1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dvb_frontend.c: DVB frontend tuning interface/thread
4 *
5 * Copyright (C) 1999-2001 Ralph Metzler
6 * Marcus Metzler
7 * Holger Waechtler
8 * for convergence integrated media GmbH
9 *
10 * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11 */
12
13 /* Enables DVBv3 compatibility bits at the headers */
14 #define __DVB_CORE__
15
16 #define pr_fmt(fmt) "dvb_frontend: " fmt
17
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/wait.h>
22 #include <linux/slab.h>
23 #include <linux/poll.h>
24 #include <linux/semaphore.h>
25 #include <linux/module.h>
26 #include <linux/nospec.h>
27 #include <linux/list.h>
28 #include <linux/freezer.h>
29 #include <linux/jiffies.h>
30 #include <linux/kthread.h>
31 #include <linux/ktime.h>
32 #include <linux/compat.h>
33 #include <asm/processor.h>
34
35 #include <media/dvb_frontend.h>
36 #include <media/dvbdev.h>
37 #include <linux/dvb/version.h>
38
39 static int dvb_frontend_debug;
40 static int dvb_shutdown_timeout;
41 static int dvb_force_auto_inversion;
42 static int dvb_override_tune_delay;
43 static int dvb_powerdown_on_sleep = 1;
44 static int dvb_mfe_wait_time = 5;
45
46 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
47 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
48 module_param(dvb_shutdown_timeout, int, 0644);
49 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
50 module_param(dvb_force_auto_inversion, int, 0644);
51 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
52 module_param(dvb_override_tune_delay, int, 0644);
53 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
54 module_param(dvb_powerdown_on_sleep, int, 0644);
55 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
56 module_param(dvb_mfe_wait_time, int, 0644);
57 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
58
59 #define dprintk(fmt, arg...) \
60 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
61
62 #define FESTATE_IDLE 1
63 #define FESTATE_RETUNE 2
64 #define FESTATE_TUNING_FAST 4
65 #define FESTATE_TUNING_SLOW 8
66 #define FESTATE_TUNED 16
67 #define FESTATE_ZIGZAG_FAST 32
68 #define FESTATE_ZIGZAG_SLOW 64
69 #define FESTATE_DISEQC 128
70 #define FESTATE_ERROR 256
71 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
72 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
73 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
74 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
75
76 /*
77 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
78 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
79 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
80 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
81 * FESTATE_TUNED. The frontend has successfully locked on.
82 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
83 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
84 * FESTATE_DISEQC. A DISEQC command has just been issued.
85 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
86 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
87 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
88 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
89 */
90
91 static DEFINE_MUTEX(frontend_mutex);
92
93 struct dvb_frontend_private {
94 /* thread/frontend values */
95 struct dvb_device *dvbdev;
96 struct dvb_frontend_parameters parameters_out;
97 struct dvb_fe_events events;
98 struct semaphore sem;
99 struct list_head list_head;
100 wait_queue_head_t wait_queue;
101 struct task_struct *thread;
102 unsigned long release_jiffies;
103 unsigned int wakeup;
104 enum fe_status status;
105 unsigned long tune_mode_flags;
106 unsigned int delay;
107 unsigned int reinitialise;
108 int tone;
109 int voltage;
110
111 /* swzigzag values */
112 unsigned int state;
113 unsigned int bending;
114 int lnb_drift;
115 unsigned int inversion;
116 unsigned int auto_step;
117 unsigned int auto_sub_step;
118 unsigned int started_auto_step;
119 unsigned int min_delay;
120 unsigned int max_drift;
121 unsigned int step_size;
122 int quality;
123 unsigned int check_wrapped;
124 enum dvbfe_search algo_status;
125
126 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
127 struct media_pipeline pipe;
128 #endif
129 };
130
131 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
132 void (*release)(struct dvb_frontend *fe));
133
__dvb_frontend_free(struct dvb_frontend * fe)134 static void __dvb_frontend_free(struct dvb_frontend *fe)
135 {
136 struct dvb_frontend_private *fepriv = fe->frontend_priv;
137
138 if (fepriv)
139 dvb_device_put(fepriv->dvbdev);
140
141 dvb_frontend_invoke_release(fe, fe->ops.release);
142
143 kfree(fepriv);
144 }
145
dvb_frontend_free(struct kref * ref)146 static void dvb_frontend_free(struct kref *ref)
147 {
148 struct dvb_frontend *fe =
149 container_of(ref, struct dvb_frontend, refcount);
150
151 __dvb_frontend_free(fe);
152 }
153
dvb_frontend_put(struct dvb_frontend * fe)154 static void dvb_frontend_put(struct dvb_frontend *fe)
155 {
156 /* call detach before dropping the reference count */
157 if (fe->ops.detach)
158 fe->ops.detach(fe);
159 /*
160 * Check if the frontend was registered, as otherwise
161 * kref was not initialized yet.
162 */
163 if (fe->frontend_priv)
164 kref_put(&fe->refcount, dvb_frontend_free);
165 else
166 __dvb_frontend_free(fe);
167 }
168
dvb_frontend_get(struct dvb_frontend * fe)169 static void dvb_frontend_get(struct dvb_frontend *fe)
170 {
171 kref_get(&fe->refcount);
172 }
173
174 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
175 static int dtv_get_frontend(struct dvb_frontend *fe,
176 struct dtv_frontend_properties *c,
177 struct dvb_frontend_parameters *p_out);
178 static int
179 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
180 const struct dtv_frontend_properties *c,
181 struct dvb_frontend_parameters *p);
182
has_get_frontend(struct dvb_frontend * fe)183 static bool has_get_frontend(struct dvb_frontend *fe)
184 {
185 return fe->ops.get_frontend;
186 }
187
188 /*
189 * Due to DVBv3 API calls, a delivery system should be mapped into one of
190 * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
191 * otherwise, a DVBv3 call will fail.
192 */
193 enum dvbv3_emulation_type {
194 DVBV3_UNKNOWN,
195 DVBV3_QPSK,
196 DVBV3_QAM,
197 DVBV3_OFDM,
198 DVBV3_ATSC,
199 };
200
dvbv3_type(u32 delivery_system)201 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
202 {
203 switch (delivery_system) {
204 case SYS_DVBC_ANNEX_A:
205 case SYS_DVBC_ANNEX_C:
206 return DVBV3_QAM;
207 case SYS_DVBS:
208 case SYS_DVBS2:
209 case SYS_TURBO:
210 case SYS_ISDBS:
211 case SYS_DSS:
212 return DVBV3_QPSK;
213 case SYS_DVBT:
214 case SYS_DVBT2:
215 case SYS_ISDBT:
216 case SYS_DTMB:
217 return DVBV3_OFDM;
218 case SYS_ATSC:
219 case SYS_ATSCMH:
220 case SYS_DVBC_ANNEX_B:
221 return DVBV3_ATSC;
222 case SYS_UNDEFINED:
223 case SYS_ISDBC:
224 case SYS_DVBH:
225 case SYS_DAB:
226 default:
227 /*
228 * Doesn't know how to emulate those types and/or
229 * there's no frontend driver from this type yet
230 * with some emulation code, so, we're not sure yet how
231 * to handle them, or they're not compatible with a DVBv3 call.
232 */
233 return DVBV3_UNKNOWN;
234 }
235 }
236
dvb_frontend_add_event(struct dvb_frontend * fe,enum fe_status status)237 static void dvb_frontend_add_event(struct dvb_frontend *fe,
238 enum fe_status status)
239 {
240 struct dvb_frontend_private *fepriv = fe->frontend_priv;
241 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
242 struct dvb_fe_events *events = &fepriv->events;
243 struct dvb_frontend_event *e;
244 int wp;
245
246 dev_dbg(fe->dvb->device, "%s:\n", __func__);
247
248 if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
249 dtv_get_frontend(fe, c, &fepriv->parameters_out);
250
251 mutex_lock(&events->mtx);
252
253 wp = (events->eventw + 1) % MAX_EVENT;
254 if (wp == events->eventr) {
255 events->overflow = 1;
256 events->eventr = (events->eventr + 1) % MAX_EVENT;
257 }
258
259 e = &events->events[events->eventw];
260 e->status = status;
261 e->parameters = fepriv->parameters_out;
262
263 events->eventw = wp;
264
265 mutex_unlock(&events->mtx);
266
267 wake_up_interruptible(&events->wait_queue);
268 }
269
dvb_frontend_test_event(struct dvb_frontend_private * fepriv,struct dvb_fe_events * events)270 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
271 struct dvb_fe_events *events)
272 {
273 int ret;
274
275 up(&fepriv->sem);
276 ret = events->eventw != events->eventr;
277 down(&fepriv->sem);
278
279 return ret;
280 }
281
dvb_frontend_get_event(struct dvb_frontend * fe,struct dvb_frontend_event * event,int flags)282 static int dvb_frontend_get_event(struct dvb_frontend *fe,
283 struct dvb_frontend_event *event, int flags)
284 {
285 struct dvb_frontend_private *fepriv = fe->frontend_priv;
286 struct dvb_fe_events *events = &fepriv->events;
287
288 dev_dbg(fe->dvb->device, "%s:\n", __func__);
289
290 if (events->overflow) {
291 events->overflow = 0;
292 return -EOVERFLOW;
293 }
294
295 if (events->eventw == events->eventr) {
296 int ret;
297
298 if (flags & O_NONBLOCK)
299 return -EWOULDBLOCK;
300
301 ret = wait_event_interruptible(events->wait_queue,
302 dvb_frontend_test_event(fepriv, events));
303
304 if (ret < 0)
305 return ret;
306 }
307
308 mutex_lock(&events->mtx);
309 *event = events->events[events->eventr];
310 events->eventr = (events->eventr + 1) % MAX_EVENT;
311 mutex_unlock(&events->mtx);
312
313 return 0;
314 }
315
dvb_frontend_clear_events(struct dvb_frontend * fe)316 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
317 {
318 struct dvb_frontend_private *fepriv = fe->frontend_priv;
319 struct dvb_fe_events *events = &fepriv->events;
320
321 mutex_lock(&events->mtx);
322 events->eventr = events->eventw;
323 mutex_unlock(&events->mtx);
324 }
325
dvb_frontend_init(struct dvb_frontend * fe)326 static void dvb_frontend_init(struct dvb_frontend *fe)
327 {
328 dev_dbg(fe->dvb->device,
329 "%s: initialising adapter %i frontend %i (%s)...\n",
330 __func__, fe->dvb->num, fe->id, fe->ops.info.name);
331
332 if (fe->ops.init)
333 fe->ops.init(fe);
334 if (fe->ops.tuner_ops.init) {
335 if (fe->ops.i2c_gate_ctrl)
336 fe->ops.i2c_gate_ctrl(fe, 1);
337 fe->ops.tuner_ops.init(fe);
338 if (fe->ops.i2c_gate_ctrl)
339 fe->ops.i2c_gate_ctrl(fe, 0);
340 }
341 }
342
dvb_frontend_reinitialise(struct dvb_frontend * fe)343 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
344 {
345 struct dvb_frontend_private *fepriv = fe->frontend_priv;
346
347 fepriv->reinitialise = 1;
348 dvb_frontend_wakeup(fe);
349 }
350 EXPORT_SYMBOL(dvb_frontend_reinitialise);
351
dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private * fepriv,int locked)352 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
353 {
354 int q2;
355 struct dvb_frontend *fe = fepriv->dvbdev->priv;
356
357 dev_dbg(fe->dvb->device, "%s:\n", __func__);
358
359 if (locked)
360 (fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
361 else
362 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
363
364 q2 = fepriv->quality - 128;
365 q2 *= q2;
366
367 fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
368 }
369
370 /**
371 * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
372 * parameters.
373 *
374 * @fe: The frontend concerned.
375 * @check_wrapped: Checks if an iteration has completed.
376 * DO NOT SET ON THE FIRST ATTEMPT.
377 *
378 * return: Number of complete iterations that have been performed.
379 */
dvb_frontend_swzigzag_autotune(struct dvb_frontend * fe,int check_wrapped)380 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
381 {
382 int autoinversion;
383 int ready = 0;
384 int fe_set_err = 0;
385 struct dvb_frontend_private *fepriv = fe->frontend_priv;
386 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
387 int original_inversion = c->inversion;
388 u32 original_frequency = c->frequency;
389
390 /* are we using autoinversion? */
391 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
392 (c->inversion == INVERSION_AUTO));
393
394 /* setup parameters correctly */
395 while (!ready) {
396 /* calculate the lnb_drift */
397 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
398
399 /* wrap the auto_step if we've exceeded the maximum drift */
400 if (fepriv->lnb_drift > fepriv->max_drift) {
401 fepriv->auto_step = 0;
402 fepriv->auto_sub_step = 0;
403 fepriv->lnb_drift = 0;
404 }
405
406 /* perform inversion and +/- zigzag */
407 switch (fepriv->auto_sub_step) {
408 case 0:
409 /* try with the current inversion and current drift setting */
410 ready = 1;
411 break;
412
413 case 1:
414 if (!autoinversion) break;
415
416 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
417 ready = 1;
418 break;
419
420 case 2:
421 if (fepriv->lnb_drift == 0) break;
422
423 fepriv->lnb_drift = -fepriv->lnb_drift;
424 ready = 1;
425 break;
426
427 case 3:
428 if (fepriv->lnb_drift == 0) break;
429 if (!autoinversion) break;
430
431 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
432 fepriv->lnb_drift = -fepriv->lnb_drift;
433 ready = 1;
434 break;
435
436 default:
437 fepriv->auto_step++;
438 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
439 break;
440 }
441
442 if (!ready) fepriv->auto_sub_step++;
443 }
444
445 /* if this attempt would hit where we started, indicate a complete
446 * iteration has occurred */
447 if ((fepriv->auto_step == fepriv->started_auto_step) &&
448 (fepriv->auto_sub_step == 0) && check_wrapped) {
449 return 1;
450 }
451
452 dev_dbg(fe->dvb->device,
453 "%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
454 __func__, fepriv->lnb_drift, fepriv->inversion,
455 fepriv->auto_step, fepriv->auto_sub_step,
456 fepriv->started_auto_step);
457
458 /* set the frontend itself */
459 c->frequency += fepriv->lnb_drift;
460 if (autoinversion)
461 c->inversion = fepriv->inversion;
462 tmp = *c;
463 if (fe->ops.set_frontend)
464 fe_set_err = fe->ops.set_frontend(fe);
465 *c = tmp;
466 if (fe_set_err < 0) {
467 fepriv->state = FESTATE_ERROR;
468 return fe_set_err;
469 }
470
471 c->frequency = original_frequency;
472 c->inversion = original_inversion;
473
474 fepriv->auto_sub_step++;
475 return 0;
476 }
477
dvb_frontend_swzigzag(struct dvb_frontend * fe)478 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
479 {
480 enum fe_status s = FE_NONE;
481 int retval = 0;
482 struct dvb_frontend_private *fepriv = fe->frontend_priv;
483 struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
484
485 if (fepriv->max_drift)
486 dev_warn_once(fe->dvb->device,
487 "Frontend requested software zigzag, but didn't set the frequency step size\n");
488
489 /* if we've got no parameters, just keep idling */
490 if (fepriv->state & FESTATE_IDLE) {
491 fepriv->delay = 3 * HZ;
492 fepriv->quality = 0;
493 return;
494 }
495
496 /* in SCAN mode, we just set the frontend when asked and leave it alone */
497 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
498 if (fepriv->state & FESTATE_RETUNE) {
499 tmp = *c;
500 if (fe->ops.set_frontend)
501 retval = fe->ops.set_frontend(fe);
502 *c = tmp;
503 if (retval < 0)
504 fepriv->state = FESTATE_ERROR;
505 else
506 fepriv->state = FESTATE_TUNED;
507 }
508 fepriv->delay = 3 * HZ;
509 fepriv->quality = 0;
510 return;
511 }
512
513 /* get the frontend status */
514 if (fepriv->state & FESTATE_RETUNE) {
515 s = 0;
516 } else {
517 if (fe->ops.read_status)
518 fe->ops.read_status(fe, &s);
519 if (s != fepriv->status) {
520 dvb_frontend_add_event(fe, s);
521 fepriv->status = s;
522 }
523 }
524
525 /* if we're not tuned, and we have a lock, move to the TUNED state */
526 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
527 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
528 fepriv->state = FESTATE_TUNED;
529
530 /* if we're tuned, then we have determined the correct inversion */
531 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
532 (c->inversion == INVERSION_AUTO)) {
533 c->inversion = fepriv->inversion;
534 }
535 return;
536 }
537
538 /* if we are tuned already, check we're still locked */
539 if (fepriv->state & FESTATE_TUNED) {
540 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
541
542 /* we're tuned, and the lock is still good... */
543 if (s & FE_HAS_LOCK) {
544 return;
545 } else { /* if we _WERE_ tuned, but now don't have a lock */
546 fepriv->state = FESTATE_ZIGZAG_FAST;
547 fepriv->started_auto_step = fepriv->auto_step;
548 fepriv->check_wrapped = 0;
549 }
550 }
551
552 /* don't actually do anything if we're in the LOSTLOCK state,
553 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
554 if ((fepriv->state & FESTATE_LOSTLOCK) &&
555 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
556 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
557 return;
558 }
559
560 /* don't do anything if we're in the DISEQC state, since this
561 * might be someone with a motorized dish controlled by DISEQC.
562 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
563 if (fepriv->state & FESTATE_DISEQC) {
564 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
565 return;
566 }
567
568 /* if we're in the RETUNE state, set everything up for a brand
569 * new scan, keeping the current inversion setting, as the next
570 * tune is _very_ likely to require the same */
571 if (fepriv->state & FESTATE_RETUNE) {
572 fepriv->lnb_drift = 0;
573 fepriv->auto_step = 0;
574 fepriv->auto_sub_step = 0;
575 fepriv->started_auto_step = 0;
576 fepriv->check_wrapped = 0;
577 }
578
579 /* fast zigzag. */
580 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
581 fepriv->delay = fepriv->min_delay;
582
583 /* perform a tune */
584 retval = dvb_frontend_swzigzag_autotune(fe,
585 fepriv->check_wrapped);
586 if (retval < 0) {
587 return;
588 } else if (retval) {
589 /* OK, if we've run out of trials at the fast speed.
590 * Drop back to slow for the _next_ attempt */
591 fepriv->state = FESTATE_SEARCHING_SLOW;
592 fepriv->started_auto_step = fepriv->auto_step;
593 return;
594 }
595 fepriv->check_wrapped = 1;
596
597 /* if we've just re-tuned, enter the ZIGZAG_FAST state.
598 * This ensures we cannot return from an
599 * FE_SET_FRONTEND ioctl before the first frontend tune
600 * occurs */
601 if (fepriv->state & FESTATE_RETUNE) {
602 fepriv->state = FESTATE_TUNING_FAST;
603 }
604 }
605
606 /* slow zigzag */
607 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
608 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
609
610 /* Note: don't bother checking for wrapping; we stay in this
611 * state until we get a lock */
612 dvb_frontend_swzigzag_autotune(fe, 0);
613 }
614 }
615
dvb_frontend_is_exiting(struct dvb_frontend * fe)616 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
617 {
618 struct dvb_frontend_private *fepriv = fe->frontend_priv;
619
620 if (fe->exit != DVB_FE_NO_EXIT)
621 return 1;
622
623 if (fepriv->dvbdev->writers == 1)
624 if (time_after_eq(jiffies, fepriv->release_jiffies +
625 dvb_shutdown_timeout * HZ))
626 return 1;
627
628 return 0;
629 }
630
dvb_frontend_should_wakeup(struct dvb_frontend * fe)631 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
632 {
633 struct dvb_frontend_private *fepriv = fe->frontend_priv;
634
635 if (fepriv->wakeup) {
636 fepriv->wakeup = 0;
637 return 1;
638 }
639 return dvb_frontend_is_exiting(fe);
640 }
641
dvb_frontend_wakeup(struct dvb_frontend * fe)642 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
643 {
644 struct dvb_frontend_private *fepriv = fe->frontend_priv;
645
646 fepriv->wakeup = 1;
647 wake_up_interruptible(&fepriv->wait_queue);
648 }
649
dvb_frontend_thread(void * data)650 static int dvb_frontend_thread(void *data)
651 {
652 struct dvb_frontend *fe = data;
653 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
654 struct dvb_frontend_private *fepriv = fe->frontend_priv;
655 enum fe_status s = FE_NONE;
656 enum dvbfe_algo algo;
657 bool re_tune = false;
658 bool semheld = false;
659
660 dev_dbg(fe->dvb->device, "%s:\n", __func__);
661
662 fepriv->check_wrapped = 0;
663 fepriv->quality = 0;
664 fepriv->delay = 3 * HZ;
665 fepriv->status = 0;
666 fepriv->wakeup = 0;
667 fepriv->reinitialise = 0;
668
669 dvb_frontend_init(fe);
670
671 set_freezable();
672 while (1) {
673 up(&fepriv->sem); /* is locked when we enter the thread... */
674 restart:
675 wait_event_interruptible_timeout(fepriv->wait_queue,
676 dvb_frontend_should_wakeup(fe) ||
677 kthread_should_stop() ||
678 freezing(current),
679 fepriv->delay);
680
681 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
682 /* got signal or quitting */
683 if (!down_interruptible(&fepriv->sem))
684 semheld = true;
685 fe->exit = DVB_FE_NORMAL_EXIT;
686 break;
687 }
688
689 if (try_to_freeze())
690 goto restart;
691
692 if (down_interruptible(&fepriv->sem))
693 break;
694
695 if (fepriv->reinitialise) {
696 dvb_frontend_init(fe);
697 if (fe->ops.set_tone && fepriv->tone != -1)
698 fe->ops.set_tone(fe, fepriv->tone);
699 if (fe->ops.set_voltage && fepriv->voltage != -1)
700 fe->ops.set_voltage(fe, fepriv->voltage);
701 fepriv->reinitialise = 0;
702 }
703
704 /* do an iteration of the tuning loop */
705 if (fe->ops.get_frontend_algo) {
706 algo = fe->ops.get_frontend_algo(fe);
707 switch (algo) {
708 case DVBFE_ALGO_HW:
709 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
710
711 if (fepriv->state & FESTATE_RETUNE) {
712 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
713 re_tune = true;
714 fepriv->state = FESTATE_TUNED;
715 } else {
716 re_tune = false;
717 }
718
719 if (fe->ops.tune)
720 fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
721
722 if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
723 dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
724 dvb_frontend_add_event(fe, s);
725 fepriv->status = s;
726 }
727 break;
728 case DVBFE_ALGO_SW:
729 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
730 dvb_frontend_swzigzag(fe);
731 break;
732 case DVBFE_ALGO_CUSTOM:
733 dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
734 if (fepriv->state & FESTATE_RETUNE) {
735 dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
736 fepriv->state = FESTATE_TUNED;
737 }
738 /* Case where we are going to search for a carrier
739 * User asked us to retune again for some reason, possibly
740 * requesting a search with a new set of parameters
741 */
742 if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
743 if (fe->ops.search) {
744 fepriv->algo_status = fe->ops.search(fe);
745 /* We did do a search as was requested, the flags are
746 * now unset as well and has the flags wrt to search.
747 */
748 } else {
749 fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
750 }
751 }
752 /* Track the carrier if the search was successful */
753 if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
754 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
755 fepriv->delay = HZ / 2;
756 }
757 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
758 fe->ops.read_status(fe, &s);
759 if (s != fepriv->status) {
760 dvb_frontend_add_event(fe, s); /* update event list */
761 fepriv->status = s;
762 if (!(s & FE_HAS_LOCK)) {
763 fepriv->delay = HZ / 10;
764 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
765 } else {
766 fepriv->delay = 60 * HZ;
767 }
768 }
769 break;
770 default:
771 dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
772 break;
773 }
774 } else {
775 dvb_frontend_swzigzag(fe);
776 }
777 }
778
779 if (dvb_powerdown_on_sleep) {
780 if (fe->ops.set_voltage)
781 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
782 if (fe->ops.tuner_ops.sleep) {
783 if (fe->ops.i2c_gate_ctrl)
784 fe->ops.i2c_gate_ctrl(fe, 1);
785 fe->ops.tuner_ops.sleep(fe);
786 if (fe->ops.i2c_gate_ctrl)
787 fe->ops.i2c_gate_ctrl(fe, 0);
788 }
789 if (fe->ops.sleep)
790 fe->ops.sleep(fe);
791 }
792
793 fepriv->thread = NULL;
794 if (kthread_should_stop())
795 fe->exit = DVB_FE_DEVICE_REMOVED;
796 else
797 fe->exit = DVB_FE_NO_EXIT;
798 mb();
799
800 if (semheld)
801 up(&fepriv->sem);
802 dvb_frontend_wakeup(fe);
803 return 0;
804 }
805
dvb_frontend_stop(struct dvb_frontend * fe)806 static void dvb_frontend_stop(struct dvb_frontend *fe)
807 {
808 struct dvb_frontend_private *fepriv = fe->frontend_priv;
809
810 dev_dbg(fe->dvb->device, "%s:\n", __func__);
811
812 if (fe->exit != DVB_FE_DEVICE_REMOVED)
813 fe->exit = DVB_FE_NORMAL_EXIT;
814 mb();
815
816 if (!fepriv->thread)
817 return;
818
819 kthread_stop(fepriv->thread);
820
821 sema_init(&fepriv->sem, 1);
822 fepriv->state = FESTATE_IDLE;
823
824 /* paranoia check in case a signal arrived */
825 if (fepriv->thread)
826 dev_warn(fe->dvb->device,
827 "dvb_frontend_stop: warning: thread %p won't exit\n",
828 fepriv->thread);
829 }
830
831 /*
832 * Sleep for the amount of time given by add_usec parameter
833 *
834 * This needs to be as precise as possible, as it affects the detection of
835 * the dish tone command at the satellite subsystem. The precision is improved
836 * by using a scheduled msleep followed by udelay for the remainder.
837 */
dvb_frontend_sleep_until(ktime_t * waketime,u32 add_usec)838 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
839 {
840 s32 delta;
841
842 *waketime = ktime_add_us(*waketime, add_usec);
843 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
844 if (delta > 2500) {
845 msleep((delta - 1500) / 1000);
846 delta = ktime_us_delta(ktime_get_boottime(), *waketime);
847 }
848 if (delta > 0)
849 udelay(delta);
850 }
851 EXPORT_SYMBOL(dvb_frontend_sleep_until);
852
dvb_frontend_start(struct dvb_frontend * fe)853 static int dvb_frontend_start(struct dvb_frontend *fe)
854 {
855 int ret;
856 struct dvb_frontend_private *fepriv = fe->frontend_priv;
857 struct task_struct *fe_thread;
858
859 dev_dbg(fe->dvb->device, "%s:\n", __func__);
860
861 if (fepriv->thread) {
862 if (fe->exit == DVB_FE_NO_EXIT)
863 return 0;
864 else
865 dvb_frontend_stop(fe);
866 }
867
868 if (signal_pending(current))
869 return -EINTR;
870 if (down_interruptible(&fepriv->sem))
871 return -EINTR;
872
873 fepriv->state = FESTATE_IDLE;
874 fe->exit = DVB_FE_NO_EXIT;
875 fepriv->thread = NULL;
876 mb();
877
878 fe_thread = kthread_run(dvb_frontend_thread, fe,
879 "kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
880 if (IS_ERR(fe_thread)) {
881 ret = PTR_ERR(fe_thread);
882 dev_warn(fe->dvb->device,
883 "dvb_frontend_start: failed to start kthread (%d)\n",
884 ret);
885 up(&fepriv->sem);
886 return ret;
887 }
888 fepriv->thread = fe_thread;
889 return 0;
890 }
891
dvb_frontend_get_frequency_limits(struct dvb_frontend * fe,u32 * freq_min,u32 * freq_max,u32 * tolerance)892 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
893 u32 *freq_min, u32 *freq_max,
894 u32 *tolerance)
895 {
896 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
897 u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
898 u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
899 u32 frontend_min = fe->ops.info.frequency_min_hz;
900 u32 frontend_max = fe->ops.info.frequency_max_hz;
901
902 *freq_min = max(frontend_min, tuner_min);
903
904 if (frontend_max == 0)
905 *freq_max = tuner_max;
906 else if (tuner_max == 0)
907 *freq_max = frontend_max;
908 else
909 *freq_max = min(frontend_max, tuner_max);
910
911 if (*freq_min == 0 || *freq_max == 0)
912 dev_warn(fe->dvb->device,
913 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
914 fe->dvb->num, fe->id);
915
916 dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
917 tuner_min, tuner_max, frontend_min, frontend_max);
918
919 /* If the standard is for satellite, convert frequencies to kHz */
920 switch (c->delivery_system) {
921 case SYS_DSS:
922 case SYS_DVBS:
923 case SYS_DVBS2:
924 case SYS_TURBO:
925 case SYS_ISDBS:
926 *freq_min /= kHz;
927 *freq_max /= kHz;
928 if (tolerance)
929 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
930
931 break;
932 default:
933 if (tolerance)
934 *tolerance = fe->ops.info.frequency_tolerance_hz;
935 break;
936 }
937 }
938
dvb_frontend_get_stepsize(struct dvb_frontend * fe)939 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
940 {
941 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
942 u32 fe_step = fe->ops.info.frequency_stepsize_hz;
943 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
944 u32 step = max(fe_step, tuner_step);
945
946 switch (c->delivery_system) {
947 case SYS_DSS:
948 case SYS_DVBS:
949 case SYS_DVBS2:
950 case SYS_TURBO:
951 case SYS_ISDBS:
952 step /= kHz;
953 break;
954 default:
955 break;
956 }
957
958 return step;
959 }
960
dvb_frontend_check_parameters(struct dvb_frontend * fe)961 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
962 {
963 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
964 u32 freq_min;
965 u32 freq_max;
966
967 /* range check: frequency */
968 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
969 if ((freq_min && c->frequency < freq_min) ||
970 (freq_max && c->frequency > freq_max)) {
971 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
972 fe->dvb->num, fe->id, c->frequency,
973 freq_min, freq_max);
974 return -EINVAL;
975 }
976
977 /* range check: symbol rate */
978 switch (c->delivery_system) {
979 case SYS_DSS:
980 case SYS_DVBS:
981 case SYS_DVBS2:
982 case SYS_TURBO:
983 case SYS_DVBC_ANNEX_A:
984 case SYS_DVBC_ANNEX_C:
985 if ((fe->ops.info.symbol_rate_min &&
986 c->symbol_rate < fe->ops.info.symbol_rate_min) ||
987 (fe->ops.info.symbol_rate_max &&
988 c->symbol_rate > fe->ops.info.symbol_rate_max)) {
989 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
990 fe->dvb->num, fe->id, c->symbol_rate,
991 fe->ops.info.symbol_rate_min,
992 fe->ops.info.symbol_rate_max);
993 return -EINVAL;
994 }
995 break;
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_DSS:
1047 c->modulation = QPSK;
1048 c->rolloff = ROLLOFF_20;
1049 break;
1050 case SYS_DVBS:
1051 case SYS_DVBS2:
1052 case SYS_TURBO:
1053 c->modulation = QPSK; /* implied for DVB-S in legacy API */
1054 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1055 break;
1056 case SYS_ATSC:
1057 c->modulation = VSB_8;
1058 break;
1059 case SYS_ISDBS:
1060 c->symbol_rate = 28860000;
1061 c->rolloff = ROLLOFF_35;
1062 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1063 break;
1064 default:
1065 c->modulation = QAM_AUTO;
1066 break;
1067 }
1068
1069 c->lna = LNA_AUTO;
1070
1071 return 0;
1072 }
1073
1074 #define _DTV_CMD(n) \
1075 [n] = #n
1076
1077 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1078 _DTV_CMD(DTV_TUNE),
1079 _DTV_CMD(DTV_CLEAR),
1080
1081 /* Set */
1082 _DTV_CMD(DTV_FREQUENCY),
1083 _DTV_CMD(DTV_BANDWIDTH_HZ),
1084 _DTV_CMD(DTV_MODULATION),
1085 _DTV_CMD(DTV_INVERSION),
1086 _DTV_CMD(DTV_DISEQC_MASTER),
1087 _DTV_CMD(DTV_SYMBOL_RATE),
1088 _DTV_CMD(DTV_INNER_FEC),
1089 _DTV_CMD(DTV_VOLTAGE),
1090 _DTV_CMD(DTV_TONE),
1091 _DTV_CMD(DTV_PILOT),
1092 _DTV_CMD(DTV_ROLLOFF),
1093 _DTV_CMD(DTV_DELIVERY_SYSTEM),
1094 _DTV_CMD(DTV_HIERARCHY),
1095 _DTV_CMD(DTV_CODE_RATE_HP),
1096 _DTV_CMD(DTV_CODE_RATE_LP),
1097 _DTV_CMD(DTV_GUARD_INTERVAL),
1098 _DTV_CMD(DTV_TRANSMISSION_MODE),
1099 _DTV_CMD(DTV_INTERLEAVING),
1100
1101 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1102 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1103 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1104 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1105 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1106 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1107 _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1108 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1109 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1110 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1111 _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1112 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1113 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1114 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1115 _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1116 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1117 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1118 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1119
1120 _DTV_CMD(DTV_STREAM_ID),
1121 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1122 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1123 _DTV_CMD(DTV_LNA),
1124
1125 /* Get */
1126 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1127 _DTV_CMD(DTV_API_VERSION),
1128
1129 _DTV_CMD(DTV_ENUM_DELSYS),
1130
1131 _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1132 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1133
1134 _DTV_CMD(DTV_ATSCMH_FIC_VER),
1135 _DTV_CMD(DTV_ATSCMH_NOG),
1136 _DTV_CMD(DTV_ATSCMH_TNOG),
1137 _DTV_CMD(DTV_ATSCMH_SGN),
1138 _DTV_CMD(DTV_ATSCMH_PRC),
1139 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1140 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1141 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1142 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1143 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1144 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1145 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1146 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1147
1148 /* Statistics API */
1149 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1150 _DTV_CMD(DTV_STAT_CNR),
1151 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1152 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1153 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1154 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1155 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1156 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1157 };
1158
dtv_cmd_name(u32 cmd)1159 static char *dtv_cmd_name(u32 cmd)
1160 {
1161 cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1162 return dtv_cmds[cmd];
1163 }
1164
1165 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1166 * drivers can use a single set_frontend tuning function, regardless of whether
1167 * it's being used for the legacy or new API, reducing code and complexity.
1168 */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1169 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1170 struct dtv_frontend_properties *c,
1171 const struct dvb_frontend_parameters *p)
1172 {
1173 c->frequency = p->frequency;
1174 c->inversion = p->inversion;
1175
1176 switch (dvbv3_type(c->delivery_system)) {
1177 case DVBV3_QPSK:
1178 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1179 c->symbol_rate = p->u.qpsk.symbol_rate;
1180 c->fec_inner = p->u.qpsk.fec_inner;
1181 break;
1182 case DVBV3_QAM:
1183 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1184 c->symbol_rate = p->u.qam.symbol_rate;
1185 c->fec_inner = p->u.qam.fec_inner;
1186 c->modulation = p->u.qam.modulation;
1187 break;
1188 case DVBV3_OFDM:
1189 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1190
1191 switch (p->u.ofdm.bandwidth) {
1192 case BANDWIDTH_10_MHZ:
1193 c->bandwidth_hz = 10000000;
1194 break;
1195 case BANDWIDTH_8_MHZ:
1196 c->bandwidth_hz = 8000000;
1197 break;
1198 case BANDWIDTH_7_MHZ:
1199 c->bandwidth_hz = 7000000;
1200 break;
1201 case BANDWIDTH_6_MHZ:
1202 c->bandwidth_hz = 6000000;
1203 break;
1204 case BANDWIDTH_5_MHZ:
1205 c->bandwidth_hz = 5000000;
1206 break;
1207 case BANDWIDTH_1_712_MHZ:
1208 c->bandwidth_hz = 1712000;
1209 break;
1210 case BANDWIDTH_AUTO:
1211 c->bandwidth_hz = 0;
1212 }
1213
1214 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1215 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1216 c->modulation = p->u.ofdm.constellation;
1217 c->transmission_mode = p->u.ofdm.transmission_mode;
1218 c->guard_interval = p->u.ofdm.guard_interval;
1219 c->hierarchy = p->u.ofdm.hierarchy_information;
1220 break;
1221 case DVBV3_ATSC:
1222 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1223 c->modulation = p->u.vsb.modulation;
1224 if (c->delivery_system == SYS_ATSCMH)
1225 break;
1226 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1227 c->delivery_system = SYS_ATSC;
1228 else
1229 c->delivery_system = SYS_DVBC_ANNEX_B;
1230 break;
1231 case DVBV3_UNKNOWN:
1232 dev_err(fe->dvb->device,
1233 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1234 __func__, c->delivery_system);
1235 return -EINVAL;
1236 }
1237
1238 return 0;
1239 }
1240
1241 /* Ensure the cached values are set correctly in the frontend
1242 * legacy tuning structures, for the advanced tuning API.
1243 */
1244 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1245 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1246 const struct dtv_frontend_properties *c,
1247 struct dvb_frontend_parameters *p)
1248 {
1249 p->frequency = c->frequency;
1250 p->inversion = c->inversion;
1251
1252 switch (dvbv3_type(c->delivery_system)) {
1253 case DVBV3_UNKNOWN:
1254 dev_err(fe->dvb->device,
1255 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1256 __func__, c->delivery_system);
1257 return -EINVAL;
1258 case DVBV3_QPSK:
1259 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1260 p->u.qpsk.symbol_rate = c->symbol_rate;
1261 p->u.qpsk.fec_inner = c->fec_inner;
1262 break;
1263 case DVBV3_QAM:
1264 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1265 p->u.qam.symbol_rate = c->symbol_rate;
1266 p->u.qam.fec_inner = c->fec_inner;
1267 p->u.qam.modulation = c->modulation;
1268 break;
1269 case DVBV3_OFDM:
1270 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1271 switch (c->bandwidth_hz) {
1272 case 10000000:
1273 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1274 break;
1275 case 8000000:
1276 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1277 break;
1278 case 7000000:
1279 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1280 break;
1281 case 6000000:
1282 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1283 break;
1284 case 5000000:
1285 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1286 break;
1287 case 1712000:
1288 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1289 break;
1290 case 0:
1291 default:
1292 p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1293 }
1294 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1295 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1296 p->u.ofdm.constellation = c->modulation;
1297 p->u.ofdm.transmission_mode = c->transmission_mode;
1298 p->u.ofdm.guard_interval = c->guard_interval;
1299 p->u.ofdm.hierarchy_information = c->hierarchy;
1300 break;
1301 case DVBV3_ATSC:
1302 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1303 p->u.vsb.modulation = c->modulation;
1304 break;
1305 }
1306 return 0;
1307 }
1308
1309 /**
1310 * dtv_get_frontend - calls a callback for retrieving DTV parameters
1311 * @fe: struct dvb_frontend pointer
1312 * @c: struct dtv_frontend_properties pointer (DVBv5 cache)
1313 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1314 *
1315 * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1316 * If c is not null, it will update the DVBv5 cache struct pointed by it.
1317 * If p_out is not null, it will update the DVBv3 params pointed by it.
1318 */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1319 static int dtv_get_frontend(struct dvb_frontend *fe,
1320 struct dtv_frontend_properties *c,
1321 struct dvb_frontend_parameters *p_out)
1322 {
1323 int r;
1324
1325 if (fe->ops.get_frontend) {
1326 r = fe->ops.get_frontend(fe, c);
1327 if (unlikely(r < 0))
1328 return r;
1329 if (p_out)
1330 dtv_property_legacy_params_sync(fe, c, p_out);
1331 return 0;
1332 }
1333
1334 /* As everything is in cache, get_frontend fops are always supported */
1335 return 0;
1336 }
1337
1338 static int dvb_frontend_handle_ioctl(struct file *file,
1339 unsigned int cmd, void *parg);
1340
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1341 static int dtv_property_process_get(struct dvb_frontend *fe,
1342 const struct dtv_frontend_properties *c,
1343 struct dtv_property *tvp,
1344 struct file *file)
1345 {
1346 int ncaps;
1347 unsigned int len = 1;
1348
1349 switch (tvp->cmd) {
1350 case DTV_ENUM_DELSYS:
1351 ncaps = 0;
1352 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1353 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1354 ncaps++;
1355 }
1356 tvp->u.buffer.len = ncaps;
1357 len = ncaps;
1358 break;
1359 case DTV_FREQUENCY:
1360 tvp->u.data = c->frequency;
1361 break;
1362 case DTV_MODULATION:
1363 tvp->u.data = c->modulation;
1364 break;
1365 case DTV_BANDWIDTH_HZ:
1366 tvp->u.data = c->bandwidth_hz;
1367 break;
1368 case DTV_INVERSION:
1369 tvp->u.data = c->inversion;
1370 break;
1371 case DTV_SYMBOL_RATE:
1372 tvp->u.data = c->symbol_rate;
1373 break;
1374 case DTV_INNER_FEC:
1375 tvp->u.data = c->fec_inner;
1376 break;
1377 case DTV_PILOT:
1378 tvp->u.data = c->pilot;
1379 break;
1380 case DTV_ROLLOFF:
1381 tvp->u.data = c->rolloff;
1382 break;
1383 case DTV_DELIVERY_SYSTEM:
1384 tvp->u.data = c->delivery_system;
1385 break;
1386 case DTV_VOLTAGE:
1387 tvp->u.data = c->voltage;
1388 break;
1389 case DTV_TONE:
1390 tvp->u.data = c->sectone;
1391 break;
1392 case DTV_API_VERSION:
1393 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1394 break;
1395 case DTV_CODE_RATE_HP:
1396 tvp->u.data = c->code_rate_HP;
1397 break;
1398 case DTV_CODE_RATE_LP:
1399 tvp->u.data = c->code_rate_LP;
1400 break;
1401 case DTV_GUARD_INTERVAL:
1402 tvp->u.data = c->guard_interval;
1403 break;
1404 case DTV_TRANSMISSION_MODE:
1405 tvp->u.data = c->transmission_mode;
1406 break;
1407 case DTV_HIERARCHY:
1408 tvp->u.data = c->hierarchy;
1409 break;
1410 case DTV_INTERLEAVING:
1411 tvp->u.data = c->interleaving;
1412 break;
1413
1414 /* ISDB-T Support here */
1415 case DTV_ISDBT_PARTIAL_RECEPTION:
1416 tvp->u.data = c->isdbt_partial_reception;
1417 break;
1418 case DTV_ISDBT_SOUND_BROADCASTING:
1419 tvp->u.data = c->isdbt_sb_mode;
1420 break;
1421 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1422 tvp->u.data = c->isdbt_sb_subchannel;
1423 break;
1424 case DTV_ISDBT_SB_SEGMENT_IDX:
1425 tvp->u.data = c->isdbt_sb_segment_idx;
1426 break;
1427 case DTV_ISDBT_SB_SEGMENT_COUNT:
1428 tvp->u.data = c->isdbt_sb_segment_count;
1429 break;
1430 case DTV_ISDBT_LAYER_ENABLED:
1431 tvp->u.data = c->isdbt_layer_enabled;
1432 break;
1433 case DTV_ISDBT_LAYERA_FEC:
1434 tvp->u.data = c->layer[0].fec;
1435 break;
1436 case DTV_ISDBT_LAYERA_MODULATION:
1437 tvp->u.data = c->layer[0].modulation;
1438 break;
1439 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1440 tvp->u.data = c->layer[0].segment_count;
1441 break;
1442 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1443 tvp->u.data = c->layer[0].interleaving;
1444 break;
1445 case DTV_ISDBT_LAYERB_FEC:
1446 tvp->u.data = c->layer[1].fec;
1447 break;
1448 case DTV_ISDBT_LAYERB_MODULATION:
1449 tvp->u.data = c->layer[1].modulation;
1450 break;
1451 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1452 tvp->u.data = c->layer[1].segment_count;
1453 break;
1454 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1455 tvp->u.data = c->layer[1].interleaving;
1456 break;
1457 case DTV_ISDBT_LAYERC_FEC:
1458 tvp->u.data = c->layer[2].fec;
1459 break;
1460 case DTV_ISDBT_LAYERC_MODULATION:
1461 tvp->u.data = c->layer[2].modulation;
1462 break;
1463 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1464 tvp->u.data = c->layer[2].segment_count;
1465 break;
1466 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1467 tvp->u.data = c->layer[2].interleaving;
1468 break;
1469
1470 /* Multistream support */
1471 case DTV_STREAM_ID:
1472 case DTV_DVBT2_PLP_ID_LEGACY:
1473 tvp->u.data = c->stream_id;
1474 break;
1475
1476 /* Physical layer scrambling support */
1477 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1478 tvp->u.data = c->scrambling_sequence_index;
1479 break;
1480
1481 /* ATSC-MH */
1482 case DTV_ATSCMH_FIC_VER:
1483 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1484 break;
1485 case DTV_ATSCMH_PARADE_ID:
1486 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1487 break;
1488 case DTV_ATSCMH_NOG:
1489 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1490 break;
1491 case DTV_ATSCMH_TNOG:
1492 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1493 break;
1494 case DTV_ATSCMH_SGN:
1495 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1496 break;
1497 case DTV_ATSCMH_PRC:
1498 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1499 break;
1500 case DTV_ATSCMH_RS_FRAME_MODE:
1501 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1502 break;
1503 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1504 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1505 break;
1506 case DTV_ATSCMH_RS_CODE_MODE_PRI:
1507 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1508 break;
1509 case DTV_ATSCMH_RS_CODE_MODE_SEC:
1510 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1511 break;
1512 case DTV_ATSCMH_SCCC_BLOCK_MODE:
1513 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1514 break;
1515 case DTV_ATSCMH_SCCC_CODE_MODE_A:
1516 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1517 break;
1518 case DTV_ATSCMH_SCCC_CODE_MODE_B:
1519 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1520 break;
1521 case DTV_ATSCMH_SCCC_CODE_MODE_C:
1522 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1523 break;
1524 case DTV_ATSCMH_SCCC_CODE_MODE_D:
1525 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1526 break;
1527
1528 case DTV_LNA:
1529 tvp->u.data = c->lna;
1530 break;
1531
1532 /* Fill quality measures */
1533 case DTV_STAT_SIGNAL_STRENGTH:
1534 tvp->u.st = c->strength;
1535 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1536 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1537 len = tvp->u.buffer.len;
1538 break;
1539 case DTV_STAT_CNR:
1540 tvp->u.st = c->cnr;
1541 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1542 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1543 len = tvp->u.buffer.len;
1544 break;
1545 case DTV_STAT_PRE_ERROR_BIT_COUNT:
1546 tvp->u.st = c->pre_bit_error;
1547 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1548 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1549 len = tvp->u.buffer.len;
1550 break;
1551 case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1552 tvp->u.st = c->pre_bit_count;
1553 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1554 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1555 len = tvp->u.buffer.len;
1556 break;
1557 case DTV_STAT_POST_ERROR_BIT_COUNT:
1558 tvp->u.st = c->post_bit_error;
1559 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1560 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1561 len = tvp->u.buffer.len;
1562 break;
1563 case DTV_STAT_POST_TOTAL_BIT_COUNT:
1564 tvp->u.st = c->post_bit_count;
1565 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1566 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1567 len = tvp->u.buffer.len;
1568 break;
1569 case DTV_STAT_ERROR_BLOCK_COUNT:
1570 tvp->u.st = c->block_error;
1571 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1572 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1573 len = tvp->u.buffer.len;
1574 break;
1575 case DTV_STAT_TOTAL_BLOCK_COUNT:
1576 tvp->u.st = c->block_count;
1577 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1578 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1579 len = tvp->u.buffer.len;
1580 break;
1581 default:
1582 dev_dbg(fe->dvb->device,
1583 "%s: FE property %d doesn't exist\n",
1584 __func__, tvp->cmd);
1585 return -EINVAL;
1586 }
1587
1588 if (len < 1)
1589 len = 1;
1590
1591 dev_dbg(fe->dvb->device,
1592 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1593 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1594 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1595
1596 return 0;
1597 }
1598
1599 static int dtv_set_frontend(struct dvb_frontend *fe);
1600
is_dvbv3_delsys(u32 delsys)1601 static bool is_dvbv3_delsys(u32 delsys)
1602 {
1603 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1604 (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1605 }
1606
1607 /**
1608 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1609 * @fe: struct frontend;
1610 * @delsys: DVBv5 type that will be used for emulation
1611 *
1612 * Provides emulation for delivery systems that are compatible with the old
1613 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1614 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1615 * parameters are compatible with DVB-S spec.
1616 */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1617 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1618 {
1619 int i;
1620 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1621
1622 c->delivery_system = delsys;
1623
1624 /*
1625 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1626 */
1627 if (c->delivery_system == SYS_ISDBT) {
1628 dev_dbg(fe->dvb->device,
1629 "%s: Using defaults for SYS_ISDBT\n",
1630 __func__);
1631
1632 if (!c->bandwidth_hz)
1633 c->bandwidth_hz = 6000000;
1634
1635 c->isdbt_partial_reception = 0;
1636 c->isdbt_sb_mode = 0;
1637 c->isdbt_sb_subchannel = 0;
1638 c->isdbt_sb_segment_idx = 0;
1639 c->isdbt_sb_segment_count = 0;
1640 c->isdbt_layer_enabled = 7;
1641 for (i = 0; i < 3; i++) {
1642 c->layer[i].fec = FEC_AUTO;
1643 c->layer[i].modulation = QAM_AUTO;
1644 c->layer[i].interleaving = 0;
1645 c->layer[i].segment_count = 0;
1646 }
1647 }
1648 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1649 __func__, c->delivery_system);
1650
1651 return 0;
1652 }
1653
1654 /**
1655 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1656 * @fe: frontend struct
1657 * @desired_system: delivery system requested by the user
1658 *
1659 * A DVBv5 call know what's the desired system it wants. So, set it.
1660 *
1661 * There are, however, a few known issues with early DVBv5 applications that
1662 * are also handled by this logic:
1663 *
1664 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1665 * This is an API violation, but, as we don't want to break userspace,
1666 * convert it to the first supported delivery system.
1667 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1668 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1669 * ISDB-T provided backward compat with DVB-T.
1670 */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1671 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1672 u32 desired_system)
1673 {
1674 int ncaps;
1675 u32 delsys = SYS_UNDEFINED;
1676 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1677 enum dvbv3_emulation_type type;
1678
1679 /*
1680 * It was reported that some old DVBv5 applications were
1681 * filling delivery_system with SYS_UNDEFINED. If this happens,
1682 * assume that the application wants to use the first supported
1683 * delivery system.
1684 */
1685 if (desired_system == SYS_UNDEFINED)
1686 desired_system = fe->ops.delsys[0];
1687
1688 /*
1689 * This is a DVBv5 call. So, it likely knows the supported
1690 * delivery systems. So, check if the desired delivery system is
1691 * supported
1692 */
1693 ncaps = 0;
1694 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1695 if (fe->ops.delsys[ncaps] == desired_system) {
1696 c->delivery_system = desired_system;
1697 dev_dbg(fe->dvb->device,
1698 "%s: Changing delivery system to %d\n",
1699 __func__, desired_system);
1700 return 0;
1701 }
1702 ncaps++;
1703 }
1704
1705 /*
1706 * The requested delivery system isn't supported. Maybe userspace
1707 * is requesting a DVBv3 compatible delivery system.
1708 *
1709 * The emulation only works if the desired system is one of the
1710 * delivery systems supported by DVBv3 API
1711 */
1712 if (!is_dvbv3_delsys(desired_system)) {
1713 dev_dbg(fe->dvb->device,
1714 "%s: Delivery system %d not supported.\n",
1715 __func__, desired_system);
1716 return -EINVAL;
1717 }
1718
1719 type = dvbv3_type(desired_system);
1720
1721 /*
1722 * Get the last non-DVBv3 delivery system that has the same type
1723 * of the desired system
1724 */
1725 ncaps = 0;
1726 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1727 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1728 delsys = fe->ops.delsys[ncaps];
1729 ncaps++;
1730 }
1731
1732 /* There's nothing compatible with the desired delivery system */
1733 if (delsys == SYS_UNDEFINED) {
1734 dev_dbg(fe->dvb->device,
1735 "%s: Delivery system %d not supported on emulation mode.\n",
1736 __func__, desired_system);
1737 return -EINVAL;
1738 }
1739
1740 dev_dbg(fe->dvb->device,
1741 "%s: Using delivery system %d emulated as if it were %d\n",
1742 __func__, delsys, desired_system);
1743
1744 return emulate_delivery_system(fe, desired_system);
1745 }
1746
1747 /**
1748 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1749 * @fe: frontend struct
1750 *
1751 * A DVBv3 call doesn't know what's the desired system it wants. It also
1752 * doesn't allow to switch between different types. Due to that, userspace
1753 * should use DVBv5 instead.
1754 * However, in order to avoid breaking userspace API, limited backward
1755 * compatibility support is provided.
1756 *
1757 * There are some delivery systems that are incompatible with DVBv3 calls.
1758 *
1759 * This routine should work fine for frontends that support just one delivery
1760 * system.
1761 *
1762 * For frontends that support multiple frontends:
1763 * 1) It defaults to use the first supported delivery system. There's an
1764 * userspace application that allows changing it at runtime;
1765 *
1766 * 2) If the current delivery system is not compatible with DVBv3, it gets
1767 * the first one that it is compatible.
1768 *
1769 * NOTE: in order for this to work with applications like Kaffeine that
1770 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1771 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1772 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1773 * to DVB-S.
1774 */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1775 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1776 {
1777 int ncaps;
1778 u32 delsys = SYS_UNDEFINED;
1779 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1780
1781 /* If not set yet, defaults to the first supported delivery system */
1782 if (c->delivery_system == SYS_UNDEFINED)
1783 c->delivery_system = fe->ops.delsys[0];
1784
1785 /*
1786 * Trivial case: just use the current one, if it already a DVBv3
1787 * delivery system
1788 */
1789 if (is_dvbv3_delsys(c->delivery_system)) {
1790 dev_dbg(fe->dvb->device,
1791 "%s: Using delivery system to %d\n",
1792 __func__, c->delivery_system);
1793 return 0;
1794 }
1795
1796 /*
1797 * Seek for the first delivery system that it is compatible with a
1798 * DVBv3 standard
1799 */
1800 ncaps = 0;
1801 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1802 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1803 delsys = fe->ops.delsys[ncaps];
1804 break;
1805 }
1806 ncaps++;
1807 }
1808 if (delsys == SYS_UNDEFINED) {
1809 dev_dbg(fe->dvb->device,
1810 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1811 __func__);
1812 return -EINVAL;
1813 }
1814 return emulate_delivery_system(fe, delsys);
1815 }
1816
prepare_tuning_algo_parameters(struct dvb_frontend * fe)1817 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1818 {
1819 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1820 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1821 struct dvb_frontend_tune_settings fetunesettings = { 0 };
1822
1823 /* get frontend-specific tuning settings */
1824 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1825 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1826 fepriv->max_drift = fetunesettings.max_drift;
1827 fepriv->step_size = fetunesettings.step_size;
1828 } else {
1829 /* default values */
1830 switch (c->delivery_system) {
1831 case SYS_DSS:
1832 case SYS_DVBS:
1833 case SYS_DVBS2:
1834 case SYS_ISDBS:
1835 case SYS_TURBO:
1836 case SYS_DVBC_ANNEX_A:
1837 case SYS_DVBC_ANNEX_C:
1838 fepriv->min_delay = HZ / 20;
1839 fepriv->step_size = c->symbol_rate / 16000;
1840 fepriv->max_drift = c->symbol_rate / 2000;
1841 break;
1842 case SYS_DVBT:
1843 case SYS_DVBT2:
1844 case SYS_ISDBT:
1845 case SYS_DTMB:
1846 fepriv->min_delay = HZ / 20;
1847 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1848 fepriv->max_drift = fepriv->step_size + 1;
1849 break;
1850 default:
1851 /*
1852 * FIXME: This sounds wrong! if freqency_stepsize is
1853 * defined by the frontend, why not use it???
1854 */
1855 fepriv->min_delay = HZ / 20;
1856 fepriv->step_size = 0; /* no zigzag */
1857 fepriv->max_drift = 0;
1858 break;
1859 }
1860 }
1861 if (dvb_override_tune_delay > 0)
1862 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1863 }
1864
1865 /**
1866 * dtv_property_process_set - Sets a single DTV property
1867 * @fe: Pointer to &struct dvb_frontend
1868 * @file: Pointer to &struct file
1869 * @cmd: Digital TV command
1870 * @data: An unsigned 32-bits number
1871 *
1872 * This routine assigns the property
1873 * value to the corresponding member of
1874 * &struct dtv_frontend_properties
1875 *
1876 * Returns:
1877 * Zero on success, negative errno on failure.
1878 */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1879 static int dtv_property_process_set(struct dvb_frontend *fe,
1880 struct file *file,
1881 u32 cmd, u32 data)
1882 {
1883 int r = 0;
1884 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1885
1886 /** Dump DTV command name and value*/
1887 if (!cmd || cmd > DTV_MAX_COMMAND)
1888 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1889 __func__, cmd);
1890 else
1891 dev_dbg(fe->dvb->device,
1892 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1893 __func__, cmd, dtv_cmd_name(cmd), data);
1894 switch (cmd) {
1895 case DTV_CLEAR:
1896 /*
1897 * Reset a cache of data specific to the frontend here. This does
1898 * not effect hardware.
1899 */
1900 dvb_frontend_clear_cache(fe);
1901 break;
1902 case DTV_TUNE:
1903 /*
1904 * Use the cached Digital TV properties to tune the
1905 * frontend
1906 */
1907 dev_dbg(fe->dvb->device,
1908 "%s: Setting the frontend from property cache\n",
1909 __func__);
1910
1911 r = dtv_set_frontend(fe);
1912 break;
1913 case DTV_FREQUENCY:
1914 c->frequency = data;
1915 break;
1916 case DTV_MODULATION:
1917 c->modulation = data;
1918 break;
1919 case DTV_BANDWIDTH_HZ:
1920 c->bandwidth_hz = data;
1921 break;
1922 case DTV_INVERSION:
1923 c->inversion = data;
1924 break;
1925 case DTV_SYMBOL_RATE:
1926 c->symbol_rate = data;
1927 break;
1928 case DTV_INNER_FEC:
1929 c->fec_inner = data;
1930 break;
1931 case DTV_PILOT:
1932 c->pilot = data;
1933 break;
1934 case DTV_ROLLOFF:
1935 c->rolloff = data;
1936 break;
1937 case DTV_DELIVERY_SYSTEM:
1938 r = dvbv5_set_delivery_system(fe, data);
1939 break;
1940 case DTV_VOLTAGE:
1941 c->voltage = data;
1942 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1943 (void *)c->voltage);
1944 break;
1945 case DTV_TONE:
1946 c->sectone = data;
1947 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1948 (void *)c->sectone);
1949 break;
1950 case DTV_CODE_RATE_HP:
1951 c->code_rate_HP = data;
1952 break;
1953 case DTV_CODE_RATE_LP:
1954 c->code_rate_LP = data;
1955 break;
1956 case DTV_GUARD_INTERVAL:
1957 c->guard_interval = data;
1958 break;
1959 case DTV_TRANSMISSION_MODE:
1960 c->transmission_mode = data;
1961 break;
1962 case DTV_HIERARCHY:
1963 c->hierarchy = data;
1964 break;
1965 case DTV_INTERLEAVING:
1966 c->interleaving = data;
1967 break;
1968
1969 /* ISDB-T Support here */
1970 case DTV_ISDBT_PARTIAL_RECEPTION:
1971 c->isdbt_partial_reception = data;
1972 break;
1973 case DTV_ISDBT_SOUND_BROADCASTING:
1974 c->isdbt_sb_mode = data;
1975 break;
1976 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1977 c->isdbt_sb_subchannel = data;
1978 break;
1979 case DTV_ISDBT_SB_SEGMENT_IDX:
1980 c->isdbt_sb_segment_idx = data;
1981 break;
1982 case DTV_ISDBT_SB_SEGMENT_COUNT:
1983 c->isdbt_sb_segment_count = data;
1984 break;
1985 case DTV_ISDBT_LAYER_ENABLED:
1986 c->isdbt_layer_enabled = data;
1987 break;
1988 case DTV_ISDBT_LAYERA_FEC:
1989 c->layer[0].fec = data;
1990 break;
1991 case DTV_ISDBT_LAYERA_MODULATION:
1992 c->layer[0].modulation = data;
1993 break;
1994 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1995 c->layer[0].segment_count = data;
1996 break;
1997 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1998 c->layer[0].interleaving = data;
1999 break;
2000 case DTV_ISDBT_LAYERB_FEC:
2001 c->layer[1].fec = data;
2002 break;
2003 case DTV_ISDBT_LAYERB_MODULATION:
2004 c->layer[1].modulation = data;
2005 break;
2006 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2007 c->layer[1].segment_count = data;
2008 break;
2009 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2010 c->layer[1].interleaving = data;
2011 break;
2012 case DTV_ISDBT_LAYERC_FEC:
2013 c->layer[2].fec = data;
2014 break;
2015 case DTV_ISDBT_LAYERC_MODULATION:
2016 c->layer[2].modulation = data;
2017 break;
2018 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2019 c->layer[2].segment_count = data;
2020 break;
2021 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2022 c->layer[2].interleaving = data;
2023 break;
2024
2025 /* Multistream support */
2026 case DTV_STREAM_ID:
2027 case DTV_DVBT2_PLP_ID_LEGACY:
2028 c->stream_id = data;
2029 break;
2030
2031 /* Physical layer scrambling support */
2032 case DTV_SCRAMBLING_SEQUENCE_INDEX:
2033 c->scrambling_sequence_index = data;
2034 break;
2035
2036 /* ATSC-MH */
2037 case DTV_ATSCMH_PARADE_ID:
2038 fe->dtv_property_cache.atscmh_parade_id = data;
2039 break;
2040 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2041 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2042 break;
2043
2044 case DTV_LNA:
2045 c->lna = data;
2046 if (fe->ops.set_lna)
2047 r = fe->ops.set_lna(fe);
2048 if (r < 0)
2049 c->lna = LNA_AUTO;
2050 break;
2051
2052 default:
2053 return -EINVAL;
2054 }
2055
2056 return r;
2057 }
2058
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)2059 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2060 void *parg)
2061 {
2062 struct dvb_device *dvbdev = file->private_data;
2063 struct dvb_frontend *fe = dvbdev->priv;
2064 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2065 int err;
2066
2067 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2068 if (down_interruptible(&fepriv->sem))
2069 return -ERESTARTSYS;
2070
2071 if (fe->exit != DVB_FE_NO_EXIT) {
2072 up(&fepriv->sem);
2073 return -ENODEV;
2074 }
2075
2076 /*
2077 * If the frontend is opened in read-only mode, only the ioctls
2078 * that don't interfere with the tune logic should be accepted.
2079 * That allows an external application to monitor the DVB QoS and
2080 * statistics parameters.
2081 *
2082 * That matches all _IOR() ioctls, except for two special cases:
2083 * - FE_GET_EVENT is part of the tuning logic on a DVB application;
2084 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2085 * setup
2086 * So, those two ioctls should also return -EPERM, as otherwise
2087 * reading from them would interfere with a DVB tune application
2088 */
2089 if ((file->f_flags & O_ACCMODE) == O_RDONLY
2090 && (_IOC_DIR(cmd) != _IOC_READ
2091 || cmd == FE_GET_EVENT
2092 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2093 up(&fepriv->sem);
2094 return -EPERM;
2095 }
2096
2097 err = dvb_frontend_handle_ioctl(file, cmd, parg);
2098
2099 up(&fepriv->sem);
2100 return err;
2101 }
2102
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2103 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2104 unsigned long arg)
2105 {
2106 struct dvb_device *dvbdev = file->private_data;
2107
2108 if (!dvbdev)
2109 return -ENODEV;
2110
2111 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2112 }
2113
2114 #ifdef CONFIG_COMPAT
2115 struct compat_dtv_property {
2116 __u32 cmd;
2117 __u32 reserved[3];
2118 union {
2119 __u32 data;
2120 struct dtv_fe_stats st;
2121 struct {
2122 __u8 data[32];
2123 __u32 len;
2124 __u32 reserved1[3];
2125 compat_uptr_t reserved2;
2126 } buffer;
2127 } u;
2128 int result;
2129 } __attribute__ ((packed));
2130
2131 struct compat_dtv_properties {
2132 __u32 num;
2133 compat_uptr_t props;
2134 };
2135
2136 #define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
2137 #define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
2138
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2139 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2140 unsigned long arg)
2141 {
2142 struct dvb_device *dvbdev = file->private_data;
2143 struct dvb_frontend *fe = dvbdev->priv;
2144 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2145 int i, err = 0;
2146
2147 if (cmd == COMPAT_FE_SET_PROPERTY) {
2148 struct compat_dtv_properties prop, *tvps = NULL;
2149 struct compat_dtv_property *tvp = NULL;
2150
2151 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2152 return -EFAULT;
2153
2154 tvps = ∝
2155
2156 /*
2157 * Put an arbitrary limit on the number of messages that can
2158 * be sent at once
2159 */
2160 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2161 return -EINVAL;
2162
2163 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2164 if (IS_ERR(tvp))
2165 return PTR_ERR(tvp);
2166
2167 for (i = 0; i < tvps->num; i++) {
2168 err = dtv_property_process_set(fe, file,
2169 (tvp + i)->cmd,
2170 (tvp + i)->u.data);
2171 if (err < 0) {
2172 kfree(tvp);
2173 return err;
2174 }
2175 }
2176 kfree(tvp);
2177 } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2178 struct compat_dtv_properties prop, *tvps = NULL;
2179 struct compat_dtv_property *tvp = NULL;
2180 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2181
2182 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2183 return -EFAULT;
2184
2185 tvps = ∝
2186
2187 /*
2188 * Put an arbitrary limit on the number of messages that can
2189 * be sent at once
2190 */
2191 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2192 return -EINVAL;
2193
2194 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2195 if (IS_ERR(tvp))
2196 return PTR_ERR(tvp);
2197
2198 /*
2199 * Let's use our own copy of property cache, in order to
2200 * avoid mangling with DTV zigzag logic, as drivers might
2201 * return crap, if they don't check if the data is available
2202 * before updating the properties cache.
2203 */
2204 if (fepriv->state != FESTATE_IDLE) {
2205 err = dtv_get_frontend(fe, &getp, NULL);
2206 if (err < 0) {
2207 kfree(tvp);
2208 return err;
2209 }
2210 }
2211 for (i = 0; i < tvps->num; i++) {
2212 err = dtv_property_process_get(
2213 fe, &getp, (struct dtv_property *)(tvp + i), file);
2214 if (err < 0) {
2215 kfree(tvp);
2216 return err;
2217 }
2218 }
2219
2220 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2221 tvps->num * sizeof(struct compat_dtv_property))) {
2222 kfree(tvp);
2223 return -EFAULT;
2224 }
2225 kfree(tvp);
2226 }
2227
2228 return err;
2229 }
2230
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2231 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2232 unsigned long arg)
2233 {
2234 struct dvb_device *dvbdev = file->private_data;
2235 struct dvb_frontend *fe = dvbdev->priv;
2236 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2237 int err;
2238
2239 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2240 if (down_interruptible(&fepriv->sem))
2241 return -ERESTARTSYS;
2242
2243 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2244
2245 up(&fepriv->sem);
2246 return err;
2247 }
2248
2249 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2250 }
2251 #endif
2252
dtv_set_frontend(struct dvb_frontend * fe)2253 static int dtv_set_frontend(struct dvb_frontend *fe)
2254 {
2255 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2256 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2257 u32 rolloff = 0;
2258
2259 if (dvb_frontend_check_parameters(fe) < 0)
2260 return -EINVAL;
2261
2262 /*
2263 * Initialize output parameters to match the values given by
2264 * the user. FE_SET_FRONTEND triggers an initial frontend event
2265 * with status = 0, which copies output parameters to userspace.
2266 */
2267 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2268
2269 /*
2270 * Be sure that the bandwidth will be filled for all
2271 * non-satellite systems, as tuners need to know what
2272 * low pass/Nyquist half filter should be applied, in
2273 * order to avoid inter-channel noise.
2274 *
2275 * ISDB-T and DVB-T/T2 already sets bandwidth.
2276 * ATSC and DVB-C don't set, so, the core should fill it.
2277 *
2278 * On DVB-C Annex A and C, the bandwidth is a function of
2279 * the roll-off and symbol rate. Annex B defines different
2280 * roll-off factors depending on the modulation. Fortunately,
2281 * Annex B is only used with 6MHz, so there's no need to
2282 * calculate it.
2283 *
2284 * While not officially supported, a side effect of handling it at
2285 * the cache level is that a program could retrieve the bandwidth
2286 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2287 */
2288 switch (c->delivery_system) {
2289 case SYS_ATSC:
2290 case SYS_DVBC_ANNEX_B:
2291 c->bandwidth_hz = 6000000;
2292 break;
2293 case SYS_DVBC_ANNEX_A:
2294 rolloff = 115;
2295 break;
2296 case SYS_DVBC_ANNEX_C:
2297 rolloff = 113;
2298 break;
2299 case SYS_DSS:
2300 rolloff = 120;
2301 break;
2302 case SYS_DVBS:
2303 case SYS_TURBO:
2304 case SYS_ISDBS:
2305 rolloff = 135;
2306 break;
2307 case SYS_DVBS2:
2308 switch (c->rolloff) {
2309 case ROLLOFF_20:
2310 rolloff = 120;
2311 break;
2312 case ROLLOFF_25:
2313 rolloff = 125;
2314 break;
2315 default:
2316 case ROLLOFF_35:
2317 rolloff = 135;
2318 }
2319 break;
2320 default:
2321 break;
2322 }
2323 if (rolloff)
2324 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2325
2326 /* force auto frequency inversion if requested */
2327 if (dvb_force_auto_inversion)
2328 c->inversion = INVERSION_AUTO;
2329
2330 /*
2331 * without hierarchical coding code_rate_LP is irrelevant,
2332 * so we tolerate the otherwise invalid FEC_NONE setting
2333 */
2334 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2335 c->code_rate_LP = FEC_AUTO;
2336
2337 prepare_tuning_algo_parameters(fe);
2338
2339 fepriv->state = FESTATE_RETUNE;
2340
2341 /* Request the search algorithm to search */
2342 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2343
2344 dvb_frontend_clear_events(fe);
2345 dvb_frontend_add_event(fe, 0);
2346 dvb_frontend_wakeup(fe);
2347 fepriv->status = 0;
2348
2349 return 0;
2350 }
2351
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2352 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2353 struct dtv_properties *tvps)
2354 {
2355 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2356 struct dtv_property *tvp = NULL;
2357 struct dtv_frontend_properties getp;
2358 int i, err;
2359
2360 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2361
2362 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2363 __func__, tvps->num);
2364 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2365 __func__, tvps->props);
2366
2367 /*
2368 * Put an arbitrary limit on the number of messages that can
2369 * be sent at once
2370 */
2371 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2372 return -EINVAL;
2373
2374 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2375 if (IS_ERR(tvp))
2376 return PTR_ERR(tvp);
2377
2378 /*
2379 * Let's use our own copy of property cache, in order to
2380 * avoid mangling with DTV zigzag logic, as drivers might
2381 * return crap, if they don't check if the data is available
2382 * before updating the properties cache.
2383 */
2384 if (fepriv->state != FESTATE_IDLE) {
2385 err = dtv_get_frontend(fe, &getp, NULL);
2386 if (err < 0)
2387 goto out;
2388 }
2389 for (i = 0; i < tvps->num; i++) {
2390 err = dtv_property_process_get(fe, &getp,
2391 tvp + i, file);
2392 if (err < 0)
2393 goto out;
2394 }
2395
2396 if (copy_to_user((void __user *)tvps->props, tvp,
2397 tvps->num * sizeof(struct dtv_property))) {
2398 err = -EFAULT;
2399 goto out;
2400 }
2401
2402 err = 0;
2403 out:
2404 kfree(tvp);
2405 return err;
2406 }
2407
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2408 static int dvb_get_frontend(struct dvb_frontend *fe,
2409 struct dvb_frontend_parameters *p_out)
2410 {
2411 struct dtv_frontend_properties getp;
2412
2413 /*
2414 * Let's use our own copy of property cache, in order to
2415 * avoid mangling with DTV zigzag logic, as drivers might
2416 * return crap, if they don't check if the data is available
2417 * before updating the properties cache.
2418 */
2419 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2420
2421 return dtv_get_frontend(fe, &getp, p_out);
2422 }
2423
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2424 static int dvb_frontend_handle_ioctl(struct file *file,
2425 unsigned int cmd, void *parg)
2426 {
2427 struct dvb_device *dvbdev = file->private_data;
2428 struct dvb_frontend *fe = dvbdev->priv;
2429 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2430 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2431 int i, err = -ENOTSUPP;
2432
2433 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2434
2435 switch (cmd) {
2436 case FE_SET_PROPERTY: {
2437 struct dtv_properties *tvps = parg;
2438 struct dtv_property *tvp = NULL;
2439
2440 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2441 __func__, tvps->num);
2442 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2443 __func__, tvps->props);
2444
2445 /*
2446 * Put an arbitrary limit on the number of messages that can
2447 * be sent at once
2448 */
2449 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2450 return -EINVAL;
2451
2452 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2453 if (IS_ERR(tvp))
2454 return PTR_ERR(tvp);
2455
2456 for (i = 0; i < tvps->num; i++) {
2457 err = dtv_property_process_set(fe, file,
2458 (tvp + i)->cmd,
2459 (tvp + i)->u.data);
2460 if (err < 0) {
2461 kfree(tvp);
2462 return err;
2463 }
2464 }
2465 kfree(tvp);
2466 err = 0;
2467 break;
2468 }
2469 case FE_GET_PROPERTY:
2470 err = dvb_get_property(fe, file, parg);
2471 break;
2472
2473 case FE_GET_INFO: {
2474 struct dvb_frontend_info *info = parg;
2475 memset(info, 0, sizeof(*info));
2476
2477 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2478 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2479 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2480 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2481 info->caps = fe->ops.info.caps;
2482 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2483 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2484 &info->frequency_max,
2485 &info->frequency_tolerance);
2486
2487 /*
2488 * Associate the 4 delivery systems supported by DVBv3
2489 * API with their DVBv5 counterpart. For the other standards,
2490 * use the closest type, assuming that it would hopefully
2491 * work with a DVBv3 application.
2492 * It should be noticed that, on multi-frontend devices with
2493 * different types (terrestrial and cable, for example),
2494 * a pure DVBv3 application won't be able to use all delivery
2495 * systems. Yet, changing the DVBv5 cache to the other delivery
2496 * system should be enough for making it work.
2497 */
2498 switch (dvbv3_type(c->delivery_system)) {
2499 case DVBV3_QPSK:
2500 info->type = FE_QPSK;
2501 break;
2502 case DVBV3_ATSC:
2503 info->type = FE_ATSC;
2504 break;
2505 case DVBV3_QAM:
2506 info->type = FE_QAM;
2507 break;
2508 case DVBV3_OFDM:
2509 info->type = FE_OFDM;
2510 break;
2511 default:
2512 dev_err(fe->dvb->device,
2513 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2514 __func__, c->delivery_system);
2515 info->type = FE_OFDM;
2516 }
2517 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2518 __func__, c->delivery_system, info->type);
2519
2520 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2521 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2522 info->caps |= FE_CAN_INVERSION_AUTO;
2523 err = 0;
2524 break;
2525 }
2526
2527 case FE_READ_STATUS: {
2528 enum fe_status *status = parg;
2529
2530 /* if retune was requested but hasn't occurred yet, prevent
2531 * that user get signal state from previous tuning */
2532 if (fepriv->state == FESTATE_RETUNE ||
2533 fepriv->state == FESTATE_ERROR) {
2534 err = 0;
2535 *status = 0;
2536 break;
2537 }
2538
2539 if (fe->ops.read_status)
2540 err = fe->ops.read_status(fe, status);
2541 break;
2542 }
2543
2544 case FE_DISEQC_RESET_OVERLOAD:
2545 if (fe->ops.diseqc_reset_overload) {
2546 err = fe->ops.diseqc_reset_overload(fe);
2547 fepriv->state = FESTATE_DISEQC;
2548 fepriv->status = 0;
2549 }
2550 break;
2551
2552 case FE_DISEQC_SEND_MASTER_CMD:
2553 if (fe->ops.diseqc_send_master_cmd) {
2554 struct dvb_diseqc_master_cmd *cmd = parg;
2555
2556 if (cmd->msg_len > sizeof(cmd->msg)) {
2557 err = -EINVAL;
2558 break;
2559 }
2560 err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2561 fepriv->state = FESTATE_DISEQC;
2562 fepriv->status = 0;
2563 }
2564 break;
2565
2566 case FE_DISEQC_SEND_BURST:
2567 if (fe->ops.diseqc_send_burst) {
2568 err = fe->ops.diseqc_send_burst(fe, (long)parg);
2569 fepriv->state = FESTATE_DISEQC;
2570 fepriv->status = 0;
2571 }
2572 break;
2573
2574 case FE_SET_TONE:
2575 if (fe->ops.set_tone) {
2576 fepriv->tone = (long)parg;
2577 err = fe->ops.set_tone(fe, fepriv->tone);
2578 fepriv->state = FESTATE_DISEQC;
2579 fepriv->status = 0;
2580 }
2581 break;
2582
2583 case FE_SET_VOLTAGE:
2584 if (fe->ops.set_voltage) {
2585 fepriv->voltage = (long)parg;
2586 err = fe->ops.set_voltage(fe, fepriv->voltage);
2587 fepriv->state = FESTATE_DISEQC;
2588 fepriv->status = 0;
2589 }
2590 break;
2591
2592 case FE_DISEQC_RECV_SLAVE_REPLY:
2593 if (fe->ops.diseqc_recv_slave_reply)
2594 err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2595 break;
2596
2597 case FE_ENABLE_HIGH_LNB_VOLTAGE:
2598 if (fe->ops.enable_high_lnb_voltage)
2599 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2600 break;
2601
2602 case FE_SET_FRONTEND_TUNE_MODE:
2603 fepriv->tune_mode_flags = (unsigned long)parg;
2604 err = 0;
2605 break;
2606 /* DEPRECATED dish control ioctls */
2607
2608 case FE_DISHNETWORK_SEND_LEGACY_CMD:
2609 if (fe->ops.dishnetwork_send_legacy_command) {
2610 err = fe->ops.dishnetwork_send_legacy_command(fe,
2611 (unsigned long)parg);
2612 fepriv->state = FESTATE_DISEQC;
2613 fepriv->status = 0;
2614 } else if (fe->ops.set_voltage) {
2615 /*
2616 * NOTE: This is a fallback condition. Some frontends
2617 * (stv0299 for instance) take longer than 8msec to
2618 * respond to a set_voltage command. Those switches
2619 * need custom routines to switch properly. For all
2620 * other frontends, the following should work ok.
2621 * Dish network legacy switches (as used by Dish500)
2622 * are controlled by sending 9-bit command words
2623 * spaced 8msec apart.
2624 * the actual command word is switch/port dependent
2625 * so it is up to the userspace application to send
2626 * the right command.
2627 * The command must always start with a '0' after
2628 * initialization, so parg is 8 bits and does not
2629 * include the initialization or start bit
2630 */
2631 unsigned long swcmd = ((unsigned long)parg) << 1;
2632 ktime_t nexttime;
2633 ktime_t tv[10];
2634 int i;
2635 u8 last = 1;
2636
2637 if (dvb_frontend_debug)
2638 dprintk("switch command: 0x%04lx\n",
2639 swcmd);
2640 nexttime = ktime_get_boottime();
2641 if (dvb_frontend_debug)
2642 tv[0] = nexttime;
2643 /* before sending a command, initialize by sending
2644 * a 32ms 18V to the switch
2645 */
2646 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2647 dvb_frontend_sleep_until(&nexttime, 32000);
2648
2649 for (i = 0; i < 9; i++) {
2650 if (dvb_frontend_debug)
2651 tv[i + 1] = ktime_get_boottime();
2652 if ((swcmd & 0x01) != last) {
2653 /* set voltage to (last ? 13V : 18V) */
2654 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2655 last = (last) ? 0 : 1;
2656 }
2657 swcmd = swcmd >> 1;
2658 if (i != 8)
2659 dvb_frontend_sleep_until(&nexttime, 8000);
2660 }
2661 if (dvb_frontend_debug) {
2662 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2663 fe->dvb->num);
2664 for (i = 1; i < 10; i++)
2665 pr_info("%d: %d\n", i,
2666 (int)ktime_us_delta(tv[i], tv[i - 1]));
2667 }
2668 err = 0;
2669 fepriv->state = FESTATE_DISEQC;
2670 fepriv->status = 0;
2671 }
2672 break;
2673
2674 /* DEPRECATED statistics ioctls */
2675
2676 case FE_READ_BER:
2677 if (fe->ops.read_ber) {
2678 if (fepriv->thread)
2679 err = fe->ops.read_ber(fe, parg);
2680 else
2681 err = -EAGAIN;
2682 }
2683 break;
2684
2685 case FE_READ_SIGNAL_STRENGTH:
2686 if (fe->ops.read_signal_strength) {
2687 if (fepriv->thread)
2688 err = fe->ops.read_signal_strength(fe, parg);
2689 else
2690 err = -EAGAIN;
2691 }
2692 break;
2693
2694 case FE_READ_SNR:
2695 if (fe->ops.read_snr) {
2696 if (fepriv->thread)
2697 err = fe->ops.read_snr(fe, parg);
2698 else
2699 err = -EAGAIN;
2700 }
2701 break;
2702
2703 case FE_READ_UNCORRECTED_BLOCKS:
2704 if (fe->ops.read_ucblocks) {
2705 if (fepriv->thread)
2706 err = fe->ops.read_ucblocks(fe, parg);
2707 else
2708 err = -EAGAIN;
2709 }
2710 break;
2711
2712 /* DEPRECATED DVBv3 ioctls */
2713
2714 case FE_SET_FRONTEND:
2715 err = dvbv3_set_delivery_system(fe);
2716 if (err)
2717 break;
2718
2719 err = dtv_property_cache_sync(fe, c, parg);
2720 if (err)
2721 break;
2722 err = dtv_set_frontend(fe);
2723 break;
2724
2725 case FE_GET_EVENT:
2726 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2727 break;
2728
2729 case FE_GET_FRONTEND:
2730 err = dvb_get_frontend(fe, parg);
2731 break;
2732
2733 default:
2734 return -ENOTSUPP;
2735 } /* switch */
2736
2737 return err;
2738 }
2739
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2740 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2741 {
2742 struct dvb_device *dvbdev = file->private_data;
2743 struct dvb_frontend *fe = dvbdev->priv;
2744 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2745
2746 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2747
2748 poll_wait(file, &fepriv->events.wait_queue, wait);
2749
2750 if (fepriv->events.eventw != fepriv->events.eventr)
2751 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2752
2753 return 0;
2754 }
2755
dvb_frontend_open(struct inode * inode,struct file * file)2756 static int dvb_frontend_open(struct inode *inode, struct file *file)
2757 {
2758 struct dvb_device *dvbdev = file->private_data;
2759 struct dvb_frontend *fe = dvbdev->priv;
2760 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2761 struct dvb_adapter *adapter = fe->dvb;
2762 int ret;
2763
2764 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2765 if (fe->exit == DVB_FE_DEVICE_REMOVED)
2766 return -ENODEV;
2767
2768 if (adapter->mfe_shared == 2) {
2769 mutex_lock(&adapter->mfe_lock);
2770 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2771 if (adapter->mfe_dvbdev &&
2772 !adapter->mfe_dvbdev->writers) {
2773 mutex_unlock(&adapter->mfe_lock);
2774 return -EBUSY;
2775 }
2776 adapter->mfe_dvbdev = dvbdev;
2777 }
2778 } else if (adapter->mfe_shared) {
2779 mutex_lock(&adapter->mfe_lock);
2780
2781 if (!adapter->mfe_dvbdev)
2782 adapter->mfe_dvbdev = dvbdev;
2783
2784 else if (adapter->mfe_dvbdev != dvbdev) {
2785 struct dvb_device
2786 *mfedev = adapter->mfe_dvbdev;
2787 struct dvb_frontend
2788 *mfe = mfedev->priv;
2789 struct dvb_frontend_private
2790 *mfepriv = mfe->frontend_priv;
2791 int mferetry = (dvb_mfe_wait_time << 1);
2792
2793 mutex_unlock(&adapter->mfe_lock);
2794 while (mferetry-- && (mfedev->users != -1 ||
2795 mfepriv->thread)) {
2796 if (msleep_interruptible(500)) {
2797 if (signal_pending(current))
2798 return -EINTR;
2799 }
2800 }
2801
2802 mutex_lock(&adapter->mfe_lock);
2803 if (adapter->mfe_dvbdev != dvbdev) {
2804 mfedev = adapter->mfe_dvbdev;
2805 mfe = mfedev->priv;
2806 mfepriv = mfe->frontend_priv;
2807 if (mfedev->users != -1 ||
2808 mfepriv->thread) {
2809 mutex_unlock(&adapter->mfe_lock);
2810 return -EBUSY;
2811 }
2812 adapter->mfe_dvbdev = dvbdev;
2813 }
2814 }
2815 }
2816
2817 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2818 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2819 goto err0;
2820
2821 /* If we took control of the bus, we need to force
2822 reinitialization. This is because many ts_bus_ctrl()
2823 functions strobe the RESET pin on the demod, and if the
2824 frontend thread already exists then the dvb_init() routine
2825 won't get called (which is what usually does initial
2826 register configuration). */
2827 fepriv->reinitialise = 1;
2828 }
2829
2830 if ((ret = dvb_generic_open(inode, file)) < 0)
2831 goto err1;
2832
2833 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2834 /* normal tune mode when opened R/W */
2835 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2836 fepriv->tone = -1;
2837 fepriv->voltage = -1;
2838
2839 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2840 mutex_lock(&fe->dvb->mdev_lock);
2841 if (fe->dvb->mdev) {
2842 mutex_lock(&fe->dvb->mdev->graph_mutex);
2843 if (fe->dvb->mdev->enable_source)
2844 ret = fe->dvb->mdev->enable_source(
2845 dvbdev->entity,
2846 &fepriv->pipe);
2847 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2848 if (ret) {
2849 mutex_unlock(&fe->dvb->mdev_lock);
2850 dev_err(fe->dvb->device,
2851 "Tuner is busy. Error %d\n", ret);
2852 goto err2;
2853 }
2854 }
2855 mutex_unlock(&fe->dvb->mdev_lock);
2856 #endif
2857 ret = dvb_frontend_start(fe);
2858 if (ret)
2859 goto err3;
2860
2861 /* empty event queue */
2862 fepriv->events.eventr = fepriv->events.eventw = 0;
2863 }
2864
2865 dvb_frontend_get(fe);
2866
2867 if (adapter->mfe_shared)
2868 mutex_unlock(&adapter->mfe_lock);
2869 return ret;
2870
2871 err3:
2872 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2873 mutex_lock(&fe->dvb->mdev_lock);
2874 if (fe->dvb->mdev) {
2875 mutex_lock(&fe->dvb->mdev->graph_mutex);
2876 if (fe->dvb->mdev->disable_source)
2877 fe->dvb->mdev->disable_source(dvbdev->entity);
2878 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2879 }
2880 mutex_unlock(&fe->dvb->mdev_lock);
2881 err2:
2882 #endif
2883 dvb_generic_release(inode, file);
2884 err1:
2885 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2886 fe->ops.ts_bus_ctrl(fe, 0);
2887 err0:
2888 if (adapter->mfe_shared)
2889 mutex_unlock(&adapter->mfe_lock);
2890 return ret;
2891 }
2892
dvb_frontend_release(struct inode * inode,struct file * file)2893 static int dvb_frontend_release(struct inode *inode, struct file *file)
2894 {
2895 struct dvb_device *dvbdev = file->private_data;
2896 struct dvb_frontend *fe = dvbdev->priv;
2897 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2898 int ret;
2899
2900 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2901
2902 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2903 fepriv->release_jiffies = jiffies;
2904 mb();
2905 }
2906
2907 ret = dvb_generic_release(inode, file);
2908
2909 if (dvbdev->users == -1) {
2910 wake_up(&fepriv->wait_queue);
2911 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2912 mutex_lock(&fe->dvb->mdev_lock);
2913 if (fe->dvb->mdev) {
2914 mutex_lock(&fe->dvb->mdev->graph_mutex);
2915 if (fe->dvb->mdev->disable_source)
2916 fe->dvb->mdev->disable_source(dvbdev->entity);
2917 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2918 }
2919 mutex_unlock(&fe->dvb->mdev_lock);
2920 #endif
2921 if (fe->exit != DVB_FE_NO_EXIT)
2922 wake_up(&dvbdev->wait_queue);
2923 if (fe->ops.ts_bus_ctrl)
2924 fe->ops.ts_bus_ctrl(fe, 0);
2925 }
2926
2927 dvb_frontend_put(fe);
2928
2929 return ret;
2930 }
2931
2932 static const struct file_operations dvb_frontend_fops = {
2933 .owner = THIS_MODULE,
2934 .unlocked_ioctl = dvb_frontend_ioctl,
2935 #ifdef CONFIG_COMPAT
2936 .compat_ioctl = dvb_frontend_compat_ioctl,
2937 #endif
2938 .poll = dvb_frontend_poll,
2939 .open = dvb_frontend_open,
2940 .release = dvb_frontend_release,
2941 .llseek = noop_llseek,
2942 };
2943
dvb_frontend_suspend(struct dvb_frontend * fe)2944 int dvb_frontend_suspend(struct dvb_frontend *fe)
2945 {
2946 int ret = 0;
2947
2948 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2949 fe->id);
2950
2951 if (fe->ops.tuner_ops.suspend)
2952 ret = fe->ops.tuner_ops.suspend(fe);
2953 else if (fe->ops.tuner_ops.sleep)
2954 ret = fe->ops.tuner_ops.sleep(fe);
2955
2956 if (fe->ops.suspend)
2957 ret = fe->ops.suspend(fe);
2958 else if (fe->ops.sleep)
2959 ret = fe->ops.sleep(fe);
2960
2961 return ret;
2962 }
2963 EXPORT_SYMBOL(dvb_frontend_suspend);
2964
dvb_frontend_resume(struct dvb_frontend * fe)2965 int dvb_frontend_resume(struct dvb_frontend *fe)
2966 {
2967 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2968 int ret = 0;
2969
2970 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2971 fe->id);
2972
2973 fe->exit = DVB_FE_DEVICE_RESUME;
2974 if (fe->ops.resume)
2975 ret = fe->ops.resume(fe);
2976 else if (fe->ops.init)
2977 ret = fe->ops.init(fe);
2978
2979 if (fe->ops.tuner_ops.resume)
2980 ret = fe->ops.tuner_ops.resume(fe);
2981 else if (fe->ops.tuner_ops.init)
2982 ret = fe->ops.tuner_ops.init(fe);
2983
2984 if (fe->ops.set_tone && fepriv->tone != -1)
2985 fe->ops.set_tone(fe, fepriv->tone);
2986 if (fe->ops.set_voltage && fepriv->voltage != -1)
2987 fe->ops.set_voltage(fe, fepriv->voltage);
2988
2989 fe->exit = DVB_FE_NO_EXIT;
2990 fepriv->state = FESTATE_RETUNE;
2991 dvb_frontend_wakeup(fe);
2992
2993 return ret;
2994 }
2995 EXPORT_SYMBOL(dvb_frontend_resume);
2996
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)2997 int dvb_register_frontend(struct dvb_adapter *dvb,
2998 struct dvb_frontend *fe)
2999 {
3000 struct dvb_frontend_private *fepriv;
3001 const struct dvb_device dvbdev_template = {
3002 .users = ~0,
3003 .writers = 1,
3004 .readers = (~0) - 1,
3005 .fops = &dvb_frontend_fops,
3006 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3007 .name = fe->ops.info.name,
3008 #endif
3009 };
3010 int ret;
3011
3012 dev_dbg(dvb->device, "%s:\n", __func__);
3013
3014 if (mutex_lock_interruptible(&frontend_mutex))
3015 return -ERESTARTSYS;
3016
3017 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3018 if (!fe->frontend_priv) {
3019 mutex_unlock(&frontend_mutex);
3020 return -ENOMEM;
3021 }
3022 fepriv = fe->frontend_priv;
3023
3024 kref_init(&fe->refcount);
3025
3026 /*
3027 * After initialization, there need to be two references: one
3028 * for dvb_unregister_frontend(), and another one for
3029 * dvb_frontend_detach().
3030 */
3031 dvb_frontend_get(fe);
3032
3033 sema_init(&fepriv->sem, 1);
3034 init_waitqueue_head(&fepriv->wait_queue);
3035 init_waitqueue_head(&fepriv->events.wait_queue);
3036 mutex_init(&fepriv->events.mtx);
3037 fe->dvb = dvb;
3038 fepriv->inversion = INVERSION_OFF;
3039
3040 dev_info(fe->dvb->device,
3041 "DVB: registering adapter %i frontend %i (%s)...\n",
3042 fe->dvb->num, fe->id, fe->ops.info.name);
3043
3044 ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3045 fe, DVB_DEVICE_FRONTEND, 0);
3046 if (ret) {
3047 dvb_frontend_put(fe);
3048 mutex_unlock(&frontend_mutex);
3049 return ret;
3050 }
3051
3052 /*
3053 * Initialize the cache to the proper values according with the
3054 * first supported delivery system (ops->delsys[0])
3055 */
3056
3057 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3058 dvb_frontend_clear_cache(fe);
3059
3060 mutex_unlock(&frontend_mutex);
3061 return 0;
3062 }
3063 EXPORT_SYMBOL(dvb_register_frontend);
3064
dvb_unregister_frontend(struct dvb_frontend * fe)3065 int dvb_unregister_frontend(struct dvb_frontend *fe)
3066 {
3067 struct dvb_frontend_private *fepriv = fe->frontend_priv;
3068
3069 dev_dbg(fe->dvb->device, "%s:\n", __func__);
3070
3071 mutex_lock(&frontend_mutex);
3072 dvb_frontend_stop(fe);
3073 dvb_remove_device(fepriv->dvbdev);
3074
3075 /* fe is invalid now */
3076 mutex_unlock(&frontend_mutex);
3077 dvb_frontend_put(fe);
3078 return 0;
3079 }
3080 EXPORT_SYMBOL(dvb_unregister_frontend);
3081
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3082 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3083 void (*release)(struct dvb_frontend *fe))
3084 {
3085 if (release) {
3086 release(fe);
3087 #ifdef CONFIG_MEDIA_ATTACH
3088 dvb_detach(release);
3089 #endif
3090 }
3091 }
3092
dvb_frontend_detach(struct dvb_frontend * fe)3093 void dvb_frontend_detach(struct dvb_frontend *fe)
3094 {
3095 dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3096 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3097 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3098 dvb_frontend_put(fe);
3099 }
3100 EXPORT_SYMBOL(dvb_frontend_detach);
3101