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  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  26  */
  27
  28 /* Enables DVBv3 compatibility bits at the headers */
  29 #define __DVB_CORE__
  30
  31 #include <linux/string.h>
  32 #include <linux/kernel.h>
  33 #include <linux/sched.h>
  34 #include <linux/wait.h>
  35 #include <linux/slab.h>
  36 #include <linux/poll.h>
  37 #include <linux/semaphore.h>
  38 #include <linux/module.h>
  39 #include <linux/list.h>
  40 #include <linux/freezer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kthread.h>
  43 #include <linux/ktime.h>
  44 #include <asm/processor.h>
  45
  46 #include "dvb_frontend.h"
  47 #include "dvbdev.h"
  48 #include <linux/dvb/version.h>
  49
  50 static int dvb_frontend_debug;
  51 static int dvb_shutdown_timeout;
  52 static int dvb_force_auto_inversion;
  53 static int dvb_override_tune_delay;
  54 static int dvb_powerdown_on_sleep = 1;
  55 static int dvb_mfe_wait_time = 5;
  56
  57 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  58 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  59 module_param(dvb_shutdown_timeout, int, 0644);
  60 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  61 module_param(dvb_force_auto_inversion, int, 0644);
  62 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  63 module_param(dvb_override_tune_delay, int, 0644);
  64 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  65 module_param(dvb_powerdown_on_sleep, int, 0644);
  66 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  67 module_param(dvb_mfe_wait_time, int, 0644);
  68 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  69
  70 #define FESTATE_IDLE 1
  71 #define FESTATE_RETUNE 2
  72 #define FESTATE_TUNING_FAST 4
  73 #define FESTATE_TUNING_SLOW 8
  74 #define FESTATE_TUNED 16
  75 #define FESTATE_ZIGZAG_FAST 32
  76 #define FESTATE_ZIGZAG_SLOW 64
  77 #define FESTATE_DISEQC 128
  78 #define FESTATE_ERROR 256
  79 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  80 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  81 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  82 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  83
  84 /*
  85  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  86  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  87  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  88  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  89  * FESTATE_TUNED. The frontend has successfully locked on.
  90  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  91  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  92  * FESTATE_DISEQC. A DISEQC command has just been issued.
  93  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  94  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  95  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  96  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  97  */
  98
  99 static DEFINE_MUTEX(frontend_mutex);
 100
 101 struct dvb_frontend_private {
 102
 103         /* thread/frontend values */
 104         struct dvb_device *dvbdev;
 105         struct dvb_frontend_parameters parameters_out;
 106         struct dvb_fe_events events;
 107         struct semaphore sem;
 108         struct list_head list_head;
 109         wait_queue_head_t wait_queue;
 110         struct task_struct *thread;
 111         unsigned long release_jiffies;
 112         unsigned int wakeup;
 113         enum fe_status status;
 114         unsigned long tune_mode_flags;
 115         unsigned int delay;
 116         unsigned int reinitialise;
 117         int tone;
 118         int voltage;
 119
 120         /* swzigzag values */
 121         unsigned int state;
 122         unsigned int bending;
 123         int lnb_drift;
 124         unsigned int inversion;
 125         unsigned int auto_step;
 126         unsigned int auto_sub_step;
 127         unsigned int started_auto_step;
 128         unsigned int min_delay;
 129         unsigned int max_drift;
 130         unsigned int step_size;
 131         int quality;
 132         unsigned int check_wrapped;
 133         enum dvbfe_search algo_status;
 134
 135 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 136         struct media_pipeline pipe;
 137         struct media_entity *pipe_start_entity;
 138 #endif
 139 };
 140
 141 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 142 static int dtv_get_frontend(struct dvb_frontend *fe,
 143                             struct dvb_frontend_parameters *p_out);
 144 static int dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 145                                            struct dvb_frontend_parameters *p);
 146
 147 static bool has_get_frontend(struct dvb_frontend *fe)
 148 {
 149         return fe->ops.get_frontend != NULL;
 150 }
 151
 152 /*
 153  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 154  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 155  * otherwise, a DVBv3 call will fail.
 156  */
 157 enum dvbv3_emulation_type {
 158         DVBV3_UNKNOWN,
 159         DVBV3_QPSK,
 160         DVBV3_QAM,
 161         DVBV3_OFDM,
 162         DVBV3_ATSC,
 163 };
 164
 165 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 166 {
 167         switch (delivery_system) {
 168         case SYS_DVBC_ANNEX_A:
 169         case SYS_DVBC_ANNEX_C:
 170                 return DVBV3_QAM;
 171         case SYS_DVBS:
 172         case SYS_DVBS2:
 173         case SYS_TURBO:
 174         case SYS_ISDBS:
 175         case SYS_DSS:
 176                 return DVBV3_QPSK;
 177         case SYS_DVBT:
 178         case SYS_DVBT2:
 179         case SYS_ISDBT:
 180         case SYS_DTMB:
 181                 return DVBV3_OFDM;
 182         case SYS_ATSC:
 183         case SYS_ATSCMH:
 184         case SYS_DVBC_ANNEX_B:
 185                 return DVBV3_ATSC;
 186         case SYS_UNDEFINED:
 187         case SYS_ISDBC:
 188         case SYS_DVBH:
 189         case SYS_DAB:
 190         default:
 191                 /*
 192                  * Doesn't know how to emulate those types and/or
 193                  * there's no frontend driver from this type yet
 194                  * with some emulation code, so, we're not sure yet how
 195                  * to handle them, or they're not compatible with a DVBv3 call.
 196                  */
 197                 return DVBV3_UNKNOWN;
 198         }
 199 }
 200
 201 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 202                                    enum fe_status status)
 203 {
 204         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 205         struct dvb_fe_events *events = &fepriv->events;
 206         struct dvb_frontend_event *e;
 207         int wp;
 208
 209         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 210
 211         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 212                 dtv_get_frontend(fe, &fepriv->parameters_out);
 213
 214         mutex_lock(&events->mtx);
 215
 216         wp = (events->eventw + 1) % MAX_EVENT;
 217         if (wp == events->eventr) {
 218                 events->overflow = 1;
 219                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 220         }
 221
 222         e = &events->events[events->eventw];
 223         e->status = status;
 224         e->parameters = fepriv->parameters_out;
 225
 226         events->eventw = wp;
 227
 228         mutex_unlock(&events->mtx);
 229
 230         wake_up_interruptible (&events->wait_queue);
 231 }
 232
 233 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 234                             struct dvb_frontend_event *event, int flags)
 235 {
 236         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 237         struct dvb_fe_events *events = &fepriv->events;
 238
 239         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 240
 241         if (events->overflow) {
 242                 events->overflow = 0;
 243                 return -EOVERFLOW;
 244         }
 245
 246         if (events->eventw == events->eventr) {
 247                 int ret;
 248
 249                 if (flags & O_NONBLOCK)
 250                         return -EWOULDBLOCK;
 251
 252                 up(&fepriv->sem);
 253
 254                 ret = wait_event_interruptible (events->wait_queue,
 255                                                 events->eventw != events->eventr);
 256
 257                 if (down_interruptible (&fepriv->sem))
 258                         return -ERESTARTSYS;
 259
 260                 if (ret < 0)
 261                         return ret;
 262         }
 263
 264         mutex_lock(&events->mtx);
 265         *event = events->events[events->eventr];
 266         events->eventr = (events->eventr + 1) % MAX_EVENT;
 267         mutex_unlock(&events->mtx);
 268
 269         return 0;
 270 }
 271
 272 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 273 {
 274         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 275         struct dvb_fe_events *events = &fepriv->events;
 276
 277         mutex_lock(&events->mtx);
 278         events->eventr = events->eventw;
 279         mutex_unlock(&events->mtx);
 280 }
 281
 282 static void dvb_frontend_init(struct dvb_frontend *fe)
 283 {
 284         dev_dbg(fe->dvb->device,
 285                         "%s: initialising adapter %i frontend %i (%s)...\n",
 286                         __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 287
 288         if (fe->ops.init)
 289                 fe->ops.init(fe);
 290         if (fe->ops.tuner_ops.init) {
 291                 if (fe->ops.i2c_gate_ctrl)
 292                         fe->ops.i2c_gate_ctrl(fe, 1);
 293                 fe->ops.tuner_ops.init(fe);
 294                 if (fe->ops.i2c_gate_ctrl)
 295                         fe->ops.i2c_gate_ctrl(fe, 0);
 296         }
 297 }
 298
 299 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 300 {
 301         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 302
 303         fepriv->reinitialise = 1;
 304         dvb_frontend_wakeup(fe);
 305 }
 306 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 307
 308 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 309 {
 310         int q2;
 311         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 312
 313         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 314
 315         if (locked)
 316                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 317         else
 318                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 319
 320         q2 = fepriv->quality - 128;
 321         q2 *= q2;
 322
 323         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 324 }
 325
 326 /**
 327  * Performs automatic twiddling of frontend parameters.
 328  *
 329  * @param fe The frontend concerned.
 330  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 331  * @returns Number of complete iterations that have been performed.
 332  */
 333 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 334 {
 335         int autoinversion;
 336         int ready = 0;
 337         int fe_set_err = 0;
 338         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 339         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 340         int original_inversion = c->inversion;
 341         u32 original_frequency = c->frequency;
 342
 343         /* are we using autoinversion? */
 344         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 345                          (c->inversion == INVERSION_AUTO));
 346
 347         /* setup parameters correctly */
 348         while(!ready) {
 349                 /* calculate the lnb_drift */
 350                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 351
 352                 /* wrap the auto_step if we've exceeded the maximum drift */
 353                 if (fepriv->lnb_drift > fepriv->max_drift) {
 354                         fepriv->auto_step = 0;
 355                         fepriv->auto_sub_step = 0;
 356                         fepriv->lnb_drift = 0;
 357                 }
 358
 359                 /* perform inversion and +/- zigzag */
 360                 switch(fepriv->auto_sub_step) {
 361                 case 0:
 362                         /* try with the current inversion and current drift setting */
 363                         ready = 1;
 364                         break;
 365
 366                 case 1:
 367                         if (!autoinversion) break;
 368
 369                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 370                         ready = 1;
 371                         break;
 372
 373                 case 2:
 374                         if (fepriv->lnb_drift == 0) break;
 375
 376                         fepriv->lnb_drift = -fepriv->lnb_drift;
 377                         ready = 1;
 378                         break;
 379
 380                 case 3:
 381                         if (fepriv->lnb_drift == 0) break;
 382                         if (!autoinversion) break;
 383
 384                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 385                         fepriv->lnb_drift = -fepriv->lnb_drift;
 386                         ready = 1;
 387                         break;
 388
 389                 default:
 390                         fepriv->auto_step++;
 391                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 392                         break;
 393                 }
 394
 395                 if (!ready) fepriv->auto_sub_step++;
 396         }
 397
 398         /* if this attempt would hit where we started, indicate a complete
 399          * iteration has occurred */
 400         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 401             (fepriv->auto_sub_step == 0) && check_wrapped) {
 402                 return 1;
 403         }
 404
 405         dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \
 406                         "auto_sub_step:%i started_auto_step:%i\n",
 407                         __func__, fepriv->lnb_drift, fepriv->inversion,
 408                         fepriv->auto_step, fepriv->auto_sub_step,
 409                         fepriv->started_auto_step);
 410
 411         /* set the frontend itself */
 412         c->frequency += fepriv->lnb_drift;
 413         if (autoinversion)
 414                 c->inversion = fepriv->inversion;
 415         tmp = *c;
 416         if (fe->ops.set_frontend)
 417                 fe_set_err = fe->ops.set_frontend(fe);
 418         *c = tmp;
 419         if (fe_set_err < 0) {
 420                 fepriv->state = FESTATE_ERROR;
 421                 return fe_set_err;
 422         }
 423
 424         c->frequency = original_frequency;
 425         c->inversion = original_inversion;
 426
 427         fepriv->auto_sub_step++;
 428         return 0;
 429 }
 430
 431 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 432 {
 433         enum fe_status s = 0;
 434         int retval = 0;
 435         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 436         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 437
 438         /* if we've got no parameters, just keep idling */
 439         if (fepriv->state & FESTATE_IDLE) {
 440                 fepriv->delay = 3*HZ;
 441                 fepriv->quality = 0;
 442                 return;
 443         }
 444
 445         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 446         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 447                 if (fepriv->state & FESTATE_RETUNE) {
 448                         tmp = *c;
 449                         if (fe->ops.set_frontend)
 450                                 retval = fe->ops.set_frontend(fe);
 451                         *c = tmp;
 452                         if (retval < 0)
 453                                 fepriv->state = FESTATE_ERROR;
 454                         else
 455                                 fepriv->state = FESTATE_TUNED;
 456                 }
 457                 fepriv->delay = 3*HZ;
 458                 fepriv->quality = 0;
 459                 return;
 460         }
 461
 462         /* get the frontend status */
 463         if (fepriv->state & FESTATE_RETUNE) {
 464                 s = 0;
 465         } else {
 466                 if (fe->ops.read_status)
 467                         fe->ops.read_status(fe, &s);
 468                 if (s != fepriv->status) {
 469                         dvb_frontend_add_event(fe, s);
 470                         fepriv->status = s;
 471                 }
 472         }
 473
 474         /* if we're not tuned, and we have a lock, move to the TUNED state */
 475         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 476                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 477                 fepriv->state = FESTATE_TUNED;
 478
 479                 /* if we're tuned, then we have determined the correct inversion */
 480                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 481                     (c->inversion == INVERSION_AUTO)) {
 482                         c->inversion = fepriv->inversion;
 483                 }
 484                 return;
 485         }
 486
 487         /* if we are tuned already, check we're still locked */
 488         if (fepriv->state & FESTATE_TUNED) {
 489                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 490
 491                 /* we're tuned, and the lock is still good... */
 492                 if (s & FE_HAS_LOCK) {
 493                         return;
 494                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 495                         fepriv->state = FESTATE_ZIGZAG_FAST;
 496                         fepriv->started_auto_step = fepriv->auto_step;
 497                         fepriv->check_wrapped = 0;
 498                 }
 499         }
 500
 501         /* don't actually do anything if we're in the LOSTLOCK state,
 502          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 503         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 504             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 505                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 506                 return;
 507         }
 508
 509         /* don't do anything if we're in the DISEQC state, since this
 510          * might be someone with a motorized dish controlled by DISEQC.
 511          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 512         if (fepriv->state & FESTATE_DISEQC) {
 513                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 514                 return;
 515         }
 516
 517         /* if we're in the RETUNE state, set everything up for a brand
 518          * new scan, keeping the current inversion setting, as the next
 519          * tune is _very_ likely to require the same */
 520         if (fepriv->state & FESTATE_RETUNE) {
 521                 fepriv->lnb_drift = 0;
 522                 fepriv->auto_step = 0;
 523                 fepriv->auto_sub_step = 0;
 524                 fepriv->started_auto_step = 0;
 525                 fepriv->check_wrapped = 0;
 526         }
 527
 528         /* fast zigzag. */
 529         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 530                 fepriv->delay = fepriv->min_delay;
 531
 532                 /* perform a tune */
 533                 retval = dvb_frontend_swzigzag_autotune(fe,
 534                                                         fepriv->check_wrapped);
 535                 if (retval < 0) {
 536                         return;
 537                 } else if (retval) {
 538                         /* OK, if we've run out of trials at the fast speed.
 539                          * Drop back to slow for the _next_ attempt */
 540                         fepriv->state = FESTATE_SEARCHING_SLOW;
 541                         fepriv->started_auto_step = fepriv->auto_step;
 542                         return;
 543                 }
 544                 fepriv->check_wrapped = 1;
 545
 546                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 547                  * This ensures we cannot return from an
 548                  * FE_SET_FRONTEND ioctl before the first frontend tune
 549                  * occurs */
 550                 if (fepriv->state & FESTATE_RETUNE) {
 551                         fepriv->state = FESTATE_TUNING_FAST;
 552                 }
 553         }
 554
 555         /* slow zigzag */
 556         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 557                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 558
 559                 /* Note: don't bother checking for wrapping; we stay in this
 560                  * state until we get a lock */
 561                 dvb_frontend_swzigzag_autotune(fe, 0);
 562         }
 563 }
 564
 565 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 566 {
 567         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 568
 569         if (fe->exit != DVB_FE_NO_EXIT)
 570                 return 1;
 571
 572         if (fepriv->dvbdev->writers == 1)
 573                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 574                                   dvb_shutdown_timeout * HZ))
 575                         return 1;
 576
 577         return 0;
 578 }
 579
 580 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 581 {
 582         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 583
 584         if (fepriv->wakeup) {
 585                 fepriv->wakeup = 0;
 586                 return 1;
 587         }
 588         return dvb_frontend_is_exiting(fe);
 589 }
 590
 591 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 592 {
 593         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 594
 595         fepriv->wakeup = 1;
 596         wake_up_interruptible(&fepriv->wait_queue);
 597 }
 598
 599 /**
 600  * dvb_enable_media_tuner() - tries to enable the DVB tuner
 601  *
 602  * @fe:         struct dvb_frontend pointer
 603  *
 604  * This function ensures that just one media tuner is enabled for a given
 605  * frontend. It has two different behaviors:
 606  * - For trivial devices with just one tuner:
 607  *   it just enables the existing tuner->fe link
 608  * - For devices with more than one tuner:
 609  *   It is up to the driver to implement the logic that will enable one tuner
 610  *   and disable the other ones. However, if more than one tuner is enabled for
 611  *   the same frontend, it will print an error message and return -EINVAL.
 612  *
 613  * At return, it will return the error code returned by media_entity_setup_link,
 614  * or 0 if everything is OK, if no tuner is linked to the frontend or if the
 615  * mdev is NULL.
 616  */
 617 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 618 static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 619 {
 620         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 621         struct dvb_adapter *adapter = fe->dvb;
 622         struct media_device *mdev = adapter->mdev;
 623         struct media_entity  *entity, *source;
 624         struct media_link *link, *found_link = NULL;
 625         int ret, n_links = 0, active_links = 0;
 626
 627         fepriv->pipe_start_entity = NULL;
 628
 629         if (!mdev)
 630                 return 0;
 631
 632         entity = fepriv->dvbdev->entity;
 633         fepriv->pipe_start_entity = entity;
 634
 635         list_for_each_entry(link, &entity->links, list) {
 636                 if (link->sink->entity == entity) {
 637                         found_link = link;
 638                         n_links++;
 639                         if (link->flags & MEDIA_LNK_FL_ENABLED)
 640                                 active_links++;
 641                 }
 642         }
 643
 644         if (!n_links || active_links == 1 || !found_link)
 645                 return 0;
 646
 647         /*
 648          * If a frontend has more than one tuner linked, it is up to the driver
 649          * to select with one will be the active one, as the frontend core can't
 650          * guess. If the driver doesn't do that, it is a bug.
 651          */
 652         if (n_links > 1 && active_links != 1) {
 653                 dev_err(fe->dvb->device,
 654                         "WARNING: there are %d active links among %d tuners. This is a driver's bug!\n",
 655                         active_links, n_links);
 656                 return -EINVAL;
 657         }
 658
 659         source = found_link->source->entity;
 660         fepriv->pipe_start_entity = source;
 661         list_for_each_entry(link, &source->links, list) {
 662                 struct media_entity *sink;
 663                 int flags = 0;
 664
 665                 sink = link->sink->entity;
 666                 if (sink == entity)
 667                         flags = MEDIA_LNK_FL_ENABLED;
 668
 669                 ret = media_entity_setup_link(link, flags);
 670                 if (ret) {
 671                         dev_err(fe->dvb->device,
 672                                 "Couldn't change link %s->%s to %s. Error %d\n",
 673                                 source->name, sink->name,
 674                                 flags ? "enabled" : "disabled",
 675                                 ret);
 676                         return ret;
 677                 } else
 678                         dev_dbg(fe->dvb->device,
 679                                 "link %s->%s was %s\n",
 680                                 source->name, sink->name,
 681                                 flags ? "ENABLED" : "disabled");
 682         }
 683         return 0;
 684 }
 685 #endif
 686
 687 static int dvb_frontend_thread(void *data)
 688 {
 689         struct dvb_frontend *fe = data;
 690         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 691         enum fe_status s;
 692         enum dvbfe_algo algo;
 693 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 694         int ret;
 695 #endif
 696
 697         bool re_tune = false;
 698         bool semheld = false;
 699
 700         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 701
 702         fepriv->check_wrapped = 0;
 703         fepriv->quality = 0;
 704         fepriv->delay = 3*HZ;
 705         fepriv->status = 0;
 706         fepriv->wakeup = 0;
 707         fepriv->reinitialise = 0;
 708
 709 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 710         ret = dvb_enable_media_tuner(fe);
 711         if (ret) {
 712                 /* FIXME: return an error if it fails */
 713                 dev_info(fe->dvb->device,
 714                         "proceeding with FE task\n");
 715         } else if (fepriv->pipe_start_entity) {
 716                 ret = media_entity_pipeline_start(fepriv->pipe_start_entity,
 717                                                   &fepriv->pipe);
 718                 if (ret)
 719                         return ret;
 720         }
 721 #endif
 722
 723         dvb_frontend_init(fe);
 724
 725         set_freezable();
 726         while (1) {
 727                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 728 restart:
 729                 wait_event_interruptible_timeout(fepriv->wait_queue,
 730                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
 731                                 || freezing(current),
 732                         fepriv->delay);
 733
 734                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 735                         /* got signal or quitting */
 736                         if (!down_interruptible(&fepriv->sem))
 737                                 semheld = true;
 738                         fe->exit = DVB_FE_NORMAL_EXIT;
 739                         break;
 740                 }
 741
 742                 if (try_to_freeze())
 743                         goto restart;
 744
 745                 if (down_interruptible(&fepriv->sem))
 746                         break;
 747
 748                 if (fepriv->reinitialise) {
 749                         dvb_frontend_init(fe);
 750                         if (fe->ops.set_tone && fepriv->tone != -1)
 751                                 fe->ops.set_tone(fe, fepriv->tone);
 752                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 753                                 fe->ops.set_voltage(fe, fepriv->voltage);
 754                         fepriv->reinitialise = 0;
 755                 }
 756
 757                 /* do an iteration of the tuning loop */
 758                 if (fe->ops.get_frontend_algo) {
 759                         algo = fe->ops.get_frontend_algo(fe);
 760                         switch (algo) {
 761                         case DVBFE_ALGO_HW:
 762                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 763
 764                                 if (fepriv->state & FESTATE_RETUNE) {
 765                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 766                                         re_tune = true;
 767                                         fepriv->state = FESTATE_TUNED;
 768                                 } else {
 769                                         re_tune = false;
 770                                 }
 771
 772                                 if (fe->ops.tune)
 773                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 774
 775                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 776                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 777                                         dvb_frontend_add_event(fe, s);
 778                                         fepriv->status = s;
 779                                 }
 780                                 break;
 781                         case DVBFE_ALGO_SW:
 782                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 783                                 dvb_frontend_swzigzag(fe);
 784                                 break;
 785                         case DVBFE_ALGO_CUSTOM:
 786                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 787                                 if (fepriv->state & FESTATE_RETUNE) {
 788                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 789                                         fepriv->state = FESTATE_TUNED;
 790                                 }
 791                                 /* Case where we are going to search for a carrier
 792                                  * User asked us to retune again for some reason, possibly
 793                                  * requesting a search with a new set of parameters
 794                                  */
 795                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 796                                         if (fe->ops.search) {
 797                                                 fepriv->algo_status = fe->ops.search(fe);
 798                                                 /* We did do a search as was requested, the flags are
 799                                                  * now unset as well and has the flags wrt to search.
 800                                                  */
 801                                         } else {
 802                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 803                                         }
 804                                 }
 805                                 /* Track the carrier if the search was successful */
 806                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 807                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 808                                         fepriv->delay = HZ / 2;
 809                                 }
 810                                 dtv_property_legacy_params_sync(fe, &fepriv->parameters_out);
 811                                 fe->ops.read_status(fe, &s);
 812                                 if (s != fepriv->status) {
 813                                         dvb_frontend_add_event(fe, s); /* update event list */
 814                                         fepriv->status = s;
 815                                         if (!(s & FE_HAS_LOCK)) {
 816                                                 fepriv->delay = HZ / 10;
 817                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 818                                         } else {
 819                                                 fepriv->delay = 60 * HZ;
 820                                         }
 821                                 }
 822                                 break;
 823                         default:
 824                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 825                                 break;
 826                         }
 827                 } else {
 828                         dvb_frontend_swzigzag(fe);
 829                 }
 830         }
 831
 832 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 833         if (fepriv->pipe_start_entity)
 834                 media_entity_pipeline_stop(fepriv->pipe_start_entity);
 835         fepriv->pipe_start_entity = NULL;
 836 #endif
 837
 838         if (dvb_powerdown_on_sleep) {
 839                 if (fe->ops.set_voltage)
 840                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 841                 if (fe->ops.tuner_ops.sleep) {
 842                         if (fe->ops.i2c_gate_ctrl)
 843                                 fe->ops.i2c_gate_ctrl(fe, 1);
 844                         fe->ops.tuner_ops.sleep(fe);
 845                         if (fe->ops.i2c_gate_ctrl)
 846                                 fe->ops.i2c_gate_ctrl(fe, 0);
 847                 }
 848                 if (fe->ops.sleep)
 849                         fe->ops.sleep(fe);
 850         }
 851
 852         fepriv->thread = NULL;
 853         if (kthread_should_stop())
 854                 fe->exit = DVB_FE_DEVICE_REMOVED;
 855         else
 856                 fe->exit = DVB_FE_NO_EXIT;
 857         mb();
 858
 859         if (semheld)
 860                 up(&fepriv->sem);
 861         dvb_frontend_wakeup(fe);
 862         return 0;
 863 }
 864
 865 static void dvb_frontend_stop(struct dvb_frontend *fe)
 866 {
 867         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 868
 869         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 870
 871         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 872                 fe->exit = DVB_FE_NORMAL_EXIT;
 873         mb();
 874
 875         if (!fepriv->thread)
 876                 return;
 877
 878         kthread_stop(fepriv->thread);
 879
 880         sema_init(&fepriv->sem, 1);
 881         fepriv->state = FESTATE_IDLE;
 882
 883         /* paranoia check in case a signal arrived */
 884         if (fepriv->thread)
 885                 dev_warn(fe->dvb->device,
 886                                 "dvb_frontend_stop: warning: thread %p won't exit\n",
 887                                 fepriv->thread);
 888 }
 889
 890 /*
 891  * Sleep for the amount of time given by add_usec parameter
 892  *
 893  * This needs to be as precise as possible, as it affects the detection of
 894  * the dish tone command at the satellite subsystem. The precision is improved
 895  * by using a scheduled msleep followed by udelay for the remainder.
 896  */
 897 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 898 {
 899         s32 delta;
 900
 901         *waketime = ktime_add_us(*waketime, add_usec);
 902         delta = ktime_us_delta(ktime_get_real(), *waketime);
 903         if (delta > 2500) {
 904                 msleep((delta - 1500) / 1000);
 905                 delta = ktime_us_delta(ktime_get_real(), *waketime);
 906         }
 907         if (delta > 0)
 908                 udelay(delta);
 909 }
 910 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 911
 912 static int dvb_frontend_start(struct dvb_frontend *fe)
 913 {
 914         int ret;
 915         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 916         struct task_struct *fe_thread;
 917
 918         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 919
 920         if (fepriv->thread) {
 921                 if (fe->exit == DVB_FE_NO_EXIT)
 922                         return 0;
 923                 else
 924                         dvb_frontend_stop (fe);
 925         }
 926
 927         if (signal_pending(current))
 928                 return -EINTR;
 929         if (down_interruptible (&fepriv->sem))
 930                 return -EINTR;
 931
 932         fepriv->state = FESTATE_IDLE;
 933         fe->exit = DVB_FE_NO_EXIT;
 934         fepriv->thread = NULL;
 935         mb();
 936
 937         fe_thread = kthread_run(dvb_frontend_thread, fe,
 938                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
 939         if (IS_ERR(fe_thread)) {
 940                 ret = PTR_ERR(fe_thread);
 941                 dev_warn(fe->dvb->device,
 942                                 "dvb_frontend_start: failed to start kthread (%d)\n",
 943                                 ret);
 944                 up(&fepriv->sem);
 945                 return ret;
 946         }
 947         fepriv->thread = fe_thread;
 948         return 0;
 949 }
 950
 951 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 952                                         u32 *freq_min, u32 *freq_max)
 953 {
 954         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 955
 956         if (fe->ops.info.frequency_max == 0)
 957                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 958         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 959                 *freq_max = fe->ops.info.frequency_max;
 960         else
 961                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 962
 963         if (*freq_min == 0 || *freq_max == 0)
 964                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 965                                 fe->dvb->num, fe->id);
 966 }
 967
 968 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 969 {
 970         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 971         u32 freq_min;
 972         u32 freq_max;
 973
 974         /* range check: frequency */
 975         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max);
 976         if ((freq_min && c->frequency < freq_min) ||
 977             (freq_max && c->frequency > freq_max)) {
 978                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 979                                 fe->dvb->num, fe->id, c->frequency,
 980                                 freq_min, freq_max);
 981                 return -EINVAL;
 982         }
 983
 984         /* range check: symbol rate */
 985         switch (c->delivery_system) {
 986         case SYS_DVBS:
 987         case SYS_DVBS2:
 988         case SYS_TURBO:
 989         case SYS_DVBC_ANNEX_A:
 990         case SYS_DVBC_ANNEX_C:
 991                 if ((fe->ops.info.symbol_rate_min &&
 992                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 993                     (fe->ops.info.symbol_rate_max &&
 994                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 995                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 996                                         fe->dvb->num, fe->id, c->symbol_rate,
 997                                         fe->ops.info.symbol_rate_min,
 998                                         fe->ops.info.symbol_rate_max);
 999                         return -EINVAL;
1000                 }
1001         default:
1002                 break;
1003         }
1004
1005         return 0;
1006 }
1007
1008 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1009 {
1010         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1011         int i;
1012         u32 delsys;
1013
1014         delsys = c->delivery_system;
1015         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1016         c->delivery_system = delsys;
1017
1018         c->state = DTV_CLEAR;
1019
1020         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1021                         __func__, c->delivery_system);
1022
1023         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1024         c->bandwidth_hz = 0;    /* AUTO */
1025         c->guard_interval = GUARD_INTERVAL_AUTO;
1026         c->hierarchy = HIERARCHY_AUTO;
1027         c->symbol_rate = 0;
1028         c->code_rate_HP = FEC_AUTO;
1029         c->code_rate_LP = FEC_AUTO;
1030         c->fec_inner = FEC_AUTO;
1031         c->rolloff = ROLLOFF_AUTO;
1032         c->voltage = SEC_VOLTAGE_OFF;
1033         c->sectone = SEC_TONE_OFF;
1034         c->pilot = PILOT_AUTO;
1035
1036         c->isdbt_partial_reception = 0;
1037         c->isdbt_sb_mode = 0;
1038         c->isdbt_sb_subchannel = 0;
1039         c->isdbt_sb_segment_idx = 0;
1040         c->isdbt_sb_segment_count = 0;
1041         c->isdbt_layer_enabled = 0;
1042         for (i = 0; i < 3; i++) {
1043                 c->layer[i].fec = FEC_AUTO;
1044                 c->layer[i].modulation = QAM_AUTO;
1045                 c->layer[i].interleaving = 0;
1046                 c->layer[i].segment_count = 0;
1047         }
1048
1049         c->stream_id = NO_STREAM_ID_FILTER;
1050
1051         switch (c->delivery_system) {
1052         case SYS_DVBS:
1053         case SYS_DVBS2:
1054         case SYS_TURBO:
1055                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1056                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1057                 break;
1058         case SYS_ATSC:
1059                 c->modulation = VSB_8;
1060                 break;
1061         case SYS_ISDBS:
1062                 c->symbol_rate = 28860000;
1063                 c->rolloff = ROLLOFF_35;
1064                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1065                 break;
1066         default:
1067                 c->modulation = QAM_AUTO;
1068                 break;
1069         }
1070
1071         c->lna = LNA_AUTO;
1072
1073         return 0;
1074 }
1075
1076 #define _DTV_CMD(n, s, b) \
1077 [n] = { \
1078         .name = #n, \
1079         .cmd  = n, \
1080         .set  = s,\
1081         .buffer = b \
1082 }
1083
1084 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1085         _DTV_CMD(DTV_TUNE, 1, 0),
1086         _DTV_CMD(DTV_CLEAR, 1, 0),
1087
1088         /* Set */
1089         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1090         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1091         _DTV_CMD(DTV_MODULATION, 1, 0),
1092         _DTV_CMD(DTV_INVERSION, 1, 0),
1093         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1094         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1095         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1096         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1097         _DTV_CMD(DTV_TONE, 1, 0),
1098         _DTV_CMD(DTV_PILOT, 1, 0),
1099         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1100         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1101         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1102         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1103         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1104         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1105         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1106         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1107
1108         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1109         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1110         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1111         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1112         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1113         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1114         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1115         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1116         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1117         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1118         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1119         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1120         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1121         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1122         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1123         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1124         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1125         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1126
1127         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1128         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1129         _DTV_CMD(DTV_LNA, 1, 0),
1130
1131         /* Get */
1132         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1133         _DTV_CMD(DTV_API_VERSION, 0, 0),
1134
1135         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1136
1137         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1138         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1139
1140         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1141         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1142         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1143         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1144         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1145         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1146         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1147         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1148         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1149         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1150         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1151         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1152         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1153
1154         /* Statistics API */
1155         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1156         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1157         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1158         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1159         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1160         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1161         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1162         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1163 };
1164
1165 static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp)
1166 {
1167         int i;
1168
1169         if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) {
1170                 dev_warn(fe->dvb->device, "%s: tvp.cmd = 0x%08x undefined\n",
1171                                 __func__, tvp->cmd);
1172                 return;
1173         }
1174
1175         dev_dbg(fe->dvb->device, "%s: tvp.cmd    = 0x%08x (%s)\n", __func__,
1176                         tvp->cmd, dtv_cmds[tvp->cmd].name);
1177
1178         if (dtv_cmds[tvp->cmd].buffer) {
1179                 dev_dbg(fe->dvb->device, "%s: tvp.u.buffer.len = 0x%02x\n",
1180                         __func__, tvp->u.buffer.len);
1181
1182                 for(i = 0; i < tvp->u.buffer.len; i++)
1183                         dev_dbg(fe->dvb->device,
1184                                         "%s: tvp.u.buffer.data[0x%02x] = 0x%02x\n",
1185                                         __func__, i, tvp->u.buffer.data[i]);
1186         } else {
1187                 dev_dbg(fe->dvb->device, "%s: tvp.u.data = 0x%08x\n", __func__,
1188                                 tvp->u.data);
1189         }
1190 }
1191
1192 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1193  * drivers can use a single set_frontend tuning function, regardless of whether
1194  * it's being used for the legacy or new API, reducing code and complexity.
1195  */
1196 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1197                                    struct dtv_frontend_properties *c,
1198                                    const struct dvb_frontend_parameters *p)
1199 {
1200         c->frequency = p->frequency;
1201         c->inversion = p->inversion;
1202
1203         switch (dvbv3_type(c->delivery_system)) {
1204         case DVBV3_QPSK:
1205                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1206                 c->symbol_rate = p->u.qpsk.symbol_rate;
1207                 c->fec_inner = p->u.qpsk.fec_inner;
1208                 break;
1209         case DVBV3_QAM:
1210                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1211                 c->symbol_rate = p->u.qam.symbol_rate;
1212                 c->fec_inner = p->u.qam.fec_inner;
1213                 c->modulation = p->u.qam.modulation;
1214                 break;
1215         case DVBV3_OFDM:
1216                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1217
1218                 switch (p->u.ofdm.bandwidth) {
1219                 case BANDWIDTH_10_MHZ:
1220                         c->bandwidth_hz = 10000000;
1221                         break;
1222                 case BANDWIDTH_8_MHZ:
1223                         c->bandwidth_hz = 8000000;
1224                         break;
1225                 case BANDWIDTH_7_MHZ:
1226                         c->bandwidth_hz = 7000000;
1227                         break;
1228                 case BANDWIDTH_6_MHZ:
1229                         c->bandwidth_hz = 6000000;
1230                         break;
1231                 case BANDWIDTH_5_MHZ:
1232                         c->bandwidth_hz = 5000000;
1233                         break;
1234                 case BANDWIDTH_1_712_MHZ:
1235                         c->bandwidth_hz = 1712000;
1236                         break;
1237                 case BANDWIDTH_AUTO:
1238                         c->bandwidth_hz = 0;
1239                 }
1240
1241                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1242                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1243                 c->modulation = p->u.ofdm.constellation;
1244                 c->transmission_mode = p->u.ofdm.transmission_mode;
1245                 c->guard_interval = p->u.ofdm.guard_interval;
1246                 c->hierarchy = p->u.ofdm.hierarchy_information;
1247                 break;
1248         case DVBV3_ATSC:
1249                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1250                 c->modulation = p->u.vsb.modulation;
1251                 if (c->delivery_system == SYS_ATSCMH)
1252                         break;
1253                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1254                         c->delivery_system = SYS_ATSC;
1255                 else
1256                         c->delivery_system = SYS_DVBC_ANNEX_B;
1257                 break;
1258         case DVBV3_UNKNOWN:
1259                 dev_err(fe->dvb->device,
1260                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1261                                 __func__, c->delivery_system);
1262                 return -EINVAL;
1263         }
1264
1265         return 0;
1266 }
1267
1268 /* Ensure the cached values are set correctly in the frontend
1269  * legacy tuning structures, for the advanced tuning API.
1270  */
1271 static int dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1272                                             struct dvb_frontend_parameters *p)
1273 {
1274         const struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1275
1276         p->frequency = c->frequency;
1277         p->inversion = c->inversion;
1278
1279         switch (dvbv3_type(c->delivery_system)) {
1280         case DVBV3_UNKNOWN:
1281                 dev_err(fe->dvb->device,
1282                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1283                                 __func__, c->delivery_system);
1284                 return -EINVAL;
1285         case DVBV3_QPSK:
1286                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1287                 p->u.qpsk.symbol_rate = c->symbol_rate;
1288                 p->u.qpsk.fec_inner = c->fec_inner;
1289                 break;
1290         case DVBV3_QAM:
1291                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1292                 p->u.qam.symbol_rate = c->symbol_rate;
1293                 p->u.qam.fec_inner = c->fec_inner;
1294                 p->u.qam.modulation = c->modulation;
1295                 break;
1296         case DVBV3_OFDM:
1297                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1298                 switch (c->bandwidth_hz) {
1299                 case 10000000:
1300                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1301                         break;
1302                 case 8000000:
1303                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1304                         break;
1305                 case 7000000:
1306                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1307                         break;
1308                 case 6000000:
1309                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1310                         break;
1311                 case 5000000:
1312                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1313                         break;
1314                 case 1712000:
1315                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1316                         break;
1317                 case 0:
1318                 default:
1319                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1320                 }
1321                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1322                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1323                 p->u.ofdm.constellation = c->modulation;
1324                 p->u.ofdm.transmission_mode = c->transmission_mode;
1325                 p->u.ofdm.guard_interval = c->guard_interval;
1326                 p->u.ofdm.hierarchy_information = c->hierarchy;
1327                 break;
1328         case DVBV3_ATSC:
1329                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1330                 p->u.vsb.modulation = c->modulation;
1331                 break;
1332         }
1333         return 0;
1334 }
1335
1336 /**
1337  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1338  * @fe:         struct dvb_frontend pointer
1339  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1340  * @p_out       struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1341  *
1342  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1343  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1344  * If p_out is not null, it will update the DVBv3 params pointed by it.
1345  */
1346 static int dtv_get_frontend(struct dvb_frontend *fe,
1347                             struct dvb_frontend_parameters *p_out)
1348 {
1349         int r;
1350
1351         if (fe->ops.get_frontend) {
1352                 r = fe->ops.get_frontend(fe);
1353                 if (unlikely(r < 0))
1354                         return r;
1355                 if (p_out)
1356                         dtv_property_legacy_params_sync(fe, p_out);
1357                 return 0;
1358         }
1359
1360         /* As everything is in cache, get_frontend fops are always supported */
1361         return 0;
1362 }
1363
1364 static int dvb_frontend_ioctl_legacy(struct file *file,
1365                         unsigned int cmd, void *parg);
1366 static int dvb_frontend_ioctl_properties(struct file *file,
1367                         unsigned int cmd, void *parg);
1368
1369 static int dtv_property_process_get(struct dvb_frontend *fe,
1370                                     const struct dtv_frontend_properties *c,
1371                                     struct dtv_property *tvp,
1372                                     struct file *file)
1373 {
1374         int r, ncaps;
1375
1376         switch(tvp->cmd) {
1377         case DTV_ENUM_DELSYS:
1378                 ncaps = 0;
1379                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1380                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1381                         ncaps++;
1382                 }
1383                 tvp->u.buffer.len = ncaps;
1384                 break;
1385         case DTV_FREQUENCY:
1386                 tvp->u.data = c->frequency;
1387                 break;
1388         case DTV_MODULATION:
1389                 tvp->u.data = c->modulation;
1390                 break;
1391         case DTV_BANDWIDTH_HZ:
1392                 tvp->u.data = c->bandwidth_hz;
1393                 break;
1394         case DTV_INVERSION:
1395                 tvp->u.data = c->inversion;
1396                 break;
1397         case DTV_SYMBOL_RATE:
1398                 tvp->u.data = c->symbol_rate;
1399                 break;
1400         case DTV_INNER_FEC:
1401                 tvp->u.data = c->fec_inner;
1402                 break;
1403         case DTV_PILOT:
1404                 tvp->u.data = c->pilot;
1405                 break;
1406         case DTV_ROLLOFF:
1407                 tvp->u.data = c->rolloff;
1408                 break;
1409         case DTV_DELIVERY_SYSTEM:
1410                 tvp->u.data = c->delivery_system;
1411                 break;
1412         case DTV_VOLTAGE:
1413                 tvp->u.data = c->voltage;
1414                 break;
1415         case DTV_TONE:
1416                 tvp->u.data = c->sectone;
1417                 break;
1418         case DTV_API_VERSION:
1419                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1420                 break;
1421         case DTV_CODE_RATE_HP:
1422                 tvp->u.data = c->code_rate_HP;
1423                 break;
1424         case DTV_CODE_RATE_LP:
1425                 tvp->u.data = c->code_rate_LP;
1426                 break;
1427         case DTV_GUARD_INTERVAL:
1428                 tvp->u.data = c->guard_interval;
1429                 break;
1430         case DTV_TRANSMISSION_MODE:
1431                 tvp->u.data = c->transmission_mode;
1432                 break;
1433         case DTV_HIERARCHY:
1434                 tvp->u.data = c->hierarchy;
1435                 break;
1436         case DTV_INTERLEAVING:
1437                 tvp->u.data = c->interleaving;
1438                 break;
1439
1440         /* ISDB-T Support here */
1441         case DTV_ISDBT_PARTIAL_RECEPTION:
1442                 tvp->u.data = c->isdbt_partial_reception;
1443                 break;
1444         case DTV_ISDBT_SOUND_BROADCASTING:
1445                 tvp->u.data = c->isdbt_sb_mode;
1446                 break;
1447         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1448                 tvp->u.data = c->isdbt_sb_subchannel;
1449                 break;
1450         case DTV_ISDBT_SB_SEGMENT_IDX:
1451                 tvp->u.data = c->isdbt_sb_segment_idx;
1452                 break;
1453         case DTV_ISDBT_SB_SEGMENT_COUNT:
1454                 tvp->u.data = c->isdbt_sb_segment_count;
1455                 break;
1456         case DTV_ISDBT_LAYER_ENABLED:
1457                 tvp->u.data = c->isdbt_layer_enabled;
1458                 break;
1459         case DTV_ISDBT_LAYERA_FEC:
1460                 tvp->u.data = c->layer[0].fec;
1461                 break;
1462         case DTV_ISDBT_LAYERA_MODULATION:
1463                 tvp->u.data = c->layer[0].modulation;
1464                 break;
1465         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1466                 tvp->u.data = c->layer[0].segment_count;
1467                 break;
1468         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1469                 tvp->u.data = c->layer[0].interleaving;
1470                 break;
1471         case DTV_ISDBT_LAYERB_FEC:
1472                 tvp->u.data = c->layer[1].fec;
1473                 break;
1474         case DTV_ISDBT_LAYERB_MODULATION:
1475                 tvp->u.data = c->layer[1].modulation;
1476                 break;
1477         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1478                 tvp->u.data = c->layer[1].segment_count;
1479                 break;
1480         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1481                 tvp->u.data = c->layer[1].interleaving;
1482                 break;
1483         case DTV_ISDBT_LAYERC_FEC:
1484                 tvp->u.data = c->layer[2].fec;
1485                 break;
1486         case DTV_ISDBT_LAYERC_MODULATION:
1487                 tvp->u.data = c->layer[2].modulation;
1488                 break;
1489         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1490                 tvp->u.data = c->layer[2].segment_count;
1491                 break;
1492         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1493                 tvp->u.data = c->layer[2].interleaving;
1494                 break;
1495
1496         /* Multistream support */
1497         case DTV_STREAM_ID:
1498         case DTV_DVBT2_PLP_ID_LEGACY:
1499                 tvp->u.data = c->stream_id;
1500                 break;
1501
1502         /* ATSC-MH */
1503         case DTV_ATSCMH_FIC_VER:
1504                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1505                 break;
1506         case DTV_ATSCMH_PARADE_ID:
1507                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1508                 break;
1509         case DTV_ATSCMH_NOG:
1510                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1511                 break;
1512         case DTV_ATSCMH_TNOG:
1513                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1514                 break;
1515         case DTV_ATSCMH_SGN:
1516                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1517                 break;
1518         case DTV_ATSCMH_PRC:
1519                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1520                 break;
1521         case DTV_ATSCMH_RS_FRAME_MODE:
1522                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1523                 break;
1524         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1525                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1526                 break;
1527         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1528                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1529                 break;
1530         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1531                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1532                 break;
1533         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1534                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1535                 break;
1536         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1537                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1538                 break;
1539         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1540                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1541                 break;
1542         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1543                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1544                 break;
1545         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1546                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1547                 break;
1548
1549         case DTV_LNA:
1550                 tvp->u.data = c->lna;
1551                 break;
1552
1553         /* Fill quality measures */
1554         case DTV_STAT_SIGNAL_STRENGTH:
1555                 tvp->u.st = c->strength;
1556                 break;
1557         case DTV_STAT_CNR:
1558                 tvp->u.st = c->cnr;
1559                 break;
1560         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1561                 tvp->u.st = c->pre_bit_error;
1562                 break;
1563         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1564                 tvp->u.st = c->pre_bit_count;
1565                 break;
1566         case DTV_STAT_POST_ERROR_BIT_COUNT:
1567                 tvp->u.st = c->post_bit_error;
1568                 break;
1569         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1570                 tvp->u.st = c->post_bit_count;
1571                 break;
1572         case DTV_STAT_ERROR_BLOCK_COUNT:
1573                 tvp->u.st = c->block_error;
1574                 break;
1575         case DTV_STAT_TOTAL_BLOCK_COUNT:
1576                 tvp->u.st = c->block_count;
1577                 break;
1578         default:
1579                 dev_dbg(fe->dvb->device,
1580                         "%s: FE property %d doesn't exist\n",
1581                         __func__, tvp->cmd);
1582                 return -EINVAL;
1583         }
1584
1585         /* Allow the frontend to override outgoing properties */
1586         if (fe->ops.get_property) {
1587                 r = fe->ops.get_property(fe, tvp);
1588                 if (r < 0)
1589                         return r;
1590         }
1591
1592         dtv_property_dump(fe, tvp);
1593
1594         return 0;
1595 }
1596
1597 static int dtv_set_frontend(struct dvb_frontend *fe);
1598
1599 static bool is_dvbv3_delsys(u32 delsys)
1600 {
1601         bool status;
1602
1603         status = (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1604                  (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1605
1606         return status;
1607 }
1608
1609 /**
1610  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1611  * @fe:                 struct frontend;
1612  * @delsys:                     DVBv5 type that will be used for emulation
1613  *
1614  * Provides emulation for delivery systems that are compatible with the old
1615  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1616  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1617  * parameters are compatible with DVB-S spec.
1618  */
1619 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1620 {
1621         int i;
1622         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1623
1624         c->delivery_system = delsys;
1625
1626         /*
1627          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1628          */
1629         if (c->delivery_system == SYS_ISDBT) {
1630                 dev_dbg(fe->dvb->device,
1631                         "%s: Using defaults for SYS_ISDBT\n",
1632                         __func__);
1633
1634                 if (!c->bandwidth_hz)
1635                         c->bandwidth_hz = 6000000;
1636
1637                 c->isdbt_partial_reception = 0;
1638                 c->isdbt_sb_mode = 0;
1639                 c->isdbt_sb_subchannel = 0;
1640                 c->isdbt_sb_segment_idx = 0;
1641                 c->isdbt_sb_segment_count = 0;
1642                 c->isdbt_layer_enabled = 7;
1643                 for (i = 0; i < 3; i++) {
1644                         c->layer[i].fec = FEC_AUTO;
1645                         c->layer[i].modulation = QAM_AUTO;
1646                         c->layer[i].interleaving = 0;
1647                         c->layer[i].segment_count = 0;
1648                 }
1649         }
1650         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1651                 __func__, c->delivery_system);
1652
1653         return 0;
1654 }
1655
1656 /**
1657  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1658  * @fe:                 frontend struct
1659  * @desired_system:     delivery system requested by the user
1660  *
1661  * A DVBv5 call know what's the desired system it wants. So, set it.
1662  *
1663  * There are, however, a few known issues with early DVBv5 applications that
1664  * are also handled by this logic:
1665  *
1666  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1667  *    This is an API violation, but, as we don't want to break userspace,
1668  *    convert it to the first supported delivery system.
1669  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1670  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1671  *    ISDB-T provided backward compat with DVB-T.
1672  */
1673 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1674                                      u32 desired_system)
1675 {
1676         int ncaps;
1677         u32 delsys = SYS_UNDEFINED;
1678         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1679         enum dvbv3_emulation_type type;
1680
1681         /*
1682          * It was reported that some old DVBv5 applications were
1683          * filling delivery_system with SYS_UNDEFINED. If this happens,
1684          * assume that the application wants to use the first supported
1685          * delivery system.
1686          */
1687         if (desired_system == SYS_UNDEFINED)
1688                 desired_system = fe->ops.delsys[0];
1689
1690         /*
1691          * This is a DVBv5 call. So, it likely knows the supported
1692          * delivery systems. So, check if the desired delivery system is
1693          * supported
1694          */
1695         ncaps = 0;
1696         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1697                 if (fe->ops.delsys[ncaps] == desired_system) {
1698                         c->delivery_system = desired_system;
1699                         dev_dbg(fe->dvb->device,
1700                                         "%s: Changing delivery system to %d\n",
1701                                         __func__, desired_system);
1702                         return 0;
1703                 }
1704                 ncaps++;
1705         }
1706
1707         /*
1708          * The requested delivery system isn't supported. Maybe userspace
1709          * is requesting a DVBv3 compatible delivery system.
1710          *
1711          * The emulation only works if the desired system is one of the
1712          * delivery systems supported by DVBv3 API
1713          */
1714         if (!is_dvbv3_delsys(desired_system)) {
1715                 dev_dbg(fe->dvb->device,
1716                         "%s: Delivery system %d not supported.\n",
1717                         __func__, desired_system);
1718                 return -EINVAL;
1719         }
1720
1721         type = dvbv3_type(desired_system);
1722
1723         /*
1724         * Get the last non-DVBv3 delivery system that has the same type
1725         * of the desired system
1726         */
1727         ncaps = 0;
1728         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1729                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1730                         delsys = fe->ops.delsys[ncaps];
1731                 ncaps++;
1732         }
1733
1734         /* There's nothing compatible with the desired delivery system */
1735         if (delsys == SYS_UNDEFINED) {
1736                 dev_dbg(fe->dvb->device,
1737                         "%s: Delivery system %d not supported on emulation mode.\n",
1738                         __func__, desired_system);
1739                 return -EINVAL;
1740         }
1741
1742         dev_dbg(fe->dvb->device,
1743                 "%s: Using delivery system %d emulated as if it were %d\n",
1744                 __func__, delsys, desired_system);
1745
1746         return emulate_delivery_system(fe, desired_system);
1747 }
1748
1749 /**
1750  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1751  * @fe: frontend struct
1752  *
1753  * A DVBv3 call doesn't know what's the desired system it wants. It also
1754  * doesn't allow to switch between different types. Due to that, userspace
1755  * should use DVBv5 instead.
1756  * However, in order to avoid breaking userspace API, limited backward
1757  * compatibility support is provided.
1758  *
1759  * There are some delivery systems that are incompatible with DVBv3 calls.
1760  *
1761  * This routine should work fine for frontends that support just one delivery
1762  * system.
1763  *
1764  * For frontends that support multiple frontends:
1765  * 1) It defaults to use the first supported delivery system. There's an
1766  *    userspace application that allows changing it at runtime;
1767  *
1768  * 2) If the current delivery system is not compatible with DVBv3, it gets
1769  *    the first one that it is compatible.
1770  *
1771  * NOTE: in order for this to work with applications like Kaffeine that
1772  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1773  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1774  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1775  *      to DVB-S.
1776  */
1777 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1778 {
1779         int ncaps;
1780         u32 delsys = SYS_UNDEFINED;
1781         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1782
1783         /* If not set yet, defaults to the first supported delivery system */
1784         if (c->delivery_system == SYS_UNDEFINED)
1785                 c->delivery_system = fe->ops.delsys[0];
1786
1787         /*
1788          * Trivial case: just use the current one, if it already a DVBv3
1789          * delivery system
1790          */
1791         if (is_dvbv3_delsys(c->delivery_system)) {
1792                 dev_dbg(fe->dvb->device,
1793                                 "%s: Using delivery system to %d\n",
1794                                 __func__, c->delivery_system);
1795                 return 0;
1796         }
1797
1798         /*
1799          * Seek for the first delivery system that it is compatible with a
1800          * DVBv3 standard
1801          */
1802         ncaps = 0;
1803         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1804                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1805                         delsys = fe->ops.delsys[ncaps];
1806                         break;
1807                 }
1808                 ncaps++;
1809         }
1810         if (delsys == SYS_UNDEFINED) {
1811                 dev_dbg(fe->dvb->device,
1812                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1813                         __func__);
1814                 return -EINVAL;
1815         }
1816         return emulate_delivery_system(fe, delsys);
1817 }
1818
1819 static int dtv_property_process_set(struct dvb_frontend *fe,
1820                                     struct dtv_property *tvp,
1821                                     struct file *file)
1822 {
1823         int r = 0;
1824         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1825
1826         /* Allow the frontend to validate incoming properties */
1827         if (fe->ops.set_property) {
1828                 r = fe->ops.set_property(fe, tvp);
1829                 if (r < 0)
1830                         return r;
1831         }
1832
1833         switch(tvp->cmd) {
1834         case DTV_CLEAR:
1835                 /*
1836                  * Reset a cache of data specific to the frontend here. This does
1837                  * not effect hardware.
1838                  */
1839                 dvb_frontend_clear_cache(fe);
1840                 break;
1841         case DTV_TUNE:
1842                 /* interpret the cache of data, build either a traditional frontend
1843                  * tunerequest so we can pass validation in the FE_SET_FRONTEND
1844                  * ioctl.
1845                  */
1846                 c->state = tvp->cmd;
1847                 dev_dbg(fe->dvb->device, "%s: Finalised property cache\n",
1848                                 __func__);
1849
1850                 r = dtv_set_frontend(fe);
1851                 break;
1852         case DTV_FREQUENCY:
1853                 c->frequency = tvp->u.data;
1854                 break;
1855         case DTV_MODULATION:
1856                 c->modulation = tvp->u.data;
1857                 break;
1858         case DTV_BANDWIDTH_HZ:
1859                 c->bandwidth_hz = tvp->u.data;
1860                 break;
1861         case DTV_INVERSION:
1862                 c->inversion = tvp->u.data;
1863                 break;
1864         case DTV_SYMBOL_RATE:
1865                 c->symbol_rate = tvp->u.data;
1866                 break;
1867         case DTV_INNER_FEC:
1868                 c->fec_inner = tvp->u.data;
1869                 break;
1870         case DTV_PILOT:
1871                 c->pilot = tvp->u.data;
1872                 break;
1873         case DTV_ROLLOFF:
1874                 c->rolloff = tvp->u.data;
1875                 break;
1876         case DTV_DELIVERY_SYSTEM:
1877                 r = dvbv5_set_delivery_system(fe, tvp->u.data);
1878                 break;
1879         case DTV_VOLTAGE:
1880                 c->voltage = tvp->u.data;
1881                 r = dvb_frontend_ioctl_legacy(file, FE_SET_VOLTAGE,
1882                         (void *)c->voltage);
1883                 break;
1884         case DTV_TONE:
1885                 c->sectone = tvp->u.data;
1886                 r = dvb_frontend_ioctl_legacy(file, FE_SET_TONE,
1887                         (void *)c->sectone);
1888                 break;
1889         case DTV_CODE_RATE_HP:
1890                 c->code_rate_HP = tvp->u.data;
1891                 break;
1892         case DTV_CODE_RATE_LP:
1893                 c->code_rate_LP = tvp->u.data;
1894                 break;
1895         case DTV_GUARD_INTERVAL:
1896                 c->guard_interval = tvp->u.data;
1897                 break;
1898         case DTV_TRANSMISSION_MODE:
1899                 c->transmission_mode = tvp->u.data;
1900                 break;
1901         case DTV_HIERARCHY:
1902                 c->hierarchy = tvp->u.data;
1903                 break;
1904         case DTV_INTERLEAVING:
1905                 c->interleaving = tvp->u.data;
1906                 break;
1907
1908         /* ISDB-T Support here */
1909         case DTV_ISDBT_PARTIAL_RECEPTION:
1910                 c->isdbt_partial_reception = tvp->u.data;
1911                 break;
1912         case DTV_ISDBT_SOUND_BROADCASTING:
1913                 c->isdbt_sb_mode = tvp->u.data;
1914                 break;
1915         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1916                 c->isdbt_sb_subchannel = tvp->u.data;
1917                 break;
1918         case DTV_ISDBT_SB_SEGMENT_IDX:
1919                 c->isdbt_sb_segment_idx = tvp->u.data;
1920                 break;
1921         case DTV_ISDBT_SB_SEGMENT_COUNT:
1922                 c->isdbt_sb_segment_count = tvp->u.data;
1923                 break;
1924         case DTV_ISDBT_LAYER_ENABLED:
1925                 c->isdbt_layer_enabled = tvp->u.data;
1926                 break;
1927         case DTV_ISDBT_LAYERA_FEC:
1928                 c->layer[0].fec = tvp->u.data;
1929                 break;
1930         case DTV_ISDBT_LAYERA_MODULATION:
1931                 c->layer[0].modulation = tvp->u.data;
1932                 break;
1933         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1934                 c->layer[0].segment_count = tvp->u.data;
1935                 break;
1936         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1937                 c->layer[0].interleaving = tvp->u.data;
1938                 break;
1939         case DTV_ISDBT_LAYERB_FEC:
1940                 c->layer[1].fec = tvp->u.data;
1941                 break;
1942         case DTV_ISDBT_LAYERB_MODULATION:
1943                 c->layer[1].modulation = tvp->u.data;
1944                 break;
1945         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1946                 c->layer[1].segment_count = tvp->u.data;
1947                 break;
1948         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1949                 c->layer[1].interleaving = tvp->u.data;
1950                 break;
1951         case DTV_ISDBT_LAYERC_FEC:
1952                 c->layer[2].fec = tvp->u.data;
1953                 break;
1954         case DTV_ISDBT_LAYERC_MODULATION:
1955                 c->layer[2].modulation = tvp->u.data;
1956                 break;
1957         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1958                 c->layer[2].segment_count = tvp->u.data;
1959                 break;
1960         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1961                 c->layer[2].interleaving = tvp->u.data;
1962                 break;
1963
1964         /* Multistream support */
1965         case DTV_STREAM_ID:
1966         case DTV_DVBT2_PLP_ID_LEGACY:
1967                 c->stream_id = tvp->u.data;
1968                 break;
1969
1970         /* ATSC-MH */
1971         case DTV_ATSCMH_PARADE_ID:
1972                 fe->dtv_property_cache.atscmh_parade_id = tvp->u.data;
1973                 break;
1974         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1975                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = tvp->u.data;
1976                 break;
1977
1978         case DTV_LNA:
1979                 c->lna = tvp->u.data;
1980                 if (fe->ops.set_lna)
1981                         r = fe->ops.set_lna(fe);
1982                 if (r < 0)
1983                         c->lna = LNA_AUTO;
1984                 break;
1985
1986         default:
1987                 return -EINVAL;
1988         }
1989
1990         return r;
1991 }
1992
1993 static int dvb_frontend_ioctl(struct file *file,
1994                         unsigned int cmd, void *parg)
1995 {
1996         struct dvb_device *dvbdev = file->private_data;
1997         struct dvb_frontend *fe = dvbdev->priv;
1998         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1999         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2000         int err = -EOPNOTSUPP;
2001
2002         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2003         if (down_interruptible(&fepriv->sem))
2004                 return -ERESTARTSYS;
2005
2006         if (fe->exit != DVB_FE_NO_EXIT) {
2007                 up(&fepriv->sem);
2008                 return -ENODEV;
2009         }
2010
2011         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
2012             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
2013              cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2014                 up(&fepriv->sem);
2015                 return -EPERM;
2016         }
2017
2018         if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
2019                 err = dvb_frontend_ioctl_properties(file, cmd, parg);
2020         else {
2021                 c->state = DTV_UNDEFINED;
2022                 err = dvb_frontend_ioctl_legacy(file, cmd, parg);
2023         }
2024
2025         up(&fepriv->sem);
2026         return err;
2027 }
2028
2029 static int dvb_frontend_ioctl_properties(struct file *file,
2030                         unsigned int cmd, void *parg)
2031 {
2032         struct dvb_device *dvbdev = file->private_data;
2033         struct dvb_frontend *fe = dvbdev->priv;
2034         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2035         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2036         int err = 0;
2037
2038         struct dtv_properties *tvps = parg;
2039         struct dtv_property *tvp = NULL;
2040         int i;
2041
2042         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2043
2044         if (cmd == FE_SET_PROPERTY) {
2045                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2046                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2047
2048                 /* Put an arbitrary limit on the number of messages that can
2049                  * be sent at once */
2050                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2051                         return -EINVAL;
2052
2053                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
2054                 if (!tvp) {
2055                         err = -ENOMEM;
2056                         goto out;
2057                 }
2058
2059                 if (copy_from_user(tvp, (void __user *)tvps->props,
2060                                    tvps->num * sizeof(struct dtv_property))) {
2061                         err = -EFAULT;
2062                         goto out;
2063                 }
2064
2065                 for (i = 0; i < tvps->num; i++) {
2066                         err = dtv_property_process_set(fe, tvp + i, file);
2067                         if (err < 0)
2068                                 goto out;
2069                         (tvp + i)->result = err;
2070                 }
2071
2072                 if (c->state == DTV_TUNE)
2073                         dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
2074
2075         } else if (cmd == FE_GET_PROPERTY) {
2076                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2077                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2078
2079                 /* Put an arbitrary limit on the number of messages that can
2080                  * be sent at once */
2081                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2082                         return -EINVAL;
2083
2084                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
2085                 if (!tvp) {
2086                         err = -ENOMEM;
2087                         goto out;
2088                 }
2089
2090                 if (copy_from_user(tvp, (void __user *)tvps->props,
2091                                    tvps->num * sizeof(struct dtv_property))) {
2092                         err = -EFAULT;
2093                         goto out;
2094                 }
2095
2096                 /*
2097                  * Fills the cache out struct with the cache contents, plus
2098                  * the data retrieved from get_frontend, if the frontend
2099                  * is not idle. Otherwise, returns the cached content
2100                  */
2101                 if (fepriv->state != FESTATE_IDLE) {
2102                         err = dtv_get_frontend(fe, NULL);
2103                         if (err < 0)
2104                                 goto out;
2105                 }
2106                 for (i = 0; i < tvps->num; i++) {
2107                         err = dtv_property_process_get(fe, c, tvp + i, file);
2108                         if (err < 0)
2109                                 goto out;
2110                         (tvp + i)->result = err;
2111                 }
2112
2113                 if (copy_to_user((void __user *)tvps->props, tvp,
2114                                  tvps->num * sizeof(struct dtv_property))) {
2115                         err = -EFAULT;
2116                         goto out;
2117                 }
2118
2119         } else
2120                 err = -EOPNOTSUPP;
2121
2122 out:
2123         kfree(tvp);
2124         return err;
2125 }
2126
2127 static int dtv_set_frontend(struct dvb_frontend *fe)
2128 {
2129         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2130         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2131         struct dvb_frontend_tune_settings fetunesettings;
2132         u32 rolloff = 0;
2133
2134         if (dvb_frontend_check_parameters(fe) < 0)
2135                 return -EINVAL;
2136
2137         /*
2138          * Initialize output parameters to match the values given by
2139          * the user. FE_SET_FRONTEND triggers an initial frontend event
2140          * with status = 0, which copies output parameters to userspace.
2141          */
2142         dtv_property_legacy_params_sync(fe, &fepriv->parameters_out);
2143
2144         /*
2145          * Be sure that the bandwidth will be filled for all
2146          * non-satellite systems, as tuners need to know what
2147          * low pass/Nyquist half filter should be applied, in
2148          * order to avoid inter-channel noise.
2149          *
2150          * ISDB-T and DVB-T/T2 already sets bandwidth.
2151          * ATSC and DVB-C don't set, so, the core should fill it.
2152          *
2153          * On DVB-C Annex A and C, the bandwidth is a function of
2154          * the roll-off and symbol rate. Annex B defines different
2155          * roll-off factors depending on the modulation. Fortunately,
2156          * Annex B is only used with 6MHz, so there's no need to
2157          * calculate it.
2158          *
2159          * While not officially supported, a side effect of handling it at
2160          * the cache level is that a program could retrieve the bandwidth
2161          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2162          */
2163         switch (c->delivery_system) {
2164         case SYS_ATSC:
2165         case SYS_DVBC_ANNEX_B:
2166                 c->bandwidth_hz = 6000000;
2167                 break;
2168         case SYS_DVBC_ANNEX_A:
2169                 rolloff = 115;
2170                 break;
2171         case SYS_DVBC_ANNEX_C:
2172                 rolloff = 113;
2173                 break;
2174         case SYS_DVBS:
2175         case SYS_TURBO:
2176         case SYS_ISDBS:
2177                 rolloff = 135;
2178                 break;
2179         case SYS_DVBS2:
2180                 switch (c->rolloff) {
2181                 case ROLLOFF_20:
2182                         rolloff = 120;
2183                         break;
2184                 case ROLLOFF_25:
2185                         rolloff = 125;
2186                         break;
2187                 default:
2188                 case ROLLOFF_35:
2189                         rolloff = 135;
2190                 }
2191                 break;
2192         default:
2193                 break;
2194         }
2195         if (rolloff)
2196                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2197
2198         /* force auto frequency inversion if requested */
2199         if (dvb_force_auto_inversion)
2200                 c->inversion = INVERSION_AUTO;
2201
2202         /*
2203          * without hierarchical coding code_rate_LP is irrelevant,
2204          * so we tolerate the otherwise invalid FEC_NONE setting
2205          */
2206         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2207                 c->code_rate_LP = FEC_AUTO;
2208
2209         /* get frontend-specific tuning settings */
2210         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2211         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2212                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2213                 fepriv->max_drift = fetunesettings.max_drift;
2214                 fepriv->step_size = fetunesettings.step_size;
2215         } else {
2216                 /* default values */
2217                 switch (c->delivery_system) {
2218                 case SYS_DVBS:
2219                 case SYS_DVBS2:
2220                 case SYS_ISDBS:
2221                 case SYS_TURBO:
2222                 case SYS_DVBC_ANNEX_A:
2223                 case SYS_DVBC_ANNEX_C:
2224                         fepriv->min_delay = HZ / 20;
2225                         fepriv->step_size = c->symbol_rate / 16000;
2226                         fepriv->max_drift = c->symbol_rate / 2000;
2227                         break;
2228                 case SYS_DVBT:
2229                 case SYS_DVBT2:
2230                 case SYS_ISDBT:
2231                 case SYS_DTMB:
2232                         fepriv->min_delay = HZ / 20;
2233                         fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
2234                         fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
2235                         break;
2236                 default:
2237                         /*
2238                          * FIXME: This sounds wrong! if freqency_stepsize is
2239                          * defined by the frontend, why not use it???
2240                          */
2241                         fepriv->min_delay = HZ / 20;
2242                         fepriv->step_size = 0; /* no zigzag */
2243                         fepriv->max_drift = 0;
2244                         break;
2245                 }
2246         }
2247         if (dvb_override_tune_delay > 0)
2248                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2249
2250         fepriv->state = FESTATE_RETUNE;
2251
2252         /* Request the search algorithm to search */
2253         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2254
2255         dvb_frontend_clear_events(fe);
2256         dvb_frontend_add_event(fe, 0);
2257         dvb_frontend_wakeup(fe);
2258         fepriv->status = 0;
2259
2260         return 0;
2261 }
2262
2263
2264 static int dvb_frontend_ioctl_legacy(struct file *file,
2265                         unsigned int cmd, void *parg)
2266 {
2267         struct dvb_device *dvbdev = file->private_data;
2268         struct dvb_frontend *fe = dvbdev->priv;
2269         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2270         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2271         int err = -EOPNOTSUPP;
2272
2273         switch (cmd) {
2274         case FE_GET_INFO: {
2275                 struct dvb_frontend_info* info = parg;
2276
2277                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
2278                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);
2279
2280                 /*
2281                  * Associate the 4 delivery systems supported by DVBv3
2282                  * API with their DVBv5 counterpart. For the other standards,
2283                  * use the closest type, assuming that it would hopefully
2284                  * work with a DVBv3 application.
2285                  * It should be noticed that, on multi-frontend devices with
2286                  * different types (terrestrial and cable, for example),
2287                  * a pure DVBv3 application won't be able to use all delivery
2288                  * systems. Yet, changing the DVBv5 cache to the other delivery
2289                  * system should be enough for making it work.
2290                  */
2291                 switch (dvbv3_type(c->delivery_system)) {
2292                 case DVBV3_QPSK:
2293                         info->type = FE_QPSK;
2294                         break;
2295                 case DVBV3_ATSC:
2296                         info->type = FE_ATSC;
2297                         break;
2298                 case DVBV3_QAM:
2299                         info->type = FE_QAM;
2300                         break;
2301                 case DVBV3_OFDM:
2302                         info->type = FE_OFDM;
2303                         break;
2304                 default:
2305                         dev_err(fe->dvb->device,
2306                                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2307                                         __func__, c->delivery_system);
2308                         fe->ops.info.type = FE_OFDM;
2309                 }
2310                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2311                                  __func__, c->delivery_system, fe->ops.info.type);
2312
2313                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2314                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2315                         info->caps |= FE_CAN_INVERSION_AUTO;
2316                 err = 0;
2317                 break;
2318         }
2319
2320         case FE_READ_STATUS: {
2321                 enum fe_status *status = parg;
2322
2323                 /* if retune was requested but hasn't occurred yet, prevent
2324                  * that user get signal state from previous tuning */
2325                 if (fepriv->state == FESTATE_RETUNE ||
2326                     fepriv->state == FESTATE_ERROR) {
2327                         err=0;
2328                         *status = 0;
2329                         break;
2330                 }
2331
2332                 if (fe->ops.read_status)
2333                         err = fe->ops.read_status(fe, status);
2334                 break;
2335         }
2336
2337         case FE_READ_BER:
2338                 if (fe->ops.read_ber) {
2339                         if (fepriv->thread)
2340                                 err = fe->ops.read_ber(fe, (__u32 *) parg);
2341                         else
2342                                 err = -EAGAIN;
2343                 }
2344                 break;
2345
2346         case FE_READ_SIGNAL_STRENGTH:
2347                 if (fe->ops.read_signal_strength) {
2348                         if (fepriv->thread)
2349                                 err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
2350                         else
2351                                 err = -EAGAIN;
2352                 }
2353                 break;
2354
2355         case FE_READ_SNR:
2356                 if (fe->ops.read_snr) {
2357                         if (fepriv->thread)
2358                                 err = fe->ops.read_snr(fe, (__u16 *) parg);
2359                         else
2360                                 err = -EAGAIN;
2361                 }
2362                 break;
2363
2364         case FE_READ_UNCORRECTED_BLOCKS:
2365                 if (fe->ops.read_ucblocks) {
2366                         if (fepriv->thread)
2367                                 err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
2368                         else
2369                                 err = -EAGAIN;
2370                 }
2371                 break;
2372
2373         case FE_DISEQC_RESET_OVERLOAD:
2374                 if (fe->ops.diseqc_reset_overload) {
2375                         err = fe->ops.diseqc_reset_overload(fe);
2376                         fepriv->state = FESTATE_DISEQC;
2377                         fepriv->status = 0;
2378                 }
2379                 break;
2380
2381         case FE_DISEQC_SEND_MASTER_CMD:
2382                 if (fe->ops.diseqc_send_master_cmd) {
2383                         struct dvb_diseqc_master_cmd *cmd = parg;
2384
2385                         if (cmd->msg_len > sizeof(cmd->msg)) {
2386                                 err = -EINVAL;
2387                                 break;
2388                         }
2389                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2390                         fepriv->state = FESTATE_DISEQC;
2391                         fepriv->status = 0;
2392                 }
2393                 break;
2394
2395         case FE_DISEQC_SEND_BURST:
2396                 if (fe->ops.diseqc_send_burst) {
2397                         err = fe->ops.diseqc_send_burst(fe,
2398                                                 (enum fe_sec_mini_cmd)parg);
2399                         fepriv->state = FESTATE_DISEQC;
2400                         fepriv->status = 0;
2401                 }
2402                 break;
2403
2404         case FE_SET_TONE:
2405                 if (fe->ops.set_tone) {
2406                         err = fe->ops.set_tone(fe,
2407                                                (enum fe_sec_tone_mode)parg);
2408                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2409                         fepriv->state = FESTATE_DISEQC;
2410                         fepriv->status = 0;
2411                 }
2412                 break;
2413
2414         case FE_SET_VOLTAGE:
2415                 if (fe->ops.set_voltage) {
2416                         err = fe->ops.set_voltage(fe,
2417                                                   (enum fe_sec_voltage)parg);
2418                         fepriv->voltage = (enum fe_sec_voltage)parg;
2419                         fepriv->state = FESTATE_DISEQC;
2420                         fepriv->status = 0;
2421                 }
2422                 break;
2423
2424         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2425                 if (fe->ops.dishnetwork_send_legacy_command) {
2426                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2427                                                          (unsigned long)parg);
2428                         fepriv->state = FESTATE_DISEQC;
2429                         fepriv->status = 0;
2430                 } else if (fe->ops.set_voltage) {
2431                         /*
2432                          * NOTE: This is a fallback condition.  Some frontends
2433                          * (stv0299 for instance) take longer than 8msec to
2434                          * respond to a set_voltage command.  Those switches
2435                          * need custom routines to switch properly.  For all
2436                          * other frontends, the following should work ok.
2437                          * Dish network legacy switches (as used by Dish500)
2438                          * are controlled by sending 9-bit command words
2439                          * spaced 8msec apart.
2440                          * the actual command word is switch/port dependent
2441                          * so it is up to the userspace application to send
2442                          * the right command.
2443                          * The command must always start with a '0' after
2444                          * initialization, so parg is 8 bits and does not
2445                          * include the initialization or start bit
2446                          */
2447                         unsigned long swcmd = ((unsigned long) parg) << 1;
2448                         ktime_t nexttime;
2449                         ktime_t tv[10];
2450                         int i;
2451                         u8 last = 1;
2452                         if (dvb_frontend_debug)
2453                                 printk("%s switch command: 0x%04lx\n", __func__, swcmd);
2454                         nexttime = ktime_get_real();
2455                         if (dvb_frontend_debug)
2456                                 tv[0] = nexttime;
2457                         /* before sending a command, initialize by sending
2458                          * a 32ms 18V to the switch
2459                          */
2460                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2461                         dvb_frontend_sleep_until(&nexttime, 32000);
2462
2463                         for (i = 0; i < 9; i++) {
2464                                 if (dvb_frontend_debug)
2465                                         tv[i+1] = ktime_get_real();
2466                                 if ((swcmd & 0x01) != last) {
2467                                         /* set voltage to (last ? 13V : 18V) */
2468                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2469                                         last = (last) ? 0 : 1;
2470                                 }
2471                                 swcmd = swcmd >> 1;
2472                                 if (i != 8)
2473                                         dvb_frontend_sleep_until(&nexttime, 8000);
2474                         }
2475                         if (dvb_frontend_debug) {
2476                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
2477                                         __func__, fe->dvb->num);
2478                                 for (i = 1; i < 10; i++)
2479                                         printk("%d: %d\n", i,
2480                                         (int) ktime_us_delta(tv[i], tv[i-1]));
2481                         }
2482                         err = 0;
2483                         fepriv->state = FESTATE_DISEQC;
2484                         fepriv->status = 0;
2485                 }
2486                 break;
2487
2488         case FE_DISEQC_RECV_SLAVE_REPLY:
2489                 if (fe->ops.diseqc_recv_slave_reply)
2490                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
2491                 break;
2492
2493         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2494                 if (fe->ops.enable_high_lnb_voltage)
2495                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
2496                 break;
2497
2498         case FE_SET_FRONTEND:
2499                 err = dvbv3_set_delivery_system(fe);
2500                 if (err)
2501                         break;
2502
2503                 err = dtv_property_cache_sync(fe, c, parg);
2504                 if (err)
2505                         break;
2506                 err = dtv_set_frontend(fe);
2507                 break;
2508         case FE_GET_EVENT:
2509                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
2510                 break;
2511
2512         case FE_GET_FRONTEND:
2513                 err = dtv_get_frontend(fe, parg);
2514                 break;
2515
2516         case FE_SET_FRONTEND_TUNE_MODE:
2517                 fepriv->tune_mode_flags = (unsigned long) parg;
2518                 err = 0;
2519                 break;
2520         }
2521
2522         return err;
2523 }
2524
2525
2526 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2527 {
2528         struct dvb_device *dvbdev = file->private_data;
2529         struct dvb_frontend *fe = dvbdev->priv;
2530         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2531
2532         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2533
2534         poll_wait (file, &fepriv->events.wait_queue, wait);
2535
2536         if (fepriv->events.eventw != fepriv->events.eventr)
2537                 return (POLLIN | POLLRDNORM | POLLPRI);
2538
2539         return 0;
2540 }
2541
2542 static int dvb_frontend_open(struct inode *inode, struct file *file)
2543 {
2544         struct dvb_device *dvbdev = file->private_data;
2545         struct dvb_frontend *fe = dvbdev->priv;
2546         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2547         struct dvb_adapter *adapter = fe->dvb;
2548         int ret;
2549
2550         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2551         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2552                 return -ENODEV;
2553
2554         if (adapter->mfe_shared) {
2555                 mutex_lock (&adapter->mfe_lock);
2556
2557                 if (adapter->mfe_dvbdev == NULL)
2558                         adapter->mfe_dvbdev = dvbdev;
2559
2560                 else if (adapter->mfe_dvbdev != dvbdev) {
2561                         struct dvb_device
2562                                 *mfedev = adapter->mfe_dvbdev;
2563                         struct dvb_frontend
2564                                 *mfe = mfedev->priv;
2565                         struct dvb_frontend_private
2566                                 *mfepriv = mfe->frontend_priv;
2567                         int mferetry = (dvb_mfe_wait_time << 1);
2568
2569                         mutex_unlock (&adapter->mfe_lock);
2570                         while (mferetry-- && (mfedev->users != -1 ||
2571                                         mfepriv->thread != NULL)) {
2572                                 if(msleep_interruptible(500)) {
2573                                         if(signal_pending(current))
2574                                                 return -EINTR;
2575                                 }
2576                         }
2577
2578                         mutex_lock (&adapter->mfe_lock);
2579                         if(adapter->mfe_dvbdev != dvbdev) {
2580                                 mfedev = adapter->mfe_dvbdev;
2581                                 mfe = mfedev->priv;
2582                                 mfepriv = mfe->frontend_priv;
2583                                 if (mfedev->users != -1 ||
2584                                                 mfepriv->thread != NULL) {
2585                                         mutex_unlock (&adapter->mfe_lock);
2586                                         return -EBUSY;
2587                                 }
2588                                 adapter->mfe_dvbdev = dvbdev;
2589                         }
2590                 }
2591         }
2592
2593         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2594                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2595                         goto err0;
2596
2597                 /* If we took control of the bus, we need to force
2598                    reinitialization.  This is because many ts_bus_ctrl()
2599                    functions strobe the RESET pin on the demod, and if the
2600                    frontend thread already exists then the dvb_init() routine
2601                    won't get called (which is what usually does initial
2602                    register configuration). */
2603                 fepriv->reinitialise = 1;
2604         }
2605
2606         if ((ret = dvb_generic_open (inode, file)) < 0)
2607                 goto err1;
2608
2609         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2610                 /* normal tune mode when opened R/W */
2611                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2612                 fepriv->tone = -1;
2613                 fepriv->voltage = -1;
2614
2615                 ret = dvb_frontend_start (fe);
2616                 if (ret)
2617                         goto err2;
2618
2619                 /*  empty event queue */
2620                 fepriv->events.eventr = fepriv->events.eventw = 0;
2621         }
2622
2623         if (adapter->mfe_shared)
2624                 mutex_unlock (&adapter->mfe_lock);
2625         return ret;
2626
2627 err2:
2628         dvb_generic_release(inode, file);
2629 err1:
2630         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2631                 fe->ops.ts_bus_ctrl(fe, 0);
2632 err0:
2633         if (adapter->mfe_shared)
2634                 mutex_unlock (&adapter->mfe_lock);
2635         return ret;
2636 }
2637
2638 static int dvb_frontend_release(struct inode *inode, struct file *file)
2639 {
2640         struct dvb_device *dvbdev = file->private_data;
2641         struct dvb_frontend *fe = dvbdev->priv;
2642         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2643         int ret;
2644
2645         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2646
2647         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2648                 fepriv->release_jiffies = jiffies;
2649                 mb();
2650         }
2651
2652         ret = dvb_generic_release (inode, file);
2653
2654         if (dvbdev->users == -1) {
2655                 wake_up(&fepriv->wait_queue);
2656                 if (fe->exit != DVB_FE_NO_EXIT)
2657                         wake_up(&dvbdev->wait_queue);
2658                 if (fe->ops.ts_bus_ctrl)
2659                         fe->ops.ts_bus_ctrl(fe, 0);
2660         }
2661
2662         return ret;
2663 }
2664
2665 static const struct file_operations dvb_frontend_fops = {
2666         .owner          = THIS_MODULE,
2667         .unlocked_ioctl = dvb_generic_ioctl,
2668         .poll           = dvb_frontend_poll,
2669         .open           = dvb_frontend_open,
2670         .release        = dvb_frontend_release,
2671         .llseek         = noop_llseek,
2672 };
2673
2674 int dvb_frontend_suspend(struct dvb_frontend *fe)
2675 {
2676         int ret = 0;
2677
2678         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2679                         fe->id);
2680
2681         if (fe->ops.tuner_ops.suspend)
2682                 ret = fe->ops.tuner_ops.suspend(fe);
2683         else if (fe->ops.tuner_ops.sleep)
2684                 ret = fe->ops.tuner_ops.sleep(fe);
2685
2686         if (fe->ops.sleep)
2687                 ret = fe->ops.sleep(fe);
2688
2689         return ret;
2690 }
2691 EXPORT_SYMBOL(dvb_frontend_suspend);
2692
2693 int dvb_frontend_resume(struct dvb_frontend *fe)
2694 {
2695         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2696         int ret = 0;
2697
2698         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2699                         fe->id);
2700
2701         fe->exit = DVB_FE_DEVICE_RESUME;
2702         if (fe->ops.init)
2703                 ret = fe->ops.init(fe);
2704
2705         if (fe->ops.tuner_ops.resume)
2706                 ret = fe->ops.tuner_ops.resume(fe);
2707         else if (fe->ops.tuner_ops.init)
2708                 ret = fe->ops.tuner_ops.init(fe);
2709
2710         if (fe->ops.set_tone && fepriv->tone != -1)
2711                 fe->ops.set_tone(fe, fepriv->tone);
2712         if (fe->ops.set_voltage && fepriv->voltage != -1)
2713                 fe->ops.set_voltage(fe, fepriv->voltage);
2714
2715         fe->exit = DVB_FE_NO_EXIT;
2716         fepriv->state = FESTATE_RETUNE;
2717         dvb_frontend_wakeup(fe);
2718
2719         return ret;
2720 }
2721 EXPORT_SYMBOL(dvb_frontend_resume);
2722
2723 int dvb_register_frontend(struct dvb_adapter* dvb,
2724                           struct dvb_frontend* fe)
2725 {
2726         struct dvb_frontend_private *fepriv;
2727         const struct dvb_device dvbdev_template = {
2728                 .users = ~0,
2729                 .writers = 1,
2730                 .readers = (~0)-1,
2731                 .fops = &dvb_frontend_fops,
2732 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2733                 .name = fe->ops.info.name,
2734 #endif
2735                 .kernel_ioctl = dvb_frontend_ioctl
2736         };
2737
2738         dev_dbg(dvb->device, "%s:\n", __func__);
2739
2740         if (mutex_lock_interruptible(&frontend_mutex))
2741                 return -ERESTARTSYS;
2742
2743         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2744         if (fe->frontend_priv == NULL) {
2745                 mutex_unlock(&frontend_mutex);
2746                 return -ENOMEM;
2747         }
2748         fepriv = fe->frontend_priv;
2749
2750         sema_init(&fepriv->sem, 1);
2751         init_waitqueue_head (&fepriv->wait_queue);
2752         init_waitqueue_head (&fepriv->events.wait_queue);
2753         mutex_init(&fepriv->events.mtx);
2754         fe->dvb = dvb;
2755         fepriv->inversion = INVERSION_OFF;
2756
2757         dev_info(fe->dvb->device,
2758                         "DVB: registering adapter %i frontend %i (%s)...\n",
2759                         fe->dvb->num, fe->id, fe->ops.info.name);
2760
2761         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2762                              fe, DVB_DEVICE_FRONTEND, 0);
2763
2764         /*
2765          * Initialize the cache to the proper values according with the
2766          * first supported delivery system (ops->delsys[0])
2767          */
2768
2769         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
2770         dvb_frontend_clear_cache(fe);
2771
2772         mutex_unlock(&frontend_mutex);
2773         return 0;
2774 }
2775 EXPORT_SYMBOL(dvb_register_frontend);
2776
2777 int dvb_unregister_frontend(struct dvb_frontend* fe)
2778 {
2779         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2780         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2781
2782         mutex_lock(&frontend_mutex);
2783         dvb_frontend_stop (fe);
2784         mutex_unlock(&frontend_mutex);
2785
2786         if (fepriv->dvbdev->users < -1)
2787                 wait_event(fepriv->dvbdev->wait_queue,
2788                                 fepriv->dvbdev->users==-1);
2789
2790         mutex_lock(&frontend_mutex);
2791         dvb_unregister_device (fepriv->dvbdev);
2792
2793         /* fe is invalid now */
2794         kfree(fepriv);
2795         mutex_unlock(&frontend_mutex);
2796         return 0;
2797 }
2798 EXPORT_SYMBOL(dvb_unregister_frontend);
2799
2800 #ifdef CONFIG_MEDIA_ATTACH
2801 void dvb_frontend_detach(struct dvb_frontend* fe)
2802 {
2803         void *ptr;
2804
2805         if (fe->ops.release_sec) {
2806                 fe->ops.release_sec(fe);
2807                 dvb_detach(fe->ops.release_sec);
2808         }
2809         if (fe->ops.tuner_ops.release) {
2810                 fe->ops.tuner_ops.release(fe);
2811                 dvb_detach(fe->ops.tuner_ops.release);
2812         }
2813         if (fe->ops.analog_ops.release) {
2814                 fe->ops.analog_ops.release(fe);
2815                 dvb_detach(fe->ops.analog_ops.release);
2816         }
2817         ptr = (void*)fe->ops.release;
2818         if (ptr) {
2819                 fe->ops.release(fe);
2820                 dvb_detach(ptr);
2821         }
2822 }
2823 #else
2824 void dvb_frontend_detach(struct dvb_frontend* fe)
2825 {
2826         if (fe->ops.release_sec)
2827                 fe->ops.release_sec(fe);
2828         if (fe->ops.tuner_ops.release)
2829                 fe->ops.tuner_ops.release(fe);
2830         if (fe->ops.analog_ops.release)
2831                 fe->ops.analog_ops.release(fe);
2832         if (fe->ops.release)
2833                 fe->ops.release(fe);
2834 }
2835 #endif
2836 EXPORT_SYMBOL(dvb_frontend_detach);