media: videodev2: Add helper defines for printing FOURCCs

New helper defines that allow printing of a FOURCC using
printf(V4L2_FOURCC_CONV, V4L2_FOURCC_CONV_ARGS(fourcc));

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1aae2e4..9a860b2 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -82,6 +82,11 @@
        ((__u32)(a) | ((__u32)(b) << 8) | ((__u32)(c) << 16) | ((__u32)(d) << 24))
 #define v4l2_fourcc_be(a, b, c, d)     (v4l2_fourcc(a, b, c, d) | (1 << 31))
 
+#define V4L2_FOURCC_CONV "%c%c%c%c%s"
+#define V4L2_FOURCC_CONV_ARGS(fourcc) \
+       (fourcc) & 0x7f, ((fourcc) >> 8) & 0x7f, ((fourcc) >> 16) & 0x7f, \
+       ((fourcc) >> 24) & 0x7f, (fourcc) & BIT(31) ? "-BE" : ""
+
 /*
  *     E N U M S
  */