On Fri 08. Jun - 09:04:03, Kristen Carlson Accardi wrote: > On Fri, 7 Nov 2036 16:00:45 +0100 > Holger Macht <hmacht@xxxxxxx> wrote: > > > On Fri 08. Jun - 18:47:06, Samuel Thibault wrote: > > [...] > > > Also, I'd really like to receive ACPI docking events in userland for > > > triggering video devices configuration for instance. > > > > Via udev. Unfortunately.... > > > > I just tries and it doesn't work properly. > > > > Dock driver contains something like this: > > > > --- > > /* > > * here we need to generate the undock > > * event prior to actually doing the undock > > * so that the device struct still exists. > > */ > > dock_event(ds, event, UNDOCK_EVENT); > > hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); > > undock(ds); > > eject_dock(ds); > > --- > > > > When udev receives the KOBJ_CHANGE event triggered by dock_event(), some > > application or udev itself does read the content of > > /sys/devices/platform/dock.0/docked. But the value is not updated > > yet. Checking manually with cat, it sometimes even needs up to two seconds > > for the right value (0) to show up. So we cannot rely on getting the real > > state at the point in time where the udev event is received. > > > > At first, function dock_event(..) doesn't need any of the passed > > arguments. It only makes use of the static platform_device dock_device > > object to execute a kobject_uevent(). So wouldn't it be save to execute > > the dock_event() _after_ actually undocking? Something like the following? > > Actually it does - the latest patches sent to Len contain modifications > to pass an ENV value with the dock event so that userspace can use that > to determine whether we are doing or undocking. You might check out > the "immediate_undock" module parameter patch that I also sent to Len that > will allow you to write scripts to do work before the undock actually > happens - http://marc.info/?l=linux-kernel&m=117874881923973&w=2 Oh yes, I saw the immediate_undock patch, but the one with the uevent changes somehow slipped through my attention. Thanks. - Holger - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
