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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);
/** 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
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