diff options
author | Damien Lespiau <damien.lespiau@intel.com> | 2013-08-06 19:32:14 (GMT) |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-08-08 12:04:45 (GMT) |
commit | 72b098964d3c3fb030dcac2d4c869c9851a0d17a (patch) | |
tree | 12a53e67bc5563db2d91f0d89c788b2daa9bfd78 /drivers/video/hdmi.c | |
parent | 3c6b054de1c0243a0f708abf337f2a0e270ce247 (diff) | |
download | linux-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.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index dbd882f..f7a85e5 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); |