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  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  */
  23
  24 #include <linux/types.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/device.h>
  32 #include <linux/fs.h>
  33 #include <linux/cdev.h>
  34 #include <linux/mutex.h>
  35 #include "dvbdev.h"
  36
  37 static DEFINE_MUTEX(dvbdev_mutex);
  38 static int dvbdev_debug;
  39
  40 module_param(dvbdev_debug, int, 0644);
  41 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  42
  43 #define dprintk if (dvbdev_debug) printk
  44
  45 static LIST_HEAD(dvb_adapter_list);
  46 static DEFINE_MUTEX(dvbdev_register_lock);
  47
  48 static const char * const dnames[] = {
  49         "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
  50         "net", "osd"
  51 };
  52
  53 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  54 #define MAX_DVB_MINORS          256
  55 #define DVB_MAX_IDS             MAX_DVB_MINORS
  56 #else
  57 #define DVB_MAX_IDS             4
  58 #define nums2minor(num,type,id) ((num << 6) | (id << 4) | type)
  59 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  60 #endif
  61
  62 static struct class *dvb_class;
  63
  64 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  65 static DECLARE_RWSEM(minor_rwsem);
  66
  67 static int dvb_device_open(struct inode *inode, struct file *file)
  68 {
  69         struct dvb_device *dvbdev;
  70
  71         mutex_lock(&dvbdev_mutex);
  72         down_read(&minor_rwsem);
  73         dvbdev = dvb_minors[iminor(inode)];
  74
  75         if (dvbdev && dvbdev->fops) {
  76                 int err = 0;
  77                 const struct file_operations *new_fops;
  78
  79                 new_fops = fops_get(dvbdev->fops);
  80                 if (!new_fops)
  81                         goto fail;
  82                 file->private_data = dvbdev;
  83                 replace_fops(file, new_fops);
  84                 if (file->f_op->open)
  85                         err = file->f_op->open(inode,file);
  86                 up_read(&minor_rwsem);
  87                 mutex_unlock(&dvbdev_mutex);
  88                 return err;
  89         }
  90 fail:
  91         up_read(&minor_rwsem);
  92         mutex_unlock(&dvbdev_mutex);
  93         return -ENODEV;
  94 }
  95
  96
  97 static const struct file_operations dvb_device_fops =
  98 {
  99         .owner =        THIS_MODULE,
 100         .open =         dvb_device_open,
 101         .llseek =       noop_llseek,
 102 };
 103
 104 static struct cdev dvb_device_cdev;
 105
 106 int dvb_generic_open(struct inode *inode, struct file *file)
 107 {
 108         struct dvb_device *dvbdev = file->private_data;
 109
 110         if (!dvbdev)
 111                 return -ENODEV;
 112
 113         if (!dvbdev->users)
 114                 return -EBUSY;
 115
 116         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 117                 if (!dvbdev->readers)
 118                         return -EBUSY;
 119                 dvbdev->readers--;
 120         } else {
 121                 if (!dvbdev->writers)
 122                         return -EBUSY;
 123                 dvbdev->writers--;
 124         }
 125
 126         dvbdev->users--;
 127         return 0;
 128 }
 129 EXPORT_SYMBOL(dvb_generic_open);
 130
 131
 132 int dvb_generic_release(struct inode *inode, struct file *file)
 133 {
 134         struct dvb_device *dvbdev = file->private_data;
 135
 136         if (!dvbdev)
 137                 return -ENODEV;
 138
 139         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 140                 dvbdev->readers++;
 141         } else {
 142                 dvbdev->writers++;
 143         }
 144
 145         dvbdev->users++;
 146         return 0;
 147 }
 148 EXPORT_SYMBOL(dvb_generic_release);
 149
 150
 151 long dvb_generic_ioctl(struct file *file,
 152                        unsigned int cmd, unsigned long arg)
 153 {
 154         struct dvb_device *dvbdev = file->private_data;
 155
 156         if (!dvbdev)
 157                 return -ENODEV;
 158
 159         if (!dvbdev->kernel_ioctl)
 160                 return -EINVAL;
 161
 162         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 163 }
 164 EXPORT_SYMBOL(dvb_generic_ioctl);
 165
 166
 167 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 168 {
 169         u32 id = 0;
 170
 171         while (id < DVB_MAX_IDS) {
 172                 struct dvb_device *dev;
 173                 list_for_each_entry(dev, &adap->device_list, list_head)
 174                         if (dev->type == type && dev->id == id)
 175                                 goto skip;
 176                 return id;
 177 skip:
 178                 id++;
 179         }
 180         return -ENFILE;
 181 }
 182
 183 static void dvb_register_media_device(struct dvb_device *dvbdev,
 184                                       int type, int minor)
 185 {
 186 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 187         int ret = 0, npads;
 188
 189         if (!dvbdev->adapter->mdev)
 190                 return;
 191
 192         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 193         if (!dvbdev->entity)
 194                 return;
 195
 196         dvbdev->entity->info.dev.major = DVB_MAJOR;
 197         dvbdev->entity->info.dev.minor = minor;
 198         dvbdev->entity->name = dvbdev->name;
 199
 200         switch (type) {
 201         case DVB_DEVICE_CA:
 202         case DVB_DEVICE_DEMUX:
 203         case DVB_DEVICE_FRONTEND:
 204                 npads = 2;
 205                 break;
 206         case DVB_DEVICE_NET:
 207                 npads = 0;
 208                 break;
 209         default:
 210                 npads = 1;
 211         }
 212
 213         if (npads) {
 214                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 215                                        GFP_KERNEL);
 216                 if (!dvbdev->pads) {
 217                         kfree(dvbdev->entity);
 218                         return;
 219                 }
 220         }
 221
 222         switch (type) {
 223         case DVB_DEVICE_FRONTEND:
 224                 dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
 225                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 226                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 227                 break;
 228         case DVB_DEVICE_DEMUX:
 229                 dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
 230                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 231                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 232                 break;
 233         case DVB_DEVICE_DVR:
 234                 dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DVR;
 235                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 236                 break;
 237         case DVB_DEVICE_CA:
 238                 dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
 239                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 240                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 241                 break;
 242         case DVB_DEVICE_NET:
 243                 dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_NET;
 244                 break;
 245         default:
 246                 kfree(dvbdev->entity);
 247                 dvbdev->entity = NULL;
 248                 return;
 249         }
 250
 251         if (npads)
 252                 ret = media_entity_init(dvbdev->entity, npads, dvbdev->pads, 0);
 253         if (!ret)
 254                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 255                                                    dvbdev->entity);
 256         if (ret < 0) {
 257                 printk(KERN_ERR
 258                         "%s: media_device_register_entity failed for %s\n",
 259                         __func__, dvbdev->entity->name);
 260                 kfree(dvbdev->pads);
 261                 kfree(dvbdev->entity);
 262                 dvbdev->entity = NULL;
 263                 return;
 264         }
 265
 266         printk(KERN_DEBUG "%s: media device '%s' registered.\n",
 267                 __func__, dvbdev->entity->name);
 268 #endif
 269 }
 270
 271 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 272                         const struct dvb_device *template, void *priv, int type)
 273 {
 274         struct dvb_device *dvbdev;
 275         struct file_operations *dvbdevfops;
 276         struct device *clsdev;
 277         int minor;
 278         int id;
 279
 280         mutex_lock(&dvbdev_register_lock);
 281
 282         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 283                 mutex_unlock(&dvbdev_register_lock);
 284                 *pdvbdev = NULL;
 285                 printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
 286                 return -ENFILE;
 287         }
 288
 289         *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
 290
 291         if (!dvbdev){
 292                 mutex_unlock(&dvbdev_register_lock);
 293                 return -ENOMEM;
 294         }
 295
 296         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 297
 298         if (!dvbdevfops){
 299                 kfree (dvbdev);
 300                 mutex_unlock(&dvbdev_register_lock);
 301                 return -ENOMEM;
 302         }
 303
 304         memcpy(dvbdev, template, sizeof(struct dvb_device));
 305         dvbdev->type = type;
 306         dvbdev->id = id;
 307         dvbdev->adapter = adap;
 308         dvbdev->priv = priv;
 309         dvbdev->fops = dvbdevfops;
 310         init_waitqueue_head (&dvbdev->wait_queue);
 311
 312         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 313         dvbdevfops->owner = adap->module;
 314
 315         list_add_tail (&dvbdev->list_head, &adap->device_list);
 316
 317         down_write(&minor_rwsem);
 318 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 319         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 320                 if (dvb_minors[minor] == NULL)
 321                         break;
 322
 323         if (minor == MAX_DVB_MINORS) {
 324                 kfree(dvbdevfops);
 325                 kfree(dvbdev);
 326                 up_write(&minor_rwsem);
 327                 mutex_unlock(&dvbdev_register_lock);
 328                 return -EINVAL;
 329         }
 330 #else
 331         minor = nums2minor(adap->num, type, id);
 332 #endif
 333
 334         dvbdev->minor = minor;
 335         dvb_minors[minor] = dvbdev;
 336         up_write(&minor_rwsem);
 337
 338         mutex_unlock(&dvbdev_register_lock);
 339
 340         clsdev = device_create(dvb_class, adap->device,
 341                                MKDEV(DVB_MAJOR, minor),
 342                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 343         if (IS_ERR(clsdev)) {
 344                 printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
 345                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 346                 return PTR_ERR(clsdev);
 347         }
 348         dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 349                 adap->num, dnames[type], id, minor, minor);
 350
 351         dvb_register_media_device(dvbdev, type, minor);
 352
 353         return 0;
 354 }
 355 EXPORT_SYMBOL(dvb_register_device);
 356
 357
 358 void dvb_unregister_device(struct dvb_device *dvbdev)
 359 {
 360         if (!dvbdev)
 361                 return;
 362
 363         down_write(&minor_rwsem);
 364         dvb_minors[dvbdev->minor] = NULL;
 365         up_write(&minor_rwsem);
 366
 367         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 368
 369 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 370         if (dvbdev->entity) {
 371                 media_device_unregister_entity(dvbdev->entity);
 372                 kfree(dvbdev->entity);
 373                 kfree(dvbdev->pads);
 374         }
 375 #endif
 376
 377         list_del (&dvbdev->list_head);
 378         kfree (dvbdev->fops);
 379         kfree (dvbdev);
 380 }
 381 EXPORT_SYMBOL(dvb_unregister_device);
 382
 383
 384 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 385 void dvb_create_media_graph(struct dvb_adapter *adap)
 386 {
 387         struct media_device *mdev = adap->mdev;
 388         struct media_entity *entity, *tuner = NULL, *fe = NULL;
 389         struct media_entity *demux = NULL, *dvr = NULL, *ca = NULL;
 390
 391         if (!mdev)
 392                 return;
 393
 394         media_device_for_each_entity(entity, mdev) {
 395                 switch (entity->type) {
 396                 case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
 397                         tuner = entity;
 398                         break;
 399                 case MEDIA_ENT_T_DEVNODE_DVB_FE:
 400                         fe = entity;
 401                         break;
 402                 case MEDIA_ENT_T_DEVNODE_DVB_DEMUX:
 403                         demux = entity;
 404                         break;
 405                 case MEDIA_ENT_T_DEVNODE_DVB_DVR:
 406                         dvr = entity;
 407                         break;
 408                 case MEDIA_ENT_T_DEVNODE_DVB_CA:
 409                         ca = entity;
 410                         break;
 411                 }
 412         }
 413
 414         if (tuner && fe)
 415                 media_entity_create_link(tuner, 0, fe, 0, 0);
 416
 417         if (fe && demux)
 418                 media_entity_create_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
 419
 420         if (demux && dvr)
 421                 media_entity_create_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);
 422
 423         if (demux && ca)
 424                 media_entity_create_link(demux, 1, ca, 0, MEDIA_LNK_FL_ENABLED);
 425 }
 426 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 427 #endif
 428
 429 static int dvbdev_check_free_adapter_num(int num)
 430 {
 431         struct list_head *entry;
 432         list_for_each(entry, &dvb_adapter_list) {
 433                 struct dvb_adapter *adap;
 434                 adap = list_entry(entry, struct dvb_adapter, list_head);
 435                 if (adap->num == num)
 436                         return 0;
 437         }
 438         return 1;
 439 }
 440
 441 static int dvbdev_get_free_adapter_num (void)
 442 {
 443         int num = 0;
 444
 445         while (num < DVB_MAX_ADAPTERS) {
 446                 if (dvbdev_check_free_adapter_num(num))
 447                         return num;
 448                 num++;
 449         }
 450
 451         return -ENFILE;
 452 }
 453
 454
 455 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 456                          struct module *module, struct device *device,
 457                          short *adapter_nums)
 458 {
 459         int i, num;
 460
 461         mutex_lock(&dvbdev_register_lock);
 462
 463         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 464                 num = adapter_nums[i];
 465                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 466                 /* use the one the driver asked for */
 467                         if (dvbdev_check_free_adapter_num(num))
 468                                 break;
 469                 } else {
 470                         num = dvbdev_get_free_adapter_num();
 471                         break;
 472                 }
 473                 num = -1;
 474         }
 475
 476         if (num < 0) {
 477                 mutex_unlock(&dvbdev_register_lock);
 478                 return -ENFILE;
 479         }
 480
 481         memset (adap, 0, sizeof(struct dvb_adapter));
 482         INIT_LIST_HEAD (&adap->device_list);
 483
 484         printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
 485
 486         adap->num = num;
 487         adap->name = name;
 488         adap->module = module;
 489         adap->device = device;
 490         adap->mfe_shared = 0;
 491         adap->mfe_dvbdev = NULL;
 492         mutex_init (&adap->mfe_lock);
 493
 494         list_add_tail (&adap->list_head, &dvb_adapter_list);
 495
 496         mutex_unlock(&dvbdev_register_lock);
 497
 498         return num;
 499 }
 500 EXPORT_SYMBOL(dvb_register_adapter);
 501
 502
 503 int dvb_unregister_adapter(struct dvb_adapter *adap)
 504 {
 505         mutex_lock(&dvbdev_register_lock);
 506         list_del (&adap->list_head);
 507         mutex_unlock(&dvbdev_register_lock);
 508         return 0;
 509 }
 510 EXPORT_SYMBOL(dvb_unregister_adapter);
 511
 512 /* if the miracle happens and "generic_usercopy()" is included into
 513    the kernel, then this can vanish. please don't make the mistake and
 514    define this as video_usercopy(). this will introduce a dependecy
 515    to the v4l "videodev.o" module, which is unnecessary for some
 516    cards (ie. the budget dvb-cards don't need the v4l module...) */
 517 int dvb_usercopy(struct file *file,
 518                      unsigned int cmd, unsigned long arg,
 519                      int (*func)(struct file *file,
 520                      unsigned int cmd, void *arg))
 521 {
 522         char    sbuf[128];
 523         void    *mbuf = NULL;
 524         void    *parg = NULL;
 525         int     err  = -EINVAL;
 526
 527         /*  Copy arguments into temp kernel buffer  */
 528         switch (_IOC_DIR(cmd)) {
 529         case _IOC_NONE:
 530                 /*
 531                  * For this command, the pointer is actually an integer
 532                  * argument.
 533                  */
 534                 parg = (void *) arg;
 535                 break;
 536         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 537         case _IOC_WRITE:
 538         case (_IOC_WRITE | _IOC_READ):
 539                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 540                         parg = sbuf;
 541                 } else {
 542                         /* too big to allocate from stack */
 543                         mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
 544                         if (NULL == mbuf)
 545                                 return -ENOMEM;
 546                         parg = mbuf;
 547                 }
 548
 549                 err = -EFAULT;
 550                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 551                         goto out;
 552                 break;
 553         }
 554
 555         /* call driver */
 556         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 557                 err = -ENOTTY;
 558
 559         if (err < 0)
 560                 goto out;
 561
 562         /*  Copy results into user buffer  */
 563         switch (_IOC_DIR(cmd))
 564         {
 565         case _IOC_READ:
 566         case (_IOC_WRITE | _IOC_READ):
 567                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 568                         err = -EFAULT;
 569                 break;
 570         }
 571
 572 out:
 573         kfree(mbuf);
 574         return err;
 575 }
 576
 577 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 578 {
 579         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 580
 581         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 582         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 583         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 584         return 0;
 585 }
 586
 587 static char *dvb_devnode(struct device *dev, umode_t *mode)
 588 {
 589         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 590
 591         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 592                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 593 }
 594
 595
 596 static int __init init_dvbdev(void)
 597 {
 598         int retval;
 599         dev_t dev = MKDEV(DVB_MAJOR, 0);
 600
 601         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 602                 printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
 603                 return retval;
 604         }
 605
 606         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 607         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 608                 printk(KERN_ERR "dvb-core: unable register character device\n");
 609                 goto error;
 610         }
 611
 612         dvb_class = class_create(THIS_MODULE, "dvb");
 613         if (IS_ERR(dvb_class)) {
 614                 retval = PTR_ERR(dvb_class);
 615                 goto error;
 616         }
 617         dvb_class->dev_uevent = dvb_uevent;
 618         dvb_class->devnode = dvb_devnode;
 619         return 0;
 620
 621 error:
 622         cdev_del(&dvb_device_cdev);
 623         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 624         return retval;
 625 }
 626
 627
 628 static void __exit exit_dvbdev(void)
 629 {
 630         class_destroy(dvb_class);
 631         cdev_del(&dvb_device_cdev);
 632         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 633 }
 634
 635 subsys_initcall(init_dvbdev);
 636 module_exit(exit_dvbdev);
 637
 638 MODULE_DESCRIPTION("DVB Core Driver");
 639 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 640 MODULE_LICENSE("GPL");