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 <media/v4l2-async.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-subdev.h>
  27
  28 struct video_mux {
  29         struct v4l2_subdev subdev;
  30         struct media_pad *pads;
  31         struct v4l2_mbus_framefmt *format_mbus;
  32         struct mux_control *mux;
  33         struct mutex lock;
  34         int active;
  35 };
  36
  37 static const struct v4l2_mbus_framefmt video_mux_format_mbus_default = {
  38         .width = 1,
  39         .height = 1,
  40         .code = MEDIA_BUS_FMT_Y8_1X8,
  41         .field = V4L2_FIELD_NONE,
  42 };
  43
  44 static inline struct video_mux *v4l2_subdev_to_video_mux(struct v4l2_subdev *sd)
  45 {
  46         return container_of(sd, struct video_mux, subdev);
  47 }
  48
  49 static int video_mux_link_setup(struct media_entity *entity,
  50                                 const struct media_pad *local,
  51                                 const struct media_pad *remote, u32 flags)
  52 {
  53         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
  54         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
  55         u16 source_pad = entity->num_pads - 1;
  56         int ret = 0;
  57
  58         /*
  59          * The mux state is determined by the enabled sink pad link.
  60          * Enabling or disabling the source pad link has no effect.
  61          */
  62         if (local->flags & MEDIA_PAD_FL_SOURCE)
  63                 return 0;
  64
  65         dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
  66                 remote->entity->name, remote->index, local->entity->name,
  67                 local->index, flags & MEDIA_LNK_FL_ENABLED);
  68
  69         mutex_lock(&vmux->lock);
  70
  71         if (flags & MEDIA_LNK_FL_ENABLED) {
  72                 if (vmux->active == local->index)
  73                         goto out;
  74
  75                 if (vmux->active >= 0) {
  76                         ret = -EBUSY;
  77                         goto out;
  78                 }
  79
  80                 dev_dbg(sd->dev, "setting %d active\n", local->index);
  81                 ret = mux_control_try_select(vmux->mux, local->index);
  82                 if (ret < 0)
  83                         goto out;
  84                 vmux->active = local->index;
  85
  86                 /* Propagate the active format to the source */
  87                 vmux->format_mbus[source_pad] = vmux->format_mbus[vmux->active];
  88         } else {
  89                 if (vmux->active != local->index)
  90                         goto out;
  91
  92                 dev_dbg(sd->dev, "going inactive\n");
  93                 mux_control_deselect(vmux->mux);
  94                 vmux->active = -1;
  95         }
  96
  97 out:
  98         mutex_unlock(&vmux->lock);
  99         return ret;
 100 }
 101
 102 static const struct media_entity_operations video_mux_ops = {
 103         .link_setup = video_mux_link_setup,
 104         .link_validate = v4l2_subdev_link_validate,
 105 };
 106
 107 static int video_mux_s_stream(struct v4l2_subdev *sd, int enable)
 108 {
 109         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 110         struct v4l2_subdev *upstream_sd;
 111         struct media_pad *pad;
 112
 113         if (vmux->active == -1) {
 114                 dev_err(sd->dev, "Can not start streaming on inactive mux\n");
 115                 return -EINVAL;
 116         }
 117
 118         pad = media_entity_remote_pad(&sd->entity.pads[vmux->active]);
 119         if (!pad) {
 120                 dev_err(sd->dev, "Failed to find remote source pad\n");
 121                 return -ENOLINK;
 122         }
 123
 124         if (!is_media_entity_v4l2_subdev(pad->entity)) {
 125                 dev_err(sd->dev, "Upstream entity is not a v4l2 subdev\n");
 126                 return -ENODEV;
 127         }
 128
 129         upstream_sd = media_entity_to_v4l2_subdev(pad->entity);
 130
 131         return v4l2_subdev_call(upstream_sd, video, s_stream, enable);
 132 }
 133
 134 static const struct v4l2_subdev_video_ops video_mux_subdev_video_ops = {
 135         .s_stream = video_mux_s_stream,
 136 };
 137
 138 static struct v4l2_mbus_framefmt *
 139 __video_mux_get_pad_format(struct v4l2_subdev *sd,
 140                            struct v4l2_subdev_pad_config *cfg,
 141                            unsigned int pad, u32 which)
 142 {
 143         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 144
 145         switch (which) {
 146         case V4L2_SUBDEV_FORMAT_TRY:
 147                 return v4l2_subdev_get_try_format(sd, cfg, pad);
 148         case V4L2_SUBDEV_FORMAT_ACTIVE:
 149                 return &vmux->format_mbus[pad];
 150         default:
 151                 return NULL;
 152         }
 153 }
 154
 155 static int video_mux_get_format(struct v4l2_subdev *sd,
 156                             struct v4l2_subdev_pad_config *cfg,
 157                             struct v4l2_subdev_format *sdformat)
 158 {
 159         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 160
 161         mutex_lock(&vmux->lock);
 162
 163         sdformat->format = *__video_mux_get_pad_format(sd, cfg, sdformat->pad,
 164                                                        sdformat->which);
 165
 166         mutex_unlock(&vmux->lock);
 167
 168         return 0;
 169 }
 170
 171 static int video_mux_set_format(struct v4l2_subdev *sd,
 172                             struct v4l2_subdev_pad_config *cfg,
 173                             struct v4l2_subdev_format *sdformat)
 174 {
 175         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 176         struct v4l2_mbus_framefmt *mbusformat, *source_mbusformat;
 177         struct media_pad *pad = &vmux->pads[sdformat->pad];
 178         u16 source_pad = sd->entity.num_pads - 1;
 179
 180         mbusformat = __video_mux_get_pad_format(sd, cfg, sdformat->pad,
 181                                             sdformat->which);
 182         if (!mbusformat)
 183                 return -EINVAL;
 184
 185         source_mbusformat = __video_mux_get_pad_format(sd, cfg, source_pad,
 186                                                        sdformat->which);
 187         if (!source_mbusformat)
 188                 return -EINVAL;
 189
 190         /* No size limitations except V4L2 compliance requirements */
 191         v4l_bound_align_image(&sdformat->format.width, 1, 65536, 0,
 192                               &sdformat->format.height, 1, 65536, 0, 0);
 193
 194         /* All formats except LVDS and vendor specific formats are acceptable */
 195         switch (sdformat->format.code) {
 196         case MEDIA_BUS_FMT_RGB444_1X12:
 197         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
 198         case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
 199         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
 200         case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
 201         case MEDIA_BUS_FMT_RGB565_1X16:
 202         case MEDIA_BUS_FMT_BGR565_2X8_BE:
 203         case MEDIA_BUS_FMT_BGR565_2X8_LE:
 204         case MEDIA_BUS_FMT_RGB565_2X8_BE:
 205         case MEDIA_BUS_FMT_RGB565_2X8_LE:
 206         case MEDIA_BUS_FMT_RGB666_1X18:
 207         case MEDIA_BUS_FMT_RBG888_1X24:
 208         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 209         case MEDIA_BUS_FMT_BGR888_1X24:
 210         case MEDIA_BUS_FMT_GBR888_1X24:
 211         case MEDIA_BUS_FMT_RGB888_1X24:
 212         case MEDIA_BUS_FMT_RGB888_2X12_BE:
 213         case MEDIA_BUS_FMT_RGB888_2X12_LE:
 214         case MEDIA_BUS_FMT_ARGB8888_1X32:
 215         case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
 216         case MEDIA_BUS_FMT_RGB101010_1X30:
 217         case MEDIA_BUS_FMT_RGB121212_1X36:
 218         case MEDIA_BUS_FMT_RGB161616_1X48:
 219         case MEDIA_BUS_FMT_Y8_1X8:
 220         case MEDIA_BUS_FMT_UV8_1X8:
 221         case MEDIA_BUS_FMT_UYVY8_1_5X8:
 222         case MEDIA_BUS_FMT_VYUY8_1_5X8:
 223         case MEDIA_BUS_FMT_YUYV8_1_5X8:
 224         case MEDIA_BUS_FMT_YVYU8_1_5X8:
 225         case MEDIA_BUS_FMT_UYVY8_2X8:
 226         case MEDIA_BUS_FMT_VYUY8_2X8:
 227         case MEDIA_BUS_FMT_YUYV8_2X8:
 228         case MEDIA_BUS_FMT_YVYU8_2X8:
 229         case MEDIA_BUS_FMT_Y10_1X10:
 230         case MEDIA_BUS_FMT_UYVY10_2X10:
 231         case MEDIA_BUS_FMT_VYUY10_2X10:
 232         case MEDIA_BUS_FMT_YUYV10_2X10:
 233         case MEDIA_BUS_FMT_YVYU10_2X10:
 234         case MEDIA_BUS_FMT_Y12_1X12:
 235         case MEDIA_BUS_FMT_UYVY12_2X12:
 236         case MEDIA_BUS_FMT_VYUY12_2X12:
 237         case MEDIA_BUS_FMT_YUYV12_2X12:
 238         case MEDIA_BUS_FMT_YVYU12_2X12:
 239         case MEDIA_BUS_FMT_UYVY8_1X16:
 240         case MEDIA_BUS_FMT_VYUY8_1X16:
 241         case MEDIA_BUS_FMT_YUYV8_1X16:
 242         case MEDIA_BUS_FMT_YVYU8_1X16:
 243         case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
 244         case MEDIA_BUS_FMT_UYVY10_1X20:
 245         case MEDIA_BUS_FMT_VYUY10_1X20:
 246         case MEDIA_BUS_FMT_YUYV10_1X20:
 247         case MEDIA_BUS_FMT_YVYU10_1X20:
 248         case MEDIA_BUS_FMT_VUY8_1X24:
 249         case MEDIA_BUS_FMT_YUV8_1X24:
 250         case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
 251         case MEDIA_BUS_FMT_UYVY12_1X24:
 252         case MEDIA_BUS_FMT_VYUY12_1X24:
 253         case MEDIA_BUS_FMT_YUYV12_1X24:
 254         case MEDIA_BUS_FMT_YVYU12_1X24:
 255         case MEDIA_BUS_FMT_YUV10_1X30:
 256         case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
 257         case MEDIA_BUS_FMT_AYUV8_1X32:
 258         case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
 259         case MEDIA_BUS_FMT_YUV12_1X36:
 260         case MEDIA_BUS_FMT_YUV16_1X48:
 261         case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
 262         case MEDIA_BUS_FMT_JPEG_1X8:
 263         case MEDIA_BUS_FMT_AHSV8888_1X32:
 264                 break;
 265         default:
 266                 sdformat->format.code = MEDIA_BUS_FMT_Y8_1X8;
 267                 break;
 268         }
 269         if (sdformat->format.field == V4L2_FIELD_ANY)
 270                 sdformat->format.field = V4L2_FIELD_NONE;
 271
 272         mutex_lock(&vmux->lock);
 273
 274         /* Source pad mirrors active sink pad, no limitations on sink pads */
 275         if ((pad->flags & MEDIA_PAD_FL_SOURCE) && vmux->active >= 0)
 276                 sdformat->format = vmux->format_mbus[vmux->active];
 277
 278         *mbusformat = sdformat->format;
 279
 280         /* Propagate the format from an active sink to source */
 281         if ((pad->flags & MEDIA_PAD_FL_SINK) && (pad->index == vmux->active))
 282                 *source_mbusformat = sdformat->format;
 283
 284         mutex_unlock(&vmux->lock);
 285
 286         return 0;
 287 }
 288
 289 static int video_mux_init_cfg(struct v4l2_subdev *sd,
 290                               struct v4l2_subdev_pad_config *cfg)
 291 {
 292         struct video_mux *vmux = v4l2_subdev_to_video_mux(sd);
 293         struct v4l2_mbus_framefmt *mbusformat;
 294         unsigned int i;
 295
 296         mutex_lock(&vmux->lock);
 297
 298         for (i = 0; i < sd->entity.num_pads; i++) {
 299                 mbusformat = v4l2_subdev_get_try_format(sd, cfg, i);
 300                 *mbusformat = video_mux_format_mbus_default;
 301         }
 302
 303         mutex_unlock(&vmux->lock);
 304
 305         return 0;
 306 }
 307
 308 static const struct v4l2_subdev_pad_ops video_mux_pad_ops = {
 309         .init_cfg = video_mux_init_cfg,
 310         .get_fmt = video_mux_get_format,
 311         .set_fmt = video_mux_set_format,
 312 };
 313
 314 static const struct v4l2_subdev_ops video_mux_subdev_ops = {
 315         .pad = &video_mux_pad_ops,
 316         .video = &video_mux_subdev_video_ops,
 317 };
 318
 319 static int video_mux_probe(struct platform_device *pdev)
 320 {
 321         struct device_node *np = pdev->dev.of_node;
 322         struct device *dev = &pdev->dev;
 323         struct device_node *ep;
 324         struct video_mux *vmux;
 325         unsigned int num_pads = 0;
 326         unsigned int i;
 327         int ret;
 328
 329         vmux = devm_kzalloc(dev, sizeof(*vmux), GFP_KERNEL);
 330         if (!vmux)
 331                 return -ENOMEM;
 332
 333         platform_set_drvdata(pdev, vmux);
 334
 335         v4l2_subdev_init(&vmux->subdev, &video_mux_subdev_ops);
 336         snprintf(vmux->subdev.name, sizeof(vmux->subdev.name), "%s", np->name);
 337         vmux->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 338         vmux->subdev.dev = dev;
 339
 340         /*
 341          * The largest numbered port is the output port. It determines
 342          * total number of pads.
 343          */
 344         for_each_endpoint_of_node(np, ep) {
 345                 struct of_endpoint endpoint;
 346
 347                 of_graph_parse_endpoint(ep, &endpoint);
 348                 num_pads = max(num_pads, endpoint.port + 1);
 349         }
 350
 351         if (num_pads < 2) {
 352                 dev_err(dev, "Not enough ports %d\n", num_pads);
 353                 return -EINVAL;
 354         }
 355
 356         vmux->mux = devm_mux_control_get(dev, NULL);
 357         if (IS_ERR(vmux->mux)) {
 358                 ret = PTR_ERR(vmux->mux);
 359                 if (ret != -EPROBE_DEFER)
 360                         dev_err(dev, "Failed to get mux: %d\n", ret);
 361                 return ret;
 362         }
 363
 364         mutex_init(&vmux->lock);
 365         vmux->active = -1;
 366         vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
 367                                   GFP_KERNEL);
 368         vmux->format_mbus = devm_kcalloc(dev, num_pads,
 369                                          sizeof(*vmux->format_mbus),
 370                                          GFP_KERNEL);
 371
 372         for (i = 0; i < num_pads; i++) {
 373                 vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK
 374                                                          : MEDIA_PAD_FL_SOURCE;
 375                 vmux->format_mbus[i] = video_mux_format_mbus_default;
 376         }
 377
 378         vmux->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
 379         ret = media_entity_pads_init(&vmux->subdev.entity, num_pads,
 380                                      vmux->pads);
 381         if (ret < 0)
 382                 return ret;
 383
 384         vmux->subdev.entity.ops = &video_mux_ops;
 385
 386         return v4l2_async_register_subdev(&vmux->subdev);
 387 }
 388
 389 static int video_mux_remove(struct platform_device *pdev)
 390 {
 391         struct video_mux *vmux = platform_get_drvdata(pdev);
 392         struct v4l2_subdev *sd = &vmux->subdev;
 393
 394         v4l2_async_unregister_subdev(sd);
 395         media_entity_cleanup(&sd->entity);
 396
 397         return 0;
 398 }
 399
 400 static const struct of_device_id video_mux_dt_ids[] = {
 401         { .compatible = "video-mux", },
 402         { /* sentinel */ }
 403 };
 404 MODULE_DEVICE_TABLE(of, video_mux_dt_ids);
 405
 406 static struct platform_driver video_mux_driver = {
 407         .probe          = video_mux_probe,
 408         .remove         = video_mux_remove,
 409         .driver         = {
 410                 .of_match_table = video_mux_dt_ids,
 411                 .name = "video-mux",
 412         },
 413 };
 414
 415 module_platform_driver(video_mux_driver);
 416
 417 MODULE_DESCRIPTION("video stream multiplexer");
 418 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 419 MODULE_AUTHOR("Philipp Zabel, Pengutronix");
 420 MODULE_LICENSE("GPL");