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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/drivers/media/usb/au0828/au0828-core.c
....@@ -1,18 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  Driver for the Auvitek USB bridge
34  *
45  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
5
- *
6
- *  This program is free software; you can redistribute it and/or modify
7
- *  it under the terms of the GNU General Public License as published by
8
- *  the Free Software Foundation; either version 2 of the License, or
9
- *  (at your option) any later version.
10
- *
11
- *  This program is distributed in the hope that it will be useful,
12
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- *
15
- *  GNU General Public License for more details.
166  */
177 
188 #include "au0828.h"
....@@ -155,9 +145,7 @@
155145 	dev->media_dev->disable_source = NULL;
156146 	mutex_unlock(&mdev->graph_mutex);
157147 
158
-	media_device_unregister(dev->media_dev);
159
-	media_device_cleanup(dev->media_dev);
160
-	kfree(dev->media_dev);
148
+	media_device_delete(dev->media_dev, KBUILD_MODNAME, THIS_MODULE);
161149 	dev->media_dev = NULL;
162150 #endif
163151 }
....@@ -210,13 +198,9 @@
210198 #ifdef CONFIG_MEDIA_CONTROLLER
211199 	struct media_device *mdev;
212200 
213
-	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
214
-	if (!mdev)
215
-		return -ENOMEM;
216
-
217
-	/* check if media device is already initialized */
218
-	if (!mdev->dev)
219
-		media_device_usb_init(mdev, udev, udev->product);
201
+	mdev = media_device_usb_allocate(udev, KBUILD_MODNAME, THIS_MODULE);
202
+	if (IS_ERR(mdev))
203
+		return PTR_ERR(mdev);
220204 
221205 	dev->media_dev = mdev;
222206 #endif
....@@ -234,7 +218,7 @@
234218 	if (!new) {
235219 		/*
236220 		 * Called during au0828 probe time to connect
237
-		 * entites that were created prior to registering
221
+		 * entities that were created prior to registering
238222 		 * the notify handler. Find mixer and decoder.
239223 		*/
240224 		media_device_for_each_entity(entity, dev->media_dev) {
....@@ -266,14 +250,38 @@
266250 
267251 create_link:
268252 	if (decoder && mixer) {
269
-		ret = media_create_pad_link(decoder,
270
-					    DEMOD_PAD_AUDIO_OUT,
271
-					    mixer, 0,
272
-					    MEDIA_LNK_FL_ENABLED);
273
-		if (ret)
253
+		ret = media_get_pad_index(decoder, false,
254
+					  PAD_SIGNAL_AUDIO);
255
+		if (ret >= 0)
256
+			ret = media_create_pad_link(decoder, ret,
257
+						    mixer, 0,
258
+						    MEDIA_LNK_FL_ENABLED);
259
+		if (ret < 0)
274260 			dev_err(&dev->usbdev->dev,
275261 				"Mixer Pad Link Create Error: %d\n", ret);
276262 	}
263
+}
264
+
265
+static bool au0828_is_link_shareable(struct media_entity *owner,
266
+				     struct media_entity *entity)
267
+{
268
+	bool shareable = false;
269
+
270
+	/* Tuner link can be shared by audio, video, and VBI */
271
+	switch (owner->function) {
272
+	case MEDIA_ENT_F_IO_V4L:
273
+	case MEDIA_ENT_F_AUDIO_CAPTURE:
274
+	case MEDIA_ENT_F_IO_VBI:
275
+		if (entity->function == MEDIA_ENT_F_IO_V4L ||
276
+		    entity->function == MEDIA_ENT_F_AUDIO_CAPTURE ||
277
+		    entity->function == MEDIA_ENT_F_IO_VBI)
278
+			shareable = true;
279
+		break;
280
+	case MEDIA_ENT_F_DTV_DEMOD:
281
+	default:
282
+		break;
283
+	}
284
+	return shareable;
277285 }
278286 
279287 /* Callers should hold graph_mutex */
....@@ -318,18 +326,20 @@
318326 		/*
319327 		 * Default input is tuner and default input_type
320328 		 * is AU0828_VMUX_TELEVISION.
321
-		 * FIXME:
329
+		 *
322330 		 * There is a problem when s_input is called to
323331 		 * change the default input. s_input will try to
324332 		 * enable_source before attempting to change the
325333 		 * input on the device, and will end up enabling
326334 		 * default source which is tuner.
327335 		 *
328
-		 * Additional logic is necessary in au0828
329
-		 * to detect that the input has changed and
330
-		 * enable the right source.
336
+		 * Additional logic is necessary in au0828 to detect
337
+		 * that the input has changed and enable the right
338
+		 * source. au0828 handles this case in its s_input.
339
+		 * It will disable the old source and enable the new
340
+		 * source.
341
+		 *
331342 		*/
332
-
333343 		if (dev->input_type == AU0828_VMUX_TELEVISION)
334344 			find_source = dev->tuner;
335345 		else if (dev->input_type == AU0828_VMUX_SVIDEO ||
....@@ -342,27 +352,33 @@
342352 		}
343353 	}
344354 
345
-	/* Is an active link between sink and source */
355
+	/* Is there an active link between sink and source */
346356 	if (dev->active_link) {
347
-		/*
348
-		 * If DVB is using the tuner and calling entity is
349
-		 * audio/video, the following check will be false,
350
-		 * since sink is different. Result is Busy.
351
-		 */
352
-		if (dev->active_link->sink->entity == sink &&
353
-		    dev->active_link->source->entity == find_source) {
354
-			/*
355
-			 * Either ALSA or Video own tuner. sink is
356
-			 * the same for both. Prevent Video stepping
357
-			 * on ALSA when ALSA owns the source.
357
+		if (dev->active_link_owner == entity) {
358
+			/* This check is necessary to handle multiple
359
+			 * enable_source calls from v4l_ioctls during
360
+			 * the course of video/vbi application run-time.
358361 			*/
359
-			if (dev->active_link_owner != entity &&
360
-			    dev->active_link_owner->function ==
361
-						MEDIA_ENT_F_AUDIO_CAPTURE) {
362
-				pr_debug("ALSA has the tuner\n");
363
-				ret = -EBUSY;
364
-				goto end;
365
-			}
362
+			pr_debug("%s already owns the tuner\n", entity->name);
363
+			ret = 0;
364
+			goto end;
365
+		} else if (au0828_is_link_shareable(dev->active_link_owner,
366
+			   entity)) {
367
+			/* Either ALSA or Video own tuner. Sink is the same
368
+			 * for both. Allow sharing the active link between
369
+			 * their common source (tuner) and sink (decoder).
370
+			 * Starting pipeline between sharing entity and sink
371
+			 * will fail with pipe mismatch, while owner has an
372
+			 * active pipeline. Switch pipeline ownership from
373
+			 * user to owner when owner disables the source.
374
+			 */
375
+			dev->active_link_shared = true;
376
+			/* save the user info to use from disable */
377
+			dev->active_link_user = entity;
378
+			dev->active_link_user_pipe = pipe;
379
+			pr_debug("%s owns the tuner %s can share!\n",
380
+				 dev->active_link_owner->name,
381
+				 entity->name);
366382 			ret = 0;
367383 			goto end;
368384 		} else {
....@@ -389,7 +405,7 @@
389405 	source = found_link->source->entity;
390406 	ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
391407 	if (ret) {
392
-		pr_err("Activate tuner link %s->%s. Error %d\n",
408
+		pr_err("Activate link from %s->%s. Error %d\n",
393409 			source->name, sink->name, ret);
394410 		goto end;
395411 	}
....@@ -399,25 +415,26 @@
399415 		pr_err("Start Pipeline: %s->%s Error %d\n",
400416 			source->name, entity->name, ret);
401417 		ret = __media_entity_setup_link(found_link, 0);
402
-		pr_err("Deactivate link Error %d\n", ret);
418
+		if (ret)
419
+			pr_err("Deactivate link Error %d\n", ret);
403420 		goto end;
404421 	}
405
-	/*
406
-	 * save active link and active link owner to avoid audio
407
-	 * deactivating video owned link from disable_source and
408
-	 * vice versa
422
+
423
+	/* save link state to allow audio and video share the link
424
+	 * and not disable the link while the other is using it.
425
+	 * active_link_owner is used to deactivate the link.
409426 	*/
410427 	dev->active_link = found_link;
411428 	dev->active_link_owner = entity;
412429 	dev->active_source = source;
413430 	dev->active_sink = sink;
414431 
415
-	pr_debug("Enabled Source: %s->%s->%s Ret %d\n",
432
+	pr_info("Enabled Source: %s->%s->%s Ret %d\n",
416433 		 dev->active_source->name, dev->active_sink->name,
417434 		 dev->active_link_owner->name, ret);
418435 end:
419
-	pr_debug("au0828_enable_source() end %s %d %d\n",
420
-		 entity->name, entity->function, ret);
436
+	pr_debug("%s end: ent:%s fnc:%d ret %d\n",
437
+		 __func__, entity->name, entity->function, ret);
421438 	return ret;
422439 }
423440 
....@@ -436,21 +453,95 @@
436453 	if (!dev->active_link)
437454 		return;
438455 
439
-	/* link is active - stop pipeline from source (tuner) */
456
+	/* link is active - stop pipeline from source
457
+	 * (tuner/s-video/Composite) to the entity
458
+	 * When DVB/s-video/Composite owns tuner, it won't be in
459
+	 * shared state.
460
+	 */
440461 	if (dev->active_link->sink->entity == dev->active_sink &&
441462 	    dev->active_link->source->entity == dev->active_source) {
442463 		/*
443
-		 * prevent video from deactivating link when audio
444
-		 * has active pipeline
464
+		 * Prevent video from deactivating link when audio
465
+		 * has active pipeline and vice versa. In addition
466
+		 * handle the case when more than one video/vbi
467
+		 * application is sharing the link.
445468 		*/
469
+		bool owner_is_audio = false;
470
+
471
+		if (dev->active_link_owner->function ==
472
+		    MEDIA_ENT_F_AUDIO_CAPTURE)
473
+			owner_is_audio = true;
474
+
475
+		if (dev->active_link_shared) {
476
+			pr_debug("Shared link owner %s user %s %d\n",
477
+				 dev->active_link_owner->name,
478
+				 entity->name, dev->users);
479
+
480
+			/* Handle video device users > 1
481
+			 * When audio owns the shared link with
482
+			 * more than one video users, avoid
483
+			 * disabling the source and/or switching
484
+			 * the owner until the last disable_source
485
+			 * call from video _close(). Use dev->users to
486
+			 * determine when to switch/disable.
487
+			 */
488
+			if (dev->active_link_owner != entity) {
489
+				/* video device has users > 1 */
490
+				if (owner_is_audio && dev->users > 1)
491
+					return;
492
+
493
+				dev->active_link_user = NULL;
494
+				dev->active_link_user_pipe = NULL;
495
+				dev->active_link_shared = false;
496
+				return;
497
+			}
498
+
499
+			/* video owns the link and has users > 1 */
500
+			if (!owner_is_audio && dev->users > 1)
501
+				return;
502
+
503
+			/* stop pipeline */
504
+			__media_pipeline_stop(dev->active_link_owner);
505
+			pr_debug("Pipeline stop for %s\n",
506
+				dev->active_link_owner->name);
507
+
508
+			ret = __media_pipeline_start(
509
+					dev->active_link_user,
510
+					dev->active_link_user_pipe);
511
+			if (ret) {
512
+				pr_err("Start Pipeline: %s->%s %d\n",
513
+					dev->active_source->name,
514
+					dev->active_link_user->name,
515
+					ret);
516
+				goto deactivate_link;
517
+			}
518
+			/* link user is now the owner */
519
+			dev->active_link_owner = dev->active_link_user;
520
+			dev->active_link_user = NULL;
521
+			dev->active_link_user_pipe = NULL;
522
+			dev->active_link_shared = false;
523
+
524
+			pr_debug("Pipeline started for %s\n",
525
+				dev->active_link_owner->name);
526
+			return;
527
+		} else if (!owner_is_audio && dev->users > 1)
528
+			/* video/vbi owns the link and has users > 1 */
529
+			return;
530
+
446531 		if (dev->active_link_owner != entity)
447532 			return;
448
-		__media_pipeline_stop(entity);
533
+
534
+		/* stop pipeline */
535
+		__media_pipeline_stop(dev->active_link_owner);
536
+		pr_debug("Pipeline stop for %s\n",
537
+			dev->active_link_owner->name);
538
+
539
+deactivate_link:
449540 		ret = __media_entity_setup_link(dev->active_link, 0);
450541 		if (ret)
451542 			pr_err("Deactivate link Error %d\n", ret);
452543 
453
-		pr_debug("Disabled Source: %s->%s->%s Ret %d\n",
544
+		pr_info("Disabled Source: %s->%s->%s Ret %d\n",
454545 			 dev->active_source->name, dev->active_sink->name,
455546 			 dev->active_link_owner->name, ret);
456547 
....@@ -458,6 +549,8 @@
458549 		dev->active_link_owner = NULL;
459550 		dev->active_source = NULL;
460551 		dev->active_sink = NULL;
552
+		dev->active_link_shared = false;
553
+		dev->active_link_user = NULL;
461554 	}
462555 }
463556 #endif
....@@ -478,6 +571,9 @@
478571 		/* register media device */
479572 		ret = media_device_register(dev->media_dev);
480573 		if (ret) {
574
+			media_device_delete(dev->media_dev, KBUILD_MODNAME,
575
+					    THIS_MODULE);
576
+			dev->media_dev = NULL;
481577 			dev_err(&udev->dev,
482578 				"Media Device Register Error: %d\n", ret);
483579 			return ret;