drivers/media/dvb-core/dvb_frontend.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dvb_frontend.c: DVB frontend tuning interface/thread
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  */
  12
  13 /* Enables DVBv3 compatibility bits at the headers */
  14 #define __DVB_CORE__
  15
  16 #define pr_fmt(fmt) "dvb_frontend: " fmt
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/wait.h>
  22 #include <linux/slab.h>
  23 #include <linux/poll.h>
  24 #include <linux/semaphore.h>
  25 #include <linux/module.h>
  26 #include <linux/nospec.h>
  27 #include <linux/list.h>
  28 #include <linux/freezer.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/kthread.h>
  31 #include <linux/ktime.h>
  32 #include <linux/compat.h>
  33 #include <asm/processor.h>
  34
  35 #include <media/dvb_frontend.h>
  36 #include <media/dvbdev.h>
  37 #include <linux/dvb/version.h>
  38
  39 static int dvb_frontend_debug;
  40 static int dvb_shutdown_timeout;
  41 static int dvb_force_auto_inversion;
  42 static int dvb_override_tune_delay;
  43 static int dvb_powerdown_on_sleep = 1;
  44 static int dvb_mfe_wait_time = 5;
  45
  46 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  47 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  48 module_param(dvb_shutdown_timeout, int, 0644);
  49 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  50 module_param(dvb_force_auto_inversion, int, 0644);
  51 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  52 module_param(dvb_override_tune_delay, int, 0644);
  53 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  54 module_param(dvb_powerdown_on_sleep, int, 0644);
  55 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  56 module_param(dvb_mfe_wait_time, int, 0644);
  57 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  58
  59 #define dprintk(fmt, arg...) \
  60         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  61
  62 #define FESTATE_IDLE 1
  63 #define FESTATE_RETUNE 2
  64 #define FESTATE_TUNING_FAST 4
  65 #define FESTATE_TUNING_SLOW 8
  66 #define FESTATE_TUNED 16
  67 #define FESTATE_ZIGZAG_FAST 32
  68 #define FESTATE_ZIGZAG_SLOW 64
  69 #define FESTATE_DISEQC 128
  70 #define FESTATE_ERROR 256
  71 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  72 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  73 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  74 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  75
  76 /*
  77  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  78  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  79  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  80  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  81  * FESTATE_TUNED. The frontend has successfully locked on.
  82  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  83  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  84  * FESTATE_DISEQC. A DISEQC command has just been issued.
  85  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  86  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  87  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  88  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  89  */
  90
  91 static DEFINE_MUTEX(frontend_mutex);
  92
  93 struct dvb_frontend_private {
  94         /* thread/frontend values */
  95         struct dvb_device *dvbdev;
  96         struct dvb_frontend_parameters parameters_out;
  97         struct dvb_fe_events events;
  98         struct semaphore sem;
  99         struct list_head list_head;
 100         wait_queue_head_t wait_queue;
 101         struct task_struct *thread;
 102         unsigned long release_jiffies;
 103         unsigned int wakeup;
 104         enum fe_status status;
 105         unsigned long tune_mode_flags;
 106         unsigned int delay;
 107         unsigned int reinitialise;
 108         int tone;
 109         int voltage;
 110
 111         /* swzigzag values */
 112         unsigned int state;
 113         unsigned int bending;
 114         int lnb_drift;
 115         unsigned int inversion;
 116         unsigned int auto_step;
 117         unsigned int auto_sub_step;
 118         unsigned int started_auto_step;
 119         unsigned int min_delay;
 120         unsigned int max_drift;
 121         unsigned int step_size;
 122         int quality;
 123         unsigned int check_wrapped;
 124         enum dvbfe_search algo_status;
 125
 126 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 127         struct media_pipeline pipe;
 128 #endif
 129 };
 130
 131 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 132                                         void (*release)(struct dvb_frontend *fe));
 133
 134 static void __dvb_frontend_free(struct dvb_frontend *fe)
 135 {
 136         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 137
 138         if (fepriv)
 139                 dvb_device_put(fepriv->dvbdev);
 140
 141         dvb_frontend_invoke_release(fe, fe->ops.release);
 142
 143         kfree(fepriv);
 144 }
 145
 146 static void dvb_frontend_free(struct kref *ref)
 147 {
 148         struct dvb_frontend *fe =
 149                 container_of(ref, struct dvb_frontend, refcount);
 150
 151         __dvb_frontend_free(fe);
 152 }
 153
 154 static void dvb_frontend_put(struct dvb_frontend *fe)
 155 {
 156         /* call detach before dropping the reference count */
 157         if (fe->ops.detach)
 158                 fe->ops.detach(fe);
 159         /*
 160          * Check if the frontend was registered, as otherwise
 161          * kref was not initialized yet.
 162          */
 163         if (fe->frontend_priv)
 164                 kref_put(&fe->refcount, dvb_frontend_free);
 165         else
 166                 __dvb_frontend_free(fe);
 167 }
 168
 169 static void dvb_frontend_get(struct dvb_frontend *fe)
 170 {
 171         kref_get(&fe->refcount);
 172 }
 173
 174 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 175 static int dtv_get_frontend(struct dvb_frontend *fe,
 176                             struct dtv_frontend_properties *c,
 177                             struct dvb_frontend_parameters *p_out);
 178 static int
 179 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 180                                 const struct dtv_frontend_properties *c,
 181                                 struct dvb_frontend_parameters *p);
 182
 183 static bool has_get_frontend(struct dvb_frontend *fe)
 184 {
 185         return fe->ops.get_frontend;
 186 }
 187
 188 /*
 189  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 190  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 191  * otherwise, a DVBv3 call will fail.
 192  */
 193 enum dvbv3_emulation_type {
 194         DVBV3_UNKNOWN,
 195         DVBV3_QPSK,
 196         DVBV3_QAM,
 197         DVBV3_OFDM,
 198         DVBV3_ATSC,
 199 };
 200
 201 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 202 {
 203         switch (delivery_system) {
 204         case SYS_DVBC_ANNEX_A:
 205         case SYS_DVBC_ANNEX_C:
 206                 return DVBV3_QAM;
 207         case SYS_DVBS:
 208         case SYS_DVBS2:
 209         case SYS_TURBO:
 210         case SYS_ISDBS:
 211         case SYS_DSS:
 212                 return DVBV3_QPSK;
 213         case SYS_DVBT:
 214         case SYS_DVBT2:
 215         case SYS_ISDBT:
 216         case SYS_DTMB:
 217                 return DVBV3_OFDM;
 218         case SYS_ATSC:
 219         case SYS_ATSCMH:
 220         case SYS_DVBC_ANNEX_B:
 221                 return DVBV3_ATSC;
 222         case SYS_UNDEFINED:
 223         case SYS_ISDBC:
 224         case SYS_DVBH:
 225         case SYS_DAB:
 226         default:
 227                 /*
 228                  * Doesn't know how to emulate those types and/or
 229                  * there's no frontend driver from this type yet
 230                  * with some emulation code, so, we're not sure yet how
 231                  * to handle them, or they're not compatible with a DVBv3 call.
 232                  */
 233                 return DVBV3_UNKNOWN;
 234         }
 235 }
 236
 237 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 238                                    enum fe_status status)
 239 {
 240         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 241         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 242         struct dvb_fe_events *events = &fepriv->events;
 243         struct dvb_frontend_event *e;
 244         int wp;
 245
 246         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 247
 248         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 249                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 250
 251         mutex_lock(&events->mtx);
 252
 253         wp = (events->eventw + 1) % MAX_EVENT;
 254         if (wp == events->eventr) {
 255                 events->overflow = 1;
 256                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 257         }
 258
 259         e = &events->events[events->eventw];
 260         e->status = status;
 261         e->parameters = fepriv->parameters_out;
 262
 263         events->eventw = wp;
 264
 265         mutex_unlock(&events->mtx);
 266
 267         wake_up_interruptible(&events->wait_queue);
 268 }
 269
 270 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 271                                    struct dvb_fe_events *events)
 272 {
 273         int ret;
 274
 275         up(&fepriv->sem);
 276         ret = events->eventw != events->eventr;
 277         down(&fepriv->sem);
 278
 279         return ret;
 280 }
 281
 282 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 283                                   struct dvb_frontend_event *event, int flags)
 284 {
 285         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 286         struct dvb_fe_events *events = &fepriv->events;
 287
 288         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 289
 290         if (events->overflow) {
 291                 events->overflow = 0;
 292                 return -EOVERFLOW;
 293         }
 294
 295         if (events->eventw == events->eventr) {
 296                 int ret;
 297
 298                 if (flags & O_NONBLOCK)
 299                         return -EWOULDBLOCK;
 300
 301                 ret = wait_event_interruptible(events->wait_queue,
 302                                                dvb_frontend_test_event(fepriv, events));
 303
 304                 if (ret < 0)
 305                         return ret;
 306         }
 307
 308         mutex_lock(&events->mtx);
 309         *event = events->events[events->eventr];
 310         events->eventr = (events->eventr + 1) % MAX_EVENT;
 311         mutex_unlock(&events->mtx);
 312
 313         return 0;
 314 }
 315
 316 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 317 {
 318         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 319         struct dvb_fe_events *events = &fepriv->events;
 320
 321         mutex_lock(&events->mtx);
 322         events->eventr = events->eventw;
 323         mutex_unlock(&events->mtx);
 324 }
 325
 326 static void dvb_frontend_init(struct dvb_frontend *fe)
 327 {
 328         dev_dbg(fe->dvb->device,
 329                 "%s: initialising adapter %i frontend %i (%s)...\n",
 330                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 331
 332         if (fe->ops.init)
 333                 fe->ops.init(fe);
 334         if (fe->ops.tuner_ops.init) {
 335                 if (fe->ops.i2c_gate_ctrl)
 336                         fe->ops.i2c_gate_ctrl(fe, 1);
 337                 fe->ops.tuner_ops.init(fe);
 338                 if (fe->ops.i2c_gate_ctrl)
 339                         fe->ops.i2c_gate_ctrl(fe, 0);
 340         }
 341 }
 342
 343 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 344 {
 345         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 346
 347         fepriv->reinitialise = 1;
 348         dvb_frontend_wakeup(fe);
 349 }
 350 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 351
 352 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 353 {
 354         int q2;
 355         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 356
 357         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 358
 359         if (locked)
 360                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 361         else
 362                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 363
 364         q2 = fepriv->quality - 128;
 365         q2 *= q2;
 366
 367         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 368 }
 369
 370 /**
 371  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 372  *      parameters.
 373  *
 374  * @fe: The frontend concerned.
 375  * @check_wrapped: Checks if an iteration has completed.
 376  *                 DO NOT SET ON THE FIRST ATTEMPT.
 377  *
 378  * return: Number of complete iterations that have been performed.
 379  */
 380 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 381 {
 382         int autoinversion;
 383         int ready = 0;
 384         int fe_set_err = 0;
 385         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 386         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 387         int original_inversion = c->inversion;
 388         u32 original_frequency = c->frequency;
 389
 390         /* are we using autoinversion? */
 391         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 392                          (c->inversion == INVERSION_AUTO));
 393
 394         /* setup parameters correctly */
 395         while (!ready) {
 396                 /* calculate the lnb_drift */
 397                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 398
 399                 /* wrap the auto_step if we've exceeded the maximum drift */
 400                 if (fepriv->lnb_drift > fepriv->max_drift) {
 401                         fepriv->auto_step = 0;
 402                         fepriv->auto_sub_step = 0;
 403                         fepriv->lnb_drift = 0;
 404                 }
 405
 406                 /* perform inversion and +/- zigzag */
 407                 switch (fepriv->auto_sub_step) {
 408                 case 0:
 409                         /* try with the current inversion and current drift setting */
 410                         ready = 1;
 411                         break;
 412
 413                 case 1:
 414                         if (!autoinversion) break;
 415
 416                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 417                         ready = 1;
 418                         break;
 419
 420                 case 2:
 421                         if (fepriv->lnb_drift == 0) break;
 422
 423                         fepriv->lnb_drift = -fepriv->lnb_drift;
 424                         ready = 1;
 425                         break;
 426
 427                 case 3:
 428                         if (fepriv->lnb_drift == 0) break;
 429                         if (!autoinversion) break;
 430
 431                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 432                         fepriv->lnb_drift = -fepriv->lnb_drift;
 433                         ready = 1;
 434                         break;
 435
 436                 default:
 437                         fepriv->auto_step++;
 438                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 439                         break;
 440                 }
 441
 442                 if (!ready) fepriv->auto_sub_step++;
 443         }
 444
 445         /* if this attempt would hit where we started, indicate a complete
 446          * iteration has occurred */
 447         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 448             (fepriv->auto_sub_step == 0) && check_wrapped) {
 449                 return 1;
 450         }
 451
 452         dev_dbg(fe->dvb->device,
 453                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 454                 __func__, fepriv->lnb_drift, fepriv->inversion,
 455                 fepriv->auto_step, fepriv->auto_sub_step,
 456                 fepriv->started_auto_step);
 457
 458         /* set the frontend itself */
 459         c->frequency += fepriv->lnb_drift;
 460         if (autoinversion)
 461                 c->inversion = fepriv->inversion;
 462         tmp = *c;
 463         if (fe->ops.set_frontend)
 464                 fe_set_err = fe->ops.set_frontend(fe);
 465         *c = tmp;
 466         if (fe_set_err < 0) {
 467                 fepriv->state = FESTATE_ERROR;
 468                 return fe_set_err;
 469         }
 470
 471         c->frequency = original_frequency;
 472         c->inversion = original_inversion;
 473
 474         fepriv->auto_sub_step++;
 475         return 0;
 476 }
 477
 478 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 479 {
 480         enum fe_status s = FE_NONE;
 481         int retval = 0;
 482         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 483         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 484
 485         if (fepriv->max_drift)
 486                 dev_warn_once(fe->dvb->device,
 487                               "Frontend requested software zigzag, but didn't set the frequency step size\n");
 488
 489         /* if we've got no parameters, just keep idling */
 490         if (fepriv->state & FESTATE_IDLE) {
 491                 fepriv->delay = 3 * HZ;
 492                 fepriv->quality = 0;
 493                 return;
 494         }
 495
 496         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 497         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 498                 if (fepriv->state & FESTATE_RETUNE) {
 499                         tmp = *c;
 500                         if (fe->ops.set_frontend)
 501                                 retval = fe->ops.set_frontend(fe);
 502                         *c = tmp;
 503                         if (retval < 0)
 504                                 fepriv->state = FESTATE_ERROR;
 505                         else
 506                                 fepriv->state = FESTATE_TUNED;
 507                 }
 508                 fepriv->delay = 3 * HZ;
 509                 fepriv->quality = 0;
 510                 return;
 511         }
 512
 513         /* get the frontend status */
 514         if (fepriv->state & FESTATE_RETUNE) {
 515                 s = 0;
 516         } else {
 517                 if (fe->ops.read_status)
 518                         fe->ops.read_status(fe, &s);
 519                 if (s != fepriv->status) {
 520                         dvb_frontend_add_event(fe, s);
 521                         fepriv->status = s;
 522                 }
 523         }
 524
 525         /* if we're not tuned, and we have a lock, move to the TUNED state */
 526         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 527                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 528                 fepriv->state = FESTATE_TUNED;
 529
 530                 /* if we're tuned, then we have determined the correct inversion */
 531                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 532                     (c->inversion == INVERSION_AUTO)) {
 533                         c->inversion = fepriv->inversion;
 534                 }
 535                 return;
 536         }
 537
 538         /* if we are tuned already, check we're still locked */
 539         if (fepriv->state & FESTATE_TUNED) {
 540                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 541
 542                 /* we're tuned, and the lock is still good... */
 543                 if (s & FE_HAS_LOCK) {
 544                         return;
 545                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 546                         fepriv->state = FESTATE_ZIGZAG_FAST;
 547                         fepriv->started_auto_step = fepriv->auto_step;
 548                         fepriv->check_wrapped = 0;
 549                 }
 550         }
 551
 552         /* don't actually do anything if we're in the LOSTLOCK state,
 553          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 554         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 555             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 556                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 557                 return;
 558         }
 559
 560         /* don't do anything if we're in the DISEQC state, since this
 561          * might be someone with a motorized dish controlled by DISEQC.
 562          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 563         if (fepriv->state & FESTATE_DISEQC) {
 564                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 565                 return;
 566         }
 567
 568         /* if we're in the RETUNE state, set everything up for a brand
 569          * new scan, keeping the current inversion setting, as the next
 570          * tune is _very_ likely to require the same */
 571         if (fepriv->state & FESTATE_RETUNE) {
 572                 fepriv->lnb_drift = 0;
 573                 fepriv->auto_step = 0;
 574                 fepriv->auto_sub_step = 0;
 575                 fepriv->started_auto_step = 0;
 576                 fepriv->check_wrapped = 0;
 577         }
 578
 579         /* fast zigzag. */
 580         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 581                 fepriv->delay = fepriv->min_delay;
 582
 583                 /* perform a tune */
 584                 retval = dvb_frontend_swzigzag_autotune(fe,
 585                                                         fepriv->check_wrapped);
 586                 if (retval < 0) {
 587                         return;
 588                 } else if (retval) {
 589                         /* OK, if we've run out of trials at the fast speed.
 590                          * Drop back to slow for the _next_ attempt */
 591                         fepriv->state = FESTATE_SEARCHING_SLOW;
 592                         fepriv->started_auto_step = fepriv->auto_step;
 593                         return;
 594                 }
 595                 fepriv->check_wrapped = 1;
 596
 597                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 598                  * This ensures we cannot return from an
 599                  * FE_SET_FRONTEND ioctl before the first frontend tune
 600                  * occurs */
 601                 if (fepriv->state & FESTATE_RETUNE) {
 602                         fepriv->state = FESTATE_TUNING_FAST;
 603                 }
 604         }
 605
 606         /* slow zigzag */
 607         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 608                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 609
 610                 /* Note: don't bother checking for wrapping; we stay in this
 611                  * state until we get a lock */
 612                 dvb_frontend_swzigzag_autotune(fe, 0);
 613         }
 614 }
 615
 616 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 617 {
 618         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 619
 620         if (fe->exit != DVB_FE_NO_EXIT)
 621                 return 1;
 622
 623         if (fepriv->dvbdev->writers == 1)
 624                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 625                                   dvb_shutdown_timeout * HZ))
 626                         return 1;
 627
 628         return 0;
 629 }
 630
 631 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 632 {
 633         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 634
 635         if (fepriv->wakeup) {
 636                 fepriv->wakeup = 0;
 637                 return 1;
 638         }
 639         return dvb_frontend_is_exiting(fe);
 640 }
 641
 642 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 643 {
 644         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 645
 646         fepriv->wakeup = 1;
 647         wake_up_interruptible(&fepriv->wait_queue);
 648 }
 649
 650 static int dvb_frontend_thread(void *data)
 651 {
 652         struct dvb_frontend *fe = data;
 653         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 654         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 655         enum fe_status s = FE_NONE;
 656         enum dvbfe_algo algo;
 657         bool re_tune = false;
 658         bool semheld = false;
 659
 660         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 661
 662         fepriv->check_wrapped = 0;
 663         fepriv->quality = 0;
 664         fepriv->delay = 3 * HZ;
 665         fepriv->status = 0;
 666         fepriv->wakeup = 0;
 667         fepriv->reinitialise = 0;
 668
 669         dvb_frontend_init(fe);
 670
 671         set_freezable();
 672         while (1) {
 673                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 674 restart:
 675                 wait_event_interruptible_timeout(fepriv->wait_queue,
 676                                                  dvb_frontend_should_wakeup(fe) ||
 677                                                  kthread_should_stop() ||
 678                                                  freezing(current),
 679                         fepriv->delay);
 680
 681                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 682                         /* got signal or quitting */
 683                         if (!down_interruptible(&fepriv->sem))
 684                                 semheld = true;
 685                         fe->exit = DVB_FE_NORMAL_EXIT;
 686                         break;
 687                 }
 688
 689                 if (try_to_freeze())
 690                         goto restart;
 691
 692                 if (down_interruptible(&fepriv->sem))
 693                         break;
 694
 695                 if (fepriv->reinitialise) {
 696                         dvb_frontend_init(fe);
 697                         if (fe->ops.set_tone && fepriv->tone != -1)
 698                                 fe->ops.set_tone(fe, fepriv->tone);
 699                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 700                                 fe->ops.set_voltage(fe, fepriv->voltage);
 701                         fepriv->reinitialise = 0;
 702                 }
 703
 704                 /* do an iteration of the tuning loop */
 705                 if (fe->ops.get_frontend_algo) {
 706                         algo = fe->ops.get_frontend_algo(fe);
 707                         switch (algo) {
 708                         case DVBFE_ALGO_HW:
 709                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 710
 711                                 if (fepriv->state & FESTATE_RETUNE) {
 712                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 713                                         re_tune = true;
 714                                         fepriv->state = FESTATE_TUNED;
 715                                 } else {
 716                                         re_tune = false;
 717                                 }
 718
 719                                 if (fe->ops.tune)
 720                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 721
 722                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 723                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 724                                         dvb_frontend_add_event(fe, s);
 725                                         fepriv->status = s;
 726                                 }
 727                                 break;
 728                         case DVBFE_ALGO_SW:
 729                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 730                                 dvb_frontend_swzigzag(fe);
 731                                 break;
 732                         case DVBFE_ALGO_CUSTOM:
 733                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 734                                 if (fepriv->state & FESTATE_RETUNE) {
 735                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 736                                         fepriv->state = FESTATE_TUNED;
 737                                 }
 738                                 /* Case where we are going to search for a carrier
 739                                  * User asked us to retune again for some reason, possibly
 740                                  * requesting a search with a new set of parameters
 741                                  */
 742                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 743                                         if (fe->ops.search) {
 744                                                 fepriv->algo_status = fe->ops.search(fe);
 745                                                 /* We did do a search as was requested, the flags are
 746                                                  * now unset as well and has the flags wrt to search.
 747                                                  */
 748                                         } else {
 749                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 750                                         }
 751                                 }
 752                                 /* Track the carrier if the search was successful */
 753                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 754                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 755                                         fepriv->delay = HZ / 2;
 756                                 }
 757                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 758                                 fe->ops.read_status(fe, &s);
 759                                 if (s != fepriv->status) {
 760                                         dvb_frontend_add_event(fe, s); /* update event list */
 761                                         fepriv->status = s;
 762                                         if (!(s & FE_HAS_LOCK)) {
 763                                                 fepriv->delay = HZ / 10;
 764                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 765                                         } else {
 766                                                 fepriv->delay = 60 * HZ;
 767                                         }
 768                                 }
 769                                 break;
 770                         default:
 771                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 772                                 break;
 773                         }
 774                 } else {
 775                         dvb_frontend_swzigzag(fe);
 776                 }
 777         }
 778
 779         if (dvb_powerdown_on_sleep) {
 780                 if (fe->ops.set_voltage)
 781                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 782                 if (fe->ops.tuner_ops.sleep) {
 783                         if (fe->ops.i2c_gate_ctrl)
 784                                 fe->ops.i2c_gate_ctrl(fe, 1);
 785                         fe->ops.tuner_ops.sleep(fe);
 786                         if (fe->ops.i2c_gate_ctrl)
 787                                 fe->ops.i2c_gate_ctrl(fe, 0);
 788                 }
 789                 if (fe->ops.sleep)
 790                         fe->ops.sleep(fe);
 791         }
 792
 793         fepriv->thread = NULL;
 794         if (kthread_should_stop())
 795                 fe->exit = DVB_FE_DEVICE_REMOVED;
 796         else
 797                 fe->exit = DVB_FE_NO_EXIT;
 798         mb();
 799
 800         if (semheld)
 801                 up(&fepriv->sem);
 802         dvb_frontend_wakeup(fe);
 803         return 0;
 804 }
 805
 806 static void dvb_frontend_stop(struct dvb_frontend *fe)
 807 {
 808         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 809
 810         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 811
 812         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 813                 fe->exit = DVB_FE_NORMAL_EXIT;
 814         mb();
 815
 816         if (!fepriv->thread)
 817                 return;
 818
 819         kthread_stop(fepriv->thread);
 820
 821         sema_init(&fepriv->sem, 1);
 822         fepriv->state = FESTATE_IDLE;
 823
 824         /* paranoia check in case a signal arrived */
 825         if (fepriv->thread)
 826                 dev_warn(fe->dvb->device,
 827                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 828                          fepriv->thread);
 829 }
 830
 831 /*
 832  * Sleep for the amount of time given by add_usec parameter
 833  *
 834  * This needs to be as precise as possible, as it affects the detection of
 835  * the dish tone command at the satellite subsystem. The precision is improved
 836  * by using a scheduled msleep followed by udelay for the remainder.
 837  */
 838 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 839 {
 840         s32 delta;
 841
 842         *waketime = ktime_add_us(*waketime, add_usec);
 843         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 844         if (delta > 2500) {
 845                 msleep((delta - 1500) / 1000);
 846                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 847         }
 848         if (delta > 0)
 849                 udelay(delta);
 850 }
 851 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 852
 853 static int dvb_frontend_start(struct dvb_frontend *fe)
 854 {
 855         int ret;
 856         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 857         struct task_struct *fe_thread;
 858
 859         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 860
 861         if (fepriv->thread) {
 862                 if (fe->exit == DVB_FE_NO_EXIT)
 863                         return 0;
 864                 else
 865                         dvb_frontend_stop(fe);
 866         }
 867
 868         if (signal_pending(current))
 869                 return -EINTR;
 870         if (down_interruptible(&fepriv->sem))
 871                 return -EINTR;
 872
 873         fepriv->state = FESTATE_IDLE;
 874         fe->exit = DVB_FE_NO_EXIT;
 875         fepriv->thread = NULL;
 876         mb();
 877
 878         fe_thread = kthread_run(dvb_frontend_thread, fe,
 879                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 880         if (IS_ERR(fe_thread)) {
 881                 ret = PTR_ERR(fe_thread);
 882                 dev_warn(fe->dvb->device,
 883                          "dvb_frontend_start: failed to start kthread (%d)\n",
 884                          ret);
 885                 up(&fepriv->sem);
 886                 return ret;
 887         }
 888         fepriv->thread = fe_thread;
 889         return 0;
 890 }
 891
 892 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 893                                               u32 *freq_min, u32 *freq_max,
 894                                               u32 *tolerance)
 895 {
 896         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 897         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 898         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 899         u32 frontend_min = fe->ops.info.frequency_min_hz;
 900         u32 frontend_max = fe->ops.info.frequency_max_hz;
 901
 902         *freq_min = max(frontend_min, tuner_min);
 903
 904         if (frontend_max == 0)
 905                 *freq_max = tuner_max;
 906         else if (tuner_max == 0)
 907                 *freq_max = frontend_max;
 908         else
 909                 *freq_max = min(frontend_max, tuner_max);
 910
 911         if (*freq_min == 0 || *freq_max == 0)
 912                 dev_warn(fe->dvb->device,
 913                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 914                          fe->dvb->num, fe->id);
 915
 916         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 917                 tuner_min, tuner_max, frontend_min, frontend_max);
 918
 919         /* If the standard is for satellite, convert frequencies to kHz */
 920         switch (c->delivery_system) {
 921         case SYS_DSS:
 922         case SYS_DVBS:
 923         case SYS_DVBS2:
 924         case SYS_TURBO:
 925         case SYS_ISDBS:
 926                 *freq_min /= kHz;
 927                 *freq_max /= kHz;
 928                 if (tolerance)
 929                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 930
 931                 break;
 932         default:
 933                 if (tolerance)
 934                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 935                 break;
 936         }
 937 }
 938
 939 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 940 {
 941         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 942         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 943         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 944         u32 step = max(fe_step, tuner_step);
 945
 946         switch (c->delivery_system) {
 947         case SYS_DSS:
 948         case SYS_DVBS:
 949         case SYS_DVBS2:
 950         case SYS_TURBO:
 951         case SYS_ISDBS:
 952                 step /= kHz;
 953                 break;
 954         default:
 955                 break;
 956         }
 957
 958         return step;
 959 }
 960
 961 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 962 {
 963         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 964         u32 freq_min;
 965         u32 freq_max;
 966
 967         /* range check: frequency */
 968         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 969         if ((freq_min && c->frequency < freq_min) ||
 970             (freq_max && c->frequency > freq_max)) {
 971                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 972                          fe->dvb->num, fe->id, c->frequency,
 973                          freq_min, freq_max);
 974                 return -EINVAL;
 975         }
 976
 977         /* range check: symbol rate */
 978         switch (c->delivery_system) {
 979         case SYS_DSS:
 980         case SYS_DVBS:
 981         case SYS_DVBS2:
 982         case SYS_TURBO:
 983         case SYS_DVBC_ANNEX_A:
 984         case SYS_DVBC_ANNEX_C:
 985                 if ((fe->ops.info.symbol_rate_min &&
 986                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 987                     (fe->ops.info.symbol_rate_max &&
 988                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 989                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 990                                  fe->dvb->num, fe->id, c->symbol_rate,
 991                                  fe->ops.info.symbol_rate_min,
 992                                  fe->ops.info.symbol_rate_max);
 993                         return -EINVAL;
 994                 }
 995                 break;
 996         default:
 997                 break;
 998         }
 999
1000         return 0;
1001 }
1002
1003 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1004 {
1005         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1006         int i;
1007         u32 delsys;
1008
1009         delsys = c->delivery_system;
1010         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1011         c->delivery_system = delsys;
1012
1013         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1014                 __func__, c->delivery_system);
1015
1016         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1017         c->bandwidth_hz = 0;    /* AUTO */
1018         c->guard_interval = GUARD_INTERVAL_AUTO;
1019         c->hierarchy = HIERARCHY_AUTO;
1020         c->symbol_rate = 0;
1021         c->code_rate_HP = FEC_AUTO;
1022         c->code_rate_LP = FEC_AUTO;
1023         c->fec_inner = FEC_AUTO;
1024         c->rolloff = ROLLOFF_AUTO;
1025         c->voltage = SEC_VOLTAGE_OFF;
1026         c->sectone = SEC_TONE_OFF;
1027         c->pilot = PILOT_AUTO;
1028
1029         c->isdbt_partial_reception = 0;
1030         c->isdbt_sb_mode = 0;
1031         c->isdbt_sb_subchannel = 0;
1032         c->isdbt_sb_segment_idx = 0;
1033         c->isdbt_sb_segment_count = 0;
1034         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1035         for (i = 0; i < 3; i++) {
1036                 c->layer[i].fec = FEC_AUTO;
1037                 c->layer[i].modulation = QAM_AUTO;
1038                 c->layer[i].interleaving = 0;
1039                 c->layer[i].segment_count = 0;
1040         }
1041
1042         c->stream_id = NO_STREAM_ID_FILTER;
1043         c->scrambling_sequence_index = 0;/* default sequence */
1044
1045         switch (c->delivery_system) {
1046         case SYS_DSS:
1047                 c->modulation = QPSK;
1048                 c->rolloff = ROLLOFF_20;
1049                 break;
1050         case SYS_DVBS:
1051         case SYS_DVBS2:
1052         case SYS_TURBO:
1053                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1054                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1055                 break;
1056         case SYS_ATSC:
1057                 c->modulation = VSB_8;
1058                 break;
1059         case SYS_ISDBS:
1060                 c->symbol_rate = 28860000;
1061                 c->rolloff = ROLLOFF_35;
1062                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1063                 break;
1064         default:
1065                 c->modulation = QAM_AUTO;
1066                 break;
1067         }
1068
1069         c->lna = LNA_AUTO;
1070
1071         return 0;
1072 }
1073
1074 #define _DTV_CMD(n) \
1075         [n] =  #n
1076
1077 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1078         _DTV_CMD(DTV_TUNE),
1079         _DTV_CMD(DTV_CLEAR),
1080
1081         /* Set */
1082         _DTV_CMD(DTV_FREQUENCY),
1083         _DTV_CMD(DTV_BANDWIDTH_HZ),
1084         _DTV_CMD(DTV_MODULATION),
1085         _DTV_CMD(DTV_INVERSION),
1086         _DTV_CMD(DTV_DISEQC_MASTER),
1087         _DTV_CMD(DTV_SYMBOL_RATE),
1088         _DTV_CMD(DTV_INNER_FEC),
1089         _DTV_CMD(DTV_VOLTAGE),
1090         _DTV_CMD(DTV_TONE),
1091         _DTV_CMD(DTV_PILOT),
1092         _DTV_CMD(DTV_ROLLOFF),
1093         _DTV_CMD(DTV_DELIVERY_SYSTEM),
1094         _DTV_CMD(DTV_HIERARCHY),
1095         _DTV_CMD(DTV_CODE_RATE_HP),
1096         _DTV_CMD(DTV_CODE_RATE_LP),
1097         _DTV_CMD(DTV_GUARD_INTERVAL),
1098         _DTV_CMD(DTV_TRANSMISSION_MODE),
1099         _DTV_CMD(DTV_INTERLEAVING),
1100
1101         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1102         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1103         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1104         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1105         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1106         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1107         _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1108         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1109         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1110         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1111         _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1112         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1113         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1114         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1115         _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1116         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1117         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1118         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1119
1120         _DTV_CMD(DTV_STREAM_ID),
1121         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1122         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1123         _DTV_CMD(DTV_LNA),
1124
1125         /* Get */
1126         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1127         _DTV_CMD(DTV_API_VERSION),
1128
1129         _DTV_CMD(DTV_ENUM_DELSYS),
1130
1131         _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1132         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1133
1134         _DTV_CMD(DTV_ATSCMH_FIC_VER),
1135         _DTV_CMD(DTV_ATSCMH_NOG),
1136         _DTV_CMD(DTV_ATSCMH_TNOG),
1137         _DTV_CMD(DTV_ATSCMH_SGN),
1138         _DTV_CMD(DTV_ATSCMH_PRC),
1139         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1140         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1141         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1142         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1143         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1144         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1145         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1146         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1147
1148         /* Statistics API */
1149         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1150         _DTV_CMD(DTV_STAT_CNR),
1151         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1152         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1153         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1154         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1155         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1156         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1157 };
1158
1159 static char *dtv_cmd_name(u32 cmd)
1160 {
1161         cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1162         return dtv_cmds[cmd];
1163 }
1164
1165 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1166  * drivers can use a single set_frontend tuning function, regardless of whether
1167  * it's being used for the legacy or new API, reducing code and complexity.
1168  */
1169 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1170                                    struct dtv_frontend_properties *c,
1171                                    const struct dvb_frontend_parameters *p)
1172 {
1173         c->frequency = p->frequency;
1174         c->inversion = p->inversion;
1175
1176         switch (dvbv3_type(c->delivery_system)) {
1177         case DVBV3_QPSK:
1178                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1179                 c->symbol_rate = p->u.qpsk.symbol_rate;
1180                 c->fec_inner = p->u.qpsk.fec_inner;
1181                 break;
1182         case DVBV3_QAM:
1183                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1184                 c->symbol_rate = p->u.qam.symbol_rate;
1185                 c->fec_inner = p->u.qam.fec_inner;
1186                 c->modulation = p->u.qam.modulation;
1187                 break;
1188         case DVBV3_OFDM:
1189                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1190
1191                 switch (p->u.ofdm.bandwidth) {
1192                 case BANDWIDTH_10_MHZ:
1193                         c->bandwidth_hz = 10000000;
1194                         break;
1195                 case BANDWIDTH_8_MHZ:
1196                         c->bandwidth_hz = 8000000;
1197                         break;
1198                 case BANDWIDTH_7_MHZ:
1199                         c->bandwidth_hz = 7000000;
1200                         break;
1201                 case BANDWIDTH_6_MHZ:
1202                         c->bandwidth_hz = 6000000;
1203                         break;
1204                 case BANDWIDTH_5_MHZ:
1205                         c->bandwidth_hz = 5000000;
1206                         break;
1207                 case BANDWIDTH_1_712_MHZ:
1208                         c->bandwidth_hz = 1712000;
1209                         break;
1210                 case BANDWIDTH_AUTO:
1211                         c->bandwidth_hz = 0;
1212                 }
1213
1214                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1215                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1216                 c->modulation = p->u.ofdm.constellation;
1217                 c->transmission_mode = p->u.ofdm.transmission_mode;
1218                 c->guard_interval = p->u.ofdm.guard_interval;
1219                 c->hierarchy = p->u.ofdm.hierarchy_information;
1220                 break;
1221         case DVBV3_ATSC:
1222                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1223                 c->modulation = p->u.vsb.modulation;
1224                 if (c->delivery_system == SYS_ATSCMH)
1225                         break;
1226                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1227                         c->delivery_system = SYS_ATSC;
1228                 else
1229                         c->delivery_system = SYS_DVBC_ANNEX_B;
1230                 break;
1231         case DVBV3_UNKNOWN:
1232                 dev_err(fe->dvb->device,
1233                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1234                         __func__, c->delivery_system);
1235                 return -EINVAL;
1236         }
1237
1238         return 0;
1239 }
1240
1241 /* Ensure the cached values are set correctly in the frontend
1242  * legacy tuning structures, for the advanced tuning API.
1243  */
1244 static int
1245 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1246                                 const struct dtv_frontend_properties *c,
1247                                 struct dvb_frontend_parameters *p)
1248 {
1249         p->frequency = c->frequency;
1250         p->inversion = c->inversion;
1251
1252         switch (dvbv3_type(c->delivery_system)) {
1253         case DVBV3_UNKNOWN:
1254                 dev_err(fe->dvb->device,
1255                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1256                         __func__, c->delivery_system);
1257                 return -EINVAL;
1258         case DVBV3_QPSK:
1259                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1260                 p->u.qpsk.symbol_rate = c->symbol_rate;
1261                 p->u.qpsk.fec_inner = c->fec_inner;
1262                 break;
1263         case DVBV3_QAM:
1264                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1265                 p->u.qam.symbol_rate = c->symbol_rate;
1266                 p->u.qam.fec_inner = c->fec_inner;
1267                 p->u.qam.modulation = c->modulation;
1268                 break;
1269         case DVBV3_OFDM:
1270                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1271                 switch (c->bandwidth_hz) {
1272                 case 10000000:
1273                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1274                         break;
1275                 case 8000000:
1276                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1277                         break;
1278                 case 7000000:
1279                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1280                         break;
1281                 case 6000000:
1282                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1283                         break;
1284                 case 5000000:
1285                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1286                         break;
1287                 case 1712000:
1288                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1289                         break;
1290                 case 0:
1291                 default:
1292                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1293                 }
1294                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1295                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1296                 p->u.ofdm.constellation = c->modulation;
1297                 p->u.ofdm.transmission_mode = c->transmission_mode;
1298                 p->u.ofdm.guard_interval = c->guard_interval;
1299                 p->u.ofdm.hierarchy_information = c->hierarchy;
1300                 break;
1301         case DVBV3_ATSC:
1302                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1303                 p->u.vsb.modulation = c->modulation;
1304                 break;
1305         }
1306         return 0;
1307 }
1308
1309 /**
1310  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1311  * @fe:         struct dvb_frontend pointer
1312  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1313  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1314  *
1315  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1316  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1317  * If p_out is not null, it will update the DVBv3 params pointed by it.
1318  */
1319 static int dtv_get_frontend(struct dvb_frontend *fe,
1320                             struct dtv_frontend_properties *c,
1321                             struct dvb_frontend_parameters *p_out)
1322 {
1323         int r;
1324
1325         if (fe->ops.get_frontend) {
1326                 r = fe->ops.get_frontend(fe, c);
1327                 if (unlikely(r < 0))
1328                         return r;
1329                 if (p_out)
1330                         dtv_property_legacy_params_sync(fe, c, p_out);
1331                 return 0;
1332         }
1333
1334         /* As everything is in cache, get_frontend fops are always supported */
1335         return 0;
1336 }
1337
1338 static int dvb_frontend_handle_ioctl(struct file *file,
1339                                      unsigned int cmd, void *parg);
1340
1341 static int dtv_property_process_get(struct dvb_frontend *fe,
1342                                     const struct dtv_frontend_properties *c,
1343                                     struct dtv_property *tvp,
1344                                     struct file *file)
1345 {
1346         int ncaps;
1347         unsigned int len = 1;
1348
1349         switch (tvp->cmd) {
1350         case DTV_ENUM_DELSYS:
1351                 ncaps = 0;
1352                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1353                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1354                         ncaps++;
1355                 }
1356                 tvp->u.buffer.len = ncaps;
1357                 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                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1536                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1537                 len = tvp->u.buffer.len;
1538                 break;
1539         case DTV_STAT_CNR:
1540                 tvp->u.st = c->cnr;
1541                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1542                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1543                 len = tvp->u.buffer.len;
1544                 break;
1545         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1546                 tvp->u.st = c->pre_bit_error;
1547                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1548                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1549                 len = tvp->u.buffer.len;
1550                 break;
1551         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1552                 tvp->u.st = c->pre_bit_count;
1553                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1554                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1555                 len = tvp->u.buffer.len;
1556                 break;
1557         case DTV_STAT_POST_ERROR_BIT_COUNT:
1558                 tvp->u.st = c->post_bit_error;
1559                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1560                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1561                 len = tvp->u.buffer.len;
1562                 break;
1563         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1564                 tvp->u.st = c->post_bit_count;
1565                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1566                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1567                 len = tvp->u.buffer.len;
1568                 break;
1569         case DTV_STAT_ERROR_BLOCK_COUNT:
1570                 tvp->u.st = c->block_error;
1571                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1572                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1573                 len = tvp->u.buffer.len;
1574                 break;
1575         case DTV_STAT_TOTAL_BLOCK_COUNT:
1576                 tvp->u.st = c->block_count;
1577                 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1578                         tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1579                 len = tvp->u.buffer.len;
1580                 break;
1581         default:
1582                 dev_dbg(fe->dvb->device,
1583                         "%s: FE property %d doesn't exist\n",
1584                         __func__, tvp->cmd);
1585                 return -EINVAL;
1586         }
1587
1588         if (len < 1)
1589                 len = 1;
1590
1591         dev_dbg(fe->dvb->device,
1592                 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1593                 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1594                 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1595
1596         return 0;
1597 }
1598
1599 static int dtv_set_frontend(struct dvb_frontend *fe);
1600
1601 static bool is_dvbv3_delsys(u32 delsys)
1602 {
1603         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1604                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1605 }
1606
1607 /**
1608  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1609  * @fe:                 struct frontend;
1610  * @delsys:                     DVBv5 type that will be used for emulation
1611  *
1612  * Provides emulation for delivery systems that are compatible with the old
1613  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1614  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1615  * parameters are compatible with DVB-S spec.
1616  */
1617 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1618 {
1619         int i;
1620         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1621
1622         c->delivery_system = delsys;
1623
1624         /*
1625          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1626          */
1627         if (c->delivery_system == SYS_ISDBT) {
1628                 dev_dbg(fe->dvb->device,
1629                         "%s: Using defaults for SYS_ISDBT\n",
1630                         __func__);
1631
1632                 if (!c->bandwidth_hz)
1633                         c->bandwidth_hz = 6000000;
1634
1635                 c->isdbt_partial_reception = 0;
1636                 c->isdbt_sb_mode = 0;
1637                 c->isdbt_sb_subchannel = 0;
1638                 c->isdbt_sb_segment_idx = 0;
1639                 c->isdbt_sb_segment_count = 0;
1640                 c->isdbt_layer_enabled = 7;
1641                 for (i = 0; i < 3; i++) {
1642                         c->layer[i].fec = FEC_AUTO;
1643                         c->layer[i].modulation = QAM_AUTO;
1644                         c->layer[i].interleaving = 0;
1645                         c->layer[i].segment_count = 0;
1646                 }
1647         }
1648         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1649                 __func__, c->delivery_system);
1650
1651         return 0;
1652 }
1653
1654 /**
1655  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1656  * @fe:                 frontend struct
1657  * @desired_system:     delivery system requested by the user
1658  *
1659  * A DVBv5 call know what's the desired system it wants. So, set it.
1660  *
1661  * There are, however, a few known issues with early DVBv5 applications that
1662  * are also handled by this logic:
1663  *
1664  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1665  *    This is an API violation, but, as we don't want to break userspace,
1666  *    convert it to the first supported delivery system.
1667  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1668  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1669  *    ISDB-T provided backward compat with DVB-T.
1670  */
1671 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1672                                      u32 desired_system)
1673 {
1674         int ncaps;
1675         u32 delsys = SYS_UNDEFINED;
1676         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1677         enum dvbv3_emulation_type type;
1678
1679         /*
1680          * It was reported that some old DVBv5 applications were
1681          * filling delivery_system with SYS_UNDEFINED. If this happens,
1682          * assume that the application wants to use the first supported
1683          * delivery system.
1684          */
1685         if (desired_system == SYS_UNDEFINED)
1686                 desired_system = fe->ops.delsys[0];
1687
1688         /*
1689          * This is a DVBv5 call. So, it likely knows the supported
1690          * delivery systems. So, check if the desired delivery system is
1691          * supported
1692          */
1693         ncaps = 0;
1694         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1695                 if (fe->ops.delsys[ncaps] == desired_system) {
1696                         c->delivery_system = desired_system;
1697                         dev_dbg(fe->dvb->device,
1698                                 "%s: Changing delivery system to %d\n",
1699                                 __func__, desired_system);
1700                         return 0;
1701                 }
1702                 ncaps++;
1703         }
1704
1705         /*
1706          * The requested delivery system isn't supported. Maybe userspace
1707          * is requesting a DVBv3 compatible delivery system.
1708          *
1709          * The emulation only works if the desired system is one of the
1710          * delivery systems supported by DVBv3 API
1711          */
1712         if (!is_dvbv3_delsys(desired_system)) {
1713                 dev_dbg(fe->dvb->device,
1714                         "%s: Delivery system %d not supported.\n",
1715                         __func__, desired_system);
1716                 return -EINVAL;
1717         }
1718
1719         type = dvbv3_type(desired_system);
1720
1721         /*
1722         * Get the last non-DVBv3 delivery system that has the same type
1723         * of the desired system
1724         */
1725         ncaps = 0;
1726         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1727                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1728                         delsys = fe->ops.delsys[ncaps];
1729                 ncaps++;
1730         }
1731
1732         /* There's nothing compatible with the desired delivery system */
1733         if (delsys == SYS_UNDEFINED) {
1734                 dev_dbg(fe->dvb->device,
1735                         "%s: Delivery system %d not supported on emulation mode.\n",
1736                         __func__, desired_system);
1737                 return -EINVAL;
1738         }
1739
1740         dev_dbg(fe->dvb->device,
1741                 "%s: Using delivery system %d emulated as if it were %d\n",
1742                 __func__, delsys, desired_system);
1743
1744         return emulate_delivery_system(fe, desired_system);
1745 }
1746
1747 /**
1748  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1749  * @fe: frontend struct
1750  *
1751  * A DVBv3 call doesn't know what's the desired system it wants. It also
1752  * doesn't allow to switch between different types. Due to that, userspace
1753  * should use DVBv5 instead.
1754  * However, in order to avoid breaking userspace API, limited backward
1755  * compatibility support is provided.
1756  *
1757  * There are some delivery systems that are incompatible with DVBv3 calls.
1758  *
1759  * This routine should work fine for frontends that support just one delivery
1760  * system.
1761  *
1762  * For frontends that support multiple frontends:
1763  * 1) It defaults to use the first supported delivery system. There's an
1764  *    userspace application that allows changing it at runtime;
1765  *
1766  * 2) If the current delivery system is not compatible with DVBv3, it gets
1767  *    the first one that it is compatible.
1768  *
1769  * NOTE: in order for this to work with applications like Kaffeine that
1770  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1771  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1772  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1773  *      to DVB-S.
1774  */
1775 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1776 {
1777         int ncaps;
1778         u32 delsys = SYS_UNDEFINED;
1779         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1780
1781         /* If not set yet, defaults to the first supported delivery system */
1782         if (c->delivery_system == SYS_UNDEFINED)
1783                 c->delivery_system = fe->ops.delsys[0];
1784
1785         /*
1786          * Trivial case: just use the current one, if it already a DVBv3
1787          * delivery system
1788          */
1789         if (is_dvbv3_delsys(c->delivery_system)) {
1790                 dev_dbg(fe->dvb->device,
1791                         "%s: Using delivery system to %d\n",
1792                         __func__, c->delivery_system);
1793                 return 0;
1794         }
1795
1796         /*
1797          * Seek for the first delivery system that it is compatible with a
1798          * DVBv3 standard
1799          */
1800         ncaps = 0;
1801         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1802                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1803                         delsys = fe->ops.delsys[ncaps];
1804                         break;
1805                 }
1806                 ncaps++;
1807         }
1808         if (delsys == SYS_UNDEFINED) {
1809                 dev_dbg(fe->dvb->device,
1810                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1811                         __func__);
1812                 return -EINVAL;
1813         }
1814         return emulate_delivery_system(fe, delsys);
1815 }
1816
1817 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1818 {
1819         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1820         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1821         struct dvb_frontend_tune_settings fetunesettings = { 0 };
1822
1823         /* get frontend-specific tuning settings */
1824         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1825                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1826                 fepriv->max_drift = fetunesettings.max_drift;
1827                 fepriv->step_size = fetunesettings.step_size;
1828         } else {
1829                 /* default values */
1830                 switch (c->delivery_system) {
1831                 case SYS_DSS:
1832                 case SYS_DVBS:
1833                 case SYS_DVBS2:
1834                 case SYS_ISDBS:
1835                 case SYS_TURBO:
1836                 case SYS_DVBC_ANNEX_A:
1837                 case SYS_DVBC_ANNEX_C:
1838                         fepriv->min_delay = HZ / 20;
1839                         fepriv->step_size = c->symbol_rate / 16000;
1840                         fepriv->max_drift = c->symbol_rate / 2000;
1841                         break;
1842                 case SYS_DVBT:
1843                 case SYS_DVBT2:
1844                 case SYS_ISDBT:
1845                 case SYS_DTMB:
1846                         fepriv->min_delay = HZ / 20;
1847                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1848                         fepriv->max_drift = fepriv->step_size + 1;
1849                         break;
1850                 default:
1851                         /*
1852                          * FIXME: This sounds wrong! if freqency_stepsize is
1853                          * defined by the frontend, why not use it???
1854                          */
1855                         fepriv->min_delay = HZ / 20;
1856                         fepriv->step_size = 0; /* no zigzag */
1857                         fepriv->max_drift = 0;
1858                         break;
1859                 }
1860         }
1861         if (dvb_override_tune_delay > 0)
1862                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1863 }
1864
1865 /**
1866  * dtv_property_process_set -  Sets a single DTV property
1867  * @fe:         Pointer to &struct dvb_frontend
1868  * @file:       Pointer to &struct file
1869  * @cmd:        Digital TV command
1870  * @data:       An unsigned 32-bits number
1871  *
1872  * This routine assigns the property
1873  * value to the corresponding member of
1874  * &struct dtv_frontend_properties
1875  *
1876  * Returns:
1877  * Zero on success, negative errno on failure.
1878  */
1879 static int dtv_property_process_set(struct dvb_frontend *fe,
1880                                     struct file *file,
1881                                     u32 cmd, u32 data)
1882 {
1883         int r = 0;
1884         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1885
1886         /** Dump DTV command name and value*/
1887         if (!cmd || cmd > DTV_MAX_COMMAND)
1888                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1889                          __func__, cmd);
1890         else
1891                 dev_dbg(fe->dvb->device,
1892                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1893                         __func__, cmd, dtv_cmd_name(cmd), data);
1894         switch (cmd) {
1895         case DTV_CLEAR:
1896                 /*
1897                  * Reset a cache of data specific to the frontend here. This does
1898                  * not effect hardware.
1899                  */
1900                 dvb_frontend_clear_cache(fe);
1901                 break;
1902         case DTV_TUNE:
1903                 /*
1904                  * Use the cached Digital TV properties to tune the
1905                  * frontend
1906                  */
1907                 dev_dbg(fe->dvb->device,
1908                         "%s: Setting the frontend from property cache\n",
1909                         __func__);
1910
1911                 r = dtv_set_frontend(fe);
1912                 break;
1913         case DTV_FREQUENCY:
1914                 c->frequency = data;
1915                 break;
1916         case DTV_MODULATION:
1917                 c->modulation = data;
1918                 break;
1919         case DTV_BANDWIDTH_HZ:
1920                 c->bandwidth_hz = data;
1921                 break;
1922         case DTV_INVERSION:
1923                 c->inversion = data;
1924                 break;
1925         case DTV_SYMBOL_RATE:
1926                 c->symbol_rate = data;
1927                 break;
1928         case DTV_INNER_FEC:
1929                 c->fec_inner = data;
1930                 break;
1931         case DTV_PILOT:
1932                 c->pilot = data;
1933                 break;
1934         case DTV_ROLLOFF:
1935                 c->rolloff = data;
1936                 break;
1937         case DTV_DELIVERY_SYSTEM:
1938                 r = dvbv5_set_delivery_system(fe, data);
1939                 break;
1940         case DTV_VOLTAGE:
1941                 c->voltage = data;
1942                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1943                                               (void *)c->voltage);
1944                 break;
1945         case DTV_TONE:
1946                 c->sectone = data;
1947                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1948                                               (void *)c->sectone);
1949                 break;
1950         case DTV_CODE_RATE_HP:
1951                 c->code_rate_HP = data;
1952                 break;
1953         case DTV_CODE_RATE_LP:
1954                 c->code_rate_LP = data;
1955                 break;
1956         case DTV_GUARD_INTERVAL:
1957                 c->guard_interval = data;
1958                 break;
1959         case DTV_TRANSMISSION_MODE:
1960                 c->transmission_mode = data;
1961                 break;
1962         case DTV_HIERARCHY:
1963                 c->hierarchy = data;
1964                 break;
1965         case DTV_INTERLEAVING:
1966                 c->interleaving = data;
1967                 break;
1968
1969         /* ISDB-T Support here */
1970         case DTV_ISDBT_PARTIAL_RECEPTION:
1971                 c->isdbt_partial_reception = data;
1972                 break;
1973         case DTV_ISDBT_SOUND_BROADCASTING:
1974                 c->isdbt_sb_mode = data;
1975                 break;
1976         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1977                 c->isdbt_sb_subchannel = data;
1978                 break;
1979         case DTV_ISDBT_SB_SEGMENT_IDX:
1980                 c->isdbt_sb_segment_idx = data;
1981                 break;
1982         case DTV_ISDBT_SB_SEGMENT_COUNT:
1983                 c->isdbt_sb_segment_count = data;
1984                 break;
1985         case DTV_ISDBT_LAYER_ENABLED:
1986                 c->isdbt_layer_enabled = data;
1987                 break;
1988         case DTV_ISDBT_LAYERA_FEC:
1989                 c->layer[0].fec = data;
1990                 break;
1991         case DTV_ISDBT_LAYERA_MODULATION:
1992                 c->layer[0].modulation = data;
1993                 break;
1994         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1995                 c->layer[0].segment_count = data;
1996                 break;
1997         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1998                 c->layer[0].interleaving = data;
1999                 break;
2000         case DTV_ISDBT_LAYERB_FEC:
2001                 c->layer[1].fec = data;
2002                 break;
2003         case DTV_ISDBT_LAYERB_MODULATION:
2004                 c->layer[1].modulation = data;
2005                 break;
2006         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2007                 c->layer[1].segment_count = data;
2008                 break;
2009         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2010                 c->layer[1].interleaving = data;
2011                 break;
2012         case DTV_ISDBT_LAYERC_FEC:
2013                 c->layer[2].fec = data;
2014                 break;
2015         case DTV_ISDBT_LAYERC_MODULATION:
2016                 c->layer[2].modulation = data;
2017                 break;
2018         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2019                 c->layer[2].segment_count = data;
2020                 break;
2021         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2022                 c->layer[2].interleaving = data;
2023                 break;
2024
2025         /* Multistream support */
2026         case DTV_STREAM_ID:
2027         case DTV_DVBT2_PLP_ID_LEGACY:
2028                 c->stream_id = data;
2029                 break;
2030
2031         /* Physical layer scrambling support */
2032         case DTV_SCRAMBLING_SEQUENCE_INDEX:
2033                 c->scrambling_sequence_index = data;
2034                 break;
2035
2036         /* ATSC-MH */
2037         case DTV_ATSCMH_PARADE_ID:
2038                 fe->dtv_property_cache.atscmh_parade_id = data;
2039                 break;
2040         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2041                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2042                 break;
2043
2044         case DTV_LNA:
2045                 c->lna = data;
2046                 if (fe->ops.set_lna)
2047                         r = fe->ops.set_lna(fe);
2048                 if (r < 0)
2049                         c->lna = LNA_AUTO;
2050                 break;
2051
2052         default:
2053                 return -EINVAL;
2054         }
2055
2056         return r;
2057 }
2058
2059 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2060                                  void *parg)
2061 {
2062         struct dvb_device *dvbdev = file->private_data;
2063         struct dvb_frontend *fe = dvbdev->priv;
2064         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2065         int err;
2066
2067         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2068         if (down_interruptible(&fepriv->sem))
2069                 return -ERESTARTSYS;
2070
2071         if (fe->exit != DVB_FE_NO_EXIT) {
2072                 up(&fepriv->sem);
2073                 return -ENODEV;
2074         }
2075
2076         /*
2077          * If the frontend is opened in read-only mode, only the ioctls
2078          * that don't interfere with the tune logic should be accepted.
2079          * That allows an external application to monitor the DVB QoS and
2080          * statistics parameters.
2081          *
2082          * That matches all _IOR() ioctls, except for two special cases:
2083          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2084          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2085          *     setup
2086          * So, those two ioctls should also return -EPERM, as otherwise
2087          * reading from them would interfere with a DVB tune application
2088          */
2089         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2090             && (_IOC_DIR(cmd) != _IOC_READ
2091                 || cmd == FE_GET_EVENT
2092                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2093                 up(&fepriv->sem);
2094                 return -EPERM;
2095         }
2096
2097         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2098
2099         up(&fepriv->sem);
2100         return err;
2101 }
2102
2103 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2104                                unsigned long arg)
2105 {
2106         struct dvb_device *dvbdev = file->private_data;
2107
2108         if (!dvbdev)
2109                 return -ENODEV;
2110
2111         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2112 }
2113
2114 #ifdef CONFIG_COMPAT
2115 struct compat_dtv_property {
2116         __u32 cmd;
2117         __u32 reserved[3];
2118         union {
2119                 __u32 data;
2120                 struct dtv_fe_stats st;
2121                 struct {
2122                         __u8 data[32];
2123                         __u32 len;
2124                         __u32 reserved1[3];
2125                         compat_uptr_t reserved2;
2126                 } buffer;
2127         } u;
2128         int result;
2129 } __attribute__ ((packed));
2130
2131 struct compat_dtv_properties {
2132         __u32 num;
2133         compat_uptr_t props;
2134 };
2135
2136 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2137 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2138
2139 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2140                                             unsigned long arg)
2141 {
2142         struct dvb_device *dvbdev = file->private_data;
2143         struct dvb_frontend *fe = dvbdev->priv;
2144         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2145         int i, err = 0;
2146
2147         if (cmd == COMPAT_FE_SET_PROPERTY) {
2148                 struct compat_dtv_properties prop, *tvps = NULL;
2149                 struct compat_dtv_property *tvp = NULL;
2150
2151                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2152                         return -EFAULT;
2153
2154                 tvps = &prop;
2155
2156                 /*
2157                  * Put an arbitrary limit on the number of messages that can
2158                  * be sent at once
2159                  */
2160                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2161                         return -EINVAL;
2162
2163                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2164                 if (IS_ERR(tvp))
2165                         return PTR_ERR(tvp);
2166
2167                 for (i = 0; i < tvps->num; i++) {
2168                         err = dtv_property_process_set(fe, file,
2169                                                        (tvp + i)->cmd,
2170                                                        (tvp + i)->u.data);
2171                         if (err < 0) {
2172                                 kfree(tvp);
2173                                 return err;
2174                         }
2175                 }
2176                 kfree(tvp);
2177         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2178                 struct compat_dtv_properties prop, *tvps = NULL;
2179                 struct compat_dtv_property *tvp = NULL;
2180                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2181
2182                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2183                         return -EFAULT;
2184
2185                 tvps = &prop;
2186
2187                 /*
2188                  * Put an arbitrary limit on the number of messages that can
2189                  * be sent at once
2190                  */
2191                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2192                         return -EINVAL;
2193
2194                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2195                 if (IS_ERR(tvp))
2196                         return PTR_ERR(tvp);
2197
2198                 /*
2199                  * Let's use our own copy of property cache, in order to
2200                  * avoid mangling with DTV zigzag logic, as drivers might
2201                  * return crap, if they don't check if the data is available
2202                  * before updating the properties cache.
2203                  */
2204                 if (fepriv->state != FESTATE_IDLE) {
2205                         err = dtv_get_frontend(fe, &getp, NULL);
2206                         if (err < 0) {
2207                                 kfree(tvp);
2208                                 return err;
2209                         }
2210                 }
2211                 for (i = 0; i < tvps->num; i++) {
2212                         err = dtv_property_process_get(
2213                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2214                         if (err < 0) {
2215                                 kfree(tvp);
2216                                 return err;
2217                         }
2218                 }
2219
2220                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2221                                  tvps->num * sizeof(struct compat_dtv_property))) {
2222                         kfree(tvp);
2223                         return -EFAULT;
2224                 }
2225                 kfree(tvp);
2226         }
2227
2228         return err;
2229 }
2230
2231 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2232                                       unsigned long arg)
2233 {
2234         struct dvb_device *dvbdev = file->private_data;
2235         struct dvb_frontend *fe = dvbdev->priv;
2236         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2237         int err;
2238
2239         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2240                 if (down_interruptible(&fepriv->sem))
2241                         return -ERESTARTSYS;
2242
2243                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2244
2245                 up(&fepriv->sem);
2246                 return err;
2247         }
2248
2249         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2250 }
2251 #endif
2252
2253 static int dtv_set_frontend(struct dvb_frontend *fe)
2254 {
2255         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2256         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2257         u32 rolloff = 0;
2258
2259         if (dvb_frontend_check_parameters(fe) < 0)
2260                 return -EINVAL;
2261
2262         /*
2263          * Initialize output parameters to match the values given by
2264          * the user. FE_SET_FRONTEND triggers an initial frontend event
2265          * with status = 0, which copies output parameters to userspace.
2266          */
2267         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2268
2269         /*
2270          * Be sure that the bandwidth will be filled for all
2271          * non-satellite systems, as tuners need to know what
2272          * low pass/Nyquist half filter should be applied, in
2273          * order to avoid inter-channel noise.
2274          *
2275          * ISDB-T and DVB-T/T2 already sets bandwidth.
2276          * ATSC and DVB-C don't set, so, the core should fill it.
2277          *
2278          * On DVB-C Annex A and C, the bandwidth is a function of
2279          * the roll-off and symbol rate. Annex B defines different
2280          * roll-off factors depending on the modulation. Fortunately,
2281          * Annex B is only used with 6MHz, so there's no need to
2282          * calculate it.
2283          *
2284          * While not officially supported, a side effect of handling it at
2285          * the cache level is that a program could retrieve the bandwidth
2286          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2287          */
2288         switch (c->delivery_system) {
2289         case SYS_ATSC:
2290         case SYS_DVBC_ANNEX_B:
2291                 c->bandwidth_hz = 6000000;
2292                 break;
2293         case SYS_DVBC_ANNEX_A:
2294                 rolloff = 115;
2295                 break;
2296         case SYS_DVBC_ANNEX_C:
2297                 rolloff = 113;
2298                 break;
2299         case SYS_DSS:
2300                 rolloff = 120;
2301                 break;
2302         case SYS_DVBS:
2303         case SYS_TURBO:
2304         case SYS_ISDBS:
2305                 rolloff = 135;
2306                 break;
2307         case SYS_DVBS2:
2308                 switch (c->rolloff) {
2309                 case ROLLOFF_20:
2310                         rolloff = 120;
2311                         break;
2312                 case ROLLOFF_25:
2313                         rolloff = 125;
2314                         break;
2315                 default:
2316                 case ROLLOFF_35:
2317                         rolloff = 135;
2318                 }
2319                 break;
2320         default:
2321                 break;
2322         }
2323         if (rolloff)
2324                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2325
2326         /* force auto frequency inversion if requested */
2327         if (dvb_force_auto_inversion)
2328                 c->inversion = INVERSION_AUTO;
2329
2330         /*
2331          * without hierarchical coding code_rate_LP is irrelevant,
2332          * so we tolerate the otherwise invalid FEC_NONE setting
2333          */
2334         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2335                 c->code_rate_LP = FEC_AUTO;
2336
2337         prepare_tuning_algo_parameters(fe);
2338
2339         fepriv->state = FESTATE_RETUNE;
2340
2341         /* Request the search algorithm to search */
2342         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2343
2344         dvb_frontend_clear_events(fe);
2345         dvb_frontend_add_event(fe, 0);
2346         dvb_frontend_wakeup(fe);
2347         fepriv->status = 0;
2348
2349         return 0;
2350 }
2351
2352 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2353                             struct dtv_properties *tvps)
2354 {
2355         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2356         struct dtv_property *tvp = NULL;
2357         struct dtv_frontend_properties getp;
2358         int i, err;
2359
2360         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2361
2362         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2363                 __func__, tvps->num);
2364         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2365                 __func__, tvps->props);
2366
2367         /*
2368          * Put an arbitrary limit on the number of messages that can
2369          * be sent at once
2370          */
2371         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2372                 return -EINVAL;
2373
2374         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2375         if (IS_ERR(tvp))
2376                 return PTR_ERR(tvp);
2377
2378         /*
2379          * Let's use our own copy of property cache, in order to
2380          * avoid mangling with DTV zigzag logic, as drivers might
2381          * return crap, if they don't check if the data is available
2382          * before updating the properties cache.
2383          */
2384         if (fepriv->state != FESTATE_IDLE) {
2385                 err = dtv_get_frontend(fe, &getp, NULL);
2386                 if (err < 0)
2387                         goto out;
2388         }
2389         for (i = 0; i < tvps->num; i++) {
2390                 err = dtv_property_process_get(fe, &getp,
2391                                                tvp + i, file);
2392                 if (err < 0)
2393                         goto out;
2394         }
2395
2396         if (copy_to_user((void __user *)tvps->props, tvp,
2397                          tvps->num * sizeof(struct dtv_property))) {
2398                 err = -EFAULT;
2399                 goto out;
2400         }
2401
2402         err = 0;
2403 out:
2404         kfree(tvp);
2405         return err;
2406 }
2407
2408 static int dvb_get_frontend(struct dvb_frontend *fe,
2409                             struct dvb_frontend_parameters *p_out)
2410 {
2411         struct dtv_frontend_properties getp;
2412
2413         /*
2414          * Let's use our own copy of property cache, in order to
2415          * avoid mangling with DTV zigzag logic, as drivers might
2416          * return crap, if they don't check if the data is available
2417          * before updating the properties cache.
2418          */
2419         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2420
2421         return dtv_get_frontend(fe, &getp, p_out);
2422 }
2423
2424 static int dvb_frontend_handle_ioctl(struct file *file,
2425                                      unsigned int cmd, void *parg)
2426 {
2427         struct dvb_device *dvbdev = file->private_data;
2428         struct dvb_frontend *fe = dvbdev->priv;
2429         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2430         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2431         int i, err = -ENOTSUPP;
2432
2433         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2434
2435         switch (cmd) {
2436         case FE_SET_PROPERTY: {
2437                 struct dtv_properties *tvps = parg;
2438                 struct dtv_property *tvp = NULL;
2439
2440                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2441                         __func__, tvps->num);
2442                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2443                         __func__, tvps->props);
2444
2445                 /*
2446                  * Put an arbitrary limit on the number of messages that can
2447                  * be sent at once
2448                  */
2449                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2450                         return -EINVAL;
2451
2452                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2453                 if (IS_ERR(tvp))
2454                         return PTR_ERR(tvp);
2455
2456                 for (i = 0; i < tvps->num; i++) {
2457                         err = dtv_property_process_set(fe, file,
2458                                                        (tvp + i)->cmd,
2459                                                        (tvp + i)->u.data);
2460                         if (err < 0) {
2461                                 kfree(tvp);
2462                                 return err;
2463                         }
2464                 }
2465                 kfree(tvp);
2466                 err = 0;
2467                 break;
2468         }
2469         case FE_GET_PROPERTY:
2470                 err = dvb_get_property(fe, file, parg);
2471                 break;
2472
2473         case FE_GET_INFO: {
2474                 struct dvb_frontend_info *info = parg;
2475                 memset(info, 0, sizeof(*info));
2476
2477                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2478                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2479                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2480                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2481                 info->caps = fe->ops.info.caps;
2482                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2483                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2484                                                   &info->frequency_max,
2485                                                   &info->frequency_tolerance);
2486
2487                 /*
2488                  * Associate the 4 delivery systems supported by DVBv3
2489                  * API with their DVBv5 counterpart. For the other standards,
2490                  * use the closest type, assuming that it would hopefully
2491                  * work with a DVBv3 application.
2492                  * It should be noticed that, on multi-frontend devices with
2493                  * different types (terrestrial and cable, for example),
2494                  * a pure DVBv3 application won't be able to use all delivery
2495                  * systems. Yet, changing the DVBv5 cache to the other delivery
2496                  * system should be enough for making it work.
2497                  */
2498                 switch (dvbv3_type(c->delivery_system)) {
2499                 case DVBV3_QPSK:
2500                         info->type = FE_QPSK;
2501                         break;
2502                 case DVBV3_ATSC:
2503                         info->type = FE_ATSC;
2504                         break;
2505                 case DVBV3_QAM:
2506                         info->type = FE_QAM;
2507                         break;
2508                 case DVBV3_OFDM:
2509                         info->type = FE_OFDM;
2510                         break;
2511                 default:
2512                         dev_err(fe->dvb->device,
2513                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2514                                 __func__, c->delivery_system);
2515                         info->type = FE_OFDM;
2516                 }
2517                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2518                         __func__, c->delivery_system, info->type);
2519
2520                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2521                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2522                         info->caps |= FE_CAN_INVERSION_AUTO;
2523                 err = 0;
2524                 break;
2525         }
2526
2527         case FE_READ_STATUS: {
2528                 enum fe_status *status = parg;
2529
2530                 /* if retune was requested but hasn't occurred yet, prevent
2531                  * that user get signal state from previous tuning */
2532                 if (fepriv->state == FESTATE_RETUNE ||
2533                     fepriv->state == FESTATE_ERROR) {
2534                         err = 0;
2535                         *status = 0;
2536                         break;
2537                 }
2538
2539                 if (fe->ops.read_status)
2540                         err = fe->ops.read_status(fe, status);
2541                 break;
2542         }
2543
2544         case FE_DISEQC_RESET_OVERLOAD:
2545                 if (fe->ops.diseqc_reset_overload) {
2546                         err = fe->ops.diseqc_reset_overload(fe);
2547                         fepriv->state = FESTATE_DISEQC;
2548                         fepriv->status = 0;
2549                 }
2550                 break;
2551
2552         case FE_DISEQC_SEND_MASTER_CMD:
2553                 if (fe->ops.diseqc_send_master_cmd) {
2554                         struct dvb_diseqc_master_cmd *cmd = parg;
2555
2556                         if (cmd->msg_len > sizeof(cmd->msg)) {
2557                                 err = -EINVAL;
2558                                 break;
2559                         }
2560                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2561                         fepriv->state = FESTATE_DISEQC;
2562                         fepriv->status = 0;
2563                 }
2564                 break;
2565
2566         case FE_DISEQC_SEND_BURST:
2567                 if (fe->ops.diseqc_send_burst) {
2568                         err = fe->ops.diseqc_send_burst(fe, (long)parg);
2569                         fepriv->state = FESTATE_DISEQC;
2570                         fepriv->status = 0;
2571                 }
2572                 break;
2573
2574         case FE_SET_TONE:
2575                 if (fe->ops.set_tone) {
2576                         fepriv->tone = (long)parg;
2577                         err = fe->ops.set_tone(fe, fepriv->tone);
2578                         fepriv->state = FESTATE_DISEQC;
2579                         fepriv->status = 0;
2580                 }
2581                 break;
2582
2583         case FE_SET_VOLTAGE:
2584                 if (fe->ops.set_voltage) {
2585                         fepriv->voltage = (long)parg;
2586                         err = fe->ops.set_voltage(fe, fepriv->voltage);
2587                         fepriv->state = FESTATE_DISEQC;
2588                         fepriv->status = 0;
2589                 }
2590                 break;
2591
2592         case FE_DISEQC_RECV_SLAVE_REPLY:
2593                 if (fe->ops.diseqc_recv_slave_reply)
2594                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2595                 break;
2596
2597         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2598                 if (fe->ops.enable_high_lnb_voltage)
2599                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2600                 break;
2601
2602         case FE_SET_FRONTEND_TUNE_MODE:
2603                 fepriv->tune_mode_flags = (unsigned long)parg;
2604                 err = 0;
2605                 break;
2606         /* DEPRECATED dish control ioctls */
2607
2608         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2609                 if (fe->ops.dishnetwork_send_legacy_command) {
2610                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2611                                                          (unsigned long)parg);
2612                         fepriv->state = FESTATE_DISEQC;
2613                         fepriv->status = 0;
2614                 } else if (fe->ops.set_voltage) {
2615                         /*
2616                          * NOTE: This is a fallback condition.  Some frontends
2617                          * (stv0299 for instance) take longer than 8msec to
2618                          * respond to a set_voltage command.  Those switches
2619                          * need custom routines to switch properly.  For all
2620                          * other frontends, the following should work ok.
2621                          * Dish network legacy switches (as used by Dish500)
2622                          * are controlled by sending 9-bit command words
2623                          * spaced 8msec apart.
2624                          * the actual command word is switch/port dependent
2625                          * so it is up to the userspace application to send
2626                          * the right command.
2627                          * The command must always start with a '0' after
2628                          * initialization, so parg is 8 bits and does not
2629                          * include the initialization or start bit
2630                          */
2631                         unsigned long swcmd = ((unsigned long)parg) << 1;
2632                         ktime_t nexttime;
2633                         ktime_t tv[10];
2634                         int i;
2635                         u8 last = 1;
2636
2637                         if (dvb_frontend_debug)
2638                                 dprintk("switch command: 0x%04lx\n",
2639                                         swcmd);
2640                         nexttime = ktime_get_boottime();
2641                         if (dvb_frontend_debug)
2642                                 tv[0] = nexttime;
2643                         /* before sending a command, initialize by sending
2644                          * a 32ms 18V to the switch
2645                          */
2646                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2647                         dvb_frontend_sleep_until(&nexttime, 32000);
2648
2649                         for (i = 0; i < 9; i++) {
2650                                 if (dvb_frontend_debug)
2651                                         tv[i + 1] = ktime_get_boottime();
2652                                 if ((swcmd & 0x01) != last) {
2653                                         /* set voltage to (last ? 13V : 18V) */
2654                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2655                                         last = (last) ? 0 : 1;
2656                                 }
2657                                 swcmd = swcmd >> 1;
2658                                 if (i != 8)
2659                                         dvb_frontend_sleep_until(&nexttime, 8000);
2660                         }
2661                         if (dvb_frontend_debug) {
2662                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2663                                         fe->dvb->num);
2664                                 for (i = 1; i < 10; i++)
2665                                         pr_info("%d: %d\n", i,
2666                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2667                         }
2668                         err = 0;
2669                         fepriv->state = FESTATE_DISEQC;
2670                         fepriv->status = 0;
2671                 }
2672                 break;
2673
2674         /* DEPRECATED statistics ioctls */
2675
2676         case FE_READ_BER:
2677                 if (fe->ops.read_ber) {
2678                         if (fepriv->thread)
2679                                 err = fe->ops.read_ber(fe, parg);
2680                         else
2681                                 err = -EAGAIN;
2682                 }
2683                 break;
2684
2685         case FE_READ_SIGNAL_STRENGTH:
2686                 if (fe->ops.read_signal_strength) {
2687                         if (fepriv->thread)
2688                                 err = fe->ops.read_signal_strength(fe, parg);
2689                         else
2690                                 err = -EAGAIN;
2691                 }
2692                 break;
2693
2694         case FE_READ_SNR:
2695                 if (fe->ops.read_snr) {
2696                         if (fepriv->thread)
2697                                 err = fe->ops.read_snr(fe, parg);
2698                         else
2699                                 err = -EAGAIN;
2700                 }
2701                 break;
2702
2703         case FE_READ_UNCORRECTED_BLOCKS:
2704                 if (fe->ops.read_ucblocks) {
2705                         if (fepriv->thread)
2706                                 err = fe->ops.read_ucblocks(fe, parg);
2707                         else
2708                                 err = -EAGAIN;
2709                 }
2710                 break;
2711
2712         /* DEPRECATED DVBv3 ioctls */
2713
2714         case FE_SET_FRONTEND:
2715                 err = dvbv3_set_delivery_system(fe);
2716                 if (err)
2717                         break;
2718
2719                 err = dtv_property_cache_sync(fe, c, parg);
2720                 if (err)
2721                         break;
2722                 err = dtv_set_frontend(fe);
2723                 break;
2724
2725         case FE_GET_EVENT:
2726                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2727                 break;
2728
2729         case FE_GET_FRONTEND:
2730                 err = dvb_get_frontend(fe, parg);
2731                 break;
2732
2733         default:
2734                 return -ENOTSUPP;
2735         } /* switch */
2736
2737         return err;
2738 }
2739
2740 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2741 {
2742         struct dvb_device *dvbdev = file->private_data;
2743         struct dvb_frontend *fe = dvbdev->priv;
2744         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2745
2746         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2747
2748         poll_wait(file, &fepriv->events.wait_queue, wait);
2749
2750         if (fepriv->events.eventw != fepriv->events.eventr)
2751                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2752
2753         return 0;
2754 }
2755
2756 static int dvb_frontend_open(struct inode *inode, struct file *file)
2757 {
2758         struct dvb_device *dvbdev = file->private_data;
2759         struct dvb_frontend *fe = dvbdev->priv;
2760         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2761         struct dvb_adapter *adapter = fe->dvb;
2762         int ret;
2763
2764         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2765         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2766                 return -ENODEV;
2767
2768         if (adapter->mfe_shared == 2) {
2769                 mutex_lock(&adapter->mfe_lock);
2770                 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2771                         if (adapter->mfe_dvbdev &&
2772                             !adapter->mfe_dvbdev->writers) {
2773                                 mutex_unlock(&adapter->mfe_lock);
2774                                 return -EBUSY;
2775                         }
2776                         adapter->mfe_dvbdev = dvbdev;
2777                 }
2778         } else if (adapter->mfe_shared) {
2779                 mutex_lock(&adapter->mfe_lock);
2780
2781                 if (!adapter->mfe_dvbdev)
2782                         adapter->mfe_dvbdev = dvbdev;
2783
2784                 else if (adapter->mfe_dvbdev != dvbdev) {
2785                         struct dvb_device
2786                                 *mfedev = adapter->mfe_dvbdev;
2787                         struct dvb_frontend
2788                                 *mfe = mfedev->priv;
2789                         struct dvb_frontend_private
2790                                 *mfepriv = mfe->frontend_priv;
2791                         int mferetry = (dvb_mfe_wait_time << 1);
2792
2793                         mutex_unlock(&adapter->mfe_lock);
2794                         while (mferetry-- && (mfedev->users != -1 ||
2795                                               mfepriv->thread)) {
2796                                 if (msleep_interruptible(500)) {
2797                                         if (signal_pending(current))
2798                                                 return -EINTR;
2799                                 }
2800                         }
2801
2802                         mutex_lock(&adapter->mfe_lock);
2803                         if (adapter->mfe_dvbdev != dvbdev) {
2804                                 mfedev = adapter->mfe_dvbdev;
2805                                 mfe = mfedev->priv;
2806                                 mfepriv = mfe->frontend_priv;
2807                                 if (mfedev->users != -1 ||
2808                                     mfepriv->thread) {
2809                                         mutex_unlock(&adapter->mfe_lock);
2810                                         return -EBUSY;
2811                                 }
2812                                 adapter->mfe_dvbdev = dvbdev;
2813                         }
2814                 }
2815         }
2816
2817         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2818                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2819                         goto err0;
2820
2821                 /* If we took control of the bus, we need to force
2822                    reinitialization.  This is because many ts_bus_ctrl()
2823                    functions strobe the RESET pin on the demod, and if the
2824                    frontend thread already exists then the dvb_init() routine
2825                    won't get called (which is what usually does initial
2826                    register configuration). */
2827                 fepriv->reinitialise = 1;
2828         }
2829
2830         if ((ret = dvb_generic_open(inode, file)) < 0)
2831                 goto err1;
2832
2833         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2834                 /* normal tune mode when opened R/W */
2835                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2836                 fepriv->tone = -1;
2837                 fepriv->voltage = -1;
2838
2839 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2840                 mutex_lock(&fe->dvb->mdev_lock);
2841                 if (fe->dvb->mdev) {
2842                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2843                         if (fe->dvb->mdev->enable_source)
2844                                 ret = fe->dvb->mdev->enable_source(
2845                                                            dvbdev->entity,
2846                                                            &fepriv->pipe);
2847                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2848                         if (ret) {
2849                                 mutex_unlock(&fe->dvb->mdev_lock);
2850                                 dev_err(fe->dvb->device,
2851                                         "Tuner is busy. Error %d\n", ret);
2852                                 goto err2;
2853                         }
2854                 }
2855                 mutex_unlock(&fe->dvb->mdev_lock);
2856 #endif
2857                 ret = dvb_frontend_start(fe);
2858                 if (ret)
2859                         goto err3;
2860
2861                 /*  empty event queue */
2862                 fepriv->events.eventr = fepriv->events.eventw = 0;
2863         }
2864
2865         dvb_frontend_get(fe);
2866
2867         if (adapter->mfe_shared)
2868                 mutex_unlock(&adapter->mfe_lock);
2869         return ret;
2870
2871 err3:
2872 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2873         mutex_lock(&fe->dvb->mdev_lock);
2874         if (fe->dvb->mdev) {
2875                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2876                 if (fe->dvb->mdev->disable_source)
2877                         fe->dvb->mdev->disable_source(dvbdev->entity);
2878                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2879         }
2880         mutex_unlock(&fe->dvb->mdev_lock);
2881 err2:
2882 #endif
2883         dvb_generic_release(inode, file);
2884 err1:
2885         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2886                 fe->ops.ts_bus_ctrl(fe, 0);
2887 err0:
2888         if (adapter->mfe_shared)
2889                 mutex_unlock(&adapter->mfe_lock);
2890         return ret;
2891 }
2892
2893 static int dvb_frontend_release(struct inode *inode, struct file *file)
2894 {
2895         struct dvb_device *dvbdev = file->private_data;
2896         struct dvb_frontend *fe = dvbdev->priv;
2897         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2898         int ret;
2899
2900         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2901
2902         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2903                 fepriv->release_jiffies = jiffies;
2904                 mb();
2905         }
2906
2907         ret = dvb_generic_release(inode, file);
2908
2909         if (dvbdev->users == -1) {
2910                 wake_up(&fepriv->wait_queue);
2911 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2912                 mutex_lock(&fe->dvb->mdev_lock);
2913                 if (fe->dvb->mdev) {
2914                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2915                         if (fe->dvb->mdev->disable_source)
2916                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2917                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2918                 }
2919                 mutex_unlock(&fe->dvb->mdev_lock);
2920 #endif
2921                 if (fe->exit != DVB_FE_NO_EXIT)
2922                         wake_up(&dvbdev->wait_queue);
2923                 if (fe->ops.ts_bus_ctrl)
2924                         fe->ops.ts_bus_ctrl(fe, 0);
2925         }
2926
2927         dvb_frontend_put(fe);
2928
2929         return ret;
2930 }
2931
2932 static const struct file_operations dvb_frontend_fops = {
2933         .owner          = THIS_MODULE,
2934         .unlocked_ioctl = dvb_frontend_ioctl,
2935 #ifdef CONFIG_COMPAT
2936         .compat_ioctl   = dvb_frontend_compat_ioctl,
2937 #endif
2938         .poll           = dvb_frontend_poll,
2939         .open           = dvb_frontend_open,
2940         .release        = dvb_frontend_release,
2941         .llseek         = noop_llseek,
2942 };
2943
2944 int dvb_frontend_suspend(struct dvb_frontend *fe)
2945 {
2946         int ret = 0;
2947
2948         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2949                 fe->id);
2950
2951         if (fe->ops.tuner_ops.suspend)
2952                 ret = fe->ops.tuner_ops.suspend(fe);
2953         else if (fe->ops.tuner_ops.sleep)
2954                 ret = fe->ops.tuner_ops.sleep(fe);
2955
2956         if (fe->ops.suspend)
2957                 ret = fe->ops.suspend(fe);
2958         else if (fe->ops.sleep)
2959                 ret = fe->ops.sleep(fe);
2960
2961         return ret;
2962 }
2963 EXPORT_SYMBOL(dvb_frontend_suspend);
2964
2965 int dvb_frontend_resume(struct dvb_frontend *fe)
2966 {
2967         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2968         int ret = 0;
2969
2970         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2971                 fe->id);
2972
2973         fe->exit = DVB_FE_DEVICE_RESUME;
2974         if (fe->ops.resume)
2975                 ret = fe->ops.resume(fe);
2976         else if (fe->ops.init)
2977                 ret = fe->ops.init(fe);
2978
2979         if (fe->ops.tuner_ops.resume)
2980                 ret = fe->ops.tuner_ops.resume(fe);
2981         else if (fe->ops.tuner_ops.init)
2982                 ret = fe->ops.tuner_ops.init(fe);
2983
2984         if (fe->ops.set_tone && fepriv->tone != -1)
2985                 fe->ops.set_tone(fe, fepriv->tone);
2986         if (fe->ops.set_voltage && fepriv->voltage != -1)
2987                 fe->ops.set_voltage(fe, fepriv->voltage);
2988
2989         fe->exit = DVB_FE_NO_EXIT;
2990         fepriv->state = FESTATE_RETUNE;
2991         dvb_frontend_wakeup(fe);
2992
2993         return ret;
2994 }
2995 EXPORT_SYMBOL(dvb_frontend_resume);
2996
2997 int dvb_register_frontend(struct dvb_adapter *dvb,
2998                           struct dvb_frontend *fe)
2999 {
3000         struct dvb_frontend_private *fepriv;
3001         const struct dvb_device dvbdev_template = {
3002                 .users = ~0,
3003                 .writers = 1,
3004                 .readers = (~0) - 1,
3005                 .fops = &dvb_frontend_fops,
3006 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3007                 .name = fe->ops.info.name,
3008 #endif
3009         };
3010
3011         dev_dbg(dvb->device, "%s:\n", __func__);
3012
3013         if (mutex_lock_interruptible(&frontend_mutex))
3014                 return -ERESTARTSYS;
3015
3016         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3017         if (!fe->frontend_priv) {
3018                 mutex_unlock(&frontend_mutex);
3019                 return -ENOMEM;
3020         }
3021         fepriv = fe->frontend_priv;
3022
3023         kref_init(&fe->refcount);
3024
3025         /*
3026          * After initialization, there need to be two references: one
3027          * for dvb_unregister_frontend(), and another one for
3028          * dvb_frontend_detach().
3029          */
3030         dvb_frontend_get(fe);
3031
3032         sema_init(&fepriv->sem, 1);
3033         init_waitqueue_head(&fepriv->wait_queue);
3034         init_waitqueue_head(&fepriv->events.wait_queue);
3035         mutex_init(&fepriv->events.mtx);
3036         fe->dvb = dvb;
3037         fepriv->inversion = INVERSION_OFF;
3038
3039         dev_info(fe->dvb->device,
3040                  "DVB: registering adapter %i frontend %i (%s)...\n",
3041                  fe->dvb->num, fe->id, fe->ops.info.name);
3042
3043         dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3044                             fe, DVB_DEVICE_FRONTEND, 0);
3045
3046         /*
3047          * Initialize the cache to the proper values according with the
3048          * first supported delivery system (ops->delsys[0])
3049          */
3050
3051         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3052         dvb_frontend_clear_cache(fe);
3053
3054         mutex_unlock(&frontend_mutex);
3055         return 0;
3056 }
3057 EXPORT_SYMBOL(dvb_register_frontend);
3058
3059 int dvb_unregister_frontend(struct dvb_frontend *fe)
3060 {
3061         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3062
3063         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3064
3065         mutex_lock(&frontend_mutex);
3066         dvb_frontend_stop(fe);
3067         dvb_remove_device(fepriv->dvbdev);
3068
3069         /* fe is invalid now */
3070         mutex_unlock(&frontend_mutex);
3071         dvb_frontend_put(fe);
3072         return 0;
3073 }
3074 EXPORT_SYMBOL(dvb_unregister_frontend);
3075
3076 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3077                                         void (*release)(struct dvb_frontend *fe))
3078 {
3079         if (release) {
3080                 release(fe);
3081 #ifdef CONFIG_MEDIA_ATTACH
3082                 dvb_detach(release);
3083 #endif
3084         }
3085 }
3086
3087 void dvb_frontend_detach(struct dvb_frontend *fe)
3088 {
3089         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3090         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3091         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3092         dvb_frontend_put(fe);
3093 }
3094 EXPORT_SYMBOL(dvb_frontend_detach);