[Celestica] rma-showtech: get GPIO line value of current direction in rma-showtech GPIO show

fboss/lib/GpiodLine.cpp

@@ -74,4 +74,28 @@ void GpiodLine::setValue(int defaultVal, int targetVal) {
   }
 }
 
+int GpiodLine::getLineValue() {
+  struct gpiod_line_request_config config = {
+      .consumer = name_.c_str(),
+      .request_type = GPIOD_LINE_REQUEST_DIRECTION_AS_IS,
+      .flags = 0};
+
+  if (gpiod_line_request(line_, &config, 0) != 0) {
+    throw GpiodLineError(
+        fmt::format(
+            "GpiodLineTrace: gpiod_line_request() failed for {}", name_));
+  }
+
+  int val = gpiod_line_get_value(line_); // Read the line value
+
+  if (-1 == val) {
+    throw GpiodLineError(
+        fmt::format(
+            "GpiodLineTrace: gpiod_line_get_value() failed to get {} value, errno = {}",
+            name_,
+            folly::errnoStr(errno)));
+  }
+
+  return val;
+}
 } // namespace facebook::fboss

fboss/lib/GpiodLine.h

@@ -26,6 +26,7 @@ class GpiodLine {
   ~GpiodLine();
   int getValue();
   void setValue(int defaultVal, int targetVal);
+  int getLineValue();
 
   // Forbidden copy constructor and assignment operator
   GpiodLine(GpiodLine const&) = delete;

fboss/platform/rma-showtech/Utils.cpp

@@ -464,8 +464,9 @@ void Utils::printGpio(const Gpio& gpio) {
     std::cout << fmt::format(
         "line {:>3}:   {:<15} -> ", *line.lineIndex(), *line.name());
     try {
-      std::cout << GpiodLine(chip, *line.lineIndex(), *line.name()).getValue()
-                << std::endl;
+      std::cout
+          << GpiodLine(chip, *line.lineIndex(), *line.name()).getLineValue()
+          << std::endl;
     } catch (const std::exception& e) {
       std::cout << fmt::format("Error: failed to read gpio line: {}", e.what())
                 << std::endl;