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/list.h>
  27 #include <linux/freezer.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kthread.h>
  30 #include <linux/ktime.h>
  31 #include <linux/compat.h>
  32 #include <asm/processor.h>
  33
  34 #include <media/dvb_frontend.h>
  35 #include <media/dvbdev.h>
  36 #include <linux/dvb/version.h>
  37
  38 static int dvb_frontend_debug;
  39 static int dvb_shutdown_timeout;
  40 static int dvb_force_auto_inversion;
  41 static int dvb_override_tune_delay;
  42 static int dvb_powerdown_on_sleep = 1;
  43 static int dvb_mfe_wait_time = 5;
  44
  45 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  46 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  47 module_param(dvb_shutdown_timeout, int, 0644);
  48 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  49 module_param(dvb_force_auto_inversion, int, 0644);
  50 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  51 module_param(dvb_override_tune_delay, int, 0644);
  52 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  53 module_param(dvb_powerdown_on_sleep, int, 0644);
  54 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  55 module_param(dvb_mfe_wait_time, int, 0644);
  56 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)");
  57
  58 #define dprintk(fmt, arg...) \
  59         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  60
  61 #define FESTATE_IDLE 1
  62 #define FESTATE_RETUNE 2
  63 #define FESTATE_TUNING_FAST 4
  64 #define FESTATE_TUNING_SLOW 8
  65 #define FESTATE_TUNED 16
  66 #define FESTATE_ZIGZAG_FAST 32
  67 #define FESTATE_ZIGZAG_SLOW 64
  68 #define FESTATE_DISEQC 128
  69 #define FESTATE_ERROR 256
  70 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  71 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  72 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  73 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  74
  75 /*
  76  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  77  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  78  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  79  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  80  * FESTATE_TUNED. The frontend has successfully locked on.
  81  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  82  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  83  * FESTATE_DISEQC. A DISEQC command has just been issued.
  84  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  85  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  86  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  87  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  88  */
  89
  90 static DEFINE_MUTEX(frontend_mutex);
  91
  92 struct dvb_frontend_private {
  93         /* thread/frontend values */
  94         struct dvb_device *dvbdev;
  95         struct dvb_frontend_parameters parameters_out;
  96         struct dvb_fe_events events;
  97         struct semaphore sem;
  98         struct list_head list_head;
  99         wait_queue_head_t wait_queue;
 100         struct task_struct *thread;
 101         unsigned long release_jiffies;
 102         unsigned int wakeup;
 103         enum fe_status status;
 104         unsigned long tune_mode_flags;
 105         unsigned int delay;
 106         unsigned int reinitialise;
 107         int tone;
 108         int voltage;
 109
 110         /* swzigzag values */
 111         unsigned int state;
 112         unsigned int bending;
 113         int lnb_drift;
 114         unsigned int inversion;
 115         unsigned int auto_step;
 116         unsigned int auto_sub_step;
 117         unsigned int started_auto_step;
 118         unsigned int min_delay;
 119         unsigned int max_drift;
 120         unsigned int step_size;
 121         int quality;
 122         unsigned int check_wrapped;
 123         enum dvbfe_search algo_status;
 124
 125 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 126         struct media_pipeline pipe;
 127 #endif
 128 };
 129
 130 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 131                                         void (*release)(struct dvb_frontend *fe));
 132
 133 static void __dvb_frontend_free(struct dvb_frontend *fe)
 134 {
 135         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 136
 137         if (fepriv)
 138                 dvb_free_device(fepriv->dvbdev);
 139
 140         dvb_frontend_invoke_release(fe, fe->ops.release);
 141
 142         kfree(fepriv);
 143 }
 144
 145 static void dvb_frontend_free(struct kref *ref)
 146 {
 147         struct dvb_frontend *fe =
 148                 container_of(ref, struct dvb_frontend, refcount);
 149
 150         __dvb_frontend_free(fe);
 151 }
 152
 153 static void dvb_frontend_put(struct dvb_frontend *fe)
 154 {
 155         /* call detach before dropping the reference count */
 156         if (fe->ops.detach)
 157                 fe->ops.detach(fe);
 158         /*
 159          * Check if the frontend was registered, as otherwise
 160          * kref was not initialized yet.
 161          */
 162         if (fe->frontend_priv)
 163                 kref_put(&fe->refcount, dvb_frontend_free);
 164         else
 165                 __dvb_frontend_free(fe);
 166 }
 167
 168 static void dvb_frontend_get(struct dvb_frontend *fe)
 169 {
 170         kref_get(&fe->refcount);
 171 }
 172
 173 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 174 static int dtv_get_frontend(struct dvb_frontend *fe,
 175                             struct dtv_frontend_properties *c,
 176                             struct dvb_frontend_parameters *p_out);
 177 static int
 178 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 179                                 const struct dtv_frontend_properties *c,
 180                                 struct dvb_frontend_parameters *p);
 181
 182 static bool has_get_frontend(struct dvb_frontend *fe)
 183 {
 184         return fe->ops.get_frontend;
 185 }
 186
 187 /*
 188  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 189  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 190  * otherwise, a DVBv3 call will fail.
 191  */
 192 enum dvbv3_emulation_type {
 193         DVBV3_UNKNOWN,
 194         DVBV3_QPSK,
 195         DVBV3_QAM,
 196         DVBV3_OFDM,
 197         DVBV3_ATSC,
 198 };
 199
 200 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 201 {
 202         switch (delivery_system) {
 203         case SYS_DVBC_ANNEX_A:
 204         case SYS_DVBC_ANNEX_C:
 205                 return DVBV3_QAM;
 206         case SYS_DVBS:
 207         case SYS_DVBS2:
 208         case SYS_TURBO:
 209         case SYS_ISDBS:
 210         case SYS_DSS:
 211                 return DVBV3_QPSK;
 212         case SYS_DVBT:
 213         case SYS_DVBT2:
 214         case SYS_ISDBT:
 215         case SYS_DTMB:
 216                 return DVBV3_OFDM;
 217         case SYS_ATSC:
 218         case SYS_ATSCMH:
 219         case SYS_DVBC_ANNEX_B:
 220                 return DVBV3_ATSC;
 221         case SYS_UNDEFINED:
 222         case SYS_ISDBC:
 223         case SYS_DVBH:
 224         case SYS_DAB:
 225         default:
 226                 /*
 227                  * Doesn't know how to emulate those types and/or
 228                  * there's no frontend driver from this type yet
 229                  * with some emulation code, so, we're not sure yet how
 230                  * to handle them, or they're not compatible with a DVBv3 call.
 231                  */
 232                 return DVBV3_UNKNOWN;
 233         }
 234 }
 235
 236 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 237                                    enum fe_status status)
 238 {
 239         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 240         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 241         struct dvb_fe_events *events = &fepriv->events;
 242         struct dvb_frontend_event *e;
 243         int wp;
 244
 245         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 246
 247         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 248                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 249
 250         mutex_lock(&events->mtx);
 251
 252         wp = (events->eventw + 1) % MAX_EVENT;
 253         if (wp == events->eventr) {
 254                 events->overflow = 1;
 255                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 256         }
 257
 258         e = &events->events[events->eventw];
 259         e->status = status;
 260         e->parameters = fepriv->parameters_out;
 261
 262         events->eventw = wp;
 263
 264         mutex_unlock(&events->mtx);
 265
 266         wake_up_interruptible(&events->wait_queue);
 267 }
 268
 269 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 270                                    struct dvb_fe_events *events)
 271 {
 272         int ret;
 273
 274         up(&fepriv->sem);
 275         ret = events->eventw != events->eventr;
 276         down(&fepriv->sem);
 277
 278         return ret;
 279 }
 280
 281 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 282                                   struct dvb_frontend_event *event, int flags)
 283 {
 284         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 285         struct dvb_fe_events *events = &fepriv->events;
 286
 287         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 288
 289         if (events->overflow) {
 290                 events->overflow = 0;
 291                 return -EOVERFLOW;
 292         }
 293
 294         if (events->eventw == events->eventr) {
 295                 int ret;
 296
 297                 if (flags & O_NONBLOCK)
 298                         return -EWOULDBLOCK;
 299
 300                 ret = wait_event_interruptible(events->wait_queue,
 301                                                dvb_frontend_test_event(fepriv, events));
 302
 303                 if (ret < 0)
 304                         return ret;
 305         }
 306
 307         mutex_lock(&events->mtx);
 308         *event = events->events[events->eventr];
 309         events->eventr = (events->eventr + 1) % MAX_EVENT;
 310         mutex_unlock(&events->mtx);
 311
 312         return 0;
 313 }
 314
 315 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 316 {
 317         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 318         struct dvb_fe_events *events = &fepriv->events;
 319
 320         mutex_lock(&events->mtx);
 321         events->eventr = events->eventw;
 322         mutex_unlock(&events->mtx);
 323 }
 324
 325 static void dvb_frontend_init(struct dvb_frontend *fe)
 326 {
 327         dev_dbg(fe->dvb->device,
 328                 "%s: initialising adapter %i frontend %i (%s)...\n",
 329                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 330
 331         if (fe->ops.init)
 332                 fe->ops.init(fe);
 333         if (fe->ops.tuner_ops.init) {
 334                 if (fe->ops.i2c_gate_ctrl)
 335                         fe->ops.i2c_gate_ctrl(fe, 1);
 336                 fe->ops.tuner_ops.init(fe);
 337                 if (fe->ops.i2c_gate_ctrl)
 338                         fe->ops.i2c_gate_ctrl(fe, 0);
 339         }
 340 }
 341
 342 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 343 {
 344         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 345
 346         fepriv->reinitialise = 1;
 347         dvb_frontend_wakeup(fe);
 348 }
 349 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 350
 351 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 352 {
 353         int q2;
 354         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 355
 356         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 357
 358         if (locked)
 359                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 360         else
 361                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 362
 363         q2 = fepriv->quality - 128;
 364         q2 *= q2;
 365
 366         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 367 }
 368
 369 /**
 370  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 371  *      parameters.
 372  *
 373  * @fe: The frontend concerned.
 374  * @check_wrapped: Checks if an iteration has completed.
 375  *                 DO NOT SET ON THE FIRST ATTEMPT.
 376  *
 377  * return: Number of complete iterations that have been performed.
 378  */
 379 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 380 {
 381         int autoinversion;
 382         int ready = 0;
 383         int fe_set_err = 0;
 384         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 385         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 386         int original_inversion = c->inversion;
 387         u32 original_frequency = c->frequency;
 388
 389         /* are we using autoinversion? */
 390         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 391                          (c->inversion == INVERSION_AUTO));
 392
 393         /* setup parameters correctly */
 394         while (!ready) {
 395                 /* calculate the lnb_drift */
 396                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 397
 398                 /* wrap the auto_step if we've exceeded the maximum drift */
 399                 if (fepriv->lnb_drift > fepriv->max_drift) {
 400                         fepriv->auto_step = 0;
 401                         fepriv->auto_sub_step = 0;
 402                         fepriv->lnb_drift = 0;
 403                 }
 404
 405                 /* perform inversion and +/- zigzag */
 406                 switch (fepriv->auto_sub_step) {
 407                 case 0:
 408                         /* try with the current inversion and current drift setting */
 409                         ready = 1;
 410                         break;
 411
 412                 case 1:
 413                         if (!autoinversion) break;
 414
 415                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 416                         ready = 1;
 417                         break;
 418
 419                 case 2:
 420                         if (fepriv->lnb_drift == 0) break;
 421
 422                         fepriv->lnb_drift = -fepriv->lnb_drift;
 423                         ready = 1;
 424                         break;
 425
 426                 case 3:
 427                         if (fepriv->lnb_drift == 0) break;
 428                         if (!autoinversion) break;
 429
 430                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 431                         fepriv->lnb_drift = -fepriv->lnb_drift;
 432                         ready = 1;
 433                         break;
 434
 435                 default:
 436                         fepriv->auto_step++;
 437                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 438                         break;
 439                 }
 440
 441                 if (!ready) fepriv->auto_sub_step++;
 442         }
 443
 444         /* if this attempt would hit where we started, indicate a complete
 445          * iteration has occurred */
 446         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 447             (fepriv->auto_sub_step == 0) && check_wrapped) {
 448                 return 1;
 449         }
 450
 451         dev_dbg(fe->dvb->device,
 452                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 453                 __func__, fepriv->lnb_drift, fepriv->inversion,
 454                 fepriv->auto_step, fepriv->auto_sub_step,
 455                 fepriv->started_auto_step);
 456
 457         /* set the frontend itself */
 458         c->frequency += fepriv->lnb_drift;
 459         if (autoinversion)
 460                 c->inversion = fepriv->inversion;
 461         tmp = *c;
 462         if (fe->ops.set_frontend)
 463                 fe_set_err = fe->ops.set_frontend(fe);
 464         *c = tmp;
 465         if (fe_set_err < 0) {
 466                 fepriv->state = FESTATE_ERROR;
 467                 return fe_set_err;
 468         }
 469
 470         c->frequency = original_frequency;
 471         c->inversion = original_inversion;
 472
 473         fepriv->auto_sub_step++;
 474         return 0;
 475 }
 476
 477 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 478 {
 479         enum fe_status s = FE_NONE;
 480         int retval = 0;
 481         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 482         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 483
 484         if (fepriv->max_drift)
 485                 dev_warn_once(fe->dvb->device,
 486                               "Frontend requested software zigzag, but didn't set the frequency step size\n");
 487
 488         /* if we've got no parameters, just keep idling */
 489         if (fepriv->state & FESTATE_IDLE) {
 490                 fepriv->delay = 3 * HZ;
 491                 fepriv->quality = 0;
 492                 return;
 493         }
 494
 495         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 496         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 497                 if (fepriv->state & FESTATE_RETUNE) {
 498                         tmp = *c;
 499                         if (fe->ops.set_frontend)
 500                                 retval = fe->ops.set_frontend(fe);
 501                         *c = tmp;
 502                         if (retval < 0)
 503                                 fepriv->state = FESTATE_ERROR;
 504                         else
 505                                 fepriv->state = FESTATE_TUNED;
 506                 }
 507                 fepriv->delay = 3 * HZ;
 508                 fepriv->quality = 0;
 509                 return;
 510         }
 511
 512         /* get the frontend status */
 513         if (fepriv->state & FESTATE_RETUNE) {
 514                 s = 0;
 515         } else {
 516                 if (fe->ops.read_status)
 517                         fe->ops.read_status(fe, &s);
 518                 if (s != fepriv->status) {
 519                         dvb_frontend_add_event(fe, s);
 520                         fepriv->status = s;
 521                 }
 522         }
 523
 524         /* if we're not tuned, and we have a lock, move to the TUNED state */
 525         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 526                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 527                 fepriv->state = FESTATE_TUNED;
 528
 529                 /* if we're tuned, then we have determined the correct inversion */
 530                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 531                     (c->inversion == INVERSION_AUTO)) {
 532                         c->inversion = fepriv->inversion;
 533                 }
 534                 return;
 535         }
 536
 537         /* if we are tuned already, check we're still locked */
 538         if (fepriv->state & FESTATE_TUNED) {
 539                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 540
 541                 /* we're tuned, and the lock is still good... */
 542                 if (s & FE_HAS_LOCK) {
 543                         return;
 544                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 545                         fepriv->state = FESTATE_ZIGZAG_FAST;
 546                         fepriv->started_auto_step = fepriv->auto_step;
 547                         fepriv->check_wrapped = 0;
 548                 }
 549         }
 550
 551         /* don't actually do anything if we're in the LOSTLOCK state,
 552          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 553         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 554             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 555                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 556                 return;
 557         }
 558
 559         /* don't do anything if we're in the DISEQC state, since this
 560          * might be someone with a motorized dish controlled by DISEQC.
 561          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 562         if (fepriv->state & FESTATE_DISEQC) {
 563                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 564                 return;
 565         }
 566
 567         /* if we're in the RETUNE state, set everything up for a brand
 568          * new scan, keeping the current inversion setting, as the next
 569          * tune is _very_ likely to require the same */
 570         if (fepriv->state & FESTATE_RETUNE) {
 571                 fepriv->lnb_drift = 0;
 572                 fepriv->auto_step = 0;
 573                 fepriv->auto_sub_step = 0;
 574                 fepriv->started_auto_step = 0;
 575                 fepriv->check_wrapped = 0;
 576         }
 577
 578         /* fast zigzag. */
 579         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 580                 fepriv->delay = fepriv->min_delay;
 581
 582                 /* perform a tune */
 583                 retval = dvb_frontend_swzigzag_autotune(fe,
 584                                                         fepriv->check_wrapped);
 585                 if (retval < 0) {
 586                         return;
 587                 } else if (retval) {
 588                         /* OK, if we've run out of trials at the fast speed.
 589                          * Drop back to slow for the _next_ attempt */
 590                         fepriv->state = FESTATE_SEARCHING_SLOW;
 591                         fepriv->started_auto_step = fepriv->auto_step;
 592                         return;
 593                 }
 594                 fepriv->check_wrapped = 1;
 595
 596                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 597                  * This ensures we cannot return from an
 598                  * FE_SET_FRONTEND ioctl before the first frontend tune
 599                  * occurs */
 600                 if (fepriv->state & FESTATE_RETUNE) {
 601                         fepriv->state = FESTATE_TUNING_FAST;
 602                 }
 603         }
 604
 605         /* slow zigzag */
 606         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 607                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 608
 609                 /* Note: don't bother checking for wrapping; we stay in this
 610                  * state until we get a lock */
 611                 dvb_frontend_swzigzag_autotune(fe, 0);
 612         }
 613 }
 614
 615 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 616 {
 617         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 618
 619         if (fe->exit != DVB_FE_NO_EXIT)
 620                 return 1;
 621
 622         if (fepriv->dvbdev->writers == 1)
 623                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 624                                   dvb_shutdown_timeout * HZ))
 625                         return 1;
 626
 627         return 0;
 628 }
 629
 630 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 631 {
 632         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 633
 634         if (fepriv->wakeup) {
 635                 fepriv->wakeup = 0;
 636                 return 1;
 637         }
 638         return dvb_frontend_is_exiting(fe);
 639 }
 640
 641 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 642 {
 643         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 644
 645         fepriv->wakeup = 1;
 646         wake_up_interruptible(&fepriv->wait_queue);
 647 }
 648
 649 static int dvb_frontend_thread(void *data)
 650 {
 651         struct dvb_frontend *fe = data;
 652         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 653         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 654         enum fe_status s = FE_NONE;
 655         enum dvbfe_algo algo;
 656         bool re_tune = false;
 657         bool semheld = false;
 658
 659         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 660
 661         fepriv->check_wrapped = 0;
 662         fepriv->quality = 0;
 663         fepriv->delay = 3 * HZ;
 664         fepriv->status = 0;
 665         fepriv->wakeup = 0;
 666         fepriv->reinitialise = 0;
 667
 668         dvb_frontend_init(fe);
 669
 670         set_freezable();
 671         while (1) {
 672                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 673 restart:
 674                 wait_event_interruptible_timeout(fepriv->wait_queue,
 675                                                  dvb_frontend_should_wakeup(fe) ||
 676                                                  kthread_should_stop() ||
 677                                                  freezing(current),
 678                         fepriv->delay);
 679
 680                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 681                         /* got signal or quitting */
 682                         if (!down_interruptible(&fepriv->sem))
 683                                 semheld = true;
 684                         fe->exit = DVB_FE_NORMAL_EXIT;
 685                         break;
 686                 }
 687
 688                 if (try_to_freeze())
 689                         goto restart;
 690
 691                 if (down_interruptible(&fepriv->sem))
 692                         break;
 693
 694                 if (fepriv->reinitialise) {
 695                         dvb_frontend_init(fe);
 696                         if (fe->ops.set_tone && fepriv->tone != -1)
 697                                 fe->ops.set_tone(fe, fepriv->tone);
 698                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 699                                 fe->ops.set_voltage(fe, fepriv->voltage);
 700                         fepriv->reinitialise = 0;
 701                 }
 702
 703                 /* do an iteration of the tuning loop */
 704                 if (fe->ops.get_frontend_algo) {
 705                         algo = fe->ops.get_frontend_algo(fe);
 706                         switch (algo) {
 707                         case DVBFE_ALGO_HW:
 708                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 709
 710                                 if (fepriv->state & FESTATE_RETUNE) {
 711                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 712                                         re_tune = true;
 713                                         fepriv->state = FESTATE_TUNED;
 714                                 } else {
 715                                         re_tune = false;
 716                                 }
 717
 718                                 if (fe->ops.tune)
 719                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 720
 721                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 722                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 723                                         dvb_frontend_add_event(fe, s);
 724                                         fepriv->status = s;
 725                                 }
 726                                 break;
 727                         case DVBFE_ALGO_SW:
 728                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 729                                 dvb_frontend_swzigzag(fe);
 730                                 break;
 731                         case DVBFE_ALGO_CUSTOM:
 732                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 733                                 if (fepriv->state & FESTATE_RETUNE) {
 734                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 735                                         fepriv->state = FESTATE_TUNED;
 736                                 }
 737                                 /* Case where we are going to search for a carrier
 738                                  * User asked us to retune again for some reason, possibly
 739                                  * requesting a search with a new set of parameters
 740                                  */
 741                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 742                                         if (fe->ops.search) {
 743                                                 fepriv->algo_status = fe->ops.search(fe);
 744                                                 /* We did do a search as was requested, the flags are
 745                                                  * now unset as well and has the flags wrt to search.
 746                                                  */
 747                                         } else {
 748                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 749                                         }
 750                                 }
 751                                 /* Track the carrier if the search was successful */
 752                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 753                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 754                                         fepriv->delay = HZ / 2;
 755                                 }
 756                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 757                                 fe->ops.read_status(fe, &s);
 758                                 if (s != fepriv->status) {
 759                                         dvb_frontend_add_event(fe, s); /* update event list */
 760                                         fepriv->status = s;
 761                                         if (!(s & FE_HAS_LOCK)) {
 762                                                 fepriv->delay = HZ / 10;
 763                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 764                                         } else {
 765                                                 fepriv->delay = 60 * HZ;
 766                                         }
 767                                 }
 768                                 break;
 769                         default:
 770                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 771                                 break;
 772                         }
 773                 } else {
 774                         dvb_frontend_swzigzag(fe);
 775                 }
 776         }
 777
 778         if (dvb_powerdown_on_sleep) {
 779                 if (fe->ops.set_voltage)
 780                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 781                 if (fe->ops.tuner_ops.sleep) {
 782                         if (fe->ops.i2c_gate_ctrl)
 783                                 fe->ops.i2c_gate_ctrl(fe, 1);
 784                         fe->ops.tuner_ops.sleep(fe);
 785                         if (fe->ops.i2c_gate_ctrl)
 786                                 fe->ops.i2c_gate_ctrl(fe, 0);
 787                 }
 788                 if (fe->ops.sleep)
 789                         fe->ops.sleep(fe);
 790         }
 791
 792         fepriv->thread = NULL;
 793         if (kthread_should_stop())
 794                 fe->exit = DVB_FE_DEVICE_REMOVED;
 795         else
 796                 fe->exit = DVB_FE_NO_EXIT;
 797         mb();
 798
 799         if (semheld)
 800                 up(&fepriv->sem);
 801         dvb_frontend_wakeup(fe);
 802         return 0;
 803 }
 804
 805 static void dvb_frontend_stop(struct dvb_frontend *fe)
 806 {
 807         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 808
 809         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 810
 811         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 812                 fe->exit = DVB_FE_NORMAL_EXIT;
 813         mb();
 814
 815         if (!fepriv->thread)
 816                 return;
 817
 818         kthread_stop(fepriv->thread);
 819
 820         sema_init(&fepriv->sem, 1);
 821         fepriv->state = FESTATE_IDLE;
 822
 823         /* paranoia check in case a signal arrived */
 824         if (fepriv->thread)
 825                 dev_warn(fe->dvb->device,
 826                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 827                          fepriv->thread);
 828 }
 829
 830 /*
 831  * Sleep for the amount of time given by add_usec parameter
 832  *
 833  * This needs to be as precise as possible, as it affects the detection of
 834  * the dish tone command at the satellite subsystem. The precision is improved
 835  * by using a scheduled msleep followed by udelay for the remainder.
 836  */
 837 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 838 {
 839         s32 delta;
 840
 841         *waketime = ktime_add_us(*waketime, add_usec);
 842         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 843         if (delta > 2500) {
 844                 msleep((delta - 1500) / 1000);
 845                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 846         }
 847         if (delta > 0)
 848                 udelay(delta);
 849 }
 850 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 851
 852 static int dvb_frontend_start(struct dvb_frontend *fe)
 853 {
 854         int ret;
 855         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 856         struct task_struct *fe_thread;
 857
 858         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 859
 860         if (fepriv->thread) {
 861                 if (fe->exit == DVB_FE_NO_EXIT)
 862                         return 0;
 863                 else
 864                         dvb_frontend_stop(fe);
 865         }
 866
 867         if (signal_pending(current))
 868                 return -EINTR;
 869         if (down_interruptible(&fepriv->sem))
 870                 return -EINTR;
 871
 872         fepriv->state = FESTATE_IDLE;
 873         fe->exit = DVB_FE_NO_EXIT;
 874         fepriv->thread = NULL;
 875         mb();
 876
 877         fe_thread = kthread_run(dvb_frontend_thread, fe,
 878                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 879         if (IS_ERR(fe_thread)) {
 880                 ret = PTR_ERR(fe_thread);
 881                 dev_warn(fe->dvb->device,
 882                          "dvb_frontend_start: failed to start kthread (%d)\n",
 883                          ret);
 884                 up(&fepriv->sem);
 885                 return ret;
 886         }
 887         fepriv->thread = fe_thread;
 888         return 0;
 889 }
 890
 891 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 892                                               u32 *freq_min, u32 *freq_max,
 893                                               u32 *tolerance)
 894 {
 895         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 896         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 897         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 898         u32 frontend_min = fe->ops.info.frequency_min_hz;
 899         u32 frontend_max = fe->ops.info.frequency_max_hz;
 900
 901         *freq_min = max(frontend_min, tuner_min);
 902
 903         if (frontend_max == 0)
 904                 *freq_max = tuner_max;
 905         else if (tuner_max == 0)
 906                 *freq_max = frontend_max;
 907         else
 908                 *freq_max = min(frontend_max, tuner_max);
 909
 910         if (*freq_min == 0 || *freq_max == 0)
 911                 dev_warn(fe->dvb->device,
 912                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 913                          fe->dvb->num, fe->id);
 914
 915         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 916                 tuner_min, tuner_max, frontend_min, frontend_max);
 917
 918         /* If the standard is for satellite, convert frequencies to kHz */
 919         switch (c->delivery_system) {
 920         case SYS_DVBS:
 921         case SYS_DVBS2:
 922         case SYS_TURBO:
 923         case SYS_ISDBS:
 924                 *freq_min /= kHz;
 925                 *freq_max /= kHz;
 926                 if (tolerance)
 927                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 928
 929                 break;
 930         default:
 931                 if (tolerance)
 932                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 933                 break;
 934         }
 935 }
 936
 937 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 938 {
 939         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 940         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 941         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 942         u32 step = max(fe_step, tuner_step);
 943
 944         switch (c->delivery_system) {
 945         case SYS_DVBS:
 946         case SYS_DVBS2:
 947         case SYS_TURBO:
 948         case SYS_ISDBS:
 949                 step /= kHz;
 950                 break;
 951         default:
 952                 break;
 953         }
 954
 955         return step;
 956 }
 957
 958 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 959 {
 960         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 961         u32 freq_min;
 962         u32 freq_max;
 963
 964         /* range check: frequency */
 965         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 966         if ((freq_min && c->frequency < freq_min) ||
 967             (freq_max && c->frequency > freq_max)) {
 968                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 969                          fe->dvb->num, fe->id, c->frequency,
 970                          freq_min, freq_max);
 971                 return -EINVAL;
 972         }
 973
 974         /* range check: symbol rate */
 975         switch (c->delivery_system) {
 976         case SYS_DVBS:
 977         case SYS_DVBS2:
 978         case SYS_TURBO:
 979         case SYS_DVBC_ANNEX_A:
 980         case SYS_DVBC_ANNEX_C:
 981                 if ((fe->ops.info.symbol_rate_min &&
 982                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 983                     (fe->ops.info.symbol_rate_max &&
 984                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 985                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 986                                  fe->dvb->num, fe->id, c->symbol_rate,
 987                                  fe->ops.info.symbol_rate_min,
 988                                  fe->ops.info.symbol_rate_max);
 989                         return -EINVAL;
 990                 }
 991                 break;
 992         default:
 993                 break;
 994         }
 995
 996         return 0;
 997 }
 998
 999 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1000 {
1001         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1002         int i;
1003         u32 delsys;
1004
1005         delsys = c->delivery_system;
1006         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1007         c->delivery_system = delsys;
1008
1009         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1010                 __func__, c->delivery_system);
1011
1012         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1013         c->bandwidth_hz = 0;    /* AUTO */
1014         c->guard_interval = GUARD_INTERVAL_AUTO;
1015         c->hierarchy = HIERARCHY_AUTO;
1016         c->symbol_rate = 0;
1017         c->code_rate_HP = FEC_AUTO;
1018         c->code_rate_LP = FEC_AUTO;
1019         c->fec_inner = FEC_AUTO;
1020         c->rolloff = ROLLOFF_AUTO;
1021         c->voltage = SEC_VOLTAGE_OFF;
1022         c->sectone = SEC_TONE_OFF;
1023         c->pilot = PILOT_AUTO;
1024
1025         c->isdbt_partial_reception = 0;
1026         c->isdbt_sb_mode = 0;
1027         c->isdbt_sb_subchannel = 0;
1028         c->isdbt_sb_segment_idx = 0;
1029         c->isdbt_sb_segment_count = 0;
1030         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1031         for (i = 0; i < 3; i++) {
1032                 c->layer[i].fec = FEC_AUTO;
1033                 c->layer[i].modulation = QAM_AUTO;
1034                 c->layer[i].interleaving = 0;
1035                 c->layer[i].segment_count = 0;
1036         }
1037
1038         c->stream_id = NO_STREAM_ID_FILTER;
1039         c->scrambling_sequence_index = 0;/* default sequence */
1040
1041         switch (c->delivery_system) {
1042         case SYS_DVBS:
1043         case SYS_DVBS2:
1044         case SYS_TURBO:
1045                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1046                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1047                 break;
1048         case SYS_ATSC:
1049                 c->modulation = VSB_8;
1050                 break;
1051         case SYS_ISDBS:
1052                 c->symbol_rate = 28860000;
1053                 c->rolloff = ROLLOFF_35;
1054                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1055                 break;
1056         default:
1057                 c->modulation = QAM_AUTO;
1058                 break;
1059         }
1060
1061         c->lna = LNA_AUTO;
1062
1063         return 0;
1064 }
1065
1066 #define _DTV_CMD(n, s, b) \
1067 [n] = { \
1068         .name = #n, \
1069         .cmd  = n, \
1070         .set  = s,\
1071         .buffer = b \
1072 }
1073
1074 struct dtv_cmds_h {
1075         char    *name;          /* A display name for debugging purposes */
1076
1077         __u32   cmd;            /* A unique ID */
1078
1079         /* Flags */
1080         __u32   set:1;          /* Either a set or get property */
1081         __u32   buffer:1;       /* Does this property use the buffer? */
1082         __u32   reserved:30;    /* Align */
1083 };
1084
1085 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1086         _DTV_CMD(DTV_TUNE, 1, 0),
1087         _DTV_CMD(DTV_CLEAR, 1, 0),
1088
1089         /* Set */
1090         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1091         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1092         _DTV_CMD(DTV_MODULATION, 1, 0),
1093         _DTV_CMD(DTV_INVERSION, 1, 0),
1094         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1095         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1096         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1097         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1098         _DTV_CMD(DTV_TONE, 1, 0),
1099         _DTV_CMD(DTV_PILOT, 1, 0),
1100         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1101         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1102         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1103         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1104         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1105         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1106         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1107         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1108
1109         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1110         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1111         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1112         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1113         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1114         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1115         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1116         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1117         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1118         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1119         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1120         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1121         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1122         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1123         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1124         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1125         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1126         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1127
1128         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1129         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1130         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1131         _DTV_CMD(DTV_LNA, 1, 0),
1132
1133         /* Get */
1134         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1135         _DTV_CMD(DTV_API_VERSION, 0, 0),
1136
1137         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1138
1139         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1140         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1141
1142         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1143         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1144         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1145         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1146         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1147         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1148         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1149         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1150         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1151         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1152         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1153         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1154         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1155
1156         /* Statistics API */
1157         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1158         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1159         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1160         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1161         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1162         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1163         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1164         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1165 };
1166
1167 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1168  * drivers can use a single set_frontend tuning function, regardless of whether
1169  * it's being used for the legacy or new API, reducing code and complexity.
1170  */
1171 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1172                                    struct dtv_frontend_properties *c,
1173                                    const struct dvb_frontend_parameters *p)
1174 {
1175         c->frequency = p->frequency;
1176         c->inversion = p->inversion;
1177
1178         switch (dvbv3_type(c->delivery_system)) {
1179         case DVBV3_QPSK:
1180                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1181                 c->symbol_rate = p->u.qpsk.symbol_rate;
1182                 c->fec_inner = p->u.qpsk.fec_inner;
1183                 break;
1184         case DVBV3_QAM:
1185                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1186                 c->symbol_rate = p->u.qam.symbol_rate;
1187                 c->fec_inner = p->u.qam.fec_inner;
1188                 c->modulation = p->u.qam.modulation;
1189                 break;
1190         case DVBV3_OFDM:
1191                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1192
1193                 switch (p->u.ofdm.bandwidth) {
1194                 case BANDWIDTH_10_MHZ:
1195                         c->bandwidth_hz = 10000000;
1196                         break;
1197                 case BANDWIDTH_8_MHZ:
1198                         c->bandwidth_hz = 8000000;
1199                         break;
1200                 case BANDWIDTH_7_MHZ:
1201                         c->bandwidth_hz = 7000000;
1202                         break;
1203                 case BANDWIDTH_6_MHZ:
1204                         c->bandwidth_hz = 6000000;
1205                         break;
1206                 case BANDWIDTH_5_MHZ:
1207                         c->bandwidth_hz = 5000000;
1208                         break;
1209                 case BANDWIDTH_1_712_MHZ:
1210                         c->bandwidth_hz = 1712000;
1211                         break;
1212                 case BANDWIDTH_AUTO:
1213                         c->bandwidth_hz = 0;
1214                 }
1215
1216                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1217                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1218                 c->modulation = p->u.ofdm.constellation;
1219                 c->transmission_mode = p->u.ofdm.transmission_mode;
1220                 c->guard_interval = p->u.ofdm.guard_interval;
1221                 c->hierarchy = p->u.ofdm.hierarchy_information;
1222                 break;
1223         case DVBV3_ATSC:
1224                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1225                 c->modulation = p->u.vsb.modulation;
1226                 if (c->delivery_system == SYS_ATSCMH)
1227                         break;
1228                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1229                         c->delivery_system = SYS_ATSC;
1230                 else
1231                         c->delivery_system = SYS_DVBC_ANNEX_B;
1232                 break;
1233         case DVBV3_UNKNOWN:
1234                 dev_err(fe->dvb->device,
1235                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1236                         __func__, c->delivery_system);
1237                 return -EINVAL;
1238         }
1239
1240         return 0;
1241 }
1242
1243 /* Ensure the cached values are set correctly in the frontend
1244  * legacy tuning structures, for the advanced tuning API.
1245  */
1246 static int
1247 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1248                                 const struct dtv_frontend_properties *c,
1249                                 struct dvb_frontend_parameters *p)
1250 {
1251         p->frequency = c->frequency;
1252         p->inversion = c->inversion;
1253
1254         switch (dvbv3_type(c->delivery_system)) {
1255         case DVBV3_UNKNOWN:
1256                 dev_err(fe->dvb->device,
1257                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1258                         __func__, c->delivery_system);
1259                 return -EINVAL;
1260         case DVBV3_QPSK:
1261                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1262                 p->u.qpsk.symbol_rate = c->symbol_rate;
1263                 p->u.qpsk.fec_inner = c->fec_inner;
1264                 break;
1265         case DVBV3_QAM:
1266                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1267                 p->u.qam.symbol_rate = c->symbol_rate;
1268                 p->u.qam.fec_inner = c->fec_inner;
1269                 p->u.qam.modulation = c->modulation;
1270                 break;
1271         case DVBV3_OFDM:
1272                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1273                 switch (c->bandwidth_hz) {
1274                 case 10000000:
1275                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1276                         break;
1277                 case 8000000:
1278                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1279                         break;
1280                 case 7000000:
1281                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1282                         break;
1283                 case 6000000:
1284                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1285                         break;
1286                 case 5000000:
1287                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1288                         break;
1289                 case 1712000:
1290                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1291                         break;
1292                 case 0:
1293                 default:
1294                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1295                 }
1296                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1297                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1298                 p->u.ofdm.constellation = c->modulation;
1299                 p->u.ofdm.transmission_mode = c->transmission_mode;
1300                 p->u.ofdm.guard_interval = c->guard_interval;
1301                 p->u.ofdm.hierarchy_information = c->hierarchy;
1302                 break;
1303         case DVBV3_ATSC:
1304                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1305                 p->u.vsb.modulation = c->modulation;
1306                 break;
1307         }
1308         return 0;
1309 }
1310
1311 /**
1312  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1313  * @fe:         struct dvb_frontend pointer
1314  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1315  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1316  *
1317  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1318  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1319  * If p_out is not null, it will update the DVBv3 params pointed by it.
1320  */
1321 static int dtv_get_frontend(struct dvb_frontend *fe,
1322                             struct dtv_frontend_properties *c,
1323                             struct dvb_frontend_parameters *p_out)
1324 {
1325         int r;
1326
1327         if (fe->ops.get_frontend) {
1328                 r = fe->ops.get_frontend(fe, c);
1329                 if (unlikely(r < 0))
1330                         return r;
1331                 if (p_out)
1332                         dtv_property_legacy_params_sync(fe, c, p_out);
1333                 return 0;
1334         }
1335
1336         /* As everything is in cache, get_frontend fops are always supported */
1337         return 0;
1338 }
1339
1340 static int dvb_frontend_handle_ioctl(struct file *file,
1341                                      unsigned int cmd, void *parg);
1342
1343 static int dtv_property_process_get(struct dvb_frontend *fe,
1344                                     const struct dtv_frontend_properties *c,
1345                                     struct dtv_property *tvp,
1346                                     struct file *file)
1347 {
1348         int ncaps;
1349
1350         switch (tvp->cmd) {
1351         case DTV_ENUM_DELSYS:
1352                 ncaps = 0;
1353                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1354                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1355                         ncaps++;
1356                 }
1357                 tvp->u.buffer.len = ncaps;
1358                 break;
1359         case DTV_FREQUENCY:
1360                 tvp->u.data = c->frequency;
1361                 break;
1362         case DTV_MODULATION:
1363                 tvp->u.data = c->modulation;
1364                 break;
1365         case DTV_BANDWIDTH_HZ:
1366                 tvp->u.data = c->bandwidth_hz;
1367                 break;
1368         case DTV_INVERSION:
1369                 tvp->u.data = c->inversion;
1370                 break;
1371         case DTV_SYMBOL_RATE:
1372                 tvp->u.data = c->symbol_rate;
1373                 break;
1374         case DTV_INNER_FEC:
1375                 tvp->u.data = c->fec_inner;
1376                 break;
1377         case DTV_PILOT:
1378                 tvp->u.data = c->pilot;
1379                 break;
1380         case DTV_ROLLOFF:
1381                 tvp->u.data = c->rolloff;
1382                 break;
1383         case DTV_DELIVERY_SYSTEM:
1384                 tvp->u.data = c->delivery_system;
1385                 break;
1386         case DTV_VOLTAGE:
1387                 tvp->u.data = c->voltage;
1388                 break;
1389         case DTV_TONE:
1390                 tvp->u.data = c->sectone;
1391                 break;
1392         case DTV_API_VERSION:
1393                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1394                 break;
1395         case DTV_CODE_RATE_HP:
1396                 tvp->u.data = c->code_rate_HP;
1397                 break;
1398         case DTV_CODE_RATE_LP:
1399                 tvp->u.data = c->code_rate_LP;
1400                 break;
1401         case DTV_GUARD_INTERVAL:
1402                 tvp->u.data = c->guard_interval;
1403                 break;
1404         case DTV_TRANSMISSION_MODE:
1405                 tvp->u.data = c->transmission_mode;
1406                 break;
1407         case DTV_HIERARCHY:
1408                 tvp->u.data = c->hierarchy;
1409                 break;
1410         case DTV_INTERLEAVING:
1411                 tvp->u.data = c->interleaving;
1412                 break;
1413
1414         /* ISDB-T Support here */
1415         case DTV_ISDBT_PARTIAL_RECEPTION:
1416                 tvp->u.data = c->isdbt_partial_reception;
1417                 break;
1418         case DTV_ISDBT_SOUND_BROADCASTING:
1419                 tvp->u.data = c->isdbt_sb_mode;
1420                 break;
1421         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1422                 tvp->u.data = c->isdbt_sb_subchannel;
1423                 break;
1424         case DTV_ISDBT_SB_SEGMENT_IDX:
1425                 tvp->u.data = c->isdbt_sb_segment_idx;
1426                 break;
1427         case DTV_ISDBT_SB_SEGMENT_COUNT:
1428                 tvp->u.data = c->isdbt_sb_segment_count;
1429                 break;
1430         case DTV_ISDBT_LAYER_ENABLED:
1431                 tvp->u.data = c->isdbt_layer_enabled;
1432                 break;
1433         case DTV_ISDBT_LAYERA_FEC:
1434                 tvp->u.data = c->layer[0].fec;
1435                 break;
1436         case DTV_ISDBT_LAYERA_MODULATION:
1437                 tvp->u.data = c->layer[0].modulation;
1438                 break;
1439         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1440                 tvp->u.data = c->layer[0].segment_count;
1441                 break;
1442         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1443                 tvp->u.data = c->layer[0].interleaving;
1444                 break;
1445         case DTV_ISDBT_LAYERB_FEC:
1446                 tvp->u.data = c->layer[1].fec;
1447                 break;
1448         case DTV_ISDBT_LAYERB_MODULATION:
1449                 tvp->u.data = c->layer[1].modulation;
1450                 break;
1451         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1452                 tvp->u.data = c->layer[1].segment_count;
1453                 break;
1454         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1455                 tvp->u.data = c->layer[1].interleaving;
1456                 break;
1457         case DTV_ISDBT_LAYERC_FEC:
1458                 tvp->u.data = c->layer[2].fec;
1459                 break;
1460         case DTV_ISDBT_LAYERC_MODULATION:
1461                 tvp->u.data = c->layer[2].modulation;
1462                 break;
1463         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1464                 tvp->u.data = c->layer[2].segment_count;
1465                 break;
1466         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1467                 tvp->u.data = c->layer[2].interleaving;
1468                 break;
1469
1470         /* Multistream support */
1471         case DTV_STREAM_ID:
1472         case DTV_DVBT2_PLP_ID_LEGACY:
1473                 tvp->u.data = c->stream_id;
1474                 break;
1475
1476         /* Physical layer scrambling support */
1477         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1478                 tvp->u.data = c->scrambling_sequence_index;
1479                 break;
1480
1481         /* ATSC-MH */
1482         case DTV_ATSCMH_FIC_VER:
1483                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1484                 break;
1485         case DTV_ATSCMH_PARADE_ID:
1486                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1487                 break;
1488         case DTV_ATSCMH_NOG:
1489                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1490                 break;
1491         case DTV_ATSCMH_TNOG:
1492                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1493                 break;
1494         case DTV_ATSCMH_SGN:
1495                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1496                 break;
1497         case DTV_ATSCMH_PRC:
1498                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1499                 break;
1500         case DTV_ATSCMH_RS_FRAME_MODE:
1501                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1502                 break;
1503         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1504                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1505                 break;
1506         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1507                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1508                 break;
1509         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1510                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1511                 break;
1512         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1513                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1514                 break;
1515         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1516                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1517                 break;
1518         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1519                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1520                 break;
1521         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1522                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1523                 break;
1524         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1525                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1526                 break;
1527
1528         case DTV_LNA:
1529                 tvp->u.data = c->lna;
1530                 break;
1531
1532         /* Fill quality measures */
1533         case DTV_STAT_SIGNAL_STRENGTH:
1534                 tvp->u.st = c->strength;
1535                 break;
1536         case DTV_STAT_CNR:
1537                 tvp->u.st = c->cnr;
1538                 break;
1539         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1540                 tvp->u.st = c->pre_bit_error;
1541                 break;
1542         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1543                 tvp->u.st = c->pre_bit_count;
1544                 break;
1545         case DTV_STAT_POST_ERROR_BIT_COUNT:
1546                 tvp->u.st = c->post_bit_error;
1547                 break;
1548         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1549                 tvp->u.st = c->post_bit_count;
1550                 break;
1551         case DTV_STAT_ERROR_BLOCK_COUNT:
1552                 tvp->u.st = c->block_error;
1553                 break;
1554         case DTV_STAT_TOTAL_BLOCK_COUNT:
1555                 tvp->u.st = c->block_count;
1556                 break;
1557         default:
1558                 dev_dbg(fe->dvb->device,
1559                         "%s: FE property %d doesn't exist\n",
1560                         __func__, tvp->cmd);
1561                 return -EINVAL;
1562         }
1563
1564         if (!dtv_cmds[tvp->cmd].buffer)
1565                 dev_dbg(fe->dvb->device,
1566                         "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1567                         __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1568                         tvp->u.data);
1569         else
1570                 dev_dbg(fe->dvb->device,
1571                         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1572                         __func__,
1573                         tvp->cmd, dtv_cmds[tvp->cmd].name,
1574                         tvp->u.buffer.len,
1575                         tvp->u.buffer.len, tvp->u.buffer.data);
1576
1577         return 0;
1578 }
1579
1580 static int dtv_set_frontend(struct dvb_frontend *fe);
1581
1582 static bool is_dvbv3_delsys(u32 delsys)
1583 {
1584         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1585                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1586 }
1587
1588 /**
1589  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1590  * @fe:                 struct frontend;
1591  * @delsys:                     DVBv5 type that will be used for emulation
1592  *
1593  * Provides emulation for delivery systems that are compatible with the old
1594  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1595  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1596  * parameters are compatible with DVB-S spec.
1597  */
1598 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1599 {
1600         int i;
1601         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1602
1603         c->delivery_system = delsys;
1604
1605         /*
1606          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1607          */
1608         if (c->delivery_system == SYS_ISDBT) {
1609                 dev_dbg(fe->dvb->device,
1610                         "%s: Using defaults for SYS_ISDBT\n",
1611                         __func__);
1612
1613                 if (!c->bandwidth_hz)
1614                         c->bandwidth_hz = 6000000;
1615
1616                 c->isdbt_partial_reception = 0;
1617                 c->isdbt_sb_mode = 0;
1618                 c->isdbt_sb_subchannel = 0;
1619                 c->isdbt_sb_segment_idx = 0;
1620                 c->isdbt_sb_segment_count = 0;
1621                 c->isdbt_layer_enabled = 7;
1622                 for (i = 0; i < 3; i++) {
1623                         c->layer[i].fec = FEC_AUTO;
1624                         c->layer[i].modulation = QAM_AUTO;
1625                         c->layer[i].interleaving = 0;
1626                         c->layer[i].segment_count = 0;
1627                 }
1628         }
1629         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1630                 __func__, c->delivery_system);
1631
1632         return 0;
1633 }
1634
1635 /**
1636  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1637  * @fe:                 frontend struct
1638  * @desired_system:     delivery system requested by the user
1639  *
1640  * A DVBv5 call know what's the desired system it wants. So, set it.
1641  *
1642  * There are, however, a few known issues with early DVBv5 applications that
1643  * are also handled by this logic:
1644  *
1645  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1646  *    This is an API violation, but, as we don't want to break userspace,
1647  *    convert it to the first supported delivery system.
1648  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1649  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1650  *    ISDB-T provided backward compat with DVB-T.
1651  */
1652 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1653                                      u32 desired_system)
1654 {
1655         int ncaps;
1656         u32 delsys = SYS_UNDEFINED;
1657         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1658         enum dvbv3_emulation_type type;
1659
1660         /*
1661          * It was reported that some old DVBv5 applications were
1662          * filling delivery_system with SYS_UNDEFINED. If this happens,
1663          * assume that the application wants to use the first supported
1664          * delivery system.
1665          */
1666         if (desired_system == SYS_UNDEFINED)
1667                 desired_system = fe->ops.delsys[0];
1668
1669         /*
1670          * This is a DVBv5 call. So, it likely knows the supported
1671          * delivery systems. So, check if the desired delivery system is
1672          * supported
1673          */
1674         ncaps = 0;
1675         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1676                 if (fe->ops.delsys[ncaps] == desired_system) {
1677                         c->delivery_system = desired_system;
1678                         dev_dbg(fe->dvb->device,
1679                                 "%s: Changing delivery system to %d\n",
1680                                 __func__, desired_system);
1681                         return 0;
1682                 }
1683                 ncaps++;
1684         }
1685
1686         /*
1687          * The requested delivery system isn't supported. Maybe userspace
1688          * is requesting a DVBv3 compatible delivery system.
1689          *
1690          * The emulation only works if the desired system is one of the
1691          * delivery systems supported by DVBv3 API
1692          */
1693         if (!is_dvbv3_delsys(desired_system)) {
1694                 dev_dbg(fe->dvb->device,
1695                         "%s: Delivery system %d not supported.\n",
1696                         __func__, desired_system);
1697                 return -EINVAL;
1698         }
1699
1700         type = dvbv3_type(desired_system);
1701
1702         /*
1703         * Get the last non-DVBv3 delivery system that has the same type
1704         * of the desired system
1705         */
1706         ncaps = 0;
1707         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1708                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1709                         delsys = fe->ops.delsys[ncaps];
1710                 ncaps++;
1711         }
1712
1713         /* There's nothing compatible with the desired delivery system */
1714         if (delsys == SYS_UNDEFINED) {
1715                 dev_dbg(fe->dvb->device,
1716                         "%s: Delivery system %d not supported on emulation mode.\n",
1717                         __func__, desired_system);
1718                 return -EINVAL;
1719         }
1720
1721         dev_dbg(fe->dvb->device,
1722                 "%s: Using delivery system %d emulated as if it were %d\n",
1723                 __func__, delsys, desired_system);
1724
1725         return emulate_delivery_system(fe, desired_system);
1726 }
1727
1728 /**
1729  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1730  * @fe: frontend struct
1731  *
1732  * A DVBv3 call doesn't know what's the desired system it wants. It also
1733  * doesn't allow to switch between different types. Due to that, userspace
1734  * should use DVBv5 instead.
1735  * However, in order to avoid breaking userspace API, limited backward
1736  * compatibility support is provided.
1737  *
1738  * There are some delivery systems that are incompatible with DVBv3 calls.
1739  *
1740  * This routine should work fine for frontends that support just one delivery
1741  * system.
1742  *
1743  * For frontends that support multiple frontends:
1744  * 1) It defaults to use the first supported delivery system. There's an
1745  *    userspace application that allows changing it at runtime;
1746  *
1747  * 2) If the current delivery system is not compatible with DVBv3, it gets
1748  *    the first one that it is compatible.
1749  *
1750  * NOTE: in order for this to work with applications like Kaffeine that
1751  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1752  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1753  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1754  *      to DVB-S.
1755  */
1756 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1757 {
1758         int ncaps;
1759         u32 delsys = SYS_UNDEFINED;
1760         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1761
1762         /* If not set yet, defaults to the first supported delivery system */
1763         if (c->delivery_system == SYS_UNDEFINED)
1764                 c->delivery_system = fe->ops.delsys[0];
1765
1766         /*
1767          * Trivial case: just use the current one, if it already a DVBv3
1768          * delivery system
1769          */
1770         if (is_dvbv3_delsys(c->delivery_system)) {
1771                 dev_dbg(fe->dvb->device,
1772                         "%s: Using delivery system to %d\n",
1773                         __func__, c->delivery_system);
1774                 return 0;
1775         }
1776
1777         /*
1778          * Seek for the first delivery system that it is compatible with a
1779          * DVBv3 standard
1780          */
1781         ncaps = 0;
1782         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1783                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1784                         delsys = fe->ops.delsys[ncaps];
1785                         break;
1786                 }
1787                 ncaps++;
1788         }
1789         if (delsys == SYS_UNDEFINED) {
1790                 dev_dbg(fe->dvb->device,
1791                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1792                         __func__);
1793                 return -EINVAL;
1794         }
1795         return emulate_delivery_system(fe, delsys);
1796 }
1797
1798 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1799 {
1800         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1801         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1802         struct dvb_frontend_tune_settings fetunesettings = { 0 };
1803
1804         /* get frontend-specific tuning settings */
1805         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1806                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1807                 fepriv->max_drift = fetunesettings.max_drift;
1808                 fepriv->step_size = fetunesettings.step_size;
1809         } else {
1810                 /* default values */
1811                 switch (c->delivery_system) {
1812                 case SYS_DVBS:
1813                 case SYS_DVBS2:
1814                 case SYS_ISDBS:
1815                 case SYS_TURBO:
1816                 case SYS_DVBC_ANNEX_A:
1817                 case SYS_DVBC_ANNEX_C:
1818                         fepriv->min_delay = HZ / 20;
1819                         fepriv->step_size = c->symbol_rate / 16000;
1820                         fepriv->max_drift = c->symbol_rate / 2000;
1821                         break;
1822                 case SYS_DVBT:
1823                 case SYS_DVBT2:
1824                 case SYS_ISDBT:
1825                 case SYS_DTMB:
1826                         fepriv->min_delay = HZ / 20;
1827                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1828                         fepriv->max_drift = fepriv->step_size + 1;
1829                         break;
1830                 default:
1831                         /*
1832                          * FIXME: This sounds wrong! if freqency_stepsize is
1833                          * defined by the frontend, why not use it???
1834                          */
1835                         fepriv->min_delay = HZ / 20;
1836                         fepriv->step_size = 0; /* no zigzag */
1837                         fepriv->max_drift = 0;
1838                         break;
1839                 }
1840         }
1841         if (dvb_override_tune_delay > 0)
1842                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1843 }
1844
1845 /**
1846  * dtv_property_process_set -  Sets a single DTV property
1847  * @fe:         Pointer to &struct dvb_frontend
1848  * @file:       Pointer to &struct file
1849  * @cmd:        Digital TV command
1850  * @data:       An unsigned 32-bits number
1851  *
1852  * This routine assigns the property
1853  * value to the corresponding member of
1854  * &struct dtv_frontend_properties
1855  *
1856  * Returns:
1857  * Zero on success, negative errno on failure.
1858  */
1859 static int dtv_property_process_set(struct dvb_frontend *fe,
1860                                     struct file *file,
1861                                     u32 cmd, u32 data)
1862 {
1863         int r = 0;
1864         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1865
1866         /** Dump DTV command name and value*/
1867         if (!cmd || cmd > DTV_MAX_COMMAND)
1868                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1869                          __func__, cmd);
1870         else
1871                 dev_dbg(fe->dvb->device,
1872                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1873                         __func__, cmd, dtv_cmds[cmd].name, data);
1874         switch (cmd) {
1875         case DTV_CLEAR:
1876                 /*
1877                  * Reset a cache of data specific to the frontend here. This does
1878                  * not effect hardware.
1879                  */
1880                 dvb_frontend_clear_cache(fe);
1881                 break;
1882         case DTV_TUNE:
1883                 /*
1884                  * Use the cached Digital TV properties to tune the
1885                  * frontend
1886                  */
1887                 dev_dbg(fe->dvb->device,
1888                         "%s: Setting the frontend from property cache\n",
1889                         __func__);
1890
1891                 r = dtv_set_frontend(fe);
1892                 break;
1893         case DTV_FREQUENCY:
1894                 c->frequency = data;
1895                 break;
1896         case DTV_MODULATION:
1897                 c->modulation = data;
1898                 break;
1899         case DTV_BANDWIDTH_HZ:
1900                 c->bandwidth_hz = data;
1901                 break;
1902         case DTV_INVERSION:
1903                 c->inversion = data;
1904                 break;
1905         case DTV_SYMBOL_RATE:
1906                 c->symbol_rate = data;
1907                 break;
1908         case DTV_INNER_FEC:
1909                 c->fec_inner = data;
1910                 break;
1911         case DTV_PILOT:
1912                 c->pilot = data;
1913                 break;
1914         case DTV_ROLLOFF:
1915                 c->rolloff = data;
1916                 break;
1917         case DTV_DELIVERY_SYSTEM:
1918                 r = dvbv5_set_delivery_system(fe, data);
1919                 break;
1920         case DTV_VOLTAGE:
1921                 c->voltage = data;
1922                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1923                                               (void *)c->voltage);
1924                 break;
1925         case DTV_TONE:
1926                 c->sectone = data;
1927                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1928                                               (void *)c->sectone);
1929                 break;
1930         case DTV_CODE_RATE_HP:
1931                 c->code_rate_HP = data;
1932                 break;
1933         case DTV_CODE_RATE_LP:
1934                 c->code_rate_LP = data;
1935                 break;
1936         case DTV_GUARD_INTERVAL:
1937                 c->guard_interval = data;
1938                 break;
1939         case DTV_TRANSMISSION_MODE:
1940                 c->transmission_mode = data;
1941                 break;
1942         case DTV_HIERARCHY:
1943                 c->hierarchy = data;
1944                 break;
1945         case DTV_INTERLEAVING:
1946                 c->interleaving = data;
1947                 break;
1948
1949         /* ISDB-T Support here */
1950         case DTV_ISDBT_PARTIAL_RECEPTION:
1951                 c->isdbt_partial_reception = data;
1952                 break;
1953         case DTV_ISDBT_SOUND_BROADCASTING:
1954                 c->isdbt_sb_mode = data;
1955                 break;
1956         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1957                 c->isdbt_sb_subchannel = data;
1958                 break;
1959         case DTV_ISDBT_SB_SEGMENT_IDX:
1960                 c->isdbt_sb_segment_idx = data;
1961                 break;
1962         case DTV_ISDBT_SB_SEGMENT_COUNT:
1963                 c->isdbt_sb_segment_count = data;
1964                 break;
1965         case DTV_ISDBT_LAYER_ENABLED:
1966                 c->isdbt_layer_enabled = data;
1967                 break;
1968         case DTV_ISDBT_LAYERA_FEC:
1969                 c->layer[0].fec = data;
1970                 break;
1971         case DTV_ISDBT_LAYERA_MODULATION:
1972                 c->layer[0].modulation = data;
1973                 break;
1974         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1975                 c->layer[0].segment_count = data;
1976                 break;
1977         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1978                 c->layer[0].interleaving = data;
1979                 break;
1980         case DTV_ISDBT_LAYERB_FEC:
1981                 c->layer[1].fec = data;
1982                 break;
1983         case DTV_ISDBT_LAYERB_MODULATION:
1984                 c->layer[1].modulation = data;
1985                 break;
1986         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1987                 c->layer[1].segment_count = data;
1988                 break;
1989         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1990                 c->layer[1].interleaving = data;
1991                 break;
1992         case DTV_ISDBT_LAYERC_FEC:
1993                 c->layer[2].fec = data;
1994                 break;
1995         case DTV_ISDBT_LAYERC_MODULATION:
1996                 c->layer[2].modulation = data;
1997                 break;
1998         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1999                 c->layer[2].segment_count = data;
2000                 break;
2001         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2002                 c->layer[2].interleaving = data;
2003                 break;
2004
2005         /* Multistream support */
2006         case DTV_STREAM_ID:
2007         case DTV_DVBT2_PLP_ID_LEGACY:
2008                 c->stream_id = data;
2009                 break;
2010
2011         /* Physical layer scrambling support */
2012         case DTV_SCRAMBLING_SEQUENCE_INDEX:
2013                 c->scrambling_sequence_index = data;
2014                 break;
2015
2016         /* ATSC-MH */
2017         case DTV_ATSCMH_PARADE_ID:
2018                 fe->dtv_property_cache.atscmh_parade_id = data;
2019                 break;
2020         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2021                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2022                 break;
2023
2024         case DTV_LNA:
2025                 c->lna = data;
2026                 if (fe->ops.set_lna)
2027                         r = fe->ops.set_lna(fe);
2028                 if (r < 0)
2029                         c->lna = LNA_AUTO;
2030                 break;
2031
2032         default:
2033                 return -EINVAL;
2034         }
2035
2036         return r;
2037 }
2038
2039 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2040                                  void *parg)
2041 {
2042         struct dvb_device *dvbdev = file->private_data;
2043         struct dvb_frontend *fe = dvbdev->priv;
2044         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2045         int err;
2046
2047         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2048         if (down_interruptible(&fepriv->sem))
2049                 return -ERESTARTSYS;
2050
2051         if (fe->exit != DVB_FE_NO_EXIT) {
2052                 up(&fepriv->sem);
2053                 return -ENODEV;
2054         }
2055
2056         /*
2057          * If the frontend is opened in read-only mode, only the ioctls
2058          * that don't interfere with the tune logic should be accepted.
2059          * That allows an external application to monitor the DVB QoS and
2060          * statistics parameters.
2061          *
2062          * That matches all _IOR() ioctls, except for two special cases:
2063          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2064          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2065          *     setup
2066          * So, those two ioctls should also return -EPERM, as otherwise
2067          * reading from them would interfere with a DVB tune application
2068          */
2069         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2070             && (_IOC_DIR(cmd) != _IOC_READ
2071                 || cmd == FE_GET_EVENT
2072                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2073                 up(&fepriv->sem);
2074                 return -EPERM;
2075         }
2076
2077         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2078
2079         up(&fepriv->sem);
2080         return err;
2081 }
2082
2083 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2084                                unsigned long arg)
2085 {
2086         struct dvb_device *dvbdev = file->private_data;
2087
2088         if (!dvbdev)
2089                 return -ENODEV;
2090
2091         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2092 }
2093
2094 #ifdef CONFIG_COMPAT
2095 struct compat_dtv_property {
2096         __u32 cmd;
2097         __u32 reserved[3];
2098         union {
2099                 __u32 data;
2100                 struct dtv_fe_stats st;
2101                 struct {
2102                         __u8 data[32];
2103                         __u32 len;
2104                         __u32 reserved1[3];
2105                         compat_uptr_t reserved2;
2106                 } buffer;
2107         } u;
2108         int result;
2109 } __attribute__ ((packed));
2110
2111 struct compat_dtv_properties {
2112         __u32 num;
2113         compat_uptr_t props;
2114 };
2115
2116 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2117 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2118
2119 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2120                                             unsigned long arg)
2121 {
2122         struct dvb_device *dvbdev = file->private_data;
2123         struct dvb_frontend *fe = dvbdev->priv;
2124         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2125         int i, err = 0;
2126
2127         if (cmd == COMPAT_FE_SET_PROPERTY) {
2128                 struct compat_dtv_properties prop, *tvps = NULL;
2129                 struct compat_dtv_property *tvp = NULL;
2130
2131                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2132                         return -EFAULT;
2133
2134                 tvps = &prop;
2135
2136                 /*
2137                  * Put an arbitrary limit on the number of messages that can
2138                  * be sent at once
2139                  */
2140                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2141                         return -EINVAL;
2142
2143                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2144                 if (IS_ERR(tvp))
2145                         return PTR_ERR(tvp);
2146
2147                 for (i = 0; i < tvps->num; i++) {
2148                         err = dtv_property_process_set(fe, file,
2149                                                        (tvp + i)->cmd,
2150                                                        (tvp + i)->u.data);
2151                         if (err < 0) {
2152                                 kfree(tvp);
2153                                 return err;
2154                         }
2155                 }
2156                 kfree(tvp);
2157         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2158                 struct compat_dtv_properties prop, *tvps = NULL;
2159                 struct compat_dtv_property *tvp = NULL;
2160                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2161
2162                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2163                         return -EFAULT;
2164
2165                 tvps = &prop;
2166
2167                 /*
2168                  * Put an arbitrary limit on the number of messages that can
2169                  * be sent at once
2170                  */
2171                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2172                         return -EINVAL;
2173
2174                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2175                 if (IS_ERR(tvp))
2176                         return PTR_ERR(tvp);
2177
2178                 /*
2179                  * Let's use our own copy of property cache, in order to
2180                  * avoid mangling with DTV zigzag logic, as drivers might
2181                  * return crap, if they don't check if the data is available
2182                  * before updating the properties cache.
2183                  */
2184                 if (fepriv->state != FESTATE_IDLE) {
2185                         err = dtv_get_frontend(fe, &getp, NULL);
2186                         if (err < 0) {
2187                                 kfree(tvp);
2188                                 return err;
2189                         }
2190                 }
2191                 for (i = 0; i < tvps->num; i++) {
2192                         err = dtv_property_process_get(
2193                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2194                         if (err < 0) {
2195                                 kfree(tvp);
2196                                 return err;
2197                         }
2198                 }
2199
2200                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2201                                  tvps->num * sizeof(struct compat_dtv_property))) {
2202                         kfree(tvp);
2203                         return -EFAULT;
2204                 }
2205                 kfree(tvp);
2206         }
2207
2208         return err;
2209 }
2210
2211 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2212                                       unsigned long arg)
2213 {
2214         struct dvb_device *dvbdev = file->private_data;
2215         struct dvb_frontend *fe = dvbdev->priv;
2216         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2217         int err;
2218
2219         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2220                 if (down_interruptible(&fepriv->sem))
2221                         return -ERESTARTSYS;
2222
2223                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2224
2225                 up(&fepriv->sem);
2226                 return err;
2227         }
2228
2229         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2230 }
2231 #endif
2232
2233 static int dtv_set_frontend(struct dvb_frontend *fe)
2234 {
2235         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2236         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2237         u32 rolloff = 0;
2238
2239         if (dvb_frontend_check_parameters(fe) < 0)
2240                 return -EINVAL;
2241
2242         /*
2243          * Initialize output parameters to match the values given by
2244          * the user. FE_SET_FRONTEND triggers an initial frontend event
2245          * with status = 0, which copies output parameters to userspace.
2246          */
2247         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2248
2249         /*
2250          * Be sure that the bandwidth will be filled for all
2251          * non-satellite systems, as tuners need to know what
2252          * low pass/Nyquist half filter should be applied, in
2253          * order to avoid inter-channel noise.
2254          *
2255          * ISDB-T and DVB-T/T2 already sets bandwidth.
2256          * ATSC and DVB-C don't set, so, the core should fill it.
2257          *
2258          * On DVB-C Annex A and C, the bandwidth is a function of
2259          * the roll-off and symbol rate. Annex B defines different
2260          * roll-off factors depending on the modulation. Fortunately,
2261          * Annex B is only used with 6MHz, so there's no need to
2262          * calculate it.
2263          *
2264          * While not officially supported, a side effect of handling it at
2265          * the cache level is that a program could retrieve the bandwidth
2266          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2267          */
2268         switch (c->delivery_system) {
2269         case SYS_ATSC:
2270         case SYS_DVBC_ANNEX_B:
2271                 c->bandwidth_hz = 6000000;
2272                 break;
2273         case SYS_DVBC_ANNEX_A:
2274                 rolloff = 115;
2275                 break;
2276         case SYS_DVBC_ANNEX_C:
2277                 rolloff = 113;
2278                 break;
2279         case SYS_DVBS:
2280         case SYS_TURBO:
2281         case SYS_ISDBS:
2282                 rolloff = 135;
2283                 break;
2284         case SYS_DVBS2:
2285                 switch (c->rolloff) {
2286                 case ROLLOFF_20:
2287                         rolloff = 120;
2288                         break;
2289                 case ROLLOFF_25:
2290                         rolloff = 125;
2291                         break;
2292                 default:
2293                 case ROLLOFF_35:
2294                         rolloff = 135;
2295                 }
2296                 break;
2297         default:
2298                 break;
2299         }
2300         if (rolloff)
2301                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2302
2303         /* force auto frequency inversion if requested */
2304         if (dvb_force_auto_inversion)
2305                 c->inversion = INVERSION_AUTO;
2306
2307         /*
2308          * without hierarchical coding code_rate_LP is irrelevant,
2309          * so we tolerate the otherwise invalid FEC_NONE setting
2310          */
2311         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2312                 c->code_rate_LP = FEC_AUTO;
2313
2314         prepare_tuning_algo_parameters(fe);
2315
2316         fepriv->state = FESTATE_RETUNE;
2317
2318         /* Request the search algorithm to search */
2319         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2320
2321         dvb_frontend_clear_events(fe);
2322         dvb_frontend_add_event(fe, 0);
2323         dvb_frontend_wakeup(fe);
2324         fepriv->status = 0;
2325
2326         return 0;
2327 }
2328
2329 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2330                             struct dtv_properties *tvps)
2331 {
2332         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2333         struct dtv_property *tvp = NULL;
2334         struct dtv_frontend_properties getp;
2335         int i, err;
2336
2337         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2338
2339         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2340                 __func__, tvps->num);
2341         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2342                 __func__, tvps->props);
2343
2344         /*
2345          * Put an arbitrary limit on the number of messages that can
2346          * be sent at once
2347          */
2348         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2349                 return -EINVAL;
2350
2351         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2352         if (IS_ERR(tvp))
2353                 return PTR_ERR(tvp);
2354
2355         /*
2356          * Let's use our own copy of property cache, in order to
2357          * avoid mangling with DTV zigzag logic, as drivers might
2358          * return crap, if they don't check if the data is available
2359          * before updating the properties cache.
2360          */
2361         if (fepriv->state != FESTATE_IDLE) {
2362                 err = dtv_get_frontend(fe, &getp, NULL);
2363                 if (err < 0)
2364                         goto out;
2365         }
2366         for (i = 0; i < tvps->num; i++) {
2367                 err = dtv_property_process_get(fe, &getp,
2368                                                tvp + i, file);
2369                 if (err < 0)
2370                         goto out;
2371         }
2372
2373         if (copy_to_user((void __user *)tvps->props, tvp,
2374                          tvps->num * sizeof(struct dtv_property))) {
2375                 err = -EFAULT;
2376                 goto out;
2377         }
2378
2379         err = 0;
2380 out:
2381         kfree(tvp);
2382         return err;
2383 }
2384
2385 static int dvb_get_frontend(struct dvb_frontend *fe,
2386                             struct dvb_frontend_parameters *p_out)
2387 {
2388         struct dtv_frontend_properties getp;
2389
2390         /*
2391          * Let's use our own copy of property cache, in order to
2392          * avoid mangling with DTV zigzag logic, as drivers might
2393          * return crap, if they don't check if the data is available
2394          * before updating the properties cache.
2395          */
2396         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2397
2398         return dtv_get_frontend(fe, &getp, p_out);
2399 }
2400
2401 static int dvb_frontend_handle_ioctl(struct file *file,
2402                                      unsigned int cmd, void *parg)
2403 {
2404         struct dvb_device *dvbdev = file->private_data;
2405         struct dvb_frontend *fe = dvbdev->priv;
2406         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2407         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2408         int i, err = -ENOTSUPP;
2409
2410         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2411
2412         switch (cmd) {
2413         case FE_SET_PROPERTY: {
2414                 struct dtv_properties *tvps = parg;
2415                 struct dtv_property *tvp = NULL;
2416
2417                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2418                         __func__, tvps->num);
2419                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2420                         __func__, tvps->props);
2421
2422                 /*
2423                  * Put an arbitrary limit on the number of messages that can
2424                  * be sent at once
2425                  */
2426                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2427                         return -EINVAL;
2428
2429                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2430                 if (IS_ERR(tvp))
2431                         return PTR_ERR(tvp);
2432
2433                 for (i = 0; i < tvps->num; i++) {
2434                         err = dtv_property_process_set(fe, file,
2435                                                        (tvp + i)->cmd,
2436                                                        (tvp + i)->u.data);
2437                         if (err < 0) {
2438                                 kfree(tvp);
2439                                 return err;
2440                         }
2441                 }
2442                 kfree(tvp);
2443                 err = 0;
2444                 break;
2445         }
2446         case FE_GET_PROPERTY:
2447                 err = dvb_get_property(fe, file, parg);
2448                 break;
2449
2450         case FE_GET_INFO: {
2451                 struct dvb_frontend_info *info = parg;
2452                 memset(info, 0, sizeof(*info));
2453
2454                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2455                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2456                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2457                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2458                 info->caps = fe->ops.info.caps;
2459                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2460                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2461                                                   &info->frequency_max,
2462                                                   &info->frequency_tolerance);
2463
2464                 /*
2465                  * Associate the 4 delivery systems supported by DVBv3
2466                  * API with their DVBv5 counterpart. For the other standards,
2467                  * use the closest type, assuming that it would hopefully
2468                  * work with a DVBv3 application.
2469                  * It should be noticed that, on multi-frontend devices with
2470                  * different types (terrestrial and cable, for example),
2471                  * a pure DVBv3 application won't be able to use all delivery
2472                  * systems. Yet, changing the DVBv5 cache to the other delivery
2473                  * system should be enough for making it work.
2474                  */
2475                 switch (dvbv3_type(c->delivery_system)) {
2476                 case DVBV3_QPSK:
2477                         info->type = FE_QPSK;
2478                         break;
2479                 case DVBV3_ATSC:
2480                         info->type = FE_ATSC;
2481                         break;
2482                 case DVBV3_QAM:
2483                         info->type = FE_QAM;
2484                         break;
2485                 case DVBV3_OFDM:
2486                         info->type = FE_OFDM;
2487                         break;
2488                 default:
2489                         dev_err(fe->dvb->device,
2490                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2491                                 __func__, c->delivery_system);
2492                         info->type = FE_OFDM;
2493                 }
2494                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2495                         __func__, c->delivery_system, info->type);
2496
2497                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2498                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2499                         info->caps |= FE_CAN_INVERSION_AUTO;
2500                 err = 0;
2501                 break;
2502         }
2503
2504         case FE_READ_STATUS: {
2505                 enum fe_status *status = parg;
2506
2507                 /* if retune was requested but hasn't occurred yet, prevent
2508                  * that user get signal state from previous tuning */
2509                 if (fepriv->state == FESTATE_RETUNE ||
2510                     fepriv->state == FESTATE_ERROR) {
2511                         err = 0;
2512                         *status = 0;
2513                         break;
2514                 }
2515
2516                 if (fe->ops.read_status)
2517                         err = fe->ops.read_status(fe, status);
2518                 break;
2519         }
2520
2521         case FE_DISEQC_RESET_OVERLOAD:
2522                 if (fe->ops.diseqc_reset_overload) {
2523                         err = fe->ops.diseqc_reset_overload(fe);
2524                         fepriv->state = FESTATE_DISEQC;
2525                         fepriv->status = 0;
2526                 }
2527                 break;
2528
2529         case FE_DISEQC_SEND_MASTER_CMD:
2530                 if (fe->ops.diseqc_send_master_cmd) {
2531                         struct dvb_diseqc_master_cmd *cmd = parg;
2532
2533                         if (cmd->msg_len > sizeof(cmd->msg)) {
2534                                 err = -EINVAL;
2535                                 break;
2536                         }
2537                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2538                         fepriv->state = FESTATE_DISEQC;
2539                         fepriv->status = 0;
2540                 }
2541                 break;
2542
2543         case FE_DISEQC_SEND_BURST:
2544                 if (fe->ops.diseqc_send_burst) {
2545                         err = fe->ops.diseqc_send_burst(fe,
2546                                                 (enum fe_sec_mini_cmd)parg);
2547                         fepriv->state = FESTATE_DISEQC;
2548                         fepriv->status = 0;
2549                 }
2550                 break;
2551
2552         case FE_SET_TONE:
2553                 if (fe->ops.set_tone) {
2554                         err = fe->ops.set_tone(fe,
2555                                                (enum fe_sec_tone_mode)parg);
2556                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2557                         fepriv->state = FESTATE_DISEQC;
2558                         fepriv->status = 0;
2559                 }
2560                 break;
2561
2562         case FE_SET_VOLTAGE:
2563                 if (fe->ops.set_voltage) {
2564                         err = fe->ops.set_voltage(fe,
2565                                                   (enum fe_sec_voltage)parg);
2566                         fepriv->voltage = (enum fe_sec_voltage)parg;
2567                         fepriv->state = FESTATE_DISEQC;
2568                         fepriv->status = 0;
2569                 }
2570                 break;
2571
2572         case FE_DISEQC_RECV_SLAVE_REPLY:
2573                 if (fe->ops.diseqc_recv_slave_reply)
2574                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2575                 break;
2576
2577         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2578                 if (fe->ops.enable_high_lnb_voltage)
2579                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2580                 break;
2581
2582         case FE_SET_FRONTEND_TUNE_MODE:
2583                 fepriv->tune_mode_flags = (unsigned long)parg;
2584                 err = 0;
2585                 break;
2586         /* DEPRECATED dish control ioctls */
2587
2588         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2589                 if (fe->ops.dishnetwork_send_legacy_command) {
2590                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2591                                                          (unsigned long)parg);
2592                         fepriv->state = FESTATE_DISEQC;
2593                         fepriv->status = 0;
2594                 } else if (fe->ops.set_voltage) {
2595                         /*
2596                          * NOTE: This is a fallback condition.  Some frontends
2597                          * (stv0299 for instance) take longer than 8msec to
2598                          * respond to a set_voltage command.  Those switches
2599                          * need custom routines to switch properly.  For all
2600                          * other frontends, the following should work ok.
2601                          * Dish network legacy switches (as used by Dish500)
2602                          * are controlled by sending 9-bit command words
2603                          * spaced 8msec apart.
2604                          * the actual command word is switch/port dependent
2605                          * so it is up to the userspace application to send
2606                          * the right command.
2607                          * The command must always start with a '0' after
2608                          * initialization, so parg is 8 bits and does not
2609                          * include the initialization or start bit
2610                          */
2611                         unsigned long swcmd = ((unsigned long)parg) << 1;
2612                         ktime_t nexttime;
2613                         ktime_t tv[10];
2614                         int i;
2615                         u8 last = 1;
2616
2617                         if (dvb_frontend_debug)
2618                                 dprintk("switch command: 0x%04lx\n",
2619                                         swcmd);
2620                         nexttime = ktime_get_boottime();
2621                         if (dvb_frontend_debug)
2622                                 tv[0] = nexttime;
2623                         /* before sending a command, initialize by sending
2624                          * a 32ms 18V to the switch
2625                          */
2626                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2627                         dvb_frontend_sleep_until(&nexttime, 32000);
2628
2629                         for (i = 0; i < 9; i++) {
2630                                 if (dvb_frontend_debug)
2631                                         tv[i + 1] = ktime_get_boottime();
2632                                 if ((swcmd & 0x01) != last) {
2633                                         /* set voltage to (last ? 13V : 18V) */
2634                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2635                                         last = (last) ? 0 : 1;
2636                                 }
2637                                 swcmd = swcmd >> 1;
2638                                 if (i != 8)
2639                                         dvb_frontend_sleep_until(&nexttime, 8000);
2640                         }
2641                         if (dvb_frontend_debug) {
2642                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2643                                         fe->dvb->num);
2644                                 for (i = 1; i < 10; i++)
2645                                         pr_info("%d: %d\n", i,
2646                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2647                         }
2648                         err = 0;
2649                         fepriv->state = FESTATE_DISEQC;
2650                         fepriv->status = 0;
2651                 }
2652                 break;
2653
2654         /* DEPRECATED statistics ioctls */
2655
2656         case FE_READ_BER:
2657                 if (fe->ops.read_ber) {
2658                         if (fepriv->thread)
2659                                 err = fe->ops.read_ber(fe, parg);
2660                         else
2661                                 err = -EAGAIN;
2662                 }
2663                 break;
2664
2665         case FE_READ_SIGNAL_STRENGTH:
2666                 if (fe->ops.read_signal_strength) {
2667                         if (fepriv->thread)
2668                                 err = fe->ops.read_signal_strength(fe, parg);
2669                         else
2670                                 err = -EAGAIN;
2671                 }
2672                 break;
2673
2674         case FE_READ_SNR:
2675                 if (fe->ops.read_snr) {
2676                         if (fepriv->thread)
2677                                 err = fe->ops.read_snr(fe, parg);
2678                         else
2679                                 err = -EAGAIN;
2680                 }
2681                 break;
2682
2683         case FE_READ_UNCORRECTED_BLOCKS:
2684                 if (fe->ops.read_ucblocks) {
2685                         if (fepriv->thread)
2686                                 err = fe->ops.read_ucblocks(fe, parg);
2687                         else
2688                                 err = -EAGAIN;
2689                 }
2690                 break;
2691
2692         /* DEPRECATED DVBv3 ioctls */
2693
2694         case FE_SET_FRONTEND:
2695                 err = dvbv3_set_delivery_system(fe);
2696                 if (err)
2697                         break;
2698
2699                 err = dtv_property_cache_sync(fe, c, parg);
2700                 if (err)
2701                         break;
2702                 err = dtv_set_frontend(fe);
2703                 break;
2704
2705         case FE_GET_EVENT:
2706                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2707                 break;
2708
2709         case FE_GET_FRONTEND:
2710                 err = dvb_get_frontend(fe, parg);
2711                 break;
2712
2713         default:
2714                 return -ENOTSUPP;
2715         } /* switch */
2716
2717         return err;
2718 }
2719
2720 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2721 {
2722         struct dvb_device *dvbdev = file->private_data;
2723         struct dvb_frontend *fe = dvbdev->priv;
2724         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2725
2726         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2727
2728         poll_wait(file, &fepriv->events.wait_queue, wait);
2729
2730         if (fepriv->events.eventw != fepriv->events.eventr)
2731                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2732
2733         return 0;
2734 }
2735
2736 static int dvb_frontend_open(struct inode *inode, struct file *file)
2737 {
2738         struct dvb_device *dvbdev = file->private_data;
2739         struct dvb_frontend *fe = dvbdev->priv;
2740         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2741         struct dvb_adapter *adapter = fe->dvb;
2742         int ret;
2743
2744         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2745         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2746                 return -ENODEV;
2747
2748         if (adapter->mfe_shared) {
2749                 mutex_lock(&adapter->mfe_lock);
2750
2751                 if (!adapter->mfe_dvbdev)
2752                         adapter->mfe_dvbdev = dvbdev;
2753
2754                 else if (adapter->mfe_dvbdev != dvbdev) {
2755                         struct dvb_device
2756                                 *mfedev = adapter->mfe_dvbdev;
2757                         struct dvb_frontend
2758                                 *mfe = mfedev->priv;
2759                         struct dvb_frontend_private
2760                                 *mfepriv = mfe->frontend_priv;
2761                         int mferetry = (dvb_mfe_wait_time << 1);
2762
2763                         mutex_unlock(&adapter->mfe_lock);
2764                         while (mferetry-- && (mfedev->users != -1 ||
2765                                               mfepriv->thread)) {
2766                                 if (msleep_interruptible(500)) {
2767                                         if (signal_pending(current))
2768                                                 return -EINTR;
2769                                 }
2770                         }
2771
2772                         mutex_lock(&adapter->mfe_lock);
2773                         if (adapter->mfe_dvbdev != dvbdev) {
2774                                 mfedev = adapter->mfe_dvbdev;
2775                                 mfe = mfedev->priv;
2776                                 mfepriv = mfe->frontend_priv;
2777                                 if (mfedev->users != -1 ||
2778                                     mfepriv->thread) {
2779                                         mutex_unlock(&adapter->mfe_lock);
2780                                         return -EBUSY;
2781                                 }
2782                                 adapter->mfe_dvbdev = dvbdev;
2783                         }
2784                 }
2785         }
2786
2787         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2788                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2789                         goto err0;
2790
2791                 /* If we took control of the bus, we need to force
2792                    reinitialization.  This is because many ts_bus_ctrl()
2793                    functions strobe the RESET pin on the demod, and if the
2794                    frontend thread already exists then the dvb_init() routine
2795                    won't get called (which is what usually does initial
2796                    register configuration). */
2797                 fepriv->reinitialise = 1;
2798         }
2799
2800         if ((ret = dvb_generic_open(inode, file)) < 0)
2801                 goto err1;
2802
2803         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2804                 /* normal tune mode when opened R/W */
2805                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2806                 fepriv->tone = -1;
2807                 fepriv->voltage = -1;
2808
2809 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2810                 mutex_lock(&fe->dvb->mdev_lock);
2811                 if (fe->dvb->mdev) {
2812                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2813                         if (fe->dvb->mdev->enable_source)
2814                                 ret = fe->dvb->mdev->enable_source(
2815                                                            dvbdev->entity,
2816                                                            &fepriv->pipe);
2817                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2818                         if (ret) {
2819                                 mutex_unlock(&fe->dvb->mdev_lock);
2820                                 dev_err(fe->dvb->device,
2821                                         "Tuner is busy. Error %d\n", ret);
2822                                 goto err2;
2823                         }
2824                 }
2825                 mutex_unlock(&fe->dvb->mdev_lock);
2826 #endif
2827                 ret = dvb_frontend_start(fe);
2828                 if (ret)
2829                         goto err3;
2830
2831                 /*  empty event queue */
2832                 fepriv->events.eventr = fepriv->events.eventw = 0;
2833         }
2834
2835         dvb_frontend_get(fe);
2836
2837         if (adapter->mfe_shared)
2838                 mutex_unlock(&adapter->mfe_lock);
2839         return ret;
2840
2841 err3:
2842 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2843         mutex_lock(&fe->dvb->mdev_lock);
2844         if (fe->dvb->mdev) {
2845                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2846                 if (fe->dvb->mdev->disable_source)
2847                         fe->dvb->mdev->disable_source(dvbdev->entity);
2848                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2849         }
2850         mutex_unlock(&fe->dvb->mdev_lock);
2851 err2:
2852 #endif
2853         dvb_generic_release(inode, file);
2854 err1:
2855         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2856                 fe->ops.ts_bus_ctrl(fe, 0);
2857 err0:
2858         if (adapter->mfe_shared)
2859                 mutex_unlock(&adapter->mfe_lock);
2860         return ret;
2861 }
2862
2863 static int dvb_frontend_release(struct inode *inode, struct file *file)
2864 {
2865         struct dvb_device *dvbdev = file->private_data;
2866         struct dvb_frontend *fe = dvbdev->priv;
2867         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2868         int ret;
2869
2870         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2871
2872         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2873                 fepriv->release_jiffies = jiffies;
2874                 mb();
2875         }
2876
2877         ret = dvb_generic_release(inode, file);
2878
2879         if (dvbdev->users == -1) {
2880                 wake_up(&fepriv->wait_queue);
2881 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2882                 mutex_lock(&fe->dvb->mdev_lock);
2883                 if (fe->dvb->mdev) {
2884                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2885                         if (fe->dvb->mdev->disable_source)
2886                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2887                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2888                 }
2889                 mutex_unlock(&fe->dvb->mdev_lock);
2890 #endif
2891                 if (fe->exit != DVB_FE_NO_EXIT)
2892                         wake_up(&dvbdev->wait_queue);
2893                 if (fe->ops.ts_bus_ctrl)
2894                         fe->ops.ts_bus_ctrl(fe, 0);
2895         }
2896
2897         dvb_frontend_put(fe);
2898
2899         return ret;
2900 }
2901
2902 static const struct file_operations dvb_frontend_fops = {
2903         .owner          = THIS_MODULE,
2904         .unlocked_ioctl = dvb_frontend_ioctl,
2905 #ifdef CONFIG_COMPAT
2906         .compat_ioctl   = dvb_frontend_compat_ioctl,
2907 #endif
2908         .poll           = dvb_frontend_poll,
2909         .open           = dvb_frontend_open,
2910         .release        = dvb_frontend_release,
2911         .llseek         = noop_llseek,
2912 };
2913
2914 int dvb_frontend_suspend(struct dvb_frontend *fe)
2915 {
2916         int ret = 0;
2917
2918         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2919                 fe->id);
2920
2921         if (fe->ops.tuner_ops.suspend)
2922                 ret = fe->ops.tuner_ops.suspend(fe);
2923         else if (fe->ops.tuner_ops.sleep)
2924                 ret = fe->ops.tuner_ops.sleep(fe);
2925
2926         if (fe->ops.sleep)
2927                 ret = fe->ops.sleep(fe);
2928
2929         return ret;
2930 }
2931 EXPORT_SYMBOL(dvb_frontend_suspend);
2932
2933 int dvb_frontend_resume(struct dvb_frontend *fe)
2934 {
2935         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2936         int ret = 0;
2937
2938         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2939                 fe->id);
2940
2941         fe->exit = DVB_FE_DEVICE_RESUME;
2942         if (fe->ops.init)
2943                 ret = fe->ops.init(fe);
2944
2945         if (fe->ops.tuner_ops.resume)
2946                 ret = fe->ops.tuner_ops.resume(fe);
2947         else if (fe->ops.tuner_ops.init)
2948                 ret = fe->ops.tuner_ops.init(fe);
2949
2950         if (fe->ops.set_tone && fepriv->tone != -1)
2951                 fe->ops.set_tone(fe, fepriv->tone);
2952         if (fe->ops.set_voltage && fepriv->voltage != -1)
2953                 fe->ops.set_voltage(fe, fepriv->voltage);
2954
2955         fe->exit = DVB_FE_NO_EXIT;
2956         fepriv->state = FESTATE_RETUNE;
2957         dvb_frontend_wakeup(fe);
2958
2959         return ret;
2960 }
2961 EXPORT_SYMBOL(dvb_frontend_resume);
2962
2963 int dvb_register_frontend(struct dvb_adapter *dvb,
2964                           struct dvb_frontend *fe)
2965 {
2966         struct dvb_frontend_private *fepriv;
2967         const struct dvb_device dvbdev_template = {
2968                 .users = ~0,
2969                 .writers = 1,
2970                 .readers = (~0) - 1,
2971                 .fops = &dvb_frontend_fops,
2972 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2973                 .name = fe->ops.info.name,
2974 #endif
2975         };
2976
2977         dev_dbg(dvb->device, "%s:\n", __func__);
2978
2979         if (mutex_lock_interruptible(&frontend_mutex))
2980                 return -ERESTARTSYS;
2981
2982         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2983         if (!fe->frontend_priv) {
2984                 mutex_unlock(&frontend_mutex);
2985                 return -ENOMEM;
2986         }
2987         fepriv = fe->frontend_priv;
2988
2989         kref_init(&fe->refcount);
2990
2991         /*
2992          * After initialization, there need to be two references: one
2993          * for dvb_unregister_frontend(), and another one for
2994          * dvb_frontend_detach().
2995          */
2996         dvb_frontend_get(fe);
2997
2998         sema_init(&fepriv->sem, 1);
2999         init_waitqueue_head(&fepriv->wait_queue);
3000         init_waitqueue_head(&fepriv->events.wait_queue);
3001         mutex_init(&fepriv->events.mtx);
3002         fe->dvb = dvb;
3003         fepriv->inversion = INVERSION_OFF;
3004
3005         dev_info(fe->dvb->device,
3006                  "DVB: registering adapter %i frontend %i (%s)...\n",
3007                  fe->dvb->num, fe->id, fe->ops.info.name);
3008
3009         dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3010                             fe, DVB_DEVICE_FRONTEND, 0);
3011
3012         /*
3013          * Initialize the cache to the proper values according with the
3014          * first supported delivery system (ops->delsys[0])
3015          */
3016
3017         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3018         dvb_frontend_clear_cache(fe);
3019
3020         mutex_unlock(&frontend_mutex);
3021         return 0;
3022 }
3023 EXPORT_SYMBOL(dvb_register_frontend);
3024
3025 int dvb_unregister_frontend(struct dvb_frontend *fe)
3026 {
3027         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3028
3029         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3030
3031         mutex_lock(&frontend_mutex);
3032         dvb_frontend_stop(fe);
3033         dvb_remove_device(fepriv->dvbdev);
3034
3035         /* fe is invalid now */
3036         mutex_unlock(&frontend_mutex);
3037         dvb_frontend_put(fe);
3038         return 0;
3039 }
3040 EXPORT_SYMBOL(dvb_unregister_frontend);
3041
3042 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3043                                         void (*release)(struct dvb_frontend *fe))
3044 {
3045         if (release) {
3046                 release(fe);
3047 #ifdef CONFIG_MEDIA_ATTACH
3048                 dvb_detach(release);
3049 #endif
3050         }
3051 }
3052
3053 void dvb_frontend_detach(struct dvb_frontend *fe)
3054 {
3055         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3056         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3057         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3058         dvb_frontend_put(fe);
3059 }
3060 EXPORT_SYMBOL(dvb_frontend_detach);