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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)."); |
6baad3f0 | 52 | module_param(dvb_shutdown_timeout, int, 0644); |
1da177e4 | 53 | MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); |
6baad3f0 | 54 | module_param(dvb_force_auto_inversion, int, 0644); |
1da177e4 | 55 | MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); |
6baad3f0 | 56 | module_param(dvb_override_tune_delay, int, 0644); |
1da177e4 | 57 | MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt"); |
6baad3f0 | 58 | module_param(dvb_powerdown_on_sleep, int, 0644); |
1da177e4 LT |
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 | 107 | unsigned int delay; |
86f40cc3 | 108 | unsigned int reinitialise; |
36cb557a AQ |
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 | ||
86f40cc3 | 125 | static void dvb_frontend_wakeup(struct dvb_frontend *fe); |
1da177e4 LT |
126 | |
127 | static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) | |
128 | { | |
0c53c70f | 129 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
130 | struct dvb_fe_events *events = &fepriv->events; |
131 | struct dvb_frontend_event *e; | |
132 | int wp; | |
133 | ||
134 | dprintk ("%s\n", __FUNCTION__); | |
135 | ||
136 | if (down_interruptible (&events->sem)) | |
137 | return; | |
138 | ||
139 | wp = (events->eventw + 1) % MAX_EVENT; | |
140 | ||
141 | if (wp == events->eventr) { | |
142 | events->overflow = 1; | |
143 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
144 | } | |
145 | ||
146 | e = &events->events[events->eventw]; | |
147 | ||
148 | memcpy (&e->parameters, &fepriv->parameters, | |
149 | sizeof (struct dvb_frontend_parameters)); | |
150 | ||
151 | if (status & FE_HAS_LOCK) | |
152 | if (fe->ops->get_frontend) | |
153 | fe->ops->get_frontend(fe, &e->parameters); | |
154 | ||
155 | events->eventw = wp; | |
156 | ||
157 | up (&events->sem); | |
158 | ||
159 | e->status = status; | |
160 | ||
161 | wake_up_interruptible (&events->wait_queue); | |
162 | } | |
163 | ||
164 | static int dvb_frontend_get_event(struct dvb_frontend *fe, | |
165 | struct dvb_frontend_event *event, int flags) | |
166 | { | |
0c53c70f | 167 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
168 | struct dvb_fe_events *events = &fepriv->events; |
169 | ||
170 | dprintk ("%s\n", __FUNCTION__); | |
171 | ||
172 | if (events->overflow) { | |
173 | events->overflow = 0; | |
174 | return -EOVERFLOW; | |
175 | } | |
176 | ||
177 | if (events->eventw == events->eventr) { | |
178 | int ret; | |
179 | ||
180 | if (flags & O_NONBLOCK) | |
181 | return -EWOULDBLOCK; | |
182 | ||
183 | up(&fepriv->sem); | |
184 | ||
185 | ret = wait_event_interruptible (events->wait_queue, | |
186 | events->eventw != events->eventr); | |
187 | ||
188 | if (down_interruptible (&fepriv->sem)) | |
189 | return -ERESTARTSYS; | |
190 | ||
191 | if (ret < 0) | |
192 | return ret; | |
193 | } | |
194 | ||
195 | if (down_interruptible (&events->sem)) | |
196 | return -ERESTARTSYS; | |
197 | ||
198 | memcpy (event, &events->events[events->eventr], | |
199 | sizeof(struct dvb_frontend_event)); | |
200 | ||
201 | events->eventr = (events->eventr + 1) % MAX_EVENT; | |
202 | ||
203 | up (&events->sem); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static void dvb_frontend_init(struct dvb_frontend *fe) | |
209 | { | |
210 | dprintk ("DVB: initialising frontend %i (%s)...\n", | |
211 | fe->dvb->num, | |
212 | fe->ops->info.name); | |
213 | ||
214 | if (fe->ops->init) | |
215 | fe->ops->init(fe); | |
216 | } | |
217 | ||
86f40cc3 AQ |
218 | void dvb_frontend_reinitialise(struct dvb_frontend *fe) |
219 | { | |
220 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
221 | ||
222 | fepriv->reinitialise = 1; | |
223 | dvb_frontend_wakeup(fe); | |
224 | } | |
225 | EXPORT_SYMBOL(dvb_frontend_reinitialise); | |
226 | ||
36cb557a | 227 | static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked) |
1da177e4 | 228 | { |
36cb557a | 229 | int q2; |
1da177e4 | 230 | |
36cb557a | 231 | dprintk ("%s\n", __FUNCTION__); |
1da177e4 | 232 | |
36cb557a AQ |
233 | if (locked) |
234 | (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256; | |
235 | else | |
236 | (fepriv->quality) = (fepriv->quality * 220 + 0) / 256; | |
1da177e4 | 237 | |
36cb557a AQ |
238 | q2 = fepriv->quality - 128; |
239 | q2 *= q2; | |
1da177e4 | 240 | |
36cb557a | 241 | fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128); |
1da177e4 LT |
242 | } |
243 | ||
244 | /** | |
245 | * Performs automatic twiddling of frontend parameters. | |
246 | * | |
247 | * @param fe The frontend concerned. | |
248 | * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT | |
249 | * @returns Number of complete iterations that have been performed. | |
250 | */ | |
36cb557a | 251 | static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped) |
1da177e4 LT |
252 | { |
253 | int autoinversion; | |
254 | int ready = 0; | |
0c53c70f | 255 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
256 | int original_inversion = fepriv->parameters.inversion; |
257 | u32 original_frequency = fepriv->parameters.frequency; | |
258 | ||
259 | /* are we using autoinversion? */ | |
260 | autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
261 | (fepriv->parameters.inversion == INVERSION_AUTO)); | |
262 | ||
263 | /* setup parameters correctly */ | |
264 | while(!ready) { | |
265 | /* calculate the lnb_drift */ | |
266 | fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; | |
267 | ||
268 | /* wrap the auto_step if we've exceeded the maximum drift */ | |
269 | if (fepriv->lnb_drift > fepriv->max_drift) { | |
270 | fepriv->auto_step = 0; | |
271 | fepriv->auto_sub_step = 0; | |
272 | fepriv->lnb_drift = 0; | |
273 | } | |
274 | ||
275 | /* perform inversion and +/- zigzag */ | |
276 | switch(fepriv->auto_sub_step) { | |
277 | case 0: | |
278 | /* try with the current inversion and current drift setting */ | |
279 | ready = 1; | |
280 | break; | |
281 | ||
282 | case 1: | |
283 | if (!autoinversion) break; | |
284 | ||
285 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
286 | ready = 1; | |
287 | break; | |
288 | ||
289 | case 2: | |
290 | if (fepriv->lnb_drift == 0) break; | |
291 | ||
292 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
293 | ready = 1; | |
294 | break; | |
295 | ||
296 | case 3: | |
297 | if (fepriv->lnb_drift == 0) break; | |
298 | if (!autoinversion) break; | |
299 | ||
300 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; | |
301 | fepriv->lnb_drift = -fepriv->lnb_drift; | |
302 | ready = 1; | |
303 | break; | |
304 | ||
305 | default: | |
306 | fepriv->auto_step++; | |
307 | fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ | |
308 | break; | |
309 | } | |
310 | ||
311 | if (!ready) fepriv->auto_sub_step++; | |
312 | } | |
313 | ||
314 | /* if this attempt would hit where we started, indicate a complete | |
315 | * iteration has occurred */ | |
316 | if ((fepriv->auto_step == fepriv->started_auto_step) && | |
317 | (fepriv->auto_sub_step == 0) && check_wrapped) { | |
318 | return 1; | |
319 | } | |
320 | ||
321 | dprintk("%s: drift:%i inversion:%i auto_step:%i " | |
322 | "auto_sub_step:%i started_auto_step:%i\n", | |
323 | __FUNCTION__, fepriv->lnb_drift, fepriv->inversion, | |
324 | fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step); | |
325 | ||
326 | /* set the frontend itself */ | |
327 | fepriv->parameters.frequency += fepriv->lnb_drift; | |
328 | if (autoinversion) | |
329 | fepriv->parameters.inversion = fepriv->inversion; | |
330 | if (fe->ops->set_frontend) | |
331 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
332 | ||
333 | fepriv->parameters.frequency = original_frequency; | |
334 | fepriv->parameters.inversion = original_inversion; | |
335 | ||
336 | fepriv->auto_sub_step++; | |
337 | return 0; | |
338 | } | |
339 | ||
36cb557a AQ |
340 | static void dvb_frontend_swzigzag(struct dvb_frontend *fe) |
341 | { | |
342 | fe_status_t s; | |
343 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
344 | ||
345 | /* if we've got no parameters, just keep idling */ | |
346 | if (fepriv->state & FESTATE_IDLE) { | |
347 | fepriv->delay = 3*HZ; | |
348 | fepriv->quality = 0; | |
349 | return; | |
350 | } | |
351 | ||
352 | /* in SCAN mode, we just set the frontend when asked and leave it alone */ | |
353 | if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) { | |
354 | if (fepriv->state & FESTATE_RETUNE) { | |
355 | if (fe->ops->set_frontend) | |
356 | fe->ops->set_frontend(fe, &fepriv->parameters); | |
357 | fepriv->state = FESTATE_TUNED; | |
358 | } | |
359 | fepriv->delay = 3*HZ; | |
360 | fepriv->quality = 0; | |
361 | return; | |
362 | } | |
363 | ||
364 | /* get the frontend status */ | |
365 | if (fepriv->state & FESTATE_RETUNE) { | |
366 | s = 0; | |
367 | } else { | |
368 | if (fe->ops->read_status) | |
369 | fe->ops->read_status(fe, &s); | |
370 | if (s != fepriv->status) { | |
371 | dvb_frontend_add_event(fe, s); | |
372 | fepriv->status = s; | |
373 | } | |
374 | } | |
375 | ||
376 | /* if we're not tuned, and we have a lock, move to the TUNED state */ | |
377 | if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { | |
378 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
379 | fepriv->state = FESTATE_TUNED; | |
380 | ||
381 | /* if we're tuned, then we have determined the correct inversion */ | |
382 | if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && | |
383 | (fepriv->parameters.inversion == INVERSION_AUTO)) { | |
384 | fepriv->parameters.inversion = fepriv->inversion; | |
385 | } | |
386 | return; | |
387 | } | |
388 | ||
389 | /* if we are tuned already, check we're still locked */ | |
390 | if (fepriv->state & FESTATE_TUNED) { | |
391 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
392 | ||
393 | /* we're tuned, and the lock is still good... */ | |
394 | if (s & FE_HAS_LOCK) { | |
395 | return; | |
396 | } else { /* if we _WERE_ tuned, but now don't have a lock */ | |
397 | fepriv->state = FESTATE_ZIGZAG_FAST; | |
398 | fepriv->started_auto_step = fepriv->auto_step; | |
399 | fepriv->check_wrapped = 0; | |
400 | } | |
401 | } | |
402 | ||
403 | /* don't actually do anything if we're in the LOSTLOCK state, | |
404 | * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ | |
405 | if ((fepriv->state & FESTATE_LOSTLOCK) && | |
406 | (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { | |
407 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
408 | return; | |
409 | } | |
410 | ||
411 | /* don't do anything if we're in the DISEQC state, since this | |
412 | * might be someone with a motorized dish controlled by DISEQC. | |
413 | * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ | |
414 | if (fepriv->state & FESTATE_DISEQC) { | |
415 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
416 | return; | |
417 | } | |
418 | ||
419 | /* if we're in the RETUNE state, set everything up for a brand | |
420 | * new scan, keeping the current inversion setting, as the next | |
421 | * tune is _very_ likely to require the same */ | |
422 | if (fepriv->state & FESTATE_RETUNE) { | |
423 | fepriv->lnb_drift = 0; | |
424 | fepriv->auto_step = 0; | |
425 | fepriv->auto_sub_step = 0; | |
426 | fepriv->started_auto_step = 0; | |
427 | fepriv->check_wrapped = 0; | |
428 | } | |
429 | ||
430 | /* fast zigzag. */ | |
431 | if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { | |
432 | fepriv->delay = fepriv->min_delay; | |
433 | ||
434 | /* peform a tune */ | |
435 | if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) { | |
436 | /* OK, if we've run out of trials at the fast speed. | |
437 | * Drop back to slow for the _next_ attempt */ | |
438 | fepriv->state = FESTATE_SEARCHING_SLOW; | |
439 | fepriv->started_auto_step = fepriv->auto_step; | |
440 | return; | |
441 | } | |
442 | fepriv->check_wrapped = 1; | |
443 | ||
444 | /* if we've just retuned, enter the ZIGZAG_FAST state. | |
445 | * This ensures we cannot return from an | |
446 | * FE_SET_FRONTEND ioctl before the first frontend tune | |
447 | * occurs */ | |
448 | if (fepriv->state & FESTATE_RETUNE) { | |
449 | fepriv->state = FESTATE_TUNING_FAST; | |
450 | } | |
451 | } | |
452 | ||
453 | /* slow zigzag */ | |
454 | if (fepriv->state & FESTATE_SEARCHING_SLOW) { | |
455 | dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); | |
456 | ||
457 | /* Note: don't bother checking for wrapping; we stay in this | |
458 | * state until we get a lock */ | |
459 | dvb_frontend_swzigzag_autotune(fe, 0); | |
460 | } | |
461 | } | |
462 | ||
1da177e4 LT |
463 | static int dvb_frontend_is_exiting(struct dvb_frontend *fe) |
464 | { | |
0c53c70f | 465 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
466 | |
467 | if (fepriv->exit) | |
468 | return 1; | |
469 | ||
470 | if (fepriv->dvbdev->writers == 1) | |
cc89c229 | 471 | if (time_after(jiffies, fepriv->release_jiffies + |
36cb557a | 472 | dvb_shutdown_timeout * HZ)) |
1da177e4 LT |
473 | return 1; |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) | |
479 | { | |
0c53c70f | 480 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
481 | |
482 | if (fepriv->wakeup) { | |
483 | fepriv->wakeup = 0; | |
484 | return 1; | |
485 | } | |
486 | return dvb_frontend_is_exiting(fe); | |
487 | } | |
488 | ||
489 | static void dvb_frontend_wakeup(struct dvb_frontend *fe) | |
490 | { | |
0c53c70f | 491 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
492 | |
493 | fepriv->wakeup = 1; | |
494 | wake_up_interruptible(&fepriv->wait_queue); | |
495 | } | |
496 | ||
1da177e4 LT |
497 | static int dvb_frontend_thread(void *data) |
498 | { | |
0c53c70f JS |
499 | struct dvb_frontend *fe = data; |
500 | struct dvb_frontend_private *fepriv = fe->frontend_priv; | |
1da177e4 LT |
501 | unsigned long timeout; |
502 | char name [15]; | |
1da177e4 | 503 | fe_status_t s; |
36cb557a | 504 | struct dvb_frontend_parameters *params; |
1da177e4 LT |
505 | |
506 | dprintk("%s\n", __FUNCTION__); | |
507 | ||
508 | snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num); | |
509 | ||
afd1a0c9 MCC |
510 | lock_kernel(); |
511 | daemonize(name); | |
512 | sigfillset(¤t->blocked); | |
513 | unlock_kernel(); | |
1da177e4 | 514 | |
36cb557a AQ |
515 | fepriv->check_wrapped = 0; |
516 | fepriv->quality = 0; | |
517 | fepriv->delay = 3*HZ; | |
1da177e4 | 518 | fepriv->status = 0; |
1da177e4 | 519 | fepriv->wakeup = 0; |
86f40cc3 | 520 | fepriv->reinitialise = 1; |
1da177e4 LT |
521 | |
522 | while (1) { | |
523 | up(&fepriv->sem); /* is locked when we enter the thread... */ | |
524 | ||
525 | timeout = wait_event_interruptible_timeout(fepriv->wait_queue, | |
526 | dvb_frontend_should_wakeup(fe), | |
36cb557a | 527 | fepriv->delay); |
1da177e4 LT |
528 | if (0 != dvb_frontend_is_exiting(fe)) { |
529 | /* got signal or quitting */ | |
530 | break; | |
531 | } | |
532 | ||
3e1d1d28 | 533 | try_to_freeze(); |
1da177e4 LT |
534 | |
535 | if (down_interruptible(&fepriv->sem)) | |
536 | break; | |
537 | ||
86f40cc3 AQ |
538 | if (fepriv->reinitialise) { |
539 | dvb_frontend_init(fe); | |
540 | fepriv->reinitialise = 0; | |
541 | } | |
542 | ||
36cb557a AQ |
543 | /* do an iteration of the tuning loop */ |
544 | if (fe->ops->tune) { | |
545 | /* have we been asked to retune? */ | |
546 | params = NULL; | |
547 | if (fepriv->state & FESTATE_RETUNE) { | |
548 | params = &fepriv->parameters; | |
549 | fepriv->state = FESTATE_TUNED; | |
550 | } | |
1da177e4 | 551 | |
36cb557a | 552 | fe->ops->tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s); |
1da177e4 LT |
553 | if (s != fepriv->status) { |
554 | dvb_frontend_add_event(fe, s); | |
555 | fepriv->status = s; | |
556 | } | |
36cb557a AQ |
557 | } else { |
558 | dvb_frontend_swzigzag(fe); | |
1da177e4 LT |
559 | } |
560 | } | |
561 | ||
562 | if (dvb_shutdown_timeout) { | |
563 | if (dvb_powerdown_on_sleep) | |
564 | if (fe->ops->set_voltage) | |
565 | fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF); | |
566 | if (fe->ops->sleep) | |
567 | fe->ops->sleep(fe); | |
568 | } | |
569 | ||
570 | fepriv->thread_pid = 0; | |
571 | mb(); | |
572 | ||
573 | dvb_frontend_wakeup(fe); | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static void dvb_frontend_stop(struct dvb_frontend *fe) | |
578 | { | |
579 | unsigned long ret; | |
0c53c70f | 580 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
581 | |
582 | dprintk ("%s\n", __FUNCTION__); | |
583 | ||
584 | fepriv->exit = 1; | |
585 | mb(); | |
586 | ||
587 | if (!fepriv->thread_pid) | |
588 | return; | |
589 | ||
590 | /* check if the thread is really alive */ | |
591 | if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) { | |
592 | printk("dvb_frontend_stop: thread PID %d already died\n", | |
593 | fepriv->thread_pid); | |
594 | /* make sure the mutex was not held by the thread */ | |
595 | init_MUTEX (&fepriv->sem); | |
596 | return; | |
597 | } | |
598 | ||
599 | /* wake up the frontend thread, so it notices that fe->exit == 1 */ | |
600 | dvb_frontend_wakeup(fe); | |
601 | ||
602 | /* wait until the frontend thread has exited */ | |
603 | ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid); | |
604 | if (-ERESTARTSYS != ret) { | |
605 | fepriv->state = FESTATE_IDLE; | |
606 | return; | |
607 | } | |
608 | fepriv->state = FESTATE_IDLE; | |
609 | ||
610 | /* paranoia check in case a signal arrived */ | |
611 | if (fepriv->thread_pid) | |
612 | printk("dvb_frontend_stop: warning: thread PID %d won't exit\n", | |
613 | fepriv->thread_pid); | |
614 | } | |
615 | ||
83b75b04 N |
616 | s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) |
617 | { | |
618 | return ((curtime.tv_usec < lasttime.tv_usec) ? | |
619 | 1000000 - lasttime.tv_usec + curtime.tv_usec : | |
620 | curtime.tv_usec - lasttime.tv_usec); | |
621 | } | |
622 | EXPORT_SYMBOL(timeval_usec_diff); | |
623 | ||
624 | static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) | |
625 | { | |
626 | curtime->tv_usec += add_usec; | |
627 | if (curtime->tv_usec >= 1000000) { | |
628 | curtime->tv_usec -= 1000000; | |
629 | curtime->tv_sec++; | |
630 | } | |
631 | } | |
632 | ||
633 | /* | |
634 | * Sleep until gettimeofday() > waketime + add_usec | |
635 | * This needs to be as precise as possible, but as the delay is | |
636 | * usually between 2ms and 32ms, it is done using a scheduled msleep | |
637 | * followed by usleep (normally a busy-wait loop) for the remainder | |
638 | */ | |
639 | void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) | |
640 | { | |
641 | struct timeval lasttime; | |
642 | s32 delta, newdelta; | |
643 | ||
644 | timeval_usec_add(waketime, add_usec); | |
645 | ||
646 | do_gettimeofday(&lasttime); | |
647 | delta = timeval_usec_diff(lasttime, *waketime); | |
648 | if (delta > 2500) { | |
649 | msleep((delta - 1500) / 1000); | |
650 | do_gettimeofday(&lasttime); | |
651 | newdelta = timeval_usec_diff(lasttime, *waketime); | |
652 | delta = (newdelta > delta) ? 0 : newdelta; | |
653 | } | |
654 | if (delta > 0) | |
655 | udelay(delta); | |
656 | } | |
657 | EXPORT_SYMBOL(dvb_frontend_sleep_until); | |
658 | ||
1da177e4 LT |
659 | static int dvb_frontend_start(struct dvb_frontend *fe) |
660 | { | |
661 | int ret; | |
0c53c70f | 662 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
663 | |
664 | dprintk ("%s\n", __FUNCTION__); | |
665 | ||
666 | if (fepriv->thread_pid) { | |
667 | if (!fepriv->exit) | |
668 | return 0; | |
669 | else | |
670 | dvb_frontend_stop (fe); | |
671 | } | |
672 | ||
673 | if (signal_pending(current)) | |
674 | return -EINTR; | |
675 | if (down_interruptible (&fepriv->sem)) | |
676 | return -EINTR; | |
677 | ||
678 | fepriv->state = FESTATE_IDLE; | |
679 | fepriv->exit = 0; | |
680 | fepriv->thread_pid = 0; | |
681 | mb(); | |
682 | ||
683 | ret = kernel_thread (dvb_frontend_thread, fe, 0); | |
684 | ||
685 | if (ret < 0) { | |
686 | printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret); | |
687 | up(&fepriv->sem); | |
688 | return ret; | |
689 | } | |
690 | fepriv->thread_pid = ret; | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static int dvb_frontend_ioctl(struct inode *inode, struct file *file, | |
696 | unsigned int cmd, void *parg) | |
697 | { | |
698 | struct dvb_device *dvbdev = file->private_data; | |
699 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 700 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
701 | int err = -EOPNOTSUPP; |
702 | ||
703 | dprintk ("%s\n", __FUNCTION__); | |
704 | ||
705 | if (!fe || fepriv->exit) | |
706 | return -ENODEV; | |
707 | ||
708 | if ((file->f_flags & O_ACCMODE) == O_RDONLY && | |
709 | (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT || | |
710 | cmd == FE_DISEQC_RECV_SLAVE_REPLY)) | |
711 | return -EPERM; | |
712 | ||
713 | if (down_interruptible (&fepriv->sem)) | |
714 | return -ERESTARTSYS; | |
715 | ||
716 | switch (cmd) { | |
717 | case FE_GET_INFO: { | |
0c53c70f | 718 | struct dvb_frontend_info* info = parg; |
1da177e4 LT |
719 | memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info)); |
720 | ||
721 | /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't | |
722 | * do it, it is done for it. */ | |
723 | info->caps |= FE_CAN_INVERSION_AUTO; | |
724 | err = 0; | |
725 | break; | |
726 | } | |
727 | ||
6757ccc5 PB |
728 | case FE_READ_STATUS: { |
729 | fe_status_t* status = parg; | |
730 | ||
731 | /* if retune was requested but hasn't occured yet, prevent | |
732 | * that user get signal state from previous tuning */ | |
733 | if(fepriv->state == FESTATE_RETUNE) { | |
734 | err=0; | |
735 | *status = 0; | |
736 | break; | |
737 | } | |
738 | ||
1da177e4 | 739 | if (fe->ops->read_status) |
6757ccc5 | 740 | err = fe->ops->read_status(fe, status); |
1da177e4 | 741 | break; |
6757ccc5 | 742 | } |
1da177e4 LT |
743 | case FE_READ_BER: |
744 | if (fe->ops->read_ber) | |
745 | err = fe->ops->read_ber(fe, (__u32*) parg); | |
746 | break; | |
747 | ||
748 | case FE_READ_SIGNAL_STRENGTH: | |
749 | if (fe->ops->read_signal_strength) | |
750 | err = fe->ops->read_signal_strength(fe, (__u16*) parg); | |
751 | break; | |
752 | ||
753 | case FE_READ_SNR: | |
754 | if (fe->ops->read_snr) | |
755 | err = fe->ops->read_snr(fe, (__u16*) parg); | |
756 | break; | |
757 | ||
758 | case FE_READ_UNCORRECTED_BLOCKS: | |
759 | if (fe->ops->read_ucblocks) | |
760 | err = fe->ops->read_ucblocks(fe, (__u32*) parg); | |
761 | break; | |
762 | ||
763 | ||
764 | case FE_DISEQC_RESET_OVERLOAD: | |
765 | if (fe->ops->diseqc_reset_overload) { | |
766 | err = fe->ops->diseqc_reset_overload(fe); | |
767 | fepriv->state = FESTATE_DISEQC; | |
768 | fepriv->status = 0; | |
769 | } | |
770 | break; | |
771 | ||
772 | case FE_DISEQC_SEND_MASTER_CMD: | |
773 | if (fe->ops->diseqc_send_master_cmd) { | |
774 | err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg); | |
775 | fepriv->state = FESTATE_DISEQC; | |
776 | fepriv->status = 0; | |
777 | } | |
778 | break; | |
779 | ||
780 | case FE_DISEQC_SEND_BURST: | |
781 | if (fe->ops->diseqc_send_burst) { | |
782 | err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg); | |
783 | fepriv->state = FESTATE_DISEQC; | |
784 | fepriv->status = 0; | |
785 | } | |
786 | break; | |
787 | ||
788 | case FE_SET_TONE: | |
789 | if (fe->ops->set_tone) { | |
790 | err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg); | |
791 | fepriv->state = FESTATE_DISEQC; | |
792 | fepriv->status = 0; | |
793 | } | |
794 | break; | |
795 | ||
796 | case FE_SET_VOLTAGE: | |
797 | if (fe->ops->set_voltage) { | |
798 | err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg); | |
799 | fepriv->state = FESTATE_DISEQC; | |
800 | fepriv->status = 0; | |
801 | } | |
802 | break; | |
803 | ||
804 | case FE_DISHNETWORK_SEND_LEGACY_CMD: | |
805 | if (fe->ops->dishnetwork_send_legacy_command) { | |
e18828e4 | 806 | err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned long) parg); |
1da177e4 LT |
807 | fepriv->state = FESTATE_DISEQC; |
808 | fepriv->status = 0; | |
83b75b04 N |
809 | } else if (fe->ops->set_voltage) { |
810 | /* | |
811 | * NOTE: This is a fallback condition. Some frontends | |
812 | * (stv0299 for instance) take longer than 8msec to | |
813 | * respond to a set_voltage command. Those switches | |
814 | * need custom routines to switch properly. For all | |
815 | * other frontends, the following shoule work ok. | |
816 | * Dish network legacy switches (as used by Dish500) | |
817 | * are controlled by sending 9-bit command words | |
818 | * spaced 8msec apart. | |
819 | * the actual command word is switch/port dependant | |
820 | * so it is up to the userspace application to send | |
821 | * the right command. | |
822 | * The command must always start with a '0' after | |
823 | * initialization, so parg is 8 bits and does not | |
824 | * include the initialization or start bit | |
825 | */ | |
400b7083 | 826 | unsigned long cmd = ((unsigned long) parg) << 1; |
83b75b04 N |
827 | struct timeval nexttime; |
828 | struct timeval tv[10]; | |
829 | int i; | |
830 | u8 last = 1; | |
831 | if (dvb_frontend_debug) | |
400b7083 | 832 | printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd); |
83b75b04 N |
833 | do_gettimeofday(&nexttime); |
834 | if (dvb_frontend_debug) | |
835 | memcpy(&tv[0], &nexttime, sizeof(struct timeval)); | |
836 | /* before sending a command, initialize by sending | |
837 | * a 32ms 18V to the switch | |
838 | */ | |
839 | fe->ops->set_voltage(fe, SEC_VOLTAGE_18); | |
840 | dvb_frontend_sleep_until(&nexttime, 32000); | |
841 | ||
842 | for (i = 0; i < 9; i++) { | |
843 | if (dvb_frontend_debug) | |
844 | do_gettimeofday(&tv[i + 1]); | |
845 | if ((cmd & 0x01) != last) { | |
846 | /* set voltage to (last ? 13V : 18V) */ | |
847 | fe->ops->set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); | |
848 | last = (last) ? 0 : 1; | |
849 | } | |
850 | cmd = cmd >> 1; | |
851 | if (i != 8) | |
852 | dvb_frontend_sleep_until(&nexttime, 8000); | |
853 | } | |
854 | if (dvb_frontend_debug) { | |
855 | printk("%s(%d): switch delay (should be 32k followed by all 8k\n", | |
856 | __FUNCTION__, fe->dvb->num); | |
857 | for (i = 1; i < 10; i++) | |
858 | printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); | |
859 | } | |
860 | err = 0; | |
861 | fepriv->state = FESTATE_DISEQC; | |
862 | fepriv->status = 0; | |
1da177e4 LT |
863 | } |
864 | break; | |
865 | ||
866 | case FE_DISEQC_RECV_SLAVE_REPLY: | |
867 | if (fe->ops->diseqc_recv_slave_reply) | |
868 | err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg); | |
869 | break; | |
870 | ||
871 | case FE_ENABLE_HIGH_LNB_VOLTAGE: | |
872 | if (fe->ops->enable_high_lnb_voltage) | |
e18828e4 | 873 | err = fe->ops->enable_high_lnb_voltage(fe, (long) parg); |
1da177e4 LT |
874 | break; |
875 | ||
876 | case FE_SET_FRONTEND: { | |
877 | struct dvb_frontend_tune_settings fetunesettings; | |
878 | ||
879 | memcpy (&fepriv->parameters, parg, | |
880 | sizeof (struct dvb_frontend_parameters)); | |
881 | ||
882 | memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings)); | |
883 | memcpy(&fetunesettings.parameters, parg, | |
884 | sizeof (struct dvb_frontend_parameters)); | |
885 | ||
886 | /* force auto frequency inversion if requested */ | |
887 | if (dvb_force_auto_inversion) { | |
888 | fepriv->parameters.inversion = INVERSION_AUTO; | |
889 | fetunesettings.parameters.inversion = INVERSION_AUTO; | |
890 | } | |
891 | if (fe->ops->info.type == FE_OFDM) { | |
892 | /* without hierachical coding code_rate_LP is irrelevant, | |
893 | * so we tolerate the otherwise invalid FEC_NONE setting */ | |
894 | if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE && | |
895 | fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE) | |
896 | fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO; | |
897 | } | |
898 | ||
899 | /* get frontend-specific tuning settings */ | |
900 | if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) { | |
901 | fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; | |
902 | fepriv->max_drift = fetunesettings.max_drift; | |
903 | fepriv->step_size = fetunesettings.step_size; | |
904 | } else { | |
905 | /* default values */ | |
906 | switch(fe->ops->info.type) { | |
907 | case FE_QPSK: | |
908 | fepriv->min_delay = HZ/20; | |
909 | fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000; | |
910 | fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000; | |
911 | break; | |
912 | ||
913 | case FE_QAM: | |
914 | fepriv->min_delay = HZ/20; | |
915 | fepriv->step_size = 0; /* no zigzag */ | |
916 | fepriv->max_drift = 0; | |
917 | break; | |
918 | ||
919 | case FE_OFDM: | |
920 | fepriv->min_delay = HZ/20; | |
921 | fepriv->step_size = fe->ops->info.frequency_stepsize * 2; | |
922 | fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1; | |
923 | break; | |
924 | case FE_ATSC: | |
925 | printk("dvb-core: FE_ATSC not handled yet.\n"); | |
926 | break; | |
927 | } | |
928 | } | |
929 | if (dvb_override_tune_delay > 0) | |
930 | fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; | |
931 | ||
932 | fepriv->state = FESTATE_RETUNE; | |
933 | dvb_frontend_wakeup(fe); | |
934 | dvb_frontend_add_event(fe, 0); | |
935 | fepriv->status = 0; | |
936 | err = 0; | |
937 | break; | |
938 | } | |
939 | ||
940 | case FE_GET_EVENT: | |
941 | err = dvb_frontend_get_event (fe, parg, file->f_flags); | |
942 | break; | |
943 | ||
944 | case FE_GET_FRONTEND: | |
945 | if (fe->ops->get_frontend) { | |
946 | memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters)); | |
947 | err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg); | |
948 | } | |
949 | break; | |
36cb557a AQ |
950 | |
951 | case FE_SET_FRONTEND_TUNE_MODE: | |
e18828e4 | 952 | fepriv->tune_mode_flags = (unsigned long) parg; |
36cb557a | 953 | break; |
1da177e4 LT |
954 | }; |
955 | ||
956 | up (&fepriv->sem); | |
957 | return err; | |
958 | } | |
959 | ||
960 | static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) | |
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 | |
966 | dprintk ("%s\n", __FUNCTION__); | |
967 | ||
968 | poll_wait (file, &fepriv->events.wait_queue, wait); | |
969 | ||
970 | if (fepriv->events.eventw != fepriv->events.eventr) | |
971 | return (POLLIN | POLLRDNORM | POLLPRI); | |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
976 | static int dvb_frontend_open(struct inode *inode, struct file *file) | |
977 | { | |
978 | struct dvb_device *dvbdev = file->private_data; | |
979 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 980 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
981 | int ret; |
982 | ||
983 | dprintk ("%s\n", __FUNCTION__); | |
984 | ||
985 | if ((ret = dvb_generic_open (inode, file)) < 0) | |
986 | return ret; | |
987 | ||
988 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) { | |
989 | ret = dvb_frontend_start (fe); | |
990 | if (ret) | |
991 | dvb_generic_release (inode, file); | |
992 | ||
993 | /* empty event queue */ | |
994 | fepriv->events.eventr = fepriv->events.eventw = 0; | |
36cb557a AQ |
995 | |
996 | /* normal tune mode when opened R/W */ | |
997 | fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT; | |
1da177e4 LT |
998 | } |
999 | ||
1000 | return ret; | |
1001 | } | |
1002 | ||
1003 | static int dvb_frontend_release(struct inode *inode, struct file *file) | |
1004 | { | |
1005 | struct dvb_device *dvbdev = file->private_data; | |
1006 | struct dvb_frontend *fe = dvbdev->priv; | |
0c53c70f | 1007 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
1008 | |
1009 | dprintk ("%s\n", __FUNCTION__); | |
1010 | ||
1011 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) | |
1012 | fepriv->release_jiffies = jiffies; | |
1013 | ||
1014 | return dvb_generic_release (inode, file); | |
1015 | } | |
1016 | ||
1017 | static struct file_operations dvb_frontend_fops = { | |
1018 | .owner = THIS_MODULE, | |
1019 | .ioctl = dvb_generic_ioctl, | |
1020 | .poll = dvb_frontend_poll, | |
1021 | .open = dvb_frontend_open, | |
1022 | .release = dvb_frontend_release | |
1023 | }; | |
1024 | ||
1025 | int dvb_register_frontend(struct dvb_adapter* dvb, | |
1026 | struct dvb_frontend* fe) | |
1027 | { | |
1028 | struct dvb_frontend_private *fepriv; | |
1029 | static const struct dvb_device dvbdev_template = { | |
1030 | .users = ~0, | |
1031 | .writers = 1, | |
1032 | .readers = (~0)-1, | |
1033 | .fops = &dvb_frontend_fops, | |
1034 | .kernel_ioctl = dvb_frontend_ioctl | |
1035 | }; | |
1036 | ||
1037 | dprintk ("%s\n", __FUNCTION__); | |
1038 | ||
3593cab5 | 1039 | if (mutex_lock_interruptible(&frontend_mutex)) |
1da177e4 LT |
1040 | return -ERESTARTSYS; |
1041 | ||
7408187d | 1042 | fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); |
1da177e4 | 1043 | if (fe->frontend_priv == NULL) { |
3593cab5 | 1044 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1045 | return -ENOMEM; |
1046 | } | |
0c53c70f | 1047 | fepriv = fe->frontend_priv; |
1da177e4 LT |
1048 | |
1049 | init_MUTEX (&fepriv->sem); | |
1050 | init_waitqueue_head (&fepriv->wait_queue); | |
1051 | init_waitqueue_head (&fepriv->events.wait_queue); | |
1052 | init_MUTEX (&fepriv->events.sem); | |
1053 | fe->dvb = dvb; | |
1054 | fepriv->inversion = INVERSION_OFF; | |
1055 | ||
1056 | printk ("DVB: registering frontend %i (%s)...\n", | |
1057 | fe->dvb->num, | |
1058 | fe->ops->info.name); | |
1059 | ||
1060 | dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template, | |
1061 | fe, DVB_DEVICE_FRONTEND); | |
1062 | ||
3593cab5 | 1063 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1064 | return 0; |
1065 | } | |
1066 | EXPORT_SYMBOL(dvb_register_frontend); | |
1067 | ||
1068 | int dvb_unregister_frontend(struct dvb_frontend* fe) | |
1069 | { | |
0c53c70f | 1070 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
1da177e4 LT |
1071 | dprintk ("%s\n", __FUNCTION__); |
1072 | ||
3593cab5 | 1073 | mutex_lock(&frontend_mutex); |
1da177e4 LT |
1074 | dvb_unregister_device (fepriv->dvbdev); |
1075 | dvb_frontend_stop (fe); | |
1076 | if (fe->ops->release) | |
1077 | fe->ops->release(fe); | |
1078 | else | |
1079 | printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name); | |
1080 | /* fe is invalid now */ | |
1081 | kfree(fepriv); | |
3593cab5 | 1082 | mutex_unlock(&frontend_mutex); |
1da177e4 LT |
1083 | return 0; |
1084 | } | |
1085 | EXPORT_SYMBOL(dvb_unregister_frontend); |