Nicolas Boichat
fb58920c9e
usb_hid_touchpad: Add timestamp field to touch events
...
We use the unofficial, Windows 8, Relative Scan time HID usage
(Digitizer page, 0x56) to add timestamps to our HID touchpad
events.
The timestamps is a rolling, unsigned, 16-bit integer, with a
resolution of 100us (so it wraps around every 6.5s).
The host will be able to synchronize to that timestamp, resetting
an offset every time the touchpad is quiet a certain amount of
time (e.g. 1 second).
BRANCH=none
BUG=b:63685117
TEST=Flash hammer, timestamps are reported in HID descriptor.
Change-Id: Ie5d56a9df14e464d2cdcd559f550d6e3cc81961f
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org >
Reviewed-on: https://chromium-review.googlesource.com/603041
Reviewed-by: Vincent Palatin <vpalatin@chromium.org >
2017-08-16 06:03:49 -07:00
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