Files
OpenCellular/include
Nicolas Boichat 2f4fd74df5 hammer: Detect backlight circuitry
Pull-down means backlight is present, pull-up means backlight
is absent.

After detection, we still apply internal pull-down on the GPIO,
to make sure old boards with both pull-up and pull-down stuffed
do not always keep backlight on.

BRANCH=none
BUG=b:67722756
TEST=On reworked board with pull-down on backlight pin,
     backlight works, and "Backlight present" shown in console.
TEST=On old board with both pull-up and pull-down, backlight is
     off by default, and "Backlight not present" shown in console.

Change-Id: I6988c6ef8f4d155a08967db34f72d7ea4c835306
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/538458
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
2017-12-12 03:57:19 -08:00
..
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