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4ced1d7d6a
In order to make a single hammer image support both base with and
without keyboard backlight. We need a way to dynamically determine if
backlight is present, and send the correct HID descriptors. This is done
through declaring two HID descriptors and return the correct one
depending on whether or not the backlight is present.
BRANCH=none
BUG=b:67722756
TEST=On reworked board with pull-down on backlight pin,
USB descriptor has backlight HID report descriptor, and is
functional.
TEST=On old board with both pull-up and pull-down (equivalent to
having pull-up only, i.e. no backlight)
USB descriptor does not have backlight HID report descriptor
Change-Id: Ie3eac9b3d4cd749308ccfb96a7db469701f9793b
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/770600
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly