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                         kfree(dvbdev->entity);
 344                         return -ENOMEM;
 345                 }
 346         }
 347
 348         switch (type) {
 349         case DVB_DEVICE_FRONTEND:
 350                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 351                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 352                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 353                 break;
 354         case DVB_DEVICE_DEMUX:
 355                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 356                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 357                 for (i = 1; i < npads; i++)
 358                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 359                 break;
 360         case DVB_DEVICE_CA:
 361                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 362                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 363                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 364                 break;
 365         default:
 366                 /* Should never happen, as the first switch prevents it */
 367                 kfree(dvbdev->entity);
 368                 kfree(dvbdev->pads);
 369                 dvbdev->entity = NULL;
 370                 dvbdev->pads = NULL;
 371                 return 0;
 372         }
 373
 374         if (npads) {
 375                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 376                 if (ret)
 377                         return ret;
 378         }
 379         ret = media_device_register_entity(dvbdev->adapter->mdev,
 380                                            dvbdev->entity);
 381         if (ret)
 382                 return ret;
 383
 384         pr_info("%s: media entity '%s' registered.\n",
 385                 __func__, dvbdev->entity->name);
 386
 387         return 0;
 388 }
 389 #endif
 390
 391 static int dvb_register_media_device(struct dvb_device *dvbdev,
 392                                      int type, int minor,
 393                                      unsigned demux_sink_pads)
 394 {
 395 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 396         struct media_link *link;
 397         u32 intf_type;
 398         int ret;
 399
 400         if (!dvbdev->adapter->mdev)
 401                 return 0;
 402
 403         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 404         if (ret)
 405                 return ret;
 406
 407         switch (type) {
 408         case DVB_DEVICE_FRONTEND:
 409                 intf_type = MEDIA_INTF_T_DVB_FE;
 410                 break;
 411         case DVB_DEVICE_DEMUX:
 412                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 413                 break;
 414         case DVB_DEVICE_DVR:
 415                 intf_type = MEDIA_INTF_T_DVB_DVR;
 416                 break;
 417         case DVB_DEVICE_CA:
 418                 intf_type = MEDIA_INTF_T_DVB_CA;
 419                 break;
 420         case DVB_DEVICE_NET:
 421                 intf_type = MEDIA_INTF_T_DVB_NET;
 422                 break;
 423         default:
 424                 return 0;
 425         }
 426
 427         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 428                                                     intf_type, 0,
 429                                                     DVB_MAJOR, minor);
 430
 431         if (!dvbdev->intf_devnode)
 432                 return -ENOMEM;
 433
 434         /*
 435          * Create the "obvious" link, e. g. the ones that represent
 436          * a direct association between an interface and an entity.
 437          * Other links should be created elsewhere, like:
 438          *              DVB FE intf    -> tuner
 439          *              DVB demux intf -> dvr
 440          */
 441
 442         if (!dvbdev->entity)
 443                 return 0;
 444
 445         link = media_create_intf_link(dvbdev->entity,
 446                                       &dvbdev->intf_devnode->intf,
 447                                       MEDIA_LNK_FL_ENABLED |
 448                                       MEDIA_LNK_FL_IMMUTABLE);
 449         if (!link)
 450                 return -ENOMEM;
 451 #endif
 452         return 0;
 453 }
 454
 455 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 456                         const struct dvb_device *template, void *priv,
 457                         enum dvb_device_type type, int demux_sink_pads)
 458 {
 459         struct dvb_device *dvbdev;
 460         struct file_operations *dvbdevfops;
 461         struct device *clsdev;
 462         int minor;
 463         int id, ret;
 464
 465         mutex_lock(&dvbdev_register_lock);
 466
 467         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 468                 mutex_unlock(&dvbdev_register_lock);
 469                 *pdvbdev = NULL;
 470                 pr_err("%s: couldn't find free device id\n", __func__);
 471                 return -ENFILE;
 472         }
 473
 474         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 475
 476         if (!dvbdev){
 477                 mutex_unlock(&dvbdev_register_lock);
 478                 return -ENOMEM;
 479         }
 480
 481         dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 482
 483         if (!dvbdevfops){
 484                 kfree (dvbdev);
 485                 mutex_unlock(&dvbdev_register_lock);
 486                 return -ENOMEM;
 487         }
 488
 489         memcpy(dvbdev, template, sizeof(struct dvb_device));
 490         dvbdev->type = type;
 491         dvbdev->id = id;
 492         dvbdev->adapter = adap;
 493         dvbdev->priv = priv;
 494         dvbdev->fops = dvbdevfops;
 495         init_waitqueue_head (&dvbdev->wait_queue);
 496
 497         dvbdevfops->owner = adap->module;
 498
 499         list_add_tail (&dvbdev->list_head, &adap->device_list);
 500
 501         down_write(&minor_rwsem);
 502 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 503         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 504                 if (dvb_minors[minor] == NULL)
 505                         break;
 506
 507         if (minor == MAX_DVB_MINORS) {
 508                 kfree(dvbdevfops);
 509                 kfree(dvbdev);
 510                 up_write(&minor_rwsem);
 511                 mutex_unlock(&dvbdev_register_lock);
 512                 return -EINVAL;
 513         }
 514 #else
 515         minor = nums2minor(adap->num, type, id);
 516 #endif
 517
 518         dvbdev->minor = minor;
 519         dvb_minors[minor] = dvbdev;
 520         up_write(&minor_rwsem);
 521
 522         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 523         if (ret) {
 524                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 525                       __func__);
 526
 527                 dvb_media_device_free(dvbdev);
 528                 kfree(dvbdevfops);
 529                 kfree(dvbdev);
 530                 mutex_unlock(&dvbdev_register_lock);
 531                 return ret;
 532         }
 533
 534         mutex_unlock(&dvbdev_register_lock);
 535
 536         clsdev = device_create(dvb_class, adap->device,
 537                                MKDEV(DVB_MAJOR, minor),
 538                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 539         if (IS_ERR(clsdev)) {
 540                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 541                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 542                 return PTR_ERR(clsdev);
 543         }
 544         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 545                 adap->num, dnames[type], id, minor, minor);
 546
 547         return 0;
 548 }
 549 EXPORT_SYMBOL(dvb_register_device);
 550
 551
 552 void dvb_remove_device(struct dvb_device *dvbdev)
 553 {
 554         if (!dvbdev)
 555                 return;
 556
 557         down_write(&minor_rwsem);
 558         dvb_minors[dvbdev->minor] = NULL;
 559         up_write(&minor_rwsem);
 560
 561         dvb_media_device_free(dvbdev);
 562
 563         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 564
 565         list_del (&dvbdev->list_head);
 566 }
 567 EXPORT_SYMBOL(dvb_remove_device);
 568
 569
 570 void dvb_free_device(struct dvb_device *dvbdev)
 571 {
 572         if (!dvbdev)
 573                 return;
 574
 575         kfree (dvbdev->fops);
 576         kfree (dvbdev);
 577 }
 578 EXPORT_SYMBOL(dvb_free_device);
 579
 580
 581 void dvb_unregister_device(struct dvb_device *dvbdev)
 582 {
 583         dvb_remove_device(dvbdev);
 584         dvb_free_device(dvbdev);
 585 }
 586 EXPORT_SYMBOL(dvb_unregister_device);
 587
 588
 589 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 590
 591 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 592                                     struct media_interface *intf,
 593                                     char *name)
 594 {
 595         struct media_device *mdev = adap->mdev;
 596         struct media_entity *entity;
 597         struct media_link *link;
 598
 599         media_device_for_each_entity(entity, mdev) {
 600                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 601                         if (strncmp(entity->name, name, strlen(name)))
 602                                 continue;
 603                         link = media_create_intf_link(entity, intf,
 604                                                       MEDIA_LNK_FL_ENABLED |
 605                                                       MEDIA_LNK_FL_IMMUTABLE);
 606                         if (!link)
 607                                 return -ENOMEM;
 608                 }
 609         }
 610         return 0;
 611 }
 612
 613 int dvb_create_media_graph(struct dvb_adapter *adap,
 614                            bool create_rf_connector)
 615 {
 616         struct media_device *mdev = adap->mdev;
 617         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 618         struct media_entity *demux = NULL, *ca = NULL;
 619         struct media_link *link;
 620         struct media_interface *intf;
 621         unsigned demux_pad = 0;
 622         unsigned dvr_pad = 0;
 623         unsigned ntuner = 0, ndemod = 0;
 624         int ret, pad_source, pad_sink;
 625         static const char *connector_name = "Television";
 626
 627         if (!mdev)
 628                 return 0;
 629
 630         media_device_for_each_entity(entity, mdev) {
 631                 switch (entity->function) {
 632                 case MEDIA_ENT_F_TUNER:
 633                         tuner = entity;
 634                         ntuner++;
 635                         break;
 636                 case MEDIA_ENT_F_DTV_DEMOD:
 637                         demod = entity;
 638                         ndemod++;
 639                         break;
 640                 case MEDIA_ENT_F_TS_DEMUX:
 641                         demux = entity;
 642                         break;
 643                 case MEDIA_ENT_F_DTV_CA:
 644                         ca = entity;
 645                         break;
 646                 }
 647         }
 648
 649         /*
 650          * Prepare to signalize to media_create_pad_links() that multiple
 651          * entities of the same type exists and a 1:n or n:1 links need to be
 652          * created.
 653          * NOTE: if both tuner and demod have multiple instances, it is up
 654          * to the caller driver to create such links.
 655          */
 656         if (ntuner > 1)
 657                 tuner = NULL;
 658         if (ndemod > 1)
 659                 demod = NULL;
 660
 661         if (create_rf_connector) {
 662                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 663                 if (!conn)
 664                         return -ENOMEM;
 665                 adap->conn = conn;
 666
 667                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 668                 if (!adap->conn_pads)
 669                         return -ENOMEM;
 670
 671                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 672                 conn->function = MEDIA_ENT_F_CONN_RF;
 673                 conn->name = connector_name;
 674                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 675
 676                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 677                 if (ret)
 678                         return ret;
 679
 680                 ret = media_device_register_entity(mdev, conn);
 681                 if (ret)
 682                         return ret;
 683
 684                 if (!ntuner) {
 685                         ret = media_create_pad_links(mdev,
 686                                                      MEDIA_ENT_F_CONN_RF,
 687                                                      conn, 0,
 688                                                      MEDIA_ENT_F_DTV_DEMOD,
 689                                                      demod, 0,
 690                                                      MEDIA_LNK_FL_ENABLED,
 691                                                      false);
 692                 } else {
 693                         pad_sink = media_get_pad_index(tuner, true,
 694                                                        PAD_SIGNAL_ANALOG);
 695                         if (pad_sink < 0)
 696                                 return -EINVAL;
 697                         ret = media_create_pad_links(mdev,
 698                                                      MEDIA_ENT_F_CONN_RF,
 699                                                      conn, 0,
 700                                                      MEDIA_ENT_F_TUNER,
 701                                                      tuner, pad_sink,
 702                                                      MEDIA_LNK_FL_ENABLED,
 703                                                      false);
 704                 }
 705                 if (ret)
 706                         return ret;
 707         }
 708
 709         if (ntuner && ndemod) {
 710                 /* NOTE: first found tuner source pad presumed correct */
 711                 pad_source = media_get_pad_index(tuner, false,
 712                                                  PAD_SIGNAL_ANALOG);
 713                 if (pad_source < 0)
 714                         return -EINVAL;
 715                 ret = media_create_pad_links(mdev,
 716                                              MEDIA_ENT_F_TUNER,
 717                                              tuner, pad_source,
 718                                              MEDIA_ENT_F_DTV_DEMOD,
 719                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 720                                              false);
 721                 if (ret)
 722                         return ret;
 723         }
 724
 725         if (ndemod && demux) {
 726                 ret = media_create_pad_links(mdev,
 727                                              MEDIA_ENT_F_DTV_DEMOD,
 728                                              demod, 1,
 729                                              MEDIA_ENT_F_TS_DEMUX,
 730                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 731                                              false);
 732                 if (ret)
 733                         return ret;
 734         }
 735         if (demux && ca) {
 736                 ret = media_create_pad_link(demux, 1, ca,
 737                                             0, MEDIA_LNK_FL_ENABLED);
 738                 if (ret)
 739                         return ret;
 740         }
 741
 742         /* Create demux links for each ringbuffer/pad */
 743         if (demux) {
 744                 media_device_for_each_entity(entity, mdev) {
 745                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 746                                 if (!strncmp(entity->name, DVR_TSOUT,
 747                                     strlen(DVR_TSOUT))) {
 748                                         ret = media_create_pad_link(demux,
 749                                                                 ++dvr_pad,
 750                                                             entity, 0, 0);
 751                                         if (ret)
 752                                                 return ret;
 753                                 }
 754                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 755                                     strlen(DEMUX_TSOUT))) {
 756                                         ret = media_create_pad_link(demux,
 757                                                               ++demux_pad,
 758                                                             entity, 0, 0);
 759                                         if (ret)
 760                                                 return ret;
 761                                 }
 762                         }
 763                 }
 764         }
 765
 766         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 767         media_device_for_each_intf(intf, mdev) {
 768                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 769                         link = media_create_intf_link(ca, intf,
 770                                                       MEDIA_LNK_FL_ENABLED |
 771                                                       MEDIA_LNK_FL_IMMUTABLE);
 772                         if (!link)
 773                                 return -ENOMEM;
 774                 }
 775
 776                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 777                         link = media_create_intf_link(tuner, intf,
 778                                                       MEDIA_LNK_FL_ENABLED |
 779                                                       MEDIA_LNK_FL_IMMUTABLE);
 780                         if (!link)
 781                                 return -ENOMEM;
 782                 }
 783 #if 0
 784                 /*
 785                  * Indirect link - let's not create yet, as we don't know how
 786                  *                 to handle indirect links, nor if this will
 787                  *                 actually be needed.
 788                  */
 789                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 790                         link = media_create_intf_link(demux, intf,
 791                                                       MEDIA_LNK_FL_ENABLED |
 792                                                       MEDIA_LNK_FL_IMMUTABLE);
 793                         if (!link)
 794                                 return -ENOMEM;
 795                 }
 796 #endif
 797                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 798                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 799                         if (ret)
 800                                 return ret;
 801                 }
 802                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 803                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 804                         if (ret)
 805                                 return ret;
 806                 }
 807         }
 808         return 0;
 809 }
 810 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 811 #endif
 812
 813 static int dvbdev_check_free_adapter_num(int num)
 814 {
 815         struct list_head *entry;
 816         list_for_each(entry, &dvb_adapter_list) {
 817                 struct dvb_adapter *adap;
 818                 adap = list_entry(entry, struct dvb_adapter, list_head);
 819                 if (adap->num == num)
 820                         return 0;
 821         }
 822         return 1;
 823 }
 824
 825 static int dvbdev_get_free_adapter_num (void)
 826 {
 827         int num = 0;
 828
 829         while (num < DVB_MAX_ADAPTERS) {
 830                 if (dvbdev_check_free_adapter_num(num))
 831                         return num;
 832                 num++;
 833         }
 834
 835         return -ENFILE;
 836 }
 837
 838
 839 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 840                          struct module *module, struct device *device,
 841                          short *adapter_nums)
 842 {
 843         int i, num;
 844
 845         mutex_lock(&dvbdev_register_lock);
 846
 847         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 848                 num = adapter_nums[i];
 849                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 850                 /* use the one the driver asked for */
 851                         if (dvbdev_check_free_adapter_num(num))
 852                                 break;
 853                 } else {
 854                         num = dvbdev_get_free_adapter_num();
 855                         break;
 856                 }
 857                 num = -1;
 858         }
 859
 860         if (num < 0) {
 861                 mutex_unlock(&dvbdev_register_lock);
 862                 return -ENFILE;
 863         }
 864
 865         memset (adap, 0, sizeof(struct dvb_adapter));
 866         INIT_LIST_HEAD (&adap->device_list);
 867
 868         pr_info("DVB: registering new adapter (%s)\n", name);
 869
 870         adap->num = num;
 871         adap->name = name;
 872         adap->module = module;
 873         adap->device = device;
 874         adap->mfe_shared = 0;
 875         adap->mfe_dvbdev = NULL;
 876         mutex_init (&adap->mfe_lock);
 877
 878 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 879         mutex_init(&adap->mdev_lock);
 880 #endif
 881
 882         list_add_tail (&adap->list_head, &dvb_adapter_list);
 883
 884         mutex_unlock(&dvbdev_register_lock);
 885
 886         return num;
 887 }
 888 EXPORT_SYMBOL(dvb_register_adapter);
 889
 890
 891 int dvb_unregister_adapter(struct dvb_adapter *adap)
 892 {
 893         mutex_lock(&dvbdev_register_lock);
 894         list_del (&adap->list_head);
 895         mutex_unlock(&dvbdev_register_lock);
 896         return 0;
 897 }
 898 EXPORT_SYMBOL(dvb_unregister_adapter);
 899
 900 /* if the miracle happens and "generic_usercopy()" is included into
 901    the kernel, then this can vanish. please don't make the mistake and
 902    define this as video_usercopy(). this will introduce a dependency
 903    to the v4l "videodev.o" module, which is unnecessary for some
 904    cards (ie. the budget dvb-cards don't need the v4l module...) */
 905 int dvb_usercopy(struct file *file,
 906                      unsigned int cmd, unsigned long arg,
 907                      int (*func)(struct file *file,
 908                      unsigned int cmd, void *arg))
 909 {
 910         char    sbuf[128];
 911         void    *mbuf = NULL;
 912         void    *parg = NULL;
 913         int     err  = -EINVAL;
 914
 915         /*  Copy arguments into temp kernel buffer  */
 916         switch (_IOC_DIR(cmd)) {
 917         case _IOC_NONE:
 918                 /*
 919                  * For this command, the pointer is actually an integer
 920                  * argument.
 921                  */
 922                 parg = (void *) arg;
 923                 break;
 924         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 925         case _IOC_WRITE:
 926         case (_IOC_WRITE | _IOC_READ):
 927                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 928                         parg = sbuf;
 929                 } else {
 930                         /* too big to allocate from stack */
 931                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 932                         if (NULL == mbuf)
 933                                 return -ENOMEM;
 934                         parg = mbuf;
 935                 }
 936
 937                 err = -EFAULT;
 938                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 939                         goto out;
 940                 break;
 941         }
 942
 943         /* call driver */
 944         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 945                 err = -ENOTTY;
 946
 947         if (err < 0)
 948                 goto out;
 949
 950         /*  Copy results into user buffer  */
 951         switch (_IOC_DIR(cmd))
 952         {
 953         case _IOC_READ:
 954         case (_IOC_WRITE | _IOC_READ):
 955                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 956                         err = -EFAULT;
 957                 break;
 958         }
 959
 960 out:
 961         kfree(mbuf);
 962         return err;
 963 }
 964
 965 #if IS_ENABLED(CONFIG_I2C)
 966 struct i2c_client *dvb_module_probe(const char *module_name,
 967                                     const char *name,
 968                                     struct i2c_adapter *adap,
 969                                     unsigned char addr,
 970                                     void *platform_data)
 971 {
 972         struct i2c_client *client;
 973         struct i2c_board_info *board_info;
 974
 975         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 976         if (!board_info)
 977                 return NULL;
 978
 979         if (name)
 980                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 981         else
 982                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
 983
 984         board_info->addr = addr;
 985         board_info->platform_data = platform_data;
 986         request_module(module_name);
 987         client = i2c_new_client_device(adap, board_info);
 988         if (!i2c_client_has_driver(client)) {
 989                 kfree(board_info);
 990                 return NULL;
 991         }
 992
 993         if (!try_module_get(client->dev.driver->owner)) {
 994                 i2c_unregister_device(client);
 995                 client = NULL;
 996         }
 997
 998         kfree(board_info);
 999         return client;
1000 }
1001 EXPORT_SYMBOL_GPL(dvb_module_probe);
1002
1003 void dvb_module_release(struct i2c_client *client)
1004 {
1005         if (!client)
1006                 return;
1007
1008         module_put(client->dev.driver->owner);
1009         i2c_unregister_device(client);
1010 }
1011 EXPORT_SYMBOL_GPL(dvb_module_release);
1012 #endif
1013
1014 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1015 {
1016         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1017
1018         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1019         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1020         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1021         return 0;
1022 }
1023
1024 static char *dvb_devnode(struct device *dev, umode_t *mode)
1025 {
1026         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1027
1028         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1029                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1030 }
1031
1032
1033 static int __init init_dvbdev(void)
1034 {
1035         int retval;
1036         dev_t dev = MKDEV(DVB_MAJOR, 0);
1037
1038         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1039                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1040                 return retval;
1041         }
1042
1043         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1044         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1045                 pr_err("dvb-core: unable register character device\n");
1046                 goto error;
1047         }
1048
1049         dvb_class = class_create(THIS_MODULE, "dvb");
1050         if (IS_ERR(dvb_class)) {
1051                 retval = PTR_ERR(dvb_class);
1052                 goto error;
1053         }
1054         dvb_class->dev_uevent = dvb_uevent;
1055         dvb_class->devnode = dvb_devnode;
1056         return 0;
1057
1058 error:
1059         cdev_del(&dvb_device_cdev);
1060         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1061         return retval;
1062 }
1063
1064
1065 static void __exit exit_dvbdev(void)
1066 {
1067         class_destroy(dvb_class);
1068         cdev_del(&dvb_device_cdev);
1069         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1070 }
1071
1072 subsys_initcall(init_dvbdev);
1073 module_exit(exit_dvbdev);
1074
1075 MODULE_DESCRIPTION("DVB Core Driver");
1076 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1077 MODULE_LICENSE("GPL");