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 <asm/processor.h>
  44
  45 #include "dvb_frontend.h"
  46 #include "dvbdev.h"
  47 #include <linux/dvb/version.h>
  48
  49 static int dvb_frontend_debug;
  50 static int dvb_shutdown_timeout;
  51 static int dvb_force_auto_inversion;
  52 static int dvb_override_tune_delay;
  53 static int dvb_powerdown_on_sleep = 1;
  54 static int dvb_mfe_wait_time = 5;
  55
  56 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
  57 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
  58 module_param(dvb_shutdown_timeout, int, 0644);
  59 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
  60 module_param(dvb_force_auto_inversion, int, 0644);
  61 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
  62 module_param(dvb_override_tune_delay, int, 0644);
  63 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
  64 module_param(dvb_powerdown_on_sleep, int, 0644);
  65 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
  66 module_param(dvb_mfe_wait_time, int, 0644);
  67 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
  68
  69 #define FESTATE_IDLE 1
  70 #define FESTATE_RETUNE 2
  71 #define FESTATE_TUNING_FAST 4
  72 #define FESTATE_TUNING_SLOW 8
  73 #define FESTATE_TUNED 16
  74 #define FESTATE_ZIGZAG_FAST 32
  75 #define FESTATE_ZIGZAG_SLOW 64
  76 #define FESTATE_DISEQC 128
  77 #define FESTATE_ERROR 256
  78 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
  79 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
  80 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
  81 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
  82
  83 #define FE_ALGO_HW              1
  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         fe_status_t 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
 136 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 137 static int dtv_get_frontend(struct dvb_frontend *fe,
 138                             struct dvb_frontend_parameters *p_out);
 139 static int dtv_property_legacy_params_sync(struct dvb_frontend *fe,
 140                                            struct dvb_frontend_parameters *p);
 141
 142 static bool has_get_frontend(struct dvb_frontend *fe)
 143 {
 144         return fe->ops.get_frontend != NULL;
 145 }
 146
 147 /*
 148  * Due to DVBv3 API calls, a delivery system should be mapped into one of
 149  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
 150  * otherwise, a DVBv3 call will fail.
 151  */
 152 enum dvbv3_emulation_type {
 153         DVBV3_UNKNOWN,
 154         DVBV3_QPSK,
 155         DVBV3_QAM,
 156         DVBV3_OFDM,
 157         DVBV3_ATSC,
 158 };
 159
 160 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
 161 {
 162         switch (delivery_system) {
 163         case SYS_DVBC_ANNEX_A:
 164         case SYS_DVBC_ANNEX_C:
 165                 return DVBV3_QAM;
 166         case SYS_DVBS:
 167         case SYS_DVBS2:
 168         case SYS_TURBO:
 169         case SYS_ISDBS:
 170         case SYS_DSS:
 171                 return DVBV3_QPSK;
 172         case SYS_DVBT:
 173         case SYS_DVBT2:
 174         case SYS_ISDBT:
 175         case SYS_DTMB:
 176                 return DVBV3_OFDM;
 177         case SYS_ATSC:
 178         case SYS_ATSCMH:
 179         case SYS_DVBC_ANNEX_B:
 180                 return DVBV3_ATSC;
 181         case SYS_UNDEFINED:
 182         case SYS_ISDBC:
 183         case SYS_DVBH:
 184         case SYS_DAB:
 185         default:
 186                 /*
 187                  * Doesn't know how to emulate those types and/or
 188                  * there's no frontend driver from this type yet
 189                  * with some emulation code, so, we're not sure yet how
 190                  * to handle them, or they're not compatible with a DVBv3 call.
 191                  */
 192                 return DVBV3_UNKNOWN;
 193         }
 194 }
 195
 196 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 197 {
 198         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 199         struct dvb_fe_events *events = &fepriv->events;
 200         struct dvb_frontend_event *e;
 201         int wp;
 202
 203         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 204
 205         if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
 206                 dtv_get_frontend(fe, &fepriv->parameters_out);
 207
 208         mutex_lock(&events->mtx);
 209
 210         wp = (events->eventw + 1) % MAX_EVENT;
 211         if (wp == events->eventr) {
 212                 events->overflow = 1;
 213                 events->eventr = (events->eventr + 1) % MAX_EVENT;
 214         }
 215
 216         e = &events->events[events->eventw];
 217         e->status = status;
 218         e->parameters = fepriv->parameters_out;
 219
 220         events->eventw = wp;
 221
 222         mutex_unlock(&events->mtx);
 223
 224         wake_up_interruptible (&events->wait_queue);
 225 }
 226
 227 static int dvb_frontend_get_event(struct dvb_frontend *fe,
 228                             struct dvb_frontend_event *event, int flags)
 229 {
 230         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 231         struct dvb_fe_events *events = &fepriv->events;
 232
 233         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 234
 235         if (events->overflow) {
 236                 events->overflow = 0;
 237                 return -EOVERFLOW;
 238         }
 239
 240         if (events->eventw == events->eventr) {
 241                 int ret;
 242
 243                 if (flags & O_NONBLOCK)
 244                         return -EWOULDBLOCK;
 245
 246                 up(&fepriv->sem);
 247
 248                 ret = wait_event_interruptible (events->wait_queue,
 249                                                 events->eventw != events->eventr);
 250
 251                 if (down_interruptible (&fepriv->sem))
 252                         return -ERESTARTSYS;
 253
 254                 if (ret < 0)
 255                         return ret;
 256         }
 257
 258         mutex_lock(&events->mtx);
 259         *event = events->events[events->eventr];
 260         events->eventr = (events->eventr + 1) % MAX_EVENT;
 261         mutex_unlock(&events->mtx);
 262
 263         return 0;
 264 }
 265
 266 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
 267 {
 268         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 269         struct dvb_fe_events *events = &fepriv->events;
 270
 271         mutex_lock(&events->mtx);
 272         events->eventr = events->eventw;
 273         mutex_unlock(&events->mtx);
 274 }
 275
 276 static void dvb_frontend_init(struct dvb_frontend *fe)
 277 {
 278         dev_dbg(fe->dvb->device,
 279                         "%s: initialising adapter %i frontend %i (%s)...\n",
 280                         __func__, fe->dvb->num, fe->id, fe->ops.info.name);
 281
 282         if (fe->ops.init)
 283                 fe->ops.init(fe);
 284         if (fe->ops.tuner_ops.init) {
 285                 if (fe->ops.i2c_gate_ctrl)
 286                         fe->ops.i2c_gate_ctrl(fe, 1);
 287                 fe->ops.tuner_ops.init(fe);
 288                 if (fe->ops.i2c_gate_ctrl)
 289                         fe->ops.i2c_gate_ctrl(fe, 0);
 290         }
 291 }
 292
 293 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
 294 {
 295         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 296
 297         fepriv->reinitialise = 1;
 298         dvb_frontend_wakeup(fe);
 299 }
 300 EXPORT_SYMBOL(dvb_frontend_reinitialise);
 301
 302 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 303 {
 304         int q2;
 305         struct dvb_frontend *fe = fepriv->dvbdev->priv;
 306
 307         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 308
 309         if (locked)
 310                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
 311         else
 312                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
 313
 314         q2 = fepriv->quality - 128;
 315         q2 *= q2;
 316
 317         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
 318 }
 319
 320 /**
 321  * Performs automatic twiddling of frontend parameters.
 322  *
 323  * @param fe The frontend concerned.
 324  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
 325  * @returns Number of complete iterations that have been performed.
 326  */
 327 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
 328 {
 329         int autoinversion;
 330         int ready = 0;
 331         int fe_set_err = 0;
 332         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 333         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 334         int original_inversion = c->inversion;
 335         u32 original_frequency = c->frequency;
 336
 337         /* are we using autoinversion? */
 338         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 339                          (c->inversion == INVERSION_AUTO));
 340
 341         /* setup parameters correctly */
 342         while(!ready) {
 343                 /* calculate the lnb_drift */
 344                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
 345
 346                 /* wrap the auto_step if we've exceeded the maximum drift */
 347                 if (fepriv->lnb_drift > fepriv->max_drift) {
 348                         fepriv->auto_step = 0;
 349                         fepriv->auto_sub_step = 0;
 350                         fepriv->lnb_drift = 0;
 351                 }
 352
 353                 /* perform inversion and +/- zigzag */
 354                 switch(fepriv->auto_sub_step) {
 355                 case 0:
 356                         /* try with the current inversion and current drift setting */
 357                         ready = 1;
 358                         break;
 359
 360                 case 1:
 361                         if (!autoinversion) break;
 362
 363                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 364                         ready = 1;
 365                         break;
 366
 367                 case 2:
 368                         if (fepriv->lnb_drift == 0) break;
 369
 370                         fepriv->lnb_drift = -fepriv->lnb_drift;
 371                         ready = 1;
 372                         break;
 373
 374                 case 3:
 375                         if (fepriv->lnb_drift == 0) break;
 376                         if (!autoinversion) break;
 377
 378                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
 379                         fepriv->lnb_drift = -fepriv->lnb_drift;
 380                         ready = 1;
 381                         break;
 382
 383                 default:
 384                         fepriv->auto_step++;
 385                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
 386                         break;
 387                 }
 388
 389                 if (!ready) fepriv->auto_sub_step++;
 390         }
 391
 392         /* if this attempt would hit where we started, indicate a complete
 393          * iteration has occurred */
 394         if ((fepriv->auto_step == fepriv->started_auto_step) &&
 395             (fepriv->auto_sub_step == 0) && check_wrapped) {
 396                 return 1;
 397         }
 398
 399         dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \
 400                         "auto_sub_step:%i started_auto_step:%i\n",
 401                         __func__, fepriv->lnb_drift, fepriv->inversion,
 402                         fepriv->auto_step, fepriv->auto_sub_step,
 403                         fepriv->started_auto_step);
 404
 405         /* set the frontend itself */
 406         c->frequency += fepriv->lnb_drift;
 407         if (autoinversion)
 408                 c->inversion = fepriv->inversion;
 409         tmp = *c;
 410         if (fe->ops.set_frontend)
 411                 fe_set_err = fe->ops.set_frontend(fe);
 412         *c = tmp;
 413         if (fe_set_err < 0) {
 414                 fepriv->state = FESTATE_ERROR;
 415                 return fe_set_err;
 416         }
 417
 418         c->frequency = original_frequency;
 419         c->inversion = original_inversion;
 420
 421         fepriv->auto_sub_step++;
 422         return 0;
 423 }
 424
 425 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
 426 {
 427         fe_status_t s = 0;
 428         int retval = 0;
 429         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 430         struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
 431
 432         /* if we've got no parameters, just keep idling */
 433         if (fepriv->state & FESTATE_IDLE) {
 434                 fepriv->delay = 3*HZ;
 435                 fepriv->quality = 0;
 436                 return;
 437         }
 438
 439         /* in SCAN mode, we just set the frontend when asked and leave it alone */
 440         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
 441                 if (fepriv->state & FESTATE_RETUNE) {
 442                         tmp = *c;
 443                         if (fe->ops.set_frontend)
 444                                 retval = fe->ops.set_frontend(fe);
 445                         *c = tmp;
 446                         if (retval < 0)
 447                                 fepriv->state = FESTATE_ERROR;
 448                         else
 449                                 fepriv->state = FESTATE_TUNED;
 450                 }
 451                 fepriv->delay = 3*HZ;
 452                 fepriv->quality = 0;
 453                 return;
 454         }
 455
 456         /* get the frontend status */
 457         if (fepriv->state & FESTATE_RETUNE) {
 458                 s = 0;
 459         } else {
 460                 if (fe->ops.read_status)
 461                         fe->ops.read_status(fe, &s);
 462                 if (s != fepriv->status) {
 463                         dvb_frontend_add_event(fe, s);
 464                         fepriv->status = s;
 465                 }
 466         }
 467
 468         /* if we're not tuned, and we have a lock, move to the TUNED state */
 469         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
 470                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 471                 fepriv->state = FESTATE_TUNED;
 472
 473                 /* if we're tuned, then we have determined the correct inversion */
 474                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
 475                     (c->inversion == INVERSION_AUTO)) {
 476                         c->inversion = fepriv->inversion;
 477                 }
 478                 return;
 479         }
 480
 481         /* if we are tuned already, check we're still locked */
 482         if (fepriv->state & FESTATE_TUNED) {
 483                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 484
 485                 /* we're tuned, and the lock is still good... */
 486                 if (s & FE_HAS_LOCK) {
 487                         return;
 488                 } else { /* if we _WERE_ tuned, but now don't have a lock */
 489                         fepriv->state = FESTATE_ZIGZAG_FAST;
 490                         fepriv->started_auto_step = fepriv->auto_step;
 491                         fepriv->check_wrapped = 0;
 492                 }
 493         }
 494
 495         /* don't actually do anything if we're in the LOSTLOCK state,
 496          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
 497         if ((fepriv->state & FESTATE_LOSTLOCK) &&
 498             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
 499                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 500                 return;
 501         }
 502
 503         /* don't do anything if we're in the DISEQC state, since this
 504          * might be someone with a motorized dish controlled by DISEQC.
 505          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
 506         if (fepriv->state & FESTATE_DISEQC) {
 507                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 508                 return;
 509         }
 510
 511         /* if we're in the RETUNE state, set everything up for a brand
 512          * new scan, keeping the current inversion setting, as the next
 513          * tune is _very_ likely to require the same */
 514         if (fepriv->state & FESTATE_RETUNE) {
 515                 fepriv->lnb_drift = 0;
 516                 fepriv->auto_step = 0;
 517                 fepriv->auto_sub_step = 0;
 518                 fepriv->started_auto_step = 0;
 519                 fepriv->check_wrapped = 0;
 520         }
 521
 522         /* fast zigzag. */
 523         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
 524                 fepriv->delay = fepriv->min_delay;
 525
 526                 /* perform a tune */
 527                 retval = dvb_frontend_swzigzag_autotune(fe,
 528                                                         fepriv->check_wrapped);
 529                 if (retval < 0) {
 530                         return;
 531                 } else if (retval) {
 532                         /* OK, if we've run out of trials at the fast speed.
 533                          * Drop back to slow for the _next_ attempt */
 534                         fepriv->state = FESTATE_SEARCHING_SLOW;
 535                         fepriv->started_auto_step = fepriv->auto_step;
 536                         return;
 537                 }
 538                 fepriv->check_wrapped = 1;
 539
 540                 /* if we've just retuned, enter the ZIGZAG_FAST state.
 541                  * This ensures we cannot return from an
 542                  * FE_SET_FRONTEND ioctl before the first frontend tune
 543                  * occurs */
 544                 if (fepriv->state & FESTATE_RETUNE) {
 545                         fepriv->state = FESTATE_TUNING_FAST;
 546                 }
 547         }
 548
 549         /* slow zigzag */
 550         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
 551                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
 552
 553                 /* Note: don't bother checking for wrapping; we stay in this
 554                  * state until we get a lock */
 555                 dvb_frontend_swzigzag_autotune(fe, 0);
 556         }
 557 }
 558
 559 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
 560 {
 561         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 562
 563         if (fe->exit != DVB_FE_NO_EXIT)
 564                 return 1;
 565
 566         if (fepriv->dvbdev->writers == 1)
 567                 if (time_after_eq(jiffies, fepriv->release_jiffies +
 568                                   dvb_shutdown_timeout * HZ))
 569                         return 1;
 570
 571         return 0;
 572 }
 573
 574 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
 575 {
 576         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 577
 578         if (fepriv->wakeup) {
 579                 fepriv->wakeup = 0;
 580                 return 1;
 581         }
 582         return dvb_frontend_is_exiting(fe);
 583 }
 584
 585 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
 586 {
 587         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 588
 589         fepriv->wakeup = 1;
 590         wake_up_interruptible(&fepriv->wait_queue);
 591 }
 592
 593 /**
 594  * dvb_enable_media_tuner() - tries to enable the DVB tuner
 595  *
 596  * @fe:         struct dvb_frontend pointer
 597  *
 598  * This function ensures that just one media tuner is enabled for a given
 599  * frontend. It has two different behaviors:
 600  * - For trivial devices with just one tuner:
 601  *   it just enables the existing tuner->fe link
 602  * - For devices with more than one tuner:
 603  *   It is up to the driver to implement the logic that will enable one tuner
 604  *   and disable the other ones. However, if more than one tuner is enabled for
 605  *   the same frontend, it will print an error message and return -EINVAL.
 606  *
 607  * At return, it will return the error code returned by media_entity_setup_link,
 608  * or 0 if everything is OK, if no tuner is linked to the frontend or if the
 609  * mdev is NULL.
 610  */
 611 static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 612 {
 613 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 614         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 615         struct dvb_adapter *adapter = fe->dvb;
 616         struct media_device *mdev = adapter->mdev;
 617         struct media_entity  *entity, *source;
 618         struct media_link *link, *found_link = NULL;
 619         int i, ret, n_links = 0, active_links = 0;
 620
 621         if (!mdev)
 622                 return 0;
 623
 624         entity = fepriv->dvbdev->entity;
 625         for (i = 0; i < entity->num_links; i++) {
 626                 link = &entity->links[i];
 627                 if (link->sink->entity == entity) {
 628                         found_link = link;
 629                         n_links++;
 630                         if (link->flags & MEDIA_LNK_FL_ENABLED)
 631                                 active_links++;
 632                 }
 633         }
 634
 635         if (!n_links || active_links == 1 || !found_link)
 636                 return 0;
 637
 638         /*
 639          * If a frontend has more than one tuner linked, it is up to the driver
 640          * to select with one will be the active one, as the frontend core can't
 641          * guess. If the driver doesn't do that, it is a bug.
 642          */
 643         if (n_links > 1 && active_links != 1) {
 644                 dev_err(fe->dvb->device,
 645                         "WARNING: there are %d active links among %d tuners. This is a driver's bug!\n",
 646                         active_links, n_links);
 647                 return -EINVAL;
 648         }
 649
 650         source = found_link->source->entity;
 651         for (i = 0; i < source->num_links; i++) {
 652                 struct media_entity *sink;
 653                 int flags = 0;
 654
 655                 link = &source->links[i];
 656                 sink = link->sink->entity;
 657
 658                 if (sink == entity)
 659                         flags = MEDIA_LNK_FL_ENABLED;
 660
 661                 ret = media_entity_setup_link(link, flags);
 662                 if (ret) {
 663                         dev_err(fe->dvb->device,
 664                                 "Couldn't change link %s->%s to %s. Error %d\n",
 665                                 source->name, sink->name,
 666                                 flags ? "enabled" : "disabled",
 667                                 ret);
 668                         return ret;
 669                 } else
 670                         dev_dbg(fe->dvb->device,
 671                                 "link %s->%s was %s\n",
 672                                 source->name, sink->name,
 673                                 flags ? "ENABLED" : "disabled");
 674         }
 675 #endif
 676         return 0;
 677 }
 678
 679 static int dvb_frontend_thread(void *data)
 680 {
 681         struct dvb_frontend *fe = data;
 682         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 683         fe_status_t s;
 684         enum dvbfe_algo algo;
 685         int ret;
 686
 687         bool re_tune = false;
 688         bool semheld = false;
 689
 690         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 691
 692         fepriv->check_wrapped = 0;
 693         fepriv->quality = 0;
 694         fepriv->delay = 3*HZ;
 695         fepriv->status = 0;
 696         fepriv->wakeup = 0;
 697         fepriv->reinitialise = 0;
 698
 699         ret = dvb_enable_media_tuner(fe);
 700         if (ret) {
 701                 /* FIXME: return an error if it fails */
 702                 dev_info(fe->dvb->device,
 703                         "proceeding with FE task\n");
 704         }
 705
 706         dvb_frontend_init(fe);
 707
 708         set_freezable();
 709         while (1) {
 710                 up(&fepriv->sem);           /* is locked when we enter the thread... */
 711 restart:
 712                 wait_event_interruptible_timeout(fepriv->wait_queue,
 713                         dvb_frontend_should_wakeup(fe) || kthread_should_stop()
 714                                 || freezing(current),
 715                         fepriv->delay);
 716
 717                 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 718                         /* got signal or quitting */
 719                         if (!down_interruptible(&fepriv->sem))
 720                                 semheld = true;
 721                         fe->exit = DVB_FE_NORMAL_EXIT;
 722                         break;
 723                 }
 724
 725                 if (try_to_freeze())
 726                         goto restart;
 727
 728                 if (down_interruptible(&fepriv->sem))
 729                         break;
 730
 731                 if (fepriv->reinitialise) {
 732                         dvb_frontend_init(fe);
 733                         if (fe->ops.set_tone && fepriv->tone != -1)
 734                                 fe->ops.set_tone(fe, fepriv->tone);
 735                         if (fe->ops.set_voltage && fepriv->voltage != -1)
 736                                 fe->ops.set_voltage(fe, fepriv->voltage);
 737                         fepriv->reinitialise = 0;
 738                 }
 739
 740                 /* do an iteration of the tuning loop */
 741                 if (fe->ops.get_frontend_algo) {
 742                         algo = fe->ops.get_frontend_algo(fe);
 743                         switch (algo) {
 744                         case DVBFE_ALGO_HW:
 745                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
 746
 747                                 if (fepriv->state & FESTATE_RETUNE) {
 748                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
 749                                         re_tune = true;
 750                                         fepriv->state = FESTATE_TUNED;
 751                                 } else {
 752                                         re_tune = false;
 753                                 }
 754
 755                                 if (fe->ops.tune)
 756                                         fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
 757
 758                                 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
 759                                         dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
 760                                         dvb_frontend_add_event(fe, s);
 761                                         fepriv->status = s;
 762                                 }
 763                                 break;
 764                         case DVBFE_ALGO_SW:
 765                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
 766                                 dvb_frontend_swzigzag(fe);
 767                                 break;
 768                         case DVBFE_ALGO_CUSTOM:
 769                                 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
 770                                 if (fepriv->state & FESTATE_RETUNE) {
 771                                         dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
 772                                         fepriv->state = FESTATE_TUNED;
 773                                 }
 774                                 /* Case where we are going to search for a carrier
 775                                  * User asked us to retune again for some reason, possibly
 776                                  * requesting a search with a new set of parameters
 777                                  */
 778                                 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
 779                                         if (fe->ops.search) {
 780                                                 fepriv->algo_status = fe->ops.search(fe);
 781                                                 /* We did do a search as was requested, the flags are
 782                                                  * now unset as well and has the flags wrt to search.
 783                                                  */
 784                                         } else {
 785                                                 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
 786                                         }
 787                                 }
 788                                 /* Track the carrier if the search was successful */
 789                                 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
 790                                         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 791                                         fepriv->delay = HZ / 2;
 792                                 }
 793                                 dtv_property_legacy_params_sync(fe, &fepriv->parameters_out);
 794                                 fe->ops.read_status(fe, &s);
 795                                 if (s != fepriv->status) {
 796                                         dvb_frontend_add_event(fe, s); /* update event list */
 797                                         fepriv->status = s;
 798                                         if (!(s & FE_HAS_LOCK)) {
 799                                                 fepriv->delay = HZ / 10;
 800                                                 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
 801                                         } else {
 802                                                 fepriv->delay = 60 * HZ;
 803                                         }
 804                                 }
 805                                 break;
 806                         default:
 807                                 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
 808                                 break;
 809                         }
 810                 } else {
 811                         dvb_frontend_swzigzag(fe);
 812                 }
 813         }
 814
 815         if (dvb_powerdown_on_sleep) {
 816                 if (fe->ops.set_voltage)
 817                         fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
 818                 if (fe->ops.tuner_ops.sleep) {
 819                         if (fe->ops.i2c_gate_ctrl)
 820                                 fe->ops.i2c_gate_ctrl(fe, 1);
 821                         fe->ops.tuner_ops.sleep(fe);
 822                         if (fe->ops.i2c_gate_ctrl)
 823                                 fe->ops.i2c_gate_ctrl(fe, 0);
 824                 }
 825                 if (fe->ops.sleep)
 826                         fe->ops.sleep(fe);
 827         }
 828
 829         fepriv->thread = NULL;
 830         if (kthread_should_stop())
 831                 fe->exit = DVB_FE_DEVICE_REMOVED;
 832         else
 833                 fe->exit = DVB_FE_NO_EXIT;
 834         mb();
 835
 836         if (semheld)
 837                 up(&fepriv->sem);
 838         dvb_frontend_wakeup(fe);
 839         return 0;
 840 }
 841
 842 static void dvb_frontend_stop(struct dvb_frontend *fe)
 843 {
 844         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 845
 846         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 847
 848         if (fe->exit != DVB_FE_DEVICE_REMOVED)
 849                 fe->exit = DVB_FE_NORMAL_EXIT;
 850         mb();
 851
 852         if (!fepriv->thread)
 853                 return;
 854
 855         kthread_stop(fepriv->thread);
 856
 857         sema_init(&fepriv->sem, 1);
 858         fepriv->state = FESTATE_IDLE;
 859
 860         /* paranoia check in case a signal arrived */
 861         if (fepriv->thread)
 862                 dev_warn(fe->dvb->device,
 863                                 "dvb_frontend_stop: warning: thread %p won't exit\n",
 864                                 fepriv->thread);
 865 }
 866
 867 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
 868 {
 869         return ((curtime.tv_usec < lasttime.tv_usec) ?
 870                 1000000 - lasttime.tv_usec + curtime.tv_usec :
 871                 curtime.tv_usec - lasttime.tv_usec);
 872 }
 873 EXPORT_SYMBOL(timeval_usec_diff);
 874
 875 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
 876 {
 877         curtime->tv_usec += add_usec;
 878         if (curtime->tv_usec >= 1000000) {
 879                 curtime->tv_usec -= 1000000;
 880                 curtime->tv_sec++;
 881         }
 882 }
 883
 884 /*
 885  * Sleep until gettimeofday() > waketime + add_usec
 886  * This needs to be as precise as possible, but as the delay is
 887  * usually between 2ms and 32ms, it is done using a scheduled msleep
 888  * followed by usleep (normally a busy-wait loop) for the remainder
 889  */
 890 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
 891 {
 892         struct timeval lasttime;
 893         s32 delta, newdelta;
 894
 895         timeval_usec_add(waketime, add_usec);
 896
 897         do_gettimeofday(&lasttime);
 898         delta = timeval_usec_diff(lasttime, *waketime);
 899         if (delta > 2500) {
 900                 msleep((delta - 1500) / 1000);
 901                 do_gettimeofday(&lasttime);
 902                 newdelta = timeval_usec_diff(lasttime, *waketime);
 903                 delta = (newdelta > delta) ? 0 : newdelta;
 904         }
 905         if (delta > 0)
 906                 udelay(delta);
 907 }
 908 EXPORT_SYMBOL(dvb_frontend_sleep_until);
 909
 910 static int dvb_frontend_start(struct dvb_frontend *fe)
 911 {
 912         int ret;
 913         struct dvb_frontend_private *fepriv = fe->frontend_priv;
 914         struct task_struct *fe_thread;
 915
 916         dev_dbg(fe->dvb->device, "%s:\n", __func__);
 917
 918         if (fepriv->thread) {
 919                 if (fe->exit == DVB_FE_NO_EXIT)
 920                         return 0;
 921                 else
 922                         dvb_frontend_stop (fe);
 923         }
 924
 925         if (signal_pending(current))
 926                 return -EINTR;
 927         if (down_interruptible (&fepriv->sem))
 928                 return -EINTR;
 929
 930         fepriv->state = FESTATE_IDLE;
 931         fe->exit = DVB_FE_NO_EXIT;
 932         fepriv->thread = NULL;
 933         mb();
 934
 935         fe_thread = kthread_run(dvb_frontend_thread, fe,
 936                 "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id);
 937         if (IS_ERR(fe_thread)) {
 938                 ret = PTR_ERR(fe_thread);
 939                 dev_warn(fe->dvb->device,
 940                                 "dvb_frontend_start: failed to start kthread (%d)\n",
 941                                 ret);
 942                 up(&fepriv->sem);
 943                 return ret;
 944         }
 945         fepriv->thread = fe_thread;
 946         return 0;
 947 }
 948
 949 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
 950                                         u32 *freq_min, u32 *freq_max)
 951 {
 952         *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min);
 953
 954         if (fe->ops.info.frequency_max == 0)
 955                 *freq_max = fe->ops.tuner_ops.info.frequency_max;
 956         else if (fe->ops.tuner_ops.info.frequency_max == 0)
 957                 *freq_max = fe->ops.info.frequency_max;
 958         else
 959                 *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max);
 960
 961         if (*freq_min == 0 || *freq_max == 0)
 962                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
 963                                 fe->dvb->num, fe->id);
 964 }
 965
 966 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
 967 {
 968         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 969         u32 freq_min;
 970         u32 freq_max;
 971
 972         /* range check: frequency */
 973         dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max);
 974         if ((freq_min && c->frequency < freq_min) ||
 975             (freq_max && c->frequency > freq_max)) {
 976                 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
 977                                 fe->dvb->num, fe->id, c->frequency,
 978                                 freq_min, freq_max);
 979                 return -EINVAL;
 980         }
 981
 982         /* range check: symbol rate */
 983         switch (c->delivery_system) {
 984         case SYS_DVBS:
 985         case SYS_DVBS2:
 986         case SYS_TURBO:
 987         case SYS_DVBC_ANNEX_A:
 988         case SYS_DVBC_ANNEX_C:
 989                 if ((fe->ops.info.symbol_rate_min &&
 990                      c->symbol_rate < fe->ops.info.symbol_rate_min) ||
 991                     (fe->ops.info.symbol_rate_max &&
 992                      c->symbol_rate > fe->ops.info.symbol_rate_max)) {
 993                         dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
 994                                         fe->dvb->num, fe->id, c->symbol_rate,
 995                                         fe->ops.info.symbol_rate_min,
 996                                         fe->ops.info.symbol_rate_max);
 997                         return -EINVAL;
 998                 }
 999         default:
1000                 break;
1001         }
1002
1003         return 0;
1004 }
1005
1006 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1007 {
1008         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1009         int i;
1010         u32 delsys;
1011
1012         delsys = c->delivery_system;
1013         memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1014         c->delivery_system = delsys;
1015
1016         c->state = DTV_CLEAR;
1017
1018         dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1019                         __func__, c->delivery_system);
1020
1021         c->transmission_mode = TRANSMISSION_MODE_AUTO;
1022         c->bandwidth_hz = 0;    /* AUTO */
1023         c->guard_interval = GUARD_INTERVAL_AUTO;
1024         c->hierarchy = HIERARCHY_AUTO;
1025         c->symbol_rate = 0;
1026         c->code_rate_HP = FEC_AUTO;
1027         c->code_rate_LP = FEC_AUTO;
1028         c->fec_inner = FEC_AUTO;
1029         c->rolloff = ROLLOFF_AUTO;
1030         c->voltage = SEC_VOLTAGE_OFF;
1031         c->sectone = SEC_TONE_OFF;
1032         c->pilot = PILOT_AUTO;
1033
1034         c->isdbt_partial_reception = 0;
1035         c->isdbt_sb_mode = 0;
1036         c->isdbt_sb_subchannel = 0;
1037         c->isdbt_sb_segment_idx = 0;
1038         c->isdbt_sb_segment_count = 0;
1039         c->isdbt_layer_enabled = 0;
1040         for (i = 0; i < 3; i++) {
1041                 c->layer[i].fec = FEC_AUTO;
1042                 c->layer[i].modulation = QAM_AUTO;
1043                 c->layer[i].interleaving = 0;
1044                 c->layer[i].segment_count = 0;
1045         }
1046
1047         c->stream_id = NO_STREAM_ID_FILTER;
1048
1049         switch (c->delivery_system) {
1050         case SYS_DVBS:
1051         case SYS_DVBS2:
1052         case SYS_TURBO:
1053                 c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1054                 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1055                 break;
1056         case SYS_ATSC:
1057                 c->modulation = VSB_8;
1058                 break;
1059         case SYS_ISDBS:
1060                 c->symbol_rate = 28860000;
1061                 c->rolloff = ROLLOFF_35;
1062                 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1063                 break;
1064         default:
1065                 c->modulation = QAM_AUTO;
1066                 break;
1067         }
1068
1069         c->lna = LNA_AUTO;
1070
1071         return 0;
1072 }
1073
1074 #define _DTV_CMD(n, s, b) \
1075 [n] = { \
1076         .name = #n, \
1077         .cmd  = n, \
1078         .set  = s,\
1079         .buffer = b \
1080 }
1081
1082 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1083         _DTV_CMD(DTV_TUNE, 1, 0),
1084         _DTV_CMD(DTV_CLEAR, 1, 0),
1085
1086         /* Set */
1087         _DTV_CMD(DTV_FREQUENCY, 1, 0),
1088         _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1089         _DTV_CMD(DTV_MODULATION, 1, 0),
1090         _DTV_CMD(DTV_INVERSION, 1, 0),
1091         _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1092         _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1093         _DTV_CMD(DTV_INNER_FEC, 1, 0),
1094         _DTV_CMD(DTV_VOLTAGE, 1, 0),
1095         _DTV_CMD(DTV_TONE, 1, 0),
1096         _DTV_CMD(DTV_PILOT, 1, 0),
1097         _DTV_CMD(DTV_ROLLOFF, 1, 0),
1098         _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1099         _DTV_CMD(DTV_HIERARCHY, 1, 0),
1100         _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1101         _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1102         _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1103         _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1104         _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1105
1106         _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1107         _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1108         _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1109         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1110         _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1111         _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1112         _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1113         _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1114         _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1115         _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1116         _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1117         _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1118         _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1119         _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1120         _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1121         _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1122         _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1123         _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1124
1125         _DTV_CMD(DTV_STREAM_ID, 1, 0),
1126         _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1127         _DTV_CMD(DTV_LNA, 1, 0),
1128
1129         /* Get */
1130         _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1131         _DTV_CMD(DTV_API_VERSION, 0, 0),
1132
1133         _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1134
1135         _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1136         _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1137
1138         _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1139         _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1140         _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1141         _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1142         _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1143         _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1144         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1145         _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1146         _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1147         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1148         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1149         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1150         _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1151
1152         /* Statistics API */
1153         _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1154         _DTV_CMD(DTV_STAT_CNR, 0, 0),
1155         _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1156         _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1157         _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1158         _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1159         _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1160         _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1161 };
1162
1163 static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp)
1164 {
1165         int i;
1166
1167         if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) {
1168                 dev_warn(fe->dvb->device, "%s: tvp.cmd = 0x%08x undefined\n",
1169                                 __func__, tvp->cmd);
1170                 return;
1171         }
1172
1173         dev_dbg(fe->dvb->device, "%s: tvp.cmd    = 0x%08x (%s)\n", __func__,
1174                         tvp->cmd, dtv_cmds[tvp->cmd].name);
1175
1176         if (dtv_cmds[tvp->cmd].buffer) {
1177                 dev_dbg(fe->dvb->device, "%s: tvp.u.buffer.len = 0x%02x\n",
1178                         __func__, tvp->u.buffer.len);
1179
1180                 for(i = 0; i < tvp->u.buffer.len; i++)
1181                         dev_dbg(fe->dvb->device,
1182                                         "%s: tvp.u.buffer.data[0x%02x] = 0x%02x\n",
1183                                         __func__, i, tvp->u.buffer.data[i]);
1184         } else {
1185                 dev_dbg(fe->dvb->device, "%s: tvp.u.data = 0x%08x\n", __func__,
1186                                 tvp->u.data);
1187         }
1188 }
1189
1190 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1191  * drivers can use a single set_frontend tuning function, regardless of whether
1192  * it's being used for the legacy or new API, reducing code and complexity.
1193  */
1194 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1195                                    struct dtv_frontend_properties *c,
1196                                    const struct dvb_frontend_parameters *p)
1197 {
1198         c->frequency = p->frequency;
1199         c->inversion = p->inversion;
1200
1201         switch (dvbv3_type(c->delivery_system)) {
1202         case DVBV3_QPSK:
1203                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1204                 c->symbol_rate = p->u.qpsk.symbol_rate;
1205                 c->fec_inner = p->u.qpsk.fec_inner;
1206                 break;
1207         case DVBV3_QAM:
1208                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1209                 c->symbol_rate = p->u.qam.symbol_rate;
1210                 c->fec_inner = p->u.qam.fec_inner;
1211                 c->modulation = p->u.qam.modulation;
1212                 break;
1213         case DVBV3_OFDM:
1214                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1215
1216                 switch (p->u.ofdm.bandwidth) {
1217                 case BANDWIDTH_10_MHZ:
1218                         c->bandwidth_hz = 10000000;
1219                         break;
1220                 case BANDWIDTH_8_MHZ:
1221                         c->bandwidth_hz = 8000000;
1222                         break;
1223                 case BANDWIDTH_7_MHZ:
1224                         c->bandwidth_hz = 7000000;
1225                         break;
1226                 case BANDWIDTH_6_MHZ:
1227                         c->bandwidth_hz = 6000000;
1228                         break;
1229                 case BANDWIDTH_5_MHZ:
1230                         c->bandwidth_hz = 5000000;
1231                         break;
1232                 case BANDWIDTH_1_712_MHZ:
1233                         c->bandwidth_hz = 1712000;
1234                         break;
1235                 case BANDWIDTH_AUTO:
1236                         c->bandwidth_hz = 0;
1237                 }
1238
1239                 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1240                 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1241                 c->modulation = p->u.ofdm.constellation;
1242                 c->transmission_mode = p->u.ofdm.transmission_mode;
1243                 c->guard_interval = p->u.ofdm.guard_interval;
1244                 c->hierarchy = p->u.ofdm.hierarchy_information;
1245                 break;
1246         case DVBV3_ATSC:
1247                 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1248                 c->modulation = p->u.vsb.modulation;
1249                 if (c->delivery_system == SYS_ATSCMH)
1250                         break;
1251                 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1252                         c->delivery_system = SYS_ATSC;
1253                 else
1254                         c->delivery_system = SYS_DVBC_ANNEX_B;
1255                 break;
1256         case DVBV3_UNKNOWN:
1257                 dev_err(fe->dvb->device,
1258                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1259                                 __func__, c->delivery_system);
1260                 return -EINVAL;
1261         }
1262
1263         return 0;
1264 }
1265
1266 /* Ensure the cached values are set correctly in the frontend
1267  * legacy tuning structures, for the advanced tuning API.
1268  */
1269 static int dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1270                                             struct dvb_frontend_parameters *p)
1271 {
1272         const struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1273
1274         p->frequency = c->frequency;
1275         p->inversion = c->inversion;
1276
1277         switch (dvbv3_type(c->delivery_system)) {
1278         case DVBV3_UNKNOWN:
1279                 dev_err(fe->dvb->device,
1280                                 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1281                                 __func__, c->delivery_system);
1282                 return -EINVAL;
1283         case DVBV3_QPSK:
1284                 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1285                 p->u.qpsk.symbol_rate = c->symbol_rate;
1286                 p->u.qpsk.fec_inner = c->fec_inner;
1287                 break;
1288         case DVBV3_QAM:
1289                 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1290                 p->u.qam.symbol_rate = c->symbol_rate;
1291                 p->u.qam.fec_inner = c->fec_inner;
1292                 p->u.qam.modulation = c->modulation;
1293                 break;
1294         case DVBV3_OFDM:
1295                 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1296                 switch (c->bandwidth_hz) {
1297                 case 10000000:
1298                         p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1299                         break;
1300                 case 8000000:
1301                         p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1302                         break;
1303                 case 7000000:
1304                         p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1305                         break;
1306                 case 6000000:
1307                         p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1308                         break;
1309                 case 5000000:
1310                         p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1311                         break;
1312                 case 1712000:
1313                         p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1314                         break;
1315                 case 0:
1316                 default:
1317                         p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1318                 }
1319                 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1320                 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1321                 p->u.ofdm.constellation = c->modulation;
1322                 p->u.ofdm.transmission_mode = c->transmission_mode;
1323                 p->u.ofdm.guard_interval = c->guard_interval;
1324                 p->u.ofdm.hierarchy_information = c->hierarchy;
1325                 break;
1326         case DVBV3_ATSC:
1327                 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1328                 p->u.vsb.modulation = c->modulation;
1329                 break;
1330         }
1331         return 0;
1332 }
1333
1334 /**
1335  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1336  * @fe:         struct dvb_frontend pointer
1337  * @c:          struct dtv_frontend_properties pointer (DVBv5 cache)
1338  * @p_out       struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1339  *
1340  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1341  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1342  * If p_out is not null, it will update the DVBv3 params pointed by it.
1343  */
1344 static int dtv_get_frontend(struct dvb_frontend *fe,
1345                             struct dvb_frontend_parameters *p_out)
1346 {
1347         int r;
1348
1349         if (fe->ops.get_frontend) {
1350                 r = fe->ops.get_frontend(fe);
1351                 if (unlikely(r < 0))
1352                         return r;
1353                 if (p_out)
1354                         dtv_property_legacy_params_sync(fe, p_out);
1355                 return 0;
1356         }
1357
1358         /* As everything is in cache, get_frontend fops are always supported */
1359         return 0;
1360 }
1361
1362 static int dvb_frontend_ioctl_legacy(struct file *file,
1363                         unsigned int cmd, void *parg);
1364 static int dvb_frontend_ioctl_properties(struct file *file,
1365                         unsigned int cmd, void *parg);
1366
1367 static int dtv_property_process_get(struct dvb_frontend *fe,
1368                                     const struct dtv_frontend_properties *c,
1369                                     struct dtv_property *tvp,
1370                                     struct file *file)
1371 {
1372         int r, ncaps;
1373
1374         switch(tvp->cmd) {
1375         case DTV_ENUM_DELSYS:
1376                 ncaps = 0;
1377                 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1378                         tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1379                         ncaps++;
1380                 }
1381                 tvp->u.buffer.len = ncaps;
1382                 break;
1383         case DTV_FREQUENCY:
1384                 tvp->u.data = c->frequency;
1385                 break;
1386         case DTV_MODULATION:
1387                 tvp->u.data = c->modulation;
1388                 break;
1389         case DTV_BANDWIDTH_HZ:
1390                 tvp->u.data = c->bandwidth_hz;
1391                 break;
1392         case DTV_INVERSION:
1393                 tvp->u.data = c->inversion;
1394                 break;
1395         case DTV_SYMBOL_RATE:
1396                 tvp->u.data = c->symbol_rate;
1397                 break;
1398         case DTV_INNER_FEC:
1399                 tvp->u.data = c->fec_inner;
1400                 break;
1401         case DTV_PILOT:
1402                 tvp->u.data = c->pilot;
1403                 break;
1404         case DTV_ROLLOFF:
1405                 tvp->u.data = c->rolloff;
1406                 break;
1407         case DTV_DELIVERY_SYSTEM:
1408                 tvp->u.data = c->delivery_system;
1409                 break;
1410         case DTV_VOLTAGE:
1411                 tvp->u.data = c->voltage;
1412                 break;
1413         case DTV_TONE:
1414                 tvp->u.data = c->sectone;
1415                 break;
1416         case DTV_API_VERSION:
1417                 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1418                 break;
1419         case DTV_CODE_RATE_HP:
1420                 tvp->u.data = c->code_rate_HP;
1421                 break;
1422         case DTV_CODE_RATE_LP:
1423                 tvp->u.data = c->code_rate_LP;
1424                 break;
1425         case DTV_GUARD_INTERVAL:
1426                 tvp->u.data = c->guard_interval;
1427                 break;
1428         case DTV_TRANSMISSION_MODE:
1429                 tvp->u.data = c->transmission_mode;
1430                 break;
1431         case DTV_HIERARCHY:
1432                 tvp->u.data = c->hierarchy;
1433                 break;
1434         case DTV_INTERLEAVING:
1435                 tvp->u.data = c->interleaving;
1436                 break;
1437
1438         /* ISDB-T Support here */
1439         case DTV_ISDBT_PARTIAL_RECEPTION:
1440                 tvp->u.data = c->isdbt_partial_reception;
1441                 break;
1442         case DTV_ISDBT_SOUND_BROADCASTING:
1443                 tvp->u.data = c->isdbt_sb_mode;
1444                 break;
1445         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1446                 tvp->u.data = c->isdbt_sb_subchannel;
1447                 break;
1448         case DTV_ISDBT_SB_SEGMENT_IDX:
1449                 tvp->u.data = c->isdbt_sb_segment_idx;
1450                 break;
1451         case DTV_ISDBT_SB_SEGMENT_COUNT:
1452                 tvp->u.data = c->isdbt_sb_segment_count;
1453                 break;
1454         case DTV_ISDBT_LAYER_ENABLED:
1455                 tvp->u.data = c->isdbt_layer_enabled;
1456                 break;
1457         case DTV_ISDBT_LAYERA_FEC:
1458                 tvp->u.data = c->layer[0].fec;
1459                 break;
1460         case DTV_ISDBT_LAYERA_MODULATION:
1461                 tvp->u.data = c->layer[0].modulation;
1462                 break;
1463         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1464                 tvp->u.data = c->layer[0].segment_count;
1465                 break;
1466         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1467                 tvp->u.data = c->layer[0].interleaving;
1468                 break;
1469         case DTV_ISDBT_LAYERB_FEC:
1470                 tvp->u.data = c->layer[1].fec;
1471                 break;
1472         case DTV_ISDBT_LAYERB_MODULATION:
1473                 tvp->u.data = c->layer[1].modulation;
1474                 break;
1475         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1476                 tvp->u.data = c->layer[1].segment_count;
1477                 break;
1478         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1479                 tvp->u.data = c->layer[1].interleaving;
1480                 break;
1481         case DTV_ISDBT_LAYERC_FEC:
1482                 tvp->u.data = c->layer[2].fec;
1483                 break;
1484         case DTV_ISDBT_LAYERC_MODULATION:
1485                 tvp->u.data = c->layer[2].modulation;
1486                 break;
1487         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1488                 tvp->u.data = c->layer[2].segment_count;
1489                 break;
1490         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1491                 tvp->u.data = c->layer[2].interleaving;
1492                 break;
1493
1494         /* Multistream support */
1495         case DTV_STREAM_ID:
1496         case DTV_DVBT2_PLP_ID_LEGACY:
1497                 tvp->u.data = c->stream_id;
1498                 break;
1499
1500         /* ATSC-MH */
1501         case DTV_ATSCMH_FIC_VER:
1502                 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1503                 break;
1504         case DTV_ATSCMH_PARADE_ID:
1505                 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1506                 break;
1507         case DTV_ATSCMH_NOG:
1508                 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1509                 break;
1510         case DTV_ATSCMH_TNOG:
1511                 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1512                 break;
1513         case DTV_ATSCMH_SGN:
1514                 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1515                 break;
1516         case DTV_ATSCMH_PRC:
1517                 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1518                 break;
1519         case DTV_ATSCMH_RS_FRAME_MODE:
1520                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1521                 break;
1522         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1523                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1524                 break;
1525         case DTV_ATSCMH_RS_CODE_MODE_PRI:
1526                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1527                 break;
1528         case DTV_ATSCMH_RS_CODE_MODE_SEC:
1529                 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1530                 break;
1531         case DTV_ATSCMH_SCCC_BLOCK_MODE:
1532                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1533                 break;
1534         case DTV_ATSCMH_SCCC_CODE_MODE_A:
1535                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1536                 break;
1537         case DTV_ATSCMH_SCCC_CODE_MODE_B:
1538                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1539                 break;
1540         case DTV_ATSCMH_SCCC_CODE_MODE_C:
1541                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1542                 break;
1543         case DTV_ATSCMH_SCCC_CODE_MODE_D:
1544                 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1545                 break;
1546
1547         case DTV_LNA:
1548                 tvp->u.data = c->lna;
1549                 break;
1550
1551         /* Fill quality measures */
1552         case DTV_STAT_SIGNAL_STRENGTH:
1553                 tvp->u.st = c->strength;
1554                 break;
1555         case DTV_STAT_CNR:
1556                 tvp->u.st = c->cnr;
1557                 break;
1558         case DTV_STAT_PRE_ERROR_BIT_COUNT:
1559                 tvp->u.st = c->pre_bit_error;
1560                 break;
1561         case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1562                 tvp->u.st = c->pre_bit_count;
1563                 break;
1564         case DTV_STAT_POST_ERROR_BIT_COUNT:
1565                 tvp->u.st = c->post_bit_error;
1566                 break;
1567         case DTV_STAT_POST_TOTAL_BIT_COUNT:
1568                 tvp->u.st = c->post_bit_count;
1569                 break;
1570         case DTV_STAT_ERROR_BLOCK_COUNT:
1571                 tvp->u.st = c->block_error;
1572                 break;
1573         case DTV_STAT_TOTAL_BLOCK_COUNT:
1574                 tvp->u.st = c->block_count;
1575                 break;
1576         default:
1577                 dev_dbg(fe->dvb->device,
1578                         "%s: FE property %d doesn't exist\n",
1579                         __func__, tvp->cmd);
1580                 return -EINVAL;
1581         }
1582
1583         /* Allow the frontend to override outgoing properties */
1584         if (fe->ops.get_property) {
1585                 r = fe->ops.get_property(fe, tvp);
1586                 if (r < 0)
1587                         return r;
1588         }
1589
1590         dtv_property_dump(fe, tvp);
1591
1592         return 0;
1593 }
1594
1595 static int dtv_set_frontend(struct dvb_frontend *fe);
1596
1597 static bool is_dvbv3_delsys(u32 delsys)
1598 {
1599         bool status;
1600
1601         status = (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1602                  (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1603
1604         return status;
1605 }
1606
1607 /**
1608  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1609  * @fe:                 struct frontend;
1610  * @delsys:                     DVBv5 type that will be used for emulation
1611  *
1612  * Provides emulation for delivery systems that are compatible with the old
1613  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1614  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1615  * parameters are compatible with DVB-S spec.
1616  */
1617 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1618 {
1619         int i;
1620         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1621
1622         c->delivery_system = delsys;
1623
1624         /*
1625          * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1626          */
1627         if (c->delivery_system == SYS_ISDBT) {
1628                 dev_dbg(fe->dvb->device,
1629                         "%s: Using defaults for SYS_ISDBT\n",
1630                         __func__);
1631
1632                 if (!c->bandwidth_hz)
1633                         c->bandwidth_hz = 6000000;
1634
1635                 c->isdbt_partial_reception = 0;
1636                 c->isdbt_sb_mode = 0;
1637                 c->isdbt_sb_subchannel = 0;
1638                 c->isdbt_sb_segment_idx = 0;
1639                 c->isdbt_sb_segment_count = 0;
1640                 c->isdbt_layer_enabled = 7;
1641                 for (i = 0; i < 3; i++) {
1642                         c->layer[i].fec = FEC_AUTO;
1643                         c->layer[i].modulation = QAM_AUTO;
1644                         c->layer[i].interleaving = 0;
1645                         c->layer[i].segment_count = 0;
1646                 }
1647         }
1648         dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1649                 __func__, c->delivery_system);
1650
1651         return 0;
1652 }
1653
1654 /**
1655  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1656  * @fe:                 frontend struct
1657  * @desired_system:     delivery system requested by the user
1658  *
1659  * A DVBv5 call know what's the desired system it wants. So, set it.
1660  *
1661  * There are, however, a few known issues with early DVBv5 applications that
1662  * are also handled by this logic:
1663  *
1664  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1665  *    This is an API violation, but, as we don't want to break userspace,
1666  *    convert it to the first supported delivery system.
1667  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1668  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1669  *    ISDB-T provided backward compat with DVB-T.
1670  */
1671 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1672                                      u32 desired_system)
1673 {
1674         int ncaps;
1675         u32 delsys = SYS_UNDEFINED;
1676         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1677         enum dvbv3_emulation_type type;
1678
1679         /*
1680          * It was reported that some old DVBv5 applications were
1681          * filling delivery_system with SYS_UNDEFINED. If this happens,
1682          * assume that the application wants to use the first supported
1683          * delivery system.
1684          */
1685         if (desired_system == SYS_UNDEFINED)
1686                 desired_system = fe->ops.delsys[0];
1687
1688         /*
1689          * This is a DVBv5 call. So, it likely knows the supported
1690          * delivery systems. So, check if the desired delivery system is
1691          * supported
1692          */
1693         ncaps = 0;
1694         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1695                 if (fe->ops.delsys[ncaps] == desired_system) {
1696                         c->delivery_system = desired_system;
1697                         dev_dbg(fe->dvb->device,
1698                                         "%s: Changing delivery system to %d\n",
1699                                         __func__, desired_system);
1700                         return 0;
1701                 }
1702                 ncaps++;
1703         }
1704
1705         /*
1706          * The requested delivery system isn't supported. Maybe userspace
1707          * is requesting a DVBv3 compatible delivery system.
1708          *
1709          * The emulation only works if the desired system is one of the
1710          * delivery systems supported by DVBv3 API
1711          */
1712         if (!is_dvbv3_delsys(desired_system)) {
1713                 dev_dbg(fe->dvb->device,
1714                         "%s: Delivery system %d not supported.\n",
1715                         __func__, desired_system);
1716                 return -EINVAL;
1717         }
1718
1719         type = dvbv3_type(desired_system);
1720
1721         /*
1722         * Get the last non-DVBv3 delivery system that has the same type
1723         * of the desired system
1724         */
1725         ncaps = 0;
1726         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1727                 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1728                         delsys = fe->ops.delsys[ncaps];
1729                 ncaps++;
1730         }
1731
1732         /* There's nothing compatible with the desired delivery system */
1733         if (delsys == SYS_UNDEFINED) {
1734                 dev_dbg(fe->dvb->device,
1735                         "%s: Delivery system %d not supported on emulation mode.\n",
1736                         __func__, desired_system);
1737                 return -EINVAL;
1738         }
1739
1740         dev_dbg(fe->dvb->device,
1741                 "%s: Using delivery system %d emulated as if it were %d\n",
1742                 __func__, delsys, desired_system);
1743
1744         return emulate_delivery_system(fe, desired_system);
1745 }
1746
1747 /**
1748  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1749  * @fe: frontend struct
1750  *
1751  * A DVBv3 call doesn't know what's the desired system it wants. It also
1752  * doesn't allow to switch between different types. Due to that, userspace
1753  * should use DVBv5 instead.
1754  * However, in order to avoid breaking userspace API, limited backward
1755  * compatibility support is provided.
1756  *
1757  * There are some delivery systems that are incompatible with DVBv3 calls.
1758  *
1759  * This routine should work fine for frontends that support just one delivery
1760  * system.
1761  *
1762  * For frontends that support multiple frontends:
1763  * 1) It defaults to use the first supported delivery system. There's an
1764  *    userspace application that allows changing it at runtime;
1765  *
1766  * 2) If the current delivery system is not compatible with DVBv3, it gets
1767  *    the first one that it is compatible.
1768  *
1769  * NOTE: in order for this to work with applications like Kaffeine that
1770  *      uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1771  *      DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1772  *      SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1773  *      to DVB-S.
1774  */
1775 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1776 {
1777         int ncaps;
1778         u32 delsys = SYS_UNDEFINED;
1779         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1780
1781         /* If not set yet, defaults to the first supported delivery system */
1782         if (c->delivery_system == SYS_UNDEFINED)
1783                 c->delivery_system = fe->ops.delsys[0];
1784
1785         /*
1786          * Trivial case: just use the current one, if it already a DVBv3
1787          * delivery system
1788          */
1789         if (is_dvbv3_delsys(c->delivery_system)) {
1790                 dev_dbg(fe->dvb->device,
1791                                 "%s: Using delivery system to %d\n",
1792                                 __func__, c->delivery_system);
1793                 return 0;
1794         }
1795
1796         /*
1797          * Seek for the first delivery system that it is compatible with a
1798          * DVBv3 standard
1799          */
1800         ncaps = 0;
1801         while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1802                 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1803                         delsys = fe->ops.delsys[ncaps];
1804                         break;
1805                 }
1806                 ncaps++;
1807         }
1808         if (delsys == SYS_UNDEFINED) {
1809                 dev_dbg(fe->dvb->device,
1810                         "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1811                         __func__);
1812                 return -EINVAL;
1813         }
1814         return emulate_delivery_system(fe, delsys);
1815 }
1816
1817 static int dtv_property_process_set(struct dvb_frontend *fe,
1818                                     struct dtv_property *tvp,
1819                                     struct file *file)
1820 {
1821         int r = 0;
1822         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1823
1824         /* Allow the frontend to validate incoming properties */
1825         if (fe->ops.set_property) {
1826                 r = fe->ops.set_property(fe, tvp);
1827                 if (r < 0)
1828                         return r;
1829         }
1830
1831         switch(tvp->cmd) {
1832         case DTV_CLEAR:
1833                 /*
1834                  * Reset a cache of data specific to the frontend here. This does
1835                  * not effect hardware.
1836                  */
1837                 dvb_frontend_clear_cache(fe);
1838                 break;
1839         case DTV_TUNE:
1840                 /* interpret the cache of data, build either a traditional frontend
1841                  * tunerequest so we can pass validation in the FE_SET_FRONTEND
1842                  * ioctl.
1843                  */
1844                 c->state = tvp->cmd;
1845                 dev_dbg(fe->dvb->device, "%s: Finalised property cache\n",
1846                                 __func__);
1847
1848                 r = dtv_set_frontend(fe);
1849                 break;
1850         case DTV_FREQUENCY:
1851                 c->frequency = tvp->u.data;
1852                 break;
1853         case DTV_MODULATION:
1854                 c->modulation = tvp->u.data;
1855                 break;
1856         case DTV_BANDWIDTH_HZ:
1857                 c->bandwidth_hz = tvp->u.data;
1858                 break;
1859         case DTV_INVERSION:
1860                 c->inversion = tvp->u.data;
1861                 break;
1862         case DTV_SYMBOL_RATE:
1863                 c->symbol_rate = tvp->u.data;
1864                 break;
1865         case DTV_INNER_FEC:
1866                 c->fec_inner = tvp->u.data;
1867                 break;
1868         case DTV_PILOT:
1869                 c->pilot = tvp->u.data;
1870                 break;
1871         case DTV_ROLLOFF:
1872                 c->rolloff = tvp->u.data;
1873                 break;
1874         case DTV_DELIVERY_SYSTEM:
1875                 r = dvbv5_set_delivery_system(fe, tvp->u.data);
1876                 break;
1877         case DTV_VOLTAGE:
1878                 c->voltage = tvp->u.data;
1879                 r = dvb_frontend_ioctl_legacy(file, FE_SET_VOLTAGE,
1880                         (void *)c->voltage);
1881                 break;
1882         case DTV_TONE:
1883                 c->sectone = tvp->u.data;
1884                 r = dvb_frontend_ioctl_legacy(file, FE_SET_TONE,
1885                         (void *)c->sectone);
1886                 break;
1887         case DTV_CODE_RATE_HP:
1888                 c->code_rate_HP = tvp->u.data;
1889                 break;
1890         case DTV_CODE_RATE_LP:
1891                 c->code_rate_LP = tvp->u.data;
1892                 break;
1893         case DTV_GUARD_INTERVAL:
1894                 c->guard_interval = tvp->u.data;
1895                 break;
1896         case DTV_TRANSMISSION_MODE:
1897                 c->transmission_mode = tvp->u.data;
1898                 break;
1899         case DTV_HIERARCHY:
1900                 c->hierarchy = tvp->u.data;
1901                 break;
1902         case DTV_INTERLEAVING:
1903                 c->interleaving = tvp->u.data;
1904                 break;
1905
1906         /* ISDB-T Support here */
1907         case DTV_ISDBT_PARTIAL_RECEPTION:
1908                 c->isdbt_partial_reception = tvp->u.data;
1909                 break;
1910         case DTV_ISDBT_SOUND_BROADCASTING:
1911                 c->isdbt_sb_mode = tvp->u.data;
1912                 break;
1913         case DTV_ISDBT_SB_SUBCHANNEL_ID:
1914                 c->isdbt_sb_subchannel = tvp->u.data;
1915                 break;
1916         case DTV_ISDBT_SB_SEGMENT_IDX:
1917                 c->isdbt_sb_segment_idx = tvp->u.data;
1918                 break;
1919         case DTV_ISDBT_SB_SEGMENT_COUNT:
1920                 c->isdbt_sb_segment_count = tvp->u.data;
1921                 break;
1922         case DTV_ISDBT_LAYER_ENABLED:
1923                 c->isdbt_layer_enabled = tvp->u.data;
1924                 break;
1925         case DTV_ISDBT_LAYERA_FEC:
1926                 c->layer[0].fec = tvp->u.data;
1927                 break;
1928         case DTV_ISDBT_LAYERA_MODULATION:
1929                 c->layer[0].modulation = tvp->u.data;
1930                 break;
1931         case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1932                 c->layer[0].segment_count = tvp->u.data;
1933                 break;
1934         case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1935                 c->layer[0].interleaving = tvp->u.data;
1936                 break;
1937         case DTV_ISDBT_LAYERB_FEC:
1938                 c->layer[1].fec = tvp->u.data;
1939                 break;
1940         case DTV_ISDBT_LAYERB_MODULATION:
1941                 c->layer[1].modulation = tvp->u.data;
1942                 break;
1943         case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1944                 c->layer[1].segment_count = tvp->u.data;
1945                 break;
1946         case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1947                 c->layer[1].interleaving = tvp->u.data;
1948                 break;
1949         case DTV_ISDBT_LAYERC_FEC:
1950                 c->layer[2].fec = tvp->u.data;
1951                 break;
1952         case DTV_ISDBT_LAYERC_MODULATION:
1953                 c->layer[2].modulation = tvp->u.data;
1954                 break;
1955         case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1956                 c->layer[2].segment_count = tvp->u.data;
1957                 break;
1958         case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1959                 c->layer[2].interleaving = tvp->u.data;
1960                 break;
1961
1962         /* Multistream support */
1963         case DTV_STREAM_ID:
1964         case DTV_DVBT2_PLP_ID_LEGACY:
1965                 c->stream_id = tvp->u.data;
1966                 break;
1967
1968         /* ATSC-MH */
1969         case DTV_ATSCMH_PARADE_ID:
1970                 fe->dtv_property_cache.atscmh_parade_id = tvp->u.data;
1971                 break;
1972         case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1973                 fe->dtv_property_cache.atscmh_rs_frame_ensemble = tvp->u.data;
1974                 break;
1975
1976         case DTV_LNA:
1977                 c->lna = tvp->u.data;
1978                 if (fe->ops.set_lna)
1979                         r = fe->ops.set_lna(fe);
1980                 if (r < 0)
1981                         c->lna = LNA_AUTO;
1982                 break;
1983
1984         default:
1985                 return -EINVAL;
1986         }
1987
1988         return r;
1989 }
1990
1991 static int dvb_frontend_ioctl(struct file *file,
1992                         unsigned int cmd, void *parg)
1993 {
1994         struct dvb_device *dvbdev = file->private_data;
1995         struct dvb_frontend *fe = dvbdev->priv;
1996         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1997         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1998         int err = -EOPNOTSUPP;
1999
2000         dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2001         if (down_interruptible(&fepriv->sem))
2002                 return -ERESTARTSYS;
2003
2004         if (fe->exit != DVB_FE_NO_EXIT) {
2005                 up(&fepriv->sem);
2006                 return -ENODEV;
2007         }
2008
2009         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
2010             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
2011              cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2012                 up(&fepriv->sem);
2013                 return -EPERM;
2014         }
2015
2016         if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
2017                 err = dvb_frontend_ioctl_properties(file, cmd, parg);
2018         else {
2019                 c->state = DTV_UNDEFINED;
2020                 err = dvb_frontend_ioctl_legacy(file, cmd, parg);
2021         }
2022
2023         up(&fepriv->sem);
2024         return err;
2025 }
2026
2027 static int dvb_frontend_ioctl_properties(struct file *file,
2028                         unsigned int cmd, void *parg)
2029 {
2030         struct dvb_device *dvbdev = file->private_data;
2031         struct dvb_frontend *fe = dvbdev->priv;
2032         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2033         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2034         int err = 0;
2035
2036         struct dtv_properties *tvps = parg;
2037         struct dtv_property *tvp = NULL;
2038         int i;
2039
2040         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2041
2042         if (cmd == FE_SET_PROPERTY) {
2043                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2044                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2045
2046                 /* Put an arbitrary limit on the number of messages that can
2047                  * be sent at once */
2048                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2049                         return -EINVAL;
2050
2051                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
2052                 if (!tvp) {
2053                         err = -ENOMEM;
2054                         goto out;
2055                 }
2056
2057                 if (copy_from_user(tvp, (void __user *)tvps->props,
2058                                    tvps->num * sizeof(struct dtv_property))) {
2059                         err = -EFAULT;
2060                         goto out;
2061                 }
2062
2063                 for (i = 0; i < tvps->num; i++) {
2064                         err = dtv_property_process_set(fe, tvp + i, file);
2065                         if (err < 0)
2066                                 goto out;
2067                         (tvp + i)->result = err;
2068                 }
2069
2070                 if (c->state == DTV_TUNE)
2071                         dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
2072
2073         } else if (cmd == FE_GET_PROPERTY) {
2074                 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", __func__, tvps->num);
2075                 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", __func__, tvps->props);
2076
2077                 /* Put an arbitrary limit on the number of messages that can
2078                  * be sent at once */
2079                 if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
2080                         return -EINVAL;
2081
2082                 tvp = kmalloc(tvps->num * sizeof(struct dtv_property), GFP_KERNEL);
2083                 if (!tvp) {
2084                         err = -ENOMEM;
2085                         goto out;
2086                 }
2087
2088                 if (copy_from_user(tvp, (void __user *)tvps->props,
2089                                    tvps->num * sizeof(struct dtv_property))) {
2090                         err = -EFAULT;
2091                         goto out;
2092                 }
2093
2094                 /*
2095                  * Fills the cache out struct with the cache contents, plus
2096                  * the data retrieved from get_frontend, if the frontend
2097                  * is not idle. Otherwise, returns the cached content
2098                  */
2099                 if (fepriv->state != FESTATE_IDLE) {
2100                         err = dtv_get_frontend(fe, NULL);
2101                         if (err < 0)
2102                                 goto out;
2103                 }
2104                 for (i = 0; i < tvps->num; i++) {
2105                         err = dtv_property_process_get(fe, c, tvp + i, file);
2106                         if (err < 0)
2107                                 goto out;
2108                         (tvp + i)->result = err;
2109                 }
2110
2111                 if (copy_to_user((void __user *)tvps->props, tvp,
2112                                  tvps->num * sizeof(struct dtv_property))) {
2113                         err = -EFAULT;
2114                         goto out;
2115                 }
2116
2117         } else
2118                 err = -EOPNOTSUPP;
2119
2120 out:
2121         kfree(tvp);
2122         return err;
2123 }
2124
2125 static int dtv_set_frontend(struct dvb_frontend *fe)
2126 {
2127         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2128         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2129         struct dvb_frontend_tune_settings fetunesettings;
2130         u32 rolloff = 0;
2131
2132         if (dvb_frontend_check_parameters(fe) < 0)
2133                 return -EINVAL;
2134
2135         /*
2136          * Initialize output parameters to match the values given by
2137          * the user. FE_SET_FRONTEND triggers an initial frontend event
2138          * with status = 0, which copies output parameters to userspace.
2139          */
2140         dtv_property_legacy_params_sync(fe, &fepriv->parameters_out);
2141
2142         /*
2143          * Be sure that the bandwidth will be filled for all
2144          * non-satellite systems, as tuners need to know what
2145          * low pass/Nyquist half filter should be applied, in
2146          * order to avoid inter-channel noise.
2147          *
2148          * ISDB-T and DVB-T/T2 already sets bandwidth.
2149          * ATSC and DVB-C don't set, so, the core should fill it.
2150          *
2151          * On DVB-C Annex A and C, the bandwidth is a function of
2152          * the roll-off and symbol rate. Annex B defines different
2153          * roll-off factors depending on the modulation. Fortunately,
2154          * Annex B is only used with 6MHz, so there's no need to
2155          * calculate it.
2156          *
2157          * While not officially supported, a side effect of handling it at
2158          * the cache level is that a program could retrieve the bandwidth
2159          * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2160          */
2161         switch (c->delivery_system) {
2162         case SYS_ATSC:
2163         case SYS_DVBC_ANNEX_B:
2164                 c->bandwidth_hz = 6000000;
2165                 break;
2166         case SYS_DVBC_ANNEX_A:
2167                 rolloff = 115;
2168                 break;
2169         case SYS_DVBC_ANNEX_C:
2170                 rolloff = 113;
2171                 break;
2172         case SYS_DVBS:
2173         case SYS_TURBO:
2174         case SYS_ISDBS:
2175                 rolloff = 135;
2176                 break;
2177         case SYS_DVBS2:
2178                 switch (c->rolloff) {
2179                 case ROLLOFF_20:
2180                         rolloff = 120;
2181                         break;
2182                 case ROLLOFF_25:
2183                         rolloff = 125;
2184                         break;
2185                 default:
2186                 case ROLLOFF_35:
2187                         rolloff = 135;
2188                 }
2189                 break;
2190         default:
2191                 break;
2192         }
2193         if (rolloff)
2194                 c->bandwidth_hz = (c->symbol_rate * rolloff) / 100;
2195
2196         /* force auto frequency inversion if requested */
2197         if (dvb_force_auto_inversion)
2198                 c->inversion = INVERSION_AUTO;
2199
2200         /*
2201          * without hierarchical coding code_rate_LP is irrelevant,
2202          * so we tolerate the otherwise invalid FEC_NONE setting
2203          */
2204         if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2205                 c->code_rate_LP = FEC_AUTO;
2206
2207         /* get frontend-specific tuning settings */
2208         memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2209         if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2210                 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2211                 fepriv->max_drift = fetunesettings.max_drift;
2212                 fepriv->step_size = fetunesettings.step_size;
2213         } else {
2214                 /* default values */
2215                 switch (c->delivery_system) {
2216                 case SYS_DVBS:
2217                 case SYS_DVBS2:
2218                 case SYS_ISDBS:
2219                 case SYS_TURBO:
2220                 case SYS_DVBC_ANNEX_A:
2221                 case SYS_DVBC_ANNEX_C:
2222                         fepriv->min_delay = HZ / 20;
2223                         fepriv->step_size = c->symbol_rate / 16000;
2224                         fepriv->max_drift = c->symbol_rate / 2000;
2225                         break;
2226                 case SYS_DVBT:
2227                 case SYS_DVBT2:
2228                 case SYS_ISDBT:
2229                 case SYS_DTMB:
2230                         fepriv->min_delay = HZ / 20;
2231                         fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
2232                         fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
2233                         break;
2234                 default:
2235                         /*
2236                          * FIXME: This sounds wrong! if freqency_stepsize is
2237                          * defined by the frontend, why not use it???
2238                          */
2239                         fepriv->min_delay = HZ / 20;
2240                         fepriv->step_size = 0; /* no zigzag */
2241                         fepriv->max_drift = 0;
2242                         break;
2243                 }
2244         }
2245         if (dvb_override_tune_delay > 0)
2246                 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2247
2248         fepriv->state = FESTATE_RETUNE;
2249
2250         /* Request the search algorithm to search */
2251         fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2252
2253         dvb_frontend_clear_events(fe);
2254         dvb_frontend_add_event(fe, 0);
2255         dvb_frontend_wakeup(fe);
2256         fepriv->status = 0;
2257
2258         return 0;
2259 }
2260
2261
2262 static int dvb_frontend_ioctl_legacy(struct file *file,
2263                         unsigned int cmd, void *parg)
2264 {
2265         struct dvb_device *dvbdev = file->private_data;
2266         struct dvb_frontend *fe = dvbdev->priv;
2267         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2268         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2269         int err = -EOPNOTSUPP;
2270
2271         switch (cmd) {
2272         case FE_GET_INFO: {
2273                 struct dvb_frontend_info* info = parg;
2274
2275                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
2276                 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, &info->frequency_max);
2277
2278                 /*
2279                  * Associate the 4 delivery systems supported by DVBv3
2280                  * API with their DVBv5 counterpart. For the other standards,
2281                  * use the closest type, assuming that it would hopefully
2282                  * work with a DVBv3 application.
2283                  * It should be noticed that, on multi-frontend devices with
2284                  * different types (terrestrial and cable, for example),
2285                  * a pure DVBv3 application won't be able to use all delivery
2286                  * systems. Yet, changing the DVBv5 cache to the other delivery
2287                  * system should be enough for making it work.
2288                  */
2289                 switch (dvbv3_type(c->delivery_system)) {
2290                 case DVBV3_QPSK:
2291                         info->type = FE_QPSK;
2292                         break;
2293                 case DVBV3_ATSC:
2294                         info->type = FE_ATSC;
2295                         break;
2296                 case DVBV3_QAM:
2297                         info->type = FE_QAM;
2298                         break;
2299                 case DVBV3_OFDM:
2300                         info->type = FE_OFDM;
2301                         break;
2302                 default:
2303                         dev_err(fe->dvb->device,
2304                                         "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2305                                         __func__, c->delivery_system);
2306                         fe->ops.info.type = FE_OFDM;
2307                 }
2308                 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2309                                  __func__, c->delivery_system, fe->ops.info.type);
2310
2311                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
2312                  * do it, it is done for it. */
2313                 info->caps |= FE_CAN_INVERSION_AUTO;
2314                 err = 0;
2315                 break;
2316         }
2317
2318         case FE_READ_STATUS: {
2319                 fe_status_t* status = parg;
2320
2321                 /* if retune was requested but hasn't occurred yet, prevent
2322                  * that user get signal state from previous tuning */
2323                 if (fepriv->state == FESTATE_RETUNE ||
2324                     fepriv->state == FESTATE_ERROR) {
2325                         err=0;
2326                         *status = 0;
2327                         break;
2328                 }
2329
2330                 if (fe->ops.read_status)
2331                         err = fe->ops.read_status(fe, status);
2332                 break;
2333         }
2334
2335         case FE_READ_BER:
2336                 if (fe->ops.read_ber) {
2337                         if (fepriv->thread)
2338                                 err = fe->ops.read_ber(fe, (__u32 *) parg);
2339                         else
2340                                 err = -EAGAIN;
2341                 }
2342                 break;
2343
2344         case FE_READ_SIGNAL_STRENGTH:
2345                 if (fe->ops.read_signal_strength) {
2346                         if (fepriv->thread)
2347                                 err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
2348                         else
2349                                 err = -EAGAIN;
2350                 }
2351                 break;
2352
2353         case FE_READ_SNR:
2354                 if (fe->ops.read_snr) {
2355                         if (fepriv->thread)
2356                                 err = fe->ops.read_snr(fe, (__u16 *) parg);
2357                         else
2358                                 err = -EAGAIN;
2359                 }
2360                 break;
2361
2362         case FE_READ_UNCORRECTED_BLOCKS:
2363                 if (fe->ops.read_ucblocks) {
2364                         if (fepriv->thread)
2365                                 err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
2366                         else
2367                                 err = -EAGAIN;
2368                 }
2369                 break;
2370
2371         case FE_DISEQC_RESET_OVERLOAD:
2372                 if (fe->ops.diseqc_reset_overload) {
2373                         err = fe->ops.diseqc_reset_overload(fe);
2374                         fepriv->state = FESTATE_DISEQC;
2375                         fepriv->status = 0;
2376                 }
2377                 break;
2378
2379         case FE_DISEQC_SEND_MASTER_CMD:
2380                 if (fe->ops.diseqc_send_master_cmd) {
2381                         err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
2382                         fepriv->state = FESTATE_DISEQC;
2383                         fepriv->status = 0;
2384                 }
2385                 break;
2386
2387         case FE_DISEQC_SEND_BURST:
2388                 if (fe->ops.diseqc_send_burst) {
2389                         err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
2390                         fepriv->state = FESTATE_DISEQC;
2391                         fepriv->status = 0;
2392                 }
2393                 break;
2394
2395         case FE_SET_TONE:
2396                 if (fe->ops.set_tone) {
2397                         err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
2398                         fepriv->tone = (fe_sec_tone_mode_t) parg;
2399                         fepriv->state = FESTATE_DISEQC;
2400                         fepriv->status = 0;
2401                 }
2402                 break;
2403
2404         case FE_SET_VOLTAGE:
2405                 if (fe->ops.set_voltage) {
2406                         err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
2407                         fepriv->voltage = (fe_sec_voltage_t) parg;
2408                         fepriv->state = FESTATE_DISEQC;
2409                         fepriv->status = 0;
2410                 }
2411                 break;
2412
2413         case FE_DISHNETWORK_SEND_LEGACY_CMD:
2414                 if (fe->ops.dishnetwork_send_legacy_command) {
2415                         err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
2416                         fepriv->state = FESTATE_DISEQC;
2417                         fepriv->status = 0;
2418                 } else if (fe->ops.set_voltage) {
2419                         /*
2420                          * NOTE: This is a fallback condition.  Some frontends
2421                          * (stv0299 for instance) take longer than 8msec to
2422                          * respond to a set_voltage command.  Those switches
2423                          * need custom routines to switch properly.  For all
2424                          * other frontends, the following should work ok.
2425                          * Dish network legacy switches (as used by Dish500)
2426                          * are controlled by sending 9-bit command words
2427                          * spaced 8msec apart.
2428                          * the actual command word is switch/port dependent
2429                          * so it is up to the userspace application to send
2430                          * the right command.
2431                          * The command must always start with a '0' after
2432                          * initialization, so parg is 8 bits and does not
2433                          * include the initialization or start bit
2434                          */
2435                         unsigned long swcmd = ((unsigned long) parg) << 1;
2436                         struct timeval nexttime;
2437                         struct timeval tv[10];
2438                         int i;
2439                         u8 last = 1;
2440                         if (dvb_frontend_debug)
2441                                 printk("%s switch command: 0x%04lx\n", __func__, swcmd);
2442                         do_gettimeofday(&nexttime);
2443                         if (dvb_frontend_debug)
2444                                 tv[0] = nexttime;
2445                         /* before sending a command, initialize by sending
2446                          * a 32ms 18V to the switch
2447                          */
2448                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2449                         dvb_frontend_sleep_until(&nexttime, 32000);
2450
2451                         for (i = 0; i < 9; i++) {
2452                                 if (dvb_frontend_debug)
2453                                         do_gettimeofday(&tv[i + 1]);
2454                                 if ((swcmd & 0x01) != last) {
2455                                         /* set voltage to (last ? 13V : 18V) */
2456                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2457                                         last = (last) ? 0 : 1;
2458                                 }
2459                                 swcmd = swcmd >> 1;
2460                                 if (i != 8)
2461                                         dvb_frontend_sleep_until(&nexttime, 8000);
2462                         }
2463                         if (dvb_frontend_debug) {
2464                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
2465                                         __func__, fe->dvb->num);
2466                                 for (i = 1; i < 10; i++)
2467                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
2468                         }
2469                         err = 0;
2470                         fepriv->state = FESTATE_DISEQC;
2471                         fepriv->status = 0;
2472                 }
2473                 break;
2474
2475         case FE_DISEQC_RECV_SLAVE_REPLY:
2476                 if (fe->ops.diseqc_recv_slave_reply)
2477                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
2478                 break;
2479
2480         case FE_ENABLE_HIGH_LNB_VOLTAGE:
2481                 if (fe->ops.enable_high_lnb_voltage)
2482                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
2483                 break;
2484
2485         case FE_SET_FRONTEND:
2486                 err = dvbv3_set_delivery_system(fe);
2487                 if (err)
2488                         break;
2489
2490                 err = dtv_property_cache_sync(fe, c, parg);
2491                 if (err)
2492                         break;
2493                 err = dtv_set_frontend(fe);
2494                 break;
2495         case FE_GET_EVENT:
2496                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
2497                 break;
2498
2499         case FE_GET_FRONTEND:
2500                 err = dtv_get_frontend(fe, parg);
2501                 break;
2502
2503         case FE_SET_FRONTEND_TUNE_MODE:
2504                 fepriv->tune_mode_flags = (unsigned long) parg;
2505                 err = 0;
2506                 break;
2507         }
2508
2509         return err;
2510 }
2511
2512
2513 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2514 {
2515         struct dvb_device *dvbdev = file->private_data;
2516         struct dvb_frontend *fe = dvbdev->priv;
2517         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2518
2519         dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2520
2521         poll_wait (file, &fepriv->events.wait_queue, wait);
2522
2523         if (fepriv->events.eventw != fepriv->events.eventr)
2524                 return (POLLIN | POLLRDNORM | POLLPRI);
2525
2526         return 0;
2527 }
2528
2529 static int dvb_frontend_open(struct inode *inode, struct file *file)
2530 {
2531         struct dvb_device *dvbdev = file->private_data;
2532         struct dvb_frontend *fe = dvbdev->priv;
2533         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2534         struct dvb_adapter *adapter = fe->dvb;
2535         int ret;
2536
2537         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2538         if (fe->exit == DVB_FE_DEVICE_REMOVED)
2539                 return -ENODEV;
2540
2541         if (adapter->mfe_shared) {
2542                 mutex_lock (&adapter->mfe_lock);
2543
2544                 if (adapter->mfe_dvbdev == NULL)
2545                         adapter->mfe_dvbdev = dvbdev;
2546
2547                 else if (adapter->mfe_dvbdev != dvbdev) {
2548                         struct dvb_device
2549                                 *mfedev = adapter->mfe_dvbdev;
2550                         struct dvb_frontend
2551                                 *mfe = mfedev->priv;
2552                         struct dvb_frontend_private
2553                                 *mfepriv = mfe->frontend_priv;
2554                         int mferetry = (dvb_mfe_wait_time << 1);
2555
2556                         mutex_unlock (&adapter->mfe_lock);
2557                         while (mferetry-- && (mfedev->users != -1 ||
2558                                         mfepriv->thread != NULL)) {
2559                                 if(msleep_interruptible(500)) {
2560                                         if(signal_pending(current))
2561                                                 return -EINTR;
2562                                 }
2563                         }
2564
2565                         mutex_lock (&adapter->mfe_lock);
2566                         if(adapter->mfe_dvbdev != dvbdev) {
2567                                 mfedev = adapter->mfe_dvbdev;
2568                                 mfe = mfedev->priv;
2569                                 mfepriv = mfe->frontend_priv;
2570                                 if (mfedev->users != -1 ||
2571                                                 mfepriv->thread != NULL) {
2572                                         mutex_unlock (&adapter->mfe_lock);
2573                                         return -EBUSY;
2574                                 }
2575                                 adapter->mfe_dvbdev = dvbdev;
2576                         }
2577                 }
2578         }
2579
2580         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2581                 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2582                         goto err0;
2583
2584                 /* If we took control of the bus, we need to force
2585                    reinitialization.  This is because many ts_bus_ctrl()
2586                    functions strobe the RESET pin on the demod, and if the
2587                    frontend thread already exists then the dvb_init() routine
2588                    won't get called (which is what usually does initial
2589                    register configuration). */
2590                 fepriv->reinitialise = 1;
2591         }
2592
2593         if ((ret = dvb_generic_open (inode, file)) < 0)
2594                 goto err1;
2595
2596         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2597                 /* normal tune mode when opened R/W */
2598                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2599                 fepriv->tone = -1;
2600                 fepriv->voltage = -1;
2601
2602                 ret = dvb_frontend_start (fe);
2603                 if (ret)
2604                         goto err2;
2605
2606                 /*  empty event queue */
2607                 fepriv->events.eventr = fepriv->events.eventw = 0;
2608         }
2609
2610         if (adapter->mfe_shared)
2611                 mutex_unlock (&adapter->mfe_lock);
2612         return ret;
2613
2614 err2:
2615         dvb_generic_release(inode, file);
2616 err1:
2617         if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2618                 fe->ops.ts_bus_ctrl(fe, 0);
2619 err0:
2620         if (adapter->mfe_shared)
2621                 mutex_unlock (&adapter->mfe_lock);
2622         return ret;
2623 }
2624
2625 static int dvb_frontend_release(struct inode *inode, struct file *file)
2626 {
2627         struct dvb_device *dvbdev = file->private_data;
2628         struct dvb_frontend *fe = dvbdev->priv;
2629         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2630         int ret;
2631
2632         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2633
2634         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2635                 fepriv->release_jiffies = jiffies;
2636                 mb();
2637         }
2638
2639         ret = dvb_generic_release (inode, file);
2640
2641         if (dvbdev->users == -1) {
2642                 wake_up(&fepriv->wait_queue);
2643                 if (fe->exit != DVB_FE_NO_EXIT)
2644                         wake_up(&dvbdev->wait_queue);
2645                 if (fe->ops.ts_bus_ctrl)
2646                         fe->ops.ts_bus_ctrl(fe, 0);
2647         }
2648
2649         return ret;
2650 }
2651
2652 static const struct file_operations dvb_frontend_fops = {
2653         .owner          = THIS_MODULE,
2654         .unlocked_ioctl = dvb_generic_ioctl,
2655         .poll           = dvb_frontend_poll,
2656         .open           = dvb_frontend_open,
2657         .release        = dvb_frontend_release,
2658         .llseek         = noop_llseek,
2659 };
2660
2661 int dvb_frontend_suspend(struct dvb_frontend *fe)
2662 {
2663         int ret = 0;
2664
2665         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2666                         fe->id);
2667
2668         if (fe->ops.tuner_ops.suspend)
2669                 ret = fe->ops.tuner_ops.suspend(fe);
2670         else if (fe->ops.tuner_ops.sleep)
2671                 ret = fe->ops.tuner_ops.sleep(fe);
2672
2673         if (fe->ops.sleep)
2674                 ret = fe->ops.sleep(fe);
2675
2676         return ret;
2677 }
2678 EXPORT_SYMBOL(dvb_frontend_suspend);
2679
2680 int dvb_frontend_resume(struct dvb_frontend *fe)
2681 {
2682         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2683         int ret = 0;
2684
2685         dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2686                         fe->id);
2687
2688         fe->exit = DVB_FE_DEVICE_RESUME;
2689         if (fe->ops.init)
2690                 ret = fe->ops.init(fe);
2691
2692         if (fe->ops.tuner_ops.resume)
2693                 ret = fe->ops.tuner_ops.resume(fe);
2694         else if (fe->ops.tuner_ops.init)
2695                 ret = fe->ops.tuner_ops.init(fe);
2696
2697         fe->exit = DVB_FE_NO_EXIT;
2698         fepriv->state = FESTATE_RETUNE;
2699         dvb_frontend_wakeup(fe);
2700
2701         return ret;
2702 }
2703 EXPORT_SYMBOL(dvb_frontend_resume);
2704
2705 int dvb_register_frontend(struct dvb_adapter* dvb,
2706                           struct dvb_frontend* fe)
2707 {
2708         struct dvb_frontend_private *fepriv;
2709         const struct dvb_device dvbdev_template = {
2710                 .users = ~0,
2711                 .writers = 1,
2712                 .readers = (~0)-1,
2713                 .fops = &dvb_frontend_fops,
2714 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2715                 .name = fe->ops.info.name,
2716 #endif
2717                 .kernel_ioctl = dvb_frontend_ioctl
2718         };
2719
2720         dev_dbg(dvb->device, "%s:\n", __func__);
2721
2722         if (mutex_lock_interruptible(&frontend_mutex))
2723                 return -ERESTARTSYS;
2724
2725         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2726         if (fe->frontend_priv == NULL) {
2727                 mutex_unlock(&frontend_mutex);
2728                 return -ENOMEM;
2729         }
2730         fepriv = fe->frontend_priv;
2731
2732         sema_init(&fepriv->sem, 1);
2733         init_waitqueue_head (&fepriv->wait_queue);
2734         init_waitqueue_head (&fepriv->events.wait_queue);
2735         mutex_init(&fepriv->events.mtx);
2736         fe->dvb = dvb;
2737         fepriv->inversion = INVERSION_OFF;
2738
2739         dev_info(fe->dvb->device,
2740                         "DVB: registering adapter %i frontend %i (%s)...\n",
2741                         fe->dvb->num, fe->id, fe->ops.info.name);
2742
2743         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2744                              fe, DVB_DEVICE_FRONTEND);
2745
2746         /*
2747          * Initialize the cache to the proper values according with the
2748          * first supported delivery system (ops->delsys[0])
2749          */
2750
2751         fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
2752         dvb_frontend_clear_cache(fe);
2753
2754         mutex_unlock(&frontend_mutex);
2755         return 0;
2756 }
2757 EXPORT_SYMBOL(dvb_register_frontend);
2758
2759 int dvb_unregister_frontend(struct dvb_frontend* fe)
2760 {
2761         struct dvb_frontend_private *fepriv = fe->frontend_priv;
2762         dev_dbg(fe->dvb->device, "%s:\n", __func__);
2763
2764         mutex_lock(&frontend_mutex);
2765         dvb_frontend_stop (fe);
2766         mutex_unlock(&frontend_mutex);
2767
2768         if (fepriv->dvbdev->users < -1)
2769                 wait_event(fepriv->dvbdev->wait_queue,
2770                                 fepriv->dvbdev->users==-1);
2771
2772         mutex_lock(&frontend_mutex);
2773         dvb_unregister_device (fepriv->dvbdev);
2774
2775         /* fe is invalid now */
2776         kfree(fepriv);
2777         mutex_unlock(&frontend_mutex);
2778         return 0;
2779 }
2780 EXPORT_SYMBOL(dvb_unregister_frontend);
2781
2782 #ifdef CONFIG_MEDIA_ATTACH
2783 void dvb_frontend_detach(struct dvb_frontend* fe)
2784 {
2785         void *ptr;
2786
2787         if (fe->ops.release_sec) {
2788                 fe->ops.release_sec(fe);
2789                 dvb_detach(fe->ops.release_sec);
2790         }
2791         if (fe->ops.tuner_ops.release) {
2792                 fe->ops.tuner_ops.release(fe);
2793                 dvb_detach(fe->ops.tuner_ops.release);
2794         }
2795         if (fe->ops.analog_ops.release) {
2796                 fe->ops.analog_ops.release(fe);
2797                 dvb_detach(fe->ops.analog_ops.release);
2798         }
2799         ptr = (void*)fe->ops.release;
2800         if (ptr) {
2801                 fe->ops.release(fe);
2802                 dvb_detach(ptr);
2803         }
2804 }
2805 #else
2806 void dvb_frontend_detach(struct dvb_frontend* fe)
2807 {
2808         if (fe->ops.release_sec)
2809                 fe->ops.release_sec(fe);
2810         if (fe->ops.tuner_ops.release)
2811                 fe->ops.tuner_ops.release(fe);
2812         if (fe->ops.analog_ops.release)
2813                 fe->ops.analog_ops.release(fe);
2814         if (fe->ops.release)
2815                 fe->ops.release(fe);
2816 }
2817 #endif
2818 EXPORT_SYMBOL(dvb_frontend_detach);