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/freezer.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/kthread.h>
  40 #include <asm/processor.h>
  41
  42 #include "dvb_frontend.h"
  43 #include "dvbdev.h"
  44
  45 static int dvb_frontend_debug;
  46 static int dvb_shutdown_timeout = 5;
  47 static int dvb_force_auto_inversion;
  48 static int dvb_override_tune_delay;
  49 static int dvb_powerdown_on_sleep = 1;
  50
  51 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  52 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  53 module_param(dvb_shutdown_timeout, int, 0644);
  54 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  55 module_param(dvb_force_auto_inversion, int, 0644);
  56 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  57 module_param(dvb_override_tune_delay, int, 0644);
  58 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  59 module_param(dvb_powerdown_on_sleep, int, 0644);
  60 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  61
  62 #define dprintk if (dvb_frontend_debug) printk
  63
  64 #define FESTATE_IDLE 1
  65 #define FESTATE_RETUNE 2
  66 #define FESTATE_TUNING_FAST 4
  67 #define FESTATE_TUNING_SLOW 8
  68 #define FESTATE_TUNED 16
  69 #define FESTATE_ZIGZAG_FAST 32
  70 #define FESTATE_ZIGZAG_SLOW 64
  71 #define FESTATE_DISEQC 128
  72 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  73 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  74 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  75 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  76
  77 #define FE_ALGO_HW              1
  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 DEFINE_MUTEX(frontend_mutex);
  94
  95 struct dvb_frontend_private {
  96
  97         /* thread/frontend values */
  98         struct dvb_device *dvbdev;
  99         struct dvb_frontend_parameters parameters;
 100         struct dvb_fe_events events;
 101         struct semaphore sem;
 102         struct list_head list_head;
 103         wait_queue_head_t wait_queue;
 104         struct task_struct *thread;
 105         unsigned long release_jiffies;
 106         unsigned int exit;
 107         unsigned int wakeup;
 108         fe_status_t status;
 109         unsigned long tune_mode_flags;
 110         unsigned int delay;
 111         unsigned int reinitialise;
 112         int tone;
 113         int voltage;
 114
 115         /* swzigzag values */
 116         unsigned int state;
 117         unsigned int bending;
 118         int lnb_drift;
 119         unsigned int inversion;
 120         unsigned int auto_step;
 121         unsigned int auto_sub_step;
 122         unsigned int started_auto_step;
 123         unsigned int min_delay;
 124         unsigned int max_drift;
 125         unsigned int step_size;
 126         int quality;
 127         unsigned int check_wrapped;
 128 };
 129
 130 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 131
 132 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 133 {
 134         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 135         struct dvb_fe_events *events = &fepriv->events;
 136         struct dvb_frontend_event *e;
 137         int wp;
 138
 139         dprintk ("%s\n", __FUNCTION__);
 140
 141         if (down_interruptible (&events->sem))
 142                 return;
 143
 144         wp = (events->eventw + 1) % MAX_EVENT;
 145
 146         if (wp == events->eventr) {
 147                 events->overflow = 1;
 148                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 149         }
 150
 151         e = &events->events[events->eventw];
 152
 153         memcpy (&e->parameters, &fepriv->parameters,
 154                 sizeof (struct dvb_frontend_parameters));
 155
 156         if (status & FE_HAS_LOCK)
 157                 if (fe->ops.get_frontend)
 158                         fe->ops.get_frontend(fe, &e->parameters);
 159
 160         events->eventw = wp;
 161
 162         up (&events->sem);
 163
 164         e->status = status;
 165
 166         wake_up_interruptible (&events->wait_queue);
 167 }
 168
 169 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 170                             struct dvb_frontend_event *event, int flags)
 171 {
 172         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 173         struct dvb_fe_events *events = &fepriv->events;
 174
 175         dprintk ("%s\n", __FUNCTION__);
 176
 177         if (events->overflow) {
 178                 events->overflow = 0;
 179                 return -EOVERFLOW;
 180         }
 181
 182         if (events->eventw == events->eventr) {
 183                 int ret;
 184
 185                 if (flags & O_NONBLOCK)
 186                         return -EWOULDBLOCK;
 187
 188                 up(&fepriv->sem);
 189
 190                 ret = wait_event_interruptible (events->wait_queue,
 191                                                 events->eventw != events->eventr);
 192
 193                 if (down_interruptible (&fepriv->sem))
 194                         return -ERESTARTSYS;
 195
 196                 if (ret < 0)
 197                         return ret;
 198         }
 199
 200         if (down_interruptible (&events->sem))
 201                 return -ERESTARTSYS;
 202
 203         memcpy (event, &events->events[events->eventr],
 204                 sizeof(struct dvb_frontend_event));
 205
 206         events->eventr = (events->eventr + 1) % MAX_EVENT;
 207
 208         up (&events->sem);
 209
 210         return 0;
 211 }
 212
 213 static void dvb_frontend_init(struct dvb_frontend *fe)
 214 {
 215         dprintk ("DVB: initialising frontend %i (%s)...\n",
 216                  fe->dvb->num,
 217                  fe->ops.info.name);
 218
 219         if (fe->ops.init)
 220                 fe->ops.init(fe);
 221         if (fe->ops.tuner_ops.init) {
 222                 fe->ops.tuner_ops.init(fe);
 223                 if (fe->ops.i2c_gate_ctrl)
 224                         fe->ops.i2c_gate_ctrl(fe, 0);
 225         }
 226 }
 227
 228 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 229 {
 230         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 231
 232         fepriv->reinitialise = 1;
 233         dvb_frontend_wakeup(fe);
 234 }
 235 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 236
 237 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 238 {
 239         int q2;
 240
 241         dprintk ("%s\n", __FUNCTION__);
 242
 243         if (locked)
 244                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 245         else
 246                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 247
 248         q2 = fepriv->quality - 128;
 249         q2 *= q2;
 250
 251         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 252 }
 253
 254 /**
 255  * Performs automatic twiddling of frontend parameters.
 256  *
 257  * @param fe The frontend concerned.
 258  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 259  * @returns Number of complete iterations that have been performed.
 260  */
 261 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 262 {
 263         int autoinversion;
 264         int ready = 0;
 265         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 266         int original_inversion = fepriv->parameters.inversion;
 267         u32 original_frequency = fepriv->parameters.frequency;
 268
 269         /* are we using autoinversion? */
 270         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 271                          (fepriv->parameters.inversion == INVERSION_AUTO));
 272
 273         /* setup parameters correctly */
 274         while(!ready) {
 275                 /* calculate the lnb_drift */
 276                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 277
 278                 /* wrap the auto_step if we've exceeded the maximum drift */
 279                 if (fepriv->lnb_drift > fepriv->max_drift) {
 280                         fepriv->auto_step = 0;
 281                         fepriv->auto_sub_step = 0;
 282                         fepriv->lnb_drift = 0;
 283                 }
 284
 285                 /* perform inversion and +/- zigzag */
 286                 switch(fepriv->auto_sub_step) {
 287                 case 0:
 288                         /* try with the current inversion and current drift setting */
 289                         ready = 1;
 290                         break;
 291
 292                 case 1:
 293                         if (!autoinversion) break;
 294
 295                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 296                         ready = 1;
 297                         break;
 298
 299                 case 2:
 300                         if (fepriv->lnb_drift == 0) break;
 301
 302                         fepriv->lnb_drift = -fepriv->lnb_drift;
 303                         ready = 1;
 304                         break;
 305
 306                 case 3:
 307                         if (fepriv->lnb_drift == 0) break;
 308                         if (!autoinversion) break;
 309
 310                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 311                         fepriv->lnb_drift = -fepriv->lnb_drift;
 312                         ready = 1;
 313                         break;
 314
 315                 default:
 316                         fepriv->auto_step++;
 317                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 318                         break;
 319                 }
 320
 321                 if (!ready) fepriv->auto_sub_step++;
 322         }
 323
 324         /* if this attempt would hit where we started, indicate a complete
 325          * iteration has occurred */
 326         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 327             (fepriv->auto_sub_step == 0) && check_wrapped) {
 328                 return 1;
 329         }
 330
 331         dprintk("%s: drift:%i inversion:%i auto_step:%i "
 332                 "auto_sub_step:%i started_auto_step:%i\n",
 333                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
 334                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
 335
 336         /* set the frontend itself */
 337         fepriv->parameters.frequency += fepriv->lnb_drift;
 338         if (autoinversion)
 339                 fepriv->parameters.inversion = fepriv->inversion;
 340         if (fe->ops.set_frontend)
 341                 fe->ops.set_frontend(fe, &fepriv->parameters);
 342
 343         fepriv->parameters.frequency = original_frequency;
 344         fepriv->parameters.inversion = original_inversion;
 345
 346         fepriv->auto_sub_step++;
 347         return 0;
 348 }
 349
 350 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 351 {
 352         fe_status_t s = 0;
 353         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 354
 355         /* if we've got no parameters, just keep idling */
 356         if (fepriv->state & FESTATE_IDLE) {
 357                 fepriv->delay = 3*HZ;
 358                 fepriv->quality = 0;
 359                 return;
 360         }
 361
 362         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 363         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 364                 if (fepriv->state & FESTATE_RETUNE) {
 365                         if (fe->ops.set_frontend)
 366                                 fe->ops.set_frontend(fe, &fepriv->parameters);
 367                         fepriv->state = FESTATE_TUNED;
 368                 }
 369                 fepriv->delay = 3*HZ;
 370                 fepriv->quality = 0;
 371                 return;
 372         }
 373
 374         /* get the frontend status */
 375         if (fepriv->state & FESTATE_RETUNE) {
 376                 s = 0;
 377         } else {
 378                 if (fe->ops.read_status)
 379                         fe->ops.read_status(fe, &s);
 380                 if (s != fepriv->status) {
 381                         dvb_frontend_add_event(fe, s);
 382                         fepriv->status = s;
 383                 }
 384         }
 385
 386         /* if we're not tuned, and we have a lock, move to the TUNED state */
 387         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 388                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 389                 fepriv->state = FESTATE_TUNED;
 390
 391                 /* if we're tuned, then we have determined the correct inversion */
 392                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 393                     (fepriv->parameters.inversion == INVERSION_AUTO)) {
 394                         fepriv->parameters.inversion = fepriv->inversion;
 395                 }
 396                 return;
 397         }
 398
 399         /* if we are tuned already, check we're still locked */
 400         if (fepriv->state & FESTATE_TUNED) {
 401                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 402
 403                 /* we're tuned, and the lock is still good... */
 404                 if (s & FE_HAS_LOCK) {
 405                         return;
 406                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 407                         fepriv->state = FESTATE_ZIGZAG_FAST;
 408                         fepriv->started_auto_step = fepriv->auto_step;
 409                         fepriv->check_wrapped = 0;
 410                 }
 411         }
 412
 413         /* don't actually do anything if we're in the LOSTLOCK state,
 414          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 415         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 416             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 417                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 418                 return;
 419         }
 420
 421         /* don't do anything if we're in the DISEQC state, since this
 422          * might be someone with a motorized dish controlled by DISEQC.
 423          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 424         if (fepriv->state & FESTATE_DISEQC) {
 425                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 426                 return;
 427         }
 428
 429         /* if we're in the RETUNE state, set everything up for a brand
 430          * new scan, keeping the current inversion setting, as the next
 431          * tune is _very_ likely to require the same */
 432         if (fepriv->state & FESTATE_RETUNE) {
 433                 fepriv->lnb_drift = 0;
 434                 fepriv->auto_step = 0;
 435                 fepriv->auto_sub_step = 0;
 436                 fepriv->started_auto_step = 0;
 437                 fepriv->check_wrapped = 0;
 438         }
 439
 440         /* fast zigzag. */
 441         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 442                 fepriv->delay = fepriv->min_delay;
 443
 444                 /* peform a tune */
 445                 if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
 446                         /* OK, if we've run out of trials at the fast speed.
 447                          * Drop back to slow for the _next_ attempt */
 448                         fepriv->state = FESTATE_SEARCHING_SLOW;
 449                         fepriv->started_auto_step = fepriv->auto_step;
 450                         return;
 451                 }
 452                 fepriv->check_wrapped = 1;
 453
 454                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 455                  * This ensures we cannot return from an
 456                  * FE_SET_FRONTEND ioctl before the first frontend tune
 457                  * occurs */
 458                 if (fepriv->state & FESTATE_RETUNE) {
 459                         fepriv->state = FESTATE_TUNING_FAST;
 460                 }
 461         }
 462
 463         /* slow zigzag */
 464         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 465                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 466
 467                 /* Note: don't bother checking for wrapping; we stay in this
 468                  * state until we get a lock */
 469                 dvb_frontend_swzigzag_autotune(fe, 0);
 470         }
 471 }
 472
 473 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 474 {
 475         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 476
 477         if (fepriv->exit)
 478                 return 1;
 479
 480         if (fepriv->dvbdev->writers == 1)
 481                 if (time_after(jiffies, fepriv->release_jiffies +
 482                                   dvb_shutdown_timeout * HZ))
 483                         return 1;
 484
 485         return 0;
 486 }
 487
 488 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 489 {
 490         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 491
 492         if (fepriv->wakeup) {
 493                 fepriv->wakeup = 0;
 494                 return 1;
 495         }
 496         return dvb_frontend_is_exiting(fe);
 497 }
 498
 499 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 500 {
 501         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 502
 503         fepriv->wakeup = 1;
 504         wake_up_interruptible(&fepriv->wait_queue);
 505 }
 506
 507 static int dvb_frontend_thread(void *data)
 508 {
 509         struct dvb_frontend *fe = data;
 510         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 511         unsigned long timeout;
 512         fe_status_t s;
 513         struct dvb_frontend_parameters *params;
 514
 515         dprintk("%s\n", __FUNCTION__);
 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 = 0;
 523
 524         dvb_frontend_init(fe);
 525
 526         while (1) {
 527                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 528 restart:
 529                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
 530                         dvb_frontend_should_wakeup(fe) || kthread_should_stop(),
 531                         fepriv->delay);
 532
 533                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 534                         /* got signal or quitting */
 535                         break;
 536                 }
 537
 538                 if (try_to_freeze())
 539                         goto restart;
 540
 541                 if (down_interruptible(&fepriv->sem))
 542                         break;
 543
 544                 if (fepriv->reinitialise) {
 545                         dvb_frontend_init(fe);
 546                         if (fepriv->tone != -1) {
 547                                 fe->ops.set_tone(fe, fepriv->tone);
 548                         }
 549                         if (fepriv->voltage != -1) {
 550                                 fe->ops.set_voltage(fe, fepriv->voltage);
 551                         }
 552                         fepriv->reinitialise = 0;
 553                 }
 554
 555                 /* do an iteration of the tuning loop */
 556                 if (fe->ops.get_frontend_algo) {
 557                         if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
 558                                 /* have we been asked to retune? */
 559                                 params = NULL;
 560                                 if (fepriv->state & FESTATE_RETUNE) {
 561                                         params = &fepriv->parameters;
 562                                         fepriv->state = FESTATE_TUNED;
 563                                 }
 564
 565                                 fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
 566                                 if (s != fepriv->status) {
 567                                         dvb_frontend_add_event(fe, s);
 568                                         fepriv->status = s;
 569                                 }
 570                         } else
 571                                 dvb_frontend_swzigzag(fe);
 572                 } else
 573                         dvb_frontend_swzigzag(fe);
 574         }
 575
 576         if (dvb_shutdown_timeout) {
 577                 if (dvb_powerdown_on_sleep)
 578                         if (fe->ops.set_voltage)
 579                                 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 580                 if (fe->ops.tuner_ops.sleep) {
 581                         fe->ops.tuner_ops.sleep(fe);
 582                         if (fe->ops.i2c_gate_ctrl)
 583                                 fe->ops.i2c_gate_ctrl(fe, 0);
 584                 }
 585                 if (fe->ops.sleep)
 586                         fe->ops.sleep(fe);
 587         }
 588
 589         fepriv->thread = NULL;
 590         mb();
 591
 592         dvb_frontend_wakeup(fe);
 593         return 0;
 594 }
 595
 596 static void dvb_frontend_stop(struct dvb_frontend *fe)
 597 {
 598         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 599
 600         dprintk ("%s\n", __FUNCTION__);
 601
 602         fepriv->exit = 1;
 603         mb();
 604
 605         if (!fepriv->thread)
 606                 return;
 607
 608         kthread_stop(fepriv->thread);
 609
 610         init_MUTEX (&fepriv->sem);
 611         fepriv->state = FESTATE_IDLE;
 612
 613         /* paranoia check in case a signal arrived */
 614         if (fepriv->thread)
 615                 printk("dvb_frontend_stop: warning: thread %p won't exit\n",
 616                                 fepriv->thread);
 617 }
 618
 619 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
 620 {
 621         return ((curtime.tv_usec < lasttime.tv_usec) ?
 622                 1000000 - lasttime.tv_usec + curtime.tv_usec :
 623                 curtime.tv_usec - lasttime.tv_usec);
 624 }
 625 EXPORT_SYMBOL(timeval_usec_diff);
 626
 627 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
 628 {
 629         curtime->tv_usec += add_usec;
 630         if (curtime->tv_usec >= 1000000) {
 631                 curtime->tv_usec -= 1000000;
 632                 curtime->tv_sec++;
 633         }
 634 }
 635
 636 /*
 637  * Sleep until gettimeofday() > waketime + add_usec
 638  * This needs to be as precise as possible, but as the delay is
 639  * usually between 2ms and 32ms, it is done using a scheduled msleep
 640  * followed by usleep (normally a busy-wait loop) for the remainder
 641  */
 642 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
 643 {
 644         struct timeval lasttime;
 645         s32 delta, newdelta;
 646
 647         timeval_usec_add(waketime, add_usec);
 648
 649         do_gettimeofday(&lasttime);
 650         delta = timeval_usec_diff(lasttime, *waketime);
 651         if (delta > 2500) {
 652                 msleep((delta - 1500) / 1000);
 653                 do_gettimeofday(&lasttime);
 654                 newdelta = timeval_usec_diff(lasttime, *waketime);
 655                 delta = (newdelta > delta) ? 0 : newdelta;
 656         }
 657         if (delta > 0)
 658                 udelay(delta);
 659 }
 660 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 661
 662 static int dvb_frontend_start(struct dvb_frontend *fe)
 663 {
 664         int ret;
 665         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 666         struct task_struct *fe_thread;
 667
 668         dprintk ("%s\n", __FUNCTION__);
 669
 670         if (fepriv->thread) {
 671                 if (!fepriv->exit)
 672                         return 0;
 673                 else
 674                         dvb_frontend_stop (fe);
 675         }
 676
 677         if (signal_pending(current))
 678                 return -EINTR;
 679         if (down_interruptible (&fepriv->sem))
 680                 return -EINTR;
 681
 682         fepriv->state = FESTATE_IDLE;
 683         fepriv->exit = 0;
 684         fepriv->thread = NULL;
 685         mb();
 686
 687         fe_thread = kthread_run(dvb_frontend_thread, fe,
 688                 "kdvb-fe-%i", fe->dvb->num);
 689         if (IS_ERR(fe_thread)) {
 690                 ret = PTR_ERR(fe_thread);
 691                 printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
 692                 up(&fepriv->sem);
 693                 return ret;
 694         }
 695         fepriv->thread = fe_thread;
 696         return 0;
 697 }
 698
 699 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
 700                         unsigned int cmd, void *parg)
 701 {
 702         struct dvb_device *dvbdev = file->private_data;
 703         struct dvb_frontend *fe = dvbdev->priv;
 704         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 705         int err = -EOPNOTSUPP;
 706
 707         dprintk ("%s\n", __FUNCTION__);
 708
 709         if (!fe || fepriv->exit)
 710                 return -ENODEV;
 711
 712         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
 713             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
 714              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
 715                 return -EPERM;
 716
 717         if (down_interruptible (&fepriv->sem))
 718                 return -ERESTARTSYS;
 719
 720         switch (cmd) {
 721         case FE_GET_INFO: {
 722                 struct dvb_frontend_info* info = parg;
 723                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
 724
 725                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
 726                  * do it, it is done for it. */
 727                 info->caps |= FE_CAN_INVERSION_AUTO;
 728                 err = 0;
 729                 break;
 730         }
 731
 732         case FE_READ_STATUS: {
 733                 fe_status_t* status = parg;
 734
 735                 /* if retune was requested but hasn't occured yet, prevent
 736                  * that user get signal state from previous tuning */
 737                 if(fepriv->state == FESTATE_RETUNE) {
 738                         err=0;
 739                         *status = 0;
 740                         break;
 741                 }
 742
 743                 if (fe->ops.read_status)
 744                         err = fe->ops.read_status(fe, status);
 745                 break;
 746         }
 747         case FE_READ_BER:
 748                 if (fe->ops.read_ber)
 749                         err = fe->ops.read_ber(fe, (__u32*) parg);
 750                 break;
 751
 752         case FE_READ_SIGNAL_STRENGTH:
 753                 if (fe->ops.read_signal_strength)
 754                         err = fe->ops.read_signal_strength(fe, (__u16*) parg);
 755                 break;
 756
 757         case FE_READ_SNR:
 758                 if (fe->ops.read_snr)
 759                         err = fe->ops.read_snr(fe, (__u16*) parg);
 760                 break;
 761
 762         case FE_READ_UNCORRECTED_BLOCKS:
 763                 if (fe->ops.read_ucblocks)
 764                         err = fe->ops.read_ucblocks(fe, (__u32*) parg);
 765                 break;
 766
 767
 768         case FE_DISEQC_RESET_OVERLOAD:
 769                 if (fe->ops.diseqc_reset_overload) {
 770                         err = fe->ops.diseqc_reset_overload(fe);
 771                         fepriv->state = FESTATE_DISEQC;
 772                         fepriv->status = 0;
 773                 }
 774                 break;
 775
 776         case FE_DISEQC_SEND_MASTER_CMD:
 777                 if (fe->ops.diseqc_send_master_cmd) {
 778                         err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
 779                         fepriv->state = FESTATE_DISEQC;
 780                         fepriv->status = 0;
 781                 }
 782                 break;
 783
 784         case FE_DISEQC_SEND_BURST:
 785                 if (fe->ops.diseqc_send_burst) {
 786                         err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
 787                         fepriv->state = FESTATE_DISEQC;
 788                         fepriv->status = 0;
 789                 }
 790                 break;
 791
 792         case FE_SET_TONE:
 793                 if (fe->ops.set_tone) {
 794                         err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
 795                         fepriv->tone = (fe_sec_tone_mode_t) parg;
 796                         fepriv->state = FESTATE_DISEQC;
 797                         fepriv->status = 0;
 798                 }
 799                 break;
 800
 801         case FE_SET_VOLTAGE:
 802                 if (fe->ops.set_voltage) {
 803                         err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
 804                         fepriv->voltage = (fe_sec_voltage_t) parg;
 805                         fepriv->state = FESTATE_DISEQC;
 806                         fepriv->status = 0;
 807                 }
 808                 break;
 809
 810         case FE_DISHNETWORK_SEND_LEGACY_CMD:
 811                 if (fe->ops.dishnetwork_send_legacy_command) {
 812                         err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
 813                         fepriv->state = FESTATE_DISEQC;
 814                         fepriv->status = 0;
 815                 } else if (fe->ops.set_voltage) {
 816                         /*
 817                          * NOTE: This is a fallback condition.  Some frontends
 818                          * (stv0299 for instance) take longer than 8msec to
 819                          * respond to a set_voltage command.  Those switches
 820                          * need custom routines to switch properly.  For all
 821                          * other frontends, the following shoule work ok.
 822                          * Dish network legacy switches (as used by Dish500)
 823                          * are controlled by sending 9-bit command words
 824                          * spaced 8msec apart.
 825                          * the actual command word is switch/port dependant
 826                          * so it is up to the userspace application to send
 827                          * the right command.
 828                          * The command must always start with a '0' after
 829                          * initialization, so parg is 8 bits and does not
 830                          * include the initialization or start bit
 831                          */
 832                         unsigned long cmd = ((unsigned long) parg) << 1;
 833                         struct timeval nexttime;
 834                         struct timeval tv[10];
 835                         int i;
 836                         u8 last = 1;
 837                         if (dvb_frontend_debug)
 838                                 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
 839                         do_gettimeofday(&nexttime);
 840                         if (dvb_frontend_debug)
 841                                 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
 842                         /* before sending a command, initialize by sending
 843                          * a 32ms 18V to the switch
 844                          */
 845                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
 846                         dvb_frontend_sleep_until(&nexttime, 32000);
 847
 848                         for (i = 0; i < 9; i++) {
 849                                 if (dvb_frontend_debug)
 850                                         do_gettimeofday(&tv[i + 1]);
 851                                 if ((cmd & 0x01) != last) {
 852                                         /* set voltage to (last ? 13V : 18V) */
 853                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
 854                                         last = (last) ? 0 : 1;
 855                                 }
 856                                 cmd = cmd >> 1;
 857                                 if (i != 8)
 858                                         dvb_frontend_sleep_until(&nexttime, 8000);
 859                         }
 860                         if (dvb_frontend_debug) {
 861                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
 862                                         __FUNCTION__, fe->dvb->num);
 863                                 for (i = 1; i < 10; i++)
 864                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
 865                         }
 866                         err = 0;
 867                         fepriv->state = FESTATE_DISEQC;
 868                         fepriv->status = 0;
 869                 }
 870                 break;
 871
 872         case FE_DISEQC_RECV_SLAVE_REPLY:
 873                 if (fe->ops.diseqc_recv_slave_reply)
 874                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
 875                 break;
 876
 877         case FE_ENABLE_HIGH_LNB_VOLTAGE:
 878                 if (fe->ops.enable_high_lnb_voltage)
 879                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
 880                 break;
 881
 882         case FE_SET_FRONTEND: {
 883                 struct dvb_frontend_tune_settings fetunesettings;
 884
 885                 memcpy (&fepriv->parameters, parg,
 886                         sizeof (struct dvb_frontend_parameters));
 887
 888                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
 889                 memcpy(&fetunesettings.parameters, parg,
 890                        sizeof (struct dvb_frontend_parameters));
 891
 892                 /* force auto frequency inversion if requested */
 893                 if (dvb_force_auto_inversion) {
 894                         fepriv->parameters.inversion = INVERSION_AUTO;
 895                         fetunesettings.parameters.inversion = INVERSION_AUTO;
 896                 }
 897                 if (fe->ops.info.type == FE_OFDM) {
 898                         /* without hierarchical coding code_rate_LP is irrelevant,
 899                          * so we tolerate the otherwise invalid FEC_NONE setting */
 900                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
 901                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
 902                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
 903                 }
 904
 905                 /* get frontend-specific tuning settings */
 906                 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
 907                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
 908                         fepriv->max_drift = fetunesettings.max_drift;
 909                         fepriv->step_size = fetunesettings.step_size;
 910                 } else {
 911                         /* default values */
 912                         switch(fe->ops.info.type) {
 913                         case FE_QPSK:
 914                                 fepriv->min_delay = HZ/20;
 915                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
 916                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
 917                                 break;
 918
 919                         case FE_QAM:
 920                                 fepriv->min_delay = HZ/20;
 921                                 fepriv->step_size = 0; /* no zigzag */
 922                                 fepriv->max_drift = 0;
 923                                 break;
 924
 925                         case FE_OFDM:
 926                                 fepriv->min_delay = HZ/20;
 927                                 fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
 928                                 fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
 929                                 break;
 930                         case FE_ATSC:
 931                                 fepriv->min_delay = HZ/20;
 932                                 fepriv->step_size = 0;
 933                                 fepriv->max_drift = 0;
 934                                 break;
 935                         }
 936                 }
 937                 if (dvb_override_tune_delay > 0)
 938                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
 939
 940                 fepriv->state = FESTATE_RETUNE;
 941                 dvb_frontend_wakeup(fe);
 942                 dvb_frontend_add_event(fe, 0);
 943                 fepriv->status = 0;
 944                 err = 0;
 945                 break;
 946         }
 947
 948         case FE_GET_EVENT:
 949                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
 950                 break;
 951
 952         case FE_GET_FRONTEND:
 953                 if (fe->ops.get_frontend) {
 954                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
 955                         err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
 956                 }
 957                 break;
 958
 959         case FE_SET_FRONTEND_TUNE_MODE:
 960                 fepriv->tune_mode_flags = (unsigned long) parg;
 961                 err = 0;
 962                 break;
 963         };
 964
 965         up (&fepriv->sem);
 966         return err;
 967 }
 968
 969 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
 970 {
 971         struct dvb_device *dvbdev = file->private_data;
 972         struct dvb_frontend *fe = dvbdev->priv;
 973         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 974
 975         dprintk ("%s\n", __FUNCTION__);
 976
 977         poll_wait (file, &fepriv->events.wait_queue, wait);
 978
 979         if (fepriv->events.eventw != fepriv->events.eventr)
 980                 return (POLLIN | POLLRDNORM | POLLPRI);
 981
 982         return 0;
 983 }
 984
 985 static int dvb_frontend_open(struct inode *inode, struct file *file)
 986 {
 987         struct dvb_device *dvbdev = file->private_data;
 988         struct dvb_frontend *fe = dvbdev->priv;
 989         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 990         int ret;
 991
 992         dprintk ("%s\n", __FUNCTION__);
 993
 994         if ((ret = dvb_generic_open (inode, file)) < 0)
 995                 return ret;
 996
 997         if (fe->ops.ts_bus_ctrl) {
 998                 if ((ret = fe->ops.ts_bus_ctrl (fe, 1)) < 0) {
 999                         dvb_generic_release (inode, file);
1000                         return ret;
1001                 }
1002         }
1003
1004         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
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                 ret = dvb_frontend_start (fe);
1012                 if (ret)
1013                         dvb_generic_release (inode, file);
1014
1015                 /*  empty event queue */
1016                 fepriv->events.eventr = fepriv->events.eventw = 0;
1017         }
1018
1019         return ret;
1020 }
1021
1022 static int dvb_frontend_release(struct inode *inode, struct file *file)
1023 {
1024         struct dvb_device *dvbdev = file->private_data;
1025         struct dvb_frontend *fe = dvbdev->priv;
1026         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1027         int ret;
1028
1029         dprintk ("%s\n", __FUNCTION__);
1030
1031         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1032                 fepriv->release_jiffies = jiffies;
1033
1034         if (fe->ops.ts_bus_ctrl)
1035                 fe->ops.ts_bus_ctrl (fe, 0);
1036
1037         ret = dvb_generic_release (inode, file);
1038
1039         if (dvbdev->users==-1 && fepriv->exit==1) {
1040                 fops_put(file->f_op);
1041                 file->f_op = NULL;
1042                 wake_up(&dvbdev->wait_queue);
1043         }
1044         return ret;
1045 }
1046
1047 static struct file_operations dvb_frontend_fops = {
1048         .owner          = THIS_MODULE,
1049         .ioctl          = dvb_generic_ioctl,
1050         .poll           = dvb_frontend_poll,
1051         .open           = dvb_frontend_open,
1052         .release        = dvb_frontend_release
1053 };
1054
1055 int dvb_register_frontend(struct dvb_adapter* dvb,
1056                           struct dvb_frontend* fe)
1057 {
1058         struct dvb_frontend_private *fepriv;
1059         static const struct dvb_device dvbdev_template = {
1060                 .users = ~0,
1061                 .writers = 1,
1062                 .readers = (~0)-1,
1063                 .fops = &dvb_frontend_fops,
1064                 .kernel_ioctl = dvb_frontend_ioctl
1065         };
1066
1067         dprintk ("%s\n", __FUNCTION__);
1068
1069         if (mutex_lock_interruptible(&frontend_mutex))
1070                 return -ERESTARTSYS;
1071
1072         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1073         if (fe->frontend_priv == NULL) {
1074                 mutex_unlock(&frontend_mutex);
1075                 return -ENOMEM;
1076         }
1077         fepriv = fe->frontend_priv;
1078
1079         init_MUTEX (&fepriv->sem);
1080         init_waitqueue_head (&fepriv->wait_queue);
1081         init_waitqueue_head (&fepriv->events.wait_queue);
1082         init_MUTEX (&fepriv->events.sem);
1083         fe->dvb = dvb;
1084         fepriv->inversion = INVERSION_OFF;
1085
1086         printk ("DVB: registering frontend %i (%s)...\n",
1087                 fe->dvb->num,
1088                 fe->ops.info.name);
1089
1090         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1091                              fe, DVB_DEVICE_FRONTEND);
1092
1093         mutex_unlock(&frontend_mutex);
1094         return 0;
1095 }
1096 EXPORT_SYMBOL(dvb_register_frontend);
1097
1098 int dvb_unregister_frontend(struct dvb_frontend* fe)
1099 {
1100         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1101         dprintk ("%s\n", __FUNCTION__);
1102
1103         mutex_lock(&frontend_mutex);
1104         dvb_frontend_stop (fe);
1105         mutex_unlock(&frontend_mutex);
1106
1107         if (fepriv->dvbdev->users < -1)
1108                 wait_event(fepriv->dvbdev->wait_queue,
1109                                 fepriv->dvbdev->users==-1);
1110
1111         mutex_lock(&frontend_mutex);
1112         dvb_unregister_device (fepriv->dvbdev);
1113
1114         /* fe is invalid now */
1115         kfree(fepriv);
1116         mutex_unlock(&frontend_mutex);
1117         return 0;
1118 }
1119 EXPORT_SYMBOL(dvb_unregister_frontend);
1120
1121 #ifdef CONFIG_DVB_CORE_ATTACH
1122 void dvb_frontend_detach(struct dvb_frontend* fe)
1123 {
1124         void *ptr;
1125
1126         if (fe->ops.release_sec) {
1127                 fe->ops.release_sec(fe);
1128                 symbol_put_addr(fe->ops.release_sec);
1129         }
1130         if (fe->ops.tuner_ops.release) {
1131                 fe->ops.tuner_ops.release(fe);
1132                 symbol_put_addr(fe->ops.tuner_ops.release);
1133         }
1134         ptr = (void*)fe->ops.release;
1135         if (ptr) {
1136                 fe->ops.release(fe);
1137                 symbol_put_addr(ptr);
1138         }
1139 }
1140 #else
1141 void dvb_frontend_detach(struct dvb_frontend* fe)
1142 {
1143         if (fe->ops.release_sec)
1144                 fe->ops.release_sec(fe);
1145         if (fe->ops.tuner_ops.release)
1146                 fe->ops.tuner_ops.release(fe);
1147         if (fe->ops.release)
1148                 fe->ops.release(fe);
1149 }
1150 #endif
1151 EXPORT_SYMBOL(dvb_frontend_detach);