drivers/media/dvb-core/dvb_frontend.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dvb_frontend.c: DVB frontend tuning interface/thread
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  */
  12
  13 /* Enables DVBv3 compatibility bits at the headers */
  14 #define __DVB_CORE__
  15
  16 #define pr_fmt(fmt) "dvb_frontend: " fmt
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/wait.h>
  22 #include <linux/slab.h>
  23 #include <linux/poll.h>
  24 #include <linux/semaphore.h>
  25 #include <linux/module.h>
  26 #include <linux/list.h>
  27 #include <linux/freezer.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kthread.h>
  30 #include <linux/ktime.h>
  31 #include <linux/compat.h>
  32 #include <asm/processor.h>
  33
  34 #include <media/dvb_frontend.h>
  35 #include <media/dvbdev.h>
  36 #include <linux/dvb/version.h>
  37
  38 static int dvb_frontend_debug;
  39 static int dvb_shutdown_timeout;
  40 static int dvb_force_auto_inversion;
  41 static int dvb_override_tune_delay;
  42 static int dvb_powerdown_on_sleep = 1;
  43 static int dvb_mfe_wait_time = 5;
  44
  45 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  46 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  47 module_param(dvb_shutdown_timeout, int, 0644);
  48 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  49 module_param(dvb_force_auto_inversion, int, 0644);
  50 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  51 module_param(dvb_override_tune_delay, int, 0644);
  52 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  53 module_param(dvb_powerdown_on_sleep, int, 0644);
  54 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  55 module_param(dvb_mfe_wait_time, int, 0644);
  56 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  57
  58 #define dprintk(fmt, arg...) \
  59         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  60
  61 #define FESTATE_IDLE 1
  62 #define FESTATE_RETUNE 2
  63 #define FESTATE_TUNING_FAST 4
  64 #define FESTATE_TUNING_SLOW 8
  65 #define FESTATE_TUNED 16
  66 #define FESTATE_ZIGZAG_FAST 32
  67 #define FESTATE_ZIGZAG_SLOW 64
  68 #define FESTATE_DISEQC 128
  69 #define FESTATE_ERROR 256
  70 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  71 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  72 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  73 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  74
  75 /*
  76  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  77  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  78  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  79  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  80  * FESTATE_TUNED. The frontend has successfully locked on.
  81  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  82  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  83  * FESTATE_DISEQC. A DISEQC command has just been issued.
  84  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  85  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  86  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  87  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  88  */
  89
  90 static DEFINE_MUTEX(frontend_mutex);
  91
  92 struct dvb_frontend_private {
  93         /* thread/frontend values */
  94         struct dvb_device *dvbdev;
  95         struct dvb_frontend_parameters parameters_out;
  96         struct dvb_fe_events events;
  97         struct semaphore sem;
  98         struct list_head list_head;
  99         wait_queue_head_t wait_queue;
 100         struct task_struct *thread;
 101         unsigned long release_jiffies;
 102         unsigned int wakeup;
 103         enum fe_status status;
 104         unsigned long tune_mode_flags;
 105         unsigned int delay;
 106         unsigned int reinitialise;
 107         int tone;
 108         int voltage;
 109
 110         /* swzigzag values */
 111         unsigned int state;
 112         unsigned int bending;
 113         int lnb_drift;
 114         unsigned int inversion;
 115         unsigned int auto_step;
 116         unsigned int auto_sub_step;
 117         unsigned int started_auto_step;
 118         unsigned int min_delay;
 119         unsigned int max_drift;
 120         unsigned int step_size;
 121         int quality;
 122         unsigned int check_wrapped;
 123         enum dvbfe_search algo_status;
 124
 125 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 126         struct media_pipeline pipe;
 127 #endif
 128 };
 129
 130 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 131                                         void (*release)(struct dvb_frontend *fe));
 132
 133 static void __dvb_frontend_free(struct dvb_frontend *fe)
 134 {
 135         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 136
 137         if (fepriv)
 138                 dvb_free_device(fepriv->dvbdev);
 139
 140         dvb_frontend_invoke_release(fe, fe->ops.release);
 141
 142         kfree(fepriv);
 143 }
 144
 145 static void dvb_frontend_free(struct kref *ref)
 146 {
 147         struct dvb_frontend *fe =
 148                 container_of(ref, struct dvb_frontend, refcount);
 149
 150         __dvb_frontend_free(fe);
 151 }
 152
 153 static void dvb_frontend_put(struct dvb_frontend *fe)
 154 {
 155         /* call detach before dropping the reference count */
 156         if (fe->ops.detach)
 157                 fe->ops.detach(fe);
 158         /*
 159          * Check if the frontend was registered, as otherwise
 160          * kref was not initialized yet.
 161          */
 162         if (fe->frontend_priv)
 163                 kref_put(&fe->refcount, dvb_frontend_free);
 164         else
 165                 __dvb_frontend_free(fe);
 166 }
 167
 168 static void dvb_frontend_get(struct dvb_frontend *fe)
 169 {
 170         kref_get(&fe->refcount);
 171 }
 172
 173 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 174 static int dtv_get_frontend(struct dvb_frontend *fe,
 175                             struct dtv_frontend_properties *c,
 176                             struct dvb_frontend_parameters *p_out);
 177 static int
 178 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 179                                 const struct dtv_frontend_properties *c,
 180                                 struct dvb_frontend_parameters *p);
 181
 182 static bool has_get_frontend(struct dvb_frontend *fe)
 183 {
 184         return fe->ops.get_frontend;
 185 }
 186
 187 /*
 188  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 189  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 190  * otherwise, a DVBv3 call will fail.
 191  */
 192 enum dvbv3_emulation_type {
 193         DVBV3_UNKNOWN,
 194         DVBV3_QPSK,
 195         DVBV3_QAM,
 196         DVBV3_OFDM,
 197         DVBV3_ATSC,
 198 };
 199
 200 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 201 {
 202         switch (delivery_system) {
 203         case SYS_DVBC_ANNEX_A:
 204         case SYS_DVBC_ANNEX_C:
 205                 return DVBV3_QAM;
 206         case SYS_DVBS:
 207         case SYS_DVBS2:
 208         case SYS_TURBO:
 209         case SYS_ISDBS:
 210         case SYS_DSS:
 211                 return DVBV3_QPSK;
 212         case SYS_DVBT:
 213         case SYS_DVBT2:
 214         case SYS_ISDBT:
 215         case SYS_DTMB:
 216                 return DVBV3_OFDM;
 217         case SYS_ATSC:
 218         case SYS_ATSCMH:
 219         case SYS_DVBC_ANNEX_B:
 220                 return DVBV3_ATSC;
 221         case SYS_UNDEFINED:
 222         case SYS_ISDBC:
 223         case SYS_DVBH:
 224         case SYS_DAB:
 225         default:
 226                 /*
 227                  * Doesn't know how to emulate those types and/or
 228                  * there's no frontend driver from this type yet
 229                  * with some emulation code, so, we're not sure yet how
 230                  * to handle them, or they're not compatible with a DVBv3 call.
 231                  */
 232                 return DVBV3_UNKNOWN;
 233         }
 234 }
 235
 236 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 237                                    enum fe_status status)
 238 {
 239         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 240         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 241         struct dvb_fe_events *events = &fepriv->events;
 242         struct dvb_frontend_event *e;
 243         int wp;
 244
 245         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 246
 247         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 248                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 249
 250         mutex_lock(&events->mtx);
 251
 252         wp = (events->eventw + 1) % MAX_EVENT;
 253         if (wp == events->eventr) {
 254                 events->overflow = 1;
 255                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 256         }
 257
 258         e = &events->events[events->eventw];
 259         e->status = status;
 260         e->parameters = fepriv->parameters_out;
 261
 262         events->eventw = wp;
 263
 264         mutex_unlock(&events->mtx);
 265
 266         wake_up_interruptible(&events->wait_queue);
 267 }
 268
 269 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 270                                    struct dvb_fe_events *events)
 271 {
 272         int ret;
 273
 274         up(&fepriv->sem);
 275         ret = events->eventw != events->eventr;
 276         down(&fepriv->sem);
 277
 278         return ret;
 279 }
 280
 281 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 282                                   struct dvb_frontend_event *event, int flags)
 283 {
 284         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 285         struct dvb_fe_events *events = &fepriv->events;
 286
 287         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 288
 289         if (events->overflow) {
 290                 events->overflow = 0;
 291                 return -EOVERFLOW;
 292         }
 293
 294         if (events->eventw == events->eventr) {
 295                 int ret;
 296
 297                 if (flags & O_NONBLOCK)
 298                         return -EWOULDBLOCK;
 299
 300                 ret = wait_event_interruptible(events->wait_queue,
 301                                                dvb_frontend_test_event(fepriv, events));
 302
 303                 if (ret < 0)
 304                         return ret;
 305         }
 306
 307         mutex_lock(&events->mtx);
 308         *event = events->events[events->eventr];
 309         events->eventr = (events->eventr + 1) % MAX_EVENT;
 310         mutex_unlock(&events->mtx);
 311
 312         return 0;
 313 }
 314
 315 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 316 {
 317         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 318         struct dvb_fe_events *events = &fepriv->events;
 319
 320         mutex_lock(&events->mtx);
 321         events->eventr = events->eventw;
 322         mutex_unlock(&events->mtx);
 323 }
 324
 325 static void dvb_frontend_init(struct dvb_frontend *fe)
 326 {
 327         dev_dbg(fe->dvb->device,
 328                 "%s: initialising adapter %i frontend %i (%s)...\n",
 329                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 330
 331         if (fe->ops.init)
 332                 fe->ops.init(fe);
 333         if (fe->ops.tuner_ops.init) {
 334                 if (fe->ops.i2c_gate_ctrl)
 335                         fe->ops.i2c_gate_ctrl(fe, 1);
 336                 fe->ops.tuner_ops.init(fe);
 337                 if (fe->ops.i2c_gate_ctrl)
 338                         fe->ops.i2c_gate_ctrl(fe, 0);
 339         }
 340 }
 341
 342 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 343 {
 344         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 345
 346         fepriv->reinitialise = 1;
 347         dvb_frontend_wakeup(fe);
 348 }
 349 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 350
 351 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 352 {
 353         int q2;
 354         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 355
 356         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 357
 358         if (locked)
 359                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 360         else
 361                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 362
 363         q2 = fepriv->quality - 128;
 364         q2 *= q2;
 365
 366         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 367 }
 368
 369 /**
 370  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 371  *      parameters.
 372  *
 373  * @fe: The frontend concerned.
 374  * @check_wrapped: Checks if an iteration has completed.
 375  *                 DO NOT SET ON THE FIRST ATTEMPT.
 376  *
 377  * return: Number of complete iterations that have been performed.
 378  */
 379 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 380 {
 381         int autoinversion;
 382         int ready = 0;
 383         int fe_set_err = 0;
 384         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 385         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 386         int original_inversion = c->inversion;
 387         u32 original_frequency = c->frequency;
 388
 389         /* are we using autoinversion? */
 390         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 391                          (c->inversion == INVERSION_AUTO));
 392
 393         /* setup parameters correctly */
 394         while (!ready) {
 395                 /* calculate the lnb_drift */
 396                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 397
 398                 /* wrap the auto_step if we've exceeded the maximum drift */
 399                 if (fepriv->lnb_drift > fepriv->max_drift) {
 400                         fepriv->auto_step = 0;
 401                         fepriv->auto_sub_step = 0;
 402                         fepriv->lnb_drift = 0;
 403                 }
 404
 405                 /* perform inversion and +/- zigzag */
 406                 switch (fepriv->auto_sub_step) {
 407                 case 0:
 408                         /* try with the current inversion and current drift setting */
 409                         ready = 1;
 410                         break;
 411
 412                 case 1:
 413                         if (!autoinversion) break;
 414
 415                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 416                         ready = 1;
 417                         break;
 418
 419                 case 2:
 420                         if (fepriv->lnb_drift == 0) break;
 421
 422                         fepriv->lnb_drift = -fepriv->lnb_drift;
 423                         ready = 1;
 424                         break;
 425
 426                 case 3:
 427                         if (fepriv->lnb_drift == 0) break;
 428                         if (!autoinversion) break;
 429
 430                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 431                         fepriv->lnb_drift = -fepriv->lnb_drift;
 432                         ready = 1;
 433                         break;
 434
 435                 default:
 436                         fepriv->auto_step++;
 437                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 438                         break;
 439                 }
 440
 441                 if (!ready) fepriv->auto_sub_step++;
 442         }
 443
 444         /* if this attempt would hit where we started, indicate a complete
 445          * iteration has occurred */
 446         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 447             (fepriv->auto_sub_step == 0) && check_wrapped) {
 448                 return 1;
 449         }
 450
 451         dev_dbg(fe->dvb->device,
 452                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 453                 __func__, fepriv->lnb_drift, fepriv->inversion,
 454                 fepriv->auto_step, fepriv->auto_sub_step,
 455                 fepriv->started_auto_step);
 456
 457         /* set the frontend itself */
 458         c->frequency += fepriv->lnb_drift;
 459         if (autoinversion)
 460                 c->inversion = fepriv->inversion;
 461         tmp = *c;
 462         if (fe->ops.set_frontend)
 463                 fe_set_err = fe->ops.set_frontend(fe);
 464         *c = tmp;
 465         if (fe_set_err < 0) {
 466                 fepriv->state = FESTATE_ERROR;
 467                 return fe_set_err;
 468         }
 469
 470         c->frequency = original_frequency;
 471         c->inversion = original_inversion;
 472
 473         fepriv->auto_sub_step++;
 474         return 0;
 475 }
 476
 477 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 478 {
 479         enum fe_status s = FE_NONE;
 480         int retval = 0;
 481         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 482         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 483
 484         /* if we've got no parameters, just keep idling */
 485         if (fepriv->state & FESTATE_IDLE) {
 486                 fepriv->delay = 3 * HZ;
 487                 fepriv->quality = 0;
 488                 return;
 489         }
 490
 491         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 492         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 493                 if (fepriv->state & FESTATE_RETUNE) {
 494                         tmp = *c;
 495                         if (fe->ops.set_frontend)
 496                                 retval = fe->ops.set_frontend(fe);
 497                         *c = tmp;
 498                         if (retval < 0)
 499                                 fepriv->state = FESTATE_ERROR;
 500                         else
 501                                 fepriv->state = FESTATE_TUNED;
 502                 }
 503                 fepriv->delay = 3 * HZ;
 504                 fepriv->quality = 0;
 505                 return;
 506         }
 507
 508         /* get the frontend status */
 509         if (fepriv->state & FESTATE_RETUNE) {
 510                 s = 0;
 511         } else {
 512                 if (fe->ops.read_status)
 513                         fe->ops.read_status(fe, &s);
 514                 if (s != fepriv->status) {
 515                         dvb_frontend_add_event(fe, s);
 516                         fepriv->status = s;
 517                 }
 518         }
 519
 520         /* if we're not tuned, and we have a lock, move to the TUNED state */
 521         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 522                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 523                 fepriv->state = FESTATE_TUNED;
 524
 525                 /* if we're tuned, then we have determined the correct inversion */
 526                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 527                     (c->inversion == INVERSION_AUTO)) {
 528                         c->inversion = fepriv->inversion;
 529                 }
 530                 return;
 531         }
 532
 533         /* if we are tuned already, check we're still locked */
 534         if (fepriv->state & FESTATE_TUNED) {
 535                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 536
 537                 /* we're tuned, and the lock is still good... */
 538                 if (s & FE_HAS_LOCK) {
 539                         return;
 540                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 541                         fepriv->state = FESTATE_ZIGZAG_FAST;
 542                         fepriv->started_auto_step = fepriv->auto_step;
 543                         fepriv->check_wrapped = 0;
 544                 }
 545         }
 546
 547         /* don't actually do anything if we're in the LOSTLOCK state,
 548          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 549         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 550             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 551                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 552                 return;
 553         }
 554
 555         /* don't do anything if we're in the DISEQC state, since this
 556          * might be someone with a motorized dish controlled by DISEQC.
 557          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 558         if (fepriv->state & FESTATE_DISEQC) {
 559                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 560                 return;
 561         }
 562
 563         /* if we're in the RETUNE state, set everything up for a brand
 564          * new scan, keeping the current inversion setting, as the next
 565          * tune is _very_ likely to require the same */
 566         if (fepriv->state & FESTATE_RETUNE) {
 567                 fepriv->lnb_drift = 0;
 568                 fepriv->auto_step = 0;
 569                 fepriv->auto_sub_step = 0;
 570                 fepriv->started_auto_step = 0;
 571                 fepriv->check_wrapped = 0;
 572         }
 573
 574         /* fast zigzag. */
 575         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 576                 fepriv->delay = fepriv->min_delay;
 577
 578                 /* perform a tune */
 579                 retval = dvb_frontend_swzigzag_autotune(fe,
 580                                                         fepriv->check_wrapped);
 581                 if (retval < 0) {
 582                         return;
 583                 } else if (retval) {
 584                         /* OK, if we've run out of trials at the fast speed.
 585                          * Drop back to slow for the _next_ attempt */
 586                         fepriv->state = FESTATE_SEARCHING_SLOW;
 587                         fepriv->started_auto_step = fepriv->auto_step;
 588                         return;
 589                 }
 590                 fepriv->check_wrapped = 1;
 591
 592                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 593                  * This ensures we cannot return from an
 594                  * FE_SET_FRONTEND ioctl before the first frontend tune
 595                  * occurs */
 596                 if (fepriv->state & FESTATE_RETUNE) {
 597                         fepriv->state = FESTATE_TUNING_FAST;
 598                 }
 599         }
 600
 601         /* slow zigzag */
 602         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 603                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 604
 605                 /* Note: don't bother checking for wrapping; we stay in this
 606                  * state until we get a lock */
 607                 dvb_frontend_swzigzag_autotune(fe, 0);
 608         }
 609 }
 610
 611 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 612 {
 613         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 614
 615         if (fe->exit != DVB_FE_NO_EXIT)
 616                 return 1;
 617
 618         if (fepriv->dvbdev->writers == 1)
 619                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 620                                   dvb_shutdown_timeout * HZ))
 621                         return 1;
 622
 623         return 0;
 624 }
 625
 626 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 627 {
 628         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 629
 630         if (fepriv->wakeup) {
 631                 fepriv->wakeup = 0;
 632                 return 1;
 633         }
 634         return dvb_frontend_is_exiting(fe);
 635 }
 636
 637 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 638 {
 639         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 640
 641         fepriv->wakeup = 1;
 642         wake_up_interruptible(&fepriv->wait_queue);
 643 }
 644
 645 static int dvb_frontend_thread(void *data)
 646 {
 647         struct dvb_frontend *fe = data;
 648         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 649         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 650         enum fe_status s = FE_NONE;
 651         enum dvbfe_algo algo;
 652         bool re_tune = false;
 653         bool semheld = false;
 654
 655         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 656
 657         fepriv->check_wrapped = 0;
 658         fepriv->quality = 0;
 659         fepriv->delay = 3 * HZ;
 660         fepriv->status = 0;
 661         fepriv->wakeup = 0;
 662         fepriv->reinitialise = 0;
 663
 664         dvb_frontend_init(fe);
 665
 666         set_freezable();
 667         while (1) {
 668                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 669 restart:
 670                 wait_event_interruptible_timeout(fepriv->wait_queue,
 671                                                  dvb_frontend_should_wakeup(fe) ||
 672                                                  kthread_should_stop() ||
 673                                                  freezing(current),
 674                         fepriv->delay);
 675
 676                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 677                         /* got signal or quitting */
 678                         if (!down_interruptible(&fepriv->sem))
 679                                 semheld = true;
 680                         fe->exit = DVB_FE_NORMAL_EXIT;
 681                         break;
 682                 }
 683
 684                 if (try_to_freeze())
 685                         goto restart;
 686
 687                 if (down_interruptible(&fepriv->sem))
 688                         break;
 689
 690                 if (fepriv->reinitialise) {
 691                         dvb_frontend_init(fe);
 692                         if (fe->ops.set_tone && fepriv->tone != -1)
 693                                 fe->ops.set_tone(fe, fepriv->tone);
 694                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 695                                 fe->ops.set_voltage(fe, fepriv->voltage);
 696                         fepriv->reinitialise = 0;
 697                 }
 698
 699                 /* do an iteration of the tuning loop */
 700                 if (fe->ops.get_frontend_algo) {
 701                         algo = fe->ops.get_frontend_algo(fe);
 702                         switch (algo) {
 703                         case DVBFE_ALGO_HW:
 704                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 705
 706                                 if (fepriv->state & FESTATE_RETUNE) {
 707                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 708                                         re_tune = true;
 709                                         fepriv->state = FESTATE_TUNED;
 710                                 } else {
 711                                         re_tune = false;
 712                                 }
 713
 714                                 if (fe->ops.tune)
 715                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 716
 717                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 718                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 719                                         dvb_frontend_add_event(fe, s);
 720                                         fepriv->status = s;
 721                                 }
 722                                 break;
 723                         case DVBFE_ALGO_SW:
 724                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 725                                 dvb_frontend_swzigzag(fe);
 726                                 break;
 727                         case DVBFE_ALGO_CUSTOM:
 728                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 729                                 if (fepriv->state & FESTATE_RETUNE) {
 730                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 731                                         fepriv->state = FESTATE_TUNED;
 732                                 }
 733                                 /* Case where we are going to search for a carrier
 734                                  * User asked us to retune again for some reason, possibly
 735                                  * requesting a search with a new set of parameters
 736                                  */
 737                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 738                                         if (fe->ops.search) {
 739                                                 fepriv->algo_status = fe->ops.search(fe);
 740                                                 /* We did do a search as was requested, the flags are
 741                                                  * now unset as well and has the flags wrt to search.
 742                                                  */
 743                                         } else {
 744                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 745                                         }
 746                                 }
 747                                 /* Track the carrier if the search was successful */
 748                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 749                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 750                                         fepriv->delay = HZ / 2;
 751                                 }
 752                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 753                                 fe->ops.read_status(fe, &s);
 754                                 if (s != fepriv->status) {
 755                                         dvb_frontend_add_event(fe, s); /* update event list */
 756                                         fepriv->status = s;
 757                                         if (!(s & FE_HAS_LOCK)) {
 758                                                 fepriv->delay = HZ / 10;
 759                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 760                                         } else {
 761                                                 fepriv->delay = 60 * HZ;
 762                                         }
 763                                 }
 764                                 break;
 765                         default:
 766                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 767                                 break;
 768                         }
 769                 } else {
 770                         dvb_frontend_swzigzag(fe);
 771                 }
 772         }
 773
 774         if (dvb_powerdown_on_sleep) {
 775                 if (fe->ops.set_voltage)
 776                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 777                 if (fe->ops.tuner_ops.sleep) {
 778                         if (fe->ops.i2c_gate_ctrl)
 779                                 fe->ops.i2c_gate_ctrl(fe, 1);
 780                         fe->ops.tuner_ops.sleep(fe);
 781                         if (fe->ops.i2c_gate_ctrl)
 782                                 fe->ops.i2c_gate_ctrl(fe, 0);
 783                 }
 784                 if (fe->ops.sleep)
 785                         fe->ops.sleep(fe);
 786         }
 787
 788         fepriv->thread = NULL;
 789         if (kthread_should_stop())
 790                 fe->exit = DVB_FE_DEVICE_REMOVED;
 791         else
 792                 fe->exit = DVB_FE_NO_EXIT;
 793         mb();
 794
 795         if (semheld)
 796                 up(&fepriv->sem);
 797         dvb_frontend_wakeup(fe);
 798         return 0;
 799 }
 800
 801 static void dvb_frontend_stop(struct dvb_frontend *fe)
 802 {
 803         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 804
 805         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 806
 807         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 808                 fe->exit = DVB_FE_NORMAL_EXIT;
 809         mb();
 810
 811         if (!fepriv->thread)
 812                 return;
 813
 814         kthread_stop(fepriv->thread);
 815
 816         sema_init(&fepriv->sem, 1);
 817         fepriv->state = FESTATE_IDLE;
 818
 819         /* paranoia check in case a signal arrived */
 820         if (fepriv->thread)
 821                 dev_warn(fe->dvb->device,
 822                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 823                          fepriv->thread);
 824 }
 825
 826 /*
 827  * Sleep for the amount of time given by add_usec parameter
 828  *
 829  * This needs to be as precise as possible, as it affects the detection of
 830  * the dish tone command at the satellite subsystem. The precision is improved
 831  * by using a scheduled msleep followed by udelay for the remainder.
 832  */
 833 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 834 {
 835         s32 delta;
 836
 837         *waketime = ktime_add_us(*waketime, add_usec);
 838         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 839         if (delta > 2500) {
 840                 msleep((delta - 1500) / 1000);
 841                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 842         }
 843         if (delta > 0)
 844                 udelay(delta);
 845 }
 846 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 847
 848 static int dvb_frontend_start(struct dvb_frontend *fe)
 849 {
 850         int ret;
 851         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 852         struct task_struct *fe_thread;
 853
 854         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 855
 856         if (fepriv->thread) {
 857                 if (fe->exit == DVB_FE_NO_EXIT)
 858                         return 0;
 859                 else
 860                         dvb_frontend_stop(fe);
 861         }
 862
 863         if (signal_pending(current))
 864                 return -EINTR;
 865         if (down_interruptible(&fepriv->sem))
 866                 return -EINTR;
 867
 868         fepriv->state = FESTATE_IDLE;
 869         fe->exit = DVB_FE_NO_EXIT;
 870         fepriv->thread = NULL;
 871         mb();
 872
 873         fe_thread = kthread_run(dvb_frontend_thread, fe,
 874                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 875         if (IS_ERR(fe_thread)) {
 876                 ret = PTR_ERR(fe_thread);
 877                 dev_warn(fe->dvb->device,
 878                          "dvb_frontend_start: failed to start kthread (%d)\n",
 879                          ret);
 880                 up(&fepriv->sem);
 881                 return ret;
 882         }
 883         fepriv->thread = fe_thread;
 884         return 0;
 885 }
 886
 887 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 888                                               u32 *freq_min, u32 *freq_max,
 889                                               u32 *tolerance)
 890 {
 891         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 892         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 893         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 894         u32 frontend_min = fe->ops.info.frequency_min_hz;
 895         u32 frontend_max = fe->ops.info.frequency_max_hz;
 896
 897         *freq_min = max(frontend_min, tuner_min);
 898
 899         if (frontend_max == 0)
 900                 *freq_max = tuner_max;
 901         else if (tuner_max == 0)
 902                 *freq_max = frontend_max;
 903         else
 904                 *freq_max = min(frontend_max, tuner_max);
 905
 906         if (*freq_min == 0 || *freq_max == 0)
 907                 dev_warn(fe->dvb->device,
 908                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 909                          fe->dvb->num, fe->id);
 910
 911         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 912                 tuner_min, tuner_max, frontend_min, frontend_max);
 913
 914         /* If the standard is for satellite, convert frequencies to kHz */
 915         switch (c->delivery_system) {
 916         case SYS_DVBS:
 917         case SYS_DVBS2:
 918         case SYS_TURBO:
 919         case SYS_ISDBS:
 920                 *freq_min /= kHz;
 921                 *freq_max /= kHz;
 922                 if (tolerance)
 923                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 924
 925                 break;
 926         default:
 927                 if (tolerance)
 928                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 929                 break;
 930         }
 931 }
 932
 933 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 934 {
 935         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 936         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 937         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 938         u32 step = max(fe_step, tuner_step);
 939
 940         switch (c->delivery_system) {
 941         case SYS_DVBS:
 942         case SYS_DVBS2:
 943         case SYS_TURBO:
 944         case SYS_ISDBS:
 945                 step /= kHz;
 946                 break;
 947         default:
 948                 break;
 949         }
 950
 951         return step;
 952 }
 953
 954 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 955 {
 956         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 957         u32 freq_min;
 958         u32 freq_max;
 959
 960         /* range check: frequency */
 961         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 962         if ((freq_min && c->frequency < freq_min) ||
 963             (freq_max && c->frequency > freq_max)) {
 964                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 965                          fe->dvb->num, fe->id, c->frequency,
 966                          freq_min, freq_max);
 967                 return -EINVAL;
 968         }
 969
 970         /* range check: symbol rate */
 971         switch (c->delivery_system) {
 972         case SYS_DVBS:
 973         case SYS_DVBS2:
 974         case SYS_TURBO:
 975         case SYS_DVBC_ANNEX_A:
 976         case SYS_DVBC_ANNEX_C:
 977                 if ((fe->ops.info.symbol_rate_min &&
 978                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 979                     (fe->ops.info.symbol_rate_max &&
 980                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 981                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 982                                  fe->dvb->num, fe->id, c->symbol_rate,
 983                                  fe->ops.info.symbol_rate_min,
 984                                  fe->ops.info.symbol_rate_max);
 985                         return -EINVAL;
 986                 }
 987                 break;
 988         default:
 989                 break;
 990         }
 991
 992         return 0;
 993 }
 994
 995 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 996 {
 997         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 998         int i;
 999         u32 delsys;
1000
1001         delsys = c->delivery_system;
1002         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1003         c->delivery_system = delsys;
1004
1005         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1006                 __func__, c->delivery_system);
1007
1008         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1009         c->bandwidth_hz = 0;    /* AUTO */
1010         c->guard_interval = GUARD_INTERVAL_AUTO;
1011         c->hierarchy = HIERARCHY_AUTO;
1012         c->symbol_rate = 0;
1013         c->code_rate_HP = FEC_AUTO;
1014         c->code_rate_LP = FEC_AUTO;
1015         c->fec_inner = FEC_AUTO;
1016         c->rolloff = ROLLOFF_AUTO;
1017         c->voltage = SEC_VOLTAGE_OFF;
1018         c->sectone = SEC_TONE_OFF;
1019         c->pilot = PILOT_AUTO;
1020
1021         c->isdbt_partial_reception = 0;
1022         c->isdbt_sb_mode = 0;
1023         c->isdbt_sb_subchannel = 0;
1024         c->isdbt_sb_segment_idx = 0;
1025         c->isdbt_sb_segment_count = 0;
1026         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1027         for (i = 0; i < 3; i++) {
1028                 c->layer[i].fec = FEC_AUTO;
1029                 c->layer[i].modulation = QAM_AUTO;
1030                 c->layer[i].interleaving = 0;
1031                 c->layer[i].segment_count = 0;
1032         }
1033
1034         c->stream_id = NO_STREAM_ID_FILTER;
1035         c->scrambling_sequence_index = 0;/* default sequence */
1036
1037         switch (c->delivery_system) {
1038         case SYS_DVBS:
1039         case SYS_DVBS2:
1040         case SYS_TURBO:
1041                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1042                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1043                 break;
1044         case SYS_ATSC:
1045                 c->modulation = VSB_8;
1046                 break;
1047         case SYS_ISDBS:
1048                 c->symbol_rate = 28860000;
1049                 c->rolloff = ROLLOFF_35;
1050                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1051                 break;
1052         default:
1053                 c->modulation = QAM_AUTO;
1054                 break;
1055         }
1056
1057         c->lna = LNA_AUTO;
1058
1059         return 0;
1060 }
1061
1062 #define _DTV_CMD(n, s, b) \
1063 [n] = { \
1064         .name = #n, \
1065         .cmd  = n, \
1066         .set  = s,\
1067         .buffer = b \
1068 }
1069
1070 struct dtv_cmds_h {
1071         char    *name;          /* A display name for debugging purposes */
1072
1073         __u32   cmd;            /* A unique ID */
1074
1075         /* Flags */
1076         __u32   set:1;          /* Either a set or get property */
1077         __u32   buffer:1;       /* Does this property use the buffer? */
1078         __u32   reserved:30;    /* Align */
1079 };
1080
1081 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1082         _DTV_CMD(DTV_TUNE, 1, 0),
1083         _DTV_CMD(DTV_CLEAR, 1, 0),
1084
1085         /* Set */
1086         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1087         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1088         _DTV_CMD(DTV_MODULATION, 1, 0),
1089         _DTV_CMD(DTV_INVERSION, 1, 0),
1090         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1091         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1092         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1093         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1094         _DTV_CMD(DTV_TONE, 1, 0),
1095         _DTV_CMD(DTV_PILOT, 1, 0),
1096         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1097         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1098         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1099         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1100         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1101         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1102         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1103         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1104
1105         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1106         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1107         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1108         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1109         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1110         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1111         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1112         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1113         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1114         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1115         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1116         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1117         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1118         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1119         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1120         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1121         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1122         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1123
1124         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1125         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1126         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1127         _DTV_CMD(DTV_LNA, 1, 0),
1128
1129         /* Get */
1130         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1131         _DTV_CMD(DTV_API_VERSION, 0, 0),
1132
1133         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1134
1135         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1136         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1137
1138         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1139         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1140         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1141         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1142         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1143         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1144         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1145         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1146         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1147         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1148         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1149         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1150         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1151
1152         /* Statistics API */
1153         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1154         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1155         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1156         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1157         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1158         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1159         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1160         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1161 };
1162
1163 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1164  * drivers can use a single set_frontend tuning function, regardless of whether
1165  * it's being used for the legacy or new API, reducing code and complexity.
1166  */
1167 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1168                                    struct dtv_frontend_properties *c,
1169                                    const struct dvb_frontend_parameters *p)
1170 {
1171         c->frequency = p->frequency;
1172         c->inversion = p->inversion;
1173
1174         switch (dvbv3_type(c->delivery_system)) {
1175         case DVBV3_QPSK:
1176                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1177                 c->symbol_rate = p->u.qpsk.symbol_rate;
1178                 c->fec_inner = p->u.qpsk.fec_inner;
1179                 break;
1180         case DVBV3_QAM:
1181                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1182                 c->symbol_rate = p->u.qam.symbol_rate;
1183                 c->fec_inner = p->u.qam.fec_inner;
1184                 c->modulation = p->u.qam.modulation;
1185                 break;
1186         case DVBV3_OFDM:
1187                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1188
1189                 switch (p->u.ofdm.bandwidth) {
1190                 case BANDWIDTH_10_MHZ:
1191                         c->bandwidth_hz = 10000000;
1192                         break;
1193                 case BANDWIDTH_8_MHZ:
1194                         c->bandwidth_hz = 8000000;
1195                         break;
1196                 case BANDWIDTH_7_MHZ:
1197                         c->bandwidth_hz = 7000000;
1198                         break;
1199                 case BANDWIDTH_6_MHZ:
1200                         c->bandwidth_hz = 6000000;
1201                         break;
1202                 case BANDWIDTH_5_MHZ:
1203                         c->bandwidth_hz = 5000000;
1204                         break;
1205                 case BANDWIDTH_1_712_MHZ:
1206                         c->bandwidth_hz = 1712000;
1207                         break;
1208                 case BANDWIDTH_AUTO:
1209                         c->bandwidth_hz = 0;
1210                 }
1211
1212                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1213                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1214                 c->modulation = p->u.ofdm.constellation;
1215                 c->transmission_mode = p->u.ofdm.transmission_mode;
1216                 c->guard_interval = p->u.ofdm.guard_interval;
1217                 c->hierarchy = p->u.ofdm.hierarchy_information;
1218                 break;
1219         case DVBV3_ATSC:
1220                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1221                 c->modulation = p->u.vsb.modulation;
1222                 if (c->delivery_system == SYS_ATSCMH)
1223                         break;
1224                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1225                         c->delivery_system = SYS_ATSC;
1226                 else
1227                         c->delivery_system = SYS_DVBC_ANNEX_B;
1228                 break;
1229         case DVBV3_UNKNOWN:
1230                 dev_err(fe->dvb->device,
1231                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1232                         __func__, c->delivery_system);
1233                 return -EINVAL;
1234         }
1235
1236         return 0;
1237 }
1238
1239 /* Ensure the cached values are set correctly in the frontend
1240  * legacy tuning structures, for the advanced tuning API.
1241  */
1242 static int
1243 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1244                                 const struct dtv_frontend_properties *c,
1245                                 struct dvb_frontend_parameters *p)
1246 {
1247         p->frequency = c->frequency;
1248         p->inversion = c->inversion;
1249
1250         switch (dvbv3_type(c->delivery_system)) {
1251         case DVBV3_UNKNOWN:
1252                 dev_err(fe->dvb->device,
1253                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1254                         __func__, c->delivery_system);
1255                 return -EINVAL;
1256         case DVBV3_QPSK:
1257                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1258                 p->u.qpsk.symbol_rate = c->symbol_rate;
1259                 p->u.qpsk.fec_inner = c->fec_inner;
1260                 break;
1261         case DVBV3_QAM:
1262                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1263                 p->u.qam.symbol_rate = c->symbol_rate;
1264                 p->u.qam.fec_inner = c->fec_inner;
1265                 p->u.qam.modulation = c->modulation;
1266                 break;
1267         case DVBV3_OFDM:
1268                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1269                 switch (c->bandwidth_hz) {
1270                 case 10000000:
1271                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1272                         break;
1273                 case 8000000:
1274                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1275                         break;
1276                 case 7000000:
1277                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1278                         break;
1279                 case 6000000:
1280                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1281                         break;
1282                 case 5000000:
1283                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1284                         break;
1285                 case 1712000:
1286                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1287                         break;
1288                 case 0:
1289                 default:
1290                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1291                 }
1292                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1293                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1294                 p->u.ofdm.constellation = c->modulation;
1295                 p->u.ofdm.transmission_mode = c->transmission_mode;
1296                 p->u.ofdm.guard_interval = c->guard_interval;
1297                 p->u.ofdm.hierarchy_information = c->hierarchy;
1298                 break;
1299         case DVBV3_ATSC:
1300                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1301                 p->u.vsb.modulation = c->modulation;
1302                 break;
1303         }
1304         return 0;
1305 }
1306
1307 /**
1308  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1309  * @fe:         struct dvb_frontend pointer
1310  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1311  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1312  *
1313  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1314  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1315  * If p_out is not null, it will update the DVBv3 params pointed by it.
1316  */
1317 static int dtv_get_frontend(struct dvb_frontend *fe,
1318                             struct dtv_frontend_properties *c,
1319                             struct dvb_frontend_parameters *p_out)
1320 {
1321         int r;
1322
1323         if (fe->ops.get_frontend) {
1324                 r = fe->ops.get_frontend(fe, c);
1325                 if (unlikely(r < 0))
1326                         return r;
1327                 if (p_out)
1328                         dtv_property_legacy_params_sync(fe, c, p_out);
1329                 return 0;
1330         }
1331
1332         /* As everything is in cache, get_frontend fops are always supported */
1333         return 0;
1334 }
1335
1336 static int dvb_frontend_handle_ioctl(struct file *file,
1337                                      unsigned int cmd, void *parg);
1338
1339 static int dtv_property_process_get(struct dvb_frontend *fe,
1340                                     const struct dtv_frontend_properties *c,
1341                                     struct dtv_property *tvp,
1342                                     struct file *file)
1343 {
1344         int ncaps;
1345
1346         switch (tvp->cmd) {
1347         case DTV_ENUM_DELSYS:
1348                 ncaps = 0;
1349                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1350                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1351                         ncaps++;
1352                 }
1353                 tvp->u.buffer.len = ncaps;
1354                 break;
1355         case DTV_FREQUENCY:
1356                 tvp->u.data = c->frequency;
1357                 break;
1358         case DTV_MODULATION:
1359                 tvp->u.data = c->modulation;
1360                 break;
1361         case DTV_BANDWIDTH_HZ:
1362                 tvp->u.data = c->bandwidth_hz;
1363                 break;
1364         case DTV_INVERSION:
1365                 tvp->u.data = c->inversion;
1366                 break;
1367         case DTV_SYMBOL_RATE:
1368                 tvp->u.data = c->symbol_rate;
1369                 break;
1370         case DTV_INNER_FEC:
1371                 tvp->u.data = c->fec_inner;
1372                 break;
1373         case DTV_PILOT:
1374                 tvp->u.data = c->pilot;
1375                 break;
1376         case DTV_ROLLOFF:
1377                 tvp->u.data = c->rolloff;
1378                 break;
1379         case DTV_DELIVERY_SYSTEM:
1380                 tvp->u.data = c->delivery_system;
1381                 break;
1382         case DTV_VOLTAGE:
1383                 tvp->u.data = c->voltage;
1384                 break;
1385         case DTV_TONE:
1386                 tvp->u.data = c->sectone;
1387                 break;
1388         case DTV_API_VERSION:
1389                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1390                 break;
1391         case DTV_CODE_RATE_HP:
1392                 tvp->u.data = c->code_rate_HP;
1393                 break;
1394         case DTV_CODE_RATE_LP:
1395                 tvp->u.data = c->code_rate_LP;
1396                 break;
1397         case DTV_GUARD_INTERVAL:
1398                 tvp->u.data = c->guard_interval;
1399                 break;
1400         case DTV_TRANSMISSION_MODE:
1401                 tvp->u.data = c->transmission_mode;
1402                 break;
1403         case DTV_HIERARCHY:
1404                 tvp->u.data = c->hierarchy;
1405                 break;
1406         case DTV_INTERLEAVING:
1407                 tvp->u.data = c->interleaving;
1408                 break;
1409
1410         /* ISDB-T Support here */
1411         case DTV_ISDBT_PARTIAL_RECEPTION:
1412                 tvp->u.data = c->isdbt_partial_reception;
1413                 break;
1414         case DTV_ISDBT_SOUND_BROADCASTING:
1415                 tvp->u.data = c->isdbt_sb_mode;
1416                 break;
1417         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1418                 tvp->u.data = c->isdbt_sb_subchannel;
1419                 break;
1420         case DTV_ISDBT_SB_SEGMENT_IDX:
1421                 tvp->u.data = c->isdbt_sb_segment_idx;
1422                 break;
1423         case DTV_ISDBT_SB_SEGMENT_COUNT:
1424                 tvp->u.data = c->isdbt_sb_segment_count;
1425                 break;
1426         case DTV_ISDBT_LAYER_ENABLED:
1427                 tvp->u.data = c->isdbt_layer_enabled;
1428                 break;
1429         case DTV_ISDBT_LAYERA_FEC:
1430                 tvp->u.data = c->layer[0].fec;
1431                 break;
1432         case DTV_ISDBT_LAYERA_MODULATION:
1433                 tvp->u.data = c->layer[0].modulation;
1434                 break;
1435         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1436                 tvp->u.data = c->layer[0].segment_count;
1437                 break;
1438         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1439                 tvp->u.data = c->layer[0].interleaving;
1440                 break;
1441         case DTV_ISDBT_LAYERB_FEC:
1442                 tvp->u.data = c->layer[1].fec;
1443                 break;
1444         case DTV_ISDBT_LAYERB_MODULATION:
1445                 tvp->u.data = c->layer[1].modulation;
1446                 break;
1447         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1448                 tvp->u.data = c->layer[1].segment_count;
1449                 break;
1450         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1451                 tvp->u.data = c->layer[1].interleaving;
1452                 break;
1453         case DTV_ISDBT_LAYERC_FEC:
1454                 tvp->u.data = c->layer[2].fec;
1455                 break;
1456         case DTV_ISDBT_LAYERC_MODULATION:
1457                 tvp->u.data = c->layer[2].modulation;
1458                 break;
1459         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1460                 tvp->u.data = c->layer[2].segment_count;
1461                 break;
1462         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1463                 tvp->u.data = c->layer[2].interleaving;
1464                 break;
1465
1466         /* Multistream support */
1467         case DTV_STREAM_ID:
1468         case DTV_DVBT2_PLP_ID_LEGACY:
1469                 tvp->u.data = c->stream_id;
1470                 break;
1471
1472         /* Physical layer scrambling support */
1473         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1474                 tvp->u.data = c->scrambling_sequence_index;
1475                 break;
1476
1477         /* ATSC-MH */
1478         case DTV_ATSCMH_FIC_VER:
1479                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1480                 break;
1481         case DTV_ATSCMH_PARADE_ID:
1482                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1483                 break;
1484         case DTV_ATSCMH_NOG:
1485                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1486                 break;
1487         case DTV_ATSCMH_TNOG:
1488                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1489                 break;
1490         case DTV_ATSCMH_SGN:
1491                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1492                 break;
1493         case DTV_ATSCMH_PRC:
1494                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1495                 break;
1496         case DTV_ATSCMH_RS_FRAME_MODE:
1497                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1498                 break;
1499         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1500                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1501                 break;
1502         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1503                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1504                 break;
1505         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1506                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1507                 break;
1508         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1509                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1510                 break;
1511         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1512                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1513                 break;
1514         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1515                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1516                 break;
1517         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1518                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1519                 break;
1520         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1521                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1522                 break;
1523
1524         case DTV_LNA:
1525                 tvp->u.data = c->lna;
1526                 break;
1527
1528         /* Fill quality measures */
1529         case DTV_STAT_SIGNAL_STRENGTH:
1530                 tvp->u.st = c->strength;
1531                 break;
1532         case DTV_STAT_CNR:
1533                 tvp->u.st = c->cnr;
1534                 break;
1535         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1536                 tvp->u.st = c->pre_bit_error;
1537                 break;
1538         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1539                 tvp->u.st = c->pre_bit_count;
1540                 break;
1541         case DTV_STAT_POST_ERROR_BIT_COUNT:
1542                 tvp->u.st = c->post_bit_error;
1543                 break;
1544         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1545                 tvp->u.st = c->post_bit_count;
1546                 break;
1547         case DTV_STAT_ERROR_BLOCK_COUNT:
1548                 tvp->u.st = c->block_error;
1549                 break;
1550         case DTV_STAT_TOTAL_BLOCK_COUNT:
1551                 tvp->u.st = c->block_count;
1552                 break;
1553         default:
1554                 dev_dbg(fe->dvb->device,
1555                         "%s: FE property %d doesn't exist\n",
1556                         __func__, tvp->cmd);
1557                 return -EINVAL;
1558         }
1559
1560         if (!dtv_cmds[tvp->cmd].buffer)
1561                 dev_dbg(fe->dvb->device,
1562                         "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1563                         __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1564                         tvp->u.data);
1565         else
1566                 dev_dbg(fe->dvb->device,
1567                         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1568                         __func__,
1569                         tvp->cmd, dtv_cmds[tvp->cmd].name,
1570                         tvp->u.buffer.len,
1571                         tvp->u.buffer.len, tvp->u.buffer.data);
1572
1573         return 0;
1574 }
1575
1576 static int dtv_set_frontend(struct dvb_frontend *fe);
1577
1578 static bool is_dvbv3_delsys(u32 delsys)
1579 {
1580         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1581                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1582 }
1583
1584 /**
1585  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1586  * @fe:                 struct frontend;
1587  * @delsys:                     DVBv5 type that will be used for emulation
1588  *
1589  * Provides emulation for delivery systems that are compatible with the old
1590  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1591  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1592  * parameters are compatible with DVB-S spec.
1593  */
1594 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1595 {
1596         int i;
1597         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1598
1599         c->delivery_system = delsys;
1600
1601         /*
1602          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1603          */
1604         if (c->delivery_system == SYS_ISDBT) {
1605                 dev_dbg(fe->dvb->device,
1606                         "%s: Using defaults for SYS_ISDBT\n",
1607                         __func__);
1608
1609                 if (!c->bandwidth_hz)
1610                         c->bandwidth_hz = 6000000;
1611
1612                 c->isdbt_partial_reception = 0;
1613                 c->isdbt_sb_mode = 0;
1614                 c->isdbt_sb_subchannel = 0;
1615                 c->isdbt_sb_segment_idx = 0;
1616                 c->isdbt_sb_segment_count = 0;
1617                 c->isdbt_layer_enabled = 7;
1618                 for (i = 0; i < 3; i++) {
1619                         c->layer[i].fec = FEC_AUTO;
1620                         c->layer[i].modulation = QAM_AUTO;
1621                         c->layer[i].interleaving = 0;
1622                         c->layer[i].segment_count = 0;
1623                 }
1624         }
1625         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1626                 __func__, c->delivery_system);
1627
1628         return 0;
1629 }
1630
1631 /**
1632  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1633  * @fe:                 frontend struct
1634  * @desired_system:     delivery system requested by the user
1635  *
1636  * A DVBv5 call know what's the desired system it wants. So, set it.
1637  *
1638  * There are, however, a few known issues with early DVBv5 applications that
1639  * are also handled by this logic:
1640  *
1641  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1642  *    This is an API violation, but, as we don't want to break userspace,
1643  *    convert it to the first supported delivery system.
1644  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1645  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1646  *    ISDB-T provided backward compat with DVB-T.
1647  */
1648 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1649                                      u32 desired_system)
1650 {
1651         int ncaps;
1652         u32 delsys = SYS_UNDEFINED;
1653         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1654         enum dvbv3_emulation_type type;
1655
1656         /*
1657          * It was reported that some old DVBv5 applications were
1658          * filling delivery_system with SYS_UNDEFINED. If this happens,
1659          * assume that the application wants to use the first supported
1660          * delivery system.
1661          */
1662         if (desired_system == SYS_UNDEFINED)
1663                 desired_system = fe->ops.delsys[0];
1664
1665         /*
1666          * This is a DVBv5 call. So, it likely knows the supported
1667          * delivery systems. So, check if the desired delivery system is
1668          * supported
1669          */
1670         ncaps = 0;
1671         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1672                 if (fe->ops.delsys[ncaps] == desired_system) {
1673                         c->delivery_system = desired_system;
1674                         dev_dbg(fe->dvb->device,
1675                                 "%s: Changing delivery system to %d\n",
1676                                 __func__, desired_system);
1677                         return 0;
1678                 }
1679                 ncaps++;
1680         }
1681
1682         /*
1683          * The requested delivery system isn't supported. Maybe userspace
1684          * is requesting a DVBv3 compatible delivery system.
1685          *
1686          * The emulation only works if the desired system is one of the
1687          * delivery systems supported by DVBv3 API
1688          */
1689         if (!is_dvbv3_delsys(desired_system)) {
1690                 dev_dbg(fe->dvb->device,
1691                         "%s: Delivery system %d not supported.\n",
1692                         __func__, desired_system);
1693                 return -EINVAL;
1694         }
1695
1696         type = dvbv3_type(desired_system);
1697
1698         /*
1699         * Get the last non-DVBv3 delivery system that has the same type
1700         * of the desired system
1701         */
1702         ncaps = 0;
1703         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1704                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1705                         delsys = fe->ops.delsys[ncaps];
1706                 ncaps++;
1707         }
1708
1709         /* There's nothing compatible with the desired delivery system */
1710         if (delsys == SYS_UNDEFINED) {
1711                 dev_dbg(fe->dvb->device,
1712                         "%s: Delivery system %d not supported on emulation mode.\n",
1713                         __func__, desired_system);
1714                 return -EINVAL;
1715         }
1716
1717         dev_dbg(fe->dvb->device,
1718                 "%s: Using delivery system %d emulated as if it were %d\n",
1719                 __func__, delsys, desired_system);
1720
1721         return emulate_delivery_system(fe, desired_system);
1722 }
1723
1724 /**
1725  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1726  * @fe: frontend struct
1727  *
1728  * A DVBv3 call doesn't know what's the desired system it wants. It also
1729  * doesn't allow to switch between different types. Due to that, userspace
1730  * should use DVBv5 instead.
1731  * However, in order to avoid breaking userspace API, limited backward
1732  * compatibility support is provided.
1733  *
1734  * There are some delivery systems that are incompatible with DVBv3 calls.
1735  *
1736  * This routine should work fine for frontends that support just one delivery
1737  * system.
1738  *
1739  * For frontends that support multiple frontends:
1740  * 1) It defaults to use the first supported delivery system. There's an
1741  *    userspace application that allows changing it at runtime;
1742  *
1743  * 2) If the current delivery system is not compatible with DVBv3, it gets
1744  *    the first one that it is compatible.
1745  *
1746  * NOTE: in order for this to work with applications like Kaffeine that
1747  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1748  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1749  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1750  *      to DVB-S.
1751  */
1752 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1753 {
1754         int ncaps;
1755         u32 delsys = SYS_UNDEFINED;
1756         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1757
1758         /* If not set yet, defaults to the first supported delivery system */
1759         if (c->delivery_system == SYS_UNDEFINED)
1760                 c->delivery_system = fe->ops.delsys[0];
1761
1762         /*
1763          * Trivial case: just use the current one, if it already a DVBv3
1764          * delivery system
1765          */
1766         if (is_dvbv3_delsys(c->delivery_system)) {
1767                 dev_dbg(fe->dvb->device,
1768                         "%s: Using delivery system to %d\n",
1769                         __func__, c->delivery_system);
1770                 return 0;
1771         }
1772
1773         /*
1774          * Seek for the first delivery system that it is compatible with a
1775          * DVBv3 standard
1776          */
1777         ncaps = 0;
1778         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1779                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1780                         delsys = fe->ops.delsys[ncaps];
1781                         break;
1782                 }
1783                 ncaps++;
1784         }
1785         if (delsys == SYS_UNDEFINED) {
1786                 dev_dbg(fe->dvb->device,
1787                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1788                         __func__);
1789                 return -EINVAL;
1790         }
1791         return emulate_delivery_system(fe, delsys);
1792 }
1793
1794 /**
1795  * dtv_property_process_set -  Sets a single DTV property
1796  * @fe:         Pointer to &struct dvb_frontend
1797  * @file:       Pointer to &struct file
1798  * @cmd:        Digital TV command
1799  * @data:       An unsigned 32-bits number
1800  *
1801  * This routine assigns the property
1802  * value to the corresponding member of
1803  * &struct dtv_frontend_properties
1804  *
1805  * Returns:
1806  * Zero on success, negative errno on failure.
1807  */
1808 static int dtv_property_process_set(struct dvb_frontend *fe,
1809                                     struct file *file,
1810                                     u32 cmd, u32 data)
1811 {
1812         int r = 0;
1813         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1814
1815         /** Dump DTV command name and value*/
1816         if (!cmd || cmd > DTV_MAX_COMMAND)
1817                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1818                          __func__, cmd);
1819         else
1820                 dev_dbg(fe->dvb->device,
1821                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1822                         __func__, cmd, dtv_cmds[cmd].name, data);
1823         switch (cmd) {
1824         case DTV_CLEAR:
1825                 /*
1826                  * Reset a cache of data specific to the frontend here. This does
1827                  * not effect hardware.
1828                  */
1829                 dvb_frontend_clear_cache(fe);
1830                 break;
1831         case DTV_TUNE:
1832                 /*
1833                  * Use the cached Digital TV properties to tune the
1834                  * frontend
1835                  */
1836                 dev_dbg(fe->dvb->device,
1837                         "%s: Setting the frontend from property cache\n",
1838                         __func__);
1839
1840                 r = dtv_set_frontend(fe);
1841                 break;
1842         case DTV_FREQUENCY:
1843                 c->frequency = data;
1844                 break;
1845         case DTV_MODULATION:
1846                 c->modulation = data;
1847                 break;
1848         case DTV_BANDWIDTH_HZ:
1849                 c->bandwidth_hz = data;
1850                 break;
1851         case DTV_INVERSION:
1852                 c->inversion = data;
1853                 break;
1854         case DTV_SYMBOL_RATE:
1855                 c->symbol_rate = data;
1856                 break;
1857         case DTV_INNER_FEC:
1858                 c->fec_inner = data;
1859                 break;
1860         case DTV_PILOT:
1861                 c->pilot = data;
1862                 break;
1863         case DTV_ROLLOFF:
1864                 c->rolloff = data;
1865                 break;
1866         case DTV_DELIVERY_SYSTEM:
1867                 r = dvbv5_set_delivery_system(fe, data);
1868                 break;
1869         case DTV_VOLTAGE:
1870                 c->voltage = data;
1871                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1872                                               (void *)c->voltage);
1873                 break;
1874         case DTV_TONE:
1875                 c->sectone = data;
1876                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1877                                               (void *)c->sectone);
1878                 break;
1879         case DTV_CODE_RATE_HP:
1880                 c->code_rate_HP = data;
1881                 break;
1882         case DTV_CODE_RATE_LP:
1883                 c->code_rate_LP = data;
1884                 break;
1885         case DTV_GUARD_INTERVAL:
1886                 c->guard_interval = data;
1887                 break;
1888         case DTV_TRANSMISSION_MODE:
1889                 c->transmission_mode = data;
1890                 break;
1891         case DTV_HIERARCHY:
1892                 c->hierarchy = data;
1893                 break;
1894         case DTV_INTERLEAVING:
1895                 c->interleaving = data;
1896                 break;
1897
1898         /* ISDB-T Support here */
1899         case DTV_ISDBT_PARTIAL_RECEPTION:
1900                 c->isdbt_partial_reception = data;
1901                 break;
1902         case DTV_ISDBT_SOUND_BROADCASTING:
1903                 c->isdbt_sb_mode = data;
1904                 break;
1905         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1906                 c->isdbt_sb_subchannel = data;
1907                 break;
1908         case DTV_ISDBT_SB_SEGMENT_IDX:
1909                 c->isdbt_sb_segment_idx = data;
1910                 break;
1911         case DTV_ISDBT_SB_SEGMENT_COUNT:
1912                 c->isdbt_sb_segment_count = data;
1913                 break;
1914         case DTV_ISDBT_LAYER_ENABLED:
1915                 c->isdbt_layer_enabled = data;
1916                 break;
1917         case DTV_ISDBT_LAYERA_FEC:
1918                 c->layer[0].fec = data;
1919                 break;
1920         case DTV_ISDBT_LAYERA_MODULATION:
1921                 c->layer[0].modulation = data;
1922                 break;
1923         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1924                 c->layer[0].segment_count = data;
1925                 break;
1926         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1927                 c->layer[0].interleaving = data;
1928                 break;
1929         case DTV_ISDBT_LAYERB_FEC:
1930                 c->layer[1].fec = data;
1931                 break;
1932         case DTV_ISDBT_LAYERB_MODULATION:
1933                 c->layer[1].modulation = data;
1934                 break;
1935         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1936                 c->layer[1].segment_count = data;
1937                 break;
1938         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1939                 c->layer[1].interleaving = data;
1940                 break;
1941         case DTV_ISDBT_LAYERC_FEC:
1942                 c->layer[2].fec = data;
1943                 break;
1944         case DTV_ISDBT_LAYERC_MODULATION:
1945                 c->layer[2].modulation = data;
1946                 break;
1947         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1948                 c->layer[2].segment_count = data;
1949                 break;
1950         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1951                 c->layer[2].interleaving = data;
1952                 break;
1953
1954         /* Multistream support */
1955         case DTV_STREAM_ID:
1956         case DTV_DVBT2_PLP_ID_LEGACY:
1957                 c->stream_id = data;
1958                 break;
1959
1960         /* Physical layer scrambling support */
1961         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1962                 c->scrambling_sequence_index = data;
1963                 break;
1964
1965         /* ATSC-MH */
1966         case DTV_ATSCMH_PARADE_ID:
1967                 fe->dtv_property_cache.atscmh_parade_id = data;
1968                 break;
1969         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1970                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1971                 break;
1972
1973         case DTV_LNA:
1974                 c->lna = data;
1975                 if (fe->ops.set_lna)
1976                         r = fe->ops.set_lna(fe);
1977                 if (r < 0)
1978                         c->lna = LNA_AUTO;
1979                 break;
1980
1981         default:
1982                 return -EINVAL;
1983         }
1984
1985         return r;
1986 }
1987
1988 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
1989                                  void *parg)
1990 {
1991         struct dvb_device *dvbdev = file->private_data;
1992         struct dvb_frontend *fe = dvbdev->priv;
1993         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1994         int err;
1995
1996         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1997         if (down_interruptible(&fepriv->sem))
1998                 return -ERESTARTSYS;
1999
2000         if (fe->exit != DVB_FE_NO_EXIT) {
2001                 up(&fepriv->sem);
2002                 return -ENODEV;
2003         }
2004
2005         /*
2006          * If the frontend is opened in read-only mode, only the ioctls
2007          * that don't interfere with the tune logic should be accepted.
2008          * That allows an external application to monitor the DVB QoS and
2009          * statistics parameters.
2010          *
2011          * That matches all _IOR() ioctls, except for two special cases:
2012          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2013          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2014          *     setup
2015          * So, those two ioctls should also return -EPERM, as otherwise
2016          * reading from them would interfere with a DVB tune application
2017          */
2018         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2019             && (_IOC_DIR(cmd) != _IOC_READ
2020                 || cmd == FE_GET_EVENT
2021                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2022                 up(&fepriv->sem);
2023                 return -EPERM;
2024         }
2025
2026         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2027
2028         up(&fepriv->sem);
2029         return err;
2030 }
2031
2032 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2033                                unsigned long arg)
2034 {
2035         struct dvb_device *dvbdev = file->private_data;
2036
2037         if (!dvbdev)
2038                 return -ENODEV;
2039
2040         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2041 }
2042
2043 #ifdef CONFIG_COMPAT
2044 struct compat_dtv_property {
2045         __u32 cmd;
2046         __u32 reserved[3];
2047         union {
2048                 __u32 data;
2049                 struct dtv_fe_stats st;
2050                 struct {
2051                         __u8 data[32];
2052                         __u32 len;
2053                         __u32 reserved1[3];
2054                         compat_uptr_t reserved2;
2055                 } buffer;
2056         } u;
2057         int result;
2058 } __attribute__ ((packed));
2059
2060 struct compat_dtv_properties {
2061         __u32 num;
2062         compat_uptr_t props;
2063 };
2064
2065 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2066 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2067
2068 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2069                                             unsigned long arg)
2070 {
2071         struct dvb_device *dvbdev = file->private_data;
2072         struct dvb_frontend *fe = dvbdev->priv;
2073         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2074         int i, err = 0;
2075
2076         if (cmd == COMPAT_FE_SET_PROPERTY) {
2077                 struct compat_dtv_properties prop, *tvps = NULL;
2078                 struct compat_dtv_property *tvp = NULL;
2079
2080                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2081                         return -EFAULT;
2082
2083                 tvps = &prop;
2084
2085                 /*
2086                  * Put an arbitrary limit on the number of messages that can
2087                  * be sent at once
2088                  */
2089                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2090                         return -EINVAL;
2091
2092                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2093                 if (IS_ERR(tvp))
2094                         return PTR_ERR(tvp);
2095
2096                 for (i = 0; i < tvps->num; i++) {
2097                         err = dtv_property_process_set(fe, file,
2098                                                        (tvp + i)->cmd,
2099                                                        (tvp + i)->u.data);
2100                         if (err < 0) {
2101                                 kfree(tvp);
2102                                 return err;
2103                         }
2104                 }
2105                 kfree(tvp);
2106         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2107                 struct compat_dtv_properties prop, *tvps = NULL;
2108                 struct compat_dtv_property *tvp = NULL;
2109                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2110
2111                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2112                         return -EFAULT;
2113
2114                 tvps = &prop;
2115
2116                 /*
2117                  * Put an arbitrary limit on the number of messages that can
2118                  * be sent at once
2119                  */
2120                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2121                         return -EINVAL;
2122
2123                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2124                 if (IS_ERR(tvp))
2125                         return PTR_ERR(tvp);
2126
2127                 /*
2128                  * Let's use our own copy of property cache, in order to
2129                  * avoid mangling with DTV zigzag logic, as drivers might
2130                  * return crap, if they don't check if the data is available
2131                  * before updating the properties cache.
2132                  */
2133                 if (fepriv->state != FESTATE_IDLE) {
2134                         err = dtv_get_frontend(fe, &getp, NULL);
2135                         if (err < 0) {
2136                                 kfree(tvp);
2137                                 return err;
2138                         }
2139                 }
2140                 for (i = 0; i < tvps->num; i++) {
2141                         err = dtv_property_process_get(
2142                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2143                         if (err < 0) {
2144                                 kfree(tvp);
2145                                 return err;
2146                         }
2147                 }
2148
2149                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2150                                  tvps->num * sizeof(struct compat_dtv_property))) {
2151                         kfree(tvp);
2152                         return -EFAULT;
2153                 }
2154                 kfree(tvp);
2155         }
2156
2157         return err;
2158 }
2159
2160 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2161                                       unsigned long arg)
2162 {
2163         struct dvb_device *dvbdev = file->private_data;
2164         struct dvb_frontend *fe = dvbdev->priv;
2165         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2166         int err;
2167
2168         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2169                 if (down_interruptible(&fepriv->sem))
2170                         return -ERESTARTSYS;
2171
2172                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2173
2174                 up(&fepriv->sem);
2175                 return err;
2176         }
2177
2178         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2179 }
2180 #endif
2181
2182 static int dtv_set_frontend(struct dvb_frontend *fe)
2183 {
2184         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2185         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2186         struct dvb_frontend_tune_settings fetunesettings;
2187         u32 rolloff = 0;
2188
2189         if (dvb_frontend_check_parameters(fe) < 0)
2190                 return -EINVAL;
2191
2192         /*
2193          * Initialize output parameters to match the values given by
2194          * the user. FE_SET_FRONTEND triggers an initial frontend event
2195          * with status = 0, which copies output parameters to userspace.
2196          */
2197         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2198
2199         /*
2200          * Be sure that the bandwidth will be filled for all
2201          * non-satellite systems, as tuners need to know what
2202          * low pass/Nyquist half filter should be applied, in
2203          * order to avoid inter-channel noise.
2204          *
2205          * ISDB-T and DVB-T/T2 already sets bandwidth.
2206          * ATSC and DVB-C don't set, so, the core should fill it.
2207          *
2208          * On DVB-C Annex A and C, the bandwidth is a function of
2209          * the roll-off and symbol rate. Annex B defines different
2210          * roll-off factors depending on the modulation. Fortunately,
2211          * Annex B is only used with 6MHz, so there's no need to
2212          * calculate it.
2213          *
2214          * While not officially supported, a side effect of handling it at
2215          * the cache level is that a program could retrieve the bandwidth
2216          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2217          */
2218         switch (c->delivery_system) {
2219         case SYS_ATSC:
2220         case SYS_DVBC_ANNEX_B:
2221                 c->bandwidth_hz = 6000000;
2222                 break;
2223         case SYS_DVBC_ANNEX_A:
2224                 rolloff = 115;
2225                 break;
2226         case SYS_DVBC_ANNEX_C:
2227                 rolloff = 113;
2228                 break;
2229         case SYS_DVBS:
2230         case SYS_TURBO:
2231         case SYS_ISDBS:
2232                 rolloff = 135;
2233                 break;
2234         case SYS_DVBS2:
2235                 switch (c->rolloff) {
2236                 case ROLLOFF_20:
2237                         rolloff = 120;
2238                         break;
2239                 case ROLLOFF_25:
2240                         rolloff = 125;
2241                         break;
2242                 default:
2243                 case ROLLOFF_35:
2244                         rolloff = 135;
2245                 }
2246                 break;
2247         default:
2248                 break;
2249         }
2250         if (rolloff)
2251                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2252
2253         /* force auto frequency inversion if requested */
2254         if (dvb_force_auto_inversion)
2255                 c->inversion = INVERSION_AUTO;
2256
2257         /*
2258          * without hierarchical coding code_rate_LP is irrelevant,
2259          * so we tolerate the otherwise invalid FEC_NONE setting
2260          */
2261         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2262                 c->code_rate_LP = FEC_AUTO;
2263
2264         /* get frontend-specific tuning settings */
2265         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2266         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2267                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2268                 fepriv->max_drift = fetunesettings.max_drift;
2269                 fepriv->step_size = fetunesettings.step_size;
2270         } else {
2271                 /* default values */
2272                 switch (c->delivery_system) {
2273                 case SYS_DVBS:
2274                 case SYS_DVBS2:
2275                 case SYS_ISDBS:
2276                 case SYS_TURBO:
2277                 case SYS_DVBC_ANNEX_A:
2278                 case SYS_DVBC_ANNEX_C:
2279                         fepriv->min_delay = HZ / 20;
2280                         fepriv->step_size = c->symbol_rate / 16000;
2281                         fepriv->max_drift = c->symbol_rate / 2000;
2282                         break;
2283                 case SYS_DVBT:
2284                 case SYS_DVBT2:
2285                 case SYS_ISDBT:
2286                 case SYS_DTMB:
2287                         fepriv->min_delay = HZ / 20;
2288                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
2289                         fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
2290                         break;
2291                 default:
2292                         /*
2293                          * FIXME: This sounds wrong! if freqency_stepsize is
2294                          * defined by the frontend, why not use it???
2295                          */
2296                         fepriv->min_delay = HZ / 20;
2297                         fepriv->step_size = 0; /* no zigzag */
2298                         fepriv->max_drift = 0;
2299                         break;
2300                 }
2301         }
2302         if (dvb_override_tune_delay > 0)
2303                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2304
2305         fepriv->state = FESTATE_RETUNE;
2306
2307         /* Request the search algorithm to search */
2308         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2309
2310         dvb_frontend_clear_events(fe);
2311         dvb_frontend_add_event(fe, 0);
2312         dvb_frontend_wakeup(fe);
2313         fepriv->status = 0;
2314
2315         return 0;
2316 }
2317
2318 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2319                             struct dtv_properties *tvps)
2320 {
2321         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2322         struct dtv_property *tvp = NULL;
2323         struct dtv_frontend_properties getp;
2324         int i, err;
2325
2326         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2327
2328         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2329                 __func__, tvps->num);
2330         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2331                 __func__, tvps->props);
2332
2333         /*
2334          * Put an arbitrary limit on the number of messages that can
2335          * be sent at once
2336          */
2337         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2338                 return -EINVAL;
2339
2340         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2341         if (IS_ERR(tvp))
2342                 return PTR_ERR(tvp);
2343
2344         /*
2345          * Let's use our own copy of property cache, in order to
2346          * avoid mangling with DTV zigzag logic, as drivers might
2347          * return crap, if they don't check if the data is available
2348          * before updating the properties cache.
2349          */
2350         if (fepriv->state != FESTATE_IDLE) {
2351                 err = dtv_get_frontend(fe, &getp, NULL);
2352                 if (err < 0)
2353                         goto out;
2354         }
2355         for (i = 0; i < tvps->num; i++) {
2356                 err = dtv_property_process_get(fe, &getp,
2357                                                tvp + i, file);
2358                 if (err < 0)
2359                         goto out;
2360         }
2361
2362         if (copy_to_user((void __user *)tvps->props, tvp,
2363                          tvps->num * sizeof(struct dtv_property))) {
2364                 err = -EFAULT;
2365                 goto out;
2366         }
2367
2368         err = 0;
2369 out:
2370         kfree(tvp);
2371         return err;
2372 }
2373
2374 static int dvb_get_frontend(struct dvb_frontend *fe,
2375                             struct dvb_frontend_parameters *p_out)
2376 {
2377         struct dtv_frontend_properties getp;
2378
2379         /*
2380          * Let's use our own copy of property cache, in order to
2381          * avoid mangling with DTV zigzag logic, as drivers might
2382          * return crap, if they don't check if the data is available
2383          * before updating the properties cache.
2384          */
2385         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2386
2387         return dtv_get_frontend(fe, &getp, p_out);
2388 }
2389
2390 static int dvb_frontend_handle_ioctl(struct file *file,
2391                                      unsigned int cmd, void *parg)
2392 {
2393         struct dvb_device *dvbdev = file->private_data;
2394         struct dvb_frontend *fe = dvbdev->priv;
2395         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2396         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2397         int i, err = -ENOTSUPP;
2398
2399         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2400
2401         switch (cmd) {
2402         case FE_SET_PROPERTY: {
2403                 struct dtv_properties *tvps = parg;
2404                 struct dtv_property *tvp = NULL;
2405
2406                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2407                         __func__, tvps->num);
2408                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2409                         __func__, tvps->props);
2410
2411                 /*
2412                  * Put an arbitrary limit on the number of messages that can
2413                  * be sent at once
2414                  */
2415                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2416                         return -EINVAL;
2417
2418                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2419                 if (IS_ERR(tvp))
2420                         return PTR_ERR(tvp);
2421
2422                 for (i = 0; i < tvps->num; i++) {
2423                         err = dtv_property_process_set(fe, file,
2424                                                        (tvp + i)->cmd,
2425                                                        (tvp + i)->u.data);
2426                         if (err < 0) {
2427                                 kfree(tvp);
2428                                 return err;
2429                         }
2430                 }
2431                 kfree(tvp);
2432                 err = 0;
2433                 break;
2434         }
2435         case FE_GET_PROPERTY:
2436                 err = dvb_get_property(fe, file, parg);
2437                 break;
2438
2439         case FE_GET_INFO: {
2440                 struct dvb_frontend_info *info = parg;
2441                 memset(info, 0, sizeof(*info));
2442
2443                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2444                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2445                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2446                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2447                 info->caps = fe->ops.info.caps;
2448                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2449                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2450                                                   &info->frequency_max,
2451                                                   &info->frequency_tolerance);
2452
2453                 /*
2454                  * Associate the 4 delivery systems supported by DVBv3
2455                  * API with their DVBv5 counterpart. For the other standards,
2456                  * use the closest type, assuming that it would hopefully
2457                  * work with a DVBv3 application.
2458                  * It should be noticed that, on multi-frontend devices with
2459                  * different types (terrestrial and cable, for example),
2460                  * a pure DVBv3 application won't be able to use all delivery
2461                  * systems. Yet, changing the DVBv5 cache to the other delivery
2462                  * system should be enough for making it work.
2463                  */
2464                 switch (dvbv3_type(c->delivery_system)) {
2465                 case DVBV3_QPSK:
2466                         info->type = FE_QPSK;
2467                         break;
2468                 case DVBV3_ATSC:
2469                         info->type = FE_ATSC;
2470                         break;
2471                 case DVBV3_QAM:
2472                         info->type = FE_QAM;
2473                         break;
2474                 case DVBV3_OFDM:
2475                         info->type = FE_OFDM;
2476                         break;
2477                 default:
2478                         dev_err(fe->dvb->device,
2479                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2480                                 __func__, c->delivery_system);
2481                         info->type = FE_OFDM;
2482                 }
2483                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2484                         __func__, c->delivery_system, info->type);
2485
2486                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2487                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2488                         info->caps |= FE_CAN_INVERSION_AUTO;
2489                 err = 0;
2490                 break;
2491         }
2492
2493         case FE_READ_STATUS: {
2494                 enum fe_status *status = parg;
2495
2496                 /* if retune was requested but hasn't occurred yet, prevent
2497                  * that user get signal state from previous tuning */
2498                 if (fepriv->state == FESTATE_RETUNE ||
2499                     fepriv->state == FESTATE_ERROR) {
2500                         err = 0;
2501                         *status = 0;
2502                         break;
2503                 }
2504
2505                 if (fe->ops.read_status)
2506                         err = fe->ops.read_status(fe, status);
2507                 break;
2508         }
2509
2510         case FE_DISEQC_RESET_OVERLOAD:
2511                 if (fe->ops.diseqc_reset_overload) {
2512                         err = fe->ops.diseqc_reset_overload(fe);
2513                         fepriv->state = FESTATE_DISEQC;
2514                         fepriv->status = 0;
2515                 }
2516                 break;
2517
2518         case FE_DISEQC_SEND_MASTER_CMD:
2519                 if (fe->ops.diseqc_send_master_cmd) {
2520                         struct dvb_diseqc_master_cmd *cmd = parg;
2521
2522                         if (cmd->msg_len > sizeof(cmd->msg)) {
2523                                 err = -EINVAL;
2524                                 break;
2525                         }
2526                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2527                         fepriv->state = FESTATE_DISEQC;
2528                         fepriv->status = 0;
2529                 }
2530                 break;
2531
2532         case FE_DISEQC_SEND_BURST:
2533                 if (fe->ops.diseqc_send_burst) {
2534                         err = fe->ops.diseqc_send_burst(fe,
2535                                                 (enum fe_sec_mini_cmd)parg);
2536                         fepriv->state = FESTATE_DISEQC;
2537                         fepriv->status = 0;
2538                 }
2539                 break;
2540
2541         case FE_SET_TONE:
2542                 if (fe->ops.set_tone) {
2543                         err = fe->ops.set_tone(fe,
2544                                                (enum fe_sec_tone_mode)parg);
2545                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2546                         fepriv->state = FESTATE_DISEQC;
2547                         fepriv->status = 0;
2548                 }
2549                 break;
2550
2551         case FE_SET_VOLTAGE:
2552                 if (fe->ops.set_voltage) {
2553                         err = fe->ops.set_voltage(fe,
2554                                                   (enum fe_sec_voltage)parg);
2555                         fepriv->voltage = (enum fe_sec_voltage)parg;
2556                         fepriv->state = FESTATE_DISEQC;
2557                         fepriv->status = 0;
2558                 }
2559                 break;
2560
2561         case FE_DISEQC_RECV_SLAVE_REPLY:
2562                 if (fe->ops.diseqc_recv_slave_reply)
2563                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2564                 break;
2565
2566         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2567                 if (fe->ops.enable_high_lnb_voltage)
2568                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2569                 break;
2570
2571         case FE_SET_FRONTEND_TUNE_MODE:
2572                 fepriv->tune_mode_flags = (unsigned long)parg;
2573                 err = 0;
2574                 break;
2575         /* DEPRECATED dish control ioctls */
2576
2577         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2578                 if (fe->ops.dishnetwork_send_legacy_command) {
2579                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2580                                                          (unsigned long)parg);
2581                         fepriv->state = FESTATE_DISEQC;
2582                         fepriv->status = 0;
2583                 } else if (fe->ops.set_voltage) {
2584                         /*
2585                          * NOTE: This is a fallback condition.  Some frontends
2586                          * (stv0299 for instance) take longer than 8msec to
2587                          * respond to a set_voltage command.  Those switches
2588                          * need custom routines to switch properly.  For all
2589                          * other frontends, the following should work ok.
2590                          * Dish network legacy switches (as used by Dish500)
2591                          * are controlled by sending 9-bit command words
2592                          * spaced 8msec apart.
2593                          * the actual command word is switch/port dependent
2594                          * so it is up to the userspace application to send
2595                          * the right command.
2596                          * The command must always start with a '0' after
2597                          * initialization, so parg is 8 bits and does not
2598                          * include the initialization or start bit
2599                          */
2600                         unsigned long swcmd = ((unsigned long)parg) << 1;
2601                         ktime_t nexttime;
2602                         ktime_t tv[10];
2603                         int i;
2604                         u8 last = 1;
2605
2606                         if (dvb_frontend_debug)
2607                                 dprintk("switch command: 0x%04lx\n",
2608                                         swcmd);
2609                         nexttime = ktime_get_boottime();
2610                         if (dvb_frontend_debug)
2611                                 tv[0] = nexttime;
2612                         /* before sending a command, initialize by sending
2613                          * a 32ms 18V to the switch
2614                          */
2615                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2616                         dvb_frontend_sleep_until(&nexttime, 32000);
2617
2618                         for (i = 0; i < 9; i++) {
2619                                 if (dvb_frontend_debug)
2620                                         tv[i + 1] = ktime_get_boottime();
2621                                 if ((swcmd & 0x01) != last) {
2622                                         /* set voltage to (last ? 13V : 18V) */
2623                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2624                                         last = (last) ? 0 : 1;
2625                                 }
2626                                 swcmd = swcmd >> 1;
2627                                 if (i != 8)
2628                                         dvb_frontend_sleep_until(&nexttime, 8000);
2629                         }
2630                         if (dvb_frontend_debug) {
2631                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2632                                         fe->dvb->num);
2633                                 for (i = 1; i < 10; i++)
2634                                         pr_info("%d: %d\n", i,
2635                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2636                         }
2637                         err = 0;
2638                         fepriv->state = FESTATE_DISEQC;
2639                         fepriv->status = 0;
2640                 }
2641                 break;
2642
2643         /* DEPRECATED statistics ioctls */
2644
2645         case FE_READ_BER:
2646                 if (fe->ops.read_ber) {
2647                         if (fepriv->thread)
2648                                 err = fe->ops.read_ber(fe, parg);
2649                         else
2650                                 err = -EAGAIN;
2651                 }
2652                 break;
2653
2654         case FE_READ_SIGNAL_STRENGTH:
2655                 if (fe->ops.read_signal_strength) {
2656                         if (fepriv->thread)
2657                                 err = fe->ops.read_signal_strength(fe, parg);
2658                         else
2659                                 err = -EAGAIN;
2660                 }
2661                 break;
2662
2663         case FE_READ_SNR:
2664                 if (fe->ops.read_snr) {
2665                         if (fepriv->thread)
2666                                 err = fe->ops.read_snr(fe, parg);
2667                         else
2668                                 err = -EAGAIN;
2669                 }
2670                 break;
2671
2672         case FE_READ_UNCORRECTED_BLOCKS:
2673                 if (fe->ops.read_ucblocks) {
2674                         if (fepriv->thread)
2675                                 err = fe->ops.read_ucblocks(fe, parg);
2676                         else
2677                                 err = -EAGAIN;
2678                 }
2679                 break;
2680
2681         /* DEPRECATED DVBv3 ioctls */
2682
2683         case FE_SET_FRONTEND:
2684                 err = dvbv3_set_delivery_system(fe);
2685                 if (err)
2686                         break;
2687
2688                 err = dtv_property_cache_sync(fe, c, parg);
2689                 if (err)
2690                         break;
2691                 err = dtv_set_frontend(fe);
2692                 break;
2693
2694         case FE_GET_EVENT:
2695                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2696                 break;
2697
2698         case FE_GET_FRONTEND:
2699                 err = dvb_get_frontend(fe, parg);
2700                 break;
2701
2702         default:
2703                 return -ENOTSUPP;
2704         } /* switch */
2705
2706         return err;
2707 }
2708
2709 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2710 {
2711         struct dvb_device *dvbdev = file->private_data;
2712         struct dvb_frontend *fe = dvbdev->priv;
2713         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2714
2715         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2716
2717         poll_wait(file, &fepriv->events.wait_queue, wait);
2718
2719         if (fepriv->events.eventw != fepriv->events.eventr)
2720                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2721
2722         return 0;
2723 }
2724
2725 static int dvb_frontend_open(struct inode *inode, struct file *file)
2726 {
2727         struct dvb_device *dvbdev = file->private_data;
2728         struct dvb_frontend *fe = dvbdev->priv;
2729         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2730         struct dvb_adapter *adapter = fe->dvb;
2731         int ret;
2732
2733         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2734         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2735                 return -ENODEV;
2736
2737         if (adapter->mfe_shared) {
2738                 mutex_lock(&adapter->mfe_lock);
2739
2740                 if (!adapter->mfe_dvbdev)
2741                         adapter->mfe_dvbdev = dvbdev;
2742
2743                 else if (adapter->mfe_dvbdev != dvbdev) {
2744                         struct dvb_device
2745                                 *mfedev = adapter->mfe_dvbdev;
2746                         struct dvb_frontend
2747                                 *mfe = mfedev->priv;
2748                         struct dvb_frontend_private
2749                                 *mfepriv = mfe->frontend_priv;
2750                         int mferetry = (dvb_mfe_wait_time << 1);
2751
2752                         mutex_unlock(&adapter->mfe_lock);
2753                         while (mferetry-- && (mfedev->users != -1 ||
2754                                               mfepriv->thread)) {
2755                                 if (msleep_interruptible(500)) {
2756                                         if (signal_pending(current))
2757                                                 return -EINTR;
2758                                 }
2759                         }
2760
2761                         mutex_lock(&adapter->mfe_lock);
2762                         if (adapter->mfe_dvbdev != dvbdev) {
2763                                 mfedev = adapter->mfe_dvbdev;
2764                                 mfe = mfedev->priv;
2765                                 mfepriv = mfe->frontend_priv;
2766                                 if (mfedev->users != -1 ||
2767                                     mfepriv->thread) {
2768                                         mutex_unlock(&adapter->mfe_lock);
2769                                         return -EBUSY;
2770                                 }
2771                                 adapter->mfe_dvbdev = dvbdev;
2772                         }
2773                 }
2774         }
2775
2776         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2777                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2778                         goto err0;
2779
2780                 /* If we took control of the bus, we need to force
2781                    reinitialization.  This is because many ts_bus_ctrl()
2782                    functions strobe the RESET pin on the demod, and if the
2783                    frontend thread already exists then the dvb_init() routine
2784                    won't get called (which is what usually does initial
2785                    register configuration). */
2786                 fepriv->reinitialise = 1;
2787         }
2788
2789         if ((ret = dvb_generic_open(inode, file)) < 0)
2790                 goto err1;
2791
2792         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2793                 /* normal tune mode when opened R/W */
2794                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2795                 fepriv->tone = -1;
2796                 fepriv->voltage = -1;
2797
2798 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2799                 mutex_lock(&fe->dvb->mdev_lock);
2800                 if (fe->dvb->mdev) {
2801                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2802                         if (fe->dvb->mdev->enable_source)
2803                                 ret = fe->dvb->mdev->enable_source(
2804                                                            dvbdev->entity,
2805                                                            &fepriv->pipe);
2806                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2807                         if (ret) {
2808                                 mutex_unlock(&fe->dvb->mdev_lock);
2809                                 dev_err(fe->dvb->device,
2810                                         "Tuner is busy. Error %d\n", ret);
2811                                 goto err2;
2812                         }
2813                 }
2814                 mutex_unlock(&fe->dvb->mdev_lock);
2815 #endif
2816                 ret = dvb_frontend_start(fe);
2817                 if (ret)
2818                         goto err3;
2819
2820                 /*  empty event queue */
2821                 fepriv->events.eventr = fepriv->events.eventw = 0;
2822         }
2823
2824         dvb_frontend_get(fe);
2825
2826         if (adapter->mfe_shared)
2827                 mutex_unlock(&adapter->mfe_lock);
2828         return ret;
2829
2830 err3:
2831 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2832         mutex_lock(&fe->dvb->mdev_lock);
2833         if (fe->dvb->mdev) {
2834                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2835                 if (fe->dvb->mdev->disable_source)
2836                         fe->dvb->mdev->disable_source(dvbdev->entity);
2837                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2838         }
2839         mutex_unlock(&fe->dvb->mdev_lock);
2840 err2:
2841 #endif
2842         dvb_generic_release(inode, file);
2843 err1:
2844         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2845                 fe->ops.ts_bus_ctrl(fe, 0);
2846 err0:
2847         if (adapter->mfe_shared)
2848                 mutex_unlock(&adapter->mfe_lock);
2849         return ret;
2850 }
2851
2852 static int dvb_frontend_release(struct inode *inode, struct file *file)
2853 {
2854         struct dvb_device *dvbdev = file->private_data;
2855         struct dvb_frontend *fe = dvbdev->priv;
2856         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2857         int ret;
2858
2859         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2860
2861         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2862                 fepriv->release_jiffies = jiffies;
2863                 mb();
2864         }
2865
2866         ret = dvb_generic_release(inode, file);
2867
2868         if (dvbdev->users == -1) {
2869                 wake_up(&fepriv->wait_queue);
2870 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2871                 mutex_lock(&fe->dvb->mdev_lock);
2872                 if (fe->dvb->mdev) {
2873                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2874                         if (fe->dvb->mdev->disable_source)
2875                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2876                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2877                 }
2878                 mutex_unlock(&fe->dvb->mdev_lock);
2879 #endif
2880                 if (fe->exit != DVB_FE_NO_EXIT)
2881                         wake_up(&dvbdev->wait_queue);
2882                 if (fe->ops.ts_bus_ctrl)
2883                         fe->ops.ts_bus_ctrl(fe, 0);
2884         }
2885
2886         dvb_frontend_put(fe);
2887
2888         return ret;
2889 }
2890
2891 static const struct file_operations dvb_frontend_fops = {
2892         .owner          = THIS_MODULE,
2893         .unlocked_ioctl = dvb_frontend_ioctl,
2894 #ifdef CONFIG_COMPAT
2895         .compat_ioctl   = dvb_frontend_compat_ioctl,
2896 #endif
2897         .poll           = dvb_frontend_poll,
2898         .open           = dvb_frontend_open,
2899         .release        = dvb_frontend_release,
2900         .llseek         = noop_llseek,
2901 };
2902
2903 int dvb_frontend_suspend(struct dvb_frontend *fe)
2904 {
2905         int ret = 0;
2906
2907         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2908                 fe->id);
2909
2910         if (fe->ops.tuner_ops.suspend)
2911                 ret = fe->ops.tuner_ops.suspend(fe);
2912         else if (fe->ops.tuner_ops.sleep)
2913                 ret = fe->ops.tuner_ops.sleep(fe);
2914
2915         if (fe->ops.sleep)
2916                 ret = fe->ops.sleep(fe);
2917
2918         return ret;
2919 }
2920 EXPORT_SYMBOL(dvb_frontend_suspend);
2921
2922 int dvb_frontend_resume(struct dvb_frontend *fe)
2923 {
2924         struct dvb_frontend_private *fepriv = fe->frontend_priv;
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         fe->exit = DVB_FE_DEVICE_RESUME;
2931         if (fe->ops.init)
2932                 ret = fe->ops.init(fe);
2933
2934         if (fe->ops.tuner_ops.resume)
2935                 ret = fe->ops.tuner_ops.resume(fe);
2936         else if (fe->ops.tuner_ops.init)
2937                 ret = fe->ops.tuner_ops.init(fe);
2938
2939         if (fe->ops.set_tone && fepriv->tone != -1)
2940                 fe->ops.set_tone(fe, fepriv->tone);
2941         if (fe->ops.set_voltage && fepriv->voltage != -1)
2942                 fe->ops.set_voltage(fe, fepriv->voltage);
2943
2944         fe->exit = DVB_FE_NO_EXIT;
2945         fepriv->state = FESTATE_RETUNE;
2946         dvb_frontend_wakeup(fe);
2947
2948         return ret;
2949 }
2950 EXPORT_SYMBOL(dvb_frontend_resume);
2951
2952 int dvb_register_frontend(struct dvb_adapter *dvb,
2953                           struct dvb_frontend *fe)
2954 {
2955         struct dvb_frontend_private *fepriv;
2956         const struct dvb_device dvbdev_template = {
2957                 .users = ~0,
2958                 .writers = 1,
2959                 .readers = (~0) - 1,
2960                 .fops = &dvb_frontend_fops,
2961 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2962                 .name = fe->ops.info.name,
2963 #endif
2964         };
2965
2966         dev_dbg(dvb->device, "%s:\n", __func__);
2967
2968         if (mutex_lock_interruptible(&frontend_mutex))
2969                 return -ERESTARTSYS;
2970
2971         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2972         if (!fe->frontend_priv) {
2973                 mutex_unlock(&frontend_mutex);
2974                 return -ENOMEM;
2975         }
2976         fepriv = fe->frontend_priv;
2977
2978         kref_init(&fe->refcount);
2979
2980         /*
2981          * After initialization, there need to be two references: one
2982          * for dvb_unregister_frontend(), and another one for
2983          * dvb_frontend_detach().
2984          */
2985         dvb_frontend_get(fe);
2986
2987         sema_init(&fepriv->sem, 1);
2988         init_waitqueue_head(&fepriv->wait_queue);
2989         init_waitqueue_head(&fepriv->events.wait_queue);
2990         mutex_init(&fepriv->events.mtx);
2991         fe->dvb = dvb;
2992         fepriv->inversion = INVERSION_OFF;
2993
2994         dev_info(fe->dvb->device,
2995                  "DVB: registering adapter %i frontend %i (%s)...\n",
2996                  fe->dvb->num, fe->id, fe->ops.info.name);
2997
2998         dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2999                             fe, DVB_DEVICE_FRONTEND, 0);
3000
3001         /*
3002          * Initialize the cache to the proper values according with the
3003          * first supported delivery system (ops->delsys[0])
3004          */
3005
3006         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3007         dvb_frontend_clear_cache(fe);
3008
3009         mutex_unlock(&frontend_mutex);
3010         return 0;
3011 }
3012 EXPORT_SYMBOL(dvb_register_frontend);
3013
3014 int dvb_unregister_frontend(struct dvb_frontend *fe)
3015 {
3016         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3017
3018         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3019
3020         mutex_lock(&frontend_mutex);
3021         dvb_frontend_stop(fe);
3022         dvb_remove_device(fepriv->dvbdev);
3023
3024         /* fe is invalid now */
3025         mutex_unlock(&frontend_mutex);
3026         dvb_frontend_put(fe);
3027         return 0;
3028 }
3029 EXPORT_SYMBOL(dvb_unregister_frontend);
3030
3031 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3032                                         void (*release)(struct dvb_frontend *fe))
3033 {
3034         if (release) {
3035                 release(fe);
3036 #ifdef CONFIG_MEDIA_ATTACH
3037                 dvb_detach(release);
3038 #endif
3039         }
3040 }
3041
3042 void dvb_frontend_detach(struct dvb_frontend *fe)
3043 {
3044         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3045         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3046         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3047         dvb_frontend_put(fe);
3048 }
3049 EXPORT_SYMBOL(dvb_frontend_detach);