fuzzing_engine: Add fuzzing engine uclass

This new class of device will provide fuzzing inputs from a fuzzing
engine.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/fuzzing_engine.h

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2022 Google, Inc.
+ * Written by Andrew Scull <ascull@google.com>
+ */
+
+#ifndef __FUZZING_ENGINE_H
+#define __FUZZING_ENGINE_H
+
+struct udevice;
+
+/**
+ * dm_fuzzing_engine_get_input() - get an input from the fuzzing engine device
+ *
+ * The function will return a pointer to the input data and the size of the
+ * data pointed to. The pointer will remain valid until the next invocation of
+ * this function.
+ *
+ * @dev:	fuzzing engine device
+ * @data:	output pointer to input data
+ * @size	output size of input data
+ * Return:	0 if OK, -ve on error
+ */
+int dm_fuzzing_engine_get_input(struct udevice *dev,
+				const uint8_t **data,
+				size_t *size);
+
+/**
+ * struct dm_fuzzing_engine_ops - operations for the fuzzing engine uclass
+ *
+ * This contains the functions implemented by a fuzzing engine device.
+ */
+struct dm_fuzzing_engine_ops {
+	/**
+	 * @get_input() - get an input
+	 *
+	 * The function will return a pointer to the input data and the size of
+	 * the data pointed to. The pointer will remain valid until the next
+	 * invocation of this function.
+	 *
+	 * @get_input.dev:	fuzzing engine device
+	 * @get_input.data:	output pointer to input data
+	 * @get_input.size	output size of input data
+	 * @get_input.Return:	0 if OK, -ve on error
+	 */
+	int (*get_input)(struct udevice *dev,
+			 const uint8_t **data,
+			 size_t *size);
+};
+
+#endif /* __FUZZING_ENGINE_H */