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