/*
* dvb-core.c: DVB core driver
*
* Copyright (C) 1999-2001 Ralph Metzler
* Marcus Metzler
* Holger Waechtler
* for convergence integrated media GmbH
*
* Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/list.h>
#include <asm/processor.h>
#include <asm/semaphore.h>
#include "dvb_frontend.h"
#include "dvbdev.h"
#include "dvb_functions.h"
#define FESTATE_IDLE 1
#define FESTATE_RETUNE 2
#define FESTATE_TUNING_FAST 4
#define FESTATE_TUNING_SLOW 8
#define FESTATE_TUNED 16
#define FESTATE_ZIGZAG_FAST 32
#define FESTATE_ZIGZAG_SLOW 64
#define FESTATE_DISEQC 128
#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
#define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW)
/*
* FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling.
* FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune.
* FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress.
* FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower.
* FESTATE_TUNED. The frontend has successfully locked on.
* FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it.
* FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower.
* FESTATE_DISEQC. A DISEQC command has just been issued.
* FESTATE_WAITFORLOCK. When we're waiting for a lock.
* FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan.
* FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan.
* FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again.
*/
static int dvb_frontend_debug = 0;
static int dvb_shutdown_timeout = 5;
static int dvb_override_frequency_bending = 0;
static int dvb_force_auto_inversion = 0;
static int dvb_override_tune_delay = 0;
static int do_frequency_bending = 0;
#define dprintk if (dvb_frontend_debug) printk
#define MAX_EVENT 8
struct dvb_fe_events {
struct dvb_frontend_event events[MAX_EVENT];
int eventw;
int eventr;
int overflow;
wait_queue_head_t wait_queue;
struct semaphore sem;
};
struct dvb_frontend_data {
struct dvb_frontend_info *info;
struct dvb_frontend frontend;
struct dvb_device *dvbdev;
struct dvb_frontend_parameters parameters;
struct dvb_fe_events events;
struct semaphore sem;
struct list_head list_head;
wait_queue_head_t wait_queue;
pid_t thread_pid;
unsigned long release_jiffies;
int state;
int bending;
int lnb_drift;
int inversion;
int auto_step;
int auto_sub_step;
int started_auto_step;
int min_delay;
int max_drift;
int step_size;
int exit;
int wakeup;
fe_status_t status;
};
struct dvb_frontend_ioctl_data {
struct list_head list_head;
struct dvb_adapter *adapter;
int (*before_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg);
int (*after_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg);
void *before_after_data;
};
struct dvb_frontend_notifier_data {
struct list_head list_head;
struct dvb_adapter *adapter;
void (*callback) (fe_status_t s, void *data);
void *data;
};
static LIST_HEAD(frontend_list);
static LIST_HEAD(frontend_ioctl_list);
static LIST_HEAD(frontend_notifier_list);
static DECLARE_MUTEX(frontend_mutex);
static int dvb_frontend_internal_ioctl (struct dvb_frontend *frontend,
unsigned int cmd, void *arg)
{
int err = -EOPNOTSUPP;
dprintk ("%s\n", __FUNCTION__);
if (frontend->before_ioctl)
err = frontend->before_ioctl (frontend, cmd, arg);
if (err == -EOPNOTSUPP) {
err = frontend->ioctl (frontend, cmd, arg);
if ((err == -EOPNOTSUPP) && frontend->after_ioctl)
err = frontend->after_ioctl (frontend, cmd, arg);
}
return err;
}
/**
* if 2 tuners are located side by side you can get interferences when
* they try to tune to the same frequency, so both lose sync.
* We will slightly mistune in this case. The AFC of the demodulator
* should make it still possible to receive the requested transponder
* on both tuners...
*/
static void dvb_bend_frequency (struct dvb_frontend_data *this_fe, int recursive)
{
struct list_head *entry;
int stepsize = this_fe->info->frequency_stepsize;
int this_fe_adap_num = this_fe->frontend.i2c->adapter->num;
int frequency;
if (!stepsize || recursive > 10) {
printk ("%s: too deep recursion, check frequency_stepsize "
"in your frontend code!\n", __FUNCTION__);
return;
}
dprintk ("%s\n", __FUNCTION__);
if (!recursive) {
if (down_interruptible (&frontend_mutex))
return;
this_fe->bending = 0;
}
list_for_each (entry, &frontend_list) {
struct dvb_frontend_data *fe;
int f;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.i2c->adapter->num != this_fe_adap_num)
continue;
f = fe->parameters.frequency;
f += fe->lnb_drift;
f += fe->bending;
frequency = this_fe->parameters.frequency;
frequency += this_fe->lnb_drift;
frequency += this_fe->bending;
if (this_fe != fe && (fe->state != FESTATE_IDLE) &&
frequency > f - stepsize && frequency < f + stepsize)
{
if (recursive % 2)
this_fe->bending += stepsize;
else
this_fe->bending = -this_fe->bending;
dvb_bend_frequency (this_fe, recursive + 1);
goto done;
}
}
done:
if (!recursive)
up (&frontend_mutex);
}
static void dvb_call_frontend_notifiers (struct dvb_frontend_data *fe,
fe_status_t s)
{
dprintk ("%s\n", __FUNCTION__);
if (((s ^ fe->status) & FE_HAS_LOCK) && (s & FE_HAS_LOCK))
dvb_delay (fe->info->notifier_delay);
fe->status = s;
if (!(s & FE_HAS_LOCK) && (fe->info->caps & FE_CAN_MUTE_TS))
return;
/**
* now tell the Demux about the TS status changes...
*/
if (fe->frontend.notifier_callback)
fe->frontend.notifier_callback(fe->status, fe->frontend.notifier_data);
}
static void dvb_frontend_add_event (struct dvb_frontend_data *fe, fe_status_t status)
{
struct dvb_fe_events *events = &fe->events;
struct dvb_frontend_event *e;
int wp;
dprintk ("%s\n", __FUNCTION__);
if (down_interruptible (&events->sem))
return;
wp = (events->eventw + 1) % MAX_EVENT;
if (wp == events->eventr) {
events->overflow = 1;
events->eventr = (events->eventr + 1) % MAX_EVENT;
}
e = &events->events[events->eventw];
memcpy (&e->parameters, &fe->parameters,
sizeof (struct dvb_frontend_parameters));
if (status & FE_HAS_LOCK)
dvb_frontend_internal_ioctl (&fe->frontend,
FE_GET_FRONTEND,
&e->parameters);
events->eventw = wp;
up (&events->sem);
e->status = status;
dvb_call_frontend_notifiers (fe, status);
wake_up_interruptible (&events->wait_queue);
}
static int dvb_frontend_get_event (struct dvb_frontend_data *fe,
struct dvb_frontend_event *event, int flags)
{
struct dvb_fe_events *events = &fe->events;
dprintk ("%s\n", __FUNCTION__);
if (events->overflow) {
events->overflow = 0;
return -EOVERFLOW;
}
if (events->eventw == events->eventr) {
int ret;
if (flags & O_NONBLOCK)
return -EWOULDBLOCK;
up(&fe->sem);
ret = wait_event_interruptible (events->wait_queue,
events->eventw != events->eventr);
if (down_interruptible (&fe->sem))
return -ERESTARTSYS;
if (ret < 0)
return ret;
}
if (down_interruptible (&events->sem))
return -ERESTARTSYS;
memcpy (event, &events->events[events->eventr],
sizeof(struct dvb_frontend_event));
events->eventr = (events->eventr + 1) % MAX_EVENT;
up (&events->sem);
return 0;
}
static void dvb_frontend_init (struct dvb_frontend_data *fe)
{
struct dvb_frontend *frontend = &fe->frontend;
dprintk ("DVB: initialising frontend %i:%i (%s)...\n",
frontend->i2c->adapter->num, frontend->i2c->id,
fe->info->name);
dvb_frontend_internal_ioctl (frontend, FE_INIT, NULL);
}
static void update_delay (int *quality, int *delay, int min_delay, int locked)
{
int q2;
dprintk ("%s\n", __FUNCTION__);
if (locked)
(*quality) = (*quality * 220 + 36*256) / 256;
else
(*quality) = (*quality * 220 + 0) / 256;
q2 = *quality - 128;
q2 *= q2;
*delay = min_delay + q2 * HZ / (128*128);
}
/**
* Performs automatic twiddling of frontend parameters.
*
* @param fe The frontend concerned.
* @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT
* @returns Number of complete iterations that have been performed.
*/
static int dvb_frontend_autotune(struct dvb_frontend_data *fe, int check_wrapped)
{
int autoinversion;
int ready = 0;
int original_inversion = fe->parameters.inversion;
u32 original_frequency = fe->parameters.frequency;
// are we using autoinversion?
autoinversion = ((!(fe->info->caps & FE_CAN_INVERSION_AUTO)) && (fe->parameters.inversion == INVERSION_AUTO));
// setup parameters correctly
while(!ready) {
// calculate the lnb_drift
fe->lnb_drift = fe->auto_step * fe->step_size;
// wrap the auto_step if we've exceeded the maximum drift
if (fe->lnb_drift > fe->max_drift) {
fe->auto_step = 0;
fe->auto_sub_step = 0;
fe->lnb_drift = 0;
}
// perform inversion and +/- zigzag
switch(fe->auto_sub_step) {
case 0:
// try with the current inversion and current drift setting
ready = 1;
break;
case 1:
if (!autoinversion) break;
fe->inversion = (fe->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
ready = 1;
break;
case 2:
if (fe->lnb_drift == 0) break;
fe->lnb_drift = -fe->lnb_drift;
ready = 1;
break;
case 3:
if (fe->lnb_drift == 0) break;
if (!autoinversion) break;
fe->inversion = (fe->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF;
fe->lnb_drift = -fe->lnb_drift;
ready = 1;
break;
default:
fe->auto_step++;
fe->auto_sub_step = -1; // it'll be incremented to 0 in a moment
break;
}
if (!ready) fe->auto_sub_step++;
}
// if this attempt would hit where we started, indicate a complete iteration has occurred
if ((fe->auto_step == fe->started_auto_step) && (fe->auto_sub_step == 0) && check_wrapped) {
return 1;
}
// perform frequency bending if necessary
if ((dvb_override_frequency_bending != 1) && do_frequency_bending)
dvb_bend_frequency(fe, 0);
// instrumentation
dprintk("%s: drift:%i bending:%i inversion:%i auto_step:%i auto_sub_step:%i started_auto_step:%i\n",
__FUNCTION__, fe->lnb_drift, fe->bending, fe->inversion, fe->auto_step, fe->auto_sub_step,
fe->started_auto_step);
// set the frontend itself
fe->parameters.frequency += fe->lnb_drift + fe->bending;
if (autoinversion) fe->parameters.inversion = fe->inversion;
dvb_frontend_internal_ioctl (&fe->frontend, FE_SET_FRONTEND, &fe->parameters);
fe->parameters.frequency = original_frequency;
fe->parameters.inversion = original_inversion;
// normal return
fe->auto_sub_step++;
return 0;
}
static int dvb_frontend_is_exiting (struct dvb_frontend_data *fe)
{
if (fe->exit)
return 1;
if (fe->dvbdev->writers == 1)
if (jiffies - fe->release_jiffies > dvb_shutdown_timeout * HZ)
return 1;
return 0;
}
static int dvb_frontend_should_wakeup (struct dvb_frontend_data *fe)
{
if (fe->wakeup) {
fe->wakeup = 0;
return 1;
}
return dvb_frontend_is_exiting(fe);
}
static void dvb_frontend_wakeup (struct dvb_frontend_data *fe) {
fe->wakeup = 1;
wake_up_interruptible(&fe->wait_queue);
}
static int dvb_frontend_thread (void *data)
{
struct dvb_frontend_data *fe = (struct dvb_frontend_data *) data;
unsigned long timeout;
char name [15];
int quality = 0, delay = 3*HZ;
fe_status_t s;
int check_wrapped = 0;
dprintk ("%s\n", __FUNCTION__);
snprintf (name, sizeof(name), "kdvb-fe-%i:%i",
fe->frontend.i2c->adapter->num, fe->frontend.i2c->id);
dvb_kernel_thread_setup (name);
dvb_call_frontend_notifiers (fe, 0);
dvb_frontend_init (fe);
fe->wakeup = 0;
while (1) {
up (&fe->sem); /* is locked when we enter the thread... */
timeout = wait_event_interruptible_timeout(fe->wait_queue,0 != dvb_frontend_should_wakeup (fe), delay);
if (-ERESTARTSYS == timeout || 0 != dvb_frontend_is_exiting (fe)) {
/* got signal or quitting */
break;
}
if (down_interruptible (&fe->sem))
break;
// if we've got no parameters, just keep idling
if (fe->state & FESTATE_IDLE) {
delay = 3*HZ;
quality = 0;
continue;
}
// get the frontend status
dvb_frontend_internal_ioctl (&fe->frontend, FE_READ_STATUS, &s);
if (s != fe->status)
dvb_frontend_add_event (fe, s);
// if we're not tuned, and we have a lock, move to the TUNED state
if ((fe->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) {
update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
fe->state = FESTATE_TUNED;
// if we're tuned, then we have determined the correct inversion
if ((!(fe->info->caps & FE_CAN_INVERSION_AUTO)) && (fe->parameters.inversion == INVERSION_AUTO)) {
fe->parameters.inversion = fe->inversion;
}
continue;
}
// if we are tuned already, check we're still locked
if (fe->state & FESTATE_TUNED) {
update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
// we're tuned, and the lock is still good...
if (s & FE_HAS_LOCK) {
continue;
} else {
// if we _WERE_ tuned, but now don't have a lock, need to zigzag
fe->state = FESTATE_ZIGZAG_FAST;
fe->started_auto_step = fe->auto_step;
check_wrapped = 0;
// fallthrough
}
}
// don't actually do anything if we're in the LOSTLOCK state, the frontend is set to
// FE_CAN_RECOVER, and the max_drift is 0
if ((fe->state & FESTATE_LOSTLOCK) &&
(fe->info->caps & FE_CAN_RECOVER) && (fe->max_drift == 0)) {
update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
continue;
}
// don't do anything if we're in the DISEQC state, since this might be someone
// with a motorized dish controlled by DISEQC. If its actually a re-tune, there will
// be a SET_FRONTEND soon enough.
if (fe->state & FESTATE_DISEQC) {
update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
continue;
}
// if we're in the RETUNE state, set everything up for a brand new scan,
// keeping the current inversion setting, as the next tune is _very_ likely
// to require the same
if (fe->state & FESTATE_RETUNE) {
fe->lnb_drift = 0;
fe->auto_step = 0;
fe->auto_sub_step = 0;
fe->started_auto_step = 0;
check_wrapped = 0;
}
// fast zigzag.
if ((fe->state & FESTATE_SEARCHING_FAST) || (fe->state & FESTATE_RETUNE)) {
delay = fe->min_delay;
// peform a tune
if (dvb_frontend_autotune(fe, check_wrapped)) {
// OK, if we've run out of trials at the fast speed. Drop back to
// slow for the _next_ attempt
fe->state = FESTATE_SEARCHING_SLOW;
fe->started_auto_step = fe->auto_step;
continue;
}
check_wrapped = 1;
// if we've just retuned, enter the ZIGZAG_FAST state. This ensures
// we cannot return from an FE_SET_FRONTEND ioctl before the first frontend
// tune occurs
if (fe->state & FESTATE_RETUNE) {
fe->state = FESTATE_TUNING_FAST;
wake_up_interruptible(&fe->wait_queue);
}
}
// slow zigzag
if (fe->state & FESTATE_SEARCHING_SLOW) {
update_delay(&quality, &delay, fe->min_delay, s & FE_HAS_LOCK);
// Note: don't bother checking for wrapping; we stay in this state
// until we get a lock
dvb_frontend_autotune(fe, 0);
}
};
if (dvb_shutdown_timeout)
dvb_frontend_internal_ioctl (&fe->frontend, FE_SLEEP, NULL);
up (&fe->sem);
fe->thread_pid = 0;
mb();
dvb_frontend_wakeup(fe);
return 0;
}
static void dvb_frontend_stop (struct dvb_frontend_data *fe)
{
unsigned long ret;
dprintk ("%s\n", __FUNCTION__);
fe->exit = 1;
mb();
if (!fe->thread_pid)
return;
/* check if the thread is really alive */
if (kill_proc(fe->thread_pid, 0, 1) == -ESRCH) {
printk("dvb_frontend_stop: thread PID %d already died\n",
fe->thread_pid);
/* make sure the mutex was not held by the thread */
init_MUTEX (&fe->sem);
return;
}
/* wake up the frontend thread, so it notices that fe->exit == 1 */
dvb_frontend_wakeup(fe);
/* wait until the frontend thread has exited */
ret = wait_event_interruptible(fe->wait_queue,0 == fe->thread_pid);
if (-ERESTARTSYS != ret) {
fe->state = FESTATE_IDLE;
return;
}
fe->state = FESTATE_IDLE;
/* paranoia check in case a signal arrived */
if (fe->thread_pid)
printk("dvb_frontend_stop: warning: thread PID %d won't exit\n",
fe->thread_pid);
}
static int dvb_frontend_start (struct dvb_frontend_data *fe)
{
int ret;
dprintk ("%s\n", __FUNCTION__);
if (fe->thread_pid) {
if (!fe->exit)
return 0;
else
dvb_frontend_stop (fe);
}
if (signal_pending(current))
return -EINTR;
if (down_interruptible (&fe->sem))
return -EINTR;
fe->state = FESTATE_IDLE;
fe->exit = 0;
fe->thread_pid = 0;
mb();
ret = kernel_thread (dvb_frontend_thread, fe, 0);
if (ret < 0) {
printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret);
up(&fe->sem);
return ret;
}
fe->thread_pid = ret;
return 0;
}
static int dvb_frontend_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, void *parg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend_data *fe = dvbdev->priv;
struct dvb_frontend_tune_settings fetunesettings;
int err = 0;
dprintk ("%s\n", __FUNCTION__);
if (!fe || !fe->frontend.ioctl || fe->exit)
return -ENODEV;
if (down_interruptible (&fe->sem))
return -ERESTARTSYS;
switch (cmd) {
case FE_DISEQC_SEND_MASTER_CMD:
case FE_DISEQC_SEND_BURST:
case FE_SET_TONE:
if (fe->status)
dvb_call_frontend_notifiers (fe, 0);
dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
fe->state = FESTATE_DISEQC;
break;
case FE_SET_FRONTEND:
fe->state = FESTATE_RETUNE;
memcpy (&fe->parameters, parg,
sizeof (struct dvb_frontend_parameters));
memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings));
memcpy(&fetunesettings.parameters, parg,
sizeof (struct dvb_frontend_parameters));
// force auto frequency inversion if requested
if (dvb_force_auto_inversion) {
fe->parameters.inversion = INVERSION_AUTO;
fetunesettings.parameters.inversion = INVERSION_AUTO;
}
// get frontend-specific tuning settings
if (dvb_frontend_internal_ioctl(&fe->frontend, FE_GET_TUNE_SETTINGS, &fetunesettings) == 0) {
fe->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000;
fe->max_drift = fetunesettings.max_drift;
fe->step_size = fetunesettings.step_size;
} else {
// default values
switch(fe->info->type) {
case FE_QPSK:
fe->min_delay = HZ/20; // default mindelay of 50ms
fe->step_size = fe->parameters.u.qpsk.symbol_rate / 16000;
fe->max_drift = fe->parameters.u.qpsk.symbol_rate / 2000;
break;
case FE_QAM:
fe->min_delay = HZ/20; // default mindelay of 50ms
fe->step_size = 0;
fe->max_drift = 0; // don't want any zigzagging under DVB-C frontends
break;
case FE_OFDM:
fe->min_delay = HZ/20; // default mindelay of 50ms
fe->step_size = fe->info->frequency_stepsize * 2;
fe->max_drift = (fe->info->frequency_stepsize * 2) + 1;
break;
}
}
if (dvb_override_tune_delay > 0) {
fe->min_delay = (dvb_override_tune_delay * HZ) / 1000;
}
dvb_frontend_add_event (fe, 0);
break;
case FE_GET_EVENT:
err = dvb_frontend_get_event (fe, parg, file->f_flags);
break;
case FE_GET_FRONTEND:
memcpy (parg, &fe->parameters,
sizeof (struct dvb_frontend_parameters));
/* fall-through... */
default:
err = dvb_frontend_internal_ioctl (&fe->frontend, cmd, parg);
};
up (&fe->sem);
if (err < 0)
return err;
// Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't do it, it is done for it.
if ((cmd == FE_GET_INFO) && (err == 0)) {
struct dvb_frontend_info* tmp = (struct dvb_frontend_info*) parg;
tmp->caps |= FE_CAN_INVERSION_AUTO;
}
// if the frontend has just been set, wait until the first tune has finished.
// This ensures the app doesn't start reading data too quickly, perhaps from the
// previous lock, which is REALLY CONFUSING TO DEBUG!
if ((cmd == FE_SET_FRONTEND) && (err == 0)) {
dvb_frontend_wakeup(fe);
err = wait_event_interruptible(fe->wait_queue, fe->state & ~FESTATE_RETUNE);
}
return err;
}
static unsigned int dvb_frontend_poll (struct file *file, struct poll_table_struct *wait)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend_data *fe = dvbdev->priv;
dprintk ("%s\n", __FUNCTION__);
poll_wait (file, &fe->events.wait_queue, wait);
if (fe->events.eventw != fe->events.eventr)
return (POLLIN | POLLRDNORM | POLLPRI);
return 0;
}
static int dvb_frontend_open (struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend_data *fe = dvbdev->priv;
int ret;
dprintk ("%s\n", __FUNCTION__);
if ((ret = dvb_generic_open (inode, file)) < 0)
return ret;
if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
ret = dvb_frontend_start (fe);
if (ret)
dvb_generic_release (inode, file);
/* empty event queue */
fe->events.eventr = fe->events.eventw = 0;
}
return ret;
}
static int dvb_frontend_release (struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend_data *fe = dvbdev->priv;
dprintk ("%s\n", __FUNCTION__);
if ((file->f_flags & O_ACCMODE) != O_RDONLY)
fe->release_jiffies = jiffies;
return dvb_generic_release (inode, file);
}
int
dvb_add_frontend_ioctls (struct dvb_adapter *adapter,
int (*before_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg),
int (*after_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg),
void *before_after_data)
{
struct dvb_frontend_ioctl_data *ioctl;
struct list_head *entry;
dprintk ("%s\n", __FUNCTION__);
if (down_interruptible (&frontend_mutex))
return -ERESTARTSYS;
ioctl = kmalloc (sizeof(struct dvb_frontend_ioctl_data), GFP_KERNEL);
if (!ioctl) {
up (&frontend_mutex);
return -ENOMEM;
}
ioctl->adapter = adapter;
ioctl->before_ioctl = before_ioctl;
ioctl->after_ioctl = after_ioctl;
ioctl->before_after_data = before_after_data;
list_add_tail (&ioctl->list_head, &frontend_ioctl_list);
list_for_each (entry, &frontend_list) {
struct dvb_frontend_data *fe;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.i2c->adapter == adapter &&
fe->frontend.before_ioctl == NULL &&
fe->frontend.after_ioctl == NULL)
{
fe->frontend.before_ioctl = before_ioctl;
fe->frontend.after_ioctl = after_ioctl;
fe->frontend.before_after_data = before_after_data;
}
}
up (&frontend_mutex);
return 0;
}
void
dvb_remove_frontend_ioctls (struct dvb_adapter *adapter,
int (*before_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg),
int (*after_ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg))
{
struct list_head *entry, *n;
dprintk ("%s\n", __FUNCTION__);
down (&frontend_mutex);
list_for_each (entry, &frontend_list) {
struct dvb_frontend_data *fe;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.i2c->adapter == adapter &&
fe->frontend.before_ioctl == before_ioctl &&
fe->frontend.after_ioctl == after_ioctl)
{
fe->frontend.before_ioctl = NULL;
fe->frontend.after_ioctl = NULL;
}
}
list_for_each_safe (entry, n, &frontend_ioctl_list) {
struct dvb_frontend_ioctl_data *ioctl;
ioctl = list_entry (entry, struct dvb_frontend_ioctl_data, list_head);
if (ioctl->adapter == adapter &&
ioctl->before_ioctl == before_ioctl &&
ioctl->after_ioctl == after_ioctl)
{
list_del (&ioctl->list_head);
kfree (ioctl);
break;
}
}
up (&frontend_mutex);
}
int
dvb_add_frontend_notifier (struct dvb_adapter *adapter,
void (*callback) (fe_status_t s, void *data),
void *data)
{
struct dvb_frontend_notifier_data *notifier;
struct list_head *entry;
dprintk ("%s\n", __FUNCTION__);
if (down_interruptible (&frontend_mutex))
return -ERESTARTSYS;
notifier = kmalloc (sizeof(struct dvb_frontend_notifier_data), GFP_KERNEL);
if (!notifier) {
up (&frontend_mutex);
return -ENOMEM;
}
notifier->adapter = adapter;
notifier->callback = callback;
notifier->data = data;
list_add_tail (¬ifier->list_head, &frontend_notifier_list);
list_for_each (entry, &frontend_list) {
struct dvb_frontend_data *fe;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.i2c->adapter == adapter &&
fe->frontend.notifier_callback == NULL)
{
fe->frontend.notifier_callback = callback;
fe->frontend.notifier_data = data;
}
}
up (&frontend_mutex);
return 0;
}
void
dvb_remove_frontend_notifier (struct dvb_adapter *adapter,
void (*callback) (fe_status_t s, void *data))
{
struct list_head *entry, *n;
dprintk ("%s\n", __FUNCTION__);
down (&frontend_mutex);
list_for_each (entry, &frontend_list) {
struct dvb_frontend_data *fe;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.i2c->adapter == adapter &&
fe->frontend.notifier_callback == callback)
{
fe->frontend.notifier_callback = NULL;
}
}
list_for_each_safe (entry, n, &frontend_notifier_list) {
struct dvb_frontend_notifier_data *notifier;
notifier = list_entry (entry, struct dvb_frontend_notifier_data, list_head);
if (notifier->adapter == adapter &&
notifier->callback == callback)
{
list_del (¬ifier->list_head);
kfree (notifier);
break;
}
}
up (&frontend_mutex);
}
static struct file_operations dvb_frontend_fops = {
.owner = THIS_MODULE,
.ioctl = dvb_generic_ioctl,
.poll = dvb_frontend_poll,
.open = dvb_frontend_open,
.release = dvb_frontend_release
};
int
dvb_register_frontend (int (*ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg),
struct dvb_i2c_bus *i2c,
void *data,
struct dvb_frontend_info *info)
{
struct list_head *entry;
struct dvb_frontend_data *fe;
static const struct dvb_device dvbdev_template = {
.users = ~0,
.writers = 1,
.readers = (~0)-1,
.fops = &dvb_frontend_fops,
.kernel_ioctl = dvb_frontend_ioctl
};
dprintk ("%s\n", __FUNCTION__);
if (down_interruptible (&frontend_mutex))
return -ERESTARTSYS;
if (!(fe = kmalloc (sizeof (struct dvb_frontend_data), GFP_KERNEL))) {
up (&frontend_mutex);
return -ENOMEM;
}
memset (fe, 0, sizeof (struct dvb_frontend_data));
init_MUTEX (&fe->sem);
init_waitqueue_head (&fe->wait_queue);
init_waitqueue_head (&fe->events.wait_queue);
init_MUTEX (&fe->events.sem);
fe->events.eventw = fe->events.eventr = 0;
fe->events.overflow = 0;
fe->frontend.ioctl = ioctl;
fe->frontend.i2c = i2c;
fe->frontend.data = data;
fe->info = info;
fe->inversion = INVERSION_OFF;
list_for_each (entry, &frontend_ioctl_list) {
struct dvb_frontend_ioctl_data *ioctl;
ioctl = list_entry (entry,
struct dvb_frontend_ioctl_data,
list_head);
if (ioctl->adapter == i2c->adapter) {
fe->frontend.before_ioctl = ioctl->before_ioctl;
fe->frontend.after_ioctl = ioctl->after_ioctl;
fe->frontend.before_after_data = ioctl->before_after_data;
break;
}
}
list_for_each (entry, &frontend_notifier_list) {
struct dvb_frontend_notifier_data *notifier;
notifier = list_entry (entry,
struct dvb_frontend_notifier_data,
list_head);
if (notifier->adapter == i2c->adapter) {
fe->frontend.notifier_callback = notifier->callback;
fe->frontend.notifier_data = notifier->data;
break;
}
}
list_add_tail (&fe->list_head, &frontend_list);
printk ("DVB: registering frontend %i:%i (%s)...\n",
fe->frontend.i2c->adapter->num, fe->frontend.i2c->id,
fe->info->name);
dvb_register_device (i2c->adapter, &fe->dvbdev, &dvbdev_template,
fe, DVB_DEVICE_FRONTEND);
if ((info->caps & FE_NEEDS_BENDING) || (dvb_override_frequency_bending == 2))
do_frequency_bending = 1;
up (&frontend_mutex);
return 0;
}
int dvb_unregister_frontend (int (*ioctl) (struct dvb_frontend *frontend,
unsigned int cmd, void *arg),
struct dvb_i2c_bus *i2c)
{
struct list_head *entry, *n;
dprintk ("%s\n", __FUNCTION__);
down (&frontend_mutex);
list_for_each_safe (entry, n, &frontend_list) {
struct dvb_frontend_data *fe;
fe = list_entry (entry, struct dvb_frontend_data, list_head);
if (fe->frontend.ioctl == ioctl && fe->frontend.i2c == i2c) {
dvb_unregister_device (fe->dvbdev);
list_del (entry);
up (&frontend_mutex);
dvb_frontend_stop (fe);
kfree (fe);
return 0;
}
}
up (&frontend_mutex);
return -EINVAL;
}
MODULE_PARM(dvb_frontend_debug,"i");
MODULE_PARM(dvb_shutdown_timeout,"i");
MODULE_PARM(dvb_override_frequency_bending,"i");
MODULE_PARM(dvb_force_auto_inversion,"i");
MODULE_PARM(dvb_override_tune_delay,"i");
MODULE_PARM_DESC(dvb_frontend_debug, "enable verbose debug messages");
MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
MODULE_PARM_DESC(dvb_override_frequency_bending, "0: normal (default), 1: never use frequency bending, 2: always use frequency bending");
MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
![[BACK]](/icons/back.gif){kind=icon}
Return to dvb_frontend.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / linux-2.6-xfs / drivers / media / dvb / dvb-core