Call Hub FSI scan service prior to doing OCC bind

This is needed to make sure that the /dev/occ files are created
that are needed to communicate with OCC device. Also, calling to
this service is needed only when the first call to do OCC bind is
received.

Change-Id: I40466b8b74753b2f2366be385a8b066e912b32e4
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>

1 files changed, 30 insertions, 2 deletions

diff --git a/occ_status.cpp b/occ_status.cpp
index f740dc7..7eafb66 100644
--- a/occ_status.cpp
+++ b/occ_status.cpp
@@ -7,6 +7,11 @@ namespace open_power
 namespace occ
 {
 
+bool Status::hubFsiScanDone = false;
+
+// To initiate a FSI rescan
+constexpr auto fsiReScan = "1";
+
 // Handles updates to occActive property
 bool Status::occActive(bool value)
 {
@@ -14,16 +19,26 @@ bool Status::occActive(bool value)
     {
         if (value)
         {
+            if (!hubFsiScanDone)
+            {
+                // Need to do hub scan before we bind
+                this->scanHubFSI();
+            }
+
             // Bind the device
             device.bind();
 
             // And watch for errors
-            device.addErrorWatch();
+            // Commenting until we solve the occ error monitoring issue
+            // TODO: openbmc/openbmc#2126
+            // device.addErrorWatch();
         }
         else
         {
             // Stop watching for errors
-            device.removeErrorWatch();
+            // Commenting until we solve the occ error monitoring issue
+            // TODO: openbmc/openbmc#2126
+            // device.removeErrorWatch();
 
             // Do the unbind.
             device.unBind();
@@ -97,5 +112,18 @@ void Status::hostControlEvent(sdbusplus::message::message& msg)
     return;
 }
 
+// Scans the secondary FSI hub to make sure /dev/occ files are populated
+// Write "1" to achieve that
+void Status::scanHubFSI()
+{
+    std::ofstream file(FSI_SCAN_FILE, std::ios::out);
+    file << fsiReScan;
+    file.close();
+
+    // Hub FSI scan has been done. No need to do this for all the OCCs
+    hubFsiScanDone = true;
+    return;
+}
+
 } // namespace occ
 } // namespace open_power