From 9fb0f14e31b6101a0cc69a333b43541044f9b0a6 Mon Sep 17 00:00:00 2001 From: Jeff Brown Date: Tue, 12 Apr 2011 23:29:38 -0700 Subject: Input: evdev - indicate buffer overrun with SYN_DROPPED Add a new EV_SYN code, SYN_DROPPED, to inform the client when input events have been dropped from the evdev input buffer due to a buffer overrun. The client should use this event as a hint to reset its state or ignore all following events until the next packet begins. Signed-off-by: Jeff Brown [dtor@mail.ru: Implement Henrik's suggestion and drop old events in case of overflow.] Signed-off-by: Dmitry Torokhov --- Documentation/input/event-codes.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation') diff --git a/Documentation/input/event-codes.txt b/Documentation/input/event-codes.txt index f13aee55040..23fcb05175b 100644 --- a/Documentation/input/event-codes.txt +++ b/Documentation/input/event-codes.txt @@ -85,6 +85,12 @@ sent in the evdev event stream. - Used to synchronize and separate touch events. See the multi-touch-protocol.txt document for more information. +* SYN_DROPPED: + - Used to indicate buffer overrun in the evdev client's event queue. + Client should ignore all events up to and including next SYN_REPORT + event and query the device (using EVIOCG* ioctls) to obtain its + current state. + EV_KEY: ---------- EV_KEY events take the form KEY_ or BTN_. For example, KEY_A is used -- cgit v1.2.3