drivers/media/dvb-core/dvbdev.c

   1 // SPDX-License-Identifier: LGPL-2.1-or-later
   2 /*
   3  * dvbdev.c
   4  *
   5  * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
   6  *                  & Marcus Metzler <marcus@convergence.de>
   7  *                    for convergence integrated media GmbH
   8  */
   9
  10 #define pr_fmt(fmt) "dvbdev: " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/i2c.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/device.h>
  21 #include <linux/fs.h>
  22 #include <linux/cdev.h>
  23 #include <linux/mutex.h>
  24 #include <media/dvbdev.h>
  25
  26 /* Due to enum tuner_pad_index */
  27 #include <media/tuner.h>
  28
  29 static DEFINE_MUTEX(dvbdev_mutex);
  30 static LIST_HEAD(dvbdevfops_list);
  31 static int dvbdev_debug;
  32
  33 module_param(dvbdev_debug, int, 0644);
  34 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  35
  36 #define dprintk(fmt, arg...) do {                                       \
  37         if (dvbdev_debug)                                               \
  38                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  39                        __func__, ##arg);                                \
  40 } while (0)
  41
  42 static LIST_HEAD(dvb_adapter_list);
  43 static DEFINE_MUTEX(dvbdev_register_lock);
  44
  45 static const char * const dnames[] = {
  46         [DVB_DEVICE_VIDEO] =            "video",
  47         [DVB_DEVICE_AUDIO] =            "audio",
  48         [DVB_DEVICE_SEC] =              "sec",
  49         [DVB_DEVICE_FRONTEND] =         "frontend",
  50         [DVB_DEVICE_DEMUX] =            "demux",
  51         [DVB_DEVICE_DVR] =              "dvr",
  52         [DVB_DEVICE_CA] =               "ca",
  53         [DVB_DEVICE_NET] =              "net",
  54         [DVB_DEVICE_OSD] =              "osd"
  55 };
  56
  57 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  58 #define MAX_DVB_MINORS          256
  59 #define DVB_MAX_IDS             MAX_DVB_MINORS
  60 #else
  61 #define DVB_MAX_IDS             4
  62
  63 static const u8 minor_type[] = {
  64         [DVB_DEVICE_VIDEO]      = 0,
  65         [DVB_DEVICE_AUDIO]      = 1,
  66         [DVB_DEVICE_SEC]        = 2,
  67         [DVB_DEVICE_FRONTEND]   = 3,
  68         [DVB_DEVICE_DEMUX]      = 4,
  69         [DVB_DEVICE_DVR]        = 5,
  70         [DVB_DEVICE_CA]         = 6,
  71         [DVB_DEVICE_NET]        = 7,
  72         [DVB_DEVICE_OSD]        = 8,
  73 };
  74
  75 #define nums2minor(num, type, id) \
  76         (((num) << 6) | ((id) << 4) | minor_type[type])
  77
  78 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS * 64)
  79 #endif
  80
  81 static struct class *dvb_class;
  82
  83 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  84 static DECLARE_RWSEM(minor_rwsem);
  85
  86 static int dvb_device_open(struct inode *inode, struct file *file)
  87 {
  88         struct dvb_device *dvbdev;
  89         unsigned int minor = iminor(inode);
  90
  91         if (minor >= MAX_DVB_MINORS)
  92                 return -ENODEV;
  93
  94         mutex_lock(&dvbdev_mutex);
  95         down_read(&minor_rwsem);
  96
  97         dvbdev = dvb_minors[minor];
  98
  99         if (dvbdev && dvbdev->fops) {
 100                 int err = 0;
 101                 const struct file_operations *new_fops;
 102
 103                 new_fops = fops_get(dvbdev->fops);
 104                 if (!new_fops)
 105                         goto fail;
 106                 file->private_data = dvb_device_get(dvbdev);
 107                 replace_fops(file, new_fops);
 108                 if (file->f_op->open)
 109                         err = file->f_op->open(inode, file);
 110                 up_read(&minor_rwsem);
 111                 mutex_unlock(&dvbdev_mutex);
 112                 if (err)
 113                         dvb_device_put(dvbdev);
 114                 return err;
 115         }
 116 fail:
 117         up_read(&minor_rwsem);
 118         mutex_unlock(&dvbdev_mutex);
 119         return -ENODEV;
 120 }
 121
 122 static const struct file_operations dvb_device_fops = {
 123         .owner =        THIS_MODULE,
 124         .open =         dvb_device_open,
 125         .llseek =       noop_llseek,
 126 };
 127
 128 static struct cdev dvb_device_cdev;
 129
 130 int dvb_generic_open(struct inode *inode, struct file *file)
 131 {
 132         struct dvb_device *dvbdev = file->private_data;
 133
 134         if (!dvbdev)
 135                 return -ENODEV;
 136
 137         if (!dvbdev->users)
 138                 return -EBUSY;
 139
 140         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 141                 if (!dvbdev->readers)
 142                         return -EBUSY;
 143                 dvbdev->readers--;
 144         } else {
 145                 if (!dvbdev->writers)
 146                         return -EBUSY;
 147                 dvbdev->writers--;
 148         }
 149
 150         dvbdev->users--;
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(dvb_generic_open);
 154
 155 int dvb_generic_release(struct inode *inode, struct file *file)
 156 {
 157         struct dvb_device *dvbdev = file->private_data;
 158
 159         if (!dvbdev)
 160                 return -ENODEV;
 161
 162         if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 163                 dvbdev->readers++;
 164         else
 165                 dvbdev->writers++;
 166
 167         dvbdev->users++;
 168
 169         dvb_device_put(dvbdev);
 170
 171         return 0;
 172 }
 173 EXPORT_SYMBOL(dvb_generic_release);
 174
 175 long dvb_generic_ioctl(struct file *file,
 176                        unsigned int cmd, unsigned long arg)
 177 {
 178         struct dvb_device *dvbdev = file->private_data;
 179
 180         if (!dvbdev)
 181                 return -ENODEV;
 182
 183         if (!dvbdev->kernel_ioctl)
 184                 return -EINVAL;
 185
 186         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 187 }
 188 EXPORT_SYMBOL(dvb_generic_ioctl);
 189
 190 static int dvbdev_get_free_id(struct dvb_adapter *adap, int type)
 191 {
 192         u32 id = 0;
 193
 194         while (id < DVB_MAX_IDS) {
 195                 struct dvb_device *dev;
 196
 197                 list_for_each_entry(dev, &adap->device_list, list_head)
 198                         if (dev->type == type && dev->id == id)
 199                                 goto skip;
 200                 return id;
 201 skip:
 202                 id++;
 203         }
 204         return -ENFILE;
 205 }
 206
 207 static void dvb_media_device_free(struct dvb_device *dvbdev)
 208 {
 209 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 210         if (dvbdev->entity) {
 211                 media_device_unregister_entity(dvbdev->entity);
 212                 kfree(dvbdev->entity);
 213                 kfree(dvbdev->pads);
 214                 dvbdev->entity = NULL;
 215                 dvbdev->pads = NULL;
 216         }
 217
 218         if (dvbdev->tsout_entity) {
 219                 int i;
 220
 221                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 222                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 223                         kfree(dvbdev->tsout_entity[i].name);
 224                 }
 225                 kfree(dvbdev->tsout_entity);
 226                 kfree(dvbdev->tsout_pads);
 227                 dvbdev->tsout_entity = NULL;
 228                 dvbdev->tsout_pads = NULL;
 229
 230                 dvbdev->tsout_num_entities = 0;
 231         }
 232
 233         if (dvbdev->intf_devnode) {
 234                 media_devnode_remove(dvbdev->intf_devnode);
 235                 dvbdev->intf_devnode = NULL;
 236         }
 237
 238         if (dvbdev->adapter->conn) {
 239                 media_device_unregister_entity(dvbdev->adapter->conn);
 240                 kfree(dvbdev->adapter->conn);
 241                 dvbdev->adapter->conn = NULL;
 242                 kfree(dvbdev->adapter->conn_pads);
 243                 dvbdev->adapter->conn_pads = NULL;
 244         }
 245 #endif
 246 }
 247
 248 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 249 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 250                                    const char *name, int npads)
 251 {
 252         int i;
 253
 254         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 255                                      GFP_KERNEL);
 256         if (!dvbdev->tsout_pads)
 257                 return -ENOMEM;
 258
 259         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 260                                        GFP_KERNEL);
 261         if (!dvbdev->tsout_entity)
 262                 return -ENOMEM;
 263
 264         dvbdev->tsout_num_entities = npads;
 265
 266         for (i = 0; i < npads; i++) {
 267                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 268                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 269                 int ret;
 270
 271                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 272                 if (!entity->name)
 273                         return -ENOMEM;
 274
 275                 entity->function = MEDIA_ENT_F_IO_DTV;
 276                 pads->flags = MEDIA_PAD_FL_SINK;
 277
 278                 ret = media_entity_pads_init(entity, 1, pads);
 279                 if (ret < 0)
 280                         return ret;
 281
 282                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 283                                                    entity);
 284                 if (ret < 0)
 285                         return ret;
 286         }
 287         return 0;
 288 }
 289
 290 #define DEMUX_TSOUT     "demux-tsout"
 291 #define DVR_TSOUT       "dvr-tsout"
 292
 293 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 294                                    int type, int demux_sink_pads)
 295 {
 296         int i, ret, npads;
 297
 298         switch (type) {
 299         case DVB_DEVICE_FRONTEND:
 300                 npads = 2;
 301                 break;
 302         case DVB_DEVICE_DVR:
 303                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 304                                               demux_sink_pads);
 305                 return ret;
 306         case DVB_DEVICE_DEMUX:
 307                 npads = 1 + demux_sink_pads;
 308                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 309                                               demux_sink_pads);
 310                 if (ret < 0)
 311                         return ret;
 312                 break;
 313         case DVB_DEVICE_CA:
 314                 npads = 2;
 315                 break;
 316         case DVB_DEVICE_NET:
 317                 /*
 318                  * We should be creating entities for the MPE/ULE
 319                  * decapsulation hardware (or software implementation).
 320                  *
 321                  * However, the number of for the MPE/ULE decaps may not be
 322                  * fixed. As we don't have yet dynamic support for PADs at
 323                  * the Media Controller, let's not create the decap
 324                  * entities yet.
 325                  */
 326                 return 0;
 327         default:
 328                 return 0;
 329         }
 330
 331         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 332         if (!dvbdev->entity)
 333                 return -ENOMEM;
 334
 335         dvbdev->entity->name = dvbdev->name;
 336
 337         if (npads) {
 338                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 339                                        GFP_KERNEL);
 340                 if (!dvbdev->pads) {
 341                         kfree(dvbdev->entity);
 342                         dvbdev->entity = NULL;
 343                         return -ENOMEM;
 344                 }
 345         }
 346
 347         switch (type) {
 348         case DVB_DEVICE_FRONTEND:
 349                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 350                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 351                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 352                 break;
 353         case DVB_DEVICE_DEMUX:
 354                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 355                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 356                 for (i = 1; i < npads; i++)
 357                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 358                 break;
 359         case DVB_DEVICE_CA:
 360                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 361                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 362                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 363                 break;
 364         default:
 365                 /* Should never happen, as the first switch prevents it */
 366                 kfree(dvbdev->entity);
 367                 kfree(dvbdev->pads);
 368                 dvbdev->entity = NULL;
 369                 dvbdev->pads = NULL;
 370                 return 0;
 371         }
 372
 373         if (npads) {
 374                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 375                 if (ret)
 376                         return ret;
 377         }
 378         ret = media_device_register_entity(dvbdev->adapter->mdev,
 379                                            dvbdev->entity);
 380         if (ret)
 381                 return ret;
 382
 383         pr_info("%s: media entity '%s' registered.\n",
 384                 __func__, dvbdev->entity->name);
 385
 386         return 0;
 387 }
 388 #endif
 389
 390 static int dvb_register_media_device(struct dvb_device *dvbdev,
 391                                      int type, int minor,
 392                                      unsigned int demux_sink_pads)
 393 {
 394 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 395         struct media_link *link;
 396         u32 intf_type;
 397         int ret;
 398
 399         if (!dvbdev->adapter->mdev)
 400                 return 0;
 401
 402         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 403         if (ret)
 404                 return ret;
 405
 406         switch (type) {
 407         case DVB_DEVICE_FRONTEND:
 408                 intf_type = MEDIA_INTF_T_DVB_FE;
 409                 break;
 410         case DVB_DEVICE_DEMUX:
 411                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 412                 break;
 413         case DVB_DEVICE_DVR:
 414                 intf_type = MEDIA_INTF_T_DVB_DVR;
 415                 break;
 416         case DVB_DEVICE_CA:
 417                 intf_type = MEDIA_INTF_T_DVB_CA;
 418                 break;
 419         case DVB_DEVICE_NET:
 420                 intf_type = MEDIA_INTF_T_DVB_NET;
 421                 break;
 422         default:
 423                 return 0;
 424         }
 425
 426         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 427                                                     intf_type, 0,
 428                                                     DVB_MAJOR, minor);
 429
 430         if (!dvbdev->intf_devnode)
 431                 return -ENOMEM;
 432
 433         /*
 434          * Create the "obvious" link, e. g. the ones that represent
 435          * a direct association between an interface and an entity.
 436          * Other links should be created elsewhere, like:
 437          *              DVB FE intf    -> tuner
 438          *              DVB demux intf -> dvr
 439          */
 440
 441         if (!dvbdev->entity)
 442                 return 0;
 443
 444         link = media_create_intf_link(dvbdev->entity,
 445                                       &dvbdev->intf_devnode->intf,
 446                                       MEDIA_LNK_FL_ENABLED |
 447                                       MEDIA_LNK_FL_IMMUTABLE);
 448         if (!link)
 449                 return -ENOMEM;
 450 #endif
 451         return 0;
 452 }
 453
 454 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 455                         const struct dvb_device *template, void *priv,
 456                         enum dvb_device_type type, int demux_sink_pads)
 457 {
 458         struct dvb_device *dvbdev;
 459         struct file_operations *dvbdevfops = NULL;
 460         struct dvbdevfops_node *node = NULL, *new_node = NULL;
 461         struct device *clsdev;
 462         int minor;
 463         int id, ret;
 464
 465         mutex_lock(&dvbdev_register_lock);
 466
 467         id = dvbdev_get_free_id(adap, type);
 468         if (id < 0) {
 469                 mutex_unlock(&dvbdev_register_lock);
 470                 *pdvbdev = NULL;
 471                 pr_err("%s: couldn't find free device id\n", __func__);
 472                 return -ENFILE;
 473         }
 474
 475         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 476         if (!dvbdev) {
 477                 mutex_unlock(&dvbdev_register_lock);
 478                 return -ENOMEM;
 479         }
 480
 481         /*
 482          * When a device of the same type is probe()d more than once,
 483          * the first allocated fops are used. This prevents memory leaks
 484          * that can occur when the same device is probe()d repeatedly.
 485          */
 486         list_for_each_entry(node, &dvbdevfops_list, list_head) {
 487                 if (node->fops->owner == adap->module &&
 488                     node->type == type && node->template == template) {
 489                         dvbdevfops = node->fops;
 490                         break;
 491                 }
 492         }
 493
 494         if (!dvbdevfops) {
 495                 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 496                 if (!dvbdevfops) {
 497                         kfree(dvbdev);
 498                         *pdvbdev = NULL;
 499                         mutex_unlock(&dvbdev_register_lock);
 500                         return -ENOMEM;
 501                 }
 502
 503                 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
 504                 if (!new_node) {
 505                         kfree(dvbdevfops);
 506                         kfree(dvbdev);
 507                         *pdvbdev = NULL;
 508                         mutex_unlock(&dvbdev_register_lock);
 509                         return -ENOMEM;
 510                 }
 511
 512                 new_node->fops = dvbdevfops;
 513                 new_node->type = type;
 514                 new_node->template = template;
 515                 list_add_tail(&new_node->list_head, &dvbdevfops_list);
 516         }
 517
 518         memcpy(dvbdev, template, sizeof(struct dvb_device));
 519         kref_init(&dvbdev->ref);
 520         dvbdev->type = type;
 521         dvbdev->id = id;
 522         dvbdev->adapter = adap;
 523         dvbdev->priv = priv;
 524         dvbdev->fops = dvbdevfops;
 525         init_waitqueue_head(&dvbdev->wait_queue);
 526         dvbdevfops->owner = adap->module;
 527         list_add_tail(&dvbdev->list_head, &adap->device_list);
 528         down_write(&minor_rwsem);
 529 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 530         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 531                 if (!dvb_minors[minor])
 532                         break;
 533 #else
 534         minor = nums2minor(adap->num, type, id);
 535 #endif
 536         if (minor >= MAX_DVB_MINORS) {
 537                 if (new_node) {
 538                         list_del(&new_node->list_head);
 539                         kfree(dvbdevfops);
 540                         kfree(new_node);
 541                 }
 542                 list_del(&dvbdev->list_head);
 543                 kfree(dvbdev);
 544                 *pdvbdev = NULL;
 545                 up_write(&minor_rwsem);
 546                 mutex_unlock(&dvbdev_register_lock);
 547                 return -EINVAL;
 548         }
 549
 550         dvbdev->minor = minor;
 551         dvb_minors[minor] = dvb_device_get(dvbdev);
 552         up_write(&minor_rwsem);
 553         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 554         if (ret) {
 555                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 556                        __func__);
 557                 if (new_node) {
 558                         list_del(&new_node->list_head);
 559                         kfree(dvbdevfops);
 560                         kfree(new_node);
 561                 }
 562                 dvb_media_device_free(dvbdev);
 563                 list_del(&dvbdev->list_head);
 564                 kfree(dvbdev);
 565                 *pdvbdev = NULL;
 566                 mutex_unlock(&dvbdev_register_lock);
 567                 return ret;
 568         }
 569
 570         clsdev = device_create(dvb_class, adap->device,
 571                                MKDEV(DVB_MAJOR, minor),
 572                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 573         if (IS_ERR(clsdev)) {
 574                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 575                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 576                 if (new_node) {
 577                         list_del(&new_node->list_head);
 578                         kfree(dvbdevfops);
 579                         kfree(new_node);
 580                 }
 581                 dvb_media_device_free(dvbdev);
 582                 list_del(&dvbdev->list_head);
 583                 kfree(dvbdev);
 584                 *pdvbdev = NULL;
 585                 mutex_unlock(&dvbdev_register_lock);
 586                 return PTR_ERR(clsdev);
 587         }
 588
 589         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 590                 adap->num, dnames[type], id, minor, minor);
 591
 592         mutex_unlock(&dvbdev_register_lock);
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(dvb_register_device);
 596
 597 void dvb_remove_device(struct dvb_device *dvbdev)
 598 {
 599         if (!dvbdev)
 600                 return;
 601
 602         down_write(&minor_rwsem);
 603         dvb_minors[dvbdev->minor] = NULL;
 604         dvb_device_put(dvbdev);
 605         up_write(&minor_rwsem);
 606
 607         dvb_media_device_free(dvbdev);
 608
 609         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 610
 611         list_del(&dvbdev->list_head);
 612 }
 613 EXPORT_SYMBOL(dvb_remove_device);
 614
 615 static void dvb_free_device(struct kref *ref)
 616 {
 617         struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
 618
 619         kfree(dvbdev);
 620 }
 621
 622 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
 623 {
 624         kref_get(&dvbdev->ref);
 625         return dvbdev;
 626 }
 627 EXPORT_SYMBOL(dvb_device_get);
 628
 629 void dvb_device_put(struct dvb_device *dvbdev)
 630 {
 631         if (dvbdev)
 632                 kref_put(&dvbdev->ref, dvb_free_device);
 633 }
 634
 635 void dvb_unregister_device(struct dvb_device *dvbdev)
 636 {
 637         dvb_remove_device(dvbdev);
 638         dvb_device_put(dvbdev);
 639 }
 640 EXPORT_SYMBOL(dvb_unregister_device);
 641
 642 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 643
 644 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 645                                     struct media_interface *intf,
 646                                     char *name)
 647 {
 648         struct media_device *mdev = adap->mdev;
 649         struct media_entity *entity;
 650         struct media_link *link;
 651
 652         media_device_for_each_entity(entity, mdev) {
 653                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 654                         if (strncmp(entity->name, name, strlen(name)))
 655                                 continue;
 656                         link = media_create_intf_link(entity, intf,
 657                                                       MEDIA_LNK_FL_ENABLED |
 658                                                       MEDIA_LNK_FL_IMMUTABLE);
 659                         if (!link)
 660                                 return -ENOMEM;
 661                 }
 662         }
 663         return 0;
 664 }
 665
 666 int dvb_create_media_graph(struct dvb_adapter *adap,
 667                            bool create_rf_connector)
 668 {
 669         struct media_device *mdev = adap->mdev;
 670         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 671         struct media_entity *demux = NULL, *ca = NULL;
 672         struct media_link *link;
 673         struct media_interface *intf;
 674         unsigned int demux_pad = 0;
 675         unsigned int dvr_pad = 0;
 676         unsigned int ntuner = 0, ndemod = 0;
 677         int ret, pad_source, pad_sink;
 678         static const char *connector_name = "Television";
 679
 680         if (!mdev)
 681                 return 0;
 682
 683         media_device_for_each_entity(entity, mdev) {
 684                 switch (entity->function) {
 685                 case MEDIA_ENT_F_TUNER:
 686                         tuner = entity;
 687                         ntuner++;
 688                         break;
 689                 case MEDIA_ENT_F_DTV_DEMOD:
 690                         demod = entity;
 691                         ndemod++;
 692                         break;
 693                 case MEDIA_ENT_F_TS_DEMUX:
 694                         demux = entity;
 695                         break;
 696                 case MEDIA_ENT_F_DTV_CA:
 697                         ca = entity;
 698                         break;
 699                 }
 700         }
 701
 702         /*
 703          * Prepare to signalize to media_create_pad_links() that multiple
 704          * entities of the same type exists and a 1:n or n:1 links need to be
 705          * created.
 706          * NOTE: if both tuner and demod have multiple instances, it is up
 707          * to the caller driver to create such links.
 708          */
 709         if (ntuner > 1)
 710                 tuner = NULL;
 711         if (ndemod > 1)
 712                 demod = NULL;
 713
 714         if (create_rf_connector) {
 715                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 716                 if (!conn)
 717                         return -ENOMEM;
 718                 adap->conn = conn;
 719
 720                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 721                 if (!adap->conn_pads)
 722                         return -ENOMEM;
 723
 724                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 725                 conn->function = MEDIA_ENT_F_CONN_RF;
 726                 conn->name = connector_name;
 727                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 728
 729                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 730                 if (ret)
 731                         return ret;
 732
 733                 ret = media_device_register_entity(mdev, conn);
 734                 if (ret)
 735                         return ret;
 736
 737                 if (!ntuner) {
 738                         ret = media_create_pad_links(mdev,
 739                                                      MEDIA_ENT_F_CONN_RF,
 740                                                      conn, 0,
 741                                                      MEDIA_ENT_F_DTV_DEMOD,
 742                                                      demod, 0,
 743                                                      MEDIA_LNK_FL_ENABLED,
 744                                                      false);
 745                 } else {
 746                         pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
 747                                                        PAD_SIGNAL_ANALOG);
 748                         if (pad_sink < 0)
 749                                 return -EINVAL;
 750                         ret = media_create_pad_links(mdev,
 751                                                      MEDIA_ENT_F_CONN_RF,
 752                                                      conn, 0,
 753                                                      MEDIA_ENT_F_TUNER,
 754                                                      tuner, pad_sink,
 755                                                      MEDIA_LNK_FL_ENABLED,
 756                                                      false);
 757                 }
 758                 if (ret)
 759                         return ret;
 760         }
 761
 762         if (ntuner && ndemod) {
 763                 /* NOTE: first found tuner source pad presumed correct */
 764                 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,
 765                                                  PAD_SIGNAL_ANALOG);
 766                 if (pad_source < 0)
 767                         return -EINVAL;
 768                 ret = media_create_pad_links(mdev,
 769                                              MEDIA_ENT_F_TUNER,
 770                                              tuner, pad_source,
 771                                              MEDIA_ENT_F_DTV_DEMOD,
 772                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 773                                              false);
 774                 if (ret)
 775                         return ret;
 776         }
 777
 778         if (ndemod && demux) {
 779                 ret = media_create_pad_links(mdev,
 780                                              MEDIA_ENT_F_DTV_DEMOD,
 781                                              demod, 1,
 782                                              MEDIA_ENT_F_TS_DEMUX,
 783                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 784                                              false);
 785                 if (ret)
 786                         return ret;
 787         }
 788         if (demux && ca) {
 789                 ret = media_create_pad_link(demux, 1, ca,
 790                                             0, MEDIA_LNK_FL_ENABLED);
 791                 if (ret)
 792                         return ret;
 793         }
 794
 795         /* Create demux links for each ringbuffer/pad */
 796         if (demux) {
 797                 media_device_for_each_entity(entity, mdev) {
 798                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 799                                 if (!strncmp(entity->name, DVR_TSOUT,
 800                                              strlen(DVR_TSOUT))) {
 801                                         ret = media_create_pad_link(demux,
 802                                                                     ++dvr_pad,
 803                                                                     entity, 0, 0);
 804                                         if (ret)
 805                                                 return ret;
 806                                 }
 807                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 808                                              strlen(DEMUX_TSOUT))) {
 809                                         ret = media_create_pad_link(demux,
 810                                                                     ++demux_pad,
 811                                                                     entity, 0, 0);
 812                                         if (ret)
 813                                                 return ret;
 814                                 }
 815                         }
 816                 }
 817         }
 818
 819         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 820         media_device_for_each_intf(intf, mdev) {
 821                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 822                         link = media_create_intf_link(ca, intf,
 823                                                       MEDIA_LNK_FL_ENABLED |
 824                                                       MEDIA_LNK_FL_IMMUTABLE);
 825                         if (!link)
 826                                 return -ENOMEM;
 827                 }
 828
 829                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 830                         link = media_create_intf_link(tuner, intf,
 831                                                       MEDIA_LNK_FL_ENABLED |
 832                                                       MEDIA_LNK_FL_IMMUTABLE);
 833                         if (!link)
 834                                 return -ENOMEM;
 835                 }
 836 #if 0
 837                 /*
 838                  * Indirect link - let's not create yet, as we don't know how
 839                  *                 to handle indirect links, nor if this will
 840                  *                 actually be needed.
 841                  */
 842                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 843                         link = media_create_intf_link(demux, intf,
 844                                                       MEDIA_LNK_FL_ENABLED |
 845                                                       MEDIA_LNK_FL_IMMUTABLE);
 846                         if (!link)
 847                                 return -ENOMEM;
 848                 }
 849 #endif
 850                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 851                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 852                         if (ret)
 853                                 return ret;
 854                 }
 855                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 856                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 857                         if (ret)
 858                                 return ret;
 859                 }
 860         }
 861         return 0;
 862 }
 863 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 864 #endif
 865
 866 static int dvbdev_check_free_adapter_num(int num)
 867 {
 868         struct list_head *entry;
 869
 870         list_for_each(entry, &dvb_adapter_list) {
 871                 struct dvb_adapter *adap;
 872
 873                 adap = list_entry(entry, struct dvb_adapter, list_head);
 874                 if (adap->num == num)
 875                         return 0;
 876         }
 877         return 1;
 878 }
 879
 880 static int dvbdev_get_free_adapter_num(void)
 881 {
 882         int num = 0;
 883
 884         while (num < DVB_MAX_ADAPTERS) {
 885                 if (dvbdev_check_free_adapter_num(num))
 886                         return num;
 887                 num++;
 888         }
 889
 890         return -ENFILE;
 891 }
 892
 893 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 894                          struct module *module, struct device *device,
 895                          short *adapter_nums)
 896 {
 897         int i, num;
 898
 899         mutex_lock(&dvbdev_register_lock);
 900
 901         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 902                 num = adapter_nums[i];
 903                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 904                 /* use the one the driver asked for */
 905                         if (dvbdev_check_free_adapter_num(num))
 906                                 break;
 907                 } else {
 908                         num = dvbdev_get_free_adapter_num();
 909                         break;
 910                 }
 911                 num = -1;
 912         }
 913
 914         if (num < 0) {
 915                 mutex_unlock(&dvbdev_register_lock);
 916                 return -ENFILE;
 917         }
 918
 919         memset(adap, 0, sizeof(struct dvb_adapter));
 920         INIT_LIST_HEAD(&adap->device_list);
 921
 922         pr_info("DVB: registering new adapter (%s)\n", name);
 923
 924         adap->num = num;
 925         adap->name = name;
 926         adap->module = module;
 927         adap->device = device;
 928         adap->mfe_shared = 0;
 929         adap->mfe_dvbdev = NULL;
 930         mutex_init(&adap->mfe_lock);
 931
 932 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 933         mutex_init(&adap->mdev_lock);
 934 #endif
 935
 936         list_add_tail(&adap->list_head, &dvb_adapter_list);
 937
 938         mutex_unlock(&dvbdev_register_lock);
 939
 940         return num;
 941 }
 942 EXPORT_SYMBOL(dvb_register_adapter);
 943
 944 int dvb_unregister_adapter(struct dvb_adapter *adap)
 945 {
 946         mutex_lock(&dvbdev_register_lock);
 947         list_del(&adap->list_head);
 948         mutex_unlock(&dvbdev_register_lock);
 949         return 0;
 950 }
 951 EXPORT_SYMBOL(dvb_unregister_adapter);
 952
 953 /*
 954  * if the miracle happens and "generic_usercopy()" is included into
 955  * the kernel, then this can vanish. please don't make the mistake and
 956  * define this as video_usercopy(). this will introduce a dependency
 957  * to the v4l "videodev.o" module, which is unnecessary for some
 958  * cards (ie. the budget dvb-cards don't need the v4l module...)
 959  */
 960 int dvb_usercopy(struct file *file,
 961                  unsigned int cmd, unsigned long arg,
 962                  int (*func)(struct file *file,
 963                              unsigned int cmd, void *arg))
 964 {
 965         char    sbuf[128] = {};
 966         void    *mbuf = NULL;
 967         void    *parg = NULL;
 968         int     err  = -EINVAL;
 969
 970         /*  Copy arguments into temp kernel buffer  */
 971         switch (_IOC_DIR(cmd)) {
 972         case _IOC_NONE:
 973                 /*
 974                  * For this command, the pointer is actually an integer
 975                  * argument.
 976                  */
 977                 parg = (void *)arg;
 978                 break;
 979         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 980         case _IOC_WRITE:
 981         case (_IOC_WRITE | _IOC_READ):
 982                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 983                         parg = sbuf;
 984                 } else {
 985                         /* too big to allocate from stack */
 986                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 987                         if (!mbuf)
 988                                 return -ENOMEM;
 989                         parg = mbuf;
 990                 }
 991
 992                 err = -EFAULT;
 993                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 994                         goto out;
 995                 break;
 996         }
 997
 998         /* call driver */
 999         err = func(file, cmd, parg);
1000         if (err == -ENOIOCTLCMD)
1001                 err = -ENOTTY;
1002
1003         if (err < 0)
1004                 goto out;
1005
1006         /*  Copy results into user buffer  */
1007         switch (_IOC_DIR(cmd)) {
1008         case _IOC_READ:
1009         case (_IOC_WRITE | _IOC_READ):
1010                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1011                         err = -EFAULT;
1012                 break;
1013         }
1014
1015 out:
1016         kfree(mbuf);
1017         return err;
1018 }
1019
1020 #if IS_ENABLED(CONFIG_I2C)
1021 struct i2c_client *dvb_module_probe(const char *module_name,
1022                                     const char *name,
1023                                     struct i2c_adapter *adap,
1024                                     unsigned char addr,
1025                                     void *platform_data)
1026 {
1027         struct i2c_client *client;
1028         struct i2c_board_info *board_info;
1029
1030         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1031         if (!board_info)
1032                 return NULL;
1033
1034         if (name)
1035                 strscpy(board_info->type, name, I2C_NAME_SIZE);
1036         else
1037                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1038
1039         board_info->addr = addr;
1040         board_info->platform_data = platform_data;
1041         request_module(module_name);
1042         client = i2c_new_client_device(adap, board_info);
1043         if (!i2c_client_has_driver(client)) {
1044                 kfree(board_info);
1045                 return NULL;
1046         }
1047
1048         if (!try_module_get(client->dev.driver->owner)) {
1049                 i2c_unregister_device(client);
1050                 client = NULL;
1051         }
1052
1053         kfree(board_info);
1054         return client;
1055 }
1056 EXPORT_SYMBOL_GPL(dvb_module_probe);
1057
1058 void dvb_module_release(struct i2c_client *client)
1059 {
1060         if (!client)
1061                 return;
1062
1063         module_put(client->dev.driver->owner);
1064         i2c_unregister_device(client);
1065 }
1066 EXPORT_SYMBOL_GPL(dvb_module_release);
1067 #endif
1068
1069 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1070 {
1071         const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1072
1073         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1074         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1075         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1076         return 0;
1077 }
1078
1079 static char *dvb_devnode(const struct device *dev, umode_t *mode)
1080 {
1081         const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1082
1083         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1084                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1085 }
1086
1087 static int __init init_dvbdev(void)
1088 {
1089         int retval;
1090         dev_t dev = MKDEV(DVB_MAJOR, 0);
1091
1092         retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");
1093         if (retval != 0) {
1094                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1095                 return retval;
1096         }
1097
1098         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1099         retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);
1100         if (retval != 0) {
1101                 pr_err("dvb-core: unable register character device\n");
1102                 goto error;
1103         }
1104
1105         dvb_class = class_create("dvb");
1106         if (IS_ERR(dvb_class)) {
1107                 retval = PTR_ERR(dvb_class);
1108                 goto error;
1109         }
1110         dvb_class->dev_uevent = dvb_uevent;
1111         dvb_class->devnode = dvb_devnode;
1112         return 0;
1113
1114 error:
1115         cdev_del(&dvb_device_cdev);
1116         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1117         return retval;
1118 }
1119
1120 static void __exit exit_dvbdev(void)
1121 {
1122         struct dvbdevfops_node *node, *next;
1123
1124         class_destroy(dvb_class);
1125         cdev_del(&dvb_device_cdev);
1126         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1127
1128         list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1129                 list_del(&node->list_head);
1130                 kfree(node->fops);
1131                 kfree(node);
1132         }
1133 }
1134
1135 subsys_initcall(init_dvbdev);
1136 module_exit(exit_dvbdev);
1137
1138 MODULE_DESCRIPTION("DVB Core Driver");
1139 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1140 MODULE_LICENSE("GPL");