drivers/media/dvb-core/dvb_frontend.c

   1 /*
   2  * dvb_frontend.c: DVB frontend tuning interface/thread
   3  *
   4  *
   5  * Copyright (C) 1999-2001 Ralph  Metzler
   6  *                         Marcus Metzler
   7  *                         Holger Waechtler
   8  *                                    for convergence integrated media GmbH
   9  *
  10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  26  */
  27
  28 /* Enables DVBv3 compatibility bits at the headers */
  29 #define __DVB_CORE__
  30
  31 #include <linux/string.h>
  32 #include <linux/kernel.h>
  33 #include <linux/sched.h>
  34 #include <linux/wait.h>
  35 #include <linux/slab.h>
  36 #include <linux/poll.h>
  37 #include <linux/semaphore.h>
  38 #include <linux/module.h>
  39 #include <linux/list.h>
  40 #include <linux/freezer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kthread.h>
  43 #include <linux/ktime.h>
  44 #include <asm/processor.h>
  45
  46 #include "dvb_frontend.h"
  47 #include "dvbdev.h"
  48 #include <linux/dvb/version.h>
  49
  50 static int dvb_frontend_debug;
  51 static int dvb_shutdown_timeout;
  52 static int dvb_force_auto_inversion;
  53 static int dvb_override_tune_delay;
  54 static int dvb_powerdown_on_sleep = 1;
  55 static int dvb_mfe_wait_time = 5;
  56
  57 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  58 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  59 module_param(dvb_shutdown_timeout, int, 0644);
  60 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  61 module_param(dvb_force_auto_inversion, int, 0644);
  62 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  63 module_param(dvb_override_tune_delay, int, 0644);
  64 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  65 module_param(dvb_powerdown_on_sleep, int, 0644);
  66 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  67 module_param(dvb_mfe_wait_time, int, 0644);
  68 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  69
  70 #define FESTATE_IDLE 1
  71 #define FESTATE_RETUNE 2
  72 #define FESTATE_TUNING_FAST 4
  73 #define FESTATE_TUNING_SLOW 8
  74 #define FESTATE_TUNED 16
  75 #define FESTATE_ZIGZAG_FAST 32
  76 #define FESTATE_ZIGZAG_SLOW 64
  77 #define FESTATE_DISEQC 128
  78 #define FESTATE_ERROR 256
  79 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  80 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  81 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  82 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  83
  84 /*
  85  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
  86  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
  87  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
  88  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
  89  * FESTATE_TUNED. The frontend has successfully locked on.
  90  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
  91  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
  92  * FESTATE_DISEQC. A DISEQC command has just been issued.
  93  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
  94  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
  95  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
  96  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
  97  */
  98
  99 static DEFINE_MUTEX(frontend_mutex);
 100
 101 struct dvb_frontend_private {
 102
 103         /* thread/frontend values */
 104         struct dvb_device *dvbdev;
 105         struct dvb_frontend_parameters parameters_out;
 106         struct dvb_fe_events events;
 107         struct semaphore sem;
 108         struct list_head list_head;
 109         wait_queue_head_t wait_queue;
 110         struct task_struct *thread;
 111         unsigned long release_jiffies;
 112         unsigned int wakeup;
 113         enum fe_status status;
 114         unsigned long tune_mode_flags;
 115         unsigned int delay;
 116         unsigned int reinitialise;
 117         int tone;
 118         int voltage;
 119
 120         /* swzigzag values */
 121         unsigned int state;
 122         unsigned int bending;
 123         int lnb_drift;
 124         unsigned int inversion;
 125         unsigned int auto_step;
 126         unsigned int auto_sub_step;
 127         unsigned int started_auto_step;
 128         unsigned int min_delay;
 129         unsigned int max_drift;
 130         unsigned int step_size;
 131         int quality;
 132         unsigned int check_wrapped;
 133         enum dvbfe_search algo_status;
 134
 135 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 136         struct media_pipeline pipe;
 137 #endif
 138 };
 139
 140 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 141 static int dtv_get_frontend(struct dvb_frontend *fe,
 142                             struct dtv_frontend_properties *c,
 143                             struct dvb_frontend_parameters *p_out);
 144 static int
 145 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 146                                 const struct dtv_frontend_properties *c,
 147                                 struct dvb_frontend_parameters *p);
 148
 149 static bool has_get_frontend(struct dvb_frontend *fe)
 150 {
 151         return fe->ops.get_frontend != NULL;
 152 }
 153
 154 /*
 155  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 156  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 157  * otherwise, a DVBv3 call will fail.
 158  */
 159 enum dvbv3_emulation_type {
 160         DVBV3_UNKNOWN,
 161         DVBV3_QPSK,
 162         DVBV3_QAM,
 163         DVBV3_OFDM,
 164         DVBV3_ATSC,
 165 };
 166
 167 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 168 {
 169         switch (delivery_system) {
 170         case SYS_DVBC_ANNEX_A:
 171         case SYS_DVBC_ANNEX_C:
 172                 return DVBV3_QAM;
 173         case SYS_DVBS:
 174         case SYS_DVBS2:
 175         case SYS_TURBO:
 176         case SYS_ISDBS:
 177         case SYS_DSS:
 178                 return DVBV3_QPSK;
 179         case SYS_DVBT:
 180         case SYS_DVBT2:
 181         case SYS_ISDBT:
 182         case SYS_DTMB:
 183                 return DVBV3_OFDM;
 184         case SYS_ATSC:
 185         case SYS_ATSCMH:
 186         case SYS_DVBC_ANNEX_B:
 187                 return DVBV3_ATSC;
 188         case SYS_UNDEFINED:
 189         case SYS_ISDBC:
 190         case SYS_DVBH:
 191         case SYS_DAB:
 192         default:
 193                 /*
 194                  * Doesn't know how to emulate those types and/or
 195                  * there's no frontend driver from this type yet
 196                  * with some emulation code, so, we're not sure yet how
 197                  * to handle them, or they're not compatible with a DVBv3 call.
 198                  */
 199                 return DVBV3_UNKNOWN;
 200         }
 201 }
 202
 203 static void dvb_frontend_add_event(struct dvb_frontend *fe,
 204                                    enum fe_status status)
 205 {
 206         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 207         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 208         struct dvb_fe_events *events = &fepriv->events;
 209         struct dvb_frontend_event *e;
 210         int wp;
 211
 212         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 213
 214         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 215                 dtv_get_frontend(fe, c, &fepriv->parameters_out);
 216
 217         mutex_lock(&events->mtx);
 218
 219         wp = (events->eventw + 1) % MAX_EVENT;
 220         if (wp == events->eventr) {
 221                 events->overflow = 1;
 222                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 223         }
 224
 225         e = &events->events[events->eventw];
 226         e->status = status;
 227         e->parameters = fepriv->parameters_out;
 228
 229         events->eventw = wp;
 230
 231         mutex_unlock(&events->mtx);
 232
 233         wake_up_interruptible (&events->wait_queue);
 234 }
 235
 236 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 237                             struct dvb_frontend_event *event, int flags)
 238 {
 239         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 240         struct dvb_fe_events *events = &fepriv->events;
 241
 242         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 243
 244         if (events->overflow) {
 245                 events->overflow = 0;
 246                 return -EOVERFLOW;
 247         }
 248
 249         if (events->eventw == events->eventr) {
 250                 int ret;
 251
 252                 if (flags & O_NONBLOCK)
 253                         return -EWOULDBLOCK;
 254
 255                 up(&fepriv->sem);
 256
 257                 ret = wait_event_interruptible (events->wait_queue,
 258                                                 events->eventw != events->eventr);
 259
 260                 if (down_interruptible (&fepriv->sem))
 261                         return -ERESTARTSYS;
 262
 263                 if (ret < 0)
 264                         return ret;
 265         }
 266
 267         mutex_lock(&events->mtx);
 268         *event = events->events[events->eventr];
 269         events->eventr = (events->eventr + 1) % MAX_EVENT;
 270         mutex_unlock(&events->mtx);
 271
 272         return 0;
 273 }
 274
 275 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 276 {
 277         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 278         struct dvb_fe_events *events = &fepriv->events;
 279
 280         mutex_lock(&events->mtx);
 281         events->eventr = events->eventw;
 282         mutex_unlock(&events->mtx);
 283 }
 284
 285 static void dvb_frontend_init(struct dvb_frontend *fe)
 286 {
 287         dev_dbg(fe->dvb->device,
 288                         "%s: initialising adapter %i frontend %i (%s)...\n",
 289                         __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 290
 291         if (fe->ops.init)
 292                 fe->ops.init(fe);
 293         if (fe->ops.tuner_ops.init) {
 294                 if (fe->ops.i2c_gate_ctrl)
 295                         fe->ops.i2c_gate_ctrl(fe, 1);
 296                 fe->ops.tuner_ops.init(fe);
 297                 if (fe->ops.i2c_gate_ctrl)
 298                         fe->ops.i2c_gate_ctrl(fe, 0);
 299         }
 300 }
 301
 302 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 303 {
 304         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 305
 306         fepriv->reinitialise = 1;
 307         dvb_frontend_wakeup(fe);
 308 }
 309 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 310
 311 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 312 {
 313         int q2;
 314         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 315
 316         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 317
 318         if (locked)
 319                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 320         else
 321                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 322
 323         q2 = fepriv->quality - 128;
 324         q2 *= q2;
 325
 326         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 327 }
 328
 329 /**
 330  * Performs automatic twiddling of frontend parameters.
 331  *
 332  * @param fe The frontend concerned.
 333  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 334  * @returns Number of complete iterations that have been performed.
 335  */
 336 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 337 {
 338         int autoinversion;
 339         int ready = 0;
 340         int fe_set_err = 0;
 341         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 342         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 343         int original_inversion = c->inversion;
 344         u32 original_frequency = c->frequency;
 345
 346         /* are we using autoinversion? */
 347         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 348                          (c->inversion == INVERSION_AUTO));
 349
 350         /* setup parameters correctly */
 351         while(!ready) {
 352                 /* calculate the lnb_drift */
 353                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 354
 355                 /* wrap the auto_step if we've exceeded the maximum drift */
 356                 if (fepriv->lnb_drift > fepriv->max_drift) {
 357                         fepriv->auto_step = 0;
 358                         fepriv->auto_sub_step = 0;
 359                         fepriv->lnb_drift = 0;
 360                 }
 361
 362                 /* perform inversion and +/- zigzag */
 363                 switch(fepriv->auto_sub_step) {
 364                 case 0:
 365                         /* try with the current inversion and current drift setting */
 366                         ready = 1;
 367                         break;
 368
 369                 case 1:
 370                         if (!autoinversion) break;
 371
 372                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 373                         ready = 1;
 374                         break;
 375
 376                 case 2:
 377                         if (fepriv->lnb_drift == 0) break;
 378
 379                         fepriv->lnb_drift = -fepriv->lnb_drift;
 380                         ready = 1;
 381                         break;
 382
 383                 case 3:
 384                         if (fepriv->lnb_drift == 0) break;
 385                         if (!autoinversion) break;
 386
 387                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 388                         fepriv->lnb_drift = -fepriv->lnb_drift;
 389                         ready = 1;
 390                         break;
 391
 392                 default:
 393                         fepriv->auto_step++;
 394                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 395                         break;
 396                 }
 397
 398                 if (!ready) fepriv->auto_sub_step++;
 399         }
 400
 401         /* if this attempt would hit where we started, indicate a complete
 402          * iteration has occurred */
 403         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 404             (fepriv->auto_sub_step == 0) && check_wrapped) {
 405                 return 1;
 406         }
 407
 408         dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \
 409                         "auto_sub_step:%i started_auto_step:%i\n",
 410                         __func__, fepriv->lnb_drift, fepriv->inversion,
 411                         fepriv->auto_step, fepriv->auto_sub_step,
 412                         fepriv->started_auto_step);
 413
 414         /* set the frontend itself */
 415         c->frequency += fepriv->lnb_drift;
 416         if (autoinversion)
 417                 c->inversion = fepriv->inversion;
 418         tmp = *c;
 419         if (fe->ops.set_frontend)
 420                 fe_set_err = fe->ops.set_frontend(fe);
 421         *c = tmp;
 422         if (fe_set_err < 0) {
 423                 fepriv->state = FESTATE_ERROR;
 424                 return fe_set_err;
 425         }
 426
 427         c->frequency = original_frequency;
 428         c->inversion = original_inversion;
 429
 430         fepriv->auto_sub_step++;
 431         return 0;
 432 }
 433
 434 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 435 {
 436         enum fe_status s = 0;
 437         int retval = 0;
 438         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 439         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 440
 441         /* if we've got no parameters, just keep idling */
 442         if (fepriv->state & FESTATE_IDLE) {
 443                 fepriv->delay = 3*HZ;
 444                 fepriv->quality = 0;
 445                 return;
 446         }
 447
 448         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 449         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 450                 if (fepriv->state & FESTATE_RETUNE) {
 451                         tmp = *c;
 452                         if (fe->ops.set_frontend)
 453                                 retval = fe->ops.set_frontend(fe);
 454                         *c = tmp;
 455                         if (retval < 0)
 456                                 fepriv->state = FESTATE_ERROR;
 457                         else
 458                                 fepriv->state = FESTATE_TUNED;
 459                 }
 460                 fepriv->delay = 3*HZ;
 461                 fepriv->quality = 0;
 462                 return;
 463         }
 464
 465         /* get the frontend status */
 466         if (fepriv->state & FESTATE_RETUNE) {
 467                 s = 0;
 468         } else {
 469                 if (fe->ops.read_status)
 470                         fe->ops.read_status(fe, &s);
 471                 if (s != fepriv->status) {
 472                         dvb_frontend_add_event(fe, s);
 473                         fepriv->status = s;
 474                 }
 475         }
 476
 477         /* if we're not tuned, and we have a lock, move to the TUNED state */
 478         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 479                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 480                 fepriv->state = FESTATE_TUNED;
 481
 482                 /* if we're tuned, then we have determined the correct inversion */
 483                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 484                     (c->inversion == INVERSION_AUTO)) {
 485                         c->inversion = fepriv->inversion;
 486                 }
 487                 return;
 488         }
 489
 490         /* if we are tuned already, check we're still locked */
 491         if (fepriv->state & FESTATE_TUNED) {
 492                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 493
 494                 /* we're tuned, and the lock is still good... */
 495                 if (s & FE_HAS_LOCK) {
 496                         return;
 497                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 498                         fepriv->state = FESTATE_ZIGZAG_FAST;
 499                         fepriv->started_auto_step = fepriv->auto_step;
 500                         fepriv->check_wrapped = 0;
 501                 }
 502         }
 503
 504         /* don't actually do anything if we're in the LOSTLOCK state,
 505          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 506         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 507             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 508                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 509                 return;
 510         }
 511
 512         /* don't do anything if we're in the DISEQC state, since this
 513          * might be someone with a motorized dish controlled by DISEQC.
 514          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 515         if (fepriv->state & FESTATE_DISEQC) {
 516                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 517                 return;
 518         }
 519
 520         /* if we're in the RETUNE state, set everything up for a brand
 521          * new scan, keeping the current inversion setting, as the next
 522          * tune is _very_ likely to require the same */
 523         if (fepriv->state & FESTATE_RETUNE) {
 524                 fepriv->lnb_drift = 0;
 525                 fepriv->auto_step = 0;
 526                 fepriv->auto_sub_step = 0;
 527                 fepriv->started_auto_step = 0;
 528                 fepriv->check_wrapped = 0;
 529         }
 530
 531         /* fast zigzag. */
 532         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 533                 fepriv->delay = fepriv->min_delay;
 534
 535                 /* perform a tune */
 536                 retval = dvb_frontend_swzigzag_autotune(fe,
 537                                                         fepriv->check_wrapped);
 538                 if (retval < 0) {
 539                         return;
 540                 } else if (retval) {
 541                         /* OK, if we've run out of trials at the fast speed.
 542                          * Drop back to slow for the _next_ attempt */
 543                         fepriv->state = FESTATE_SEARCHING_SLOW;
 544                         fepriv->started_auto_step = fepriv->auto_step;
 545                         return;
 546                 }
 547                 fepriv->check_wrapped = 1;
 548
 549                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 550                  * This ensures we cannot return from an
 551                  * FE_SET_FRONTEND ioctl before the first frontend tune
 552                  * occurs */
 553                 if (fepriv->state & FESTATE_RETUNE) {
 554                         fepriv->state = FESTATE_TUNING_FAST;
 555                 }
 556         }
 557
 558         /* slow zigzag */
 559         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 560                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 561
 562                 /* Note: don't bother checking for wrapping; we stay in this
 563                  * state until we get a lock */
 564                 dvb_frontend_swzigzag_autotune(fe, 0);
 565         }
 566 }
 567
 568 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 569 {
 570         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 571
 572         if (fe->exit != DVB_FE_NO_EXIT)
 573                 return 1;
 574
 575         if (fepriv->dvbdev->writers == 1)
 576                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 577                                   dvb_shutdown_timeout * HZ))
 578                         return 1;
 579
 580         return 0;
 581 }
 582
 583 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 584 {
 585         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 586
 587         if (fepriv->wakeup) {
 588                 fepriv->wakeup = 0;
 589                 return 1;
 590         }
 591         return dvb_frontend_is_exiting(fe);
 592 }
 593
 594 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 595 {
 596         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 597
 598         fepriv->wakeup = 1;
 599         wake_up_interruptible(&fepriv->wait_queue);
 600 }
 601
 602 static int dvb_frontend_thread(void *data)
 603 {
 604         struct dvb_frontend *fe = data;
 605         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 606         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 607         enum fe_status s;
 608         enum dvbfe_algo algo;
 609         bool re_tune = false;
 610         bool semheld = false;
 611
 612         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 613
 614         fepriv->check_wrapped = 0;
 615         fepriv->quality = 0;
 616         fepriv->delay = 3*HZ;
 617         fepriv->status = 0;
 618         fepriv->wakeup = 0;
 619         fepriv->reinitialise = 0;
 620
 621         dvb_frontend_init(fe);
 622
 623         set_freezable();
 624         while (1) {
 625                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 626 restart:
 627                 wait_event_interruptible_timeout(fepriv->wait_queue,
 628                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
 629                                 || freezing(current),
 630                         fepriv->delay);
 631
 632                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 633                         /* got signal or quitting */
 634                         if (!down_interruptible(&fepriv->sem))
 635                                 semheld = true;
 636                         fe->exit = DVB_FE_NORMAL_EXIT;
 637                         break;
 638                 }
 639
 640                 if (try_to_freeze())
 641                         goto restart;
 642
 643                 if (down_interruptible(&fepriv->sem))
 644                         break;
 645
 646                 if (fepriv->reinitialise) {
 647                         dvb_frontend_init(fe);
 648                         if (fe->ops.set_tone && fepriv->tone != -1)
 649                                 fe->ops.set_tone(fe, fepriv->tone);
 650                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 651                                 fe->ops.set_voltage(fe, fepriv->voltage);
 652                         fepriv->reinitialise = 0;
 653                 }
 654
 655                 /* do an iteration of the tuning loop */
 656                 if (fe->ops.get_frontend_algo) {
 657                         algo = fe->ops.get_frontend_algo(fe);
 658                         switch (algo) {
 659                         case DVBFE_ALGO_HW:
 660                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 661
 662                                 if (fepriv->state & FESTATE_RETUNE) {
 663                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 664                                         re_tune = true;
 665                                         fepriv->state = FESTATE_TUNED;
 666                                 } else {
 667                                         re_tune = false;
 668                                 }
 669
 670                                 if (fe->ops.tune)
 671                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 672
 673                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 674                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 675                                         dvb_frontend_add_event(fe, s);
 676                                         fepriv->status = s;
 677                                 }
 678                                 break;
 679                         case DVBFE_ALGO_SW:
 680                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 681                                 dvb_frontend_swzigzag(fe);
 682                                 break;
 683                         case DVBFE_ALGO_CUSTOM:
 684                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 685                                 if (fepriv->state & FESTATE_RETUNE) {
 686                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 687                                         fepriv->state = FESTATE_TUNED;
 688                                 }
 689                                 /* Case where we are going to search for a carrier
 690                                  * User asked us to retune again for some reason, possibly
 691                                  * requesting a search with a new set of parameters
 692                                  */
 693                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 694                                         if (fe->ops.search) {
 695                                                 fepriv->algo_status = fe->ops.search(fe);
 696                                                 /* We did do a search as was requested, the flags are
 697                                                  * now unset as well and has the flags wrt to search.
 698                                                  */
 699                                         } else {
 700                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 701                                         }
 702                                 }
 703                                 /* Track the carrier if the search was successful */
 704                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 705                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 706                                         fepriv->delay = HZ / 2;
 707                                 }
 708                                 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
 709                                 fe->ops.read_status(fe, &s);
 710                                 if (s != fepriv->status) {
 711                                         dvb_frontend_add_event(fe, s); /* update event list */
 712                                         fepriv->status = s;
 713                                         if (!(s & FE_HAS_LOCK)) {
 714                                                 fepriv->delay = HZ / 10;
 715                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 716                                         } else {
 717                                                 fepriv->delay = 60 * HZ;
 718                                         }
 719                                 }
 720                                 break;
 721                         default:
 722                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 723                                 break;
 724                         }
 725                 } else {
 726                         dvb_frontend_swzigzag(fe);
 727                 }
 728         }
 729
 730         if (dvb_powerdown_on_sleep) {
 731                 if (fe->ops.set_voltage)
 732                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 733                 if (fe->ops.tuner_ops.sleep) {
 734                         if (fe->ops.i2c_gate_ctrl)
 735                                 fe->ops.i2c_gate_ctrl(fe, 1);
 736                         fe->ops.tuner_ops.sleep(fe);
 737                         if (fe->ops.i2c_gate_ctrl)
 738                                 fe->ops.i2c_gate_ctrl(fe, 0);
 739                 }
 740                 if (fe->ops.sleep)
 741                         fe->ops.sleep(fe);
 742         }
 743
 744         fepriv->thread = NULL;
 745         if (kthread_should_stop())
 746                 fe->exit = DVB_FE_DEVICE_REMOVED;
 747         else
 748                 fe->exit = DVB_FE_NO_EXIT;
 749         mb();
 750
 751         if (semheld)
 752                 up(&fepriv->sem);
 753         dvb_frontend_wakeup(fe);
 754         return 0;
 755 }
 756
 757 static void dvb_frontend_stop(struct dvb_frontend *fe)
 758 {
 759         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 760
 761         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 762
 763         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 764                 fe->exit = DVB_FE_NORMAL_EXIT;
 765         mb();
 766
 767         if (!fepriv->thread)
 768                 return;
 769
 770         kthread_stop(fepriv->thread);
 771
 772         sema_init(&fepriv->sem, 1);
 773         fepriv->state = FESTATE_IDLE;
 774
 775         /* paranoia check in case a signal arrived */
 776         if (fepriv->thread)
 777                 dev_warn(fe->dvb->device,
 778                                 "dvb_frontend_stop: warning: thread %p won't exit\n",
 779                                 fepriv->thread);
 780 }
 781
 782 /*
 783  * Sleep for the amount of time given by add_usec parameter
 784  *
 785  * This needs to be as precise as possible, as it affects the detection of
 786  * the dish tone command at the satellite subsystem. The precision is improved
 787  * by using a scheduled msleep followed by udelay for the remainder.
 788  */
 789 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
 790 {
 791         s32 delta;
 792
 793         *waketime = ktime_add_us(*waketime, add_usec);
 794         delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 795         if (delta > 2500) {
 796                 msleep((delta - 1500) / 1000);
 797                 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
 798         }
 799         if (delta > 0)
 800                 udelay(delta);
 801 }
 802 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 803
 804 static int dvb_frontend_start(struct dvb_frontend *fe)
 805 {
 806         int ret;
 807         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 808         struct task_struct *fe_thread;
 809
 810         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 811
 812         if (fepriv->thread) {
 813                 if (fe->exit == DVB_FE_NO_EXIT)
 814                         return 0;
 815                 else
 816                         dvb_frontend_stop (fe);
 817         }
 818
 819         if (signal_pending(current))
 820                 return -EINTR;
 821         if (down_interruptible (&fepriv->sem))
 822                 return -EINTR;
 823
 824         fepriv->state = FESTATE_IDLE;
 825         fe->exit = DVB_FE_NO_EXIT;
 826         fepriv->thread = NULL;
 827         mb();
 828
 829         fe_thread = kthread_run(dvb_frontend_thread, fe,
 830                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
 831         if (IS_ERR(fe_thread)) {
 832                 ret = PTR_ERR(fe_thread);
 833                 dev_warn(fe->dvb->device,
 834                                 "dvb_frontend_start: failed to start kthread (%d)\n",
 835                                 ret);
 836                 up(&fepriv->sem);
 837                 return ret;
 838         }
 839         fepriv->thread = fe_thread;
 840         return 0;
 841 }
 842
 843 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 844                                         u32 *freq_min, u32 *freq_max)
 845 {
 846         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 847
 848         if (fe->ops.info.frequency_max == 0)
 849                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 850         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 851                 *freq_max = fe->ops.info.frequency_max;
 852         else
 853                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 854
 855         if (*freq_min == 0 || *freq_max == 0)
 856                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 857                                 fe->dvb->num, fe->id);
 858 }
 859
 860 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 861 {
 862         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 863         u32 freq_min;
 864         u32 freq_max;
 865
 866         /* range check: frequency */
 867         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max);
 868         if ((freq_min && c->frequency < freq_min) ||
 869             (freq_max && c->frequency > freq_max)) {
 870                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 871                                 fe->dvb->num, fe->id, c->frequency,
 872                                 freq_min, freq_max);
 873                 return -EINVAL;
 874         }
 875
 876         /* range check: symbol rate */
 877         switch (c->delivery_system) {
 878         case SYS_DVBS:
 879         case SYS_DVBS2:
 880         case SYS_TURBO:
 881         case SYS_DVBC_ANNEX_A:
 882         case SYS_DVBC_ANNEX_C:
 883                 if ((fe->ops.info.symbol_rate_min &&
 884                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 885                     (fe->ops.info.symbol_rate_max &&
 886                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 887                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 888                                         fe->dvb->num, fe->id, c->symbol_rate,
 889                                         fe->ops.info.symbol_rate_min,
 890                                         fe->ops.info.symbol_rate_max);
 891                         return -EINVAL;
 892                 }
 893         default:
 894                 break;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 901 {
 902         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 903         int i;
 904         u32 delsys;
 905
 906         delsys = c->delivery_system;
 907         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
 908         c->delivery_system = delsys;
 909
 910         c->state = DTV_CLEAR;
 911
 912         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
 913                         __func__, c->delivery_system);
 914
 915         c->transmission_mode = TRANSMISSION_MODE_AUTO;
 916         c->bandwidth_hz = 0;    /* AUTO */
 917         c->guard_interval = GUARD_INTERVAL_AUTO;
 918         c->hierarchy = HIERARCHY_AUTO;
 919         c->symbol_rate = 0;
 920         c->code_rate_HP = FEC_AUTO;
 921         c->code_rate_LP = FEC_AUTO;
 922         c->fec_inner = FEC_AUTO;
 923         c->rolloff = ROLLOFF_AUTO;
 924         c->voltage = SEC_VOLTAGE_OFF;
 925         c->sectone = SEC_TONE_OFF;
 926         c->pilot = PILOT_AUTO;
 927
 928         c->isdbt_partial_reception = 0;
 929         c->isdbt_sb_mode = 0;
 930         c->isdbt_sb_subchannel = 0;
 931         c->isdbt_sb_segment_idx = 0;
 932         c->isdbt_sb_segment_count = 0;
 933         c->isdbt_layer_enabled = 0;
 934         for (i = 0; i < 3; i++) {
 935                 c->layer[i].fec = FEC_AUTO;
 936                 c->layer[i].modulation = QAM_AUTO;
 937                 c->layer[i].interleaving = 0;
 938                 c->layer[i].segment_count = 0;
 939         }
 940
 941         c->stream_id = NO_STREAM_ID_FILTER;
 942
 943         switch (c->delivery_system) {
 944         case SYS_DVBS:
 945         case SYS_DVBS2:
 946         case SYS_TURBO:
 947                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
 948                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
 949                 break;
 950         case SYS_ATSC:
 951                 c->modulation = VSB_8;
 952                 break;
 953         case SYS_ISDBS:
 954                 c->symbol_rate = 28860000;
 955                 c->rolloff = ROLLOFF_35;
 956                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
 957                 break;
 958         default:
 959                 c->modulation = QAM_AUTO;
 960                 break;
 961         }
 962
 963         c->lna = LNA_AUTO;
 964
 965         return 0;
 966 }
 967
 968 #define _DTV_CMD(n, s, b) \
 969 [n] = { \
 970         .name = #n, \
 971         .cmd  = n, \
 972         .set  = s,\
 973         .buffer = b \
 974 }
 975
 976 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
 977         _DTV_CMD(DTV_TUNE, 1, 0),
 978         _DTV_CMD(DTV_CLEAR, 1, 0),
 979
 980         /* Set */
 981         _DTV_CMD(DTV_FREQUENCY, 1, 0),
 982         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
 983         _DTV_CMD(DTV_MODULATION, 1, 0),
 984         _DTV_CMD(DTV_INVERSION, 1, 0),
 985         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
 986         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
 987         _DTV_CMD(DTV_INNER_FEC, 1, 0),
 988         _DTV_CMD(DTV_VOLTAGE, 1, 0),
 989         _DTV_CMD(DTV_TONE, 1, 0),
 990         _DTV_CMD(DTV_PILOT, 1, 0),
 991         _DTV_CMD(DTV_ROLLOFF, 1, 0),
 992         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
 993         _DTV_CMD(DTV_HIERARCHY, 1, 0),
 994         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
 995         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
 996         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
 997         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
 998         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
 999
1000         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1001         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1002         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1003         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1004         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1005         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1006         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1007         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1008         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1009         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1010         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1011         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1012         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1013         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1014         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1015         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1016         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1017         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1018
1019         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1020         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1021         _DTV_CMD(DTV_LNA, 1, 0),
1022
1023         /* Get */
1024         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1025         _DTV_CMD(DTV_API_VERSION, 0, 0),
1026
1027         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1028
1029         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1030         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1031
1032         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1033         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1034         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1035         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1036         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1037         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1038         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1039         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1040         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1041         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1042         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1043         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1044         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1045
1046         /* Statistics API */
1047         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1048         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1049         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1050         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1051         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1052         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1053         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1054         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1055 };
1056
1057 static void dtv_property_dump(struct dvb_frontend *fe,
1058                               bool is_set,
1059                               struct dtv_property *tvp)
1060 {
1061         int i;
1062
1063         if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) {
1064                 dev_warn(fe->dvb->device, "%s: %s tvp.cmd = 0x%08x undefined\n",
1065                                 __func__,
1066                                 is_set ? "SET" : "GET",
1067                                 tvp->cmd);
1068                 return;
1069         }
1070
1071         dev_dbg(fe->dvb->device, "%s: %s tvp.cmd    = 0x%08x (%s)\n", __func__,
1072                 is_set ? "SET" : "GET",
1073                 tvp->cmd,
1074                 dtv_cmds[tvp->cmd].name);
1075
1076         if (dtv_cmds[tvp->cmd].buffer) {
1077                 dev_dbg(fe->dvb->device, "%s: tvp.u.buffer.len = 0x%02x\n",
1078                         __func__, tvp->u.buffer.len);
1079
1080                 for(i = 0; i < tvp->u.buffer.len; i++)
1081                         dev_dbg(fe->dvb->device,
1082                                         "%s: tvp.u.buffer.data[0x%02x] = 0x%02x\n",
1083                                         __func__, i, tvp->u.buffer.data[i]);
1084         } else {
1085                 dev_dbg(fe->dvb->device, "%s: tvp.u.data = 0x%08x\n", __func__,
1086                                 tvp->u.data);
1087         }
1088 }
1089
1090 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1091  * drivers can use a single set_frontend tuning function, regardless of whether
1092  * it's being used for the legacy or new API, reducing code and complexity.
1093  */
1094 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1095                                    struct dtv_frontend_properties *c,
1096                                    const struct dvb_frontend_parameters *p)
1097 {
1098         c->frequency = p->frequency;
1099         c->inversion = p->inversion;
1100
1101         switch (dvbv3_type(c->delivery_system)) {
1102         case DVBV3_QPSK:
1103                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1104                 c->symbol_rate = p->u.qpsk.symbol_rate;
1105                 c->fec_inner = p->u.qpsk.fec_inner;
1106                 break;
1107         case DVBV3_QAM:
1108                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1109                 c->symbol_rate = p->u.qam.symbol_rate;
1110                 c->fec_inner = p->u.qam.fec_inner;
1111                 c->modulation = p->u.qam.modulation;
1112                 break;
1113         case DVBV3_OFDM:
1114                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1115
1116                 switch (p->u.ofdm.bandwidth) {
1117                 case BANDWIDTH_10_MHZ:
1118                         c->bandwidth_hz = 10000000;
1119                         break;
1120                 case BANDWIDTH_8_MHZ:
1121                         c->bandwidth_hz = 8000000;
1122                         break;
1123                 case BANDWIDTH_7_MHZ:
1124                         c->bandwidth_hz = 7000000;
1125                         break;
1126                 case BANDWIDTH_6_MHZ:
1127                         c->bandwidth_hz = 6000000;
1128                         break;
1129                 case BANDWIDTH_5_MHZ:
1130                         c->bandwidth_hz = 5000000;
1131                         break;
1132                 case BANDWIDTH_1_712_MHZ:
1133                         c->bandwidth_hz = 1712000;
1134                         break;
1135                 case BANDWIDTH_AUTO:
1136                         c->bandwidth_hz = 0;
1137                 }
1138
1139                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1140                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1141                 c->modulation = p->u.ofdm.constellation;
1142                 c->transmission_mode = p->u.ofdm.transmission_mode;
1143                 c->guard_interval = p->u.ofdm.guard_interval;
1144                 c->hierarchy = p->u.ofdm.hierarchy_information;
1145                 break;
1146         case DVBV3_ATSC:
1147                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1148                 c->modulation = p->u.vsb.modulation;
1149                 if (c->delivery_system == SYS_ATSCMH)
1150                         break;
1151                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1152                         c->delivery_system = SYS_ATSC;
1153                 else
1154                         c->delivery_system = SYS_DVBC_ANNEX_B;
1155                 break;
1156         case DVBV3_UNKNOWN:
1157                 dev_err(fe->dvb->device,
1158                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1159                                 __func__, c->delivery_system);
1160                 return -EINVAL;
1161         }
1162
1163         return 0;
1164 }
1165
1166 /* Ensure the cached values are set correctly in the frontend
1167  * legacy tuning structures, for the advanced tuning API.
1168  */
1169 static int
1170 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1171                                 const struct dtv_frontend_properties *c,
1172                                 struct dvb_frontend_parameters *p)
1173 {
1174         p->frequency = c->frequency;
1175         p->inversion = c->inversion;
1176
1177         switch (dvbv3_type(c->delivery_system)) {
1178         case DVBV3_UNKNOWN:
1179                 dev_err(fe->dvb->device,
1180                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1181                                 __func__, c->delivery_system);
1182                 return -EINVAL;
1183         case DVBV3_QPSK:
1184                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1185                 p->u.qpsk.symbol_rate = c->symbol_rate;
1186                 p->u.qpsk.fec_inner = c->fec_inner;
1187                 break;
1188         case DVBV3_QAM:
1189                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1190                 p->u.qam.symbol_rate = c->symbol_rate;
1191                 p->u.qam.fec_inner = c->fec_inner;
1192                 p->u.qam.modulation = c->modulation;
1193                 break;
1194         case DVBV3_OFDM:
1195                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1196                 switch (c->bandwidth_hz) {
1197                 case 10000000:
1198                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1199                         break;
1200                 case 8000000:
1201                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1202                         break;
1203                 case 7000000:
1204                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1205                         break;
1206                 case 6000000:
1207                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1208                         break;
1209                 case 5000000:
1210                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1211                         break;
1212                 case 1712000:
1213                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1214                         break;
1215                 case 0:
1216                 default:
1217                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1218                 }
1219                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1220                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1221                 p->u.ofdm.constellation = c->modulation;
1222                 p->u.ofdm.transmission_mode = c->transmission_mode;
1223                 p->u.ofdm.guard_interval = c->guard_interval;
1224                 p->u.ofdm.hierarchy_information = c->hierarchy;
1225                 break;
1226         case DVBV3_ATSC:
1227                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1228                 p->u.vsb.modulation = c->modulation;
1229                 break;
1230         }
1231         return 0;
1232 }
1233
1234 /**
1235  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1236  * @fe:         struct dvb_frontend pointer
1237  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1238  * @p_out       struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1239  *
1240  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1241  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1242  * If p_out is not null, it will update the DVBv3 params pointed by it.
1243  */
1244 static int dtv_get_frontend(struct dvb_frontend *fe,
1245                             struct dtv_frontend_properties *c,
1246                             struct dvb_frontend_parameters *p_out)
1247 {
1248         int r;
1249
1250         if (fe->ops.get_frontend) {
1251                 r = fe->ops.get_frontend(fe, c);
1252                 if (unlikely(r < 0))
1253                         return r;
1254                 if (p_out)
1255                         dtv_property_legacy_params_sync(fe, c, p_out);
1256                 return 0;
1257         }
1258
1259         /* As everything is in cache, get_frontend fops are always supported */
1260         return 0;
1261 }
1262
1263 static int dvb_frontend_ioctl_legacy(struct file *file,
1264                         unsigned int cmd, void *parg);
1265 static int dvb_frontend_ioctl_properties(struct file *file,
1266                         unsigned int cmd, void *parg);
1267
1268 static int dtv_property_process_get(struct dvb_frontend *fe,
1269                                     const struct dtv_frontend_properties *c,
1270                                     struct dtv_property *tvp,
1271                                     struct file *file)
1272 {
1273         int r, ncaps;
1274
1275         switch(tvp->cmd) {
1276         case DTV_ENUM_DELSYS:
1277                 ncaps = 0;
1278                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1279                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1280                         ncaps++;
1281                 }
1282                 tvp->u.buffer.len = ncaps;
1283                 break;
1284         case DTV_FREQUENCY:
1285                 tvp->u.data = c->frequency;
1286                 break;
1287         case DTV_MODULATION:
1288                 tvp->u.data = c->modulation;
1289                 break;
1290         case DTV_BANDWIDTH_HZ:
1291                 tvp->u.data = c->bandwidth_hz;
1292                 break;
1293         case DTV_INVERSION:
1294                 tvp->u.data = c->inversion;
1295                 break;
1296         case DTV_SYMBOL_RATE:
1297                 tvp->u.data = c->symbol_rate;
1298                 break;
1299         case DTV_INNER_FEC:
1300                 tvp->u.data = c->fec_inner;
1301                 break;
1302         case DTV_PILOT:
1303                 tvp->u.data = c->pilot;
1304                 break;
1305         case DTV_ROLLOFF:
1306                 tvp->u.data = c->rolloff;
1307                 break;
1308         case DTV_DELIVERY_SYSTEM:
1309                 tvp->u.data = c->delivery_system;
1310                 break;
1311         case DTV_VOLTAGE:
1312                 tvp->u.data = c->voltage;
1313                 break;
1314         case DTV_TONE:
1315                 tvp->u.data = c->sectone;
1316                 break;
1317         case DTV_API_VERSION:
1318                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1319                 break;
1320         case DTV_CODE_RATE_HP:
1321                 tvp->u.data = c->code_rate_HP;
1322                 break;
1323         case DTV_CODE_RATE_LP:
1324                 tvp->u.data = c->code_rate_LP;
1325                 break;
1326         case DTV_GUARD_INTERVAL:
1327                 tvp->u.data = c->guard_interval;
1328                 break;
1329         case DTV_TRANSMISSION_MODE:
1330                 tvp->u.data = c->transmission_mode;
1331                 break;
1332         case DTV_HIERARCHY:
1333                 tvp->u.data = c->hierarchy;
1334                 break;
1335         case DTV_INTERLEAVING:
1336                 tvp->u.data = c->interleaving;
1337                 break;
1338
1339         /* ISDB-T Support here */
1340         case DTV_ISDBT_PARTIAL_RECEPTION:
1341                 tvp->u.data = c->isdbt_partial_reception;
1342                 break;
1343         case DTV_ISDBT_SOUND_BROADCASTING:
1344                 tvp->u.data = c->isdbt_sb_mode;
1345                 break;
1346         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1347                 tvp->u.data = c->isdbt_sb_subchannel;
1348                 break;
1349         case DTV_ISDBT_SB_SEGMENT_IDX:
1350                 tvp->u.data = c->isdbt_sb_segment_idx;
1351                 break;
1352         case DTV_ISDBT_SB_SEGMENT_COUNT:
1353                 tvp->u.data = c->isdbt_sb_segment_count;
1354                 break;
1355         case DTV_ISDBT_LAYER_ENABLED:
1356                 tvp->u.data = c->isdbt_layer_enabled;
1357                 break;
1358         case DTV_ISDBT_LAYERA_FEC:
1359                 tvp->u.data = c->layer[0].fec;
1360                 break;
1361         case DTV_ISDBT_LAYERA_MODULATION:
1362                 tvp->u.data = c->layer[0].modulation;
1363                 break;
1364         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1365                 tvp->u.data = c->layer[0].segment_count;
1366                 break;
1367         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1368                 tvp->u.data = c->layer[0].interleaving;
1369                 break;
1370         case DTV_ISDBT_LAYERB_FEC:
1371                 tvp->u.data = c->layer[1].fec;
1372                 break;
1373         case DTV_ISDBT_LAYERB_MODULATION:
1374                 tvp->u.data = c->layer[1].modulation;
1375                 break;
1376         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1377                 tvp->u.data = c->layer[1].segment_count;
1378                 break;
1379         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1380                 tvp->u.data = c->layer[1].interleaving;
1381                 break;
1382         case DTV_ISDBT_LAYERC_FEC:
1383                 tvp->u.data = c->layer[2].fec;
1384                 break;
1385         case DTV_ISDBT_LAYERC_MODULATION:
1386                 tvp->u.data = c->layer[2].modulation;
1387                 break;
1388         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1389                 tvp->u.data = c->layer[2].segment_count;
1390                 break;
1391         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1392                 tvp->u.data = c->layer[2].interleaving;
1393                 break;
1394
1395         /* Multistream support */
1396         case DTV_STREAM_ID:
1397         case DTV_DVBT2_PLP_ID_LEGACY:
1398                 tvp->u.data = c->stream_id;
1399                 break;
1400
1401         /* ATSC-MH */
1402         case DTV_ATSCMH_FIC_VER:
1403                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1404                 break;
1405         case DTV_ATSCMH_PARADE_ID:
1406                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1407                 break;
1408         case DTV_ATSCMH_NOG:
1409                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1410                 break;
1411         case DTV_ATSCMH_TNOG:
1412                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1413                 break;
1414         case DTV_ATSCMH_SGN:
1415                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1416                 break;
1417         case DTV_ATSCMH_PRC:
1418                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1419                 break;
1420         case DTV_ATSCMH_RS_FRAME_MODE:
1421                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1422                 break;
1423         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1424                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1425                 break;
1426         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1427                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1428                 break;
1429         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1430                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1431                 break;
1432         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1433                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1434                 break;
1435         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1436                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1437                 break;
1438         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1439                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1440                 break;
1441         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1442                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1443                 break;
1444         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1445                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1446                 break;
1447
1448         case DTV_LNA:
1449                 tvp->u.data = c->lna;
1450                 break;
1451
1452         /* Fill quality measures */
1453         case DTV_STAT_SIGNAL_STRENGTH:
1454                 tvp->u.st = c->strength;
1455                 break;
1456         case DTV_STAT_CNR:
1457                 tvp->u.st = c->cnr;
1458                 break;
1459         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1460                 tvp->u.st = c->pre_bit_error;
1461                 break;
1462         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1463                 tvp->u.st = c->pre_bit_count;
1464                 break;
1465         case DTV_STAT_POST_ERROR_BIT_COUNT:
1466                 tvp->u.st = c->post_bit_error;
1467                 break;
1468         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1469                 tvp->u.st = c->post_bit_count;
1470                 break;
1471         case DTV_STAT_ERROR_BLOCK_COUNT:
1472                 tvp->u.st = c->block_error;
1473                 break;
1474         case DTV_STAT_TOTAL_BLOCK_COUNT:
1475                 tvp->u.st = c->block_count;
1476                 break;
1477         default:
1478                 dev_dbg(fe->dvb->device,
1479                         "%s: FE property %d doesn't exist\n",
1480                         __func__, tvp->cmd);
1481                 return -EINVAL;
1482         }
1483
1484         /* Allow the frontend to override outgoing properties */
1485         if (fe->ops.get_property) {
1486                 r = fe->ops.get_property(fe, tvp);
1487                 if (r < 0)
1488                         return r;
1489         }
1490
1491         dtv_property_dump(fe, false, tvp);
1492
1493         return 0;
1494 }
1495
1496 static int dtv_set_frontend(struct dvb_frontend *fe);
1497
1498 static bool is_dvbv3_delsys(u32 delsys)
1499 {
1500         bool status;
1501
1502         status = (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1503                  (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1504
1505         return status;
1506 }
1507
1508 /**
1509  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1510  * @fe:                 struct frontend;
1511  * @delsys:                     DVBv5 type that will be used for emulation
1512  *
1513  * Provides emulation for delivery systems that are compatible with the old
1514  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1515  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1516  * parameters are compatible with DVB-S spec.
1517  */
1518 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1519 {
1520         int i;
1521         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1522
1523         c->delivery_system = delsys;
1524
1525         /*
1526          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1527          */
1528         if (c->delivery_system == SYS_ISDBT) {
1529                 dev_dbg(fe->dvb->device,
1530                         "%s: Using defaults for SYS_ISDBT\n",
1531                         __func__);
1532
1533                 if (!c->bandwidth_hz)
1534                         c->bandwidth_hz = 6000000;
1535
1536                 c->isdbt_partial_reception = 0;
1537                 c->isdbt_sb_mode = 0;
1538                 c->isdbt_sb_subchannel = 0;
1539                 c->isdbt_sb_segment_idx = 0;
1540                 c->isdbt_sb_segment_count = 0;
1541                 c->isdbt_layer_enabled = 7;
1542                 for (i = 0; i < 3; i++) {
1543                         c->layer[i].fec = FEC_AUTO;
1544                         c->layer[i].modulation = QAM_AUTO;
1545                         c->layer[i].interleaving = 0;
1546                         c->layer[i].segment_count = 0;
1547                 }
1548         }
1549         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1550                 __func__, c->delivery_system);
1551
1552         return 0;
1553 }
1554
1555 /**
1556  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1557  * @fe:                 frontend struct
1558  * @desired_system:     delivery system requested by the user
1559  *
1560  * A DVBv5 call know what's the desired system it wants. So, set it.
1561  *
1562  * There are, however, a few known issues with early DVBv5 applications that
1563  * are also handled by this logic:
1564  *
1565  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1566  *    This is an API violation, but, as we don't want to break userspace,
1567  *    convert it to the first supported delivery system.
1568  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1569  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1570  *    ISDB-T provided backward compat with DVB-T.
1571  */
1572 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1573                                      u32 desired_system)
1574 {
1575         int ncaps;
1576         u32 delsys = SYS_UNDEFINED;
1577         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1578         enum dvbv3_emulation_type type;
1579
1580         /*
1581          * It was reported that some old DVBv5 applications were
1582          * filling delivery_system with SYS_UNDEFINED. If this happens,
1583          * assume that the application wants to use the first supported
1584          * delivery system.
1585          */
1586         if (desired_system == SYS_UNDEFINED)
1587                 desired_system = fe->ops.delsys[0];
1588
1589         /*
1590          * This is a DVBv5 call. So, it likely knows the supported
1591          * delivery systems. So, check if the desired delivery system is
1592          * supported
1593          */
1594         ncaps = 0;
1595         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1596                 if (fe->ops.delsys[ncaps] == desired_system) {
1597                         c->delivery_system = desired_system;
1598                         dev_dbg(fe->dvb->device,
1599                                         "%s: Changing delivery system to %d\n",
1600                                         __func__, desired_system);
1601                         return 0;
1602                 }
1603                 ncaps++;
1604         }
1605
1606         /*
1607          * The requested delivery system isn't supported. Maybe userspace
1608          * is requesting a DVBv3 compatible delivery system.
1609          *
1610          * The emulation only works if the desired system is one of the
1611          * delivery systems supported by DVBv3 API
1612          */
1613         if (!is_dvbv3_delsys(desired_system)) {
1614                 dev_dbg(fe->dvb->device,
1615                         "%s: Delivery system %d not supported.\n",
1616                         __func__, desired_system);
1617                 return -EINVAL;
1618         }
1619
1620         type = dvbv3_type(desired_system);
1621
1622         /*
1623         * Get the last non-DVBv3 delivery system that has the same type
1624         * of the desired system
1625         */
1626         ncaps = 0;
1627         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1628                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1629                         delsys = fe->ops.delsys[ncaps];
1630                 ncaps++;
1631         }
1632
1633         /* There's nothing compatible with the desired delivery system */
1634         if (delsys == SYS_UNDEFINED) {
1635                 dev_dbg(fe->dvb->device,
1636                         "%s: Delivery system %d not supported on emulation mode.\n",
1637                         __func__, desired_system);
1638                 return -EINVAL;
1639         }
1640
1641         dev_dbg(fe->dvb->device,
1642                 "%s: Using delivery system %d emulated as if it were %d\n",
1643                 __func__, delsys, desired_system);
1644
1645         return emulate_delivery_system(fe, desired_system);
1646 }
1647
1648 /**
1649  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1650  * @fe: frontend struct
1651  *
1652  * A DVBv3 call doesn't know what's the desired system it wants. It also
1653  * doesn't allow to switch between different types. Due to that, userspace
1654  * should use DVBv5 instead.
1655  * However, in order to avoid breaking userspace API, limited backward
1656  * compatibility support is provided.
1657  *
1658  * There are some delivery systems that are incompatible with DVBv3 calls.
1659  *
1660  * This routine should work fine for frontends that support just one delivery
1661  * system.
1662  *
1663  * For frontends that support multiple frontends:
1664  * 1) It defaults to use the first supported delivery system. There's an
1665  *    userspace application that allows changing it at runtime;
1666  *
1667  * 2) If the current delivery system is not compatible with DVBv3, it gets
1668  *    the first one that it is compatible.
1669  *
1670  * NOTE: in order for this to work with applications like Kaffeine that
1671  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1672  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1673  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1674  *      to DVB-S.
1675  */
1676 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1677 {
1678         int ncaps;
1679         u32 delsys = SYS_UNDEFINED;
1680         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1681
1682         /* If not set yet, defaults to the first supported delivery system */
1683         if (c->delivery_system == SYS_UNDEFINED)
1684                 c->delivery_system = fe->ops.delsys[0];
1685
1686         /*
1687          * Trivial case: just use the current one, if it already a DVBv3
1688          * delivery system
1689          */
1690         if (is_dvbv3_delsys(c->delivery_system)) {
1691                 dev_dbg(fe->dvb->device,
1692                                 "%s: Using delivery system to %d\n",
1693                                 __func__, c->delivery_system);
1694                 return 0;
1695         }
1696
1697         /*
1698          * Seek for the first delivery system that it is compatible with a
1699          * DVBv3 standard
1700          */
1701         ncaps = 0;
1702         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1704                         delsys = fe->ops.delsys[ncaps];
1705                         break;
1706                 }
1707                 ncaps++;
1708         }
1709         if (delsys == SYS_UNDEFINED) {
1710                 dev_dbg(fe->dvb->device,
1711                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1712                         __func__);
1713                 return -EINVAL;
1714         }
1715         return emulate_delivery_system(fe, delsys);
1716 }
1717
1718 static int dtv_property_process_set(struct dvb_frontend *fe,
1719                                     struct dtv_property *tvp,
1720                                     struct file *file)
1721 {
1722         int r = 0;
1723         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1724
1725         /* Allow the frontend to validate incoming properties */
1726         if (fe->ops.set_property) {
1727                 r = fe->ops.set_property(fe, tvp);
1728                 if (r < 0)
1729                         return r;
1730         }
1731
1732         dtv_property_dump(fe, true, tvp);
1733
1734         switch(tvp->cmd) {
1735         case DTV_CLEAR:
1736                 /*
1737                  * Reset a cache of data specific to the frontend here. This does
1738                  * not effect hardware.
1739                  */
1740                 dvb_frontend_clear_cache(fe);
1741                 break;
1742         case DTV_TUNE:
1743                 /* interpret the cache of data, build either a traditional frontend
1744                  * tunerequest so we can pass validation in the FE_SET_FRONTEND
1745                  * ioctl.
1746                  */
1747                 c->state = tvp->cmd;
1748                 dev_dbg(fe->dvb->device, "%s: Finalised property cache\n",
1749                                 __func__);
1750
1751                 r = dtv_set_frontend(fe);
1752                 break;
1753         case DTV_FREQUENCY:
1754                 c->frequency = tvp->u.data;
1755                 break;
1756         case DTV_MODULATION:
1757                 c->modulation = tvp->u.data;
1758                 break;
1759         case DTV_BANDWIDTH_HZ:
1760                 c->bandwidth_hz = tvp->u.data;
1761                 break;
1762         case DTV_INVERSION:
1763                 c->inversion = tvp->u.data;
1764                 break;
1765         case DTV_SYMBOL_RATE:
1766                 c->symbol_rate = tvp->u.data;
1767                 break;
1768         case DTV_INNER_FEC:
1769                 c->fec_inner = tvp->u.data;
1770                 break;
1771         case DTV_PILOT:
1772                 c->pilot = tvp->u.data;
1773                 break;
1774         case DTV_ROLLOFF:
1775                 c->rolloff = tvp->u.data;
1776                 break;
1777         case DTV_DELIVERY_SYSTEM:
1778                 r = dvbv5_set_delivery_system(fe, tvp->u.data);
1779                 break;
1780         case DTV_VOLTAGE:
1781                 c->voltage = tvp->u.data;
1782                 r = dvb_frontend_ioctl_legacy(file, FE_SET_VOLTAGE,
1783                         (void *)c->voltage);
1784                 break;
1785         case DTV_TONE:
1786                 c->sectone = tvp->u.data;
1787                 r = dvb_frontend_ioctl_legacy(file, FE_SET_TONE,
1788                         (void *)c->sectone);
1789                 break;
1790         case DTV_CODE_RATE_HP:
1791                 c->code_rate_HP = tvp->u.data;
1792                 break;
1793         case DTV_CODE_RATE_LP:
1794                 c->code_rate_LP = tvp->u.data;
1795                 break;
1796         case DTV_GUARD_INTERVAL:
1797                 c->guard_interval = tvp->u.data;
1798                 break;
1799         case DTV_TRANSMISSION_MODE:
1800                 c->transmission_mode = tvp->u.data;
1801                 break;
1802         case DTV_HIERARCHY:
1803                 c->hierarchy = tvp->u.data;
1804                 break;
1805         case DTV_INTERLEAVING:
1806                 c->interleaving = tvp->u.data;
1807                 break;
1808
1809         /* ISDB-T Support here */
1810         case DTV_ISDBT_PARTIAL_RECEPTION:
1811                 c->isdbt_partial_reception = tvp->u.data;
1812                 break;
1813         case DTV_ISDBT_SOUND_BROADCASTING:
1814                 c->isdbt_sb_mode = tvp->u.data;
1815                 break;
1816         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1817                 c->isdbt_sb_subchannel = tvp->u.data;
1818                 break;
1819         case DTV_ISDBT_SB_SEGMENT_IDX:
1820                 c->isdbt_sb_segment_idx = tvp->u.data;
1821                 break;
1822         case DTV_ISDBT_SB_SEGMENT_COUNT:
1823                 c->isdbt_sb_segment_count = tvp->u.data;
1824                 break;
1825         case DTV_ISDBT_LAYER_ENABLED:
1826                 c->isdbt_layer_enabled = tvp->u.data;
1827                 break;
1828         case DTV_ISDBT_LAYERA_FEC:
1829                 c->layer[0].fec = tvp->u.data;
1830                 break;
1831         case DTV_ISDBT_LAYERA_MODULATION:
1832                 c->layer[0].modulation = tvp->u.data;
1833                 break;
1834         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1835                 c->layer[0].segment_count = tvp->u.data;
1836                 break;
1837         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1838                 c->layer[0].interleaving = tvp->u.data;
1839                 break;
1840         case DTV_ISDBT_LAYERB_FEC:
1841                 c->layer[1].fec = tvp->u.data;
1842                 break;
1843         case DTV_ISDBT_LAYERB_MODULATION:
1844                 c->layer[1].modulation = tvp->u.data;
1845                 break;
1846         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1847                 c->layer[1].segment_count = tvp->u.data;
1848                 break;
1849         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1850                 c->layer[1].interleaving = tvp->u.data;
1851                 break;
1852         case DTV_ISDBT_LAYERC_FEC:
1853                 c->layer[2].fec = tvp->u.data;
1854                 break;
1855         case DTV_ISDBT_LAYERC_MODULATION:
1856                 c->layer[2].modulation = tvp->u.data;
1857                 break;
1858         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1859                 c->layer[2].segment_count = tvp->u.data;
1860                 break;
1861         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1862                 c->layer[2].interleaving = tvp->u.data;
1863                 break;
1864
1865         /* Multistream support */
1866         case DTV_STREAM_ID:
1867         case DTV_DVBT2_PLP_ID_LEGACY:
1868                 c->stream_id = tvp->u.data;
1869                 break;
1870
1871         /* ATSC-MH */
1872         case DTV_ATSCMH_PARADE_ID:
1873                 fe->dtv_property_cache.atscmh_parade_id = tvp->u.data;
1874                 break;
1875         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1876                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = tvp->u.data;
1877                 break;
1878
1879         case DTV_LNA:
1880                 c->lna = tvp->u.data;
1881                 if (fe->ops.set_lna)
1882                         r = fe->ops.set_lna(fe);
1883                 if (r < 0)
1884                         c->lna = LNA_AUTO;
1885                 break;
1886
1887         default:
1888                 return -EINVAL;
1889         }
1890
1891         return r;
1892 }
1893
1894 static int dvb_frontend_ioctl(struct file *file,
1895                         unsigned int cmd, void *parg)
1896 {
1897         struct dvb_device *dvbdev = file->private_data;
1898         struct dvb_frontend *fe = dvbdev->priv;
1899         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1900         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1901         int err = -EOPNOTSUPP;
1902
1903         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1904         if (down_interruptible(&fepriv->sem))
1905                 return -ERESTARTSYS;
1906
1907         if (fe->exit != DVB_FE_NO_EXIT) {
1908                 up(&fepriv->sem);
1909                 return -ENODEV;
1910         }
1911
1912         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
1913             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
1914              cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
1915                 up(&fepriv->sem);
1916                 return -EPERM;
1917         }
1918
1919         if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
1920                 err = dvb_frontend_ioctl_properties(file, cmd, parg);
1921         else {
1922                 c->state = DTV_UNDEFINED;
1923                 err = dvb_frontend_ioctl_legacy(file, cmd, parg);
1924         }
1925
1926         up(&fepriv->sem);
1927         return err;
1928 }
1929
1930 static int dvb_frontend_ioctl_properties(struct file *file,
1931                         unsigned int cmd, void *parg)
1932 {
1933         struct dvb_device *dvbdev = file->private_data;
1934         struct dvb_frontend *fe = dvbdev->priv;
1935         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1936         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1937         int err = 0;
1938
1939         struct dtv_properties *tvps = parg;
1940         struct dtv_property *tvp = NULL;
1941         int i;
1942
1943         dev_dbg(fe->dvb->device, "%s:\n", __func__);
1944
1945         if (cmd == FE_SET_PROPERTY) {
1946                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
1947                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
1948
1949                 /* Put an arbitrary limit on the number of messages that can
1950                  * be sent at once */
1951                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
1952                         return -EINVAL;
1953
1954                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
1955                 if (!tvp) {
1956                         err = -ENOMEM;
1957                         goto out;
1958                 }
1959
1960                 if (copy_from_user(tvp, (void __user *)tvps->props,
1961                                    tvps->num * sizeof(struct dtv_property))) {
1962                         err = -EFAULT;
1963                         goto out;
1964                 }
1965
1966                 for (i = 0; i < tvps->num; i++) {
1967                         err = dtv_property_process_set(fe, tvp + i, file);
1968                         if (err < 0)
1969                                 goto out;
1970                         (tvp + i)->result = err;
1971                 }
1972
1973                 if (c->state == DTV_TUNE)
1974                         dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
1975
1976         } else if (cmd == FE_GET_PROPERTY) {
1977                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
1978
1979                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
1980                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
1981
1982                 /* Put an arbitrary limit on the number of messages that can
1983                  * be sent at once */
1984                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
1985                         return -EINVAL;
1986
1987                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
1988                 if (!tvp) {
1989                         err = -ENOMEM;
1990                         goto out;
1991                 }
1992
1993                 if (copy_from_user(tvp, (void __user *)tvps->props,
1994                                    tvps->num * sizeof(struct dtv_property))) {
1995                         err = -EFAULT;
1996                         goto out;
1997                 }
1998
1999                 /*
2000                  * Let's use our own copy of property cache, in order to
2001                  * avoid mangling with DTV zigzag logic, as drivers might
2002                  * return crap, if they don't check if the data is available
2003                  * before updating the properties cache.
2004                  */
2005                 if (fepriv->state != FESTATE_IDLE) {
2006                         err = dtv_get_frontend(fe, &getp, NULL);
2007                         if (err < 0)
2008                                 goto out;
2009                 }
2010                 for (i = 0; i < tvps->num; i++) {
2011                         err = dtv_property_process_get(fe, &getp, tvp + i, file);
2012                         if (err < 0)
2013                                 goto out;
2014                         (tvp + i)->result = err;
2015                 }
2016
2017                 if (copy_to_user((void __user *)tvps->props, tvp,
2018                                  tvps->num * sizeof(struct dtv_property))) {
2019                         err = -EFAULT;
2020                         goto out;
2021                 }
2022
2023         } else
2024                 err = -EOPNOTSUPP;
2025
2026 out:
2027         kfree(tvp);
2028         return err;
2029 }
2030
2031 static int dtv_set_frontend(struct dvb_frontend *fe)
2032 {
2033         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2034         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2035         struct dvb_frontend_tune_settings fetunesettings;
2036         u32 rolloff = 0;
2037
2038         if (dvb_frontend_check_parameters(fe) < 0)
2039                 return -EINVAL;
2040
2041         /*
2042          * Initialize output parameters to match the values given by
2043          * the user. FE_SET_FRONTEND triggers an initial frontend event
2044          * with status = 0, which copies output parameters to userspace.
2045          */
2046         dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2047
2048         /*
2049          * Be sure that the bandwidth will be filled for all
2050          * non-satellite systems, as tuners need to know what
2051          * low pass/Nyquist half filter should be applied, in
2052          * order to avoid inter-channel noise.
2053          *
2054          * ISDB-T and DVB-T/T2 already sets bandwidth.
2055          * ATSC and DVB-C don't set, so, the core should fill it.
2056          *
2057          * On DVB-C Annex A and C, the bandwidth is a function of
2058          * the roll-off and symbol rate. Annex B defines different
2059          * roll-off factors depending on the modulation. Fortunately,
2060          * Annex B is only used with 6MHz, so there's no need to
2061          * calculate it.
2062          *
2063          * While not officially supported, a side effect of handling it at
2064          * the cache level is that a program could retrieve the bandwidth
2065          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2066          */
2067         switch (c->delivery_system) {
2068         case SYS_ATSC:
2069         case SYS_DVBC_ANNEX_B:
2070                 c->bandwidth_hz = 6000000;
2071                 break;
2072         case SYS_DVBC_ANNEX_A:
2073                 rolloff = 115;
2074                 break;
2075         case SYS_DVBC_ANNEX_C:
2076                 rolloff = 113;
2077                 break;
2078         case SYS_DVBS:
2079         case SYS_TURBO:
2080         case SYS_ISDBS:
2081                 rolloff = 135;
2082                 break;
2083         case SYS_DVBS2:
2084                 switch (c->rolloff) {
2085                 case ROLLOFF_20:
2086                         rolloff = 120;
2087                         break;
2088                 case ROLLOFF_25:
2089                         rolloff = 125;
2090                         break;
2091                 default:
2092                 case ROLLOFF_35:
2093                         rolloff = 135;
2094                 }
2095                 break;
2096         default:
2097                 break;
2098         }
2099         if (rolloff)
2100                 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2101
2102         /* force auto frequency inversion if requested */
2103         if (dvb_force_auto_inversion)
2104                 c->inversion = INVERSION_AUTO;
2105
2106         /*
2107          * without hierarchical coding code_rate_LP is irrelevant,
2108          * so we tolerate the otherwise invalid FEC_NONE setting
2109          */
2110         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2111                 c->code_rate_LP = FEC_AUTO;
2112
2113         /* get frontend-specific tuning settings */
2114         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2115         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2116                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2117                 fepriv->max_drift = fetunesettings.max_drift;
2118                 fepriv->step_size = fetunesettings.step_size;
2119         } else {
2120                 /* default values */
2121                 switch (c->delivery_system) {
2122                 case SYS_DVBS:
2123                 case SYS_DVBS2:
2124                 case SYS_ISDBS:
2125                 case SYS_TURBO:
2126                 case SYS_DVBC_ANNEX_A:
2127                 case SYS_DVBC_ANNEX_C:
2128                         fepriv->min_delay = HZ / 20;
2129                         fepriv->step_size = c->symbol_rate / 16000;
2130                         fepriv->max_drift = c->symbol_rate / 2000;
2131                         break;
2132                 case SYS_DVBT:
2133                 case SYS_DVBT2:
2134                 case SYS_ISDBT:
2135                 case SYS_DTMB:
2136                         fepriv->min_delay = HZ / 20;
2137                         fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
2138                         fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
2139                         break;
2140                 default:
2141                         /*
2142                          * FIXME: This sounds wrong! if freqency_stepsize is
2143                          * defined by the frontend, why not use it???
2144                          */
2145                         fepriv->min_delay = HZ / 20;
2146                         fepriv->step_size = 0; /* no zigzag */
2147                         fepriv->max_drift = 0;
2148                         break;
2149                 }
2150         }
2151         if (dvb_override_tune_delay > 0)
2152                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2153
2154         fepriv->state = FESTATE_RETUNE;
2155
2156         /* Request the search algorithm to search */
2157         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2158
2159         dvb_frontend_clear_events(fe);
2160         dvb_frontend_add_event(fe, 0);
2161         dvb_frontend_wakeup(fe);
2162         fepriv->status = 0;
2163
2164         return 0;
2165 }
2166
2167
2168 static int dvb_frontend_ioctl_legacy(struct file *file,
2169                         unsigned int cmd, void *parg)
2170 {
2171         struct dvb_device *dvbdev = file->private_data;
2172         struct dvb_frontend *fe = dvbdev->priv;
2173         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2174         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2175         int err = -EOPNOTSUPP;
2176
2177         switch (cmd) {
2178         case FE_GET_INFO: {
2179                 struct dvb_frontend_info* info = parg;
2180
2181                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
2182                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);
2183
2184                 /*
2185                  * Associate the 4 delivery systems supported by DVBv3
2186                  * API with their DVBv5 counterpart. For the other standards,
2187                  * use the closest type, assuming that it would hopefully
2188                  * work with a DVBv3 application.
2189                  * It should be noticed that, on multi-frontend devices with
2190                  * different types (terrestrial and cable, for example),
2191                  * a pure DVBv3 application won't be able to use all delivery
2192                  * systems. Yet, changing the DVBv5 cache to the other delivery
2193                  * system should be enough for making it work.
2194                  */
2195                 switch (dvbv3_type(c->delivery_system)) {
2196                 case DVBV3_QPSK:
2197                         info->type = FE_QPSK;
2198                         break;
2199                 case DVBV3_ATSC:
2200                         info->type = FE_ATSC;
2201                         break;
2202                 case DVBV3_QAM:
2203                         info->type = FE_QAM;
2204                         break;
2205                 case DVBV3_OFDM:
2206                         info->type = FE_OFDM;
2207                         break;
2208                 default:
2209                         dev_err(fe->dvb->device,
2210                                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2211                                         __func__, c->delivery_system);
2212                         fe->ops.info.type = FE_OFDM;
2213                 }
2214                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2215                                  __func__, c->delivery_system, fe->ops.info.type);
2216
2217                 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2218                 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2219                         info->caps |= FE_CAN_INVERSION_AUTO;
2220                 err = 0;
2221                 break;
2222         }
2223
2224         case FE_READ_STATUS: {
2225                 enum fe_status *status = parg;
2226
2227                 /* if retune was requested but hasn't occurred yet, prevent
2228                  * that user get signal state from previous tuning */
2229                 if (fepriv->state == FESTATE_RETUNE ||
2230                     fepriv->state == FESTATE_ERROR) {
2231                         err=0;
2232                         *status = 0;
2233                         break;
2234                 }
2235
2236                 if (fe->ops.read_status)
2237                         err = fe->ops.read_status(fe, status);
2238                 break;
2239         }
2240
2241         case FE_READ_BER:
2242                 if (fe->ops.read_ber) {
2243                         if (fepriv->thread)
2244                                 err = fe->ops.read_ber(fe, (__u32 *) parg);
2245                         else
2246                                 err = -EAGAIN;
2247                 }
2248                 break;
2249
2250         case FE_READ_SIGNAL_STRENGTH:
2251                 if (fe->ops.read_signal_strength) {
2252                         if (fepriv->thread)
2253                                 err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
2254                         else
2255                                 err = -EAGAIN;
2256                 }
2257                 break;
2258
2259         case FE_READ_SNR:
2260                 if (fe->ops.read_snr) {
2261                         if (fepriv->thread)
2262                                 err = fe->ops.read_snr(fe, (__u16 *) parg);
2263                         else
2264                                 err = -EAGAIN;
2265                 }
2266                 break;
2267
2268         case FE_READ_UNCORRECTED_BLOCKS:
2269                 if (fe->ops.read_ucblocks) {
2270                         if (fepriv->thread)
2271                                 err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
2272                         else
2273                                 err = -EAGAIN;
2274                 }
2275                 break;
2276
2277         case FE_DISEQC_RESET_OVERLOAD:
2278                 if (fe->ops.diseqc_reset_overload) {
2279                         err = fe->ops.diseqc_reset_overload(fe);
2280                         fepriv->state = FESTATE_DISEQC;
2281                         fepriv->status = 0;
2282                 }
2283                 break;
2284
2285         case FE_DISEQC_SEND_MASTER_CMD:
2286                 if (fe->ops.diseqc_send_master_cmd) {
2287                         struct dvb_diseqc_master_cmd *cmd = parg;
2288
2289                         if (cmd->msg_len > sizeof(cmd->msg)) {
2290                                 err = -EINVAL;
2291                                 break;
2292                         }
2293                         err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2294                         fepriv->state = FESTATE_DISEQC;
2295                         fepriv->status = 0;
2296                 }
2297                 break;
2298
2299         case FE_DISEQC_SEND_BURST:
2300                 if (fe->ops.diseqc_send_burst) {
2301                         err = fe->ops.diseqc_send_burst(fe,
2302                                                 (enum fe_sec_mini_cmd)parg);
2303                         fepriv->state = FESTATE_DISEQC;
2304                         fepriv->status = 0;
2305                 }
2306                 break;
2307
2308         case FE_SET_TONE:
2309                 if (fe->ops.set_tone) {
2310                         err = fe->ops.set_tone(fe,
2311                                                (enum fe_sec_tone_mode)parg);
2312                         fepriv->tone = (enum fe_sec_tone_mode)parg;
2313                         fepriv->state = FESTATE_DISEQC;
2314                         fepriv->status = 0;
2315                 }
2316                 break;
2317
2318         case FE_SET_VOLTAGE:
2319                 if (fe->ops.set_voltage) {
2320                         err = fe->ops.set_voltage(fe,
2321                                                   (enum fe_sec_voltage)parg);
2322                         fepriv->voltage = (enum fe_sec_voltage)parg;
2323                         fepriv->state = FESTATE_DISEQC;
2324                         fepriv->status = 0;
2325                 }
2326                 break;
2327
2328         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2329                 if (fe->ops.dishnetwork_send_legacy_command) {
2330                         err = fe->ops.dishnetwork_send_legacy_command(fe,
2331                                                          (unsigned long)parg);
2332                         fepriv->state = FESTATE_DISEQC;
2333                         fepriv->status = 0;
2334                 } else if (fe->ops.set_voltage) {
2335                         /*
2336                          * NOTE: This is a fallback condition.  Some frontends
2337                          * (stv0299 for instance) take longer than 8msec to
2338                          * respond to a set_voltage command.  Those switches
2339                          * need custom routines to switch properly.  For all
2340                          * other frontends, the following should work ok.
2341                          * Dish network legacy switches (as used by Dish500)
2342                          * are controlled by sending 9-bit command words
2343                          * spaced 8msec apart.
2344                          * the actual command word is switch/port dependent
2345                          * so it is up to the userspace application to send
2346                          * the right command.
2347                          * The command must always start with a '0' after
2348                          * initialization, so parg is 8 bits and does not
2349                          * include the initialization or start bit
2350                          */
2351                         unsigned long swcmd = ((unsigned long) parg) << 1;
2352                         ktime_t nexttime;
2353                         ktime_t tv[10];
2354                         int i;
2355                         u8 last = 1;
2356                         if (dvb_frontend_debug)
2357                                 printk("%s switch command: 0x%04lx\n", __func__, swcmd);
2358                         nexttime = ktime_get_boottime();
2359                         if (dvb_frontend_debug)
2360                                 tv[0] = nexttime;
2361                         /* before sending a command, initialize by sending
2362                          * a 32ms 18V to the switch
2363                          */
2364                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2365                         dvb_frontend_sleep_until(&nexttime, 32000);
2366
2367                         for (i = 0; i < 9; i++) {
2368                                 if (dvb_frontend_debug)
2369                                         tv[i+1] = ktime_get_boottime();
2370                                 if ((swcmd & 0x01) != last) {
2371                                         /* set voltage to (last ? 13V : 18V) */
2372                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2373                                         last = (last) ? 0 : 1;
2374                                 }
2375                                 swcmd = swcmd >> 1;
2376                                 if (i != 8)
2377                                         dvb_frontend_sleep_until(&nexttime, 8000);
2378                         }
2379                         if (dvb_frontend_debug) {
2380                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
2381                                         __func__, fe->dvb->num);
2382                                 for (i = 1; i < 10; i++)
2383                                         printk("%d: %d\n", i,
2384                                         (int) ktime_us_delta(tv[i], tv[i-1]));
2385                         }
2386                         err = 0;
2387                         fepriv->state = FESTATE_DISEQC;
2388                         fepriv->status = 0;
2389                 }
2390                 break;
2391
2392         case FE_DISEQC_RECV_SLAVE_REPLY:
2393                 if (fe->ops.diseqc_recv_slave_reply)
2394                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
2395                 break;
2396
2397         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2398                 if (fe->ops.enable_high_lnb_voltage)
2399                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
2400                 break;
2401
2402         case FE_SET_FRONTEND:
2403                 err = dvbv3_set_delivery_system(fe);
2404                 if (err)
2405                         break;
2406
2407                 err = dtv_property_cache_sync(fe, c, parg);
2408                 if (err)
2409                         break;
2410                 err = dtv_set_frontend(fe);
2411                 break;
2412         case FE_GET_EVENT:
2413                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
2414                 break;
2415
2416         case FE_GET_FRONTEND: {
2417                 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2418
2419                 /*
2420                  * Let's use our own copy of property cache, in order to
2421                  * avoid mangling with DTV zigzag logic, as drivers might
2422                  * return crap, if they don't check if the data is available
2423                  * before updating the properties cache.
2424                  */
2425                 err = dtv_get_frontend(fe, &getp, parg);
2426                 break;
2427         }
2428         case FE_SET_FRONTEND_TUNE_MODE:
2429                 fepriv->tune_mode_flags = (unsigned long) parg;
2430                 err = 0;
2431                 break;
2432         }
2433
2434         return err;
2435 }
2436
2437
2438 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2439 {
2440         struct dvb_device *dvbdev = file->private_data;
2441         struct dvb_frontend *fe = dvbdev->priv;
2442         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2443
2444         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2445
2446         poll_wait (file, &fepriv->events.wait_queue, wait);
2447
2448         if (fepriv->events.eventw != fepriv->events.eventr)
2449                 return (POLLIN | POLLRDNORM | POLLPRI);
2450
2451         return 0;
2452 }
2453
2454 static int dvb_frontend_open(struct inode *inode, struct file *file)
2455 {
2456         struct dvb_device *dvbdev = file->private_data;
2457         struct dvb_frontend *fe = dvbdev->priv;
2458         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2459         struct dvb_adapter *adapter = fe->dvb;
2460         int ret;
2461
2462         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2463         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2464                 return -ENODEV;
2465
2466         if (adapter->mfe_shared) {
2467                 mutex_lock (&adapter->mfe_lock);
2468
2469                 if (adapter->mfe_dvbdev == NULL)
2470                         adapter->mfe_dvbdev = dvbdev;
2471
2472                 else if (adapter->mfe_dvbdev != dvbdev) {
2473                         struct dvb_device
2474                                 *mfedev = adapter->mfe_dvbdev;
2475                         struct dvb_frontend
2476                                 *mfe = mfedev->priv;
2477                         struct dvb_frontend_private
2478                                 *mfepriv = mfe->frontend_priv;
2479                         int mferetry = (dvb_mfe_wait_time << 1);
2480
2481                         mutex_unlock (&adapter->mfe_lock);
2482                         while (mferetry-- && (mfedev->users != -1 ||
2483                                         mfepriv->thread != NULL)) {
2484                                 if(msleep_interruptible(500)) {
2485                                         if(signal_pending(current))
2486                                                 return -EINTR;
2487                                 }
2488                         }
2489
2490                         mutex_lock (&adapter->mfe_lock);
2491                         if(adapter->mfe_dvbdev != dvbdev) {
2492                                 mfedev = adapter->mfe_dvbdev;
2493                                 mfe = mfedev->priv;
2494                                 mfepriv = mfe->frontend_priv;
2495                                 if (mfedev->users != -1 ||
2496                                                 mfepriv->thread != NULL) {
2497                                         mutex_unlock (&adapter->mfe_lock);
2498                                         return -EBUSY;
2499                                 }
2500                                 adapter->mfe_dvbdev = dvbdev;
2501                         }
2502                 }
2503         }
2504
2505         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2506                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2507                         goto err0;
2508
2509                 /* If we took control of the bus, we need to force
2510                    reinitialization.  This is because many ts_bus_ctrl()
2511                    functions strobe the RESET pin on the demod, and if the
2512                    frontend thread already exists then the dvb_init() routine
2513                    won't get called (which is what usually does initial
2514                    register configuration). */
2515                 fepriv->reinitialise = 1;
2516         }
2517
2518         if ((ret = dvb_generic_open (inode, file)) < 0)
2519                 goto err1;
2520
2521         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2522                 /* normal tune mode when opened R/W */
2523                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2524                 fepriv->tone = -1;
2525                 fepriv->voltage = -1;
2526
2527 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2528                 if (fe->dvb->mdev && fe->dvb->mdev->enable_source) {
2529                         ret = fe->dvb->mdev->enable_source(dvbdev->entity,
2530                                                            &fepriv->pipe);
2531                         if (ret) {
2532                                 dev_err(fe->dvb->device,
2533                                         "Tuner is busy. Error %d\n", ret);
2534                                 goto err2;
2535                         }
2536                 }
2537 #endif
2538                 ret = dvb_frontend_start (fe);
2539                 if (ret)
2540                         goto err3;
2541
2542                 /*  empty event queue */
2543                 fepriv->events.eventr = fepriv->events.eventw = 0;
2544         }
2545
2546         if (adapter->mfe_shared)
2547                 mutex_unlock (&adapter->mfe_lock);
2548         return ret;
2549
2550 err3:
2551 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2552         if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
2553                 fe->dvb->mdev->disable_source(dvbdev->entity);
2554 err2:
2555 #endif
2556         dvb_generic_release(inode, file);
2557 err1:
2558         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2559                 fe->ops.ts_bus_ctrl(fe, 0);
2560 err0:
2561         if (adapter->mfe_shared)
2562                 mutex_unlock (&adapter->mfe_lock);
2563         return ret;
2564 }
2565
2566 static int dvb_frontend_release(struct inode *inode, struct file *file)
2567 {
2568         struct dvb_device *dvbdev = file->private_data;
2569         struct dvb_frontend *fe = dvbdev->priv;
2570         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2571         int ret;
2572
2573         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2574
2575         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2576                 fepriv->release_jiffies = jiffies;
2577                 mb();
2578         }
2579
2580         ret = dvb_generic_release (inode, file);
2581
2582         if (dvbdev->users == -1) {
2583                 wake_up(&fepriv->wait_queue);
2584 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2585                 if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
2586                         fe->dvb->mdev->disable_source(dvbdev->entity);
2587 #endif
2588                 if (fe->exit != DVB_FE_NO_EXIT)
2589                         wake_up(&dvbdev->wait_queue);
2590                 if (fe->ops.ts_bus_ctrl)
2591                         fe->ops.ts_bus_ctrl(fe, 0);
2592         }
2593
2594         return ret;
2595 }
2596
2597 static const struct file_operations dvb_frontend_fops = {
2598         .owner          = THIS_MODULE,
2599         .unlocked_ioctl = dvb_generic_ioctl,
2600         .poll           = dvb_frontend_poll,
2601         .open           = dvb_frontend_open,
2602         .release        = dvb_frontend_release,
2603         .llseek         = noop_llseek,
2604 };
2605
2606 int dvb_frontend_suspend(struct dvb_frontend *fe)
2607 {
2608         int ret = 0;
2609
2610         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2611                         fe->id);
2612
2613         if (fe->ops.tuner_ops.suspend)
2614                 ret = fe->ops.tuner_ops.suspend(fe);
2615         else if (fe->ops.tuner_ops.sleep)
2616                 ret = fe->ops.tuner_ops.sleep(fe);
2617
2618         if (fe->ops.sleep)
2619                 ret = fe->ops.sleep(fe);
2620
2621         return ret;
2622 }
2623 EXPORT_SYMBOL(dvb_frontend_suspend);
2624
2625 int dvb_frontend_resume(struct dvb_frontend *fe)
2626 {
2627         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2628         int ret = 0;
2629
2630         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2631                         fe->id);
2632
2633         fe->exit = DVB_FE_DEVICE_RESUME;
2634         if (fe->ops.init)
2635                 ret = fe->ops.init(fe);
2636
2637         if (fe->ops.tuner_ops.resume)
2638                 ret = fe->ops.tuner_ops.resume(fe);
2639         else if (fe->ops.tuner_ops.init)
2640                 ret = fe->ops.tuner_ops.init(fe);
2641
2642         if (fe->ops.set_tone && fepriv->tone != -1)
2643                 fe->ops.set_tone(fe, fepriv->tone);
2644         if (fe->ops.set_voltage && fepriv->voltage != -1)
2645                 fe->ops.set_voltage(fe, fepriv->voltage);
2646
2647         fe->exit = DVB_FE_NO_EXIT;
2648         fepriv->state = FESTATE_RETUNE;
2649         dvb_frontend_wakeup(fe);
2650
2651         return ret;
2652 }
2653 EXPORT_SYMBOL(dvb_frontend_resume);
2654
2655 int dvb_register_frontend(struct dvb_adapter* dvb,
2656                           struct dvb_frontend* fe)
2657 {
2658         struct dvb_frontend_private *fepriv;
2659         const struct dvb_device dvbdev_template = {
2660                 .users = ~0,
2661                 .writers = 1,
2662                 .readers = (~0)-1,
2663                 .fops = &dvb_frontend_fops,
2664 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2665                 .name = fe->ops.info.name,
2666 #endif
2667                 .kernel_ioctl = dvb_frontend_ioctl
2668         };
2669
2670         dev_dbg(dvb->device, "%s:\n", __func__);
2671
2672         if (mutex_lock_interruptible(&frontend_mutex))
2673                 return -ERESTARTSYS;
2674
2675         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2676         if (fe->frontend_priv == NULL) {
2677                 mutex_unlock(&frontend_mutex);
2678                 return -ENOMEM;
2679         }
2680         fepriv = fe->frontend_priv;
2681
2682         sema_init(&fepriv->sem, 1);
2683         init_waitqueue_head (&fepriv->wait_queue);
2684         init_waitqueue_head (&fepriv->events.wait_queue);
2685         mutex_init(&fepriv->events.mtx);
2686         fe->dvb = dvb;
2687         fepriv->inversion = INVERSION_OFF;
2688
2689         dev_info(fe->dvb->device,
2690                         "DVB: registering adapter %i frontend %i (%s)...\n",
2691                         fe->dvb->num, fe->id, fe->ops.info.name);
2692
2693         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2694                              fe, DVB_DEVICE_FRONTEND, 0);
2695
2696         /*
2697          * Initialize the cache to the proper values according with the
2698          * first supported delivery system (ops->delsys[0])
2699          */
2700
2701         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
2702         dvb_frontend_clear_cache(fe);
2703
2704         mutex_unlock(&frontend_mutex);
2705         return 0;
2706 }
2707 EXPORT_SYMBOL(dvb_register_frontend);
2708
2709 int dvb_unregister_frontend(struct dvb_frontend* fe)
2710 {
2711         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2712         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2713
2714         mutex_lock(&frontend_mutex);
2715         dvb_frontend_stop (fe);
2716         mutex_unlock(&frontend_mutex);
2717
2718         if (fepriv->dvbdev->users < -1)
2719                 wait_event(fepriv->dvbdev->wait_queue,
2720                                 fepriv->dvbdev->users==-1);
2721
2722         mutex_lock(&frontend_mutex);
2723         dvb_unregister_device (fepriv->dvbdev);
2724
2725         /* fe is invalid now */
2726         kfree(fepriv);
2727         mutex_unlock(&frontend_mutex);
2728         return 0;
2729 }
2730 EXPORT_SYMBOL(dvb_unregister_frontend);
2731
2732 #ifdef CONFIG_MEDIA_ATTACH
2733 void dvb_frontend_detach(struct dvb_frontend* fe)
2734 {
2735         void *ptr;
2736
2737         if (fe->ops.release_sec) {
2738                 fe->ops.release_sec(fe);
2739                 dvb_detach(fe->ops.release_sec);
2740         }
2741         if (fe->ops.tuner_ops.release) {
2742                 fe->ops.tuner_ops.release(fe);
2743                 dvb_detach(fe->ops.tuner_ops.release);
2744         }
2745         if (fe->ops.analog_ops.release) {
2746                 fe->ops.analog_ops.release(fe);
2747                 dvb_detach(fe->ops.analog_ops.release);
2748         }
2749         ptr = (void*)fe->ops.release;
2750         if (ptr) {
2751                 fe->ops.release(fe);
2752                 dvb_detach(ptr);
2753         }
2754 }
2755 #else
2756 void dvb_frontend_detach(struct dvb_frontend* fe)
2757 {
2758         if (fe->ops.release_sec)
2759                 fe->ops.release_sec(fe);
2760         if (fe->ops.tuner_ops.release)
2761                 fe->ops.tuner_ops.release(fe);
2762         if (fe->ops.analog_ops.release)
2763                 fe->ops.analog_ops.release(fe);
2764         if (fe->ops.release)
2765                 fe->ops.release(fe);
2766 }
2767 #endif
2768 EXPORT_SYMBOL(dvb_frontend_detach);