forked from Minki/linux
06a16293f7
Hardware manufacturers group keys in the weirdest way possible. This may cause a power-key to be grouped together with normal keyboard keys and thus be reported on the same kernel interface. However, user-space is often only interested in specific sets of events. For instance, daemons dealing with system-reboot (like systemd-logind) listen for KEY_POWER, but are not interested in any main keyboard keys. Usually, power keys are reported via separate interfaces, however, some i8042 boards report it in the AT matrix. To avoid waking up those system daemons on each key-press, we had two ideas: - split off KEY_POWER into a separate interface unconditionally - allow filtering a specific set of events on evdev FDs Splitting of KEY_POWER is a rather weird way to deal with this and may break backwards-compatibility. It is also specific to KEY_POWER and might be required for other stuff, too. Moreover, we might end up with a huge set of input-devices just to have them properly split. Hence, this patchset implements the second idea: An event-mask to specify which events you're interested in. Two ioctls allow setting this mask for each event-type. If not set, all events are reported. The type==0 entry is used same as in EVIOCGBIT to set the actual EV_* mask of filtered events. This way, you have a two-level filter. We are heavily forward-compatible to new event-types and event-codes. So new user-space will be able to run on an old kernel which doesn't know the given event-codes or event-types. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> |
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| asm-generic | ||
| drm | ||
| linux | ||
| misc | ||
| mtd | ||
| rdma | ||
| scsi | ||
| sound | ||
| video | ||
| xen | ||
| Kbuild | ||