Am Sonntag, 19. November 2006 12:16 schrieb Christoph Pittracher:
> Hello list,
> is it possible to modify the USB configuration descriptor sent by the
> slave device?
Not by generic means.
> I try to get the BlackBerry handheld device charging over USB. The
> problem is that the BlackBerry claims it doesn't get enough power over
> the bus and I should install the USB driver.
>
> lsusb lists only one configuration for the BlackBerry device where
> bMaxPower is set to 100mA. As far as I know the USB device tells the
> host how much power it consumes with the configuration descriptor.
>
> So is there a way to modify the configuration descriptor to allow a
> current of 500mA even though the device reports that it only needs
> 100mA?
The actual power consumption is not monitored by the OS.
At some point the hub will be overloaded, but the OS relies on
the power consumption figures to be accurate. Linux will not choose
any configuration outside the power budget, but that's it.
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
