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_DVBS:
922 case SYS_DVBS2:
923 case SYS_TURBO:
924 case SYS_ISDBS:
925 *freq_min /= kHz;
926 *freq_max /= kHz;
927 if (tolerance)
928 *tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
929
930 break;
931 default:
932 if (tolerance)
933 *tolerance = fe->ops.info.frequency_tolerance_hz;
934 break;
935 }
936 }
937
dvb_frontend_get_stepsize(struct dvb_frontend * fe)938 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
939 {
940 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
941 u32 fe_step = fe->ops.info.frequency_stepsize_hz;
942 u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
943 u32 step = max(fe_step, tuner_step);
944
945 switch (c->delivery_system) {
946 case SYS_DVBS:
947 case SYS_DVBS2:
948 case SYS_TURBO:
949 case SYS_ISDBS:
950 step /= kHz;
951 break;
952 default:
953 break;
954 }
955
956 return step;
957 }
958
dvb_frontend_check_parameters(struct dvb_frontend * fe)959 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
960 {
961 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
962 u32 freq_min;
963 u32 freq_max;
964
965 /* range check: frequency */
966 dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
967 if ((freq_min && c->frequency < freq_min) ||
968 (freq_max && c->frequency > freq_max)) {
969 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
970 fe->dvb->num, fe->id, c->frequency,
971 freq_min, freq_max);
972 return -EINVAL;
973 }
974
975 /* range check: symbol rate */
976 switch (c->delivery_system) {
977 case SYS_DVBS:
978 case SYS_DVBS2:
979 case SYS_TURBO:
980 case SYS_DVBC_ANNEX_A:
981 case SYS_DVBC_ANNEX_C:
982 if ((fe->ops.info.symbol_rate_min &&
983 c->symbol_rate < fe->ops.info.symbol_rate_min) ||
984 (fe->ops.info.symbol_rate_max &&
985 c->symbol_rate > fe->ops.info.symbol_rate_max)) {
986 dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
987 fe->dvb->num, fe->id, c->symbol_rate,
988 fe->ops.info.symbol_rate_min,
989 fe->ops.info.symbol_rate_max);
990 return -EINVAL;
991 }
992 break;
993 default:
994 break;
995 }
996
997 return 0;
998 }
999
dvb_frontend_clear_cache(struct dvb_frontend * fe)1000 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1001 {
1002 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1003 int i;
1004 u32 delsys;
1005
1006 delsys = c->delivery_system;
1007 memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1008 c->delivery_system = delsys;
1009
1010 dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1011 __func__, c->delivery_system);
1012
1013 c->transmission_mode = TRANSMISSION_MODE_AUTO;
1014 c->bandwidth_hz = 0; /* AUTO */
1015 c->guard_interval = GUARD_INTERVAL_AUTO;
1016 c->hierarchy = HIERARCHY_AUTO;
1017 c->symbol_rate = 0;
1018 c->code_rate_HP = FEC_AUTO;
1019 c->code_rate_LP = FEC_AUTO;
1020 c->fec_inner = FEC_AUTO;
1021 c->rolloff = ROLLOFF_AUTO;
1022 c->voltage = SEC_VOLTAGE_OFF;
1023 c->sectone = SEC_TONE_OFF;
1024 c->pilot = PILOT_AUTO;
1025
1026 c->isdbt_partial_reception = 0;
1027 c->isdbt_sb_mode = 0;
1028 c->isdbt_sb_subchannel = 0;
1029 c->isdbt_sb_segment_idx = 0;
1030 c->isdbt_sb_segment_count = 0;
1031 c->isdbt_layer_enabled = 7; /* All layers (A,B,C) */
1032 for (i = 0; i < 3; i++) {
1033 c->layer[i].fec = FEC_AUTO;
1034 c->layer[i].modulation = QAM_AUTO;
1035 c->layer[i].interleaving = 0;
1036 c->layer[i].segment_count = 0;
1037 }
1038
1039 c->stream_id = NO_STREAM_ID_FILTER;
1040 c->scrambling_sequence_index = 0;/* default sequence */
1041
1042 switch (c->delivery_system) {
1043 case SYS_DVBS:
1044 case SYS_DVBS2:
1045 case SYS_TURBO:
1046 c->modulation = QPSK; /* implied for DVB-S in legacy API */
1047 c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1048 break;
1049 case SYS_ATSC:
1050 c->modulation = VSB_8;
1051 break;
1052 case SYS_ISDBS:
1053 c->symbol_rate = 28860000;
1054 c->rolloff = ROLLOFF_35;
1055 c->bandwidth_hz = c->symbol_rate / 100 * 135;
1056 break;
1057 default:
1058 c->modulation = QAM_AUTO;
1059 break;
1060 }
1061
1062 c->lna = LNA_AUTO;
1063
1064 return 0;
1065 }
1066
1067 #define _DTV_CMD(n) \
1068 [n] = #n
1069
1070 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1071 _DTV_CMD(DTV_TUNE),
1072 _DTV_CMD(DTV_CLEAR),
1073
1074 /* Set */
1075 _DTV_CMD(DTV_FREQUENCY),
1076 _DTV_CMD(DTV_BANDWIDTH_HZ),
1077 _DTV_CMD(DTV_MODULATION),
1078 _DTV_CMD(DTV_INVERSION),
1079 _DTV_CMD(DTV_DISEQC_MASTER),
1080 _DTV_CMD(DTV_SYMBOL_RATE),
1081 _DTV_CMD(DTV_INNER_FEC),
1082 _DTV_CMD(DTV_VOLTAGE),
1083 _DTV_CMD(DTV_TONE),
1084 _DTV_CMD(DTV_PILOT),
1085 _DTV_CMD(DTV_ROLLOFF),
1086 _DTV_CMD(DTV_DELIVERY_SYSTEM),
1087 _DTV_CMD(DTV_HIERARCHY),
1088 _DTV_CMD(DTV_CODE_RATE_HP),
1089 _DTV_CMD(DTV_CODE_RATE_LP),
1090 _DTV_CMD(DTV_GUARD_INTERVAL),
1091 _DTV_CMD(DTV_TRANSMISSION_MODE),
1092 _DTV_CMD(DTV_INTERLEAVING),
1093
1094 _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1095 _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1096 _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1097 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1098 _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1099 _DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1100 _DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1101 _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1102 _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1103 _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1104 _DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1105 _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1106 _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1107 _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1108 _DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1109 _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1110 _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1111 _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1112
1113 _DTV_CMD(DTV_STREAM_ID),
1114 _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1115 _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1116 _DTV_CMD(DTV_LNA),
1117
1118 /* Get */
1119 _DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1120 _DTV_CMD(DTV_API_VERSION),
1121
1122 _DTV_CMD(DTV_ENUM_DELSYS),
1123
1124 _DTV_CMD(DTV_ATSCMH_PARADE_ID),
1125 _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1126
1127 _DTV_CMD(DTV_ATSCMH_FIC_VER),
1128 _DTV_CMD(DTV_ATSCMH_NOG),
1129 _DTV_CMD(DTV_ATSCMH_TNOG),
1130 _DTV_CMD(DTV_ATSCMH_SGN),
1131 _DTV_CMD(DTV_ATSCMH_PRC),
1132 _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1133 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1134 _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1135 _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1136 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1137 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1138 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1139 _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1140
1141 /* Statistics API */
1142 _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1143 _DTV_CMD(DTV_STAT_CNR),
1144 _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1145 _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1146 _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1147 _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1148 _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1149 _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1150 };
1151
dtv_cmd_name(u32 cmd)1152 static char *dtv_cmd_name(u32 cmd)
1153 {
1154 cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1155 return dtv_cmds[cmd];
1156 }
1157
1158 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1159 * drivers can use a single set_frontend tuning function, regardless of whether
1160 * it's being used for the legacy or new API, reducing code and complexity.
1161 */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1162 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1163 struct dtv_frontend_properties *c,
1164 const struct dvb_frontend_parameters *p)
1165 {
1166 c->frequency = p->frequency;
1167 c->inversion = p->inversion;
1168
1169 switch (dvbv3_type(c->delivery_system)) {
1170 case DVBV3_QPSK:
1171 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1172 c->symbol_rate = p->u.qpsk.symbol_rate;
1173 c->fec_inner = p->u.qpsk.fec_inner;
1174 break;
1175 case DVBV3_QAM:
1176 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1177 c->symbol_rate = p->u.qam.symbol_rate;
1178 c->fec_inner = p->u.qam.fec_inner;
1179 c->modulation = p->u.qam.modulation;
1180 break;
1181 case DVBV3_OFDM:
1182 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1183
1184 switch (p->u.ofdm.bandwidth) {
1185 case BANDWIDTH_10_MHZ:
1186 c->bandwidth_hz = 10000000;
1187 break;
1188 case BANDWIDTH_8_MHZ:
1189 c->bandwidth_hz = 8000000;
1190 break;
1191 case BANDWIDTH_7_MHZ:
1192 c->bandwidth_hz = 7000000;
1193 break;
1194 case BANDWIDTH_6_MHZ:
1195 c->bandwidth_hz = 6000000;
1196 break;
1197 case BANDWIDTH_5_MHZ:
1198 c->bandwidth_hz = 5000000;
1199 break;
1200 case BANDWIDTH_1_712_MHZ:
1201 c->bandwidth_hz = 1712000;
1202 break;
1203 case BANDWIDTH_AUTO:
1204 c->bandwidth_hz = 0;
1205 }
1206
1207 c->code_rate_HP = p->u.ofdm.code_rate_HP;
1208 c->code_rate_LP = p->u.ofdm.code_rate_LP;
1209 c->modulation = p->u.ofdm.constellation;
1210 c->transmission_mode = p->u.ofdm.transmission_mode;
1211 c->guard_interval = p->u.ofdm.guard_interval;
1212 c->hierarchy = p->u.ofdm.hierarchy_information;
1213 break;
1214 case DVBV3_ATSC:
1215 dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1216 c->modulation = p->u.vsb.modulation;
1217 if (c->delivery_system == SYS_ATSCMH)
1218 break;
1219 if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1220 c->delivery_system = SYS_ATSC;
1221 else
1222 c->delivery_system = SYS_DVBC_ANNEX_B;
1223 break;
1224 case DVBV3_UNKNOWN:
1225 dev_err(fe->dvb->device,
1226 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1227 __func__, c->delivery_system);
1228 return -EINVAL;
1229 }
1230
1231 return 0;
1232 }
1233
1234 /* Ensure the cached values are set correctly in the frontend
1235 * legacy tuning structures, for the advanced tuning API.
1236 */
1237 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1238 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1239 const struct dtv_frontend_properties *c,
1240 struct dvb_frontend_parameters *p)
1241 {
1242 p->frequency = c->frequency;
1243 p->inversion = c->inversion;
1244
1245 switch (dvbv3_type(c->delivery_system)) {
1246 case DVBV3_UNKNOWN:
1247 dev_err(fe->dvb->device,
1248 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1249 __func__, c->delivery_system);
1250 return -EINVAL;
1251 case DVBV3_QPSK:
1252 dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1253 p->u.qpsk.symbol_rate = c->symbol_rate;
1254 p->u.qpsk.fec_inner = c->fec_inner;
1255 break;
1256 case DVBV3_QAM:
1257 dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1258 p->u.qam.symbol_rate = c->symbol_rate;
1259 p->u.qam.fec_inner = c->fec_inner;
1260 p->u.qam.modulation = c->modulation;
1261 break;
1262 case DVBV3_OFDM:
1263 dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1264 switch (c->bandwidth_hz) {
1265 case 10000000:
1266 p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1267 break;
1268 case 8000000:
1269 p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1270 break;
1271 case 7000000:
1272 p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1273 break;
1274 case 6000000:
1275 p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1276 break;
1277 case 5000000:
1278 p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1279 break;
1280 case 1712000:
1281 p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1282 break;
1283 case 0:
1284 default:
1285 p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1286 }
1287 p->u.ofdm.code_rate_HP = c->code_rate_HP;
1288 p->u.ofdm.code_rate_LP = c->code_rate_LP;
1289 p->u.ofdm.constellation = c->modulation;
1290 p->u.ofdm.transmission_mode = c->transmission_mode;
1291 p->u.ofdm.guard_interval = c->guard_interval;
1292 p->u.ofdm.hierarchy_information = c->hierarchy;
1293 break;
1294 case DVBV3_ATSC:
1295 dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1296 p->u.vsb.modulation = c->modulation;
1297 break;
1298 }
1299 return 0;
1300 }
1301
1302 /**
1303 * dtv_get_frontend - calls a callback for retrieving DTV parameters
1304 * @fe: struct dvb_frontend pointer
1305 * @c: struct dtv_frontend_properties pointer (DVBv5 cache)
1306 * @p_out: struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1307 *
1308 * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1309 * If c is not null, it will update the DVBv5 cache struct pointed by it.
1310 * If p_out is not null, it will update the DVBv3 params pointed by it.
1311 */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1312 static int dtv_get_frontend(struct dvb_frontend *fe,
1313 struct dtv_frontend_properties *c,
1314 struct dvb_frontend_parameters *p_out)
1315 {
1316 int r;
1317
1318 if (fe->ops.get_frontend) {
1319 r = fe->ops.get_frontend(fe, c);
1320 if (unlikely(r < 0))
1321 return r;
1322 if (p_out)
1323 dtv_property_legacy_params_sync(fe, c, p_out);
1324 return 0;
1325 }
1326
1327 /* As everything is in cache, get_frontend fops are always supported */
1328 return 0;
1329 }
1330
1331 static int dvb_frontend_handle_ioctl(struct file *file,
1332 unsigned int cmd, void *parg);
1333
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1334 static int dtv_property_process_get(struct dvb_frontend *fe,
1335 const struct dtv_frontend_properties *c,
1336 struct dtv_property *tvp,
1337 struct file *file)
1338 {
1339 int ncaps;
1340 unsigned int len = 1;
1341
1342 switch (tvp->cmd) {
1343 case DTV_ENUM_DELSYS:
1344 ncaps = 0;
1345 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1346 tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1347 ncaps++;
1348 }
1349 tvp->u.buffer.len = ncaps;
1350 len = ncaps;
1351 break;
1352 case DTV_FREQUENCY:
1353 tvp->u.data = c->frequency;
1354 break;
1355 case DTV_MODULATION:
1356 tvp->u.data = c->modulation;
1357 break;
1358 case DTV_BANDWIDTH_HZ:
1359 tvp->u.data = c->bandwidth_hz;
1360 break;
1361 case DTV_INVERSION:
1362 tvp->u.data = c->inversion;
1363 break;
1364 case DTV_SYMBOL_RATE:
1365 tvp->u.data = c->symbol_rate;
1366 break;
1367 case DTV_INNER_FEC:
1368 tvp->u.data = c->fec_inner;
1369 break;
1370 case DTV_PILOT:
1371 tvp->u.data = c->pilot;
1372 break;
1373 case DTV_ROLLOFF:
1374 tvp->u.data = c->rolloff;
1375 break;
1376 case DTV_DELIVERY_SYSTEM:
1377 tvp->u.data = c->delivery_system;
1378 break;
1379 case DTV_VOLTAGE:
1380 tvp->u.data = c->voltage;
1381 break;
1382 case DTV_TONE:
1383 tvp->u.data = c->sectone;
1384 break;
1385 case DTV_API_VERSION:
1386 tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1387 break;
1388 case DTV_CODE_RATE_HP:
1389 tvp->u.data = c->code_rate_HP;
1390 break;
1391 case DTV_CODE_RATE_LP:
1392 tvp->u.data = c->code_rate_LP;
1393 break;
1394 case DTV_GUARD_INTERVAL:
1395 tvp->u.data = c->guard_interval;
1396 break;
1397 case DTV_TRANSMISSION_MODE:
1398 tvp->u.data = c->transmission_mode;
1399 break;
1400 case DTV_HIERARCHY:
1401 tvp->u.data = c->hierarchy;
1402 break;
1403 case DTV_INTERLEAVING:
1404 tvp->u.data = c->interleaving;
1405 break;
1406
1407 /* ISDB-T Support here */
1408 case DTV_ISDBT_PARTIAL_RECEPTION:
1409 tvp->u.data = c->isdbt_partial_reception;
1410 break;
1411 case DTV_ISDBT_SOUND_BROADCASTING:
1412 tvp->u.data = c->isdbt_sb_mode;
1413 break;
1414 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1415 tvp->u.data = c->isdbt_sb_subchannel;
1416 break;
1417 case DTV_ISDBT_SB_SEGMENT_IDX:
1418 tvp->u.data = c->isdbt_sb_segment_idx;
1419 break;
1420 case DTV_ISDBT_SB_SEGMENT_COUNT:
1421 tvp->u.data = c->isdbt_sb_segment_count;
1422 break;
1423 case DTV_ISDBT_LAYER_ENABLED:
1424 tvp->u.data = c->isdbt_layer_enabled;
1425 break;
1426 case DTV_ISDBT_LAYERA_FEC:
1427 tvp->u.data = c->layer[0].fec;
1428 break;
1429 case DTV_ISDBT_LAYERA_MODULATION:
1430 tvp->u.data = c->layer[0].modulation;
1431 break;
1432 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1433 tvp->u.data = c->layer[0].segment_count;
1434 break;
1435 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1436 tvp->u.data = c->layer[0].interleaving;
1437 break;
1438 case DTV_ISDBT_LAYERB_FEC:
1439 tvp->u.data = c->layer[1].fec;
1440 break;
1441 case DTV_ISDBT_LAYERB_MODULATION:
1442 tvp->u.data = c->layer[1].modulation;
1443 break;
1444 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1445 tvp->u.data = c->layer[1].segment_count;
1446 break;
1447 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1448 tvp->u.data = c->layer[1].interleaving;
1449 break;
1450 case DTV_ISDBT_LAYERC_FEC:
1451 tvp->u.data = c->layer[2].fec;
1452 break;
1453 case DTV_ISDBT_LAYERC_MODULATION:
1454 tvp->u.data = c->layer[2].modulation;
1455 break;
1456 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1457 tvp->u.data = c->layer[2].segment_count;
1458 break;
1459 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1460 tvp->u.data = c->layer[2].interleaving;
1461 break;
1462
1463 /* Multistream support */
1464 case DTV_STREAM_ID:
1465 case DTV_DVBT2_PLP_ID_LEGACY:
1466 tvp->u.data = c->stream_id;
1467 break;
1468
1469 /* Physical layer scrambling support */
1470 case DTV_SCRAMBLING_SEQUENCE_INDEX:
1471 tvp->u.data = c->scrambling_sequence_index;
1472 break;
1473
1474 /* ATSC-MH */
1475 case DTV_ATSCMH_FIC_VER:
1476 tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1477 break;
1478 case DTV_ATSCMH_PARADE_ID:
1479 tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1480 break;
1481 case DTV_ATSCMH_NOG:
1482 tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1483 break;
1484 case DTV_ATSCMH_TNOG:
1485 tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1486 break;
1487 case DTV_ATSCMH_SGN:
1488 tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1489 break;
1490 case DTV_ATSCMH_PRC:
1491 tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1492 break;
1493 case DTV_ATSCMH_RS_FRAME_MODE:
1494 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1495 break;
1496 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1497 tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1498 break;
1499 case DTV_ATSCMH_RS_CODE_MODE_PRI:
1500 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1501 break;
1502 case DTV_ATSCMH_RS_CODE_MODE_SEC:
1503 tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1504 break;
1505 case DTV_ATSCMH_SCCC_BLOCK_MODE:
1506 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1507 break;
1508 case DTV_ATSCMH_SCCC_CODE_MODE_A:
1509 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1510 break;
1511 case DTV_ATSCMH_SCCC_CODE_MODE_B:
1512 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1513 break;
1514 case DTV_ATSCMH_SCCC_CODE_MODE_C:
1515 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1516 break;
1517 case DTV_ATSCMH_SCCC_CODE_MODE_D:
1518 tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1519 break;
1520
1521 case DTV_LNA:
1522 tvp->u.data = c->lna;
1523 break;
1524
1525 /* Fill quality measures */
1526 case DTV_STAT_SIGNAL_STRENGTH:
1527 tvp->u.st = c->strength;
1528 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1529 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1530 len = tvp->u.buffer.len;
1531 break;
1532 case DTV_STAT_CNR:
1533 tvp->u.st = c->cnr;
1534 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1535 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1536 len = tvp->u.buffer.len;
1537 break;
1538 case DTV_STAT_PRE_ERROR_BIT_COUNT:
1539 tvp->u.st = c->pre_bit_error;
1540 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1541 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1542 len = tvp->u.buffer.len;
1543 break;
1544 case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1545 tvp->u.st = c->pre_bit_count;
1546 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1547 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1548 len = tvp->u.buffer.len;
1549 break;
1550 case DTV_STAT_POST_ERROR_BIT_COUNT:
1551 tvp->u.st = c->post_bit_error;
1552 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1553 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1554 len = tvp->u.buffer.len;
1555 break;
1556 case DTV_STAT_POST_TOTAL_BIT_COUNT:
1557 tvp->u.st = c->post_bit_count;
1558 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1559 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1560 len = tvp->u.buffer.len;
1561 break;
1562 case DTV_STAT_ERROR_BLOCK_COUNT:
1563 tvp->u.st = c->block_error;
1564 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1565 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1566 len = tvp->u.buffer.len;
1567 break;
1568 case DTV_STAT_TOTAL_BLOCK_COUNT:
1569 tvp->u.st = c->block_count;
1570 if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1571 tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1572 len = tvp->u.buffer.len;
1573 break;
1574 default:
1575 dev_dbg(fe->dvb->device,
1576 "%s: FE property %d doesn't exist\n",
1577 __func__, tvp->cmd);
1578 return -EINVAL;
1579 }
1580
1581 if (len < 1)
1582 len = 1;
1583
1584 dev_dbg(fe->dvb->device,
1585 "%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1586 __func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1587 tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1588
1589 return 0;
1590 }
1591
1592 static int dtv_set_frontend(struct dvb_frontend *fe);
1593
is_dvbv3_delsys(u32 delsys)1594 static bool is_dvbv3_delsys(u32 delsys)
1595 {
1596 return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1597 (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1598 }
1599
1600 /**
1601 * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1602 * @fe: struct frontend;
1603 * @delsys: DVBv5 type that will be used for emulation
1604 *
1605 * Provides emulation for delivery systems that are compatible with the old
1606 * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1607 * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1608 * parameters are compatible with DVB-S spec.
1609 */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1610 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1611 {
1612 int i;
1613 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1614
1615 c->delivery_system = delsys;
1616
1617 /*
1618 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1619 */
1620 if (c->delivery_system == SYS_ISDBT) {
1621 dev_dbg(fe->dvb->device,
1622 "%s: Using defaults for SYS_ISDBT\n",
1623 __func__);
1624
1625 if (!c->bandwidth_hz)
1626 c->bandwidth_hz = 6000000;
1627
1628 c->isdbt_partial_reception = 0;
1629 c->isdbt_sb_mode = 0;
1630 c->isdbt_sb_subchannel = 0;
1631 c->isdbt_sb_segment_idx = 0;
1632 c->isdbt_sb_segment_count = 0;
1633 c->isdbt_layer_enabled = 7;
1634 for (i = 0; i < 3; i++) {
1635 c->layer[i].fec = FEC_AUTO;
1636 c->layer[i].modulation = QAM_AUTO;
1637 c->layer[i].interleaving = 0;
1638 c->layer[i].segment_count = 0;
1639 }
1640 }
1641 dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1642 __func__, c->delivery_system);
1643
1644 return 0;
1645 }
1646
1647 /**
1648 * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1649 * @fe: frontend struct
1650 * @desired_system: delivery system requested by the user
1651 *
1652 * A DVBv5 call know what's the desired system it wants. So, set it.
1653 *
1654 * There are, however, a few known issues with early DVBv5 applications that
1655 * are also handled by this logic:
1656 *
1657 * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1658 * This is an API violation, but, as we don't want to break userspace,
1659 * convert it to the first supported delivery system.
1660 * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1661 * example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1662 * ISDB-T provided backward compat with DVB-T.
1663 */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1664 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1665 u32 desired_system)
1666 {
1667 int ncaps;
1668 u32 delsys = SYS_UNDEFINED;
1669 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1670 enum dvbv3_emulation_type type;
1671
1672 /*
1673 * It was reported that some old DVBv5 applications were
1674 * filling delivery_system with SYS_UNDEFINED. If this happens,
1675 * assume that the application wants to use the first supported
1676 * delivery system.
1677 */
1678 if (desired_system == SYS_UNDEFINED)
1679 desired_system = fe->ops.delsys[0];
1680
1681 /*
1682 * This is a DVBv5 call. So, it likely knows the supported
1683 * delivery systems. So, check if the desired delivery system is
1684 * supported
1685 */
1686 ncaps = 0;
1687 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1688 if (fe->ops.delsys[ncaps] == desired_system) {
1689 c->delivery_system = desired_system;
1690 dev_dbg(fe->dvb->device,
1691 "%s: Changing delivery system to %d\n",
1692 __func__, desired_system);
1693 return 0;
1694 }
1695 ncaps++;
1696 }
1697
1698 /*
1699 * The requested delivery system isn't supported. Maybe userspace
1700 * is requesting a DVBv3 compatible delivery system.
1701 *
1702 * The emulation only works if the desired system is one of the
1703 * delivery systems supported by DVBv3 API
1704 */
1705 if (!is_dvbv3_delsys(desired_system)) {
1706 dev_dbg(fe->dvb->device,
1707 "%s: Delivery system %d not supported.\n",
1708 __func__, desired_system);
1709 return -EINVAL;
1710 }
1711
1712 type = dvbv3_type(desired_system);
1713
1714 /*
1715 * Get the last non-DVBv3 delivery system that has the same type
1716 * of the desired system
1717 */
1718 ncaps = 0;
1719 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1720 if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1721 delsys = fe->ops.delsys[ncaps];
1722 ncaps++;
1723 }
1724
1725 /* There's nothing compatible with the desired delivery system */
1726 if (delsys == SYS_UNDEFINED) {
1727 dev_dbg(fe->dvb->device,
1728 "%s: Delivery system %d not supported on emulation mode.\n",
1729 __func__, desired_system);
1730 return -EINVAL;
1731 }
1732
1733 dev_dbg(fe->dvb->device,
1734 "%s: Using delivery system %d emulated as if it were %d\n",
1735 __func__, delsys, desired_system);
1736
1737 return emulate_delivery_system(fe, desired_system);
1738 }
1739
1740 /**
1741 * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1742 * @fe: frontend struct
1743 *
1744 * A DVBv3 call doesn't know what's the desired system it wants. It also
1745 * doesn't allow to switch between different types. Due to that, userspace
1746 * should use DVBv5 instead.
1747 * However, in order to avoid breaking userspace API, limited backward
1748 * compatibility support is provided.
1749 *
1750 * There are some delivery systems that are incompatible with DVBv3 calls.
1751 *
1752 * This routine should work fine for frontends that support just one delivery
1753 * system.
1754 *
1755 * For frontends that support multiple frontends:
1756 * 1) It defaults to use the first supported delivery system. There's an
1757 * userspace application that allows changing it at runtime;
1758 *
1759 * 2) If the current delivery system is not compatible with DVBv3, it gets
1760 * the first one that it is compatible.
1761 *
1762 * NOTE: in order for this to work with applications like Kaffeine that
1763 * uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1764 * DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1765 * SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1766 * to DVB-S.
1767 */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1768 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1769 {
1770 int ncaps;
1771 u32 delsys = SYS_UNDEFINED;
1772 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1773
1774 /* If not set yet, defaults to the first supported delivery system */
1775 if (c->delivery_system == SYS_UNDEFINED)
1776 c->delivery_system = fe->ops.delsys[0];
1777
1778 /*
1779 * Trivial case: just use the current one, if it already a DVBv3
1780 * delivery system
1781 */
1782 if (is_dvbv3_delsys(c->delivery_system)) {
1783 dev_dbg(fe->dvb->device,
1784 "%s: Using delivery system to %d\n",
1785 __func__, c->delivery_system);
1786 return 0;
1787 }
1788
1789 /*
1790 * Seek for the first delivery system that it is compatible with a
1791 * DVBv3 standard
1792 */
1793 ncaps = 0;
1794 while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1795 if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1796 delsys = fe->ops.delsys[ncaps];
1797 break;
1798 }
1799 ncaps++;
1800 }
1801 if (delsys == SYS_UNDEFINED) {
1802 dev_dbg(fe->dvb->device,
1803 "%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1804 __func__);
1805 return -EINVAL;
1806 }
1807 return emulate_delivery_system(fe, delsys);
1808 }
1809
prepare_tuning_algo_parameters(struct dvb_frontend * fe)1810 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1811 {
1812 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1813 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1814 struct dvb_frontend_tune_settings fetunesettings = { 0 };
1815
1816 /* get frontend-specific tuning settings */
1817 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1818 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1819 fepriv->max_drift = fetunesettings.max_drift;
1820 fepriv->step_size = fetunesettings.step_size;
1821 } else {
1822 /* default values */
1823 switch (c->delivery_system) {
1824 case SYS_DVBS:
1825 case SYS_DVBS2:
1826 case SYS_ISDBS:
1827 case SYS_TURBO:
1828 case SYS_DVBC_ANNEX_A:
1829 case SYS_DVBC_ANNEX_C:
1830 fepriv->min_delay = HZ / 20;
1831 fepriv->step_size = c->symbol_rate / 16000;
1832 fepriv->max_drift = c->symbol_rate / 2000;
1833 break;
1834 case SYS_DVBT:
1835 case SYS_DVBT2:
1836 case SYS_ISDBT:
1837 case SYS_DTMB:
1838 fepriv->min_delay = HZ / 20;
1839 fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1840 fepriv->max_drift = fepriv->step_size + 1;
1841 break;
1842 default:
1843 /*
1844 * FIXME: This sounds wrong! if freqency_stepsize is
1845 * defined by the frontend, why not use it???
1846 */
1847 fepriv->min_delay = HZ / 20;
1848 fepriv->step_size = 0; /* no zigzag */
1849 fepriv->max_drift = 0;
1850 break;
1851 }
1852 }
1853 if (dvb_override_tune_delay > 0)
1854 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1855 }
1856
1857 /**
1858 * dtv_property_process_set - Sets a single DTV property
1859 * @fe: Pointer to &struct dvb_frontend
1860 * @file: Pointer to &struct file
1861 * @cmd: Digital TV command
1862 * @data: An unsigned 32-bits number
1863 *
1864 * This routine assigns the property
1865 * value to the corresponding member of
1866 * &struct dtv_frontend_properties
1867 *
1868 * Returns:
1869 * Zero on success, negative errno on failure.
1870 */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1871 static int dtv_property_process_set(struct dvb_frontend *fe,
1872 struct file *file,
1873 u32 cmd, u32 data)
1874 {
1875 int r = 0;
1876 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1877
1878 /** Dump DTV command name and value*/
1879 if (!cmd || cmd > DTV_MAX_COMMAND)
1880 dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1881 __func__, cmd);
1882 else
1883 dev_dbg(fe->dvb->device,
1884 "%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1885 __func__, cmd, dtv_cmd_name(cmd), data);
1886 switch (cmd) {
1887 case DTV_CLEAR:
1888 /*
1889 * Reset a cache of data specific to the frontend here. This does
1890 * not effect hardware.
1891 */
1892 dvb_frontend_clear_cache(fe);
1893 break;
1894 case DTV_TUNE:
1895 /*
1896 * Use the cached Digital TV properties to tune the
1897 * frontend
1898 */
1899 dev_dbg(fe->dvb->device,
1900 "%s: Setting the frontend from property cache\n",
1901 __func__);
1902
1903 r = dtv_set_frontend(fe);
1904 break;
1905 case DTV_FREQUENCY:
1906 c->frequency = data;
1907 break;
1908 case DTV_MODULATION:
1909 c->modulation = data;
1910 break;
1911 case DTV_BANDWIDTH_HZ:
1912 c->bandwidth_hz = data;
1913 break;
1914 case DTV_INVERSION:
1915 c->inversion = data;
1916 break;
1917 case DTV_SYMBOL_RATE:
1918 c->symbol_rate = data;
1919 break;
1920 case DTV_INNER_FEC:
1921 c->fec_inner = data;
1922 break;
1923 case DTV_PILOT:
1924 c->pilot = data;
1925 break;
1926 case DTV_ROLLOFF:
1927 c->rolloff = data;
1928 break;
1929 case DTV_DELIVERY_SYSTEM:
1930 r = dvbv5_set_delivery_system(fe, data);
1931 break;
1932 case DTV_VOLTAGE:
1933 c->voltage = data;
1934 r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1935 (void *)c->voltage);
1936 break;
1937 case DTV_TONE:
1938 c->sectone = data;
1939 r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1940 (void *)c->sectone);
1941 break;
1942 case DTV_CODE_RATE_HP:
1943 c->code_rate_HP = data;
1944 break;
1945 case DTV_CODE_RATE_LP:
1946 c->code_rate_LP = data;
1947 break;
1948 case DTV_GUARD_INTERVAL:
1949 c->guard_interval = data;
1950 break;
1951 case DTV_TRANSMISSION_MODE:
1952 c->transmission_mode = data;
1953 break;
1954 case DTV_HIERARCHY:
1955 c->hierarchy = data;
1956 break;
1957 case DTV_INTERLEAVING:
1958 c->interleaving = data;
1959 break;
1960
1961 /* ISDB-T Support here */
1962 case DTV_ISDBT_PARTIAL_RECEPTION:
1963 c->isdbt_partial_reception = data;
1964 break;
1965 case DTV_ISDBT_SOUND_BROADCASTING:
1966 c->isdbt_sb_mode = data;
1967 break;
1968 case DTV_ISDBT_SB_SUBCHANNEL_ID:
1969 c->isdbt_sb_subchannel = data;
1970 break;
1971 case DTV_ISDBT_SB_SEGMENT_IDX:
1972 c->isdbt_sb_segment_idx = data;
1973 break;
1974 case DTV_ISDBT_SB_SEGMENT_COUNT:
1975 c->isdbt_sb_segment_count = data;
1976 break;
1977 case DTV_ISDBT_LAYER_ENABLED:
1978 c->isdbt_layer_enabled = data;
1979 break;
1980 case DTV_ISDBT_LAYERA_FEC:
1981 c->layer[0].fec = data;
1982 break;
1983 case DTV_ISDBT_LAYERA_MODULATION:
1984 c->layer[0].modulation = data;
1985 break;
1986 case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1987 c->layer[0].segment_count = data;
1988 break;
1989 case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1990 c->layer[0].interleaving = data;
1991 break;
1992 case DTV_ISDBT_LAYERB_FEC:
1993 c->layer[1].fec = data;
1994 break;
1995 case DTV_ISDBT_LAYERB_MODULATION:
1996 c->layer[1].modulation = data;
1997 break;
1998 case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1999 c->layer[1].segment_count = data;
2000 break;
2001 case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2002 c->layer[1].interleaving = data;
2003 break;
2004 case DTV_ISDBT_LAYERC_FEC:
2005 c->layer[2].fec = data;
2006 break;
2007 case DTV_ISDBT_LAYERC_MODULATION:
2008 c->layer[2].modulation = data;
2009 break;
2010 case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2011 c->layer[2].segment_count = data;
2012 break;
2013 case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2014 c->layer[2].interleaving = data;
2015 break;
2016
2017 /* Multistream support */
2018 case DTV_STREAM_ID:
2019 case DTV_DVBT2_PLP_ID_LEGACY:
2020 c->stream_id = data;
2021 break;
2022
2023 /* Physical layer scrambling support */
2024 case DTV_SCRAMBLING_SEQUENCE_INDEX:
2025 c->scrambling_sequence_index = data;
2026 break;
2027
2028 /* ATSC-MH */
2029 case DTV_ATSCMH_PARADE_ID:
2030 fe->dtv_property_cache.atscmh_parade_id = data;
2031 break;
2032 case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2033 fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2034 break;
2035
2036 case DTV_LNA:
2037 c->lna = data;
2038 if (fe->ops.set_lna)
2039 r = fe->ops.set_lna(fe);
2040 if (r < 0)
2041 c->lna = LNA_AUTO;
2042 break;
2043
2044 default:
2045 return -EINVAL;
2046 }
2047
2048 return r;
2049 }
2050
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)2051 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2052 void *parg)
2053 {
2054 struct dvb_device *dvbdev = file->private_data;
2055 struct dvb_frontend *fe = dvbdev->priv;
2056 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2057 int err;
2058
2059 dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2060 if (down_interruptible(&fepriv->sem))
2061 return -ERESTARTSYS;
2062
2063 if (fe->exit != DVB_FE_NO_EXIT) {
2064 up(&fepriv->sem);
2065 return -ENODEV;
2066 }
2067
2068 /*
2069 * If the frontend is opened in read-only mode, only the ioctls
2070 * that don't interfere with the tune logic should be accepted.
2071 * That allows an external application to monitor the DVB QoS and
2072 * statistics parameters.
2073 *
2074 * That matches all _IOR() ioctls, except for two special cases:
2075 * - FE_GET_EVENT is part of the tuning logic on a DVB application;
2076 * - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2077 * setup
2078 * So, those two ioctls should also return -EPERM, as otherwise
2079 * reading from them would interfere with a DVB tune application
2080 */
2081 if ((file->f_flags & O_ACCMODE) == O_RDONLY
2082 && (_IOC_DIR(cmd) != _IOC_READ
2083 || cmd == FE_GET_EVENT
2084 || cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2085 up(&fepriv->sem);
2086 return -EPERM;
2087 }
2088
2089 err = dvb_frontend_handle_ioctl(file, cmd, parg);
2090
2091 up(&fepriv->sem);
2092 return err;
2093 }
2094
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2095 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2096 unsigned long arg)
2097 {
2098 struct dvb_device *dvbdev = file->private_data;
2099
2100 if (!dvbdev)
2101 return -ENODEV;
2102
2103 return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2104 }
2105
2106 #ifdef CONFIG_COMPAT
2107 struct compat_dtv_property {
2108 __u32 cmd;
2109 __u32 reserved[3];
2110 union {
2111 __u32 data;
2112 struct dtv_fe_stats st;
2113 struct {
2114 __u8 data[32];
2115 __u32 len;
2116 __u32 reserved1[3];
2117 compat_uptr_t reserved2;
2118 } buffer;
2119 } u;
2120 int result;
2121 } __attribute__ ((packed));
2122
2123 struct compat_dtv_properties {
2124 __u32 num;
2125 compat_uptr_t props;
2126 };
2127
2128 #define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties)
2129 #define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties)
2130
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2131 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2132 unsigned long arg)
2133 {
2134 struct dvb_device *dvbdev = file->private_data;
2135 struct dvb_frontend *fe = dvbdev->priv;
2136 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2137 int i, err = 0;
2138
2139 if (cmd == COMPAT_FE_SET_PROPERTY) {
2140 struct compat_dtv_properties prop, *tvps = NULL;
2141 struct compat_dtv_property *tvp = NULL;
2142
2143 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2144 return -EFAULT;
2145
2146 tvps = ∝
2147
2148 /*
2149 * Put an arbitrary limit on the number of messages that can
2150 * be sent at once
2151 */
2152 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2153 return -EINVAL;
2154
2155 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2156 if (IS_ERR(tvp))
2157 return PTR_ERR(tvp);
2158
2159 for (i = 0; i < tvps->num; i++) {
2160 err = dtv_property_process_set(fe, file,
2161 (tvp + i)->cmd,
2162 (tvp + i)->u.data);
2163 if (err < 0) {
2164 kfree(tvp);
2165 return err;
2166 }
2167 }
2168 kfree(tvp);
2169 } else if (cmd == COMPAT_FE_GET_PROPERTY) {
2170 struct compat_dtv_properties prop, *tvps = NULL;
2171 struct compat_dtv_property *tvp = NULL;
2172 struct dtv_frontend_properties getp = fe->dtv_property_cache;
2173
2174 if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2175 return -EFAULT;
2176
2177 tvps = ∝
2178
2179 /*
2180 * Put an arbitrary limit on the number of messages that can
2181 * be sent at once
2182 */
2183 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2184 return -EINVAL;
2185
2186 tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2187 if (IS_ERR(tvp))
2188 return PTR_ERR(tvp);
2189
2190 /*
2191 * Let's use our own copy of property cache, in order to
2192 * avoid mangling with DTV zigzag logic, as drivers might
2193 * return crap, if they don't check if the data is available
2194 * before updating the properties cache.
2195 */
2196 if (fepriv->state != FESTATE_IDLE) {
2197 err = dtv_get_frontend(fe, &getp, NULL);
2198 if (err < 0) {
2199 kfree(tvp);
2200 return err;
2201 }
2202 }
2203 for (i = 0; i < tvps->num; i++) {
2204 err = dtv_property_process_get(
2205 fe, &getp, (struct dtv_property *)(tvp + i), file);
2206 if (err < 0) {
2207 kfree(tvp);
2208 return err;
2209 }
2210 }
2211
2212 if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2213 tvps->num * sizeof(struct compat_dtv_property))) {
2214 kfree(tvp);
2215 return -EFAULT;
2216 }
2217 kfree(tvp);
2218 }
2219
2220 return err;
2221 }
2222
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2223 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2224 unsigned long arg)
2225 {
2226 struct dvb_device *dvbdev = file->private_data;
2227 struct dvb_frontend *fe = dvbdev->priv;
2228 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2229 int err;
2230
2231 if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2232 if (down_interruptible(&fepriv->sem))
2233 return -ERESTARTSYS;
2234
2235 err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2236
2237 up(&fepriv->sem);
2238 return err;
2239 }
2240
2241 return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2242 }
2243 #endif
2244
dtv_set_frontend(struct dvb_frontend * fe)2245 static int dtv_set_frontend(struct dvb_frontend *fe)
2246 {
2247 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2248 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2249 u32 rolloff = 0;
2250
2251 if (dvb_frontend_check_parameters(fe) < 0)
2252 return -EINVAL;
2253
2254 /*
2255 * Initialize output parameters to match the values given by
2256 * the user. FE_SET_FRONTEND triggers an initial frontend event
2257 * with status = 0, which copies output parameters to userspace.
2258 */
2259 dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2260
2261 /*
2262 * Be sure that the bandwidth will be filled for all
2263 * non-satellite systems, as tuners need to know what
2264 * low pass/Nyquist half filter should be applied, in
2265 * order to avoid inter-channel noise.
2266 *
2267 * ISDB-T and DVB-T/T2 already sets bandwidth.
2268 * ATSC and DVB-C don't set, so, the core should fill it.
2269 *
2270 * On DVB-C Annex A and C, the bandwidth is a function of
2271 * the roll-off and symbol rate. Annex B defines different
2272 * roll-off factors depending on the modulation. Fortunately,
2273 * Annex B is only used with 6MHz, so there's no need to
2274 * calculate it.
2275 *
2276 * While not officially supported, a side effect of handling it at
2277 * the cache level is that a program could retrieve the bandwidth
2278 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2279 */
2280 switch (c->delivery_system) {
2281 case SYS_ATSC:
2282 case SYS_DVBC_ANNEX_B:
2283 c->bandwidth_hz = 6000000;
2284 break;
2285 case SYS_DVBC_ANNEX_A:
2286 rolloff = 115;
2287 break;
2288 case SYS_DVBC_ANNEX_C:
2289 rolloff = 113;
2290 break;
2291 case SYS_DVBS:
2292 case SYS_TURBO:
2293 case SYS_ISDBS:
2294 rolloff = 135;
2295 break;
2296 case SYS_DVBS2:
2297 switch (c->rolloff) {
2298 case ROLLOFF_20:
2299 rolloff = 120;
2300 break;
2301 case ROLLOFF_25:
2302 rolloff = 125;
2303 break;
2304 default:
2305 case ROLLOFF_35:
2306 rolloff = 135;
2307 }
2308 break;
2309 default:
2310 break;
2311 }
2312 if (rolloff)
2313 c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2314
2315 /* force auto frequency inversion if requested */
2316 if (dvb_force_auto_inversion)
2317 c->inversion = INVERSION_AUTO;
2318
2319 /*
2320 * without hierarchical coding code_rate_LP is irrelevant,
2321 * so we tolerate the otherwise invalid FEC_NONE setting
2322 */
2323 if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2324 c->code_rate_LP = FEC_AUTO;
2325
2326 prepare_tuning_algo_parameters(fe);
2327
2328 fepriv->state = FESTATE_RETUNE;
2329
2330 /* Request the search algorithm to search */
2331 fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2332
2333 dvb_frontend_clear_events(fe);
2334 dvb_frontend_add_event(fe, 0);
2335 dvb_frontend_wakeup(fe);
2336 fepriv->status = 0;
2337
2338 return 0;
2339 }
2340
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2341 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2342 struct dtv_properties *tvps)
2343 {
2344 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2345 struct dtv_property *tvp = NULL;
2346 struct dtv_frontend_properties getp;
2347 int i, err;
2348
2349 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2350
2351 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2352 __func__, tvps->num);
2353 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2354 __func__, tvps->props);
2355
2356 /*
2357 * Put an arbitrary limit on the number of messages that can
2358 * be sent at once
2359 */
2360 if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2361 return -EINVAL;
2362
2363 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2364 if (IS_ERR(tvp))
2365 return PTR_ERR(tvp);
2366
2367 /*
2368 * Let's use our own copy of property cache, in order to
2369 * avoid mangling with DTV zigzag logic, as drivers might
2370 * return crap, if they don't check if the data is available
2371 * before updating the properties cache.
2372 */
2373 if (fepriv->state != FESTATE_IDLE) {
2374 err = dtv_get_frontend(fe, &getp, NULL);
2375 if (err < 0)
2376 goto out;
2377 }
2378 for (i = 0; i < tvps->num; i++) {
2379 err = dtv_property_process_get(fe, &getp,
2380 tvp + i, file);
2381 if (err < 0)
2382 goto out;
2383 }
2384
2385 if (copy_to_user((void __user *)tvps->props, tvp,
2386 tvps->num * sizeof(struct dtv_property))) {
2387 err = -EFAULT;
2388 goto out;
2389 }
2390
2391 err = 0;
2392 out:
2393 kfree(tvp);
2394 return err;
2395 }
2396
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2397 static int dvb_get_frontend(struct dvb_frontend *fe,
2398 struct dvb_frontend_parameters *p_out)
2399 {
2400 struct dtv_frontend_properties getp;
2401
2402 /*
2403 * Let's use our own copy of property cache, in order to
2404 * avoid mangling with DTV zigzag logic, as drivers might
2405 * return crap, if they don't check if the data is available
2406 * before updating the properties cache.
2407 */
2408 memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2409
2410 return dtv_get_frontend(fe, &getp, p_out);
2411 }
2412
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2413 static int dvb_frontend_handle_ioctl(struct file *file,
2414 unsigned int cmd, void *parg)
2415 {
2416 struct dvb_device *dvbdev = file->private_data;
2417 struct dvb_frontend *fe = dvbdev->priv;
2418 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2419 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2420 int i, err = -ENOTSUPP;
2421
2422 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2423
2424 switch (cmd) {
2425 case FE_SET_PROPERTY: {
2426 struct dtv_properties *tvps = parg;
2427 struct dtv_property *tvp = NULL;
2428
2429 dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2430 __func__, tvps->num);
2431 dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2432 __func__, tvps->props);
2433
2434 /*
2435 * Put an arbitrary limit on the number of messages that can
2436 * be sent at once
2437 */
2438 if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2439 return -EINVAL;
2440
2441 tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2442 if (IS_ERR(tvp))
2443 return PTR_ERR(tvp);
2444
2445 for (i = 0; i < tvps->num; i++) {
2446 err = dtv_property_process_set(fe, file,
2447 (tvp + i)->cmd,
2448 (tvp + i)->u.data);
2449 if (err < 0) {
2450 kfree(tvp);
2451 return err;
2452 }
2453 }
2454 kfree(tvp);
2455 err = 0;
2456 break;
2457 }
2458 case FE_GET_PROPERTY:
2459 err = dvb_get_property(fe, file, parg);
2460 break;
2461
2462 case FE_GET_INFO: {
2463 struct dvb_frontend_info *info = parg;
2464 memset(info, 0, sizeof(*info));
2465
2466 strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2467 info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2468 info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2469 info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2470 info->caps = fe->ops.info.caps;
2471 info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2472 dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2473 &info->frequency_max,
2474 &info->frequency_tolerance);
2475
2476 /*
2477 * Associate the 4 delivery systems supported by DVBv3
2478 * API with their DVBv5 counterpart. For the other standards,
2479 * use the closest type, assuming that it would hopefully
2480 * work with a DVBv3 application.
2481 * It should be noticed that, on multi-frontend devices with
2482 * different types (terrestrial and cable, for example),
2483 * a pure DVBv3 application won't be able to use all delivery
2484 * systems. Yet, changing the DVBv5 cache to the other delivery
2485 * system should be enough for making it work.
2486 */
2487 switch (dvbv3_type(c->delivery_system)) {
2488 case DVBV3_QPSK:
2489 info->type = FE_QPSK;
2490 break;
2491 case DVBV3_ATSC:
2492 info->type = FE_ATSC;
2493 break;
2494 case DVBV3_QAM:
2495 info->type = FE_QAM;
2496 break;
2497 case DVBV3_OFDM:
2498 info->type = FE_OFDM;
2499 break;
2500 default:
2501 dev_err(fe->dvb->device,
2502 "%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2503 __func__, c->delivery_system);
2504 info->type = FE_OFDM;
2505 }
2506 dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2507 __func__, c->delivery_system, info->type);
2508
2509 /* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2510 if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2511 info->caps |= FE_CAN_INVERSION_AUTO;
2512 err = 0;
2513 break;
2514 }
2515
2516 case FE_READ_STATUS: {
2517 enum fe_status *status = parg;
2518
2519 /* if retune was requested but hasn't occurred yet, prevent
2520 * that user get signal state from previous tuning */
2521 if (fepriv->state == FESTATE_RETUNE ||
2522 fepriv->state == FESTATE_ERROR) {
2523 err = 0;
2524 *status = 0;
2525 break;
2526 }
2527
2528 if (fe->ops.read_status)
2529 err = fe->ops.read_status(fe, status);
2530 break;
2531 }
2532
2533 case FE_DISEQC_RESET_OVERLOAD:
2534 if (fe->ops.diseqc_reset_overload) {
2535 err = fe->ops.diseqc_reset_overload(fe);
2536 fepriv->state = FESTATE_DISEQC;
2537 fepriv->status = 0;
2538 }
2539 break;
2540
2541 case FE_DISEQC_SEND_MASTER_CMD:
2542 if (fe->ops.diseqc_send_master_cmd) {
2543 struct dvb_diseqc_master_cmd *cmd = parg;
2544
2545 if (cmd->msg_len > sizeof(cmd->msg)) {
2546 err = -EINVAL;
2547 break;
2548 }
2549 err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2550 fepriv->state = FESTATE_DISEQC;
2551 fepriv->status = 0;
2552 }
2553 break;
2554
2555 case FE_DISEQC_SEND_BURST:
2556 if (fe->ops.diseqc_send_burst) {
2557 err = fe->ops.diseqc_send_burst(fe, (long)parg);
2558 fepriv->state = FESTATE_DISEQC;
2559 fepriv->status = 0;
2560 }
2561 break;
2562
2563 case FE_SET_TONE:
2564 if (fe->ops.set_tone) {
2565 fepriv->tone = (long)parg;
2566 err = fe->ops.set_tone(fe, fepriv->tone);
2567 fepriv->state = FESTATE_DISEQC;
2568 fepriv->status = 0;
2569 }
2570 break;
2571
2572 case FE_SET_VOLTAGE:
2573 if (fe->ops.set_voltage) {
2574 fepriv->voltage = (long)parg;
2575 err = fe->ops.set_voltage(fe, fepriv->voltage);
2576 fepriv->state = FESTATE_DISEQC;
2577 fepriv->status = 0;
2578 }
2579 break;
2580
2581 case FE_DISEQC_RECV_SLAVE_REPLY:
2582 if (fe->ops.diseqc_recv_slave_reply)
2583 err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2584 break;
2585
2586 case FE_ENABLE_HIGH_LNB_VOLTAGE:
2587 if (fe->ops.enable_high_lnb_voltage)
2588 err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2589 break;
2590
2591 case FE_SET_FRONTEND_TUNE_MODE:
2592 fepriv->tune_mode_flags = (unsigned long)parg;
2593 err = 0;
2594 break;
2595 /* DEPRECATED dish control ioctls */
2596
2597 case FE_DISHNETWORK_SEND_LEGACY_CMD:
2598 if (fe->ops.dishnetwork_send_legacy_command) {
2599 err = fe->ops.dishnetwork_send_legacy_command(fe,
2600 (unsigned long)parg);
2601 fepriv->state = FESTATE_DISEQC;
2602 fepriv->status = 0;
2603 } else if (fe->ops.set_voltage) {
2604 /*
2605 * NOTE: This is a fallback condition. Some frontends
2606 * (stv0299 for instance) take longer than 8msec to
2607 * respond to a set_voltage command. Those switches
2608 * need custom routines to switch properly. For all
2609 * other frontends, the following should work ok.
2610 * Dish network legacy switches (as used by Dish500)
2611 * are controlled by sending 9-bit command words
2612 * spaced 8msec apart.
2613 * the actual command word is switch/port dependent
2614 * so it is up to the userspace application to send
2615 * the right command.
2616 * The command must always start with a '0' after
2617 * initialization, so parg is 8 bits and does not
2618 * include the initialization or start bit
2619 */
2620 unsigned long swcmd = ((unsigned long)parg) << 1;
2621 ktime_t nexttime;
2622 ktime_t tv[10];
2623 int i;
2624 u8 last = 1;
2625
2626 if (dvb_frontend_debug)
2627 dprintk("switch command: 0x%04lx\n",
2628 swcmd);
2629 nexttime = ktime_get_boottime();
2630 if (dvb_frontend_debug)
2631 tv[0] = nexttime;
2632 /* before sending a command, initialize by sending
2633 * a 32ms 18V to the switch
2634 */
2635 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2636 dvb_frontend_sleep_until(&nexttime, 32000);
2637
2638 for (i = 0; i < 9; i++) {
2639 if (dvb_frontend_debug)
2640 tv[i + 1] = ktime_get_boottime();
2641 if ((swcmd & 0x01) != last) {
2642 /* set voltage to (last ? 13V : 18V) */
2643 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2644 last = (last) ? 0 : 1;
2645 }
2646 swcmd = swcmd >> 1;
2647 if (i != 8)
2648 dvb_frontend_sleep_until(&nexttime, 8000);
2649 }
2650 if (dvb_frontend_debug) {
2651 dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2652 fe->dvb->num);
2653 for (i = 1; i < 10; i++)
2654 pr_info("%d: %d\n", i,
2655 (int)ktime_us_delta(tv[i], tv[i - 1]));
2656 }
2657 err = 0;
2658 fepriv->state = FESTATE_DISEQC;
2659 fepriv->status = 0;
2660 }
2661 break;
2662
2663 /* DEPRECATED statistics ioctls */
2664
2665 case FE_READ_BER:
2666 if (fe->ops.read_ber) {
2667 if (fepriv->thread)
2668 err = fe->ops.read_ber(fe, parg);
2669 else
2670 err = -EAGAIN;
2671 }
2672 break;
2673
2674 case FE_READ_SIGNAL_STRENGTH:
2675 if (fe->ops.read_signal_strength) {
2676 if (fepriv->thread)
2677 err = fe->ops.read_signal_strength(fe, parg);
2678 else
2679 err = -EAGAIN;
2680 }
2681 break;
2682
2683 case FE_READ_SNR:
2684 if (fe->ops.read_snr) {
2685 if (fepriv->thread)
2686 err = fe->ops.read_snr(fe, parg);
2687 else
2688 err = -EAGAIN;
2689 }
2690 break;
2691
2692 case FE_READ_UNCORRECTED_BLOCKS:
2693 if (fe->ops.read_ucblocks) {
2694 if (fepriv->thread)
2695 err = fe->ops.read_ucblocks(fe, parg);
2696 else
2697 err = -EAGAIN;
2698 }
2699 break;
2700
2701 /* DEPRECATED DVBv3 ioctls */
2702
2703 case FE_SET_FRONTEND:
2704 err = dvbv3_set_delivery_system(fe);
2705 if (err)
2706 break;
2707
2708 err = dtv_property_cache_sync(fe, c, parg);
2709 if (err)
2710 break;
2711 err = dtv_set_frontend(fe);
2712 break;
2713
2714 case FE_GET_EVENT:
2715 err = dvb_frontend_get_event(fe, parg, file->f_flags);
2716 break;
2717
2718 case FE_GET_FRONTEND:
2719 err = dvb_get_frontend(fe, parg);
2720 break;
2721
2722 default:
2723 return -ENOTSUPP;
2724 } /* switch */
2725
2726 return err;
2727 }
2728
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2729 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2730 {
2731 struct dvb_device *dvbdev = file->private_data;
2732 struct dvb_frontend *fe = dvbdev->priv;
2733 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2734
2735 dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2736
2737 poll_wait(file, &fepriv->events.wait_queue, wait);
2738
2739 if (fepriv->events.eventw != fepriv->events.eventr)
2740 return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2741
2742 return 0;
2743 }
2744
dvb_frontend_open(struct inode * inode,struct file * file)2745 static int dvb_frontend_open(struct inode *inode, struct file *file)
2746 {
2747 struct dvb_device *dvbdev = file->private_data;
2748 struct dvb_frontend *fe = dvbdev->priv;
2749 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2750 struct dvb_adapter *adapter = fe->dvb;
2751 int ret;
2752
2753 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2754 if (fe->exit == DVB_FE_DEVICE_REMOVED)
2755 return -ENODEV;
2756
2757 if (adapter->mfe_shared) {
2758 mutex_lock(&adapter->mfe_lock);
2759
2760 if (!adapter->mfe_dvbdev)
2761 adapter->mfe_dvbdev = dvbdev;
2762
2763 else if (adapter->mfe_dvbdev != dvbdev) {
2764 struct dvb_device
2765 *mfedev = adapter->mfe_dvbdev;
2766 struct dvb_frontend
2767 *mfe = mfedev->priv;
2768 struct dvb_frontend_private
2769 *mfepriv = mfe->frontend_priv;
2770 int mferetry = (dvb_mfe_wait_time << 1);
2771
2772 mutex_unlock(&adapter->mfe_lock);
2773 while (mferetry-- && (mfedev->users != -1 ||
2774 mfepriv->thread)) {
2775 if (msleep_interruptible(500)) {
2776 if (signal_pending(current))
2777 return -EINTR;
2778 }
2779 }
2780
2781 mutex_lock(&adapter->mfe_lock);
2782 if (adapter->mfe_dvbdev != dvbdev) {
2783 mfedev = adapter->mfe_dvbdev;
2784 mfe = mfedev->priv;
2785 mfepriv = mfe->frontend_priv;
2786 if (mfedev->users != -1 ||
2787 mfepriv->thread) {
2788 mutex_unlock(&adapter->mfe_lock);
2789 return -EBUSY;
2790 }
2791 adapter->mfe_dvbdev = dvbdev;
2792 }
2793 }
2794 }
2795
2796 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2797 if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2798 goto err0;
2799
2800 /* If we took control of the bus, we need to force
2801 reinitialization. This is because many ts_bus_ctrl()
2802 functions strobe the RESET pin on the demod, and if the
2803 frontend thread already exists then the dvb_init() routine
2804 won't get called (which is what usually does initial
2805 register configuration). */
2806 fepriv->reinitialise = 1;
2807 }
2808
2809 if ((ret = dvb_generic_open(inode, file)) < 0)
2810 goto err1;
2811
2812 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2813 /* normal tune mode when opened R/W */
2814 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2815 fepriv->tone = -1;
2816 fepriv->voltage = -1;
2817
2818 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2819 mutex_lock(&fe->dvb->mdev_lock);
2820 if (fe->dvb->mdev) {
2821 mutex_lock(&fe->dvb->mdev->graph_mutex);
2822 if (fe->dvb->mdev->enable_source)
2823 ret = fe->dvb->mdev->enable_source(
2824 dvbdev->entity,
2825 &fepriv->pipe);
2826 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2827 if (ret) {
2828 mutex_unlock(&fe->dvb->mdev_lock);
2829 dev_err(fe->dvb->device,
2830 "Tuner is busy. Error %d\n", ret);
2831 goto err2;
2832 }
2833 }
2834 mutex_unlock(&fe->dvb->mdev_lock);
2835 #endif
2836 ret = dvb_frontend_start(fe);
2837 if (ret)
2838 goto err3;
2839
2840 /* empty event queue */
2841 fepriv->events.eventr = fepriv->events.eventw = 0;
2842 }
2843
2844 dvb_frontend_get(fe);
2845
2846 if (adapter->mfe_shared)
2847 mutex_unlock(&adapter->mfe_lock);
2848 return ret;
2849
2850 err3:
2851 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2852 mutex_lock(&fe->dvb->mdev_lock);
2853 if (fe->dvb->mdev) {
2854 mutex_lock(&fe->dvb->mdev->graph_mutex);
2855 if (fe->dvb->mdev->disable_source)
2856 fe->dvb->mdev->disable_source(dvbdev->entity);
2857 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2858 }
2859 mutex_unlock(&fe->dvb->mdev_lock);
2860 err2:
2861 #endif
2862 dvb_generic_release(inode, file);
2863 err1:
2864 if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2865 fe->ops.ts_bus_ctrl(fe, 0);
2866 err0:
2867 if (adapter->mfe_shared)
2868 mutex_unlock(&adapter->mfe_lock);
2869 return ret;
2870 }
2871
dvb_frontend_release(struct inode * inode,struct file * file)2872 static int dvb_frontend_release(struct inode *inode, struct file *file)
2873 {
2874 struct dvb_device *dvbdev = file->private_data;
2875 struct dvb_frontend *fe = dvbdev->priv;
2876 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2877 int ret;
2878
2879 dev_dbg(fe->dvb->device, "%s:\n", __func__);
2880
2881 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2882 fepriv->release_jiffies = jiffies;
2883 mb();
2884 }
2885
2886 ret = dvb_generic_release(inode, file);
2887
2888 if (dvbdev->users == -1) {
2889 wake_up(&fepriv->wait_queue);
2890 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2891 mutex_lock(&fe->dvb->mdev_lock);
2892 if (fe->dvb->mdev) {
2893 mutex_lock(&fe->dvb->mdev->graph_mutex);
2894 if (fe->dvb->mdev->disable_source)
2895 fe->dvb->mdev->disable_source(dvbdev->entity);
2896 mutex_unlock(&fe->dvb->mdev->graph_mutex);
2897 }
2898 mutex_unlock(&fe->dvb->mdev_lock);
2899 #endif
2900 if (fe->exit != DVB_FE_NO_EXIT)
2901 wake_up(&dvbdev->wait_queue);
2902 if (fe->ops.ts_bus_ctrl)
2903 fe->ops.ts_bus_ctrl(fe, 0);
2904 }
2905
2906 dvb_frontend_put(fe);
2907
2908 return ret;
2909 }
2910
2911 static const struct file_operations dvb_frontend_fops = {
2912 .owner = THIS_MODULE,
2913 .unlocked_ioctl = dvb_frontend_ioctl,
2914 #ifdef CONFIG_COMPAT
2915 .compat_ioctl = dvb_frontend_compat_ioctl,
2916 #endif
2917 .poll = dvb_frontend_poll,
2918 .open = dvb_frontend_open,
2919 .release = dvb_frontend_release,
2920 .llseek = noop_llseek,
2921 };
2922
dvb_frontend_suspend(struct dvb_frontend * fe)2923 int dvb_frontend_suspend(struct dvb_frontend *fe)
2924 {
2925 int ret = 0;
2926
2927 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2928 fe->id);
2929
2930 if (fe->ops.tuner_ops.suspend)
2931 ret = fe->ops.tuner_ops.suspend(fe);
2932 else if (fe->ops.tuner_ops.sleep)
2933 ret = fe->ops.tuner_ops.sleep(fe);
2934
2935 if (fe->ops.suspend)
2936 ret = fe->ops.suspend(fe);
2937 else if (fe->ops.sleep)
2938 ret = fe->ops.sleep(fe);
2939
2940 return ret;
2941 }
2942 EXPORT_SYMBOL(dvb_frontend_suspend);
2943
dvb_frontend_resume(struct dvb_frontend * fe)2944 int dvb_frontend_resume(struct dvb_frontend *fe)
2945 {
2946 struct dvb_frontend_private *fepriv = fe->frontend_priv;
2947 int ret = 0;
2948
2949 dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2950 fe->id);
2951
2952 fe->exit = DVB_FE_DEVICE_RESUME;
2953 if (fe->ops.resume)
2954 ret = fe->ops.resume(fe);
2955 else if (fe->ops.init)
2956 ret = fe->ops.init(fe);
2957
2958 if (fe->ops.tuner_ops.resume)
2959 ret = fe->ops.tuner_ops.resume(fe);
2960 else if (fe->ops.tuner_ops.init)
2961 ret = fe->ops.tuner_ops.init(fe);
2962
2963 if (fe->ops.set_tone && fepriv->tone != -1)
2964 fe->ops.set_tone(fe, fepriv->tone);
2965 if (fe->ops.set_voltage && fepriv->voltage != -1)
2966 fe->ops.set_voltage(fe, fepriv->voltage);
2967
2968 fe->exit = DVB_FE_NO_EXIT;
2969 fepriv->state = FESTATE_RETUNE;
2970 dvb_frontend_wakeup(fe);
2971
2972 return ret;
2973 }
2974 EXPORT_SYMBOL(dvb_frontend_resume);
2975
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)2976 int dvb_register_frontend(struct dvb_adapter *dvb,
2977 struct dvb_frontend *fe)
2978 {
2979 struct dvb_frontend_private *fepriv;
2980 const struct dvb_device dvbdev_template = {
2981 .users = ~0,
2982 .writers = 1,
2983 .readers = (~0) - 1,
2984 .fops = &dvb_frontend_fops,
2985 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
2986 .name = fe->ops.info.name,
2987 #endif
2988 };
2989 int ret;
2990
2991 dev_dbg(dvb->device, "%s:\n", __func__);
2992
2993 if (mutex_lock_interruptible(&frontend_mutex))
2994 return -ERESTARTSYS;
2995
2996 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
2997 if (!fe->frontend_priv) {
2998 mutex_unlock(&frontend_mutex);
2999 return -ENOMEM;
3000 }
3001 fepriv = fe->frontend_priv;
3002
3003 kref_init(&fe->refcount);
3004
3005 /*
3006 * After initialization, there need to be two references: one
3007 * for dvb_unregister_frontend(), and another one for
3008 * dvb_frontend_detach().
3009 */
3010 dvb_frontend_get(fe);
3011
3012 sema_init(&fepriv->sem, 1);
3013 init_waitqueue_head(&fepriv->wait_queue);
3014 init_waitqueue_head(&fepriv->events.wait_queue);
3015 mutex_init(&fepriv->events.mtx);
3016 fe->dvb = dvb;
3017 fepriv->inversion = INVERSION_OFF;
3018
3019 dev_info(fe->dvb->device,
3020 "DVB: registering adapter %i frontend %i (%s)...\n",
3021 fe->dvb->num, fe->id, fe->ops.info.name);
3022
3023 ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3024 fe, DVB_DEVICE_FRONTEND, 0);
3025 if (ret) {
3026 dvb_frontend_put(fe);
3027 mutex_unlock(&frontend_mutex);
3028 return ret;
3029 }
3030
3031 /*
3032 * Initialize the cache to the proper values according with the
3033 * first supported delivery system (ops->delsys[0])
3034 */
3035
3036 fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3037 dvb_frontend_clear_cache(fe);
3038
3039 mutex_unlock(&frontend_mutex);
3040 return 0;
3041 }
3042 EXPORT_SYMBOL(dvb_register_frontend);
3043
dvb_unregister_frontend(struct dvb_frontend * fe)3044 int dvb_unregister_frontend(struct dvb_frontend *fe)
3045 {
3046 struct dvb_frontend_private *fepriv = fe->frontend_priv;
3047
3048 dev_dbg(fe->dvb->device, "%s:\n", __func__);
3049
3050 mutex_lock(&frontend_mutex);
3051 dvb_frontend_stop(fe);
3052 dvb_remove_device(fepriv->dvbdev);
3053
3054 /* fe is invalid now */
3055 mutex_unlock(&frontend_mutex);
3056 dvb_frontend_put(fe);
3057 return 0;
3058 }
3059 EXPORT_SYMBOL(dvb_unregister_frontend);
3060
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3061 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3062 void (*release)(struct dvb_frontend *fe))
3063 {
3064 if (release) {
3065 release(fe);
3066 #ifdef CONFIG_MEDIA_ATTACH
3067 dvb_detach(release);
3068 #endif
3069 }
3070 }
3071
dvb_frontend_detach(struct dvb_frontend * fe)3072 void dvb_frontend_detach(struct dvb_frontend *fe)
3073 {
3074 dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3075 dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3076 dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3077 dvb_frontend_put(fe);
3078 }
3079 EXPORT_SYMBOL(dvb_frontend_detach);
3080