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