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