drivers/media/dvb-core/dvbdev.c

   1 /*
   2  * dvbdev.c
   3  *
   4  * Copyright (C) 2000 Ralph  Metzler <[email protected]>
   5  *                  & Marcus Metzler <[email protected]>
   6  *                    for convergence integrated media GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #define pr_fmt(fmt) "dvbdev: " fmt
  21
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/string.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/i2c.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/device.h>
  31 #include <linux/fs.h>
  32 #include <linux/cdev.h>
  33 #include <linux/mutex.h>
  34 #include <media/dvbdev.h>
  35
  36 /* Due to enum tuner_pad_index */
  37 #include <media/tuner.h>
  38
  39 static DEFINE_MUTEX(dvbdev_mutex);
  40 static int dvbdev_debug;
  41
  42 module_param(dvbdev_debug, int, 0644);
  43 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  44
  45 #define dprintk(fmt, arg...) do {                                       \
  46         if (dvbdev_debug)                                               \
  47                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  48                        __func__, ##arg);                                \
  49 } while (0)
  50
  51 static LIST_HEAD(dvb_adapter_list);
  52 static DEFINE_MUTEX(dvbdev_register_lock);
  53
  54 static const char * const dnames[] = {
  55         [DVB_DEVICE_VIDEO] =            "video",
  56         [DVB_DEVICE_AUDIO] =            "audio",
  57         [DVB_DEVICE_SEC] =              "sec",
  58         [DVB_DEVICE_FRONTEND] =         "frontend",
  59         [DVB_DEVICE_DEMUX] =            "demux",
  60         [DVB_DEVICE_DVR] =              "dvr",
  61         [DVB_DEVICE_CA] =               "ca",
  62         [DVB_DEVICE_NET] =              "net",
  63         [DVB_DEVICE_OSD] =              "osd"
  64 };
  65
  66 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  67 #define MAX_DVB_MINORS          256
  68 #define DVB_MAX_IDS             MAX_DVB_MINORS
  69 #else
  70 #define DVB_MAX_IDS             4
  71
  72 static const u8 minor_type[] = {
  73        [DVB_DEVICE_VIDEO]      = 0,
  74        [DVB_DEVICE_AUDIO]      = 1,
  75        [DVB_DEVICE_SEC]        = 2,
  76        [DVB_DEVICE_FRONTEND]   = 3,
  77        [DVB_DEVICE_DEMUX]      = 4,
  78        [DVB_DEVICE_DVR]        = 5,
  79        [DVB_DEVICE_CA]         = 6,
  80        [DVB_DEVICE_NET]        = 7,
  81        [DVB_DEVICE_OSD]        = 8,
  82 };
  83
  84 #define nums2minor(num, type, id) \
  85        (((num) << 6) | ((id) << 4) | minor_type[type])
  86
  87 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  88 #endif
  89
  90 static struct class *dvb_class;
  91
  92 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  93 static DECLARE_RWSEM(minor_rwsem);
  94
  95 static int dvb_device_open(struct inode *inode, struct file *file)
  96 {
  97         struct dvb_device *dvbdev;
  98
  99         mutex_lock(&dvbdev_mutex);
 100         down_read(&minor_rwsem);
 101         dvbdev = dvb_minors[iminor(inode)];
 102
 103         if (dvbdev && dvbdev->fops) {
 104                 int err = 0;
 105                 const struct file_operations *new_fops;
 106
 107                 new_fops = fops_get(dvbdev->fops);
 108                 if (!new_fops)
 109                         goto fail;
 110                 file->private_data = dvbdev;
 111                 replace_fops(file, new_fops);
 112                 if (file->f_op->open)
 113                         err = file->f_op->open(inode, file);
 114                 up_read(&minor_rwsem);
 115                 mutex_unlock(&dvbdev_mutex);
 116                 return err;
 117         }
 118 fail:
 119         up_read(&minor_rwsem);
 120         mutex_unlock(&dvbdev_mutex);
 121         return -ENODEV;
 122 }
 123
 124
 125 static const struct file_operations dvb_device_fops =
 126 {
 127         .owner =        THIS_MODULE,
 128         .open =         dvb_device_open,
 129         .llseek =       noop_llseek,
 130 };
 131
 132 static struct cdev dvb_device_cdev;
 133
 134 int dvb_generic_open(struct inode *inode, struct file *file)
 135 {
 136         struct dvb_device *dvbdev = file->private_data;
 137
 138         if (!dvbdev)
 139                 return -ENODEV;
 140
 141         if (!dvbdev->users)
 142                 return -EBUSY;
 143
 144         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 145                 if (!dvbdev->readers)
 146                         return -EBUSY;
 147                 dvbdev->readers--;
 148         } else {
 149                 if (!dvbdev->writers)
 150                         return -EBUSY;
 151                 dvbdev->writers--;
 152         }
 153
 154         dvbdev->users--;
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(dvb_generic_open);
 158
 159
 160 int dvb_generic_release(struct inode *inode, struct file *file)
 161 {
 162         struct dvb_device *dvbdev = file->private_data;
 163
 164         if (!dvbdev)
 165                 return -ENODEV;
 166
 167         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 168                 dvbdev->readers++;
 169         } else {
 170                 dvbdev->writers++;
 171         }
 172
 173         dvbdev->users++;
 174         return 0;
 175 }
 176 EXPORT_SYMBOL(dvb_generic_release);
 177
 178
 179 long dvb_generic_ioctl(struct file *file,
 180                        unsigned int cmd, unsigned long arg)
 181 {
 182         struct dvb_device *dvbdev = file->private_data;
 183
 184         if (!dvbdev)
 185                 return -ENODEV;
 186
 187         if (!dvbdev->kernel_ioctl)
 188                 return -EINVAL;
 189
 190         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 191 }
 192 EXPORT_SYMBOL(dvb_generic_ioctl);
 193
 194
 195 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 196 {
 197         u32 id = 0;
 198
 199         while (id < DVB_MAX_IDS) {
 200                 struct dvb_device *dev;
 201                 list_for_each_entry(dev, &adap->device_list, list_head)
 202                         if (dev->type == type && dev->id == id)
 203                                 goto skip;
 204                 return id;
 205 skip:
 206                 id++;
 207         }
 208         return -ENFILE;
 209 }
 210
 211 static void dvb_media_device_free(struct dvb_device *dvbdev)
 212 {
 213 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 214         if (dvbdev->entity) {
 215                 media_device_unregister_entity(dvbdev->entity);
 216                 kfree(dvbdev->entity);
 217                 kfree(dvbdev->pads);
 218                 dvbdev->entity = NULL;
 219                 dvbdev->pads = NULL;
 220         }
 221
 222         if (dvbdev->tsout_entity) {
 223                 int i;
 224
 225                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 226                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 227                         kfree(dvbdev->tsout_entity[i].name);
 228                 }
 229                 kfree(dvbdev->tsout_entity);
 230                 kfree(dvbdev->tsout_pads);
 231                 dvbdev->tsout_entity = NULL;
 232                 dvbdev->tsout_pads = NULL;
 233
 234                 dvbdev->tsout_num_entities = 0;
 235         }
 236
 237         if (dvbdev->intf_devnode) {
 238                 media_devnode_remove(dvbdev->intf_devnode);
 239                 dvbdev->intf_devnode = NULL;
 240         }
 241
 242         if (dvbdev->adapter->conn) {
 243                 media_device_unregister_entity(dvbdev->adapter->conn);
 244                 dvbdev->adapter->conn = NULL;
 245                 kfree(dvbdev->adapter->conn_pads);
 246                 dvbdev->adapter->conn_pads = NULL;
 247         }
 248 #endif
 249 }
 250
 251 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 252 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 253                                     const char *name, int npads)
 254 {
 255         int i, ret = 0;
 256
 257         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 258                                      GFP_KERNEL);
 259         if (!dvbdev->tsout_pads)
 260                 return -ENOMEM;
 261
 262         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 263                                        GFP_KERNEL);
 264         if (!dvbdev->tsout_entity)
 265                 return -ENOMEM;
 266
 267         dvbdev->tsout_num_entities = npads;
 268
 269         for (i = 0; i < npads; i++) {
 270                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 271                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 272
 273                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 274                 if (!entity->name)
 275                         return -ENOMEM;
 276
 277                 entity->function = MEDIA_ENT_F_IO_DTV;
 278                 pads->flags = MEDIA_PAD_FL_SINK;
 279
 280                 ret = media_entity_pads_init(entity, 1, pads);
 281                 if (ret < 0)
 282                         return ret;
 283
 284                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 285                                                    entity);
 286                 if (ret < 0)
 287                         return ret;
 288         }
 289         return 0;
 290 }
 291
 292 #define DEMUX_TSOUT     "demux-tsout"
 293 #define DVR_TSOUT       "dvr-tsout"
 294
 295 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 296                                    int type, int demux_sink_pads)
 297 {
 298         int i, ret, npads;
 299
 300         switch (type) {
 301         case DVB_DEVICE_FRONTEND:
 302                 npads = 2;
 303                 break;
 304         case DVB_DEVICE_DVR:
 305                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 306                                               demux_sink_pads);
 307                 return ret;
 308         case DVB_DEVICE_DEMUX:
 309                 npads = 1 + demux_sink_pads;
 310                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 311                                               demux_sink_pads);
 312                 if (ret < 0)
 313                         return ret;
 314                 break;
 315         case DVB_DEVICE_CA:
 316                 npads = 2;
 317                 break;
 318         case DVB_DEVICE_NET:
 319                 /*
 320                  * We should be creating entities for the MPE/ULE
 321                  * decapsulation hardware (or software implementation).
 322                  *
 323                  * However, the number of for the MPE/ULE decaps may not be
 324                  * fixed. As we don't have yet dynamic support for PADs at
 325                  * the Media Controller, let's not create the decap
 326                  * entities yet.
 327                  */
 328                 return 0;
 329         default:
 330                 return 0;
 331         }
 332
 333         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 334         if (!dvbdev->entity)
 335                 return -ENOMEM;
 336
 337         dvbdev->entity->name = dvbdev->name;
 338
 339         if (npads) {
 340                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 341                                        GFP_KERNEL);
 342                 if (!dvbdev->pads)
 343                         return -ENOMEM;
 344         }
 345
 346         switch (type) {
 347         case DVB_DEVICE_FRONTEND:
 348                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 349                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 350                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 351                 break;
 352         case DVB_DEVICE_DEMUX:
 353                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 354                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 355                 for (i = 1; i < npads; i++)
 356                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 357                 break;
 358         case DVB_DEVICE_CA:
 359                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 360                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 361                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 362                 break;
 363         default:
 364                 /* Should never happen, as the first switch prevents it */
 365                 kfree(dvbdev->entity);
 366                 kfree(dvbdev->pads);
 367                 dvbdev->entity = NULL;
 368                 dvbdev->pads = NULL;
 369                 return 0;
 370         }
 371
 372         if (npads) {
 373                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 374                 if (ret)
 375                         return ret;
 376         }
 377         ret = media_device_register_entity(dvbdev->adapter->mdev,
 378                                            dvbdev->entity);
 379         if (ret)
 380                 return ret;
 381
 382         pr_info("%s: media entity '%s' registered.\n",
 383                 __func__, dvbdev->entity->name);
 384
 385         return 0;
 386 }
 387 #endif
 388
 389 static int dvb_register_media_device(struct dvb_device *dvbdev,
 390                                      int type, int minor,
 391                                      unsigned demux_sink_pads)
 392 {
 393 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 394         struct media_link *link;
 395         u32 intf_type;
 396         int ret;
 397
 398         if (!dvbdev->adapter->mdev)
 399                 return 0;
 400
 401         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 402         if (ret)
 403                 return ret;
 404
 405         switch (type) {
 406         case DVB_DEVICE_FRONTEND:
 407                 intf_type = MEDIA_INTF_T_DVB_FE;
 408                 break;
 409         case DVB_DEVICE_DEMUX:
 410                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 411                 break;
 412         case DVB_DEVICE_DVR:
 413                 intf_type = MEDIA_INTF_T_DVB_DVR;
 414                 break;
 415         case DVB_DEVICE_CA:
 416                 intf_type = MEDIA_INTF_T_DVB_CA;
 417                 break;
 418         case DVB_DEVICE_NET:
 419                 intf_type = MEDIA_INTF_T_DVB_NET;
 420                 break;
 421         default:
 422                 return 0;
 423         }
 424
 425         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 426                                                     intf_type, 0,
 427                                                     DVB_MAJOR, minor);
 428
 429         if (!dvbdev->intf_devnode)
 430                 return -ENOMEM;
 431
 432         /*
 433          * Create the "obvious" link, e. g. the ones that represent
 434          * a direct association between an interface and an entity.
 435          * Other links should be created elsewhere, like:
 436          *              DVB FE intf    -> tuner
 437          *              DVB demux intf -> dvr
 438          */
 439
 440         if (!dvbdev->entity)
 441                 return 0;
 442
 443         link = media_create_intf_link(dvbdev->entity,
 444                                       &dvbdev->intf_devnode->intf,
 445                                       MEDIA_LNK_FL_ENABLED |
 446                                       MEDIA_LNK_FL_IMMUTABLE);
 447         if (!link)
 448                 return -ENOMEM;
 449 #endif
 450         return 0;
 451 }
 452
 453 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 454                         const struct dvb_device *template, void *priv,
 455                         enum dvb_device_type type, int demux_sink_pads)
 456 {
 457         struct dvb_device *dvbdev;
 458         struct file_operations *dvbdevfops;
 459         struct device *clsdev;
 460         int minor;
 461         int id, ret;
 462
 463         mutex_lock(&dvbdev_register_lock);
 464
 465         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 466                 mutex_unlock(&dvbdev_register_lock);
 467                 *pdvbdev = NULL;
 468                 pr_err("%s: couldn't find free device id\n", __func__);
 469                 return -ENFILE;
 470         }
 471
 472         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 473
 474         if (!dvbdev){
 475                 mutex_unlock(&dvbdev_register_lock);
 476                 return -ENOMEM;
 477         }
 478
 479         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 480
 481         if (!dvbdevfops){
 482                 kfree (dvbdev);
 483                 mutex_unlock(&dvbdev_register_lock);
 484                 return -ENOMEM;
 485         }
 486
 487         memcpy(dvbdev, template, sizeof(struct dvb_device));
 488         dvbdev->type = type;
 489         dvbdev->id = id;
 490         dvbdev->adapter = adap;
 491         dvbdev->priv = priv;
 492         dvbdev->fops = dvbdevfops;
 493         init_waitqueue_head (&dvbdev->wait_queue);
 494
 495         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 496         dvbdevfops->owner = adap->module;
 497
 498         list_add_tail (&dvbdev->list_head, &adap->device_list);
 499
 500         down_write(&minor_rwsem);
 501 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 502         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 503                 if (dvb_minors[minor] == NULL)
 504                         break;
 505
 506         if (minor == MAX_DVB_MINORS) {
 507                 kfree(dvbdevfops);
 508                 kfree(dvbdev);
 509                 up_write(&minor_rwsem);
 510                 mutex_unlock(&dvbdev_register_lock);
 511                 return -EINVAL;
 512         }
 513 #else
 514         minor = nums2minor(adap->num, type, id);
 515 #endif
 516
 517         dvbdev->minor = minor;
 518         dvb_minors[minor] = dvbdev;
 519         up_write(&minor_rwsem);
 520
 521         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 522         if (ret) {
 523                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 524                       __func__);
 525
 526                 dvb_media_device_free(dvbdev);
 527                 kfree(dvbdevfops);
 528                 kfree(dvbdev);
 529                 mutex_unlock(&dvbdev_register_lock);
 530                 return ret;
 531         }
 532
 533         mutex_unlock(&dvbdev_register_lock);
 534
 535         clsdev = device_create(dvb_class, adap->device,
 536                                MKDEV(DVB_MAJOR, minor),
 537                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 538         if (IS_ERR(clsdev)) {
 539                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 540                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 541                 return PTR_ERR(clsdev);
 542         }
 543         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 544                 adap->num, dnames[type], id, minor, minor);
 545
 546         return 0;
 547 }
 548 EXPORT_SYMBOL(dvb_register_device);
 549
 550
 551 void dvb_remove_device(struct dvb_device *dvbdev)
 552 {
 553         if (!dvbdev)
 554                 return;
 555
 556         down_write(&minor_rwsem);
 557         dvb_minors[dvbdev->minor] = NULL;
 558         up_write(&minor_rwsem);
 559
 560         dvb_media_device_free(dvbdev);
 561
 562         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 563
 564         list_del (&dvbdev->list_head);
 565 }
 566 EXPORT_SYMBOL(dvb_remove_device);
 567
 568
 569 void dvb_free_device(struct dvb_device *dvbdev)
 570 {
 571         if (!dvbdev)
 572                 return;
 573
 574         kfree (dvbdev->fops);
 575         kfree (dvbdev);
 576 }
 577 EXPORT_SYMBOL(dvb_free_device);
 578
 579
 580 void dvb_unregister_device(struct dvb_device *dvbdev)
 581 {
 582         dvb_remove_device(dvbdev);
 583         dvb_free_device(dvbdev);
 584 }
 585 EXPORT_SYMBOL(dvb_unregister_device);
 586
 587
 588 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 589
 590 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 591                                     struct media_interface *intf,
 592                                     char *name)
 593 {
 594         struct media_device *mdev = adap->mdev;
 595         struct media_entity *entity;
 596         struct media_link *link;
 597
 598         media_device_for_each_entity(entity, mdev) {
 599                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 600                         if (strncmp(entity->name, name, strlen(name)))
 601                                 continue;
 602                         link = media_create_intf_link(entity, intf,
 603                                                       MEDIA_LNK_FL_ENABLED |
 604                                                       MEDIA_LNK_FL_IMMUTABLE);
 605                         if (!link)
 606                                 return -ENOMEM;
 607                 }
 608         }
 609         return 0;
 610 }
 611
 612 int dvb_create_media_graph(struct dvb_adapter *adap,
 613                            bool create_rf_connector)
 614 {
 615         struct media_device *mdev = adap->mdev;
 616         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 617         struct media_entity *demux = NULL, *ca = NULL;
 618         struct media_link *link;
 619         struct media_interface *intf;
 620         unsigned demux_pad = 0;
 621         unsigned dvr_pad = 0;
 622         unsigned ntuner = 0, ndemod = 0;
 623         int ret, pad_source, pad_sink;
 624         static const char *connector_name = "Television";
 625
 626         if (!mdev)
 627                 return 0;
 628
 629         media_device_for_each_entity(entity, mdev) {
 630                 switch (entity->function) {
 631                 case MEDIA_ENT_F_TUNER:
 632                         tuner = entity;
 633                         ntuner++;
 634                         break;
 635                 case MEDIA_ENT_F_DTV_DEMOD:
 636                         demod = entity;
 637                         ndemod++;
 638                         break;
 639                 case MEDIA_ENT_F_TS_DEMUX:
 640                         demux = entity;
 641                         break;
 642                 case MEDIA_ENT_F_DTV_CA:
 643                         ca = entity;
 644                         break;
 645                 }
 646         }
 647
 648         /*
 649          * Prepare to signalize to media_create_pad_links() that multiple
 650          * entities of the same type exists and a 1:n or n:1 links need to be
 651          * created.
 652          * NOTE: if both tuner and demod have multiple instances, it is up
 653          * to the caller driver to create such links.
 654          */
 655         if (ntuner > 1)
 656                 tuner = NULL;
 657         if (ndemod > 1)
 658                 demod = NULL;
 659
 660         if (create_rf_connector) {
 661                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 662                 if (!conn)
 663                         return -ENOMEM;
 664                 adap->conn = conn;
 665
 666                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 667                 if (!adap->conn_pads)
 668                         return -ENOMEM;
 669
 670                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 671                 conn->function = MEDIA_ENT_F_CONN_RF;
 672                 conn->name = connector_name;
 673                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 674
 675                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 676                 if (ret)
 677                         return ret;
 678
 679                 ret = media_device_register_entity(mdev, conn);
 680                 if (ret)
 681                         return ret;
 682
 683                 if (!ntuner) {
 684                         ret = media_create_pad_links(mdev,
 685                                                      MEDIA_ENT_F_CONN_RF,
 686                                                      conn, 0,
 687                                                      MEDIA_ENT_F_DTV_DEMOD,
 688                                                      demod, 0,
 689                                                      MEDIA_LNK_FL_ENABLED,
 690                                                      false);
 691                 } else {
 692                         pad_sink = media_get_pad_index(tuner, true,
 693                                                        PAD_SIGNAL_ANALOG);
 694                         if (pad_sink < 0)
 695                                 return -EINVAL;
 696                         ret = media_create_pad_links(mdev,
 697                                                      MEDIA_ENT_F_CONN_RF,
 698                                                      conn, 0,
 699                                                      MEDIA_ENT_F_TUNER,
 700                                                      tuner, pad_sink,
 701                                                      MEDIA_LNK_FL_ENABLED,
 702                                                      false);
 703                 }
 704                 if (ret)
 705                         return ret;
 706         }
 707
 708         if (ntuner && ndemod) {
 709                 pad_source = media_get_pad_index(tuner, true,
 710                                                  PAD_SIGNAL_ANALOG);
 711                 if (pad_source)
 712                         return -EINVAL;
 713                 ret = media_create_pad_links(mdev,
 714                                              MEDIA_ENT_F_TUNER,
 715                                              tuner, pad_source,
 716                                              MEDIA_ENT_F_DTV_DEMOD,
 717                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 718                                              false);
 719                 if (ret)
 720                         return ret;
 721         }
 722
 723         if (ndemod && demux) {
 724                 ret = media_create_pad_links(mdev,
 725                                              MEDIA_ENT_F_DTV_DEMOD,
 726                                              demod, 1,
 727                                              MEDIA_ENT_F_TS_DEMUX,
 728                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 729                                              false);
 730                 if (ret)
 731                         return ret;
 732         }
 733         if (demux && ca) {
 734                 ret = media_create_pad_link(demux, 1, ca,
 735                                             0, MEDIA_LNK_FL_ENABLED);
 736                 if (ret)
 737                         return ret;
 738         }
 739
 740         /* Create demux links for each ringbuffer/pad */
 741         if (demux) {
 742                 media_device_for_each_entity(entity, mdev) {
 743                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 744                                 if (!strncmp(entity->name, DVR_TSOUT,
 745                                     strlen(DVR_TSOUT))) {
 746                                         ret = media_create_pad_link(demux,
 747                                                                 ++dvr_pad,
 748                                                             entity, 0, 0);
 749                                         if (ret)
 750                                                 return ret;
 751                                 }
 752                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 753                                     strlen(DEMUX_TSOUT))) {
 754                                         ret = media_create_pad_link(demux,
 755                                                               ++demux_pad,
 756                                                             entity, 0, 0);
 757                                         if (ret)
 758                                                 return ret;
 759                                 }
 760                         }
 761                 }
 762         }
 763
 764         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 765         media_device_for_each_intf(intf, mdev) {
 766                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 767                         link = media_create_intf_link(ca, intf,
 768                                                       MEDIA_LNK_FL_ENABLED |
 769                                                       MEDIA_LNK_FL_IMMUTABLE);
 770                         if (!link)
 771                                 return -ENOMEM;
 772                 }
 773
 774                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 775                         link = media_create_intf_link(tuner, intf,
 776                                                       MEDIA_LNK_FL_ENABLED |
 777                                                       MEDIA_LNK_FL_IMMUTABLE);
 778                         if (!link)
 779                                 return -ENOMEM;
 780                 }
 781 #if 0
 782                 /*
 783                  * Indirect link - let's not create yet, as we don't know how
 784                  *                 to handle indirect links, nor if this will
 785                  *                 actually be needed.
 786                  */
 787                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 788                         link = media_create_intf_link(demux, intf,
 789                                                       MEDIA_LNK_FL_ENABLED |
 790                                                       MEDIA_LNK_FL_IMMUTABLE);
 791                         if (!link)
 792                                 return -ENOMEM;
 793                 }
 794 #endif
 795                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 796                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 797                         if (ret)
 798                                 return ret;
 799                 }
 800                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 801                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 802                         if (ret)
 803                                 return ret;
 804                 }
 805         }
 806         return 0;
 807 }
 808 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 809 #endif
 810
 811 static int dvbdev_check_free_adapter_num(int num)
 812 {
 813         struct list_head *entry;
 814         list_for_each(entry, &dvb_adapter_list) {
 815                 struct dvb_adapter *adap;
 816                 adap = list_entry(entry, struct dvb_adapter, list_head);
 817                 if (adap->num == num)
 818                         return 0;
 819         }
 820         return 1;
 821 }
 822
 823 static int dvbdev_get_free_adapter_num (void)
 824 {
 825         int num = 0;
 826
 827         while (num < DVB_MAX_ADAPTERS) {
 828                 if (dvbdev_check_free_adapter_num(num))
 829                         return num;
 830                 num++;
 831         }
 832
 833         return -ENFILE;
 834 }
 835
 836
 837 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 838                          struct module *module, struct device *device,
 839                          short *adapter_nums)
 840 {
 841         int i, num;
 842
 843         mutex_lock(&dvbdev_register_lock);
 844
 845         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 846                 num = adapter_nums[i];
 847                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 848                 /* use the one the driver asked for */
 849                         if (dvbdev_check_free_adapter_num(num))
 850                                 break;
 851                 } else {
 852                         num = dvbdev_get_free_adapter_num();
 853                         break;
 854                 }
 855                 num = -1;
 856         }
 857
 858         if (num < 0) {
 859                 mutex_unlock(&dvbdev_register_lock);
 860                 return -ENFILE;
 861         }
 862
 863         memset (adap, 0, sizeof(struct dvb_adapter));
 864         INIT_LIST_HEAD (&adap->device_list);
 865
 866         pr_info("DVB: registering new adapter (%s)\n", name);
 867
 868         adap->num = num;
 869         adap->name = name;
 870         adap->module = module;
 871         adap->device = device;
 872         adap->mfe_shared = 0;
 873         adap->mfe_dvbdev = NULL;
 874         mutex_init (&adap->mfe_lock);
 875
 876 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 877         mutex_init(&adap->mdev_lock);
 878 #endif
 879
 880         list_add_tail (&adap->list_head, &dvb_adapter_list);
 881
 882         mutex_unlock(&dvbdev_register_lock);
 883
 884         return num;
 885 }
 886 EXPORT_SYMBOL(dvb_register_adapter);
 887
 888
 889 int dvb_unregister_adapter(struct dvb_adapter *adap)
 890 {
 891         mutex_lock(&dvbdev_register_lock);
 892         list_del (&adap->list_head);
 893         mutex_unlock(&dvbdev_register_lock);
 894         return 0;
 895 }
 896 EXPORT_SYMBOL(dvb_unregister_adapter);
 897
 898 /* if the miracle happens and "generic_usercopy()" is included into
 899    the kernel, then this can vanish. please don't make the mistake and
 900    define this as video_usercopy(). this will introduce a dependency
 901    to the v4l "videodev.o" module, which is unnecessary for some
 902    cards (ie. the budget dvb-cards don't need the v4l module...) */
 903 int dvb_usercopy(struct file *file,
 904                      unsigned int cmd, unsigned long arg,
 905                      int (*func)(struct file *file,
 906                      unsigned int cmd, void *arg))
 907 {
 908         char    sbuf[128];
 909         void    *mbuf = NULL;
 910         void    *parg = NULL;
 911         int     err  = -EINVAL;
 912
 913         /*  Copy arguments into temp kernel buffer  */
 914         switch (_IOC_DIR(cmd)) {
 915         case _IOC_NONE:
 916                 /*
 917                  * For this command, the pointer is actually an integer
 918                  * argument.
 919                  */
 920                 parg = (void *) arg;
 921                 break;
 922         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 923         case _IOC_WRITE:
 924         case (_IOC_WRITE | _IOC_READ):
 925                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 926                         parg = sbuf;
 927                 } else {
 928                         /* too big to allocate from stack */
 929                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 930                         if (NULL == mbuf)
 931                                 return -ENOMEM;
 932                         parg = mbuf;
 933                 }
 934
 935                 err = -EFAULT;
 936                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 937                         goto out;
 938                 break;
 939         }
 940
 941         /* call driver */
 942         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 943                 err = -ENOTTY;
 944
 945         if (err < 0)
 946                 goto out;
 947
 948         /*  Copy results into user buffer  */
 949         switch (_IOC_DIR(cmd))
 950         {
 951         case _IOC_READ:
 952         case (_IOC_WRITE | _IOC_READ):
 953                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 954                         err = -EFAULT;
 955                 break;
 956         }
 957
 958 out:
 959         kfree(mbuf);
 960         return err;
 961 }
 962
 963 #if IS_ENABLED(CONFIG_I2C)
 964 struct i2c_client *dvb_module_probe(const char *module_name,
 965                                     const char *name,
 966                                     struct i2c_adapter *adap,
 967                                     unsigned char addr,
 968                                     void *platform_data)
 969 {
 970         struct i2c_client *client;
 971         struct i2c_board_info *board_info;
 972
 973         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 974         if (!board_info)
 975                 return NULL;
 976
 977         if (name)
 978                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 979         else
 980                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
 981
 982         board_info->addr = addr;
 983         board_info->platform_data = platform_data;
 984         request_module(module_name);
 985         client = i2c_new_device(adap, board_info);
 986         if (client == NULL || client->dev.driver == NULL) {
 987                 kfree(board_info);
 988                 return NULL;
 989         }
 990
 991         if (!try_module_get(client->dev.driver->owner)) {
 992                 i2c_unregister_device(client);
 993                 client = NULL;
 994         }
 995
 996         kfree(board_info);
 997         return client;
 998 }
 999 EXPORT_SYMBOL_GPL(dvb_module_probe);
1000
1001 void dvb_module_release(struct i2c_client *client)
1002 {
1003         if (!client)
1004                 return;
1005
1006         module_put(client->dev.driver->owner);
1007         i2c_unregister_device(client);
1008 }
1009 EXPORT_SYMBOL_GPL(dvb_module_release);
1010 #endif
1011
1012 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1013 {
1014         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1015
1016         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1017         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1018         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1019         return 0;
1020 }
1021
1022 static char *dvb_devnode(struct device *dev, umode_t *mode)
1023 {
1024         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1025
1026         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1027                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1028 }
1029
1030
1031 static int __init init_dvbdev(void)
1032 {
1033         int retval;
1034         dev_t dev = MKDEV(DVB_MAJOR, 0);
1035
1036         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1037                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1038                 return retval;
1039         }
1040
1041         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1042         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1043                 pr_err("dvb-core: unable register character device\n");
1044                 goto error;
1045         }
1046
1047         dvb_class = class_create(THIS_MODULE, "dvb");
1048         if (IS_ERR(dvb_class)) {
1049                 retval = PTR_ERR(dvb_class);
1050                 goto error;
1051         }
1052         dvb_class->dev_uevent = dvb_uevent;
1053         dvb_class->devnode = dvb_devnode;
1054         return 0;
1055
1056 error:
1057         cdev_del(&dvb_device_cdev);
1058         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1059         return retval;
1060 }
1061
1062
1063 static void __exit exit_dvbdev(void)
1064 {
1065         class_destroy(dvb_class);
1066         cdev_del(&dvb_device_cdev);
1067         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1068 }
1069
1070 subsys_initcall(init_dvbdev);
1071 module_exit(exit_dvbdev);
1072
1073 MODULE_DESCRIPTION("DVB Core Driver");
1074 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1075 MODULE_LICENSE("GPL");