summaryrefslogtreecommitdiff
path: root/drivers/media/platform/video-mux.c
blob: c01e1592ad0a8f7d52614bb81d4bc768b5459f2e (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
/*
 * video stream multiplexer controlled via mux control
 *
 * Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
 * Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
 *
 * 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/err.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>

struct video_mux {
	struct v4l2_subdev subdev;
	struct media_pad *pads;
	struct v4l2_mbus_framefmt *format_mbus;
	struct mux_control *mux;
	struct mutex lock;
	int active;
};

static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
	.width = 1,
	.height = 1,
	.code = MEDIA_BUS_FMT_Y8_1X8,
	.field = V4L2_FIELD_NONE,
};

static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
{
	return container_of(sd, struct video_mux, subdev);
}

static int video_mux_link_setup(struct media_entity *entity,
				const struct media_pad *local,
				const struct media_pad *remote, u32 flags)
{
	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
	u16 source_pad = entity->num_pads - 1;
	int ret = 0;

	/*
	 * The mux state is determined by the enabled sink pad link.
	 * Enabling or disabling the source pad link has no effect.
	 */
	if (local->flags & MEDIA_PAD_FL_SOURCE)
		return 0;

	dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
		remote->entity->name, remote->index, local->entity->name,
		local->index, flags & MEDIA_LNK_FL_ENABLED);

	mutex_lock(&vmux->lock);

	if (flags & MEDIA_LNK_FL_ENABLED) {
		if (vmux->active == local->index)
			goto out;

		if (vmux->active >= 0) {
			ret = -EBUSY;
			goto out;
		}

		dev_dbg(sd->dev, "setting %d active\n", local->index);
		ret = mux_control_try_select(vmux->mux, local->index);
		if (ret < 0)
			goto out;
		vmux->active = local->index;

		/* Propagate the active format to the source */
		vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
	} else {
		if (vmux->active != local->index)
			goto out;

		dev_dbg(sd->dev, "going inactive\n");
		mux_control_deselect(vmux->mux);
		vmux->active = -1;
	}

out:
	mutex_unlock(&vmux->lock);
	return ret;
}

static const struct media_entity_operations video_mux_ops = {
	.link_setup = video_mux_link_setup,
	.link_validate = v4l2_subdev_link_validate,
};

static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
	struct v4l2_subdev *upstream_sd;
	struct media_pad *pad;

	if (vmux->active == -1) {
		dev_err(sd->dev, "Can not start streaming on inactive mux\n");
		return -EINVAL;
	}

	pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
	if (!pad) {
		dev_err(sd->dev, "Failed to find remote source pad\n");
		return -ENOLINK;
	}

	if (!is_media_entity_v4l2_subdev(pad->entity)) {
		dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
		return -ENODEV;
	}

	upstream_sd = media_entity_to_v4l2_subdev(pad->entity);

	return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
}

static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
	.s_stream = video_mux_s_stream,
};

static struct v4l2_mbus_framefmt *
__video_mux_get_pad_format(struct v4l2_subdev *sd,
			   struct v4l2_subdev_pad_config *cfg,
			   unsigned int pad, u32 which)
{
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);

	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &vmux->format_mbus[pad];
	default:
		return NULL;
	}
}

static int video_mux_get_format(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *sdformat)
{
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);

	mutex_lock(&vmux->lock);

	sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
						       sdformat->which);

	mutex_unlock(&vmux->lock);

	return 0;
}

static int video_mux_set_format(struct v4l2_subdev *sd,
			    struct v4l2_subdev_pad_config *cfg,
			    struct v4l2_subdev_format *sdformat)
{
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
	struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
	struct media_pad *pad = &vmux->pads[sdformat->pad];
	u16 source_pad = sd->entity.num_pads - 1;

	mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
					    sdformat->which);
	if (!mbusformat)
		return -EINVAL;

	source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
						       sdformat->which);
	if (!source_mbusformat)
		return -EINVAL;

	/* No size limitations except V4L2 compliance requirements */
	v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
			      &sdformat->format.height, 1, 65536, 0, 0);

	/* All formats except LVDS and vendor specific formats are acceptable */
	switch (sdformat->format.code) {
	case MEDIA_BUS_FMT_RGB444_1X12:
	case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
	case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
	case MEDIA_BUS_FMT_RGB565_1X16:
	case MEDIA_BUS_FMT_BGR565_2X8_BE:
	case MEDIA_BUS_FMT_BGR565_2X8_LE:
	case MEDIA_BUS_FMT_RGB565_2X8_BE:
	case MEDIA_BUS_FMT_RGB565_2X8_LE:
	case MEDIA_BUS_FMT_RGB666_1X18:
	case MEDIA_BUS_FMT_RBG888_1X24:
	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
	case MEDIA_BUS_FMT_BGR888_1X24:
	case MEDIA_BUS_FMT_GBR888_1X24:
	case MEDIA_BUS_FMT_RGB888_1X24:
	case MEDIA_BUS_FMT_RGB888_2X12_BE:
	case MEDIA_BUS_FMT_RGB888_2X12_LE:
	case MEDIA_BUS_FMT_ARGB8888_1X32:
	case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
	case MEDIA_BUS_FMT_RGB101010_1X30:
	case MEDIA_BUS_FMT_RGB121212_1X36:
	case MEDIA_BUS_FMT_RGB161616_1X48:
	case MEDIA_BUS_FMT_Y8_1X8:
	case MEDIA_BUS_FMT_UV8_1X8:
	case MEDIA_BUS_FMT_UYVY8_1_5X8:
	case MEDIA_BUS_FMT_VYUY8_1_5X8:
	case MEDIA_BUS_FMT_YUYV8_1_5X8:
	case MEDIA_BUS_FMT_YVYU8_1_5X8:
	case MEDIA_BUS_FMT_UYVY8_2X8:
	case MEDIA_BUS_FMT_VYUY8_2X8:
	case MEDIA_BUS_FMT_YUYV8_2X8:
	case MEDIA_BUS_FMT_YVYU8_2X8:
	case MEDIA_BUS_FMT_Y10_1X10:
	case MEDIA_BUS_FMT_UYVY10_2X10:
	case MEDIA_BUS_FMT_VYUY10_2X10:
	case MEDIA_BUS_FMT_YUYV10_2X10:
	case MEDIA_BUS_FMT_YVYU10_2X10:
	case MEDIA_BUS_FMT_Y12_1X12:
	case MEDIA_BUS_FMT_UYVY12_2X12:
	case MEDIA_BUS_FMT_VYUY12_2X12:
	case MEDIA_BUS_FMT_YUYV12_2X12:
	case MEDIA_BUS_FMT_YVYU12_2X12:
	case MEDIA_BUS_FMT_UYVY8_1X16:
	case MEDIA_BUS_FMT_VYUY8_1X16:
	case MEDIA_BUS_FMT_YUYV8_1X16:
	case MEDIA_BUS_FMT_YVYU8_1X16:
	case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
	case MEDIA_BUS_FMT_UYVY10_1X20:
	case MEDIA_BUS_FMT_VYUY10_1X20:
	case MEDIA_BUS_FMT_YUYV10_1X20:
	case MEDIA_BUS_FMT_YVYU10_1X20:
	case MEDIA_BUS_FMT_VUY8_1X24:
	case MEDIA_BUS_FMT_YUV8_1X24:
	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
	case MEDIA_BUS_FMT_UYVY12_1X24:
	case MEDIA_BUS_FMT_VYUY12_1X24:
	case MEDIA_BUS_FMT_YUYV12_1X24:
	case MEDIA_BUS_FMT_YVYU12_1X24:
	case MEDIA_BUS_FMT_YUV10_1X30:
	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
	case MEDIA_BUS_FMT_AYUV8_1X32:
	case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
	case MEDIA_BUS_FMT_YUV12_1X36:
	case MEDIA_BUS_FMT_YUV16_1X48:
	case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
	case MEDIA_BUS_FMT_JPEG_1X8:
	case MEDIA_BUS_FMT_AHSV8888_1X32:
		break;
	default:
		sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
		break;
	}
	if (sdformat->format.field == V4L2_FIELD_ANY)
		sdformat->format.field = V4L2_FIELD_NONE;

	mutex_lock(&vmux->lock);

	/* Source pad mirrors active sink pad, no limitations on sink pads */
	if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
		sdformat->format = vmux->format_mbus[vmux->active];

	*mbusformat = sdformat->format;

	/* Propagate the format from an active sink to source */
	if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
		*source_mbusformat = sdformat->format;

	mutex_unlock(&vmux->lock);

	return 0;
}

static int video_mux_init_cfg(struct v4l2_subdev *sd,
			      struct v4l2_subdev_pad_config *cfg)
{
	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
	struct v4l2_mbus_framefmt *mbusformat;
	unsigned int i;

	mutex_lock(&vmux->lock);

	for (i = 0; i < sd->entity.num_pads; i++) {
		mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
		*mbusformat = video_mux_format_mbus_default;
	}

	mutex_unlock(&vmux->lock);

	return 0;
}

static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
	.init_cfg = video_mux_init_cfg,
	.get_fmt = video_mux_get_format,
	.set_fmt = video_mux_set_format,
};

static const struct v4l2_subdev_ops video_mux_subdev_ops = {
	.pad = &video_mux_pad_ops,
	.video = &video_mux_subdev_video_ops,
};

static int video_mux_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	struct device_node *ep;
	struct video_mux *vmux;
	unsigned int num_pads = 0;
	unsigned int i;
	int ret;

	vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
	if (!vmux)
		return -ENOMEM;

	platform_set_drvdata(pdev, vmux);

	v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
	snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%s", np->name);
	vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	vmux->subdev.dev = dev;

	/*
	 * The largest numbered port is the output port. It determines
	 * total number of pads.
	 */
	for_each_endpoint_of_node(np, ep) {
		struct of_endpoint endpoint;

		of_graph_parse_endpoint(ep, &endpoint);
		num_pads = max(num_pads, endpoint.port + 1);
	}

	if (num_pads < 2) {
		dev_err(dev, "Not enough ports %d\n", num_pads);
		return -EINVAL;
	}

	vmux->mux = devm_mux_control_get(dev, NULL);
	if (IS_ERR(vmux->mux)) {
		ret = PTR_ERR(vmux->mux);
		if (ret != -EPROBE_DEFER)
			dev_err(dev, "Failed to get mux: %d\n", ret);
		return ret;
	}

	mutex_init(&vmux->lock);
	vmux->active = -1;
	vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
				  GFP_KERNEL);
	vmux->format_mbus = devm_kcalloc(dev, num_pads,
					 sizeof(*vmux->format_mbus),
					 GFP_KERNEL);

	for (i = 0; i < num_pads; i++) {
		vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
							 : MEDIA_PAD_FL_SOURCE;
		vmux->format_mbus[i] = video_mux_format_mbus_default;
	}

	vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
	ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
				     vmux->pads);
	if (ret < 0)
		return ret;

	vmux->subdev.entity.ops = &video_mux_ops;

	return v4l2_async_register_subdev(&vmux->subdev);
}

static int video_mux_remove(struct platform_device *pdev)
{
	struct video_mux *vmux = platform_get_drvdata(pdev);
	struct v4l2_subdev *sd = &vmux->subdev;

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);

	return 0;
}

static const struct of_device_id video_mux_dt_ids[] = {
	{ .compatible = "video-mux", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, video_mux_dt_ids);

static struct platform_driver video_mux_driver = {
	.probe		= video_mux_probe,
	.remove		= video_mux_remove,
	.driver		= {
		.of_match_table = video_mux_dt_ids,
		.name = "video-mux",
	},
};

module_platform_driver(video_mux_driver);

MODULE_DESCRIPTION("video stream multiplexer");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_AUTHOR("Philipp Zabel, Pengutronix");
MODULE_LICENSE("GPL");