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authorHans Verkuil <hans.verkuil@cisco.com>2013-07-29 15:40:55 +0400
committerMauro Carvalho Chehab <m.chehab@samsung.com>2013-08-18 15:15:46 +0400
commitb18787ed1ce32eb0c2ce2323220abd4ed93c4b97 (patch)
tree932f4aca5286fa7681add52b0be6151e2d5b6edf /include/media/v4l2-dv-timings.h
parent299878fa3c373dbf74edf5872c79ef4c65b80a04 (diff)
downloadlinux-b18787ed1ce32eb0c2ce2323220abd4ed93c4b97.tar.xz
[media] v4l2-dv-timings: add new helper module
This module makes it easy to filter valid timings from the full list of CEA and DMT timings based on the timings capabilities. 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.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h
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+++ b/include/media/v4l2-dv-timings.h
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+/*
+ * v4l2-dv-timings - Internal header with dv-timings helper functions
+ *
+ * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef __V4L2_DV_TIMINGS_H
+#define __V4L2_DV_TIMINGS_H
+
+#include <linux/videodev2.h>
+
+/** v4l2_dv_valid_timings() - are these timings valid?
+ * @t: the v4l2_dv_timings struct.
+ * @cap: the v4l2_dv_timings_cap capabilities.
+ *
+ * Returns true if the given dv_timings struct is supported by the
+ * hardware capabilities, returns false otherwise.
+ */
+bool v4l2_dv_valid_timings(const struct v4l2_dv_timings *t,
+ const struct v4l2_dv_timings_cap *cap);
+
+/** v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV timings based on capabilities
+ * @t: the v4l2_enum_dv_timings struct.
+ * @cap: the v4l2_dv_timings_cap capabilities.
+ *
+ * This enumerates dv_timings using the full list of possible CEA-861 and DMT
+ * timings, filtering out any timings that are not supported based on the
+ * hardware capabilities.
+ *
+ * If a valid timing for the given index is found, it will fill in @t and
+ * return 0, otherwise it returns -EINVAL.
+ */
+int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
+ const struct v4l2_dv_timings_cap *cap);
+
+/** v4l2_find_dv_timings_cap() - Find the closest timings struct
+ * @t: the v4l2_enum_dv_timings struct.
+ * @cap: the v4l2_dv_timings_cap capabilities.
+ * @pclock_delta: maximum delta between t->pixelclock and the timing struct
+ * under consideration.
+ *
+ * This function tries to map the given timings to an entry in the
+ * full list of possible CEA-861 and DMT timings, filtering out any timings
+ * that are not supported based on the hardware capabilities.
+ *
+ * On success it will fill in @t with the found timings and it returns true.
+ * On failure it will return false.
+ */
+bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
+ const struct v4l2_dv_timings_cap *cap,
+ unsigned pclock_delta);
+
+#endif