root/drivers/media/dvb-core/dvb_frontend.c

DEFINITIONS

1. __dvb_frontend_free
2. dvb_frontend_free
3. dvb_frontend_put
4. dvb_frontend_get
5. has_get_frontend
6. dvbv3_type
7. dvb_frontend_add_event
8. dvb_frontend_test_event
9. dvb_frontend_get_event
10. dvb_frontend_clear_events
11. dvb_frontend_init
12. dvb_frontend_reinitialise
13. dvb_frontend_swzigzag_update_delay
14. dvb_frontend_swzigzag_autotune
15. dvb_frontend_swzigzag
16. dvb_frontend_is_exiting
17. dvb_frontend_should_wakeup
18. dvb_frontend_wakeup
19. dvb_frontend_thread
20. dvb_frontend_stop
21. dvb_frontend_sleep_until
22. dvb_frontend_start
23. dvb_frontend_get_frequency_limits
24. dvb_frontend_get_stepsize
25. dvb_frontend_check_parameters
26. dvb_frontend_clear_cache
27. dtv_property_cache_sync
28. dtv_property_legacy_params_sync
29. dtv_get_frontend
30. dtv_property_process_get
31. is_dvbv3_delsys
32. emulate_delivery_system
33. dvbv5_set_delivery_system
34. dvbv3_set_delivery_system
35. dtv_property_process_set
36. dvb_frontend_do_ioctl
37. dvb_frontend_ioctl
38. dvb_frontend_compat_ioctl
39. dtv_set_frontend
40. dvb_get_property
41. dvb_get_frontend
42. dvb_frontend_handle_ioctl
43. dvb_frontend_poll
44. dvb_frontend_open
45. dvb_frontend_release
46. dvb_frontend_suspend
47. dvb_frontend_resume
48. dvb_register_frontend
49. dvb_unregister_frontend
50. dvb_frontend_invoke_release
51. dvb_frontend_detach

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dvb_frontend.c: DVB frontend tuning interface/thread
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  */
  12 
  13 /* Enables DVBv3 compatibility bits at the headers */
  14 #define __DVB_CORE__
  15 
  16 #define pr_fmt(fmt) "dvb_frontend: " fmt
  17 
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/wait.h>
  22 #include <linux/slab.h>
  23 #include <linux/poll.h>
  24 #include <linux/semaphore.h>
  25 #include <linux/module.h>
  26 #include <linux/list.h>
  27 #include <linux/freezer.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kthread.h>
  30 #include <linux/ktime.h>
  31 #include <linux/compat.h>
  32 #include <asm/processor.h>
  33 
  34 #include <media/dvb_frontend.h>
  35 #include <media/dvbdev.h>
  36 #include <linux/dvb/version.h>
  37 
  38 static int dvb_frontend_debug;
  39 static int dvb_shutdown_timeout;
  40 static int dvb_force_auto_inversion;
  41 static int dvb_override_tune_delay;
  42 static int dvb_powerdown_on_sleep = 1;
  43 static int dvb_mfe_wait_time = 5;
  44 
  45 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  46 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  47 module_param(dvb_shutdown_timeout, int, 0644);
  48 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  49 module_param(dvb_force_auto_inversion, int, 0644);
  50 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  51 module_param(dvb_override_tune_delay, int, 0644);
  52 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  53 module_param(dvb_powerdown_on_sleep, int, 0644);
  54 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  55 module_param(dvb_mfe_wait_time, int, 0644);
  56 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  57 
  58 #define dprintk(fmt, arg...) \
  59         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  60 
  61 #define FESTATE_IDLE 1
  62 #define FESTATE_RETUNE 2
  63 #define FESTATE_TUNING_FAST 4
  64 #define FESTATE_TUNING_SLOW 8
  65 #define FESTATE_TUNED 16
  66 #define FESTATE_ZIGZAG_FAST 32
  67 #define FESTATE_ZIGZAG_SLOW 64
  68 #define FESTATE_DISEQC 128
  69 #define FESTATE_ERROR 256
  70 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  71 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  72 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  73 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  74 
  75 /*
  76  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  77  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  78  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  79  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  80  * FESTATE_TUNED. The frontend has successfully locked on.
  81  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  82  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  83  * FESTATE_DISEQC. A DISEQC command has just been issued.
  84  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  85  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  86  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  87  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  88  */
  89 
  90 static DEFINE_MUTEX(frontend_mutex);
  91 
  92 struct dvb_frontend_private {
  93         /* thread/frontend values */
  94         struct dvb_device *dvbdev;
  95         struct dvb_frontend_parameters parameters_out;
  96         struct dvb_fe_events events;
  97         struct semaphore sem;
  98         struct list_head list_head;
  99         wait_queue_head_t wait_queue;
 100         struct task_struct *thread;
 101         unsigned long release_jiffies;
 102         unsigned int wakeup;
 103         enum fe_status status;
 104         unsigned long tune_mode_flags;
 105         unsigned int delay;
 106         unsigned int reinitialise;
 107         int tone;
 108         int voltage;
 109 
 110         /* swzigzag values */
 111         unsigned int state;
 112         unsigned int bending;
 113         int lnb_drift;
 114         unsigned int inversion;
 115         unsigned int auto_step;
 116         unsigned int auto_sub_step;
 117         unsigned int started_auto_step;
 118         unsigned int min_delay;
 119         unsigned int max_drift;
 120         unsigned int step_size;
 121         int quality;
 122         unsigned int check_wrapped;
 123         enum dvbfe_search algo_status;
 124 
 125 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 126         struct media_pipeline pipe;
 127 #endif
 128 };
 129 
 130 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 131                                         void (*release)(struct dvb_frontend *fe));
 132 
 133 static void __dvb_frontend_free(struct dvb_frontend *fe)
 134 {
 135         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 136 
 137         if (fepriv)
 138                 dvb_free_device(fepriv->dvbdev);
 139 
 140         dvb_frontend_invoke_release(fe, fe->ops.release);
 141 
 142         kfree(fepriv);
 143 }
 144 
 145 static void dvb_frontend_free(struct kref *ref)
 146 {
 147         struct dvb_frontend *fe =
 148                 container_of(ref, struct dvb_frontend, refcount);
 149 
 150         __dvb_frontend_free(fe);
 151 }
 152 
 153 static void dvb_frontend_put(struct dvb_frontend *fe)
 154 {
 155         /* call detach before dropping the reference count */
 156         if (fe->ops.detach)
 157                 fe->ops.detach(fe);
 158         /*
 159          * Check if the frontend was registered, as otherwise
 160          * kref was not initialized yet.
 161          */
 162         if (fe->frontend_priv)
 163                 kref_put(&fe->refcount, dvb_frontend_free);
 164         else
 165                 __dvb_frontend_free(fe);
 166 }
 167 
 168 static void dvb_frontend_get(struct dvb_frontend *fe)
 169 {
 170         kref_get(&fe->refcount);
 171 }
 172 
 173 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 174 static int dtv_get_frontend(struct dvb_frontend *fe,
 175                             struct dtv_frontend_properties *c,
 176                             struct dvb_frontend_parameters *p_out);
 177 static int
 178 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 179                                 const struct dtv_frontend_properties *c,
 180                                 struct dvb_frontend_parameters *p);
 181 
 182 static bool has_get_frontend(struct dvb_frontend *fe)
 183 {
 184         return fe->ops.get_frontend;
 185 }
 186 
 187 /*
 188  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 189  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 190  * otherwise, a DVBv3 call will fail.
 191  */
 192 enum dvbv3_emulation_type {
 193         DVBV3_UNKNOWN,
 194         DVBV3_QPSK,
 195         DVBV3_QAM,
 196         DVBV3_OFDM,
 197         DVBV3_ATSC,
 198 };
 199 
 200 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 201 {
 202         switch (delivery_system) {
 203         case SYS_DVBC_ANNEX_A:
 204         case SYS_DVBC_ANNEX_C:
 205                 return DVBV3_QAM;
 206         case SYS_DVBS:
 207         case SYS_DVBS2:
 208         case SYS_TURBO:
 209         case SYS_ISDBS:
 210         case SYS_DSS:
 211                 return DVBV3_QPSK;
 212         case SYS_DVBT:
 213         case SYS_DVBT2:
 214         case SYS_ISDBT:
 215         case SYS_DTMB:
 216                 return DVBV3_OFDM;
 217         case SYS_ATSC:
 218         case SYS_ATSCMH:
 219         case SYS_DVBC_ANNEX_B:
 220                 return DVBV3_ATSC;
 221         case SYS_UNDEFINED:
 222         case SYS_ISDBC:
 223         case SYS_DVBH:
 224         case SYS_DAB:
 225         default:
 226                 /*
 227                  * Doesn't know how to emulate those types and/or
 228                  * there's no frontend driver from this type yet
 229                  * with some emulation code, so, we're not sure yet how
 230                  * to handle them, or they're not compatible with a DVBv3 call.
 231                  */
 232                 return DVBV3_UNKNOWN;
 233         }
 234 }
 235 
 236 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 237                                    enum fe_status status)
 238 {
 239         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 240         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 241         struct dvb_fe_events *events = &fepriv->events;
 242         struct dvb_frontend_event *e;
 243         int wp;
 244 
 245         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 246 
 247         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 248                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 249 
 250         mutex_lock(&events->mtx);
 251 
 252         wp = (events->eventw + 1) % MAX_EVENT;
 253         if (wp == events->eventr) {
 254                 events->overflow = 1;
 255                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 256         }
 257 
 258         e = &events->events[events->eventw];
 259         e->status = status;
 260         e->parameters = fepriv->parameters_out;
 261 
 262         events->eventw = wp;
 263 
 264         mutex_unlock(&events->mtx);
 265 
 266         wake_up_interruptible(&events->wait_queue);
 267 }
 268 
 269 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 270                                    struct dvb_fe_events *events)
 271 {
 272         int ret;
 273 
 274         up(&fepriv->sem);
 275         ret = events->eventw != events->eventr;
 276         down(&fepriv->sem);
 277 
 278         return ret;
 279 }
 280 
 281 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 282                                   struct dvb_frontend_event *event, int flags)
 283 {
 284         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 285         struct dvb_fe_events *events = &fepriv->events;
 286 
 287         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 288 
 289         if (events->overflow) {
 290                 events->overflow = 0;
 291                 return -EOVERFLOW;
 292         }
 293 
 294         if (events->eventw == events->eventr) {
 295                 int ret;
 296 
 297                 if (flags & O_NONBLOCK)
 298                         return -EWOULDBLOCK;
 299 
 300                 ret = wait_event_interruptible(events->wait_queue,
 301                                                dvb_frontend_test_event(fepriv, events));
 302 
 303                 if (ret < 0)
 304                         return ret;
 305         }
 306 
 307         mutex_lock(&events->mtx);
 308         *event = events->events[events->eventr];
 309         events->eventr = (events->eventr + 1) % MAX_EVENT;
 310         mutex_unlock(&events->mtx);
 311 
 312         return 0;
 313 }
 314 
 315 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 316 {
 317         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 318         struct dvb_fe_events *events = &fepriv->events;
 319 
 320         mutex_lock(&events->mtx);
 321         events->eventr = events->eventw;
 322         mutex_unlock(&events->mtx);
 323 }
 324 
 325 static void dvb_frontend_init(struct dvb_frontend *fe)
 326 {
 327         dev_dbg(fe->dvb->device,
 328                 "%s: initialising adapter %i frontend %i (%s)...\n",
 329                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 330 
 331         if (fe->ops.init)
 332                 fe->ops.init(fe);
 333         if (fe->ops.tuner_ops.init) {
 334                 if (fe->ops.i2c_gate_ctrl)
 335                         fe->ops.i2c_gate_ctrl(fe, 1);
 336                 fe->ops.tuner_ops.init(fe);
 337                 if (fe->ops.i2c_gate_ctrl)
 338                         fe->ops.i2c_gate_ctrl(fe, 0);
 339         }
 340 }
 341 
 342 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 343 {
 344         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 345 
 346         fepriv->reinitialise = 1;
 347         dvb_frontend_wakeup(fe);
 348 }
 349 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 350 
 351 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 352 {
 353         int q2;
 354         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 355 
 356         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 357 
 358         if (locked)
 359                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 360         else
 361                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 362 
 363         q2 = fepriv->quality - 128;
 364         q2 *= q2;
 365 
 366         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 367 }
 368 
 369 /**
 370  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 371  *      parameters.
 372  *
 373  * @fe: The frontend concerned.
 374  * @check_wrapped: Checks if an iteration has completed.
 375  *                 DO NOT SET ON THE FIRST ATTEMPT.
 376  *
 377  * return: Number of complete iterations that have been performed.
 378  */
 379 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 380 {
 381         int autoinversion;
 382         int ready = 0;
 383         int fe_set_err = 0;
 384         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 385         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 386         int original_inversion = c->inversion;
 387         u32 original_frequency = c->frequency;
 388 
 389         /* are we using autoinversion? */
 390         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 391                          (c->inversion == INVERSION_AUTO));
 392 
 393         /* setup parameters correctly */
 394         while (!ready) {
 395                 /* calculate the lnb_drift */
 396                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 397 
 398                 /* wrap the auto_step if we've exceeded the maximum drift */
 399                 if (fepriv->lnb_drift > fepriv->max_drift) {
 400                         fepriv->auto_step = 0;
 401                         fepriv->auto_sub_step = 0;
 402                         fepriv->lnb_drift = 0;
 403                 }
 404 
 405                 /* perform inversion and +/- zigzag */
 406                 switch (fepriv->auto_sub_step) {
 407                 case 0:
 408                         /* try with the current inversion and current drift setting */
 409                         ready = 1;
 410                         break;
 411 
 412                 case 1:
 413                         if (!autoinversion) break;
 414 
 415                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 416                         ready = 1;
 417                         break;
 418 
 419                 case 2:
 420                         if (fepriv->lnb_drift == 0) break;
 421 
 422                         fepriv->lnb_drift = -fepriv->lnb_drift;
 423                         ready = 1;
 424                         break;
 425 
 426                 case 3:
 427                         if (fepriv->lnb_drift == 0) break;
 428                         if (!autoinversion) break;
 429 
 430                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 431                         fepriv->lnb_drift = -fepriv->lnb_drift;
 432                         ready = 1;
 433                         break;
 434 
 435                 default:
 436                         fepriv->auto_step++;
 437                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 438                         break;
 439                 }
 440 
 441                 if (!ready) fepriv->auto_sub_step++;
 442         }
 443 
 444         /* if this attempt would hit where we started, indicate a complete
 445          * iteration has occurred */
 446         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 447             (fepriv->auto_sub_step == 0) && check_wrapped) {
 448                 return 1;
 449         }
 450 
 451         dev_dbg(fe->dvb->device,
 452                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 453                 __func__, fepriv->lnb_drift, fepriv->inversion,
 454                 fepriv->auto_step, fepriv->auto_sub_step,
 455                 fepriv->started_auto_step);
 456 
 457         /* set the frontend itself */
 458         c->frequency += fepriv->lnb_drift;
 459         if (autoinversion)
 460                 c->inversion = fepriv->inversion;
 461         tmp = *c;
 462         if (fe->ops.set_frontend)
 463                 fe_set_err = fe->ops.set_frontend(fe);
 464         *c = tmp;
 465         if (fe_set_err < 0) {
 466                 fepriv->state = FESTATE_ERROR;
 467                 return fe_set_err;
 468         }
 469 
 470         c->frequency = original_frequency;
 471         c->inversion = original_inversion;
 472 
 473         fepriv->auto_sub_step++;
 474         return 0;
 475 }
 476 
 477 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 478 {
 479         enum fe_status s = FE_NONE;
 480         int retval = 0;
 481         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 482         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 483 
 484         /* if we've got no parameters, just keep idling */
 485         if (fepriv->state & FESTATE_IDLE) {
 486                 fepriv->delay = 3 * HZ;
 487                 fepriv->quality = 0;
 488                 return;
 489         }
 490 
 491         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 492         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 493                 if (fepriv->state & FESTATE_RETUNE) {
 494                         tmp = *c;
 495                         if (fe->ops.set_frontend)
 496                                 retval = fe->ops.set_frontend(fe);
 497                         *c = tmp;
 498                         if (retval < 0)
 499                                 fepriv->state = FESTATE_ERROR;
 500                         else
 501                                 fepriv->state = FESTATE_TUNED;
 502                 }
 503                 fepriv->delay = 3 * HZ;
 504                 fepriv->quality = 0;
 505                 return;
 506         }
 507 
 508         /* get the frontend status */
 509         if (fepriv->state & FESTATE_RETUNE) {
 510                 s = 0;
 511         } else {
 512                 if (fe->ops.read_status)
 513                         fe->ops.read_status(fe, &s);
 514                 if (s != fepriv->status) {
 515                         dvb_frontend_add_event(fe, s);
 516                         fepriv->status = s;
 517                 }
 518         }
 519 
 520         /* if we're not tuned, and we have a lock, move to the TUNED state */
 521         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 522                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 523                 fepriv->state = FESTATE_TUNED;
 524 
 525                 /* if we're tuned, then we have determined the correct inversion */
 526                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 527                     (c->inversion == INVERSION_AUTO)) {
 528                         c->inversion = fepriv->inversion;
 529                 }
 530                 return;
 531         }
 532 
 533         /* if we are tuned already, check we're still locked */
 534         if (fepriv->state & FESTATE_TUNED) {
 535                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 536 
 537                 /* we're tuned, and the lock is still good... */
 538                 if (s & FE_HAS_LOCK) {
 539                         return;
 540                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 541                         fepriv->state = FESTATE_ZIGZAG_FAST;
 542                         fepriv->started_auto_step = fepriv->auto_step;
 543                         fepriv->check_wrapped = 0;
 544                 }
 545         }
 546 
 547         /* don't actually do anything if we're in the LOSTLOCK state,
 548          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 549         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 550             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 551                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 552                 return;
 553         }
 554 
 555         /* don't do anything if we're in the DISEQC state, since this
 556          * might be someone with a motorized dish controlled by DISEQC.
 557          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 558         if (fepriv->state & FESTATE_DISEQC) {
 559                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 560                 return;
 561         }
 562 
 563         /* if we're in the RETUNE state, set everything up for a brand
 564          * new scan, keeping the current inversion setting, as the next
 565          * tune is _very_ likely to require the same */
 566         if (fepriv->state & FESTATE_RETUNE) {
 567                 fepriv->lnb_drift = 0;
 568                 fepriv->auto_step = 0;
 569                 fepriv->auto_sub_step = 0;
 570                 fepriv->started_auto_step = 0;
 571                 fepriv->check_wrapped = 0;
 572         }
 573 
 574         /* fast zigzag. */
 575         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 576                 fepriv->delay = fepriv->min_delay;
 577 
 578                 /* perform a tune */
 579                 retval = dvb_frontend_swzigzag_autotune(fe,
 580                                                         fepriv->check_wrapped);
 581                 if (retval < 0) {
 582                         return;
 583                 } else if (retval) {
 584                         /* OK, if we've run out of trials at the fast speed.
 585                          * Drop back to slow for the _next_ attempt */
 586                         fepriv->state = FESTATE_SEARCHING_SLOW;
 587                         fepriv->started_auto_step = fepriv->auto_step;
 588                         return;
 589                 }
 590                 fepriv->check_wrapped = 1;
 591 
 592                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 593                  * This ensures we cannot return from an
 594                  * FE_SET_FRONTEND ioctl before the first frontend tune
 595                  * occurs */
 596                 if (fepriv->state & FESTATE_RETUNE) {
 597                         fepriv->state = FESTATE_TUNING_FAST;
 598                 }
 599         }
 600 
 601         /* slow zigzag */
 602         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 603                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 604 
 605                 /* Note: don't bother checking for wrapping; we stay in this
 606                  * state until we get a lock */
 607                 dvb_frontend_swzigzag_autotune(fe, 0);
 608         }
 609 }
 610 
 611 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 612 {
 613         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 614 
 615         if (fe->exit != DVB_FE_NO_EXIT)
 616                 return 1;
 617 
 618         if (fepriv->dvbdev->writers == 1)
 619                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 620                                   dvb_shutdown_timeout * HZ))
 621                         return 1;
 622 
 623         return 0;
 624 }
 625 
 626 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 627 {
 628         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 629 
 630         if (fepriv->wakeup) {
 631                 fepriv->wakeup = 0;
 632                 return 1;
 633         }
 634         return dvb_frontend_is_exiting(fe);
 635 }
 636 
 637 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 638 {
 639         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 640 
 641         fepriv->wakeup = 1;
 642         wake_up_interruptible(&fepriv->wait_queue);
 643 }
 644 
 645 static int dvb_frontend_thread(void *data)
 646 {
 647         struct dvb_frontend *fe = data;
 648         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 649         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 650         enum fe_status s = FE_NONE;
 651         enum dvbfe_algo algo;
 652         bool re_tune = false;
 653         bool semheld = false;
 654 
 655         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 656 
 657         fepriv->check_wrapped = 0;
 658         fepriv->quality = 0;
 659         fepriv->delay = 3 * HZ;
 660         fepriv->status = 0;
 661         fepriv->wakeup = 0;
 662         fepriv->reinitialise = 0;
 663 
 664         dvb_frontend_init(fe);
 665 
 666         set_freezable();
 667         while (1) {
 668                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 669 restart:
 670                 wait_event_interruptible_timeout(fepriv->wait_queue,
 671                                                  dvb_frontend_should_wakeup(fe) ||
 672                                                  kthread_should_stop() ||
 673                                                  freezing(current),
 674                         fepriv->delay);
 675 
 676                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 677                         /* got signal or quitting */
 678                         if (!down_interruptible(&fepriv->sem))
 679                                 semheld = true;
 680                         fe->exit = DVB_FE_NORMAL_EXIT;
 681                         break;
 682                 }
 683 
 684                 if (try_to_freeze())
 685                         goto restart;
 686 
 687                 if (down_interruptible(&fepriv->sem))
 688                         break;
 689 
 690                 if (fepriv->reinitialise) {
 691                         dvb_frontend_init(fe);
 692                         if (fe->ops.set_tone && fepriv->tone != -1)
 693                                 fe->ops.set_tone(fe, fepriv->tone);
 694                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 695                                 fe->ops.set_voltage(fe, fepriv->voltage);
 696                         fepriv->reinitialise = 0;
 697                 }
 698 
 699                 /* do an iteration of the tuning loop */
 700                 if (fe->ops.get_frontend_algo) {
 701                         algo = fe->ops.get_frontend_algo(fe);
 702                         switch (algo) {
 703                         case DVBFE_ALGO_HW:
 704                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 705 
 706                                 if (fepriv->state & FESTATE_RETUNE) {
 707                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 708                                         re_tune = true;
 709                                         fepriv->state = FESTATE_TUNED;
 710                                 } else {
 711                                         re_tune = false;
 712                                 }
 713 
 714                                 if (fe->ops.tune)
 715                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 716 
 717                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 718                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 719                                         dvb_frontend_add_event(fe, s);
 720                                         fepriv->status = s;
 721                                 }
 722                                 break;
 723                         case DVBFE_ALGO_SW:
 724                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 725                                 dvb_frontend_swzigzag(fe);
 726                                 break;
 727                         case DVBFE_ALGO_CUSTOM:
 728                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 729                                 if (fepriv->state & FESTATE_RETUNE) {
 730                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 731                                         fepriv->state = FESTATE_TUNED;
 732                                 }
 733                                 /* Case where we are going to search for a carrier
 734                                  * User asked us to retune again for some reason, possibly
 735                                  * requesting a search with a new set of parameters
 736                                  */
 737                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 738                                         if (fe->ops.search) {
 739                                                 fepriv->algo_status = fe->ops.search(fe);
 740                                                 /* We did do a search as was requested, the flags are
 741                                                  * now unset as well and has the flags wrt to search.
 742                                                  */
 743                                         } else {
 744                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 745                                         }
 746                                 }
 747                                 /* Track the carrier if the search was successful */
 748                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 749                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 750                                         fepriv->delay = HZ / 2;
 751                                 }
 752                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 753                                 fe->ops.read_status(fe, &s);
 754                                 if (s != fepriv->status) {
 755                                         dvb_frontend_add_event(fe, s); /* update event list */
 756                                         fepriv->status = s;
 757                                         if (!(s & FE_HAS_LOCK)) {
 758                                                 fepriv->delay = HZ / 10;
 759                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 760                                         } else {
 761                                                 fepriv->delay = 60 * HZ;
 762                                         }
 763                                 }
 764                                 break;
 765                         default:
 766                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 767                                 break;
 768                         }
 769                 } else {
 770                         dvb_frontend_swzigzag(fe);
 771                 }
 772         }
 773 
 774         if (dvb_powerdown_on_sleep) {
 775                 if (fe->ops.set_voltage)
 776                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 777                 if (fe->ops.tuner_ops.sleep) {
 778                         if (fe->ops.i2c_gate_ctrl)
 779                                 fe->ops.i2c_gate_ctrl(fe, 1);
 780                         fe->ops.tuner_ops.sleep(fe);
 781                         if (fe->ops.i2c_gate_ctrl)
 782                                 fe->ops.i2c_gate_ctrl(fe, 0);
 783                 }
 784                 if (fe->ops.sleep)
 785                         fe->ops.sleep(fe);
 786         }
 787 
 788         fepriv->thread = NULL;
 789         if (kthread_should_stop())
 790                 fe->exit = DVB_FE_DEVICE_REMOVED;
 791         else
 792                 fe->exit = DVB_FE_NO_EXIT;
 793         mb();
 794 
 795         if (semheld)
 796                 up(&fepriv->sem);
 797         dvb_frontend_wakeup(fe);
 798         return 0;
 799 }
 800 
 801 static void dvb_frontend_stop(struct dvb_frontend *fe)
 802 {
 803         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 804 
 805         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 806 
 807         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 808                 fe->exit = DVB_FE_NORMAL_EXIT;
 809         mb();
 810 
 811         if (!fepriv->thread)
 812                 return;
 813 
 814         kthread_stop(fepriv->thread);
 815 
 816         sema_init(&fepriv->sem, 1);
 817         fepriv->state = FESTATE_IDLE;
 818 
 819         /* paranoia check in case a signal arrived */
 820         if (fepriv->thread)
 821                 dev_warn(fe->dvb->device,
 822                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 823                          fepriv->thread);
 824 }
 825 
 826 /*
 827  * Sleep for the amount of time given by add_usec parameter
 828  *
 829  * This needs to be as precise as possible, as it affects the detection of
 830  * the dish tone command at the satellite subsystem. The precision is improved
 831  * by using a scheduled msleep followed by udelay for the remainder.
 832  */
 833 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 834 {
 835         s32 delta;
 836 
 837         *waketime = ktime_add_us(*waketime, add_usec);
 838         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 839         if (delta > 2500) {
 840                 msleep((delta - 1500) / 1000);
 841                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 842         }
 843         if (delta > 0)
 844                 udelay(delta);
 845 }
 846 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 847 
 848 static int dvb_frontend_start(struct dvb_frontend *fe)
 849 {
 850         int ret;
 851         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 852         struct task_struct *fe_thread;
 853 
 854         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 855 
 856         if (fepriv->thread) {
 857                 if (fe->exit == DVB_FE_NO_EXIT)
 858                         return 0;
 859                 else
 860                         dvb_frontend_stop(fe);
 861         }
 862 
 863         if (signal_pending(current))
 864                 return -EINTR;
 865         if (down_interruptible(&fepriv->sem))
 866                 return -EINTR;
 867 
 868         fepriv->state = FESTATE_IDLE;
 869         fe->exit = DVB_FE_NO_EXIT;
 870         fepriv->thread = NULL;
 871         mb();
 872 
 873         fe_thread = kthread_run(dvb_frontend_thread, fe,
 874                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 875         if (IS_ERR(fe_thread)) {
 876                 ret = PTR_ERR(fe_thread);
 877                 dev_warn(fe->dvb->device,
 878                          "dvb_frontend_start: failed to start kthread (%d)\n",
 879                          ret);
 880                 up(&fepriv->sem);
 881                 return ret;
 882         }
 883         fepriv->thread = fe_thread;
 884         return 0;
 885 }
 886 
 887 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 888                                               u32 *freq_min, u32 *freq_max,
 889                                               u32 *tolerance)
 890 {
 891         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 892         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 893         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 894         u32 frontend_min = fe->ops.info.frequency_min_hz;
 895         u32 frontend_max = fe->ops.info.frequency_max_hz;
 896 
 897         *freq_min = max(frontend_min, tuner_min);
 898 
 899         if (frontend_max == 0)
 900                 *freq_max = tuner_max;
 901         else if (tuner_max == 0)
 902                 *freq_max = frontend_max;
 903         else
 904                 *freq_max = min(frontend_max, tuner_max);
 905 
 906         if (*freq_min == 0 || *freq_max == 0)
 907                 dev_warn(fe->dvb->device,
 908                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 909                          fe->dvb->num, fe->id);
 910 
 911         dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
 912                 tuner_min, tuner_max, frontend_min, frontend_max);
 913 
 914         /* If the standard is for satellite, convert frequencies to kHz */
 915         switch (c->delivery_system) {
 916         case SYS_DVBS:
 917         case SYS_DVBS2:
 918         case SYS_TURBO:
 919         case SYS_ISDBS:
 920                 *freq_min /= kHz;
 921                 *freq_max /= kHz;
 922                 if (tolerance)
 923                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 924 
 925                 break;
 926         default:
 927                 if (tolerance)
 928                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 929                 break;
 930         }
 931 }
 932 
 933 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 934 {
 935         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 936         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 937         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 938         u32 step = max(fe_step, tuner_step);
 939 
 940         switch (c->delivery_system) {
 941         case SYS_DVBS:
 942         case SYS_DVBS2:
 943         case SYS_TURBO:
 944         case SYS_ISDBS:
 945                 step /= kHz;
 946                 break;
 947         default:
 948                 break;
 949         }
 950 
 951         return step;
 952 }
 953 
 954 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 955 {
 956         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 957         u32 freq_min;
 958         u32 freq_max;
 959 
 960         /* range check: frequency */
 961         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 962         if ((freq_min && c->frequency < freq_min) ||
 963             (freq_max && c->frequency > freq_max)) {
 964                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 965                          fe->dvb->num, fe->id, c->frequency,
 966                          freq_min, freq_max);
 967                 return -EINVAL;
 968         }
 969 
 970         /* range check: symbol rate */
 971         switch (c->delivery_system) {
 972         case SYS_DVBS:
 973         case SYS_DVBS2:
 974         case SYS_TURBO:
 975         case SYS_DVBC_ANNEX_A:
 976         case SYS_DVBC_ANNEX_C:
 977                 if ((fe->ops.info.symbol_rate_min &&
 978                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 979                     (fe->ops.info.symbol_rate_max &&
 980                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 981                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 982                                  fe->dvb->num, fe->id, c->symbol_rate,
 983                                  fe->ops.info.symbol_rate_min,
 984                                  fe->ops.info.symbol_rate_max);
 985                         return -EINVAL;
 986                 }
 987         default:
 988                 break;
 989         }
 990 
 991         return 0;
 992 }
 993 
 994 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 995 {
 996         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 997         int i;
 998         u32 delsys;
 999 
1000         delsys = c->delivery_system;
1001         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1002         c->delivery_system = delsys;
1003 
1004         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1005                 __func__, c->delivery_system);
1006 
1007         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1008         c->bandwidth_hz = 0;    /* AUTO */
1009         c->guard_interval = GUARD_INTERVAL_AUTO;
1010         c->hierarchy = HIERARCHY_AUTO;
1011         c->symbol_rate = 0;
1012         c->code_rate_HP = FEC_AUTO;
1013         c->code_rate_LP = FEC_AUTO;
1014         c->fec_inner = FEC_AUTO;
1015         c->rolloff = ROLLOFF_AUTO;
1016         c->voltage = SEC_VOLTAGE_OFF;
1017         c->sectone = SEC_TONE_OFF;
1018         c->pilot = PILOT_AUTO;
1019 
1020         c->isdbt_partial_reception = 0;
1021         c->isdbt_sb_mode = 0;
1022         c->isdbt_sb_subchannel = 0;
1023         c->isdbt_sb_segment_idx = 0;
1024         c->isdbt_sb_segment_count = 0;
1025         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1026         for (i = 0; i < 3; i++) {
1027                 c->layer[i].fec = FEC_AUTO;
1028                 c->layer[i].modulation = QAM_AUTO;
1029                 c->layer[i].interleaving = 0;
1030                 c->layer[i].segment_count = 0;
1031         }
1032 
1033         c->stream_id = NO_STREAM_ID_FILTER;
1034         c->scrambling_sequence_index = 0;/* default sequence */
1035 
1036         switch (c->delivery_system) {
1037         case SYS_DVBS:
1038         case SYS_DVBS2:
1039         case SYS_TURBO:
1040                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1041                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1042                 break;
1043         case SYS_ATSC:
1044                 c->modulation = VSB_8;
1045                 break;
1046         case SYS_ISDBS:
1047                 c->symbol_rate = 28860000;
1048                 c->rolloff = ROLLOFF_35;
1049                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1050                 break;
1051         default:
1052                 c->modulation = QAM_AUTO;
1053                 break;
1054         }
1055 
1056         c->lna = LNA_AUTO;
1057 
1058         return 0;
1059 }
1060 
1061 #define _DTV_CMD(n, s, b) \
1062 [n] = { \
1063         .name = #n, \
1064         .cmd  = n, \
1065         .set  = s,\
1066         .buffer = b \
1067 }
1068 
1069 struct dtv_cmds_h {
1070         char    *name;          /* A display name for debugging purposes */
1071 
1072         __u32   cmd;            /* A unique ID */
1073 
1074         /* Flags */
1075         __u32   set:1;          /* Either a set or get property */
1076         __u32   buffer:1;       /* Does this property use the buffer? */
1077         __u32   reserved:30;    /* Align */
1078 };
1079 
1080 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1081         _DTV_CMD(DTV_TUNE, 1, 0),
1082         _DTV_CMD(DTV_CLEAR, 1, 0),
1083 
1084         /* Set */
1085         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1086         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1087         _DTV_CMD(DTV_MODULATION, 1, 0),
1088         _DTV_CMD(DTV_INVERSION, 1, 0),
1089         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1090         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1091         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1092         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1093         _DTV_CMD(DTV_TONE, 1, 0),
1094         _DTV_CMD(DTV_PILOT, 1, 0),
1095         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1096         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1097         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1098         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1099         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1100         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1101         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1102         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1103 
1104         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1105         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1106         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1107         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1108         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1109         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1110         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1111         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1112         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1113         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1114         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1115         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1116         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1117         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1118         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1119         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1120         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1121         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1122 
1123         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1124         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1125         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1126         _DTV_CMD(DTV_LNA, 1, 0),
1127 
1128         /* Get */
1129         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1130         _DTV_CMD(DTV_API_VERSION, 0, 0),
1131 
1132         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1133 
1134         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1135         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1136 
1137         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1138         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1139         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1140         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1141         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1142         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1143         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1144         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1145         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1146         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1147         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1148         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1149         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1150 
1151         /* Statistics API */
1152         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1153         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1154         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1155         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1156         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1157         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1158         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1159         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1160 };
1161 
1162 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1163  * drivers can use a single set_frontend tuning function, regardless of whether
1164  * it's being used for the legacy or new API, reducing code and complexity.
1165  */
1166 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1167                                    struct dtv_frontend_properties *c,
1168                                    const struct dvb_frontend_parameters *p)
1169 {
1170         c->frequency = p->frequency;
1171         c->inversion = p->inversion;
1172 
1173         switch (dvbv3_type(c->delivery_system)) {
1174         case DVBV3_QPSK:
1175                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1176                 c->symbol_rate = p->u.qpsk.symbol_rate;
1177                 c->fec_inner = p->u.qpsk.fec_inner;
1178                 break;
1179         case DVBV3_QAM:
1180                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1181                 c->symbol_rate = p->u.qam.symbol_rate;
1182                 c->fec_inner = p->u.qam.fec_inner;
1183                 c->modulation = p->u.qam.modulation;
1184                 break;
1185         case DVBV3_OFDM:
1186                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1187 
1188                 switch (p->u.ofdm.bandwidth) {
1189                 case BANDWIDTH_10_MHZ:
1190                         c->bandwidth_hz = 10000000;
1191                         break;
1192                 case BANDWIDTH_8_MHZ:
1193                         c->bandwidth_hz = 8000000;
1194                         break;
1195                 case BANDWIDTH_7_MHZ:
1196                         c->bandwidth_hz = 7000000;
1197                         break;
1198                 case BANDWIDTH_6_MHZ:
1199                         c->bandwidth_hz = 6000000;
1200                         break;
1201                 case BANDWIDTH_5_MHZ:
1202                         c->bandwidth_hz = 5000000;
1203                         break;
1204                 case BANDWIDTH_1_712_MHZ:
1205                         c->bandwidth_hz = 1712000;
1206                         break;
1207                 case BANDWIDTH_AUTO:
1208                         c->bandwidth_hz = 0;
1209                 }
1210 
1211                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1212                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1213                 c->modulation = p->u.ofdm.constellation;
1214                 c->transmission_mode = p->u.ofdm.transmission_mode;
1215                 c->guard_interval = p->u.ofdm.guard_interval;
1216                 c->hierarchy = p->u.ofdm.hierarchy_information;
1217                 break;
1218         case DVBV3_ATSC:
1219                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1220                 c->modulation = p->u.vsb.modulation;
1221                 if (c->delivery_system == SYS_ATSCMH)
1222                         break;
1223                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1224                         c->delivery_system = SYS_ATSC;
1225                 else
1226                         c->delivery_system = SYS_DVBC_ANNEX_B;
1227                 break;
1228         case DVBV3_UNKNOWN:
1229                 dev_err(fe->dvb->device,
1230                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1231                         __func__, c->delivery_system);
1232                 return -EINVAL;
1233         }
1234 
1235         return 0;
1236 }
1237 
1238 /* Ensure the cached values are set correctly in the frontend
1239  * legacy tuning structures, for the advanced tuning API.
1240  */
1241 static int
1242 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1243                                 const struct dtv_frontend_properties *c,
1244                                 struct dvb_frontend_parameters *p)
1245 {
1246         p->frequency = c->frequency;
1247         p->inversion = c->inversion;
1248 
1249         switch (dvbv3_type(c->delivery_system)) {
1250         case DVBV3_UNKNOWN:
1251                 dev_err(fe->dvb->device,
1252                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1253                         __func__, c->delivery_system);
1254                 return -EINVAL;
1255         case DVBV3_QPSK:
1256                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1257                 p->u.qpsk.symbol_rate = c->symbol_rate;
1258                 p->u.qpsk.fec_inner = c->fec_inner;
1259                 break;
1260         case DVBV3_QAM:
1261                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1262                 p->u.qam.symbol_rate = c->symbol_rate;
1263                 p->u.qam.fec_inner = c->fec_inner;
1264                 p->u.qam.modulation = c->modulation;
1265                 break;
1266         case DVBV3_OFDM:
1267                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1268                 switch (c->bandwidth_hz) {
1269                 case 10000000:
1270                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1271                         break;
1272                 case 8000000:
1273                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1274                         break;
1275                 case 7000000:
1276                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1277                         break;
1278                 case 6000000:
1279                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1280                         break;
1281                 case 5000000:
1282                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1283                         break;
1284                 case 1712000:
1285                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1286                         break;
1287                 case 0:
1288                 default:
1289                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1290                 }
1291                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1292                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1293                 p->u.ofdm.constellation = c->modulation;
1294                 p->u.ofdm.transmission_mode = c->transmission_mode;
1295                 p->u.ofdm.guard_interval = c->guard_interval;
1296                 p->u.ofdm.hierarchy_information = c->hierarchy;
1297                 break;
1298         case DVBV3_ATSC:
1299                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1300                 p->u.vsb.modulation = c->modulation;
1301                 break;
1302         }
1303         return 0;
1304 }
1305 
1306 /**
1307  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1308  * @fe:         struct dvb_frontend pointer
1309  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1310  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1311  *
1312  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1313  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1314  * If p_out is not null, it will update the DVBv3 params pointed by it.
1315  */
1316 static int dtv_get_frontend(struct dvb_frontend *fe,
1317                             struct dtv_frontend_properties *c,
1318                             struct dvb_frontend_parameters *p_out)
1319 {
1320         int r;
1321 
1322         if (fe->ops.get_frontend) {
1323                 r = fe->ops.get_frontend(fe, c);
1324                 if (unlikely(r < 0))
1325                         return r;
1326                 if (p_out)
1327                         dtv_property_legacy_params_sync(fe, c, p_out);
1328                 return 0;
1329         }
1330 
1331         /* As everything is in cache, get_frontend fops are always supported */
1332         return 0;
1333 }
1334 
1335 static int dvb_frontend_handle_ioctl(struct file *file,
1336                                      unsigned int cmd, void *parg);
1337 
1338 static int dtv_property_process_get(struct dvb_frontend *fe,
1339                                     const struct dtv_frontend_properties *c,
1340                                     struct dtv_property *tvp,
1341                                     struct file *file)
1342 {
1343         int ncaps;
1344 
1345         switch (tvp->cmd) {
1346         case DTV_ENUM_DELSYS:
1347                 ncaps = 0;
1348                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1349                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1350                         ncaps++;
1351                 }
1352                 tvp->u.buffer.len = ncaps;
1353                 break;
1354         case DTV_FREQUENCY:
1355                 tvp->u.data = c->frequency;
1356                 break;
1357         case DTV_MODULATION:
1358                 tvp->u.data = c->modulation;
1359                 break;
1360         case DTV_BANDWIDTH_HZ:
1361                 tvp->u.data = c->bandwidth_hz;
1362                 break;
1363         case DTV_INVERSION:
1364                 tvp->u.data = c->inversion;
1365                 break;
1366         case DTV_SYMBOL_RATE:
1367                 tvp->u.data = c->symbol_rate;
1368                 break;
1369         case DTV_INNER_FEC:
1370                 tvp->u.data = c->fec_inner;
1371                 break;
1372         case DTV_PILOT:
1373                 tvp->u.data = c->pilot;
1374                 break;
1375         case DTV_ROLLOFF:
1376                 tvp->u.data = c->rolloff;
1377                 break;
1378         case DTV_DELIVERY_SYSTEM:
1379                 tvp->u.data = c->delivery_system;
1380                 break;
1381         case DTV_VOLTAGE:
1382                 tvp->u.data = c->voltage;
1383                 break;
1384         case DTV_TONE:
1385                 tvp->u.data = c->sectone;
1386                 break;
1387         case DTV_API_VERSION:
1388                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1389                 break;
1390         case DTV_CODE_RATE_HP:
1391                 tvp->u.data = c->code_rate_HP;
1392                 break;
1393         case DTV_CODE_RATE_LP:
1394                 tvp->u.data = c->code_rate_LP;
1395                 break;
1396         case DTV_GUARD_INTERVAL:
1397                 tvp->u.data = c->guard_interval;
1398                 break;
1399         case DTV_TRANSMISSION_MODE:
1400                 tvp->u.data = c->transmission_mode;
1401                 break;
1402         case DTV_HIERARCHY:
1403                 tvp->u.data = c->hierarchy;
1404                 break;
1405         case DTV_INTERLEAVING:
1406                 tvp->u.data = c->interleaving;
1407                 break;
1408 
1409         /* ISDB-T Support here */
1410         case DTV_ISDBT_PARTIAL_RECEPTION:
1411                 tvp->u.data = c->isdbt_partial_reception;
1412                 break;
1413         case DTV_ISDBT_SOUND_BROADCASTING:
1414                 tvp->u.data = c->isdbt_sb_mode;
1415                 break;
1416         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1417                 tvp->u.data = c->isdbt_sb_subchannel;
1418                 break;
1419         case DTV_ISDBT_SB_SEGMENT_IDX:
1420                 tvp->u.data = c->isdbt_sb_segment_idx;
1421                 break;
1422         case DTV_ISDBT_SB_SEGMENT_COUNT:
1423                 tvp->u.data = c->isdbt_sb_segment_count;
1424                 break;
1425         case DTV_ISDBT_LAYER_ENABLED:
1426                 tvp->u.data = c->isdbt_layer_enabled;
1427                 break;
1428         case DTV_ISDBT_LAYERA_FEC:
1429                 tvp->u.data = c->layer[0].fec;
1430                 break;
1431         case DTV_ISDBT_LAYERA_MODULATION:
1432                 tvp->u.data = c->layer[0].modulation;
1433                 break;
1434         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1435                 tvp->u.data = c->layer[0].segment_count;
1436                 break;
1437         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1438                 tvp->u.data = c->layer[0].interleaving;
1439                 break;
1440         case DTV_ISDBT_LAYERB_FEC:
1441                 tvp->u.data = c->layer[1].fec;
1442                 break;
1443         case DTV_ISDBT_LAYERB_MODULATION:
1444                 tvp->u.data = c->layer[1].modulation;
1445                 break;
1446         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1447                 tvp->u.data = c->layer[1].segment_count;
1448                 break;
1449         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1450                 tvp->u.data = c->layer[1].interleaving;
1451                 break;
1452         case DTV_ISDBT_LAYERC_FEC:
1453                 tvp->u.data = c->layer[2].fec;
1454                 break;
1455         case DTV_ISDBT_LAYERC_MODULATION:
1456                 tvp->u.data = c->layer[2].modulation;
1457                 break;
1458         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1459                 tvp->u.data = c->layer[2].segment_count;
1460                 break;
1461         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1462                 tvp->u.data = c->layer[2].interleaving;
1463                 break;
1464 
1465         /* Multistream support */
1466         case DTV_STREAM_ID:
1467         case DTV_DVBT2_PLP_ID_LEGACY:
1468                 tvp->u.data = c->stream_id;
1469                 break;
1470 
1471         /* Physical layer scrambling support */
1472         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1473                 tvp->u.data = c->scrambling_sequence_index;
1474                 break;
1475 
1476         /* ATSC-MH */
1477         case DTV_ATSCMH_FIC_VER:
1478                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1479                 break;
1480         case DTV_ATSCMH_PARADE_ID:
1481                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1482                 break;
1483         case DTV_ATSCMH_NOG:
1484                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1485                 break;
1486         case DTV_ATSCMH_TNOG:
1487                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1488                 break;
1489         case DTV_ATSCMH_SGN:
1490                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1491                 break;
1492         case DTV_ATSCMH_PRC:
1493                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1494                 break;
1495         case DTV_ATSCMH_RS_FRAME_MODE:
1496                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1497                 break;
1498         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1499                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1500                 break;
1501         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1502                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1503                 break;
1504         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1505                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1506                 break;
1507         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1508                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1509                 break;
1510         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1511                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1512                 break;
1513         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1514                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1515                 break;
1516         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1517                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1518                 break;
1519         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1520                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1521                 break;
1522 
1523         case DTV_LNA:
1524                 tvp->u.data = c->lna;
1525                 break;
1526 
1527         /* Fill quality measures */
1528         case DTV_STAT_SIGNAL_STRENGTH:
1529                 tvp->u.st = c->strength;
1530                 break;
1531         case DTV_STAT_CNR:
1532                 tvp->u.st = c->cnr;
1533                 break;
1534         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1535                 tvp->u.st = c->pre_bit_error;
1536                 break;
1537         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1538                 tvp->u.st = c->pre_bit_count;
1539                 break;
1540         case DTV_STAT_POST_ERROR_BIT_COUNT:
1541                 tvp->u.st = c->post_bit_error;
1542                 break;
1543         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1544                 tvp->u.st = c->post_bit_count;
1545                 break;
1546         case DTV_STAT_ERROR_BLOCK_COUNT:
1547                 tvp->u.st = c->block_error;
1548                 break;
1549         case DTV_STAT_TOTAL_BLOCK_COUNT:
1550                 tvp->u.st = c->block_count;
1551                 break;
1552         default:
1553                 dev_dbg(fe->dvb->device,
1554                         "%s: FE property %d doesn't exist\n",
1555                         __func__, tvp->cmd);
1556                 return -EINVAL;
1557         }
1558 
1559         if (!dtv_cmds[tvp->cmd].buffer)
1560                 dev_dbg(fe->dvb->device,
1561                         "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1562                         __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1563                         tvp->u.data);
1564         else
1565                 dev_dbg(fe->dvb->device,
1566                         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1567                         __func__,
1568                         tvp->cmd, dtv_cmds[tvp->cmd].name,
1569                         tvp->u.buffer.len,
1570                         tvp->u.buffer.len, tvp->u.buffer.data);
1571 
1572         return 0;
1573 }
1574 
1575 static int dtv_set_frontend(struct dvb_frontend *fe);
1576 
1577 static bool is_dvbv3_delsys(u32 delsys)
1578 {
1579         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1580                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1581 }
1582 
1583 /**
1584  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1585  * @fe:                 struct frontend;
1586  * @delsys:                     DVBv5 type that will be used for emulation
1587  *
1588  * Provides emulation for delivery systems that are compatible with the old
1589  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1590  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1591  * parameters are compatible with DVB-S spec.
1592  */
1593 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1594 {
1595         int i;
1596         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1597 
1598         c->delivery_system = delsys;
1599 
1600         /*
1601          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1602          */
1603         if (c->delivery_system == SYS_ISDBT) {
1604                 dev_dbg(fe->dvb->device,
1605                         "%s: Using defaults for SYS_ISDBT\n",
1606                         __func__);
1607 
1608                 if (!c->bandwidth_hz)
1609                         c->bandwidth_hz = 6000000;
1610 
1611                 c->isdbt_partial_reception = 0;
1612                 c->isdbt_sb_mode = 0;
1613                 c->isdbt_sb_subchannel = 0;
1614                 c->isdbt_sb_segment_idx = 0;
1615                 c->isdbt_sb_segment_count = 0;
1616                 c->isdbt_layer_enabled = 7;
1617                 for (i = 0; i < 3; i++) {
1618                         c->layer[i].fec = FEC_AUTO;
1619                         c->layer[i].modulation = QAM_AUTO;
1620                         c->layer[i].interleaving = 0;
1621                         c->layer[i].segment_count = 0;
1622                 }
1623         }
1624         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1625                 __func__, c->delivery_system);
1626 
1627         return 0;
1628 }
1629 
1630 /**
1631  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1632  * @fe:                 frontend struct
1633  * @desired_system:     delivery system requested by the user
1634  *
1635  * A DVBv5 call know what's the desired system it wants. So, set it.
1636  *
1637  * There are, however, a few known issues with early DVBv5 applications that
1638  * are also handled by this logic:
1639  *
1640  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1641  *    This is an API violation, but, as we don't want to break userspace,
1642  *    convert it to the first supported delivery system.
1643  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1644  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1645  *    ISDB-T provided backward compat with DVB-T.
1646  */
1647 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1648                                      u32 desired_system)
1649 {
1650         int ncaps;
1651         u32 delsys = SYS_UNDEFINED;
1652         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1653         enum dvbv3_emulation_type type;
1654 
1655         /*
1656          * It was reported that some old DVBv5 applications were
1657          * filling delivery_system with SYS_UNDEFINED. If this happens,
1658          * assume that the application wants to use the first supported
1659          * delivery system.
1660          */
1661         if (desired_system == SYS_UNDEFINED)
1662                 desired_system = fe->ops.delsys[0];
1663 
1664         /*
1665          * This is a DVBv5 call. So, it likely knows the supported
1666          * delivery systems. So, check if the desired delivery system is
1667          * supported
1668          */
1669         ncaps = 0;
1670         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1671                 if (fe->ops.delsys[ncaps] == desired_system) {
1672                         c->delivery_system = desired_system;
1673                         dev_dbg(fe->dvb->device,
1674                                 "%s: Changing delivery system to %d\n",
1675                                 __func__, desired_system);
1676                         return 0;
1677                 }
1678                 ncaps++;
1679         }
1680 
1681         /*
1682          * The requested delivery system isn't supported. Maybe userspace
1683          * is requesting a DVBv3 compatible delivery system.
1684          *
1685          * The emulation only works if the desired system is one of the
1686          * delivery systems supported by DVBv3 API
1687          */
1688         if (!is_dvbv3_delsys(desired_system)) {
1689                 dev_dbg(fe->dvb->device,
1690                         "%s: Delivery system %d not supported.\n",
1691                         __func__, desired_system);
1692                 return -EINVAL;
1693         }
1694 
1695         type = dvbv3_type(desired_system);
1696 
1697         /*
1698         * Get the last non-DVBv3 delivery system that has the same type
1699         * of the desired system
1700         */
1701         ncaps = 0;
1702         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1704                         delsys = fe->ops.delsys[ncaps];
1705                 ncaps++;
1706         }
1707 
1708         /* There's nothing compatible with the desired delivery system */
1709         if (delsys == SYS_UNDEFINED) {
1710                 dev_dbg(fe->dvb->device,
1711                         "%s: Delivery system %d not supported on emulation mode.\n",
1712                         __func__, desired_system);
1713                 return -EINVAL;
1714         }
1715 
1716         dev_dbg(fe->dvb->device,
1717                 "%s: Using delivery system %d emulated as if it were %d\n",
1718                 __func__, delsys, desired_system);
1719 
1720         return emulate_delivery_system(fe, desired_system);
1721 }
1722 
1723 /**
1724  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1725  * @fe: frontend struct
1726  *
1727  * A DVBv3 call doesn't know what's the desired system it wants. It also
1728  * doesn't allow to switch between different types. Due to that, userspace
1729  * should use DVBv5 instead.
1730  * However, in order to avoid breaking userspace API, limited backward
1731  * compatibility support is provided.
1732  *
1733  * There are some delivery systems that are incompatible with DVBv3 calls.
1734  *
1735  * This routine should work fine for frontends that support just one delivery
1736  * system.
1737  *
1738  * For frontends that support multiple frontends:
1739  * 1) It defaults to use the first supported delivery system. There's an
1740  *    userspace application that allows changing it at runtime;
1741  *
1742  * 2) If the current delivery system is not compatible with DVBv3, it gets
1743  *    the first one that it is compatible.
1744  *
1745  * NOTE: in order for this to work with applications like Kaffeine that
1746  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1747  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1748  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1749  *      to DVB-S.
1750  */
1751 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1752 {
1753         int ncaps;
1754         u32 delsys = SYS_UNDEFINED;
1755         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1756 
1757         /* If not set yet, defaults to the first supported delivery system */
1758         if (c->delivery_system == SYS_UNDEFINED)
1759                 c->delivery_system = fe->ops.delsys[0];
1760 
1761         /*
1762          * Trivial case: just use the current one, if it already a DVBv3
1763          * delivery system
1764          */
1765         if (is_dvbv3_delsys(c->delivery_system)) {
1766                 dev_dbg(fe->dvb->device,
1767                         "%s: Using delivery system to %d\n",
1768                         __func__, c->delivery_system);
1769                 return 0;
1770         }
1771 
1772         /*
1773          * Seek for the first delivery system that it is compatible with a
1774          * DVBv3 standard
1775          */
1776         ncaps = 0;
1777         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1778                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1779                         delsys = fe->ops.delsys[ncaps];
1780                         break;
1781                 }
1782                 ncaps++;
1783         }
1784         if (delsys == SYS_UNDEFINED) {
1785                 dev_dbg(fe->dvb->device,
1786                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1787                         __func__);
1788                 return -EINVAL;
1789         }
1790         return emulate_delivery_system(fe, delsys);
1791 }
1792 
1793 /**
1794  * dtv_property_process_set -  Sets a single DTV property
1795  * @fe:         Pointer to &struct dvb_frontend
1796  * @file:       Pointer to &struct file
1797  * @cmd:        Digital TV command
1798  * @data:       An unsigned 32-bits number
1799  *
1800  * This routine assigns the property
1801  * value to the corresponding member of
1802  * &struct dtv_frontend_properties
1803  *
1804  * Returns:
1805  * Zero on success, negative errno on failure.
1806  */
1807 static int dtv_property_process_set(struct dvb_frontend *fe,
1808                                     struct file *file,
1809                                     u32 cmd, u32 data)
1810 {
1811         int r = 0;
1812         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1813 
1814         /** Dump DTV command name and value*/
1815         if (!cmd || cmd > DTV_MAX_COMMAND)
1816                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1817                          __func__, cmd);
1818         else
1819                 dev_dbg(fe->dvb->device,
1820                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1821                         __func__, cmd, dtv_cmds[cmd].name, data);
1822         switch (cmd) {
1823         case DTV_CLEAR:
1824                 /*
1825                  * Reset a cache of data specific to the frontend here. This does
1826                  * not effect hardware.
1827                  */
1828                 dvb_frontend_clear_cache(fe);
1829                 break;
1830         case DTV_TUNE:
1831                 /*
1832                  * Use the cached Digital TV properties to tune the
1833                  * frontend
1834                  */
1835                 dev_dbg(fe->dvb->device,
1836                         "%s: Setting the frontend from property cache\n",
1837                         __func__);
1838 
1839                 r = dtv_set_frontend(fe);
1840                 break;
1841         case DTV_FREQUENCY:
1842                 c->frequency = data;
1843                 break;
1844         case DTV_MODULATION:
1845                 c->modulation = data;
1846                 break;
1847         case DTV_BANDWIDTH_HZ:
1848                 c->bandwidth_hz = data;
1849                 break;
1850         case DTV_INVERSION:
1851                 c->inversion = data;
1852                 break;
1853         case DTV_SYMBOL_RATE:
1854                 c->symbol_rate = data;
1855                 break;
1856         case DTV_INNER_FEC:
1857                 c->fec_inner = data;
1858                 break;
1859         case DTV_PILOT:
1860                 c->pilot = data;
1861                 break;
1862         case DTV_ROLLOFF:
1863                 c->rolloff = data;
1864                 break;
1865         case DTV_DELIVERY_SYSTEM:
1866                 r = dvbv5_set_delivery_system(fe, data);
1867                 break;
1868         case DTV_VOLTAGE:
1869                 c->voltage = data;
1870                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1871                                               (void *)c->voltage);
1872                 break;
1873         case DTV_TONE:
1874                 c->sectone = data;
1875                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1876                                               (void *)c->sectone);
1877                 break;
1878         case DTV_CODE_RATE_HP:
1879                 c->code_rate_HP = data;
1880                 break;
1881         case DTV_CODE_RATE_LP:
1882                 c->code_rate_LP = data;
1883                 break;
1884         case DTV_GUARD_INTERVAL:
1885                 c->guard_interval = data;
1886                 break;
1887         case DTV_TRANSMISSION_MODE:
1888                 c->transmission_mode = data;
1889                 break;
1890         case DTV_HIERARCHY:
1891                 c->hierarchy = data;
1892                 break;
1893         case DTV_INTERLEAVING:
1894                 c->interleaving = data;
1895                 break;
1896 
1897         /* ISDB-T Support here */
1898         case DTV_ISDBT_PARTIAL_RECEPTION:
1899                 c->isdbt_partial_reception = data;
1900                 break;
1901         case DTV_ISDBT_SOUND_BROADCASTING:
1902                 c->isdbt_sb_mode = data;
1903                 break;
1904         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1905                 c->isdbt_sb_subchannel = data;
1906                 break;
1907         case DTV_ISDBT_SB_SEGMENT_IDX:
1908                 c->isdbt_sb_segment_idx = data;
1909                 break;
1910         case DTV_ISDBT_SB_SEGMENT_COUNT:
1911                 c->isdbt_sb_segment_count = data;
1912                 break;
1913         case DTV_ISDBT_LAYER_ENABLED:
1914                 c->isdbt_layer_enabled = data;
1915                 break;
1916         case DTV_ISDBT_LAYERA_FEC:
1917                 c->layer[0].fec = data;
1918                 break;
1919         case DTV_ISDBT_LAYERA_MODULATION:
1920                 c->layer[0].modulation = data;
1921                 break;
1922         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1923                 c->layer[0].segment_count = data;
1924                 break;
1925         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1926                 c->layer[0].interleaving = data;
1927                 break;
1928         case DTV_ISDBT_LAYERB_FEC:
1929                 c->layer[1].fec = data;
1930                 break;
1931         case DTV_ISDBT_LAYERB_MODULATION:
1932                 c->layer[1].modulation = data;
1933                 break;
1934         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1935                 c->layer[1].segment_count = data;
1936                 break;
1937         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1938                 c->layer[1].interleaving = data;
1939                 break;
1940         case DTV_ISDBT_LAYERC_FEC:
1941                 c->layer[2].fec = data;
1942                 break;
1943         case DTV_ISDBT_LAYERC_MODULATION:
1944                 c->layer[2].modulation = data;
1945                 break;
1946         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1947                 c->layer[2].segment_count = data;
1948                 break;
1949         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1950                 c->layer[2].interleaving = data;
1951                 break;
1952 
1953         /* Multistream support */
1954         case DTV_STREAM_ID:
1955         case DTV_DVBT2_PLP_ID_LEGACY:
1956                 c->stream_id = data;
1957                 break;
1958 
1959         /* Physical layer scrambling support */
1960         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1961                 c->scrambling_sequence_index = data;
1962                 break;
1963 
1964         /* ATSC-MH */
1965         case DTV_ATSCMH_PARADE_ID:
1966                 fe->dtv_property_cache.atscmh_parade_id = data;
1967                 break;
1968         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1969                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1970                 break;
1971 
1972         case DTV_LNA:
1973                 c->lna = data;
1974                 if (fe->ops.set_lna)
1975                         r = fe->ops.set_lna(fe);
1976                 if (r < 0)
1977                         c->lna = LNA_AUTO;
1978                 break;
1979 
1980         default:
1981                 return -EINVAL;
1982         }
1983 
1984         return r;
1985 }
1986 
1987 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
1988                                  void *parg)
1989 {
1990         struct dvb_device *dvbdev = file->private_data;
1991         struct dvb_frontend *fe = dvbdev->priv;
1992         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1993         int err;
1994 
1995         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1996         if (down_interruptible(&fepriv->sem))
1997                 return -ERESTARTSYS;
1998 
1999         if (fe->exit != DVB_FE_NO_EXIT) {
2000                 up(&fepriv->sem);
2001                 return -ENODEV;
2002         }
2003 
2004         /*
2005          * If the frontend is opened in read-only mode, only the ioctls
2006          * that don't interfere with the tune logic should be accepted.
2007          * That allows an external application to monitor the DVB QoS and
2008          * statistics parameters.
2009          *
2010          * That matches all _IOR() ioctls, except for two special cases:
2011          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2012          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2013          *     setup
2014          * So, those two ioctls should also return -EPERM, as otherwise
2015          * reading from them would interfere with a DVB tune application
2016          */
2017         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2018             && (_IOC_DIR(cmd) != _IOC_READ
2019                 || cmd == FE_GET_EVENT
2020                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2021                 up(&fepriv->sem);
2022                 return -EPERM;
2023         }
2024 
2025         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2026 
2027         up(&fepriv->sem);
2028         return err;
2029 }
2030 
2031 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2032                                unsigned long arg)
2033 {
2034         struct dvb_device *dvbdev = file->private_data;
2035 
2036         if (!dvbdev)
2037                 return -ENODEV;
2038 
2039         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2040 }
2041 
2042 #ifdef CONFIG_COMPAT
2043 struct compat_dtv_property {
2044         __u32 cmd;
2045         __u32 reserved[3];
2046         union {
2047                 __u32 data;
2048                 struct dtv_fe_stats st;
2049                 struct {
2050                         __u8 data[32];
2051                         __u32 len;
2052                         __u32 reserved1[3];
2053                         compat_uptr_t reserved2;
2054                 } buffer;
2055         } u;
2056         int result;
2057 } __attribute__ ((packed));
2058 
2059 struct compat_dtv_properties {
2060         __u32 num;
2061         compat_uptr_t props;
2062 };
2063 
2064 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2065 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2066 
2067 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2068                                             unsigned long arg)
2069 {
2070         struct dvb_device *dvbdev = file->private_data;
2071         struct dvb_frontend *fe = dvbdev->priv;
2072         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2073         int i, err = 0;
2074 
2075         if (cmd == COMPAT_FE_SET_PROPERTY) {
2076                 struct compat_dtv_properties prop, *tvps = NULL;
2077                 struct compat_dtv_property *tvp = NULL;
2078 
2079                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2080                         return -EFAULT;
2081 
2082                 tvps = &prop;
2083 
2084                 /*
2085                  * Put an arbitrary limit on the number of messages that can
2086                  * be sent at once
2087                  */
2088                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2089                         return -EINVAL;
2090 
2091                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2092                 if (IS_ERR(tvp))
2093                         return PTR_ERR(tvp);
2094 
2095                 for (i = 0; i < tvps->num; i++) {
2096                         err = dtv_property_process_set(fe, file,
2097                                                        (tvp + i)->cmd,
2098                                                        (tvp + i)->u.data);
2099                         if (err < 0) {
2100                                 kfree(tvp);
2101                                 return err;
2102                         }
2103                 }
2104                 kfree(tvp);
2105         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2106                 struct compat_dtv_properties prop, *tvps = NULL;
2107                 struct compat_dtv_property *tvp = NULL;
2108                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2109 
2110                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2111                         return -EFAULT;
2112 
2113                 tvps = &prop;
2114 
2115                 /*
2116                  * Put an arbitrary limit on the number of messages that can
2117                  * be sent at once
2118                  */
2119                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2120                         return -EINVAL;
2121 
2122                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2123                 if (IS_ERR(tvp))
2124                         return PTR_ERR(tvp);
2125 
2126                 /*
2127                  * Let's use our own copy of property cache, in order to
2128                  * avoid mangling with DTV zigzag logic, as drivers might
2129                  * return crap, if they don't check if the data is available
2130                  * before updating the properties cache.
2131                  */
2132                 if (fepriv->state != FESTATE_IDLE) {
2133                         err = dtv_get_frontend(fe, &getp, NULL);
2134                         if (err < 0) {
2135                                 kfree(tvp);
2136                                 return err;
2137                         }
2138                 }
2139                 for (i = 0; i < tvps->num; i++) {
2140                         err = dtv_property_process_get(
2141                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2142                         if (err < 0) {
2143                                 kfree(tvp);
2144                                 return err;
2145                         }
2146                 }
2147 
2148                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2149                                  tvps->num * sizeof(struct compat_dtv_property))) {
2150                         kfree(tvp);
2151                         return -EFAULT;
2152                 }
2153                 kfree(tvp);
2154         }
2155 
2156         return err;
2157 }
2158 
2159 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2160                                       unsigned long arg)
2161 {
2162         struct dvb_device *dvbdev = file->private_data;
2163         struct dvb_frontend *fe = dvbdev->priv;
2164         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2165         int err;
2166 
2167         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2168                 if (down_interruptible(&fepriv->sem))
2169                         return -ERESTARTSYS;
2170 
2171                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2172 
2173                 up(&fepriv->sem);
2174                 return err;
2175         }
2176 
2177         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2178 }
2179 #endif
2180 
2181 static int dtv_set_frontend(struct dvb_frontend *fe)
2182 {
2183         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2184         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2185         struct dvb_frontend_tune_settings fetunesettings;
2186         u32 rolloff = 0;
2187 
2188         if (dvb_frontend_check_parameters(fe) < 0)
2189                 return -EINVAL;
2190 
2191         /*
2192          * Initialize output parameters to match the values given by
2193          * the user. FE_SET_FRONTEND triggers an initial frontend event
2194          * with status = 0, which copies output parameters to userspace.
2195          */
2196         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2197 
2198         /*
2199          * Be sure that the bandwidth will be filled for all
2200          * non-satellite systems, as tuners need to know what
2201          * low pass/Nyquist half filter should be applied, in
2202          * order to avoid inter-channel noise.
2203          *
2204          * ISDB-T and DVB-T/T2 already sets bandwidth.
2205          * ATSC and DVB-C don't set, so, the core should fill it.
2206          *
2207          * On DVB-C Annex A and C, the bandwidth is a function of
2208          * the roll-off and symbol rate. Annex B defines different
2209          * roll-off factors depending on the modulation. Fortunately,
2210          * Annex B is only used with 6MHz, so there's no need to
2211          * calculate it.
2212          *
2213          * While not officially supported, a side effect of handling it at
2214          * the cache level is that a program could retrieve the bandwidth
2215          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2216          */
2217         switch (c->delivery_system) {
2218         case SYS_ATSC:
2219         case SYS_DVBC_ANNEX_B:
2220                 c->bandwidth_hz = 6000000;
2221                 break;
2222         case SYS_DVBC_ANNEX_A:
2223                 rolloff = 115;
2224                 break;
2225         case SYS_DVBC_ANNEX_C:
2226                 rolloff = 113;
2227                 break;
2228         case SYS_DVBS:
2229         case SYS_TURBO:
2230         case SYS_ISDBS:
2231                 rolloff = 135;
2232                 break;
2233         case SYS_DVBS2:
2234                 switch (c->rolloff) {
2235                 case ROLLOFF_20:
2236                         rolloff = 120;
2237                         break;
2238                 case ROLLOFF_25:
2239                         rolloff = 125;
2240                         break;
2241                 default:
2242                 case ROLLOFF_35:
2243                         rolloff = 135;
2244                 }
2245                 break;
2246         default:
2247                 break;
2248         }
2249         if (rolloff)
2250                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2251 
2252         /* force auto frequency inversion if requested */
2253         if (dvb_force_auto_inversion)
2254                 c->inversion = INVERSION_AUTO;
2255 
2256         /*
2257          * without hierarchical coding code_rate_LP is irrelevant,
2258          * so we tolerate the otherwise invalid FEC_NONE setting
2259          */
2260         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2261                 c->code_rate_LP = FEC_AUTO;
2262 
2263         /* get frontend-specific tuning settings */
2264         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2265         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2266                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2267                 fepriv->max_drift = fetunesettings.max_drift;
2268                 fepriv->step_size = fetunesettings.step_size;
2269         } else {
2270                 /* default values */
2271                 switch (c->delivery_system) {
2272                 case SYS_DVBS:
2273                 case SYS_DVBS2:
2274                 case SYS_ISDBS:
2275                 case SYS_TURBO:
2276                 case SYS_DVBC_ANNEX_A:
2277                 case SYS_DVBC_ANNEX_C:
2278                         fepriv->min_delay = HZ / 20;
2279                         fepriv->step_size = c->symbol_rate / 16000;
2280                         fepriv->max_drift = c->symbol_rate / 2000;
2281                         break;
2282                 case SYS_DVBT:
2283                 case SYS_DVBT2:
2284                 case SYS_ISDBT:
2285                 case SYS_DTMB:
2286                         fepriv->min_delay = HZ / 20;
2287                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
2288                         fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
2289                         break;
2290                 default:
2291                         /*
2292                          * FIXME: This sounds wrong! if freqency_stepsize is
2293                          * defined by the frontend, why not use it???
2294                          */
2295                         fepriv->min_delay = HZ / 20;
2296                         fepriv->step_size = 0; /* no zigzag */
2297                         fepriv->max_drift = 0;
2298                         break;
2299                 }
2300         }
2301         if (dvb_override_tune_delay > 0)
2302                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2303 
2304         fepriv->state = FESTATE_RETUNE;
2305 
2306         /* Request the search algorithm to search */
2307         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2308 
2309         dvb_frontend_clear_events(fe);
2310         dvb_frontend_add_event(fe, 0);
2311         dvb_frontend_wakeup(fe);
2312         fepriv->status = 0;
2313 
2314         return 0;
2315 }
2316 
2317 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2318                             struct dtv_properties *tvps)
2319 {
2320         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2321         struct dtv_property *tvp = NULL;
2322         struct dtv_frontend_properties getp;
2323         int i, err;
2324 
2325         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2326 
2327         dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2328                 __func__, tvps->num);
2329         dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2330                 __func__, tvps->props);
2331 
2332         /*
2333          * Put an arbitrary limit on the number of messages that can
2334          * be sent at once
2335          */
2336         if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2337                 return -EINVAL;
2338 
2339         tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2340         if (IS_ERR(tvp))
2341                 return PTR_ERR(tvp);
2342 
2343         /*
2344          * Let's use our own copy of property cache, in order to
2345          * avoid mangling with DTV zigzag logic, as drivers might
2346          * return crap, if they don't check if the data is available
2347          * before updating the properties cache.
2348          */
2349         if (fepriv->state != FESTATE_IDLE) {
2350                 err = dtv_get_frontend(fe, &getp, NULL);
2351                 if (err < 0)
2352                         goto out;
2353         }
2354         for (i = 0; i < tvps->num; i++) {
2355                 err = dtv_property_process_get(fe, &getp,
2356                                                tvp + i, file);
2357                 if (err < 0)
2358                         goto out;
2359         }
2360 
2361         if (copy_to_user((void __user *)tvps->props, tvp,
2362                          tvps->num * sizeof(struct dtv_property))) {
2363                 err = -EFAULT;
2364                 goto out;
2365         }
2366 
2367         err = 0;
2368 out:
2369         kfree(tvp);
2370         return err;
2371 }
2372 
2373 static int dvb_get_frontend(struct dvb_frontend *fe,
2374                             struct dvb_frontend_parameters *p_out)
2375 {
2376         struct dtv_frontend_properties getp;
2377 
2378         /*
2379          * Let's use our own copy of property cache, in order to
2380          * avoid mangling with DTV zigzag logic, as drivers might
2381          * return crap, if they don't check if the data is available
2382          * before updating the properties cache.
2383          */
2384         memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2385 
2386         return dtv_get_frontend(fe, &getp, p_out);
2387 }
2388 
2389 static int dvb_frontend_handle_ioctl(struct file *file,
2390                                      unsigned int cmd, void *parg)
2391 {
2392         struct dvb_device *dvbdev = file->private_data;
2393         struct dvb_frontend *fe = dvbdev->priv;
2394         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2395         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2396         int i, err = -ENOTSUPP;
2397 
2398         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2399 
2400         switch (cmd) {
2401         case FE_SET_PROPERTY: {
2402                 struct dtv_properties *tvps = parg;
2403                 struct dtv_property *tvp = NULL;
2404 
2405                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2406                         __func__, tvps->num);
2407                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2408                         __func__, tvps->props);
2409 
2410                 /*
2411                  * Put an arbitrary limit on the number of messages that can
2412                  * be sent at once
2413                  */
2414                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2415                         return -EINVAL;
2416 
2417                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2418                 if (IS_ERR(tvp))
2419                         return PTR_ERR(tvp);
2420 
2421                 for (i = 0; i < tvps->num; i++) {
2422                         err = dtv_property_process_set(fe, file,
2423                                                        (tvp + i)->cmd,
2424                                                        (tvp + i)->u.data);
2425                         if (err < 0) {
2426                                 kfree(tvp);
2427                                 return err;
2428                         }
2429                 }
2430                 kfree(tvp);
2431                 err = 0;
2432                 break;
2433         }
2434         case FE_GET_PROPERTY:
2435                 err = dvb_get_property(fe, file, parg);
2436                 break;
2437 
2438         case FE_GET_INFO: {
2439                 struct dvb_frontend_info *info = parg;
2440                 memset(info, 0, sizeof(*info));
2441 
2442                 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2443                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2444                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2445                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2446                 info->caps = fe->ops.info.caps;
2447                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2448                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2449                                                   &info->frequency_max,
2450                                                   &info->frequency_tolerance);
2451 
2452                 /*
2453                  * Associate the 4 delivery systems supported by DVBv3
2454                  * API with their DVBv5 counterpart. For the other standards,
2455                  * use the closest type, assuming that it would hopefully
2456                  * work with a DVBv3 application.
2457                  * It should be noticed that, on multi-frontend devices with
2458                  * different types (terrestrial and cable, for example),
2459                  * a pure DVBv3 application won't be able to use all delivery
2460                  * systems. Yet, changing the DVBv5 cache to the other delivery
2461                  * system should be enough for making it work.
2462                  */
2463                 switch (dvbv3_type(c->delivery_system)) {
2464                 case DVBV3_QPSK:
2465                         info->type = FE_QPSK;
2466                         break;
2467                 case DVBV3_ATSC:
2468                         info->type = FE_ATSC;
2469                         break;
2470                 case DVBV3_QAM:
2471                         info->type = FE_QAM;
2472                         break;
2473                 case DVBV3_OFDM:
2474                         info->type = FE_OFDM;
2475                         break;
2476                 default:
2477                         dev_err(fe->dvb->device,
2478                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2479                                 __func__, c->delivery_system);
2480                         info->type = FE_OFDM;
2481                 }
2482                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2483                         __func__, c->delivery_system, info->type);
2484 
2485                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2486                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2487                         info->caps |= FE_CAN_INVERSION_AUTO;
2488                 err = 0;
2489                 break;
2490         }
2491 
2492         case FE_READ_STATUS: {
2493                 enum fe_status *status = parg;
2494 
2495                 /* if retune was requested but hasn't occurred yet, prevent
2496                  * that user get signal state from previous tuning */
2497                 if (fepriv->state == FESTATE_RETUNE ||
2498                     fepriv->state == FESTATE_ERROR) {
2499                         err = 0;
2500                         *status = 0;
2501                         break;
2502                 }
2503 
2504                 if (fe->ops.read_status)
2505                         err = fe->ops.read_status(fe, status);
2506                 break;
2507         }
2508 
2509         case FE_DISEQC_RESET_OVERLOAD:
2510                 if (fe->ops.diseqc_reset_overload) {
2511                         err = fe->ops.diseqc_reset_overload(fe);
2512                         fepriv->state = FESTATE_DISEQC;
2513                         fepriv->status = 0;
2514                 }
2515                 break;
2516 
2517         case FE_DISEQC_SEND_MASTER_CMD:
2518                 if (fe->ops.diseqc_send_master_cmd) {
2519                         struct dvb_diseqc_master_cmd *cmd = parg;
2520 
2521                         if (cmd->msg_len > sizeof(cmd->msg)) {
2522                                 err = -EINVAL;
2523                                 break;
2524                         }
2525                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2526                         fepriv->state = FESTATE_DISEQC;
2527                         fepriv->status = 0;
2528                 }
2529                 break;
2530 
2531         case FE_DISEQC_SEND_BURST:
2532                 if (fe->ops.diseqc_send_burst) {
2533                         err = fe->ops.diseqc_send_burst(fe,
2534                                                 (enum fe_sec_mini_cmd)parg);
2535                         fepriv->state = FESTATE_DISEQC;
2536                         fepriv->status = 0;
2537                 }
2538                 break;
2539 
2540         case FE_SET_TONE:
2541                 if (fe->ops.set_tone) {
2542                         err = fe->ops.set_tone(fe,
2543                                                (enum fe_sec_tone_mode)parg);
2544                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2545                         fepriv->state = FESTATE_DISEQC;
2546                         fepriv->status = 0;
2547                 }
2548                 break;
2549 
2550         case FE_SET_VOLTAGE:
2551                 if (fe->ops.set_voltage) {
2552                         err = fe->ops.set_voltage(fe,
2553                                                   (enum fe_sec_voltage)parg);
2554                         fepriv->voltage = (enum fe_sec_voltage)parg;
2555                         fepriv->state = FESTATE_DISEQC;
2556                         fepriv->status = 0;
2557                 }
2558                 break;
2559 
2560         case FE_DISEQC_RECV_SLAVE_REPLY:
2561                 if (fe->ops.diseqc_recv_slave_reply)
2562                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2563                 break;
2564 
2565         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2566                 if (fe->ops.enable_high_lnb_voltage)
2567                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2568                 break;
2569 
2570         case FE_SET_FRONTEND_TUNE_MODE:
2571                 fepriv->tune_mode_flags = (unsigned long)parg;
2572                 err = 0;
2573                 break;
2574         /* DEPRECATED dish control ioctls */
2575 
2576         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2577                 if (fe->ops.dishnetwork_send_legacy_command) {
2578                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2579                                                          (unsigned long)parg);
2580                         fepriv->state = FESTATE_DISEQC;
2581                         fepriv->status = 0;
2582                 } else if (fe->ops.set_voltage) {
2583                         /*
2584                          * NOTE: This is a fallback condition.  Some frontends
2585                          * (stv0299 for instance) take longer than 8msec to
2586                          * respond to a set_voltage command.  Those switches
2587                          * need custom routines to switch properly.  For all
2588                          * other frontends, the following should work ok.
2589                          * Dish network legacy switches (as used by Dish500)
2590                          * are controlled by sending 9-bit command words
2591                          * spaced 8msec apart.
2592                          * the actual command word is switch/port dependent
2593                          * so it is up to the userspace application to send
2594                          * the right command.
2595                          * The command must always start with a '0' after
2596                          * initialization, so parg is 8 bits and does not
2597                          * include the initialization or start bit
2598                          */
2599                         unsigned long swcmd = ((unsigned long)parg) << 1;
2600                         ktime_t nexttime;
2601                         ktime_t tv[10];
2602                         int i;
2603                         u8 last = 1;
2604 
2605                         if (dvb_frontend_debug)
2606                                 dprintk("switch command: 0x%04lx\n",
2607                                         swcmd);
2608                         nexttime = ktime_get_boottime();
2609                         if (dvb_frontend_debug)
2610                                 tv[0] = nexttime;
2611                         /* before sending a command, initialize by sending
2612                          * a 32ms 18V to the switch
2613                          */
2614                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2615                         dvb_frontend_sleep_until(&nexttime, 32000);
2616 
2617                         for (i = 0; i < 9; i++) {
2618                                 if (dvb_frontend_debug)
2619                                         tv[i + 1] = ktime_get_boottime();
2620                                 if ((swcmd & 0x01) != last) {
2621                                         /* set voltage to (last ? 13V : 18V) */
2622                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2623                                         last = (last) ? 0 : 1;
2624                                 }
2625                                 swcmd = swcmd >> 1;
2626                                 if (i != 8)
2627                                         dvb_frontend_sleep_until(&nexttime, 8000);
2628                         }
2629                         if (dvb_frontend_debug) {
2630                                 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2631                                         fe->dvb->num);
2632                                 for (i = 1; i < 10; i++)
2633                                         pr_info("%d: %d\n", i,
2634                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2635                         }
2636                         err = 0;
2637                         fepriv->state = FESTATE_DISEQC;
2638                         fepriv->status = 0;
2639                 }
2640                 break;
2641 
2642         /* DEPRECATED statistics ioctls */
2643 
2644         case FE_READ_BER:
2645                 if (fe->ops.read_ber) {
2646                         if (fepriv->thread)
2647                                 err = fe->ops.read_ber(fe, parg);
2648                         else
2649                                 err = -EAGAIN;
2650                 }
2651                 break;
2652 
2653         case FE_READ_SIGNAL_STRENGTH:
2654                 if (fe->ops.read_signal_strength) {
2655                         if (fepriv->thread)
2656                                 err = fe->ops.read_signal_strength(fe, parg);
2657                         else
2658                                 err = -EAGAIN;
2659                 }
2660                 break;
2661 
2662         case FE_READ_SNR:
2663                 if (fe->ops.read_snr) {
2664                         if (fepriv->thread)
2665                                 err = fe->ops.read_snr(fe, parg);
2666                         else
2667                                 err = -EAGAIN;
2668                 }
2669                 break;
2670 
2671         case FE_READ_UNCORRECTED_BLOCKS:
2672                 if (fe->ops.read_ucblocks) {
2673                         if (fepriv->thread)
2674                                 err = fe->ops.read_ucblocks(fe, parg);
2675                         else
2676                                 err = -EAGAIN;
2677                 }
2678                 break;
2679 
2680         /* DEPRECATED DVBv3 ioctls */
2681 
2682         case FE_SET_FRONTEND:
2683                 err = dvbv3_set_delivery_system(fe);
2684                 if (err)
2685                         break;
2686 
2687                 err = dtv_property_cache_sync(fe, c, parg);
2688                 if (err)
2689                         break;
2690                 err = dtv_set_frontend(fe);
2691                 break;
2692 
2693         case FE_GET_EVENT:
2694                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2695                 break;
2696 
2697         case FE_GET_FRONTEND:
2698                 err = dvb_get_frontend(fe, parg);
2699                 break;
2700 
2701         default:
2702                 return -ENOTSUPP;
2703         } /* switch */
2704 
2705         return err;
2706 }
2707 
2708 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2709 {
2710         struct dvb_device *dvbdev = file->private_data;
2711         struct dvb_frontend *fe = dvbdev->priv;
2712         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2713 
2714         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2715 
2716         poll_wait(file, &fepriv->events.wait_queue, wait);
2717 
2718         if (fepriv->events.eventw != fepriv->events.eventr)
2719                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2720 
2721         return 0;
2722 }
2723 
2724 static int dvb_frontend_open(struct inode *inode, struct file *file)
2725 {
2726         struct dvb_device *dvbdev = file->private_data;
2727         struct dvb_frontend *fe = dvbdev->priv;
2728         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2729         struct dvb_adapter *adapter = fe->dvb;
2730         int ret;
2731 
2732         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2733         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2734                 return -ENODEV;
2735 
2736         if (adapter->mfe_shared) {
2737                 mutex_lock(&adapter->mfe_lock);
2738 
2739                 if (!adapter->mfe_dvbdev)
2740                         adapter->mfe_dvbdev = dvbdev;
2741 
2742                 else if (adapter->mfe_dvbdev != dvbdev) {
2743                         struct dvb_device
2744                                 *mfedev = adapter->mfe_dvbdev;
2745                         struct dvb_frontend
2746                                 *mfe = mfedev->priv;
2747                         struct dvb_frontend_private
2748                                 *mfepriv = mfe->frontend_priv;
2749                         int mferetry = (dvb_mfe_wait_time << 1);
2750 
2751                         mutex_unlock(&adapter->mfe_lock);
2752                         while (mferetry-- && (mfedev->users != -1 ||
2753                                               mfepriv->thread)) {
2754                                 if (msleep_interruptible(500)) {
2755                                         if (signal_pending(current))
2756                                                 return -EINTR;
2757                                 }
2758                         }
2759 
2760                         mutex_lock(&adapter->mfe_lock);
2761                         if (adapter->mfe_dvbdev != dvbdev) {
2762                                 mfedev = adapter->mfe_dvbdev;
2763                                 mfe = mfedev->priv;
2764                                 mfepriv = mfe->frontend_priv;
2765                                 if (mfedev->users != -1 ||
2766                                     mfepriv->thread) {
2767                                         mutex_unlock(&adapter->mfe_lock);
2768                                         return -EBUSY;
2769                                 }
2770                                 adapter->mfe_dvbdev = dvbdev;
2771                         }
2772                 }
2773         }
2774 
2775         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2776                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2777                         goto err0;
2778 
2779                 /* If we took control of the bus, we need to force
2780                    reinitialization.  This is because many ts_bus_ctrl()
2781                    functions strobe the RESET pin on the demod, and if the
2782                    frontend thread already exists then the dvb_init() routine
2783                    won't get called (which is what usually does initial
2784                    register configuration). */
2785                 fepriv->reinitialise = 1;
2786         }
2787 
2788         if ((ret = dvb_generic_open(inode, file)) < 0)
2789                 goto err1;
2790 
2791         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2792                 /* normal tune mode when opened R/W */
2793                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2794                 fepriv->tone = -1;
2795                 fepriv->voltage = -1;
2796 
2797 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2798                 mutex_lock(&fe->dvb->mdev_lock);
2799                 if (fe->dvb->mdev) {
2800                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2801                         if (fe->dvb->mdev->enable_source)
2802                                 ret = fe->dvb->mdev->enable_source(
2803                                                            dvbdev->entity,
2804                                                            &fepriv->pipe);
2805                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2806                         if (ret) {
2807                                 mutex_unlock(&fe->dvb->mdev_lock);
2808                                 dev_err(fe->dvb->device,
2809                                         "Tuner is busy. Error %d\n", ret);
2810                                 goto err2;
2811                         }
2812                 }
2813                 mutex_unlock(&fe->dvb->mdev_lock);
2814 #endif
2815                 ret = dvb_frontend_start(fe);
2816                 if (ret)
2817                         goto err3;
2818 
2819                 /*  empty event queue */
2820                 fepriv->events.eventr = fepriv->events.eventw = 0;
2821         }
2822 
2823         dvb_frontend_get(fe);
2824 
2825         if (adapter->mfe_shared)
2826                 mutex_unlock(&adapter->mfe_lock);
2827         return ret;
2828 
2829 err3:
2830 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2831         mutex_lock(&fe->dvb->mdev_lock);
2832         if (fe->dvb->mdev) {
2833                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2834                 if (fe->dvb->mdev->disable_source)
2835                         fe->dvb->mdev->disable_source(dvbdev->entity);
2836                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2837         }
2838         mutex_unlock(&fe->dvb->mdev_lock);
2839 err2:
2840 #endif
2841         dvb_generic_release(inode, file);
2842 err1:
2843         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2844                 fe->ops.ts_bus_ctrl(fe, 0);
2845 err0:
2846         if (adapter->mfe_shared)
2847                 mutex_unlock(&adapter->mfe_lock);
2848         return ret;
2849 }
2850 
2851 static int dvb_frontend_release(struct inode *inode, struct file *file)
2852 {
2853         struct dvb_device *dvbdev = file->private_data;
2854         struct dvb_frontend *fe = dvbdev->priv;
2855         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2856         int ret;
2857 
2858         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2859 
2860         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2861                 fepriv->release_jiffies = jiffies;
2862                 mb();
2863         }
2864 
2865         ret = dvb_generic_release(inode, file);
2866 
2867         if (dvbdev->users == -1) {
2868                 wake_up(&fepriv->wait_queue);
2869 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2870                 mutex_lock(&fe->dvb->mdev_lock);
2871                 if (fe->dvb->mdev) {
2872                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2873                         if (fe->dvb->mdev->disable_source)
2874                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2875                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2876                 }
2877                 mutex_unlock(&fe->dvb->mdev_lock);
2878 #endif
2879                 if (fe->exit != DVB_FE_NO_EXIT)
2880                         wake_up(&dvbdev->wait_queue);
2881                 if (fe->ops.ts_bus_ctrl)
2882                         fe->ops.ts_bus_ctrl(fe, 0);
2883         }
2884 
2885         dvb_frontend_put(fe);
2886 
2887         return ret;
2888 }
2889 
2890 static const struct file_operations dvb_frontend_fops = {
2891         .owner          = THIS_MODULE,
2892         .unlocked_ioctl = dvb_frontend_ioctl,
2893 #ifdef CONFIG_COMPAT
2894         .compat_ioctl   = dvb_frontend_compat_ioctl,
2895 #endif
2896         .poll           = dvb_frontend_poll,
2897         .open           = dvb_frontend_open,
2898         .release        = dvb_frontend_release,
2899         .llseek         = noop_llseek,
2900 };
2901 
2902 int dvb_frontend_suspend(struct dvb_frontend *fe)
2903 {
2904         int ret = 0;
2905 
2906         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2907                 fe->id);
2908 
2909         if (fe->ops.tuner_ops.suspend)
2910                 ret = fe->ops.tuner_ops.suspend(fe);
2911         else if (fe->ops.tuner_ops.sleep)
2912                 ret = fe->ops.tuner_ops.sleep(fe);
2913 
2914         if (fe->ops.sleep)
2915                 ret = fe->ops.sleep(fe);
2916 
2917         return ret;
2918 }
2919 EXPORT_SYMBOL(dvb_frontend_suspend);
2920 
2921 int dvb_frontend_resume(struct dvb_frontend *fe)
2922 {
2923         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2924         int ret = 0;
2925 
2926         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2927                 fe->id);
2928 
2929         fe->exit = DVB_FE_DEVICE_RESUME;
2930         if (fe->ops.init)
2931                 ret = fe->ops.init(fe);
2932 
2933         if (fe->ops.tuner_ops.resume)
2934                 ret = fe->ops.tuner_ops.resume(fe);
2935         else if (fe->ops.tuner_ops.init)
2936                 ret = fe->ops.tuner_ops.init(fe);
2937 
2938         if (fe->ops.set_tone && fepriv->tone != -1)
2939                 fe->ops.set_tone(fe, fepriv->tone);
2940         if (fe->ops.set_voltage && fepriv->voltage != -1)
2941                 fe->ops.set_voltage(fe, fepriv->voltage);
2942 
2943         fe->exit = DVB_FE_NO_EXIT;
2944         fepriv->state = FESTATE_RETUNE;
2945         dvb_frontend_wakeup(fe);
2946 
2947         return ret;
2948 }
2949 EXPORT_SYMBOL(dvb_frontend_resume);
2950 
2951 int dvb_register_frontend(struct dvb_adapter *dvb,
2952                           struct dvb_frontend *fe)
2953 {
2954         struct dvb_frontend_private *fepriv;
2955         const struct dvb_device dvbdev_template = {
2956                 .users = ~0,
2957                 .writers = 1,
2958                 .readers = (~0) - 1,
2959                 .fops = &dvb_frontend_fops,
2960 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2961                 .name = fe->ops.info.name,
2962 #endif
2963         };
2964 
2965         dev_dbg(dvb->device, "%s:\n", __func__);
2966 
2967         if (mutex_lock_interruptible(&frontend_mutex))
2968                 return -ERESTARTSYS;
2969 
2970         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2971         if (!fe->frontend_priv) {
2972                 mutex_unlock(&frontend_mutex);
2973                 return -ENOMEM;
2974         }
2975         fepriv = fe->frontend_priv;
2976 
2977         kref_init(&fe->refcount);
2978 
2979         /*
2980          * After initialization, there need to be two references: one
2981          * for dvb_unregister_frontend(), and another one for
2982          * dvb_frontend_detach().
2983          */
2984         dvb_frontend_get(fe);
2985 
2986         sema_init(&fepriv->sem, 1);
2987         init_waitqueue_head(&fepriv->wait_queue);
2988         init_waitqueue_head(&fepriv->events.wait_queue);
2989         mutex_init(&fepriv->events.mtx);
2990         fe->dvb = dvb;
2991         fepriv->inversion = INVERSION_OFF;
2992 
2993         dev_info(fe->dvb->device,
2994                  "DVB: registering adapter %i frontend %i (%s)...\n",
2995                  fe->dvb->num, fe->id, fe->ops.info.name);
2996 
2997         dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2998                             fe, DVB_DEVICE_FRONTEND, 0);
2999 
3000         /*
3001          * Initialize the cache to the proper values according with the
3002          * first supported delivery system (ops->delsys[0])
3003          */
3004 
3005         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3006         dvb_frontend_clear_cache(fe);
3007 
3008         mutex_unlock(&frontend_mutex);
3009         return 0;
3010 }
3011 EXPORT_SYMBOL(dvb_register_frontend);
3012 
3013 int dvb_unregister_frontend(struct dvb_frontend *fe)
3014 {
3015         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3016 
3017         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3018 
3019         mutex_lock(&frontend_mutex);
3020         dvb_frontend_stop(fe);
3021         dvb_remove_device(fepriv->dvbdev);
3022 
3023         /* fe is invalid now */
3024         mutex_unlock(&frontend_mutex);
3025         dvb_frontend_put(fe);
3026         return 0;
3027 }
3028 EXPORT_SYMBOL(dvb_unregister_frontend);
3029 
3030 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3031                                         void (*release)(struct dvb_frontend *fe))
3032 {
3033         if (release) {
3034                 release(fe);
3035 #ifdef CONFIG_MEDIA_ATTACH
3036                 dvb_detach(release);
3037 #endif
3038         }
3039 }
3040 
3041 void dvb_frontend_detach(struct dvb_frontend *fe)
3042 {
3043         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3044         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3045         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3046         dvb_frontend_put(fe);
3047 }
3048 EXPORT_SYMBOL(dvb_frontend_detach);