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9#include <linux/err.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/mux/consumer.h>
13#include <linux/of.h>
14#include <linux/of_graph.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <media/v4l2-async.h>
18#include <media/v4l2-device.h>
19#include <media/v4l2-fwnode.h>
20#include <media/v4l2-mc.h>
21#include <media/v4l2-subdev.h>
22
23struct video_mux {
24 struct v4l2_subdev subdev;
25 struct v4l2_async_notifier notifier;
26 struct media_pad *pads;
27 struct v4l2_mbus_framefmt *format_mbus;
28 struct mux_control *mux;
29 struct mutex lock;
30 int active;
31};
32
33static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
34 .width = 1,
35 .height = 1,
36 .code = MEDIA_BUS_FMT_Y8_1X8,
37 .field = V4L2_FIELD_NONE,
38};
39
40static inline struct video_mux *
41notifier_to_video_mux(struct v4l2_async_notifier *n)
42{
43 return container_of(n, struct video_mux, notifier);
44}
45
46static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
47{
48 return container_of(sd, struct video_mux, subdev);
49}
50
51static int video_mux_link_setup(struct media_entity *entity,
52 const struct media_pad *local,
53 const struct media_pad *remote, u32 flags)
54{
55 struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
56 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
57 u16 source_pad = entity->num_pads - 1;
58 int ret = 0;
59
60
61
62
63
64 if (local->flags & MEDIA_PAD_FL_SOURCE)
65 return 0;
66
67 dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
68 remote->entity->name, remote->index, local->entity->name,
69 local->index, flags & MEDIA_LNK_FL_ENABLED);
70
71 mutex_lock(&vmux->lock);
72
73 if (flags & MEDIA_LNK_FL_ENABLED) {
74 if (vmux->active == local->index)
75 goto out;
76
77 if (vmux->active >= 0) {
78 ret = -EBUSY;
79 goto out;
80 }
81
82 dev_dbg(sd->dev, "setting %d active\n", local->index);
83 ret = mux_control_try_select(vmux->mux, local->index);
84 if (ret < 0)
85 goto out;
86 vmux->active = local->index;
87
88
89 vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
90 } else {
91 if (vmux->active != local->index)
92 goto out;
93
94 dev_dbg(sd->dev, "going inactive\n");
95 mux_control_deselect(vmux->mux);
96 vmux->active = -1;
97 }
98
99out:
100 mutex_unlock(&vmux->lock);
101 return ret;
102}
103
104static const struct media_entity_operations video_mux_ops = {
105 .link_setup = video_mux_link_setup,
106 .link_validate = v4l2_subdev_link_validate,
107 .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
108};
109
110static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
111{
112 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
113 struct v4l2_subdev *upstream_sd;
114 struct media_pad *pad;
115
116 if (vmux->active == -1) {
117 dev_err(sd->dev, "Can not start streaming on inactive mux\n");
118 return -EINVAL;
119 }
120
121 pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
122 if (!pad) {
123 dev_err(sd->dev, "Failed to find remote source pad\n");
124 return -ENOLINK;
125 }
126
127 if (!is_media_entity_v4l2_subdev(pad->entity)) {
128 dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
129 return -ENODEV;
130 }
131
132 upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
133
134 return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
135}
136
137static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
138 .s_stream = video_mux_s_stream,
139};
140
141static struct v4l2_mbus_framefmt *
142__video_mux_get_pad_format(struct v4l2_subdev *sd,
143 struct v4l2_subdev_state *sd_state,
144 unsigned int pad, u32 which)
145{
146 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
147
148 switch (which) {
149 case V4L2_SUBDEV_FORMAT_TRY:
150 return v4l2_subdev_get_try_format(sd, sd_state, pad);
151 case V4L2_SUBDEV_FORMAT_ACTIVE:
152 return &vmux->format_mbus[pad];
153 default:
154 return NULL;
155 }
156}
157
158static int video_mux_get_format(struct v4l2_subdev *sd,
159 struct v4l2_subdev_state *sd_state,
160 struct v4l2_subdev_format *sdformat)
161{
162 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
163
164 mutex_lock(&vmux->lock);
165
166 sdformat->format = *__video_mux_get_pad_format(sd, sd_state,
167 sdformat->pad,
168 sdformat->which);
169
170 mutex_unlock(&vmux->lock);
171
172 return 0;
173}
174
175static int video_mux_set_format(struct v4l2_subdev *sd,
176 struct v4l2_subdev_state *sd_state,
177 struct v4l2_subdev_format *sdformat)
178{
179 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
180 struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
181 struct media_pad *pad = &vmux->pads[sdformat->pad];
182 u16 source_pad = sd->entity.num_pads - 1;
183
184 mbusformat = __video_mux_get_pad_format(sd, sd_state, sdformat->pad,
185 sdformat->which);
186 if (!mbusformat)
187 return -EINVAL;
188
189 source_mbusformat = __video_mux_get_pad_format(sd, sd_state,
190 source_pad,
191 sdformat->which);
192 if (!source_mbusformat)
193 return -EINVAL;
194
195
196 v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
197 &sdformat->format.height, 1, 65536, 0, 0);
198
199
200 switch (sdformat->format.code) {
201 case MEDIA_BUS_FMT_RGB444_1X12:
202 case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
203 case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
204 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
205 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
206 case MEDIA_BUS_FMT_RGB565_1X16:
207 case MEDIA_BUS_FMT_BGR565_2X8_BE:
208 case MEDIA_BUS_FMT_BGR565_2X8_LE:
209 case MEDIA_BUS_FMT_RGB565_2X8_BE:
210 case MEDIA_BUS_FMT_RGB565_2X8_LE:
211 case MEDIA_BUS_FMT_RGB666_1X18:
212 case MEDIA_BUS_FMT_RBG888_1X24:
213 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
214 case MEDIA_BUS_FMT_BGR888_1X24:
215 case MEDIA_BUS_FMT_GBR888_1X24:
216 case MEDIA_BUS_FMT_RGB888_1X24:
217 case MEDIA_BUS_FMT_RGB888_2X12_BE:
218 case MEDIA_BUS_FMT_RGB888_2X12_LE:
219 case MEDIA_BUS_FMT_ARGB8888_1X32:
220 case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
221 case MEDIA_BUS_FMT_RGB101010_1X30:
222 case MEDIA_BUS_FMT_RGB121212_1X36:
223 case MEDIA_BUS_FMT_RGB161616_1X48:
224 case MEDIA_BUS_FMT_Y8_1X8:
225 case MEDIA_BUS_FMT_UV8_1X8:
226 case MEDIA_BUS_FMT_UYVY8_1_5X8:
227 case MEDIA_BUS_FMT_VYUY8_1_5X8:
228 case MEDIA_BUS_FMT_YUYV8_1_5X8:
229 case MEDIA_BUS_FMT_YVYU8_1_5X8:
230 case MEDIA_BUS_FMT_UYVY8_2X8:
231 case MEDIA_BUS_FMT_VYUY8_2X8:
232 case MEDIA_BUS_FMT_YUYV8_2X8:
233 case MEDIA_BUS_FMT_YVYU8_2X8:
234 case MEDIA_BUS_FMT_Y10_1X10:
235 case MEDIA_BUS_FMT_UYVY10_2X10:
236 case MEDIA_BUS_FMT_VYUY10_2X10:
237 case MEDIA_BUS_FMT_YUYV10_2X10:
238 case MEDIA_BUS_FMT_YVYU10_2X10:
239 case MEDIA_BUS_FMT_Y12_1X12:
240 case MEDIA_BUS_FMT_UYVY12_2X12:
241 case MEDIA_BUS_FMT_VYUY12_2X12:
242 case MEDIA_BUS_FMT_YUYV12_2X12:
243 case MEDIA_BUS_FMT_YVYU12_2X12:
244 case MEDIA_BUS_FMT_UYVY8_1X16:
245 case MEDIA_BUS_FMT_VYUY8_1X16:
246 case MEDIA_BUS_FMT_YUYV8_1X16:
247 case MEDIA_BUS_FMT_YVYU8_1X16:
248 case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
249 case MEDIA_BUS_FMT_UYVY10_1X20:
250 case MEDIA_BUS_FMT_VYUY10_1X20:
251 case MEDIA_BUS_FMT_YUYV10_1X20:
252 case MEDIA_BUS_FMT_YVYU10_1X20:
253 case MEDIA_BUS_FMT_VUY8_1X24:
254 case MEDIA_BUS_FMT_YUV8_1X24:
255 case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
256 case MEDIA_BUS_FMT_UYVY12_1X24:
257 case MEDIA_BUS_FMT_VYUY12_1X24:
258 case MEDIA_BUS_FMT_YUYV12_1X24:
259 case MEDIA_BUS_FMT_YVYU12_1X24:
260 case MEDIA_BUS_FMT_YUV10_1X30:
261 case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
262 case MEDIA_BUS_FMT_AYUV8_1X32:
263 case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
264 case MEDIA_BUS_FMT_YUV12_1X36:
265 case MEDIA_BUS_FMT_YUV16_1X48:
266 case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
267 case MEDIA_BUS_FMT_JPEG_1X8:
268 case MEDIA_BUS_FMT_AHSV8888_1X32:
269 case MEDIA_BUS_FMT_SBGGR8_1X8:
270 case MEDIA_BUS_FMT_SGBRG8_1X8:
271 case MEDIA_BUS_FMT_SGRBG8_1X8:
272 case MEDIA_BUS_FMT_SRGGB8_1X8:
273 case MEDIA_BUS_FMT_SBGGR10_1X10:
274 case MEDIA_BUS_FMT_SGBRG10_1X10:
275 case MEDIA_BUS_FMT_SGRBG10_1X10:
276 case MEDIA_BUS_FMT_SRGGB10_1X10:
277 case MEDIA_BUS_FMT_SBGGR12_1X12:
278 case MEDIA_BUS_FMT_SGBRG12_1X12:
279 case MEDIA_BUS_FMT_SGRBG12_1X12:
280 case MEDIA_BUS_FMT_SRGGB12_1X12:
281 case MEDIA_BUS_FMT_SBGGR14_1X14:
282 case MEDIA_BUS_FMT_SGBRG14_1X14:
283 case MEDIA_BUS_FMT_SGRBG14_1X14:
284 case MEDIA_BUS_FMT_SRGGB14_1X14:
285 case MEDIA_BUS_FMT_SBGGR16_1X16:
286 case MEDIA_BUS_FMT_SGBRG16_1X16:
287 case MEDIA_BUS_FMT_SGRBG16_1X16:
288 case MEDIA_BUS_FMT_SRGGB16_1X16:
289 break;
290 default:
291 sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
292 break;
293 }
294 if (sdformat->format.field == V4L2_FIELD_ANY)
295 sdformat->format.field = V4L2_FIELD_NONE;
296
297 mutex_lock(&vmux->lock);
298
299
300 if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
301 sdformat->format = vmux->format_mbus[vmux->active];
302
303 *mbusformat = sdformat->format;
304
305
306 if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
307 *source_mbusformat = sdformat->format;
308
309 mutex_unlock(&vmux->lock);
310
311 return 0;
312}
313
314static int video_mux_init_cfg(struct v4l2_subdev *sd,
315 struct v4l2_subdev_state *sd_state)
316{
317 struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
318 struct v4l2_mbus_framefmt *mbusformat;
319 unsigned int i;
320
321 mutex_lock(&vmux->lock);
322
323 for (i = 0; i < sd->entity.num_pads; i++) {
324 mbusformat = v4l2_subdev_get_try_format(sd, sd_state, i);
325 *mbusformat = video_mux_format_mbus_default;
326 }
327
328 mutex_unlock(&vmux->lock);
329
330 return 0;
331}
332
333static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
334 .init_cfg = video_mux_init_cfg,
335 .get_fmt = video_mux_get_format,
336 .set_fmt = video_mux_set_format,
337};
338
339static const struct v4l2_subdev_ops video_mux_subdev_ops = {
340 .pad = &video_mux_pad_ops,
341 .video = &video_mux_subdev_video_ops,
342};
343
344static int video_mux_notify_bound(struct v4l2_async_notifier *notifier,
345 struct v4l2_subdev *sd,
346 struct v4l2_async_subdev *asd)
347{
348 struct video_mux *vmux = notifier_to_video_mux(notifier);
349
350 return v4l2_create_fwnode_links(sd, &vmux->subdev);
351}
352
353static const struct v4l2_async_notifier_operations video_mux_notify_ops = {
354 .bound = video_mux_notify_bound,
355};
356
357static int video_mux_async_register(struct video_mux *vmux,
358 unsigned int num_input_pads)
359{
360 unsigned int i;
361 int ret;
362
363 v4l2_async_notifier_init(&vmux->notifier);
364
365 for (i = 0; i < num_input_pads; i++) {
366 struct v4l2_async_subdev *asd;
367 struct fwnode_handle *ep, *remote_ep;
368
369 ep = fwnode_graph_get_endpoint_by_id(
370 dev_fwnode(vmux->subdev.dev), i, 0,
371 FWNODE_GRAPH_ENDPOINT_NEXT);
372 if (!ep)
373 continue;
374
375
376 remote_ep = fwnode_graph_get_remote_endpoint(ep);
377 if (!remote_ep) {
378 fwnode_handle_put(ep);
379 continue;
380 }
381 fwnode_handle_put(remote_ep);
382
383 asd = v4l2_async_notifier_add_fwnode_remote_subdev(
384 &vmux->notifier, ep, struct v4l2_async_subdev);
385
386 fwnode_handle_put(ep);
387
388 if (IS_ERR(asd)) {
389 ret = PTR_ERR(asd);
390
391 if (ret != -EEXIST)
392 return ret;
393 }
394 }
395
396 vmux->notifier.ops = &video_mux_notify_ops;
397
398 ret = v4l2_async_subdev_notifier_register(&vmux->subdev,
399 &vmux->notifier);
400 if (ret)
401 return ret;
402
403 return v4l2_async_register_subdev(&vmux->subdev);
404}
405
406static int video_mux_probe(struct platform_device *pdev)
407{
408 struct device_node *np = pdev->dev.of_node;
409 struct device *dev = &pdev->dev;
410 struct device_node *ep;
411 struct video_mux *vmux;
412 unsigned int num_pads = 0;
413 unsigned int i;
414 int ret;
415
416 vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
417 if (!vmux)
418 return -ENOMEM;
419
420 platform_set_drvdata(pdev, vmux);
421
422 v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
423 snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);
424 vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
425 vmux->subdev.dev = dev;
426
427
428
429
430
431 for_each_endpoint_of_node(np, ep) {
432 struct of_endpoint endpoint;
433
434 of_graph_parse_endpoint(ep, &endpoint);
435 num_pads = max(num_pads, endpoint.port + 1);
436 }
437
438 if (num_pads < 2) {
439 dev_err(dev, "Not enough ports %d\n", num_pads);
440 return -EINVAL;
441 }
442
443 vmux->mux = devm_mux_control_get(dev, NULL);
444 if (IS_ERR(vmux->mux)) {
445 ret = PTR_ERR(vmux->mux);
446 if (ret != -EPROBE_DEFER)
447 dev_err(dev, "Failed to get mux: %d\n", ret);
448 return ret;
449 }
450
451 mutex_init(&vmux->lock);
452 vmux->active = -1;
453 vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
454 GFP_KERNEL);
455 if (!vmux->pads)
456 return -ENOMEM;
457
458 vmux->format_mbus = devm_kcalloc(dev, num_pads,
459 sizeof(*vmux->format_mbus),
460 GFP_KERNEL);
461 if (!vmux->format_mbus)
462 return -ENOMEM;
463
464 for (i = 0; i < num_pads; i++) {
465 vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
466 : MEDIA_PAD_FL_SOURCE;
467 vmux->format_mbus[i] = video_mux_format_mbus_default;
468 }
469
470 vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
471 ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
472 vmux->pads);
473 if (ret < 0)
474 return ret;
475
476 vmux->subdev.entity.ops = &video_mux_ops;
477
478 ret = video_mux_async_register(vmux, num_pads - 1);
479 if (ret) {
480 v4l2_async_notifier_unregister(&vmux->notifier);
481 v4l2_async_notifier_cleanup(&vmux->notifier);
482 }
483
484 return ret;
485}
486
487static int video_mux_remove(struct platform_device *pdev)
488{
489 struct video_mux *vmux = platform_get_drvdata(pdev);
490 struct v4l2_subdev *sd = &vmux->subdev;
491
492 v4l2_async_notifier_unregister(&vmux->notifier);
493 v4l2_async_notifier_cleanup(&vmux->notifier);
494 v4l2_async_unregister_subdev(sd);
495 media_entity_cleanup(&sd->entity);
496
497 return 0;
498}
499
500static const struct of_device_id video_mux_dt_ids[] = {
501 { .compatible = "video-mux", },
502 { }
503};
504MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
505
506static struct platform_driver video_mux_driver = {
507 .probe = video_mux_probe,
508 .remove = video_mux_remove,
509 .driver = {
510 .of_match_table = video_mux_dt_ids,
511 .name = "video-mux",
512 },
513};
514
515module_platform_driver(video_mux_driver);
516
517MODULE_DESCRIPTION("video stream multiplexer");
518MODULE_AUTHOR("Sascha Hauer, Pengutronix");
519MODULE_AUTHOR("Philipp Zabel, Pengutronix");
520MODULE_LICENSE("GPL");
521
