Hi Alan, On Donnerstag, 25. Februar 2010, Alan Stern wrote: > On Thu, 25 Feb 2010, Juergen Beisert wrote: > > On Dienstag, 23. Februar 2010, Alan Stern wrote: > > > On Tue, 23 Feb 2010, Juergen Beisert wrote: > > > > is there a way to get an userland application informed about an > > > > overcurrent event on a USB connector? > > > > > > Not specifically. An application can monitor the system log, looking > > > for overcurrent notifications. > > > > According to this patch 'http://lwn.net/Articles/366346/' for harddisks: > > Would it be possible to add such a sysfs entry like 'state' to the HUB or > > its interfaces to notify any waiting userland application about changed > > states in the HUB or its interfaces? > > Such things can always be added; feel free to write a patch. I will try, but currently I'm not an expert in the USB subsystem... :-( > But what events will you want to report? Lots of things can happen to a hub > besides overcurrents. I think there are some interesting states a user can only discover by taking a look into the kernel logs. There is no additional help possible, because also applications can't detect these states: - _something_ is plugged into a port (= in use) - enumeration of the plugged device failed - overcurrent detected - orphaned device plugged in (no driver found) I think it would be an improvement if the system could notify the user about these kind of failures instead of simply doing nothing (from the sight of the user, the kernel drivers still do their jobs in the background) Juergen -- 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
