drivers/media/platform/video-mux.c

   1 /*
   2  * video stream multiplexer controlled via mux control
   3  *
   4  * Copyright (C) 2013 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
   5  * Copyright (C) 2016-2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  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  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/err.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/mux/consumer.h>
  21 #include <linux/of.h>
  22 #include <linux/of_graph.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/slab.h>
  25 #include <media/v4l2-async.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-fwnode.h>
  28 #include <media/v4l2-subdev.h>
  29
  30 struct video_mux {
  31         struct v4l2_subdev subdev;
  32         struct media_pad *pads;
  33         struct v4l2_mbus_framefmt *format_mbus;
  34         struct mux_control *mux;
  35         struct mutex lock;
  36         int active;
  37 };
  38
  39 static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
  40         .width = 1,
  41         .height = 1,
  42         .code = MEDIA_BUS_FMT_Y8_1X8,
  43         .field = V4L2_FIELD_NONE,
  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 };
 108
 109 static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
 110 {
 111         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 112         struct v4l2_subdev *upstream_sd;
 113         struct media_pad *pad;
 114
 115         if (vmux->active == -1) {
 116                 dev_err(sd->dev, "Can not start streaming on inactive mux\n");
 117                 return -EINVAL;
 118         }
 119
 120         pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
 121         if (!pad) {
 122                 dev_err(sd->dev, "Failed to find remote source pad\n");
 123                 return -ENOLINK;
 124         }
 125
 126         if (!is_media_entity_v4l2_subdev(pad->entity)) {
 127                 dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
 128                 return -ENODEV;
 129         }
 130
 131         upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
 132
 133         return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
 134 }
 135
 136 static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
 137         .s_stream = video_mux_s_stream,
 138 };
 139
 140 static struct v4l2_mbus_framefmt *
 141 __video_mux_get_pad_format(struct v4l2_subdev *sd,
 142                            struct v4l2_subdev_pad_config *cfg,
 143                            unsigned int pad, u32 which)
 144 {
 145         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 146
 147         switch (which) {
 148         case V4L2_SUBDEV_FORMAT_TRY:
 149                 return v4l2_subdev_get_try_format(sd, cfg, pad);
 150         case V4L2_SUBDEV_FORMAT_ACTIVE:
 151                 return &vmux->format_mbus[pad];
 152         default:
 153                 return NULL;
 154         }
 155 }
 156
 157 static int video_mux_get_format(struct v4l2_subdev *sd,
 158                             struct v4l2_subdev_pad_config *cfg,
 159                             struct v4l2_subdev_format *sdformat)
 160 {
 161         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 162
 163         mutex_lock(&vmux->lock);
 164
 165         sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
 166                                                        sdformat->which);
 167
 168         mutex_unlock(&vmux->lock);
 169
 170         return 0;
 171 }
 172
 173 static int video_mux_set_format(struct v4l2_subdev *sd,
 174                             struct v4l2_subdev_pad_config *cfg,
 175                             struct v4l2_subdev_format *sdformat)
 176 {
 177         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 178         struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
 179         struct media_pad *pad = &vmux->pads[sdformat->pad];
 180         u16 source_pad = sd->entity.num_pads - 1;
 181
 182         mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
 183                                             sdformat->which);
 184         if (!mbusformat)
 185                 return -EINVAL;
 186
 187         source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
 188                                                        sdformat->which);
 189         if (!source_mbusformat)
 190                 return -EINVAL;
 191
 192         /* No size limitations except V4L2 compliance requirements */
 193         v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
 194                               &sdformat->format.height, 1, 65536, 0, 0);
 195
 196         /* All formats except LVDS and vendor specific formats are acceptable */
 197         switch (sdformat->format.code) {
 198         case MEDIA_BUS_FMT_RGB444_1X12:
 199         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
 200         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
 201         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
 202         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
 203         case MEDIA_BUS_FMT_RGB565_1X16:
 204         case MEDIA_BUS_FMT_BGR565_2X8_BE:
 205         case MEDIA_BUS_FMT_BGR565_2X8_LE:
 206         case MEDIA_BUS_FMT_RGB565_2X8_BE:
 207         case MEDIA_BUS_FMT_RGB565_2X8_LE:
 208         case MEDIA_BUS_FMT_RGB666_1X18:
 209         case MEDIA_BUS_FMT_RBG888_1X24:
 210         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 211         case MEDIA_BUS_FMT_BGR888_1X24:
 212         case MEDIA_BUS_FMT_GBR888_1X24:
 213         case MEDIA_BUS_FMT_RGB888_1X24:
 214         case MEDIA_BUS_FMT_RGB888_2X12_BE:
 215         case MEDIA_BUS_FMT_RGB888_2X12_LE:
 216         case MEDIA_BUS_FMT_ARGB8888_1X32:
 217         case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
 218         case MEDIA_BUS_FMT_RGB101010_1X30:
 219         case MEDIA_BUS_FMT_RGB121212_1X36:
 220         case MEDIA_BUS_FMT_RGB161616_1X48:
 221         case MEDIA_BUS_FMT_Y8_1X8:
 222         case MEDIA_BUS_FMT_UV8_1X8:
 223         case MEDIA_BUS_FMT_UYVY8_1_5X8:
 224         case MEDIA_BUS_FMT_VYUY8_1_5X8:
 225         case MEDIA_BUS_FMT_YUYV8_1_5X8:
 226         case MEDIA_BUS_FMT_YVYU8_1_5X8:
 227         case MEDIA_BUS_FMT_UYVY8_2X8:
 228         case MEDIA_BUS_FMT_VYUY8_2X8:
 229         case MEDIA_BUS_FMT_YUYV8_2X8:
 230         case MEDIA_BUS_FMT_YVYU8_2X8:
 231         case MEDIA_BUS_FMT_Y10_1X10:
 232         case MEDIA_BUS_FMT_UYVY10_2X10:
 233         case MEDIA_BUS_FMT_VYUY10_2X10:
 234         case MEDIA_BUS_FMT_YUYV10_2X10:
 235         case MEDIA_BUS_FMT_YVYU10_2X10:
 236         case MEDIA_BUS_FMT_Y12_1X12:
 237         case MEDIA_BUS_FMT_UYVY12_2X12:
 238         case MEDIA_BUS_FMT_VYUY12_2X12:
 239         case MEDIA_BUS_FMT_YUYV12_2X12:
 240         case MEDIA_BUS_FMT_YVYU12_2X12:
 241         case MEDIA_BUS_FMT_UYVY8_1X16:
 242         case MEDIA_BUS_FMT_VYUY8_1X16:
 243         case MEDIA_BUS_FMT_YUYV8_1X16:
 244         case MEDIA_BUS_FMT_YVYU8_1X16:
 245         case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
 246         case MEDIA_BUS_FMT_UYVY10_1X20:
 247         case MEDIA_BUS_FMT_VYUY10_1X20:
 248         case MEDIA_BUS_FMT_YUYV10_1X20:
 249         case MEDIA_BUS_FMT_YVYU10_1X20:
 250         case MEDIA_BUS_FMT_VUY8_1X24:
 251         case MEDIA_BUS_FMT_YUV8_1X24:
 252         case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
 253         case MEDIA_BUS_FMT_UYVY12_1X24:
 254         case MEDIA_BUS_FMT_VYUY12_1X24:
 255         case MEDIA_BUS_FMT_YUYV12_1X24:
 256         case MEDIA_BUS_FMT_YVYU12_1X24:
 257         case MEDIA_BUS_FMT_YUV10_1X30:
 258         case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
 259         case MEDIA_BUS_FMT_AYUV8_1X32:
 260         case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
 261         case MEDIA_BUS_FMT_YUV12_1X36:
 262         case MEDIA_BUS_FMT_YUV16_1X48:
 263         case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
 264         case MEDIA_BUS_FMT_JPEG_1X8:
 265         case MEDIA_BUS_FMT_AHSV8888_1X32:
 266         case MEDIA_BUS_FMT_SBGGR8_1X8:
 267         case MEDIA_BUS_FMT_SGBRG8_1X8:
 268         case MEDIA_BUS_FMT_SGRBG8_1X8:
 269         case MEDIA_BUS_FMT_SRGGB8_1X8:
 270         case MEDIA_BUS_FMT_SBGGR10_1X10:
 271         case MEDIA_BUS_FMT_SGBRG10_1X10:
 272         case MEDIA_BUS_FMT_SGRBG10_1X10:
 273         case MEDIA_BUS_FMT_SRGGB10_1X10:
 274         case MEDIA_BUS_FMT_SBGGR12_1X12:
 275         case MEDIA_BUS_FMT_SGBRG12_1X12:
 276         case MEDIA_BUS_FMT_SGRBG12_1X12:
 277         case MEDIA_BUS_FMT_SRGGB12_1X12:
 278         case MEDIA_BUS_FMT_SBGGR14_1X14:
 279         case MEDIA_BUS_FMT_SGBRG14_1X14:
 280         case MEDIA_BUS_FMT_SGRBG14_1X14:
 281         case MEDIA_BUS_FMT_SRGGB14_1X14:
 282         case MEDIA_BUS_FMT_SBGGR16_1X16:
 283         case MEDIA_BUS_FMT_SGBRG16_1X16:
 284         case MEDIA_BUS_FMT_SGRBG16_1X16:
 285         case MEDIA_BUS_FMT_SRGGB16_1X16:
 286                 break;
 287         default:
 288                 sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
 289                 break;
 290         }
 291         if (sdformat->format.field == V4L2_FIELD_ANY)
 292                 sdformat->format.field = V4L2_FIELD_NONE;
 293
 294         mutex_lock(&vmux->lock);
 295
 296         /* Source pad mirrors active sink pad, no limitations on sink pads */
 297         if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
 298                 sdformat->format = vmux->format_mbus[vmux->active];
 299
 300         *mbusformat = sdformat->format;
 301
 302         /* Propagate the format from an active sink to source */
 303         if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
 304                 *source_mbusformat = sdformat->format;
 305
 306         mutex_unlock(&vmux->lock);
 307
 308         return 0;
 309 }
 310
 311 static int video_mux_init_cfg(struct v4l2_subdev *sd,
 312                               struct v4l2_subdev_pad_config *cfg)
 313 {
 314         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 315         struct v4l2_mbus_framefmt *mbusformat;
 316         unsigned int i;
 317
 318         mutex_lock(&vmux->lock);
 319
 320         for (i = 0; i < sd->entity.num_pads; i++) {
 321                 mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
 322                 *mbusformat = video_mux_format_mbus_default;
 323         }
 324
 325         mutex_unlock(&vmux->lock);
 326
 327         return 0;
 328 }
 329
 330 static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
 331         .init_cfg = video_mux_init_cfg,
 332         .get_fmt = video_mux_get_format,
 333         .set_fmt = video_mux_set_format,
 334 };
 335
 336 static const struct v4l2_subdev_ops video_mux_subdev_ops = {
 337         .pad = &video_mux_pad_ops,
 338         .video = &video_mux_subdev_video_ops,
 339 };
 340
 341 static int video_mux_parse_endpoint(struct device *dev,
 342                                     struct v4l2_fwnode_endpoint *vep,
 343                                     struct v4l2_async_subdev *asd)
 344 {
 345         /*
 346          * it's not an error if remote is missing on a video-mux
 347          * input port, return -ENOTCONN to skip this endpoint with
 348          * no error.
 349          */
 350         return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
 351 }
 352
 353 static int video_mux_async_register(struct video_mux *vmux,
 354                                     unsigned int num_input_pads)
 355 {
 356         unsigned int i, *ports;
 357         int ret;
 358
 359         ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL);
 360         if (!ports)
 361                 return -ENOMEM;
 362         for (i = 0; i < num_input_pads; i++)
 363                 ports[i] = i;
 364
 365         ret = v4l2_async_register_fwnode_subdev(
 366                 &vmux->subdev, sizeof(struct v4l2_async_subdev),
 367                 ports, num_input_pads, video_mux_parse_endpoint);
 368
 369         kfree(ports);
 370         return ret;
 371 }
 372
 373 static int video_mux_probe(struct platform_device *pdev)
 374 {
 375         struct device_node *np = pdev->dev.of_node;
 376         struct device *dev = &pdev->dev;
 377         struct device_node *ep;
 378         struct video_mux *vmux;
 379         unsigned int num_pads = 0;
 380         unsigned int i;
 381         int ret;
 382
 383         vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
 384         if (!vmux)
 385                 return -ENOMEM;
 386
 387         platform_set_drvdata(pdev, vmux);
 388
 389         v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
 390         snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%pOFn", np);
 391         vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 392         vmux->subdev.dev = dev;
 393
 394         /*
 395          * The largest numbered port is the output port. It determines
 396          * total number of pads.
 397          */
 398         for_each_endpoint_of_node(np, ep) {
 399                 struct of_endpoint endpoint;
 400
 401                 of_graph_parse_endpoint(ep, &endpoint);
 402                 num_pads = max(num_pads, endpoint.port + 1);
 403         }
 404
 405         if (num_pads < 2) {
 406                 dev_err(dev, "Not enough ports %d\n", num_pads);
 407                 return -EINVAL;
 408         }
 409
 410         vmux->mux = devm_mux_control_get(dev, NULL);
 411         if (IS_ERR(vmux->mux)) {
 412                 ret = PTR_ERR(vmux->mux);
 413                 if (ret != -EPROBE_DEFER)
 414                         dev_err(dev, "Failed to get mux: %d\n", ret);
 415                 return ret;
 416         }
 417
 418         mutex_init(&vmux->lock);
 419         vmux->active = -1;
 420         vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
 421                                   GFP_KERNEL);
 422         vmux->format_mbus = devm_kcalloc(dev, num_pads,
 423                                          sizeof(*vmux->format_mbus),
 424                                          GFP_KERNEL);
 425
 426         for (i = 0; i < num_pads; i++) {
 427                 vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
 428                                                          : MEDIA_PAD_FL_SOURCE;
 429                 vmux->format_mbus[i] = video_mux_format_mbus_default;
 430         }
 431
 432         vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
 433         ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
 434                                      vmux->pads);
 435         if (ret < 0)
 436                 return ret;
 437
 438         vmux->subdev.entity.ops = &video_mux_ops;
 439
 440         return video_mux_async_register(vmux, num_pads - 1);
 441 }
 442
 443 static int video_mux_remove(struct platform_device *pdev)
 444 {
 445         struct video_mux *vmux = platform_get_drvdata(pdev);
 446         struct v4l2_subdev *sd = &vmux->subdev;
 447
 448         v4l2_async_unregister_subdev(sd);
 449         media_entity_cleanup(&sd->entity);
 450
 451         return 0;
 452 }
 453
 454 static const struct of_device_id video_mux_dt_ids[] = {
 455         { .compatible = "video-mux", },
 456         { /* sentinel */ }
 457 };
 458 MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
 459
 460 static struct platform_driver video_mux_driver = {
 461         .probe          = video_mux_probe,
 462         .remove         = video_mux_remove,
 463         .driver         = {
 464                 .of_match_table = video_mux_dt_ids,
 465                 .name = "video-mux",
 466         },
 467 };
 468
 469 module_platform_driver(video_mux_driver);
 470
 471 MODULE_DESCRIPTION("video stream multiplexer");
 472 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 473 MODULE_AUTHOR("Philipp Zabel, Pengutronix");
 474 MODULE_LICENSE("GPL");