media: allegro: add helper to report unsupported fields

Allow generators to explicitly signal an error if the C structs contain
unsupported or invalid fields.
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/allegro-dvt/nal-rbsp.c

@@ -29,6 +29,11 @@ void rbsp_init(struct rbsp *rbsp, void *addr, size_t size,
 	rbsp->error = 0;
 }
 
+void rbsp_unsupported(struct rbsp *rbsp)
+{
+	rbsp->error = -EINVAL;
+}
+
 static int rbsp_read_bits(struct rbsp *rbsp, int n, unsigned int *value);
 static int rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int value);
 

drivers/media/platform/allegro-dvt/nal-rbsp.h

@@ -49,6 +49,7 @@ extern struct nal_rbsp_ops read;
 
 void rbsp_init(struct rbsp *rbsp, void *addr, size_t size,
 	       struct nal_rbsp_ops *ops);
+void rbsp_unsupported(struct rbsp *rbsp);
 
 void rbsp_bit(struct rbsp *rbsp, int *value);
 void rbsp_bits(struct rbsp *rbsp, int n, int *value);