Alec Berg e5ec074dfa ryu: fix max lightbar brightness ...

Fix max brightness for Ryu. The max brightness must be less than
0x80 because the top bit in the lightbar current registers is
reserved. Writing the top bit seems to have undefined behavior.

This fixes the hiccups in the tap for battery sequence which was
ramping brightness to above 0x80 and producing weird results.

BUG=chrome-os-partner:45835, chrome-os-partner:44029
BRANCH=smaug
TEST=test tap for battery looks smooth.
test that the google colors match the desired current levels:
> lightbar
 ...
 15     0f     06
 16     0f     20
 17     16     08
 18     06     21
 19     26     11
 1a     1d     0b

Change-Id: Iecf1c770f986064b9b4d2d3d54fab0ea1242af01
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/302146
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit 133dab0c36160d0e54820cce9e97071df34340f8)
Reviewed-on: https://chromium-review.googlesource.com/302446

2015-09-25 09:13:34 -07:00

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