SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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", __func__);
 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", __func__);
 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", __func__);
 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                 __func__, 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", __func__);
 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                                 || freezing(current),
 532                         fepriv->delay);
 533
 534                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 535                         /* got signal or quitting */
 536                         break;
 537                 }
 538
 539                 if (try_to_freeze())
 540                         goto restart;
 541
 542                 if (down_interruptible(&fepriv->sem))
 543                         break;
 544
 545                 if (fepriv->reinitialise) {
 546                         dvb_frontend_init(fe);
 547                         if (fepriv->tone != -1) {
 548                                 fe->ops.set_tone(fe, fepriv->tone);
 549                         }
 550                         if (fepriv->voltage != -1) {
 551                                 fe->ops.set_voltage(fe, fepriv->voltage);
 552                         }
 553                         fepriv->reinitialise = 0;
 554                 }
 555
 556                 /* do an iteration of the tuning loop */
 557                 if (fe->ops.get_frontend_algo) {
 558                         if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
 559                                 /* have we been asked to retune? */
 560                                 params = NULL;
 561                                 if (fepriv->state & FESTATE_RETUNE) {
 562                                         params = &fepriv->parameters;
 563                                         fepriv->state = FESTATE_TUNED;
 564                                 }
 565
 566                                 fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
 567                                 if (s != fepriv->status) {
 568                                         dvb_frontend_add_event(fe, s);
 569                                         fepriv->status = s;
 570                                 }
 571                         } else
 572                                 dvb_frontend_swzigzag(fe);
 573                 } else
 574                         dvb_frontend_swzigzag(fe);
 575         }
 576
 577         if (dvb_powerdown_on_sleep) {
 578                 if (fe->ops.set_voltage)
 579                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 580                 if (fe->ops.tuner_ops.sleep) {
 581                         fe->ops.tuner_ops.sleep(fe);
 582                         if (fe->ops.i2c_gate_ctrl)
 583                                 fe->ops.i2c_gate_ctrl(fe, 0);
 584                 }
 585                 if (fe->ops.sleep)
 586                         fe->ops.sleep(fe);
 587         }
 588
 589         fepriv->thread = NULL;
 590         mb();
 591
 592         dvb_frontend_wakeup(fe);
 593         return 0;
 594 }
 595
 596 static void dvb_frontend_stop(struct dvb_frontend *fe)
 597 {
 598         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 599
 600         dprintk ("%s\n", __func__);
 601
 602         fepriv->exit = 1;
 603         mb();
 604
 605         if (!fepriv->thread)
 606                 return;
 607
 608         kthread_stop(fepriv->thread);
 609
 610         init_MUTEX (&fepriv->sem);
 611         fepriv->state = FESTATE_IDLE;
 612
 613         /* paranoia check in case a signal arrived */
 614         if (fepriv->thread)
 615                 printk("dvb_frontend_stop: warning: thread %p won't exit\n",
 616                                 fepriv->thread);
 617 }
 618
 619 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
 620 {
 621         return ((curtime.tv_usec < lasttime.tv_usec) ?
 622                 1000000 - lasttime.tv_usec + curtime.tv_usec :
 623                 curtime.tv_usec - lasttime.tv_usec);
 624 }
 625 EXPORT_SYMBOL(timeval_usec_diff);
 626
 627 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
 628 {
 629         curtime->tv_usec += add_usec;
 630         if (curtime->tv_usec >= 1000000) {
 631                 curtime->tv_usec -= 1000000;
 632                 curtime->tv_sec++;
 633         }
 634 }
 635
 636 /*
 637  * Sleep until gettimeofday() > waketime + add_usec
 638  * This needs to be as precise as possible, but as the delay is
 639  * usually between 2ms and 32ms, it is done using a scheduled msleep
 640  * followed by usleep (normally a busy-wait loop) for the remainder
 641  */
 642 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
 643 {
 644         struct timeval lasttime;
 645         s32 delta, newdelta;
 646
 647         timeval_usec_add(waketime, add_usec);
 648
 649         do_gettimeofday(&lasttime);
 650         delta = timeval_usec_diff(lasttime, *waketime);
 651         if (delta > 2500) {
 652                 msleep((delta - 1500) / 1000);
 653                 do_gettimeofday(&lasttime);
 654                 newdelta = timeval_usec_diff(lasttime, *waketime);
 655                 delta = (newdelta > delta) ? 0 : newdelta;
 656         }
 657         if (delta > 0)
 658                 udelay(delta);
 659 }
 660 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 661
 662 static int dvb_frontend_start(struct dvb_frontend *fe)
 663 {
 664         int ret;
 665         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 666         struct task_struct *fe_thread;
 667
 668         dprintk ("%s\n", __func__);
 669
 670         if (fepriv->thread) {
 671                 if (!fepriv->exit)
 672                         return 0;
 673                 else
 674                         dvb_frontend_stop (fe);
 675         }
 676
 677         if (signal_pending(current))
 678                 return -EINTR;
 679         if (down_interruptible (&fepriv->sem))
 680                 return -EINTR;
 681
 682         fepriv->state = FESTATE_IDLE;
 683         fepriv->exit = 0;
 684         fepriv->thread = NULL;
 685         mb();
 686
 687         fe_thread = kthread_run(dvb_frontend_thread, fe,
 688                 "kdvb-fe-%i", fe->dvb->num);
 689         if (IS_ERR(fe_thread)) {
 690                 ret = PTR_ERR(fe_thread);
 691                 printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
 692                 up(&fepriv->sem);
 693                 return ret;
 694         }
 695         fepriv->thread = fe_thread;
 696         return 0;
 697 }
 698
 699 static void dvb_frontend_get_frequeny_limits(struct dvb_frontend *fe,
 700                                         u32 *freq_min, u32 *freq_max)
 701 {
 702         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 703
 704         if (fe->ops.info.frequency_max == 0)
 705                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 706         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 707                 *freq_max = fe->ops.info.frequency_max;
 708         else
 709                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 710
 711         if (*freq_min == 0 || *freq_max == 0)
 712                 printk(KERN_WARNING "DVB: frontend %u frequency limits undefined - fix the driver\n",
 713                        fe->dvb->num);
 714 }
 715
 716 static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
 717                                 struct dvb_frontend_parameters *parms)
 718 {
 719         u32 freq_min;
 720         u32 freq_max;
 721
 722         /* range check: frequency */
 723         dvb_frontend_get_frequeny_limits(fe, &freq_min, &freq_max);
 724         if ((freq_min && parms->frequency < freq_min) ||
 725             (freq_max && parms->frequency > freq_max)) {
 726                 printk(KERN_WARNING "DVB: frontend %u frequency %u out of range (%u..%u)\n",
 727                        fe->dvb->num, parms->frequency, freq_min, freq_max);
 728                 return -EINVAL;
 729         }
 730
 731         /* range check: symbol rate */
 732         if (fe->ops.info.type == FE_QPSK) {
 733                 if ((fe->ops.info.symbol_rate_min &&
 734                      parms->u.qpsk.symbol_rate < fe->ops.info.symbol_rate_min) ||
 735                     (fe->ops.info.symbol_rate_max &&
 736                      parms->u.qpsk.symbol_rate > fe->ops.info.symbol_rate_max)) {
 737                         printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
 738                                fe->dvb->num, parms->u.qpsk.symbol_rate,
 739                                fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
 740                         return -EINVAL;
 741                 }
 742
 743         } else if (fe->ops.info.type == FE_QAM) {
 744                 if ((fe->ops.info.symbol_rate_min &&
 745                      parms->u.qam.symbol_rate < fe->ops.info.symbol_rate_min) ||
 746                     (fe->ops.info.symbol_rate_max &&
 747                      parms->u.qam.symbol_rate > fe->ops.info.symbol_rate_max)) {
 748                         printk(KERN_WARNING "DVB: frontend %u symbol rate %u out of range (%u..%u)\n",
 749                                fe->dvb->num, parms->u.qam.symbol_rate,
 750                                fe->ops.info.symbol_rate_min, fe->ops.info.symbol_rate_max);
 751                         return -EINVAL;
 752                 }
 753         }
 754
 755         return 0;
 756 }
 757
 758 struct tv_cmds_h tv_cmds[] = {
 759         [TV_SEQ_UNDEFINED] = {
 760                 .name   = "TV_SEQ_UNDEFINED",
 761                 .cmd    = TV_SEQ_UNDEFINED,
 762                 .set    = 1,
 763         },
 764         [TV_SEQ_START] = {
 765                 .name   = "TV_SEQ_START",
 766                 .cmd    = TV_SEQ_START,
 767                 .set    = 1,
 768         },
 769         [TV_SEQ_CONTINUE] = {
 770                 .name   = "TV_SEQ_CONTINUE",
 771                 .cmd    = TV_SEQ_CONTINUE,
 772                 .set    = 1,
 773         },
 774         [TV_SEQ_COMPLETE] = {
 775                 .name   = "TV_SEQ_COMPLETE",
 776                 .cmd    = TV_SEQ_COMPLETE,
 777                 .set    = 1,
 778         },
 779         [TV_SEQ_TERMINATE] = {
 780                 .name   = "TV_SEQ_TERMINATE",
 781                 .cmd    = TV_SEQ_TERMINATE,
 782                 .set    = 1,
 783         },
 784
 785         /* Set */
 786         [TV_SET_FREQUENCY] = {
 787                 .name   = "TV_SET_FREQUENCY",
 788                 .cmd    = TV_SET_FREQUENCY,
 789                 .set    = 1,
 790         },
 791         [TV_SET_BANDWIDTH] = {
 792                 .name   = "TV_SET_BANDWIDTH",
 793                 .cmd    = TV_SET_BANDWIDTH,
 794                 .set    = 1,
 795         },
 796         [TV_SET_MODULATION] = {
 797                 .name   = "TV_SET_MODULATION",
 798                 .cmd    = TV_SET_MODULATION,
 799                 .set    = 1,
 800         },
 801         [TV_SET_INVERSION] = {
 802                 .name   = "TV_SET_INVERSION",
 803                 .cmd    = TV_SET_INVERSION,
 804                 .set    = 1,
 805         },
 806         [TV_SET_DISEQC_MASTER] = {
 807                 .name   = "TV_SET_DISEQC_MASTER",
 808                 .cmd    = TV_SET_DISEQC_MASTER,
 809                 .set    = 1,
 810                 .buffer = 1,
 811         },
 812         [TV_SET_SYMBOLRATE] = {
 813                 .name   = "TV_SET_SYMBOLRATE",
 814                 .cmd    = TV_SET_SYMBOLRATE,
 815                 .set    = 1,
 816         },
 817         [TV_SET_INNERFEC] = {
 818                 .name   = "TV_SET_INNERFEC",
 819                 .cmd    = TV_SET_INNERFEC,
 820                 .set    = 1,
 821         },
 822         [TV_SET_VOLTAGE] = {
 823                 .name   = "TV_SET_VOLTAGE",
 824                 .cmd    = TV_SET_VOLTAGE,
 825                 .set    = 1,
 826         },
 827         [TV_SET_TONE] = {
 828                 .name   = "TV_SET_TONE",
 829                 .cmd    = TV_SET_TONE,
 830                 .set    = 1,
 831         },
 832         [TV_SET_PILOT] = {
 833                 .name   = "TV_SET_PILOT",
 834                 .cmd    = TV_SET_PILOT,
 835                 .set    = 1,
 836         },
 837         [TV_SET_ROLLOFF] = {
 838                 .name   = "TV_SET_ROLLOFF",
 839                 .cmd    = TV_SET_ROLLOFF,
 840                 .set    = 1,
 841         },
 842         [TV_SET_DELIVERY_SYSTEM] = {
 843                 .name   = "TV_SET_DELIVERY_SYSTEM",
 844                 .cmd    = TV_SET_DELIVERY_SYSTEM,
 845                 .set    = 1,
 846         },
 847         [TV_SET_ISDB_SEGMENT_NUM] = {
 848                 .name   = "TV_SET_ISDB_SEGMENT_NUM",
 849                 .cmd    = TV_SET_ISDB_SEGMENT_NUM,
 850                 .set    = 1,
 851         },
 852         [TV_SET_ISDB_SEGMENT_WIDTH] = {
 853                 .name   = "TV_SET_ISDB_SEGMENT_WIDTH",
 854                 .cmd    = TV_SET_ISDB_SEGMENT_WIDTH,
 855                 .set    = 1,
 856         },
 857
 858         /* Get */
 859         [TV_GET_FREQUENCY] = {
 860                 .name   = "TV_GET_FREQUENCY",
 861                 .cmd    = TV_GET_FREQUENCY,
 862                 .set    = 0,
 863         },
 864         [TV_GET_BANDWIDTH] = {
 865                 .name   = "TV_GET_BANDWIDTH",
 866                 .cmd    = TV_GET_BANDWIDTH,
 867                 .set    = 0,
 868         },
 869         [TV_GET_MODULATION] = {
 870                 .name   = "TV_GET_MODULATION",
 871                 .cmd    = TV_GET_MODULATION,
 872                 .set    = 0,
 873         },
 874         [TV_GET_INVERSION] = {
 875                 .name   = "TV_GET_INVERSION",
 876                 .cmd    = TV_GET_INVERSION,
 877                 .set    = 0,
 878         },
 879         [TV_GET_DISEQC_SLAVE_REPLY] = {
 880                 .name   = "TV_GET_DISEQC_SLAVE_REPLY",
 881                 .cmd    = TV_GET_DISEQC_SLAVE_REPLY,
 882                 .set    = 0,
 883                 .buffer = 1,
 884         },
 885         [TV_GET_SYMBOLRATE] = {
 886                 .name   = "TV_GET_SYMBOLRATE",
 887                 .cmd    = TV_GET_SYMBOLRATE,
 888                 .set    = 0,
 889         },
 890         [TV_GET_INNERFEC] = {
 891                 .name   = "TV_GET_INNERFEC",
 892                 .cmd    = TV_GET_INNERFEC,
 893                 .set    = 0,
 894         },
 895         [TV_GET_VOLTAGE] = {
 896                 .name   = "TV_GET_VOLTAGE",
 897                 .cmd    = TV_GET_VOLTAGE,
 898                 .set    = 0,
 899         },
 900         [TV_GET_TONE] = {
 901                 .name   = "TV_GET_TONE",
 902                 .cmd    = TV_GET_TONE,
 903                 .set    = 0,
 904         },
 905         [TV_GET_PILOT] = {
 906                 .name   = "TV_GET_PILOT",
 907                 .cmd    = TV_GET_PILOT,
 908                 .set    = 0,
 909         },
 910         [TV_GET_ROLLOFF] = {
 911                 .name   = "TV_GET_ROLLOFF",
 912                 .cmd    = TV_GET_ROLLOFF,
 913                 .set    = 0,
 914         },
 915         [TV_GET_DELIVERY_SYSTEM] = {
 916                 .name   = "TV_GET_DELIVERY_SYSTEM",
 917                 .cmd    = TV_GET_DELIVERY_SYSTEM,
 918                 .set    = 0,
 919         },
 920         [TV_GET_ISDB_SEGMENT_NUM] = {
 921                 .name   = "TV_GET_ISDB_SEGMENT_NUM",
 922                 .cmd    = TV_GET_ISDB_SEGMENT_NUM,
 923                 .set    = 0,
 924         },
 925         [TV_GET_ISDB_SEGMENT_WIDTH] = {
 926                 .name   = "TV_GET_ISDB_SEGMENT_WIDTH",
 927                 .cmd    = TV_GET_ISDB_SEGMENT_WIDTH,
 928                 .set    = 0,
 929         },
 930         [TV_GET_ISDB_LAYERA_FEC] = {
 931                 .name   = "TV_GET_ISDB_LAYERA_FEC",
 932                 .cmd    = TV_GET_ISDB_LAYERA_FEC,
 933                 .set    = 0,
 934         },
 935         [TV_GET_ISDB_LAYERA_MODULATION] = {
 936                 .name   = "TV_GET_ISDB_LAYERA_MODULATION",
 937                 .cmd    = TV_GET_ISDB_LAYERA_MODULATION,
 938                 .set    = 0,
 939         },
 940         [TV_GET_ISDB_LAYERA_SEGMENT_WIDTH] = {
 941                 .name   = "TV_GET_ISDB_LAYERA_SEGMENT_WIDTH",
 942                 .cmd    = TV_GET_ISDB_LAYERA_SEGMENT_WIDTH,
 943                 .set    = 0,
 944         },
 945         [TV_GET_ISDB_LAYERB_FEC] = {
 946                 .name   = "TV_GET_ISDB_LAYERB_FEC",
 947                 .cmd    = TV_GET_ISDB_LAYERB_FEC,
 948                 .set    = 0,
 949         },
 950         [TV_GET_ISDB_LAYERB_MODULATION] = {
 951                 .name   = "TV_GET_ISDB_LAYERB_MODULATION",
 952                 .cmd    = TV_GET_ISDB_LAYERB_MODULATION,
 953                 .set    = 0,
 954         },
 955         [TV_GET_ISDB_LAYERB_SEGMENT_WIDTH] = {
 956                 .name   = "TV_GET_ISDB_LAYERB_SEGMENT_WIDTH",
 957                 .cmd    = TV_GET_ISDB_LAYERB_SEGMENT_WIDTH,
 958                 .set    = 0,
 959         },
 960         [TV_GET_ISDB_LAYERC_FEC] = {
 961                 .name   = "TV_GET_ISDB_LAYERC_FEC",
 962                 .cmd    = TV_GET_ISDB_LAYERC_FEC,
 963                 .set    = 0,
 964         },
 965         [TV_GET_ISDB_LAYERC_MODULATION] = {
 966                 .name   = "TV_GET_ISDB_LAYERC_MODULATION",
 967                 .cmd    = TV_GET_ISDB_LAYERC_MODULATION,
 968                 .set    = 0,
 969         },
 970         [TV_GET_ISDB_LAYERC_SEGMENT_WIDTH] = {
 971                 .name   = "TV_GET_ISDB_LAYERC_SEGMENT_WIDTH",
 972                 .cmd    = TV_GET_ISDB_LAYERC_SEGMENT_WIDTH,
 973                 .set    = 0,
 974         },
 975 };
 976
 977 void tv_property_dump(tv_property_t *tvp)
 978 {
 979         int i;
 980
 981         printk("%s() tvp.cmd    = 0x%08x (%s)\n"
 982                 ,__FUNCTION__
 983                 ,tvp->cmd
 984                 ,tv_cmds[ tvp->cmd ].name);
 985
 986         if(tv_cmds[ tvp->cmd ].buffer) {
 987
 988                 printk("%s() tvp.u.buffer.len = 0x%02x\n"
 989                         ,__FUNCTION__
 990                         ,tvp->u.buffer.len);
 991
 992                 for(i = 0; i < tvp->u.buffer.len; i++)
 993                         printk("%s() tvp.u.buffer.data[0x%02x] = 0x%02x\n"
 994                                 ,__FUNCTION__
 995                                 ,i
 996                                 ,tvp->u.buffer.data[i]);
 997
 998         } else
 999                 printk("%s() tvp.u.data = 0x%08x\n", __FUNCTION__, tvp->u.data);
1000 }
1001
1002 int is_legacy_delivery_system(fe_delivery_system_t s)
1003 {
1004         if((s == SYS_UNDEFINED) || (s == SYS_DVBC_ANNEX_AC) ||
1005                 (s == SYS_DVBC_ANNEX_B) || (s == SYS_DVBT) || (s == SYS_DVBS))
1006                 return 1;
1007
1008         return 0;
1009 }
1010
1011 int tv_property_cache_submit(struct dvb_frontend *fe)
1012 {
1013
1014         /* We have to do one of two things:
1015          * To support legacy devices using the new API we take values from
1016          * the tv_cache and generate a legacy truning structure.
1017          *
1018          * Or,
1019          *
1020          * To support advanced tuning devices with the new API we
1021          * notify the new advance driver type that a tuning operation is required
1022          * and let it pull values from the cache as is, we don't need to
1023          * pass structures.
1024          *
1025          * We'll use the modulation type to assess how this is handled. as the API
1026          * progresses we'll probably want to have a flag in dvb_frontend_ops
1027          * to allow the frontend driver to dictate how it likes to be tuned.
1028          *
1029          * Because of how this is attached to the ioctl handler for legacy support,
1030          * it's important to return an appropriate result code with atleast the following
1031          * three meanings:
1032          * < 0 = processing error
1033          *   0 = lecagy ioctl handler to submit a traditional set_frontend() call.
1034          *   1 = lecagy ioctl handler should NOT submit a traditional set_frontend() call.
1035          */
1036
1037         int r;
1038
1039         struct tv_frontend_properties *c = &fe->tv_property_cache;
1040         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1041         struct dvb_frontend_parameters p;
1042
1043         printk("%s()\n", __FUNCTION__);
1044
1045         /* For legacy delivery systems we don't need the delivery_system to be specified */
1046         if(is_legacy_delivery_system(c->delivery_system)) {
1047                 switch(c->modulation) {
1048                 case QPSK:
1049                         printk("%s() Preparing QPSK req\n", __FUNCTION__);
1050                         p.frequency = c->frequency;
1051                         p.inversion = c->inversion;
1052                         p.u.qpsk.symbol_rate = c->symbol_rate;
1053                         p.u.qpsk.fec_inner = c->fec_inner;
1054                         memcpy(&fepriv->parameters, &p,
1055                                 sizeof (struct dvb_frontend_parameters));
1056
1057                         /* Call the traditional tuning mechanisms. */
1058
1059                         r = 0;
1060                         break;
1061                 case QAM_16:
1062                 case QAM_32:
1063                 case QAM_64:
1064                 case QAM_128:
1065                 case QAM_256:
1066                 case QAM_AUTO:
1067                         printk("%s() Preparing QAM req\n", __FUNCTION__);
1068                         p.frequency = c->frequency;
1069                         p.inversion = c->inversion;
1070                         p.u.qam.symbol_rate = c->symbol_rate;
1071                         p.u.vsb.modulation = c->modulation;
1072                         printk("%s() frequency = %d\n", __FUNCTION__, p.frequency);
1073                         printk("%s() QAM       = %d\n", __FUNCTION__, p.u.vsb.modulation);
1074                         memcpy(&fepriv->parameters, &p,
1075                                 sizeof (struct dvb_frontend_parameters));
1076
1077                         /* At this point we're fully formed for backwards
1078                          * compatability and we need to return this
1079                          * via the ioctl handler as SET_FRONTEND (arg).
1080                          * We've already patched the new values into the
1081                          * frontends tuning structures so the ioctl code just
1082                          * continues as if a legacy tune structure was passed
1083                          * from userspace.
1084                          */
1085
1086                         r = 0;
1087                         break;
1088                 case VSB_8:
1089                 case VSB_16:
1090                         printk("%s() Preparing VSB req\n", __FUNCTION__);
1091                         p.frequency = c->frequency;
1092                         p.u.vsb.modulation = c->modulation;
1093                         memcpy(&fepriv->parameters, &p,
1094                                 sizeof (struct dvb_frontend_parameters));
1095
1096                         /* Call the traditional tuning mechanisms. */
1097
1098                         r = 0;
1099                         break;
1100                 /* TODO: Add any missing modulation types */
1101                 default:
1102                         r = -1;
1103                 }
1104         } else {
1105                 /* For advanced delivery systems / modulation types ...
1106                  * we seed the lecacy dvb_frontend_parameters structure
1107                  * so that the sanity checking code later in the IOCTL processing
1108                  * can validate our basic frequency ranges, symbolrates, modulation
1109                  * etc.
1110                  */
1111                 r = -1;
1112
1113                 switch(c->modulation) {
1114                 case _8PSK:
1115                 case _16APSK:
1116                 case NBC_QPSK:
1117                         /* Just post a notification to the demod driver and let it pull
1118                          * the specific values it wants from its tv_property_cache.
1119                          * It can decide how best to use those parameters.
1120                          * IOCTL will call set_frontend (by default) due to zigzag
1121                          * support etc.
1122                          */
1123                         if (fe->ops.set_params)
1124                                 r = fe->ops.set_params(fe);
1125
1126                         p.frequency = c->frequency;
1127                         p.inversion = c->inversion;
1128                         p.u.qpsk.symbol_rate = c->symbol_rate;
1129                         p.u.qpsk.fec_inner = c->fec_inner;
1130                         memcpy(&fepriv->parameters, &p,
1131                                 sizeof (struct dvb_frontend_parameters));
1132
1133                         r = 0;
1134                         break;
1135                 default:
1136                         r = -1;
1137                 }
1138
1139                 if(c->delivery_system == SYS_ISDBT) {
1140                         /* Fake out a generic DVB-T request so we pass validation in the ioctl */
1141                         p.frequency = c->frequency;
1142                         p.inversion = INVERSION_AUTO;
1143                         p.u.ofdm.constellation = QAM_AUTO;
1144                         p.u.ofdm.code_rate_HP = FEC_AUTO;
1145                         p.u.ofdm.code_rate_LP = FEC_AUTO;
1146                         p.u.ofdm.bandwidth = BANDWIDTH_AUTO;
1147                         p.u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
1148                         p.u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
1149                         p.u.ofdm.hierarchy_information = HIERARCHY_AUTO;
1150                         memcpy(&fepriv->parameters, &p,
1151                                 sizeof (struct dvb_frontend_parameters));
1152
1153                         r = 0;
1154                 }
1155         }
1156         return r;
1157 }
1158
1159 int tv_property_process(struct dvb_frontend *fe, tv_property_t *tvp)
1160 {
1161         int r = 0;
1162         printk("%s()\n", __FUNCTION__);
1163         tv_property_dump(tvp);
1164
1165         switch(tvp->cmd) {
1166         case TV_SEQ_START:
1167         case TV_SEQ_TERMINATE:
1168                 /* Reset a cache of data specific to the frontend here. This does
1169                  * not effect hardware.
1170                  */
1171                 printk("%s() Flushing property cache\n", __FUNCTION__);
1172                 memset(&fe->tv_property_cache, 0, sizeof(struct tv_frontend_properties));
1173                 fe->tv_property_cache.state = TV_SEQ_START;
1174                 fe->tv_property_cache.delivery_system = SYS_UNDEFINED;
1175                 break;
1176         case TV_SEQ_COMPLETE:
1177                 /* interpret the cache of data, build either a traditional frontend
1178                  * tunerequest and submit it to a subset of the ioctl handler,
1179                  * or, call a new undefined method on the frontend to deal with
1180                  * all new tune requests.
1181                  */
1182                 fe->tv_property_cache.state = TV_SEQ_COMPLETE;
1183                 printk("%s() Finalised property cache\n", __FUNCTION__);
1184                 r = tv_property_cache_submit(fe);
1185                 break;
1186         case TV_SET_FREQUENCY:
1187                 fe->tv_property_cache.frequency = tvp->u.data;
1188                 break;
1189         case TV_GET_FREQUENCY:
1190                 tvp->u.data = fe->tv_property_cache.frequency;
1191                 break;
1192         case TV_SET_MODULATION:
1193                 fe->tv_property_cache.modulation = tvp->u.data;
1194                 break;
1195         case TV_GET_MODULATION:
1196                 tvp->u.data = fe->tv_property_cache.modulation;
1197                 break;
1198         case TV_SET_BANDWIDTH:
1199                 fe->tv_property_cache.bandwidth = tvp->u.data;
1200                 break;
1201         case TV_GET_BANDWIDTH:
1202                 tvp->u.data = fe->tv_property_cache.bandwidth;
1203                 break;
1204         case TV_SET_INVERSION:
1205                 fe->tv_property_cache.inversion = tvp->u.data;
1206                 break;
1207         case TV_GET_INVERSION:
1208                 tvp->u.data = fe->tv_property_cache.inversion;
1209                 break;
1210         case TV_SET_SYMBOLRATE:
1211                 fe->tv_property_cache.symbol_rate = tvp->u.data;
1212                 break;
1213         case TV_GET_SYMBOLRATE:
1214                 tvp->u.data = fe->tv_property_cache.symbol_rate;
1215                 break;
1216         case TV_SET_INNERFEC:
1217                 fe->tv_property_cache.fec_inner = tvp->u.data;
1218                 break;
1219         case TV_GET_INNERFEC:
1220                 tvp->u.data = fe->tv_property_cache.fec_inner;
1221                 break;
1222         case TV_SET_PILOT:
1223                 fe->tv_property_cache.pilot = tvp->u.data;
1224                 break;
1225         case TV_GET_PILOT:
1226                 tvp->u.data = fe->tv_property_cache.pilot;
1227                 break;
1228         case TV_SET_ROLLOFF:
1229                 fe->tv_property_cache.rolloff = tvp->u.data;
1230                 break;
1231         case TV_GET_ROLLOFF:
1232                 tvp->u.data = fe->tv_property_cache.rolloff;
1233                 break;
1234         case TV_SET_DELIVERY_SYSTEM:
1235                 fe->tv_property_cache.delivery_system = tvp->u.data;
1236                 break;
1237         case TV_GET_DELIVERY_SYSTEM:
1238                 tvp->u.data = fe->tv_property_cache.delivery_system;
1239                 break;
1240
1241         /* ISDB-T Support here */
1242         case TV_SET_ISDB_SEGMENT_NUM:
1243                 fe->tv_property_cache.isdb_segment_num = tvp->u.data;
1244                 break;
1245         case TV_GET_ISDB_SEGMENT_NUM:
1246                 tvp->u.data = fe->tv_property_cache.isdb_segment_num;
1247                 break;
1248         case TV_SET_ISDB_SEGMENT_WIDTH:
1249                 fe->tv_property_cache.isdb_segment_width = tvp->u.data;
1250                 break;
1251         case TV_GET_ISDB_SEGMENT_WIDTH:
1252                 tvp->u.data = fe->tv_property_cache.isdb_segment_width;
1253                 break;
1254         case TV_GET_ISDB_LAYERA_FEC:
1255                 tvp->u.data = fe->tv_property_cache.isdb_layera_fec;
1256                 break;
1257         case TV_GET_ISDB_LAYERA_MODULATION:
1258                 tvp->u.data = fe->tv_property_cache.isdb_layera_modulation;
1259                 break;
1260         case TV_GET_ISDB_LAYERA_SEGMENT_WIDTH:
1261                 tvp->u.data = fe->tv_property_cache.isdb_layera_segment_width;
1262                 break;
1263         case TV_GET_ISDB_LAYERB_FEC:
1264                 tvp->u.data = fe->tv_property_cache.isdb_layerb_fec;
1265                 break;
1266         case TV_GET_ISDB_LAYERB_MODULATION:
1267                 tvp->u.data = fe->tv_property_cache.isdb_layerb_modulation;
1268                 break;
1269         case TV_GET_ISDB_LAYERB_SEGMENT_WIDTH:
1270                 tvp->u.data = fe->tv_property_cache.isdb_layerb_segment_width;
1271                 break;
1272         case TV_GET_ISDB_LAYERC_FEC:
1273                 tvp->u.data = fe->tv_property_cache.isdb_layerc_fec;
1274                 break;
1275         case TV_GET_ISDB_LAYERC_MODULATION:
1276                 tvp->u.data = fe->tv_property_cache.isdb_layerc_modulation;
1277                 break;
1278         case TV_GET_ISDB_LAYERC_SEGMENT_WIDTH:
1279                 tvp->u.data = fe->tv_property_cache.isdb_layerc_segment_width;
1280                 break;
1281
1282         }
1283
1284         return 0;
1285 }
1286
1287 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
1288                         unsigned int cmd, void *parg)
1289 {
1290         struct dvb_device *dvbdev = file->private_data;
1291         struct dvb_frontend *fe = dvbdev->priv;
1292         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1293         int err = -EOPNOTSUPP;
1294         tv_property_t* tvp;
1295
1296         dprintk ("%s\n", __func__);
1297
1298         if (fepriv->exit)
1299                 return -ENODEV;
1300
1301         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
1302             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
1303              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
1304                 return -EPERM;
1305
1306         if (down_interruptible (&fepriv->sem))
1307                 return -ERESTARTSYS;
1308
1309         if(cmd == FE_SET_PROPERTY) {
1310                 printk("%s() FE_SET_PROPERTY\n", __FUNCTION__);
1311
1312                 /* TODO: basic property validation here */
1313
1314                 /* TODO: ioctl userdata out of range check here */
1315                 tvp = parg;
1316                 while(tvp->cmd != TV_SEQ_UNDEFINED) {
1317                         tv_property_process(fe, tvp);
1318                         if( (tvp->cmd == TV_SEQ_TERMINATE) || (tvp->cmd == TV_SEQ_COMPLETE) )
1319                                 break;
1320                         tvp++;
1321                 }
1322
1323                 if(fe->tv_property_cache.state == TV_SEQ_COMPLETE) {
1324                         printk("%s() Property cache is full, tuning\n", __FUNCTION__);
1325                         cmd = FE_SET_FRONTEND;
1326                 }
1327                 err = 0;
1328         }
1329
1330         switch (cmd) {
1331         case FE_GET_INFO: {
1332                 struct dvb_frontend_info* info = parg;
1333                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
1334                 dvb_frontend_get_frequeny_limits(fe, &info->frequency_min, &info->frequency_max);
1335
1336                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
1337                  * do it, it is done for it. */
1338                 info->caps |= FE_CAN_INVERSION_AUTO;
1339                 err = 0;
1340                 break;
1341         }
1342
1343         case FE_READ_STATUS: {
1344                 fe_status_t* status = parg;
1345
1346                 /* if retune was requested but hasn't occured yet, prevent
1347                  * that user get signal state from previous tuning */
1348                 if(fepriv->state == FESTATE_RETUNE) {
1349                         err=0;
1350                         *status = 0;
1351                         break;
1352                 }
1353
1354                 if (fe->ops.read_status)
1355                         err = fe->ops.read_status(fe, status);
1356                 break;
1357         }
1358         case FE_READ_BER:
1359                 if (fe->ops.read_ber)
1360                         err = fe->ops.read_ber(fe, (__u32*) parg);
1361                 break;
1362
1363         case FE_READ_SIGNAL_STRENGTH:
1364                 if (fe->ops.read_signal_strength)
1365                         err = fe->ops.read_signal_strength(fe, (__u16*) parg);
1366                 break;
1367
1368         case FE_READ_SNR:
1369                 if (fe->ops.read_snr)
1370                         err = fe->ops.read_snr(fe, (__u16*) parg);
1371                 break;
1372
1373         case FE_READ_UNCORRECTED_BLOCKS:
1374                 if (fe->ops.read_ucblocks)
1375                         err = fe->ops.read_ucblocks(fe, (__u32*) parg);
1376                 break;
1377
1378
1379         case FE_DISEQC_RESET_OVERLOAD:
1380                 if (fe->ops.diseqc_reset_overload) {
1381                         err = fe->ops.diseqc_reset_overload(fe);
1382                         fepriv->state = FESTATE_DISEQC;
1383                         fepriv->status = 0;
1384                 }
1385                 break;
1386
1387         case FE_DISEQC_SEND_MASTER_CMD:
1388                 if (fe->ops.diseqc_send_master_cmd) {
1389                         err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
1390                         fepriv->state = FESTATE_DISEQC;
1391                         fepriv->status = 0;
1392                 }
1393                 break;
1394
1395         case FE_DISEQC_SEND_BURST:
1396                 if (fe->ops.diseqc_send_burst) {
1397                         err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
1398                         fepriv->state = FESTATE_DISEQC;
1399                         fepriv->status = 0;
1400                 }
1401                 break;
1402
1403         case FE_SET_TONE:
1404                 if (fe->ops.set_tone) {
1405                         err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
1406                         fepriv->tone = (fe_sec_tone_mode_t) parg;
1407                         fepriv->state = FESTATE_DISEQC;
1408                         fepriv->status = 0;
1409                 }
1410                 break;
1411
1412         case FE_SET_VOLTAGE:
1413                 if (fe->ops.set_voltage) {
1414                         err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
1415                         fepriv->voltage = (fe_sec_voltage_t) parg;
1416                         fepriv->state = FESTATE_DISEQC;
1417                         fepriv->status = 0;
1418                 }
1419                 break;
1420
1421         case FE_DISHNETWORK_SEND_LEGACY_CMD:
1422                 if (fe->ops.dishnetwork_send_legacy_command) {
1423                         err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
1424                         fepriv->state = FESTATE_DISEQC;
1425                         fepriv->status = 0;
1426                 } else if (fe->ops.set_voltage) {
1427                         /*
1428                          * NOTE: This is a fallback condition.  Some frontends
1429                          * (stv0299 for instance) take longer than 8msec to
1430                          * respond to a set_voltage command.  Those switches
1431                          * need custom routines to switch properly.  For all
1432                          * other frontends, the following shoule work ok.
1433                          * Dish network legacy switches (as used by Dish500)
1434                          * are controlled by sending 9-bit command words
1435                          * spaced 8msec apart.
1436                          * the actual command word is switch/port dependant
1437                          * so it is up to the userspace application to send
1438                          * the right command.
1439                          * The command must always start with a '0' after
1440                          * initialization, so parg is 8 bits and does not
1441                          * include the initialization or start bit
1442                          */
1443                         unsigned long swcmd = ((unsigned long) parg) << 1;
1444                         struct timeval nexttime;
1445                         struct timeval tv[10];
1446                         int i;
1447                         u8 last = 1;
1448                         if (dvb_frontend_debug)
1449                                 printk("%s switch command: 0x%04lx\n", __func__, swcmd);
1450                         do_gettimeofday(&nexttime);
1451                         if (dvb_frontend_debug)
1452                                 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
1453                         /* before sending a command, initialize by sending
1454                          * a 32ms 18V to the switch
1455                          */
1456                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
1457                         dvb_frontend_sleep_until(&nexttime, 32000);
1458
1459                         for (i = 0; i < 9; i++) {
1460                                 if (dvb_frontend_debug)
1461                                         do_gettimeofday(&tv[i + 1]);
1462                                 if ((swcmd & 0x01) != last) {
1463                                         /* set voltage to (last ? 13V : 18V) */
1464                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
1465                                         last = (last) ? 0 : 1;
1466                                 }
1467                                 swcmd = swcmd >> 1;
1468                                 if (i != 8)
1469                                         dvb_frontend_sleep_until(&nexttime, 8000);
1470                         }
1471                         if (dvb_frontend_debug) {
1472                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
1473                                         __func__, fe->dvb->num);
1474                                 for (i = 1; i < 10; i++)
1475                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
1476                         }
1477                         err = 0;
1478                         fepriv->state = FESTATE_DISEQC;
1479                         fepriv->status = 0;
1480                 }
1481                 break;
1482
1483         case FE_DISEQC_RECV_SLAVE_REPLY:
1484                 if (fe->ops.diseqc_recv_slave_reply)
1485                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
1486                 break;
1487
1488         case FE_ENABLE_HIGH_LNB_VOLTAGE:
1489                 if (fe->ops.enable_high_lnb_voltage)
1490                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
1491                 break;
1492
1493         case FE_SET_FRONTEND: {
1494                 struct dvb_frontend_tune_settings fetunesettings;
1495
1496                 if(fe->tv_property_cache.state == TV_SEQ_COMPLETE) {
1497                         if (dvb_frontend_check_parameters(fe, &fepriv->parameters) < 0) {
1498                                 err = -EINVAL;
1499                                 break;
1500                         }
1501                 } else {
1502                         if (dvb_frontend_check_parameters(fe, parg) < 0) {
1503                                 err = -EINVAL;
1504                                 break;
1505                         }
1506
1507                         memcpy (&fepriv->parameters, parg,
1508                                 sizeof (struct dvb_frontend_parameters));
1509                 }
1510
1511                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
1512                 memcpy(&fetunesettings.parameters, parg,
1513                        sizeof (struct dvb_frontend_parameters));
1514
1515                 /* force auto frequency inversion if requested */
1516                 if (dvb_force_auto_inversion) {
1517                         fepriv->parameters.inversion = INVERSION_AUTO;
1518                         fetunesettings.parameters.inversion = INVERSION_AUTO;
1519                 }
1520                 if (fe->ops.info.type == FE_OFDM) {
1521                         /* without hierarchical coding code_rate_LP is irrelevant,
1522                          * so we tolerate the otherwise invalid FEC_NONE setting */
1523                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
1524                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
1525                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
1526                 }
1527
1528                 /* get frontend-specific tuning settings */
1529                 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1530                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1531                         fepriv->max_drift = fetunesettings.max_drift;
1532                         fepriv->step_size = fetunesettings.step_size;
1533                 } else {
1534                         /* default values */
1535                         switch(fe->ops.info.type) {
1536                         case FE_QPSK:
1537                                 fepriv->min_delay = HZ/20;
1538                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
1539                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
1540                                 break;
1541
1542                         case FE_QAM:
1543                                 fepriv->min_delay = HZ/20;
1544                                 fepriv->step_size = 0; /* no zigzag */
1545                                 fepriv->max_drift = 0;
1546                                 break;
1547
1548                         case FE_OFDM:
1549                                 fepriv->min_delay = HZ/20;
1550                                 fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
1551                                 fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
1552                                 break;
1553                         case FE_ATSC:
1554                                 fepriv->min_delay = HZ/20;
1555                                 fepriv->step_size = 0;
1556                                 fepriv->max_drift = 0;
1557                                 break;
1558                         }
1559                 }
1560                 if (dvb_override_tune_delay > 0)
1561                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1562
1563                 fepriv->state = FESTATE_RETUNE;
1564                 dvb_frontend_wakeup(fe);
1565                 dvb_frontend_add_event(fe, 0);
1566                 fepriv->status = 0;
1567                 err = 0;
1568                 break;
1569         }
1570
1571         case FE_GET_EVENT:
1572                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
1573                 break;
1574
1575         case FE_GET_FRONTEND:
1576                 if (fe->ops.get_frontend) {
1577                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
1578                         err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
1579                 }
1580                 break;
1581
1582         case FE_SET_FRONTEND_TUNE_MODE:
1583                 fepriv->tune_mode_flags = (unsigned long) parg;
1584                 err = 0;
1585                 break;
1586         };
1587
1588         up (&fepriv->sem);
1589         return err;
1590 }
1591
1592
1593 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
1594 {
1595         struct dvb_device *dvbdev = file->private_data;
1596         struct dvb_frontend *fe = dvbdev->priv;
1597         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1598
1599         dprintk ("%s\n", __func__);
1600
1601         poll_wait (file, &fepriv->events.wait_queue, wait);
1602
1603         if (fepriv->events.eventw != fepriv->events.eventr)
1604                 return (POLLIN | POLLRDNORM | POLLPRI);
1605
1606         return 0;
1607 }
1608
1609 static int dvb_frontend_open(struct inode *inode, struct file *file)
1610 {
1611         struct dvb_device *dvbdev = file->private_data;
1612         struct dvb_frontend *fe = dvbdev->priv;
1613         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1614         int ret;
1615
1616         dprintk ("%s\n", __func__);
1617
1618         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
1619                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
1620                         return ret;
1621         }
1622
1623         if ((ret = dvb_generic_open (inode, file)) < 0)
1624                 goto err1;
1625
1626         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
1627                 /* normal tune mode when opened R/W */
1628                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
1629                 fepriv->tone = -1;
1630                 fepriv->voltage = -1;
1631
1632                 ret = dvb_frontend_start (fe);
1633                 if (ret)
1634                         goto err2;
1635
1636                 /*  empty event queue */
1637                 fepriv->events.eventr = fepriv->events.eventw = 0;
1638         }
1639
1640         return ret;
1641
1642 err2:
1643         dvb_generic_release(inode, file);
1644 err1:
1645         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
1646                 fe->ops.ts_bus_ctrl(fe, 0);
1647         return ret;
1648 }
1649
1650 static int dvb_frontend_release(struct inode *inode, struct file *file)
1651 {
1652         struct dvb_device *dvbdev = file->private_data;
1653         struct dvb_frontend *fe = dvbdev->priv;
1654         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1655         int ret;
1656
1657         dprintk ("%s\n", __func__);
1658
1659         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1660                 fepriv->release_jiffies = jiffies;
1661
1662         ret = dvb_generic_release (inode, file);
1663
1664         if (dvbdev->users == -1) {
1665                 if (fepriv->exit == 1) {
1666                         fops_put(file->f_op);
1667                         file->f_op = NULL;
1668                         wake_up(&dvbdev->wait_queue);
1669                 }
1670                 if (fe->ops.ts_bus_ctrl)
1671                         fe->ops.ts_bus_ctrl(fe, 0);
1672         }
1673
1674         return ret;
1675 }
1676
1677 static struct file_operations dvb_frontend_fops = {
1678         .owner          = THIS_MODULE,
1679         .ioctl          = dvb_generic_ioctl,
1680         .poll           = dvb_frontend_poll,
1681         .open           = dvb_frontend_open,
1682         .release        = dvb_frontend_release
1683 };
1684
1685 int dvb_register_frontend(struct dvb_adapter* dvb,
1686                           struct dvb_frontend* fe)
1687 {
1688         struct dvb_frontend_private *fepriv;
1689         static const struct dvb_device dvbdev_template = {
1690                 .users = ~0,
1691                 .writers = 1,
1692                 .readers = (~0)-1,
1693                 .fops = &dvb_frontend_fops,
1694                 .kernel_ioctl = dvb_frontend_ioctl
1695         };
1696
1697         dprintk ("%s\n", __func__);
1698
1699         if (mutex_lock_interruptible(&frontend_mutex))
1700                 return -ERESTARTSYS;
1701
1702         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1703         if (fe->frontend_priv == NULL) {
1704                 mutex_unlock(&frontend_mutex);
1705                 return -ENOMEM;
1706         }
1707         fepriv = fe->frontend_priv;
1708
1709         init_MUTEX (&fepriv->sem);
1710         init_waitqueue_head (&fepriv->wait_queue);
1711         init_waitqueue_head (&fepriv->events.wait_queue);
1712         mutex_init(&fepriv->events.mtx);
1713         fe->dvb = dvb;
1714         fepriv->inversion = INVERSION_OFF;
1715
1716         printk ("DVB: registering frontend %i (%s)...\n",
1717                 fe->dvb->num,
1718                 fe->ops.info.name);
1719
1720         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1721                              fe, DVB_DEVICE_FRONTEND);
1722
1723         mutex_unlock(&frontend_mutex);
1724         return 0;
1725 }
1726 EXPORT_SYMBOL(dvb_register_frontend);
1727
1728 int dvb_unregister_frontend(struct dvb_frontend* fe)
1729 {
1730         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1731         dprintk ("%s\n", __func__);
1732
1733         mutex_lock(&frontend_mutex);
1734         dvb_frontend_stop (fe);
1735         mutex_unlock(&frontend_mutex);
1736
1737         if (fepriv->dvbdev->users < -1)
1738                 wait_event(fepriv->dvbdev->wait_queue,
1739                                 fepriv->dvbdev->users==-1);
1740
1741         mutex_lock(&frontend_mutex);
1742         dvb_unregister_device (fepriv->dvbdev);
1743
1744         /* fe is invalid now */
1745         kfree(fepriv);
1746         mutex_unlock(&frontend_mutex);
1747         return 0;
1748 }
1749 EXPORT_SYMBOL(dvb_unregister_frontend);
1750
1751 #ifdef CONFIG_MEDIA_ATTACH
1752 void dvb_frontend_detach(struct dvb_frontend* fe)
1753 {
1754         void *ptr;
1755
1756         if (fe->ops.release_sec) {
1757                 fe->ops.release_sec(fe);
1758                 symbol_put_addr(fe->ops.release_sec);
1759         }
1760         if (fe->ops.tuner_ops.release) {
1761                 fe->ops.tuner_ops.release(fe);
1762                 symbol_put_addr(fe->ops.tuner_ops.release);
1763         }
1764         if (fe->ops.analog_ops.release) {
1765                 fe->ops.analog_ops.release(fe);
1766                 symbol_put_addr(fe->ops.analog_ops.release);
1767         }
1768         ptr = (void*)fe->ops.release;
1769         if (ptr) {
1770                 fe->ops.release(fe);
1771                 symbol_put_addr(ptr);
1772         }
1773 }
1774 #else
1775 void dvb_frontend_detach(struct dvb_frontend* fe)
1776 {
1777         if (fe->ops.release_sec)
1778                 fe->ops.release_sec(fe);
1779         if (fe->ops.tuner_ops.release)
1780                 fe->ops.tuner_ops.release(fe);
1781         if (fe->ops.analog_ops.release)
1782                 fe->ops.analog_ops.release(fe);
1783         if (fe->ops.release)
1784                 fe->ops.release(fe);
1785 }
1786 #endif
1787 EXPORT_SYMBOL(dvb_frontend_detach);