drivers/media/platform/video-mux.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * video stream multiplexer controlled via mux control
   4  *
   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
  23 struct 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
  33 static 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
  40 static inline struct video_mux *
  41 notifier_to_video_mux(struct v4l2_async_notifier *n)
  42 {
  43         return container_of(n, struct video_mux, notifier);
  44 }
  45
  46 static 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
  51 static 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          * The mux state is determined by the enabled sink pad link.
  62          * Enabling or disabling the source pad link has no effect.
  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                 /* Propagate the active format to the source */
  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
  99 out:
 100         mutex_unlock(&vmux->lock);
 101         return ret;
 102 }
 103
 104 static 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
 110 static 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
 137 static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
 138         .s_stream = video_mux_s_stream,
 139 };
 140
 141 static struct v4l2_mbus_framefmt *
 142 __video_mux_get_pad_format(struct v4l2_subdev *sd,
 143                            struct v4l2_subdev_pad_config *cfg,
 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, cfg, pad);
 151         case V4L2_SUBDEV_FORMAT_ACTIVE:
 152                 return &vmux->format_mbus[pad];
 153         default:
 154                 return NULL;
 155         }
 156 }
 157
 158 static int video_mux_get_format(struct v4l2_subdev *sd,
 159                             struct v4l2_subdev_pad_config *cfg,
 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, cfg, sdformat->pad,
 167                                                        sdformat->which);
 168
 169         mutex_unlock(&vmux->lock);
 170
 171         return 0;
 172 }
 173
 174 static int video_mux_set_format(struct v4l2_subdev *sd,
 175                             struct v4l2_subdev_pad_config *cfg,
 176                             struct v4l2_subdev_format *sdformat)
 177 {
 178         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 179         struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
 180         struct media_pad *pad = &vmux->pads[sdformat->pad];
 181         u16 source_pad = sd->entity.num_pads - 1;
 182
 183         mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
 184                                             sdformat->which);
 185         if (!mbusformat)
 186                 return -EINVAL;
 187
 188         source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
 189                                                        sdformat->which);
 190         if (!source_mbusformat)
 191                 return -EINVAL;
 192
 193         /* No size limitations except V4L2 compliance requirements */
 194         v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
 195                               &sdformat->format.height, 1, 65536, 0, 0);
 196
 197         /* All formats except LVDS and vendor specific formats are acceptable */
 198         switch (sdformat->format.code) {
 199         case MEDIA_BUS_FMT_RGB444_1X12:
 200         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
 201         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
 202         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
 203         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
 204         case MEDIA_BUS_FMT_RGB565_1X16:
 205         case MEDIA_BUS_FMT_BGR565_2X8_BE:
 206         case MEDIA_BUS_FMT_BGR565_2X8_LE:
 207         case MEDIA_BUS_FMT_RGB565_2X8_BE:
 208         case MEDIA_BUS_FMT_RGB565_2X8_LE:
 209         case MEDIA_BUS_FMT_RGB666_1X18:
 210         case MEDIA_BUS_FMT_RBG888_1X24:
 211         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 212         case MEDIA_BUS_FMT_BGR888_1X24:
 213         case MEDIA_BUS_FMT_GBR888_1X24:
 214         case MEDIA_BUS_FMT_RGB888_1X24:
 215         case MEDIA_BUS_FMT_RGB888_2X12_BE:
 216         case MEDIA_BUS_FMT_RGB888_2X12_LE:
 217         case MEDIA_BUS_FMT_ARGB8888_1X32:
 218         case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
 219         case MEDIA_BUS_FMT_RGB101010_1X30:
 220         case MEDIA_BUS_FMT_RGB121212_1X36:
 221         case MEDIA_BUS_FMT_RGB161616_1X48:
 222         case MEDIA_BUS_FMT_Y8_1X8:
 223         case MEDIA_BUS_FMT_UV8_1X8:
 224         case MEDIA_BUS_FMT_UYVY8_1_5X8:
 225         case MEDIA_BUS_FMT_VYUY8_1_5X8:
 226         case MEDIA_BUS_FMT_YUYV8_1_5X8:
 227         case MEDIA_BUS_FMT_YVYU8_1_5X8:
 228         case MEDIA_BUS_FMT_UYVY8_2X8:
 229         case MEDIA_BUS_FMT_VYUY8_2X8:
 230         case MEDIA_BUS_FMT_YUYV8_2X8:
 231         case MEDIA_BUS_FMT_YVYU8_2X8:
 232         case MEDIA_BUS_FMT_Y10_1X10:
 233         case MEDIA_BUS_FMT_UYVY10_2X10:
 234         case MEDIA_BUS_FMT_VYUY10_2X10:
 235         case MEDIA_BUS_FMT_YUYV10_2X10:
 236         case MEDIA_BUS_FMT_YVYU10_2X10:
 237         case MEDIA_BUS_FMT_Y12_1X12:
 238         case MEDIA_BUS_FMT_UYVY12_2X12:
 239         case MEDIA_BUS_FMT_VYUY12_2X12:
 240         case MEDIA_BUS_FMT_YUYV12_2X12:
 241         case MEDIA_BUS_FMT_YVYU12_2X12:
 242         case MEDIA_BUS_FMT_UYVY8_1X16:
 243         case MEDIA_BUS_FMT_VYUY8_1X16:
 244         case MEDIA_BUS_FMT_YUYV8_1X16:
 245         case MEDIA_BUS_FMT_YVYU8_1X16:
 246         case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
 247         case MEDIA_BUS_FMT_UYVY10_1X20:
 248         case MEDIA_BUS_FMT_VYUY10_1X20:
 249         case MEDIA_BUS_FMT_YUYV10_1X20:
 250         case MEDIA_BUS_FMT_YVYU10_1X20:
 251         case MEDIA_BUS_FMT_VUY8_1X24:
 252         case MEDIA_BUS_FMT_YUV8_1X24:
 253         case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
 254         case MEDIA_BUS_FMT_UYVY12_1X24:
 255         case MEDIA_BUS_FMT_VYUY12_1X24:
 256         case MEDIA_BUS_FMT_YUYV12_1X24:
 257         case MEDIA_BUS_FMT_YVYU12_1X24:
 258         case MEDIA_BUS_FMT_YUV10_1X30:
 259         case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
 260         case MEDIA_BUS_FMT_AYUV8_1X32:
 261         case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
 262         case MEDIA_BUS_FMT_YUV12_1X36:
 263         case MEDIA_BUS_FMT_YUV16_1X48:
 264         case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
 265         case MEDIA_BUS_FMT_JPEG_1X8:
 266         case MEDIA_BUS_FMT_AHSV8888_1X32:
 267         case MEDIA_BUS_FMT_SBGGR8_1X8:
 268         case MEDIA_BUS_FMT_SGBRG8_1X8:
 269         case MEDIA_BUS_FMT_SGRBG8_1X8:
 270         case MEDIA_BUS_FMT_SRGGB8_1X8:
 271         case MEDIA_BUS_FMT_SBGGR10_1X10:
 272         case MEDIA_BUS_FMT_SGBRG10_1X10:
 273         case MEDIA_BUS_FMT_SGRBG10_1X10:
 274         case MEDIA_BUS_FMT_SRGGB10_1X10:
 275         case MEDIA_BUS_FMT_SBGGR12_1X12:
 276         case MEDIA_BUS_FMT_SGBRG12_1X12:
 277         case MEDIA_BUS_FMT_SGRBG12_1X12:
 278         case MEDIA_BUS_FMT_SRGGB12_1X12:
 279         case MEDIA_BUS_FMT_SBGGR14_1X14:
 280         case MEDIA_BUS_FMT_SGBRG14_1X14:
 281         case MEDIA_BUS_FMT_SGRBG14_1X14:
 282         case MEDIA_BUS_FMT_SRGGB14_1X14:
 283         case MEDIA_BUS_FMT_SBGGR16_1X16:
 284         case MEDIA_BUS_FMT_SGBRG16_1X16:
 285         case MEDIA_BUS_FMT_SGRBG16_1X16:
 286         case MEDIA_BUS_FMT_SRGGB16_1X16:
 287                 break;
 288         default:
 289                 sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
 290                 break;
 291         }
 292         if (sdformat->format.field == V4L2_FIELD_ANY)
 293                 sdformat->format.field = V4L2_FIELD_NONE;
 294
 295         mutex_lock(&vmux->lock);
 296
 297         /* Source pad mirrors active sink pad, no limitations on sink pads */
 298         if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
 299                 sdformat->format = vmux->format_mbus[vmux->active];
 300
 301         *mbusformat = sdformat->format;
 302
 303         /* Propagate the format from an active sink to source */
 304         if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
 305                 *source_mbusformat = sdformat->format;
 306
 307         mutex_unlock(&vmux->lock);
 308
 309         return 0;
 310 }
 311
 312 static int video_mux_init_cfg(struct v4l2_subdev *sd,
 313                               struct v4l2_subdev_pad_config *cfg)
 314 {
 315         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 316         struct v4l2_mbus_framefmt *mbusformat;
 317         unsigned int i;
 318
 319         mutex_lock(&vmux->lock);
 320
 321         for (i = 0; i < sd->entity.num_pads; i++) {
 322                 mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
 323                 *mbusformat = video_mux_format_mbus_default;
 324         }
 325
 326         mutex_unlock(&vmux->lock);
 327
 328         return 0;
 329 }
 330
 331 static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
 332         .init_cfg = video_mux_init_cfg,
 333         .get_fmt = video_mux_get_format,
 334         .set_fmt = video_mux_set_format,
 335 };
 336
 337 static const struct v4l2_subdev_ops video_mux_subdev_ops = {
 338         .pad = &video_mux_pad_ops,
 339         .video = &video_mux_subdev_video_ops,
 340 };
 341
 342 static int video_mux_notify_bound(struct v4l2_async_notifier *notifier,
 343                                   struct v4l2_subdev *sd,
 344                                   struct v4l2_async_subdev *asd)
 345 {
 346         struct video_mux *vmux = notifier_to_video_mux(notifier);
 347
 348         return v4l2_create_fwnode_links(sd, &vmux->subdev);
 349 }
 350
 351 static const struct v4l2_async_notifier_operations video_mux_notify_ops = {
 352         .bound = video_mux_notify_bound,
 353 };
 354
 355 static int video_mux_async_register(struct video_mux *vmux,
 356                                     unsigned int num_input_pads)
 357 {
 358         unsigned int i;
 359         int ret;
 360
 361         v4l2_async_notifier_init(&vmux->notifier);
 362
 363         for (i = 0; i < num_input_pads; i++) {
 364                 struct v4l2_async_subdev *asd;
 365                 struct fwnode_handle *ep;
 366
 367                 ep = fwnode_graph_get_endpoint_by_id(
 368                         dev_fwnode(vmux->subdev.dev), i, 0,
 369                         FWNODE_GRAPH_ENDPOINT_NEXT);
 370                 if (!ep)
 371                         continue;
 372
 373                 asd = kzalloc(sizeof(*asd), GFP_KERNEL);
 374                 if (!asd) {
 375                         fwnode_handle_put(ep);
 376                         return -ENOMEM;
 377                 }
 378
 379                 ret = v4l2_async_notifier_add_fwnode_remote_subdev(
 380                         &vmux->notifier, ep, asd);
 381
 382                 fwnode_handle_put(ep);
 383
 384                 if (ret) {
 385                         kfree(asd);
 386                         /* OK if asd already exists */
 387                         if (ret != -EEXIST)
 388                                 return ret;
 389                 }
 390         }
 391
 392         vmux->notifier.ops = &video_mux_notify_ops;
 393
 394         ret = v4l2_async_subdev_notifier_register(&vmux->subdev,
 395                                                   &vmux->notifier);
 396         if (ret)
 397                 return ret;
 398
 399         return v4l2_async_register_subdev(&vmux->subdev);
 400 }
 401
 402 static int video_mux_probe(struct platform_device *pdev)
 403 {
 404         struct device_node *np = pdev->dev.of_node;
 405         struct device *dev = &pdev->dev;
 406         struct device_node *ep;
 407         struct video_mux *vmux;
 408         unsigned int num_pads = 0;
 409         unsigned int i;
 410         int ret;
 411
 412         vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
 413         if (!vmux)
 414                 return -ENOMEM;
 415
 416         platform_set_drvdata(pdev, vmux);
 417
 418         v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
 419         snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);
 420         vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 421         vmux->subdev.dev = dev;
 422
 423         /*
 424          * The largest numbered port is the output port. It determines
 425          * total number of pads.
 426          */
 427         for_each_endpoint_of_node(np, ep) {
 428                 struct of_endpoint endpoint;
 429
 430                 of_graph_parse_endpoint(ep, &endpoint);
 431                 num_pads = max(num_pads, endpoint.port + 1);
 432         }
 433
 434         if (num_pads < 2) {
 435                 dev_err(dev, "Not enough ports %d\n", num_pads);
 436                 return -EINVAL;
 437         }
 438
 439         vmux->mux = devm_mux_control_get(dev, NULL);
 440         if (IS_ERR(vmux->mux)) {
 441                 ret = PTR_ERR(vmux->mux);
 442                 if (ret != -EPROBE_DEFER)
 443                         dev_err(dev, "Failed to get mux: %d\n", ret);
 444                 return ret;
 445         }
 446
 447         mutex_init(&vmux->lock);
 448         vmux->active = -1;
 449         vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
 450                                   GFP_KERNEL);
 451         if (!vmux->pads)
 452                 return -ENOMEM;
 453
 454         vmux->format_mbus = devm_kcalloc(dev, num_pads,
 455                                          sizeof(*vmux->format_mbus),
 456                                          GFP_KERNEL);
 457         if (!vmux->format_mbus)
 458                 return -ENOMEM;
 459
 460         for (i = 0; i < num_pads; i++) {
 461                 vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
 462                                                          : MEDIA_PAD_FL_SOURCE;
 463                 vmux->format_mbus[i] = video_mux_format_mbus_default;
 464         }
 465
 466         vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
 467         ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
 468                                      vmux->pads);
 469         if (ret < 0)
 470                 return ret;
 471
 472         vmux->subdev.entity.ops = &video_mux_ops;
 473
 474         ret = video_mux_async_register(vmux, num_pads - 1);
 475         if (ret) {
 476                 v4l2_async_notifier_unregister(&vmux->notifier);
 477                 v4l2_async_notifier_cleanup(&vmux->notifier);
 478         }
 479
 480         return ret;
 481 }
 482
 483 static int video_mux_remove(struct platform_device *pdev)
 484 {
 485         struct video_mux *vmux = platform_get_drvdata(pdev);
 486         struct v4l2_subdev *sd = &vmux->subdev;
 487
 488         v4l2_async_notifier_unregister(&vmux->notifier);
 489         v4l2_async_notifier_cleanup(&vmux->notifier);
 490         v4l2_async_unregister_subdev(sd);
 491         media_entity_cleanup(&sd->entity);
 492
 493         return 0;
 494 }
 495
 496 static const struct of_device_id video_mux_dt_ids[] = {
 497         { .compatible = "video-mux", },
 498         { /* sentinel */ }
 499 };
 500 MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
 501
 502 static struct platform_driver video_mux_driver = {
 503         .probe          = video_mux_probe,
 504         .remove         = video_mux_remove,
 505         .driver         = {
 506                 .of_match_table = video_mux_dt_ids,
 507                 .name = "video-mux",
 508         },
 509 };
 510
 511 module_platform_driver(video_mux_driver);
 512
 513 MODULE_DESCRIPTION("video stream multiplexer");
 514 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 515 MODULE_AUTHOR("Philipp Zabel, Pengutronix");
 516 MODULE_LICENSE("GPL");