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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 | 39 | #include <asm/processor.h> |
1da177e4 LT |
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); | |
f4f009a7 | 51 | MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off)."); |
1da177e4 LT |
52 | module_param(dvb_shutdown_timeout, int, 0444); |
53 | MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); | |
54 | module_param(dvb_force_auto_inversion, int, 0444); | |
55 | MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); | |
56 | module_param(dvb_override_tune_delay, int, 0444); | |
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, 0444); | |
59 | MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage 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 | * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling. | |
77 | * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune. | |
78 | * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress. | |
79 | * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower. | |
80 | * FESTATE_TUNED. The frontend has successfully locked on. | |
81 | * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it. | |
82 | * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower. | |
83 | * FESTATE_DISEQC. A DISEQC command has just been issued. | |
84 | * FESTATE_WAITFORLOCK. When we're waiting for a lock. | |
85 | * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan. | |
86 | * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan. | |
87 | * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again. | |
88 | */ | |
89 | ||
3593cab5 | 90 | static DEFINE_MUTEX(frontend_mutex); |
1da177e4 LT |
91 | |
92 | struct dvb_frontend_private { | |
93 | ||
36cb557a | 94 | /* thread/frontend values */ |
1da177e4 LT |
95 | struct dvb_device *dvbdev; |
96 | struct dvb_frontend_parameters parameters; | |
97 | struct dvb_fe_events events; | |
98 | struct semaphore sem; | |
99 | struct list_head list_head; | |
100 | wait_queue_head_t wait_queue; | |
101 | pid_t thread_pid; | |
102 | unsigned long release_jiffies; | |
36cb557a AQ |
103 | unsigned int exit; |
104 | unsigned int wakeup; | |
1da177e4 | 105 | fe_status_t status; |
400b7083 | 106 | unsigned long tune_mode_flags; |
36cb557a AQ |
107 | unsigned int delay; |
108 | ||
109 | /* swzigzag values */ | |
110 | unsigned int state; | |
111 | unsigned int bending; | |
112 | int lnb_drift; | |
113 | unsigned int inversion; | |
114 | unsigned int auto_step; | |
115 | unsigned int auto_sub_step; | |
116 | unsigned int started_auto_step; | |
117 | unsigned int min_delay; | |
118 | unsigned int max_drift; | |
119 | unsigned int step_size; | |
120 | int quality; | |
121 | unsigned int check_wrapped; | |
1da177e4 LT |
122 | }; |
123 | ||
124 | ||
125 | static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) | |
126 | { | |
0c53c70f | 127 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
128 | struct dvb_fe_events *events = &fepriv->events; |
129 | struct dvb_frontend_event *e; | |
130 | int wp; | |
131 | ||
132 | dprintk ("%s\n", __FUNCTION__); | |
133 | ||
134 | if (down_interruptible (&events->sem)) | |
135 | return; | |
136 | ||
137 | wp = (events->eventw + 1) % MAX_EVENT; | |
138 | ||
139 | if (wp == events->eventr) { | |
140 | events->overflow = 1; | |
141 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
142 | } | |
143 | ||
144 | e = &events->events[events->eventw]; | |
145 | ||
146 | memcpy (&e->parameters, &fepriv->parameters, | |
147 | sizeof (struct dvb_frontend_parameters)); | |
148 | ||
149 | if (status & FE_HAS_LOCK) | |
150 | if (fe->ops->get_frontend) | |
151 | fe->ops->get_frontend(fe, &e->parameters); | |
152 | ||
153 | events->eventw = wp; | |
154 | ||
155 | up (&events->sem); | |
156 | ||
157 | e->status = status; | |
158 | ||
159 | wake_up_interruptible (&events->wait_queue); | |
160 | } | |
161 | ||
162 | static int dvb_frontend_get_event(struct dvb_frontend *fe, | |
163 | struct dvb_frontend_event *event, int flags) | |
164 | { | |
0c53c70f | 165 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
166 | struct dvb_fe_events *events = &fepriv->events; |
167 | ||
168 | dprintk ("%s\n", __FUNCTION__); | |
169 | ||
170 | if (events->overflow) { | |
171 | events->overflow = 0; | |
172 | return -EOVERFLOW; | |
173 | } | |
174 | ||
175 | if (events->eventw == events->eventr) { | |
176 | int ret; | |
177 | ||
178 | if (flags & O_NONBLOCK) | |
179 | return -EWOULDBLOCK; | |
180 | ||
181 | up(&fepriv->sem); | |
182 | ||
183 | ret = wait_event_interruptible (events->wait_queue, | |
184 | events->eventw != events->eventr); | |
185 | ||
186 | if (down_interruptible (&fepriv->sem)) | |
187 | return -ERESTARTSYS; | |
188 | ||
189 | if (ret < 0) | |
190 | return ret; | |
191 | } | |
192 | ||
193 | if (down_interruptible (&events->sem)) | |
194 | return -ERESTARTSYS; | |
195 | ||
196 | memcpy (event, &events->events[events->eventr], | |
197 | sizeof(struct dvb_frontend_event)); | |
198 | ||
199 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
200 | ||
201 | up (&events->sem); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static void dvb_frontend_init(struct dvb_frontend *fe) | |
207 | { | |
208 | dprintk ("DVB: initialising frontend %i (%s)...\n", | |
209 | fe->dvb->num, | |
210 | fe->ops->info.name); | |
211 | ||
212 | if (fe->ops->init) | |
213 | fe->ops->init(fe); | |
214 | } | |
215 | ||
36cb557a | 216 | static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked) |
1da177e4 | 217 | { |
36cb557a | 218 | int q2; |
1da177e4 | 219 | |
36cb557a | 220 | dprintk ("%s\n", __FUNCTION__); |
1da177e4 | 221 | |
36cb557a AQ |
222 | if (locked) |
223 | (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256; | |
224 | else | |
225 | (fepriv->quality) = (fepriv->quality * 220 + 0) / 256; | |
1da177e4 | 226 | |
36cb557a AQ |
227 | q2 = fepriv->quality - 128; |
228 | q2 *= q2; | |
1da177e4 | 229 | |
36cb557a | 230 | fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128); |
1da177e4 LT |
231 | } |
232 | ||
233 | /** | |
234 | * Performs automatic twiddling of frontend parameters. | |
235 | * | |
236 | * @param fe The frontend concerned. | |
237 | * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT | |
238 | * @returns Number of complete iterations that have been performed. | |
239 | */ | |
36cb557a | 240 | static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped) |
1da177e4 LT |
241 | { |
242 | int autoinversion; | |
243 | int ready = 0; | |
0c53c70f | 244 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
245 | int original_inversion = fepriv->parameters.inversion; |
246 | u32 original_frequency = fepriv->parameters.frequency; | |
247 | ||
248 | /* are we using autoinversion? */ | |
249 | autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
250 | (fepriv->parameters.inversion == INVERSION_AUTO)); | |
251 | ||
252 | /* setup parameters correctly */ | |
253 | while(!ready) { | |
254 | /* calculate the lnb_drift */ | |
255 | fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; | |
256 | ||
257 | /* wrap the auto_step if we've exceeded the maximum drift */ | |
258 | if (fepriv->lnb_drift > fepriv->max_drift) { | |
259 | fepriv->auto_step = 0; | |
260 | fepriv->auto_sub_step = 0; | |
261 | fepriv->lnb_drift = 0; | |
262 | } | |
263 | ||
264 | /* perform inversion and +/- zigzag */ | |
265 | switch(fepriv->auto_sub_step) { | |
266 | case 0: | |
267 | /* try with the current inversion and current drift setting */ | |
268 | ready = 1; | |
269 | break; | |
270 | ||
271 | case 1: | |
272 | if (!autoinversion) break; | |
273 | ||
274 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
275 | ready = 1; | |
276 | break; | |
277 | ||
278 | case 2: | |
279 | if (fepriv->lnb_drift == 0) break; | |
280 | ||
281 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
282 | ready = 1; | |
283 | break; | |
284 | ||
285 | case 3: | |
286 | if (fepriv->lnb_drift == 0) break; | |
287 | if (!autoinversion) break; | |
288 | ||
289 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
290 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
291 | ready = 1; | |
292 | break; | |
293 | ||
294 | default: | |
295 | fepriv->auto_step++; | |
296 | fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ | |
297 | break; | |
298 | } | |
299 | ||
300 | if (!ready) fepriv->auto_sub_step++; | |
301 | } | |
302 | ||
303 | /* if this attempt would hit where we started, indicate a complete | |
304 | * iteration has occurred */ | |
305 | if ((fepriv->auto_step == fepriv->started_auto_step) && | |
306 | (fepriv->auto_sub_step == 0) && check_wrapped) { | |
307 | return 1; | |
308 | } | |
309 | ||
310 | dprintk("%s: drift:%i inversion:%i auto_step:%i " | |
311 | "auto_sub_step:%i started_auto_step:%i\n", | |
312 | __FUNCTION__, fepriv->lnb_drift, fepriv->inversion, | |
313 | fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step); | |
314 | ||
315 | /* set the frontend itself */ | |
316 | fepriv->parameters.frequency += fepriv->lnb_drift; | |
317 | if (autoinversion) | |
318 | fepriv->parameters.inversion = fepriv->inversion; | |
319 | if (fe->ops->set_frontend) | |
320 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
321 | ||
322 | fepriv->parameters.frequency = original_frequency; | |
323 | fepriv->parameters.inversion = original_inversion; | |
324 | ||
325 | fepriv->auto_sub_step++; | |
326 | return 0; | |
327 | } | |
328 | ||
36cb557a AQ |
329 | static void dvb_frontend_swzigzag(struct dvb_frontend *fe) |
330 | { | |
331 | fe_status_t s; | |
332 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
333 | ||
334 | /* if we've got no parameters, just keep idling */ | |
335 | if (fepriv->state & FESTATE_IDLE) { | |
336 | fepriv->delay = 3*HZ; | |
337 | fepriv->quality = 0; | |
338 | return; | |
339 | } | |
340 | ||
341 | /* in SCAN mode, we just set the frontend when asked and leave it alone */ | |
342 | if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) { | |
343 | if (fepriv->state & FESTATE_RETUNE) { | |
344 | if (fe->ops->set_frontend) | |
345 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
346 | fepriv->state = FESTATE_TUNED; | |
347 | } | |
348 | fepriv->delay = 3*HZ; | |
349 | fepriv->quality = 0; | |
350 | return; | |
351 | } | |
352 | ||
353 | /* get the frontend status */ | |
354 | if (fepriv->state & FESTATE_RETUNE) { | |
355 | s = 0; | |
356 | } else { | |
357 | if (fe->ops->read_status) | |
358 | fe->ops->read_status(fe, &s); | |
359 | if (s != fepriv->status) { | |
360 | dvb_frontend_add_event(fe, s); | |
361 | fepriv->status = s; | |
362 | } | |
363 | } | |
364 | ||
365 | /* if we're not tuned, and we have a lock, move to the TUNED state */ | |
366 | if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { | |
367 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
368 | fepriv->state = FESTATE_TUNED; | |
369 | ||
370 | /* if we're tuned, then we have determined the correct inversion */ | |
371 | if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
372 | (fepriv->parameters.inversion == INVERSION_AUTO)) { | |
373 | fepriv->parameters.inversion = fepriv->inversion; | |
374 | } | |
375 | return; | |
376 | } | |
377 | ||
378 | /* if we are tuned already, check we're still locked */ | |
379 | if (fepriv->state & FESTATE_TUNED) { | |
380 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
381 | ||
382 | /* we're tuned, and the lock is still good... */ | |
383 | if (s & FE_HAS_LOCK) { | |
384 | return; | |
385 | } else { /* if we _WERE_ tuned, but now don't have a lock */ | |
386 | fepriv->state = FESTATE_ZIGZAG_FAST; | |
387 | fepriv->started_auto_step = fepriv->auto_step; | |
388 | fepriv->check_wrapped = 0; | |
389 | } | |
390 | } | |
391 | ||
392 | /* don't actually do anything if we're in the LOSTLOCK state, | |
393 | * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ | |
394 | if ((fepriv->state & FESTATE_LOSTLOCK) && | |
395 | (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { | |
396 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
397 | return; | |
398 | } | |
399 | ||
400 | /* don't do anything if we're in the DISEQC state, since this | |
401 | * might be someone with a motorized dish controlled by DISEQC. | |
402 | * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ | |
403 | if (fepriv->state & FESTATE_DISEQC) { | |
404 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
405 | return; | |
406 | } | |
407 | ||
408 | /* if we're in the RETUNE state, set everything up for a brand | |
409 | * new scan, keeping the current inversion setting, as the next | |
410 | * tune is _very_ likely to require the same */ | |
411 | if (fepriv->state & FESTATE_RETUNE) { | |
412 | fepriv->lnb_drift = 0; | |
413 | fepriv->auto_step = 0; | |
414 | fepriv->auto_sub_step = 0; | |
415 | fepriv->started_auto_step = 0; | |
416 | fepriv->check_wrapped = 0; | |
417 | } | |
418 | ||
419 | /* fast zigzag. */ | |
420 | if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { | |
421 | fepriv->delay = fepriv->min_delay; | |
422 | ||
423 | /* peform a tune */ | |
424 | if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) { | |
425 | /* OK, if we've run out of trials at the fast speed. | |
426 | * Drop back to slow for the _next_ attempt */ | |
427 | fepriv->state = FESTATE_SEARCHING_SLOW; | |
428 | fepriv->started_auto_step = fepriv->auto_step; | |
429 | return; | |
430 | } | |
431 | fepriv->check_wrapped = 1; | |
432 | ||
433 | /* if we've just retuned, enter the ZIGZAG_FAST state. | |
434 | * This ensures we cannot return from an | |
435 | * FE_SET_FRONTEND ioctl before the first frontend tune | |
436 | * occurs */ | |
437 | if (fepriv->state & FESTATE_RETUNE) { | |
438 | fepriv->state = FESTATE_TUNING_FAST; | |
439 | } | |
440 | } | |
441 | ||
442 | /* slow zigzag */ | |
443 | if (fepriv->state & FESTATE_SEARCHING_SLOW) { | |
444 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
445 | ||
446 | /* Note: don't bother checking for wrapping; we stay in this | |
447 | * state until we get a lock */ | |
448 | dvb_frontend_swzigzag_autotune(fe, 0); | |
449 | } | |
450 | } | |
451 | ||
1da177e4 LT |
452 | static int dvb_frontend_is_exiting(struct dvb_frontend *fe) |
453 | { | |
0c53c70f | 454 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
455 | |
456 | if (fepriv->exit) | |
457 | return 1; | |
458 | ||
459 | if (fepriv->dvbdev->writers == 1) | |
cc89c229 | 460 | if (time_after(jiffies, fepriv->release_jiffies + |
36cb557a | 461 | dvb_shutdown_timeout * HZ)) |
1da177e4 LT |
462 | return 1; |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) | |
468 | { | |
0c53c70f | 469 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
470 | |
471 | if (fepriv->wakeup) { | |
472 | fepriv->wakeup = 0; | |
473 | return 1; | |
474 | } | |
475 | return dvb_frontend_is_exiting(fe); | |
476 | } | |
477 | ||
478 | static void dvb_frontend_wakeup(struct dvb_frontend *fe) | |
479 | { | |
0c53c70f | 480 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
481 | |
482 | fepriv->wakeup = 1; | |
483 | wake_up_interruptible(&fepriv->wait_queue); | |
484 | } | |
485 | ||
1da177e4 LT |
486 | static int dvb_frontend_thread(void *data) |
487 | { | |
0c53c70f JS |
488 | struct dvb_frontend *fe = data; |
489 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
1da177e4 LT |
490 | unsigned long timeout; |
491 | char name [15]; | |
1da177e4 | 492 | fe_status_t s; |
36cb557a | 493 | struct dvb_frontend_parameters *params; |
1da177e4 LT |
494 | |
495 | dprintk("%s\n", __FUNCTION__); | |
496 | ||
497 | snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num); | |
498 | ||
afd1a0c9 MCC |
499 | lock_kernel(); |
500 | daemonize(name); | |
501 | sigfillset(¤t->blocked); | |
502 | unlock_kernel(); | |
1da177e4 | 503 | |
36cb557a AQ |
504 | fepriv->check_wrapped = 0; |
505 | fepriv->quality = 0; | |
506 | fepriv->delay = 3*HZ; | |
1da177e4 LT |
507 | fepriv->status = 0; |
508 | dvb_frontend_init(fe); | |
509 | fepriv->wakeup = 0; | |
510 | ||
511 | while (1) { | |
512 | up(&fepriv->sem); /* is locked when we enter the thread... */ | |
513 | ||
514 | timeout = wait_event_interruptible_timeout(fepriv->wait_queue, | |
515 | dvb_frontend_should_wakeup(fe), | |
36cb557a | 516 | fepriv->delay); |
1da177e4 LT |
517 | if (0 != dvb_frontend_is_exiting(fe)) { |
518 | /* got signal or quitting */ | |
519 | break; | |
520 | } | |
521 | ||
3e1d1d28 | 522 | try_to_freeze(); |
1da177e4 LT |
523 | |
524 | if (down_interruptible(&fepriv->sem)) | |
525 | break; | |
526 | ||
36cb557a AQ |
527 | /* do an iteration of the tuning loop */ |
528 | if (fe->ops->tune) { | |
529 | /* have we been asked to retune? */ | |
530 | params = NULL; | |
531 | if (fepriv->state & FESTATE_RETUNE) { | |
532 | params = &fepriv->parameters; | |
533 | fepriv->state = FESTATE_TUNED; | |
534 | } | |
1da177e4 | 535 | |
36cb557a | 536 | fe->ops->tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s); |
1da177e4 LT |
537 | if (s != fepriv->status) { |
538 | dvb_frontend_add_event(fe, s); | |
539 | fepriv->status = s; | |
540 | } | |
36cb557a AQ |
541 | } else { |
542 | dvb_frontend_swzigzag(fe); | |
1da177e4 LT |
543 | } |
544 | } | |
545 | ||
546 | if (dvb_shutdown_timeout) { | |
547 | if (dvb_powerdown_on_sleep) | |
548 | if (fe->ops->set_voltage) | |
549 | fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF); | |
550 | if (fe->ops->sleep) | |
551 | fe->ops->sleep(fe); | |
552 | } | |
553 | ||
554 | fepriv->thread_pid = 0; | |
555 | mb(); | |
556 | ||
557 | dvb_frontend_wakeup(fe); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static void dvb_frontend_stop(struct dvb_frontend *fe) | |
562 | { | |
563 | unsigned long ret; | |
0c53c70f | 564 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
565 | |
566 | dprintk ("%s\n", __FUNCTION__); | |
567 | ||
568 | fepriv->exit = 1; | |
569 | mb(); | |
570 | ||
571 | if (!fepriv->thread_pid) | |
572 | return; | |
573 | ||
574 | /* check if the thread is really alive */ | |
575 | if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) { | |
576 | printk("dvb_frontend_stop: thread PID %d already died\n", | |
577 | fepriv->thread_pid); | |
578 | /* make sure the mutex was not held by the thread */ | |
579 | init_MUTEX (&fepriv->sem); | |
580 | return; | |
581 | } | |
582 | ||
583 | /* wake up the frontend thread, so it notices that fe->exit == 1 */ | |
584 | dvb_frontend_wakeup(fe); | |
585 | ||
586 | /* wait until the frontend thread has exited */ | |
587 | ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid); | |
588 | if (-ERESTARTSYS != ret) { | |
589 | fepriv->state = FESTATE_IDLE; | |
590 | return; | |
591 | } | |
592 | fepriv->state = FESTATE_IDLE; | |
593 | ||
594 | /* paranoia check in case a signal arrived */ | |
595 | if (fepriv->thread_pid) | |
596 | printk("dvb_frontend_stop: warning: thread PID %d won't exit\n", | |
597 | fepriv->thread_pid); | |
598 | } | |
599 | ||
83b75b04 N |
600 | s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) |
601 | { | |
602 | return ((curtime.tv_usec < lasttime.tv_usec) ? | |
603 | 1000000 - lasttime.tv_usec + curtime.tv_usec : | |
604 | curtime.tv_usec - lasttime.tv_usec); | |
605 | } | |
606 | EXPORT_SYMBOL(timeval_usec_diff); | |
607 | ||
608 | static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) | |
609 | { | |
610 | curtime->tv_usec += add_usec; | |
611 | if (curtime->tv_usec >= 1000000) { | |
612 | curtime->tv_usec -= 1000000; | |
613 | curtime->tv_sec++; | |
614 | } | |
615 | } | |
616 | ||
617 | /* | |
618 | * Sleep until gettimeofday() > waketime + add_usec | |
619 | * This needs to be as precise as possible, but as the delay is | |
620 | * usually between 2ms and 32ms, it is done using a scheduled msleep | |
621 | * followed by usleep (normally a busy-wait loop) for the remainder | |
622 | */ | |
623 | void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) | |
624 | { | |
625 | struct timeval lasttime; | |
626 | s32 delta, newdelta; | |
627 | ||
628 | timeval_usec_add(waketime, add_usec); | |
629 | ||
630 | do_gettimeofday(&lasttime); | |
631 | delta = timeval_usec_diff(lasttime, *waketime); | |
632 | if (delta > 2500) { | |
633 | msleep((delta - 1500) / 1000); | |
634 | do_gettimeofday(&lasttime); | |
635 | newdelta = timeval_usec_diff(lasttime, *waketime); | |
636 | delta = (newdelta > delta) ? 0 : newdelta; | |
637 | } | |
638 | if (delta > 0) | |
639 | udelay(delta); | |
640 | } | |
641 | EXPORT_SYMBOL(dvb_frontend_sleep_until); | |
642 | ||
1da177e4 LT |
643 | static int dvb_frontend_start(struct dvb_frontend *fe) |
644 | { | |
645 | int ret; | |
0c53c70f | 646 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
647 | |
648 | dprintk ("%s\n", __FUNCTION__); | |
649 | ||
650 | if (fepriv->thread_pid) { | |
651 | if (!fepriv->exit) | |
652 | return 0; | |
653 | else | |
654 | dvb_frontend_stop (fe); | |
655 | } | |
656 | ||
657 | if (signal_pending(current)) | |
658 | return -EINTR; | |
659 | if (down_interruptible (&fepriv->sem)) | |
660 | return -EINTR; | |
661 | ||
662 | fepriv->state = FESTATE_IDLE; | |
663 | fepriv->exit = 0; | |
664 | fepriv->thread_pid = 0; | |
665 | mb(); | |
666 | ||
667 | ret = kernel_thread (dvb_frontend_thread, fe, 0); | |
668 | ||
669 | if (ret < 0) { | |
670 | printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret); | |
671 | up(&fepriv->sem); | |
672 | return ret; | |
673 | } | |
674 | fepriv->thread_pid = ret; | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static int dvb_frontend_ioctl(struct inode *inode, struct file *file, | |
680 | unsigned int cmd, void *parg) | |
681 | { | |
682 | struct dvb_device *dvbdev = file->private_data; | |
683 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 684 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
685 | int err = -EOPNOTSUPP; |
686 | ||
687 | dprintk ("%s\n", __FUNCTION__); | |
688 | ||
689 | if (!fe || fepriv->exit) | |
690 | return -ENODEV; | |
691 | ||
692 | if ((file->f_flags & O_ACCMODE) == O_RDONLY && | |
693 | (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT || | |
694 | cmd == FE_DISEQC_RECV_SLAVE_REPLY)) | |
695 | return -EPERM; | |
696 | ||
697 | if (down_interruptible (&fepriv->sem)) | |
698 | return -ERESTARTSYS; | |
699 | ||
700 | switch (cmd) { | |
701 | case FE_GET_INFO: { | |
0c53c70f | 702 | struct dvb_frontend_info* info = parg; |
1da177e4 LT |
703 | memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info)); |
704 | ||
705 | /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't | |
706 | * do it, it is done for it. */ | |
707 | info->caps |= FE_CAN_INVERSION_AUTO; | |
708 | err = 0; | |
709 | break; | |
710 | } | |
711 | ||
6757ccc5 PB |
712 | case FE_READ_STATUS: { |
713 | fe_status_t* status = parg; | |
714 | ||
715 | /* if retune was requested but hasn't occured yet, prevent | |
716 | * that user get signal state from previous tuning */ | |
717 | if(fepriv->state == FESTATE_RETUNE) { | |
718 | err=0; | |
719 | *status = 0; | |
720 | break; | |
721 | } | |
722 | ||
1da177e4 | 723 | if (fe->ops->read_status) |
6757ccc5 | 724 | err = fe->ops->read_status(fe, status); |
1da177e4 | 725 | break; |
6757ccc5 | 726 | } |
1da177e4 LT |
727 | case FE_READ_BER: |
728 | if (fe->ops->read_ber) | |
729 | err = fe->ops->read_ber(fe, (__u32*) parg); | |
730 | break; | |
731 | ||
732 | case FE_READ_SIGNAL_STRENGTH: | |
733 | if (fe->ops->read_signal_strength) | |
734 | err = fe->ops->read_signal_strength(fe, (__u16*) parg); | |
735 | break; | |
736 | ||
737 | case FE_READ_SNR: | |
738 | if (fe->ops->read_snr) | |
739 | err = fe->ops->read_snr(fe, (__u16*) parg); | |
740 | break; | |
741 | ||
742 | case FE_READ_UNCORRECTED_BLOCKS: | |
743 | if (fe->ops->read_ucblocks) | |
744 | err = fe->ops->read_ucblocks(fe, (__u32*) parg); | |
745 | break; | |
746 | ||
747 | ||
748 | case FE_DISEQC_RESET_OVERLOAD: | |
749 | if (fe->ops->diseqc_reset_overload) { | |
750 | err = fe->ops->diseqc_reset_overload(fe); | |
751 | fepriv->state = FESTATE_DISEQC; | |
752 | fepriv->status = 0; | |
753 | } | |
754 | break; | |
755 | ||
756 | case FE_DISEQC_SEND_MASTER_CMD: | |
757 | if (fe->ops->diseqc_send_master_cmd) { | |
758 | err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg); | |
759 | fepriv->state = FESTATE_DISEQC; | |
760 | fepriv->status = 0; | |
761 | } | |
762 | break; | |
763 | ||
764 | case FE_DISEQC_SEND_BURST: | |
765 | if (fe->ops->diseqc_send_burst) { | |
766 | err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg); | |
767 | fepriv->state = FESTATE_DISEQC; | |
768 | fepriv->status = 0; | |
769 | } | |
770 | break; | |
771 | ||
772 | case FE_SET_TONE: | |
773 | if (fe->ops->set_tone) { | |
774 | err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg); | |
775 | fepriv->state = FESTATE_DISEQC; | |
776 | fepriv->status = 0; | |
777 | } | |
778 | break; | |
779 | ||
780 | case FE_SET_VOLTAGE: | |
781 | if (fe->ops->set_voltage) { | |
782 | err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg); | |
783 | fepriv->state = FESTATE_DISEQC; | |
784 | fepriv->status = 0; | |
785 | } | |
786 | break; | |
787 | ||
788 | case FE_DISHNETWORK_SEND_LEGACY_CMD: | |
789 | if (fe->ops->dishnetwork_send_legacy_command) { | |
e18828e4 | 790 | err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned long) parg); |
1da177e4 LT |
791 | fepriv->state = FESTATE_DISEQC; |
792 | fepriv->status = 0; | |
83b75b04 N |
793 | } else if (fe->ops->set_voltage) { |
794 | /* | |
795 | * NOTE: This is a fallback condition. Some frontends | |
796 | * (stv0299 for instance) take longer than 8msec to | |
797 | * respond to a set_voltage command. Those switches | |
798 | * need custom routines to switch properly. For all | |
799 | * other frontends, the following shoule work ok. | |
800 | * Dish network legacy switches (as used by Dish500) | |
801 | * are controlled by sending 9-bit command words | |
802 | * spaced 8msec apart. | |
803 | * the actual command word is switch/port dependant | |
804 | * so it is up to the userspace application to send | |
805 | * the right command. | |
806 | * The command must always start with a '0' after | |
807 | * initialization, so parg is 8 bits and does not | |
808 | * include the initialization or start bit | |
809 | */ | |
400b7083 | 810 | unsigned long cmd = ((unsigned long) parg) << 1; |
83b75b04 N |
811 | struct timeval nexttime; |
812 | struct timeval tv[10]; | |
813 | int i; | |
814 | u8 last = 1; | |
815 | if (dvb_frontend_debug) | |
400b7083 | 816 | printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd); |
83b75b04 N |
817 | do_gettimeofday(&nexttime); |
818 | if (dvb_frontend_debug) | |
819 | memcpy(&tv[0], &nexttime, sizeof(struct timeval)); | |
820 | /* before sending a command, initialize by sending | |
821 | * a 32ms 18V to the switch | |
822 | */ | |
823 | fe->ops->set_voltage(fe, SEC_VOLTAGE_18); | |
824 | dvb_frontend_sleep_until(&nexttime, 32000); | |
825 | ||
826 | for (i = 0; i < 9; i++) { | |
827 | if (dvb_frontend_debug) | |
828 | do_gettimeofday(&tv[i + 1]); | |
829 | if ((cmd & 0x01) != last) { | |
830 | /* set voltage to (last ? 13V : 18V) */ | |
831 | fe->ops->set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); | |
832 | last = (last) ? 0 : 1; | |
833 | } | |
834 | cmd = cmd >> 1; | |
835 | if (i != 8) | |
836 | dvb_frontend_sleep_until(&nexttime, 8000); | |
837 | } | |
838 | if (dvb_frontend_debug) { | |
839 | printk("%s(%d): switch delay (should be 32k followed by all 8k\n", | |
840 | __FUNCTION__, fe->dvb->num); | |
841 | for (i = 1; i < 10; i++) | |
842 | printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); | |
843 | } | |
844 | err = 0; | |
845 | fepriv->state = FESTATE_DISEQC; | |
846 | fepriv->status = 0; | |
1da177e4 LT |
847 | } |
848 | break; | |
849 | ||
850 | case FE_DISEQC_RECV_SLAVE_REPLY: | |
851 | if (fe->ops->diseqc_recv_slave_reply) | |
852 | err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg); | |
853 | break; | |
854 | ||
855 | case FE_ENABLE_HIGH_LNB_VOLTAGE: | |
856 | if (fe->ops->enable_high_lnb_voltage) | |
e18828e4 | 857 | err = fe->ops->enable_high_lnb_voltage(fe, (long) parg); |
1da177e4 LT |
858 | break; |
859 | ||
860 | case FE_SET_FRONTEND: { | |
861 | struct dvb_frontend_tune_settings fetunesettings; | |
862 | ||
863 | memcpy (&fepriv->parameters, parg, | |
864 | sizeof (struct dvb_frontend_parameters)); | |
865 | ||
866 | memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings)); | |
867 | memcpy(&fetunesettings.parameters, parg, | |
868 | sizeof (struct dvb_frontend_parameters)); | |
869 | ||
870 | /* force auto frequency inversion if requested */ | |
871 | if (dvb_force_auto_inversion) { | |
872 | fepriv->parameters.inversion = INVERSION_AUTO; | |
873 | fetunesettings.parameters.inversion = INVERSION_AUTO; | |
874 | } | |
875 | if (fe->ops->info.type == FE_OFDM) { | |
876 | /* without hierachical coding code_rate_LP is irrelevant, | |
877 | * so we tolerate the otherwise invalid FEC_NONE setting */ | |
878 | if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE && | |
879 | fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE) | |
880 | fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO; | |
881 | } | |
882 | ||
883 | /* get frontend-specific tuning settings */ | |
884 | if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) { | |
885 | fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; | |
886 | fepriv->max_drift = fetunesettings.max_drift; | |
887 | fepriv->step_size = fetunesettings.step_size; | |
888 | } else { | |
889 | /* default values */ | |
890 | switch(fe->ops->info.type) { | |
891 | case FE_QPSK: | |
892 | fepriv->min_delay = HZ/20; | |
893 | fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000; | |
894 | fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000; | |
895 | break; | |
896 | ||
897 | case FE_QAM: | |
898 | fepriv->min_delay = HZ/20; | |
899 | fepriv->step_size = 0; /* no zigzag */ | |
900 | fepriv->max_drift = 0; | |
901 | break; | |
902 | ||
903 | case FE_OFDM: | |
904 | fepriv->min_delay = HZ/20; | |
905 | fepriv->step_size = fe->ops->info.frequency_stepsize * 2; | |
906 | fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1; | |
907 | break; | |
908 | case FE_ATSC: | |
909 | printk("dvb-core: FE_ATSC not handled yet.\n"); | |
910 | break; | |
911 | } | |
912 | } | |
913 | if (dvb_override_tune_delay > 0) | |
914 | fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; | |
915 | ||
916 | fepriv->state = FESTATE_RETUNE; | |
917 | dvb_frontend_wakeup(fe); | |
918 | dvb_frontend_add_event(fe, 0); | |
919 | fepriv->status = 0; | |
920 | err = 0; | |
921 | break; | |
922 | } | |
923 | ||
924 | case FE_GET_EVENT: | |
925 | err = dvb_frontend_get_event (fe, parg, file->f_flags); | |
926 | break; | |
927 | ||
928 | case FE_GET_FRONTEND: | |
929 | if (fe->ops->get_frontend) { | |
930 | memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters)); | |
931 | err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg); | |
932 | } | |
933 | break; | |
36cb557a AQ |
934 | |
935 | case FE_SET_FRONTEND_TUNE_MODE: | |
e18828e4 | 936 | fepriv->tune_mode_flags = (unsigned long) parg; |
36cb557a | 937 | break; |
1da177e4 LT |
938 | }; |
939 | ||
940 | up (&fepriv->sem); | |
941 | return err; | |
942 | } | |
943 | ||
944 | static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) | |
945 | { | |
946 | struct dvb_device *dvbdev = file->private_data; | |
947 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 948 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
949 | |
950 | dprintk ("%s\n", __FUNCTION__); | |
951 | ||
952 | poll_wait (file, &fepriv->events.wait_queue, wait); | |
953 | ||
954 | if (fepriv->events.eventw != fepriv->events.eventr) | |
955 | return (POLLIN | POLLRDNORM | POLLPRI); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static int dvb_frontend_open(struct inode *inode, struct file *file) | |
961 | { | |
962 | struct dvb_device *dvbdev = file->private_data; | |
963 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 964 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
965 | int ret; |
966 | ||
967 | dprintk ("%s\n", __FUNCTION__); | |
968 | ||
969 | if ((ret = dvb_generic_open (inode, file)) < 0) | |
970 | return ret; | |
971 | ||
972 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) { | |
973 | ret = dvb_frontend_start (fe); | |
974 | if (ret) | |
975 | dvb_generic_release (inode, file); | |
976 | ||
977 | /* empty event queue */ | |
978 | fepriv->events.eventr = fepriv->events.eventw = 0; | |
36cb557a AQ |
979 | |
980 | /* normal tune mode when opened R/W */ | |
981 | fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT; | |
1da177e4 LT |
982 | } |
983 | ||
984 | return ret; | |
985 | } | |
986 | ||
987 | static int dvb_frontend_release(struct inode *inode, struct file *file) | |
988 | { | |
989 | struct dvb_device *dvbdev = file->private_data; | |
990 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 991 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
992 | |
993 | dprintk ("%s\n", __FUNCTION__); | |
994 | ||
995 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) | |
996 | fepriv->release_jiffies = jiffies; | |
997 | ||
998 | return dvb_generic_release (inode, file); | |
999 | } | |
1000 | ||
1001 | static struct file_operations dvb_frontend_fops = { | |
1002 | .owner = THIS_MODULE, | |
1003 | .ioctl = dvb_generic_ioctl, | |
1004 | .poll = dvb_frontend_poll, | |
1005 | .open = dvb_frontend_open, | |
1006 | .release = dvb_frontend_release | |
1007 | }; | |
1008 | ||
1009 | int dvb_register_frontend(struct dvb_adapter* dvb, | |
1010 | struct dvb_frontend* fe) | |
1011 | { | |
1012 | struct dvb_frontend_private *fepriv; | |
1013 | static const struct dvb_device dvbdev_template = { | |
1014 | .users = ~0, | |
1015 | .writers = 1, | |
1016 | .readers = (~0)-1, | |
1017 | .fops = &dvb_frontend_fops, | |
1018 | .kernel_ioctl = dvb_frontend_ioctl | |
1019 | }; | |
1020 | ||
1021 | dprintk ("%s\n", __FUNCTION__); | |
1022 | ||
3593cab5 | 1023 | if (mutex_lock_interruptible(&frontend_mutex)) |
1da177e4 LT |
1024 | return -ERESTARTSYS; |
1025 | ||
7408187d | 1026 | fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); |
1da177e4 | 1027 | if (fe->frontend_priv == NULL) { |
3593cab5 | 1028 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1029 | return -ENOMEM; |
1030 | } | |
0c53c70f | 1031 | fepriv = fe->frontend_priv; |
1da177e4 LT |
1032 | |
1033 | init_MUTEX (&fepriv->sem); | |
1034 | init_waitqueue_head (&fepriv->wait_queue); | |
1035 | init_waitqueue_head (&fepriv->events.wait_queue); | |
1036 | init_MUTEX (&fepriv->events.sem); | |
1037 | fe->dvb = dvb; | |
1038 | fepriv->inversion = INVERSION_OFF; | |
1039 | ||
1040 | printk ("DVB: registering frontend %i (%s)...\n", | |
1041 | fe->dvb->num, | |
1042 | fe->ops->info.name); | |
1043 | ||
1044 | dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template, | |
1045 | fe, DVB_DEVICE_FRONTEND); | |
1046 | ||
3593cab5 | 1047 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1048 | return 0; |
1049 | } | |
1050 | EXPORT_SYMBOL(dvb_register_frontend); | |
1051 | ||
1052 | int dvb_unregister_frontend(struct dvb_frontend* fe) | |
1053 | { | |
0c53c70f | 1054 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
1055 | dprintk ("%s\n", __FUNCTION__); |
1056 | ||
3593cab5 | 1057 | mutex_lock(&frontend_mutex); |
1da177e4 LT |
1058 | dvb_unregister_device (fepriv->dvbdev); |
1059 | dvb_frontend_stop (fe); | |
1060 | if (fe->ops->release) | |
1061 | fe->ops->release(fe); | |
1062 | else | |
1063 | printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name); | |
1064 | /* fe is invalid now */ | |
1065 | kfree(fepriv); | |
3593cab5 | 1066 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1067 | return 0; |
1068 | } | |
1069 | EXPORT_SYMBOL(dvb_unregister_frontend); |