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