sbs-battery: Probe should try talking to the device
authorOlof Johansson <olof@lixom.net>
Thu, 6 Sep 2012 18:32:29 +0000 (11:32 -0700)
committerAnton Vorontsov <anton.vorontsov@linaro.org>
Thu, 20 Sep 2012 21:57:52 +0000 (14:57 -0700)
commita22b41a31e5382792151f193d185a3cd39593cfd
treeb63c1392dd28c602bc26cc8075f466a4077f5064
parent1502cfe19bac2f8490e4167f2b7cb50b9759b273
sbs-battery: Probe should try talking to the device

Turns out this driver doesn't actually try talking to the device at
probe time, so if it's incorrectly configured in the device tree or
platform data (or if the battery has been removed from the system),
then probe will succeed and every access will sit there and time out.
The end result is a possibly laggy system that thinks it has a battery
but can never read status, which isn't very useful.

Instead, just read any register (I chose status) at probe, and if that
fails, don't register the device.

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
drivers/power/sbs-battery.c