drivers/media/dvb-core/dvb_frontend.c

   1 /*
   2  * dvb_frontend.c: DVB frontend tuning interface/thread
   3  *
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  * To obtain the license, point your browser to
  22  * http://www.gnu.org/copyleft/gpl.html
  23  */
  24
  25 /* Enables DVBv3 compatibility bits at the headers */
  26 #define __DVB_CORE__
  27
  28 #define pr_fmt(fmt) "dvb_frontend: " fmt
  29
  30 #include <linux/string.h>
  31 #include <linux/kernel.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/wait.h>
  34 #include <linux/slab.h>
  35 #include <linux/poll.h>
  36 #include <linux/semaphore.h>
  37 #include <linux/module.h>
  38 #include <linux/list.h>
  39 #include <linux/freezer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kthread.h>
  42 #include <linux/ktime.h>
  43 #include <asm/processor.h>
  44
  45 #include "dvb_frontend.h"
  46 #include "dvbdev.h"
  47 #include <linux/dvb/version.h>
  48
  49 static int dvb_frontend_debug;
  50 static int dvb_shutdown_timeout;
  51 static int dvb_force_auto_inversion;
  52 static int dvb_override_tune_delay;
  53 static int dvb_powerdown_on_sleep = 1;
  54 static int dvb_mfe_wait_time = 5;
  55
  56 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  57 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  58 module_param(dvb_shutdown_timeout, int, 0644);
  59 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  60 module_param(dvb_force_auto_inversion, int, 0644);
  61 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  62 module_param(dvb_override_tune_delay, int, 0644);
  63 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  64 module_param(dvb_powerdown_on_sleep, int, 0644);
  65 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  66 module_param(dvb_mfe_wait_time, int, 0644);
  67 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  68
  69 #define dprintk(fmt, arg...) \
  70         printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
  71
  72 #define FESTATE_IDLE 1
  73 #define FESTATE_RETUNE 2
  74 #define FESTATE_TUNING_FAST 4
  75 #define FESTATE_TUNING_SLOW 8
  76 #define FESTATE_TUNED 16
  77 #define FESTATE_ZIGZAG_FAST 32
  78 #define FESTATE_ZIGZAG_SLOW 64
  79 #define FESTATE_DISEQC 128
  80 #define FESTATE_ERROR 256
  81 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  82 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  83 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  84 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  85
  86 /*
  87  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  88  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  89  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  90  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  91  * FESTATE_TUNED. The frontend has successfully locked on.
  92  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  93  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  94  * FESTATE_DISEQC. A DISEQC command has just been issued.
  95  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  96  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  97  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  98  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  99  */
 100
 101 static DEFINE_MUTEX(frontend_mutex);
 102
 103 struct dvb_frontend_private {
 104         /* thread/frontend values */
 105         struct dvb_device *dvbdev;
 106         struct dvb_frontend_parameters parameters_out;
 107         struct dvb_fe_events events;
 108         struct semaphore sem;
 109         struct list_head list_head;
 110         wait_queue_head_t wait_queue;
 111         struct task_struct *thread;
 112         unsigned long release_jiffies;
 113         unsigned int wakeup;
 114         enum fe_status status;
 115         unsigned long tune_mode_flags;
 116         unsigned int delay;
 117         unsigned int reinitialise;
 118         int tone;
 119         int voltage;
 120
 121         /* swzigzag values */
 122         unsigned int state;
 123         unsigned int bending;
 124         int lnb_drift;
 125         unsigned int inversion;
 126         unsigned int auto_step;
 127         unsigned int auto_sub_step;
 128         unsigned int started_auto_step;
 129         unsigned int min_delay;
 130         unsigned int max_drift;
 131         unsigned int step_size;
 132         int quality;
 133         unsigned int check_wrapped;
 134         enum dvbfe_search algo_status;
 135
 136 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 137         struct media_pipeline pipe;
 138 #endif
 139 };
 140
 141 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
 142                                         void (*release)(struct dvb_frontend *fe));
 143
 144 static void __dvb_frontend_free(struct dvb_frontend *fe)
 145 {
 146         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 147
 148         if (fepriv)
 149                 dvb_free_device(fepriv->dvbdev);
 150
 151         dvb_frontend_invoke_release(fe, fe->ops.release);
 152
 153         if (fepriv)
 154                 kfree(fepriv);
 155 }
 156
 157 static void dvb_frontend_free(struct kref *ref)
 158 {
 159         struct dvb_frontend *fe =
 160                 container_of(ref, struct dvb_frontend, refcount);
 161
 162         __dvb_frontend_free(fe);
 163 }
 164
 165 static void dvb_frontend_put(struct dvb_frontend *fe)
 166 {
 167         /*
 168          * Check if the frontend was registered, as otherwise
 169          * kref was not initialized yet.
 170          */
 171         if (fe->frontend_priv)
 172                 kref_put(&fe->refcount, dvb_frontend_free);
 173         else
 174                 __dvb_frontend_free(fe);
 175 }
 176
 177 static void dvb_frontend_get(struct dvb_frontend *fe)
 178 {
 179         kref_get(&fe->refcount);
 180 }
 181
 182 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 183 static int dtv_get_frontend(struct dvb_frontend *fe,
 184                             struct dtv_frontend_properties *c,
 185                             struct dvb_frontend_parameters *p_out);
 186 static int
 187 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 188                                 const struct dtv_frontend_properties *c,
 189                                 struct dvb_frontend_parameters *p);
 190
 191 static bool has_get_frontend(struct dvb_frontend *fe)
 192 {
 193         return fe->ops.get_frontend != NULL;
 194 }
 195
 196 /*
 197  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 198  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 199  * otherwise, a DVBv3 call will fail.
 200  */
 201 enum dvbv3_emulation_type {
 202         DVBV3_UNKNOWN,
 203         DVBV3_QPSK,
 204         DVBV3_QAM,
 205         DVBV3_OFDM,
 206         DVBV3_ATSC,
 207 };
 208
 209 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 210 {
 211         switch (delivery_system) {
 212         case SYS_DVBC_ANNEX_A:
 213         case SYS_DVBC_ANNEX_C:
 214                 return DVBV3_QAM;
 215         case SYS_DVBS:
 216         case SYS_DVBS2:
 217         case SYS_TURBO:
 218         case SYS_ISDBS:
 219         case SYS_DSS:
 220                 return DVBV3_QPSK;
 221         case SYS_DVBT:
 222         case SYS_DVBT2:
 223         case SYS_ISDBT:
 224         case SYS_DTMB:
 225                 return DVBV3_OFDM;
 226         case SYS_ATSC:
 227         case SYS_ATSCMH:
 228         case SYS_DVBC_ANNEX_B:
 229                 return DVBV3_ATSC;
 230         case SYS_UNDEFINED:
 231         case SYS_ISDBC:
 232         case SYS_DVBH:
 233         case SYS_DAB:
 234         default:
 235                 /*
 236                  * Doesn't know how to emulate those types and/or
 237                  * there's no frontend driver from this type yet
 238                  * with some emulation code, so, we're not sure yet how
 239                  * to handle them, or they're not compatible with a DVBv3 call.
 240                  */
 241                 return DVBV3_UNKNOWN;
 242         }
 243 }
 244
 245 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 246                                    enum fe_status status)
 247 {
 248         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 249         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 250         struct dvb_fe_events *events = &fepriv->events;
 251         struct dvb_frontend_event *e;
 252         int wp;
 253
 254         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 255
 256         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 257                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 258
 259         mutex_lock(&events->mtx);
 260
 261         wp = (events->eventw + 1) % MAX_EVENT;
 262         if (wp == events->eventr) {
 263                 events->overflow = 1;
 264                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 265         }
 266
 267         e = &events->events[events->eventw];
 268         e->status = status;
 269         e->parameters = fepriv->parameters_out;
 270
 271         events->eventw = wp;
 272
 273         mutex_unlock(&events->mtx);
 274
 275         wake_up_interruptible (&events->wait_queue);
 276 }
 277
 278 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 279                             struct dvb_frontend_event *event, int flags)
 280 {
 281         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 282         struct dvb_fe_events *events = &fepriv->events;
 283
 284         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 285
 286         if (events->overflow) {
 287                 events->overflow = 0;
 288                 return -EOVERFLOW;
 289         }
 290
 291         if (events->eventw == events->eventr) {
 292                 int ret;
 293
 294                 if (flags & O_NONBLOCK)
 295                         return -EWOULDBLOCK;
 296
 297                 up(&fepriv->sem);
 298
 299                 ret = wait_event_interruptible (events->wait_queue,
 300                                                 events->eventw != events->eventr);
 301
 302                 if (down_interruptible (&fepriv->sem))
 303                         return -ERESTARTSYS;
 304
 305                 if (ret < 0)
 306                         return ret;
 307         }
 308
 309         mutex_lock(&events->mtx);
 310         *event = events->events[events->eventr];
 311         events->eventr = (events->eventr + 1) % MAX_EVENT;
 312         mutex_unlock(&events->mtx);
 313
 314         return 0;
 315 }
 316
 317 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 318 {
 319         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 320         struct dvb_fe_events *events = &fepriv->events;
 321
 322         mutex_lock(&events->mtx);
 323         events->eventr = events->eventw;
 324         mutex_unlock(&events->mtx);
 325 }
 326
 327 static void dvb_frontend_init(struct dvb_frontend *fe)
 328 {
 329         dev_dbg(fe->dvb->device,
 330                         "%s: initialising adapter %i frontend %i (%s)...\n",
 331                         __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 332
 333         if (fe->ops.init)
 334                 fe->ops.init(fe);
 335         if (fe->ops.tuner_ops.init) {
 336                 if (fe->ops.i2c_gate_ctrl)
 337                         fe->ops.i2c_gate_ctrl(fe, 1);
 338                 fe->ops.tuner_ops.init(fe);
 339                 if (fe->ops.i2c_gate_ctrl)
 340                         fe->ops.i2c_gate_ctrl(fe, 0);
 341         }
 342 }
 343
 344 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 345 {
 346         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 347
 348         fepriv->reinitialise = 1;
 349         dvb_frontend_wakeup(fe);
 350 }
 351 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 352
 353 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 354 {
 355         int q2;
 356         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 357
 358         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 359
 360         if (locked)
 361                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 362         else
 363                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 364
 365         q2 = fepriv->quality - 128;
 366         q2 *= q2;
 367
 368         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 369 }
 370
 371 /**
 372  * Performs automatic twiddling of frontend parameters.
 373  *
 374  * @param fe The frontend concerned.
 375  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 376  * @returns Number of complete iterations that have been performed.
 377  */
 378 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 379 {
 380         int autoinversion;
 381         int ready = 0;
 382         int fe_set_err = 0;
 383         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 384         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 385         int original_inversion = c->inversion;
 386         u32 original_frequency = c->frequency;
 387
 388         /* are we using autoinversion? */
 389         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 390                          (c->inversion == INVERSION_AUTO));
 391
 392         /* setup parameters correctly */
 393         while(!ready) {
 394                 /* calculate the lnb_drift */
 395                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 396
 397                 /* wrap the auto_step if we've exceeded the maximum drift */
 398                 if (fepriv->lnb_drift > fepriv->max_drift) {
 399                         fepriv->auto_step = 0;
 400                         fepriv->auto_sub_step = 0;
 401                         fepriv->lnb_drift = 0;
 402                 }
 403
 404                 /* perform inversion and +/- zigzag */
 405                 switch(fepriv->auto_sub_step) {
 406                 case 0:
 407                         /* try with the current inversion and current drift setting */
 408                         ready = 1;
 409                         break;
 410
 411                 case 1:
 412                         if (!autoinversion) break;
 413
 414                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 415                         ready = 1;
 416                         break;
 417
 418                 case 2:
 419                         if (fepriv->lnb_drift == 0) break;
 420
 421                         fepriv->lnb_drift = -fepriv->lnb_drift;
 422                         ready = 1;
 423                         break;
 424
 425                 case 3:
 426                         if (fepriv->lnb_drift == 0) break;
 427                         if (!autoinversion) break;
 428
 429                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 430                         fepriv->lnb_drift = -fepriv->lnb_drift;
 431                         ready = 1;
 432                         break;
 433
 434                 default:
 435                         fepriv->auto_step++;
 436                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 437                         break;
 438                 }
 439
 440                 if (!ready) fepriv->auto_sub_step++;
 441         }
 442
 443         /* if this attempt would hit where we started, indicate a complete
 444          * iteration has occurred */
 445         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 446             (fepriv->auto_sub_step == 0) && check_wrapped) {
 447                 return 1;
 448         }
 449
 450         dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \
 451                         "auto_sub_step:%i started_auto_step:%i\n",
 452                         __func__, fepriv->lnb_drift, fepriv->inversion,
 453                         fepriv->auto_step, fepriv->auto_sub_step,
 454                         fepriv->started_auto_step);
 455
 456         /* set the frontend itself */
 457         c->frequency += fepriv->lnb_drift;
 458         if (autoinversion)
 459                 c->inversion = fepriv->inversion;
 460         tmp = *c;
 461         if (fe->ops.set_frontend)
 462                 fe_set_err = fe->ops.set_frontend(fe);
 463         *c = tmp;
 464         if (fe_set_err < 0) {
 465                 fepriv->state = FESTATE_ERROR;
 466                 return fe_set_err;
 467         }
 468
 469         c->frequency = original_frequency;
 470         c->inversion = original_inversion;
 471
 472         fepriv->auto_sub_step++;
 473         return 0;
 474 }
 475
 476 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 477 {
 478         enum fe_status s = FE_NONE;
 479         int retval = 0;
 480         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 481         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 482
 483         /* if we've got no parameters, just keep idling */
 484         if (fepriv->state & FESTATE_IDLE) {
 485                 fepriv->delay = 3*HZ;
 486                 fepriv->quality = 0;
 487                 return;
 488         }
 489
 490         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 491         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 492                 if (fepriv->state & FESTATE_RETUNE) {
 493                         tmp = *c;
 494                         if (fe->ops.set_frontend)
 495                                 retval = fe->ops.set_frontend(fe);
 496                         *c = tmp;
 497                         if (retval < 0)
 498                                 fepriv->state = FESTATE_ERROR;
 499                         else
 500                                 fepriv->state = FESTATE_TUNED;
 501                 }
 502                 fepriv->delay = 3*HZ;
 503                 fepriv->quality = 0;
 504                 return;
 505         }
 506
 507         /* get the frontend status */
 508         if (fepriv->state & FESTATE_RETUNE) {
 509                 s = 0;
 510         } else {
 511                 if (fe->ops.read_status)
 512                         fe->ops.read_status(fe, &s);
 513                 if (s != fepriv->status) {
 514                         dvb_frontend_add_event(fe, s);
 515                         fepriv->status = s;
 516                 }
 517         }
 518
 519         /* if we're not tuned, and we have a lock, move to the TUNED state */
 520         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 521                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 522                 fepriv->state = FESTATE_TUNED;
 523
 524                 /* if we're tuned, then we have determined the correct inversion */
 525                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 526                     (c->inversion == INVERSION_AUTO)) {
 527                         c->inversion = fepriv->inversion;
 528                 }
 529                 return;
 530         }
 531
 532         /* if we are tuned already, check we're still locked */
 533         if (fepriv->state & FESTATE_TUNED) {
 534                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 535
 536                 /* we're tuned, and the lock is still good... */
 537                 if (s & FE_HAS_LOCK) {
 538                         return;
 539                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 540                         fepriv->state = FESTATE_ZIGZAG_FAST;
 541                         fepriv->started_auto_step = fepriv->auto_step;
 542                         fepriv->check_wrapped = 0;
 543                 }
 544         }
 545
 546         /* don't actually do anything if we're in the LOSTLOCK state,
 547          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 548         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 549             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 550                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 551                 return;
 552         }
 553
 554         /* don't do anything if we're in the DISEQC state, since this
 555          * might be someone with a motorized dish controlled by DISEQC.
 556          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 557         if (fepriv->state & FESTATE_DISEQC) {
 558                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 559                 return;
 560         }
 561
 562         /* if we're in the RETUNE state, set everything up for a brand
 563          * new scan, keeping the current inversion setting, as the next
 564          * tune is _very_ likely to require the same */
 565         if (fepriv->state & FESTATE_RETUNE) {
 566                 fepriv->lnb_drift = 0;
 567                 fepriv->auto_step = 0;
 568                 fepriv->auto_sub_step = 0;
 569                 fepriv->started_auto_step = 0;
 570                 fepriv->check_wrapped = 0;
 571         }
 572
 573         /* fast zigzag. */
 574         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 575                 fepriv->delay = fepriv->min_delay;
 576
 577                 /* perform a tune */
 578                 retval = dvb_frontend_swzigzag_autotune(fe,
 579                                                         fepriv->check_wrapped);
 580                 if (retval < 0) {
 581                         return;
 582                 } else if (retval) {
 583                         /* OK, if we've run out of trials at the fast speed.
 584                          * Drop back to slow for the _next_ attempt */
 585                         fepriv->state = FESTATE_SEARCHING_SLOW;
 586                         fepriv->started_auto_step = fepriv->auto_step;
 587                         return;
 588                 }
 589                 fepriv->check_wrapped = 1;
 590
 591                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 592                  * This ensures we cannot return from an
 593                  * FE_SET_FRONTEND ioctl before the first frontend tune
 594                  * occurs */
 595                 if (fepriv->state & FESTATE_RETUNE) {
 596                         fepriv->state = FESTATE_TUNING_FAST;
 597                 }
 598         }
 599
 600         /* slow zigzag */
 601         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 602                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 603
 604                 /* Note: don't bother checking for wrapping; we stay in this
 605                  * state until we get a lock */
 606                 dvb_frontend_swzigzag_autotune(fe, 0);
 607         }
 608 }
 609
 610 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 611 {
 612         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 613
 614         if (fe->exit != DVB_FE_NO_EXIT)
 615                 return 1;
 616
 617         if (fepriv->dvbdev->writers == 1)
 618                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 619                                   dvb_shutdown_timeout * HZ))
 620                         return 1;
 621
 622         return 0;
 623 }
 624
 625 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 626 {
 627         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 628
 629         if (fepriv->wakeup) {
 630                 fepriv->wakeup = 0;
 631                 return 1;
 632         }
 633         return dvb_frontend_is_exiting(fe);
 634 }
 635
 636 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 637 {
 638         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 639
 640         fepriv->wakeup = 1;
 641         wake_up_interruptible(&fepriv->wait_queue);
 642 }
 643
 644 static int dvb_frontend_thread(void *data)
 645 {
 646         struct dvb_frontend *fe = data;
 647         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 648         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 649         enum fe_status s = FE_NONE;
 650         enum dvbfe_algo algo;
 651         bool re_tune = false;
 652         bool semheld = false;
 653
 654         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 655
 656         fepriv->check_wrapped = 0;
 657         fepriv->quality = 0;
 658         fepriv->delay = 3*HZ;
 659         fepriv->status = 0;
 660         fepriv->wakeup = 0;
 661         fepriv->reinitialise = 0;
 662
 663         dvb_frontend_init(fe);
 664
 665         set_freezable();
 666         while (1) {
 667                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 668 restart:
 669                 wait_event_interruptible_timeout(fepriv->wait_queue,
 670                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
 671                                 || freezing(current),
 672                         fepriv->delay);
 673
 674                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 675                         /* got signal or quitting */
 676                         if (!down_interruptible(&fepriv->sem))
 677                                 semheld = true;
 678                         fe->exit = DVB_FE_NORMAL_EXIT;
 679                         break;
 680                 }
 681
 682                 if (try_to_freeze())
 683                         goto restart;
 684
 685                 if (down_interruptible(&fepriv->sem))
 686                         break;
 687
 688                 if (fepriv->reinitialise) {
 689                         dvb_frontend_init(fe);
 690                         if (fe->ops.set_tone && fepriv->tone != -1)
 691                                 fe->ops.set_tone(fe, fepriv->tone);
 692                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 693                                 fe->ops.set_voltage(fe, fepriv->voltage);
 694                         fepriv->reinitialise = 0;
 695                 }
 696
 697                 /* do an iteration of the tuning loop */
 698                 if (fe->ops.get_frontend_algo) {
 699                         algo = fe->ops.get_frontend_algo(fe);
 700                         switch (algo) {
 701                         case DVBFE_ALGO_HW:
 702                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 703
 704                                 if (fepriv->state & FESTATE_RETUNE) {
 705                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 706                                         re_tune = true;
 707                                         fepriv->state = FESTATE_TUNED;
 708                                 } else {
 709                                         re_tune = false;
 710                                 }
 711
 712                                 if (fe->ops.tune)
 713                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 714
 715                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 716                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 717                                         dvb_frontend_add_event(fe, s);
 718                                         fepriv->status = s;
 719                                 }
 720                                 break;
 721                         case DVBFE_ALGO_SW:
 722                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 723                                 dvb_frontend_swzigzag(fe);
 724                                 break;
 725                         case DVBFE_ALGO_CUSTOM:
 726                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 727                                 if (fepriv->state & FESTATE_RETUNE) {
 728                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 729                                         fepriv->state = FESTATE_TUNED;
 730                                 }
 731                                 /* Case where we are going to search for a carrier
 732                                  * User asked us to retune again for some reason, possibly
 733                                  * requesting a search with a new set of parameters
 734                                  */
 735                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 736                                         if (fe->ops.search) {
 737                                                 fepriv->algo_status = fe->ops.search(fe);
 738                                                 /* We did do a search as was requested, the flags are
 739                                                  * now unset as well and has the flags wrt to search.
 740                                                  */
 741                                         } else {
 742                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 743                                         }
 744                                 }
 745                                 /* Track the carrier if the search was successful */
 746                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 747                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 748                                         fepriv->delay = HZ / 2;
 749                                 }
 750                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 751                                 fe->ops.read_status(fe, &s);
 752                                 if (s != fepriv->status) {
 753                                         dvb_frontend_add_event(fe, s); /* update event list */
 754                                         fepriv->status = s;
 755                                         if (!(s & FE_HAS_LOCK)) {
 756                                                 fepriv->delay = HZ / 10;
 757                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 758                                         } else {
 759                                                 fepriv->delay = 60 * HZ;
 760                                         }
 761                                 }
 762                                 break;
 763                         default:
 764                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 765                                 break;
 766                         }
 767                 } else {
 768                         dvb_frontend_swzigzag(fe);
 769                 }
 770         }
 771
 772         if (dvb_powerdown_on_sleep) {
 773                 if (fe->ops.set_voltage)
 774                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 775                 if (fe->ops.tuner_ops.sleep) {
 776                         if (fe->ops.i2c_gate_ctrl)
 777                                 fe->ops.i2c_gate_ctrl(fe, 1);
 778                         fe->ops.tuner_ops.sleep(fe);
 779                         if (fe->ops.i2c_gate_ctrl)
 780                                 fe->ops.i2c_gate_ctrl(fe, 0);
 781                 }
 782                 if (fe->ops.sleep)
 783                         fe->ops.sleep(fe);
 784         }
 785
 786         fepriv->thread = NULL;
 787         if (kthread_should_stop())
 788                 fe->exit = DVB_FE_DEVICE_REMOVED;
 789         else
 790                 fe->exit = DVB_FE_NO_EXIT;
 791         mb();
 792
 793         if (semheld)
 794                 up(&fepriv->sem);
 795         dvb_frontend_wakeup(fe);
 796         return 0;
 797 }
 798
 799 static void dvb_frontend_stop(struct dvb_frontend *fe)
 800 {
 801         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 802
 803         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 804
 805         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 806                 fe->exit = DVB_FE_NORMAL_EXIT;
 807         mb();
 808
 809         if (!fepriv->thread)
 810                 return;
 811
 812         kthread_stop(fepriv->thread);
 813
 814         sema_init(&fepriv->sem, 1);
 815         fepriv->state = FESTATE_IDLE;
 816
 817         /* paranoia check in case a signal arrived */
 818         if (fepriv->thread)
 819                 dev_warn(fe->dvb->device,
 820                                 "dvb_frontend_stop: warning: thread %p won't exit\n",
 821                                 fepriv->thread);
 822 }
 823
 824 /*
 825  * Sleep for the amount of time given by add_usec parameter
 826  *
 827  * This needs to be as precise as possible, as it affects the detection of
 828  * the dish tone command at the satellite subsystem. The precision is improved
 829  * by using a scheduled msleep followed by udelay for the remainder.
 830  */
 831 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 832 {
 833         s32 delta;
 834
 835         *waketime = ktime_add_us(*waketime, add_usec);
 836         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 837         if (delta > 2500) {
 838                 msleep((delta - 1500) / 1000);
 839                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 840         }
 841         if (delta > 0)
 842                 udelay(delta);
 843 }
 844 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 845
 846 static int dvb_frontend_start(struct dvb_frontend *fe)
 847 {
 848         int ret;
 849         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 850         struct task_struct *fe_thread;
 851
 852         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 853
 854         if (fepriv->thread) {
 855                 if (fe->exit == DVB_FE_NO_EXIT)
 856                         return 0;
 857                 else
 858                         dvb_frontend_stop (fe);
 859         }
 860
 861         if (signal_pending(current))
 862                 return -EINTR;
 863         if (down_interruptible (&fepriv->sem))
 864                 return -EINTR;
 865
 866         fepriv->state = FESTATE_IDLE;
 867         fe->exit = DVB_FE_NO_EXIT;
 868         fepriv->thread = NULL;
 869         mb();
 870
 871         fe_thread = kthread_run(dvb_frontend_thread, fe,
 872                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
 873         if (IS_ERR(fe_thread)) {
 874                 ret = PTR_ERR(fe_thread);
 875                 dev_warn(fe->dvb->device,
 876                                 "dvb_frontend_start: failed to start kthread (%d)\n",
 877                                 ret);
 878                 up(&fepriv->sem);
 879                 return ret;
 880         }
 881         fepriv->thread = fe_thread;
 882         return 0;
 883 }
 884
 885 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 886                                         u32 *freq_min, u32 *freq_max)
 887 {
 888         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 889
 890         if (fe->ops.info.frequency_max == 0)
 891                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 892         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 893                 *freq_max = fe->ops.info.frequency_max;
 894         else
 895                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 896
 897         if (*freq_min == 0 || *freq_max == 0)
 898                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 899                                 fe->dvb->num, fe->id);
 900 }
 901
 902 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 903 {
 904         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 905         u32 freq_min;
 906         u32 freq_max;
 907
 908         /* range check: frequency */
 909         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max);
 910         if ((freq_min && c->frequency < freq_min) ||
 911             (freq_max && c->frequency > freq_max)) {
 912                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 913                                 fe->dvb->num, fe->id, c->frequency,
 914                                 freq_min, freq_max);
 915                 return -EINVAL;
 916         }
 917
 918         /* range check: symbol rate */
 919         switch (c->delivery_system) {
 920         case SYS_DVBS:
 921         case SYS_DVBS2:
 922         case SYS_TURBO:
 923         case SYS_DVBC_ANNEX_A:
 924         case SYS_DVBC_ANNEX_C:
 925                 if ((fe->ops.info.symbol_rate_min &&
 926                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 927                     (fe->ops.info.symbol_rate_max &&
 928                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 929                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 930                                         fe->dvb->num, fe->id, c->symbol_rate,
 931                                         fe->ops.info.symbol_rate_min,
 932                                         fe->ops.info.symbol_rate_max);
 933                         return -EINVAL;
 934                 }
 935         default:
 936                 break;
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 943 {
 944         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 945         int i;
 946         u32 delsys;
 947
 948         delsys = c->delivery_system;
 949         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
 950         c->delivery_system = delsys;
 951
 952         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
 953                         __func__, c->delivery_system);
 954
 955         c->transmission_mode = TRANSMISSION_MODE_AUTO;
 956         c->bandwidth_hz = 0;    /* AUTO */
 957         c->guard_interval = GUARD_INTERVAL_AUTO;
 958         c->hierarchy = HIERARCHY_AUTO;
 959         c->symbol_rate = 0;
 960         c->code_rate_HP = FEC_AUTO;
 961         c->code_rate_LP = FEC_AUTO;
 962         c->fec_inner = FEC_AUTO;
 963         c->rolloff = ROLLOFF_AUTO;
 964         c->voltage = SEC_VOLTAGE_OFF;
 965         c->sectone = SEC_TONE_OFF;
 966         c->pilot = PILOT_AUTO;
 967
 968         c->isdbt_partial_reception = 0;
 969         c->isdbt_sb_mode = 0;
 970         c->isdbt_sb_subchannel = 0;
 971         c->isdbt_sb_segment_idx = 0;
 972         c->isdbt_sb_segment_count = 0;
 973         c->isdbt_layer_enabled = 0;
 974         for (i = 0; i < 3; i++) {
 975                 c->layer[i].fec = FEC_AUTO;
 976                 c->layer[i].modulation = QAM_AUTO;
 977                 c->layer[i].interleaving = 0;
 978                 c->layer[i].segment_count = 0;
 979         }
 980
 981         c->stream_id = NO_STREAM_ID_FILTER;
 982
 983         switch (c->delivery_system) {
 984         case SYS_DVBS:
 985         case SYS_DVBS2:
 986         case SYS_TURBO:
 987                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
 988                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
 989                 break;
 990         case SYS_ATSC:
 991                 c->modulation = VSB_8;
 992                 break;
 993         case SYS_ISDBS:
 994                 c->symbol_rate = 28860000;
 995                 c->rolloff = ROLLOFF_35;
 996                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
 997                 break;
 998         default:
 999                 c->modulation = QAM_AUTO;
1000                 break;
1001         }
1002
1003         c->lna = LNA_AUTO;
1004
1005         return 0;
1006 }
1007
1008 #define _DTV_CMD(n, s, b) \
1009 [n] = { \
1010         .name = #n, \
1011         .cmd  = n, \
1012         .set  = s,\
1013         .buffer = b \
1014 }
1015
1016 struct dtv_cmds_h {
1017         char    *name;          /* A display name for debugging purposes */
1018
1019         __u32   cmd;            /* A unique ID */
1020
1021         /* Flags */
1022         __u32   set:1;          /* Either a set or get property */
1023         __u32   buffer:1;       /* Does this property use the buffer? */
1024         __u32   reserved:30;    /* Align */
1025 };
1026
1027 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1028         _DTV_CMD(DTV_TUNE, 1, 0),
1029         _DTV_CMD(DTV_CLEAR, 1, 0),
1030
1031         /* Set */
1032         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1033         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1034         _DTV_CMD(DTV_MODULATION, 1, 0),
1035         _DTV_CMD(DTV_INVERSION, 1, 0),
1036         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1037         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1038         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1039         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1040         _DTV_CMD(DTV_TONE, 1, 0),
1041         _DTV_CMD(DTV_PILOT, 1, 0),
1042         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1043         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1044         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1045         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1046         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1047         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1048         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1049         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1050
1051         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1052         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1053         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1054         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1055         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1056         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1057         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1058         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1059         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1060         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1061         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1062         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1063         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1064         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1065         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1066         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1067         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1068         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1069
1070         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1071         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1072         _DTV_CMD(DTV_LNA, 1, 0),
1073
1074         /* Get */
1075         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1076         _DTV_CMD(DTV_API_VERSION, 0, 0),
1077
1078         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1079
1080         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1081         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1082
1083         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1084         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1085         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1086         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1087         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1088         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1089         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1090         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1091         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1092         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1093         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1094         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1095         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1096
1097         /* Statistics API */
1098         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1099         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1100         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1101         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1102         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1103         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1104         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1105         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1106 };
1107
1108 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1109  * drivers can use a single set_frontend tuning function, regardless of whether
1110  * it's being used for the legacy or new API, reducing code and complexity.
1111  */
1112 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1113                                    struct dtv_frontend_properties *c,
1114                                    const struct dvb_frontend_parameters *p)
1115 {
1116         c->frequency = p->frequency;
1117         c->inversion = p->inversion;
1118
1119         switch (dvbv3_type(c->delivery_system)) {
1120         case DVBV3_QPSK:
1121                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1122                 c->symbol_rate = p->u.qpsk.symbol_rate;
1123                 c->fec_inner = p->u.qpsk.fec_inner;
1124                 break;
1125         case DVBV3_QAM:
1126                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1127                 c->symbol_rate = p->u.qam.symbol_rate;
1128                 c->fec_inner = p->u.qam.fec_inner;
1129                 c->modulation = p->u.qam.modulation;
1130                 break;
1131         case DVBV3_OFDM:
1132                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1133
1134                 switch (p->u.ofdm.bandwidth) {
1135                 case BANDWIDTH_10_MHZ:
1136                         c->bandwidth_hz = 10000000;
1137                         break;
1138                 case BANDWIDTH_8_MHZ:
1139                         c->bandwidth_hz = 8000000;
1140                         break;
1141                 case BANDWIDTH_7_MHZ:
1142                         c->bandwidth_hz = 7000000;
1143                         break;
1144                 case BANDWIDTH_6_MHZ:
1145                         c->bandwidth_hz = 6000000;
1146                         break;
1147                 case BANDWIDTH_5_MHZ:
1148                         c->bandwidth_hz = 5000000;
1149                         break;
1150                 case BANDWIDTH_1_712_MHZ:
1151                         c->bandwidth_hz = 1712000;
1152                         break;
1153                 case BANDWIDTH_AUTO:
1154                         c->bandwidth_hz = 0;
1155                 }
1156
1157                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1158                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1159                 c->modulation = p->u.ofdm.constellation;
1160                 c->transmission_mode = p->u.ofdm.transmission_mode;
1161                 c->guard_interval = p->u.ofdm.guard_interval;
1162                 c->hierarchy = p->u.ofdm.hierarchy_information;
1163                 break;
1164         case DVBV3_ATSC:
1165                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1166                 c->modulation = p->u.vsb.modulation;
1167                 if (c->delivery_system == SYS_ATSCMH)
1168                         break;
1169                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1170                         c->delivery_system = SYS_ATSC;
1171                 else
1172                         c->delivery_system = SYS_DVBC_ANNEX_B;
1173                 break;
1174         case DVBV3_UNKNOWN:
1175                 dev_err(fe->dvb->device,
1176                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1177                                 __func__, c->delivery_system);
1178                 return -EINVAL;
1179         }
1180
1181         return 0;
1182 }
1183
1184 /* Ensure the cached values are set correctly in the frontend
1185  * legacy tuning structures, for the advanced tuning API.
1186  */
1187 static int
1188 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1189                                 const struct dtv_frontend_properties *c,
1190                                 struct dvb_frontend_parameters *p)
1191 {
1192         p->frequency = c->frequency;
1193         p->inversion = c->inversion;
1194
1195         switch (dvbv3_type(c->delivery_system)) {
1196         case DVBV3_UNKNOWN:
1197                 dev_err(fe->dvb->device,
1198                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1199                                 __func__, c->delivery_system);
1200                 return -EINVAL;
1201         case DVBV3_QPSK:
1202                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1203                 p->u.qpsk.symbol_rate = c->symbol_rate;
1204                 p->u.qpsk.fec_inner = c->fec_inner;
1205                 break;
1206         case DVBV3_QAM:
1207                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1208                 p->u.qam.symbol_rate = c->symbol_rate;
1209                 p->u.qam.fec_inner = c->fec_inner;
1210                 p->u.qam.modulation = c->modulation;
1211                 break;
1212         case DVBV3_OFDM:
1213                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1214                 switch (c->bandwidth_hz) {
1215                 case 10000000:
1216                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1217                         break;
1218                 case 8000000:
1219                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1220                         break;
1221                 case 7000000:
1222                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1223                         break;
1224                 case 6000000:
1225                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1226                         break;
1227                 case 5000000:
1228                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1229                         break;
1230                 case 1712000:
1231                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1232                         break;
1233                 case 0:
1234                 default:
1235                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1236                 }
1237                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1238                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1239                 p->u.ofdm.constellation = c->modulation;
1240                 p->u.ofdm.transmission_mode = c->transmission_mode;
1241                 p->u.ofdm.guard_interval = c->guard_interval;
1242                 p->u.ofdm.hierarchy_information = c->hierarchy;
1243                 break;
1244         case DVBV3_ATSC:
1245                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1246                 p->u.vsb.modulation = c->modulation;
1247                 break;
1248         }
1249         return 0;
1250 }
1251
1252 /**
1253  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1254  * @fe:         struct dvb_frontend pointer
1255  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1256  * @p_out       struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1257  *
1258  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1259  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1260  * If p_out is not null, it will update the DVBv3 params pointed by it.
1261  */
1262 static int dtv_get_frontend(struct dvb_frontend *fe,
1263                             struct dtv_frontend_properties *c,
1264                             struct dvb_frontend_parameters *p_out)
1265 {
1266         int r;
1267
1268         if (fe->ops.get_frontend) {
1269                 r = fe->ops.get_frontend(fe, c);
1270                 if (unlikely(r < 0))
1271                         return r;
1272                 if (p_out)
1273                         dtv_property_legacy_params_sync(fe, c, p_out);
1274                 return 0;
1275         }
1276
1277         /* As everything is in cache, get_frontend fops are always supported */
1278         return 0;
1279 }
1280
1281 static int dvb_frontend_handle_ioctl(struct file *file,
1282                                      unsigned int cmd, void *parg);
1283
1284 static int dtv_property_process_get(struct dvb_frontend *fe,
1285                                     const struct dtv_frontend_properties *c,
1286                                     struct dtv_property *tvp,
1287                                     struct file *file)
1288 {
1289         int ncaps;
1290
1291         switch(tvp->cmd) {
1292         case DTV_ENUM_DELSYS:
1293                 ncaps = 0;
1294                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1295                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1296                         ncaps++;
1297                 }
1298                 tvp->u.buffer.len = ncaps;
1299                 break;
1300         case DTV_FREQUENCY:
1301                 tvp->u.data = c->frequency;
1302                 break;
1303         case DTV_MODULATION:
1304                 tvp->u.data = c->modulation;
1305                 break;
1306         case DTV_BANDWIDTH_HZ:
1307                 tvp->u.data = c->bandwidth_hz;
1308                 break;
1309         case DTV_INVERSION:
1310                 tvp->u.data = c->inversion;
1311                 break;
1312         case DTV_SYMBOL_RATE:
1313                 tvp->u.data = c->symbol_rate;
1314                 break;
1315         case DTV_INNER_FEC:
1316                 tvp->u.data = c->fec_inner;
1317                 break;
1318         case DTV_PILOT:
1319                 tvp->u.data = c->pilot;
1320                 break;
1321         case DTV_ROLLOFF:
1322                 tvp->u.data = c->rolloff;
1323                 break;
1324         case DTV_DELIVERY_SYSTEM:
1325                 tvp->u.data = c->delivery_system;
1326                 break;
1327         case DTV_VOLTAGE:
1328                 tvp->u.data = c->voltage;
1329                 break;
1330         case DTV_TONE:
1331                 tvp->u.data = c->sectone;
1332                 break;
1333         case DTV_API_VERSION:
1334                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1335                 break;
1336         case DTV_CODE_RATE_HP:
1337                 tvp->u.data = c->code_rate_HP;
1338                 break;
1339         case DTV_CODE_RATE_LP:
1340                 tvp->u.data = c->code_rate_LP;
1341                 break;
1342         case DTV_GUARD_INTERVAL:
1343                 tvp->u.data = c->guard_interval;
1344                 break;
1345         case DTV_TRANSMISSION_MODE:
1346                 tvp->u.data = c->transmission_mode;
1347                 break;
1348         case DTV_HIERARCHY:
1349                 tvp->u.data = c->hierarchy;
1350                 break;
1351         case DTV_INTERLEAVING:
1352                 tvp->u.data = c->interleaving;
1353                 break;
1354
1355         /* ISDB-T Support here */
1356         case DTV_ISDBT_PARTIAL_RECEPTION:
1357                 tvp->u.data = c->isdbt_partial_reception;
1358                 break;
1359         case DTV_ISDBT_SOUND_BROADCASTING:
1360                 tvp->u.data = c->isdbt_sb_mode;
1361                 break;
1362         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1363                 tvp->u.data = c->isdbt_sb_subchannel;
1364                 break;
1365         case DTV_ISDBT_SB_SEGMENT_IDX:
1366                 tvp->u.data = c->isdbt_sb_segment_idx;
1367                 break;
1368         case DTV_ISDBT_SB_SEGMENT_COUNT:
1369                 tvp->u.data = c->isdbt_sb_segment_count;
1370                 break;
1371         case DTV_ISDBT_LAYER_ENABLED:
1372                 tvp->u.data = c->isdbt_layer_enabled;
1373                 break;
1374         case DTV_ISDBT_LAYERA_FEC:
1375                 tvp->u.data = c->layer[0].fec;
1376                 break;
1377         case DTV_ISDBT_LAYERA_MODULATION:
1378                 tvp->u.data = c->layer[0].modulation;
1379                 break;
1380         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1381                 tvp->u.data = c->layer[0].segment_count;
1382                 break;
1383         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1384                 tvp->u.data = c->layer[0].interleaving;
1385                 break;
1386         case DTV_ISDBT_LAYERB_FEC:
1387                 tvp->u.data = c->layer[1].fec;
1388                 break;
1389         case DTV_ISDBT_LAYERB_MODULATION:
1390                 tvp->u.data = c->layer[1].modulation;
1391                 break;
1392         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1393                 tvp->u.data = c->layer[1].segment_count;
1394                 break;
1395         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1396                 tvp->u.data = c->layer[1].interleaving;
1397                 break;
1398         case DTV_ISDBT_LAYERC_FEC:
1399                 tvp->u.data = c->layer[2].fec;
1400                 break;
1401         case DTV_ISDBT_LAYERC_MODULATION:
1402                 tvp->u.data = c->layer[2].modulation;
1403                 break;
1404         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1405                 tvp->u.data = c->layer[2].segment_count;
1406                 break;
1407         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1408                 tvp->u.data = c->layer[2].interleaving;
1409                 break;
1410
1411         /* Multistream support */
1412         case DTV_STREAM_ID:
1413         case DTV_DVBT2_PLP_ID_LEGACY:
1414                 tvp->u.data = c->stream_id;
1415                 break;
1416
1417         /* ATSC-MH */
1418         case DTV_ATSCMH_FIC_VER:
1419                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1420                 break;
1421         case DTV_ATSCMH_PARADE_ID:
1422                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1423                 break;
1424         case DTV_ATSCMH_NOG:
1425                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1426                 break;
1427         case DTV_ATSCMH_TNOG:
1428                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1429                 break;
1430         case DTV_ATSCMH_SGN:
1431                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1432                 break;
1433         case DTV_ATSCMH_PRC:
1434                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1435                 break;
1436         case DTV_ATSCMH_RS_FRAME_MODE:
1437                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1438                 break;
1439         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1440                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1441                 break;
1442         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1443                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1444                 break;
1445         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1446                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1447                 break;
1448         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1449                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1450                 break;
1451         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1452                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1453                 break;
1454         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1455                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1456                 break;
1457         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1458                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1459                 break;
1460         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1461                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1462                 break;
1463
1464         case DTV_LNA:
1465                 tvp->u.data = c->lna;
1466                 break;
1467
1468         /* Fill quality measures */
1469         case DTV_STAT_SIGNAL_STRENGTH:
1470                 tvp->u.st = c->strength;
1471                 break;
1472         case DTV_STAT_CNR:
1473                 tvp->u.st = c->cnr;
1474                 break;
1475         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1476                 tvp->u.st = c->pre_bit_error;
1477                 break;
1478         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1479                 tvp->u.st = c->pre_bit_count;
1480                 break;
1481         case DTV_STAT_POST_ERROR_BIT_COUNT:
1482                 tvp->u.st = c->post_bit_error;
1483                 break;
1484         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1485                 tvp->u.st = c->post_bit_count;
1486                 break;
1487         case DTV_STAT_ERROR_BLOCK_COUNT:
1488                 tvp->u.st = c->block_error;
1489                 break;
1490         case DTV_STAT_TOTAL_BLOCK_COUNT:
1491                 tvp->u.st = c->block_count;
1492                 break;
1493         default:
1494                 dev_dbg(fe->dvb->device,
1495                         "%s: FE property %d doesn't exist\n",
1496                         __func__, tvp->cmd);
1497                 return -EINVAL;
1498         }
1499
1500         if (!dtv_cmds[tvp->cmd].buffer)
1501                 dev_dbg(fe->dvb->device,
1502                         "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1503                         __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1504                         tvp->u.data);
1505         else
1506                 dev_dbg(fe->dvb->device,
1507                         "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1508                         __func__,
1509                         tvp->cmd, dtv_cmds[tvp->cmd].name,
1510                         tvp->u.buffer.len,
1511                         tvp->u.buffer.len, tvp->u.buffer.data);
1512
1513         return 0;
1514 }
1515
1516 static int dtv_set_frontend(struct dvb_frontend *fe);
1517
1518 static bool is_dvbv3_delsys(u32 delsys)
1519 {
1520         return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1521                (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1522 }
1523
1524 /**
1525  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1526  * @fe:                 struct frontend;
1527  * @delsys:                     DVBv5 type that will be used for emulation
1528  *
1529  * Provides emulation for delivery systems that are compatible with the old
1530  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1531  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1532  * parameters are compatible with DVB-S spec.
1533  */
1534 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1535 {
1536         int i;
1537         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1538
1539         c->delivery_system = delsys;
1540
1541         /*
1542          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1543          */
1544         if (c->delivery_system == SYS_ISDBT) {
1545                 dev_dbg(fe->dvb->device,
1546                         "%s: Using defaults for SYS_ISDBT\n",
1547                         __func__);
1548
1549                 if (!c->bandwidth_hz)
1550                         c->bandwidth_hz = 6000000;
1551
1552                 c->isdbt_partial_reception = 0;
1553                 c->isdbt_sb_mode = 0;
1554                 c->isdbt_sb_subchannel = 0;
1555                 c->isdbt_sb_segment_idx = 0;
1556                 c->isdbt_sb_segment_count = 0;
1557                 c->isdbt_layer_enabled = 7;
1558                 for (i = 0; i < 3; i++) {
1559                         c->layer[i].fec = FEC_AUTO;
1560                         c->layer[i].modulation = QAM_AUTO;
1561                         c->layer[i].interleaving = 0;
1562                         c->layer[i].segment_count = 0;
1563                 }
1564         }
1565         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1566                 __func__, c->delivery_system);
1567
1568         return 0;
1569 }
1570
1571 /**
1572  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1573  * @fe:                 frontend struct
1574  * @desired_system:     delivery system requested by the user
1575  *
1576  * A DVBv5 call know what's the desired system it wants. So, set it.
1577  *
1578  * There are, however, a few known issues with early DVBv5 applications that
1579  * are also handled by this logic:
1580  *
1581  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1582  *    This is an API violation, but, as we don't want to break userspace,
1583  *    convert it to the first supported delivery system.
1584  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1585  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1586  *    ISDB-T provided backward compat with DVB-T.
1587  */
1588 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1589                                      u32 desired_system)
1590 {
1591         int ncaps;
1592         u32 delsys = SYS_UNDEFINED;
1593         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1594         enum dvbv3_emulation_type type;
1595
1596         /*
1597          * It was reported that some old DVBv5 applications were
1598          * filling delivery_system with SYS_UNDEFINED. If this happens,
1599          * assume that the application wants to use the first supported
1600          * delivery system.
1601          */
1602         if (desired_system == SYS_UNDEFINED)
1603                 desired_system = fe->ops.delsys[0];
1604
1605         /*
1606          * This is a DVBv5 call. So, it likely knows the supported
1607          * delivery systems. So, check if the desired delivery system is
1608          * supported
1609          */
1610         ncaps = 0;
1611         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1612                 if (fe->ops.delsys[ncaps] == desired_system) {
1613                         c->delivery_system = desired_system;
1614                         dev_dbg(fe->dvb->device,
1615                                         "%s: Changing delivery system to %d\n",
1616                                         __func__, desired_system);
1617                         return 0;
1618                 }
1619                 ncaps++;
1620         }
1621
1622         /*
1623          * The requested delivery system isn't supported. Maybe userspace
1624          * is requesting a DVBv3 compatible delivery system.
1625          *
1626          * The emulation only works if the desired system is one of the
1627          * delivery systems supported by DVBv3 API
1628          */
1629         if (!is_dvbv3_delsys(desired_system)) {
1630                 dev_dbg(fe->dvb->device,
1631                         "%s: Delivery system %d not supported.\n",
1632                         __func__, desired_system);
1633                 return -EINVAL;
1634         }
1635
1636         type = dvbv3_type(desired_system);
1637
1638         /*
1639         * Get the last non-DVBv3 delivery system that has the same type
1640         * of the desired system
1641         */
1642         ncaps = 0;
1643         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1644                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1645                         delsys = fe->ops.delsys[ncaps];
1646                 ncaps++;
1647         }
1648
1649         /* There's nothing compatible with the desired delivery system */
1650         if (delsys == SYS_UNDEFINED) {
1651                 dev_dbg(fe->dvb->device,
1652                         "%s: Delivery system %d not supported on emulation mode.\n",
1653                         __func__, desired_system);
1654                 return -EINVAL;
1655         }
1656
1657         dev_dbg(fe->dvb->device,
1658                 "%s: Using delivery system %d emulated as if it were %d\n",
1659                 __func__, delsys, desired_system);
1660
1661         return emulate_delivery_system(fe, desired_system);
1662 }
1663
1664 /**
1665  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1666  * @fe: frontend struct
1667  *
1668  * A DVBv3 call doesn't know what's the desired system it wants. It also
1669  * doesn't allow to switch between different types. Due to that, userspace
1670  * should use DVBv5 instead.
1671  * However, in order to avoid breaking userspace API, limited backward
1672  * compatibility support is provided.
1673  *
1674  * There are some delivery systems that are incompatible with DVBv3 calls.
1675  *
1676  * This routine should work fine for frontends that support just one delivery
1677  * system.
1678  *
1679  * For frontends that support multiple frontends:
1680  * 1) It defaults to use the first supported delivery system. There's an
1681  *    userspace application that allows changing it at runtime;
1682  *
1683  * 2) If the current delivery system is not compatible with DVBv3, it gets
1684  *    the first one that it is compatible.
1685  *
1686  * NOTE: in order for this to work with applications like Kaffeine that
1687  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1688  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1689  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1690  *      to DVB-S.
1691  */
1692 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1693 {
1694         int ncaps;
1695         u32 delsys = SYS_UNDEFINED;
1696         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1697
1698         /* If not set yet, defaults to the first supported delivery system */
1699         if (c->delivery_system == SYS_UNDEFINED)
1700                 c->delivery_system = fe->ops.delsys[0];
1701
1702         /*
1703          * Trivial case: just use the current one, if it already a DVBv3
1704          * delivery system
1705          */
1706         if (is_dvbv3_delsys(c->delivery_system)) {
1707                 dev_dbg(fe->dvb->device,
1708                                 "%s: Using delivery system to %d\n",
1709                                 __func__, c->delivery_system);
1710                 return 0;
1711         }
1712
1713         /*
1714          * Seek for the first delivery system that it is compatible with a
1715          * DVBv3 standard
1716          */
1717         ncaps = 0;
1718         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1719                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1720                         delsys = fe->ops.delsys[ncaps];
1721                         break;
1722                 }
1723                 ncaps++;
1724         }
1725         if (delsys == SYS_UNDEFINED) {
1726                 dev_dbg(fe->dvb->device,
1727                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1728                         __func__);
1729                 return -EINVAL;
1730         }
1731         return emulate_delivery_system(fe, delsys);
1732 }
1733
1734 /**
1735  * dtv_property_process_set -  Sets a single DTV property
1736  * @fe:         Pointer to &struct dvb_frontend
1737  * @file:       Pointer to &struct file
1738  * @cmd:        Digital TV command
1739  * @data:       An unsigned 32-bits number
1740  *
1741  * This routine assigns the property
1742  * value to the corresponding member of
1743  * &struct dtv_frontend_properties
1744  *
1745  * Returns:
1746  * Zero on success, negative errno on failure.
1747  */
1748 static int dtv_property_process_set(struct dvb_frontend *fe,
1749                                         struct file *file,
1750                                         u32 cmd, u32 data)
1751 {
1752         int r = 0;
1753         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1754
1755         /** Dump DTV command name and value*/
1756         if (!cmd || cmd > DTV_MAX_COMMAND)
1757                 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1758                                  __func__, cmd);
1759         else
1760                 dev_dbg(fe->dvb->device,
1761                                 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1762                                 __func__, cmd, dtv_cmds[cmd].name, data);
1763         switch (cmd) {
1764         case DTV_CLEAR:
1765                 /*
1766                  * Reset a cache of data specific to the frontend here. This does
1767                  * not effect hardware.
1768                  */
1769                 dvb_frontend_clear_cache(fe);
1770                 break;
1771         case DTV_TUNE:
1772                 /*
1773                  * Use the cached Digital TV properties to tune the
1774                  * frontend
1775                  */
1776                 dev_dbg(fe->dvb->device,
1777                         "%s: Setting the frontend from property cache\n",
1778                         __func__);
1779
1780                 r = dtv_set_frontend(fe);
1781                 break;
1782         case DTV_FREQUENCY:
1783                 c->frequency = data;
1784                 break;
1785         case DTV_MODULATION:
1786                 c->modulation = data;
1787                 break;
1788         case DTV_BANDWIDTH_HZ:
1789                 c->bandwidth_hz = data;
1790                 break;
1791         case DTV_INVERSION:
1792                 c->inversion = data;
1793                 break;
1794         case DTV_SYMBOL_RATE:
1795                 c->symbol_rate = data;
1796                 break;
1797         case DTV_INNER_FEC:
1798                 c->fec_inner = data;
1799                 break;
1800         case DTV_PILOT:
1801                 c->pilot = data;
1802                 break;
1803         case DTV_ROLLOFF:
1804                 c->rolloff = data;
1805                 break;
1806         case DTV_DELIVERY_SYSTEM:
1807                 r = dvbv5_set_delivery_system(fe, data);
1808                 break;
1809         case DTV_VOLTAGE:
1810                 c->voltage = data;
1811                 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1812                         (void *)c->voltage);
1813                 break;
1814         case DTV_TONE:
1815                 c->sectone = data;
1816                 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1817                         (void *)c->sectone);
1818                 break;
1819         case DTV_CODE_RATE_HP:
1820                 c->code_rate_HP = data;
1821                 break;
1822         case DTV_CODE_RATE_LP:
1823                 c->code_rate_LP = data;
1824                 break;
1825         case DTV_GUARD_INTERVAL:
1826                 c->guard_interval = data;
1827                 break;
1828         case DTV_TRANSMISSION_MODE:
1829                 c->transmission_mode = data;
1830                 break;
1831         case DTV_HIERARCHY:
1832                 c->hierarchy = data;
1833                 break;
1834         case DTV_INTERLEAVING:
1835                 c->interleaving = data;
1836                 break;
1837
1838         /* ISDB-T Support here */
1839         case DTV_ISDBT_PARTIAL_RECEPTION:
1840                 c->isdbt_partial_reception = data;
1841                 break;
1842         case DTV_ISDBT_SOUND_BROADCASTING:
1843                 c->isdbt_sb_mode = data;
1844                 break;
1845         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1846                 c->isdbt_sb_subchannel = data;
1847                 break;
1848         case DTV_ISDBT_SB_SEGMENT_IDX:
1849                 c->isdbt_sb_segment_idx = data;
1850                 break;
1851         case DTV_ISDBT_SB_SEGMENT_COUNT:
1852                 c->isdbt_sb_segment_count = data;
1853                 break;
1854         case DTV_ISDBT_LAYER_ENABLED:
1855                 c->isdbt_layer_enabled = data;
1856                 break;
1857         case DTV_ISDBT_LAYERA_FEC:
1858                 c->layer[0].fec = data;
1859                 break;
1860         case DTV_ISDBT_LAYERA_MODULATION:
1861                 c->layer[0].modulation = data;
1862                 break;
1863         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1864                 c->layer[0].segment_count = data;
1865                 break;
1866         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1867                 c->layer[0].interleaving = data;
1868                 break;
1869         case DTV_ISDBT_LAYERB_FEC:
1870                 c->layer[1].fec = data;
1871                 break;
1872         case DTV_ISDBT_LAYERB_MODULATION:
1873                 c->layer[1].modulation = data;
1874                 break;
1875         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1876                 c->layer[1].segment_count = data;
1877                 break;
1878         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1879                 c->layer[1].interleaving = data;
1880                 break;
1881         case DTV_ISDBT_LAYERC_FEC:
1882                 c->layer[2].fec = data;
1883                 break;
1884         case DTV_ISDBT_LAYERC_MODULATION:
1885                 c->layer[2].modulation = data;
1886                 break;
1887         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1888                 c->layer[2].segment_count = data;
1889                 break;
1890         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1891                 c->layer[2].interleaving = data;
1892                 break;
1893
1894         /* Multistream support */
1895         case DTV_STREAM_ID:
1896         case DTV_DVBT2_PLP_ID_LEGACY:
1897                 c->stream_id = data;
1898                 break;
1899
1900         /* ATSC-MH */
1901         case DTV_ATSCMH_PARADE_ID:
1902                 fe->dtv_property_cache.atscmh_parade_id = data;
1903                 break;
1904         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1905                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1906                 break;
1907
1908         case DTV_LNA:
1909                 c->lna = data;
1910                 if (fe->ops.set_lna)
1911                         r = fe->ops.set_lna(fe);
1912                 if (r < 0)
1913                         c->lna = LNA_AUTO;
1914                 break;
1915
1916         default:
1917                 return -EINVAL;
1918         }
1919
1920         return r;
1921 }
1922
1923 static int dvb_frontend_ioctl(struct file *file, unsigned int cmd, void *parg)
1924 {
1925         struct dvb_device *dvbdev = file->private_data;
1926         struct dvb_frontend *fe = dvbdev->priv;
1927         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1928         int err;
1929
1930         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1931         if (down_interruptible(&fepriv->sem))
1932                 return -ERESTARTSYS;
1933
1934         if (fe->exit != DVB_FE_NO_EXIT) {
1935                 up(&fepriv->sem);
1936                 return -ENODEV;
1937         }
1938
1939         /*
1940          * If the frontend is opened in read-only mode, only the ioctls
1941          * that don't interfere with the tune logic should be accepted.
1942          * That allows an external application to monitor the DVB QoS and
1943          * statistics parameters.
1944          *
1945          * That matches all _IOR() ioctls, except for two special cases:
1946          *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
1947          *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
1948          *     setup
1949          * So, those two ioctls should also return -EPERM, as otherwise
1950          * reading from them would interfere with a DVB tune application
1951          */
1952         if ((file->f_flags & O_ACCMODE) == O_RDONLY
1953             && (_IOC_DIR(cmd) != _IOC_READ
1954                 || cmd == FE_GET_EVENT
1955                 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
1956                 up(&fepriv->sem);
1957                 return -EPERM;
1958         }
1959
1960         err = dvb_frontend_handle_ioctl(file, cmd, parg);
1961
1962         up(&fepriv->sem);
1963         return err;
1964 }
1965
1966 static int dtv_set_frontend(struct dvb_frontend *fe)
1967 {
1968         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1969         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1970         struct dvb_frontend_tune_settings fetunesettings;
1971         u32 rolloff = 0;
1972
1973         if (dvb_frontend_check_parameters(fe) < 0)
1974                 return -EINVAL;
1975
1976         /*
1977          * Initialize output parameters to match the values given by
1978          * the user. FE_SET_FRONTEND triggers an initial frontend event
1979          * with status = 0, which copies output parameters to userspace.
1980          */
1981         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
1982
1983         /*
1984          * Be sure that the bandwidth will be filled for all
1985          * non-satellite systems, as tuners need to know what
1986          * low pass/Nyquist half filter should be applied, in
1987          * order to avoid inter-channel noise.
1988          *
1989          * ISDB-T and DVB-T/T2 already sets bandwidth.
1990          * ATSC and DVB-C don't set, so, the core should fill it.
1991          *
1992          * On DVB-C Annex A and C, the bandwidth is a function of
1993          * the roll-off and symbol rate. Annex B defines different
1994          * roll-off factors depending on the modulation. Fortunately,
1995          * Annex B is only used with 6MHz, so there's no need to
1996          * calculate it.
1997          *
1998          * While not officially supported, a side effect of handling it at
1999          * the cache level is that a program could retrieve the bandwidth
2000          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2001          */
2002         switch (c->delivery_system) {
2003         case SYS_ATSC:
2004         case SYS_DVBC_ANNEX_B:
2005                 c->bandwidth_hz = 6000000;
2006                 break;
2007         case SYS_DVBC_ANNEX_A:
2008                 rolloff = 115;
2009                 break;
2010         case SYS_DVBC_ANNEX_C:
2011                 rolloff = 113;
2012                 break;
2013         case SYS_DVBS:
2014         case SYS_TURBO:
2015         case SYS_ISDBS:
2016                 rolloff = 135;
2017                 break;
2018         case SYS_DVBS2:
2019                 switch (c->rolloff) {
2020                 case ROLLOFF_20:
2021                         rolloff = 120;
2022                         break;
2023                 case ROLLOFF_25:
2024                         rolloff = 125;
2025                         break;
2026                 default:
2027                 case ROLLOFF_35:
2028                         rolloff = 135;
2029                 }
2030                 break;
2031         default:
2032                 break;
2033         }
2034         if (rolloff)
2035                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2036
2037         /* force auto frequency inversion if requested */
2038         if (dvb_force_auto_inversion)
2039                 c->inversion = INVERSION_AUTO;
2040
2041         /*
2042          * without hierarchical coding code_rate_LP is irrelevant,
2043          * so we tolerate the otherwise invalid FEC_NONE setting
2044          */
2045         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2046                 c->code_rate_LP = FEC_AUTO;
2047
2048         /* get frontend-specific tuning settings */
2049         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2050         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2051                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2052                 fepriv->max_drift = fetunesettings.max_drift;
2053                 fepriv->step_size = fetunesettings.step_size;
2054         } else {
2055                 /* default values */
2056                 switch (c->delivery_system) {
2057                 case SYS_DVBS:
2058                 case SYS_DVBS2:
2059                 case SYS_ISDBS:
2060                 case SYS_TURBO:
2061                 case SYS_DVBC_ANNEX_A:
2062                 case SYS_DVBC_ANNEX_C:
2063                         fepriv->min_delay = HZ / 20;
2064                         fepriv->step_size = c->symbol_rate / 16000;
2065                         fepriv->max_drift = c->symbol_rate / 2000;
2066                         break;
2067                 case SYS_DVBT:
2068                 case SYS_DVBT2:
2069                 case SYS_ISDBT:
2070                 case SYS_DTMB:
2071                         fepriv->min_delay = HZ / 20;
2072                         fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
2073                         fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
2074                         break;
2075                 default:
2076                         /*
2077                          * FIXME: This sounds wrong! if freqency_stepsize is
2078                          * defined by the frontend, why not use it???
2079                          */
2080                         fepriv->min_delay = HZ / 20;
2081                         fepriv->step_size = 0; /* no zigzag */
2082                         fepriv->max_drift = 0;
2083                         break;
2084                 }
2085         }
2086         if (dvb_override_tune_delay > 0)
2087                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2088
2089         fepriv->state = FESTATE_RETUNE;
2090
2091         /* Request the search algorithm to search */
2092         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2093
2094         dvb_frontend_clear_events(fe);
2095         dvb_frontend_add_event(fe, 0);
2096         dvb_frontend_wakeup(fe);
2097         fepriv->status = 0;
2098
2099         return 0;
2100 }
2101
2102
2103 static int dvb_frontend_handle_ioctl(struct file *file,
2104                                      unsigned int cmd, void *parg)
2105 {
2106         struct dvb_device *dvbdev = file->private_data;
2107         struct dvb_frontend *fe = dvbdev->priv;
2108         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2109         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2110         int i, err;
2111
2112         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2113
2114         switch (cmd) {
2115         case FE_SET_PROPERTY: {
2116                 struct dtv_properties *tvps = parg;
2117                 struct dtv_property *tvp = NULL;
2118
2119                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2120                         __func__, tvps->num);
2121                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2122                         __func__, tvps->props);
2123
2124                 /*
2125                  * Put an arbitrary limit on the number of messages that can
2126                  * be sent at once
2127                  */
2128                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2129                         return -EINVAL;
2130
2131                 tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
2132                 if (IS_ERR(tvp))
2133                         return PTR_ERR(tvp);
2134
2135                 for (i = 0; i < tvps->num; i++) {
2136                         err = dtv_property_process_set(fe, file,
2137                                                         (tvp + i)->cmd,
2138                                                         (tvp + i)->u.data);
2139                         if (err < 0) {
2140                                 kfree(tvp);
2141                                 return err;
2142                         }
2143                 }
2144                 kfree(tvp);
2145                 break;
2146         }
2147         case FE_GET_PROPERTY: {
2148                 struct dtv_properties *tvps = parg;
2149                 struct dtv_property *tvp = NULL;
2150                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2151
2152                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2153                         __func__, tvps->num);
2154                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2155                         __func__, tvps->props);
2156
2157                 /*
2158                  * Put an arbitrary limit on the number of messages that can
2159                  * be sent at once
2160                  */
2161                 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2162                         return -EINVAL;
2163
2164                 tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
2165                 if (IS_ERR(tvp))
2166                         return PTR_ERR(tvp);
2167
2168                 /*
2169                  * Let's use our own copy of property cache, in order to
2170                  * avoid mangling with DTV zigzag logic, as drivers might
2171                  * return crap, if they don't check if the data is available
2172                  * before updating the properties cache.
2173                  */
2174                 if (fepriv->state != FESTATE_IDLE) {
2175                         err = dtv_get_frontend(fe, &getp, NULL);
2176                         if (err < 0) {
2177                                 kfree(tvp);
2178                                 return err;
2179                         }
2180                 }
2181                 for (i = 0; i < tvps->num; i++) {
2182                         err = dtv_property_process_get(fe, &getp,
2183                                                        tvp + i, file);
2184                         if (err < 0) {
2185                                 kfree(tvp);
2186                                 return err;
2187                         }
2188                 }
2189
2190                 if (copy_to_user((void __user *)tvps->props, tvp,
2191                                  tvps->num * sizeof(struct dtv_property))) {
2192                         kfree(tvp);
2193                         return -EFAULT;
2194                 }
2195                 kfree(tvp);
2196                 break;
2197         }
2198
2199         case FE_GET_INFO: {
2200                 struct dvb_frontend_info* info = parg;
2201
2202                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
2203                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);
2204
2205                 /*
2206                  * Associate the 4 delivery systems supported by DVBv3
2207                  * API with their DVBv5 counterpart. For the other standards,
2208                  * use the closest type, assuming that it would hopefully
2209                  * work with a DVBv3 application.
2210                  * It should be noticed that, on multi-frontend devices with
2211                  * different types (terrestrial and cable, for example),
2212                  * a pure DVBv3 application won't be able to use all delivery
2213                  * systems. Yet, changing the DVBv5 cache to the other delivery
2214                  * system should be enough for making it work.
2215                  */
2216                 switch (dvbv3_type(c->delivery_system)) {
2217                 case DVBV3_QPSK:
2218                         info->type = FE_QPSK;
2219                         break;
2220                 case DVBV3_ATSC:
2221                         info->type = FE_ATSC;
2222                         break;
2223                 case DVBV3_QAM:
2224                         info->type = FE_QAM;
2225                         break;
2226                 case DVBV3_OFDM:
2227                         info->type = FE_OFDM;
2228                         break;
2229                 default:
2230                         dev_err(fe->dvb->device,
2231                                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2232                                         __func__, c->delivery_system);
2233                         fe->ops.info.type = FE_OFDM;
2234                 }
2235                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2236                                  __func__, c->delivery_system, fe->ops.info.type);
2237
2238                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2239                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2240                         info->caps |= FE_CAN_INVERSION_AUTO;
2241                 err = 0;
2242                 break;
2243         }
2244
2245         case FE_READ_STATUS: {
2246                 enum fe_status *status = parg;
2247
2248                 /* if retune was requested but hasn't occurred yet, prevent
2249                  * that user get signal state from previous tuning */
2250                 if (fepriv->state == FESTATE_RETUNE ||
2251                     fepriv->state == FESTATE_ERROR) {
2252                         err=0;
2253                         *status = 0;
2254                         break;
2255                 }
2256
2257                 if (fe->ops.read_status)
2258                         err = fe->ops.read_status(fe, status);
2259                 break;
2260         }
2261
2262         case FE_DISEQC_RESET_OVERLOAD:
2263                 if (fe->ops.diseqc_reset_overload) {
2264                         err = fe->ops.diseqc_reset_overload(fe);
2265                         fepriv->state = FESTATE_DISEQC;
2266                         fepriv->status = 0;
2267                 }
2268                 break;
2269
2270         case FE_DISEQC_SEND_MASTER_CMD:
2271                 if (fe->ops.diseqc_send_master_cmd) {
2272                         struct dvb_diseqc_master_cmd *cmd = parg;
2273
2274                         if (cmd->msg_len > sizeof(cmd->msg)) {
2275                                 err = -EINVAL;
2276                                 break;
2277                         }
2278                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2279                         fepriv->state = FESTATE_DISEQC;
2280                         fepriv->status = 0;
2281                 }
2282                 break;
2283
2284         case FE_DISEQC_SEND_BURST:
2285                 if (fe->ops.diseqc_send_burst) {
2286                         err = fe->ops.diseqc_send_burst(fe,
2287                                                 (enum fe_sec_mini_cmd)parg);
2288                         fepriv->state = FESTATE_DISEQC;
2289                         fepriv->status = 0;
2290                 }
2291                 break;
2292
2293         case FE_SET_TONE:
2294                 if (fe->ops.set_tone) {
2295                         err = fe->ops.set_tone(fe,
2296                                                (enum fe_sec_tone_mode)parg);
2297                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2298                         fepriv->state = FESTATE_DISEQC;
2299                         fepriv->status = 0;
2300                 }
2301                 break;
2302
2303         case FE_SET_VOLTAGE:
2304                 if (fe->ops.set_voltage) {
2305                         err = fe->ops.set_voltage(fe,
2306                                                   (enum fe_sec_voltage)parg);
2307                         fepriv->voltage = (enum fe_sec_voltage)parg;
2308                         fepriv->state = FESTATE_DISEQC;
2309                         fepriv->status = 0;
2310                 }
2311                 break;
2312
2313         case FE_DISEQC_RECV_SLAVE_REPLY:
2314                 if (fe->ops.diseqc_recv_slave_reply)
2315                         err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2316                 break;
2317
2318         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2319                 if (fe->ops.enable_high_lnb_voltage)
2320                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
2321                 break;
2322
2323         case FE_SET_FRONTEND_TUNE_MODE:
2324                 fepriv->tune_mode_flags = (unsigned long) parg;
2325                 err = 0;
2326                 break;
2327
2328         /* DEPRECATED dish control ioctls */
2329
2330         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2331                 if (fe->ops.dishnetwork_send_legacy_command) {
2332                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2333                                                          (unsigned long)parg);
2334                         fepriv->state = FESTATE_DISEQC;
2335                         fepriv->status = 0;
2336                 } else if (fe->ops.set_voltage) {
2337                         /*
2338                          * NOTE: This is a fallback condition.  Some frontends
2339                          * (stv0299 for instance) take longer than 8msec to
2340                          * respond to a set_voltage command.  Those switches
2341                          * need custom routines to switch properly.  For all
2342                          * other frontends, the following should work ok.
2343                          * Dish network legacy switches (as used by Dish500)
2344                          * are controlled by sending 9-bit command words
2345                          * spaced 8msec apart.
2346                          * the actual command word is switch/port dependent
2347                          * so it is up to the userspace application to send
2348                          * the right command.
2349                          * The command must always start with a '0' after
2350                          * initialization, so parg is 8 bits and does not
2351                          * include the initialization or start bit
2352                          */
2353                         unsigned long swcmd = ((unsigned long) parg) << 1;
2354                         ktime_t nexttime;
2355                         ktime_t tv[10];
2356                         int i;
2357                         u8 last = 1;
2358                         if (dvb_frontend_debug)
2359                                 dprintk("%s switch command: 0x%04lx\n",
2360                                         __func__, swcmd);
2361                         nexttime = ktime_get_boottime();
2362                         if (dvb_frontend_debug)
2363                                 tv[0] = nexttime;
2364                         /* before sending a command, initialize by sending
2365                          * a 32ms 18V to the switch
2366                          */
2367                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2368                         dvb_frontend_sleep_until(&nexttime, 32000);
2369
2370                         for (i = 0; i < 9; i++) {
2371                                 if (dvb_frontend_debug)
2372                                         tv[i+1] = ktime_get_boottime();
2373                                 if ((swcmd & 0x01) != last) {
2374                                         /* set voltage to (last ? 13V : 18V) */
2375                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2376                                         last = (last) ? 0 : 1;
2377                                 }
2378                                 swcmd = swcmd >> 1;
2379                                 if (i != 8)
2380                                         dvb_frontend_sleep_until(&nexttime, 8000);
2381                         }
2382                         if (dvb_frontend_debug) {
2383                                 dprintk("%s(%d): switch delay (should be 32k followed by all 8k)\n",
2384                                         __func__, fe->dvb->num);
2385                                 for (i = 1; i < 10; i++)
2386                                         pr_info("%d: %d\n", i,
2387                                         (int) ktime_us_delta(tv[i], tv[i-1]));
2388                         }
2389                         err = 0;
2390                         fepriv->state = FESTATE_DISEQC;
2391                         fepriv->status = 0;
2392                 }
2393                 break;
2394
2395         /* DEPRECATED statistics ioctls */
2396
2397         case FE_READ_BER:
2398                 if (fe->ops.read_ber) {
2399                         if (fepriv->thread)
2400                                 err = fe->ops.read_ber(fe, parg);
2401                         else
2402                                 err = -EAGAIN;
2403                 }
2404                 break;
2405
2406         case FE_READ_SIGNAL_STRENGTH:
2407                 if (fe->ops.read_signal_strength) {
2408                         if (fepriv->thread)
2409                                 err = fe->ops.read_signal_strength(fe, parg);
2410                         else
2411                                 err = -EAGAIN;
2412                 }
2413                 break;
2414
2415         case FE_READ_SNR:
2416                 if (fe->ops.read_snr) {
2417                         if (fepriv->thread)
2418                                 err = fe->ops.read_snr(fe, parg);
2419                         else
2420                                 err = -EAGAIN;
2421                 }
2422                 break;
2423
2424         case FE_READ_UNCORRECTED_BLOCKS:
2425                 if (fe->ops.read_ucblocks) {
2426                         if (fepriv->thread)
2427                                 err = fe->ops.read_ucblocks(fe, parg);
2428                         else
2429                                 err = -EAGAIN;
2430                 }
2431                 break;
2432
2433         /* DEPRECATED DVBv3 ioctls */
2434
2435         case FE_SET_FRONTEND:
2436                 err = dvbv3_set_delivery_system(fe);
2437                 if (err)
2438                         break;
2439
2440                 err = dtv_property_cache_sync(fe, c, parg);
2441                 if (err)
2442                         break;
2443                 err = dtv_set_frontend(fe);
2444                 break;
2445         case FE_GET_EVENT:
2446                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
2447                 break;
2448
2449         case FE_GET_FRONTEND: {
2450                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2451
2452                 /*
2453                  * Let's use our own copy of property cache, in order to
2454                  * avoid mangling with DTV zigzag logic, as drivers might
2455                  * return crap, if they don't check if the data is available
2456                  * before updating the properties cache.
2457                  */
2458                 err = dtv_get_frontend(fe, &getp, parg);
2459                 break;
2460         }
2461
2462         default:
2463                 return -ENOTSUPP;
2464         } /* switch */
2465
2466         return err;
2467 }
2468
2469
2470 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2471 {
2472         struct dvb_device *dvbdev = file->private_data;
2473         struct dvb_frontend *fe = dvbdev->priv;
2474         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2475
2476         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2477
2478         poll_wait (file, &fepriv->events.wait_queue, wait);
2479
2480         if (fepriv->events.eventw != fepriv->events.eventr)
2481                 return (POLLIN | POLLRDNORM | POLLPRI);
2482
2483         return 0;
2484 }
2485
2486 static int dvb_frontend_open(struct inode *inode, struct file *file)
2487 {
2488         struct dvb_device *dvbdev = file->private_data;
2489         struct dvb_frontend *fe = dvbdev->priv;
2490         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2491         struct dvb_adapter *adapter = fe->dvb;
2492         int ret;
2493
2494         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2495         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2496                 return -ENODEV;
2497
2498         if (adapter->mfe_shared) {
2499                 mutex_lock (&adapter->mfe_lock);
2500
2501                 if (adapter->mfe_dvbdev == NULL)
2502                         adapter->mfe_dvbdev = dvbdev;
2503
2504                 else if (adapter->mfe_dvbdev != dvbdev) {
2505                         struct dvb_device
2506                                 *mfedev = adapter->mfe_dvbdev;
2507                         struct dvb_frontend
2508                                 *mfe = mfedev->priv;
2509                         struct dvb_frontend_private
2510                                 *mfepriv = mfe->frontend_priv;
2511                         int mferetry = (dvb_mfe_wait_time << 1);
2512
2513                         mutex_unlock (&adapter->mfe_lock);
2514                         while (mferetry-- && (mfedev->users != -1 ||
2515                                         mfepriv->thread != NULL)) {
2516                                 if(msleep_interruptible(500)) {
2517                                         if(signal_pending(current))
2518                                                 return -EINTR;
2519                                 }
2520                         }
2521
2522                         mutex_lock (&adapter->mfe_lock);
2523                         if(adapter->mfe_dvbdev != dvbdev) {
2524                                 mfedev = adapter->mfe_dvbdev;
2525                                 mfe = mfedev->priv;
2526                                 mfepriv = mfe->frontend_priv;
2527                                 if (mfedev->users != -1 ||
2528                                                 mfepriv->thread != NULL) {
2529                                         mutex_unlock (&adapter->mfe_lock);
2530                                         return -EBUSY;
2531                                 }
2532                                 adapter->mfe_dvbdev = dvbdev;
2533                         }
2534                 }
2535         }
2536
2537         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2538                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2539                         goto err0;
2540
2541                 /* If we took control of the bus, we need to force
2542                    reinitialization.  This is because many ts_bus_ctrl()
2543                    functions strobe the RESET pin on the demod, and if the
2544                    frontend thread already exists then the dvb_init() routine
2545                    won't get called (which is what usually does initial
2546                    register configuration). */
2547                 fepriv->reinitialise = 1;
2548         }
2549
2550         if ((ret = dvb_generic_open (inode, file)) < 0)
2551                 goto err1;
2552
2553         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2554                 /* normal tune mode when opened R/W */
2555                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2556                 fepriv->tone = -1;
2557                 fepriv->voltage = -1;
2558
2559 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2560                 if (fe->dvb->mdev) {
2561                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2562                         if (fe->dvb->mdev->enable_source)
2563                                 ret = fe->dvb->mdev->enable_source(
2564                                                            dvbdev->entity,
2565                                                            &fepriv->pipe);
2566                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2567                         if (ret) {
2568                                 dev_err(fe->dvb->device,
2569                                         "Tuner is busy. Error %d\n", ret);
2570                                 goto err2;
2571                         }
2572                 }
2573 #endif
2574                 ret = dvb_frontend_start (fe);
2575                 if (ret)
2576                         goto err3;
2577
2578                 /*  empty event queue */
2579                 fepriv->events.eventr = fepriv->events.eventw = 0;
2580         }
2581
2582         dvb_frontend_get(fe);
2583
2584         if (adapter->mfe_shared)
2585                 mutex_unlock (&adapter->mfe_lock);
2586         return ret;
2587
2588 err3:
2589 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2590         if (fe->dvb->mdev) {
2591                 mutex_lock(&fe->dvb->mdev->graph_mutex);
2592                 if (fe->dvb->mdev->disable_source)
2593                         fe->dvb->mdev->disable_source(dvbdev->entity);
2594                 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2595         }
2596 err2:
2597 #endif
2598         dvb_generic_release(inode, file);
2599 err1:
2600         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2601                 fe->ops.ts_bus_ctrl(fe, 0);
2602 err0:
2603         if (adapter->mfe_shared)
2604                 mutex_unlock (&adapter->mfe_lock);
2605         return ret;
2606 }
2607
2608 static int dvb_frontend_release(struct inode *inode, struct file *file)
2609 {
2610         struct dvb_device *dvbdev = file->private_data;
2611         struct dvb_frontend *fe = dvbdev->priv;
2612         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2613         int ret;
2614
2615         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2616
2617         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2618                 fepriv->release_jiffies = jiffies;
2619                 mb();
2620         }
2621
2622         ret = dvb_generic_release (inode, file);
2623
2624         if (dvbdev->users == -1) {
2625                 wake_up(&fepriv->wait_queue);
2626 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2627                 if (fe->dvb->mdev) {
2628                         mutex_lock(&fe->dvb->mdev->graph_mutex);
2629                         if (fe->dvb->mdev->disable_source)
2630                                 fe->dvb->mdev->disable_source(dvbdev->entity);
2631                         mutex_unlock(&fe->dvb->mdev->graph_mutex);
2632                 }
2633 #endif
2634                 if (fe->exit != DVB_FE_NO_EXIT)
2635                         wake_up(&dvbdev->wait_queue);
2636                 if (fe->ops.ts_bus_ctrl)
2637                         fe->ops.ts_bus_ctrl(fe, 0);
2638         }
2639
2640         dvb_frontend_put(fe);
2641
2642         return ret;
2643 }
2644
2645 static const struct file_operations dvb_frontend_fops = {
2646         .owner          = THIS_MODULE,
2647         .unlocked_ioctl = dvb_generic_ioctl,
2648         .poll           = dvb_frontend_poll,
2649         .open           = dvb_frontend_open,
2650         .release        = dvb_frontend_release,
2651         .llseek         = noop_llseek,
2652 };
2653
2654 int dvb_frontend_suspend(struct dvb_frontend *fe)
2655 {
2656         int ret = 0;
2657
2658         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2659                         fe->id);
2660
2661         if (fe->ops.tuner_ops.suspend)
2662                 ret = fe->ops.tuner_ops.suspend(fe);
2663         else if (fe->ops.tuner_ops.sleep)
2664                 ret = fe->ops.tuner_ops.sleep(fe);
2665
2666         if (fe->ops.sleep)
2667                 ret = fe->ops.sleep(fe);
2668
2669         return ret;
2670 }
2671 EXPORT_SYMBOL(dvb_frontend_suspend);
2672
2673 int dvb_frontend_resume(struct dvb_frontend *fe)
2674 {
2675         struct dvb_frontend_private *fepriv = fe->frontend_priv;
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         fe->exit = DVB_FE_DEVICE_RESUME;
2682         if (fe->ops.init)
2683                 ret = fe->ops.init(fe);
2684
2685         if (fe->ops.tuner_ops.resume)
2686                 ret = fe->ops.tuner_ops.resume(fe);
2687         else if (fe->ops.tuner_ops.init)
2688                 ret = fe->ops.tuner_ops.init(fe);
2689
2690         if (fe->ops.set_tone && fepriv->tone != -1)
2691                 fe->ops.set_tone(fe, fepriv->tone);
2692         if (fe->ops.set_voltage && fepriv->voltage != -1)
2693                 fe->ops.set_voltage(fe, fepriv->voltage);
2694
2695         fe->exit = DVB_FE_NO_EXIT;
2696         fepriv->state = FESTATE_RETUNE;
2697         dvb_frontend_wakeup(fe);
2698
2699         return ret;
2700 }
2701 EXPORT_SYMBOL(dvb_frontend_resume);
2702
2703 int dvb_register_frontend(struct dvb_adapter* dvb,
2704                           struct dvb_frontend* fe)
2705 {
2706         struct dvb_frontend_private *fepriv;
2707         const struct dvb_device dvbdev_template = {
2708                 .users = ~0,
2709                 .writers = 1,
2710                 .readers = (~0)-1,
2711                 .fops = &dvb_frontend_fops,
2712 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2713                 .name = fe->ops.info.name,
2714 #endif
2715                 .kernel_ioctl = dvb_frontend_ioctl
2716         };
2717
2718         dev_dbg(dvb->device, "%s:\n", __func__);
2719
2720         if (mutex_lock_interruptible(&frontend_mutex))
2721                 return -ERESTARTSYS;
2722
2723         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2724         if (fe->frontend_priv == NULL) {
2725                 mutex_unlock(&frontend_mutex);
2726                 return -ENOMEM;
2727         }
2728         fepriv = fe->frontend_priv;
2729
2730         kref_init(&fe->refcount);
2731
2732         /*
2733          * After initialization, there need to be two references: one
2734          * for dvb_unregister_frontend(), and another one for
2735          * dvb_frontend_detach().
2736          */
2737         dvb_frontend_get(fe);
2738
2739         sema_init(&fepriv->sem, 1);
2740         init_waitqueue_head (&fepriv->wait_queue);
2741         init_waitqueue_head (&fepriv->events.wait_queue);
2742         mutex_init(&fepriv->events.mtx);
2743         fe->dvb = dvb;
2744         fepriv->inversion = INVERSION_OFF;
2745
2746         dev_info(fe->dvb->device,
2747                         "DVB: registering adapter %i frontend %i (%s)...\n",
2748                         fe->dvb->num, fe->id, fe->ops.info.name);
2749
2750         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2751                              fe, DVB_DEVICE_FRONTEND, 0);
2752
2753         /*
2754          * Initialize the cache to the proper values according with the
2755          * first supported delivery system (ops->delsys[0])
2756          */
2757
2758         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
2759         dvb_frontend_clear_cache(fe);
2760
2761         mutex_unlock(&frontend_mutex);
2762         return 0;
2763 }
2764 EXPORT_SYMBOL(dvb_register_frontend);
2765
2766 int dvb_unregister_frontend(struct dvb_frontend* fe)
2767 {
2768         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2769         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2770
2771         mutex_lock(&frontend_mutex);
2772         dvb_frontend_stop(fe);
2773         dvb_remove_device(fepriv->dvbdev);
2774
2775         /* fe is invalid now */
2776         mutex_unlock(&frontend_mutex);
2777         dvb_frontend_put(fe);
2778         return 0;
2779 }
2780 EXPORT_SYMBOL(dvb_unregister_frontend);
2781
2782 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
2783                                         void (*release)(struct dvb_frontend *fe))
2784 {
2785         if (release) {
2786                 release(fe);
2787 #ifdef CONFIG_MEDIA_ATTACH
2788                 dvb_detach(release);
2789 #endif
2790         }
2791 }
2792
2793 void dvb_frontend_detach(struct dvb_frontend* fe)
2794 {
2795         dvb_frontend_invoke_release(fe, fe->ops.release_sec);
2796         dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
2797         dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
2798         dvb_frontend_invoke_release(fe, fe->ops.detach);
2799         dvb_frontend_put(fe);
2800 }
2801 EXPORT_SYMBOL(dvb_frontend_detach);