summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/vimc/vimc-debayer.c
blob: 35b15bd4d61db32d5263aa21e23c6c863ef01c7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
/*
 * vimc-debayer.c Virtual Media Controller Driver
 *
 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/vmalloc.h>
#include <linux/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>

#include "vimc-common.h"

#define VIMC_DEB_DRV_NAME "vimc-debayer"

static unsigned int deb_mean_win_size = 3;
module_param(deb_mean_win_size, uint, 0000);
MODULE_PARM_DESC(deb_mean_win_size, " the window size to calculate the mean.\n"
	"NOTE: the window size need to be an odd number, as the main pixel "
	"stays in the center of the window, otherwise the next odd number "
	"is considered");

#define IS_SINK(pad) (!pad)
#define IS_SRC(pad)  (pad)

enum vimc_deb_rgb_colors {
	VIMC_DEB_RED = 0,
	VIMC_DEB_GREEN = 1,
	VIMC_DEB_BLUE = 2,
};

struct vimc_deb_pix_map {
	u32 code;
	enum vimc_deb_rgb_colors order[2][2];
};

struct vimc_deb_device {
	struct vimc_ent_device ved;
	struct v4l2_subdev sd;
	struct device *dev;
	/* The active format */
	struct v4l2_mbus_framefmt sink_fmt;
	u32 src_code;
	void (*set_rgb_src)(struct vimc_deb_device *vdeb, unsigned int lin,
			    unsigned int col, unsigned int rgb[3]);
	/* Values calculated when the stream starts */
	u8 *src_frame;
	const struct vimc_deb_pix_map *sink_pix_map;
	unsigned int sink_bpp;
};

static const struct v4l2_mbus_framefmt sink_fmt_default = {
	.width = 640,
	.height = 480,
	.code = MEDIA_BUS_FMT_RGB888_1X24,
	.field = V4L2_FIELD_NONE,
	.colorspace = V4L2_COLORSPACE_DEFAULT,
};

static const struct vimc_deb_pix_map vimc_deb_pix_map_list[] = {
	{
		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }
	},
	{
		.code = MEDIA_BUS_FMT_SGBRG8_1X8,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },
			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SGRBG8_1X8,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },
			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SRGGB8_1X8,
		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }
	},
	{
		.code = MEDIA_BUS_FMT_SBGGR10_1X10,
		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }
	},
	{
		.code = MEDIA_BUS_FMT_SGBRG10_1X10,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },
			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SGRBG10_1X10,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },
			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SRGGB10_1X10,
		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }
	},
	{
		.code = MEDIA_BUS_FMT_SBGGR12_1X12,
		.order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_RED } }
	},
	{
		.code = MEDIA_BUS_FMT_SGBRG12_1X12,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE },
			   { VIMC_DEB_RED, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SGRBG12_1X12,
		.order = { { VIMC_DEB_GREEN, VIMC_DEB_RED },
			   { VIMC_DEB_BLUE, VIMC_DEB_GREEN } }
	},
	{
		.code = MEDIA_BUS_FMT_SRGGB12_1X12,
		.order = { { VIMC_DEB_RED, VIMC_DEB_GREEN },
			   { VIMC_DEB_GREEN, VIMC_DEB_BLUE } }
	},
};

static const struct vimc_deb_pix_map *vimc_deb_pix_map_by_code(u32 code)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(vimc_deb_pix_map_list); i++)
		if (vimc_deb_pix_map_list[i].code == code)
			return &vimc_deb_pix_map_list[i];

	return NULL;
}

static int vimc_deb_init_cfg(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg)
{
	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *mf;
	unsigned int i;

	mf = v4l2_subdev_get_try_format(sd, cfg, 0);
	*mf = sink_fmt_default;

	for (i = 1; i < sd->entity.num_pads; i++) {
		mf = v4l2_subdev_get_try_format(sd, cfg, i);
		*mf = sink_fmt_default;
		mf->code = vdeb->src_code;
	}

	return 0;
}

static int vimc_deb_enum_mbus_code(struct v4l2_subdev *sd,
				   struct v4l2_subdev_pad_config *cfg,
				   struct v4l2_subdev_mbus_code_enum *code)
{
	/* We only support one format for source pads */
	if (IS_SRC(code->pad)) {
		struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

		if (code->index)
			return -EINVAL;

		code->code = vdeb->src_code;
	} else {
		if (code->index >= ARRAY_SIZE(vimc_deb_pix_map_list))
			return -EINVAL;

		code->code = vimc_deb_pix_map_list[code->index].code;
	}

	return 0;
}

static int vimc_deb_enum_frame_size(struct v4l2_subdev *sd,
				    struct v4l2_subdev_pad_config *cfg,
				    struct v4l2_subdev_frame_size_enum *fse)
{
	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	if (fse->index)
		return -EINVAL;

	if (IS_SINK(fse->pad)) {
		const struct vimc_deb_pix_map *vpix =
			vimc_deb_pix_map_by_code(fse->code);

		if (!vpix)
			return -EINVAL;
	} else if (fse->code != vdeb->src_code) {
		return -EINVAL;
	}

	fse->min_width = VIMC_FRAME_MIN_WIDTH;
	fse->max_width = VIMC_FRAME_MAX_WIDTH;
	fse->min_height = VIMC_FRAME_MIN_HEIGHT;
	fse->max_height = VIMC_FRAME_MAX_HEIGHT;

	return 0;
}

static int vimc_deb_get_fmt(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *fmt)
{
	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);

	/* Get the current sink format */
	fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ?
		      *v4l2_subdev_get_try_format(sd, cfg, 0) :
		      vdeb->sink_fmt;

	/* Set the right code for the source pad */
	if (IS_SRC(fmt->pad))
		fmt->format.code = vdeb->src_code;

	return 0;
}

static void vimc_deb_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
{
	const struct vimc_deb_pix_map *vpix;

	/* Don't accept a code that is not on the debayer table */
	vpix = vimc_deb_pix_map_by_code(fmt->code);
	if (!vpix)
		fmt->code = sink_fmt_default.code;

	fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
			     VIMC_FRAME_MAX_WIDTH) & ~1;
	fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
			      VIMC_FRAME_MAX_HEIGHT) & ~1;

	if (fmt->field == V4L2_FIELD_ANY)
		fmt->field = sink_fmt_default.field;

	vimc_colorimetry_clamp(fmt);
}

static int vimc_deb_set_fmt(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *fmt)
{
	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *sink_fmt;

	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
		/* Do not change the format while stream is on */
		if (vdeb->src_frame)
			return -EBUSY;

		sink_fmt = &vdeb->sink_fmt;
	} else {
		sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
	}

	/*
	 * Do not change the format of the source pad,
	 * it is propagated from the sink
	 */
	if (IS_SRC(fmt->pad)) {
		fmt->format = *sink_fmt;
		/* TODO: Add support for other formats */
		fmt->format.code = vdeb->src_code;
	} else {
		/* Set the new format in the sink pad */
		vimc_deb_adjust_sink_fmt(&fmt->format);

		dev_dbg(vdeb->dev, "%s: sink format update: "
			"old:%dx%d (0x%x, %d, %d, %d, %d) "
			"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vdeb->sd.name,
			/* old */
			sink_fmt->width, sink_fmt->height, sink_fmt->code,
			sink_fmt->colorspace, sink_fmt->quantization,
			sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
			/* new */
			fmt->format.width, fmt->format.height, fmt->format.code,
			fmt->format.colorspace,	fmt->format.quantization,
			fmt->format.xfer_func, fmt->format.ycbcr_enc);

		*sink_fmt = fmt->format;
	}

	return 0;
}

static const struct v4l2_subdev_pad_ops vimc_deb_pad_ops = {
	.init_cfg		= vimc_deb_init_cfg,
	.enum_mbus_code		= vimc_deb_enum_mbus_code,
	.enum_frame_size	= vimc_deb_enum_frame_size,
	.get_fmt		= vimc_deb_get_fmt,
	.set_fmt		= vimc_deb_set_fmt,
};

static void vimc_deb_set_rgb_mbus_fmt_rgb888_1x24(struct vimc_deb_device *vdeb,
						  unsigned int lin,
						  unsigned int col,
						  unsigned int rgb[3])
{
	unsigned int i, index;

	index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);
	for (i = 0; i < 3; i++)
		vdeb->src_frame[index + i] = rgb[i];
}

static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd);
	int ret;

	if (enable) {
		const struct vimc_pix_map *vpix;
		unsigned int frame_size;

		if (vdeb->src_frame)
			return 0;

		/* Calculate the frame size of the source pad */
		vpix = vimc_pix_map_by_code(vdeb->src_code);
		frame_size = vdeb->sink_fmt.width * vdeb->sink_fmt.height *
				vpix->bpp;

		/* Save the bytes per pixel of the sink */
		vpix = vimc_pix_map_by_code(vdeb->sink_fmt.code);
		vdeb->sink_bpp = vpix->bpp;

		/* Get the corresponding pixel map from the table */
		vdeb->sink_pix_map =
			vimc_deb_pix_map_by_code(vdeb->sink_fmt.code);

		/*
		 * Allocate the frame buffer. Use vmalloc to be able to
		 * allocate a large amount of memory
		 */
		vdeb->src_frame = vmalloc(frame_size);
		if (!vdeb->src_frame)
			return -ENOMEM;

		/* Turn the stream on in the subdevices directly connected */
		ret = vimc_pipeline_s_stream(&vdeb->sd.entity, 1);
		if (ret) {
			vfree(vdeb->src_frame);
			vdeb->src_frame = NULL;
			return ret;
		}
	} else {
		if (!vdeb->src_frame)
			return 0;

		/* Disable streaming from the pipe */
		ret = vimc_pipeline_s_stream(&vdeb->sd.entity, 0);
		if (ret)
			return ret;

		vfree(vdeb->src_frame);
		vdeb->src_frame = NULL;
	}

	return 0;
}

static struct v4l2_subdev_video_ops vimc_deb_video_ops = {
	.s_stream = vimc_deb_s_stream,
};

static const struct v4l2_subdev_ops vimc_deb_ops = {
	.pad = &vimc_deb_pad_ops,
	.video = &vimc_deb_video_ops,
};

static unsigned int vimc_deb_get_val(const u8 *bytes,
				     const unsigned int n_bytes)
{
	unsigned int i;
	unsigned int acc = 0;

	for (i = 0; i < n_bytes; i++)
		acc = acc + (bytes[i] << (8 * i));

	return acc;
}

static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb,
				   const u8 *frame,
				   const unsigned int lin,
				   const unsigned int col,
				   unsigned int rgb[3])
{
	unsigned int i, seek, wlin, wcol;
	unsigned int n_rgb[3] = {0, 0, 0};

	for (i = 0; i < 3; i++)
		rgb[i] = 0;

	/*
	 * Calculate how many we need to subtract to get to the pixel in
	 * the top left corner of the mean window (considering the current
	 * pixel as the center)
	 */
	seek = deb_mean_win_size / 2;

	/* Sum the values of the colors in the mean window */

	dev_dbg(vdeb->dev,
		"deb: %s: --- Calc pixel %dx%d, window mean %d, seek %d ---\n",
		vdeb->sd.name, lin, col, vdeb->sink_fmt.height, seek);

	/*
	 * Iterate through all the lines in the mean window, start
	 * with zero if the pixel is outside the frame and don't pass
	 * the height when the pixel is in the bottom border of the
	 * frame
	 */
	for (wlin = seek > lin ? 0 : lin - seek;
	     wlin < lin + seek + 1 && wlin < vdeb->sink_fmt.height;
	     wlin++) {

		/*
		 * Iterate through all the columns in the mean window, start
		 * with zero if the pixel is outside the frame and don't pass
		 * the width when the pixel is in the right border of the
		 * frame
		 */
		for (wcol = seek > col ? 0 : col - seek;
		     wcol < col + seek + 1 && wcol < vdeb->sink_fmt.width;
		     wcol++) {
			enum vimc_deb_rgb_colors color;
			unsigned int index;

			/* Check which color this pixel is */
			color = vdeb->sink_pix_map->order[wlin % 2][wcol % 2];

			index = VIMC_FRAME_INDEX(wlin, wcol,
						 vdeb->sink_fmt.width,
						 vdeb->sink_bpp);

			dev_dbg(vdeb->dev,
				"deb: %s: RGB CALC: frame index %d, win pos %dx%d, color %d\n",
				vdeb->sd.name, index, wlin, wcol, color);

			/* Get its value */
			rgb[color] = rgb[color] +
				vimc_deb_get_val(&frame[index], vdeb->sink_bpp);

			/* Save how many values we already added */
			n_rgb[color]++;

			dev_dbg(vdeb->dev, "deb: %s: RGB CALC: val %d, n %d\n",
				vdeb->sd.name, rgb[color], n_rgb[color]);
		}
	}

	/* Calculate the mean */
	for (i = 0; i < 3; i++) {
		dev_dbg(vdeb->dev,
			"deb: %s: PRE CALC: %dx%d Color %d, val %d, n %d\n",
			vdeb->sd.name, lin, col, i, rgb[i], n_rgb[i]);

		if (n_rgb[i])
			rgb[i] = rgb[i] / n_rgb[i];

		dev_dbg(vdeb->dev,
			"deb: %s: FINAL CALC: %dx%d Color %d, val %d\n",
			vdeb->sd.name, lin, col, i, rgb[i]);
	}
}

static void vimc_deb_process_frame(struct vimc_ent_device *ved,
				   struct media_pad *sink,
				   const void *sink_frame)
{
	struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
						    ved);
	unsigned int rgb[3];
	unsigned int i, j;

	/* If the stream in this node is not active, just return */
	if (!vdeb->src_frame)
		return;

	for (i = 0; i < vdeb->sink_fmt.height; i++)
		for (j = 0; j < vdeb->sink_fmt.width; j++) {
			vimc_deb_calc_rgb_sink(vdeb, sink_frame, i, j, rgb);
			vdeb->set_rgb_src(vdeb, i, j, rgb);
		}

	/* Propagate the frame through all source pads */
	for (i = 1; i < vdeb->sd.entity.num_pads; i++) {
		struct media_pad *pad = &vdeb->sd.entity.pads[i];

		vimc_propagate_frame(pad, vdeb->src_frame);
	}
}

static void vimc_deb_comp_unbind(struct device *comp, struct device *master,
				 void *master_data)
{
	struct vimc_ent_device *ved = dev_get_drvdata(comp);
	struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
						    ved);

	vimc_ent_sd_unregister(ved, &vdeb->sd);
	kfree(vdeb);
}

static int vimc_deb_comp_bind(struct device *comp, struct device *master,
			      void *master_data)
{
	struct v4l2_device *v4l2_dev = master_data;
	struct vimc_platform_data *pdata = comp->platform_data;
	struct vimc_deb_device *vdeb;
	int ret;

	/* Allocate the vdeb struct */
	vdeb = kzalloc(sizeof(*vdeb), GFP_KERNEL);
	if (!vdeb)
		return -ENOMEM;

	/* Initialize ved and sd */
	ret = vimc_ent_sd_register(&vdeb->ved, &vdeb->sd, v4l2_dev,
				   pdata->entity_name,
				   MEDIA_ENT_F_ATV_DECODER, 2,
				   (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
				   MEDIA_PAD_FL_SOURCE},
				   &vimc_deb_ops);
	if (ret) {
		kfree(vdeb);
		return ret;
	}

	vdeb->ved.process_frame = vimc_deb_process_frame;
	dev_set_drvdata(comp, &vdeb->ved);
	vdeb->dev = comp;

	/* Initialize the frame format */
	vdeb->sink_fmt = sink_fmt_default;
	/*
	 * TODO: Add support for more output formats, we only support
	 * RGB888 for now
	 * NOTE: the src format is always the same as the sink, except
	 * for the code
	 */
	vdeb->src_code = MEDIA_BUS_FMT_RGB888_1X24;
	vdeb->set_rgb_src = vimc_deb_set_rgb_mbus_fmt_rgb888_1x24;

	return 0;
}

static const struct component_ops vimc_deb_comp_ops = {
	.bind = vimc_deb_comp_bind,
	.unbind = vimc_deb_comp_unbind,
};

static int vimc_deb_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &vimc_deb_comp_ops);
}

static int vimc_deb_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &vimc_deb_comp_ops);

	return 0;
}

static struct platform_driver vimc_deb_pdrv = {
	.probe		= vimc_deb_probe,
	.remove		= vimc_deb_remove,
	.driver		= {
		.name	= VIMC_DEB_DRV_NAME,
	},
};

static const struct platform_device_id vimc_deb_driver_ids[] = {
	{
		.name           = VIMC_DEB_DRV_NAME,
	},
	{ }
};

module_platform_driver(vimc_deb_pdrv);

MODULE_DEVICE_TABLE(platform, vimc_deb_driver_ids);

MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Debayer");
MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
MODULE_LICENSE("GPL");