drivers/media/dvb/dvb-core/dvb_frontend.c

   1 /*
   2  * dvb-core.c: DVB core driver
   3  *
   4  * Copyright (C) 1999-2001 Ralph  Metzler
   5  *                         Marcus Metzler
   6  *                         Holger Waechtler
   7  *                                    for convergence integrated media GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  23  */
  24
  25 #include <linux/string.h>
  26 #include <linux/kernel.h>
  27 #include <linux/sched.h>
  28 #include <linux/wait.h>
  29 #include <linux/slab.h>
  30 #include <linux/poll.h>
  31 #include <linux/module.h>
  32 #include <linux/list.h>
  33 #include <asm/processor.h>
  34 #include <asm/semaphore.h>
  35
  36 #include "dvb_frontend.h"
  37 #include "dvbdev.h"
  38 #include "dvb_functions.h"
  39
  40
  41 static int dvb_frontend_debug = 0;
  42 static int dvb_shutdown_timeout = 5;
  43
  44 #define dprintk if (dvb_frontend_debug) printk
  45
  46 #define MAX_EVENT 8
  47
  48 struct dvb_fe_events {
  49         struct dvb_frontend_event events[MAX_EVENT];
  50         int                       eventw;
  51         int                       eventr;
  52         int                       overflow;
  53         wait_queue_head_t         wait_queue;
  54         struct semaphore          sem;
  55 };
  56
  57
  58 struct dvb_frontend_data {
  59         struct dvb_frontend_info *info;
  60         struct dvb_frontend frontend;
  61         struct dvb_device *dvbdev;
  62         struct dvb_frontend_parameters parameters;
  63         struct dvb_fe_events events;
  64         struct semaphore sem;
  65         struct list_head list_head;
  66         wait_queue_head_t wait_queue;
  67         pid_t thread_pid;
  68         unsigned long release_jiffies;
  69         unsigned long lost_sync_jiffies;
  70         int bending;
  71         int lnb_drift;
  72         int timeout_count;
  73         int lost_sync_count;
  74         int exit;
  75         fe_status_t status;
  76 };
  77
  78
  79 struct dvb_frontend_ioctl_data {
  80         struct list_head list_head;
  81         struct dvb_adapter *adapter;
  82         int (*before_ioctl) (struct dvb_frontend *frontend,
  83                              unsigned int cmd, void *arg);
  84         int (*after_ioctl)  (struct dvb_frontend *frontend,
  85                              unsigned int cmd, void *arg);
  86         void *before_after_data;
  87 };
  88
  89
  90 struct dvb_frontend_notifier_data {
  91         struct list_head list_head;
  92         struct dvb_adapter *adapter;
  93         void (*callback) (fe_status_t s, void *data);
  94         void *data;
  95 };
  96
  97
  98 static LIST_HEAD(frontend_list);
  99 static LIST_HEAD(frontend_ioctl_list);
 100 static LIST_HEAD(frontend_notifier_list);
 101
 102 static DECLARE_MUTEX(frontend_mutex);
 103
 104
 105 static int dvb_frontend_internal_ioctl (struct dvb_frontend *frontend,
 106                                  unsigned int cmd, void *arg)
 107 {
 108         int err = -EOPNOTSUPP;
 109
 110         dprintk ("%s\n", __FUNCTION__);
 111
 112         if (frontend->before_ioctl)
 113                 err = frontend->before_ioctl (frontend, cmd, arg);
 114
 115         if (err == -EOPNOTSUPP) {
 116                 err = frontend->ioctl (frontend, cmd, arg);
 117
 118                 if ((err == -EOPNOTSUPP) && frontend->after_ioctl)
 119                         err = frontend->after_ioctl (frontend, cmd, arg);
 120         }
 121
 122         return err;
 123 }
 124
 125
 126 /**
 127  *  if 2 tuners are located side by side you can get interferences when
 128  *  they try to tune to the same frequency, so both lose sync.
 129  *  We will slightly mistune in this case. The AFC of the demodulator
 130  *  should make it still possible to receive the requested transponder
 131  *  on both tuners...
 132  */
 133 static void dvb_bend_frequency (struct dvb_frontend_data *this_fe, int recursive)
 134 {
 135         struct list_head *entry;
 136         int stepsize = this_fe->info->frequency_stepsize;
 137         int this_fe_adap_num = this_fe->frontend.i2c->adapter->num;
 138         int frequency;
 139
 140         if (!stepsize || recursive > 10) {
 141                 printk ("%s: too deep recursion, check frequency_stepsize "
 142                         "in your frontend code!\n", __FUNCTION__);
 143                 return;
 144         }
 145
 146         dprintk ("%s\n", __FUNCTION__);
 147
 148         if (!recursive) {
 149                 if (down_interruptible (&frontend_mutex))
 150                         return;
 151
 152                 this_fe->bending = 0;
 153         }
 154
 155         list_for_each (entry, &frontend_list) {
 156                 struct dvb_frontend_data *fe;
 157                 int f;
 158
 159                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 160
 161                 if (fe->frontend.i2c->adapter->num != this_fe_adap_num)
 162                         continue;
 163
 164                 f = fe->parameters.frequency;
 165                 f += fe->lnb_drift;
 166                 f += fe->bending;
 167
 168                 frequency = this_fe->parameters.frequency;
 169                 frequency += this_fe->lnb_drift;
 170                 frequency += this_fe->bending;
 171
 172                 if (this_fe != fe && fe->lost_sync_count != -1 &&
 173                     frequency > f - stepsize && frequency < f + stepsize)
 174                 {
 175                         if (recursive % 2)
 176                                 this_fe->bending += stepsize;
 177                         else
 178                                 this_fe->bending = -this_fe->bending;
 179
 180                         dvb_bend_frequency (this_fe, recursive + 1);
 181                         goto done;
 182                 }
 183         }
 184 done:
 185         if (!recursive)
 186                 up (&frontend_mutex);
 187 }
 188
 189
 190 static void dvb_call_frontend_notifiers (struct dvb_frontend_data *fe,
 191                                   fe_status_t s)
 192 {
 193         dprintk ("%s\n", __FUNCTION__);
 194
 195         if ((fe->status & FE_HAS_LOCK) && !(s & FE_HAS_LOCK))
 196                 fe->lost_sync_jiffies = jiffies;
 197
 198         if (((s ^ fe->status) & FE_HAS_LOCK) && (s & FE_HAS_LOCK))
 199                 dvb_delay (fe->info->notifier_delay);
 200
 201         fe->status = s;
 202
 203         if (!(s & FE_HAS_LOCK) && (fe->info->caps & FE_CAN_MUTE_TS))
 204                 return;
 205
 206         /**
 207          *   now tell the Demux about the TS status changes...
 208          */
 209         if (fe->frontend.notifier_callback)
 210                 fe->frontend.notifier_callback(fe->status, fe->frontend.notifier_data);
 211 }
 212
 213
 214 static void dvb_frontend_add_event (struct dvb_frontend_data *fe, fe_status_t status)
 215 {
 216         struct dvb_fe_events *events = &fe->events;
 217         struct dvb_frontend_event *e;
 218         int wp;
 219
 220         dprintk ("%s\n", __FUNCTION__);
 221
 222         if (down_interruptible (&events->sem))
 223                 return;
 224
 225         wp = (events->eventw + 1) % MAX_EVENT;
 226
 227         if (wp == events->eventr) {
 228                 events->overflow = 1;
 229                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 230         }
 231
 232         e = &events->events[events->eventw];
 233
 234         memcpy (&e->parameters, &fe->parameters,
 235                 sizeof (struct dvb_frontend_parameters));
 236
 237         if (status & FE_HAS_LOCK)
 238                 dvb_frontend_internal_ioctl (&fe->frontend,
 239                                              FE_GET_FRONTEND,
 240                                              &e->parameters);
 241         events->eventw = wp;
 242
 243         up (&events->sem);
 244
 245         e->status = status;
 246         dvb_call_frontend_notifiers (fe, status);
 247
 248         wake_up_interruptible (&events->wait_queue);
 249 }
 250
 251
 252 static int dvb_frontend_get_event (struct dvb_frontend_data *fe,
 253                             struct dvb_frontend_event *event, int flags)
 254 {
 255         struct dvb_fe_events *events = &fe->events;
 256
 257         dprintk ("%s\n", __FUNCTION__);
 258
 259         if (events->overflow) {
 260                 events->overflow = 0;
 261                 return -EOVERFLOW;
 262         }
 263
 264         if (events->eventw == events->eventr) {
 265                 int ret;
 266
 267                 if (flags & O_NONBLOCK)
 268                         return -EWOULDBLOCK;
 269
 270                 up(&fe->sem);
 271
 272                 ret = wait_event_interruptible (events->wait_queue,
 273                                                 events->eventw != events->eventr);
 274
 275                 if (down_interruptible (&fe->sem))
 276                         return -ERESTARTSYS;
 277
 278                 if (ret < 0)
 279                         return ret;
 280         }
 281
 282         if (down_interruptible (&events->sem))
 283                 return -ERESTARTSYS;
 284
 285         memcpy (event, &events->events[events->eventr],
 286                 sizeof(struct dvb_frontend_event));
 287
 288         events->eventr = (events->eventr + 1) % MAX_EVENT;
 289
 290         up (&events->sem);
 291
 292         return 0;
 293 }
 294
 295
 296 static int dvb_frontend_set_parameters (struct dvb_frontend_data *fe,
 297                                  struct dvb_frontend_parameters *param,
 298                                  int first_trial)
 299 {
 300         struct dvb_frontend *frontend = &fe->frontend;
 301         int err;
 302
 303         if (first_trial) {
 304                 fe->timeout_count = 0;
 305                 fe->lost_sync_count = 0;
 306                 fe->lost_sync_jiffies = jiffies;
 307                 fe->lnb_drift = 0;
 308                 if (fe->status & ~FE_TIMEDOUT)
 309                         dvb_frontend_add_event (fe, 0);
 310                 memcpy (&fe->parameters, param,
 311                         sizeof (struct dvb_frontend_parameters));
 312         }
 313
 314         dvb_bend_frequency (fe, 0);
 315
 316         dprintk ("%s: f == %i, drift == %i\n",
 317                  __FUNCTION__, (int) param->frequency, (int) fe->lnb_drift);
 318
 319         param->frequency += fe->lnb_drift + fe->bending;
 320         err = dvb_frontend_internal_ioctl (frontend, FE_SET_FRONTEND, param);
 321         param->frequency -= fe->lnb_drift + fe->bending;
 322
 323         wake_up_interruptible (&fe->wait_queue);
 324
 325         return err;
 326 }
 327
 328 static void dvb_frontend_init (struct dvb_frontend_data *fe)
 329 {
 330         struct dvb_frontend *frontend = &fe->frontend;
 331
 332         dprintk ("DVB: initialising frontend %i:%i (%s)...\n",
 333                  frontend->i2c->adapter->num, frontend->i2c->id,
 334                  fe->info->name);
 335
 336         dvb_frontend_internal_ioctl (frontend, FE_INIT, NULL);
 337 }
 338
 339
 340 static void update_delay (int *quality, int *delay, int locked)
 341 {
 342         int q2;
 343
 344         dprintk ("%s\n", __FUNCTION__);
 345
 346         if (locked)
 347                 (*quality) = (*quality * 220 + 36*256) / 256;
 348         else
 349                 (*quality) = (*quality * 220 + 0) / 256;
 350
 351         q2 = *quality - 128;
 352         q2 *= q2;
 353
 354         *delay = HZ/20 + q2 * HZ / (128*128);
 355 }
 356
 357
 358 #define LNB_DRIFT 1024  /*  max. tolerated LNB drift, XXX FIXME: adjust! */
 359 #define TIMEOUT 2*HZ
 360
 361 /**
 362  *  here we only come when we have lost the lock bit,
 363  *  let's try to do something useful...
 364  */
 365 static void dvb_frontend_recover (struct dvb_frontend_data *fe)
 366 {
 367         dprintk ("%s\n", __FUNCTION__);
 368
 369 #if 0
 370         if (fe->timeout_count > 3) {
 371                 printk ("%s: frontend seems dead, reinitializing...\n",
 372                         __FUNCTION__);
 373                 dvb_call_frontend_notifiers (fe, 0);
 374                 dvb_frontend_internal_ioctl (&fe->frontend, FE_INIT, NULL);
 375                 dvb_frontend_set_parameters (fe, &fe->parameters, 1);
 376                 dvb_frontend_add_event (fe, FE_REINIT);
 377                 fe->lost_sync_jiffies = jiffies;
 378                 fe->timeout_count = 0;
 379                 return;
 380         }
 381 #endif
 382
 383         /**
 384          *  let's start a zigzag scan to compensate LNB drift...
 385          */
 386         {
 387                 int j = fe->lost_sync_count;
 388                 int stepsize;
 389
 390                 if (fe->info->type == FE_QPSK)
 391                         stepsize = fe->parameters.u.qpsk.symbol_rate / 16000;
 392                 else if (fe->info->type == FE_QAM)
 393                         stepsize = 0;
 394                 else
 395                         stepsize = fe->info->frequency_stepsize * 2;
 396
 397                 if (j % 32 == 0) {
 398                         fe->lnb_drift = 0;
 399                 } else {
 400                         fe->lnb_drift = -fe->lnb_drift;
 401                         if (j % 2)
 402                                 fe->lnb_drift += stepsize;
 403                 }
 404
 405                 dvb_frontend_set_parameters (fe, &fe->parameters, 0);
 406         }
 407
 408         dvb_frontend_internal_ioctl (&fe->frontend, FE_RESET, NULL);
 409 }
 410
 411
 412
 413 static int dvb_frontend_is_exiting (struct dvb_frontend_data *fe)
 414 {
 415         if (fe->exit)
 416                 return 1;
 417
 418         if (fe->dvbdev->writers == 1)
 419                 if (jiffies - fe->release_jiffies > dvb_shutdown_timeout * HZ)
 420                         return 1;
 421
 422         return 0;
 423 }
 424
 425
 426 static int dvb_frontend_thread (void *data)
 427 {
 428         struct dvb_frontend_data *fe = (struct dvb_frontend_data *) data;
 429         char name [15];
 430         int quality = 0, delay = 3*HZ;
 431         fe_status_t s;
 432
 433         dprintk ("%s\n", __FUNCTION__);
 434
 435         snprintf (name, sizeof(name), "kdvb-fe-%i:%i",
 436                   fe->frontend.i2c->adapter->num, fe->frontend.i2c->id);
 437
 438         dvb_kernel_thread_setup (name);
 439
 440         fe->lost_sync_count = -1;
 441
 442         dvb_call_frontend_notifiers (fe, 0);
 443         dvb_frontend_init (fe);
 444
 445         while (!dvb_frontend_is_exiting (fe)) {
 446                 up (&fe->sem);      /* is locked when we enter the thread... */
 447
 448                 interruptible_sleep_on_timeout (&fe->wait_queue, delay);
 449                 if (signal_pending(current))
 450                         break;
 451
 452                 if (down_interruptible (&fe->sem))
 453                         break;
 454
 455                 if (fe->lost_sync_count == -1)
 456                         continue;
 457
 458                 if (dvb_frontend_is_exiting (fe))
 459                         break;
 460
 461                 dvb_frontend_internal_ioctl (&fe->frontend, FE_READ_STATUS, &s);
 462
 463                 update_delay (&quality, &delay, s & FE_HAS_LOCK);
 464
 465                 s &= ~FE_TIMEDOUT;
 466
 467                 if (s & FE_HAS_LOCK) {
 468                         fe->timeout_count = 0;
 469                         fe->lost_sync_count = 0;
 470                 } else {
 471                         fe->lost_sync_count++;
 472                         if (!(fe->info->caps & FE_CAN_RECOVER)) {
 473                                 if (!(fe->info->caps & FE_CAN_CLEAN_SETUP)) {
 474                                         if (fe->lost_sync_count < 10)
 475                                                 continue;
 476                                 }
 477                                 dvb_frontend_recover (fe);
 478                                 delay = HZ/5;
 479                         }
 480                         if (jiffies - fe->lost_sync_jiffies > TIMEOUT) {
 481                                 s |= FE_TIMEDOUT;
 482                                 if ((fe->status & FE_TIMEDOUT) == 0)
 483                                         fe->timeout_count++;
 484                         }
 485                 }
 486
 487                 if (s != fe->status)
 488                         dvb_frontend_add_event (fe, s);
 489         };
 490
 491         if (dvb_shutdown_timeout)
 492                 dvb_frontend_internal_ioctl (&fe->frontend, FE_SLEEP, NULL);
 493
 494         up (&fe->sem);
 495
 496         fe->thread_pid = 0;
 497         mb();
 498
 499         wake_up_interruptible (&fe->wait_queue);
 500         return 0;
 501 }
 502
 503
 504 static void dvb_frontend_stop (struct dvb_frontend_data *fe)
 505 {
 506         dprintk ("%s\n", __FUNCTION__);
 507
 508                 fe->exit = 1;
 509         mb();
 510
 511         if (!fe->thread_pid)
 512                 return;
 513
 514         /* check if the thread is really alive */
 515         if (kill_proc(fe->thread_pid, 0, 1) == -ESRCH) {
 516                 printk("dvb_frontend_stop: thread PID %d already died\n",
 517                                 fe->thread_pid);
 518                 /* make sure the mutex was not held by the thread */
 519                 init_MUTEX (&fe->sem);
 520                 return;
 521         }
 522
 523                 wake_up_interruptible (&fe->wait_queue);
 524         interruptible_sleep_on(&fe->wait_queue);
 525
 526         /* paranoia check */
 527         if (fe->thread_pid)
 528                 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
 529                                 fe->thread_pid);
 530 }
 531
 532
 533 static int dvb_frontend_start (struct dvb_frontend_data *fe)
 534 {
 535         int ret;
 536
 537         dprintk ("%s\n", __FUNCTION__);
 538
 539         if (fe->thread_pid) {
 540                 if (!fe->exit)
 541                         return 0;
 542                 else
 543                 dvb_frontend_stop (fe);
 544         }
 545
 546         if (signal_pending(current))
 547                 return -EINTR;
 548         if (down_interruptible (&fe->sem))
 549                 return -EINTR;
 550
 551         fe->exit = 0;
 552         fe->thread_pid = 0;
 553         mb();
 554
 555         ret = kernel_thread (dvb_frontend_thread, fe, 0);
 556         if (ret < 0) {
 557                 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
 558                 up(&fe->sem);
 559                 return ret;
 560         }
 561         fe->thread_pid = ret;
 562
 563         return 0;
 564 }
 565
 566
 567 static int dvb_frontend_ioctl (struct inode *inode, struct file *file,
 568                         unsigned int cmd, void *parg)
 569 {
 570         struct dvb_device *dvbdev = file->private_data;
 571         struct dvb_frontend_data *fe = dvbdev->priv;
 572         int err = 0;
 573
 574         dprintk ("%s\n", __FUNCTION__);
 575
 576         if (!fe || !fe->frontend.ioctl || fe->exit)
 577                 return -ENODEV;
 578
 579         if (down_interruptible (&fe->sem))
 580                 return -ERESTARTSYS;
 581
 582         switch (cmd) {
 583         case FE_DISEQC_SEND_MASTER_CMD:
 584         case FE_DISEQC_SEND_BURST:
 585         case FE_SET_TONE:
 586                 if (fe->status)
 587                         dvb_call_frontend_notifiers (fe, 0);
 588                 dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
 589                 break;
 590         case FE_SET_FRONTEND:
 591                 err = dvb_frontend_set_parameters (fe, parg, 1);
 592                 break;
 593         case FE_GET_EVENT:
 594                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
 595                 break;
 596         case FE_GET_FRONTEND:
 597                 memcpy (parg, &fe->parameters,
 598                         sizeof (struct dvb_frontend_parameters));
 599                 /*  fall-through... */
 600         default:
 601                 dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
 602         };
 603
 604         up (&fe->sem);
 605
 606         return err;
 607 }
 608
 609
 610 static unsigned int dvb_frontend_poll (struct file *file, struct poll_table_struct *wait)
 611 {
 612         struct dvb_device *dvbdev = file->private_data;
 613         struct dvb_frontend_data *fe = dvbdev->priv;
 614
 615         dprintk ("%s\n", __FUNCTION__);
 616
 617         poll_wait (file, &fe->events.wait_queue, wait);
 618
 619         if (fe->events.eventw != fe->events.eventr)
 620                 return (POLLIN | POLLRDNORM | POLLPRI);
 621
 622         return 0;
 623 }
 624
 625
 626 static int dvb_frontend_open (struct inode *inode, struct file *file)
 627 {
 628         struct dvb_device *dvbdev = file->private_data;
 629         struct dvb_frontend_data *fe = dvbdev->priv;
 630         int ret;
 631
 632         dprintk ("%s\n", __FUNCTION__);
 633
 634         if ((ret = dvb_generic_open (inode, file)) < 0)
 635                 return ret;
 636
 637         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 638                 ret = dvb_frontend_start (fe);
 639                 if (ret)
 640                         dvb_generic_release (inode, file);
 641
 642                 /*  empty event queue */
 643                 fe->events.eventr = fe->events.eventw = 0;
 644         }
 645
 646         return ret;
 647 }
 648
 649
 650 static int dvb_frontend_release (struct inode *inode, struct file *file)
 651 {
 652         struct dvb_device *dvbdev = file->private_data;
 653         struct dvb_frontend_data *fe = dvbdev->priv;
 654
 655         dprintk ("%s\n", __FUNCTION__);
 656
 657         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
 658                 fe->release_jiffies = jiffies;
 659
 660         return dvb_generic_release (inode, file);
 661 }
 662
 663
 664
 665 int
 666 dvb_add_frontend_ioctls (struct dvb_adapter *adapter,
 667                          int (*before_ioctl) (struct dvb_frontend *frontend,
 668                                               unsigned int cmd, void *arg),
 669                          int (*after_ioctl)  (struct dvb_frontend *frontend,
 670                                               unsigned int cmd, void *arg),
 671                          void *before_after_data)
 672 {
 673         struct dvb_frontend_ioctl_data *ioctl;
 674         struct list_head *entry;
 675
 676         dprintk ("%s\n", __FUNCTION__);
 677
 678         if (down_interruptible (&frontend_mutex))
 679                 return -ERESTARTSYS;
 680
 681         ioctl = kmalloc (sizeof(struct dvb_frontend_ioctl_data), GFP_KERNEL);
 682
 683         if (!ioctl) {
 684                 up (&frontend_mutex);
 685                 return -ENOMEM;
 686         }
 687
 688         ioctl->adapter = adapter;
 689         ioctl->before_ioctl = before_ioctl;
 690         ioctl->after_ioctl = after_ioctl;
 691         ioctl->before_after_data = before_after_data;
 692
 693         list_add_tail (&ioctl->list_head, &frontend_ioctl_list);
 694
 695         list_for_each (entry, &frontend_list) {
 696                 struct dvb_frontend_data *fe;
 697
 698                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 699
 700                 if (fe->frontend.i2c->adapter == adapter &&
 701                     fe->frontend.before_ioctl == NULL &&
 702                     fe->frontend.after_ioctl == NULL)
 703                 {
 704                         fe->frontend.before_ioctl = before_ioctl;
 705                         fe->frontend.after_ioctl = after_ioctl;
 706                         fe->frontend.before_after_data = before_after_data;
 707                 }
 708         }
 709
 710         up (&frontend_mutex);
 711
 712         return 0;
 713 }
 714
 715
 716 void
 717 dvb_remove_frontend_ioctls (struct dvb_adapter *adapter,
 718                             int (*before_ioctl) (struct dvb_frontend *frontend,
 719                                                  unsigned int cmd, void *arg),
 720                             int (*after_ioctl)  (struct dvb_frontend *frontend,
 721                                                  unsigned int cmd, void *arg))
 722 {
 723         struct list_head *entry, *n;
 724
 725         dprintk ("%s\n", __FUNCTION__);
 726
 727         down (&frontend_mutex);
 728
 729         list_for_each (entry, &frontend_list) {
 730                 struct dvb_frontend_data *fe;
 731
 732                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 733
 734                 if (fe->frontend.i2c->adapter == adapter &&
 735                     fe->frontend.before_ioctl == before_ioctl &&
 736                     fe->frontend.after_ioctl == after_ioctl)
 737                 {
 738                         fe->frontend.before_ioctl = NULL;
 739                         fe->frontend.after_ioctl = NULL;
 740
 741                 }
 742         }
 743
 744         list_for_each_safe (entry, n, &frontend_ioctl_list) {
 745                 struct dvb_frontend_ioctl_data *ioctl;
 746
 747                 ioctl = list_entry (entry, struct dvb_frontend_ioctl_data, list_head);
 748
 749                 if (ioctl->adapter == adapter &&
 750                     ioctl->before_ioctl == before_ioctl &&
 751                     ioctl->after_ioctl == after_ioctl)
 752                 {
 753                         list_del (&ioctl->list_head);
 754                         kfree (ioctl);
 755
 756                         break;
 757                 }
 758         }
 759
 760         up (&frontend_mutex);
 761 }
 762
 763
 764 int
 765 dvb_add_frontend_notifier (struct dvb_adapter *adapter,
 766                            void (*callback) (fe_status_t s, void *data),
 767                            void *data)
 768 {
 769         struct dvb_frontend_notifier_data *notifier;
 770         struct list_head *entry;
 771
 772         dprintk ("%s\n", __FUNCTION__);
 773
 774         if (down_interruptible (&frontend_mutex))
 775                 return -ERESTARTSYS;
 776
 777         notifier = kmalloc (sizeof(struct dvb_frontend_notifier_data), GFP_KERNEL);
 778
 779         if (!notifier) {
 780                 up (&frontend_mutex);
 781                 return -ENOMEM;
 782         }
 783
 784         notifier->adapter = adapter;
 785         notifier->callback = callback;
 786         notifier->data = data;
 787
 788         list_add_tail (&notifier->list_head, &frontend_notifier_list);
 789
 790         list_for_each (entry, &frontend_list) {
 791                 struct dvb_frontend_data *fe;
 792
 793                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 794
 795                 if (fe->frontend.i2c->adapter == adapter &&
 796                     fe->frontend.notifier_callback == NULL)
 797                 {
 798                         fe->frontend.notifier_callback = callback;
 799                         fe->frontend.notifier_data = data;
 800                 }
 801         }
 802
 803         up (&frontend_mutex);
 804
 805         return 0;
 806 }
 807
 808
 809 void
 810 dvb_remove_frontend_notifier (struct dvb_adapter *adapter,
 811                               void (*callback) (fe_status_t s, void *data))
 812 {
 813         struct list_head *entry, *n;
 814
 815         dprintk ("%s\n", __FUNCTION__);
 816
 817         down (&frontend_mutex);
 818
 819         list_for_each (entry, &frontend_list) {
 820                 struct dvb_frontend_data *fe;
 821
 822                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 823
 824                 if (fe->frontend.i2c->adapter == adapter &&
 825                     fe->frontend.notifier_callback == callback)
 826                 {
 827                         fe->frontend.notifier_callback = NULL;
 828
 829                 }
 830         }
 831
 832         list_for_each_safe (entry, n, &frontend_notifier_list) {
 833                 struct dvb_frontend_notifier_data *notifier;
 834
 835                 notifier = list_entry (entry, struct dvb_frontend_notifier_data, list_head);
 836
 837                 if (notifier->adapter == adapter &&
 838                     notifier->callback == callback)
 839                 {
 840                         list_del (&notifier->list_head);
 841                         kfree (notifier);
 842
 843                         break;
 844                 }
 845         }
 846
 847         up (&frontend_mutex);
 848 }
 849
 850
 851 static struct file_operations dvb_frontend_fops = {
 852         .owner          = THIS_MODULE,
 853         .ioctl          = dvb_generic_ioctl,
 854         .poll           = dvb_frontend_poll,
 855         .open           = dvb_frontend_open,
 856         .release        = dvb_frontend_release
 857 };
 858
 859
 860
 861 int
 862 dvb_register_frontend (int (*ioctl) (struct dvb_frontend *frontend,
 863                                      unsigned int cmd, void *arg),
 864                        struct dvb_i2c_bus *i2c,
 865                        void *data,
 866                        struct dvb_frontend_info *info)
 867 {
 868         struct list_head *entry;
 869         struct dvb_frontend_data *fe;
 870         static const struct dvb_device dvbdev_template = {
 871                 .users = ~0,
 872                 .writers = 1,
 873                 .fops = &dvb_frontend_fops,
 874                 .kernel_ioctl = dvb_frontend_ioctl
 875         };
 876
 877         dprintk ("%s\n", __FUNCTION__);
 878
 879         if (down_interruptible (&frontend_mutex))
 880                 return -ERESTARTSYS;
 881
 882         if (!(fe = kmalloc (sizeof (struct dvb_frontend_data), GFP_KERNEL))) {
 883                 up (&frontend_mutex);
 884                 return -ENOMEM;
 885         }
 886
 887         memset (fe, 0, sizeof (struct dvb_frontend_data));
 888
 889         init_MUTEX (&fe->sem);
 890         init_waitqueue_head (&fe->wait_queue);
 891         init_waitqueue_head (&fe->events.wait_queue);
 892         init_MUTEX (&fe->events.sem);
 893         fe->events.eventw = fe->events.eventr = 0;
 894         fe->events.overflow = 0;
 895
 896         fe->frontend.ioctl = ioctl;
 897         fe->frontend.i2c = i2c;
 898         fe->frontend.data = data;
 899         fe->info = info;
 900
 901         list_for_each (entry, &frontend_ioctl_list) {
 902                 struct dvb_frontend_ioctl_data *ioctl;
 903
 904                 ioctl = list_entry (entry,
 905                                     struct dvb_frontend_ioctl_data,
 906                                     list_head);
 907
 908                 if (ioctl->adapter == i2c->adapter) {
 909                         fe->frontend.before_ioctl = ioctl->before_ioctl;
 910                         fe->frontend.after_ioctl = ioctl->after_ioctl;
 911                         fe->frontend.before_after_data = ioctl->before_after_data;
 912                         break;
 913                 }
 914         }
 915
 916         list_for_each (entry, &frontend_notifier_list) {
 917                 struct dvb_frontend_notifier_data *notifier;
 918
 919                 notifier = list_entry (entry,
 920                                        struct dvb_frontend_notifier_data,
 921                                        list_head);
 922
 923                 if (notifier->adapter == i2c->adapter) {
 924                         fe->frontend.notifier_callback = notifier->callback;
 925                         fe->frontend.notifier_data = notifier->data;
 926                         break;
 927                 }
 928         }
 929
 930         list_add_tail (&fe->list_head, &frontend_list);
 931
 932         printk ("DVB: registering frontend %i:%i (%s)...\n",
 933                 fe->frontend.i2c->adapter->num, fe->frontend.i2c->id,
 934                 fe->info->name);
 935
 936         dvb_register_device (i2c->adapter, &fe->dvbdev, &dvbdev_template,
 937                              fe, DVB_DEVICE_FRONTEND);
 938
 939         up (&frontend_mutex);
 940
 941         return 0;
 942 }
 943
 944
 945 int dvb_unregister_frontend (int (*ioctl) (struct dvb_frontend *frontend,
 946                                            unsigned int cmd, void *arg),
 947                              struct dvb_i2c_bus *i2c)
 948 {
 949         struct list_head *entry, *n;
 950
 951         dprintk ("%s\n", __FUNCTION__);
 952
 953         down (&frontend_mutex);
 954
 955         list_for_each_safe (entry, n, &frontend_list) {
 956                 struct dvb_frontend_data *fe;
 957
 958                 fe = list_entry (entry, struct dvb_frontend_data, list_head);
 959
 960                 if (fe->frontend.ioctl == ioctl && fe->frontend.i2c == i2c) {
 961                         dvb_unregister_device (fe->dvbdev);
 962                         list_del (entry);
 963                         up (&frontend_mutex);
 964                         dvb_frontend_stop (fe);
 965                         kfree (fe);
 966                         return 0;
 967                 }
 968         }
 969
 970         up (&frontend_mutex);
 971         return -EINVAL;
 972 }
 973
 974 MODULE_PARM(dvb_frontend_debug,"i");
 975 MODULE_PARM(dvb_shutdown_timeout,"i");
 976 MODULE_PARM_DESC(dvb_frontend_debug, "enable verbose debug messages");
 977 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
 978