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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_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