A driver for the Sonata's RGB LED Controller

sdk/include/platform/sunburst/platform-rgbctrl.hh

diff --git a/sdk/include/platform/sunburst/platform-rgbctrl.hh b/sdk/include/platform/sunburst/platform-rgbctrl.hh
new file mode 100644
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+++ b/sdk/include/platform/sunburst/platform-rgbctrl.hh
@@ -0,0 +1,83 @@
+#pragma once
+#include <cdefs.h>
+#include <stdint.h>
+
+/**
+ * An enum representing each of the Sonata's RGB LEDs.
+ */
+enum class SonataRgbLed
+{
+	Led0,
+	Led1,
+};
+
+/**
+ * A driver for the Sonata's RGB LED Controller
+ */
+struct SonataRgbLedController
+{
+	/**
+	 * Registers for setting the 8-bit red, green, and blue values
+	 * for the two RGB Leds.
+	 */
+	uint32_t rgbLed0;
+	uint32_t rgbLed1;
+	/// Control Register
+	uint32_t control;
+	/// Status Register
+	uint32_t status;
+
+	/// Control Register Fields
+	enum [[clang::flag_enum]] : uint32_t{
+	  /// Write 1 to set RGB LEDs to specified colours.
+	  ControlSet = 1 << 0,
+	  /**
+	   * Write 1 to turn off RGB LEDs.
+	   * Write to ControlSet to turn on again.
+	   */
+	  ControlOff = 1 << 1,
+	};
+
+	/// Status Register Fields
+	enum [[clang::flag_enum]] : uint32_t{
+	  /**
+	   * When asserted controller is idle and new colours can be set,
+	   * otherwise writes to regLed0, regLed1, and control are ignored.
+	   */
+	  StatusIdle = 1 << 0,
+	};
+
+	void wait_for_idle() volatile
+	{
+		while ((status & StatusIdle) == 0) {}
+	}
+
+	void
+	rgb(uint8_t red, uint8_t green, uint8_t blue, SonataRgbLed led) volatile
+	{
+		uint32_t rgb = (static_cast<uint32_t>(blue) << 16) |
+		               (static_cast<uint32_t>(green) << 8) |
+		               static_cast<uint32_t>(red);
+		wait_for_idle();
+
+		switch (led)
+		{
+			case SonataRgbLed::Led0:
+				rgbLed0 = rgb;
+			case SonataRgbLed::Led1:
+				rgbLed1 = rgb;
+		};
+	}
+
+	void update() volatile
+	{
+		wait_for_idle();
+		control = ControlSet;
+	}
+
+	void clear() volatile
+	{
+		wait_for_idle();
+		control = ControlOff;
+	}
+};