drivers/media/platform/vimc/vimc-common.c

   1 /*
   2  * vimc-common.c Virtual Media Controller Driver
   3  *
   4  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  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
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20
  21 #include "vimc-common.h"
  22
  23 /*
  24  * NOTE: non-bayer formats need to come first (necessary for enum_mbus_code
  25  * in the scaler)
  26  */
  27 static const struct vimc_pix_map vimc_pix_map_list[] = {
  28         /* TODO: add all missing formats */
  29
  30         /* RGB formats */
  31         {
  32                 .code = MEDIA_BUS_FMT_BGR888_1X24,
  33                 .pixelformat = V4L2_PIX_FMT_BGR24,
  34                 .bpp = 3,
  35                 .bayer = false,
  36         },
  37         {
  38                 .code = MEDIA_BUS_FMT_RGB888_1X24,
  39                 .pixelformat = V4L2_PIX_FMT_RGB24,
  40                 .bpp = 3,
  41                 .bayer = false,
  42         },
  43         {
  44                 .code = MEDIA_BUS_FMT_ARGB8888_1X32,
  45                 .pixelformat = V4L2_PIX_FMT_ARGB32,
  46                 .bpp = 4,
  47                 .bayer = false,
  48         },
  49
  50         /* Bayer formats */
  51         {
  52                 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
  53                 .pixelformat = V4L2_PIX_FMT_SBGGR8,
  54                 .bpp = 1,
  55                 .bayer = true,
  56         },
  57         {
  58                 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
  59                 .pixelformat = V4L2_PIX_FMT_SGBRG8,
  60                 .bpp = 1,
  61                 .bayer = true,
  62         },
  63         {
  64                 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
  65                 .pixelformat = V4L2_PIX_FMT_SGRBG8,
  66                 .bpp = 1,
  67                 .bayer = true,
  68         },
  69         {
  70                 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
  71                 .pixelformat = V4L2_PIX_FMT_SRGGB8,
  72                 .bpp = 1,
  73                 .bayer = true,
  74         },
  75         {
  76                 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
  77                 .pixelformat = V4L2_PIX_FMT_SBGGR10,
  78                 .bpp = 2,
  79                 .bayer = true,
  80         },
  81         {
  82                 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
  83                 .pixelformat = V4L2_PIX_FMT_SGBRG10,
  84                 .bpp = 2,
  85                 .bayer = true,
  86         },
  87         {
  88                 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
  89                 .pixelformat = V4L2_PIX_FMT_SGRBG10,
  90                 .bpp = 2,
  91                 .bayer = true,
  92         },
  93         {
  94                 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
  95                 .pixelformat = V4L2_PIX_FMT_SRGGB10,
  96                 .bpp = 2,
  97                 .bayer = true,
  98         },
  99
 100         /* 10bit raw bayer a-law compressed to 8 bits */
 101         {
 102                 .code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
 103                 .pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
 104                 .bpp = 1,
 105                 .bayer = true,
 106         },
 107         {
 108                 .code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
 109                 .pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
 110                 .bpp = 1,
 111                 .bayer = true,
 112         },
 113         {
 114                 .code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
 115                 .pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
 116                 .bpp = 1,
 117                 .bayer = true,
 118         },
 119         {
 120                 .code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
 121                 .pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
 122                 .bpp = 1,
 123                 .bayer = true,
 124         },
 125
 126         /* 10bit raw bayer DPCM compressed to 8 bits */
 127         {
 128                 .code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
 129                 .pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
 130                 .bpp = 1,
 131                 .bayer = true,
 132         },
 133         {
 134                 .code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
 135                 .pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
 136                 .bpp = 1,
 137                 .bayer = true,
 138         },
 139         {
 140                 .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
 141                 .pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
 142                 .bpp = 1,
 143                 .bayer = true,
 144         },
 145         {
 146                 .code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
 147                 .pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
 148                 .bpp = 1,
 149                 .bayer = true,
 150         },
 151         {
 152                 .code = MEDIA_BUS_FMT_SBGGR12_1X12,
 153                 .pixelformat = V4L2_PIX_FMT_SBGGR12,
 154                 .bpp = 2,
 155                 .bayer = true,
 156         },
 157         {
 158                 .code = MEDIA_BUS_FMT_SGBRG12_1X12,
 159                 .pixelformat = V4L2_PIX_FMT_SGBRG12,
 160                 .bpp = 2,
 161                 .bayer = true,
 162         },
 163         {
 164                 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
 165                 .pixelformat = V4L2_PIX_FMT_SGRBG12,
 166                 .bpp = 2,
 167                 .bayer = true,
 168         },
 169         {
 170                 .code = MEDIA_BUS_FMT_SRGGB12_1X12,
 171                 .pixelformat = V4L2_PIX_FMT_SRGGB12,
 172                 .bpp = 2,
 173                 .bayer = true,
 174         },
 175 };
 176
 177 const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i)
 178 {
 179         if (i >= ARRAY_SIZE(vimc_pix_map_list))
 180                 return NULL;
 181
 182         return &vimc_pix_map_list[i];
 183 }
 184 EXPORT_SYMBOL_GPL(vimc_pix_map_by_index);
 185
 186 const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
 187 {
 188         unsigned int i;
 189
 190         for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
 191                 if (vimc_pix_map_list[i].code == code)
 192                         return &vimc_pix_map_list[i];
 193         }
 194         return NULL;
 195 }
 196 EXPORT_SYMBOL_GPL(vimc_pix_map_by_code);
 197
 198 const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat)
 199 {
 200         unsigned int i;
 201
 202         for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
 203                 if (vimc_pix_map_list[i].pixelformat == pixelformat)
 204                         return &vimc_pix_map_list[i];
 205         }
 206         return NULL;
 207 }
 208 EXPORT_SYMBOL_GPL(vimc_pix_map_by_pixelformat);
 209
 210 /* Helper function to allocate and initialize pads */
 211 struct media_pad *vimc_pads_init(u16 num_pads, const unsigned long *pads_flag)
 212 {
 213         struct media_pad *pads;
 214         unsigned int i;
 215
 216         /* Allocate memory for the pads */
 217         pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
 218         if (!pads)
 219                 return ERR_PTR(-ENOMEM);
 220
 221         /* Initialize the pads */
 222         for (i = 0; i < num_pads; i++) {
 223                 pads[i].index = i;
 224                 pads[i].flags = pads_flag[i];
 225         }
 226
 227         return pads;
 228 }
 229 EXPORT_SYMBOL_GPL(vimc_pads_init);
 230
 231 int vimc_pipeline_s_stream(struct media_entity *ent, int enable)
 232 {
 233         struct v4l2_subdev *sd;
 234         struct media_pad *pad;
 235         unsigned int i;
 236         int ret;
 237
 238         for (i = 0; i < ent->num_pads; i++) {
 239                 if (ent->pads[i].flags & MEDIA_PAD_FL_SOURCE)
 240                         continue;
 241
 242                 /* Start the stream in the subdevice direct connected */
 243                 pad = media_entity_remote_pad(&ent->pads[i]);
 244                 if (!pad)
 245                         continue;
 246
 247                 if (!is_media_entity_v4l2_subdev(pad->entity))
 248                         return -EINVAL;
 249
 250                 sd = media_entity_to_v4l2_subdev(pad->entity);
 251                 ret = v4l2_subdev_call(sd, video, s_stream, enable);
 252                 if (ret && ret != -ENOIOCTLCMD)
 253                         return ret;
 254         }
 255
 256         return 0;
 257 }
 258 EXPORT_SYMBOL_GPL(vimc_pipeline_s_stream);
 259
 260 static int vimc_get_mbus_format(struct media_pad *pad,
 261                                 struct v4l2_subdev_format *fmt)
 262 {
 263         if (is_media_entity_v4l2_subdev(pad->entity)) {
 264                 struct v4l2_subdev *sd =
 265                         media_entity_to_v4l2_subdev(pad->entity);
 266                 int ret;
 267
 268                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
 269                 fmt->pad = pad->index;
 270
 271                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
 272                 if (ret)
 273                         return ret;
 274
 275         } else if (is_media_entity_v4l2_video_device(pad->entity)) {
 276                 struct video_device *vdev = container_of(pad->entity,
 277                                                          struct video_device,
 278                                                          entity);
 279                 struct vimc_ent_device *ved = video_get_drvdata(vdev);
 280                 const struct vimc_pix_map *vpix;
 281                 struct v4l2_pix_format vdev_fmt;
 282
 283                 if (!ved->vdev_get_format)
 284                         return -ENOIOCTLCMD;
 285
 286                 ved->vdev_get_format(ved, &vdev_fmt);
 287                 vpix = vimc_pix_map_by_pixelformat(vdev_fmt.pixelformat);
 288                 v4l2_fill_mbus_format(&fmt->format, &vdev_fmt, vpix->code);
 289         } else {
 290                 return -EINVAL;
 291         }
 292
 293         return 0;
 294 }
 295
 296 int vimc_link_validate(struct media_link *link)
 297 {
 298         struct v4l2_subdev_format source_fmt, sink_fmt;
 299         int ret;
 300
 301         ret = vimc_get_mbus_format(link->source, &source_fmt);
 302         if (ret)
 303                 return ret;
 304
 305         ret = vimc_get_mbus_format(link->sink, &sink_fmt);
 306         if (ret)
 307                 return ret;
 308
 309         pr_info("vimc link validate: "
 310                 "%s:src:%dx%d (0x%x, %d, %d, %d, %d) "
 311                 "%s:snk:%dx%d (0x%x, %d, %d, %d, %d)\n",
 312                 /* src */
 313                 link->source->entity->name,
 314                 source_fmt.format.width, source_fmt.format.height,
 315                 source_fmt.format.code, source_fmt.format.colorspace,
 316                 source_fmt.format.quantization, source_fmt.format.xfer_func,
 317                 source_fmt.format.ycbcr_enc,
 318                 /* sink */
 319                 link->sink->entity->name,
 320                 sink_fmt.format.width, sink_fmt.format.height,
 321                 sink_fmt.format.code, sink_fmt.format.colorspace,
 322                 sink_fmt.format.quantization, sink_fmt.format.xfer_func,
 323                 sink_fmt.format.ycbcr_enc);
 324
 325         /* The width, height and code must match. */
 326         if (source_fmt.format.width != sink_fmt.format.width
 327             || source_fmt.format.height != sink_fmt.format.height
 328             || source_fmt.format.code != sink_fmt.format.code)
 329                 return -EPIPE;
 330
 331         /*
 332          * The field order must match, or the sink field order must be NONE
 333          * to support interlaced hardware connected to bridges that support
 334          * progressive formats only.
 335          */
 336         if (source_fmt.format.field != sink_fmt.format.field &&
 337             sink_fmt.format.field != V4L2_FIELD_NONE)
 338                 return -EPIPE;
 339
 340         /*
 341          * If colorspace is DEFAULT, then assume all the colorimetry is also
 342          * DEFAULT, return 0 to skip comparing the other colorimetry parameters
 343          */
 344         if (source_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT
 345             || sink_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT)
 346                 return 0;
 347
 348         /* Colorspace must match. */
 349         if (source_fmt.format.colorspace != sink_fmt.format.colorspace)
 350                 return -EPIPE;
 351
 352         /* Colorimetry must match if they are not set to DEFAULT */
 353         if (source_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
 354             && sink_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
 355             && source_fmt.format.ycbcr_enc != sink_fmt.format.ycbcr_enc)
 356                 return -EPIPE;
 357
 358         if (source_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
 359             && sink_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
 360             && source_fmt.format.quantization != sink_fmt.format.quantization)
 361                 return -EPIPE;
 362
 363         if (source_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
 364             && sink_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
 365             && source_fmt.format.xfer_func != sink_fmt.format.xfer_func)
 366                 return -EPIPE;
 367
 368         return 0;
 369 }
 370 EXPORT_SYMBOL_GPL(vimc_link_validate);
 371
 372 static const struct media_entity_operations vimc_ent_sd_mops = {
 373         .link_validate = vimc_link_validate,
 374 };
 375
 376 int vimc_ent_sd_register(struct vimc_ent_device *ved,
 377                          struct v4l2_subdev *sd,
 378                          struct v4l2_device *v4l2_dev,
 379                          const char *const name,
 380                          u32 function,
 381                          u16 num_pads,
 382                          const unsigned long *pads_flag,
 383                          const struct v4l2_subdev_ops *sd_ops)
 384 {
 385         int ret;
 386
 387         /* Allocate the pads */
 388         ved->pads = vimc_pads_init(num_pads, pads_flag);
 389         if (IS_ERR(ved->pads))
 390                 return PTR_ERR(ved->pads);
 391
 392         /* Fill the vimc_ent_device struct */
 393         ved->ent = &sd->entity;
 394
 395         /* Initialize the subdev */
 396         v4l2_subdev_init(sd, sd_ops);
 397         sd->entity.function = function;
 398         sd->entity.ops = &vimc_ent_sd_mops;
 399         sd->owner = THIS_MODULE;
 400         strlcpy(sd->name, name, sizeof(sd->name));
 401         v4l2_set_subdevdata(sd, ved);
 402
 403         /* Expose this subdev to user space */
 404         sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
 405
 406         /* Initialize the media entity */
 407         ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);
 408         if (ret)
 409                 goto err_clean_pads;
 410
 411         /* Register the subdev with the v4l2 and the media framework */
 412         ret = v4l2_device_register_subdev(v4l2_dev, sd);
 413         if (ret) {
 414                 dev_err(v4l2_dev->dev,
 415                         "%s: subdev register failed (err=%d)\n",
 416                         name, ret);
 417                 goto err_clean_m_ent;
 418         }
 419
 420         return 0;
 421
 422 err_clean_m_ent:
 423         media_entity_cleanup(&sd->entity);
 424 err_clean_pads:
 425         vimc_pads_cleanup(ved->pads);
 426         return ret;
 427 }
 428 EXPORT_SYMBOL_GPL(vimc_ent_sd_register);
 429
 430 void vimc_ent_sd_unregister(struct vimc_ent_device *ved, struct v4l2_subdev *sd)
 431 {
 432         v4l2_device_unregister_subdev(sd);
 433         media_entity_cleanup(ved->ent);
 434         vimc_pads_cleanup(ved->pads);
 435 }
 436 EXPORT_SYMBOL_GPL(vimc_ent_sd_unregister);
 437
 438 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Common");
 439 MODULE_AUTHOR("Helen Koike <helen.fornazier@gmail.com>");
 440 MODULE_LICENSE("GPL");