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Date: Mon, 3 Oct 2011 14:43:20 +0800 From: Daniel Kurtz <djkurtz@...omium.org> To: dmitry.torokhov@...il.com Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org> Subject: [PATCH] Input: evdev - use monotonic clock for event timestamps Using wallclock time for event timestamps subjects inter-event timing to ntp and other clock adjustments. This complicates userspace drivers that use these timestamps to calculate velocities, or while processing state transitions. Instead, use the kernel monotonic clock for event timestamps, which is at least guaranteed never to go backwards. Signed-off-by: Daniel Kurtz <djkurtz@...omium.org> --- drivers/input/evdev.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 4cf2534..118f936 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -94,8 +94,11 @@ static void evdev_event(struct input_handle *handle, struct evdev *evdev = handle->private; struct evdev_client *client; struct input_event event; + struct timespec now; - do_gettimeofday(&event.time); + getrawmonotonic(&now); + event.time.tv_sec = now.tv_sec; + event.time.tv_usec = now.tv_nsec/1000; event.type = type; event.code = code; event.value = value; -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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