tree 6b1cb8b57080af180313d4d6583acd88090b028e
parent 06b6b359356e403dfe7bda5c4c11ec664899ae3b
author Todd Poynor <toddpoynor@google.com> 1456540303 -0800
committer chrome-bot <chrome-bot@chromium.org> 1456612578 -0800

brillo: Test required power management interfaces present

Add test brillo_PowerMgmtInterfaces, which verifies the power management
interfaces required by the DPS are present:

* kernel wakelocks: verify the wakelock sysfs interface is present.
  N.B.: It is not possible to build a brillo kernel without support.

* cpufreq: verify CPU 0's cpufreq sysfs interface is present, and has
  at least one scaling governor available.

* cpuidle: verify the cpuidle sysfs interface is present and a cpuidle
  driver is registered.

This test is added to the Brillo BVT, but not smoke tests, as the Brillo
emulator does not meet all of the above requirements.

Bug: 26163706
Change-Id: I21943dcd9412fb37aae57d75e64aed890fd9c057
Reviewed-on: https://chromium-review.googlesource.com/329605
Commit-Ready: Todd Poynor <toddpoynor@google.com>
Tested-by: Todd Poynor <toddpoynor@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>