drivers/media/dvb-core/dvb_frontend.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dvb_frontend.c: DVB frontend tuning interface/thread
   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
  13 /* Enables DVBv3 compatibility bits at the headers */
  14 #define __DVB_CORE__
  15
  16 #define pr_fmt(fmt) "dvb_frontend: " fmt
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/wait.h>
  22 #include <linux/slab.h>
  23 #include <linux/poll.h>
  24 #include <linux/semaphore.h>
  25 #include <linux/module.h>
  26 #include <linux/nospec.h>
  27 #include <linux/list.h>
  28 #include <linux/freezer.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/kthread.h>
  31 #include <linux/ktime.h>
  32 #include <linux/compat.h>
  33 #include <asm/processor.h>
  34
  35 #include <media/dvb_frontend.h>
  36 #include <media/dvbdev.h>
  37 #include <linux/dvb/version.h>
  38
  39 static int dvb_frontend_debug;
  40 static int dvb_shutdown_timeout;
  41 static int dvb_force_auto_inversion;
  42 static int dvb_override_tune_delay;
  43 static int dvb_powerdown_on_sleep = 1;
  44 static int dvb_mfe_wait_time = 5;
  45
  46 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  47 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  48 module_param(dvb_shutdown_timeout, int, 0644);
  49 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  50 module_param(dvb_force_auto_inversion, int, 0644);
  51 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  52 module_param(dvb_override_tune_delay, int, 0644);
  53 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  54 module_param(dvb_powerdown_on_sleep, int, 0644);
  55 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  56 module_param(dvb_mfe_wait_time, int, 0644);
  57 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  58
  59 #define dprintk(fmt, arg...) \
  60         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  61
  62 #define FESTATE_IDLE 1
  63 #define FESTATE_RETUNE 2
  64 #define FESTATE_TUNING_FAST 4
  65 #define FESTATE_TUNING_SLOW 8
  66 #define FESTATE_TUNED 16
  67 #define FESTATE_ZIGZAG_FAST 32
  68 #define FESTATE_ZIGZAG_SLOW 64
  69 #define FESTATE_DISEQC 128
  70 #define FESTATE_ERROR 256
  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 /*
  77  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  78  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  79  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  80  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  81  * FESTATE_TUNED. The frontend has successfully locked on.
  82  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  83  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  84  * FESTATE_DISEQC. A DISEQC command has just been issued.
  85  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  86  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  87  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  88  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  89  */
  90
  91 static DEFINE_MUTEX(frontend_mutex);
  92
  93 struct dvb_frontend_private {
  94         /* thread/frontend values */
  95         struct dvb_device *dvbdev;
  96         struct dvb_frontend_parameters parameters_out;
  97         struct dvb_fe_events events;
  98         struct semaphore sem;
  99         struct list_head list_head;
 100         wait_queue_head_t wait_queue;
 101         struct task_struct *thread;
 102         unsigned long release_jiffies;
 103         unsigned int wakeup;
 104         enum fe_status status;
 105         unsigned long tune_mode_flags;
 106         unsigned int delay;
 107         unsigned int reinitialise;
 108         int tone;
 109         int voltage;
 110
 111         /* swzigzag values */
 112         unsigned int state;
 113         unsigned int bending;
 114         int lnb_drift;
 115         unsigned int inversion;
 116         unsigned int auto_step;
 117         unsigned int auto_sub_step;
 118         unsigned int started_auto_step;
 119         unsigned int min_delay;
 120         unsigned int max_drift;
 121         unsigned int step_size;
 122         int quality;
 123         unsigned int check_wrapped;
 124         enum dvbfe_search algo_status;
 125
 126 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 127         struct media_pipeline pipe;
 128 #endif
 129 };
 130
 131 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 132                                         void (*release)(struct dvb_frontend *fe));
 133
 134 static void __dvb_frontend_free(struct dvb_frontend *fe)
 135 {
 136         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 137
 138         if (fepriv)
 139                 dvb_device_put(fepriv->dvbdev);
 140
 141         dvb_frontend_invoke_release(fe, fe->ops.release);
 142
 143         kfree(fepriv);
 144 }
 145
 146 static void dvb_frontend_free(struct kref *ref)
 147 {
 148         struct dvb_frontend *fe =
 149                 container_of(ref, struct dvb_frontend, refcount);
 150
 151         __dvb_frontend_free(fe);
 152 }
 153
 154 static void dvb_frontend_put(struct dvb_frontend *fe)
 155 {
 156         /* call detach before dropping the reference count */
 157         if (fe->ops.detach)
 158                 fe->ops.detach(fe);
 159         /*
 160          * Check if the frontend was registered, as otherwise
 161          * kref was not initialized yet.
 162          */
 163         if (fe->frontend_priv)
 164                 kref_put(&fe->refcount, dvb_frontend_free);
 165         else
 166                 __dvb_frontend_free(fe);
 167 }
 168
 169 static void dvb_frontend_get(struct dvb_frontend *fe)
 170 {
 171         kref_get(&fe->refcount);
 172 }
 173
 174 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 175 static int dtv_get_frontend(struct dvb_frontend *fe,
 176                             struct dtv_frontend_properties *c,
 177                             struct dvb_frontend_parameters *p_out);
 178 static int
 179 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 180                                 const struct dtv_frontend_properties *c,
 181                                 struct dvb_frontend_parameters *p);
 182
 183 static bool has_get_frontend(struct dvb_frontend *fe)
 184 {
 185         return fe->ops.get_frontend;
 186 }
 187
 188 /*
 189  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 190  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 191  * otherwise, a DVBv3 call will fail.
 192  */
 193 enum dvbv3_emulation_type {
 194         DVBV3_UNKNOWN,
 195         DVBV3_QPSK,
 196         DVBV3_QAM,
 197         DVBV3_OFDM,
 198         DVBV3_ATSC,
 199 };
 200
 201 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 202 {
 203         switch (delivery_system) {
 204         case SYS_DVBC_ANNEX_A:
 205         case SYS_DVBC_ANNEX_C:
 206                 return DVBV3_QAM;
 207         case SYS_DVBS:
 208         case SYS_DVBS2:
 209         case SYS_TURBO:
 210         case SYS_ISDBS:
 211         case SYS_DSS:
 212                 return DVBV3_QPSK;
 213         case SYS_DVBT:
 214         case SYS_DVBT2:
 215         case SYS_ISDBT:
 216         case SYS_DTMB:
 217                 return DVBV3_OFDM;
 218         case SYS_ATSC:
 219         case SYS_ATSCMH:
 220         case SYS_DVBC_ANNEX_B:
 221                 return DVBV3_ATSC;
 222         case SYS_UNDEFINED:
 223         case SYS_ISDBC:
 224         case SYS_DVBH:
 225         case SYS_DAB:
 226         default:
 227                 /*
 228                  * Doesn't know how to emulate those types and/or
 229                  * there's no frontend driver from this type yet
 230                  * with some emulation code, so, we're not sure yet how
 231                  * to handle them, or they're not compatible with a DVBv3 call.
 232                  */
 233                 return DVBV3_UNKNOWN;
 234         }
 235 }
 236
 237 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 238                                    enum fe_status status)
 239 {
 240         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 241         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 242         struct dvb_fe_events *events = &fepriv->events;
 243         struct dvb_frontend_event *e;
 244         int wp;
 245
 246         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 247
 248         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 249                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 250
 251         mutex_lock(&events->mtx);
 252
 253         wp = (events->eventw + 1) % MAX_EVENT;
 254         if (wp == events->eventr) {
 255                 events->overflow = 1;
 256                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 257         }
 258
 259         e = &events->events[events->eventw];
 260         e->status = status;
 261         e->parameters = fepriv->parameters_out;
 262
 263         events->eventw = wp;
 264
 265         mutex_unlock(&events->mtx);
 266
 267         wake_up_interruptible(&events->wait_queue);
 268 }
 269
 270 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 271                                    struct dvb_fe_events *events)
 272 {
 273         int ret;
 274
 275         up(&fepriv->sem);
 276         ret = events->eventw != events->eventr;
 277         down(&fepriv->sem);
 278
 279         return ret;
 280 }
 281
 282 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 283                                   struct dvb_frontend_event *event, int flags)
 284 {
 285         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 286         struct dvb_fe_events *events = &fepriv->events;
 287
 288         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 289
 290         if (events->overflow) {
 291                 events->overflow = 0;
 292                 return -EOVERFLOW;
 293         }
 294
 295         if (events->eventw == events->eventr) {
 296                 struct wait_queue_entry wait;
 297                 int ret = 0;
 298
 299                 if (flags & O_NONBLOCK)
 300                         return -EWOULDBLOCK;
 301
 302                 init_waitqueue_entry(&wait, current);
 303                 add_wait_queue(&events->wait_queue, &wait);
 304                 while (!dvb_frontend_test_event(fepriv, events)) {
 305                         wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
 306                         if (signal_pending(current)) {
 307                                 ret = -ERESTARTSYS;
 308                                 break;
 309                         }
 310                 }
 311                 remove_wait_queue(&events->wait_queue, &wait);
 312                 if (ret < 0)
 313                         return ret;
 314         }
 315
 316         mutex_lock(&events->mtx);
 317         *event = events->events[events->eventr];
 318         events->eventr = (events->eventr + 1) % MAX_EVENT;
 319         mutex_unlock(&events->mtx);
 320
 321         return 0;
 322 }
 323
 324 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 325 {
 326         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 327         struct dvb_fe_events *events = &fepriv->events;
 328
 329         mutex_lock(&events->mtx);
 330         events->eventr = events->eventw;
 331         mutex_unlock(&events->mtx);
 332 }
 333
 334 static void dvb_frontend_init(struct dvb_frontend *fe)
 335 {
 336         dev_dbg(fe->dvb->device,
 337                 "%s: initialising adapter %i frontend %i (%s)...\n",
 338                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 339
 340         if (fe->ops.init)
 341                 fe->ops.init(fe);
 342         if (fe->ops.tuner_ops.init) {
 343                 if (fe->ops.i2c_gate_ctrl)
 344                         fe->ops.i2c_gate_ctrl(fe, 1);
 345                 fe->ops.tuner_ops.init(fe);
 346                 if (fe->ops.i2c_gate_ctrl)
 347                         fe->ops.i2c_gate_ctrl(fe, 0);
 348         }
 349 }
 350
 351 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 352 {
 353         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 354
 355         fepriv->reinitialise = 1;
 356         dvb_frontend_wakeup(fe);
 357 }
 358 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 359
 360 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 361 {
 362         int q2;
 363         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 364
 365         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 366
 367         if (locked)
 368                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 369         else
 370                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 371
 372         q2 = fepriv->quality - 128;
 373         q2 *= q2;
 374
 375         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 376 }
 377
 378 /**
 379  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 380  *      parameters.
 381  *
 382  * @fe: The frontend concerned.
 383  * @check_wrapped: Checks if an iteration has completed.
 384  *                 DO NOT SET ON THE FIRST ATTEMPT.
 385  *
 386  * return: Number of complete iterations that have been performed.
 387  */
 388 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 389 {
 390         int autoinversion;
 391         int ready = 0;
 392         int fe_set_err = 0;
 393         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 394         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 395         int original_inversion = c->inversion;
 396         u32 original_frequency = c->frequency;
 397
 398         /* are we using autoinversion? */
 399         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 400                          (c->inversion == INVERSION_AUTO));
 401
 402         /* setup parameters correctly */
 403         while (!ready) {
 404                 /* calculate the lnb_drift */
 405                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 406
 407                 /* wrap the auto_step if we've exceeded the maximum drift */
 408                 if (fepriv->lnb_drift > fepriv->max_drift) {
 409                         fepriv->auto_step = 0;
 410                         fepriv->auto_sub_step = 0;
 411                         fepriv->lnb_drift = 0;
 412                 }
 413
 414                 /* perform inversion and +/- zigzag */
 415                 switch (fepriv->auto_sub_step) {
 416                 case 0:
 417                         /* try with the current inversion and current drift setting */
 418                         ready = 1;
 419                         break;
 420
 421                 case 1:
 422                         if (!autoinversion) break;
 423
 424                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 425                         ready = 1;
 426                         break;
 427
 428                 case 2:
 429                         if (fepriv->lnb_drift == 0) break;
 430
 431                         fepriv->lnb_drift = -fepriv->lnb_drift;
 432                         ready = 1;
 433                         break;
 434
 435                 case 3:
 436                         if (fepriv->lnb_drift == 0) break;
 437                         if (!autoinversion) break;
 438
 439                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 440                         fepriv->lnb_drift = -fepriv->lnb_drift;
 441                         ready = 1;
 442                         break;
 443
 444                 default:
 445                         fepriv->auto_step++;
 446                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 447                         break;
 448                 }
 449
 450                 if (!ready) fepriv->auto_sub_step++;
 451         }
 452
 453         /* if this attempt would hit where we started, indicate a complete
 454          * iteration has occurred */
 455         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 456             (fepriv->auto_sub_step == 0) && check_wrapped) {
 457                 return 1;
 458         }
 459
 460         dev_dbg(fe->dvb->device,
 461                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 462                 __func__, fepriv->lnb_drift, fepriv->inversion,
 463                 fepriv->auto_step, fepriv->auto_sub_step,
 464                 fepriv->started_auto_step);
 465
 466         /* set the frontend itself */
 467         c->frequency += fepriv->lnb_drift;
 468         if (autoinversion)
 469                 c->inversion = fepriv->inversion;
 470         tmp = *c;
 471         if (fe->ops.set_frontend)
 472                 fe_set_err = fe->ops.set_frontend(fe);
 473         *c = tmp;
 474         if (fe_set_err < 0) {
 475                 fepriv->state = FESTATE_ERROR;
 476                 return fe_set_err;
 477         }
 478
 479         c->frequency = original_frequency;
 480         c->inversion = original_inversion;
 481
 482         fepriv->auto_sub_step++;
 483         return 0;
 484 }
 485
 486 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 487 {
 488         enum fe_status s = FE_NONE;
 489         int retval = 0;
 490         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 491         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 492
 493         if (fepriv->max_drift)
 494                 dev_warn_once(fe->dvb->device,
 495                               "Frontend requested software zigzag, but didn't set the frequency step size\n");
 496
 497         /* if we've got no parameters, just keep idling */
 498         if (fepriv->state & FESTATE_IDLE) {
 499                 fepriv->delay = 3 * HZ;
 500                 fepriv->quality = 0;
 501                 return;
 502         }
 503
 504         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 505         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 506                 if (fepriv->state & FESTATE_RETUNE) {
 507                         tmp = *c;
 508                         if (fe->ops.set_frontend)
 509                                 retval = fe->ops.set_frontend(fe);
 510                         *c = tmp;
 511                         if (retval < 0)
 512                                 fepriv->state = FESTATE_ERROR;
 513                         else
 514                                 fepriv->state = FESTATE_TUNED;
 515                 }
 516                 fepriv->delay = 3 * HZ;
 517                 fepriv->quality = 0;
 518                 return;
 519         }
 520
 521         /* get the frontend status */
 522         if (fepriv->state & FESTATE_RETUNE) {
 523                 s = 0;
 524         } else {
 525                 if (fe->ops.read_status)
 526                         fe->ops.read_status(fe, &s);
 527                 if (s != fepriv->status) {
 528                         dvb_frontend_add_event(fe, s);
 529                         fepriv->status = s;
 530                 }
 531         }
 532
 533         /* if we're not tuned, and we have a lock, move to the TUNED state */
 534         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 535                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 536                 fepriv->state = FESTATE_TUNED;
 537
 538                 /* if we're tuned, then we have determined the correct inversion */
 539                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 540                     (c->inversion == INVERSION_AUTO)) {
 541                         c->inversion = fepriv->inversion;
 542                 }
 543                 return;
 544         }
 545
 546         /* if we are tuned already, check we're still locked */
 547         if (fepriv->state & FESTATE_TUNED) {
 548                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 549
 550                 /* we're tuned, and the lock is still good... */
 551                 if (s & FE_HAS_LOCK) {
 552                         return;
 553                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 554                         fepriv->state = FESTATE_ZIGZAG_FAST;
 555                         fepriv->started_auto_step = fepriv->auto_step;
 556                         fepriv->check_wrapped = 0;
 557                 }
 558         }
 559
 560         /* don't actually do anything if we're in the LOSTLOCK state,
 561          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 562         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 563             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 564                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 565                 return;
 566         }
 567
 568         /* don't do anything if we're in the DISEQC state, since this
 569          * might be someone with a motorized dish controlled by DISEQC.
 570          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 571         if (fepriv->state & FESTATE_DISEQC) {
 572                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 573                 return;
 574         }
 575
 576         /* if we're in the RETUNE state, set everything up for a brand
 577          * new scan, keeping the current inversion setting, as the next
 578          * tune is _very_ likely to require the same */
 579         if (fepriv->state & FESTATE_RETUNE) {
 580                 fepriv->lnb_drift = 0;
 581                 fepriv->auto_step = 0;
 582                 fepriv->auto_sub_step = 0;
 583                 fepriv->started_auto_step = 0;
 584                 fepriv->check_wrapped = 0;
 585         }
 586
 587         /* fast zigzag. */
 588         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 589                 fepriv->delay = fepriv->min_delay;
 590
 591                 /* perform a tune */
 592                 retval = dvb_frontend_swzigzag_autotune(fe,
 593                                                         fepriv->check_wrapped);
 594                 if (retval < 0) {
 595                         return;
 596                 } else if (retval) {
 597                         /* OK, if we've run out of trials at the fast speed.
 598                          * Drop back to slow for the _next_ attempt */
 599                         fepriv->state = FESTATE_SEARCHING_SLOW;
 600                         fepriv->started_auto_step = fepriv->auto_step;
 601                         return;
 602                 }
 603                 fepriv->check_wrapped = 1;
 604
 605                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 606                  * This ensures we cannot return from an
 607                  * FE_SET_FRONTEND ioctl before the first frontend tune
 608                  * occurs */
 609                 if (fepriv->state & FESTATE_RETUNE) {
 610                         fepriv->state = FESTATE_TUNING_FAST;
 611                 }
 612         }
 613
 614         /* slow zigzag */
 615         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 616                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 617
 618                 /* Note: don't bother checking for wrapping; we stay in this
 619                  * state until we get a lock */
 620                 dvb_frontend_swzigzag_autotune(fe, 0);
 621         }
 622 }
 623
 624 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 625 {
 626         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 627
 628         if (fe->exit != DVB_FE_NO_EXIT)
 629                 return 1;
 630
 631         if (fepriv->dvbdev->writers == 1)
 632                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 633                                   dvb_shutdown_timeout * HZ))
 634                         return 1;
 635
 636         return 0;
 637 }
 638
 639 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 640 {
 641         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 642
 643         if (fepriv->wakeup) {
 644                 fepriv->wakeup = 0;
 645                 return 1;
 646         }
 647         return dvb_frontend_is_exiting(fe);
 648 }
 649
 650 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 651 {
 652         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 653
 654         fepriv->wakeup = 1;
 655         wake_up_interruptible(&fepriv->wait_queue);
 656 }
 657
 658 static int dvb_frontend_thread(void *data)
 659 {
 660         struct dvb_frontend *fe = data;
 661         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 662         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 663         enum fe_status s = FE_NONE;
 664         enum dvbfe_algo algo;
 665         bool re_tune = false;
 666         bool semheld = false;
 667
 668         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 669
 670         fepriv->check_wrapped = 0;
 671         fepriv->quality = 0;
 672         fepriv->delay = 3 * HZ;
 673         fepriv->status = 0;
 674         fepriv->wakeup = 0;
 675         fepriv->reinitialise = 0;
 676
 677         dvb_frontend_init(fe);
 678
 679         set_freezable();
 680         while (1) {
 681                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 682                 wait_event_freezable_timeout(fepriv->wait_queue,
 683                                              dvb_frontend_should_wakeup(fe) ||
 684                                              kthread_should_stop(),
 685                                              fepriv->delay);
 686
 687                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 688                         /* got signal or quitting */
 689                         if (!down_interruptible(&fepriv->sem))
 690                                 semheld = true;
 691                         fe->exit = DVB_FE_NORMAL_EXIT;
 692                         break;
 693                 }
 694
 695                 if (down_interruptible(&fepriv->sem))
 696                         break;
 697
 698                 if (fepriv->reinitialise) {
 699                         dvb_frontend_init(fe);
 700                         if (fe->ops.set_tone && fepriv->tone != -1)
 701                                 fe->ops.set_tone(fe, fepriv->tone);
 702                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 703                                 fe->ops.set_voltage(fe, fepriv->voltage);
 704                         fepriv->reinitialise = 0;
 705                 }
 706
 707                 /* do an iteration of the tuning loop */
 708                 if (fe->ops.get_frontend_algo) {
 709                         algo = fe->ops.get_frontend_algo(fe);
 710                         switch (algo) {
 711                         case DVBFE_ALGO_HW:
 712                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 713
 714                                 if (fepriv->state & FESTATE_RETUNE) {
 715                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 716                                         re_tune = true;
 717                                         fepriv->state = FESTATE_TUNED;
 718                                 } else {
 719                                         re_tune = false;
 720                                 }
 721
 722                                 if (fe->ops.tune)
 723                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 724
 725                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 726                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 727                                         dvb_frontend_add_event(fe, s);
 728                                         fepriv->status = s;
 729                                 }
 730                                 break;
 731                         case DVBFE_ALGO_SW:
 732                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 733                                 dvb_frontend_swzigzag(fe);
 734                                 break;
 735                         case DVBFE_ALGO_CUSTOM:
 736                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 737                                 if (fepriv->state & FESTATE_RETUNE) {
 738                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 739                                         fepriv->state = FESTATE_TUNED;
 740                                 }
 741                                 /* Case where we are going to search for a carrier
 742                                  * User asked us to retune again for some reason, possibly
 743                                  * requesting a search with a new set of parameters
 744                                  */
 745                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 746                                         if (fe->ops.search) {
 747                                                 fepriv->algo_status = fe->ops.search(fe);
 748                                                 /* We did do a search as was requested, the flags are
 749                                                  * now unset as well and has the flags wrt to search.
 750                                                  */
 751                                         } else {
 752                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 753                                         }
 754                                 }
 755                                 /* Track the carrier if the search was successful */
 756                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 757                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 758                                         fepriv->delay = HZ / 2;
 759                                 }
 760                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 761                                 fe->ops.read_status(fe, &s);
 762                                 if (s != fepriv->status) {
 763                                         dvb_frontend_add_event(fe, s); /* update event list */
 764                                         fepriv->status = s;
 765                                         if (!(s & FE_HAS_LOCK)) {
 766                                                 fepriv->delay = HZ / 10;
 767                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 768                                         } else {
 769                                                 fepriv->delay = 60 * HZ;
 770                                         }
 771                                 }
 772                                 break;
 773                         default:
 774                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 775                                 break;
 776                         }
 777                 } else {
 778                         dvb_frontend_swzigzag(fe);
 779                 }
 780         }
 781
 782         if (dvb_powerdown_on_sleep) {
 783                 if (fe->ops.set_voltage)
 784                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 785                 if (fe->ops.tuner_ops.sleep) {
 786                         if (fe->ops.i2c_gate_ctrl)
 787                                 fe->ops.i2c_gate_ctrl(fe, 1);
 788                         fe->ops.tuner_ops.sleep(fe);
 789                         if (fe->ops.i2c_gate_ctrl)
 790                                 fe->ops.i2c_gate_ctrl(fe, 0);
 791                 }
 792                 if (fe->ops.sleep)
 793                         fe->ops.sleep(fe);
 794         }
 795
 796         fepriv->thread = NULL;
 797         if (kthread_should_stop())
 798                 fe->exit = DVB_FE_DEVICE_REMOVED;
 799         else
 800                 fe->exit = DVB_FE_NO_EXIT;
 801         mb();
 802
 803         if (semheld)
 804                 up(&fepriv->sem);
 805         dvb_frontend_wakeup(fe);
 806         return 0;
 807 }
 808
 809 static void dvb_frontend_stop(struct dvb_frontend *fe)
 810 {
 811         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 812
 813         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 814
 815         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 816                 fe->exit = DVB_FE_NORMAL_EXIT;
 817         mb();
 818
 819         if (!fepriv->thread)
 820                 return;
 821
 822         kthread_stop(fepriv->thread);
 823
 824         sema_init(&fepriv->sem, 1);
 825         fepriv->state = FESTATE_IDLE;
 826
 827         /* paranoia check in case a signal arrived */
 828         if (fepriv->thread)
 829                 dev_warn(fe->dvb->device,
 830                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 831                          fepriv->thread);
 832 }
 833
 834 /*
 835  * Sleep for the amount of time given by add_usec parameter
 836  *
 837  * This needs to be as precise as possible, as it affects the detection of
 838  * the dish tone command at the satellite subsystem. The precision is improved
 839  * by using a scheduled msleep followed by udelay for the remainder.
 840  */
 841 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 842 {
 843         s32 delta;
 844
 845         *waketime = ktime_add_us(*waketime, add_usec);
 846         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 847         if (delta > 2500) {
 848                 msleep((delta - 1500) / 1000);
 849                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 850         }
 851         if (delta > 0)
 852                 udelay(delta);
 853 }
 854 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 855
 856 static int dvb_frontend_start(struct dvb_frontend *fe)
 857 {
 858         int ret;
 859         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 860         struct task_struct *fe_thread;
 861
 862         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 863
 864         if (fepriv->thread) {
 865                 if (fe->exit == DVB_FE_NO_EXIT)
 866                         return 0;
 867                 else
 868                         dvb_frontend_stop(fe);
 869         }
 870
 871         if (signal_pending(current))
 872                 return -EINTR;
 873         if (down_interruptible(&fepriv->sem))
 874                 return -EINTR;
 875
 876         fepriv->state = FESTATE_IDLE;
 877         fe->exit = DVB_FE_NO_EXIT;
 878         fepriv->thread = NULL;
 879         mb();
 880
 881         fe_thread = kthread_run(dvb_frontend_thread, fe,
 882                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 883         if (IS_ERR(fe_thread)) {
 884                 ret = PTR_ERR(fe_thread);
 885                 dev_warn(fe->dvb->device,
 886                          "dvb_frontend_start: failed to start kthread (%d)\n",
 887                          ret);
 888                 up(&fepriv->sem);
 889                 return ret;
 890         }
 891         fepriv->thread = fe_thread;
 892         return 0;
 893 }
 894
 895 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 896                                               u32 *freq_min, u32 *freq_max,
 897                                               u32 *tolerance)
 898 {
 899         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 900         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 901         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 902         u32 frontend_min = fe->ops.info.frequency_min_hz;
 903         u32 frontend_max = fe->ops.info.frequency_max_hz;
 904
 905         *freq_min = max(frontend_min, tuner_min);
 906
 907         if (frontend_max == 0)
 908                 *freq_max = tuner_max;
 909         else if (tuner_max == 0)
 910                 *freq_max = frontend_max;
 911         else
 912                 *freq_max = min(frontend_max, tuner_max);
 913
 914         if (*freq_min == 0 || *freq_max == 0)
 915                 dev_warn(fe->dvb->device,
 916                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 917                          fe->dvb->num, fe->id);
 918
 919         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 920                 tuner_min, tuner_max, frontend_min, frontend_max);
 921
 922         /* If the standard is for satellite, convert frequencies to kHz */
 923         switch (c->delivery_system) {
 924         case SYS_DSS:
 925         case SYS_DVBS:
 926         case SYS_DVBS2:
 927         case SYS_TURBO:
 928         case SYS_ISDBS:
 929                 *freq_min /= kHz;
 930                 *freq_max /= kHz;
 931                 if (tolerance)
 932                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 933
 934                 break;
 935         default:
 936                 if (tolerance)
 937                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 938                 break;
 939         }
 940 }
 941
 942 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 943 {
 944         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 945         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 946         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 947         u32 step = max(fe_step, tuner_step);
 948
 949         switch (c->delivery_system) {
 950         case SYS_DSS:
 951         case SYS_DVBS:
 952         case SYS_DVBS2:
 953         case SYS_TURBO:
 954         case SYS_ISDBS:
 955                 step /= kHz;
 956                 break;
 957         default:
 958                 break;
 959         }
 960
 961         return step;
 962 }
 963
 964 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 965 {
 966         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 967         u32 freq_min;
 968         u32 freq_max;
 969
 970         /* range check: frequency */
 971         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 972         if ((freq_min && c->frequency < freq_min) ||
 973             (freq_max && c->frequency > freq_max)) {
 974                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 975                          fe->dvb->num, fe->id, c->frequency,
 976                          freq_min, freq_max);
 977                 return -EINVAL;
 978         }
 979
 980         /* range check: symbol rate */
 981         switch (c->delivery_system) {
 982         case SYS_DSS:
 983         case SYS_DVBS:
 984         case SYS_DVBS2:
 985         case SYS_TURBO:
 986         case SYS_DVBC_ANNEX_A:
 987         case SYS_DVBC_ANNEX_C:
 988                 if ((fe->ops.info.symbol_rate_min &&
 989                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 990                     (fe->ops.info.symbol_rate_max &&
 991                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 992                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 993                                  fe->dvb->num, fe->id, c->symbol_rate,
 994                                  fe->ops.info.symbol_rate_min,
 995                                  fe->ops.info.symbol_rate_max);
 996                         return -EINVAL;
 997                 }
 998                 break;
 999         default:
1000                 break;
1001         }
1002
1003         return 0;
1004 }
1005
1006 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1007 {
1008         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1009         int i;
1010         u32 delsys;
1011
1012         delsys = c->delivery_system;
1013         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1014         c->delivery_system = delsys;
1015
1016         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1017                 __func__, c->delivery_system);
1018
1019         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1020         c->bandwidth_hz = 0;    /* AUTO */
1021         c->guard_interval = GUARD_INTERVAL_AUTO;
1022         c->hierarchy = HIERARCHY_AUTO;
1023         c->symbol_rate = 0;
1024         c->code_rate_HP = FEC_AUTO;
1025         c->code_rate_LP = FEC_AUTO;
1026         c->fec_inner = FEC_AUTO;
1027         c->rolloff = ROLLOFF_AUTO;
1028         c->voltage = SEC_VOLTAGE_OFF;
1029         c->sectone = SEC_TONE_OFF;
1030         c->pilot = PILOT_AUTO;
1031
1032         c->isdbt_partial_reception = 0;
1033         c->isdbt_sb_mode = 0;
1034         c->isdbt_sb_subchannel = 0;
1035         c->isdbt_sb_segment_idx = 0;
1036         c->isdbt_sb_segment_count = 0;
1037         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1038         for (i = 0; i < 3; i++) {
1039                 c->layer[i].fec = FEC_AUTO;
1040                 c->layer[i].modulation = QAM_AUTO;
1041                 c->layer[i].interleaving = 0;
1042                 c->layer[i].segment_count = 0;
1043         }
1044
1045         c->stream_id = NO_STREAM_ID_FILTER;
1046         c->scrambling_sequence_index = 0;/* default sequence */
1047
1048         switch (c->delivery_system) {
1049         case SYS_DSS:
1050                 c->modulation = QPSK;
1051                 c->rolloff = ROLLOFF_20;
1052                 break;
1053         case SYS_DVBS:
1054         case SYS_DVBS2:
1055         case SYS_TURBO:
1056                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1057                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1058                 break;
1059         case SYS_ATSC:
1060                 c->modulation = VSB_8;
1061                 break;
1062         case SYS_ISDBS:
1063                 c->symbol_rate = 28860000;
1064                 c->rolloff = ROLLOFF_35;
1065                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1066                 break;
1067         default:
1068                 c->modulation = QAM_AUTO;
1069                 break;
1070         }
1071
1072         c->lna = LNA_AUTO;
1073
1074         return 0;
1075 }
1076
1077 #define _DTV_CMD(n) \
1078         [n] =  #n
1079
1080 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1081         _DTV_CMD(DTV_TUNE),
1082         _DTV_CMD(DTV_CLEAR),
1083
1084         /* Set */
1085         _DTV_CMD(DTV_FREQUENCY),
1086         _DTV_CMD(DTV_BANDWIDTH_HZ),
1087         _DTV_CMD(DTV_MODULATION),
1088         _DTV_CMD(DTV_INVERSION),
1089         _DTV_CMD(DTV_DISEQC_MASTER),
1090         _DTV_CMD(DTV_SYMBOL_RATE),
1091         _DTV_CMD(DTV_INNER_FEC),
1092         _DTV_CMD(DTV_VOLTAGE),
1093         _DTV_CMD(DTV_TONE),
1094         _DTV_CMD(DTV_PILOT),
1095         _DTV_CMD(DTV_ROLLOFF),
1096         _DTV_CMD(DTV_DELIVERY_SYSTEM),
1097         _DTV_CMD(DTV_HIERARCHY),
1098         _DTV_CMD(DTV_CODE_RATE_HP),
1099         _DTV_CMD(DTV_CODE_RATE_LP),
1100         _DTV_CMD(DTV_GUARD_INTERVAL),
1101         _DTV_CMD(DTV_TRANSMISSION_MODE),
1102         _DTV_CMD(DTV_INTERLEAVING),
1103
1104         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1105         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1106         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1107         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1108         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1109         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1110         _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1111         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1112         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1113         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1114         _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1115         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1116         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1117         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1118         _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1119         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1120         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1121         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1122
1123         _DTV_CMD(DTV_STREAM_ID),
1124         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1125         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1126         _DTV_CMD(DTV_LNA),
1127
1128         /* Get */
1129         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1130         _DTV_CMD(DTV_API_VERSION),
1131
1132         _DTV_CMD(DTV_ENUM_DELSYS),
1133
1134         _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1135         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1136
1137         _DTV_CMD(DTV_ATSCMH_FIC_VER),
1138         _DTV_CMD(DTV_ATSCMH_NOG),
1139         _DTV_CMD(DTV_ATSCMH_TNOG),
1140         _DTV_CMD(DTV_ATSCMH_SGN),
1141         _DTV_CMD(DTV_ATSCMH_PRC),
1142         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1143         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1144         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1145         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1146         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1147         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1148         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1149         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1150
1151         /* Statistics API */
1152         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1153         _DTV_CMD(DTV_STAT_CNR),
1154         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1155         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1156         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1157         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1158         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1159         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1160 };
1161
1162 static char *dtv_cmd_name(u32 cmd)
1163 {
1164         cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1165         return dtv_cmds[cmd];
1166 }
1167
1168 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1169  * drivers can use a single set_frontend tuning function, regardless of whether
1170  * it's being used for the legacy or new API, reducing code and complexity.
1171  */
1172 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1173                                    struct dtv_frontend_properties *c,
1174                                    const struct dvb_frontend_parameters *p)
1175 {
1176         c->frequency = p->frequency;
1177         c->inversion = p->inversion;
1178
1179         switch (dvbv3_type(c->delivery_system)) {
1180         case DVBV3_QPSK:
1181                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1182                 c->symbol_rate = p->u.qpsk.symbol_rate;
1183                 c->fec_inner = p->u.qpsk.fec_inner;
1184                 break;
1185         case DVBV3_QAM:
1186                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1187                 c->symbol_rate = p->u.qam.symbol_rate;
1188                 c->fec_inner = p->u.qam.fec_inner;
1189                 c->modulation = p->u.qam.modulation;
1190                 break;
1191         case DVBV3_OFDM:
1192                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1193
1194                 switch (p->u.ofdm.bandwidth) {
1195                 case BANDWIDTH_10_MHZ:
1196                         c->bandwidth_hz = 10000000;
1197                         break;
1198                 case BANDWIDTH_8_MHZ:
1199                         c->bandwidth_hz = 8000000;
1200                         break;
1201                 case BANDWIDTH_7_MHZ:
1202                         c->bandwidth_hz = 7000000;
1203                         break;
1204                 case BANDWIDTH_6_MHZ:
1205                         c->bandwidth_hz = 6000000;
1206                         break;
1207                 case BANDWIDTH_5_MHZ:
1208                         c->bandwidth_hz = 5000000;
1209                         break;
1210                 case BANDWIDTH_1_712_MHZ:
1211                         c->bandwidth_hz = 1712000;
1212                         break;
1213                 case BANDWIDTH_AUTO:
1214                         c->bandwidth_hz = 0;
1215                 }
1216
1217                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1218                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1219                 c->modulation = p->u.ofdm.constellation;
1220                 c->transmission_mode = p->u.ofdm.transmission_mode;
1221                 c->guard_interval = p->u.ofdm.guard_interval;
1222                 c->hierarchy = p->u.ofdm.hierarchy_information;
1223                 break;
1224         case DVBV3_ATSC:
1225                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1226                 c->modulation = p->u.vsb.modulation;
1227                 if (c->delivery_system == SYS_ATSCMH)
1228                         break;
1229                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1230                         c->delivery_system = SYS_ATSC;
1231                 else
1232                         c->delivery_system = SYS_DVBC_ANNEX_B;
1233                 break;
1234         case DVBV3_UNKNOWN:
1235                 dev_err(fe->dvb->device,
1236                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1237                         __func__, c->delivery_system);
1238                 return -EINVAL;
1239         }
1240
1241         return 0;
1242 }
1243
1244 /* Ensure the cached values are set correctly in the frontend
1245  * legacy tuning structures, for the advanced tuning API.
1246  */
1247 static int
1248 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1249                                 const struct dtv_frontend_properties *c,
1250                                 struct dvb_frontend_parameters *p)
1251 {
1252         p->frequency = c->frequency;
1253         p->inversion = c->inversion;
1254
1255         switch (dvbv3_type(c->delivery_system)) {
1256         case DVBV3_UNKNOWN:
1257                 dev_err(fe->dvb->device,
1258                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1259                         __func__, c->delivery_system);
1260                 return -EINVAL;
1261         case DVBV3_QPSK:
1262                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1263                 p->u.qpsk.symbol_rate = c->symbol_rate;
1264                 p->u.qpsk.fec_inner = c->fec_inner;
1265                 break;
1266         case DVBV3_QAM:
1267                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1268                 p->u.qam.symbol_rate = c->symbol_rate;
1269                 p->u.qam.fec_inner = c->fec_inner;
1270                 p->u.qam.modulation = c->modulation;
1271                 break;
1272         case DVBV3_OFDM:
1273                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1274                 switch (c->bandwidth_hz) {
1275                 case 10000000:
1276                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1277                         break;
1278                 case 8000000:
1279                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1280                         break;
1281                 case 7000000:
1282                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1283                         break;
1284                 case 6000000:
1285                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1286                         break;
1287                 case 5000000:
1288                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1289                         break;
1290                 case 1712000:
1291                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1292                         break;
1293                 case 0:
1294                 default:
1295                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1296                 }
1297                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1298                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1299                 p->u.ofdm.constellation = c->modulation;
1300                 p->u.ofdm.transmission_mode = c->transmission_mode;
1301                 p->u.ofdm.guard_interval = c->guard_interval;
1302                 p->u.ofdm.hierarchy_information = c->hierarchy;
1303                 break;
1304         case DVBV3_ATSC:
1305                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1306                 p->u.vsb.modulation = c->modulation;
1307                 break;
1308         }
1309         return 0;
1310 }
1311
1312 /**
1313  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1314  * @fe:         struct dvb_frontend pointer
1315  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1316  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1317  *
1318  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1319  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1320  * If p_out is not null, it will update the DVBv3 params pointed by it.
1321  */
1322 static int dtv_get_frontend(struct dvb_frontend *fe,
1323                             struct dtv_frontend_properties *c,
1324                             struct dvb_frontend_parameters *p_out)
1325 {
1326         int r;
1327
1328         if (fe->ops.get_frontend) {
1329                 r = fe->ops.get_frontend(fe, c);
1330                 if (unlikely(r < 0))
1331                         return r;
1332                 if (p_out)
1333                         dtv_property_legacy_params_sync(fe, c, p_out);
1334                 return 0;
1335         }
1336
1337         /* As everything is in cache, get_frontend fops are always supported */
1338         return 0;
1339 }
1340
1341 static int dvb_frontend_handle_ioctl(struct file *file,
1342                                      unsigned int cmd, void *parg);
1343
1344 static int dtv_property_process_get(struct dvb_frontend *fe,
1345                                     const struct dtv_frontend_properties *c,
1346                                     struct dtv_property *tvp,
1347                                     struct file *file)
1348 {
1349         int ncaps;
1350         unsigned int len = 1;
1351
1352         switch (tvp->cmd) {
1353         case DTV_ENUM_DELSYS:
1354                 ncaps = 0;
1355                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1356                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1357                         ncaps++;
1358                 }
1359                 tvp->u.buffer.len = ncaps;
1360                 len = ncaps;
1361                 break;
1362         case DTV_FREQUENCY:
1363                 tvp->u.data = c->frequency;
1364                 break;
1365         case DTV_MODULATION:
1366                 tvp->u.data = c->modulation;
1367                 break;
1368         case DTV_BANDWIDTH_HZ:
1369                 tvp->u.data = c->bandwidth_hz;
1370                 break;
1371         case DTV_INVERSION:
1372                 tvp->u.data = c->inversion;
1373                 break;
1374         case DTV_SYMBOL_RATE:
1375                 tvp->u.data = c->symbol_rate;
1376                 break;
1377         case DTV_INNER_FEC:
1378                 tvp->u.data = c->fec_inner;
1379                 break;
1380         case DTV_PILOT:
1381                 tvp->u.data = c->pilot;
1382                 break;
1383         case DTV_ROLLOFF:
1384                 tvp->u.data = c->rolloff;
1385                 break;
1386         case DTV_DELIVERY_SYSTEM:
1387                 tvp->u.data = c->delivery_system;
1388                 break;
1389         case DTV_VOLTAGE:
1390                 tvp->u.data = c->voltage;
1391                 break;
1392         case DTV_TONE:
1393                 tvp->u.data = c->sectone;
1394                 break;
1395         case DTV_API_VERSION:
1396                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1397                 break;
1398         case DTV_CODE_RATE_HP:
1399                 tvp->u.data = c->code_rate_HP;
1400                 break;
1401         case DTV_CODE_RATE_LP:
1402                 tvp->u.data = c->code_rate_LP;
1403                 break;
1404         case DTV_GUARD_INTERVAL:
1405                 tvp->u.data = c->guard_interval;
1406                 break;
1407         case DTV_TRANSMISSION_MODE:
1408                 tvp->u.data = c->transmission_mode;
1409                 break;
1410         case DTV_HIERARCHY:
1411                 tvp->u.data = c->hierarchy;
1412                 break;
1413         case DTV_INTERLEAVING:
1414                 tvp->u.data = c->interleaving;
1415                 break;
1416
1417         /* ISDB-T Support here */
1418         case DTV_ISDBT_PARTIAL_RECEPTION:
1419                 tvp->u.data = c->isdbt_partial_reception;
1420                 break;
1421         case DTV_ISDBT_SOUND_BROADCASTING:
1422                 tvp->u.data = c->isdbt_sb_mode;
1423                 break;
1424         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1425                 tvp->u.data = c->isdbt_sb_subchannel;
1426                 break;
1427         case DTV_ISDBT_SB_SEGMENT_IDX:
1428                 tvp->u.data = c->isdbt_sb_segment_idx;
1429                 break;
1430         case DTV_ISDBT_SB_SEGMENT_COUNT:
1431                 tvp->u.data = c->isdbt_sb_segment_count;
1432                 break;
1433         case DTV_ISDBT_LAYER_ENABLED:
1434                 tvp->u.data = c->isdbt_layer_enabled;
1435                 break;
1436         case DTV_ISDBT_LAYERA_FEC:
1437                 tvp->u.data = c->layer[0].fec;
1438                 break;
1439         case DTV_ISDBT_LAYERA_MODULATION:
1440                 tvp->u.data = c->layer[0].modulation;
1441                 break;
1442         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1443                 tvp->u.data = c->layer[0].segment_count;
1444                 break;
1445         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1446                 tvp->u.data = c->layer[0].interleaving;
1447                 break;
1448         case DTV_ISDBT_LAYERB_FEC:
1449                 tvp->u.data = c->layer[1].fec;
1450                 break;
1451         case DTV_ISDBT_LAYERB_MODULATION:
1452                 tvp->u.data = c->layer[1].modulation;
1453                 break;
1454         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1455                 tvp->u.data = c->layer[1].segment_count;
1456                 break;
1457         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1458                 tvp->u.data = c->layer[1].interleaving;
1459                 break;
1460         case DTV_ISDBT_LAYERC_FEC:
1461                 tvp->u.data = c->layer[2].fec;
1462                 break;
1463         case DTV_ISDBT_LAYERC_MODULATION:
1464                 tvp->u.data = c->layer[2].modulation;
1465                 break;
1466         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1467                 tvp->u.data = c->layer[2].segment_count;
1468                 break;
1469         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1470                 tvp->u.data = c->layer[2].interleaving;
1471                 break;
1472
1473         /* Multistream support */
1474         case DTV_STREAM_ID:
1475         case DTV_DVBT2_PLP_ID_LEGACY:
1476                 tvp->u.data = c->stream_id;
1477                 break;
1478
1479         /* Physical layer scrambling support */
1480         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1481                 tvp->u.data = c->scrambling_sequence_index;
1482                 break;
1483
1484         /* ATSC-MH */
1485         case DTV_ATSCMH_FIC_VER:
1486                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1487                 break;
1488         case DTV_ATSCMH_PARADE_ID:
1489                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1490                 break;
1491         case DTV_ATSCMH_NOG:
1492                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1493                 break;
1494         case DTV_ATSCMH_TNOG:
1495                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1496                 break;
1497         case DTV_ATSCMH_SGN:
1498                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1499                 break;
1500         case DTV_ATSCMH_PRC:
1501                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1502                 break;
1503         case DTV_ATSCMH_RS_FRAME_MODE:
1504                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1505                 break;
1506         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1507                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1508                 break;
1509         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1510                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1511                 break;
1512         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1513                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1514                 break;
1515         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1516                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1517                 break;
1518         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1519                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1520                 break;
1521         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1522                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1523                 break;
1524         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1525                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1526                 break;
1527         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1528                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1529                 break;
1530
1531         case DTV_LNA:
1532                 tvp->u.data = c->lna;
1533                 break;
1534
1535         /* Fill quality measures */
1536         case DTV_STAT_SIGNAL_STRENGTH:
1537                 tvp->u.st = c->strength;
1538                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1539                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1540                 len = tvp->u.buffer.len;
1541                 break;
1542         case DTV_STAT_CNR:
1543                 tvp->u.st = c->cnr;
1544                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1545                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1546                 len = tvp->u.buffer.len;
1547                 break;
1548         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1549                 tvp->u.st = c->pre_bit_error;
1550                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1551                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1552                 len = tvp->u.buffer.len;
1553                 break;
1554         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1555                 tvp->u.st = c->pre_bit_count;
1556                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1557                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1558                 len = tvp->u.buffer.len;
1559                 break;
1560         case DTV_STAT_POST_ERROR_BIT_COUNT:
1561                 tvp->u.st = c->post_bit_error;
1562                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1563                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1564                 len = tvp->u.buffer.len;
1565                 break;
1566         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1567                 tvp->u.st = c->post_bit_count;
1568                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1569                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1570                 len = tvp->u.buffer.len;
1571                 break;
1572         case DTV_STAT_ERROR_BLOCK_COUNT:
1573                 tvp->u.st = c->block_error;
1574                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1575                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1576                 len = tvp->u.buffer.len;
1577                 break;
1578         case DTV_STAT_TOTAL_BLOCK_COUNT:
1579                 tvp->u.st = c->block_count;
1580                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1581                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1582                 len = tvp->u.buffer.len;
1583                 break;
1584         default:
1585                 dev_dbg(fe->dvb->device,
1586                         "%s: FE property %d doesn't exist\n",
1587                         __func__, tvp->cmd);
1588                 return -EINVAL;
1589         }
1590
1591         if (len < 1)
1592                 len = 1;
1593
1594         dev_dbg(fe->dvb->device,
1595                 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1596                 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1597                 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1598
1599         return 0;
1600 }
1601
1602 static int dtv_set_frontend(struct dvb_frontend *fe);
1603
1604 static bool is_dvbv3_delsys(u32 delsys)
1605 {
1606         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1607                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1608 }
1609
1610 /**
1611  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1612  * @fe:                 struct frontend;
1613  * @delsys:                     DVBv5 type that will be used for emulation
1614  *
1615  * Provides emulation for delivery systems that are compatible with the old
1616  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1617  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1618  * parameters are compatible with DVB-S spec.
1619  */
1620 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1621 {
1622         int i;
1623         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1624
1625         c->delivery_system = delsys;
1626
1627         /*
1628          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1629          */
1630         if (c->delivery_system == SYS_ISDBT) {
1631                 dev_dbg(fe->dvb->device,
1632                         "%s: Using defaults for SYS_ISDBT\n",
1633                         __func__);
1634
1635                 if (!c->bandwidth_hz)
1636                         c->bandwidth_hz = 6000000;
1637
1638                 c->isdbt_partial_reception = 0;
1639                 c->isdbt_sb_mode = 0;
1640                 c->isdbt_sb_subchannel = 0;
1641                 c->isdbt_sb_segment_idx = 0;
1642                 c->isdbt_sb_segment_count = 0;
1643                 c->isdbt_layer_enabled = 7;
1644                 for (i = 0; i < 3; i++) {
1645                         c->layer[i].fec = FEC_AUTO;
1646                         c->layer[i].modulation = QAM_AUTO;
1647                         c->layer[i].interleaving = 0;
1648                         c->layer[i].segment_count = 0;
1649                 }
1650         }
1651         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1652                 __func__, c->delivery_system);
1653
1654         return 0;
1655 }
1656
1657 /**
1658  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1659  * @fe:                 frontend struct
1660  * @desired_system:     delivery system requested by the user
1661  *
1662  * A DVBv5 call know what's the desired system it wants. So, set it.
1663  *
1664  * There are, however, a few known issues with early DVBv5 applications that
1665  * are also handled by this logic:
1666  *
1667  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1668  *    This is an API violation, but, as we don't want to break userspace,
1669  *    convert it to the first supported delivery system.
1670  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1671  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1672  *    ISDB-T provided backward compat with DVB-T.
1673  */
1674 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1675                                      u32 desired_system)
1676 {
1677         int ncaps;
1678         u32 delsys = SYS_UNDEFINED;
1679         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1680         enum dvbv3_emulation_type type;
1681
1682         /*
1683          * It was reported that some old DVBv5 applications were
1684          * filling delivery_system with SYS_UNDEFINED. If this happens,
1685          * assume that the application wants to use the first supported
1686          * delivery system.
1687          */
1688         if (desired_system == SYS_UNDEFINED)
1689                 desired_system = fe->ops.delsys[0];
1690
1691         /*
1692          * This is a DVBv5 call. So, it likely knows the supported
1693          * delivery systems. So, check if the desired delivery system is
1694          * supported
1695          */
1696         ncaps = 0;
1697         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1698                 if (fe->ops.delsys[ncaps] == desired_system) {
1699                         c->delivery_system = desired_system;
1700                         dev_dbg(fe->dvb->device,
1701                                 "%s: Changing delivery system to %d\n",
1702                                 __func__, desired_system);
1703                         return 0;
1704                 }
1705                 ncaps++;
1706         }
1707
1708         /*
1709          * The requested delivery system isn't supported. Maybe userspace
1710          * is requesting a DVBv3 compatible delivery system.
1711          *
1712          * The emulation only works if the desired system is one of the
1713          * delivery systems supported by DVBv3 API
1714          */
1715         if (!is_dvbv3_delsys(desired_system)) {
1716                 dev_dbg(fe->dvb->device,
1717                         "%s: Delivery system %d not supported.\n",
1718                         __func__, desired_system);
1719                 return -EINVAL;
1720         }
1721
1722         type = dvbv3_type(desired_system);
1723
1724         /*
1725         * Get the last non-DVBv3 delivery system that has the same type
1726         * of the desired system
1727         */
1728         ncaps = 0;
1729         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1730                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1731                         delsys = fe->ops.delsys[ncaps];
1732                 ncaps++;
1733         }
1734
1735         /* There's nothing compatible with the desired delivery system */
1736         if (delsys == SYS_UNDEFINED) {
1737                 dev_dbg(fe->dvb->device,
1738                         "%s: Delivery system %d not supported on emulation mode.\n",
1739                         __func__, desired_system);
1740                 return -EINVAL;
1741         }
1742
1743         dev_dbg(fe->dvb->device,
1744                 "%s: Using delivery system %d emulated as if it were %d\n",
1745                 __func__, delsys, desired_system);
1746
1747         return emulate_delivery_system(fe, desired_system);
1748 }
1749
1750 /**
1751  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1752  * @fe: frontend struct
1753  *
1754  * A DVBv3 call doesn't know what's the desired system it wants. It also
1755  * doesn't allow to switch between different types. Due to that, userspace
1756  * should use DVBv5 instead.
1757  * However, in order to avoid breaking userspace API, limited backward
1758  * compatibility support is provided.
1759  *
1760  * There are some delivery systems that are incompatible with DVBv3 calls.
1761  *
1762  * This routine should work fine for frontends that support just one delivery
1763  * system.
1764  *
1765  * For frontends that support multiple frontends:
1766  * 1) It defaults to use the first supported delivery system. There's an
1767  *    userspace application that allows changing it at runtime;
1768  *
1769  * 2) If the current delivery system is not compatible with DVBv3, it gets
1770  *    the first one that it is compatible.
1771  *
1772  * NOTE: in order for this to work with applications like Kaffeine that
1773  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1774  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1775  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1776  *      to DVB-S.
1777  */
1778 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1779 {
1780         int ncaps;
1781         u32 delsys = SYS_UNDEFINED;
1782         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1783
1784         /* If not set yet, defaults to the first supported delivery system */
1785         if (c->delivery_system == SYS_UNDEFINED)
1786                 c->delivery_system = fe->ops.delsys[0];
1787
1788         /*
1789          * Trivial case: just use the current one, if it already a DVBv3
1790          * delivery system
1791          */
1792         if (is_dvbv3_delsys(c->delivery_system)) {
1793                 dev_dbg(fe->dvb->device,
1794                         "%s: Using delivery system to %d\n",
1795                         __func__, c->delivery_system);
1796                 return 0;
1797         }
1798
1799         /*
1800          * Seek for the first delivery system that it is compatible with a
1801          * DVBv3 standard
1802          */
1803         ncaps = 0;
1804         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1805                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1806                         delsys = fe->ops.delsys[ncaps];
1807                         break;
1808                 }
1809                 ncaps++;
1810         }
1811         if (delsys == SYS_UNDEFINED) {
1812                 dev_dbg(fe->dvb->device,
1813                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1814                         __func__);
1815                 return -EINVAL;
1816         }
1817         return emulate_delivery_system(fe, delsys);
1818 }
1819
1820 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1821 {
1822         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1823         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1824         struct dvb_frontend_tune_settings fetunesettings = { 0 };
1825
1826         /* get frontend-specific tuning settings */
1827         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1828                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1829                 fepriv->max_drift = fetunesettings.max_drift;
1830                 fepriv->step_size = fetunesettings.step_size;
1831         } else {
1832                 /* default values */
1833                 switch (c->delivery_system) {
1834                 case SYS_DSS:
1835                 case SYS_DVBS:
1836                 case SYS_DVBS2:
1837                 case SYS_ISDBS:
1838                 case SYS_TURBO:
1839                 case SYS_DVBC_ANNEX_A:
1840                 case SYS_DVBC_ANNEX_C:
1841                         fepriv->min_delay = HZ / 20;
1842                         fepriv->step_size = c->symbol_rate / 16000;
1843                         fepriv->max_drift = c->symbol_rate / 2000;
1844                         break;
1845                 case SYS_DVBT:
1846                 case SYS_DVBT2:
1847                 case SYS_ISDBT:
1848                 case SYS_DTMB:
1849                         fepriv->min_delay = HZ / 20;
1850                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1851                         fepriv->max_drift = fepriv->step_size + 1;
1852                         break;
1853                 default:
1854                         /*
1855                          * FIXME: This sounds wrong! if freqency_stepsize is
1856                          * defined by the frontend, why not use it???
1857                          */
1858                         fepriv->min_delay = HZ / 20;
1859                         fepriv->step_size = 0; /* no zigzag */
1860                         fepriv->max_drift = 0;
1861                         break;
1862                 }
1863         }
1864         if (dvb_override_tune_delay > 0)
1865                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1866 }
1867
1868 /**
1869  * dtv_property_process_set -  Sets a single DTV property
1870  * @fe:         Pointer to &struct dvb_frontend
1871  * @file:       Pointer to &struct file
1872  * @cmd:        Digital TV command
1873  * @data:       An unsigned 32-bits number
1874  *
1875  * This routine assigns the property
1876  * value to the corresponding member of
1877  * &struct dtv_frontend_properties
1878  *
1879  * Returns:
1880  * Zero on success, negative errno on failure.
1881  */
1882 static int dtv_property_process_set(struct dvb_frontend *fe,
1883                                     struct file *file,
1884                                     u32 cmd, u32 data)
1885 {
1886         int r = 0;
1887         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1888
1889         /** Dump DTV command name and value*/
1890         if (!cmd || cmd > DTV_MAX_COMMAND)
1891                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1892                          __func__, cmd);
1893         else
1894                 dev_dbg(fe->dvb->device,
1895                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1896                         __func__, cmd, dtv_cmd_name(cmd), data);
1897         switch (cmd) {
1898         case DTV_CLEAR:
1899                 /*
1900                  * Reset a cache of data specific to the frontend here. This does
1901                  * not effect hardware.
1902                  */
1903                 dvb_frontend_clear_cache(fe);
1904                 break;
1905         case DTV_TUNE:
1906                 /*
1907                  * Use the cached Digital TV properties to tune the
1908                  * frontend
1909                  */
1910                 dev_dbg(fe->dvb->device,
1911                         "%s: Setting the frontend from property cache\n",
1912                         __func__);
1913
1914                 r = dtv_set_frontend(fe);
1915                 break;
1916         case DTV_FREQUENCY:
1917                 c->frequency = data;
1918                 break;
1919         case DTV_MODULATION:
1920                 c->modulation = data;
1921                 break;
1922         case DTV_BANDWIDTH_HZ:
1923                 c->bandwidth_hz = data;
1924                 break;
1925         case DTV_INVERSION:
1926                 c->inversion = data;
1927                 break;
1928         case DTV_SYMBOL_RATE:
1929                 c->symbol_rate = data;
1930                 break;
1931         case DTV_INNER_FEC:
1932                 c->fec_inner = data;
1933                 break;
1934         case DTV_PILOT:
1935                 c->pilot = data;
1936                 break;
1937         case DTV_ROLLOFF:
1938                 c->rolloff = data;
1939                 break;
1940         case DTV_DELIVERY_SYSTEM:
1941                 r = dvbv5_set_delivery_system(fe, data);
1942                 break;
1943         case DTV_VOLTAGE:
1944                 c->voltage = data;
1945                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1946                                               (void *)c->voltage);
1947                 break;
1948         case DTV_TONE:
1949                 c->sectone = data;
1950                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1951                                               (void *)c->sectone);
1952                 break;
1953         case DTV_CODE_RATE_HP:
1954                 c->code_rate_HP = data;
1955                 break;
1956         case DTV_CODE_RATE_LP:
1957                 c->code_rate_LP = data;
1958                 break;
1959         case DTV_GUARD_INTERVAL:
1960                 c->guard_interval = data;
1961                 break;
1962         case DTV_TRANSMISSION_MODE:
1963                 c->transmission_mode = data;
1964                 break;
1965         case DTV_HIERARCHY:
1966                 c->hierarchy = data;
1967                 break;
1968         case DTV_INTERLEAVING:
1969                 c->interleaving = data;
1970                 break;
1971
1972         /* ISDB-T Support here */
1973         case DTV_ISDBT_PARTIAL_RECEPTION:
1974                 c->isdbt_partial_reception = data;
1975                 break;
1976         case DTV_ISDBT_SOUND_BROADCASTING:
1977                 c->isdbt_sb_mode = data;
1978                 break;
1979         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1980                 c->isdbt_sb_subchannel = data;
1981                 break;
1982         case DTV_ISDBT_SB_SEGMENT_IDX:
1983                 c->isdbt_sb_segment_idx = data;
1984                 break;
1985         case DTV_ISDBT_SB_SEGMENT_COUNT:
1986                 c->isdbt_sb_segment_count = data;
1987                 break;
1988         case DTV_ISDBT_LAYER_ENABLED:
1989                 c->isdbt_layer_enabled = data;
1990                 break;
1991         case DTV_ISDBT_LAYERA_FEC:
1992                 c->layer[0].fec = data;
1993                 break;
1994         case DTV_ISDBT_LAYERA_MODULATION:
1995                 c->layer[0].modulation = data;
1996                 break;
1997         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1998                 c->layer[0].segment_count = data;
1999                 break;
2000         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
2001                 c->layer[0].interleaving = data;
2002                 break;
2003         case DTV_ISDBT_LAYERB_FEC:
2004                 c->layer[1].fec = data;
2005                 break;
2006         case DTV_ISDBT_LAYERB_MODULATION:
2007                 c->layer[1].modulation = data;
2008                 break;
2009         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2010                 c->layer[1].segment_count = data;
2011                 break;
2012         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2013                 c->layer[1].interleaving = data;
2014                 break;
2015         case DTV_ISDBT_LAYERC_FEC:
2016                 c->layer[2].fec = data;
2017                 break;
2018         case DTV_ISDBT_LAYERC_MODULATION:
2019                 c->layer[2].modulation = data;
2020                 break;
2021         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2022                 c->layer[2].segment_count = data;
2023                 break;
2024         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2025                 c->layer[2].interleaving = data;
2026                 break;
2027
2028         /* Multistream support */
2029         case DTV_STREAM_ID:
2030         case DTV_DVBT2_PLP_ID_LEGACY:
2031                 c->stream_id = data;
2032                 break;
2033
2034         /* Physical layer scrambling support */
2035         case DTV_SCRAMBLING_SEQUENCE_INDEX:
2036                 c->scrambling_sequence_index = data;
2037                 break;
2038
2039         /* ATSC-MH */
2040         case DTV_ATSCMH_PARADE_ID:
2041                 fe->dtv_property_cache.atscmh_parade_id = data;
2042                 break;
2043         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2044                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2045                 break;
2046
2047         case DTV_LNA:
2048                 c->lna = data;
2049                 if (fe->ops.set_lna)
2050                         r = fe->ops.set_lna(fe);
2051                 if (r < 0)
2052                         c->lna = LNA_AUTO;
2053                 break;
2054
2055         default:
2056                 return -EINVAL;
2057         }
2058
2059         return r;
2060 }
2061
2062 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2063                                  void *parg)
2064 {
2065         struct dvb_device *dvbdev = file->private_data;
2066         struct dvb_frontend *fe = dvbdev->priv;
2067         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2068         int err;
2069
2070         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2071         if (down_interruptible(&fepriv->sem))
2072                 return -ERESTARTSYS;
2073
2074         if (fe->exit != DVB_FE_NO_EXIT) {
2075                 up(&fepriv->sem);
2076                 return -ENODEV;
2077         }
2078
2079         /*
2080          * If the frontend is opened in read-only mode, only the ioctls
2081          * that don't interfere with the tune logic should be accepted.
2082          * That allows an external application to monitor the DVB QoS and
2083          * statistics parameters.
2084          *
2085          * That matches all _IOR() ioctls, except for two special cases:
2086          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2087          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2088          *     setup
2089          * So, those two ioctls should also return -EPERM, as otherwise
2090          * reading from them would interfere with a DVB tune application
2091          */
2092         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2093             && (_IOC_DIR(cmd) != _IOC_READ
2094                 || cmd == FE_GET_EVENT
2095                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2096                 up(&fepriv->sem);
2097                 return -EPERM;
2098         }
2099
2100         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2101
2102         up(&fepriv->sem);
2103         return err;
2104 }
2105
2106 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2107                                unsigned long arg)
2108 {
2109         struct dvb_device *dvbdev = file->private_data;
2110
2111         if (!dvbdev)
2112                 return -ENODEV;
2113
2114         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2115 }
2116
2117 #ifdef CONFIG_COMPAT
2118 struct compat_dtv_property {
2119         __u32 cmd;
2120         __u32 reserved[3];
2121         union {
2122                 __u32 data;
2123                 struct dtv_fe_stats st;
2124                 struct {
2125                         __u8 data[32];
2126                         __u32 len;
2127                         __u32 reserved1[3];
2128                         compat_uptr_t reserved2;
2129                 } buffer;
2130         } u;
2131         int result;
2132 } __attribute__ ((packed));
2133
2134 struct compat_dtv_properties {
2135         __u32 num;
2136         compat_uptr_t props;
2137 };
2138
2139 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2140 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2141
2142 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2143                                             unsigned long arg)
2144 {
2145         struct dvb_device *dvbdev = file->private_data;
2146         struct dvb_frontend *fe = dvbdev->priv;
2147         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2148         int i, err = 0;
2149
2150         if (cmd == COMPAT_FE_SET_PROPERTY) {
2151                 struct compat_dtv_properties prop, *tvps = NULL;
2152                 struct compat_dtv_property *tvp = NULL;
2153
2154                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2155                         return -EFAULT;
2156
2157                 tvps = &prop;
2158
2159                 /*
2160                  * Put an arbitrary limit on the number of messages that can
2161                  * be sent at once
2162                  */
2163                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2164                         return -EINVAL;
2165
2166                 tvp = memdup_array_user(compat_ptr(tvps->props),
2167                                         tvps->num, sizeof(*tvp));
2168                 if (IS_ERR(tvp))
2169                         return PTR_ERR(tvp);
2170
2171                 for (i = 0; i < tvps->num; i++) {
2172                         err = dtv_property_process_set(fe, file,
2173                                                        (tvp + i)->cmd,
2174                                                        (tvp + i)->u.data);
2175                         if (err < 0) {
2176                                 kfree(tvp);
2177                                 return err;
2178                         }
2179                 }
2180                 kfree(tvp);
2181         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2182                 struct compat_dtv_properties prop, *tvps = NULL;
2183                 struct compat_dtv_property *tvp = NULL;
2184                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2185
2186                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2187                         return -EFAULT;
2188
2189                 tvps = &prop;
2190
2191                 /*
2192                  * Put an arbitrary limit on the number of messages that can
2193                  * be sent at once
2194                  */
2195                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2196                         return -EINVAL;
2197
2198                 tvp = memdup_array_user(compat_ptr(tvps->props),
2199                                         tvps->num, sizeof(*tvp));
2200                 if (IS_ERR(tvp))
2201                         return PTR_ERR(tvp);
2202
2203                 /*
2204                  * Let's use our own copy of property cache, in order to
2205                  * avoid mangling with DTV zigzag logic, as drivers might
2206                  * return crap, if they don't check if the data is available
2207                  * before updating the properties cache.
2208                  */
2209                 if (fepriv->state != FESTATE_IDLE) {
2210                         err = dtv_get_frontend(fe, &getp, NULL);
2211                         if (err < 0) {
2212                                 kfree(tvp);
2213                                 return err;
2214                         }
2215                 }
2216                 for (i = 0; i < tvps->num; i++) {
2217                         err = dtv_property_process_get(
2218                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2219                         if (err < 0) {
2220                                 kfree(tvp);
2221                                 return err;
2222                         }
2223                 }
2224
2225                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2226                                  tvps->num * sizeof(struct compat_dtv_property))) {
2227                         kfree(tvp);
2228                         return -EFAULT;
2229                 }
2230                 kfree(tvp);
2231         }
2232
2233         return err;
2234 }
2235
2236 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2237                                       unsigned long arg)
2238 {
2239         struct dvb_device *dvbdev = file->private_data;
2240         struct dvb_frontend *fe = dvbdev->priv;
2241         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2242         int err;
2243
2244         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2245                 if (down_interruptible(&fepriv->sem))
2246                         return -ERESTARTSYS;
2247
2248                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2249
2250                 up(&fepriv->sem);
2251                 return err;
2252         }
2253
2254         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2255 }
2256 #endif
2257
2258 static int dtv_set_frontend(struct dvb_frontend *fe)
2259 {
2260         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2261         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2262         u32 rolloff = 0;
2263
2264         if (dvb_frontend_check_parameters(fe) < 0)
2265                 return -EINVAL;
2266
2267         /*
2268          * Initialize output parameters to match the values given by
2269          * the user. FE_SET_FRONTEND triggers an initial frontend event
2270          * with status = 0, which copies output parameters to userspace.
2271          */
2272         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2273
2274         /*
2275          * Be sure that the bandwidth will be filled for all
2276          * non-satellite systems, as tuners need to know what
2277          * low pass/Nyquist half filter should be applied, in
2278          * order to avoid inter-channel noise.
2279          *
2280          * ISDB-T and DVB-T/T2 already sets bandwidth.
2281          * ATSC and DVB-C don't set, so, the core should fill it.
2282          *
2283          * On DVB-C Annex A and C, the bandwidth is a function of
2284          * the roll-off and symbol rate. Annex B defines different
2285          * roll-off factors depending on the modulation. Fortunately,
2286          * Annex B is only used with 6MHz, so there's no need to
2287          * calculate it.
2288          *
2289          * While not officially supported, a side effect of handling it at
2290          * the cache level is that a program could retrieve the bandwidth
2291          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2292          */
2293         switch (c->delivery_system) {
2294         case SYS_ATSC:
2295         case SYS_DVBC_ANNEX_B:
2296                 c->bandwidth_hz = 6000000;
2297                 break;
2298         case SYS_DVBC_ANNEX_A:
2299                 rolloff = 115;
2300                 break;
2301         case SYS_DVBC_ANNEX_C:
2302                 rolloff = 113;
2303                 break;
2304         case SYS_DSS:
2305                 rolloff = 120;
2306                 break;
2307         case SYS_DVBS:
2308         case SYS_TURBO:
2309         case SYS_ISDBS:
2310                 rolloff = 135;
2311                 break;
2312         case SYS_DVBS2:
2313                 switch (c->rolloff) {
2314                 case ROLLOFF_20:
2315                         rolloff = 120;
2316                         break;
2317                 case ROLLOFF_25:
2318                         rolloff = 125;
2319                         break;
2320                 default:
2321                 case ROLLOFF_35:
2322                         rolloff = 135;
2323                 }
2324                 break;
2325         default:
2326                 break;
2327         }
2328         if (rolloff)
2329                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2330
2331         /* force auto frequency inversion if requested */
2332         if (dvb_force_auto_inversion)
2333                 c->inversion = INVERSION_AUTO;
2334
2335         /*
2336          * without hierarchical coding code_rate_LP is irrelevant,
2337          * so we tolerate the otherwise invalid FEC_NONE setting
2338          */
2339         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2340                 c->code_rate_LP = FEC_AUTO;
2341
2342         prepare_tuning_algo_parameters(fe);
2343
2344         fepriv->state = FESTATE_RETUNE;
2345
2346         /* Request the search algorithm to search */
2347         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2348
2349         dvb_frontend_clear_events(fe);
2350         dvb_frontend_add_event(fe, 0);
2351         dvb_frontend_wakeup(fe);
2352         fepriv->status = 0;
2353
2354         return 0;
2355 }
2356
2357 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2358                             struct dtv_properties *tvps)
2359 {
2360         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2361         struct dtv_property *tvp = NULL;
2362         struct dtv_frontend_properties getp;
2363         int i, err;
2364
2365         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2366
2367         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2368                 __func__, tvps->num);
2369         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2370                 __func__, tvps->props);
2371
2372         /*
2373          * Put an arbitrary limit on the number of messages that can
2374          * be sent at once
2375          */
2376         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2377                 return -EINVAL;
2378
2379         tvp = memdup_array_user((void __user *)tvps->props,
2380                                 tvps->num, sizeof(*tvp));
2381         if (IS_ERR(tvp))
2382                 return PTR_ERR(tvp);
2383
2384         /*
2385          * Let's use our own copy of property cache, in order to
2386          * avoid mangling with DTV zigzag logic, as drivers might
2387          * return crap, if they don't check if the data is available
2388          * before updating the properties cache.
2389          */
2390         if (fepriv->state != FESTATE_IDLE) {
2391                 err = dtv_get_frontend(fe, &getp, NULL);
2392                 if (err < 0)
2393                         goto out;
2394         }
2395         for (i = 0; i < tvps->num; i++) {
2396                 err = dtv_property_process_get(fe, &getp,
2397                                                tvp + i, file);
2398                 if (err < 0)
2399                         goto out;
2400         }
2401
2402         if (copy_to_user((void __user *)tvps->props, tvp,
2403                          tvps->num * sizeof(struct dtv_property))) {
2404                 err = -EFAULT;
2405                 goto out;
2406         }
2407
2408         err = 0;
2409 out:
2410         kfree(tvp);
2411         return err;
2412 }
2413
2414 static int dvb_get_frontend(struct dvb_frontend *fe,
2415                             struct dvb_frontend_parameters *p_out)
2416 {
2417         struct dtv_frontend_properties getp;
2418
2419         /*
2420          * Let's use our own copy of property cache, in order to
2421          * avoid mangling with DTV zigzag logic, as drivers might
2422          * return crap, if they don't check if the data is available
2423          * before updating the properties cache.
2424          */
2425         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2426
2427         return dtv_get_frontend(fe, &getp, p_out);
2428 }
2429
2430 static int dvb_frontend_handle_ioctl(struct file *file,
2431                                      unsigned int cmd, void *parg)
2432 {
2433         struct dvb_device *dvbdev = file->private_data;
2434         struct dvb_frontend *fe = dvbdev->priv;
2435         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2436         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2437         int i, err = -ENOTSUPP;
2438
2439         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2440
2441         switch (cmd) {
2442         case FE_SET_PROPERTY: {
2443                 struct dtv_properties *tvps = parg;
2444                 struct dtv_property *tvp = NULL;
2445
2446                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2447                         __func__, tvps->num);
2448                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2449                         __func__, tvps->props);
2450
2451                 /*
2452                  * Put an arbitrary limit on the number of messages that can
2453                  * be sent at once
2454                  */
2455                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2456                         return -EINVAL;
2457
2458                 tvp = memdup_array_user((void __user *)tvps->props,
2459                                         tvps->num, sizeof(*tvp));
2460                 if (IS_ERR(tvp))
2461                         return PTR_ERR(tvp);
2462
2463                 for (i = 0; i < tvps->num; i++) {
2464                         err = dtv_property_process_set(fe, file,
2465                                                        (tvp + i)->cmd,
2466                                                        (tvp + i)->u.data);
2467                         if (err < 0) {
2468                                 kfree(tvp);
2469                                 return err;
2470                         }
2471                 }
2472                 kfree(tvp);
2473                 err = 0;
2474                 break;
2475         }
2476         case FE_GET_PROPERTY:
2477                 err = dvb_get_property(fe, file, parg);
2478                 break;
2479
2480         case FE_GET_INFO: {
2481                 struct dvb_frontend_info *info = parg;
2482                 memset(info, 0, sizeof(*info));
2483
2484                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2485                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2486                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2487                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2488                 info->caps = fe->ops.info.caps;
2489                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2490                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2491                                                   &info->frequency_max,
2492                                                   &info->frequency_tolerance);
2493
2494                 /*
2495                  * Associate the 4 delivery systems supported by DVBv3
2496                  * API with their DVBv5 counterpart. For the other standards,
2497                  * use the closest type, assuming that it would hopefully
2498                  * work with a DVBv3 application.
2499                  * It should be noticed that, on multi-frontend devices with
2500                  * different types (terrestrial and cable, for example),
2501                  * a pure DVBv3 application won't be able to use all delivery
2502                  * systems. Yet, changing the DVBv5 cache to the other delivery
2503                  * system should be enough for making it work.
2504                  */
2505                 switch (dvbv3_type(c->delivery_system)) {
2506                 case DVBV3_QPSK:
2507                         info->type = FE_QPSK;
2508                         break;
2509                 case DVBV3_ATSC:
2510                         info->type = FE_ATSC;
2511                         break;
2512                 case DVBV3_QAM:
2513                         info->type = FE_QAM;
2514                         break;
2515                 case DVBV3_OFDM:
2516                         info->type = FE_OFDM;
2517                         break;
2518                 default:
2519                         dev_err(fe->dvb->device,
2520                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2521                                 __func__, c->delivery_system);
2522                         info->type = FE_OFDM;
2523                 }
2524                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2525                         __func__, c->delivery_system, info->type);
2526
2527                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2528                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2529                         info->caps |= FE_CAN_INVERSION_AUTO;
2530                 err = 0;
2531                 break;
2532         }
2533
2534         case FE_READ_STATUS: {
2535                 enum fe_status *status = parg;
2536
2537                 /* if retune was requested but hasn't occurred yet, prevent
2538                  * that user get signal state from previous tuning */
2539                 if (fepriv->state == FESTATE_RETUNE ||
2540                     fepriv->state == FESTATE_ERROR) {
2541                         err = 0;
2542                         *status = 0;
2543                         break;
2544                 }
2545
2546                 if (fe->ops.read_status)
2547                         err = fe->ops.read_status(fe, status);
2548                 break;
2549         }
2550
2551         case FE_DISEQC_RESET_OVERLOAD:
2552                 if (fe->ops.diseqc_reset_overload) {
2553                         err = fe->ops.diseqc_reset_overload(fe);
2554                         fepriv->state = FESTATE_DISEQC;
2555                         fepriv->status = 0;
2556                 }
2557                 break;
2558
2559         case FE_DISEQC_SEND_MASTER_CMD:
2560                 if (fe->ops.diseqc_send_master_cmd) {
2561                         struct dvb_diseqc_master_cmd *cmd = parg;
2562
2563                         if (cmd->msg_len > sizeof(cmd->msg)) {
2564                                 err = -EINVAL;
2565                                 break;
2566                         }
2567                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2568                         fepriv->state = FESTATE_DISEQC;
2569                         fepriv->status = 0;
2570                 }
2571                 break;
2572
2573         case FE_DISEQC_SEND_BURST:
2574                 if (fe->ops.diseqc_send_burst) {
2575                         err = fe->ops.diseqc_send_burst(fe, (long)parg);
2576                         fepriv->state = FESTATE_DISEQC;
2577                         fepriv->status = 0;
2578                 }
2579                 break;
2580
2581         case FE_SET_TONE:
2582                 if (fe->ops.set_tone) {
2583                         fepriv->tone = (long)parg;
2584                         err = fe->ops.set_tone(fe, fepriv->tone);
2585                         fepriv->state = FESTATE_DISEQC;
2586                         fepriv->status = 0;
2587                 }
2588                 break;
2589
2590         case FE_SET_VOLTAGE:
2591                 if (fe->ops.set_voltage) {
2592                         fepriv->voltage = (long)parg;
2593                         err = fe->ops.set_voltage(fe, fepriv->voltage);
2594                         fepriv->state = FESTATE_DISEQC;
2595                         fepriv->status = 0;
2596                 }
2597                 break;
2598
2599         case FE_DISEQC_RECV_SLAVE_REPLY:
2600                 if (fe->ops.diseqc_recv_slave_reply)
2601                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2602                 break;
2603
2604         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2605                 if (fe->ops.enable_high_lnb_voltage)
2606                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2607                 break;
2608
2609         case FE_SET_FRONTEND_TUNE_MODE:
2610                 fepriv->tune_mode_flags = (unsigned long)parg;
2611                 err = 0;
2612                 break;
2613         /* DEPRECATED dish control ioctls */
2614
2615         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2616                 if (fe->ops.dishnetwork_send_legacy_command) {
2617                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2618                                                          (unsigned long)parg);
2619                         fepriv->state = FESTATE_DISEQC;
2620                         fepriv->status = 0;
2621                 } else if (fe->ops.set_voltage) {
2622                         /*
2623                          * NOTE: This is a fallback condition.  Some frontends
2624                          * (stv0299 for instance) take longer than 8msec to
2625                          * respond to a set_voltage command.  Those switches
2626                          * need custom routines to switch properly.  For all
2627                          * other frontends, the following should work ok.
2628                          * Dish network legacy switches (as used by Dish500)
2629                          * are controlled by sending 9-bit command words
2630                          * spaced 8msec apart.
2631                          * the actual command word is switch/port dependent
2632                          * so it is up to the userspace application to send
2633                          * the right command.
2634                          * The command must always start with a '0' after
2635                          * initialization, so parg is 8 bits and does not
2636                          * include the initialization or start bit
2637                          */
2638                         unsigned long swcmd = ((unsigned long)parg) << 1;
2639                         ktime_t nexttime;
2640                         ktime_t tv[10];
2641                         int i;
2642                         u8 last = 1;
2643
2644                         if (dvb_frontend_debug)
2645                                 dprintk("switch command: 0x%04lx\n",
2646                                         swcmd);
2647                         nexttime = ktime_get_boottime();
2648                         if (dvb_frontend_debug)
2649                                 tv[0] = nexttime;
2650                         /* before sending a command, initialize by sending
2651                          * a 32ms 18V to the switch
2652                          */
2653                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2654                         dvb_frontend_sleep_until(&nexttime, 32000);
2655
2656                         for (i = 0; i < 9; i++) {
2657                                 if (dvb_frontend_debug)
2658                                         tv[i + 1] = ktime_get_boottime();
2659                                 if ((swcmd & 0x01) != last) {
2660                                         /* set voltage to (last ? 13V : 18V) */
2661                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2662                                         last = (last) ? 0 : 1;
2663                                 }
2664                                 swcmd = swcmd >> 1;
2665                                 if (i != 8)
2666                                         dvb_frontend_sleep_until(&nexttime, 8000);
2667                         }
2668                         if (dvb_frontend_debug) {
2669                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2670                                         fe->dvb->num);
2671                                 for (i = 1; i < 10; i++)
2672                                         pr_info("%d: %d\n", i,
2673                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2674                         }
2675                         err = 0;
2676                         fepriv->state = FESTATE_DISEQC;
2677                         fepriv->status = 0;
2678                 }
2679                 break;
2680
2681         /* DEPRECATED statistics ioctls */
2682
2683         case FE_READ_BER:
2684                 if (fe->ops.read_ber) {
2685                         if (fepriv->thread)
2686                                 err = fe->ops.read_ber(fe, parg);
2687                         else
2688                                 err = -EAGAIN;
2689                 }
2690                 break;
2691
2692         case FE_READ_SIGNAL_STRENGTH:
2693                 if (fe->ops.read_signal_strength) {
2694                         if (fepriv->thread)
2695                                 err = fe->ops.read_signal_strength(fe, parg);
2696                         else
2697                                 err = -EAGAIN;
2698                 }
2699                 break;
2700
2701         case FE_READ_SNR:
2702                 if (fe->ops.read_snr) {
2703                         if (fepriv->thread)
2704                                 err = fe->ops.read_snr(fe, parg);
2705                         else
2706                                 err = -EAGAIN;
2707                 }
2708                 break;
2709
2710         case FE_READ_UNCORRECTED_BLOCKS:
2711                 if (fe->ops.read_ucblocks) {
2712                         if (fepriv->thread)
2713                                 err = fe->ops.read_ucblocks(fe, parg);
2714                         else
2715                                 err = -EAGAIN;
2716                 }
2717                 break;
2718
2719         /* DEPRECATED DVBv3 ioctls */
2720
2721         case FE_SET_FRONTEND:
2722                 err = dvbv3_set_delivery_system(fe);
2723                 if (err)
2724                         break;
2725
2726                 err = dtv_property_cache_sync(fe, c, parg);
2727                 if (err)
2728                         break;
2729                 err = dtv_set_frontend(fe);
2730                 break;
2731
2732         case FE_GET_EVENT:
2733                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2734                 break;
2735
2736         case FE_GET_FRONTEND:
2737                 err = dvb_get_frontend(fe, parg);
2738                 break;
2739
2740         default:
2741                 return -ENOTSUPP;
2742         } /* switch */
2743
2744         return err;
2745 }
2746
2747 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2748 {
2749         struct dvb_device *dvbdev = file->private_data;
2750         struct dvb_frontend *fe = dvbdev->priv;
2751         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2752
2753         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2754
2755         poll_wait(file, &fepriv->events.wait_queue, wait);
2756
2757         if (fepriv->events.eventw != fepriv->events.eventr)
2758                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2759
2760         return 0;
2761 }
2762
2763 static int dvb_frontend_open(struct inode *inode, struct file *file)
2764 {
2765         struct dvb_device *dvbdev = file->private_data;
2766         struct dvb_frontend *fe = dvbdev->priv;
2767         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2768         struct dvb_adapter *adapter = fe->dvb;
2769         int ret;
2770
2771         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2772         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2773                 return -ENODEV;
2774
2775         if (adapter->mfe_shared == 2) {
2776                 mutex_lock(&adapter->mfe_lock);
2777                 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2778                         if (adapter->mfe_dvbdev &&
2779                             !adapter->mfe_dvbdev->writers) {
2780                                 mutex_unlock(&adapter->mfe_lock);
2781                                 return -EBUSY;
2782                         }
2783                         adapter->mfe_dvbdev = dvbdev;
2784                 }
2785         } else if (adapter->mfe_shared) {
2786                 mutex_lock(&adapter->mfe_lock);
2787
2788                 if (!adapter->mfe_dvbdev)
2789                         adapter->mfe_dvbdev = dvbdev;
2790
2791                 else if (adapter->mfe_dvbdev != dvbdev) {
2792                         struct dvb_device
2793                                 *mfedev = adapter->mfe_dvbdev;
2794                         struct dvb_frontend
2795                                 *mfe = mfedev->priv;
2796                         struct dvb_frontend_private
2797                                 *mfepriv = mfe->frontend_priv;
2798                         int mferetry = (dvb_mfe_wait_time << 1);
2799
2800                         mutex_unlock(&adapter->mfe_lock);
2801                         while (mferetry-- && (mfedev->users != -1 ||
2802                                               mfepriv->thread)) {
2803                                 if (msleep_interruptible(500)) {
2804                                         if (signal_pending(current))
2805                                                 return -EINTR;
2806                                 }
2807                         }
2808
2809                         mutex_lock(&adapter->mfe_lock);
2810                         if (adapter->mfe_dvbdev != dvbdev) {
2811                                 mfedev = adapter->mfe_dvbdev;
2812                                 mfe = mfedev->priv;
2813                                 mfepriv = mfe->frontend_priv;
2814                                 if (mfedev->users != -1 ||
2815                                     mfepriv->thread) {
2816                                         mutex_unlock(&adapter->mfe_lock);
2817                                         return -EBUSY;
2818                                 }
2819                                 adapter->mfe_dvbdev = dvbdev;
2820                         }
2821                 }
2822         }
2823
2824         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2825                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2826                         goto err0;
2827
2828                 /* If we took control of the bus, we need to force
2829                    reinitialization.  This is because many ts_bus_ctrl()
2830                    functions strobe the RESET pin on the demod, and if the
2831                    frontend thread already exists then the dvb_init() routine
2832                    won't get called (which is what usually does initial
2833                    register configuration). */
2834                 fepriv->reinitialise = 1;
2835         }
2836
2837         if ((ret = dvb_generic_open(inode, file)) < 0)
2838                 goto err1;
2839
2840         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2841                 /* normal tune mode when opened R/W */
2842                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2843                 fepriv->tone = -1;
2844                 fepriv->voltage = -1;
2845
2846 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2847                 mutex_lock(&fe->dvb->mdev_lock);
2848                 if (fe->dvb->mdev) {
2849                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2850                         if (fe->dvb->mdev->enable_source)
2851                                 ret = fe->dvb->mdev->enable_source(
2852                                                            dvbdev->entity,
2853                                                            &fepriv->pipe);
2854                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2855                         if (ret) {
2856                                 mutex_unlock(&fe->dvb->mdev_lock);
2857                                 dev_err(fe->dvb->device,
2858                                         "Tuner is busy. Error %d\n", ret);
2859                                 goto err2;
2860                         }
2861                 }
2862                 mutex_unlock(&fe->dvb->mdev_lock);
2863 #endif
2864                 ret = dvb_frontend_start(fe);
2865                 if (ret)
2866                         goto err3;
2867
2868                 /*  empty event queue */
2869                 fepriv->events.eventr = fepriv->events.eventw = 0;
2870         }
2871
2872         dvb_frontend_get(fe);
2873
2874         if (adapter->mfe_shared)
2875                 mutex_unlock(&adapter->mfe_lock);
2876         return ret;
2877
2878 err3:
2879 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2880         mutex_lock(&fe->dvb->mdev_lock);
2881         if (fe->dvb->mdev) {
2882                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2883                 if (fe->dvb->mdev->disable_source)
2884                         fe->dvb->mdev->disable_source(dvbdev->entity);
2885                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2886         }
2887         mutex_unlock(&fe->dvb->mdev_lock);
2888 err2:
2889 #endif
2890         dvb_generic_release(inode, file);
2891 err1:
2892         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2893                 fe->ops.ts_bus_ctrl(fe, 0);
2894 err0:
2895         if (adapter->mfe_shared)
2896                 mutex_unlock(&adapter->mfe_lock);
2897         return ret;
2898 }
2899
2900 static int dvb_frontend_release(struct inode *inode, struct file *file)
2901 {
2902         struct dvb_device *dvbdev = file->private_data;
2903         struct dvb_frontend *fe = dvbdev->priv;
2904         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2905         int ret;
2906
2907         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2908
2909         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2910                 fepriv->release_jiffies = jiffies;
2911                 mb();
2912         }
2913
2914         ret = dvb_generic_release(inode, file);
2915
2916         if (dvbdev->users == -1) {
2917                 wake_up(&fepriv->wait_queue);
2918 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2919                 mutex_lock(&fe->dvb->mdev_lock);
2920                 if (fe->dvb->mdev) {
2921                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2922                         if (fe->dvb->mdev->disable_source)
2923                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2924                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2925                 }
2926                 mutex_unlock(&fe->dvb->mdev_lock);
2927 #endif
2928                 if (fe->exit != DVB_FE_NO_EXIT)
2929                         wake_up(&dvbdev->wait_queue);
2930                 if (fe->ops.ts_bus_ctrl)
2931                         fe->ops.ts_bus_ctrl(fe, 0);
2932         }
2933
2934         dvb_frontend_put(fe);
2935
2936         return ret;
2937 }
2938
2939 static const struct file_operations dvb_frontend_fops = {
2940         .owner          = THIS_MODULE,
2941         .unlocked_ioctl = dvb_frontend_ioctl,
2942 #ifdef CONFIG_COMPAT
2943         .compat_ioctl   = dvb_frontend_compat_ioctl,
2944 #endif
2945         .poll           = dvb_frontend_poll,
2946         .open           = dvb_frontend_open,
2947         .release        = dvb_frontend_release,
2948         .llseek         = noop_llseek,
2949 };
2950
2951 int dvb_frontend_suspend(struct dvb_frontend *fe)
2952 {
2953         int ret = 0;
2954
2955         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2956                 fe->id);
2957
2958         if (fe->ops.tuner_ops.suspend)
2959                 ret = fe->ops.tuner_ops.suspend(fe);
2960         else if (fe->ops.tuner_ops.sleep)
2961                 ret = fe->ops.tuner_ops.sleep(fe);
2962
2963         if (fe->ops.suspend)
2964                 ret = fe->ops.suspend(fe);
2965         else if (fe->ops.sleep)
2966                 ret = fe->ops.sleep(fe);
2967
2968         return ret;
2969 }
2970 EXPORT_SYMBOL(dvb_frontend_suspend);
2971
2972 int dvb_frontend_resume(struct dvb_frontend *fe)
2973 {
2974         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2975         int ret = 0;
2976
2977         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2978                 fe->id);
2979
2980         fe->exit = DVB_FE_DEVICE_RESUME;
2981         if (fe->ops.resume)
2982                 ret = fe->ops.resume(fe);
2983         else if (fe->ops.init)
2984                 ret = fe->ops.init(fe);
2985
2986         if (fe->ops.tuner_ops.resume)
2987                 ret = fe->ops.tuner_ops.resume(fe);
2988         else if (fe->ops.tuner_ops.init)
2989                 ret = fe->ops.tuner_ops.init(fe);
2990
2991         if (fe->ops.set_tone && fepriv->tone != -1)
2992                 fe->ops.set_tone(fe, fepriv->tone);
2993         if (fe->ops.set_voltage && fepriv->voltage != -1)
2994                 fe->ops.set_voltage(fe, fepriv->voltage);
2995
2996         fe->exit = DVB_FE_NO_EXIT;
2997         fepriv->state = FESTATE_RETUNE;
2998         dvb_frontend_wakeup(fe);
2999
3000         return ret;
3001 }
3002 EXPORT_SYMBOL(dvb_frontend_resume);
3003
3004 int dvb_register_frontend(struct dvb_adapter *dvb,
3005                           struct dvb_frontend *fe)
3006 {
3007         struct dvb_frontend_private *fepriv;
3008         const struct dvb_device dvbdev_template = {
3009                 .users = ~0,
3010                 .writers = 1,
3011                 .readers = (~0) - 1,
3012                 .fops = &dvb_frontend_fops,
3013 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3014                 .name = fe->ops.info.name,
3015 #endif
3016         };
3017         int ret;
3018
3019         dev_dbg(dvb->device, "%s:\n", __func__);
3020
3021         if (mutex_lock_interruptible(&frontend_mutex))
3022                 return -ERESTARTSYS;
3023
3024         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3025         if (!fe->frontend_priv) {
3026                 mutex_unlock(&frontend_mutex);
3027                 return -ENOMEM;
3028         }
3029         fepriv = fe->frontend_priv;
3030
3031         kref_init(&fe->refcount);
3032
3033         /*
3034          * After initialization, there need to be two references: one
3035          * for dvb_unregister_frontend(), and another one for
3036          * dvb_frontend_detach().
3037          */
3038         dvb_frontend_get(fe);
3039
3040         sema_init(&fepriv->sem, 1);
3041         init_waitqueue_head(&fepriv->wait_queue);
3042         init_waitqueue_head(&fepriv->events.wait_queue);
3043         mutex_init(&fepriv->events.mtx);
3044         fe->dvb = dvb;
3045         fepriv->inversion = INVERSION_OFF;
3046
3047         dev_info(fe->dvb->device,
3048                  "DVB: registering adapter %i frontend %i (%s)...\n",
3049                  fe->dvb->num, fe->id, fe->ops.info.name);
3050
3051         ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3052                             fe, DVB_DEVICE_FRONTEND, 0);
3053         if (ret) {
3054                 dvb_frontend_put(fe);
3055                 mutex_unlock(&frontend_mutex);
3056                 return ret;
3057         }
3058
3059         /*
3060          * Initialize the cache to the proper values according with the
3061          * first supported delivery system (ops->delsys[0])
3062          */
3063
3064         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3065         dvb_frontend_clear_cache(fe);
3066
3067         mutex_unlock(&frontend_mutex);
3068         return 0;
3069 }
3070 EXPORT_SYMBOL(dvb_register_frontend);
3071
3072 int dvb_unregister_frontend(struct dvb_frontend *fe)
3073 {
3074         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3075
3076         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3077
3078         mutex_lock(&frontend_mutex);
3079         dvb_frontend_stop(fe);
3080         dvb_remove_device(fepriv->dvbdev);
3081
3082         /* fe is invalid now */
3083         mutex_unlock(&frontend_mutex);
3084         dvb_frontend_put(fe);
3085         return 0;
3086 }
3087 EXPORT_SYMBOL(dvb_unregister_frontend);
3088
3089 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3090                                         void (*release)(struct dvb_frontend *fe))
3091 {
3092         if (release) {
3093                 release(fe);
3094 #ifdef CONFIG_MEDIA_ATTACH
3095                 dvb_detach(release);
3096 #endif
3097         }
3098 }
3099
3100 void dvb_frontend_detach(struct dvb_frontend *fe)
3101 {
3102         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3103         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3104         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3105         dvb_frontend_put(fe);
3106 }
3107 EXPORT_SYMBOL(dvb_frontend_detach);