[PATCH 10/12] video/hdmi: Hook the HDMI vendor infoframe with the generic _pack()

Damien Lespiau
2013-08-13T23:17:26Z

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 <damien.lespiau@intel.com>
Date: Mon Aug 12 18:08:37 2013 +0100

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

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
drivers/video/hdmi.c | 45 +++++++++------------------------------------
include/linux/hdmi.h | 24 ++++++++++++------------
2 files changed, 21 insertions(+), 48 deletions(-)

diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 2059f7b..073f005 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -300,6 +300,7 @@ int hdmi_hdmi_infoframe_init(struct hdmi_hdmi_infoframe *frame)
frame->length = 5; /* we can hardcode the size for now as we don't
support neither 3D_Ext_Data nor 3D_Metadata_* */

+ frame->oui = HDMI_IDENTIFIER;
/* 0 is a valid value for s3d_struct, so we use a special "not set"
* value */
frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
@@ -367,46 +368,18 @@ ssize_t hdmi_hdmi_infoframe_pack(struct hdmi_hdmi_infoframe *frame,
}
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;
-
- 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);
+ /* we only know about HDMI vendor infoframes */
+ if (frame->any.oui != HDMI_IDENTIFIER)
+ return -EINVAL;

- 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
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index 53bbf0d..5c572e9 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -225,16 +225,6 @@ int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame);
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,
@@ -251,6 +241,7 @@ struct hdmi_hdmi_infoframe {
enum hdmi_infoframe_type type;
unsigned char version;
unsigned char length;
+ int oui;
u8 vic;
enum hdmi_3d_structure s3d_struct;
};
@@ -259,12 +250,21 @@ int hdmi_hdmi_infoframe_init(struct hdmi_hdmi_infoframe *frame);
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;
+ 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;
};

--
1.8.3.1