2 * dvb_frontend.c: DVB frontend tuning interface/thread
5 * Copyright (C) 1999-2001 Ralph Metzler
8 * for convergence integrated media GmbH
10 * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
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.
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.
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
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>
38 #include <linux/jiffies.h>
39 #include <asm/processor.h>
41 #include "dvb_frontend.h"
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;
50 module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
51 MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
52 module_param(dvb_shutdown_timeout, int, 0644);
53 MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
54 module_param(dvb_force_auto_inversion, int, 0644);
55 MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
56 module_param(dvb_override_tune_delay, int, 0644);
57 MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
58 module_param(dvb_powerdown_on_sleep, int, 0644);
59 MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)");
61 #define dprintk if (dvb_frontend_debug) printk
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)
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.
90 static DEFINE_MUTEX(frontend_mutex);
92 struct dvb_frontend_private {
94 /* thread/frontend values */
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;
106 unsigned long tune_mode_flags;
109 /* swzigzag values */
111 unsigned int bending;
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;
121 unsigned int check_wrapped;
125 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
127 struct dvb_frontend_private *fepriv = fe->frontend_priv;
128 struct dvb_fe_events *events = &fepriv->events;
129 struct dvb_frontend_event *e;
132 dprintk ("%s\n", __FUNCTION__);
134 if (down_interruptible (&events->sem))
137 wp = (events->eventw + 1) % MAX_EVENT;
139 if (wp == events->eventr) {
140 events->overflow = 1;
141 events->eventr = (events->eventr + 1) % MAX_EVENT;
144 e = &events->events[events->eventw];
146 memcpy (&e->parameters, &fepriv->parameters,
147 sizeof (struct dvb_frontend_parameters));
149 if (status & FE_HAS_LOCK)
150 if (fe->ops->get_frontend)
151 fe->ops->get_frontend(fe, &e->parameters);
159 wake_up_interruptible (&events->wait_queue);
162 static int dvb_frontend_get_event(struct dvb_frontend *fe,
163 struct dvb_frontend_event *event, int flags)
165 struct dvb_frontend_private *fepriv = fe->frontend_priv;
166 struct dvb_fe_events *events = &fepriv->events;
168 dprintk ("%s\n", __FUNCTION__);
170 if (events->overflow) {
171 events->overflow = 0;
175 if (events->eventw == events->eventr) {
178 if (flags & O_NONBLOCK)
183 ret = wait_event_interruptible (events->wait_queue,
184 events->eventw != events->eventr);
186 if (down_interruptible (&fepriv->sem))
193 if (down_interruptible (&events->sem))
196 memcpy (event, &events->events[events->eventr],
197 sizeof(struct dvb_frontend_event));
199 events->eventr = (events->eventr + 1) % MAX_EVENT;
206 static void dvb_frontend_init(struct dvb_frontend *fe)
208 dprintk ("DVB: initialising frontend %i (%s)...\n",
216 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
220 dprintk ("%s\n", __FUNCTION__);
223 (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256;
225 (fepriv->quality) = (fepriv->quality * 220 + 0) / 256;
227 q2 = fepriv->quality - 128;
230 fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128);
234 * Performs automatic twiddling of frontend parameters.
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.
240 static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped)
244 struct dvb_frontend_private *fepriv = fe->frontend_priv;
245 int original_inversion = fepriv->parameters.inversion;
246 u32 original_frequency = fepriv->parameters.frequency;
248 /* are we using autoinversion? */
249 autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) &&
250 (fepriv->parameters.inversion == INVERSION_AUTO));
252 /* setup parameters correctly */
254 /* calculate the lnb_drift */
255 fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size;
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;
264 /* perform inversion and +/- zigzag */
265 switch(fepriv->auto_sub_step) {
267 /* try with the current inversion and current drift setting */
272 if (!autoinversion) break;
274 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
279 if (fepriv->lnb_drift == 0) break;
281 fepriv->lnb_drift = -fepriv->lnb_drift;
286 if (fepriv->lnb_drift == 0) break;
287 if (!autoinversion) break;
289 fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
290 fepriv->lnb_drift = -fepriv->lnb_drift;
296 fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
300 if (!ready) fepriv->auto_sub_step++;
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) {
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);
315 /* set the frontend itself */
316 fepriv->parameters.frequency += fepriv->lnb_drift;
318 fepriv->parameters.inversion = fepriv->inversion;
319 if (fe->ops->set_frontend)
320 fe->ops->set_frontend(fe, &fepriv->parameters);
322 fepriv->parameters.frequency = original_frequency;
323 fepriv->parameters.inversion = original_inversion;
325 fepriv->auto_sub_step++;
329 static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
332 struct dvb_frontend_private *fepriv = fe->frontend_priv;
334 /* if we've got no parameters, just keep idling */
335 if (fepriv->state & FESTATE_IDLE) {
336 fepriv->delay = 3*HZ;
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;
348 fepriv->delay = 3*HZ;
353 /* get the frontend status */
354 if (fepriv->state & FESTATE_RETUNE) {
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);
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;
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;
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);
382 /* we're tuned, and the lock is still good... */
383 if (s & FE_HAS_LOCK) {
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;
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);
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);
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;
420 if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) {
421 fepriv->delay = fepriv->min_delay;
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;
431 fepriv->check_wrapped = 1;
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
437 if (fepriv->state & FESTATE_RETUNE) {
438 fepriv->state = FESTATE_TUNING_FAST;
443 if (fepriv->state & FESTATE_SEARCHING_SLOW) {
444 dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK);
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);
452 static int dvb_frontend_is_exiting(struct dvb_frontend *fe)
454 struct dvb_frontend_private *fepriv = fe->frontend_priv;
459 if (fepriv->dvbdev->writers == 1)
460 if (time_after(jiffies, fepriv->release_jiffies +
461 dvb_shutdown_timeout * HZ))
467 static int dvb_frontend_should_wakeup(struct dvb_frontend *fe)
469 struct dvb_frontend_private *fepriv = fe->frontend_priv;
471 if (fepriv->wakeup) {
475 return dvb_frontend_is_exiting(fe);
478 static void dvb_frontend_wakeup(struct dvb_frontend *fe)
480 struct dvb_frontend_private *fepriv = fe->frontend_priv;
483 wake_up_interruptible(&fepriv->wait_queue);
486 static int dvb_frontend_thread(void *data)
488 struct dvb_frontend *fe = data;
489 struct dvb_frontend_private *fepriv = fe->frontend_priv;
490 unsigned long timeout;
493 struct dvb_frontend_parameters *params;
495 dprintk("%s\n", __FUNCTION__);
497 snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num);
501 sigfillset(¤t->blocked);
504 fepriv->check_wrapped = 0;
506 fepriv->delay = 3*HZ;
508 dvb_frontend_init(fe);
512 up(&fepriv->sem); /* is locked when we enter the thread... */
514 timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
515 dvb_frontend_should_wakeup(fe),
517 if (0 != dvb_frontend_is_exiting(fe)) {
518 /* got signal or quitting */
524 if (down_interruptible(&fepriv->sem))
527 /* do an iteration of the tuning loop */
529 /* have we been asked to retune? */
531 if (fepriv->state & FESTATE_RETUNE) {
532 params = &fepriv->parameters;
533 fepriv->state = FESTATE_TUNED;
536 fe->ops->tune(fe, params, fepriv->tune_mode_flags, &fepriv->delay, &s);
537 if (s != fepriv->status) {
538 dvb_frontend_add_event(fe, s);
542 dvb_frontend_swzigzag(fe);
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);
554 fepriv->thread_pid = 0;
557 dvb_frontend_wakeup(fe);
561 static void dvb_frontend_stop(struct dvb_frontend *fe)
564 struct dvb_frontend_private *fepriv = fe->frontend_priv;
566 dprintk ("%s\n", __FUNCTION__);
571 if (!fepriv->thread_pid)
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",
578 /* make sure the mutex was not held by the thread */
579 init_MUTEX (&fepriv->sem);
583 /* wake up the frontend thread, so it notices that fe->exit == 1 */
584 dvb_frontend_wakeup(fe);
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;
592 fepriv->state = FESTATE_IDLE;
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",
600 s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
602 return ((curtime.tv_usec < lasttime.tv_usec) ?
603 1000000 - lasttime.tv_usec + curtime.tv_usec :
604 curtime.tv_usec - lasttime.tv_usec);
606 EXPORT_SYMBOL(timeval_usec_diff);
608 static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
610 curtime->tv_usec += add_usec;
611 if (curtime->tv_usec >= 1000000) {
612 curtime->tv_usec -= 1000000;
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
623 void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
625 struct timeval lasttime;
628 timeval_usec_add(waketime, add_usec);
630 do_gettimeofday(&lasttime);
631 delta = timeval_usec_diff(lasttime, *waketime);
633 msleep((delta - 1500) / 1000);
634 do_gettimeofday(&lasttime);
635 newdelta = timeval_usec_diff(lasttime, *waketime);
636 delta = (newdelta > delta) ? 0 : newdelta;
641 EXPORT_SYMBOL(dvb_frontend_sleep_until);
643 static int dvb_frontend_start(struct dvb_frontend *fe)
646 struct dvb_frontend_private *fepriv = fe->frontend_priv;
648 dprintk ("%s\n", __FUNCTION__);
650 if (fepriv->thread_pid) {
654 dvb_frontend_stop (fe);
657 if (signal_pending(current))
659 if (down_interruptible (&fepriv->sem))
662 fepriv->state = FESTATE_IDLE;
664 fepriv->thread_pid = 0;
667 ret = kernel_thread (dvb_frontend_thread, fe, 0);
670 printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
674 fepriv->thread_pid = ret;
679 static int dvb_frontend_ioctl(struct inode *inode, struct file *file,
680 unsigned int cmd, void *parg)
682 struct dvb_device *dvbdev = file->private_data;
683 struct dvb_frontend *fe = dvbdev->priv;
684 struct dvb_frontend_private *fepriv = fe->frontend_priv;
685 int err = -EOPNOTSUPP;
687 dprintk ("%s\n", __FUNCTION__);
689 if (!fe || fepriv->exit)
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))
697 if (down_interruptible (&fepriv->sem))
702 struct dvb_frontend_info* info = parg;
703 memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info));
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;
712 case FE_READ_STATUS: {
713 fe_status_t* status = parg;
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) {
723 if (fe->ops->read_status)
724 err = fe->ops->read_status(fe, status);
728 if (fe->ops->read_ber)
729 err = fe->ops->read_ber(fe, (__u32*) parg);
732 case FE_READ_SIGNAL_STRENGTH:
733 if (fe->ops->read_signal_strength)
734 err = fe->ops->read_signal_strength(fe, (__u16*) parg);
738 if (fe->ops->read_snr)
739 err = fe->ops->read_snr(fe, (__u16*) parg);
742 case FE_READ_UNCORRECTED_BLOCKS:
743 if (fe->ops->read_ucblocks)
744 err = fe->ops->read_ucblocks(fe, (__u32*) parg);
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;
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;
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;
773 if (fe->ops->set_tone) {
774 err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg);
775 fepriv->state = FESTATE_DISEQC;
781 if (fe->ops->set_voltage) {
782 err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg);
783 fepriv->state = FESTATE_DISEQC;
788 case FE_DISHNETWORK_SEND_LEGACY_CMD:
789 if (fe->ops->dishnetwork_send_legacy_command) {
790 err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned long) parg);
791 fepriv->state = FESTATE_DISEQC;
793 } else if (fe->ops->set_voltage) {
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
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
810 unsigned long cmd = ((unsigned long) parg) << 1;
811 struct timeval nexttime;
812 struct timeval tv[10];
815 if (dvb_frontend_debug)
816 printk("%s switch command: 0x%04lx\n", __FUNCTION__, cmd);
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
823 fe->ops->set_voltage(fe, SEC_VOLTAGE_18);
824 dvb_frontend_sleep_until(&nexttime, 32000);
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;
836 dvb_frontend_sleep_until(&nexttime, 8000);
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]));
845 fepriv->state = FESTATE_DISEQC;
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);
855 case FE_ENABLE_HIGH_LNB_VOLTAGE:
856 if (fe->ops->enable_high_lnb_voltage)
857 err = fe->ops->enable_high_lnb_voltage(fe, (long) parg);
860 case FE_SET_FRONTEND: {
861 struct dvb_frontend_tune_settings fetunesettings;
863 memcpy (&fepriv->parameters, parg,
864 sizeof (struct dvb_frontend_parameters));
866 memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
867 memcpy(&fetunesettings.parameters, parg,
868 sizeof (struct dvb_frontend_parameters));
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;
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;
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;
890 switch(fe->ops->info.type) {
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;
898 fepriv->min_delay = HZ/20;
899 fepriv->step_size = 0; /* no zigzag */
900 fepriv->max_drift = 0;
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;
909 printk("dvb-core: FE_ATSC not handled yet.\n");
913 if (dvb_override_tune_delay > 0)
914 fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000;
916 fepriv->state = FESTATE_RETUNE;
917 dvb_frontend_wakeup(fe);
918 dvb_frontend_add_event(fe, 0);
925 err = dvb_frontend_get_event (fe, parg, file->f_flags);
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);
935 case FE_SET_FRONTEND_TUNE_MODE:
936 fepriv->tune_mode_flags = (unsigned long) parg;
944 static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait)
946 struct dvb_device *dvbdev = file->private_data;
947 struct dvb_frontend *fe = dvbdev->priv;
948 struct dvb_frontend_private *fepriv = fe->frontend_priv;
950 dprintk ("%s\n", __FUNCTION__);
952 poll_wait (file, &fepriv->events.wait_queue, wait);
954 if (fepriv->events.eventw != fepriv->events.eventr)
955 return (POLLIN | POLLRDNORM | POLLPRI);
960 static int dvb_frontend_open(struct inode *inode, struct file *file)
962 struct dvb_device *dvbdev = file->private_data;
963 struct dvb_frontend *fe = dvbdev->priv;
964 struct dvb_frontend_private *fepriv = fe->frontend_priv;
967 dprintk ("%s\n", __FUNCTION__);
969 if ((ret = dvb_generic_open (inode, file)) < 0)
972 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
973 ret = dvb_frontend_start (fe);
975 dvb_generic_release (inode, file);
977 /* empty event queue */
978 fepriv->events.eventr = fepriv->events.eventw = 0;
980 /* normal tune mode when opened R/W */
981 fepriv->tune_mode_flags &= ~FE_TUNE_MODE_ONESHOT;
987 static int dvb_frontend_release(struct inode *inode, struct file *file)
989 struct dvb_device *dvbdev = file->private_data;
990 struct dvb_frontend *fe = dvbdev->priv;
991 struct dvb_frontend_private *fepriv = fe->frontend_priv;
993 dprintk ("%s\n", __FUNCTION__);
995 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
996 fepriv->release_jiffies = jiffies;
998 return dvb_generic_release (inode, file);
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
1009 int dvb_register_frontend(struct dvb_adapter* dvb,
1010 struct dvb_frontend* fe)
1012 struct dvb_frontend_private *fepriv;
1013 static const struct dvb_device dvbdev_template = {
1017 .fops = &dvb_frontend_fops,
1018 .kernel_ioctl = dvb_frontend_ioctl
1021 dprintk ("%s\n", __FUNCTION__);
1023 if (mutex_lock_interruptible(&frontend_mutex))
1024 return -ERESTARTSYS;
1026 fe->frontend_priv = kzalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL);
1027 if (fe->frontend_priv == NULL) {
1028 mutex_unlock(&frontend_mutex);
1031 fepriv = fe->frontend_priv;
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);
1038 fepriv->inversion = INVERSION_OFF;
1040 printk ("DVB: registering frontend %i (%s)...\n",
1042 fe->ops->info.name);
1044 dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template,
1045 fe, DVB_DEVICE_FRONTEND);
1047 mutex_unlock(&frontend_mutex);
1050 EXPORT_SYMBOL(dvb_register_frontend);
1052 int dvb_unregister_frontend(struct dvb_frontend* fe)
1054 struct dvb_frontend_private *fepriv = fe->frontend_priv;
1055 dprintk ("%s\n", __FUNCTION__);
1057 mutex_lock(&frontend_mutex);
1058 dvb_unregister_device (fepriv->dvbdev);
1059 dvb_frontend_stop (fe);
1060 if (fe->ops->release)
1061 fe->ops->release(fe);
1063 printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name);
1064 /* fe is invalid now */
1066 mutex_unlock(&frontend_mutex);
1069 EXPORT_SYMBOL(dvb_unregister_frontend);