mirror of
https://github.com/szehl/ath9k-hmac.git
synced 2024-12-24 15:57:11 +00:00
162 lines
6.7 KiB
C
162 lines
6.7 KiB
C
/*
|
|
* 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_timings_presets: list of all dv_timings presets.
|
|
*/
|
|
extern const struct v4l2_dv_timings v4l2_dv_timings_presets[];
|
|
|
|
/** v4l2_check_dv_timings_fnc - timings check callback
|
|
* @t: the v4l2_dv_timings struct.
|
|
* @handle: a handle from the driver.
|
|
*
|
|
* Returns true if the given timings are valid.
|
|
*/
|
|
typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);
|
|
|
|
/** v4l2_valid_dv_timings() - are these timings valid?
|
|
* @t: the v4l2_dv_timings struct.
|
|
* @cap: the v4l2_dv_timings_cap capabilities.
|
|
* @fnc: callback to check if this timing is OK. May be NULL.
|
|
* @fnc_handle: a handle that is passed on to @fnc.
|
|
*
|
|
* Returns true if the given dv_timings struct is supported by the
|
|
* hardware capabilities and the callback function (if non-NULL), returns
|
|
* false otherwise.
|
|
*/
|
|
bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
|
|
const struct v4l2_dv_timings_cap *cap,
|
|
v4l2_check_dv_timings_fnc fnc,
|
|
void *fnc_handle);
|
|
|
|
/** 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.
|
|
* @fnc: callback to check if this timing is OK. May be NULL.
|
|
* @fnc_handle: a handle that is passed on to @fnc.
|
|
*
|
|
* 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 and the callback function (if non-NULL).
|
|
*
|
|
* 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_check_dv_timings_fnc fnc,
|
|
void *fnc_handle);
|
|
|
|
/** 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.
|
|
* @fnc: callback to check if a given timings struct is OK. May be NULL.
|
|
* @fnc_handle: a handle that is passed on to @fnc.
|
|
*
|
|
* 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 and the callback
|
|
* function (if non-NULL).
|
|
*
|
|
* 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,
|
|
v4l2_check_dv_timings_fnc fnc,
|
|
void *fnc_handle);
|
|
|
|
/** v4l2_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 v4l2_match_dv_timings(const struct v4l2_dv_timings *measured,
|
|
const struct v4l2_dv_timings *standard,
|
|
unsigned pclock_delta);
|
|
|
|
/** v4l2_print_dv_timings() - log the contents of a dv_timings struct
|
|
* @dev_prefix:device prefix for each log line.
|
|
* @prefix: additional prefix for each log line, may be NULL.
|
|
* @t: the timings data.
|
|
* @detailed: if true, give a detailed log.
|
|
*/
|
|
void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
|
|
const struct v4l2_dv_timings *t, bool detailed);
|
|
|
|
/** 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
|