Timer to decrease fan speeds

Create a repeating timer for decreasing fan speeds where the fan speeds
in the zone are decreased when the timer expires and a decrease speed
request exists with no increase request present or active.

Change-Id: I419592f6f50c0ed524f8bf3ebf183854ab5ef2ea
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/control/zone.hpp b/control/zone.hpp
index f445472..30de150 100644
--- a/control/zone.hpp
+++ b/control/zone.hpp
@@ -5,6 +5,7 @@
 #include <sdbusplus/server.hpp>
 #include "fan.hpp"
 #include "types.hpp"
+#include "timer.hpp"
 
 namespace phosphor
 {
@@ -46,10 +47,12 @@ class Zone
          *
          * @param[in] mode - mode of fan control
          * @param[in] bus - the dbus object
+         * @param[in] events - sd_event pointer
          * @param[in] def - the fan zone definition data
          */
         Zone(Mode mode,
              sdbusplus::bus::bus& bus,
+             phosphor::fan::event::EventPtr& events,
              const ZoneDefinition& def);
 
         /**
@@ -204,6 +207,12 @@ class Zone
          */
         void requestSpeedDecrease(uint64_t targetDelta);
 
+        /**
+         * @brief Callback function for the decrease timer that processes any
+         * requested speed decreases if allowed
+         */
+        void decTimerExpired();
+
     private:
 
         /**
@@ -267,6 +276,11 @@ class Zone
         uint64_t _decSpeedDelta = 0;
 
         /**
+         * The decrease timer object
+         */
+        phosphor::fan::util::Timer _decTimer;
+
+        /**
          * The vector of fans in this zone
          */
         std::vector<std::unique_ptr<Fan>> _fans;