drivers/media/dvb-core/dvb_frontend.c

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