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_device_put(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                 struct wait_queue_entry wait;
 308                 int ret = 0;
 309
 310                 if (flags & O_NONBLOCK)
 311                         return -EWOULDBLOCK;
 312
 313                 init_waitqueue_entry(&wait, current);
 314                 add_wait_queue(&events->wait_queue, &wait);
 315                 while (!dvb_frontend_test_event(fepriv, events)) {
 316                         wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
 317                         if (signal_pending(current)) {
 318                                 ret = -ERESTARTSYS;
 319                                 break;
 320                         }
 321                 }
 322                 remove_wait_queue(&events->wait_queue, &wait);
 323                 if (ret < 0)
 324                         return ret;
 325         }
 326
 327         mutex_lock(&events->mtx);
 328         *event = events->events[events->eventr];
 329         events->eventr = (events->eventr + 1) % MAX_EVENT;
 330         mutex_unlock(&events->mtx);
 331
 332         return 0;
 333 }
 334
 335 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 336 {
 337         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 338         struct dvb_fe_events *events = &fepriv->events;
 339
 340         mutex_lock(&events->mtx);
 341         events->eventr = events->eventw;
 342         mutex_unlock(&events->mtx);
 343 }
 344
 345 static void dvb_frontend_init(struct dvb_frontend *fe)
 346 {
 347         dev_dbg(fe->dvb->device,
 348                 "%s: initialising adapter %i frontend %i (%s)...\n",
 349                 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 350
 351         if (fe->ops.init)
 352                 fe->ops.init(fe);
 353         if (fe->ops.tuner_ops.init) {
 354                 if (fe->ops.i2c_gate_ctrl)
 355                         fe->ops.i2c_gate_ctrl(fe, 1);
 356                 fe->ops.tuner_ops.init(fe);
 357                 if (fe->ops.i2c_gate_ctrl)
 358                         fe->ops.i2c_gate_ctrl(fe, 0);
 359         }
 360 }
 361
 362 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 363 {
 364         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 365
 366         fepriv->reinitialise = 1;
 367         dvb_frontend_wakeup(fe);
 368 }
 369 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 370
 371 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 372 {
 373         int q2;
 374         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 375
 376         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 377
 378         if (locked)
 379                 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
 380         else
 381                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 382
 383         q2 = fepriv->quality - 128;
 384         q2 *= q2;
 385
 386         fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
 387 }
 388
 389 /**
 390  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
 391  *      parameters.
 392  *
 393  * @fe: The frontend concerned.
 394  * @check_wrapped: Checks if an iteration has completed.
 395  *                 DO NOT SET ON THE FIRST ATTEMPT.
 396  *
 397  * return: Number of complete iterations that have been performed.
 398  */
 399 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 400 {
 401         int autoinversion;
 402         int ready = 0;
 403         int fe_set_err = 0;
 404         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 405         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 406         int original_inversion = c->inversion;
 407         u32 original_frequency = c->frequency;
 408
 409         /* are we using autoinversion? */
 410         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 411                          (c->inversion == INVERSION_AUTO));
 412
 413         /* setup parameters correctly */
 414         while (!ready) {
 415                 /* calculate the lnb_drift */
 416                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 417
 418                 /* wrap the auto_step if we've exceeded the maximum drift */
 419                 if (fepriv->lnb_drift > fepriv->max_drift) {
 420                         fepriv->auto_step = 0;
 421                         fepriv->auto_sub_step = 0;
 422                         fepriv->lnb_drift = 0;
 423                 }
 424
 425                 /* perform inversion and +/- zigzag */
 426                 switch (fepriv->auto_sub_step) {
 427                 case 0:
 428                         /* try with the current inversion and current drift setting */
 429                         ready = 1;
 430                         break;
 431
 432                 case 1:
 433                         if (!autoinversion) break;
 434
 435                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 436                         ready = 1;
 437                         break;
 438
 439                 case 2:
 440                         if (fepriv->lnb_drift == 0) break;
 441
 442                         fepriv->lnb_drift = -fepriv->lnb_drift;
 443                         ready = 1;
 444                         break;
 445
 446                 case 3:
 447                         if (fepriv->lnb_drift == 0) break;
 448                         if (!autoinversion) break;
 449
 450                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 451                         fepriv->lnb_drift = -fepriv->lnb_drift;
 452                         ready = 1;
 453                         break;
 454
 455                 default:
 456                         fepriv->auto_step++;
 457                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 458                         break;
 459                 }
 460
 461                 if (!ready) fepriv->auto_sub_step++;
 462         }
 463
 464         /* if this attempt would hit where we started, indicate a complete
 465          * iteration has occurred */
 466         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 467             (fepriv->auto_sub_step == 0) && check_wrapped) {
 468                 return 1;
 469         }
 470
 471         dev_dbg(fe->dvb->device,
 472                 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
 473                 __func__, fepriv->lnb_drift, fepriv->inversion,
 474                 fepriv->auto_step, fepriv->auto_sub_step,
 475                 fepriv->started_auto_step);
 476
 477         /* set the frontend itself */
 478         c->frequency += fepriv->lnb_drift;
 479         if (autoinversion)
 480                 c->inversion = fepriv->inversion;
 481         tmp = *c;
 482         if (fe->ops.set_frontend)
 483                 fe_set_err = fe->ops.set_frontend(fe);
 484         *c = tmp;
 485         if (fe_set_err < 0) {
 486                 fepriv->state = FESTATE_ERROR;
 487                 return fe_set_err;
 488         }
 489
 490         c->frequency = original_frequency;
 491         c->inversion = original_inversion;
 492
 493         fepriv->auto_sub_step++;
 494         return 0;
 495 }
 496
 497 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 498 {
 499         enum fe_status s = FE_NONE;
 500         int retval = 0;
 501         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 502         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 503
 504         /* if we've got no parameters, just keep idling */
 505         if (fepriv->state & FESTATE_IDLE) {
 506                 fepriv->delay = 3 * HZ;
 507                 fepriv->quality = 0;
 508                 return;
 509         }
 510
 511         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 512         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 513                 if (fepriv->state & FESTATE_RETUNE) {
 514                         tmp = *c;
 515                         if (fe->ops.set_frontend)
 516                                 retval = fe->ops.set_frontend(fe);
 517                         *c = tmp;
 518                         if (retval < 0)
 519                                 fepriv->state = FESTATE_ERROR;
 520                         else
 521                                 fepriv->state = FESTATE_TUNED;
 522                 }
 523                 fepriv->delay = 3 * HZ;
 524                 fepriv->quality = 0;
 525                 return;
 526         }
 527
 528         /* get the frontend status */
 529         if (fepriv->state & FESTATE_RETUNE) {
 530                 s = 0;
 531         } else {
 532                 if (fe->ops.read_status)
 533                         fe->ops.read_status(fe, &s);
 534                 if (s != fepriv->status) {
 535                         dvb_frontend_add_event(fe, s);
 536                         fepriv->status = s;
 537                 }
 538         }
 539
 540         /* if we're not tuned, and we have a lock, move to the TUNED state */
 541         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 542                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 543                 fepriv->state = FESTATE_TUNED;
 544
 545                 /* if we're tuned, then we have determined the correct inversion */
 546                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 547                     (c->inversion == INVERSION_AUTO)) {
 548                         c->inversion = fepriv->inversion;
 549                 }
 550                 return;
 551         }
 552
 553         /* if we are tuned already, check we're still locked */
 554         if (fepriv->state & FESTATE_TUNED) {
 555                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 556
 557                 /* we're tuned, and the lock is still good... */
 558                 if (s & FE_HAS_LOCK) {
 559                         return;
 560                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 561                         fepriv->state = FESTATE_ZIGZAG_FAST;
 562                         fepriv->started_auto_step = fepriv->auto_step;
 563                         fepriv->check_wrapped = 0;
 564                 }
 565         }
 566
 567         /* don't actually do anything if we're in the LOSTLOCK state,
 568          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 569         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 570             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 571                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 572                 return;
 573         }
 574
 575         /* don't do anything if we're in the DISEQC state, since this
 576          * might be someone with a motorized dish controlled by DISEQC.
 577          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 578         if (fepriv->state & FESTATE_DISEQC) {
 579                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 580                 return;
 581         }
 582
 583         /* if we're in the RETUNE state, set everything up for a brand
 584          * new scan, keeping the current inversion setting, as the next
 585          * tune is _very_ likely to require the same */
 586         if (fepriv->state & FESTATE_RETUNE) {
 587                 fepriv->lnb_drift = 0;
 588                 fepriv->auto_step = 0;
 589                 fepriv->auto_sub_step = 0;
 590                 fepriv->started_auto_step = 0;
 591                 fepriv->check_wrapped = 0;
 592         }
 593
 594         /* fast zigzag. */
 595         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 596                 fepriv->delay = fepriv->min_delay;
 597
 598                 /* perform a tune */
 599                 retval = dvb_frontend_swzigzag_autotune(fe,
 600                                                         fepriv->check_wrapped);
 601                 if (retval < 0) {
 602                         return;
 603                 } else if (retval) {
 604                         /* OK, if we've run out of trials at the fast speed.
 605                          * Drop back to slow for the _next_ attempt */
 606                         fepriv->state = FESTATE_SEARCHING_SLOW;
 607                         fepriv->started_auto_step = fepriv->auto_step;
 608                         return;
 609                 }
 610                 fepriv->check_wrapped = 1;
 611
 612                 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
 613                  * This ensures we cannot return from an
 614                  * FE_SET_FRONTEND ioctl before the first frontend tune
 615                  * occurs */
 616                 if (fepriv->state & FESTATE_RETUNE) {
 617                         fepriv->state = FESTATE_TUNING_FAST;
 618                 }
 619         }
 620
 621         /* slow zigzag */
 622         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 623                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 624
 625                 /* Note: don't bother checking for wrapping; we stay in this
 626                  * state until we get a lock */
 627                 dvb_frontend_swzigzag_autotune(fe, 0);
 628         }
 629 }
 630
 631 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 632 {
 633         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 634
 635         if (fe->exit != DVB_FE_NO_EXIT)
 636                 return 1;
 637
 638         if (fepriv->dvbdev->writers == 1)
 639                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 640                                   dvb_shutdown_timeout * HZ))
 641                         return 1;
 642
 643         return 0;
 644 }
 645
 646 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 647 {
 648         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 649
 650         if (fepriv->wakeup) {
 651                 fepriv->wakeup = 0;
 652                 return 1;
 653         }
 654         return dvb_frontend_is_exiting(fe);
 655 }
 656
 657 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 658 {
 659         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 660
 661         fepriv->wakeup = 1;
 662         wake_up_interruptible(&fepriv->wait_queue);
 663 }
 664
 665 static int dvb_frontend_thread(void *data)
 666 {
 667         struct dvb_frontend *fe = data;
 668         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 669         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 670         enum fe_status s = FE_NONE;
 671         enum dvbfe_algo algo;
 672         bool re_tune = false;
 673         bool semheld = false;
 674
 675         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 676
 677         fepriv->check_wrapped = 0;
 678         fepriv->quality = 0;
 679         fepriv->delay = 3 * HZ;
 680         fepriv->status = 0;
 681         fepriv->wakeup = 0;
 682         fepriv->reinitialise = 0;
 683
 684         dvb_frontend_init(fe);
 685
 686         set_freezable();
 687         while (1) {
 688                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 689 restart:
 690                 wait_event_interruptible_timeout(fepriv->wait_queue,
 691                                                  dvb_frontend_should_wakeup(fe) ||
 692                                                  kthread_should_stop() ||
 693                                                  freezing(current),
 694                         fepriv->delay);
 695
 696                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 697                         /* got signal or quitting */
 698                         if (!down_interruptible(&fepriv->sem))
 699                                 semheld = true;
 700                         fe->exit = DVB_FE_NORMAL_EXIT;
 701                         break;
 702                 }
 703
 704                 if (try_to_freeze())
 705                         goto restart;
 706
 707                 if (down_interruptible(&fepriv->sem))
 708                         break;
 709
 710                 if (fepriv->reinitialise) {
 711                         dvb_frontend_init(fe);
 712                         if (fe->ops.set_tone && fepriv->tone != -1)
 713                                 fe->ops.set_tone(fe, fepriv->tone);
 714                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 715                                 fe->ops.set_voltage(fe, fepriv->voltage);
 716                         fepriv->reinitialise = 0;
 717                 }
 718
 719                 /* do an iteration of the tuning loop */
 720                 if (fe->ops.get_frontend_algo) {
 721                         algo = fe->ops.get_frontend_algo(fe);
 722                         switch (algo) {
 723                         case DVBFE_ALGO_HW:
 724                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 725
 726                                 if (fepriv->state & FESTATE_RETUNE) {
 727                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 728                                         re_tune = true;
 729                                         fepriv->state = FESTATE_TUNED;
 730                                 } else {
 731                                         re_tune = false;
 732                                 }
 733
 734                                 if (fe->ops.tune)
 735                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 736
 737                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 738                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 739                                         dvb_frontend_add_event(fe, s);
 740                                         fepriv->status = s;
 741                                 }
 742                                 break;
 743                         case DVBFE_ALGO_SW:
 744                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 745                                 dvb_frontend_swzigzag(fe);
 746                                 break;
 747                         case DVBFE_ALGO_CUSTOM:
 748                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 749                                 if (fepriv->state & FESTATE_RETUNE) {
 750                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 751                                         fepriv->state = FESTATE_TUNED;
 752                                 }
 753                                 /* Case where we are going to search for a carrier
 754                                  * User asked us to retune again for some reason, possibly
 755                                  * requesting a search with a new set of parameters
 756                                  */
 757                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 758                                         if (fe->ops.search) {
 759                                                 fepriv->algo_status = fe->ops.search(fe);
 760                                                 /* We did do a search as was requested, the flags are
 761                                                  * now unset as well and has the flags wrt to search.
 762                                                  */
 763                                         } else {
 764                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 765                                         }
 766                                 }
 767                                 /* Track the carrier if the search was successful */
 768                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 769                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 770                                         fepriv->delay = HZ / 2;
 771                                 }
 772                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 773                                 fe->ops.read_status(fe, &s);
 774                                 if (s != fepriv->status) {
 775                                         dvb_frontend_add_event(fe, s); /* update event list */
 776                                         fepriv->status = s;
 777                                         if (!(s & FE_HAS_LOCK)) {
 778                                                 fepriv->delay = HZ / 10;
 779                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 780                                         } else {
 781                                                 fepriv->delay = 60 * HZ;
 782                                         }
 783                                 }
 784                                 break;
 785                         default:
 786                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 787                                 break;
 788                         }
 789                 } else {
 790                         dvb_frontend_swzigzag(fe);
 791                 }
 792         }
 793
 794         if (dvb_powerdown_on_sleep) {
 795                 if (fe->ops.set_voltage)
 796                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 797                 if (fe->ops.tuner_ops.sleep) {
 798                         if (fe->ops.i2c_gate_ctrl)
 799                                 fe->ops.i2c_gate_ctrl(fe, 1);
 800                         fe->ops.tuner_ops.sleep(fe);
 801                         if (fe->ops.i2c_gate_ctrl)
 802                                 fe->ops.i2c_gate_ctrl(fe, 0);
 803                 }
 804                 if (fe->ops.sleep)
 805                         fe->ops.sleep(fe);
 806         }
 807
 808         fepriv->thread = NULL;
 809         if (kthread_should_stop())
 810                 fe->exit = DVB_FE_DEVICE_REMOVED;
 811         else
 812                 fe->exit = DVB_FE_NO_EXIT;
 813         mb();
 814
 815         if (semheld)
 816                 up(&fepriv->sem);
 817         dvb_frontend_wakeup(fe);
 818         return 0;
 819 }
 820
 821 static void dvb_frontend_stop(struct dvb_frontend *fe)
 822 {
 823         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 824
 825         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 826
 827         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 828                 fe->exit = DVB_FE_NORMAL_EXIT;
 829         mb();
 830
 831         if (!fepriv->thread)
 832                 return;
 833
 834         kthread_stop(fepriv->thread);
 835
 836         sema_init(&fepriv->sem, 1);
 837         fepriv->state = FESTATE_IDLE;
 838
 839         /* paranoia check in case a signal arrived */
 840         if (fepriv->thread)
 841                 dev_warn(fe->dvb->device,
 842                          "dvb_frontend_stop: warning: thread %p won't exit\n",
 843                          fepriv->thread);
 844 }
 845
 846 /*
 847  * Sleep for the amount of time given by add_usec parameter
 848  *
 849  * This needs to be as precise as possible, as it affects the detection of
 850  * the dish tone command at the satellite subsystem. The precision is improved
 851  * by using a scheduled msleep followed by udelay for the remainder.
 852  */
 853 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 854 {
 855         s32 delta;
 856
 857         *waketime = ktime_add_us(*waketime, add_usec);
 858         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 859         if (delta > 2500) {
 860                 msleep((delta - 1500) / 1000);
 861                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 862         }
 863         if (delta > 0)
 864                 udelay(delta);
 865 }
 866 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 867
 868 static int dvb_frontend_start(struct dvb_frontend *fe)
 869 {
 870         int ret;
 871         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 872         struct task_struct *fe_thread;
 873
 874         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 875
 876         if (fepriv->thread) {
 877                 if (fe->exit == DVB_FE_NO_EXIT)
 878                         return 0;
 879                 else
 880                         dvb_frontend_stop(fe);
 881         }
 882
 883         if (signal_pending(current))
 884                 return -EINTR;
 885         if (down_interruptible(&fepriv->sem))
 886                 return -EINTR;
 887
 888         fepriv->state = FESTATE_IDLE;
 889         fe->exit = DVB_FE_NO_EXIT;
 890         fepriv->thread = NULL;
 891         mb();
 892
 893         fe_thread = kthread_run(dvb_frontend_thread, fe,
 894                                 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
 895         if (IS_ERR(fe_thread)) {
 896                 ret = PTR_ERR(fe_thread);
 897                 dev_warn(fe->dvb->device,
 898                          "dvb_frontend_start: failed to start kthread (%d)\n",
 899                          ret);
 900                 up(&fepriv->sem);
 901                 return ret;
 902         }
 903         fepriv->thread = fe_thread;
 904         return 0;
 905 }
 906
 907 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 908                                               u32 *freq_min, u32 *freq_max,
 909                                               u32 *tolerance)
 910 {
 911         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 912         u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
 913         u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
 914         u32 frontend_min = fe->ops.info.frequency_min_hz;
 915         u32 frontend_max = fe->ops.info.frequency_max_hz;
 916
 917         *freq_min = max(frontend_min, tuner_min);
 918
 919         if (frontend_max == 0)
 920                 *freq_max = tuner_max;
 921         else if (tuner_max == 0)
 922                 *freq_max = frontend_max;
 923         else
 924                 *freq_max = min(frontend_max, tuner_max);
 925
 926         if (*freq_min == 0 || *freq_max == 0)
 927                 dev_warn(fe->dvb->device,
 928                          "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 929                          fe->dvb->num, fe->id);
 930
 931         /* If the standard is for satellite, convert frequencies to kHz */
 932         switch (c->delivery_system) {
 933         case SYS_DVBS:
 934         case SYS_DVBS2:
 935         case SYS_TURBO:
 936         case SYS_ISDBS:
 937                 *freq_min /= kHz;
 938                 *freq_max /= kHz;
 939                 if (tolerance)
 940                         *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
 941
 942                 break;
 943         default:
 944                 if (tolerance)
 945                         *tolerance = fe->ops.info.frequency_tolerance_hz;
 946                 break;
 947         }
 948 }
 949
 950 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
 951 {
 952         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 953         u32 fe_step = fe->ops.info.frequency_stepsize_hz;
 954         u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
 955         u32 step = max(fe_step, tuner_step);
 956
 957         switch (c->delivery_system) {
 958         case SYS_DVBS:
 959         case SYS_DVBS2:
 960         case SYS_TURBO:
 961         case SYS_ISDBS:
 962                 step /= kHz;
 963                 break;
 964         default:
 965                 break;
 966         }
 967
 968         return step;
 969 }
 970
 971 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 972 {
 973         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 974         u32 freq_min;
 975         u32 freq_max;
 976
 977         /* range check: frequency */
 978         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
 979         if ((freq_min && c->frequency < freq_min) ||
 980             (freq_max && c->frequency > freq_max)) {
 981                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 982                          fe->dvb->num, fe->id, c->frequency,
 983                          freq_min, freq_max);
 984                 return -EINVAL;
 985         }
 986
 987         /* range check: symbol rate */
 988         switch (c->delivery_system) {
 989         case SYS_DVBS:
 990         case SYS_DVBS2:
 991         case SYS_TURBO:
 992         case SYS_DVBC_ANNEX_A:
 993         case SYS_DVBC_ANNEX_C:
 994                 if ((fe->ops.info.symbol_rate_min &&
 995                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 996                     (fe->ops.info.symbol_rate_max &&
 997                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 998                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 999                                  fe->dvb->num, fe->id, c->symbol_rate,
1000                                  fe->ops.info.symbol_rate_min,
1001                                  fe->ops.info.symbol_rate_max);
1002                         return -EINVAL;
1003                 }
1004         default:
1005                 break;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1012 {
1013         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1014         int i;
1015         u32 delsys;
1016
1017         delsys = c->delivery_system;
1018         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1019         c->delivery_system = delsys;
1020
1021         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1022                 __func__, c->delivery_system);
1023
1024         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1025         c->bandwidth_hz = 0;    /* AUTO */
1026         c->guard_interval = GUARD_INTERVAL_AUTO;
1027         c->hierarchy = HIERARCHY_AUTO;
1028         c->symbol_rate = 0;
1029         c->code_rate_HP = FEC_AUTO;
1030         c->code_rate_LP = FEC_AUTO;
1031         c->fec_inner = FEC_AUTO;
1032         c->rolloff = ROLLOFF_AUTO;
1033         c->voltage = SEC_VOLTAGE_OFF;
1034         c->sectone = SEC_TONE_OFF;
1035         c->pilot = PILOT_AUTO;
1036
1037         c->isdbt_partial_reception = 0;
1038         c->isdbt_sb_mode = 0;
1039         c->isdbt_sb_subchannel = 0;
1040         c->isdbt_sb_segment_idx = 0;
1041         c->isdbt_sb_segment_count = 0;
1042         c->isdbt_layer_enabled = 7;     /* All layers (A,B,C) */
1043         for (i = 0; i < 3; i++) {
1044                 c->layer[i].fec = FEC_AUTO;
1045                 c->layer[i].modulation = QAM_AUTO;
1046                 c->layer[i].interleaving = 0;
1047                 c->layer[i].segment_count = 0;
1048         }
1049
1050         c->stream_id = NO_STREAM_ID_FILTER;
1051         c->scrambling_sequence_index = 0;/* default sequence */
1052
1053         switch (c->delivery_system) {
1054         case SYS_DVBS:
1055         case SYS_DVBS2:
1056         case SYS_TURBO:
1057                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1058                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1059                 break;
1060         case SYS_ATSC:
1061                 c->modulation = VSB_8;
1062                 break;
1063         case SYS_ISDBS:
1064                 c->symbol_rate = 28860000;
1065                 c->rolloff = ROLLOFF_35;
1066                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1067                 break;
1068         default:
1069                 c->modulation = QAM_AUTO;
1070                 break;
1071         }
1072
1073         c->lna = LNA_AUTO;
1074
1075         return 0;
1076 }
1077
1078 #define _DTV_CMD(n, s, b) \
1079 [n] = { \
1080         .name = #n, \
1081         .cmd  = n, \
1082         .set  = s,\
1083         .buffer = b \
1084 }
1085
1086 struct dtv_cmds_h {
1087         char    *name;          /* A display name for debugging purposes */
1088
1089         __u32   cmd;            /* A unique ID */
1090
1091         /* Flags */
1092         __u32   set:1;          /* Either a set or get property */
1093         __u32   buffer:1;       /* Does this property use the buffer? */
1094         __u32   reserved:30;    /* Align */
1095 };
1096
1097 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1098         _DTV_CMD(DTV_TUNE, 1, 0),
1099         _DTV_CMD(DTV_CLEAR, 1, 0),
1100
1101         /* Set */
1102         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1103         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1104         _DTV_CMD(DTV_MODULATION, 1, 0),
1105         _DTV_CMD(DTV_INVERSION, 1, 0),
1106         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1107         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1108         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1109         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1110         _DTV_CMD(DTV_TONE, 1, 0),
1111         _DTV_CMD(DTV_PILOT, 1, 0),
1112         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1113         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1114         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1115         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1116         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1117         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1118         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1119         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1120
1121         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1122         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1123         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1124         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1125         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1126         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1127         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1128         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1129         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1130         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1131         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1132         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1133         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1134         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1135         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1136         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1137         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1138         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1139
1140         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1141         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1142         _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1143         _DTV_CMD(DTV_LNA, 1, 0),
1144
1145         /* Get */
1146         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1147         _DTV_CMD(DTV_API_VERSION, 0, 0),
1148
1149         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1150
1151         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1152         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1153
1154         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1155         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1156         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1157         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1158         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1159         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1160         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1161         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1162         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1163         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1164         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1165         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1166         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1167
1168         /* Statistics API */
1169         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1170         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1171         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1172         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1173         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1174         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1175         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1176         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1177 };
1178
1179 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1180  * drivers can use a single set_frontend tuning function, regardless of whether
1181  * it's being used for the legacy or new API, reducing code and complexity.
1182  */
1183 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1184                                    struct dtv_frontend_properties *c,
1185                                    const struct dvb_frontend_parameters *p)
1186 {
1187         c->frequency = p->frequency;
1188         c->inversion = p->inversion;
1189
1190         switch (dvbv3_type(c->delivery_system)) {
1191         case DVBV3_QPSK:
1192                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1193                 c->symbol_rate = p->u.qpsk.symbol_rate;
1194                 c->fec_inner = p->u.qpsk.fec_inner;
1195                 break;
1196         case DVBV3_QAM:
1197                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1198                 c->symbol_rate = p->u.qam.symbol_rate;
1199                 c->fec_inner = p->u.qam.fec_inner;
1200                 c->modulation = p->u.qam.modulation;
1201                 break;
1202         case DVBV3_OFDM:
1203                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1204
1205                 switch (p->u.ofdm.bandwidth) {
1206                 case BANDWIDTH_10_MHZ:
1207                         c->bandwidth_hz = 10000000;
1208                         break;
1209                 case BANDWIDTH_8_MHZ:
1210                         c->bandwidth_hz = 8000000;
1211                         break;
1212                 case BANDWIDTH_7_MHZ:
1213                         c->bandwidth_hz = 7000000;
1214                         break;
1215                 case BANDWIDTH_6_MHZ:
1216                         c->bandwidth_hz = 6000000;
1217                         break;
1218                 case BANDWIDTH_5_MHZ:
1219                         c->bandwidth_hz = 5000000;
1220                         break;
1221                 case BANDWIDTH_1_712_MHZ:
1222                         c->bandwidth_hz = 1712000;
1223                         break;
1224                 case BANDWIDTH_AUTO:
1225                         c->bandwidth_hz = 0;
1226                 }
1227
1228                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1229                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1230                 c->modulation = p->u.ofdm.constellation;
1231                 c->transmission_mode = p->u.ofdm.transmission_mode;
1232                 c->guard_interval = p->u.ofdm.guard_interval;
1233                 c->hierarchy = p->u.ofdm.hierarchy_information;
1234                 break;
1235         case DVBV3_ATSC:
1236                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1237                 c->modulation = p->u.vsb.modulation;
1238                 if (c->delivery_system == SYS_ATSCMH)
1239                         break;
1240                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1241                         c->delivery_system = SYS_ATSC;
1242                 else
1243                         c->delivery_system = SYS_DVBC_ANNEX_B;
1244                 break;
1245         case DVBV3_UNKNOWN:
1246                 dev_err(fe->dvb->device,
1247                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1248                         __func__, c->delivery_system);
1249                 return -EINVAL;
1250         }
1251
1252         return 0;
1253 }
1254
1255 /* Ensure the cached values are set correctly in the frontend
1256  * legacy tuning structures, for the advanced tuning API.
1257  */
1258 static int
1259 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1260                                 const struct dtv_frontend_properties *c,
1261                                 struct dvb_frontend_parameters *p)
1262 {
1263         p->frequency = c->frequency;
1264         p->inversion = c->inversion;
1265
1266         switch (dvbv3_type(c->delivery_system)) {
1267         case DVBV3_UNKNOWN:
1268                 dev_err(fe->dvb->device,
1269                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1270                         __func__, c->delivery_system);
1271                 return -EINVAL;
1272         case DVBV3_QPSK:
1273                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1274                 p->u.qpsk.symbol_rate = c->symbol_rate;
1275                 p->u.qpsk.fec_inner = c->fec_inner;
1276                 break;
1277         case DVBV3_QAM:
1278                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1279                 p->u.qam.symbol_rate = c->symbol_rate;
1280                 p->u.qam.fec_inner = c->fec_inner;
1281                 p->u.qam.modulation = c->modulation;
1282                 break;
1283         case DVBV3_OFDM:
1284                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1285                 switch (c->bandwidth_hz) {
1286                 case 10000000:
1287                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1288                         break;
1289                 case 8000000:
1290                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1291                         break;
1292                 case 7000000:
1293                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1294                         break;
1295                 case 6000000:
1296                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1297                         break;
1298                 case 5000000:
1299                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1300                         break;
1301                 case 1712000:
1302                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1303                         break;
1304                 case 0:
1305                 default:
1306                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1307                 }
1308                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1309                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1310                 p->u.ofdm.constellation = c->modulation;
1311                 p->u.ofdm.transmission_mode = c->transmission_mode;
1312                 p->u.ofdm.guard_interval = c->guard_interval;
1313                 p->u.ofdm.hierarchy_information = c->hierarchy;
1314                 break;
1315         case DVBV3_ATSC:
1316                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1317                 p->u.vsb.modulation = c->modulation;
1318                 break;
1319         }
1320         return 0;
1321 }
1322
1323 /**
1324  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1325  * @fe:         struct dvb_frontend pointer
1326  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1327  * @p_out:      struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1328  *
1329  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1330  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1331  * If p_out is not null, it will update the DVBv3 params pointed by it.
1332  */
1333 static int dtv_get_frontend(struct dvb_frontend *fe,
1334                             struct dtv_frontend_properties *c,
1335                             struct dvb_frontend_parameters *p_out)
1336 {
1337         int r;
1338
1339         if (fe->ops.get_frontend) {
1340                 r = fe->ops.get_frontend(fe, c);
1341                 if (unlikely(r < 0))
1342                         return r;
1343                 if (p_out)
1344                         dtv_property_legacy_params_sync(fe, c, p_out);
1345                 return 0;
1346         }
1347
1348         /* As everything is in cache, get_frontend fops are always supported */
1349         return 0;
1350 }
1351
1352 static int dvb_frontend_handle_ioctl(struct file *file,
1353                                      unsigned int cmd, void *parg);
1354
1355 static int dtv_property_process_get(struct dvb_frontend *fe,
1356                                     const struct dtv_frontend_properties *c,
1357                                     struct dtv_property *tvp,
1358                                     struct file *file)
1359 {
1360         int ncaps;
1361
1362         switch (tvp->cmd) {
1363         case DTV_ENUM_DELSYS:
1364                 ncaps = 0;
1365                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1366                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1367                         ncaps++;
1368                 }
1369                 tvp->u.buffer.len = ncaps;
1370                 break;
1371         case DTV_FREQUENCY:
1372                 tvp->u.data = c->frequency;
1373                 break;
1374         case DTV_MODULATION:
1375                 tvp->u.data = c->modulation;
1376                 break;
1377         case DTV_BANDWIDTH_HZ:
1378                 tvp->u.data = c->bandwidth_hz;
1379                 break;
1380         case DTV_INVERSION:
1381                 tvp->u.data = c->inversion;
1382                 break;
1383         case DTV_SYMBOL_RATE:
1384                 tvp->u.data = c->symbol_rate;
1385                 break;
1386         case DTV_INNER_FEC:
1387                 tvp->u.data = c->fec_inner;
1388                 break;
1389         case DTV_PILOT:
1390                 tvp->u.data = c->pilot;
1391                 break;
1392         case DTV_ROLLOFF:
1393                 tvp->u.data = c->rolloff;
1394                 break;
1395         case DTV_DELIVERY_SYSTEM:
1396                 tvp->u.data = c->delivery_system;
1397                 break;
1398         case DTV_VOLTAGE:
1399                 tvp->u.data = c->voltage;
1400                 break;
1401         case DTV_TONE:
1402                 tvp->u.data = c->sectone;
1403                 break;
1404         case DTV_API_VERSION:
1405                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1406                 break;
1407         case DTV_CODE_RATE_HP:
1408                 tvp->u.data = c->code_rate_HP;
1409                 break;
1410         case DTV_CODE_RATE_LP:
1411                 tvp->u.data = c->code_rate_LP;
1412                 break;
1413         case DTV_GUARD_INTERVAL:
1414                 tvp->u.data = c->guard_interval;
1415                 break;
1416         case DTV_TRANSMISSION_MODE:
1417                 tvp->u.data = c->transmission_mode;
1418                 break;
1419         case DTV_HIERARCHY:
1420                 tvp->u.data = c->hierarchy;
1421                 break;
1422         case DTV_INTERLEAVING:
1423                 tvp->u.data = c->interleaving;
1424                 break;
1425
1426         /* ISDB-T Support here */
1427         case DTV_ISDBT_PARTIAL_RECEPTION:
1428                 tvp->u.data = c->isdbt_partial_reception;
1429                 break;
1430         case DTV_ISDBT_SOUND_BROADCASTING:
1431                 tvp->u.data = c->isdbt_sb_mode;
1432                 break;
1433         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1434                 tvp->u.data = c->isdbt_sb_subchannel;
1435                 break;
1436         case DTV_ISDBT_SB_SEGMENT_IDX:
1437                 tvp->u.data = c->isdbt_sb_segment_idx;
1438                 break;
1439         case DTV_ISDBT_SB_SEGMENT_COUNT:
1440                 tvp->u.data = c->isdbt_sb_segment_count;
1441                 break;
1442         case DTV_ISDBT_LAYER_ENABLED:
1443                 tvp->u.data = c->isdbt_layer_enabled;
1444                 break;
1445         case DTV_ISDBT_LAYERA_FEC:
1446                 tvp->u.data = c->layer[0].fec;
1447                 break;
1448         case DTV_ISDBT_LAYERA_MODULATION:
1449                 tvp->u.data = c->layer[0].modulation;
1450                 break;
1451         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1452                 tvp->u.data = c->layer[0].segment_count;
1453                 break;
1454         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1455                 tvp->u.data = c->layer[0].interleaving;
1456                 break;
1457         case DTV_ISDBT_LAYERB_FEC:
1458                 tvp->u.data = c->layer[1].fec;
1459                 break;
1460         case DTV_ISDBT_LAYERB_MODULATION:
1461                 tvp->u.data = c->layer[1].modulation;
1462                 break;
1463         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1464                 tvp->u.data = c->layer[1].segment_count;
1465                 break;
1466         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1467                 tvp->u.data = c->layer[1].interleaving;
1468                 break;
1469         case DTV_ISDBT_LAYERC_FEC:
1470                 tvp->u.data = c->layer[2].fec;
1471                 break;
1472         case DTV_ISDBT_LAYERC_MODULATION:
1473                 tvp->u.data = c->layer[2].modulation;
1474                 break;
1475         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1476                 tvp->u.data = c->layer[2].segment_count;
1477                 break;
1478         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1479                 tvp->u.data = c->layer[2].interleaving;
1480                 break;
1481
1482         /* Multistream support */
1483         case DTV_STREAM_ID:
1484         case DTV_DVBT2_PLP_ID_LEGACY:
1485                 tvp->u.data = c->stream_id;
1486                 break;
1487
1488         /* Physical layer scrambling support */
1489         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1490                 tvp->u.data = c->scrambling_sequence_index;
1491                 break;
1492
1493         /* ATSC-MH */
1494         case DTV_ATSCMH_FIC_VER:
1495                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1496                 break;
1497         case DTV_ATSCMH_PARADE_ID:
1498                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1499                 break;
1500         case DTV_ATSCMH_NOG:
1501                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1502                 break;
1503         case DTV_ATSCMH_TNOG:
1504                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1505                 break;
1506         case DTV_ATSCMH_SGN:
1507                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1508                 break;
1509         case DTV_ATSCMH_PRC:
1510                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1511                 break;
1512         case DTV_ATSCMH_RS_FRAME_MODE:
1513                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1514                 break;
1515         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1516                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1517                 break;
1518         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1519                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1520                 break;
1521         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1522                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1523                 break;
1524         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1525                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1526                 break;
1527         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1528                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1529                 break;
1530         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1531                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1532                 break;
1533         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1534                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1535                 break;
1536         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1537                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1538                 break;
1539
1540         case DTV_LNA:
1541                 tvp->u.data = c->lna;
1542                 break;
1543
1544         /* Fill quality measures */
1545         case DTV_STAT_SIGNAL_STRENGTH:
1546                 tvp->u.st = c->strength;
1547                 break;
1548         case DTV_STAT_CNR:
1549                 tvp->u.st = c->cnr;
1550                 break;
1551         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1552                 tvp->u.st = c->pre_bit_error;
1553                 break;
1554         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1555                 tvp->u.st = c->pre_bit_count;
1556                 break;
1557         case DTV_STAT_POST_ERROR_BIT_COUNT:
1558                 tvp->u.st = c->post_bit_error;
1559                 break;
1560         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1561                 tvp->u.st = c->post_bit_count;
1562                 break;
1563         case DTV_STAT_ERROR_BLOCK_COUNT:
1564                 tvp->u.st = c->block_error;
1565                 break;
1566         case DTV_STAT_TOTAL_BLOCK_COUNT:
1567                 tvp->u.st = c->block_count;
1568                 break;
1569         default:
1570                 dev_dbg(fe->dvb->device,
1571                         "%s: FE property %d doesn't exist\n",
1572                         __func__, tvp->cmd);
1573                 return -EINVAL;
1574         }
1575
1576         if (!dtv_cmds[tvp->cmd].buffer)
1577                 dev_dbg(fe->dvb->device,
1578                         "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1579                         __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1580                         tvp->u.data);
1581         else
1582                 dev_dbg(fe->dvb->device,
1583                         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1584                         __func__,
1585                         tvp->cmd, dtv_cmds[tvp->cmd].name,
1586                         tvp->u.buffer.len,
1587                         tvp->u.buffer.len, tvp->u.buffer.data);
1588
1589         return 0;
1590 }
1591
1592 static int dtv_set_frontend(struct dvb_frontend *fe);
1593
1594 static bool is_dvbv3_delsys(u32 delsys)
1595 {
1596         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1597                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1598 }
1599
1600 /**
1601  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1602  * @fe:                 struct frontend;
1603  * @delsys:                     DVBv5 type that will be used for emulation
1604  *
1605  * Provides emulation for delivery systems that are compatible with the old
1606  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1607  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1608  * parameters are compatible with DVB-S spec.
1609  */
1610 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1611 {
1612         int i;
1613         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1614
1615         c->delivery_system = delsys;
1616
1617         /*
1618          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1619          */
1620         if (c->delivery_system == SYS_ISDBT) {
1621                 dev_dbg(fe->dvb->device,
1622                         "%s: Using defaults for SYS_ISDBT\n",
1623                         __func__);
1624
1625                 if (!c->bandwidth_hz)
1626                         c->bandwidth_hz = 6000000;
1627
1628                 c->isdbt_partial_reception = 0;
1629                 c->isdbt_sb_mode = 0;
1630                 c->isdbt_sb_subchannel = 0;
1631                 c->isdbt_sb_segment_idx = 0;
1632                 c->isdbt_sb_segment_count = 0;
1633                 c->isdbt_layer_enabled = 7;
1634                 for (i = 0; i < 3; i++) {
1635                         c->layer[i].fec = FEC_AUTO;
1636                         c->layer[i].modulation = QAM_AUTO;
1637                         c->layer[i].interleaving = 0;
1638                         c->layer[i].segment_count = 0;
1639                 }
1640         }
1641         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1642                 __func__, c->delivery_system);
1643
1644         return 0;
1645 }
1646
1647 /**
1648  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1649  * @fe:                 frontend struct
1650  * @desired_system:     delivery system requested by the user
1651  *
1652  * A DVBv5 call know what's the desired system it wants. So, set it.
1653  *
1654  * There are, however, a few known issues with early DVBv5 applications that
1655  * are also handled by this logic:
1656  *
1657  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1658  *    This is an API violation, but, as we don't want to break userspace,
1659  *    convert it to the first supported delivery system.
1660  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1661  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1662  *    ISDB-T provided backward compat with DVB-T.
1663  */
1664 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1665                                      u32 desired_system)
1666 {
1667         int ncaps;
1668         u32 delsys = SYS_UNDEFINED;
1669         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1670         enum dvbv3_emulation_type type;
1671
1672         /*
1673          * It was reported that some old DVBv5 applications were
1674          * filling delivery_system with SYS_UNDEFINED. If this happens,
1675          * assume that the application wants to use the first supported
1676          * delivery system.
1677          */
1678         if (desired_system == SYS_UNDEFINED)
1679                 desired_system = fe->ops.delsys[0];
1680
1681         /*
1682          * This is a DVBv5 call. So, it likely knows the supported
1683          * delivery systems. So, check if the desired delivery system is
1684          * supported
1685          */
1686         ncaps = 0;
1687         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1688                 if (fe->ops.delsys[ncaps] == desired_system) {
1689                         c->delivery_system = desired_system;
1690                         dev_dbg(fe->dvb->device,
1691                                 "%s: Changing delivery system to %d\n",
1692                                 __func__, desired_system);
1693                         return 0;
1694                 }
1695                 ncaps++;
1696         }
1697
1698         /*
1699          * The requested delivery system isn't supported. Maybe userspace
1700          * is requesting a DVBv3 compatible delivery system.
1701          *
1702          * The emulation only works if the desired system is one of the
1703          * delivery systems supported by DVBv3 API
1704          */
1705         if (!is_dvbv3_delsys(desired_system)) {
1706                 dev_dbg(fe->dvb->device,
1707                         "%s: Delivery system %d not supported.\n",
1708                         __func__, desired_system);
1709                 return -EINVAL;
1710         }
1711
1712         type = dvbv3_type(desired_system);
1713
1714         /*
1715         * Get the last non-DVBv3 delivery system that has the same type
1716         * of the desired system
1717         */
1718         ncaps = 0;
1719         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1720                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1721                         delsys = fe->ops.delsys[ncaps];
1722                 ncaps++;
1723         }
1724
1725         /* There's nothing compatible with the desired delivery system */
1726         if (delsys == SYS_UNDEFINED) {
1727                 dev_dbg(fe->dvb->device,
1728                         "%s: Delivery system %d not supported on emulation mode.\n",
1729                         __func__, desired_system);
1730                 return -EINVAL;
1731         }
1732
1733         dev_dbg(fe->dvb->device,
1734                 "%s: Using delivery system %d emulated as if it were %d\n",
1735                 __func__, delsys, desired_system);
1736
1737         return emulate_delivery_system(fe, desired_system);
1738 }
1739
1740 /**
1741  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1742  * @fe: frontend struct
1743  *
1744  * A DVBv3 call doesn't know what's the desired system it wants. It also
1745  * doesn't allow to switch between different types. Due to that, userspace
1746  * should use DVBv5 instead.
1747  * However, in order to avoid breaking userspace API, limited backward
1748  * compatibility support is provided.
1749  *
1750  * There are some delivery systems that are incompatible with DVBv3 calls.
1751  *
1752  * This routine should work fine for frontends that support just one delivery
1753  * system.
1754  *
1755  * For frontends that support multiple frontends:
1756  * 1) It defaults to use the first supported delivery system. There's an
1757  *    userspace application that allows changing it at runtime;
1758  *
1759  * 2) If the current delivery system is not compatible with DVBv3, it gets
1760  *    the first one that it is compatible.
1761  *
1762  * NOTE: in order for this to work with applications like Kaffeine that
1763  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1764  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1765  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1766  *      to DVB-S.
1767  */
1768 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1769 {
1770         int ncaps;
1771         u32 delsys = SYS_UNDEFINED;
1772         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1773
1774         /* If not set yet, defaults to the first supported delivery system */
1775         if (c->delivery_system == SYS_UNDEFINED)
1776                 c->delivery_system = fe->ops.delsys[0];
1777
1778         /*
1779          * Trivial case: just use the current one, if it already a DVBv3
1780          * delivery system
1781          */
1782         if (is_dvbv3_delsys(c->delivery_system)) {
1783                 dev_dbg(fe->dvb->device,
1784                         "%s: Using delivery system to %d\n",
1785                         __func__, c->delivery_system);
1786                 return 0;
1787         }
1788
1789         /*
1790          * Seek for the first delivery system that it is compatible with a
1791          * DVBv3 standard
1792          */
1793         ncaps = 0;
1794         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1795                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1796                         delsys = fe->ops.delsys[ncaps];
1797                         break;
1798                 }
1799                 ncaps++;
1800         }
1801         if (delsys == SYS_UNDEFINED) {
1802                 dev_dbg(fe->dvb->device,
1803                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1804                         __func__);
1805                 return -EINVAL;
1806         }
1807         return emulate_delivery_system(fe, delsys);
1808 }
1809
1810 /**
1811  * dtv_property_process_set -  Sets a single DTV property
1812  * @fe:         Pointer to &struct dvb_frontend
1813  * @file:       Pointer to &struct file
1814  * @cmd:        Digital TV command
1815  * @data:       An unsigned 32-bits number
1816  *
1817  * This routine assigns the property
1818  * value to the corresponding member of
1819  * &struct dtv_frontend_properties
1820  *
1821  * Returns:
1822  * Zero on success, negative errno on failure.
1823  */
1824 static int dtv_property_process_set(struct dvb_frontend *fe,
1825                                     struct file *file,
1826                                     u32 cmd, u32 data)
1827 {
1828         int r = 0;
1829         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1830
1831         /** Dump DTV command name and value*/
1832         if (!cmd || cmd > DTV_MAX_COMMAND)
1833                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1834                          __func__, cmd);
1835         else
1836                 dev_dbg(fe->dvb->device,
1837                         "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1838                         __func__, cmd, dtv_cmds[cmd].name, data);
1839         switch (cmd) {
1840         case DTV_CLEAR:
1841                 /*
1842                  * Reset a cache of data specific to the frontend here. This does
1843                  * not effect hardware.
1844                  */
1845                 dvb_frontend_clear_cache(fe);
1846                 break;
1847         case DTV_TUNE:
1848                 /*
1849                  * Use the cached Digital TV properties to tune the
1850                  * frontend
1851                  */
1852                 dev_dbg(fe->dvb->device,
1853                         "%s: Setting the frontend from property cache\n",
1854                         __func__);
1855
1856                 r = dtv_set_frontend(fe);
1857                 break;
1858         case DTV_FREQUENCY:
1859                 c->frequency = data;
1860                 break;
1861         case DTV_MODULATION:
1862                 c->modulation = data;
1863                 break;
1864         case DTV_BANDWIDTH_HZ:
1865                 c->bandwidth_hz = data;
1866                 break;
1867         case DTV_INVERSION:
1868                 c->inversion = data;
1869                 break;
1870         case DTV_SYMBOL_RATE:
1871                 c->symbol_rate = data;
1872                 break;
1873         case DTV_INNER_FEC:
1874                 c->fec_inner = data;
1875                 break;
1876         case DTV_PILOT:
1877                 c->pilot = data;
1878                 break;
1879         case DTV_ROLLOFF:
1880                 c->rolloff = data;
1881                 break;
1882         case DTV_DELIVERY_SYSTEM:
1883                 r = dvbv5_set_delivery_system(fe, data);
1884                 break;
1885         case DTV_VOLTAGE:
1886                 c->voltage = data;
1887                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1888                                               (void *)c->voltage);
1889                 break;
1890         case DTV_TONE:
1891                 c->sectone = data;
1892                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1893                                               (void *)c->sectone);
1894                 break;
1895         case DTV_CODE_RATE_HP:
1896                 c->code_rate_HP = data;
1897                 break;
1898         case DTV_CODE_RATE_LP:
1899                 c->code_rate_LP = data;
1900                 break;
1901         case DTV_GUARD_INTERVAL:
1902                 c->guard_interval = data;
1903                 break;
1904         case DTV_TRANSMISSION_MODE:
1905                 c->transmission_mode = data;
1906                 break;
1907         case DTV_HIERARCHY:
1908                 c->hierarchy = data;
1909                 break;
1910         case DTV_INTERLEAVING:
1911                 c->interleaving = data;
1912                 break;
1913
1914         /* ISDB-T Support here */
1915         case DTV_ISDBT_PARTIAL_RECEPTION:
1916                 c->isdbt_partial_reception = data;
1917                 break;
1918         case DTV_ISDBT_SOUND_BROADCASTING:
1919                 c->isdbt_sb_mode = data;
1920                 break;
1921         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1922                 c->isdbt_sb_subchannel = data;
1923                 break;
1924         case DTV_ISDBT_SB_SEGMENT_IDX:
1925                 c->isdbt_sb_segment_idx = data;
1926                 break;
1927         case DTV_ISDBT_SB_SEGMENT_COUNT:
1928                 c->isdbt_sb_segment_count = data;
1929                 break;
1930         case DTV_ISDBT_LAYER_ENABLED:
1931                 c->isdbt_layer_enabled = data;
1932                 break;
1933         case DTV_ISDBT_LAYERA_FEC:
1934                 c->layer[0].fec = data;
1935                 break;
1936         case DTV_ISDBT_LAYERA_MODULATION:
1937                 c->layer[0].modulation = data;
1938                 break;
1939         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1940                 c->layer[0].segment_count = data;
1941                 break;
1942         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1943                 c->layer[0].interleaving = data;
1944                 break;
1945         case DTV_ISDBT_LAYERB_FEC:
1946                 c->layer[1].fec = data;
1947                 break;
1948         case DTV_ISDBT_LAYERB_MODULATION:
1949                 c->layer[1].modulation = data;
1950                 break;
1951         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1952                 c->layer[1].segment_count = data;
1953                 break;
1954         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1955                 c->layer[1].interleaving = data;
1956                 break;
1957         case DTV_ISDBT_LAYERC_FEC:
1958                 c->layer[2].fec = data;
1959                 break;
1960         case DTV_ISDBT_LAYERC_MODULATION:
1961                 c->layer[2].modulation = data;
1962                 break;
1963         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1964                 c->layer[2].segment_count = data;
1965                 break;
1966         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1967                 c->layer[2].interleaving = data;
1968                 break;
1969
1970         /* Multistream support */
1971         case DTV_STREAM_ID:
1972         case DTV_DVBT2_PLP_ID_LEGACY:
1973                 c->stream_id = data;
1974                 break;
1975
1976         /* Physical layer scrambling support */
1977         case DTV_SCRAMBLING_SEQUENCE_INDEX:
1978                 c->scrambling_sequence_index = data;
1979                 break;
1980
1981         /* ATSC-MH */
1982         case DTV_ATSCMH_PARADE_ID:
1983                 fe->dtv_property_cache.atscmh_parade_id = data;
1984                 break;
1985         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1986                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1987                 break;
1988
1989         case DTV_LNA:
1990                 c->lna = data;
1991                 if (fe->ops.set_lna)
1992                         r = fe->ops.set_lna(fe);
1993                 if (r < 0)
1994                         c->lna = LNA_AUTO;
1995                 break;
1996
1997         default:
1998                 return -EINVAL;
1999         }
2000
2001         return r;
2002 }
2003
2004 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2005                                  void *parg)
2006 {
2007         struct dvb_device *dvbdev = file->private_data;
2008         struct dvb_frontend *fe = dvbdev->priv;
2009         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2010         int err;
2011
2012         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2013         if (down_interruptible(&fepriv->sem))
2014                 return -ERESTARTSYS;
2015
2016         if (fe->exit != DVB_FE_NO_EXIT) {
2017                 up(&fepriv->sem);
2018                 return -ENODEV;
2019         }
2020
2021         /*
2022          * If the frontend is opened in read-only mode, only the ioctls
2023          * that don't interfere with the tune logic should be accepted.
2024          * That allows an external application to monitor the DVB QoS and
2025          * statistics parameters.
2026          *
2027          * That matches all _IOR() ioctls, except for two special cases:
2028          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2029          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2030          *     setup
2031          * So, those two ioctls should also return -EPERM, as otherwise
2032          * reading from them would interfere with a DVB tune application
2033          */
2034         if ((file->f_flags & O_ACCMODE) == O_RDONLY
2035             && (_IOC_DIR(cmd) != _IOC_READ
2036                 || cmd == FE_GET_EVENT
2037                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2038                 up(&fepriv->sem);
2039                 return -EPERM;
2040         }
2041
2042         err = dvb_frontend_handle_ioctl(file, cmd, parg);
2043
2044         up(&fepriv->sem);
2045         return err;
2046 }
2047
2048 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2049                                unsigned long arg)
2050 {
2051         struct dvb_device *dvbdev = file->private_data;
2052
2053         if (!dvbdev)
2054                 return -ENODEV;
2055
2056         return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2057 }
2058
2059 #ifdef CONFIG_COMPAT
2060 struct compat_dtv_property {
2061         __u32 cmd;
2062         __u32 reserved[3];
2063         union {
2064                 __u32 data;
2065                 struct dtv_fe_stats st;
2066                 struct {
2067                         __u8 data[32];
2068                         __u32 len;
2069                         __u32 reserved1[3];
2070                         compat_uptr_t reserved2;
2071                 } buffer;
2072         } u;
2073         int result;
2074 } __attribute__ ((packed));
2075
2076 struct compat_dtv_properties {
2077         __u32 num;
2078         compat_uptr_t props;
2079 };
2080
2081 #define COMPAT_FE_SET_PROPERTY     _IOW('o', 82, struct compat_dtv_properties)
2082 #define COMPAT_FE_GET_PROPERTY     _IOR('o', 83, struct compat_dtv_properties)
2083
2084 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2085                                             unsigned long arg)
2086 {
2087         struct dvb_device *dvbdev = file->private_data;
2088         struct dvb_frontend *fe = dvbdev->priv;
2089         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2090         int i, err = 0;
2091
2092         if (cmd == COMPAT_FE_SET_PROPERTY) {
2093                 struct compat_dtv_properties prop, *tvps = NULL;
2094                 struct compat_dtv_property *tvp = NULL;
2095
2096                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2097                         return -EFAULT;
2098
2099                 tvps = &prop;
2100
2101                 /*
2102                  * Put an arbitrary limit on the number of messages that can
2103                  * be sent at once
2104                  */
2105                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2106                         return -EINVAL;
2107
2108                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2109                 if (IS_ERR(tvp))
2110                         return PTR_ERR(tvp);
2111
2112                 for (i = 0; i < tvps->num; i++) {
2113                         err = dtv_property_process_set(fe, file,
2114                                                        (tvp + i)->cmd,
2115                                                        (tvp + i)->u.data);
2116                         if (err < 0) {
2117                                 kfree(tvp);
2118                                 return err;
2119                         }
2120                 }
2121                 kfree(tvp);
2122         } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2123                 struct compat_dtv_properties prop, *tvps = NULL;
2124                 struct compat_dtv_property *tvp = NULL;
2125                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2126
2127                 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2128                         return -EFAULT;
2129
2130                 tvps = &prop;
2131
2132                 /*
2133                  * Put an arbitrary limit on the number of messages that can
2134                  * be sent at once
2135                  */
2136                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2137                         return -EINVAL;
2138
2139                 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2140                 if (IS_ERR(tvp))
2141                         return PTR_ERR(tvp);
2142
2143                 /*
2144                  * Let's use our own copy of property cache, in order to
2145                  * avoid mangling with DTV zigzag logic, as drivers might
2146                  * return crap, if they don't check if the data is available
2147                  * before updating the properties cache.
2148                  */
2149                 if (fepriv->state != FESTATE_IDLE) {
2150                         err = dtv_get_frontend(fe, &getp, NULL);
2151                         if (err < 0) {
2152                                 kfree(tvp);
2153                                 return err;
2154                         }
2155                 }
2156                 for (i = 0; i < tvps->num; i++) {
2157                         err = dtv_property_process_get(
2158                             fe, &getp, (struct dtv_property *)(tvp + i), file);
2159                         if (err < 0) {
2160                                 kfree(tvp);
2161                                 return err;
2162                         }
2163                 }
2164
2165                 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2166                                  tvps->num * sizeof(struct compat_dtv_property))) {
2167                         kfree(tvp);
2168                         return -EFAULT;
2169                 }
2170                 kfree(tvp);
2171         }
2172
2173         return err;
2174 }
2175
2176 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2177                                       unsigned long arg)
2178 {
2179         struct dvb_device *dvbdev = file->private_data;
2180         struct dvb_frontend *fe = dvbdev->priv;
2181         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2182         int err;
2183
2184         if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2185                 if (down_interruptible(&fepriv->sem))
2186                         return -ERESTARTSYS;
2187
2188                 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2189
2190                 up(&fepriv->sem);
2191                 return err;
2192         }
2193
2194         return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2195 }
2196 #endif
2197
2198 static int dtv_set_frontend(struct dvb_frontend *fe)
2199 {
2200         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2201         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2202         struct dvb_frontend_tune_settings fetunesettings;
2203         u32 rolloff = 0;
2204
2205         if (dvb_frontend_check_parameters(fe) < 0)
2206                 return -EINVAL;
2207
2208         /*
2209          * Initialize output parameters to match the values given by
2210          * the user. FE_SET_FRONTEND triggers an initial frontend event
2211          * with status = 0, which copies output parameters to userspace.
2212          */
2213         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2214
2215         /*
2216          * Be sure that the bandwidth will be filled for all
2217          * non-satellite systems, as tuners need to know what
2218          * low pass/Nyquist half filter should be applied, in
2219          * order to avoid inter-channel noise.
2220          *
2221          * ISDB-T and DVB-T/T2 already sets bandwidth.
2222          * ATSC and DVB-C don't set, so, the core should fill it.
2223          *
2224          * On DVB-C Annex A and C, the bandwidth is a function of
2225          * the roll-off and symbol rate. Annex B defines different
2226          * roll-off factors depending on the modulation. Fortunately,
2227          * Annex B is only used with 6MHz, so there's no need to
2228          * calculate it.
2229          *
2230          * While not officially supported, a side effect of handling it at
2231          * the cache level is that a program could retrieve the bandwidth
2232          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2233          */
2234         switch (c->delivery_system) {
2235         case SYS_ATSC:
2236         case SYS_DVBC_ANNEX_B:
2237                 c->bandwidth_hz = 6000000;
2238                 break;
2239         case SYS_DVBC_ANNEX_A:
2240                 rolloff = 115;
2241                 break;
2242         case SYS_DVBC_ANNEX_C:
2243                 rolloff = 113;
2244                 break;
2245         case SYS_DVBS:
2246         case SYS_TURBO:
2247         case SYS_ISDBS:
2248                 rolloff = 135;
2249                 break;
2250         case SYS_DVBS2:
2251                 switch (c->rolloff) {
2252                 case ROLLOFF_20:
2253                         rolloff = 120;
2254                         break;
2255                 case ROLLOFF_25:
2256                         rolloff = 125;
2257                         break;
2258                 default:
2259                 case ROLLOFF_35:
2260                         rolloff = 135;
2261                 }
2262                 break;
2263         default:
2264                 break;
2265         }
2266         if (rolloff)
2267                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2268
2269         /* force auto frequency inversion if requested */
2270         if (dvb_force_auto_inversion)
2271                 c->inversion = INVERSION_AUTO;
2272
2273         /*
2274          * without hierarchical coding code_rate_LP is irrelevant,
2275          * so we tolerate the otherwise invalid FEC_NONE setting
2276          */
2277         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2278                 c->code_rate_LP = FEC_AUTO;
2279
2280         /* get frontend-specific tuning settings */
2281         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2282         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2283                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2284                 fepriv->max_drift = fetunesettings.max_drift;
2285                 fepriv->step_size = fetunesettings.step_size;
2286         } else {
2287                 /* default values */
2288                 switch (c->delivery_system) {
2289                 case SYS_DVBS:
2290                 case SYS_DVBS2:
2291                 case SYS_ISDBS:
2292                 case SYS_TURBO:
2293                 case SYS_DVBC_ANNEX_A:
2294                 case SYS_DVBC_ANNEX_C:
2295                         fepriv->min_delay = HZ / 20;
2296                         fepriv->step_size = c->symbol_rate / 16000;
2297                         fepriv->max_drift = c->symbol_rate / 2000;
2298                         break;
2299                 case SYS_DVBT:
2300                 case SYS_DVBT2:
2301                 case SYS_ISDBT:
2302                 case SYS_DTMB:
2303                         fepriv->min_delay = HZ / 20;
2304                         fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
2305                         fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
2306                         break;
2307                 default:
2308                         /*
2309                          * FIXME: This sounds wrong! if freqency_stepsize is
2310                          * defined by the frontend, why not use it???
2311                          */
2312                         fepriv->min_delay = HZ / 20;
2313                         fepriv->step_size = 0; /* no zigzag */
2314                         fepriv->max_drift = 0;
2315                         break;
2316                 }
2317         }
2318         if (dvb_override_tune_delay > 0)
2319                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2320
2321         fepriv->state = FESTATE_RETUNE;
2322
2323         /* Request the search algorithm to search */
2324         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2325
2326         dvb_frontend_clear_events(fe);
2327         dvb_frontend_add_event(fe, 0);
2328         dvb_frontend_wakeup(fe);
2329         fepriv->status = 0;
2330
2331         return 0;
2332 }
2333
2334 static int dvb_frontend_handle_ioctl(struct file *file,
2335                                      unsigned int cmd, void *parg)
2336 {
2337         struct dvb_device *dvbdev = file->private_data;
2338         struct dvb_frontend *fe = dvbdev->priv;
2339         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2340         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2341         int i, err = -ENOTSUPP;
2342
2343         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2344
2345         switch (cmd) {
2346         case FE_SET_PROPERTY: {
2347                 struct dtv_properties *tvps = parg;
2348                 struct dtv_property *tvp = NULL;
2349
2350                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2351                         __func__, tvps->num);
2352                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2353                         __func__, tvps->props);
2354
2355                 /*
2356                  * Put an arbitrary limit on the number of messages that can
2357                  * be sent at once
2358                  */
2359                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2360                         return -EINVAL;
2361
2362                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2363                 if (IS_ERR(tvp))
2364                         return PTR_ERR(tvp);
2365
2366                 for (i = 0; i < tvps->num; i++) {
2367                         err = dtv_property_process_set(fe, file,
2368                                                        (tvp + i)->cmd,
2369                                                        (tvp + i)->u.data);
2370                         if (err < 0) {
2371                                 kfree(tvp);
2372                                 return err;
2373                         }
2374                 }
2375                 kfree(tvp);
2376                 err = 0;
2377                 break;
2378         }
2379         case FE_GET_PROPERTY: {
2380                 struct dtv_properties *tvps = parg;
2381                 struct dtv_property *tvp = NULL;
2382                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2383
2384                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2385                         __func__, tvps->num);
2386                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2387                         __func__, tvps->props);
2388
2389                 /*
2390                  * Put an arbitrary limit on the number of messages that can
2391                  * be sent at once
2392                  */
2393                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2394                         return -EINVAL;
2395
2396                 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2397                 if (IS_ERR(tvp))
2398                         return PTR_ERR(tvp);
2399
2400                 /*
2401                  * Let's use our own copy of property cache, in order to
2402                  * avoid mangling with DTV zigzag logic, as drivers might
2403                  * return crap, if they don't check if the data is available
2404                  * before updating the properties cache.
2405                  */
2406                 if (fepriv->state != FESTATE_IDLE) {
2407                         err = dtv_get_frontend(fe, &getp, NULL);
2408                         if (err < 0) {
2409                                 kfree(tvp);
2410                                 return err;
2411                         }
2412                 }
2413                 for (i = 0; i < tvps->num; i++) {
2414                         err = dtv_property_process_get(fe, &getp,
2415                                                        tvp + i, file);
2416                         if (err < 0) {
2417                                 kfree(tvp);
2418                                 return err;
2419                         }
2420                 }
2421
2422                 if (copy_to_user((void __user *)tvps->props, tvp,
2423                                  tvps->num * sizeof(struct dtv_property))) {
2424                         kfree(tvp);
2425                         return -EFAULT;
2426                 }
2427                 kfree(tvp);
2428                 err = 0;
2429                 break;
2430         }
2431
2432         case FE_GET_INFO: {
2433                 struct dvb_frontend_info *info = parg;
2434                 memset(info, 0, sizeof(*info));
2435
2436                 strcpy(info->name, fe->ops.info.name);
2437                 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2438                 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2439                 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2440                 info->caps = fe->ops.info.caps;
2441                 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2442                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2443                                                   &info->frequency_max,
2444                                                   &info->frequency_tolerance);
2445
2446                 /*
2447                  * Associate the 4 delivery systems supported by DVBv3
2448                  * API with their DVBv5 counterpart. For the other standards,
2449                  * use the closest type, assuming that it would hopefully
2450                  * work with a DVBv3 application.
2451                  * It should be noticed that, on multi-frontend devices with
2452                  * different types (terrestrial and cable, for example),
2453                  * a pure DVBv3 application won't be able to use all delivery
2454                  * systems. Yet, changing the DVBv5 cache to the other delivery
2455                  * system should be enough for making it work.
2456                  */
2457                 switch (dvbv3_type(c->delivery_system)) {
2458                 case DVBV3_QPSK:
2459                         info->type = FE_QPSK;
2460                         break;
2461                 case DVBV3_ATSC:
2462                         info->type = FE_ATSC;
2463                         break;
2464                 case DVBV3_QAM:
2465                         info->type = FE_QAM;
2466                         break;
2467                 case DVBV3_OFDM:
2468                         info->type = FE_OFDM;
2469                         break;
2470                 default:
2471                         dev_err(fe->dvb->device,
2472                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2473                                 __func__, c->delivery_system);
2474                         info->type = FE_OFDM;
2475                 }
2476                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2477                         __func__, c->delivery_system, info->type);
2478
2479                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2480                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2481                         info->caps |= FE_CAN_INVERSION_AUTO;
2482                 err = 0;
2483                 break;
2484         }
2485
2486         case FE_READ_STATUS: {
2487                 enum fe_status *status = parg;
2488
2489                 /* if retune was requested but hasn't occurred yet, prevent
2490                  * that user get signal state from previous tuning */
2491                 if (fepriv->state == FESTATE_RETUNE ||
2492                     fepriv->state == FESTATE_ERROR) {
2493                         err = 0;
2494                         *status = 0;
2495                         break;
2496                 }
2497
2498                 if (fe->ops.read_status)
2499                         err = fe->ops.read_status(fe, status);
2500                 break;
2501         }
2502
2503         case FE_DISEQC_RESET_OVERLOAD:
2504                 if (fe->ops.diseqc_reset_overload) {
2505                         err = fe->ops.diseqc_reset_overload(fe);
2506                         fepriv->state = FESTATE_DISEQC;
2507                         fepriv->status = 0;
2508                 }
2509                 break;
2510
2511         case FE_DISEQC_SEND_MASTER_CMD:
2512                 if (fe->ops.diseqc_send_master_cmd) {
2513                         struct dvb_diseqc_master_cmd *cmd = parg;
2514
2515                         if (cmd->msg_len > sizeof(cmd->msg)) {
2516                                 err = -EINVAL;
2517                                 break;
2518                         }
2519                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2520                         fepriv->state = FESTATE_DISEQC;
2521                         fepriv->status = 0;
2522                 }
2523                 break;
2524
2525         case FE_DISEQC_SEND_BURST:
2526                 if (fe->ops.diseqc_send_burst) {
2527                         err = fe->ops.diseqc_send_burst(fe,
2528                                                 (enum fe_sec_mini_cmd)parg);
2529                         fepriv->state = FESTATE_DISEQC;
2530                         fepriv->status = 0;
2531                 }
2532                 break;
2533
2534         case FE_SET_TONE:
2535                 if (fe->ops.set_tone) {
2536                         err = fe->ops.set_tone(fe,
2537                                                (enum fe_sec_tone_mode)parg);
2538                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2539                         fepriv->state = FESTATE_DISEQC;
2540                         fepriv->status = 0;
2541                 }
2542                 break;
2543
2544         case FE_SET_VOLTAGE:
2545                 if (fe->ops.set_voltage) {
2546                         err = fe->ops.set_voltage(fe,
2547                                                   (enum fe_sec_voltage)parg);
2548                         fepriv->voltage = (enum fe_sec_voltage)parg;
2549                         fepriv->state = FESTATE_DISEQC;
2550                         fepriv->status = 0;
2551                 }
2552                 break;
2553
2554         case FE_DISEQC_RECV_SLAVE_REPLY:
2555                 if (fe->ops.diseqc_recv_slave_reply)
2556                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2557                 break;
2558
2559         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2560                 if (fe->ops.enable_high_lnb_voltage)
2561                         err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2562                 break;
2563
2564         case FE_SET_FRONTEND_TUNE_MODE:
2565                 fepriv->tune_mode_flags = (unsigned long)parg;
2566                 err = 0;
2567                 break;
2568
2569         /* DEPRECATED dish control ioctls */
2570
2571         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2572                 if (fe->ops.dishnetwork_send_legacy_command) {
2573                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2574                                                          (unsigned long)parg);
2575                         fepriv->state = FESTATE_DISEQC;
2576                         fepriv->status = 0;
2577                 } else if (fe->ops.set_voltage) {
2578                         /*
2579                          * NOTE: This is a fallback condition.  Some frontends
2580                          * (stv0299 for instance) take longer than 8msec to
2581                          * respond to a set_voltage command.  Those switches
2582                          * need custom routines to switch properly.  For all
2583                          * other frontends, the following should work ok.
2584                          * Dish network legacy switches (as used by Dish500)
2585                          * are controlled by sending 9-bit command words
2586                          * spaced 8msec apart.
2587                          * the actual command word is switch/port dependent
2588                          * so it is up to the userspace application to send
2589                          * the right command.
2590                          * The command must always start with a '0' after
2591                          * initialization, so parg is 8 bits and does not
2592                          * include the initialization or start bit
2593                          */
2594                         unsigned long swcmd = ((unsigned long)parg) << 1;
2595                         ktime_t nexttime;
2596                         ktime_t tv[10];
2597                         int i;
2598                         u8 last = 1;
2599
2600                         if (dvb_frontend_debug)
2601                                 dprintk("%s switch command: 0x%04lx\n",
2602                                         __func__, swcmd);
2603                         nexttime = ktime_get_boottime();
2604                         if (dvb_frontend_debug)
2605                                 tv[0] = nexttime;
2606                         /* before sending a command, initialize by sending
2607                          * a 32ms 18V to the switch
2608                          */
2609                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2610                         dvb_frontend_sleep_until(&nexttime, 32000);
2611
2612                         for (i = 0; i < 9; i++) {
2613                                 if (dvb_frontend_debug)
2614                                         tv[i + 1] = ktime_get_boottime();
2615                                 if ((swcmd & 0x01) != last) {
2616                                         /* set voltage to (last ? 13V : 18V) */
2617                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2618                                         last = (last) ? 0 : 1;
2619                                 }
2620                                 swcmd = swcmd >> 1;
2621                                 if (i != 8)
2622                                         dvb_frontend_sleep_until(&nexttime, 8000);
2623                         }
2624                         if (dvb_frontend_debug) {
2625                                 dprintk("%s(%d): switch delay (should be 32k followed by all 8k)\n",
2626                                         __func__, fe->dvb->num);
2627                                 for (i = 1; i < 10; i++)
2628                                         pr_info("%d: %d\n", i,
2629                                                 (int)ktime_us_delta(tv[i], tv[i - 1]));
2630                         }
2631                         err = 0;
2632                         fepriv->state = FESTATE_DISEQC;
2633                         fepriv->status = 0;
2634                 }
2635                 break;
2636
2637         /* DEPRECATED statistics ioctls */
2638
2639         case FE_READ_BER:
2640                 if (fe->ops.read_ber) {
2641                         if (fepriv->thread)
2642                                 err = fe->ops.read_ber(fe, parg);
2643                         else
2644                                 err = -EAGAIN;
2645                 }
2646                 break;
2647
2648         case FE_READ_SIGNAL_STRENGTH:
2649                 if (fe->ops.read_signal_strength) {
2650                         if (fepriv->thread)
2651                                 err = fe->ops.read_signal_strength(fe, parg);
2652                         else
2653                                 err = -EAGAIN;
2654                 }
2655                 break;
2656
2657         case FE_READ_SNR:
2658                 if (fe->ops.read_snr) {
2659                         if (fepriv->thread)
2660                                 err = fe->ops.read_snr(fe, parg);
2661                         else
2662                                 err = -EAGAIN;
2663                 }
2664                 break;
2665
2666         case FE_READ_UNCORRECTED_BLOCKS:
2667                 if (fe->ops.read_ucblocks) {
2668                         if (fepriv->thread)
2669                                 err = fe->ops.read_ucblocks(fe, parg);
2670                         else
2671                                 err = -EAGAIN;
2672                 }
2673                 break;
2674
2675         /* DEPRECATED DVBv3 ioctls */
2676
2677         case FE_SET_FRONTEND:
2678                 err = dvbv3_set_delivery_system(fe);
2679                 if (err)
2680                         break;
2681
2682                 err = dtv_property_cache_sync(fe, c, parg);
2683                 if (err)
2684                         break;
2685                 err = dtv_set_frontend(fe);
2686                 break;
2687         case FE_GET_EVENT:
2688                 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2689                 break;
2690
2691         case FE_GET_FRONTEND: {
2692                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2693
2694                 /*
2695                  * Let's use our own copy of property cache, in order to
2696                  * avoid mangling with DTV zigzag logic, as drivers might
2697                  * return crap, if they don't check if the data is available
2698                  * before updating the properties cache.
2699                  */
2700                 err = dtv_get_frontend(fe, &getp, parg);
2701                 break;
2702         }
2703
2704         default:
2705                 return -ENOTSUPP;
2706         } /* switch */
2707
2708         return err;
2709 }
2710
2711 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2712 {
2713         struct dvb_device *dvbdev = file->private_data;
2714         struct dvb_frontend *fe = dvbdev->priv;
2715         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2716
2717         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2718
2719         poll_wait(file, &fepriv->events.wait_queue, wait);
2720
2721         if (fepriv->events.eventw != fepriv->events.eventr)
2722                 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2723
2724         return 0;
2725 }
2726
2727 static int dvb_frontend_open(struct inode *inode, struct file *file)
2728 {
2729         struct dvb_device *dvbdev = file->private_data;
2730         struct dvb_frontend *fe = dvbdev->priv;
2731         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2732         struct dvb_adapter *adapter = fe->dvb;
2733         int ret;
2734
2735         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2736         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2737                 return -ENODEV;
2738
2739         if (adapter->mfe_shared) {
2740                 mutex_lock(&adapter->mfe_lock);
2741
2742                 if (!adapter->mfe_dvbdev)
2743                         adapter->mfe_dvbdev = dvbdev;
2744
2745                 else if (adapter->mfe_dvbdev != dvbdev) {
2746                         struct dvb_device
2747                                 *mfedev = adapter->mfe_dvbdev;
2748                         struct dvb_frontend
2749                                 *mfe = mfedev->priv;
2750                         struct dvb_frontend_private
2751                                 *mfepriv = mfe->frontend_priv;
2752                         int mferetry = (dvb_mfe_wait_time << 1);
2753
2754                         mutex_unlock(&adapter->mfe_lock);
2755                         while (mferetry-- && (mfedev->users != -1 ||
2756                                               mfepriv->thread)) {
2757                                 if (msleep_interruptible(500)) {
2758                                         if (signal_pending(current))
2759                                                 return -EINTR;
2760                                 }
2761                         }
2762
2763                         mutex_lock(&adapter->mfe_lock);
2764                         if (adapter->mfe_dvbdev != dvbdev) {
2765                                 mfedev = adapter->mfe_dvbdev;
2766                                 mfe = mfedev->priv;
2767                                 mfepriv = mfe->frontend_priv;
2768                                 if (mfedev->users != -1 ||
2769                                     mfepriv->thread) {
2770                                         mutex_unlock(&adapter->mfe_lock);
2771                                         return -EBUSY;
2772                                 }
2773                                 adapter->mfe_dvbdev = dvbdev;
2774                         }
2775                 }
2776         }
2777
2778         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2779                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2780                         goto err0;
2781
2782                 /* If we took control of the bus, we need to force
2783                    reinitialization.  This is because many ts_bus_ctrl()
2784                    functions strobe the RESET pin on the demod, and if the
2785                    frontend thread already exists then the dvb_init() routine
2786                    won't get called (which is what usually does initial
2787                    register configuration). */
2788                 fepriv->reinitialise = 1;
2789         }
2790
2791         if ((ret = dvb_generic_open(inode, file)) < 0)
2792                 goto err1;
2793
2794         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2795                 /* normal tune mode when opened R/W */
2796                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2797                 fepriv->tone = -1;
2798                 fepriv->voltage = -1;
2799
2800 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2801                 mutex_lock(&fe->dvb->mdev_lock);
2802                 if (fe->dvb->mdev) {
2803                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2804                         if (fe->dvb->mdev->enable_source)
2805                                 ret = fe->dvb->mdev->enable_source(
2806                                                            dvbdev->entity,
2807                                                            &fepriv->pipe);
2808                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2809                         if (ret) {
2810                                 mutex_unlock(&fe->dvb->mdev_lock);
2811                                 dev_err(fe->dvb->device,
2812                                         "Tuner is busy. Error %d\n", ret);
2813                                 goto err2;
2814                         }
2815                 }
2816                 mutex_unlock(&fe->dvb->mdev_lock);
2817 #endif
2818                 ret = dvb_frontend_start(fe);
2819                 if (ret)
2820                         goto err3;
2821
2822                 /*  empty event queue */
2823                 fepriv->events.eventr = fepriv->events.eventw = 0;
2824         }
2825
2826         dvb_frontend_get(fe);
2827
2828         if (adapter->mfe_shared)
2829                 mutex_unlock(&adapter->mfe_lock);
2830         return ret;
2831
2832 err3:
2833 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2834         mutex_lock(&fe->dvb->mdev_lock);
2835         if (fe->dvb->mdev) {
2836                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2837                 if (fe->dvb->mdev->disable_source)
2838                         fe->dvb->mdev->disable_source(dvbdev->entity);
2839                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2840         }
2841         mutex_unlock(&fe->dvb->mdev_lock);
2842 err2:
2843 #endif
2844         dvb_generic_release(inode, file);
2845 err1:
2846         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2847                 fe->ops.ts_bus_ctrl(fe, 0);
2848 err0:
2849         if (adapter->mfe_shared)
2850                 mutex_unlock(&adapter->mfe_lock);
2851         return ret;
2852 }
2853
2854 static int dvb_frontend_release(struct inode *inode, struct file *file)
2855 {
2856         struct dvb_device *dvbdev = file->private_data;
2857         struct dvb_frontend *fe = dvbdev->priv;
2858         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2859         int ret;
2860
2861         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2862
2863         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2864                 fepriv->release_jiffies = jiffies;
2865                 mb();
2866         }
2867
2868         ret = dvb_generic_release(inode, file);
2869
2870         if (dvbdev->users == -1) {
2871                 wake_up(&fepriv->wait_queue);
2872 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2873                 mutex_lock(&fe->dvb->mdev_lock);
2874                 if (fe->dvb->mdev) {
2875                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2876                         if (fe->dvb->mdev->disable_source)
2877                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2878                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2879                 }
2880                 mutex_unlock(&fe->dvb->mdev_lock);
2881 #endif
2882                 if (fe->exit != DVB_FE_NO_EXIT)
2883                         wake_up(&dvbdev->wait_queue);
2884                 if (fe->ops.ts_bus_ctrl)
2885                         fe->ops.ts_bus_ctrl(fe, 0);
2886         }
2887
2888         dvb_frontend_put(fe);
2889
2890         return ret;
2891 }
2892
2893 static const struct file_operations dvb_frontend_fops = {
2894         .owner          = THIS_MODULE,
2895         .unlocked_ioctl = dvb_frontend_ioctl,
2896 #ifdef CONFIG_COMPAT
2897         .compat_ioctl   = dvb_frontend_compat_ioctl,
2898 #endif
2899         .poll           = dvb_frontend_poll,
2900         .open           = dvb_frontend_open,
2901         .release        = dvb_frontend_release,
2902         .llseek         = noop_llseek,
2903 };
2904
2905 int dvb_frontend_suspend(struct dvb_frontend *fe)
2906 {
2907         int ret = 0;
2908
2909         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2910                 fe->id);
2911
2912         if (fe->ops.tuner_ops.suspend)
2913                 ret = fe->ops.tuner_ops.suspend(fe);
2914         else if (fe->ops.tuner_ops.sleep)
2915                 ret = fe->ops.tuner_ops.sleep(fe);
2916
2917         if (fe->ops.sleep)
2918                 ret = fe->ops.sleep(fe);
2919
2920         return ret;
2921 }
2922 EXPORT_SYMBOL(dvb_frontend_suspend);
2923
2924 int dvb_frontend_resume(struct dvb_frontend *fe)
2925 {
2926         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2927         int ret = 0;
2928
2929         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2930                 fe->id);
2931
2932         fe->exit = DVB_FE_DEVICE_RESUME;
2933         if (fe->ops.init)
2934                 ret = fe->ops.init(fe);
2935
2936         if (fe->ops.tuner_ops.resume)
2937                 ret = fe->ops.tuner_ops.resume(fe);
2938         else if (fe->ops.tuner_ops.init)
2939                 ret = fe->ops.tuner_ops.init(fe);
2940
2941         if (fe->ops.set_tone && fepriv->tone != -1)
2942                 fe->ops.set_tone(fe, fepriv->tone);
2943         if (fe->ops.set_voltage && fepriv->voltage != -1)
2944                 fe->ops.set_voltage(fe, fepriv->voltage);
2945
2946         fe->exit = DVB_FE_NO_EXIT;
2947         fepriv->state = FESTATE_RETUNE;
2948         dvb_frontend_wakeup(fe);
2949
2950         return ret;
2951 }
2952 EXPORT_SYMBOL(dvb_frontend_resume);
2953
2954 int dvb_register_frontend(struct dvb_adapter *dvb,
2955                           struct dvb_frontend *fe)
2956 {
2957         struct dvb_frontend_private *fepriv;
2958         const struct dvb_device dvbdev_template = {
2959                 .users = ~0,
2960                 .writers = 1,
2961                 .readers = (~0) - 1,
2962                 .fops = &dvb_frontend_fops,
2963 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2964                 .name = fe->ops.info.name,
2965 #endif
2966         };
2967         int ret;
2968
2969         dev_dbg(dvb->device, "%s:\n", __func__);
2970
2971         if (mutex_lock_interruptible(&frontend_mutex))
2972                 return -ERESTARTSYS;
2973
2974         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2975         if (!fe->frontend_priv) {
2976                 mutex_unlock(&frontend_mutex);
2977                 return -ENOMEM;
2978         }
2979         fepriv = fe->frontend_priv;
2980
2981         kref_init(&fe->refcount);
2982
2983         /*
2984          * After initialization, there need to be two references: one
2985          * for dvb_unregister_frontend(), and another one for
2986          * dvb_frontend_detach().
2987          */
2988         dvb_frontend_get(fe);
2989
2990         sema_init(&fepriv->sem, 1);
2991         init_waitqueue_head(&fepriv->wait_queue);
2992         init_waitqueue_head(&fepriv->events.wait_queue);
2993         mutex_init(&fepriv->events.mtx);
2994         fe->dvb = dvb;
2995         fepriv->inversion = INVERSION_OFF;
2996
2997         dev_info(fe->dvb->device,
2998                  "DVB: registering adapter %i frontend %i (%s)...\n",
2999                  fe->dvb->num, fe->id, fe->ops.info.name);
3000
3001         ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3002                             fe, DVB_DEVICE_FRONTEND, 0);
3003         if (ret) {
3004                 dvb_frontend_put(fe);
3005                 mutex_unlock(&frontend_mutex);
3006                 return ret;
3007         }
3008
3009         /*
3010          * Initialize the cache to the proper values according with the
3011          * first supported delivery system (ops->delsys[0])
3012          */
3013
3014         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3015         dvb_frontend_clear_cache(fe);
3016
3017         mutex_unlock(&frontend_mutex);
3018         return 0;
3019 }
3020 EXPORT_SYMBOL(dvb_register_frontend);
3021
3022 int dvb_unregister_frontend(struct dvb_frontend *fe)
3023 {
3024         struct dvb_frontend_private *fepriv = fe->frontend_priv;
3025
3026         dev_dbg(fe->dvb->device, "%s:\n", __func__);
3027
3028         mutex_lock(&frontend_mutex);
3029         dvb_frontend_stop(fe);
3030         dvb_remove_device(fepriv->dvbdev);
3031
3032         /* fe is invalid now */
3033         mutex_unlock(&frontend_mutex);
3034         dvb_frontend_put(fe);
3035         return 0;
3036 }
3037 EXPORT_SYMBOL(dvb_unregister_frontend);
3038
3039 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3040                                         void (*release)(struct dvb_frontend *fe))
3041 {
3042         if (release) {
3043                 release(fe);
3044 #ifdef CONFIG_MEDIA_ATTACH
3045                 dvb_detach(release);
3046 #endif
3047         }
3048 }
3049
3050 void dvb_frontend_detach(struct dvb_frontend *fe)
3051 {
3052         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3053         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3054         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3055         dvb_frontend_put(fe);
3056 }
3057 EXPORT_SYMBOL(dvb_frontend_detach);