DCMI: Read power value from the configured D-Bus object path

1) Parse the power_reading JSON configuration file to get
   the D-Bus object path for the power reading.
2) Read the power reading value from the specified D-Bus object.

Change-Id: I4b9f0703318e8db2c86d0b337e524eee6da33d08
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/dcmihandler.hpp b/dcmihandler.hpp
index bd2c6e1..4e95eba 100644
--- a/dcmihandler.hpp
+++ b/dcmihandler.hpp
@@ -14,6 +14,7 @@ enum Commands
 {
     // Get capability bits
     GET_CAPABILITIES = 0x01,
+    GET_POWER_READING = 0x02,
     GET_POWER_LIMIT = 0x03,
     SET_POWER_LIMIT = 0x04,
     APPLY_POWER_LIMIT = 0x05,
@@ -427,6 +428,47 @@ namespace temp_readings
                                                    uint8_t instanceStart);
 }
 
+/** @brief Read power reading from power reading sensor object
+ *
+ *  @param[in] bus - dbus connection
+ *
+ *  @return total power reading
+ */
+int64_t getPowerReading(sdbusplus::bus::bus& bus);
+
+/** @struct GetPowerReadingRequest
+ *
+ *  DCMI Get Power Reading command request.
+ *  Refer DCMI specification Version 1.1 Section 6.6.1
+ */
+struct GetPowerReadingRequest
+{
+    uint8_t groupID;        //!< Group extension identification.
+    uint8_t mode;           //!< Mode
+    uint8_t modeAttribute;  //!< Mode Attributes
+} __attribute__((packed));
+
+/** @struct GetPowerReadingResponse
+ *
+ *  DCMI Get Power Reading command response.
+ *  Refer DCMI specification Version 1.1 Section 6.6.1
+ */
+struct GetPowerReadingResponse
+{
+    uint8_t groupID;            //!< Group extension identification.
+    uint16_t currentPower;      //!< Current power in watts
+    uint16_t minimumPower;      //!< Minimum power over sampling duration
+                                //!< in watts
+    uint16_t maximumPower;      //!< Maximum power over sampling duration
+                                //!< in watts
+    uint16_t averagePower;      //!< Average power over sampling duration
+                                //!< in watts
+    uint32_t timeStamp;         //!< IPMI specification based time stamp
+    uint32_t timeFrame;         //!< Statistics reporting time period in milli
+                                //!< seconds.
+    uint8_t powerReadingState;  //!< Power Reading State
+} __attribute__((packed));
+
 } // namespace dcmi
 
 #endif