1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/module.h>
22#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/videodev2.h>
26#include <linux/v4l2-dv-timings.h>
27#include <media/v4l2-dv-timings.h>
28
29MODULE_AUTHOR("Hans Verkuil");
30MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
31MODULE_LICENSE("GPL");
32
33const struct v4l2_dv_timings v4l2_dv_timings_presets[] = {
34 V4L2_DV_BT_CEA_640X480P59_94,
35 V4L2_DV_BT_CEA_720X480I59_94,
36 V4L2_DV_BT_CEA_720X480P59_94,
37 V4L2_DV_BT_CEA_720X576I50,
38 V4L2_DV_BT_CEA_720X576P50,
39 V4L2_DV_BT_CEA_1280X720P24,
40 V4L2_DV_BT_CEA_1280X720P25,
41 V4L2_DV_BT_CEA_1280X720P30,
42 V4L2_DV_BT_CEA_1280X720P50,
43 V4L2_DV_BT_CEA_1280X720P60,
44 V4L2_DV_BT_CEA_1920X1080P24,
45 V4L2_DV_BT_CEA_1920X1080P25,
46 V4L2_DV_BT_CEA_1920X1080P30,
47 V4L2_DV_BT_CEA_1920X1080I50,
48 V4L2_DV_BT_CEA_1920X1080P50,
49 V4L2_DV_BT_CEA_1920X1080I60,
50 V4L2_DV_BT_CEA_1920X1080P60,
51 V4L2_DV_BT_DMT_640X350P85,
52 V4L2_DV_BT_DMT_640X400P85,
53 V4L2_DV_BT_DMT_720X400P85,
54 V4L2_DV_BT_DMT_640X480P72,
55 V4L2_DV_BT_DMT_640X480P75,
56 V4L2_DV_BT_DMT_640X480P85,
57 V4L2_DV_BT_DMT_800X600P56,
58 V4L2_DV_BT_DMT_800X600P60,
59 V4L2_DV_BT_DMT_800X600P72,
60 V4L2_DV_BT_DMT_800X600P75,
61 V4L2_DV_BT_DMT_800X600P85,
62 V4L2_DV_BT_DMT_800X600P120_RB,
63 V4L2_DV_BT_DMT_848X480P60,
64 V4L2_DV_BT_DMT_1024X768I43,
65 V4L2_DV_BT_DMT_1024X768P60,
66 V4L2_DV_BT_DMT_1024X768P70,
67 V4L2_DV_BT_DMT_1024X768P75,
68 V4L2_DV_BT_DMT_1024X768P85,
69 V4L2_DV_BT_DMT_1024X768P120_RB,
70 V4L2_DV_BT_DMT_1152X864P75,
71 V4L2_DV_BT_DMT_1280X768P60_RB,
72 V4L2_DV_BT_DMT_1280X768P60,
73 V4L2_DV_BT_DMT_1280X768P75,
74 V4L2_DV_BT_DMT_1280X768P85,
75 V4L2_DV_BT_DMT_1280X768P120_RB,
76 V4L2_DV_BT_DMT_1280X800P60_RB,
77 V4L2_DV_BT_DMT_1280X800P60,
78 V4L2_DV_BT_DMT_1280X800P75,
79 V4L2_DV_BT_DMT_1280X800P85,
80 V4L2_DV_BT_DMT_1280X800P120_RB,
81 V4L2_DV_BT_DMT_1280X960P60,
82 V4L2_DV_BT_DMT_1280X960P85,
83 V4L2_DV_BT_DMT_1280X960P120_RB,
84 V4L2_DV_BT_DMT_1280X1024P60,
85 V4L2_DV_BT_DMT_1280X1024P75,
86 V4L2_DV_BT_DMT_1280X1024P85,
87 V4L2_DV_BT_DMT_1280X1024P120_RB,
88 V4L2_DV_BT_DMT_1360X768P60,
89 V4L2_DV_BT_DMT_1360X768P120_RB,
90 V4L2_DV_BT_DMT_1366X768P60,
91 V4L2_DV_BT_DMT_1366X768P60_RB,
92 V4L2_DV_BT_DMT_1400X1050P60_RB,
93 V4L2_DV_BT_DMT_1400X1050P60,
94 V4L2_DV_BT_DMT_1400X1050P75,
95 V4L2_DV_BT_DMT_1400X1050P85,
96 V4L2_DV_BT_DMT_1400X1050P120_RB,
97 V4L2_DV_BT_DMT_1440X900P60_RB,
98 V4L2_DV_BT_DMT_1440X900P60,
99 V4L2_DV_BT_DMT_1440X900P75,
100 V4L2_DV_BT_DMT_1440X900P85,
101 V4L2_DV_BT_DMT_1440X900P120_RB,
102 V4L2_DV_BT_DMT_1600X900P60_RB,
103 V4L2_DV_BT_DMT_1600X1200P60,
104 V4L2_DV_BT_DMT_1600X1200P65,
105 V4L2_DV_BT_DMT_1600X1200P70,
106 V4L2_DV_BT_DMT_1600X1200P75,
107 V4L2_DV_BT_DMT_1600X1200P85,
108 V4L2_DV_BT_DMT_1600X1200P120_RB,
109 V4L2_DV_BT_DMT_1680X1050P60_RB,
110 V4L2_DV_BT_DMT_1680X1050P60,
111 V4L2_DV_BT_DMT_1680X1050P75,
112 V4L2_DV_BT_DMT_1680X1050P85,
113 V4L2_DV_BT_DMT_1680X1050P120_RB,
114 V4L2_DV_BT_DMT_1792X1344P60,
115 V4L2_DV_BT_DMT_1792X1344P75,
116 V4L2_DV_BT_DMT_1792X1344P120_RB,
117 V4L2_DV_BT_DMT_1856X1392P60,
118 V4L2_DV_BT_DMT_1856X1392P75,
119 V4L2_DV_BT_DMT_1856X1392P120_RB,
120 V4L2_DV_BT_DMT_1920X1200P60_RB,
121 V4L2_DV_BT_DMT_1920X1200P60,
122 V4L2_DV_BT_DMT_1920X1200P75,
123 V4L2_DV_BT_DMT_1920X1200P85,
124 V4L2_DV_BT_DMT_1920X1200P120_RB,
125 V4L2_DV_BT_DMT_1920X1440P60,
126 V4L2_DV_BT_DMT_1920X1440P75,
127 V4L2_DV_BT_DMT_1920X1440P120_RB,
128 V4L2_DV_BT_DMT_2048X1152P60_RB,
129 V4L2_DV_BT_DMT_2560X1600P60_RB,
130 V4L2_DV_BT_DMT_2560X1600P60,
131 V4L2_DV_BT_DMT_2560X1600P75,
132 V4L2_DV_BT_DMT_2560X1600P85,
133 V4L2_DV_BT_DMT_2560X1600P120_RB,
134 V4L2_DV_BT_CEA_3840X2160P24,
135 V4L2_DV_BT_CEA_3840X2160P25,
136 V4L2_DV_BT_CEA_3840X2160P30,
137 V4L2_DV_BT_CEA_3840X2160P50,
138 V4L2_DV_BT_CEA_3840X2160P60,
139 V4L2_DV_BT_CEA_4096X2160P24,
140 V4L2_DV_BT_CEA_4096X2160P25,
141 V4L2_DV_BT_CEA_4096X2160P30,
142 V4L2_DV_BT_CEA_4096X2160P50,
143 V4L2_DV_BT_DMT_4096X2160P59_94_RB,
144 V4L2_DV_BT_CEA_4096X2160P60,
145 { }
146};
147EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
148
149bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
150 const struct v4l2_dv_timings_cap *dvcap,
151 v4l2_check_dv_timings_fnc fnc,
152 void *fnc_handle)
153{
154 const struct v4l2_bt_timings *bt = &t->bt;
155 const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
156 u32 caps = cap->capabilities;
157
158 if (t->type != V4L2_DV_BT_656_1120)
159 return false;
160 if (t->type != dvcap->type ||
161 bt->height < cap->min_height ||
162 bt->height > cap->max_height ||
163 bt->width < cap->min_width ||
164 bt->width > cap->max_width ||
165 bt->pixelclock < cap->min_pixelclock ||
166 bt->pixelclock > cap->max_pixelclock ||
167 (cap->standards && bt->standards &&
168 !(bt->standards & cap->standards)) ||
169 (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
170 (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
171 return false;
172 return fnc == NULL || fnc(t, fnc_handle);
173}
174EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
175
176int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
177 const struct v4l2_dv_timings_cap *cap,
178 v4l2_check_dv_timings_fnc fnc,
179 void *fnc_handle)
180{
181 u32 i, idx;
182
183 memset(t->reserved, 0, sizeof(t->reserved));
184 for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
185 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
186 fnc, fnc_handle) &&
187 idx++ == t->index) {
188 t->timings = v4l2_dv_timings_presets[i];
189 return 0;
190 }
191 }
192 return -EINVAL;
193}
194EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
195
196bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
197 const struct v4l2_dv_timings_cap *cap,
198 unsigned pclock_delta,
199 v4l2_check_dv_timings_fnc fnc,
200 void *fnc_handle)
201{
202 int i;
203
204 if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
205 return false;
206
207 for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) {
208 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
209 fnc, fnc_handle) &&
210 v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
211 pclock_delta)) {
212 *t = v4l2_dv_timings_presets[i];
213 return true;
214 }
215 }
216 return false;
217}
218EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
219
220
221
222
223
224
225
226
227
228bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
229 const struct v4l2_dv_timings *t2,
230 unsigned pclock_delta)
231{
232 if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
233 return false;
234 if (t1->bt.width == t2->bt.width &&
235 t1->bt.height == t2->bt.height &&
236 t1->bt.interlaced == t2->bt.interlaced &&
237 t1->bt.polarities == t2->bt.polarities &&
238 t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
239 t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
240 t1->bt.hfrontporch == t2->bt.hfrontporch &&
241 t1->bt.vfrontporch == t2->bt.vfrontporch &&
242 t1->bt.vsync == t2->bt.vsync &&
243 t1->bt.vbackporch == t2->bt.vbackporch &&
244 (!t1->bt.interlaced ||
245 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
246 t1->bt.il_vsync == t2->bt.il_vsync &&
247 t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
248 return true;
249 return false;
250}
251EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
252
253void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
254 const struct v4l2_dv_timings *t, bool detailed)
255{
256 const struct v4l2_bt_timings *bt = &t->bt;
257 u32 htot, vtot;
258
259 if (t->type != V4L2_DV_BT_656_1120)
260 return;
261
262 htot = V4L2_DV_BT_FRAME_WIDTH(bt);
263 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
264
265 if (prefix == NULL)
266 prefix = "";
267
268 pr_info("%s: %s%ux%u%s%u (%ux%u)\n", dev_prefix, prefix,
269 bt->width, bt->height, bt->interlaced ? "i" : "p",
270 (htot * vtot) > 0 ? ((u32)bt->pixelclock / (htot * vtot)) : 0,
271 htot, vtot);
272
273 if (!detailed)
274 return;
275
276 pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
277 dev_prefix, bt->hfrontporch,
278 (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
279 bt->hsync, bt->hbackporch);
280 pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
281 dev_prefix, bt->vfrontporch,
282 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
283 bt->vsync, bt->vbackporch);
284 pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
285 pr_info("%s: flags (0x%x):%s%s%s%s\n", dev_prefix, bt->flags,
286 (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
287 " REDUCED_BLANKING" : "",
288 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
289 " CAN_REDUCE_FPS" : "",
290 (bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
291 " REDUCED_FPS" : "",
292 (bt->flags & V4L2_DV_FL_HALF_LINE) ?
293 " HALF_LINE" : "");
294 pr_info("%s: standards (0x%x):%s%s%s%s\n", dev_prefix, bt->standards,
295 (bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "",
296 (bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "",
297 (bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "",
298 (bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "");
299}
300EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
301
302
303
304
305
306
307
308#define CVT_PXL_CLK_GRAN 250000
309
310
311#define CVT_MIN_V_BPORCH 7
312#define CVT_MIN_V_PORCH_RND 3
313#define CVT_MIN_VSYNC_BP 550
314
315
316#define CVT_CELL_GRAN 8
317#define CVT_M 600
318#define CVT_C 40
319#define CVT_K 128
320#define CVT_J 20
321#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
322#define CVT_M_PRIME (CVT_K * CVT_M / 256)
323
324
325#define CVT_RB_MIN_V_BPORCH 7
326#define CVT_RB_V_FPORCH 3
327#define CVT_RB_MIN_V_BLANK 460
328#define CVT_RB_H_SYNC 32
329#define CVT_RB_H_BPORCH 80
330#define CVT_RB_H_BLANK 160
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
349 u32 polarities, struct v4l2_dv_timings *fmt)
350{
351 int v_fp, v_bp, h_fp, h_bp, hsync;
352 int frame_width, image_height, image_width;
353 bool reduced_blanking;
354 unsigned pix_clk;
355
356 if (vsync < 4 || vsync > 7)
357 return false;
358
359 if (polarities == V4L2_DV_VSYNC_POS_POL)
360 reduced_blanking = false;
361 else if (polarities == V4L2_DV_HSYNC_POS_POL)
362 reduced_blanking = true;
363 else
364 return false;
365
366
367 if (reduced_blanking) {
368 v_fp = CVT_RB_V_FPORCH;
369 v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 1999999) / 1000000;
370 v_bp -= vsync + v_fp;
371
372 if (v_bp < CVT_RB_MIN_V_BPORCH)
373 v_bp = CVT_RB_MIN_V_BPORCH;
374 } else {
375 v_fp = CVT_MIN_V_PORCH_RND;
376 v_bp = (CVT_MIN_VSYNC_BP * hfreq + 1999999) / 1000000 - vsync;
377
378 if (v_bp < CVT_MIN_V_BPORCH)
379 v_bp = CVT_MIN_V_BPORCH;
380 }
381 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
382
383
384 switch (vsync) {
385 case 4:
386 image_width = (image_height * 4) / 3;
387 break;
388 case 5:
389 image_width = (image_height * 16) / 9;
390 break;
391 case 6:
392 image_width = (image_height * 16) / 10;
393 break;
394 case 7:
395
396 if (image_height == 1024)
397 image_width = (image_height * 5) / 4;
398 else if (image_height == 768)
399 image_width = (image_height * 15) / 9;
400 else
401 return false;
402 break;
403 default:
404 return false;
405 }
406
407 image_width = image_width & ~7;
408
409
410 if (reduced_blanking) {
411 pix_clk = (image_width + CVT_RB_H_BLANK) * hfreq;
412 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
413
414 h_bp = CVT_RB_H_BPORCH;
415 hsync = CVT_RB_H_SYNC;
416 h_fp = CVT_RB_H_BLANK - h_bp - hsync;
417
418 frame_width = image_width + CVT_RB_H_BLANK;
419 } else {
420 unsigned ideal_duty_cycle_per_myriad =
421 100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
422 int h_blank;
423
424 if (ideal_duty_cycle_per_myriad < 2000)
425 ideal_duty_cycle_per_myriad = 2000;
426
427 h_blank = image_width * ideal_duty_cycle_per_myriad /
428 (10000 - ideal_duty_cycle_per_myriad);
429 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
430
431 pix_clk = (image_width + h_blank) * hfreq;
432 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
433
434 h_bp = h_blank / 2;
435 frame_width = image_width + h_blank;
436
437 hsync = (frame_width * 8 + 50) / 100;
438 hsync = hsync - hsync % CVT_CELL_GRAN;
439 h_fp = h_blank - hsync - h_bp;
440 }
441
442 fmt->type = V4L2_DV_BT_656_1120;
443 fmt->bt.polarities = polarities;
444 fmt->bt.width = image_width;
445 fmt->bt.height = image_height;
446 fmt->bt.hfrontporch = h_fp;
447 fmt->bt.vfrontporch = v_fp;
448 fmt->bt.hsync = hsync;
449 fmt->bt.vsync = vsync;
450 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
451 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
452 fmt->bt.pixelclock = pix_clk;
453 fmt->bt.standards = V4L2_DV_BT_STD_CVT;
454 if (reduced_blanking)
455 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
456 return true;
457}
458EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
459
460
461
462
463
464
465
466#define GTF_PXL_CLK_GRAN 250000
467
468#define GTF_MIN_VSYNC_BP 550
469#define GTF_V_FP 1
470#define GTF_CELL_GRAN 8
471
472
473#define GTF_D_M 600
474#define GTF_D_C 40
475#define GTF_D_K 128
476#define GTF_D_J 20
477#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
478#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
479
480
481#define GTF_S_M 3600
482#define GTF_S_C 40
483#define GTF_S_K 128
484#define GTF_S_J 35
485#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
486#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505bool v4l2_detect_gtf(unsigned frame_height,
506 unsigned hfreq,
507 unsigned vsync,
508 u32 polarities,
509 struct v4l2_fract aspect,
510 struct v4l2_dv_timings *fmt)
511{
512 int pix_clk;
513 int v_fp, v_bp, h_fp, hsync;
514 int frame_width, image_height, image_width;
515 bool default_gtf;
516 int h_blank;
517
518 if (vsync != 3)
519 return false;
520
521 if (polarities == V4L2_DV_VSYNC_POS_POL)
522 default_gtf = true;
523 else if (polarities == V4L2_DV_HSYNC_POS_POL)
524 default_gtf = false;
525 else
526 return false;
527
528
529 v_fp = GTF_V_FP;
530 v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync;
531 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
532
533 if (aspect.numerator == 0 || aspect.denominator == 0) {
534 aspect.numerator = 16;
535 aspect.denominator = 9;
536 }
537 image_width = ((image_height * aspect.numerator) / aspect.denominator);
538 image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
539
540
541 if (default_gtf)
542 h_blank = ((image_width * GTF_D_C_PRIME * hfreq) -
543 (image_width * GTF_D_M_PRIME * 1000) +
544 (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) /
545 (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000);
546 else
547 h_blank = ((image_width * GTF_S_C_PRIME * hfreq) -
548 (image_width * GTF_S_M_PRIME * 1000) +
549 (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) /
550 (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000);
551
552 h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN);
553 frame_width = image_width + h_blank;
554
555 pix_clk = (image_width + h_blank) * hfreq;
556 pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
557
558 hsync = (frame_width * 8 + 50) / 100;
559 hsync = hsync - hsync % GTF_CELL_GRAN;
560
561 h_fp = h_blank / 2 - hsync;
562
563 fmt->type = V4L2_DV_BT_656_1120;
564 fmt->bt.polarities = polarities;
565 fmt->bt.width = image_width;
566 fmt->bt.height = image_height;
567 fmt->bt.hfrontporch = h_fp;
568 fmt->bt.vfrontporch = v_fp;
569 fmt->bt.hsync = hsync;
570 fmt->bt.vsync = vsync;
571 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
572 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
573 fmt->bt.pixelclock = pix_clk;
574 fmt->bt.standards = V4L2_DV_BT_STD_GTF;
575 if (!default_gtf)
576 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
577 return true;
578}
579EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
580
581
582
583
584
585
586
587
588
589
590struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
591{
592 struct v4l2_fract aspect = { 16, 9 };
593 u32 tmp;
594 u8 ratio;
595
596
597 if (!hor_landscape && !vert_portrait)
598 return aspect;
599
600 if (hor_landscape && vert_portrait) {
601 aspect.numerator = hor_landscape;
602 aspect.denominator = vert_portrait;
603 return aspect;
604 }
605
606
607 ratio = hor_landscape | vert_portrait;
608
609 if (ratio == 79) {
610 aspect.numerator = 16;
611 aspect.denominator = 9;
612 } else if (ratio == 34) {
613 aspect.numerator = 4;
614 aspect.denominator = 3;
615 } else if (ratio == 68) {
616 aspect.numerator = 15;
617 aspect.denominator = 9;
618 } else {
619 aspect.numerator = hor_landscape + 99;
620 aspect.denominator = 100;
621 }
622 if (hor_landscape)
623 return aspect;
624
625 tmp = aspect.denominator;
626 aspect.denominator = aspect.numerator;
627 aspect.numerator = tmp;
628 return aspect;
629}
630EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
631
