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authorDamien Lespiau <damien.lespiau@intel.com>2013-08-06 23:32:14 +0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2013-08-08 16:04:45 +0400
commit72b098964d3c3fb030dcac2d4c869c9851a0d17a (patch)
tree12a53e67bc5563db2d91f0d89c788b2daa9bfd78 /drivers/video/hdmi.c
parent3c6b054de1c0243a0f708abf337f2a0e270ce247 (diff)
downloadlinux-72b098964d3c3fb030dcac2d4c869c9851a0d17a.tar.xz
video/hdmi: Introduce a generic hdmi_infoframe union
And a way to pack hdmi_infoframe generically. Cc: Thierry Reding <thierry.reding@avionic-design.de> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Acked-by: Dave Airlie <airlied@gmail.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/video/hdmi.c')
-rw-r--r--drivers/video/hdmi.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index dbd882ffafbb..f7a85e5b7370 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -22,6 +22,7 @@
*/
#include <linux/bitops.h>
+#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/hdmi.h>
@@ -321,3 +322,45 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
return length;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
+
+/**
+ * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer
+ * @frame: HDMI infoframe
+ * @buffer: destination buffer
+ * @size: size of buffer
+ *
+ * Packs the information contained in the @frame structure into a binary
+ * representation that can be written into the corresponding controller
+ * registers. Also computes the checksum as required by section 5.3.5 of
+ * the HDMI 1.4 specification.
+ *
+ * Returns the number of bytes packed into the binary buffer or a negative
+ * error code on failure.
+ */
+ssize_t
+hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size)
+{
+ ssize_t length;
+
+ switch (frame->any.type) {
+ case HDMI_INFOFRAME_TYPE_AVI:
+ length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
+ break;
+ case HDMI_INFOFRAME_TYPE_SPD:
+ length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
+ break;
+ case HDMI_INFOFRAME_TYPE_AUDIO:
+ length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
+ break;
+ case HDMI_INFOFRAME_TYPE_VENDOR:
+ length = hdmi_vendor_infoframe_pack(&frame->vendor,
+ buffer, size);
+ break;
+ default:
+ WARN(1, "Bad infoframe type %d\n", frame->any.type);
+ length = -EINVAL;
+ }
+
+ return length;
+}
+EXPORT_SYMBOL(hdmi_infoframe_pack);