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