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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> | |
37 | #include <linux/suspend.h> | |
cc89c229 | 38 | #include <linux/jiffies.h> |
1da177e4 LT |
39 | #include <asm/processor.h> |
40 | #include <asm/semaphore.h> | |
41 | ||
42 | #include "dvb_frontend.h" | |
43 | #include "dvbdev.h" | |
44 | ||
45 | static int dvb_frontend_debug; | |
46 | static int dvb_shutdown_timeout = 5; | |
47 | static int dvb_force_auto_inversion; | |
48 | static int dvb_override_tune_delay; | |
49 | static int dvb_powerdown_on_sleep = 1; | |
50 | ||
51 | module_param_named(frontend_debug, dvb_frontend_debug, int, 0644); | |
f4f009a7 | 52 | MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off)."); |
1da177e4 LT |
53 | module_param(dvb_shutdown_timeout, int, 0444); |
54 | MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); | |
55 | module_param(dvb_force_auto_inversion, int, 0444); | |
56 | MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); | |
57 | module_param(dvb_override_tune_delay, int, 0444); | |
58 | MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt"); | |
59 | module_param(dvb_powerdown_on_sleep, int, 0444); | |
60 | MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)"); | |
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) | |
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 DECLARE_MUTEX(frontend_mutex); | |
92 | ||
93 | struct dvb_frontend_private { | |
94 | ||
36cb557a | 95 | /* thread/frontend values */ |
1da177e4 LT |
96 | struct dvb_device *dvbdev; |
97 | struct dvb_frontend_parameters parameters; | |
98 | struct dvb_fe_events events; | |
99 | struct semaphore sem; | |
100 | struct list_head list_head; | |
101 | wait_queue_head_t wait_queue; | |
102 | pid_t thread_pid; | |
103 | unsigned long release_jiffies; | |
36cb557a AQ |
104 | unsigned int exit; |
105 | unsigned int wakeup; | |
1da177e4 | 106 | fe_status_t status; |
36cb557a AQ |
107 | unsigned int tune_mode_flags; |
108 | unsigned int delay; | |
109 | ||
110 | /* swzigzag values */ | |
111 | unsigned int state; | |
112 | unsigned int bending; | |
113 | int lnb_drift; | |
114 | unsigned int inversion; | |
115 | unsigned int auto_step; | |
116 | unsigned int auto_sub_step; | |
117 | unsigned int started_auto_step; | |
118 | unsigned int min_delay; | |
119 | unsigned int max_drift; | |
120 | unsigned int step_size; | |
121 | int quality; | |
122 | unsigned int check_wrapped; | |
1da177e4 LT |
123 | }; |
124 | ||
125 | ||
126 | static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) | |
127 | { | |
0c53c70f | 128 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
129 | struct dvb_fe_events *events = &fepriv->events; |
130 | struct dvb_frontend_event *e; | |
131 | int wp; | |
132 | ||
133 | dprintk ("%s\n", __FUNCTION__); | |
134 | ||
135 | if (down_interruptible (&events->sem)) | |
136 | return; | |
137 | ||
138 | wp = (events->eventw + 1) % MAX_EVENT; | |
139 | ||
140 | if (wp == events->eventr) { | |
141 | events->overflow = 1; | |
142 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
143 | } | |
144 | ||
145 | e = &events->events[events->eventw]; | |
146 | ||
147 | memcpy (&e->parameters, &fepriv->parameters, | |
148 | sizeof (struct dvb_frontend_parameters)); | |
149 | ||
150 | if (status & FE_HAS_LOCK) | |
151 | if (fe->ops->get_frontend) | |
152 | fe->ops->get_frontend(fe, &e->parameters); | |
153 | ||
154 | events->eventw = wp; | |
155 | ||
156 | up (&events->sem); | |
157 | ||
158 | e->status = status; | |
159 | ||
160 | wake_up_interruptible (&events->wait_queue); | |
161 | } | |
162 | ||
163 | static int dvb_frontend_get_event(struct dvb_frontend *fe, | |
164 | struct dvb_frontend_event *event, int flags) | |
165 | { | |
0c53c70f | 166 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
167 | struct dvb_fe_events *events = &fepriv->events; |
168 | ||
169 | dprintk ("%s\n", __FUNCTION__); | |
170 | ||
171 | if (events->overflow) { | |
172 | events->overflow = 0; | |
173 | return -EOVERFLOW; | |
174 | } | |
175 | ||
176 | if (events->eventw == events->eventr) { | |
177 | int ret; | |
178 | ||
179 | if (flags & O_NONBLOCK) | |
180 | return -EWOULDBLOCK; | |
181 | ||
182 | up(&fepriv->sem); | |
183 | ||
184 | ret = wait_event_interruptible (events->wait_queue, | |
185 | events->eventw != events->eventr); | |
186 | ||
187 | if (down_interruptible (&fepriv->sem)) | |
188 | return -ERESTARTSYS; | |
189 | ||
190 | if (ret < 0) | |
191 | return ret; | |
192 | } | |
193 | ||
194 | if (down_interruptible (&events->sem)) | |
195 | return -ERESTARTSYS; | |
196 | ||
197 | memcpy (event, &events->events[events->eventr], | |
198 | sizeof(struct dvb_frontend_event)); | |
199 | ||
200 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
201 | ||
202 | up (&events->sem); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static void dvb_frontend_init(struct dvb_frontend *fe) | |
208 | { | |
209 | dprintk ("DVB: initialising frontend %i (%s)...\n", | |
210 | fe->dvb->num, | |
211 | fe->ops->info.name); | |
212 | ||
213 | if (fe->ops->init) | |
214 | fe->ops->init(fe); | |
215 | } | |
216 | ||
36cb557a | 217 | static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked) |
1da177e4 | 218 | { |
36cb557a | 219 | int q2; |
1da177e4 | 220 | |
36cb557a | 221 | dprintk ("%s\n", __FUNCTION__); |
1da177e4 | 222 | |
36cb557a AQ |
223 | if (locked) |
224 | (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256; | |
225 | else | |
226 | (fepriv->quality) = (fepriv->quality * 220 + 0) / 256; | |
1da177e4 | 227 | |
36cb557a AQ |
228 | q2 = fepriv->quality - 128; |
229 | q2 *= q2; | |
1da177e4 | 230 | |
36cb557a | 231 | fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128); |
1da177e4 LT |
232 | } |
233 | ||
234 | /** | |
235 | * Performs automatic twiddling of frontend parameters. | |
236 | * | |
237 | * @param fe The frontend concerned. | |
238 | * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT | |
239 | * @returns Number of complete iterations that have been performed. | |
240 | */ | |
36cb557a | 241 | static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped) |
1da177e4 LT |
242 | { |
243 | int autoinversion; | |
244 | int ready = 0; | |
0c53c70f | 245 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
246 | int original_inversion = fepriv->parameters.inversion; |
247 | u32 original_frequency = fepriv->parameters.frequency; | |
248 | ||
249 | /* are we using autoinversion? */ | |
250 | autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
251 | (fepriv->parameters.inversion == INVERSION_AUTO)); | |
252 | ||
253 | /* setup parameters correctly */ | |
254 | while(!ready) { | |
255 | /* calculate the lnb_drift */ | |
256 | fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; | |
257 | ||
258 | /* wrap the auto_step if we've exceeded the maximum drift */ | |
259 | if (fepriv->lnb_drift > fepriv->max_drift) { | |
260 | fepriv->auto_step = 0; | |
261 | fepriv->auto_sub_step = 0; | |
262 | fepriv->lnb_drift = 0; | |
263 | } | |
264 | ||
265 | /* perform inversion and +/- zigzag */ | |
266 | switch(fepriv->auto_sub_step) { | |
267 | case 0: | |
268 | /* try with the current inversion and current drift setting */ | |
269 | ready = 1; | |
270 | break; | |
271 | ||
272 | case 1: | |
273 | if (!autoinversion) break; | |
274 | ||
275 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
276 | ready = 1; | |
277 | break; | |
278 | ||
279 | case 2: | |
280 | if (fepriv->lnb_drift == 0) break; | |
281 | ||
282 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
283 | ready = 1; | |
284 | break; | |
285 | ||
286 | case 3: | |
287 | if (fepriv->lnb_drift == 0) break; | |
288 | if (!autoinversion) break; | |
289 | ||
290 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
291 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
292 | ready = 1; | |
293 | break; | |
294 | ||
295 | default: | |
296 | fepriv->auto_step++; | |
297 | fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ | |
298 | break; | |
299 | } | |
300 | ||
301 | if (!ready) fepriv->auto_sub_step++; | |
302 | } | |
303 | ||
304 | /* if this attempt would hit where we started, indicate a complete | |
305 | * iteration has occurred */ | |
306 | if ((fepriv->auto_step == fepriv->started_auto_step) && | |
307 | (fepriv->auto_sub_step == 0) && check_wrapped) { | |
308 | return 1; | |
309 | } | |
310 | ||
311 | dprintk("%s: drift:%i inversion:%i auto_step:%i " | |
312 | "auto_sub_step:%i started_auto_step:%i\n", | |
313 | __FUNCTION__, fepriv->lnb_drift, fepriv->inversion, | |
314 | fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step); | |
315 | ||
316 | /* set the frontend itself */ | |
317 | fepriv->parameters.frequency += fepriv->lnb_drift; | |
318 | if (autoinversion) | |
319 | fepriv->parameters.inversion = fepriv->inversion; | |
320 | if (fe->ops->set_frontend) | |
321 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
322 | ||
323 | fepriv->parameters.frequency = original_frequency; | |
324 | fepriv->parameters.inversion = original_inversion; | |
325 | ||
326 | fepriv->auto_sub_step++; | |
327 | return 0; | |
328 | } | |
329 | ||
36cb557a AQ |
330 | static void dvb_frontend_swzigzag(struct dvb_frontend *fe) |
331 | { | |
332 | fe_status_t s; | |
333 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
334 | ||
335 | /* if we've got no parameters, just keep idling */ | |
336 | if (fepriv->state & FESTATE_IDLE) { | |
337 | fepriv->delay = 3*HZ; | |
338 | fepriv->quality = 0; | |
339 | return; | |
340 | } | |
341 | ||
342 | /* in SCAN mode, we just set the frontend when asked and leave it alone */ | |
343 | if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) { | |
344 | if (fepriv->state & FESTATE_RETUNE) { | |
345 | if (fe->ops->set_frontend) | |
346 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
347 | fepriv->state = FESTATE_TUNED; | |
348 | } | |
349 | fepriv->delay = 3*HZ; | |
350 | fepriv->quality = 0; | |
351 | return; | |
352 | } | |
353 | ||
354 | /* get the frontend status */ | |
355 | if (fepriv->state & FESTATE_RETUNE) { | |
356 | s = 0; | |
357 | } else { | |
358 | if (fe->ops->read_status) | |
359 | fe->ops->read_status(fe, &s); | |
360 | if (s != fepriv->status) { | |
361 | dvb_frontend_add_event(fe, s); | |
362 | fepriv->status = s; | |
363 | } | |
364 | } | |
365 | ||
366 | /* if we're not tuned, and we have a lock, move to the TUNED state */ | |
367 | if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { | |
368 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
369 | fepriv->state = FESTATE_TUNED; | |
370 | ||
371 | /* if we're tuned, then we have determined the correct inversion */ | |
372 | if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
373 | (fepriv->parameters.inversion == INVERSION_AUTO)) { | |
374 | fepriv->parameters.inversion = fepriv->inversion; | |
375 | } | |
376 | return; | |
377 | } | |
378 | ||
379 | /* if we are tuned already, check we're still locked */ | |
380 | if (fepriv->state & FESTATE_TUNED) { | |
381 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
382 | ||
383 | /* we're tuned, and the lock is still good... */ | |
384 | if (s & FE_HAS_LOCK) { | |
385 | return; | |
386 | } else { /* if we _WERE_ tuned, but now don't have a lock */ | |
387 | fepriv->state = FESTATE_ZIGZAG_FAST; | |
388 | fepriv->started_auto_step = fepriv->auto_step; | |
389 | fepriv->check_wrapped = 0; | |
390 | } | |
391 | } | |
392 | ||
393 | /* don't actually do anything if we're in the LOSTLOCK state, | |
394 | * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ | |
395 | if ((fepriv->state & FESTATE_LOSTLOCK) && | |
396 | (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { | |
397 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
398 | return; | |
399 | } | |
400 | ||
401 | /* don't do anything if we're in the DISEQC state, since this | |
402 | * might be someone with a motorized dish controlled by DISEQC. | |
403 | * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ | |
404 | if (fepriv->state & FESTATE_DISEQC) { | |
405 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
406 | return; | |
407 | } | |
408 | ||
409 | /* if we're in the RETUNE state, set everything up for a brand | |
410 | * new scan, keeping the current inversion setting, as the next | |
411 | * tune is _very_ likely to require the same */ | |
412 | if (fepriv->state & FESTATE_RETUNE) { | |
413 | fepriv->lnb_drift = 0; | |
414 | fepriv->auto_step = 0; | |
415 | fepriv->auto_sub_step = 0; | |
416 | fepriv->started_auto_step = 0; | |
417 | fepriv->check_wrapped = 0; | |
418 | } | |
419 | ||
420 | /* fast zigzag. */ | |
421 | if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { | |
422 | fepriv->delay = fepriv->min_delay; | |
423 | ||
424 | /* peform a tune */ | |
425 | if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) { | |
426 | /* OK, if we've run out of trials at the fast speed. | |
427 | * Drop back to slow for the _next_ attempt */ | |
428 | fepriv->state = FESTATE_SEARCHING_SLOW; | |
429 | fepriv->started_auto_step = fepriv->auto_step; | |
430 | return; | |
431 | } | |
432 | fepriv->check_wrapped = 1; | |
433 | ||
434 | /* if we've just retuned, enter the ZIGZAG_FAST state. | |
435 | * This ensures we cannot return from an | |
436 | * FE_SET_FRONTEND ioctl before the first frontend tune | |
437 | * occurs */ | |
438 | if (fepriv->state & FESTATE_RETUNE) { | |
439 | fepriv->state = FESTATE_TUNING_FAST; | |
440 | } | |
441 | } | |
442 | ||
443 | /* slow zigzag */ | |
444 | if (fepriv->state & FESTATE_SEARCHING_SLOW) { | |
445 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
446 | ||
447 | /* Note: don't bother checking for wrapping; we stay in this | |
448 | * state until we get a lock */ | |
449 | dvb_frontend_swzigzag_autotune(fe, 0); | |
450 | } | |
451 | } | |
452 | ||
1da177e4 LT |
453 | static int dvb_frontend_is_exiting(struct dvb_frontend *fe) |
454 | { | |
0c53c70f | 455 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
456 | |
457 | if (fepriv->exit) | |
458 | return 1; | |
459 | ||
460 | if (fepriv->dvbdev->writers == 1) | |
cc89c229 | 461 | if (time_after(jiffies, fepriv->release_jiffies + |
36cb557a | 462 | dvb_shutdown_timeout * HZ)) |
1da177e4 LT |
463 | return 1; |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) | |
469 | { | |
0c53c70f | 470 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
471 | |
472 | if (fepriv->wakeup) { | |
473 | fepriv->wakeup = 0; | |
474 | return 1; | |
475 | } | |
476 | return dvb_frontend_is_exiting(fe); | |
477 | } | |
478 | ||
479 | static void dvb_frontend_wakeup(struct dvb_frontend *fe) | |
480 | { | |
0c53c70f | 481 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
482 | |
483 | fepriv->wakeup = 1; | |
484 | wake_up_interruptible(&fepriv->wait_queue); | |
485 | } | |
486 | ||
1da177e4 LT |
487 | static int dvb_frontend_thread(void *data) |
488 | { | |
0c53c70f JS |
489 | struct dvb_frontend *fe = data; |
490 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
1da177e4 LT |
491 | unsigned long timeout; |
492 | char name [15]; | |
1da177e4 | 493 | fe_status_t s; |
36cb557a | 494 | struct dvb_frontend_parameters *params; |
1da177e4 LT |
495 | |
496 | dprintk("%s\n", __FUNCTION__); | |
497 | ||
498 | snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num); | |
499 | ||
afd1a0c9 MCC |
500 | lock_kernel(); |
501 | daemonize(name); | |
502 | sigfillset(¤t->blocked); | |
503 | unlock_kernel(); | |
1da177e4 | 504 | |
36cb557a AQ |
505 | fepriv->check_wrapped = 0; |
506 | fepriv->quality = 0; | |
507 | fepriv->delay = 3*HZ; | |
1da177e4 LT |
508 | fepriv->status = 0; |
509 | dvb_frontend_init(fe); | |
510 | fepriv->wakeup = 0; | |
511 | ||
512 | while (1) { | |
513 | up(&fepriv->sem); /* is locked when we enter the thread... */ | |
514 | ||
515 | timeout = wait_event_interruptible_timeout(fepriv->wait_queue, | |
516 | dvb_frontend_should_wakeup(fe), | |
36cb557a | 517 | fepriv->delay); |
1da177e4 LT |
518 | if (0 != dvb_frontend_is_exiting(fe)) { |
519 | /* got signal or quitting */ | |
520 | break; | |
521 | } | |
522 | ||
3e1d1d28 | 523 | try_to_freeze(); |
1da177e4 LT |
524 | |
525 | if (down_interruptible(&fepriv->sem)) | |
526 | break; | |
527 | ||
36cb557a AQ |
528 | /* do an iteration of the tuning loop */ |
529 | if (fe->ops->tune) { | |
530 | /* have we been asked to retune? */ | |
531 | params = NULL; | |
532 | if (fepriv->state & FESTATE_RETUNE) { | |
533 | params = &fepriv->parameters; | |
534 | fepriv->state = FESTATE_TUNED; | |
535 | } | |
1da177e4 | 536 | |
36cb557a | 537 | fe->ops->tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s); |
1da177e4 LT |
538 | if (s != fepriv->status) { |
539 | dvb_frontend_add_event(fe, s); | |
540 | fepriv->status = s; | |
541 | } | |
36cb557a AQ |
542 | } else { |
543 | dvb_frontend_swzigzag(fe); | |
1da177e4 LT |
544 | } |
545 | } | |
546 | ||
547 | if (dvb_shutdown_timeout) { | |
548 | if (dvb_powerdown_on_sleep) | |
549 | if (fe->ops->set_voltage) | |
550 | fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF); | |
551 | if (fe->ops->sleep) | |
552 | fe->ops->sleep(fe); | |
553 | } | |
554 | ||
555 | fepriv->thread_pid = 0; | |
556 | mb(); | |
557 | ||
558 | dvb_frontend_wakeup(fe); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static void dvb_frontend_stop(struct dvb_frontend *fe) | |
563 | { | |
564 | unsigned long ret; | |
0c53c70f | 565 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
566 | |
567 | dprintk ("%s\n", __FUNCTION__); | |
568 | ||
569 | fepriv->exit = 1; | |
570 | mb(); | |
571 | ||
572 | if (!fepriv->thread_pid) | |
573 | return; | |
574 | ||
575 | /* check if the thread is really alive */ | |
576 | if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) { | |
577 | printk("dvb_frontend_stop: thread PID %d already died\n", | |
578 | fepriv->thread_pid); | |
579 | /* make sure the mutex was not held by the thread */ | |
580 | init_MUTEX (&fepriv->sem); | |
581 | return; | |
582 | } | |
583 | ||
584 | /* wake up the frontend thread, so it notices that fe->exit == 1 */ | |
585 | dvb_frontend_wakeup(fe); | |
586 | ||
587 | /* wait until the frontend thread has exited */ | |
588 | ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid); | |
589 | if (-ERESTARTSYS != ret) { | |
590 | fepriv->state = FESTATE_IDLE; | |
591 | return; | |
592 | } | |
593 | fepriv->state = FESTATE_IDLE; | |
594 | ||
595 | /* paranoia check in case a signal arrived */ | |
596 | if (fepriv->thread_pid) | |
597 | printk("dvb_frontend_stop: warning: thread PID %d won't exit\n", | |
598 | fepriv->thread_pid); | |
599 | } | |
600 | ||
83b75b04 N |
601 | s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) |
602 | { | |
603 | return ((curtime.tv_usec < lasttime.tv_usec) ? | |
604 | 1000000 - lasttime.tv_usec + curtime.tv_usec : | |
605 | curtime.tv_usec - lasttime.tv_usec); | |
606 | } | |
607 | EXPORT_SYMBOL(timeval_usec_diff); | |
608 | ||
609 | static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) | |
610 | { | |
611 | curtime->tv_usec += add_usec; | |
612 | if (curtime->tv_usec >= 1000000) { | |
613 | curtime->tv_usec -= 1000000; | |
614 | curtime->tv_sec++; | |
615 | } | |
616 | } | |
617 | ||
618 | /* | |
619 | * Sleep until gettimeofday() > waketime + add_usec | |
620 | * This needs to be as precise as possible, but as the delay is | |
621 | * usually between 2ms and 32ms, it is done using a scheduled msleep | |
622 | * followed by usleep (normally a busy-wait loop) for the remainder | |
623 | */ | |
624 | void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) | |
625 | { | |
626 | struct timeval lasttime; | |
627 | s32 delta, newdelta; | |
628 | ||
629 | timeval_usec_add(waketime, add_usec); | |
630 | ||
631 | do_gettimeofday(&lasttime); | |
632 | delta = timeval_usec_diff(lasttime, *waketime); | |
633 | if (delta > 2500) { | |
634 | msleep((delta - 1500) / 1000); | |
635 | do_gettimeofday(&lasttime); | |
636 | newdelta = timeval_usec_diff(lasttime, *waketime); | |
637 | delta = (newdelta > delta) ? 0 : newdelta; | |
638 | } | |
639 | if (delta > 0) | |
640 | udelay(delta); | |
641 | } | |
642 | EXPORT_SYMBOL(dvb_frontend_sleep_until); | |
643 | ||
1da177e4 LT |
644 | static int dvb_frontend_start(struct dvb_frontend *fe) |
645 | { | |
646 | int ret; | |
0c53c70f | 647 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
648 | |
649 | dprintk ("%s\n", __FUNCTION__); | |
650 | ||
651 | if (fepriv->thread_pid) { | |
652 | if (!fepriv->exit) | |
653 | return 0; | |
654 | else | |
655 | dvb_frontend_stop (fe); | |
656 | } | |
657 | ||
658 | if (signal_pending(current)) | |
659 | return -EINTR; | |
660 | if (down_interruptible (&fepriv->sem)) | |
661 | return -EINTR; | |
662 | ||
663 | fepriv->state = FESTATE_IDLE; | |
664 | fepriv->exit = 0; | |
665 | fepriv->thread_pid = 0; | |
666 | mb(); | |
667 | ||
668 | ret = kernel_thread (dvb_frontend_thread, fe, 0); | |
669 | ||
670 | if (ret < 0) { | |
671 | printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret); | |
672 | up(&fepriv->sem); | |
673 | return ret; | |
674 | } | |
675 | fepriv->thread_pid = ret; | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | static int dvb_frontend_ioctl(struct inode *inode, struct file *file, | |
681 | unsigned int cmd, void *parg) | |
682 | { | |
683 | struct dvb_device *dvbdev = file->private_data; | |
684 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 685 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
686 | int err = -EOPNOTSUPP; |
687 | ||
688 | dprintk ("%s\n", __FUNCTION__); | |
689 | ||
690 | if (!fe || fepriv->exit) | |
691 | return -ENODEV; | |
692 | ||
693 | if ((file->f_flags & O_ACCMODE) == O_RDONLY && | |
694 | (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT || | |
695 | cmd == FE_DISEQC_RECV_SLAVE_REPLY)) | |
696 | return -EPERM; | |
697 | ||
698 | if (down_interruptible (&fepriv->sem)) | |
699 | return -ERESTARTSYS; | |
700 | ||
701 | switch (cmd) { | |
702 | case FE_GET_INFO: { | |
0c53c70f | 703 | struct dvb_frontend_info* info = parg; |
1da177e4 LT |
704 | memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info)); |
705 | ||
706 | /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't | |
707 | * do it, it is done for it. */ | |
708 | info->caps |= FE_CAN_INVERSION_AUTO; | |
709 | err = 0; | |
710 | break; | |
711 | } | |
712 | ||
6757ccc5 PB |
713 | case FE_READ_STATUS: { |
714 | fe_status_t* status = parg; | |
715 | ||
716 | /* if retune was requested but hasn't occured yet, prevent | |
717 | * that user get signal state from previous tuning */ | |
718 | if(fepriv->state == FESTATE_RETUNE) { | |
719 | err=0; | |
720 | *status = 0; | |
721 | break; | |
722 | } | |
723 | ||
1da177e4 | 724 | if (fe->ops->read_status) |
6757ccc5 | 725 | err = fe->ops->read_status(fe, status); |
1da177e4 | 726 | break; |
6757ccc5 | 727 | } |
1da177e4 LT |
728 | case FE_READ_BER: |
729 | if (fe->ops->read_ber) | |
730 | err = fe->ops->read_ber(fe, (__u32*) parg); | |
731 | break; | |
732 | ||
733 | case FE_READ_SIGNAL_STRENGTH: | |
734 | if (fe->ops->read_signal_strength) | |
735 | err = fe->ops->read_signal_strength(fe, (__u16*) parg); | |
736 | break; | |
737 | ||
738 | case FE_READ_SNR: | |
739 | if (fe->ops->read_snr) | |
740 | err = fe->ops->read_snr(fe, (__u16*) parg); | |
741 | break; | |
742 | ||
743 | case FE_READ_UNCORRECTED_BLOCKS: | |
744 | if (fe->ops->read_ucblocks) | |
745 | err = fe->ops->read_ucblocks(fe, (__u32*) parg); | |
746 | break; | |
747 | ||
748 | ||
749 | case FE_DISEQC_RESET_OVERLOAD: | |
750 | if (fe->ops->diseqc_reset_overload) { | |
751 | err = fe->ops->diseqc_reset_overload(fe); | |
752 | fepriv->state = FESTATE_DISEQC; | |
753 | fepriv->status = 0; | |
754 | } | |
755 | break; | |
756 | ||
757 | case FE_DISEQC_SEND_MASTER_CMD: | |
758 | if (fe->ops->diseqc_send_master_cmd) { | |
759 | err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg); | |
760 | fepriv->state = FESTATE_DISEQC; | |
761 | fepriv->status = 0; | |
762 | } | |
763 | break; | |
764 | ||
765 | case FE_DISEQC_SEND_BURST: | |
766 | if (fe->ops->diseqc_send_burst) { | |
767 | err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg); | |
768 | fepriv->state = FESTATE_DISEQC; | |
769 | fepriv->status = 0; | |
770 | } | |
771 | break; | |
772 | ||
773 | case FE_SET_TONE: | |
774 | if (fe->ops->set_tone) { | |
775 | err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg); | |
776 | fepriv->state = FESTATE_DISEQC; | |
777 | fepriv->status = 0; | |
778 | } | |
779 | break; | |
780 | ||
781 | case FE_SET_VOLTAGE: | |
782 | if (fe->ops->set_voltage) { | |
783 | err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg); | |
784 | fepriv->state = FESTATE_DISEQC; | |
785 | fepriv->status = 0; | |
786 | } | |
787 | break; | |
788 | ||
789 | case FE_DISHNETWORK_SEND_LEGACY_CMD: | |
790 | if (fe->ops->dishnetwork_send_legacy_command) { | |
791 | err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg); | |
792 | fepriv->state = FESTATE_DISEQC; | |
793 | fepriv->status = 0; | |
83b75b04 N |
794 | } else if (fe->ops->set_voltage) { |
795 | /* | |
796 | * NOTE: This is a fallback condition. Some frontends | |
797 | * (stv0299 for instance) take longer than 8msec to | |
798 | * respond to a set_voltage command. Those switches | |
799 | * need custom routines to switch properly. For all | |
800 | * other frontends, the following shoule work ok. | |
801 | * Dish network legacy switches (as used by Dish500) | |
802 | * are controlled by sending 9-bit command words | |
803 | * spaced 8msec apart. | |
804 | * the actual command word is switch/port dependant | |
805 | * so it is up to the userspace application to send | |
806 | * the right command. | |
807 | * The command must always start with a '0' after | |
808 | * initialization, so parg is 8 bits and does not | |
809 | * include the initialization or start bit | |
810 | */ | |
811 | unsigned int cmd = ((unsigned int) parg) << 1; | |
812 | struct timeval nexttime; | |
813 | struct timeval tv[10]; | |
814 | int i; | |
815 | u8 last = 1; | |
816 | if (dvb_frontend_debug) | |
817 | printk("%s switch command: 0x%04x\n", __FUNCTION__, cmd); | |
818 | do_gettimeofday(&nexttime); | |
819 | if (dvb_frontend_debug) | |
820 | memcpy(&tv[0], &nexttime, sizeof(struct timeval)); | |
821 | /* before sending a command, initialize by sending | |
822 | * a 32ms 18V to the switch | |
823 | */ | |
824 | fe->ops->set_voltage(fe, SEC_VOLTAGE_18); | |
825 | dvb_frontend_sleep_until(&nexttime, 32000); | |
826 | ||
827 | for (i = 0; i < 9; i++) { | |
828 | if (dvb_frontend_debug) | |
829 | do_gettimeofday(&tv[i + 1]); | |
830 | if ((cmd & 0x01) != last) { | |
831 | /* set voltage to (last ? 13V : 18V) */ | |
832 | fe->ops->set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); | |
833 | last = (last) ? 0 : 1; | |
834 | } | |
835 | cmd = cmd >> 1; | |
836 | if (i != 8) | |
837 | dvb_frontend_sleep_until(&nexttime, 8000); | |
838 | } | |
839 | if (dvb_frontend_debug) { | |
840 | printk("%s(%d): switch delay (should be 32k followed by all 8k\n", | |
841 | __FUNCTION__, fe->dvb->num); | |
842 | for (i = 1; i < 10; i++) | |
843 | printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); | |
844 | } | |
845 | err = 0; | |
846 | fepriv->state = FESTATE_DISEQC; | |
847 | fepriv->status = 0; | |
1da177e4 LT |
848 | } |
849 | break; | |
850 | ||
851 | case FE_DISEQC_RECV_SLAVE_REPLY: | |
852 | if (fe->ops->diseqc_recv_slave_reply) | |
853 | err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg); | |
854 | break; | |
855 | ||
856 | case FE_ENABLE_HIGH_LNB_VOLTAGE: | |
857 | if (fe->ops->enable_high_lnb_voltage) | |
858 | err = fe->ops->enable_high_lnb_voltage(fe, (int) parg); | |
859 | break; | |
860 | ||
861 | case FE_SET_FRONTEND: { | |
862 | struct dvb_frontend_tune_settings fetunesettings; | |
863 | ||
864 | memcpy (&fepriv->parameters, parg, | |
865 | sizeof (struct dvb_frontend_parameters)); | |
866 | ||
867 | memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings)); | |
868 | memcpy(&fetunesettings.parameters, parg, | |
869 | sizeof (struct dvb_frontend_parameters)); | |
870 | ||
871 | /* force auto frequency inversion if requested */ | |
872 | if (dvb_force_auto_inversion) { | |
873 | fepriv->parameters.inversion = INVERSION_AUTO; | |
874 | fetunesettings.parameters.inversion = INVERSION_AUTO; | |
875 | } | |
876 | if (fe->ops->info.type == FE_OFDM) { | |
877 | /* without hierachical coding code_rate_LP is irrelevant, | |
878 | * so we tolerate the otherwise invalid FEC_NONE setting */ | |
879 | if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE && | |
880 | fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE) | |
881 | fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO; | |
882 | } | |
883 | ||
884 | /* get frontend-specific tuning settings */ | |
885 | if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) { | |
886 | fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; | |
887 | fepriv->max_drift = fetunesettings.max_drift; | |
888 | fepriv->step_size = fetunesettings.step_size; | |
889 | } else { | |
890 | /* default values */ | |
891 | switch(fe->ops->info.type) { | |
892 | case FE_QPSK: | |
893 | fepriv->min_delay = HZ/20; | |
894 | fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000; | |
895 | fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000; | |
896 | break; | |
897 | ||
898 | case FE_QAM: | |
899 | fepriv->min_delay = HZ/20; | |
900 | fepriv->step_size = 0; /* no zigzag */ | |
901 | fepriv->max_drift = 0; | |
902 | break; | |
903 | ||
904 | case FE_OFDM: | |
905 | fepriv->min_delay = HZ/20; | |
906 | fepriv->step_size = fe->ops->info.frequency_stepsize * 2; | |
907 | fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1; | |
908 | break; | |
909 | case FE_ATSC: | |
910 | printk("dvb-core: FE_ATSC not handled yet.\n"); | |
911 | break; | |
912 | } | |
913 | } | |
914 | if (dvb_override_tune_delay > 0) | |
915 | fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; | |
916 | ||
917 | fepriv->state = FESTATE_RETUNE; | |
918 | dvb_frontend_wakeup(fe); | |
919 | dvb_frontend_add_event(fe, 0); | |
920 | fepriv->status = 0; | |
921 | err = 0; | |
922 | break; | |
923 | } | |
924 | ||
925 | case FE_GET_EVENT: | |
926 | err = dvb_frontend_get_event (fe, parg, file->f_flags); | |
927 | break; | |
928 | ||
929 | case FE_GET_FRONTEND: | |
930 | if (fe->ops->get_frontend) { | |
931 | memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters)); | |
932 | err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg); | |
933 | } | |
934 | break; | |
36cb557a AQ |
935 | |
936 | case FE_SET_FRONTEND_TUNE_MODE: | |
937 | fepriv->tune_mode_flags = (unsigned int) parg; | |
938 | break; | |
1da177e4 LT |
939 | }; |
940 | ||
941 | up (&fepriv->sem); | |
942 | return err; | |
943 | } | |
944 | ||
945 | static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) | |
946 | { | |
947 | struct dvb_device *dvbdev = file->private_data; | |
948 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 949 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
950 | |
951 | dprintk ("%s\n", __FUNCTION__); | |
952 | ||
953 | poll_wait (file, &fepriv->events.wait_queue, wait); | |
954 | ||
955 | if (fepriv->events.eventw != fepriv->events.eventr) | |
956 | return (POLLIN | POLLRDNORM | POLLPRI); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
961 | static int dvb_frontend_open(struct inode *inode, struct file *file) | |
962 | { | |
963 | struct dvb_device *dvbdev = file->private_data; | |
964 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 965 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
966 | int ret; |
967 | ||
968 | dprintk ("%s\n", __FUNCTION__); | |
969 | ||
970 | if ((ret = dvb_generic_open (inode, file)) < 0) | |
971 | return ret; | |
972 | ||
973 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) { | |
974 | ret = dvb_frontend_start (fe); | |
975 | if (ret) | |
976 | dvb_generic_release (inode, file); | |
977 | ||
978 | /* empty event queue */ | |
979 | fepriv->events.eventr = fepriv->events.eventw = 0; | |
36cb557a AQ |
980 | |
981 | /* normal tune mode when opened R/W */ | |
982 | fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT; | |
1da177e4 LT |
983 | } |
984 | ||
985 | return ret; | |
986 | } | |
987 | ||
988 | static int dvb_frontend_release(struct inode *inode, struct file *file) | |
989 | { | |
990 | struct dvb_device *dvbdev = file->private_data; | |
991 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 992 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
993 | |
994 | dprintk ("%s\n", __FUNCTION__); | |
995 | ||
996 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) | |
997 | fepriv->release_jiffies = jiffies; | |
998 | ||
999 | return dvb_generic_release (inode, file); | |
1000 | } | |
1001 | ||
1002 | static struct file_operations dvb_frontend_fops = { | |
1003 | .owner = THIS_MODULE, | |
1004 | .ioctl = dvb_generic_ioctl, | |
1005 | .poll = dvb_frontend_poll, | |
1006 | .open = dvb_frontend_open, | |
1007 | .release = dvb_frontend_release | |
1008 | }; | |
1009 | ||
1010 | int dvb_register_frontend(struct dvb_adapter* dvb, | |
1011 | struct dvb_frontend* fe) | |
1012 | { | |
1013 | struct dvb_frontend_private *fepriv; | |
1014 | static const struct dvb_device dvbdev_template = { | |
1015 | .users = ~0, | |
1016 | .writers = 1, | |
1017 | .readers = (~0)-1, | |
1018 | .fops = &dvb_frontend_fops, | |
1019 | .kernel_ioctl = dvb_frontend_ioctl | |
1020 | }; | |
1021 | ||
1022 | dprintk ("%s\n", __FUNCTION__); | |
1023 | ||
1024 | if (down_interruptible (&frontend_mutex)) | |
1025 | return -ERESTARTSYS; | |
1026 | ||
1027 | fe->frontend_priv = kmalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); | |
1028 | if (fe->frontend_priv == NULL) { | |
1029 | up(&frontend_mutex); | |
1030 | return -ENOMEM; | |
1031 | } | |
0c53c70f | 1032 | fepriv = fe->frontend_priv; |
1da177e4 LT |
1033 | memset(fe->frontend_priv, 0, sizeof(struct dvb_frontend_private)); |
1034 | ||
1035 | init_MUTEX (&fepriv->sem); | |
1036 | init_waitqueue_head (&fepriv->wait_queue); | |
1037 | init_waitqueue_head (&fepriv->events.wait_queue); | |
1038 | init_MUTEX (&fepriv->events.sem); | |
1039 | fe->dvb = dvb; | |
1040 | fepriv->inversion = INVERSION_OFF; | |
1041 | ||
1042 | printk ("DVB: registering frontend %i (%s)...\n", | |
1043 | fe->dvb->num, | |
1044 | fe->ops->info.name); | |
1045 | ||
1046 | dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template, | |
1047 | fe, DVB_DEVICE_FRONTEND); | |
1048 | ||
1049 | up (&frontend_mutex); | |
1050 | return 0; | |
1051 | } | |
1052 | EXPORT_SYMBOL(dvb_register_frontend); | |
1053 | ||
1054 | int dvb_unregister_frontend(struct dvb_frontend* fe) | |
1055 | { | |
0c53c70f | 1056 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
1057 | dprintk ("%s\n", __FUNCTION__); |
1058 | ||
1059 | down (&frontend_mutex); | |
1060 | dvb_unregister_device (fepriv->dvbdev); | |
1061 | dvb_frontend_stop (fe); | |
1062 | if (fe->ops->release) | |
1063 | fe->ops->release(fe); | |
1064 | else | |
1065 | printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name); | |
1066 | /* fe is invalid now */ | |
1067 | kfree(fepriv); | |
1068 | up (&frontend_mutex); | |
1069 | return 0; | |
1070 | } | |
1071 | EXPORT_SYMBOL(dvb_unregister_frontend); |