drivers/media/dvb-core/dvbdev.c

   1 /*
   2  * dvbdev.c
   3  *
   4  * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
   5  *                  & Marcus Metzler <marcus@convergence.de>
   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 = dvb_device_get(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
 175         dvb_device_put(dvbdev);
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(dvb_generic_release);
 180
 181
 182 long dvb_generic_ioctl(struct file *file,
 183                        unsigned int cmd, unsigned long arg)
 184 {
 185         struct dvb_device *dvbdev = file->private_data;
 186
 187         if (!dvbdev)
 188                 return -ENODEV;
 189
 190         if (!dvbdev->kernel_ioctl)
 191                 return -EINVAL;
 192
 193         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 194 }
 195 EXPORT_SYMBOL(dvb_generic_ioctl);
 196
 197
 198 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 199 {
 200         u32 id = 0;
 201
 202         while (id < DVB_MAX_IDS) {
 203                 struct dvb_device *dev;
 204                 list_for_each_entry(dev, &adap->device_list, list_head)
 205                         if (dev->type == type && dev->id == id)
 206                                 goto skip;
 207                 return id;
 208 skip:
 209                 id++;
 210         }
 211         return -ENFILE;
 212 }
 213
 214 static void dvb_media_device_free(struct dvb_device *dvbdev)
 215 {
 216 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 217         if (dvbdev->entity) {
 218                 media_device_unregister_entity(dvbdev->entity);
 219                 kfree(dvbdev->entity);
 220                 kfree(dvbdev->pads);
 221                 dvbdev->entity = NULL;
 222                 dvbdev->pads = NULL;
 223         }
 224
 225         if (dvbdev->tsout_entity) {
 226                 int i;
 227
 228                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 229                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 230                         kfree(dvbdev->tsout_entity[i].name);
 231                 }
 232                 kfree(dvbdev->tsout_entity);
 233                 kfree(dvbdev->tsout_pads);
 234                 dvbdev->tsout_entity = NULL;
 235                 dvbdev->tsout_pads = NULL;
 236
 237                 dvbdev->tsout_num_entities = 0;
 238         }
 239
 240         if (dvbdev->intf_devnode) {
 241                 media_devnode_remove(dvbdev->intf_devnode);
 242                 dvbdev->intf_devnode = NULL;
 243         }
 244
 245         if (dvbdev->adapter->conn) {
 246                 media_device_unregister_entity(dvbdev->adapter->conn);
 247                 kfree(dvbdev->adapter->conn);
 248                 dvbdev->adapter->conn = NULL;
 249                 kfree(dvbdev->adapter->conn_pads);
 250                 dvbdev->adapter->conn_pads = NULL;
 251         }
 252 #endif
 253 }
 254
 255 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 256 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 257                                     const char *name, int npads)
 258 {
 259         int i, ret = 0;
 260
 261         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 262                                      GFP_KERNEL);
 263         if (!dvbdev->tsout_pads)
 264                 return -ENOMEM;
 265
 266         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 267                                        GFP_KERNEL);
 268         if (!dvbdev->tsout_entity)
 269                 return -ENOMEM;
 270
 271         dvbdev->tsout_num_entities = npads;
 272
 273         for (i = 0; i < npads; i++) {
 274                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 275                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 276
 277                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 278                 if (!entity->name)
 279                         return -ENOMEM;
 280
 281                 entity->function = MEDIA_ENT_F_IO_DTV;
 282                 pads->flags = MEDIA_PAD_FL_SINK;
 283
 284                 ret = media_entity_pads_init(entity, 1, pads);
 285                 if (ret < 0)
 286                         return ret;
 287
 288                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 289                                                    entity);
 290                 if (ret < 0)
 291                         return ret;
 292         }
 293         return 0;
 294 }
 295
 296 #define DEMUX_TSOUT     "demux-tsout"
 297 #define DVR_TSOUT       "dvr-tsout"
 298
 299 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 300                                    int type, int demux_sink_pads)
 301 {
 302         int i, ret, npads;
 303
 304         switch (type) {
 305         case DVB_DEVICE_FRONTEND:
 306                 npads = 2;
 307                 break;
 308         case DVB_DEVICE_DVR:
 309                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 310                                               demux_sink_pads);
 311                 return ret;
 312         case DVB_DEVICE_DEMUX:
 313                 npads = 1 + demux_sink_pads;
 314                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 315                                               demux_sink_pads);
 316                 if (ret < 0)
 317                         return ret;
 318                 break;
 319         case DVB_DEVICE_CA:
 320                 npads = 2;
 321                 break;
 322         case DVB_DEVICE_NET:
 323                 /*
 324                  * We should be creating entities for the MPE/ULE
 325                  * decapsulation hardware (or software implementation).
 326                  *
 327                  * However, the number of for the MPE/ULE decaps may not be
 328                  * fixed. As we don't have yet dynamic support for PADs at
 329                  * the Media Controller, let's not create the decap
 330                  * entities yet.
 331                  */
 332                 return 0;
 333         default:
 334                 return 0;
 335         }
 336
 337         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 338         if (!dvbdev->entity)
 339                 return -ENOMEM;
 340
 341         dvbdev->entity->name = dvbdev->name;
 342
 343         if (npads) {
 344                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 345                                        GFP_KERNEL);
 346                 if (!dvbdev->pads) {
 347                         kfree(dvbdev->entity);
 348                         dvbdev->entity = NULL;
 349                         return -ENOMEM;
 350                 }
 351         }
 352
 353         switch (type) {
 354         case DVB_DEVICE_FRONTEND:
 355                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 356                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 357                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 358                 break;
 359         case DVB_DEVICE_DEMUX:
 360                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 361                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 362                 for (i = 1; i < npads; i++)
 363                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 364                 break;
 365         case DVB_DEVICE_CA:
 366                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 367                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 368                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 369                 break;
 370         default:
 371                 /* Should never happen, as the first switch prevents it */
 372                 kfree(dvbdev->entity);
 373                 kfree(dvbdev->pads);
 374                 dvbdev->entity = NULL;
 375                 dvbdev->pads = NULL;
 376                 return 0;
 377         }
 378
 379         if (npads) {
 380                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 381                 if (ret)
 382                         return ret;
 383         }
 384         ret = media_device_register_entity(dvbdev->adapter->mdev,
 385                                            dvbdev->entity);
 386         if (ret)
 387                 return ret;
 388
 389         pr_info("%s: media entity '%s' registered.\n",
 390                 __func__, dvbdev->entity->name);
 391
 392         return 0;
 393 }
 394 #endif
 395
 396 static int dvb_register_media_device(struct dvb_device *dvbdev,
 397                                      int type, int minor,
 398                                      unsigned demux_sink_pads)
 399 {
 400 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 401         struct media_link *link;
 402         u32 intf_type;
 403         int ret;
 404
 405         if (!dvbdev->adapter->mdev)
 406                 return 0;
 407
 408         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 409         if (ret)
 410                 return ret;
 411
 412         switch (type) {
 413         case DVB_DEVICE_FRONTEND:
 414                 intf_type = MEDIA_INTF_T_DVB_FE;
 415                 break;
 416         case DVB_DEVICE_DEMUX:
 417                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 418                 break;
 419         case DVB_DEVICE_DVR:
 420                 intf_type = MEDIA_INTF_T_DVB_DVR;
 421                 break;
 422         case DVB_DEVICE_CA:
 423                 intf_type = MEDIA_INTF_T_DVB_CA;
 424                 break;
 425         case DVB_DEVICE_NET:
 426                 intf_type = MEDIA_INTF_T_DVB_NET;
 427                 break;
 428         default:
 429                 return 0;
 430         }
 431
 432         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 433                                                     intf_type, 0,
 434                                                     DVB_MAJOR, minor);
 435
 436         if (!dvbdev->intf_devnode)
 437                 return -ENOMEM;
 438
 439         /*
 440          * Create the "obvious" link, e. g. the ones that represent
 441          * a direct association between an interface and an entity.
 442          * Other links should be created elsewhere, like:
 443          *              DVB FE intf    -> tuner
 444          *              DVB demux intf -> dvr
 445          */
 446
 447         if (!dvbdev->entity)
 448                 return 0;
 449
 450         link = media_create_intf_link(dvbdev->entity,
 451                                       &dvbdev->intf_devnode->intf,
 452                                       MEDIA_LNK_FL_ENABLED |
 453                                       MEDIA_LNK_FL_IMMUTABLE);
 454         if (!link)
 455                 return -ENOMEM;
 456 #endif
 457         return 0;
 458 }
 459
 460 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 461                         const struct dvb_device *template, void *priv,
 462                         enum dvb_device_type type, int demux_sink_pads)
 463 {
 464         struct dvb_device *dvbdev;
 465         struct file_operations *dvbdevfops;
 466         struct device *clsdev;
 467         int minor;
 468         int id, ret;
 469
 470         mutex_lock(&dvbdev_register_lock);
 471
 472         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 473                 mutex_unlock(&dvbdev_register_lock);
 474                 *pdvbdev = NULL;
 475                 pr_err("%s: couldn't find free device id\n", __func__);
 476                 return -ENFILE;
 477         }
 478
 479         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 480
 481         if (!dvbdev){
 482                 mutex_unlock(&dvbdev_register_lock);
 483                 return -ENOMEM;
 484         }
 485
 486         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 487
 488         if (!dvbdevfops){
 489                 kfree (dvbdev);
 490                 mutex_unlock(&dvbdev_register_lock);
 491                 return -ENOMEM;
 492         }
 493
 494         memcpy(dvbdev, template, sizeof(struct dvb_device));
 495         kref_init(&dvbdev->ref);
 496         dvbdev->type = type;
 497         dvbdev->id = id;
 498         dvbdev->adapter = adap;
 499         dvbdev->priv = priv;
 500         dvbdev->fops = dvbdevfops;
 501         init_waitqueue_head (&dvbdev->wait_queue);
 502
 503         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 504         dvbdevfops->owner = adap->module;
 505
 506         list_add_tail (&dvbdev->list_head, &adap->device_list);
 507
 508         down_write(&minor_rwsem);
 509 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 510         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 511                 if (dvb_minors[minor] == NULL)
 512                         break;
 513
 514         if (minor == MAX_DVB_MINORS) {
 515                 kfree(dvbdevfops);
 516                 kfree(dvbdev);
 517                 up_write(&minor_rwsem);
 518                 mutex_unlock(&dvbdev_register_lock);
 519                 return -EINVAL;
 520         }
 521 #else
 522         minor = nums2minor(adap->num, type, id);
 523 #endif
 524
 525         dvbdev->minor = minor;
 526         dvb_minors[minor] = dvb_device_get(dvbdev);
 527         up_write(&minor_rwsem);
 528
 529         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 530         if (ret) {
 531                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 532                       __func__);
 533
 534                 dvb_media_device_free(dvbdev);
 535                 kfree(dvbdevfops);
 536                 kfree(dvbdev);
 537                 up_write(&minor_rwsem);
 538                 mutex_unlock(&dvbdev_register_lock);
 539                 return ret;
 540         }
 541
 542         mutex_unlock(&dvbdev_register_lock);
 543
 544         clsdev = device_create(dvb_class, adap->device,
 545                                MKDEV(DVB_MAJOR, minor),
 546                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 547         if (IS_ERR(clsdev)) {
 548                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 549                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 550                 return PTR_ERR(clsdev);
 551         }
 552         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 553                 adap->num, dnames[type], id, minor, minor);
 554
 555         return 0;
 556 }
 557 EXPORT_SYMBOL(dvb_register_device);
 558
 559
 560 void dvb_remove_device(struct dvb_device *dvbdev)
 561 {
 562         if (!dvbdev)
 563                 return;
 564
 565         down_write(&minor_rwsem);
 566         dvb_minors[dvbdev->minor] = NULL;
 567         dvb_device_put(dvbdev);
 568         up_write(&minor_rwsem);
 569
 570         dvb_media_device_free(dvbdev);
 571
 572         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 573
 574         list_del (&dvbdev->list_head);
 575 }
 576 EXPORT_SYMBOL(dvb_remove_device);
 577
 578
 579 static void dvb_free_device(struct kref *ref)
 580 {
 581         struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
 582
 583         kfree (dvbdev->fops);
 584         kfree (dvbdev);
 585 }
 586
 587
 588 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
 589 {
 590         kref_get(&dvbdev->ref);
 591         return dvbdev;
 592 }
 593 EXPORT_SYMBOL(dvb_device_get);
 594
 595
 596 void dvb_device_put(struct dvb_device *dvbdev)
 597 {
 598         if (dvbdev)
 599                 kref_put(&dvbdev->ref, dvb_free_device);
 600 }
 601
 602
 603 void dvb_unregister_device(struct dvb_device *dvbdev)
 604 {
 605         dvb_remove_device(dvbdev);
 606         dvb_device_put(dvbdev);
 607 }
 608 EXPORT_SYMBOL(dvb_unregister_device);
 609
 610
 611 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 612
 613 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 614                                     struct media_interface *intf,
 615                                     char *name)
 616 {
 617         struct media_device *mdev = adap->mdev;
 618         struct media_entity *entity;
 619         struct media_link *link;
 620
 621         media_device_for_each_entity(entity, mdev) {
 622                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 623                         if (strncmp(entity->name, name, strlen(name)))
 624                                 continue;
 625                         link = media_create_intf_link(entity, intf,
 626                                                       MEDIA_LNK_FL_ENABLED |
 627                                                       MEDIA_LNK_FL_IMMUTABLE);
 628                         if (!link)
 629                                 return -ENOMEM;
 630                 }
 631         }
 632         return 0;
 633 }
 634
 635 int dvb_create_media_graph(struct dvb_adapter *adap,
 636                            bool create_rf_connector)
 637 {
 638         struct media_device *mdev = adap->mdev;
 639         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 640         struct media_entity *demux = NULL, *ca = NULL;
 641         struct media_link *link;
 642         struct media_interface *intf;
 643         unsigned demux_pad = 0;
 644         unsigned dvr_pad = 0;
 645         unsigned ntuner = 0, ndemod = 0;
 646         int ret;
 647         static const char *connector_name = "Television";
 648
 649         if (!mdev)
 650                 return 0;
 651
 652         media_device_for_each_entity(entity, mdev) {
 653                 switch (entity->function) {
 654                 case MEDIA_ENT_F_TUNER:
 655                         tuner = entity;
 656                         ntuner++;
 657                         break;
 658                 case MEDIA_ENT_F_DTV_DEMOD:
 659                         demod = entity;
 660                         ndemod++;
 661                         break;
 662                 case MEDIA_ENT_F_TS_DEMUX:
 663                         demux = entity;
 664                         break;
 665                 case MEDIA_ENT_F_DTV_CA:
 666                         ca = entity;
 667                         break;
 668                 }
 669         }
 670
 671         /*
 672          * Prepare to signalize to media_create_pad_links() that multiple
 673          * entities of the same type exists and a 1:n or n:1 links need to be
 674          * created.
 675          * NOTE: if both tuner and demod have multiple instances, it is up
 676          * to the caller driver to create such links.
 677          */
 678         if (ntuner > 1)
 679                 tuner = NULL;
 680         if (ndemod > 1)
 681                 demod = NULL;
 682
 683         if (create_rf_connector) {
 684                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 685                 if (!conn)
 686                         return -ENOMEM;
 687                 adap->conn = conn;
 688
 689                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 690                 if (!adap->conn_pads)
 691                         return -ENOMEM;
 692
 693                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 694                 conn->function = MEDIA_ENT_F_CONN_RF;
 695                 conn->name = connector_name;
 696                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 697
 698                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 699                 if (ret)
 700                         return ret;
 701
 702                 ret = media_device_register_entity(mdev, conn);
 703                 if (ret)
 704                         return ret;
 705
 706                 if (!ntuner)
 707                         ret = media_create_pad_links(mdev,
 708                                                      MEDIA_ENT_F_CONN_RF,
 709                                                      conn, 0,
 710                                                      MEDIA_ENT_F_DTV_DEMOD,
 711                                                      demod, 0,
 712                                                      MEDIA_LNK_FL_ENABLED,
 713                                                      false);
 714                 else
 715                         ret = media_create_pad_links(mdev,
 716                                                      MEDIA_ENT_F_CONN_RF,
 717                                                      conn, 0,
 718                                                      MEDIA_ENT_F_TUNER,
 719                                                      tuner, TUNER_PAD_RF_INPUT,
 720                                                      MEDIA_LNK_FL_ENABLED,
 721                                                      false);
 722                 if (ret)
 723                         return ret;
 724         }
 725
 726         if (ntuner && ndemod) {
 727                 ret = media_create_pad_links(mdev,
 728                                              MEDIA_ENT_F_TUNER,
 729                                              tuner, TUNER_PAD_OUTPUT,
 730                                              MEDIA_ENT_F_DTV_DEMOD,
 731                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 732                                              false);
 733                 if (ret)
 734                         return ret;
 735         }
 736
 737         if (ndemod && demux) {
 738                 ret = media_create_pad_links(mdev,
 739                                              MEDIA_ENT_F_DTV_DEMOD,
 740                                              demod, 1,
 741                                              MEDIA_ENT_F_TS_DEMUX,
 742                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 743                                              false);
 744                 if (ret)
 745                         return ret;
 746         }
 747         if (demux && ca) {
 748                 ret = media_create_pad_link(demux, 1, ca,
 749                                             0, MEDIA_LNK_FL_ENABLED);
 750                 if (ret)
 751                         return ret;
 752         }
 753
 754         /* Create demux links for each ringbuffer/pad */
 755         if (demux) {
 756                 media_device_for_each_entity(entity, mdev) {
 757                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 758                                 if (!strncmp(entity->name, DVR_TSOUT,
 759                                     strlen(DVR_TSOUT))) {
 760                                         ret = media_create_pad_link(demux,
 761                                                                 ++dvr_pad,
 762                                                             entity, 0, 0);
 763                                         if (ret)
 764                                                 return ret;
 765                                 }
 766                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 767                                     strlen(DEMUX_TSOUT))) {
 768                                         ret = media_create_pad_link(demux,
 769                                                               ++demux_pad,
 770                                                             entity, 0, 0);
 771                                         if (ret)
 772                                                 return ret;
 773                                 }
 774                         }
 775                 }
 776         }
 777
 778         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 779         media_device_for_each_intf(intf, mdev) {
 780                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 781                         link = media_create_intf_link(ca, intf,
 782                                                       MEDIA_LNK_FL_ENABLED |
 783                                                       MEDIA_LNK_FL_IMMUTABLE);
 784                         if (!link)
 785                                 return -ENOMEM;
 786                 }
 787
 788                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 789                         link = media_create_intf_link(tuner, intf,
 790                                                       MEDIA_LNK_FL_ENABLED |
 791                                                       MEDIA_LNK_FL_IMMUTABLE);
 792                         if (!link)
 793                                 return -ENOMEM;
 794                 }
 795 #if 0
 796                 /*
 797                  * Indirect link - let's not create yet, as we don't know how
 798                  *                 to handle indirect links, nor if this will
 799                  *                 actually be needed.
 800                  */
 801                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 802                         link = media_create_intf_link(demux, intf,
 803                                                       MEDIA_LNK_FL_ENABLED |
 804                                                       MEDIA_LNK_FL_IMMUTABLE);
 805                         if (!link)
 806                                 return -ENOMEM;
 807                 }
 808 #endif
 809                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 810                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 811                         if (ret)
 812                                 return ret;
 813                 }
 814                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 815                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 816                         if (ret)
 817                                 return ret;
 818                 }
 819         }
 820         return 0;
 821 }
 822 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 823 #endif
 824
 825 static int dvbdev_check_free_adapter_num(int num)
 826 {
 827         struct list_head *entry;
 828         list_for_each(entry, &dvb_adapter_list) {
 829                 struct dvb_adapter *adap;
 830                 adap = list_entry(entry, struct dvb_adapter, list_head);
 831                 if (adap->num == num)
 832                         return 0;
 833         }
 834         return 1;
 835 }
 836
 837 static int dvbdev_get_free_adapter_num (void)
 838 {
 839         int num = 0;
 840
 841         while (num < DVB_MAX_ADAPTERS) {
 842                 if (dvbdev_check_free_adapter_num(num))
 843                         return num;
 844                 num++;
 845         }
 846
 847         return -ENFILE;
 848 }
 849
 850
 851 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 852                          struct module *module, struct device *device,
 853                          short *adapter_nums)
 854 {
 855         int i, num;
 856
 857         mutex_lock(&dvbdev_register_lock);
 858
 859         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 860                 num = adapter_nums[i];
 861                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 862                 /* use the one the driver asked for */
 863                         if (dvbdev_check_free_adapter_num(num))
 864                                 break;
 865                 } else {
 866                         num = dvbdev_get_free_adapter_num();
 867                         break;
 868                 }
 869                 num = -1;
 870         }
 871
 872         if (num < 0) {
 873                 mutex_unlock(&dvbdev_register_lock);
 874                 return -ENFILE;
 875         }
 876
 877         memset (adap, 0, sizeof(struct dvb_adapter));
 878         INIT_LIST_HEAD (&adap->device_list);
 879
 880         pr_info("DVB: registering new adapter (%s)\n", name);
 881
 882         adap->num = num;
 883         adap->name = name;
 884         adap->module = module;
 885         adap->device = device;
 886         adap->mfe_shared = 0;
 887         adap->mfe_dvbdev = NULL;
 888         mutex_init (&adap->mfe_lock);
 889
 890 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 891         mutex_init(&adap->mdev_lock);
 892 #endif
 893
 894         list_add_tail (&adap->list_head, &dvb_adapter_list);
 895
 896         mutex_unlock(&dvbdev_register_lock);
 897
 898         return num;
 899 }
 900 EXPORT_SYMBOL(dvb_register_adapter);
 901
 902
 903 int dvb_unregister_adapter(struct dvb_adapter *adap)
 904 {
 905         mutex_lock(&dvbdev_register_lock);
 906         list_del (&adap->list_head);
 907         mutex_unlock(&dvbdev_register_lock);
 908         return 0;
 909 }
 910 EXPORT_SYMBOL(dvb_unregister_adapter);
 911
 912 /* if the miracle happens and "generic_usercopy()" is included into
 913    the kernel, then this can vanish. please don't make the mistake and
 914    define this as video_usercopy(). this will introduce a dependecy
 915    to the v4l "videodev.o" module, which is unnecessary for some
 916    cards (ie. the budget dvb-cards don't need the v4l module...) */
 917 int dvb_usercopy(struct file *file,
 918                      unsigned int cmd, unsigned long arg,
 919                      int (*func)(struct file *file,
 920                      unsigned int cmd, void *arg))
 921 {
 922         char    sbuf[128];
 923         void    *mbuf = NULL;
 924         void    *parg = NULL;
 925         int     err  = -EINVAL;
 926
 927         /*  Copy arguments into temp kernel buffer  */
 928         switch (_IOC_DIR(cmd)) {
 929         case _IOC_NONE:
 930                 /*
 931                  * For this command, the pointer is actually an integer
 932                  * argument.
 933                  */
 934                 parg = (void *) arg;
 935                 break;
 936         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 937         case _IOC_WRITE:
 938         case (_IOC_WRITE | _IOC_READ):
 939                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 940                         parg = sbuf;
 941                 } else {
 942                         /* too big to allocate from stack */
 943                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 944                         if (NULL == mbuf)
 945                                 return -ENOMEM;
 946                         parg = mbuf;
 947                 }
 948
 949                 err = -EFAULT;
 950                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 951                         goto out;
 952                 break;
 953         }
 954
 955         /* call driver */
 956         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 957                 err = -ENOTTY;
 958
 959         if (err < 0)
 960                 goto out;
 961
 962         /*  Copy results into user buffer  */
 963         switch (_IOC_DIR(cmd))
 964         {
 965         case _IOC_READ:
 966         case (_IOC_WRITE | _IOC_READ):
 967                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 968                         err = -EFAULT;
 969                 break;
 970         }
 971
 972 out:
 973         kfree(mbuf);
 974         return err;
 975 }
 976
 977 #if IS_ENABLED(CONFIG_I2C)
 978 struct i2c_client *dvb_module_probe(const char *module_name,
 979                                     const char *name,
 980                                     struct i2c_adapter *adap,
 981                                     unsigned char addr,
 982                                     void *platform_data)
 983 {
 984         struct i2c_client *client;
 985         struct i2c_board_info *board_info;
 986
 987         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 988         if (!board_info)
 989                 return NULL;
 990
 991         if (name)
 992                 strlcpy(board_info->type, name, I2C_NAME_SIZE);
 993         else
 994                 strlcpy(board_info->type, module_name, I2C_NAME_SIZE);
 995
 996         board_info->addr = addr;
 997         board_info->platform_data = platform_data;
 998         request_module(module_name);
 999         client = i2c_new_device(adap, board_info);
1000         if (client == NULL || client->dev.driver == NULL) {
1001                 kfree(board_info);
1002                 return NULL;
1003         }
1004
1005         if (!try_module_get(client->dev.driver->owner)) {
1006                 i2c_unregister_device(client);
1007                 client = NULL;
1008         }
1009
1010         kfree(board_info);
1011         return client;
1012 }
1013 EXPORT_SYMBOL_GPL(dvb_module_probe);
1014
1015 void dvb_module_release(struct i2c_client *client)
1016 {
1017         if (!client)
1018                 return;
1019
1020         module_put(client->dev.driver->owner);
1021         i2c_unregister_device(client);
1022 }
1023 EXPORT_SYMBOL_GPL(dvb_module_release);
1024 #endif
1025
1026 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1027 {
1028         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1029
1030         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1031         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1032         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1033         return 0;
1034 }
1035
1036 static char *dvb_devnode(struct device *dev, umode_t *mode)
1037 {
1038         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1039
1040         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1041                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1042 }
1043
1044
1045 static int __init init_dvbdev(void)
1046 {
1047         int retval;
1048         dev_t dev = MKDEV(DVB_MAJOR, 0);
1049
1050         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1051                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1052                 return retval;
1053         }
1054
1055         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1056         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1057                 pr_err("dvb-core: unable register character device\n");
1058                 goto error;
1059         }
1060
1061         dvb_class = class_create(THIS_MODULE, "dvb");
1062         if (IS_ERR(dvb_class)) {
1063                 retval = PTR_ERR(dvb_class);
1064                 goto error;
1065         }
1066         dvb_class->dev_uevent = dvb_uevent;
1067         dvb_class->devnode = dvb_devnode;
1068         return 0;
1069
1070 error:
1071         cdev_del(&dvb_device_cdev);
1072         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1073         return retval;
1074 }
1075
1076
1077 static void __exit exit_dvbdev(void)
1078 {
1079         class_destroy(dvb_class);
1080         cdev_del(&dvb_device_cdev);
1081         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1082 }
1083
1084 subsys_initcall(init_dvbdev);
1085 module_exit(exit_dvbdev);
1086
1087 MODULE_DESCRIPTION("DVB Core Driver");
1088 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1089 MODULE_LICENSE("GPL");