION
If that doesn't work I can't see a nice way to deal with this problem.
Claiming a full device is major surgery. If you need to, you can claim all
other interfaces from the probe() method for the first interface.
If the little trick suggested above doesn't work, I don't see a way to get
around this without messing with usbcore.
Regards
Oliver
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
linux-usb-devel@lists.sourceforge.net
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
