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-subdev.h>
  21
  22 struct video_mux {
  23         struct v4l2_subdev subdev;
  24         struct media_pad *pads;
  25         struct v4l2_mbus_framefmt *format_mbus;
  26         struct mux_control *mux;
  27         struct mutex lock;
  28         int active;
  29 };
  30
  31 static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
  32         .width = 1,
  33         .height = 1,
  34         .code = MEDIA_BUS_FMT_Y8_1X8,
  35         .field = V4L2_FIELD_NONE,
  36 };
  37
  38 static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
  39 {
  40         return container_of(sd, struct video_mux, subdev);
  41 }
  42
  43 static int video_mux_link_setup(struct media_entity *entity,
  44                                 const struct media_pad *local,
  45                                 const struct media_pad *remote, u32 flags)
  46 {
  47         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
  48         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
  49         u16 source_pad = entity->num_pads - 1;
  50         int ret = 0;
  51
  52         /*
  53          * The mux state is determined by the enabled sink pad link.
  54          * Enabling or disabling the source pad link has no effect.
  55          */
  56         if (local->flags & MEDIA_PAD_FL_SOURCE)
  57                 return 0;
  58
  59         dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
  60                 remote->entity->name, remote->index, local->entity->name,
  61                 local->index, flags & MEDIA_LNK_FL_ENABLED);
  62
  63         mutex_lock(&vmux->lock);
  64
  65         if (flags & MEDIA_LNK_FL_ENABLED) {
  66                 if (vmux->active == local->index)
  67                         goto out;
  68
  69                 if (vmux->active >= 0) {
  70                         ret = -EBUSY;
  71                         goto out;
  72                 }
  73
  74                 dev_dbg(sd->dev, "setting %d active\n", local->index);
  75                 ret = mux_control_try_select(vmux->mux, local->index);
  76                 if (ret < 0)
  77                         goto out;
  78                 vmux->active = local->index;
  79
  80                 /* Propagate the active format to the source */
  81                 vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
  82         } else {
  83                 if (vmux->active != local->index)
  84                         goto out;
  85
  86                 dev_dbg(sd->dev, "going inactive\n");
  87                 mux_control_deselect(vmux->mux);
  88                 vmux->active = -1;
  89         }
  90
  91 out:
  92         mutex_unlock(&vmux->lock);
  93         return ret;
  94 }
  95
  96 static const struct media_entity_operations video_mux_ops = {
  97         .link_setup = video_mux_link_setup,
  98         .link_validate = v4l2_subdev_link_validate,
  99 };
 100
 101 static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
 102 {
 103         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 104         struct v4l2_subdev *upstream_sd;
 105         struct media_pad *pad;
 106
 107         if (vmux->active == -1) {
 108                 dev_err(sd->dev, "Can not start streaming on inactive mux\n");
 109                 return -EINVAL;
 110         }
 111
 112         pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
 113         if (!pad) {
 114                 dev_err(sd->dev, "Failed to find remote source pad\n");
 115                 return -ENOLINK;
 116         }
 117
 118         if (!is_media_entity_v4l2_subdev(pad->entity)) {
 119                 dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
 120                 return -ENODEV;
 121         }
 122
 123         upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
 124
 125         return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
 126 }
 127
 128 static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
 129         .s_stream = video_mux_s_stream,
 130 };
 131
 132 static struct v4l2_mbus_framefmt *
 133 __video_mux_get_pad_format(struct v4l2_subdev *sd,
 134                            struct v4l2_subdev_pad_config *cfg,
 135                            unsigned int pad, u32 which)
 136 {
 137         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 138
 139         switch (which) {
 140         case V4L2_SUBDEV_FORMAT_TRY:
 141                 return v4l2_subdev_get_try_format(sd, cfg, pad);
 142         case V4L2_SUBDEV_FORMAT_ACTIVE:
 143                 return &vmux->format_mbus[pad];
 144         default:
 145                 return NULL;
 146         }
 147 }
 148
 149 static int video_mux_get_format(struct v4l2_subdev *sd,
 150                             struct v4l2_subdev_pad_config *cfg,
 151                             struct v4l2_subdev_format *sdformat)
 152 {
 153         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 154
 155         mutex_lock(&vmux->lock);
 156
 157         sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
 158                                                        sdformat->which);
 159
 160         mutex_unlock(&vmux->lock);
 161
 162         return 0;
 163 }
 164
 165 static int video_mux_set_format(struct v4l2_subdev *sd,
 166                             struct v4l2_subdev_pad_config *cfg,
 167                             struct v4l2_subdev_format *sdformat)
 168 {
 169         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 170         struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
 171         struct media_pad *pad = &vmux->pads[sdformat->pad];
 172         u16 source_pad = sd->entity.num_pads - 1;
 173
 174         mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
 175                                             sdformat->which);
 176         if (!mbusformat)
 177                 return -EINVAL;
 178
 179         source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
 180                                                        sdformat->which);
 181         if (!source_mbusformat)
 182                 return -EINVAL;
 183
 184         /* No size limitations except V4L2 compliance requirements */
 185         v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
 186                               &sdformat->format.height, 1, 65536, 0, 0);
 187
 188         /* All formats except LVDS and vendor specific formats are acceptable */
 189         switch (sdformat->format.code) {
 190         case MEDIA_BUS_FMT_RGB444_1X12:
 191         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
 192         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
 193         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
 194         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
 195         case MEDIA_BUS_FMT_RGB565_1X16:
 196         case MEDIA_BUS_FMT_BGR565_2X8_BE:
 197         case MEDIA_BUS_FMT_BGR565_2X8_LE:
 198         case MEDIA_BUS_FMT_RGB565_2X8_BE:
 199         case MEDIA_BUS_FMT_RGB565_2X8_LE:
 200         case MEDIA_BUS_FMT_RGB666_1X18:
 201         case MEDIA_BUS_FMT_RBG888_1X24:
 202         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 203         case MEDIA_BUS_FMT_BGR888_1X24:
 204         case MEDIA_BUS_FMT_GBR888_1X24:
 205         case MEDIA_BUS_FMT_RGB888_1X24:
 206         case MEDIA_BUS_FMT_RGB888_2X12_BE:
 207         case MEDIA_BUS_FMT_RGB888_2X12_LE:
 208         case MEDIA_BUS_FMT_ARGB8888_1X32:
 209         case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
 210         case MEDIA_BUS_FMT_RGB101010_1X30:
 211         case MEDIA_BUS_FMT_RGB121212_1X36:
 212         case MEDIA_BUS_FMT_RGB161616_1X48:
 213         case MEDIA_BUS_FMT_Y8_1X8:
 214         case MEDIA_BUS_FMT_UV8_1X8:
 215         case MEDIA_BUS_FMT_UYVY8_1_5X8:
 216         case MEDIA_BUS_FMT_VYUY8_1_5X8:
 217         case MEDIA_BUS_FMT_YUYV8_1_5X8:
 218         case MEDIA_BUS_FMT_YVYU8_1_5X8:
 219         case MEDIA_BUS_FMT_UYVY8_2X8:
 220         case MEDIA_BUS_FMT_VYUY8_2X8:
 221         case MEDIA_BUS_FMT_YUYV8_2X8:
 222         case MEDIA_BUS_FMT_YVYU8_2X8:
 223         case MEDIA_BUS_FMT_Y10_1X10:
 224         case MEDIA_BUS_FMT_UYVY10_2X10:
 225         case MEDIA_BUS_FMT_VYUY10_2X10:
 226         case MEDIA_BUS_FMT_YUYV10_2X10:
 227         case MEDIA_BUS_FMT_YVYU10_2X10:
 228         case MEDIA_BUS_FMT_Y12_1X12:
 229         case MEDIA_BUS_FMT_UYVY12_2X12:
 230         case MEDIA_BUS_FMT_VYUY12_2X12:
 231         case MEDIA_BUS_FMT_YUYV12_2X12:
 232         case MEDIA_BUS_FMT_YVYU12_2X12:
 233         case MEDIA_BUS_FMT_UYVY8_1X16:
 234         case MEDIA_BUS_FMT_VYUY8_1X16:
 235         case MEDIA_BUS_FMT_YUYV8_1X16:
 236         case MEDIA_BUS_FMT_YVYU8_1X16:
 237         case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
 238         case MEDIA_BUS_FMT_UYVY10_1X20:
 239         case MEDIA_BUS_FMT_VYUY10_1X20:
 240         case MEDIA_BUS_FMT_YUYV10_1X20:
 241         case MEDIA_BUS_FMT_YVYU10_1X20:
 242         case MEDIA_BUS_FMT_VUY8_1X24:
 243         case MEDIA_BUS_FMT_YUV8_1X24:
 244         case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
 245         case MEDIA_BUS_FMT_UYVY12_1X24:
 246         case MEDIA_BUS_FMT_VYUY12_1X24:
 247         case MEDIA_BUS_FMT_YUYV12_1X24:
 248         case MEDIA_BUS_FMT_YVYU12_1X24:
 249         case MEDIA_BUS_FMT_YUV10_1X30:
 250         case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
 251         case MEDIA_BUS_FMT_AYUV8_1X32:
 252         case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
 253         case MEDIA_BUS_FMT_YUV12_1X36:
 254         case MEDIA_BUS_FMT_YUV16_1X48:
 255         case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
 256         case MEDIA_BUS_FMT_JPEG_1X8:
 257         case MEDIA_BUS_FMT_AHSV8888_1X32:
 258         case MEDIA_BUS_FMT_SBGGR8_1X8:
 259         case MEDIA_BUS_FMT_SGBRG8_1X8:
 260         case MEDIA_BUS_FMT_SGRBG8_1X8:
 261         case MEDIA_BUS_FMT_SRGGB8_1X8:
 262         case MEDIA_BUS_FMT_SBGGR10_1X10:
 263         case MEDIA_BUS_FMT_SGBRG10_1X10:
 264         case MEDIA_BUS_FMT_SGRBG10_1X10:
 265         case MEDIA_BUS_FMT_SRGGB10_1X10:
 266         case MEDIA_BUS_FMT_SBGGR12_1X12:
 267         case MEDIA_BUS_FMT_SGBRG12_1X12:
 268         case MEDIA_BUS_FMT_SGRBG12_1X12:
 269         case MEDIA_BUS_FMT_SRGGB12_1X12:
 270         case MEDIA_BUS_FMT_SBGGR14_1X14:
 271         case MEDIA_BUS_FMT_SGBRG14_1X14:
 272         case MEDIA_BUS_FMT_SGRBG14_1X14:
 273         case MEDIA_BUS_FMT_SRGGB14_1X14:
 274         case MEDIA_BUS_FMT_SBGGR16_1X16:
 275         case MEDIA_BUS_FMT_SGBRG16_1X16:
 276         case MEDIA_BUS_FMT_SGRBG16_1X16:
 277         case MEDIA_BUS_FMT_SRGGB16_1X16:
 278                 break;
 279         default:
 280                 sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
 281                 break;
 282         }
 283         if (sdformat->format.field == V4L2_FIELD_ANY)
 284                 sdformat->format.field = V4L2_FIELD_NONE;
 285
 286         mutex_lock(&vmux->lock);
 287
 288         /* Source pad mirrors active sink pad, no limitations on sink pads */
 289         if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
 290                 sdformat->format = vmux->format_mbus[vmux->active];
 291
 292         *mbusformat = sdformat->format;
 293
 294         /* Propagate the format from an active sink to source */
 295         if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
 296                 *source_mbusformat = sdformat->format;
 297
 298         mutex_unlock(&vmux->lock);
 299
 300         return 0;
 301 }
 302
 303 static int video_mux_init_cfg(struct v4l2_subdev *sd,
 304                               struct v4l2_subdev_pad_config *cfg)
 305 {
 306         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 307         struct v4l2_mbus_framefmt *mbusformat;
 308         unsigned int i;
 309
 310         mutex_lock(&vmux->lock);
 311
 312         for (i = 0; i < sd->entity.num_pads; i++) {
 313                 mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
 314                 *mbusformat = video_mux_format_mbus_default;
 315         }
 316
 317         mutex_unlock(&vmux->lock);
 318
 319         return 0;
 320 }
 321
 322 static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
 323         .init_cfg = video_mux_init_cfg,
 324         .get_fmt = video_mux_get_format,
 325         .set_fmt = video_mux_set_format,
 326 };
 327
 328 static const struct v4l2_subdev_ops video_mux_subdev_ops = {
 329         .pad = &video_mux_pad_ops,
 330         .video = &video_mux_subdev_video_ops,
 331 };
 332
 333 static int video_mux_parse_endpoint(struct device *dev,
 334                                     struct v4l2_fwnode_endpoint *vep,
 335                                     struct v4l2_async_subdev *asd)
 336 {
 337         /*
 338          * it's not an error if remote is missing on a video-mux
 339          * input port, return -ENOTCONN to skip this endpoint with
 340          * no error.
 341          */
 342         return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 343 }
 344
 345 static int video_mux_async_register(struct video_mux *vmux,
 346                                     unsigned int num_input_pads)
 347 {
 348         unsigned int i, *ports;
 349         int ret;
 350
 351         ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL);
 352         if (!ports)
 353                 return -ENOMEM;
 354         for (i = 0; i < num_input_pads; i++)
 355                 ports[i] = i;
 356
 357         ret = v4l2_async_register_fwnode_subdev(
 358                 &vmux->subdev, sizeof(struct v4l2_async_subdev),
 359                 ports, num_input_pads, video_mux_parse_endpoint);
 360
 361         kfree(ports);
 362         return ret;
 363 }
 364
 365 static int video_mux_probe(struct platform_device *pdev)
 366 {
 367         struct device_node *np = pdev->dev.of_node;
 368         struct device *dev = &pdev->dev;
 369         struct device_node *ep;
 370         struct video_mux *vmux;
 371         unsigned int num_pads = 0;
 372         unsigned int i;
 373         int ret;
 374
 375         vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
 376         if (!vmux)
 377                 return -ENOMEM;
 378
 379         platform_set_drvdata(pdev, vmux);
 380
 381         v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
 382         snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);
 383         vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 384         vmux->subdev.dev = dev;
 385
 386         /*
 387          * The largest numbered port is the output port. It determines
 388          * total number of pads.
 389          */
 390         for_each_endpoint_of_node(np, ep) {
 391                 struct of_endpoint endpoint;
 392
 393                 of_graph_parse_endpoint(ep, &endpoint);
 394                 num_pads = max(num_pads, endpoint.port + 1);
 395         }
 396
 397         if (num_pads < 2) {
 398                 dev_err(dev, "Not enough ports %d\n", num_pads);
 399                 return -EINVAL;
 400         }
 401
 402         vmux->mux = devm_mux_control_get(dev, NULL);
 403         if (IS_ERR(vmux->mux)) {
 404                 ret = PTR_ERR(vmux->mux);
 405                 if (ret != -EPROBE_DEFER)
 406                         dev_err(dev, "Failed to get mux: %d\n", ret);
 407                 return ret;
 408         }
 409
 410         mutex_init(&vmux->lock);
 411         vmux->active = -1;
 412         vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
 413                                   GFP_KERNEL);
 414         if (!vmux->pads)
 415                 return -ENOMEM;
 416
 417         vmux->format_mbus = devm_kcalloc(dev, num_pads,
 418                                          sizeof(*vmux->format_mbus),
 419                                          GFP_KERNEL);
 420         if (!vmux->format_mbus)
 421                 return -ENOMEM;
 422
 423         for (i = 0; i < num_pads; i++) {
 424                 vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
 425                                                          : MEDIA_PAD_FL_SOURCE;
 426                 vmux->format_mbus[i] = video_mux_format_mbus_default;
 427         }
 428
 429         vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
 430         ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
 431                                      vmux->pads);
 432         if (ret < 0)
 433                 return ret;
 434
 435         vmux->subdev.entity.ops = &video_mux_ops;
 436
 437         return video_mux_async_register(vmux, num_pads - 1);
 438 }
 439
 440 static int video_mux_remove(struct platform_device *pdev)
 441 {
 442         struct video_mux *vmux = platform_get_drvdata(pdev);
 443         struct v4l2_subdev *sd = &vmux->subdev;
 444
 445         v4l2_async_unregister_subdev(sd);
 446         media_entity_cleanup(&sd->entity);
 447
 448         return 0;
 449 }
 450
 451 static const struct of_device_id video_mux_dt_ids[] = {
 452         { .compatible = "video-mux", },
 453         { /* sentinel */ }
 454 };
 455 MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
 456
 457 static struct platform_driver video_mux_driver = {
 458         .probe          = video_mux_probe,
 459         .remove         = video_mux_remove,
 460         .driver         = {
 461                 .of_match_table = video_mux_dt_ids,
 462                 .name = "video-mux",
 463         },
 464 };
 465
 466 module_platform_driver(video_mux_driver);
 467
 468 MODULE_DESCRIPTION("video stream multiplexer");
 469 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 470 MODULE_AUTHOR("Philipp Zabel, Pengutronix");
 471 MODULE_LICENSE("GPL");