aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/vimc/vimc-scaler.c
blob: c7123a45c55bcfaf654cb77d91592037f8cc121b (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * vimc-scaler.c Virtual Media Controller Driver
 *
 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
 */

#include <linux/component.h>
#include <linux/module.h>
#include <linux/mod_devicetable.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_SCA_DRV_NAME "vimc-scaler"

static unsigned int sca_mult = 3;
module_param(sca_mult, uint, 0000);
MODULE_PARM_DESC(sca_mult, " the image size multiplier");

#define IS_SINK(pad)	(!pad)
#define IS_SRC(pad)	(pad)
#define MAX_ZOOM	8

static const u32 vimc_sca_supported_pixfmt[] = {
	V4L2_PIX_FMT_BGR24,
	V4L2_PIX_FMT_RGB24,
	V4L2_PIX_FMT_ARGB32,
};

struct vimc_sca_device {
	struct vimc_ent_device ved;
	struct v4l2_subdev sd;
	struct device *dev;
	/* NOTE: the source fmt is the same as the sink
	 * with the width and hight multiplied by mult
	 */
	struct v4l2_mbus_framefmt sink_fmt;
	/* Values calculated when the stream starts */
	u8 *src_frame;
	unsigned int src_line_size;
	unsigned int 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 bool vimc_sca_is_pixfmt_supported(u32 pixelformat)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(vimc_sca_supported_pixfmt); i++)
		if (vimc_sca_supported_pixfmt[i] == pixelformat)
			return true;
	return false;
}

static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg)
{
	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->width = mf->width * sca_mult;
		mf->height = mf->height * sca_mult;
	}

	return 0;
}

static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
				    struct v4l2_subdev_pad_config *cfg,
				    struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->index)
		return -EINVAL;

	fse->min_width = VIMC_FRAME_MIN_WIDTH;
	fse->min_height = VIMC_FRAME_MIN_HEIGHT;

	if (IS_SINK(fse->pad)) {
		fse->max_width = VIMC_FRAME_MAX_WIDTH;
		fse->max_height = VIMC_FRAME_MAX_HEIGHT;
	} else {
		fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
		fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
	}

	return 0;
}

static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *format)
{
	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);

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

	/* Scale the frame size for the source pad */
	if (IS_SRC(format->pad)) {
		format->format.width = vsca->sink_fmt.width * sca_mult;
		format->format.height = vsca->sink_fmt.height * sca_mult;
	}

	return 0;
}

static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
{
	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_sca_set_fmt(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *fmt)
{
	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *sink_fmt;

	if (!vimc_mbus_code_supported(fmt->format.code))
		fmt->format.code = sink_fmt_default.code;

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

		sink_fmt = &vsca->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;
		fmt->format.width = sink_fmt->width * sca_mult;
		fmt->format.height = sink_fmt->height * sca_mult;
	} else {
		/* Set the new format in the sink pad */
		vimc_sca_adjust_sink_fmt(&fmt->format);

		dev_dbg(vsca->dev, "%s: sink format update: "
			"old:%dx%d (0x%x, %d, %d, %d, %d) "
			"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->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_sca_pad_ops = {
	.init_cfg		= vimc_sca_init_cfg,
	.enum_mbus_code		= vimc_enum_mbus_code,
	.enum_frame_size	= vimc_sca_enum_frame_size,
	.get_fmt		= vimc_sca_get_fmt,
	.set_fmt		= vimc_sca_set_fmt,
};

static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);

	if (enable) {
		u32 pixelformat = vsca->ved.stream->producer_pixfmt;
		const struct v4l2_format_info *pix_info;
		unsigned int frame_size;

		if (!vimc_sca_is_pixfmt_supported(pixelformat)) {
			dev_err(vsca->dev, "pixfmt (0x%08x) is not supported\n",
				pixelformat);
			return -EINVAL;
		}

		/* Save the bytes per pixel of the sink */
		pix_info = v4l2_format_info(pixelformat);
		vsca->bpp = pix_info->bpp[0];

		/* Calculate the width in bytes of the src frame */
		vsca->src_line_size = vsca->sink_fmt.width *
				      sca_mult * vsca->bpp;

		/* Calculate the frame size of the source pad */
		frame_size = vsca->src_line_size * vsca->sink_fmt.height *
			     sca_mult;

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

	} else {
		if (!vsca->src_frame)
			return 0;

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

	return 0;
}

static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
	.s_stream = vimc_sca_s_stream,
};

static const struct v4l2_subdev_ops vimc_sca_ops = {
	.pad = &vimc_sca_pad_ops,
	.video = &vimc_sca_video_ops,
};

static void vimc_sca_fill_pix(u8 *const ptr,
			      const u8 *const pixel,
			      const unsigned int bpp)
{
	unsigned int i;

	/* copy the pixel to the pointer */
	for (i = 0; i < bpp; i++)
		ptr[i] = pixel[i];
}

static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
			       const unsigned int lin, const unsigned int col,
			       const u8 *const sink_frame)
{
	unsigned int i, j, index;
	const u8 *pixel;

	/* Point to the pixel value in position (lin, col) in the sink frame */
	index = VIMC_FRAME_INDEX(lin, col,
				 vsca->sink_fmt.width,
				 vsca->bpp);
	pixel = &sink_frame[index];

	dev_dbg(vsca->dev,
		"sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
		vsca->sd.name, lin, col, index);

	/* point to the place we are going to put the first pixel
	 * in the scaled src frame
	 */
	index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
				 vsca->sink_fmt.width * sca_mult, vsca->bpp);

	dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
		vsca->sd.name, lin * sca_mult, col * sca_mult, index);

	/* Repeat this pixel mult times */
	for (i = 0; i < sca_mult; i++) {
		/* Iterate through each beginning of a
		 * pixel repetition in a line
		 */
		for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
			dev_dbg(vsca->dev,
				"sca: %s: sca: scale_pix src pos %d\n",
				vsca->sd.name, index + j);

			/* copy the pixel to the position index + j */
			vimc_sca_fill_pix(&vsca->src_frame[index + j],
					  pixel, vsca->bpp);
		}

		/* move the index to the next line */
		index += vsca->src_line_size;
	}
}

static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
				    const u8 *const sink_frame)
{
	unsigned int i, j;

	/* Scale each pixel from the original sink frame */
	/* TODO: implement scale down, only scale up is supported for now */
	for (i = 0; i < vsca->sink_fmt.height; i++)
		for (j = 0; j < vsca->sink_fmt.width; j++)
			vimc_sca_scale_pix(vsca, i, j, sink_frame);
}

static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
				    const void *sink_frame)
{
	struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
						    ved);

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

	vimc_sca_fill_src_frame(vsca, sink_frame);

	return vsca->src_frame;
};

static void vimc_sca_release(struct v4l2_subdev *sd)
{
	struct vimc_sca_device *vsca =
				container_of(sd, struct vimc_sca_device, sd);

	kfree(vsca);
}

static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
	.release = vimc_sca_release,
};

static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
				 void *master_data)
{
	struct vimc_ent_device *ved = dev_get_drvdata(comp);
	struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
						    ved);

	vimc_ent_sd_unregister(ved, &vsca->sd);
}


static int vimc_sca_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_sca_device *vsca;
	int ret;

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

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

	vsca->ved.process_frame = vimc_sca_process_frame;
	dev_set_drvdata(comp, &vsca->ved);
	vsca->dev = comp;

	/* Initialize the frame format */
	vsca->sink_fmt = sink_fmt_default;

	return 0;
}

static const struct component_ops vimc_sca_comp_ops = {
	.bind = vimc_sca_comp_bind,
	.unbind = vimc_sca_comp_unbind,
};

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

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

	return 0;
}

static const struct platform_device_id vimc_sca_driver_ids[] = {
	{
		.name           = VIMC_SCA_DRV_NAME,
	},
	{ }
};

static struct platform_driver vimc_sca_pdrv = {
	.probe		= vimc_sca_probe,
	.remove		= vimc_sca_remove,
	.id_table	= vimc_sca_driver_ids,
	.driver		= {
		.name	= VIMC_SCA_DRV_NAME,
	},
};

module_platform_driver(vimc_sca_pdrv);

MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);

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

Privacy Policy