Reused ACT (led0) light as activity light.

LED.cpp

@@ -0,0 +1,49 @@
+#include "LED.hpp"
+#include <fstream>
+#include <stdexcept>
+#include <string>
+
+using namespace std;
+
+bool& ledState()
+{
+	static bool state = true;
+	return state;
+}
+
+bool getLEDState()
+{
+	return ledState();
+}
+
+void disableACTTrigger(bool nowDisabled)
+{
+	ofstream trigFile{ "/sys/class/leds/led0/trigger", ofstream::out | ofstream::trunc };
+
+	if (!trigFile)
+		throw runtime_error{ "Failed to retrieve led0 trigger file" };
+
+	if (!static_cast<bool>(trigFile << (nowDisabled ? "none" : "mmc0")))
+		throw runtime_error{ "Failed to write led0 trigger to file" };
+}
+
+void enableACTLED(bool nowOn)
+{
+	if (nowOn == getLEDState())
+		return;
+
+	ofstream enabledFile{ "/sys/class/leds/led0/brightness", ofstream::out | ofstream::trunc };
+
+	if (!enabledFile)
+		throw runtime_error{ "Failed to retrieve led0 brightness" };
+
+	if (!static_cast<bool>(enabledFile << to_string(nowOn ? 0 : 1)))
+		throw runtime_error{ "Failed to write led0 brightness to file" };
+
+	ledState() = nowOn;
+}
+
+void toggleACTLED()
+{
+	enableACTLED(!getLEDState());
+}