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         int tone;
 110         int voltage;
 111
 112         /* swzigzag values */
 113         unsigned int state;
 114         unsigned int bending;
 115         int lnb_drift;
 116         unsigned int inversion;
 117         unsigned int auto_step;
 118         unsigned int auto_sub_step;
 119         unsigned int started_auto_step;
 120         unsigned int min_delay;
 121         unsigned int max_drift;
 122         unsigned int step_size;
 123         int quality;
 124         unsigned int check_wrapped;
 125 };
 126
 127 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 128
 129 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 130 {
 131         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 132         struct dvb_fe_events *events = &fepriv->events;
 133         struct dvb_frontend_event *e;
 134         int wp;
 135
 136         dprintk ("%s\n", __FUNCTION__);
 137
 138         if (down_interruptible (&events->sem))
 139                 return;
 140
 141         wp = (events->eventw + 1) % MAX_EVENT;
 142
 143         if (wp == events->eventr) {
 144                 events->overflow = 1;
 145                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 146         }
 147
 148         e = &events->events[events->eventw];
 149
 150         memcpy (&e->parameters, &fepriv->parameters,
 151                 sizeof (struct dvb_frontend_parameters));
 152
 153         if (status & FE_HAS_LOCK)
 154                 if (fe->ops->get_frontend)
 155                         fe->ops->get_frontend(fe, &e->parameters);
 156
 157         events->eventw = wp;
 158
 159         up (&events->sem);
 160
 161         e->status = status;
 162
 163         wake_up_interruptible (&events->wait_queue);
 164 }
 165
 166 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 167                             struct dvb_frontend_event *event, int flags)
 168 {
 169         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 170         struct dvb_fe_events *events = &fepriv->events;
 171
 172         dprintk ("%s\n", __FUNCTION__);
 173
 174         if (events->overflow) {
 175                 events->overflow = 0;
 176                 return -EOVERFLOW;
 177         }
 178
 179         if (events->eventw == events->eventr) {
 180                 int ret;
 181
 182                 if (flags & O_NONBLOCK)
 183                         return -EWOULDBLOCK;
 184
 185                 up(&fepriv->sem);
 186
 187                 ret = wait_event_interruptible (events->wait_queue,
 188                                                 events->eventw != events->eventr);
 189
 190                 if (down_interruptible (&fepriv->sem))
 191                         return -ERESTARTSYS;
 192
 193                 if (ret < 0)
 194                         return ret;
 195         }
 196
 197         if (down_interruptible (&events->sem))
 198                 return -ERESTARTSYS;
 199
 200         memcpy (event, &events->events[events->eventr],
 201                 sizeof(struct dvb_frontend_event));
 202
 203         events->eventr = (events->eventr + 1) % MAX_EVENT;
 204
 205         up (&events->sem);
 206
 207         return 0;
 208 }
 209
 210 static void dvb_frontend_init(struct dvb_frontend *fe)
 211 {
 212         dprintk ("DVB: initialising frontend %i (%s)...\n",
 213                  fe->dvb->num,
 214                  fe->ops->info.name);
 215
 216         if (fe->ops->init)
 217                 fe->ops->init(fe);
 218 }
 219
 220 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 221 {
 222         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 223
 224         fepriv->reinitialise = 1;
 225         dvb_frontend_wakeup(fe);
 226 }
 227 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 228
 229 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 230 {
 231         int q2;
 232
 233         dprintk ("%s\n", __FUNCTION__);
 234
 235         if (locked)
 236                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 237         else
 238                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 239
 240         q2 = fepriv->quality - 128;
 241         q2 *= q2;
 242
 243         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 244 }
 245
 246 /**
 247  * Performs automatic twiddling of frontend parameters.
 248  *
 249  * @param fe The frontend concerned.
 250  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 251  * @returns Number of complete iterations that have been performed.
 252  */
 253 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 254 {
 255         int autoinversion;
 256         int ready = 0;
 257         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 258         int original_inversion = fepriv->parameters.inversion;
 259         u32 original_frequency = fepriv->parameters.frequency;
 260
 261         /* are we using autoinversion? */
 262         autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 263                          (fepriv->parameters.inversion == INVERSION_AUTO));
 264
 265         /* setup parameters correctly */
 266         while(!ready) {
 267                 /* calculate the lnb_drift */
 268                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 269
 270                 /* wrap the auto_step if we've exceeded the maximum drift */
 271                 if (fepriv->lnb_drift > fepriv->max_drift) {
 272                         fepriv->auto_step = 0;
 273                         fepriv->auto_sub_step = 0;
 274                         fepriv->lnb_drift = 0;
 275                 }
 276
 277                 /* perform inversion and +/- zigzag */
 278                 switch(fepriv->auto_sub_step) {
 279                 case 0:
 280                         /* try with the current inversion and current drift setting */
 281                         ready = 1;
 282                         break;
 283
 284                 case 1:
 285                         if (!autoinversion) break;
 286
 287                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 288                         ready = 1;
 289                         break;
 290
 291                 case 2:
 292                         if (fepriv->lnb_drift == 0) break;
 293
 294                         fepriv->lnb_drift = -fepriv->lnb_drift;
 295                         ready = 1;
 296                         break;
 297
 298                 case 3:
 299                         if (fepriv->lnb_drift == 0) break;
 300                         if (!autoinversion) break;
 301
 302                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 303                         fepriv->lnb_drift = -fepriv->lnb_drift;
 304                         ready = 1;
 305                         break;
 306
 307                 default:
 308                         fepriv->auto_step++;
 309                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 310                         break;
 311                 }
 312
 313                 if (!ready) fepriv->auto_sub_step++;
 314         }
 315
 316         /* if this attempt would hit where we started, indicate a complete
 317          * iteration has occurred */
 318         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 319             (fepriv->auto_sub_step == 0) && check_wrapped) {
 320                 return 1;
 321         }
 322
 323         dprintk("%s: drift:%i inversion:%i auto_step:%i "
 324                 "auto_sub_step:%i started_auto_step:%i\n",
 325                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
 326                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
 327
 328         /* set the frontend itself */
 329         fepriv->parameters.frequency += fepriv->lnb_drift;
 330         if (autoinversion)
 331                 fepriv->parameters.inversion = fepriv->inversion;
 332         if (fe->ops->set_frontend)
 333                 fe->ops->set_frontend(fe, &fepriv->parameters);
 334
 335         fepriv->parameters.frequency = original_frequency;
 336         fepriv->parameters.inversion = original_inversion;
 337
 338         fepriv->auto_sub_step++;
 339         return 0;
 340 }
 341
 342 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 343 {
 344         fe_status_t s;
 345         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 346
 347         /* if we've got no parameters, just keep idling */
 348         if (fepriv->state & FESTATE_IDLE) {
 349                 fepriv->delay = 3*HZ;
 350                 fepriv->quality = 0;
 351                 return;
 352         }
 353
 354         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 355         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 356                 if (fepriv->state & FESTATE_RETUNE) {
 357                         if (fe->ops->set_frontend)
 358                                 fe->ops->set_frontend(fe, &fepriv->parameters);
 359                         fepriv->state = FESTATE_TUNED;
 360                 }
 361                 fepriv->delay = 3*HZ;
 362                 fepriv->quality = 0;
 363                 return;
 364         }
 365
 366         /* get the frontend status */
 367         if (fepriv->state & FESTATE_RETUNE) {
 368                 s = 0;
 369         } else {
 370                 if (fe->ops->read_status)
 371                         fe->ops->read_status(fe, &s);
 372                 if (s != fepriv->status) {
 373                         dvb_frontend_add_event(fe, s);
 374                         fepriv->status = s;
 375                 }
 376         }
 377
 378         /* if we're not tuned, and we have a lock, move to the TUNED state */
 379         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 380                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 381                 fepriv->state = FESTATE_TUNED;
 382
 383                 /* if we're tuned, then we have determined the correct inversion */
 384                 if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
 385                     (fepriv->parameters.inversion == INVERSION_AUTO)) {
 386                         fepriv->parameters.inversion = fepriv->inversion;
 387                 }
 388                 return;
 389         }
 390
 391         /* if we are tuned already, check we're still locked */
 392         if (fepriv->state & FESTATE_TUNED) {
 393                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 394
 395                 /* we're tuned, and the lock is still good... */
 396                 if (s & FE_HAS_LOCK) {
 397                         return;
 398                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 399                         fepriv->state = FESTATE_ZIGZAG_FAST;
 400                         fepriv->started_auto_step = fepriv->auto_step;
 401                         fepriv->check_wrapped = 0;
 402                 }
 403         }
 404
 405         /* don't actually do anything if we're in the LOSTLOCK state,
 406          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 407         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 408             (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 409                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 410                 return;
 411         }
 412
 413         /* don't do anything if we're in the DISEQC state, since this
 414          * might be someone with a motorized dish controlled by DISEQC.
 415          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 416         if (fepriv->state & FESTATE_DISEQC) {
 417                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 418                 return;
 419         }
 420
 421         /* if we're in the RETUNE state, set everything up for a brand
 422          * new scan, keeping the current inversion setting, as the next
 423          * tune is _very_ likely to require the same */
 424         if (fepriv->state & FESTATE_RETUNE) {
 425                 fepriv->lnb_drift = 0;
 426                 fepriv->auto_step = 0;
 427                 fepriv->auto_sub_step = 0;
 428                 fepriv->started_auto_step = 0;
 429                 fepriv->check_wrapped = 0;
 430         }
 431
 432         /* fast zigzag. */
 433         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 434                 fepriv->delay = fepriv->min_delay;
 435
 436                 /* peform a tune */
 437                 if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
 438                         /* OK, if we've run out of trials at the fast speed.
 439                          * Drop back to slow for the _next_ attempt */
 440                         fepriv->state = FESTATE_SEARCHING_SLOW;
 441                         fepriv->started_auto_step = fepriv->auto_step;
 442                         return;
 443                 }
 444                 fepriv->check_wrapped = 1;
 445
 446                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 447                  * This ensures we cannot return from an
 448                  * FE_SET_FRONTEND ioctl before the first frontend tune
 449                  * occurs */
 450                 if (fepriv->state & FESTATE_RETUNE) {
 451                         fepriv->state = FESTATE_TUNING_FAST;
 452                 }
 453         }
 454
 455         /* slow zigzag */
 456         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 457                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 458
 459                 /* Note: don't bother checking for wrapping; we stay in this
 460                  * state until we get a lock */
 461                 dvb_frontend_swzigzag_autotune(fe, 0);
 462         }
 463 }
 464
 465 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 466 {
 467         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 468
 469         if (fepriv->exit)
 470                 return 1;
 471
 472         if (fepriv->dvbdev->writers == 1)
 473                 if (time_after(jiffies, fepriv->release_jiffies +
 474                                   dvb_shutdown_timeout * HZ))
 475                         return 1;
 476
 477         return 0;
 478 }
 479
 480 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 481 {
 482         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 483
 484         if (fepriv->wakeup) {
 485                 fepriv->wakeup = 0;
 486                 return 1;
 487         }
 488         return dvb_frontend_is_exiting(fe);
 489 }
 490
 491 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 492 {
 493         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 494
 495         fepriv->wakeup = 1;
 496         wake_up_interruptible(&fepriv->wait_queue);
 497 }
 498
 499 static int dvb_frontend_thread(void *data)
 500 {
 501         struct dvb_frontend *fe = data;
 502         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 503         unsigned long timeout;
 504         char name [15];
 505         fe_status_t s;
 506         struct dvb_frontend_parameters *params;
 507
 508         dprintk("%s\n", __FUNCTION__);
 509
 510         snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num);
 511
 512         lock_kernel();
 513         daemonize(name);
 514         sigfillset(&current->blocked);
 515         unlock_kernel();
 516
 517         fepriv->check_wrapped = 0;
 518         fepriv->quality = 0;
 519         fepriv->delay = 3*HZ;
 520         fepriv->status = 0;
 521         fepriv->wakeup = 0;
 522         fepriv->reinitialise = 1;
 523
 524         while (1) {
 525                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 526
 527                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
 528                                                            dvb_frontend_should_wakeup(fe),
 529                                                            fepriv->delay);
 530                 if (0 != dvb_frontend_is_exiting(fe)) {
 531                         /* got signal or quitting */
 532                         break;
 533                 }
 534
 535                 try_to_freeze();
 536
 537                 if (down_interruptible(&fepriv->sem))
 538                         break;
 539
 540                 if (fepriv->reinitialise) {
 541                         dvb_frontend_init(fe);
 542                         if (fepriv->tone != -1) {
 543                                 fe->ops->set_tone(fe, fepriv->tone);
 544                         }
 545                         if (fepriv->voltage != -1) {
 546                                 fe->ops->set_voltage(fe, fepriv->voltage);
 547                         }
 548                         fepriv->reinitialise = 0;
 549                 }
 550
 551                 /* do an iteration of the tuning loop */
 552                 if (fe->ops->tune) {
 553                         /* have we been asked to retune? */
 554                         params = NULL;
 555                         if (fepriv->state & FESTATE_RETUNE) {
 556                                 params = &fepriv->parameters;
 557                                 fepriv->state = FESTATE_TUNED;
 558                         }
 559
 560                         fe->ops->tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
 561                         if (s != fepriv->status) {
 562                                 dvb_frontend_add_event(fe, s);
 563                                 fepriv->status = s;
 564                         }
 565                 } else {
 566                         dvb_frontend_swzigzag(fe);
 567                 }
 568         }
 569
 570         if (dvb_shutdown_timeout) {
 571                 if (dvb_powerdown_on_sleep)
 572                         if (fe->ops->set_voltage)
 573                                 fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF);
 574                 if (fe->ops->sleep)
 575                         fe->ops->sleep(fe);
 576         }
 577
 578         fepriv->thread_pid = 0;
 579         mb();
 580
 581         dvb_frontend_wakeup(fe);
 582         return 0;
 583 }
 584
 585 static void dvb_frontend_stop(struct dvb_frontend *fe)
 586 {
 587         unsigned long ret;
 588         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 589
 590         dprintk ("%s\n", __FUNCTION__);
 591
 592         fepriv->exit = 1;
 593         mb();
 594
 595         if (!fepriv->thread_pid)
 596                 return;
 597
 598         /* check if the thread is really alive */
 599         if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) {
 600                 printk("dvb_frontend_stop: thread PID %d already died\n",
 601                                 fepriv->thread_pid);
 602                 /* make sure the mutex was not held by the thread */
 603                 init_MUTEX (&fepriv->sem);
 604                 return;
 605         }
 606
 607         /* wake up the frontend thread, so it notices that fe->exit == 1 */
 608         dvb_frontend_wakeup(fe);
 609
 610         /* wait until the frontend thread has exited */
 611         ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid);
 612         if (-ERESTARTSYS != ret) {
 613                 fepriv->state = FESTATE_IDLE;
 614                 return;
 615         }
 616         fepriv->state = FESTATE_IDLE;
 617
 618         /* paranoia check in case a signal arrived */
 619         if (fepriv->thread_pid)
 620                 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
 621                                 fepriv->thread_pid);
 622 }
 623
 624 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
 625 {
 626         return ((curtime.tv_usec < lasttime.tv_usec) ?
 627                 1000000 - lasttime.tv_usec + curtime.tv_usec :
 628                 curtime.tv_usec - lasttime.tv_usec);
 629 }
 630 EXPORT_SYMBOL(timeval_usec_diff);
 631
 632 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
 633 {
 634         curtime->tv_usec += add_usec;
 635         if (curtime->tv_usec >= 1000000) {
 636                 curtime->tv_usec -= 1000000;
 637                 curtime->tv_sec++;
 638         }
 639 }
 640
 641 /*
 642  * Sleep until gettimeofday() > waketime + add_usec
 643  * This needs to be as precise as possible, but as the delay is
 644  * usually between 2ms and 32ms, it is done using a scheduled msleep
 645  * followed by usleep (normally a busy-wait loop) for the remainder
 646  */
 647 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
 648 {
 649         struct timeval lasttime;
 650         s32 delta, newdelta;
 651
 652         timeval_usec_add(waketime, add_usec);
 653
 654         do_gettimeofday(&lasttime);
 655         delta = timeval_usec_diff(lasttime, *waketime);
 656         if (delta > 2500) {
 657                 msleep((delta - 1500) / 1000);
 658                 do_gettimeofday(&lasttime);
 659                 newdelta = timeval_usec_diff(lasttime, *waketime);
 660                 delta = (newdelta > delta) ? 0 : newdelta;
 661         }
 662         if (delta > 0)
 663                 udelay(delta);
 664 }
 665 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 666
 667 static int dvb_frontend_start(struct dvb_frontend *fe)
 668 {
 669         int ret;
 670         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 671
 672         dprintk ("%s\n", __FUNCTION__);
 673
 674         if (fepriv->thread_pid) {
 675                 if (!fepriv->exit)
 676                         return 0;
 677                 else
 678                         dvb_frontend_stop (fe);
 679         }
 680
 681         if (signal_pending(current))
 682                 return -EINTR;
 683         if (down_interruptible (&fepriv->sem))
 684                 return -EINTR;
 685
 686         fepriv->state = FESTATE_IDLE;
 687         fepriv->exit = 0;
 688         fepriv->thread_pid = 0;
 689         mb();
 690
 691         ret = kernel_thread (dvb_frontend_thread, fe, 0);
 692
 693         if (ret < 0) {
 694                 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
 695                 up(&fepriv->sem);
 696                 return ret;
 697         }
 698         fepriv->thread_pid = ret;
 699
 700         return 0;
 701 }
 702
 703 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
 704                         unsigned int cmd, void *parg)
 705 {
 706         struct dvb_device *dvbdev = file->private_data;
 707         struct dvb_frontend *fe = dvbdev->priv;
 708         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 709         int err = -EOPNOTSUPP;
 710
 711         dprintk ("%s\n", __FUNCTION__);
 712
 713         if (!fe || fepriv->exit)
 714                 return -ENODEV;
 715
 716         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
 717             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
 718              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
 719                 return -EPERM;
 720
 721         if (down_interruptible (&fepriv->sem))
 722                 return -ERESTARTSYS;
 723
 724         switch (cmd) {
 725         case FE_GET_INFO: {
 726                 struct dvb_frontend_info* info = parg;
 727                 memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info));
 728
 729                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
 730                  * do it, it is done for it. */
 731                 info->caps |= FE_CAN_INVERSION_AUTO;
 732                 err = 0;
 733                 break;
 734         }
 735
 736         case FE_READ_STATUS: {
 737                 fe_status_t* status = parg;
 738
 739                 /* if retune was requested but hasn't occured yet, prevent
 740                  * that user get signal state from previous tuning */
 741                 if(fepriv->state == FESTATE_RETUNE) {
 742                         err=0;
 743                         *status = 0;
 744                         break;
 745                 }
 746
 747                 if (fe->ops->read_status)
 748                         err = fe->ops->read_status(fe, status);
 749                 break;
 750         }
 751         case FE_READ_BER:
 752                 if (fe->ops->read_ber)
 753                         err = fe->ops->read_ber(fe, (__u32*) parg);
 754                 break;
 755
 756         case FE_READ_SIGNAL_STRENGTH:
 757                 if (fe->ops->read_signal_strength)
 758                         err = fe->ops->read_signal_strength(fe, (__u16*) parg);
 759                 break;
 760
 761         case FE_READ_SNR:
 762                 if (fe->ops->read_snr)
 763                         err = fe->ops->read_snr(fe, (__u16*) parg);
 764                 break;
 765
 766         case FE_READ_UNCORRECTED_BLOCKS:
 767                 if (fe->ops->read_ucblocks)
 768                         err = fe->ops->read_ucblocks(fe, (__u32*) parg);
 769                 break;
 770
 771
 772         case FE_DISEQC_RESET_OVERLOAD:
 773                 if (fe->ops->diseqc_reset_overload) {
 774                         err = fe->ops->diseqc_reset_overload(fe);
 775                         fepriv->state = FESTATE_DISEQC;
 776                         fepriv->status = 0;
 777                 }
 778                 break;
 779
 780         case FE_DISEQC_SEND_MASTER_CMD:
 781                 if (fe->ops->diseqc_send_master_cmd) {
 782                         err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
 783                         fepriv->state = FESTATE_DISEQC;
 784                         fepriv->status = 0;
 785                 }
 786                 break;
 787
 788         case FE_DISEQC_SEND_BURST:
 789                 if (fe->ops->diseqc_send_burst) {
 790                         err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
 791                         fepriv->state = FESTATE_DISEQC;
 792                         fepriv->status = 0;
 793                 }
 794                 break;
 795
 796         case FE_SET_TONE:
 797                 if (fe->ops->set_tone) {
 798                         err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg);
 799                         fepriv->tone = (fe_sec_tone_mode_t) parg;
 800                         fepriv->state = FESTATE_DISEQC;
 801                         fepriv->status = 0;
 802                 }
 803                 break;
 804
 805         case FE_SET_VOLTAGE:
 806                 if (fe->ops->set_voltage) {
 807                         err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg);
 808                         fepriv->voltage = (fe_sec_voltage_t) parg;
 809                         fepriv->state = FESTATE_DISEQC;
 810                         fepriv->status = 0;
 811                 }
 812                 break;
 813
 814         case FE_DISHNETWORK_SEND_LEGACY_CMD:
 815                 if (fe->ops->dishnetwork_send_legacy_command) {
 816                         err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned long) parg);
 817                         fepriv->state = FESTATE_DISEQC;
 818                         fepriv->status = 0;
 819                 } else if (fe->ops->set_voltage) {
 820                         /*
 821                          * NOTE: This is a fallback condition.  Some frontends
 822                          * (stv0299 for instance) take longer than 8msec to
 823                          * respond to a set_voltage command.  Those switches
 824                          * need custom routines to switch properly.  For all
 825                          * other frontends, the following shoule work ok.
 826                          * Dish network legacy switches (as used by Dish500)
 827                          * are controlled by sending 9-bit command words
 828                          * spaced 8msec apart.
 829                          * the actual command word is switch/port dependant
 830                          * so it is up to the userspace application to send
 831                          * the right command.
 832                          * The command must always start with a '0' after
 833                          * initialization, so parg is 8 bits and does not
 834                          * include the initialization or start bit
 835                          */
 836                         unsigned long cmd = ((unsigned long) parg) << 1;
 837                         struct timeval nexttime;
 838                         struct timeval tv[10];
 839                         int i;
 840                         u8 last = 1;
 841                         if (dvb_frontend_debug)
 842                                 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
 843                         do_gettimeofday(&nexttime);
 844                         if (dvb_frontend_debug)
 845                                 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
 846                         /* before sending a command, initialize by sending
 847                          * a 32ms 18V to the switch
 848                          */
 849                         fe->ops->set_voltage(fe, SEC_VOLTAGE_18);
 850                         dvb_frontend_sleep_until(&nexttime, 32000);
 851
 852                         for (i = 0; i < 9; i++) {
 853                                 if (dvb_frontend_debug)
 854                                         do_gettimeofday(&tv[i + 1]);
 855                                 if ((cmd & 0x01) != last) {
 856                                         /* set voltage to (last ? 13V : 18V) */
 857                                         fe->ops->set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
 858                                         last = (last) ? 0 : 1;
 859                                 }
 860                                 cmd = cmd >> 1;
 861                                 if (i != 8)
 862                                         dvb_frontend_sleep_until(&nexttime, 8000);
 863                         }
 864                         if (dvb_frontend_debug) {
 865                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
 866                                         __FUNCTION__, fe->dvb->num);
 867                                 for (i = 1; i < 10; i++)
 868                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
 869                         }
 870                         err = 0;
 871                         fepriv->state = FESTATE_DISEQC;
 872                         fepriv->status = 0;
 873                 }
 874                 break;
 875
 876         case FE_DISEQC_RECV_SLAVE_REPLY:
 877                 if (fe->ops->diseqc_recv_slave_reply)
 878                         err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
 879                 break;
 880
 881         case FE_ENABLE_HIGH_LNB_VOLTAGE:
 882                 if (fe->ops->enable_high_lnb_voltage)
 883                         err = fe->ops->enable_high_lnb_voltage(fe, (long) parg);
 884                 break;
 885
 886         case FE_SET_FRONTEND: {
 887                 struct dvb_frontend_tune_settings fetunesettings;
 888
 889                 memcpy (&fepriv->parameters, parg,
 890                         sizeof (struct dvb_frontend_parameters));
 891
 892                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
 893                 memcpy(&fetunesettings.parameters, parg,
 894                        sizeof (struct dvb_frontend_parameters));
 895
 896                 /* force auto frequency inversion if requested */
 897                 if (dvb_force_auto_inversion) {
 898                         fepriv->parameters.inversion = INVERSION_AUTO;
 899                         fetunesettings.parameters.inversion = INVERSION_AUTO;
 900                 }
 901                 if (fe->ops->info.type == FE_OFDM) {
 902                         /* without hierachical coding code_rate_LP is irrelevant,
 903                          * so we tolerate the otherwise invalid FEC_NONE setting */
 904                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
 905                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
 906                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
 907                 }
 908
 909                 /* get frontend-specific tuning settings */
 910                 if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) {
 911                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
 912                         fepriv->max_drift = fetunesettings.max_drift;
 913                         fepriv->step_size = fetunesettings.step_size;
 914                 } else {
 915                         /* default values */
 916                         switch(fe->ops->info.type) {
 917                         case FE_QPSK:
 918                                 fepriv->min_delay = HZ/20;
 919                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
 920                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
 921                                 break;
 922
 923                         case FE_QAM:
 924                                 fepriv->min_delay = HZ/20;
 925                                 fepriv->step_size = 0; /* no zigzag */
 926                                 fepriv->max_drift = 0;
 927                                 break;
 928
 929                         case FE_OFDM:
 930                                 fepriv->min_delay = HZ/20;
 931                                 fepriv->step_size = fe->ops->info.frequency_stepsize * 2;
 932                                 fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1;
 933                                 break;
 934                         case FE_ATSC:
 935                                 printk("dvb-core: FE_ATSC not handled yet.\n");
 936                                 break;
 937                         }
 938                 }
 939                 if (dvb_override_tune_delay > 0)
 940                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
 941
 942                 fepriv->state = FESTATE_RETUNE;
 943                 dvb_frontend_wakeup(fe);
 944                 dvb_frontend_add_event(fe, 0);
 945                 fepriv->status = 0;
 946                 err = 0;
 947                 break;
 948         }
 949
 950         case FE_GET_EVENT:
 951                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
 952                 break;
 953
 954         case FE_GET_FRONTEND:
 955                 if (fe->ops->get_frontend) {
 956                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
 957                         err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg);
 958                 }
 959                 break;
 960
 961         case FE_SET_FRONTEND_TUNE_MODE:
 962                 fepriv->tune_mode_flags = (unsigned long) parg;
 963                 break;
 964         };
 965
 966         up (&fepriv->sem);
 967         return err;
 968 }
 969
 970 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
 971 {
 972         struct dvb_device *dvbdev = file->private_data;
 973         struct dvb_frontend *fe = dvbdev->priv;
 974         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 975
 976         dprintk ("%s\n", __FUNCTION__);
 977
 978         poll_wait (file, &fepriv->events.wait_queue, wait);
 979
 980         if (fepriv->events.eventw != fepriv->events.eventr)
 981                 return (POLLIN | POLLRDNORM | POLLPRI);
 982
 983         return 0;
 984 }
 985
 986 static int dvb_frontend_open(struct inode *inode, struct file *file)
 987 {
 988         struct dvb_device *dvbdev = file->private_data;
 989         struct dvb_frontend *fe = dvbdev->priv;
 990         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 991         int ret;
 992
 993         dprintk ("%s\n", __FUNCTION__);
 994
 995         if ((ret = dvb_generic_open (inode, file)) < 0)
 996                 return ret;
 997
 998         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 999                 ret = dvb_frontend_start (fe);
1000                 if (ret)
1001                         dvb_generic_release (inode, file);
1002
1003                 /*  empty event queue */
1004                 fepriv->events.eventr = fepriv->events.eventw = 0;
1005
1006                 /* normal tune mode when opened R/W */
1007                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
1008                 fepriv->tone = -1;
1009                 fepriv->voltage = -1;
1010         }
1011
1012         return ret;
1013 }
1014
1015 static int dvb_frontend_release(struct inode *inode, struct file *file)
1016 {
1017         struct dvb_device *dvbdev = file->private_data;
1018         struct dvb_frontend *fe = dvbdev->priv;
1019         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1020
1021         dprintk ("%s\n", __FUNCTION__);
1022
1023         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1024                 fepriv->release_jiffies = jiffies;
1025
1026         return dvb_generic_release (inode, file);
1027 }
1028
1029 static struct file_operations dvb_frontend_fops = {
1030         .owner          = THIS_MODULE,
1031         .ioctl          = dvb_generic_ioctl,
1032         .poll           = dvb_frontend_poll,
1033         .open           = dvb_frontend_open,
1034         .release        = dvb_frontend_release
1035 };
1036
1037 int dvb_register_frontend(struct dvb_adapter* dvb,
1038                           struct dvb_frontend* fe)
1039 {
1040         struct dvb_frontend_private *fepriv;
1041         static const struct dvb_device dvbdev_template = {
1042                 .users = ~0,
1043                 .writers = 1,
1044                 .readers = (~0)-1,
1045                 .fops = &dvb_frontend_fops,
1046                 .kernel_ioctl = dvb_frontend_ioctl
1047         };
1048
1049         dprintk ("%s\n", __FUNCTION__);
1050
1051         if (mutex_lock_interruptible(&frontend_mutex))
1052                 return -ERESTARTSYS;
1053
1054         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1055         if (fe->frontend_priv == NULL) {
1056                 mutex_unlock(&frontend_mutex);
1057                 return -ENOMEM;
1058         }
1059         fepriv = fe->frontend_priv;
1060
1061         init_MUTEX (&fepriv->sem);
1062         init_waitqueue_head (&fepriv->wait_queue);
1063         init_waitqueue_head (&fepriv->events.wait_queue);
1064         init_MUTEX (&fepriv->events.sem);
1065         fe->dvb = dvb;
1066         fepriv->inversion = INVERSION_OFF;
1067
1068         printk ("DVB: registering frontend %i (%s)...\n",
1069                 fe->dvb->num,
1070                 fe->ops->info.name);
1071
1072         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1073                              fe, DVB_DEVICE_FRONTEND);
1074
1075         mutex_unlock(&frontend_mutex);
1076         return 0;
1077 }
1078 EXPORT_SYMBOL(dvb_register_frontend);
1079
1080 int dvb_unregister_frontend(struct dvb_frontend* fe)
1081 {
1082         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1083         dprintk ("%s\n", __FUNCTION__);
1084
1085         mutex_lock(&frontend_mutex);
1086         dvb_unregister_device (fepriv->dvbdev);
1087         dvb_frontend_stop (fe);
1088         if (fe->ops->release)
1089                 fe->ops->release(fe);
1090         else
1091                 printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name);
1092         /* fe is invalid now */
1093         kfree(fepriv);
1094         mutex_unlock(&frontend_mutex);
1095         return 0;
1096 }
1097 EXPORT_SYMBOL(dvb_unregister_frontend);