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