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 restart:
 683                 wait_event_interruptible_timeout(fepriv->wait_queue,
 684                                                  dvb_frontend_should_wakeup(fe) ||
 685                                                  kthread_should_stop() ||
 686                                                  freezing(current),
 687                         fepriv->delay);
 688
 689                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 690                         /* got signal or quitting */
 691                         if (!down_interruptible(&fepriv->sem))
 692                                 semheld = true;
 693                         fe->exit = DVB_FE_NORMAL_EXIT;
 694                         break;
 695                 }
 696
 697                 if (try_to_freeze())
 698                         goto restart;
 699
 700                 if (down_interruptible(&fepriv->sem))
 701                         break;
 702
 703                 if (fepriv->reinitialise) {
 704                         dvb_frontend_init(fe);
 705                         if (fe->ops.set_tone && fepriv->tone != -1)
 706                                 fe->ops.set_tone(fe, fepriv->tone);
 707                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 708                                 fe->ops.set_voltage(fe, fepriv->voltage);
 709                         fepriv->reinitialise = 0;
 710                 }
 711
 712                 /* do an iteration of the tuning loop */
 713                 if (fe->ops.get_frontend_algo) {
 714                         algo = fe->ops.get_frontend_algo(fe);
 715                         switch (algo) {
 716                         case DVBFE_ALGO_HW:
 717                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 718
 719                                 if (fepriv->state & FESTATE_RETUNE) {
 720                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 721                                         re_tune = true;
 722                                         fepriv->state = FESTATE_TUNED;
 723                                 } else {
 724                                         re_tune = false;
 725                                 }
 726
 727                                 if (fe->ops.tune)
 728                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 729
 730                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 731                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 732                                         dvb_frontend_add_event(fe, s);
 733                                         fepriv->status = s;
 734                                 }
 735                                 break;
 736                         case DVBFE_ALGO_SW:
 737                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 738                                 dvb_frontend_swzigzag(fe);
 739                                 break;
 740                         case DVBFE_ALGO_CUSTOM:
 741                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 742                                 if (fepriv->state & FESTATE_RETUNE) {
 743                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 744                                         fepriv->state = FESTATE_TUNED;
 745                                 }
 746                                 /* Case where we are going to search for a carrier
 747                                  * User asked us to retune again for some reason, possibly
 748                                  * requesting a search with a new set of parameters
 749                                  */
 750                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 751                                         if (fe->ops.search) {
 752                                                 fepriv->algo_status = fe->ops.search(fe);
 753                                                 /* We did do a search as was requested, the flags are
 754                                                  * now unset as well and has the flags wrt to search.
 755                                                  */
 756                                         } else {
 757                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 758                                         }
 759                                 }
 760                                 /* Track the carrier if the search was successful */
 761                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 762                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 763                                         fepriv->delay = HZ / 2;
 764                                 }
 765                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 766                                 fe->ops.read_status(fe, &s);
 767                                 if (s != fepriv->status) {
 768                                         dvb_frontend_add_event(fe, s); /* update event list */
 769                                         fepriv->status = s;
 770                                         if (!(s & FE_HAS_LOCK)) {
 771                                                 fepriv->delay = HZ / 10;
 772                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 773                                         } else {
 774                                                 fepriv->delay = 60 * HZ;
 775                                         }
 776                                 }
 777                                 break;
 778                         default:
 779                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 780                                 break;
 781                         }
 782                 } else {
 783                         dvb_frontend_swzigzag(fe);
 784                 }
 785         }
 786
 787         if (dvb_powerdown_on_sleep) {
 788                 if (fe->ops.set_voltage)
 789                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 790                 if (fe->ops.tuner_ops.sleep) {
 791                         if (fe->ops.i2c_gate_ctrl)
 792                                 fe->ops.i2c_gate_ctrl(fe, 1);
 793                         fe->ops.tuner_ops.sleep(fe);
 794                         if (fe->ops.i2c_gate_ctrl)
 795                                 fe->ops.i2c_gate_ctrl(fe, 0);
 796                 }
 797                 if (fe->ops.sleep)
 798                         fe->ops.sleep(fe);
 799         }
 800
 801         fepriv->thread = NULL;
 802         if (kthread_should_stop())
 803                 fe->exit = DVB_FE_DEVICE_REMOVED;
 804         else
 805                 fe->exit = DVB_FE_NO_EXIT;
 806         mb();
 807
 808         if (semheld)
 809                 up(&fepriv->sem);
 810         dvb_frontend_wakeup(fe);
 811         return 0;
 812 }
 813
 814 static void dvb_frontend_stop(struct dvb_frontend *fe)
 815 {
 816         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 817
 818         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 819
 820         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 821                 fe->exit = DVB_FE_NORMAL_EXIT;
 822         mb();
 823
 824         if (!fepriv->thread)
 825                 return;
 826
 827         kthread_stop(fepriv->thread);
 828
 829         sema_init(&fepriv->sem, 1);
 830         fepriv->state = FESTATE_IDLE;
 831
 832         /* paranoia check in case a signal arrived */
 833         if (fepriv->thread)
 834                 dev_warn(fe->dvb->device,
 835                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 836                          fepriv->thread);
 837 }
 838
 839 /*
 840  * Sleep for the amount of time given by add_usec parameter
 841  *
 842  * This needs to be as precise as possible, as it affects the detection of
 843  * the dish tone command at the satellite subsystem. The precision is improved
 844  * by using a scheduled msleep followed by udelay for the remainder.
 845  */
 846 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 847 {
 848         s32 delta;
 849
 850         *waketime = ktime_add_us(*waketime, add_usec);
 851         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 852         if (delta > 2500) {
 853                 msleep((delta - 1500) / 1000);
 854                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 855         }
 856         if (delta > 0)
 857                 udelay(delta);
 858 }
 859 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 860
 861 static int dvb_frontend_start(struct dvb_frontend *fe)
 862 {
 863         int ret;
 864         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 865         struct task_struct *fe_thread;
 866
 867         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 868
 869         if (fepriv->thread) {
 870                 if (fe->exit == DVB_FE_NO_EXIT)
 871                         return 0;
 872                 else
 873                         dvb_frontend_stop(fe);
 874         }
 875
 876         if (signal_pending(current))
 877                 return -EINTR;
 878         if (down_interruptible(&fepriv->sem))
 879                 return -EINTR;
 880
 881         fepriv->state = FESTATE_IDLE;
 882         fe->exit = DVB_FE_NO_EXIT;
 883         fepriv->thread = NULL;
 884         mb();
 885
 886         fe_thread = kthread_run(dvb_frontend_thread, fe,
 887                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 888         if (IS_ERR(fe_thread)) {
 889                 ret = PTR_ERR(fe_thread);
 890                 dev_warn(fe->dvb->device,
 891                          "dvb_frontend_start: failed to start kthread (%d)\n",
 892                          ret);
 893                 up(&fepriv->sem);
 894                 return ret;
 895         }
 896         fepriv->thread = fe_thread;
 897         return 0;
 898 }
 899
 900 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 901                                               u32 *freq_min, u32 *freq_max,
 902                                               u32 *tolerance)
 903 {
 904         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 905         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 906         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 907         u32 frontend_min = fe->ops.info.frequency_min_hz;
 908         u32 frontend_max = fe->ops.info.frequency_max_hz;
 909
 910         *freq_min = max(frontend_min, tuner_min);
 911
 912         if (frontend_max == 0)
 913                 *freq_max = tuner_max;
 914         else if (tuner_max == 0)
 915                 *freq_max = frontend_max;
 916         else
 917                 *freq_max = min(frontend_max, tuner_max);
 918
 919         if (*freq_min == 0 || *freq_max == 0)
 920                 dev_warn(fe->dvb->device,
 921                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 922                          fe->dvb->num, fe->id);
 923
 924         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 925                 tuner_min, tuner_max, frontend_min, frontend_max);
 926
 927         /* If the standard is for satellite, convert frequencies to kHz */
 928         switch (c->delivery_system) {
 929         case SYS_DSS:
 930         case SYS_DVBS:
 931         case SYS_DVBS2:
 932         case SYS_TURBO:
 933         case SYS_ISDBS:
 934                 *freq_min /= kHz;
 935                 *freq_max /= kHz;
 936                 if (tolerance)
 937                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 938
 939                 break;
 940         default:
 941                 if (tolerance)
 942                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 943                 break;
 944         }
 945 }
 946
 947 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 948 {
 949         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 950         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 951         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 952         u32 step = max(fe_step, tuner_step);
 953
 954         switch (c->delivery_system) {
 955         case SYS_DSS:
 956         case SYS_DVBS:
 957         case SYS_DVBS2:
 958         case SYS_TURBO:
 959         case SYS_ISDBS:
 960                 step /= kHz;
 961                 break;
 962         default:
 963                 break;
 964         }
 965
 966         return step;
 967 }
 968
 969 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 970 {
 971         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 972         u32 freq_min;
 973         u32 freq_max;
 974
 975         /* range check: frequency */
 976         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 977         if ((freq_min && c->frequency < freq_min) ||
 978             (freq_max && c->frequency > freq_max)) {
 979                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 980                          fe->dvb->num, fe->id, c->frequency,
 981                          freq_min, freq_max);
 982                 return -EINVAL;
 983         }
 984
 985         /* range check: symbol rate */
 986         switch (c->delivery_system) {
 987         case SYS_DSS:
 988         case SYS_DVBS:
 989         case SYS_DVBS2:
 990         case SYS_TURBO:
 991         case SYS_DVBC_ANNEX_A:
 992         case SYS_DVBC_ANNEX_C:
 993                 if ((fe->ops.info.symbol_rate_min &&
 994                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 995                     (fe->ops.info.symbol_rate_max &&
 996                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 997                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 998                                  fe->dvb->num, fe->id, c->symbol_rate,
 999                                  fe->ops.info.symbol_rate_min,
1000                                  fe->ops.info.symbol_rate_max);
1001                         return -EINVAL;
1002                 }
1003                 break;
1004         default:
1005                 break;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1012 {
1013         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1014         int i;
1015         u32 delsys;
1016
1017         delsys = c->delivery_system;
1018         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1019         c->delivery_system = delsys;
1020
1021         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1022                 __func__, c->delivery_system);
1023
1024         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1025         c->bandwidth_hz = 0;    /* AUTO */
1026         c->guard_interval = GUARD_INTERVAL_AUTO;
1027         c->hierarchy = HIERARCHY_AUTO;
1028         c->symbol_rate = 0;
1029         c->code_rate_HP = FEC_AUTO;
1030         c->code_rate_LP = FEC_AUTO;
1031         c->fec_inner = FEC_AUTO;
1032         c->rolloff = ROLLOFF_AUTO;
1033         c->voltage = SEC_VOLTAGE_OFF;
1034         c->sectone = SEC_TONE_OFF;
1035         c->pilot = PILOT_AUTO;
1036
1037         c->isdbt_partial_reception = 0;
1038         c->isdbt_sb_mode = 0;
1039         c->isdbt_sb_subchannel = 0;
1040         c->isdbt_sb_segment_idx = 0;
1041         c->isdbt_sb_segment_count = 0;
1042         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1043         for (i = 0; i < 3; i++) {
1044                 c->layer[i].fec = FEC_AUTO;
1045                 c->layer[i].modulation = QAM_AUTO;
1046                 c->layer[i].interleaving = 0;
1047                 c->layer[i].segment_count = 0;
1048         }
1049
1050         c->stream_id = NO_STREAM_ID_FILTER;
1051         c->scrambling_sequence_index = 0;/* default sequence */
1052
1053         switch (c->delivery_system) {
1054         case SYS_DSS:
1055                 c->modulation = QPSK;
1056                 c->rolloff = ROLLOFF_20;
1057                 break;
1058         case SYS_DVBS:
1059         case SYS_DVBS2:
1060         case SYS_TURBO:
1061                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1062                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1063                 break;
1064         case SYS_ATSC:
1065                 c->modulation = VSB_8;
1066                 break;
1067         case SYS_ISDBS:
1068                 c->symbol_rate = 28860000;
1069                 c->rolloff = ROLLOFF_35;
1070                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1071                 break;
1072         default:
1073                 c->modulation = QAM_AUTO;
1074                 break;
1075         }
1076
1077         c->lna = LNA_AUTO;
1078
1079         return 0;
1080 }
1081
1082 #define _DTV_CMD(n) \
1083         [n] =  #n
1084
1085 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1086         _DTV_CMD(DTV_TUNE),
1087         _DTV_CMD(DTV_CLEAR),
1088
1089         /* Set */
1090         _DTV_CMD(DTV_FREQUENCY),
1091         _DTV_CMD(DTV_BANDWIDTH_HZ),
1092         _DTV_CMD(DTV_MODULATION),
1093         _DTV_CMD(DTV_INVERSION),
1094         _DTV_CMD(DTV_DISEQC_MASTER),
1095         _DTV_CMD(DTV_SYMBOL_RATE),
1096         _DTV_CMD(DTV_INNER_FEC),
1097         _DTV_CMD(DTV_VOLTAGE),
1098         _DTV_CMD(DTV_TONE),
1099         _DTV_CMD(DTV_PILOT),
1100         _DTV_CMD(DTV_ROLLOFF),
1101         _DTV_CMD(DTV_DELIVERY_SYSTEM),
1102         _DTV_CMD(DTV_HIERARCHY),
1103         _DTV_CMD(DTV_CODE_RATE_HP),
1104         _DTV_CMD(DTV_CODE_RATE_LP),
1105         _DTV_CMD(DTV_GUARD_INTERVAL),
1106         _DTV_CMD(DTV_TRANSMISSION_MODE),
1107         _DTV_CMD(DTV_INTERLEAVING),
1108
1109         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1110         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1111         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1112         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1113         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1114         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1115         _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1116         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1117         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1118         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1119         _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1120         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1121         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1122         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1123         _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1124         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1125         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1126         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1127
1128         _DTV_CMD(DTV_STREAM_ID),
1129         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1130         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1131         _DTV_CMD(DTV_LNA),
1132
1133         /* Get */
1134         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1135         _DTV_CMD(DTV_API_VERSION),
1136
1137         _DTV_CMD(DTV_ENUM_DELSYS),
1138
1139         _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1140         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1141
1142         _DTV_CMD(DTV_ATSCMH_FIC_VER),
1143         _DTV_CMD(DTV_ATSCMH_NOG),
1144         _DTV_CMD(DTV_ATSCMH_TNOG),
1145         _DTV_CMD(DTV_ATSCMH_SGN),
1146         _DTV_CMD(DTV_ATSCMH_PRC),
1147         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1148         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1149         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1150         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1151         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1152         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1153         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1154         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1155
1156         /* Statistics API */
1157         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1158         _DTV_CMD(DTV_STAT_CNR),
1159         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1160         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1161         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1162         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1163         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1164         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1165 };
1166
1167 static char *dtv_cmd_name(u32 cmd)
1168 {
1169         cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1170         return dtv_cmds[cmd];
1171 }
1172
1173 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1174  * drivers can use a single set_frontend tuning function, regardless of whether
1175  * it's being used for the legacy or new API, reducing code and complexity.
1176  */
1177 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1178                                    struct dtv_frontend_properties *c,
1179                                    const struct dvb_frontend_parameters *p)
1180 {
1181         c->frequency = p->frequency;
1182         c->inversion = p->inversion;
1183
1184         switch (dvbv3_type(c->delivery_system)) {
1185         case DVBV3_QPSK:
1186                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1187                 c->symbol_rate = p->u.qpsk.symbol_rate;
1188                 c->fec_inner = p->u.qpsk.fec_inner;
1189                 break;
1190         case DVBV3_QAM:
1191                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1192                 c->symbol_rate = p->u.qam.symbol_rate;
1193                 c->fec_inner = p->u.qam.fec_inner;
1194                 c->modulation = p->u.qam.modulation;
1195                 break;
1196         case DVBV3_OFDM:
1197                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1198
1199                 switch (p->u.ofdm.bandwidth) {
1200                 case BANDWIDTH_10_MHZ:
1201                         c->bandwidth_hz = 10000000;
1202                         break;
1203                 case BANDWIDTH_8_MHZ:
1204                         c->bandwidth_hz = 8000000;
1205                         break;
1206                 case BANDWIDTH_7_MHZ:
1207                         c->bandwidth_hz = 7000000;
1208                         break;
1209                 case BANDWIDTH_6_MHZ:
1210                         c->bandwidth_hz = 6000000;
1211                         break;
1212                 case BANDWIDTH_5_MHZ:
1213                         c->bandwidth_hz = 5000000;
1214                         break;
1215                 case BANDWIDTH_1_712_MHZ:
1216                         c->bandwidth_hz = 1712000;
1217                         break;
1218                 case BANDWIDTH_AUTO:
1219                         c->bandwidth_hz = 0;
1220                 }
1221
1222                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1223                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1224                 c->modulation = p->u.ofdm.constellation;
1225                 c->transmission_mode = p->u.ofdm.transmission_mode;
1226                 c->guard_interval = p->u.ofdm.guard_interval;
1227                 c->hierarchy = p->u.ofdm.hierarchy_information;
1228                 break;
1229         case DVBV3_ATSC:
1230                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1231                 c->modulation = p->u.vsb.modulation;
1232                 if (c->delivery_system == SYS_ATSCMH)
1233                         break;
1234                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1235                         c->delivery_system = SYS_ATSC;
1236                 else
1237                         c->delivery_system = SYS_DVBC_ANNEX_B;
1238                 break;
1239         case DVBV3_UNKNOWN:
1240                 dev_err(fe->dvb->device,
1241                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1242                         __func__, c->delivery_system);
1243                 return -EINVAL;
1244         }
1245
1246         return 0;
1247 }
1248
1249 /* Ensure the cached values are set correctly in the frontend
1250  * legacy tuning structures, for the advanced tuning API.
1251  */
1252 static int
1253 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1254                                 const struct dtv_frontend_properties *c,
1255                                 struct dvb_frontend_parameters *p)
1256 {
1257         p->frequency = c->frequency;
1258         p->inversion = c->inversion;
1259
1260         switch (dvbv3_type(c->delivery_system)) {
1261         case DVBV3_UNKNOWN:
1262                 dev_err(fe->dvb->device,
1263                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1264                         __func__, c->delivery_system);
1265                 return -EINVAL;
1266         case DVBV3_QPSK:
1267                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1268                 p->u.qpsk.symbol_rate = c->symbol_rate;
1269                 p->u.qpsk.fec_inner = c->fec_inner;
1270                 break;
1271         case DVBV3_QAM:
1272                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1273                 p->u.qam.symbol_rate = c->symbol_rate;
1274                 p->u.qam.fec_inner = c->fec_inner;
1275                 p->u.qam.modulation = c->modulation;
1276                 break;
1277         case DVBV3_OFDM:
1278                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1279                 switch (c->bandwidth_hz) {
1280                 case 10000000:
1281                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1282                         break;
1283                 case 8000000:
1284                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1285                         break;
1286                 case 7000000:
1287                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1288                         break;
1289                 case 6000000:
1290                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1291                         break;
1292                 case 5000000:
1293                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1294                         break;
1295                 case 1712000:
1296                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1297                         break;
1298                 case 0:
1299                 default:
1300                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1301                 }
1302                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1303                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1304                 p->u.ofdm.constellation = c->modulation;
1305                 p->u.ofdm.transmission_mode = c->transmission_mode;
1306                 p->u.ofdm.guard_interval = c->guard_interval;
1307                 p->u.ofdm.hierarchy_information = c->hierarchy;
1308                 break;
1309         case DVBV3_ATSC:
1310                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1311                 p->u.vsb.modulation = c->modulation;
1312                 break;
1313         }
1314         return 0;
1315 }
1316
1317 /**
1318  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1319  * @fe:         struct dvb_frontend pointer
1320  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1321  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1322  *
1323  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1324  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1325  * If p_out is not null, it will update the DVBv3 params pointed by it.
1326  */
1327 static int dtv_get_frontend(struct dvb_frontend *fe,
1328                             struct dtv_frontend_properties *c,
1329                             struct dvb_frontend_parameters *p_out)
1330 {
1331         int r;
1332
1333         if (fe->ops.get_frontend) {
1334                 r = fe->ops.get_frontend(fe, c);
1335                 if (unlikely(r < 0))
1336                         return r;
1337                 if (p_out)
1338                         dtv_property_legacy_params_sync(fe, c, p_out);
1339                 return 0;
1340         }
1341
1342         /* As everything is in cache, get_frontend fops are always supported */
1343         return 0;
1344 }
1345
1346 static int dvb_frontend_handle_ioctl(struct file *file,
1347                                      unsigned int cmd, void *parg);
1348
1349 static int dtv_property_process_get(struct dvb_frontend *fe,
1350                                     const struct dtv_frontend_properties *c,
1351                                     struct dtv_property *tvp,
1352                                     struct file *file)
1353 {
1354         int ncaps;
1355         unsigned int len = 1;
1356
1357         switch (tvp->cmd) {
1358         case DTV_ENUM_DELSYS:
1359                 ncaps = 0;
1360                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1361                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1362                         ncaps++;
1363                 }
1364                 tvp->u.buffer.len = ncaps;
1365                 len = ncaps;
1366                 break;
1367         case DTV_FREQUENCY:
1368                 tvp->u.data = c->frequency;
1369                 break;
1370         case DTV_MODULATION:
1371                 tvp->u.data = c->modulation;
1372                 break;
1373         case DTV_BANDWIDTH_HZ:
1374                 tvp->u.data = c->bandwidth_hz;
1375                 break;
1376         case DTV_INVERSION:
1377                 tvp->u.data = c->inversion;
1378                 break;
1379         case DTV_SYMBOL_RATE:
1380                 tvp->u.data = c->symbol_rate;
1381                 break;
1382         case DTV_INNER_FEC:
1383                 tvp->u.data = c->fec_inner;
1384                 break;
1385         case DTV_PILOT:
1386                 tvp->u.data = c->pilot;
1387                 break;
1388         case DTV_ROLLOFF:
1389                 tvp->u.data = c->rolloff;
1390                 break;
1391         case DTV_DELIVERY_SYSTEM:
1392                 tvp->u.data = c->delivery_system;
1393                 break;
1394         case DTV_VOLTAGE:
1395                 tvp->u.data = c->voltage;
1396                 break;
1397         case DTV_TONE:
1398                 tvp->u.data = c->sectone;
1399                 break;
1400         case DTV_API_VERSION:
1401                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1402                 break;
1403         case DTV_CODE_RATE_HP:
1404                 tvp->u.data = c->code_rate_HP;
1405                 break;
1406         case DTV_CODE_RATE_LP:
1407                 tvp->u.data = c->code_rate_LP;
1408                 break;
1409         case DTV_GUARD_INTERVAL:
1410                 tvp->u.data = c->guard_interval;
1411                 break;
1412         case DTV_TRANSMISSION_MODE:
1413                 tvp->u.data = c->transmission_mode;
1414                 break;
1415         case DTV_HIERARCHY:
1416                 tvp->u.data = c->hierarchy;
1417                 break;
1418         case DTV_INTERLEAVING:
1419                 tvp->u.data = c->interleaving;
1420                 break;
1421
1422         /* ISDB-T Support here */
1423         case DTV_ISDBT_PARTIAL_RECEPTION:
1424                 tvp->u.data = c->isdbt_partial_reception;
1425                 break;
1426         case DTV_ISDBT_SOUND_BROADCASTING:
1427                 tvp->u.data = c->isdbt_sb_mode;
1428                 break;
1429         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1430                 tvp->u.data = c->isdbt_sb_subchannel;
1431                 break;
1432         case DTV_ISDBT_SB_SEGMENT_IDX:
1433                 tvp->u.data = c->isdbt_sb_segment_idx;
1434                 break;
1435         case DTV_ISDBT_SB_SEGMENT_COUNT:
1436                 tvp->u.data = c->isdbt_sb_segment_count;
1437                 break;
1438         case DTV_ISDBT_LAYER_ENABLED:
1439                 tvp->u.data = c->isdbt_layer_enabled;
1440                 break;
1441         case DTV_ISDBT_LAYERA_FEC:
1442                 tvp->u.data = c->layer[0].fec;
1443                 break;
1444         case DTV_ISDBT_LAYERA_MODULATION:
1445                 tvp->u.data = c->layer[0].modulation;
1446                 break;
1447         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1448                 tvp->u.data = c->layer[0].segment_count;
1449                 break;
1450         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1451                 tvp->u.data = c->layer[0].interleaving;
1452                 break;
1453         case DTV_ISDBT_LAYERB_FEC:
1454                 tvp->u.data = c->layer[1].fec;
1455                 break;
1456         case DTV_ISDBT_LAYERB_MODULATION:
1457                 tvp->u.data = c->layer[1].modulation;
1458                 break;
1459         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1460                 tvp->u.data = c->layer[1].segment_count;
1461                 break;
1462         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1463                 tvp->u.data = c->layer[1].interleaving;
1464                 break;
1465         case DTV_ISDBT_LAYERC_FEC:
1466                 tvp->u.data = c->layer[2].fec;
1467                 break;
1468         case DTV_ISDBT_LAYERC_MODULATION:
1469                 tvp->u.data = c->layer[2].modulation;
1470                 break;
1471         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1472                 tvp->u.data = c->layer[2].segment_count;
1473                 break;
1474         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1475                 tvp->u.data = c->layer[2].interleaving;
1476                 break;
1477
1478         /* Multistream support */
1479         case DTV_STREAM_ID:
1480         case DTV_DVBT2_PLP_ID_LEGACY:
1481                 tvp->u.data = c->stream_id;
1482                 break;
1483
1484         /* Physical layer scrambling support */
1485         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1486                 tvp->u.data = c->scrambling_sequence_index;
1487                 break;
1488
1489         /* ATSC-MH */
1490         case DTV_ATSCMH_FIC_VER:
1491                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1492                 break;
1493         case DTV_ATSCMH_PARADE_ID:
1494                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1495                 break;
1496         case DTV_ATSCMH_NOG:
1497                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1498                 break;
1499         case DTV_ATSCMH_TNOG:
1500                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1501                 break;
1502         case DTV_ATSCMH_SGN:
1503                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1504                 break;
1505         case DTV_ATSCMH_PRC:
1506                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1507                 break;
1508         case DTV_ATSCMH_RS_FRAME_MODE:
1509                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1510                 break;
1511         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1512                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1513                 break;
1514         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1515                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1516                 break;
1517         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1518                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1519                 break;
1520         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1521                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1522                 break;
1523         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1524                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1525                 break;
1526         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1527                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1528                 break;
1529         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1530                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1531                 break;
1532         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1533                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1534                 break;
1535
1536         case DTV_LNA:
1537                 tvp->u.data = c->lna;
1538                 break;
1539
1540         /* Fill quality measures */
1541         case DTV_STAT_SIGNAL_STRENGTH:
1542                 tvp->u.st = c->strength;
1543                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1544                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1545                 len = tvp->u.buffer.len;
1546                 break;
1547         case DTV_STAT_CNR:
1548                 tvp->u.st = c->cnr;
1549                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1550                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1551                 len = tvp->u.buffer.len;
1552                 break;
1553         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1554                 tvp->u.st = c->pre_bit_error;
1555                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1556                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1557                 len = tvp->u.buffer.len;
1558                 break;
1559         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1560                 tvp->u.st = c->pre_bit_count;
1561                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1562                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1563                 len = tvp->u.buffer.len;
1564                 break;
1565         case DTV_STAT_POST_ERROR_BIT_COUNT:
1566                 tvp->u.st = c->post_bit_error;
1567                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1568                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1569                 len = tvp->u.buffer.len;
1570                 break;
1571         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1572                 tvp->u.st = c->post_bit_count;
1573                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1574                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1575                 len = tvp->u.buffer.len;
1576                 break;
1577         case DTV_STAT_ERROR_BLOCK_COUNT:
1578                 tvp->u.st = c->block_error;
1579                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1580                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1581                 len = tvp->u.buffer.len;
1582                 break;
1583         case DTV_STAT_TOTAL_BLOCK_COUNT:
1584                 tvp->u.st = c->block_count;
1585                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1586                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1587                 len = tvp->u.buffer.len;
1588                 break;
1589         default:
1590                 dev_dbg(fe->dvb->device,
1591                         "%s: FE property %d doesn't exist\n",
1592                         __func__, tvp->cmd);
1593                 return -EINVAL;
1594         }
1595
1596         if (len < 1)
1597                 len = 1;
1598
1599         dev_dbg(fe->dvb->device,
1600                 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1601                 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1602                 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1603
1604         return 0;
1605 }
1606
1607 static int dtv_set_frontend(struct dvb_frontend *fe);
1608
1609 static bool is_dvbv3_delsys(u32 delsys)
1610 {
1611         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1612                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1613 }
1614
1615 /**
1616  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1617  * @fe:                 struct frontend;
1618  * @delsys:                     DVBv5 type that will be used for emulation
1619  *
1620  * Provides emulation for delivery systems that are compatible with the old
1621  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1622  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1623  * parameters are compatible with DVB-S spec.
1624  */
1625 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1626 {
1627         int i;
1628         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1629
1630         c->delivery_system = delsys;
1631
1632         /*
1633          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1634          */
1635         if (c->delivery_system == SYS_ISDBT) {
1636                 dev_dbg(fe->dvb->device,
1637                         "%s: Using defaults for SYS_ISDBT\n",
1638                         __func__);
1639
1640                 if (!c->bandwidth_hz)
1641                         c->bandwidth_hz = 6000000;
1642
1643                 c->isdbt_partial_reception = 0;
1644                 c->isdbt_sb_mode = 0;
1645                 c->isdbt_sb_subchannel = 0;
1646                 c->isdbt_sb_segment_idx = 0;
1647                 c->isdbt_sb_segment_count = 0;
1648                 c->isdbt_layer_enabled = 7;
1649                 for (i = 0; i < 3; i++) {
1650                         c->layer[i].fec = FEC_AUTO;
1651                         c->layer[i].modulation = QAM_AUTO;
1652                         c->layer[i].interleaving = 0;
1653                         c->layer[i].segment_count = 0;
1654                 }
1655         }
1656         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1657                 __func__, c->delivery_system);
1658
1659         return 0;
1660 }
1661
1662 /**
1663  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1664  * @fe:                 frontend struct
1665  * @desired_system:     delivery system requested by the user
1666  *
1667  * A DVBv5 call know what's the desired system it wants. So, set it.
1668  *
1669  * There are, however, a few known issues with early DVBv5 applications that
1670  * are also handled by this logic:
1671  *
1672  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1673  *    This is an API violation, but, as we don't want to break userspace,
1674  *    convert it to the first supported delivery system.
1675  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1676  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1677  *    ISDB-T provided backward compat with DVB-T.
1678  */
1679 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1680                                      u32 desired_system)
1681 {
1682         int ncaps;
1683         u32 delsys = SYS_UNDEFINED;
1684         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1685         enum dvbv3_emulation_type type;
1686
1687         /*
1688          * It was reported that some old DVBv5 applications were
1689          * filling delivery_system with SYS_UNDEFINED. If this happens,
1690          * assume that the application wants to use the first supported
1691          * delivery system.
1692          */
1693         if (desired_system == SYS_UNDEFINED)
1694                 desired_system = fe->ops.delsys[0];
1695
1696         /*
1697          * This is a DVBv5 call. So, it likely knows the supported
1698          * delivery systems. So, check if the desired delivery system is
1699          * supported
1700          */
1701         ncaps = 0;
1702         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703                 if (fe->ops.delsys[ncaps] == desired_system) {
1704                         c->delivery_system = desired_system;
1705                         dev_dbg(fe->dvb->device,
1706                                 "%s: Changing delivery system to %d\n",
1707                                 __func__, desired_system);
1708                         return 0;
1709                 }
1710                 ncaps++;
1711         }
1712
1713         /*
1714          * The requested delivery system isn't supported. Maybe userspace
1715          * is requesting a DVBv3 compatible delivery system.
1716          *
1717          * The emulation only works if the desired system is one of the
1718          * delivery systems supported by DVBv3 API
1719          */
1720         if (!is_dvbv3_delsys(desired_system)) {
1721                 dev_dbg(fe->dvb->device,
1722                         "%s: Delivery system %d not supported.\n",
1723                         __func__, desired_system);
1724                 return -EINVAL;
1725         }
1726
1727         type = dvbv3_type(desired_system);
1728
1729         /*
1730         * Get the last non-DVBv3 delivery system that has the same type
1731         * of the desired system
1732         */
1733         ncaps = 0;
1734         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1735                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1736                         delsys = fe->ops.delsys[ncaps];
1737                 ncaps++;
1738         }
1739
1740         /* There's nothing compatible with the desired delivery system */
1741         if (delsys == SYS_UNDEFINED) {
1742                 dev_dbg(fe->dvb->device,
1743                         "%s: Delivery system %d not supported on emulation mode.\n",
1744                         __func__, desired_system);
1745                 return -EINVAL;
1746         }
1747
1748         dev_dbg(fe->dvb->device,
1749                 "%s: Using delivery system %d emulated as if it were %d\n",
1750                 __func__, delsys, desired_system);
1751
1752         return emulate_delivery_system(fe, desired_system);
1753 }
1754
1755 /**
1756  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1757  * @fe: frontend struct
1758  *
1759  * A DVBv3 call doesn't know what's the desired system it wants. It also
1760  * doesn't allow to switch between different types. Due to that, userspace
1761  * should use DVBv5 instead.
1762  * However, in order to avoid breaking userspace API, limited backward
1763  * compatibility support is provided.
1764  *
1765  * There are some delivery systems that are incompatible with DVBv3 calls.
1766  *
1767  * This routine should work fine for frontends that support just one delivery
1768  * system.
1769  *
1770  * For frontends that support multiple frontends:
1771  * 1) It defaults to use the first supported delivery system. There's an
1772  *    userspace application that allows changing it at runtime;
1773  *
1774  * 2) If the current delivery system is not compatible with DVBv3, it gets
1775  *    the first one that it is compatible.
1776  *
1777  * NOTE: in order for this to work with applications like Kaffeine that
1778  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1779  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1780  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1781  *      to DVB-S.
1782  */
1783 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1784 {
1785         int ncaps;
1786         u32 delsys = SYS_UNDEFINED;
1787         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1788
1789         /* If not set yet, defaults to the first supported delivery system */
1790         if (c->delivery_system == SYS_UNDEFINED)
1791                 c->delivery_system = fe->ops.delsys[0];
1792
1793         /*
1794          * Trivial case: just use the current one, if it already a DVBv3
1795          * delivery system
1796          */
1797         if (is_dvbv3_delsys(c->delivery_system)) {
1798                 dev_dbg(fe->dvb->device,
1799                         "%s: Using delivery system to %d\n",
1800                         __func__, c->delivery_system);
1801                 return 0;
1802         }
1803
1804         /*
1805          * Seek for the first delivery system that it is compatible with a
1806          * DVBv3 standard
1807          */
1808         ncaps = 0;
1809         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1810                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1811                         delsys = fe->ops.delsys[ncaps];
1812                         break;
1813                 }
1814                 ncaps++;
1815         }
1816         if (delsys == SYS_UNDEFINED) {
1817                 dev_dbg(fe->dvb->device,
1818                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1819                         __func__);
1820                 return -EINVAL;
1821         }
1822         return emulate_delivery_system(fe, delsys);
1823 }
1824
1825 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1826 {
1827         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1828         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1829         struct dvb_frontend_tune_settings fetunesettings = { 0 };
1830
1831         /* get frontend-specific tuning settings */
1832         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1833                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1834                 fepriv->max_drift = fetunesettings.max_drift;
1835                 fepriv->step_size = fetunesettings.step_size;
1836         } else {
1837                 /* default values */
1838                 switch (c->delivery_system) {
1839                 case SYS_DSS:
1840                 case SYS_DVBS:
1841                 case SYS_DVBS2:
1842                 case SYS_ISDBS:
1843                 case SYS_TURBO:
1844                 case SYS_DVBC_ANNEX_A:
1845                 case SYS_DVBC_ANNEX_C:
1846                         fepriv->min_delay = HZ / 20;
1847                         fepriv->step_size = c->symbol_rate / 16000;
1848                         fepriv->max_drift = c->symbol_rate / 2000;
1849                         break;
1850                 case SYS_DVBT:
1851                 case SYS_DVBT2:
1852                 case SYS_ISDBT:
1853                 case SYS_DTMB:
1854                         fepriv->min_delay = HZ / 20;
1855                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1856                         fepriv->max_drift = fepriv->step_size + 1;
1857                         break;
1858                 default:
1859                         /*
1860                          * FIXME: This sounds wrong! if freqency_stepsize is
1861                          * defined by the frontend, why not use it???
1862                          */
1863                         fepriv->min_delay = HZ / 20;
1864                         fepriv->step_size = 0; /* no zigzag */
1865                         fepriv->max_drift = 0;
1866                         break;
1867                 }
1868         }
1869         if (dvb_override_tune_delay > 0)
1870                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1871 }
1872
1873 /**
1874  * dtv_property_process_set -  Sets a single DTV property
1875  * @fe:         Pointer to &struct dvb_frontend
1876  * @file:       Pointer to &struct file
1877  * @cmd:        Digital TV command
1878  * @data:       An unsigned 32-bits number
1879  *
1880  * This routine assigns the property
1881  * value to the corresponding member of
1882  * &struct dtv_frontend_properties
1883  *
1884  * Returns:
1885  * Zero on success, negative errno on failure.
1886  */
1887 static int dtv_property_process_set(struct dvb_frontend *fe,
1888                                     struct file *file,
1889                                     u32 cmd, u32 data)
1890 {
1891         int r = 0;
1892         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1893
1894         /** Dump DTV command name and value*/
1895         if (!cmd || cmd > DTV_MAX_COMMAND)
1896                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1897                          __func__, cmd);
1898         else
1899                 dev_dbg(fe->dvb->device,
1900                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1901                         __func__, cmd, dtv_cmd_name(cmd), data);
1902         switch (cmd) {
1903         case DTV_CLEAR:
1904                 /*
1905                  * Reset a cache of data specific to the frontend here. This does
1906                  * not effect hardware.
1907                  */
1908                 dvb_frontend_clear_cache(fe);
1909                 break;
1910         case DTV_TUNE:
1911                 /*
1912                  * Use the cached Digital TV properties to tune the
1913                  * frontend
1914                  */
1915                 dev_dbg(fe->dvb->device,
1916                         "%s: Setting the frontend from property cache\n",
1917                         __func__);
1918
1919                 r = dtv_set_frontend(fe);
1920                 break;
1921         case DTV_FREQUENCY:
1922                 c->frequency = data;
1923                 break;
1924         case DTV_MODULATION:
1925                 c->modulation = data;
1926                 break;
1927         case DTV_BANDWIDTH_HZ:
1928                 c->bandwidth_hz = data;
1929                 break;
1930         case DTV_INVERSION:
1931                 c->inversion = data;
1932                 break;
1933         case DTV_SYMBOL_RATE:
1934                 c->symbol_rate = data;
1935                 break;
1936         case DTV_INNER_FEC:
1937                 c->fec_inner = data;
1938                 break;
1939         case DTV_PILOT:
1940                 c->pilot = data;
1941                 break;
1942         case DTV_ROLLOFF:
1943                 c->rolloff = data;
1944                 break;
1945         case DTV_DELIVERY_SYSTEM:
1946                 r = dvbv5_set_delivery_system(fe, data);
1947                 break;
1948         case DTV_VOLTAGE:
1949                 c->voltage = data;
1950                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1951                                               (void *)c->voltage);
1952                 break;
1953         case DTV_TONE:
1954                 c->sectone = data;
1955                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1956                                               (void *)c->sectone);
1957                 break;
1958         case DTV_CODE_RATE_HP:
1959                 c->code_rate_HP = data;
1960                 break;
1961         case DTV_CODE_RATE_LP:
1962                 c->code_rate_LP = data;
1963                 break;
1964         case DTV_GUARD_INTERVAL:
1965                 c->guard_interval = data;
1966                 break;
1967         case DTV_TRANSMISSION_MODE:
1968                 c->transmission_mode = data;
1969                 break;
1970         case DTV_HIERARCHY:
1971                 c->hierarchy = data;
1972                 break;
1973         case DTV_INTERLEAVING:
1974                 c->interleaving = data;
1975                 break;
1976
1977         /* ISDB-T Support here */
1978         case DTV_ISDBT_PARTIAL_RECEPTION:
1979                 c->isdbt_partial_reception = data;
1980                 break;
1981         case DTV_ISDBT_SOUND_BROADCASTING:
1982                 c->isdbt_sb_mode = data;
1983                 break;
1984         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1985                 c->isdbt_sb_subchannel = data;
1986                 break;
1987         case DTV_ISDBT_SB_SEGMENT_IDX:
1988                 c->isdbt_sb_segment_idx = data;
1989                 break;
1990         case DTV_ISDBT_SB_SEGMENT_COUNT:
1991                 c->isdbt_sb_segment_count = data;
1992                 break;
1993         case DTV_ISDBT_LAYER_ENABLED:
1994                 c->isdbt_layer_enabled = data;
1995                 break;
1996         case DTV_ISDBT_LAYERA_FEC:
1997                 c->layer[0].fec = data;
1998                 break;
1999         case DTV_ISDBT_LAYERA_MODULATION:
2000                 c->layer[0].modulation = data;
2001                 break;
2002         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
2003                 c->layer[0].segment_count = data;
2004                 break;
2005         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
2006                 c->layer[0].interleaving = data;
2007                 break;
2008         case DTV_ISDBT_LAYERB_FEC:
2009                 c->layer[1].fec = data;
2010                 break;
2011         case DTV_ISDBT_LAYERB_MODULATION:
2012                 c->layer[1].modulation = data;
2013                 break;
2014         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2015                 c->layer[1].segment_count = data;
2016                 break;
2017         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2018                 c->layer[1].interleaving = data;
2019                 break;
2020         case DTV_ISDBT_LAYERC_FEC:
2021                 c->layer[2].fec = data;
2022                 break;
2023         case DTV_ISDBT_LAYERC_MODULATION:
2024                 c->layer[2].modulation = data;
2025                 break;
2026         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2027                 c->layer[2].segment_count = data;
2028                 break;
2029         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2030                 c->layer[2].interleaving = data;
2031                 break;
2032
2033         /* Multistream support */
2034         case DTV_STREAM_ID:
2035         case DTV_DVBT2_PLP_ID_LEGACY:
2036                 c->stream_id = data;
2037                 break;
2038
2039         /* Physical layer scrambling support */
2040         case DTV_SCRAMBLING_SEQUENCE_INDEX:
2041                 c->scrambling_sequence_index = data;
2042                 break;
2043
2044         /* ATSC-MH */
2045         case DTV_ATSCMH_PARADE_ID:
2046                 fe->dtv_property_cache.atscmh_parade_id = data;
2047                 break;
2048         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2049                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2050                 break;
2051
2052         case DTV_LNA:
2053                 c->lna = data;
2054                 if (fe->ops.set_lna)
2055                         r = fe->ops.set_lna(fe);
2056                 if (r < 0)
2057                         c->lna = LNA_AUTO;
2058                 break;
2059
2060         default:
2061                 return -EINVAL;
2062         }
2063
2064         return r;
2065 }
2066
2067 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2068                                  void *parg)
2069 {
2070         struct dvb_device *dvbdev = file->private_data;
2071         struct dvb_frontend *fe = dvbdev->priv;
2072         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2073         int err;
2074
2075         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2076         if (down_interruptible(&fepriv->sem))
2077                 return -ERESTARTSYS;
2078
2079         if (fe->exit != DVB_FE_NO_EXIT) {
2080                 up(&fepriv->sem);
2081                 return -ENODEV;
2082         }
2083
2084         /*
2085          * If the frontend is opened in read-only mode, only the ioctls
2086          * that don't interfere with the tune logic should be accepted.
2087          * That allows an external application to monitor the DVB QoS and
2088          * statistics parameters.
2089          *
2090          * That matches all _IOR() ioctls, except for two special cases:
2091          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2092          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2093          *     setup
2094          * So, those two ioctls should also return -EPERM, as otherwise
2095          * reading from them would interfere with a DVB tune application
2096          */
2097         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2098             && (_IOC_DIR(cmd) != _IOC_READ
2099                 || cmd == FE_GET_EVENT
2100                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2101                 up(&fepriv->sem);
2102                 return -EPERM;
2103         }
2104
2105         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2106
2107         up(&fepriv->sem);
2108         return err;
2109 }
2110
2111 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2112                                unsigned long arg)
2113 {
2114         struct dvb_device *dvbdev = file->private_data;
2115
2116         if (!dvbdev)
2117                 return -ENODEV;
2118
2119         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2120 }
2121
2122 #ifdef CONFIG_COMPAT
2123 struct compat_dtv_property {
2124         __u32 cmd;
2125         __u32 reserved[3];
2126         union {
2127                 __u32 data;
2128                 struct dtv_fe_stats st;
2129                 struct {
2130                         __u8 data[32];
2131                         __u32 len;
2132                         __u32 reserved1[3];
2133                         compat_uptr_t reserved2;
2134                 } buffer;
2135         } u;
2136         int result;
2137 } __attribute__ ((packed));
2138
2139 struct compat_dtv_properties {
2140         __u32 num;
2141         compat_uptr_t props;
2142 };
2143
2144 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2145 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2146
2147 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2148                                             unsigned long arg)
2149 {
2150         struct dvb_device *dvbdev = file->private_data;
2151         struct dvb_frontend *fe = dvbdev->priv;
2152         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2153         int i, err = 0;
2154
2155         if (cmd == COMPAT_FE_SET_PROPERTY) {
2156                 struct compat_dtv_properties prop, *tvps = NULL;
2157                 struct compat_dtv_property *tvp = NULL;
2158
2159                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2160                         return -EFAULT;
2161
2162                 tvps = &prop;
2163
2164                 /*
2165                  * Put an arbitrary limit on the number of messages that can
2166                  * be sent at once
2167                  */
2168                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2169                         return -EINVAL;
2170
2171                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2172                 if (IS_ERR(tvp))
2173                         return PTR_ERR(tvp);
2174
2175                 for (i = 0; i < tvps->num; i++) {
2176                         err = dtv_property_process_set(fe, file,
2177                                                        (tvp + i)->cmd,
2178                                                        (tvp + i)->u.data);
2179                         if (err < 0) {
2180                                 kfree(tvp);
2181                                 return err;
2182                         }
2183                 }
2184                 kfree(tvp);
2185         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2186                 struct compat_dtv_properties prop, *tvps = NULL;
2187                 struct compat_dtv_property *tvp = NULL;
2188                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2189
2190                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2191                         return -EFAULT;
2192
2193                 tvps = &prop;
2194
2195                 /*
2196                  * Put an arbitrary limit on the number of messages that can
2197                  * be sent at once
2198                  */
2199                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2200                         return -EINVAL;
2201
2202                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2203                 if (IS_ERR(tvp))
2204                         return PTR_ERR(tvp);
2205
2206                 /*
2207                  * Let's use our own copy of property cache, in order to
2208                  * avoid mangling with DTV zigzag logic, as drivers might
2209                  * return crap, if they don't check if the data is available
2210                  * before updating the properties cache.
2211                  */
2212                 if (fepriv->state != FESTATE_IDLE) {
2213                         err = dtv_get_frontend(fe, &getp, NULL);
2214                         if (err < 0) {
2215                                 kfree(tvp);
2216                                 return err;
2217                         }
2218                 }
2219                 for (i = 0; i < tvps->num; i++) {
2220                         err = dtv_property_process_get(
2221                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2222                         if (err < 0) {
2223                                 kfree(tvp);
2224                                 return err;
2225                         }
2226                 }
2227
2228                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2229                                  tvps->num * sizeof(struct compat_dtv_property))) {
2230                         kfree(tvp);
2231                         return -EFAULT;
2232                 }
2233                 kfree(tvp);
2234         }
2235
2236         return err;
2237 }
2238
2239 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2240                                       unsigned long arg)
2241 {
2242         struct dvb_device *dvbdev = file->private_data;
2243         struct dvb_frontend *fe = dvbdev->priv;
2244         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2245         int err;
2246
2247         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2248                 if (down_interruptible(&fepriv->sem))
2249                         return -ERESTARTSYS;
2250
2251                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2252
2253                 up(&fepriv->sem);
2254                 return err;
2255         }
2256
2257         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2258 }
2259 #endif
2260
2261 static int dtv_set_frontend(struct dvb_frontend *fe)
2262 {
2263         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2264         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2265         u32 rolloff = 0;
2266
2267         if (dvb_frontend_check_parameters(fe) < 0)
2268                 return -EINVAL;
2269
2270         /*
2271          * Initialize output parameters to match the values given by
2272          * the user. FE_SET_FRONTEND triggers an initial frontend event
2273          * with status = 0, which copies output parameters to userspace.
2274          */
2275         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2276
2277         /*
2278          * Be sure that the bandwidth will be filled for all
2279          * non-satellite systems, as tuners need to know what
2280          * low pass/Nyquist half filter should be applied, in
2281          * order to avoid inter-channel noise.
2282          *
2283          * ISDB-T and DVB-T/T2 already sets bandwidth.
2284          * ATSC and DVB-C don't set, so, the core should fill it.
2285          *
2286          * On DVB-C Annex A and C, the bandwidth is a function of
2287          * the roll-off and symbol rate. Annex B defines different
2288          * roll-off factors depending on the modulation. Fortunately,
2289          * Annex B is only used with 6MHz, so there's no need to
2290          * calculate it.
2291          *
2292          * While not officially supported, a side effect of handling it at
2293          * the cache level is that a program could retrieve the bandwidth
2294          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2295          */
2296         switch (c->delivery_system) {
2297         case SYS_ATSC:
2298         case SYS_DVBC_ANNEX_B:
2299                 c->bandwidth_hz = 6000000;
2300                 break;
2301         case SYS_DVBC_ANNEX_A:
2302                 rolloff = 115;
2303                 break;
2304         case SYS_DVBC_ANNEX_C:
2305                 rolloff = 113;
2306                 break;
2307         case SYS_DSS:
2308                 rolloff = 120;
2309                 break;
2310         case SYS_DVBS:
2311         case SYS_TURBO:
2312         case SYS_ISDBS:
2313                 rolloff = 135;
2314                 break;
2315         case SYS_DVBS2:
2316                 switch (c->rolloff) {
2317                 case ROLLOFF_20:
2318                         rolloff = 120;
2319                         break;
2320                 case ROLLOFF_25:
2321                         rolloff = 125;
2322                         break;
2323                 default:
2324                 case ROLLOFF_35:
2325                         rolloff = 135;
2326                 }
2327                 break;
2328         default:
2329                 break;
2330         }
2331         if (rolloff)
2332                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2333
2334         /* force auto frequency inversion if requested */
2335         if (dvb_force_auto_inversion)
2336                 c->inversion = INVERSION_AUTO;
2337
2338         /*
2339          * without hierarchical coding code_rate_LP is irrelevant,
2340          * so we tolerate the otherwise invalid FEC_NONE setting
2341          */
2342         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2343                 c->code_rate_LP = FEC_AUTO;
2344
2345         prepare_tuning_algo_parameters(fe);
2346
2347         fepriv->state = FESTATE_RETUNE;
2348
2349         /* Request the search algorithm to search */
2350         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2351
2352         dvb_frontend_clear_events(fe);
2353         dvb_frontend_add_event(fe, 0);
2354         dvb_frontend_wakeup(fe);
2355         fepriv->status = 0;
2356
2357         return 0;
2358 }
2359
2360 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2361                             struct dtv_properties *tvps)
2362 {
2363         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2364         struct dtv_property *tvp = NULL;
2365         struct dtv_frontend_properties getp;
2366         int i, err;
2367
2368         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2369
2370         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2371                 __func__, tvps->num);
2372         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2373                 __func__, tvps->props);
2374
2375         /*
2376          * Put an arbitrary limit on the number of messages that can
2377          * be sent at once
2378          */
2379         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2380                 return -EINVAL;
2381
2382         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2383         if (IS_ERR(tvp))
2384                 return PTR_ERR(tvp);
2385
2386         /*
2387          * Let's use our own copy of property cache, in order to
2388          * avoid mangling with DTV zigzag logic, as drivers might
2389          * return crap, if they don't check if the data is available
2390          * before updating the properties cache.
2391          */
2392         if (fepriv->state != FESTATE_IDLE) {
2393                 err = dtv_get_frontend(fe, &getp, NULL);
2394                 if (err < 0)
2395                         goto out;
2396         }
2397         for (i = 0; i < tvps->num; i++) {
2398                 err = dtv_property_process_get(fe, &getp,
2399                                                tvp + i, file);
2400                 if (err < 0)
2401                         goto out;
2402         }
2403
2404         if (copy_to_user((void __user *)tvps->props, tvp,
2405                          tvps->num * sizeof(struct dtv_property))) {
2406                 err = -EFAULT;
2407                 goto out;
2408         }
2409
2410         err = 0;
2411 out:
2412         kfree(tvp);
2413         return err;
2414 }
2415
2416 static int dvb_get_frontend(struct dvb_frontend *fe,
2417                             struct dvb_frontend_parameters *p_out)
2418 {
2419         struct dtv_frontend_properties getp;
2420
2421         /*
2422          * Let's use our own copy of property cache, in order to
2423          * avoid mangling with DTV zigzag logic, as drivers might
2424          * return crap, if they don't check if the data is available
2425          * before updating the properties cache.
2426          */
2427         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2428
2429         return dtv_get_frontend(fe, &getp, p_out);
2430 }
2431
2432 static int dvb_frontend_handle_ioctl(struct file *file,
2433                                      unsigned int cmd, void *parg)
2434 {
2435         struct dvb_device *dvbdev = file->private_data;
2436         struct dvb_frontend *fe = dvbdev->priv;
2437         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2438         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2439         int i, err = -ENOTSUPP;
2440
2441         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2442
2443         switch (cmd) {
2444         case FE_SET_PROPERTY: {
2445                 struct dtv_properties *tvps = parg;
2446                 struct dtv_property *tvp = NULL;
2447
2448                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2449                         __func__, tvps->num);
2450                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2451                         __func__, tvps->props);
2452
2453                 /*
2454                  * Put an arbitrary limit on the number of messages that can
2455                  * be sent at once
2456                  */
2457                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2458                         return -EINVAL;
2459
2460                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2461                 if (IS_ERR(tvp))
2462                         return PTR_ERR(tvp);
2463
2464                 for (i = 0; i < tvps->num; i++) {
2465                         err = dtv_property_process_set(fe, file,
2466                                                        (tvp + i)->cmd,
2467                                                        (tvp + i)->u.data);
2468                         if (err < 0) {
2469                                 kfree(tvp);
2470                                 return err;
2471                         }
2472                 }
2473                 kfree(tvp);
2474                 err = 0;
2475                 break;
2476         }
2477         case FE_GET_PROPERTY:
2478                 err = dvb_get_property(fe, file, parg);
2479                 break;
2480
2481         case FE_GET_INFO: {
2482                 struct dvb_frontend_info *info = parg;
2483                 memset(info, 0, sizeof(*info));
2484
2485                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2486                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2487                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2488                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2489                 info->caps = fe->ops.info.caps;
2490                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2491                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2492                                                   &info->frequency_max,
2493                                                   &info->frequency_tolerance);
2494
2495                 /*
2496                  * Associate the 4 delivery systems supported by DVBv3
2497                  * API with their DVBv5 counterpart. For the other standards,
2498                  * use the closest type, assuming that it would hopefully
2499                  * work with a DVBv3 application.
2500                  * It should be noticed that, on multi-frontend devices with
2501                  * different types (terrestrial and cable, for example),
2502                  * a pure DVBv3 application won't be able to use all delivery
2503                  * systems. Yet, changing the DVBv5 cache to the other delivery
2504                  * system should be enough for making it work.
2505                  */
2506                 switch (dvbv3_type(c->delivery_system)) {
2507                 case DVBV3_QPSK:
2508                         info->type = FE_QPSK;
2509                         break;
2510                 case DVBV3_ATSC:
2511                         info->type = FE_ATSC;
2512                         break;
2513                 case DVBV3_QAM:
2514                         info->type = FE_QAM;
2515                         break;
2516                 case DVBV3_OFDM:
2517                         info->type = FE_OFDM;
2518                         break;
2519                 default:
2520                         dev_err(fe->dvb->device,
2521                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2522                                 __func__, c->delivery_system);
2523                         info->type = FE_OFDM;
2524                 }
2525                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2526                         __func__, c->delivery_system, info->type);
2527
2528                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2529                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2530                         info->caps |= FE_CAN_INVERSION_AUTO;
2531                 err = 0;
2532                 break;
2533         }
2534
2535         case FE_READ_STATUS: {
2536                 enum fe_status *status = parg;
2537
2538                 /* if retune was requested but hasn't occurred yet, prevent
2539                  * that user get signal state from previous tuning */
2540                 if (fepriv->state == FESTATE_RETUNE ||
2541                     fepriv->state == FESTATE_ERROR) {
2542                         err = 0;
2543                         *status = 0;
2544                         break;
2545                 }
2546
2547                 if (fe->ops.read_status)
2548                         err = fe->ops.read_status(fe, status);
2549                 break;
2550         }
2551
2552         case FE_DISEQC_RESET_OVERLOAD:
2553                 if (fe->ops.diseqc_reset_overload) {
2554                         err = fe->ops.diseqc_reset_overload(fe);
2555                         fepriv->state = FESTATE_DISEQC;
2556                         fepriv->status = 0;
2557                 }
2558                 break;
2559
2560         case FE_DISEQC_SEND_MASTER_CMD:
2561                 if (fe->ops.diseqc_send_master_cmd) {
2562                         struct dvb_diseqc_master_cmd *cmd = parg;
2563
2564                         if (cmd->msg_len > sizeof(cmd->msg)) {
2565                                 err = -EINVAL;
2566                                 break;
2567                         }
2568                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2569                         fepriv->state = FESTATE_DISEQC;
2570                         fepriv->status = 0;
2571                 }
2572                 break;
2573
2574         case FE_DISEQC_SEND_BURST:
2575                 if (fe->ops.diseqc_send_burst) {
2576                         err = fe->ops.diseqc_send_burst(fe, (long)parg);
2577                         fepriv->state = FESTATE_DISEQC;
2578                         fepriv->status = 0;
2579                 }
2580                 break;
2581
2582         case FE_SET_TONE:
2583                 if (fe->ops.set_tone) {
2584                         fepriv->tone = (long)parg;
2585                         err = fe->ops.set_tone(fe, fepriv->tone);
2586                         fepriv->state = FESTATE_DISEQC;
2587                         fepriv->status = 0;
2588                 }
2589                 break;
2590
2591         case FE_SET_VOLTAGE:
2592                 if (fe->ops.set_voltage) {
2593                         fepriv->voltage = (long)parg;
2594                         err = fe->ops.set_voltage(fe, fepriv->voltage);
2595                         fepriv->state = FESTATE_DISEQC;
2596                         fepriv->status = 0;
2597                 }
2598                 break;
2599
2600         case FE_DISEQC_RECV_SLAVE_REPLY:
2601                 if (fe->ops.diseqc_recv_slave_reply)
2602                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2603                 break;
2604
2605         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2606                 if (fe->ops.enable_high_lnb_voltage)
2607                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2608                 break;
2609
2610         case FE_SET_FRONTEND_TUNE_MODE:
2611                 fepriv->tune_mode_flags = (unsigned long)parg;
2612                 err = 0;
2613                 break;
2614         /* DEPRECATED dish control ioctls */
2615
2616         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2617                 if (fe->ops.dishnetwork_send_legacy_command) {
2618                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2619                                                          (unsigned long)parg);
2620                         fepriv->state = FESTATE_DISEQC;
2621                         fepriv->status = 0;
2622                 } else if (fe->ops.set_voltage) {
2623                         /*
2624                          * NOTE: This is a fallback condition.  Some frontends
2625                          * (stv0299 for instance) take longer than 8msec to
2626                          * respond to a set_voltage command.  Those switches
2627                          * need custom routines to switch properly.  For all
2628                          * other frontends, the following should work ok.
2629                          * Dish network legacy switches (as used by Dish500)
2630                          * are controlled by sending 9-bit command words
2631                          * spaced 8msec apart.
2632                          * the actual command word is switch/port dependent
2633                          * so it is up to the userspace application to send
2634                          * the right command.
2635                          * The command must always start with a '0' after
2636                          * initialization, so parg is 8 bits and does not
2637                          * include the initialization or start bit
2638                          */
2639                         unsigned long swcmd = ((unsigned long)parg) << 1;
2640                         ktime_t nexttime;
2641                         ktime_t tv[10];
2642                         int i;
2643                         u8 last = 1;
2644
2645                         if (dvb_frontend_debug)
2646                                 dprintk("switch command: 0x%04lx\n",
2647                                         swcmd);
2648                         nexttime = ktime_get_boottime();
2649                         if (dvb_frontend_debug)
2650                                 tv[0] = nexttime;
2651                         /* before sending a command, initialize by sending
2652                          * a 32ms 18V to the switch
2653                          */
2654                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2655                         dvb_frontend_sleep_until(&nexttime, 32000);
2656
2657                         for (i = 0; i < 9; i++) {
2658                                 if (dvb_frontend_debug)
2659                                         tv[i + 1] = ktime_get_boottime();
2660                                 if ((swcmd & 0x01) != last) {
2661                                         /* set voltage to (last ? 13V : 18V) */
2662                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2663                                         last = (last) ? 0 : 1;
2664                                 }
2665                                 swcmd = swcmd >> 1;
2666                                 if (i != 8)
2667                                         dvb_frontend_sleep_until(&nexttime, 8000);
2668                         }
2669                         if (dvb_frontend_debug) {
2670                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2671                                         fe->dvb->num);
2672                                 for (i = 1; i < 10; i++)
2673                                         pr_info("%d: %d\n", i,
2674                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2675                         }
2676                         err = 0;
2677                         fepriv->state = FESTATE_DISEQC;
2678                         fepriv->status = 0;
2679                 }
2680                 break;
2681
2682         /* DEPRECATED statistics ioctls */
2683
2684         case FE_READ_BER:
2685                 if (fe->ops.read_ber) {
2686                         if (fepriv->thread)
2687                                 err = fe->ops.read_ber(fe, parg);
2688                         else
2689                                 err = -EAGAIN;
2690                 }
2691                 break;
2692
2693         case FE_READ_SIGNAL_STRENGTH:
2694                 if (fe->ops.read_signal_strength) {
2695                         if (fepriv->thread)
2696                                 err = fe->ops.read_signal_strength(fe, parg);
2697                         else
2698                                 err = -EAGAIN;
2699                 }
2700                 break;
2701
2702         case FE_READ_SNR:
2703                 if (fe->ops.read_snr) {
2704                         if (fepriv->thread)
2705                                 err = fe->ops.read_snr(fe, parg);
2706                         else
2707                                 err = -EAGAIN;
2708                 }
2709                 break;
2710
2711         case FE_READ_UNCORRECTED_BLOCKS:
2712                 if (fe->ops.read_ucblocks) {
2713                         if (fepriv->thread)
2714                                 err = fe->ops.read_ucblocks(fe, parg);
2715                         else
2716                                 err = -EAGAIN;
2717                 }
2718                 break;
2719
2720         /* DEPRECATED DVBv3 ioctls */
2721
2722         case FE_SET_FRONTEND:
2723                 err = dvbv3_set_delivery_system(fe);
2724                 if (err)
2725                         break;
2726
2727                 err = dtv_property_cache_sync(fe, c, parg);
2728                 if (err)
2729                         break;
2730                 err = dtv_set_frontend(fe);
2731                 break;
2732
2733         case FE_GET_EVENT:
2734                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2735                 break;
2736
2737         case FE_GET_FRONTEND:
2738                 err = dvb_get_frontend(fe, parg);
2739                 break;
2740
2741         default:
2742                 return -ENOTSUPP;
2743         } /* switch */
2744
2745         return err;
2746 }
2747
2748 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2749 {
2750         struct dvb_device *dvbdev = file->private_data;
2751         struct dvb_frontend *fe = dvbdev->priv;
2752         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2753
2754         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2755
2756         poll_wait(file, &fepriv->events.wait_queue, wait);
2757
2758         if (fepriv->events.eventw != fepriv->events.eventr)
2759                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2760
2761         return 0;
2762 }
2763
2764 static int dvb_frontend_open(struct inode *inode, struct file *file)
2765 {
2766         struct dvb_device *dvbdev = file->private_data;
2767         struct dvb_frontend *fe = dvbdev->priv;
2768         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2769         struct dvb_adapter *adapter = fe->dvb;
2770         int ret;
2771
2772         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2773         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2774                 return -ENODEV;
2775
2776         if (adapter->mfe_shared == 2) {
2777                 mutex_lock(&adapter->mfe_lock);
2778                 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2779                         if (adapter->mfe_dvbdev &&
2780                             !adapter->mfe_dvbdev->writers) {
2781                                 mutex_unlock(&adapter->mfe_lock);
2782                                 return -EBUSY;
2783                         }
2784                         adapter->mfe_dvbdev = dvbdev;
2785                 }
2786         } else if (adapter->mfe_shared) {
2787                 mutex_lock(&adapter->mfe_lock);
2788
2789                 if (!adapter->mfe_dvbdev)
2790                         adapter->mfe_dvbdev = dvbdev;
2791
2792                 else if (adapter->mfe_dvbdev != dvbdev) {
2793                         struct dvb_device
2794                                 *mfedev = adapter->mfe_dvbdev;
2795                         struct dvb_frontend
2796                                 *mfe = mfedev->priv;
2797                         struct dvb_frontend_private
2798                                 *mfepriv = mfe->frontend_priv;
2799                         int mferetry = (dvb_mfe_wait_time << 1);
2800
2801                         mutex_unlock(&adapter->mfe_lock);
2802                         while (mferetry-- && (mfedev->users != -1 ||
2803                                               mfepriv->thread)) {
2804                                 if (msleep_interruptible(500)) {
2805                                         if (signal_pending(current))
2806                                                 return -EINTR;
2807                                 }
2808                         }
2809
2810                         mutex_lock(&adapter->mfe_lock);
2811                         if (adapter->mfe_dvbdev != dvbdev) {
2812                                 mfedev = adapter->mfe_dvbdev;
2813                                 mfe = mfedev->priv;
2814                                 mfepriv = mfe->frontend_priv;
2815                                 if (mfedev->users != -1 ||
2816                                     mfepriv->thread) {
2817                                         mutex_unlock(&adapter->mfe_lock);
2818                                         return -EBUSY;
2819                                 }
2820                                 adapter->mfe_dvbdev = dvbdev;
2821                         }
2822                 }
2823         }
2824
2825         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2826                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2827                         goto err0;
2828
2829                 /* If we took control of the bus, we need to force
2830                    reinitialization.  This is because many ts_bus_ctrl()
2831                    functions strobe the RESET pin on the demod, and if the
2832                    frontend thread already exists then the dvb_init() routine
2833                    won't get called (which is what usually does initial
2834                    register configuration). */
2835                 fepriv->reinitialise = 1;
2836         }
2837
2838         if ((ret = dvb_generic_open(inode, file)) < 0)
2839                 goto err1;
2840
2841         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2842                 /* normal tune mode when opened R/W */
2843                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2844                 fepriv->tone = -1;
2845                 fepriv->voltage = -1;
2846
2847 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2848                 mutex_lock(&fe->dvb->mdev_lock);
2849                 if (fe->dvb->mdev) {
2850                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2851                         if (fe->dvb->mdev->enable_source)
2852                                 ret = fe->dvb->mdev->enable_source(
2853                                                            dvbdev->entity,
2854                                                            &fepriv->pipe);
2855                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2856                         if (ret) {
2857                                 mutex_unlock(&fe->dvb->mdev_lock);
2858                                 dev_err(fe->dvb->device,
2859                                         "Tuner is busy. Error %d\n", ret);
2860                                 goto err2;
2861                         }
2862                 }
2863                 mutex_unlock(&fe->dvb->mdev_lock);
2864 #endif
2865                 ret = dvb_frontend_start(fe);
2866                 if (ret)
2867                         goto err3;
2868
2869                 /*  empty event queue */
2870                 fepriv->events.eventr = fepriv->events.eventw = 0;
2871         }
2872
2873         dvb_frontend_get(fe);
2874
2875         if (adapter->mfe_shared)
2876                 mutex_unlock(&adapter->mfe_lock);
2877         return ret;
2878
2879 err3:
2880 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2881         mutex_lock(&fe->dvb->mdev_lock);
2882         if (fe->dvb->mdev) {
2883                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2884                 if (fe->dvb->mdev->disable_source)
2885                         fe->dvb->mdev->disable_source(dvbdev->entity);
2886                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2887         }
2888         mutex_unlock(&fe->dvb->mdev_lock);
2889 err2:
2890 #endif
2891         dvb_generic_release(inode, file);
2892 err1:
2893         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2894                 fe->ops.ts_bus_ctrl(fe, 0);
2895 err0:
2896         if (adapter->mfe_shared)
2897                 mutex_unlock(&adapter->mfe_lock);
2898         return ret;
2899 }
2900
2901 static int dvb_frontend_release(struct inode *inode, struct file *file)
2902 {
2903         struct dvb_device *dvbdev = file->private_data;
2904         struct dvb_frontend *fe = dvbdev->priv;
2905         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2906         int ret;
2907
2908         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2909
2910         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2911                 fepriv->release_jiffies = jiffies;
2912                 mb();
2913         }
2914
2915         ret = dvb_generic_release(inode, file);
2916
2917         if (dvbdev->users == -1) {
2918                 wake_up(&fepriv->wait_queue);
2919 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2920                 mutex_lock(&fe->dvb->mdev_lock);
2921                 if (fe->dvb->mdev) {
2922                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2923                         if (fe->dvb->mdev->disable_source)
2924                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2925                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2926                 }
2927                 mutex_unlock(&fe->dvb->mdev_lock);
2928 #endif
2929                 if (fe->exit != DVB_FE_NO_EXIT)
2930                         wake_up(&dvbdev->wait_queue);
2931                 if (fe->ops.ts_bus_ctrl)
2932                         fe->ops.ts_bus_ctrl(fe, 0);
2933         }
2934
2935         dvb_frontend_put(fe);
2936
2937         return ret;
2938 }
2939
2940 static const struct file_operations dvb_frontend_fops = {
2941         .owner          = THIS_MODULE,
2942         .unlocked_ioctl = dvb_frontend_ioctl,
2943 #ifdef CONFIG_COMPAT
2944         .compat_ioctl   = dvb_frontend_compat_ioctl,
2945 #endif
2946         .poll           = dvb_frontend_poll,
2947         .open           = dvb_frontend_open,
2948         .release        = dvb_frontend_release,
2949         .llseek         = noop_llseek,
2950 };
2951
2952 int dvb_frontend_suspend(struct dvb_frontend *fe)
2953 {
2954         int ret = 0;
2955
2956         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2957                 fe->id);
2958
2959         if (fe->ops.tuner_ops.suspend)
2960                 ret = fe->ops.tuner_ops.suspend(fe);
2961         else if (fe->ops.tuner_ops.sleep)
2962                 ret = fe->ops.tuner_ops.sleep(fe);
2963
2964         if (fe->ops.suspend)
2965                 ret = fe->ops.suspend(fe);
2966         else if (fe->ops.sleep)
2967                 ret = fe->ops.sleep(fe);
2968
2969         return ret;
2970 }
2971 EXPORT_SYMBOL(dvb_frontend_suspend);
2972
2973 int dvb_frontend_resume(struct dvb_frontend *fe)
2974 {
2975         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2976         int ret = 0;
2977
2978         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2979                 fe->id);
2980
2981         fe->exit = DVB_FE_DEVICE_RESUME;
2982         if (fe->ops.resume)
2983                 ret = fe->ops.resume(fe);
2984         else if (fe->ops.init)
2985                 ret = fe->ops.init(fe);
2986
2987         if (fe->ops.tuner_ops.resume)
2988                 ret = fe->ops.tuner_ops.resume(fe);
2989         else if (fe->ops.tuner_ops.init)
2990                 ret = fe->ops.tuner_ops.init(fe);
2991
2992         if (fe->ops.set_tone && fepriv->tone != -1)
2993                 fe->ops.set_tone(fe, fepriv->tone);
2994         if (fe->ops.set_voltage && fepriv->voltage != -1)
2995                 fe->ops.set_voltage(fe, fepriv->voltage);
2996
2997         fe->exit = DVB_FE_NO_EXIT;
2998         fepriv->state = FESTATE_RETUNE;
2999         dvb_frontend_wakeup(fe);
3000
3001         return ret;
3002 }
3003 EXPORT_SYMBOL(dvb_frontend_resume);
3004
3005 int dvb_register_frontend(struct dvb_adapter *dvb,
3006                           struct dvb_frontend *fe)
3007 {
3008         struct dvb_frontend_private *fepriv;
3009         const struct dvb_device dvbdev_template = {
3010                 .users = ~0,
3011                 .writers = 1,
3012                 .readers = (~0) - 1,
3013                 .fops = &dvb_frontend_fops,
3014 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3015                 .name = fe->ops.info.name,
3016 #endif
3017         };
3018         int ret;
3019
3020         dev_dbg(dvb->device, "%s:\n", __func__);
3021
3022         if (mutex_lock_interruptible(&frontend_mutex))
3023                 return -ERESTARTSYS;
3024
3025         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3026         if (!fe->frontend_priv) {
3027                 mutex_unlock(&frontend_mutex);
3028                 return -ENOMEM;
3029         }
3030         fepriv = fe->frontend_priv;
3031
3032         kref_init(&fe->refcount);
3033
3034         /*
3035          * After initialization, there need to be two references: one
3036          * for dvb_unregister_frontend(), and another one for
3037          * dvb_frontend_detach().
3038          */
3039         dvb_frontend_get(fe);
3040
3041         sema_init(&fepriv->sem, 1);
3042         init_waitqueue_head(&fepriv->wait_queue);
3043         init_waitqueue_head(&fepriv->events.wait_queue);
3044         mutex_init(&fepriv->events.mtx);
3045         fe->dvb = dvb;
3046         fepriv->inversion = INVERSION_OFF;
3047
3048         dev_info(fe->dvb->device,
3049                  "DVB: registering adapter %i frontend %i (%s)...\n",
3050                  fe->dvb->num, fe->id, fe->ops.info.name);
3051
3052         ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3053                             fe, DVB_DEVICE_FRONTEND, 0);
3054         if (ret) {
3055                 dvb_frontend_put(fe);
3056                 mutex_unlock(&frontend_mutex);
3057                 return ret;
3058         }
3059
3060         /*
3061          * Initialize the cache to the proper values according with the
3062          * first supported delivery system (ops->delsys[0])
3063          */
3064
3065         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3066         dvb_frontend_clear_cache(fe);
3067
3068         mutex_unlock(&frontend_mutex);
3069         return 0;
3070 }
3071 EXPORT_SYMBOL(dvb_register_frontend);
3072
3073 int dvb_unregister_frontend(struct dvb_frontend *fe)
3074 {
3075         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3076
3077         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3078
3079         mutex_lock(&frontend_mutex);
3080         dvb_frontend_stop(fe);
3081         dvb_remove_device(fepriv->dvbdev);
3082
3083         /* fe is invalid now */
3084         mutex_unlock(&frontend_mutex);
3085         dvb_frontend_put(fe);
3086         return 0;
3087 }
3088 EXPORT_SYMBOL(dvb_unregister_frontend);
3089
3090 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3091                                         void (*release)(struct dvb_frontend *fe))
3092 {
3093         if (release) {
3094                 release(fe);
3095 #ifdef CONFIG_MEDIA_ATTACH
3096                 dvb_detach(release);
3097 #endif
3098         }
3099 }
3100
3101 void dvb_frontend_detach(struct dvb_frontend *fe)
3102 {
3103         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3104         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3105         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3106         dvb_frontend_put(fe);
3107 }
3108 EXPORT_SYMBOL(dvb_frontend_detach);