209 lines
7.8 KiB
C
209 lines
7.8 KiB
C
/*
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* v4l2-dv-timings - Internal header with dv-timings helper functions
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*
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* Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#ifndef __V4L2_DV_TIMINGS_H
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#define __V4L2_DV_TIMINGS_H
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#include <linux/videodev2.h>
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/*
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* v4l2_dv_timings_presets: list of all dv_timings presets.
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*/
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extern const struct v4l2_dv_timings v4l2_dv_timings_presets[];
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/**
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* typedef v4l2_check_dv_timings_fnc - timings check callback
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*
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* @t: the v4l2_dv_timings struct.
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* @handle: a handle from the driver.
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*
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* Returns true if the given timings are valid.
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*/
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typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);
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/**
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* v4l2_valid_dv_timings() - are these timings valid?
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*
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* @t: the v4l2_dv_timings struct.
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* @cap: the v4l2_dv_timings_cap capabilities.
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* @fnc: callback to check if this timing is OK. May be NULL.
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* @fnc_handle: a handle that is passed on to @fnc.
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*
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* Returns true if the given dv_timings struct is supported by the
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* hardware capabilities and the callback function (if non-NULL), returns
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* false otherwise.
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*/
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bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
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const struct v4l2_dv_timings_cap *cap,
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v4l2_check_dv_timings_fnc fnc,
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void *fnc_handle);
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/**
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* v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV
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* timings based on capabilities
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*
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* @t: the v4l2_enum_dv_timings struct.
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* @cap: the v4l2_dv_timings_cap capabilities.
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* @fnc: callback to check if this timing is OK. May be NULL.
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* @fnc_handle: a handle that is passed on to @fnc.
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*
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* This enumerates dv_timings using the full list of possible CEA-861 and DMT
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* timings, filtering out any timings that are not supported based on the
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* hardware capabilities and the callback function (if non-NULL).
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*
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* If a valid timing for the given index is found, it will fill in @t and
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* return 0, otherwise it returns -EINVAL.
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*/
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int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
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const struct v4l2_dv_timings_cap *cap,
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v4l2_check_dv_timings_fnc fnc,
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void *fnc_handle);
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/**
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* v4l2_find_dv_timings_cap() - Find the closest timings struct
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*
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* @t: the v4l2_enum_dv_timings struct.
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* @cap: the v4l2_dv_timings_cap capabilities.
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* @pclock_delta: maximum delta between t->pixelclock and the timing struct
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* under consideration.
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* @fnc: callback to check if a given timings struct is OK. May be NULL.
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* @fnc_handle: a handle that is passed on to @fnc.
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*
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* This function tries to map the given timings to an entry in the
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* full list of possible CEA-861 and DMT timings, filtering out any timings
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* that are not supported based on the hardware capabilities and the callback
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* function (if non-NULL).
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*
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* On success it will fill in @t with the found timings and it returns true.
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* On failure it will return false.
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*/
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bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
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const struct v4l2_dv_timings_cap *cap,
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unsigned pclock_delta,
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v4l2_check_dv_timings_fnc fnc,
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void *fnc_handle);
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/**
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* v4l2_match_dv_timings() - do two timings match?
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*
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* @measured: the measured timings data.
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* @standard: the timings according to the standard.
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* @pclock_delta: maximum delta in Hz between standard->pixelclock and
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* the measured timings.
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* @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
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* match.
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*
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* Returns true if the two timings match, returns false otherwise.
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*/
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bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured,
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const struct v4l2_dv_timings *standard,
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unsigned pclock_delta, bool match_reduced_fps);
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/**
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* v4l2_print_dv_timings() - log the contents of a dv_timings struct
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* @dev_prefix:device prefix for each log line.
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* @prefix: additional prefix for each log line, may be NULL.
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* @t: the timings data.
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* @detailed: if true, give a detailed log.
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*/
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void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
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const struct v4l2_dv_timings *t, bool detailed);
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/**
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* v4l2_detect_cvt - detect if the given timings follow the CVT standard
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*
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* @frame_height: the total height of the frame (including blanking) in lines.
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* @hfreq: the horizontal frequency in Hz.
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* @vsync: the height of the vertical sync in lines.
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* @active_width: active width of image (does not include blanking). This
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* information is needed only in case of version 2 of reduced blanking.
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* In other cases, this parameter does not have any effect on timings.
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* @polarities: the horizontal and vertical polarities (same as struct
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* v4l2_bt_timings polarities).
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* @interlaced: if this flag is true, it indicates interlaced format
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* @fmt: the resulting timings.
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*
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* This function will attempt to detect if the given values correspond to a
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* valid CVT format. If so, then it will return true, and fmt will be filled
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* in with the found CVT timings.
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*/
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bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
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unsigned active_width, u32 polarities, bool interlaced,
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struct v4l2_dv_timings *fmt);
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/**
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* v4l2_detect_gtf - detect if the given timings follow the GTF standard
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*
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* @frame_height: the total height of the frame (including blanking) in lines.
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* @hfreq: the horizontal frequency in Hz.
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* @vsync: the height of the vertical sync in lines.
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* @polarities: the horizontal and vertical polarities (same as struct
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* v4l2_bt_timings polarities).
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* @interlaced: if this flag is true, it indicates interlaced format
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* @aspect: preferred aspect ratio. GTF has no method of determining the
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* aspect ratio in order to derive the image width from the
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* image height, so it has to be passed explicitly. Usually
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* the native screen aspect ratio is used for this. If it
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* is not filled in correctly, then 16:9 will be assumed.
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* @fmt: the resulting timings.
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*
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* This function will attempt to detect if the given values correspond to a
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* valid GTF format. If so, then it will return true, and fmt will be filled
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* in with the found GTF timings.
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*/
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bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
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u32 polarities, bool interlaced, struct v4l2_fract aspect,
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struct v4l2_dv_timings *fmt);
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/**
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* v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
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* 0x15 and 0x16 from the EDID.
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*
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* @hor_landscape: byte 0x15 from the EDID.
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* @vert_portrait: byte 0x16 from the EDID.
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*
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* Determines the aspect ratio from the EDID.
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* See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
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* "Horizontal and Vertical Screen Size or Aspect Ratio"
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*/
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struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
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/*
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* reduce_fps - check if conditions for reduced fps are true.
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* bt - v4l2 timing structure
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* For different timings reduced fps is allowed if following conditions
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* are met -
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* For CVT timings: if reduced blanking v2 (vsync == 8) is true.
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* For CEA861 timings: if V4L2_DV_FL_CAN_REDUCE_FPS flag is true.
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*/
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static inline bool can_reduce_fps(struct v4l2_bt_timings *bt)
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{
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if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8))
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return true;
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if ((bt->standards & V4L2_DV_BT_STD_CEA861) &&
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(bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS))
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return true;
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return false;
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}
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#endif
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