/*
* dvb_frontend.c: DVB frontend tuning interface/thread
*
*
* 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/moduleparam.h>
#include <linux/list.h>
#include <linux/suspend.h>
#include <linux/jiffies.h>
#include <asm/processor.h>
#include "dvb_frontend.h"
#include "dvbdev.h"
static int dvb_frontend_debug;
static int dvb_shutdown_timeout = 5;
static int dvb_force_auto_inversion;
static int dvb_override_tune_delay;
static int dvb_powerdown_on_sleep = 1;
module_param_named(frontend_debug, dvb_frontend_debug, int, 0644);
MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off).");
module_param(dvb_shutdown_timeout, int, 0644);
MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware");
module_param(dvb_force_auto_inversion, int, 0644);
MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always");
module_param(dvb_override_tune_delay, int, 0644);
MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt");
module_param(dvb_powerdown_on_sleep, int, 0644);
MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)");
#define dprintk if (dvb_frontend_debug) printk
#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)
#define FE_ALGO_HW 1
/*
* 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 DEFINE_MUTEX(frontend_mutex);
struct dvb_frontend_private {
/* thread/frontend values */
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;
unsigned int exit;
unsigned int wakeup;
fe_status_t status;
unsigned long tune_mode_flags;
unsigned int delay;
unsigned int reinitialise;
int tone;
int voltage;
/* swzigzag values */
unsigned int state;
unsigned int bending;
int lnb_drift;
unsigned int inversion;
unsigned int auto_step;
unsigned int auto_sub_step;
unsigned int started_auto_step;
unsigned int min_delay;
unsigned int max_drift;
unsigned int step_size;
int quality;
unsigned int check_wrapped;
};
static void dvb_frontend_wakeup(struct dvb_frontend *fe);
static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
{
struct dvb_frontend_private *fepriv = fe->frontend_priv;
struct dvb_fe_events *events = &fepriv->events;
struct dvb_frontend_event *e;
int