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