A: No. Q: Should I include quotations after my reply? http://daringfireball.net/2007/07/on_top On Tue, Sep 20, 2011 at 12:04:41PM -0400, Lenny Story wrote: > Greg, > > The company i work for (mutualink.net) is building a compound device > for controlling radios. It has two USB audio codecs, a Serial port > (FTDI) and a board controller implemented in a USB AVR microcontroller > all sitting behind a HUB. Depending on the application, we have a > need to turn off one of the codecs, or cycle power on a single device. > Power is provided to these devices individually via the USB port power > for each of the ports. > > I can certainly turn off the power to each of the HUB's ports, and can > confirm it with external measurements. This is done with setFeature > packets and LibUSB1.0. The problem is that KHub has no idea that the > power was removed. I am uncomfortable messing with KHubs resources > without it being in the loop, which is why i am bringing this up. > Although, I would have expected a port change bit to notify khub that > something has changed, but i have not seen that happen. > > This application is obviously an embedded one and not the normal > desktop user. So the requirements here are different than probably 90% > of the users out there. > > I absolutely am not trying to suggest changes that aren't > architecturally sound, but i think since the USB Hub Committee thought > it was useful it can lend some credibility to it. ;) I think, in testing, not all hubs support this. Please test to verify this yourself. And again, patches showing what you are proposing is the best place to start discussing this. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
