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