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>

1 files changed, 5 insertions, 1 deletions

diff --git a/control/gen-fan-zone-defs.py b/control/gen-fan-zone-defs.py
index 1568137..3ccab36 100755
--- a/control/gen-fan-zone-defs.py
+++ b/control/gen-fan-zone-defs.py
@@ -140,7 +140,8 @@ const std::vector<ZoneGroup> Manager::_zoneLayouts
                         %for sensor in fan['sensors']:
                             "${sensor}",
                         %endfor
-                        }
+                        },
+                        "${fan['target_interface']}"
                     },
                 %endfor
                 },
@@ -665,6 +666,9 @@ def getFansInZone(zone_num, profiles, fan_data):
         fan = {}
         fan['name'] = f['inventory']
         fan['sensors'] = f['sensors']
+        fan['target_interface'] = f.get(
+            'target_interface',
+            'xyz.openbmc_project.Control.FanSpeed')
         fans.append(fan)
 
     return fans