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

   1 /*
   2  * dvb_frontend.c: DVB frontend tuning interface/thread
   3  *
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  26  */
  27
  28 #include <linux/string.h>
  29 #include <linux/kernel.h>
  30 #include <linux/sched.h>
  31 #include <linux/wait.h>
  32 #include <linux/slab.h>
  33 #include <linux/poll.h>
  34 #include <linux/module.h>
  35 #include <linux/list.h>
  36 #include <linux/freezer.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/kthread.h>
  39 #include <asm/processor.h>
  40
  41 #include "dvb_frontend.h"
  42 #include "dvbdev.h"
  43
  44 static int dvb_frontend_debug;
  45 static int dvb_shutdown_timeout;
  46 static int dvb_force_auto_inversion;
  47 static int dvb_override_tune_delay;
  48 static int dvb_powerdown_on_sleep = 1;
  49
  50 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  51 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  52 module_param(dvb_shutdown_timeout, int, 0644);
  53 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  54 module_param(dvb_force_auto_inversion, int, 0644);
  55 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  56 module_param(dvb_override_tune_delay, int, 0644);
  57 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  58 module_param(dvb_powerdown_on_sleep, int, 0644);
  59 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  60
  61 #define dprintk if (dvb_frontend_debug) printk
  62
  63 #define FESTATE_IDLE 1
  64 #define FESTATE_RETUNE 2
  65 #define FESTATE_TUNING_FAST 4
  66 #define FESTATE_TUNING_SLOW 8
  67 #define FESTATE_TUNED 16
  68 #define FESTATE_ZIGZAG_FAST 32
  69 #define FESTATE_ZIGZAG_SLOW 64
  70 #define FESTATE_DISEQC 128
  71 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  72 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  73 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  74 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  75
  76 #define FE_ALGO_HW              1
  77 /*
  78  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  79  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  80  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  81  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  82  * FESTATE_TUNED. The frontend has successfully locked on.
  83  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  84  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  85  * FESTATE_DISEQC. A DISEQC command has just been issued.
  86  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  87  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  88  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  89  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  90  */
  91
  92 static DEFINE_MUTEX(frontend_mutex);
  93
  94 struct dvb_frontend_private {
  95
  96         /* thread/frontend values */
  97         struct dvb_device *dvbdev;
  98         struct dvb_frontend_parameters parameters;
  99         struct dvb_fe_events events;
 100         struct semaphore sem;
 101         struct list_head list_head;
 102         wait_queue_head_t wait_queue;
 103         struct task_struct *thread;
 104         unsigned long release_jiffies;
 105         unsigned int exit;
 106         unsigned int wakeup;
 107         fe_status_t status;
 108         unsigned long tune_mode_flags;
 109         unsigned int delay;
 110         unsigned int reinitialise;
 111         int tone;
 112         int voltage;
 113
 114         /* swzigzag values */
 115         unsigned int state;
 116         unsigned int bending;
 117         int lnb_drift;
 118         unsigned int inversion;
 119         unsigned int auto_step;
 120         unsigned int auto_sub_step;
 121         unsigned int started_auto_step;
 122         unsigned int min_delay;
 123         unsigned int max_drift;
 124         unsigned int step_size;
 125         int quality;
 126         unsigned int check_wrapped;
 127 };
 128
 129 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 130
 131 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 132 {
 133         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 134         struct dvb_fe_events *events = &fepriv->events;
 135         struct dvb_frontend_event *e;
 136         int wp;
 137
 138         dprintk ("%s\n", __FUNCTION__);
 139
 140         if (mutex_lock_interruptible (&events->mtx))
 141                 return;
 142
 143         wp = (events->eventw + 1) % MAX_EVENT;
 144
 145         if (wp == events->eventr) {
 146                 events->overflow = 1;
 147                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 148         }
 149
 150         e = &events->events[events->eventw];
 151
 152         memcpy (&e->parameters, &fepriv->parameters,
 153                 sizeof (struct dvb_frontend_parameters));
 154
 155         if (status & FE_HAS_LOCK)
 156                 if (fe->ops.get_frontend)
 157                         fe->ops.get_frontend(fe, &e->parameters);
 158
 159         events->eventw = wp;
 160
 161         mutex_unlock(&events->mtx);
 162
 163         e->status = status;
 164
 165         wake_up_interruptible (&events->wait_queue);
 166 }
 167
 168 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 169                             struct dvb_frontend_event *event, int flags)
 170 {
 171         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 172         struct dvb_fe_events *events = &fepriv->events;
 173
 174         dprintk ("%s\n", __FUNCTION__);
 175
 176         if (events->overflow) {
 177                 events->overflow = 0;
 178                 return -EOVERFLOW;
 179         }
 180
 181         if (events->eventw == events->eventr) {
 182                 int ret;
 183
 184                 if (flags & O_NONBLOCK)
 185                         return -EWOULDBLOCK;
 186
 187                 up(&fepriv->sem);
 188
 189                 ret = wait_event_interruptible (events->wait_queue,
 190                                                 events->eventw != events->eventr);
 191
 192                 if (down_interruptible (&fepriv->sem))
 193                         return -ERESTARTSYS;
 194
 195                 if (ret < 0)
 196                         return ret;
 197         }
 198
 199         if (mutex_lock_interruptible (&events->mtx))
 200                 return -ERESTARTSYS;
 201
 202         memcpy (event, &events->events[events->eventr],
 203                 sizeof(struct dvb_frontend_event));
 204
 205         events->eventr = (events->eventr + 1) % MAX_EVENT;
 206
 207         mutex_unlock(&events->mtx);
 208
 209         return 0;
 210 }
 211
 212 static void dvb_frontend_init(struct dvb_frontend *fe)
 213 {
 214         dprintk ("DVB: initialising frontend %i (%s)...\n",
 215                  fe->dvb->num,
 216                  fe->ops.info.name);
 217
 218         if (fe->ops.init)
 219                 fe->ops.init(fe);
 220         if (fe->ops.tuner_ops.init) {
 221                 fe->ops.tuner_ops.init(fe);
 222                 if (fe->ops.i2c_gate_ctrl)
 223                         fe->ops.i2c_gate_ctrl(fe, 0);
 224         }
 225 }
 226
 227 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 228 {
 229         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 230
 231         fepriv->reinitialise = 1;
 232         dvb_frontend_wakeup(fe);
 233 }
 234 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 235
 236 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 237 {
 238         int q2;
 239
 240         dprintk ("%s\n", __FUNCTION__);
 241
 242         if (locked)
 243                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 244         else
 245                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 246
 247         q2 = fepriv->quality - 128;
 248         q2 *= q2;
 249
 250         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 251 }
 252
 253 /**
 254  * Performs automatic twiddling of frontend parameters.
 255  *
 256  * @param fe The frontend concerned.
 257  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 258  * @returns Number of complete iterations that have been performed.
 259  */
 260 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 261 {
 262         int autoinversion;
 263         int ready = 0;
 264         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 265         int original_inversion = fepriv->parameters.inversion;
 266         u32 original_frequency = fepriv->parameters.frequency;
 267
 268         /* are we using autoinversion? */
 269         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 270                          (fepriv->parameters.inversion == INVERSION_AUTO));
 271
 272         /* setup parameters correctly */
 273         while(!ready) {
 274                 /* calculate the lnb_drift */
 275                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 276
 277                 /* wrap the auto_step if we've exceeded the maximum drift */
 278                 if (fepriv->lnb_drift > fepriv->max_drift) {
 279                         fepriv->auto_step = 0;
 280                         fepriv->auto_sub_step = 0;
 281                         fepriv->lnb_drift = 0;
 282                 }
 283
 284                 /* perform inversion and +/- zigzag */
 285                 switch(fepriv->auto_sub_step) {
 286                 case 0:
 287                         /* try with the current inversion and current drift setting */
 288                         ready = 1;
 289                         break;
 290
 291                 case 1:
 292                         if (!autoinversion) break;
 293
 294                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 295                         ready = 1;
 296                         break;
 297
 298                 case 2:
 299                         if (fepriv->lnb_drift == 0) break;
 300
 301                         fepriv->lnb_drift = -fepriv->lnb_drift;
 302                         ready = 1;
 303                         break;
 304
 305                 case 3:
 306                         if (fepriv->lnb_drift == 0) break;
 307                         if (!autoinversion) break;
 308
 309                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 310                         fepriv->lnb_drift = -fepriv->lnb_drift;
 311                         ready = 1;
 312                         break;
 313
 314                 default:
 315                         fepriv->auto_step++;
 316                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 317                         break;
 318                 }
 319
 320                 if (!ready) fepriv->auto_sub_step++;
 321         }
 322
 323         /* if this attempt would hit where we started, indicate a complete
 324          * iteration has occurred */
 325         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 326             (fepriv->auto_sub_step == 0) && check_wrapped) {
 327                 return 1;
 328         }
 329
 330         dprintk("%s: drift:%i inversion:%i auto_step:%i "
 331                 "auto_sub_step:%i started_auto_step:%i\n",
 332                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
 333                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
 334
 335         /* set the frontend itself */
 336         fepriv->parameters.frequency += fepriv->lnb_drift;
 337         if (autoinversion)
 338                 fepriv->parameters.inversion = fepriv->inversion;
 339         if (fe->ops.set_frontend)
 340                 fe->ops.set_frontend(fe, &fepriv->parameters);
 341
 342         fepriv->parameters.frequency = original_frequency;
 343         fepriv->parameters.inversion = original_inversion;
 344
 345         fepriv->auto_sub_step++;
 346         return 0;
 347 }
 348
 349 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 350 {
 351         fe_status_t s = 0;
 352         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 353
 354         /* if we've got no parameters, just keep idling */
 355         if (fepriv->state & FESTATE_IDLE) {
 356                 fepriv->delay = 3*HZ;
 357                 fepriv->quality = 0;
 358                 return;
 359         }
 360
 361         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 362         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 363                 if (fepriv->state & FESTATE_RETUNE) {
 364                         if (fe->ops.set_frontend)
 365                                 fe->ops.set_frontend(fe, &fepriv->parameters);
 366                         fepriv->state = FESTATE_TUNED;
 367                 }
 368                 fepriv->delay = 3*HZ;
 369                 fepriv->quality = 0;
 370                 return;
 371         }
 372
 373         /* get the frontend status */
 374         if (fepriv->state & FESTATE_RETUNE) {
 375                 s = 0;
 376         } else {
 377                 if (fe->ops.read_status)
 378                         fe->ops.read_status(fe, &s);
 379                 if (s != fepriv->status) {
 380                         dvb_frontend_add_event(fe, s);
 381                         fepriv->status = s;
 382                 }
 383         }
 384
 385         /* if we're not tuned, and we have a lock, move to the TUNED state */
 386         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 387                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 388                 fepriv->state = FESTATE_TUNED;
 389
 390                 /* if we're tuned, then we have determined the correct inversion */
 391                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 392                     (fepriv->parameters.inversion == INVERSION_AUTO)) {
 393                         fepriv->parameters.inversion = fepriv->inversion;
 394                 }
 395                 return;
 396         }
 397
 398         /* if we are tuned already, check we're still locked */
 399         if (fepriv->state & FESTATE_TUNED) {
 400                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 401
 402                 /* we're tuned, and the lock is still good... */
 403                 if (s & FE_HAS_LOCK) {
 404                         return;
 405                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 406                         fepriv->state = FESTATE_ZIGZAG_FAST;
 407                         fepriv->started_auto_step = fepriv->auto_step;
 408                         fepriv->check_wrapped = 0;
 409                 }
 410         }
 411
 412         /* don't actually do anything if we're in the LOSTLOCK state,
 413          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 414         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 415             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 416                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 417                 return;
 418         }
 419
 420         /* don't do anything if we're in the DISEQC state, since this
 421          * might be someone with a motorized dish controlled by DISEQC.
 422          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 423         if (fepriv->state & FESTATE_DISEQC) {
 424                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 425                 return;
 426         }
 427
 428         /* if we're in the RETUNE state, set everything up for a brand
 429          * new scan, keeping the current inversion setting, as the next
 430          * tune is _very_ likely to require the same */
 431         if (fepriv->state & FESTATE_RETUNE) {
 432                 fepriv->lnb_drift = 0;
 433                 fepriv->auto_step = 0;
 434                 fepriv->auto_sub_step = 0;
 435                 fepriv->started_auto_step = 0;
 436                 fepriv->check_wrapped = 0;
 437         }
 438
 439         /* fast zigzag. */
 440         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 441                 fepriv->delay = fepriv->min_delay;
 442
 443                 /* peform a tune */
 444                 if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
 445                         /* OK, if we've run out of trials at the fast speed.
 446                          * Drop back to slow for the _next_ attempt */
 447                         fepriv->state = FESTATE_SEARCHING_SLOW;
 448                         fepriv->started_auto_step = fepriv->auto_step;
 449                         return;
 450                 }
 451                 fepriv->check_wrapped = 1;
 452
 453                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 454                  * This ensures we cannot return from an
 455                  * FE_SET_FRONTEND ioctl before the first frontend tune
 456                  * occurs */
 457                 if (fepriv->state & FESTATE_RETUNE) {
 458                         fepriv->state = FESTATE_TUNING_FAST;
 459                 }
 460         }
 461
 462         /* slow zigzag */
 463         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 464                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 465
 466                 /* Note: don't bother checking for wrapping; we stay in this
 467                  * state until we get a lock */
 468                 dvb_frontend_swzigzag_autotune(fe, 0);
 469         }
 470 }
 471
 472 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 473 {
 474         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 475
 476         if (fepriv->exit)
 477                 return 1;
 478
 479         if (fepriv->dvbdev->writers == 1)
 480                 if (time_after(jiffies, fepriv->release_jiffies +
 481                                   dvb_shutdown_timeout * HZ))
 482                         return 1;
 483
 484         return 0;
 485 }
 486
 487 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 488 {
 489         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 490
 491         if (fepriv->wakeup) {
 492                 fepriv->wakeup = 0;
 493                 return 1;
 494         }
 495         return dvb_frontend_is_exiting(fe);
 496 }
 497
 498 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 499 {
 500         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 501
 502         fepriv->wakeup = 1;
 503         wake_up_interruptible(&fepriv->wait_queue);
 504 }
 505
 506 static int dvb_frontend_thread(void *data)
 507 {
 508         struct dvb_frontend *fe = data;
 509         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 510         unsigned long timeout;
 511         fe_status_t s;
 512         struct dvb_frontend_parameters *params;
 513
 514         dprintk("%s\n", __FUNCTION__);
 515
 516         fepriv->check_wrapped = 0;
 517         fepriv->quality = 0;
 518         fepriv->delay = 3*HZ;
 519         fepriv->status = 0;
 520         fepriv->wakeup = 0;
 521         fepriv->reinitialise = 0;
 522
 523         dvb_frontend_init(fe);
 524
 525         set_freezable();
 526         while (1) {
 527                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 528 restart:
 529                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
 530                         dvb_frontend_should_wakeup(fe) || kthread_should_stop(),
 531                         fepriv->delay);
 532
 533                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 534                         /* got signal or quitting */
 535                         break;
 536                 }
 537
 538                 if (try_to_freeze())
 539                         goto restart;
 540
 541                 if (down_interruptible(&fepriv->sem))
 542                         break;
 543
 544                 if (fepriv->reinitialise) {
 545                         dvb_frontend_init(fe);
 546                         if (fepriv->tone != -1) {
 547                                 fe->ops.set_tone(fe, fepriv->tone);
 548                         }
 549                         if (fepriv->voltage != -1) {
 550                                 fe->ops.set_voltage(fe, fepriv->voltage);
 551                         }
 552                         fepriv->reinitialise = 0;
 553                 }
 554
 555                 /* do an iteration of the tuning loop */
 556                 if (fe->ops.get_frontend_algo) {
 557                         if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
 558                                 /* have we been asked to retune? */
 559                                 params = NULL;
 560                                 if (fepriv->state & FESTATE_RETUNE) {
 561                                         params = &fepriv->parameters;
 562                                         fepriv->state = FESTATE_TUNED;
 563                                 }
 564
 565                                 fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
 566                                 if (s != fepriv->status) {
 567                                         dvb_frontend_add_event(fe, s);
 568                                         fepriv->status = s;
 569                                 }
 570                         } else
 571                                 dvb_frontend_swzigzag(fe);
 572                 } else
 573                         dvb_frontend_swzigzag(fe);
 574         }
 575
 576         if (dvb_powerdown_on_sleep) {
 577                 if (fe->ops.set_voltage)
 578                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 579                 if (fe->ops.tuner_ops.sleep) {
 580                         fe->ops.tuner_ops.sleep(fe);
 581                         if (fe->ops.i2c_gate_ctrl)
 582                                 fe->ops.i2c_gate_ctrl(fe, 0);
 583                 }
 584                 if (fe->ops.sleep)
 585                         fe->ops.sleep(fe);
 586         }
 587
 588         fepriv->thread = NULL;
 589         mb();
 590
 591         dvb_frontend_wakeup(fe);
 592         return 0;
 593 }
 594
 595 static void dvb_frontend_stop(struct dvb_frontend *fe)
 596 {
 597         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 598
 599         dprintk ("%s\n", __FUNCTION__);
 600
 601         fepriv->exit = 1;
 602         mb();
 603
 604         if (!fepriv->thread)
 605                 return;
 606
 607         kthread_stop(fepriv->thread);
 608
 609         init_MUTEX (&fepriv->sem);
 610         fepriv->state = FESTATE_IDLE;
 611
 612         /* paranoia check in case a signal arrived */
 613         if (fepriv->thread)
 614                 printk("dvb_frontend_stop: warning: thread %p won't exit\n",
 615                                 fepriv->thread);
 616 }
 617
 618 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
 619 {
 620         return ((curtime.tv_usec < lasttime.tv_usec) ?
 621                 1000000 - lasttime.tv_usec + curtime.tv_usec :
 622                 curtime.tv_usec - lasttime.tv_usec);
 623 }
 624 EXPORT_SYMBOL(timeval_usec_diff);
 625
 626 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
 627 {
 628         curtime->tv_usec += add_usec;
 629         if (curtime->tv_usec >= 1000000) {
 630                 curtime->tv_usec -= 1000000;
 631                 curtime->tv_sec++;
 632         }
 633 }
 634
 635 /*
 636  * Sleep until gettimeofday() > waketime + add_usec
 637  * This needs to be as precise as possible, but as the delay is
 638  * usually between 2ms and 32ms, it is done using a scheduled msleep
 639  * followed by usleep (normally a busy-wait loop) for the remainder
 640  */
 641 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
 642 {
 643         struct timeval lasttime;
 644         s32 delta, newdelta;
 645
 646         timeval_usec_add(waketime, add_usec);
 647
 648         do_gettimeofday(&lasttime);
 649         delta = timeval_usec_diff(lasttime, *waketime);
 650         if (delta > 2500) {
 651                 msleep((delta - 1500) / 1000);
 652                 do_gettimeofday(&lasttime);
 653                 newdelta = timeval_usec_diff(lasttime, *waketime);
 654                 delta = (newdelta > delta) ? 0 : newdelta;
 655         }
 656         if (delta > 0)
 657                 udelay(delta);
 658 }
 659 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 660
 661 static int dvb_frontend_start(struct dvb_frontend *fe)
 662 {
 663         int ret;
 664         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 665         struct task_struct *fe_thread;
 666
 667         dprintk ("%s\n", __FUNCTION__);
 668
 669         if (fepriv->thread) {
 670                 if (!fepriv->exit)
 671                         return 0;
 672                 else
 673                         dvb_frontend_stop (fe);
 674         }
 675
 676         if (signal_pending(current))
 677                 return -EINTR;
 678         if (down_interruptible (&fepriv->sem))
 679                 return -EINTR;
 680
 681         fepriv->state = FESTATE_IDLE;
 682         fepriv->exit = 0;
 683         fepriv->thread = NULL;
 684         mb();
 685
 686         fe_thread = kthread_run(dvb_frontend_thread, fe,
 687                 "kdvb-fe-%i", fe->dvb->num);
 688         if (IS_ERR(fe_thread)) {
 689                 ret = PTR_ERR(fe_thread);
 690                 printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
 691                 up(&fepriv->sem);
 692                 return ret;
 693         }
 694         fepriv->thread = fe_thread;
 695         return 0;
 696 }
 697
 698 static void dvb_frontend_get_frequeny_limits(struct dvb_frontend *fe,
 699                                         u32 *freq_min, u32 *freq_max)
 700 {
 701         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 702
 703         if (fe->ops.info.frequency_max == 0)
 704                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 705         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 706                 *freq_max = fe->ops.info.frequency_max;
 707         else
 708                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 709
 710         if (*freq_min == 0 || *freq_max == 0)
 711                 printk(KERN_WARNING "DVB: frontend %u frequency limits undefined - fix the driver\n",
 712                        fe->dvb->num);
 713 }
 714
 715 static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
 716                                 struct dvb_frontend_parameters *parms)
 717 {
 718         u32 freq_min;
 719         u32 freq_max;
 720
 721         /* range check: frequency */
 722         dvb_frontend_get_frequeny_limits(fe, &freq_min, &freq_max);
 723         if ((freq_min && parms->frequency < freq_min) ||
 724             (freq_max && parms->frequency > freq_max)) {
 725                 printk(KERN_WARNING "DVB: frontend %u frequency %u out of range (%u..%u)\n",
 726                        fe->dvb->num, parms->frequency, freq_min, freq_max);
 727                 return -EINVAL;
 728         }
 729
 730         /* range check: symbol rate */
 731         if (fe->ops.info.type == FE_QPSK) {
 732                 if ((fe->ops.info.symbol_rate_min &&
 733                      parms->u.qpsk.symbol_rate < fe->ops.info.symbol_rate_min) ||
 734                     (fe->ops.info.symbol_rate_max &&
 735                      parms->u.qpsk.symbol_rate > fe->ops.info.symbol_rate_max)) {
 736                         printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
 737                                fe->dvb->num, parms->u.qpsk.symbol_rate,
 738                                fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
 739                         return -EINVAL;
 740                 }
 741
 742         } else if (fe->ops.info.type == FE_QAM) {
 743                 if ((fe->ops.info.symbol_rate_min &&
 744                      parms->u.qam.symbol_rate < fe->ops.info.symbol_rate_min) ||
 745                     (fe->ops.info.symbol_rate_max &&
 746                      parms->u.qam.symbol_rate > fe->ops.info.symbol_rate_max)) {
 747                         printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
 748                                fe->dvb->num, parms->u.qam.symbol_rate,
 749                                fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
 750                         return -EINVAL;
 751                 }
 752         }
 753
 754         return 0;
 755 }
 756
 757 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
 758                         unsigned int cmd, void *parg)
 759 {
 760         struct dvb_device *dvbdev = file->private_data;
 761         struct dvb_frontend *fe = dvbdev->priv;
 762         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 763         int err = -EOPNOTSUPP;
 764
 765         dprintk ("%s\n", __FUNCTION__);
 766
 767         if (fepriv->exit)
 768                 return -ENODEV;
 769
 770         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
 771             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
 772              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
 773                 return -EPERM;
 774
 775         if (down_interruptible (&fepriv->sem))
 776                 return -ERESTARTSYS;
 777
 778         switch (cmd) {
 779         case FE_GET_INFO: {
 780                 struct dvb_frontend_info* info = parg;
 781                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
 782                 dvb_frontend_get_frequeny_limits(fe, &info->frequency_min, &info->frequency_max);
 783
 784                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
 785                  * do it, it is done for it. */
 786                 info->caps |= FE_CAN_INVERSION_AUTO;
 787                 err = 0;
 788                 break;
 789         }
 790
 791         case FE_READ_STATUS: {
 792                 fe_status_t* status = parg;
 793
 794                 /* if retune was requested but hasn't occured yet, prevent
 795                  * that user get signal state from previous tuning */
 796                 if(fepriv->state == FESTATE_RETUNE) {
 797                         err=0;
 798                         *status = 0;
 799                         break;
 800                 }
 801
 802                 if (fe->ops.read_status)
 803                         err = fe->ops.read_status(fe, status);
 804                 break;
 805         }
 806         case FE_READ_BER:
 807                 if (fe->ops.read_ber)
 808                         err = fe->ops.read_ber(fe, (__u32*) parg);
 809                 break;
 810
 811         case FE_READ_SIGNAL_STRENGTH:
 812                 if (fe->ops.read_signal_strength)
 813                         err = fe->ops.read_signal_strength(fe, (__u16*) parg);
 814                 break;
 815
 816         case FE_READ_SNR:
 817                 if (fe->ops.read_snr)
 818                         err = fe->ops.read_snr(fe, (__u16*) parg);
 819                 break;
 820
 821         case FE_READ_UNCORRECTED_BLOCKS:
 822                 if (fe->ops.read_ucblocks)
 823                         err = fe->ops.read_ucblocks(fe, (__u32*) parg);
 824                 break;
 825
 826
 827         case FE_DISEQC_RESET_OVERLOAD:
 828                 if (fe->ops.diseqc_reset_overload) {
 829                         err = fe->ops.diseqc_reset_overload(fe);
 830                         fepriv->state = FESTATE_DISEQC;
 831                         fepriv->status = 0;
 832                 }
 833                 break;
 834
 835         case FE_DISEQC_SEND_MASTER_CMD:
 836                 if (fe->ops.diseqc_send_master_cmd) {
 837                         err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
 838                         fepriv->state = FESTATE_DISEQC;
 839                         fepriv->status = 0;
 840                 }
 841                 break;
 842
 843         case FE_DISEQC_SEND_BURST:
 844                 if (fe->ops.diseqc_send_burst) {
 845                         err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
 846                         fepriv->state = FESTATE_DISEQC;
 847                         fepriv->status = 0;
 848                 }
 849                 break;
 850
 851         case FE_SET_TONE:
 852                 if (fe->ops.set_tone) {
 853                         err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
 854                         fepriv->tone = (fe_sec_tone_mode_t) parg;
 855                         fepriv->state = FESTATE_DISEQC;
 856                         fepriv->status = 0;
 857                 }
 858                 break;
 859
 860         case FE_SET_VOLTAGE:
 861                 if (fe->ops.set_voltage) {
 862                         err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
 863                         fepriv->voltage = (fe_sec_voltage_t) parg;
 864                         fepriv->state = FESTATE_DISEQC;
 865                         fepriv->status = 0;
 866                 }
 867                 break;
 868
 869         case FE_DISHNETWORK_SEND_LEGACY_CMD:
 870                 if (fe->ops.dishnetwork_send_legacy_command) {
 871                         err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
 872                         fepriv->state = FESTATE_DISEQC;
 873                         fepriv->status = 0;
 874                 } else if (fe->ops.set_voltage) {
 875                         /*
 876                          * NOTE: This is a fallback condition.  Some frontends
 877                          * (stv0299 for instance) take longer than 8msec to
 878                          * respond to a set_voltage command.  Those switches
 879                          * need custom routines to switch properly.  For all
 880                          * other frontends, the following shoule work ok.
 881                          * Dish network legacy switches (as used by Dish500)
 882                          * are controlled by sending 9-bit command words
 883                          * spaced 8msec apart.
 884                          * the actual command word is switch/port dependant
 885                          * so it is up to the userspace application to send
 886                          * the right command.
 887                          * The command must always start with a '0' after
 888                          * initialization, so parg is 8 bits and does not
 889                          * include the initialization or start bit
 890                          */
 891                         unsigned long cmd = ((unsigned long) parg) << 1;
 892                         struct timeval nexttime;
 893                         struct timeval tv[10];
 894                         int i;
 895                         u8 last = 1;
 896                         if (dvb_frontend_debug)
 897                                 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
 898                         do_gettimeofday(&nexttime);
 899                         if (dvb_frontend_debug)
 900                                 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
 901                         /* before sending a command, initialize by sending
 902                          * a 32ms 18V to the switch
 903                          */
 904                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
 905                         dvb_frontend_sleep_until(&nexttime, 32000);
 906
 907                         for (i = 0; i < 9; i++) {
 908                                 if (dvb_frontend_debug)
 909                                         do_gettimeofday(&tv[i + 1]);
 910                                 if ((cmd & 0x01) != last) {
 911                                         /* set voltage to (last ? 13V : 18V) */
 912                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
 913                                         last = (last) ? 0 : 1;
 914                                 }
 915                                 cmd = cmd >> 1;
 916                                 if (i != 8)
 917                                         dvb_frontend_sleep_until(&nexttime, 8000);
 918                         }
 919                         if (dvb_frontend_debug) {
 920                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
 921                                         __FUNCTION__, fe->dvb->num);
 922                                 for (i = 1; i < 10; i++)
 923                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
 924                         }
 925                         err = 0;
 926                         fepriv->state = FESTATE_DISEQC;
 927                         fepriv->status = 0;
 928                 }
 929                 break;
 930
 931         case FE_DISEQC_RECV_SLAVE_REPLY:
 932                 if (fe->ops.diseqc_recv_slave_reply)
 933                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
 934                 break;
 935
 936         case FE_ENABLE_HIGH_LNB_VOLTAGE:
 937                 if (fe->ops.enable_high_lnb_voltage)
 938                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
 939                 break;
 940
 941         case FE_SET_FRONTEND: {
 942                 struct dvb_frontend_tune_settings fetunesettings;
 943
 944                 if (dvb_frontend_check_parameters(fe, parg) < 0) {
 945                         err = -EINVAL;
 946                         break;
 947                 }
 948
 949                 memcpy (&fepriv->parameters, parg,
 950                         sizeof (struct dvb_frontend_parameters));
 951
 952                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
 953                 memcpy(&fetunesettings.parameters, parg,
 954                        sizeof (struct dvb_frontend_parameters));
 955
 956                 /* force auto frequency inversion if requested */
 957                 if (dvb_force_auto_inversion) {
 958                         fepriv->parameters.inversion = INVERSION_AUTO;
 959                         fetunesettings.parameters.inversion = INVERSION_AUTO;
 960                 }
 961                 if (fe->ops.info.type == FE_OFDM) {
 962                         /* without hierarchical coding code_rate_LP is irrelevant,
 963                          * so we tolerate the otherwise invalid FEC_NONE setting */
 964                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
 965                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
 966                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
 967                 }
 968
 969                 /* get frontend-specific tuning settings */
 970                 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
 971                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
 972                         fepriv->max_drift = fetunesettings.max_drift;
 973                         fepriv->step_size = fetunesettings.step_size;
 974                 } else {
 975                         /* default values */
 976                         switch(fe->ops.info.type) {
 977                         case FE_QPSK:
 978                                 fepriv->min_delay = HZ/20;
 979                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
 980                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
 981                                 break;
 982
 983                         case FE_QAM:
 984                                 fepriv->min_delay = HZ/20;
 985                                 fepriv->step_size = 0; /* no zigzag */
 986                                 fepriv->max_drift = 0;
 987                                 break;
 988
 989                         case FE_OFDM:
 990                                 fepriv->min_delay = HZ/20;
 991                                 fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
 992                                 fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
 993                                 break;
 994                         case FE_ATSC:
 995                                 fepriv->min_delay = HZ/20;
 996                                 fepriv->step_size = 0;
 997                                 fepriv->max_drift = 0;
 998                                 break;
 999                         }
1000                 }
1001                 if (dvb_override_tune_delay > 0)
1002                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1003
1004                 fepriv->state = FESTATE_RETUNE;
1005                 dvb_frontend_wakeup(fe);
1006                 dvb_frontend_add_event(fe, 0);
1007                 fepriv->status = 0;
1008                 err = 0;
1009                 break;
1010         }
1011
1012         case FE_GET_EVENT:
1013                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
1014                 break;
1015
1016         case FE_GET_FRONTEND:
1017                 if (fe->ops.get_frontend) {
1018                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
1019                         err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
1020                 }
1021                 break;
1022
1023         case FE_SET_FRONTEND_TUNE_MODE:
1024                 fepriv->tune_mode_flags = (unsigned long) parg;
1025                 err = 0;
1026                 break;
1027         };
1028
1029         up (&fepriv->sem);
1030         return err;
1031 }
1032
1033 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
1034 {
1035         struct dvb_device *dvbdev = file->private_data;
1036         struct dvb_frontend *fe = dvbdev->priv;
1037         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1038
1039         dprintk ("%s\n", __FUNCTION__);
1040
1041         poll_wait (file, &fepriv->events.wait_queue, wait);
1042
1043         if (fepriv->events.eventw != fepriv->events.eventr)
1044                 return (POLLIN | POLLRDNORM | POLLPRI);
1045
1046         return 0;
1047 }
1048
1049 static int dvb_frontend_open(struct inode *inode, struct file *file)
1050 {
1051         struct dvb_device *dvbdev = file->private_data;
1052         struct dvb_frontend *fe = dvbdev->priv;
1053         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1054         int ret;
1055
1056         dprintk ("%s\n", __FUNCTION__);
1057
1058         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
1059                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
1060                         return ret;
1061         }
1062
1063         if ((ret = dvb_generic_open (inode, file)) < 0)
1064                 goto err1;
1065
1066         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
1067                 /* normal tune mode when opened R/W */
1068                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
1069                 fepriv->tone = -1;
1070                 fepriv->voltage = -1;
1071
1072                 ret = dvb_frontend_start (fe);
1073                 if (ret)
1074                         goto err2;
1075
1076                 /*  empty event queue */
1077                 fepriv->events.eventr = fepriv->events.eventw = 0;
1078         }
1079
1080         return ret;
1081
1082 err2:
1083         dvb_generic_release(inode, file);
1084 err1:
1085         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
1086                 fe->ops.ts_bus_ctrl(fe, 0);
1087         return ret;
1088 }
1089
1090 static int dvb_frontend_release(struct inode *inode, struct file *file)
1091 {
1092         struct dvb_device *dvbdev = file->private_data;
1093         struct dvb_frontend *fe = dvbdev->priv;
1094         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1095         int ret;
1096
1097         dprintk ("%s\n", __FUNCTION__);
1098
1099         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1100                 fepriv->release_jiffies = jiffies;
1101
1102         ret = dvb_generic_release (inode, file);
1103
1104         if (dvbdev->users == -1) {
1105                 if (fepriv->exit == 1) {
1106                         fops_put(file->f_op);
1107                         file->f_op = NULL;
1108                         wake_up(&dvbdev->wait_queue);
1109                 }
1110                 if (fe->ops.ts_bus_ctrl)
1111                         fe->ops.ts_bus_ctrl(fe, 0);
1112         }
1113
1114         return ret;
1115 }
1116
1117 static struct file_operations dvb_frontend_fops = {
1118         .owner          = THIS_MODULE,
1119         .ioctl          = dvb_generic_ioctl,
1120         .poll           = dvb_frontend_poll,
1121         .open           = dvb_frontend_open,
1122         .release        = dvb_frontend_release
1123 };
1124
1125 int dvb_register_frontend(struct dvb_adapter* dvb,
1126                           struct dvb_frontend* fe)
1127 {
1128         struct dvb_frontend_private *fepriv;
1129         static const struct dvb_device dvbdev_template = {
1130                 .users = ~0,
1131                 .writers = 1,
1132                 .readers = (~0)-1,
1133                 .fops = &dvb_frontend_fops,
1134                 .kernel_ioctl = dvb_frontend_ioctl
1135         };
1136
1137         dprintk ("%s\n", __FUNCTION__);
1138
1139         if (mutex_lock_interruptible(&frontend_mutex))
1140                 return -ERESTARTSYS;
1141
1142         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1143         if (fe->frontend_priv == NULL) {
1144                 mutex_unlock(&frontend_mutex);
1145                 return -ENOMEM;
1146         }
1147         fepriv = fe->frontend_priv;
1148
1149         init_MUTEX (&fepriv->sem);
1150         init_waitqueue_head (&fepriv->wait_queue);
1151         init_waitqueue_head (&fepriv->events.wait_queue);
1152         mutex_init(&fepriv->events.mtx);
1153         fe->dvb = dvb;
1154         fepriv->inversion = INVERSION_OFF;
1155
1156         printk ("DVB: registering frontend %i (%s)...\n",
1157                 fe->dvb->num,
1158                 fe->ops.info.name);
1159
1160         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1161                              fe, DVB_DEVICE_FRONTEND);
1162
1163         mutex_unlock(&frontend_mutex);
1164         return 0;
1165 }
1166 EXPORT_SYMBOL(dvb_register_frontend);
1167
1168 int dvb_unregister_frontend(struct dvb_frontend* fe)
1169 {
1170         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1171         dprintk ("%s\n", __FUNCTION__);
1172
1173         mutex_lock(&frontend_mutex);
1174         dvb_frontend_stop (fe);
1175         mutex_unlock(&frontend_mutex);
1176
1177         if (fepriv->dvbdev->users < -1)
1178                 wait_event(fepriv->dvbdev->wait_queue,
1179                                 fepriv->dvbdev->users==-1);
1180
1181         mutex_lock(&frontend_mutex);
1182         dvb_unregister_device (fepriv->dvbdev);
1183
1184         /* fe is invalid now */
1185         kfree(fepriv);
1186         mutex_unlock(&frontend_mutex);
1187         return 0;
1188 }
1189 EXPORT_SYMBOL(dvb_unregister_frontend);
1190
1191 #ifdef CONFIG_DVB_CORE_ATTACH
1192 void dvb_frontend_detach(struct dvb_frontend* fe)
1193 {
1194         void *ptr;
1195
1196         if (fe->ops.release_sec) {
1197                 fe->ops.release_sec(fe);
1198                 symbol_put_addr(fe->ops.release_sec);
1199         }
1200         if (fe->ops.tuner_ops.release) {
1201                 fe->ops.tuner_ops.release(fe);
1202                 symbol_put_addr(fe->ops.tuner_ops.release);
1203         }
1204         ptr = (void*)fe->ops.release;
1205         if (ptr) {
1206                 fe->ops.release(fe);
1207                 symbol_put_addr(ptr);
1208         }
1209 }
1210 #else
1211 void dvb_frontend_detach(struct dvb_frontend* fe)
1212 {
1213         if (fe->ops.release_sec)
1214                 fe->ops.release_sec(fe);
1215         if (fe->ops.tuner_ops.release)
1216                 fe->ops.tuner_ops.release(fe);
1217         if (fe->ops.release)
1218                 fe->ops.release(fe);
1219 }
1220 #endif
1221 EXPORT_SYMBOL(dvb_frontend_detach);