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/list.h>
27 #include <linux/freezer.h>
28 #include <linux/jiffies.h>
29 #include <linux/kthread.h>
30 #include <linux/ktime.h>
31 #include <linux/compat.h>
32 #include <asm/processor.h>
33
34 #include <media/dvb_frontend.h>
35 #include <media/dvbdev.h>
36 #include <linux/dvb/version.h>
37
38 static int dvb_frontend_debug;
39 static int dvb_shutdown_timeout;
40 static int dvb_force_auto_inversion;
41 static int dvb_override_tune_delay;
42 static int dvb_powerdown_on_sleep = 1;
43 static int dvb_mfe_wait_time = 5;
44
45 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
46 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
47 module_param(dvb_shutdown_timeout, int, 0644);
48 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
49 module_param(dvb_force_auto_inversion, int, 0644);
50 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
51 module_param(dvb_override_tune_delay, int, 0644);
52 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
53 module_param(dvb_powerdown_on_sleep, int, 0644);
54 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
55 module_param(dvb_mfe_wait_time, int, 0644);
56 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
57
58 #define dprintk(fmt, arg...) \
59 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
60
61 #define FESTATE_IDLE 1
62 #define FESTATE_RETUNE 2
63 #define FESTATE_TUNING_FAST 4
64 #define FESTATE_TUNING_SLOW 8
65 #define FESTATE_TUNED 16
66 #define FESTATE_ZIGZAG_FAST 32
67 #define FESTATE_ZIGZAG_SLOW 64
68 #define FESTATE_DISEQC 128
69 #define FESTATE_ERROR 256
70 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
71 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
72 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
73 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
74
75 /*
76 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
77 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
78 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
79 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
80 * FESTATE_TUNED. The frontend has successfully locked on.
81 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
82 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
83 * FESTATE_DISEQC. A DISEQC command has just been issued.
84 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
85 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
86 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
87 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
88 */
89
90 static DEFINE_MUTEX(frontend_mutex);
91
92 struct dvb_frontend_private {
93 /* thread/frontend values */
94 struct dvb_device *dvbdev;
95 struct dvb_frontend_parameters parameters_out;
96 struct dvb_fe_events events;
97 struct semaphore sem;
98 struct list_head list_head;
99 wait_queue_head_t wait_queue;
100 struct task_struct *thread;
101 unsigned long release_jiffies;
102 unsigned int wakeup;
103 enum fe_status status;
104 unsigned long tune_mode_flags;
105 unsigned int delay;
106 unsigned int reinitialise;
107 int tone;
108 int voltage;
109
110 /* swzigzag values */
111 unsigned int state;
112 unsigned int bending;
113 int lnb_drift;
114 unsigned int inversion;
115 unsigned int auto_step;
116 unsigned int auto_sub_step;
117 unsigned int started_auto_step;
118 unsigned int min_delay;
119 unsigned int max_drift;
120 unsigned int step_size;
121 int quality;
122 unsigned int check_wrapped;
123 enum dvbfe_search algo_status;
124
125 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
126 struct media_pipeline pipe;
127 #endif
128 };
129
130 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
131 void (*release)(struct dvb_frontend *fe));
132
__dvb_frontend_free(struct dvb_frontend * fe)133 static void __dvb_frontend_free(struct dvb_frontend *fe)
134 {
135 struct dvb_frontend_private *fepriv = fe->frontend_priv;
136
137 if (fepriv)
138 dvb_free_device(fepriv->dvbdev);
139
140 dvb_frontend_invoke_release(fe, fe->ops.release);
141
142 kfree(fepriv);
143 }
144
dvb_frontend_free(struct kref * ref)145 static void dvb_frontend_free(struct kref *ref)
146 {
147 struct dvb_frontend *fe =
148 container_of(ref, struct dvb_frontend, refcount);
149
150 __dvb_frontend_free(fe);
151 }
152
dvb_frontend_put(struct dvb_frontend * fe)153 static void dvb_frontend_put(struct dvb_frontend *fe)
154 {
155 /* call detach before dropping the reference count */
156 if (fe->ops.detach)
157 fe->ops.detach(fe);
158 /*
159 * Check if the frontend was registered, as otherwise
160 * kref was not initialized yet.
161 */
162 if (fe->frontend_priv)
163 kref_put(&fe->refcount, dvb_frontend_free);
164 else
165 __dvb_frontend_free(fe);
166 }
167
dvb_frontend_get(struct dvb_frontend * fe)168 static void dvb_frontend_get(struct dvb_frontend *fe)
169 {
170 kref_get(&fe->refcount);
171 }
172
173 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
174 static int dtv_get_frontend(struct dvb_frontend *fe,
175 struct dtv_frontend_properties *c,
176 struct dvb_frontend_parameters *p_out);
177 static int
178 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
179 const struct dtv_frontend_properties *c,
180 struct dvb_frontend_parameters *p);
181
has_get_frontend(struct dvb_frontend * fe)182 static bool has_get_frontend(struct dvb_frontend *fe)
183 {
184 return fe->ops.get_frontend;
185 }
186
187 /*
188 * Due to DVBv3 API calls, a delivery system should be mapped into one of
189 * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
190 * otherwise, a DVBv3 call will fail.
191 */
192 enum dvbv3_emulation_type {
193 DVBV3_UNKNOWN,
194 DVBV3_QPSK,
195 DVBV3_QAM,
196 DVBV3_OFDM,
197 DVBV3_ATSC,
198 };
199
dvbv3_type(u32 delivery_system)200 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
201 {
202 switch (delivery_system) {
203 case SYS_DVBC_ANNEX_A:
204 case SYS_DVBC_ANNEX_C:
205 return DVBV3_QAM;
206 case SYS_DVBS:
207 case SYS_DVBS2:
208 case SYS_TURBO:
209 case SYS_ISDBS:
210 case SYS_DSS:
211 return DVBV3_QPSK;
212 case SYS_DVBT:
213 case SYS_DVBT2:
214 case SYS_ISDBT:
215 case SYS_DTMB:
216 return DVBV3_OFDM;
217 case SYS_ATSC:
218 case SYS_ATSCMH:
219 case SYS_DVBC_ANNEX_B:
220 return DVBV3_ATSC;
221 case SYS_UNDEFINED:
222 case SYS_ISDBC:
223 case SYS_DVBH:
224 case SYS_DAB:
225 default:
226 /*
227 * Doesn't know how to emulate those types and/or
228 * there's no frontend driver from this type yet
229 * with some emulation code, so, we're not sure yet how
230 * to handle them, or they're not compatible with a DVBv3 call.
231 */
232 return DVBV3_UNKNOWN;
233 }
234 }
235
dvb_frontend_add_event(struct dvb_frontend * fe,enum fe_status status)236 static void dvb_frontend_add_event(struct dvb_frontend *fe,
237 enum fe_status status)
238 {
239 struct dvb_frontend_private *fepriv = fe->frontend_priv;
240 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
241 struct dvb_fe_events *events = &fepriv->events;
242 struct dvb_frontend_event *e;
243 int wp;
244
245 dev_dbg(fe->dvb->device, "%s:\n", __func__);
246
247 if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
248 dtv_get_frontend(fe, c, &fepriv->parameters_out);
249
250 mutex_lock(&events->mtx);
251
252 wp = (events->eventw + 1) % MAX_EVENT;
253 if (wp == events->eventr) {
254 events->overflow = 1;
255 events->eventr = (events->eventr + 1) % MAX_EVENT;
256 }
257
258 e = &events->events[events->eventw];
259 e->status = status;
260 e->parameters = fepriv->parameters_out;
261
262 events->eventw = wp;
263
264 mutex_unlock(&events->mtx);
265
266 wake_up_interruptible(&events->wait_queue);
267 }
268
dvb_frontend_test_event(struct dvb_frontend_private * fepriv,struct dvb_fe_events * events)269 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
270 struct dvb_fe_events *events)
271 {
272 int ret;
273
274 up(&fepriv->sem);
275 ret = events->eventw != events->eventr;
276 down(&fepriv->sem);
277
278 return ret;
279 }
280
dvb_frontend_get_event(struct dvb_frontend * fe,struct dvb_frontend_event * event,int flags)281 static int dvb_frontend_get_event(struct dvb_frontend *fe,
282 struct dvb_frontend_event *event, int flags)
283 {
284 struct dvb_frontend_private *fepriv = fe->frontend_priv;
285 struct dvb_fe_events *events = &fepriv->events;
286
287 dev_dbg(fe->dvb->device, "%s:\n", __func__);
288
289 if (events->overflow) {
290 events->overflow = 0;
291 return -EOVERFLOW;
292 }
293
294 if (events->eventw == events->eventr) {
295 int ret;
296
297 if (flags & O_NONBLOCK)
298 return -EWOULDBLOCK;
299
300 ret = wait_event_interruptible(events->wait_queue,
301 dvb_frontend_test_event(fepriv, events));
302
303 if (ret < 0)
304 return ret;
305 }
306
307 mutex_lock(&events->mtx);
308 *event = events->events[events->eventr];
309 events->eventr = (events->eventr + 1) % MAX_EVENT;
310 mutex_unlock(&events->mtx);
311
312 return 0;
313 }
314
dvb_frontend_clear_events(struct dvb_frontend * fe)315 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
316 {
317 struct dvb_frontend_private *fepriv = fe->frontend_priv;
318 struct dvb_fe_events *events = &fepriv->events;
319
320 mutex_lock(&events->mtx);
321 events->eventr = events->eventw;
322 mutex_unlock(&events->mtx);
323 }
324
dvb_frontend_init(struct dvb_frontend * fe)325 static void dvb_frontend_init(struct dvb_frontend *fe)
326 {
327 dev_dbg(fe->dvb->device,
328 "%s: initialising adapter %i frontend %i (%s)...\n",
329 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
330
331 if (fe->ops.init)
332 fe->ops.init(fe);
333 if (fe->ops.tuner_ops.init) {
334 if (fe->ops.i2c_gate_ctrl)
335 fe->ops.i2c_gate_ctrl(fe, 1);
336 fe->ops.tuner_ops.init(fe);
337 if (fe->ops.i2c_gate_ctrl)
338 fe->ops.i2c_gate_ctrl(fe, 0);
339 }
340 }
341
dvb_frontend_reinitialise(struct dvb_frontend * fe)342 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
343 {
344 struct dvb_frontend_private *fepriv = fe->frontend_priv;
345
346 fepriv->reinitialise = 1;
347 dvb_frontend_wakeup(fe);
348 }
349 EXPORT_SYMBOL(dvb_frontend_reinitialise);
350
dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private * fepriv,int locked)351 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
352 {
353 int q2;
354 struct dvb_frontend *fe = fepriv->dvbdev->priv;
355
356 dev_dbg(fe->dvb->device, "%s:\n", __func__);
357
358 if (locked)
359 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
360 else
361 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
362
363 q2 = fepriv->quality - 128;
364 q2 *= q2;
365
366 fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
367 }
368
369 /**
370 * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
371 * parameters.
372 *
373 * @fe: The frontend concerned.
374 * @check_wrapped: Checks if an iteration has completed.
375 * DO NOT SET ON THE FIRST ATTEMPT.
376 *
377 * return: Number of complete iterations that have been performed.
378 */
dvb_frontend_swzigzag_autotune(struct dvb_frontend * fe,int check_wrapped)379 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
380 {
381 int autoinversion;
382 int ready = 0;
383 int fe_set_err = 0;
384 struct dvb_frontend_private *fepriv = fe->frontend_priv;
385 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
386 int original_inversion = c->inversion;
387 u32 original_frequency = c->frequency;
388
389 /* are we using autoinversion? */
390 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
391 (c->inversion == INVERSION_AUTO));
392
393 /* setup parameters correctly */
394 while (!ready) {
395 /* calculate the lnb_drift */
396 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
397
398 /* wrap the auto_step if we've exceeded the maximum drift */
399 if (fepriv->lnb_drift > fepriv->max_drift) {
400 fepriv->auto_step = 0;
401 fepriv->auto_sub_step = 0;
402 fepriv->lnb_drift = 0;
403 }
404
405 /* perform inversion and +/- zigzag */
406 switch (fepriv->auto_sub_step) {
407 case 0:
408 /* try with the current inversion and current drift setting */
409 ready = 1;
410 break;
411
412 case 1:
413 if (!autoinversion) break;
414
415 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
416 ready = 1;
417 break;
418
419 case 2:
420 if (fepriv->lnb_drift == 0) break;
421
422 fepriv->lnb_drift = -fepriv->lnb_drift;
423 ready = 1;
424 break;
425
426 case 3:
427 if (fepriv->lnb_drift == 0) break;
428 if (!autoinversion) break;
429
430 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
431 fepriv->lnb_drift = -fepriv->lnb_drift;
432 ready = 1;
433 break;
434
435 default:
436 fepriv->auto_step++;
437 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
438 break;
439 }
440
441 if (!ready) fepriv->auto_sub_step++;
442 }
443
444 /* if this attempt would hit where we started, indicate a complete
445 * iteration has occurred */
446 if ((fepriv->auto_step == fepriv->started_auto_step) &&
447 (fepriv->auto_sub_step == 0) && check_wrapped) {
448 return 1;
449 }
450
451 dev_dbg(fe->dvb->device,
452 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
453 __func__, fepriv->lnb_drift, fepriv->inversion,
454 fepriv->auto_step, fepriv->auto_sub_step,
455 fepriv->started_auto_step);
456
457 /* set the frontend itself */
458 c->frequency += fepriv->lnb_drift;
459 if (autoinversion)
460 c->inversion = fepriv->inversion;
461 tmp = *c;
462 if (fe->ops.set_frontend)
463 fe_set_err = fe->ops.set_frontend(fe);
464 *c = tmp;
465 if (fe_set_err < 0) {
466 fepriv->state = FESTATE_ERROR;
467 return fe_set_err;
468 }
469
470 c->frequency = original_frequency;
471 c->inversion = original_inversion;
472
473 fepriv->auto_sub_step++;
474 return 0;
475 }
476
dvb_frontend_swzigzag(struct dvb_frontend * fe)477 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
478 {
479 enum fe_status s = FE_NONE;
480 int retval = 0;
481 struct dvb_frontend_private *fepriv = fe->frontend_priv;
482 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
483
484 /* if we've got no parameters, just keep idling */
485 if (fepriv->state & FESTATE_IDLE) {
486 fepriv->delay = 3 * HZ;
487 fepriv->quality = 0;
488 return;
489 }
490
491 /* in SCAN mode, we just set the frontend when asked and leave it alone */
492 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
493 if (fepriv->state & FESTATE_RETUNE) {
494 tmp = *c;
495 if (fe->ops.set_frontend)
496 retval = fe->ops.set_frontend(fe);
497 *c = tmp;
498 if (retval < 0)
499 fepriv->state = FESTATE_ERROR;
500 else
501 fepriv->state = FESTATE_TUNED;
502 }
503 fepriv->delay = 3 * HZ;
504 fepriv->quality = 0;
505 return;
506 }
507
508 /* get the frontend status */
509 if (fepriv->state & FESTATE_RETUNE) {
510 s = 0;
511 } else {
512 if (fe->ops.read_status)
513 fe->ops.read_status(fe, &s);
514 if (s != fepriv->status) {
515 dvb_frontend_add_event(fe, s);
516 fepriv->status = s;
517 }
518 }
519
520 /* if we're not tuned, and we have a lock, move to the TUNED state */
521 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
522 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
523 fepriv->state = FESTATE_TUNED;
524
525 /* if we're tuned, then we have determined the correct inversion */
526 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
527 (c->inversion == INVERSION_AUTO)) {
528 c->inversion = fepriv->inversion;
529 }
530 return;
531 }
532
533 /* if we are tuned already, check we're still locked */
534 if (fepriv->state & FESTATE_TUNED) {
535 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
536
537 /* we're tuned, and the lock is still good... */
538 if (s & FE_HAS_LOCK) {
539 return;
540 } else { /* if we _WERE_ tuned, but now don't have a lock */
541 fepriv->state = FESTATE_ZIGZAG_FAST;
542 fepriv->started_auto_step = fepriv->auto_step;
543 fepriv->check_wrapped = 0;
544 }
545 }
546
547 /* don't actually do anything if we're in the LOSTLOCK state,
548 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
549 if ((fepriv->state & FESTATE_LOSTLOCK) &&
550 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
551 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
552 return;
553 }
554
555 /* don't do anything if we're in the DISEQC state, since this
556 * might be someone with a motorized dish controlled by DISEQC.
557 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
558 if (fepriv->state & FESTATE_DISEQC) {
559 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
560 return;
561 }
562
563 /* if we're in the RETUNE state, set everything up for a brand
564 * new scan, keeping the current inversion setting, as the next
565 * tune is _very_ likely to require the same */
566 if (fepriv->state & FESTATE_RETUNE) {
567 fepriv->lnb_drift = 0;
568 fepriv->auto_step = 0;
569 fepriv->auto_sub_step = 0;
570 fepriv->started_auto_step = 0;
571 fepriv->check_wrapped = 0;
572 }
573
574 /* fast zigzag. */
575 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
576 fepriv->delay = fepriv->min_delay;
577
578 /* perform a tune */
579 retval = dvb_frontend_swzigzag_autotune(fe,
580 fepriv->check_wrapped);
581 if (retval < 0) {
582 return;
583 } else if (retval) {
584 /* OK, if we've run out of trials at the fast speed.
585 * Drop back to slow for the _next_ attempt */
586 fepriv->state = FESTATE_SEARCHING_SLOW;
587 fepriv->started_auto_step = fepriv->auto_step;
588 return;
589 }
590 fepriv->check_wrapped = 1;
591
592 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
593 * This ensures we cannot return from an
594 * FE_SET_FRONTEND ioctl before the first frontend tune
595 * occurs */
596 if (fepriv->state & FESTATE_RETUNE) {
597 fepriv->state = FESTATE_TUNING_FAST;
598 }
599 }
600
601 /* slow zigzag */
602 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
603 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
604
605 /* Note: don't bother checking for wrapping; we stay in this
606 * state until we get a lock */
607 dvb_frontend_swzigzag_autotune(fe, 0);
608 }
609 }
610
dvb_frontend_is_exiting(struct dvb_frontend * fe)611 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
612 {
613 struct dvb_frontend_private *fepriv = fe->frontend_priv;
614
615 if (fe->exit != DVB_FE_NO_EXIT)
616 return 1;
617
618 if (fepriv->dvbdev->writers == 1)
619 if (time_after_eq(jiffies, fepriv->release_jiffies +
620 dvb_shutdown_timeout * HZ))
621 return 1;
622
623 return 0;
624 }
625
dvb_frontend_should_wakeup(struct dvb_frontend * fe)626 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
627 {
628 struct dvb_frontend_private *fepriv = fe->frontend_priv;
629
630 if (fepriv->wakeup) {
631 fepriv->wakeup = 0;
632 return 1;
633 }
634 return dvb_frontend_is_exiting(fe);
635 }
636
dvb_frontend_wakeup(struct dvb_frontend * fe)637 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
638 {
639 struct dvb_frontend_private *fepriv = fe->frontend_priv;
640
641 fepriv->wakeup = 1;
642 wake_up_interruptible(&fepriv->wait_queue);
643 }
644
dvb_frontend_thread(void * data)645 static int dvb_frontend_thread(void *data)
646 {
647 struct dvb_frontend *fe = data;
648 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
649 struct dvb_frontend_private *fepriv = fe->frontend_priv;
650 enum fe_status s = FE_NONE;
651 enum dvbfe_algo algo;
652 bool re_tune = false;
653 bool semheld = false;
654
655 dev_dbg(fe->dvb->device, "%s:\n", __func__);
656
657 fepriv->check_wrapped = 0;
658 fepriv->quality = 0;
659 fepriv->delay = 3 * HZ;
660 fepriv->status = 0;
661 fepriv->wakeup = 0;
662 fepriv->reinitialise = 0;
663
664 dvb_frontend_init(fe);
665
666 set_freezable();
667 while (1) {
668 up(&fepriv->sem); /* is locked when we enter the thread... */
669 restart:
670 wait_event_interruptible_timeout(fepriv->wait_queue,
671 dvb_frontend_should_wakeup(fe) ||
672 kthread_should_stop() ||
673 freezing(current),
674 fepriv->delay);
675
676 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
677 /* got signal or quitting */
678 if (!down_interruptible(&fepriv->sem))
679 semheld = true;
680 fe->exit = DVB_FE_NORMAL_EXIT;
681 break;
682 }
683
684 if (try_to_freeze())
685 goto restart;
686
687 if (down_interruptible(&fepriv->sem))
688 break;
689
690 if (fepriv->reinitialise) {
691 dvb_frontend_init(fe);
692 if (fe->ops.set_tone && fepriv->tone != -1)
693 fe->ops.set_tone(fe, fepriv->tone);
694 if (fe->ops.set_voltage && fepriv->voltage != -1)
695 fe->ops.set_voltage(fe, fepriv->voltage);
696 fepriv->reinitialise = 0;
697 }
698
699 /* do an iteration of the tuning loop */
700 if (fe->ops.get_frontend_algo) {
701 algo = fe->ops.get_frontend_algo(fe);
702 switch (algo) {
703 case DVBFE_ALGO_HW:
704 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
705
706 if (fepriv->state & FESTATE_RETUNE) {
707 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
708 re_tune = true;
709 fepriv->state = FESTATE_TUNED;
710 } else {
711 re_tune = false;
712 }
713
714 if (fe->ops.tune)
715 fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
716
717 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
718 dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
719 dvb_frontend_add_event(fe, s);
720 fepriv->status = s;
721 }
722 break;
723 case DVBFE_ALGO_SW:
724 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
725 dvb_frontend_swzigzag(fe);
726 break;
727 case DVBFE_ALGO_CUSTOM:
728 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
729 if (fepriv->state & FESTATE_RETUNE) {
730 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
731 fepriv->state = FESTATE_TUNED;
732 }
733 /* Case where we are going to search for a carrier
734 * User asked us to retune again for some reason, possibly
735 * requesting a search with a new set of parameters
736 */
737 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
738 if (fe->ops.search) {
739 fepriv->algo_status = fe->ops.search(fe);
740 /* We did do a search as was requested, the flags are
741 * now unset as well and has the flags wrt to search.
742 */
743 } else {
744 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
745 }
746 }
747 /* Track the carrier if the search was successful */
748 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
749 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
750 fepriv->delay = HZ / 2;
751 }
752 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
753 fe->ops.read_status(fe, &s);
754 if (s != fepriv->status) {
755 dvb_frontend_add_event(fe, s); /* update event list */
756 fepriv->status = s;
757 if (!(s & FE_HAS_LOCK)) {
758 fepriv->delay = HZ / 10;
759 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
760 } else {
761 fepriv->delay = 60 * HZ;
762 }
763 }
764 break;
765 default:
766 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
767 break;
768 }
769 } else {
770 dvb_frontend_swzigzag(fe);
771 }
772 }
773
774 if (dvb_powerdown_on_sleep) {
775 if (fe->ops.set_voltage)
776 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
777 if (fe->ops.tuner_ops.sleep) {
778 if (fe->ops.i2c_gate_ctrl)
779 fe->ops.i2c_gate_ctrl(fe, 1);
780 fe->ops.tuner_ops.sleep(fe);
781 if (fe->ops.i2c_gate_ctrl)
782 fe->ops.i2c_gate_ctrl(fe, 0);
783 }
784 if (fe->ops.sleep)
785 fe->ops.sleep(fe);
786 }
787
788 fepriv->thread = NULL;
789 if (kthread_should_stop())
790 fe->exit = DVB_FE_DEVICE_REMOVED;
791 else
792 fe->exit = DVB_FE_NO_EXIT;
793 mb();
794
795 if (semheld)
796 up(&fepriv->sem);
797 dvb_frontend_wakeup(fe);
798 return 0;
799 }
800
dvb_frontend_stop(struct dvb_frontend * fe)801 static void dvb_frontend_stop(struct dvb_frontend *fe)
802 {
803 struct dvb_frontend_private *fepriv = fe->frontend_priv;
804
805 dev_dbg(fe->dvb->device, "%s:\n", __func__);
806
807 if (fe->exit != DVB_FE_DEVICE_REMOVED)
808 fe->exit = DVB_FE_NORMAL_EXIT;
809 mb();
810
811 if (!fepriv->thread)
812 return;
813
814 kthread_stop(fepriv->thread);
815
816 sema_init(&fepriv->sem, 1);
817 fepriv->state = FESTATE_IDLE;
818
819 /* paranoia check in case a signal arrived */
820 if (fepriv->thread)
821 dev_warn(fe->dvb->device,
822 "dvb_frontend_stop: warning: thread %p won't exit\n",
823 fepriv->thread);
824 }
825
826 /*
827 * Sleep for the amount of time given by add_usec parameter
828 *
829 * This needs to be as precise as possible, as it affects the detection of
830 * the dish tone command at the satellite subsystem. The precision is improved
831 * by using a scheduled msleep followed by udelay for the remainder.
832 */
dvb_frontend_sleep_until(ktime_t * waketime,u32 add_usec)833 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
834 {
835 s32 delta;
836
837 *waketime = ktime_add_us(*waketime, add_usec);
838 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
839 if (delta > 2500) {
840 msleep((delta - 1500) / 1000);
841 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
842 }
843 if (delta > 0)
844 udelay(delta);
845 }
846 EXPORT_SYMBOL(dvb_frontend_sleep_until);
847
dvb_frontend_start(struct dvb_frontend * fe)848 static int dvb_frontend_start(struct dvb_frontend *fe)
849 {
850 int ret;
851 struct dvb_frontend_private *fepriv = fe->frontend_priv;
852 struct task_struct *fe_thread;
853
854 dev_dbg(fe->dvb->device, "%s:\n", __func__);
855
856 if (fepriv->thread) {
857 if (fe->exit == DVB_FE_NO_EXIT)
858 return 0;
859 else
860 dvb_frontend_stop(fe);
861 }
862
863 if (signal_pending(current))
864 return -EINTR;
865 if (down_interruptible(&fepriv->sem))
866 return -EINTR;
867
868 fepriv->state = FESTATE_IDLE;
869 fe->exit = DVB_FE_NO_EXIT;
870 fepriv->thread = NULL;
871 mb();
872
873 fe_thread = kthread_run(dvb_frontend_thread, fe,
874 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
875 if (IS_ERR(fe_thread)) {
876 ret = PTR_ERR(fe_thread);
877 dev_warn(fe->dvb->device,
878 "dvb_frontend_start: failed to start kthread (%d)\n",
879 ret);
880 up(&fepriv->sem);
881 return ret;
882 }
883 fepriv->thread = fe_thread;
884 return 0;
885 }
886
dvb_frontend_get_frequency_limits(struct dvb_frontend * fe,u32 * freq_min,u32 * freq_max,u32 * tolerance)887 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
888 u32 *freq_min, u32 *freq_max,
889 u32 *tolerance)
890 {
891 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
892 u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
893 u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
894 u32 frontend_min = fe->ops.info.frequency_min_hz;
895 u32 frontend_max = fe->ops.info.frequency_max_hz;
896
897 *freq_min = max(frontend_min, tuner_min);
898
899 if (frontend_max == 0)
900 *freq_max = tuner_max;
901 else if (tuner_max == 0)
902 *freq_max = frontend_max;
903 else
904 *freq_max = min(frontend_max, tuner_max);
905
906 if (*freq_min == 0 || *freq_max == 0)
907 dev_warn(fe->dvb->device,
908 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
909 fe->dvb->num, fe->id);
910
911 dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
912 tuner_min, tuner_max, frontend_min, frontend_max);
913
914 /* If the standard is for satellite, convert frequencies to kHz */
915 switch (c->delivery_system) {
916 case SYS_DVBS:
917 case SYS_DVBS2:
918 case SYS_TURBO:
919 case SYS_ISDBS:
920 *freq_min /= kHz;
921 *freq_max /= kHz;
922 if (tolerance)
923 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
924
925 break;
926 default:
927 if (tolerance)
928 *tolerance = fe->ops.info.frequency_tolerance_hz;
929 break;
930 }
931 }
932
dvb_frontend_get_stepsize(struct dvb_frontend * fe)933 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
934 {
935 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
936 u32 fe_step = fe->ops.info.frequency_stepsize_hz;
937 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
938 u32 step = max(fe_step, tuner_step);
939
940 switch (c->delivery_system) {
941 case SYS_DVBS:
942 case SYS_DVBS2:
943 case SYS_TURBO:
944 case SYS_ISDBS:
945 step /= kHz;
946 break;
947 default:
948 break;
949 }
950
951 return step;
952 }
953
dvb_frontend_check_parameters(struct dvb_frontend * fe)954 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
955 {
956 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
957 u32 freq_min;
958 u32 freq_max;
959
960 /* range check: frequency */
961 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
962 if ((freq_min && c->frequency < freq_min) ||
963 (freq_max && c->frequency > freq_max)) {
964 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
965 fe->dvb->num, fe->id, c->frequency,
966 freq_min, freq_max);
967 return -EINVAL;
968 }
969
970 /* range check: symbol rate */
971 switch (c->delivery_system) {
972 case SYS_DVBS:
973 case SYS_DVBS2:
974 case SYS_TURBO:
975 case SYS_DVBC_ANNEX_A:
976 case SYS_DVBC_ANNEX_C:
977 if ((fe->ops.info.symbol_rate_min &&
978 c->symbol_rate < fe->ops.info.symbol_rate_min) ||
979 (fe->ops.info.symbol_rate_max &&
980 c->symbol_rate > fe->ops.info.symbol_rate_max)) {
981 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
982 fe->dvb->num, fe->id, c->symbol_rate,
983 fe->ops.info.symbol_rate_min,
984 fe->ops.info.symbol_rate_max);
985 return -EINVAL;
986 }
987 default:
988 break;
989 }
990
991 return 0;
992 }
993
dvb_frontend_clear_cache(struct dvb_frontend * fe)994 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
995 {
996 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
997 int i;
998 u32 delsys;
999
1000 delsys = c->delivery_system;
1001 memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1002 c->delivery_system = delsys;
1003
1004 dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1005 __func__, c->delivery_system);
1006
1007 c->transmission_mode = TRANSMISSION_MODE_AUTO;
1008 c->bandwidth_hz = 0; /* AUTO */
1009 c->guard_interval = GUARD_INTERVAL_AUTO;
1010 c->hierarchy = HIERARCHY_AUTO;
1011 c->symbol_rate = 0;
1012 c->code_rate_HP = FEC_AUTO;
1013 c->code_rate_LP = FEC_AUTO;
1014 c->fec_inner = FEC_AUTO;
1015 c->rolloff = ROLLOFF_AUTO;
1016 c->voltage = SEC_VOLTAGE_OFF;
1017 c->sectone = SEC_TONE_OFF;
1018 c->pilot = PILOT_AUTO;
1019
1020 c->isdbt_partial_reception = 0;
1021 c->isdbt_sb_mode = 0;
1022 c->isdbt_sb_subchannel = 0;
1023 c->isdbt_sb_segment_idx = 0;
1024 c->isdbt_sb_segment_count = 0;
1025 c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */
1026 for (i = 0; i < 3; i++) {
1027 c->layer[i].fec = FEC_AUTO;
1028 c->layer[i].modulation = QAM_AUTO;
1029 c->layer[i].interleaving = 0;
1030 c->layer[i].segment_count = 0;
1031 }
1032
1033 c->stream_id = NO_STREAM_ID_FILTER;
1034 c->scrambling_sequence_index = 0;/* default sequence */
1035
1036 switch (c->delivery_system) {
1037 case SYS_DVBS:
1038 case SYS_DVBS2:
1039 case SYS_TURBO:
1040 c->modulation = QPSK; /* implied for DVB-S in legacy API */
1041 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1042 break;
1043 case SYS_ATSC:
1044 c->modulation = VSB_8;
1045 break;
1046 case SYS_ISDBS:
1047 c->symbol_rate = 28860000;
1048 c->rolloff = ROLLOFF_35;
1049 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1050 break;
1051 default:
1052 c->modulation = QAM_AUTO;
1053 break;
1054 }
1055
1056 c->lna = LNA_AUTO;
1057
1058 return 0;
1059 }
1060
1061 #define _DTV_CMD(n, s, b) \
1062 [n] = { \
1063 .name = #n, \
1064 .cmd = n, \
1065 .set = s,\
1066 .buffer = b \
1067 }
1068
1069 struct dtv_cmds_h {
1070 char *name; /* A display name for debugging purposes */
1071
1072 __u32 cmd; /* A unique ID */
1073
1074 /* Flags */
1075 __u32 set:1; /* Either a set or get property */
1076 __u32 buffer:1; /* Does this property use the buffer? */
1077 __u32 reserved:30; /* Align */
1078 };
1079
1080 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1081 _DTV_CMD(DTV_TUNE, 1, 0),
1082 _DTV_CMD(DTV_CLEAR, 1, 0),
1083
1084 /* Set */
1085 _DTV_CMD(DTV_FREQUENCY, 1, 0),
1086 _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1087 _DTV_CMD(DTV_MODULATION, 1, 0),
1088 _DTV_CMD(DTV_INVERSION, 1, 0),
1089 _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1090 _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1091 _DTV_CMD(DTV_INNER_FEC, 1, 0),
1092 _DTV_CMD(DTV_VOLTAGE, 1, 0),
1093 _DTV_CMD(DTV_TONE, 1, 0),
1094 _DTV_CMD(DTV_PILOT, 1, 0),
1095 _DTV_CMD(DTV_ROLLOFF, 1, 0),
1096 _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1097 _DTV_CMD(DTV_HIERARCHY, 1, 0),
1098 _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1099 _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1100 _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1101 _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1102 _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1103
1104 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1105 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1106 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1107 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1108 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1109 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1110 _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1111 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1112 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1113 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1114 _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1115 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1116 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1117 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1118 _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1119 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1120 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1121 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1122
1123 _DTV_CMD(DTV_STREAM_ID, 1, 0),
1124 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1125 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1126 _DTV_CMD(DTV_LNA, 1, 0),
1127
1128 /* Get */
1129 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1130 _DTV_CMD(DTV_API_VERSION, 0, 0),
1131
1132 _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1133
1134 _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1135 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1136
1137 _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1138 _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1139 _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1140 _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1141 _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1142 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1143 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1144 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1145 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1146 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1147 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1148 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1149 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1150
1151 /* Statistics API */
1152 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1153 _DTV_CMD(DTV_STAT_CNR, 0, 0),
1154 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1155 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1156 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1157 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1158 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1159 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1160 };
1161
1162 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1163 * drivers can use a single set_frontend tuning function, regardless of whether
1164 * it's being used for the legacy or new API, reducing code and complexity.
1165 */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1166 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1167 struct dtv_frontend_properties *c,
1168 const struct dvb_frontend_parameters *p)
1169 {
1170 c->frequency = p->frequency;
1171 c->inversion = p->inversion;
1172
1173 switch (dvbv3_type(c->delivery_system)) {
1174 case DVBV3_QPSK:
1175 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1176 c->symbol_rate = p->u.qpsk.symbol_rate;
1177 c->fec_inner = p->u.qpsk.fec_inner;
1178 break;
1179 case DVBV3_QAM:
1180 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1181 c->symbol_rate = p->u.qam.symbol_rate;
1182 c->fec_inner = p->u.qam.fec_inner;
1183 c->modulation = p->u.qam.modulation;
1184 break;
1185 case DVBV3_OFDM:
1186 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1187
1188 switch (p->u.ofdm.bandwidth) {
1189 case BANDWIDTH_10_MHZ:
1190 c->bandwidth_hz = 10000000;
1191 break;
1192 case BANDWIDTH_8_MHZ:
1193 c->bandwidth_hz = 8000000;
1194 break;
1195 case BANDWIDTH_7_MHZ:
1196 c->bandwidth_hz = 7000000;
1197 break;
1198 case BANDWIDTH_6_MHZ:
1199 c->bandwidth_hz = 6000000;
1200 break;
1201 case BANDWIDTH_5_MHZ:
1202 c->bandwidth_hz = 5000000;
1203 break;
1204 case BANDWIDTH_1_712_MHZ:
1205 c->bandwidth_hz = 1712000;
1206 break;
1207 case BANDWIDTH_AUTO:
1208 c->bandwidth_hz = 0;
1209 }
1210
1211 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1212 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1213 c->modulation = p->u.ofdm.constellation;
1214 c->transmission_mode = p->u.ofdm.transmission_mode;
1215 c->guard_interval = p->u.ofdm.guard_interval;
1216 c->hierarchy = p->u.ofdm.hierarchy_information;
1217 break;
1218 case DVBV3_ATSC:
1219 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1220 c->modulation = p->u.vsb.modulation;
1221 if (c->delivery_system == SYS_ATSCMH)
1222 break;
1223 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1224 c->delivery_system = SYS_ATSC;
1225 else
1226 c->delivery_system = SYS_DVBC_ANNEX_B;
1227 break;
1228 case DVBV3_UNKNOWN:
1229 dev_err(fe->dvb->device,
1230 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1231 __func__, c->delivery_system);
1232 return -EINVAL;
1233 }
1234
1235 return 0;
1236 }
1237
1238 /* Ensure the cached values are set correctly in the frontend
1239 * legacy tuning structures, for the advanced tuning API.
1240 */
1241 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1242 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1243 const struct dtv_frontend_properties *c,
1244 struct dvb_frontend_parameters *p)
1245 {
1246 p->frequency = c->frequency;
1247 p->inversion = c->inversion;
1248
1249 switch (dvbv3_type(c->delivery_system)) {
1250 case DVBV3_UNKNOWN:
1251 dev_err(fe->dvb->device,
1252 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1253 __func__, c->delivery_system);
1254 return -EINVAL;
1255 case DVBV3_QPSK:
1256 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1257 p->u.qpsk.symbol_rate = c->symbol_rate;
1258 p->u.qpsk.fec_inner = c->fec_inner;
1259 break;
1260 case DVBV3_QAM:
1261 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1262 p->u.qam.symbol_rate = c->symbol_rate;
1263 p->u.qam.fec_inner = c->fec_inner;
1264 p->u.qam.modulation = c->modulation;
1265 break;
1266 case DVBV3_OFDM:
1267 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1268 switch (c->bandwidth_hz) {
1269 case 10000000:
1270 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1271 break;
1272 case 8000000:
1273 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1274 break;
1275 case 7000000:
1276 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1277 break;
1278 case 6000000:
1279 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1280 break;
1281 case 5000000:
1282 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1283 break;
1284 case 1712000:
1285 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1286 break;
1287 case 0:
1288 default:
1289 p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1290 }
1291 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1292 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1293 p->u.ofdm.constellation = c->modulation;
1294 p->u.ofdm.transmission_mode = c->transmission_mode;
1295 p->u.ofdm.guard_interval = c->guard_interval;
1296 p->u.ofdm.hierarchy_information = c->hierarchy;
1297 break;
1298 case DVBV3_ATSC:
1299 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1300 p->u.vsb.modulation = c->modulation;
1301 break;
1302 }
1303 return 0;
1304 }
1305
1306 /**
1307 * dtv_get_frontend - calls a callback for retrieving DTV parameters
1308 * @fe: struct dvb_frontend pointer
1309 * @c: struct dtv_frontend_properties pointer (DVBv5 cache)
1310 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1311 *
1312 * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1313 * If c is not null, it will update the DVBv5 cache struct pointed by it.
1314 * If p_out is not null, it will update the DVBv3 params pointed by it.
1315 */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1316 static int dtv_get_frontend(struct dvb_frontend *fe,
1317 struct dtv_frontend_properties *c,
1318 struct dvb_frontend_parameters *p_out)
1319 {
1320 int r;
1321
1322 if (fe->ops.get_frontend) {
1323 r = fe->ops.get_frontend(fe, c);
1324 if (unlikely(r < 0))
1325 return r;
1326 if (p_out)
1327 dtv_property_legacy_params_sync(fe, c, p_out);
1328 return 0;
1329 }
1330
1331 /* As everything is in cache, get_frontend fops are always supported */
1332 return 0;
1333 }
1334
1335 static int dvb_frontend_handle_ioctl(struct file *file,
1336 unsigned int cmd, void *parg);
1337
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1338 static int dtv_property_process_get(struct dvb_frontend *fe,
1339 const struct dtv_frontend_properties *c,
1340 struct dtv_property *tvp,
1341 struct file *file)
1342 {
1343 int ncaps;
1344
1345 switch (tvp->cmd) {
1346 case DTV_ENUM_DELSYS:
1347 ncaps = 0;
1348 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1349 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1350 ncaps++;
1351 }
1352 tvp->u.buffer.len = ncaps;
1353 break;
1354 case DTV_FREQUENCY:
1355 tvp->u.data = c->frequency;
1356 break;
1357 case DTV_MODULATION:
1358 tvp->u.data = c->modulation;
1359 break;
1360 case DTV_BANDWIDTH_HZ:
1361 tvp->u.data = c->bandwidth_hz;
1362 break;
1363 case DTV_INVERSION:
1364 tvp->u.data = c->inversion;
1365 break;
1366 case DTV_SYMBOL_RATE:
1367 tvp->u.data = c->symbol_rate;
1368 break;
1369 case DTV_INNER_FEC:
1370 tvp->u.data = c->fec_inner;
1371 break;
1372 case DTV_PILOT:
1373 tvp->u.data = c->pilot;
1374 break;
1375 case DTV_ROLLOFF:
1376 tvp->u.data = c->rolloff;
1377 break;
1378 case DTV_DELIVERY_SYSTEM:
1379 tvp->u.data = c->delivery_system;
1380 break;
1381 case DTV_VOLTAGE:
1382 tvp->u.data = c->voltage;
1383 break;
1384 case DTV_TONE:
1385 tvp->u.data = c->sectone;
1386 break;
1387 case DTV_API_VERSION:
1388 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1389 break;
1390 case DTV_CODE_RATE_HP:
1391 tvp->u.data = c->code_rate_HP;
1392 break;
1393 case DTV_CODE_RATE_LP:
1394 tvp->u.data = c->code_rate_LP;
1395 break;
1396 case DTV_GUARD_INTERVAL:
1397 tvp->u.data = c->guard_interval;
1398 break;
1399 case DTV_TRANSMISSION_MODE:
1400 tvp->u.data = c->transmission_mode;
1401 break;
1402 case DTV_HIERARCHY:
1403 tvp->u.data = c->hierarchy;
1404 break;
1405 case DTV_INTERLEAVING:
1406 tvp->u.data = c->interleaving;
1407 break;
1408
1409 /* ISDB-T Support here */
1410 case DTV_ISDBT_PARTIAL_RECEPTION:
1411 tvp->u.data = c->isdbt_partial_reception;
1412 break;
1413 case DTV_ISDBT_SOUND_BROADCASTING:
1414 tvp->u.data = c->isdbt_sb_mode;
1415 break;
1416 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1417 tvp->u.data = c->isdbt_sb_subchannel;
1418 break;
1419 case DTV_ISDBT_SB_SEGMENT_IDX:
1420 tvp->u.data = c->isdbt_sb_segment_idx;
1421 break;
1422 case DTV_ISDBT_SB_SEGMENT_COUNT:
1423 tvp->u.data = c->isdbt_sb_segment_count;
1424 break;
1425 case DTV_ISDBT_LAYER_ENABLED:
1426 tvp->u.data = c->isdbt_layer_enabled;
1427 break;
1428 case DTV_ISDBT_LAYERA_FEC:
1429 tvp->u.data = c->layer[0].fec;
1430 break;
1431 case DTV_ISDBT_LAYERA_MODULATION:
1432 tvp->u.data = c->layer[0].modulation;
1433 break;
1434 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1435 tvp->u.data = c->layer[0].segment_count;
1436 break;
1437 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1438 tvp->u.data = c->layer[0].interleaving;
1439 break;
1440 case DTV_ISDBT_LAYERB_FEC:
1441 tvp->u.data = c->layer[1].fec;
1442 break;
1443 case DTV_ISDBT_LAYERB_MODULATION:
1444 tvp->u.data = c->layer[1].modulation;
1445 break;
1446 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1447 tvp->u.data = c->layer[1].segment_count;
1448 break;
1449 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1450 tvp->u.data = c->layer[1].interleaving;
1451 break;
1452 case DTV_ISDBT_LAYERC_FEC:
1453 tvp->u.data = c->layer[2].fec;
1454 break;
1455 case DTV_ISDBT_LAYERC_MODULATION:
1456 tvp->u.data = c->layer[2].modulation;
1457 break;
1458 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1459 tvp->u.data = c->layer[2].segment_count;
1460 break;
1461 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1462 tvp->u.data = c->layer[2].interleaving;
1463 break;
1464
1465 /* Multistream support */
1466 case DTV_STREAM_ID:
1467 case DTV_DVBT2_PLP_ID_LEGACY:
1468 tvp->u.data = c->stream_id;
1469 break;
1470
1471 /* Physical layer scrambling support */
1472 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1473 tvp->u.data = c->scrambling_sequence_index;
1474 break;
1475
1476 /* ATSC-MH */
1477 case DTV_ATSCMH_FIC_VER:
1478 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1479 break;
1480 case DTV_ATSCMH_PARADE_ID:
1481 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1482 break;
1483 case DTV_ATSCMH_NOG:
1484 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1485 break;
1486 case DTV_ATSCMH_TNOG:
1487 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1488 break;
1489 case DTV_ATSCMH_SGN:
1490 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1491 break;
1492 case DTV_ATSCMH_PRC:
1493 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1494 break;
1495 case DTV_ATSCMH_RS_FRAME_MODE:
1496 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1497 break;
1498 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1499 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1500 break;
1501 case DTV_ATSCMH_RS_CODE_MODE_PRI:
1502 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1503 break;
1504 case DTV_ATSCMH_RS_CODE_MODE_SEC:
1505 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1506 break;
1507 case DTV_ATSCMH_SCCC_BLOCK_MODE:
1508 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1509 break;
1510 case DTV_ATSCMH_SCCC_CODE_MODE_A:
1511 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1512 break;
1513 case DTV_ATSCMH_SCCC_CODE_MODE_B:
1514 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1515 break;
1516 case DTV_ATSCMH_SCCC_CODE_MODE_C:
1517 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1518 break;
1519 case DTV_ATSCMH_SCCC_CODE_MODE_D:
1520 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1521 break;
1522
1523 case DTV_LNA:
1524 tvp->u.data = c->lna;
1525 break;
1526
1527 /* Fill quality measures */
1528 case DTV_STAT_SIGNAL_STRENGTH:
1529 tvp->u.st = c->strength;
1530 break;
1531 case DTV_STAT_CNR:
1532 tvp->u.st = c->cnr;
1533 break;
1534 case DTV_STAT_PRE_ERROR_BIT_COUNT:
1535 tvp->u.st = c->pre_bit_error;
1536 break;
1537 case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1538 tvp->u.st = c->pre_bit_count;
1539 break;
1540 case DTV_STAT_POST_ERROR_BIT_COUNT:
1541 tvp->u.st = c->post_bit_error;
1542 break;
1543 case DTV_STAT_POST_TOTAL_BIT_COUNT:
1544 tvp->u.st = c->post_bit_count;
1545 break;
1546 case DTV_STAT_ERROR_BLOCK_COUNT:
1547 tvp->u.st = c->block_error;
1548 break;
1549 case DTV_STAT_TOTAL_BLOCK_COUNT:
1550 tvp->u.st = c->block_count;
1551 break;
1552 default:
1553 dev_dbg(fe->dvb->device,
1554 "%s: FE property %d doesn't exist\n",
1555 __func__, tvp->cmd);
1556 return -EINVAL;
1557 }
1558
1559 if (!dtv_cmds[tvp->cmd].buffer)
1560 dev_dbg(fe->dvb->device,
1561 "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1562 __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1563 tvp->u.data);
1564 else
1565 dev_dbg(fe->dvb->device,
1566 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1567 __func__,
1568 tvp->cmd, dtv_cmds[tvp->cmd].name,
1569 tvp->u.buffer.len,
1570 tvp->u.buffer.len, tvp->u.buffer.data);
1571
1572 return 0;
1573 }
1574
1575 static int dtv_set_frontend(struct dvb_frontend *fe);
1576
is_dvbv3_delsys(u32 delsys)1577 static bool is_dvbv3_delsys(u32 delsys)
1578 {
1579 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1580 (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1581 }
1582
1583 /**
1584 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1585 * @fe: struct frontend;
1586 * @delsys: DVBv5 type that will be used for emulation
1587 *
1588 * Provides emulation for delivery systems that are compatible with the old
1589 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1590 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1591 * parameters are compatible with DVB-S spec.
1592 */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1593 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1594 {
1595 int i;
1596 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1597
1598 c->delivery_system = delsys;
1599
1600 /*
1601 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1602 */
1603 if (c->delivery_system == SYS_ISDBT) {
1604 dev_dbg(fe->dvb->device,
1605 "%s: Using defaults for SYS_ISDBT\n",
1606 __func__);
1607
1608 if (!c->bandwidth_hz)
1609 c->bandwidth_hz = 6000000;
1610
1611 c->isdbt_partial_reception = 0;
1612 c->isdbt_sb_mode = 0;
1613 c->isdbt_sb_subchannel = 0;
1614 c->isdbt_sb_segment_idx = 0;
1615 c->isdbt_sb_segment_count = 0;
1616 c->isdbt_layer_enabled = 7;
1617 for (i = 0; i < 3; i++) {
1618 c->layer[i].fec = FEC_AUTO;
1619 c->layer[i].modulation = QAM_AUTO;
1620 c->layer[i].interleaving = 0;
1621 c->layer[i].segment_count = 0;
1622 }
1623 }
1624 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1625 __func__, c->delivery_system);
1626
1627 return 0;
1628 }
1629
1630 /**
1631 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1632 * @fe: frontend struct
1633 * @desired_system: delivery system requested by the user
1634 *
1635 * A DVBv5 call know what's the desired system it wants. So, set it.
1636 *
1637 * There are, however, a few known issues with early DVBv5 applications that
1638 * are also handled by this logic:
1639 *
1640 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1641 * This is an API violation, but, as we don't want to break userspace,
1642 * convert it to the first supported delivery system.
1643 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1644 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1645 * ISDB-T provided backward compat with DVB-T.
1646 */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1647 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1648 u32 desired_system)
1649 {
1650 int ncaps;
1651 u32 delsys = SYS_UNDEFINED;
1652 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1653 enum dvbv3_emulation_type type;
1654
1655 /*
1656 * It was reported that some old DVBv5 applications were
1657 * filling delivery_system with SYS_UNDEFINED. If this happens,
1658 * assume that the application wants to use the first supported
1659 * delivery system.
1660 */
1661 if (desired_system == SYS_UNDEFINED)
1662 desired_system = fe->ops.delsys[0];
1663
1664 /*
1665 * This is a DVBv5 call. So, it likely knows the supported
1666 * delivery systems. So, check if the desired delivery system is
1667 * supported
1668 */
1669 ncaps = 0;
1670 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1671 if (fe->ops.delsys[ncaps] == desired_system) {
1672 c->delivery_system = desired_system;
1673 dev_dbg(fe->dvb->device,
1674 "%s: Changing delivery system to %d\n",
1675 __func__, desired_system);
1676 return 0;
1677 }
1678 ncaps++;
1679 }
1680
1681 /*
1682 * The requested delivery system isn't supported. Maybe userspace
1683 * is requesting a DVBv3 compatible delivery system.
1684 *
1685 * The emulation only works if the desired system is one of the
1686 * delivery systems supported by DVBv3 API
1687 */
1688 if (!is_dvbv3_delsys(desired_system)) {
1689 dev_dbg(fe->dvb->device,
1690 "%s: Delivery system %d not supported.\n",
1691 __func__, desired_system);
1692 return -EINVAL;
1693 }
1694
1695 type = dvbv3_type(desired_system);
1696
1697 /*
1698 * Get the last non-DVBv3 delivery system that has the same type
1699 * of the desired system
1700 */
1701 ncaps = 0;
1702 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1704 delsys = fe->ops.delsys[ncaps];
1705 ncaps++;
1706 }
1707
1708 /* There's nothing compatible with the desired delivery system */
1709 if (delsys == SYS_UNDEFINED) {
1710 dev_dbg(fe->dvb->device,
1711 "%s: Delivery system %d not supported on emulation mode.\n",
1712 __func__, desired_system);
1713 return -EINVAL;
1714 }
1715
1716 dev_dbg(fe->dvb->device,
1717 "%s: Using delivery system %d emulated as if it were %d\n",
1718 __func__, delsys, desired_system);
1719
1720 return emulate_delivery_system(fe, desired_system);
1721 }
1722
1723 /**
1724 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1725 * @fe: frontend struct
1726 *
1727 * A DVBv3 call doesn't know what's the desired system it wants. It also
1728 * doesn't allow to switch between different types. Due to that, userspace
1729 * should use DVBv5 instead.
1730 * However, in order to avoid breaking userspace API, limited backward
1731 * compatibility support is provided.
1732 *
1733 * There are some delivery systems that are incompatible with DVBv3 calls.
1734 *
1735 * This routine should work fine for frontends that support just one delivery
1736 * system.
1737 *
1738 * For frontends that support multiple frontends:
1739 * 1) It defaults to use the first supported delivery system. There's an
1740 * userspace application that allows changing it at runtime;
1741 *
1742 * 2) If the current delivery system is not compatible with DVBv3, it gets
1743 * the first one that it is compatible.
1744 *
1745 * NOTE: in order for this to work with applications like Kaffeine that
1746 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1747 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1748 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1749 * to DVB-S.
1750 */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1751 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1752 {
1753 int ncaps;
1754 u32 delsys = SYS_UNDEFINED;
1755 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1756
1757 /* If not set yet, defaults to the first supported delivery system */
1758 if (c->delivery_system == SYS_UNDEFINED)
1759 c->delivery_system = fe->ops.delsys[0];
1760
1761 /*
1762 * Trivial case: just use the current one, if it already a DVBv3
1763 * delivery system
1764 */
1765 if (is_dvbv3_delsys(c->delivery_system)) {
1766 dev_dbg(fe->dvb->device,
1767 "%s: Using delivery system to %d\n",
1768 __func__, c->delivery_system);
1769 return 0;
1770 }
1771
1772 /*
1773 * Seek for the first delivery system that it is compatible with a
1774 * DVBv3 standard
1775 */
1776 ncaps = 0;
1777 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1778 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1779 delsys = fe->ops.delsys[ncaps];
1780 break;
1781 }
1782 ncaps++;
1783 }
1784 if (delsys == SYS_UNDEFINED) {
1785 dev_dbg(fe->dvb->device,
1786 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1787 __func__);
1788 return -EINVAL;
1789 }
1790 return emulate_delivery_system(fe, delsys);
1791 }
1792
1793 /**
1794 * dtv_property_process_set - Sets a single DTV property
1795 * @fe: Pointer to &struct dvb_frontend
1796 * @file: Pointer to &struct file
1797 * @cmd: Digital TV command
1798 * @data: An unsigned 32-bits number
1799 *
1800 * This routine assigns the property
1801 * value to the corresponding member of
1802 * &struct dtv_frontend_properties
1803 *
1804 * Returns:
1805 * Zero on success, negative errno on failure.
1806 */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1807 static int dtv_property_process_set(struct dvb_frontend *fe,
1808 struct file *file,
1809 u32 cmd, u32 data)
1810 {
1811 int r = 0;
1812 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1813
1814 /** Dump DTV command name and value*/
1815 if (!cmd || cmd > DTV_MAX_COMMAND)
1816 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1817 __func__, cmd);
1818 else
1819 dev_dbg(fe->dvb->device,
1820 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1821 __func__, cmd, dtv_cmds[cmd].name, data);
1822 switch (cmd) {
1823 case DTV_CLEAR:
1824 /*
1825 * Reset a cache of data specific to the frontend here. This does
1826 * not effect hardware.
1827 */
1828 dvb_frontend_clear_cache(fe);
1829 break;
1830 case DTV_TUNE:
1831 /*
1832 * Use the cached Digital TV properties to tune the
1833 * frontend
1834 */
1835 dev_dbg(fe->dvb->device,
1836 "%s: Setting the frontend from property cache\n",
1837 __func__);
1838
1839 r = dtv_set_frontend(fe);
1840 break;
1841 case DTV_FREQUENCY:
1842 c->frequency = data;
1843 break;
1844 case DTV_MODULATION:
1845 c->modulation = data;
1846 break;
1847 case DTV_BANDWIDTH_HZ:
1848 c->bandwidth_hz = data;
1849 break;
1850 case DTV_INVERSION:
1851 c->inversion = data;
1852 break;
1853 case DTV_SYMBOL_RATE:
1854 c->symbol_rate = data;
1855 break;
1856 case DTV_INNER_FEC:
1857 c->fec_inner = data;
1858 break;
1859 case DTV_PILOT:
1860 c->pilot = data;
1861 break;
1862 case DTV_ROLLOFF:
1863 c->rolloff = data;
1864 break;
1865 case DTV_DELIVERY_SYSTEM:
1866 r = dvbv5_set_delivery_system(fe, data);
1867 break;
1868 case DTV_VOLTAGE:
1869 c->voltage = data;
1870 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1871 (void *)c->voltage);
1872 break;
1873 case DTV_TONE:
1874 c->sectone = data;
1875 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1876 (void *)c->sectone);
1877 break;
1878 case DTV_CODE_RATE_HP:
1879 c->code_rate_HP = data;
1880 break;
1881 case DTV_CODE_RATE_LP:
1882 c->code_rate_LP = data;
1883 break;
1884 case DTV_GUARD_INTERVAL:
1885 c->guard_interval = data;
1886 break;
1887 case DTV_TRANSMISSION_MODE:
1888 c->transmission_mode = data;
1889 break;
1890 case DTV_HIERARCHY:
1891 c->hierarchy = data;
1892 break;
1893 case DTV_INTERLEAVING:
1894 c->interleaving = data;
1895 break;
1896
1897 /* ISDB-T Support here */
1898 case DTV_ISDBT_PARTIAL_RECEPTION:
1899 c->isdbt_partial_reception = data;
1900 break;
1901 case DTV_ISDBT_SOUND_BROADCASTING:
1902 c->isdbt_sb_mode = data;
1903 break;
1904 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1905 c->isdbt_sb_subchannel = data;
1906 break;
1907 case DTV_ISDBT_SB_SEGMENT_IDX:
1908 c->isdbt_sb_segment_idx = data;
1909 break;
1910 case DTV_ISDBT_SB_SEGMENT_COUNT:
1911 c->isdbt_sb_segment_count = data;
1912 break;
1913 case DTV_ISDBT_LAYER_ENABLED:
1914 c->isdbt_layer_enabled = data;
1915 break;
1916 case DTV_ISDBT_LAYERA_FEC:
1917 c->layer[0].fec = data;
1918 break;
1919 case DTV_ISDBT_LAYERA_MODULATION:
1920 c->layer[0].modulation = data;
1921 break;
1922 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1923 c->layer[0].segment_count = data;
1924 break;
1925 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1926 c->layer[0].interleaving = data;
1927 break;
1928 case DTV_ISDBT_LAYERB_FEC:
1929 c->layer[1].fec = data;
1930 break;
1931 case DTV_ISDBT_LAYERB_MODULATION:
1932 c->layer[1].modulation = data;
1933 break;
1934 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1935 c->layer[1].segment_count = data;
1936 break;
1937 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1938 c->layer[1].interleaving = data;
1939 break;
1940 case DTV_ISDBT_LAYERC_FEC:
1941 c->layer[2].fec = data;
1942 break;
1943 case DTV_ISDBT_LAYERC_MODULATION:
1944 c->layer[2].modulation = data;
1945 break;
1946 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1947 c->layer[2].segment_count = data;
1948 break;
1949 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1950 c->layer[2].interleaving = data;
1951 break;
1952
1953 /* Multistream support */
1954 case DTV_STREAM_ID:
1955 case DTV_DVBT2_PLP_ID_LEGACY:
1956 c->stream_id = data;
1957 break;
1958
1959 /* Physical layer scrambling support */
1960 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1961 c->scrambling_sequence_index = data;
1962 break;
1963
1964 /* ATSC-MH */
1965 case DTV_ATSCMH_PARADE_ID:
1966 fe->dtv_property_cache.atscmh_parade_id = data;
1967 break;
1968 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1969 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1970 break;
1971
1972 case DTV_LNA:
1973 c->lna = data;
1974 if (fe->ops.set_lna)
1975 r = fe->ops.set_lna(fe);
1976 if (r < 0)
1977 c->lna = LNA_AUTO;
1978 break;
1979
1980 default:
1981 return -EINVAL;
1982 }
1983
1984 return r;
1985 }
1986
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)1987 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
1988 void *parg)
1989 {
1990 struct dvb_device *dvbdev = file->private_data;
1991 struct dvb_frontend *fe = dvbdev->priv;
1992 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1993 int err;
1994
1995 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
1996 if (down_interruptible(&fepriv->sem))
1997 return -ERESTARTSYS;
1998
1999 if (fe->exit != DVB_FE_NO_EXIT) {
2000 up(&fepriv->sem);
2001 return -ENODEV;
2002 }
2003
2004 /*
2005 * If the frontend is opened in read-only mode, only the ioctls
2006 * that don't interfere with the tune logic should be accepted.
2007 * That allows an external application to monitor the DVB QoS and
2008 * statistics parameters.
2009 *
2010 * That matches all _IOR() ioctls, except for two special cases:
2011 * - FE_GET_EVENT is part of the tuning logic on a DVB application;
2012 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2013 * setup
2014 * So, those two ioctls should also return -EPERM, as otherwise
2015 * reading from them would interfere with a DVB tune application
2016 */
2017 if ((file->f_flags & O_ACCMODE) == O_RDONLY
2018 && (_IOC_DIR(cmd) != _IOC_READ
2019 || cmd == FE_GET_EVENT
2020 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2021 up(&fepriv->sem);
2022 return -EPERM;
2023 }
2024
2025 err = dvb_frontend_handle_ioctl(file, cmd, parg);
2026
2027 up(&fepriv->sem);
2028 return err;
2029 }
2030
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2031 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2032 unsigned long arg)
2033 {
2034 struct dvb_device *dvbdev = file->private_data;
2035
2036 if (!dvbdev)
2037 return -ENODEV;
2038
2039 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2040 }
2041
2042 #ifdef CONFIG_COMPAT
2043 struct compat_dtv_property {
2044 __u32 cmd;
2045 __u32 reserved[3];
2046 union {
2047 __u32 data;
2048 struct dtv_fe_stats st;
2049 struct {
2050 __u8 data[32];
2051 __u32 len;
2052 __u32 reserved1[3];
2053 compat_uptr_t reserved2;
2054 } buffer;
2055 } u;
2056 int result;
2057 } __attribute__ ((packed));
2058
2059 struct compat_dtv_properties {
2060 __u32 num;
2061 compat_uptr_t props;
2062 };
2063
2064 #define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
2065 #define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
2066
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2067 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2068 unsigned long arg)
2069 {
2070 struct dvb_device *dvbdev = file->private_data;
2071 struct dvb_frontend *fe = dvbdev->priv;
2072 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2073 int i, err = 0;
2074
2075 if (cmd == COMPAT_FE_SET_PROPERTY) {
2076 struct compat_dtv_properties prop, *tvps = NULL;
2077 struct compat_dtv_property *tvp = NULL;
2078
2079 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2080 return -EFAULT;
2081
2082 tvps = ∝
2083
2084 /*
2085 * Put an arbitrary limit on the number of messages that can
2086 * be sent at once
2087 */
2088 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2089 return -EINVAL;
2090
2091 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2092 if (IS_ERR(tvp))
2093 return PTR_ERR(tvp);
2094
2095 for (i = 0; i < tvps->num; i++) {
2096 err = dtv_property_process_set(fe, file,
2097 (tvp + i)->cmd,
2098 (tvp + i)->u.data);
2099 if (err < 0) {
2100 kfree(tvp);
2101 return err;
2102 }
2103 }
2104 kfree(tvp);
2105 } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2106 struct compat_dtv_properties prop, *tvps = NULL;
2107 struct compat_dtv_property *tvp = NULL;
2108 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2109
2110 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2111 return -EFAULT;
2112
2113 tvps = ∝
2114
2115 /*
2116 * Put an arbitrary limit on the number of messages that can
2117 * be sent at once
2118 */
2119 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2120 return -EINVAL;
2121
2122 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2123 if (IS_ERR(tvp))
2124 return PTR_ERR(tvp);
2125
2126 /*
2127 * Let's use our own copy of property cache, in order to
2128 * avoid mangling with DTV zigzag logic, as drivers might
2129 * return crap, if they don't check if the data is available
2130 * before updating the properties cache.
2131 */
2132 if (fepriv->state != FESTATE_IDLE) {
2133 err = dtv_get_frontend(fe, &getp, NULL);
2134 if (err < 0) {
2135 kfree(tvp);
2136 return err;
2137 }
2138 }
2139 for (i = 0; i < tvps->num; i++) {
2140 err = dtv_property_process_get(
2141 fe, &getp, (struct dtv_property *)(tvp + i), file);
2142 if (err < 0) {
2143 kfree(tvp);
2144 return err;
2145 }
2146 }
2147
2148 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2149 tvps->num * sizeof(struct compat_dtv_property))) {
2150 kfree(tvp);
2151 return -EFAULT;
2152 }
2153 kfree(tvp);
2154 }
2155
2156 return err;
2157 }
2158
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2159 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2160 unsigned long arg)
2161 {
2162 struct dvb_device *dvbdev = file->private_data;
2163 struct dvb_frontend *fe = dvbdev->priv;
2164 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2165 int err;
2166
2167 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2168 if (down_interruptible(&fepriv->sem))
2169 return -ERESTARTSYS;
2170
2171 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2172
2173 up(&fepriv->sem);
2174 return err;
2175 }
2176
2177 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2178 }
2179 #endif
2180
dtv_set_frontend(struct dvb_frontend * fe)2181 static int dtv_set_frontend(struct dvb_frontend *fe)
2182 {
2183 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2184 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2185 struct dvb_frontend_tune_settings fetunesettings;
2186 u32 rolloff = 0;
2187
2188 if (dvb_frontend_check_parameters(fe) < 0)
2189 return -EINVAL;
2190
2191 /*
2192 * Initialize output parameters to match the values given by
2193 * the user. FE_SET_FRONTEND triggers an initial frontend event
2194 * with status = 0, which copies output parameters to userspace.
2195 */
2196 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2197
2198 /*
2199 * Be sure that the bandwidth will be filled for all
2200 * non-satellite systems, as tuners need to know what
2201 * low pass/Nyquist half filter should be applied, in
2202 * order to avoid inter-channel noise.
2203 *
2204 * ISDB-T and DVB-T/T2 already sets bandwidth.
2205 * ATSC and DVB-C don't set, so, the core should fill it.
2206 *
2207 * On DVB-C Annex A and C, the bandwidth is a function of
2208 * the roll-off and symbol rate. Annex B defines different
2209 * roll-off factors depending on the modulation. Fortunately,
2210 * Annex B is only used with 6MHz, so there's no need to
2211 * calculate it.
2212 *
2213 * While not officially supported, a side effect of handling it at
2214 * the cache level is that a program could retrieve the bandwidth
2215 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2216 */
2217 switch (c->delivery_system) {
2218 case SYS_ATSC:
2219 case SYS_DVBC_ANNEX_B:
2220 c->bandwidth_hz = 6000000;
2221 break;
2222 case SYS_DVBC_ANNEX_A:
2223 rolloff = 115;
2224 break;
2225 case SYS_DVBC_ANNEX_C:
2226 rolloff = 113;
2227 break;
2228 case SYS_DVBS:
2229 case SYS_TURBO:
2230 case SYS_ISDBS:
2231 rolloff = 135;
2232 break;
2233 case SYS_DVBS2:
2234 switch (c->rolloff) {
2235 case ROLLOFF_20:
2236 rolloff = 120;
2237 break;
2238 case ROLLOFF_25:
2239 rolloff = 125;
2240 break;
2241 default:
2242 case ROLLOFF_35:
2243 rolloff = 135;
2244 }
2245 break;
2246 default:
2247 break;
2248 }
2249 if (rolloff)
2250 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2251
2252 /* force auto frequency inversion if requested */
2253 if (dvb_force_auto_inversion)
2254 c->inversion = INVERSION_AUTO;
2255
2256 /*
2257 * without hierarchical coding code_rate_LP is irrelevant,
2258 * so we tolerate the otherwise invalid FEC_NONE setting
2259 */
2260 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2261 c->code_rate_LP = FEC_AUTO;
2262
2263 /* get frontend-specific tuning settings */
2264 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2265 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2266 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2267 fepriv->max_drift = fetunesettings.max_drift;
2268 fepriv->step_size = fetunesettings.step_size;
2269 } else {
2270 /* default values */
2271 switch (c->delivery_system) {
2272 case SYS_DVBS:
2273 case SYS_DVBS2:
2274 case SYS_ISDBS:
2275 case SYS_TURBO:
2276 case SYS_DVBC_ANNEX_A:
2277 case SYS_DVBC_ANNEX_C:
2278 fepriv->min_delay = HZ / 20;
2279 fepriv->step_size = c->symbol_rate / 16000;
2280 fepriv->max_drift = c->symbol_rate / 2000;
2281 break;
2282 case SYS_DVBT:
2283 case SYS_DVBT2:
2284 case SYS_ISDBT:
2285 case SYS_DTMB:
2286 fepriv->min_delay = HZ / 20;
2287 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
2288 fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
2289 break;
2290 default:
2291 /*
2292 * FIXME: This sounds wrong! if freqency_stepsize is
2293 * defined by the frontend, why not use it???
2294 */
2295 fepriv->min_delay = HZ / 20;
2296 fepriv->step_size = 0; /* no zigzag */
2297 fepriv->max_drift = 0;
2298 break;
2299 }
2300 }
2301 if (dvb_override_tune_delay > 0)
2302 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2303
2304 fepriv->state = FESTATE_RETUNE;
2305
2306 /* Request the search algorithm to search */
2307 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2308
2309 dvb_frontend_clear_events(fe);
2310 dvb_frontend_add_event(fe, 0);
2311 dvb_frontend_wakeup(fe);
2312 fepriv->status = 0;
2313
2314 return 0;
2315 }
2316
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2317 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2318 struct dtv_properties *tvps)
2319 {
2320 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2321 struct dtv_property *tvp = NULL;
2322 struct dtv_frontend_properties getp;
2323 int i, err;
2324
2325 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2326
2327 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2328 __func__, tvps->num);
2329 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2330 __func__, tvps->props);
2331
2332 /*
2333 * Put an arbitrary limit on the number of messages that can
2334 * be sent at once
2335 */
2336 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2337 return -EINVAL;
2338
2339 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2340 if (IS_ERR(tvp))
2341 return PTR_ERR(tvp);
2342
2343 /*
2344 * Let's use our own copy of property cache, in order to
2345 * avoid mangling with DTV zigzag logic, as drivers might
2346 * return crap, if they don't check if the data is available
2347 * before updating the properties cache.
2348 */
2349 if (fepriv->state != FESTATE_IDLE) {
2350 err = dtv_get_frontend(fe, &getp, NULL);
2351 if (err < 0)
2352 goto out;
2353 }
2354 for (i = 0; i < tvps->num; i++) {
2355 err = dtv_property_process_get(fe, &getp,
2356 tvp + i, file);
2357 if (err < 0)
2358 goto out;
2359 }
2360
2361 if (copy_to_user((void __user *)tvps->props, tvp,
2362 tvps->num * sizeof(struct dtv_property))) {
2363 err = -EFAULT;
2364 goto out;
2365 }
2366
2367 err = 0;
2368 out:
2369 kfree(tvp);
2370 return err;
2371 }
2372
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2373 static int dvb_get_frontend(struct dvb_frontend *fe,
2374 struct dvb_frontend_parameters *p_out)
2375 {
2376 struct dtv_frontend_properties getp;
2377
2378 /*
2379 * Let's use our own copy of property cache, in order to
2380 * avoid mangling with DTV zigzag logic, as drivers might
2381 * return crap, if they don't check if the data is available
2382 * before updating the properties cache.
2383 */
2384 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2385
2386 return dtv_get_frontend(fe, &getp, p_out);
2387 }
2388
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2389 static int dvb_frontend_handle_ioctl(struct file *file,
2390 unsigned int cmd, void *parg)
2391 {
2392 struct dvb_device *dvbdev = file->private_data;
2393 struct dvb_frontend *fe = dvbdev->priv;
2394 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2395 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2396 int i, err = -ENOTSUPP;
2397
2398 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2399
2400 switch (cmd) {
2401 case FE_SET_PROPERTY: {
2402 struct dtv_properties *tvps = parg;
2403 struct dtv_property *tvp = NULL;
2404
2405 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2406 __func__, tvps->num);
2407 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2408 __func__, tvps->props);
2409
2410 /*
2411 * Put an arbitrary limit on the number of messages that can
2412 * be sent at once
2413 */
2414 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2415 return -EINVAL;
2416
2417 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2418 if (IS_ERR(tvp))
2419 return PTR_ERR(tvp);
2420
2421 for (i = 0; i < tvps->num; i++) {
2422 err = dtv_property_process_set(fe, file,
2423 (tvp + i)->cmd,
2424 (tvp + i)->u.data);
2425 if (err < 0) {
2426 kfree(tvp);
2427 return err;
2428 }
2429 }
2430 kfree(tvp);
2431 err = 0;
2432 break;
2433 }
2434 case FE_GET_PROPERTY:
2435 err = dvb_get_property(fe, file, parg);
2436 break;
2437
2438 case FE_GET_INFO: {
2439 struct dvb_frontend_info *info = parg;
2440 memset(info, 0, sizeof(*info));
2441
2442 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2443 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2444 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2445 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2446 info->caps = fe->ops.info.caps;
2447 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2448 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2449 &info->frequency_max,
2450 &info->frequency_tolerance);
2451
2452 /*
2453 * Associate the 4 delivery systems supported by DVBv3
2454 * API with their DVBv5 counterpart. For the other standards,
2455 * use the closest type, assuming that it would hopefully
2456 * work with a DVBv3 application.
2457 * It should be noticed that, on multi-frontend devices with
2458 * different types (terrestrial and cable, for example),
2459 * a pure DVBv3 application won't be able to use all delivery
2460 * systems. Yet, changing the DVBv5 cache to the other delivery
2461 * system should be enough for making it work.
2462 */
2463 switch (dvbv3_type(c->delivery_system)) {
2464 case DVBV3_QPSK:
2465 info->type = FE_QPSK;
2466 break;
2467 case DVBV3_ATSC:
2468 info->type = FE_ATSC;
2469 break;
2470 case DVBV3_QAM:
2471 info->type = FE_QAM;
2472 break;
2473 case DVBV3_OFDM:
2474 info->type = FE_OFDM;
2475 break;
2476 default:
2477 dev_err(fe->dvb->device,
2478 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2479 __func__, c->delivery_system);
2480 info->type = FE_OFDM;
2481 }
2482 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2483 __func__, c->delivery_system, info->type);
2484
2485 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2486 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2487 info->caps |= FE_CAN_INVERSION_AUTO;
2488 err = 0;
2489 break;
2490 }
2491
2492 case FE_READ_STATUS: {
2493 enum fe_status *status = parg;
2494
2495 /* if retune was requested but hasn't occurred yet, prevent
2496 * that user get signal state from previous tuning */
2497 if (fepriv->state == FESTATE_RETUNE ||
2498 fepriv->state == FESTATE_ERROR) {
2499 err = 0;
2500 *status = 0;
2501 break;
2502 }
2503
2504 if (fe->ops.read_status)
2505 err = fe->ops.read_status(fe, status);
2506 break;
2507 }
2508
2509 case FE_DISEQC_RESET_OVERLOAD:
2510 if (fe->ops.diseqc_reset_overload) {
2511 err = fe->ops.diseqc_reset_overload(fe);
2512 fepriv->state = FESTATE_DISEQC;
2513 fepriv->status = 0;
2514 }
2515 break;
2516
2517 case FE_DISEQC_SEND_MASTER_CMD:
2518 if (fe->ops.diseqc_send_master_cmd) {
2519 struct dvb_diseqc_master_cmd *cmd = parg;
2520
2521 if (cmd->msg_len > sizeof(cmd->msg)) {
2522 err = -EINVAL;
2523 break;
2524 }
2525 err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2526 fepriv->state = FESTATE_DISEQC;
2527 fepriv->status = 0;
2528 }
2529 break;
2530
2531 case FE_DISEQC_SEND_BURST:
2532 if (fe->ops.diseqc_send_burst) {
2533 err = fe->ops.diseqc_send_burst(fe,
2534 (enum fe_sec_mini_cmd)parg);
2535 fepriv->state = FESTATE_DISEQC;
2536 fepriv->status = 0;
2537 }
2538 break;
2539
2540 case FE_SET_TONE:
2541 if (fe->ops.set_tone) {
2542 err = fe->ops.set_tone(fe,
2543 (enum fe_sec_tone_mode)parg);
2544 fepriv->tone = (enum fe_sec_tone_mode)parg;
2545 fepriv->state = FESTATE_DISEQC;
2546 fepriv->status = 0;
2547 }
2548 break;
2549
2550 case FE_SET_VOLTAGE:
2551 if (fe->ops.set_voltage) {
2552 err = fe->ops.set_voltage(fe,
2553 (enum fe_sec_voltage)parg);
2554 fepriv->voltage = (enum fe_sec_voltage)parg;
2555 fepriv->state = FESTATE_DISEQC;
2556 fepriv->status = 0;
2557 }
2558 break;
2559
2560 case FE_DISEQC_RECV_SLAVE_REPLY:
2561 if (fe->ops.diseqc_recv_slave_reply)
2562 err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2563 break;
2564
2565 case FE_ENABLE_HIGH_LNB_VOLTAGE:
2566 if (fe->ops.enable_high_lnb_voltage)
2567 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2568 break;
2569
2570 case FE_SET_FRONTEND_TUNE_MODE:
2571 fepriv->tune_mode_flags = (unsigned long)parg;
2572 err = 0;
2573 break;
2574 /* DEPRECATED dish control ioctls */
2575
2576 case FE_DISHNETWORK_SEND_LEGACY_CMD:
2577 if (fe->ops.dishnetwork_send_legacy_command) {
2578 err = fe->ops.dishnetwork_send_legacy_command(fe,
2579 (unsigned long)parg);
2580 fepriv->state = FESTATE_DISEQC;
2581 fepriv->status = 0;
2582 } else if (fe->ops.set_voltage) {
2583 /*
2584 * NOTE: This is a fallback condition. Some frontends
2585 * (stv0299 for instance) take longer than 8msec to
2586 * respond to a set_voltage command. Those switches
2587 * need custom routines to switch properly. For all
2588 * other frontends, the following should work ok.
2589 * Dish network legacy switches (as used by Dish500)
2590 * are controlled by sending 9-bit command words
2591 * spaced 8msec apart.
2592 * the actual command word is switch/port dependent
2593 * so it is up to the userspace application to send
2594 * the right command.
2595 * The command must always start with a '0' after
2596 * initialization, so parg is 8 bits and does not
2597 * include the initialization or start bit
2598 */
2599 unsigned long swcmd = ((unsigned long)parg) << 1;
2600 ktime_t nexttime;
2601 ktime_t tv[10];
2602 int i;
2603 u8 last = 1;
2604
2605 if (dvb_frontend_debug)
2606 dprintk("switch command: 0x%04lx\n",
2607 swcmd);
2608 nexttime = ktime_get_boottime();
2609 if (dvb_frontend_debug)
2610 tv[0] = nexttime;
2611 /* before sending a command, initialize by sending
2612 * a 32ms 18V to the switch
2613 */
2614 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2615 dvb_frontend_sleep_until(&nexttime, 32000);
2616
2617 for (i = 0; i < 9; i++) {
2618 if (dvb_frontend_debug)
2619 tv[i + 1] = ktime_get_boottime();
2620 if ((swcmd & 0x01) != last) {
2621 /* set voltage to (last ? 13V : 18V) */
2622 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2623 last = (last) ? 0 : 1;
2624 }
2625 swcmd = swcmd >> 1;
2626 if (i != 8)
2627 dvb_frontend_sleep_until(&nexttime, 8000);
2628 }
2629 if (dvb_frontend_debug) {
2630 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2631 fe->dvb->num);
2632 for (i = 1; i < 10; i++)
2633 pr_info("%d: %d\n", i,
2634 (int)ktime_us_delta(tv[i], tv[i - 1]));
2635 }
2636 err = 0;
2637 fepriv->state = FESTATE_DISEQC;
2638 fepriv->status = 0;
2639 }
2640 break;
2641
2642 /* DEPRECATED statistics ioctls */
2643
2644 case FE_READ_BER:
2645 if (fe->ops.read_ber) {
2646 if (fepriv->thread)
2647 err = fe->ops.read_ber(fe, parg);
2648 else
2649 err = -EAGAIN;
2650 }
2651 break;
2652
2653 case FE_READ_SIGNAL_STRENGTH:
2654 if (fe->ops.read_signal_strength) {
2655 if (fepriv->thread)
2656 err = fe->ops.read_signal_strength(fe, parg);
2657 else
2658 err = -EAGAIN;
2659 }
2660 break;
2661
2662 case FE_READ_SNR:
2663 if (fe->ops.read_snr) {
2664 if (fepriv->thread)
2665 err = fe->ops.read_snr(fe, parg);
2666 else
2667 err = -EAGAIN;
2668 }
2669 break;
2670
2671 case FE_READ_UNCORRECTED_BLOCKS:
2672 if (fe->ops.read_ucblocks) {
2673 if (fepriv->thread)
2674 err = fe->ops.read_ucblocks(fe, parg);
2675 else
2676 err = -EAGAIN;
2677 }
2678 break;
2679
2680 /* DEPRECATED DVBv3 ioctls */
2681
2682 case FE_SET_FRONTEND:
2683 err = dvbv3_set_delivery_system(fe);
2684 if (err)
2685 break;
2686
2687 err = dtv_property_cache_sync(fe, c, parg);
2688 if (err)
2689 break;
2690 err = dtv_set_frontend(fe);
2691 break;
2692
2693 case FE_GET_EVENT:
2694 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2695 break;
2696
2697 case FE_GET_FRONTEND:
2698 err = dvb_get_frontend(fe, parg);
2699 break;
2700
2701 default:
2702 return -ENOTSUPP;
2703 } /* switch */
2704
2705 return err;
2706 }
2707
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2708 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2709 {
2710 struct dvb_device *dvbdev = file->private_data;
2711 struct dvb_frontend *fe = dvbdev->priv;
2712 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2713
2714 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2715
2716 poll_wait(file, &fepriv->events.wait_queue, wait);
2717
2718 if (fepriv->events.eventw != fepriv->events.eventr)
2719 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2720
2721 return 0;
2722 }
2723
dvb_frontend_open(struct inode * inode,struct file * file)2724 static int dvb_frontend_open(struct inode *inode, struct file *file)
2725 {
2726 struct dvb_device *dvbdev = file->private_data;
2727 struct dvb_frontend *fe = dvbdev->priv;
2728 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2729 struct dvb_adapter *adapter = fe->dvb;
2730 int ret;
2731
2732 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2733 if (fe->exit == DVB_FE_DEVICE_REMOVED)
2734 return -ENODEV;
2735
2736 if (adapter->mfe_shared) {
2737 mutex_lock(&adapter->mfe_lock);
2738
2739 if (!adapter->mfe_dvbdev)
2740 adapter->mfe_dvbdev = dvbdev;
2741
2742 else if (adapter->mfe_dvbdev != dvbdev) {
2743 struct dvb_device
2744 *mfedev = adapter->mfe_dvbdev;
2745 struct dvb_frontend
2746 *mfe = mfedev->priv;
2747 struct dvb_frontend_private
2748 *mfepriv = mfe->frontend_priv;
2749 int mferetry = (dvb_mfe_wait_time << 1);
2750
2751 mutex_unlock(&adapter->mfe_lock);
2752 while (mferetry-- && (mfedev->users != -1 ||
2753 mfepriv->thread)) {
2754 if (msleep_interruptible(500)) {
2755 if (signal_pending(current))
2756 return -EINTR;
2757 }
2758 }
2759
2760 mutex_lock(&adapter->mfe_lock);
2761 if (adapter->mfe_dvbdev != dvbdev) {
2762 mfedev = adapter->mfe_dvbdev;
2763 mfe = mfedev->priv;
2764 mfepriv = mfe->frontend_priv;
2765 if (mfedev->users != -1 ||
2766 mfepriv->thread) {
2767 mutex_unlock(&adapter->mfe_lock);
2768 return -EBUSY;
2769 }
2770 adapter->mfe_dvbdev = dvbdev;
2771 }
2772 }
2773 }
2774
2775 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2776 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2777 goto err0;
2778
2779 /* If we took control of the bus, we need to force
2780 reinitialization. This is because many ts_bus_ctrl()
2781 functions strobe the RESET pin on the demod, and if the
2782 frontend thread already exists then the dvb_init() routine
2783 won't get called (which is what usually does initial
2784 register configuration). */
2785 fepriv->reinitialise = 1;
2786 }
2787
2788 if ((ret = dvb_generic_open(inode, file)) < 0)
2789 goto err1;
2790
2791 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2792 /* normal tune mode when opened R/W */
2793 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2794 fepriv->tone = -1;
2795 fepriv->voltage = -1;
2796
2797 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2798 mutex_lock(&fe->dvb->mdev_lock);
2799 if (fe->dvb->mdev) {
2800 mutex_lock(&fe->dvb->mdev->graph_mutex);
2801 if (fe->dvb->mdev->enable_source)
2802 ret = fe->dvb->mdev->enable_source(
2803 dvbdev->entity,
2804 &fepriv->pipe);
2805 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2806 if (ret) {
2807 mutex_unlock(&fe->dvb->mdev_lock);
2808 dev_err(fe->dvb->device,
2809 "Tuner is busy. Error %d\n", ret);
2810 goto err2;
2811 }
2812 }
2813 mutex_unlock(&fe->dvb->mdev_lock);
2814 #endif
2815 ret = dvb_frontend_start(fe);
2816 if (ret)
2817 goto err3;
2818
2819 /* empty event queue */
2820 fepriv->events.eventr = fepriv->events.eventw = 0;
2821 }
2822
2823 dvb_frontend_get(fe);
2824
2825 if (adapter->mfe_shared)
2826 mutex_unlock(&adapter->mfe_lock);
2827 return ret;
2828
2829 err3:
2830 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2831 mutex_lock(&fe->dvb->mdev_lock);
2832 if (fe->dvb->mdev) {
2833 mutex_lock(&fe->dvb->mdev->graph_mutex);
2834 if (fe->dvb->mdev->disable_source)
2835 fe->dvb->mdev->disable_source(dvbdev->entity);
2836 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2837 }
2838 mutex_unlock(&fe->dvb->mdev_lock);
2839 err2:
2840 #endif
2841 dvb_generic_release(inode, file);
2842 err1:
2843 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2844 fe->ops.ts_bus_ctrl(fe, 0);
2845 err0:
2846 if (adapter->mfe_shared)
2847 mutex_unlock(&adapter->mfe_lock);
2848 return ret;
2849 }
2850
dvb_frontend_release(struct inode * inode,struct file * file)2851 static int dvb_frontend_release(struct inode *inode, struct file *file)
2852 {
2853 struct dvb_device *dvbdev = file->private_data;
2854 struct dvb_frontend *fe = dvbdev->priv;
2855 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2856 int ret;
2857
2858 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2859
2860 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2861 fepriv->release_jiffies = jiffies;
2862 mb();
2863 }
2864
2865 ret = dvb_generic_release(inode, file);
2866
2867 if (dvbdev->users == -1) {
2868 wake_up(&fepriv->wait_queue);
2869 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2870 mutex_lock(&fe->dvb->mdev_lock);
2871 if (fe->dvb->mdev) {
2872 mutex_lock(&fe->dvb->mdev->graph_mutex);
2873 if (fe->dvb->mdev->disable_source)
2874 fe->dvb->mdev->disable_source(dvbdev->entity);
2875 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2876 }
2877 mutex_unlock(&fe->dvb->mdev_lock);
2878 #endif
2879 if (fe->exit != DVB_FE_NO_EXIT)
2880 wake_up(&dvbdev->wait_queue);
2881 if (fe->ops.ts_bus_ctrl)
2882 fe->ops.ts_bus_ctrl(fe, 0);
2883 }
2884
2885 dvb_frontend_put(fe);
2886
2887 return ret;
2888 }
2889
2890 static const struct file_operations dvb_frontend_fops = {
2891 .owner = THIS_MODULE,
2892 .unlocked_ioctl = dvb_frontend_ioctl,
2893 #ifdef CONFIG_COMPAT
2894 .compat_ioctl = dvb_frontend_compat_ioctl,
2895 #endif
2896 .poll = dvb_frontend_poll,
2897 .open = dvb_frontend_open,
2898 .release = dvb_frontend_release,
2899 .llseek = noop_llseek,
2900 };
2901
dvb_frontend_suspend(struct dvb_frontend * fe)2902 int dvb_frontend_suspend(struct dvb_frontend *fe)
2903 {
2904 int ret = 0;
2905
2906 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2907 fe->id);
2908
2909 if (fe->ops.tuner_ops.suspend)
2910 ret = fe->ops.tuner_ops.suspend(fe);
2911 else if (fe->ops.tuner_ops.sleep)
2912 ret = fe->ops.tuner_ops.sleep(fe);
2913
2914 if (fe->ops.sleep)
2915 ret = fe->ops.sleep(fe);
2916
2917 return ret;
2918 }
2919 EXPORT_SYMBOL(dvb_frontend_suspend);
2920
dvb_frontend_resume(struct dvb_frontend * fe)2921 int dvb_frontend_resume(struct dvb_frontend *fe)
2922 {
2923 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2924 int ret = 0;
2925
2926 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2927 fe->id);
2928
2929 fe->exit = DVB_FE_DEVICE_RESUME;
2930 if (fe->ops.init)
2931 ret = fe->ops.init(fe);
2932
2933 if (fe->ops.tuner_ops.resume)
2934 ret = fe->ops.tuner_ops.resume(fe);
2935 else if (fe->ops.tuner_ops.init)
2936 ret = fe->ops.tuner_ops.init(fe);
2937
2938 if (fe->ops.set_tone && fepriv->tone != -1)
2939 fe->ops.set_tone(fe, fepriv->tone);
2940 if (fe->ops.set_voltage && fepriv->voltage != -1)
2941 fe->ops.set_voltage(fe, fepriv->voltage);
2942
2943 fe->exit = DVB_FE_NO_EXIT;
2944 fepriv->state = FESTATE_RETUNE;
2945 dvb_frontend_wakeup(fe);
2946
2947 return ret;
2948 }
2949 EXPORT_SYMBOL(dvb_frontend_resume);
2950
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)2951 int dvb_register_frontend(struct dvb_adapter *dvb,
2952 struct dvb_frontend *fe)
2953 {
2954 struct dvb_frontend_private *fepriv;
2955 const struct dvb_device dvbdev_template = {
2956 .users = ~0,
2957 .writers = 1,
2958 .readers = (~0) - 1,
2959 .fops = &dvb_frontend_fops,
2960 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2961 .name = fe->ops.info.name,
2962 #endif
2963 };
2964
2965 dev_dbg(dvb->device, "%s:\n", __func__);
2966
2967 if (mutex_lock_interruptible(&frontend_mutex))
2968 return -ERESTARTSYS;
2969
2970 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2971 if (!fe->frontend_priv) {
2972 mutex_unlock(&frontend_mutex);
2973 return -ENOMEM;
2974 }
2975 fepriv = fe->frontend_priv;
2976
2977 kref_init(&fe->refcount);
2978
2979 /*
2980 * After initialization, there need to be two references: one
2981 * for dvb_unregister_frontend(), and another one for
2982 * dvb_frontend_detach().
2983 */
2984 dvb_frontend_get(fe);
2985
2986 sema_init(&fepriv->sem, 1);
2987 init_waitqueue_head(&fepriv->wait_queue);
2988 init_waitqueue_head(&fepriv->events.wait_queue);
2989 mutex_init(&fepriv->events.mtx);
2990 fe->dvb = dvb;
2991 fepriv->inversion = INVERSION_OFF;
2992
2993 dev_info(fe->dvb->device,
2994 "DVB: registering adapter %i frontend %i (%s)...\n",
2995 fe->dvb->num, fe->id, fe->ops.info.name);
2996
2997 dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
2998 fe, DVB_DEVICE_FRONTEND, 0);
2999
3000 /*
3001 * Initialize the cache to the proper values according with the
3002 * first supported delivery system (ops->delsys[0])
3003 */
3004
3005 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3006 dvb_frontend_clear_cache(fe);
3007
3008 mutex_unlock(&frontend_mutex);
3009 return 0;
3010 }
3011 EXPORT_SYMBOL(dvb_register_frontend);
3012
dvb_unregister_frontend(struct dvb_frontend * fe)3013 int dvb_unregister_frontend(struct dvb_frontend *fe)
3014 {
3015 struct dvb_frontend_private *fepriv = fe->frontend_priv;
3016
3017 dev_dbg(fe->dvb->device, "%s:\n", __func__);
3018
3019 mutex_lock(&frontend_mutex);
3020 dvb_frontend_stop(fe);
3021 dvb_remove_device(fepriv->dvbdev);
3022
3023 /* fe is invalid now */
3024 mutex_unlock(&frontend_mutex);
3025 dvb_frontend_put(fe);
3026 return 0;
3027 }
3028 EXPORT_SYMBOL(dvb_unregister_frontend);
3029
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3030 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3031 void (*release)(struct dvb_frontend *fe))
3032 {
3033 if (release) {
3034 release(fe);
3035 #ifdef CONFIG_MEDIA_ATTACH
3036 dvb_detach(release);
3037 #endif
3038 }
3039 }
3040
dvb_frontend_detach(struct dvb_frontend * fe)3041 void dvb_frontend_detach(struct dvb_frontend *fe)
3042 {
3043 dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3044 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3045 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3046 dvb_frontend_put(fe);
3047 }
3048 EXPORT_SYMBOL(dvb_frontend_detach);
3049
