1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * dvb_frontend.c: DVB frontend tuning interface/thread
4  *
5  * Copyright (C) 1999-2001 Ralph  Metzler
6  *			   Marcus Metzler
7  *			   Holger Waechtler
8  *				      for convergence integrated media GmbH
9  *
10  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11  */
12 
13 /* Enables DVBv3 compatibility bits at the headers */
14 #define __DVB_CORE__
15 
16 #define pr_fmt(fmt) "dvb_frontend: " fmt
17 
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/wait.h>
22 #include <linux/slab.h>
23 #include <linux/poll.h>
24 #include <linux/semaphore.h>
25 #include <linux/module.h>
26 #include <linux/nospec.h>
27 #include <linux/list.h>
28 #include <linux/freezer.h>
29 #include <linux/jiffies.h>
30 #include <linux/kthread.h>
31 #include <linux/ktime.h>
32 #include <linux/compat.h>
33 #include <asm/processor.h>
34 
35 #include <media/dvb_frontend.h>
36 #include <media/dvbdev.h>
37 #include <linux/dvb/version.h>
38 
39 static int dvb_frontend_debug;
40 static int dvb_shutdown_timeout;
41 static int dvb_force_auto_inversion;
42 static int dvb_override_tune_delay;
43 static int dvb_powerdown_on_sleep = 1;
44 static int dvb_mfe_wait_time = 5;
45 
46 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
47 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
48 module_param(dvb_shutdown_timeout, int, 0644);
49 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
50 module_param(dvb_force_auto_inversion, int, 0644);
51 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
52 module_param(dvb_override_tune_delay, int, 0644);
53 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
54 module_param(dvb_powerdown_on_sleep, int, 0644);
55 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
56 module_param(dvb_mfe_wait_time, int, 0644);
57 MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)");
58 
59 #define dprintk(fmt, arg...) \
60 	printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
61 
62 #define FESTATE_IDLE 1
63 #define FESTATE_RETUNE 2
64 #define FESTATE_TUNING_FAST 4
65 #define FESTATE_TUNING_SLOW 8
66 #define FESTATE_TUNED 16
67 #define FESTATE_ZIGZAG_FAST 32
68 #define FESTATE_ZIGZAG_SLOW 64
69 #define FESTATE_DISEQC 128
70 #define FESTATE_ERROR 256
71 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
72 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
73 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
74 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
75 
76 /*
77  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
78  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
79  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
80  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
81  * FESTATE_TUNED. The frontend has successfully locked on.
82  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
83  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
84  * FESTATE_DISEQC. A DISEQC command has just been issued.
85  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
86  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
87  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
88  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
89  */
90 
91 static DEFINE_MUTEX(frontend_mutex);
92 
93 struct dvb_frontend_private {
94 	/* thread/frontend values */
95 	struct dvb_device *dvbdev;
96 	struct dvb_frontend_parameters parameters_out;
97 	struct dvb_fe_events events;
98 	struct semaphore sem;
99 	struct list_head list_head;
100 	wait_queue_head_t wait_queue;
101 	struct task_struct *thread;
102 	unsigned long release_jiffies;
103 	unsigned int wakeup;
104 	enum fe_status status;
105 	unsigned long tune_mode_flags;
106 	unsigned int delay;
107 	unsigned int reinitialise;
108 	int tone;
109 	int voltage;
110 
111 	/* swzigzag values */
112 	unsigned int state;
113 	unsigned int bending;
114 	int lnb_drift;
115 	unsigned int inversion;
116 	unsigned int auto_step;
117 	unsigned int auto_sub_step;
118 	unsigned int started_auto_step;
119 	unsigned int min_delay;
120 	unsigned int max_drift;
121 	unsigned int step_size;
122 	int quality;
123 	unsigned int check_wrapped;
124 	enum dvbfe_search algo_status;
125 
126 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
127 	struct media_pipeline pipe;
128 #endif
129 };
130 
131 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
132 					void (*release)(struct dvb_frontend *fe));
133 
__dvb_frontend_free(struct dvb_frontend * fe)134 static void __dvb_frontend_free(struct dvb_frontend *fe)
135 {
136 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
137 
138 	if (fepriv)
139 		dvb_device_put(fepriv->dvbdev);
140 
141 	dvb_frontend_invoke_release(fe, fe->ops.release);
142 
143 	kfree(fepriv);
144 }
145 
dvb_frontend_free(struct kref * ref)146 static void dvb_frontend_free(struct kref *ref)
147 {
148 	struct dvb_frontend *fe =
149 		container_of(ref, struct dvb_frontend, refcount);
150 
151 	__dvb_frontend_free(fe);
152 }
153 
dvb_frontend_put(struct dvb_frontend * fe)154 static void dvb_frontend_put(struct dvb_frontend *fe)
155 {
156 	/* call detach before dropping the reference count */
157 	if (fe->ops.detach)
158 		fe->ops.detach(fe);
159 	/*
160 	 * Check if the frontend was registered, as otherwise
161 	 * kref was not initialized yet.
162 	 */
163 	if (fe->frontend_priv)
164 		kref_put(&fe->refcount, dvb_frontend_free);
165 	else
166 		__dvb_frontend_free(fe);
167 }
168 
dvb_frontend_get(struct dvb_frontend * fe)169 static void dvb_frontend_get(struct dvb_frontend *fe)
170 {
171 	kref_get(&fe->refcount);
172 }
173 
174 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
175 static int dtv_get_frontend(struct dvb_frontend *fe,
176 			    struct dtv_frontend_properties *c,
177 			    struct dvb_frontend_parameters *p_out);
178 static int
179 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
180 				const struct dtv_frontend_properties *c,
181 				struct dvb_frontend_parameters *p);
182 
has_get_frontend(struct dvb_frontend * fe)183 static bool has_get_frontend(struct dvb_frontend *fe)
184 {
185 	return fe->ops.get_frontend;
186 }
187 
188 /*
189  * Due to DVBv3 API calls, a delivery system should be mapped into one of
190  * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC),
191  * otherwise, a DVBv3 call will fail.
192  */
193 enum dvbv3_emulation_type {
194 	DVBV3_UNKNOWN,
195 	DVBV3_QPSK,
196 	DVBV3_QAM,
197 	DVBV3_OFDM,
198 	DVBV3_ATSC,
199 };
200 
dvbv3_type(u32 delivery_system)201 static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system)
202 {
203 	switch (delivery_system) {
204 	case SYS_DVBC_ANNEX_A:
205 	case SYS_DVBC_ANNEX_C:
206 		return DVBV3_QAM;
207 	case SYS_DVBS:
208 	case SYS_DVBS2:
209 	case SYS_TURBO:
210 	case SYS_ISDBS:
211 	case SYS_DSS:
212 		return DVBV3_QPSK;
213 	case SYS_DVBT:
214 	case SYS_DVBT2:
215 	case SYS_ISDBT:
216 	case SYS_DTMB:
217 		return DVBV3_OFDM;
218 	case SYS_ATSC:
219 	case SYS_ATSCMH:
220 	case SYS_DVBC_ANNEX_B:
221 		return DVBV3_ATSC;
222 	case SYS_UNDEFINED:
223 	case SYS_ISDBC:
224 	case SYS_DVBH:
225 	case SYS_DAB:
226 	default:
227 		/*
228 		 * Doesn't know how to emulate those types and/or
229 		 * there's no frontend driver from this type yet
230 		 * with some emulation code, so, we're not sure yet how
231 		 * to handle them, or they're not compatible with a DVBv3 call.
232 		 */
233 		return DVBV3_UNKNOWN;
234 	}
235 }
236 
dvb_frontend_add_event(struct dvb_frontend * fe,enum fe_status status)237 static void dvb_frontend_add_event(struct dvb_frontend *fe,
238 				   enum fe_status status)
239 {
240 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
241 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
242 	struct dvb_fe_events *events = &fepriv->events;
243 	struct dvb_frontend_event *e;
244 	int wp;
245 
246 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
247 
248 	if ((status & FE_HAS_LOCK) && has_get_frontend(fe))
249 		dtv_get_frontend(fe, c, &fepriv->parameters_out);
250 
251 	mutex_lock(&events->mtx);
252 
253 	wp = (events->eventw + 1) % MAX_EVENT;
254 	if (wp == events->eventr) {
255 		events->overflow = 1;
256 		events->eventr = (events->eventr + 1) % MAX_EVENT;
257 	}
258 
259 	e = &events->events[events->eventw];
260 	e->status = status;
261 	e->parameters = fepriv->parameters_out;
262 
263 	events->eventw = wp;
264 
265 	mutex_unlock(&events->mtx);
266 
267 	wake_up_interruptible(&events->wait_queue);
268 }
269 
dvb_frontend_test_event(struct dvb_frontend_private * fepriv,struct dvb_fe_events * events)270 static int dvb_frontend_test_event(struct dvb_frontend_private *fepriv,
271 				   struct dvb_fe_events *events)
272 {
273 	int ret;
274 
275 	up(&fepriv->sem);
276 	ret = events->eventw != events->eventr;
277 	down(&fepriv->sem);
278 
279 	return ret;
280 }
281 
dvb_frontend_get_event(struct dvb_frontend * fe,struct dvb_frontend_event * event,int flags)282 static int dvb_frontend_get_event(struct dvb_frontend *fe,
283 				  struct dvb_frontend_event *event, int flags)
284 {
285 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
286 	struct dvb_fe_events *events = &fepriv->events;
287 
288 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
289 
290 	if (events->overflow) {
291 		events->overflow = 0;
292 		return -EOVERFLOW;
293 	}
294 
295 	if (events->eventw == events->eventr) {
296 		struct wait_queue_entry wait;
297 		int ret = 0;
298 
299 		if (flags & O_NONBLOCK)
300 			return -EWOULDBLOCK;
301 
302 		init_waitqueue_entry(&wait, current);
303 		add_wait_queue(&events->wait_queue, &wait);
304 		while (!dvb_frontend_test_event(fepriv, events)) {
305 			wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
306 			if (signal_pending(current)) {
307 				ret = -ERESTARTSYS;
308 				break;
309 			}
310 		}
311 		remove_wait_queue(&events->wait_queue, &wait);
312 		if (ret < 0)
313 			return ret;
314 	}
315 
316 	mutex_lock(&events->mtx);
317 	*event = events->events[events->eventr];
318 	events->eventr = (events->eventr + 1) % MAX_EVENT;
319 	mutex_unlock(&events->mtx);
320 
321 	return 0;
322 }
323 
dvb_frontend_clear_events(struct dvb_frontend * fe)324 static void dvb_frontend_clear_events(struct dvb_frontend *fe)
325 {
326 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
327 	struct dvb_fe_events *events = &fepriv->events;
328 
329 	mutex_lock(&events->mtx);
330 	events->eventr = events->eventw;
331 	mutex_unlock(&events->mtx);
332 }
333 
dvb_frontend_init(struct dvb_frontend * fe)334 static void dvb_frontend_init(struct dvb_frontend *fe)
335 {
336 	dev_dbg(fe->dvb->device,
337 		"%s: initialising adapter %i frontend %i (%s)...\n",
338 		__func__, fe->dvb->num, fe->id, fe->ops.info.name);
339 
340 	if (fe->ops.init)
341 		fe->ops.init(fe);
342 	if (fe->ops.tuner_ops.init) {
343 		if (fe->ops.i2c_gate_ctrl)
344 			fe->ops.i2c_gate_ctrl(fe, 1);
345 		fe->ops.tuner_ops.init(fe);
346 		if (fe->ops.i2c_gate_ctrl)
347 			fe->ops.i2c_gate_ctrl(fe, 0);
348 	}
349 }
350 
dvb_frontend_reinitialise(struct dvb_frontend * fe)351 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
352 {
353 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
354 
355 	fepriv->reinitialise = 1;
356 	dvb_frontend_wakeup(fe);
357 }
358 EXPORT_SYMBOL(dvb_frontend_reinitialise);
359 
dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private * fepriv,int locked)360 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
361 {
362 	int q2;
363 	struct dvb_frontend *fe = fepriv->dvbdev->priv;
364 
365 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
366 
367 	if (locked)
368 		(fepriv->quality) = (fepriv->quality * 220 + 36 * 256) / 256;
369 	else
370 		(fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
371 
372 	q2 = fepriv->quality - 128;
373 	q2 *= q2;
374 
375 	fepriv->delay = fepriv->min_delay + q2 * HZ / (128 * 128);
376 }
377 
378 /**
379  * dvb_frontend_swzigzag_autotune - Performs automatic twiddling of frontend
380  *	parameters.
381  *
382  * @fe: The frontend concerned.
383  * @check_wrapped: Checks if an iteration has completed.
384  *		   DO NOT SET ON THE FIRST ATTEMPT.
385  *
386  * return: Number of complete iterations that have been performed.
387  */
dvb_frontend_swzigzag_autotune(struct dvb_frontend * fe,int check_wrapped)388 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
389 {
390 	int autoinversion;
391 	int ready = 0;
392 	int fe_set_err = 0;
393 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
394 	struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
395 	int original_inversion = c->inversion;
396 	u32 original_frequency = c->frequency;
397 
398 	/* are we using autoinversion? */
399 	autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
400 			 (c->inversion == INVERSION_AUTO));
401 
402 	/* setup parameters correctly */
403 	while (!ready) {
404 		/* calculate the lnb_drift */
405 		fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
406 
407 		/* wrap the auto_step if we've exceeded the maximum drift */
408 		if (fepriv->lnb_drift > fepriv->max_drift) {
409 			fepriv->auto_step = 0;
410 			fepriv->auto_sub_step = 0;
411 			fepriv->lnb_drift = 0;
412 		}
413 
414 		/* perform inversion and +/- zigzag */
415 		switch (fepriv->auto_sub_step) {
416 		case 0:
417 			/* try with the current inversion and current drift setting */
418 			ready = 1;
419 			break;
420 
421 		case 1:
422 			if (!autoinversion) break;
423 
424 			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
425 			ready = 1;
426 			break;
427 
428 		case 2:
429 			if (fepriv->lnb_drift == 0) break;
430 
431 			fepriv->lnb_drift = -fepriv->lnb_drift;
432 			ready = 1;
433 			break;
434 
435 		case 3:
436 			if (fepriv->lnb_drift == 0) break;
437 			if (!autoinversion) break;
438 
439 			fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
440 			fepriv->lnb_drift = -fepriv->lnb_drift;
441 			ready = 1;
442 			break;
443 
444 		default:
445 			fepriv->auto_step++;
446 			fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
447 			break;
448 		}
449 
450 		if (!ready) fepriv->auto_sub_step++;
451 	}
452 
453 	/* if this attempt would hit where we started, indicate a complete
454 	 * iteration has occurred */
455 	if ((fepriv->auto_step == fepriv->started_auto_step) &&
456 	    (fepriv->auto_sub_step == 0) && check_wrapped) {
457 		return 1;
458 	}
459 
460 	dev_dbg(fe->dvb->device,
461 		"%s: drift:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
462 		__func__, fepriv->lnb_drift, fepriv->inversion,
463 		fepriv->auto_step, fepriv->auto_sub_step,
464 		fepriv->started_auto_step);
465 
466 	/* set the frontend itself */
467 	c->frequency += fepriv->lnb_drift;
468 	if (autoinversion)
469 		c->inversion = fepriv->inversion;
470 	tmp = *c;
471 	if (fe->ops.set_frontend)
472 		fe_set_err = fe->ops.set_frontend(fe);
473 	*c = tmp;
474 	if (fe_set_err < 0) {
475 		fepriv->state = FESTATE_ERROR;
476 		return fe_set_err;
477 	}
478 
479 	c->frequency = original_frequency;
480 	c->inversion = original_inversion;
481 
482 	fepriv->auto_sub_step++;
483 	return 0;
484 }
485 
dvb_frontend_swzigzag(struct dvb_frontend * fe)486 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
487 {
488 	enum fe_status s = FE_NONE;
489 	int retval = 0;
490 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
491 	struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp;
492 
493 	if (fepriv->max_drift)
494 		dev_warn_once(fe->dvb->device,
495 			      "Frontend requested software zigzag, but didn't set the frequency step size\n");
496 
497 	/* if we've got no parameters, just keep idling */
498 	if (fepriv->state & FESTATE_IDLE) {
499 		fepriv->delay = 3 * HZ;
500 		fepriv->quality = 0;
501 		return;
502 	}
503 
504 	/* in SCAN mode, we just set the frontend when asked and leave it alone */
505 	if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
506 		if (fepriv->state & FESTATE_RETUNE) {
507 			tmp = *c;
508 			if (fe->ops.set_frontend)
509 				retval = fe->ops.set_frontend(fe);
510 			*c = tmp;
511 			if (retval < 0)
512 				fepriv->state = FESTATE_ERROR;
513 			else
514 				fepriv->state = FESTATE_TUNED;
515 		}
516 		fepriv->delay = 3 * HZ;
517 		fepriv->quality = 0;
518 		return;
519 	}
520 
521 	/* get the frontend status */
522 	if (fepriv->state & FESTATE_RETUNE) {
523 		s = 0;
524 	} else {
525 		if (fe->ops.read_status)
526 			fe->ops.read_status(fe, &s);
527 		if (s != fepriv->status) {
528 			dvb_frontend_add_event(fe, s);
529 			fepriv->status = s;
530 		}
531 	}
532 
533 	/* if we're not tuned, and we have a lock, move to the TUNED state */
534 	if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
535 		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
536 		fepriv->state = FESTATE_TUNED;
537 
538 		/* if we're tuned, then we have determined the correct inversion */
539 		if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
540 		    (c->inversion == INVERSION_AUTO)) {
541 			c->inversion = fepriv->inversion;
542 		}
543 		return;
544 	}
545 
546 	/* if we are tuned already, check we're still locked */
547 	if (fepriv->state & FESTATE_TUNED) {
548 		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
549 
550 		/* we're tuned, and the lock is still good... */
551 		if (s & FE_HAS_LOCK) {
552 			return;
553 		} else { /* if we _WERE_ tuned, but now don't have a lock */
554 			fepriv->state = FESTATE_ZIGZAG_FAST;
555 			fepriv->started_auto_step = fepriv->auto_step;
556 			fepriv->check_wrapped = 0;
557 		}
558 	}
559 
560 	/* don't actually do anything if we're in the LOSTLOCK state,
561 	 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
562 	if ((fepriv->state & FESTATE_LOSTLOCK) &&
563 	    (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
564 		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
565 		return;
566 	}
567 
568 	/* don't do anything if we're in the DISEQC state, since this
569 	 * might be someone with a motorized dish controlled by DISEQC.
570 	 * If its actually a re-tune, there will be a SET_FRONTEND soon enough.	*/
571 	if (fepriv->state & FESTATE_DISEQC) {
572 		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
573 		return;
574 	}
575 
576 	/* if we're in the RETUNE state, set everything up for a brand
577 	 * new scan, keeping the current inversion setting, as the next
578 	 * tune is _very_ likely to require the same */
579 	if (fepriv->state & FESTATE_RETUNE) {
580 		fepriv->lnb_drift = 0;
581 		fepriv->auto_step = 0;
582 		fepriv->auto_sub_step = 0;
583 		fepriv->started_auto_step = 0;
584 		fepriv->check_wrapped = 0;
585 	}
586 
587 	/* fast zigzag. */
588 	if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
589 		fepriv->delay = fepriv->min_delay;
590 
591 		/* perform a tune */
592 		retval = dvb_frontend_swzigzag_autotune(fe,
593 							fepriv->check_wrapped);
594 		if (retval < 0) {
595 			return;
596 		} else if (retval) {
597 			/* OK, if we've run out of trials at the fast speed.
598 			 * Drop back to slow for the _next_ attempt */
599 			fepriv->state = FESTATE_SEARCHING_SLOW;
600 			fepriv->started_auto_step = fepriv->auto_step;
601 			return;
602 		}
603 		fepriv->check_wrapped = 1;
604 
605 		/* if we've just re-tuned, enter the ZIGZAG_FAST state.
606 		 * This ensures we cannot return from an
607 		 * FE_SET_FRONTEND ioctl before the first frontend tune
608 		 * occurs */
609 		if (fepriv->state & FESTATE_RETUNE) {
610 			fepriv->state = FESTATE_TUNING_FAST;
611 		}
612 	}
613 
614 	/* slow zigzag */
615 	if (fepriv->state & FESTATE_SEARCHING_SLOW) {
616 		dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
617 
618 		/* Note: don't bother checking for wrapping; we stay in this
619 		 * state until we get a lock */
620 		dvb_frontend_swzigzag_autotune(fe, 0);
621 	}
622 }
623 
dvb_frontend_is_exiting(struct dvb_frontend * fe)624 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
625 {
626 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
627 
628 	if (fe->exit != DVB_FE_NO_EXIT)
629 		return 1;
630 
631 	if (fepriv->dvbdev->writers == 1)
632 		if (time_after_eq(jiffies, fepriv->release_jiffies +
633 				  dvb_shutdown_timeout * HZ))
634 			return 1;
635 
636 	return 0;
637 }
638 
dvb_frontend_should_wakeup(struct dvb_frontend * fe)639 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
640 {
641 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
642 
643 	if (fepriv->wakeup) {
644 		fepriv->wakeup = 0;
645 		return 1;
646 	}
647 	return dvb_frontend_is_exiting(fe);
648 }
649 
dvb_frontend_wakeup(struct dvb_frontend * fe)650 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
651 {
652 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
653 
654 	fepriv->wakeup = 1;
655 	wake_up_interruptible(&fepriv->wait_queue);
656 }
657 
dvb_frontend_thread(void * data)658 static int dvb_frontend_thread(void *data)
659 {
660 	struct dvb_frontend *fe = data;
661 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
662 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
663 	enum fe_status s = FE_NONE;
664 	enum dvbfe_algo algo;
665 	bool re_tune = false;
666 	bool semheld = false;
667 
668 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
669 
670 	fepriv->check_wrapped = 0;
671 	fepriv->quality = 0;
672 	fepriv->delay = 3 * HZ;
673 	fepriv->status = 0;
674 	fepriv->wakeup = 0;
675 	fepriv->reinitialise = 0;
676 
677 	dvb_frontend_init(fe);
678 
679 	set_freezable();
680 	while (1) {
681 		up(&fepriv->sem);	    /* is locked when we enter the thread... */
682 restart:
683 		wait_event_interruptible_timeout(fepriv->wait_queue,
684 						 dvb_frontend_should_wakeup(fe) ||
685 						 kthread_should_stop() ||
686 						 freezing(current),
687 			fepriv->delay);
688 
689 		if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
690 			/* got signal or quitting */
691 			if (!down_interruptible(&fepriv->sem))
692 				semheld = true;
693 			fe->exit = DVB_FE_NORMAL_EXIT;
694 			break;
695 		}
696 
697 		if (try_to_freeze())
698 			goto restart;
699 
700 		if (down_interruptible(&fepriv->sem))
701 			break;
702 
703 		if (fepriv->reinitialise) {
704 			dvb_frontend_init(fe);
705 			if (fe->ops.set_tone && fepriv->tone != -1)
706 				fe->ops.set_tone(fe, fepriv->tone);
707 			if (fe->ops.set_voltage && fepriv->voltage != -1)
708 				fe->ops.set_voltage(fe, fepriv->voltage);
709 			fepriv->reinitialise = 0;
710 		}
711 
712 		/* do an iteration of the tuning loop */
713 		if (fe->ops.get_frontend_algo) {
714 			algo = fe->ops.get_frontend_algo(fe);
715 			switch (algo) {
716 			case DVBFE_ALGO_HW:
717 				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__);
718 
719 				if (fepriv->state & FESTATE_RETUNE) {
720 					dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__);
721 					re_tune = true;
722 					fepriv->state = FESTATE_TUNED;
723 				} else {
724 					re_tune = false;
725 				}
726 
727 				if (fe->ops.tune)
728 					fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s);
729 
730 				if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) {
731 					dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__);
732 					dvb_frontend_add_event(fe, s);
733 					fepriv->status = s;
734 				}
735 				break;
736 			case DVBFE_ALGO_SW:
737 				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__);
738 				dvb_frontend_swzigzag(fe);
739 				break;
740 			case DVBFE_ALGO_CUSTOM:
741 				dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state);
742 				if (fepriv->state & FESTATE_RETUNE) {
743 					dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__);
744 					fepriv->state = FESTATE_TUNED;
745 				}
746 				/* Case where we are going to search for a carrier
747 				 * User asked us to retune again for some reason, possibly
748 				 * requesting a search with a new set of parameters
749 				 */
750 				if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) {
751 					if (fe->ops.search) {
752 						fepriv->algo_status = fe->ops.search(fe);
753 						/* We did do a search as was requested, the flags are
754 						 * now unset as well and has the flags wrt to search.
755 						 */
756 					} else {
757 						fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN;
758 					}
759 				}
760 				/* Track the carrier if the search was successful */
761 				if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) {
762 					fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
763 					fepriv->delay = HZ / 2;
764 				}
765 				dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
766 				fe->ops.read_status(fe, &s);
767 				if (s != fepriv->status) {
768 					dvb_frontend_add_event(fe, s); /* update event list */
769 					fepriv->status = s;
770 					if (!(s & FE_HAS_LOCK)) {
771 						fepriv->delay = HZ / 10;
772 						fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
773 					} else {
774 						fepriv->delay = 60 * HZ;
775 					}
776 				}
777 				break;
778 			default:
779 				dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__);
780 				break;
781 			}
782 		} else {
783 			dvb_frontend_swzigzag(fe);
784 		}
785 	}
786 
787 	if (dvb_powerdown_on_sleep) {
788 		if (fe->ops.set_voltage)
789 			fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
790 		if (fe->ops.tuner_ops.sleep) {
791 			if (fe->ops.i2c_gate_ctrl)
792 				fe->ops.i2c_gate_ctrl(fe, 1);
793 			fe->ops.tuner_ops.sleep(fe);
794 			if (fe->ops.i2c_gate_ctrl)
795 				fe->ops.i2c_gate_ctrl(fe, 0);
796 		}
797 		if (fe->ops.sleep)
798 			fe->ops.sleep(fe);
799 	}
800 
801 	fepriv->thread = NULL;
802 	if (kthread_should_stop())
803 		fe->exit = DVB_FE_DEVICE_REMOVED;
804 	else
805 		fe->exit = DVB_FE_NO_EXIT;
806 	mb();
807 
808 	if (semheld)
809 		up(&fepriv->sem);
810 	dvb_frontend_wakeup(fe);
811 	return 0;
812 }
813 
dvb_frontend_stop(struct dvb_frontend * fe)814 static void dvb_frontend_stop(struct dvb_frontend *fe)
815 {
816 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
817 
818 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
819 
820 	if (fe->exit != DVB_FE_DEVICE_REMOVED)
821 		fe->exit = DVB_FE_NORMAL_EXIT;
822 	mb();
823 
824 	if (!fepriv->thread)
825 		return;
826 
827 	kthread_stop(fepriv->thread);
828 
829 	sema_init(&fepriv->sem, 1);
830 	fepriv->state = FESTATE_IDLE;
831 
832 	/* paranoia check in case a signal arrived */
833 	if (fepriv->thread)
834 		dev_warn(fe->dvb->device,
835 			 "dvb_frontend_stop: warning: thread %p won't exit\n",
836 			 fepriv->thread);
837 }
838 
839 /*
840  * Sleep for the amount of time given by add_usec parameter
841  *
842  * This needs to be as precise as possible, as it affects the detection of
843  * the dish tone command at the satellite subsystem. The precision is improved
844  * by using a scheduled msleep followed by udelay for the remainder.
845  */
dvb_frontend_sleep_until(ktime_t * waketime,u32 add_usec)846 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
847 {
848 	s32 delta;
849 
850 	*waketime = ktime_add_us(*waketime, add_usec);
851 	delta = ktime_us_delta(ktime_get_boottime(), *waketime);
852 	if (delta > 2500) {
853 		msleep((delta - 1500) / 1000);
854 		delta = ktime_us_delta(ktime_get_boottime(), *waketime);
855 	}
856 	if (delta > 0)
857 		udelay(delta);
858 }
859 EXPORT_SYMBOL(dvb_frontend_sleep_until);
860 
dvb_frontend_start(struct dvb_frontend * fe)861 static int dvb_frontend_start(struct dvb_frontend *fe)
862 {
863 	int ret;
864 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
865 	struct task_struct *fe_thread;
866 
867 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
868 
869 	if (fepriv->thread) {
870 		if (fe->exit == DVB_FE_NO_EXIT)
871 			return 0;
872 		else
873 			dvb_frontend_stop(fe);
874 	}
875 
876 	if (signal_pending(current))
877 		return -EINTR;
878 	if (down_interruptible(&fepriv->sem))
879 		return -EINTR;
880 
881 	fepriv->state = FESTATE_IDLE;
882 	fe->exit = DVB_FE_NO_EXIT;
883 	fepriv->thread = NULL;
884 	mb();
885 
886 	fe_thread = kthread_run(dvb_frontend_thread, fe,
887 				"kdvb-ad-%i-fe-%i", fe->dvb->num, fe->id);
888 	if (IS_ERR(fe_thread)) {
889 		ret = PTR_ERR(fe_thread);
890 		dev_warn(fe->dvb->device,
891 			 "dvb_frontend_start: failed to start kthread (%d)\n",
892 			 ret);
893 		up(&fepriv->sem);
894 		return ret;
895 	}
896 	fepriv->thread = fe_thread;
897 	return 0;
898 }
899 
dvb_frontend_get_frequency_limits(struct dvb_frontend * fe,u32 * freq_min,u32 * freq_max,u32 * tolerance)900 static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe,
901 					      u32 *freq_min, u32 *freq_max,
902 					      u32 *tolerance)
903 {
904 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
905 	u32 tuner_min = fe->ops.tuner_ops.info.frequency_min_hz;
906 	u32 tuner_max = fe->ops.tuner_ops.info.frequency_max_hz;
907 	u32 frontend_min = fe->ops.info.frequency_min_hz;
908 	u32 frontend_max = fe->ops.info.frequency_max_hz;
909 
910 	*freq_min = max(frontend_min, tuner_min);
911 
912 	if (frontend_max == 0)
913 		*freq_max = tuner_max;
914 	else if (tuner_max == 0)
915 		*freq_max = frontend_max;
916 	else
917 		*freq_max = min(frontend_max, tuner_max);
918 
919 	if (*freq_min == 0 || *freq_max == 0)
920 		dev_warn(fe->dvb->device,
921 			 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
922 			 fe->dvb->num, fe->id);
923 
924 	dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
925 		tuner_min, tuner_max, frontend_min, frontend_max);
926 
927 	/* If the standard is for satellite, convert frequencies to kHz */
928 	switch (c->delivery_system) {
929 	case SYS_DSS:
930 	case SYS_DVBS:
931 	case SYS_DVBS2:
932 	case SYS_TURBO:
933 	case SYS_ISDBS:
934 		*freq_min /= kHz;
935 		*freq_max /= kHz;
936 		if (tolerance)
937 			*tolerance = fe->ops.info.frequency_tolerance_hz / kHz;
938 
939 		break;
940 	default:
941 		if (tolerance)
942 			*tolerance = fe->ops.info.frequency_tolerance_hz;
943 		break;
944 	}
945 }
946 
dvb_frontend_get_stepsize(struct dvb_frontend * fe)947 static u32 dvb_frontend_get_stepsize(struct dvb_frontend *fe)
948 {
949 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
950 	u32 fe_step = fe->ops.info.frequency_stepsize_hz;
951 	u32 tuner_step = fe->ops.tuner_ops.info.frequency_step_hz;
952 	u32 step = max(fe_step, tuner_step);
953 
954 	switch (c->delivery_system) {
955 	case SYS_DSS:
956 	case SYS_DVBS:
957 	case SYS_DVBS2:
958 	case SYS_TURBO:
959 	case SYS_ISDBS:
960 		step /= kHz;
961 		break;
962 	default:
963 		break;
964 	}
965 
966 	return step;
967 }
968 
dvb_frontend_check_parameters(struct dvb_frontend * fe)969 static int dvb_frontend_check_parameters(struct dvb_frontend *fe)
970 {
971 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
972 	u32 freq_min;
973 	u32 freq_max;
974 
975 	/* range check: frequency */
976 	dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max, NULL);
977 	if ((freq_min && c->frequency < freq_min) ||
978 	    (freq_max && c->frequency > freq_max)) {
979 		dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n",
980 			 fe->dvb->num, fe->id, c->frequency,
981 			 freq_min, freq_max);
982 		return -EINVAL;
983 	}
984 
985 	/* range check: symbol rate */
986 	switch (c->delivery_system) {
987 	case SYS_DSS:
988 	case SYS_DVBS:
989 	case SYS_DVBS2:
990 	case SYS_TURBO:
991 	case SYS_DVBC_ANNEX_A:
992 	case SYS_DVBC_ANNEX_C:
993 		if ((fe->ops.info.symbol_rate_min &&
994 		     c->symbol_rate < fe->ops.info.symbol_rate_min) ||
995 		    (fe->ops.info.symbol_rate_max &&
996 		     c->symbol_rate > fe->ops.info.symbol_rate_max)) {
997 			dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n",
998 				 fe->dvb->num, fe->id, c->symbol_rate,
999 				 fe->ops.info.symbol_rate_min,
1000 				 fe->ops.info.symbol_rate_max);
1001 			return -EINVAL;
1002 		}
1003 		break;
1004 	default:
1005 		break;
1006 	}
1007 
1008 	return 0;
1009 }
1010 
dvb_frontend_clear_cache(struct dvb_frontend * fe)1011 static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
1012 {
1013 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1014 	int i;
1015 	u32 delsys;
1016 
1017 	delsys = c->delivery_system;
1018 	memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
1019 	c->delivery_system = delsys;
1020 
1021 	dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
1022 		__func__, c->delivery_system);
1023 
1024 	c->transmission_mode = TRANSMISSION_MODE_AUTO;
1025 	c->bandwidth_hz = 0;	/* AUTO */
1026 	c->guard_interval = GUARD_INTERVAL_AUTO;
1027 	c->hierarchy = HIERARCHY_AUTO;
1028 	c->symbol_rate = 0;
1029 	c->code_rate_HP = FEC_AUTO;
1030 	c->code_rate_LP = FEC_AUTO;
1031 	c->fec_inner = FEC_AUTO;
1032 	c->rolloff = ROLLOFF_AUTO;
1033 	c->voltage = SEC_VOLTAGE_OFF;
1034 	c->sectone = SEC_TONE_OFF;
1035 	c->pilot = PILOT_AUTO;
1036 
1037 	c->isdbt_partial_reception = 0;
1038 	c->isdbt_sb_mode = 0;
1039 	c->isdbt_sb_subchannel = 0;
1040 	c->isdbt_sb_segment_idx = 0;
1041 	c->isdbt_sb_segment_count = 0;
1042 	c->isdbt_layer_enabled = 7;	/* All layers (A,B,C) */
1043 	for (i = 0; i < 3; i++) {
1044 		c->layer[i].fec = FEC_AUTO;
1045 		c->layer[i].modulation = QAM_AUTO;
1046 		c->layer[i].interleaving = 0;
1047 		c->layer[i].segment_count = 0;
1048 	}
1049 
1050 	c->stream_id = NO_STREAM_ID_FILTER;
1051 	c->scrambling_sequence_index = 0;/* default sequence */
1052 
1053 	switch (c->delivery_system) {
1054 	case SYS_DSS:
1055 		c->modulation = QPSK;
1056 		c->rolloff = ROLLOFF_20;
1057 		break;
1058 	case SYS_DVBS:
1059 	case SYS_DVBS2:
1060 	case SYS_TURBO:
1061 		c->modulation = QPSK;   /* implied for DVB-S in legacy API */
1062 		c->rolloff = ROLLOFF_35;/* implied for DVB-S */
1063 		break;
1064 	case SYS_ATSC:
1065 		c->modulation = VSB_8;
1066 		break;
1067 	case SYS_ISDBS:
1068 		c->symbol_rate = 28860000;
1069 		c->rolloff = ROLLOFF_35;
1070 		c->bandwidth_hz = c->symbol_rate / 100 * 135;
1071 		break;
1072 	default:
1073 		c->modulation = QAM_AUTO;
1074 		break;
1075 	}
1076 
1077 	c->lna = LNA_AUTO;
1078 
1079 	return 0;
1080 }
1081 
1082 #define _DTV_CMD(n) \
1083 	[n] =  #n
1084 
1085 static char *dtv_cmds[DTV_MAX_COMMAND + 1] = {
1086 	_DTV_CMD(DTV_TUNE),
1087 	_DTV_CMD(DTV_CLEAR),
1088 
1089 	/* Set */
1090 	_DTV_CMD(DTV_FREQUENCY),
1091 	_DTV_CMD(DTV_BANDWIDTH_HZ),
1092 	_DTV_CMD(DTV_MODULATION),
1093 	_DTV_CMD(DTV_INVERSION),
1094 	_DTV_CMD(DTV_DISEQC_MASTER),
1095 	_DTV_CMD(DTV_SYMBOL_RATE),
1096 	_DTV_CMD(DTV_INNER_FEC),
1097 	_DTV_CMD(DTV_VOLTAGE),
1098 	_DTV_CMD(DTV_TONE),
1099 	_DTV_CMD(DTV_PILOT),
1100 	_DTV_CMD(DTV_ROLLOFF),
1101 	_DTV_CMD(DTV_DELIVERY_SYSTEM),
1102 	_DTV_CMD(DTV_HIERARCHY),
1103 	_DTV_CMD(DTV_CODE_RATE_HP),
1104 	_DTV_CMD(DTV_CODE_RATE_LP),
1105 	_DTV_CMD(DTV_GUARD_INTERVAL),
1106 	_DTV_CMD(DTV_TRANSMISSION_MODE),
1107 	_DTV_CMD(DTV_INTERLEAVING),
1108 
1109 	_DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION),
1110 	_DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING),
1111 	_DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID),
1112 	_DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX),
1113 	_DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT),
1114 	_DTV_CMD(DTV_ISDBT_LAYER_ENABLED),
1115 	_DTV_CMD(DTV_ISDBT_LAYERA_FEC),
1116 	_DTV_CMD(DTV_ISDBT_LAYERA_MODULATION),
1117 	_DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT),
1118 	_DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING),
1119 	_DTV_CMD(DTV_ISDBT_LAYERB_FEC),
1120 	_DTV_CMD(DTV_ISDBT_LAYERB_MODULATION),
1121 	_DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT),
1122 	_DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING),
1123 	_DTV_CMD(DTV_ISDBT_LAYERC_FEC),
1124 	_DTV_CMD(DTV_ISDBT_LAYERC_MODULATION),
1125 	_DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT),
1126 	_DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING),
1127 
1128 	_DTV_CMD(DTV_STREAM_ID),
1129 	_DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY),
1130 	_DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX),
1131 	_DTV_CMD(DTV_LNA),
1132 
1133 	/* Get */
1134 	_DTV_CMD(DTV_DISEQC_SLAVE_REPLY),
1135 	_DTV_CMD(DTV_API_VERSION),
1136 
1137 	_DTV_CMD(DTV_ENUM_DELSYS),
1138 
1139 	_DTV_CMD(DTV_ATSCMH_PARADE_ID),
1140 	_DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE),
1141 
1142 	_DTV_CMD(DTV_ATSCMH_FIC_VER),
1143 	_DTV_CMD(DTV_ATSCMH_NOG),
1144 	_DTV_CMD(DTV_ATSCMH_TNOG),
1145 	_DTV_CMD(DTV_ATSCMH_SGN),
1146 	_DTV_CMD(DTV_ATSCMH_PRC),
1147 	_DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE),
1148 	_DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI),
1149 	_DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC),
1150 	_DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE),
1151 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A),
1152 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B),
1153 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C),
1154 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D),
1155 
1156 	/* Statistics API */
1157 	_DTV_CMD(DTV_STAT_SIGNAL_STRENGTH),
1158 	_DTV_CMD(DTV_STAT_CNR),
1159 	_DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT),
1160 	_DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT),
1161 	_DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT),
1162 	_DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT),
1163 	_DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT),
1164 	_DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT),
1165 };
1166 
dtv_cmd_name(u32 cmd)1167 static char *dtv_cmd_name(u32 cmd)
1168 {
1169 	cmd = array_index_nospec(cmd, DTV_MAX_COMMAND);
1170 	return dtv_cmds[cmd];
1171 }
1172 
1173 /* Synchronise the legacy tuning parameters into the cache, so that demodulator
1174  * drivers can use a single set_frontend tuning function, regardless of whether
1175  * it's being used for the legacy or new API, reducing code and complexity.
1176  */
dtv_property_cache_sync(struct dvb_frontend * fe,struct dtv_frontend_properties * c,const struct dvb_frontend_parameters * p)1177 static int dtv_property_cache_sync(struct dvb_frontend *fe,
1178 				   struct dtv_frontend_properties *c,
1179 				   const struct dvb_frontend_parameters *p)
1180 {
1181 	c->frequency = p->frequency;
1182 	c->inversion = p->inversion;
1183 
1184 	switch (dvbv3_type(c->delivery_system)) {
1185 	case DVBV3_QPSK:
1186 		dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1187 		c->symbol_rate = p->u.qpsk.symbol_rate;
1188 		c->fec_inner = p->u.qpsk.fec_inner;
1189 		break;
1190 	case DVBV3_QAM:
1191 		dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1192 		c->symbol_rate = p->u.qam.symbol_rate;
1193 		c->fec_inner = p->u.qam.fec_inner;
1194 		c->modulation = p->u.qam.modulation;
1195 		break;
1196 	case DVBV3_OFDM:
1197 		dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1198 
1199 		switch (p->u.ofdm.bandwidth) {
1200 		case BANDWIDTH_10_MHZ:
1201 			c->bandwidth_hz = 10000000;
1202 			break;
1203 		case BANDWIDTH_8_MHZ:
1204 			c->bandwidth_hz = 8000000;
1205 			break;
1206 		case BANDWIDTH_7_MHZ:
1207 			c->bandwidth_hz = 7000000;
1208 			break;
1209 		case BANDWIDTH_6_MHZ:
1210 			c->bandwidth_hz = 6000000;
1211 			break;
1212 		case BANDWIDTH_5_MHZ:
1213 			c->bandwidth_hz = 5000000;
1214 			break;
1215 		case BANDWIDTH_1_712_MHZ:
1216 			c->bandwidth_hz = 1712000;
1217 			break;
1218 		case BANDWIDTH_AUTO:
1219 			c->bandwidth_hz = 0;
1220 		}
1221 
1222 		c->code_rate_HP = p->u.ofdm.code_rate_HP;
1223 		c->code_rate_LP = p->u.ofdm.code_rate_LP;
1224 		c->modulation = p->u.ofdm.constellation;
1225 		c->transmission_mode = p->u.ofdm.transmission_mode;
1226 		c->guard_interval = p->u.ofdm.guard_interval;
1227 		c->hierarchy = p->u.ofdm.hierarchy_information;
1228 		break;
1229 	case DVBV3_ATSC:
1230 		dev_dbg(fe->dvb->device, "%s: Preparing ATSC req\n", __func__);
1231 		c->modulation = p->u.vsb.modulation;
1232 		if (c->delivery_system == SYS_ATSCMH)
1233 			break;
1234 		if ((c->modulation == VSB_8) || (c->modulation == VSB_16))
1235 			c->delivery_system = SYS_ATSC;
1236 		else
1237 			c->delivery_system = SYS_DVBC_ANNEX_B;
1238 		break;
1239 	case DVBV3_UNKNOWN:
1240 		dev_err(fe->dvb->device,
1241 			"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1242 			__func__, c->delivery_system);
1243 		return -EINVAL;
1244 	}
1245 
1246 	return 0;
1247 }
1248 
1249 /* Ensure the cached values are set correctly in the frontend
1250  * legacy tuning structures, for the advanced tuning API.
1251  */
1252 static int
dtv_property_legacy_params_sync(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p)1253 dtv_property_legacy_params_sync(struct dvb_frontend *fe,
1254 				const struct dtv_frontend_properties *c,
1255 				struct dvb_frontend_parameters *p)
1256 {
1257 	p->frequency = c->frequency;
1258 	p->inversion = c->inversion;
1259 
1260 	switch (dvbv3_type(c->delivery_system)) {
1261 	case DVBV3_UNKNOWN:
1262 		dev_err(fe->dvb->device,
1263 			"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
1264 			__func__, c->delivery_system);
1265 		return -EINVAL;
1266 	case DVBV3_QPSK:
1267 		dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__);
1268 		p->u.qpsk.symbol_rate = c->symbol_rate;
1269 		p->u.qpsk.fec_inner = c->fec_inner;
1270 		break;
1271 	case DVBV3_QAM:
1272 		dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__);
1273 		p->u.qam.symbol_rate = c->symbol_rate;
1274 		p->u.qam.fec_inner = c->fec_inner;
1275 		p->u.qam.modulation = c->modulation;
1276 		break;
1277 	case DVBV3_OFDM:
1278 		dev_dbg(fe->dvb->device, "%s: Preparing OFDM req\n", __func__);
1279 		switch (c->bandwidth_hz) {
1280 		case 10000000:
1281 			p->u.ofdm.bandwidth = BANDWIDTH_10_MHZ;
1282 			break;
1283 		case 8000000:
1284 			p->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
1285 			break;
1286 		case 7000000:
1287 			p->u.ofdm.bandwidth = BANDWIDTH_7_MHZ;
1288 			break;
1289 		case 6000000:
1290 			p->u.ofdm.bandwidth = BANDWIDTH_6_MHZ;
1291 			break;
1292 		case 5000000:
1293 			p->u.ofdm.bandwidth = BANDWIDTH_5_MHZ;
1294 			break;
1295 		case 1712000:
1296 			p->u.ofdm.bandwidth = BANDWIDTH_1_712_MHZ;
1297 			break;
1298 		case 0:
1299 		default:
1300 			p->u.ofdm.bandwidth = BANDWIDTH_AUTO;
1301 		}
1302 		p->u.ofdm.code_rate_HP = c->code_rate_HP;
1303 		p->u.ofdm.code_rate_LP = c->code_rate_LP;
1304 		p->u.ofdm.constellation = c->modulation;
1305 		p->u.ofdm.transmission_mode = c->transmission_mode;
1306 		p->u.ofdm.guard_interval = c->guard_interval;
1307 		p->u.ofdm.hierarchy_information = c->hierarchy;
1308 		break;
1309 	case DVBV3_ATSC:
1310 		dev_dbg(fe->dvb->device, "%s: Preparing VSB req\n", __func__);
1311 		p->u.vsb.modulation = c->modulation;
1312 		break;
1313 	}
1314 	return 0;
1315 }
1316 
1317 /**
1318  * dtv_get_frontend - calls a callback for retrieving DTV parameters
1319  * @fe:		struct dvb_frontend pointer
1320  * @c:		struct dtv_frontend_properties pointer (DVBv5 cache)
1321  * @p_out:	struct dvb_frontend_parameters pointer (DVBv3 FE struct)
1322  *
1323  * This routine calls either the DVBv3 or DVBv5 get_frontend call.
1324  * If c is not null, it will update the DVBv5 cache struct pointed by it.
1325  * If p_out is not null, it will update the DVBv3 params pointed by it.
1326  */
dtv_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c,struct dvb_frontend_parameters * p_out)1327 static int dtv_get_frontend(struct dvb_frontend *fe,
1328 			    struct dtv_frontend_properties *c,
1329 			    struct dvb_frontend_parameters *p_out)
1330 {
1331 	int r;
1332 
1333 	if (fe->ops.get_frontend) {
1334 		r = fe->ops.get_frontend(fe, c);
1335 		if (unlikely(r < 0))
1336 			return r;
1337 		if (p_out)
1338 			dtv_property_legacy_params_sync(fe, c, p_out);
1339 		return 0;
1340 	}
1341 
1342 	/* As everything is in cache, get_frontend fops are always supported */
1343 	return 0;
1344 }
1345 
1346 static int dvb_frontend_handle_ioctl(struct file *file,
1347 				     unsigned int cmd, void *parg);
1348 
dtv_property_process_get(struct dvb_frontend * fe,const struct dtv_frontend_properties * c,struct dtv_property * tvp,struct file * file)1349 static int dtv_property_process_get(struct dvb_frontend *fe,
1350 				    const struct dtv_frontend_properties *c,
1351 				    struct dtv_property *tvp,
1352 				    struct file *file)
1353 {
1354 	int ncaps;
1355 	unsigned int len = 1;
1356 
1357 	switch (tvp->cmd) {
1358 	case DTV_ENUM_DELSYS:
1359 		ncaps = 0;
1360 		while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1361 			tvp->u.buffer.data[ncaps] = fe->ops.delsys[ncaps];
1362 			ncaps++;
1363 		}
1364 		tvp->u.buffer.len = ncaps;
1365 		len = ncaps;
1366 		break;
1367 	case DTV_FREQUENCY:
1368 		tvp->u.data = c->frequency;
1369 		break;
1370 	case DTV_MODULATION:
1371 		tvp->u.data = c->modulation;
1372 		break;
1373 	case DTV_BANDWIDTH_HZ:
1374 		tvp->u.data = c->bandwidth_hz;
1375 		break;
1376 	case DTV_INVERSION:
1377 		tvp->u.data = c->inversion;
1378 		break;
1379 	case DTV_SYMBOL_RATE:
1380 		tvp->u.data = c->symbol_rate;
1381 		break;
1382 	case DTV_INNER_FEC:
1383 		tvp->u.data = c->fec_inner;
1384 		break;
1385 	case DTV_PILOT:
1386 		tvp->u.data = c->pilot;
1387 		break;
1388 	case DTV_ROLLOFF:
1389 		tvp->u.data = c->rolloff;
1390 		break;
1391 	case DTV_DELIVERY_SYSTEM:
1392 		tvp->u.data = c->delivery_system;
1393 		break;
1394 	case DTV_VOLTAGE:
1395 		tvp->u.data = c->voltage;
1396 		break;
1397 	case DTV_TONE:
1398 		tvp->u.data = c->sectone;
1399 		break;
1400 	case DTV_API_VERSION:
1401 		tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
1402 		break;
1403 	case DTV_CODE_RATE_HP:
1404 		tvp->u.data = c->code_rate_HP;
1405 		break;
1406 	case DTV_CODE_RATE_LP:
1407 		tvp->u.data = c->code_rate_LP;
1408 		break;
1409 	case DTV_GUARD_INTERVAL:
1410 		tvp->u.data = c->guard_interval;
1411 		break;
1412 	case DTV_TRANSMISSION_MODE:
1413 		tvp->u.data = c->transmission_mode;
1414 		break;
1415 	case DTV_HIERARCHY:
1416 		tvp->u.data = c->hierarchy;
1417 		break;
1418 	case DTV_INTERLEAVING:
1419 		tvp->u.data = c->interleaving;
1420 		break;
1421 
1422 	/* ISDB-T Support here */
1423 	case DTV_ISDBT_PARTIAL_RECEPTION:
1424 		tvp->u.data = c->isdbt_partial_reception;
1425 		break;
1426 	case DTV_ISDBT_SOUND_BROADCASTING:
1427 		tvp->u.data = c->isdbt_sb_mode;
1428 		break;
1429 	case DTV_ISDBT_SB_SUBCHANNEL_ID:
1430 		tvp->u.data = c->isdbt_sb_subchannel;
1431 		break;
1432 	case DTV_ISDBT_SB_SEGMENT_IDX:
1433 		tvp->u.data = c->isdbt_sb_segment_idx;
1434 		break;
1435 	case DTV_ISDBT_SB_SEGMENT_COUNT:
1436 		tvp->u.data = c->isdbt_sb_segment_count;
1437 		break;
1438 	case DTV_ISDBT_LAYER_ENABLED:
1439 		tvp->u.data = c->isdbt_layer_enabled;
1440 		break;
1441 	case DTV_ISDBT_LAYERA_FEC:
1442 		tvp->u.data = c->layer[0].fec;
1443 		break;
1444 	case DTV_ISDBT_LAYERA_MODULATION:
1445 		tvp->u.data = c->layer[0].modulation;
1446 		break;
1447 	case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
1448 		tvp->u.data = c->layer[0].segment_count;
1449 		break;
1450 	case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
1451 		tvp->u.data = c->layer[0].interleaving;
1452 		break;
1453 	case DTV_ISDBT_LAYERB_FEC:
1454 		tvp->u.data = c->layer[1].fec;
1455 		break;
1456 	case DTV_ISDBT_LAYERB_MODULATION:
1457 		tvp->u.data = c->layer[1].modulation;
1458 		break;
1459 	case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
1460 		tvp->u.data = c->layer[1].segment_count;
1461 		break;
1462 	case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
1463 		tvp->u.data = c->layer[1].interleaving;
1464 		break;
1465 	case DTV_ISDBT_LAYERC_FEC:
1466 		tvp->u.data = c->layer[2].fec;
1467 		break;
1468 	case DTV_ISDBT_LAYERC_MODULATION:
1469 		tvp->u.data = c->layer[2].modulation;
1470 		break;
1471 	case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
1472 		tvp->u.data = c->layer[2].segment_count;
1473 		break;
1474 	case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
1475 		tvp->u.data = c->layer[2].interleaving;
1476 		break;
1477 
1478 	/* Multistream support */
1479 	case DTV_STREAM_ID:
1480 	case DTV_DVBT2_PLP_ID_LEGACY:
1481 		tvp->u.data = c->stream_id;
1482 		break;
1483 
1484 	/* Physical layer scrambling support */
1485 	case DTV_SCRAMBLING_SEQUENCE_INDEX:
1486 		tvp->u.data = c->scrambling_sequence_index;
1487 		break;
1488 
1489 	/* ATSC-MH */
1490 	case DTV_ATSCMH_FIC_VER:
1491 		tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver;
1492 		break;
1493 	case DTV_ATSCMH_PARADE_ID:
1494 		tvp->u.data = fe->dtv_property_cache.atscmh_parade_id;
1495 		break;
1496 	case DTV_ATSCMH_NOG:
1497 		tvp->u.data = fe->dtv_property_cache.atscmh_nog;
1498 		break;
1499 	case DTV_ATSCMH_TNOG:
1500 		tvp->u.data = fe->dtv_property_cache.atscmh_tnog;
1501 		break;
1502 	case DTV_ATSCMH_SGN:
1503 		tvp->u.data = fe->dtv_property_cache.atscmh_sgn;
1504 		break;
1505 	case DTV_ATSCMH_PRC:
1506 		tvp->u.data = fe->dtv_property_cache.atscmh_prc;
1507 		break;
1508 	case DTV_ATSCMH_RS_FRAME_MODE:
1509 		tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_mode;
1510 		break;
1511 	case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
1512 		tvp->u.data = fe->dtv_property_cache.atscmh_rs_frame_ensemble;
1513 		break;
1514 	case DTV_ATSCMH_RS_CODE_MODE_PRI:
1515 		tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_pri;
1516 		break;
1517 	case DTV_ATSCMH_RS_CODE_MODE_SEC:
1518 		tvp->u.data = fe->dtv_property_cache.atscmh_rs_code_mode_sec;
1519 		break;
1520 	case DTV_ATSCMH_SCCC_BLOCK_MODE:
1521 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_block_mode;
1522 		break;
1523 	case DTV_ATSCMH_SCCC_CODE_MODE_A:
1524 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_a;
1525 		break;
1526 	case DTV_ATSCMH_SCCC_CODE_MODE_B:
1527 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_b;
1528 		break;
1529 	case DTV_ATSCMH_SCCC_CODE_MODE_C:
1530 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_c;
1531 		break;
1532 	case DTV_ATSCMH_SCCC_CODE_MODE_D:
1533 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
1534 		break;
1535 
1536 	case DTV_LNA:
1537 		tvp->u.data = c->lna;
1538 		break;
1539 
1540 	/* Fill quality measures */
1541 	case DTV_STAT_SIGNAL_STRENGTH:
1542 		tvp->u.st = c->strength;
1543 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1544 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1545 		len = tvp->u.buffer.len;
1546 		break;
1547 	case DTV_STAT_CNR:
1548 		tvp->u.st = c->cnr;
1549 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1550 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1551 		len = tvp->u.buffer.len;
1552 		break;
1553 	case DTV_STAT_PRE_ERROR_BIT_COUNT:
1554 		tvp->u.st = c->pre_bit_error;
1555 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1556 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1557 		len = tvp->u.buffer.len;
1558 		break;
1559 	case DTV_STAT_PRE_TOTAL_BIT_COUNT:
1560 		tvp->u.st = c->pre_bit_count;
1561 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1562 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1563 		len = tvp->u.buffer.len;
1564 		break;
1565 	case DTV_STAT_POST_ERROR_BIT_COUNT:
1566 		tvp->u.st = c->post_bit_error;
1567 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1568 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1569 		len = tvp->u.buffer.len;
1570 		break;
1571 	case DTV_STAT_POST_TOTAL_BIT_COUNT:
1572 		tvp->u.st = c->post_bit_count;
1573 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1574 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1575 		len = tvp->u.buffer.len;
1576 		break;
1577 	case DTV_STAT_ERROR_BLOCK_COUNT:
1578 		tvp->u.st = c->block_error;
1579 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1580 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1581 		len = tvp->u.buffer.len;
1582 		break;
1583 	case DTV_STAT_TOTAL_BLOCK_COUNT:
1584 		tvp->u.st = c->block_count;
1585 		if (tvp->u.buffer.len > MAX_DTV_STATS * sizeof(u32))
1586 			tvp->u.buffer.len = MAX_DTV_STATS * sizeof(u32);
1587 		len = tvp->u.buffer.len;
1588 		break;
1589 	default:
1590 		dev_dbg(fe->dvb->device,
1591 			"%s: FE property %d doesn't exist\n",
1592 			__func__, tvp->cmd);
1593 		return -EINVAL;
1594 	}
1595 
1596 	if (len < 1)
1597 		len = 1;
1598 
1599 	dev_dbg(fe->dvb->device,
1600 		"%s: GET cmd 0x%08x (%s) len %d: %*ph\n",
1601 		__func__, tvp->cmd, dtv_cmd_name(tvp->cmd),
1602 		tvp->u.buffer.len, tvp->u.buffer.len, tvp->u.buffer.data);
1603 
1604 	return 0;
1605 }
1606 
1607 static int dtv_set_frontend(struct dvb_frontend *fe);
1608 
is_dvbv3_delsys(u32 delsys)1609 static bool is_dvbv3_delsys(u32 delsys)
1610 {
1611 	return (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
1612 	       (delsys == SYS_DVBS) || (delsys == SYS_ATSC);
1613 }
1614 
1615 /**
1616  * emulate_delivery_system - emulate a DVBv5 delivery system with a DVBv3 type
1617  * @fe:			struct frontend;
1618  * @delsys:			DVBv5 type that will be used for emulation
1619  *
1620  * Provides emulation for delivery systems that are compatible with the old
1621  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1622  * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
1623  * parameters are compatible with DVB-S spec.
1624  */
emulate_delivery_system(struct dvb_frontend * fe,u32 delsys)1625 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
1626 {
1627 	int i;
1628 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1629 
1630 	c->delivery_system = delsys;
1631 
1632 	/*
1633 	 * If the call is for ISDB-T, put it into full-seg, auto mode, TV
1634 	 */
1635 	if (c->delivery_system == SYS_ISDBT) {
1636 		dev_dbg(fe->dvb->device,
1637 			"%s: Using defaults for SYS_ISDBT\n",
1638 			__func__);
1639 
1640 		if (!c->bandwidth_hz)
1641 			c->bandwidth_hz = 6000000;
1642 
1643 		c->isdbt_partial_reception = 0;
1644 		c->isdbt_sb_mode = 0;
1645 		c->isdbt_sb_subchannel = 0;
1646 		c->isdbt_sb_segment_idx = 0;
1647 		c->isdbt_sb_segment_count = 0;
1648 		c->isdbt_layer_enabled = 7;
1649 		for (i = 0; i < 3; i++) {
1650 			c->layer[i].fec = FEC_AUTO;
1651 			c->layer[i].modulation = QAM_AUTO;
1652 			c->layer[i].interleaving = 0;
1653 			c->layer[i].segment_count = 0;
1654 		}
1655 	}
1656 	dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",
1657 		__func__, c->delivery_system);
1658 
1659 	return 0;
1660 }
1661 
1662 /**
1663  * dvbv5_set_delivery_system - Sets the delivery system for a DVBv5 API call
1664  * @fe:			frontend struct
1665  * @desired_system:	delivery system requested by the user
1666  *
1667  * A DVBv5 call know what's the desired system it wants. So, set it.
1668  *
1669  * There are, however, a few known issues with early DVBv5 applications that
1670  * are also handled by this logic:
1671  *
1672  * 1) Some early apps use SYS_UNDEFINED as the desired delivery system.
1673  *    This is an API violation, but, as we don't want to break userspace,
1674  *    convert it to the first supported delivery system.
1675  * 2) Some apps might be using a DVBv5 call in a wrong way, passing, for
1676  *    example, SYS_DVBT instead of SYS_ISDBT. This is because early usage of
1677  *    ISDB-T provided backward compat with DVB-T.
1678  */
dvbv5_set_delivery_system(struct dvb_frontend * fe,u32 desired_system)1679 static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
1680 				     u32 desired_system)
1681 {
1682 	int ncaps;
1683 	u32 delsys = SYS_UNDEFINED;
1684 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1685 	enum dvbv3_emulation_type type;
1686 
1687 	/*
1688 	 * It was reported that some old DVBv5 applications were
1689 	 * filling delivery_system with SYS_UNDEFINED. If this happens,
1690 	 * assume that the application wants to use the first supported
1691 	 * delivery system.
1692 	 */
1693 	if (desired_system == SYS_UNDEFINED)
1694 		desired_system = fe->ops.delsys[0];
1695 
1696 	/*
1697 	 * This is a DVBv5 call. So, it likely knows the supported
1698 	 * delivery systems. So, check if the desired delivery system is
1699 	 * supported
1700 	 */
1701 	ncaps = 0;
1702 	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1703 		if (fe->ops.delsys[ncaps] == desired_system) {
1704 			c->delivery_system = desired_system;
1705 			dev_dbg(fe->dvb->device,
1706 				"%s: Changing delivery system to %d\n",
1707 				__func__, desired_system);
1708 			return 0;
1709 		}
1710 		ncaps++;
1711 	}
1712 
1713 	/*
1714 	 * The requested delivery system isn't supported. Maybe userspace
1715 	 * is requesting a DVBv3 compatible delivery system.
1716 	 *
1717 	 * The emulation only works if the desired system is one of the
1718 	 * delivery systems supported by DVBv3 API
1719 	 */
1720 	if (!is_dvbv3_delsys(desired_system)) {
1721 		dev_dbg(fe->dvb->device,
1722 			"%s: Delivery system %d not supported.\n",
1723 			__func__, desired_system);
1724 		return -EINVAL;
1725 	}
1726 
1727 	type = dvbv3_type(desired_system);
1728 
1729 	/*
1730 	* Get the last non-DVBv3 delivery system that has the same type
1731 	* of the desired system
1732 	*/
1733 	ncaps = 0;
1734 	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1735 		if (dvbv3_type(fe->ops.delsys[ncaps]) == type)
1736 			delsys = fe->ops.delsys[ncaps];
1737 		ncaps++;
1738 	}
1739 
1740 	/* There's nothing compatible with the desired delivery system */
1741 	if (delsys == SYS_UNDEFINED) {
1742 		dev_dbg(fe->dvb->device,
1743 			"%s: Delivery system %d not supported on emulation mode.\n",
1744 			__func__, desired_system);
1745 		return -EINVAL;
1746 	}
1747 
1748 	dev_dbg(fe->dvb->device,
1749 		"%s: Using delivery system %d emulated as if it were %d\n",
1750 		__func__, delsys, desired_system);
1751 
1752 	return emulate_delivery_system(fe, desired_system);
1753 }
1754 
1755 /**
1756  * dvbv3_set_delivery_system - Sets the delivery system for a DVBv3 API call
1757  * @fe:	frontend struct
1758  *
1759  * A DVBv3 call doesn't know what's the desired system it wants. It also
1760  * doesn't allow to switch between different types. Due to that, userspace
1761  * should use DVBv5 instead.
1762  * However, in order to avoid breaking userspace API, limited backward
1763  * compatibility support is provided.
1764  *
1765  * There are some delivery systems that are incompatible with DVBv3 calls.
1766  *
1767  * This routine should work fine for frontends that support just one delivery
1768  * system.
1769  *
1770  * For frontends that support multiple frontends:
1771  * 1) It defaults to use the first supported delivery system. There's an
1772  *    userspace application that allows changing it at runtime;
1773  *
1774  * 2) If the current delivery system is not compatible with DVBv3, it gets
1775  *    the first one that it is compatible.
1776  *
1777  * NOTE: in order for this to work with applications like Kaffeine that
1778  *	uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
1779  *	DVB-S, drivers that support both DVB-S and DVB-S2 should have the
1780  *	SYS_DVBS entry before the SYS_DVBS2, otherwise it won't switch back
1781  *	to DVB-S.
1782  */
dvbv3_set_delivery_system(struct dvb_frontend * fe)1783 static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
1784 {
1785 	int ncaps;
1786 	u32 delsys = SYS_UNDEFINED;
1787 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1788 
1789 	/* If not set yet, defaults to the first supported delivery system */
1790 	if (c->delivery_system == SYS_UNDEFINED)
1791 		c->delivery_system = fe->ops.delsys[0];
1792 
1793 	/*
1794 	 * Trivial case: just use the current one, if it already a DVBv3
1795 	 * delivery system
1796 	 */
1797 	if (is_dvbv3_delsys(c->delivery_system)) {
1798 		dev_dbg(fe->dvb->device,
1799 			"%s: Using delivery system to %d\n",
1800 			__func__, c->delivery_system);
1801 		return 0;
1802 	}
1803 
1804 	/*
1805 	 * Seek for the first delivery system that it is compatible with a
1806 	 * DVBv3 standard
1807 	 */
1808 	ncaps = 0;
1809 	while (ncaps < MAX_DELSYS && fe->ops.delsys[ncaps]) {
1810 		if (dvbv3_type(fe->ops.delsys[ncaps]) != DVBV3_UNKNOWN) {
1811 			delsys = fe->ops.delsys[ncaps];
1812 			break;
1813 		}
1814 		ncaps++;
1815 	}
1816 	if (delsys == SYS_UNDEFINED) {
1817 		dev_dbg(fe->dvb->device,
1818 			"%s: Couldn't find a delivery system that works with FE_SET_FRONTEND\n",
1819 			__func__);
1820 		return -EINVAL;
1821 	}
1822 	return emulate_delivery_system(fe, delsys);
1823 }
1824 
prepare_tuning_algo_parameters(struct dvb_frontend * fe)1825 static void prepare_tuning_algo_parameters(struct dvb_frontend *fe)
1826 {
1827 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1828 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
1829 	struct dvb_frontend_tune_settings fetunesettings = { 0 };
1830 
1831 	/* get frontend-specific tuning settings */
1832 	if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1833 		fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
1834 		fepriv->max_drift = fetunesettings.max_drift;
1835 		fepriv->step_size = fetunesettings.step_size;
1836 	} else {
1837 		/* default values */
1838 		switch (c->delivery_system) {
1839 		case SYS_DSS:
1840 		case SYS_DVBS:
1841 		case SYS_DVBS2:
1842 		case SYS_ISDBS:
1843 		case SYS_TURBO:
1844 		case SYS_DVBC_ANNEX_A:
1845 		case SYS_DVBC_ANNEX_C:
1846 			fepriv->min_delay = HZ / 20;
1847 			fepriv->step_size = c->symbol_rate / 16000;
1848 			fepriv->max_drift = c->symbol_rate / 2000;
1849 			break;
1850 		case SYS_DVBT:
1851 		case SYS_DVBT2:
1852 		case SYS_ISDBT:
1853 		case SYS_DTMB:
1854 			fepriv->min_delay = HZ / 20;
1855 			fepriv->step_size = dvb_frontend_get_stepsize(fe) * 2;
1856 			fepriv->max_drift = fepriv->step_size + 1;
1857 			break;
1858 		default:
1859 			/*
1860 			 * FIXME: This sounds wrong! if freqency_stepsize is
1861 			 * defined by the frontend, why not use it???
1862 			 */
1863 			fepriv->min_delay = HZ / 20;
1864 			fepriv->step_size = 0; /* no zigzag */
1865 			fepriv->max_drift = 0;
1866 			break;
1867 		}
1868 	}
1869 	if (dvb_override_tune_delay > 0)
1870 		fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
1871 }
1872 
1873 /**
1874  * dtv_property_process_set -  Sets a single DTV property
1875  * @fe:		Pointer to &struct dvb_frontend
1876  * @file:	Pointer to &struct file
1877  * @cmd:	Digital TV command
1878  * @data:	An unsigned 32-bits number
1879  *
1880  * This routine assigns the property
1881  * value to the corresponding member of
1882  * &struct dtv_frontend_properties
1883  *
1884  * Returns:
1885  * Zero on success, negative errno on failure.
1886  */
dtv_property_process_set(struct dvb_frontend * fe,struct file * file,u32 cmd,u32 data)1887 static int dtv_property_process_set(struct dvb_frontend *fe,
1888 				    struct file *file,
1889 				    u32 cmd, u32 data)
1890 {
1891 	int r = 0;
1892 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1893 
1894 	/** Dump DTV command name and value*/
1895 	if (!cmd || cmd > DTV_MAX_COMMAND)
1896 		dev_warn(fe->dvb->device, "%s: SET cmd 0x%08x undefined\n",
1897 			 __func__, cmd);
1898 	else
1899 		dev_dbg(fe->dvb->device,
1900 			"%s: SET cmd 0x%08x (%s) to 0x%08x\n",
1901 			__func__, cmd, dtv_cmd_name(cmd), data);
1902 	switch (cmd) {
1903 	case DTV_CLEAR:
1904 		/*
1905 		 * Reset a cache of data specific to the frontend here. This does
1906 		 * not effect hardware.
1907 		 */
1908 		dvb_frontend_clear_cache(fe);
1909 		break;
1910 	case DTV_TUNE:
1911 		/*
1912 		 * Use the cached Digital TV properties to tune the
1913 		 * frontend
1914 		 */
1915 		dev_dbg(fe->dvb->device,
1916 			"%s: Setting the frontend from property cache\n",
1917 			__func__);
1918 
1919 		r = dtv_set_frontend(fe);
1920 		break;
1921 	case DTV_FREQUENCY:
1922 		c->frequency = data;
1923 		break;
1924 	case DTV_MODULATION:
1925 		c->modulation = data;
1926 		break;
1927 	case DTV_BANDWIDTH_HZ:
1928 		c->bandwidth_hz = data;
1929 		break;
1930 	case DTV_INVERSION:
1931 		c->inversion = data;
1932 		break;
1933 	case DTV_SYMBOL_RATE:
1934 		c->symbol_rate = data;
1935 		break;
1936 	case DTV_INNER_FEC:
1937 		c->fec_inner = data;
1938 		break;
1939 	case DTV_PILOT:
1940 		c->pilot = data;
1941 		break;
1942 	case DTV_ROLLOFF:
1943 		c->rolloff = data;
1944 		break;
1945 	case DTV_DELIVERY_SYSTEM:
1946 		r = dvbv5_set_delivery_system(fe, data);
1947 		break;
1948 	case DTV_VOLTAGE:
1949 		c->voltage = data;
1950 		r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
1951 					      (void *)c->voltage);
1952 		break;
1953 	case DTV_TONE:
1954 		c->sectone = data;
1955 		r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
1956 					      (void *)c->sectone);
1957 		break;
1958 	case DTV_CODE_RATE_HP:
1959 		c->code_rate_HP = data;
1960 		break;
1961 	case DTV_CODE_RATE_LP:
1962 		c->code_rate_LP = data;
1963 		break;
1964 	case DTV_GUARD_INTERVAL:
1965 		c->guard_interval = data;
1966 		break;
1967 	case DTV_TRANSMISSION_MODE:
1968 		c->transmission_mode = data;
1969 		break;
1970 	case DTV_HIERARCHY:
1971 		c->hierarchy = data;
1972 		break;
1973 	case DTV_INTERLEAVING:
1974 		c->interleaving = data;
1975 		break;
1976 
1977 	/* ISDB-T Support here */
1978 	case DTV_ISDBT_PARTIAL_RECEPTION:
1979 		c->isdbt_partial_reception = data;
1980 		break;
1981 	case DTV_ISDBT_SOUND_BROADCASTING:
1982 		c->isdbt_sb_mode = data;
1983 		break;
1984 	case DTV_ISDBT_SB_SUBCHANNEL_ID:
1985 		c->isdbt_sb_subchannel = data;
1986 		break;
1987 	case DTV_ISDBT_SB_SEGMENT_IDX:
1988 		c->isdbt_sb_segment_idx = data;
1989 		break;
1990 	case DTV_ISDBT_SB_SEGMENT_COUNT:
1991 		c->isdbt_sb_segment_count = data;
1992 		break;
1993 	case DTV_ISDBT_LAYER_ENABLED:
1994 		c->isdbt_layer_enabled = data;
1995 		break;
1996 	case DTV_ISDBT_LAYERA_FEC:
1997 		c->layer[0].fec = data;
1998 		break;
1999 	case DTV_ISDBT_LAYERA_MODULATION:
2000 		c->layer[0].modulation = data;
2001 		break;
2002 	case DTV_ISDBT_LAYERA_SEGMENT_COUNT:
2003 		c->layer[0].segment_count = data;
2004 		break;
2005 	case DTV_ISDBT_LAYERA_TIME_INTERLEAVING:
2006 		c->layer[0].interleaving = data;
2007 		break;
2008 	case DTV_ISDBT_LAYERB_FEC:
2009 		c->layer[1].fec = data;
2010 		break;
2011 	case DTV_ISDBT_LAYERB_MODULATION:
2012 		c->layer[1].modulation = data;
2013 		break;
2014 	case DTV_ISDBT_LAYERB_SEGMENT_COUNT:
2015 		c->layer[1].segment_count = data;
2016 		break;
2017 	case DTV_ISDBT_LAYERB_TIME_INTERLEAVING:
2018 		c->layer[1].interleaving = data;
2019 		break;
2020 	case DTV_ISDBT_LAYERC_FEC:
2021 		c->layer[2].fec = data;
2022 		break;
2023 	case DTV_ISDBT_LAYERC_MODULATION:
2024 		c->layer[2].modulation = data;
2025 		break;
2026 	case DTV_ISDBT_LAYERC_SEGMENT_COUNT:
2027 		c->layer[2].segment_count = data;
2028 		break;
2029 	case DTV_ISDBT_LAYERC_TIME_INTERLEAVING:
2030 		c->layer[2].interleaving = data;
2031 		break;
2032 
2033 	/* Multistream support */
2034 	case DTV_STREAM_ID:
2035 	case DTV_DVBT2_PLP_ID_LEGACY:
2036 		c->stream_id = data;
2037 		break;
2038 
2039 	/* Physical layer scrambling support */
2040 	case DTV_SCRAMBLING_SEQUENCE_INDEX:
2041 		c->scrambling_sequence_index = data;
2042 		break;
2043 
2044 	/* ATSC-MH */
2045 	case DTV_ATSCMH_PARADE_ID:
2046 		fe->dtv_property_cache.atscmh_parade_id = data;
2047 		break;
2048 	case DTV_ATSCMH_RS_FRAME_ENSEMBLE:
2049 		fe->dtv_property_cache.atscmh_rs_frame_ensemble = data;
2050 		break;
2051 
2052 	case DTV_LNA:
2053 		c->lna = data;
2054 		if (fe->ops.set_lna)
2055 			r = fe->ops.set_lna(fe);
2056 		if (r < 0)
2057 			c->lna = LNA_AUTO;
2058 		break;
2059 
2060 	default:
2061 		return -EINVAL;
2062 	}
2063 
2064 	return r;
2065 }
2066 
dvb_frontend_do_ioctl(struct file * file,unsigned int cmd,void * parg)2067 static int dvb_frontend_do_ioctl(struct file *file, unsigned int cmd,
2068 				 void *parg)
2069 {
2070 	struct dvb_device *dvbdev = file->private_data;
2071 	struct dvb_frontend *fe = dvbdev->priv;
2072 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2073 	int err;
2074 
2075 	dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
2076 	if (down_interruptible(&fepriv->sem))
2077 		return -ERESTARTSYS;
2078 
2079 	if (fe->exit != DVB_FE_NO_EXIT) {
2080 		up(&fepriv->sem);
2081 		return -ENODEV;
2082 	}
2083 
2084 	/*
2085 	 * If the frontend is opened in read-only mode, only the ioctls
2086 	 * that don't interfere with the tune logic should be accepted.
2087 	 * That allows an external application to monitor the DVB QoS and
2088 	 * statistics parameters.
2089 	 *
2090 	 * That matches all _IOR() ioctls, except for two special cases:
2091 	 *   - FE_GET_EVENT is part of the tuning logic on a DVB application;
2092 	 *   - FE_DISEQC_RECV_SLAVE_REPLY is part of DiSEqC 2.0
2093 	 *     setup
2094 	 * So, those two ioctls should also return -EPERM, as otherwise
2095 	 * reading from them would interfere with a DVB tune application
2096 	 */
2097 	if ((file->f_flags & O_ACCMODE) == O_RDONLY
2098 	    && (_IOC_DIR(cmd) != _IOC_READ
2099 		|| cmd == FE_GET_EVENT
2100 		|| cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
2101 		up(&fepriv->sem);
2102 		return -EPERM;
2103 	}
2104 
2105 	err = dvb_frontend_handle_ioctl(file, cmd, parg);
2106 
2107 	up(&fepriv->sem);
2108 	return err;
2109 }
2110 
dvb_frontend_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2111 static long dvb_frontend_ioctl(struct file *file, unsigned int cmd,
2112 			       unsigned long arg)
2113 {
2114 	struct dvb_device *dvbdev = file->private_data;
2115 
2116 	if (!dvbdev)
2117 		return -ENODEV;
2118 
2119 	return dvb_usercopy(file, cmd, arg, dvb_frontend_do_ioctl);
2120 }
2121 
2122 #ifdef CONFIG_COMPAT
2123 struct compat_dtv_property {
2124 	__u32 cmd;
2125 	__u32 reserved[3];
2126 	union {
2127 		__u32 data;
2128 		struct dtv_fe_stats st;
2129 		struct {
2130 			__u8 data[32];
2131 			__u32 len;
2132 			__u32 reserved1[3];
2133 			compat_uptr_t reserved2;
2134 		} buffer;
2135 	} u;
2136 	int result;
2137 } __attribute__ ((packed));
2138 
2139 struct compat_dtv_properties {
2140 	__u32 num;
2141 	compat_uptr_t props;
2142 };
2143 
2144 #define COMPAT_FE_SET_PROPERTY	   _IOW('o', 82, struct compat_dtv_properties)
2145 #define COMPAT_FE_GET_PROPERTY	   _IOR('o', 83, struct compat_dtv_properties)
2146 
dvb_frontend_handle_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2147 static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
2148 					    unsigned long arg)
2149 {
2150 	struct dvb_device *dvbdev = file->private_data;
2151 	struct dvb_frontend *fe = dvbdev->priv;
2152 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2153 	int i, err = 0;
2154 
2155 	if (cmd == COMPAT_FE_SET_PROPERTY) {
2156 		struct compat_dtv_properties prop, *tvps = NULL;
2157 		struct compat_dtv_property *tvp = NULL;
2158 
2159 		if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2160 			return -EFAULT;
2161 
2162 		tvps = &prop;
2163 
2164 		/*
2165 		 * Put an arbitrary limit on the number of messages that can
2166 		 * be sent at once
2167 		 */
2168 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2169 			return -EINVAL;
2170 
2171 		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2172 		if (IS_ERR(tvp))
2173 			return PTR_ERR(tvp);
2174 
2175 		for (i = 0; i < tvps->num; i++) {
2176 			err = dtv_property_process_set(fe, file,
2177 						       (tvp + i)->cmd,
2178 						       (tvp + i)->u.data);
2179 			if (err < 0) {
2180 				kfree(tvp);
2181 				return err;
2182 			}
2183 		}
2184 		kfree(tvp);
2185 	} else if (cmd == COMPAT_FE_GET_PROPERTY) {
2186 		struct compat_dtv_properties prop, *tvps = NULL;
2187 		struct compat_dtv_property *tvp = NULL;
2188 		struct dtv_frontend_properties getp = fe->dtv_property_cache;
2189 
2190 		if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop)))
2191 			return -EFAULT;
2192 
2193 		tvps = &prop;
2194 
2195 		/*
2196 		 * Put an arbitrary limit on the number of messages that can
2197 		 * be sent at once
2198 		 */
2199 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2200 			return -EINVAL;
2201 
2202 		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
2203 		if (IS_ERR(tvp))
2204 			return PTR_ERR(tvp);
2205 
2206 		/*
2207 		 * Let's use our own copy of property cache, in order to
2208 		 * avoid mangling with DTV zigzag logic, as drivers might
2209 		 * return crap, if they don't check if the data is available
2210 		 * before updating the properties cache.
2211 		 */
2212 		if (fepriv->state != FESTATE_IDLE) {
2213 			err = dtv_get_frontend(fe, &getp, NULL);
2214 			if (err < 0) {
2215 				kfree(tvp);
2216 				return err;
2217 			}
2218 		}
2219 		for (i = 0; i < tvps->num; i++) {
2220 			err = dtv_property_process_get(
2221 			    fe, &getp, (struct dtv_property *)(tvp + i), file);
2222 			if (err < 0) {
2223 				kfree(tvp);
2224 				return err;
2225 			}
2226 		}
2227 
2228 		if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp,
2229 				 tvps->num * sizeof(struct compat_dtv_property))) {
2230 			kfree(tvp);
2231 			return -EFAULT;
2232 		}
2233 		kfree(tvp);
2234 	}
2235 
2236 	return err;
2237 }
2238 
dvb_frontend_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2239 static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd,
2240 				      unsigned long arg)
2241 {
2242 	struct dvb_device *dvbdev = file->private_data;
2243 	struct dvb_frontend *fe = dvbdev->priv;
2244 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2245 	int err;
2246 
2247 	if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) {
2248 		if (down_interruptible(&fepriv->sem))
2249 			return -ERESTARTSYS;
2250 
2251 		err = dvb_frontend_handle_compat_ioctl(file, cmd, arg);
2252 
2253 		up(&fepriv->sem);
2254 		return err;
2255 	}
2256 
2257 	return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2258 }
2259 #endif
2260 
dtv_set_frontend(struct dvb_frontend * fe)2261 static int dtv_set_frontend(struct dvb_frontend *fe)
2262 {
2263 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2264 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2265 	u32 rolloff = 0;
2266 
2267 	if (dvb_frontend_check_parameters(fe) < 0)
2268 		return -EINVAL;
2269 
2270 	/*
2271 	 * Initialize output parameters to match the values given by
2272 	 * the user. FE_SET_FRONTEND triggers an initial frontend event
2273 	 * with status = 0, which copies output parameters to userspace.
2274 	 */
2275 	dtv_property_legacy_params_sync(fe, c, &fepriv->parameters_out);
2276 
2277 	/*
2278 	 * Be sure that the bandwidth will be filled for all
2279 	 * non-satellite systems, as tuners need to know what
2280 	 * low pass/Nyquist half filter should be applied, in
2281 	 * order to avoid inter-channel noise.
2282 	 *
2283 	 * ISDB-T and DVB-T/T2 already sets bandwidth.
2284 	 * ATSC and DVB-C don't set, so, the core should fill it.
2285 	 *
2286 	 * On DVB-C Annex A and C, the bandwidth is a function of
2287 	 * the roll-off and symbol rate. Annex B defines different
2288 	 * roll-off factors depending on the modulation. Fortunately,
2289 	 * Annex B is only used with 6MHz, so there's no need to
2290 	 * calculate it.
2291 	 *
2292 	 * While not officially supported, a side effect of handling it at
2293 	 * the cache level is that a program could retrieve the bandwidth
2294 	 * via DTV_BANDWIDTH_HZ, which may be useful for test programs.
2295 	 */
2296 	switch (c->delivery_system) {
2297 	case SYS_ATSC:
2298 	case SYS_DVBC_ANNEX_B:
2299 		c->bandwidth_hz = 6000000;
2300 		break;
2301 	case SYS_DVBC_ANNEX_A:
2302 		rolloff = 115;
2303 		break;
2304 	case SYS_DVBC_ANNEX_C:
2305 		rolloff = 113;
2306 		break;
2307 	case SYS_DSS:
2308 		rolloff = 120;
2309 		break;
2310 	case SYS_DVBS:
2311 	case SYS_TURBO:
2312 	case SYS_ISDBS:
2313 		rolloff = 135;
2314 		break;
2315 	case SYS_DVBS2:
2316 		switch (c->rolloff) {
2317 		case ROLLOFF_20:
2318 			rolloff = 120;
2319 			break;
2320 		case ROLLOFF_25:
2321 			rolloff = 125;
2322 			break;
2323 		default:
2324 		case ROLLOFF_35:
2325 			rolloff = 135;
2326 		}
2327 		break;
2328 	default:
2329 		break;
2330 	}
2331 	if (rolloff)
2332 		c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
2333 
2334 	/* force auto frequency inversion if requested */
2335 	if (dvb_force_auto_inversion)
2336 		c->inversion = INVERSION_AUTO;
2337 
2338 	/*
2339 	 * without hierarchical coding code_rate_LP is irrelevant,
2340 	 * so we tolerate the otherwise invalid FEC_NONE setting
2341 	 */
2342 	if (c->hierarchy == HIERARCHY_NONE && c->code_rate_LP == FEC_NONE)
2343 		c->code_rate_LP = FEC_AUTO;
2344 
2345 	prepare_tuning_algo_parameters(fe);
2346 
2347 	fepriv->state = FESTATE_RETUNE;
2348 
2349 	/* Request the search algorithm to search */
2350 	fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN;
2351 
2352 	dvb_frontend_clear_events(fe);
2353 	dvb_frontend_add_event(fe, 0);
2354 	dvb_frontend_wakeup(fe);
2355 	fepriv->status = 0;
2356 
2357 	return 0;
2358 }
2359 
dvb_get_property(struct dvb_frontend * fe,struct file * file,struct dtv_properties * tvps)2360 static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2361 			    struct dtv_properties *tvps)
2362 {
2363 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2364 	struct dtv_property *tvp = NULL;
2365 	struct dtv_frontend_properties getp;
2366 	int i, err;
2367 
2368 	memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2369 
2370 	dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2371 		__func__, tvps->num);
2372 	dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2373 		__func__, tvps->props);
2374 
2375 	/*
2376 	 * Put an arbitrary limit on the number of messages that can
2377 	 * be sent at once
2378 	 */
2379 	if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2380 		return -EINVAL;
2381 
2382 	tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2383 	if (IS_ERR(tvp))
2384 		return PTR_ERR(tvp);
2385 
2386 	/*
2387 	 * Let's use our own copy of property cache, in order to
2388 	 * avoid mangling with DTV zigzag logic, as drivers might
2389 	 * return crap, if they don't check if the data is available
2390 	 * before updating the properties cache.
2391 	 */
2392 	if (fepriv->state != FESTATE_IDLE) {
2393 		err = dtv_get_frontend(fe, &getp, NULL);
2394 		if (err < 0)
2395 			goto out;
2396 	}
2397 	for (i = 0; i < tvps->num; i++) {
2398 		err = dtv_property_process_get(fe, &getp,
2399 					       tvp + i, file);
2400 		if (err < 0)
2401 			goto out;
2402 	}
2403 
2404 	if (copy_to_user((void __user *)tvps->props, tvp,
2405 			 tvps->num * sizeof(struct dtv_property))) {
2406 		err = -EFAULT;
2407 		goto out;
2408 	}
2409 
2410 	err = 0;
2411 out:
2412 	kfree(tvp);
2413 	return err;
2414 }
2415 
dvb_get_frontend(struct dvb_frontend * fe,struct dvb_frontend_parameters * p_out)2416 static int dvb_get_frontend(struct dvb_frontend *fe,
2417 			    struct dvb_frontend_parameters *p_out)
2418 {
2419 	struct dtv_frontend_properties getp;
2420 
2421 	/*
2422 	 * Let's use our own copy of property cache, in order to
2423 	 * avoid mangling with DTV zigzag logic, as drivers might
2424 	 * return crap, if they don't check if the data is available
2425 	 * before updating the properties cache.
2426 	 */
2427 	memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2428 
2429 	return dtv_get_frontend(fe, &getp, p_out);
2430 }
2431 
dvb_frontend_handle_ioctl(struct file * file,unsigned int cmd,void * parg)2432 static int dvb_frontend_handle_ioctl(struct file *file,
2433 				     unsigned int cmd, void *parg)
2434 {
2435 	struct dvb_device *dvbdev = file->private_data;
2436 	struct dvb_frontend *fe = dvbdev->priv;
2437 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2438 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2439 	int i, err = -ENOTSUPP;
2440 
2441 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
2442 
2443 	switch (cmd) {
2444 	case FE_SET_PROPERTY: {
2445 		struct dtv_properties *tvps = parg;
2446 		struct dtv_property *tvp = NULL;
2447 
2448 		dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2449 			__func__, tvps->num);
2450 		dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2451 			__func__, tvps->props);
2452 
2453 		/*
2454 		 * Put an arbitrary limit on the number of messages that can
2455 		 * be sent at once
2456 		 */
2457 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2458 			return -EINVAL;
2459 
2460 		tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2461 		if (IS_ERR(tvp))
2462 			return PTR_ERR(tvp);
2463 
2464 		for (i = 0; i < tvps->num; i++) {
2465 			err = dtv_property_process_set(fe, file,
2466 						       (tvp + i)->cmd,
2467 						       (tvp + i)->u.data);
2468 			if (err < 0) {
2469 				kfree(tvp);
2470 				return err;
2471 			}
2472 		}
2473 		kfree(tvp);
2474 		err = 0;
2475 		break;
2476 	}
2477 	case FE_GET_PROPERTY:
2478 		err = dvb_get_property(fe, file, parg);
2479 		break;
2480 
2481 	case FE_GET_INFO: {
2482 		struct dvb_frontend_info *info = parg;
2483 		memset(info, 0, sizeof(*info));
2484 
2485 		strscpy(info->name, fe->ops.info.name, sizeof(info->name));
2486 		info->symbol_rate_min = fe->ops.info.symbol_rate_min;
2487 		info->symbol_rate_max = fe->ops.info.symbol_rate_max;
2488 		info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
2489 		info->caps = fe->ops.info.caps;
2490 		info->frequency_stepsize = dvb_frontend_get_stepsize(fe);
2491 		dvb_frontend_get_frequency_limits(fe, &info->frequency_min,
2492 						  &info->frequency_max,
2493 						  &info->frequency_tolerance);
2494 
2495 		/*
2496 		 * Associate the 4 delivery systems supported by DVBv3
2497 		 * API with their DVBv5 counterpart. For the other standards,
2498 		 * use the closest type, assuming that it would hopefully
2499 		 * work with a DVBv3 application.
2500 		 * It should be noticed that, on multi-frontend devices with
2501 		 * different types (terrestrial and cable, for example),
2502 		 * a pure DVBv3 application won't be able to use all delivery
2503 		 * systems. Yet, changing the DVBv5 cache to the other delivery
2504 		 * system should be enough for making it work.
2505 		 */
2506 		switch (dvbv3_type(c->delivery_system)) {
2507 		case DVBV3_QPSK:
2508 			info->type = FE_QPSK;
2509 			break;
2510 		case DVBV3_ATSC:
2511 			info->type = FE_ATSC;
2512 			break;
2513 		case DVBV3_QAM:
2514 			info->type = FE_QAM;
2515 			break;
2516 		case DVBV3_OFDM:
2517 			info->type = FE_OFDM;
2518 			break;
2519 		default:
2520 			dev_err(fe->dvb->device,
2521 				"%s: doesn't know how to handle a DVBv3 call to delivery system %i\n",
2522 				__func__, c->delivery_system);
2523 			info->type = FE_OFDM;
2524 		}
2525 		dev_dbg(fe->dvb->device, "%s: current delivery system on cache: %d, V3 type: %d\n",
2526 			__func__, c->delivery_system, info->type);
2527 
2528 		/* Set CAN_INVERSION_AUTO bit on in other than oneshot mode */
2529 		if (!(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT))
2530 			info->caps |= FE_CAN_INVERSION_AUTO;
2531 		err = 0;
2532 		break;
2533 	}
2534 
2535 	case FE_READ_STATUS: {
2536 		enum fe_status *status = parg;
2537 
2538 		/* if retune was requested but hasn't occurred yet, prevent
2539 		 * that user get signal state from previous tuning */
2540 		if (fepriv->state == FESTATE_RETUNE ||
2541 		    fepriv->state == FESTATE_ERROR) {
2542 			err = 0;
2543 			*status = 0;
2544 			break;
2545 		}
2546 
2547 		if (fe->ops.read_status)
2548 			err = fe->ops.read_status(fe, status);
2549 		break;
2550 	}
2551 
2552 	case FE_DISEQC_RESET_OVERLOAD:
2553 		if (fe->ops.diseqc_reset_overload) {
2554 			err = fe->ops.diseqc_reset_overload(fe);
2555 			fepriv->state = FESTATE_DISEQC;
2556 			fepriv->status = 0;
2557 		}
2558 		break;
2559 
2560 	case FE_DISEQC_SEND_MASTER_CMD:
2561 		if (fe->ops.diseqc_send_master_cmd) {
2562 			struct dvb_diseqc_master_cmd *cmd = parg;
2563 
2564 			if (cmd->msg_len > sizeof(cmd->msg)) {
2565 				err = -EINVAL;
2566 				break;
2567 			}
2568 			err = fe->ops.diseqc_send_master_cmd(fe, cmd);
2569 			fepriv->state = FESTATE_DISEQC;
2570 			fepriv->status = 0;
2571 		}
2572 		break;
2573 
2574 	case FE_DISEQC_SEND_BURST:
2575 		if (fe->ops.diseqc_send_burst) {
2576 			err = fe->ops.diseqc_send_burst(fe, (long)parg);
2577 			fepriv->state = FESTATE_DISEQC;
2578 			fepriv->status = 0;
2579 		}
2580 		break;
2581 
2582 	case FE_SET_TONE:
2583 		if (fe->ops.set_tone) {
2584 			fepriv->tone = (long)parg;
2585 			err = fe->ops.set_tone(fe, fepriv->tone);
2586 			fepriv->state = FESTATE_DISEQC;
2587 			fepriv->status = 0;
2588 		}
2589 		break;
2590 
2591 	case FE_SET_VOLTAGE:
2592 		if (fe->ops.set_voltage) {
2593 			fepriv->voltage = (long)parg;
2594 			err = fe->ops.set_voltage(fe, fepriv->voltage);
2595 			fepriv->state = FESTATE_DISEQC;
2596 			fepriv->status = 0;
2597 		}
2598 		break;
2599 
2600 	case FE_DISEQC_RECV_SLAVE_REPLY:
2601 		if (fe->ops.diseqc_recv_slave_reply)
2602 			err = fe->ops.diseqc_recv_slave_reply(fe, parg);
2603 		break;
2604 
2605 	case FE_ENABLE_HIGH_LNB_VOLTAGE:
2606 		if (fe->ops.enable_high_lnb_voltage)
2607 			err = fe->ops.enable_high_lnb_voltage(fe, (long)parg);
2608 		break;
2609 
2610 	case FE_SET_FRONTEND_TUNE_MODE:
2611 		fepriv->tune_mode_flags = (unsigned long)parg;
2612 		err = 0;
2613 		break;
2614 	/* DEPRECATED dish control ioctls */
2615 
2616 	case FE_DISHNETWORK_SEND_LEGACY_CMD:
2617 		if (fe->ops.dishnetwork_send_legacy_command) {
2618 			err = fe->ops.dishnetwork_send_legacy_command(fe,
2619 							 (unsigned long)parg);
2620 			fepriv->state = FESTATE_DISEQC;
2621 			fepriv->status = 0;
2622 		} else if (fe->ops.set_voltage) {
2623 			/*
2624 			 * NOTE: This is a fallback condition.  Some frontends
2625 			 * (stv0299 for instance) take longer than 8msec to
2626 			 * respond to a set_voltage command.  Those switches
2627 			 * need custom routines to switch properly.  For all
2628 			 * other frontends, the following should work ok.
2629 			 * Dish network legacy switches (as used by Dish500)
2630 			 * are controlled by sending 9-bit command words
2631 			 * spaced 8msec apart.
2632 			 * the actual command word is switch/port dependent
2633 			 * so it is up to the userspace application to send
2634 			 * the right command.
2635 			 * The command must always start with a '0' after
2636 			 * initialization, so parg is 8 bits and does not
2637 			 * include the initialization or start bit
2638 			 */
2639 			unsigned long swcmd = ((unsigned long)parg) << 1;
2640 			ktime_t nexttime;
2641 			ktime_t tv[10];
2642 			int i;
2643 			u8 last = 1;
2644 
2645 			if (dvb_frontend_debug)
2646 				dprintk("switch command: 0x%04lx\n",
2647 					swcmd);
2648 			nexttime = ktime_get_boottime();
2649 			if (dvb_frontend_debug)
2650 				tv[0] = nexttime;
2651 			/* before sending a command, initialize by sending
2652 			 * a 32ms 18V to the switch
2653 			 */
2654 			fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
2655 			dvb_frontend_sleep_until(&nexttime, 32000);
2656 
2657 			for (i = 0; i < 9; i++) {
2658 				if (dvb_frontend_debug)
2659 					tv[i + 1] = ktime_get_boottime();
2660 				if ((swcmd & 0x01) != last) {
2661 					/* set voltage to (last ? 13V : 18V) */
2662 					fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
2663 					last = (last) ? 0 : 1;
2664 				}
2665 				swcmd = swcmd >> 1;
2666 				if (i != 8)
2667 					dvb_frontend_sleep_until(&nexttime, 8000);
2668 			}
2669 			if (dvb_frontend_debug) {
2670 				dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2671 					fe->dvb->num);
2672 				for (i = 1; i < 10; i++)
2673 					pr_info("%d: %d\n", i,
2674 						(int)ktime_us_delta(tv[i], tv[i - 1]));
2675 			}
2676 			err = 0;
2677 			fepriv->state = FESTATE_DISEQC;
2678 			fepriv->status = 0;
2679 		}
2680 		break;
2681 
2682 	/* DEPRECATED statistics ioctls */
2683 
2684 	case FE_READ_BER:
2685 		if (fe->ops.read_ber) {
2686 			if (fepriv->thread)
2687 				err = fe->ops.read_ber(fe, parg);
2688 			else
2689 				err = -EAGAIN;
2690 		}
2691 		break;
2692 
2693 	case FE_READ_SIGNAL_STRENGTH:
2694 		if (fe->ops.read_signal_strength) {
2695 			if (fepriv->thread)
2696 				err = fe->ops.read_signal_strength(fe, parg);
2697 			else
2698 				err = -EAGAIN;
2699 		}
2700 		break;
2701 
2702 	case FE_READ_SNR:
2703 		if (fe->ops.read_snr) {
2704 			if (fepriv->thread)
2705 				err = fe->ops.read_snr(fe, parg);
2706 			else
2707 				err = -EAGAIN;
2708 		}
2709 		break;
2710 
2711 	case FE_READ_UNCORRECTED_BLOCKS:
2712 		if (fe->ops.read_ucblocks) {
2713 			if (fepriv->thread)
2714 				err = fe->ops.read_ucblocks(fe, parg);
2715 			else
2716 				err = -EAGAIN;
2717 		}
2718 		break;
2719 
2720 	/* DEPRECATED DVBv3 ioctls */
2721 
2722 	case FE_SET_FRONTEND:
2723 		err = dvbv3_set_delivery_system(fe);
2724 		if (err)
2725 			break;
2726 
2727 		err = dtv_property_cache_sync(fe, c, parg);
2728 		if (err)
2729 			break;
2730 		err = dtv_set_frontend(fe);
2731 		break;
2732 
2733 	case FE_GET_EVENT:
2734 		err = dvb_frontend_get_event(fe, parg, file->f_flags);
2735 		break;
2736 
2737 	case FE_GET_FRONTEND:
2738 		err = dvb_get_frontend(fe, parg);
2739 		break;
2740 
2741 	default:
2742 		return -ENOTSUPP;
2743 	} /* switch */
2744 
2745 	return err;
2746 }
2747 
dvb_frontend_poll(struct file * file,struct poll_table_struct * wait)2748 static __poll_t dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
2749 {
2750 	struct dvb_device *dvbdev = file->private_data;
2751 	struct dvb_frontend *fe = dvbdev->priv;
2752 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2753 
2754 	dev_dbg_ratelimited(fe->dvb->device, "%s:\n", __func__);
2755 
2756 	poll_wait(file, &fepriv->events.wait_queue, wait);
2757 
2758 	if (fepriv->events.eventw != fepriv->events.eventr)
2759 		return (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
2760 
2761 	return 0;
2762 }
2763 
dvb_frontend_open(struct inode * inode,struct file * file)2764 static int dvb_frontend_open(struct inode *inode, struct file *file)
2765 {
2766 	struct dvb_device *dvbdev = file->private_data;
2767 	struct dvb_frontend *fe = dvbdev->priv;
2768 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2769 	struct dvb_adapter *adapter = fe->dvb;
2770 	int ret;
2771 
2772 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
2773 	if (fe->exit == DVB_FE_DEVICE_REMOVED)
2774 		return -ENODEV;
2775 
2776 	if (adapter->mfe_shared == 2) {
2777 		mutex_lock(&adapter->mfe_lock);
2778 		if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2779 			if (adapter->mfe_dvbdev &&
2780 			    !adapter->mfe_dvbdev->writers) {
2781 				mutex_unlock(&adapter->mfe_lock);
2782 				return -EBUSY;
2783 			}
2784 			adapter->mfe_dvbdev = dvbdev;
2785 		}
2786 	} else if (adapter->mfe_shared) {
2787 		mutex_lock(&adapter->mfe_lock);
2788 
2789 		if (!adapter->mfe_dvbdev)
2790 			adapter->mfe_dvbdev = dvbdev;
2791 
2792 		else if (adapter->mfe_dvbdev != dvbdev) {
2793 			struct dvb_device
2794 				*mfedev = adapter->mfe_dvbdev;
2795 			struct dvb_frontend
2796 				*mfe = mfedev->priv;
2797 			struct dvb_frontend_private
2798 				*mfepriv = mfe->frontend_priv;
2799 			int mferetry = (dvb_mfe_wait_time << 1);
2800 
2801 			mutex_unlock(&adapter->mfe_lock);
2802 			while (mferetry-- && (mfedev->users != -1 ||
2803 					      mfepriv->thread)) {
2804 				if (msleep_interruptible(500)) {
2805 					if (signal_pending(current))
2806 						return -EINTR;
2807 				}
2808 			}
2809 
2810 			mutex_lock(&adapter->mfe_lock);
2811 			if (adapter->mfe_dvbdev != dvbdev) {
2812 				mfedev = adapter->mfe_dvbdev;
2813 				mfe = mfedev->priv;
2814 				mfepriv = mfe->frontend_priv;
2815 				if (mfedev->users != -1 ||
2816 				    mfepriv->thread) {
2817 					mutex_unlock(&adapter->mfe_lock);
2818 					return -EBUSY;
2819 				}
2820 				adapter->mfe_dvbdev = dvbdev;
2821 			}
2822 		}
2823 	}
2824 
2825 	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl) {
2826 		if ((ret = fe->ops.ts_bus_ctrl(fe, 1)) < 0)
2827 			goto err0;
2828 
2829 		/* If we took control of the bus, we need to force
2830 		   reinitialization.  This is because many ts_bus_ctrl()
2831 		   functions strobe the RESET pin on the demod, and if the
2832 		   frontend thread already exists then the dvb_init() routine
2833 		   won't get called (which is what usually does initial
2834 		   register configuration). */
2835 		fepriv->reinitialise = 1;
2836 	}
2837 
2838 	if ((ret = dvb_generic_open(inode, file)) < 0)
2839 		goto err1;
2840 
2841 	if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2842 		/* normal tune mode when opened R/W */
2843 		fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
2844 		fepriv->tone = -1;
2845 		fepriv->voltage = -1;
2846 
2847 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2848 		mutex_lock(&fe->dvb->mdev_lock);
2849 		if (fe->dvb->mdev) {
2850 			mutex_lock(&fe->dvb->mdev->graph_mutex);
2851 			if (fe->dvb->mdev->enable_source)
2852 				ret = fe->dvb->mdev->enable_source(
2853 							   dvbdev->entity,
2854 							   &fepriv->pipe);
2855 			mutex_unlock(&fe->dvb->mdev->graph_mutex);
2856 			if (ret) {
2857 				mutex_unlock(&fe->dvb->mdev_lock);
2858 				dev_err(fe->dvb->device,
2859 					"Tuner is busy. Error %d\n", ret);
2860 				goto err2;
2861 			}
2862 		}
2863 		mutex_unlock(&fe->dvb->mdev_lock);
2864 #endif
2865 		ret = dvb_frontend_start(fe);
2866 		if (ret)
2867 			goto err3;
2868 
2869 		/*  empty event queue */
2870 		fepriv->events.eventr = fepriv->events.eventw = 0;
2871 	}
2872 
2873 	dvb_frontend_get(fe);
2874 
2875 	if (adapter->mfe_shared)
2876 		mutex_unlock(&adapter->mfe_lock);
2877 	return ret;
2878 
2879 err3:
2880 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2881 	mutex_lock(&fe->dvb->mdev_lock);
2882 	if (fe->dvb->mdev) {
2883 		mutex_lock(&fe->dvb->mdev->graph_mutex);
2884 		if (fe->dvb->mdev->disable_source)
2885 			fe->dvb->mdev->disable_source(dvbdev->entity);
2886 		mutex_unlock(&fe->dvb->mdev->graph_mutex);
2887 	}
2888 	mutex_unlock(&fe->dvb->mdev_lock);
2889 err2:
2890 #endif
2891 	dvb_generic_release(inode, file);
2892 err1:
2893 	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
2894 		fe->ops.ts_bus_ctrl(fe, 0);
2895 err0:
2896 	if (adapter->mfe_shared)
2897 		mutex_unlock(&adapter->mfe_lock);
2898 	return ret;
2899 }
2900 
dvb_frontend_release(struct inode * inode,struct file * file)2901 static int dvb_frontend_release(struct inode *inode, struct file *file)
2902 {
2903 	struct dvb_device *dvbdev = file->private_data;
2904 	struct dvb_frontend *fe = dvbdev->priv;
2905 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2906 	int ret;
2907 
2908 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
2909 
2910 	if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
2911 		fepriv->release_jiffies = jiffies;
2912 		mb();
2913 	}
2914 
2915 	ret = dvb_generic_release(inode, file);
2916 
2917 	if (dvbdev->users == -1) {
2918 		wake_up(&fepriv->wait_queue);
2919 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
2920 		mutex_lock(&fe->dvb->mdev_lock);
2921 		if (fe->dvb->mdev) {
2922 			mutex_lock(&fe->dvb->mdev->graph_mutex);
2923 			if (fe->dvb->mdev->disable_source)
2924 				fe->dvb->mdev->disable_source(dvbdev->entity);
2925 			mutex_unlock(&fe->dvb->mdev->graph_mutex);
2926 		}
2927 		mutex_unlock(&fe->dvb->mdev_lock);
2928 #endif
2929 		if (fe->exit != DVB_FE_NO_EXIT)
2930 			wake_up(&dvbdev->wait_queue);
2931 		if (fe->ops.ts_bus_ctrl)
2932 			fe->ops.ts_bus_ctrl(fe, 0);
2933 	}
2934 
2935 	dvb_frontend_put(fe);
2936 
2937 	return ret;
2938 }
2939 
2940 static const struct file_operations dvb_frontend_fops = {
2941 	.owner		= THIS_MODULE,
2942 	.unlocked_ioctl	= dvb_frontend_ioctl,
2943 #ifdef CONFIG_COMPAT
2944 	.compat_ioctl	= dvb_frontend_compat_ioctl,
2945 #endif
2946 	.poll		= dvb_frontend_poll,
2947 	.open		= dvb_frontend_open,
2948 	.release	= dvb_frontend_release,
2949 	.llseek		= noop_llseek,
2950 };
2951 
dvb_frontend_suspend(struct dvb_frontend * fe)2952 int dvb_frontend_suspend(struct dvb_frontend *fe)
2953 {
2954 	int ret = 0;
2955 
2956 	dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2957 		fe->id);
2958 
2959 	if (fe->ops.tuner_ops.suspend)
2960 		ret = fe->ops.tuner_ops.suspend(fe);
2961 	else if (fe->ops.tuner_ops.sleep)
2962 		ret = fe->ops.tuner_ops.sleep(fe);
2963 
2964 	if (fe->ops.suspend)
2965 		ret = fe->ops.suspend(fe);
2966 	else if (fe->ops.sleep)
2967 		ret = fe->ops.sleep(fe);
2968 
2969 	return ret;
2970 }
2971 EXPORT_SYMBOL(dvb_frontend_suspend);
2972 
dvb_frontend_resume(struct dvb_frontend * fe)2973 int dvb_frontend_resume(struct dvb_frontend *fe)
2974 {
2975 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2976 	int ret = 0;
2977 
2978 	dev_dbg(fe->dvb->device, "%s: adap=%d fe=%d\n", __func__, fe->dvb->num,
2979 		fe->id);
2980 
2981 	fe->exit = DVB_FE_DEVICE_RESUME;
2982 	if (fe->ops.resume)
2983 		ret = fe->ops.resume(fe);
2984 	else if (fe->ops.init)
2985 		ret = fe->ops.init(fe);
2986 
2987 	if (fe->ops.tuner_ops.resume)
2988 		ret = fe->ops.tuner_ops.resume(fe);
2989 	else if (fe->ops.tuner_ops.init)
2990 		ret = fe->ops.tuner_ops.init(fe);
2991 
2992 	if (fe->ops.set_tone && fepriv->tone != -1)
2993 		fe->ops.set_tone(fe, fepriv->tone);
2994 	if (fe->ops.set_voltage && fepriv->voltage != -1)
2995 		fe->ops.set_voltage(fe, fepriv->voltage);
2996 
2997 	fe->exit = DVB_FE_NO_EXIT;
2998 	fepriv->state = FESTATE_RETUNE;
2999 	dvb_frontend_wakeup(fe);
3000 
3001 	return ret;
3002 }
3003 EXPORT_SYMBOL(dvb_frontend_resume);
3004 
dvb_register_frontend(struct dvb_adapter * dvb,struct dvb_frontend * fe)3005 int dvb_register_frontend(struct dvb_adapter *dvb,
3006 			  struct dvb_frontend *fe)
3007 {
3008 	struct dvb_frontend_private *fepriv;
3009 	const struct dvb_device dvbdev_template = {
3010 		.users = ~0,
3011 		.writers = 1,
3012 		.readers = (~0) - 1,
3013 		.fops = &dvb_frontend_fops,
3014 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
3015 		.name = fe->ops.info.name,
3016 #endif
3017 	};
3018 	int ret;
3019 
3020 	dev_dbg(dvb->device, "%s:\n", __func__);
3021 
3022 	if (mutex_lock_interruptible(&frontend_mutex))
3023 		return -ERESTARTSYS;
3024 
3025 	fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
3026 	if (!fe->frontend_priv) {
3027 		mutex_unlock(&frontend_mutex);
3028 		return -ENOMEM;
3029 	}
3030 	fepriv = fe->frontend_priv;
3031 
3032 	kref_init(&fe->refcount);
3033 
3034 	/*
3035 	 * After initialization, there need to be two references: one
3036 	 * for dvb_unregister_frontend(), and another one for
3037 	 * dvb_frontend_detach().
3038 	 */
3039 	dvb_frontend_get(fe);
3040 
3041 	sema_init(&fepriv->sem, 1);
3042 	init_waitqueue_head(&fepriv->wait_queue);
3043 	init_waitqueue_head(&fepriv->events.wait_queue);
3044 	mutex_init(&fepriv->events.mtx);
3045 	fe->dvb = dvb;
3046 	fepriv->inversion = INVERSION_OFF;
3047 
3048 	dev_info(fe->dvb->device,
3049 		 "DVB: registering adapter %i frontend %i (%s)...\n",
3050 		 fe->dvb->num, fe->id, fe->ops.info.name);
3051 
3052 	ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3053 			    fe, DVB_DEVICE_FRONTEND, 0);
3054 	if (ret) {
3055 		dvb_frontend_put(fe);
3056 		mutex_unlock(&frontend_mutex);
3057 		return ret;
3058 	}
3059 
3060 	/*
3061 	 * Initialize the cache to the proper values according with the
3062 	 * first supported delivery system (ops->delsys[0])
3063 	 */
3064 
3065 	fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
3066 	dvb_frontend_clear_cache(fe);
3067 
3068 	mutex_unlock(&frontend_mutex);
3069 	return 0;
3070 }
3071 EXPORT_SYMBOL(dvb_register_frontend);
3072 
dvb_unregister_frontend(struct dvb_frontend * fe)3073 int dvb_unregister_frontend(struct dvb_frontend *fe)
3074 {
3075 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
3076 
3077 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
3078 
3079 	mutex_lock(&frontend_mutex);
3080 	dvb_frontend_stop(fe);
3081 	dvb_remove_device(fepriv->dvbdev);
3082 
3083 	/* fe is invalid now */
3084 	mutex_unlock(&frontend_mutex);
3085 	dvb_frontend_put(fe);
3086 	return 0;
3087 }
3088 EXPORT_SYMBOL(dvb_unregister_frontend);
3089 
dvb_frontend_invoke_release(struct dvb_frontend * fe,void (* release)(struct dvb_frontend * fe))3090 static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
3091 					void (*release)(struct dvb_frontend *fe))
3092 {
3093 	if (release) {
3094 		release(fe);
3095 #ifdef CONFIG_MEDIA_ATTACH
3096 		dvb_detach(release);
3097 #endif
3098 	}
3099 }
3100 
dvb_frontend_detach(struct dvb_frontend * fe)3101 void dvb_frontend_detach(struct dvb_frontend *fe)
3102 {
3103 	dvb_frontend_invoke_release(fe, fe->ops.release_sec);
3104 	dvb_frontend_invoke_release(fe, fe->ops.tuner_ops.release);
3105 	dvb_frontend_invoke_release(fe, fe->ops.analog_ops.release);
3106 	dvb_frontend_put(fe);
3107 }
3108 EXPORT_SYMBOL(dvb_frontend_detach);
3109