From b18787ed1ce32eb0c2ce2323220abd4ed93c4b97 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Mon, 29 Jul 2013 08:40:55 -0300 Subject: [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 Acked-by: Lad, Prabhakar Signed-off-by: Mauro Carvalho Chehab --- include/media/v4l2-dv-timings.h | 67 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 include/media/v4l2-dv-timings.h (limited to 'include/media/v4l2-dv-timings.h') diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h new file mode 100644 index 000000000000..41075fa02a96 --- /dev/null +++ b/include/media/v4l2-dv-timings.h @@ -0,0 +1,67 @@ +/* + * 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 + +/** 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 -- cgit v1.2.3-59-g8ed1b