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Freezer: make kernel threads nonfreezable by default
[linux-2.6-block.git] / drivers / media / dvb / dvb-core / dvb_frontend.c
CommitLineData
1da177e4
LT		 1/*
2 * dvb_frontend.c: DVB frontend tuning interface/thread
3 *
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 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
26 */
27
28#include <linux/string.h>
29#include <linux/kernel.h>
30#include <linux/sched.h>
31#include <linux/wait.h>
32#include <linux/slab.h>
33#include <linux/poll.h>
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/list.h>
7dfb7103 37#include <linux/freezer.h>
cc89c229 38#include <linux/jiffies.h>
8eec1429 39#include <linux/kthread.h>
1da177e4 40#include <asm/processor.h>
1da177e4
LT		 41
42#include "dvb_frontend.h"
43#include "dvbdev.h"
44
45static int dvb_frontend_debug;
46static int dvb_shutdown_timeout = 5;
47static int dvb_force_auto_inversion;
48static int dvb_override_tune_delay;
49static int dvb_powerdown_on_sleep = 1;
50
51module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
f4f009a7 52MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
6baad3f0 53module_param(dvb_shutdown_timeout, int, 0644);
1da177e4 54MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
6baad3f0 55module_param(dvb_force_auto_inversion, int, 0644);
1da177e4 56MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
6baad3f0 57module_param(dvb_override_tune_delay, int, 0644);
1da177e4 58MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
6baad3f0 59module_param(dvb_powerdown_on_sleep, int, 0644);
a8558577 60MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
1da177e4
LT		 61
62#define dprintk if (dvb_frontend_debug) printk
63
64#define FESTATE_IDLE 1
65#define FESTATE_RETUNE 2
66#define FESTATE_TUNING_FAST 4
67#define FESTATE_TUNING_SLOW 8
68#define FESTATE_TUNED 16
69#define FESTATE_ZIGZAG_FAST 32
70#define FESTATE_ZIGZAG_SLOW 64
71#define FESTATE_DISEQC 128
72#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
73#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
74#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
75#define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
0249ef16
MA		 76
77#define FE_ALGO_HW 1
1da177e4
LT		 78/*
79 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
80 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
81 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
82 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
83 * FESTATE_TUNED. The frontend has successfully locked on.
84 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
85 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
86 * FESTATE_DISEQC. A DISEQC command has just been issued.
87 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
88 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
89 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
90 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
91 */
92
3593cab5 93static DEFINE_MUTEX(frontend_mutex);
1da177e4
LT		 94
95struct dvb_frontend_private {
96
36cb557a 97 /* thread/frontend values */
1da177e4
LT		 98 struct dvb_device *dvbdev;
99 struct dvb_frontend_parameters parameters;
100 struct dvb_fe_events events;
101 struct semaphore sem;
102 struct list_head list_head;
103 wait_queue_head_t wait_queue;
8eec1429 104 struct task_struct *thread;
1da177e4 105 unsigned long release_jiffies;
36cb557a
AQ		 106 unsigned int exit;
107 unsigned int wakeup;
1da177e4 108 fe_status_t status;
400b7083 109 unsigned long tune_mode_flags;
36cb557a 110 unsigned int delay;
86f40cc3 111 unsigned int reinitialise;
64454016
AQ		 112 int tone;
113 int voltage;
36cb557a
AQ		 114
115 /* swzigzag values */
116 unsigned int state;
117 unsigned int bending;
118 int lnb_drift;
119 unsigned int inversion;
120 unsigned int auto_step;
121 unsigned int auto_sub_step;
122 unsigned int started_auto_step;
123 unsigned int min_delay;
124 unsigned int max_drift;
125 unsigned int step_size;
126 int quality;
127 unsigned int check_wrapped;
1da177e4
LT		 128};
129
86f40cc3 130static void dvb_frontend_wakeup(struct dvb_frontend *fe);
1da177e4
LT		 131
132static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
133{
0c53c70f 134 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 135 struct dvb_fe_events *events = &fepriv->events;
136 struct dvb_frontend_event *e;
137 int wp;
138
139 dprintk ("%s\n", __FUNCTION__);
140
141 if (down_interruptible (&events->sem))
142 return;
143
144 wp = (events->eventw + 1) % MAX_EVENT;
145
146 if (wp == events->eventr) {
147 events->overflow = 1;
148 events->eventr = (events->eventr + 1) % MAX_EVENT;
149 }
150
151 e = &events->events[events->eventw];
152
153 memcpy (&e->parameters, &fepriv->parameters,
154 sizeof (struct dvb_frontend_parameters));
155
156 if (status & FE_HAS_LOCK)
dea74869
PB		 157 if (fe->ops.get_frontend)
158 fe->ops.get_frontend(fe, &e->parameters);
1da177e4
LT		 159
160 events->eventw = wp;
161
162 up (&events->sem);
163
164 e->status = status;
165
166 wake_up_interruptible (&events->wait_queue);
167}
168
169static int dvb_frontend_get_event(struct dvb_frontend *fe,
170 struct dvb_frontend_event *event, int flags)
171{
0c53c70f 172 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 173 struct dvb_fe_events *events = &fepriv->events;
174
175 dprintk ("%s\n", __FUNCTION__);
176
177 if (events->overflow) {
178 events->overflow = 0;
179 return -EOVERFLOW;
180 }
181
182 if (events->eventw == events->eventr) {
183 int ret;
184
185 if (flags & O_NONBLOCK)
186 return -EWOULDBLOCK;
187
188 up(&fepriv->sem);
189
190 ret = wait_event_interruptible (events->wait_queue,
191 events->eventw != events->eventr);
192
193 if (down_interruptible (&fepriv->sem))
194 return -ERESTARTSYS;
195
196 if (ret < 0)
197 return ret;
198 }
199
200 if (down_interruptible (&events->sem))
201 return -ERESTARTSYS;
202
203 memcpy (event, &events->events[events->eventr],
204 sizeof(struct dvb_frontend_event));
205
206 events->eventr = (events->eventr + 1) % MAX_EVENT;
207
208 up (&events->sem);
209
210 return 0;
211}
212
213static void dvb_frontend_init(struct dvb_frontend *fe)
214{
215 dprintk ("DVB: initialising frontend %i (%s)...\n",
216 fe->dvb->num,
dea74869
PB		 217 fe->ops.info.name);
218
219 if (fe->ops.init)
220 fe->ops.init(fe);
221 if (fe->ops.tuner_ops.init) {
222 fe->ops.tuner_ops.init(fe);
223 if (fe->ops.i2c_gate_ctrl)
224 fe->ops.i2c_gate_ctrl(fe, 0);
7eef5dd6 225 }
1da177e4
LT		 226}
227
86f40cc3
AQ		 228void dvb_frontend_reinitialise(struct dvb_frontend *fe)
229{
230 struct dvb_frontend_private *fepriv = fe->frontend_priv;
231
232 fepriv->reinitialise = 1;
233 dvb_frontend_wakeup(fe);
234}
235EXPORT_SYMBOL(dvb_frontend_reinitialise);
236
36cb557a 237static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
1da177e4 238{
36cb557a 239 int q2;
1da177e4 240
36cb557a 241 dprintk ("%s\n", __FUNCTION__);
1da177e4 242
36cb557a
AQ		 243 if (locked)
244 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
245 else
246 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
1da177e4 247
36cb557a
AQ		 248 q2 = fepriv->quality - 128;
249 q2 *= q2;
1da177e4 250
36cb557a 251 fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
1da177e4
LT		 252}
253
254/**
255 * Performs automatic twiddling of frontend parameters.
256 *
257 * @param fe The frontend concerned.
258 * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
259 * @returns Number of complete iterations that have been performed.
260 */
36cb557a 261static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
1da177e4
LT		 262{
263 int autoinversion;
264 int ready = 0;
0c53c70f 265 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 266 int original_inversion = fepriv->parameters.inversion;
267 u32 original_frequency = fepriv->parameters.frequency;
268
269 /* are we using autoinversion? */
dea74869 270 autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
1da177e4
LT		 271 (fepriv->parameters.inversion == INVERSION_AUTO));
272
273 /* setup parameters correctly */
274 while(!ready) {
275 /* calculate the lnb_drift */
276 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
277
278 /* wrap the auto_step if we've exceeded the maximum drift */
279 if (fepriv->lnb_drift > fepriv->max_drift) {
280 fepriv->auto_step = 0;
281 fepriv->auto_sub_step = 0;
282 fepriv->lnb_drift = 0;
283 }
284
285 /* perform inversion and +/- zigzag */
286 switch(fepriv->auto_sub_step) {
287 case 0:
288 /* try with the current inversion and current drift setting */
289 ready = 1;
290 break;
291
292 case 1:
293 if (!autoinversion) break;
294
295 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
296 ready = 1;
297 break;
298
299 case 2:
300 if (fepriv->lnb_drift == 0) break;
301
302 fepriv->lnb_drift = -fepriv->lnb_drift;
303 ready = 1;
304 break;
305
306 case 3:
307 if (fepriv->lnb_drift == 0) break;
308 if (!autoinversion) break;
309
310 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
311 fepriv->lnb_drift = -fepriv->lnb_drift;
312 ready = 1;
313 break;
314
315 default:
316 fepriv->auto_step++;
317 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
318 break;
319 }
320
321 if (!ready) fepriv->auto_sub_step++;
322 }
323
324 /* if this attempt would hit where we started, indicate a complete
325 * iteration has occurred */
326 if ((fepriv->auto_step == fepriv->started_auto_step) &&
327 (fepriv->auto_sub_step == 0) && check_wrapped) {
328 return 1;
329 }
330
331 dprintk("%s: drift:%i inversion:%i auto_step:%i "
332 "auto_sub_step:%i started_auto_step:%i\n",
333 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
334 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
335
336 /* set the frontend itself */
337 fepriv->parameters.frequency += fepriv->lnb_drift;
338 if (autoinversion)
339 fepriv->parameters.inversion = fepriv->inversion;
dea74869
PB		 340 if (fe->ops.set_frontend)
341 fe->ops.set_frontend(fe, &fepriv->parameters);
1da177e4
LT		 342
343 fepriv->parameters.frequency = original_frequency;
344 fepriv->parameters.inversion = original_inversion;
345
346 fepriv->auto_sub_step++;
347 return 0;
348}
349
36cb557a
AQ		 350static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
351{
30d9464c 352 fe_status_t s = 0;
36cb557a
AQ		 353 struct dvb_frontend_private *fepriv = fe->frontend_priv;
354
355 /* if we've got no parameters, just keep idling */
356 if (fepriv->state & FESTATE_IDLE) {
357 fepriv->delay = 3*HZ;
358 fepriv->quality = 0;
359 return;
360 }
361
362 /* in SCAN mode, we just set the frontend when asked and leave it alone */
363 if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
364 if (fepriv->state & FESTATE_RETUNE) {
dea74869
PB		 365 if (fe->ops.set_frontend)
366 fe->ops.set_frontend(fe, &fepriv->parameters);
36cb557a
AQ		 367 fepriv->state = FESTATE_TUNED;
368 }
369 fepriv->delay = 3*HZ;
370 fepriv->quality = 0;
371 return;
372 }
373
374 /* get the frontend status */
375 if (fepriv->state & FESTATE_RETUNE) {
376 s = 0;
377 } else {
dea74869
PB		 378 if (fe->ops.read_status)
379 fe->ops.read_status(fe, &s);
36cb557a
AQ		 380 if (s != fepriv->status) {
381 dvb_frontend_add_event(fe, s);
382 fepriv->status = s;
383 }
384 }
385
386 /* if we're not tuned, and we have a lock, move to the TUNED state */
387 if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
388 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
389 fepriv->state = FESTATE_TUNED;
390
391 /* if we're tuned, then we have determined the correct inversion */
dea74869 392 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
36cb557a
AQ		 393 (fepriv->parameters.inversion == INVERSION_AUTO)) {
394 fepriv->parameters.inversion = fepriv->inversion;
395 }
396 return;
397 }
398
399 /* if we are tuned already, check we're still locked */
400 if (fepriv->state & FESTATE_TUNED) {
401 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
402
403 /* we're tuned, and the lock is still good... */
404 if (s & FE_HAS_LOCK) {
405 return;
406 } else { /* if we _WERE_ tuned, but now don't have a lock */
407 fepriv->state = FESTATE_ZIGZAG_FAST;
408 fepriv->started_auto_step = fepriv->auto_step;
409 fepriv->check_wrapped = 0;
410 }
411 }
412
413 /* don't actually do anything if we're in the LOSTLOCK state,
414 * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
415 if ((fepriv->state & FESTATE_LOSTLOCK) &&
dea74869 416 (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
36cb557a
AQ		 417 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
418 return;
419 }
420
421 /* don't do anything if we're in the DISEQC state, since this
422 * might be someone with a motorized dish controlled by DISEQC.
423 * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
424 if (fepriv->state & FESTATE_DISEQC) {
425 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
426 return;
427 }
428
429 /* if we're in the RETUNE state, set everything up for a brand
430 * new scan, keeping the current inversion setting, as the next
431 * tune is _very_ likely to require the same */
432 if (fepriv->state & FESTATE_RETUNE) {
433 fepriv->lnb_drift = 0;
434 fepriv->auto_step = 0;
435 fepriv->auto_sub_step = 0;
436 fepriv->started_auto_step = 0;
437 fepriv->check_wrapped = 0;
438 }
439
440 /* fast zigzag. */
441 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
442 fepriv->delay = fepriv->min_delay;
443
444 /* peform a tune */
445 if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
446 /* OK, if we've run out of trials at the fast speed.
447 * Drop back to slow for the _next_ attempt */
448 fepriv->state = FESTATE_SEARCHING_SLOW;
449 fepriv->started_auto_step = fepriv->auto_step;
450 return;
451 }
452 fepriv->check_wrapped = 1;
453
454 /* if we've just retuned, enter the ZIGZAG_FAST state.
455 * This ensures we cannot return from an
456 * FE_SET_FRONTEND ioctl before the first frontend tune
457 * occurs */
458 if (fepriv->state & FESTATE_RETUNE) {
459 fepriv->state = FESTATE_TUNING_FAST;
460 }
461 }
462
463 /* slow zigzag */
464 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
465 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
466
467 /* Note: don't bother checking for wrapping; we stay in this
468 * state until we get a lock */
469 dvb_frontend_swzigzag_autotune(fe, 0);
470 }
471}
472
1da177e4
LT		 473static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
474{
0c53c70f 475 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 476
477 if (fepriv->exit)
478 return 1;
479
480 if (fepriv->dvbdev->writers == 1)
cc89c229 481 if (time_after(jiffies, fepriv->release_jiffies +
36cb557a 482 dvb_shutdown_timeout * HZ))
1da177e4
LT		 483 return 1;
484
485 return 0;
486}
487
488static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
489{
0c53c70f 490 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 491
492 if (fepriv->wakeup) {
493 fepriv->wakeup = 0;
494 return 1;
495 }
496 return dvb_frontend_is_exiting(fe);
497}
498
499static void dvb_frontend_wakeup(struct dvb_frontend *fe)
500{
0c53c70f 501 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 502
503 fepriv->wakeup = 1;
504 wake_up_interruptible(&fepriv->wait_queue);
505}
506
1da177e4
LT		 507static int dvb_frontend_thread(void *data)
508{
0c53c70f
JS		 509 struct dvb_frontend *fe = data;
510 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4 511 unsigned long timeout;
1da177e4 512 fe_status_t s;
36cb557a 513 struct dvb_frontend_parameters *params;
1da177e4
LT		 514
515 dprintk("%s\n", __FUNCTION__);
516
36cb557a
AQ		 517 fepriv->check_wrapped = 0;
518 fepriv->quality = 0;
519 fepriv->delay = 3*HZ;
1da177e4 520 fepriv->status = 0;
1da177e4 521 fepriv->wakeup = 0;
04c56d0e
AQ		 522 fepriv->reinitialise = 0;
523
524 dvb_frontend_init(fe);
1da177e4 525
83144186 526 set_freezable();
1da177e4
LT		 527 while (1) {
528 up(&fepriv->sem); /* is locked when we enter the thread... */
6591691b 529restart:
1da177e4 530 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
8eec1429
HP		 531 dvb_frontend_should_wakeup(fe) || kthread_should_stop(),
532 fepriv->delay);
533
534 if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
1da177e4
LT		 535 /* got signal or quitting */
536 break;
537 }
538
8eec1429 539 if (try_to_freeze())
6591691b 540 goto restart;
1da177e4
LT		 541
542 if (down_interruptible(&fepriv->sem))
543 break;
544
86f40cc3
AQ		 545 if (fepriv->reinitialise) {
546 dvb_frontend_init(fe);
64454016 547 if (fepriv->tone != -1) {
dea74869 548 fe->ops.set_tone(fe, fepriv->tone);
64454016
AQ		 549 }
550 if (fepriv->voltage != -1) {
dea74869 551 fe->ops.set_voltage(fe, fepriv->voltage);
64454016 552 }
86f40cc3
AQ		 553 fepriv->reinitialise = 0;
554 }
555
36cb557a 556 /* do an iteration of the tuning loop */
d772bd03
MA		 557 if (fe->ops.get_frontend_algo) {
558 if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
559 /* have we been asked to retune? */
560 params = NULL;
561 if (fepriv->state & FESTATE_RETUNE) {
562 params = &fepriv->parameters;
563 fepriv->state = FESTATE_TUNED;
564 }
565
566 fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
567 if (s != fepriv->status) {
568 dvb_frontend_add_event(fe, s);
569 fepriv->status = s;
570 }
70d90635
MA		 571 } else
572 dvb_frontend_swzigzag(fe);
4a4edcca
MA		 573 } else
574 dvb_frontend_swzigzag(fe);
1da177e4
LT		 575 }
576
577 if (dvb_shutdown_timeout) {
578 if (dvb_powerdown_on_sleep)
dea74869
PB		 579 if (fe->ops.set_voltage)
580 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
581 if (fe->ops.tuner_ops.sleep) {
582 fe->ops.tuner_ops.sleep(fe);
583 if (fe->ops.i2c_gate_ctrl)
584 fe->ops.i2c_gate_ctrl(fe, 0);
7eef5dd6 585 }
dea74869
PB		 586 if (fe->ops.sleep)
587 fe->ops.sleep(fe);
1da177e4
LT		 588 }
589
8eec1429 590 fepriv->thread = NULL;
1da177e4
LT		 591 mb();
592
593 dvb_frontend_wakeup(fe);
594 return 0;
595}
596
597static void dvb_frontend_stop(struct dvb_frontend *fe)
598{
0c53c70f 599 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 600
601 dprintk ("%s\n", __FUNCTION__);
602
603 fepriv->exit = 1;
604 mb();
605
8eec1429 606 if (!fepriv->thread)
1da177e4
LT		 607 return;
608
8eec1429 609 kthread_stop(fepriv->thread);
ca5be9cd 610
8eec1429 611 init_MUTEX (&fepriv->sem);
1da177e4
LT		 612 fepriv->state = FESTATE_IDLE;
613
614 /* paranoia check in case a signal arrived */
8eec1429
HP		 615 if (fepriv->thread)
616 printk("dvb_frontend_stop: warning: thread %p won't exit\n",
617 fepriv->thread);
1da177e4
LT		 618}
619
83b75b04
N		 620s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
621{
622 return ((curtime.tv_usec < lasttime.tv_usec) ?
623 1000000 - lasttime.tv_usec + curtime.tv_usec :
624 curtime.tv_usec - lasttime.tv_usec);
625}
626EXPORT_SYMBOL(timeval_usec_diff);
627
628static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
629{
630 curtime->tv_usec += add_usec;
631 if (curtime->tv_usec >= 1000000) {
632 curtime->tv_usec -= 1000000;
633 curtime->tv_sec++;
634 }
635}
636
637/*
638 * Sleep until gettimeofday() > waketime + add_usec
639 * This needs to be as precise as possible, but as the delay is
640 * usually between 2ms and 32ms, it is done using a scheduled msleep
641 * followed by usleep (normally a busy-wait loop) for the remainder
642 */
643void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
644{
645 struct timeval lasttime;
646 s32 delta, newdelta;
647
648 timeval_usec_add(waketime, add_usec);
649
650 do_gettimeofday(&lasttime);
651 delta = timeval_usec_diff(lasttime, *waketime);
652 if (delta > 2500) {
653 msleep((delta - 1500) / 1000);
654 do_gettimeofday(&lasttime);
655 newdelta = timeval_usec_diff(lasttime, *waketime);
656 delta = (newdelta > delta) ? 0 : newdelta;
657 }
658 if (delta > 0)
659 udelay(delta);
660}
661EXPORT_SYMBOL(dvb_frontend_sleep_until);
662
1da177e4
LT		 663static int dvb_frontend_start(struct dvb_frontend *fe)
664{
665 int ret;
0c53c70f 666 struct dvb_frontend_private *fepriv = fe->frontend_priv;
8eec1429 667 struct task_struct *fe_thread;
1da177e4
LT		 668
669 dprintk ("%s\n", __FUNCTION__);
670
8eec1429 671 if (fepriv->thread) {
1da177e4
LT		 672 if (!fepriv->exit)
673 return 0;
674 else
675 dvb_frontend_stop (fe);
676 }
677
678 if (signal_pending(current))
679 return -EINTR;
680 if (down_interruptible (&fepriv->sem))
681 return -EINTR;
682
683 fepriv->state = FESTATE_IDLE;
684 fepriv->exit = 0;
8eec1429 685 fepriv->thread = NULL;
1da177e4
LT		 686 mb();
687
8eec1429
HP		 688 fe_thread = kthread_run(dvb_frontend_thread, fe,
689 "kdvb-fe-%i", fe->dvb->num);
690 if (IS_ERR(fe_thread)) {
691 ret = PTR_ERR(fe_thread);
692 printk("dvb_frontend_start: failed to start kthread (%d)\n", ret);
1da177e4
LT		 693 up(&fepriv->sem);
694 return ret;
695 }
8eec1429 696 fepriv->thread = fe_thread;
1da177e4
LT		 697 return 0;
698}
699
700static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
701 unsigned int cmd, void *parg)
702{
703 struct dvb_device *dvbdev = file->private_data;
704 struct dvb_frontend *fe = dvbdev->priv;
0c53c70f 705 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 706 int err = -EOPNOTSUPP;
707
708 dprintk ("%s\n", __FUNCTION__);
709
710 if (!fe || fepriv->exit)
711 return -ENODEV;
712
713 if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
714 (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
715 cmd == FE_DISEQC_RECV_SLAVE_REPLY))
716 return -EPERM;
717
718 if (down_interruptible (&fepriv->sem))
719 return -ERESTARTSYS;
720
721 switch (cmd) {
722 case FE_GET_INFO: {
0c53c70f 723 struct dvb_frontend_info* info = parg;
dea74869 724 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
1da177e4
LT		 725
726 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
727 * do it, it is done for it. */
728 info->caps |= FE_CAN_INVERSION_AUTO;
729 err = 0;
730 break;
731 }
732
6757ccc5
PB		 733 case FE_READ_STATUS: {
734 fe_status_t* status = parg;
735
736 /* if retune was requested but hasn't occured yet, prevent
737 * that user get signal state from previous tuning */
738 if(fepriv->state == FESTATE_RETUNE) {
739 err=0;
740 *status = 0;
741 break;
742 }
743
dea74869
PB		 744 if (fe->ops.read_status)
745 err = fe->ops.read_status(fe, status);
1da177e4 746 break;
6757ccc5 747 }
1da177e4 748 case FE_READ_BER:
dea74869
PB		 749 if (fe->ops.read_ber)
750 err = fe->ops.read_ber(fe, (__u32*) parg);
1da177e4
LT		 751 break;
752
753 case FE_READ_SIGNAL_STRENGTH:
dea74869
PB		 754 if (fe->ops.read_signal_strength)
755 err = fe->ops.read_signal_strength(fe, (__u16*) parg);
1da177e4
LT		 756 break;
757
758 case FE_READ_SNR:
dea74869
PB		 759 if (fe->ops.read_snr)
760 err = fe->ops.read_snr(fe, (__u16*) parg);
1da177e4
LT		 761 break;
762
763 case FE_READ_UNCORRECTED_BLOCKS:
dea74869
PB		 764 if (fe->ops.read_ucblocks)
765 err = fe->ops.read_ucblocks(fe, (__u32*) parg);
1da177e4
LT		 766 break;
767
768
769 case FE_DISEQC_RESET_OVERLOAD:
dea74869
PB		 770 if (fe->ops.diseqc_reset_overload) {
771 err = fe->ops.diseqc_reset_overload(fe);
1da177e4
LT		 772 fepriv->state = FESTATE_DISEQC;
773 fepriv->status = 0;
774 }
775 break;
776
777 case FE_DISEQC_SEND_MASTER_CMD:
dea74869
PB		 778 if (fe->ops.diseqc_send_master_cmd) {
779 err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
1da177e4
LT		 780 fepriv->state = FESTATE_DISEQC;
781 fepriv->status = 0;
782 }
783 break;
784
785 case FE_DISEQC_SEND_BURST:
dea74869
PB		 786 if (fe->ops.diseqc_send_burst) {
787 err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
1da177e4
LT		 788 fepriv->state = FESTATE_DISEQC;
789 fepriv->status = 0;
790 }
791 break;
792
793 case FE_SET_TONE:
dea74869
PB		 794 if (fe->ops.set_tone) {
795 err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
64454016 796 fepriv->tone = (fe_sec_tone_mode_t) parg;
1da177e4
LT		 797 fepriv->state = FESTATE_DISEQC;
798 fepriv->status = 0;
799 }
800 break;
801
802 case FE_SET_VOLTAGE:
dea74869
PB		 803 if (fe->ops.set_voltage) {
804 err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
64454016 805 fepriv->voltage = (fe_sec_voltage_t) parg;
1da177e4
LT		 806 fepriv->state = FESTATE_DISEQC;
807 fepriv->status = 0;
808 }
809 break;
810
811 case FE_DISHNETWORK_SEND_LEGACY_CMD:
dea74869
PB		 812 if (fe->ops.dishnetwork_send_legacy_command) {
813 err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
1da177e4
LT		 814 fepriv->state = FESTATE_DISEQC;
815 fepriv->status = 0;
dea74869 816 } else if (fe->ops.set_voltage) {
83b75b04
N		 817 /*
818 * NOTE: This is a fallback condition. Some frontends
819 * (stv0299 for instance) take longer than 8msec to
820 * respond to a set_voltage command. Those switches
821 * need custom routines to switch properly. For all
822 * other frontends, the following shoule work ok.
823 * Dish network legacy switches (as used by Dish500)
824 * are controlled by sending 9-bit command words
825 * spaced 8msec apart.
826 * the actual command word is switch/port dependant
827 * so it is up to the userspace application to send
828 * the right command.
829 * The command must always start with a '0' after
830 * initialization, so parg is 8 bits and does not
831 * include the initialization or start bit
832 */
400b7083 833 unsigned long cmd = ((unsigned long) parg) << 1;
83b75b04
N		 834 struct timeval nexttime;
835 struct timeval tv[10];
836 int i;
837 u8 last = 1;
838 if (dvb_frontend_debug)
400b7083 839 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
83b75b04
N		 840 do_gettimeofday(&nexttime);
841 if (dvb_frontend_debug)
842 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
843 /* before sending a command, initialize by sending
844 * a 32ms 18V to the switch
845 */
dea74869 846 fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
83b75b04
N		 847 dvb_frontend_sleep_until(&nexttime, 32000);
848
849 for (i = 0; i < 9; i++) {
850 if (dvb_frontend_debug)
851 do_gettimeofday(&tv[i + 1]);
852 if ((cmd & 0x01) != last) {
853 /* set voltage to (last ? 13V : 18V) */
dea74869 854 fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
83b75b04
N		 855 last = (last) ? 0 : 1;
856 }
857 cmd = cmd >> 1;
858 if (i != 8)
859 dvb_frontend_sleep_until(&nexttime, 8000);
860 }
861 if (dvb_frontend_debug) {
862 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
863 __FUNCTION__, fe->dvb->num);
864 for (i = 1; i < 10; i++)
865 printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
866 }
867 err = 0;
868 fepriv->state = FESTATE_DISEQC;
869 fepriv->status = 0;
1da177e4
LT		 870 }
871 break;
872
873 case FE_DISEQC_RECV_SLAVE_REPLY:
dea74869
PB		 874 if (fe->ops.diseqc_recv_slave_reply)
875 err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
1da177e4
LT		 876 break;
877
878 case FE_ENABLE_HIGH_LNB_VOLTAGE:
dea74869
PB		 879 if (fe->ops.enable_high_lnb_voltage)
880 err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
1da177e4
LT		 881 break;
882
883 case FE_SET_FRONTEND: {
884 struct dvb_frontend_tune_settings fetunesettings;
885
886 memcpy (&fepriv->parameters, parg,
887 sizeof (struct dvb_frontend_parameters));
888
889 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
890 memcpy(&fetunesettings.parameters, parg,
891 sizeof (struct dvb_frontend_parameters));
892
893 /* force auto frequency inversion if requested */
894 if (dvb_force_auto_inversion) {
895 fepriv->parameters.inversion = INVERSION_AUTO;
896 fetunesettings.parameters.inversion = INVERSION_AUTO;
897 }
dea74869 898 if (fe->ops.info.type == FE_OFDM) {
1b3c3714 899 /* without hierarchical coding code_rate_LP is irrelevant,
1da177e4
LT		 900 * so we tolerate the otherwise invalid FEC_NONE setting */
901 if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
902 fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
903 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
904 }
905
906 /* get frontend-specific tuning settings */
dea74869 907 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
1da177e4
LT		 908 fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
909 fepriv->max_drift = fetunesettings.max_drift;
910 fepriv->step_size = fetunesettings.step_size;
911 } else {
912 /* default values */
dea74869 913 switch(fe->ops.info.type) {
1da177e4
LT		 914 case FE_QPSK:
915 fepriv->min_delay = HZ/20;
916 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
917 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
918 break;
919
920 case FE_QAM:
921 fepriv->min_delay = HZ/20;
922 fepriv->step_size = 0; /* no zigzag */
923 fepriv->max_drift = 0;
924 break;
925
926 case FE_OFDM:
927 fepriv->min_delay = HZ/20;
dea74869
PB		 928 fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
929 fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
1da177e4
LT		 930 break;
931 case FE_ATSC:
4821fb1d
MA		 932 fepriv->min_delay = HZ/20;
933 fepriv->step_size = 0;
934 fepriv->max_drift = 0;
1da177e4
LT		 935 break;
936 }
937 }
938 if (dvb_override_tune_delay > 0)
939 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
940
941 fepriv->state = FESTATE_RETUNE;
942 dvb_frontend_wakeup(fe);
943 dvb_frontend_add_event(fe, 0);
944 fepriv->status = 0;
945 err = 0;
946 break;
947 }
948
949 case FE_GET_EVENT:
950 err = dvb_frontend_get_event (fe, parg, file->f_flags);
951 break;
952
953 case FE_GET_FRONTEND:
dea74869 954 if (fe->ops.get_frontend) {
1da177e4 955 memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
dea74869 956 err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
1da177e4
LT		 957 }
958 break;
36cb557a
AQ		 959
960 case FE_SET_FRONTEND_TUNE_MODE:
e18828e4 961 fepriv->tune_mode_flags = (unsigned long) parg;
1b172e0c 962 err = 0;
36cb557a 963 break;
1da177e4
LT		 964 };
965
966 up (&fepriv->sem);
967 return err;
968}
969
970static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
971{
972 struct dvb_device *dvbdev = file->private_data;
973 struct dvb_frontend *fe = dvbdev->priv;
0c53c70f 974 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 975
976 dprintk ("%s\n", __FUNCTION__);
977
978 poll_wait (file, &fepriv->events.wait_queue, wait);
979
980 if (fepriv->events.eventw != fepriv->events.eventr)
981 return (POLLIN | POLLRDNORM | POLLPRI);
982
983 return 0;
984}
985
986static int dvb_frontend_open(struct inode *inode, struct file *file)
987{
988 struct dvb_device *dvbdev = file->private_data;
989 struct dvb_frontend *fe = dvbdev->priv;
0c53c70f 990 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 991 int ret;
992
993 dprintk ("%s\n", __FUNCTION__);
994
995 if ((ret = dvb_generic_open (inode, file)) < 0)
996 return ret;
997
ba7e6f3e
ST		 998 if (fe->ops.ts_bus_ctrl) {
999 if ((ret = fe->ops.ts_bus_ctrl (fe, 1)) < 0) {
1000 dvb_generic_release (inode, file);
1001 return ret;
1002 }
1003 }
1004
1da177e4 1005 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
04c56d0e
AQ		 1006
1007 /* normal tune mode when opened R/W */
1008 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
1009 fepriv->tone = -1;
1010 fepriv->voltage = -1;
1011
1da177e4
LT		 1012 ret = dvb_frontend_start (fe);
1013 if (ret)
1014 dvb_generic_release (inode, file);
1015
1016 /* empty event queue */
1017 fepriv->events.eventr = fepriv->events.eventw = 0;
1018 }
1019
1020 return ret;
1021}
1022
1023static int dvb_frontend_release(struct inode *inode, struct file *file)
1024{
1025 struct dvb_device *dvbdev = file->private_data;
1026 struct dvb_frontend *fe = dvbdev->priv;
0c53c70f 1027 struct dvb_frontend_private *fepriv = fe->frontend_priv;
ca5be9cd 1028 int ret;
1da177e4
LT		 1029
1030 dprintk ("%s\n", __FUNCTION__);
1031
1032 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1033 fepriv->release_jiffies = jiffies;
1034
ba7e6f3e
ST		 1035 if (fe->ops.ts_bus_ctrl)
1036 fe->ops.ts_bus_ctrl (fe, 0);
1037
ca5be9cd
MR		 1038 ret = dvb_generic_release (inode, file);
1039
1040 if (dvbdev->users==-1 && fepriv->exit==1) {
1041 fops_put(file->f_op);
1042 file->f_op = NULL;
57861b43 1043 wake_up(&dvbdev->wait_queue);
ca5be9cd
MR		 1044 }
1045 return ret;
1da177e4
LT		 1046}
1047
1048static struct file_operations dvb_frontend_fops = {
1049 .owner = THIS_MODULE,
1050 .ioctl = dvb_generic_ioctl,
1051 .poll = dvb_frontend_poll,
1052 .open = dvb_frontend_open,
1053 .release = dvb_frontend_release
1054};
1055
1056int dvb_register_frontend(struct dvb_adapter* dvb,
1057 struct dvb_frontend* fe)
1058{
1059 struct dvb_frontend_private *fepriv;
1060 static const struct dvb_device dvbdev_template = {
1061 .users = ~0,
1062 .writers = 1,
1063 .readers = (~0)-1,
1064 .fops = &dvb_frontend_fops,
1065 .kernel_ioctl = dvb_frontend_ioctl
1066 };
1067
1068 dprintk ("%s\n", __FUNCTION__);
1069
3593cab5 1070 if (mutex_lock_interruptible(&frontend_mutex))
1da177e4
LT		 1071 return -ERESTARTSYS;
1072
7408187d 1073 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1da177e4 1074 if (fe->frontend_priv == NULL) {
3593cab5 1075 mutex_unlock(&frontend_mutex);
1da177e4
LT		 1076 return -ENOMEM;
1077 }
0c53c70f 1078 fepriv = fe->frontend_priv;
1da177e4
LT		 1079
1080 init_MUTEX (&fepriv->sem);
1081 init_waitqueue_head (&fepriv->wait_queue);
1082 init_waitqueue_head (&fepriv->events.wait_queue);
1083 init_MUTEX (&fepriv->events.sem);
1084 fe->dvb = dvb;
1085 fepriv->inversion = INVERSION_OFF;
1086
1087 printk ("DVB: registering frontend %i (%s)...\n",
1088 fe->dvb->num,
dea74869 1089 fe->ops.info.name);
1da177e4
LT		 1090
1091 dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1092 fe, DVB_DEVICE_FRONTEND);
1093
3593cab5 1094 mutex_unlock(&frontend_mutex);
1da177e4
LT		 1095 return 0;
1096}
1097EXPORT_SYMBOL(dvb_register_frontend);
1098
1099int dvb_unregister_frontend(struct dvb_frontend* fe)
1100{
0c53c70f 1101 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1da177e4
LT		 1102 dprintk ("%s\n", __FUNCTION__);
1103
57861b43 1104 mutex_lock(&frontend_mutex);
ca5be9cd 1105 dvb_frontend_stop (fe);
57861b43
MR		 1106 mutex_unlock(&frontend_mutex);
1107
1108 if (fepriv->dvbdev->users < -1)
1109 wait_event(fepriv->dvbdev->wait_queue,
1110 fepriv->dvbdev->users==-1);
1111
3593cab5 1112 mutex_lock(&frontend_mutex);
1da177e4 1113 dvb_unregister_device (fepriv->dvbdev);
d9955060 1114
1da177e4
LT		 1115 /* fe is invalid now */
1116 kfree(fepriv);
3593cab5 1117 mutex_unlock(&frontend_mutex);
1da177e4
LT		 1118 return 0;
1119}
1120EXPORT_SYMBOL(dvb_unregister_frontend);
f52a838b 1121
7df0994d 1122#ifdef CONFIG_DVB_CORE_ATTACH
f52a838b
AQ		 1123void dvb_frontend_detach(struct dvb_frontend* fe)
1124{
1125 void *ptr;
1126
1127 if (fe->ops.release_sec) {
1128 fe->ops.release_sec(fe);
1129 symbol_put_addr(fe->ops.release_sec);
1130 }
1131 if (fe->ops.tuner_ops.release) {
1132 fe->ops.tuner_ops.release(fe);
1133 symbol_put_addr(fe->ops.tuner_ops.release);
1134 }
1135 ptr = (void*)fe->ops.release;
1136 if (ptr) {
1137 fe->ops.release(fe);
1138 symbol_put_addr(ptr);
1139 }
1140}
1141#else
1142void dvb_frontend_detach(struct dvb_frontend* fe)
1143{
1144 if (fe->ops.release_sec)
1145 fe->ops.release_sec(fe);
1146 if (fe->ops.tuner_ops.release)
1147 fe->ops.tuner_ops.release(fe);
1148 if (fe->ops.release)
1149 fe->ops.release(fe);
1150}
1151#endif
1152EXPORT_SYMBOL(dvb_frontend_detach);
Linux 6.x block layer and io_uring tree(s)