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authorHans Verkuil <hans.verkuil@cisco.com>2013-07-29 08:40:56 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2013-08-18 08:16:54 -0300
commit2576415846bcbad3c0a6885fc44f950837106364 (patch)
tree99772fbb135740430c638fc3eb6aa91f0a6f751a /include/media/v4l2-dv-timings.h
parentb18787ed1ce32eb0c2ce2323220abd4ed93c4b97 (diff)
[media] v4l2: move dv-timings related code to v4l2-dv-timings.c
v4l2-common.c contained a bunch of dv-timings related functions. Move that to the new v4l2-dv-timings.c which is a more appropriate place for them. There aren't many drivers that do HDTV, so it is a good idea to separate common code related to that into a module of its own. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'include/media/v4l2-dv-timings.h')
-rw-r--r--include/media/v4l2-dv-timings.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h
index 41075fa02a96..4c7bb5491658 100644
--- a/include/media/v4l2-dv-timings.h
+++ b/include/media/v4l2-dv-timings.h
@@ -64,4 +64,63 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
const struct v4l2_dv_timings_cap *cap,
unsigned pclock_delta);
+/** v4l_match_dv_timings() - do two timings match?
+ * @measured: the measured timings data.
+ * @standard: the timings according to the standard.
+ * @pclock_delta: maximum delta in Hz between standard->pixelclock and
+ * the measured timings.
+ *
+ * Returns true if the two timings match, returns false otherwise.
+ */
+bool v4l_match_dv_timings(const struct v4l2_dv_timings *measured,
+ const struct v4l2_dv_timings *standard,
+ unsigned pclock_delta);
+
+/** v4l2_detect_cvt - detect if the given timings follow the CVT standard
+ * @frame_height - the total height of the frame (including blanking) in lines.
+ * @hfreq - the horizontal frequency in Hz.
+ * @vsync - the height of the vertical sync in lines.
+ * @polarities - the horizontal and vertical polarities (same as struct
+ * v4l2_bt_timings polarities).
+ * @fmt - the resulting timings.
+ *
+ * This function will attempt to detect if the given values correspond to a
+ * valid CVT format. If so, then it will return true, and fmt will be filled
+ * in with the found CVT timings.
+ */
+bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
+ u32 polarities, struct v4l2_dv_timings *fmt);
+
+/** v4l2_detect_gtf - detect if the given timings follow the GTF standard
+ * @frame_height - the total height of the frame (including blanking) in lines.
+ * @hfreq - the horizontal frequency in Hz.
+ * @vsync - the height of the vertical sync in lines.
+ * @polarities - the horizontal and vertical polarities (same as struct
+ * v4l2_bt_timings polarities).
+ * @aspect - preferred aspect ratio. GTF has no method of determining the
+ * aspect ratio in order to derive the image width from the
+ * image height, so it has to be passed explicitly. Usually
+ * the native screen aspect ratio is used for this. If it
+ * is not filled in correctly, then 16:9 will be assumed.
+ * @fmt - the resulting timings.
+ *
+ * This function will attempt to detect if the given values correspond to a
+ * valid GTF format. If so, then it will return true, and fmt will be filled
+ * in with the found GTF timings.
+ */
+bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
+ u32 polarities, struct v4l2_fract aspect,
+ struct v4l2_dv_timings *fmt);
+
+/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
+ * 0x15 and 0x16 from the EDID.
+ * @hor_landscape - byte 0x15 from the EDID.
+ * @vert_portrait - byte 0x16 from the EDID.
+ *
+ * Determines the aspect ratio from the EDID.
+ * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
+ * "Horizontal and Vertical Screen Size or Aspect Ratio"
+ */
+struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
+
#endif