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path: root/drivers/video/hdmi.c
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Diffstat (limited to 'drivers/video/hdmi.c')
-rw-r--r--drivers/video/hdmi.c57
1 files changed, 50 insertions, 7 deletions
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 40178338b619..635d5690dd5a 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>
@@ -52,7 +53,7 @@ int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
frame->type = HDMI_INFOFRAME_TYPE_AVI;
frame->version = 2;
- frame->length = 13;
+ frame->length = HDMI_AVI_INFOFRAME_SIZE;
return 0;
}
@@ -83,7 +84,7 @@ ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
if (size < length)
return -ENOSPC;
- memset(buffer, 0, length);
+ memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
@@ -151,7 +152,7 @@ int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
frame->type = HDMI_INFOFRAME_TYPE_SPD;
frame->version = 1;
- frame->length = 25;
+ frame->length = HDMI_SPD_INFOFRAME_SIZE;
strncpy(frame->vendor, vendor, sizeof(frame->vendor));
strncpy(frame->product, product, sizeof(frame->product));
@@ -185,7 +186,7 @@ ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
if (size < length)
return -ENOSPC;
- memset(buffer, 0, length);
+ memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
@@ -218,7 +219,7 @@ int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
frame->version = 1;
- frame->length = 10;
+ frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
return 0;
}
@@ -250,7 +251,7 @@ ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
if (size < length)
return -ENOSPC;
- memset(buffer, 0, length);
+ memset(buffer, 0, size);
if (frame->channels >= 2)
channels = frame->channels - 1;
@@ -307,7 +308,7 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
if (size < length)
return -ENOSPC;
- memset(buffer, 0, length);
+ memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
@@ -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);