1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dvb_frontend.c: DVB frontend tuning interface/thread
4 *
5 * Copyright (C) 1999-2001 Ralph Metzler
6 * Marcus Metzler
7 * Holger Waechtler
8 * for convergence integrated media GmbH
9 *
10 * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11 */
12
13 /* Enables DVBv3 compatibility bits at the headers */
14 #define __DVB_CORE__
15
16 #define pr_fmt(fmt) "dvb_frontend: " fmt
17
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/wait.h>
22 #include <linux/slab.h>
23 #include <linux/poll.h>
24 #include <linux/semaphore.h>
25 #include <linux/module.h>
26 #include <linux/nospec.h>
27 #include <linux/list.h>
28 #include <linux/freezer.h>
29 #include <linux/jiffies.h>
30 #include <linux/kthread.h>
31 #include <linux/ktime.h>
32 #include <linux/compat.h>
33 #include <asm/processor.h>
34
35 #include <media/dvb_frontend.h>
36 #include <media/dvbdev.h>
37 #include <linux/dvb/version.h>
38
39 static int dvb_frontend_debug;
40 static int dvb_shutdown_timeout;
41 static int dvb_force_auto_inversion;
42 static int dvb_override_tune_delay;
43 static int dvb_powerdown_on_sleep = 1;
44 static int dvb_mfe_wait_time = 5;
45
46 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
47 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
48 module_param(dvb_shutdown_timeout, int, 0644);
49 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
50 module_param(dvb_force_auto_inversion, int, 0644);
51 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
52 module_param(dvb_override_tune_delay, int, 0644);
53 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
54 module_param(dvb_powerdown_on_sleep, int, 0644);
55 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
56 module_param(dvb_mfe_wait_time, int, 0644);
57 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)");
58
59 #define dprintk(fmt, arg...) \
60 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
61
62 #define FESTATE_IDLE 1
63 #define FESTATE_RETUNE 2
64 #define FESTATE_TUNING_FAST 4
65 #define FESTATE_TUNING_SLOW 8
66 #define FESTATE_TUNED 16
67 #define FESTATE_ZIGZAG_FAST 32
68 #define FESTATE_ZIGZAG_SLOW 64
69 #define FESTATE_DISEQC 128
70 #define FESTATE_ERROR 256
71 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
72 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
73 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
74 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
75
76 /*
77 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
78 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
79 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
80 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
81 * FESTATE_TUNED. The frontend has successfully locked on.
82 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
83 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
84 * FESTATE_DISEQC. A DISEQC command has just been issued.
85 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
86 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
87 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
88 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
89 */
90
91 static DEFINE_MUTEX(frontend_mutex);
92
93 struct dvb_frontend_private {
94 /* thread/frontend values */
95 struct dvb_device *dvbdev;
96 struct dvb_frontend_parameters parameters_out;
97 struct dvb_fe_events events;
98 struct semaphore sem;
99 struct list_head list_head;
100 wait_queue_head_t wait_queue;
101 struct task_struct *thread;
102 unsigned long release_jiffies;
103 unsigned int wakeup;
104 enum fe_status status;
105 unsigned long tune_mode_flags;
106 unsigned int delay;
107 unsigned int reinitialise;
108 int tone;
109 int voltage;
110
111 /* swzigzag values */
112 unsigned int state;
113 unsigned int bending;
114 int lnb_drift;
115 unsigned int inversion;
116 unsigned int auto_step;
117 unsigned int auto_sub_step;
118 unsigned int started_auto_step;
119 unsigned int min_delay;
120 unsigned int max_drift;
121 unsigned int step_size;
122 int quality;
123 unsigned int check_wrapped;
124 enum dvbfe_search algo_status;
125
126 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
127 struct media_pipeline pipe;
128 #endif
129 };
130
131 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
132 void (*release)(struct dvb_frontend *fe));
133
__dvb_frontend_free(struct dvb_frontend * fe)134 static void __dvb_frontend_free(struct dvb_frontend *fe)
135 {
136 struct dvb_frontend_private *fepriv = fe->frontend_priv;
137
138 if (fepriv)
139 dvb_device_put(fepriv->dvbdev);
140
141 dvb_frontend_invoke_release(fe, fe->ops.release);
142
143 kfree(fepriv);
144 }
145
dvb_frontend_free(struct kref * ref)146 static void dvb_frontend_free(struct kref *ref)
147 {
148 struct dvb_frontend *fe =
149 container_of(ref, struct dvb_frontend, refcount);
150
151 __dvb_frontend_free(fe);
152 }
153
dvb_frontend_put(struct dvb_frontend * fe)154 static void dvb_frontend_put(struct dvb_frontend *fe)
155 {
156 /* call detach before dropping the reference count */
157 if (fe->ops.detach)
158 fe->ops.detach(fe);
159 /*
160 * Check if the frontend was registered, as otherwise
161 * kref was not initialized yet.
162 */
163 if (fe->frontend_priv)
164 kref_put(&fe->refcount, dvb_frontend_free);
165 else
166 __dvb_frontend_free(fe);
167 }
168
dvb_frontend_get(struct dvb_frontend * fe)169 static void dvb_frontend_get(struct dvb_frontend *fe)
170 {
171 kref_get(&fe->refcount);
172 }
173
174 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
175 static int dtv_get_frontend(struct dvb_frontend *fe,
176 struct dtv_frontend_properties *c,
177 struct dvb_frontend_parameters *p_out);
178 static int
179 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
180 const struct dtv_frontend_properties *c,
181 struct dvb_frontend_parameters *p);
182
has_get_frontend(struct dvb_frontend * fe)183 static bool has_get_frontend(struct dvb_frontend *fe)
184 {
185 return fe->ops.get_frontend;
186 }
187
188 /*
189 * Due to DVBv3 API calls, a delivery system should be mapped into one of
190 * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
191 * otherwise, a DVBv3 call will fail.
192 */
193 enum dvbv3_emulation_type {
194 DVBV3_UNKNOWN,
195 DVBV3_QPSK,
196 DVBV3_QAM,
197 DVBV3_OFDM,
198 DVBV3_ATSC,
199 };
200
dvbv3_type(u32 delivery_system)201 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
202 {
203 switch (delivery_system) {
204 case SYS_DVBC_ANNEX_A:
205 case SYS_DVBC_ANNEX_C:
206 return DVBV3_QAM;
207 case SYS_DVBS:
208 case SYS_DVBS2:
209 case SYS_TURBO:
210 case SYS_ISDBS:
211 case SYS_DSS:
212 return DVBV3_QPSK;
213 case SYS_DVBT:
214 case SYS_DVBT2:
215 case SYS_ISDBT:
216 case SYS_DTMB:
217 return DVBV3_OFDM;
218 case SYS_ATSC:
219 case SYS_ATSCMH:
220 case SYS_DVBC_ANNEX_B:
221 return DVBV3_ATSC;
222 case SYS_UNDEFINED:
223 case SYS_ISDBC:
224 case SYS_DVBH:
225 case SYS_DAB:
226 default:
227 /*
228 * Doesn't know how to emulate those types and/or
229 * there's no frontend driver from this type yet
230 * with some emulation code, so, we're not sure yet how
231 * to handle them, or they're not compatible with a DVBv3 call.
232 */
233 return DVBV3_UNKNOWN;
234 }
235 }
236
dvb_frontend_add_event(struct dvb_frontend * fe,enum fe_status status)237 static void dvb_frontend_add_event(struct dvb_frontend *fe,
238 enum fe_status status)
239 {
240 struct dvb_frontend_private *fepriv = fe->frontend_priv;
241 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
242 struct dvb_fe_events *events = &fepriv->events;
243 struct dvb_frontend_event *e;
244 int wp;
245
246 dev_dbg(fe->dvb->device, "%s:\n", __func__);
247
248 if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
249 dtv_get_frontend(fe, c, &fepriv->parameters_out);
250
251 mutex_lock(&events->mtx);
252
253 wp = (events->eventw + 1) % MAX_EVENT;
254 if (wp == events->eventr) {
255 events->overflow = 1;
256 events->eventr = (events->eventr + 1) % MAX_EVENT;
257 }
258
259 e = &events->events[events->eventw];
260 e->status = status;
261 e->parameters = fepriv->parameters_out;
262
263 events->eventw = wp;
264
265 mutex_unlock(&events->mtx);
266
267 wake_up_interruptible(&events->wait_queue);
268 }
269
dvb_frontend_test_event(struct dvb_frontend_private * fepriv,struct dvb_fe_events * events)270 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
271 struct dvb_fe_events *events)
272 {
273 int ret;
274
275 up(&fepriv->sem);
276 ret = events->eventw != events->eventr;
277 down(&fepriv->sem);
278
279 return ret;
280 }
281
dvb_frontend_get_event(struct dvb_frontend * fe,struct dvb_frontend_event * event,int flags)282 static int dvb_frontend_get_event(struct dvb_frontend *fe,
283 struct dvb_frontend_event *event, int flags)
284 {
285 struct dvb_frontend_private *fepriv = fe->frontend_priv;
286 struct dvb_fe_events *events = &fepriv->events;
287
288 dev_dbg(fe->dvb->device, "%s:\n", __func__);
289
290 if (events->overflow) {
291 events->overflow = 0;
292 return -EOVERFLOW;
293 }
294
295 if (events->eventw == events->eventr) {
296 struct wait_queue_entry wait;
297 int ret = 0;
298
299 if (flags & O_NONBLOCK)
300 return -EWOULDBLOCK;
301
302 init_waitqueue_entry(&wait, current);
303 add_wait_queue(&events->wait_queue, &wait);
304 while (!dvb_frontend_test_event(fepriv, events)) {
305 wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
306 if (signal_pending(current)) {
307 ret = -ERESTARTSYS;
308 break;
309 }
310 }
311 remove_wait_queue(&events->wait_queue, &wait);
312 if (ret < 0)
313 return ret;
314 }
315
316 mutex_lock(&events->mtx);
317 *event = events->events[events->eventr];
318 events->eventr = (events->eventr + 1) % MAX_EVENT;
319 mutex_unlock(&events->mtx);
320
321 return 0;
322 }
323
dvb_frontend_clear_events(struct dvb_frontend * fe)324 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
325 {
326 struct dvb_frontend_private *fepriv = fe->frontend_priv;
327 struct dvb_fe_events *events = &fepriv->events;
328
329 mutex_lock(&events->mtx);
330 events->eventr = events->eventw;
331 mutex_unlock(&events->mtx);
332 }
333
dvb_frontend_init(struct dvb_frontend * fe)334 static void dvb_frontend_init(struct dvb_frontend *fe)
335 {
336 dev_dbg(fe->dvb->device,
337 "%s: initialising adapter %i frontend %i (%s)...\n",
338 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
339
340 if (fe->ops.init)
341 fe->ops.init(fe);
342 if (fe->ops.tuner_ops.init) {
343 if (fe->ops.i2c_gate_ctrl)
344 fe->ops.i2c_gate_ctrl(fe, 1);
345 fe->ops.tuner_ops.init(fe);
346 if (fe->ops.i2c_gate_ctrl)
347 fe->ops.i2c_gate_ctrl(fe, 0);
348 }
349 }
350
dvb_frontend_reinitialise(struct dvb_frontend * fe)351 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
352 {
353 struct dvb_frontend_private *fepriv = fe->frontend_priv;
354
355 fepriv->reinitialise = 1;
356 dvb_frontend_wakeup(fe);
357 }
358 EXPORT_SYMBOL(dvb_frontend_reinitialise);
359
dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private * fepriv,int locked)360 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
361 {
362 int q2;
363 struct dvb_frontend *fe = fepriv->dvbdev->priv;
364
365 dev_dbg(fe->dvb->device, "%s:\n", __func__);
366
367 if (locked)
368 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
369 else
370 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
371
372 q2 = fepriv->quality - 128;
373 q2 *= q2;
374
375 fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
376 }
377
378 /**
379 * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
380 * parameters.
381 *
382 * @fe: The frontend concerned.
383 * @check_wrapped: Checks if an iteration has completed.
384 * DO NOT SET ON THE FIRST ATTEMPT.
385 *
386 * return: Number of complete iterations that have been performed.
387 */
dvb_frontend_swzigzag_autotune(struct dvb_frontend * fe,int check_wrapped)388 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
389 {
390 int autoinversion;
391 int ready = 0;
392 int fe_set_err = 0;
393 struct dvb_frontend_private *fepriv = fe->frontend_priv;
394 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
395 int original_inversion = c->inversion;
396 u32 original_frequency = c->frequency;
397
398 /* are we using autoinversion? */
399 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
400 (c->inversion == INVERSION_AUTO));
401
402 /* setup parameters correctly */
403 while (!ready) {
404 /* calculate the lnb_drift */
405 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
406
407 /* wrap the auto_step if we've exceeded the maximum drift */
408 if (fepriv->lnb_drift > fepriv->max_drift) {
409 fepriv->auto_step = 0;
410 fepriv->auto_sub_step = 0;
411 fepriv->lnb_drift = 0;
412 }
413
414 /* perform inversion and +/- zigzag */
415 switch (fepriv->auto_sub_step) {
416 case 0:
417 /* try with the current inversion and current drift setting */
418 ready = 1;
419 break;
420
421 case 1:
422 if (!autoinversion) break;
423
424 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
425 ready = 1;
426 break;
427
428 case 2:
429 if (fepriv->lnb_drift == 0) break;
430
431 fepriv->lnb_drift = -fepriv->lnb_drift;
432 ready = 1;
433 break;
434
435 case 3:
436 if (fepriv->lnb_drift == 0) break;
437 if (!autoinversion) break;
438
439 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
440 fepriv->lnb_drift = -fepriv->lnb_drift;
441 ready = 1;
442 break;
443
444 default:
445 fepriv->auto_step++;
446 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
447 break;
448 }
449
450 if (!ready) fepriv->auto_sub_step++;
451 }
452
453 /* if this attempt would hit where we started, indicate a complete
454 * iteration has occurred */
455 if ((fepriv->auto_step == fepriv->started_auto_step) &&
456 (fepriv->auto_sub_step == 0) && check_wrapped) {
457 return 1;
458 }
459
460 dev_dbg(fe->dvb->device,
461 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
462 __func__, fepriv->lnb_drift, fepriv->inversion,
463 fepriv->auto_step, fepriv->auto_sub_step,
464 fepriv->started_auto_step);
465
466 /* set the frontend itself */
467 c->frequency += fepriv->lnb_drift;
468 if (autoinversion)
469 c->inversion = fepriv->inversion;
470 tmp = *c;
471 if (fe->ops.set_frontend)
472 fe_set_err = fe->ops.set_frontend(fe);
473 *c = tmp;
474 if (fe_set_err < 0) {
475 fepriv->state = FESTATE_ERROR;
476 return fe_set_err;
477 }
478
479 c->frequency = original_frequency;
480 c->inversion = original_inversion;
481
482 fepriv->auto_sub_step++;
483 return 0;
484 }
485
dvb_frontend_swzigzag(struct dvb_frontend * fe)486 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
487 {
488 enum fe_status s = FE_NONE;
489 int retval = 0;
490 struct dvb_frontend_private *fepriv = fe->frontend_priv;
491 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
492
493 if (fepriv->max_drift)
494 dev_warn_once(fe->dvb->device,
495 "Frontend requested software zigzag, but didn't set the frequency step size\n");
496
497 /* if we've got no parameters, just keep idling */
498 if (fepriv->state & FESTATE_IDLE) {
499 fepriv->delay = 3 * HZ;
500 fepriv->quality = 0;
501 return;
502 }
503
504 /* in SCAN mode, we just set the frontend when asked and leave it alone */
505 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
506 if (fepriv->state & FESTATE_RETUNE) {
507 tmp = *c;
508 if (fe->ops.set_frontend)
509 retval = fe->ops.set_frontend(fe);
510 *c = tmp;
511 if (retval < 0)
512 fepriv->state = FESTATE_ERROR;
513 else
514 fepriv->state = FESTATE_TUNED;
515 }
516 fepriv->delay = 3 * HZ;
517 fepriv->quality = 0;
518 return;
519 }
520
521 /* get the frontend status */
522 if (fepriv->state & FESTATE_RETUNE) {
523 s = 0;
524 } else {
525 if (fe->ops.read_status)
526 fe->ops.read_status(fe, &s);
527 if (s != fepriv->status) {
528 dvb_frontend_add_event(fe, s);
529 fepriv->status = s;
530 }
531 }
532
533 /* if we're not tuned, and we have a lock, move to the TUNED state */
534 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
535 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
536 fepriv->state = FESTATE_TUNED;
537
538 /* if we're tuned, then we have determined the correct inversion */
539 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
540 (c->inversion == INVERSION_AUTO)) {
541 c->inversion = fepriv->inversion;
542 }
543 return;
544 }
545
546 /* if we are tuned already, check we're still locked */
547 if (fepriv->state & FESTATE_TUNED) {
548 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
549
550 /* we're tuned, and the lock is still good... */
551 if (s & FE_HAS_LOCK) {
552 return;
553 } else { /* if we _WERE_ tuned, but now don't have a lock */
554 fepriv->state = FESTATE_ZIGZAG_FAST;
555 fepriv->started_auto_step = fepriv->auto_step;
556 fepriv->check_wrapped = 0;
557 }
558 }
559
560 /* don't actually do anything if we're in the LOSTLOCK state,
561 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
562 if ((fepriv->state & FESTATE_LOSTLOCK) &&
563 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
564 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
565 return;
566 }
567
568 /* don't do anything if we're in the DISEQC state, since this
569 * might be someone with a motorized dish controlled by DISEQC.
570 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
571 if (fepriv->state & FESTATE_DISEQC) {
572 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
573 return;
574 }
575
576 /* if we're in the RETUNE state, set everything up for a brand
577 * new scan, keeping the current inversion setting, as the next
578 * tune is _very_ likely to require the same */
579 if (fepriv->state & FESTATE_RETUNE) {
580 fepriv->lnb_drift = 0;
581 fepriv->auto_step = 0;
582 fepriv->auto_sub_step = 0;
583 fepriv->started_auto_step = 0;
584 fepriv->check_wrapped = 0;
585 }
586
587 /* fast zigzag. */
588 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
589 fepriv->delay = fepriv->min_delay;
590
591 /* perform a tune */
592 retval = dvb_frontend_swzigzag_autotune(fe,
593 fepriv->check_wrapped);
594 if (retval < 0) {
595 return;
596 } else if (retval) {
597 /* OK, if we've run out of trials at the fast speed.
598 * Drop back to slow for the _next_ attempt */
599 fepriv->state = FESTATE_SEARCHING_SLOW;
600 fepriv->started_auto_step = fepriv->auto_step;
601 return;
602 }
603 fepriv->check_wrapped = 1;
604
605 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
606 * This ensures we cannot return from an
607 * FE_SET_FRONTEND ioctl before the first frontend tune
608 * occurs */
609 if (fepriv->state & FESTATE_RETUNE) {
610 fepriv->state = FESTATE_TUNING_FAST;
611 }
612 }
613
614 /* slow zigzag */
615 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
616 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
617
618 /* Note: don't bother checking for wrapping; we stay in this
619 * state until we get a lock */
620 dvb_frontend_swzigzag_autotune(fe, 0);
621 }
622 }
623
dvb_frontend_is_exiting(struct dvb_frontend * fe)624 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
625 {
626 struct dvb_frontend_private *fepriv = fe->frontend_priv;
627
628 if (fe->exit != DVB_FE_NO_EXIT)
629 return 1;
630
631 if (fepriv->dvbdev->writers == 1)
632 if (time_after_eq(jiffies, fepriv->release_jiffies +
633 dvb_shutdown_timeout * HZ))
634 return 1;
635
636 return 0;
637 }
638
dvb_frontend_should_wakeup(struct dvb_frontend * fe)639 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
640 {
641 struct dvb_frontend_private *fepriv = fe->frontend_priv;
642
643 if (fepriv->wakeup) {
644 fepriv->wakeup = 0;
645 return 1;
646 }
647 return dvb_frontend_is_exiting(fe);
648 }
649
dvb_frontend_wakeup(struct dvb_frontend * fe)650 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
651 {
652 struct dvb_frontend_private *fepriv = fe->frontend_priv;
653
654 fepriv->wakeup = 1;
655 wake_up_interruptible(&fepriv->wait_queue);
656 }
657
dvb_frontend_thread(void * data)658 static int dvb_frontend_thread(void *data)
659 {
660 struct dvb_frontend *fe = data;
661 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
662 struct dvb_frontend_private *fepriv = fe->frontend_priv;
663 enum fe_status s = FE_NONE;
664 enum dvbfe_algo algo;
665 bool re_tune = false;
666 bool semheld = false;
667
668 dev_dbg(fe->dvb->device, "%s:\n", __func__);
669
670 fepriv->check_wrapped = 0;
671 fepriv->quality = 0;
672 fepriv->delay = 3 * HZ;
673 fepriv->status = 0;
674 fepriv->wakeup = 0;
675 fepriv->reinitialise = 0;
676
677 dvb_frontend_init(fe);
678
679 set_freezable();
680 while (1) {
681 up(&fepriv->sem); /* is locked when we enter the thread... */
682 restart:
683 wait_event_interruptible_timeout(fepriv->wait_queue,
684 dvb_frontend_should_wakeup(fe) ||
685 kthread_should_stop() ||
686 freezing(current),
687 fepriv->delay);
688
689 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
690 /* got signal or quitting */
691 if (!down_interruptible(&fepriv->sem))
692 semheld = true;
693 fe->exit = DVB_FE_NORMAL_EXIT;
694 break;
695 }
696
697 if (try_to_freeze())
698 goto restart;
699
700 if (down_interruptible(&fepriv->sem))
701 break;
702
703 if (fepriv->reinitialise) {
704 dvb_frontend_init(fe);
705 if (fe->ops.set_tone && fepriv->tone != -1)
706 fe->ops.set_tone(fe, fepriv->tone);
707 if (fe->ops.set_voltage && fepriv->voltage != -1)
708 fe->ops.set_voltage(fe, fepriv->voltage);
709 fepriv->reinitialise = 0;
710 }
711
712 /* do an iteration of the tuning loop */
713 if (fe->ops.get_frontend_algo) {
714 algo = fe->ops.get_frontend_algo(fe);
715 switch (algo) {
716 case DVBFE_ALGO_HW:
717 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
718
719 if (fepriv->state & FESTATE_RETUNE) {
720 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
721 re_tune = true;
722 fepriv->state = FESTATE_TUNED;
723 } else {
724 re_tune = false;
725 }
726
727 if (fe->ops.tune)
728 fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
729
730 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
731 dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
732 dvb_frontend_add_event(fe, s);
733 fepriv->status = s;
734 }
735 break;
736 case DVBFE_ALGO_SW:
737 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
738 dvb_frontend_swzigzag(fe);
739 break;
740 case DVBFE_ALGO_CUSTOM:
741 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
742 if (fepriv->state & FESTATE_RETUNE) {
743 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
744 fepriv->state = FESTATE_TUNED;
745 }
746 /* Case where we are going to search for a carrier
747 * User asked us to retune again for some reason, possibly
748 * requesting a search with a new set of parameters
749 */
750 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
751 if (fe->ops.search) {
752 fepriv->algo_status = fe->ops.search(fe);
753 /* We did do a search as was requested, the flags are
754 * now unset as well and has the flags wrt to search.
755 */
756 } else {
757 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
758 }
759 }
760 /* Track the carrier if the search was successful */
761 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
762 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
763 fepriv->delay = HZ / 2;
764 }
765 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
766 fe->ops.read_status(fe, &s);
767 if (s != fepriv->status) {
768 dvb_frontend_add_event(fe, s); /* update event list */
769 fepriv->status = s;
770 if (!(s & FE_HAS_LOCK)) {
771 fepriv->delay = HZ / 10;
772 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
773 } else {
774 fepriv->delay = 60 * HZ;
775 }
776 }
777 break;
778 default:
779 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
780 break;
781 }
782 } else {
783 dvb_frontend_swzigzag(fe);
784 }
785 }
786
787 if (dvb_powerdown_on_sleep) {
788 if (fe->ops.set_voltage)
789 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
790 if (fe->ops.tuner_ops.sleep) {
791 if (fe->ops.i2c_gate_ctrl)
792 fe->ops.i2c_gate_ctrl(fe, 1);
793 fe->ops.tuner_ops.sleep(fe);
794 if (fe->ops.i2c_gate_ctrl)
795 fe->ops.i2c_gate_ctrl(fe, 0);
796 }
797 if (fe->ops.sleep)
798 fe->ops.sleep(fe);
799 }
800
801 fepriv->thread = NULL;
802 if (kthread_should_stop())
803 fe->exit = DVB_FE_DEVICE_REMOVED;
804 else
805 fe->exit = DVB_FE_NO_EXIT;
806 mb();
807
808 if (semheld)
809 up(&fepriv->sem);
810 dvb_frontend_wakeup(fe);
811 return 0;
812 }
813
dvb_frontend_stop(struct dvb_frontend * fe)814 static void dvb_frontend_stop(struct dvb_frontend *fe)
815 {
816 struct dvb_frontend_private *fepriv = fe->frontend_priv;
817
818 dev_dbg(fe->dvb->device, "%s:\n", __func__);
819
820 if (fe->exit != DVB_FE_DEVICE_REMOVED)
821 fe->exit = DVB_FE_NORMAL_EXIT;
822 mb();
823
824 if (!fepriv->thread)
825 return;
826
827 kthread_stop(fepriv->thread);
828
829 sema_init(&fepriv->sem, 1);
830 fepriv->state = FESTATE_IDLE;
831
832 /* paranoia check in case a signal arrived */
833 if (fepriv->thread)
834 dev_warn(fe->dvb->device,
835 "dvb_frontend_stop: warning: thread %p won't exit\n",
836 fepriv->thread);
837 }
838
839 /*
840 * Sleep for the amount of time given by add_usec parameter
841 *
842 * This needs to be as precise as possible, as it affects the detection of
843 * the dish tone command at the satellite subsystem. The precision is improved
844 * by using a scheduled msleep followed by udelay for the remainder.
845 */
dvb_frontend_sleep_until(ktime_t * waketime,u32 add_usec)846 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
847 {
848 s32 delta;
849
850 *waketime = ktime_add_us(*waketime, add_usec);
851 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
852 if (delta > 2500) {
853 msleep((delta - 1500) / 1000);
854 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
855 }
856 if (delta > 0)
857 udelay(delta);
858 }
859 EXPORT_SYMBOL(dvb_frontend_sleep_until);
860
dvb_frontend_start(struct dvb_frontend * fe)861 static int dvb_frontend_start(struct dvb_frontend *fe)
862 {
863 int ret;
864 struct dvb_frontend_private *fepriv = fe->frontend_priv;
865 struct task_struct *fe_thread;
866
867 dev_dbg(fe->dvb->device, "%s:\n", __func__);
868
869 if (fepriv->thread) {
870 if (fe->exit == DVB_FE_NO_EXIT)
871 return 0;
872 else
873 dvb_frontend_stop(fe);
874 }
875
876 if (signal_pending(current))
877 return -EINTR;
878 if (down_interruptible(&fepriv->sem))
879 return -EINTR;
880
881 fepriv->state = FESTATE_IDLE;
882 fe->exit = DVB_FE_NO_EXIT;
883 fepriv->thread = NULL;
884 mb();
885
886 fe_thread = kthread_run(dvb_frontend_thread, fe,
887 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
888 if (IS_ERR(fe_thread)) {
889 ret = PTR_ERR(fe_thread);
890 dev_warn(fe->dvb->device,
891 "dvb_frontend_start: failed to start kthread (%d)\n",
892 ret);
893 up(&fepriv->sem);
894 return ret;
895 }
896 fepriv->thread = fe_thread;
897 return 0;
898 }
899
dvb_frontend_get_frequency_limits(struct dvb_frontend * fe,u32 * freq_min,u32 * freq_max,u32 * tolerance)900 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
901 u32 *freq_min, u32 *freq_max,
902 u32 *tolerance)
903 {
904 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
905 u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
906 u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
907 u32 frontend_min = fe->ops.info.frequency_min_hz;
908 u32 frontend_max = fe->ops.info.frequency_max_hz;
909
910 *freq_min = max(frontend_min, tuner_min);
911
912 if (frontend_max == 0)
913 *freq_max = tuner_max;
914 else if (tuner_max == 0)
915 *freq_max = frontend_max;
916 else
917 *freq_max = min(frontend_max, tuner_max);
918
919 if (*freq_min == 0 || *freq_max == 0)
920 dev_warn(fe->dvb->device,
921 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
922 fe->dvb->num, fe->id);
923
924 dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
925 tuner_min, tuner_max, frontend_min, frontend_max);
926
927 /* If the standard is for satellite, convert frequencies to kHz */
928 switch (c->delivery_system) {
929 case SYS_DSS:
930 case SYS_DVBS:
931 case SYS_DVBS2:
932 case SYS_TURBO:
933 case SYS_ISDBS:
934 *freq_min /= kHz;
935 *freq_max /= kHz;
936 if (tolerance)
937 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
938
939 break;
940 default:
941 if (tolerance)
942 *tolerance = fe->ops.info.frequency_tolerance_hz;
943 break;
944 }
945 }
946
dvb_frontend_get_stepsize(struct dvb_frontend * fe)947 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
948 {
949 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
950 u32 fe_step = fe->ops.info.frequency_stepsize_hz;
951 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
952 u32 step = max(fe_step, tuner_step);
953
954 switch (c->delivery_system) {
955 case SYS_DSS:
956 case SYS_DVBS:
957 case SYS_DVBS2:
958 case SYS_TURBO:
959 case SYS_ISDBS:
960 step /= kHz;
961 break;
962 default:
963 break;
964 }
965
966 return step;
967 }
968
dvb_frontend_check_parameters(struct dvb_frontend * fe)969 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
970 {
971 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
972 u32 freq_min;
973 u32 freq_max;
974
975 /* range check: frequency */
976 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
977 if ((freq_min && c->frequency < freq_min) ||
978 (freq_max && c->frequency > freq_max)) {
979 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
980 fe->dvb->num, fe->id, c->frequency,
981 freq_min, freq_max);
982 return -EINVAL;
983 }
984
985 /* range check: symbol rate */
986 switch (c->delivery_system) {
987 case SYS_DSS:
988 case SYS_DVBS:
989 case SYS_DVBS2:
990 case SYS_TURBO:
991 case SYS_DVBC_ANNEX_A:
992 case SYS_DVBC_ANNEX_C:
993 if ((fe->ops.info.symbol_rate_min &&
994 c->symbol_rate < fe->ops.info.symbol_rate_min) ||
995 (fe->ops.info.symbol_rate_max &&
996 c->symbol_rate > fe->ops.info.symbol_rate_max)) {
997 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
998 fe->dvb->num, fe->id, c->symbol_rate,
999 fe->ops.info.symbol_rate_min,
1000 fe->ops.info.symbol_rate_max);
1001 return -EINVAL;
1002 }
1003 break;
1004 default:
1005 break;
1006 }
1007
1008 return 0;
1009 }
1010
dvb_frontend_clear_cache(struct dvb_frontend * fe)1011 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1012 {
1013 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1014 int i;
1015 u32 delsys;
1016
1017 delsys = c->delivery_system;
1018 memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1019 c->delivery_system = delsys;
1020
1021 dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1022 __func__, c->delivery_system);
1023
1024 c->transmission_mode = TRANSMISSION_MODE_AUTO;
1025 c->bandwidth_hz = 0; /* AUTO */
1026 c->guard_interval = GUARD_INTERVAL_AUTO;
1027 c->hierarchy = HIERARCHY_AUTO;
1028 c->symbol_rate = 0;
1029 c->code_rate_HP = FEC_AUTO;
1030 c->code_rate_LP = FEC_AUTO;
1031 c->fec_inner = FEC_AUTO;
1032 c->rolloff = ROLLOFF_AUTO;
1033 c->voltage = SEC_VOLTAGE_OFF;
1034 c->sectone = SEC_TONE_OFF;
1035 c->pilot = PILOT_AUTO;
1036
1037 c->isdbt_partial_reception = 0;
1038 c->isdbt_sb_mode = 0;
1039 c->isdbt_sb_subchannel = 0;
1040 c->isdbt_sb_segment_idx = 0;
1041 c->isdbt_sb_segment_count = 0;
1042 c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */
1043 for (i = 0; i < 3; i++) {
1044 c->layer[i].fec = FEC_AUTO;
1045 c->layer[i].modulation = QAM_AUTO;
1046 c->layer[i].interleaving = 0;
1047 c->layer[i].segment_count = 0;
1048 }
1049
1050 c->stream_id = NO_STREAM_ID_FILTER;
1051 c->scrambling_sequence_index = 0;/* default sequence */
1052
1053 switch (c->delivery_system) {
1054 case SYS_DSS:
1055 c->modulation = QPSK;
1056 c->rolloff = ROLLOFF_20;
1057 break;
1058 case SYS_DVBS:
1059 case SYS_DVBS2:
1060 case SYS_TURBO:
1061 c->modulation = QPSK; /* implied for DVB-S in legacy API */
1062 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1063 break;
1064 case SYS_ATSC:
1065 c->modulation = VSB_8;
1066 break;
1067 case SYS_ISDBS:
1068 c->symbol_rate = 28860000;
1069 c->rolloff = ROLLOFF_35;
1070 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1071 break;
1072 default:
1073 c->modulation = QAM_AUTO;
1074 break;
1075 }
1076
1077 c->lna = LNA_AUTO;
1078
1079 return 0;
1080 }
1081
1082 #define _DTV_CMD(n) \
1083 [n] = #n
1084
1085 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1086 _DTV_CMD(DTV_TUNE),
1087 _DTV_CMD(DTV_CLEAR),
1088
1089 /* Set */
1090 _DTV_CMD(DTV_FREQUENCY),
1091 _DTV_CMD(DTV_BANDWIDTH_HZ),
1092 _DTV_CMD(DTV_MODULATION),
1093 _DTV_CMD(DTV_INVERSION),
1094 _DTV_CMD(DTV_DISEQC_MASTER),
1095 _DTV_CMD(DTV_SYMBOL_RATE),
1096 _DTV_CMD(DTV_INNER_FEC),
1097 _DTV_CMD(DTV_VOLTAGE),
1098 _DTV_CMD(DTV_TONE),
1099 _DTV_CMD(DTV_PILOT),
1100 _DTV_CMD(DTV_ROLLOFF),
1101 _DTV_CMD(DTV_DELIVERY_SYSTEM),
1102 _DTV_CMD(DTV_HIERARCHY),
1103 _DTV_CMD(DTV_CODE_RATE_HP),
1104 _DTV_CMD(DTV_CODE_RATE_LP),
1105 _DTV_CMD(DTV_GUARD_INTERVAL),
1106 _DTV_CMD(DTV_TRANSMISSION_MODE),
1107 _DTV_CMD(DTV_INTERLEAVING),
1108
1109 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1110 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1111 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1112 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1113 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1114 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1115 _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1116 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1117 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1118 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1119 _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1120 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1121 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1122 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1123 _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1124 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1125 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1126 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1127
1128 _DTV_CMD(DTV_STREAM_ID),
1129 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1130 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1131 _DTV_CMD(DTV_LNA),
1132
1133 /* Get */
1134 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1135 _DTV_CMD(DTV_API_VERSION),
1136
1137 _DTV_CMD(DTV_ENUM_DELSYS),
1138
1139 _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1140 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1141
1142 _DTV_CMD(DTV_ATSCMH_FIC_VER),
1143 _DTV_CMD(DTV_ATSCMH_NOG),
1144 _DTV_CMD(DTV_ATSCMH_TNOG),
1145 _DTV_CMD(DTV_ATSCMH_SGN),
1146 _DTV_CMD(DTV_ATSCMH_PRC),
1147 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1148 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1149 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1150 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1151 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1152 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1153 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1154 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1155
1156 /* Statistics API */
1157 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1158 _DTV_CMD(DTV_STAT_CNR),
1159 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1160 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1161 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1162 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1163 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1164 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1165 };
1166
dtv_cmd_name(u32 cmd)1167 static char *dtv_cmd_name(u32 cmd)
1168 {
1169 cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1170 return dtv_cmds[cmd];
1171 }
1172
1173 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1174 * drivers can use a single set_frontend tuning function, regardless of whether
1175 * it's being used for the legacy or new API, reducing code and complexity.
1176 */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1177 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1178 struct dtv_frontend_properties *c,
1179 const struct dvb_frontend_parameters *p)
1180 {
1181 c->frequency = p->frequency;
1182 c->inversion = p->inversion;
1183
1184 switch (dvbv3_type(c->delivery_system)) {
1185 case DVBV3_QPSK:
1186 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1187 c->symbol_rate = p->u.qpsk.symbol_rate;
1188 c->fec_inner = p->u.qpsk.fec_inner;
1189 break;
1190 case DVBV3_QAM:
1191 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1192 c->symbol_rate = p->u.qam.symbol_rate;
1193 c->fec_inner = p->u.qam.fec_inner;
1194 c->modulation = p->u.qam.modulation;
1195 break;
1196 case DVBV3_OFDM:
1197 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1198
1199 switch (p->u.ofdm.bandwidth) {
1200 case BANDWIDTH_10_MHZ:
1201 c->bandwidth_hz = 10000000;
1202 break;
1203 case BANDWIDTH_8_MHZ:
1204 c->bandwidth_hz = 8000000;
1205 break;
1206 case BANDWIDTH_7_MHZ:
1207 c->bandwidth_hz = 7000000;
1208 break;
1209 case BANDWIDTH_6_MHZ:
1210 c->bandwidth_hz = 6000000;
1211 break;
1212 case BANDWIDTH_5_MHZ:
1213 c->bandwidth_hz = 5000000;
1214 break;
1215 case BANDWIDTH_1_712_MHZ:
1216 c->bandwidth_hz = 1712000;
1217 break;
1218 case BANDWIDTH_AUTO:
1219 c->bandwidth_hz = 0;
1220 }
1221
1222 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1223 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1224 c->modulation = p->u.ofdm.constellation;
1225 c->transmission_mode = p->u.ofdm.transmission_mode;
1226 c->guard_interval = p->u.ofdm.guard_interval;
1227 c->hierarchy = p->u.ofdm.hierarchy_information;
1228 break;
1229 case DVBV3_ATSC:
1230 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1231 c->modulation = p->u.vsb.modulation;
1232 if (c->delivery_system == SYS_ATSCMH)
1233 break;
1234 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1235 c->delivery_system = SYS_ATSC;
1236 else
1237 c->delivery_system = SYS_DVBC_ANNEX_B;
1238 break;
1239 case DVBV3_UNKNOWN:
1240 dev_err(fe->dvb->device,
1241 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1242 __func__, c->delivery_system);
1243 return -EINVAL;
1244 }
1245
1246 return 0;
1247 }
1248
1249 /* Ensure the cached values are set correctly in the frontend
1250 * legacy tuning structures, for the advanced tuning API.
1251 */
1252 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1253 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1254 const struct dtv_frontend_properties *c,
1255 struct dvb_frontend_parameters *p)
1256 {
1257 p->frequency = c->frequency;
1258 p->inversion = c->inversion;
1259
1260 switch (dvbv3_type(c->delivery_system)) {
1261 case DVBV3_UNKNOWN:
1262 dev_err(fe->dvb->device,
1263 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1264 __func__, c->delivery_system);
1265 return -EINVAL;
1266 case DVBV3_QPSK:
1267 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1268 p->u.qpsk.symbol_rate = c->symbol_rate;
1269 p->u.qpsk.fec_inner = c->fec_inner;
1270 break;
1271 case DVBV3_QAM:
1272 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1273 p->u.qam.symbol_rate = c->symbol_rate;
1274 p->u.qam.fec_inner = c->fec_inner;
1275 p->u.qam.modulation = c->modulation;
1276 break;
1277 case DVBV3_OFDM:
1278 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1279 switch (c->bandwidth_hz) {
1280 case 10000000:
1281 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1282 break;
1283 case 8000000:
1284 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1285 break;
1286 case 7000000:
1287 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1288 break;
1289 case 6000000:
1290 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1291 break;
1292 case 5000000:
1293 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1294 break;
1295 case 1712000:
1296 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1297 break;
1298 case 0:
1299 default:
1300 p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1301 }
1302 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1303 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1304 p->u.ofdm.constellation = c->modulation;
1305 p->u.ofdm.transmission_mode = c->transmission_mode;
1306 p->u.ofdm.guard_interval = c->guard_interval;
1307 p->u.ofdm.hierarchy_information = c->hierarchy;
1308 break;
1309 case DVBV3_ATSC:
1310 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1311 p->u.vsb.modulation = c->modulation;
1312 break;
1313 }
1314 return 0;
1315 }
1316
1317 /**
1318 * dtv_get_frontend - calls a callback for retrieving DTV parameters
1319 * @fe: struct dvb_frontend pointer
1320 * @c: struct dtv_frontend_properties pointer (DVBv5 cache)
1321 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1322 *
1323 * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1324 * If c is not null, it will update the DVBv5 cache struct pointed by it.
1325 * If p_out is not null, it will update the DVBv3 params pointed by it.
1326 */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1327 static int dtv_get_frontend(struct dvb_frontend *fe,
1328 struct dtv_frontend_properties *c,
1329 struct dvb_frontend_parameters *p_out)
1330 {
1331 int r;
1332
1333 if (fe->ops.get_frontend) {
1334 r = fe->ops.get_frontend(fe, c);
1335 if (unlikely(r < 0))
1336 return r;
1337 if (p_out)
1338 dtv_property_legacy_params_sync(fe, c, p_out);
1339 return 0;
1340 }
1341
1342 /* As everything is in cache, get_frontend fops are always supported */
1343 return 0;
1344 }
1345
1346 static int dvb_frontend_handle_ioctl(struct file *file,
1347 unsigned int cmd, void *parg);
1348
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1349 static int dtv_property_process_get(struct dvb_frontend *fe,
1350 const struct dtv_frontend_properties *c,
1351 struct dtv_property *tvp,
1352 struct file *file)
1353 {
1354 int ncaps;
1355 unsigned int len = 1;
1356
1357 switch (tvp->cmd) {
1358 case DTV_ENUM_DELSYS:
1359 ncaps = 0;
1360 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1361 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1362 ncaps++;
1363 }
1364 tvp->u.buffer.len = ncaps;
1365 len = ncaps;
1366 break;
1367 case DTV_FREQUENCY:
1368 tvp->u.data = c->frequency;
1369 break;
1370 case DTV_MODULATION:
1371 tvp->u.data = c->modulation;
1372 break;
1373 case DTV_BANDWIDTH_HZ:
1374 tvp->u.data = c->bandwidth_hz;
1375 break;
1376 case DTV_INVERSION:
1377 tvp->u.data = c->inversion;
1378 break;
1379 case DTV_SYMBOL_RATE:
1380 tvp->u.data = c->symbol_rate;
1381 break;
1382 case DTV_INNER_FEC:
1383 tvp->u.data = c->fec_inner;
1384 break;
1385 case DTV_PILOT:
1386 tvp->u.data = c->pilot;
1387 break;
1388 case DTV_ROLLOFF:
1389 tvp->u.data = c->rolloff;
1390 break;
1391 case DTV_DELIVERY_SYSTEM:
1392 tvp->u.data = c->delivery_system;
1393 break;
1394 case DTV_VOLTAGE:
1395 tvp->u.data = c->voltage;
1396 break;
1397 case DTV_TONE:
1398 tvp->u.data = c->sectone;
1399 break;
1400 case DTV_API_VERSION:
1401 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1402 break;
1403 case DTV_CODE_RATE_HP:
1404 tvp->u.data = c->code_rate_HP;
1405 break;
1406 case DTV_CODE_RATE_LP:
1407 tvp->u.data = c->code_rate_LP;
1408 break;
1409 case DTV_GUARD_INTERVAL:
1410 tvp->u.data = c->guard_interval;
1411 break;
1412 case DTV_TRANSMISSION_MODE:
1413 tvp->u.data = c->transmission_mode;
1414 break;
1415 case DTV_HIERARCHY:
1416 tvp->u.data = c->hierarchy;
1417 break;
1418 case DTV_INTERLEAVING:
1419 tvp->u.data = c->interleaving;
1420 break;
1421
1422 /* ISDB-T Support here */
1423 case DTV_ISDBT_PARTIAL_RECEPTION:
1424 tvp->u.data = c->isdbt_partial_reception;
1425 break;
1426 case DTV_ISDBT_SOUND_BROADCASTING:
1427 tvp->u.data = c->isdbt_sb_mode;
1428 break;
1429 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1430 tvp->u.data = c->isdbt_sb_subchannel;
1431 break;
1432 case DTV_ISDBT_SB_SEGMENT_IDX:
1433 tvp->u.data = c->isdbt_sb_segment_idx;
1434 break;
1435 case DTV_ISDBT_SB_SEGMENT_COUNT:
1436 tvp->u.data = c->isdbt_sb_segment_count;
1437 break;
1438 case DTV_ISDBT_LAYER_ENABLED:
1439 tvp->u.data = c->isdbt_layer_enabled;
1440 break;
1441 case DTV_ISDBT_LAYERA_FEC:
1442 tvp->u.data = c->layer[0].fec;
1443 break;
1444 case DTV_ISDBT_LAYERA_MODULATION:
1445 tvp->u.data = c->layer[0].modulation;
1446 break;
1447 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1448 tvp->u.data = c->layer[0].segment_count;
1449 break;
1450 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1451 tvp->u.data = c->layer[0].interleaving;
1452 break;
1453 case DTV_ISDBT_LAYERB_FEC:
1454 tvp->u.data = c->layer[1].fec;
1455 break;
1456 case DTV_ISDBT_LAYERB_MODULATION:
1457 tvp->u.data = c->layer[1].modulation;
1458 break;
1459 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1460 tvp->u.data = c->layer[1].segment_count;
1461 break;
1462 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1463 tvp->u.data = c->layer[1].interleaving;
1464 break;
1465 case DTV_ISDBT_LAYERC_FEC:
1466 tvp->u.data = c->layer[2].fec;
1467 break;
1468 case DTV_ISDBT_LAYERC_MODULATION:
1469 tvp->u.data = c->layer[2].modulation;
1470 break;
1471 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1472 tvp->u.data = c->layer[2].segment_count;
1473 break;
1474 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1475 tvp->u.data = c->layer[2].interleaving;
1476 break;
1477
1478 /* Multistream support */
1479 case DTV_STREAM_ID:
1480 case DTV_DVBT2_PLP_ID_LEGACY:
1481 tvp->u.data = c->stream_id;
1482 break;
1483
1484 /* Physical layer scrambling support */
1485 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1486 tvp->u.data = c->scrambling_sequence_index;
1487 break;
1488
1489 /* ATSC-MH */
1490 case DTV_ATSCMH_FIC_VER:
1491 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1492 break;
1493 case DTV_ATSCMH_PARADE_ID:
1494 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1495 break;
1496 case DTV_ATSCMH_NOG:
1497 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1498 break;
1499 case DTV_ATSCMH_TNOG:
1500 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1501 break;
1502 case DTV_ATSCMH_SGN:
1503 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1504 break;
1505 case DTV_ATSCMH_PRC:
1506 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1507 break;
1508 case DTV_ATSCMH_RS_FRAME_MODE:
1509 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1510 break;
1511 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1512 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1513 break;
1514 case DTV_ATSCMH_RS_CODE_MODE_PRI:
1515 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1516 break;
1517 case DTV_ATSCMH_RS_CODE_MODE_SEC:
1518 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1519 break;
1520 case DTV_ATSCMH_SCCC_BLOCK_MODE:
1521 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1522 break;
1523 case DTV_ATSCMH_SCCC_CODE_MODE_A:
1524 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1525 break;
1526 case DTV_ATSCMH_SCCC_CODE_MODE_B:
1527 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1528 break;
1529 case DTV_ATSCMH_SCCC_CODE_MODE_C:
1530 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1531 break;
1532 case DTV_ATSCMH_SCCC_CODE_MODE_D:
1533 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1534 break;
1535
1536 case DTV_LNA:
1537 tvp->u.data = c->lna;
1538 break;
1539
1540 /* Fill quality measures */
1541 case DTV_STAT_SIGNAL_STRENGTH:
1542 tvp->u.st = c->strength;
1543 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1544 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1545 len = tvp->u.buffer.len;
1546 break;
1547 case DTV_STAT_CNR:
1548 tvp->u.st = c->cnr;
1549 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1550 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1551 len = tvp->u.buffer.len;
1552 break;
1553 case DTV_STAT_PRE_ERROR_BIT_COUNT:
1554 tvp->u.st = c->pre_bit_error;
1555 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1556 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1557 len = tvp->u.buffer.len;
1558 break;
1559 case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1560 tvp->u.st = c->pre_bit_count;
1561 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1562 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1563 len = tvp->u.buffer.len;
1564 break;
1565 case DTV_STAT_POST_ERROR_BIT_COUNT:
1566 tvp->u.st = c->post_bit_error;
1567 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1568 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1569 len = tvp->u.buffer.len;
1570 break;
1571 case DTV_STAT_POST_TOTAL_BIT_COUNT:
1572 tvp->u.st = c->post_bit_count;
1573 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1574 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1575 len = tvp->u.buffer.len;
1576 break;
1577 case DTV_STAT_ERROR_BLOCK_COUNT:
1578 tvp->u.st = c->block_error;
1579 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1580 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1581 len = tvp->u.buffer.len;
1582 break;
1583 case DTV_STAT_TOTAL_BLOCK_COUNT:
1584 tvp->u.st = c->block_count;
1585 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1586 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1587 len = tvp->u.buffer.len;
1588 break;
1589 default:
1590 dev_dbg(fe->dvb->device,
1591 "%s: FE property %d doesn't exist\n",
1592 __func__, tvp->cmd);
1593 return -EINVAL;
1594 }
1595
1596 if (len < 1)
1597 len = 1;
1598
1599 dev_dbg(fe->dvb->device,
1600 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1601 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1602 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1603
1604 return 0;
1605 }
1606
1607 static int dtv_set_frontend(struct dvb_frontend *fe);
1608
is_dvbv3_delsys(u32 delsys)1609 static bool is_dvbv3_delsys(u32 delsys)
1610 {
1611 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1612 (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1613 }
1614
1615 /**
1616 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1617 * @fe: struct frontend;
1618 * @delsys: DVBv5 type that will be used for emulation
1619 *
1620 * Provides emulation for delivery systems that are compatible with the old
1621 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1622 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1623 * parameters are compatible with DVB-S spec.
1624 */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1625 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1626 {
1627 int i;
1628 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1629
1630 c->delivery_system = delsys;
1631
1632 /*
1633 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1634 */
1635 if (c->delivery_system == SYS_ISDBT) {
1636 dev_dbg(fe->dvb->device,
1637 "%s: Using defaults for SYS_ISDBT\n",
1638 __func__);
1639
1640 if (!c->bandwidth_hz)
1641 c->bandwidth_hz = 6000000;
1642
1643 c->isdbt_partial_reception = 0;
1644 c->isdbt_sb_mode = 0;
1645 c->isdbt_sb_subchannel = 0;
1646 c->isdbt_sb_segment_idx = 0;
1647 c->isdbt_sb_segment_count = 0;
1648 c->isdbt_layer_enabled = 7;
1649 for (i = 0; i < 3; i++) {
1650 c->layer[i].fec = FEC_AUTO;
1651 c->layer[i].modulation = QAM_AUTO;
1652 c->layer[i].interleaving = 0;
1653 c->layer[i].segment_count = 0;
1654 }
1655 }
1656 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1657 __func__, c->delivery_system);
1658
1659 return 0;
1660 }
1661
1662 /**
1663 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1664 * @fe: frontend struct
1665 * @desired_system: delivery system requested by the user
1666 *
1667 * A DVBv5 call know what's the desired system it wants. So, set it.
1668 *
1669 * There are, however, a few known issues with early DVBv5 applications that
1670 * are also handled by this logic:
1671 *
1672 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1673 * This is an API violation, but, as we don't want to break userspace,
1674 * convert it to the first supported delivery system.
1675 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1676 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1677 * ISDB-T provided backward compat with DVB-T.
1678 */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1679 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1680 u32 desired_system)
1681 {
1682 int ncaps;
1683 u32 delsys = SYS_UNDEFINED;
1684 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1685 enum dvbv3_emulation_type type;
1686
1687 /*
1688 * It was reported that some old DVBv5 applications were
1689 * filling delivery_system with SYS_UNDEFINED. If this happens,
1690 * assume that the application wants to use the first supported
1691 * delivery system.
1692 */
1693 if (desired_system == SYS_UNDEFINED)
1694 desired_system = fe->ops.delsys[0];
1695
1696 /*
1697 * This is a DVBv5 call. So, it likely knows the supported
1698 * delivery systems. So, check if the desired delivery system is
1699 * supported
1700 */
1701 ncaps = 0;
1702 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703 if (fe->ops.delsys[ncaps] == desired_system) {
1704 c->delivery_system = desired_system;
1705 dev_dbg(fe->dvb->device,
1706 "%s: Changing delivery system to %d\n",
1707 __func__, desired_system);
1708 return 0;
1709 }
1710 ncaps++;
1711 }
1712
1713 /*
1714 * The requested delivery system isn't supported. Maybe userspace
1715 * is requesting a DVBv3 compatible delivery system.
1716 *
1717 * The emulation only works if the desired system is one of the
1718 * delivery systems supported by DVBv3 API
1719 */
1720 if (!is_dvbv3_delsys(desired_system)) {
1721 dev_dbg(fe->dvb->device,
1722 "%s: Delivery system %d not supported.\n",
1723 __func__, desired_system);
1724 return -EINVAL;
1725 }
1726
1727 type = dvbv3_type(desired_system);
1728
1729 /*
1730 * Get the last non-DVBv3 delivery system that has the same type
1731 * of the desired system
1732 */
1733 ncaps = 0;
1734 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1735 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1736 delsys = fe->ops.delsys[ncaps];
1737 ncaps++;
1738 }
1739
1740 /* There's nothing compatible with the desired delivery system */
1741 if (delsys == SYS_UNDEFINED) {
1742 dev_dbg(fe->dvb->device,
1743 "%s: Delivery system %d not supported on emulation mode.\n",
1744 __func__, desired_system);
1745 return -EINVAL;
1746 }
1747
1748 dev_dbg(fe->dvb->device,
1749 "%s: Using delivery system %d emulated as if it were %d\n",
1750 __func__, delsys, desired_system);
1751
1752 return emulate_delivery_system(fe, desired_system);
1753 }
1754
1755 /**
1756 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1757 * @fe: frontend struct
1758 *
1759 * A DVBv3 call doesn't know what's the desired system it wants. It also
1760 * doesn't allow to switch between different types. Due to that, userspace
1761 * should use DVBv5 instead.
1762 * However, in order to avoid breaking userspace API, limited backward
1763 * compatibility support is provided.
1764 *
1765 * There are some delivery systems that are incompatible with DVBv3 calls.
1766 *
1767 * This routine should work fine for frontends that support just one delivery
1768 * system.
1769 *
1770 * For frontends that support multiple frontends:
1771 * 1) It defaults to use the first supported delivery system. There's an
1772 * userspace application that allows changing it at runtime;
1773 *
1774 * 2) If the current delivery system is not compatible with DVBv3, it gets
1775 * the first one that it is compatible.
1776 *
1777 * NOTE: in order for this to work with applications like Kaffeine that
1778 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1779 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1780 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1781 * to DVB-S.
1782 */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1783 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1784 {
1785 int ncaps;
1786 u32 delsys = SYS_UNDEFINED;
1787 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1788
1789 /* If not set yet, defaults to the first supported delivery system */
1790 if (c->delivery_system == SYS_UNDEFINED)
1791 c->delivery_system = fe->ops.delsys[0];
1792
1793 /*
1794 * Trivial case: just use the current one, if it already a DVBv3
1795 * delivery system
1796 */
1797 if (is_dvbv3_delsys(c->delivery_system)) {
1798 dev_dbg(fe->dvb->device,
1799 "%s: Using delivery system to %d\n",
1800 __func__, c->delivery_system);
1801 return 0;
1802 }
1803
1804 /*
1805 * Seek for the first delivery system that it is compatible with a
1806 * DVBv3 standard
1807 */
1808 ncaps = 0;
1809 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1810 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1811 delsys = fe->ops.delsys[ncaps];
1812 break;
1813 }
1814 ncaps++;
1815 }
1816 if (delsys == SYS_UNDEFINED) {
1817 dev_dbg(fe->dvb->device,
1818 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1819 __func__);
1820 return -EINVAL;
1821 }
1822 return emulate_delivery_system(fe, delsys);
1823 }
1824
prepare_tuning_algo_parameters(struct dvb_frontend * fe)1825 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1826 {
1827 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1828 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1829 struct dvb_frontend_tune_settings fetunesettings = { 0 };
1830
1831 /* get frontend-specific tuning settings */
1832 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1833 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1834 fepriv->max_drift = fetunesettings.max_drift;
1835 fepriv->step_size = fetunesettings.step_size;
1836 } else {
1837 /* default values */
1838 switch (c->delivery_system) {
1839 case SYS_DSS:
1840 case SYS_DVBS:
1841 case SYS_DVBS2:
1842 case SYS_ISDBS:
1843 case SYS_TURBO:
1844 case SYS_DVBC_ANNEX_A:
1845 case SYS_DVBC_ANNEX_C:
1846 fepriv->min_delay = HZ / 20;
1847 fepriv->step_size = c->symbol_rate / 16000;
1848 fepriv->max_drift = c->symbol_rate / 2000;
1849 break;
1850 case SYS_DVBT:
1851 case SYS_DVBT2:
1852 case SYS_ISDBT:
1853 case SYS_DTMB:
1854 fepriv->min_delay = HZ / 20;
1855 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1856 fepriv->max_drift = fepriv->step_size + 1;
1857 break;
1858 default:
1859 /*
1860 * FIXME: This sounds wrong! if freqency_stepsize is
1861 * defined by the frontend, why not use it???
1862 */
1863 fepriv->min_delay = HZ / 20;
1864 fepriv->step_size = 0; /* no zigzag */
1865 fepriv->max_drift = 0;
1866 break;
1867 }
1868 }
1869 if (dvb_override_tune_delay > 0)
1870 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1871 }
1872
1873 /**
1874 * dtv_property_process_set - Sets a single DTV property
1875 * @fe: Pointer to &struct dvb_frontend
1876 * @file: Pointer to &struct file
1877 * @cmd: Digital TV command
1878 * @data: An unsigned 32-bits number
1879 *
1880 * This routine assigns the property
1881 * value to the corresponding member of
1882 * &struct dtv_frontend_properties
1883 *
1884 * Returns:
1885 * Zero on success, negative errno on failure.
1886 */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1887 static int dtv_property_process_set(struct dvb_frontend *fe,
1888 struct file *file,
1889 u32 cmd, u32 data)
1890 {
1891 int r = 0;
1892 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1893
1894 /** Dump DTV command name and value*/
1895 if (!cmd || cmd > DTV_MAX_COMMAND)
1896 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1897 __func__, cmd);
1898 else
1899 dev_dbg(fe->dvb->device,
1900 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1901 __func__, cmd, dtv_cmd_name(cmd), data);
1902 switch (cmd) {
1903 case DTV_CLEAR:
1904 /*
1905 * Reset a cache of data specific to the frontend here. This does
1906 * not effect hardware.
1907 */
1908 dvb_frontend_clear_cache(fe);
1909 break;
1910 case DTV_TUNE:
1911 /*
1912 * Use the cached Digital TV properties to tune the
1913 * frontend
1914 */
1915 dev_dbg(fe->dvb->device,
1916 "%s: Setting the frontend from property cache\n",
1917 __func__);
1918
1919 r = dtv_set_frontend(fe);
1920 break;
1921 case DTV_FREQUENCY:
1922 c->frequency = data;
1923 break;
1924 case DTV_MODULATION:
1925 c->modulation = data;
1926 break;
1927 case DTV_BANDWIDTH_HZ:
1928 c->bandwidth_hz = data;
1929 break;
1930 case DTV_INVERSION:
1931 c->inversion = data;
1932 break;
1933 case DTV_SYMBOL_RATE:
1934 c->symbol_rate = data;
1935 break;
1936 case DTV_INNER_FEC:
1937 c->fec_inner = data;
1938 break;
1939 case DTV_PILOT:
1940 c->pilot = data;
1941 break;
1942 case DTV_ROLLOFF:
1943 c->rolloff = data;
1944 break;
1945 case DTV_DELIVERY_SYSTEM:
1946 r = dvbv5_set_delivery_system(fe, data);
1947 break;
1948 case DTV_VOLTAGE:
1949 c->voltage = data;
1950 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1951 (void *)c->voltage);
1952 break;
1953 case DTV_TONE:
1954 c->sectone = data;
1955 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1956 (void *)c->sectone);
1957 break;
1958 case DTV_CODE_RATE_HP:
1959 c->code_rate_HP = data;
1960 break;
1961 case DTV_CODE_RATE_LP:
1962 c->code_rate_LP = data;
1963 break;
1964 case DTV_GUARD_INTERVAL:
1965 c->guard_interval = data;
1966 break;
1967 case DTV_TRANSMISSION_MODE:
1968 c->transmission_mode = data;
1969 break;
1970 case DTV_HIERARCHY:
1971 c->hierarchy = data;
1972 break;
1973 case DTV_INTERLEAVING:
1974 c->interleaving = data;
1975 break;
1976
1977 /* ISDB-T Support here */
1978 case DTV_ISDBT_PARTIAL_RECEPTION:
1979 c->isdbt_partial_reception = data;
1980 break;
1981 case DTV_ISDBT_SOUND_BROADCASTING:
1982 c->isdbt_sb_mode = data;
1983 break;
1984 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1985 c->isdbt_sb_subchannel = data;
1986 break;
1987 case DTV_ISDBT_SB_SEGMENT_IDX:
1988 c->isdbt_sb_segment_idx = data;
1989 break;
1990 case DTV_ISDBT_SB_SEGMENT_COUNT:
1991 c->isdbt_sb_segment_count = data;
1992 break;
1993 case DTV_ISDBT_LAYER_ENABLED:
1994 c->isdbt_layer_enabled = data;
1995 break;
1996 case DTV_ISDBT_LAYERA_FEC:
1997 c->layer[0].fec = data;
1998 break;
1999 case DTV_ISDBT_LAYERA_MODULATION:
2000 c->layer[0].modulation = data;
2001 break;
2002 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
2003 c->layer[0].segment_count = data;
2004 break;
2005 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
2006 c->layer[0].interleaving = data;
2007 break;
2008 case DTV_ISDBT_LAYERB_FEC:
2009 c->layer[1].fec = data;
2010 break;
2011 case DTV_ISDBT_LAYERB_MODULATION:
2012 c->layer[1].modulation = data;
2013 break;
2014 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2015 c->layer[1].segment_count = data;
2016 break;
2017 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2018 c->layer[1].interleaving = data;
2019 break;
2020 case DTV_ISDBT_LAYERC_FEC:
2021 c->layer[2].fec = data;
2022 break;
2023 case DTV_ISDBT_LAYERC_MODULATION:
2024 c->layer[2].modulation = data;
2025 break;
2026 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2027 c->layer[2].segment_count = data;
2028 break;
2029 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2030 c->layer[2].interleaving = data;
2031 break;
2032
2033 /* Multistream support */
2034 case DTV_STREAM_ID:
2035 case DTV_DVBT2_PLP_ID_LEGACY:
2036 c->stream_id = data;
2037 break;
2038
2039 /* Physical layer scrambling support */
2040 case DTV_SCRAMBLING_SEQUENCE_INDEX:
2041 c->scrambling_sequence_index = data;
2042 break;
2043
2044 /* ATSC-MH */
2045 case DTV_ATSCMH_PARADE_ID:
2046 fe->dtv_property_cache.atscmh_parade_id = data;
2047 break;
2048 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2049 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2050 break;
2051
2052 case DTV_LNA:
2053 c->lna = data;
2054 if (fe->ops.set_lna)
2055 r = fe->ops.set_lna(fe);
2056 if (r < 0)
2057 c->lna = LNA_AUTO;
2058 break;
2059
2060 default:
2061 return -EINVAL;
2062 }
2063
2064 return r;
2065 }
2066
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)2067 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2068 void *parg)
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 err;
2074
2075 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2076 if (down_interruptible(&fepriv->sem))
2077 return -ERESTARTSYS;
2078
2079 if (fe->exit != DVB_FE_NO_EXIT) {
2080 up(&fepriv->sem);
2081 return -ENODEV;
2082 }
2083
2084 /*
2085 * If the frontend is opened in read-only mode, only the ioctls
2086 * that don't interfere with the tune logic should be accepted.
2087 * That allows an external application to monitor the DVB QoS and
2088 * statistics parameters.
2089 *
2090 * That matches all _IOR() ioctls, except for two special cases:
2091 * - FE_GET_EVENT is part of the tuning logic on a DVB application;
2092 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2093 * setup
2094 * So, those two ioctls should also return -EPERM, as otherwise
2095 * reading from them would interfere with a DVB tune application
2096 */
2097 if ((file->f_flags & O_ACCMODE) == O_RDONLY
2098 && (_IOC_DIR(cmd) != _IOC_READ
2099 || cmd == FE_GET_EVENT
2100 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2101 up(&fepriv->sem);
2102 return -EPERM;
2103 }
2104
2105 err = dvb_frontend_handle_ioctl(file, cmd, parg);
2106
2107 up(&fepriv->sem);
2108 return err;
2109 }
2110
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2111 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2112 unsigned long arg)
2113 {
2114 struct dvb_device *dvbdev = file->private_data;
2115
2116 if (!dvbdev)
2117 return -ENODEV;
2118
2119 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2120 }
2121
2122 #ifdef CONFIG_COMPAT
2123 struct compat_dtv_property {
2124 __u32 cmd;
2125 __u32 reserved[3];
2126 union {
2127 __u32 data;
2128 struct dtv_fe_stats st;
2129 struct {
2130 __u8 data[32];
2131 __u32 len;
2132 __u32 reserved1[3];
2133 compat_uptr_t reserved2;
2134 } buffer;
2135 } u;
2136 int result;
2137 } __attribute__ ((packed));
2138
2139 struct compat_dtv_properties {
2140 __u32 num;
2141 compat_uptr_t props;
2142 };
2143
2144 #define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
2145 #define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
2146
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2147 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2148 unsigned long arg)
2149 {
2150 struct dvb_device *dvbdev = file->private_data;
2151 struct dvb_frontend *fe = dvbdev->priv;
2152 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2153 int i, err = 0;
2154
2155 if (cmd == COMPAT_FE_SET_PROPERTY) {
2156 struct compat_dtv_properties prop, *tvps = NULL;
2157 struct compat_dtv_property *tvp = NULL;
2158
2159 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2160 return -EFAULT;
2161
2162 tvps = ∝
2163
2164 /*
2165 * Put an arbitrary limit on the number of messages that can
2166 * be sent at once
2167 */
2168 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2169 return -EINVAL;
2170
2171 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2172 if (IS_ERR(tvp))
2173 return PTR_ERR(tvp);
2174
2175 for (i = 0; i < tvps->num; i++) {
2176 err = dtv_property_process_set(fe, file,
2177 (tvp + i)->cmd,
2178 (tvp + i)->u.data);
2179 if (err < 0) {
2180 kfree(tvp);
2181 return err;
2182 }
2183 }
2184 kfree(tvp);
2185 } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2186 struct compat_dtv_properties prop, *tvps = NULL;
2187 struct compat_dtv_property *tvp = NULL;
2188 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2189
2190 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2191 return -EFAULT;
2192
2193 tvps = ∝
2194
2195 /*
2196 * Put an arbitrary limit on the number of messages that can
2197 * be sent at once
2198 */
2199 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2200 return -EINVAL;
2201
2202 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2203 if (IS_ERR(tvp))
2204 return PTR_ERR(tvp);
2205
2206 /*
2207 * Let's use our own copy of property cache, in order to
2208 * avoid mangling with DTV zigzag logic, as drivers might
2209 * return crap, if they don't check if the data is available
2210 * before updating the properties cache.
2211 */
2212 if (fepriv->state != FESTATE_IDLE) {
2213 err = dtv_get_frontend(fe, &getp, NULL);
2214 if (err < 0) {
2215 kfree(tvp);
2216 return err;
2217 }
2218 }
2219 for (i = 0; i < tvps->num; i++) {
2220 err = dtv_property_process_get(
2221 fe, &getp, (struct dtv_property *)(tvp + i), file);
2222 if (err < 0) {
2223 kfree(tvp);
2224 return err;
2225 }
2226 }
2227
2228 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2229 tvps->num * sizeof(struct compat_dtv_property))) {
2230 kfree(tvp);
2231 return -EFAULT;
2232 }
2233 kfree(tvp);
2234 }
2235
2236 return err;
2237 }
2238
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2239 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2240 unsigned long arg)
2241 {
2242 struct dvb_device *dvbdev = file->private_data;
2243 struct dvb_frontend *fe = dvbdev->priv;
2244 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2245 int err;
2246
2247 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2248 if (down_interruptible(&fepriv->sem))
2249 return -ERESTARTSYS;
2250
2251 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2252
2253 up(&fepriv->sem);
2254 return err;
2255 }
2256
2257 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2258 }
2259 #endif
2260
dtv_set_frontend(struct dvb_frontend * fe)2261 static int dtv_set_frontend(struct dvb_frontend *fe)
2262 {
2263 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2264 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2265 u32 rolloff = 0;
2266
2267 if (dvb_frontend_check_parameters(fe) < 0)
2268 return -EINVAL;
2269
2270 /*
2271 * Initialize output parameters to match the values given by
2272 * the user. FE_SET_FRONTEND triggers an initial frontend event
2273 * with status = 0, which copies output parameters to userspace.
2274 */
2275 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2276
2277 /*
2278 * Be sure that the bandwidth will be filled for all
2279 * non-satellite systems, as tuners need to know what
2280 * low pass/Nyquist half filter should be applied, in
2281 * order to avoid inter-channel noise.
2282 *
2283 * ISDB-T and DVB-T/T2 already sets bandwidth.
2284 * ATSC and DVB-C don't set, so, the core should fill it.
2285 *
2286 * On DVB-C Annex A and C, the bandwidth is a function of
2287 * the roll-off and symbol rate. Annex B defines different
2288 * roll-off factors depending on the modulation. Fortunately,
2289 * Annex B is only used with 6MHz, so there's no need to
2290 * calculate it.
2291 *
2292 * While not officially supported, a side effect of handling it at
2293 * the cache level is that a program could retrieve the bandwidth
2294 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2295 */
2296 switch (c->delivery_system) {
2297 case SYS_ATSC:
2298 case SYS_DVBC_ANNEX_B:
2299 c->bandwidth_hz = 6000000;
2300 break;
2301 case SYS_DVBC_ANNEX_A:
2302 rolloff = 115;
2303 break;
2304 case SYS_DVBC_ANNEX_C:
2305 rolloff = 113;
2306 break;
2307 case SYS_DSS:
2308 rolloff = 120;
2309 break;
2310 case SYS_DVBS:
2311 case SYS_TURBO:
2312 case SYS_ISDBS:
2313 rolloff = 135;
2314 break;
2315 case SYS_DVBS2:
2316 switch (c->rolloff) {
2317 case ROLLOFF_20:
2318 rolloff = 120;
2319 break;
2320 case ROLLOFF_25:
2321 rolloff = 125;
2322 break;
2323 default:
2324 case ROLLOFF_35:
2325 rolloff = 135;
2326 }
2327 break;
2328 default:
2329 break;
2330 }
2331 if (rolloff)
2332 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2333
2334 /* force auto frequency inversion if requested */
2335 if (dvb_force_auto_inversion)
2336 c->inversion = INVERSION_AUTO;
2337
2338 /*
2339 * without hierarchical coding code_rate_LP is irrelevant,
2340 * so we tolerate the otherwise invalid FEC_NONE setting
2341 */
2342 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2343 c->code_rate_LP = FEC_AUTO;
2344
2345 prepare_tuning_algo_parameters(fe);
2346
2347 fepriv->state = FESTATE_RETUNE;
2348
2349 /* Request the search algorithm to search */
2350 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2351
2352 dvb_frontend_clear_events(fe);
2353 dvb_frontend_add_event(fe, 0);
2354 dvb_frontend_wakeup(fe);
2355 fepriv->status = 0;
2356
2357 return 0;
2358 }
2359
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2360 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2361 struct dtv_properties *tvps)
2362 {
2363 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2364 struct dtv_property *tvp = NULL;
2365 struct dtv_frontend_properties getp;
2366 int i, err;
2367
2368 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2369
2370 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2371 __func__, tvps->num);
2372 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2373 __func__, tvps->props);
2374
2375 /*
2376 * Put an arbitrary limit on the number of messages that can
2377 * be sent at once
2378 */
2379 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2380 return -EINVAL;
2381
2382 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2383 if (IS_ERR(tvp))
2384 return PTR_ERR(tvp);
2385
2386 /*
2387 * Let's use our own copy of property cache, in order to
2388 * avoid mangling with DTV zigzag logic, as drivers might
2389 * return crap, if they don't check if the data is available
2390 * before updating the properties cache.
2391 */
2392 if (fepriv->state != FESTATE_IDLE) {
2393 err = dtv_get_frontend(fe, &getp, NULL);
2394 if (err < 0)
2395 goto out;
2396 }
2397 for (i = 0; i < tvps->num; i++) {
2398 err = dtv_property_process_get(fe, &getp,
2399 tvp + i, file);
2400 if (err < 0)
2401 goto out;
2402 }
2403
2404 if (copy_to_user((void __user *)tvps->props, tvp,
2405 tvps->num * sizeof(struct dtv_property))) {
2406 err = -EFAULT;
2407 goto out;
2408 }
2409
2410 err = 0;
2411 out:
2412 kfree(tvp);
2413 return err;
2414 }
2415
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2416 static int dvb_get_frontend(struct dvb_frontend *fe,
2417 struct dvb_frontend_parameters *p_out)
2418 {
2419 struct dtv_frontend_properties getp;
2420
2421 /*
2422 * Let's use our own copy of property cache, in order to
2423 * avoid mangling with DTV zigzag logic, as drivers might
2424 * return crap, if they don't check if the data is available
2425 * before updating the properties cache.
2426 */
2427 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2428
2429 return dtv_get_frontend(fe, &getp, p_out);
2430 }
2431
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2432 static int dvb_frontend_handle_ioctl(struct file *file,
2433 unsigned int cmd, void *parg)
2434 {
2435 struct dvb_device *dvbdev = file->private_data;
2436 struct dvb_frontend *fe = dvbdev->priv;
2437 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2438 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2439 int i, err = -ENOTSUPP;
2440
2441 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2442
2443 switch (cmd) {
2444 case FE_SET_PROPERTY: {
2445 struct dtv_properties *tvps = parg;
2446 struct dtv_property *tvp = NULL;
2447
2448 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2449 __func__, tvps->num);
2450 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2451 __func__, tvps->props);
2452
2453 /*
2454 * Put an arbitrary limit on the number of messages that can
2455 * be sent at once
2456 */
2457 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2458 return -EINVAL;
2459
2460 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2461 if (IS_ERR(tvp))
2462 return PTR_ERR(tvp);
2463
2464 for (i = 0; i < tvps->num; i++) {
2465 err = dtv_property_process_set(fe, file,
2466 (tvp + i)->cmd,
2467 (tvp + i)->u.data);
2468 if (err < 0) {
2469 kfree(tvp);
2470 return err;
2471 }
2472 }
2473 kfree(tvp);
2474 err = 0;
2475 break;
2476 }
2477 case FE_GET_PROPERTY:
2478 err = dvb_get_property(fe, file, parg);
2479 break;
2480
2481 case FE_GET_INFO: {
2482 struct dvb_frontend_info *info = parg;
2483 memset(info, 0, sizeof(*info));
2484
2485 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2486 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2487 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2488 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2489 info->caps = fe->ops.info.caps;
2490 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2491 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2492 &info->frequency_max,
2493 &info->frequency_tolerance);
2494
2495 /*
2496 * Associate the 4 delivery systems supported by DVBv3
2497 * API with their DVBv5 counterpart. For the other standards,
2498 * use the closest type, assuming that it would hopefully
2499 * work with a DVBv3 application.
2500 * It should be noticed that, on multi-frontend devices with
2501 * different types (terrestrial and cable, for example),
2502 * a pure DVBv3 application won't be able to use all delivery
2503 * systems. Yet, changing the DVBv5 cache to the other delivery
2504 * system should be enough for making it work.
2505 */
2506 switch (dvbv3_type(c->delivery_system)) {
2507 case DVBV3_QPSK:
2508 info->type = FE_QPSK;
2509 break;
2510 case DVBV3_ATSC:
2511 info->type = FE_ATSC;
2512 break;
2513 case DVBV3_QAM:
2514 info->type = FE_QAM;
2515 break;
2516 case DVBV3_OFDM:
2517 info->type = FE_OFDM;
2518 break;
2519 default:
2520 dev_err(fe->dvb->device,
2521 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2522 __func__, c->delivery_system);
2523 info->type = FE_OFDM;
2524 }
2525 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2526 __func__, c->delivery_system, info->type);
2527
2528 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2529 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2530 info->caps |= FE_CAN_INVERSION_AUTO;
2531 err = 0;
2532 break;
2533 }
2534
2535 case FE_READ_STATUS: {
2536 enum fe_status *status = parg;
2537
2538 /* if retune was requested but hasn't occurred yet, prevent
2539 * that user get signal state from previous tuning */
2540 if (fepriv->state == FESTATE_RETUNE ||
2541 fepriv->state == FESTATE_ERROR) {
2542 err = 0;
2543 *status = 0;
2544 break;
2545 }
2546
2547 if (fe->ops.read_status)
2548 err = fe->ops.read_status(fe, status);
2549 break;
2550 }
2551
2552 case FE_DISEQC_RESET_OVERLOAD:
2553 if (fe->ops.diseqc_reset_overload) {
2554 err = fe->ops.diseqc_reset_overload(fe);
2555 fepriv->state = FESTATE_DISEQC;
2556 fepriv->status = 0;
2557 }
2558 break;
2559
2560 case FE_DISEQC_SEND_MASTER_CMD:
2561 if (fe->ops.diseqc_send_master_cmd) {
2562 struct dvb_diseqc_master_cmd *cmd = parg;
2563
2564 if (cmd->msg_len > sizeof(cmd->msg)) {
2565 err = -EINVAL;
2566 break;
2567 }
2568 err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2569 fepriv->state = FESTATE_DISEQC;
2570 fepriv->status = 0;
2571 }
2572 break;
2573
2574 case FE_DISEQC_SEND_BURST:
2575 if (fe->ops.diseqc_send_burst) {
2576 err = fe->ops.diseqc_send_burst(fe, (long)parg);
2577 fepriv->state = FESTATE_DISEQC;
2578 fepriv->status = 0;
2579 }
2580 break;
2581
2582 case FE_SET_TONE:
2583 if (fe->ops.set_tone) {
2584 fepriv->tone = (long)parg;
2585 err = fe->ops.set_tone(fe, fepriv->tone);
2586 fepriv->state = FESTATE_DISEQC;
2587 fepriv->status = 0;
2588 }
2589 break;
2590
2591 case FE_SET_VOLTAGE:
2592 if (fe->ops.set_voltage) {
2593 fepriv->voltage = (long)parg;
2594 err = fe->ops.set_voltage(fe, fepriv->voltage);
2595 fepriv->state = FESTATE_DISEQC;
2596 fepriv->status = 0;
2597 }
2598 break;
2599
2600 case FE_DISEQC_RECV_SLAVE_REPLY:
2601 if (fe->ops.diseqc_recv_slave_reply)
2602 err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2603 break;
2604
2605 case FE_ENABLE_HIGH_LNB_VOLTAGE:
2606 if (fe->ops.enable_high_lnb_voltage)
2607 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2608 break;
2609
2610 case FE_SET_FRONTEND_TUNE_MODE:
2611 fepriv->tune_mode_flags = (unsigned long)parg;
2612 err = 0;
2613 break;
2614 /* DEPRECATED dish control ioctls */
2615
2616 case FE_DISHNETWORK_SEND_LEGACY_CMD:
2617 if (fe->ops.dishnetwork_send_legacy_command) {
2618 err = fe->ops.dishnetwork_send_legacy_command(fe,
2619 (unsigned long)parg);
2620 fepriv->state = FESTATE_DISEQC;
2621 fepriv->status = 0;
2622 } else if (fe->ops.set_voltage) {
2623 /*
2624 * NOTE: This is a fallback condition. Some frontends
2625 * (stv0299 for instance) take longer than 8msec to
2626 * respond to a set_voltage command. Those switches
2627 * need custom routines to switch properly. For all
2628 * other frontends, the following should work ok.
2629 * Dish network legacy switches (as used by Dish500)
2630 * are controlled by sending 9-bit command words
2631 * spaced 8msec apart.
2632 * the actual command word is switch/port dependent
2633 * so it is up to the userspace application to send
2634 * the right command.
2635 * The command must always start with a '0' after
2636 * initialization, so parg is 8 bits and does not
2637 * include the initialization or start bit
2638 */
2639 unsigned long swcmd = ((unsigned long)parg) << 1;
2640 ktime_t nexttime;
2641 ktime_t tv[10];
2642 int i;
2643 u8 last = 1;
2644
2645 if (dvb_frontend_debug)
2646 dprintk("switch command: 0x%04lx\n",
2647 swcmd);
2648 nexttime = ktime_get_boottime();
2649 if (dvb_frontend_debug)
2650 tv[0] = nexttime;
2651 /* before sending a command, initialize by sending
2652 * a 32ms 18V to the switch
2653 */
2654 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2655 dvb_frontend_sleep_until(&nexttime, 32000);
2656
2657 for (i = 0; i < 9; i++) {
2658 if (dvb_frontend_debug)
2659 tv[i + 1] = ktime_get_boottime();
2660 if ((swcmd & 0x01) != last) {
2661 /* set voltage to (last ? 13V : 18V) */
2662 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2663 last = (last) ? 0 : 1;
2664 }
2665 swcmd = swcmd >> 1;
2666 if (i != 8)
2667 dvb_frontend_sleep_until(&nexttime, 8000);
2668 }
2669 if (dvb_frontend_debug) {
2670 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2671 fe->dvb->num);
2672 for (i = 1; i < 10; i++)
2673 pr_info("%d: %d\n", i,
2674 (int)ktime_us_delta(tv[i], tv[i - 1]));
2675 }
2676 err = 0;
2677 fepriv->state = FESTATE_DISEQC;
2678 fepriv->status = 0;
2679 }
2680 break;
2681
2682 /* DEPRECATED statistics ioctls */
2683
2684 case FE_READ_BER:
2685 if (fe->ops.read_ber) {
2686 if (fepriv->thread)
2687 err = fe->ops.read_ber(fe, parg);
2688 else
2689 err = -EAGAIN;
2690 }
2691 break;
2692
2693 case FE_READ_SIGNAL_STRENGTH:
2694 if (fe->ops.read_signal_strength) {
2695 if (fepriv->thread)
2696 err = fe->ops.read_signal_strength(fe, parg);
2697 else
2698 err = -EAGAIN;
2699 }
2700 break;
2701
2702 case FE_READ_SNR:
2703 if (fe->ops.read_snr) {
2704 if (fepriv->thread)
2705 err = fe->ops.read_snr(fe, parg);
2706 else
2707 err = -EAGAIN;
2708 }
2709 break;
2710
2711 case FE_READ_UNCORRECTED_BLOCKS:
2712 if (fe->ops.read_ucblocks) {
2713 if (fepriv->thread)
2714 err = fe->ops.read_ucblocks(fe, parg);
2715 else
2716 err = -EAGAIN;
2717 }
2718 break;
2719
2720 /* DEPRECATED DVBv3 ioctls */
2721
2722 case FE_SET_FRONTEND:
2723 err = dvbv3_set_delivery_system(fe);
2724 if (err)
2725 break;
2726
2727 err = dtv_property_cache_sync(fe, c, parg);
2728 if (err)
2729 break;
2730 err = dtv_set_frontend(fe);
2731 break;
2732
2733 case FE_GET_EVENT:
2734 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2735 break;
2736
2737 case FE_GET_FRONTEND:
2738 err = dvb_get_frontend(fe, parg);
2739 break;
2740
2741 default:
2742 return -ENOTSUPP;
2743 } /* switch */
2744
2745 return err;
2746 }
2747
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2748 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2749 {
2750 struct dvb_device *dvbdev = file->private_data;
2751 struct dvb_frontend *fe = dvbdev->priv;
2752 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2753
2754 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2755
2756 poll_wait(file, &fepriv->events.wait_queue, wait);
2757
2758 if (fepriv->events.eventw != fepriv->events.eventr)
2759 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2760
2761 return 0;
2762 }
2763
dvb_frontend_open(struct inode * inode,struct file * file)2764 static int dvb_frontend_open(struct inode *inode, struct file *file)
2765 {
2766 struct dvb_device *dvbdev = file->private_data;
2767 struct dvb_frontend *fe = dvbdev->priv;
2768 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2769 struct dvb_adapter *adapter = fe->dvb;
2770 int ret;
2771
2772 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2773 if (fe->exit == DVB_FE_DEVICE_REMOVED)
2774 return -ENODEV;
2775
2776 if (adapter->mfe_shared == 2) {
2777 mutex_lock(&adapter->mfe_lock);
2778 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2779 if (adapter->mfe_dvbdev &&
2780 !adapter->mfe_dvbdev->writers) {
2781 mutex_unlock(&adapter->mfe_lock);
2782 return -EBUSY;
2783 }
2784 adapter->mfe_dvbdev = dvbdev;
2785 }
2786 } else if (adapter->mfe_shared) {
2787 mutex_lock(&adapter->mfe_lock);
2788
2789 if (!adapter->mfe_dvbdev)
2790 adapter->mfe_dvbdev = dvbdev;
2791
2792 else if (adapter->mfe_dvbdev != dvbdev) {
2793 struct dvb_device
2794 *mfedev = adapter->mfe_dvbdev;
2795 struct dvb_frontend
2796 *mfe = mfedev->priv;
2797 struct dvb_frontend_private
2798 *mfepriv = mfe->frontend_priv;
2799 int mferetry = (dvb_mfe_wait_time << 1);
2800
2801 mutex_unlock(&adapter->mfe_lock);
2802 while (mferetry-- && (mfedev->users != -1 ||
2803 mfepriv->thread)) {
2804 if (msleep_interruptible(500)) {
2805 if (signal_pending(current))
2806 return -EINTR;
2807 }
2808 }
2809
2810 mutex_lock(&adapter->mfe_lock);
2811 if (adapter->mfe_dvbdev != dvbdev) {
2812 mfedev = adapter->mfe_dvbdev;
2813 mfe = mfedev->priv;
2814 mfepriv = mfe->frontend_priv;
2815 if (mfedev->users != -1 ||
2816 mfepriv->thread) {
2817 mutex_unlock(&adapter->mfe_lock);
2818 return -EBUSY;
2819 }
2820 adapter->mfe_dvbdev = dvbdev;
2821 }
2822 }
2823 }
2824
2825 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2826 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2827 goto err0;
2828
2829 /* If we took control of the bus, we need to force
2830 reinitialization. This is because many ts_bus_ctrl()
2831 functions strobe the RESET pin on the demod, and if the
2832 frontend thread already exists then the dvb_init() routine
2833 won't get called (which is what usually does initial
2834 register configuration). */
2835 fepriv->reinitialise = 1;
2836 }
2837
2838 if ((ret = dvb_generic_open(inode, file)) < 0)
2839 goto err1;
2840
2841 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2842 /* normal tune mode when opened R/W */
2843 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2844 fepriv->tone = -1;
2845 fepriv->voltage = -1;
2846
2847 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2848 mutex_lock(&fe->dvb->mdev_lock);
2849 if (fe->dvb->mdev) {
2850 mutex_lock(&fe->dvb->mdev->graph_mutex);
2851 if (fe->dvb->mdev->enable_source)
2852 ret = fe->dvb->mdev->enable_source(
2853 dvbdev->entity,
2854 &fepriv->pipe);
2855 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2856 if (ret) {
2857 mutex_unlock(&fe->dvb->mdev_lock);
2858 dev_err(fe->dvb->device,
2859 "Tuner is busy. Error %d\n", ret);
2860 goto err2;
2861 }
2862 }
2863 mutex_unlock(&fe->dvb->mdev_lock);
2864 #endif
2865 ret = dvb_frontend_start(fe);
2866 if (ret)
2867 goto err3;
2868
2869 /* empty event queue */
2870 fepriv->events.eventr = fepriv->events.eventw = 0;
2871 }
2872
2873 dvb_frontend_get(fe);
2874
2875 if (adapter->mfe_shared)
2876 mutex_unlock(&adapter->mfe_lock);
2877 return ret;
2878
2879 err3:
2880 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2881 mutex_lock(&fe->dvb->mdev_lock);
2882 if (fe->dvb->mdev) {
2883 mutex_lock(&fe->dvb->mdev->graph_mutex);
2884 if (fe->dvb->mdev->disable_source)
2885 fe->dvb->mdev->disable_source(dvbdev->entity);
2886 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2887 }
2888 mutex_unlock(&fe->dvb->mdev_lock);
2889 err2:
2890 #endif
2891 dvb_generic_release(inode, file);
2892 err1:
2893 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2894 fe->ops.ts_bus_ctrl(fe, 0);
2895 err0:
2896 if (adapter->mfe_shared)
2897 mutex_unlock(&adapter->mfe_lock);
2898 return ret;
2899 }
2900
dvb_frontend_release(struct inode * inode,struct file * file)2901 static int dvb_frontend_release(struct inode *inode, struct file *file)
2902 {
2903 struct dvb_device *dvbdev = file->private_data;
2904 struct dvb_frontend *fe = dvbdev->priv;
2905 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2906 int ret;
2907
2908 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2909
2910 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2911 fepriv->release_jiffies = jiffies;
2912 mb();
2913 }
2914
2915 ret = dvb_generic_release(inode, file);
2916
2917 if (dvbdev->users == -1) {
2918 wake_up(&fepriv->wait_queue);
2919 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2920 mutex_lock(&fe->dvb->mdev_lock);
2921 if (fe->dvb->mdev) {
2922 mutex_lock(&fe->dvb->mdev->graph_mutex);
2923 if (fe->dvb->mdev->disable_source)
2924 fe->dvb->mdev->disable_source(dvbdev->entity);
2925 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2926 }
2927 mutex_unlock(&fe->dvb->mdev_lock);
2928 #endif
2929 if (fe->exit != DVB_FE_NO_EXIT)
2930 wake_up(&dvbdev->wait_queue);
2931 if (fe->ops.ts_bus_ctrl)
2932 fe->ops.ts_bus_ctrl(fe, 0);
2933 }
2934
2935 dvb_frontend_put(fe);
2936
2937 return ret;
2938 }
2939
2940 static const struct file_operations dvb_frontend_fops = {
2941 .owner = THIS_MODULE,
2942 .unlocked_ioctl = dvb_frontend_ioctl,
2943 #ifdef CONFIG_COMPAT
2944 .compat_ioctl = dvb_frontend_compat_ioctl,
2945 #endif
2946 .poll = dvb_frontend_poll,
2947 .open = dvb_frontend_open,
2948 .release = dvb_frontend_release,
2949 .llseek = noop_llseek,
2950 };
2951
dvb_frontend_suspend(struct dvb_frontend * fe)2952 int dvb_frontend_suspend(struct dvb_frontend *fe)
2953 {
2954 int ret = 0;
2955
2956 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2957 fe->id);
2958
2959 if (fe->ops.tuner_ops.suspend)
2960 ret = fe->ops.tuner_ops.suspend(fe);
2961 else if (fe->ops.tuner_ops.sleep)
2962 ret = fe->ops.tuner_ops.sleep(fe);
2963
2964 if (fe->ops.suspend)
2965 ret = fe->ops.suspend(fe);
2966 else if (fe->ops.sleep)
2967 ret = fe->ops.sleep(fe);
2968
2969 return ret;
2970 }
2971 EXPORT_SYMBOL(dvb_frontend_suspend);
2972
dvb_frontend_resume(struct dvb_frontend * fe)2973 int dvb_frontend_resume(struct dvb_frontend *fe)
2974 {
2975 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2976 int ret = 0;
2977
2978 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2979 fe->id);
2980
2981 fe->exit = DVB_FE_DEVICE_RESUME;
2982 if (fe->ops.resume)
2983 ret = fe->ops.resume(fe);
2984 else if (fe->ops.init)
2985 ret = fe->ops.init(fe);
2986
2987 if (fe->ops.tuner_ops.resume)
2988 ret = fe->ops.tuner_ops.resume(fe);
2989 else if (fe->ops.tuner_ops.init)
2990 ret = fe->ops.tuner_ops.init(fe);
2991
2992 if (fe->ops.set_tone && fepriv->tone != -1)
2993 fe->ops.set_tone(fe, fepriv->tone);
2994 if (fe->ops.set_voltage && fepriv->voltage != -1)
2995 fe->ops.set_voltage(fe, fepriv->voltage);
2996
2997 fe->exit = DVB_FE_NO_EXIT;
2998 fepriv->state = FESTATE_RETUNE;
2999 dvb_frontend_wakeup(fe);
3000
3001 return ret;
3002 }
3003 EXPORT_SYMBOL(dvb_frontend_resume);
3004
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)3005 int dvb_register_frontend(struct dvb_adapter *dvb,
3006 struct dvb_frontend *fe)
3007 {
3008 struct dvb_frontend_private *fepriv;
3009 const struct dvb_device dvbdev_template = {
3010 .users = ~0,
3011 .writers = 1,
3012 .readers = (~0) - 1,
3013 .fops = &dvb_frontend_fops,
3014 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3015 .name = fe->ops.info.name,
3016 #endif
3017 };
3018 int ret;
3019
3020 dev_dbg(dvb->device, "%s:\n", __func__);
3021
3022 if (mutex_lock_interruptible(&frontend_mutex))
3023 return -ERESTARTSYS;
3024
3025 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3026 if (!fe->frontend_priv) {
3027 mutex_unlock(&frontend_mutex);
3028 return -ENOMEM;
3029 }
3030 fepriv = fe->frontend_priv;
3031
3032 kref_init(&fe->refcount);
3033
3034 /*
3035 * After initialization, there need to be two references: one
3036 * for dvb_unregister_frontend(), and another one for
3037 * dvb_frontend_detach().
3038 */
3039 dvb_frontend_get(fe);
3040
3041 sema_init(&fepriv->sem, 1);
3042 init_waitqueue_head(&fepriv->wait_queue);
3043 init_waitqueue_head(&fepriv->events.wait_queue);
3044 mutex_init(&fepriv->events.mtx);
3045 fe->dvb = dvb;
3046 fepriv->inversion = INVERSION_OFF;
3047
3048 dev_info(fe->dvb->device,
3049 "DVB: registering adapter %i frontend %i (%s)...\n",
3050 fe->dvb->num, fe->id, fe->ops.info.name);
3051
3052 ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3053 fe, DVB_DEVICE_FRONTEND, 0);
3054 if (ret) {
3055 dvb_frontend_put(fe);
3056 mutex_unlock(&frontend_mutex);
3057 return ret;
3058 }
3059
3060 /*
3061 * Initialize the cache to the proper values according with the
3062 * first supported delivery system (ops->delsys[0])
3063 */
3064
3065 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3066 dvb_frontend_clear_cache(fe);
3067
3068 mutex_unlock(&frontend_mutex);
3069 return 0;
3070 }
3071 EXPORT_SYMBOL(dvb_register_frontend);
3072
dvb_unregister_frontend(struct dvb_frontend * fe)3073 int dvb_unregister_frontend(struct dvb_frontend *fe)
3074 {
3075 struct dvb_frontend_private *fepriv = fe->frontend_priv;
3076
3077 dev_dbg(fe->dvb->device, "%s:\n", __func__);
3078
3079 mutex_lock(&frontend_mutex);
3080 dvb_frontend_stop(fe);
3081 dvb_remove_device(fepriv->dvbdev);
3082
3083 /* fe is invalid now */
3084 mutex_unlock(&frontend_mutex);
3085 dvb_frontend_put(fe);
3086 return 0;
3087 }
3088 EXPORT_SYMBOL(dvb_unregister_frontend);
3089
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3090 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3091 void (*release)(struct dvb_frontend *fe))
3092 {
3093 if (release) {
3094 release(fe);
3095 #ifdef CONFIG_MEDIA_ATTACH
3096 dvb_detach(release);
3097 #endif
3098 }
3099 }
3100
dvb_frontend_detach(struct dvb_frontend * fe)3101 void dvb_frontend_detach(struct dvb_frontend *fe)
3102 {
3103 dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3104 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3105 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3106 dvb_frontend_put(fe);
3107 }
3108 EXPORT_SYMBOL(dvb_frontend_detach);
3109
