[PATCH] Add include/linux/freezer.h and move definitions from sched.h
[linux-2.6.git] / drivers / media / dvb / dvb-core / dvb_frontend.c
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>
37 #include <linux/freezer.h>
38 #include <linux/jiffies.h>
39 #include <asm/processor.h>
40
41 #include "dvb_frontend.h"
42 #include "dvbdev.h"
43
44 static int dvb_frontend_debug;
45 static int dvb_shutdown_timeout = 5;
46 static int dvb_force_auto_inversion;
47 static int dvb_override_tune_delay;
48 static int dvb_powerdown_on_sleep = 1;
49
50 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
51 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
52 module_param(dvb_shutdown_timeout, int, 0644);
53 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
54 module_param(dvb_force_auto_inversion, int, 0644);
55 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
56 module_param(dvb_override_tune_delay, int, 0644);
57 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
58 module_param(dvb_powerdown_on_sleep, int, 0644);
59 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
60
61 #define dprintk if (dvb_frontend_debug) printk
62
63 #define FESTATE_IDLE 1
64 #define FESTATE_RETUNE 2
65 #define FESTATE_TUNING_FAST 4
66 #define FESTATE_TUNING_SLOW 8
67 #define FESTATE_TUNED 16
68 #define FESTATE_ZIGZAG_FAST 32
69 #define FESTATE_ZIGZAG_SLOW 64
70 #define FESTATE_DISEQC 128
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 #define FE_ALGO_HW              1
77 /*
78  * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
79  * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
80  * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
81  * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
82  * FESTATE_TUNED. The frontend has successfully locked on.
83  * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
84  * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
85  * FESTATE_DISEQC. A DISEQC command has just been issued.
86  * FESTATE_WAITFORLOCK. When we're waiting for a lock.
87  * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
88  * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
89  * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
90  */
91
92 static DEFINE_MUTEX(frontend_mutex);
93
94 struct dvb_frontend_private {
95
96         /* thread/frontend values */
97         struct dvb_device *dvbdev;
98         struct dvb_frontend_parameters parameters;
99         struct dvb_fe_events events;
100         struct semaphore sem;
101         struct list_head list_head;
102         wait_queue_head_t wait_queue;
103         pid_t thread_pid;
104         unsigned long release_jiffies;
105         unsigned int exit;
106         unsigned int wakeup;
107         fe_status_t status;
108         unsigned long tune_mode_flags;
109         unsigned int delay;
110         unsigned int reinitialise;
111         int tone;
112         int voltage;
113
114         /* swzigzag values */
115         unsigned int state;
116         unsigned int bending;
117         int lnb_drift;
118         unsigned int inversion;
119         unsigned int auto_step;
120         unsigned int auto_sub_step;
121         unsigned int started_auto_step;
122         unsigned int min_delay;
123         unsigned int max_drift;
124         unsigned int step_size;
125         int quality;
126         unsigned int check_wrapped;
127 };
128
129 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
130
131 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
132 {
133         struct dvb_frontend_private *fepriv = fe->frontend_priv;
134         struct dvb_fe_events *events = &fepriv->events;
135         struct dvb_frontend_event *e;
136         int wp;
137
138         dprintk ("%s\n", __FUNCTION__);
139
140         if (down_interruptible (&events->sem))
141                 return;
142
143         wp = (events->eventw + 1) % MAX_EVENT;
144
145         if (wp == events->eventr) {
146                 events->overflow = 1;
147                 events->eventr = (events->eventr + 1) % MAX_EVENT;
148         }
149
150         e = &events->events[events->eventw];
151
152         memcpy (&e->parameters, &fepriv->parameters,
153                 sizeof (struct dvb_frontend_parameters));
154
155         if (status & FE_HAS_LOCK)
156                 if (fe->ops.get_frontend)
157                         fe->ops.get_frontend(fe, &e->parameters);
158
159         events->eventw = wp;
160
161         up (&events->sem);
162
163         e->status = status;
164
165         wake_up_interruptible (&events->wait_queue);
166 }
167
168 static int dvb_frontend_get_event(struct dvb_frontend *fe,
169                             struct dvb_frontend_event *event, int flags)
170 {
171         struct dvb_frontend_private *fepriv = fe->frontend_priv;
172         struct dvb_fe_events *events = &fepriv->events;
173
174         dprintk ("%s\n", __FUNCTION__);
175
176         if (events->overflow) {
177                 events->overflow = 0;
178                 return -EOVERFLOW;
179         }
180
181         if (events->eventw == events->eventr) {
182                 int ret;
183
184                 if (flags & O_NONBLOCK)
185                         return -EWOULDBLOCK;
186
187                 up(&fepriv->sem);
188
189                 ret = wait_event_interruptible (events->wait_queue,
190                                                 events->eventw != events->eventr);
191
192                 if (down_interruptible (&fepriv->sem))
193                         return -ERESTARTSYS;
194
195                 if (ret < 0)
196                         return ret;
197         }
198
199         if (down_interruptible (&events->sem))
200                 return -ERESTARTSYS;
201
202         memcpy (event, &events->events[events->eventr],
203                 sizeof(struct dvb_frontend_event));
204
205         events->eventr = (events->eventr + 1) % MAX_EVENT;
206
207         up (&events->sem);
208
209         return 0;
210 }
211
212 static void dvb_frontend_init(struct dvb_frontend *fe)
213 {
214         dprintk ("DVB: initialising frontend %i (%s)...\n",
215                  fe->dvb->num,
216                  fe->ops.info.name);
217
218         if (fe->ops.init)
219                 fe->ops.init(fe);
220         if (fe->ops.tuner_ops.init) {
221                 fe->ops.tuner_ops.init(fe);
222                 if (fe->ops.i2c_gate_ctrl)
223                         fe->ops.i2c_gate_ctrl(fe, 0);
224         }
225 }
226
227 void dvb_frontend_reinitialise(struct dvb_frontend *fe)
228 {
229         struct dvb_frontend_private *fepriv = fe->frontend_priv;
230
231         fepriv->reinitialise = 1;
232         dvb_frontend_wakeup(fe);
233 }
234 EXPORT_SYMBOL(dvb_frontend_reinitialise);
235
236 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
237 {
238         int q2;
239
240         dprintk ("%s\n", __FUNCTION__);
241
242         if (locked)
243                 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
244         else
245                 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
246
247         q2 = fepriv->quality - 128;
248         q2 *= q2;
249
250         fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
251 }
252
253 /**
254  * Performs automatic twiddling of frontend parameters.
255  *
256  * @param fe The frontend concerned.
257  * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
258  * @returns Number of complete iterations that have been performed.
259  */
260 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
261 {
262         int autoinversion;
263         int ready = 0;
264         struct dvb_frontend_private *fepriv = fe->frontend_priv;
265         int original_inversion = fepriv->parameters.inversion;
266         u32 original_frequency = fepriv->parameters.frequency;
267
268         /* are we using autoinversion? */
269         autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
270                          (fepriv->parameters.inversion == INVERSION_AUTO));
271
272         /* setup parameters correctly */
273         while(!ready) {
274                 /* calculate the lnb_drift */
275                 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
276
277                 /* wrap the auto_step if we've exceeded the maximum drift */
278                 if (fepriv->lnb_drift > fepriv->max_drift) {
279                         fepriv->auto_step = 0;
280                         fepriv->auto_sub_step = 0;
281                         fepriv->lnb_drift = 0;
282                 }
283
284                 /* perform inversion and +/- zigzag */
285                 switch(fepriv->auto_sub_step) {
286                 case 0:
287                         /* try with the current inversion and current drift setting */
288                         ready = 1;
289                         break;
290
291                 case 1:
292                         if (!autoinversion) break;
293
294                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
295                         ready = 1;
296                         break;
297
298                 case 2:
299                         if (fepriv->lnb_drift == 0) break;
300
301                         fepriv->lnb_drift = -fepriv->lnb_drift;
302                         ready = 1;
303                         break;
304
305                 case 3:
306                         if (fepriv->lnb_drift == 0) break;
307                         if (!autoinversion) break;
308
309                         fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
310                         fepriv->lnb_drift = -fepriv->lnb_drift;
311                         ready = 1;
312                         break;
313
314                 default:
315                         fepriv->auto_step++;
316                         fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
317                         break;
318                 }
319
320                 if (!ready) fepriv->auto_sub_step++;
321         }
322
323         /* if this attempt would hit where we started, indicate a complete
324          * iteration has occurred */
325         if ((fepriv->auto_step == fepriv->started_auto_step) &&
326             (fepriv->auto_sub_step == 0) && check_wrapped) {
327                 return 1;
328         }
329
330         dprintk("%s: drift:%i inversion:%i auto_step:%i "
331                 "auto_sub_step:%i started_auto_step:%i\n",
332                 __FUNCTION__, fepriv->lnb_drift, fepriv->inversion,
333                 fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step);
334
335         /* set the frontend itself */
336         fepriv->parameters.frequency += fepriv->lnb_drift;
337         if (autoinversion)
338                 fepriv->parameters.inversion = fepriv->inversion;
339         if (fe->ops.set_frontend)
340                 fe->ops.set_frontend(fe, &fepriv->parameters);
341
342         fepriv->parameters.frequency = original_frequency;
343         fepriv->parameters.inversion = original_inversion;
344
345         fepriv->auto_sub_step++;
346         return 0;
347 }
348
349 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
350 {
351         fe_status_t s = 0;
352         struct dvb_frontend_private *fepriv = fe->frontend_priv;
353
354         /* if we've got no parameters, just keep idling */
355         if (fepriv->state & FESTATE_IDLE) {
356                 fepriv->delay = 3*HZ;
357                 fepriv->quality = 0;
358                 return;
359         }
360
361         /* in SCAN mode, we just set the frontend when asked and leave it alone */
362         if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
363                 if (fepriv->state & FESTATE_RETUNE) {
364                         if (fe->ops.set_frontend)
365                                 fe->ops.set_frontend(fe, &fepriv->parameters);
366                         fepriv->state = FESTATE_TUNED;
367                 }
368                 fepriv->delay = 3*HZ;
369                 fepriv->quality = 0;
370                 return;
371         }
372
373         /* get the frontend status */
374         if (fepriv->state & FESTATE_RETUNE) {
375                 s = 0;
376         } else {
377                 if (fe->ops.read_status)
378                         fe->ops.read_status(fe, &s);
379                 if (s != fepriv->status) {
380                         dvb_frontend_add_event(fe, s);
381                         fepriv->status = s;
382                 }
383         }
384
385         /* if we're not tuned, and we have a lock, move to the TUNED state */
386         if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
387                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
388                 fepriv->state = FESTATE_TUNED;
389
390                 /* if we're tuned, then we have determined the correct inversion */
391                 if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) &&
392                     (fepriv->parameters.inversion == INVERSION_AUTO)) {
393                         fepriv->parameters.inversion = fepriv->inversion;
394                 }
395                 return;
396         }
397
398         /* if we are tuned already, check we're still locked */
399         if (fepriv->state & FESTATE_TUNED) {
400                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
401
402                 /* we're tuned, and the lock is still good... */
403                 if (s & FE_HAS_LOCK) {
404                         return;
405                 } else { /* if we _WERE_ tuned, but now don't have a lock */
406                         fepriv->state = FESTATE_ZIGZAG_FAST;
407                         fepriv->started_auto_step = fepriv->auto_step;
408                         fepriv->check_wrapped = 0;
409                 }
410         }
411
412         /* don't actually do anything if we're in the LOSTLOCK state,
413          * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */
414         if ((fepriv->state & FESTATE_LOSTLOCK) &&
415             (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) {
416                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
417                 return;
418         }
419
420         /* don't do anything if we're in the DISEQC state, since this
421          * might be someone with a motorized dish controlled by DISEQC.
422          * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */
423         if (fepriv->state & FESTATE_DISEQC) {
424                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
425                 return;
426         }
427
428         /* if we're in the RETUNE state, set everything up for a brand
429          * new scan, keeping the current inversion setting, as the next
430          * tune is _very_ likely to require the same */
431         if (fepriv->state & FESTATE_RETUNE) {
432                 fepriv->lnb_drift = 0;
433                 fepriv->auto_step = 0;
434                 fepriv->auto_sub_step = 0;
435                 fepriv->started_auto_step = 0;
436                 fepriv->check_wrapped = 0;
437         }
438
439         /* fast zigzag. */
440         if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
441                 fepriv->delay = fepriv->min_delay;
442
443                 /* peform a tune */
444                 if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
445                         /* OK, if we've run out of trials at the fast speed.
446                          * Drop back to slow for the _next_ attempt */
447                         fepriv->state = FESTATE_SEARCHING_SLOW;
448                         fepriv->started_auto_step = fepriv->auto_step;
449                         return;
450                 }
451                 fepriv->check_wrapped = 1;
452
453                 /* if we've just retuned, enter the ZIGZAG_FAST state.
454                  * This ensures we cannot return from an
455                  * FE_SET_FRONTEND ioctl before the first frontend tune
456                  * occurs */
457                 if (fepriv->state & FESTATE_RETUNE) {
458                         fepriv->state = FESTATE_TUNING_FAST;
459                 }
460         }
461
462         /* slow zigzag */
463         if (fepriv->state & FESTATE_SEARCHING_SLOW) {
464                 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
465
466                 /* Note: don't bother checking for wrapping; we stay in this
467                  * state until we get a lock */
468                 dvb_frontend_swzigzag_autotune(fe, 0);
469         }
470 }
471
472 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
473 {
474         struct dvb_frontend_private *fepriv = fe->frontend_priv;
475
476         if (fepriv->exit)
477                 return 1;
478
479         if (fepriv->dvbdev->writers == 1)
480                 if (time_after(jiffies, fepriv->release_jiffies +
481                                   dvb_shutdown_timeout * HZ))
482                         return 1;
483
484         return 0;
485 }
486
487 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
488 {
489         struct dvb_frontend_private *fepriv = fe->frontend_priv;
490
491         if (fepriv->wakeup) {
492                 fepriv->wakeup = 0;
493                 return 1;
494         }
495         return dvb_frontend_is_exiting(fe);
496 }
497
498 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
499 {
500         struct dvb_frontend_private *fepriv = fe->frontend_priv;
501
502         fepriv->wakeup = 1;
503         wake_up_interruptible(&fepriv->wait_queue);
504 }
505
506 static int dvb_frontend_thread(void *data)
507 {
508         struct dvb_frontend *fe = data;
509         struct dvb_frontend_private *fepriv = fe->frontend_priv;
510         unsigned long timeout;
511         char name [15];
512         fe_status_t s;
513         struct dvb_frontend_parameters *params;
514
515         dprintk("%s\n", __FUNCTION__);
516
517         snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num);
518
519         lock_kernel();
520         daemonize(name);
521         sigfillset(&current->blocked);
522         unlock_kernel();
523
524         fepriv->check_wrapped = 0;
525         fepriv->quality = 0;
526         fepriv->delay = 3*HZ;
527         fepriv->status = 0;
528         fepriv->wakeup = 0;
529         fepriv->reinitialise = 0;
530
531         dvb_frontend_init(fe);
532
533         while (1) {
534                 up(&fepriv->sem);           /* is locked when we enter the thread... */
535
536                 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
537                                                            dvb_frontend_should_wakeup(fe),
538                                                            fepriv->delay);
539                 if (0 != dvb_frontend_is_exiting(fe)) {
540                         /* got signal or quitting */
541                         break;
542                 }
543
544                 try_to_freeze();
545
546                 if (down_interruptible(&fepriv->sem))
547                         break;
548
549                 if (fepriv->reinitialise) {
550                         dvb_frontend_init(fe);
551                         if (fepriv->tone != -1) {
552                                 fe->ops.set_tone(fe, fepriv->tone);
553                         }
554                         if (fepriv->voltage != -1) {
555                                 fe->ops.set_voltage(fe, fepriv->voltage);
556                         }
557                         fepriv->reinitialise = 0;
558                 }
559
560                 /* do an iteration of the tuning loop */
561                 if (fe->ops.get_frontend_algo) {
562                         if (fe->ops.get_frontend_algo(fe) == FE_ALGO_HW) {
563                                 /* have we been asked to retune? */
564                                 params = NULL;
565                                 if (fepriv->state & FESTATE_RETUNE) {
566                                         params = &fepriv->parameters;
567                                         fepriv->state = FESTATE_TUNED;
568                                 }
569
570                                 fe->ops.tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
571                                 if (s != fepriv->status) {
572                                         dvb_frontend_add_event(fe, s);
573                                         fepriv->status = s;
574                                 }
575                         } else
576                                 dvb_frontend_swzigzag(fe);
577                 } else
578                         dvb_frontend_swzigzag(fe);
579         }
580
581         if (dvb_shutdown_timeout) {
582                 if (dvb_powerdown_on_sleep)
583                         if (fe->ops.set_voltage)
584                                 fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
585                 if (fe->ops.tuner_ops.sleep) {
586                         fe->ops.tuner_ops.sleep(fe);
587                         if (fe->ops.i2c_gate_ctrl)
588                                 fe->ops.i2c_gate_ctrl(fe, 0);
589                 }
590                 if (fe->ops.sleep)
591                         fe->ops.sleep(fe);
592         }
593
594         fepriv->thread_pid = 0;
595         mb();
596
597         dvb_frontend_wakeup(fe);
598         return 0;
599 }
600
601 static void dvb_frontend_stop(struct dvb_frontend *fe)
602 {
603         unsigned long ret;
604         struct dvb_frontend_private *fepriv = fe->frontend_priv;
605
606         dprintk ("%s\n", __FUNCTION__);
607
608         fepriv->exit = 1;
609         mb();
610
611         if (!fepriv->thread_pid)
612                 return;
613
614         /* check if the thread is really alive */
615         if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) {
616                 printk("dvb_frontend_stop: thread PID %d already died\n",
617                                 fepriv->thread_pid);
618                 /* make sure the mutex was not held by the thread */
619                 init_MUTEX (&fepriv->sem);
620                 return;
621         }
622
623         /* wake up the frontend thread, so it notices that fe->exit == 1 */
624         dvb_frontend_wakeup(fe);
625
626         /* wait until the frontend thread has exited */
627         ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid);
628         if (-ERESTARTSYS != ret) {
629                 fepriv->state = FESTATE_IDLE;
630                 return;
631         }
632         fepriv->state = FESTATE_IDLE;
633
634         /* paranoia check in case a signal arrived */
635         if (fepriv->thread_pid)
636                 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
637                                 fepriv->thread_pid);
638 }
639
640 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
641 {
642         return ((curtime.tv_usec < lasttime.tv_usec) ?
643                 1000000 - lasttime.tv_usec + curtime.tv_usec :
644                 curtime.tv_usec - lasttime.tv_usec);
645 }
646 EXPORT_SYMBOL(timeval_usec_diff);
647
648 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
649 {
650         curtime->tv_usec += add_usec;
651         if (curtime->tv_usec >= 1000000) {
652                 curtime->tv_usec -= 1000000;
653                 curtime->tv_sec++;
654         }
655 }
656
657 /*
658  * Sleep until gettimeofday() > waketime + add_usec
659  * This needs to be as precise as possible, but as the delay is
660  * usually between 2ms and 32ms, it is done using a scheduled msleep
661  * followed by usleep (normally a busy-wait loop) for the remainder
662  */
663 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
664 {
665         struct timeval lasttime;
666         s32 delta, newdelta;
667
668         timeval_usec_add(waketime, add_usec);
669
670         do_gettimeofday(&lasttime);
671         delta = timeval_usec_diff(lasttime, *waketime);
672         if (delta > 2500) {
673                 msleep((delta - 1500) / 1000);
674                 do_gettimeofday(&lasttime);
675                 newdelta = timeval_usec_diff(lasttime, *waketime);
676                 delta = (newdelta > delta) ? 0 : newdelta;
677         }
678         if (delta > 0)
679                 udelay(delta);
680 }
681 EXPORT_SYMBOL(dvb_frontend_sleep_until);
682
683 static int dvb_frontend_start(struct dvb_frontend *fe)
684 {
685         int ret;
686         struct dvb_frontend_private *fepriv = fe->frontend_priv;
687
688         dprintk ("%s\n", __FUNCTION__);
689
690         if (fepriv->thread_pid) {
691                 if (!fepriv->exit)
692                         return 0;
693                 else
694                         dvb_frontend_stop (fe);
695         }
696
697         if (signal_pending(current))
698                 return -EINTR;
699         if (down_interruptible (&fepriv->sem))
700                 return -EINTR;
701
702         fepriv->state = FESTATE_IDLE;
703         fepriv->exit = 0;
704         fepriv->thread_pid = 0;
705         mb();
706
707         ret = kernel_thread (dvb_frontend_thread, fe, 0);
708
709         if (ret < 0) {
710                 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
711                 up(&fepriv->sem);
712                 return ret;
713         }
714         fepriv->thread_pid = ret;
715
716         return 0;
717 }
718
719 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
720                         unsigned int cmd, void *parg)
721 {
722         struct dvb_device *dvbdev = file->private_data;
723         struct dvb_frontend *fe = dvbdev->priv;
724         struct dvb_frontend_private *fepriv = fe->frontend_priv;
725         int err = -EOPNOTSUPP;
726
727         dprintk ("%s\n", __FUNCTION__);
728
729         if (!fe || fepriv->exit)
730                 return -ENODEV;
731
732         if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
733             (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
734              cmd == FE_DISEQC_RECV_SLAVE_REPLY))
735                 return -EPERM;
736
737         if (down_interruptible (&fepriv->sem))
738                 return -ERESTARTSYS;
739
740         switch (cmd) {
741         case FE_GET_INFO: {
742                 struct dvb_frontend_info* info = parg;
743                 memcpy(info, &fe->ops.info, sizeof(struct dvb_frontend_info));
744
745                 /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't
746                  * do it, it is done for it. */
747                 info->caps |= FE_CAN_INVERSION_AUTO;
748                 err = 0;
749                 break;
750         }
751
752         case FE_READ_STATUS: {
753                 fe_status_t* status = parg;
754
755                 /* if retune was requested but hasn't occured yet, prevent
756                  * that user get signal state from previous tuning */
757                 if(fepriv->state == FESTATE_RETUNE) {
758                         err=0;
759                         *status = 0;
760                         break;
761                 }
762
763                 if (fe->ops.read_status)
764                         err = fe->ops.read_status(fe, status);
765                 break;
766         }
767         case FE_READ_BER:
768                 if (fe->ops.read_ber)
769                         err = fe->ops.read_ber(fe, (__u32*) parg);
770                 break;
771
772         case FE_READ_SIGNAL_STRENGTH:
773                 if (fe->ops.read_signal_strength)
774                         err = fe->ops.read_signal_strength(fe, (__u16*) parg);
775                 break;
776
777         case FE_READ_SNR:
778                 if (fe->ops.read_snr)
779                         err = fe->ops.read_snr(fe, (__u16*) parg);
780                 break;
781
782         case FE_READ_UNCORRECTED_BLOCKS:
783                 if (fe->ops.read_ucblocks)
784                         err = fe->ops.read_ucblocks(fe, (__u32*) parg);
785                 break;
786
787
788         case FE_DISEQC_RESET_OVERLOAD:
789                 if (fe->ops.diseqc_reset_overload) {
790                         err = fe->ops.diseqc_reset_overload(fe);
791                         fepriv->state = FESTATE_DISEQC;
792                         fepriv->status = 0;
793                 }
794                 break;
795
796         case FE_DISEQC_SEND_MASTER_CMD:
797                 if (fe->ops.diseqc_send_master_cmd) {
798                         err = fe->ops.diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg);
799                         fepriv->state = FESTATE_DISEQC;
800                         fepriv->status = 0;
801                 }
802                 break;
803
804         case FE_DISEQC_SEND_BURST:
805                 if (fe->ops.diseqc_send_burst) {
806                         err = fe->ops.diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg);
807                         fepriv->state = FESTATE_DISEQC;
808                         fepriv->status = 0;
809                 }
810                 break;
811
812         case FE_SET_TONE:
813                 if (fe->ops.set_tone) {
814                         err = fe->ops.set_tone(fe, (fe_sec_tone_mode_t) parg);
815                         fepriv->tone = (fe_sec_tone_mode_t) parg;
816                         fepriv->state = FESTATE_DISEQC;
817                         fepriv->status = 0;
818                 }
819                 break;
820
821         case FE_SET_VOLTAGE:
822                 if (fe->ops.set_voltage) {
823                         err = fe->ops.set_voltage(fe, (fe_sec_voltage_t) parg);
824                         fepriv->voltage = (fe_sec_voltage_t) parg;
825                         fepriv->state = FESTATE_DISEQC;
826                         fepriv->status = 0;
827                 }
828                 break;
829
830         case FE_DISHNETWORK_SEND_LEGACY_CMD:
831                 if (fe->ops.dishnetwork_send_legacy_command) {
832                         err = fe->ops.dishnetwork_send_legacy_command(fe, (unsigned long) parg);
833                         fepriv->state = FESTATE_DISEQC;
834                         fepriv->status = 0;
835                 } else if (fe->ops.set_voltage) {
836                         /*
837                          * NOTE: This is a fallback condition.  Some frontends
838                          * (stv0299 for instance) take longer than 8msec to
839                          * respond to a set_voltage command.  Those switches
840                          * need custom routines to switch properly.  For all
841                          * other frontends, the following shoule work ok.
842                          * Dish network legacy switches (as used by Dish500)
843                          * are controlled by sending 9-bit command words
844                          * spaced 8msec apart.
845                          * the actual command word is switch/port dependant
846                          * so it is up to the userspace application to send
847                          * the right command.
848                          * The command must always start with a '0' after
849                          * initialization, so parg is 8 bits and does not
850                          * include the initialization or start bit
851                          */
852                         unsigned long cmd = ((unsigned long) parg) << 1;
853                         struct timeval nexttime;
854                         struct timeval tv[10];
855                         int i;
856                         u8 last = 1;
857                         if (dvb_frontend_debug)
858                                 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
859                         do_gettimeofday(&nexttime);
860                         if (dvb_frontend_debug)
861                                 memcpy(&tv[0], &nexttime, sizeof(struct timeval));
862                         /* before sending a command, initialize by sending
863                          * a 32ms 18V to the switch
864                          */
865                         fe->ops.set_voltage(fe, SEC_VOLTAGE_18);
866                         dvb_frontend_sleep_until(&nexttime, 32000);
867
868                         for (i = 0; i < 9; i++) {
869                                 if (dvb_frontend_debug)
870                                         do_gettimeofday(&tv[i + 1]);
871                                 if ((cmd & 0x01) != last) {
872                                         /* set voltage to (last ? 13V : 18V) */
873                                         fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
874                                         last = (last) ? 0 : 1;
875                                 }
876                                 cmd = cmd >> 1;
877                                 if (i != 8)
878                                         dvb_frontend_sleep_until(&nexttime, 8000);
879                         }
880                         if (dvb_frontend_debug) {
881                                 printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
882                                         __FUNCTION__, fe->dvb->num);
883                                 for (i = 1; i < 10; i++)
884                                         printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
885                         }
886                         err = 0;
887                         fepriv->state = FESTATE_DISEQC;
888                         fepriv->status = 0;
889                 }
890                 break;
891
892         case FE_DISEQC_RECV_SLAVE_REPLY:
893                 if (fe->ops.diseqc_recv_slave_reply)
894                         err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
895                 break;
896
897         case FE_ENABLE_HIGH_LNB_VOLTAGE:
898                 if (fe->ops.enable_high_lnb_voltage)
899                         err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
900                 break;
901
902         case FE_SET_FRONTEND: {
903                 struct dvb_frontend_tune_settings fetunesettings;
904
905                 memcpy (&fepriv->parameters, parg,
906                         sizeof (struct dvb_frontend_parameters));
907
908                 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
909                 memcpy(&fetunesettings.parameters, parg,
910                        sizeof (struct dvb_frontend_parameters));
911
912                 /* force auto frequency inversion if requested */
913                 if (dvb_force_auto_inversion) {
914                         fepriv->parameters.inversion = INVERSION_AUTO;
915                         fetunesettings.parameters.inversion = INVERSION_AUTO;
916                 }
917                 if (fe->ops.info.type == FE_OFDM) {
918                         /* without hierachical coding code_rate_LP is irrelevant,
919                          * so we tolerate the otherwise invalid FEC_NONE setting */
920                         if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE &&
921                             fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE)
922                                 fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO;
923                 }
924
925                 /* get frontend-specific tuning settings */
926                 if (fe->ops.get_tune_settings && (fe->ops.get_tune_settings(fe, &fetunesettings) == 0)) {
927                         fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
928                         fepriv->max_drift = fetunesettings.max_drift;
929                         fepriv->step_size = fetunesettings.step_size;
930                 } else {
931                         /* default values */
932                         switch(fe->ops.info.type) {
933                         case FE_QPSK:
934                                 fepriv->min_delay = HZ/20;
935                                 fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000;
936                                 fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000;
937                                 break;
938
939                         case FE_QAM:
940                                 fepriv->min_delay = HZ/20;
941                                 fepriv->step_size = 0; /* no zigzag */
942                                 fepriv->max_drift = 0;
943                                 break;
944
945                         case FE_OFDM:
946                                 fepriv->min_delay = HZ/20;
947                                 fepriv->step_size = fe->ops.info.frequency_stepsize * 2;
948                                 fepriv->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1;
949                                 break;
950                         case FE_ATSC:
951                                 fepriv->min_delay = HZ/20;
952                                 fepriv->step_size = 0;
953                                 fepriv->max_drift = 0;
954                                 break;
955                         }
956                 }
957                 if (dvb_override_tune_delay > 0)
958                         fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
959
960                 fepriv->state = FESTATE_RETUNE;
961                 dvb_frontend_wakeup(fe);
962                 dvb_frontend_add_event(fe, 0);
963                 fepriv->status = 0;
964                 err = 0;
965                 break;
966         }
967
968         case FE_GET_EVENT:
969                 err = dvb_frontend_get_event (fe, parg, file->f_flags);
970                 break;
971
972         case FE_GET_FRONTEND:
973                 if (fe->ops.get_frontend) {
974                         memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters));
975                         err = fe->ops.get_frontend(fe, (struct dvb_frontend_parameters*) parg);
976                 }
977                 break;
978
979         case FE_SET_FRONTEND_TUNE_MODE:
980                 fepriv->tune_mode_flags = (unsigned long) parg;
981                 err = 0;
982                 break;
983         };
984
985         up (&fepriv->sem);
986         return err;
987 }
988
989 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
990 {
991         struct dvb_device *dvbdev = file->private_data;
992         struct dvb_frontend *fe = dvbdev->priv;
993         struct dvb_frontend_private *fepriv = fe->frontend_priv;
994
995         dprintk ("%s\n", __FUNCTION__);
996
997         poll_wait (file, &fepriv->events.wait_queue, wait);
998
999         if (fepriv->events.eventw != fepriv->events.eventr)
1000                 return (POLLIN | POLLRDNORM | POLLPRI);
1001
1002         return 0;
1003 }
1004
1005 static int dvb_frontend_open(struct inode *inode, struct file *file)
1006 {
1007         struct dvb_device *dvbdev = file->private_data;
1008         struct dvb_frontend *fe = dvbdev->priv;
1009         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1010         int ret;
1011
1012         dprintk ("%s\n", __FUNCTION__);
1013
1014         if ((ret = dvb_generic_open (inode, file)) < 0)
1015                 return ret;
1016
1017         if (fe->ops.ts_bus_ctrl) {
1018                 if ((ret = fe->ops.ts_bus_ctrl (fe, 1)) < 0) {
1019                         dvb_generic_release (inode, file);
1020                         return ret;
1021                 }
1022         }
1023
1024         if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
1025
1026                 /* normal tune mode when opened R/W */
1027                 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
1028                 fepriv->tone = -1;
1029                 fepriv->voltage = -1;
1030
1031                 ret = dvb_frontend_start (fe);
1032                 if (ret)
1033                         dvb_generic_release (inode, file);
1034
1035                 /*  empty event queue */
1036                 fepriv->events.eventr = fepriv->events.eventw = 0;
1037         }
1038
1039         return ret;
1040 }
1041
1042 static int dvb_frontend_release(struct inode *inode, struct file *file)
1043 {
1044         struct dvb_device *dvbdev = file->private_data;
1045         struct dvb_frontend *fe = dvbdev->priv;
1046         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1047
1048         dprintk ("%s\n", __FUNCTION__);
1049
1050         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
1051                 fepriv->release_jiffies = jiffies;
1052
1053         if (fe->ops.ts_bus_ctrl)
1054                 fe->ops.ts_bus_ctrl (fe, 0);
1055
1056         return dvb_generic_release (inode, file);
1057 }
1058
1059 static struct file_operations dvb_frontend_fops = {
1060         .owner          = THIS_MODULE,
1061         .ioctl          = dvb_generic_ioctl,
1062         .poll           = dvb_frontend_poll,
1063         .open           = dvb_frontend_open,
1064         .release        = dvb_frontend_release
1065 };
1066
1067 int dvb_register_frontend(struct dvb_adapter* dvb,
1068                           struct dvb_frontend* fe)
1069 {
1070         struct dvb_frontend_private *fepriv;
1071         static const struct dvb_device dvbdev_template = {
1072                 .users = ~0,
1073                 .writers = 1,
1074                 .readers = (~0)-1,
1075                 .fops = &dvb_frontend_fops,
1076                 .kernel_ioctl = dvb_frontend_ioctl
1077         };
1078
1079         dprintk ("%s\n", __FUNCTION__);
1080
1081         if (mutex_lock_interruptible(&frontend_mutex))
1082                 return -ERESTARTSYS;
1083
1084         fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1085         if (fe->frontend_priv == NULL) {
1086                 mutex_unlock(&frontend_mutex);
1087                 return -ENOMEM;
1088         }
1089         fepriv = fe->frontend_priv;
1090
1091         init_MUTEX (&fepriv->sem);
1092         init_waitqueue_head (&fepriv->wait_queue);
1093         init_waitqueue_head (&fepriv->events.wait_queue);
1094         init_MUTEX (&fepriv->events.sem);
1095         fe->dvb = dvb;
1096         fepriv->inversion = INVERSION_OFF;
1097
1098         printk ("DVB: registering frontend %i (%s)...\n",
1099                 fe->dvb->num,
1100                 fe->ops.info.name);
1101
1102         dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1103                              fe, DVB_DEVICE_FRONTEND);
1104
1105         mutex_unlock(&frontend_mutex);
1106         return 0;
1107 }
1108 EXPORT_SYMBOL(dvb_register_frontend);
1109
1110 int dvb_unregister_frontend(struct dvb_frontend* fe)
1111 {
1112         struct dvb_frontend_private *fepriv = fe->frontend_priv;
1113         dprintk ("%s\n", __FUNCTION__);
1114
1115         mutex_lock(&frontend_mutex);
1116         dvb_unregister_device (fepriv->dvbdev);
1117         dvb_frontend_stop (fe);
1118
1119         /* fe is invalid now */
1120         kfree(fepriv);
1121         mutex_unlock(&frontend_mutex);
1122         return 0;
1123 }
1124 EXPORT_SYMBOL(dvb_unregister_frontend);
1125
1126 #ifdef CONFIG_DVB_CORE_ATTACH
1127 void dvb_frontend_detach(struct dvb_frontend* fe)
1128 {
1129         void *ptr;
1130
1131         if (fe->ops.release_sec) {
1132                 fe->ops.release_sec(fe);
1133                 symbol_put_addr(fe->ops.release_sec);
1134         }
1135         if (fe->ops.tuner_ops.release) {
1136                 fe->ops.tuner_ops.release(fe);
1137                 symbol_put_addr(fe->ops.tuner_ops.release);
1138         }
1139         ptr = (void*)fe->ops.release;
1140         if (ptr) {
1141                 fe->ops.release(fe);
1142                 symbol_put_addr(ptr);
1143         }
1144 }
1145 #else
1146 void dvb_frontend_detach(struct dvb_frontend* fe)
1147 {
1148         if (fe->ops.release_sec)
1149                 fe->ops.release_sec(fe);
1150         if (fe->ops.tuner_ops.release)
1151                 fe->ops.tuner_ops.release(fe);
1152         if (fe->ops.release)
1153                 fe->ops.release(fe);
1154 }
1155 #endif
1156 EXPORT_SYMBOL(dvb_frontend_detach);