tree 2d0083ed580d8bd3218a25cb75095cad4a9ed906
parent 80f271b296488e12d4edd29b5bb908a407fbda1f
author Lei YU <mine260309@gmail.com> 1517388457 +0800
committer Lei YU <mine260309@gmail.com> 1519612476 +0800

Add target interface for fan control

Current fan control assumes the use of the FanSpeed interface for fan
targets.
For fans controlled by pwm, FanPwm interface is added.

This commit adds "target_interface" config parameter, so that user can
specify the interface for the fan targets.

E.g.

  - inventory: /system/chassis/motherboard/fan0
    cooling_zone: 0
    cooling_profile: air
    sensors:
      - fan0
    target_interface: xyz.openbmc_project.Control.FanPwm

The config is optional and defaults to FanSpeed, so the current code
will not be affected.

Tested: Use this config on Romulus, ensures the fan control sets
        target on FanPwm interface and works fine.

Change-Id: I73adccaa770d657b5d7aaeb307917f89588524de
Signed-off-by: Lei YU <mine260309@gmail.com>