1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * dvb_frontend.c: DVB frontend tuning interface/thread 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 13/* Enables DVBv3 compatibility bits at the headers */ 14#define __DVB_CORE__ 15 16#define pr_fmt(fmt) "dvb_frontend: " fmt 17 18#include <linux/string.h> 19#include <linux/kernel.h> 20#include <linux/sched/signal.h> 21#include <linux/wait.h> 22#include <linux/slab.h> 23#include <linux/poll.h> 24#include <linux/semaphore.h> 25#include <linux/module.h> 26#include <linux/nospec.h> 27#include <linux/list.h> 28#include <linux/freezer.h> 29#include <linux/jiffies.h> 30#include <linux/kthread.h> 31#include <linux/ktime.h> 32#include <linux/compat.h> 33#include <asm/processor.h> 34 35#include <media/dvb_frontend.h> 36#include <media/dvbdev.h> 37#include <linux/dvb/version.h> 38 39static int dvb_frontend_debug; 40static int dvb_shutdown_timeout; 41static int dvb_force_auto_inversion; 42static int dvb_override_tune_delay; 43static int dvb_powerdown_on_sleep = 1; 44static int dvb_mfe_wait_time = 5; 45 46module_param_named(frontend_debug, dvb_frontend_debug, int, 0644); 47MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off)."); 48module_param(dvb_shutdown_timeout, int, 0644); 49MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); 50module_param(dvb_force_auto_inversion, int, 0644); 51MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); 52module_param(dvb_override_tune_delay, int, 0644); 53MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt"); 54module_param(dvb_powerdown_on_sleep, int, 0644); 55MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)"); 56module_param(dvb_mfe_wait_time, int, 0644); 57MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)"); 58 59#define dprintk(fmt, arg...) \ 60 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg) 61 62#define FESTATE_IDLE 1 63#define FESTATE_RETUNE 2 64#define FESTATE_TUNING_FAST 4 65#define FESTATE_TUNING_SLOW 8 66#define FESTATE_TUNED 16 67#define FESTATE_ZIGZAG_FAST 32 68#define FESTATE_ZIGZAG_SLOW 64 69#define FESTATE_DISEQC 128 70#define FESTATE_ERROR 256 71#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC) 72#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST) 73#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW) 74#define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW) 75 76/* 77 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling. 78 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune. 79 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress. 80 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower. 81 * FESTATE_TUNED. The frontend has successfully locked on. 82 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it. 83 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower. 84 * FESTATE_DISEQC. A DISEQC command has just been issued. 85 * FESTATE_WAITFORLOCK. When we're waiting for a lock. 86 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan. 87 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan. 88 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again. 89 */ 90 91static DEFINE_MUTEX(frontend_mutex); 92 93struct dvb_frontend_private { 94 /* thread/frontend values */ 95 struct dvb_device *dvbdev; 96 struct dvb_frontend_parameters parameters_out; 97 struct dvb_fe_events events; 98 struct semaphore sem; 99 struct list_head list_head; 100 wait_queue_head_t wait_queue; 101 struct task_struct *thread; 102 unsigned long release_jiffies; 103 unsigned int wakeup; 104 enum fe_status status; 105 unsigned long tune_mode_flags; 106 unsigned int delay; 107 unsigned int reinitialise; 108 int tone; 109 int voltage; 110 111 /* swzigzag values */ 112 unsigned int state; 113 unsigned int bending; 114 int lnb_drift; 115 unsigned int inversion; 116 unsigned int auto_step; 117 unsigned int auto_sub_step; 118 unsigned int started_auto_step; 119 unsigned int min_delay; 120 unsigned int max_drift; 121 unsigned int step_size; 122 int quality; 123 unsigned int check_wrapped; 124 enum dvbfe_search algo_status; 125 126#if defined(CONFIG_MEDIA_CONTROLLER_DVB) 127 struct media_pipeline pipe; 128#endif 129}; 130 131static void dvb_frontend_invoke_release(struct dvb_frontend *fe, 132 void (*release)(struct dvb_frontend *fe)); 133 134static void __dvb_frontend_free(struct dvb_frontend *fe) 135{ 136 struct dvb_frontend_private *fepriv = fe->frontend_priv; 137 138 if (fepriv) 139 dvb_device_put(fepriv->dvbdev); 140 141 dvb_frontend_invoke_release(fe, fe->ops.release); 142 143 kfree(fepriv); 144} 145 146static void dvb_frontend_free(struct kref *ref) 147{ 148 struct dvb_frontend *fe = 149 container_of(ref, struct dvb_frontend, refcount); 150 151 __dvb_frontend_free(fe); 152} 153 154static void dvb_frontend_put(struct dvb_frontend *fe) 155{ 156 /* call detach before dropping the reference count */ 157 if (fe->ops.detach) 158 fe->ops.detach(fe); 159 /* 160 * Check if the frontend was registered, as otherwise 161 * kref was not initialized yet. 162 */ 163 if (fe->frontend_priv) 164 kref_put(&fe->refcount, dvb_frontend_free); 165 else 166 __dvb_frontend_free(fe); 167} 168 169static void dvb_frontend_get(struct dvb_frontend *fe) 170{ 171 kref_get(&fe->refcount); 172} 173 174static void dvb_frontend_wakeup(struct dvb_frontend *fe); 175static int dtv_get_frontend(struct dvb_frontend *fe, 176 struct dtv_frontend_properties *c, 177 struct dvb_frontend_parameters *p_out); 178static int 179dtv_property_legacy_params_sync(struct dvb_frontend *fe, 180 const struct dtv_frontend_properties *c, 181 struct dvb_frontend_parameters *p); 182 183static bool has_get_frontend(struct dvb_frontend *fe) 184{ 185 return fe->ops.get_frontend; 186} 187 188/* 189 * Due to DVBv3 API calls, a delivery system should be mapped into one of 190 * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC), 191 * otherwise, a DVBv3 call will fail. 192 */ 193enum dvbv3_emulation_type { 194 DVBV3_UNKNOWN, 195 DVBV3_QPSK, 196 DVBV3_QAM, 197 DVBV3_OFDM, 198 DVBV3_ATSC, 199}; 200 201static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system) 202{ 203 switch (delivery_system) { 204 case SYS_DVBC_ANNEX_A: 205 case SYS_DVBC_ANNEX_C: 206 return DVBV3_QAM; 207 case SYS_DVBS: 208 case SYS_DVBS2: 209 case SYS_TURBO: 210 case SYS_ISDBS: 211 case SYS_DSS: 212 return DVBV3_QPSK; 213 case SYS_DVBT: 214 case SYS_DVBT2: 215 case SYS_ISDBT: 216 case SYS_DTMB: 217 return DVBV3_OFDM; 218 case SYS_ATSC: 219 case SYS_ATSCMH: 220 case SYS_DVBC_ANNEX_B: 221 return DVBV3_ATSC; 222 case SYS_UNDEFINED: 223 case SYS_ISDBC: 224 case SYS_DVBH: 225 case SYS_DAB: 226 default: 227 /* 228 * Doesn't know how to emulate those types and/or 229 * there's no frontend driver from this type yet 230 * with some emulation code, so, we're not sure yet how 231 * to handle them, or they're not compatible with a DVBv3 call. 232 */ 233 return DVBV3_UNKNOWN; 234 } 235} 236 237static void dvb_frontend_add_event(struct dvb_frontend *fe, 238 enum fe_status status) 239{ 240 struct dvb_frontend_private *fepriv = fe->frontend_priv; 241 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 242 struct dvb_fe_events *events = &fepriv->events; 243 struct dvb_frontend_event *e; 244 int wp; 245 246 dev_dbg(fe->dvb->device, "%s:\n", __func__); 247 248 if ((status & FE_HAS_LOCK) && has_get_frontend(fe)) 249 dtv_get_frontend(fe, c, &fepriv->parameters_out); 250 251 mutex_lock(&events->mtx); 252 253 wp = (events->eventw + 1) % MAX_EVENT; 254 if (wp == events->eventr) { 255 events->overflow = 1; 256 events->eventr = (events->eventr + 1) % MAX_EVENT; 257 } 258 259 e = &events->events[events->eventw]; 260 e->status = status; 261 e->parameters = fepriv->parameters_out; 262 263 events->eventw = wp; 264 265 mutex_unlock(&events->mtx); 266 267 wake_up_interruptible(&events->wait_queue); 268} 269 270static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv, 271 struct dvb_fe_events *events) 272{ 273 int ret; 274 275 up(&fepriv->sem); 276 ret = events->eventw != events->eventr; 277 down(&fepriv->sem); 278 279 return ret; 280} 281 282static int dvb_frontend_get_event(struct dvb_frontend *fe, 283 struct dvb_frontend_event *event, int flags) 284{ 285 struct dvb_frontend_private *fepriv = fe->frontend_priv; 286 struct dvb_fe_events *events = &fepriv->events; 287 288 dev_dbg(fe->dvb->device, "%s:\n", __func__); 289 290 if (events->overflow) { 291 events->overflow = 0; 292 return -EOVERFLOW; 293 } 294 295 if (events->eventw == events->eventr) { 296 struct wait_queue_entry wait; 297 int ret = 0; 298 299 if (flags & O_NONBLOCK) 300 return -EWOULDBLOCK; 301 302 init_waitqueue_entry(&wait, current); 303 add_wait_queue(&events->wait_queue, &wait); 304 while (!dvb_frontend_test_event(fepriv, events)) { 305 wait_woken(&wait, TASK_INTERRUPTIBLE, 0); 306 if (signal_pending(current)) { 307 ret = -ERESTARTSYS; 308 break; 309 } 310 } 311 remove_wait_queue(&events->wait_queue, &wait); 312 if (ret < 0) 313 return ret; 314 } 315 316 mutex_lock(&events->mtx); 317 *event = events->events[events->eventr]; 318 events->eventr = (events->eventr + 1) % MAX_EVENT; 319 mutex_unlock(&events->mtx); 320 321 return 0; 322} 323 324static void dvb_frontend_clear_events(struct dvb_frontend *fe) 325{ 326 struct dvb_frontend_private *fepriv = fe->frontend_priv; 327 struct dvb_fe_events *events = &fepriv->events; 328 329 mutex_lock(&events->mtx); 330 events->eventr = events->eventw; 331 mutex_unlock(&events->mtx); 332} 333 334static void dvb_frontend_init(struct dvb_frontend *fe) 335{ 336 dev_dbg(fe->dvb->device, 337 "%s: initialising adapter %i frontend %i (%s)...\n", 338 __func__, fe->dvb->num, fe->id, fe->ops.info.name); 339 340 if (fe->ops.init) 341 fe->ops.init(fe); 342 if (fe->ops.tuner_ops.init) { 343 if (fe->ops.i2c_gate_ctrl) 344 fe->ops.i2c_gate_ctrl(fe, 1); 345 fe->ops.tuner_ops.init(fe); 346 if (fe->ops.i2c_gate_ctrl) 347 fe->ops.i2c_gate_ctrl(fe, 0); 348 } 349} 350 351void dvb_frontend_reinitialise(struct dvb_frontend *fe) 352{ 353 struct dvb_frontend_private *fepriv = fe->frontend_priv; 354 355 fepriv->reinitialise = 1; 356 dvb_frontend_wakeup(fe); 357} 358EXPORT_SYMBOL(dvb_frontend_reinitialise); 359 360static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked) 361{ 362 int q2; 363 struct dvb_frontend *fe = fepriv->dvbdev->priv; 364 365 dev_dbg(fe->dvb->device, "%s:\n", __func__); 366 367 if (locked) 368 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256; 369 else 370 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256; 371 372 q2 = fepriv->quality - 128; 373 q2 *= q2; 374 375 fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128); 376} 377 378/** 379 * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend 380 * parameters. 381 * 382 * @fe: The frontend concerned. 383 * @check_wrapped: Checks if an iteration has completed. 384 * DO NOT SET ON THE FIRST ATTEMPT. 385 * 386 * return: Number of complete iterations that have been performed. 387 */ 388static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped) 389{ 390 int autoinversion; 391 int ready = 0; 392 int fe_set_err = 0; 393 struct dvb_frontend_private *fepriv = fe->frontend_priv; 394 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp; 395 int original_inversion = c->inversion; 396 u32 original_frequency = c->frequency; 397 398 /* are we using autoinversion? */ 399 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) && 400 (c->inversion == INVERSION_AUTO)); 401 402 /* setup parameters correctly */ 403 while (!ready) { 404 /* calculate the lnb_drift */ 405 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; 406 407 /* wrap the auto_step if we've exceeded the maximum drift */ 408 if (fepriv->lnb_drift > fepriv->max_drift) { 409 fepriv->auto_step = 0; 410 fepriv->auto_sub_step = 0; 411 fepriv->lnb_drift = 0; 412 } 413 414 /* perform inversion and +/- zigzag */ 415 switch (fepriv->auto_sub_step) { 416 case 0: 417 /* try with the current inversion and current drift setting */ 418 ready = 1; 419 break; 420 421 case 1: 422 if (!autoinversion) break; 423 424 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; 425 ready = 1; 426 break; 427 428 case 2: 429 if (fepriv->lnb_drift == 0) break; 430 431 fepriv->lnb_drift = -fepriv->lnb_drift; 432 ready = 1; 433 break; 434 435 case 3: 436 if (fepriv->lnb_drift == 0) break; 437 if (!autoinversion) break; 438 439 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; 440 fepriv->lnb_drift = -fepriv->lnb_drift; 441 ready = 1; 442 break; 443 444 default: 445 fepriv->auto_step++; 446 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ 447 break; 448 } 449 450 if (!ready) fepriv->auto_sub_step++; 451 } 452 453 /* if this attempt would hit where we started, indicate a complete 454 * iteration has occurred */ 455 if ((fepriv->auto_step == fepriv->started_auto_step) && 456 (fepriv->auto_sub_step == 0) && check_wrapped) { 457 return 1; 458 } 459 460 dev_dbg(fe->dvb->device, 461 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n", 462 __func__, fepriv->lnb_drift, fepriv->inversion, 463 fepriv->auto_step, fepriv->auto_sub_step, 464 fepriv->started_auto_step); 465 466 /* set the frontend itself */ 467 c->frequency += fepriv->lnb_drift; 468 if (autoinversion) 469 c->inversion = fepriv->inversion; 470 tmp = *c; 471 if (fe->ops.set_frontend) 472 fe_set_err = fe->ops.set_frontend(fe); 473 *c = tmp; 474 if (fe_set_err < 0) { 475 fepriv->state = FESTATE_ERROR; 476 return fe_set_err; 477 } 478 479 c->frequency = original_frequency; 480 c->inversion = original_inversion; 481 482 fepriv->auto_sub_step++; 483 return 0; 484} 485 486static void dvb_frontend_swzigzag(struct dvb_frontend *fe) 487{ 488 enum fe_status s = FE_NONE; 489 int retval = 0; 490 struct dvb_frontend_private *fepriv = fe->frontend_priv; 491 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp; 492 493 if (fepriv->max_drift) 494 dev_warn_once(fe->dvb->device, 495 "Frontend requested software zigzag, but didn't set the frequency step size\n"); 496 497 /* if we've got no parameters, just keep idling */ 498 if (fepriv->state & FESTATE_IDLE) { 499 fepriv->delay = 3 * HZ; 500 fepriv->quality = 0; 501 return; 502 } 503 504 /* in SCAN mode, we just set the frontend when asked and leave it alone */ 505 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) { 506 if (fepriv->state & FESTATE_RETUNE) { 507 tmp = *c; 508 if (fe->ops.set_frontend) 509 retval = fe->ops.set_frontend(fe); 510 *c = tmp; 511 if (retval < 0) 512 fepriv->state = FESTATE_ERROR; 513 else 514 fepriv->state = FESTATE_TUNED; 515 } 516 fepriv->delay = 3 * HZ; 517 fepriv->quality = 0; 518 return; 519 } 520 521 /* get the frontend status */ 522 if (fepriv->state & FESTATE_RETUNE) { 523 s = 0; 524 } else { 525 if (fe->ops.read_status) 526 fe->ops.read_status(fe, &s); 527 if (s != fepriv->status) { 528 dvb_frontend_add_event(fe, s); 529 fepriv->status = s; 530 } 531 } 532 533 /* if we're not tuned, and we have a lock, move to the TUNED state */ 534 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { 535 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); 536 fepriv->state = FESTATE_TUNED; 537 538 /* if we're tuned, then we have determined the correct inversion */ 539 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) && 540 (c->inversion == INVERSION_AUTO)) { 541 c->inversion = fepriv->inversion; 542 } 543 return; 544 } 545 546 /* if we are tuned already, check we're still locked */ 547 if (fepriv->state & FESTATE_TUNED) { 548 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); 549 550 /* we're tuned, and the lock is still good... */ 551 if (s & FE_HAS_LOCK) { 552 return; 553 } else { /* if we _WERE_ tuned, but now don't have a lock */ 554 fepriv->state = FESTATE_ZIGZAG_FAST; 555 fepriv->started_auto_step = fepriv->auto_step; 556 fepriv->check_wrapped = 0; 557 } 558 } 559 560 /* don't actually do anything if we're in the LOSTLOCK state, 561 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ 562 if ((fepriv->state & FESTATE_LOSTLOCK) && 563 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { 564 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); 565 return; 566 } 567 568 /* don't do anything if we're in the DISEQC state, since this 569 * might be someone with a motorized dish controlled by DISEQC. 570 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ 571 if (fepriv->state & FESTATE_DISEQC) { 572 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); 573 return; 574 } 575 576 /* if we're in the RETUNE state, set everything up for a brand 577 * new scan, keeping the current inversion setting, as the next 578 * tune is _very_ likely to require the same */ 579 if (fepriv->state & FESTATE_RETUNE) { 580 fepriv->lnb_drift = 0; 581 fepriv->auto_step = 0; 582 fepriv->auto_sub_step = 0; 583 fepriv->started_auto_step = 0; 584 fepriv->check_wrapped = 0; 585 } 586 587 /* fast zigzag. */ 588 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { 589 fepriv->delay = fepriv->min_delay; 590 591 /* perform a tune */ 592 retval = dvb_frontend_swzigzag_autotune(fe, 593 fepriv->check_wrapped); 594 if (retval < 0) { 595 return; 596 } else if (retval) { 597 /* OK, if we've run out of trials at the fast speed. 598 * Drop back to slow for the _next_ attempt */ 599 fepriv->state = FESTATE_SEARCHING_SLOW; 600 fepriv->started_auto_step = fepriv->auto_step; 601 return; 602 } 603 fepriv->check_wrapped = 1; 604 605 /* if we've just re-tuned, enter the ZIGZAG_FAST state. 606 * This ensures we cannot return from an 607 * FE_SET_FRONTEND ioctl before the first frontend tune 608 * occurs */ 609 if (fepriv->state & FESTATE_RETUNE) { 610 fepriv->state = FESTATE_TUNING_FAST; 611 } 612 } 613 614 /* slow zigzag */ 615 if (fepriv->state & FESTATE_SEARCHING_SLOW) { 616 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); 617 618 /* Note: don't bother checking for wrapping; we stay in this 619 * state until we get a lock */ 620 dvb_frontend_swzigzag_autotune(fe, 0); 621 } 622} 623 624static int dvb_frontend_is_exiting(struct dvb_frontend *fe) 625{ 626 struct dvb_frontend_private *fepriv = fe->frontend_priv; 627 628 if (fe->exit != DVB_FE_NO_EXIT) 629 return 1; 630 631 if (fepriv->dvbdev->writers == 1) 632 if (time_after_eq(jiffies, fepriv->release_jiffies + 633 dvb_shutdown_timeout * HZ)) 634 return 1; 635 636 return 0; 637} 638 639static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) 640{ 641 struct dvb_frontend_private *fepriv = fe->frontend_priv; 642 643 if (fepriv->wakeup) { 644 fepriv->wakeup = 0; 645 return 1; 646 } 647 return dvb_frontend_is_exiting(fe); 648} 649 650static void dvb_frontend_wakeup(struct dvb_frontend *fe) 651{ 652 struct dvb_frontend_private *fepriv = fe->frontend_priv; 653 654 fepriv->wakeup = 1; 655 wake_up_interruptible(&fepriv->wait_queue); 656} 657 658static int dvb_frontend_thread(void *data) 659{ 660 struct dvb_frontend *fe = data; 661 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 662 struct dvb_frontend_private *fepriv = fe->frontend_priv; 663 enum fe_status s = FE_NONE; 664 enum dvbfe_algo algo; 665 bool re_tune = false; 666 bool semheld = false; 667 668 dev_dbg(fe->dvb->device, "%s:\n", __func__); 669 670 fepriv->check_wrapped = 0; 671 fepriv->quality = 0; 672 fepriv->delay = 3 * HZ; 673 fepriv->status = 0; 674 fepriv->wakeup = 0; 675 fepriv->reinitialise = 0; 676 677 dvb_frontend_init(fe); 678 679 set_freezable(); 680 while (1) { 681 up(&fepriv->sem); /* is locked when we enter the thread... */ 682 wait_event_freezable_timeout(fepriv->wait_queue, 683 dvb_frontend_should_wakeup(fe) || 684 kthread_should_stop(), 685 fepriv->delay); 686 687 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) { 688 /* got signal or quitting */ 689 if (!down_interruptible(&fepriv->sem)) 690 semheld = true; 691 fe->exit = DVB_FE_NORMAL_EXIT; 692 break; 693 } 694 695 if (down_interruptible(&fepriv->sem)) 696 break; 697 698 if (fepriv->reinitialise) { 699 dvb_frontend_init(fe); 700 if (fe->ops.set_tone && fepriv->tone != -1) 701 fe->ops.set_tone(fe, fepriv->tone); 702 if (fe->ops.set_voltage && fepriv->voltage != -1) 703 fe->ops.set_voltage(fe, fepriv->voltage); 704 fepriv->reinitialise = 0; 705 } 706 707 /* do an iteration of the tuning loop */ 708 if (fe->ops.get_frontend_algo) { 709 algo = fe->ops.get_frontend_algo(fe); 710 switch (algo) { 711 case DVBFE_ALGO_HW: 712 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__); 713 714 if (fepriv->state & FESTATE_RETUNE) { 715 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__); 716 re_tune = true; 717 fepriv->state = FESTATE_TUNED; 718 } else { 719 re_tune = false; 720 } 721 722 if (fe->ops.tune) 723 fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s); 724 725 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) { 726 dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__); 727 dvb_frontend_add_event(fe, s); 728 fepriv->status = s; 729 } 730 break; 731 case DVBFE_ALGO_SW: 732 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__); 733 dvb_frontend_swzigzag(fe); 734 break; 735 case DVBFE_ALGO_CUSTOM: 736 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state); 737 if (fepriv->state & FESTATE_RETUNE) { 738 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__); 739 fepriv->state = FESTATE_TUNED; 740 } 741 /* Case where we are going to search for a carrier 742 * User asked us to retune again for some reason, possibly 743 * requesting a search with a new set of parameters 744 */ 745 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) { 746 if (fe->ops.search) { 747 fepriv->algo_status = fe->ops.search(fe); 748 /* We did do a search as was requested, the flags are 749 * now unset as well and has the flags wrt to search. 750 */ 751 } else { 752 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN; 753 } 754 } 755 /* Track the carrier if the search was successful */ 756 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) { 757 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN; 758 fepriv->delay = HZ / 2; 759 } 760 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out); 761 fe->ops.read_status(fe, &s); 762 if (s != fepriv->status) { 763 dvb_frontend_add_event(fe, s); /* update event list */ 764 fepriv->status = s; 765 if (!(s & FE_HAS_LOCK)) { 766 fepriv->delay = HZ / 10; 767 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN; 768 } else { 769 fepriv->delay = 60 * HZ; 770 } 771 } 772 break; 773 default: 774 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__); 775 break; 776 } 777 } else { 778 dvb_frontend_swzigzag(fe); 779 } 780 } 781 782 if (dvb_powerdown_on_sleep) { 783 if (fe->ops.set_voltage) 784 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF); 785 if (fe->ops.tuner_ops.sleep) { 786 if (fe->ops.i2c_gate_ctrl) 787 fe->ops.i2c_gate_ctrl(fe, 1); 788 fe->ops.tuner_ops.sleep(fe); 789 if (fe->ops.i2c_gate_ctrl) 790 fe->ops.i2c_gate_ctrl(fe, 0); 791 } 792 if (fe->ops.sleep) 793 fe->ops.sleep(fe); 794 } 795 796 fepriv->thread = NULL; 797 if (kthread_should_stop()) 798 fe->exit = DVB_FE_DEVICE_REMOVED; 799 else 800 fe->exit = DVB_FE_NO_EXIT; 801 mb(); 802 803 if (semheld) 804 up(&fepriv->sem); 805 dvb_frontend_wakeup(fe); 806 return 0; 807} 808 809static void dvb_frontend_stop(struct dvb_frontend *fe) 810{ 811 struct dvb_frontend_private *fepriv = fe->frontend_priv; 812 813 dev_dbg(fe->dvb->device, "%s:\n", __func__); 814 815 if (fe->exit != DVB_FE_DEVICE_REMOVED) 816 fe->exit = DVB_FE_NORMAL_EXIT; 817 mb(); 818 819 if (!fepriv->thread) 820 return; 821 822 kthread_stop(fepriv->thread); 823 824 sema_init(&fepriv->sem, 1); 825 fepriv->state = FESTATE_IDLE; 826 827 /* paranoia check in case a signal arrived */ 828 if (fepriv->thread) 829 dev_warn(fe->dvb->device, 830 "dvb_frontend_stop: warning: thread %p won't exit\n", 831 fepriv->thread); 832} 833 834/* 835 * Sleep for the amount of time given by add_usec parameter 836 * 837 * This needs to be as precise as possible, as it affects the detection of 838 * the dish tone command at the satellite subsystem. The precision is improved 839 * by using a scheduled msleep followed by udelay for the remainder. 840 */ 841void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec) 842{ 843 s32 delta; 844 845 *waketime = ktime_add_us(*waketime, add_usec); 846 delta = ktime_us_delta(ktime_get_boottime(), *waketime); 847 if (delta > 2500) { 848 msleep((delta - 1500) / 1000); 849 delta = ktime_us_delta(ktime_get_boottime(), *waketime); 850 } 851 if (delta > 0) 852 udelay(delta); 853} 854EXPORT_SYMBOL(dvb_frontend_sleep_until); 855 856static int dvb_frontend_start(struct dvb_frontend *fe) 857{ 858 int ret; 859 struct dvb_frontend_private *fepriv = fe->frontend_priv; 860 struct task_struct *fe_thread; 861 862 dev_dbg(fe->dvb->device, "%s:\n", __func__); 863 864 if (fepriv->thread) { 865 if (fe->exit == DVB_FE_NO_EXIT) 866 return 0; 867 else 868 dvb_frontend_stop(fe); 869 } 870 871 if (signal_pending(current)) 872 return -EINTR; 873 if (down_interruptible(&fepriv->sem)) 874 return -EINTR; 875 876 fepriv->state = FESTATE_IDLE; 877 fe->exit = DVB_FE_NO_EXIT; 878 fepriv->thread = NULL; 879 mb(); 880 881 fe_thread = kthread_run(dvb_frontend_thread, fe, 882 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id); 883 if (IS_ERR(fe_thread)) { 884 ret = PTR_ERR(fe_thread); 885 dev_warn(fe->dvb->device, 886 "dvb_frontend_start: failed to start kthread (%d)\n", 887 ret); 888 up(&fepriv->sem); 889 return ret; 890 } 891 fepriv->thread = fe_thread; 892 return 0; 893} 894 895static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe, 896 u32 *freq_min, u32 *freq_max, 897 u32 *tolerance) 898{ 899 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 900 u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz; 901 u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz; 902 u32 frontend_min = fe->ops.info.frequency_min_hz; 903 u32 frontend_max = fe->ops.info.frequency_max_hz; 904 905 *freq_min = max(frontend_min, tuner_min); 906 907 if (frontend_max == 0) 908 *freq_max = tuner_max; 909 else if (tuner_max == 0) 910 *freq_max = frontend_max; 911 else 912 *freq_max = min(frontend_max, tuner_max); 913 914 if (*freq_min == 0 || *freq_max == 0) 915 dev_warn(fe->dvb->device, 916 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n", 917 fe->dvb->num, fe->id); 918 919 dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u", 920 tuner_min, tuner_max, frontend_min, frontend_max); 921 922 /* If the standard is for satellite, convert frequencies to kHz */ 923 switch (c->delivery_system) { 924 case SYS_DSS: 925 case SYS_DVBS: 926 case SYS_DVBS2: 927 case SYS_TURBO: 928 case SYS_ISDBS: 929 *freq_min /= kHz; 930 *freq_max /= kHz; 931 if (tolerance) 932 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz; 933 934 break; 935 default: 936 if (tolerance) 937 *tolerance = fe->ops.info.frequency_tolerance_hz; 938 break; 939 } 940} 941 942static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe) 943{ 944 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 945 u32 fe_step = fe->ops.info.frequency_stepsize_hz; 946 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz; 947 u32 step = max(fe_step, tuner_step); 948 949 switch (c->delivery_system) { 950 case SYS_DSS: 951 case SYS_DVBS: 952 case SYS_DVBS2: 953 case SYS_TURBO: 954 case SYS_ISDBS: 955 step /= kHz; 956 break; 957 default: 958 break; 959 } 960 961 return step; 962} 963 964static int dvb_frontend_check_parameters(struct dvb_frontend *fe) 965{ 966 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 967 u32 freq_min; 968 u32 freq_max; 969 970 /* range check: frequency */ 971 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL); 972 if ((freq_min && c->frequency < freq_min) || 973 (freq_max && c->frequency > freq_max)) { 974 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n", 975 fe->dvb->num, fe->id, c->frequency, 976 freq_min, freq_max); 977 return -EINVAL; 978 } 979 980 /* range check: symbol rate */ 981 switch (c->delivery_system) { 982 case SYS_DSS: 983 case SYS_DVBS: 984 case SYS_DVBS2: 985 case SYS_TURBO: 986 case SYS_DVBC_ANNEX_A: 987 case SYS_DVBC_ANNEX_C: 988 if ((fe->ops.info.symbol_rate_min && 989 c->symbol_rate < fe->ops.info.symbol_rate_min) || 990 (fe->ops.info.symbol_rate_max && 991 c->symbol_rate > fe->ops.info.symbol_rate_max)) { 992 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n", 993 fe->dvb->num, fe->id, c->symbol_rate, 994 fe->ops.info.symbol_rate_min, 995 fe->ops.info.symbol_rate_max); 996 return -EINVAL; 997 } 998 break; 999 default: 1000 break; 1001 } 1002 1003 return 0; 1004} 1005 1006static 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 dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n", 1017 __func__, c->delivery_system); 1018 1019 c->transmission_mode = TRANSMISSION_MODE_AUTO; 1020 c->bandwidth_hz = 0; /* AUTO */ 1021 c->guard_interval = GUARD_INTERVAL_AUTO; 1022 c->hierarchy = HIERARCHY_AUTO; 1023 c->symbol_rate = 0; 1024 c->code_rate_HP = FEC_AUTO; 1025 c->code_rate_LP = FEC_AUTO; 1026 c->fec_inner = FEC_AUTO; 1027 c->rolloff = ROLLOFF_AUTO; 1028 c->voltage = SEC_VOLTAGE_OFF; 1029 c->sectone = SEC_TONE_OFF; 1030 c->pilot = PILOT_AUTO; 1031 1032 c->isdbt_partial_reception = 0; 1033 c->isdbt_sb_mode = 0; 1034 c->isdbt_sb_subchannel = 0; 1035 c->isdbt_sb_segment_idx = 0; 1036 c->isdbt_sb_segment_count = 0; 1037 c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */ 1038 for (i = 0; i < 3; i++) { 1039 c->layer[i].fec = FEC_AUTO; 1040 c->layer[i].modulation = QAM_AUTO; 1041 c->layer[i].interleaving = 0; 1042 c->layer[i].segment_count = 0; 1043 } 1044 1045 c->stream_id = NO_STREAM_ID_FILTER; 1046 c->scrambling_sequence_index = 0;/* default sequence */ 1047 1048 switch (c->delivery_system) { 1049 case SYS_DSS: 1050 c->modulation = QPSK; 1051 c->rolloff = ROLLOFF_20; 1052 break; 1053 case SYS_DVBS: 1054 case SYS_DVBS2: 1055 case SYS_TURBO: 1056 c->modulation = QPSK; /* implied for DVB-S in legacy API */ 1057 c->rolloff = ROLLOFF_35;/* implied for DVB-S */ 1058 break; 1059 case SYS_ATSC: 1060 c->modulation = VSB_8; 1061 break; 1062 case SYS_ISDBS: 1063 c->symbol_rate = 28860000; 1064 c->rolloff = ROLLOFF_35; 1065 c->bandwidth_hz = c->symbol_rate / 100 * 135; 1066 break; 1067 default: 1068 c->modulation = QAM_AUTO; 1069 break; 1070 } 1071 1072 c->lna = LNA_AUTO; 1073 1074 return 0; 1075} 1076 1077#define _DTV_CMD(n) \ 1078 [n] = #n 1079 1080static char *dtv_cmds[DTV_MAX_COMMAND + 1] = { 1081 _DTV_CMD(DTV_TUNE), 1082 _DTV_CMD(DTV_CLEAR), 1083 1084 /* Set */ 1085 _DTV_CMD(DTV_FREQUENCY), 1086 _DTV_CMD(DTV_BANDWIDTH_HZ), 1087 _DTV_CMD(DTV_MODULATION), 1088 _DTV_CMD(DTV_INVERSION), 1089 _DTV_CMD(DTV_DISEQC_MASTER), 1090 _DTV_CMD(DTV_SYMBOL_RATE), 1091 _DTV_CMD(DTV_INNER_FEC), 1092 _DTV_CMD(DTV_VOLTAGE), 1093 _DTV_CMD(DTV_TONE), 1094 _DTV_CMD(DTV_PILOT), 1095 _DTV_CMD(DTV_ROLLOFF), 1096 _DTV_CMD(DTV_DELIVERY_SYSTEM), 1097 _DTV_CMD(DTV_HIERARCHY), 1098 _DTV_CMD(DTV_CODE_RATE_HP), 1099 _DTV_CMD(DTV_CODE_RATE_LP), 1100 _DTV_CMD(DTV_GUARD_INTERVAL), 1101 _DTV_CMD(DTV_TRANSMISSION_MODE), 1102 _DTV_CMD(DTV_INTERLEAVING), 1103 1104 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION), 1105 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING), 1106 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID), 1107 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX), 1108 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT), 1109 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED), 1110 _DTV_CMD(DTV_ISDBT_LAYERA_FEC), 1111 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION), 1112 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT), 1113 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING), 1114 _DTV_CMD(DTV_ISDBT_LAYERB_FEC), 1115 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION), 1116 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT), 1117 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING), 1118 _DTV_CMD(DTV_ISDBT_LAYERC_FEC), 1119 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION), 1120 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT), 1121 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING), 1122 1123 _DTV_CMD(DTV_STREAM_ID), 1124 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY), 1125 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX), 1126 _DTV_CMD(DTV_LNA), 1127 1128 /* Get */ 1129 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY), 1130 _DTV_CMD(DTV_API_VERSION), 1131 1132 _DTV_CMD(DTV_ENUM_DELSYS), 1133 1134 _DTV_CMD(DTV_ATSCMH_PARADE_ID), 1135 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE), 1136 1137 _DTV_CMD(DTV_ATSCMH_FIC_VER), 1138 _DTV_CMD(DTV_ATSCMH_NOG), 1139 _DTV_CMD(DTV_ATSCMH_TNOG), 1140 _DTV_CMD(DTV_ATSCMH_SGN), 1141 _DTV_CMD(DTV_ATSCMH_PRC), 1142 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE), 1143 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI), 1144 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC), 1145 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE), 1146 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A), 1147 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B), 1148 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C), 1149 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D), 1150 1151 /* Statistics API */ 1152 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH), 1153 _DTV_CMD(DTV_STAT_CNR), 1154 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT), 1155 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT), 1156 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT), 1157 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT), 1158 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT), 1159 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT), 1160}; 1161 1162static char *dtv_cmd_name(u32 cmd) 1163{ 1164 cmd = array_index_nospec(cmd, DTV_MAX_COMMAND); 1165 return dtv_cmds[cmd]; 1166} 1167 1168/* Synchronise the legacy tuning parameters into the cache, so that demodulator 1169 * drivers can use a single set_frontend tuning function, regardless of whether 1170 * it's being used for the legacy or new API, reducing code and complexity. 1171 */ 1172static int dtv_property_cache_sync(struct dvb_frontend *fe, 1173 struct dtv_frontend_properties *c, 1174 const struct dvb_frontend_parameters *p) 1175{ 1176 c->frequency = p->frequency; 1177 c->inversion = p->inversion; 1178 1179 switch (dvbv3_type(c->delivery_system)) { 1180 case DVBV3_QPSK: 1181 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__); 1182 c->symbol_rate = p->u.qpsk.symbol_rate; 1183 c->fec_inner = p->u.qpsk.fec_inner; 1184 break; 1185 case DVBV3_QAM: 1186 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__); 1187 c->symbol_rate = p->u.qam.symbol_rate; 1188 c->fec_inner = p->u.qam.fec_inner; 1189 c->modulation = p->u.qam.modulation; 1190 break; 1191 case DVBV3_OFDM: 1192 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__); 1193 1194 switch (p->u.ofdm.bandwidth) { 1195 case BANDWIDTH_10_MHZ: 1196 c->bandwidth_hz = 10000000; 1197 break; 1198 case BANDWIDTH_8_MHZ: 1199 c->bandwidth_hz = 8000000; 1200 break; 1201 case BANDWIDTH_7_MHZ: 1202 c->bandwidth_hz = 7000000; 1203 break; 1204 case BANDWIDTH_6_MHZ: 1205 c->bandwidth_hz = 6000000; 1206 break; 1207 case BANDWIDTH_5_MHZ: 1208 c->bandwidth_hz = 5000000; 1209 break; 1210 case BANDWIDTH_1_712_MHZ: 1211 c->bandwidth_hz = 1712000; 1212 break; 1213 case BANDWIDTH_AUTO: 1214 c->bandwidth_hz = 0; 1215 } 1216 1217 c->code_rate_HP = p->u.ofdm.code_rate_HP; 1218 c->code_rate_LP = p->u.ofdm.code_rate_LP; 1219 c->modulation = p->u.ofdm.constellation; 1220 c->transmission_mode = p->u.ofdm.transmission_mode; 1221 c->guard_interval = p->u.ofdm.guard_interval; 1222 c->hierarchy = p->u.ofdm.hierarchy_information; 1223 break; 1224 case DVBV3_ATSC: 1225 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__); 1226 c->modulation = p->u.vsb.modulation; 1227 if (c->delivery_system == SYS_ATSCMH) 1228 break; 1229 if ((c->modulation == VSB_8) || (c->modulation == VSB_16)) 1230 c->delivery_system = SYS_ATSC; 1231 else 1232 c->delivery_system = SYS_DVBC_ANNEX_B; 1233 break; 1234 case DVBV3_UNKNOWN: 1235 dev_err(fe->dvb->device, 1236 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n", 1237 __func__, c->delivery_system); 1238 return -EINVAL; 1239 } 1240 1241 return 0; 1242} 1243 1244/* Ensure the cached values are set correctly in the frontend 1245 * legacy tuning structures, for the advanced tuning API. 1246 */ 1247static int 1248dtv_property_legacy_params_sync(struct dvb_frontend *fe, 1249 const struct dtv_frontend_properties *c, 1250 struct dvb_frontend_parameters *p) 1251{ 1252 p->frequency = c->frequency; 1253 p->inversion = c->inversion; 1254 1255 switch (dvbv3_type(c->delivery_system)) { 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 case DVBV3_QPSK: 1262 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__); 1263 p->u.qpsk.symbol_rate = c->symbol_rate; 1264 p->u.qpsk.fec_inner = c->fec_inner; 1265 break; 1266 case DVBV3_QAM: 1267 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__); 1268 p->u.qam.symbol_rate = c->symbol_rate; 1269 p->u.qam.fec_inner = c->fec_inner; 1270 p->u.qam.modulation = c->modulation; 1271 break; 1272 case DVBV3_OFDM: 1273 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__); 1274 switch (c->bandwidth_hz) { 1275 case 10000000: 1276 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ; 1277 break; 1278 case 8000000: 1279 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ; 1280 break; 1281 case 7000000: 1282 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ; 1283 break; 1284 case 6000000: 1285 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ; 1286 break; 1287 case 5000000: 1288 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ; 1289 break; 1290 case 1712000: 1291 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ; 1292 break; 1293 case 0: 1294 default: 1295 p->u.ofdm.bandwidth = BANDWIDTH_AUTO; 1296 } 1297 p->u.ofdm.code_rate_HP = c->code_rate_HP; 1298 p->u.ofdm.code_rate_LP = c->code_rate_LP; 1299 p->u.ofdm.constellation = c->modulation; 1300 p->u.ofdm.transmission_mode = c->transmission_mode; 1301 p->u.ofdm.guard_interval = c->guard_interval; 1302 p->u.ofdm.hierarchy_information = c->hierarchy; 1303 break; 1304 case DVBV3_ATSC: 1305 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__); 1306 p->u.vsb.modulation = c->modulation; 1307 break; 1308 } 1309 return 0; 1310} 1311 1312/** 1313 * dtv_get_frontend - calls a callback for retrieving DTV parameters 1314 * @fe: struct dvb_frontend pointer 1315 * @c: struct dtv_frontend_properties pointer (DVBv5 cache) 1316 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct) 1317 * 1318 * This routine calls either the DVBv3 or DVBv5 get_frontend call. 1319 * If c is not null, it will update the DVBv5 cache struct pointed by it. 1320 * If p_out is not null, it will update the DVBv3 params pointed by it. 1321 */ 1322static int dtv_get_frontend(struct dvb_frontend *fe, 1323 struct dtv_frontend_properties *c, 1324 struct dvb_frontend_parameters *p_out) 1325{ 1326 int r; 1327 1328 if (fe->ops.get_frontend) { 1329 r = fe->ops.get_frontend(fe, c); 1330 if (unlikely(r < 0)) 1331 return r; 1332 if (p_out) 1333 dtv_property_legacy_params_sync(fe, c, p_out); 1334 return 0; 1335 } 1336 1337 /* As everything is in cache, get_frontend fops are always supported */ 1338 return 0; 1339} 1340 1341static int dvb_frontend_handle_ioctl(struct file *file, 1342 unsigned int cmd, void *parg); 1343 1344static int dtv_property_process_get(struct dvb_frontend *fe, 1345 const struct dtv_frontend_properties *c, 1346 struct dtv_property *tvp, 1347 struct file *file) 1348{ 1349 int ncaps; 1350 unsigned int len = 1; 1351 1352 switch (tvp->cmd) { 1353 case DTV_ENUM_DELSYS: 1354 ncaps = 0; 1355 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) { 1356 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps]; 1357 ncaps++; 1358 } 1359 tvp->u.buffer.len = ncaps; 1360 len = ncaps; 1361 break; 1362 case DTV_FREQUENCY: 1363 tvp->u.data = c->frequency; 1364 break; 1365 case DTV_MODULATION: 1366 tvp->u.data = c->modulation; 1367 break; 1368 case DTV_BANDWIDTH_HZ: 1369 tvp->u.data = c->bandwidth_hz; 1370 break; 1371 case DTV_INVERSION: 1372 tvp->u.data = c->inversion; 1373 break; 1374 case DTV_SYMBOL_RATE: 1375 tvp->u.data = c->symbol_rate; 1376 break; 1377 case DTV_INNER_FEC: 1378 tvp->u.data = c->fec_inner; 1379 break; 1380 case DTV_PILOT: 1381 tvp->u.data = c->pilot; 1382 break; 1383 case DTV_ROLLOFF: 1384 tvp->u.data = c->rolloff; 1385 break; 1386 case DTV_DELIVERY_SYSTEM: 1387 tvp->u.data = c->delivery_system; 1388 break; 1389 case DTV_VOLTAGE: 1390 tvp->u.data = c->voltage; 1391 break; 1392 case DTV_TONE: 1393 tvp->u.data = c->sectone; 1394 break; 1395 case DTV_API_VERSION: 1396 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR; 1397 break; 1398 case DTV_CODE_RATE_HP: 1399 tvp->u.data = c->code_rate_HP; 1400 break; 1401 case DTV_CODE_RATE_LP: 1402 tvp->u.data = c->code_rate_LP; 1403 break; 1404 case DTV_GUARD_INTERVAL: 1405 tvp->u.data = c->guard_interval; 1406 break; 1407 case DTV_TRANSMISSION_MODE: 1408 tvp->u.data = c->transmission_mode; 1409 break; 1410 case DTV_HIERARCHY: 1411 tvp->u.data = c->hierarchy; 1412 break; 1413 case DTV_INTERLEAVING: 1414 tvp->u.data = c->interleaving; 1415 break; 1416 1417 /* ISDB-T Support here */ 1418 case DTV_ISDBT_PARTIAL_RECEPTION: 1419 tvp->u.data = c->isdbt_partial_reception; 1420 break; 1421 case DTV_ISDBT_SOUND_BROADCASTING: 1422 tvp->u.data = c->isdbt_sb_mode; 1423 break; 1424 case DTV_ISDBT_SB_SUBCHANNEL_ID: 1425 tvp->u.data = c->isdbt_sb_subchannel; 1426 break; 1427 case DTV_ISDBT_SB_SEGMENT_IDX: 1428 tvp->u.data = c->isdbt_sb_segment_idx; 1429 break; 1430 case DTV_ISDBT_SB_SEGMENT_COUNT: 1431 tvp->u.data = c->isdbt_sb_segment_count; 1432 break; 1433 case DTV_ISDBT_LAYER_ENABLED: 1434 tvp->u.data = c->isdbt_layer_enabled; 1435 break; 1436 case DTV_ISDBT_LAYERA_FEC: 1437 tvp->u.data = c->layer[0].fec; 1438 break; 1439 case DTV_ISDBT_LAYERA_MODULATION: 1440 tvp->u.data = c->layer[0].modulation; 1441 break; 1442 case DTV_ISDBT_LAYERA_SEGMENT_COUNT: 1443 tvp->u.data = c->layer[0].segment_count; 1444 break; 1445 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING: 1446 tvp->u.data = c->layer[0].interleaving; 1447 break; 1448 case DTV_ISDBT_LAYERB_FEC: 1449 tvp->u.data = c->layer[1].fec; 1450 break; 1451 case DTV_ISDBT_LAYERB_MODULATION: 1452 tvp->u.data = c->layer[1].modulation; 1453 break; 1454 case DTV_ISDBT_LAYERB_SEGMENT_COUNT: 1455 tvp->u.data = c->layer[1].segment_count; 1456 break; 1457 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING: 1458 tvp->u.data = c->layer[1].interleaving; 1459 break; 1460 case DTV_ISDBT_LAYERC_FEC: 1461 tvp->u.data = c->layer[2].fec; 1462 break; 1463 case DTV_ISDBT_LAYERC_MODULATION: 1464 tvp->u.data = c->layer[2].modulation; 1465 break; 1466 case DTV_ISDBT_LAYERC_SEGMENT_COUNT: 1467 tvp->u.data = c->layer[2].segment_count; 1468 break; 1469 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING: 1470 tvp->u.data = c->layer[2].interleaving; 1471 break; 1472 1473 /* Multistream support */ 1474 case DTV_STREAM_ID: 1475 case DTV_DVBT2_PLP_ID_LEGACY: 1476 tvp->u.data = c->stream_id; 1477 break; 1478 1479 /* Physical layer scrambling support */ 1480 case DTV_SCRAMBLING_SEQUENCE_INDEX: 1481 tvp->u.data = c->scrambling_sequence_index; 1482 break; 1483 1484 /* ATSC-MH */ 1485 case DTV_ATSCMH_FIC_VER: 1486 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver; 1487 break; 1488 case DTV_ATSCMH_PARADE_ID: 1489 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id; 1490 break; 1491 case DTV_ATSCMH_NOG: 1492 tvp->u.data = fe->dtv_property_cache.atscmh_nog; 1493 break; 1494 case DTV_ATSCMH_TNOG: 1495 tvp->u.data = fe->dtv_property_cache.atscmh_tnog; 1496 break; 1497 case DTV_ATSCMH_SGN: 1498 tvp->u.data = fe->dtv_property_cache.atscmh_sgn; 1499 break; 1500 case DTV_ATSCMH_PRC: 1501 tvp->u.data = fe->dtv_property_cache.atscmh_prc; 1502 break; 1503 case DTV_ATSCMH_RS_FRAME_MODE: 1504 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode; 1505 break; 1506 case DTV_ATSCMH_RS_FRAME_ENSEMBLE: 1507 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble; 1508 break; 1509 case DTV_ATSCMH_RS_CODE_MODE_PRI: 1510 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri; 1511 break; 1512 case DTV_ATSCMH_RS_CODE_MODE_SEC: 1513 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec; 1514 break; 1515 case DTV_ATSCMH_SCCC_BLOCK_MODE: 1516 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode; 1517 break; 1518 case DTV_ATSCMH_SCCC_CODE_MODE_A: 1519 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a; 1520 break; 1521 case DTV_ATSCMH_SCCC_CODE_MODE_B: 1522 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b; 1523 break; 1524 case DTV_ATSCMH_SCCC_CODE_MODE_C: 1525 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c; 1526 break; 1527 case DTV_ATSCMH_SCCC_CODE_MODE_D: 1528 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d; 1529 break; 1530 1531 case DTV_LNA: 1532 tvp->u.data = c->lna; 1533 break; 1534 1535 /* Fill quality measures */ 1536 case DTV_STAT_SIGNAL_STRENGTH: 1537 tvp->u.st = c->strength; 1538 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1539 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1540 len = tvp->u.buffer.len; 1541 break; 1542 case DTV_STAT_CNR: 1543 tvp->u.st = c->cnr; 1544 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1545 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1546 len = tvp->u.buffer.len; 1547 break; 1548 case DTV_STAT_PRE_ERROR_BIT_COUNT: 1549 tvp->u.st = c->pre_bit_error; 1550 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1551 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1552 len = tvp->u.buffer.len; 1553 break; 1554 case DTV_STAT_PRE_TOTAL_BIT_COUNT: 1555 tvp->u.st = c->pre_bit_count; 1556 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1557 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1558 len = tvp->u.buffer.len; 1559 break; 1560 case DTV_STAT_POST_ERROR_BIT_COUNT: 1561 tvp->u.st = c->post_bit_error; 1562 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1563 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1564 len = tvp->u.buffer.len; 1565 break; 1566 case DTV_STAT_POST_TOTAL_BIT_COUNT: 1567 tvp->u.st = c->post_bit_count; 1568 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1569 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1570 len = tvp->u.buffer.len; 1571 break; 1572 case DTV_STAT_ERROR_BLOCK_COUNT: 1573 tvp->u.st = c->block_error; 1574 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1575 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1576 len = tvp->u.buffer.len; 1577 break; 1578 case DTV_STAT_TOTAL_BLOCK_COUNT: 1579 tvp->u.st = c->block_count; 1580 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32)) 1581 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32); 1582 len = tvp->u.buffer.len; 1583 break; 1584 default: 1585 dev_dbg(fe->dvb->device, 1586 "%s: FE property %d doesn't exist\n", 1587 __func__, tvp->cmd); 1588 return -EINVAL; 1589 } 1590 1591 if (len < 1) 1592 len = 1; 1593 1594 dev_dbg(fe->dvb->device, 1595 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n", 1596 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd), 1597 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data); 1598 1599 return 0; 1600} 1601 1602static int dtv_set_frontend(struct dvb_frontend *fe); 1603 1604static bool is_dvbv3_delsys(u32 delsys) 1605{ 1606 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) || 1607 (delsys == SYS_DVBS) || (delsys == SYS_ATSC); 1608} 1609 1610/** 1611 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type 1612 * @fe: struct frontend; 1613 * @delsys: DVBv5 type that will be used for emulation 1614 * 1615 * Provides emulation for delivery systems that are compatible with the old 1616 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows 1617 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend 1618 * parameters are compatible with DVB-S spec. 1619 */ 1620static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys) 1621{ 1622 int i; 1623 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 1624 1625 c->delivery_system = delsys; 1626 1627 /* 1628 * If the call is for ISDB-T, put it into full-seg, auto mode, TV 1629 */ 1630 if (c->delivery_system == SYS_ISDBT) { 1631 dev_dbg(fe->dvb->device, 1632 "%s: Using defaults for SYS_ISDBT\n", 1633 __func__); 1634 1635 if (!c->bandwidth_hz) 1636 c->bandwidth_hz = 6000000; 1637 1638 c->isdbt_partial_reception = 0; 1639 c->isdbt_sb_mode = 0; 1640 c->isdbt_sb_subchannel = 0; 1641 c->isdbt_sb_segment_idx = 0; 1642 c->isdbt_sb_segment_count = 0; 1643 c->isdbt_layer_enabled = 7; 1644 for (i = 0; i < 3; i++) { 1645 c->layer[i].fec = FEC_AUTO; 1646 c->layer[i].modulation = QAM_AUTO; 1647 c->layer[i].interleaving = 0; 1648 c->layer[i].segment_count = 0; 1649 } 1650 } 1651 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n", 1652 __func__, c->delivery_system); 1653 1654 return 0; 1655} 1656 1657/** 1658 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call 1659 * @fe: frontend struct 1660 * @desired_system: delivery system requested by the user 1661 * 1662 * A DVBv5 call know what's the desired system it wants. So, set it. 1663 * 1664 * There are, however, a few known issues with early DVBv5 applications that 1665 * are also handled by this logic: 1666 * 1667 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system. 1668 * This is an API violation, but, as we don't want to break userspace, 1669 * convert it to the first supported delivery system. 1670 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for 1671 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of 1672 * ISDB-T provided backward compat with DVB-T. 1673 */ 1674static int dvbv5_set_delivery_system(struct dvb_frontend *fe, 1675 u32 desired_system) 1676{ 1677 int ncaps; 1678 u32 delsys = SYS_UNDEFINED; 1679 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 1680 enum dvbv3_emulation_type type; 1681 1682 /* 1683 * It was reported that some old DVBv5 applications were 1684 * filling delivery_system with SYS_UNDEFINED. If this happens, 1685 * assume that the application wants to use the first supported 1686 * delivery system. 1687 */ 1688 if (desired_system == SYS_UNDEFINED) 1689 desired_system = fe->ops.delsys[0]; 1690 1691 /* 1692 * This is a DVBv5 call. So, it likely knows the supported 1693 * delivery systems. So, check if the desired delivery system is 1694 * supported 1695 */ 1696 ncaps = 0; 1697 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) { 1698 if (fe->ops.delsys[ncaps] == desired_system) { 1699 c->delivery_system = desired_system; 1700 dev_dbg(fe->dvb->device, 1701 "%s: Changing delivery system to %d\n", 1702 __func__, desired_system); 1703 return 0; 1704 } 1705 ncaps++; 1706 } 1707 1708 /* 1709 * The requested delivery system isn't supported. Maybe userspace 1710 * is requesting a DVBv3 compatible delivery system. 1711 * 1712 * The emulation only works if the desired system is one of the 1713 * delivery systems supported by DVBv3 API 1714 */ 1715 if (!is_dvbv3_delsys(desired_system)) { 1716 dev_dbg(fe->dvb->device, 1717 "%s: Delivery system %d not supported.\n", 1718 __func__, desired_system); 1719 return -EINVAL; 1720 } 1721 1722 type = dvbv3_type(desired_system); 1723 1724 /* 1725 * Get the last non-DVBv3 delivery system that has the same type 1726 * of the desired system 1727 */ 1728 ncaps = 0; 1729 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) { 1730 if (dvbv3_type(fe->ops.delsys[ncaps]) == type) 1731 delsys = fe->ops.delsys[ncaps]; 1732 ncaps++; 1733 } 1734 1735 /* There's nothing compatible with the desired delivery system */ 1736 if (delsys == SYS_UNDEFINED) { 1737 dev_dbg(fe->dvb->device, 1738 "%s: Delivery system %d not supported on emulation mode.\n", 1739 __func__, desired_system); 1740 return -EINVAL; 1741 } 1742 1743 dev_dbg(fe->dvb->device, 1744 "%s: Using delivery system %d emulated as if it were %d\n", 1745 __func__, delsys, desired_system); 1746 1747 return emulate_delivery_system(fe, desired_system); 1748} 1749 1750/** 1751 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call 1752 * @fe: frontend struct 1753 * 1754 * A DVBv3 call doesn't know what's the desired system it wants. It also 1755 * doesn't allow to switch between different types. Due to that, userspace 1756 * should use DVBv5 instead. 1757 * However, in order to avoid breaking userspace API, limited backward 1758 * compatibility support is provided. 1759 * 1760 * There are some delivery systems that are incompatible with DVBv3 calls. 1761 * 1762 * This routine should work fine for frontends that support just one delivery 1763 * system. 1764 * 1765 * For frontends that support multiple frontends: 1766 * 1) It defaults to use the first supported delivery system. There's an 1767 * userspace application that allows changing it at runtime; 1768 * 1769 * 2) If the current delivery system is not compatible with DVBv3, it gets 1770 * the first one that it is compatible. 1771 * 1772 * NOTE: in order for this to work with applications like Kaffeine that 1773 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to 1774 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the 1775 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back 1776 * to DVB-S. 1777 */ 1778static int dvbv3_set_delivery_system(struct dvb_frontend *fe) 1779{ 1780 int ncaps; 1781 u32 delsys = SYS_UNDEFINED; 1782 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 1783 1784 /* If not set yet, defaults to the first supported delivery system */ 1785 if (c->delivery_system == SYS_UNDEFINED) 1786 c->delivery_system = fe->ops.delsys[0]; 1787 1788 /* 1789 * Trivial case: just use the current one, if it already a DVBv3 1790 * delivery system 1791 */ 1792 if (is_dvbv3_delsys(c->delivery_system)) { 1793 dev_dbg(fe->dvb->device, 1794 "%s: Using delivery system to %d\n", 1795 __func__, c->delivery_system); 1796 return 0; 1797 } 1798 1799 /* 1800 * Seek for the first delivery system that it is compatible with a 1801 * DVBv3 standard 1802 */ 1803 ncaps = 0; 1804 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) { 1805 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) { 1806 delsys = fe->ops.delsys[ncaps]; 1807 break; 1808 } 1809 ncaps++; 1810 } 1811 if (delsys == SYS_UNDEFINED) { 1812 dev_dbg(fe->dvb->device, 1813 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n", 1814 __func__); 1815 return -EINVAL; 1816 } 1817 return emulate_delivery_system(fe, delsys); 1818} 1819 1820static void prepare_tuning_algo_parameters(struct dvb_frontend *fe) 1821{ 1822 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 1823 struct dvb_frontend_private *fepriv = fe->frontend_priv; 1824 struct dvb_frontend_tune_settings fetunesettings = { 0 }; 1825 1826 /* get frontend-specific tuning settings */ 1827 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) { 1828 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; 1829 fepriv->max_drift = fetunesettings.max_drift; 1830 fepriv->step_size = fetunesettings.step_size; 1831 } else { 1832 /* default values */ 1833 switch (c->delivery_system) { 1834 case SYS_DSS: 1835 case SYS_DVBS: 1836 case SYS_DVBS2: 1837 case SYS_ISDBS: 1838 case SYS_TURBO: 1839 case SYS_DVBC_ANNEX_A: 1840 case SYS_DVBC_ANNEX_C: 1841 fepriv->min_delay = HZ / 20; 1842 fepriv->step_size = c->symbol_rate / 16000; 1843 fepriv->max_drift = c->symbol_rate / 2000; 1844 break; 1845 case SYS_DVBT: 1846 case SYS_DVBT2: 1847 case SYS_ISDBT: 1848 case SYS_DTMB: 1849 fepriv->min_delay = HZ / 20; 1850 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2; 1851 fepriv->max_drift = fepriv->step_size + 1; 1852 break; 1853 default: 1854 /* 1855 * FIXME: This sounds wrong! if freqency_stepsize is 1856 * defined by the frontend, why not use it??? 1857 */ 1858 fepriv->min_delay = HZ / 20; 1859 fepriv->step_size = 0; /* no zigzag */ 1860 fepriv->max_drift = 0; 1861 break; 1862 } 1863 } 1864 if (dvb_override_tune_delay > 0) 1865 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; 1866} 1867 1868/** 1869 * dtv_property_process_set - Sets a single DTV property 1870 * @fe: Pointer to &struct dvb_frontend 1871 * @file: Pointer to &struct file 1872 * @cmd: Digital TV command 1873 * @data: An unsigned 32-bits number 1874 * 1875 * This routine assigns the property 1876 * value to the corresponding member of 1877 * &struct dtv_frontend_properties 1878 * 1879 * Returns: 1880 * Zero on success, negative errno on failure. 1881 */ 1882static int dtv_property_process_set(struct dvb_frontend *fe, 1883 struct file *file, 1884 u32 cmd, u32 data) 1885{ 1886 int r = 0; 1887 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 1888 1889 /** Dump DTV command name and value*/ 1890 if (!cmd || cmd > DTV_MAX_COMMAND) 1891 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n", 1892 __func__, cmd); 1893 else 1894 dev_dbg(fe->dvb->device, 1895 "%s: SET cmd 0x%08x (%s) to 0x%08x\n", 1896 __func__, cmd, dtv_cmd_name(cmd), data); 1897 switch (cmd) { 1898 case DTV_CLEAR: 1899 /* 1900 * Reset a cache of data specific to the frontend here. This does 1901 * not effect hardware. 1902 */ 1903 dvb_frontend_clear_cache(fe); 1904 break; 1905 case DTV_TUNE: 1906 /* 1907 * Use the cached Digital TV properties to tune the 1908 * frontend 1909 */ 1910 dev_dbg(fe->dvb->device, 1911 "%s: Setting the frontend from property cache\n", 1912 __func__); 1913 1914 r = dtv_set_frontend(fe); 1915 break; 1916 case DTV_FREQUENCY: 1917 c->frequency = data; 1918 break; 1919 case DTV_MODULATION: 1920 c->modulation = data; 1921 break; 1922 case DTV_BANDWIDTH_HZ: 1923 c->bandwidth_hz = data; 1924 break; 1925 case DTV_INVERSION: 1926 c->inversion = data; 1927 break; 1928 case DTV_SYMBOL_RATE: 1929 c->symbol_rate = data; 1930 break; 1931 case DTV_INNER_FEC: 1932 c->fec_inner = data; 1933 break; 1934 case DTV_PILOT: 1935 c->pilot = data; 1936 break; 1937 case DTV_ROLLOFF: 1938 c->rolloff = data; 1939 break; 1940 case DTV_DELIVERY_SYSTEM: 1941 r = dvbv5_set_delivery_system(fe, data); 1942 break; 1943 case DTV_VOLTAGE: 1944 c->voltage = data; 1945 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE, 1946 (void *)c->voltage); 1947 break; 1948 case DTV_TONE: 1949 c->sectone = data; 1950 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE, 1951 (void *)c->sectone); 1952 break; 1953 case DTV_CODE_RATE_HP: 1954 c->code_rate_HP = data; 1955 break; 1956 case DTV_CODE_RATE_LP: 1957 c->code_rate_LP = data; 1958 break; 1959 case DTV_GUARD_INTERVAL: 1960 c->guard_interval = data; 1961 break; 1962 case DTV_TRANSMISSION_MODE: 1963 c->transmission_mode = data; 1964 break; 1965 case DTV_HIERARCHY: 1966 c->hierarchy = data; 1967 break; 1968 case DTV_INTERLEAVING: 1969 c->interleaving = data; 1970 break; 1971 1972 /* ISDB-T Support here */ 1973 case DTV_ISDBT_PARTIAL_RECEPTION: 1974 c->isdbt_partial_reception = data; 1975 break; 1976 case DTV_ISDBT_SOUND_BROADCASTING: 1977 c->isdbt_sb_mode = data; 1978 break; 1979 case DTV_ISDBT_SB_SUBCHANNEL_ID: 1980 c->isdbt_sb_subchannel = data; 1981 break; 1982 case DTV_ISDBT_SB_SEGMENT_IDX: 1983 c->isdbt_sb_segment_idx = data; 1984 break; 1985 case DTV_ISDBT_SB_SEGMENT_COUNT: 1986 c->isdbt_sb_segment_count = data; 1987 break; 1988 case DTV_ISDBT_LAYER_ENABLED: 1989 c->isdbt_layer_enabled = data; 1990 break; 1991 case DTV_ISDBT_LAYERA_FEC: 1992 c->layer[0].fec = data; 1993 break; 1994 case DTV_ISDBT_LAYERA_MODULATION: 1995 c->layer[0].modulation = data; 1996 break; 1997 case DTV_ISDBT_LAYERA_SEGMENT_COUNT: 1998 c->layer[0].segment_count = data; 1999 break; 2000 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING: 2001 c->layer[0].interleaving = data; 2002 break; 2003 case DTV_ISDBT_LAYERB_FEC: 2004 c->layer[1].fec = data; 2005 break; 2006 case DTV_ISDBT_LAYERB_MODULATION: 2007 c->layer[1].modulation = data; 2008 break; 2009 case DTV_ISDBT_LAYERB_SEGMENT_COUNT: 2010 c->layer[1].segment_count = data; 2011 break; 2012 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING: 2013 c->layer[1].interleaving = data; 2014 break; 2015 case DTV_ISDBT_LAYERC_FEC: 2016 c->layer[2].fec = data; 2017 break; 2018 case DTV_ISDBT_LAYERC_MODULATION: 2019 c->layer[2].modulation = data; 2020 break; 2021 case DTV_ISDBT_LAYERC_SEGMENT_COUNT: 2022 c->layer[2].segment_count = data; 2023 break; 2024 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING: 2025 c->layer[2].interleaving = data; 2026 break; 2027 2028 /* Multistream support */ 2029 case DTV_STREAM_ID: 2030 case DTV_DVBT2_PLP_ID_LEGACY: 2031 c->stream_id = data; 2032 break; 2033 2034 /* Physical layer scrambling support */ 2035 case DTV_SCRAMBLING_SEQUENCE_INDEX: 2036 c->scrambling_sequence_index = data; 2037 break; 2038 2039 /* ATSC-MH */ 2040 case DTV_ATSCMH_PARADE_ID: 2041 fe->dtv_property_cache.atscmh_parade_id = data; 2042 break; 2043 case DTV_ATSCMH_RS_FRAME_ENSEMBLE: 2044 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data; 2045 break; 2046 2047 case DTV_LNA: 2048 c->lna = data; 2049 if (fe->ops.set_lna) 2050 r = fe->ops.set_lna(fe); 2051 if (r < 0) 2052 c->lna = LNA_AUTO; 2053 break; 2054 2055 default: 2056 return -EINVAL; 2057 } 2058 2059 return r; 2060} 2061 2062static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd, 2063 void *parg) 2064{ 2065 struct dvb_device *dvbdev = file->private_data; 2066 struct dvb_frontend *fe = dvbdev->priv; 2067 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2068 int err; 2069 2070 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd)); 2071 if (down_interruptible(&fepriv->sem)) 2072 return -ERESTARTSYS; 2073 2074 if (fe->exit != DVB_FE_NO_EXIT) { 2075 up(&fepriv->sem); 2076 return -ENODEV; 2077 } 2078 2079 /* 2080 * If the frontend is opened in read-only mode, only the ioctls 2081 * that don't interfere with the tune logic should be accepted. 2082 * That allows an external application to monitor the DVB QoS and 2083 * statistics parameters. 2084 * 2085 * That matches all _IOR() ioctls, except for two special cases: 2086 * - FE_GET_EVENT is part of the tuning logic on a DVB application; 2087 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0 2088 * setup 2089 * So, those two ioctls should also return -EPERM, as otherwise 2090 * reading from them would interfere with a DVB tune application 2091 */ 2092 if ((file->f_flags & O_ACCMODE) == O_RDONLY 2093 && (_IOC_DIR(cmd) != _IOC_READ 2094 || cmd == FE_GET_EVENT 2095 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) { 2096 up(&fepriv->sem); 2097 return -EPERM; 2098 } 2099 2100 err = dvb_frontend_handle_ioctl(file, cmd, parg); 2101 2102 up(&fepriv->sem); 2103 return err; 2104} 2105 2106static long dvb_frontend_ioctl(struct file *file, unsigned int cmd, 2107 unsigned long arg) 2108{ 2109 struct dvb_device *dvbdev = file->private_data; 2110 2111 if (!dvbdev) 2112 return -ENODEV; 2113 2114 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl); 2115} 2116 2117#ifdef CONFIG_COMPAT 2118struct compat_dtv_property { 2119 __u32 cmd; 2120 __u32 reserved[3]; 2121 union { 2122 __u32 data; 2123 struct dtv_fe_stats st; 2124 struct { 2125 __u8 data[32]; 2126 __u32 len; 2127 __u32 reserved1[3]; 2128 compat_uptr_t reserved2; 2129 } buffer; 2130 } u; 2131 int result; 2132} __attribute__ ((packed)); 2133 2134struct compat_dtv_properties { 2135 __u32 num; 2136 compat_uptr_t props; 2137}; 2138 2139#define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties) 2140#define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties) 2141 2142static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd, 2143 unsigned long arg) 2144{ 2145 struct dvb_device *dvbdev = file->private_data; 2146 struct dvb_frontend *fe = dvbdev->priv; 2147 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2148 int i, err = 0; 2149 2150 if (cmd == COMPAT_FE_SET_PROPERTY) { 2151 struct compat_dtv_properties prop, *tvps = NULL; 2152 struct compat_dtv_property *tvp = NULL; 2153 2154 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop))) 2155 return -EFAULT; 2156 2157 tvps = ∝ 2158 2159 /* 2160 * Put an arbitrary limit on the number of messages that can 2161 * be sent at once 2162 */ 2163 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS)) 2164 return -EINVAL; 2165 2166 tvp = memdup_array_user(compat_ptr(tvps->props), 2167 tvps->num, sizeof(*tvp)); 2168 if (IS_ERR(tvp)) 2169 return PTR_ERR(tvp); 2170 2171 for (i = 0; i < tvps->num; i++) { 2172 err = dtv_property_process_set(fe, file, 2173 (tvp + i)->cmd, 2174 (tvp + i)->u.data); 2175 if (err < 0) { 2176 kfree(tvp); 2177 return err; 2178 } 2179 } 2180 kfree(tvp); 2181 } else if (cmd == COMPAT_FE_GET_PROPERTY) { 2182 struct compat_dtv_properties prop, *tvps = NULL; 2183 struct compat_dtv_property *tvp = NULL; 2184 struct dtv_frontend_properties getp = fe->dtv_property_cache; 2185 2186 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop))) 2187 return -EFAULT; 2188 2189 tvps = ∝ 2190 2191 /* 2192 * Put an arbitrary limit on the number of messages that can 2193 * be sent at once 2194 */ 2195 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS)) 2196 return -EINVAL; 2197 2198 tvp = memdup_array_user(compat_ptr(tvps->props), 2199 tvps->num, sizeof(*tvp)); 2200 if (IS_ERR(tvp)) 2201 return PTR_ERR(tvp); 2202 2203 /* 2204 * Let's use our own copy of property cache, in order to 2205 * avoid mangling with DTV zigzag logic, as drivers might 2206 * return crap, if they don't check if the data is available 2207 * before updating the properties cache. 2208 */ 2209 if (fepriv->state != FESTATE_IDLE) { 2210 err = dtv_get_frontend(fe, &getp, NULL); 2211 if (err < 0) { 2212 kfree(tvp); 2213 return err; 2214 } 2215 } 2216 for (i = 0; i < tvps->num; i++) { 2217 err = dtv_property_process_get( 2218 fe, &getp, (struct dtv_property *)(tvp + i), file); 2219 if (err < 0) { 2220 kfree(tvp); 2221 return err; 2222 } 2223 } 2224 2225 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp, 2226 tvps->num * sizeof(struct compat_dtv_property))) { 2227 kfree(tvp); 2228 return -EFAULT; 2229 } 2230 kfree(tvp); 2231 } 2232 2233 return err; 2234} 2235 2236static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd, 2237 unsigned long arg) 2238{ 2239 struct dvb_device *dvbdev = file->private_data; 2240 struct dvb_frontend *fe = dvbdev->priv; 2241 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2242 int err; 2243 2244 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) { 2245 if (down_interruptible(&fepriv->sem)) 2246 return -ERESTARTSYS; 2247 2248 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg); 2249 2250 up(&fepriv->sem); 2251 return err; 2252 } 2253 2254 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 2255} 2256#endif 2257 2258static int dtv_set_frontend(struct dvb_frontend *fe) 2259{ 2260 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2261 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 2262 u32 rolloff = 0; 2263 2264 if (dvb_frontend_check_parameters(fe) < 0) 2265 return -EINVAL; 2266 2267 /* 2268 * Initialize output parameters to match the values given by 2269 * the user. FE_SET_FRONTEND triggers an initial frontend event 2270 * with status = 0, which copies output parameters to userspace. 2271 */ 2272 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out); 2273 2274 /* 2275 * Be sure that the bandwidth will be filled for all 2276 * non-satellite systems, as tuners need to know what 2277 * low pass/Nyquist half filter should be applied, in 2278 * order to avoid inter-channel noise. 2279 * 2280 * ISDB-T and DVB-T/T2 already sets bandwidth. 2281 * ATSC and DVB-C don't set, so, the core should fill it. 2282 * 2283 * On DVB-C Annex A and C, the bandwidth is a function of 2284 * the roll-off and symbol rate. Annex B defines different 2285 * roll-off factors depending on the modulation. Fortunately, 2286 * Annex B is only used with 6MHz, so there's no need to 2287 * calculate it. 2288 * 2289 * While not officially supported, a side effect of handling it at 2290 * the cache level is that a program could retrieve the bandwidth 2291 * via DTV_BANDWIDTH_HZ, which may be useful for test programs. 2292 */ 2293 switch (c->delivery_system) { 2294 case SYS_ATSC: 2295 case SYS_DVBC_ANNEX_B: 2296 c->bandwidth_hz = 6000000; 2297 break; 2298 case SYS_DVBC_ANNEX_A: 2299 rolloff = 115; 2300 break; 2301 case SYS_DVBC_ANNEX_C: 2302 rolloff = 113; 2303 break; 2304 case SYS_DSS: 2305 rolloff = 120; 2306 break; 2307 case SYS_DVBS: 2308 case SYS_TURBO: 2309 case SYS_ISDBS: 2310 rolloff = 135; 2311 break; 2312 case SYS_DVBS2: 2313 switch (c->rolloff) { 2314 case ROLLOFF_20: 2315 rolloff = 120; 2316 break; 2317 case ROLLOFF_25: 2318 rolloff = 125; 2319 break; 2320 default: 2321 case ROLLOFF_35: 2322 rolloff = 135; 2323 } 2324 break; 2325 default: 2326 break; 2327 } 2328 if (rolloff) 2329 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100); 2330 2331 /* force auto frequency inversion if requested */ 2332 if (dvb_force_auto_inversion) 2333 c->inversion = INVERSION_AUTO; 2334 2335 /* 2336 * without hierarchical coding code_rate_LP is irrelevant, 2337 * so we tolerate the otherwise invalid FEC_NONE setting 2338 */ 2339 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE) 2340 c->code_rate_LP = FEC_AUTO; 2341 2342 prepare_tuning_algo_parameters(fe); 2343 2344 fepriv->state = FESTATE_RETUNE; 2345 2346 /* Request the search algorithm to search */ 2347 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN; 2348 2349 dvb_frontend_clear_events(fe); 2350 dvb_frontend_add_event(fe, 0); 2351 dvb_frontend_wakeup(fe); 2352 fepriv->status = 0; 2353 2354 return 0; 2355} 2356 2357static int dvb_get_property(struct dvb_frontend *fe, struct file *file, 2358 struct dtv_properties *tvps) 2359{ 2360 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2361 struct dtv_property *tvp = NULL; 2362 struct dtv_frontend_properties getp; 2363 int i, err; 2364 2365 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp)); 2366 2367 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", 2368 __func__, tvps->num); 2369 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", 2370 __func__, tvps->props); 2371 2372 /* 2373 * Put an arbitrary limit on the number of messages that can 2374 * be sent at once 2375 */ 2376 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS) 2377 return -EINVAL; 2378 2379 tvp = memdup_array_user((void __user *)tvps->props, 2380 tvps->num, sizeof(*tvp)); 2381 if (IS_ERR(tvp)) 2382 return PTR_ERR(tvp); 2383 2384 /* 2385 * Let's use our own copy of property cache, in order to 2386 * avoid mangling with DTV zigzag logic, as drivers might 2387 * return crap, if they don't check if the data is available 2388 * before updating the properties cache. 2389 */ 2390 if (fepriv->state != FESTATE_IDLE) { 2391 err = dtv_get_frontend(fe, &getp, NULL); 2392 if (err < 0) 2393 goto out; 2394 } 2395 for (i = 0; i < tvps->num; i++) { 2396 err = dtv_property_process_get(fe, &getp, 2397 tvp + i, file); 2398 if (err < 0) 2399 goto out; 2400 } 2401 2402 if (copy_to_user((void __user *)tvps->props, tvp, 2403 tvps->num * sizeof(struct dtv_property))) { 2404 err = -EFAULT; 2405 goto out; 2406 } 2407 2408 err = 0; 2409out: 2410 kfree(tvp); 2411 return err; 2412} 2413 2414static int dvb_get_frontend(struct dvb_frontend *fe, 2415 struct dvb_frontend_parameters *p_out) 2416{ 2417 struct dtv_frontend_properties getp; 2418 2419 /* 2420 * Let's use our own copy of property cache, in order to 2421 * avoid mangling with DTV zigzag logic, as drivers might 2422 * return crap, if they don't check if the data is available 2423 * before updating the properties cache. 2424 */ 2425 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp)); 2426 2427 return dtv_get_frontend(fe, &getp, p_out); 2428} 2429 2430static int dvb_frontend_handle_ioctl(struct file *file, 2431 unsigned int cmd, void *parg) 2432{ 2433 struct dvb_device *dvbdev = file->private_data; 2434 struct dvb_frontend *fe = dvbdev->priv; 2435 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2436 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 2437 int i, err = -ENOTSUPP; 2438 2439 dev_dbg(fe->dvb->device, "%s:\n", __func__); 2440 2441 switch (cmd) { 2442 case FE_SET_PROPERTY: { 2443 struct dtv_properties *tvps = parg; 2444 struct dtv_property *tvp = NULL; 2445 2446 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n", 2447 __func__, tvps->num); 2448 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n", 2449 __func__, tvps->props); 2450 2451 /* 2452 * Put an arbitrary limit on the number of messages that can 2453 * be sent at once 2454 */ 2455 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS)) 2456 return -EINVAL; 2457 2458 tvp = memdup_array_user((void __user *)tvps->props, 2459 tvps->num, sizeof(*tvp)); 2460 if (IS_ERR(tvp)) 2461 return PTR_ERR(tvp); 2462 2463 for (i = 0; i < tvps->num; i++) { 2464 err = dtv_property_process_set(fe, file, 2465 (tvp + i)->cmd, 2466 (tvp + i)->u.data); 2467 if (err < 0) { 2468 kfree(tvp); 2469 return err; 2470 } 2471 } 2472 kfree(tvp); 2473 err = 0; 2474 break; 2475 } 2476 case FE_GET_PROPERTY: 2477 err = dvb_get_property(fe, file, parg); 2478 break; 2479 2480 case FE_GET_INFO: { 2481 struct dvb_frontend_info *info = parg; 2482 memset(info, 0, sizeof(*info)); 2483 2484 strscpy(info->name, fe->ops.info.name, sizeof(info->name)); 2485 info->symbol_rate_min = fe->ops.info.symbol_rate_min; 2486 info->symbol_rate_max = fe->ops.info.symbol_rate_max; 2487 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance; 2488 info->caps = fe->ops.info.caps; 2489 info->frequency_stepsize = dvb_frontend_get_stepsize(fe); 2490 dvb_frontend_get_frequency_limits(fe, &info->frequency_min, 2491 &info->frequency_max, 2492 &info->frequency_tolerance); 2493 2494 /* 2495 * Associate the 4 delivery systems supported by DVBv3 2496 * API with their DVBv5 counterpart. For the other standards, 2497 * use the closest type, assuming that it would hopefully 2498 * work with a DVBv3 application. 2499 * It should be noticed that, on multi-frontend devices with 2500 * different types (terrestrial and cable, for example), 2501 * a pure DVBv3 application won't be able to use all delivery 2502 * systems. Yet, changing the DVBv5 cache to the other delivery 2503 * system should be enough for making it work. 2504 */ 2505 switch (dvbv3_type(c->delivery_system)) { 2506 case DVBV3_QPSK: 2507 info->type = FE_QPSK; 2508 break; 2509 case DVBV3_ATSC: 2510 info->type = FE_ATSC; 2511 break; 2512 case DVBV3_QAM: 2513 info->type = FE_QAM; 2514 break; 2515 case DVBV3_OFDM: 2516 info->type = FE_OFDM; 2517 break; 2518 default: 2519 dev_err(fe->dvb->device, 2520 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n", 2521 __func__, c->delivery_system); 2522 info->type = FE_OFDM; 2523 } 2524 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n", 2525 __func__, c->delivery_system, info->type); 2526 2527 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */ 2528 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) 2529 info->caps |= FE_CAN_INVERSION_AUTO; 2530 err = 0; 2531 break; 2532 } 2533 2534 case FE_READ_STATUS: { 2535 enum fe_status *status = parg; 2536 2537 /* if retune was requested but hasn't occurred yet, prevent 2538 * that user get signal state from previous tuning */ 2539 if (fepriv->state == FESTATE_RETUNE || 2540 fepriv->state == FESTATE_ERROR) { 2541 err = 0; 2542 *status = 0; 2543 break; 2544 } 2545 2546 if (fe->ops.read_status) 2547 err = fe->ops.read_status(fe, status); 2548 break; 2549 } 2550 2551 case FE_DISEQC_RESET_OVERLOAD: 2552 if (fe->ops.diseqc_reset_overload) { 2553 err = fe->ops.diseqc_reset_overload(fe); 2554 fepriv->state = FESTATE_DISEQC; 2555 fepriv->status = 0; 2556 } 2557 break; 2558 2559 case FE_DISEQC_SEND_MASTER_CMD: 2560 if (fe->ops.diseqc_send_master_cmd) { 2561 struct dvb_diseqc_master_cmd *cmd = parg; 2562 2563 if (cmd->msg_len > sizeof(cmd->msg)) { 2564 err = -EINVAL; 2565 break; 2566 } 2567 err = fe->ops.diseqc_send_master_cmd(fe, cmd); 2568 fepriv->state = FESTATE_DISEQC; 2569 fepriv->status = 0; 2570 } 2571 break; 2572 2573 case FE_DISEQC_SEND_BURST: 2574 if (fe->ops.diseqc_send_burst) { 2575 err = fe->ops.diseqc_send_burst(fe, (long)parg); 2576 fepriv->state = FESTATE_DISEQC; 2577 fepriv->status = 0; 2578 } 2579 break; 2580 2581 case FE_SET_TONE: 2582 if (fe->ops.set_tone) { 2583 fepriv->tone = (long)parg; 2584 err = fe->ops.set_tone(fe, fepriv->tone); 2585 fepriv->state = FESTATE_DISEQC; 2586 fepriv->status = 0; 2587 } 2588 break; 2589 2590 case FE_SET_VOLTAGE: 2591 if (fe->ops.set_voltage) { 2592 fepriv->voltage = (long)parg; 2593 err = fe->ops.set_voltage(fe, fepriv->voltage); 2594 fepriv->state = FESTATE_DISEQC; 2595 fepriv->status = 0; 2596 } 2597 break; 2598 2599 case FE_DISEQC_RECV_SLAVE_REPLY: 2600 if (fe->ops.diseqc_recv_slave_reply) 2601 err = fe->ops.diseqc_recv_slave_reply(fe, parg); 2602 break; 2603 2604 case FE_ENABLE_HIGH_LNB_VOLTAGE: 2605 if (fe->ops.enable_high_lnb_voltage) 2606 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg); 2607 break; 2608 2609 case FE_SET_FRONTEND_TUNE_MODE: 2610 fepriv->tune_mode_flags = (unsigned long)parg; 2611 err = 0; 2612 break; 2613 /* DEPRECATED dish control ioctls */ 2614 2615 case FE_DISHNETWORK_SEND_LEGACY_CMD: 2616 if (fe->ops.dishnetwork_send_legacy_command) { 2617 err = fe->ops.dishnetwork_send_legacy_command(fe, 2618 (unsigned long)parg); 2619 fepriv->state = FESTATE_DISEQC; 2620 fepriv->status = 0; 2621 } else if (fe->ops.set_voltage) { 2622 /* 2623 * NOTE: This is a fallback condition. Some frontends 2624 * (stv0299 for instance) take longer than 8msec to 2625 * respond to a set_voltage command. Those switches 2626 * need custom routines to switch properly. For all 2627 * other frontends, the following should work ok. 2628 * Dish network legacy switches (as used by Dish500) 2629 * are controlled by sending 9-bit command words 2630 * spaced 8msec apart. 2631 * the actual command word is switch/port dependent 2632 * so it is up to the userspace application to send 2633 * the right command. 2634 * The command must always start with a '0' after 2635 * initialization, so parg is 8 bits and does not 2636 * include the initialization or start bit 2637 */ 2638 unsigned long swcmd = ((unsigned long)parg) << 1; 2639 ktime_t nexttime; 2640 ktime_t tv[10]; 2641 int i; 2642 u8 last = 1; 2643 2644 if (dvb_frontend_debug) 2645 dprintk("switch command: 0x%04lx\n", 2646 swcmd); 2647 nexttime = ktime_get_boottime(); 2648 if (dvb_frontend_debug) 2649 tv[0] = nexttime; 2650 /* before sending a command, initialize by sending 2651 * a 32ms 18V to the switch 2652 */ 2653 fe->ops.set_voltage(fe, SEC_VOLTAGE_18); 2654 dvb_frontend_sleep_until(&nexttime, 32000); 2655 2656 for (i = 0; i < 9; i++) { 2657 if (dvb_frontend_debug) 2658 tv[i + 1] = ktime_get_boottime(); 2659 if ((swcmd & 0x01) != last) { 2660 /* set voltage to (last ? 13V : 18V) */ 2661 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); 2662 last = (last) ? 0 : 1; 2663 } 2664 swcmd = swcmd >> 1; 2665 if (i != 8) 2666 dvb_frontend_sleep_until(&nexttime, 8000); 2667 } 2668 if (dvb_frontend_debug) { 2669 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n", 2670 fe->dvb->num); 2671 for (i = 1; i < 10; i++) 2672 pr_info("%d: %d\n", i, 2673 (int)ktime_us_delta(tv[i], tv[i - 1])); 2674 } 2675 err = 0; 2676 fepriv->state = FESTATE_DISEQC; 2677 fepriv->status = 0; 2678 } 2679 break; 2680 2681 /* DEPRECATED statistics ioctls */ 2682 2683 case FE_READ_BER: 2684 if (fe->ops.read_ber) { 2685 if (fepriv->thread) 2686 err = fe->ops.read_ber(fe, parg); 2687 else 2688 err = -EAGAIN; 2689 } 2690 break; 2691 2692 case FE_READ_SIGNAL_STRENGTH: 2693 if (fe->ops.read_signal_strength) { 2694 if (fepriv->thread) 2695 err = fe->ops.read_signal_strength(fe, parg); 2696 else 2697 err = -EAGAIN; 2698 } 2699 break; 2700 2701 case FE_READ_SNR: 2702 if (fe->ops.read_snr) { 2703 if (fepriv->thread) 2704 err = fe->ops.read_snr(fe, parg); 2705 else 2706 err = -EAGAIN; 2707 } 2708 break; 2709 2710 case FE_READ_UNCORRECTED_BLOCKS: 2711 if (fe->ops.read_ucblocks) { 2712 if (fepriv->thread) 2713 err = fe->ops.read_ucblocks(fe, parg); 2714 else 2715 err = -EAGAIN; 2716 } 2717 break; 2718 2719 /* DEPRECATED DVBv3 ioctls */ 2720 2721 case FE_SET_FRONTEND: 2722 err = dvbv3_set_delivery_system(fe); 2723 if (err) 2724 break; 2725 2726 err = dtv_property_cache_sync(fe, c, parg); 2727 if (err) 2728 break; 2729 err = dtv_set_frontend(fe); 2730 break; 2731 2732 case FE_GET_EVENT: 2733 err = dvb_frontend_get_event(fe, parg, file->f_flags); 2734 break; 2735 2736 case FE_GET_FRONTEND: 2737 err = dvb_get_frontend(fe, parg); 2738 break; 2739 2740 default: 2741 return -ENOTSUPP; 2742 } /* switch */ 2743 2744 return err; 2745} 2746 2747static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) 2748{ 2749 struct dvb_device *dvbdev = file->private_data; 2750 struct dvb_frontend *fe = dvbdev->priv; 2751 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2752 2753 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__); 2754 2755 poll_wait(file, &fepriv->events.wait_queue, wait); 2756 2757 if (fepriv->events.eventw != fepriv->events.eventr) 2758 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI); 2759 2760 return 0; 2761} 2762 2763static int dvb_frontend_open(struct inode *inode, struct file *file) 2764{ 2765 struct dvb_device *dvbdev = file->private_data; 2766 struct dvb_frontend *fe = dvbdev->priv; 2767 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2768 struct dvb_adapter *adapter = fe->dvb; 2769 int ret; 2770 2771 dev_dbg(fe->dvb->device, "%s:\n", __func__); 2772 if (fe->exit == DVB_FE_DEVICE_REMOVED) 2773 return -ENODEV; 2774 2775 if (adapter->mfe_shared == 2) { 2776 mutex_lock(&adapter->mfe_lock); 2777 if ((file->f_flags & O_ACCMODE) != O_RDONLY) { 2778 if (adapter->mfe_dvbdev && 2779 !adapter->mfe_dvbdev->writers) { 2780 mutex_unlock(&adapter->mfe_lock); 2781 return -EBUSY; 2782 } 2783 adapter->mfe_dvbdev = dvbdev; 2784 } 2785 } else if (adapter->mfe_shared) { 2786 mutex_lock(&adapter->mfe_lock); 2787 2788 if (!adapter->mfe_dvbdev) 2789 adapter->mfe_dvbdev = dvbdev; 2790 2791 else if (adapter->mfe_dvbdev != dvbdev) { 2792 struct dvb_device 2793 *mfedev = adapter->mfe_dvbdev; 2794 struct dvb_frontend 2795 *mfe = mfedev->priv; 2796 struct dvb_frontend_private 2797 *mfepriv = mfe->frontend_priv; 2798 int mferetry = (dvb_mfe_wait_time << 1); 2799 2800 mutex_unlock(&adapter->mfe_lock); 2801 while (mferetry-- && (mfedev->users != -1 || 2802 mfepriv->thread)) { 2803 if (msleep_interruptible(500)) { 2804 if (signal_pending(current)) 2805 return -EINTR; 2806 } 2807 } 2808 2809 mutex_lock(&adapter->mfe_lock); 2810 if (adapter->mfe_dvbdev != dvbdev) { 2811 mfedev = adapter->mfe_dvbdev; 2812 mfe = mfedev->priv; 2813 mfepriv = mfe->frontend_priv; 2814 if (mfedev->users != -1 || 2815 mfepriv->thread) { 2816 mutex_unlock(&adapter->mfe_lock); 2817 return -EBUSY; 2818 } 2819 adapter->mfe_dvbdev = dvbdev; 2820 } 2821 } 2822 } 2823 2824 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) { 2825 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0) 2826 goto err0; 2827 2828 /* If we took control of the bus, we need to force 2829 reinitialization. This is because many ts_bus_ctrl() 2830 functions strobe the RESET pin on the demod, and if the 2831 frontend thread already exists then the dvb_init() routine 2832 won't get called (which is what usually does initial 2833 register configuration). */ 2834 fepriv->reinitialise = 1; 2835 } 2836 2837 if ((ret = dvb_generic_open(inode, file)) < 0) 2838 goto err1; 2839 2840 if ((file->f_flags & O_ACCMODE) != O_RDONLY) { 2841 /* normal tune mode when opened R/W */ 2842 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT; 2843 fepriv->tone = -1; 2844 fepriv->voltage = -1; 2845 2846#ifdef CONFIG_MEDIA_CONTROLLER_DVB 2847 mutex_lock(&fe->dvb->mdev_lock); 2848 if (fe->dvb->mdev) { 2849 mutex_lock(&fe->dvb->mdev->graph_mutex); 2850 if (fe->dvb->mdev->enable_source) 2851 ret = fe->dvb->mdev->enable_source( 2852 dvbdev->entity, 2853 &fepriv->pipe); 2854 mutex_unlock(&fe->dvb->mdev->graph_mutex); 2855 if (ret) { 2856 mutex_unlock(&fe->dvb->mdev_lock); 2857 dev_err(fe->dvb->device, 2858 "Tuner is busy. Error %d\n", ret); 2859 goto err2; 2860 } 2861 } 2862 mutex_unlock(&fe->dvb->mdev_lock); 2863#endif 2864 ret = dvb_frontend_start(fe); 2865 if (ret) 2866 goto err3; 2867 2868 /* empty event queue */ 2869 fepriv->events.eventr = fepriv->events.eventw = 0; 2870 } 2871 2872 dvb_frontend_get(fe); 2873 2874 if (adapter->mfe_shared) 2875 mutex_unlock(&adapter->mfe_lock); 2876 return ret; 2877 2878err3: 2879#ifdef CONFIG_MEDIA_CONTROLLER_DVB 2880 mutex_lock(&fe->dvb->mdev_lock); 2881 if (fe->dvb->mdev) { 2882 mutex_lock(&fe->dvb->mdev->graph_mutex); 2883 if (fe->dvb->mdev->disable_source) 2884 fe->dvb->mdev->disable_source(dvbdev->entity); 2885 mutex_unlock(&fe->dvb->mdev->graph_mutex); 2886 } 2887 mutex_unlock(&fe->dvb->mdev_lock); 2888err2: 2889#endif 2890 dvb_generic_release(inode, file); 2891err1: 2892 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) 2893 fe->ops.ts_bus_ctrl(fe, 0); 2894err0: 2895 if (adapter->mfe_shared) 2896 mutex_unlock(&adapter->mfe_lock); 2897 return ret; 2898} 2899 2900static int dvb_frontend_release(struct inode *inode, struct file *file) 2901{ 2902 struct dvb_device *dvbdev = file->private_data; 2903 struct dvb_frontend *fe = dvbdev->priv; 2904 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2905 int ret; 2906 2907 dev_dbg(fe->dvb->device, "%s:\n", __func__); 2908 2909 if ((file->f_flags & O_ACCMODE) != O_RDONLY) { 2910 fepriv->release_jiffies = jiffies; 2911 mb(); 2912 } 2913 2914 ret = dvb_generic_release(inode, file); 2915 2916 if (dvbdev->users == -1) { 2917 wake_up(&fepriv->wait_queue); 2918#ifdef CONFIG_MEDIA_CONTROLLER_DVB 2919 mutex_lock(&fe->dvb->mdev_lock); 2920 if (fe->dvb->mdev) { 2921 mutex_lock(&fe->dvb->mdev->graph_mutex); 2922 if (fe->dvb->mdev->disable_source) 2923 fe->dvb->mdev->disable_source(dvbdev->entity); 2924 mutex_unlock(&fe->dvb->mdev->graph_mutex); 2925 } 2926 mutex_unlock(&fe->dvb->mdev_lock); 2927#endif 2928 if (fe->exit != DVB_FE_NO_EXIT) 2929 wake_up(&dvbdev->wait_queue); 2930 if (fe->ops.ts_bus_ctrl) 2931 fe->ops.ts_bus_ctrl(fe, 0); 2932 } 2933 2934 dvb_frontend_put(fe); 2935 2936 return ret; 2937} 2938 2939static const struct file_operations dvb_frontend_fops = { 2940 .owner = THIS_MODULE, 2941 .unlocked_ioctl = dvb_frontend_ioctl, 2942#ifdef CONFIG_COMPAT 2943 .compat_ioctl = dvb_frontend_compat_ioctl, 2944#endif 2945 .poll = dvb_frontend_poll, 2946 .open = dvb_frontend_open, 2947 .release = dvb_frontend_release, 2948 .llseek = noop_llseek, 2949}; 2950 2951int dvb_frontend_suspend(struct dvb_frontend *fe) 2952{ 2953 int ret = 0; 2954 2955 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num, 2956 fe->id); 2957 2958 if (fe->ops.tuner_ops.suspend) 2959 ret = fe->ops.tuner_ops.suspend(fe); 2960 else if (fe->ops.tuner_ops.sleep) 2961 ret = fe->ops.tuner_ops.sleep(fe); 2962 2963 if (fe->ops.suspend) 2964 ret = fe->ops.suspend(fe); 2965 else if (fe->ops.sleep) 2966 ret = fe->ops.sleep(fe); 2967 2968 return ret; 2969} 2970EXPORT_SYMBOL(dvb_frontend_suspend); 2971 2972int dvb_frontend_resume(struct dvb_frontend *fe) 2973{ 2974 struct dvb_frontend_private *fepriv = fe->frontend_priv; 2975 int ret = 0; 2976 2977 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num, 2978 fe->id); 2979 2980 fe->exit = DVB_FE_DEVICE_RESUME; 2981 if (fe->ops.resume) 2982 ret = fe->ops.resume(fe); 2983 else if (fe->ops.init) 2984 ret = fe->ops.init(fe); 2985 2986 if (fe->ops.tuner_ops.resume) 2987 ret = fe->ops.tuner_ops.resume(fe); 2988 else if (fe->ops.tuner_ops.init) 2989 ret = fe->ops.tuner_ops.init(fe); 2990 2991 if (fe->ops.set_tone && fepriv->tone != -1) 2992 fe->ops.set_tone(fe, fepriv->tone); 2993 if (fe->ops.set_voltage && fepriv->voltage != -1) 2994 fe->ops.set_voltage(fe, fepriv->voltage); 2995 2996 fe->exit = DVB_FE_NO_EXIT; 2997 fepriv->state = FESTATE_RETUNE; 2998 dvb_frontend_wakeup(fe); 2999 3000 return ret; 3001} 3002EXPORT_SYMBOL(dvb_frontend_resume); 3003 3004int dvb_register_frontend(struct dvb_adapter *dvb, 3005 struct dvb_frontend *fe) 3006{ 3007 struct dvb_frontend_private *fepriv; 3008 const struct dvb_device dvbdev_template = { 3009 .users = ~0, 3010 .writers = 1, 3011 .readers = (~0) - 1, 3012 .fops = &dvb_frontend_fops, 3013#if defined(CONFIG_MEDIA_CONTROLLER_DVB) 3014 .name = fe->ops.info.name, 3015#endif 3016 }; 3017 int ret; 3018 3019 dev_dbg(dvb->device, "%s:\n", __func__); 3020 3021 if (mutex_lock_interruptible(&frontend_mutex)) 3022 return -ERESTARTSYS; 3023 3024 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); 3025 if (!fe->frontend_priv) { 3026 mutex_unlock(&frontend_mutex); 3027 return -ENOMEM; 3028 } 3029 fepriv = fe->frontend_priv; 3030 3031 kref_init(&fe->refcount); 3032 3033 /* 3034 * After initialization, there need to be two references: one 3035 * for dvb_unregister_frontend(), and another one for 3036 * dvb_frontend_detach(). 3037 */ 3038 dvb_frontend_get(fe); 3039 3040 sema_init(&fepriv->sem, 1); 3041 init_waitqueue_head(&fepriv->wait_queue); 3042 init_waitqueue_head(&fepriv->events.wait_queue); 3043 mutex_init(&fepriv->events.mtx); 3044 fe->dvb = dvb; 3045 fepriv->inversion = INVERSION_OFF; 3046 3047 dev_info(fe->dvb->device, 3048 "DVB: registering adapter %i frontend %i (%s)...\n", 3049 fe->dvb->num, fe->id, fe->ops.info.name); 3050 3051 ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template, 3052 fe, DVB_DEVICE_FRONTEND, 0); 3053 if (ret) { 3054 dvb_frontend_put(fe); 3055 mutex_unlock(&frontend_mutex); 3056 return ret; 3057 } 3058 3059 /* 3060 * Initialize the cache to the proper values according with the 3061 * first supported delivery system (ops->delsys[0]) 3062 */ 3063 3064 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0]; 3065 dvb_frontend_clear_cache(fe); 3066 3067 mutex_unlock(&frontend_mutex); 3068 return 0; 3069} 3070EXPORT_SYMBOL(dvb_register_frontend); 3071 3072int dvb_unregister_frontend(struct dvb_frontend *fe) 3073{ 3074 struct dvb_frontend_private *fepriv = fe->frontend_priv; 3075 3076 dev_dbg(fe->dvb->device, "%s:\n", __func__); 3077 3078 mutex_lock(&frontend_mutex); 3079 dvb_frontend_stop(fe); 3080 dvb_remove_device(fepriv->dvbdev); 3081 3082 /* fe is invalid now */ 3083 mutex_unlock(&frontend_mutex); 3084 dvb_frontend_put(fe); 3085 return 0; 3086} 3087EXPORT_SYMBOL(dvb_unregister_frontend); 3088 3089static void dvb_frontend_invoke_release(struct dvb_frontend *fe, 3090 void (*release)(struct dvb_frontend *fe)) 3091{ 3092 if (release) { 3093 release(fe); 3094#ifdef CONFIG_MEDIA_ATTACH 3095 dvb_detach(release); 3096#endif 3097 } 3098} 3099 3100void dvb_frontend_detach(struct dvb_frontend *fe) 3101{ 3102 dvb_frontend_invoke_release(fe, fe->ops.release_sec); 3103 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release); 3104 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release); 3105 dvb_frontend_put(fe); 3106} 3107EXPORT_SYMBOL(dvb_frontend_detach); 3108