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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * v4l2-dv-timings - Internal header with dv-timings helper functions
4 *
5 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
8#ifndef __V4L2_DV_TIMINGS_H
9#define __V4L2_DV_TIMINGS_H
10
11#include <linux/debugfs.h>
12#include <linux/videodev2.h>
13
14/**
15 * v4l2_calc_timeperframe - helper function to calculate timeperframe based
16 * v4l2_dv_timings fields.
17 * @t: Timings for the video mode.
18 *
19 * Calculates the expected timeperframe using the pixel clock value and
20 * horizontal/vertical measures. This means that v4l2_dv_timings structure
21 * must be correctly and fully filled.
22 */
23struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t);
24
25/*
26 * v4l2_dv_timings_presets: list of all dv_timings presets.
27 */
28extern const struct v4l2_dv_timings v4l2_dv_timings_presets[];
29
30/**
31 * typedef v4l2_check_dv_timings_fnc - timings check callback
32 *
33 * @t: the v4l2_dv_timings struct.
34 * @handle: a handle from the driver.
35 *
36 * Returns true if the given timings are valid.
37 */
38typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);
39
40/**
41 * v4l2_valid_dv_timings() - are these timings valid?
42 *
43 * @t: the v4l2_dv_timings struct.
44 * @cap: the v4l2_dv_timings_cap capabilities.
45 * @fnc: callback to check if this timing is OK. May be NULL.
46 * @fnc_handle: a handle that is passed on to @fnc.
47 *
48 * Returns true if the given dv_timings struct is supported by the
49 * hardware capabilities and the callback function (if non-NULL), returns
50 * false otherwise.
51 */
52bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
53 const struct v4l2_dv_timings_cap *cap,
54 v4l2_check_dv_timings_fnc fnc,
55 void *fnc_handle);
56
57/**
58 * v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV
59 * timings based on capabilities
60 *
61 * @t: the v4l2_enum_dv_timings struct.
62 * @cap: the v4l2_dv_timings_cap capabilities.
63 * @fnc: callback to check if this timing is OK. May be NULL.
64 * @fnc_handle: a handle that is passed on to @fnc.
65 *
66 * This enumerates dv_timings using the full list of possible CEA-861 and DMT
67 * timings, filtering out any timings that are not supported based on the
68 * hardware capabilities and the callback function (if non-NULL).
69 *
70 * If a valid timing for the given index is found, it will fill in @t and
71 * return 0, otherwise it returns -EINVAL.
72 */
73int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
74 const struct v4l2_dv_timings_cap *cap,
75 v4l2_check_dv_timings_fnc fnc,
76 void *fnc_handle);
77
78/**
79 * v4l2_find_dv_timings_cap() - Find the closest timings struct
80 *
81 * @t: the v4l2_enum_dv_timings struct.
82 * @cap: the v4l2_dv_timings_cap capabilities.
83 * @pclock_delta: maximum delta between t->pixelclock and the timing struct
84 * under consideration.
85 * @fnc: callback to check if a given timings struct is OK. May be NULL.
86 * @fnc_handle: a handle that is passed on to @fnc.
87 *
88 * This function tries to map the given timings to an entry in the
89 * full list of possible CEA-861 and DMT timings, filtering out any timings
90 * that are not supported based on the hardware capabilities and the callback
91 * function (if non-NULL).
92 *
93 * On success it will fill in @t with the found timings and it returns true.
94 * On failure it will return false.
95 */
96bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
97 const struct v4l2_dv_timings_cap *cap,
98 unsigned pclock_delta,
99 v4l2_check_dv_timings_fnc fnc,
100 void *fnc_handle);
101
102/**
103 * v4l2_find_dv_timings_cea861_vic() - find timings based on CEA-861 VIC
104 * @t: the timings data.
105 * @vic: CEA-861 VIC code
106 *
107 * On success it will fill in @t with the found timings and it returns true.
108 * On failure it will return false.
109 */
110bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic);
111
112/**
113 * v4l2_match_dv_timings() - do two timings match?
114 *
115 * @measured: the measured timings data.
116 * @standard: the timings according to the standard.
117 * @pclock_delta: maximum delta in Hz between standard->pixelclock and
118 * the measured timings.
119 * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
120 * match.
121 *
122 * Returns true if the two timings match, returns false otherwise.
123 */
124bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured,
125 const struct v4l2_dv_timings *standard,
126 unsigned pclock_delta, bool match_reduced_fps);
127
128/**
129 * v4l2_print_dv_timings() - log the contents of a dv_timings struct
130 * @dev_prefix:device prefix for each log line.
131 * @prefix: additional prefix for each log line, may be NULL.
132 * @t: the timings data.
133 * @detailed: if true, give a detailed log.
134 */
135void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
136 const struct v4l2_dv_timings *t, bool detailed);
137
138/**
139 * v4l2_detect_cvt - detect if the given timings follow the CVT standard
140 *
141 * @frame_height: the total height of the frame (including blanking) in lines.
142 * @hfreq: the horizontal frequency in Hz.
143 * @vsync: the height of the vertical sync in lines.
144 * @active_width: active width of image (does not include blanking). This
145 * information is needed only in case of version 2 of reduced blanking.
146 * In other cases, this parameter does not have any effect on timings.
147 * @polarities: the horizontal and vertical polarities (same as struct
148 * v4l2_bt_timings polarities).
149 * @interlaced: if this flag is true, it indicates interlaced format
150 * @cap: the v4l2_dv_timings_cap capabilities.
151 * @fmt: the resulting timings.
152 *
153 * This function will attempt to detect if the given values correspond to a
154 * valid CVT format. If so, then it will return true, and fmt will be filled
155 * in with the found CVT timings.
156 */
157bool v4l2_detect_cvt(unsigned int frame_height, unsigned int hfreq,
158 unsigned int vsync, unsigned int active_width,
159 u32 polarities, bool interlaced,
160 const struct v4l2_dv_timings_cap *cap,
161 struct v4l2_dv_timings *fmt);
162
163/**
164 * v4l2_detect_gtf - detect if the given timings follow the GTF standard
165 *
166 * @frame_height: the total height of the frame (including blanking) in lines.
167 * @hfreq: the horizontal frequency in Hz.
168 * @vsync: the height of the vertical sync in lines.
169 * @polarities: the horizontal and vertical polarities (same as struct
170 * v4l2_bt_timings polarities).
171 * @interlaced: if this flag is true, it indicates interlaced format
172 * @aspect: preferred aspect ratio. GTF has no method of determining the
173 * aspect ratio in order to derive the image width from the
174 * image height, so it has to be passed explicitly. Usually
175 * the native screen aspect ratio is used for this. If it
176 * is not filled in correctly, then 16:9 will be assumed.
177 * @cap: the v4l2_dv_timings_cap capabilities.
178 * @fmt: the resulting timings.
179 *
180 * This function will attempt to detect if the given values correspond to a
181 * valid GTF format. If so, then it will return true, and fmt will be filled
182 * in with the found GTF timings.
183 */
184bool v4l2_detect_gtf(unsigned int frame_height, unsigned int hfreq,
185 unsigned int vsync, u32 polarities, bool interlaced,
186 struct v4l2_fract aspect,
187 const struct v4l2_dv_timings_cap *cap,
188 struct v4l2_dv_timings *fmt);
189
190/**
191 * v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
192 * 0x15 and 0x16 from the EDID.
193 *
194 * @hor_landscape: byte 0x15 from the EDID.
195 * @vert_portrait: byte 0x16 from the EDID.
196 *
197 * Determines the aspect ratio from the EDID.
198 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
199 * "Horizontal and Vertical Screen Size or Aspect Ratio"
200 */
201struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
202
203/**
204 * v4l2_dv_timings_aspect_ratio - calculate the aspect ratio based on the
205 * v4l2_dv_timings information.
206 *
207 * @t: the timings data.
208 */
209struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t);
210
211/**
212 * can_reduce_fps - check if conditions for reduced fps are true.
213 * @bt: v4l2 timing structure
214 *
215 * For different timings reduced fps is allowed if the following conditions
216 * are met:
217 *
218 * - For CVT timings: if reduced blanking v2 (vsync == 8) is true.
219 * - For CEA861 timings: if %V4L2_DV_FL_CAN_REDUCE_FPS flag is true.
220 */
221static inline bool can_reduce_fps(struct v4l2_bt_timings *bt)
222{
223 if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8))
224 return true;
225
226 if ((bt->standards & V4L2_DV_BT_STD_CEA861) &&
227 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS))
228 return true;
229
230 return false;
231}
232
233/**
234 * struct v4l2_hdmi_colorimetry - describes the HDMI colorimetry information
235 * @colorspace: enum v4l2_colorspace, the colorspace
236 * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
237 * @quantization: enum v4l2_quantization, colorspace quantization
238 * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
239 */
240struct v4l2_hdmi_colorimetry {
241 enum v4l2_colorspace colorspace;
242 enum v4l2_ycbcr_encoding ycbcr_enc;
243 enum v4l2_quantization quantization;
244 enum v4l2_xfer_func xfer_func;
245};
246
247struct hdmi_avi_infoframe;
248struct hdmi_vendor_infoframe;
249
250struct v4l2_hdmi_colorimetry
251v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
252 const struct hdmi_vendor_infoframe *hdmi,
253 unsigned int height);
254
255u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
256 unsigned int *offset);
257void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);
258u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input);
259int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port);
260
261/* Add support for exporting InfoFrames to debugfs */
262
263/*
264 * HDMI InfoFrames start with a 3 byte header, then a checksum,
265 * followed by the actual IF payload.
266 *
267 * The payload length is limited to 30 bytes according to the HDMI spec,
268 * but since the length is encoded in 5 bits, it can be 31 bytes theoretically.
269 * So set the max length as 31 + 3 (header) + 1 (checksum) = 35.
270 */
271#define V4L2_DEBUGFS_IF_MAX_LEN (35)
272
273#define V4L2_DEBUGFS_IF_AVI BIT(0)
274#define V4L2_DEBUGFS_IF_AUDIO BIT(1)
275#define V4L2_DEBUGFS_IF_SPD BIT(2)
276#define V4L2_DEBUGFS_IF_HDMI BIT(3)
277
278typedef ssize_t (*v4l2_debugfs_if_read_t)(u32 type, void *priv,
279 struct file *filp, char __user *ubuf,
280 size_t count, loff_t *ppos);
281
282struct v4l2_debugfs_if {
283 struct dentry *if_dir;
284 void *priv;
285
286 v4l2_debugfs_if_read_t if_read;
287};
288
289#ifdef CONFIG_DEBUG_FS
290struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
291 void *priv,
292 v4l2_debugfs_if_read_t if_read);
293void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes);
294#else
295static inline
296struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
297 void *priv,
298 v4l2_debugfs_if_read_t if_read)
299{
300 return NULL;
301}
302
303static inline void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes)
304{
305}
306#endif
307
308#endif
1/*
2 * v4l2-dv-timings - Internal header with dv-timings helper functions
3 *
4 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 *
19 */
20
21#ifndef __V4L2_DV_TIMINGS_H
22#define __V4L2_DV_TIMINGS_H
23
24#include <linux/videodev2.h>
25
26/** v4l2_dv_timings_presets: list of all dv_timings presets.
27 */
28extern const struct v4l2_dv_timings v4l2_dv_timings_presets[];
29
30/** v4l2_check_dv_timings_fnc - timings check callback
31 * @t: the v4l2_dv_timings struct.
32 * @handle: a handle from the driver.
33 *
34 * Returns true if the given timings are valid.
35 */
36typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);
37
38/** v4l2_valid_dv_timings() - are these timings valid?
39 * @t: the v4l2_dv_timings struct.
40 * @cap: the v4l2_dv_timings_cap capabilities.
41 * @fnc: callback to check if this timing is OK. May be NULL.
42 * @fnc_handle: a handle that is passed on to @fnc.
43 *
44 * Returns true if the given dv_timings struct is supported by the
45 * hardware capabilities and the callback function (if non-NULL), returns
46 * false otherwise.
47 */
48bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
49 const struct v4l2_dv_timings_cap *cap,
50 v4l2_check_dv_timings_fnc fnc,
51 void *fnc_handle);
52
53/** v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV timings based on capabilities
54 * @t: the v4l2_enum_dv_timings struct.
55 * @cap: the v4l2_dv_timings_cap capabilities.
56 * @fnc: callback to check if this timing is OK. May be NULL.
57 * @fnc_handle: a handle that is passed on to @fnc.
58 *
59 * This enumerates dv_timings using the full list of possible CEA-861 and DMT
60 * timings, filtering out any timings that are not supported based on the
61 * hardware capabilities and the callback function (if non-NULL).
62 *
63 * If a valid timing for the given index is found, it will fill in @t and
64 * return 0, otherwise it returns -EINVAL.
65 */
66int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
67 const struct v4l2_dv_timings_cap *cap,
68 v4l2_check_dv_timings_fnc fnc,
69 void *fnc_handle);
70
71/** v4l2_find_dv_timings_cap() - Find the closest timings struct
72 * @t: the v4l2_enum_dv_timings struct.
73 * @cap: the v4l2_dv_timings_cap capabilities.
74 * @pclock_delta: maximum delta between t->pixelclock and the timing struct
75 * under consideration.
76 * @fnc: callback to check if a given timings struct is OK. May be NULL.
77 * @fnc_handle: a handle that is passed on to @fnc.
78 *
79 * This function tries to map the given timings to an entry in the
80 * full list of possible CEA-861 and DMT timings, filtering out any timings
81 * that are not supported based on the hardware capabilities and the callback
82 * function (if non-NULL).
83 *
84 * On success it will fill in @t with the found timings and it returns true.
85 * On failure it will return false.
86 */
87bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
88 const struct v4l2_dv_timings_cap *cap,
89 unsigned pclock_delta,
90 v4l2_check_dv_timings_fnc fnc,
91 void *fnc_handle);
92
93/** v4l2_match_dv_timings() - do two timings match?
94 * @measured: the measured timings data.
95 * @standard: the timings according to the standard.
96 * @pclock_delta: maximum delta in Hz between standard->pixelclock and
97 * the measured timings.
98 *
99 * Returns true if the two timings match, returns false otherwise.
100 */
101bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured,
102 const struct v4l2_dv_timings *standard,
103 unsigned pclock_delta);
104
105/** v4l2_print_dv_timings() - log the contents of a dv_timings struct
106 * @dev_prefix:device prefix for each log line.
107 * @prefix: additional prefix for each log line, may be NULL.
108 * @t: the timings data.
109 * @detailed: if true, give a detailed log.
110 */
111void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
112 const struct v4l2_dv_timings *t, bool detailed);
113
114/** v4l2_detect_cvt - detect if the given timings follow the CVT standard
115 * @frame_height - the total height of the frame (including blanking) in lines.
116 * @hfreq - the horizontal frequency in Hz.
117 * @vsync - the height of the vertical sync in lines.
118 * @polarities - the horizontal and vertical polarities (same as struct
119 * v4l2_bt_timings polarities).
120 * @fmt - the resulting timings.
121 *
122 * This function will attempt to detect if the given values correspond to a
123 * valid CVT format. If so, then it will return true, and fmt will be filled
124 * in with the found CVT timings.
125 */
126bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
127 u32 polarities, struct v4l2_dv_timings *fmt);
128
129/** v4l2_detect_gtf - detect if the given timings follow the GTF standard
130 * @frame_height - the total height of the frame (including blanking) in lines.
131 * @hfreq - the horizontal frequency in Hz.
132 * @vsync - the height of the vertical sync in lines.
133 * @polarities - the horizontal and vertical polarities (same as struct
134 * v4l2_bt_timings polarities).
135 * @aspect - preferred aspect ratio. GTF has no method of determining the
136 * aspect ratio in order to derive the image width from the
137 * image height, so it has to be passed explicitly. Usually
138 * the native screen aspect ratio is used for this. If it
139 * is not filled in correctly, then 16:9 will be assumed.
140 * @fmt - the resulting timings.
141 *
142 * This function will attempt to detect if the given values correspond to a
143 * valid GTF format. If so, then it will return true, and fmt will be filled
144 * in with the found GTF timings.
145 */
146bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
147 u32 polarities, struct v4l2_fract aspect,
148 struct v4l2_dv_timings *fmt);
149
150/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
151 * 0x15 and 0x16 from the EDID.
152 * @hor_landscape - byte 0x15 from the EDID.
153 * @vert_portrait - byte 0x16 from the EDID.
154 *
155 * Determines the aspect ratio from the EDID.
156 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
157 * "Horizontal and Vertical Screen Size or Aspect Ratio"
158 */
159struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
160
161#endif