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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * video stream multiplexer controlled via mux control4 *5 * Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>6 * Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>7 */8 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 mux_control *mux;28	struct mutex lock;29	int active;30};31 32static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {33	.width = 1,34	.height = 1,35	.code = MEDIA_BUS_FMT_Y8_1X8,36	.field = V4L2_FIELD_NONE,37};38 39static inline struct video_mux *40notifier_to_video_mux(struct v4l2_async_notifier *n)41{42	return container_of(n, struct video_mux, notifier);43}44 45static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)46{47	return container_of(sd, struct video_mux, subdev);48}49 50static int video_mux_link_setup(struct media_entity *entity,51				const struct media_pad *local,52				const struct media_pad *remote, u32 flags)53{54	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);55	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);56	u16 source_pad = entity->num_pads - 1;57	int ret = 0;58 59	/*60	 * The mux state is determined by the enabled sink pad link.61	 * Enabling or disabling the source pad link has no effect.62	 */63	if (local->flags & MEDIA_PAD_FL_SOURCE)64		return 0;65 66	dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",67		remote->entity->name, remote->index, local->entity->name,68		local->index, flags & MEDIA_LNK_FL_ENABLED);69 70	mutex_lock(&vmux->lock);71 72	if (flags & MEDIA_LNK_FL_ENABLED) {73		struct v4l2_subdev_state *sd_state;74		struct v4l2_mbus_framefmt *source_mbusformat;75 76		if (vmux->active == local->index)77			goto out;78 79		if (vmux->active >= 0) {80			ret = -EBUSY;81			goto out;82		}83 84		dev_dbg(sd->dev, "setting %d active\n", local->index);85		ret = mux_control_try_select(vmux->mux, local->index);86		if (ret < 0)87			goto out;88		vmux->active = local->index;89 90		/* Propagate the active format to the source */91		sd_state = v4l2_subdev_lock_and_get_active_state(sd);92		source_mbusformat = v4l2_subdev_state_get_format(sd_state,93								 source_pad);94		*source_mbusformat = *v4l2_subdev_state_get_format(sd_state,95								   vmux->active);96		v4l2_subdev_unlock_state(sd_state);97	} else {98		if (vmux->active != local->index)99			goto out;100 101		dev_dbg(sd->dev, "going inactive\n");102		mux_control_deselect(vmux->mux);103		vmux->active = -1;104	}105 106out:107	mutex_unlock(&vmux->lock);108	return ret;109}110 111static const struct media_entity_operations video_mux_ops = {112	.link_setup = video_mux_link_setup,113	.link_validate = v4l2_subdev_link_validate,114	.get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,115};116 117static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)118{119	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);120	struct v4l2_subdev *upstream_sd;121	struct media_pad *pad;122 123	if (vmux->active == -1) {124		dev_err(sd->dev, "Can not start streaming on inactive mux\n");125		return -EINVAL;126	}127 128	pad = media_pad_remote_pad_first(&sd->entity.pads[vmux->active]);129	if (!pad) {130		dev_err(sd->dev, "Failed to find remote source pad\n");131		return -ENOLINK;132	}133 134	if (!is_media_entity_v4l2_subdev(pad->entity)) {135		dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");136		return -ENODEV;137	}138 139	upstream_sd = media_entity_to_v4l2_subdev(pad->entity);140 141	return v4l2_subdev_call(upstream_sd, video, s_stream, enable);142}143 144static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {145	.s_stream = video_mux_s_stream,146};147 148static int video_mux_set_format(struct v4l2_subdev *sd,149			    struct v4l2_subdev_state *sd_state,150			    struct v4l2_subdev_format *sdformat)151{152	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);153	struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;154	struct media_pad *pad = &vmux->pads[sdformat->pad];155	u16 source_pad = sd->entity.num_pads - 1;156 157	mbusformat = v4l2_subdev_state_get_format(sd_state, sdformat->pad);158	if (!mbusformat)159		return -EINVAL;160 161	source_mbusformat = v4l2_subdev_state_get_format(sd_state, source_pad);162	if (!source_mbusformat)163		return -EINVAL;164 165	/* No size limitations except V4L2 compliance requirements */166	v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,167			      &sdformat->format.height, 1, 65536, 0, 0);168 169	/* All formats except LVDS and vendor specific formats are acceptable */170	switch (sdformat->format.code) {171	case MEDIA_BUS_FMT_RGB444_1X12:172	case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:173	case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:174	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:175	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:176	case MEDIA_BUS_FMT_RGB565_1X16:177	case MEDIA_BUS_FMT_BGR565_2X8_BE:178	case MEDIA_BUS_FMT_BGR565_2X8_LE:179	case MEDIA_BUS_FMT_RGB565_2X8_BE:180	case MEDIA_BUS_FMT_RGB565_2X8_LE:181	case MEDIA_BUS_FMT_RGB666_1X18:182	case MEDIA_BUS_FMT_RBG888_1X24:183	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:184	case MEDIA_BUS_FMT_BGR888_1X24:185	case MEDIA_BUS_FMT_GBR888_1X24:186	case MEDIA_BUS_FMT_RGB888_1X24:187	case MEDIA_BUS_FMT_RGB888_2X12_BE:188	case MEDIA_BUS_FMT_RGB888_2X12_LE:189	case MEDIA_BUS_FMT_ARGB8888_1X32:190	case MEDIA_BUS_FMT_RGB888_1X32_PADHI:191	case MEDIA_BUS_FMT_RGB101010_1X30:192	case MEDIA_BUS_FMT_RGB121212_1X36:193	case MEDIA_BUS_FMT_RGB161616_1X48:194	case MEDIA_BUS_FMT_Y8_1X8:195	case MEDIA_BUS_FMT_UV8_1X8:196	case MEDIA_BUS_FMT_UYVY8_1_5X8:197	case MEDIA_BUS_FMT_VYUY8_1_5X8:198	case MEDIA_BUS_FMT_YUYV8_1_5X8:199	case MEDIA_BUS_FMT_YVYU8_1_5X8:200	case MEDIA_BUS_FMT_UYVY8_2X8:201	case MEDIA_BUS_FMT_VYUY8_2X8:202	case MEDIA_BUS_FMT_YUYV8_2X8:203	case MEDIA_BUS_FMT_YVYU8_2X8:204	case MEDIA_BUS_FMT_Y10_1X10:205	case MEDIA_BUS_FMT_UYVY10_2X10:206	case MEDIA_BUS_FMT_VYUY10_2X10:207	case MEDIA_BUS_FMT_YUYV10_2X10:208	case MEDIA_BUS_FMT_YVYU10_2X10:209	case MEDIA_BUS_FMT_Y12_1X12:210	case MEDIA_BUS_FMT_UYVY12_2X12:211	case MEDIA_BUS_FMT_VYUY12_2X12:212	case MEDIA_BUS_FMT_YUYV12_2X12:213	case MEDIA_BUS_FMT_YVYU12_2X12:214	case MEDIA_BUS_FMT_UYVY8_1X16:215	case MEDIA_BUS_FMT_VYUY8_1X16:216	case MEDIA_BUS_FMT_YUYV8_1X16:217	case MEDIA_BUS_FMT_YVYU8_1X16:218	case MEDIA_BUS_FMT_YDYUYDYV8_1X16:219	case MEDIA_BUS_FMT_UYVY10_1X20:220	case MEDIA_BUS_FMT_VYUY10_1X20:221	case MEDIA_BUS_FMT_YUYV10_1X20:222	case MEDIA_BUS_FMT_YVYU10_1X20:223	case MEDIA_BUS_FMT_VUY8_1X24:224	case MEDIA_BUS_FMT_YUV8_1X24:225	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:226	case MEDIA_BUS_FMT_UYVY12_1X24:227	case MEDIA_BUS_FMT_VYUY12_1X24:228	case MEDIA_BUS_FMT_YUYV12_1X24:229	case MEDIA_BUS_FMT_YVYU12_1X24:230	case MEDIA_BUS_FMT_YUV10_1X30:231	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:232	case MEDIA_BUS_FMT_AYUV8_1X32:233	case MEDIA_BUS_FMT_UYYVYY12_0_5X36:234	case MEDIA_BUS_FMT_YUV12_1X36:235	case MEDIA_BUS_FMT_YUV16_1X48:236	case MEDIA_BUS_FMT_UYYVYY16_0_5X48:237	case MEDIA_BUS_FMT_JPEG_1X8:238	case MEDIA_BUS_FMT_AHSV8888_1X32:239	case MEDIA_BUS_FMT_SBGGR8_1X8:240	case MEDIA_BUS_FMT_SGBRG8_1X8:241	case MEDIA_BUS_FMT_SGRBG8_1X8:242	case MEDIA_BUS_FMT_SRGGB8_1X8:243	case MEDIA_BUS_FMT_SBGGR10_1X10:244	case MEDIA_BUS_FMT_SGBRG10_1X10:245	case MEDIA_BUS_FMT_SGRBG10_1X10:246	case MEDIA_BUS_FMT_SRGGB10_1X10:247	case MEDIA_BUS_FMT_SBGGR12_1X12:248	case MEDIA_BUS_FMT_SGBRG12_1X12:249	case MEDIA_BUS_FMT_SGRBG12_1X12:250	case MEDIA_BUS_FMT_SRGGB12_1X12:251	case MEDIA_BUS_FMT_SBGGR14_1X14:252	case MEDIA_BUS_FMT_SGBRG14_1X14:253	case MEDIA_BUS_FMT_SGRBG14_1X14:254	case MEDIA_BUS_FMT_SRGGB14_1X14:255	case MEDIA_BUS_FMT_SBGGR16_1X16:256	case MEDIA_BUS_FMT_SGBRG16_1X16:257	case MEDIA_BUS_FMT_SGRBG16_1X16:258	case MEDIA_BUS_FMT_SRGGB16_1X16:259		break;260	default:261		sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;262		break;263	}264	if (sdformat->format.field == V4L2_FIELD_ANY)265		sdformat->format.field = V4L2_FIELD_NONE;266 267	mutex_lock(&vmux->lock);268 269	/* Source pad mirrors active sink pad, no limitations on sink pads */270	if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)271		sdformat->format = *v4l2_subdev_state_get_format(sd_state,272								 vmux->active);273 274	*mbusformat = sdformat->format;275 276	/* Propagate the format from an active sink to source */277	if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))278		*source_mbusformat = sdformat->format;279 280	mutex_unlock(&vmux->lock);281 282	return 0;283}284 285static int video_mux_init_state(struct v4l2_subdev *sd,286				struct v4l2_subdev_state *sd_state)287{288	struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);289	struct v4l2_mbus_framefmt *mbusformat;290	unsigned int i;291 292	mutex_lock(&vmux->lock);293 294	for (i = 0; i < sd->entity.num_pads; i++) {295		mbusformat = v4l2_subdev_state_get_format(sd_state, i);296		*mbusformat = video_mux_format_mbus_default;297	}298 299	mutex_unlock(&vmux->lock);300 301	return 0;302}303 304static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {305	.get_fmt = v4l2_subdev_get_fmt,306	.set_fmt = video_mux_set_format,307};308 309static const struct v4l2_subdev_ops video_mux_subdev_ops = {310	.pad = &video_mux_pad_ops,311	.video = &video_mux_subdev_video_ops,312};313 314static const struct v4l2_subdev_internal_ops video_mux_internal_ops = {315	.init_state = video_mux_init_state,316};317 318static int video_mux_notify_bound(struct v4l2_async_notifier *notifier,319				  struct v4l2_subdev *sd,320				  struct v4l2_async_connection *asd)321{322	struct video_mux *vmux = notifier_to_video_mux(notifier);323 324	return v4l2_create_fwnode_links(sd, &vmux->subdev);325}326 327static const struct v4l2_async_notifier_operations video_mux_notify_ops = {328	.bound = video_mux_notify_bound,329};330 331static int video_mux_async_register(struct video_mux *vmux,332				    unsigned int num_input_pads)333{334	unsigned int i;335	int ret;336 337	v4l2_async_subdev_nf_init(&vmux->notifier, &vmux->subdev);338 339	for (i = 0; i < num_input_pads; i++) {340		struct v4l2_async_connection *asd;341		struct fwnode_handle *ep, *remote_ep;342 343		ep = fwnode_graph_get_endpoint_by_id(344			dev_fwnode(vmux->subdev.dev), i, 0,345			FWNODE_GRAPH_ENDPOINT_NEXT);346		if (!ep)347			continue;348 349		/* Skip dangling endpoints for backwards compatibility */350		remote_ep = fwnode_graph_get_remote_endpoint(ep);351		if (!remote_ep) {352			fwnode_handle_put(ep);353			continue;354		}355		fwnode_handle_put(remote_ep);356 357		asd = v4l2_async_nf_add_fwnode_remote(&vmux->notifier, ep,358						      struct v4l2_async_connection);359 360		fwnode_handle_put(ep);361 362		if (IS_ERR(asd)) {363			ret = PTR_ERR(asd);364			/* OK if asd already exists */365			if (ret != -EEXIST)366				goto err_nf_cleanup;367		}368	}369 370	vmux->notifier.ops = &video_mux_notify_ops;371 372	ret = v4l2_async_nf_register(&vmux->notifier);373	if (ret)374		goto err_nf_cleanup;375 376	ret = v4l2_async_register_subdev(&vmux->subdev);377	if (ret)378		goto err_nf_unregister;379 380	return 0;381 382err_nf_unregister:383	v4l2_async_nf_unregister(&vmux->notifier);384err_nf_cleanup:385	v4l2_async_nf_cleanup(&vmux->notifier);386	return ret;387}388 389static int video_mux_probe(struct platform_device *pdev)390{391	struct device_node *np = pdev->dev.of_node;392	struct device *dev = &pdev->dev;393	struct device_node *ep;394	struct video_mux *vmux;395	unsigned int num_pads = 0;396	unsigned int i;397	int ret;398 399	vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);400	if (!vmux)401		return -ENOMEM;402 403	platform_set_drvdata(pdev, vmux);404 405	v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);406	vmux->subdev.internal_ops = &video_mux_internal_ops;407	snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);408	vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;409	vmux->subdev.dev = dev;410 411	/*412	 * The largest numbered port is the output port. It determines413	 * total number of pads.414	 */415	for_each_endpoint_of_node(np, ep) {416		struct of_endpoint endpoint;417 418		of_graph_parse_endpoint(ep, &endpoint);419		num_pads = max(num_pads, endpoint.port + 1);420	}421 422	if (num_pads < 2) {423		dev_err(dev, "Not enough ports %d\n", num_pads);424		return -EINVAL;425	}426 427	vmux->mux = devm_mux_control_get(dev, NULL);428	if (IS_ERR(vmux->mux)) {429		ret = PTR_ERR(vmux->mux);430		return dev_err_probe(dev, ret, "Failed to get mux\n");431	}432 433	mutex_init(&vmux->lock);434	vmux->active = -1;435	vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),436				  GFP_KERNEL);437	if (!vmux->pads)438		return -ENOMEM;439 440	for (i = 0; i < num_pads; i++)441		vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK442							 : MEDIA_PAD_FL_SOURCE;443 444	vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;445	ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,446				     vmux->pads);447	if (ret < 0)448		return ret;449 450	vmux->subdev.entity.ops = &video_mux_ops;451 452	ret = v4l2_subdev_init_finalize(&vmux->subdev);453	if (ret < 0)454		goto err_entity_cleanup;455 456	ret = video_mux_async_register(vmux, num_pads - 1);457	if (ret)458		goto err_subdev_cleanup;459 460	return 0;461 462err_subdev_cleanup:463	v4l2_subdev_cleanup(&vmux->subdev);464err_entity_cleanup:465	media_entity_cleanup(&vmux->subdev.entity);466	return ret;467}468 469static void video_mux_remove(struct platform_device *pdev)470{471	struct video_mux *vmux = platform_get_drvdata(pdev);472	struct v4l2_subdev *sd = &vmux->subdev;473 474	v4l2_async_nf_unregister(&vmux->notifier);475	v4l2_async_nf_cleanup(&vmux->notifier);476	v4l2_async_unregister_subdev(sd);477	v4l2_subdev_cleanup(sd);478	media_entity_cleanup(&sd->entity);479}480 481static const struct of_device_id video_mux_dt_ids[] = {482	{ .compatible = "video-mux", },483	{ /* sentinel */ }484};485MODULE_DEVICE_TABLE(of, video_mux_dt_ids);486 487static struct platform_driver video_mux_driver = {488	.probe		= video_mux_probe,489	.remove_new	= video_mux_remove,490	.driver		= {491		.of_match_table = video_mux_dt_ids,492		.name = "video-mux",493	},494};495 496module_platform_driver(video_mux_driver);497 498MODULE_DESCRIPTION("video stream multiplexer");499MODULE_AUTHOR("Sascha Hauer, Pengutronix");500MODULE_AUTHOR("Philipp Zabel, Pengutronix");501MODULE_LICENSE("GPL");502