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                         mutex_unlock(&dvbdev_register_lock);
 494                         return -ENOMEM;
 495                 }
 496
 497                 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
 498                 if (!new_node) {
 499                         kfree(dvbdevfops);
 500                         kfree(dvbdev);
 501                         mutex_unlock(&dvbdev_register_lock);
 502                         return -ENOMEM;
 503                 }
 504
 505                 new_node->fops = dvbdevfops;
 506                 new_node->type = type;
 507                 new_node->template = template;
 508                 list_add_tail(&new_node->list_head, &dvbdevfops_list);
 509         }
 510
 511         memcpy(dvbdev, template, sizeof(struct dvb_device));
 512         kref_init(&dvbdev->ref);
 513         dvbdev->type = type;
 514         dvbdev->id = id;
 515         dvbdev->adapter = adap;
 516         dvbdev->priv = priv;
 517         dvbdev->fops = dvbdevfops;
 518         init_waitqueue_head(&dvbdev->wait_queue);
 519         dvbdevfops->owner = adap->module;
 520         list_add_tail(&dvbdev->list_head, &adap->device_list);
 521         down_write(&minor_rwsem);
 522 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 523         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 524                 if (!dvb_minors[minor])
 525                         break;
 526         if (minor == MAX_DVB_MINORS) {
 527                 if (new_node) {
 528                         list_del(&new_node->list_head);
 529                         kfree(dvbdevfops);
 530                         kfree(new_node);
 531                 }
 532                 list_del(&dvbdev->list_head);
 533                 kfree(dvbdev);
 534                 up_write(&minor_rwsem);
 535                 mutex_unlock(&dvbdev_register_lock);
 536                 return -EINVAL;
 537         }
 538 #else
 539         minor = nums2minor(adap->num, type, id);
 540 #endif
 541         dvbdev->minor = minor;
 542         dvb_minors[minor] = dvb_device_get(dvbdev);
 543         up_write(&minor_rwsem);
 544         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 545         if (ret) {
 546                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 547                        __func__);
 548                 if (new_node) {
 549                         list_del(&new_node->list_head);
 550                         kfree(dvbdevfops);
 551                         kfree(new_node);
 552                 }
 553                 dvb_media_device_free(dvbdev);
 554                 list_del(&dvbdev->list_head);
 555                 kfree(dvbdev);
 556                 mutex_unlock(&dvbdev_register_lock);
 557                 return ret;
 558         }
 559
 560         clsdev = device_create(dvb_class, adap->device,
 561                                MKDEV(DVB_MAJOR, minor),
 562                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 563         if (IS_ERR(clsdev)) {
 564                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 565                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 566                 if (new_node) {
 567                         list_del(&new_node->list_head);
 568                         kfree(dvbdevfops);
 569                         kfree(new_node);
 570                 }
 571                 dvb_media_device_free(dvbdev);
 572                 list_del(&dvbdev->list_head);
 573                 kfree(dvbdev);
 574                 mutex_unlock(&dvbdev_register_lock);
 575                 return PTR_ERR(clsdev);
 576         }
 577
 578         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 579                 adap->num, dnames[type], id, minor, minor);
 580
 581         mutex_unlock(&dvbdev_register_lock);
 582         return 0;
 583 }
 584 EXPORT_SYMBOL(dvb_register_device);
 585
 586 void dvb_remove_device(struct dvb_device *dvbdev)
 587 {
 588         if (!dvbdev)
 589                 return;
 590
 591         down_write(&minor_rwsem);
 592         dvb_minors[dvbdev->minor] = NULL;
 593         dvb_device_put(dvbdev);
 594         up_write(&minor_rwsem);
 595
 596         dvb_media_device_free(dvbdev);
 597
 598         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 599
 600         list_del(&dvbdev->list_head);
 601 }
 602 EXPORT_SYMBOL(dvb_remove_device);
 603
 604 static void dvb_free_device(struct kref *ref)
 605 {
 606         struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
 607
 608         kfree(dvbdev);
 609 }
 610
 611 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
 612 {
 613         kref_get(&dvbdev->ref);
 614         return dvbdev;
 615 }
 616 EXPORT_SYMBOL(dvb_device_get);
 617
 618 void dvb_device_put(struct dvb_device *dvbdev)
 619 {
 620         if (dvbdev)
 621                 kref_put(&dvbdev->ref, dvb_free_device);
 622 }
 623
 624 void dvb_unregister_device(struct dvb_device *dvbdev)
 625 {
 626         dvb_remove_device(dvbdev);
 627         dvb_device_put(dvbdev);
 628 }
 629 EXPORT_SYMBOL(dvb_unregister_device);
 630
 631 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 632
 633 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 634                                     struct media_interface *intf,
 635                                     char *name)
 636 {
 637         struct media_device *mdev = adap->mdev;
 638         struct media_entity *entity;
 639         struct media_link *link;
 640
 641         media_device_for_each_entity(entity, mdev) {
 642                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 643                         if (strncmp(entity->name, name, strlen(name)))
 644                                 continue;
 645                         link = media_create_intf_link(entity, intf,
 646                                                       MEDIA_LNK_FL_ENABLED |
 647                                                       MEDIA_LNK_FL_IMMUTABLE);
 648                         if (!link)
 649                                 return -ENOMEM;
 650                 }
 651         }
 652         return 0;
 653 }
 654
 655 int dvb_create_media_graph(struct dvb_adapter *adap,
 656                            bool create_rf_connector)
 657 {
 658         struct media_device *mdev = adap->mdev;
 659         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 660         struct media_entity *demux = NULL, *ca = NULL;
 661         struct media_link *link;
 662         struct media_interface *intf;
 663         unsigned int demux_pad = 0;
 664         unsigned int dvr_pad = 0;
 665         unsigned int ntuner = 0, ndemod = 0;
 666         int ret, pad_source, pad_sink;
 667         static const char *connector_name = "Television";
 668
 669         if (!mdev)
 670                 return 0;
 671
 672         media_device_for_each_entity(entity, mdev) {
 673                 switch (entity->function) {
 674                 case MEDIA_ENT_F_TUNER:
 675                         tuner = entity;
 676                         ntuner++;
 677                         break;
 678                 case MEDIA_ENT_F_DTV_DEMOD:
 679                         demod = entity;
 680                         ndemod++;
 681                         break;
 682                 case MEDIA_ENT_F_TS_DEMUX:
 683                         demux = entity;
 684                         break;
 685                 case MEDIA_ENT_F_DTV_CA:
 686                         ca = entity;
 687                         break;
 688                 }
 689         }
 690
 691         /*
 692          * Prepare to signalize to media_create_pad_links() that multiple
 693          * entities of the same type exists and a 1:n or n:1 links need to be
 694          * created.
 695          * NOTE: if both tuner and demod have multiple instances, it is up
 696          * to the caller driver to create such links.
 697          */
 698         if (ntuner > 1)
 699                 tuner = NULL;
 700         if (ndemod > 1)
 701                 demod = NULL;
 702
 703         if (create_rf_connector) {
 704                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 705                 if (!conn)
 706                         return -ENOMEM;
 707                 adap->conn = conn;
 708
 709                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 710                 if (!adap->conn_pads)
 711                         return -ENOMEM;
 712
 713                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 714                 conn->function = MEDIA_ENT_F_CONN_RF;
 715                 conn->name = connector_name;
 716                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 717
 718                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 719                 if (ret)
 720                         return ret;
 721
 722                 ret = media_device_register_entity(mdev, conn);
 723                 if (ret)
 724                         return ret;
 725
 726                 if (!ntuner) {
 727                         ret = media_create_pad_links(mdev,
 728                                                      MEDIA_ENT_F_CONN_RF,
 729                                                      conn, 0,
 730                                                      MEDIA_ENT_F_DTV_DEMOD,
 731                                                      demod, 0,
 732                                                      MEDIA_LNK_FL_ENABLED,
 733                                                      false);
 734                 } else {
 735                         pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
 736                                                        PAD_SIGNAL_ANALOG);
 737                         if (pad_sink < 0)
 738                                 return -EINVAL;
 739                         ret = media_create_pad_links(mdev,
 740                                                      MEDIA_ENT_F_CONN_RF,
 741                                                      conn, 0,
 742                                                      MEDIA_ENT_F_TUNER,
 743                                                      tuner, pad_sink,
 744                                                      MEDIA_LNK_FL_ENABLED,
 745                                                      false);
 746                 }
 747                 if (ret)
 748                         return ret;
 749         }
 750
 751         if (ntuner && ndemod) {
 752                 /* NOTE: first found tuner source pad presumed correct */
 753                 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,
 754                                                  PAD_SIGNAL_ANALOG);
 755                 if (pad_source < 0)
 756                         return -EINVAL;
 757                 ret = media_create_pad_links(mdev,
 758                                              MEDIA_ENT_F_TUNER,
 759                                              tuner, pad_source,
 760                                              MEDIA_ENT_F_DTV_DEMOD,
 761                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 762                                              false);
 763                 if (ret)
 764                         return ret;
 765         }
 766
 767         if (ndemod && demux) {
 768                 ret = media_create_pad_links(mdev,
 769                                              MEDIA_ENT_F_DTV_DEMOD,
 770                                              demod, 1,
 771                                              MEDIA_ENT_F_TS_DEMUX,
 772                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 773                                              false);
 774                 if (ret)
 775                         return ret;
 776         }
 777         if (demux && ca) {
 778                 ret = media_create_pad_link(demux, 1, ca,
 779                                             0, MEDIA_LNK_FL_ENABLED);
 780                 if (ret)
 781                         return ret;
 782         }
 783
 784         /* Create demux links for each ringbuffer/pad */
 785         if (demux) {
 786                 media_device_for_each_entity(entity, mdev) {
 787                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 788                                 if (!strncmp(entity->name, DVR_TSOUT,
 789                                              strlen(DVR_TSOUT))) {
 790                                         ret = media_create_pad_link(demux,
 791                                                                     ++dvr_pad,
 792                                                                     entity, 0, 0);
 793                                         if (ret)
 794                                                 return ret;
 795                                 }
 796                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 797                                              strlen(DEMUX_TSOUT))) {
 798                                         ret = media_create_pad_link(demux,
 799                                                                     ++demux_pad,
 800                                                                     entity, 0, 0);
 801                                         if (ret)
 802                                                 return ret;
 803                                 }
 804                         }
 805                 }
 806         }
 807
 808         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 809         media_device_for_each_intf(intf, mdev) {
 810                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 811                         link = media_create_intf_link(ca, intf,
 812                                                       MEDIA_LNK_FL_ENABLED |
 813                                                       MEDIA_LNK_FL_IMMUTABLE);
 814                         if (!link)
 815                                 return -ENOMEM;
 816                 }
 817
 818                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 819                         link = media_create_intf_link(tuner, intf,
 820                                                       MEDIA_LNK_FL_ENABLED |
 821                                                       MEDIA_LNK_FL_IMMUTABLE);
 822                         if (!link)
 823                                 return -ENOMEM;
 824                 }
 825 #if 0
 826                 /*
 827                  * Indirect link - let's not create yet, as we don't know how
 828                  *                 to handle indirect links, nor if this will
 829                  *                 actually be needed.
 830                  */
 831                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 832                         link = media_create_intf_link(demux, intf,
 833                                                       MEDIA_LNK_FL_ENABLED |
 834                                                       MEDIA_LNK_FL_IMMUTABLE);
 835                         if (!link)
 836                                 return -ENOMEM;
 837                 }
 838 #endif
 839                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 840                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 841                         if (ret)
 842                                 return ret;
 843                 }
 844                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 845                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 846                         if (ret)
 847                                 return ret;
 848                 }
 849         }
 850         return 0;
 851 }
 852 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 853 #endif
 854
 855 static int dvbdev_check_free_adapter_num(int num)
 856 {
 857         struct list_head *entry;
 858
 859         list_for_each(entry, &dvb_adapter_list) {
 860                 struct dvb_adapter *adap;
 861
 862                 adap = list_entry(entry, struct dvb_adapter, list_head);
 863                 if (adap->num == num)
 864                         return 0;
 865         }
 866         return 1;
 867 }
 868
 869 static int dvbdev_get_free_adapter_num(void)
 870 {
 871         int num = 0;
 872
 873         while (num < DVB_MAX_ADAPTERS) {
 874                 if (dvbdev_check_free_adapter_num(num))
 875                         return num;
 876                 num++;
 877         }
 878
 879         return -ENFILE;
 880 }
 881
 882 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 883                          struct module *module, struct device *device,
 884                          short *adapter_nums)
 885 {
 886         int i, num;
 887
 888         mutex_lock(&dvbdev_register_lock);
 889
 890         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 891                 num = adapter_nums[i];
 892                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 893                 /* use the one the driver asked for */
 894                         if (dvbdev_check_free_adapter_num(num))
 895                                 break;
 896                 } else {
 897                         num = dvbdev_get_free_adapter_num();
 898                         break;
 899                 }
 900                 num = -1;
 901         }
 902
 903         if (num < 0) {
 904                 mutex_unlock(&dvbdev_register_lock);
 905                 return -ENFILE;
 906         }
 907
 908         memset(adap, 0, sizeof(struct dvb_adapter));
 909         INIT_LIST_HEAD(&adap->device_list);
 910
 911         pr_info("DVB: registering new adapter (%s)\n", name);
 912
 913         adap->num = num;
 914         adap->name = name;
 915         adap->module = module;
 916         adap->device = device;
 917         adap->mfe_shared = 0;
 918         adap->mfe_dvbdev = NULL;
 919         mutex_init(&adap->mfe_lock);
 920
 921 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 922         mutex_init(&adap->mdev_lock);
 923 #endif
 924
 925         list_add_tail(&adap->list_head, &dvb_adapter_list);
 926
 927         mutex_unlock(&dvbdev_register_lock);
 928
 929         return num;
 930 }
 931 EXPORT_SYMBOL(dvb_register_adapter);
 932
 933 int dvb_unregister_adapter(struct dvb_adapter *adap)
 934 {
 935         mutex_lock(&dvbdev_register_lock);
 936         list_del(&adap->list_head);
 937         mutex_unlock(&dvbdev_register_lock);
 938         return 0;
 939 }
 940 EXPORT_SYMBOL(dvb_unregister_adapter);
 941
 942 /*
 943  * if the miracle happens and "generic_usercopy()" is included into
 944  * the kernel, then this can vanish. please don't make the mistake and
 945  * define this as video_usercopy(). this will introduce a dependency
 946  * to the v4l "videodev.o" module, which is unnecessary for some
 947  * cards (ie. the budget dvb-cards don't need the v4l module...)
 948  */
 949 int dvb_usercopy(struct file *file,
 950                  unsigned int cmd, unsigned long arg,
 951                  int (*func)(struct file *file,
 952                              unsigned int cmd, void *arg))
 953 {
 954         char    sbuf[128];
 955         void    *mbuf = NULL;
 956         void    *parg = NULL;
 957         int     err  = -EINVAL;
 958
 959         /*  Copy arguments into temp kernel buffer  */
 960         switch (_IOC_DIR(cmd)) {
 961         case _IOC_NONE:
 962                 /*
 963                  * For this command, the pointer is actually an integer
 964                  * argument.
 965                  */
 966                 parg = (void *)arg;
 967                 break;
 968         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 969         case _IOC_WRITE:
 970         case (_IOC_WRITE | _IOC_READ):
 971                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 972                         parg = sbuf;
 973                 } else {
 974                         /* too big to allocate from stack */
 975                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 976                         if (!mbuf)
 977                                 return -ENOMEM;
 978                         parg = mbuf;
 979                 }
 980
 981                 err = -EFAULT;
 982                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 983                         goto out;
 984                 break;
 985         }
 986
 987         /* call driver */
 988         err = func(file, cmd, parg);
 989         if (err == -ENOIOCTLCMD)
 990                 err = -ENOTTY;
 991
 992         if (err < 0)
 993                 goto out;
 994
 995         /*  Copy results into user buffer  */
 996         switch (_IOC_DIR(cmd)) {
 997         case _IOC_READ:
 998         case (_IOC_WRITE | _IOC_READ):
 999                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1000                         err = -EFAULT;
1001                 break;
1002         }
1003
1004 out:
1005         kfree(mbuf);
1006         return err;
1007 }
1008
1009 #if IS_ENABLED(CONFIG_I2C)
1010 struct i2c_client *dvb_module_probe(const char *module_name,
1011                                     const char *name,
1012                                     struct i2c_adapter *adap,
1013                                     unsigned char addr,
1014                                     void *platform_data)
1015 {
1016         struct i2c_client *client;
1017         struct i2c_board_info *board_info;
1018
1019         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1020         if (!board_info)
1021                 return NULL;
1022
1023         if (name)
1024                 strscpy(board_info->type, name, I2C_NAME_SIZE);
1025         else
1026                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1027
1028         board_info->addr = addr;
1029         board_info->platform_data = platform_data;
1030         request_module(module_name);
1031         client = i2c_new_client_device(adap, board_info);
1032         if (!i2c_client_has_driver(client)) {
1033                 kfree(board_info);
1034                 return NULL;
1035         }
1036
1037         if (!try_module_get(client->dev.driver->owner)) {
1038                 i2c_unregister_device(client);
1039                 client = NULL;
1040         }
1041
1042         kfree(board_info);
1043         return client;
1044 }
1045 EXPORT_SYMBOL_GPL(dvb_module_probe);
1046
1047 void dvb_module_release(struct i2c_client *client)
1048 {
1049         if (!client)
1050                 return;
1051
1052         module_put(client->dev.driver->owner);
1053         i2c_unregister_device(client);
1054 }
1055 EXPORT_SYMBOL_GPL(dvb_module_release);
1056 #endif
1057
1058 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1059 {
1060         const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1061
1062         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1063         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1064         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1065         return 0;
1066 }
1067
1068 static char *dvb_devnode(const struct device *dev, umode_t *mode)
1069 {
1070         const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1071
1072         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1073                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1074 }
1075
1076 static int __init init_dvbdev(void)
1077 {
1078         int retval;
1079         dev_t dev = MKDEV(DVB_MAJOR, 0);
1080
1081         retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");
1082         if (retval != 0) {
1083                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1084                 return retval;
1085         }
1086
1087         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1088         retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);
1089         if (retval != 0) {
1090                 pr_err("dvb-core: unable register character device\n");
1091                 goto error;
1092         }
1093
1094         dvb_class = class_create("dvb");
1095         if (IS_ERR(dvb_class)) {
1096                 retval = PTR_ERR(dvb_class);
1097                 goto error;
1098         }
1099         dvb_class->dev_uevent = dvb_uevent;
1100         dvb_class->devnode = dvb_devnode;
1101         return 0;
1102
1103 error:
1104         cdev_del(&dvb_device_cdev);
1105         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1106         return retval;
1107 }
1108
1109 static void __exit exit_dvbdev(void)
1110 {
1111         struct dvbdevfops_node *node, *next;
1112
1113         class_destroy(dvb_class);
1114         cdev_del(&dvb_device_cdev);
1115         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1116
1117         list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1118                 list_del(&node->list_head);
1119                 kfree(node->fops);
1120                 kfree(node);
1121         }
1122 }
1123
1124 subsys_initcall(init_dvbdev);
1125 module_exit(exit_dvbdev);
1126
1127 MODULE_DESCRIPTION("DVB Core Driver");
1128 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1129 MODULE_LICENSE("GPL");