1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dvb_frontend.c: DVB frontend tuning interface/thread
4 *
5 * Copyright (C) 1999-2001 Ralph Metzler
6 * Marcus Metzler
7 * Holger Waechtler
8 * for convergence integrated media GmbH
9 *
10 * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11 */
12
13 /* Enables DVBv3 compatibility bits at the headers */
14 #define __DVB_CORE__
15
16 #define pr_fmt(fmt) "dvb_frontend: " fmt
17
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/wait.h>
22 #include <linux/slab.h>
23 #include <linux/poll.h>
24 #include <linux/semaphore.h>
25 #include <linux/module.h>
26 #include <linux/list.h>
27 #include <linux/freezer.h>
28 #include <linux/jiffies.h>
29 #include <linux/kthread.h>
30 #include <linux/ktime.h>
31 #include <linux/compat.h>
32 #include <asm/processor.h>
33
34 #include <media/dvb_frontend.h>
35 #include <media/dvbdev.h>
36 #include <linux/dvb/version.h>
37
38 static int dvb_frontend_debug;
39 static int dvb_shutdown_timeout;
40 static int dvb_force_auto_inversion;
41 static int dvb_override_tune_delay;
42 static int dvb_powerdown_on_sleep = 1;
43 static int dvb_mfe_wait_time = 5;
44
45 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
46 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
47 module_param(dvb_shutdown_timeout, int, 0644);
48 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
49 module_param(dvb_force_auto_inversion, int, 0644);
50 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
51 module_param(dvb_override_tune_delay, int, 0644);
52 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
53 module_param(dvb_powerdown_on_sleep, int, 0644);
54 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
55 module_param(dvb_mfe_wait_time, int, 0644);
56 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
57
58 #define dprintk(fmt, arg...) \
59 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
60
61 #define FESTATE_IDLE 1
62 #define FESTATE_RETUNE 2
63 #define FESTATE_TUNING_FAST 4
64 #define FESTATE_TUNING_SLOW 8
65 #define FESTATE_TUNED 16
66 #define FESTATE_ZIGZAG_FAST 32
67 #define FESTATE_ZIGZAG_SLOW 64
68 #define FESTATE_DISEQC 128
69 #define FESTATE_ERROR 256
70 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
71 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
72 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
73 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
74
75 /*
76 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
77 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
78 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
79 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
80 * FESTATE_TUNED. The frontend has successfully locked on.
81 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
82 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
83 * FESTATE_DISEQC. A DISEQC command has just been issued.
84 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
85 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
86 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
87 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
88 */
89
90 static DEFINE_MUTEX(frontend_mutex);
91
92 struct dvb_frontend_private {
93 /* thread/frontend values */
94 struct dvb_device *dvbdev;
95 struct dvb_frontend_parameters parameters_out;
96 struct dvb_fe_events events;
97 struct semaphore sem;
98 struct list_head list_head;
99 wait_queue_head_t wait_queue;
100 struct task_struct *thread;
101 unsigned long release_jiffies;
102 unsigned int wakeup;
103 enum fe_status status;
104 unsigned long tune_mode_flags;
105 unsigned int delay;
106 unsigned int reinitialise;
107 int tone;
108 int voltage;
109
110 /* swzigzag values */
111 unsigned int state;
112 unsigned int bending;
113 int lnb_drift;
114 unsigned int inversion;
115 unsigned int auto_step;
116 unsigned int auto_sub_step;
117 unsigned int started_auto_step;
118 unsigned int min_delay;
119 unsigned int max_drift;
120 unsigned int step_size;
121 int quality;
122 unsigned int check_wrapped;
123 enum dvbfe_search algo_status;
124
125 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
126 struct media_pipeline pipe;
127 #endif
128 };
129
130 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
131 void (*release)(struct dvb_frontend *fe));
132
__dvb_frontend_free(struct dvb_frontend * fe)133 static void __dvb_frontend_free(struct dvb_frontend *fe)
134 {
135 struct dvb_frontend_private *fepriv = fe->frontend_priv;
136
137 if (fepriv)
138 dvb_free_device(fepriv->dvbdev);
139
140 dvb_frontend_invoke_release(fe, fe->ops.release);
141
142 kfree(fepriv);
143 }
144
dvb_frontend_free(struct kref * ref)145 static void dvb_frontend_free(struct kref *ref)
146 {
147 struct dvb_frontend *fe =
148 container_of(ref, struct dvb_frontend, refcount);
149
150 __dvb_frontend_free(fe);
151 }
152
dvb_frontend_put(struct dvb_frontend * fe)153 static void dvb_frontend_put(struct dvb_frontend *fe)
154 {
155 /* call detach before dropping the reference count */
156 if (fe->ops.detach)
157 fe->ops.detach(fe);
158 /*
159 * Check if the frontend was registered, as otherwise
160 * kref was not initialized yet.
161 */
162 if (fe->frontend_priv)
163 kref_put(&fe->refcount, dvb_frontend_free);
164 else
165 __dvb_frontend_free(fe);
166 }
167
dvb_frontend_get(struct dvb_frontend * fe)168 static void dvb_frontend_get(struct dvb_frontend *fe)
169 {
170 kref_get(&fe->refcount);
171 }
172
173 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
174 static int dtv_get_frontend(struct dvb_frontend *fe,
175 struct dtv_frontend_properties *c,
176 struct dvb_frontend_parameters *p_out);
177 static int
178 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
179 const struct dtv_frontend_properties *c,
180 struct dvb_frontend_parameters *p);
181
has_get_frontend(struct dvb_frontend * fe)182 static bool has_get_frontend(struct dvb_frontend *fe)
183 {
184 return fe->ops.get_frontend;
185 }
186
187 /*
188 * Due to DVBv3 API calls, a delivery system should be mapped into one of
189 * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
190 * otherwise, a DVBv3 call will fail.
191 */
192 enum dvbv3_emulation_type {
193 DVBV3_UNKNOWN,
194 DVBV3_QPSK,
195 DVBV3_QAM,
196 DVBV3_OFDM,
197 DVBV3_ATSC,
198 };
199
dvbv3_type(u32 delivery_system)200 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
201 {
202 switch (delivery_system) {
203 case SYS_DVBC_ANNEX_A:
204 case SYS_DVBC_ANNEX_C:
205 return DVBV3_QAM;
206 case SYS_DVBS:
207 case SYS_DVBS2:
208 case SYS_TURBO:
209 case SYS_ISDBS:
210 case SYS_DSS:
211 return DVBV3_QPSK;
212 case SYS_DVBT:
213 case SYS_DVBT2:
214 case SYS_ISDBT:
215 case SYS_DTMB:
216 return DVBV3_OFDM;
217 case SYS_ATSC:
218 case SYS_ATSCMH:
219 case SYS_DVBC_ANNEX_B:
220 return DVBV3_ATSC;
221 case SYS_UNDEFINED:
222 case SYS_ISDBC:
223 case SYS_DVBH:
224 case SYS_DAB:
225 default:
226 /*
227 * Doesn't know how to emulate those types and/or
228 * there's no frontend driver from this type yet
229 * with some emulation code, so, we're not sure yet how
230 * to handle them, or they're not compatible with a DVBv3 call.
231 */
232 return DVBV3_UNKNOWN;
233 }
234 }
235
dvb_frontend_add_event(struct dvb_frontend * fe,enum fe_status status)236 static void dvb_frontend_add_event(struct dvb_frontend *fe,
237 enum fe_status status)
238 {
239 struct dvb_frontend_private *fepriv = fe->frontend_priv;
240 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
241 struct dvb_fe_events *events = &fepriv->events;
242 struct dvb_frontend_event *e;
243 int wp;
244
245 dev_dbg(fe->dvb->device, "%s:\n", __func__);
246
247 if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
248 dtv_get_frontend(fe, c, &fepriv->parameters_out);
249
250 mutex_lock(&events->mtx);
251
252 wp = (events->eventw + 1) % MAX_EVENT;
253 if (wp == events->eventr) {
254 events->overflow = 1;
255 events->eventr = (events->eventr + 1) % MAX_EVENT;
256 }
257
258 e = &events->events[events->eventw];
259 e->status = status;
260 e->parameters = fepriv->parameters_out;
261
262 events->eventw = wp;
263
264 mutex_unlock(&events->mtx);
265
266 wake_up_interruptible(&events->wait_queue);
267 }
268
dvb_frontend_test_event(struct dvb_frontend_private * fepriv,struct dvb_fe_events * events)269 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
270 struct dvb_fe_events *events)
271 {
272 int ret;
273
274 up(&fepriv->sem);
275 ret = events->eventw != events->eventr;
276 down(&fepriv->sem);
277
278 return ret;
279 }
280
dvb_frontend_get_event(struct dvb_frontend * fe,struct dvb_frontend_event * event,int flags)281 static int dvb_frontend_get_event(struct dvb_frontend *fe,
282 struct dvb_frontend_event *event, int flags)
283 {
284 struct dvb_frontend_private *fepriv = fe->frontend_priv;
285 struct dvb_fe_events *events = &fepriv->events;
286
287 dev_dbg(fe->dvb->device, "%s:\n", __func__);
288
289 if (events->overflow) {
290 events->overflow = 0;
291 return -EOVERFLOW;
292 }
293
294 if (events->eventw == events->eventr) {
295 int ret;
296
297 if (flags & O_NONBLOCK)
298 return -EWOULDBLOCK;
299
300 ret = wait_event_interruptible(events->wait_queue,
301 dvb_frontend_test_event(fepriv, events));
302
303 if (ret < 0)
304 return ret;
305 }
306
307 mutex_lock(&events->mtx);
308 *event = events->events[events->eventr];
309 events->eventr = (events->eventr + 1) % MAX_EVENT;
310 mutex_unlock(&events->mtx);
311
312 return 0;
313 }
314
dvb_frontend_clear_events(struct dvb_frontend * fe)315 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
316 {
317 struct dvb_frontend_private *fepriv = fe->frontend_priv;
318 struct dvb_fe_events *events = &fepriv->events;
319
320 mutex_lock(&events->mtx);
321 events->eventr = events->eventw;
322 mutex_unlock(&events->mtx);
323 }
324
dvb_frontend_init(struct dvb_frontend * fe)325 static void dvb_frontend_init(struct dvb_frontend *fe)
326 {
327 dev_dbg(fe->dvb->device,
328 "%s: initialising adapter %i frontend %i (%s)...\n",
329 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
330
331 if (fe->ops.init)
332 fe->ops.init(fe);
333 if (fe->ops.tuner_ops.init) {
334 if (fe->ops.i2c_gate_ctrl)
335 fe->ops.i2c_gate_ctrl(fe, 1);
336 fe->ops.tuner_ops.init(fe);
337 if (fe->ops.i2c_gate_ctrl)
338 fe->ops.i2c_gate_ctrl(fe, 0);
339 }
340 }
341
dvb_frontend_reinitialise(struct dvb_frontend * fe)342 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
343 {
344 struct dvb_frontend_private *fepriv = fe->frontend_priv;
345
346 fepriv->reinitialise = 1;
347 dvb_frontend_wakeup(fe);
348 }
349 EXPORT_SYMBOL(dvb_frontend_reinitialise);
350
dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private * fepriv,int locked)351 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
352 {
353 int q2;
354 struct dvb_frontend *fe = fepriv->dvbdev->priv;
355
356 dev_dbg(fe->dvb->device, "%s:\n", __func__);
357
358 if (locked)
359 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
360 else
361 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
362
363 q2 = fepriv->quality - 128;
364 q2 *= q2;
365
366 fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
367 }
368
369 /**
370 * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
371 * parameters.
372 *
373 * @fe: The frontend concerned.
374 * @check_wrapped: Checks if an iteration has completed.
375 * DO NOT SET ON THE FIRST ATTEMPT.
376 *
377 * return: Number of complete iterations that have been performed.
378 */
dvb_frontend_swzigzag_autotune(struct dvb_frontend * fe,int check_wrapped)379 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
380 {
381 int autoinversion;
382 int ready = 0;
383 int fe_set_err = 0;
384 struct dvb_frontend_private *fepriv = fe->frontend_priv;
385 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
386 int original_inversion = c->inversion;
387 u32 original_frequency = c->frequency;
388
389 /* are we using autoinversion? */
390 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
391 (c->inversion == INVERSION_AUTO));
392
393 /* setup parameters correctly */
394 while (!ready) {
395 /* calculate the lnb_drift */
396 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
397
398 /* wrap the auto_step if we've exceeded the maximum drift */
399 if (fepriv->lnb_drift > fepriv->max_drift) {
400 fepriv->auto_step = 0;
401 fepriv->auto_sub_step = 0;
402 fepriv->lnb_drift = 0;
403 }
404
405 /* perform inversion and +/- zigzag */
406 switch (fepriv->auto_sub_step) {
407 case 0:
408 /* try with the current inversion and current drift setting */
409 ready = 1;
410 break;
411
412 case 1:
413 if (!autoinversion) break;
414
415 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
416 ready = 1;
417 break;
418
419 case 2:
420 if (fepriv->lnb_drift == 0) break;
421
422 fepriv->lnb_drift = -fepriv->lnb_drift;
423 ready = 1;
424 break;
425
426 case 3:
427 if (fepriv->lnb_drift == 0) break;
428 if (!autoinversion) break;
429
430 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
431 fepriv->lnb_drift = -fepriv->lnb_drift;
432 ready = 1;
433 break;
434
435 default:
436 fepriv->auto_step++;
437 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
438 break;
439 }
440
441 if (!ready) fepriv->auto_sub_step++;
442 }
443
444 /* if this attempt would hit where we started, indicate a complete
445 * iteration has occurred */
446 if ((fepriv->auto_step == fepriv->started_auto_step) &&
447 (fepriv->auto_sub_step == 0) && check_wrapped) {
448 return 1;
449 }
450
451 dev_dbg(fe->dvb->device,
452 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
453 __func__, fepriv->lnb_drift, fepriv->inversion,
454 fepriv->auto_step, fepriv->auto_sub_step,
455 fepriv->started_auto_step);
456
457 /* set the frontend itself */
458 c->frequency += fepriv->lnb_drift;
459 if (autoinversion)
460 c->inversion = fepriv->inversion;
461 tmp = *c;
462 if (fe->ops.set_frontend)
463 fe_set_err = fe->ops.set_frontend(fe);
464 *c = tmp;
465 if (fe_set_err < 0) {
466 fepriv->state = FESTATE_ERROR;
467 return fe_set_err;
468 }
469
470 c->frequency = original_frequency;
471 c->inversion = original_inversion;
472
473 fepriv->auto_sub_step++;
474 return 0;
475 }
476
dvb_frontend_swzigzag(struct dvb_frontend * fe)477 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
478 {
479 enum fe_status s = FE_NONE;
480 int retval = 0;
481 struct dvb_frontend_private *fepriv = fe->frontend_priv;
482 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
483
484 /* if we've got no parameters, just keep idling */
485 if (fepriv->state & FESTATE_IDLE) {
486 fepriv->delay = 3 * HZ;
487 fepriv->quality = 0;
488 return;
489 }
490
491 /* in SCAN mode, we just set the frontend when asked and leave it alone */
492 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
493 if (fepriv->state & FESTATE_RETUNE) {
494 tmp = *c;
495 if (fe->ops.set_frontend)
496 retval = fe->ops.set_frontend(fe);
497 *c = tmp;
498 if (retval < 0)
499 fepriv->state = FESTATE_ERROR;
500 else
501 fepriv->state = FESTATE_TUNED;
502 }
503 fepriv->delay = 3 * HZ;
504 fepriv->quality = 0;
505 return;
506 }
507
508 /* get the frontend status */
509 if (fepriv->state & FESTATE_RETUNE) {
510 s = 0;
511 } else {
512 if (fe->ops.read_status)
513 fe->ops.read_status(fe, &s);
514 if (s != fepriv->status) {
515 dvb_frontend_add_event(fe, s);
516 fepriv->status = s;
517 }
518 }
519
520 /* if we're not tuned, and we have a lock, move to the TUNED state */
521 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
522 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
523 fepriv->state = FESTATE_TUNED;
524
525 /* if we're tuned, then we have determined the correct inversion */
526 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
527 (c->inversion == INVERSION_AUTO)) {
528 c->inversion = fepriv->inversion;
529 }
530 return;
531 }
532
533 /* if we are tuned already, check we're still locked */
534 if (fepriv->state & FESTATE_TUNED) {
535 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
536
537 /* we're tuned, and the lock is still good... */
538 if (s & FE_HAS_LOCK) {
539 return;
540 } else { /* if we _WERE_ tuned, but now don't have a lock */
541 fepriv->state = FESTATE_ZIGZAG_FAST;
542 fepriv->started_auto_step = fepriv->auto_step;
543 fepriv->check_wrapped = 0;
544 }
545 }
546
547 /* don't actually do anything if we're in the LOSTLOCK state,
548 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
549 if ((fepriv->state & FESTATE_LOSTLOCK) &&
550 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
551 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
552 return;
553 }
554
555 /* don't do anything if we're in the DISEQC state, since this
556 * might be someone with a motorized dish controlled by DISEQC.
557 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
558 if (fepriv->state & FESTATE_DISEQC) {
559 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
560 return;
561 }
562
563 /* if we're in the RETUNE state, set everything up for a brand
564 * new scan, keeping the current inversion setting, as the next
565 * tune is _very_ likely to require the same */
566 if (fepriv->state & FESTATE_RETUNE) {
567 fepriv->lnb_drift = 0;
568 fepriv->auto_step = 0;
569 fepriv->auto_sub_step = 0;
570 fepriv->started_auto_step = 0;
571 fepriv->check_wrapped = 0;
572 }
573
574 /* fast zigzag. */
575 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
576 fepriv->delay = fepriv->min_delay;
577
578 /* perform a tune */
579 retval = dvb_frontend_swzigzag_autotune(fe,
580 fepriv->check_wrapped);
581 if (retval < 0) {
582 return;
583 } else if (retval) {
584 /* OK, if we've run out of trials at the fast speed.
585 * Drop back to slow for the _next_ attempt */
586 fepriv->state = FESTATE_SEARCHING_SLOW;
587 fepriv->started_auto_step = fepriv->auto_step;
588 return;
589 }
590 fepriv->check_wrapped = 1;
591
592 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
593 * This ensures we cannot return from an
594 * FE_SET_FRONTEND ioctl before the first frontend tune
595 * occurs */
596 if (fepriv->state & FESTATE_RETUNE) {
597 fepriv->state = FESTATE_TUNING_FAST;
598 }
599 }
600
601 /* slow zigzag */
602 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
603 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
604
605 /* Note: don't bother checking for wrapping; we stay in this
606 * state until we get a lock */
607 dvb_frontend_swzigzag_autotune(fe, 0);
608 }
609 }
610
dvb_frontend_is_exiting(struct dvb_frontend * fe)611 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
612 {
613 struct dvb_frontend_private *fepriv = fe->frontend_priv;
614
615 if (fe->exit != DVB_FE_NO_EXIT)
616 return 1;
617
618 if (fepriv->dvbdev->writers == 1)
619 if (time_after_eq(jiffies, fepriv->release_jiffies +
620 dvb_shutdown_timeout * HZ))
621 return 1;
622
623 return 0;
624 }
625
dvb_frontend_should_wakeup(struct dvb_frontend * fe)626 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
627 {
628 struct dvb_frontend_private *fepriv = fe->frontend_priv;
629
630 if (fepriv->wakeup) {
631 fepriv->wakeup = 0;
632 return 1;
633 }
634 return dvb_frontend_is_exiting(fe);
635 }
636
dvb_frontend_wakeup(struct dvb_frontend * fe)637 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
638 {
639 struct dvb_frontend_private *fepriv = fe->frontend_priv;
640
641 fepriv->wakeup = 1;
642 wake_up_interruptible(&fepriv->wait_queue);
643 }
644
dvb_frontend_thread(void * data)645 static int dvb_frontend_thread(void *data)
646 {
647 struct dvb_frontend *fe = data;
648 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
649 struct dvb_frontend_private *fepriv = fe->frontend_priv;
650 enum fe_status s = FE_NONE;
651 enum dvbfe_algo algo;
652 bool re_tune = false;
653 bool semheld = false;
654
655 dev_dbg(fe->dvb->device, "%s:\n", __func__);
656
657 fepriv->check_wrapped = 0;
658 fepriv->quality = 0;
659 fepriv->delay = 3 * HZ;
660 fepriv->status = 0;
661 fepriv->wakeup = 0;
662 fepriv->reinitialise = 0;
663
664 dvb_frontend_init(fe);
665
666 set_freezable();
667 while (1) {
668 up(&fepriv->sem); /* is locked when we enter the thread... */
669 restart:
670 wait_event_interruptible_timeout(fepriv->wait_queue,
671 dvb_frontend_should_wakeup(fe) ||
672 kthread_should_stop() ||
673 freezing(current),
674 fepriv->delay);
675
676 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
677 /* got signal or quitting */
678 if (!down_interruptible(&fepriv->sem))
679 semheld = true;
680 fe->exit = DVB_FE_NORMAL_EXIT;
681 break;
682 }
683
684 if (try_to_freeze())
685 goto restart;
686
687 if (down_interruptible(&fepriv->sem))
688 break;
689
690 if (fepriv->reinitialise) {
691 dvb_frontend_init(fe);
692 if (fe->ops.set_tone && fepriv->tone != -1)
693 fe->ops.set_tone(fe, fepriv->tone);
694 if (fe->ops.set_voltage && fepriv->voltage != -1)
695 fe->ops.set_voltage(fe, fepriv->voltage);
696 fepriv->reinitialise = 0;
697 }
698
699 /* do an iteration of the tuning loop */
700 if (fe->ops.get_frontend_algo) {
701 algo = fe->ops.get_frontend_algo(fe);
702 switch (algo) {
703 case DVBFE_ALGO_HW:
704 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
705
706 if (fepriv->state & FESTATE_RETUNE) {
707 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
708 re_tune = true;
709 fepriv->state = FESTATE_TUNED;
710 } else {
711 re_tune = false;
712 }
713
714 if (fe->ops.tune)
715 fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
716
717 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
718 dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
719 dvb_frontend_add_event(fe, s);
720 fepriv->status = s;
721 }
722 break;
723 case DVBFE_ALGO_SW:
724 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
725 dvb_frontend_swzigzag(fe);
726 break;
727 case DVBFE_ALGO_CUSTOM:
728 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
729 if (fepriv->state & FESTATE_RETUNE) {
730 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
731 fepriv->state = FESTATE_TUNED;
732 }
733 /* Case where we are going to search for a carrier
734 * User asked us to retune again for some reason, possibly
735 * requesting a search with a new set of parameters
736 */
737 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
738 if (fe->ops.search) {
739 fepriv->algo_status = fe->ops.search(fe);
740 /* We did do a search as was requested, the flags are
741 * now unset as well and has the flags wrt to search.
742 */
743 } else {
744 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
745 }
746 }
747 /* Track the carrier if the search was successful */
748 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
749 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
750 fepriv->delay = HZ / 2;
751 }
752 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
753 fe->ops.read_status(fe, &s);
754 if (s != fepriv->status) {
755 dvb_frontend_add_event(fe, s); /* update event list */
756 fepriv->status = s;
757 if (!(s & FE_HAS_LOCK)) {
758 fepriv->delay = HZ / 10;
759 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
760 } else {
761 fepriv->delay = 60 * HZ;
762 }
763 }
764 break;
765 default:
766 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
767 break;
768 }
769 } else {
770 dvb_frontend_swzigzag(fe);
771 }
772 }
773
774 if (dvb_powerdown_on_sleep) {
775 if (fe->ops.set_voltage)
776 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
777 if (fe->ops.tuner_ops.sleep) {
778 if (fe->ops.i2c_gate_ctrl)
779 fe->ops.i2c_gate_ctrl(fe, 1);
780 fe->ops.tuner_ops.sleep(fe);
781 if (fe->ops.i2c_gate_ctrl)
782 fe->ops.i2c_gate_ctrl(fe, 0);
783 }
784 if (fe->ops.sleep)
785 fe->ops.sleep(fe);
786 }
787
788 fepriv->thread = NULL;
789 if (kthread_should_stop())
790 fe->exit = DVB_FE_DEVICE_REMOVED;
791 else
792 fe->exit = DVB_FE_NO_EXIT;
793 mb();
794
795 if (semheld)
796 up(&fepriv->sem);
797 dvb_frontend_wakeup(fe);
798 return 0;
799 }
800
dvb_frontend_stop(struct dvb_frontend * fe)801 static void dvb_frontend_stop(struct dvb_frontend *fe)
802 {
803 struct dvb_frontend_private *fepriv = fe->frontend_priv;
804
805 dev_dbg(fe->dvb->device, "%s:\n", __func__);
806
807 mutex_lock(&fe->remove_mutex);
808
809 if (fe->exit != DVB_FE_DEVICE_REMOVED)
810 fe->exit = DVB_FE_NORMAL_EXIT;
811 mb();
812
813 if (!fepriv->thread)
814 return;
815
816 kthread_stop(fepriv->thread);
817
818 mutex_unlock(&fe->remove_mutex);
819
820 if (fepriv->dvbdev->users < -1) {
821 wait_event(fepriv->dvbdev->wait_queue,
822 fepriv->dvbdev->users == -1);
823 }
824
825 sema_init(&fepriv->sem, 1);
826 fepriv->state = FESTATE_IDLE;
827
828 /* paranoia check in case a signal arrived */
829 if (fepriv->thread)
830 dev_warn(fe->dvb->device,
831 "dvb_frontend_stop: warning: thread %p won't exit\n",
832 fepriv->thread);
833 }
834
835 /*
836 * Sleep for the amount of time given by add_usec parameter
837 *
838 * This needs to be as precise as possible, as it affects the detection of
839 * the dish tone command at the satellite subsystem. The precision is improved
840 * by using a scheduled msleep followed by udelay for the remainder.
841 */
dvb_frontend_sleep_until(ktime_t * waketime,u32 add_usec)842 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
843 {
844 s32 delta;
845
846 *waketime = ktime_add_us(*waketime, add_usec);
847 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
848 if (delta > 2500) {
849 msleep((delta - 1500) / 1000);
850 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
851 }
852 if (delta > 0)
853 udelay(delta);
854 }
855 EXPORT_SYMBOL(dvb_frontend_sleep_until);
856
dvb_frontend_start(struct dvb_frontend * fe)857 static int dvb_frontend_start(struct dvb_frontend *fe)
858 {
859 int ret;
860 struct dvb_frontend_private *fepriv = fe->frontend_priv;
861 struct task_struct *fe_thread;
862
863 dev_dbg(fe->dvb->device, "%s:\n", __func__);
864
865 if (fepriv->thread) {
866 if (fe->exit == DVB_FE_NO_EXIT)
867 return 0;
868 else
869 dvb_frontend_stop(fe);
870 }
871
872 if (signal_pending(current))
873 return -EINTR;
874 if (down_interruptible(&fepriv->sem))
875 return -EINTR;
876
877 fepriv->state = FESTATE_IDLE;
878 fe->exit = DVB_FE_NO_EXIT;
879 fepriv->thread = NULL;
880 mb();
881
882 fe_thread = kthread_run(dvb_frontend_thread, fe,
883 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
884 if (IS_ERR(fe_thread)) {
885 ret = PTR_ERR(fe_thread);
886 dev_warn(fe->dvb->device,
887 "dvb_frontend_start: failed to start kthread (%d)\n",
888 ret);
889 up(&fepriv->sem);
890 return ret;
891 }
892 fepriv->thread = fe_thread;
893 return 0;
894 }
895
dvb_frontend_get_frequency_limits(struct dvb_frontend * fe,u32 * freq_min,u32 * freq_max,u32 * tolerance)896 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
897 u32 *freq_min, u32 *freq_max,
898 u32 *tolerance)
899 {
900 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
901 u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
902 u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
903 u32 frontend_min = fe->ops.info.frequency_min_hz;
904 u32 frontend_max = fe->ops.info.frequency_max_hz;
905
906 *freq_min = max(frontend_min, tuner_min);
907
908 if (frontend_max == 0)
909 *freq_max = tuner_max;
910 else if (tuner_max == 0)
911 *freq_max = frontend_max;
912 else
913 *freq_max = min(frontend_max, tuner_max);
914
915 if (*freq_min == 0 || *freq_max == 0)
916 dev_warn(fe->dvb->device,
917 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
918 fe->dvb->num, fe->id);
919
920 dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
921 tuner_min, tuner_max, frontend_min, frontend_max);
922
923 /* If the standard is for satellite, convert frequencies to kHz */
924 switch (c->delivery_system) {
925 case SYS_DVBS:
926 case SYS_DVBS2:
927 case SYS_TURBO:
928 case SYS_ISDBS:
929 *freq_min /= kHz;
930 *freq_max /= kHz;
931 if (tolerance)
932 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
933
934 break;
935 default:
936 if (tolerance)
937 *tolerance = fe->ops.info.frequency_tolerance_hz;
938 break;
939 }
940 }
941
dvb_frontend_get_stepsize(struct dvb_frontend * fe)942 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
943 {
944 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
945 u32 fe_step = fe->ops.info.frequency_stepsize_hz;
946 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
947 u32 step = max(fe_step, tuner_step);
948
949 switch (c->delivery_system) {
950 case SYS_DVBS:
951 case SYS_DVBS2:
952 case SYS_TURBO:
953 case SYS_ISDBS:
954 step /= kHz;
955 break;
956 default:
957 break;
958 }
959
960 return step;
961 }
962
dvb_frontend_check_parameters(struct dvb_frontend * fe)963 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
964 {
965 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
966 u32 freq_min;
967 u32 freq_max;
968
969 /* range check: frequency */
970 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
971 if ((freq_min && c->frequency < freq_min) ||
972 (freq_max && c->frequency > freq_max)) {
973 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
974 fe->dvb->num, fe->id, c->frequency,
975 freq_min, freq_max);
976 return -EINVAL;
977 }
978
979 /* range check: symbol rate */
980 switch (c->delivery_system) {
981 case SYS_DVBS:
982 case SYS_DVBS2:
983 case SYS_TURBO:
984 case SYS_DVBC_ANNEX_A:
985 case SYS_DVBC_ANNEX_C:
986 if ((fe->ops.info.symbol_rate_min &&
987 c->symbol_rate < fe->ops.info.symbol_rate_min) ||
988 (fe->ops.info.symbol_rate_max &&
989 c->symbol_rate > fe->ops.info.symbol_rate_max)) {
990 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
991 fe->dvb->num, fe->id, c->symbol_rate,
992 fe->ops.info.symbol_rate_min,
993 fe->ops.info.symbol_rate_max);
994 return -EINVAL;
995 }
996 default:
997 break;
998 }
999
1000 return 0;
1001 }
1002
dvb_frontend_clear_cache(struct dvb_frontend * fe)1003 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1004 {
1005 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1006 int i;
1007 u32 delsys;
1008
1009 delsys = c->delivery_system;
1010 memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1011 c->delivery_system = delsys;
1012
1013 dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1014 __func__, c->delivery_system);
1015
1016 c->transmission_mode = TRANSMISSION_MODE_AUTO;
1017 c->bandwidth_hz = 0; /* AUTO */
1018 c->guard_interval = GUARD_INTERVAL_AUTO;
1019 c->hierarchy = HIERARCHY_AUTO;
1020 c->symbol_rate = 0;
1021 c->code_rate_HP = FEC_AUTO;
1022 c->code_rate_LP = FEC_AUTO;
1023 c->fec_inner = FEC_AUTO;
1024 c->rolloff = ROLLOFF_AUTO;
1025 c->voltage = SEC_VOLTAGE_OFF;
1026 c->sectone = SEC_TONE_OFF;
1027 c->pilot = PILOT_AUTO;
1028
1029 c->isdbt_partial_reception = 0;
1030 c->isdbt_sb_mode = 0;
1031 c->isdbt_sb_subchannel = 0;
1032 c->isdbt_sb_segment_idx = 0;
1033 c->isdbt_sb_segment_count = 0;
1034 c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */
1035 for (i = 0; i < 3; i++) {
1036 c->layer[i].fec = FEC_AUTO;
1037 c->layer[i].modulation = QAM_AUTO;
1038 c->layer[i].interleaving = 0;
1039 c->layer[i].segment_count = 0;
1040 }
1041
1042 c->stream_id = NO_STREAM_ID_FILTER;
1043 c->scrambling_sequence_index = 0;/* default sequence */
1044
1045 switch (c->delivery_system) {
1046 case SYS_DVBS:
1047 case SYS_DVBS2:
1048 case SYS_TURBO:
1049 c->modulation = QPSK; /* implied for DVB-S in legacy API */
1050 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1051 break;
1052 case SYS_ATSC:
1053 c->modulation = VSB_8;
1054 break;
1055 case SYS_ISDBS:
1056 c->symbol_rate = 28860000;
1057 c->rolloff = ROLLOFF_35;
1058 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1059 break;
1060 default:
1061 c->modulation = QAM_AUTO;
1062 break;
1063 }
1064
1065 c->lna = LNA_AUTO;
1066
1067 return 0;
1068 }
1069
1070 #define _DTV_CMD(n, s, b) \
1071 [n] = { \
1072 .name = #n, \
1073 .cmd = n, \
1074 .set = s,\
1075 .buffer = b \
1076 }
1077
1078 struct dtv_cmds_h {
1079 char *name; /* A display name for debugging purposes */
1080
1081 __u32 cmd; /* A unique ID */
1082
1083 /* Flags */
1084 __u32 set:1; /* Either a set or get property */
1085 __u32 buffer:1; /* Does this property use the buffer? */
1086 __u32 reserved:30; /* Align */
1087 };
1088
1089 static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
1090 _DTV_CMD(DTV_TUNE, 1, 0),
1091 _DTV_CMD(DTV_CLEAR, 1, 0),
1092
1093 /* Set */
1094 _DTV_CMD(DTV_FREQUENCY, 1, 0),
1095 _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0),
1096 _DTV_CMD(DTV_MODULATION, 1, 0),
1097 _DTV_CMD(DTV_INVERSION, 1, 0),
1098 _DTV_CMD(DTV_DISEQC_MASTER, 1, 1),
1099 _DTV_CMD(DTV_SYMBOL_RATE, 1, 0),
1100 _DTV_CMD(DTV_INNER_FEC, 1, 0),
1101 _DTV_CMD(DTV_VOLTAGE, 1, 0),
1102 _DTV_CMD(DTV_TONE, 1, 0),
1103 _DTV_CMD(DTV_PILOT, 1, 0),
1104 _DTV_CMD(DTV_ROLLOFF, 1, 0),
1105 _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0),
1106 _DTV_CMD(DTV_HIERARCHY, 1, 0),
1107 _DTV_CMD(DTV_CODE_RATE_HP, 1, 0),
1108 _DTV_CMD(DTV_CODE_RATE_LP, 1, 0),
1109 _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0),
1110 _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0),
1111 _DTV_CMD(DTV_INTERLEAVING, 1, 0),
1112
1113 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0),
1114 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0),
1115 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0),
1116 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0),
1117 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0),
1118 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0),
1119 _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0),
1120 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0),
1121 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0),
1122 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0),
1123 _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0),
1124 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0),
1125 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0),
1126 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0),
1127 _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0),
1128 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0),
1129 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0),
1130 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0),
1131
1132 _DTV_CMD(DTV_STREAM_ID, 1, 0),
1133 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0),
1134 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0),
1135 _DTV_CMD(DTV_LNA, 1, 0),
1136
1137 /* Get */
1138 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1),
1139 _DTV_CMD(DTV_API_VERSION, 0, 0),
1140
1141 _DTV_CMD(DTV_ENUM_DELSYS, 0, 0),
1142
1143 _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0),
1144 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0),
1145
1146 _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0),
1147 _DTV_CMD(DTV_ATSCMH_NOG, 0, 0),
1148 _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0),
1149 _DTV_CMD(DTV_ATSCMH_SGN, 0, 0),
1150 _DTV_CMD(DTV_ATSCMH_PRC, 0, 0),
1151 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0),
1152 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0),
1153 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0),
1154 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0),
1155 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0),
1156 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
1157 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
1158 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
1159
1160 /* Statistics API */
1161 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
1162 _DTV_CMD(DTV_STAT_CNR, 0, 0),
1163 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
1164 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
1165 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
1166 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
1167 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
1168 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
1169 };
1170
1171 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1172 * drivers can use a single set_frontend tuning function, regardless of whether
1173 * it's being used for the legacy or new API, reducing code and complexity.
1174 */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1175 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1176 struct dtv_frontend_properties *c,
1177 const struct dvb_frontend_parameters *p)
1178 {
1179 c->frequency = p->frequency;
1180 c->inversion = p->inversion;
1181
1182 switch (dvbv3_type(c->delivery_system)) {
1183 case DVBV3_QPSK:
1184 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1185 c->symbol_rate = p->u.qpsk.symbol_rate;
1186 c->fec_inner = p->u.qpsk.fec_inner;
1187 break;
1188 case DVBV3_QAM:
1189 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1190 c->symbol_rate = p->u.qam.symbol_rate;
1191 c->fec_inner = p->u.qam.fec_inner;
1192 c->modulation = p->u.qam.modulation;
1193 break;
1194 case DVBV3_OFDM:
1195 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1196
1197 switch (p->u.ofdm.bandwidth) {
1198 case BANDWIDTH_10_MHZ:
1199 c->bandwidth_hz = 10000000;
1200 break;
1201 case BANDWIDTH_8_MHZ:
1202 c->bandwidth_hz = 8000000;
1203 break;
1204 case BANDWIDTH_7_MHZ:
1205 c->bandwidth_hz = 7000000;
1206 break;
1207 case BANDWIDTH_6_MHZ:
1208 c->bandwidth_hz = 6000000;
1209 break;
1210 case BANDWIDTH_5_MHZ:
1211 c->bandwidth_hz = 5000000;
1212 break;
1213 case BANDWIDTH_1_712_MHZ:
1214 c->bandwidth_hz = 1712000;
1215 break;
1216 case BANDWIDTH_AUTO:
1217 c->bandwidth_hz = 0;
1218 }
1219
1220 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1221 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1222 c->modulation = p->u.ofdm.constellation;
1223 c->transmission_mode = p->u.ofdm.transmission_mode;
1224 c->guard_interval = p->u.ofdm.guard_interval;
1225 c->hierarchy = p->u.ofdm.hierarchy_information;
1226 break;
1227 case DVBV3_ATSC:
1228 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1229 c->modulation = p->u.vsb.modulation;
1230 if (c->delivery_system == SYS_ATSCMH)
1231 break;
1232 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1233 c->delivery_system = SYS_ATSC;
1234 else
1235 c->delivery_system = SYS_DVBC_ANNEX_B;
1236 break;
1237 case DVBV3_UNKNOWN:
1238 dev_err(fe->dvb->device,
1239 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1240 __func__, c->delivery_system);
1241 return -EINVAL;
1242 }
1243
1244 return 0;
1245 }
1246
1247 /* Ensure the cached values are set correctly in the frontend
1248 * legacy tuning structures, for the advanced tuning API.
1249 */
1250 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1251 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1252 const struct dtv_frontend_properties *c,
1253 struct dvb_frontend_parameters *p)
1254 {
1255 p->frequency = c->frequency;
1256 p->inversion = c->inversion;
1257
1258 switch (dvbv3_type(c->delivery_system)) {
1259 case DVBV3_UNKNOWN:
1260 dev_err(fe->dvb->device,
1261 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1262 __func__, c->delivery_system);
1263 return -EINVAL;
1264 case DVBV3_QPSK:
1265 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1266 p->u.qpsk.symbol_rate = c->symbol_rate;
1267 p->u.qpsk.fec_inner = c->fec_inner;
1268 break;
1269 case DVBV3_QAM:
1270 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1271 p->u.qam.symbol_rate = c->symbol_rate;
1272 p->u.qam.fec_inner = c->fec_inner;
1273 p->u.qam.modulation = c->modulation;
1274 break;
1275 case DVBV3_OFDM:
1276 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1277 switch (c->bandwidth_hz) {
1278 case 10000000:
1279 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1280 break;
1281 case 8000000:
1282 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1283 break;
1284 case 7000000:
1285 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1286 break;
1287 case 6000000:
1288 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1289 break;
1290 case 5000000:
1291 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1292 break;
1293 case 1712000:
1294 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1295 break;
1296 case 0:
1297 default:
1298 p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1299 }
1300 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1301 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1302 p->u.ofdm.constellation = c->modulation;
1303 p->u.ofdm.transmission_mode = c->transmission_mode;
1304 p->u.ofdm.guard_interval = c->guard_interval;
1305 p->u.ofdm.hierarchy_information = c->hierarchy;
1306 break;
1307 case DVBV3_ATSC:
1308 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1309 p->u.vsb.modulation = c->modulation;
1310 break;
1311 }
1312 return 0;
1313 }
1314
1315 /**
1316 * dtv_get_frontend - calls a callback for retrieving DTV parameters
1317 * @fe: struct dvb_frontend pointer
1318 * @c: struct dtv_frontend_properties pointer (DVBv5 cache)
1319 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1320 *
1321 * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1322 * If c is not null, it will update the DVBv5 cache struct pointed by it.
1323 * If p_out is not null, it will update the DVBv3 params pointed by it.
1324 */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1325 static int dtv_get_frontend(struct dvb_frontend *fe,
1326 struct dtv_frontend_properties *c,
1327 struct dvb_frontend_parameters *p_out)
1328 {
1329 int r;
1330
1331 if (fe->ops.get_frontend) {
1332 r = fe->ops.get_frontend(fe, c);
1333 if (unlikely(r < 0))
1334 return r;
1335 if (p_out)
1336 dtv_property_legacy_params_sync(fe, c, p_out);
1337 return 0;
1338 }
1339
1340 /* As everything is in cache, get_frontend fops are always supported */
1341 return 0;
1342 }
1343
1344 static int dvb_frontend_handle_ioctl(struct file *file,
1345 unsigned int cmd, void *parg);
1346
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1347 static int dtv_property_process_get(struct dvb_frontend *fe,
1348 const struct dtv_frontend_properties *c,
1349 struct dtv_property *tvp,
1350 struct file *file)
1351 {
1352 int ncaps;
1353
1354 switch (tvp->cmd) {
1355 case DTV_ENUM_DELSYS:
1356 ncaps = 0;
1357 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1358 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1359 ncaps++;
1360 }
1361 tvp->u.buffer.len = ncaps;
1362 break;
1363 case DTV_FREQUENCY:
1364 tvp->u.data = c->frequency;
1365 break;
1366 case DTV_MODULATION:
1367 tvp->u.data = c->modulation;
1368 break;
1369 case DTV_BANDWIDTH_HZ:
1370 tvp->u.data = c->bandwidth_hz;
1371 break;
1372 case DTV_INVERSION:
1373 tvp->u.data = c->inversion;
1374 break;
1375 case DTV_SYMBOL_RATE:
1376 tvp->u.data = c->symbol_rate;
1377 break;
1378 case DTV_INNER_FEC:
1379 tvp->u.data = c->fec_inner;
1380 break;
1381 case DTV_PILOT:
1382 tvp->u.data = c->pilot;
1383 break;
1384 case DTV_ROLLOFF:
1385 tvp->u.data = c->rolloff;
1386 break;
1387 case DTV_DELIVERY_SYSTEM:
1388 tvp->u.data = c->delivery_system;
1389 break;
1390 case DTV_VOLTAGE:
1391 tvp->u.data = c->voltage;
1392 break;
1393 case DTV_TONE:
1394 tvp->u.data = c->sectone;
1395 break;
1396 case DTV_API_VERSION:
1397 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1398 break;
1399 case DTV_CODE_RATE_HP:
1400 tvp->u.data = c->code_rate_HP;
1401 break;
1402 case DTV_CODE_RATE_LP:
1403 tvp->u.data = c->code_rate_LP;
1404 break;
1405 case DTV_GUARD_INTERVAL:
1406 tvp->u.data = c->guard_interval;
1407 break;
1408 case DTV_TRANSMISSION_MODE:
1409 tvp->u.data = c->transmission_mode;
1410 break;
1411 case DTV_HIERARCHY:
1412 tvp->u.data = c->hierarchy;
1413 break;
1414 case DTV_INTERLEAVING:
1415 tvp->u.data = c->interleaving;
1416 break;
1417
1418 /* ISDB-T Support here */
1419 case DTV_ISDBT_PARTIAL_RECEPTION:
1420 tvp->u.data = c->isdbt_partial_reception;
1421 break;
1422 case DTV_ISDBT_SOUND_BROADCASTING:
1423 tvp->u.data = c->isdbt_sb_mode;
1424 break;
1425 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1426 tvp->u.data = c->isdbt_sb_subchannel;
1427 break;
1428 case DTV_ISDBT_SB_SEGMENT_IDX:
1429 tvp->u.data = c->isdbt_sb_segment_idx;
1430 break;
1431 case DTV_ISDBT_SB_SEGMENT_COUNT:
1432 tvp->u.data = c->isdbt_sb_segment_count;
1433 break;
1434 case DTV_ISDBT_LAYER_ENABLED:
1435 tvp->u.data = c->isdbt_layer_enabled;
1436 break;
1437 case DTV_ISDBT_LAYERA_FEC:
1438 tvp->u.data = c->layer[0].fec;
1439 break;
1440 case DTV_ISDBT_LAYERA_MODULATION:
1441 tvp->u.data = c->layer[0].modulation;
1442 break;
1443 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1444 tvp->u.data = c->layer[0].segment_count;
1445 break;
1446 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1447 tvp->u.data = c->layer[0].interleaving;
1448 break;
1449 case DTV_ISDBT_LAYERB_FEC:
1450 tvp->u.data = c->layer[1].fec;
1451 break;
1452 case DTV_ISDBT_LAYERB_MODULATION:
1453 tvp->u.data = c->layer[1].modulation;
1454 break;
1455 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1456 tvp->u.data = c->layer[1].segment_count;
1457 break;
1458 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1459 tvp->u.data = c->layer[1].interleaving;
1460 break;
1461 case DTV_ISDBT_LAYERC_FEC:
1462 tvp->u.data = c->layer[2].fec;
1463 break;
1464 case DTV_ISDBT_LAYERC_MODULATION:
1465 tvp->u.data = c->layer[2].modulation;
1466 break;
1467 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1468 tvp->u.data = c->layer[2].segment_count;
1469 break;
1470 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1471 tvp->u.data = c->layer[2].interleaving;
1472 break;
1473
1474 /* Multistream support */
1475 case DTV_STREAM_ID:
1476 case DTV_DVBT2_PLP_ID_LEGACY:
1477 tvp->u.data = c->stream_id;
1478 break;
1479
1480 /* Physical layer scrambling support */
1481 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1482 tvp->u.data = c->scrambling_sequence_index;
1483 break;
1484
1485 /* ATSC-MH */
1486 case DTV_ATSCMH_FIC_VER:
1487 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1488 break;
1489 case DTV_ATSCMH_PARADE_ID:
1490 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1491 break;
1492 case DTV_ATSCMH_NOG:
1493 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1494 break;
1495 case DTV_ATSCMH_TNOG:
1496 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1497 break;
1498 case DTV_ATSCMH_SGN:
1499 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1500 break;
1501 case DTV_ATSCMH_PRC:
1502 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1503 break;
1504 case DTV_ATSCMH_RS_FRAME_MODE:
1505 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1506 break;
1507 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1508 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1509 break;
1510 case DTV_ATSCMH_RS_CODE_MODE_PRI:
1511 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1512 break;
1513 case DTV_ATSCMH_RS_CODE_MODE_SEC:
1514 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1515 break;
1516 case DTV_ATSCMH_SCCC_BLOCK_MODE:
1517 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1518 break;
1519 case DTV_ATSCMH_SCCC_CODE_MODE_A:
1520 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1521 break;
1522 case DTV_ATSCMH_SCCC_CODE_MODE_B:
1523 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1524 break;
1525 case DTV_ATSCMH_SCCC_CODE_MODE_C:
1526 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1527 break;
1528 case DTV_ATSCMH_SCCC_CODE_MODE_D:
1529 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1530 break;
1531
1532 case DTV_LNA:
1533 tvp->u.data = c->lna;
1534 break;
1535
1536 /* Fill quality measures */
1537 case DTV_STAT_SIGNAL_STRENGTH:
1538 tvp->u.st = c->strength;
1539 break;
1540 case DTV_STAT_CNR:
1541 tvp->u.st = c->cnr;
1542 break;
1543 case DTV_STAT_PRE_ERROR_BIT_COUNT:
1544 tvp->u.st = c->pre_bit_error;
1545 break;
1546 case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1547 tvp->u.st = c->pre_bit_count;
1548 break;
1549 case DTV_STAT_POST_ERROR_BIT_COUNT:
1550 tvp->u.st = c->post_bit_error;
1551 break;
1552 case DTV_STAT_POST_TOTAL_BIT_COUNT:
1553 tvp->u.st = c->post_bit_count;
1554 break;
1555 case DTV_STAT_ERROR_BLOCK_COUNT:
1556 tvp->u.st = c->block_error;
1557 break;
1558 case DTV_STAT_TOTAL_BLOCK_COUNT:
1559 tvp->u.st = c->block_count;
1560 break;
1561 default:
1562 dev_dbg(fe->dvb->device,
1563 "%s: FE property %d doesn't exist\n",
1564 __func__, tvp->cmd);
1565 return -EINVAL;
1566 }
1567
1568 if (!dtv_cmds[tvp->cmd].buffer)
1569 dev_dbg(fe->dvb->device,
1570 "%s: GET cmd 0x%08x (%s) = 0x%08x\n",
1571 __func__, tvp->cmd, dtv_cmds[tvp->cmd].name,
1572 tvp->u.data);
1573 else
1574 dev_dbg(fe->dvb->device,
1575 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1576 __func__,
1577 tvp->cmd, dtv_cmds[tvp->cmd].name,
1578 tvp->u.buffer.len,
1579 tvp->u.buffer.len, tvp->u.buffer.data);
1580
1581 return 0;
1582 }
1583
1584 static int dtv_set_frontend(struct dvb_frontend *fe);
1585
is_dvbv3_delsys(u32 delsys)1586 static bool is_dvbv3_delsys(u32 delsys)
1587 {
1588 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1589 (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1590 }
1591
1592 /**
1593 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1594 * @fe: struct frontend;
1595 * @delsys: DVBv5 type that will be used for emulation
1596 *
1597 * Provides emulation for delivery systems that are compatible with the old
1598 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1599 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1600 * parameters are compatible with DVB-S spec.
1601 */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1602 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1603 {
1604 int i;
1605 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1606
1607 c->delivery_system = delsys;
1608
1609 /*
1610 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1611 */
1612 if (c->delivery_system == SYS_ISDBT) {
1613 dev_dbg(fe->dvb->device,
1614 "%s: Using defaults for SYS_ISDBT\n",
1615 __func__);
1616
1617 if (!c->bandwidth_hz)
1618 c->bandwidth_hz = 6000000;
1619
1620 c->isdbt_partial_reception = 0;
1621 c->isdbt_sb_mode = 0;
1622 c->isdbt_sb_subchannel = 0;
1623 c->isdbt_sb_segment_idx = 0;
1624 c->isdbt_sb_segment_count = 0;
1625 c->isdbt_layer_enabled = 7;
1626 for (i = 0; i < 3; i++) {
1627 c->layer[i].fec = FEC_AUTO;
1628 c->layer[i].modulation = QAM_AUTO;
1629 c->layer[i].interleaving = 0;
1630 c->layer[i].segment_count = 0;
1631 }
1632 }
1633 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1634 __func__, c->delivery_system);
1635
1636 return 0;
1637 }
1638
1639 /**
1640 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1641 * @fe: frontend struct
1642 * @desired_system: delivery system requested by the user
1643 *
1644 * A DVBv5 call know what's the desired system it wants. So, set it.
1645 *
1646 * There are, however, a few known issues with early DVBv5 applications that
1647 * are also handled by this logic:
1648 *
1649 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1650 * This is an API violation, but, as we don't want to break userspace,
1651 * convert it to the first supported delivery system.
1652 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1653 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1654 * ISDB-T provided backward compat with DVB-T.
1655 */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1656 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1657 u32 desired_system)
1658 {
1659 int ncaps;
1660 u32 delsys = SYS_UNDEFINED;
1661 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1662 enum dvbv3_emulation_type type;
1663
1664 /*
1665 * It was reported that some old DVBv5 applications were
1666 * filling delivery_system with SYS_UNDEFINED. If this happens,
1667 * assume that the application wants to use the first supported
1668 * delivery system.
1669 */
1670 if (desired_system == SYS_UNDEFINED)
1671 desired_system = fe->ops.delsys[0];
1672
1673 /*
1674 * This is a DVBv5 call. So, it likely knows the supported
1675 * delivery systems. So, check if the desired delivery system is
1676 * supported
1677 */
1678 ncaps = 0;
1679 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1680 if (fe->ops.delsys[ncaps] == desired_system) {
1681 c->delivery_system = desired_system;
1682 dev_dbg(fe->dvb->device,
1683 "%s: Changing delivery system to %d\n",
1684 __func__, desired_system);
1685 return 0;
1686 }
1687 ncaps++;
1688 }
1689
1690 /*
1691 * The requested delivery system isn't supported. Maybe userspace
1692 * is requesting a DVBv3 compatible delivery system.
1693 *
1694 * The emulation only works if the desired system is one of the
1695 * delivery systems supported by DVBv3 API
1696 */
1697 if (!is_dvbv3_delsys(desired_system)) {
1698 dev_dbg(fe->dvb->device,
1699 "%s: Delivery system %d not supported.\n",
1700 __func__, desired_system);
1701 return -EINVAL;
1702 }
1703
1704 type = dvbv3_type(desired_system);
1705
1706 /*
1707 * Get the last non-DVBv3 delivery system that has the same type
1708 * of the desired system
1709 */
1710 ncaps = 0;
1711 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1712 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1713 delsys = fe->ops.delsys[ncaps];
1714 ncaps++;
1715 }
1716
1717 /* There's nothing compatible with the desired delivery system */
1718 if (delsys == SYS_UNDEFINED) {
1719 dev_dbg(fe->dvb->device,
1720 "%s: Delivery system %d not supported on emulation mode.\n",
1721 __func__, desired_system);
1722 return -EINVAL;
1723 }
1724
1725 dev_dbg(fe->dvb->device,
1726 "%s: Using delivery system %d emulated as if it were %d\n",
1727 __func__, delsys, desired_system);
1728
1729 return emulate_delivery_system(fe, desired_system);
1730 }
1731
1732 /**
1733 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1734 * @fe: frontend struct
1735 *
1736 * A DVBv3 call doesn't know what's the desired system it wants. It also
1737 * doesn't allow to switch between different types. Due to that, userspace
1738 * should use DVBv5 instead.
1739 * However, in order to avoid breaking userspace API, limited backward
1740 * compatibility support is provided.
1741 *
1742 * There are some delivery systems that are incompatible with DVBv3 calls.
1743 *
1744 * This routine should work fine for frontends that support just one delivery
1745 * system.
1746 *
1747 * For frontends that support multiple frontends:
1748 * 1) It defaults to use the first supported delivery system. There's an
1749 * userspace application that allows changing it at runtime;
1750 *
1751 * 2) If the current delivery system is not compatible with DVBv3, it gets
1752 * the first one that it is compatible.
1753 *
1754 * NOTE: in order for this to work with applications like Kaffeine that
1755 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1756 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1757 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1758 * to DVB-S.
1759 */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1760 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1761 {
1762 int ncaps;
1763 u32 delsys = SYS_UNDEFINED;
1764 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1765
1766 /* If not set yet, defaults to the first supported delivery system */
1767 if (c->delivery_system == SYS_UNDEFINED)
1768 c->delivery_system = fe->ops.delsys[0];
1769
1770 /*
1771 * Trivial case: just use the current one, if it already a DVBv3
1772 * delivery system
1773 */
1774 if (is_dvbv3_delsys(c->delivery_system)) {
1775 dev_dbg(fe->dvb->device,
1776 "%s: Using delivery system to %d\n",
1777 __func__, c->delivery_system);
1778 return 0;
1779 }
1780
1781 /*
1782 * Seek for the first delivery system that it is compatible with a
1783 * DVBv3 standard
1784 */
1785 ncaps = 0;
1786 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1787 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1788 delsys = fe->ops.delsys[ncaps];
1789 break;
1790 }
1791 ncaps++;
1792 }
1793 if (delsys == SYS_UNDEFINED) {
1794 dev_dbg(fe->dvb->device,
1795 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1796 __func__);
1797 return -EINVAL;
1798 }
1799 return emulate_delivery_system(fe, delsys);
1800 }
1801
1802 /**
1803 * dtv_property_process_set - Sets a single DTV property
1804 * @fe: Pointer to &struct dvb_frontend
1805 * @file: Pointer to &struct file
1806 * @cmd: Digital TV command
1807 * @data: An unsigned 32-bits number
1808 *
1809 * This routine assigns the property
1810 * value to the corresponding member of
1811 * &struct dtv_frontend_properties
1812 *
1813 * Returns:
1814 * Zero on success, negative errno on failure.
1815 */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1816 static int dtv_property_process_set(struct dvb_frontend *fe,
1817 struct file *file,
1818 u32 cmd, u32 data)
1819 {
1820 int r = 0;
1821 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1822
1823 /** Dump DTV command name and value*/
1824 if (!cmd || cmd > DTV_MAX_COMMAND)
1825 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1826 __func__, cmd);
1827 else
1828 dev_dbg(fe->dvb->device,
1829 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1830 __func__, cmd, dtv_cmds[cmd].name, data);
1831 switch (cmd) {
1832 case DTV_CLEAR:
1833 /*
1834 * Reset a cache of data specific to the frontend here. This does
1835 * not effect hardware.
1836 */
1837 dvb_frontend_clear_cache(fe);
1838 break;
1839 case DTV_TUNE:
1840 /*
1841 * Use the cached Digital TV properties to tune the
1842 * frontend
1843 */
1844 dev_dbg(fe->dvb->device,
1845 "%s: Setting the frontend from property cache\n",
1846 __func__);
1847
1848 r = dtv_set_frontend(fe);
1849 break;
1850 case DTV_FREQUENCY:
1851 c->frequency = data;
1852 break;
1853 case DTV_MODULATION:
1854 c->modulation = data;
1855 break;
1856 case DTV_BANDWIDTH_HZ:
1857 c->bandwidth_hz = data;
1858 break;
1859 case DTV_INVERSION:
1860 c->inversion = data;
1861 break;
1862 case DTV_SYMBOL_RATE:
1863 c->symbol_rate = data;
1864 break;
1865 case DTV_INNER_FEC:
1866 c->fec_inner = data;
1867 break;
1868 case DTV_PILOT:
1869 c->pilot = data;
1870 break;
1871 case DTV_ROLLOFF:
1872 c->rolloff = data;
1873 break;
1874 case DTV_DELIVERY_SYSTEM:
1875 r = dvbv5_set_delivery_system(fe, data);
1876 break;
1877 case DTV_VOLTAGE:
1878 c->voltage = data;
1879 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1880 (void *)c->voltage);
1881 break;
1882 case DTV_TONE:
1883 c->sectone = data;
1884 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1885 (void *)c->sectone);
1886 break;
1887 case DTV_CODE_RATE_HP:
1888 c->code_rate_HP = data;
1889 break;
1890 case DTV_CODE_RATE_LP:
1891 c->code_rate_LP = data;
1892 break;
1893 case DTV_GUARD_INTERVAL:
1894 c->guard_interval = data;
1895 break;
1896 case DTV_TRANSMISSION_MODE:
1897 c->transmission_mode = data;
1898 break;
1899 case DTV_HIERARCHY:
1900 c->hierarchy = data;
1901 break;
1902 case DTV_INTERLEAVING:
1903 c->interleaving = data;
1904 break;
1905
1906 /* ISDB-T Support here */
1907 case DTV_ISDBT_PARTIAL_RECEPTION:
1908 c->isdbt_partial_reception = data;
1909 break;
1910 case DTV_ISDBT_SOUND_BROADCASTING:
1911 c->isdbt_sb_mode = data;
1912 break;
1913 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1914 c->isdbt_sb_subchannel = data;
1915 break;
1916 case DTV_ISDBT_SB_SEGMENT_IDX:
1917 c->isdbt_sb_segment_idx = data;
1918 break;
1919 case DTV_ISDBT_SB_SEGMENT_COUNT:
1920 c->isdbt_sb_segment_count = data;
1921 break;
1922 case DTV_ISDBT_LAYER_ENABLED:
1923 c->isdbt_layer_enabled = data;
1924 break;
1925 case DTV_ISDBT_LAYERA_FEC:
1926 c->layer[0].fec = data;
1927 break;
1928 case DTV_ISDBT_LAYERA_MODULATION:
1929 c->layer[0].modulation = data;
1930 break;
1931 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1932 c->layer[0].segment_count = data;
1933 break;
1934 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1935 c->layer[0].interleaving = data;
1936 break;
1937 case DTV_ISDBT_LAYERB_FEC:
1938 c->layer[1].fec = data;
1939 break;
1940 case DTV_ISDBT_LAYERB_MODULATION:
1941 c->layer[1].modulation = data;
1942 break;
1943 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1944 c->layer[1].segment_count = data;
1945 break;
1946 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1947 c->layer[1].interleaving = data;
1948 break;
1949 case DTV_ISDBT_LAYERC_FEC:
1950 c->layer[2].fec = data;
1951 break;
1952 case DTV_ISDBT_LAYERC_MODULATION:
1953 c->layer[2].modulation = data;
1954 break;
1955 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1956 c->layer[2].segment_count = data;
1957 break;
1958 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1959 c->layer[2].interleaving = data;
1960 break;
1961
1962 /* Multistream support */
1963 case DTV_STREAM_ID:
1964 case DTV_DVBT2_PLP_ID_LEGACY:
1965 c->stream_id = data;
1966 break;
1967
1968 /* Physical layer scrambling support */
1969 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1970 c->scrambling_sequence_index = data;
1971 break;
1972
1973 /* ATSC-MH */
1974 case DTV_ATSCMH_PARADE_ID:
1975 fe->dtv_property_cache.atscmh_parade_id = data;
1976 break;
1977 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1978 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
1979 break;
1980
1981 case DTV_LNA:
1982 c->lna = data;
1983 if (fe->ops.set_lna)
1984 r = fe->ops.set_lna(fe);
1985 if (r < 0)
1986 c->lna = LNA_AUTO;
1987 break;
1988
1989 default:
1990 return -EINVAL;
1991 }
1992
1993 return r;
1994 }
1995
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)1996 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
1997 void *parg)
1998 {
1999 struct dvb_device *dvbdev = file->private_data;
2000 struct dvb_frontend *fe = dvbdev->priv;
2001 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2002 int err;
2003
2004 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2005 if (down_interruptible(&fepriv->sem))
2006 return -ERESTARTSYS;
2007
2008 if (fe->exit != DVB_FE_NO_EXIT) {
2009 up(&fepriv->sem);
2010 return -ENODEV;
2011 }
2012
2013 /*
2014 * If the frontend is opened in read-only mode, only the ioctls
2015 * that don't interfere with the tune logic should be accepted.
2016 * That allows an external application to monitor the DVB QoS and
2017 * statistics parameters.
2018 *
2019 * That matches all _IOR() ioctls, except for two special cases:
2020 * - FE_GET_EVENT is part of the tuning logic on a DVB application;
2021 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2022 * setup
2023 * So, those two ioctls should also return -EPERM, as otherwise
2024 * reading from them would interfere with a DVB tune application
2025 */
2026 if ((file->f_flags & O_ACCMODE) == O_RDONLY
2027 && (_IOC_DIR(cmd) != _IOC_READ
2028 || cmd == FE_GET_EVENT
2029 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2030 up(&fepriv->sem);
2031 return -EPERM;
2032 }
2033
2034 err = dvb_frontend_handle_ioctl(file, cmd, parg);
2035
2036 up(&fepriv->sem);
2037 return err;
2038 }
2039
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2040 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2041 unsigned long arg)
2042 {
2043 struct dvb_device *dvbdev = file->private_data;
2044
2045 if (!dvbdev)
2046 return -ENODEV;
2047
2048 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2049 }
2050
2051 #ifdef CONFIG_COMPAT
2052 struct compat_dtv_property {
2053 __u32 cmd;
2054 __u32 reserved[3];
2055 union {
2056 __u32 data;
2057 struct dtv_fe_stats st;
2058 struct {
2059 __u8 data[32];
2060 __u32 len;
2061 __u32 reserved1[3];
2062 compat_uptr_t reserved2;
2063 } buffer;
2064 } u;
2065 int result;
2066 } __attribute__ ((packed));
2067
2068 struct compat_dtv_properties {
2069 __u32 num;
2070 compat_uptr_t props;
2071 };
2072
2073 #define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
2074 #define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
2075
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2076 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2077 unsigned long arg)
2078 {
2079 struct dvb_device *dvbdev = file->private_data;
2080 struct dvb_frontend *fe = dvbdev->priv;
2081 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2082 int i, err = 0;
2083
2084 if (cmd == COMPAT_FE_SET_PROPERTY) {
2085 struct compat_dtv_properties prop, *tvps = NULL;
2086 struct compat_dtv_property *tvp = NULL;
2087
2088 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2089 return -EFAULT;
2090
2091 tvps = ∝
2092
2093 /*
2094 * Put an arbitrary limit on the number of messages that can
2095 * be sent at once
2096 */
2097 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2098 return -EINVAL;
2099
2100 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2101 if (IS_ERR(tvp))
2102 return PTR_ERR(tvp);
2103
2104 for (i = 0; i < tvps->num; i++) {
2105 err = dtv_property_process_set(fe, file,
2106 (tvp + i)->cmd,
2107 (tvp + i)->u.data);
2108 if (err < 0) {
2109 kfree(tvp);
2110 return err;
2111 }
2112 }
2113 kfree(tvp);
2114 } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2115 struct compat_dtv_properties prop, *tvps = NULL;
2116 struct compat_dtv_property *tvp = NULL;
2117 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2118
2119 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2120 return -EFAULT;
2121
2122 tvps = ∝
2123
2124 /*
2125 * Put an arbitrary limit on the number of messages that can
2126 * be sent at once
2127 */
2128 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2129 return -EINVAL;
2130
2131 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2132 if (IS_ERR(tvp))
2133 return PTR_ERR(tvp);
2134
2135 /*
2136 * Let's use our own copy of property cache, in order to
2137 * avoid mangling with DTV zigzag logic, as drivers might
2138 * return crap, if they don't check if the data is available
2139 * before updating the properties cache.
2140 */
2141 if (fepriv->state != FESTATE_IDLE) {
2142 err = dtv_get_frontend(fe, &getp, NULL);
2143 if (err < 0) {
2144 kfree(tvp);
2145 return err;
2146 }
2147 }
2148 for (i = 0; i < tvps->num; i++) {
2149 err = dtv_property_process_get(
2150 fe, &getp, (struct dtv_property *)(tvp + i), file);
2151 if (err < 0) {
2152 kfree(tvp);
2153 return err;
2154 }
2155 }
2156
2157 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2158 tvps->num * sizeof(struct compat_dtv_property))) {
2159 kfree(tvp);
2160 return -EFAULT;
2161 }
2162 kfree(tvp);
2163 }
2164
2165 return err;
2166 }
2167
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2168 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2169 unsigned long arg)
2170 {
2171 struct dvb_device *dvbdev = file->private_data;
2172 struct dvb_frontend *fe = dvbdev->priv;
2173 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2174 int err;
2175
2176 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2177 if (down_interruptible(&fepriv->sem))
2178 return -ERESTARTSYS;
2179
2180 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2181
2182 up(&fepriv->sem);
2183 return err;
2184 }
2185
2186 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2187 }
2188 #endif
2189
dtv_set_frontend(struct dvb_frontend * fe)2190 static int dtv_set_frontend(struct dvb_frontend *fe)
2191 {
2192 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2193 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2194 struct dvb_frontend_tune_settings fetunesettings;
2195 u32 rolloff = 0;
2196
2197 if (dvb_frontend_check_parameters(fe) < 0)
2198 return -EINVAL;
2199
2200 /*
2201 * Initialize output parameters to match the values given by
2202 * the user. FE_SET_FRONTEND triggers an initial frontend event
2203 * with status = 0, which copies output parameters to userspace.
2204 */
2205 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2206
2207 /*
2208 * Be sure that the bandwidth will be filled for all
2209 * non-satellite systems, as tuners need to know what
2210 * low pass/Nyquist half filter should be applied, in
2211 * order to avoid inter-channel noise.
2212 *
2213 * ISDB-T and DVB-T/T2 already sets bandwidth.
2214 * ATSC and DVB-C don't set, so, the core should fill it.
2215 *
2216 * On DVB-C Annex A and C, the bandwidth is a function of
2217 * the roll-off and symbol rate. Annex B defines different
2218 * roll-off factors depending on the modulation. Fortunately,
2219 * Annex B is only used with 6MHz, so there's no need to
2220 * calculate it.
2221 *
2222 * While not officially supported, a side effect of handling it at
2223 * the cache level is that a program could retrieve the bandwidth
2224 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2225 */
2226 switch (c->delivery_system) {
2227 case SYS_ATSC:
2228 case SYS_DVBC_ANNEX_B:
2229 c->bandwidth_hz = 6000000;
2230 break;
2231 case SYS_DVBC_ANNEX_A:
2232 rolloff = 115;
2233 break;
2234 case SYS_DVBC_ANNEX_C:
2235 rolloff = 113;
2236 break;
2237 case SYS_DVBS:
2238 case SYS_TURBO:
2239 case SYS_ISDBS:
2240 rolloff = 135;
2241 break;
2242 case SYS_DVBS2:
2243 switch (c->rolloff) {
2244 case ROLLOFF_20:
2245 rolloff = 120;
2246 break;
2247 case ROLLOFF_25:
2248 rolloff = 125;
2249 break;
2250 default:
2251 case ROLLOFF_35:
2252 rolloff = 135;
2253 }
2254 break;
2255 default:
2256 break;
2257 }
2258 if (rolloff)
2259 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2260
2261 /* force auto frequency inversion if requested */
2262 if (dvb_force_auto_inversion)
2263 c->inversion = INVERSION_AUTO;
2264
2265 /*
2266 * without hierarchical coding code_rate_LP is irrelevant,
2267 * so we tolerate the otherwise invalid FEC_NONE setting
2268 */
2269 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2270 c->code_rate_LP = FEC_AUTO;
2271
2272 /* get frontend-specific tuning settings */
2273 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
2274 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
2275 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
2276 fepriv->max_drift = fetunesettings.max_drift;
2277 fepriv->step_size = fetunesettings.step_size;
2278 } else {
2279 /* default values */
2280 switch (c->delivery_system) {
2281 case SYS_DVBS:
2282 case SYS_DVBS2:
2283 case SYS_ISDBS:
2284 case SYS_TURBO:
2285 case SYS_DVBC_ANNEX_A:
2286 case SYS_DVBC_ANNEX_C:
2287 fepriv->min_delay = HZ / 20;
2288 fepriv->step_size = c->symbol_rate / 16000;
2289 fepriv->max_drift = c->symbol_rate / 2000;
2290 break;
2291 case SYS_DVBT:
2292 case SYS_DVBT2:
2293 case SYS_ISDBT:
2294 case SYS_DTMB:
2295 fepriv->min_delay = HZ / 20;
2296 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
2297 fepriv->max_drift = (dvb_frontend_get_stepsize(fe) * 2) + 1;
2298 break;
2299 default:
2300 /*
2301 * FIXME: This sounds wrong! if freqency_stepsize is
2302 * defined by the frontend, why not use it???
2303 */
2304 fepriv->min_delay = HZ / 20;
2305 fepriv->step_size = 0; /* no zigzag */
2306 fepriv->max_drift = 0;
2307 break;
2308 }
2309 }
2310 if (dvb_override_tune_delay > 0)
2311 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
2312
2313 fepriv->state = FESTATE_RETUNE;
2314
2315 /* Request the search algorithm to search */
2316 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2317
2318 dvb_frontend_clear_events(fe);
2319 dvb_frontend_add_event(fe, 0);
2320 dvb_frontend_wakeup(fe);
2321 fepriv->status = 0;
2322
2323 return 0;
2324 }
2325
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2326 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2327 struct dtv_properties *tvps)
2328 {
2329 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2330 struct dtv_property *tvp = NULL;
2331 struct dtv_frontend_properties getp;
2332 int i, err;
2333
2334 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2335
2336 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2337 __func__, tvps->num);
2338 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2339 __func__, tvps->props);
2340
2341 /*
2342 * Put an arbitrary limit on the number of messages that can
2343 * be sent at once
2344 */
2345 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2346 return -EINVAL;
2347
2348 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2349 if (IS_ERR(tvp))
2350 return PTR_ERR(tvp);
2351
2352 /*
2353 * Let's use our own copy of property cache, in order to
2354 * avoid mangling with DTV zigzag logic, as drivers might
2355 * return crap, if they don't check if the data is available
2356 * before updating the properties cache.
2357 */
2358 if (fepriv->state != FESTATE_IDLE) {
2359 err = dtv_get_frontend(fe, &getp, NULL);
2360 if (err < 0)
2361 goto out;
2362 }
2363 for (i = 0; i < tvps->num; i++) {
2364 err = dtv_property_process_get(fe, &getp,
2365 tvp + i, file);
2366 if (err < 0)
2367 goto out;
2368 }
2369
2370 if (copy_to_user((void __user *)tvps->props, tvp,
2371 tvps->num * sizeof(struct dtv_property))) {
2372 err = -EFAULT;
2373 goto out;
2374 }
2375
2376 err = 0;
2377 out:
2378 kfree(tvp);
2379 return err;
2380 }
2381
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2382 static int dvb_get_frontend(struct dvb_frontend *fe,
2383 struct dvb_frontend_parameters *p_out)
2384 {
2385 struct dtv_frontend_properties getp;
2386
2387 /*
2388 * Let's use our own copy of property cache, in order to
2389 * avoid mangling with DTV zigzag logic, as drivers might
2390 * return crap, if they don't check if the data is available
2391 * before updating the properties cache.
2392 */
2393 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2394
2395 return dtv_get_frontend(fe, &getp, p_out);
2396 }
2397
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2398 static int dvb_frontend_handle_ioctl(struct file *file,
2399 unsigned int cmd, void *parg)
2400 {
2401 struct dvb_device *dvbdev = file->private_data;
2402 struct dvb_frontend *fe = dvbdev->priv;
2403 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2404 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2405 int i, err = -ENOTSUPP;
2406
2407 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2408
2409 switch (cmd) {
2410 case FE_SET_PROPERTY: {
2411 struct dtv_properties *tvps = parg;
2412 struct dtv_property *tvp = NULL;
2413
2414 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2415 __func__, tvps->num);
2416 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2417 __func__, tvps->props);
2418
2419 /*
2420 * Put an arbitrary limit on the number of messages that can
2421 * be sent at once
2422 */
2423 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2424 return -EINVAL;
2425
2426 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2427 if (IS_ERR(tvp))
2428 return PTR_ERR(tvp);
2429
2430 for (i = 0; i < tvps->num; i++) {
2431 err = dtv_property_process_set(fe, file,
2432 (tvp + i)->cmd,
2433 (tvp + i)->u.data);
2434 if (err < 0) {
2435 kfree(tvp);
2436 return err;
2437 }
2438 }
2439 kfree(tvp);
2440 err = 0;
2441 break;
2442 }
2443 case FE_GET_PROPERTY:
2444 err = dvb_get_property(fe, file, parg);
2445 break;
2446
2447 case FE_GET_INFO: {
2448 struct dvb_frontend_info *info = parg;
2449 memset(info, 0, sizeof(*info));
2450
2451 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2452 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2453 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2454 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2455 info->caps = fe->ops.info.caps;
2456 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2457 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2458 &info->frequency_max,
2459 &info->frequency_tolerance);
2460
2461 /*
2462 * Associate the 4 delivery systems supported by DVBv3
2463 * API with their DVBv5 counterpart. For the other standards,
2464 * use the closest type, assuming that it would hopefully
2465 * work with a DVBv3 application.
2466 * It should be noticed that, on multi-frontend devices with
2467 * different types (terrestrial and cable, for example),
2468 * a pure DVBv3 application won't be able to use all delivery
2469 * systems. Yet, changing the DVBv5 cache to the other delivery
2470 * system should be enough for making it work.
2471 */
2472 switch (dvbv3_type(c->delivery_system)) {
2473 case DVBV3_QPSK:
2474 info->type = FE_QPSK;
2475 break;
2476 case DVBV3_ATSC:
2477 info->type = FE_ATSC;
2478 break;
2479 case DVBV3_QAM:
2480 info->type = FE_QAM;
2481 break;
2482 case DVBV3_OFDM:
2483 info->type = FE_OFDM;
2484 break;
2485 default:
2486 dev_err(fe->dvb->device,
2487 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2488 __func__, c->delivery_system);
2489 info->type = FE_OFDM;
2490 }
2491 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2492 __func__, c->delivery_system, info->type);
2493
2494 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2495 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2496 info->caps |= FE_CAN_INVERSION_AUTO;
2497 err = 0;
2498 break;
2499 }
2500
2501 case FE_READ_STATUS: {
2502 enum fe_status *status = parg;
2503
2504 /* if retune was requested but hasn't occurred yet, prevent
2505 * that user get signal state from previous tuning */
2506 if (fepriv->state == FESTATE_RETUNE ||
2507 fepriv->state == FESTATE_ERROR) {
2508 err = 0;
2509 *status = 0;
2510 break;
2511 }
2512
2513 if (fe->ops.read_status)
2514 err = fe->ops.read_status(fe, status);
2515 break;
2516 }
2517
2518 case FE_DISEQC_RESET_OVERLOAD:
2519 if (fe->ops.diseqc_reset_overload) {
2520 err = fe->ops.diseqc_reset_overload(fe);
2521 fepriv->state = FESTATE_DISEQC;
2522 fepriv->status = 0;
2523 }
2524 break;
2525
2526 case FE_DISEQC_SEND_MASTER_CMD:
2527 if (fe->ops.diseqc_send_master_cmd) {
2528 struct dvb_diseqc_master_cmd *cmd = parg;
2529
2530 if (cmd->msg_len > sizeof(cmd->msg)) {
2531 err = -EINVAL;
2532 break;
2533 }
2534 err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2535 fepriv->state = FESTATE_DISEQC;
2536 fepriv->status = 0;
2537 }
2538 break;
2539
2540 case FE_DISEQC_SEND_BURST:
2541 if (fe->ops.diseqc_send_burst) {
2542 err = fe->ops.diseqc_send_burst(fe,
2543 (enum fe_sec_mini_cmd)parg);
2544 fepriv->state = FESTATE_DISEQC;
2545 fepriv->status = 0;
2546 }
2547 break;
2548
2549 case FE_SET_TONE:
2550 if (fe->ops.set_tone) {
2551 err = fe->ops.set_tone(fe,
2552 (enum fe_sec_tone_mode)parg);
2553 fepriv->tone = (enum fe_sec_tone_mode)parg;
2554 fepriv->state = FESTATE_DISEQC;
2555 fepriv->status = 0;
2556 }
2557 break;
2558
2559 case FE_SET_VOLTAGE:
2560 if (fe->ops.set_voltage) {
2561 err = fe->ops.set_voltage(fe,
2562 (enum fe_sec_voltage)parg);
2563 fepriv->voltage = (enum fe_sec_voltage)parg;
2564 fepriv->state = FESTATE_DISEQC;
2565 fepriv->status = 0;
2566 }
2567 break;
2568
2569 case FE_DISEQC_RECV_SLAVE_REPLY:
2570 if (fe->ops.diseqc_recv_slave_reply)
2571 err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2572 break;
2573
2574 case FE_ENABLE_HIGH_LNB_VOLTAGE:
2575 if (fe->ops.enable_high_lnb_voltage)
2576 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2577 break;
2578
2579 case FE_SET_FRONTEND_TUNE_MODE:
2580 fepriv->tune_mode_flags = (unsigned long)parg;
2581 err = 0;
2582 break;
2583 /* DEPRECATED dish control ioctls */
2584
2585 case FE_DISHNETWORK_SEND_LEGACY_CMD:
2586 if (fe->ops.dishnetwork_send_legacy_command) {
2587 err = fe->ops.dishnetwork_send_legacy_command(fe,
2588 (unsigned long)parg);
2589 fepriv->state = FESTATE_DISEQC;
2590 fepriv->status = 0;
2591 } else if (fe->ops.set_voltage) {
2592 /*
2593 * NOTE: This is a fallback condition. Some frontends
2594 * (stv0299 for instance) take longer than 8msec to
2595 * respond to a set_voltage command. Those switches
2596 * need custom routines to switch properly. For all
2597 * other frontends, the following should work ok.
2598 * Dish network legacy switches (as used by Dish500)
2599 * are controlled by sending 9-bit command words
2600 * spaced 8msec apart.
2601 * the actual command word is switch/port dependent
2602 * so it is up to the userspace application to send
2603 * the right command.
2604 * The command must always start with a '0' after
2605 * initialization, so parg is 8 bits and does not
2606 * include the initialization or start bit
2607 */
2608 unsigned long swcmd = ((unsigned long)parg) << 1;
2609 ktime_t nexttime;
2610 ktime_t tv[10];
2611 int i;
2612 u8 last = 1;
2613
2614 if (dvb_frontend_debug)
2615 dprintk("switch command: 0x%04lx\n",
2616 swcmd);
2617 nexttime = ktime_get_boottime();
2618 if (dvb_frontend_debug)
2619 tv[0] = nexttime;
2620 /* before sending a command, initialize by sending
2621 * a 32ms 18V to the switch
2622 */
2623 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2624 dvb_frontend_sleep_until(&nexttime, 32000);
2625
2626 for (i = 0; i < 9; i++) {
2627 if (dvb_frontend_debug)
2628 tv[i + 1] = ktime_get_boottime();
2629 if ((swcmd & 0x01) != last) {
2630 /* set voltage to (last ? 13V : 18V) */
2631 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2632 last = (last) ? 0 : 1;
2633 }
2634 swcmd = swcmd >> 1;
2635 if (i != 8)
2636 dvb_frontend_sleep_until(&nexttime, 8000);
2637 }
2638 if (dvb_frontend_debug) {
2639 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2640 fe->dvb->num);
2641 for (i = 1; i < 10; i++)
2642 pr_info("%d: %d\n", i,
2643 (int)ktime_us_delta(tv[i], tv[i - 1]));
2644 }
2645 err = 0;
2646 fepriv->state = FESTATE_DISEQC;
2647 fepriv->status = 0;
2648 }
2649 break;
2650
2651 /* DEPRECATED statistics ioctls */
2652
2653 case FE_READ_BER:
2654 if (fe->ops.read_ber) {
2655 if (fepriv->thread)
2656 err = fe->ops.read_ber(fe, parg);
2657 else
2658 err = -EAGAIN;
2659 }
2660 break;
2661
2662 case FE_READ_SIGNAL_STRENGTH:
2663 if (fe->ops.read_signal_strength) {
2664 if (fepriv->thread)
2665 err = fe->ops.read_signal_strength(fe, parg);
2666 else
2667 err = -EAGAIN;
2668 }
2669 break;
2670
2671 case FE_READ_SNR:
2672 if (fe->ops.read_snr) {
2673 if (fepriv->thread)
2674 err = fe->ops.read_snr(fe, parg);
2675 else
2676 err = -EAGAIN;
2677 }
2678 break;
2679
2680 case FE_READ_UNCORRECTED_BLOCKS:
2681 if (fe->ops.read_ucblocks) {
2682 if (fepriv->thread)
2683 err = fe->ops.read_ucblocks(fe, parg);
2684 else
2685 err = -EAGAIN;
2686 }
2687 break;
2688
2689 /* DEPRECATED DVBv3 ioctls */
2690
2691 case FE_SET_FRONTEND:
2692 err = dvbv3_set_delivery_system(fe);
2693 if (err)
2694 break;
2695
2696 err = dtv_property_cache_sync(fe, c, parg);
2697 if (err)
2698 break;
2699 err = dtv_set_frontend(fe);
2700 break;
2701
2702 case FE_GET_EVENT:
2703 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2704 break;
2705
2706 case FE_GET_FRONTEND:
2707 err = dvb_get_frontend(fe, parg);
2708 break;
2709
2710 default:
2711 return -ENOTSUPP;
2712 } /* switch */
2713
2714 return err;
2715 }
2716
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2717 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2718 {
2719 struct dvb_device *dvbdev = file->private_data;
2720 struct dvb_frontend *fe = dvbdev->priv;
2721 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2722
2723 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2724
2725 poll_wait(file, &fepriv->events.wait_queue, wait);
2726
2727 if (fepriv->events.eventw != fepriv->events.eventr)
2728 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2729
2730 return 0;
2731 }
2732
dvb_frontend_open(struct inode * inode,struct file * file)2733 static int dvb_frontend_open(struct inode *inode, struct file *file)
2734 {
2735 struct dvb_device *dvbdev = file->private_data;
2736 struct dvb_frontend *fe = dvbdev->priv;
2737 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2738 struct dvb_adapter *adapter = fe->dvb;
2739 int ret;
2740
2741 mutex_lock(&fe->remove_mutex);
2742
2743 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2744 if (fe->exit == DVB_FE_DEVICE_REMOVED) {
2745 mutex_unlock(&fe->remove_mutex);
2746 return -ENODEV;
2747 }
2748
2749 if (adapter->mfe_shared) {
2750 mutex_lock(&adapter->mfe_lock);
2751
2752 if (!adapter->mfe_dvbdev)
2753 adapter->mfe_dvbdev = dvbdev;
2754
2755 else if (adapter->mfe_dvbdev != dvbdev) {
2756 struct dvb_device
2757 *mfedev = adapter->mfe_dvbdev;
2758 struct dvb_frontend
2759 *mfe = mfedev->priv;
2760 struct dvb_frontend_private
2761 *mfepriv = mfe->frontend_priv;
2762 int mferetry = (dvb_mfe_wait_time << 1);
2763
2764 mutex_unlock(&adapter->mfe_lock);
2765 while (mferetry-- && (mfedev->users != -1 ||
2766 mfepriv->thread)) {
2767 if (msleep_interruptible(500)) {
2768 if (signal_pending(current)) {
2769 mutex_unlock(&fe->remove_mutex);
2770 return -EINTR;
2771 }
2772 }
2773 }
2774
2775 mutex_lock(&adapter->mfe_lock);
2776 if (adapter->mfe_dvbdev != dvbdev) {
2777 mfedev = adapter->mfe_dvbdev;
2778 mfe = mfedev->priv;
2779 mfepriv = mfe->frontend_priv;
2780 if (mfedev->users != -1 ||
2781 mfepriv->thread) {
2782 mutex_unlock(&adapter->mfe_lock);
2783 mutex_unlock(&fe->remove_mutex);
2784 return -EBUSY;
2785 }
2786 adapter->mfe_dvbdev = dvbdev;
2787 }
2788 }
2789 }
2790
2791 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2792 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2793 goto err0;
2794
2795 /* If we took control of the bus, we need to force
2796 reinitialization. This is because many ts_bus_ctrl()
2797 functions strobe the RESET pin on the demod, and if the
2798 frontend thread already exists then the dvb_init() routine
2799 won't get called (which is what usually does initial
2800 register configuration). */
2801 fepriv->reinitialise = 1;
2802 }
2803
2804 if ((ret = dvb_generic_open(inode, file)) < 0)
2805 goto err1;
2806
2807 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2808 /* normal tune mode when opened R/W */
2809 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2810 fepriv->tone = -1;
2811 fepriv->voltage = -1;
2812
2813 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2814 mutex_lock(&fe->dvb->mdev_lock);
2815 if (fe->dvb->mdev) {
2816 mutex_lock(&fe->dvb->mdev->graph_mutex);
2817 if (fe->dvb->mdev->enable_source)
2818 ret = fe->dvb->mdev->enable_source(
2819 dvbdev->entity,
2820 &fepriv->pipe);
2821 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2822 if (ret) {
2823 mutex_unlock(&fe->dvb->mdev_lock);
2824 dev_err(fe->dvb->device,
2825 "Tuner is busy. Error %d\n", ret);
2826 goto err2;
2827 }
2828 }
2829 mutex_unlock(&fe->dvb->mdev_lock);
2830 #endif
2831 ret = dvb_frontend_start(fe);
2832 if (ret)
2833 goto err3;
2834
2835 /* empty event queue */
2836 fepriv->events.eventr = fepriv->events.eventw = 0;
2837 }
2838
2839 dvb_frontend_get(fe);
2840
2841 if (adapter->mfe_shared)
2842 mutex_unlock(&adapter->mfe_lock);
2843
2844 mutex_unlock(&fe->remove_mutex);
2845 return ret;
2846
2847 err3:
2848 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2849 mutex_lock(&fe->dvb->mdev_lock);
2850 if (fe->dvb->mdev) {
2851 mutex_lock(&fe->dvb->mdev->graph_mutex);
2852 if (fe->dvb->mdev->disable_source)
2853 fe->dvb->mdev->disable_source(dvbdev->entity);
2854 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2855 }
2856 mutex_unlock(&fe->dvb->mdev_lock);
2857 err2:
2858 #endif
2859 dvb_generic_release(inode, file);
2860 err1:
2861 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2862 fe->ops.ts_bus_ctrl(fe, 0);
2863 err0:
2864 if (adapter->mfe_shared)
2865 mutex_unlock(&adapter->mfe_lock);
2866
2867 mutex_unlock(&fe->remove_mutex);
2868 return ret;
2869 }
2870
dvb_frontend_release(struct inode * inode,struct file * file)2871 static int dvb_frontend_release(struct inode *inode, struct file *file)
2872 {
2873 struct dvb_device *dvbdev = file->private_data;
2874 struct dvb_frontend *fe = dvbdev->priv;
2875 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2876 int ret;
2877
2878 mutex_lock(&fe->remove_mutex);
2879
2880 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2881
2882 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2883 fepriv->release_jiffies = jiffies;
2884 mb();
2885 }
2886
2887 ret = dvb_generic_release(inode, file);
2888
2889 if (dvbdev->users == -1) {
2890 wake_up(&fepriv->wait_queue);
2891 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2892 mutex_lock(&fe->dvb->mdev_lock);
2893 if (fe->dvb->mdev) {
2894 mutex_lock(&fe->dvb->mdev->graph_mutex);
2895 if (fe->dvb->mdev->disable_source)
2896 fe->dvb->mdev->disable_source(dvbdev->entity);
2897 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2898 }
2899 mutex_unlock(&fe->dvb->mdev_lock);
2900 #endif
2901 if (fe->ops.ts_bus_ctrl)
2902 fe->ops.ts_bus_ctrl(fe, 0);
2903
2904 if (fe->exit != DVB_FE_NO_EXIT) {
2905 mutex_unlock(&fe->remove_mutex);
2906 wake_up(&dvbdev->wait_queue);
2907 } else
2908 mutex_unlock(&fe->remove_mutex);
2909
2910 } else
2911 mutex_unlock(&fe->remove_mutex);
2912
2913 dvb_frontend_put(fe);
2914
2915 return ret;
2916 }
2917
2918 static const struct file_operations dvb_frontend_fops = {
2919 .owner = THIS_MODULE,
2920 .unlocked_ioctl = dvb_frontend_ioctl,
2921 #ifdef CONFIG_COMPAT
2922 .compat_ioctl = dvb_frontend_compat_ioctl,
2923 #endif
2924 .poll = dvb_frontend_poll,
2925 .open = dvb_frontend_open,
2926 .release = dvb_frontend_release,
2927 .llseek = noop_llseek,
2928 };
2929
dvb_frontend_suspend(struct dvb_frontend * fe)2930 int dvb_frontend_suspend(struct dvb_frontend *fe)
2931 {
2932 int ret = 0;
2933
2934 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2935 fe->id);
2936
2937 if (fe->ops.tuner_ops.suspend)
2938 ret = fe->ops.tuner_ops.suspend(fe);
2939 else if (fe->ops.tuner_ops.sleep)
2940 ret = fe->ops.tuner_ops.sleep(fe);
2941
2942 if (fe->ops.sleep)
2943 ret = fe->ops.sleep(fe);
2944
2945 return ret;
2946 }
2947 EXPORT_SYMBOL(dvb_frontend_suspend);
2948
dvb_frontend_resume(struct dvb_frontend * fe)2949 int dvb_frontend_resume(struct dvb_frontend *fe)
2950 {
2951 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2952 int ret = 0;
2953
2954 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2955 fe->id);
2956
2957 fe->exit = DVB_FE_DEVICE_RESUME;
2958 if (fe->ops.init)
2959 ret = fe->ops.init(fe);
2960
2961 if (fe->ops.tuner_ops.resume)
2962 ret = fe->ops.tuner_ops.resume(fe);
2963 else if (fe->ops.tuner_ops.init)
2964 ret = fe->ops.tuner_ops.init(fe);
2965
2966 if (fe->ops.set_tone && fepriv->tone != -1)
2967 fe->ops.set_tone(fe, fepriv->tone);
2968 if (fe->ops.set_voltage && fepriv->voltage != -1)
2969 fe->ops.set_voltage(fe, fepriv->voltage);
2970
2971 fe->exit = DVB_FE_NO_EXIT;
2972 fepriv->state = FESTATE_RETUNE;
2973 dvb_frontend_wakeup(fe);
2974
2975 return ret;
2976 }
2977 EXPORT_SYMBOL(dvb_frontend_resume);
2978
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)2979 int dvb_register_frontend(struct dvb_adapter *dvb,
2980 struct dvb_frontend *fe)
2981 {
2982 struct dvb_frontend_private *fepriv;
2983 const struct dvb_device dvbdev_template = {
2984 .users = ~0,
2985 .writers = 1,
2986 .readers = (~0) - 1,
2987 .fops = &dvb_frontend_fops,
2988 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2989 .name = fe->ops.info.name,
2990 #endif
2991 };
2992
2993 dev_dbg(dvb->device, "%s:\n", __func__);
2994
2995 if (mutex_lock_interruptible(&frontend_mutex))
2996 return -ERESTARTSYS;
2997
2998 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2999 if (!fe->frontend_priv) {
3000 mutex_unlock(&frontend_mutex);
3001 return -ENOMEM;
3002 }
3003 fepriv = fe->frontend_priv;
3004
3005 kref_init(&fe->refcount);
3006 mutex_init(&fe->remove_mutex);
3007
3008 /*
3009 * After initialization, there need to be two references: one
3010 * for dvb_unregister_frontend(), and another one for
3011 * dvb_frontend_detach().
3012 */
3013 dvb_frontend_get(fe);
3014
3015 sema_init(&fepriv->sem, 1);
3016 init_waitqueue_head(&fepriv->wait_queue);
3017 init_waitqueue_head(&fepriv->events.wait_queue);
3018 mutex_init(&fepriv->events.mtx);
3019 fe->dvb = dvb;
3020 fepriv->inversion = INVERSION_OFF;
3021
3022 dev_info(fe->dvb->device,
3023 "DVB: registering adapter %i frontend %i (%s)...\n",
3024 fe->dvb->num, fe->id, fe->ops.info.name);
3025
3026 dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3027 fe, DVB_DEVICE_FRONTEND, 0);
3028
3029 /*
3030 * Initialize the cache to the proper values according with the
3031 * first supported delivery system (ops->delsys[0])
3032 */
3033
3034 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3035 dvb_frontend_clear_cache(fe);
3036
3037 mutex_unlock(&frontend_mutex);
3038 return 0;
3039 }
3040 EXPORT_SYMBOL(dvb_register_frontend);
3041
dvb_unregister_frontend(struct dvb_frontend * fe)3042 int dvb_unregister_frontend(struct dvb_frontend *fe)
3043 {
3044 struct dvb_frontend_private *fepriv = fe->frontend_priv;
3045
3046 dev_dbg(fe->dvb->device, "%s:\n", __func__);
3047
3048 mutex_lock(&frontend_mutex);
3049 dvb_frontend_stop(fe);
3050 dvb_remove_device(fepriv->dvbdev);
3051
3052 /* fe is invalid now */
3053 mutex_unlock(&frontend_mutex);
3054 dvb_frontend_put(fe);
3055 return 0;
3056 }
3057 EXPORT_SYMBOL(dvb_unregister_frontend);
3058
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3059 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3060 void (*release)(struct dvb_frontend *fe))
3061 {
3062 if (release) {
3063 release(fe);
3064 #ifdef CONFIG_MEDIA_ATTACH
3065 dvb_detach(release);
3066 #endif
3067 }
3068 }
3069
dvb_frontend_detach(struct dvb_frontend * fe)3070 void dvb_frontend_detach(struct dvb_frontend *fe)
3071 {
3072 dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3073 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3074 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3075 dvb_frontend_put(fe);
3076 }
3077 EXPORT_SYMBOL(dvb_frontend_detach);
3078