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 <asm/processor.h>
  44
  45 #include "dvb_frontend.h"
  46 #include "dvbdev.h"
  47 #include <linux/dvb/version.h>
  48
  49 static int dvb_frontend_debug;
  50 static int dvb_shutdown_timeout;
  51 static int dvb_force_auto_inversion;
  52 static int dvb_override_tune_delay;
  53 static int dvb_powerdown_on_sleep = 1;
  54 static int dvb_mfe_wait_time = 5;
  55
  56 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  57 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  58 module_param(dvb_shutdown_timeout, int, 0644);
  59 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  60 module_param(dvb_force_auto_inversion, int, 0644);
  61 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  62 module_param(dvb_override_tune_delay, int, 0644);
  63 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  64 module_param(dvb_powerdown_on_sleep, int, 0644);
  65 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  66 module_param(dvb_mfe_wait_time, int, 0644);
  67 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)");
  68
  69 #define dprintk(fmt, arg...) \
  70         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  71
  72 #define FESTATE_IDLE 1
  73 #define FESTATE_RETUNE 2
  74 #define FESTATE_TUNING_FAST 4
  75 #define FESTATE_TUNING_SLOW 8
  76 #define FESTATE_TUNED 16
  77 #define FESTATE_ZIGZAG_FAST 32
  78 #define FESTATE_ZIGZAG_SLOW 64
  79 #define FESTATE_DISEQC 128
  80 #define FESTATE_ERROR 256
  81 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  82 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  83 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  84 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  85
  86 /*
  87  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  88  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  89  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  90  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  91  * FESTATE_TUNED. The frontend has successfully locked on.
  92  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  93  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  94  * FESTATE_DISEQC. A DISEQC command has just been issued.
  95  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  96  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  97  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  98  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  99  */
 100
 101 static DEFINE_MUTEX(frontend_mutex);
 102
 103 struct dvb_frontend_private {
 104         /* thread/frontend values */
 105         struct dvb_device *dvbdev;
 106         struct dvb_frontend_parameters parameters_out;
 107         struct dvb_fe_events events;
 108         struct semaphore sem;
 109         struct list_head list_head;
 110         wait_queue_head_t wait_queue;
 111         struct task_struct *thread;
 112         unsigned long release_jiffies;
 113         unsigned int wakeup;
 114         enum fe_status status;
 115         unsigned long tune_mode_flags;
 116         unsigned int delay;
 117         unsigned int reinitialise;
 118         int tone;
 119         int voltage;
 120
 121         /* swzigzag values */
 122         unsigned int state;
 123         unsigned int bending;
 124         int lnb_drift;
 125         unsigned int inversion;
 126         unsigned int auto_step;
 127         unsigned int auto_sub_step;
 128         unsigned int started_auto_step;
 129         unsigned int min_delay;
 130         unsigned int max_drift;
 131         unsigned int step_size;
 132         int quality;
 133         unsigned int check_wrapped;
 134         enum dvbfe_search algo_status;
 135
 136 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 137         struct media_pipeline pipe;
 138 #endif
 139 };
 140
 141 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 142                                         void (*release)(struct dvb_frontend *fe));
 143
 144 static void __dvb_frontend_free(struct dvb_frontend *fe)
 145 {
 146         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 147
 148         if (fepriv)
 149                 dvb_free_device(fepriv->dvbdev);
 150
 151         dvb_frontend_invoke_release(fe, fe->ops.release);
 152
 153         if (fepriv)
 154                 kfree(fepriv);
 155 }
 156
 157 static void dvb_frontend_free(struct kref *ref)
 158 {
 159         struct dvb_frontend *fe =
 160                 container_of(ref, struct dvb_frontend, refcount);
 161
 162         __dvb_frontend_free(fe);
 163 }
 164
 165 static void dvb_frontend_put(struct dvb_frontend *fe)
 166 {
 167         /*
 168          * Check if the frontend was registered, as otherwise
 169          * kref was not initialized yet.
 170          */
 171         if (fe->frontend_priv)
 172                 kref_put(&fe->refcount, dvb_frontend_free);
 173         else
 174                 __dvb_frontend_free(fe);
 175 }
 176
 177 static void dvb_frontend_get(struct dvb_frontend *fe)
 178 {
 179         kref_get(&fe->refcount);
 180 }
 181
 182 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 183 static int dtv_get_frontend(struct dvb_frontend *fe,
 184                             struct dtv_frontend_properties *c,
 185                             struct dvb_frontend_parameters *p_out);
 186 static int
 187 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 188                                 const struct dtv_frontend_properties *c,
 189                                 struct dvb_frontend_parameters *p);
 190
 191 static bool has_get_frontend(struct dvb_frontend *fe)
 192 {
 193         return fe->ops.get_frontend != NULL;
 194 }
 195
 196 /*
 197  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 198  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 199  * otherwise, a DVBv3 call will fail.
 200  */
 201 enum dvbv3_emulation_type {
 202         DVBV3_UNKNOWN,
 203         DVBV3_QPSK,
 204         DVBV3_QAM,
 205         DVBV3_OFDM,
 206         DVBV3_ATSC,
 207 };
 208
 209 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 210 {
 211         switch (delivery_system) {
 212         case SYS_DVBC_ANNEX_A:
 213         case SYS_DVBC_ANNEX_C:
 214                 return DVBV3_QAM;
 215         case SYS_DVBS:
 216         case SYS_DVBS2:
 217         case SYS_TURBO:
 218         case SYS_ISDBS:
 219         case SYS_DSS:
 220                 return DVBV3_QPSK;
 221         case SYS_DVBT:
 222         case SYS_DVBT2:
 223         case SYS_ISDBT:
 224         case SYS_DTMB:
 225                 return DVBV3_OFDM;
 226         case SYS_ATSC:
 227         case SYS_ATSCMH:
 228         case SYS_DVBC_ANNEX_B:
 229                 return DVBV3_ATSC;
 230         case SYS_UNDEFINED:
 231         case SYS_ISDBC:
 232         case SYS_DVBH:
 233         case SYS_DAB:
 234         default:
 235                 /*
 236                  * Doesn't know how to emulate those types and/or
 237                  * there's no frontend driver from this type yet
 238                  * with some emulation code, so, we're not sure yet how
 239                  * to handle them, or they're not compatible with a DVBv3 call.
 240                  */
 241                 return DVBV3_UNKNOWN;
 242         }
 243 }
 244
 245 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 246                                    enum fe_status status)
 247 {
 248         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 249         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 250         struct dvb_fe_events *events = &fepriv->events;
 251         struct dvb_frontend_event *e;
 252         int wp;
 253
 254         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 255
 256         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 257                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 258
 259         mutex_lock(&events->mtx);
 260
 261         wp = (events->eventw + 1) % MAX_EVENT;
 262         if (wp == events->eventr) {
 263                 events->overflow = 1;
 264                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 265         }
 266
 267         e = &events->events[events->eventw];
 268         e->status = status;
 269         e->parameters = fepriv->parameters_out;
 270
 271         events->eventw = wp;
 272
 273         mutex_unlock(&events->mtx);
 274
 275         wake_up_interruptible (&events->wait_queue);
 276 }
 277
 278 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
 279                                    struct dvb_fe_events *events)
 280 {
 281         int ret;
 282
 283         up(&fepriv->sem);
 284         ret = events->eventw != events->eventr;
 285         down(&fepriv->sem);
 286
 287         return ret;
 288 }
 289
 290 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 291                                   struct dvb_frontend_event *event, int flags)
 292 {
 293         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 294         struct dvb_fe_events *events = &fepriv->events;
 295
 296         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 297
 298         if (events->overflow) {
 299                 events->overflow = 0;
 300                 return -EOVERFLOW;
 301         }
 302
 303         if (events->eventw == events->eventr) {
 304                 int ret;
 305
 306                 if (flags & O_NONBLOCK)
 307                         return -EWOULDBLOCK;
 308
 309                 ret = wait_event_interruptible(events->wait_queue,
 310                                                dvb_frontend_test_event(fepriv, events));
 311
 312                 if (ret < 0)
 313                         return ret;
 314         }
 315
 316         mutex_lock(&events->mtx);
 317         *event = events->events[events->eventr];
 318         events->eventr = (events->eventr + 1) % MAX_EVENT;
 319         mutex_unlock(&events->mtx);
 320
 321         return 0;
 322 }
 323
 324 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 325 {
 326         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 327         struct dvb_fe_events *events = &fepriv->events;
 328
 329         mutex_lock(&events->mtx);
 330         events->eventr = events->eventw;
 331         mutex_unlock(&events->mtx);
 332 }
 333
 334 static void dvb_frontend_init(struct dvb_frontend *fe)
 335 {
 336         dev_dbg(fe->dvb->device,
 337                         "%s: initialising adapter %i frontend %i (%s)...\n",
 338                         __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 339
 340         if (fe->ops.init)
 341                 fe->ops.init(fe);
 342         if (fe->ops.tuner_ops.init) {
 343                 if (fe->ops.i2c_gate_ctrl)
 344                         fe->ops.i2c_gate_ctrl(fe, 1);
 345                 fe->ops.tuner_ops.init(fe);
 346                 if (fe->ops.i2c_gate_ctrl)
 347                         fe->ops.i2c_gate_ctrl(fe, 0);
 348         }
 349 }
 350
 351 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 352 {
 353         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 354
 355         fepriv->reinitialise = 1;
 356         dvb_frontend_wakeup(fe);
 357 }
 358 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 359
 360 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 361 {
 362         int q2;
 363         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 364
 365         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 366
 367         if (locked)
 368                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 369         else
 370                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 371
 372         q2 = fepriv->quality - 128;
 373         q2 *= q2;
 374
 375         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 376 }
 377
 378 /**
 379  * Performs automatic twiddling of frontend parameters.
 380  *
 381  * @param fe The frontend concerned.
 382  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 383  * @returns Number of complete iterations that have been performed.
 384  */
 385 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 386 {
 387         int autoinversion;
 388         int ready = 0;
 389         int fe_set_err = 0;
 390         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 391         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 392         int original_inversion = c->inversion;
 393         u32 original_frequency = c->frequency;
 394
 395         /* are we using autoinversion? */
 396         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 397                          (c->inversion == INVERSION_AUTO));
 398
 399         /* setup parameters correctly */
 400         while(!ready) {
 401                 /* calculate the lnb_drift */
 402                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 403
 404                 /* wrap the auto_step if we've exceeded the maximum drift */
 405                 if (fepriv->lnb_drift > fepriv->max_drift) {
 406                         fepriv->auto_step = 0;
 407                         fepriv->auto_sub_step = 0;
 408                         fepriv->lnb_drift = 0;
 409                 }
 410
 411                 /* perform inversion and +/- zigzag */
 412                 switch(fepriv->auto_sub_step) {
 413                 case 0:
 414                         /* try with the current inversion and current drift setting */
 415                         ready = 1;
 416                         break;
 417
 418                 case 1:
 419                         if (!autoinversion) break;
 420
 421                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 422                         ready = 1;
 423                         break;
 424
 425                 case 2:
 426                         if (fepriv->lnb_drift == 0) break;
 427
 428                         fepriv->lnb_drift = -fepriv->lnb_drift;
 429                         ready = 1;
 430                         break;
 431
 432                 case 3:
 433                         if (fepriv->lnb_drift == 0) break;
 434                         if (!autoinversion) break;
 435
 436                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 437                         fepriv->lnb_drift = -fepriv->lnb_drift;
 438                         ready = 1;
 439                         break;
 440
 441                 default:
 442                         fepriv->auto_step++;
 443                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 444                         break;
 445                 }
 446
 447                 if (!ready) fepriv->auto_sub_step++;
 448         }
 449
 450         /* if this attempt would hit where we started, indicate a complete
 451          * iteration has occurred */
 452         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 453             (fepriv->auto_sub_step == 0) && check_wrapped) {
 454                 return 1;
 455         }
 456
 457         dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \
 458                         "auto_sub_step:%i started_auto_step:%i\n",
 459                         __func__, fepriv->lnb_drift, fepriv->inversion,
 460                         fepriv->auto_step, fepriv->auto_sub_step,
 461                         fepriv->started_auto_step);
 462
 463         /* set the frontend itself */
 464         c->frequency += fepriv->lnb_drift;
 465         if (autoinversion)
 466                 c->inversion = fepriv->inversion;
 467         tmp = *c;
 468         if (fe->ops.set_frontend)
 469                 fe_set_err = fe->ops.set_frontend(fe);
 470         *c = tmp;
 471         if (fe_set_err < 0) {
 472                 fepriv->state = FESTATE_ERROR;
 473                 return fe_set_err;
 474         }
 475
 476         c->frequency = original_frequency;
 477         c->inversion = original_inversion;
 478
 479         fepriv->auto_sub_step++;
 480         return 0;
 481 }
 482
 483 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 484 {
 485         enum fe_status s = FE_NONE;
 486         int retval = 0;
 487         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 488         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 489
 490         /* if we've got no parameters, just keep idling */
 491         if (fepriv->state & FESTATE_IDLE) {
 492                 fepriv->delay = 3*HZ;
 493                 fepriv->quality = 0;
 494                 return;
 495         }
 496
 497         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 498         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 499                 if (fepriv->state & FESTATE_RETUNE) {
 500                         tmp = *c;
 501                         if (fe->ops.set_frontend)
 502                                 retval = fe->ops.set_frontend(fe);
 503                         *c = tmp;
 504                         if (retval < 0)
 505                                 fepriv->state = FESTATE_ERROR;
 506                         else
 507                                 fepriv->state = FESTATE_TUNED;
 508                 }
 509                 fepriv->delay = 3*HZ;
 510                 fepriv->quality = 0;
 511                 return;
 512         }
 513
 514         /* get the frontend status */
 515         if (fepriv->state & FESTATE_RETUNE) {
 516                 s = 0;
 517         } else {
 518                 if (fe->ops.read_status)
 519                         fe->ops.read_status(fe, &s);
 520                 if (s != fepriv->status) {
 521                         dvb_frontend_add_event(fe, s);
 522                         fepriv->status = s;
 523                 }
 524         }
 525
 526         /* if we're not tuned, and we have a lock, move to the TUNED state */
 527         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 528                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 529                 fepriv->state = FESTATE_TUNED;
 530
 531                 /* if we're tuned, then we have determined the correct inversion */
 532                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 533                     (c->inversion == INVERSION_AUTO)) {
 534                         c->inversion = fepriv->inversion;
 535                 }
 536                 return;
 537         }
 538
 539         /* if we are tuned already, check we're still locked */
 540         if (fepriv->state & FESTATE_TUNED) {
 541                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 542
 543                 /* we're tuned, and the lock is still good... */
 544                 if (s & FE_HAS_LOCK) {
 545                         return;
 546                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 547                         fepriv->state = FESTATE_ZIGZAG_FAST;
 548                         fepriv->started_auto_step = fepriv->auto_step;
 549                         fepriv->check_wrapped = 0;
 550                 }
 551         }
 552
 553         /* don't actually do anything if we're in the LOSTLOCK state,
 554          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 555         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 556             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 557                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 558                 return;
 559         }
 560
 561         /* don't do anything if we're in the DISEQC state, since this
 562          * might be someone with a motorized dish controlled by DISEQC.
 563          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 564         if (fepriv->state & FESTATE_DISEQC) {
 565                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 566                 return;
 567         }
 568
 569         /* if we're in the RETUNE state, set everything up for a brand
 570          * new scan, keeping the current inversion setting, as the next
 571          * tune is _very_ likely to require the same */
 572         if (fepriv->state & FESTATE_RETUNE) {
 573                 fepriv->lnb_drift = 0;
 574                 fepriv->auto_step = 0;
 575                 fepriv->auto_sub_step = 0;
 576                 fepriv->started_auto_step = 0;
 577                 fepriv->check_wrapped = 0;
 578         }
 579
 580         /* fast zigzag. */
 581         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 582                 fepriv->delay = fepriv->min_delay;
 583
 584                 /* perform a tune */
 585                 retval = dvb_frontend_swzigzag_autotune(fe,
 586                                                         fepriv->check_wrapped);
 587                 if (retval < 0) {
 588                         return;
 589                 } else if (retval) {
 590                         /* OK, if we've run out of trials at the fast speed.
 591                          * Drop back to slow for the _next_ attempt */
 592                         fepriv->state = FESTATE_SEARCHING_SLOW;
 593                         fepriv->started_auto_step = fepriv->auto_step;
 594                         return;
 595                 }
 596                 fepriv->check_wrapped = 1;
 597
 598                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 599                  * This ensures we cannot return from an
 600                  * FE_SET_FRONTEND ioctl before the first frontend tune
 601                  * occurs */
 602                 if (fepriv->state & FESTATE_RETUNE) {
 603                         fepriv->state = FESTATE_TUNING_FAST;
 604                 }
 605         }
 606
 607         /* slow zigzag */
 608         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 609                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 610
 611                 /* Note: don't bother checking for wrapping; we stay in this
 612                  * state until we get a lock */
 613                 dvb_frontend_swzigzag_autotune(fe, 0);
 614         }
 615 }
 616
 617 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 618 {
 619         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 620
 621         if (fe->exit != DVB_FE_NO_EXIT)
 622                 return 1;
 623
 624         if (fepriv->dvbdev->writers == 1)
 625                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 626                                   dvb_shutdown_timeout * HZ))
 627                         return 1;
 628
 629         return 0;
 630 }
 631
 632 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 633 {
 634         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 635
 636         if (fepriv->wakeup) {
 637                 fepriv->wakeup = 0;
 638                 return 1;
 639         }
 640         return dvb_frontend_is_exiting(fe);
 641 }
 642
 643 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 644 {
 645         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 646
 647         fepriv->wakeup = 1;
 648         wake_up_interruptible(&fepriv->wait_queue);
 649 }
 650
 651 static int dvb_frontend_thread(void *data)
 652 {
 653         struct dvb_frontend *fe = data;
 654         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 655         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 656         enum fe_status s = FE_NONE;
 657         enum dvbfe_algo algo;
 658         bool re_tune = false;
 659         bool semheld = false;
 660
 661         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 662
 663         fepriv->check_wrapped = 0;
 664         fepriv->quality = 0;
 665         fepriv->delay = 3*HZ;
 666         fepriv->status = 0;
 667         fepriv->wakeup = 0;
 668         fepriv->reinitialise = 0;
 669
 670         dvb_frontend_init(fe);
 671
 672         set_freezable();
 673         while (1) {
 674                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 675 restart:
 676                 wait_event_interruptible_timeout(fepriv->wait_queue,
 677                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
 678                                 || freezing(current),
 679                         fepriv->delay);
 680
 681                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 682                         /* got signal or quitting */
 683                         if (!down_interruptible(&fepriv->sem))
 684                                 semheld = true;
 685                         fe->exit = DVB_FE_NORMAL_EXIT;
 686                         break;
 687                 }
 688
 689                 if (try_to_freeze())
 690                         goto restart;
 691
 692                 if (down_interruptible(&fepriv->sem))
 693                         break;
 694
 695                 if (fepriv->reinitialise) {
 696                         dvb_frontend_init(fe);
 697                         if (fe->ops.set_tone && fepriv->tone != -1)
 698                                 fe->ops.set_tone(fe, fepriv->tone);
 699                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 700                                 fe->ops.set_voltage(fe, fepriv->voltage);
 701                         fepriv->reinitialise = 0;
 702                 }
 703
 704                 /* do an iteration of the tuning loop */
 705                 if (fe->ops.get_frontend_algo) {
 706                         algo = fe->ops.get_frontend_algo(fe);
 707                         switch (algo) {
 708                         case DVBFE_ALGO_HW:
 709                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 710
 711                                 if (fepriv->state & FESTATE_RETUNE) {
 712                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 713                                         re_tune = true;
 714                                         fepriv->state = FESTATE_TUNED;
 715                                 } else {
 716                                         re_tune = false;
 717                                 }
 718
 719                                 if (fe->ops.tune)
 720                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 721
 722                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 723                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 724                                         dvb_frontend_add_event(fe, s);
 725                                         fepriv->status = s;
 726                                 }
 727                                 break;
 728                         case DVBFE_ALGO_SW:
 729                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 730                                 dvb_frontend_swzigzag(fe);
 731                                 break;
 732                         case DVBFE_ALGO_CUSTOM:
 733                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 734                                 if (fepriv->state & FESTATE_RETUNE) {
 735                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 736                                         fepriv->state = FESTATE_TUNED;
 737                                 }
 738                                 /* Case where we are going to search for a carrier
 739                                  * User asked us to retune again for some reason, possibly
 740                                  * requesting a search with a new set of parameters
 741                                  */
 742                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 743                                         if (fe->ops.search) {
 744                                                 fepriv->algo_status = fe->ops.search(fe);
 745                                                 /* We did do a search as was requested, the flags are
 746                                                  * now unset as well and has the flags wrt to search.
 747                                                  */
 748                                         } else {
 749                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 750                                         }
 751                                 }
 752                                 /* Track the carrier if the search was successful */
 753                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 754                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 755                                         fepriv->delay = HZ / 2;
 756                                 }
 757                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 758                                 fe->ops.read_status(fe, &s);
 759                                 if (s != fepriv->status) {
 760                                         dvb_frontend_add_event(fe, s); /* update event list */
 761                                         fepriv->status = s;
 762                                         if (!(s & FE_HAS_LOCK)) {
 763                                                 fepriv->delay = HZ / 10;
 764                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 765                                         } else {
 766                                                 fepriv->delay = 60 * HZ;
 767                                         }
 768                                 }
 769                                 break;
 770                         default:
 771                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 772                                 break;
 773                         }
 774                 } else {
 775                         dvb_frontend_swzigzag(fe);
 776                 }
 777         }
 778
 779         if (dvb_powerdown_on_sleep) {
 780                 if (fe->ops.set_voltage)
 781                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 782                 if (fe->ops.tuner_ops.sleep) {
 783                         if (fe->ops.i2c_gate_ctrl)
 784                                 fe->ops.i2c_gate_ctrl(fe, 1);
 785                         fe->ops.tuner_ops.sleep(fe);
 786                         if (fe->ops.i2c_gate_ctrl)
 787                                 fe->ops.i2c_gate_ctrl(fe, 0);
 788                 }
 789                 if (fe->ops.sleep)
 790                         fe->ops.sleep(fe);
 791         }
 792
 793         fepriv->thread = NULL;
 794         if (kthread_should_stop())
 795                 fe->exit = DVB_FE_DEVICE_REMOVED;
 796         else
 797                 fe->exit = DVB_FE_NO_EXIT;
 798         mb();
 799
 800         if (semheld)
 801                 up(&fepriv->sem);
 802         dvb_frontend_wakeup(fe);
 803         return 0;
 804 }
 805
 806 static void dvb_frontend_stop(struct dvb_frontend *fe)
 807 {
 808         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 809
 810         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 811
 812         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 813                 fe->exit = DVB_FE_NORMAL_EXIT;
 814         mb();
 815
 816         if (!fepriv->thread)
 817                 return;
 818
 819         kthread_stop(fepriv->thread);
 820
 821         sema_init(&fepriv->sem, 1);
 822         fepriv->state = FESTATE_IDLE;
 823
 824         /* paranoia check in case a signal arrived */
 825         if (fepriv->thread)
 826                 dev_warn(fe->dvb->device,
 827                                 "dvb_frontend_stop: warning: thread %p won't exit\n",
 828                                 fepriv->thread);
 829 }
 830
 831 /*
 832  * Sleep for the amount of time given by add_usec parameter
 833  *
 834  * This needs to be as precise as possible, as it affects the detection of
 835  * the dish tone command at the satellite subsystem. The precision is improved
 836  * by using a scheduled msleep followed by udelay for the remainder.
 837  */
 838 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 839 {
 840         s32 delta;
 841
 842         *waketime = ktime_add_us(*waketime, add_usec);
 843         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 844         if (delta > 2500) {
 845                 msleep((delta - 1500) / 1000);
 846                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 847         }
 848         if (delta > 0)
 849                 udelay(delta);
 850 }
 851 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 852
 853 static int dvb_frontend_start(struct dvb_frontend *fe)
 854 {
 855         int ret;
 856         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 857         struct task_struct *fe_thread;
 858
 859         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 860
 861         if (fepriv->thread) {
 862                 if (fe->exit == DVB_FE_NO_EXIT)
 863                         return 0;
 864                 else
 865                         dvb_frontend_stop (fe);
 866         }
 867
 868         if (signal_pending(current))
 869                 return -EINTR;
 870         if (down_interruptible (&fepriv->sem))
 871                 return -EINTR;
 872
 873         fepriv->state = FESTATE_IDLE;
 874         fe->exit = DVB_FE_NO_EXIT;
 875         fepriv->thread = NULL;
 876         mb();
 877
 878         fe_thread = kthread_run(dvb_frontend_thread, fe,
 879                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
 880         if (IS_ERR(fe_thread)) {
 881                 ret = PTR_ERR(fe_thread);
 882                 dev_warn(fe->dvb->device,
 883                                 "dvb_frontend_start: failed to start kthread (%d)\n",
 884                                 ret);
 885                 up(&fepriv->sem);
 886                 return ret;
 887         }
 888         fepriv->thread = fe_thread;
 889         return 0;
 890 }
 891
 892 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 893                                         u32 *freq_min, u32 *freq_max)
 894 {
 895         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 896
 897         if (fe->ops.info.frequency_max == 0)
 898                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 899         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 900                 *freq_max = fe->ops.info.frequency_max;
 901         else
 902                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 903
 904         if (*freq_min == 0 || *freq_max == 0)
 905                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 906                                 fe->dvb->num, fe->id);
 907 }
 908
 909 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 910 {
 911         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 912         u32 freq_min;
 913         u32 freq_max;
 914
 915         /* range check: frequency */
 916         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max);
 917         if ((freq_min && c->frequency < freq_min) ||
 918             (freq_max && c->frequency > freq_max)) {
 919                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 920                                 fe->dvb->num, fe->id, c->frequency,
 921                                 freq_min, freq_max);
 922                 return -EINVAL;
 923         }
 924
 925         /* range check: symbol rate */
 926         switch (c->delivery_system) {
 927         case SYS_DVBS:
 928         case SYS_DVBS2:
 929         case SYS_TURBO:
 930         case SYS_DVBC_ANNEX_A:
 931         case SYS_DVBC_ANNEX_C:
 932                 if ((fe->ops.info.symbol_rate_min &&
 933                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 934                     (fe->ops.info.symbol_rate_max &&
 935                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 936                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 937                                         fe->dvb->num, fe->id, c->symbol_rate,
 938                                         fe->ops.info.symbol_rate_min,
 939                                         fe->ops.info.symbol_rate_max);
 940                         return -EINVAL;
 941                 }
 942         default:
 943                 break;
 944         }
 945
 946         return 0;
 947 }
 948
 949 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 950 {
 951         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 952         int i;
 953         u32 delsys;
 954
 955         delsys = c->delivery_system;
 956         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
 957         c->delivery_system = delsys;
 958
 959         c->state = DTV_CLEAR;
 960
 961         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
 962                         __func__, c->delivery_system);
 963
 964         c->transmission_mode = TRANSMISSION_MODE_AUTO;
 965         c->bandwidth_hz = 0;    /* AUTO */
 966         c->guard_interval = GUARD_INTERVAL_AUTO;
 967         c->hierarchy = HIERARCHY_AUTO;
 968         c->symbol_rate = 0;
 969         c->code_rate_HP = FEC_AUTO;
 970         c->code_rate_LP = FEC_AUTO;
 971         c->fec_inner = FEC_AUTO;
 972         c->rolloff = ROLLOFF_AUTO;
 973         c->voltage = SEC_VOLTAGE_OFF;
 974         c->sectone = SEC_TONE_OFF;
 975         c->pilot = PILOT_AUTO;
 976
 977         c->isdbt_partial_reception = 0;
 978         c->isdbt_sb_mode = 0;
 979         c->isdbt_sb_subchannel = 0;
 980         c->isdbt_sb_segment_idx = 0;
 981         c->isdbt_sb_segment_count = 0;
 982         c->isdbt_layer_enabled = 0;
 983         for (i = 0; i < 3; i++) {
 984                 c->layer[i].fec = FEC_AUTO;
 985                 c->layer[i].modulation = QAM_AUTO;
 986                 c->layer[i].interleaving = 0;
 987                 c->layer[i].segment_count = 0;
 988         }
 989
 990         c->stream_id = NO_STREAM_ID_FILTER;
 991
 992         switch (c->delivery_system) {
 993         case SYS_DVBS:
 994         case SYS_DVBS2:
 995         case SYS_TURBO:
 996                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
 997                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
 998                 break;
 999         case SYS_ATSC:
1000                 c->modulation = VSB_8;
1001                 break;
1002         case SYS_ISDBS:
1003                 c->symbol_rate = 28860000;
1004                 c->rolloff = ROLLOFF_35;
1005                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1006                 break;
1007         default:
1008                 c->modulation = QAM_AUTO;
1009                 break;
1010         }
1011
1012         c->lna = LNA_AUTO;
1013
1014         return 0;
1015 }
1016
1017 #define _DTV_CMD(n, s, b) \
1018 [n] = { \
1019         .name = #n, \
1020         .cmd  = n, \
1021         .set  = s,\
1022         .buffer = b \
1023 }
1024
1025 struct dtv_cmds_h {
1026         char    *name;          /* A display name for debugging purposes */
1027
1028         __u32   cmd;            /* A unique ID */
1029
1030         /* Flags */
1031         __u32   set:1;          /* Either a set or get property */
1032         __u32   buffer:1;       /* Does this property use the buffer? */
1033         __u32   reserved:30;    /* Align */
1034 };
1035
1036 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1037         _DTV_CMD(DTV_TUNE, 1, 0),
1038         _DTV_CMD(DTV_CLEAR, 1, 0),
1039
1040         /* Set */
1041         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1042         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1043         _DTV_CMD(DTV_MODULATION, 1, 0),
1044         _DTV_CMD(DTV_INVERSION, 1, 0),
1045         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1046         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1047         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1048         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1049         _DTV_CMD(DTV_TONE, 1, 0),
1050         _DTV_CMD(DTV_PILOT, 1, 0),
1051         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1052         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1053         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1054         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1055         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1056         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1057         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1058         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1059
1060         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1061         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1062         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1063         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1064         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1065         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1066         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1067         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1068         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1069         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1070         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1071         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1072         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1073         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1074         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1075         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1076         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1077         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1078
1079         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1080         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1081         _DTV_CMD(DTV_LNA, 1, 0),
1082
1083         /* Get */
1084         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1085         _DTV_CMD(DTV_API_VERSION, 0, 0),
1086
1087         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1088
1089         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1090         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1091
1092         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1093         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1094         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1095         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1096         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1097         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1098         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1099         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1100         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1101         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1102         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1103         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1104         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1105
1106         /* Statistics API */
1107         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1108         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1109         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1110         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1111         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1112         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1113         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1114         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1115 };
1116
1117 static void dtv_property_dump(struct dvb_frontend *fe,
1118                               bool is_set,
1119                               struct dtv_property *tvp)
1120 {
1121         int i;
1122
1123         if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) {
1124                 dev_warn(fe->dvb->device, "%s: %s tvp.cmd = 0x%08x undefined\n",
1125                                 __func__,
1126                                 is_set ? "SET" : "GET",
1127                                 tvp->cmd);
1128                 return;
1129         }
1130
1131         dev_dbg(fe->dvb->device, "%s: %s tvp.cmd    = 0x%08x (%s)\n", __func__,
1132                 is_set ? "SET" : "GET",
1133                 tvp->cmd,
1134                 dtv_cmds[tvp->cmd].name);
1135
1136         if (dtv_cmds[tvp->cmd].buffer) {
1137                 dev_dbg(fe->dvb->device, "%s: tvp.u.buffer.len = 0x%02x\n",
1138                         __func__, tvp->u.buffer.len);
1139
1140                 for(i = 0; i < tvp->u.buffer.len; i++)
1141                         dev_dbg(fe->dvb->device,
1142                                         "%s: tvp.u.buffer.data[0x%02x] = 0x%02x\n",
1143                                         __func__, i, tvp->u.buffer.data[i]);
1144         } else {
1145                 dev_dbg(fe->dvb->device, "%s: tvp.u.data = 0x%08x\n", __func__,
1146                                 tvp->u.data);
1147         }
1148 }
1149
1150 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1151  * drivers can use a single set_frontend tuning function, regardless of whether
1152  * it's being used for the legacy or new API, reducing code and complexity.
1153  */
1154 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1155                                    struct dtv_frontend_properties *c,
1156                                    const struct dvb_frontend_parameters *p)
1157 {
1158         c->frequency = p->frequency;
1159         c->inversion = p->inversion;
1160
1161         switch (dvbv3_type(c->delivery_system)) {
1162         case DVBV3_QPSK:
1163                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1164                 c->symbol_rate = p->u.qpsk.symbol_rate;
1165                 c->fec_inner = p->u.qpsk.fec_inner;
1166                 break;
1167         case DVBV3_QAM:
1168                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1169                 c->symbol_rate = p->u.qam.symbol_rate;
1170                 c->fec_inner = p->u.qam.fec_inner;
1171                 c->modulation = p->u.qam.modulation;
1172                 break;
1173         case DVBV3_OFDM:
1174                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1175
1176                 switch (p->u.ofdm.bandwidth) {
1177                 case BANDWIDTH_10_MHZ:
1178                         c->bandwidth_hz = 10000000;
1179                         break;
1180                 case BANDWIDTH_8_MHZ:
1181                         c->bandwidth_hz = 8000000;
1182                         break;
1183                 case BANDWIDTH_7_MHZ:
1184                         c->bandwidth_hz = 7000000;
1185                         break;
1186                 case BANDWIDTH_6_MHZ:
1187                         c->bandwidth_hz = 6000000;
1188                         break;
1189                 case BANDWIDTH_5_MHZ:
1190                         c->bandwidth_hz = 5000000;
1191                         break;
1192                 case BANDWIDTH_1_712_MHZ:
1193                         c->bandwidth_hz = 1712000;
1194                         break;
1195                 case BANDWIDTH_AUTO:
1196                         c->bandwidth_hz = 0;
1197                 }
1198
1199                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1200                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1201                 c->modulation = p->u.ofdm.constellation;
1202                 c->transmission_mode = p->u.ofdm.transmission_mode;
1203                 c->guard_interval = p->u.ofdm.guard_interval;
1204                 c->hierarchy = p->u.ofdm.hierarchy_information;
1205                 break;
1206         case DVBV3_ATSC:
1207                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1208                 c->modulation = p->u.vsb.modulation;
1209                 if (c->delivery_system == SYS_ATSCMH)
1210                         break;
1211                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1212                         c->delivery_system = SYS_ATSC;
1213                 else
1214                         c->delivery_system = SYS_DVBC_ANNEX_B;
1215                 break;
1216         case DVBV3_UNKNOWN:
1217                 dev_err(fe->dvb->device,
1218                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1219                                 __func__, c->delivery_system);
1220                 return -EINVAL;
1221         }
1222
1223         return 0;
1224 }
1225
1226 /* Ensure the cached values are set correctly in the frontend
1227  * legacy tuning structures, for the advanced tuning API.
1228  */
1229 static int
1230 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1231                                 const struct dtv_frontend_properties *c,
1232                                 struct dvb_frontend_parameters *p)
1233 {
1234         p->frequency = c->frequency;
1235         p->inversion = c->inversion;
1236
1237         switch (dvbv3_type(c->delivery_system)) {
1238         case DVBV3_UNKNOWN:
1239                 dev_err(fe->dvb->device,
1240                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1241                                 __func__, c->delivery_system);
1242                 return -EINVAL;
1243         case DVBV3_QPSK:
1244                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1245                 p->u.qpsk.symbol_rate = c->symbol_rate;
1246                 p->u.qpsk.fec_inner = c->fec_inner;
1247                 break;
1248         case DVBV3_QAM:
1249                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1250                 p->u.qam.symbol_rate = c->symbol_rate;
1251                 p->u.qam.fec_inner = c->fec_inner;
1252                 p->u.qam.modulation = c->modulation;
1253                 break;
1254         case DVBV3_OFDM:
1255                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1256                 switch (c->bandwidth_hz) {
1257                 case 10000000:
1258                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1259                         break;
1260                 case 8000000:
1261                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1262                         break;
1263                 case 7000000:
1264                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1265                         break;
1266                 case 6000000:
1267                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1268                         break;
1269                 case 5000000:
1270                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1271                         break;
1272                 case 1712000:
1273                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1274                         break;
1275                 case 0:
1276                 default:
1277                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1278                 }
1279                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1280                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1281                 p->u.ofdm.constellation = c->modulation;
1282                 p->u.ofdm.transmission_mode = c->transmission_mode;
1283                 p->u.ofdm.guard_interval = c->guard_interval;
1284                 p->u.ofdm.hierarchy_information = c->hierarchy;
1285                 break;
1286         case DVBV3_ATSC:
1287                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1288                 p->u.vsb.modulation = c->modulation;
1289                 break;
1290         }
1291         return 0;
1292 }
1293
1294 /**
1295  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1296  * @fe:         struct dvb_frontend pointer
1297  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1298  * @p_out       struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1299  *
1300  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1301  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1302  * If p_out is not null, it will update the DVBv3 params pointed by it.
1303  */
1304 static int dtv_get_frontend(struct dvb_frontend *fe,
1305                             struct dtv_frontend_properties *c,
1306                             struct dvb_frontend_parameters *p_out)
1307 {
1308         int r;
1309
1310         if (fe->ops.get_frontend) {
1311                 r = fe->ops.get_frontend(fe, c);
1312                 if (unlikely(r < 0))
1313                         return r;
1314                 if (p_out)
1315                         dtv_property_legacy_params_sync(fe, c, p_out);
1316                 return 0;
1317         }
1318
1319         /* As everything is in cache, get_frontend fops are always supported */
1320         return 0;
1321 }
1322
1323 static int dvb_frontend_ioctl_legacy(struct file *file,
1324                         unsigned int cmd, void *parg);
1325 static int dvb_frontend_ioctl_properties(struct file *file,
1326                         unsigned int cmd, void *parg);
1327
1328 static int dtv_property_process_get(struct dvb_frontend *fe,
1329                                     const struct dtv_frontend_properties *c,
1330                                     struct dtv_property *tvp,
1331                                     struct file *file)
1332 {
1333         int r, ncaps;
1334
1335         switch(tvp->cmd) {
1336         case DTV_ENUM_DELSYS:
1337                 ncaps = 0;
1338                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1339                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1340                         ncaps++;
1341                 }
1342                 tvp->u.buffer.len = ncaps;
1343                 break;
1344         case DTV_FREQUENCY:
1345                 tvp->u.data = c->frequency;
1346                 break;
1347         case DTV_MODULATION:
1348                 tvp->u.data = c->modulation;
1349                 break;
1350         case DTV_BANDWIDTH_HZ:
1351                 tvp->u.data = c->bandwidth_hz;
1352                 break;
1353         case DTV_INVERSION:
1354                 tvp->u.data = c->inversion;
1355                 break;
1356         case DTV_SYMBOL_RATE:
1357                 tvp->u.data = c->symbol_rate;
1358                 break;
1359         case DTV_INNER_FEC:
1360                 tvp->u.data = c->fec_inner;
1361                 break;
1362         case DTV_PILOT:
1363                 tvp->u.data = c->pilot;
1364                 break;
1365         case DTV_ROLLOFF:
1366                 tvp->u.data = c->rolloff;
1367                 break;
1368         case DTV_DELIVERY_SYSTEM:
1369                 tvp->u.data = c->delivery_system;
1370                 break;
1371         case DTV_VOLTAGE:
1372                 tvp->u.data = c->voltage;
1373                 break;
1374         case DTV_TONE:
1375                 tvp->u.data = c->sectone;
1376                 break;
1377         case DTV_API_VERSION:
1378                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1379                 break;
1380         case DTV_CODE_RATE_HP:
1381                 tvp->u.data = c->code_rate_HP;
1382                 break;
1383         case DTV_CODE_RATE_LP:
1384                 tvp->u.data = c->code_rate_LP;
1385                 break;
1386         case DTV_GUARD_INTERVAL:
1387                 tvp->u.data = c->guard_interval;
1388                 break;
1389         case DTV_TRANSMISSION_MODE:
1390                 tvp->u.data = c->transmission_mode;
1391                 break;
1392         case DTV_HIERARCHY:
1393                 tvp->u.data = c->hierarchy;
1394                 break;
1395         case DTV_INTERLEAVING:
1396                 tvp->u.data = c->interleaving;
1397                 break;
1398
1399         /* ISDB-T Support here */
1400         case DTV_ISDBT_PARTIAL_RECEPTION:
1401                 tvp->u.data = c->isdbt_partial_reception;
1402                 break;
1403         case DTV_ISDBT_SOUND_BROADCASTING:
1404                 tvp->u.data = c->isdbt_sb_mode;
1405                 break;
1406         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1407                 tvp->u.data = c->isdbt_sb_subchannel;
1408                 break;
1409         case DTV_ISDBT_SB_SEGMENT_IDX:
1410                 tvp->u.data = c->isdbt_sb_segment_idx;
1411                 break;
1412         case DTV_ISDBT_SB_SEGMENT_COUNT:
1413                 tvp->u.data = c->isdbt_sb_segment_count;
1414                 break;
1415         case DTV_ISDBT_LAYER_ENABLED:
1416                 tvp->u.data = c->isdbt_layer_enabled;
1417                 break;
1418         case DTV_ISDBT_LAYERA_FEC:
1419                 tvp->u.data = c->layer[0].fec;
1420                 break;
1421         case DTV_ISDBT_LAYERA_MODULATION:
1422                 tvp->u.data = c->layer[0].modulation;
1423                 break;
1424         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1425                 tvp->u.data = c->layer[0].segment_count;
1426                 break;
1427         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1428                 tvp->u.data = c->layer[0].interleaving;
1429                 break;
1430         case DTV_ISDBT_LAYERB_FEC:
1431                 tvp->u.data = c->layer[1].fec;
1432                 break;
1433         case DTV_ISDBT_LAYERB_MODULATION:
1434                 tvp->u.data = c->layer[1].modulation;
1435                 break;
1436         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1437                 tvp->u.data = c->layer[1].segment_count;
1438                 break;
1439         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1440                 tvp->u.data = c->layer[1].interleaving;
1441                 break;
1442         case DTV_ISDBT_LAYERC_FEC:
1443                 tvp->u.data = c->layer[2].fec;
1444                 break;
1445         case DTV_ISDBT_LAYERC_MODULATION:
1446                 tvp->u.data = c->layer[2].modulation;
1447                 break;
1448         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1449                 tvp->u.data = c->layer[2].segment_count;
1450                 break;
1451         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1452                 tvp->u.data = c->layer[2].interleaving;
1453                 break;
1454
1455         /* Multistream support */
1456         case DTV_STREAM_ID:
1457         case DTV_DVBT2_PLP_ID_LEGACY:
1458                 tvp->u.data = c->stream_id;
1459                 break;
1460
1461         /* ATSC-MH */
1462         case DTV_ATSCMH_FIC_VER:
1463                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1464                 break;
1465         case DTV_ATSCMH_PARADE_ID:
1466                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1467                 break;
1468         case DTV_ATSCMH_NOG:
1469                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1470                 break;
1471         case DTV_ATSCMH_TNOG:
1472                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1473                 break;
1474         case DTV_ATSCMH_SGN:
1475                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1476                 break;
1477         case DTV_ATSCMH_PRC:
1478                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1479                 break;
1480         case DTV_ATSCMH_RS_FRAME_MODE:
1481                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1482                 break;
1483         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1484                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1485                 break;
1486         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1487                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1488                 break;
1489         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1490                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1491                 break;
1492         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1493                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1494                 break;
1495         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1496                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1497                 break;
1498         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1499                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1500                 break;
1501         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1502                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1503                 break;
1504         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1505                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1506                 break;
1507
1508         case DTV_LNA:
1509                 tvp->u.data = c->lna;
1510                 break;
1511
1512         /* Fill quality measures */
1513         case DTV_STAT_SIGNAL_STRENGTH:
1514                 tvp->u.st = c->strength;
1515                 break;
1516         case DTV_STAT_CNR:
1517                 tvp->u.st = c->cnr;
1518                 break;
1519         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1520                 tvp->u.st = c->pre_bit_error;
1521                 break;
1522         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1523                 tvp->u.st = c->pre_bit_count;
1524                 break;
1525         case DTV_STAT_POST_ERROR_BIT_COUNT:
1526                 tvp->u.st = c->post_bit_error;
1527                 break;
1528         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1529                 tvp->u.st = c->post_bit_count;
1530                 break;
1531         case DTV_STAT_ERROR_BLOCK_COUNT:
1532                 tvp->u.st = c->block_error;
1533                 break;
1534         case DTV_STAT_TOTAL_BLOCK_COUNT:
1535                 tvp->u.st = c->block_count;
1536                 break;
1537         default:
1538                 dev_dbg(fe->dvb->device,
1539                         "%s: FE property %d doesn't exist\n",
1540                         __func__, tvp->cmd);
1541                 return -EINVAL;
1542         }
1543
1544         /* Allow the frontend to override outgoing properties */
1545         if (fe->ops.get_property) {
1546                 r = fe->ops.get_property(fe, tvp);
1547                 if (r < 0)
1548                         return r;
1549         }
1550
1551         dtv_property_dump(fe, false, tvp);
1552
1553         return 0;
1554 }
1555
1556 static int dtv_set_frontend(struct dvb_frontend *fe);
1557
1558 static bool is_dvbv3_delsys(u32 delsys)
1559 {
1560         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1561                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1562 }
1563
1564 /**
1565  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1566  * @fe:                 struct frontend;
1567  * @delsys:                     DVBv5 type that will be used for emulation
1568  *
1569  * Provides emulation for delivery systems that are compatible with the old
1570  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1571  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1572  * parameters are compatible with DVB-S spec.
1573  */
1574 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1575 {
1576         int i;
1577         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1578
1579         c->delivery_system = delsys;
1580
1581         /*
1582          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1583          */
1584         if (c->delivery_system == SYS_ISDBT) {
1585                 dev_dbg(fe->dvb->device,
1586                         "%s: Using defaults for SYS_ISDBT\n",
1587                         __func__);
1588
1589                 if (!c->bandwidth_hz)
1590                         c->bandwidth_hz = 6000000;
1591
1592                 c->isdbt_partial_reception = 0;
1593                 c->isdbt_sb_mode = 0;
1594                 c->isdbt_sb_subchannel = 0;
1595                 c->isdbt_sb_segment_idx = 0;
1596                 c->isdbt_sb_segment_count = 0;
1597                 c->isdbt_layer_enabled = 7;
1598                 for (i = 0; i < 3; i++) {
1599                         c->layer[i].fec = FEC_AUTO;
1600                         c->layer[i].modulation = QAM_AUTO;
1601                         c->layer[i].interleaving = 0;
1602                         c->layer[i].segment_count = 0;
1603                 }
1604         }
1605         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1606                 __func__, c->delivery_system);
1607
1608         return 0;
1609 }
1610
1611 /**
1612  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1613  * @fe:                 frontend struct
1614  * @desired_system:     delivery system requested by the user
1615  *
1616  * A DVBv5 call know what's the desired system it wants. So, set it.
1617  *
1618  * There are, however, a few known issues with early DVBv5 applications that
1619  * are also handled by this logic:
1620  *
1621  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1622  *    This is an API violation, but, as we don't want to break userspace,
1623  *    convert it to the first supported delivery system.
1624  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1625  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1626  *    ISDB-T provided backward compat with DVB-T.
1627  */
1628 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1629                                      u32 desired_system)
1630 {
1631         int ncaps;
1632         u32 delsys = SYS_UNDEFINED;
1633         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1634         enum dvbv3_emulation_type type;
1635
1636         /*
1637          * It was reported that some old DVBv5 applications were
1638          * filling delivery_system with SYS_UNDEFINED. If this happens,
1639          * assume that the application wants to use the first supported
1640          * delivery system.
1641          */
1642         if (desired_system == SYS_UNDEFINED)
1643                 desired_system = fe->ops.delsys[0];
1644
1645         /*
1646          * This is a DVBv5 call. So, it likely knows the supported
1647          * delivery systems. So, check if the desired delivery system is
1648          * supported
1649          */
1650         ncaps = 0;
1651         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1652                 if (fe->ops.delsys[ncaps] == desired_system) {
1653                         c->delivery_system = desired_system;
1654                         dev_dbg(fe->dvb->device,
1655                                         "%s: Changing delivery system to %d\n",
1656                                         __func__, desired_system);
1657                         return 0;
1658                 }
1659                 ncaps++;
1660         }
1661
1662         /*
1663          * The requested delivery system isn't supported. Maybe userspace
1664          * is requesting a DVBv3 compatible delivery system.
1665          *
1666          * The emulation only works if the desired system is one of the
1667          * delivery systems supported by DVBv3 API
1668          */
1669         if (!is_dvbv3_delsys(desired_system)) {
1670                 dev_dbg(fe->dvb->device,
1671                         "%s: Delivery system %d not supported.\n",
1672                         __func__, desired_system);
1673                 return -EINVAL;
1674         }
1675
1676         type = dvbv3_type(desired_system);
1677
1678         /*
1679         * Get the last non-DVBv3 delivery system that has the same type
1680         * of the desired system
1681         */
1682         ncaps = 0;
1683         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1684                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1685                         delsys = fe->ops.delsys[ncaps];
1686                 ncaps++;
1687         }
1688
1689         /* There's nothing compatible with the desired delivery system */
1690         if (delsys == SYS_UNDEFINED) {
1691                 dev_dbg(fe->dvb->device,
1692                         "%s: Delivery system %d not supported on emulation mode.\n",
1693                         __func__, desired_system);
1694                 return -EINVAL;
1695         }
1696
1697         dev_dbg(fe->dvb->device,
1698                 "%s: Using delivery system %d emulated as if it were %d\n",
1699                 __func__, delsys, desired_system);
1700
1701         return emulate_delivery_system(fe, desired_system);
1702 }
1703
1704 /**
1705  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1706  * @fe: frontend struct
1707  *
1708  * A DVBv3 call doesn't know what's the desired system it wants. It also
1709  * doesn't allow to switch between different types. Due to that, userspace
1710  * should use DVBv5 instead.
1711  * However, in order to avoid breaking userspace API, limited backward
1712  * compatibility support is provided.
1713  *
1714  * There are some delivery systems that are incompatible with DVBv3 calls.
1715  *
1716  * This routine should work fine for frontends that support just one delivery
1717  * system.
1718  *
1719  * For frontends that support multiple frontends:
1720  * 1) It defaults to use the first supported delivery system. There's an
1721  *    userspace application that allows changing it at runtime;
1722  *
1723  * 2) If the current delivery system is not compatible with DVBv3, it gets
1724  *    the first one that it is compatible.
1725  *
1726  * NOTE: in order for this to work with applications like Kaffeine that
1727  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1728  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1729  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1730  *      to DVB-S.
1731  */
1732 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1733 {
1734         int ncaps;
1735         u32 delsys = SYS_UNDEFINED;
1736         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1737
1738         /* If not set yet, defaults to the first supported delivery system */
1739         if (c->delivery_system == SYS_UNDEFINED)
1740                 c->delivery_system = fe->ops.delsys[0];
1741
1742         /*
1743          * Trivial case: just use the current one, if it already a DVBv3
1744          * delivery system
1745          */
1746         if (is_dvbv3_delsys(c->delivery_system)) {
1747                 dev_dbg(fe->dvb->device,
1748                                 "%s: Using delivery system to %d\n",
1749                                 __func__, c->delivery_system);
1750                 return 0;
1751         }
1752
1753         /*
1754          * Seek for the first delivery system that it is compatible with a
1755          * DVBv3 standard
1756          */
1757         ncaps = 0;
1758         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1759                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1760                         delsys = fe->ops.delsys[ncaps];
1761                         break;
1762                 }
1763                 ncaps++;
1764         }
1765         if (delsys == SYS_UNDEFINED) {
1766                 dev_dbg(fe->dvb->device,
1767                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1768                         __func__);
1769                 return -EINVAL;
1770         }
1771         return emulate_delivery_system(fe, delsys);
1772 }
1773
1774 static int dtv_property_process_set(struct dvb_frontend *fe,
1775                                     struct dtv_property *tvp,
1776                                     struct file *file)
1777 {
1778         int r = 0;
1779         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1780
1781         /* Allow the frontend to validate incoming properties */
1782         if (fe->ops.set_property) {
1783                 r = fe->ops.set_property(fe, tvp);
1784                 if (r < 0)
1785                         return r;
1786         }
1787
1788         dtv_property_dump(fe, true, tvp);
1789
1790         switch(tvp->cmd) {
1791         case DTV_CLEAR:
1792                 /*
1793                  * Reset a cache of data specific to the frontend here. This does
1794                  * not effect hardware.
1795                  */
1796                 dvb_frontend_clear_cache(fe);
1797                 break;
1798         case DTV_TUNE:
1799                 /* interpret the cache of data, build either a traditional frontend
1800                  * tunerequest so we can pass validation in the FE_SET_FRONTEND
1801                  * ioctl.
1802                  */
1803                 c->state = tvp->cmd;
1804                 dev_dbg(fe->dvb->device, "%s: Finalised property cache\n",
1805                                 __func__);
1806
1807                 r = dtv_set_frontend(fe);
1808                 break;
1809         case DTV_FREQUENCY:
1810                 c->frequency = tvp->u.data;
1811                 break;
1812         case DTV_MODULATION:
1813                 c->modulation = tvp->u.data;
1814                 break;
1815         case DTV_BANDWIDTH_HZ:
1816                 c->bandwidth_hz = tvp->u.data;
1817                 break;
1818         case DTV_INVERSION:
1819                 c->inversion = tvp->u.data;
1820                 break;
1821         case DTV_SYMBOL_RATE:
1822                 c->symbol_rate = tvp->u.data;
1823                 break;
1824         case DTV_INNER_FEC:
1825                 c->fec_inner = tvp->u.data;
1826                 break;
1827         case DTV_PILOT:
1828                 c->pilot = tvp->u.data;
1829                 break;
1830         case DTV_ROLLOFF:
1831                 c->rolloff = tvp->u.data;
1832                 break;
1833         case DTV_DELIVERY_SYSTEM:
1834                 r = dvbv5_set_delivery_system(fe, tvp->u.data);
1835                 break;
1836         case DTV_VOLTAGE:
1837                 c->voltage = tvp->u.data;
1838                 r = dvb_frontend_ioctl_legacy(file, FE_SET_VOLTAGE,
1839                         (void *)c->voltage);
1840                 break;
1841         case DTV_TONE:
1842                 c->sectone = tvp->u.data;
1843                 r = dvb_frontend_ioctl_legacy(file, FE_SET_TONE,
1844                         (void *)c->sectone);
1845                 break;
1846         case DTV_CODE_RATE_HP:
1847                 c->code_rate_HP = tvp->u.data;
1848                 break;
1849         case DTV_CODE_RATE_LP:
1850                 c->code_rate_LP = tvp->u.data;
1851                 break;
1852         case DTV_GUARD_INTERVAL:
1853                 c->guard_interval = tvp->u.data;
1854                 break;
1855         case DTV_TRANSMISSION_MODE:
1856                 c->transmission_mode = tvp->u.data;
1857                 break;
1858         case DTV_HIERARCHY:
1859                 c->hierarchy = tvp->u.data;
1860                 break;
1861         case DTV_INTERLEAVING:
1862                 c->interleaving = tvp->u.data;
1863                 break;
1864
1865         /* ISDB-T Support here */
1866         case DTV_ISDBT_PARTIAL_RECEPTION:
1867                 c->isdbt_partial_reception = tvp->u.data;
1868                 break;
1869         case DTV_ISDBT_SOUND_BROADCASTING:
1870                 c->isdbt_sb_mode = tvp->u.data;
1871                 break;
1872         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1873                 c->isdbt_sb_subchannel = tvp->u.data;
1874                 break;
1875         case DTV_ISDBT_SB_SEGMENT_IDX:
1876                 c->isdbt_sb_segment_idx = tvp->u.data;
1877                 break;
1878         case DTV_ISDBT_SB_SEGMENT_COUNT:
1879                 c->isdbt_sb_segment_count = tvp->u.data;
1880                 break;
1881         case DTV_ISDBT_LAYER_ENABLED:
1882                 c->isdbt_layer_enabled = tvp->u.data;
1883                 break;
1884         case DTV_ISDBT_LAYERA_FEC:
1885                 c->layer[0].fec = tvp->u.data;
1886                 break;
1887         case DTV_ISDBT_LAYERA_MODULATION:
1888                 c->layer[0].modulation = tvp->u.data;
1889                 break;
1890         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1891                 c->layer[0].segment_count = tvp->u.data;
1892                 break;
1893         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1894                 c->layer[0].interleaving = tvp->u.data;
1895                 break;
1896         case DTV_ISDBT_LAYERB_FEC:
1897                 c->layer[1].fec = tvp->u.data;
1898                 break;
1899         case DTV_ISDBT_LAYERB_MODULATION:
1900                 c->layer[1].modulation = tvp->u.data;
1901                 break;
1902         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1903                 c->layer[1].segment_count = tvp->u.data;
1904                 break;
1905         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1906                 c->layer[1].interleaving = tvp->u.data;
1907                 break;
1908         case DTV_ISDBT_LAYERC_FEC:
1909                 c->layer[2].fec = tvp->u.data;
1910                 break;
1911         case DTV_ISDBT_LAYERC_MODULATION:
1912                 c->layer[2].modulation = tvp->u.data;
1913                 break;
1914         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1915                 c->layer[2].segment_count = tvp->u.data;
1916                 break;
1917         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1918                 c->layer[2].interleaving = tvp->u.data;
1919                 break;
1920
1921         /* Multistream support */
1922         case DTV_STREAM_ID:
1923         case DTV_DVBT2_PLP_ID_LEGACY:
1924                 c->stream_id = tvp->u.data;
1925                 break;
1926
1927         /* ATSC-MH */
1928         case DTV_ATSCMH_PARADE_ID:
1929                 fe->dtv_property_cache.atscmh_parade_id = tvp->u.data;
1930                 break;
1931         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1932                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = tvp->u.data;
1933                 break;
1934
1935         case DTV_LNA:
1936                 c->lna = tvp->u.data;
1937                 if (fe->ops.set_lna)
1938                         r = fe->ops.set_lna(fe);
1939                 if (r < 0)
1940                         c->lna = LNA_AUTO;
1941                 break;
1942
1943         default:
1944                 return -EINVAL;
1945         }
1946
1947         return r;
1948 }
1949
1950 static int dvb_frontend_ioctl(struct file *file,
1951                         unsigned int cmd, void *parg)
1952 {
1953         struct dvb_device *dvbdev = file->private_data;
1954         struct dvb_frontend *fe = dvbdev->priv;
1955         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1956         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1957         int err = -EOPNOTSUPP;
1958
1959         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1960         if (down_interruptible(&fepriv->sem))
1961                 return -ERESTARTSYS;
1962
1963         if (fe->exit != DVB_FE_NO_EXIT) {
1964                 up(&fepriv->sem);
1965                 return -ENODEV;
1966         }
1967
1968         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
1969             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
1970              cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
1971                 up(&fepriv->sem);
1972                 return -EPERM;
1973         }
1974
1975         if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
1976                 err = dvb_frontend_ioctl_properties(file, cmd, parg);
1977         else {
1978                 c->state = DTV_UNDEFINED;
1979                 err = dvb_frontend_ioctl_legacy(file, cmd, parg);
1980         }
1981
1982         up(&fepriv->sem);
1983         return err;
1984 }
1985
1986 static int dvb_frontend_ioctl_properties(struct file *file,
1987                         unsigned int cmd, void *parg)
1988 {
1989         struct dvb_device *dvbdev = file->private_data;
1990         struct dvb_frontend *fe = dvbdev->priv;
1991         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1992         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1993         int err = 0;
1994
1995         struct dtv_properties *tvps = parg;
1996         struct dtv_property *tvp = NULL;
1997         int i;
1998
1999         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2000
2001         if (cmd == FE_SET_PROPERTY) {
2002                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2003                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2004
2005                 /* Put an arbitrary limit on the number of messages that can
2006                  * be sent at once */
2007                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2008                         return -EINVAL;
2009
2010                 tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
2011                 if (IS_ERR(tvp))
2012                         return PTR_ERR(tvp);
2013
2014                 for (i = 0; i < tvps->num; i++) {
2015                         err = dtv_property_process_set(fe, tvp + i, file);
2016                         if (err < 0)
2017                                 goto out;
2018                         (tvp + i)->result = err;
2019                 }
2020
2021                 if (c->state == DTV_TUNE)
2022                         dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
2023
2024         } else if (cmd == FE_GET_PROPERTY) {
2025                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2026
2027                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2028                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2029
2030                 /* Put an arbitrary limit on the number of messages that can
2031                  * be sent at once */
2032                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2033                         return -EINVAL;
2034
2035                 tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
2036                 if (IS_ERR(tvp))
2037                         return PTR_ERR(tvp);
2038
2039                 /*
2040                  * Let's use our own copy of property cache, in order to
2041                  * avoid mangling with DTV zigzag logic, as drivers might
2042                  * return crap, if they don't check if the data is available
2043                  * before updating the properties cache.
2044                  */
2045                 if (fepriv->state != FESTATE_IDLE) {
2046                         err = dtv_get_frontend(fe, &getp, NULL);
2047                         if (err < 0)
2048                                 goto out;
2049                 }
2050                 for (i = 0; i < tvps->num; i++) {
2051                         err = dtv_property_process_get(fe, &getp, tvp + i, file);
2052                         if (err < 0)
2053                                 goto out;
2054                         (tvp + i)->result = err;
2055                 }
2056
2057                 if (copy_to_user((void __user *)tvps->props, tvp,
2058                                  tvps->num * sizeof(struct dtv_property))) {
2059                         err = -EFAULT;
2060                         goto out;
2061                 }
2062
2063         } else
2064                 err = -EOPNOTSUPP;
2065
2066 out:
2067         kfree(tvp);
2068         return err;
2069 }
2070
2071 static int dtv_set_frontend(struct dvb_frontend *fe)
2072 {
2073         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2074         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2075         struct dvb_frontend_tune_settings fetunesettings;
2076         u32 rolloff = 0;
2077
2078         if (dvb_frontend_check_parameters(fe) < 0)
2079                 return -EINVAL;
2080
2081         /*
2082          * Initialize output parameters to match the values given by
2083          * the user. FE_SET_FRONTEND triggers an initial frontend event
2084          * with status = 0, which copies output parameters to userspace.
2085          */
2086         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2087
2088         /*
2089          * Be sure that the bandwidth will be filled for all
2090          * non-satellite systems, as tuners need to know what
2091          * low pass/Nyquist half filter should be applied, in
2092          * order to avoid inter-channel noise.
2093          *
2094          * ISDB-T and DVB-T/T2 already sets bandwidth.
2095          * ATSC and DVB-C don't set, so, the core should fill it.
2096          *
2097          * On DVB-C Annex A and C, the bandwidth is a function of
2098          * the roll-off and symbol rate. Annex B defines different
2099          * roll-off factors depending on the modulation. Fortunately,
2100          * Annex B is only used with 6MHz, so there's no need to
2101          * calculate it.
2102          *
2103          * While not officially supported, a side effect of handling it at
2104          * the cache level is that a program could retrieve the bandwidth
2105          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2106          */
2107         switch (c->delivery_system) {
2108         case SYS_ATSC:
2109         case SYS_DVBC_ANNEX_B:
2110                 c->bandwidth_hz = 6000000;
2111                 break;
2112         case SYS_DVBC_ANNEX_A:
2113                 rolloff = 115;
2114                 break;
2115         case SYS_DVBC_ANNEX_C:
2116                 rolloff = 113;
2117                 break;
2118         case SYS_DVBS:
2119         case SYS_TURBO:
2120         case SYS_ISDBS:
2121                 rolloff = 135;
2122                 break;
2123         case SYS_DVBS2:
2124                 switch (c->rolloff) {
2125                 case ROLLOFF_20:
2126                         rolloff = 120;
2127                         break;
2128                 case ROLLOFF_25:
2129                         rolloff = 125;
2130                         break;
2131                 default:
2132                 case ROLLOFF_35:
2133                         rolloff = 135;
2134                 }
2135                 break;
2136         default:
2137                 break;
2138         }
2139         if (rolloff)
2140                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2141
2142         /* force auto frequency inversion if requested */
2143         if (dvb_force_auto_inversion)
2144                 c->inversion = INVERSION_AUTO;
2145
2146         /*
2147          * without hierarchical coding code_rate_LP is irrelevant,
2148          * so we tolerate the otherwise invalid FEC_NONE setting
2149          */
2150         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2151                 c->code_rate_LP = FEC_AUTO;
2152
2153         /* get frontend-specific tuning settings */
2154         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2155         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2156                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2157                 fepriv->max_drift = fetunesettings.max_drift;
2158                 fepriv->step_size = fetunesettings.step_size;
2159         } else {
2160                 /* default values */
2161                 switch (c->delivery_system) {
2162                 case SYS_DVBS:
2163                 case SYS_DVBS2:
2164                 case SYS_ISDBS:
2165                 case SYS_TURBO:
2166                 case SYS_DVBC_ANNEX_A:
2167                 case SYS_DVBC_ANNEX_C:
2168                         fepriv->min_delay = HZ / 20;
2169                         fepriv->step_size = c->symbol_rate / 16000;
2170                         fepriv->max_drift = c->symbol_rate / 2000;
2171                         break;
2172                 case SYS_DVBT:
2173                 case SYS_DVBT2:
2174                 case SYS_ISDBT:
2175                 case SYS_DTMB:
2176                         fepriv->min_delay = HZ / 20;
2177                         fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
2178                         fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
2179                         break;
2180                 default:
2181                         /*
2182                          * FIXME: This sounds wrong! if freqency_stepsize is
2183                          * defined by the frontend, why not use it???
2184                          */
2185                         fepriv->min_delay = HZ / 20;
2186                         fepriv->step_size = 0; /* no zigzag */
2187                         fepriv->max_drift = 0;
2188                         break;
2189                 }
2190         }
2191         if (dvb_override_tune_delay > 0)
2192                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2193
2194         fepriv->state = FESTATE_RETUNE;
2195
2196         /* Request the search algorithm to search */
2197         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2198
2199         dvb_frontend_clear_events(fe);
2200         dvb_frontend_add_event(fe, 0);
2201         dvb_frontend_wakeup(fe);
2202         fepriv->status = 0;
2203
2204         return 0;
2205 }
2206
2207
2208 static int dvb_frontend_ioctl_legacy(struct file *file,
2209                         unsigned int cmd, void *parg)
2210 {
2211         struct dvb_device *dvbdev = file->private_data;
2212         struct dvb_frontend *fe = dvbdev->priv;
2213         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2214         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2215         int err = -EOPNOTSUPP;
2216
2217         switch (cmd) {
2218         case FE_GET_INFO: {
2219                 struct dvb_frontend_info* info = parg;
2220
2221                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
2222                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);
2223
2224                 /*
2225                  * Associate the 4 delivery systems supported by DVBv3
2226                  * API with their DVBv5 counterpart. For the other standards,
2227                  * use the closest type, assuming that it would hopefully
2228                  * work with a DVBv3 application.
2229                  * It should be noticed that, on multi-frontend devices with
2230                  * different types (terrestrial and cable, for example),
2231                  * a pure DVBv3 application won't be able to use all delivery
2232                  * systems. Yet, changing the DVBv5 cache to the other delivery
2233                  * system should be enough for making it work.
2234                  */
2235                 switch (dvbv3_type(c->delivery_system)) {
2236                 case DVBV3_QPSK:
2237                         info->type = FE_QPSK;
2238                         break;
2239                 case DVBV3_ATSC:
2240                         info->type = FE_ATSC;
2241                         break;
2242                 case DVBV3_QAM:
2243                         info->type = FE_QAM;
2244                         break;
2245                 case DVBV3_OFDM:
2246                         info->type = FE_OFDM;
2247                         break;
2248                 default:
2249                         dev_err(fe->dvb->device,
2250                                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2251                                         __func__, c->delivery_system);
2252                         fe->ops.info.type = FE_OFDM;
2253                 }
2254                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2255                                  __func__, c->delivery_system, fe->ops.info.type);
2256
2257                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2258                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2259                         info->caps |= FE_CAN_INVERSION_AUTO;
2260                 err = 0;
2261                 break;
2262         }
2263
2264         case FE_READ_STATUS: {
2265                 enum fe_status *status = parg;
2266
2267                 /* if retune was requested but hasn't occurred yet, prevent
2268                  * that user get signal state from previous tuning */
2269                 if (fepriv->state == FESTATE_RETUNE ||
2270                     fepriv->state == FESTATE_ERROR) {
2271                         err=0;
2272                         *status = 0;
2273                         break;
2274                 }
2275
2276                 if (fe->ops.read_status)
2277                         err = fe->ops.read_status(fe, status);
2278                 break;
2279         }
2280
2281         case FE_READ_BER:
2282                 if (fe->ops.read_ber) {
2283                         if (fepriv->thread)
2284                                 err = fe->ops.read_ber(fe, (__u32 *) parg);
2285                         else
2286                                 err = -EAGAIN;
2287                 }
2288                 break;
2289
2290         case FE_READ_SIGNAL_STRENGTH:
2291                 if (fe->ops.read_signal_strength) {
2292                         if (fepriv->thread)
2293                                 err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
2294                         else
2295                                 err = -EAGAIN;
2296                 }
2297                 break;
2298
2299         case FE_READ_SNR:
2300                 if (fe->ops.read_snr) {
2301                         if (fepriv->thread)
2302                                 err = fe->ops.read_snr(fe, (__u16 *) parg);
2303                         else
2304                                 err = -EAGAIN;
2305                 }
2306                 break;
2307
2308         case FE_READ_UNCORRECTED_BLOCKS:
2309                 if (fe->ops.read_ucblocks) {
2310                         if (fepriv->thread)
2311                                 err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
2312                         else
2313                                 err = -EAGAIN;
2314                 }
2315                 break;
2316
2317         case FE_DISEQC_RESET_OVERLOAD:
2318                 if (fe->ops.diseqc_reset_overload) {
2319                         err = fe->ops.diseqc_reset_overload(fe);
2320                         fepriv->state = FESTATE_DISEQC;
2321                         fepriv->status = 0;
2322                 }
2323                 break;
2324
2325         case FE_DISEQC_SEND_MASTER_CMD:
2326                 if (fe->ops.diseqc_send_master_cmd) {
2327                         struct dvb_diseqc_master_cmd *cmd = parg;
2328
2329                         if (cmd->msg_len > sizeof(cmd->msg)) {
2330                                 err = -EINVAL;
2331                                 break;
2332                         }
2333                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2334                         fepriv->state = FESTATE_DISEQC;
2335                         fepriv->status = 0;
2336                 }
2337                 break;
2338
2339         case FE_DISEQC_SEND_BURST:
2340                 if (fe->ops.diseqc_send_burst) {
2341                         err = fe->ops.diseqc_send_burst(fe,
2342                                                 (enum fe_sec_mini_cmd)parg);
2343                         fepriv->state = FESTATE_DISEQC;
2344                         fepriv->status = 0;
2345                 }
2346                 break;
2347
2348         case FE_SET_TONE:
2349                 if (fe->ops.set_tone) {
2350                         err = fe->ops.set_tone(fe,
2351                                                (enum fe_sec_tone_mode)parg);
2352                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2353                         fepriv->state = FESTATE_DISEQC;
2354                         fepriv->status = 0;
2355                 }
2356                 break;
2357
2358         case FE_SET_VOLTAGE:
2359                 if (fe->ops.set_voltage) {
2360                         err = fe->ops.set_voltage(fe,
2361                                                   (enum fe_sec_voltage)parg);
2362                         fepriv->voltage = (enum fe_sec_voltage)parg;
2363                         fepriv->state = FESTATE_DISEQC;
2364                         fepriv->status = 0;
2365                 }
2366                 break;
2367
2368         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2369                 if (fe->ops.dishnetwork_send_legacy_command) {
2370                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2371                                                          (unsigned long)parg);
2372                         fepriv->state = FESTATE_DISEQC;
2373                         fepriv->status = 0;
2374                 } else if (fe->ops.set_voltage) {
2375                         /*
2376                          * NOTE: This is a fallback condition.  Some frontends
2377                          * (stv0299 for instance) take longer than 8msec to
2378                          * respond to a set_voltage command.  Those switches
2379                          * need custom routines to switch properly.  For all
2380                          * other frontends, the following should work ok.
2381                          * Dish network legacy switches (as used by Dish500)
2382                          * are controlled by sending 9-bit command words
2383                          * spaced 8msec apart.
2384                          * the actual command word is switch/port dependent
2385                          * so it is up to the userspace application to send
2386                          * the right command.
2387                          * The command must always start with a '0' after
2388                          * initialization, so parg is 8 bits and does not
2389                          * include the initialization or start bit
2390                          */
2391                         unsigned long swcmd = ((unsigned long) parg) << 1;
2392                         ktime_t nexttime;
2393                         ktime_t tv[10];
2394                         int i;
2395                         u8 last = 1;
2396                         if (dvb_frontend_debug)
2397                                 dprintk("%s switch command: 0x%04lx\n",
2398                                         __func__, swcmd);
2399                         nexttime = ktime_get_boottime();
2400                         if (dvb_frontend_debug)
2401                                 tv[0] = nexttime;
2402                         /* before sending a command, initialize by sending
2403                          * a 32ms 18V to the switch
2404                          */
2405                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2406                         dvb_frontend_sleep_until(&nexttime, 32000);
2407
2408                         for (i = 0; i < 9; i++) {
2409                                 if (dvb_frontend_debug)
2410                                         tv[i+1] = ktime_get_boottime();
2411                                 if ((swcmd & 0x01) != last) {
2412                                         /* set voltage to (last ? 13V : 18V) */
2413                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2414                                         last = (last) ? 0 : 1;
2415                                 }
2416                                 swcmd = swcmd >> 1;
2417                                 if (i != 8)
2418                                         dvb_frontend_sleep_until(&nexttime, 8000);
2419                         }
2420                         if (dvb_frontend_debug) {
2421                                 dprintk("%s(%d): switch delay (should be 32k followed by all 8k)\n",
2422                                         __func__, fe->dvb->num);
2423                                 for (i = 1; i < 10; i++)
2424                                         pr_info("%d: %d\n", i,
2425                                         (int) ktime_us_delta(tv[i], tv[i-1]));
2426                         }
2427                         err = 0;
2428                         fepriv->state = FESTATE_DISEQC;
2429                         fepriv->status = 0;
2430                 }
2431                 break;
2432
2433         case FE_DISEQC_RECV_SLAVE_REPLY:
2434                 if (fe->ops.diseqc_recv_slave_reply)
2435                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
2436                 break;
2437
2438         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2439                 if (fe->ops.enable_high_lnb_voltage)
2440                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
2441                 break;
2442
2443         case FE_SET_FRONTEND:
2444                 err = dvbv3_set_delivery_system(fe);
2445                 if (err)
2446                         break;
2447
2448                 err = dtv_property_cache_sync(fe, c, parg);
2449                 if (err)
2450                         break;
2451                 err = dtv_set_frontend(fe);
2452                 break;
2453         case FE_GET_EVENT:
2454                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
2455                 break;
2456
2457         case FE_GET_FRONTEND: {
2458                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2459
2460                 /*
2461                  * Let's use our own copy of property cache, in order to
2462                  * avoid mangling with DTV zigzag logic, as drivers might
2463                  * return crap, if they don't check if the data is available
2464                  * before updating the properties cache.
2465                  */
2466                 err = dtv_get_frontend(fe, &getp, parg);
2467                 break;
2468         }
2469         case FE_SET_FRONTEND_TUNE_MODE:
2470                 fepriv->tune_mode_flags = (unsigned long) parg;
2471                 err = 0;
2472                 break;
2473         }
2474
2475         return err;
2476 }
2477
2478
2479 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2480 {
2481         struct dvb_device *dvbdev = file->private_data;
2482         struct dvb_frontend *fe = dvbdev->priv;
2483         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2484
2485         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2486
2487         poll_wait (file, &fepriv->events.wait_queue, wait);
2488
2489         if (fepriv->events.eventw != fepriv->events.eventr)
2490                 return (POLLIN | POLLRDNORM | POLLPRI);
2491
2492         return 0;
2493 }
2494
2495 static int dvb_frontend_open(struct inode *inode, struct file *file)
2496 {
2497         struct dvb_device *dvbdev = file->private_data;
2498         struct dvb_frontend *fe = dvbdev->priv;
2499         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2500         struct dvb_adapter *adapter = fe->dvb;
2501         int ret;
2502
2503         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2504         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2505                 return -ENODEV;
2506
2507         if (adapter->mfe_shared) {
2508                 mutex_lock (&adapter->mfe_lock);
2509
2510                 if (adapter->mfe_dvbdev == NULL)
2511                         adapter->mfe_dvbdev = dvbdev;
2512
2513                 else if (adapter->mfe_dvbdev != dvbdev) {
2514                         struct dvb_device
2515                                 *mfedev = adapter->mfe_dvbdev;
2516                         struct dvb_frontend
2517                                 *mfe = mfedev->priv;
2518                         struct dvb_frontend_private
2519                                 *mfepriv = mfe->frontend_priv;
2520                         int mferetry = (dvb_mfe_wait_time << 1);
2521
2522                         mutex_unlock (&adapter->mfe_lock);
2523                         while (mferetry-- && (mfedev->users != -1 ||
2524                                         mfepriv->thread != NULL)) {
2525                                 if(msleep_interruptible(500)) {
2526                                         if(signal_pending(current))
2527                                                 return -EINTR;
2528                                 }
2529                         }
2530
2531                         mutex_lock (&adapter->mfe_lock);
2532                         if(adapter->mfe_dvbdev != dvbdev) {
2533                                 mfedev = adapter->mfe_dvbdev;
2534                                 mfe = mfedev->priv;
2535                                 mfepriv = mfe->frontend_priv;
2536                                 if (mfedev->users != -1 ||
2537                                                 mfepriv->thread != NULL) {
2538                                         mutex_unlock (&adapter->mfe_lock);
2539                                         return -EBUSY;
2540                                 }
2541                                 adapter->mfe_dvbdev = dvbdev;
2542                         }
2543                 }
2544         }
2545
2546         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2547                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2548                         goto err0;
2549
2550                 /* If we took control of the bus, we need to force
2551                    reinitialization.  This is because many ts_bus_ctrl()
2552                    functions strobe the RESET pin on the demod, and if the
2553                    frontend thread already exists then the dvb_init() routine
2554                    won't get called (which is what usually does initial
2555                    register configuration). */
2556                 fepriv->reinitialise = 1;
2557         }
2558
2559         if ((ret = dvb_generic_open (inode, file)) < 0)
2560                 goto err1;
2561
2562         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2563                 /* normal tune mode when opened R/W */
2564                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2565                 fepriv->tone = -1;
2566                 fepriv->voltage = -1;
2567
2568 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2569                 if (fe->dvb->mdev) {
2570                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2571                         if (fe->dvb->mdev->enable_source)
2572                                 ret = fe->dvb->mdev->enable_source(
2573                                                            dvbdev->entity,
2574                                                            &fepriv->pipe);
2575                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2576                         if (ret) {
2577                                 dev_err(fe->dvb->device,
2578                                         "Tuner is busy. Error %d\n", ret);
2579                                 goto err2;
2580                         }
2581                 }
2582 #endif
2583                 ret = dvb_frontend_start (fe);
2584                 if (ret)
2585                         goto err3;
2586
2587                 /*  empty event queue */
2588                 fepriv->events.eventr = fepriv->events.eventw = 0;
2589         }
2590
2591         dvb_frontend_get(fe);
2592
2593         if (adapter->mfe_shared)
2594                 mutex_unlock (&adapter->mfe_lock);
2595         return ret;
2596
2597 err3:
2598 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2599         if (fe->dvb->mdev) {
2600                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2601                 if (fe->dvb->mdev->disable_source)
2602                         fe->dvb->mdev->disable_source(dvbdev->entity);
2603                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2604         }
2605 err2:
2606 #endif
2607         dvb_generic_release(inode, file);
2608 err1:
2609         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2610                 fe->ops.ts_bus_ctrl(fe, 0);
2611 err0:
2612         if (adapter->mfe_shared)
2613                 mutex_unlock (&adapter->mfe_lock);
2614         return ret;
2615 }
2616
2617 static int dvb_frontend_release(struct inode *inode, struct file *file)
2618 {
2619         struct dvb_device *dvbdev = file->private_data;
2620         struct dvb_frontend *fe = dvbdev->priv;
2621         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2622         int ret;
2623
2624         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2625
2626         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2627                 fepriv->release_jiffies = jiffies;
2628                 mb();
2629         }
2630
2631         ret = dvb_generic_release (inode, file);
2632
2633         if (dvbdev->users == -1) {
2634                 wake_up(&fepriv->wait_queue);
2635 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2636                 if (fe->dvb->mdev) {
2637                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2638                         if (fe->dvb->mdev->disable_source)
2639                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2640                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2641                 }
2642 #endif
2643                 if (fe->exit != DVB_FE_NO_EXIT)
2644                         wake_up(&dvbdev->wait_queue);
2645                 if (fe->ops.ts_bus_ctrl)
2646                         fe->ops.ts_bus_ctrl(fe, 0);
2647         }
2648
2649         dvb_frontend_put(fe);
2650
2651         return ret;
2652 }
2653
2654 static const struct file_operations dvb_frontend_fops = {
2655         .owner          = THIS_MODULE,
2656         .unlocked_ioctl = dvb_generic_ioctl,
2657         .poll           = dvb_frontend_poll,
2658         .open           = dvb_frontend_open,
2659         .release        = dvb_frontend_release,
2660         .llseek         = noop_llseek,
2661 };
2662
2663 int dvb_frontend_suspend(struct dvb_frontend *fe)
2664 {
2665         int ret = 0;
2666
2667         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2668                         fe->id);
2669
2670         if (fe->ops.tuner_ops.suspend)
2671                 ret = fe->ops.tuner_ops.suspend(fe);
2672         else if (fe->ops.tuner_ops.sleep)
2673                 ret = fe->ops.tuner_ops.sleep(fe);
2674
2675         if (fe->ops.sleep)
2676                 ret = fe->ops.sleep(fe);
2677
2678         return ret;
2679 }
2680 EXPORT_SYMBOL(dvb_frontend_suspend);
2681
2682 int dvb_frontend_resume(struct dvb_frontend *fe)
2683 {
2684         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2685         int ret = 0;
2686
2687         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2688                         fe->id);
2689
2690         fe->exit = DVB_FE_DEVICE_RESUME;
2691         if (fe->ops.init)
2692                 ret = fe->ops.init(fe);
2693
2694         if (fe->ops.tuner_ops.resume)
2695                 ret = fe->ops.tuner_ops.resume(fe);
2696         else if (fe->ops.tuner_ops.init)
2697                 ret = fe->ops.tuner_ops.init(fe);
2698
2699         if (fe->ops.set_tone && fepriv->tone != -1)
2700                 fe->ops.set_tone(fe, fepriv->tone);
2701         if (fe->ops.set_voltage && fepriv->voltage != -1)
2702                 fe->ops.set_voltage(fe, fepriv->voltage);
2703
2704         fe->exit = DVB_FE_NO_EXIT;
2705         fepriv->state = FESTATE_RETUNE;
2706         dvb_frontend_wakeup(fe);
2707
2708         return ret;
2709 }
2710 EXPORT_SYMBOL(dvb_frontend_resume);
2711
2712 int dvb_register_frontend(struct dvb_adapter* dvb,
2713                           struct dvb_frontend* fe)
2714 {
2715         struct dvb_frontend_private *fepriv;
2716         const struct dvb_device dvbdev_template = {
2717                 .users = ~0,
2718                 .writers = 1,
2719                 .readers = (~0)-1,
2720                 .fops = &dvb_frontend_fops,
2721 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2722                 .name = fe->ops.info.name,
2723 #endif
2724                 .kernel_ioctl = dvb_frontend_ioctl
2725         };
2726
2727         dev_dbg(dvb->device, "%s:\n", __func__);
2728
2729         if (mutex_lock_interruptible(&frontend_mutex))
2730                 return -ERESTARTSYS;
2731
2732         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2733         if (fe->frontend_priv == NULL) {
2734                 mutex_unlock(&frontend_mutex);
2735                 return -ENOMEM;
2736         }
2737         fepriv = fe->frontend_priv;
2738
2739         kref_init(&fe->refcount);
2740
2741         /*
2742          * After initialization, there need to be two references: one
2743          * for dvb_unregister_frontend(), and another one for
2744          * dvb_frontend_detach().
2745          */
2746         dvb_frontend_get(fe);
2747
2748         sema_init(&fepriv->sem, 1);
2749         init_waitqueue_head (&fepriv->wait_queue);
2750         init_waitqueue_head (&fepriv->events.wait_queue);
2751         mutex_init(&fepriv->events.mtx);
2752         fe->dvb = dvb;
2753         fepriv->inversion = INVERSION_OFF;
2754
2755         dev_info(fe->dvb->device,
2756                         "DVB: registering adapter %i frontend %i (%s)...\n",
2757                         fe->dvb->num, fe->id, fe->ops.info.name);
2758
2759         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2760                              fe, DVB_DEVICE_FRONTEND, 0);
2761
2762         /*
2763          * Initialize the cache to the proper values according with the
2764          * first supported delivery system (ops->delsys[0])
2765          */
2766
2767         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
2768         dvb_frontend_clear_cache(fe);
2769
2770         mutex_unlock(&frontend_mutex);
2771         return 0;
2772 }
2773 EXPORT_SYMBOL(dvb_register_frontend);
2774
2775 int dvb_unregister_frontend(struct dvb_frontend* fe)
2776 {
2777         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2778         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2779
2780         mutex_lock(&frontend_mutex);
2781         dvb_frontend_stop(fe);
2782         dvb_remove_device(fepriv->dvbdev);
2783
2784         /* fe is invalid now */
2785         mutex_unlock(&frontend_mutex);
2786         dvb_frontend_put(fe);
2787         return 0;
2788 }
2789 EXPORT_SYMBOL(dvb_unregister_frontend);
2790
2791 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
2792                                         void (*release)(struct dvb_frontend *fe))
2793 {
2794         if (release) {
2795                 release(fe);
2796 #ifdef CONFIG_MEDIA_ATTACH
2797                 dvb_detach(release);
2798 #endif
2799         }
2800 }
2801
2802 void dvb_frontend_detach(struct dvb_frontend* fe)
2803 {
2804         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
2805         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
2806         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
2807         dvb_frontend_invoke_release(fe, fe->ops.detach);
2808         dvb_frontend_put(fe);
2809 }
2810 EXPORT_SYMBOL(dvb_frontend_detach);