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Commit 72b09896 authored by Damien Lespiau's avatar Damien Lespiau Committed by Daniel Vetter
Browse files

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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDamien Lespiau <damien.lespiau@intel.com>
Acked-by: default avatarDave Airlie <airlied@gmail.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 3c6b054d

drivers/video/hdmi.c

+43 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/hdmi.h

+17 −0
Original line number Diff line number Diff line
@@ -23,6 +23,12 @@ enum hdmi_infoframe_type { 
#define HDMI_SPD_INFOFRAME_SIZE    25

#define HDMI_AUDIO_INFOFRAME_SIZE  10



struct hdmi_any_infoframe {

	enum hdmi_infoframe_type type;

	unsigned char version;

	unsigned char length;

};



enum hdmi_colorspace {

	HDMI_COLORSPACE_RGB,

	HDMI_COLORSPACE_YUV422,
@@ -228,4 +234,15 @@ struct hdmi_vendor_infoframe { 
ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,

				   void *buffer, size_t size);



union hdmi_infoframe {

	struct hdmi_any_infoframe any;

	struct hdmi_avi_infoframe avi;

	struct hdmi_spd_infoframe spd;

	struct hdmi_vendor_infoframe vendor;

	struct hdmi_audio_infoframe audio;

};



ssize_t

hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size);



#endif /* _DRM_HDMI_H */