2 * dvb-core.c: DVB core driver
4 * Copyright (C) 1999-2001 Ralph Metzler
7 * for convergence integrated media GmbH
9 * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
27 #include <linux/string.h>
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/wait.h>
31 #include <linux/slab.h>
32 #include <linux/poll.h>
33 #include <linux/module.h>
34 #include <linux/list.h>
35 #include <asm/processor.h>
36 #include <asm/semaphore.h>
38 #include "dvb_frontend.h"
40 #include "dvb_functions.h"
42 #define FESTATE_IDLE 1
43 #define FESTATE_RETUNE 2
44 #define FESTATE_TUNING_FAST 4
45 #define FESTATE_TUNING_SLOW 8
46 #define FESTATE_TUNED 16
47 #define FESTATE_ZIGZAG_FAST 32
48 #define FESTATE_ZIGZAG_SLOW 64
49 #define FESTATE_DISEQC 128
50 #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
51 #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
52 #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
53 #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
55 * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
56 * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
57 * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
58 * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
59 * FESTATE_TUNED. The frontend has successfully locked on.
60 * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
61 * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
62 * FESTATE_DISEQC. A DISEQC command has just been issued.
63 * FESTATE_WAITFORLOCK. When we're waiting for a lock.
64 * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
65 * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
66 * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
70 static int dvb_frontend_debug = 0;
71 static int dvb_shutdown_timeout = 5;
72 static int dvb_override_frequency_bending = 0;
73 static int dvb_force_auto_inversion = 0;
74 static int dvb_override_tune_delay = 0;
76 static int do_frequency_bending = 0;
78 #define dprintk if (dvb_frontend_debug) printk
82 struct dvb_fe_events {
83 struct dvb_frontend_event events[MAX_EVENT];
87 wait_queue_head_t wait_queue;
92 struct dvb_frontend_data {
93 struct dvb_frontend_info *info;
94 struct dvb_frontend frontend;
95 struct dvb_device *dvbdev;
96 struct dvb_frontend_parameters parameters;
97 struct dvb_fe_events events;
99 struct list_head list_head;
100 wait_queue_head_t wait_queue;
102 unsigned long release_jiffies;
109 int started_auto_step;
119 struct dvb_frontend_ioctl_data {
120 struct list_head list_head;
121 struct dvb_adapter *adapter;
122 int (*before_ioctl) (struct dvb_frontend *frontend,
123 unsigned int cmd, void *arg);
124 int (*after_ioctl) (struct dvb_frontend *frontend,
125 unsigned int cmd, void *arg);
126 void *before_after_data;
130 struct dvb_frontend_notifier_data {
131 struct list_head list_head;
132 struct dvb_adapter *adapter;
133 void (*callback) (fe_status_t s, void *data);
138 static LIST_HEAD(frontend_list);
139 static LIST_HEAD(frontend_ioctl_list);
140 static LIST_HEAD(frontend_notifier_list);
142 static DECLARE_MUTEX(frontend_mutex);
145 static int dvb_frontend_internal_ioctl (struct dvb_frontend *frontend,
146 unsigned int cmd, void *arg)
148 int err = -EOPNOTSUPP;
150 dprintk ("%s\n", __FUNCTION__);
152 if (frontend->before_ioctl)
153 err = frontend->before_ioctl (frontend, cmd, arg);
155 if (err == -EOPNOTSUPP) {
156 err = frontend->ioctl (frontend, cmd, arg);
158 if ((err == -EOPNOTSUPP) && frontend->after_ioctl)
159 err = frontend->after_ioctl (frontend, cmd, arg);
167 * if 2 tuners are located side by side you can get interferences when
168 * they try to tune to the same frequency, so both lose sync.
169 * We will slightly mistune in this case. The AFC of the demodulator
170 * should make it still possible to receive the requested transponder
173 static void dvb_bend_frequency (struct dvb_frontend_data *this_fe, int recursive)
175 struct list_head *entry;
176 int stepsize = this_fe->info->frequency_stepsize;
177 int this_fe_adap_num = this_fe->frontend.i2c->adapter->num;
180 if (!stepsize || recursive > 10) {
181 printk ("%s: too deep recursion, check frequency_stepsize "
182 "in your frontend code!\n", __FUNCTION__);
186 dprintk ("%s\n", __FUNCTION__);
189 if (down_interruptible (&frontend_mutex))
192 this_fe->bending = 0;
195 list_for_each (entry, &frontend_list) {
196 struct dvb_frontend_data *fe;
199 fe = list_entry (entry, struct dvb_frontend_data, list_head);
201 if (fe->frontend.i2c->adapter->num != this_fe_adap_num)
204 f = fe->parameters.frequency;
208 frequency = this_fe->parameters.frequency;
209 frequency += this_fe->lnb_drift;
210 frequency += this_fe->bending;
212 if (this_fe != fe && (fe->state != FESTATE_IDLE) &&
213 frequency > f - stepsize && frequency < f + stepsize)
216 this_fe->bending += stepsize;
218 this_fe->bending = -this_fe->bending;
220 dvb_bend_frequency (this_fe, recursive + 1);
226 up (&frontend_mutex);
230 static void dvb_call_frontend_notifiers (struct dvb_frontend_data *fe,
233 dprintk ("%s\n", __FUNCTION__);
235 if (((s ^ fe->status) & FE_HAS_LOCK) && (s & FE_HAS_LOCK))
236 dvb_delay (fe->info->notifier_delay);
240 if (!(s & FE_HAS_LOCK) && (fe->info->caps & FE_CAN_MUTE_TS))
244 * now tell the Demux about the TS status changes...
246 if (fe->frontend.notifier_callback)
247 fe->frontend.notifier_callback(fe->status, fe->frontend.notifier_data);
251 static void dvb_frontend_add_event (struct dvb_frontend_data *fe, fe_status_t status)
253 struct dvb_fe_events *events = &fe->events;
254 struct dvb_frontend_event *e;
257 dprintk ("%s\n", __FUNCTION__);
259 if (down_interruptible (&events->sem))
262 wp = (events->eventw + 1) % MAX_EVENT;
264 if (wp == events->eventr) {
265 events->overflow = 1;
266 events->eventr = (events->eventr + 1) % MAX_EVENT;
269 e = &events->events[events->eventw];
271 memcpy (&e->parameters, &fe->parameters,
272 sizeof (struct dvb_frontend_parameters));
274 if (status & FE_HAS_LOCK)
275 dvb_frontend_internal_ioctl (&fe->frontend,
283 dvb_call_frontend_notifiers (fe, status);
285 wake_up_interruptible (&events->wait_queue);
289 static int dvb_frontend_get_event (struct dvb_frontend_data *fe,
290 struct dvb_frontend_event *event, int flags)
292 struct dvb_fe_events *events = &fe->events;
294 dprintk ("%s\n", __FUNCTION__);
296 if (events->overflow) {
297 events->overflow = 0;
301 if (events->eventw == events->eventr) {
304 if (flags & O_NONBLOCK)
309 ret = wait_event_interruptible (events->wait_queue,
310 events->eventw != events->eventr);
312 if (down_interruptible (&fe->sem))
319 if (down_interruptible (&events->sem))
322 memcpy (event, &events->events[events->eventr],
323 sizeof(struct dvb_frontend_event));
325 events->eventr = (events->eventr + 1) % MAX_EVENT;
332 static void dvb_frontend_init (struct dvb_frontend_data *fe)
334 struct dvb_frontend *frontend = &fe->frontend;
336 dprintk ("DVB: initialising frontend %i:%i (%s)...\n",
337 frontend->i2c->adapter->num, frontend->i2c->id,
340 dvb_frontend_internal_ioctl (frontend, FE_INIT, NULL);
343 static void update_delay (int *quality, int *delay, int min_delay, int locked)
347 dprintk ("%s\n", __FUNCTION__);
350 (*quality) = (*quality * 220 + 36*256) / 256;
352 (*quality) = (*quality * 220 + 0) / 256;
357 *delay = min_delay + q2 * HZ / (128*128);
361 * Performs automatic twiddling of frontend parameters.
363 * @param fe The frontend concerned.
364 * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
365 * @returns Number of complete iterations that have been performed.
367 static int dvb_frontend_autotune(struct dvb_frontend_data *fe, int check_wrapped)
371 int original_inversion = fe->parameters.inversion;
372 u32 original_frequency = fe->parameters.frequency;
374 // are we using autoinversion?
375 autoinversion = ((!(fe->info->caps & FE_CAN_INVERSION_AUTO)) && (fe->parameters.inversion == INVERSION_AUTO));
377 // setup parameters correctly
379 // calculate the lnb_drift
380 fe->lnb_drift = fe->auto_step * fe->step_size;
382 // wrap the auto_step if we've exceeded the maximum drift
383 if (fe->lnb_drift > fe->max_drift) {
385 fe->auto_sub_step = 0;
389 // perform inversion and +/- zigzag
390 switch(fe->auto_sub_step) {
392 // try with the current inversion and current drift setting
397 if (!autoinversion) break;
399 fe->inversion = (fe->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
404 if (fe->lnb_drift == 0) break;
406 fe->lnb_drift = -fe->lnb_drift;
411 if (fe->lnb_drift == 0) break;
412 if (!autoinversion) break;
414 fe->inversion = (fe->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
415 fe->lnb_drift = -fe->lnb_drift;
421 fe->auto_sub_step = -1; // it'll be incremented to 0 in a moment
425 if (!ready) fe->auto_sub_step++;
428 // if this attempt would hit where we started, indicate a complete iteration has occurred
429 if ((fe->auto_step == fe->started_auto_step) && (fe->auto_sub_step == 0) && check_wrapped) {
433 // perform frequency bending if necessary
434 if ((dvb_override_frequency_bending != 1) && do_frequency_bending)
435 dvb_bend_frequency(fe, 0);
438 dprintk("%s: drift:%i bending:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
439 __FUNCTION__, fe->lnb_drift, fe->bending, fe->inversion, fe->auto_step, fe->auto_sub_step,
440 fe->started_auto_step);
442 // set the frontend itself
443 fe->parameters.frequency += fe->lnb_drift + fe->bending;
444 if (autoinversion) fe->parameters.inversion = fe->inversion;
445 dvb_frontend_internal_ioctl (&fe->frontend, FE_SET_FRONTEND, &fe->parameters);
446 fe->parameters.frequency = original_frequency;
447 fe->parameters.inversion = original_inversion;
456 static int dvb_frontend_is_exiting (struct dvb_frontend_data *fe)
461 if (fe->dvbdev->writers == 1)
462 if (jiffies - fe->release_jiffies > dvb_shutdown_timeout * HZ)
468 static int dvb_frontend_should_wakeup (struct dvb_frontend_data *fe)
474 return dvb_frontend_is_exiting(fe);
477 static void dvb_frontend_wakeup (struct dvb_frontend_data *fe) {
479 wake_up_interruptible(&fe->wait_queue);
482 static int dvb_frontend_thread (void *data)
484 struct dvb_frontend_data *fe = (struct dvb_frontend_data *) data;
485 unsigned long timeout;
487 int quality = 0, delay = 3*HZ;
489 int check_wrapped = 0;
491 dprintk ("%s\n", __FUNCTION__);
493 snprintf (name, sizeof(name), "kdvb-fe-%i:%i",
494 fe->frontend.i2c->adapter->num, fe->frontend.i2c->id);
496 dvb_kernel_thread_setup (name);
498 dvb_call_frontend_notifiers (fe, 0);
499 dvb_frontend_init (fe);
503 up (&fe->sem); /* is locked when we enter the thread... */
505 timeout = wait_event_interruptible_timeout(fe->wait_queue,0 != dvb_frontend_should_wakeup (fe), delay);
506 if (-ERESTARTSYS == timeout || 0 != dvb_frontend_is_exiting (fe)) {
507 /* got signal or quitting */
511 if (down_interruptible (&fe->sem))
514 // if we've got no parameters, just keep idling
515 if (fe->state & FESTATE_IDLE) {
521 // get the frontend status
522 dvb_frontend_internal_ioctl (&fe->frontend, FE_READ_STATUS, &s);
524 dvb_frontend_add_event (fe, s);
526 // if we're not tuned, and we have a lock, move to the TUNED state
527 if ((fe->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
528 update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
529 fe->state = FESTATE_TUNED;
531 // if we're tuned, then we have determined the correct inversion
532 if ((!(fe->info->caps & FE_CAN_INVERSION_AUTO)) && (fe->parameters.inversion == INVERSION_AUTO)) {
533 fe->parameters.inversion = fe->inversion;
538 // if we are tuned already, check we're still locked
539 if (fe->state & FESTATE_TUNED) {
540 update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
542 // we're tuned, and the lock is still good...
543 if (s & FE_HAS_LOCK) {
546 // if we _WERE_ tuned, but now don't have a lock, need to zigzag
547 fe->state = FESTATE_ZIGZAG_FAST;
548 fe->started_auto_step = fe->auto_step;
554 // don't actually do anything if we're in the LOSTLOCK state, the frontend is set to
555 // FE_CAN_RECOVER, and the max_drift is 0
556 if ((fe->state & FESTATE_LOSTLOCK) &&
557 (fe->info->caps & FE_CAN_RECOVER) && (fe->max_drift == 0)) {
558 update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
562 // don't do anything if we're in the DISEQC state, since this might be someone
563 // with a motorized dish controlled by DISEQC. If its actually a re-tune, there will
564 // be a SET_FRONTEND soon enough.
565 if (fe->state & FESTATE_DISEQC) {
566 update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
570 // if we're in the RETUNE state, set everything up for a brand new scan,
571 // keeping the current inversion setting, as the next tune is _very_ likely
572 // to require the same
573 if (fe->state & FESTATE_RETUNE) {
576 fe->auto_sub_step = 0;
577 fe->started_auto_step = 0;
582 if ((fe->state & FESTATE_SEARCHING_FAST) || (fe->state & FESTATE_RETUNE)) {
583 delay = fe->min_delay;
586 if (dvb_frontend_autotune(fe, check_wrapped)) {
587 // OK, if we've run out of trials at the fast speed. Drop back to
588 // slow for the _next_ attempt
589 fe->state = FESTATE_SEARCHING_SLOW;
590 fe->started_auto_step = fe->auto_step;
595 // if we've just retuned, enter the ZIGZAG_FAST state. This ensures
596 // we cannot return from an FE_SET_FRONTEND ioctl before the first frontend
598 if (fe->state & FESTATE_RETUNE) {
599 fe->state = FESTATE_TUNING_FAST;
600 wake_up_interruptible(&fe->wait_queue);
605 if (fe->state & FESTATE_SEARCHING_SLOW) {
606 update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
608 // Note: don't bother checking for wrapping; we stay in this state
609 // until we get a lock
610 dvb_frontend_autotune(fe, 0);
614 if (dvb_shutdown_timeout)
615 dvb_frontend_internal_ioctl (&fe->frontend, FE_SLEEP, NULL);
622 dvb_frontend_wakeup(fe);
627 static void dvb_frontend_stop (struct dvb_frontend_data *fe)
631 dprintk ("%s\n", __FUNCTION__);
639 /* check if the thread is really alive */
640 if (kill_proc(fe->thread_pid, 0, 1) == -ESRCH) {
641 printk("dvb_frontend_stop: thread PID %d already died\n",
643 /* make sure the mutex was not held by the thread */
644 init_MUTEX (&fe->sem);
648 /* wake up the frontend thread, so it notices that fe->exit == 1 */
649 dvb_frontend_wakeup(fe);
651 /* wait until the frontend thread has exited */
652 ret = wait_event_interruptible(fe->wait_queue,0 == fe->thread_pid);
653 if (-ERESTARTSYS != ret) {
654 fe->state = FESTATE_IDLE;
657 fe->state = FESTATE_IDLE;
659 /* paranoia check in case a signal arrived */
661 printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
666 static int dvb_frontend_start (struct dvb_frontend_data *fe)
670 dprintk ("%s\n", __FUNCTION__);
672 if (fe->thread_pid) {
676 dvb_frontend_stop (fe);
679 if (signal_pending(current))
681 if (down_interruptible (&fe->sem))
684 fe->state = FESTATE_IDLE;
689 ret = kernel_thread (dvb_frontend_thread, fe, 0);
691 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
695 fe->thread_pid = ret;
701 static int dvb_frontend_ioctl (struct inode *inode, struct file *file,
702 unsigned int cmd, void *parg)
704 struct dvb_device *dvbdev = file->private_data;
705 struct dvb_frontend_data *fe = dvbdev->priv;
706 struct dvb_frontend_tune_settings fetunesettings;
709 dprintk ("%s\n", __FUNCTION__);
711 if (!fe || !fe->frontend.ioctl || fe->exit)
714 if (down_interruptible (&fe->sem))
718 case FE_DISEQC_SEND_MASTER_CMD:
719 case FE_DISEQC_SEND_BURST:
722 dvb_call_frontend_notifiers (fe, 0);
723 dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
724 fe->state = FESTATE_DISEQC;
727 case FE_SET_FRONTEND:
728 fe->state = FESTATE_RETUNE;
730 memcpy (&fe->parameters, parg,
731 sizeof (struct dvb_frontend_parameters));
733 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
734 memcpy(&fetunesettings.parameters, parg,
735 sizeof (struct dvb_frontend_parameters));
737 // force auto frequency inversion if requested
738 if (dvb_force_auto_inversion) {
739 fe->parameters.inversion = INVERSION_AUTO;
740 fetunesettings.parameters.inversion = INVERSION_AUTO;
743 // get frontend-specific tuning settings
744 if (dvb_frontend_internal_ioctl(&fe->frontend, FE_GET_TUNE_SETTINGS, &fetunesettings) == 0) {
745 fe->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
746 fe->max_drift = fetunesettings.max_drift;
747 fe->step_size = fetunesettings.step_size;
750 switch(fe->info->type) {
752 fe->min_delay = HZ/20; // default mindelay of 50ms
753 fe->step_size = fe->parameters.u.qpsk.symbol_rate / 16000;
754 fe->max_drift = fe->parameters.u.qpsk.symbol_rate / 2000;
758 fe->min_delay = HZ/20; // default mindelay of 50ms
760 fe->max_drift = 0; // don't want any zigzagging under DVB-C frontends
764 fe->min_delay = HZ/20; // default mindelay of 50ms
765 fe->step_size = fe->info->frequency_stepsize * 2;
766 fe->max_drift = (fe->info->frequency_stepsize * 2) + 1;
770 if (dvb_override_tune_delay > 0) {
771 fe->min_delay = (dvb_override_tune_delay * HZ) / 1000;
774 dvb_frontend_add_event (fe, 0);
778 err = dvb_frontend_get_event (fe, parg, file->f_flags);
780 case FE_GET_FRONTEND:
781 memcpy (parg, &fe->parameters,
782 sizeof (struct dvb_frontend_parameters));
783 /* fall-through... */
785 err = dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
792 // Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't do it, it is done for it.
793 if ((cmd == FE_GET_INFO) && (err == 0)) {
794 struct dvb_frontend_info* tmp = (struct dvb_frontend_info*) parg;
795 tmp->caps |= FE_CAN_INVERSION_AUTO;
798 // if the frontend has just been set, wait until the first tune has finished.
799 // This ensures the app doesn't start reading data too quickly, perhaps from the
800 // previous lock, which is REALLY CONFUSING TO DEBUG!
801 if ((cmd == FE_SET_FRONTEND) && (err == 0)) {
802 dvb_frontend_wakeup(fe);
803 err = wait_event_interruptible(fe->wait_queue, fe->state & ~FESTATE_RETUNE);
810 static unsigned int dvb_frontend_poll (struct file *file, struct poll_table_struct *wait)
812 struct dvb_device *dvbdev = file->private_data;
813 struct dvb_frontend_data *fe = dvbdev->priv;
815 dprintk ("%s\n", __FUNCTION__);
817 poll_wait (file, &fe->events.wait_queue, wait);
819 if (fe->events.eventw != fe->events.eventr)
820 return (POLLIN | POLLRDNORM | POLLPRI);
826 static int dvb_frontend_open (struct inode *inode, struct file *file)
828 struct dvb_device *dvbdev = file->private_data;
829 struct dvb_frontend_data *fe = dvbdev->priv;
832 dprintk ("%s\n", __FUNCTION__);
834 if ((ret = dvb_generic_open (inode, file)) < 0)
837 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
838 ret = dvb_frontend_start (fe);
840 dvb_generic_release (inode, file);
842 /* empty event queue */
843 fe->events.eventr = fe->events.eventw = 0;
850 static int dvb_frontend_release (struct inode *inode, struct file *file)
852 struct dvb_device *dvbdev = file->private_data;
853 struct dvb_frontend_data *fe = dvbdev->priv;
855 dprintk ("%s\n", __FUNCTION__);
857 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
858 fe->release_jiffies = jiffies;
860 return dvb_generic_release (inode, file);
866 dvb_add_frontend_ioctls (struct dvb_adapter *adapter,
867 int (*before_ioctl) (struct dvb_frontend *frontend,
868 unsigned int cmd, void *arg),
869 int (*after_ioctl) (struct dvb_frontend *frontend,
870 unsigned int cmd, void *arg),
871 void *before_after_data)
873 struct dvb_frontend_ioctl_data *ioctl;
874 struct list_head *entry;
876 dprintk ("%s\n", __FUNCTION__);
878 if (down_interruptible (&frontend_mutex))
881 ioctl = kmalloc (sizeof(struct dvb_frontend_ioctl_data), GFP_KERNEL);
884 up (&frontend_mutex);
888 ioctl->adapter = adapter;
889 ioctl->before_ioctl = before_ioctl;
890 ioctl->after_ioctl = after_ioctl;
891 ioctl->before_after_data = before_after_data;
893 list_add_tail (&ioctl->list_head, &frontend_ioctl_list);
895 list_for_each (entry, &frontend_list) {
896 struct dvb_frontend_data *fe;
898 fe = list_entry (entry, struct dvb_frontend_data, list_head);
900 if (fe->frontend.i2c->adapter == adapter &&
901 fe->frontend.before_ioctl == NULL &&
902 fe->frontend.after_ioctl == NULL)
904 fe->frontend.before_ioctl = before_ioctl;
905 fe->frontend.after_ioctl = after_ioctl;
906 fe->frontend.before_after_data = before_after_data;
910 up (&frontend_mutex);
917 dvb_remove_frontend_ioctls (struct dvb_adapter *adapter,
918 int (*before_ioctl) (struct dvb_frontend *frontend,
919 unsigned int cmd, void *arg),
920 int (*after_ioctl) (struct dvb_frontend *frontend,
921 unsigned int cmd, void *arg))
923 struct list_head *entry, *n;
925 dprintk ("%s\n", __FUNCTION__);
927 down (&frontend_mutex);
929 list_for_each (entry, &frontend_list) {
930 struct dvb_frontend_data *fe;
932 fe = list_entry (entry, struct dvb_frontend_data, list_head);
934 if (fe->frontend.i2c->adapter == adapter &&
935 fe->frontend.before_ioctl == before_ioctl &&
936 fe->frontend.after_ioctl == after_ioctl)
938 fe->frontend.before_ioctl = NULL;
939 fe->frontend.after_ioctl = NULL;
944 list_for_each_safe (entry, n, &frontend_ioctl_list) {
945 struct dvb_frontend_ioctl_data *ioctl;
947 ioctl = list_entry (entry, struct dvb_frontend_ioctl_data, list_head);
949 if (ioctl->adapter == adapter &&
950 ioctl->before_ioctl == before_ioctl &&
951 ioctl->after_ioctl == after_ioctl)
953 list_del (&ioctl->list_head);
960 up (&frontend_mutex);
965 dvb_add_frontend_notifier (struct dvb_adapter *adapter,
966 void (*callback) (fe_status_t s, void *data),
969 struct dvb_frontend_notifier_data *notifier;
970 struct list_head *entry;
972 dprintk ("%s\n", __FUNCTION__);
974 if (down_interruptible (&frontend_mutex))
977 notifier = kmalloc (sizeof(struct dvb_frontend_notifier_data), GFP_KERNEL);
980 up (&frontend_mutex);
984 notifier->adapter = adapter;
985 notifier->callback = callback;
986 notifier->data = data;
988 list_add_tail (¬ifier->list_head, &frontend_notifier_list);
990 list_for_each (entry, &frontend_list) {
991 struct dvb_frontend_data *fe;
993 fe = list_entry (entry, struct dvb_frontend_data, list_head);
995 if (fe->frontend.i2c->adapter == adapter &&
996 fe->frontend.notifier_callback == NULL)
998 fe->frontend.notifier_callback = callback;
999 fe->frontend.notifier_data = data;
1003 up (&frontend_mutex);
1010 dvb_remove_frontend_notifier (struct dvb_adapter *adapter,
1011 void (*callback) (fe_status_t s, void *data))
1013 struct list_head *entry, *n;
1015 dprintk ("%s\n", __FUNCTION__);
1017 down (&frontend_mutex);
1019 list_for_each (entry, &frontend_list) {
1020 struct dvb_frontend_data *fe;
1022 fe = list_entry (entry, struct dvb_frontend_data, list_head);
1024 if (fe->frontend.i2c->adapter == adapter &&
1025 fe->frontend.notifier_callback == callback)
1027 fe->frontend.notifier_callback = NULL;
1032 list_for_each_safe (entry, n, &frontend_notifier_list) {
1033 struct dvb_frontend_notifier_data *notifier;
1035 notifier = list_entry (entry, struct dvb_frontend_notifier_data, list_head);
1037 if (notifier->adapter == adapter &&
1038 notifier->callback == callback)
1040 list_del (¬ifier->list_head);
1047 up (&frontend_mutex);
1051 static struct file_operations dvb_frontend_fops = {
1052 .owner = THIS_MODULE,
1053 .ioctl = dvb_generic_ioctl,
1054 .poll = dvb_frontend_poll,
1055 .open = dvb_frontend_open,
1056 .release = dvb_frontend_release
1062 dvb_register_frontend (int (*ioctl) (struct dvb_frontend *frontend,
1063 unsigned int cmd, void *arg),
1064 struct dvb_i2c_bus *i2c,
1066 struct dvb_frontend_info *info)
1068 struct list_head *entry;
1069 struct dvb_frontend_data *fe;
1070 static const struct dvb_device dvbdev_template = {
1074 .fops = &dvb_frontend_fops,
1075 .kernel_ioctl = dvb_frontend_ioctl
1078 dprintk ("%s\n", __FUNCTION__);
1080 if (down_interruptible (&frontend_mutex))
1081 return -ERESTARTSYS;
1083 if (!(fe = kmalloc (sizeof (struct dvb_frontend_data), GFP_KERNEL))) {
1084 up (&frontend_mutex);
1088 memset (fe, 0, sizeof (struct dvb_frontend_data));
1090 init_MUTEX (&fe->sem);
1091 init_waitqueue_head (&fe->wait_queue);
1092 init_waitqueue_head (&fe->events.wait_queue);
1093 init_MUTEX (&fe->events.sem);
1094 fe->events.eventw = fe->events.eventr = 0;
1095 fe->events.overflow = 0;
1097 fe->frontend.ioctl = ioctl;
1098 fe->frontend.i2c = i2c;
1099 fe->frontend.data = data;
1101 fe->inversion = INVERSION_OFF;
1103 list_for_each (entry, &frontend_ioctl_list) {
1104 struct dvb_frontend_ioctl_data *ioctl;
1106 ioctl = list_entry (entry,
1107 struct dvb_frontend_ioctl_data,
1110 if (ioctl->adapter == i2c->adapter) {
1111 fe->frontend.before_ioctl = ioctl->before_ioctl;
1112 fe->frontend.after_ioctl = ioctl->after_ioctl;
1113 fe->frontend.before_after_data = ioctl->before_after_data;
1118 list_for_each (entry, &frontend_notifier_list) {
1119 struct dvb_frontend_notifier_data *notifier;
1121 notifier = list_entry (entry,
1122 struct dvb_frontend_notifier_data,
1125 if (notifier->adapter == i2c->adapter) {
1126 fe->frontend.notifier_callback = notifier->callback;
1127 fe->frontend.notifier_data = notifier->data;
1132 list_add_tail (&fe->list_head, &frontend_list);
1134 printk ("DVB: registering frontend %i:%i (%s)...\n",
1135 fe->frontend.i2c->adapter->num, fe->frontend.i2c->id,
1138 dvb_register_device (i2c->adapter, &fe->dvbdev, &dvbdev_template,
1139 fe, DVB_DEVICE_FRONTEND);
1141 if ((info->caps & FE_NEEDS_BENDING) || (dvb_override_frequency_bending == 2))
1142 do_frequency_bending = 1;
1144 up (&frontend_mutex);
1150 int dvb_unregister_frontend (int (*ioctl) (struct dvb_frontend *frontend,
1151 unsigned int cmd, void *arg),
1152 struct dvb_i2c_bus *i2c)
1154 struct list_head *entry, *n;
1156 dprintk ("%s\n", __FUNCTION__);
1158 down (&frontend_mutex);
1160 list_for_each_safe (entry, n, &frontend_list) {
1161 struct dvb_frontend_data *fe;
1163 fe = list_entry (entry, struct dvb_frontend_data, list_head);
1165 if (fe->frontend.ioctl == ioctl && fe->frontend.i2c == i2c) {
1166 dvb_unregister_device (fe->dvbdev);
1168 up (&frontend_mutex);
1169 dvb_frontend_stop (fe);
1175 up (&frontend_mutex);
1179 MODULE_PARM(dvb_frontend_debug,"i");
1180 MODULE_PARM(dvb_shutdown_timeout,"i");
1181 MODULE_PARM(dvb_override_frequency_bending,"i");
1182 MODULE_PARM(dvb_force_auto_inversion,"i");
1183 MODULE_PARM(dvb_override_tune_delay,"i");
1185 MODULE_PARM_DESC(dvb_frontend_debug, "enable verbose debug messages");
1186 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
1187 MODULE_PARM_DESC(dvb_override_frequency_bending, "0: normal (default), 1: never use frequency bending, 2: always use frequency bending");
1188 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
1189 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");