/* SPDX-License-Identifier: GPL-2.0-only */
/*
* v4l2-dv-timings - Internal header with dv-timings helper functions
*
* Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*/
#ifndef __V4L2_DV_TIMINGS_H
#define __V4L2_DV_TIMINGS_H
#include <linux/debugfs.h>
#include <linux/videodev2.h>
/**
* v4l2_calc_timeperframe - helper function to calculate timeperframe based
* v4l2_dv_timings fields.
* @t: Timings for the video mode.
*
* Calculates the expected timeperframe using the pixel clock value and
* horizontal/vertical measures. This means that v4l2_dv_timings structure
* must be correctly and fully filled.
*/
struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t);
/*
* 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
* @cap: the v4l2_dv_timings_cap capabilities.
* @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 int frame_height, unsigned int hfreq,
unsigned int vsync, unsigned int active_width,
u32 polarities, bool interlaced,
const struct v4l2_dv_timings_cap *cap,
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.
* @cap: the v4l2_dv_timings_cap capabilities.
* @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 int frame_height, unsigned int hfreq,
unsigned int vsync, u32 polarities, bool interlaced,
struct v4l2_fract aspect,
const struct v4l2_dv_timings_cap *cap,
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;
}
/**
* struct v4l2_hdmi_colorimetry - describes the HDMI colorimetry information
* @colorspace: enum v4l2_colorspace, the colorspace
* @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
* @quantization: enum v4l2_quantization, colorspace quantization
* @xfer_func: enum v4l2_xfer_func, colorspace transfer function
*/
struct v4l2_hdmi_colorimetry {
enum v4l2_colorspace colorspace;
enum v4l2_ycbcr_encoding ycbcr_enc;
enum v4l2_quantization quantization;
enum v4l2_xfer_func xfer_func;
};
struct hdmi_avi_infoframe;
struct hdmi_vendor_infoframe;
struct v4l2_hdmi_colorimetry
v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
const struct hdmi_vendor_infoframe *hdmi,
unsigned int height);
u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
unsigned int *offset);
void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);
u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input);
int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port);
/* Add support for exporting InfoFrames to debugfs */
/*
* HDMI InfoFrames start with a 3 byte header, then a checksum,
* followed by the actual IF payload.
*
* The payload length is limited to 30 bytes according to the HDMI spec,
* but since the length is encoded in 5 bits, it can be 31 bytes theoretically.
* So set the max length as 31 + 3 (header) + 1 (checksum) = 35.
*/
#define V4L2_DEBUGFS_IF_MAX_LEN (35)
#define V4L2_DEBUGFS_IF_AVI BIT(0)
#define V4L2_DEBUGFS_IF_AUDIO BIT(1)
#define V4L2_DEBUGFS_IF_SPD BIT(2)
#define V4L2_DEBUGFS_IF_HDMI BIT(3)
typedef ssize_t (*v4l2_debugfs_if_read_t)(u32 type, void *priv,
struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos);
struct v4l2_debugfs_if {
struct dentry *if_dir;
void *priv;
v4l2_debugfs_if_read_t if_read;
};
#ifdef CONFIG_DEBUG_FS
struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
void *priv,
v4l2_debugfs_if_read_t if_read);
void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes);
#else
static inline
struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
void *priv,
v4l2_debugfs_if_read_t if_read)
{
return NULL;
}
static inline void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes)
{
}
#endif
#endif