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