video/hdmi: Hook the HDMI vendor infoframe with the generic _pack()

With this last bit, hdmi_infoframe_pack() is now able to pack any
infoframe we support.

At the same time, because it's impractical to make two commits out of
this, we get rid of the version that encourages the open coding of the
vendor infoframe packing. We can do so because the only user of this API
has been ported in:

Author: Damien Lespiau <[e-mail]>
Date: Mon Aug 12 18:08:37 2013 +0100

gpu: host1x: Port the HDMI vendor infoframe code the common helpers

v2: Change oui to be an unsigned int (Ville Syrjälä)

Signed-off-by: Damien Lespiau <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Reviewed-by: Thierry Reding <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/video/hdmi.c

···
 	frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
 	frame->version = 1;
 
+	frame->oui = HDMI_IDENTIFIER;
+
 	/*
 	 * 0 is a valid value for s3d_struct, so we use a special "not set"
 	 * value
···
 }
 EXPORT_SYMBOL(hdmi_hdmi_infoframe_pack);
 
-/**
- * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary
- *                                buffer
- * @frame: HDMI vendor 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.
+/*
+ * hdmi_vendor_infoframe_pack() - write a vendor infoframe to binary buffer
  */
-ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
-				   void *buffer, size_t size)
+static ssize_t hdmi_vendor_infoframe_pack(union hdmi_vendor_infoframe *frame,
+					  void *buffer, size_t size)
 {
-	u8 *ptr = buffer;
-	size_t length;
+	/* we only know about HDMI vendor infoframes */
+	if (frame->any.oui != HDMI_IDENTIFIER)
+		return -EINVAL;
 
-	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
-
-	if (size < length)
-		return -ENOSPC;
-
-	memset(buffer, 0, size);
-
-	ptr[0] = frame->type;
-	ptr[1] = frame->version;
-	ptr[2] = frame->length;
-	ptr[3] = 0; /* checksum */
-
-	memcpy(&ptr[HDMI_INFOFRAME_HEADER_SIZE], frame->data, frame->length);
-
-	hdmi_infoframe_checksum(buffer, length);
-
-	return length;
+	return hdmi_hdmi_infoframe_pack(&frame->hdmi, buffer, size);
 }
-EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
 
 /**
  * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer

include/linux/hdmi.h

···
 ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
 				  void *buffer, size_t size);
 
-struct hdmi_vendor_infoframe {
-	enum hdmi_infoframe_type type;
-	unsigned char version;
-	unsigned char length;
-	u8 data[27];
-};
-
-ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
-				   void *buffer, size_t size);
-
 enum hdmi_3d_structure {
 	HDMI_3D_STRUCTURE_INVALID = -1,
 	HDMI_3D_STRUCTURE_FRAME_PACKING = 0,
···
 	enum hdmi_infoframe_type type;
 	unsigned char version;
 	unsigned char length;
+	unsigned int oui;
 	u8 vic;
 	enum hdmi_3d_structure s3d_struct;
 	unsigned int s3d_ext_data;
···
 ssize_t hdmi_hdmi_infoframe_pack(struct hdmi_hdmi_infoframe *frame,
 				 void *buffer, size_t size);
 
+union hdmi_vendor_infoframe {
+	struct {
+		enum hdmi_infoframe_type type;
+		unsigned char version;
+		unsigned char length;
+		unsigned int oui;
+	} any;
+	struct hdmi_hdmi_infoframe hdmi;
+};
+
 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_hdmi_infoframe hdmi;
+	union hdmi_vendor_infoframe vendor;
 	struct hdmi_audio_infoframe audio;
 };