AudioControlWM8731::inputLevel(float n)

control_wm8731.cpp

@@ -96,7 +96,17 @@ bool AudioControlWM8731::volumeInteger(unsigned int n)
 	return true;
 }
 
+bool AudioControlWM8731::inputLevel(float n)
+{
+	// range is 0x00 (min) - 0x1F (max)
+
+	int _level = int(n * 31.f); 
 
+	_level = _level > 0x1F ? 0x1F : _level;
+	write(WM8731_REG_LLINEIN, _level);
+	write(WM8731_REG_RLINEIN, _level);
+	return true;
+}
 
 /******************************************************************/
 

control_wm8731.h

@@ -35,7 +35,7 @@ public:
 	bool enable(void);
 	bool disable(void) { return false; }
 	bool volume(float n) { return volumeInteger(n * 80.0 + 47.499); }
-	bool inputLevel(float n) { return false; }
+	bool inputLevel(float n); // range: 0.0f to 1.0f
 	bool inputSelect(int n) { return false; }
 protected:
 	bool write(unsigned int reg, unsigned int val);