include/media/v4l2-dv-timings.h - kernel/msm-5.4 - Gitiles

 /*
  * 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[];

 /**
  * typedef 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_find_dv_timings_cea861_vic() - find timings based on CEA-861 VIC
  * @t:		the timings data.
  * @vic:	CEA-861 VIC code
  *
  * 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_cea861_vic(struct v4l2_dv_timings *t, u8 vic);

 /**
  * 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.
  * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
  * match.
  *
  * 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, bool match_reduced_fps);

 /**
  * 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.
  * @active_width: active width of image (does not include blanking). This
  * information is needed only in case of version 2 of reduced blanking.
  * In other cases, this parameter does not have any effect on timings.
  * @polarities: the horizontal and vertical polarities (same as struct
  *		v4l2_bt_timings polarities).
  * @interlaced: if this flag is true, it indicates interlaced format
  * @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,
 		unsigned active_width, u32 polarities, bool interlaced,
 		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).
  * @interlaced: if this flag is true, it indicates interlaced format
  * @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, bool interlaced, 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);

 /**
  * v4l2_dv_timings_aspect_ratio - calculate the aspect ratio based on the
  *	v4l2_dv_timings information.
  *
  * @t: the timings data.
  */
 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t);

 /**
  * can_reduce_fps - check if conditions for reduced fps are true.
  * @bt: v4l2 timing structure
  *
  * For different timings reduced fps is allowed if the following conditions
  * are met:
  *
  *   - For CVT timings: if reduced blanking v2 (vsync == 8) is true.
  *   - For CEA861 timings: if %V4L2_DV_FL_CAN_REDUCE_FPS flag is true.
  */
 static inline  bool can_reduce_fps(struct v4l2_bt_timings *bt)
 {
 	if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8))
 		return true;

 	if ((bt->standards & V4L2_DV_BT_STD_CEA861) &&
 	    (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS))
 		return true;

 	return false;
 }


 #endif
	/*
	* 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[];

	/**
	* typedef 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_find_dv_timings_cea861_vic() - find timings based on CEA-861 VIC
	* @t: the timings data.
	* @vic: CEA-861 VIC code
	*
	* 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_cea861_vic(struct v4l2_dv_timings *t, u8 vic);

	/**
	* 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.
	* @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
	* match.
	*
	* 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, bool match_reduced_fps);

	/**
	* 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.
	* @active_width: active width of image (does not include blanking). This
	* information is needed only in case of version 2 of reduced blanking.
	* In other cases, this parameter does not have any effect on timings.
	* @polarities: the horizontal and vertical polarities (same as struct
	* v4l2_bt_timings polarities).
	* @interlaced: if this flag is true, it indicates interlaced format
	* @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,
	unsigned active_width, u32 polarities, bool interlaced,
	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).
	* @interlaced: if this flag is true, it indicates interlaced format
	* @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, bool interlaced, 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);

	/**
	* v4l2_dv_timings_aspect_ratio - calculate the aspect ratio based on the
	* v4l2_dv_timings information.
	*
	* @t: the timings data.
	*/
	struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t);

	/**
	* can_reduce_fps - check if conditions for reduced fps are true.
	* @bt: v4l2 timing structure
	*
	* For different timings reduced fps is allowed if the following conditions
	* are met:
	*
	* - For CVT timings: if reduced blanking v2 (vsync == 8) is true.
	* - For CEA861 timings: if %V4L2_DV_FL_CAN_REDUCE_FPS flag is true.
	*/
	static inline bool can_reduce_fps(struct v4l2_bt_timings *bt)
	{
	if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8))
	return true;

	if ((bt->standards & V4L2_DV_BT_STD_CEA861) &&
	(bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS))
	return true;

	return false;
	}


	#endif