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 // #define DEBUG_LOCKLOSS 1
  46
  47 static int dvb_frontend_debug;
  48 static int dvb_shutdown_timeout = 5;
  49 static int dvb_force_auto_inversion;
  50 static int dvb_override_tune_delay;
  51 static int dvb_powerdown_on_sleep = 1;
  52
  53 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  54 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  55 module_param(dvb_shutdown_timeout, int, 0444);
  56 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  57 module_param(dvb_force_auto_inversion, int, 0444);
  58 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  59 module_param(dvb_override_tune_delay, int, 0444);
  60 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  61 module_param(dvb_powerdown_on_sleep, int, 0444);
  62 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)");
  63
  64 #define dprintk if (dvb_frontend_debug) printk
  65
  66 #define FESTATE_IDLE 1
  67 #define FESTATE_RETUNE 2
  68 #define FESTATE_TUNING_FAST 4
  69 #define FESTATE_TUNING_SLOW 8
  70 #define FESTATE_TUNED 16
  71 #define FESTATE_ZIGZAG_FAST 32
  72 #define FESTATE_ZIGZAG_SLOW 64
  73 #define FESTATE_DISEQC 128
  74 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  75 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  76 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  77 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  78 /*
  79  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  80  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  81  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  82  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  83  * FESTATE_TUNED. The frontend has successfully locked on.
  84  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  85  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  86  * FESTATE_DISEQC. A DISEQC command has just been issued.
  87  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  88  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  89  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  90  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  91  */
  92
  93 static DECLARE_MUTEX(frontend_mutex);
  94
  95 struct dvb_frontend_private {
  96
  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         pid_t thread_pid;
 104         unsigned long release_jiffies;
 105         int state;
 106         int bending;
 107         int lnb_drift;
 108         int inversion;
 109         int auto_step;
 110         int auto_sub_step;
 111         int started_auto_step;
 112         int min_delay;
 113         int max_drift;
 114         int step_size;
 115         int exit;
 116         int wakeup;
 117         fe_status_t status;
 118         fe_sec_tone_mode_t tone;
 119 };
 120
 121
 122 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 123 {
 124         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 125         struct dvb_fe_events *events = &fepriv->events;
 126         struct dvb_frontend_event *e;
 127         int wp;
 128
 129         dprintk ("%s\n", __FUNCTION__);
 130
 131         if (down_interruptible (&events->sem))
 132                 return;
 133
 134         wp = (events->eventw + 1) % MAX_EVENT;
 135
 136         if (wp == events->eventr) {
 137                 events->overflow = 1;
 138                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 139         }
 140
 141         e = &events->events[events->eventw];
 142
 143         memcpy (&e->parameters, &fepriv->parameters,
 144                 sizeof (struct dvb_frontend_parameters));
 145
 146         if (status & FE_HAS_LOCK)
 147                 if (fe->ops->get_frontend)
 148                         fe->ops->get_frontend(fe, &e->parameters);
 149
 150         events->eventw = wp;
 151
 152         up (&events->sem);
 153
 154         e->status = status;
 155
 156         wake_up_interruptible (&events->wait_queue);
 157 }
 158
 159 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 160                             struct dvb_frontend_event *event, int flags)
 161 {
 162         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 163         struct dvb_fe_events *events = &fepriv->events;
 164
 165         dprintk ("%s\n", __FUNCTION__);
 166
 167         if (events->overflow) {
 168                 events->overflow = 0;
 169                 return -EOVERFLOW;
 170         }
 171
 172         if (events->eventw == events->eventr) {
 173                 int ret;
 174
 175                 if (flags & O_NONBLOCK)
 176                         return -EWOULDBLOCK;
 177
 178                 up(&fepriv->sem);
 179
 180                 ret = wait_event_interruptible (events->wait_queue,
 181                                                 events->eventw != events->eventr);
 182
 183                 if (down_interruptible (&fepriv->sem))
 184                         return -ERESTARTSYS;
 185
 186                 if (ret < 0)
 187                         return ret;
 188         }
 189
 190         if (down_interruptible (&events->sem))
 191                 return -ERESTARTSYS;
 192
 193         memcpy (event, &events->events[events->eventr],
 194                 sizeof(struct dvb_frontend_event));
 195
 196         events->eventr = (events->eventr + 1) % MAX_EVENT;
 197
 198         up (&events->sem);
 199
 200         return 0;
 201 }
 202
 203 static void dvb_frontend_init(struct dvb_frontend *fe)
 204 {
 205         dprintk ("DVB: initialising frontend %i (%s)...\n",
 206                  fe->dvb->num,
 207                  fe->ops->info.name);
 208
 209         if (fe->ops->init)
 210                 fe->ops->init(fe);
 211 }
 212
 213 static void update_delay(int *quality, int *delay, int min_delay, int locked)
 214 {
 215             int q2;
 216
 217             dprintk ("%s\n", __FUNCTION__);
 218
 219             if (locked)
 220                       (*quality) = (*quality * 220 + 36*256) / 256;
 221             else
 222                       (*quality) = (*quality * 220 + 0) / 256;
 223
 224             q2 = *quality - 128;
 225             q2 *= q2;
 226
 227             *delay = min_delay + q2 * HZ / (128*128);
 228 }
 229
 230 /**
 231  * Performs automatic twiddling of frontend parameters.
 232  *
 233  * @param fe The frontend concerned.
 234  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 235  * @returns Number of complete iterations that have been performed.
 236  */
 237 static int dvb_frontend_autotune(struct dvb_frontend *fe, int check_wrapped)
 238 {
 239         int autoinversion;
 240         int ready = 0;
 241         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 242         int original_inversion = fepriv->parameters.inversion;
 243         u32 original_frequency = fepriv->parameters.frequency;
 244
 245         /* are we using autoinversion? */
 246         autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 247                          (fepriv->parameters.inversion == INVERSION_AUTO));
 248
 249         /* setup parameters correctly */
 250         while(!ready) {
 251                 /* calculate the lnb_drift */
 252                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 253
 254                 /* wrap the auto_step if we've exceeded the maximum drift */
 255                 if (fepriv->lnb_drift > fepriv->max_drift) {
 256                         fepriv->auto_step = 0;
 257                         fepriv->auto_sub_step = 0;
 258                         fepriv->lnb_drift = 0;
 259                 }
 260
 261                 /* perform inversion and +/- zigzag */
 262                 switch(fepriv->auto_sub_step) {
 263                 case 0:
 264                         /* try with the current inversion and current drift setting */
 265                         ready = 1;
 266                         break;
 267
 268                 case 1:
 269                         if (!autoinversion) break;
 270
 271                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 272                         ready = 1;
 273                         break;
 274
 275                 case 2:
 276                         if (fepriv->lnb_drift == 0) break;
 277
 278                         fepriv->lnb_drift = -fepriv->lnb_drift;
 279                         ready = 1;
 280                         break;
 281
 282                 case 3:
 283                         if (fepriv->lnb_drift == 0) break;
 284                         if (!autoinversion) break;
 285
 286                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 287                         fepriv->lnb_drift = -fepriv->lnb_drift;
 288                         ready = 1;
 289                         break;
 290
 291                 default:
 292                         fepriv->auto_step++;
 293                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 294                         break;
 295                 }
 296
 297                 if (!ready) fepriv->auto_sub_step++;
 298         }
 299
 300         /* if this attempt would hit where we started, indicate a complete
 301          * iteration has occurred */
 302         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 303             (fepriv->auto_sub_step == 0) && check_wrapped) {
 304                 return 1;
 305         }
 306
 307         dprintk("%s: drift:%i inversion:%i auto_step:%i "
 308                 "auto_sub_step:%i started_auto_step:%i\n",
 309                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
 310                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
 311
 312         /* set the frontend itself */
 313         fepriv->parameters.frequency += fepriv->lnb_drift;
 314         if (autoinversion)
 315                 fepriv->parameters.inversion = fepriv->inversion;
 316         if (fe->ops->set_frontend)
 317                 fe->ops->set_frontend(fe, &fepriv->parameters);
 318
 319         fepriv->parameters.frequency = original_frequency;
 320         fepriv->parameters.inversion = original_inversion;
 321
 322         fepriv->auto_sub_step++;
 323         return 0;
 324 }
 325
 326 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 327 {
 328         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 329
 330         if (fepriv->exit)
 331                 return 1;
 332
 333         if (fepriv->dvbdev->writers == 1)
 334                 if (time_after(jiffies, fepriv->release_jiffies +
 335                                         dvb_shutdown_timeout * HZ))
 336                         return 1;
 337
 338         return 0;
 339 }
 340
 341 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 342 {
 343         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 344
 345         if (fepriv->wakeup) {
 346                 fepriv->wakeup = 0;
 347                 return 1;
 348         }
 349         return dvb_frontend_is_exiting(fe);
 350 }
 351
 352 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 353 {
 354         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 355
 356         fepriv->wakeup = 1;
 357         wake_up_interruptible(&fepriv->wait_queue);
 358 }
 359
 360 /*
 361  * FIXME: use linux/kthread.h
 362  */
 363 static int dvb_frontend_thread(void *data)
 364 {
 365         struct dvb_frontend *fe = data;
 366         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 367         unsigned long timeout;
 368         char name [15];
 369         int quality = 0, delay = 3*HZ;
 370         fe_status_t s;
 371         int check_wrapped = 0;
 372
 373         dprintk("%s\n", __FUNCTION__);
 374
 375         snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num);
 376
 377         lock_kernel();
 378         daemonize(name);
 379         sigfillset(&current->blocked);
 380         unlock_kernel();
 381
 382         fepriv->status = 0;
 383         dvb_frontend_init(fe);
 384         fepriv->wakeup = 0;
 385
 386         while (1) {
 387                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 388
 389                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
 390                                                            dvb_frontend_should_wakeup(fe),
 391                                                            delay);
 392                 if (0 != dvb_frontend_is_exiting(fe)) {
 393                         /* got signal or quitting */
 394                         break;
 395                 }
 396
 397                 try_to_freeze();
 398
 399                 if (down_interruptible(&fepriv->sem))
 400                         break;
 401
 402                 /* if we've got no parameters, just keep idling */
 403                 if (fepriv->state & FESTATE_IDLE) {
 404                         delay = 3*HZ;
 405                         quality = 0;
 406                         continue;
 407                 }
 408
 409                 /* get the frontend status */
 410                 if (fepriv->state & FESTATE_RETUNE) {
 411                         s = 0;
 412                 } else {
 413                         if (fe->ops->read_status)
 414                                 fe->ops->read_status(fe, &s);
 415                         if (s != fepriv->status) {
 416                                 dvb_frontend_add_event(fe, s);
 417                                 fepriv->status = s;
 418                         }
 419                 }
 420                 /* if we're not tuned, and we have a lock, move to the TUNED state */
 421                 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 422                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 423                         fepriv->state = FESTATE_TUNED;
 424
 425                         /* if we're tuned, then we have determined the correct inversion */
 426                         if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 427                             (fepriv->parameters.inversion == INVERSION_AUTO)) {
 428                                 fepriv->parameters.inversion = fepriv->inversion;
 429                         }
 430                         continue;
 431                 }
 432
 433                 /* if we are tuned already, check we're still locked */
 434                 if (fepriv->state & FESTATE_TUNED) {
 435                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 436
 437                         /* we're tuned, and the lock is still good... */
 438                         if (s & FE_HAS_LOCK)
 439                                 continue;
 440                         else { /* if we _WERE_ tuned, but now don't have a lock */
 441 #ifdef DEBUG_LOCKLOSS
 442                                 /* first of all try setting the tone again if it was on - this
 443                                  * sometimes works around problems with noisy power supplies */
 444                                 if (fe->ops->set_tone && (fepriv->tone == SEC_TONE_ON)) {
 445                                         fe->ops->set_tone(fe, fepriv->tone);
 446                                         mdelay(100);
 447                                         s = 0;
 448                                         fe->ops->read_status(fe, &s);
 449                                         if (s & FE_HAS_LOCK) {
 450                                                 printk("DVB%i: Lock was lost, but regained by setting "
 451                                                        "the tone. This may indicate your power supply "
 452                                                        "is noisy/slightly incompatable with this DVB-S "
 453                                                        "adapter\n", fe->dvb->num);
 454                                                 fepriv->state = FESTATE_TUNED;
 455                                                 continue;
 456                                         }
 457                                 }
 458 #endif
 459                                 /* some other reason for losing the lock - start zigzagging */
 460                                 fepriv->state = FESTATE_ZIGZAG_FAST;
 461                                 fepriv->started_auto_step = fepriv->auto_step;
 462                                 check_wrapped = 0;
 463                         }
 464                 }
 465
 466                 /* don't actually do anything if we're in the LOSTLOCK state,
 467                  * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 468                 if ((fepriv->state & FESTATE_LOSTLOCK) &&
 469                     (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 470                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 471                         continue;
 472                 }
 473
 474                 /* don't do anything if we're in the DISEQC state, since this
 475                  * might be someone with a motorized dish controlled by DISEQC.
 476                  * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 477                 if (fepriv->state & FESTATE_DISEQC) {
 478                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 479                         continue;
 480                 }
 481
 482                 /* if we're in the RETUNE state, set everything up for a brand
 483                  * new scan, keeping the current inversion setting, as the next
 484                  * tune is _very_ likely to require the same */
 485                 if (fepriv->state & FESTATE_RETUNE) {
 486                         fepriv->lnb_drift = 0;
 487                         fepriv->auto_step = 0;
 488                         fepriv->auto_sub_step = 0;
 489                         fepriv->started_auto_step = 0;
 490                         check_wrapped = 0;
 491                 }
 492
 493                 /* fast zigzag. */
 494                 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 495                         delay = fepriv->min_delay;
 496
 497                         /* peform a tune */
 498                         if (dvb_frontend_autotune(fe, check_wrapped)) {
 499                                 /* OK, if we've run out of trials at the fast speed.
 500                                  * Drop back to slow for the _next_ attempt */
 501                                 fepriv->state = FESTATE_SEARCHING_SLOW;
 502                                 fepriv->started_auto_step = fepriv->auto_step;
 503                                 continue;
 504                         }
 505                         check_wrapped = 1;
 506
 507                         /* if we've just retuned, enter the ZIGZAG_FAST state.
 508                          * This ensures we cannot return from an
 509                          * FE_SET_FRONTEND ioctl before the first frontend tune
 510                          * occurs */
 511                         if (fepriv->state & FESTATE_RETUNE) {
 512                                 fepriv->state = FESTATE_TUNING_FAST;
 513                         }
 514                 }
 515
 516                 /* slow zigzag */
 517                 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 518                         update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK);
 519
 520                         /* Note: don't bother checking for wrapping; we stay in this
 521                          * state until we get a lock */
 522                         dvb_frontend_autotune(fe, 0);
 523                 }
 524         }
 525
 526         if (dvb_shutdown_timeout) {
 527                 if (dvb_powerdown_on_sleep)
 528                         if (fe->ops->set_voltage)
 529                                 fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF);
 530                 if (fe->ops->sleep)
 531                         fe->ops->sleep(fe);
 532         }
 533
 534         fepriv->thread_pid = 0;
 535         mb();
 536
 537         dvb_frontend_wakeup(fe);
 538         return 0;
 539 }
 540
 541 static void dvb_frontend_stop(struct dvb_frontend *fe)
 542 {
 543         unsigned long ret;
 544         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 545
 546         dprintk ("%s\n", __FUNCTION__);
 547
 548         fepriv->exit = 1;
 549         mb();
 550
 551         if (!fepriv->thread_pid)
 552                 return;
 553
 554         /* check if the thread is really alive */
 555         if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) {
 556                 printk("dvb_frontend_stop: thread PID %d already died\n",
 557                                 fepriv->thread_pid);
 558                 /* make sure the mutex was not held by the thread */
 559                 init_MUTEX (&fepriv->sem);
 560                 return;
 561         }
 562
 563         /* wake up the frontend thread, so it notices that fe->exit == 1 */
 564         dvb_frontend_wakeup(fe);
 565
 566         /* wait until the frontend thread has exited */
 567         ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid);
 568         if (-ERESTARTSYS != ret) {
 569                 fepriv->state = FESTATE_IDLE;
 570                 return;
 571         }
 572         fepriv->state = FESTATE_IDLE;
 573
 574         /* paranoia check in case a signal arrived */
 575         if (fepriv->thread_pid)
 576                 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
 577                                 fepriv->thread_pid);
 578 }
 579
 580 static int dvb_frontend_start(struct dvb_frontend *fe)
 581 {
 582         int ret;
 583         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 584
 585         dprintk ("%s\n", __FUNCTION__);
 586
 587         if (fepriv->thread_pid) {
 588                 if (!fepriv->exit)
 589                         return 0;
 590                 else
 591                         dvb_frontend_stop (fe);
 592         }
 593
 594         if (signal_pending(current))
 595                 return -EINTR;
 596         if (down_interruptible (&fepriv->sem))
 597                 return -EINTR;
 598
 599         fepriv->state = FESTATE_IDLE;
 600         fepriv->exit = 0;
 601         fepriv->thread_pid = 0;
 602         mb();
 603
 604         ret = kernel_thread (dvb_frontend_thread, fe, 0);
 605
 606         if (ret < 0) {
 607                 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
 608                 up(&fepriv->sem);
 609                 return ret;
 610         }
 611         fepriv->thread_pid = ret;
 612
 613         return 0;
 614 }
 615
 616 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
 617                         unsigned int cmd, void *parg)
 618 {
 619         struct dvb_device *dvbdev = file->private_data;
 620         struct dvb_frontend *fe = dvbdev->priv;
 621         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 622         int err = -EOPNOTSUPP;
 623
 624         dprintk ("%s\n", __FUNCTION__);
 625
 626         if (!fe || fepriv->exit)
 627                 return -ENODEV;
 628
 629         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
 630             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
 631              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
 632                 return -EPERM;
 633
 634         if (down_interruptible (&fepriv->sem))
 635                 return -ERESTARTSYS;
 636
 637         switch (cmd) {
 638         case FE_GET_INFO: {
 639                 struct dvb_frontend_info* info = parg;
 640                 memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info));
 641
 642                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
 643                  * do it, it is done for it. */
 644                 info->caps |= FE_CAN_INVERSION_AUTO;
 645                 err = 0;
 646                 break;
 647         }
 648
 649         case FE_READ_STATUS: {
 650                 fe_status_t* status = parg;
 651
 652                 /* if retune was requested but hasn't occured yet, prevent
 653                  * that user get signal state from previous tuning */
 654                 if(fepriv->state == FESTATE_RETUNE) {
 655                         err=0;
 656                         *status = 0;
 657                         break;
 658                 }
 659
 660                 if (fe->ops->read_status)
 661                         err = fe->ops->read_status(fe, status);
 662                 break;
 663         }
 664         case FE_READ_BER:
 665                 if (fe->ops->read_ber)
 666                         err = fe->ops->read_ber(fe, (__u32*) parg);
 667                 break;
 668
 669         case FE_READ_SIGNAL_STRENGTH:
 670                 if (fe->ops->read_signal_strength)
 671                         err = fe->ops->read_signal_strength(fe, (__u16*) parg);
 672                 break;
 673
 674         case FE_READ_SNR:
 675                 if (fe->ops->read_snr)
 676                         err = fe->ops->read_snr(fe, (__u16*) parg);
 677                 break;
 678
 679         case FE_READ_UNCORRECTED_BLOCKS:
 680                 if (fe->ops->read_ucblocks)
 681                         err = fe->ops->read_ucblocks(fe, (__u32*) parg);
 682                 break;
 683
 684
 685         case FE_DISEQC_RESET_OVERLOAD:
 686                 if (fe->ops->diseqc_reset_overload) {
 687                         err = fe->ops->diseqc_reset_overload(fe);
 688                         fepriv->state = FESTATE_DISEQC;
 689                         fepriv->status = 0;
 690                 }
 691                 break;
 692
 693         case FE_DISEQC_SEND_MASTER_CMD:
 694                 if (fe->ops->diseqc_send_master_cmd) {
 695                         err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
 696                         fepriv->state = FESTATE_DISEQC;
 697                         fepriv->status = 0;
 698                 }
 699                 break;
 700
 701         case FE_DISEQC_SEND_BURST:
 702                 if (fe->ops->diseqc_send_burst) {
 703                         err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
 704                         fepriv->state = FESTATE_DISEQC;
 705                         fepriv->status = 0;
 706                 }
 707                 break;
 708
 709         case FE_SET_TONE:
 710                 if (fe->ops->set_tone) {
 711                         err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg);
 712                         fepriv->state = FESTATE_DISEQC;
 713                         fepriv->status = 0;
 714                         fepriv->tone = (fe_sec_tone_mode_t) parg;
 715                 }
 716                 break;
 717
 718         case FE_SET_VOLTAGE:
 719                 if (fe->ops->set_voltage) {
 720                         err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg);
 721                         fepriv->state = FESTATE_DISEQC;
 722                         fepriv->status = 0;
 723                 }
 724                 break;
 725
 726         case FE_DISHNETWORK_SEND_LEGACY_CMD:
 727                 if (fe->ops->dishnetwork_send_legacy_command) {
 728                         err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg);
 729                         fepriv->state = FESTATE_DISEQC;
 730                         fepriv->status = 0;
 731                 }
 732                 break;
 733
 734         case FE_DISEQC_RECV_SLAVE_REPLY:
 735                 if (fe->ops->diseqc_recv_slave_reply)
 736                         err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
 737                 break;
 738
 739         case FE_ENABLE_HIGH_LNB_VOLTAGE:
 740                 if (fe->ops->enable_high_lnb_voltage)
 741                         err = fe->ops->enable_high_lnb_voltage(fe, (int) parg);
 742                 break;
 743
 744         case FE_SET_FRONTEND: {
 745                 struct dvb_frontend_tune_settings fetunesettings;
 746
 747                 memcpy (&fepriv->parameters, parg,
 748                         sizeof (struct dvb_frontend_parameters));
 749
 750                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
 751                 memcpy(&fetunesettings.parameters, parg,
 752                        sizeof (struct dvb_frontend_parameters));
 753
 754                 /* force auto frequency inversion if requested */
 755                 if (dvb_force_auto_inversion) {
 756                         fepriv->parameters.inversion = INVERSION_AUTO;
 757                         fetunesettings.parameters.inversion = INVERSION_AUTO;
 758                 }
 759                 if (fe->ops->info.type == FE_OFDM) {
 760                         /* without hierachical coding code_rate_LP is irrelevant,
 761                          * so we tolerate the otherwise invalid FEC_NONE setting */
 762                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
 763                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
 764                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
 765                 }
 766
 767                 /* get frontend-specific tuning settings */
 768                 if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) {
 769                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
 770                         fepriv->max_drift = fetunesettings.max_drift;
 771                         fepriv->step_size = fetunesettings.step_size;
 772                 } else {
 773                         /* default values */
 774                         switch(fe->ops->info.type) {
 775                         case FE_QPSK:
 776                                 fepriv->min_delay = HZ/20;
 777                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
 778                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
 779                                 break;
 780
 781                         case FE_QAM:
 782                                 fepriv->min_delay = HZ/20;
 783                                 fepriv->step_size = 0; /* no zigzag */
 784                                 fepriv->max_drift = 0;
 785                                 break;
 786
 787                         case FE_OFDM:
 788                                 fepriv->min_delay = HZ/20;
 789                                 fepriv->step_size = fe->ops->info.frequency_stepsize * 2;
 790                                 fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1;
 791                                 break;
 792                         case FE_ATSC:
 793                                 printk("dvb-core: FE_ATSC not handled yet.\n");
 794                                 break;
 795                         }
 796                 }
 797                 if (dvb_override_tune_delay > 0)
 798                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
 799
 800                 fepriv->state = FESTATE_RETUNE;
 801                 dvb_frontend_wakeup(fe);
 802                 dvb_frontend_add_event(fe, 0);
 803                 fepriv->status = 0;
 804                 err = 0;
 805                 break;
 806         }
 807
 808         case FE_GET_EVENT:
 809                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
 810                 break;
 811
 812         case FE_GET_FRONTEND:
 813                 if (fe->ops->get_frontend) {
 814                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
 815                         err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg);
 816                 }
 817                 break;
 818         };
 819
 820         up (&fepriv->sem);
 821         return err;
 822 }
 823
 824 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
 825 {
 826         struct dvb_device *dvbdev = file->private_data;
 827         struct dvb_frontend *fe = dvbdev->priv;
 828         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 829
 830         dprintk ("%s\n", __FUNCTION__);
 831
 832         poll_wait (file, &fepriv->events.wait_queue, wait);
 833
 834         if (fepriv->events.eventw != fepriv->events.eventr)
 835                 return (POLLIN | POLLRDNORM | POLLPRI);
 836
 837         return 0;
 838 }
 839
 840 static int dvb_frontend_open(struct inode *inode, struct file *file)
 841 {
 842         struct dvb_device *dvbdev = file->private_data;
 843         struct dvb_frontend *fe = dvbdev->priv;
 844         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 845         int ret;
 846
 847         dprintk ("%s\n", __FUNCTION__);
 848
 849         if ((ret = dvb_generic_open (inode, file)) < 0)
 850                 return ret;
 851
 852         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 853                 ret = dvb_frontend_start (fe);
 854                 if (ret)
 855                         dvb_generic_release (inode, file);
 856
 857                 /*  empty event queue */
 858                 fepriv->events.eventr = fepriv->events.eventw = 0;
 859         }
 860
 861         return ret;
 862 }
 863
 864 static int dvb_frontend_release(struct inode *inode, struct file *file)
 865 {
 866         struct dvb_device *dvbdev = file->private_data;
 867         struct dvb_frontend *fe = dvbdev->priv;
 868         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 869
 870         dprintk ("%s\n", __FUNCTION__);
 871
 872         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
 873                 fepriv->release_jiffies = jiffies;
 874
 875         return dvb_generic_release (inode, file);
 876 }
 877
 878 static struct file_operations dvb_frontend_fops = {
 879         .owner          = THIS_MODULE,
 880         .ioctl          = dvb_generic_ioctl,
 881         .poll           = dvb_frontend_poll,
 882         .open           = dvb_frontend_open,
 883         .release        = dvb_frontend_release
 884 };
 885
 886 int dvb_register_frontend(struct dvb_adapter* dvb,
 887                           struct dvb_frontend* fe)
 888 {
 889         struct dvb_frontend_private *fepriv;
 890         static const struct dvb_device dvbdev_template = {
 891                 .users = ~0,
 892                 .writers = 1,
 893                 .readers = (~0)-1,
 894                 .fops = &dvb_frontend_fops,
 895                 .kernel_ioctl = dvb_frontend_ioctl
 896         };
 897
 898         dprintk ("%s\n", __FUNCTION__);
 899
 900         if (down_interruptible (&frontend_mutex))
 901                 return -ERESTARTSYS;
 902
 903         fe->frontend_priv = kmalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
 904         if (fe->frontend_priv == NULL) {
 905                 up(&frontend_mutex);
 906                 return -ENOMEM;
 907         }
 908         fepriv = fe->frontend_priv;
 909         memset(fe->frontend_priv, 0, sizeof(struct dvb_frontend_private));
 910
 911         init_MUTEX (&fepriv->sem);
 912         init_waitqueue_head (&fepriv->wait_queue);
 913         init_waitqueue_head (&fepriv->events.wait_queue);
 914         init_MUTEX (&fepriv->events.sem);
 915         fe->dvb = dvb;
 916         fepriv->inversion = INVERSION_OFF;
 917         fepriv->tone = SEC_TONE_OFF;
 918
 919         printk ("DVB: registering frontend %i (%s)...\n",
 920                 fe->dvb->num,
 921                 fe->ops->info.name);
 922
 923         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
 924                              fe, DVB_DEVICE_FRONTEND);
 925
 926         up (&frontend_mutex);
 927         return 0;
 928 }
 929 EXPORT_SYMBOL(dvb_register_frontend);
 930
 931 int dvb_unregister_frontend(struct dvb_frontend* fe)
 932 {
 933         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 934         dprintk ("%s\n", __FUNCTION__);
 935
 936         down (&frontend_mutex);
 937         dvb_unregister_device (fepriv->dvbdev);
 938         dvb_frontend_stop (fe);
 939         if (fe->ops->release)
 940                 fe->ops->release(fe);
 941         else
 942                 printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name);
 943         /* fe is invalid now */
 944         kfree(fepriv);
 945         up (&frontend_mutex);
 946         return 0;
 947 }
 948 EXPORT_SYMBOL(dvb_unregister_frontend);