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/moduleparam.h>
  36 #include <linux/list.h>
  37 #include <linux/suspend.h>
  38 #include <linux/jiffies.h>
  39 #include <asm/processor.h>
  40 #include <asm/semaphore.h>
  41
  42 #include "dvb_frontend.h"
  43 #include "dvbdev.h"
  44
  45 static int dvb_frontend_debug;
  46 static int dvb_shutdown_timeout = 5;
  47 static int dvb_force_auto_inversion;
  48 static int dvb_override_tune_delay;
  49 static int dvb_powerdown_on_sleep = 1;
  50
  51 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  52 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  53 module_param(dvb_shutdown_timeout, int, 0444);
  54 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  55 module_param(dvb_force_auto_inversion, int, 0444);
  56 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  57 module_param(dvb_override_tune_delay, int, 0444);
  58 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  59 module_param(dvb_powerdown_on_sleep, int, 0444);
  60 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)");
  61
  62 #define dprintk if (dvb_frontend_debug) printk
  63
  64 #define FESTATE_IDLE 1
  65 #define FESTATE_RETUNE 2
  66 #define FESTATE_TUNING_FAST 4
  67 #define FESTATE_TUNING_SLOW 8
  68 #define FESTATE_TUNED 16
  69 #define FESTATE_ZIGZAG_FAST 32
  70 #define FESTATE_ZIGZAG_SLOW 64
  71 #define FESTATE_DISEQC 128
  72 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  73 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  74 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  75 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  76 /*
  77  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  78  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  79  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  80  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  81  * FESTATE_TUNED. The frontend has successfully locked on.
  82  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  83  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  84  * FESTATE_DISEQC. A DISEQC command has just been issued.
  85  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  86  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  87  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  88  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  89  */
  90
  91 static DECLARE_MUTEX(frontend_mutex);
  92
  93 struct dvb_frontend_private {
  94
  95         struct dvb_device *dvbdev;
  96         struct dvb_frontend_parameters parameters;
  97         struct dvb_fe_events events;
  98         struct semaphore sem;
  99         struct list_head list_head;
 100         wait_queue_head_t wait_queue;
 101         pid_t thread_pid;
 102         unsigned long release_jiffies;
 103         int state;
 104         int bending;
 105         int lnb_drift;
 106         int inversion;
 107         int auto_step;
 108         int auto_sub_step;
 109         int started_auto_step;
 110         int min_delay;
 111         int max_drift;
 112         int step_size;
 113         int exit;
 114         int wakeup;
 115         fe_status_t status;
 116 };
 117
 118
 119 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 120 {
 121         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 122         struct dvb_fe_events *events = &fepriv->events;
 123         struct dvb_frontend_event *e;
 124         int wp;
 125
 126         dprintk ("%s\n", __FUNCTION__);
 127
 128         if (down_interruptible (&events->sem))
 129                 return;
 130
 131         wp = (events->eventw + 1) % MAX_EVENT;
 132
 133         if (wp == events->eventr) {
 134                 events->overflow = 1;
 135                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 136         }
 137
 138         e = &events->events[events->eventw];
 139
 140         memcpy (&e->parameters, &fepriv->parameters,
 141                 sizeof (struct dvb_frontend_parameters));
 142
 143         if (status & FE_HAS_LOCK)
 144                 if (fe->ops->get_frontend)
 145                         fe->ops->get_frontend(fe, &e->parameters);
 146
 147         events->eventw = wp;
 148
 149         up (&events->sem);
 150
 151         e->status = status;
 152
 153         wake_up_interruptible (&events->wait_queue);
 154 }
 155
 156 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 157                             struct dvb_frontend_event *event, int flags)
 158 {
 159         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 160         struct dvb_fe_events *events = &fepriv->events;
 161
 162         dprintk ("%s\n", __FUNCTION__);
 163
 164         if (events->overflow) {
 165                 events->overflow = 0;
 166                 return -EOVERFLOW;
 167         }
 168
 169         if (events->eventw == events->eventr) {
 170                 int ret;
 171
 172                 if (flags & O_NONBLOCK)
 173                         return -EWOULDBLOCK;
 174
 175                 up(&fepriv->sem);
 176
 177                 ret = wait_event_interruptible (events->wait_queue,
 178                                                 events->eventw != events->eventr);
 179
 180                 if (down_interruptible (&fepriv->sem))
 181                         return -ERESTARTSYS;
 182
 183                 if (ret < 0)
 184                         return ret;
 185         }
 186
 187         if (down_interruptible (&events->sem))
 188                 return -ERESTARTSYS;
 189
 190         memcpy (event, &events->events[events->eventr],
 191                 sizeof(struct dvb_frontend_event));
 192
 193         events->eventr = (events->eventr + 1) % MAX_EVENT;
 194
 195         up (&events->sem);
 196
 197         return 0;
 198 }
 199
 200 static void dvb_frontend_init(struct dvb_frontend *fe)
 201 {
 202         dprintk ("DVB: initialising frontend %i (%s)...\n",
 203                  fe->dvb->num,
 204                  fe->ops->info.name);
 205
 206         if (fe->ops->init)
 207                 fe->ops->init(fe);
 208 }
 209
 210 static void update_delay(int *quality, int *delay, int min_delay, int locked)
 211 {
 212             int q2;
 213
 214             dprintk ("%s\n", __FUNCTION__);
 215
 216             if (locked)
 217                       (*quality) = (*quality * 220 + 36*256) / 256;
 218             else
 219                       (*quality) = (*quality * 220 + 0) / 256;
 220
 221             q2 = *quality - 128;
 222             q2 *= q2;
 223
 224             *delay = min_delay + q2 * HZ / (128*128);
 225 }
 226
 227 /**
 228  * Performs automatic twiddling of frontend parameters.
 229  *
 230  * @param fe The frontend concerned.
 231  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 232  * @returns Number of complete iterations that have been performed.
 233  */
 234 static int dvb_frontend_autotune(struct dvb_frontend *fe, int check_wrapped)
 235 {
 236         int autoinversion;
 237         int ready = 0;
 238         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 239         int original_inversion = fepriv->parameters.inversion;
 240         u32 original_frequency = fepriv->parameters.frequency;
 241
 242         /* are we using autoinversion? */
 243         autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 244                          (fepriv->parameters.inversion == INVERSION_AUTO));
 245
 246         /* setup parameters correctly */
 247         while(!ready) {
 248                 /* calculate the lnb_drift */
 249                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 250
 251                 /* wrap the auto_step if we've exceeded the maximum drift */
 252                 if (fepriv->lnb_drift > fepriv->max_drift) {
 253                         fepriv->auto_step = 0;
 254                         fepriv->auto_sub_step = 0;
 255                         fepriv->lnb_drift = 0;
 256                 }
 257
 258                 /* perform inversion and +/- zigzag */
 259                 switch(fepriv->auto_sub_step) {
 260                 case 0:
 261                         /* try with the current inversion and current drift setting */
 262                         ready = 1;
 263                         break;
 264
 265                 case 1:
 266                         if (!autoinversion) break;
 267
 268                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 269                         ready = 1;
 270                         break;
 271
 272                 case 2:
 273                         if (fepriv->lnb_drift == 0) break;
 274
 275                         fepriv->lnb_drift = -fepriv->lnb_drift;
 276                         ready = 1;
 277                         break;
 278
 279                 case 3:
 280                         if (fepriv->lnb_drift == 0) break;
 281                         if (!autoinversion) break;
 282
 283                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 284                         fepriv->lnb_drift = -fepriv->lnb_drift;
 285                         ready = 1;
 286                         break;
 287
 288                 default:
 289                         fepriv->auto_step++;
 290                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 291                         break;
 292                 }
 293
 294                 if (!ready) fepriv->auto_sub_step++;
 295         }
 296
 297         /* if this attempt would hit where we started, indicate a complete
 298          * iteration has occurred */
 299         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 300             (fepriv->auto_sub_step == 0) && check_wrapped) {
 301                 return 1;
 302         }
 303
 304         dprintk("%s: drift:%i inversion:%i auto_step:%i "
 305                 "auto_sub_step:%i started_auto_step:%i\n",
 306                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
 307                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
 308
 309         /* set the frontend itself */
 310         fepriv->parameters.frequency += fepriv->lnb_drift;
 311         if (autoinversion)
 312                 fepriv->parameters.inversion = fepriv->inversion;
 313         if (fe->ops->set_frontend)
 314                 fe->ops->set_frontend(fe, &fepriv->parameters);
 315
 316         fepriv->parameters.frequency = original_frequency;
 317         fepriv->parameters.inversion = original_inversion;
 318
 319         fepriv->auto_sub_step++;
 320         return 0;
 321 }
 322
 323 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 324 {
 325         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 326
 327         if (fepriv->exit)
 328                 return 1;
 329
 330         if (fepriv->dvbdev->writers == 1)
 331                 if (time_after(jiffies, fepriv->release_jiffies +
 332                                         dvb_shutdown_timeout * HZ))
 333                         return 1;
 334
 335         return 0;
 336 }
 337
 338 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 339 {
 340         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 341
 342         if (fepriv->wakeup) {
 343                 fepriv->wakeup = 0;
 344                 return 1;
 345         }
 346         return dvb_frontend_is_exiting(fe);
 347 }
 348
 349 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 350 {
 351         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 352
 353         fepriv->wakeup = 1;
 354         wake_up_interruptible(&fepriv->wait_queue);
 355 }
 356
 357 /*
 358  * FIXME: use linux/kthread.h
 359  */
 360 static int dvb_frontend_thread(void *data)
 361 {
 362         struct dvb_frontend *fe = data;
 363         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 364         unsigned long timeout;
 365         char name [15];
 366         int quality = 0, delay = 3*HZ;
 367         fe_status_t s;
 368         int check_wrapped = 0;
 369
 370         dprintk("%s\n", __FUNCTION__);
 371
 372         snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num);
 373
 374         lock_kernel();
 375         daemonize(name);
 376         sigfillset(&current->blocked);
 377         unlock_kernel();
 378
 379         fepriv->status = 0;
 380         dvb_frontend_init(fe);
 381         fepriv->wakeup = 0;
 382
 383         while (1) {
 384                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 385
 386                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
 387                                                            dvb_frontend_should_wakeup(fe),
 388                                                            delay);
 389                 if (0 != dvb_frontend_is_exiting(fe)) {
 390                         /* got signal or quitting */
 391                         break;
 392                 }
 393
 394                 try_to_freeze();
 395
 396                 if (down_interruptible(&fepriv->sem))
 397                         break;
 398
 399                 /* if we've got no parameters, just keep idling */
 400                 if (fepriv->state & FESTATE_IDLE) {
 401                         delay = 3*HZ;
 402                         quality = 0;
 403                         continue;
 404                 }
 405
 406                 /* get the frontend status */
 407                 if (fepriv->state & FESTATE_RETUNE) {
 408                         s = 0;
 409                 } else {
 410                         if (fe->ops->read_status)
 411                                 fe->ops->read_status(fe, &s);
 412                         if (s != fepriv->status) {
 413                                 dvb_frontend_add_event(fe, s);
 414                                 fepriv->status = s;
 415                         }
 416                 }
 417                 /* if we're not tuned, and we have a lock, move to the TUNED state */
 418                 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 419                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 420                         fepriv->state = FESTATE_TUNED;
 421
 422                         /* if we're tuned, then we have determined the correct inversion */
 423                         if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 424                             (fepriv->parameters.inversion == INVERSION_AUTO)) {
 425                                 fepriv->parameters.inversion = fepriv->inversion;
 426                         }
 427                         continue;
 428                 }
 429
 430                 /* if we are tuned already, check we're still locked */
 431                 if (fepriv->state & FESTATE_TUNED) {
 432                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 433
 434                         /* we're tuned, and the lock is still good... */
 435                         if (s & FE_HAS_LOCK)
 436                                 continue;
 437                         else {
 438                                 /* if we _WERE_ tuned, but now don't have a lock,
 439                                  * need to zigzag */
 440                                 fepriv->state = FESTATE_ZIGZAG_FAST;
 441                                 fepriv->started_auto_step = fepriv->auto_step;
 442                                 check_wrapped = 0;
 443                         }
 444                 }
 445
 446                 /* don't actually do anything if we're in the LOSTLOCK state,
 447                  * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 448                 if ((fepriv->state & FESTATE_LOSTLOCK) &&
 449                     (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 450                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 451                         continue;
 452                 }
 453
 454                 /* don't do anything if we're in the DISEQC state, since this
 455                  * might be someone with a motorized dish controlled by DISEQC.
 456                  * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 457                 if (fepriv->state & FESTATE_DISEQC) {
 458                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 459                         continue;
 460                 }
 461
 462                 /* if we're in the RETUNE state, set everything up for a brand
 463                  * new scan, keeping the current inversion setting, as the next
 464                  * tune is _very_ likely to require the same */
 465                 if (fepriv->state & FESTATE_RETUNE) {
 466                         fepriv->lnb_drift = 0;
 467                         fepriv->auto_step = 0;
 468                         fepriv->auto_sub_step = 0;
 469                         fepriv->started_auto_step = 0;
 470                         check_wrapped = 0;
 471                 }
 472
 473                 /* fast zigzag. */
 474                 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 475                         delay = fepriv->min_delay;
 476
 477                         /* peform a tune */
 478                         if (dvb_frontend_autotune(fe, check_wrapped)) {
 479                                 /* OK, if we've run out of trials at the fast speed.
 480                                  * Drop back to slow for the _next_ attempt */
 481                                 fepriv->state = FESTATE_SEARCHING_SLOW;
 482                                 fepriv->started_auto_step = fepriv->auto_step;
 483                                 continue;
 484                         }
 485                         check_wrapped = 1;
 486
 487                         /* if we've just retuned, enter the ZIGZAG_FAST state.
 488                          * This ensures we cannot return from an
 489                          * FE_SET_FRONTEND ioctl before the first frontend tune
 490                          * occurs */
 491                         if (fepriv->state & FESTATE_RETUNE) {
 492                                 fepriv->state = FESTATE_TUNING_FAST;
 493                         }
 494                 }
 495
 496                 /* slow zigzag */
 497                 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 498                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 499
 500                         /* Note: don't bother checking for wrapping; we stay in this
 501                          * state until we get a lock */
 502                         dvb_frontend_autotune(fe, 0);
 503                 }
 504         }
 505
 506         if (dvb_shutdown_timeout) {
 507                 if (dvb_powerdown_on_sleep)
 508                         if (fe->ops->set_voltage)
 509                                 fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF);
 510                 if (fe->ops->sleep)
 511                         fe->ops->sleep(fe);
 512         }
 513
 514         fepriv->thread_pid = 0;
 515         mb();
 516
 517         dvb_frontend_wakeup(fe);
 518         return 0;
 519 }
 520
 521 static void dvb_frontend_stop(struct dvb_frontend *fe)
 522 {
 523         unsigned long ret;
 524         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 525
 526         dprintk ("%s\n", __FUNCTION__);
 527
 528         fepriv->exit = 1;
 529         mb();
 530
 531         if (!fepriv->thread_pid)
 532                 return;
 533
 534         /* check if the thread is really alive */
 535         if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) {
 536                 printk("dvb_frontend_stop: thread PID %d already died\n",
 537                                 fepriv->thread_pid);
 538                 /* make sure the mutex was not held by the thread */
 539                 init_MUTEX (&fepriv->sem);
 540                 return;
 541         }
 542
 543         /* wake up the frontend thread, so it notices that fe->exit == 1 */
 544         dvb_frontend_wakeup(fe);
 545
 546         /* wait until the frontend thread has exited */
 547         ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid);
 548         if (-ERESTARTSYS != ret) {
 549                 fepriv->state = FESTATE_IDLE;
 550                 return;
 551         }
 552         fepriv->state = FESTATE_IDLE;
 553
 554         /* paranoia check in case a signal arrived */
 555         if (fepriv->thread_pid)
 556                 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
 557                                 fepriv->thread_pid);
 558 }
 559
 560 static int dvb_frontend_start(struct dvb_frontend *fe)
 561 {
 562         int ret;
 563         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 564
 565         dprintk ("%s\n", __FUNCTION__);
 566
 567         if (fepriv->thread_pid) {
 568                 if (!fepriv->exit)
 569                         return 0;
 570                 else
 571                         dvb_frontend_stop (fe);
 572         }
 573
 574         if (signal_pending(current))
 575                 return -EINTR;
 576         if (down_interruptible (&fepriv->sem))
 577                 return -EINTR;
 578
 579         fepriv->state = FESTATE_IDLE;
 580         fepriv->exit = 0;
 581         fepriv->thread_pid = 0;
 582         mb();
 583
 584         ret = kernel_thread (dvb_frontend_thread, fe, 0);
 585
 586         if (ret < 0) {
 587                 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
 588                 up(&fepriv->sem);
 589                 return ret;
 590         }
 591         fepriv->thread_pid = ret;
 592
 593         return 0;
 594 }
 595
 596 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
 597                         unsigned int cmd, void *parg)
 598 {
 599         struct dvb_device *dvbdev = file->private_data;
 600         struct dvb_frontend *fe = dvbdev->priv;
 601         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 602         int err = -EOPNOTSUPP;
 603
 604         dprintk ("%s\n", __FUNCTION__);
 605
 606         if (!fe || fepriv->exit)
 607                 return -ENODEV;
 608
 609         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
 610             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
 611              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
 612                 return -EPERM;
 613
 614         if (down_interruptible (&fepriv->sem))
 615                 return -ERESTARTSYS;
 616
 617         switch (cmd) {
 618         case FE_GET_INFO: {
 619                 struct dvb_frontend_info* info = parg;
 620                 memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info));
 621
 622                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
 623                  * do it, it is done for it. */
 624                 info->caps |= FE_CAN_INVERSION_AUTO;
 625                 err = 0;
 626                 break;
 627         }
 628
 629         case FE_READ_STATUS:
 630                 if (fe->ops->read_status)
 631                         err = fe->ops->read_status(fe, (fe_status_t*) parg);
 632                 break;
 633
 634         case FE_READ_BER:
 635                 if (fe->ops->read_ber)
 636                         err = fe->ops->read_ber(fe, (__u32*) parg);
 637                 break;
 638
 639         case FE_READ_SIGNAL_STRENGTH:
 640                 if (fe->ops->read_signal_strength)
 641                         err = fe->ops->read_signal_strength(fe, (__u16*) parg);
 642                 break;
 643
 644         case FE_READ_SNR:
 645                 if (fe->ops->read_snr)
 646                         err = fe->ops->read_snr(fe, (__u16*) parg);
 647                 break;
 648
 649         case FE_READ_UNCORRECTED_BLOCKS:
 650                 if (fe->ops->read_ucblocks)
 651                         err = fe->ops->read_ucblocks(fe, (__u32*) parg);
 652                 break;
 653
 654
 655         case FE_DISEQC_RESET_OVERLOAD:
 656                 if (fe->ops->diseqc_reset_overload) {
 657                         err = fe->ops->diseqc_reset_overload(fe);
 658                         fepriv->state = FESTATE_DISEQC;
 659                         fepriv->status = 0;
 660                 }
 661                 break;
 662
 663         case FE_DISEQC_SEND_MASTER_CMD:
 664                 if (fe->ops->diseqc_send_master_cmd) {
 665                         err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
 666                         fepriv->state = FESTATE_DISEQC;
 667                         fepriv->status = 0;
 668                 }
 669                 break;
 670
 671         case FE_DISEQC_SEND_BURST:
 672                 if (fe->ops->diseqc_send_burst) {
 673                         err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
 674                         fepriv->state = FESTATE_DISEQC;
 675                         fepriv->status = 0;
 676                 }
 677                 break;
 678
 679         case FE_SET_TONE:
 680                 if (fe->ops->set_tone) {
 681                         err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg);
 682                         fepriv->state = FESTATE_DISEQC;
 683                         fepriv->status = 0;
 684                 }
 685                 break;
 686
 687         case FE_SET_VOLTAGE:
 688                 if (fe->ops->set_voltage) {
 689                         err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg);
 690                         fepriv->state = FESTATE_DISEQC;
 691                         fepriv->status = 0;
 692                 }
 693                 break;
 694
 695         case FE_DISHNETWORK_SEND_LEGACY_CMD:
 696                 if (fe->ops->dishnetwork_send_legacy_command) {
 697                         err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg);
 698                         fepriv->state = FESTATE_DISEQC;
 699                         fepriv->status = 0;
 700                 }
 701                 break;
 702
 703         case FE_DISEQC_RECV_SLAVE_REPLY:
 704                 if (fe->ops->diseqc_recv_slave_reply)
 705                         err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
 706                 break;
 707
 708         case FE_ENABLE_HIGH_LNB_VOLTAGE:
 709                 if (fe->ops->enable_high_lnb_voltage)
 710                         err = fe->ops->enable_high_lnb_voltage(fe, (int) parg);
 711                 break;
 712
 713         case FE_SET_FRONTEND: {
 714                 struct dvb_frontend_tune_settings fetunesettings;
 715
 716                 memcpy (&fepriv->parameters, parg,
 717                         sizeof (struct dvb_frontend_parameters));
 718
 719                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
 720                 memcpy(&fetunesettings.parameters, parg,
 721                        sizeof (struct dvb_frontend_parameters));
 722
 723                 /* force auto frequency inversion if requested */
 724                 if (dvb_force_auto_inversion) {
 725                         fepriv->parameters.inversion = INVERSION_AUTO;
 726                         fetunesettings.parameters.inversion = INVERSION_AUTO;
 727                 }
 728                 if (fe->ops->info.type == FE_OFDM) {
 729                         /* without hierachical coding code_rate_LP is irrelevant,
 730                          * so we tolerate the otherwise invalid FEC_NONE setting */
 731                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
 732                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
 733                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
 734                 }
 735
 736                 /* get frontend-specific tuning settings */
 737                 if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) {
 738                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
 739                         fepriv->max_drift = fetunesettings.max_drift;
 740                         fepriv->step_size = fetunesettings.step_size;
 741                 } else {
 742                         /* default values */
 743                         switch(fe->ops->info.type) {
 744                         case FE_QPSK:
 745                                 fepriv->min_delay = HZ/20;
 746                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
 747                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
 748                                 break;
 749
 750                         case FE_QAM:
 751                                 fepriv->min_delay = HZ/20;
 752                                 fepriv->step_size = 0; /* no zigzag */
 753                                 fepriv->max_drift = 0;
 754                                 break;
 755
 756                         case FE_OFDM:
 757                                 fepriv->min_delay = HZ/20;
 758                                 fepriv->step_size = fe->ops->info.frequency_stepsize * 2;
 759                                 fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1;
 760                                 break;
 761                         case FE_ATSC:
 762                                 printk("dvb-core: FE_ATSC not handled yet.\n");
 763                                 break;
 764                         }
 765                 }
 766                 if (dvb_override_tune_delay > 0)
 767                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
 768
 769                 fepriv->state = FESTATE_RETUNE;
 770                 dvb_frontend_wakeup(fe);
 771                 dvb_frontend_add_event(fe, 0);
 772                 fepriv->status = 0;
 773                 err = 0;
 774                 break;
 775         }
 776
 777         case FE_GET_EVENT:
 778                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
 779                 break;
 780
 781         case FE_GET_FRONTEND:
 782                 if (fe->ops->get_frontend) {
 783                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
 784                         err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg);
 785                 }
 786                 break;
 787         };
 788
 789         up (&fepriv->sem);
 790         return err;
 791 }
 792
 793 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
 794 {
 795         struct dvb_device *dvbdev = file->private_data;
 796         struct dvb_frontend *fe = dvbdev->priv;
 797         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 798
 799         dprintk ("%s\n", __FUNCTION__);
 800
 801         poll_wait (file, &fepriv->events.wait_queue, wait);
 802
 803         if (fepriv->events.eventw != fepriv->events.eventr)
 804                 return (POLLIN | POLLRDNORM | POLLPRI);
 805
 806         return 0;
 807 }
 808
 809 static int dvb_frontend_open(struct inode *inode, struct file *file)
 810 {
 811         struct dvb_device *dvbdev = file->private_data;
 812         struct dvb_frontend *fe = dvbdev->priv;
 813         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 814         int ret;
 815
 816         dprintk ("%s\n", __FUNCTION__);
 817
 818         if ((ret = dvb_generic_open (inode, file)) < 0)
 819                 return ret;
 820
 821         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 822                 ret = dvb_frontend_start (fe);
 823                 if (ret)
 824                         dvb_generic_release (inode, file);
 825
 826                 /*  empty event queue */
 827                 fepriv->events.eventr = fepriv->events.eventw = 0;
 828         }
 829
 830         return ret;
 831 }
 832
 833 static int dvb_frontend_release(struct inode *inode, struct file *file)
 834 {
 835         struct dvb_device *dvbdev = file->private_data;
 836         struct dvb_frontend *fe = dvbdev->priv;
 837         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 838
 839         dprintk ("%s\n", __FUNCTION__);
 840
 841         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
 842                 fepriv->release_jiffies = jiffies;
 843
 844         return dvb_generic_release (inode, file);
 845 }
 846
 847 static struct file_operations dvb_frontend_fops = {
 848         .owner          = THIS_MODULE,
 849         .ioctl          = dvb_generic_ioctl,
 850         .poll           = dvb_frontend_poll,
 851         .open           = dvb_frontend_open,
 852         .release        = dvb_frontend_release
 853 };
 854
 855 int dvb_register_frontend(struct dvb_adapter* dvb,
 856                           struct dvb_frontend* fe)
 857 {
 858         struct dvb_frontend_private *fepriv;
 859         static const struct dvb_device dvbdev_template = {
 860                 .users = ~0,
 861                 .writers = 1,
 862                 .readers = (~0)-1,
 863                 .fops = &dvb_frontend_fops,
 864                 .kernel_ioctl = dvb_frontend_ioctl
 865         };
 866
 867         dprintk ("%s\n", __FUNCTION__);
 868
 869         if (down_interruptible (&frontend_mutex))
 870                 return -ERESTARTSYS;
 871
 872         fe->frontend_priv = kmalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
 873         if (fe->frontend_priv == NULL) {
 874                 up(&frontend_mutex);
 875                 return -ENOMEM;
 876         }
 877         fepriv = fe->frontend_priv;
 878         memset(fe->frontend_priv, 0, sizeof(struct dvb_frontend_private));
 879
 880         init_MUTEX (&fepriv->sem);
 881         init_waitqueue_head (&fepriv->wait_queue);
 882         init_waitqueue_head (&fepriv->events.wait_queue);
 883         init_MUTEX (&fepriv->events.sem);
 884         fe->dvb = dvb;
 885         fepriv->inversion = INVERSION_OFF;
 886
 887         printk ("DVB: registering frontend %i (%s)...\n",
 888                 fe->dvb->num,
 889                 fe->ops->info.name);
 890
 891         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
 892                              fe, DVB_DEVICE_FRONTEND);
 893
 894         up (&frontend_mutex);
 895         return 0;
 896 }
 897 EXPORT_SYMBOL(dvb_register_frontend);
 898
 899 int dvb_unregister_frontend(struct dvb_frontend* fe)
 900 {
 901         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 902         dprintk ("%s\n", __FUNCTION__);
 903
 904         down (&frontend_mutex);
 905         dvb_unregister_device (fepriv->dvbdev);
 906         dvb_frontend_stop (fe);
 907         if (fe->ops->release)
 908                 fe->ops->release(fe);
 909         else
 910                 printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name);
 911         /* fe is invalid now */
 912         kfree(fepriv);
 913         up (&frontend_mutex);
 914         return 0;
 915 }
 916 EXPORT_SYMBOL(dvb_unregister_frontend);