On Wed, 12 Jan 2005, Brian Ristuccia wrote: > On Wed, Jan 12, 2005 at 07:42:57AM -0800, David Brownell wrote: > > > > The current stack doesn't have such a way, but it sounds almost like > > you're describing the ability to selectively power down (and back up) > > a given hub port ... which USB certainly allows. > > > > Yes! You've hit the nail right on the head! > > > To code that you'd need to change the hub driver in usbcore, and also > > guarantee you're using hubs that support per-port power switching. > > Most external hubs do; many root hubs don't. > > > > Lack of power control on hub ports is a bummer, but something I suppose I > could work around considering the specialized nature of my application. > > I'll do some hacking and see if I can get things basicly working. If there's > interest in this sort of thing, I can send patches to the list and perhaps > someone with more experience in the USB stack than I have can sanitize > things for general purpose use.
You ought to be able to write a user program to send a set-port-feature message to any given hub. No kernel driver changes needed. Alan Stern ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
