commit b5bfcbc6e53d3aa9a92776cd9ea1c8acde495a87
author Anupama B R <anupama.b.r1@ibm.com> Mon Mar 03 03:00:04 2025 -0600
committer Jinu Joy Thomas <jinu.joy.thomas@in.ibm.com> Thu Mar 20 07:31:07 2025 +0000
tree 1ff089af0597d830b15136672aa9a04fcf7ce14c
parent de581eb3c396d21490d61b1f1013fc391c2f9c79

API to read IM value from system planar

This commit implements an API to read IM value from system planar using
the IM keyword offset value.

Change-Id: I69f48895aa814e31a4ce23bcf4f8aa954449c969
Signed-off-by: Anupama B R <anupama.b.r1@ibm.com>

vpd-manager/include/single_fab.hpp

diff --git a/vpd-manager/include/single_fab.hpp b/vpd-manager/include/single_fab.hpp
index 03c6cee..8587519 100644
--- a/vpd-manager/include/single_fab.hpp
+++ b/vpd-manager/include/single_fab.hpp
@@ -22,5 +22,12 @@
      * @return IM value on success, empty string otherwise.
      */
     std::string getImFromPersistedLocation() const noexcept;
+
+    /**
+     * @brief API to get IM value from system planar EEPROM path.
+     *
+     * @return IM value on success, empty string otherwise.
+     */
+    std::string getImFromPlanar() const noexcept;
 };
 } // namespace vpd

vpd-manager/src/single_fab.cpp

diff --git a/vpd-manager/src/single_fab.cpp b/vpd-manager/src/single_fab.cpp
index 9b2045c..24556d0 100644
--- a/vpd-manager/src/single_fab.cpp
+++ b/vpd-manager/src/single_fab.cpp
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include "single_fab.hpp"
 
 #include "constants.hpp"
@@ -9,6 +11,8 @@
 {
 constexpr auto pimPersistVsbpPath =
     "/var/lib/phosphor-inventory-manager/xyz/openbmc_project/inventory/system/chassis/motherboard/com.ibm.ipzvpd.VSBP";
+constexpr auto IM_SIZE_IN_BYTES = 0x04;
+constexpr auto IM_KW_VALUE_OFFSET = 0x000005fb;
 
 std::string SingleFab::getImFromPersistedLocation() const noexcept
 {
@@ -46,4 +50,39 @@
 
     return std::string();
 }
+
+std::string SingleFab::getImFromPlanar() const noexcept
+{
+    try
+    {
+        types::BinaryVector l_imValue(IM_SIZE_IN_BYTES);
+        std::fstream l_vpdFileStream;
+
+        l_vpdFileStream.exceptions(
+            std::ifstream::badbit | std::ifstream::failbit);
+
+        l_vpdFileStream.open(SYSTEM_VPD_FILE_PATH,
+                             std::ios::in | std::ios::binary);
+
+        l_vpdFileStream.seekg(IM_KW_VALUE_OFFSET, std::ios_base::beg);
+
+        // Read keyword value
+        l_vpdFileStream.read(reinterpret_cast<char*>(&l_imValue[0]),
+                             IM_SIZE_IN_BYTES);
+
+        l_vpdFileStream.clear(std::ios_base::eofbit);
+
+        std::ostringstream l_imData;
+        for (const auto& l_byte : l_imValue)
+        {
+            l_imData << std::setw(2) << std::setfill('0') << std::hex
+                     << static_cast<int>(l_byte);
+        }
+        return l_imData.str();
+    }
+    catch (const std::ifstream::failure& l_ex)
+    {}
+
+    return std::string();
+}
 } // namespace vpd